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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4663 lines
126 KiB
C
4663 lines
126 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/fs.h>
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#include <linux/blkdev.h>
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#include <linux/scatterlist.h>
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#include <linux/swap.h>
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#include <linux/radix-tree.h>
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#include <linux/writeback.h>
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#include <linux/buffer_head.h>
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/migrate.h>
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#include <linux/ratelimit.h>
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#include <linux/uuid.h>
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#include <linux/semaphore.h>
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#include <asm/unaligned.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "hash.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "volumes.h"
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#include "print-tree.h"
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#include "locking.h"
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#include "tree-log.h"
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#include "free-space-cache.h"
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#include "free-space-tree.h"
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#include "inode-map.h"
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#include "check-integrity.h"
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#include "rcu-string.h"
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#include "dev-replace.h"
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#include "raid56.h"
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#include "sysfs.h"
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#include "qgroup.h"
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#include "compression.h"
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#ifdef CONFIG_X86
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#include <asm/cpufeature.h>
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#endif
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#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
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BTRFS_HEADER_FLAG_RELOC |\
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BTRFS_SUPER_FLAG_ERROR |\
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BTRFS_SUPER_FLAG_SEEDING |\
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BTRFS_SUPER_FLAG_METADUMP)
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static const struct extent_io_ops btree_extent_io_ops;
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static void end_workqueue_fn(struct btrfs_work *work);
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static void free_fs_root(struct btrfs_root *root);
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static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
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int read_only);
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static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
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static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
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struct btrfs_root *root);
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static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
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static int btrfs_destroy_marked_extents(struct btrfs_root *root,
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struct extent_io_tree *dirty_pages,
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int mark);
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static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
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struct extent_io_tree *pinned_extents);
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static int btrfs_cleanup_transaction(struct btrfs_root *root);
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static void btrfs_error_commit_super(struct btrfs_root *root);
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/*
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* btrfs_end_io_wq structs are used to do processing in task context when an IO
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* is complete. This is used during reads to verify checksums, and it is used
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* by writes to insert metadata for new file extents after IO is complete.
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*/
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struct btrfs_end_io_wq {
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struct bio *bio;
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bio_end_io_t *end_io;
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void *private;
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struct btrfs_fs_info *info;
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int error;
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enum btrfs_wq_endio_type metadata;
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struct list_head list;
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struct btrfs_work work;
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};
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static struct kmem_cache *btrfs_end_io_wq_cache;
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int __init btrfs_end_io_wq_init(void)
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{
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btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
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sizeof(struct btrfs_end_io_wq),
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0,
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SLAB_MEM_SPREAD,
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NULL);
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if (!btrfs_end_io_wq_cache)
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return -ENOMEM;
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return 0;
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}
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void btrfs_end_io_wq_exit(void)
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{
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kmem_cache_destroy(btrfs_end_io_wq_cache);
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}
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/*
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* async submit bios are used to offload expensive checksumming
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* onto the worker threads. They checksum file and metadata bios
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* just before they are sent down the IO stack.
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*/
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struct async_submit_bio {
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struct inode *inode;
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struct bio *bio;
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struct list_head list;
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extent_submit_bio_hook_t *submit_bio_start;
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extent_submit_bio_hook_t *submit_bio_done;
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int mirror_num;
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unsigned long bio_flags;
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/*
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* bio_offset is optional, can be used if the pages in the bio
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* can't tell us where in the file the bio should go
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*/
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u64 bio_offset;
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struct btrfs_work work;
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int error;
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};
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/*
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* Lockdep class keys for extent_buffer->lock's in this root. For a given
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* eb, the lockdep key is determined by the btrfs_root it belongs to and
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* the level the eb occupies in the tree.
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*
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* Different roots are used for different purposes and may nest inside each
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* other and they require separate keysets. As lockdep keys should be
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* static, assign keysets according to the purpose of the root as indicated
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* by btrfs_root->objectid. This ensures that all special purpose roots
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* have separate keysets.
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*
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* Lock-nesting across peer nodes is always done with the immediate parent
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* node locked thus preventing deadlock. As lockdep doesn't know this, use
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* subclass to avoid triggering lockdep warning in such cases.
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*
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* The key is set by the readpage_end_io_hook after the buffer has passed
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* csum validation but before the pages are unlocked. It is also set by
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* btrfs_init_new_buffer on freshly allocated blocks.
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*
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* We also add a check to make sure the highest level of the tree is the
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* same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
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* needs update as well.
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*/
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# if BTRFS_MAX_LEVEL != 8
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# error
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# endif
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static struct btrfs_lockdep_keyset {
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u64 id; /* root objectid */
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const char *name_stem; /* lock name stem */
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char names[BTRFS_MAX_LEVEL + 1][20];
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struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
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} btrfs_lockdep_keysets[] = {
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{ .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
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{ .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
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{ .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
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{ .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
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{ .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
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{ .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
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{ .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
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{ .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
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{ .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
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{ .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
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{ .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
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{ .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" },
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{ .id = 0, .name_stem = "tree" },
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};
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void __init btrfs_init_lockdep(void)
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{
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int i, j;
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/* initialize lockdep class names */
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for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
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struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
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for (j = 0; j < ARRAY_SIZE(ks->names); j++)
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snprintf(ks->names[j], sizeof(ks->names[j]),
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"btrfs-%s-%02d", ks->name_stem, j);
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}
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}
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void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
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int level)
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{
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struct btrfs_lockdep_keyset *ks;
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BUG_ON(level >= ARRAY_SIZE(ks->keys));
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/* find the matching keyset, id 0 is the default entry */
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for (ks = btrfs_lockdep_keysets; ks->id; ks++)
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if (ks->id == objectid)
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break;
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lockdep_set_class_and_name(&eb->lock,
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&ks->keys[level], ks->names[level]);
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}
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#endif
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/*
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* extents on the btree inode are pretty simple, there's one extent
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* that covers the entire device
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*/
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static struct extent_map *btree_get_extent(struct inode *inode,
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struct page *page, size_t pg_offset, u64 start, u64 len,
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int create)
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{
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struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
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struct extent_map *em;
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int ret;
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read_lock(&em_tree->lock);
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em = lookup_extent_mapping(em_tree, start, len);
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if (em) {
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em->bdev =
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BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
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read_unlock(&em_tree->lock);
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goto out;
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}
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read_unlock(&em_tree->lock);
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em = alloc_extent_map();
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if (!em) {
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em = ERR_PTR(-ENOMEM);
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goto out;
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}
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em->start = 0;
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em->len = (u64)-1;
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em->block_len = (u64)-1;
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em->block_start = 0;
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em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
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write_lock(&em_tree->lock);
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ret = add_extent_mapping(em_tree, em, 0);
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if (ret == -EEXIST) {
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free_extent_map(em);
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em = lookup_extent_mapping(em_tree, start, len);
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if (!em)
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em = ERR_PTR(-EIO);
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} else if (ret) {
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free_extent_map(em);
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em = ERR_PTR(ret);
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}
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write_unlock(&em_tree->lock);
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out:
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return em;
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}
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u32 btrfs_csum_data(char *data, u32 seed, size_t len)
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{
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return btrfs_crc32c(seed, data, len);
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}
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void btrfs_csum_final(u32 crc, char *result)
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{
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put_unaligned_le32(~crc, result);
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}
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/*
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* compute the csum for a btree block, and either verify it or write it
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* into the csum field of the block.
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*/
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static int csum_tree_block(struct btrfs_fs_info *fs_info,
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struct extent_buffer *buf,
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int verify)
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{
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u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
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char *result = NULL;
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unsigned long len;
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unsigned long cur_len;
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unsigned long offset = BTRFS_CSUM_SIZE;
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char *kaddr;
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unsigned long map_start;
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unsigned long map_len;
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int err;
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u32 crc = ~(u32)0;
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unsigned long inline_result;
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len = buf->len - offset;
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while (len > 0) {
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err = map_private_extent_buffer(buf, offset, 32,
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&kaddr, &map_start, &map_len);
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if (err)
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return err;
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cur_len = min(len, map_len - (offset - map_start));
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crc = btrfs_csum_data(kaddr + offset - map_start,
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crc, cur_len);
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len -= cur_len;
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offset += cur_len;
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}
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if (csum_size > sizeof(inline_result)) {
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result = kzalloc(csum_size, GFP_NOFS);
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if (!result)
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return -ENOMEM;
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} else {
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result = (char *)&inline_result;
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}
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btrfs_csum_final(crc, result);
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if (verify) {
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if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
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u32 val;
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u32 found = 0;
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memcpy(&found, result, csum_size);
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read_extent_buffer(buf, &val, 0, csum_size);
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btrfs_warn_rl(fs_info,
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"%s checksum verify failed on %llu wanted %X found %X level %d",
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fs_info->sb->s_id, buf->start,
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val, found, btrfs_header_level(buf));
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if (result != (char *)&inline_result)
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kfree(result);
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return -EUCLEAN;
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}
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} else {
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write_extent_buffer(buf, result, 0, csum_size);
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}
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if (result != (char *)&inline_result)
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kfree(result);
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return 0;
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}
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|
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/*
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* we can't consider a given block up to date unless the transid of the
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* block matches the transid in the parent node's pointer. This is how we
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* detect blocks that either didn't get written at all or got written
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* in the wrong place.
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*/
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static int verify_parent_transid(struct extent_io_tree *io_tree,
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struct extent_buffer *eb, u64 parent_transid,
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int atomic)
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{
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struct extent_state *cached_state = NULL;
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int ret;
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bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
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if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
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return 0;
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if (atomic)
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return -EAGAIN;
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|
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if (need_lock) {
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btrfs_tree_read_lock(eb);
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btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
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}
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lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
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&cached_state);
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if (extent_buffer_uptodate(eb) &&
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btrfs_header_generation(eb) == parent_transid) {
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ret = 0;
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goto out;
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}
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btrfs_err_rl(eb->fs_info,
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"parent transid verify failed on %llu wanted %llu found %llu",
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eb->start,
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parent_transid, btrfs_header_generation(eb));
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ret = 1;
|
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/*
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* Things reading via commit roots that don't have normal protection,
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* like send, can have a really old block in cache that may point at a
|
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* block that has been freed and re-allocated. So don't clear uptodate
|
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* if we find an eb that is under IO (dirty/writeback) because we could
|
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* end up reading in the stale data and then writing it back out and
|
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* making everybody very sad.
|
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*/
|
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if (!extent_buffer_under_io(eb))
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clear_extent_buffer_uptodate(eb);
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out:
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unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
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&cached_state, GFP_NOFS);
|
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if (need_lock)
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btrfs_tree_read_unlock_blocking(eb);
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return ret;
|
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}
|
|
|
|
/*
|
|
* Return 0 if the superblock checksum type matches the checksum value of that
|
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* algorithm. Pass the raw disk superblock data.
|
|
*/
|
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static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
|
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char *raw_disk_sb)
|
|
{
|
|
struct btrfs_super_block *disk_sb =
|
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(struct btrfs_super_block *)raw_disk_sb;
|
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u16 csum_type = btrfs_super_csum_type(disk_sb);
|
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int ret = 0;
|
|
|
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if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
|
|
u32 crc = ~(u32)0;
|
|
const int csum_size = sizeof(crc);
|
|
char result[csum_size];
|
|
|
|
/*
|
|
* The super_block structure does not span the whole
|
|
* BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
|
|
* is filled with zeros and is included in the checksum.
|
|
*/
|
|
crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
|
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crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
|
|
btrfs_csum_final(crc, result);
|
|
|
|
if (memcmp(raw_disk_sb, result, csum_size))
|
|
ret = 1;
|
|
}
|
|
|
|
if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
|
|
btrfs_err(fs_info, "unsupported checksum algorithm %u",
|
|
csum_type);
|
|
ret = 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* helper to read a given tree block, doing retries as required when
|
|
* the checksums don't match and we have alternate mirrors to try.
