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![Linus Torvalds](/assets/img/avatar_default.png)
-----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE8rQSAMVO+zA4DBdWxWXV+ddtWDsFAlosIf4ACgkQxWXV+ddt WDspsw//YPhztOkAM7L37Lcv6PuMIBm7AsZax+iUctx9GlE9Yb9dYX+yIGjk3N44 M6oHANP/Af70lGn3jaNlH+BeQre+RFD2KnT+Yyvp/0DV5+v+Bb6wqzrVqeYf9NIr lf6yc925gX10+DM6UXpYopTmdB8zXXO8xnqmFuT1jC/PrW/g+Hpxi7UtFFcoXwnE uucdih1LnNC/2pwp4ygQAxMkLnU2foWRsEP9lqsv83ecKDBfVxHUidzEZLTO7L+c ePc74AcyuPZ7DobuSDyDF4e0Ru5YtY5Zf+KR7RZHag5BNF2YLJE/XtN+hd3YhOQA 7VniaPzUEG74ukvkL3L2oqxrMEavE0IFJtmzT4CM8DlRsGsDnn5n45sGHfo5clr8 33XOq8aiGtbG1vwVbBJOuNQI2SWJxwe1OyAZoV/o1UVrltSCRf+dYL8Yf3IO2K0M DRnRNqEcZQGfqrVO5Iblw7VzVqY9LKiRESScS0Btvrys+DTVZAgC9CJDwN446E5v i56PrmT8OcC9MzP9wFIZtg27jiC0ndNwkqUhFrt1LBvC+BtvZvshAnFLhLfSRyZo 0gqp2GoP6CFaUd5Ok+osALWF2VG8cpMJ7urdX0O5zXEYKioLwiXUS9Z7sldfHsJr Uiy1uh70UIOM96ZcsXyjLr0LO5vmgkV2kyDNbR5DtrJhfFai4Gs= =YaZE -----END PGP SIGNATURE----- Merge tag 'for-4.15-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux Pull btrfs fixes from David Sterba: "This contains a few fixes (error handling, quota leak, FUA vs nobarrier mount option). There's one one worth mentioning separately - an off-by-one fix that leads to overwriting first byte of an adjacent page with 0, out of bounds of the memory allocated by an ioctl. This is under a privileged part of the ioctl, can be triggerd in some subvolume layouts" * tag 'for-4.15-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: btrfs: Fix possible off-by-one in btrfs_search_path_in_tree Btrfs: disable FUA if mounted with nobarrier btrfs: fix missing error return in btrfs_drop_snapshot btrfs: handle errors while updating refcounts in update_ref_for_cow btrfs: Fix quota reservation leak on preallocated files
11060 lines
300 KiB
C
11060 lines
300 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/sort.h>
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#include <linux/rcupdate.h>
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/ratelimit.h>
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#include <linux/percpu_counter.h>
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#include <linux/lockdep.h>
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#include "hash.h"
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#include "tree-log.h"
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#include "disk-io.h"
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#include "print-tree.h"
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#include "volumes.h"
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#include "raid56.h"
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#include "locking.h"
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#include "free-space-cache.h"
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#include "free-space-tree.h"
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#include "math.h"
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#include "sysfs.h"
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#include "qgroup.h"
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#include "ref-verify.h"
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#undef SCRAMBLE_DELAYED_REFS
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/*
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* control flags for do_chunk_alloc's force field
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* CHUNK_ALLOC_NO_FORCE means to only allocate a chunk
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* if we really need one.
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*
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* CHUNK_ALLOC_LIMITED means to only try and allocate one
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* if we have very few chunks already allocated. This is
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* used as part of the clustering code to help make sure
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* we have a good pool of storage to cluster in, without
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* filling the FS with empty chunks
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*
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* CHUNK_ALLOC_FORCE means it must try to allocate one
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*
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*/
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enum {
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CHUNK_ALLOC_NO_FORCE = 0,
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CHUNK_ALLOC_LIMITED = 1,
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CHUNK_ALLOC_FORCE = 2,
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};
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static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_delayed_ref_node *node, u64 parent,
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u64 root_objectid, u64 owner_objectid,
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u64 owner_offset, int refs_to_drop,
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struct btrfs_delayed_extent_op *extra_op);
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static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op,
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struct extent_buffer *leaf,
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struct btrfs_extent_item *ei);
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static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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u64 parent, u64 root_objectid,
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u64 flags, u64 owner, u64 offset,
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struct btrfs_key *ins, int ref_mod);
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static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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u64 parent, u64 root_objectid,
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u64 flags, struct btrfs_disk_key *key,
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int level, struct btrfs_key *ins);
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static int do_chunk_alloc(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 flags,
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int force);
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static int find_next_key(struct btrfs_path *path, int level,
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struct btrfs_key *key);
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static void dump_space_info(struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *info, u64 bytes,
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int dump_block_groups);
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static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
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u64 num_bytes);
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static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *space_info,
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u64 num_bytes);
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static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
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struct btrfs_space_info *space_info,
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u64 num_bytes);
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static noinline int
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block_group_cache_done(struct btrfs_block_group_cache *cache)
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{
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smp_mb();
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return cache->cached == BTRFS_CACHE_FINISHED ||
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cache->cached == BTRFS_CACHE_ERROR;
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}
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static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits)
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{
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return (cache->flags & bits) == bits;
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}
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void btrfs_get_block_group(struct btrfs_block_group_cache *cache)
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{
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atomic_inc(&cache->count);
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}
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void btrfs_put_block_group(struct btrfs_block_group_cache *cache)
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{
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if (atomic_dec_and_test(&cache->count)) {
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WARN_ON(cache->pinned > 0);
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WARN_ON(cache->reserved > 0);
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/*
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* If not empty, someone is still holding mutex of
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* full_stripe_lock, which can only be released by caller.
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* And it will definitely cause use-after-free when caller
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* tries to release full stripe lock.
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*
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* No better way to resolve, but only to warn.
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*/
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WARN_ON(!RB_EMPTY_ROOT(&cache->full_stripe_locks_root.root));
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kfree(cache->free_space_ctl);
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kfree(cache);
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}
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}
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/*
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* this adds the block group to the fs_info rb tree for the block group
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* cache
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*/
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static int btrfs_add_block_group_cache(struct btrfs_fs_info *info,
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struct btrfs_block_group_cache *block_group)
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{
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struct rb_node **p;
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struct rb_node *parent = NULL;
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struct btrfs_block_group_cache *cache;
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spin_lock(&info->block_group_cache_lock);
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p = &info->block_group_cache_tree.rb_node;
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while (*p) {
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parent = *p;
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cache = rb_entry(parent, struct btrfs_block_group_cache,
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cache_node);
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if (block_group->key.objectid < cache->key.objectid) {
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p = &(*p)->rb_left;
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} else if (block_group->key.objectid > cache->key.objectid) {
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p = &(*p)->rb_right;
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} else {
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spin_unlock(&info->block_group_cache_lock);
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return -EEXIST;
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}
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}
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rb_link_node(&block_group->cache_node, parent, p);
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rb_insert_color(&block_group->cache_node,
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&info->block_group_cache_tree);
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if (info->first_logical_byte > block_group->key.objectid)
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info->first_logical_byte = block_group->key.objectid;
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spin_unlock(&info->block_group_cache_lock);
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return 0;
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}
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/*
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* This will return the block group at or after bytenr if contains is 0, else
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* it will return the block group that contains the bytenr
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*/
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static struct btrfs_block_group_cache *
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block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr,
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int contains)
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{
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struct btrfs_block_group_cache *cache, *ret = NULL;
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struct rb_node *n;
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u64 end, start;
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spin_lock(&info->block_group_cache_lock);
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n = info->block_group_cache_tree.rb_node;
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while (n) {
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cache = rb_entry(n, struct btrfs_block_group_cache,
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cache_node);
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end = cache->key.objectid + cache->key.offset - 1;
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start = cache->key.objectid;
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if (bytenr < start) {
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if (!contains && (!ret || start < ret->key.objectid))
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ret = cache;
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n = n->rb_left;
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} else if (bytenr > start) {
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if (contains && bytenr <= end) {
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ret = cache;
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break;
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}
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n = n->rb_right;
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} else {
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ret = cache;
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break;
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}
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}
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if (ret) {
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btrfs_get_block_group(ret);
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if (bytenr == 0 && info->first_logical_byte > ret->key.objectid)
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info->first_logical_byte = ret->key.objectid;
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}
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spin_unlock(&info->block_group_cache_lock);
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return ret;
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}
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static int add_excluded_extent(struct btrfs_fs_info *fs_info,
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u64 start, u64 num_bytes)
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{
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u64 end = start + num_bytes - 1;
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set_extent_bits(&fs_info->freed_extents[0],
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start, end, EXTENT_UPTODATE);
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set_extent_bits(&fs_info->freed_extents[1],
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start, end, EXTENT_UPTODATE);
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return 0;
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}
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static void free_excluded_extents(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *cache)
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{
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u64 start, end;
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start = cache->key.objectid;
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end = start + cache->key.offset - 1;
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clear_extent_bits(&fs_info->freed_extents[0],
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start, end, EXTENT_UPTODATE);
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clear_extent_bits(&fs_info->freed_extents[1],
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start, end, EXTENT_UPTODATE);
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}
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static int exclude_super_stripes(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *cache)
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{
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u64 bytenr;
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u64 *logical;
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int stripe_len;
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int i, nr, ret;
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if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) {
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stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid;
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cache->bytes_super += stripe_len;
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ret = add_excluded_extent(fs_info, cache->key.objectid,
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stripe_len);
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if (ret)
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return ret;
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}
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for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
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bytenr = btrfs_sb_offset(i);
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ret = btrfs_rmap_block(fs_info, cache->key.objectid,
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bytenr, 0, &logical, &nr, &stripe_len);
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if (ret)
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return ret;
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while (nr--) {
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u64 start, len;
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if (logical[nr] > cache->key.objectid +
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cache->key.offset)
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continue;
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if (logical[nr] + stripe_len <= cache->key.objectid)
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continue;
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start = logical[nr];
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if (start < cache->key.objectid) {
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start = cache->key.objectid;
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len = (logical[nr] + stripe_len) - start;
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} else {
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len = min_t(u64, stripe_len,
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cache->key.objectid +
|
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cache->key.offset - start);
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}
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cache->bytes_super += len;
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ret = add_excluded_extent(fs_info, start, len);
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if (ret) {
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kfree(logical);
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return ret;
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}
|
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}
|
|
|
|
kfree(logical);
|
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}
|
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return 0;
|
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}
|
|
|
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static struct btrfs_caching_control *
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get_caching_control(struct btrfs_block_group_cache *cache)
|
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{
|
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struct btrfs_caching_control *ctl;
|
|
|
|
spin_lock(&cache->lock);
|
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if (!cache->caching_ctl) {
|
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spin_unlock(&cache->lock);
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return NULL;
|
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}
|
|
|
|
ctl = cache->caching_ctl;
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refcount_inc(&ctl->count);
|
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spin_unlock(&cache->lock);
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return ctl;
|
|
}
|
|
|
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static void put_caching_control(struct btrfs_caching_control *ctl)
|
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{
|
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if (refcount_dec_and_test(&ctl->count))
|
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kfree(ctl);
|
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}
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
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static void fragment_free_space(struct btrfs_block_group_cache *block_group)
|
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{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
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u64 start = block_group->key.objectid;
|
|
u64 len = block_group->key.offset;
|
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u64 chunk = block_group->flags & BTRFS_BLOCK_GROUP_METADATA ?
|
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fs_info->nodesize : fs_info->sectorsize;
|
|
u64 step = chunk << 1;
|
|
|
|
while (len > chunk) {
|
|
btrfs_remove_free_space(block_group, start, chunk);
|
|
start += step;
|
|
if (len < step)
|
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len = 0;
|
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else
|
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len -= step;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* this is only called by cache_block_group, since we could have freed extents
|
|
* we need to check the pinned_extents for any extents that can't be used yet
|
|
* since their free space will be released as soon as the transaction commits.
|
|
*/
|
|
u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
|
|
struct btrfs_fs_info *info, u64 start, u64 end)
|
|
{
|
|
u64 extent_start, extent_end, size, total_added = 0;
|
|
int ret;
|
|
|
|
while (start < end) {
|
|
ret = find_first_extent_bit(info->pinned_extents, start,
|
|
&extent_start, &extent_end,
|
|
EXTENT_DIRTY | EXTENT_UPTODATE,
|
|
NULL);
|
|
if (ret)
|
|
break;
|
|
|
|
if (extent_start <= start) {
|
|
start = extent_end + 1;
|
|
} else if (extent_start > start && extent_start < end) {
|
|
size = extent_start - start;
|
|
total_added += size;
|
|
ret = btrfs_add_free_space(block_group, start,
|
|
size);
|
|
BUG_ON(ret); /* -ENOMEM or logic error */
|
|
start = extent_end + 1;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (start < end) {
|
|
size = end - start;
|
|
total_added += size;
|
|
ret = btrfs_add_free_space(block_group, start, size);
|
|
BUG_ON(ret); /* -ENOMEM or logic error */
|
|
}
|
|
|
|
return total_added;
|
|
}
|
|
|
|
static int load_extent_tree_free(struct btrfs_caching_control *caching_ctl)
|
|
{
|
|
struct btrfs_block_group_cache *block_group = caching_ctl->block_group;
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_root *extent_root = fs_info->extent_root;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
u64 total_found = 0;
|
|
u64 last = 0;
|
|
u32 nritems;
|
|
int ret;
|
|
bool wakeup = true;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET);
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
/*
|
|
* If we're fragmenting we don't want to make anybody think we can
|
|
* allocate from this block group until we've had a chance to fragment
|
|
* the free space.
|
|
*/
|
|
if (btrfs_should_fragment_free_space(block_group))
|
|
wakeup = false;
|
|
#endif
|
|
/*
|
|
* We don't want to deadlock with somebody trying to allocate a new
|
|
* extent for the extent root while also trying to search the extent
|
|
* root to add free space. So we skip locking and search the commit
|
|
* root, since its read-only
|
|
*/
|
|
path->skip_locking = 1;
|
|
path->search_commit_root = 1;
|
|
path->reada = READA_FORWARD;
|
|
|
|
key.objectid = last;
|
|
key.offset = 0;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
|
|
next:
|
|
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
nritems = btrfs_header_nritems(leaf);
|
|
|
|
while (1) {
|
|
if (btrfs_fs_closing(fs_info) > 1) {
|
|
last = (u64)-1;
|
|
break;
|
|
}
|
|
|
|
if (path->slots[0] < nritems) {
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
} else {
|
|
ret = find_next_key(path, 0, &key);
|
|
if (ret)
|
|
break;
|
|
|
|
if (need_resched() ||
|
|
rwsem_is_contended(&fs_info->commit_root_sem)) {
|
|
if (wakeup)
|
|
caching_ctl->progress = last;
|
|
btrfs_release_path(path);
|
|
up_read(&fs_info->commit_root_sem);
|
|
mutex_unlock(&caching_ctl->mutex);
|
|
cond_resched();
|
|
mutex_lock(&caching_ctl->mutex);
|
|
down_read(&fs_info->commit_root_sem);
|
|
goto next;
|
|
}
|
|
|
|
ret = btrfs_next_leaf(extent_root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
break;
|
|
leaf = path->nodes[0];
|
|
nritems = btrfs_header_nritems(leaf);
|
|
continue;
|
|
}
|
|
|
|
if (key.objectid < last) {
|
|
key.objectid = last;
|
|
key.offset = 0;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
|
|
if (wakeup)
|
|
caching_ctl->progress = last;
|
|
btrfs_release_path(path);
|
|
goto next;
|
|
}
|
|
|
|
if (key.objectid < block_group->key.objectid) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
|
|
if (key.objectid >= block_group->key.objectid +
|
|
block_group->key.offset)
|
|
break;
|
|
|
|
if (key.type == BTRFS_EXTENT_ITEM_KEY ||
|
|
key.type == BTRFS_METADATA_ITEM_KEY) {
|
|
total_found += add_new_free_space(block_group,
|
|
fs_info, last,
|
|
key.objectid);
|
|
if (key.type == BTRFS_METADATA_ITEM_KEY)
|
|
last = key.objectid +
|
|
fs_info->nodesize;
|
|
else
|
|
last = key.objectid + key.offset;
|
|
|
|
if (total_found > CACHING_CTL_WAKE_UP) {
|
|
total_found = 0;
|
|
if (wakeup)
|
|
wake_up(&caching_ctl->wait);
|
|
}
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
ret = 0;
|
|
|
|
total_found += add_new_free_space(block_group, fs_info, last,
|
|
block_group->key.objectid +
|
|
block_group->key.offset);
|
|
caching_ctl->progress = (u64)-1;
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static noinline void caching_thread(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_caching_control *caching_ctl;
|
|
struct btrfs_root *extent_root;
|
|
int ret;
|
|
|
|
caching_ctl = container_of(work, struct btrfs_caching_control, work);
|
|
block_group = caching_ctl->block_group;
|
|
fs_info = block_group->fs_info;
|
|
extent_root = fs_info->extent_root;
|
|
|
|
mutex_lock(&caching_ctl->mutex);
|
|
down_read(&fs_info->commit_root_sem);
|
|
|
|
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE))
|
|
ret = load_free_space_tree(caching_ctl);
|
|
else
|
|
ret = load_extent_tree_free(caching_ctl);
|
|
|
|
spin_lock(&block_group->lock);
|
|
block_group->caching_ctl = NULL;
|
|
block_group->cached = ret ? BTRFS_CACHE_ERROR : BTRFS_CACHE_FINISHED;
|
|
spin_unlock(&block_group->lock);
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
if (btrfs_should_fragment_free_space(block_group)) {
|
|
u64 bytes_used;
|
|
|
|
spin_lock(&block_group->space_info->lock);
|
|
spin_lock(&block_group->lock);
|
|
bytes_used = block_group->key.offset -
|
|
btrfs_block_group_used(&block_group->item);
|
|
block_group->space_info->bytes_used += bytes_used >> 1;
|
|
spin_unlock(&block_group->lock);
|
|
spin_unlock(&block_group->space_info->lock);
|
|
fragment_free_space(block_group);
|
|
}
|
|
#endif
|
|
|
|
caching_ctl->progress = (u64)-1;
|
|
|
|
up_read(&fs_info->commit_root_sem);
|
|
free_excluded_extents(fs_info, block_group);
|
|
mutex_unlock(&caching_ctl->mutex);
|
|
|
|
wake_up(&caching_ctl->wait);
|
|
|
|
put_caching_control(caching_ctl);
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
|
|
static int cache_block_group(struct btrfs_block_group_cache *cache,
|
|
int load_cache_only)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
struct btrfs_fs_info *fs_info = cache->fs_info;
|
|
struct btrfs_caching_control *caching_ctl;
|
|
int ret = 0;
|
|
|
|
caching_ctl = kzalloc(sizeof(*caching_ctl), GFP_NOFS);
|
|
if (!caching_ctl)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&caching_ctl->list);
|
|
mutex_init(&caching_ctl->mutex);
|
|
init_waitqueue_head(&caching_ctl->wait);
|
|
caching_ctl->block_group = cache;
|
|
caching_ctl->progress = cache->key.objectid;
|
|
refcount_set(&caching_ctl->count, 1);
|
|
btrfs_init_work(&caching_ctl->work, btrfs_cache_helper,
|
|
caching_thread, NULL, NULL);
|
|
|
|
spin_lock(&cache->lock);
|
|
/*
|
|
* This should be a rare occasion, but this could happen I think in the
|
|
* case where one thread starts to load the space cache info, and then
|
|
* some other thread starts a transaction commit which tries to do an
|
|
* allocation while the other thread is still loading the space cache
|
|
* info. The previous loop should have kept us from choosing this block
|
|
* group, but if we've moved to the state where we will wait on caching
|
|
* block groups we need to first check if we're doing a fast load here,
|
|
* so we can wait for it to finish, otherwise we could end up allocating
|
|
* from a block group who's cache gets evicted for one reason or
|
|
* another.
|
|
*/
|
|
while (cache->cached == BTRFS_CACHE_FAST) {
|
|
struct btrfs_caching_control *ctl;
|
|
|
|
ctl = cache->caching_ctl;
|
|
refcount_inc(&ctl->count);
|
|
prepare_to_wait(&ctl->wait, &wait, TASK_UNINTERRUPTIBLE);
|
|
spin_unlock(&cache->lock);
|
|
|
|
schedule();
|
|
|
|
finish_wait(&ctl->wait, &wait);
|
|
put_caching_control(ctl);
|
|
spin_lock(&cache->lock);
|
|
}
|
|
|
|
if (cache->cached != BTRFS_CACHE_NO) {
|
|
spin_unlock(&cache->lock);
|
|
kfree(caching_ctl);
|
|
return 0;
|
|
}
|
|
WARN_ON(cache->caching_ctl);
|
|
cache->caching_ctl = caching_ctl;
|
|
cache->cached = BTRFS_CACHE_FAST;
|
|
spin_unlock(&cache->lock);
|
|
|
|
if (btrfs_test_opt(fs_info, SPACE_CACHE)) {
|
|
mutex_lock(&caching_ctl->mutex);
|
|
ret = load_free_space_cache(fs_info, cache);
|
|
|
|
spin_lock(&cache->lock);
|
|
if (ret == 1) {
|
|
cache->caching_ctl = NULL;
|
|
cache->cached = BTRFS_CACHE_FINISHED;
|
|
cache->last_byte_to_unpin = (u64)-1;
|
|
caching_ctl->progress = (u64)-1;
|
|
} else {
|
|
if (load_cache_only) {
|
|
cache->caching_ctl = NULL;
|
|
cache->cached = BTRFS_CACHE_NO;
|
|
} else {
|
|
cache->cached = BTRFS_CACHE_STARTED;
|
|
cache->has_caching_ctl = 1;
|
|
}
|
|
}
|
|
spin_unlock(&cache->lock);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
if (ret == 1 &&
|
|
btrfs_should_fragment_free_space(cache)) {
|
|
u64 bytes_used;
|
|
|
|
spin_lock(&cache->space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
bytes_used = cache->key.offset -
|
|
btrfs_block_group_used(&cache->item);
|
|
cache->space_info->bytes_used += bytes_used >> 1;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
fragment_free_space(cache);
|
|
}
|
|
#endif
|
|
mutex_unlock(&caching_ctl->mutex);
|
|
|
|
wake_up(&caching_ctl->wait);
|
|
if (ret == 1) {
|
|
put_caching_control(caching_ctl);
|
|
free_excluded_extents(fs_info, cache);
|
|
return 0;
|
|
}
|
|
} else {
|
|
/*
|
|
* We're either using the free space tree or no caching at all.
|
|
* Set cached to the appropriate value and wakeup any waiters.
|
|
*/
|
|
spin_lock(&cache->lock);
|
|
if (load_cache_only) {
|
|
cache->caching_ctl = NULL;
|
|
cache->cached = BTRFS_CACHE_NO;
|
|
} else {
|
|
cache->cached = BTRFS_CACHE_STARTED;
|
|
cache->has_caching_ctl = 1;
|
|
}
|
|
spin_unlock(&cache->lock);
|
|
wake_up(&caching_ctl->wait);
|
|
}
|
|
|
|
if (load_cache_only) {
|
|
put_caching_control(caching_ctl);
|
|
return 0;
|
|
}
|
|
|
|
down_write(&fs_info->commit_root_sem);
|
|
refcount_inc(&caching_ctl->count);
|
|
list_add_tail(&caching_ctl->list, &fs_info->caching_block_groups);
|
|
up_write(&fs_info->commit_root_sem);
|
|
|
|
btrfs_get_block_group(cache);
|
|
|
|
btrfs_queue_work(fs_info->caching_workers, &caching_ctl->work);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* return the block group that starts at or after bytenr
|
|
*/
|
|
static struct btrfs_block_group_cache *
|
|
btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr)
|
|
{
|
|
return block_group_cache_tree_search(info, bytenr, 0);
|
|
}
|
|
|
|
/*
|
|
* return the block group that contains the given bytenr
|
|
*/
|
|
struct btrfs_block_group_cache *btrfs_lookup_block_group(
|
|
struct btrfs_fs_info *info,
|
|
u64 bytenr)
|
|
{
|
|
return block_group_cache_tree_search(info, bytenr, 1);
|
|
}
|
|
|
|
static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
|
|
u64 flags)
|
|
{
|
|
struct list_head *head = &info->space_info;
|
|
struct btrfs_space_info *found;
|
|
|
|
flags &= BTRFS_BLOCK_GROUP_TYPE_MASK;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(found, head, list) {
|
|
if (found->flags & flags) {
|
|
rcu_read_unlock();
|
|
return found;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return NULL;
|
|
}
|
|
|
|
static void add_pinned_bytes(struct btrfs_fs_info *fs_info, s64 num_bytes,
|
|
u64 owner, u64 root_objectid)
|
|
{
|
|
struct btrfs_space_info *space_info;
|
|
u64 flags;
|
|
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID)
|
|
flags = BTRFS_BLOCK_GROUP_SYSTEM;
|
|
else
|
|
flags = BTRFS_BLOCK_GROUP_METADATA;
|
|
} else {
|
|
flags = BTRFS_BLOCK_GROUP_DATA;
|
|
}
|
|
|
|
space_info = __find_space_info(fs_info, flags);
|
|
ASSERT(space_info);
|
|
percpu_counter_add(&space_info->total_bytes_pinned, num_bytes);
|
|
}
|
|
|
|
/*
|
|
* after adding space to the filesystem, we need to clear the full flags
|
|
* on all the space infos.
|
|
*/
|
|
void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
|
|
{
|
|
struct list_head *head = &info->space_info;
|
|
struct btrfs_space_info *found;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(found, head, list)
|
|
found->full = 0;
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* simple helper to search for an existing data extent at a given offset */
|
|
int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len)
|
|
{
|
|
int ret;
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = start;
|
|
key.offset = len;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
ret = btrfs_search_slot(NULL, fs_info->extent_root, &key, path, 0, 0);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper function to lookup reference count and flags of a tree block.
|
|
*
|
|
* the head node for delayed ref is used to store the sum of all the
|
|
* reference count modifications queued up in the rbtree. the head
|
|
* node may also store the extent flags to set. This way you can check
|
|
* to see what the reference count and extent flags would be if all of
|
|
* the delayed refs are not processed.
|
|
*/
|
|
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 bytenr,
|
|
u64 offset, int metadata, u64 *refs, u64 *flags)
|
|
{
|
|
struct btrfs_delayed_ref_head *head;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_path *path;
|
|
struct btrfs_extent_item *ei;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
u32 item_size;
|
|
u64 num_refs;
|
|
u64 extent_flags;
|
|
int ret;
|
|
|
|
/*
|
|
* If we don't have skinny metadata, don't bother doing anything
|
|
* different
|
|
*/
|
|
if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA)) {
|
|
offset = fs_info->nodesize;
|
|
metadata = 0;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (!trans) {
|
|
path->skip_locking = 1;
|
|
path->search_commit_root = 1;
|
|
}
|
|
|
|
search_again:
|
|
key.objectid = bytenr;
|
|
key.offset = offset;
|
|
if (metadata)
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
else
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
|
|
ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out_free;
|
|
|
|
if (ret > 0 && metadata && key.type == BTRFS_METADATA_ITEM_KEY) {
|
|
if (path->slots[0]) {
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key,
|
|
path->slots[0]);
|
|
if (key.objectid == bytenr &&
|
|
key.type == BTRFS_EXTENT_ITEM_KEY &&
|
|
key.offset == fs_info->nodesize)
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
if (ret == 0) {
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
if (item_size >= sizeof(*ei)) {
|
|
ei = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_item);
|
|
num_refs = btrfs_extent_refs(leaf, ei);
|
|
extent_flags = btrfs_extent_flags(leaf, ei);
|
|
} else {
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
struct btrfs_extent_item_v0 *ei0;
|
|
BUG_ON(item_size != sizeof(*ei0));
|
|
ei0 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_item_v0);
|
|
num_refs = btrfs_extent_refs_v0(leaf, ei0);
|
|
/* FIXME: this isn't correct for data */
|
|
extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
|
|
#else
|
|
BUG();
|
|
#endif
|
|
}
|
|
BUG_ON(num_refs == 0);
|
|
} else {
|
|
num_refs = 0;
|
|
extent_flags = 0;
|
|
ret = 0;
|
|
}
|
|
|
|
if (!trans)
|
|
goto out;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
spin_lock(&delayed_refs->lock);
|
|
head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
|
|
if (head) {
|
|
if (!mutex_trylock(&head->mutex)) {
|
|
refcount_inc(&head->refs);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* Mutex was contended, block until it's released and try
|
|
* again
|
|
*/
|
|
mutex_lock(&head->mutex);
|
|
mutex_unlock(&head->mutex);
|
|
btrfs_put_delayed_ref_head(head);
|
|
goto search_again;
|
|
}
|
|
spin_lock(&head->lock);
|
|
if (head->extent_op && head->extent_op->update_flags)
|
|
extent_flags |= head->extent_op->flags_to_set;
|
|
else
|
|
BUG_ON(num_refs == 0);
|
|
|
|
num_refs += head->ref_mod;
|
|
spin_unlock(&head->lock);
|
|
mutex_unlock(&head->mutex);
|
|
}
|
|
spin_unlock(&delayed_refs->lock);
|
|
out:
|
|
WARN_ON(num_refs == 0);
|
|
if (refs)
|
|
*refs = num_refs;
|
|
if (flags)
|
|
*flags = extent_flags;
|
|
out_free:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Back reference rules. Back refs have three main goals:
|
|
*
|
|
* 1) differentiate between all holders of references to an extent so that
|
|
* when a reference is dropped we can make sure it was a valid reference
|
|
* before freeing the extent.
|
|
*
|
|
* 2) Provide enough information to quickly find the holders of an extent
|
|
* if we notice a given block is corrupted or bad.
|
|
*
|
|
* 3) Make it easy to migrate blocks for FS shrinking or storage pool
|
|
* maintenance. This is actually the same as #2, but with a slightly
|
|
* different use case.
|
|
*
|
|
* There are two kinds of back refs. The implicit back refs is optimized
|
|
* for pointers in non-shared tree blocks. For a given pointer in a block,
|
|
* back refs of this kind provide information about the block's owner tree
|
|
* and the pointer's key. These information allow us to find the block by
|
|
* b-tree searching. The full back refs is for pointers in tree blocks not
|
|
* referenced by their owner trees. The location of tree block is recorded
|
|
* in the back refs. Actually the full back refs is generic, and can be
|
|
* used in all cases the implicit back refs is used. The major shortcoming
|
|
* of the full back refs is its overhead. Every time a tree block gets
|
|
* COWed, we have to update back refs entry for all pointers in it.
|
|
*
|
|
* For a newly allocated tree block, we use implicit back refs for
|
|
* pointers in it. This means most tree related operations only involve
|
|
* implicit back refs. For a tree block created in old transaction, the
|
|
* only way to drop a reference to it is COW it. So we can detect the
|
|
* event that tree block loses its owner tree's reference and do the
|
|
* back refs conversion.
|
|
*
|
|
* When a tree block is COWed through a tree, there are four cases:
|
|
*
|
|
* The reference count of the block is one and the tree is the block's
|
|
* owner tree. Nothing to do in this case.
|
|
*
|
|
* The reference count of the block is one and the tree is not the
|
|
* block's owner tree. In this case, full back refs is used for pointers
|
|
* in the block. Remove these full back refs, add implicit back refs for
|
|
* every pointers in the new block.
|
|
*
|
|
* The reference count of the block is greater than one and the tree is
|
|
* the block's owner tree. In this case, implicit back refs is used for
|
|
* pointers in the block. Add full back refs for every pointers in the
|
|
* block, increase lower level extents' reference counts. The original
|
|
* implicit back refs are entailed to the new block.
|
|
*
|
|
* The reference count of the block is greater than one and the tree is
|
|
* not the block's owner tree. Add implicit back refs for every pointer in
|
|
* the new block, increase lower level extents' reference count.
|
|
*
|
|
* Back Reference Key composing:
|
|
*
|
|
* The key objectid corresponds to the first byte in the extent,
|
|
* The key type is used to differentiate between types of back refs.
|
|
* There are different meanings of the key offset for different types
|
|
* of back refs.
|
|
*
|
|
* File extents can be referenced by:
|
|
*
|
|
* - multiple snapshots, subvolumes, or different generations in one subvol
|
|
* - different files inside a single subvolume
|
|
* - different offsets inside a file (bookend extents in file.c)
|
|
*
|
|
* The extent ref structure for the implicit back refs has fields for:
|
|
*
|
|
* - Objectid of the subvolume root
|
|
* - objectid of the file holding the reference
|
|
* - original offset in the file
|
|
* - how many bookend extents
|
|
*
|
|
* The key offset for the implicit back refs is hash of the first
|
|
* three fields.
|
|
*
|
|
* The extent ref structure for the full back refs has field for:
|
|
*
|
|
* - number of pointers in the tree leaf
|
|
*
|
|
* The key offset for the implicit back refs is the first byte of
|
|
* the tree leaf
|
|
*
|
|
* When a file extent is allocated, The implicit back refs is used.
|
|
* the fields are filled in:
|
|
*
|
|
* (root_key.objectid, inode objectid, offset in file, 1)
|
|
*
|
|
* When a file extent is removed file truncation, we find the
|
|
* corresponding implicit back refs and check the following fields:
|
|
*
|
|
* (btrfs_header_owner(leaf), inode objectid, offset in file)
|
|
*
|
|
* Btree extents can be referenced by:
|
|
*
|
|
* - Different subvolumes
|
|
*
|
|
* Both the implicit back refs and the full back refs for tree blocks
|
|
* only consist of key. The key offset for the implicit back refs is
|
|
* objectid of block's owner tree. The key offset for the full back refs
|
|
* is the first byte of parent block.
|
|
*
|
|
* When implicit back refs is used, information about the lowest key and
|
|
* level of the tree block are required. These information are stored in
|
|
* tree block info structure.
|
|
*/
|
|
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
static int convert_extent_item_v0(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 owner, u32 extra_size)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_extent_item *item;
|
|
struct btrfs_extent_item_v0 *ei0;
|
|
struct btrfs_extent_ref_v0 *ref0;
|
|
struct btrfs_tree_block_info *bi;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
u32 new_size = sizeof(*item);
|
|
u64 refs;
|
|
int ret;
|
|
|
|
leaf = path->nodes[0];
|
|
BUG_ON(btrfs_item_size_nr(leaf, path->slots[0]) != sizeof(*ei0));
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
ei0 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_item_v0);
|
|
refs = btrfs_extent_refs_v0(leaf, ei0);
|
|
|
|
if (owner == (u64)-1) {
|
|
while (1) {
|
|
if (path->slots[0] >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
return ret;
|
|
BUG_ON(ret > 0); /* Corruption */
|
|
leaf = path->nodes[0];
|
|
}
|
|
btrfs_item_key_to_cpu(leaf, &found_key,
|
|
path->slots[0]);
|
|
BUG_ON(key.objectid != found_key.objectid);
|
|
if (found_key.type != BTRFS_EXTENT_REF_V0_KEY) {
|
|
path->slots[0]++;
|
|
continue;
|
|
}
|
|
ref0 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_ref_v0);
|
|
owner = btrfs_ref_objectid_v0(leaf, ref0);
|
|
break;
|
|
}
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID)
|
|
new_size += sizeof(*bi);
|
|
|
|
new_size -= sizeof(*ei0);
|
|
ret = btrfs_search_slot(trans, root, &key, path,
|
|
new_size + extra_size, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
BUG_ON(ret); /* Corruption */
|
|
|
|
btrfs_extend_item(fs_info, path, new_size);
|
|
|
|
leaf = path->nodes[0];
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
btrfs_set_extent_refs(leaf, item, refs);
|
|
/* FIXME: get real generation */
|
|
btrfs_set_extent_generation(leaf, item, 0);
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
btrfs_set_extent_flags(leaf, item,
|
|
BTRFS_EXTENT_FLAG_TREE_BLOCK |
|
|
BTRFS_BLOCK_FLAG_FULL_BACKREF);
|
|
bi = (struct btrfs_tree_block_info *)(item + 1);
|
|
/* FIXME: get first key of the block */
|
|
memzero_extent_buffer(leaf, (unsigned long)bi, sizeof(*bi));
|
|
btrfs_set_tree_block_level(leaf, bi, (int)owner);
|
|
} else {
|
|
btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_DATA);
|
|
}
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* is_data == BTRFS_REF_TYPE_BLOCK, tree block type is required,
|
|
* is_data == BTRFS_REF_TYPE_DATA, data type is requried,
|
|
* is_data == BTRFS_REF_TYPE_ANY, either type is OK.
|
|
*/
|
|
int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb,
|
|
struct btrfs_extent_inline_ref *iref,
|
|
enum btrfs_inline_ref_type is_data)
|
|
{
|
|
int type = btrfs_extent_inline_ref_type(eb, iref);
|
|
u64 offset = btrfs_extent_inline_ref_offset(eb, iref);
|
|
|
|
if (type == BTRFS_TREE_BLOCK_REF_KEY ||
|
|
type == BTRFS_SHARED_BLOCK_REF_KEY ||
|
|
type == BTRFS_SHARED_DATA_REF_KEY ||
|
|
type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
if (is_data == BTRFS_REF_TYPE_BLOCK) {
|
|
if (type == BTRFS_TREE_BLOCK_REF_KEY)
|
|
return type;
|
|
if (type == BTRFS_SHARED_BLOCK_REF_KEY) {
|
|
ASSERT(eb->fs_info);
|
|
/*
|
|
* Every shared one has parent tree
|
|
* block, which must be aligned to
|
|
* nodesize.
|
|
*/
|
|
if (offset &&
|
|
IS_ALIGNED(offset, eb->fs_info->nodesize))
|
|
return type;
|
|
}
|
|
} else if (is_data == BTRFS_REF_TYPE_DATA) {
|
|
if (type == BTRFS_EXTENT_DATA_REF_KEY)
|
|
return type;
|
|
if (type == BTRFS_SHARED_DATA_REF_KEY) {
|
|
ASSERT(eb->fs_info);
|
|
/*
|
|
* Every shared one has parent tree
|
|
* block, which must be aligned to
|
|
* nodesize.
|
|
*/
|
|
if (offset &&
|
|
IS_ALIGNED(offset, eb->fs_info->nodesize))
|
|
return type;
|
|
}
|
|
} else {
|
|
ASSERT(is_data == BTRFS_REF_TYPE_ANY);
|
|
return type;
|
|
}
|
|
}
|
|
|
|
btrfs_print_leaf((struct extent_buffer *)eb);
|
|
btrfs_err(eb->fs_info, "eb %llu invalid extent inline ref type %d",
|
|
eb->start, type);
|
|
WARN_ON(1);
|
|
|
|
return BTRFS_REF_TYPE_INVALID;
|
|
}
|
|
|
|
static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset)
|
|
{
|
|
u32 high_crc = ~(u32)0;
|
|
u32 low_crc = ~(u32)0;
|
|
__le64 lenum;
|
|
|
|
lenum = cpu_to_le64(root_objectid);
|
|
high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum));
|
|
lenum = cpu_to_le64(owner);
|
|
low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
|
|
lenum = cpu_to_le64(offset);
|
|
low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum));
|
|
|
|
return ((u64)high_crc << 31) ^ (u64)low_crc;
|
|
}
|
|
|
|
static u64 hash_extent_data_ref_item(struct extent_buffer *leaf,
|
|
struct btrfs_extent_data_ref *ref)
|
|
{
|
|
return hash_extent_data_ref(btrfs_extent_data_ref_root(leaf, ref),
|
|
btrfs_extent_data_ref_objectid(leaf, ref),
|
|
btrfs_extent_data_ref_offset(leaf, ref));
|
|
}
|
|
|
|
static int match_extent_data_ref(struct extent_buffer *leaf,
|
|
struct btrfs_extent_data_ref *ref,
|
|
u64 root_objectid, u64 owner, u64 offset)
|
|
{
|
|
if (btrfs_extent_data_ref_root(leaf, ref) != root_objectid ||
|
|
btrfs_extent_data_ref_objectid(leaf, ref) != owner ||
|
|
btrfs_extent_data_ref_offset(leaf, ref) != offset)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static noinline int lookup_extent_data_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, u64 parent,
|
|
u64 root_objectid,
|
|
u64 owner, u64 offset)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_key key;
|
|
struct btrfs_extent_data_ref *ref;
|
|
struct extent_buffer *leaf;
|
|
u32 nritems;
|
|
int ret;
|
|
int recow;
|
|
int err = -ENOENT;
|
|
|
|
key.objectid = bytenr;
|
|
if (parent) {
|
|
key.type = BTRFS_SHARED_DATA_REF_KEY;
|
|
key.offset = parent;
|
|
} else {
|
|
key.type = BTRFS_EXTENT_DATA_REF_KEY;
|
|
key.offset = hash_extent_data_ref(root_objectid,
|
|
owner, offset);
|
|
}
|
|
again:
|
|
recow = 0;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
|
|
if (parent) {
|
|
if (!ret)
|
|
return 0;
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
key.type = BTRFS_EXTENT_REF_V0_KEY;
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
if (!ret)
|
|
return 0;
|
|
#endif
|
|
goto fail;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
nritems = btrfs_header_nritems(leaf);
|
|
while (1) {
|
|
if (path->slots[0] >= nritems) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret < 0)
|
|
err = ret;
|
|
if (ret)
|
|
goto fail;
|
|
|
|
leaf = path->nodes[0];
|
|
nritems = btrfs_header_nritems(leaf);
|
|
recow = 1;
|
|
}
|
|
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (key.objectid != bytenr ||
|
|
key.type != BTRFS_EXTENT_DATA_REF_KEY)
|
|
goto fail;
|
|
|
|
ref = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_data_ref);
|
|
|
|
if (match_extent_data_ref(leaf, ref, root_objectid,
|
|
owner, offset)) {
|
|
if (recow) {
|
|
btrfs_release_path(path);
|
|
goto again;
|
|
}
|
|
err = 0;
|
|
break;
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
fail:
|
|
return err;
|
|
}
|
|
|
|
static noinline int insert_extent_data_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, u64 parent,
|
|
u64 root_objectid, u64 owner,
|
|
u64 offset, int refs_to_add)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf;
|
|
u32 size;
|
|
u32 num_refs;
|
|
int ret;
|
|
|
|
key.objectid = bytenr;
|
|
if (parent) {
|
|
key.type = BTRFS_SHARED_DATA_REF_KEY;
|
|
key.offset = parent;
|
|
size = sizeof(struct btrfs_shared_data_ref);
|
|
} else {
|
|
key.type = BTRFS_EXTENT_DATA_REF_KEY;
|
|
key.offset = hash_extent_data_ref(root_objectid,
|
|
owner, offset);
|
|
size = sizeof(struct btrfs_extent_data_ref);
|
|
}
|
|
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key, size);
|
|
if (ret && ret != -EEXIST)
|
|
goto fail;
|
|
|
|
leaf = path->nodes[0];
|
|
if (parent) {
|
|
struct btrfs_shared_data_ref *ref;
|
|
ref = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_shared_data_ref);
|
|
if (ret == 0) {
|
|
btrfs_set_shared_data_ref_count(leaf, ref, refs_to_add);
|
|
} else {
|
|
num_refs = btrfs_shared_data_ref_count(leaf, ref);
|
|
num_refs += refs_to_add;
|
|
btrfs_set_shared_data_ref_count(leaf, ref, num_refs);
|
|
}
|
|
} else {
|
|
struct btrfs_extent_data_ref *ref;
|
|
while (ret == -EEXIST) {
|
|
ref = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_data_ref);
|
|
if (match_extent_data_ref(leaf, ref, root_objectid,
|
|
owner, offset))
|
|
break;
|
|
btrfs_release_path(path);
|
|
key.offset++;
|
|
ret = btrfs_insert_empty_item(trans, root, path, &key,
|
|
size);
|
|
if (ret && ret != -EEXIST)
|
|
goto fail;
|
|
|
|
leaf = path->nodes[0];
|
|
}
|
|
ref = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_data_ref);
|
|
if (ret == 0) {
|
|
btrfs_set_extent_data_ref_root(leaf, ref,
|
|
root_objectid);
|
|
btrfs_set_extent_data_ref_objectid(leaf, ref, owner);
|
|
btrfs_set_extent_data_ref_offset(leaf, ref, offset);
|
|
btrfs_set_extent_data_ref_count(leaf, ref, refs_to_add);
|
|
} else {
|
|
num_refs = btrfs_extent_data_ref_count(leaf, ref);
|
|
num_refs += refs_to_add;
|
|
btrfs_set_extent_data_ref_count(leaf, ref, num_refs);
|
|
}
|
|
}
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
ret = 0;
|
|
fail:
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
int refs_to_drop, int *last_ref)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_extent_data_ref *ref1 = NULL;
|
|
struct btrfs_shared_data_ref *ref2 = NULL;
|
|
struct extent_buffer *leaf;
|
|
u32 num_refs = 0;
|
|
int ret = 0;
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
|
|
if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
ref1 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_data_ref);
|
|
num_refs = btrfs_extent_data_ref_count(leaf, ref1);
|
|
} else if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
|
|
ref2 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_shared_data_ref);
|
|
num_refs = btrfs_shared_data_ref_count(leaf, ref2);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
|
|
struct btrfs_extent_ref_v0 *ref0;
|
|
ref0 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_ref_v0);
|
|
num_refs = btrfs_ref_count_v0(leaf, ref0);
|
|
#endif
|
|
} else {
|
|
BUG();
|
|
}
|
|
|
|
BUG_ON(num_refs < refs_to_drop);
|
|
num_refs -= refs_to_drop;
|
|
|
|
if (num_refs == 0) {
|
|
ret = btrfs_del_item(trans, fs_info->extent_root, path);
|
|
*last_ref = 1;
|
|
} else {
|
|
if (key.type == BTRFS_EXTENT_DATA_REF_KEY)
|
|
btrfs_set_extent_data_ref_count(leaf, ref1, num_refs);
|
|
else if (key.type == BTRFS_SHARED_DATA_REF_KEY)
|
|
btrfs_set_shared_data_ref_count(leaf, ref2, num_refs);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
else {
|
|
struct btrfs_extent_ref_v0 *ref0;
|
|
ref0 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_ref_v0);
|
|
btrfs_set_ref_count_v0(leaf, ref0, num_refs);
|
|
}
|
|
#endif
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static noinline u32 extent_data_ref_count(struct btrfs_path *path,
|
|
struct btrfs_extent_inline_ref *iref)
|
|
{
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_data_ref *ref1;
|
|
struct btrfs_shared_data_ref *ref2;
|
|
u32 num_refs = 0;
|
|
int type;
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
if (iref) {
|
|
/*
|
|
* If type is invalid, we should have bailed out earlier than
|
|
* this call.
|
|
*/
|
|
type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA);
|
|
ASSERT(type != BTRFS_REF_TYPE_INVALID);
|
|
if (type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
ref1 = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
num_refs = btrfs_extent_data_ref_count(leaf, ref1);
|
|
} else {
|
|
ref2 = (struct btrfs_shared_data_ref *)(iref + 1);
|
|
num_refs = btrfs_shared_data_ref_count(leaf, ref2);
|
|
}
|
|
} else if (key.type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
ref1 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_data_ref);
|
|
num_refs = btrfs_extent_data_ref_count(leaf, ref1);
|
|
} else if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
|
|
ref2 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_shared_data_ref);
|
|
num_refs = btrfs_shared_data_ref_count(leaf, ref2);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
|
|
struct btrfs_extent_ref_v0 *ref0;
|
|
ref0 = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_ref_v0);
|
|
num_refs = btrfs_ref_count_v0(leaf, ref0);
|
|
#endif
|
|
} else {
|
|
WARN_ON(1);
|
|
}
|
|
return num_refs;
|
|
}
|
|
|
|
static noinline int lookup_tree_block_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, u64 parent,
|
|
u64 root_objectid)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
key.objectid = bytenr;
|
|
if (parent) {
|
|
key.type = BTRFS_SHARED_BLOCK_REF_KEY;
|
|
key.offset = parent;
|
|
} else {
|
|
key.type = BTRFS_TREE_BLOCK_REF_KEY;
|
|
key.offset = root_objectid;
|
|
}
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
if (ret == -ENOENT && parent) {
|
|
btrfs_release_path(path);
|
|
key.type = BTRFS_EXTENT_REF_V0_KEY;
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
}
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static noinline int insert_tree_block_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, u64 parent,
|
|
u64 root_objectid)
|
|
{
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
key.objectid = bytenr;
|
|
if (parent) {
|
|
key.type = BTRFS_SHARED_BLOCK_REF_KEY;
|
|
key.offset = parent;
|
|
} else {
|
|
key.type = BTRFS_TREE_BLOCK_REF_KEY;
|
|
key.offset = root_objectid;
|
|
}
|
|
|
|
ret = btrfs_insert_empty_item(trans, fs_info->extent_root,
|
|
path, &key, 0);
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static inline int extent_ref_type(u64 parent, u64 owner)
|
|
{
|
|
int type;
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
if (parent > 0)
|
|
type = BTRFS_SHARED_BLOCK_REF_KEY;
|
|
else
|
|
type = BTRFS_TREE_BLOCK_REF_KEY;
|
|
} else {
|
|
if (parent > 0)
|
|
type = BTRFS_SHARED_DATA_REF_KEY;
|
|
else
|
|
type = BTRFS_EXTENT_DATA_REF_KEY;
|
|
}
|
|
return type;
|
|
}
|
|
|
|
static int find_next_key(struct btrfs_path *path, int level,
|
|
struct btrfs_key *key)
|
|
|
|
{
|
|
for (; level < BTRFS_MAX_LEVEL; level++) {
|
|
if (!path->nodes[level])
|
|
break;
|
|
if (path->slots[level] + 1 >=
|
|
btrfs_header_nritems(path->nodes[level]))
|
|
continue;
|
|
if (level == 0)
|
|
btrfs_item_key_to_cpu(path->nodes[level], key,
|
|
path->slots[level] + 1);
|
|
else
|
|
btrfs_node_key_to_cpu(path->nodes[level], key,
|
|
path->slots[level] + 1);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* look for inline back ref. if back ref is found, *ref_ret is set
|
|
* to the address of inline back ref, and 0 is returned.
|
|
*
|
|
* if back ref isn't found, *ref_ret is set to the address where it
|
|
* should be inserted, and -ENOENT is returned.
|
|
*
|
|
* if insert is true and there are too many inline back refs, the path
|
|
* points to the extent item, and -EAGAIN is returned.
|
|
*
|
|
* NOTE: inline back refs are ordered in the same way that back ref
|
|
* items in the tree are ordered.
|
|
*/
|
|
static noinline_for_stack
|
|
int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_extent_inline_ref **ref_ret,
|
|
u64 bytenr, u64 num_bytes,
|
|
u64 parent, u64 root_objectid,
|
|
u64 owner, u64 offset, int insert)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_item *ei;
|
|
struct btrfs_extent_inline_ref *iref;
|
|
u64 flags;
|
|
u64 item_size;
|
|
unsigned long ptr;
|
|
unsigned long end;
|
|
int extra_size;
|
|
int type;
|
|
int want;
|
|
int ret;
|
|
int err = 0;
|
|
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
|
|
int needed;
|
|
|
|
key.objectid = bytenr;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = num_bytes;
|
|
|
|
want = extent_ref_type(parent, owner);
|
|
if (insert) {
|
|
extra_size = btrfs_extent_inline_ref_size(want);
|
|
path->keep_locks = 1;
|
|
} else
|
|
extra_size = -1;
|
|
|
|
/*
|
|
* Owner is our parent level, so we can just add one to get the level
|
|
* for the block we are interested in.
|
|
*/
|
|
if (skinny_metadata && owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
key.offset = owner;
|
|
}
|
|
|
|
again:
|
|
ret = btrfs_search_slot(trans, root, &key, path, extra_size, 1);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We may be a newly converted file system which still has the old fat
|
|
* extent entries for metadata, so try and see if we have one of those.
|
|
*/
|
|
if (ret > 0 && skinny_metadata) {
|
|
skinny_metadata = false;
|
|
if (path->slots[0]) {
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key,
|
|
path->slots[0]);
|
|
if (key.objectid == bytenr &&
|
|
key.type == BTRFS_EXTENT_ITEM_KEY &&
|
|
key.offset == num_bytes)
|
|
ret = 0;
|
|
}
|
|
if (ret) {
|
|
key.objectid = bytenr;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = num_bytes;
|
|
btrfs_release_path(path);
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
if (ret && !insert) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
} else if (WARN_ON(ret)) {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
if (item_size < sizeof(*ei)) {
|
|
if (!insert) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
ret = convert_extent_item_v0(trans, fs_info, path, owner,
|
|
extra_size);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
}
|
|
#endif
|
|
BUG_ON(item_size < sizeof(*ei));
|
|
|
|
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
flags = btrfs_extent_flags(leaf, ei);
|
|
|
|
ptr = (unsigned long)(ei + 1);
|
|
end = (unsigned long)ei + item_size;
|
|
|
|
if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !skinny_metadata) {
|
|
ptr += sizeof(struct btrfs_tree_block_info);
|
|
BUG_ON(ptr > end);
|
|
}
|
|
|
|
if (owner >= BTRFS_FIRST_FREE_OBJECTID)
|
|
needed = BTRFS_REF_TYPE_DATA;
|
|
else
|
|
needed = BTRFS_REF_TYPE_BLOCK;
|
|
|
|
err = -ENOENT;
|
|
while (1) {
|
|
if (ptr >= end) {
|
|
WARN_ON(ptr > end);
|
|
break;
|
|
}
|
|
iref = (struct btrfs_extent_inline_ref *)ptr;
|
|
type = btrfs_get_extent_inline_ref_type(leaf, iref, needed);
|
|
if (type == BTRFS_REF_TYPE_INVALID) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (want < type)
|
|
break;
|
|
if (want > type) {
|
|
ptr += btrfs_extent_inline_ref_size(type);
|
|
continue;
|
|
}
|
|
|
|
if (type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
struct btrfs_extent_data_ref *dref;
|
|
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
if (match_extent_data_ref(leaf, dref, root_objectid,
|
|
owner, offset)) {
|
|
err = 0;
|
|
break;
|
|
}
|
|
if (hash_extent_data_ref_item(leaf, dref) <
|
|
hash_extent_data_ref(root_objectid, owner, offset))
|
|
break;
|
|
} else {
|
|
u64 ref_offset;
|
|
ref_offset = btrfs_extent_inline_ref_offset(leaf, iref);
|
|
if (parent > 0) {
|
|
if (parent == ref_offset) {
|
|
err = 0;
|
|
break;
|
|
}
|
|
if (ref_offset < parent)
|
|
break;
|
|
} else {
|
|
if (root_objectid == ref_offset) {
|
|
err = 0;
|
|
break;
|
|
}
|
|
if (ref_offset < root_objectid)
|
|
break;
|
|
}
|
|
}
|
|
ptr += btrfs_extent_inline_ref_size(type);
|
|
}
|
|
if (err == -ENOENT && insert) {
|
|
if (item_size + extra_size >=
|
|
BTRFS_MAX_EXTENT_ITEM_SIZE(root)) {
|
|
err = -EAGAIN;
|
|
goto out;
|
|
}
|
|
/*
|
|
* To add new inline back ref, we have to make sure
|
|
* there is no corresponding back ref item.
|
|
* For simplicity, we just do not add new inline back
|
|
* ref if there is any kind of item for this block
|
|
*/
|
|
if (find_next_key(path, 0, &key) == 0 &&
|
|
key.objectid == bytenr &&
|
|
key.type < BTRFS_BLOCK_GROUP_ITEM_KEY) {
|
|
err = -EAGAIN;
|
|
goto out;
|
|
}
|
|
}
|
|
*ref_ret = (struct btrfs_extent_inline_ref *)ptr;
|
|
out:
|
|
if (insert) {
|
|
path->keep_locks = 0;
|
|
btrfs_unlock_up_safe(path, 1);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* helper to add new inline back ref
|
|
*/
|
|
static noinline_for_stack
|
|
void setup_inline_extent_backref(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_extent_inline_ref *iref,
|
|
u64 parent, u64 root_objectid,
|
|
u64 owner, u64 offset, int refs_to_add,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_item *ei;
|
|
unsigned long ptr;
|
|
unsigned long end;
|
|
unsigned long item_offset;
|
|
u64 refs;
|
|
int size;
|
|
int type;
|
|
|
|
leaf = path->nodes[0];
|
|
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
item_offset = (unsigned long)iref - (unsigned long)ei;
|
|
|
|
type = extent_ref_type(parent, owner);
|
|
size = btrfs_extent_inline_ref_size(type);
|
|
|
|
btrfs_extend_item(fs_info, path, size);
|
|
|
|
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
refs = btrfs_extent_refs(leaf, ei);
|
|
refs += refs_to_add;
|
|
btrfs_set_extent_refs(leaf, ei, refs);
|
|
if (extent_op)
|
|
__run_delayed_extent_op(extent_op, leaf, ei);
|
|
|
|
ptr = (unsigned long)ei + item_offset;
|
|
end = (unsigned long)ei + btrfs_item_size_nr(leaf, path->slots[0]);
|
|
if (ptr < end - size)
|
|
memmove_extent_buffer(leaf, ptr + size, ptr,
|
|
end - size - ptr);
|
|
|
|
iref = (struct btrfs_extent_inline_ref *)ptr;
|
|
btrfs_set_extent_inline_ref_type(leaf, iref, type);
|
|
if (type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
struct btrfs_extent_data_ref *dref;
|
|
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
btrfs_set_extent_data_ref_root(leaf, dref, root_objectid);
|
|
btrfs_set_extent_data_ref_objectid(leaf, dref, owner);
|
|
btrfs_set_extent_data_ref_offset(leaf, dref, offset);
|
|
btrfs_set_extent_data_ref_count(leaf, dref, refs_to_add);
|
|
} else if (type == BTRFS_SHARED_DATA_REF_KEY) {
|
|
struct btrfs_shared_data_ref *sref;
|
|
sref = (struct btrfs_shared_data_ref *)(iref + 1);
|
|
btrfs_set_shared_data_ref_count(leaf, sref, refs_to_add);
|
|
btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
|
|
} else if (type == BTRFS_SHARED_BLOCK_REF_KEY) {
|
|
btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
|
|
} else {
|
|
btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
|
|
}
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
}
|
|
|
|
static int lookup_extent_backref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_extent_inline_ref **ref_ret,
|
|
u64 bytenr, u64 num_bytes, u64 parent,
|
|
u64 root_objectid, u64 owner, u64 offset)
|
|
{
|
|
int ret;
|
|
|
|
ret = lookup_inline_extent_backref(trans, fs_info, path, ref_ret,
|
|
bytenr, num_bytes, parent,
|
|
root_objectid, owner, offset, 0);
|
|
if (ret != -ENOENT)
|
|
return ret;
|
|
|
|
btrfs_release_path(path);
|
|
*ref_ret = NULL;
|
|
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
ret = lookup_tree_block_ref(trans, fs_info, path, bytenr,
|
|
parent, root_objectid);
|
|
} else {
|
|
ret = lookup_extent_data_ref(trans, fs_info, path, bytenr,
|
|
parent, root_objectid, owner,
|
|
offset);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper to update/remove inline back ref
|
|
*/
|
|
static noinline_for_stack
|
|
void update_inline_extent_backref(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_extent_inline_ref *iref,
|
|
int refs_to_mod,
|
|
struct btrfs_delayed_extent_op *extent_op,
|
|
int *last_ref)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_item *ei;
|
|
struct btrfs_extent_data_ref *dref = NULL;
|
|
struct btrfs_shared_data_ref *sref = NULL;
|
|
unsigned long ptr;
|
|
unsigned long end;
|
|
u32 item_size;
|
|
int size;
|
|
int type;
|
|
u64 refs;
|
|
|
|
leaf = path->nodes[0];
|
|
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
refs = btrfs_extent_refs(leaf, ei);
|
|
WARN_ON(refs_to_mod < 0 && refs + refs_to_mod <= 0);
|
|
refs += refs_to_mod;
|
|
btrfs_set_extent_refs(leaf, ei, refs);
|
|
if (extent_op)
|
|
__run_delayed_extent_op(extent_op, leaf, ei);
|
|
|
|
/*
|
|
* If type is invalid, we should have bailed out after
|
|
* lookup_inline_extent_backref().
|
|
*/
|
|
type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_ANY);
|
|
ASSERT(type != BTRFS_REF_TYPE_INVALID);
|
|
|
|
if (type == BTRFS_EXTENT_DATA_REF_KEY) {
|
|
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
refs = btrfs_extent_data_ref_count(leaf, dref);
|
|
} else if (type == BTRFS_SHARED_DATA_REF_KEY) {
|
|
sref = (struct btrfs_shared_data_ref *)(iref + 1);
|
|
refs = btrfs_shared_data_ref_count(leaf, sref);
|
|
} else {
|
|
refs = 1;
|
|
BUG_ON(refs_to_mod != -1);
|
|
}
|
|
|
|
BUG_ON(refs_to_mod < 0 && refs < -refs_to_mod);
|
|
refs += refs_to_mod;
|
|
|
|
if (refs > 0) {
|
|
if (type == BTRFS_EXTENT_DATA_REF_KEY)
|
|
btrfs_set_extent_data_ref_count(leaf, dref, refs);
|
|
else
|
|
btrfs_set_shared_data_ref_count(leaf, sref, refs);
|
|
} else {
|
|
*last_ref = 1;
|
|
size = btrfs_extent_inline_ref_size(type);
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
ptr = (unsigned long)iref;
|
|
end = (unsigned long)ei + item_size;
|
|
if (ptr + size < end)
|
|
memmove_extent_buffer(leaf, ptr, ptr + size,
|
|
end - ptr - size);
|
|
item_size -= size;
|
|
btrfs_truncate_item(fs_info, path, item_size, 1);
|
|
}
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
}
|
|
|
|
static noinline_for_stack
|
|
int insert_inline_extent_backref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, u64 num_bytes, u64 parent,
|
|
u64 root_objectid, u64 owner,
|
|
u64 offset, int refs_to_add,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_extent_inline_ref *iref;
|
|
int ret;
|
|
|
|
ret = lookup_inline_extent_backref(trans, fs_info, path, &iref,
|
|
bytenr, num_bytes, parent,
|
|
root_objectid, owner, offset, 1);
|
|
if (ret == 0) {
|
|
BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID);
|
|
update_inline_extent_backref(fs_info, path, iref,
|
|
refs_to_add, extent_op, NULL);
|
|
} else if (ret == -ENOENT) {
|
|
setup_inline_extent_backref(fs_info, path, iref, parent,
|
|
root_objectid, owner, offset,
|
|
refs_to_add, extent_op);
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int insert_extent_backref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 bytenr, u64 parent, u64 root_objectid,
|
|
u64 owner, u64 offset, int refs_to_add)
|
|
{
|
|
int ret;
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
BUG_ON(refs_to_add != 1);
|
|
ret = insert_tree_block_ref(trans, fs_info, path, bytenr,
|
|
parent, root_objectid);
|
|
} else {
|
|
ret = insert_extent_data_ref(trans, fs_info, path, bytenr,
|
|
parent, root_objectid,
|
|
owner, offset, refs_to_add);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int remove_extent_backref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_extent_inline_ref *iref,
|
|
int refs_to_drop, int is_data, int *last_ref)
|
|
{
|
|
int ret = 0;
|
|
|
|
BUG_ON(!is_data && refs_to_drop != 1);
|
|
if (iref) {
|
|
update_inline_extent_backref(fs_info, path, iref,
|
|
-refs_to_drop, NULL, last_ref);
|
|
} else if (is_data) {
|
|
ret = remove_extent_data_ref(trans, fs_info, path, refs_to_drop,
|
|
last_ref);
|
|
} else {
|
|
*last_ref = 1;
|
|
ret = btrfs_del_item(trans, fs_info->extent_root, path);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
|
|
static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len,
|
|
u64 *discarded_bytes)
|
|
{
|
|
int j, ret = 0;
|
|
u64 bytes_left, end;
|
|
u64 aligned_start = ALIGN(start, 1 << 9);
|
|
|
|
if (WARN_ON(start != aligned_start)) {
|
|
len -= aligned_start - start;
|
|
len = round_down(len, 1 << 9);
|
|
start = aligned_start;
|
|
}
|
|
|
|
*discarded_bytes = 0;
|
|
|
|
if (!len)
|
|
return 0;
|
|
|
|
end = start + len;
|
|
bytes_left = len;
|
|
|
|
/* Skip any superblocks on this device. */
|
|
for (j = 0; j < BTRFS_SUPER_MIRROR_MAX; j++) {
|
|
u64 sb_start = btrfs_sb_offset(j);
|
|
u64 sb_end = sb_start + BTRFS_SUPER_INFO_SIZE;
|
|
u64 size = sb_start - start;
|
|
|
|
if (!in_range(sb_start, start, bytes_left) &&
|
|
!in_range(sb_end, start, bytes_left) &&
|
|
!in_range(start, sb_start, BTRFS_SUPER_INFO_SIZE))
|
|
continue;
|
|
|
|
/*
|
|
* Superblock spans beginning of range. Adjust start and
|
|
* try again.
|
|
*/
|
|
if (sb_start <= start) {
|
|
start += sb_end - start;
|
|
if (start > end) {
|
|
bytes_left = 0;
|
|
break;
|
|
}
|
|
bytes_left = end - start;
|
|
continue;
|
|
}
|
|
|
|
if (size) {
|
|
ret = blkdev_issue_discard(bdev, start >> 9, size >> 9,
|
|
GFP_NOFS, 0);
|
|
if (!ret)
|
|
*discarded_bytes += size;
|
|
else if (ret != -EOPNOTSUPP)
|
|
return ret;
|
|
}
|
|
|
|
start = sb_end;
|
|
if (start > end) {
|
|
bytes_left = 0;
|
|
break;
|
|
}
|
|
bytes_left = end - start;
|
|
}
|
|
|
|
if (bytes_left) {
|
|
ret = blkdev_issue_discard(bdev, start >> 9, bytes_left >> 9,
|
|
GFP_NOFS, 0);
|
|
if (!ret)
|
|
*discarded_bytes += bytes_left;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
|
|
u64 num_bytes, u64 *actual_bytes)
|
|
{
|
|
int ret;
|
|
u64 discarded_bytes = 0;
|
|
struct btrfs_bio *bbio = NULL;
|
|
|
|
|
|
/*
|
|
* Avoid races with device replace and make sure our bbio has devices
|
|
* associated to its stripes that don't go away while we are discarding.
|
|
*/
|
|
btrfs_bio_counter_inc_blocked(fs_info);
|
|
/* Tell the block device(s) that the sectors can be discarded */
|
|
ret = btrfs_map_block(fs_info, BTRFS_MAP_DISCARD, bytenr, &num_bytes,
|
|
&bbio, 0);
|
|
/* Error condition is -ENOMEM */
|
|
if (!ret) {
|
|
struct btrfs_bio_stripe *stripe = bbio->stripes;
|
|
int i;
|
|
|
|
|
|
for (i = 0; i < bbio->num_stripes; i++, stripe++) {
|
|
u64 bytes;
|
|
if (!stripe->dev->can_discard)
|
|
continue;
|
|
|
|
ret = btrfs_issue_discard(stripe->dev->bdev,
|
|
stripe->physical,
|
|
stripe->length,
|
|
&bytes);
|
|
if (!ret)
|
|
discarded_bytes += bytes;
|
|
else if (ret != -EOPNOTSUPP)
|
|
break; /* Logic errors or -ENOMEM, or -EIO but I don't know how that could happen JDM */
|
|
|
|
/*
|
|
* Just in case we get back EOPNOTSUPP for some reason,
|
|
* just ignore the return value so we don't screw up
|
|
* people calling discard_extent.
|
|
*/
|
|
ret = 0;
|
|
}
|
|
btrfs_put_bbio(bbio);
|
|
}
|
|
btrfs_bio_counter_dec(fs_info);
|
|
|
|
if (actual_bytes)
|
|
*actual_bytes = discarded_bytes;
|
|
|
|
|
|
if (ret == -EOPNOTSUPP)
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
/* Can return -ENOMEM */
|
|
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 bytenr, u64 num_bytes, u64 parent,
|
|
u64 root_objectid, u64 owner, u64 offset)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int old_ref_mod, new_ref_mod;
|
|
int ret;
|
|
|
|
BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID &&
|
|
root_objectid == BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
btrfs_ref_tree_mod(root, bytenr, num_bytes, parent, root_objectid,
|
|
owner, offset, BTRFS_ADD_DELAYED_REF);
|
|
|
|
if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
|
|
num_bytes, parent,
|
|
root_objectid, (int)owner,
|
|
BTRFS_ADD_DELAYED_REF, NULL,
|
|
&old_ref_mod, &new_ref_mod);
|
|
} else {
|
|
ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
|
|
num_bytes, parent,
|
|
root_objectid, owner, offset,
|
|
0, BTRFS_ADD_DELAYED_REF,
|
|
&old_ref_mod, &new_ref_mod);
|
|
}
|
|
|
|
if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0)
|
|
add_pinned_bytes(fs_info, -num_bytes, owner, root_objectid);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_node *node,
|
|
u64 parent, u64 root_objectid,
|
|
u64 owner, u64 offset, int refs_to_add,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_item *item;
|
|
struct btrfs_key key;
|
|
u64 bytenr = node->bytenr;
|
|
u64 num_bytes = node->num_bytes;
|
|
u64 refs;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->reada = READA_FORWARD;
|
|
path->leave_spinning = 1;
|
|
/* this will setup the path even if it fails to insert the back ref */
|
|
ret = insert_inline_extent_backref(trans, fs_info, path, bytenr,
|
|
num_bytes, parent, root_objectid,
|
|
owner, offset,
|
|
refs_to_add, extent_op);
|
|
if ((ret < 0 && ret != -EAGAIN) || !ret)
|
|
goto out;
|
|
|
|
/*
|
|
* Ok we had -EAGAIN which means we didn't have space to insert and
|
|
* inline extent ref, so just update the reference count and add a
|
|
* normal backref.
|
|
*/
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
refs = btrfs_extent_refs(leaf, item);
|
|
btrfs_set_extent_refs(leaf, item, refs + refs_to_add);
|
|
if (extent_op)
|
|
__run_delayed_extent_op(extent_op, leaf, item);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_release_path(path);
|
|
|
|
path->reada = READA_FORWARD;
|
|
path->leave_spinning = 1;
|
|
/* now insert the actual backref */
|
|
ret = insert_extent_backref(trans, fs_info, path, bytenr, parent,
|
|
root_objectid, owner, offset, refs_to_add);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int run_delayed_data_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_node *node,
|
|
struct btrfs_delayed_extent_op *extent_op,
|
|
int insert_reserved)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_delayed_data_ref *ref;
|
|
struct btrfs_key ins;
|
|
u64 parent = 0;
|
|
u64 ref_root = 0;
|
|
u64 flags = 0;
|
|
|
|
ins.objectid = node->bytenr;
|
|
ins.offset = node->num_bytes;
|
|
ins.type = BTRFS_EXTENT_ITEM_KEY;
|
|
|
|
ref = btrfs_delayed_node_to_data_ref(node);
|
|
trace_run_delayed_data_ref(fs_info, node, ref, node->action);
|
|
|
|
if (node->type == BTRFS_SHARED_DATA_REF_KEY)
|
|
parent = ref->parent;
|
|
ref_root = ref->root;
|
|
|
|
if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
|
|
if (extent_op)
|
|
flags |= extent_op->flags_to_set;
|
|
ret = alloc_reserved_file_extent(trans, fs_info,
|
|
parent, ref_root, flags,
|
|
ref->objectid, ref->offset,
|
|
&ins, node->ref_mod);
|
|
} else if (node->action == BTRFS_ADD_DELAYED_REF) {
|
|
ret = __btrfs_inc_extent_ref(trans, fs_info, node, parent,
|
|
ref_root, ref->objectid,
|
|
ref->offset, node->ref_mod,
|
|
extent_op);
|
|
} else if (node->action == BTRFS_DROP_DELAYED_REF) {
|
|
ret = __btrfs_free_extent(trans, fs_info, node, parent,
|
|
ref_root, ref->objectid,
|
|
ref->offset, node->ref_mod,
|
|
extent_op);
|
|
} else {
|
|
BUG();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void __run_delayed_extent_op(struct btrfs_delayed_extent_op *extent_op,
|
|
struct extent_buffer *leaf,
|
|
struct btrfs_extent_item *ei)
|
|
{
|
|
u64 flags = btrfs_extent_flags(leaf, ei);
|
|
if (extent_op->update_flags) {
|
|
flags |= extent_op->flags_to_set;
|
|
btrfs_set_extent_flags(leaf, ei, flags);
|
|
}
|
|
|
|
if (extent_op->update_key) {
|
|
struct btrfs_tree_block_info *bi;
|
|
BUG_ON(!(flags & BTRFS_EXTENT_FLAG_TREE_BLOCK));
|
|
bi = (struct btrfs_tree_block_info *)(ei + 1);
|
|
btrfs_set_tree_block_key(leaf, bi, &extent_op->key);
|
|
}
|
|
}
|
|
|
|
static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_head *head,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
struct btrfs_extent_item *ei;
|
|
struct extent_buffer *leaf;
|
|
u32 item_size;
|
|
int ret;
|
|
int err = 0;
|
|
int metadata = !extent_op->is_data;
|
|
|
|
if (trans->aborted)
|
|
return 0;
|
|
|
|
if (metadata && !btrfs_fs_incompat(fs_info, SKINNY_METADATA))
|
|
metadata = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = head->bytenr;
|
|
|
|
if (metadata) {
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
key.offset = extent_op->level;
|
|
} else {
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = head->num_bytes;
|
|
}
|
|
|
|
again:
|
|
path->reada = READA_FORWARD;
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 1);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
if (ret > 0) {
|
|
if (metadata) {
|
|
if (path->slots[0] > 0) {
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key,
|
|
path->slots[0]);
|
|
if (key.objectid == head->bytenr &&
|
|
key.type == BTRFS_EXTENT_ITEM_KEY &&
|
|
key.offset == head->num_bytes)
|
|
ret = 0;
|
|
}
|
|
if (ret > 0) {
|
|
btrfs_release_path(path);
|
|
metadata = 0;
|
|
|
|
key.objectid = head->bytenr;
|
|
key.offset = head->num_bytes;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
goto again;
|
|
}
|
|
} else {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
if (item_size < sizeof(*ei)) {
|
|
ret = convert_extent_item_v0(trans, fs_info, path, (u64)-1, 0);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out;
|
|
}
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
}
|
|
#endif
|
|
BUG_ON(item_size < sizeof(*ei));
|
|
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
__run_delayed_extent_op(extent_op, leaf, ei);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return err;
|
|
}
|
|
|
|
static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_node *node,
|
|
struct btrfs_delayed_extent_op *extent_op,
|
|
int insert_reserved)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_delayed_tree_ref *ref;
|
|
struct btrfs_key ins;
|
|
u64 parent = 0;
|
|
u64 ref_root = 0;
|
|
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
|
|
|
|
ref = btrfs_delayed_node_to_tree_ref(node);
|
|
trace_run_delayed_tree_ref(fs_info, node, ref, node->action);
|
|
|
|
if (node->type == BTRFS_SHARED_BLOCK_REF_KEY)
|
|
parent = ref->parent;
|
|
ref_root = ref->root;
|
|
|
|
ins.objectid = node->bytenr;
|
|
if (skinny_metadata) {
|
|
ins.offset = ref->level;
|
|
ins.type = BTRFS_METADATA_ITEM_KEY;
|
|
} else {
|
|
ins.offset = node->num_bytes;
|
|
ins.type = BTRFS_EXTENT_ITEM_KEY;
|
|
}
|
|
|
|
if (node->ref_mod != 1) {
|
|
btrfs_err(fs_info,
|
|
"btree block(%llu) has %d references rather than 1: action %d ref_root %llu parent %llu",
|
|
node->bytenr, node->ref_mod, node->action, ref_root,
|
|
parent);
|
|
return -EIO;
|
|
}
|
|
if (node->action == BTRFS_ADD_DELAYED_REF && insert_reserved) {
|
|
BUG_ON(!extent_op || !extent_op->update_flags);
|
|
ret = alloc_reserved_tree_block(trans, fs_info,
|
|
parent, ref_root,
|
|
extent_op->flags_to_set,
|
|
&extent_op->key,
|
|
ref->level, &ins);
|
|
} else if (node->action == BTRFS_ADD_DELAYED_REF) {
|
|
ret = __btrfs_inc_extent_ref(trans, fs_info, node,
|
|
parent, ref_root,
|
|
ref->level, 0, 1,
|
|
extent_op);
|
|
} else if (node->action == BTRFS_DROP_DELAYED_REF) {
|
|
ret = __btrfs_free_extent(trans, fs_info, node,
|
|
parent, ref_root,
|
|
ref->level, 0, 1, extent_op);
|
|
} else {
|
|
BUG();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* helper function to actually process a single delayed ref entry */
|
|
static int run_one_delayed_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_node *node,
|
|
struct btrfs_delayed_extent_op *extent_op,
|
|
int insert_reserved)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (trans->aborted) {
|
|
if (insert_reserved)
|
|
btrfs_pin_extent(fs_info, node->bytenr,
|
|
node->num_bytes, 1);
|
|
return 0;
|
|
}
|
|
|
|
if (node->type == BTRFS_TREE_BLOCK_REF_KEY ||
|
|
node->type == BTRFS_SHARED_BLOCK_REF_KEY)
|
|
ret = run_delayed_tree_ref(trans, fs_info, node, extent_op,
|
|
insert_reserved);
|
|
else if (node->type == BTRFS_EXTENT_DATA_REF_KEY ||
|
|
node->type == BTRFS_SHARED_DATA_REF_KEY)
|
|
ret = run_delayed_data_ref(trans, fs_info, node, extent_op,
|
|
insert_reserved);
|
|
else
|
|
BUG();
|
|
return ret;
|
|
}
|
|
|
|
static inline struct btrfs_delayed_ref_node *
|
|
select_delayed_ref(struct btrfs_delayed_ref_head *head)
|
|
{
|
|
struct btrfs_delayed_ref_node *ref;
|
|
|
|
if (RB_EMPTY_ROOT(&head->ref_tree))
|
|
return NULL;
|
|
|
|
/*
|
|
* Select a delayed ref of type BTRFS_ADD_DELAYED_REF first.
|
|
* This is to prevent a ref count from going down to zero, which deletes
|
|
* the extent item from the extent tree, when there still are references
|
|
* to add, which would fail because they would not find the extent item.
|
|
*/
|
|
if (!list_empty(&head->ref_add_list))
|
|
return list_first_entry(&head->ref_add_list,
|
|
struct btrfs_delayed_ref_node, add_list);
|
|
|
|
ref = rb_entry(rb_first(&head->ref_tree),
|
|
struct btrfs_delayed_ref_node, ref_node);
|
|
ASSERT(list_empty(&ref->add_list));
|
|
return ref;
|
|
}
|
|
|
|
static void unselect_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
|
|
struct btrfs_delayed_ref_head *head)
|
|
{
|
|
spin_lock(&delayed_refs->lock);
|
|
head->processing = 0;
|
|
delayed_refs->num_heads_ready++;
|
|
spin_unlock(&delayed_refs->lock);
|
|
btrfs_delayed_ref_unlock(head);
|
|
}
|
|
|
|
static int cleanup_extent_op(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_head *head)
|
|
{
|
|
struct btrfs_delayed_extent_op *extent_op = head->extent_op;
|
|
int ret;
|
|
|
|
if (!extent_op)
|
|
return 0;
|
|
head->extent_op = NULL;
|
|
if (head->must_insert_reserved) {
|
|
btrfs_free_delayed_extent_op(extent_op);
|
|
return 0;
|
|
}
|
|
spin_unlock(&head->lock);
|
|
ret = run_delayed_extent_op(trans, fs_info, head, extent_op);
|
|
btrfs_free_delayed_extent_op(extent_op);
|
|
return ret ? ret : 1;
|
|
}
|
|
|
|
static int cleanup_ref_head(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_head *head)
|
|
{
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
int ret;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
|
|
ret = cleanup_extent_op(trans, fs_info, head);
|
|
if (ret < 0) {
|
|
unselect_delayed_ref_head(delayed_refs, head);
|
|
btrfs_debug(fs_info, "run_delayed_extent_op returned %d", ret);
|
|
return ret;
|
|
} else if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Need to drop our head ref lock and re-acquire the delayed ref lock
|
|
* and then re-check to make sure nobody got added.
|
|
*/
|
|
spin_unlock(&head->lock);
|
|
spin_lock(&delayed_refs->lock);
|
|
spin_lock(&head->lock);
|
|
if (!RB_EMPTY_ROOT(&head->ref_tree) || head->extent_op) {
|
|
spin_unlock(&head->lock);
|
|
spin_unlock(&delayed_refs->lock);
|
|
return 1;
|
|
}
|
|
delayed_refs->num_heads--;
|
|
rb_erase(&head->href_node, &delayed_refs->href_root);
|
|
RB_CLEAR_NODE(&head->href_node);
|
|
spin_unlock(&delayed_refs->lock);
|
|
spin_unlock(&head->lock);
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
|
|
trace_run_delayed_ref_head(fs_info, head, 0);
|
|
|
|
if (head->total_ref_mod < 0) {
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, head->bytenr);
|
|
ASSERT(cache);
|
|
percpu_counter_add(&cache->space_info->total_bytes_pinned,
|
|
-head->num_bytes);
|
|
btrfs_put_block_group(cache);
|
|
|
|
if (head->is_data) {
|
|
spin_lock(&delayed_refs->lock);
|
|
delayed_refs->pending_csums -= head->num_bytes;
|
|
spin_unlock(&delayed_refs->lock);
|
|
}
|
|
}
|
|
|
|
if (head->must_insert_reserved) {
|
|
btrfs_pin_extent(fs_info, head->bytenr,
|
|
head->num_bytes, 1);
|
|
if (head->is_data) {
|
|
ret = btrfs_del_csums(trans, fs_info, head->bytenr,
|
|
head->num_bytes);
|
|
}
|
|
}
|
|
|
|
/* Also free its reserved qgroup space */
|
|
btrfs_qgroup_free_delayed_ref(fs_info, head->qgroup_ref_root,
|
|
head->qgroup_reserved);
|
|
btrfs_delayed_ref_unlock(head);
|
|
btrfs_put_delayed_ref_head(head);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns 0 on success or if called with an already aborted transaction.
|
|
* Returns -ENOMEM or -EIO on failure and will abort the transaction.
|
|
*/
|
|
static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
unsigned long nr)
|
|
{
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_delayed_ref_node *ref;
|
|
struct btrfs_delayed_ref_head *locked_ref = NULL;
|
|
struct btrfs_delayed_extent_op *extent_op;
|
|
ktime_t start = ktime_get();
|
|
int ret;
|
|
unsigned long count = 0;
|
|
unsigned long actual_count = 0;
|
|
int must_insert_reserved = 0;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
while (1) {
|
|
if (!locked_ref) {
|
|
if (count >= nr)
|
|
break;
|
|
|
|
spin_lock(&delayed_refs->lock);
|
|
locked_ref = btrfs_select_ref_head(trans);
|
|
if (!locked_ref) {
|
|
spin_unlock(&delayed_refs->lock);
|
|
break;
|
|
}
|
|
|
|
/* grab the lock that says we are going to process
|
|
* all the refs for this head */
|
|
ret = btrfs_delayed_ref_lock(trans, locked_ref);
|
|
spin_unlock(&delayed_refs->lock);
|
|
/*
|
|
* we may have dropped the spin lock to get the head
|
|
* mutex lock, and that might have given someone else
|
|
* time to free the head. If that's true, it has been
|
|
* removed from our list and we can move on.
|
|
*/
|
|
if (ret == -EAGAIN) {
|
|
locked_ref = NULL;
|
|
count++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We need to try and merge add/drops of the same ref since we
|
|
* can run into issues with relocate dropping the implicit ref
|
|
* and then it being added back again before the drop can
|
|
* finish. If we merged anything we need to re-loop so we can
|
|
* get a good ref.
|
|
* Or we can get node references of the same type that weren't
|
|
* merged when created due to bumps in the tree mod seq, and
|
|
* we need to merge them to prevent adding an inline extent
|
|
* backref before dropping it (triggering a BUG_ON at
|
|
* insert_inline_extent_backref()).
|
|
*/
|
|
spin_lock(&locked_ref->lock);
|
|
btrfs_merge_delayed_refs(trans, fs_info, delayed_refs,
|
|
locked_ref);
|
|
|
|
/*
|
|
* locked_ref is the head node, so we have to go one
|
|
* node back for any delayed ref updates
|
|
*/
|
|
ref = select_delayed_ref(locked_ref);
|
|
|
|
if (ref && ref->seq &&
|
|
btrfs_check_delayed_seq(fs_info, delayed_refs, ref->seq)) {
|
|
spin_unlock(&locked_ref->lock);
|
|
unselect_delayed_ref_head(delayed_refs, locked_ref);
|
|
locked_ref = NULL;
|
|
cond_resched();
|
|
count++;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We're done processing refs in this ref_head, clean everything
|
|
* up and move on to the next ref_head.
|
|
*/
|
|
if (!ref) {
|
|
ret = cleanup_ref_head(trans, fs_info, locked_ref);
|
|
if (ret > 0 ) {
|
|
/* We dropped our lock, we need to loop. */
|
|
ret = 0;
|
|
continue;
|
|
} else if (ret) {
|
|
return ret;
|
|
}
|
|
locked_ref = NULL;
|
|
count++;
|
|
continue;
|
|
}
|
|
|
|
actual_count++;
|
|
ref->in_tree = 0;
|
|
rb_erase(&ref->ref_node, &locked_ref->ref_tree);
|
|
RB_CLEAR_NODE(&ref->ref_node);
|
|
if (!list_empty(&ref->add_list))
|
|
list_del(&ref->add_list);
|
|
/*
|
|
* When we play the delayed ref, also correct the ref_mod on
|
|
* head
|
|
*/
|
|
switch (ref->action) {
|
|
case BTRFS_ADD_DELAYED_REF:
|
|
case BTRFS_ADD_DELAYED_EXTENT:
|
|
locked_ref->ref_mod -= ref->ref_mod;
|
|
break;
|
|
case BTRFS_DROP_DELAYED_REF:
|
|
locked_ref->ref_mod += ref->ref_mod;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
|
|
/*
|
|
* Record the must-insert_reserved flag before we drop the spin
|
|
* lock.
|
|
*/
|
|
must_insert_reserved = locked_ref->must_insert_reserved;
|
|
locked_ref->must_insert_reserved = 0;
|
|
|
|
extent_op = locked_ref->extent_op;
|
|
locked_ref->extent_op = NULL;
|
|
spin_unlock(&locked_ref->lock);
|
|
|
|
ret = run_one_delayed_ref(trans, fs_info, ref, extent_op,
|
|
must_insert_reserved);
|
|
|
|
btrfs_free_delayed_extent_op(extent_op);
|
|
if (ret) {
|
|
unselect_delayed_ref_head(delayed_refs, locked_ref);
|
|
btrfs_put_delayed_ref(ref);
|
|
btrfs_debug(fs_info, "run_one_delayed_ref returned %d",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
btrfs_put_delayed_ref(ref);
|
|
count++;
|
|
cond_resched();
|
|
}
|
|
|
|
/*
|
|
* We don't want to include ref heads since we can have empty ref heads
|
|
* and those will drastically skew our runtime down since we just do
|
|
* accounting, no actual extent tree updates.
|
|
*/
|
|
if (actual_count > 0) {
|
|
u64 runtime = ktime_to_ns(ktime_sub(ktime_get(), start));
|
|
u64 avg;
|
|
|
|
/*
|
|
* We weigh the current average higher than our current runtime
|
|
* to avoid large swings in the average.
|
|
*/
|
|
spin_lock(&delayed_refs->lock);
|
|
avg = fs_info->avg_delayed_ref_runtime * 3 + runtime;
|
|
fs_info->avg_delayed_ref_runtime = avg >> 2; /* div by 4 */
|
|
spin_unlock(&delayed_refs->lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef SCRAMBLE_DELAYED_REFS
|
|
/*
|
|
* Normally delayed refs get processed in ascending bytenr order. This
|
|
* correlates in most cases to the order added. To expose dependencies on this
|
|
* order, we start to process the tree in the middle instead of the beginning
|
|
*/
|
|
static u64 find_middle(struct rb_root *root)
|
|
{
|
|
struct rb_node *n = root->rb_node;
|
|
struct btrfs_delayed_ref_node *entry;
|
|
int alt = 1;
|
|
u64 middle;
|
|
u64 first = 0, last = 0;
|
|
|
|
n = rb_first(root);
|
|
if (n) {
|
|
entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
|
|
first = entry->bytenr;
|
|
}
|
|
n = rb_last(root);
|
|
if (n) {
|
|
entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
|
|
last = entry->bytenr;
|
|
}
|
|
n = root->rb_node;
|
|
|
|
while (n) {
|
|
entry = rb_entry(n, struct btrfs_delayed_ref_node, rb_node);
|
|
WARN_ON(!entry->in_tree);
|
|
|
|
middle = entry->bytenr;
|
|
|
|
if (alt)
|
|
n = n->rb_left;
|
|
else
|
|
n = n->rb_right;
|
|
|
|
alt = 1 - alt;
|
|
}
|
|
return middle;
|
|
}
|
|
#endif
|
|
|
|
static inline u64 heads_to_leaves(struct btrfs_fs_info *fs_info, u64 heads)
|
|
{
|
|
u64 num_bytes;
|
|
|
|
num_bytes = heads * (sizeof(struct btrfs_extent_item) +
|
|
sizeof(struct btrfs_extent_inline_ref));
|
|
if (!btrfs_fs_incompat(fs_info, SKINNY_METADATA))
|
|
num_bytes += heads * sizeof(struct btrfs_tree_block_info);
|
|
|
|
/*
|
|
* We don't ever fill up leaves all the way so multiply by 2 just to be
|
|
* closer to what we're really going to want to use.
|
|
*/
|
|
return div_u64(num_bytes, BTRFS_LEAF_DATA_SIZE(fs_info));
|
|
}
|
|
|
|
/*
|
|
* Takes the number of bytes to be csumm'ed and figures out how many leaves it
|
|
* would require to store the csums for that many bytes.