|
|
*/
|
|
static int btree_read_extent_buffer_pages(struct btrfs_root *root,
|
|
struct extent_buffer *eb,
|
|
u64 parent_transid)
|
|
{
|
|
struct extent_io_tree *io_tree;
|
|
int failed = 0;
|
|
int ret;
|
|
int num_copies = 0;
|
|
int mirror_num = 0;
|
|
int failed_mirror = 0;
|
|
|
|
clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
|
|
io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
|
|
while (1) {
|
|
ret = read_extent_buffer_pages(io_tree, eb, WAIT_COMPLETE,
|
|
btree_get_extent, mirror_num);
|
|
if (!ret) {
|
|
if (!verify_parent_transid(io_tree, eb,
|
|
parent_transid, 0))
|
|
break;
|
|
else
|
|
ret = -EIO;
|
|
}
|
|
|
|
/*
|
|
* This buffer's crc is fine, but its contents are corrupted, so
|
|
* there is no reason to read the other copies, they won't be
|
|
* any less wrong.
|
|
*/
|
|
if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags))
|
|
break;
|
|
|
|
num_copies = btrfs_num_copies(root->fs_info,
|
|
eb->start, eb->len);
|
|
if (num_copies == 1)
|
|
break;
|
|
|
|
if (!failed_mirror) {
|
|
failed = 1;
|
|
failed_mirror = eb->read_mirror;
|
|
}
|
|
|
|
mirror_num++;
|
|
if (mirror_num == failed_mirror)
|
|
mirror_num++;
|
|
|
|
if (mirror_num > num_copies)
|
|
break;
|
|
}
|
|
|
|
if (failed && !ret && failed_mirror)
|
|
repair_eb_io_failure(root, eb, failed_mirror);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* checksum a dirty tree block before IO. This has extra checks to make sure
|
|
* we only fill in the checksum field in the first page of a multi-page block
|
|
*/
|
|
|
|
static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
|
|
{
|
|
u64 start = page_offset(page);
|
|
u64 found_start;
|
|
struct extent_buffer *eb;
|
|
|
|
eb = (struct extent_buffer *)page->private;
|
|
if (page != eb->pages[0])
|
|
return 0;
|
|
|
|
found_start = btrfs_header_bytenr(eb);
|
|
/*
|
|
* Please do not consolidate these warnings into a single if.
|
|
* It is useful to know what went wrong.
|
|
*/
|
|
if (WARN_ON(found_start != start))
|
|
return -EUCLEAN;
|
|
if (WARN_ON(!PageUptodate(page)))
|
|
return -EUCLEAN;
|
|
|
|
ASSERT(memcmp_extent_buffer(eb, fs_info->fsid,
|
|
btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
|
|
|
|
return csum_tree_block(fs_info, eb, 0);
|
|
}
|
|
|
|
static int check_tree_block_fsid(struct btrfs_fs_info *fs_info,
|
|
struct extent_buffer *eb)
|
|
{
|
|
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
|
|
u8 fsid[BTRFS_UUID_SIZE];
|
|
int ret = 1;
|
|
|
|
read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
|
|
while (fs_devices) {
|
|
if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
fs_devices = fs_devices->seed;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#define CORRUPT(reason, eb, root, slot) \
|
|
btrfs_crit(root->fs_info, "corrupt %s, %s: block=%llu," \
|
|
" root=%llu, slot=%d", \
|
|
btrfs_header_level(eb) == 0 ? "leaf" : "node",\
|
|
reason, btrfs_header_bytenr(eb), root->objectid, slot)
|
|
|
|
static noinline int check_leaf(struct btrfs_root *root,
|
|
struct extent_buffer *leaf)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_key leaf_key;
|
|
u32 nritems = btrfs_header_nritems(leaf);
|
|
int slot;
|
|
|
|
if (nritems == 0) {
|
|
struct btrfs_root *check_root;
|
|
|
|
key.objectid = btrfs_header_owner(leaf);
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
check_root = btrfs_get_fs_root(root->fs_info, &key, false);
|
|
/*
|
|
* The only reason we also check NULL here is that during
|
|
* open_ctree() some roots has not yet been set up.
|
|
*/
|
|
if (!IS_ERR_OR_NULL(check_root)) {
|
|
/* if leaf is the root, then it's fine */
|
|
if (leaf->start !=
|
|
btrfs_root_bytenr(&check_root->root_item)) {
|
|
CORRUPT("non-root leaf's nritems is 0",
|
|
leaf, root, 0);
|
|
return -EIO;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Check the 0 item */
|
|
if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) !=
|
|
BTRFS_LEAF_DATA_SIZE(root)) {
|
|
CORRUPT("invalid item offset size pair", leaf, root, 0);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Check to make sure each items keys are in the correct order and their
|
|
* offsets make sense. We only have to loop through nritems-1 because
|
|
* we check the current slot against the next slot, which verifies the
|
|
* next slot's offset+size makes sense and that the current's slot
|
|
* offset is correct.
|
|
*/
|
|
for (slot = 0; slot < nritems - 1; slot++) {
|
|
btrfs_item_key_to_cpu(leaf, &leaf_key, slot);
|
|
btrfs_item_key_to_cpu(leaf, &key, slot + 1);
|
|
|
|
/* Make sure the keys are in the right order */
|
|
if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) {
|
|
CORRUPT("bad key order", leaf, root, slot);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Make sure the offset and ends are right, remember that the
|
|
* item data starts at the end of the leaf and grows towards the
|
|
* front.
|
|
*/
|
|
if (btrfs_item_offset_nr(leaf, slot) !=
|
|
btrfs_item_end_nr(leaf, slot + 1)) {
|
|
CORRUPT("slot offset bad", leaf, root, slot);
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Check to make sure that we don't point outside of the leaf,
|
|
* just in case all the items are consistent to each other, but
|
|
* all point outside of the leaf.
|
|
*/
|
|
if (btrfs_item_end_nr(leaf, slot) >
|
|
BTRFS_LEAF_DATA_SIZE(root)) {
|
|
CORRUPT("slot end outside of leaf", leaf, root, slot);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int check_node(struct btrfs_root *root, struct extent_buffer *node)
|
|
{
|
|
unsigned long nr = btrfs_header_nritems(node);
|
|
struct btrfs_key key, next_key;
|
|
int slot;
|
|
u64 bytenr;
|
|
int ret = 0;
|
|
|
|
if (nr == 0 || nr > BTRFS_NODEPTRS_PER_BLOCK(root)) {
|
|
btrfs_crit(root->fs_info,
|
|
"corrupt node: block %llu root %llu nritems %lu",
|
|
node->start, root->objectid, nr);
|
|
return -EIO;
|
|
}
|
|
|
|
for (slot = 0; slot < nr - 1; slot++) {
|
|
bytenr = btrfs_node_blockptr(node, slot);
|
|
btrfs_node_key_to_cpu(node, &key, slot);
|
|
btrfs_node_key_to_cpu(node, &next_key, slot + 1);
|
|
|
|
if (!bytenr) {
|
|
CORRUPT("invalid item slot", node, root, slot);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
if (btrfs_comp_cpu_keys(&key, &next_key) >= 0) {
|
|
CORRUPT("bad key order", node, root, slot);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
|
|
u64 phy_offset, struct page *page,
|
|
u64 start, u64 end, int mirror)
|
|
{
|
|
u64 found_start;
|
|
int found_level;
|
|
struct extent_buffer *eb;
|
|
struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret = 0;
|
|
int reads_done;
|
|
|
|
if (!page->private)
|
|
goto out;
|
|
|
|
eb = (struct extent_buffer *)page->private;
|
|
|
|
/* the pending IO might have been the only thing that kept this buffer
|
|
* in memory. Make sure we have a ref for all this other checks
|
|
*/
|
|
extent_buffer_get(eb);
|
|
|
|
reads_done = atomic_dec_and_test(&eb->io_pages);
|
|
if (!reads_done)
|
|
goto err;
|
|
|
|
eb->read_mirror = mirror;
|
|
if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
found_start = btrfs_header_bytenr(eb);
|
|
if (found_start != eb->start) {
|
|
btrfs_err_rl(fs_info, "bad tree block start %llu %llu",
|
|
found_start, eb->start);
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
if (check_tree_block_fsid(fs_info, eb)) {
|
|
btrfs_err_rl(fs_info, "bad fsid on block %llu",
|
|
eb->start);
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
found_level = btrfs_header_level(eb);
|
|
if (found_level >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "bad tree block level %d",
|
|
(int)btrfs_header_level(eb));
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
|
|
btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
|
|
eb, found_level);
|
|
|
|
ret = csum_tree_block(fs_info, eb, 1);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/*
|
|
* If this is a leaf block and it is corrupt, set the corrupt bit so
|
|
* that we don't try and read the other copies of this block, just
|
|
* return -EIO.