|
|
*/
|
|
u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes)
|
|
{
|
|
u64 csum_size;
|
|
u64 num_csums_per_leaf;
|
|
u64 num_csums;
|
|
|
|
csum_size = BTRFS_MAX_ITEM_SIZE(fs_info);
|
|
num_csums_per_leaf = div64_u64(csum_size,
|
|
(u64)btrfs_super_csum_size(fs_info->super_copy));
|
|
num_csums = div64_u64(csum_bytes, fs_info->sectorsize);
|
|
num_csums += num_csums_per_leaf - 1;
|
|
num_csums = div64_u64(num_csums, num_csums_per_leaf);
|
|
return num_csums;
|
|
}
|
|
|
|
int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_rsv *global_rsv;
|
|
u64 num_heads = trans->transaction->delayed_refs.num_heads_ready;
|
|
u64 csum_bytes = trans->transaction->delayed_refs.pending_csums;
|
|
u64 num_dirty_bgs = trans->transaction->num_dirty_bgs;
|
|
u64 num_bytes, num_dirty_bgs_bytes;
|
|
int ret = 0;
|
|
|
|
num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
num_heads = heads_to_leaves(fs_info, num_heads);
|
|
if (num_heads > 1)
|
|
num_bytes += (num_heads - 1) * fs_info->nodesize;
|
|
num_bytes <<= 1;
|
|
num_bytes += btrfs_csum_bytes_to_leaves(fs_info, csum_bytes) *
|
|
fs_info->nodesize;
|
|
num_dirty_bgs_bytes = btrfs_calc_trans_metadata_size(fs_info,
|
|
num_dirty_bgs);
|
|
global_rsv = &fs_info->global_block_rsv;
|
|
|
|
/*
|
|
* If we can't allocate any more chunks lets make sure we have _lots_ of
|
|
* wiggle room since running delayed refs can create more delayed refs.
|
|
*/
|
|
if (global_rsv->space_info->full) {
|
|
num_dirty_bgs_bytes <<= 1;
|
|
num_bytes <<= 1;
|
|
}
|
|
|
|
spin_lock(&global_rsv->lock);
|
|
if (global_rsv->reserved <= num_bytes + num_dirty_bgs_bytes)
|
|
ret = 1;
|
|
spin_unlock(&global_rsv->lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
u64 num_entries =
|
|
atomic_read(&trans->transaction->delayed_refs.num_entries);
|
|
u64 avg_runtime;
|
|
u64 val;
|
|
|
|
smp_mb();
|
|
avg_runtime = fs_info->avg_delayed_ref_runtime;
|
|
val = num_entries * avg_runtime;
|
|
if (val >= NSEC_PER_SEC)
|
|
return 1;
|
|
if (val >= NSEC_PER_SEC / 2)
|
|
return 2;
|
|
|
|
return btrfs_check_space_for_delayed_refs(trans, fs_info);
|
|
}
|
|
|
|
struct async_delayed_refs {
|
|
struct btrfs_root *root;
|
|
u64 transid;
|
|
int count;
|
|
int error;
|
|
int sync;
|
|
struct completion wait;
|
|
struct btrfs_work work;
|
|
};
|
|
|
|
static inline struct async_delayed_refs *
|
|
to_async_delayed_refs(struct btrfs_work *work)
|
|
{
|
|
return container_of(work, struct async_delayed_refs, work);
|
|
}
|
|
|
|
static void delayed_ref_async_start(struct btrfs_work *work)
|
|
{
|
|
struct async_delayed_refs *async = to_async_delayed_refs(work);
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = async->root->fs_info;
|
|
int ret;
|
|
|
|
/* if the commit is already started, we don't need to wait here */
|
|
if (btrfs_transaction_blocked(fs_info))
|
|
goto done;
|
|
|
|
trans = btrfs_join_transaction(async->root);
|
|
if (IS_ERR(trans)) {
|
|
async->error = PTR_ERR(trans);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* trans->sync means that when we call end_transaction, we won't
|
|
* wait on delayed refs
|
|
*/
|
|
trans->sync = true;
|
|
|
|
/* Don't bother flushing if we got into a different transaction */
|
|
if (trans->transid > async->transid)
|
|
goto end;
|
|
|
|
ret = btrfs_run_delayed_refs(trans, fs_info, async->count);
|
|
if (ret)
|
|
async->error = ret;
|
|
end:
|
|
ret = btrfs_end_transaction(trans);
|
|
if (ret && !async->error)
|
|
async->error = ret;
|
|
done:
|
|
if (async->sync)
|
|
complete(&async->wait);
|
|
else
|
|
kfree(async);
|
|
}
|
|
|
|
int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
|
|
unsigned long count, u64 transid, int wait)
|
|
{
|
|
struct async_delayed_refs *async;
|
|
int ret;
|
|
|
|
async = kmalloc(sizeof(*async), GFP_NOFS);
|
|
if (!async)
|
|
return -ENOMEM;
|
|
|
|
async->root = fs_info->tree_root;
|
|
async->count = count;
|
|
async->error = 0;
|
|
async->transid = transid;
|
|
if (wait)
|
|
async->sync = 1;
|
|
else
|
|
async->sync = 0;
|
|
init_completion(&async->wait);
|
|
|
|
btrfs_init_work(&async->work, btrfs_extent_refs_helper,
|
|
delayed_ref_async_start, NULL, NULL);
|
|
|
|
btrfs_queue_work(fs_info->extent_workers, &async->work);
|
|
|
|
if (wait) {
|
|
wait_for_completion(&async->wait);
|
|
ret = async->error;
|
|
kfree(async);
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this starts processing the delayed reference count updates and
|
|
* extent insertions we have queued up so far. count can be
|
|
* 0, which means to process everything in the tree at the start
|
|
* of the run (but not newly added entries), or it can be some target
|
|
* number you'd like to process.
|
|
*
|
|
* Returns 0 on success or if called with an aborted transaction
|
|
* Returns <0 on error and aborts the transaction
|
|
*/
|
|
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, unsigned long count)
|
|
{
|
|
struct rb_node *node;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_delayed_ref_head *head;
|
|
int ret;
|
|
int run_all = count == (unsigned long)-1;
|
|
bool can_flush_pending_bgs = trans->can_flush_pending_bgs;
|
|
|
|
/* We'll clean this up in btrfs_cleanup_transaction */
|
|
if (trans->aborted)
|
|
return 0;
|
|
|
|
if (test_bit(BTRFS_FS_CREATING_FREE_SPACE_TREE, &fs_info->flags))
|
|
return 0;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
if (count == 0)
|
|
count = atomic_read(&delayed_refs->num_entries) * 2;
|
|
|
|
again:
|
|
#ifdef SCRAMBLE_DELAYED_REFS
|
|
delayed_refs->run_delayed_start = find_middle(&delayed_refs->root);
|
|
#endif
|
|
trans->can_flush_pending_bgs = false;
|
|
ret = __btrfs_run_delayed_refs(trans, fs_info, count);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
return ret;
|
|
}
|
|
|
|
if (run_all) {
|
|
if (!list_empty(&trans->new_bgs))
|
|
btrfs_create_pending_block_groups(trans, fs_info);
|
|
|
|
spin_lock(&delayed_refs->lock);
|
|
node = rb_first(&delayed_refs->href_root);
|
|
if (!node) {
|
|
spin_unlock(&delayed_refs->lock);
|
|
goto out;
|
|
}
|
|
head = rb_entry(node, struct btrfs_delayed_ref_head,
|
|
href_node);
|
|
refcount_inc(&head->refs);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
/* Mutex was contended, block until it's released and retry. */
|
|
mutex_lock(&head->mutex);
|
|
mutex_unlock(&head->mutex);
|
|
|
|
btrfs_put_delayed_ref_head(head);
|
|
cond_resched();
|
|
goto again;
|
|
}
|
|
out:
|
|
trans->can_flush_pending_bgs = can_flush_pending_bgs;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 num_bytes, u64 flags,
|
|
int level, int is_data)
|
|
{
|
|
struct btrfs_delayed_extent_op *extent_op;
|
|
int ret;
|
|
|
|
extent_op = btrfs_alloc_delayed_extent_op();
|
|
if (!extent_op)
|
|
return -ENOMEM;
|
|
|
|
extent_op->flags_to_set = flags;
|
|
extent_op->update_flags = true;
|
|
extent_op->update_key = false;
|
|
extent_op->is_data = is_data ? true : false;
|
|
extent_op->level = level;
|
|
|
|
ret = btrfs_add_delayed_extent_op(fs_info, trans, bytenr,
|
|
num_bytes, extent_op);
|
|
if (ret)
|
|
btrfs_free_delayed_extent_op(extent_op);
|
|
return ret;
|
|
}
|
|
|
|
static noinline int check_delayed_ref(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 objectid, u64 offset, u64 bytenr)
|
|
{
|
|
struct btrfs_delayed_ref_head *head;
|
|
struct btrfs_delayed_ref_node *ref;
|
|
struct btrfs_delayed_data_ref *data_ref;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_transaction *cur_trans;
|
|
struct rb_node *node;
|
|
int ret = 0;
|
|
|
|
cur_trans = root->fs_info->running_transaction;
|
|
if (!cur_trans)
|
|
return 0;
|
|
|
|
delayed_refs = &cur_trans->delayed_refs;
|
|
spin_lock(&delayed_refs->lock);
|
|
head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
|
|
if (!head) {
|
|
spin_unlock(&delayed_refs->lock);
|
|
return 0;
|
|
}
|
|
|
|
if (!mutex_trylock(&head->mutex)) {
|
|
refcount_inc(&head->refs);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* Mutex was contended, block until it's released and let
|
|
* caller try again
|
|
*/
|
|
mutex_lock(&head->mutex);
|
|
mutex_unlock(&head->mutex);
|
|
btrfs_put_delayed_ref_head(head);
|
|
return -EAGAIN;
|
|
}
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
spin_lock(&head->lock);
|
|
/*
|
|
* XXX: We should replace this with a proper search function in the
|
|
* future.
|
|
*/
|
|
for (node = rb_first(&head->ref_tree); node; node = rb_next(node)) {
|
|
ref = rb_entry(node, struct btrfs_delayed_ref_node, ref_node);
|
|
/* If it's a shared ref we know a cross reference exists */
|
|
if (ref->type != BTRFS_EXTENT_DATA_REF_KEY) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
|
|
data_ref = btrfs_delayed_node_to_data_ref(ref);
|
|
|
|
/*
|
|
* If our ref doesn't match the one we're currently looking at
|
|
* then we have a cross reference.
|
|
*/
|
|
if (data_ref->root != root->root_key.objectid ||
|
|
data_ref->objectid != objectid ||
|
|
data_ref->offset != offset) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&head->lock);
|
|
mutex_unlock(&head->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static noinline int check_committed_ref(struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
u64 objectid, u64 offset, u64 bytenr)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *extent_root = fs_info->extent_root;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_data_ref *ref;
|
|
struct btrfs_extent_inline_ref *iref;
|
|
struct btrfs_extent_item *ei;
|
|
struct btrfs_key key;
|
|
u32 item_size;
|
|
int type;
|
|
int ret;
|
|
|
|
key.objectid = bytenr;
|
|
key.offset = (u64)-1;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
|
|
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
BUG_ON(ret == 0); /* Corruption */
|
|
|
|
ret = -ENOENT;
|
|
if (path->slots[0] == 0)
|
|
goto out;
|
|
|
|
path->slots[0]--;
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
|
|
|
|
if (key.objectid != bytenr || key.type != BTRFS_EXTENT_ITEM_KEY)
|
|
goto out;
|
|
|
|
ret = 1;
|
|
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
if (item_size < sizeof(*ei)) {
|
|
WARN_ON(item_size != sizeof(struct btrfs_extent_item_v0));
|
|
goto out;
|
|
}
|
|
#endif
|
|
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
|
|
|
|
if (item_size != sizeof(*ei) +
|
|
btrfs_extent_inline_ref_size(BTRFS_EXTENT_DATA_REF_KEY))
|
|
goto out;
|
|
|
|
if (btrfs_extent_generation(leaf, ei) <=
|
|
btrfs_root_last_snapshot(&root->root_item))
|
|
goto out;
|
|
|
|
iref = (struct btrfs_extent_inline_ref *)(ei + 1);
|
|
|
|
type = btrfs_get_extent_inline_ref_type(leaf, iref, BTRFS_REF_TYPE_DATA);
|
|
if (type != BTRFS_EXTENT_DATA_REF_KEY)
|
|
goto out;
|
|
|
|
ref = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
if (btrfs_extent_refs(leaf, ei) !=
|
|
btrfs_extent_data_ref_count(leaf, ref) ||
|
|
btrfs_extent_data_ref_root(leaf, ref) !=
|
|
root->root_key.objectid ||
|
|
btrfs_extent_data_ref_objectid(leaf, ref) != objectid ||
|
|
btrfs_extent_data_ref_offset(leaf, ref) != offset)
|
|
goto out;
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_cross_ref_exist(struct btrfs_root *root, u64 objectid, u64 offset,
|
|
u64 bytenr)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
int ret2;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOENT;
|
|
|
|
do {
|
|
ret = check_committed_ref(root, path, objectid,
|
|
offset, bytenr);
|
|
if (ret && ret != -ENOENT)
|
|
goto out;
|
|
|
|
ret2 = check_delayed_ref(root, path, objectid,
|
|
offset, bytenr);
|
|
} while (ret2 == -EAGAIN);
|
|
|
|
if (ret2 && ret2 != -ENOENT) {
|
|
ret = ret2;
|
|
goto out;
|
|
}
|
|
|
|
if (ret != -ENOENT || ret2 != -ENOENT)
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID)
|
|
WARN_ON(ret > 0);
|
|
return ret;
|
|
}
|
|
|
|
static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct extent_buffer *buf,
|
|
int full_backref, int inc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 bytenr;
|
|
u64 num_bytes;
|
|
u64 parent;
|
|
u64 ref_root;
|
|
u32 nritems;
|
|
struct btrfs_key key;
|
|
struct btrfs_file_extent_item *fi;
|
|
int i;
|
|
int level;
|
|
int ret = 0;
|
|
int (*process_func)(struct btrfs_trans_handle *,
|
|
struct btrfs_root *,
|
|
u64, u64, u64, u64, u64, u64);
|
|
|
|
|
|
if (btrfs_is_testing(fs_info))
|
|
return 0;
|
|
|
|
ref_root = btrfs_header_owner(buf);
|
|
nritems = btrfs_header_nritems(buf);
|
|
level = btrfs_header_level(buf);
|
|
|
|
if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state) && level == 0)
|
|
return 0;
|
|
|
|
if (inc)
|
|
process_func = btrfs_inc_extent_ref;
|
|
else
|
|
process_func = btrfs_free_extent;
|
|
|
|
if (full_backref)
|
|
parent = buf->start;
|
|
else
|
|
parent = 0;
|
|
|
|
for (i = 0; i < nritems; i++) {
|
|
if (level == 0) {
|
|
btrfs_item_key_to_cpu(buf, &key, i);
|
|
if (key.type != BTRFS_EXTENT_DATA_KEY)
|
|
continue;
|
|
fi = btrfs_item_ptr(buf, i,
|
|
struct btrfs_file_extent_item);
|
|
if (btrfs_file_extent_type(buf, fi) ==
|
|
BTRFS_FILE_EXTENT_INLINE)
|
|
continue;
|
|
bytenr = btrfs_file_extent_disk_bytenr(buf, fi);
|
|
if (bytenr == 0)
|
|
continue;
|
|
|
|
num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi);
|
|
key.offset -= btrfs_file_extent_offset(buf, fi);
|
|
ret = process_func(trans, root, bytenr, num_bytes,
|
|
parent, ref_root, key.objectid,
|
|
key.offset);
|
|
if (ret)
|
|
goto fail;
|
|
} else {
|
|
bytenr = btrfs_node_blockptr(buf, i);
|
|
num_bytes = fs_info->nodesize;
|
|
ret = process_func(trans, root, bytenr, num_bytes,
|
|
parent, ref_root, level - 1, 0);
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
}
|
|
return 0;
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct extent_buffer *buf, int full_backref)
|
|
{
|
|
return __btrfs_mod_ref(trans, root, buf, full_backref, 1);
|
|
}
|
|
|
|
int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
struct extent_buffer *buf, int full_backref)
|
|
{
|
|
return __btrfs_mod_ref(trans, root, buf, full_backref, 0);
|
|
}
|
|
|
|
static int write_one_cache_group(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_block_group_cache *cache)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *extent_root = fs_info->extent_root;
|
|
unsigned long bi;
|
|
struct extent_buffer *leaf;
|
|
|
|
ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
bi = btrfs_item_ptr_offset(leaf, path->slots[0]);
|
|
write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item));
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
fail:
|
|
btrfs_release_path(path);
|
|
return ret;
|
|
|
|
}
|
|
|
|
static struct btrfs_block_group_cache *
|
|
next_block_group(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_group_cache *cache)
|
|
{
|
|
struct rb_node *node;
|
|
|
|
spin_lock(&fs_info->block_group_cache_lock);
|
|
|
|
/* If our block group was removed, we need a full search. */
|
|
if (RB_EMPTY_NODE(&cache->cache_node)) {
|
|
const u64 next_bytenr = cache->key.objectid + cache->key.offset;
|
|
|
|
spin_unlock(&fs_info->block_group_cache_lock);
|
|
btrfs_put_block_group(cache);
|
|
cache = btrfs_lookup_first_block_group(fs_info, next_bytenr); return cache;
|
|
}
|
|
node = rb_next(&cache->cache_node);
|
|
btrfs_put_block_group(cache);
|
|
if (node) {
|
|
cache = rb_entry(node, struct btrfs_block_group_cache,
|
|
cache_node);
|
|
btrfs_get_block_group(cache);
|
|
} else
|
|
cache = NULL;
|
|
spin_unlock(&fs_info->block_group_cache_lock);
|
|
return cache;
|
|
}
|
|
|
|
static int cache_save_setup(struct btrfs_block_group_cache *block_group,
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
struct inode *inode = NULL;
|
|
struct extent_changeset *data_reserved = NULL;
|
|
u64 alloc_hint = 0;
|
|
int dcs = BTRFS_DC_ERROR;
|
|
u64 num_pages = 0;
|
|
int retries = 0;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* If this block group is smaller than 100 megs don't bother caching the
|
|
* block group.
|
|
*/
|
|
if (block_group->key.offset < (100 * SZ_1M)) {
|
|
spin_lock(&block_group->lock);
|
|
block_group->disk_cache_state = BTRFS_DC_WRITTEN;
|
|
spin_unlock(&block_group->lock);
|
|
return 0;
|
|
}
|
|
|
|
if (trans->aborted)
|
|
return 0;
|
|
again:
|
|
inode = lookup_free_space_inode(fs_info, block_group, path);
|
|
if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) {
|
|
ret = PTR_ERR(inode);
|
|
btrfs_release_path(path);
|
|
goto out;
|
|
}
|
|
|
|
if (IS_ERR(inode)) {
|
|
BUG_ON(retries);
|
|
retries++;
|
|
|
|
if (block_group->ro)
|
|
goto out_free;
|
|
|
|
ret = create_free_space_inode(fs_info, trans, block_group,
|
|
path);
|
|
if (ret)
|
|
goto out_free;
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* We want to set the generation to 0, that way if anything goes wrong
|
|
* from here on out we know not to trust this cache when we load up next
|
|
* time.
|
|
*/
|
|
BTRFS_I(inode)->generation = 0;
|
|
ret = btrfs_update_inode(trans, root, inode);
|
|
if (ret) {
|
|
/*
|
|
* So theoretically we could recover from this, simply set the
|
|
* super cache generation to 0 so we know to invalidate the
|
|
* cache, but then we'd have to keep track of the block groups
|
|
* that fail this way so we know we _have_ to reset this cache
|
|
* before the next commit or risk reading stale cache. So to
|
|
* limit our exposure to horrible edge cases lets just abort the
|
|
* transaction, this only happens in really bad situations
|
|
* anyway.
|
|
*/
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_put;
|
|
}
|
|
WARN_ON(ret);
|
|
|
|
/* We've already setup this transaction, go ahead and exit */
|
|
if (block_group->cache_generation == trans->transid &&
|
|
i_size_read(inode)) {
|
|
dcs = BTRFS_DC_SETUP;
|
|
goto out_put;
|
|
}
|
|
|
|
if (i_size_read(inode) > 0) {
|
|
ret = btrfs_check_trunc_cache_free_space(fs_info,
|
|
&fs_info->global_block_rsv);
|
|
if (ret)
|
|
goto out_put;
|
|
|
|
ret = btrfs_truncate_free_space_cache(trans, NULL, inode);
|
|
if (ret)
|
|
goto out_put;
|
|
}
|
|
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->cached != BTRFS_CACHE_FINISHED ||
|
|
!btrfs_test_opt(fs_info, SPACE_CACHE)) {
|
|
/*
|
|
* don't bother trying to write stuff out _if_
|
|
* a) we're not cached,
|
|
* b) we're with nospace_cache mount option,
|
|
* c) we're with v2 space_cache (FREE_SPACE_TREE).
|
|
*/
|
|
dcs = BTRFS_DC_WRITTEN;
|
|
spin_unlock(&block_group->lock);
|
|
goto out_put;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
|
|
/*
|
|
* We hit an ENOSPC when setting up the cache in this transaction, just
|
|
* skip doing the setup, we've already cleared the cache so we're safe.
|
|
*/
|
|
if (test_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags)) {
|
|
ret = -ENOSPC;
|
|
goto out_put;
|
|
}
|
|
|
|
/*
|
|
* Try to preallocate enough space based on how big the block group is.
|
|
* Keep in mind this has to include any pinned space which could end up
|
|
* taking up quite a bit since it's not folded into the other space
|
|
* cache.
|
|
*/
|
|
num_pages = div_u64(block_group->key.offset, SZ_256M);
|
|
if (!num_pages)
|
|
num_pages = 1;
|
|
|
|
num_pages *= 16;
|
|
num_pages *= PAGE_SIZE;
|
|
|
|
ret = btrfs_check_data_free_space(inode, &data_reserved, 0, num_pages);
|
|
if (ret)
|
|
goto out_put;
|
|
|
|
ret = btrfs_prealloc_file_range_trans(inode, trans, 0, 0, num_pages,
|
|
num_pages, num_pages,
|
|
&alloc_hint);
|
|
/*
|
|
* Our cache requires contiguous chunks so that we don't modify a bunch
|
|
* of metadata or split extents when writing the cache out, which means
|
|
* we can enospc if we are heavily fragmented in addition to just normal
|
|
* out of space conditions. So if we hit this just skip setting up any
|
|
* other block groups for this transaction, maybe we'll unpin enough
|
|
* space the next time around.
|
|
*/
|
|
if (!ret)
|
|
dcs = BTRFS_DC_SETUP;
|
|
else if (ret == -ENOSPC)
|
|
set_bit(BTRFS_TRANS_CACHE_ENOSPC, &trans->transaction->flags);
|
|
|
|
out_put:
|
|
iput(inode);
|
|
out_free:
|
|
btrfs_release_path(path);
|
|
out:
|
|
spin_lock(&block_group->lock);
|
|
if (!ret && dcs == BTRFS_DC_SETUP)
|
|
block_group->cache_generation = trans->transid;
|
|
block_group->disk_cache_state = dcs;
|
|
spin_unlock(&block_group->lock);
|
|
|
|
extent_changeset_free(data_reserved);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group_cache *cache, *tmp;
|
|
struct btrfs_transaction *cur_trans = trans->transaction;
|
|
struct btrfs_path *path;
|
|
|
|
if (list_empty(&cur_trans->dirty_bgs) ||
|
|
!btrfs_test_opt(fs_info, SPACE_CACHE))
|
|
return 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/* Could add new block groups, use _safe just in case */
|
|
list_for_each_entry_safe(cache, tmp, &cur_trans->dirty_bgs,
|
|
dirty_list) {
|
|
if (cache->disk_cache_state == BTRFS_DC_CLEAR)
|
|
cache_save_setup(cache, trans, path);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* transaction commit does final block group cache writeback during a
|
|
* critical section where nothing is allowed to change the FS. This is
|
|
* required in order for the cache to actually match the block group,
|
|
* but can introduce a lot of latency into the commit.
|
|
*
|
|
* So, btrfs_start_dirty_block_groups is here to kick off block group
|
|
* cache IO. There's a chance we'll have to redo some of it if the
|
|
* block group changes again during the commit, but it greatly reduces
|
|
* the commit latency by getting rid of the easy block groups while
|
|
* we're still allowing others to join the commit.
|
|
*/
|
|
int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
struct btrfs_transaction *cur_trans = trans->transaction;
|
|
int ret = 0;
|
|
int should_put;
|
|
struct btrfs_path *path = NULL;
|
|
LIST_HEAD(dirty);
|
|
struct list_head *io = &cur_trans->io_bgs;
|
|
int num_started = 0;
|
|
int loops = 0;
|
|
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
if (list_empty(&cur_trans->dirty_bgs)) {
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
return 0;
|
|
}
|
|
list_splice_init(&cur_trans->dirty_bgs, &dirty);
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
|
|
again:
|
|
/*
|
|
* make sure all the block groups on our dirty list actually
|
|
* exist
|
|
*/
|
|
btrfs_create_pending_block_groups(trans, fs_info);
|
|
|
|
if (!path) {
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* cache_write_mutex is here only to save us from balance or automatic
|
|
* removal of empty block groups deleting this block group while we are
|
|
* writing out the cache
|
|
*/
|
|
mutex_lock(&trans->transaction->cache_write_mutex);
|
|
while (!list_empty(&dirty)) {
|
|
cache = list_first_entry(&dirty,
|
|
struct btrfs_block_group_cache,
|
|
dirty_list);
|
|
/*
|
|
* this can happen if something re-dirties a block
|
|
* group that is already under IO. Just wait for it to
|
|
* finish and then do it all again
|
|
*/
|
|
if (!list_empty(&cache->io_list)) {
|
|
list_del_init(&cache->io_list);
|
|
btrfs_wait_cache_io(trans, cache, path);
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
|
|
/*
|
|
* btrfs_wait_cache_io uses the cache->dirty_list to decide
|
|
* if it should update the cache_state. Don't delete
|
|
* until after we wait.
|
|
*
|
|
* Since we're not running in the commit critical section
|
|
* we need the dirty_bgs_lock to protect from update_block_group
|
|
*/
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
list_del_init(&cache->dirty_list);
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
|
|
should_put = 1;
|
|
|
|
cache_save_setup(cache, trans, path);
|
|
|
|
if (cache->disk_cache_state == BTRFS_DC_SETUP) {
|
|
cache->io_ctl.inode = NULL;
|
|
ret = btrfs_write_out_cache(fs_info, trans,
|
|
cache, path);
|
|
if (ret == 0 && cache->io_ctl.inode) {
|
|
num_started++;
|
|
should_put = 0;
|
|
|
|
/*
|
|
* the cache_write_mutex is protecting
|
|
* the io_list
|
|
*/
|
|
list_add_tail(&cache->io_list, io);
|
|
} else {
|
|
/*
|
|
* if we failed to write the cache, the
|
|
* generation will be bad and life goes on
|
|
*/
|
|
ret = 0;
|
|
}
|
|
}
|
|
if (!ret) {
|
|
ret = write_one_cache_group(trans, fs_info,
|
|
path, cache);
|
|
/*
|
|
* Our block group might still be attached to the list
|
|
* of new block groups in the transaction handle of some
|
|
* other task (struct btrfs_trans_handle->new_bgs). This
|
|
* means its block group item isn't yet in the extent
|
|
* tree. If this happens ignore the error, as we will
|
|
* try again later in the critical section of the
|
|
* transaction commit.
|
|
*/
|
|
if (ret == -ENOENT) {
|
|
ret = 0;
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
if (list_empty(&cache->dirty_list)) {
|
|
list_add_tail(&cache->dirty_list,
|
|
&cur_trans->dirty_bgs);
|
|
btrfs_get_block_group(cache);
|
|
}
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
} else if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
}
|
|
}
|
|
|
|
/* if its not on the io list, we need to put the block group */
|
|
if (should_put)
|
|
btrfs_put_block_group(cache);
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
/*
|
|
* Avoid blocking other tasks for too long. It might even save
|
|
* us from writing caches for block groups that are going to be
|
|
* removed.
|
|
*/
|
|
mutex_unlock(&trans->transaction->cache_write_mutex);
|
|
mutex_lock(&trans->transaction->cache_write_mutex);
|
|
}
|
|
mutex_unlock(&trans->transaction->cache_write_mutex);
|
|
|
|
/*
|
|
* go through delayed refs for all the stuff we've just kicked off
|
|
* and then loop back (just once)
|
|
*/
|
|
ret = btrfs_run_delayed_refs(trans, fs_info, 0);
|
|
if (!ret && loops == 0) {
|
|
loops++;
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
list_splice_init(&cur_trans->dirty_bgs, &dirty);
|
|
/*
|
|
* dirty_bgs_lock protects us from concurrent block group
|
|
* deletes too (not just cache_write_mutex).
|
|
*/
|
|
if (!list_empty(&dirty)) {
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
goto again;
|
|
}
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
} else if (ret < 0) {
|
|
btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
struct btrfs_transaction *cur_trans = trans->transaction;
|
|
int ret = 0;
|
|
int should_put;
|
|
struct btrfs_path *path;
|
|
struct list_head *io = &cur_trans->io_bgs;
|
|
int num_started = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Even though we are in the critical section of the transaction commit,
|
|
* we can still have concurrent tasks adding elements to this
|
|
* transaction's list of dirty block groups. These tasks correspond to
|
|
* endio free space workers started when writeback finishes for a
|
|
* space cache, which run inode.c:btrfs_finish_ordered_io(), and can
|
|
* allocate new block groups as a result of COWing nodes of the root
|
|
* tree when updating the free space inode. The writeback for the space
|
|
* caches is triggered by an earlier call to
|
|
* btrfs_start_dirty_block_groups() and iterations of the following
|
|
* loop.
|
|
* Also we want to do the cache_save_setup first and then run the
|
|
* delayed refs to make sure we have the best chance at doing this all
|
|
* in one shot.
|
|
*/
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
while (!list_empty(&cur_trans->dirty_bgs)) {
|
|
cache = list_first_entry(&cur_trans->dirty_bgs,
|
|
struct btrfs_block_group_cache,
|
|
dirty_list);
|
|
|
|
/*
|
|
* this can happen if cache_save_setup re-dirties a block
|
|
* group that is already under IO. Just wait for it to
|
|
* finish and then do it all again
|
|
*/
|
|
if (!list_empty(&cache->io_list)) {
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
list_del_init(&cache->io_list);
|
|
btrfs_wait_cache_io(trans, cache, path);
|
|
btrfs_put_block_group(cache);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
|
|
/*
|
|
* don't remove from the dirty list until after we've waited
|
|
* on any pending IO
|
|
*/
|
|
list_del_init(&cache->dirty_list);
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
should_put = 1;
|
|
|
|
cache_save_setup(cache, trans, path);
|
|
|
|
if (!ret)
|
|
ret = btrfs_run_delayed_refs(trans, fs_info,
|
|
(unsigned long) -1);
|
|
|
|
if (!ret && cache->disk_cache_state == BTRFS_DC_SETUP) {
|
|
cache->io_ctl.inode = NULL;
|
|
ret = btrfs_write_out_cache(fs_info, trans,
|
|
cache, path);
|
|
if (ret == 0 && cache->io_ctl.inode) {
|
|
num_started++;
|
|
should_put = 0;
|
|
list_add_tail(&cache->io_list, io);
|
|
} else {
|
|
/*
|
|
* if we failed to write the cache, the
|
|
* generation will be bad and life goes on
|
|
*/
|
|
ret = 0;
|
|
}
|
|
}
|
|
if (!ret) {
|
|
ret = write_one_cache_group(trans, fs_info,
|
|
path, cache);
|
|
/*
|
|
* One of the free space endio workers might have
|
|
* created a new block group while updating a free space
|
|
* cache's inode (at inode.c:btrfs_finish_ordered_io())
|
|
* and hasn't released its transaction handle yet, in
|
|
* which case the new block group is still attached to
|
|
* its transaction handle and its creation has not
|
|
* finished yet (no block group item in the extent tree
|
|
* yet, etc). If this is the case, wait for all free
|
|
* space endio workers to finish and retry. This is a
|
|
* a very rare case so no need for a more efficient and
|
|
* complex approach.
|
|
*/
|
|
if (ret == -ENOENT) {
|
|
wait_event(cur_trans->writer_wait,
|
|
atomic_read(&cur_trans->num_writers) == 1);
|
|
ret = write_one_cache_group(trans, fs_info,
|
|
path, cache);
|
|
}
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
}
|
|
|
|
/* if its not on the io list, we need to put the block group */
|
|
if (should_put)
|
|
btrfs_put_block_group(cache);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
|
|
while (!list_empty(io)) {
|
|
cache = list_first_entry(io, struct btrfs_block_group_cache,
|
|
io_list);
|
|
list_del_init(&cache->io_list);
|
|
btrfs_wait_cache_io(trans, cache, path);
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_block_group_cache *block_group;
|
|
int readonly = 0;
|
|
|
|
block_group = btrfs_lookup_block_group(fs_info, bytenr);
|
|
if (!block_group || block_group->ro)
|
|
readonly = 1;
|
|
if (block_group)
|
|
btrfs_put_block_group(block_group);
|
|
return readonly;
|
|
}
|
|
|
|
bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_block_group_cache *bg;
|
|
bool ret = true;
|
|
|
|
bg = btrfs_lookup_block_group(fs_info, bytenr);
|
|
if (!bg)
|
|
return false;
|
|
|
|
spin_lock(&bg->lock);
|
|
if (bg->ro)
|
|
ret = false;
|
|
else
|
|
atomic_inc(&bg->nocow_writers);
|
|
spin_unlock(&bg->lock);
|
|
|
|
/* no put on block group, done by btrfs_dec_nocow_writers */
|
|
if (!ret)
|
|
btrfs_put_block_group(bg);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_block_group_cache *bg;
|
|
|
|
bg = btrfs_lookup_block_group(fs_info, bytenr);
|
|
ASSERT(bg);
|
|
if (atomic_dec_and_test(&bg->nocow_writers))
|
|
wake_up_atomic_t(&bg->nocow_writers);
|
|
/*
|
|
* Once for our lookup and once for the lookup done by a previous call
|
|
* to btrfs_inc_nocow_writers()
|
|
*/
|
|
btrfs_put_block_group(bg);
|
|
btrfs_put_block_group(bg);
|
|
}
|
|
|
|
void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg)
|
|
{
|
|
wait_on_atomic_t(&bg->nocow_writers, atomic_t_wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
}
|
|
|
|
static const char *alloc_name(u64 flags)
|
|
{
|
|
switch (flags) {
|
|
case BTRFS_BLOCK_GROUP_METADATA|BTRFS_BLOCK_GROUP_DATA:
|
|
return "mixed";
|
|
case BTRFS_BLOCK_GROUP_METADATA:
|
|
return "metadata";
|
|
case BTRFS_BLOCK_GROUP_DATA:
|
|
return "data";
|
|
case BTRFS_BLOCK_GROUP_SYSTEM:
|
|
return "system";
|
|
default:
|
|
WARN_ON(1);
|
|
return "invalid-combination";
|
|
};
|
|
}
|
|
|
|
static int create_space_info(struct btrfs_fs_info *info, u64 flags,
|
|
struct btrfs_space_info **new)
|
|
{
|
|
|
|
struct btrfs_space_info *space_info;
|
|
int i;
|
|
int ret;
|
|
|
|
space_info = kzalloc(sizeof(*space_info), GFP_NOFS);
|
|
if (!space_info)
|
|
return -ENOMEM;
|
|
|
|
ret = percpu_counter_init(&space_info->total_bytes_pinned, 0,
|
|
GFP_KERNEL);
|
|
if (ret) {
|
|
kfree(space_info);
|
|
return ret;
|
|
}
|
|
|
|
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++)
|
|
INIT_LIST_HEAD(&space_info->block_groups[i]);
|
|
init_rwsem(&space_info->groups_sem);
|
|
spin_lock_init(&space_info->lock);
|
|
space_info->flags = flags & BTRFS_BLOCK_GROUP_TYPE_MASK;
|
|
space_info->force_alloc = CHUNK_ALLOC_NO_FORCE;
|
|
init_waitqueue_head(&space_info->wait);
|
|
INIT_LIST_HEAD(&space_info->ro_bgs);
|
|
INIT_LIST_HEAD(&space_info->tickets);
|
|
INIT_LIST_HEAD(&space_info->priority_tickets);
|
|
|
|
ret = kobject_init_and_add(&space_info->kobj, &space_info_ktype,
|
|
info->space_info_kobj, "%s",
|
|
alloc_name(space_info->flags));
|
|
if (ret) {
|
|
percpu_counter_destroy(&space_info->total_bytes_pinned);
|
|
kfree(space_info);
|
|
return ret;
|
|
}
|
|
|
|
*new = space_info;
|
|
list_add_rcu(&space_info->list, &info->space_info);
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA)
|
|
info->data_sinfo = space_info;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void update_space_info(struct btrfs_fs_info *info, u64 flags,
|
|
u64 total_bytes, u64 bytes_used,
|
|
u64 bytes_readonly,
|
|
struct btrfs_space_info **space_info)
|
|
{
|
|
struct btrfs_space_info *found;
|
|
int factor;
|
|
|
|
if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID10))
|
|
factor = 2;
|
|
else
|
|
factor = 1;
|
|
|
|
found = __find_space_info(info, flags);
|
|
ASSERT(found);
|
|
spin_lock(&found->lock);
|
|
found->total_bytes += total_bytes;
|
|
found->disk_total += total_bytes * factor;
|
|
found->bytes_used += bytes_used;
|
|
found->disk_used += bytes_used * factor;
|
|
found->bytes_readonly += bytes_readonly;
|
|
if (total_bytes > 0)
|
|
found->full = 0;
|
|
space_info_add_new_bytes(info, found, total_bytes -
|
|
bytes_used - bytes_readonly);
|
|
spin_unlock(&found->lock);
|
|
*space_info = found;
|
|
}
|
|
|
|
static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
|
|
{
|
|
u64 extra_flags = chunk_to_extended(flags) &
|
|
BTRFS_EXTENDED_PROFILE_MASK;
|
|
|
|
write_seqlock(&fs_info->profiles_lock);
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA)
|
|
fs_info->avail_data_alloc_bits |= extra_flags;
|
|
if (flags & BTRFS_BLOCK_GROUP_METADATA)
|
|
fs_info->avail_metadata_alloc_bits |= extra_flags;
|
|
if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
|
|
fs_info->avail_system_alloc_bits |= extra_flags;
|
|
write_sequnlock(&fs_info->profiles_lock);
|
|
}
|
|
|
|
/*
|
|
* returns target flags in extended format or 0 if restripe for this
|
|
* chunk_type is not in progress
|
|
*
|
|
* should be called with either volume_mutex or balance_lock held
|
|
*/
|
|
static u64 get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags)
|
|
{
|
|
struct btrfs_balance_control *bctl = fs_info->balance_ctl;
|
|
u64 target = 0;
|
|
|
|
if (!bctl)
|
|
return 0;
|
|
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA &&
|
|
bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) {
|
|
target = BTRFS_BLOCK_GROUP_DATA | bctl->data.target;
|
|
} else if (flags & BTRFS_BLOCK_GROUP_SYSTEM &&
|
|
bctl->sys.flags & BTRFS_BALANCE_ARGS_CONVERT) {
|
|
target = BTRFS_BLOCK_GROUP_SYSTEM | bctl->sys.target;
|
|
} else if (flags & BTRFS_BLOCK_GROUP_METADATA &&
|
|
bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) {
|
|
target = BTRFS_BLOCK_GROUP_METADATA | bctl->meta.target;
|
|
}
|
|
|
|
return target;
|
|
}
|
|
|
|
/*
|
|
* @flags: available profiles in extended format (see ctree.h)
|
|
*
|
|
* Returns reduced profile in chunk format. If profile changing is in
|
|
* progress (either running or paused) picks the target profile (if it's
|
|
* already available), otherwise falls back to plain reducing.
|
|
*/
|
|
static u64 btrfs_reduce_alloc_profile(struct btrfs_fs_info *fs_info, u64 flags)
|
|
{
|
|
u64 num_devices = fs_info->fs_devices->rw_devices;
|
|
u64 target;
|
|
u64 raid_type;
|
|
u64 allowed = 0;
|
|
|
|
/*
|
|
* see if restripe for this chunk_type is in progress, if so
|
|
* try to reduce to the target profile
|
|
*/
|
|
spin_lock(&fs_info->balance_lock);
|
|
target = get_restripe_target(fs_info, flags);
|
|
if (target) {
|
|
/* pick target profile only if it's already available */
|
|
if ((flags & target) & BTRFS_EXTENDED_PROFILE_MASK) {
|
|
spin_unlock(&fs_info->balance_lock);
|
|
return extended_to_chunk(target);
|
|
}
|
|
}
|
|
spin_unlock(&fs_info->balance_lock);
|
|
|
|
/* First, mask out the RAID levels which aren't possible */
|
|
for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
|
|
if (num_devices >= btrfs_raid_array[raid_type].devs_min)
|
|
allowed |= btrfs_raid_group[raid_type];
|
|
}
|
|
allowed &= flags;
|
|
|
|
if (allowed & BTRFS_BLOCK_GROUP_RAID6)
|
|
allowed = BTRFS_BLOCK_GROUP_RAID6;
|
|
else if (allowed & BTRFS_BLOCK_GROUP_RAID5)
|
|
allowed = BTRFS_BLOCK_GROUP_RAID5;
|
|
else if (allowed & BTRFS_BLOCK_GROUP_RAID10)
|
|
allowed = BTRFS_BLOCK_GROUP_RAID10;
|
|
else if (allowed & BTRFS_BLOCK_GROUP_RAID1)
|
|
allowed = BTRFS_BLOCK_GROUP_RAID1;
|
|
else if (allowed & BTRFS_BLOCK_GROUP_RAID0)
|
|
allowed = BTRFS_BLOCK_GROUP_RAID0;
|
|
|
|
flags &= ~BTRFS_BLOCK_GROUP_PROFILE_MASK;
|
|
|
|
return extended_to_chunk(flags | allowed);
|
|
}
|
|
|
|
static u64 get_alloc_profile(struct btrfs_fs_info *fs_info, u64 orig_flags)
|
|
{
|
|
unsigned seq;
|
|
u64 flags;
|
|
|
|
do {
|
|
flags = orig_flags;
|
|
seq = read_seqbegin(&fs_info->profiles_lock);
|
|
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA)
|
|
flags |= fs_info->avail_data_alloc_bits;
|
|
else if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
|
|
flags |= fs_info->avail_system_alloc_bits;
|
|
else if (flags & BTRFS_BLOCK_GROUP_METADATA)
|
|
flags |= fs_info->avail_metadata_alloc_bits;
|
|
} while (read_seqretry(&fs_info->profiles_lock, seq));
|
|
|
|
return btrfs_reduce_alloc_profile(fs_info, flags);
|
|
}
|
|
|
|
static u64 get_alloc_profile_by_root(struct btrfs_root *root, int data)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 flags;
|
|
u64 ret;
|
|
|
|
if (data)
|
|
flags = BTRFS_BLOCK_GROUP_DATA;
|
|
else if (root == fs_info->chunk_root)
|
|
flags = BTRFS_BLOCK_GROUP_SYSTEM;
|
|
else
|
|
flags = BTRFS_BLOCK_GROUP_METADATA;
|
|
|
|
ret = get_alloc_profile(fs_info, flags);
|
|
return ret;
|
|
}
|
|
|
|
u64 btrfs_data_alloc_profile(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_DATA);
|
|
}
|
|
|
|
u64 btrfs_metadata_alloc_profile(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
}
|
|
|
|
u64 btrfs_system_alloc_profile(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return get_alloc_profile(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
|
|
}
|
|
|
|
static u64 btrfs_space_info_used(struct btrfs_space_info *s_info,
|
|
bool may_use_included)
|
|
{
|
|
ASSERT(s_info);
|
|
return s_info->bytes_used + s_info->bytes_reserved +
|
|
s_info->bytes_pinned + s_info->bytes_readonly +
|
|
(may_use_included ? s_info->bytes_may_use : 0);
|
|
}
|
|
|
|
int btrfs_alloc_data_chunk_ondemand(struct btrfs_inode *inode, u64 bytes)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_space_info *data_sinfo = fs_info->data_sinfo;
|
|
u64 used;
|
|
int ret = 0;
|
|
int need_commit = 2;
|
|
int have_pinned_space;
|
|
|
|
/* make sure bytes are sectorsize aligned */
|
|
bytes = ALIGN(bytes, fs_info->sectorsize);
|
|
|
|
if (btrfs_is_free_space_inode(inode)) {
|
|
need_commit = 0;
|
|
ASSERT(current->journal_info);
|
|
}
|
|
|
|
again:
|
|
/* make sure we have enough space to handle the data first */
|
|
spin_lock(&data_sinfo->lock);
|
|
used = btrfs_space_info_used(data_sinfo, true);
|
|
|
|
if (used + bytes > data_sinfo->total_bytes) {
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
/*
|
|
* if we don't have enough free bytes in this space then we need
|
|
* to alloc a new chunk.
|
|
*/
|
|
if (!data_sinfo->full) {
|
|
u64 alloc_target;
|
|
|
|
data_sinfo->force_alloc = CHUNK_ALLOC_FORCE;
|
|
spin_unlock(&data_sinfo->lock);
|
|
|
|
alloc_target = btrfs_data_alloc_profile(fs_info);
|
|
/*
|
|
* It is ugly that we don't call nolock join
|
|
* transaction for the free space inode case here.
|
|
* But it is safe because we only do the data space
|
|
* reservation for the free space cache in the
|
|
* transaction context, the common join transaction
|
|
* just increase the counter of the current transaction
|
|
* handler, doesn't try to acquire the trans_lock of
|
|
* the fs.