|
|
*/
|
|
if (found_level == 0 && check_leaf(root, eb)) {
|
|
set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
|
|
ret = -EIO;
|
|
}
|
|
|
|
if (found_level > 0 && check_node(root, eb))
|
|
ret = -EIO;
|
|
|
|
if (!ret)
|
|
set_extent_buffer_uptodate(eb);
|
|
err:
|
|
if (reads_done &&
|
|
test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
|
|
btree_readahead_hook(fs_info, eb, eb->start, ret);
|
|
|
|
if (ret) {
|
|
/*
|
|
* our io error hook is going to dec the io pages
|
|
* again, we have to make sure it has something
|
|
* to decrement
|
|
*/
|
|
atomic_inc(&eb->io_pages);
|
|
clear_extent_buffer_uptodate(eb);
|
|
}
|
|
free_extent_buffer(eb);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int btree_io_failed_hook(struct page *page, int failed_mirror)
|
|
{
|
|
struct extent_buffer *eb;
|
|
|
|
eb = (struct extent_buffer *)page->private;
|
|
set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
|
|
eb->read_mirror = failed_mirror;
|
|
atomic_dec(&eb->io_pages);
|
|
if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
|
|
btree_readahead_hook(eb->fs_info, eb, eb->start, -EIO);
|
|
return -EIO; /* we fixed nothing */
|
|
}
|
|
|
|
static void end_workqueue_bio(struct bio *bio)
|
|
{
|
|
struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_workqueue *wq;
|
|
btrfs_work_func_t func;
|
|
|
|
fs_info = end_io_wq->info;
|
|
end_io_wq->error = bio->bi_error;
|
|
|
|
if (bio_op(bio) == REQ_OP_WRITE) {
|
|
if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
|
|
wq = fs_info->endio_meta_write_workers;
|
|
func = btrfs_endio_meta_write_helper;
|
|
} else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
|
|
wq = fs_info->endio_freespace_worker;
|
|
func = btrfs_freespace_write_helper;
|
|
} else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
|
|
wq = fs_info->endio_raid56_workers;
|
|
func = btrfs_endio_raid56_helper;
|
|
} else {
|
|
wq = fs_info->endio_write_workers;
|
|
func = btrfs_endio_write_helper;
|
|
}
|
|
} else {
|
|
if (unlikely(end_io_wq->metadata ==
|
|
BTRFS_WQ_ENDIO_DIO_REPAIR)) {
|
|
wq = fs_info->endio_repair_workers;
|
|
func = btrfs_endio_repair_helper;
|
|
} else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
|
|
wq = fs_info->endio_raid56_workers;
|
|
func = btrfs_endio_raid56_helper;
|
|
} else if (end_io_wq->metadata) {
|
|
wq = fs_info->endio_meta_workers;
|
|
func = btrfs_endio_meta_helper;
|
|
} else {
|
|
wq = fs_info->endio_workers;
|
|
func = btrfs_endio_helper;
|
|
}
|
|
}
|
|
|
|
btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
|
|
btrfs_queue_work(wq, &end_io_wq->work);
|
|
}
|
|
|
|
int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
|
|
enum btrfs_wq_endio_type metadata)
|
|
{
|
|
struct btrfs_end_io_wq *end_io_wq;
|
|
|
|
end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
|
|
if (!end_io_wq)
|
|
return -ENOMEM;
|
|
|
|
end_io_wq->private = bio->bi_private;
|
|
end_io_wq->end_io = bio->bi_end_io;
|
|
end_io_wq->info = info;
|
|
end_io_wq->error = 0;
|
|
end_io_wq->bio = bio;
|
|
end_io_wq->metadata = metadata;
|
|
|
|
bio->bi_private = end_io_wq;
|
|
bio->bi_end_io = end_workqueue_bio;
|
|
return 0;
|
|
}
|
|
|
|
unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
|
|
{
|
|
unsigned long limit = min_t(unsigned long,
|
|
info->thread_pool_size,
|
|
info->fs_devices->open_devices);
|
|
return 256 * limit;
|
|
}
|
|
|
|
static void run_one_async_start(struct btrfs_work *work)
|
|
{
|
|
struct async_submit_bio *async;
|
|
int ret;
|
|
|
|
async = container_of(work, struct async_submit_bio, work);
|
|
ret = async->submit_bio_start(async->inode, async->bio,
|
|
async->mirror_num, async->bio_flags,
|
|
async->bio_offset);
|
|
if (ret)
|
|
async->error = ret;
|
|
}
|
|
|
|
static void run_one_async_done(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
struct async_submit_bio *async;
|
|
int limit;
|
|
|
|
async = container_of(work, struct async_submit_bio, work);
|
|
fs_info = BTRFS_I(async->inode)->root->fs_info;
|
|
|
|
limit = btrfs_async_submit_limit(fs_info);
|
|
limit = limit * 2 / 3;
|
|
|
|
/*
|
|
* atomic_dec_return implies a barrier for waitqueue_active
|
|
*/
|
|
if (atomic_dec_return(&fs_info->nr_async_submits) < limit &&
|
|
waitqueue_active(&fs_info->async_submit_wait))
|
|
wake_up(&fs_info->async_submit_wait);
|
|
|
|
/* If an error occurred we just want to clean up the bio and move on */
|
|
if (async->error) {
|
|
async->bio->bi_error = async->error;
|
|
bio_endio(async->bio);
|
|
return;
|
|
}
|
|
|
|
async->submit_bio_done(async->inode, async->bio, async->mirror_num,
|
|
async->bio_flags, async->bio_offset);
|
|
}
|
|
|
|
static void run_one_async_free(struct btrfs_work *work)
|
|
{
|
|
struct async_submit_bio *async;
|
|
|
|
async = container_of(work, struct async_submit_bio, work);
|
|
kfree(async);
|
|
}
|
|
|
|
int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
|
|
struct bio *bio, int mirror_num,
|
|
unsigned long bio_flags,
|
|
u64 bio_offset,
|
|
extent_submit_bio_hook_t *submit_bio_start,
|
|
extent_submit_bio_hook_t *submit_bio_done)
|
|
{
|
|
struct async_submit_bio *async;
|
|
|
|
async = kmalloc(sizeof(*async), GFP_NOFS);
|
|
if (!async)
|
|
return -ENOMEM;
|
|
|
|
async->inode = inode;
|
|
async->bio = bio;
|
|
async->mirror_num = mirror_num;
|
|
async->submit_bio_start = submit_bio_start;
|
|
async->submit_bio_done = submit_bio_done;
|
|
|
|
btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
|
|
run_one_async_done, run_one_async_free);
|
|
|
|
async->bio_flags = bio_flags;
|
|
async->bio_offset = bio_offset;
|
|
|
|
async->error = 0;
|
|
|
|
atomic_inc(&fs_info->nr_async_submits);
|
|
|
|
if (bio->bi_opf & REQ_SYNC)
|
|
btrfs_set_work_high_priority(&async->work);
|
|
|
|
btrfs_queue_work(fs_info->workers, &async->work);
|
|
|
|
while (atomic_read(&fs_info->async_submit_draining) &&
|
|
atomic_read(&fs_info->nr_async_submits)) {
|
|
wait_event(fs_info->async_submit_wait,
|
|
(atomic_read(&fs_info->nr_async_submits) == 0));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btree_csum_one_bio(struct bio *bio)
|
|
{
|
|
struct bio_vec *bvec;
|
|
struct btrfs_root *root;
|
|
int i, ret = 0;
|
|
|
|
bio_for_each_segment_all(bvec, bio, i) {
|
|
root = BTRFS_I(bvec->bv_page->mapping->host)->root;
|
|
ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __btree_submit_bio_start(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset)
|
|
{
|
|
/*
|
|
* when we're called for a write, we're already in the async
|
|
* submission context. Just jump into btrfs_map_bio
|
|
*/
|
|
return btree_csum_one_bio(bio);
|
|
}
|
|
|
|
static int __btree_submit_bio_done(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset)
|
|
{
|
|
int ret;
|
|
|
|
/*
|
|
* when we're called for a write, we're already in the async
|
|
* submission context. Just jump into btrfs_map_bio
|
|
*/
|
|
ret = btrfs_map_bio(BTRFS_I(inode)->root, bio, mirror_num, 1);
|
|
if (ret) {
|
|
bio->bi_error = ret;
|
|
bio_endio(bio);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int check_async_write(struct inode *inode, unsigned long bio_flags)
|
|
{
|
|
if (bio_flags & EXTENT_BIO_TREE_LOG)
|
|
return 0;
|
|
#ifdef CONFIG_X86
|
|
if (static_cpu_has(X86_FEATURE_XMM4_2))
|
|
return 0;
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
static int btree_submit_bio_hook(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 bio_offset)
|
|
{
|
|
int async = check_async_write(inode, bio_flags);
|
|
int ret;
|
|
|
|
if (bio_op(bio) != REQ_OP_WRITE) {
|
|
/*
|
|
* called for a read, do the setup so that checksum validation
|
|
* can happen in the async kernel threads
|
|
*/
|
|
ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
|
|
bio, BTRFS_WQ_ENDIO_METADATA);
|
|
if (ret)
|
|
goto out_w_error;
|
|
ret = btrfs_map_bio(BTRFS_I(inode)->root, bio, mirror_num, 0);
|
|
} else if (!async) {
|
|
ret = btree_csum_one_bio(bio);
|
|
if (ret)
|
|
goto out_w_error;
|
|
ret = btrfs_map_bio(BTRFS_I(inode)->root, bio, mirror_num, 0);
|
|
} else {
|
|
/*
|
|
* kthread helpers are used to submit writes so that
|
|
* checksumming can happen in parallel across all CPUs
|
|
*/
|
|
ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
|
|
inode, bio, mirror_num, 0,
|
|
bio_offset,
|
|
__btree_submit_bio_start,
|
|
__btree_submit_bio_done);
|
|
}
|
|
|
|
if (ret)
|
|
goto out_w_error;
|
|
return 0;
|
|
|
|
out_w_error:
|
|
bio->bi_error = ret;
|
|
bio_endio(bio);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
static int btree_migratepage(struct address_space *mapping,
|
|
struct page *newpage, struct page *page,
|
|
enum migrate_mode mode)
|
|
{
|
|
/*
|
|
* we can't safely write a btree page from here,
|
|
* we haven't done the locking hook
|
|
*/
|
|
if (PageDirty(page))
|
|
return -EAGAIN;
|
|
/*
|
|
* Buffers may be managed in a filesystem specific way.
|
|
* We must have no buffers or drop them.
|
|
*/
|
|
if (page_has_private(page) &&
|
|
!try_to_release_page(page, GFP_KERNEL))
|
|
return -EAGAIN;
|
|
return migrate_page(mapping, newpage, page, mode);
|
|
}
|
|
#endif
|
|
|
|
|
|
static int btree_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
int ret;
|
|
|
|
if (wbc->sync_mode == WB_SYNC_NONE) {
|
|
|
|
if (wbc->for_kupdate)
|
|
return 0;
|
|
|
|
fs_info = BTRFS_I(mapping->host)->root->fs_info;
|
|
/* this is a bit racy, but that's ok */
|
|
ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes,
|
|
BTRFS_DIRTY_METADATA_THRESH);
|
|
if (ret < 0)
|
|
return 0;
|
|
}
|
|
return btree_write_cache_pages(mapping, wbc);
|
|
}
|
|
|
|
static int btree_readpage(struct file *file, struct page *page)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
return extent_read_full_page(tree, page, btree_get_extent, 0);
|
|
}
|
|
|
|
static int btree_releasepage(struct page *page, gfp_t gfp_flags)
|
|
{
|
|
if (PageWriteback(page) || PageDirty(page))
|
|
return 0;
|
|
|
|
return try_release_extent_buffer(page);
|
|
}
|
|
|
|
static void btree_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
extent_invalidatepage(tree, page, offset);
|
|
btree_releasepage(page, GFP_NOFS);
|
|
if (PagePrivate(page)) {
|
|
btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
|
|
"page private not zero on page %llu",
|
|
(unsigned long long)page_offset(page));
|
|
ClearPagePrivate(page);
|
|
set_page_private(page, 0);
|
|
put_page(page);
|
|
}
|
|
}
|
|
|
|
static int btree_set_page_dirty(struct page *page)
|
|
{
|
|
#ifdef DEBUG
|
|
struct extent_buffer *eb;
|
|
|
|
BUG_ON(!PagePrivate(page));
|
|
eb = (struct extent_buffer *)page->private;
|
|
BUG_ON(!eb);
|
|
BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
|
|
BUG_ON(!atomic_read(&eb->refs));
|
|
btrfs_assert_tree_locked(eb);
|
|
#endif
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
|
|
static const struct address_space_operations btree_aops = {
|
|
.readpage = btree_readpage,
|
|
.writepages = btree_writepages,
|
|
.releasepage = btree_releasepage,
|
|
.invalidatepage = btree_invalidatepage,
|
|
#ifdef CONFIG_MIGRATION
|
|
.migratepage = btree_migratepage,
|
|
#endif
|
|
.set_page_dirty = btree_set_page_dirty,
|
|
};
|
|
|
|
void readahead_tree_block(struct btrfs_root *root, u64 bytenr)
|
|
{
|
|
struct extent_buffer *buf = NULL;
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
|
|
|
buf = btrfs_find_create_tree_block(root, bytenr);
|
|
if (IS_ERR(buf))
|
|
return;
|
|
read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
|
|
buf, WAIT_NONE, btree_get_extent, 0);
|
|
free_extent_buffer(buf);
|
|
}
|
|
|
|
int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr,
|
|
int mirror_num, struct extent_buffer **eb)
|
|
{
|
|
struct extent_buffer *buf = NULL;
|
|
struct inode *btree_inode = root->fs_info->btree_inode;
|
|
struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree;
|
|
int ret;
|
|
|
|
buf = btrfs_find_create_tree_block(root, bytenr);
|
|
if (IS_ERR(buf))
|
|
return 0;
|
|
|
|
set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
|
|
|
|
ret = read_extent_buffer_pages(io_tree, buf, WAIT_PAGE_LOCK,
|
|
btree_get_extent, mirror_num);
|
|
if (ret) {
|
|
free_extent_buffer(buf);
|
|
return ret;
|
|
}
|
|
|
|
if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
|
|
free_extent_buffer(buf);
|
|
return -EIO;
|
|
} else if (extent_buffer_uptodate(buf)) {
|
|
*eb = buf;
|
|
} else {
|
|
free_extent_buffer(buf);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
|
|
u64 bytenr)
|
|
{
|
|
return find_extent_buffer(fs_info, bytenr);
|
|
}
|
|
|
|
struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
|
|
u64 bytenr)
|
|
{
|
|
if (btrfs_is_testing(root->fs_info))
|
|
return alloc_test_extent_buffer(root->fs_info, bytenr,
|
|
root->nodesize);
|
|
return alloc_extent_buffer(root->fs_info, bytenr);
|
|
}
|
|
|
|
|
|
int btrfs_write_tree_block(struct extent_buffer *buf)
|
|
{
|
|
return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
|
|
buf->start + buf->len - 1);
|
|
}
|
|
|
|
int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
|
|
{
|
|
return filemap_fdatawait_range(buf->pages[0]->mapping,
|
|
buf->start, buf->start + buf->len - 1);
|
|
}
|
|
|
|
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
|
|
u64 parent_transid)
|
|
{
|
|
struct extent_buffer *buf = NULL;
|
|
int ret;
|
|
|
|
buf = btrfs_find_create_tree_block(root, bytenr);
|
|
if (IS_ERR(buf))
|
|
return buf;
|
|
|
|
ret = btree_read_extent_buffer_pages(root, buf, parent_transid);
|
|
if (ret) {
|
|
free_extent_buffer(buf);
|
|
return ERR_PTR(ret);
|
|
}
|
|
return buf;
|
|
|
|
}
|
|
|
|
void clean_tree_block(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
struct extent_buffer *buf)
|
|
{
|
|
if (btrfs_header_generation(buf) ==
|
|
fs_info->running_transaction->transid) {
|
|
btrfs_assert_tree_locked(buf);
|
|
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
|
|
__percpu_counter_add(&fs_info->dirty_metadata_bytes,
|
|
-buf->len,
|
|
fs_info->dirty_metadata_batch);
|
|
/* ugh, clear_extent_buffer_dirty needs to lock the page */
|
|
btrfs_set_lock_blocking(buf);
|
|
clear_extent_buffer_dirty(buf);
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
|
|
{
|
|
struct btrfs_subvolume_writers *writers;
|
|
int ret;
|
|
|
|
writers = kmalloc(sizeof(*writers), GFP_NOFS);
|
|
if (!writers)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = percpu_counter_init(&writers->counter, 0, GFP_KERNEL);
|
|
if (ret < 0) {
|
|
kfree(writers);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
init_waitqueue_head(&writers->wait);
|
|
return writers;
|
|
}
|
|
|
|
static void
|
|
btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
|
|
{
|
|
percpu_counter_destroy(&writers->counter);
|
|
kfree(writers);
|
|
}
|
|
|
|
static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize,
|
|
struct btrfs_root *root, struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
|
|
root->node = NULL;
|
|
root->commit_root = NULL;
|
|
root->sectorsize = sectorsize;
|
|
root->nodesize = nodesize;
|
|
root->stripesize = stripesize;
|
|
root->state = 0;
|
|
root->orphan_cleanup_state = 0;
|
|
|
|
root->objectid = objectid;
|
|
root->last_trans = 0;
|
|
root->highest_objectid = 0;
|
|
root->nr_delalloc_inodes = 0;
|
|
root->nr_ordered_extents = 0;
|
|
root->name = NULL;
|
|
root->inode_tree = RB_ROOT;
|
|
INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
|
|
root->block_rsv = NULL;
|
|
root->orphan_block_rsv = NULL;
|
|
|
|
INIT_LIST_HEAD(&root->dirty_list);
|
|
INIT_LIST_HEAD(&root->root_list);
|
|
INIT_LIST_HEAD(&root->delalloc_inodes);
|
|
INIT_LIST_HEAD(&root->delalloc_root);
|
|
INIT_LIST_HEAD(&root->ordered_extents);
|
|
INIT_LIST_HEAD(&root->ordered_root);
|
|
INIT_LIST_HEAD(&root->logged_list[0]);
|
|
INIT_LIST_HEAD(&root->logged_list[1]);
|
|
spin_lock_init(&root->orphan_lock);
|
|
spin_lock_init(&root->inode_lock);
|
|
spin_lock_init(&root->delalloc_lock);
|
|
spin_lock_init(&root->ordered_extent_lock);
|
|
spin_lock_init(&root->accounting_lock);
|
|
spin_lock_init(&root->log_extents_lock[0]);
|
|
spin_lock_init(&root->log_extents_lock[1]);
|
|
mutex_init(&root->objectid_mutex);
|
|
mutex_init(&root->log_mutex);
|
|
mutex_init(&root->ordered_extent_mutex);
|
|
mutex_init(&root->delalloc_mutex);
|
|
init_waitqueue_head(&root->log_writer_wait);
|
|
init_waitqueue_head(&root->log_commit_wait[0]);
|
|
init_waitqueue_head(&root->log_commit_wait[1]);
|
|
INIT_LIST_HEAD(&root->log_ctxs[0]);
|
|
INIT_LIST_HEAD(&root->log_ctxs[1]);
|
|
atomic_set(&root->log_commit[0], 0);
|
|
atomic_set(&root->log_commit[1], 0);
|
|
atomic_set(&root->log_writers, 0);
|
|
atomic_set(&root->log_batch, 0);
|
|
atomic_set(&root->orphan_inodes, 0);
|
|
atomic_set(&root->refs, 1);
|
|
atomic_set(&root->will_be_snapshoted, 0);
|
|
atomic_set(&root->qgroup_meta_rsv, 0);
|
|
root->log_transid = 0;
|
|
root->log_transid_committed = -1;
|
|
root->last_log_commit = 0;
|
|
if (!dummy)
|
|
extent_io_tree_init(&root->dirty_log_pages,
|
|
fs_info->btree_inode->i_mapping);
|
|
|
|
memset(&root->root_key, 0, sizeof(root->root_key));
|
|
memset(&root->root_item, 0, sizeof(root->root_item));
|
|
memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
|
|
if (!dummy)
|
|
root->defrag_trans_start = fs_info->generation;
|
|
else
|
|
root->defrag_trans_start = 0;
|
|
root->root_key.objectid = objectid;
|
|
root->anon_dev = 0;
|
|
|
|
spin_lock_init(&root->root_item_lock);
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
|
|
gfp_t flags)
|
|
{
|
|
struct btrfs_root *root = kzalloc(sizeof(*root), flags);
|
|
if (root)
|
|
root->fs_info = fs_info;
|
|
return root;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
/* Should only be used by the testing infrastructure */
|
|
struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info,
|
|
u32 sectorsize, u32 nodesize)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
if (!fs_info)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
root = btrfs_alloc_root(fs_info, GFP_KERNEL);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
/* We don't use the stripesize in selftest, set it as sectorsize */
|
|
__setup_root(nodesize, sectorsize, sectorsize, root, fs_info,
|
|
BTRFS_ROOT_TREE_OBJECTID);
|
|
root->alloc_bytenr = 0;
|
|
|
|
return root;
|
|
}
|
|
#endif
|
|
|
|
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
int ret = 0;
|
|
uuid_le uuid;
|
|
|
|
root = btrfs_alloc_root(fs_info, GFP_KERNEL);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
__setup_root(tree_root->nodesize, tree_root->sectorsize,
|
|
tree_root->stripesize, root, fs_info, objectid);
|
|
root->root_key.objectid = objectid;
|
|
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root->root_key.offset = 0;
|
|
|
|
leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
|
|
if (IS_ERR(leaf)) {
|
|
ret = PTR_ERR(leaf);
|
|
leaf = NULL;
|
|
goto fail;
|
|
}
|
|
|
|
memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
|
|
btrfs_set_header_bytenr(leaf, leaf->start);
|
|
btrfs_set_header_generation(leaf, trans->transid);
|
|
btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
|
|
btrfs_set_header_owner(leaf, objectid);
|
|
root->node = leaf;
|
|
|
|
write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(),
|
|
BTRFS_FSID_SIZE);
|
|
write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
|
|
btrfs_header_chunk_tree_uuid(leaf),
|
|
BTRFS_UUID_SIZE);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
root->commit_root = btrfs_root_node(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
|
|
root->root_item.flags = 0;
|
|
root->root_item.byte_limit = 0;
|
|
btrfs_set_root_bytenr(&root->root_item, leaf->start);
|
|
btrfs_set_root_generation(&root->root_item, trans->transid);
|
|
btrfs_set_root_level(&root->root_item, 0);
|
|
btrfs_set_root_refs(&root->root_item, 1);
|
|
btrfs_set_root_used(&root->root_item, leaf->len);
|
|
btrfs_set_root_last_snapshot(&root->root_item, 0);
|
|
btrfs_set_root_dirid(&root->root_item, 0);
|
|
uuid_le_gen(&uuid);
|
|
memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
|
|
root->root_item.drop_level = 0;
|
|
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
btrfs_tree_unlock(leaf);
|
|
|
|
return root;
|
|
|
|
fail:
|
|
if (leaf) {
|
|
btrfs_tree_unlock(leaf);
|
|
free_extent_buffer(root->commit_root);
|
|
free_extent_buffer(leaf);
|
|
}
|
|
kfree(root);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct extent_buffer *leaf;
|
|
|
|
root = btrfs_alloc_root(fs_info, GFP_NOFS);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
__setup_root(tree_root->nodesize, tree_root->sectorsize,
|
|
tree_root->stripesize, root, fs_info,
|
|
BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
|
|
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
|
|
|
|
/*
|
|
* DON'T set REF_COWS for log trees
|
|
*
|
|
* log trees do not get reference counted because they go away
|
|
* before a real commit is actually done. They do store pointers
|
|
* to file data extents, and those reference counts still get
|
|
* updated (along with back refs to the log tree).