|
|
*/
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
ret = do_chunk_alloc(trans, fs_info, alloc_target,
|
|
CHUNK_ALLOC_NO_FORCE);
|
|
btrfs_end_transaction(trans);
|
|
if (ret < 0) {
|
|
if (ret != -ENOSPC)
|
|
return ret;
|
|
else {
|
|
have_pinned_space = 1;
|
|
goto commit_trans;
|
|
}
|
|
}
|
|
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* If we don't have enough pinned space to deal with this
|
|
* allocation, and no removed chunk in current transaction,
|
|
* don't bother committing the transaction.
|
|
*/
|
|
have_pinned_space = percpu_counter_compare(
|
|
&data_sinfo->total_bytes_pinned,
|
|
used + bytes - data_sinfo->total_bytes);
|
|
spin_unlock(&data_sinfo->lock);
|
|
|
|
/* commit the current transaction and try again */
|
|
commit_trans:
|
|
if (need_commit &&
|
|
!atomic_read(&fs_info->open_ioctl_trans)) {
|
|
need_commit--;
|
|
|
|
if (need_commit > 0) {
|
|
btrfs_start_delalloc_roots(fs_info, 0, -1);
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0,
|
|
(u64)-1);
|
|
}
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
if (have_pinned_space >= 0 ||
|
|
test_bit(BTRFS_TRANS_HAVE_FREE_BGS,
|
|
&trans->transaction->flags) ||
|
|
need_commit > 0) {
|
|
ret = btrfs_commit_transaction(trans);
|
|
if (ret)
|
|
return ret;
|
|
/*
|
|
* The cleaner kthread might still be doing iput
|
|
* operations. Wait for it to finish so that
|
|
* more space is released.
|
|
*/
|
|
mutex_lock(&fs_info->cleaner_delayed_iput_mutex);
|
|
mutex_unlock(&fs_info->cleaner_delayed_iput_mutex);
|
|
goto again;
|
|
} else {
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
}
|
|
|
|
trace_btrfs_space_reservation(fs_info,
|
|
"space_info:enospc",
|
|
data_sinfo->flags, bytes, 1);
|
|
return -ENOSPC;
|
|
}
|
|
data_sinfo->bytes_may_use += bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
data_sinfo->flags, bytes, 1);
|
|
spin_unlock(&data_sinfo->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_check_data_free_space(struct inode *inode,
|
|
struct extent_changeset **reserved, u64 start, u64 len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
int ret;
|
|
|
|
/* align the range */
|
|
len = round_up(start + len, fs_info->sectorsize) -
|
|
round_down(start, fs_info->sectorsize);
|
|
start = round_down(start, fs_info->sectorsize);
|
|
|
|
ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), len);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Use new btrfs_qgroup_reserve_data to reserve precious data space. */
|
|
ret = btrfs_qgroup_reserve_data(inode, reserved, start, len);
|
|
if (ret < 0)
|
|
btrfs_free_reserved_data_space_noquota(inode, start, len);
|
|
else
|
|
ret = 0;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called if we need to clear a data reservation for this inode
|
|
* Normally in a error case.
|
|
*
|
|
* This one will *NOT* use accurate qgroup reserved space API, just for case
|
|
* which we can't sleep and is sure it won't affect qgroup reserved space.
|
|
* Like clear_bit_hook().
|
|
*/
|
|
void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
|
|
u64 len)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
struct btrfs_space_info *data_sinfo;
|
|
|
|
/* Make sure the range is aligned to sectorsize */
|
|
len = round_up(start + len, fs_info->sectorsize) -
|
|
round_down(start, fs_info->sectorsize);
|
|
start = round_down(start, fs_info->sectorsize);
|
|
|
|
data_sinfo = fs_info->data_sinfo;
|
|
spin_lock(&data_sinfo->lock);
|
|
if (WARN_ON(data_sinfo->bytes_may_use < len))
|
|
data_sinfo->bytes_may_use = 0;
|
|
else
|
|
data_sinfo->bytes_may_use -= len;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
data_sinfo->flags, len, 0);
|
|
spin_unlock(&data_sinfo->lock);
|
|
}
|
|
|
|
/*
|
|
* Called if we need to clear a data reservation for this inode
|
|
* Normally in a error case.
|
|
*
|
|
* This one will handle the per-inode data rsv map for accurate reserved
|
|
* space framework.
|
|
*/
|
|
void btrfs_free_reserved_data_space(struct inode *inode,
|
|
struct extent_changeset *reserved, u64 start, u64 len)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(inode)->root;
|
|
|
|
/* Make sure the range is aligned to sectorsize */
|
|
len = round_up(start + len, root->fs_info->sectorsize) -
|
|
round_down(start, root->fs_info->sectorsize);
|
|
start = round_down(start, root->fs_info->sectorsize);
|
|
|
|
btrfs_free_reserved_data_space_noquota(inode, start, len);
|
|
btrfs_qgroup_free_data(inode, reserved, start, len);
|
|
}
|
|
|
|
static void force_metadata_allocation(struct btrfs_fs_info *info)
|
|
{
|
|
struct list_head *head = &info->space_info;
|
|
struct btrfs_space_info *found;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(found, head, list) {
|
|
if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
|
|
found->force_alloc = CHUNK_ALLOC_FORCE;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static inline u64 calc_global_rsv_need_space(struct btrfs_block_rsv *global)
|
|
{
|
|
return (global->size << 1);
|
|
}
|
|
|
|
static int should_alloc_chunk(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *sinfo, int force)
|
|
{
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
u64 bytes_used = btrfs_space_info_used(sinfo, false);
|
|
u64 thresh;
|
|
|
|
if (force == CHUNK_ALLOC_FORCE)
|
|
return 1;
|
|
|
|
/*
|
|
* We need to take into account the global rsv because for all intents
|
|
* and purposes it's used space. Don't worry about locking the
|
|
* global_rsv, it doesn't change except when the transaction commits.
|
|
*/
|
|
if (sinfo->flags & BTRFS_BLOCK_GROUP_METADATA)
|
|
bytes_used += calc_global_rsv_need_space(global_rsv);
|
|
|
|
/*
|
|
* in limited mode, we want to have some free space up to
|
|
* about 1% of the FS size.
|
|
*/
|
|
if (force == CHUNK_ALLOC_LIMITED) {
|
|
thresh = btrfs_super_total_bytes(fs_info->super_copy);
|
|
thresh = max_t(u64, SZ_64M, div_factor_fine(thresh, 1));
|
|
|
|
if (sinfo->total_bytes - bytes_used < thresh)
|
|
return 1;
|
|
}
|
|
|
|
if (bytes_used + SZ_2M < div_factor(sinfo->total_bytes, 8))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static u64 get_profile_num_devs(struct btrfs_fs_info *fs_info, u64 type)
|
|
{
|
|
u64 num_dev;
|
|
|
|
if (type & (BTRFS_BLOCK_GROUP_RAID10 |
|
|
BTRFS_BLOCK_GROUP_RAID0 |
|
|
BTRFS_BLOCK_GROUP_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6))
|
|
num_dev = fs_info->fs_devices->rw_devices;
|
|
else if (type & BTRFS_BLOCK_GROUP_RAID1)
|
|
num_dev = 2;
|
|
else
|
|
num_dev = 1; /* DUP or single */
|
|
|
|
return num_dev;
|
|
}
|
|
|
|
/*
|
|
* If @is_allocation is true, reserve space in the system space info necessary
|
|
* for allocating a chunk, otherwise if it's false, reserve space necessary for
|
|
* removing a chunk.
|
|
*/
|
|
void check_system_chunk(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 type)
|
|
{
|
|
struct btrfs_space_info *info;
|
|
u64 left;
|
|
u64 thresh;
|
|
int ret = 0;
|
|
u64 num_devs;
|
|
|
|
/*
|
|
* Needed because we can end up allocating a system chunk and for an
|
|
* atomic and race free space reservation in the chunk block reserve.
|
|
*/
|
|
ASSERT(mutex_is_locked(&fs_info->chunk_mutex));
|
|
|
|
info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
|
|
spin_lock(&info->lock);
|
|
left = info->total_bytes - btrfs_space_info_used(info, true);
|
|
spin_unlock(&info->lock);
|
|
|
|
num_devs = get_profile_num_devs(fs_info, type);
|
|
|
|
/* num_devs device items to update and 1 chunk item to add or remove */
|
|
thresh = btrfs_calc_trunc_metadata_size(fs_info, num_devs) +
|
|
btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
|
|
if (left < thresh && btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
|
|
btrfs_info(fs_info, "left=%llu, need=%llu, flags=%llu",
|
|
left, thresh, type);
|
|
dump_space_info(fs_info, info, 0, 0);
|
|
}
|
|
|
|
if (left < thresh) {
|
|
u64 flags = btrfs_system_alloc_profile(fs_info);
|
|
|
|
/*
|
|
* Ignore failure to create system chunk. We might end up not
|
|
* needing it, as we might not need to COW all nodes/leafs from
|
|
* the paths we visit in the chunk tree (they were already COWed
|
|
* or created in the current transaction for example).
|
|
*/
|
|
ret = btrfs_alloc_chunk(trans, fs_info, flags);
|
|
}
|
|
|
|
if (!ret) {
|
|
ret = btrfs_block_rsv_add(fs_info->chunk_root,
|
|
&fs_info->chunk_block_rsv,
|
|
thresh, BTRFS_RESERVE_NO_FLUSH);
|
|
if (!ret)
|
|
trans->chunk_bytes_reserved += thresh;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If force is CHUNK_ALLOC_FORCE:
|
|
* - return 1 if it successfully allocates a chunk,
|
|
* - return errors including -ENOSPC otherwise.
|
|
* If force is NOT CHUNK_ALLOC_FORCE:
|
|
* - return 0 if it doesn't need to allocate a new chunk,
|
|
* - return 1 if it successfully allocates a chunk,
|
|
* - return errors including -ENOSPC otherwise.
|
|
*/
|
|
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 flags, int force)
|
|
{
|
|
struct btrfs_space_info *space_info;
|
|
int wait_for_alloc = 0;
|
|
int ret = 0;
|
|
|
|
/* Don't re-enter if we're already allocating a chunk */
|
|
if (trans->allocating_chunk)
|
|
return -ENOSPC;
|
|
|
|
space_info = __find_space_info(fs_info, flags);
|
|
if (!space_info) {
|
|
ret = create_space_info(fs_info, flags, &space_info);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
again:
|
|
spin_lock(&space_info->lock);
|
|
if (force < space_info->force_alloc)
|
|
force = space_info->force_alloc;
|
|
if (space_info->full) {
|
|
if (should_alloc_chunk(fs_info, space_info, force))
|
|
ret = -ENOSPC;
|
|
else
|
|
ret = 0;
|
|
spin_unlock(&space_info->lock);
|
|
return ret;
|
|
}
|
|
|
|
if (!should_alloc_chunk(fs_info, space_info, force)) {
|
|
spin_unlock(&space_info->lock);
|
|
return 0;
|
|
} else if (space_info->chunk_alloc) {
|
|
wait_for_alloc = 1;
|
|
} else {
|
|
space_info->chunk_alloc = 1;
|
|
}
|
|
|
|
spin_unlock(&space_info->lock);
|
|
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
|
|
/*
|
|
* The chunk_mutex is held throughout the entirety of a chunk
|
|
* allocation, so once we've acquired the chunk_mutex we know that the
|
|
* other guy is done and we need to recheck and see if we should
|
|
* allocate.
|
|
*/
|
|
if (wait_for_alloc) {
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
wait_for_alloc = 0;
|
|
goto again;
|
|
}
|
|
|
|
trans->allocating_chunk = true;
|
|
|
|
/*
|
|
* If we have mixed data/metadata chunks we want to make sure we keep
|
|
* allocating mixed chunks instead of individual chunks.
|
|
*/
|
|
if (btrfs_mixed_space_info(space_info))
|
|
flags |= (BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA);
|
|
|
|
/*
|
|
* if we're doing a data chunk, go ahead and make sure that
|
|
* we keep a reasonable number of metadata chunks allocated in the
|
|
* FS as well.
|
|
*/
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) {
|
|
fs_info->data_chunk_allocations++;
|
|
if (!(fs_info->data_chunk_allocations %
|
|
fs_info->metadata_ratio))
|
|
force_metadata_allocation(fs_info);
|
|
}
|
|
|
|
/*
|
|
* Check if we have enough space in SYSTEM chunk because we may need
|
|
* to update devices.
|
|
*/
|
|
check_system_chunk(trans, fs_info, flags);
|
|
|
|
ret = btrfs_alloc_chunk(trans, fs_info, flags);
|
|
trans->allocating_chunk = false;
|
|
|
|
spin_lock(&space_info->lock);
|
|
if (ret < 0 && ret != -ENOSPC)
|
|
goto out;
|
|
if (ret)
|
|
space_info->full = 1;
|
|
else
|
|
ret = 1;
|
|
|
|
space_info->force_alloc = CHUNK_ALLOC_NO_FORCE;
|
|
out:
|
|
space_info->chunk_alloc = 0;
|
|
spin_unlock(&space_info->lock);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
/*
|
|
* When we allocate a new chunk we reserve space in the chunk block
|
|
* reserve to make sure we can COW nodes/leafs in the chunk tree or
|
|
* add new nodes/leafs to it if we end up needing to do it when
|
|
* inserting the chunk item and updating device items as part of the
|
|
* second phase of chunk allocation, performed by
|
|
* btrfs_finish_chunk_alloc(). So make sure we don't accumulate a
|
|
* large number of new block groups to create in our transaction
|
|
* handle's new_bgs list to avoid exhausting the chunk block reserve
|
|
* in extreme cases - like having a single transaction create many new
|
|
* block groups when starting to write out the free space caches of all
|
|
* the block groups that were made dirty during the lifetime of the
|
|
* transaction.
|
|
*/
|
|
if (trans->can_flush_pending_bgs &&
|
|
trans->chunk_bytes_reserved >= (u64)SZ_2M) {
|
|
btrfs_create_pending_block_groups(trans, fs_info);
|
|
btrfs_trans_release_chunk_metadata(trans);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int can_overcommit(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info, u64 bytes,
|
|
enum btrfs_reserve_flush_enum flush,
|
|
bool system_chunk)
|
|
{
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
u64 profile;
|
|
u64 space_size;
|
|
u64 avail;
|
|
u64 used;
|
|
|
|
/* Don't overcommit when in mixed mode. */
|
|
if (space_info->flags & BTRFS_BLOCK_GROUP_DATA)
|
|
return 0;
|
|
|
|
if (system_chunk)
|
|
profile = btrfs_system_alloc_profile(fs_info);
|
|
else
|
|
profile = btrfs_metadata_alloc_profile(fs_info);
|
|
|
|
used = btrfs_space_info_used(space_info, false);
|
|
|
|
/*
|
|
* We only want to allow over committing if we have lots of actual space
|
|
* free, but if we don't have enough space to handle the global reserve
|
|
* space then we could end up having a real enospc problem when trying
|
|
* to allocate a chunk or some other such important allocation.
|
|
*/
|
|
spin_lock(&global_rsv->lock);
|
|
space_size = calc_global_rsv_need_space(global_rsv);
|
|
spin_unlock(&global_rsv->lock);
|
|
if (used + space_size >= space_info->total_bytes)
|
|
return 0;
|
|
|
|
used += space_info->bytes_may_use;
|
|
|
|
avail = atomic64_read(&fs_info->free_chunk_space);
|
|
|
|
/*
|
|
* If we have dup, raid1 or raid10 then only half of the free
|
|
* space is actually useable. For raid56, the space info used
|
|
* doesn't include the parity drive, so we don't have to
|
|
* change the math
|
|
*/
|
|
if (profile & (BTRFS_BLOCK_GROUP_DUP |
|
|
BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID10))
|
|
avail >>= 1;
|
|
|
|
/*
|
|
* If we aren't flushing all things, let us overcommit up to
|
|
* 1/2th of the space. If we can flush, don't let us overcommit
|
|
* too much, let it overcommit up to 1/8 of the space.
|
|
*/
|
|
if (flush == BTRFS_RESERVE_FLUSH_ALL)
|
|
avail >>= 3;
|
|
else
|
|
avail >>= 1;
|
|
|
|
if (used + bytes < space_info->total_bytes + avail)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_writeback_inodes_sb_nr(struct btrfs_fs_info *fs_info,
|
|
unsigned long nr_pages, int nr_items)
|
|
{
|
|
struct super_block *sb = fs_info->sb;
|
|
|
|
if (down_read_trylock(&sb->s_umount)) {
|
|
writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE);
|
|
up_read(&sb->s_umount);
|
|
} else {
|
|
/*
|
|
* We needn't worry the filesystem going from r/w to r/o though
|
|
* we don't acquire ->s_umount mutex, because the filesystem
|
|
* should guarantee the delalloc inodes list be empty after
|
|
* the filesystem is readonly(all dirty pages are written to
|
|
* the disk).
|
|
*/
|
|
btrfs_start_delalloc_roots(fs_info, 0, nr_items);
|
|
if (!current->journal_info)
|
|
btrfs_wait_ordered_roots(fs_info, nr_items, 0, (u64)-1);
|
|
}
|
|
}
|
|
|
|
static inline u64 calc_reclaim_items_nr(struct btrfs_fs_info *fs_info,
|
|
u64 to_reclaim)
|
|
{
|
|
u64 bytes;
|
|
u64 nr;
|
|
|
|
bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
nr = div64_u64(to_reclaim, bytes);
|
|
if (!nr)
|
|
nr = 1;
|
|
return nr;
|
|
}
|
|
|
|
#define EXTENT_SIZE_PER_ITEM SZ_256K
|
|
|
|
/*
|
|
* shrink metadata reservation for delalloc
|
|
*/
|
|
static void shrink_delalloc(struct btrfs_fs_info *fs_info, u64 to_reclaim,
|
|
u64 orig, bool wait_ordered)
|
|
{
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 delalloc_bytes;
|
|
u64 max_reclaim;
|
|
u64 items;
|
|
long time_left;
|
|
unsigned long nr_pages;
|
|
int loops;
|
|
enum btrfs_reserve_flush_enum flush;
|
|
|
|
/* Calc the number of the pages we need flush for space reservation */
|
|
items = calc_reclaim_items_nr(fs_info, to_reclaim);
|
|
to_reclaim = items * EXTENT_SIZE_PER_ITEM;
|
|
|
|
trans = (struct btrfs_trans_handle *)current->journal_info;
|
|
space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
|
|
delalloc_bytes = percpu_counter_sum_positive(
|
|
&fs_info->delalloc_bytes);
|
|
if (delalloc_bytes == 0) {
|
|
if (trans)
|
|
return;
|
|
if (wait_ordered)
|
|
btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1);
|
|
return;
|
|
}
|
|
|
|
loops = 0;
|
|
while (delalloc_bytes && loops < 3) {
|
|
max_reclaim = min(delalloc_bytes, to_reclaim);
|
|
nr_pages = max_reclaim >> PAGE_SHIFT;
|
|
btrfs_writeback_inodes_sb_nr(fs_info, nr_pages, items);
|
|
/*
|
|
* We need to wait for the async pages to actually start before
|
|
* we do anything.
|
|
*/
|
|
max_reclaim = atomic_read(&fs_info->async_delalloc_pages);
|
|
if (!max_reclaim)
|
|
goto skip_async;
|
|
|
|
if (max_reclaim <= nr_pages)
|
|
max_reclaim = 0;
|
|
else
|
|
max_reclaim -= nr_pages;
|
|
|
|
wait_event(fs_info->async_submit_wait,
|
|
atomic_read(&fs_info->async_delalloc_pages) <=
|
|
(int)max_reclaim);
|
|
skip_async:
|
|
if (!trans)
|
|
flush = BTRFS_RESERVE_FLUSH_ALL;
|
|
else
|
|
flush = BTRFS_RESERVE_NO_FLUSH;
|
|
spin_lock(&space_info->lock);
|
|
if (list_empty(&space_info->tickets) &&
|
|
list_empty(&space_info->priority_tickets)) {
|
|
spin_unlock(&space_info->lock);
|
|
break;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
loops++;
|
|
if (wait_ordered && !trans) {
|
|
btrfs_wait_ordered_roots(fs_info, items, 0, (u64)-1);
|
|
} else {
|
|
time_left = schedule_timeout_killable(1);
|
|
if (time_left)
|
|
break;
|
|
}
|
|
delalloc_bytes = percpu_counter_sum_positive(
|
|
&fs_info->delalloc_bytes);
|
|
}
|
|
}
|
|
|
|
struct reserve_ticket {
|
|
u64 bytes;
|
|
int error;
|
|
struct list_head list;
|
|
wait_queue_head_t wait;
|
|
};
|
|
|
|
/**
|
|
* maybe_commit_transaction - possibly commit the transaction if its ok to
|
|
* @root - the root we're allocating for
|
|
* @bytes - the number of bytes we want to reserve
|
|
* @force - force the commit
|
|
*
|
|
* This will check to make sure that committing the transaction will actually
|
|
* get us somewhere and then commit the transaction if it does. Otherwise it
|
|
* will return -ENOSPC.
|
|
*/
|
|
static int may_commit_transaction(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info)
|
|
{
|
|
struct reserve_ticket *ticket = NULL;
|
|
struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_block_rsv;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 bytes;
|
|
|
|
trans = (struct btrfs_trans_handle *)current->journal_info;
|
|
if (trans)
|
|
return -EAGAIN;
|
|
|
|
spin_lock(&space_info->lock);
|
|
if (!list_empty(&space_info->priority_tickets))
|
|
ticket = list_first_entry(&space_info->priority_tickets,
|
|
struct reserve_ticket, list);
|
|
else if (!list_empty(&space_info->tickets))
|
|
ticket = list_first_entry(&space_info->tickets,
|
|
struct reserve_ticket, list);
|
|
bytes = (ticket) ? ticket->bytes : 0;
|
|
spin_unlock(&space_info->lock);
|
|
|
|
if (!bytes)
|
|
return 0;
|
|
|
|
/* See if there is enough pinned space to make this reservation */
|
|
if (percpu_counter_compare(&space_info->total_bytes_pinned,
|
|
bytes) >= 0)
|
|
goto commit;
|
|
|
|
/*
|
|
* See if there is some space in the delayed insertion reservation for
|
|
* this reservation.
|
|
*/
|
|
if (space_info != delayed_rsv->space_info)
|
|
return -ENOSPC;
|
|
|
|
spin_lock(&delayed_rsv->lock);
|
|
if (delayed_rsv->size > bytes)
|
|
bytes = 0;
|
|
else
|
|
bytes -= delayed_rsv->size;
|
|
if (percpu_counter_compare(&space_info->total_bytes_pinned,
|
|
bytes) < 0) {
|
|
spin_unlock(&delayed_rsv->lock);
|
|
return -ENOSPC;
|
|
}
|
|
spin_unlock(&delayed_rsv->lock);
|
|
|
|
commit:
|
|
trans = btrfs_join_transaction(fs_info->extent_root);
|
|
if (IS_ERR(trans))
|
|
return -ENOSPC;
|
|
|
|
return btrfs_commit_transaction(trans);
|
|
}
|
|
|
|
/*
|
|
* Try to flush some data based on policy set by @state. This is only advisory
|
|
* and may fail for various reasons. The caller is supposed to examine the
|
|
* state of @space_info to detect the outcome.
|
|
*/
|
|
static void flush_space(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info, u64 num_bytes,
|
|
int state)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_trans_handle *trans;
|
|
int nr;
|
|
int ret = 0;
|
|
|
|
switch (state) {
|
|
case FLUSH_DELAYED_ITEMS_NR:
|
|
case FLUSH_DELAYED_ITEMS:
|
|
if (state == FLUSH_DELAYED_ITEMS_NR)
|
|
nr = calc_reclaim_items_nr(fs_info, num_bytes) * 2;
|
|
else
|
|
nr = -1;
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
ret = btrfs_run_delayed_items_nr(trans, fs_info, nr);
|
|
btrfs_end_transaction(trans);
|
|
break;
|
|
case FLUSH_DELALLOC:
|
|
case FLUSH_DELALLOC_WAIT:
|
|
shrink_delalloc(fs_info, num_bytes * 2, num_bytes,
|
|
state == FLUSH_DELALLOC_WAIT);
|
|
break;
|
|
case ALLOC_CHUNK:
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
ret = do_chunk_alloc(trans, fs_info,
|
|
btrfs_metadata_alloc_profile(fs_info),
|
|
CHUNK_ALLOC_NO_FORCE);
|
|
btrfs_end_transaction(trans);
|
|
if (ret > 0 || ret == -ENOSPC)
|
|
ret = 0;
|
|
break;
|
|
case COMMIT_TRANS:
|
|
ret = may_commit_transaction(fs_info, space_info);
|
|
break;
|
|
default:
|
|
ret = -ENOSPC;
|
|
break;
|
|
}
|
|
|
|
trace_btrfs_flush_space(fs_info, space_info->flags, num_bytes, state,
|
|
ret);
|
|
return;
|
|
}
|
|
|
|
static inline u64
|
|
btrfs_calc_reclaim_metadata_size(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
bool system_chunk)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
u64 used;
|
|
u64 expected;
|
|
u64 to_reclaim = 0;
|
|
|
|
list_for_each_entry(ticket, &space_info->tickets, list)
|
|
to_reclaim += ticket->bytes;
|
|
list_for_each_entry(ticket, &space_info->priority_tickets, list)
|
|
to_reclaim += ticket->bytes;
|
|
if (to_reclaim)
|
|
return to_reclaim;
|
|
|
|
to_reclaim = min_t(u64, num_online_cpus() * SZ_1M, SZ_16M);
|
|
if (can_overcommit(fs_info, space_info, to_reclaim,
|
|
BTRFS_RESERVE_FLUSH_ALL, system_chunk))
|
|
return 0;
|
|
|
|
used = btrfs_space_info_used(space_info, true);
|
|
|
|
if (can_overcommit(fs_info, space_info, SZ_1M,
|
|
BTRFS_RESERVE_FLUSH_ALL, system_chunk))
|
|
expected = div_factor_fine(space_info->total_bytes, 95);
|
|
else
|
|
expected = div_factor_fine(space_info->total_bytes, 90);
|
|
|
|
if (used > expected)
|
|
to_reclaim = used - expected;
|
|
else
|
|
to_reclaim = 0;
|
|
to_reclaim = min(to_reclaim, space_info->bytes_may_use +
|
|
space_info->bytes_reserved);
|
|
return to_reclaim;
|
|
}
|
|
|
|
static inline int need_do_async_reclaim(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 used, bool system_chunk)
|
|
{
|
|
u64 thresh = div_factor_fine(space_info->total_bytes, 98);
|
|
|
|
/* If we're just plain full then async reclaim just slows us down. */
|
|
if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh)
|
|
return 0;
|
|
|
|
if (!btrfs_calc_reclaim_metadata_size(fs_info, space_info,
|
|
system_chunk))
|
|
return 0;
|
|
|
|
return (used >= thresh && !btrfs_fs_closing(fs_info) &&
|
|
!test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));
|
|
}
|
|
|
|
static void wake_all_tickets(struct list_head *head)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
|
|
while (!list_empty(head)) {
|
|
ticket = list_first_entry(head, struct reserve_ticket, list);
|
|
list_del_init(&ticket->list);
|
|
ticket->error = -ENOSPC;
|
|
wake_up(&ticket->wait);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is for normal flushers, we can wait all goddamned day if we want to. We
|
|
* will loop and continuously try to flush as long as we are making progress.
|
|
* We count progress as clearing off tickets each time we have to loop.
|
|
*/
|
|
static void btrfs_async_reclaim_metadata_space(struct work_struct *work)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_space_info *space_info;
|
|
u64 to_reclaim;
|
|
int flush_state;
|
|
int commit_cycles = 0;
|
|
u64 last_tickets_id;
|
|
|
|
fs_info = container_of(work, struct btrfs_fs_info, async_reclaim_work);
|
|
space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
|
|
spin_lock(&space_info->lock);
|
|
to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info,
|
|
false);
|
|
if (!to_reclaim) {
|
|
space_info->flush = 0;
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
last_tickets_id = space_info->tickets_id;
|
|
spin_unlock(&space_info->lock);
|
|
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
do {
|
|
flush_space(fs_info, space_info, to_reclaim, flush_state);
|
|
spin_lock(&space_info->lock);
|
|
if (list_empty(&space_info->tickets)) {
|
|
space_info->flush = 0;
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info,
|
|
space_info,
|
|
false);
|
|
if (last_tickets_id == space_info->tickets_id) {
|
|
flush_state++;
|
|
} else {
|
|
last_tickets_id = space_info->tickets_id;
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
if (commit_cycles)
|
|
commit_cycles--;
|
|
}
|
|
|
|
if (flush_state > COMMIT_TRANS) {
|
|
commit_cycles++;
|
|
if (commit_cycles > 2) {
|
|
wake_all_tickets(&space_info->tickets);
|
|
space_info->flush = 0;
|
|
} else {
|
|
flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
}
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
} while (flush_state <= COMMIT_TRANS);
|
|
}
|
|
|
|
void btrfs_init_async_reclaim_work(struct work_struct *work)
|
|
{
|
|
INIT_WORK(work, btrfs_async_reclaim_metadata_space);
|
|
}
|
|
|
|
static void priority_reclaim_metadata_space(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
struct reserve_ticket *ticket)
|
|
{
|
|
u64 to_reclaim;
|
|
int flush_state = FLUSH_DELAYED_ITEMS_NR;
|
|
|
|
spin_lock(&space_info->lock);
|
|
to_reclaim = btrfs_calc_reclaim_metadata_size(fs_info, space_info,
|
|
false);
|
|
if (!to_reclaim) {
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
do {
|
|
flush_space(fs_info, space_info, to_reclaim, flush_state);
|
|
flush_state++;
|
|
spin_lock(&space_info->lock);
|
|
if (ticket->bytes == 0) {
|
|
spin_unlock(&space_info->lock);
|
|
return;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
/*
|
|
* Priority flushers can't wait on delalloc without
|
|
* deadlocking.
|
|
*/
|
|
if (flush_state == FLUSH_DELALLOC ||
|
|
flush_state == FLUSH_DELALLOC_WAIT)
|
|
flush_state = ALLOC_CHUNK;
|
|
} while (flush_state < COMMIT_TRANS);
|
|
}
|
|
|
|
static int wait_reserve_ticket(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
struct reserve_ticket *ticket, u64 orig_bytes)
|
|
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
int ret = 0;
|
|
|
|
spin_lock(&space_info->lock);
|
|
while (ticket->bytes > 0 && ticket->error == 0) {
|
|
ret = prepare_to_wait_event(&ticket->wait, &wait, TASK_KILLABLE);
|
|
if (ret) {
|
|
ret = -EINTR;
|
|
break;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
schedule();
|
|
|
|
finish_wait(&ticket->wait, &wait);
|
|
spin_lock(&space_info->lock);
|
|
}
|
|
if (!ret)
|
|
ret = ticket->error;
|
|
if (!list_empty(&ticket->list))
|
|
list_del_init(&ticket->list);
|
|
if (ticket->bytes && ticket->bytes < orig_bytes) {
|
|
u64 num_bytes = orig_bytes - ticket->bytes;
|
|
space_info->bytes_may_use -= num_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags, num_bytes, 0);
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
|
|
* @root - the root we're allocating for
|
|
* @space_info - the space info we want to allocate from
|
|
* @orig_bytes - the number of bytes we want
|
|
* @flush - whether or not we can flush to make our reservation
|
|
*
|
|
* This will reserve orig_bytes number of bytes from the space info associated
|
|
* with the block_rsv. If there is not enough space it will make an attempt to
|
|
* flush out space to make room. It will do this by flushing delalloc if
|
|
* possible or committing the transaction. If flush is 0 then no attempts to
|
|
* regain reservations will be made and this will fail if there is not enough
|
|
* space already.
|
|
*/
|
|
static int __reserve_metadata_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 orig_bytes,
|
|
enum btrfs_reserve_flush_enum flush,
|
|
bool system_chunk)
|
|
{
|
|
struct reserve_ticket ticket;
|
|
u64 used;
|
|
int ret = 0;
|
|
|
|
ASSERT(orig_bytes);
|
|
ASSERT(!current->journal_info || flush != BTRFS_RESERVE_FLUSH_ALL);
|
|
|
|
spin_lock(&space_info->lock);
|
|
ret = -ENOSPC;
|
|
used = btrfs_space_info_used(space_info, true);
|
|
|
|
/*
|
|
* If we have enough space then hooray, make our reservation and carry
|
|
* on. If not see if we can overcommit, and if we can, hooray carry on.
|
|
* If not things get more complicated.
|
|
*/
|
|
if (used + orig_bytes <= space_info->total_bytes) {
|
|
space_info->bytes_may_use += orig_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags, orig_bytes, 1);
|
|
ret = 0;
|
|
} else if (can_overcommit(fs_info, space_info, orig_bytes, flush,
|
|
system_chunk)) {
|
|
space_info->bytes_may_use += orig_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags, orig_bytes, 1);
|
|
ret = 0;
|
|
}
|
|
|
|
/*
|
|
* If we couldn't make a reservation then setup our reservation ticket
|
|
* and kick the async worker if it's not already running.
|
|
*
|
|
* If we are a priority flusher then we just need to add our ticket to
|
|
* the list and we will do our own flushing further down.
|
|
*/
|
|
if (ret && flush != BTRFS_RESERVE_NO_FLUSH) {
|
|
ticket.bytes = orig_bytes;
|
|
ticket.error = 0;
|
|
init_waitqueue_head(&ticket.wait);
|
|
if (flush == BTRFS_RESERVE_FLUSH_ALL) {
|
|
list_add_tail(&ticket.list, &space_info->tickets);
|
|
if (!space_info->flush) {
|
|
space_info->flush = 1;
|
|
trace_btrfs_trigger_flush(fs_info,
|
|
space_info->flags,
|
|
orig_bytes, flush,
|
|
"enospc");
|
|
queue_work(system_unbound_wq,
|
|
&fs_info->async_reclaim_work);
|
|
}
|
|
} else {
|
|
list_add_tail(&ticket.list,
|
|
&space_info->priority_tickets);
|
|
}
|
|
} else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
|
|
used += orig_bytes;
|
|
/*
|
|
* We will do the space reservation dance during log replay,
|
|
* which means we won't have fs_info->fs_root set, so don't do
|
|
* the async reclaim as we will panic.
|
|
*/
|
|
if (!test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags) &&
|
|
need_do_async_reclaim(fs_info, space_info,
|
|
used, system_chunk) &&
|
|
!work_busy(&fs_info->async_reclaim_work)) {
|
|
trace_btrfs_trigger_flush(fs_info, space_info->flags,
|
|
orig_bytes, flush, "preempt");
|
|
queue_work(system_unbound_wq,
|
|
&fs_info->async_reclaim_work);
|
|
}
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
if (!ret || flush == BTRFS_RESERVE_NO_FLUSH)
|
|
return ret;
|
|
|
|
if (flush == BTRFS_RESERVE_FLUSH_ALL)
|
|
return wait_reserve_ticket(fs_info, space_info, &ticket,
|
|
orig_bytes);
|
|
|
|
ret = 0;
|
|
priority_reclaim_metadata_space(fs_info, space_info, &ticket);
|
|
spin_lock(&space_info->lock);
|
|
if (ticket.bytes) {
|
|
if (ticket.bytes < orig_bytes) {
|
|
u64 num_bytes = orig_bytes - ticket.bytes;
|
|
space_info->bytes_may_use -= num_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags,
|
|
num_bytes, 0);
|
|
|
|
}
|
|
list_del_init(&ticket.list);
|
|
ret = -ENOSPC;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
ASSERT(list_empty(&ticket.list));
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* reserve_metadata_bytes - try to reserve bytes from the block_rsv's space
|
|
* @root - the root we're allocating for
|
|
* @block_rsv - the block_rsv we're allocating for
|
|
* @orig_bytes - the number of bytes we want
|
|
* @flush - whether or not we can flush to make our reservation
|
|
*
|
|
* This will reserve orgi_bytes number of bytes from the space info associated
|
|
* with the block_rsv. If there is not enough space it will make an attempt to
|
|
* flush out space to make room. It will do this by flushing delalloc if
|
|
* possible or committing the transaction. If flush is 0 then no attempts to
|
|
* regain reservations will be made and this will fail if there is not enough
|
|
* space already.
|
|
*/
|
|
static int reserve_metadata_bytes(struct btrfs_root *root,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
u64 orig_bytes,
|
|
enum btrfs_reserve_flush_enum flush)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
int ret;
|
|
bool system_chunk = (root == fs_info->chunk_root);
|
|
|
|
ret = __reserve_metadata_bytes(fs_info, block_rsv->space_info,
|
|
orig_bytes, flush, system_chunk);
|
|
if (ret == -ENOSPC &&
|
|
unlikely(root->orphan_cleanup_state == ORPHAN_CLEANUP_STARTED)) {
|
|
if (block_rsv != global_rsv &&
|
|
!block_rsv_use_bytes(global_rsv, orig_bytes))
|
|
ret = 0;
|
|
}
|
|
if (ret == -ENOSPC)
|
|
trace_btrfs_space_reservation(fs_info, "space_info:enospc",
|
|
block_rsv->space_info->flags,
|
|
orig_bytes, 1);
|
|
return ret;
|
|
}
|
|
|
|
static struct btrfs_block_rsv *get_block_rsv(
|
|
const struct btrfs_trans_handle *trans,
|
|
const struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *block_rsv = NULL;
|
|
|
|
if (test_bit(BTRFS_ROOT_REF_COWS, &root->state) ||
|
|
(root == fs_info->csum_root && trans->adding_csums) ||
|
|
(root == fs_info->uuid_root))
|
|
block_rsv = trans->block_rsv;
|
|
|
|
if (!block_rsv)
|
|
block_rsv = root->block_rsv;
|
|
|
|
if (!block_rsv)
|
|
block_rsv = &fs_info->empty_block_rsv;
|
|
|
|
return block_rsv;
|
|
}
|
|
|
|
static int block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv,
|
|
u64 num_bytes)
|
|
{
|
|
int ret = -ENOSPC;
|
|
spin_lock(&block_rsv->lock);
|
|
if (block_rsv->reserved >= num_bytes) {
|
|
block_rsv->reserved -= num_bytes;
|
|
if (block_rsv->reserved < block_rsv->size)
|
|
block_rsv->full = 0;
|
|
ret = 0;
|
|
}
|
|
spin_unlock(&block_rsv->lock);
|
|
return ret;
|
|
}
|
|
|
|
static void block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
|
|
u64 num_bytes, int update_size)
|
|
{
|
|
spin_lock(&block_rsv->lock);
|
|
block_rsv->reserved += num_bytes;
|
|
if (update_size)
|
|
block_rsv->size += num_bytes;
|
|
else if (block_rsv->reserved >= block_rsv->size)
|
|
block_rsv->full = 1;
|
|
spin_unlock(&block_rsv->lock);
|
|
}
|
|
|
|
int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *dest, u64 num_bytes,
|
|
int min_factor)
|
|
{
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
u64 min_bytes;
|
|
|
|
if (global_rsv->space_info != dest->space_info)
|
|
return -ENOSPC;
|
|
|
|
spin_lock(&global_rsv->lock);
|
|
min_bytes = div_factor(global_rsv->size, min_factor);
|
|
if (global_rsv->reserved < min_bytes + num_bytes) {
|
|
spin_unlock(&global_rsv->lock);
|
|
return -ENOSPC;
|
|
}
|
|
global_rsv->reserved -= num_bytes;
|
|
if (global_rsv->reserved < global_rsv->size)
|
|
global_rsv->full = 0;
|
|
spin_unlock(&global_rsv->lock);
|
|
|
|
block_rsv_add_bytes(dest, num_bytes, 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is for space we already have accounted in space_info->bytes_may_use, so
|
|
* basically when we're returning space from block_rsv's.
|
|
*/
|
|
static void space_info_add_old_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 num_bytes)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
struct list_head *head;
|
|
u64 used;
|
|
enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_NO_FLUSH;
|
|
bool check_overcommit = false;
|
|
|
|
spin_lock(&space_info->lock);
|
|
head = &space_info->priority_tickets;
|
|
|
|
/*
|
|
* If we are over our limit then we need to check and see if we can
|
|
* overcommit, and if we can't then we just need to free up our space
|
|
* and not satisfy any requests.
|
|
*/
|
|
used = btrfs_space_info_used(space_info, true);
|
|
if (used - num_bytes >= space_info->total_bytes)
|
|
check_overcommit = true;
|
|
again:
|
|
while (!list_empty(head) && num_bytes) {
|
|
ticket = list_first_entry(head, struct reserve_ticket,
|
|
list);
|
|
/*
|
|
* We use 0 bytes because this space is already reserved, so
|
|
* adding the ticket space would be a double count.
|
|
*/
|
|
if (check_overcommit &&
|
|
!can_overcommit(fs_info, space_info, 0, flush, false))
|
|
break;
|
|
if (num_bytes >= ticket->bytes) {
|
|
list_del_init(&ticket->list);
|
|
num_bytes -= ticket->bytes;
|
|
ticket->bytes = 0;
|
|
space_info->tickets_id++;
|
|
wake_up(&ticket->wait);
|
|
} else {
|
|
ticket->bytes -= num_bytes;
|
|
num_bytes = 0;
|
|
}
|
|
}
|
|
|
|
if (num_bytes && head == &space_info->priority_tickets) {
|
|
head = &space_info->tickets;
|
|
flush = BTRFS_RESERVE_FLUSH_ALL;
|
|
goto again;
|
|
}
|
|
space_info->bytes_may_use -= num_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags, num_bytes, 0);
|
|
spin_unlock(&space_info->lock);
|
|
}
|
|
|
|
/*
|
|
* This is for newly allocated space that isn't accounted in
|
|
* space_info->bytes_may_use yet. So if we allocate a chunk or unpin an extent
|
|
* we use this helper.
|
|
*/
|
|
static void space_info_add_new_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info,
|
|
u64 num_bytes)
|
|
{
|
|
struct reserve_ticket *ticket;
|
|
struct list_head *head = &space_info->priority_tickets;
|
|
|
|
again:
|
|
while (!list_empty(head) && num_bytes) {
|
|
ticket = list_first_entry(head, struct reserve_ticket,
|
|
list);
|
|
if (num_bytes >= ticket->bytes) {
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags,
|
|
ticket->bytes, 1);
|
|
list_del_init(&ticket->list);
|
|
num_bytes -= ticket->bytes;
|
|
space_info->bytes_may_use += ticket->bytes;
|
|
ticket->bytes = 0;
|
|
space_info->tickets_id++;
|
|
wake_up(&ticket->wait);
|
|
} else {
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
space_info->flags,
|
|
num_bytes, 1);
|
|
space_info->bytes_may_use += num_bytes;
|
|
ticket->bytes -= num_bytes;
|
|
num_bytes = 0;
|
|
}
|
|
}
|
|
|
|
if (num_bytes && head == &space_info->priority_tickets) {
|
|
head = &space_info->tickets;
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
static u64 block_rsv_release_bytes(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
struct btrfs_block_rsv *dest, u64 num_bytes)
|
|
{
|
|
struct btrfs_space_info *space_info = block_rsv->space_info;
|
|
u64 ret;
|
|
|
|
spin_lock(&block_rsv->lock);
|
|
if (num_bytes == (u64)-1)
|
|
num_bytes = block_rsv->size;
|
|
block_rsv->size -= num_bytes;
|
|
if (block_rsv->reserved >= block_rsv->size) {
|
|
num_bytes = block_rsv->reserved - block_rsv->size;
|
|
block_rsv->reserved = block_rsv->size;
|
|
block_rsv->full = 1;
|
|
} else {
|
|
num_bytes = 0;
|
|
}
|
|
spin_unlock(&block_rsv->lock);
|
|
|
|
ret = num_bytes;
|
|
if (num_bytes > 0) {
|
|
if (dest) {
|
|
spin_lock(&dest->lock);
|
|
if (!dest->full) {
|
|
u64 bytes_to_add;
|
|
|
|
bytes_to_add = dest->size - dest->reserved;
|
|
bytes_to_add = min(num_bytes, bytes_to_add);
|
|
dest->reserved += bytes_to_add;
|
|
if (dest->reserved >= dest->size)
|
|
dest->full = 1;
|
|
num_bytes -= bytes_to_add;
|
|
}
|
|
spin_unlock(&dest->lock);
|
|
}
|
|
if (num_bytes)
|
|
space_info_add_old_bytes(fs_info, space_info,
|
|
num_bytes);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src,
|
|
struct btrfs_block_rsv *dst, u64 num_bytes,
|
|
int update_size)
|
|
{
|
|
int ret;
|
|
|
|
ret = block_rsv_use_bytes(src, num_bytes);
|
|
if (ret)
|
|
return ret;
|
|
|
|
block_rsv_add_bytes(dst, num_bytes, update_size);
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type)
|
|
{
|
|
memset(rsv, 0, sizeof(*rsv));
|
|
spin_lock_init(&rsv->lock);
|
|
rsv->type = type;
|
|
}
|
|
|
|
void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *rsv,
|
|
unsigned short type)
|
|
{
|
|
btrfs_init_block_rsv(rsv, type);
|
|
rsv->space_info = __find_space_info(fs_info,
|
|
BTRFS_BLOCK_GROUP_METADATA);
|
|
}
|
|
|
|
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
|
|
unsigned short type)
|
|
{
|
|
struct btrfs_block_rsv *block_rsv;
|
|
|
|
block_rsv = kmalloc(sizeof(*block_rsv), GFP_NOFS);
|
|
if (!block_rsv)
|
|
return NULL;
|
|
|
|
btrfs_init_metadata_block_rsv(fs_info, block_rsv, type);
|
|
return block_rsv;
|
|
}
|
|
|
|
void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *rsv)
|
|
{
|
|
if (!rsv)
|
|
return;
|
|
btrfs_block_rsv_release(fs_info, rsv, (u64)-1);
|
|
kfree(rsv);
|
|
}
|
|
|
|
void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv)
|
|
{
|
|
kfree(rsv);
|
|
}
|
|
|
|
int btrfs_block_rsv_add(struct btrfs_root *root,
|
|
struct btrfs_block_rsv *block_rsv, u64 num_bytes,
|
|
enum btrfs_reserve_flush_enum flush)
|
|
{
|
|
int ret;
|
|
|
|
if (num_bytes == 0)
|
|
return 0;
|
|
|
|
ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
|
|
if (!ret) {
|
|
block_rsv_add_bytes(block_rsv, num_bytes, 1);
|
|
return 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor)
|
|
{
|
|
u64 num_bytes = 0;
|
|
int ret = -ENOSPC;
|
|
|
|
if (!block_rsv)
|
|
return 0;
|
|
|
|
spin_lock(&block_rsv->lock);
|
|
num_bytes = div_factor(block_rsv->size, min_factor);
|
|
if (block_rsv->reserved >= num_bytes)
|
|
ret = 0;
|
|
spin_unlock(&block_rsv->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_block_rsv_refill(struct btrfs_root *root,
|
|
struct btrfs_block_rsv *block_rsv, u64 min_reserved,
|
|
enum btrfs_reserve_flush_enum flush)
|
|
{
|
|
u64 num_bytes = 0;
|
|
int ret = -ENOSPC;
|
|
|
|
if (!block_rsv)
|
|
return 0;
|
|
|
|
spin_lock(&block_rsv->lock);
|
|
num_bytes = min_reserved;
|
|
if (block_rsv->reserved >= num_bytes)
|
|
ret = 0;
|
|
else
|
|
num_bytes -= block_rsv->reserved;
|
|
spin_unlock(&block_rsv->lock);
|
|
|
|
if (!ret)
|
|
return 0;
|
|
|
|
ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
|
|
if (!ret) {
|
|
block_rsv_add_bytes(block_rsv, num_bytes, 0);
|
|
return 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* btrfs_inode_rsv_refill - refill the inode block rsv.