|
|
*/
|
|
|
|
leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
|
|
NULL, 0, 0, 0);
|
|
if (IS_ERR(leaf)) {
|
|
kfree(root);
|
|
return ERR_CAST(leaf);
|
|
}
|
|
|
|
memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
|
|
btrfs_set_header_bytenr(leaf, leaf->start);
|
|
btrfs_set_header_generation(leaf, trans->transid);
|
|
btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
|
|
btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
|
|
root->node = leaf;
|
|
|
|
write_extent_buffer(root->node, root->fs_info->fsid,
|
|
btrfs_header_fsid(), BTRFS_FSID_SIZE);
|
|
btrfs_mark_buffer_dirty(root->node);
|
|
btrfs_tree_unlock(root->node);
|
|
return root;
|
|
}
|
|
|
|
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *log_root;
|
|
|
|
log_root = alloc_log_tree(trans, fs_info);
|
|
if (IS_ERR(log_root))
|
|
return PTR_ERR(log_root);
|
|
WARN_ON(fs_info->log_root_tree);
|
|
fs_info->log_root_tree = log_root;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_root *log_root;
|
|
struct btrfs_inode_item *inode_item;
|
|
|
|
log_root = alloc_log_tree(trans, root->fs_info);
|
|
if (IS_ERR(log_root))
|
|
return PTR_ERR(log_root);
|
|
|
|
log_root->last_trans = trans->transid;
|
|
log_root->root_key.offset = root->root_key.objectid;
|
|
|
|
inode_item = &log_root->root_item.inode;
|
|
btrfs_set_stack_inode_generation(inode_item, 1);
|
|
btrfs_set_stack_inode_size(inode_item, 3);
|
|
btrfs_set_stack_inode_nlink(inode_item, 1);
|
|
btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
|
|
btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
|
|
|
|
btrfs_set_root_node(&log_root->root_item, log_root->node);
|
|
|
|
WARN_ON(root->log_root);
|
|
root->log_root = log_root;
|
|
root->log_transid = 0;
|
|
root->log_transid_committed = -1;
|
|
root->last_log_commit = 0;
|
|
return 0;
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_fs_info *fs_info = tree_root->fs_info;
|
|
struct btrfs_path *path;
|
|
u64 generation;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
root = btrfs_alloc_root(fs_info, GFP_NOFS);
|
|
if (!root) {
|
|
ret = -ENOMEM;
|
|
goto alloc_fail;
|
|
}
|
|
|
|
__setup_root(tree_root->nodesize, tree_root->sectorsize,
|
|
tree_root->stripesize, root, fs_info, key->objectid);
|
|
|
|
ret = btrfs_find_root(tree_root, key, path,
|
|
&root->root_item, &root->root_key);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto find_fail;
|
|
}
|
|
|
|
generation = btrfs_root_generation(&root->root_item);
|
|
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
|
|
generation);
|
|
if (IS_ERR(root->node)) {
|
|
ret = PTR_ERR(root->node);
|
|
goto find_fail;
|
|
} else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
|
|
ret = -EIO;
|
|
free_extent_buffer(root->node);
|
|
goto find_fail;
|
|
}
|
|
root->commit_root = btrfs_root_node(root);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return root;
|
|
|
|
find_fail:
|
|
kfree(root);
|
|
alloc_fail:
|
|
root = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
|
|
struct btrfs_key *location)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
root = btrfs_read_tree_root(tree_root, location);
|
|
if (IS_ERR(root))
|
|
return root;
|
|
|
|
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
|
|
set_bit(BTRFS_ROOT_REF_COWS, &root->state);
|
|
btrfs_check_and_init_root_item(&root->root_item);
|
|
}
|
|
|
|
return root;
|
|
}
|
|
|
|
int btrfs_init_fs_root(struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
struct btrfs_subvolume_writers *writers;
|
|
|
|
root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
|
|
root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
|
|
GFP_NOFS);
|
|
if (!root->free_ino_pinned || !root->free_ino_ctl) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
writers = btrfs_alloc_subvolume_writers();
|
|
if (IS_ERR(writers)) {
|
|
ret = PTR_ERR(writers);
|
|
goto fail;
|
|
}
|
|
root->subv_writers = writers;
|
|
|
|
btrfs_init_free_ino_ctl(root);
|
|
spin_lock_init(&root->ino_cache_lock);
|
|
init_waitqueue_head(&root->ino_cache_wait);
|
|
|
|
ret = get_anon_bdev(&root->anon_dev);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
mutex_lock(&root->objectid_mutex);
|
|
ret = btrfs_find_highest_objectid(root,
|
|
&root->highest_objectid);
|
|
if (ret) {
|
|
mutex_unlock(&root->objectid_mutex);
|
|
goto fail;
|
|
}
|
|
|
|
ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
|
|
|
|
mutex_unlock(&root->objectid_mutex);
|
|
|
|
return 0;
|
|
fail:
|
|
/* the caller is responsible to call free_fs_root */
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 root_id)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
root = radix_tree_lookup(&fs_info->fs_roots_radix,
|
|
(unsigned long)root_id);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
return root;
|
|
}
|
|
|
|
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
|
|
ret = radix_tree_preload(GFP_NOFS);
|
|
if (ret)
|
|
return ret;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
ret = radix_tree_insert(&fs_info->fs_roots_radix,
|
|
(unsigned long)root->root_key.objectid,
|
|
root);
|
|
if (ret == 0)
|
|
set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
radix_tree_preload_end();
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *location,
|
|
bool check_ref)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
|
|
return fs_info->tree_root;
|
|
if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
|
|
return fs_info->extent_root;
|
|
if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
|
|
return fs_info->chunk_root;
|
|
if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
|
|
return fs_info->dev_root;
|
|
if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
|
|
return fs_info->csum_root;
|
|
if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
|
|
return fs_info->quota_root ? fs_info->quota_root :
|
|
ERR_PTR(-ENOENT);
|
|
if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
|
|
return fs_info->uuid_root ? fs_info->uuid_root :
|
|
ERR_PTR(-ENOENT);
|
|
if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
|
|
return fs_info->free_space_root ? fs_info->free_space_root :
|
|
ERR_PTR(-ENOENT);
|
|
again:
|
|
root = btrfs_lookup_fs_root(fs_info, location->objectid);
|
|
if (root) {
|
|
if (check_ref && btrfs_root_refs(&root->root_item) == 0)
|
|
return ERR_PTR(-ENOENT);
|
|
return root;
|
|
}
|
|
|
|
root = btrfs_read_fs_root(fs_info->tree_root, location);
|
|
if (IS_ERR(root))
|
|
return root;
|
|
|
|
if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_init_fs_root(root);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
key.objectid = BTRFS_ORPHAN_OBJECTID;
|
|
key.type = BTRFS_ORPHAN_ITEM_KEY;
|
|
key.offset = location->objectid;
|
|
|
|
ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
|
|
btrfs_free_path(path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret == 0)
|
|
set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
|
|
|
|
ret = btrfs_insert_fs_root(fs_info, root);
|
|
if (ret) {
|
|
if (ret == -EEXIST) {
|
|
free_fs_root(root);
|
|
goto again;
|
|
}
|
|
goto fail;
|
|
}
|
|
return root;
|
|
fail:
|
|
free_fs_root(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static int btrfs_congested_fn(void *congested_data, int bdi_bits)
|
|
{
|
|
struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
|
|
int ret = 0;
|
|
struct btrfs_device *device;
|
|
struct backing_dev_info *bdi;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
|
|
if (!device->bdev)
|
|
continue;
|
|
bdi = blk_get_backing_dev_info(device->bdev);
|
|
if (bdi_congested(bdi, bdi_bits)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
|
|
{
|
|
int err;
|
|
|
|
err = bdi_setup_and_register(bdi, "btrfs");
|
|
if (err)
|
|
return err;
|
|
|
|
bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
|
|
bdi->congested_fn = btrfs_congested_fn;
|
|
bdi->congested_data = info;
|
|
bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* called by the kthread helper functions to finally call the bio end_io
|
|
* functions. This is where read checksum verification actually happens
|
|
*/
|
|
static void end_workqueue_fn(struct btrfs_work *work)
|
|
{
|
|
struct bio *bio;
|
|
struct btrfs_end_io_wq *end_io_wq;
|
|
|
|
end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
|
|
bio = end_io_wq->bio;
|
|
|
|
bio->bi_error = end_io_wq->error;
|
|
bio->bi_private = end_io_wq->private;
|
|
bio->bi_end_io = end_io_wq->end_io;
|
|
kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
|
|
bio_endio(bio);
|
|
}
|
|
|
|
static int cleaner_kthread(void *arg)
|
|
{
|
|
struct btrfs_root *root = arg;
|
|
int again;
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
do {
|
|
again = 0;
|
|
|
|
/* Make the cleaner go to sleep early. */
|
|
if (btrfs_need_cleaner_sleep(root))
|
|
goto sleep;
|
|
|
|
/*
|
|
* Do not do anything if we might cause open_ctree() to block
|
|
* before we have finished mounting the filesystem.
|
|
*/
|
|
if (!test_bit(BTRFS_FS_OPEN, &root->fs_info->flags))
|
|
goto sleep;
|
|
|
|
if (!mutex_trylock(&root->fs_info->cleaner_mutex))
|
|
goto sleep;
|
|
|
|
/*
|
|
* Avoid the problem that we change the status of the fs
|
|
* during the above check and trylock.
|
|
*/
|
|
if (btrfs_need_cleaner_sleep(root)) {
|
|
mutex_unlock(&root->fs_info->cleaner_mutex);
|
|
goto sleep;
|
|
}
|
|
|
|
mutex_lock(&root->fs_info->cleaner_delayed_iput_mutex);
|
|
btrfs_run_delayed_iputs(root);
|
|
mutex_unlock(&root->fs_info->cleaner_delayed_iput_mutex);
|
|
|
|
again = btrfs_clean_one_deleted_snapshot(root);
|
|
mutex_unlock(&root->fs_info->cleaner_mutex);
|
|
|
|
/*
|
|
* The defragger has dealt with the R/O remount and umount,
|
|
* needn't do anything special here.
|
|
*/
|
|
btrfs_run_defrag_inodes(root->fs_info);
|
|
|
|
/*
|
|
* Acquires fs_info->delete_unused_bgs_mutex to avoid racing
|
|
* with relocation (btrfs_relocate_chunk) and relocation
|
|
* acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
|
|
* after acquiring fs_info->delete_unused_bgs_mutex. So we
|
|
* can't hold, nor need to, fs_info->cleaner_mutex when deleting
|
|
* unused block groups.
|
|
*/
|
|
btrfs_delete_unused_bgs(root->fs_info);
|
|
sleep:
|
|
if (!again) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (!kthread_should_stop())
|
|
schedule();
|
|
__set_current_state(TASK_RUNNING);
|
|
}
|
|
} while (!kthread_should_stop());
|
|
|
|
/*
|
|
* Transaction kthread is stopped before us and wakes us up.
|
|
* However we might have started a new transaction and COWed some
|
|
* tree blocks when deleting unused block groups for example. So
|
|
* make sure we commit the transaction we started to have a clean
|
|
* shutdown when evicting the btree inode - if it has dirty pages
|
|
* when we do the final iput() on it, eviction will trigger a
|
|
* writeback for it which will fail with null pointer dereferences
|
|
* since work queues and other resources were already released and
|
|
* destroyed by the time the iput/eviction/writeback is made.
|
|
*/
|
|
trans = btrfs_attach_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
if (PTR_ERR(trans) != -ENOENT)
|
|
btrfs_err(root->fs_info,
|
|
"cleaner transaction attach returned %ld",
|
|
PTR_ERR(trans));
|
|
} else {
|
|
int ret;
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
if (ret)
|
|
btrfs_err(root->fs_info,
|
|
"cleaner open transaction commit returned %d",
|
|
ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int transaction_kthread(void *arg)
|
|
{
|
|
struct btrfs_root *root = arg;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_transaction *cur;
|
|
u64 transid;
|
|
unsigned long now;
|
|
unsigned long delay;
|
|
bool cannot_commit;
|
|
|
|
do {
|
|
cannot_commit = false;
|
|
delay = HZ * root->fs_info->commit_interval;
|
|
mutex_lock(&root->fs_info->transaction_kthread_mutex);
|
|
|
|
spin_lock(&root->fs_info->trans_lock);
|
|
cur = root->fs_info->running_transaction;
|
|
if (!cur) {
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
goto sleep;
|
|
}
|
|
|
|
now = get_seconds();
|
|
if (cur->state < TRANS_STATE_BLOCKED &&
|
|
(now < cur->start_time ||
|
|
now - cur->start_time < root->fs_info->commit_interval)) {
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
delay = HZ * 5;
|
|
goto sleep;
|
|
}
|
|
transid = cur->transid;
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
|
|
/* If the file system is aborted, this will always fail. */
|
|
trans = btrfs_attach_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
if (PTR_ERR(trans) != -ENOENT)
|
|
cannot_commit = true;
|
|
goto sleep;
|
|
}
|
|
if (transid == trans->transid) {
|
|
btrfs_commit_transaction(trans, root);
|
|
} else {
|
|
btrfs_end_transaction(trans, root);
|
|
}
|
|
sleep:
|
|
wake_up_process(root->fs_info->cleaner_kthread);
|
|
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
|
|
|
|
if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
|
|
&root->fs_info->fs_state)))
|
|
btrfs_cleanup_transaction(root);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (!kthread_should_stop() &&
|
|
(!btrfs_transaction_blocked(root->fs_info) ||
|
|
cannot_commit))
|
|
schedule_timeout(delay);
|
|
__set_current_state(TASK_RUNNING);
|
|
} while (!kthread_should_stop());
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this will find the highest generation in the array of
|
|
* root backups. The index of the highest array is returned,
|
|
* or -1 if we can't find anything.
|
|
*
|
|
* We check to make sure the array is valid by comparing the
|
|
* generation of the latest root in the array with the generation
|
|
* in the super block. If they don't match we pitch it.
|
|
*/
|
|
static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
|
|
{
|
|
u64 cur;
|
|
int newest_index = -1;
|
|
struct btrfs_root_backup *root_backup;
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
|
|
root_backup = info->super_copy->super_roots + i;
|
|
cur = btrfs_backup_tree_root_gen(root_backup);
|
|
if (cur == newest_gen)
|
|
newest_index = i;
|
|
}
|
|
|
|
/* check to see if we actually wrapped around */
|
|
if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
|
|
root_backup = info->super_copy->super_roots;
|
|
cur = btrfs_backup_tree_root_gen(root_backup);
|
|
if (cur == newest_gen)
|
|
newest_index = 0;
|
|
}
|
|
return newest_index;
|
|
}
|
|
|
|
|
|
/*
|
|
* find the oldest backup so we know where to store new entries
|
|
* in the backup array. This will set the backup_root_index
|
|
* field in the fs_info struct
|
|
*/
|
|
static void find_oldest_super_backup(struct btrfs_fs_info *info,
|
|
u64 newest_gen)
|
|
{
|
|
int newest_index = -1;
|
|
|
|
newest_index = find_newest_super_backup(info, newest_gen);
|
|
/* if there was garbage in there, just move along */
|
|
if (newest_index == -1) {
|
|
info->backup_root_index = 0;
|
|
} else {
|
|
info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* copy all the root pointers into the super backup array.
|
|
* this will bump the backup pointer by one when it is
|
|
* done
|
|
*/
|
|
static void backup_super_roots(struct btrfs_fs_info *info)
|
|
{
|
|
int next_backup;
|
|
struct btrfs_root_backup *root_backup;
|
|
int last_backup;
|
|
|
|
next_backup = info->backup_root_index;
|
|
last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
|
|
BTRFS_NUM_BACKUP_ROOTS;
|
|
|
|
/*
|
|
* just overwrite the last backup if we're at the same generation
|
|
* this happens only at umount
|
|
*/
|
|
root_backup = info->super_for_commit->super_roots + last_backup;
|
|
if (btrfs_backup_tree_root_gen(root_backup) ==
|
|
btrfs_header_generation(info->tree_root->node))
|
|
next_backup = last_backup;
|
|
|
|
root_backup = info->super_for_commit->super_roots + next_backup;
|
|
|
|
/*
|
|
* make sure all of our padding and empty slots get zero filled
|
|
* regardless of which ones we use today
|
|
*/
|
|
memset(root_backup, 0, sizeof(*root_backup));
|
|
|
|
info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
|
|
|
|
btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
|
|
btrfs_set_backup_tree_root_gen(root_backup,
|
|
btrfs_header_generation(info->tree_root->node));
|
|
|
|
btrfs_set_backup_tree_root_level(root_backup,
|
|
btrfs_header_level(info->tree_root->node));
|
|
|
|
btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
|
|
btrfs_set_backup_chunk_root_gen(root_backup,
|
|
btrfs_header_generation(info->chunk_root->node));
|
|
btrfs_set_backup_chunk_root_level(root_backup,
|
|
btrfs_header_level(info->chunk_root->node));
|
|
|
|
btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
|
|
btrfs_set_backup_extent_root_gen(root_backup,
|
|
btrfs_header_generation(info->extent_root->node));
|
|
btrfs_set_backup_extent_root_level(root_backup,
|
|
btrfs_header_level(info->extent_root->node));
|
|
|
|
/*
|
|
* we might commit during log recovery, which happens before we set
|
|
* the fs_root. Make sure it is valid before we fill it in.
|
|
*/
|
|
if (info->fs_root && info->fs_root->node) {
|
|
btrfs_set_backup_fs_root(root_backup,
|
|
info->fs_root->node->start);
|
|
btrfs_set_backup_fs_root_gen(root_backup,
|
|
btrfs_header_generation(info->fs_root->node));
|
|
btrfs_set_backup_fs_root_level(root_backup,
|
|
btrfs_header_level(info->fs_root->node));
|
|
}
|
|
|
|
btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
|
|
btrfs_set_backup_dev_root_gen(root_backup,
|
|
btrfs_header_generation(info->dev_root->node));
|
|
btrfs_set_backup_dev_root_level(root_backup,
|
|
btrfs_header_level(info->dev_root->node));
|
|
|
|
btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
|
|
btrfs_set_backup_csum_root_gen(root_backup,
|
|
btrfs_header_generation(info->csum_root->node));
|
|
btrfs_set_backup_csum_root_level(root_backup,
|
|
btrfs_header_level(info->csum_root->node));
|
|
|
|
btrfs_set_backup_total_bytes(root_backup,
|
|
btrfs_super_total_bytes(info->super_copy));
|
|
btrfs_set_backup_bytes_used(root_backup,
|
|
btrfs_super_bytes_used(info->super_copy));
|
|
btrfs_set_backup_num_devices(root_backup,
|
|
btrfs_super_num_devices(info->super_copy));
|
|
|
|
/*
|
|
* if we don't copy this out to the super_copy, it won't get remembered
|
|
* for the next commit
|
|
*/
|
|
memcpy(&info->super_copy->super_roots,
|
|
&info->super_for_commit->super_roots,
|
|
sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
|
|
}
|
|
|
|
/*
|
|
* this copies info out of the root backup array and back into
|
|
* the in-memory super block. It is meant to help iterate through
|
|
* the array, so you send it the number of backups you've already
|
|
* tried and the last backup index you used.
|
|
*
|
|
* this returns -1 when it has tried all the backups
|
|
*/
|
|
static noinline int next_root_backup(struct btrfs_fs_info *info,
|
|
struct btrfs_super_block *super,
|
|
int *num_backups_tried, int *backup_index)
|
|
{
|
|
struct btrfs_root_backup *root_backup;
|
|
int newest = *backup_index;
|
|
|
|
if (*num_backups_tried == 0) {
|
|
u64 gen = btrfs_super_generation(super);
|
|
|
|
newest = find_newest_super_backup(info, gen);
|
|
if (newest == -1)
|
|
return -1;
|
|
|
|
*backup_index = newest;
|
|
*num_backups_tried = 1;
|
|
} else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
|
|
/* we've tried all the backups, all done */
|
|
return -1;
|
|
} else {
|
|
/* jump to the next oldest backup */
|
|
newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
|
|
BTRFS_NUM_BACKUP_ROOTS;
|
|
*backup_index = newest;
|
|
*num_backups_tried += 1;
|
|
}
|
|
root_backup = super->super_roots + newest;
|
|
|
|
btrfs_set_super_generation(super,
|
|
btrfs_backup_tree_root_gen(root_backup));
|
|
btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
|
|
btrfs_set_super_root_level(super,
|
|
btrfs_backup_tree_root_level(root_backup));
|
|
btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
|
|
|
|
/*
|
|
* fixme: the total bytes and num_devices need to match or we should
|
|
* need a fsck
|
|
*/
|
|
btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
|
|
btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
|
|
return 0;
|
|
}
|
|
|
|
/* helper to cleanup workers */
|
|
static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
|
|
{
|
|
btrfs_destroy_workqueue(fs_info->fixup_workers);
|
|
btrfs_destroy_workqueue(fs_info->delalloc_workers);
|
|
btrfs_destroy_workqueue(fs_info->workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_meta_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_repair_workers);
|
|
btrfs_destroy_workqueue(fs_info->rmw_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_write_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
|
|
btrfs_destroy_workqueue(fs_info->submit_workers);
|
|
btrfs_destroy_workqueue(fs_info->delayed_workers);
|
|
btrfs_destroy_workqueue(fs_info->caching_workers);
|
|
btrfs_destroy_workqueue(fs_info->readahead_workers);
|
|
btrfs_destroy_workqueue(fs_info->flush_workers);
|
|
btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
|
|
btrfs_destroy_workqueue(fs_info->extent_workers);
|
|
}
|
|
|
|
static void free_root_extent_buffers(struct btrfs_root *root)
|
|
{
|
|
if (root) {
|
|
free_extent_buffer(root->node);
|
|
free_extent_buffer(root->commit_root);
|
|
root->node = NULL;
|
|
root->commit_root = NULL;
|
|
}
|
|
}
|
|
|
|
/* helper to cleanup tree roots */
|
|
static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
|
|
{
|
|
free_root_extent_buffers(info->tree_root);
|
|
|
|
free_root_extent_buffers(info->dev_root);
|
|
free_root_extent_buffers(info->extent_root);
|
|
free_root_extent_buffers(info->csum_root);
|
|
free_root_extent_buffers(info->quota_root);
|
|
free_root_extent_buffers(info->uuid_root);
|
|
if (chunk_root)
|
|
free_root_extent_buffers(info->chunk_root);
|
|
free_root_extent_buffers(info->free_space_root);
|
|
}
|
|
|
|
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *gang[8];
|
|
int i;
|
|
|
|
while (!list_empty(&fs_info->dead_roots)) {
|
|
gang[0] = list_entry(fs_info->dead_roots.next,
|
|
struct btrfs_root, root_list);
|
|
list_del(&gang[0]->root_list);
|
|
|
|
if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
|
|
btrfs_drop_and_free_fs_root(fs_info, gang[0]);
|
|
} else {
|
|
free_extent_buffer(gang[0]->node);
|
|
free_extent_buffer(gang[0]->commit_root);
|
|
btrfs_put_fs_root(gang[0]);
|
|
}
|
|
}
|
|
|
|
while (1) {
|
|
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, 0,
|
|
ARRAY_SIZE(gang));
|
|
if (!ret)
|
|
break;
|
|
for (i = 0; i < ret; i++)
|
|
btrfs_drop_and_free_fs_root(fs_info, gang[i]);
|
|
}
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
|
|
btrfs_free_log_root_tree(NULL, fs_info);
|
|
btrfs_destroy_pinned_extent(fs_info->tree_root,
|
|
fs_info->pinned_extents);
|
|
}
|
|
}
|
|
|
|
static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
|
|
{
|
|
mutex_init(&fs_info->scrub_lock);
|
|
atomic_set(&fs_info->scrubs_running, 0);
|
|
atomic_set(&fs_info->scrub_pause_req, 0);
|
|
atomic_set(&fs_info->scrubs_paused, 0);
|
|
atomic_set(&fs_info->scrub_cancel_req, 0);
|
|
init_waitqueue_head(&fs_info->scrub_pause_wait);
|
|
fs_info->scrub_workers_refcnt = 0;
|
|
}
|
|
|
|
static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
|
|
{
|
|
spin_lock_init(&fs_info->balance_lock);
|
|
mutex_init(&fs_info->balance_mutex);
|
|
atomic_set(&fs_info->balance_running, 0);
|
|
atomic_set(&fs_info->balance_pause_req, 0);
|
|
atomic_set(&fs_info->balance_cancel_req, 0);
|
|
fs_info->balance_ctl = NULL;
|
|
init_waitqueue_head(&fs_info->balance_wait_q);
|
|
}
|
|
|
|
static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *tree_root)
|
|
{
|
|
fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
|
|
set_nlink(fs_info->btree_inode, 1);
|
|
/*
|
|
* we set the i_size on the btree inode to the max possible int.