|
|
* @inode - the inode we are refilling.
|
|
* @flush - the flusing restriction.
|
|
*
|
|
* Essentially the same as btrfs_block_rsv_refill, except it uses the
|
|
* block_rsv->size as the minimum size. We'll either refill the missing amount
|
|
* or return if we already have enough space. This will also handle the resreve
|
|
* tracepoint for the reserved amount.
|
|
*/
|
|
int btrfs_inode_rsv_refill(struct btrfs_inode *inode,
|
|
enum btrfs_reserve_flush_enum flush)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct btrfs_block_rsv *block_rsv = &inode->block_rsv;
|
|
u64 num_bytes = 0;
|
|
int ret = -ENOSPC;
|
|
|
|
spin_lock(&block_rsv->lock);
|
|
if (block_rsv->reserved < block_rsv->size)
|
|
num_bytes = block_rsv->size - block_rsv->reserved;
|
|
spin_unlock(&block_rsv->lock);
|
|
|
|
if (num_bytes == 0)
|
|
return 0;
|
|
|
|
ret = reserve_metadata_bytes(root, block_rsv, num_bytes, flush);
|
|
if (!ret) {
|
|
block_rsv_add_bytes(block_rsv, num_bytes, 0);
|
|
trace_btrfs_space_reservation(root->fs_info, "delalloc",
|
|
btrfs_ino(inode), num_bytes, 1);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* btrfs_inode_rsv_release - release any excessive reservation.
|
|
* @inode - the inode we need to release from.
|
|
*
|
|
* This is the same as btrfs_block_rsv_release, except that it handles the
|
|
* tracepoint for the reservation.
|
|
*/
|
|
void btrfs_inode_rsv_release(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = inode->root->fs_info;
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
struct btrfs_block_rsv *block_rsv = &inode->block_rsv;
|
|
u64 released = 0;
|
|
|
|
/*
|
|
* Since we statically set the block_rsv->size we just want to say we
|
|
* are releasing 0 bytes, and then we'll just get the reservation over
|
|
* the size free'd.
|
|
*/
|
|
released = block_rsv_release_bytes(fs_info, block_rsv, global_rsv, 0);
|
|
if (released > 0)
|
|
trace_btrfs_space_reservation(fs_info, "delalloc",
|
|
btrfs_ino(inode), released, 0);
|
|
}
|
|
|
|
void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
u64 num_bytes)
|
|
{
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
|
|
if (global_rsv == block_rsv ||
|
|
block_rsv->space_info != global_rsv->space_info)
|
|
global_rsv = NULL;
|
|
block_rsv_release_bytes(fs_info, block_rsv, global_rsv, num_bytes);
|
|
}
|
|
|
|
static void update_global_block_rsv(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
|
|
struct btrfs_space_info *sinfo = block_rsv->space_info;
|
|
u64 num_bytes;
|
|
|
|
/*
|
|
* The global block rsv is based on the size of the extent tree, the
|
|
* checksum tree and the root tree. If the fs is empty we want to set
|
|
* it to a minimal amount for safety.
|
|
*/
|
|
num_bytes = btrfs_root_used(&fs_info->extent_root->root_item) +
|
|
btrfs_root_used(&fs_info->csum_root->root_item) +
|
|
btrfs_root_used(&fs_info->tree_root->root_item);
|
|
num_bytes = max_t(u64, num_bytes, SZ_16M);
|
|
|
|
spin_lock(&sinfo->lock);
|
|
spin_lock(&block_rsv->lock);
|
|
|
|
block_rsv->size = min_t(u64, num_bytes, SZ_512M);
|
|
|
|
if (block_rsv->reserved < block_rsv->size) {
|
|
num_bytes = btrfs_space_info_used(sinfo, true);
|
|
if (sinfo->total_bytes > num_bytes) {
|
|
num_bytes = sinfo->total_bytes - num_bytes;
|
|
num_bytes = min(num_bytes,
|
|
block_rsv->size - block_rsv->reserved);
|
|
block_rsv->reserved += num_bytes;
|
|
sinfo->bytes_may_use += num_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
sinfo->flags, num_bytes,
|
|
1);
|
|
}
|
|
} else if (block_rsv->reserved > block_rsv->size) {
|
|
num_bytes = block_rsv->reserved - block_rsv->size;
|
|
sinfo->bytes_may_use -= num_bytes;
|
|
trace_btrfs_space_reservation(fs_info, "space_info",
|
|
sinfo->flags, num_bytes, 0);
|
|
block_rsv->reserved = block_rsv->size;
|
|
}
|
|
|
|
if (block_rsv->reserved == block_rsv->size)
|
|
block_rsv->full = 1;
|
|
else
|
|
block_rsv->full = 0;
|
|
|
|
spin_unlock(&block_rsv->lock);
|
|
spin_unlock(&sinfo->lock);
|
|
}
|
|
|
|
static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_space_info *space_info;
|
|
|
|
space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_SYSTEM);
|
|
fs_info->chunk_block_rsv.space_info = space_info;
|
|
|
|
space_info = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
|
|
fs_info->global_block_rsv.space_info = space_info;
|
|
fs_info->trans_block_rsv.space_info = space_info;
|
|
fs_info->empty_block_rsv.space_info = space_info;
|
|
fs_info->delayed_block_rsv.space_info = space_info;
|
|
|
|
fs_info->extent_root->block_rsv = &fs_info->global_block_rsv;
|
|
fs_info->csum_root->block_rsv = &fs_info->global_block_rsv;
|
|
fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;
|
|
fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
|
|
if (fs_info->quota_root)
|
|
fs_info->quota_root->block_rsv = &fs_info->global_block_rsv;
|
|
fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
|
|
|
|
update_global_block_rsv(fs_info);
|
|
}
|
|
|
|
static void release_global_block_rsv(struct btrfs_fs_info *fs_info)
|
|
{
|
|
block_rsv_release_bytes(fs_info, &fs_info->global_block_rsv, NULL,
|
|
(u64)-1);
|
|
WARN_ON(fs_info->trans_block_rsv.size > 0);
|
|
WARN_ON(fs_info->trans_block_rsv.reserved > 0);
|
|
WARN_ON(fs_info->chunk_block_rsv.size > 0);
|
|
WARN_ON(fs_info->chunk_block_rsv.reserved > 0);
|
|
WARN_ON(fs_info->delayed_block_rsv.size > 0);
|
|
WARN_ON(fs_info->delayed_block_rsv.reserved > 0);
|
|
}
|
|
|
|
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (!trans->block_rsv) {
|
|
ASSERT(!trans->bytes_reserved);
|
|
return;
|
|
}
|
|
|
|
if (!trans->bytes_reserved)
|
|
return;
|
|
|
|
ASSERT(trans->block_rsv == &fs_info->trans_block_rsv);
|
|
trace_btrfs_space_reservation(fs_info, "transaction",
|
|
trans->transid, trans->bytes_reserved, 0);
|
|
btrfs_block_rsv_release(fs_info, trans->block_rsv,
|
|
trans->bytes_reserved);
|
|
trans->bytes_reserved = 0;
|
|
}
|
|
|
|
/*
|
|
* To be called after all the new block groups attached to the transaction
|
|
* handle have been created (btrfs_create_pending_block_groups()).
|
|
*/
|
|
void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
|
|
if (!trans->chunk_bytes_reserved)
|
|
return;
|
|
|
|
WARN_ON_ONCE(!list_empty(&trans->new_bgs));
|
|
|
|
block_rsv_release_bytes(fs_info, &fs_info->chunk_block_rsv, NULL,
|
|
trans->chunk_bytes_reserved);
|
|
trans->chunk_bytes_reserved = 0;
|
|
}
|
|
|
|
/* Can only return 0 or -ENOSPC */
|
|
int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
struct btrfs_root *root = inode->root;
|
|
/*
|
|
* We always use trans->block_rsv here as we will have reserved space
|
|
* for our orphan when starting the transaction, using get_block_rsv()
|
|
* here will sometimes make us choose the wrong block rsv as we could be
|
|
* doing a reloc inode for a non refcounted root.
|
|
*/
|
|
struct btrfs_block_rsv *src_rsv = trans->block_rsv;
|
|
struct btrfs_block_rsv *dst_rsv = root->orphan_block_rsv;
|
|
|
|
/*
|
|
* We need to hold space in order to delete our orphan item once we've
|
|
* added it, so this takes the reservation so we can release it later
|
|
* when we are truly done with the orphan item.
|
|
*/
|
|
u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
|
|
trace_btrfs_space_reservation(fs_info, "orphan", btrfs_ino(inode),
|
|
num_bytes, 1);
|
|
return btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes, 1);
|
|
}
|
|
|
|
void btrfs_orphan_release_metadata(struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
struct btrfs_root *root = inode->root;
|
|
u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, 1);
|
|
|
|
trace_btrfs_space_reservation(fs_info, "orphan", btrfs_ino(inode),
|
|
num_bytes, 0);
|
|
btrfs_block_rsv_release(fs_info, root->orphan_block_rsv, num_bytes);
|
|
}
|
|
|
|
/*
|
|
* btrfs_subvolume_reserve_metadata() - reserve space for subvolume operation
|
|
* root: the root of the parent directory
|
|
* rsv: block reservation
|
|
* items: the number of items that we need do reservation
|
|
* qgroup_reserved: used to return the reserved size in qgroup
|
|
*
|
|
* This function is used to reserve the space for snapshot/subvolume
|
|
* creation and deletion. Those operations are different with the
|
|
* common file/directory operations, they change two fs/file trees
|
|
* and root tree, the number of items that the qgroup reserves is
|
|
* different with the free space reservation. So we can not use
|
|
* the space reservation mechanism in start_transaction().
|
|
*/
|
|
int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
|
|
struct btrfs_block_rsv *rsv,
|
|
int items,
|
|
u64 *qgroup_reserved,
|
|
bool use_global_rsv)
|
|
{
|
|
u64 num_bytes;
|
|
int ret;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
|
|
if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
|
|
/* One for parent inode, two for dir entries */
|
|
num_bytes = 3 * fs_info->nodesize;
|
|
ret = btrfs_qgroup_reserve_meta(root, num_bytes, true);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
num_bytes = 0;
|
|
}
|
|
|
|
*qgroup_reserved = num_bytes;
|
|
|
|
num_bytes = btrfs_calc_trans_metadata_size(fs_info, items);
|
|
rsv->space_info = __find_space_info(fs_info,
|
|
BTRFS_BLOCK_GROUP_METADATA);
|
|
ret = btrfs_block_rsv_add(root, rsv, num_bytes,
|
|
BTRFS_RESERVE_FLUSH_ALL);
|
|
|
|
if (ret == -ENOSPC && use_global_rsv)
|
|
ret = btrfs_block_rsv_migrate(global_rsv, rsv, num_bytes, 1);
|
|
|
|
if (ret && *qgroup_reserved)
|
|
btrfs_qgroup_free_meta(root, *qgroup_reserved);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *rsv)
|
|
{
|
|
btrfs_block_rsv_release(fs_info, rsv, (u64)-1);
|
|
}
|
|
|
|
static void btrfs_calculate_inode_block_rsv_size(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_inode *inode)
|
|
{
|
|
struct btrfs_block_rsv *block_rsv = &inode->block_rsv;
|
|
u64 reserve_size = 0;
|
|
u64 csum_leaves;
|
|
unsigned outstanding_extents;
|
|
|
|
lockdep_assert_held(&inode->lock);
|
|
outstanding_extents = inode->outstanding_extents;
|
|
if (outstanding_extents)
|
|
reserve_size = btrfs_calc_trans_metadata_size(fs_info,
|
|
outstanding_extents + 1);
|
|
csum_leaves = btrfs_csum_bytes_to_leaves(fs_info,
|
|
inode->csum_bytes);
|
|
reserve_size += btrfs_calc_trans_metadata_size(fs_info,
|
|
csum_leaves);
|
|
|
|
spin_lock(&block_rsv->lock);
|
|
block_rsv->size = reserve_size;
|
|
spin_unlock(&block_rsv->lock);
|
|
}
|
|
|
|
int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
struct btrfs_root *root = inode->root;
|
|
unsigned nr_extents;
|
|
enum btrfs_reserve_flush_enum flush = BTRFS_RESERVE_FLUSH_ALL;
|
|
int ret = 0;
|
|
bool delalloc_lock = true;
|
|
|
|
/* If we are a free space inode we need to not flush since we will be in
|
|
* the middle of a transaction commit. We also don't need the delalloc
|
|
* mutex since we won't race with anybody. We need this mostly to make
|
|
* lockdep shut its filthy mouth.
|
|
*
|
|
* If we have a transaction open (can happen if we call truncate_block
|
|
* from truncate), then we need FLUSH_LIMIT so we don't deadlock.
|
|
*/
|
|
if (btrfs_is_free_space_inode(inode)) {
|
|
flush = BTRFS_RESERVE_NO_FLUSH;
|
|
delalloc_lock = false;
|
|
} else if (current->journal_info) {
|
|
flush = BTRFS_RESERVE_FLUSH_LIMIT;
|
|
}
|
|
|
|
if (flush != BTRFS_RESERVE_NO_FLUSH &&
|
|
btrfs_transaction_in_commit(fs_info))
|
|
schedule_timeout(1);
|
|
|
|
if (delalloc_lock)
|
|
mutex_lock(&inode->delalloc_mutex);
|
|
|
|
num_bytes = ALIGN(num_bytes, fs_info->sectorsize);
|
|
|
|
/* Add our new extents and calculate the new rsv size. */
|
|
spin_lock(&inode->lock);
|
|
nr_extents = count_max_extents(num_bytes);
|
|
btrfs_mod_outstanding_extents(inode, nr_extents);
|
|
inode->csum_bytes += num_bytes;
|
|
btrfs_calculate_inode_block_rsv_size(fs_info, inode);
|
|
spin_unlock(&inode->lock);
|
|
|
|
if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
|
|
ret = btrfs_qgroup_reserve_meta(root,
|
|
nr_extents * fs_info->nodesize, true);
|
|
if (ret)
|
|
goto out_fail;
|
|
}
|
|
|
|
ret = btrfs_inode_rsv_refill(inode, flush);
|
|
if (unlikely(ret)) {
|
|
btrfs_qgroup_free_meta(root,
|
|
nr_extents * fs_info->nodesize);
|
|
goto out_fail;
|
|
}
|
|
|
|
if (delalloc_lock)
|
|
mutex_unlock(&inode->delalloc_mutex);
|
|
return 0;
|
|
|
|
out_fail:
|
|
spin_lock(&inode->lock);
|
|
nr_extents = count_max_extents(num_bytes);
|
|
btrfs_mod_outstanding_extents(inode, -nr_extents);
|
|
inode->csum_bytes -= num_bytes;
|
|
btrfs_calculate_inode_block_rsv_size(fs_info, inode);
|
|
spin_unlock(&inode->lock);
|
|
|
|
btrfs_inode_rsv_release(inode);
|
|
if (delalloc_lock)
|
|
mutex_unlock(&inode->delalloc_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* btrfs_delalloc_release_metadata - release a metadata reservation for an inode
|
|
* @inode: the inode to release the reservation for.
|
|
* @num_bytes: the number of bytes we are releasing.
|
|
*
|
|
* This will release the metadata reservation for an inode. This can be called
|
|
* once we complete IO for a given set of bytes to release their metadata
|
|
* reservations, or on error for the same reason.
|
|
*/
|
|
void btrfs_delalloc_release_metadata(struct btrfs_inode *inode, u64 num_bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
|
|
num_bytes = ALIGN(num_bytes, fs_info->sectorsize);
|
|
spin_lock(&inode->lock);
|
|
inode->csum_bytes -= num_bytes;
|
|
btrfs_calculate_inode_block_rsv_size(fs_info, inode);
|
|
spin_unlock(&inode->lock);
|
|
|
|
if (btrfs_is_testing(fs_info))
|
|
return;
|
|
|
|
btrfs_inode_rsv_release(inode);
|
|
}
|
|
|
|
/**
|
|
* btrfs_delalloc_release_extents - release our outstanding_extents
|
|
* @inode: the inode to balance the reservation for.
|
|
* @num_bytes: the number of bytes we originally reserved with
|
|
*
|
|
* When we reserve space we increase outstanding_extents for the extents we may
|
|
* add. Once we've set the range as delalloc or created our ordered extents we
|
|
* have outstanding_extents to track the real usage, so we use this to free our
|
|
* temporarily tracked outstanding_extents. This _must_ be used in conjunction
|
|
* with btrfs_delalloc_reserve_metadata.
|
|
*/
|
|
void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
|
|
unsigned num_extents;
|
|
|
|
spin_lock(&inode->lock);
|
|
num_extents = count_max_extents(num_bytes);
|
|
btrfs_mod_outstanding_extents(inode, -num_extents);
|
|
btrfs_calculate_inode_block_rsv_size(fs_info, inode);
|
|
spin_unlock(&inode->lock);
|
|
|
|
if (btrfs_is_testing(fs_info))
|
|
return;
|
|
|
|
btrfs_inode_rsv_release(inode);
|
|
}
|
|
|
|
/**
|
|
* btrfs_delalloc_reserve_space - reserve data and metadata space for
|
|
* delalloc
|
|
* @inode: inode we're writing to
|
|
* @start: start range we are writing to
|
|
* @len: how long the range we are writing to
|
|
* @reserved: mandatory parameter, record actually reserved qgroup ranges of
|
|
* current reservation.
|
|
*
|
|
* This will do the following things
|
|
*
|
|
* o reserve space in data space info for num bytes
|
|
* and reserve precious corresponding qgroup space
|
|
* (Done in check_data_free_space)
|
|
*
|
|
* o reserve space for metadata space, based on the number of outstanding
|
|
* extents and how much csums will be needed
|
|
* also reserve metadata space in a per root over-reserve method.
|
|
* o add to the inodes->delalloc_bytes
|
|
* o add it to the fs_info's delalloc inodes list.
|
|
* (Above 3 all done in delalloc_reserve_metadata)
|
|
*
|
|
* Return 0 for success
|
|
* Return <0 for error(-ENOSPC or -EQUOT)
|
|
*/
|
|
int btrfs_delalloc_reserve_space(struct inode *inode,
|
|
struct extent_changeset **reserved, u64 start, u64 len)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_check_data_free_space(inode, reserved, start, len);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = btrfs_delalloc_reserve_metadata(BTRFS_I(inode), len);
|
|
if (ret < 0)
|
|
btrfs_free_reserved_data_space(inode, *reserved, start, len);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* btrfs_delalloc_release_space - release data and metadata space for delalloc
|
|
* @inode: inode we're releasing space for
|
|
* @start: start position of the space already reserved
|
|
* @len: the len of the space already reserved
|
|
* @release_bytes: the len of the space we consumed or didn't use
|
|
*
|
|
* This function will release the metadata space that was not used and will
|
|
* decrement ->delalloc_bytes and remove it from the fs_info delalloc_inodes
|
|
* list if there are no delalloc bytes left.
|
|
* Also it will handle the qgroup reserved space.
|
|
*/
|
|
void btrfs_delalloc_release_space(struct inode *inode,
|
|
struct extent_changeset *reserved,
|
|
u64 start, u64 len)
|
|
{
|
|
btrfs_delalloc_release_metadata(BTRFS_I(inode), len);
|
|
btrfs_free_reserved_data_space(inode, reserved, start, len);
|
|
}
|
|
|
|
static int update_block_group(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *info, u64 bytenr,
|
|
u64 num_bytes, int alloc)
|
|
{
|
|
struct btrfs_block_group_cache *cache = NULL;
|
|
u64 total = num_bytes;
|
|
u64 old_val;
|
|
u64 byte_in_group;
|
|
int factor;
|
|
|
|
/* block accounting for super block */
|
|
spin_lock(&info->delalloc_root_lock);
|
|
old_val = btrfs_super_bytes_used(info->super_copy);
|
|
if (alloc)
|
|
old_val += num_bytes;
|
|
else
|
|
old_val -= num_bytes;
|
|
btrfs_set_super_bytes_used(info->super_copy, old_val);
|
|
spin_unlock(&info->delalloc_root_lock);
|
|
|
|
while (total) {
|
|
cache = btrfs_lookup_block_group(info, bytenr);
|
|
if (!cache)
|
|
return -ENOENT;
|
|
if (cache->flags & (BTRFS_BLOCK_GROUP_DUP |
|
|
BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID10))
|
|
factor = 2;
|
|
else
|
|
factor = 1;
|
|
/*
|
|
* If this block group has free space cache written out, we
|
|
* need to make sure to load it if we are removing space. This
|
|
* is because we need the unpinning stage to actually add the
|
|
* space back to the block group, otherwise we will leak space.
|
|
*/
|
|
if (!alloc && cache->cached == BTRFS_CACHE_NO)
|
|
cache_block_group(cache, 1);
|
|
|
|
byte_in_group = bytenr - cache->key.objectid;
|
|
WARN_ON(byte_in_group > cache->key.offset);
|
|
|
|
spin_lock(&cache->space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
|
|
if (btrfs_test_opt(info, SPACE_CACHE) &&
|
|
cache->disk_cache_state < BTRFS_DC_CLEAR)
|
|
cache->disk_cache_state = BTRFS_DC_CLEAR;
|
|
|
|
old_val = btrfs_block_group_used(&cache->item);
|
|
num_bytes = min(total, cache->key.offset - byte_in_group);
|
|
if (alloc) {
|
|
old_val += num_bytes;
|
|
btrfs_set_block_group_used(&cache->item, old_val);
|
|
cache->reserved -= num_bytes;
|
|
cache->space_info->bytes_reserved -= num_bytes;
|
|
cache->space_info->bytes_used += num_bytes;
|
|
cache->space_info->disk_used += num_bytes * factor;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
} else {
|
|
old_val -= num_bytes;
|
|
btrfs_set_block_group_used(&cache->item, old_val);
|
|
cache->pinned += num_bytes;
|
|
cache->space_info->bytes_pinned += num_bytes;
|
|
cache->space_info->bytes_used -= num_bytes;
|
|
cache->space_info->disk_used -= num_bytes * factor;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
|
|
trace_btrfs_space_reservation(info, "pinned",
|
|
cache->space_info->flags,
|
|
num_bytes, 1);
|
|
percpu_counter_add(&cache->space_info->total_bytes_pinned,
|
|
num_bytes);
|
|
set_extent_dirty(info->pinned_extents,
|
|
bytenr, bytenr + num_bytes - 1,
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
}
|
|
|
|
spin_lock(&trans->transaction->dirty_bgs_lock);
|
|
if (list_empty(&cache->dirty_list)) {
|
|
list_add_tail(&cache->dirty_list,
|
|
&trans->transaction->dirty_bgs);
|
|
trans->transaction->num_dirty_bgs++;
|
|
btrfs_get_block_group(cache);
|
|
}
|
|
spin_unlock(&trans->transaction->dirty_bgs_lock);
|
|
|
|
/*
|
|
* No longer have used bytes in this block group, queue it for
|
|
* deletion. We do this after adding the block group to the
|
|
* dirty list to avoid races between cleaner kthread and space
|
|
* cache writeout.
|
|
*/
|
|
if (!alloc && old_val == 0) {
|
|
spin_lock(&info->unused_bgs_lock);
|
|
if (list_empty(&cache->bg_list)) {
|
|
btrfs_get_block_group(cache);
|
|
list_add_tail(&cache->bg_list,
|
|
&info->unused_bgs);
|
|
}
|
|
spin_unlock(&info->unused_bgs_lock);
|
|
}
|
|
|
|
btrfs_put_block_group(cache);
|
|
total -= num_bytes;
|
|
bytenr += num_bytes;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static u64 first_logical_byte(struct btrfs_fs_info *fs_info, u64 search_start)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
u64 bytenr;
|
|
|
|
spin_lock(&fs_info->block_group_cache_lock);
|
|
bytenr = fs_info->first_logical_byte;
|
|
spin_unlock(&fs_info->block_group_cache_lock);
|
|
|
|
if (bytenr < (u64)-1)
|
|
return bytenr;
|
|
|
|
cache = btrfs_lookup_first_block_group(fs_info, search_start);
|
|
if (!cache)
|
|
return 0;
|
|
|
|
bytenr = cache->key.objectid;
|
|
btrfs_put_block_group(cache);
|
|
|
|
return bytenr;
|
|
}
|
|
|
|
static int pin_down_extent(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_group_cache *cache,
|
|
u64 bytenr, u64 num_bytes, int reserved)
|
|
{
|
|
spin_lock(&cache->space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
cache->pinned += num_bytes;
|
|
cache->space_info->bytes_pinned += num_bytes;
|
|
if (reserved) {
|
|
cache->reserved -= num_bytes;
|
|
cache->space_info->bytes_reserved -= num_bytes;
|
|
}
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
|
|
trace_btrfs_space_reservation(fs_info, "pinned",
|
|
cache->space_info->flags, num_bytes, 1);
|
|
percpu_counter_add(&cache->space_info->total_bytes_pinned, num_bytes);
|
|
set_extent_dirty(fs_info->pinned_extents, bytenr,
|
|
bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this function must be called within transaction
|
|
*/
|
|
int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 num_bytes, int reserved)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, bytenr);
|
|
BUG_ON(!cache); /* Logic error */
|
|
|
|
pin_down_extent(fs_info, cache, bytenr, num_bytes, reserved);
|
|
|
|
btrfs_put_block_group(cache);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this function must be called within transaction
|
|
*/
|
|
int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 num_bytes)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
int ret;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, bytenr);
|
|
if (!cache)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* pull in the free space cache (if any) so that our pin
|
|
* removes the free space from the cache. We have load_only set
|
|
* to one because the slow code to read in the free extents does check
|
|
* the pinned extents.
|
|
*/
|
|
cache_block_group(cache, 1);
|
|
|
|
pin_down_extent(fs_info, cache, bytenr, num_bytes, 0);
|
|
|
|
/* remove us from the free space cache (if we're there at all) */
|
|
ret = btrfs_remove_free_space(cache, bytenr, num_bytes);
|
|
btrfs_put_block_group(cache);
|
|
return ret;
|
|
}
|
|
|
|
static int __exclude_logged_extent(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 num_bytes)
|
|
{
|
|
int ret;
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_caching_control *caching_ctl;
|
|
|
|
block_group = btrfs_lookup_block_group(fs_info, start);
|
|
if (!block_group)
|
|
return -EINVAL;
|
|
|
|
cache_block_group(block_group, 0);
|
|
caching_ctl = get_caching_control(block_group);
|
|
|
|
if (!caching_ctl) {
|
|
/* Logic error */
|
|
BUG_ON(!block_group_cache_done(block_group));
|
|
ret = btrfs_remove_free_space(block_group, start, num_bytes);
|
|
} else {
|
|
mutex_lock(&caching_ctl->mutex);
|
|
|
|
if (start >= caching_ctl->progress) {
|
|
ret = add_excluded_extent(fs_info, start, num_bytes);
|
|
} else if (start + num_bytes <= caching_ctl->progress) {
|
|
ret = btrfs_remove_free_space(block_group,
|
|
start, num_bytes);
|
|
} else {
|
|
num_bytes = caching_ctl->progress - start;
|
|
ret = btrfs_remove_free_space(block_group,
|
|
start, num_bytes);
|
|
if (ret)
|
|
goto out_lock;
|
|
|
|
num_bytes = (start + num_bytes) -
|
|
caching_ctl->progress;
|
|
start = caching_ctl->progress;
|
|
ret = add_excluded_extent(fs_info, start, num_bytes);
|
|
}
|
|
out_lock:
|
|
mutex_unlock(&caching_ctl->mutex);
|
|
put_caching_control(caching_ctl);
|
|
}
|
|
btrfs_put_block_group(block_group);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
|
|
struct extent_buffer *eb)
|
|
{
|
|
struct btrfs_file_extent_item *item;
|
|
struct btrfs_key key;
|
|
int found_type;
|
|
int i;
|
|
|
|
if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS))
|
|
return 0;
|
|
|
|
for (i = 0; i < btrfs_header_nritems(eb); i++) {
|
|
btrfs_item_key_to_cpu(eb, &key, i);
|
|
if (key.type != BTRFS_EXTENT_DATA_KEY)
|
|
continue;
|
|
item = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
|
|
found_type = btrfs_file_extent_type(eb, item);
|
|
if (found_type == BTRFS_FILE_EXTENT_INLINE)
|
|
continue;
|
|
if (btrfs_file_extent_disk_bytenr(eb, item) == 0)
|
|
continue;
|
|
key.objectid = btrfs_file_extent_disk_bytenr(eb, item);
|
|
key.offset = btrfs_file_extent_disk_num_bytes(eb, item);
|
|
__exclude_logged_extent(fs_info, key.objectid, key.offset);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
btrfs_inc_block_group_reservations(struct btrfs_block_group_cache *bg)
|
|
{
|
|
atomic_inc(&bg->reservations);
|
|
}
|
|
|
|
void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
|
|
const u64 start)
|
|
{
|
|
struct btrfs_block_group_cache *bg;
|
|
|
|
bg = btrfs_lookup_block_group(fs_info, start);
|
|
ASSERT(bg);
|
|
if (atomic_dec_and_test(&bg->reservations))
|
|
wake_up_atomic_t(&bg->reservations);
|
|
btrfs_put_block_group(bg);
|
|
}
|
|
|
|
void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg)
|
|
{
|
|
struct btrfs_space_info *space_info = bg->space_info;
|
|
|
|
ASSERT(bg->ro);
|
|
|
|
if (!(bg->flags & BTRFS_BLOCK_GROUP_DATA))
|
|
return;
|
|
|
|
/*
|
|
* Our block group is read only but before we set it to read only,
|
|
* some task might have had allocated an extent from it already, but it
|
|
* has not yet created a respective ordered extent (and added it to a
|
|
* root's list of ordered extents).
|
|
* Therefore wait for any task currently allocating extents, since the
|
|
* block group's reservations counter is incremented while a read lock
|
|
* on the groups' semaphore is held and decremented after releasing
|
|
* the read access on that semaphore and creating the ordered extent.
|
|
*/
|
|
down_write(&space_info->groups_sem);
|
|
up_write(&space_info->groups_sem);
|
|
|
|
wait_on_atomic_t(&bg->reservations, atomic_t_wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
}
|
|
|
|
/**
|
|
* btrfs_add_reserved_bytes - update the block_group and space info counters
|
|
* @cache: The cache we are manipulating
|
|
* @ram_bytes: The number of bytes of file content, and will be same to
|
|
* @num_bytes except for the compress path.
|
|
* @num_bytes: The number of bytes in question
|
|
* @delalloc: The blocks are allocated for the delalloc write
|
|
*
|
|
* This is called by the allocator when it reserves space. If this is a
|
|
* reservation and the block group has become read only we cannot make the
|
|
* reservation and return -EAGAIN, otherwise this function always succeeds.
|
|
*/
|
|
static int btrfs_add_reserved_bytes(struct btrfs_block_group_cache *cache,
|
|
u64 ram_bytes, u64 num_bytes, int delalloc)
|
|
{
|
|
struct btrfs_space_info *space_info = cache->space_info;
|
|
int ret = 0;
|
|
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
if (cache->ro) {
|
|
ret = -EAGAIN;
|
|
} else {
|
|
cache->reserved += num_bytes;
|
|
space_info->bytes_reserved += num_bytes;
|
|
|
|
trace_btrfs_space_reservation(cache->fs_info,
|
|
"space_info", space_info->flags,
|
|
ram_bytes, 0);
|
|
space_info->bytes_may_use -= ram_bytes;
|
|
if (delalloc)
|
|
cache->delalloc_bytes += num_bytes;
|
|
}
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&space_info->lock);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* btrfs_free_reserved_bytes - update the block_group and space info counters
|
|
* @cache: The cache we are manipulating
|
|
* @num_bytes: The number of bytes in question
|
|
* @delalloc: The blocks are allocated for the delalloc write
|
|
*
|
|
* This is called by somebody who is freeing space that was never actually used
|
|
* on disk. For example if you reserve some space for a new leaf in transaction
|
|
* A and before transaction A commits you free that leaf, you call this with
|
|
* reserve set to 0 in order to clear the reservation.
|
|
*/
|
|
|
|
static int btrfs_free_reserved_bytes(struct btrfs_block_group_cache *cache,
|
|
u64 num_bytes, int delalloc)
|
|
{
|
|
struct btrfs_space_info *space_info = cache->space_info;
|
|
int ret = 0;
|
|
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
if (cache->ro)
|
|
space_info->bytes_readonly += num_bytes;
|
|
cache->reserved -= num_bytes;
|
|
space_info->bytes_reserved -= num_bytes;
|
|
|
|
if (delalloc)
|
|
cache->delalloc_bytes -= num_bytes;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&space_info->lock);
|
|
return ret;
|
|
}
|
|
void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_caching_control *next;
|
|
struct btrfs_caching_control *caching_ctl;
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
down_write(&fs_info->commit_root_sem);
|
|
|
|
list_for_each_entry_safe(caching_ctl, next,
|
|
&fs_info->caching_block_groups, list) {
|
|
cache = caching_ctl->block_group;
|
|
if (block_group_cache_done(cache)) {
|
|
cache->last_byte_to_unpin = (u64)-1;
|
|
list_del_init(&caching_ctl->list);
|
|
put_caching_control(caching_ctl);
|
|
} else {
|
|
cache->last_byte_to_unpin = caching_ctl->progress;
|
|
}
|
|
}
|
|
|
|
if (fs_info->pinned_extents == &fs_info->freed_extents[0])
|
|
fs_info->pinned_extents = &fs_info->freed_extents[1];
|
|
else
|
|
fs_info->pinned_extents = &fs_info->freed_extents[0];
|
|
|
|
up_write(&fs_info->commit_root_sem);
|
|
|
|
update_global_block_rsv(fs_info);
|
|
}
|
|
|
|
/*
|
|
* Returns the free cluster for the given space info and sets empty_cluster to
|
|
* what it should be based on the mount options.
|
|
*/
|
|
static struct btrfs_free_cluster *
|
|
fetch_cluster_info(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *space_info, u64 *empty_cluster)
|
|
{
|
|
struct btrfs_free_cluster *ret = NULL;
|
|
|
|
*empty_cluster = 0;
|
|
if (btrfs_mixed_space_info(space_info))
|
|
return ret;
|
|
|
|
if (space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
|
|
ret = &fs_info->meta_alloc_cluster;
|
|
if (btrfs_test_opt(fs_info, SSD))
|
|
*empty_cluster = SZ_2M;
|
|
else
|
|
*empty_cluster = SZ_64K;
|
|
} else if ((space_info->flags & BTRFS_BLOCK_GROUP_DATA) &&
|
|
btrfs_test_opt(fs_info, SSD_SPREAD)) {
|
|
*empty_cluster = SZ_2M;
|
|
ret = &fs_info->data_alloc_cluster;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int unpin_extent_range(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 end,
|
|
const bool return_free_space)
|
|
{
|
|
struct btrfs_block_group_cache *cache = NULL;
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
struct btrfs_free_cluster *cluster = NULL;
|
|
u64 len;
|
|
u64 total_unpinned = 0;
|
|
u64 empty_cluster = 0;
|
|
bool readonly;
|
|
|
|
while (start <= end) {
|
|
readonly = false;
|
|
if (!cache ||
|
|
start >= cache->key.objectid + cache->key.offset) {
|
|
if (cache)
|
|
btrfs_put_block_group(cache);
|
|
total_unpinned = 0;
|
|
cache = btrfs_lookup_block_group(fs_info, start);
|
|
BUG_ON(!cache); /* Logic error */
|
|
|
|
cluster = fetch_cluster_info(fs_info,
|
|
cache->space_info,
|
|
&empty_cluster);
|
|
empty_cluster <<= 1;
|
|
}
|
|
|
|
len = cache->key.objectid + cache->key.offset - start;
|
|
len = min(len, end + 1 - start);
|
|
|
|
if (start < cache->last_byte_to_unpin) {
|
|
len = min(len, cache->last_byte_to_unpin - start);
|
|
if (return_free_space)
|
|
btrfs_add_free_space(cache, start, len);
|
|
}
|
|
|
|
start += len;
|
|
total_unpinned += len;
|
|
space_info = cache->space_info;
|
|
|
|
/*
|
|
* If this space cluster has been marked as fragmented and we've
|
|
* unpinned enough in this block group to potentially allow a
|
|
* cluster to be created inside of it go ahead and clear the
|
|
* fragmented check.
|
|
*/
|
|
if (cluster && cluster->fragmented &&
|
|
total_unpinned > empty_cluster) {
|
|
spin_lock(&cluster->lock);
|
|
cluster->fragmented = 0;
|
|
spin_unlock(&cluster->lock);
|
|
}
|
|
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
cache->pinned -= len;
|
|
space_info->bytes_pinned -= len;
|
|
|
|
trace_btrfs_space_reservation(fs_info, "pinned",
|
|
space_info->flags, len, 0);
|
|
space_info->max_extent_size = 0;
|
|
percpu_counter_add(&space_info->total_bytes_pinned, -len);
|
|
if (cache->ro) {
|
|
space_info->bytes_readonly += len;
|
|
readonly = true;
|
|
}
|
|
spin_unlock(&cache->lock);
|
|
if (!readonly && return_free_space &&
|
|
global_rsv->space_info == space_info) {
|
|
u64 to_add = len;
|
|
|
|
spin_lock(&global_rsv->lock);
|
|
if (!global_rsv->full) {
|
|
to_add = min(len, global_rsv->size -
|
|
global_rsv->reserved);
|
|
global_rsv->reserved += to_add;
|
|
space_info->bytes_may_use += to_add;
|
|
if (global_rsv->reserved >= global_rsv->size)
|
|
global_rsv->full = 1;
|
|
trace_btrfs_space_reservation(fs_info,
|
|
"space_info",
|
|
space_info->flags,
|
|
to_add, 1);
|
|
len -= to_add;
|
|
}
|
|
spin_unlock(&global_rsv->lock);
|
|
/* Add to any tickets we may have */
|
|
if (len)
|
|
space_info_add_new_bytes(fs_info, space_info,
|
|
len);
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
}
|
|
|
|
if (cache)
|
|
btrfs_put_block_group(cache);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group_cache *block_group, *tmp;
|
|
struct list_head *deleted_bgs;
|
|
struct extent_io_tree *unpin;
|
|
u64 start;
|
|
u64 end;
|
|
int ret;
|
|
|
|
if (fs_info->pinned_extents == &fs_info->freed_extents[0])
|
|
unpin = &fs_info->freed_extents[1];
|
|
else
|
|
unpin = &fs_info->freed_extents[0];
|
|
|
|
while (!trans->aborted) {
|
|
mutex_lock(&fs_info->unused_bg_unpin_mutex);
|
|
ret = find_first_extent_bit(unpin, 0, &start, &end,
|
|
EXTENT_DIRTY, NULL);
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
break;
|
|
}
|
|
|
|
if (btrfs_test_opt(fs_info, DISCARD))
|
|
ret = btrfs_discard_extent(fs_info, start,
|
|
end + 1 - start, NULL);
|
|
|
|
clear_extent_dirty(unpin, start, end);
|
|
unpin_extent_range(fs_info, start, end, true);
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
cond_resched();
|
|
}
|
|
|
|
/*
|
|
* Transaction is finished. We don't need the lock anymore. We
|
|
* do need to clean up the block groups in case of a transaction
|
|
* abort.
|
|
*/
|
|
deleted_bgs = &trans->transaction->deleted_bgs;
|
|
list_for_each_entry_safe(block_group, tmp, deleted_bgs, bg_list) {
|
|
u64 trimmed = 0;
|
|
|
|
ret = -EROFS;
|
|
if (!trans->aborted)
|
|
ret = btrfs_discard_extent(fs_info,
|
|
block_group->key.objectid,
|
|
block_group->key.offset,
|
|
&trimmed);
|
|
|
|
list_del_init(&block_group->bg_list);
|
|
btrfs_put_block_group_trimming(block_group);
|
|
btrfs_put_block_group(block_group);
|
|
|
|
if (ret) {
|
|
const char *errstr = btrfs_decode_error(ret);
|
|
btrfs_warn(fs_info,
|
|
"discard failed while removing blockgroup: errno=%d %s",
|
|
ret, errstr);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *info,
|
|
struct btrfs_delayed_ref_node *node, u64 parent,
|
|
u64 root_objectid, u64 owner_objectid,
|
|
u64 owner_offset, int refs_to_drop,
|
|
struct btrfs_delayed_extent_op *extent_op)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_path *path;
|
|
struct btrfs_root *extent_root = info->extent_root;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_extent_item *ei;
|
|
struct btrfs_extent_inline_ref *iref;
|
|
int ret;
|
|
int is_data;
|
|
int extent_slot = 0;
|
|
int found_extent = 0;
|
|
int num_to_del = 1;
|
|
u32 item_size;
|
|
u64 refs;
|
|
u64 bytenr = node->bytenr;
|
|
u64 num_bytes = node->num_bytes;
|
|
int last_ref = 0;
|
|
bool skinny_metadata = btrfs_fs_incompat(info, SKINNY_METADATA);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->reada = READA_FORWARD;
|
|
path->leave_spinning = 1;
|
|
|
|
is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID;
|
|
BUG_ON(!is_data && refs_to_drop != 1);
|
|
|
|
if (is_data)
|
|
skinny_metadata = false;
|
|
|
|
ret = lookup_extent_backref(trans, info, path, &iref,
|
|
bytenr, num_bytes, parent,
|
|
root_objectid, owner_objectid,
|
|
owner_offset);
|
|
if (ret == 0) {
|
|
extent_slot = path->slots[0];
|
|
while (extent_slot >= 0) {
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key,
|
|
extent_slot);
|
|
if (key.objectid != bytenr)
|
|
break;
|
|
if (key.type == BTRFS_EXTENT_ITEM_KEY &&
|
|
key.offset == num_bytes) {
|
|
found_extent = 1;
|
|
break;
|
|
}
|
|
if (key.type == BTRFS_METADATA_ITEM_KEY &&
|
|
key.offset == owner_objectid) {
|
|
found_extent = 1;
|
|
break;
|
|
}
|
|
if (path->slots[0] - extent_slot > 5)
|
|
break;
|
|
extent_slot--;
|
|
}
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
item_size = btrfs_item_size_nr(path->nodes[0], extent_slot);
|
|
if (found_extent && item_size < sizeof(*ei))
|
|
found_extent = 0;
|
|
#endif
|
|
if (!found_extent) {
|
|
BUG_ON(iref);
|
|
ret = remove_extent_backref(trans, info, path, NULL,
|
|
refs_to_drop,
|
|
is_data, &last_ref);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
btrfs_release_path(path);
|
|
path->leave_spinning = 1;
|
|
|
|
key.objectid = bytenr;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = num_bytes;
|
|
|
|
if (!is_data && skinny_metadata) {
|
|
key.type = BTRFS_METADATA_ITEM_KEY;
|
|
key.offset = owner_objectid;
|
|
}
|
|
|
|
ret = btrfs_search_slot(trans, extent_root,
|
|
&key, path, -1, 1);
|
|
if (ret > 0 && skinny_metadata && path->slots[0]) {
|
|
/*
|
|
* Couldn't find our skinny metadata item,
|
|
* see if we have ye olde extent item.