|
|
* the real end of the address space is determined by all of
|
|
* the devices in the system
|
|
*/
|
|
fs_info->btree_inode->i_size = OFFSET_MAX;
|
|
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
|
|
|
|
RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
|
|
extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
|
|
fs_info->btree_inode->i_mapping);
|
|
BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0;
|
|
extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree);
|
|
|
|
BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
|
|
|
|
BTRFS_I(fs_info->btree_inode)->root = tree_root;
|
|
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
|
|
sizeof(struct btrfs_key));
|
|
set_bit(BTRFS_INODE_DUMMY,
|
|
&BTRFS_I(fs_info->btree_inode)->runtime_flags);
|
|
btrfs_insert_inode_hash(fs_info->btree_inode);
|
|
}
|
|
|
|
static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
|
|
{
|
|
fs_info->dev_replace.lock_owner = 0;
|
|
atomic_set(&fs_info->dev_replace.nesting_level, 0);
|
|
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
|
|
rwlock_init(&fs_info->dev_replace.lock);
|
|
atomic_set(&fs_info->dev_replace.read_locks, 0);
|
|
atomic_set(&fs_info->dev_replace.blocking_readers, 0);
|
|
init_waitqueue_head(&fs_info->replace_wait);
|
|
init_waitqueue_head(&fs_info->dev_replace.read_lock_wq);
|
|
}
|
|
|
|
static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
|
|
{
|
|
spin_lock_init(&fs_info->qgroup_lock);
|
|
mutex_init(&fs_info->qgroup_ioctl_lock);
|
|
fs_info->qgroup_tree = RB_ROOT;
|
|
fs_info->qgroup_op_tree = RB_ROOT;
|
|
INIT_LIST_HEAD(&fs_info->dirty_qgroups);
|
|
fs_info->qgroup_seq = 1;
|
|
fs_info->qgroup_ulist = NULL;
|
|
fs_info->qgroup_rescan_running = false;
|
|
mutex_init(&fs_info->qgroup_rescan_lock);
|
|
}
|
|
|
|
static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_fs_devices *fs_devices)
|
|
{
|
|
int max_active = fs_info->thread_pool_size;
|
|
unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
|
|
|
|
fs_info->workers =
|
|
btrfs_alloc_workqueue(fs_info, "worker",
|
|
flags | WQ_HIGHPRI, max_active, 16);
|
|
|
|
fs_info->delalloc_workers =
|
|
btrfs_alloc_workqueue(fs_info, "delalloc",
|
|
flags, max_active, 2);
|
|
|
|
fs_info->flush_workers =
|
|
btrfs_alloc_workqueue(fs_info, "flush_delalloc",
|
|
flags, max_active, 0);
|
|
|
|
fs_info->caching_workers =
|
|
btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
|
|
|
|
/*
|
|
* a higher idle thresh on the submit workers makes it much more
|
|
* likely that bios will be send down in a sane order to the
|
|
* devices
|
|
*/
|
|
fs_info->submit_workers =
|
|
btrfs_alloc_workqueue(fs_info, "submit", flags,
|
|
min_t(u64, fs_devices->num_devices,
|
|
max_active), 64);
|
|
|
|
fs_info->fixup_workers =
|
|
btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
|
|
|
|
/*
|
|
* endios are largely parallel and should have a very
|
|
* low idle thresh
|
|
*/
|
|
fs_info->endio_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
|
|
fs_info->endio_meta_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
|
|
max_active, 4);
|
|
fs_info->endio_meta_write_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
|
|
max_active, 2);
|
|
fs_info->endio_raid56_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
|
|
max_active, 4);
|
|
fs_info->endio_repair_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
|
|
fs_info->rmw_workers =
|
|
btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
|
|
fs_info->endio_write_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-write", flags,
|
|
max_active, 2);
|
|
fs_info->endio_freespace_worker =
|
|
btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
|
|
max_active, 0);
|
|
fs_info->delayed_workers =
|
|
btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
|
|
max_active, 0);
|
|
fs_info->readahead_workers =
|
|
btrfs_alloc_workqueue(fs_info, "readahead", flags,
|
|
max_active, 2);
|
|
fs_info->qgroup_rescan_workers =
|
|
btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
|
|
fs_info->extent_workers =
|
|
btrfs_alloc_workqueue(fs_info, "extent-refs", flags,
|
|
min_t(u64, fs_devices->num_devices,
|
|
max_active), 8);
|
|
|
|
if (!(fs_info->workers && fs_info->delalloc_workers &&
|
|
fs_info->submit_workers && fs_info->flush_workers &&
|
|
fs_info->endio_workers && fs_info->endio_meta_workers &&
|
|
fs_info->endio_meta_write_workers &&
|
|
fs_info->endio_repair_workers &&
|
|
fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
|
|
fs_info->endio_freespace_worker && fs_info->rmw_workers &&
|
|
fs_info->caching_workers && fs_info->readahead_workers &&
|
|
fs_info->fixup_workers && fs_info->delayed_workers &&
|
|
fs_info->extent_workers &&
|
|
fs_info->qgroup_rescan_workers)) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_fs_devices *fs_devices)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *log_tree_root;
|
|
struct btrfs_super_block *disk_super = fs_info->super_copy;
|
|
u64 bytenr = btrfs_super_log_root(disk_super);
|
|
|
|
if (fs_devices->rw_devices == 0) {
|
|
btrfs_warn(fs_info, "log replay required on RO media");
|
|
return -EIO;
|
|
}
|
|
|
|
log_tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
|
|
if (!log_tree_root)
|
|
return -ENOMEM;
|
|
|
|
__setup_root(tree_root->nodesize, tree_root->sectorsize,
|
|
tree_root->stripesize, log_tree_root, fs_info,
|
|
BTRFS_TREE_LOG_OBJECTID);
|
|
|
|
log_tree_root->node = read_tree_block(tree_root, bytenr,
|
|
fs_info->generation + 1);
|
|
if (IS_ERR(log_tree_root->node)) {
|
|
btrfs_warn(fs_info, "failed to read log tree");
|
|
ret = PTR_ERR(log_tree_root->node);
|
|
kfree(log_tree_root);
|
|
return ret;
|
|
} else if (!extent_buffer_uptodate(log_tree_root->node)) {
|
|
btrfs_err(fs_info, "failed to read log tree");
|
|
free_extent_buffer(log_tree_root->node);
|
|
kfree(log_tree_root);
|
|
return -EIO;
|
|
}
|
|
/* returns with log_tree_root freed on success */
|
|
ret = btrfs_recover_log_trees(log_tree_root);
|
|
if (ret) {
|
|
btrfs_handle_fs_error(tree_root->fs_info, ret,
|
|
"Failed to recover log tree");
|
|
free_extent_buffer(log_tree_root->node);
|
|
kfree(log_tree_root);
|
|
return ret;
|
|
}
|
|
|
|
if (fs_info->sb->s_flags & MS_RDONLY) {
|
|
ret = btrfs_commit_super(tree_root);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_read_roots(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *tree_root)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_key location;
|
|
int ret;
|
|
|
|
location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
|
|
location.type = BTRFS_ROOT_ITEM_KEY;
|
|
location.offset = 0;
|
|
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root))
|
|
return PTR_ERR(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->extent_root = root;
|
|
|
|
location.objectid = BTRFS_DEV_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root))
|
|
return PTR_ERR(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->dev_root = root;
|
|
btrfs_init_devices_late(fs_info);
|
|
|
|
location.objectid = BTRFS_CSUM_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root))
|
|
return PTR_ERR(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->csum_root = root;
|
|
|
|
location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (!IS_ERR(root)) {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
|
|
fs_info->quota_root = root;
|
|
}
|
|
|
|
location.objectid = BTRFS_UUID_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
ret = PTR_ERR(root);
|
|
if (ret != -ENOENT)
|
|
return ret;
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->uuid_root = root;
|
|
}
|
|
|
|
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root))
|
|
return PTR_ERR(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->free_space_root = root;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int open_ctree(struct super_block *sb,
|
|
struct btrfs_fs_devices *fs_devices,
|
|
char *options)
|
|
{
|
|
u32 sectorsize;
|
|
u32 nodesize;
|
|
u32 stripesize;
|
|
u64 generation;
|
|
u64 features;
|
|
struct btrfs_key location;
|
|
struct buffer_head *bh;
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
struct btrfs_root *tree_root;
|
|
struct btrfs_root *chunk_root;
|
|
int ret;
|
|
int err = -EINVAL;
|
|
int num_backups_tried = 0;
|
|
int backup_index = 0;
|
|
int max_active;
|
|
int clear_free_space_tree = 0;
|
|
|
|
tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
|
|
chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
|
|
if (!tree_root || !chunk_root) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ret = init_srcu_struct(&fs_info->subvol_srcu);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
|
|
ret = setup_bdi(fs_info, &fs_info->bdi);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_srcu;
|
|
}
|
|
|
|
ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_bdi;
|
|
}
|
|
fs_info->dirty_metadata_batch = PAGE_SIZE *
|
|
(1 + ilog2(nr_cpu_ids));
|
|
|
|
ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_dirty_metadata_bytes;
|
|
}
|
|
|
|
ret = percpu_counter_init(&fs_info->bio_counter, 0, GFP_KERNEL);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_delalloc_bytes;
|
|
}
|
|
|
|
fs_info->btree_inode = new_inode(sb);
|
|
if (!fs_info->btree_inode) {
|
|
err = -ENOMEM;
|
|
goto fail_bio_counter;
|
|
}
|
|
|
|
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
|
|
|
|
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
|
|
INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
|
|
INIT_LIST_HEAD(&fs_info->trans_list);
|
|
INIT_LIST_HEAD(&fs_info->dead_roots);
|
|
INIT_LIST_HEAD(&fs_info->delayed_iputs);
|
|
INIT_LIST_HEAD(&fs_info->delalloc_roots);
|
|
INIT_LIST_HEAD(&fs_info->caching_block_groups);
|
|
spin_lock_init(&fs_info->delalloc_root_lock);
|
|
spin_lock_init(&fs_info->trans_lock);
|
|
spin_lock_init(&fs_info->fs_roots_radix_lock);
|
|
spin_lock_init(&fs_info->delayed_iput_lock);
|
|
spin_lock_init(&fs_info->defrag_inodes_lock);
|
|
spin_lock_init(&fs_info->free_chunk_lock);
|
|
spin_lock_init(&fs_info->tree_mod_seq_lock);
|
|
spin_lock_init(&fs_info->super_lock);
|
|
spin_lock_init(&fs_info->qgroup_op_lock);
|
|
spin_lock_init(&fs_info->buffer_lock);
|
|
spin_lock_init(&fs_info->unused_bgs_lock);
|
|
rwlock_init(&fs_info->tree_mod_log_lock);
|
|
mutex_init(&fs_info->unused_bg_unpin_mutex);
|
|
mutex_init(&fs_info->delete_unused_bgs_mutex);
|
|
mutex_init(&fs_info->reloc_mutex);
|
|
mutex_init(&fs_info->delalloc_root_mutex);
|
|
mutex_init(&fs_info->cleaner_delayed_iput_mutex);
|
|
seqlock_init(&fs_info->profiles_lock);
|
|
|
|
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
|
|
INIT_LIST_HEAD(&fs_info->space_info);
|
|
INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
|
|
INIT_LIST_HEAD(&fs_info->unused_bgs);
|
|
btrfs_mapping_init(&fs_info->mapping_tree);
|
|
btrfs_init_block_rsv(&fs_info->global_block_rsv,
|
|
BTRFS_BLOCK_RSV_GLOBAL);
|
|