|
|
*/
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key,
|
|
path->slots[0]);
|
|
if (key.objectid == bytenr &&
|
|
key.type == BTRFS_EXTENT_ITEM_KEY &&
|
|
key.offset == num_bytes)
|
|
ret = 0;
|
|
}
|
|
|
|
if (ret > 0 && skinny_metadata) {
|
|
skinny_metadata = false;
|
|
key.objectid = bytenr;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = num_bytes;
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot(trans, extent_root,
|
|
&key, path, -1, 1);
|
|
}
|
|
|
|
if (ret) {
|
|
btrfs_err(info,
|
|
"umm, got %d back from search, was looking for %llu",
|
|
ret, bytenr);
|
|
if (ret > 0)
|
|
btrfs_print_leaf(path->nodes[0]);
|
|
}
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
extent_slot = path->slots[0];
|
|
}
|
|
} else if (WARN_ON(ret == -ENOENT)) {
|
|
btrfs_print_leaf(path->nodes[0]);
|
|
btrfs_err(info,
|
|
"unable to find ref byte nr %llu parent %llu root %llu owner %llu offset %llu",
|
|
bytenr, parent, root_objectid, owner_objectid,
|
|
owner_offset);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
} else {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, extent_slot);
|
|
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
|
|
if (item_size < sizeof(*ei)) {
|
|
BUG_ON(found_extent || extent_slot != path->slots[0]);
|
|
ret = convert_extent_item_v0(trans, info, path, owner_objectid,
|
|
0);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
btrfs_release_path(path);
|
|
path->leave_spinning = 1;
|
|
|
|
key.objectid = bytenr;
|
|
key.type = BTRFS_EXTENT_ITEM_KEY;
|
|
key.offset = num_bytes;
|
|
|
|
ret = btrfs_search_slot(trans, extent_root, &key, path,
|
|
-1, 1);
|
|
if (ret) {
|
|
btrfs_err(info,
|
|
"umm, got %d back from search, was looking for %llu",
|
|
ret, bytenr);
|
|
btrfs_print_leaf(path->nodes[0]);
|
|
}
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
extent_slot = path->slots[0];
|
|
leaf = path->nodes[0];
|
|
item_size = btrfs_item_size_nr(leaf, extent_slot);
|
|
}
|
|
#endif
|
|
BUG_ON(item_size < sizeof(*ei));
|
|
ei = btrfs_item_ptr(leaf, extent_slot,
|
|
struct btrfs_extent_item);
|
|
if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID &&
|
|
key.type == BTRFS_EXTENT_ITEM_KEY) {
|
|
struct btrfs_tree_block_info *bi;
|
|
BUG_ON(item_size < sizeof(*ei) + sizeof(*bi));
|
|
bi = (struct btrfs_tree_block_info *)(ei + 1);
|
|
WARN_ON(owner_objectid != btrfs_tree_block_level(leaf, bi));
|
|
}
|
|
|
|
refs = btrfs_extent_refs(leaf, ei);
|
|
if (refs < refs_to_drop) {
|
|
btrfs_err(info,
|
|
"trying to drop %d refs but we only have %Lu for bytenr %Lu",
|
|
refs_to_drop, refs, bytenr);
|
|
ret = -EINVAL;
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
refs -= refs_to_drop;
|
|
|
|
if (refs > 0) {
|
|
if (extent_op)
|
|
__run_delayed_extent_op(extent_op, leaf, ei);
|
|
/*
|
|
* In the case of inline back ref, reference count will
|
|
* be updated by remove_extent_backref
|
|
*/
|
|
if (iref) {
|
|
BUG_ON(!found_extent);
|
|
} else {
|
|
btrfs_set_extent_refs(leaf, ei, refs);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
}
|
|
if (found_extent) {
|
|
ret = remove_extent_backref(trans, info, path,
|
|
iref, refs_to_drop,
|
|
is_data, &last_ref);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
}
|
|
} else {
|
|
if (found_extent) {
|
|
BUG_ON(is_data && refs_to_drop !=
|
|
extent_data_ref_count(path, iref));
|
|
if (iref) {
|
|
BUG_ON(path->slots[0] != extent_slot);
|
|
} else {
|
|
BUG_ON(path->slots[0] != extent_slot + 1);
|
|
path->slots[0] = extent_slot;
|
|
num_to_del = 2;
|
|
}
|
|
}
|
|
|
|
last_ref = 1;
|
|
ret = btrfs_del_items(trans, extent_root, path, path->slots[0],
|
|
num_to_del);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (is_data) {
|
|
ret = btrfs_del_csums(trans, info, bytenr, num_bytes);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = add_to_free_space_tree(trans, info, bytenr, num_bytes);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = update_block_group(trans, info, bytenr, num_bytes, 0);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* when we free an block, it is possible (and likely) that we free the last
|
|
* delayed ref for that extent as well. This searches the delayed ref tree for
|
|
* a given extent, and if there are no other delayed refs to be processed, it
|
|
* removes it from the tree.
|
|
*/
|
|
static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
|
|
u64 bytenr)
|
|
{
|
|
struct btrfs_delayed_ref_head *head;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
int ret = 0;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
spin_lock(&delayed_refs->lock);
|
|
head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
|
|
if (!head)
|
|
goto out_delayed_unlock;
|
|
|
|
spin_lock(&head->lock);
|
|
if (!RB_EMPTY_ROOT(&head->ref_tree))
|
|
goto out;
|
|
|
|
if (head->extent_op) {
|
|
if (!head->must_insert_reserved)
|
|
goto out;
|
|
btrfs_free_delayed_extent_op(head->extent_op);
|
|
head->extent_op = NULL;
|
|
}
|
|
|
|
/*
|
|
* waiting for the lock here would deadlock. If someone else has it
|
|
* locked they are already in the process of dropping it anyway
|
|
*/
|
|
if (!mutex_trylock(&head->mutex))
|
|
goto out;
|
|
|
|
/*
|
|
* at this point we have a head with no other entries. Go
|
|
* ahead and process it.
|
|
*/
|
|
rb_erase(&head->href_node, &delayed_refs->href_root);
|
|
RB_CLEAR_NODE(&head->href_node);
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
|
|
/*
|
|
* we don't take a ref on the node because we're removing it from the
|
|
* tree, so we just steal the ref the tree was holding.
|
|
*/
|
|
delayed_refs->num_heads--;
|
|
if (head->processing == 0)
|
|
delayed_refs->num_heads_ready--;
|
|
head->processing = 0;
|
|
spin_unlock(&head->lock);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
BUG_ON(head->extent_op);
|
|
if (head->must_insert_reserved)
|
|
ret = 1;
|
|
|
|
mutex_unlock(&head->mutex);
|
|
btrfs_put_delayed_ref_head(head);
|
|
return ret;
|
|
out:
|
|
spin_unlock(&head->lock);
|
|
|
|
out_delayed_unlock:
|
|
spin_unlock(&delayed_refs->lock);
|
|
return 0;
|
|
}
|
|
|
|
void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct extent_buffer *buf,
|
|
u64 parent, int last_ref)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int pin = 1;
|
|
int ret;
|
|
|
|
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
|
|
int old_ref_mod, new_ref_mod;
|
|
|
|
btrfs_ref_tree_mod(root, buf->start, buf->len, parent,
|
|
root->root_key.objectid,
|
|
btrfs_header_level(buf), 0,
|
|
BTRFS_DROP_DELAYED_REF);
|
|
ret = btrfs_add_delayed_tree_ref(fs_info, trans, buf->start,
|
|
buf->len, parent,
|
|
root->root_key.objectid,
|
|
btrfs_header_level(buf),
|
|
BTRFS_DROP_DELAYED_REF, NULL,
|
|
&old_ref_mod, &new_ref_mod);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
pin = old_ref_mod >= 0 && new_ref_mod < 0;
|
|
}
|
|
|
|
if (last_ref && btrfs_header_generation(buf) == trans->transid) {
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
|
|
ret = check_ref_cleanup(trans, buf->start);
|
|
if (!ret)
|
|
goto out;
|
|
}
|
|
|
|
pin = 0;
|
|
cache = btrfs_lookup_block_group(fs_info, buf->start);
|
|
|
|
if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
|
|
pin_down_extent(fs_info, cache, buf->start,
|
|
buf->len, 1);
|
|
btrfs_put_block_group(cache);
|
|
goto out;
|
|
}
|
|
|
|
WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags));
|
|
|
|
btrfs_add_free_space(cache, buf->start, buf->len);
|
|
btrfs_free_reserved_bytes(cache, buf->len, 0);
|
|
btrfs_put_block_group(cache);
|
|
trace_btrfs_reserved_extent_free(fs_info, buf->start, buf->len);
|
|
}
|
|
out:
|
|
if (pin)
|
|
add_pinned_bytes(fs_info, buf->len, btrfs_header_level(buf),
|
|
root->root_key.objectid);
|
|
|
|
if (last_ref) {
|
|
/*
|
|
* Deleting the buffer, clear the corrupt flag since it doesn't
|
|
* matter anymore.
|
|
*/
|
|
clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags);
|
|
}
|
|
}
|
|
|
|
/* Can return -ENOMEM */
|
|
int btrfs_free_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
|
|
u64 owner, u64 offset)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int old_ref_mod, new_ref_mod;
|
|
int ret;
|
|
|
|
if (btrfs_is_testing(fs_info))
|
|
return 0;
|
|
|
|
if (root_objectid != BTRFS_TREE_LOG_OBJECTID)
|
|
btrfs_ref_tree_mod(root, bytenr, num_bytes, parent,
|
|
root_objectid, owner, offset,
|
|
BTRFS_DROP_DELAYED_REF);
|
|
|
|
/*
|
|
* tree log blocks never actually go into the extent allocation
|
|
* tree, just update pinning info and exit early.
|
|
*/
|
|
if (root_objectid == BTRFS_TREE_LOG_OBJECTID) {
|
|
WARN_ON(owner >= BTRFS_FIRST_FREE_OBJECTID);
|
|
/* unlocks the pinned mutex */
|
|
btrfs_pin_extent(fs_info, bytenr, num_bytes, 1);
|
|
old_ref_mod = new_ref_mod = 0;
|
|
ret = 0;
|
|
} else if (owner < BTRFS_FIRST_FREE_OBJECTID) {
|
|
ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
|
|
num_bytes, parent,
|
|
root_objectid, (int)owner,
|
|
BTRFS_DROP_DELAYED_REF, NULL,
|
|
&old_ref_mod, &new_ref_mod);
|
|
} else {
|
|
ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
|
|
num_bytes, parent,
|
|
root_objectid, owner, offset,
|
|
0, BTRFS_DROP_DELAYED_REF,
|
|
&old_ref_mod, &new_ref_mod);
|
|
}
|
|
|
|
if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0)
|
|
add_pinned_bytes(fs_info, num_bytes, owner, root_objectid);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* when we wait for progress in the block group caching, its because
|
|
* our allocation attempt failed at least once. So, we must sleep
|
|
* and let some progress happen before we try again.
|
|
*
|
|
* This function will sleep at least once waiting for new free space to
|
|
* show up, and then it will check the block group free space numbers
|
|
* for our min num_bytes. Another option is to have it go ahead
|
|
* and look in the rbtree for a free extent of a given size, but this
|
|
* is a good start.
|
|
*
|
|
* Callers of this must check if cache->cached == BTRFS_CACHE_ERROR before using
|
|
* any of the information in this block group.
|
|
*/
|
|
static noinline void
|
|
wait_block_group_cache_progress(struct btrfs_block_group_cache *cache,
|
|
u64 num_bytes)
|
|
{
|
|
struct btrfs_caching_control *caching_ctl;
|
|
|
|
caching_ctl = get_caching_control(cache);
|
|
if (!caching_ctl)
|
|
return;
|
|
|
|
wait_event(caching_ctl->wait, block_group_cache_done(cache) ||
|
|
(cache->free_space_ctl->free_space >= num_bytes));
|
|
|
|
put_caching_control(caching_ctl);
|
|
}
|
|
|
|
static noinline int
|
|
wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
|
|
{
|
|
struct btrfs_caching_control *caching_ctl;
|
|
int ret = 0;
|
|
|
|
caching_ctl = get_caching_control(cache);
|
|
if (!caching_ctl)
|
|
return (cache->cached == BTRFS_CACHE_ERROR) ? -EIO : 0;
|
|
|
|
wait_event(caching_ctl->wait, block_group_cache_done(cache));
|
|
if (cache->cached == BTRFS_CACHE_ERROR)
|
|
ret = -EIO;
|
|
put_caching_control(caching_ctl);
|
|
return ret;
|
|
}
|
|
|
|
int __get_raid_index(u64 flags)
|
|
{
|
|
if (flags & BTRFS_BLOCK_GROUP_RAID10)
|
|
return BTRFS_RAID_RAID10;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID1)
|
|
return BTRFS_RAID_RAID1;
|
|
else if (flags & BTRFS_BLOCK_GROUP_DUP)
|
|
return BTRFS_RAID_DUP;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID0)
|
|
return BTRFS_RAID_RAID0;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID5)
|
|
return BTRFS_RAID_RAID5;
|
|
else if (flags & BTRFS_BLOCK_GROUP_RAID6)
|
|
return BTRFS_RAID_RAID6;
|
|
|
|
return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
|
|
}
|
|
|
|
int get_block_group_index(struct btrfs_block_group_cache *cache)
|
|
{
|
|
return __get_raid_index(cache->flags);
|
|
}
|
|
|
|
static const char *btrfs_raid_type_names[BTRFS_NR_RAID_TYPES] = {
|
|
[BTRFS_RAID_RAID10] = "raid10",
|
|
[BTRFS_RAID_RAID1] = "raid1",
|
|
[BTRFS_RAID_DUP] = "dup",
|
|
[BTRFS_RAID_RAID0] = "raid0",
|
|
[BTRFS_RAID_SINGLE] = "single",
|
|
[BTRFS_RAID_RAID5] = "raid5",
|
|
[BTRFS_RAID_RAID6] = "raid6",
|
|
};
|
|
|
|
static const char *get_raid_name(enum btrfs_raid_types type)
|
|
{
|
|
if (type >= BTRFS_NR_RAID_TYPES)
|
|
return NULL;
|
|
|
|
return btrfs_raid_type_names[type];
|
|
}
|
|
|
|
enum btrfs_loop_type {
|
|
LOOP_CACHING_NOWAIT = 0,
|
|
LOOP_CACHING_WAIT = 1,
|
|
LOOP_ALLOC_CHUNK = 2,
|
|
LOOP_NO_EMPTY_SIZE = 3,
|
|
};
|
|
|
|
static inline void
|
|
btrfs_lock_block_group(struct btrfs_block_group_cache *cache,
|
|
int delalloc)
|
|
{
|
|
if (delalloc)
|
|
down_read(&cache->data_rwsem);
|
|
}
|
|
|
|
static inline void
|
|
btrfs_grab_block_group(struct btrfs_block_group_cache *cache,
|
|
int delalloc)
|
|
{
|
|
btrfs_get_block_group(cache);
|
|
if (delalloc)
|
|
down_read(&cache->data_rwsem);
|
|
}
|
|
|
|
static struct btrfs_block_group_cache *
|
|
btrfs_lock_cluster(struct btrfs_block_group_cache *block_group,
|
|
struct btrfs_free_cluster *cluster,
|
|
int delalloc)
|
|
{
|
|
struct btrfs_block_group_cache *used_bg = NULL;
|
|
|
|
spin_lock(&cluster->refill_lock);
|
|
while (1) {
|
|
used_bg = cluster->block_group;
|
|
if (!used_bg)
|
|
return NULL;
|
|
|
|
if (used_bg == block_group)
|
|
return used_bg;
|
|
|
|
btrfs_get_block_group(used_bg);
|
|
|
|
if (!delalloc)
|
|
return used_bg;
|
|
|
|
if (down_read_trylock(&used_bg->data_rwsem))
|
|
return used_bg;
|
|
|
|
spin_unlock(&cluster->refill_lock);
|
|
|
|
/* We should only have one-level nested. */
|
|
down_read_nested(&used_bg->data_rwsem, SINGLE_DEPTH_NESTING);
|
|
|
|
spin_lock(&cluster->refill_lock);
|
|
if (used_bg == cluster->block_group)
|
|
return used_bg;
|
|
|
|
up_read(&used_bg->data_rwsem);
|
|
btrfs_put_block_group(used_bg);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
btrfs_release_block_group(struct btrfs_block_group_cache *cache,
|
|
int delalloc)
|
|
{
|
|
if (delalloc)
|
|
up_read(&cache->data_rwsem);
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
/*
|
|
* walks the btree of allocated extents and find a hole of a given size.
|
|
* The key ins is changed to record the hole:
|
|
* ins->objectid == start position
|
|
* ins->flags = BTRFS_EXTENT_ITEM_KEY
|
|
* ins->offset == the size of the hole.
|
|
* Any available blocks before search_start are skipped.
|
|
*
|
|
* If there is no suitable free space, we will record the max size of
|
|
* the free space extent currently.
|
|
*/
|
|
static noinline int find_free_extent(struct btrfs_fs_info *fs_info,
|
|
u64 ram_bytes, u64 num_bytes, u64 empty_size,
|
|
u64 hint_byte, struct btrfs_key *ins,
|
|
u64 flags, int delalloc)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_free_cluster *last_ptr = NULL;
|
|
struct btrfs_block_group_cache *block_group = NULL;
|
|
u64 search_start = 0;
|
|
u64 max_extent_size = 0;
|
|
u64 empty_cluster = 0;
|
|
struct btrfs_space_info *space_info;
|
|
int loop = 0;
|
|
int index = __get_raid_index(flags);
|
|
bool failed_cluster_refill = false;
|
|
bool failed_alloc = false;
|
|
bool use_cluster = true;
|
|
bool have_caching_bg = false;
|
|
bool orig_have_caching_bg = false;
|
|
bool full_search = false;
|
|
|
|
WARN_ON(num_bytes < fs_info->sectorsize);
|
|
ins->type = BTRFS_EXTENT_ITEM_KEY;
|
|
ins->objectid = 0;
|
|
ins->offset = 0;
|
|
|
|
trace_find_free_extent(fs_info, num_bytes, empty_size, flags);
|
|
|
|
space_info = __find_space_info(fs_info, flags);
|
|
if (!space_info) {
|
|
btrfs_err(fs_info, "No space info for %llu", flags);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/*
|
|
* If our free space is heavily fragmented we may not be able to make
|
|
* big contiguous allocations, so instead of doing the expensive search
|
|
* for free space, simply return ENOSPC with our max_extent_size so we
|
|
* can go ahead and search for a more manageable chunk.
|
|
*
|
|
* If our max_extent_size is large enough for our allocation simply
|
|
* disable clustering since we will likely not be able to find enough
|
|
* space to create a cluster and induce latency trying.
|
|
*/
|
|
if (unlikely(space_info->max_extent_size)) {
|
|
spin_lock(&space_info->lock);
|
|
if (space_info->max_extent_size &&
|
|
num_bytes > space_info->max_extent_size) {
|
|
ins->offset = space_info->max_extent_size;
|
|
spin_unlock(&space_info->lock);
|
|
return -ENOSPC;
|
|
} else if (space_info->max_extent_size) {
|
|
use_cluster = false;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
}
|
|
|
|
last_ptr = fetch_cluster_info(fs_info, space_info, &empty_cluster);
|
|
if (last_ptr) {
|
|
spin_lock(&last_ptr->lock);
|
|
if (last_ptr->block_group)
|
|
hint_byte = last_ptr->window_start;
|
|
if (last_ptr->fragmented) {
|
|
/*
|
|
* We still set window_start so we can keep track of the
|
|
* last place we found an allocation to try and save
|
|
* some time.
|
|
*/
|
|
hint_byte = last_ptr->window_start;
|
|
use_cluster = false;
|
|
}
|
|
spin_unlock(&last_ptr->lock);
|
|
}
|
|
|
|
search_start = max(search_start, first_logical_byte(fs_info, 0));
|
|
search_start = max(search_start, hint_byte);
|
|
if (search_start == hint_byte) {
|
|
block_group = btrfs_lookup_block_group(fs_info, search_start);
|
|
/*
|
|
* we don't want to use the block group if it doesn't match our
|
|
* allocation bits, or if its not cached.
|
|
*
|
|
* However if we are re-searching with an ideal block group
|
|
* picked out then we don't care that the block group is cached.
|
|
*/
|
|
if (block_group && block_group_bits(block_group, flags) &&
|
|
block_group->cached != BTRFS_CACHE_NO) {
|
|
down_read(&space_info->groups_sem);
|
|
if (list_empty(&block_group->list) ||
|
|
block_group->ro) {
|
|
/*
|
|
* someone is removing this block group,
|
|
* we can't jump into the have_block_group
|
|
* target because our list pointers are not
|
|
* valid
|
|
*/
|
|
btrfs_put_block_group(block_group);
|
|
up_read(&space_info->groups_sem);
|
|
} else {
|
|
index = get_block_group_index(block_group);
|
|
btrfs_lock_block_group(block_group, delalloc);
|
|
goto have_block_group;
|
|
}
|
|
} else if (block_group) {
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
}
|
|
search:
|
|
have_caching_bg = false;
|
|
if (index == 0 || index == __get_raid_index(flags))
|
|
full_search = true;
|
|
down_read(&space_info->groups_sem);
|
|
list_for_each_entry(block_group, &space_info->block_groups[index],
|
|
list) {
|
|
u64 offset;
|
|
int cached;
|
|
|
|
/* If the block group is read-only, we can skip it entirely. */
|
|
if (unlikely(block_group->ro))
|
|
continue;
|
|
|
|
btrfs_grab_block_group(block_group, delalloc);
|
|
search_start = block_group->key.objectid;
|
|
|
|
/*
|
|
* this can happen if we end up cycling through all the
|
|
* raid types, but we want to make sure we only allocate
|
|
* for the proper type.
|
|
*/
|
|
if (!block_group_bits(block_group, flags)) {
|
|
u64 extra = BTRFS_BLOCK_GROUP_DUP |
|
|
BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6 |
|
|
BTRFS_BLOCK_GROUP_RAID10;
|
|
|
|
/*
|
|
* if they asked for extra copies and this block group
|
|
* doesn't provide them, bail. This does allow us to
|
|
* fill raid0 from raid1.
|
|
*/
|
|
if ((flags & extra) && !(block_group->flags & extra))
|
|
goto loop;
|
|
}
|
|
|
|
have_block_group:
|
|
cached = block_group_cache_done(block_group);
|
|
if (unlikely(!cached)) {
|
|
have_caching_bg = true;
|
|
ret = cache_block_group(block_group, 0);
|
|
BUG_ON(ret < 0);
|
|
ret = 0;
|
|
}
|
|
|
|
if (unlikely(block_group->cached == BTRFS_CACHE_ERROR))
|
|
goto loop;
|
|
|
|
/*
|
|
* Ok we want to try and use the cluster allocator, so
|
|
* lets look there
|
|
*/
|
|
if (last_ptr && use_cluster) {
|
|
struct btrfs_block_group_cache *used_block_group;
|
|
unsigned long aligned_cluster;
|
|
/*
|
|
* the refill lock keeps out other
|
|
* people trying to start a new cluster
|
|
*/
|
|
used_block_group = btrfs_lock_cluster(block_group,
|
|
last_ptr,
|
|
delalloc);
|
|
if (!used_block_group)
|
|
goto refill_cluster;
|
|
|
|
if (used_block_group != block_group &&
|
|
(used_block_group->ro ||
|
|
!block_group_bits(used_block_group, flags)))
|
|
goto release_cluster;
|
|
|
|
offset = btrfs_alloc_from_cluster(used_block_group,
|
|
last_ptr,
|
|
num_bytes,
|
|
used_block_group->key.objectid,
|
|
&max_extent_size);
|
|
if (offset) {
|
|
/* we have a block, we're done */
|
|
spin_unlock(&last_ptr->refill_lock);
|
|
trace_btrfs_reserve_extent_cluster(fs_info,
|
|
used_block_group,
|
|
search_start, num_bytes);
|
|
if (used_block_group != block_group) {
|
|
btrfs_release_block_group(block_group,
|
|
delalloc);
|
|
block_group = used_block_group;
|
|
}
|
|
goto checks;
|
|
}
|
|
|
|
WARN_ON(last_ptr->block_group != used_block_group);
|
|
release_cluster:
|
|
/* If we are on LOOP_NO_EMPTY_SIZE, we can't
|
|
* set up a new clusters, so lets just skip it
|
|
* and let the allocator find whatever block
|
|
* it can find. If we reach this point, we
|
|
* will have tried the cluster allocator
|
|
* plenty of times and not have found
|
|
* anything, so we are likely way too
|
|
* fragmented for the clustering stuff to find
|
|
* anything.
|
|
*
|
|
* However, if the cluster is taken from the
|
|
* current block group, release the cluster
|
|
* first, so that we stand a better chance of
|
|
* succeeding in the unclustered
|
|
* allocation. */
|
|
if (loop >= LOOP_NO_EMPTY_SIZE &&
|
|
used_block_group != block_group) {
|
|
spin_unlock(&last_ptr->refill_lock);
|
|
btrfs_release_block_group(used_block_group,
|
|
delalloc);
|
|
goto unclustered_alloc;
|
|
}
|
|
|
|
/*
|
|
* this cluster didn't work out, free it and
|
|
* start over
|
|
*/
|
|
btrfs_return_cluster_to_free_space(NULL, last_ptr);
|
|
|
|
if (used_block_group != block_group)
|
|
btrfs_release_block_group(used_block_group,
|
|
delalloc);
|
|
refill_cluster:
|
|
if (loop >= LOOP_NO_EMPTY_SIZE) {
|
|
spin_unlock(&last_ptr->refill_lock);
|
|
goto unclustered_alloc;
|
|
}
|
|
|
|
aligned_cluster = max_t(unsigned long,
|
|
empty_cluster + empty_size,
|
|
block_group->full_stripe_len);
|
|
|
|
/* allocate a cluster in this block group */
|
|
ret = btrfs_find_space_cluster(fs_info, block_group,
|
|
last_ptr, search_start,
|
|
num_bytes,
|
|
aligned_cluster);
|
|
if (ret == 0) {
|
|
/*
|
|
* now pull our allocation out of this
|
|
* cluster
|
|
*/
|
|
offset = btrfs_alloc_from_cluster(block_group,
|
|
last_ptr,
|
|
num_bytes,
|
|
search_start,
|
|
&max_extent_size);
|
|
if (offset) {
|
|
/* we found one, proceed */
|
|
spin_unlock(&last_ptr->refill_lock);
|
|
trace_btrfs_reserve_extent_cluster(fs_info,
|
|
block_group, search_start,
|
|
num_bytes);
|
|
goto checks;
|
|
}
|
|
} else if (!cached && loop > LOOP_CACHING_NOWAIT
|
|
&& !failed_cluster_refill) {
|
|
spin_unlock(&last_ptr->refill_lock);
|
|
|
|
failed_cluster_refill = true;
|
|
wait_block_group_cache_progress(block_group,
|
|
num_bytes + empty_cluster + empty_size);
|
|
goto have_block_group;
|
|
}
|
|
|
|
/*
|
|
* at this point we either didn't find a cluster
|
|
* or we weren't able to allocate a block from our
|
|
* cluster. Free the cluster we've been trying
|
|
* to use, and go to the next block group
|
|
*/
|
|
btrfs_return_cluster_to_free_space(NULL, last_ptr);
|
|
spin_unlock(&last_ptr->refill_lock);
|
|
goto loop;
|
|
}
|
|
|
|
unclustered_alloc:
|
|
/*
|
|
* We are doing an unclustered alloc, set the fragmented flag so
|
|
* we don't bother trying to setup a cluster again until we get
|
|
* more space.
|
|
*/
|
|
if (unlikely(last_ptr)) {
|
|
spin_lock(&last_ptr->lock);
|
|
last_ptr->fragmented = 1;
|
|
spin_unlock(&last_ptr->lock);
|
|
}
|
|
if (cached) {
|
|
struct btrfs_free_space_ctl *ctl =
|
|
block_group->free_space_ctl;
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
if (ctl->free_space <
|
|
num_bytes + empty_cluster + empty_size) {
|
|
if (ctl->free_space > max_extent_size)
|
|
max_extent_size = ctl->free_space;
|
|
spin_unlock(&ctl->tree_lock);
|
|
goto loop;
|
|
}
|
|
spin_unlock(&ctl->tree_lock);
|
|
}
|
|
|
|
offset = btrfs_find_space_for_alloc(block_group, search_start,
|
|
num_bytes, empty_size,
|
|
&max_extent_size);
|
|
/*
|
|
* If we didn't find a chunk, and we haven't failed on this
|
|
* block group before, and this block group is in the middle of
|
|
* caching and we are ok with waiting, then go ahead and wait
|
|
* for progress to be made, and set failed_alloc to true.
|
|
*
|
|
* If failed_alloc is true then we've already waited on this
|
|
* block group once and should move on to the next block group.
|
|
*/
|
|
if (!offset && !failed_alloc && !cached &&
|
|
loop > LOOP_CACHING_NOWAIT) {
|
|
wait_block_group_cache_progress(block_group,
|
|
num_bytes + empty_size);
|
|
failed_alloc = true;
|
|
goto have_block_group;
|
|
} else if (!offset) {
|
|
goto loop;
|
|
}
|
|
checks:
|
|
search_start = ALIGN(offset, fs_info->stripesize);
|
|
|
|
/* move on to the next group */
|
|
if (search_start + num_bytes >
|
|
block_group->key.objectid + block_group->key.offset) {
|
|
btrfs_add_free_space(block_group, offset, num_bytes);
|
|
goto loop;
|
|
}
|
|
|
|
if (offset < search_start)
|
|
btrfs_add_free_space(block_group, offset,
|
|
search_start - offset);
|
|
BUG_ON(offset > search_start);
|
|
|
|
ret = btrfs_add_reserved_bytes(block_group, ram_bytes,
|
|
num_bytes, delalloc);
|
|
if (ret == -EAGAIN) {
|
|
btrfs_add_free_space(block_group, offset, num_bytes);
|
|
goto loop;
|
|
}
|
|
btrfs_inc_block_group_reservations(block_group);
|
|
|
|
/* we are all good, lets return */
|
|
ins->objectid = search_start;
|
|
ins->offset = num_bytes;
|
|
|
|
trace_btrfs_reserve_extent(fs_info, block_group,
|
|
search_start, num_bytes);
|
|
btrfs_release_block_group(block_group, delalloc);
|
|
break;
|
|
loop:
|
|
failed_cluster_refill = false;
|
|
failed_alloc = false;
|
|
BUG_ON(index != get_block_group_index(block_group));
|
|
btrfs_release_block_group(block_group, delalloc);
|
|
cond_resched();
|
|
}
|
|
up_read(&space_info->groups_sem);
|
|
|
|
if ((loop == LOOP_CACHING_NOWAIT) && have_caching_bg
|
|
&& !orig_have_caching_bg)
|
|
orig_have_caching_bg = true;
|
|
|
|
if (!ins->objectid && loop >= LOOP_CACHING_WAIT && have_caching_bg)
|
|
goto search;
|
|
|
|
if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES)
|
|
goto search;
|
|
|
|
/*
|
|
* LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
|
|
* caching kthreads as we move along
|
|
* LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
|
|
* LOOP_ALLOC_CHUNK, force a chunk allocation and try again
|
|
* LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
|
|
* again
|
|
*/
|
|
if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) {
|
|
index = 0;
|
|
if (loop == LOOP_CACHING_NOWAIT) {
|
|
/*
|
|
* We want to skip the LOOP_CACHING_WAIT step if we
|
|
* don't have any uncached bgs and we've already done a
|
|
* full search through.
|
|
*/
|
|
if (orig_have_caching_bg || !full_search)
|
|
loop = LOOP_CACHING_WAIT;
|
|
else
|
|
loop = LOOP_ALLOC_CHUNK;
|
|
} else {
|
|
loop++;
|
|
}
|
|
|
|
if (loop == LOOP_ALLOC_CHUNK) {
|
|
struct btrfs_trans_handle *trans;
|
|
int exist = 0;
|
|
|
|
trans = current->journal_info;
|
|
if (trans)
|
|
exist = 1;
|
|
else
|
|
trans = btrfs_join_transaction(root);
|
|
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
|
|
ret = do_chunk_alloc(trans, fs_info, flags,
|
|
CHUNK_ALLOC_FORCE);
|
|
|
|
/*
|
|
* If we can't allocate a new chunk we've already looped
|
|
* through at least once, move on to the NO_EMPTY_SIZE
|
|
* case.
|
|
*/
|
|
if (ret == -ENOSPC)
|
|
loop = LOOP_NO_EMPTY_SIZE;
|
|
|
|
/*
|
|
* Do not bail out on ENOSPC since we
|
|
* can do more things.
|
|
*/
|
|
if (ret < 0 && ret != -ENOSPC)
|
|
btrfs_abort_transaction(trans, ret);
|
|
else
|
|
ret = 0;
|
|
if (!exist)
|
|
btrfs_end_transaction(trans);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (loop == LOOP_NO_EMPTY_SIZE) {
|
|
/*
|
|
* Don't loop again if we already have no empty_size and
|
|
* no empty_cluster.
|
|
*/
|
|
if (empty_size == 0 &&
|
|
empty_cluster == 0) {
|
|
ret = -ENOSPC;
|
|
goto out;
|
|
}
|
|
empty_size = 0;
|
|
empty_cluster = 0;
|
|
}
|
|
|
|
goto search;
|
|
} else if (!ins->objectid) {
|
|
ret = -ENOSPC;
|
|
} else if (ins->objectid) {
|
|
if (!use_cluster && last_ptr) {
|
|
spin_lock(&last_ptr->lock);
|
|
last_ptr->window_start = ins->objectid;
|
|
spin_unlock(&last_ptr->lock);
|
|
}
|
|
ret = 0;
|
|
}
|
|
out:
|
|
if (ret == -ENOSPC) {
|
|
spin_lock(&space_info->lock);
|
|
space_info->max_extent_size = max_extent_size;
|
|
spin_unlock(&space_info->lock);
|
|
ins->offset = max_extent_size;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void dump_space_info(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_space_info *info, u64 bytes,
|
|
int dump_block_groups)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
int index = 0;
|
|
|
|
spin_lock(&info->lock);
|
|
btrfs_info(fs_info, "space_info %llu has %llu free, is %sfull",
|
|
info->flags,
|
|
info->total_bytes - btrfs_space_info_used(info, true),
|
|
info->full ? "" : "not ");
|
|
btrfs_info(fs_info,
|
|
"space_info total=%llu, used=%llu, pinned=%llu, reserved=%llu, may_use=%llu, readonly=%llu",
|
|
info->total_bytes, info->bytes_used, info->bytes_pinned,
|
|
info->bytes_reserved, info->bytes_may_use,
|
|
info->bytes_readonly);
|
|
spin_unlock(&info->lock);
|
|
|
|
if (!dump_block_groups)
|
|
return;
|
|
|
|
down_read(&info->groups_sem);
|
|
again:
|
|
list_for_each_entry(cache, &info->block_groups[index], list) {
|
|
spin_lock(&cache->lock);
|
|
btrfs_info(fs_info,
|
|
"block group %llu has %llu bytes, %llu used %llu pinned %llu reserved %s",
|
|
cache->key.objectid, cache->key.offset,
|
|
btrfs_block_group_used(&cache->item), cache->pinned,
|
|
cache->reserved, cache->ro ? "[readonly]" : "");
|
|
btrfs_dump_free_space(cache, bytes);
|
|
spin_unlock(&cache->lock);
|
|
}
|
|
if (++index < BTRFS_NR_RAID_TYPES)
|
|
goto again;
|
|
up_read(&info->groups_sem);
|
|
}
|
|
|
|
int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes,
|
|
u64 num_bytes, u64 min_alloc_size,
|
|
u64 empty_size, u64 hint_byte,
|
|
struct btrfs_key *ins, int is_data, int delalloc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
bool final_tried = num_bytes == min_alloc_size;
|
|
u64 flags;
|
|
int ret;
|
|
|
|
flags = get_alloc_profile_by_root(root, is_data);
|
|
again:
|
|
WARN_ON(num_bytes < fs_info->sectorsize);
|
|
ret = find_free_extent(fs_info, ram_bytes, num_bytes, empty_size,
|
|
hint_byte, ins, flags, delalloc);
|
|
if (!ret && !is_data) {
|
|
btrfs_dec_block_group_reservations(fs_info, ins->objectid);
|
|
} else if (ret == -ENOSPC) {
|
|
if (!final_tried && ins->offset) {
|
|
num_bytes = min(num_bytes >> 1, ins->offset);
|
|
num_bytes = round_down(num_bytes,
|
|
fs_info->sectorsize);
|
|
num_bytes = max(num_bytes, min_alloc_size);
|
|
ram_bytes = num_bytes;
|
|
if (num_bytes == min_alloc_size)
|
|
final_tried = true;
|
|
goto again;
|
|
} else if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
|
|
struct btrfs_space_info *sinfo;
|
|
|
|
sinfo = __find_space_info(fs_info, flags);
|
|
btrfs_err(fs_info,
|
|
"allocation failed flags %llu, wanted %llu",
|
|
flags, num_bytes);
|
|
if (sinfo)
|
|
dump_space_info(fs_info, sinfo, num_bytes, 1);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 len,
|
|
int pin, int delalloc)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
int ret = 0;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, start);
|
|
if (!cache) {
|
|
btrfs_err(fs_info, "Unable to find block group for %llu",
|
|
start);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
if (pin)
|
|
pin_down_extent(fs_info, cache, start, len, 1);
|
|
else {
|
|
if (btrfs_test_opt(fs_info, DISCARD))
|
|
ret = btrfs_discard_extent(fs_info, start, len, NULL);
|
|
btrfs_add_free_space(cache, start, len);
|
|
btrfs_free_reserved_bytes(cache, len, delalloc);
|
|
trace_btrfs_reserved_extent_free(fs_info, start, len);
|
|
}
|
|
|
|
btrfs_put_block_group(cache);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 len, int delalloc)
|
|
{
|
|
return __btrfs_free_reserved_extent(fs_info, start, len, 0, delalloc);
|
|
}
|
|
|
|
int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 len)
|
|
{
|
|
return __btrfs_free_reserved_extent(fs_info, start, len, 1, 0);
|
|
}
|
|
|
|
static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 parent, u64 root_objectid,
|
|
u64 flags, u64 owner, u64 offset,
|
|
struct btrfs_key *ins, int ref_mod)
|
|
{
|
|
int ret;
|
|
struct btrfs_extent_item *extent_item;
|
|
struct btrfs_extent_inline_ref *iref;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
int type;
|
|
u32 size;
|
|
|
|
if (parent > 0)
|
|
type = BTRFS_SHARED_DATA_REF_KEY;
|
|
else
|
|
type = BTRFS_EXTENT_DATA_REF_KEY;
|
|
|
|
size = sizeof(*extent_item) + btrfs_extent_inline_ref_size(type);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
|
|
ins, size);
|
|
if (ret) {
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
extent_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_item);
|
|
btrfs_set_extent_refs(leaf, extent_item, ref_mod);
|
|
btrfs_set_extent_generation(leaf, extent_item, trans->transid);
|
|
btrfs_set_extent_flags(leaf, extent_item,
|
|
flags | BTRFS_EXTENT_FLAG_DATA);
|
|
|
|
iref = (struct btrfs_extent_inline_ref *)(extent_item + 1);
|
|
btrfs_set_extent_inline_ref_type(leaf, iref, type);
|
|
if (parent > 0) {
|
|
struct btrfs_shared_data_ref *ref;
|
|
ref = (struct btrfs_shared_data_ref *)(iref + 1);
|
|
btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
|
|
btrfs_set_shared_data_ref_count(leaf, ref, ref_mod);
|
|
} else {
|
|
struct btrfs_extent_data_ref *ref;
|
|
ref = (struct btrfs_extent_data_ref *)(&iref->offset);
|
|
btrfs_set_extent_data_ref_root(leaf, ref, root_objectid);
|
|
btrfs_set_extent_data_ref_objectid(leaf, ref, owner);
|
|
btrfs_set_extent_data_ref_offset(leaf, ref, offset);
|
|
btrfs_set_extent_data_ref_count(leaf, ref, ref_mod);
|
|
}
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
btrfs_free_path(path);
|
|
|
|
ret = remove_from_free_space_tree(trans, fs_info, ins->objectid,
|
|
ins->offset);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = update_block_group(trans, fs_info, ins->objectid, ins->offset, 1);
|
|
if (ret) { /* -ENOENT, logic error */
|
|
btrfs_err(fs_info, "update block group failed for %llu %llu",
|
|
ins->objectid, ins->offset);
|
|
BUG();
|
|
}
|
|
trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid, ins->offset);
|
|
return ret;
|
|
}
|
|
|
|
static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 parent, u64 root_objectid,
|
|
u64 flags, struct btrfs_disk_key *key,
|
|
int level, struct btrfs_key *ins)
|
|
{
|
|
int ret;
|
|
struct btrfs_extent_item *extent_item;
|
|
struct btrfs_tree_block_info *block_info;
|
|
struct btrfs_extent_inline_ref *iref;
|
|
struct btrfs_path *path;
|
|
struct extent_buffer *leaf;
|
|
u32 size = sizeof(*extent_item) + sizeof(*iref);
|
|
u64 num_bytes = ins->offset;
|
|
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
|
|
|
|
if (!skinny_metadata)
|
|
size += sizeof(*block_info);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
btrfs_free_and_pin_reserved_extent(fs_info, ins->objectid,
|
|
fs_info->nodesize);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
path->leave_spinning = 1;
|
|
ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
|
|
ins, size);
|
|
if (ret) {
|
|
btrfs_free_path(path);
|
|
btrfs_free_and_pin_reserved_extent(fs_info, ins->objectid,
|
|
fs_info->nodesize);
|
|
return ret;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
extent_item = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_extent_item);
|
|
btrfs_set_extent_refs(leaf, extent_item, 1);
|
|
btrfs_set_extent_generation(leaf, extent_item, trans->transid);
|
|
btrfs_set_extent_flags(leaf, extent_item,
|
|
flags | BTRFS_EXTENT_FLAG_TREE_BLOCK);
|
|
|
|
if (skinny_metadata) {
|
|
iref = (struct btrfs_extent_inline_ref *)(extent_item + 1);
|
|
num_bytes = fs_info->nodesize;
|
|
} else {
|
|
block_info = (struct btrfs_tree_block_info *)(extent_item + 1);
|
|
btrfs_set_tree_block_key(leaf, block_info, key);
|
|
btrfs_set_tree_block_level(leaf, block_info, level);
|
|
iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
|
|
}
|
|
|
|
if (parent > 0) {
|
|
BUG_ON(!(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF));
|
|
btrfs_set_extent_inline_ref_type(leaf, iref,
|
|
BTRFS_SHARED_BLOCK_REF_KEY);
|
|
btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
|
|
} else {
|
|
btrfs_set_extent_inline_ref_type(leaf, iref,
|
|
BTRFS_TREE_BLOCK_REF_KEY);
|
|
btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
|
|
}
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_free_path(path);
|
|
|
|
ret = remove_from_free_space_tree(trans, fs_info, ins->objectid,
|
|
num_bytes);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = update_block_group(trans, fs_info, ins->objectid,
|
|
fs_info->nodesize, 1);
|
|
if (ret) { /* -ENOENT, logic error */
|
|
btrfs_err(fs_info, "update block group failed for %llu %llu",
|
|
ins->objectid, ins->offset);
|
|
BUG();
|
|
}
|
|
|
|
trace_btrfs_reserved_extent_alloc(fs_info, ins->objectid,
|
|
fs_info->nodesize);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 owner,
|
|
u64 offset, u64 ram_bytes,
|
|
struct btrfs_key *ins)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
BUG_ON(root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
btrfs_ref_tree_mod(root, ins->objectid, ins->offset, 0,
|
|
root->root_key.objectid, owner, offset,
|
|
BTRFS_ADD_DELAYED_EXTENT);
|
|
|
|
ret = btrfs_add_delayed_data_ref(fs_info, trans, ins->objectid,
|
|
ins->offset, 0,
|
|
root->root_key.objectid, owner,
|
|
offset, ram_bytes,
|
|
BTRFS_ADD_DELAYED_EXTENT, NULL, NULL);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* this is used by the tree logging recovery code. It records that
|
|
* an extent has been allocated and makes sure to clear the free
|
|
* space cache bits as well
|
|
*/
|
|
int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 root_objectid, u64 owner, u64 offset,
|
|
struct btrfs_key *ins)
|
|
{
|
|
int ret;
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_space_info *space_info;
|
|
|
|
/*
|
|
* Mixed block groups will exclude before processing the log so we only
|
|
* need to do the exclude dance if this fs isn't mixed.
|
|
*/
|
|
if (!btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
|
|
ret = __exclude_logged_extent(fs_info, ins->objectid,
|
|
ins->offset);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
block_group = btrfs_lookup_block_group(fs_info, ins->objectid);
|
|
if (!block_group)
|
|
return -EINVAL;
|
|
|
|
space_info = block_group->space_info;
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&block_group->lock);
|
|
space_info->bytes_reserved += ins->offset;
|
|
block_group->reserved += ins->offset;
|
|
spin_unlock(&block_group->lock);
|
|
spin_unlock(&space_info->lock);
|
|
|
|
ret = alloc_reserved_file_extent(trans, fs_info, 0, root_objectid,
|
|
0, owner, offset, ins, 1);
|
|
btrfs_put_block_group(block_group);
|
|
return ret;
|
|
}
|
|
|
|
static struct extent_buffer *
|
|
btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
u64 bytenr, int level)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct extent_buffer *buf;
|
|
|
|
buf = btrfs_find_create_tree_block(fs_info, bytenr);
|
|
if (IS_ERR(buf))
|
|
return buf;
|
|
|
|
btrfs_set_header_generation(buf, trans->transid);
|
|
btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level);
|
|
btrfs_tree_lock(buf);
|
|
clean_tree_block(fs_info, buf);
|
|
clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);
|
|
|
|
btrfs_set_lock_blocking(buf);
|
|
set_extent_buffer_uptodate(buf);
|
|
|
|
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
|
|
buf->log_index = root->log_transid % 2;
|
|
/*
|
|
* we allow two log transactions at a time, use different
|
|
* EXENT bit to differentiate dirty pages.
|
|
*/
|
|
if (buf->log_index == 0)
|
|
set_extent_dirty(&root->dirty_log_pages, buf->start,
|
|
buf->start + buf->len - 1, GFP_NOFS);
|
|
else
|
|
set_extent_new(&root->dirty_log_pages, buf->start,
|
|
buf->start + buf->len - 1);
|
|
} else {
|
|
buf->log_index = -1;
|
|
set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
|
|
buf->start + buf->len - 1, GFP_NOFS);
|
|
}
|
|
trans->dirty = true;
|
|
/* this returns a buffer locked for blocking */
|
|
return buf;
|
|
}
|
|
|
|
static struct btrfs_block_rsv *
|
|
use_block_rsv(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u32 blocksize)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
|
|
int ret;
|
|
bool global_updated = false;
|
|
|
|
block_rsv = get_block_rsv(trans, root);
|
|
|
|
if (unlikely(block_rsv->size == 0))
|
|
goto try_reserve;
|
|
again:
|
|
ret = block_rsv_use_bytes(block_rsv, blocksize);
|
|
if (!ret)
|
|
return block_rsv;
|
|
|
|
if (block_rsv->failfast)
|
|
return ERR_PTR(ret);
|
|
|
|
if (block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL && !global_updated) {
|
|
global_updated = true;
|
|
update_global_block_rsv(fs_info);
|
|
goto again;
|
|
}
|
|
|
|
if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
|
|
static DEFINE_RATELIMIT_STATE(_rs,
|
|
DEFAULT_RATELIMIT_INTERVAL * 10,
|
|
/*DEFAULT_RATELIMIT_BURST*/ 1);
|
|
if (__ratelimit(&_rs))
|
|
WARN(1, KERN_DEBUG
|
|
"BTRFS: block rsv returned %d\n", ret);
|
|
}
|
|
try_reserve:
|
|
ret = reserve_metadata_bytes(root, block_rsv, blocksize,
|
|
BTRFS_RESERVE_NO_FLUSH);
|
|
if (!ret)
|
|
return block_rsv;
|
|
/*
|
|
* If we couldn't reserve metadata bytes try and use some from
|
|
* the global reserve if its space type is the same as the global
|
|
* reservation.
|
|
*/
|
|
if (block_rsv->type != BTRFS_BLOCK_RSV_GLOBAL &&
|
|
block_rsv->space_info == global_rsv->space_info) {
|
|
ret = block_rsv_use_bytes(global_rsv, blocksize);
|
|
if (!ret)
|
|
return global_rsv;
|
|
}
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void unuse_block_rsv(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv, u32 blocksize)
|
|
{
|
|
block_rsv_add_bytes(block_rsv, blocksize, 0);
|
|
block_rsv_release_bytes(fs_info, block_rsv, NULL, 0);
|
|
}
|
|
|
|
/*
|
|
* finds a free extent and does all the dirty work required for allocation
|
|
* returns the tree buffer or an ERR_PTR on error.
|
|
*/
|
|
struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u64 parent, u64 root_objectid,
|
|
const struct btrfs_disk_key *key,
|
|
int level, u64 hint,
|
|
u64 empty_size)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_key ins;
|
|
struct btrfs_block_rsv *block_rsv;
|
|
struct extent_buffer *buf;
|
|
struct btrfs_delayed_extent_op *extent_op;
|
|
u64 flags = 0;
|
|
int ret;
|
|
u32 blocksize = fs_info->nodesize;
|
|
bool skinny_metadata = btrfs_fs_incompat(fs_info, SKINNY_METADATA);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
if (btrfs_is_testing(fs_info)) {
|
|
buf = btrfs_init_new_buffer(trans, root, root->alloc_bytenr,
|
|
level);
|
|
if (!IS_ERR(buf))
|
|
root->alloc_bytenr += blocksize;
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
block_rsv = use_block_rsv(trans, root, blocksize);
|
|
if (IS_ERR(block_rsv))
|
|
return ERR_CAST(block_rsv);
|
|
|
|
ret = btrfs_reserve_extent(root, blocksize, blocksize, blocksize,
|
|
empty_size, hint, &ins, 0, 0);
|
|
if (ret)
|
|
goto out_unuse;
|
|
|
|
buf = btrfs_init_new_buffer(trans, root, ins.objectid, level);
|
|
if (IS_ERR(buf)) {
|
|
ret = PTR_ERR(buf);
|
|
goto out_free_reserved;
|
|
}
|
|
|
|
if (root_objectid == BTRFS_TREE_RELOC_OBJECTID) {
|
|
if (parent == 0)
|
|
parent = ins.objectid;
|
|
flags |= BTRFS_BLOCK_FLAG_FULL_BACKREF;
|
|
} else
|
|
BUG_ON(parent > 0);
|
|
|
|
if (root_objectid != BTRFS_TREE_LOG_OBJECTID) {
|
|
extent_op = btrfs_alloc_delayed_extent_op();
|
|
if (!extent_op) {
|
|
ret = -ENOMEM;
|
|
goto out_free_buf;
|
|
}
|
|
if (key)
|
|
memcpy(&extent_op->key, key, sizeof(extent_op->key));
|
|
else
|
|
memset(&extent_op->key, 0, sizeof(extent_op->key));
|
|
extent_op->flags_to_set = flags;
|
|
extent_op->update_key = skinny_metadata ? false : true;
|
|
extent_op->update_flags = true;
|
|
extent_op->is_data = false;
|
|
extent_op->level = level;
|
|
|
|
btrfs_ref_tree_mod(root, ins.objectid, ins.offset, parent,
|
|
root_objectid, level, 0,
|
|
BTRFS_ADD_DELAYED_EXTENT);
|
|
ret = btrfs_add_delayed_tree_ref(fs_info, trans, ins.objectid,
|
|
ins.offset, parent,
|
|
root_objectid, level,
|
|
BTRFS_ADD_DELAYED_EXTENT,
|
|
extent_op, NULL, NULL);
|
|
if (ret)
|
|
goto out_free_delayed;
|
|
}
|
|
return buf;
|
|
|
|
out_free_delayed:
|
|
btrfs_free_delayed_extent_op(extent_op);
|
|
out_free_buf:
|
|
free_extent_buffer(buf);
|
|
out_free_reserved:
|
|
btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 0);
|
|
out_unuse:
|
|
unuse_block_rsv(fs_info, block_rsv, blocksize);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
struct walk_control {
|
|
u64 refs[BTRFS_MAX_LEVEL];
|
|
u64 flags[BTRFS_MAX_LEVEL];
|
|
struct btrfs_key update_progress;
|
|
int stage;
|
|
int level;
|
|
int shared_level;
|
|
int update_ref;
|
|
int keep_locks;
|
|
int reada_slot;
|
|
int reada_count;
|
|
int for_reloc;
|
|
};
|
|
|
|
#define DROP_REFERENCE 1
|
|
#define UPDATE_BACKREF 2
|
|
|
|
static noinline void reada_walk_down(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct walk_control *wc,
|
|
struct btrfs_path *path)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 bytenr;
|
|
u64 generation;
|
|
u64 refs;
|
|
u64 flags;
|
|
u32 nritems;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *eb;
|
|
int ret;
|
|
int slot;
|
|
int nread = 0;
|
|
|
|
if (path->slots[wc->level] < wc->reada_slot) {
|
|
wc->reada_count = wc->reada_count * 2 / 3;
|
|
wc->reada_count = max(wc->reada_count, 2);
|
|
} else {
|
|
wc->reada_count = wc->reada_count * 3 / 2;
|
|
wc->reada_count = min_t(int, wc->reada_count,
|
|
BTRFS_NODEPTRS_PER_BLOCK(fs_info));
|
|
}
|
|
|
|
eb = path->nodes[wc->level];
|
|
nritems = btrfs_header_nritems(eb);
|
|
|
|
for (slot = path->slots[wc->level]; slot < nritems; slot++) {
|
|
if (nread >= wc->reada_count)
|
|
break;
|
|
|
|
cond_resched();
|
|
bytenr = btrfs_node_blockptr(eb, slot);
|
|
generation = btrfs_node_ptr_generation(eb, slot);
|
|
|
|
if (slot == path->slots[wc->level])
|
|
goto reada;
|
|
|
|
if (wc->stage == UPDATE_BACKREF &&
|
|
generation <= root->root_key.offset)
|
|
continue;
|
|
|
|
/* We don't lock the tree block, it's OK to be racy here */
|
|
ret = btrfs_lookup_extent_info(trans, fs_info, bytenr,
|
|
wc->level - 1, 1, &refs,
|
|
&flags);
|
|
/* We don't care about errors in readahead. */
|
|
if (ret < 0)
|
|
continue;
|
|
BUG_ON(refs == 0);
|
|
|
|
if (wc->stage == DROP_REFERENCE) {
|
|
if (refs == 1)
|
|
goto reada;
|
|
|
|
if (wc->level == 1 &&
|
|
(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF))
|
|
continue;
|
|
if (!wc->update_ref ||
|
|
generation <= root->root_key.offset)
|
|
continue;
|
|
btrfs_node_key_to_cpu(eb, &key, slot);
|
|
ret = btrfs_comp_cpu_keys(&key,
|
|
&wc->update_progress);
|
|
if (ret < 0)
|
|
continue;
|
|
} else {
|
|
if (wc->level == 1 &&
|
|
(flags & BTRFS_BLOCK_FLAG_FULL_BACKREF))
|
|
continue;
|
|
}
|
|
reada:
|
|
readahead_tree_block(fs_info, bytenr);
|
|
nread++;
|
|
}
|
|
wc->reada_slot = slot;
|
|
}
|
|
|
|
/*
|
|
* helper to process tree block while walking down the tree.
|
|
*
|
|
* when wc->stage == UPDATE_BACKREF, this function updates
|
|
* back refs for pointers in the block.
|
|
*
|
|
* NOTE: return value 1 means we should stop walking down.
|
|
*/
|
|
static noinline int walk_down_proc(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct walk_control *wc, int lookup_info)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int level = wc->level;
|
|
struct extent_buffer *eb = path->nodes[level];
|
|
u64 flag = BTRFS_BLOCK_FLAG_FULL_BACKREF;
|
|
int ret;
|
|
|
|
if (wc->stage == UPDATE_BACKREF &&
|
|
btrfs_header_owner(eb) != root->root_key.objectid)
|
|
return 1;
|
|
|
|
/*
|
|
* when reference count of tree block is 1, it won't increase
|
|
* again. once full backref flag is set, we never clear it.
|
|
*/
|
|
if (lookup_info &&
|
|
((wc->stage == DROP_REFERENCE && wc->refs[level] != 1) ||
|
|
(wc->stage == UPDATE_BACKREF && !(wc->flags[level] & flag)))) {
|
|
BUG_ON(!path->locks[level]);
|
|
ret = btrfs_lookup_extent_info(trans, fs_info,
|
|
eb->start, level, 1,
|
|
&wc->refs[level],
|
|
&wc->flags[level]);
|
|
BUG_ON(ret == -ENOMEM);
|
|
if (ret)
|
|
return ret;
|
|
BUG_ON(wc->refs[level] == 0);
|
|
}
|
|
|
|
if (wc->stage == DROP_REFERENCE) {
|
|
if (wc->refs[level] > 1)
|
|
return 1;
|
|
|
|
if (path->locks[level] && !wc->keep_locks) {
|
|
btrfs_tree_unlock_rw(eb, path->locks[level]);
|
|
path->locks[level] = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* wc->stage == UPDATE_BACKREF */
|
|
if (!(wc->flags[level] & flag)) {
|
|
BUG_ON(!path->locks[level]);
|
|
ret = btrfs_inc_ref(trans, root, eb, 1);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
ret = btrfs_dec_ref(trans, root, eb, 0);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
ret = btrfs_set_disk_extent_flags(trans, fs_info, eb->start,
|
|
eb->len, flag,
|
|
btrfs_header_level(eb), 0);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
wc->flags[level] |= flag;
|
|
}
|
|
|
|
/*
|
|
* the block is shared by multiple trees, so it's not good to
|
|
* keep the tree lock
|
|
*/
|
|
if (path->locks[level] && level > 0) {
|
|
btrfs_tree_unlock_rw(eb, path->locks[level]);
|
|
path->locks[level] = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* helper to process tree block pointer.
|
|
*
|
|
* when wc->stage == DROP_REFERENCE, this function checks
|
|
* reference count of the block pointed to. if the block
|
|
* is shared and we need update back refs for the subtree
|
|
* rooted at the block, this function changes wc->stage to
|
|
* UPDATE_BACKREF. if the block is shared and there is no
|
|
* need to update back, this function drops the reference
|
|
* to the block.
|
|
*
|
|
* NOTE: return value 1 means we should stop walking down.
|
|
*/
|
|
static noinline int do_walk_down(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct walk_control *wc, int *lookup_info)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 bytenr;
|
|
u64 generation;
|
|
u64 parent;
|
|
u32 blocksize;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *next;
|
|
int level = wc->level;
|
|
int reada = 0;
|
|
int ret = 0;
|
|
bool need_account = false;
|
|
|
|
generation = btrfs_node_ptr_generation(path->nodes[level],
|
|
path->slots[level]);
|
|
/*
|
|
* if the lower level block was created before the snapshot
|
|
* was created, we know there is no need to update back refs
|
|
* for the subtree
|
|
*/
|
|
if (wc->stage == UPDATE_BACKREF &&
|
|
generation <= root->root_key.offset) {
|
|
*lookup_info = 1;
|
|
return 1;
|
|
}
|
|
|
|
bytenr = btrfs_node_blockptr(path->nodes[level], path->slots[level]);
|
|
blocksize = fs_info->nodesize;
|
|
|
|
next = find_extent_buffer(fs_info, bytenr);
|
|
if (!next) {
|
|
next = btrfs_find_create_tree_block(fs_info, bytenr);
|
|
if (IS_ERR(next))
|
|
return PTR_ERR(next);
|
|
|
|
btrfs_set_buffer_lockdep_class(root->root_key.objectid, next,
|
|
level - 1);
|
|
reada = 1;
|
|
}
|
|
btrfs_tree_lock(next);
|
|
btrfs_set_lock_blocking(next);
|
|
|
|
ret = btrfs_lookup_extent_info(trans, fs_info, bytenr, level - 1, 1,
|
|
&wc->refs[level - 1],
|
|
&wc->flags[level - 1]);
|
|
if (ret < 0)
|
|
goto out_unlock;
|
|
|
|
if (unlikely(wc->refs[level - 1] == 0)) {
|
|
btrfs_err(fs_info, "Missing references.");
|
|
ret = -EIO;
|
|
goto out_unlock;
|
|
}
|
|
*lookup_info = 0;
|
|
|
|
if (wc->stage == DROP_REFERENCE) {
|
|
if (wc->refs[level - 1] > 1) {
|
|
need_account = true;
|
|
if (level == 1 &&
|
|
(wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF))
|
|
goto skip;
|
|
|
|
if (!wc->update_ref ||
|
|
generation <= root->root_key.offset)
|
|
goto skip;
|
|
|
|
btrfs_node_key_to_cpu(path->nodes[level], &key,
|
|
path->slots[level]);
|
|
ret = btrfs_comp_cpu_keys(&key, &wc->update_progress);
|
|
if (ret < 0)
|
|
goto skip;
|
|
|
|
wc->stage = UPDATE_BACKREF;
|
|
wc->shared_level = level - 1;
|
|
}
|
|
} else {
|
|
if (level == 1 &&
|
|
(wc->flags[0] & BTRFS_BLOCK_FLAG_FULL_BACKREF))
|
|
goto skip;
|
|
}
|
|
|
|
if (!btrfs_buffer_uptodate(next, generation, 0)) {
|
|
btrfs_tree_unlock(next);
|
|
free_extent_buffer(next);
|
|
next = NULL;
|
|
*lookup_info = 1;
|
|
}
|
|
|
|
if (!next) {
|
|
if (reada && level == 1)
|
|
reada_walk_down(trans, root, wc, path);
|
|
next = read_tree_block(fs_info, bytenr, generation);
|
|
if (IS_ERR(next)) {
|
|
return PTR_ERR(next);
|
|
} else if (!extent_buffer_uptodate(next)) {
|
|
free_extent_buffer(next);
|
|
return -EIO;
|
|
}
|
|
btrfs_tree_lock(next);
|
|
btrfs_set_lock_blocking(next);
|
|
}
|
|
|
|
level--;
|
|
ASSERT(level == btrfs_header_level(next));
|
|
if (level != btrfs_header_level(next)) {
|
|
btrfs_err(root->fs_info, "mismatched level");
|
|
ret = -EIO;
|
|
goto out_unlock;
|
|
}
|
|
path->nodes[level] = next;
|
|
path->slots[level] = 0;
|
|
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
|
|
wc->level = level;
|
|
if (wc->level == 1)
|
|
wc->reada_slot = 0;
|
|
return 0;
|
|
skip:
|
|
wc->refs[level - 1] = 0;
|
|
wc->flags[level - 1] = 0;
|
|
if (wc->stage == DROP_REFERENCE) {
|
|
if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF) {
|
|
parent = path->nodes[level]->start;
|
|
} else {
|
|
ASSERT(root->root_key.objectid ==
|
|
btrfs_header_owner(path->nodes[level]));
|
|
if (root->root_key.objectid !=
|
|
btrfs_header_owner(path->nodes[level])) {
|
|
btrfs_err(root->fs_info,
|
|
"mismatched block owner");
|
|
ret = -EIO;
|
|
goto out_unlock;
|
|
}
|
|
parent = 0;
|
|
}
|
|
|
|
if (need_account) {
|
|
ret = btrfs_qgroup_trace_subtree(trans, root, next,
|
|
generation, level - 1);
|
|
if (ret) {
|
|
btrfs_err_rl(fs_info,
|
|
"Error %d accounting shared subtree. Quota is out of sync, rescan required.",
|
|
ret);
|
|
}
|
|
}
|
|
ret = btrfs_free_extent(trans, root, bytenr, blocksize,
|
|
parent, root->root_key.objectid,
|
|
level - 1, 0);
|
|
if (ret)
|
|
goto out_unlock;
|
|
}
|
|
|
|
*lookup_info = 1;
|
|
ret = 1;
|
|
|
|
out_unlock:
|
|
btrfs_tree_unlock(next);
|
|
free_extent_buffer(next);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper to process tree block while walking up the tree.
|
|
*
|
|
* when wc->stage == DROP_REFERENCE, this function drops
|
|
* reference count on the block.
|
|
*
|
|
* when wc->stage == UPDATE_BACKREF, this function changes
|
|
* wc->stage back to DROP_REFERENCE if we changed wc->stage
|
|
* to UPDATE_BACKREF previously while processing the block.
|
|
*
|
|
* NOTE: return value 1 means we should stop walking up.
|
|
*/
|
|
static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct walk_control *wc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
int level = wc->level;
|
|
struct extent_buffer *eb = path->nodes[level];
|
|
u64 parent = 0;
|
|
|
|
if (wc->stage == UPDATE_BACKREF) {
|
|
BUG_ON(wc->shared_level < level);
|
|
if (level < wc->shared_level)
|
|
goto out;
|
|
|
|
ret = find_next_key(path, level + 1, &wc->update_progress);
|
|
if (ret > 0)
|
|
wc->update_ref = 0;
|
|
|
|
wc->stage = DROP_REFERENCE;
|
|
wc->shared_level = -1;
|
|
path->slots[level] = 0;
|
|
|
|
/*
|
|
* check reference count again if the block isn't locked.
|
|
* we should start walking down the tree again if reference
|
|
* count is one.
|
|
*/
|
|
if (!path->locks[level]) {
|
|
BUG_ON(level == 0);
|
|
btrfs_tree_lock(eb);
|
|
btrfs_set_lock_blocking(eb);
|
|
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
|
|
|
|
ret = btrfs_lookup_extent_info(trans, fs_info,
|
|
eb->start, level, 1,
|
|
&wc->refs[level],
|
|
&wc->flags[level]);
|
|
if (ret < 0) {
|
|
btrfs_tree_unlock_rw(eb, path->locks[level]);
|
|
path->locks[level] = 0;
|
|
return ret;
|
|
}
|
|
BUG_ON(wc->refs[level] == 0);
|
|
if (wc->refs[level] == 1) {
|
|
btrfs_tree_unlock_rw(eb, path->locks[level]);
|
|
path->locks[level] = 0;
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* wc->stage == DROP_REFERENCE */
|
|
BUG_ON(wc->refs[level] > 1 && !path->locks[level]);
|
|
|
|
if (wc->refs[level] == 1) {
|
|
if (level == 0) {
|
|
if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
|
|
ret = btrfs_dec_ref(trans, root, eb, 1);
|
|
else
|
|
ret = btrfs_dec_ref(trans, root, eb, 0);
|
|
BUG_ON(ret); /* -ENOMEM */
|
|
ret = btrfs_qgroup_trace_leaf_items(trans, fs_info, eb);
|
|
if (ret) {
|
|
btrfs_err_rl(fs_info,
|
|
"error %d accounting leaf items. Quota is out of sync, rescan required.",
|
|
ret);
|
|
}
|
|
}
|
|
/* make block locked assertion in clean_tree_block happy */
|
|
if (!path->locks[level] &&
|
|
btrfs_header_generation(eb) == trans->transid) {
|
|
btrfs_tree_lock(eb);
|
|
btrfs_set_lock_blocking(eb);
|
|
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
|
|
}
|
|
clean_tree_block(fs_info, eb);
|
|
}
|
|
|
|
if (eb == root->node) {
|
|
if (wc->flags[level] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
|
|
parent = eb->start;
|
|
else
|
|
BUG_ON(root->root_key.objectid !=
|
|
btrfs_header_owner(eb));
|
|
} else {
|
|
if (wc->flags[level + 1] & BTRFS_BLOCK_FLAG_FULL_BACKREF)
|
|
parent = path->nodes[level + 1]->start;
|
|
else
|
|
BUG_ON(root->root_key.objectid !=
|
|
btrfs_header_owner(path->nodes[level + 1]));
|
|
}
|
|
|
|
btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1);
|
|
out:
|
|
wc->refs[level] = 0;
|
|
wc->flags[level] = 0;
|
|
return 0;
|
|
}
|
|
|
|
static noinline int walk_down_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct walk_control *wc)
|
|
{
|
|
int level = wc->level;
|
|
int lookup_info = 1;
|
|
int ret;
|
|
|
|
while (level >= 0) {
|
|
ret = walk_down_proc(trans, root, path, wc, lookup_info);
|
|
if (ret > 0)
|
|
break;
|
|
|
|
if (level == 0)
|
|
break;
|
|
|
|
if (path->slots[level] >=
|
|
btrfs_header_nritems(path->nodes[level]))
|
|
break;
|
|
|
|
ret = do_walk_down(trans, root, path, wc, &lookup_info);
|
|
if (ret > 0) {
|
|
path->slots[level]++;
|
|
continue;
|
|
} else if (ret < 0)
|
|
return ret;
|
|
level = wc->level;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static noinline int walk_up_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct btrfs_path *path,
|
|
struct walk_control *wc, int max_level)
|
|
{
|
|
int level = wc->level;
|
|
int ret;
|
|
|
|
path->slots[level] = btrfs_header_nritems(path->nodes[level]);
|
|
while (level < max_level && path->nodes[level]) {
|
|
wc->level = level;
|
|
if (path->slots[level] + 1 <
|
|
btrfs_header_nritems(path->nodes[level])) {
|
|
path->slots[level]++;
|
|
return 0;
|
|
} else {
|
|
ret = walk_up_proc(trans, root, path, wc);
|
|
if (ret > 0)
|
|
return 0;
|
|
|
|
if (path->locks[level]) {
|
|
btrfs_tree_unlock_rw(path->nodes[level],
|
|
path->locks[level]);
|
|
path->locks[level] = 0;
|
|
}
|
|
free_extent_buffer(path->nodes[level]);
|
|
path->nodes[level] = NULL;
|
|
level++;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* drop a subvolume tree.
|
|
*
|
|
* this function traverses the tree freeing any blocks that only
|
|
* referenced by the tree.
|
|
*
|
|
* when a shared tree block is found. this function decreases its
|
|
* reference count by one. if update_ref is true, this function
|
|
* also make sure backrefs for the shared block and all lower level
|
|
* blocks are properly updated.
|
|
*
|
|
* If called with for_reloc == 0, may exit early with -EAGAIN
|
|
*/
|
|
int btrfs_drop_snapshot(struct btrfs_root *root,
|
|
struct btrfs_block_rsv *block_rsv, int update_ref,
|
|
int for_reloc)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root_item *root_item = &root->root_item;
|
|
struct walk_control *wc;
|
|
struct btrfs_key key;
|
|
int err = 0;
|
|
int ret;
|
|
int level;
|
|
bool root_dropped = false;
|
|
|
|
btrfs_debug(fs_info, "Drop subvolume %llu", root->objectid);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
wc = kzalloc(sizeof(*wc), GFP_NOFS);
|
|
if (!wc) {
|
|
btrfs_free_path(path);
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
trans = btrfs_start_transaction(tree_root, 0);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
goto out_free;
|
|
}
|
|
|
|
if (block_rsv)
|
|
trans->block_rsv = block_rsv;
|
|
|
|
if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
|
|
level = btrfs_header_level(root->node);
|
|
path->nodes[level] = btrfs_lock_root_node(root);
|
|
btrfs_set_lock_blocking(path->nodes[level]);
|
|
path->slots[level] = 0;
|
|
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
|
|
memset(&wc->update_progress, 0,
|
|
sizeof(wc->update_progress));
|
|
} else {
|
|
btrfs_disk_key_to_cpu(&key, &root_item->drop_progress);
|
|
memcpy(&wc->update_progress, &key,
|
|
sizeof(wc->update_progress));
|
|
|
|
level = root_item->drop_level;
|
|
BUG_ON(level == 0);
|
|
path->lowest_level = level;
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
path->lowest_level = 0;
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out_end_trans;
|
|
}
|
|
WARN_ON(ret > 0);
|
|
|
|
/*
|
|
* unlock our path, this is safe because only this
|
|
* function is allowed to delete this snapshot
|
|
*/
|
|
btrfs_unlock_up_safe(path, 0);
|
|
|
|
level = btrfs_header_level(root->node);
|
|
while (1) {
|
|
btrfs_tree_lock(path->nodes[level]);
|
|
btrfs_set_lock_blocking(path->nodes[level]);
|
|
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
|
|
|
|
ret = btrfs_lookup_extent_info(trans, fs_info,
|
|
path->nodes[level]->start,
|
|
level, 1, &wc->refs[level],
|
|
&wc->flags[level]);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto out_end_trans;
|
|
}
|
|
BUG_ON(wc->refs[level] == 0);
|
|
|
|
if (level == root_item->drop_level)
|
|
break;
|
|
|
|
btrfs_tree_unlock(path->nodes[level]);
|
|
path->locks[level] = 0;
|
|
WARN_ON(wc->refs[level] != 1);
|
|
level--;
|
|
}
|
|
}
|
|
|
|
wc->level = level;
|
|
wc->shared_level = -1;
|
|
wc->stage = DROP_REFERENCE;
|
|
wc->update_ref = update_ref;
|
|
wc->keep_locks = 0;
|
|
wc->for_reloc = for_reloc;
|
|
wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info);
|
|
|
|
while (1) {
|
|
|
|
ret = walk_down_tree(trans, root, path, wc);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
break;
|
|
}
|
|
|
|
ret = walk_up_tree(trans, root, path, wc, BTRFS_MAX_LEVEL);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
break;
|
|
}
|
|
|
|
if (ret > 0) {
|
|
BUG_ON(wc->stage != DROP_REFERENCE);
|
|
break;
|
|
}
|
|
|
|
if (wc->stage == DROP_REFERENCE) {
|
|
level = wc->level;
|
|
btrfs_node_key(path->nodes[level],
|
|
&root_item->drop_progress,
|
|
path->slots[level]);
|
|
root_item->drop_level = level;
|
|
}
|
|
|
|
BUG_ON(wc->level == 0);
|
|
if (btrfs_should_end_transaction(trans) ||
|
|
(!for_reloc && btrfs_need_cleaner_sleep(fs_info))) {
|
|
ret = btrfs_update_root(trans, tree_root,
|
|
&root->root_key,
|
|
root_item);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
err = ret;
|
|
goto out_end_trans;
|
|
}
|
|
|
|
btrfs_end_transaction_throttle(trans);
|
|
if (!for_reloc && btrfs_need_cleaner_sleep(fs_info)) {
|
|
btrfs_debug(fs_info,
|
|
"drop snapshot early exit");
|
|
err = -EAGAIN;
|
|
goto out_free;
|
|
}
|
|
|
|
trans = btrfs_start_transaction(tree_root, 0);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
goto out_free;
|
|
}
|
|
if (block_rsv)
|
|
trans->block_rsv = block_rsv;
|
|
}
|
|
}
|
|
btrfs_release_path(path);
|
|
if (err)
|
|
goto out_end_trans;
|
|
|
|
ret = btrfs_del_root(trans, fs_info, &root->root_key);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
err = ret;
|
|
goto out_end_trans;
|
|
}
|
|
|
|
if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
|
|
ret = btrfs_find_root(tree_root, &root->root_key, path,
|
|
NULL, NULL);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
err = ret;
|
|
goto out_end_trans;
|
|
} else if (ret > 0) {
|
|
/* if we fail to delete the orphan item this time
|
|
* around, it'll get picked up the next time.
|
|
*
|
|
* The most common failure here is just -ENOENT.
|
|
*/
|
|
btrfs_del_orphan_item(trans, tree_root,
|
|
root->root_key.objectid);
|
|
}
|
|
}
|
|
|
|
if (test_bit(BTRFS_ROOT_IN_RADIX, &root->state)) {
|
|
btrfs_add_dropped_root(trans, root);
|
|
} else {
|
|
free_extent_buffer(root->node);
|
|
free_extent_buffer(root->commit_root);
|
|
btrfs_put_fs_root(root);
|
|
}
|
|
root_dropped = true;
|
|
out_end_trans:
|
|
btrfs_end_transaction_throttle(trans);
|
|
out_free:
|
|
kfree(wc);
|
|
btrfs_free_path(path);
|
|
out:
|
|
/*
|
|
* So if we need to stop dropping the snapshot for whatever reason we
|
|
* need to make sure to add it back to the dead root list so that we
|
|
* keep trying to do the work later. This also cleans up roots if we
|
|
* don't have it in the radix (like when we recover after a power fail
|
|
* or unmount) so we don't leak memory.
|
|
*/
|
|
if (!for_reloc && !root_dropped)
|
|
btrfs_add_dead_root(root);
|
|
if (err && err != -EAGAIN)
|
|
btrfs_handle_fs_error(fs_info, err, NULL);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* drop subtree rooted at tree block 'node'.
|
|
*
|
|
* NOTE: this function will unlock and release tree block 'node'
|
|
* only used by relocation code
|
|
*/
|
|
int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct extent_buffer *node,
|
|
struct extent_buffer *parent)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_path *path;
|
|
struct walk_control *wc;
|
|
int level;
|
|
int parent_level;
|
|
int ret = 0;
|
|
int wret;
|
|
|
|
BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
wc = kzalloc(sizeof(*wc), GFP_NOFS);
|
|
if (!wc) {
|
|
btrfs_free_path(path);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
btrfs_assert_tree_locked(parent);
|
|
parent_level = btrfs_header_level(parent);
|
|
extent_buffer_get(parent);
|
|
path->nodes[parent_level] = parent;
|
|
path->slots[parent_level] = btrfs_header_nritems(parent);
|
|
|
|
btrfs_assert_tree_locked(node);
|
|
level = btrfs_header_level(node);
|
|
path->nodes[level] = node;
|
|
path->slots[level] = 0;
|
|
path->locks[level] = BTRFS_WRITE_LOCK_BLOCKING;
|
|
|
|
wc->refs[parent_level] = 1;
|
|
wc->flags[parent_level] = BTRFS_BLOCK_FLAG_FULL_BACKREF;
|
|
wc->level = level;
|
|
wc->shared_level = -1;
|
|
wc->stage = DROP_REFERENCE;
|
|
wc->update_ref = 0;
|
|
wc->keep_locks = 1;
|
|
wc->for_reloc = 1;
|
|
wc->reada_count = BTRFS_NODEPTRS_PER_BLOCK(fs_info);
|
|
|
|
while (1) {
|
|
wret = walk_down_tree(trans, root, path, wc);
|
|
if (wret < 0) {
|
|
ret = wret;
|
|
break;
|
|
}
|
|
|
|
wret = walk_up_tree(trans, root, path, wc, parent_level);
|
|
if (wret < 0)
|
|
ret = wret;
|
|
if (wret != 0)
|
|
break;
|
|
}
|
|
|
|
kfree(wc);
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static u64 update_block_group_flags(struct btrfs_fs_info *fs_info, u64 flags)
|
|
{
|
|
u64 num_devices;
|
|
u64 stripped;
|
|
|
|
/*
|
|
* if restripe for this chunk_type is on pick target profile and
|
|
* return, otherwise do the usual balance
|
|
*/
|
|
stripped = get_restripe_target(fs_info, flags);
|
|
if (stripped)
|
|
return extended_to_chunk(stripped);
|
|
|
|
num_devices = fs_info->fs_devices->rw_devices;
|
|
|
|
stripped = BTRFS_BLOCK_GROUP_RAID0 |
|
|
BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
|
|
BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10;
|
|
|
|
if (num_devices == 1) {
|
|
stripped |= BTRFS_BLOCK_GROUP_DUP;
|
|
stripped = flags & ~stripped;
|
|
|
|
/* turn raid0 into single device chunks */
|
|
if (flags & BTRFS_BLOCK_GROUP_RAID0)
|
|
return stripped;
|
|
|
|
/* turn mirroring into duplication */
|
|
if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID10))
|
|
return stripped | BTRFS_BLOCK_GROUP_DUP;
|
|
} else {
|
|
/* they already had raid on here, just return */
|
|
if (flags & stripped)
|
|
return flags;
|
|
|
|
stripped |= BTRFS_BLOCK_GROUP_DUP;
|
|
stripped = flags & ~stripped;
|
|
|
|
/* switch duplicated blocks with raid1 */
|
|
if (flags & BTRFS_BLOCK_GROUP_DUP)
|
|
return stripped | BTRFS_BLOCK_GROUP_RAID1;
|
|
|
|
/* this is drive concat, leave it alone */
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force)
|
|
{
|
|
struct btrfs_space_info *sinfo = cache->space_info;
|
|
u64 num_bytes;
|
|
u64 min_allocable_bytes;
|
|
int ret = -ENOSPC;
|
|
|
|
/*
|
|
* We need some metadata space and system metadata space for
|
|
* allocating chunks in some corner cases until we force to set
|
|
* it to be readonly.
|
|
*/
|
|
if ((sinfo->flags &
|
|
(BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) &&
|
|
!force)
|
|
min_allocable_bytes = SZ_1M;
|
|
else
|
|
min_allocable_bytes = 0;
|
|
|
|
spin_lock(&sinfo->lock);
|
|
spin_lock(&cache->lock);
|
|
|
|
if (cache->ro) {
|
|
cache->ro++;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
num_bytes = cache->key.offset - cache->reserved - cache->pinned -
|
|
cache->bytes_super - btrfs_block_group_used(&cache->item);
|
|
|
|
if (btrfs_space_info_used(sinfo, true) + num_bytes +
|
|
min_allocable_bytes <= sinfo->total_bytes) {
|
|
sinfo->bytes_readonly += num_bytes;
|
|
cache->ro++;
|
|
list_add_tail(&cache->ro_list, &sinfo->ro_bgs);
|
|
ret = 0;
|
|
}
|
|
out:
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&sinfo->lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_inc_block_group_ro(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_group_cache *cache)
|
|
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
u64 alloc_flags;
|
|
int ret;
|
|
|
|
again:
|
|
trans = btrfs_join_transaction(fs_info->extent_root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
/*
|
|
* we're not allowed to set block groups readonly after the dirty
|
|
* block groups cache has started writing. If it already started,
|
|
* back off and let this transaction commit
|
|
*/
|
|
mutex_lock(&fs_info->ro_block_group_mutex);
|
|
if (test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &trans->transaction->flags)) {
|
|
u64 transid = trans->transid;
|
|
|
|
mutex_unlock(&fs_info->ro_block_group_mutex);
|
|
btrfs_end_transaction(trans);
|
|
|
|
ret = btrfs_wait_for_commit(fs_info, transid);
|
|
if (ret)
|
|
return ret;
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* if we are changing raid levels, try to allocate a corresponding
|
|
* block group with the new raid level.
|
|
*/
|
|
alloc_flags = update_block_group_flags(fs_info, cache->flags);
|
|
if (alloc_flags != cache->flags) {
|
|
ret = do_chunk_alloc(trans, fs_info, alloc_flags,
|
|
CHUNK_ALLOC_FORCE);
|
|
/*
|
|
* ENOSPC is allowed here, we may have enough space
|
|
* already allocated at the new raid level to
|
|
* carry on
|
|
*/
|
|
if (ret == -ENOSPC)
|
|
ret = 0;
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
ret = inc_block_group_ro(cache, 0);
|
|
if (!ret)
|
|
goto out;
|
|
alloc_flags = get_alloc_profile(fs_info, cache->space_info->flags);
|
|
ret = do_chunk_alloc(trans, fs_info, alloc_flags,
|
|
CHUNK_ALLOC_FORCE);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = inc_block_group_ro(cache, 0);
|
|
out:
|
|
if (cache->flags & BTRFS_BLOCK_GROUP_SYSTEM) {
|
|
alloc_flags = update_block_group_flags(fs_info, cache->flags);
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
check_system_chunk(trans, fs_info, alloc_flags);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
}
|
|
mutex_unlock(&fs_info->ro_block_group_mutex);
|
|
|
|
btrfs_end_transaction(trans);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 type)
|
|
{
|
|
u64 alloc_flags = get_alloc_profile(fs_info, type);
|
|
|
|
return do_chunk_alloc(trans, fs_info, alloc_flags, CHUNK_ALLOC_FORCE);
|
|
}
|
|
|
|
/*
|
|
* helper to account the unused space of all the readonly block group in the
|
|
* space_info. takes mirrors into account.
|
|
*/
|
|
u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo)
|
|
{
|
|
struct btrfs_block_group_cache *block_group;
|
|
u64 free_bytes = 0;
|
|
int factor;
|
|
|
|
/* It's df, we don't care if it's racy */
|
|
if (list_empty(&sinfo->ro_bgs))
|
|
return 0;
|
|
|
|
spin_lock(&sinfo->lock);
|
|
list_for_each_entry(block_group, &sinfo->ro_bgs, ro_list) {
|
|
spin_lock(&block_group->lock);
|
|
|
|
if (!block_group->ro) {
|
|
spin_unlock(&block_group->lock);
|
|
continue;
|
|
}
|
|
|
|
if (block_group->flags & (BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID10 |
|
|
BTRFS_BLOCK_GROUP_DUP))
|
|
factor = 2;
|
|
else
|
|
factor = 1;
|
|
|
|
free_bytes += (block_group->key.offset -
|
|
btrfs_block_group_used(&block_group->item)) *
|
|
factor;
|
|
|
|
spin_unlock(&block_group->lock);
|
|
}
|
|
spin_unlock(&sinfo->lock);
|
|
|
|
return free_bytes;
|
|
}
|
|
|
|
void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache)
|
|
{
|
|
struct btrfs_space_info *sinfo = cache->space_info;
|
|
u64 num_bytes;
|
|
|
|
BUG_ON(!cache->ro);
|
|
|
|
spin_lock(&sinfo->lock);
|
|
spin_lock(&cache->lock);
|
|
if (!--cache->ro) {
|
|
num_bytes = cache->key.offset - cache->reserved -
|
|
cache->pinned - cache->bytes_super -
|
|
btrfs_block_group_used(&cache->item);
|
|
sinfo->bytes_readonly -= num_bytes;
|
|
list_del_init(&cache->ro_list);
|
|
}
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&sinfo->lock);
|
|
}
|
|
|
|
/*
|
|
* checks to see if its even possible to relocate this block group.
|
|
*
|
|
* @return - -1 if it's not a good idea to relocate this block group, 0 if its
|
|
* ok to go ahead and try.
|
|
*/
|
|
int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
|
|
struct btrfs_device *device;
|
|
struct btrfs_trans_handle *trans;
|
|
u64 min_free;
|
|
u64 dev_min = 1;
|
|
u64 dev_nr = 0;
|
|
u64 target;
|
|
int debug;
|
|
int index;
|
|
int full = 0;
|
|
int ret = 0;
|
|
|
|
debug = btrfs_test_opt(fs_info, ENOSPC_DEBUG);
|
|
|
|
block_group = btrfs_lookup_block_group(fs_info, bytenr);
|
|
|
|
/* odd, couldn't find the block group, leave it alone */
|
|
if (!block_group) {
|
|
if (debug)
|
|
btrfs_warn(fs_info,
|
|
"can't find block group for bytenr %llu",
|
|
bytenr);
|
|
return -1;
|
|
}
|
|
|
|
min_free = btrfs_block_group_used(&block_group->item);
|
|
|
|
/* no bytes used, we're good */
|
|
if (!min_free)
|
|
goto out;
|
|
|
|
space_info = block_group->space_info;
|
|
spin_lock(&space_info->lock);
|
|
|
|
full = space_info->full;
|
|
|
|
/*
|
|
* if this is the last block group we have in this space, we can't
|
|
* relocate it unless we're able to allocate a new chunk below.
|
|
*
|
|
* Otherwise, we need to make sure we have room in the space to handle
|
|
* all of the extents from this block group. If we can, we're good
|
|
*/
|
|
if ((space_info->total_bytes != block_group->key.offset) &&
|
|
(btrfs_space_info_used(space_info, false) + min_free <
|
|
space_info->total_bytes)) {
|
|
spin_unlock(&space_info->lock);
|
|
goto out;
|
|
}
|
|
spin_unlock(&space_info->lock);
|
|
|
|
/*
|
|
* ok we don't have enough space, but maybe we have free space on our
|
|
* devices to allocate new chunks for relocation, so loop through our
|
|
* alloc devices and guess if we have enough space. if this block
|
|
* group is going to be restriped, run checks against the target
|
|
* profile instead of the current one.
|
|
*/
|
|
ret = -1;
|
|
|
|
/*
|
|
* index:
|
|
* 0: raid10
|
|
* 1: raid1
|
|
* 2: dup
|
|
* 3: raid0
|
|
* 4: single
|
|
*/
|
|
target = get_restripe_target(fs_info, block_group->flags);
|
|
if (target) {
|
|
index = __get_raid_index(extended_to_chunk(target));
|
|
} else {
|
|
/*
|
|
* this is just a balance, so if we were marked as full
|
|
* we know there is no space for a new chunk
|
|
*/
|
|
if (full) {
|
|
if (debug)
|
|
btrfs_warn(fs_info,
|
|
"no space to alloc new chunk for block group %llu",
|
|
block_group->key.objectid);
|
|
goto out;
|
|
}
|
|
|
|
index = get_block_group_index(block_group);
|
|
}
|
|
|
|
if (index == BTRFS_RAID_RAID10) {
|
|
dev_min = 4;
|
|
/* Divide by 2 */
|
|
min_free >>= 1;
|
|
} else if (index == BTRFS_RAID_RAID1) {
|
|
dev_min = 2;
|
|
} else if (index == BTRFS_RAID_DUP) {
|
|
/* Multiply by 2 */
|
|
min_free <<= 1;
|
|
} else if (index == BTRFS_RAID_RAID0) {
|
|
dev_min = fs_devices->rw_devices;
|
|
min_free = div64_u64(min_free, dev_min);
|
|
}
|
|
|
|
/* We need to do this so that we can look at pending chunks */
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
|
|
u64 dev_offset;
|
|
|
|
/*
|
|
* check to make sure we can actually find a chunk with enough
|
|
* space to fit our block group in.
|
|
*/
|
|
if (device->total_bytes > device->bytes_used + min_free &&
|
|
!device->is_tgtdev_for_dev_replace) {
|
|
ret = find_free_dev_extent(trans, device, min_free,
|
|
&dev_offset, NULL);
|
|
if (!ret)
|
|
dev_nr++;
|
|
|
|
if (dev_nr >= dev_min)
|
|
break;
|
|
|
|
ret = -1;
|
|
}
|
|
}
|
|
if (debug && ret == -1)
|
|
btrfs_warn(fs_info,
|
|
"no space to allocate a new chunk for block group %llu",
|
|
block_group->key.objectid);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
btrfs_end_transaction(trans);
|
|
out:
|
|
btrfs_put_block_group(block_group);
|
|
return ret;
|
|
}
|
|
|
|
static int find_first_block_group(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
int ret = 0;
|
|
struct btrfs_key found_key;
|
|
struct extent_buffer *leaf;
|
|
int slot;
|
|
|
|
ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
while (1) {
|
|
slot = path->slots[0];
|
|
leaf = path->nodes[0];
|
|
if (slot >= btrfs_header_nritems(leaf)) {
|
|
ret = btrfs_next_leaf(root, path);
|
|
if (ret == 0)
|
|
continue;
|
|
if (ret < 0)
|
|
goto out;
|
|
break;
|
|
}
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
|
|
if (found_key.objectid >= key->objectid &&
|
|
found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
|
|
struct extent_map_tree *em_tree;
|
|
struct extent_map *em;
|
|
|
|
em_tree = &root->fs_info->mapping_tree.map_tree;
|
|
read_lock(&em_tree->lock);
|
|
em = lookup_extent_mapping(em_tree, found_key.objectid,
|
|
found_key.offset);
|
|
read_unlock(&em_tree->lock);
|
|
if (!em) {
|
|
btrfs_err(fs_info,
|
|
"logical %llu len %llu found bg but no related chunk",
|
|
found_key.objectid, found_key.offset);
|
|
ret = -ENOENT;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
free_extent_map(em);
|
|
goto out;
|
|
}
|
|
path->slots[0]++;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_put_block_group_cache(struct btrfs_fs_info *info)
|
|
{
|
|
struct btrfs_block_group_cache *block_group;
|
|
u64 last = 0;
|
|
|
|
while (1) {
|
|
struct inode *inode;
|
|
|
|
block_group = btrfs_lookup_first_block_group(info, last);
|
|
while (block_group) {
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->iref)
|
|
break;
|
|
spin_unlock(&block_group->lock);
|
|
block_group = next_block_group(info, block_group);
|
|
}
|
|
if (!block_group) {
|
|
if (last == 0)
|
|
break;
|
|
last = 0;
|
|
continue;
|
|
}
|
|
|
|
inode = block_group->inode;
|
|
block_group->iref = 0;
|
|
block_group->inode = NULL;
|
|
spin_unlock(&block_group->lock);
|
|
ASSERT(block_group->io_ctl.inode == NULL);
|
|
iput(inode);
|
|
last = block_group->key.objectid + block_group->key.offset;
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Must be called only after stopping all workers, since we could have block
|
|
* group caching kthreads running, and therefore they could race with us if we
|
|
* freed the block groups before stopping them.
|
|
*/
|
|
int btrfs_free_block_groups(struct btrfs_fs_info *info)
|
|
{
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_caching_control *caching_ctl;
|
|
struct rb_node *n;
|
|
|
|
down_write(&info->commit_root_sem);
|
|
while (!list_empty(&info->caching_block_groups)) {
|
|
caching_ctl = list_entry(info->caching_block_groups.next,
|
|
struct btrfs_caching_control, list);
|
|
list_del(&caching_ctl->list);
|
|
put_caching_control(caching_ctl);
|
|
}
|
|
up_write(&info->commit_root_sem);
|
|
|
|
spin_lock(&info->unused_bgs_lock);
|
|
while (!list_empty(&info->unused_bgs)) {
|
|
block_group = list_first_entry(&info->unused_bgs,
|
|
struct btrfs_block_group_cache,
|
|
bg_list);
|
|
list_del_init(&block_group->bg_list);
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
spin_unlock(&info->unused_bgs_lock);
|
|
|
|
spin_lock(&info->block_group_cache_lock);
|
|
while ((n = rb_last(&info->block_group_cache_tree)) != NULL) {
|
|
block_group = rb_entry(n, struct btrfs_block_group_cache,
|
|
cache_node);
|
|
rb_erase(&block_group->cache_node,
|
|
&info->block_group_cache_tree);
|
|
RB_CLEAR_NODE(&block_group->cache_node);
|
|
spin_unlock(&info->block_group_cache_lock);
|
|
|
|
down_write(&block_group->space_info->groups_sem);
|
|
list_del(&block_group->list);
|
|
up_write(&block_group->space_info->groups_sem);
|
|
|
|
/*
|
|
* We haven't cached this block group, which means we could
|
|
* possibly have excluded extents on this block group.
|
|
*/
|
|
if (block_group->cached == BTRFS_CACHE_NO ||
|
|
block_group->cached == BTRFS_CACHE_ERROR)
|
|
free_excluded_extents(info, block_group);
|
|
|
|
btrfs_remove_free_space_cache(block_group);
|
|
ASSERT(block_group->cached != BTRFS_CACHE_STARTED);
|
|
ASSERT(list_empty(&block_group->dirty_list));
|
|
ASSERT(list_empty(&block_group->io_list));
|
|
ASSERT(list_empty(&block_group->bg_list));
|
|
ASSERT(atomic_read(&block_group->count) == 1);
|
|
btrfs_put_block_group(block_group);
|
|
|
|
spin_lock(&info->block_group_cache_lock);
|
|
}
|
|
spin_unlock(&info->block_group_cache_lock);
|
|
|
|
/* now that all the block groups are freed, go through and
|
|
* free all the space_info structs. This is only called during
|
|
* the final stages of unmount, and so we know nobody is
|
|
* using them. We call synchronize_rcu() once before we start,
|
|
* just to be on the safe side.
|
|
*/
|
|
synchronize_rcu();
|
|
|
|
release_global_block_rsv(info);
|
|
|
|
while (!list_empty(&info->space_info)) {
|
|
int i;
|
|
|
|
space_info = list_entry(info->space_info.next,
|
|
struct btrfs_space_info,
|
|
list);
|
|
|
|
/*
|
|
* Do not hide this behind enospc_debug, this is actually
|
|
* important and indicates a real bug if this happens.
|
|
*/
|
|
if (WARN_ON(space_info->bytes_pinned > 0 ||
|
|
space_info->bytes_reserved > 0 ||
|
|
space_info->bytes_may_use > 0))
|
|
dump_space_info(info, space_info, 0, 0);
|
|
list_del(&space_info->list);
|
|
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
|
|
struct kobject *kobj;
|
|
kobj = space_info->block_group_kobjs[i];
|
|
space_info->block_group_kobjs[i] = NULL;
|
|
if (kobj) {
|
|
kobject_del(kobj);
|
|
kobject_put(kobj);
|
|
}
|
|
}
|
|
kobject_del(&space_info->kobj);
|
|
kobject_put(&space_info->kobj);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void link_block_group(struct btrfs_block_group_cache *cache)
|
|
{
|
|
struct btrfs_space_info *space_info = cache->space_info;
|
|
int index = get_block_group_index(cache);
|
|
bool first = false;
|
|
|
|
down_write(&space_info->groups_sem);
|
|
if (list_empty(&space_info->block_groups[index]))
|
|
first = true;
|
|
list_add_tail(&cache->list, &space_info->block_groups[index]);
|
|
up_write(&space_info->groups_sem);
|
|
|
|
if (first) {
|
|
struct raid_kobject *rkobj;
|
|
int ret;
|
|
|
|
rkobj = kzalloc(sizeof(*rkobj), GFP_NOFS);
|
|
if (!rkobj)
|
|
goto out_err;
|
|
rkobj->raid_type = index;
|
|
kobject_init(&rkobj->kobj, &btrfs_raid_ktype);
|
|
ret = kobject_add(&rkobj->kobj, &space_info->kobj,
|
|
"%s", get_raid_name(index));
|
|
if (ret) {
|
|
kobject_put(&rkobj->kobj);
|
|
goto out_err;
|
|
}
|
|
space_info->block_group_kobjs[index] = &rkobj->kobj;
|
|
}
|
|
|
|
return;
|
|
out_err:
|
|
btrfs_warn(cache->fs_info,
|
|
"failed to add kobject for block cache, ignoring");
|
|
}
|
|
|
|
static struct btrfs_block_group_cache *
|
|
btrfs_create_block_group_cache(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 size)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
cache = kzalloc(sizeof(*cache), GFP_NOFS);
|
|
if (!cache)
|
|
return NULL;
|
|
|
|
cache->free_space_ctl = kzalloc(sizeof(*cache->free_space_ctl),
|
|
GFP_NOFS);
|
|
if (!cache->free_space_ctl) {
|
|
kfree(cache);
|
|
return NULL;
|
|
}
|
|
|
|
cache->key.objectid = start;
|
|
cache->key.offset = size;
|
|
cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
|
|
|
|
cache->fs_info = fs_info;
|
|
cache->full_stripe_len = btrfs_full_stripe_len(fs_info, start);
|
|
set_free_space_tree_thresholds(cache);
|
|
|
|
atomic_set(&cache->count, 1);
|
|
spin_lock_init(&cache->lock);
|
|
init_rwsem(&cache->data_rwsem);
|
|
INIT_LIST_HEAD(&cache->list);
|
|
INIT_LIST_HEAD(&cache->cluster_list);
|
|
INIT_LIST_HEAD(&cache->bg_list);
|
|
INIT_LIST_HEAD(&cache->ro_list);
|
|
INIT_LIST_HEAD(&cache->dirty_list);
|
|
INIT_LIST_HEAD(&cache->io_list);
|
|
btrfs_init_free_space_ctl(cache);
|
|
atomic_set(&cache->trimming, 0);
|
|
mutex_init(&cache->free_space_lock);
|
|
btrfs_init_full_stripe_locks_tree(&cache->full_stripe_locks_root);
|
|
|
|
return cache;
|
|
}
|
|
|
|
int btrfs_read_block_groups(struct btrfs_fs_info *info)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
struct btrfs_block_group_cache *cache;
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct extent_buffer *leaf;
|
|
int need_clear = 0;
|
|
u64 cache_gen;
|
|
u64 feature;
|
|
int mixed;
|
|
|
|
feature = btrfs_super_incompat_flags(info->super_copy);
|
|
mixed = !!(feature & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS);
|
|
|
|
key.objectid = 0;
|
|
key.offset = 0;
|
|
key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
path->reada = READA_FORWARD;
|
|
|
|
cache_gen = btrfs_super_cache_generation(info->super_copy);
|
|
if (btrfs_test_opt(info, SPACE_CACHE) &&
|
|
btrfs_super_generation(info->super_copy) != cache_gen)
|
|
need_clear = 1;
|
|
if (btrfs_test_opt(info, CLEAR_CACHE))
|
|
need_clear = 1;
|
|
|
|
while (1) {
|
|
ret = find_first_block_group(info, path, &key);
|
|
if (ret > 0)
|
|
break;
|
|
if (ret != 0)
|
|
goto error;
|
|
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
|
|
cache = btrfs_create_block_group_cache(info, found_key.objectid,
|
|
found_key.offset);
|
|
if (!cache) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (need_clear) {
|
|
/*
|
|
* When we mount with old space cache, we need to
|
|
* set BTRFS_DC_CLEAR and set dirty flag.
|
|
*
|
|
* a) Setting 'BTRFS_DC_CLEAR' makes sure that we
|
|
* truncate the old free space cache inode and
|
|
* setup a new one.
|
|
* b) Setting 'dirty flag' makes sure that we flush
|
|
* the new space cache info onto disk.
|
|
*/
|
|
if (btrfs_test_opt(info, SPACE_CACHE))
|
|
cache->disk_cache_state = BTRFS_DC_CLEAR;
|
|
}
|
|
|
|
read_extent_buffer(leaf, &cache->item,
|
|
btrfs_item_ptr_offset(leaf, path->slots[0]),
|
|
sizeof(cache->item));
|
|
cache->flags = btrfs_block_group_flags(&cache->item);
|
|
if (!mixed &&
|
|
((cache->flags & BTRFS_BLOCK_GROUP_METADATA) &&
|
|
(cache->flags & BTRFS_BLOCK_GROUP_DATA))) {
|
|
btrfs_err(info,
|
|
"bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups",
|
|
cache->key.objectid);
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
key.objectid = found_key.objectid + found_key.offset;
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* We need to exclude the super stripes now so that the space
|
|
* info has super bytes accounted for, otherwise we'll think
|
|
* we have more space than we actually do.
|
|
*/
|
|
ret = exclude_super_stripes(info, cache);
|
|
if (ret) {
|
|
/*
|
|
* We may have excluded something, so call this just in
|
|
* case.
|
|
*/
|
|
free_excluded_extents(info, cache);
|
|
btrfs_put_block_group(cache);
|
|
goto error;
|
|
}
|
|
|
|
/*
|
|
* check for two cases, either we are full, and therefore
|
|
* don't need to bother with the caching work since we won't
|
|
* find any space, or we are empty, and we can just add all
|
|
* the space in and be done with it. This saves us _alot_ of
|
|
* time, particularly in the full case.
|
|
*/
|
|
if (found_key.offset == btrfs_block_group_used(&cache->item)) {
|
|
cache->last_byte_to_unpin = (u64)-1;
|
|
cache->cached = BTRFS_CACHE_FINISHED;
|
|
free_excluded_extents(info, cache);
|
|
} else if (btrfs_block_group_used(&cache->item) == 0) {
|
|
cache->last_byte_to_unpin = (u64)-1;
|
|
cache->cached = BTRFS_CACHE_FINISHED;
|
|
add_new_free_space(cache, info,
|
|
found_key.objectid,
|
|
found_key.objectid +
|
|
found_key.offset);
|
|
free_excluded_extents(info, cache);
|
|
}
|
|
|
|
ret = btrfs_add_block_group_cache(info, cache);
|
|
if (ret) {
|
|
btrfs_remove_free_space_cache(cache);
|
|
btrfs_put_block_group(cache);
|
|
goto error;
|
|
}
|
|
|
|
trace_btrfs_add_block_group(info, cache, 0);
|
|
update_space_info(info, cache->flags, found_key.offset,
|
|
btrfs_block_group_used(&cache->item),
|
|
cache->bytes_super, &space_info);
|
|
|
|
cache->space_info = space_info;
|
|
|
|
link_block_group(cache);
|
|
|
|
set_avail_alloc_bits(info, cache->flags);
|
|
if (btrfs_chunk_readonly(info, cache->key.objectid)) {
|
|
inc_block_group_ro(cache, 1);
|
|
} else if (btrfs_block_group_used(&cache->item) == 0) {
|
|
spin_lock(&info->unused_bgs_lock);
|
|
/* Should always be true but just in case. */
|
|
if (list_empty(&cache->bg_list)) {
|
|
btrfs_get_block_group(cache);
|
|
list_add_tail(&cache->bg_list,
|
|
&info->unused_bgs);
|
|
}
|
|
spin_unlock(&info->unused_bgs_lock);
|
|
}
|
|
}
|
|
|
|
list_for_each_entry_rcu(space_info, &info->space_info, list) {
|
|
if (!(get_alloc_profile(info, space_info->flags) &
|
|
(BTRFS_BLOCK_GROUP_RAID10 |
|
|
BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID5 |
|
|
BTRFS_BLOCK_GROUP_RAID6 |
|
|
BTRFS_BLOCK_GROUP_DUP)))
|
|
continue;
|
|
/*
|
|
* avoid allocating from un-mirrored block group if there are
|
|
* mirrored block groups.
|
|
*/
|
|
list_for_each_entry(cache,
|
|
&space_info->block_groups[BTRFS_RAID_RAID0],
|
|
list)
|
|
inc_block_group_ro(cache, 1);
|
|
list_for_each_entry(cache,
|
|
&space_info->block_groups[BTRFS_RAID_SINGLE],
|
|
list)
|
|
inc_block_group_ro(cache, 1);
|
|
}
|
|
|
|
init_global_block_rsv(info);
|
|
ret = 0;
|
|
error:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group_cache *block_group, *tmp;
|
|
struct btrfs_root *extent_root = fs_info->extent_root;
|
|
struct btrfs_block_group_item item;
|
|
struct btrfs_key key;
|
|
int ret = 0;
|
|
bool can_flush_pending_bgs = trans->can_flush_pending_bgs;
|
|
|
|
trans->can_flush_pending_bgs = false;
|
|
list_for_each_entry_safe(block_group, tmp, &trans->new_bgs, bg_list) {
|
|
if (ret)
|
|
goto next;
|
|
|
|
spin_lock(&block_group->lock);
|
|
memcpy(&item, &block_group->item, sizeof(item));
|
|
memcpy(&key, &block_group->key, sizeof(key));
|
|
spin_unlock(&block_group->lock);
|
|
|
|
ret = btrfs_insert_item(trans, extent_root, &key, &item,
|
|
sizeof(item));
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
ret = btrfs_finish_chunk_alloc(trans, fs_info, key.objectid,
|
|
key.offset);
|
|
if (ret)
|
|
btrfs_abort_transaction(trans, ret);
|
|
add_block_group_free_space(trans, fs_info, block_group);
|
|
/* already aborted the transaction if it failed. */
|
|
next:
|
|
list_del_init(&block_group->bg_list);
|
|
}
|
|
trans->can_flush_pending_bgs = can_flush_pending_bgs;
|
|
}
|
|
|
|
int btrfs_make_block_group(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 bytes_used,
|
|
u64 type, u64 chunk_offset, u64 size)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
int ret;
|
|
|
|
btrfs_set_log_full_commit(fs_info, trans);
|
|
|
|
cache = btrfs_create_block_group_cache(fs_info, chunk_offset, size);
|
|
if (!cache)
|
|
return -ENOMEM;
|
|
|
|
btrfs_set_block_group_used(&cache->item, bytes_used);
|
|
btrfs_set_block_group_chunk_objectid(&cache->item,
|
|
BTRFS_FIRST_CHUNK_TREE_OBJECTID);
|
|
btrfs_set_block_group_flags(&cache->item, type);
|
|
|
|
cache->flags = type;
|
|
cache->last_byte_to_unpin = (u64)-1;
|
|
cache->cached = BTRFS_CACHE_FINISHED;
|
|
cache->needs_free_space = 1;
|
|
ret = exclude_super_stripes(fs_info, cache);
|
|
if (ret) {
|
|
/*
|
|
* We may have excluded something, so call this just in
|
|
* case.
|
|
*/
|
|
free_excluded_extents(fs_info, cache);
|
|
btrfs_put_block_group(cache);
|
|
return ret;
|
|
}
|
|
|
|
add_new_free_space(cache, fs_info, chunk_offset, chunk_offset + size);
|
|
|
|
free_excluded_extents(fs_info, cache);
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
if (btrfs_should_fragment_free_space(cache)) {
|
|
u64 new_bytes_used = size - bytes_used;
|
|
|
|
bytes_used += new_bytes_used >> 1;
|
|
fragment_free_space(cache);
|
|
}
|
|
#endif
|
|
/*
|
|
* Ensure the corresponding space_info object is created and
|
|
* assigned to our block group. We want our bg to be added to the rbtree
|
|
* with its ->space_info set.
|
|
*/
|
|
cache->space_info = __find_space_info(fs_info, cache->flags);
|
|
if (!cache->space_info) {
|
|
ret = create_space_info(fs_info, cache->flags,
|
|
&cache->space_info);
|
|
if (ret) {
|
|
btrfs_remove_free_space_cache(cache);
|
|
btrfs_put_block_group(cache);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
ret = btrfs_add_block_group_cache(fs_info, cache);
|
|
if (ret) {
|
|
btrfs_remove_free_space_cache(cache);
|
|
btrfs_put_block_group(cache);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Now that our block group has its ->space_info set and is inserted in
|
|
* the rbtree, update the space info's counters.
|
|
*/
|
|
trace_btrfs_add_block_group(fs_info, cache, 1);
|
|
update_space_info(fs_info, cache->flags, size, bytes_used,
|
|
cache->bytes_super, &cache->space_info);
|
|
update_global_block_rsv(fs_info);
|
|
|
|
link_block_group(cache);
|
|
|
|
list_add_tail(&cache->bg_list, &trans->new_bgs);
|
|
|
|
set_avail_alloc_bits(fs_info, type);
|
|
return 0;
|
|
}
|
|
|
|
static void clear_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
|
|
{
|
|
u64 extra_flags = chunk_to_extended(flags) &
|
|
BTRFS_EXTENDED_PROFILE_MASK;
|
|
|
|
write_seqlock(&fs_info->profiles_lock);
|
|
if (flags & BTRFS_BLOCK_GROUP_DATA)
|
|
fs_info->avail_data_alloc_bits &= ~extra_flags;
|
|
if (flags & BTRFS_BLOCK_GROUP_METADATA)
|
|
fs_info->avail_metadata_alloc_bits &= ~extra_flags;
|
|
if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
|
|
fs_info->avail_system_alloc_bits &= ~extra_flags;
|
|
write_sequnlock(&fs_info->profiles_lock);
|
|
}
|
|
|
|
int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info, u64 group_start,
|
|
struct extent_map *em)
|
|
{
|
|
struct btrfs_root *root = fs_info->extent_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_free_cluster *cluster;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_key key;
|
|
struct inode *inode;
|
|
struct kobject *kobj = NULL;
|
|
int ret;
|
|
int index;
|
|
int factor;
|
|
struct btrfs_caching_control *caching_ctl = NULL;
|
|
bool remove_em;
|
|
|
|
block_group = btrfs_lookup_block_group(fs_info, group_start);
|
|
BUG_ON(!block_group);
|
|
BUG_ON(!block_group->ro);
|
|
|
|
/*
|
|
* Free the reserved super bytes from this block group before
|
|
* remove it.
|
|
*/
|
|
free_excluded_extents(fs_info, block_group);
|
|
btrfs_free_ref_tree_range(fs_info, block_group->key.objectid,
|
|
block_group->key.offset);
|
|
|
|
memcpy(&key, &block_group->key, sizeof(key));
|
|
index = get_block_group_index(block_group);
|
|
if (block_group->flags & (BTRFS_BLOCK_GROUP_DUP |
|
|
BTRFS_BLOCK_GROUP_RAID1 |
|
|
BTRFS_BLOCK_GROUP_RAID10))
|
|
factor = 2;
|
|
else
|
|
factor = 1;
|
|
|
|
/* make sure this block group isn't part of an allocation cluster */
|
|
cluster = &fs_info->data_alloc_cluster;
|
|
spin_lock(&cluster->refill_lock);
|
|
btrfs_return_cluster_to_free_space(block_group, cluster);
|
|
spin_unlock(&cluster->refill_lock);
|
|
|
|
/*
|
|
* make sure this block group isn't part of a metadata
|
|
* allocation cluster
|
|
*/
|
|
cluster = &fs_info->meta_alloc_cluster;
|
|
spin_lock(&cluster->refill_lock);
|
|
btrfs_return_cluster_to_free_space(block_group, cluster);
|
|
spin_unlock(&cluster->refill_lock);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* get the inode first so any iput calls done for the io_list
|
|
* aren't the final iput (no unlinks allowed now)
|
|
*/
|
|
inode = lookup_free_space_inode(fs_info, block_group, path);
|
|
|
|
mutex_lock(&trans->transaction->cache_write_mutex);
|
|
/*
|
|
* make sure our free spache cache IO is done before remove the
|
|
* free space inode
|
|
*/
|
|
spin_lock(&trans->transaction->dirty_bgs_lock);
|
|
if (!list_empty(&block_group->io_list)) {
|
|
list_del_init(&block_group->io_list);
|
|
|
|
WARN_ON(!IS_ERR(inode) && inode != block_group->io_ctl.inode);
|
|
|
|
spin_unlock(&trans->transaction->dirty_bgs_lock);
|
|
btrfs_wait_cache_io(trans, block_group, path);
|
|
btrfs_put_block_group(block_group);
|
|
spin_lock(&trans->transaction->dirty_bgs_lock);
|
|
}
|
|
|
|
if (!list_empty(&block_group->dirty_list)) {
|
|
list_del_init(&block_group->dirty_list);
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
spin_unlock(&trans->transaction->dirty_bgs_lock);
|
|
mutex_unlock(&trans->transaction->cache_write_mutex);
|
|
|
|
if (!IS_ERR(inode)) {
|
|
ret = btrfs_orphan_add(trans, BTRFS_I(inode));
|
|
if (ret) {
|
|
btrfs_add_delayed_iput(inode);
|
|
goto out;
|
|
}
|
|
clear_nlink(inode);
|
|
/* One for the block groups ref */
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->iref) {
|
|
block_group->iref = 0;
|
|
block_group->inode = NULL;
|
|
spin_unlock(&block_group->lock);
|
|
iput(inode);
|
|
} else {
|
|
spin_unlock(&block_group->lock);
|
|
}
|
|
/* One for our lookup ref */
|
|
btrfs_add_delayed_iput(inode);
|
|
}
|
|
|
|
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
|
|
key.offset = block_group->key.objectid;
|
|
key.type = 0;
|
|
|
|
ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret > 0)
|
|
btrfs_release_path(path);
|
|
if (ret == 0) {
|
|
ret = btrfs_del_item(trans, tree_root, path);
|
|
if (ret)
|
|
goto out;
|
|
btrfs_release_path(path);
|
|
}
|
|
|
|
spin_lock(&fs_info->block_group_cache_lock);
|
|
rb_erase(&block_group->cache_node,
|
|
&fs_info->block_group_cache_tree);
|
|
RB_CLEAR_NODE(&block_group->cache_node);
|
|
|
|
if (fs_info->first_logical_byte == block_group->key.objectid)
|
|
fs_info->first_logical_byte = (u64)-1;
|
|
spin_unlock(&fs_info->block_group_cache_lock);
|
|
|
|
down_write(&block_group->space_info->groups_sem);
|
|
/*
|
|
* we must use list_del_init so people can check to see if they
|
|
* are still on the list after taking the semaphore
|
|
*/
|
|
list_del_init(&block_group->list);
|
|
if (list_empty(&block_group->space_info->block_groups[index])) {
|
|
kobj = block_group->space_info->block_group_kobjs[index];
|
|
block_group->space_info->block_group_kobjs[index] = NULL;
|
|
clear_avail_alloc_bits(fs_info, block_group->flags);
|
|
}
|
|
up_write(&block_group->space_info->groups_sem);
|
|
if (kobj) {
|
|
kobject_del(kobj);
|
|
kobject_put(kobj);
|
|
}
|
|
|
|
if (block_group->has_caching_ctl)
|
|
caching_ctl = get_caching_control(block_group);
|
|
if (block_group->cached == BTRFS_CACHE_STARTED)
|
|
wait_block_group_cache_done(block_group);
|
|
if (block_group->has_caching_ctl) {
|
|
down_write(&fs_info->commit_root_sem);
|
|
if (!caching_ctl) {
|
|
struct btrfs_caching_control *ctl;
|
|
|
|
list_for_each_entry(ctl,
|
|
&fs_info->caching_block_groups, list)
|
|
if (ctl->block_group == block_group) {
|
|
caching_ctl = ctl;
|
|
refcount_inc(&caching_ctl->count);
|
|
break;
|
|
}
|
|
}
|
|
if (caching_ctl)
|
|
list_del_init(&caching_ctl->list);
|
|
up_write(&fs_info->commit_root_sem);
|
|
if (caching_ctl) {
|
|
/* Once for the caching bgs list and once for us. */
|
|
put_caching_control(caching_ctl);
|
|
put_caching_control(caching_ctl);
|
|
}
|
|
}
|
|
|
|
spin_lock(&trans->transaction->dirty_bgs_lock);
|
|
if (!list_empty(&block_group->dirty_list)) {
|
|
WARN_ON(1);
|
|
}
|
|
if (!list_empty(&block_group->io_list)) {
|
|
WARN_ON(1);
|
|
}
|
|
spin_unlock(&trans->transaction->dirty_bgs_lock);
|
|
btrfs_remove_free_space_cache(block_group);
|
|
|
|
spin_lock(&block_group->space_info->lock);
|
|
list_del_init(&block_group->ro_list);
|
|
|
|
if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
|
|
WARN_ON(block_group->space_info->total_bytes
|
|
< block_group->key.offset);
|
|
WARN_ON(block_group->space_info->bytes_readonly
|
|
< block_group->key.offset);
|
|
WARN_ON(block_group->space_info->disk_total
|
|
< block_group->key.offset * factor);
|
|
}
|
|
block_group->space_info->total_bytes -= block_group->key.offset;
|
|
block_group->space_info->bytes_readonly -= block_group->key.offset;
|
|
block_group->space_info->disk_total -= block_group->key.offset * factor;
|
|
|
|
spin_unlock(&block_group->space_info->lock);
|
|
|
|
memcpy(&key, &block_group->key, sizeof(key));
|
|
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
if (!list_empty(&em->list)) {
|
|
/* We're in the transaction->pending_chunks list. */
|
|
free_extent_map(em);
|
|
}
|
|
spin_lock(&block_group->lock);
|
|
block_group->removed = 1;
|
|
/*
|
|
* At this point trimming can't start on this block group, because we
|
|
* removed the block group from the tree fs_info->block_group_cache_tree
|
|
* so no one can't find it anymore and even if someone already got this
|
|
* block group before we removed it from the rbtree, they have already
|
|
* incremented block_group->trimming - if they didn't, they won't find
|
|
* any free space entries because we already removed them all when we
|
|
* called btrfs_remove_free_space_cache().
|
|
*
|
|
* And we must not remove the extent map from the fs_info->mapping_tree
|
|
* to prevent the same logical address range and physical device space
|
|
* ranges from being reused for a new block group. This is because our
|
|
* fs trim operation (btrfs_trim_fs() / btrfs_ioctl_fitrim()) is
|
|
* completely transactionless, so while it is trimming a range the
|
|
* currently running transaction might finish and a new one start,
|
|
* allowing for new block groups to be created that can reuse the same
|
|
* physical device locations unless we take this special care.
|
|
*
|
|
* There may also be an implicit trim operation if the file system
|
|
* is mounted with -odiscard. The same protections must remain
|
|
* in place until the extents have been discarded completely when
|
|
* the transaction commit has completed.
|
|
*/
|
|
remove_em = (atomic_read(&block_group->trimming) == 0);
|
|
/*
|
|
* Make sure a trimmer task always sees the em in the pinned_chunks list
|
|
* if it sees block_group->removed == 1 (needs to lock block_group->lock
|
|
* before checking block_group->removed).
|
|
*/
|
|
if (!remove_em) {
|
|
/*
|
|
* Our em might be in trans->transaction->pending_chunks which
|
|
* is protected by fs_info->chunk_mutex ([lock|unlock]_chunks),
|
|
* and so is the fs_info->pinned_chunks list.
|
|
*
|
|
* So at this point we must be holding the chunk_mutex to avoid
|
|
* any races with chunk allocation (more specifically at
|
|
* volumes.c:contains_pending_extent()), to ensure it always
|
|
* sees the em, either in the pending_chunks list or in the
|
|
* pinned_chunks list.
|
|
*/
|
|
list_move_tail(&em->list, &fs_info->pinned_chunks);
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
|
|
if (remove_em) {
|
|
struct extent_map_tree *em_tree;
|
|
|
|
em_tree = &fs_info->mapping_tree.map_tree;
|
|
write_lock(&em_tree->lock);
|
|
/*
|
|
* The em might be in the pending_chunks list, so make sure the
|
|
* chunk mutex is locked, since remove_extent_mapping() will
|
|
* delete us from that list.
|
|
*/
|
|
remove_extent_mapping(em_tree, em);
|
|
write_unlock(&em_tree->lock);
|
|
/* once for the tree */
|
|
free_extent_map(em);
|
|
}
|
|
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
|
|
ret = remove_block_group_free_space(trans, fs_info, block_group);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_put_block_group(block_group);
|
|
btrfs_put_block_group(block_group);
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret > 0)
|
|
ret = -EIO;
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = btrfs_del_item(trans, root, path);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_trans_handle *
|
|
btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info,
|
|
const u64 chunk_offset)
|
|
{
|
|
struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree;
|
|
struct extent_map *em;
|
|
struct map_lookup *map;
|
|
unsigned int num_items;
|
|
|
|
read_lock(&em_tree->lock);
|
|
em = lookup_extent_mapping(em_tree, chunk_offset, 1);
|
|
read_unlock(&em_tree->lock);
|
|
ASSERT(em && em->start == chunk_offset);
|
|
|
|
/*
|
|
* We need to reserve 3 + N units from the metadata space info in order
|
|
* to remove a block group (done at btrfs_remove_chunk() and at
|
|
* btrfs_remove_block_group()), which are used for:
|
|
*
|
|
* 1 unit for adding the free space inode's orphan (located in the tree
|
|
* of tree roots).
|
|
* 1 unit for deleting the block group item (located in the extent
|
|
* tree).
|
|
* 1 unit for deleting the free space item (located in tree of tree
|
|
* roots).
|
|
* N units for deleting N device extent items corresponding to each
|
|
* stripe (located in the device tree).
|
|
*
|
|
* In order to remove a block group we also need to reserve units in the
|
|
* system space info in order to update the chunk tree (update one or
|
|
* more device items and remove one chunk item), but this is done at
|
|
* btrfs_remove_chunk() through a call to check_system_chunk().
|
|
*/
|
|
map = em->map_lookup;
|
|
num_items = 3 + map->num_stripes;
|
|
free_extent_map(em);
|
|
|
|
return btrfs_start_transaction_fallback_global_rsv(fs_info->extent_root,
|
|
num_items, 1);
|
|
}
|
|
|
|
/*
|
|
* Process the unused_bgs list and remove any that don't have any allocated
|
|
* space inside of them.
|
|
*/
|
|
void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group_cache *block_group;
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_trans_handle *trans;
|
|
int ret = 0;
|
|
|
|
if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
|
|
return;
|
|
|
|
spin_lock(&fs_info->unused_bgs_lock);
|
|
while (!list_empty(&fs_info->unused_bgs)) {
|
|
u64 start, end;
|
|
int trimming;
|
|
|
|
block_group = list_first_entry(&fs_info->unused_bgs,
|
|
struct btrfs_block_group_cache,
|
|
bg_list);
|
|
list_del_init(&block_group->bg_list);
|
|
|
|
space_info = block_group->space_info;
|
|
|
|
if (ret || btrfs_mixed_space_info(space_info)) {
|
|
btrfs_put_block_group(block_group);
|
|
continue;
|
|
}
|
|
spin_unlock(&fs_info->unused_bgs_lock);
|
|
|
|
mutex_lock(&fs_info->delete_unused_bgs_mutex);
|
|
|
|
/* Don't want to race with allocators so take the groups_sem */
|
|
down_write(&space_info->groups_sem);
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->reserved ||
|
|
btrfs_block_group_used(&block_group->item) ||
|
|
block_group->ro ||
|
|
list_is_singular(&block_group->list)) {
|
|
/*
|
|
* We want to bail if we made new allocations or have
|
|
* outstanding allocations in this block group. We do
|
|
* the ro check in case balance is currently acting on
|
|
* this block group.
|
|
*/
|
|
spin_unlock(&block_group->lock);
|
|
up_write(&space_info->groups_sem);
|
|
goto next;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
|
|
/* We don't want to force the issue, only flip if it's ok. */
|
|
ret = inc_block_group_ro(block_group, 0);
|
|
up_write(&space_info->groups_sem);
|
|
if (ret < 0) {
|
|
ret = 0;
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* Want to do this before we do anything else so we can recover
|
|
* properly if we fail to join the transaction.
|
|
*/
|
|
trans = btrfs_start_trans_remove_block_group(fs_info,
|
|
block_group->key.objectid);
|
|
if (IS_ERR(trans)) {
|
|
btrfs_dec_block_group_ro(block_group);
|
|
ret = PTR_ERR(trans);
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* We could have pending pinned extents for this block group,
|
|
* just delete them, we don't care about them anymore.
|
|
*/
|
|
start = block_group->key.objectid;
|
|
end = start + block_group->key.offset - 1;
|
|
/*
|
|
* Hold the unused_bg_unpin_mutex lock to avoid racing with
|
|
* btrfs_finish_extent_commit(). If we are at transaction N,
|
|
* another task might be running finish_extent_commit() for the
|
|
* previous transaction N - 1, and have seen a range belonging
|
|
* to the block group in freed_extents[] before we were able to
|
|
* clear the whole block group range from freed_extents[]. This
|
|
* means that task can lookup for the block group after we
|
|
* unpinned it from freed_extents[] and removed it, leading to
|
|
* a BUG_ON() at btrfs_unpin_extent_range().
|
|
*/
|
|
mutex_lock(&fs_info->unused_bg_unpin_mutex);
|
|
ret = clear_extent_bits(&fs_info->freed_extents[0], start, end,
|
|
EXTENT_DIRTY);
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
btrfs_dec_block_group_ro(block_group);
|
|
goto end_trans;
|
|
}
|
|
ret = clear_extent_bits(&fs_info->freed_extents[1], start, end,
|
|
EXTENT_DIRTY);
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
btrfs_dec_block_group_ro(block_group);
|
|
goto end_trans;
|
|
}
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
|
|
/* Reset pinned so btrfs_put_block_group doesn't complain */
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&block_group->lock);
|
|
|
|
space_info->bytes_pinned -= block_group->pinned;
|
|
space_info->bytes_readonly += block_group->pinned;
|
|
percpu_counter_add(&space_info->total_bytes_pinned,
|
|
-block_group->pinned);
|
|
block_group->pinned = 0;
|
|
|
|
spin_unlock(&block_group->lock);
|
|
spin_unlock(&space_info->lock);
|
|
|
|
/* DISCARD can flip during remount */
|
|
trimming = btrfs_test_opt(fs_info, DISCARD);
|
|
|
|
/* Implicit trim during transaction commit. */
|
|
if (trimming)
|
|
btrfs_get_block_group_trimming(block_group);
|
|
|
|
/*
|
|
* Btrfs_remove_chunk will abort the transaction if things go
|
|
* horribly wrong.
|
|
*/
|
|
ret = btrfs_remove_chunk(trans, fs_info,
|
|
block_group->key.objectid);
|
|
|
|
if (ret) {
|
|
if (trimming)
|
|
btrfs_put_block_group_trimming(block_group);
|
|
goto end_trans;
|
|
}
|
|
|
|
/*
|
|
* If we're not mounted with -odiscard, we can just forget
|
|
* about this block group. Otherwise we'll need to wait
|
|
* until transaction commit to do the actual discard.
|
|
*/
|
|
if (trimming) {
|
|
spin_lock(&fs_info->unused_bgs_lock);
|
|
/*
|
|
* A concurrent scrub might have added us to the list
|
|
* fs_info->unused_bgs, so use a list_move operation
|
|
* to add the block group to the deleted_bgs list.
|
|
*/
|
|
list_move(&block_group->bg_list,
|
|
&trans->transaction->deleted_bgs);
|
|
spin_unlock(&fs_info->unused_bgs_lock);
|
|
btrfs_get_block_group(block_group);
|
|
}
|
|
end_trans:
|
|
btrfs_end_transaction(trans);
|
|
next:
|
|
mutex_unlock(&fs_info->delete_unused_bgs_mutex);
|
|
btrfs_put_block_group(block_group);
|
|
spin_lock(&fs_info->unused_bgs_lock);
|
|
}
|
|
spin_unlock(&fs_info->unused_bgs_lock);
|
|
}
|
|
|
|
int btrfs_init_space_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_space_info *space_info;
|
|
struct btrfs_super_block *disk_super;
|
|
u64 features;
|
|
u64 flags;
|
|
int mixed = 0;
|
|
int ret;
|
|
|
|
disk_super = fs_info->super_copy;
|
|
if (!btrfs_super_root(disk_super))
|
|
return -EINVAL;
|
|
|
|
features = btrfs_super_incompat_flags(disk_super);
|
|
if (features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
|
|
mixed = 1;
|
|
|
|
flags = BTRFS_BLOCK_GROUP_SYSTEM;
|
|
ret = create_space_info(fs_info, flags, &space_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (mixed) {
|
|
flags = BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA;
|
|
ret = create_space_info(fs_info, flags, &space_info);
|
|
} else {
|
|
flags = BTRFS_BLOCK_GROUP_METADATA;
|
|
ret = create_space_info(fs_info, flags, &space_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
flags = BTRFS_BLOCK_GROUP_DATA;
|
|
ret = create_space_info(fs_info, flags, &space_info);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
|
|
u64 start, u64 end)
|
|
{
|
|
return unpin_extent_range(fs_info, start, end, false);
|
|
}
|
|
|
|
/*
|
|
* It used to be that old block groups would be left around forever.
|
|
* Iterating over them would be enough to trim unused space. Since we
|
|
* now automatically remove them, we also need to iterate over unallocated
|
|
* space.
|
|
*
|
|
* We don't want a transaction for this since the discard may take a
|
|
* substantial amount of time. We don't require that a transaction be
|
|
* running, but we do need to take a running transaction into account
|
|
* to ensure that we're not discarding chunks that were released in
|
|
* the current transaction.
|
|
*
|
|
* Holding the chunks lock will prevent other threads from allocating
|
|
* or releasing chunks, but it won't prevent a running transaction
|
|
* from committing and releasing the memory that the pending chunks
|
|
* list head uses. For that, we need to take a reference to the
|
|
* transaction.
|
|
*/
|
|
static int btrfs_trim_free_extents(struct btrfs_device *device,
|
|
u64 minlen, u64 *trimmed)
|
|
{
|
|
u64 start = 0, len = 0;
|
|
int ret;
|
|
|
|
*trimmed = 0;
|
|
|
|
/* Not writeable = nothing to do. */
|
|
if (!device->writeable)
|
|
return 0;
|
|
|
|
/* No free space = nothing to do. */
|
|
if (device->total_bytes <= device->bytes_used)
|
|
return 0;
|
|
|
|
ret = 0;
|
|
|
|
while (1) {
|
|
struct btrfs_fs_info *fs_info = device->fs_info;
|
|
struct btrfs_transaction *trans;
|
|
u64 bytes;
|
|
|
|
ret = mutex_lock_interruptible(&fs_info->chunk_mutex);
|
|
if (ret)
|
|
return ret;
|
|
|
|
down_read(&fs_info->commit_root_sem);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
trans = fs_info->running_transaction;
|
|
if (trans)
|
|
refcount_inc(&trans->use_count);
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
ret = find_free_dev_extent_start(trans, device, minlen, start,
|
|
&start, &len);
|
|
if (trans)
|
|
btrfs_put_transaction(trans);
|
|
|
|
if (ret) {
|
|
up_read(&fs_info->commit_root_sem);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
if (ret == -ENOSPC)
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
ret = btrfs_issue_discard(device->bdev, start, len, &bytes);
|
|
up_read(&fs_info->commit_root_sem);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
|
|
if (ret)
|
|
break;
|
|
|
|
start += len;
|
|
*trimmed += bytes;
|
|
|
|
if (fatal_signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
|
|
{
|
|
struct btrfs_block_group_cache *cache = NULL;
|
|
struct btrfs_device *device;
|
|
struct list_head *devices;
|
|
u64 group_trimmed;
|
|
u64 start;
|
|
u64 end;
|
|
u64 trimmed = 0;
|
|
u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
|
|
int ret = 0;
|
|
|
|
/*
|
|
* try to trim all FS space, our block group may start from non-zero.
|
|
*/
|
|
if (range->len == total_bytes)
|
|
cache = btrfs_lookup_first_block_group(fs_info, range->start);
|
|
else
|
|
cache = btrfs_lookup_block_group(fs_info, range->start);
|
|
|
|
while (cache) {
|
|
if (cache->key.objectid >= (range->start + range->len)) {
|
|
btrfs_put_block_group(cache);
|
|
break;
|
|
}
|
|
|
|
start = max(range->start, cache->key.objectid);
|
|
end = min(range->start + range->len,
|
|
cache->key.objectid + cache->key.offset);
|
|
|
|
if (end - start >= range->minlen) {
|
|
if (!block_group_cache_done(cache)) {
|
|
ret = cache_block_group(cache, 0);
|
|
if (ret) {
|
|
btrfs_put_block_group(cache);
|
|
break;
|
|
}
|
|
ret = wait_block_group_cache_done(cache);
|
|
if (ret) {
|
|
btrfs_put_block_group(cache);
|
|
break;
|
|
}
|
|
}
|
|
ret = btrfs_trim_block_group(cache,
|
|
&group_trimmed,
|
|
start,
|
|
end,
|
|
range->minlen);
|
|
|
|
trimmed += group_trimmed;
|
|
if (ret) {
|
|
btrfs_put_block_group(cache);
|
|
break;
|
|
}
|
|
}
|
|
|
|
cache = next_block_group(fs_info, cache);
|
|
}
|
|
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
devices = &fs_info->fs_devices->alloc_list;
|
|
list_for_each_entry(device, devices, dev_alloc_list) {
|
|
ret = btrfs_trim_free_extents(device, range->minlen,
|
|
&group_trimmed);
|
|
if (ret)
|
|
break;
|
|
|
|
trimmed += group_trimmed;
|
|
}
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
|
|
range->len = trimmed;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* btrfs_{start,end}_write_no_snapshotting() are similar to
|
|
* mnt_{want,drop}_write(), they are used to prevent some tasks from writing
|
|
* data into the page cache through nocow before the subvolume is snapshoted,
|
|
* but flush the data into disk after the snapshot creation, or to prevent
|
|
* operations while snapshotting is ongoing and that cause the snapshot to be
|
|
* inconsistent (writes followed by expanding truncates for example).
|
|
*/
|
|
void btrfs_end_write_no_snapshotting(struct btrfs_root *root)
|
|
{
|
|
percpu_counter_dec(&root->subv_writers->counter);
|
|
/*
|
|
* Make sure counter is updated before we wake up waiters.
|
|
*/
|
|
smp_mb();
|
|
if (waitqueue_active(&root->subv_writers->wait))
|
|
wake_up(&root->subv_writers->wait);
|
|
}
|
|
|
|
int btrfs_start_write_no_snapshotting(struct btrfs_root *root)
|
|
{
|
|
if (atomic_read(&root->will_be_snapshotted))
|
|
return 0;
|
|
|
|
percpu_counter_inc(&root->subv_writers->counter);
|
|
/*
|
|
* Make sure counter is updated before we check for snapshot creation.
|
|
*/
|
|
smp_mb();
|
|
if (atomic_read(&root->will_be_snapshotted)) {
|
|
btrfs_end_write_no_snapshotting(root);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
void btrfs_wait_for_snapshot_creation(struct btrfs_root *root)
|
|
{
|
|
while (true) {
|
|
int ret;
|
|
|
|
ret = btrfs_start_write_no_snapshotting(root);
|
|
if (ret)
|
|
break;
|
|
wait_on_atomic_t(&root->will_be_snapshotted, atomic_t_wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
}
|
|
}
|