btrfs_init_block_rsv(&fs_info->delalloc_block_rsv,
|
|
BTRFS_BLOCK_RSV_DELALLOC);
|
|
btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
|
|
btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
|
|
btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
|
|
btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
|
|
BTRFS_BLOCK_RSV_DELOPS);
|
|
atomic_set(&fs_info->nr_async_submits, 0);
|
|
atomic_set(&fs_info->async_delalloc_pages, 0);
|
|
atomic_set(&fs_info->async_submit_draining, 0);
|
|
atomic_set(&fs_info->nr_async_bios, 0);
|
|
atomic_set(&fs_info->defrag_running, 0);
|
|
atomic_set(&fs_info->qgroup_op_seq, 0);
|
|
atomic_set(&fs_info->reada_works_cnt, 0);
|
|
atomic64_set(&fs_info->tree_mod_seq, 0);
|
|
fs_info->fs_frozen = 0;
|
|
fs_info->sb = sb;
|
|
fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
|
|
fs_info->metadata_ratio = 0;
|
|
fs_info->defrag_inodes = RB_ROOT;
|
|
fs_info->free_chunk_space = 0;
|
|
fs_info->tree_mod_log = RB_ROOT;
|
|
fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
|
|
fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
|
|
/* readahead state */
|
|
INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
|
|
spin_lock_init(&fs_info->reada_lock);
|
|
|
|
fs_info->thread_pool_size = min_t(unsigned long,
|
|
num_online_cpus() + 2, 8);
|
|
|
|
INIT_LIST_HEAD(&fs_info->ordered_roots);
|
|
spin_lock_init(&fs_info->ordered_root_lock);
|
|
fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
|
|
GFP_KERNEL);
|
|
if (!fs_info->delayed_root) {
|
|
err = -ENOMEM;
|
|
goto fail_iput;
|
|
}
|
|
btrfs_init_delayed_root(fs_info->delayed_root);
|
|
|
|
btrfs_init_scrub(fs_info);
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
fs_info->check_integrity_print_mask = 0;
|
|
#endif
|
|
btrfs_init_balance(fs_info);
|
|
btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
|
|
|
|
sb->s_blocksize = 4096;
|
|
sb->s_blocksize_bits = blksize_bits(4096);
|
|
sb->s_bdi = &fs_info->bdi;
|
|
|
|
btrfs_init_btree_inode(fs_info, tree_root);
|
|
|
|
spin_lock_init(&fs_info->block_group_cache_lock);
|
|
fs_info->block_group_cache_tree = RB_ROOT;
|
|
fs_info->first_logical_byte = (u64)-1;
|
|
|
|
extent_io_tree_init(&fs_info->freed_extents[0],
|
|
fs_info->btree_inode->i_mapping);
|
|
extent_io_tree_init(&fs_info->freed_extents[1],
|
|
fs_info->btree_inode->i_mapping);
|
|
fs_info->pinned_extents = &fs_info->freed_extents[0];
|
|
set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
|
|
|
|
mutex_init(&fs_info->ordered_operations_mutex);
|
|
mutex_init(&fs_info->tree_log_mutex);
|
|
mutex_init(&fs_info->chunk_mutex);
|
|
mutex_init(&fs_info->transaction_kthread_mutex);
|
|
mutex_init(&fs_info->cleaner_mutex);
|
|
mutex_init(&fs_info->volume_mutex);
|
|
mutex_init(&fs_info->ro_block_group_mutex);
|
|
init_rwsem(&fs_info->commit_root_sem);
|
|
init_rwsem(&fs_info->cleanup_work_sem);
|
|
init_rwsem(&fs_info->subvol_sem);
|
|
sema_init(&fs_info->uuid_tree_rescan_sem, 1);
|
|
|
|
btrfs_init_dev_replace_locks(fs_info);
|
|
btrfs_init_qgroup(fs_info);
|
|
|
|
btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
|
|
btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
|
|
|
|
init_waitqueue_head(&fs_info->transaction_throttle);
|
|
init_waitqueue_head(&fs_info->transaction_wait);
|
|
init_waitqueue_head(&fs_info->transaction_blocked_wait);
|
|
init_waitqueue_head(&fs_info->async_submit_wait);
|
|
|
|
INIT_LIST_HEAD(&fs_info->pinned_chunks);
|
|
|
|
ret = btrfs_alloc_stripe_hash_table(fs_info);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
__setup_root(4096, 4096, 4096, tree_root,
|
|
fs_info, BTRFS_ROOT_TREE_OBJECTID);
|
|
|
|
invalidate_bdev(fs_devices->latest_bdev);
|
|
|
|
/*
|
|
* Read super block and check the signature bytes only
|
|
*/
|
|
bh = btrfs_read_dev_super(fs_devices->latest_bdev);
|
|
if (IS_ERR(bh)) {
|
|
err = PTR_ERR(bh);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* We want to check superblock checksum, the type is stored inside.
|
|
* Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
|
|
*/
|
|
if (btrfs_check_super_csum(fs_info, bh->b_data)) {
|
|
btrfs_err(fs_info, "superblock checksum mismatch");
|
|
err = -EINVAL;
|
|
brelse(bh);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* super_copy is zeroed at allocation time and we never touch the
|
|
* following bytes up to INFO_SIZE, the checksum is calculated from
|
|
* the whole block of INFO_SIZE
|
|
*/
|
|
memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
|
|
memcpy(fs_info->super_for_commit, fs_info->super_copy,
|
|
sizeof(*fs_info->super_for_commit));
|
|
brelse(bh);
|
|
|
|
memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
|
|
|
|
ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "superblock contains fatal errors");
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
disk_super = fs_info->super_copy;
|
|
if (!btrfs_super_root(disk_super))
|
|
goto fail_alloc;
|
|
|
|
/* check FS state, whether FS is broken. */
|
|
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
|
|
set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
|
|
|
|
/*
|
|
* run through our array of backup supers and setup
|
|
* our ring pointer to the oldest one
|
|
*/
|
|
generation = btrfs_super_generation(disk_super);
|
|
find_oldest_super_backup(fs_info, generation);
|
|
|
|
/*
|
|
* In the long term, we'll store the compression type in the super
|
|
* block, and it'll be used for per file compression control.
|
|
*/
|
|
fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
|
|
|
|
ret = btrfs_parse_options(tree_root, options, sb->s_flags);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
features = btrfs_super_incompat_flags(disk_super) &
|
|
~BTRFS_FEATURE_INCOMPAT_SUPP;
|
|
if (features) {
|
|
btrfs_err(fs_info,
|
|
"cannot mount because of unsupported optional features (%llx)",
|
|
features);
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
features = btrfs_super_incompat_flags(disk_super);
|
|
features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
|
|
if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
|
|
features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
|
|
|
|
if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
|
|
btrfs_info(fs_info, "has skinny extents");
|
|
|
|
/*
|
|
* flag our filesystem as having big metadata blocks if
|
|
* they are bigger than the page size
|
|
*/
|
|
if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
|
|
if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
|
|
btrfs_info(fs_info,
|
|
"flagging fs with big metadata feature");
|
|
features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
|
|
}
|
|
|
|
nodesize = btrfs_super_nodesize(disk_super);
|
|
sectorsize = btrfs_super_sectorsize(disk_super);
|
|
stripesize = sectorsize;
|
|
fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
|
|
fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
|
|
|
|
/*
|
|
* mixed block groups end up with duplicate but slightly offset
|
|
* extent buffers for the same range. It leads to corruptions
|
|
*/
|
|
if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
|
|
(sectorsize != nodesize)) {
|
|
btrfs_err(fs_info,
|
|
"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
|
|
nodesize, sectorsize);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* Needn't use the lock because there is no other task which will
|
|
* update the flag.
|
|
*/
|
|
btrfs_set_super_incompat_flags(disk_super, features);
|
|
|
|
features = btrfs_super_compat_ro_flags(disk_super) &
|
|
~BTRFS_FEATURE_COMPAT_RO_SUPP;
|
|
if (!(sb->s_flags & MS_RDONLY) && features) {
|
|
btrfs_err(fs_info,
|
|
"cannot mount read-write because of unsupported optional features (%llx)",
|
|
features);
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
max_active = fs_info->thread_pool_size;
|
|
|
|
ret = btrfs_init_workqueues(fs_info, fs_devices);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_sb_buffer;
|
|
}
|
|
|
|
fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
|
|
fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
|
|
SZ_4M / PAGE_SIZE);
|
|
|
|
tree_root->nodesize = nodesize;
|
|
tree_root->sectorsize = sectorsize;
|
|
tree_root->stripesize = stripesize;
|
|
|
|
sb->s_blocksize = sectorsize;
|
|
sb->s_blocksize_bits = blksize_bits(sectorsize);
|
|
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
ret = btrfs_read_sys_array(tree_root);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read the system array: %d", ret);
|
|
goto fail_sb_buffer;
|
|
}
|
|
|
|
generation = btrfs_super_chunk_root_generation(disk_super);
|
|
|
|
__setup_root(nodesize, sectorsize, stripesize, chunk_root,
|
|
fs_info, BTRFS_CHUNK_TREE_OBJECTID);
|
|
|
|
chunk_root->node = read_tree_block(chunk_root,
|
|
btrfs_super_chunk_root(disk_super),
|
|
generation);
|
|
if (IS_ERR(chunk_root->node) ||
|
|
!extent_buffer_uptodate(chunk_root->node)) {
|
|
btrfs_err(fs_info, "failed to read chunk root");
|
|
if (!IS_ERR(chunk_root->node))
|
|
free_extent_buffer(chunk_root->node);
|
|
chunk_root->node = NULL;
|
|
goto fail_tree_roots;
|
|
}
|
|
btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
|
|
chunk_root->commit_root = btrfs_root_node(chunk_root);
|
|
|
|
read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
|
|
btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
|
|
|
|
ret = btrfs_read_chunk_tree(chunk_root);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
/*
|
|
* keep the device that is marked to be the target device for the
|
|
* dev_replace procedure
|
|
*/
|
|
btrfs_close_extra_devices(fs_devices, 0);
|
|
|
|
if (!fs_devices->latest_bdev) {
|
|
btrfs_err(fs_info, "failed to read devices");
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
retry_root_backup:
|
|
generation = btrfs_super_generation(disk_super);
|
|
|
|
tree_root->node = read_tree_block(tree_root,
|
|
btrfs_super_root(disk_super),
|
|
generation);
|
|
if (IS_ERR(tree_root->node) ||
|
|
!extent_buffer_uptodate(tree_root->node)) {
|
|
btrfs_warn(fs_info, "failed to read tree root");
|
|
if (!IS_ERR(tree_root->node))
|
|
free_extent_buffer(tree_root->node);
|
|
tree_root->node = NULL;
|
|
goto recovery_tree_root;
|
|
}
|
|
|
|
btrfs_set_root_node(&tree_root->root_item, tree_root->node);
|
|
tree_root->commit_root = btrfs_root_node(tree_root);
|
|
btrfs_set_root_refs(&tree_root->root_item, 1);
|
|
|
|
mutex_lock(&tree_root->objectid_mutex);
|
|
ret = btrfs_find_highest_objectid(tree_root,
|
|
&tree_root->highest_objectid);
|
|
if (ret) {
|
|
mutex_unlock(&tree_root->objectid_mutex);
|
|
goto recovery_tree_root;
|
|
}
|
|
|
|
ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
|
|
|
|
mutex_unlock(&tree_root->objectid_mutex);
|
|
|
|
ret = btrfs_read_roots(fs_info, tree_root);
|
|
if (ret)
|
|
goto recovery_tree_root;
|
|
|
|
fs_info->generation = generation;
|
|
fs_info->last_trans_committed = generation;
|
|
|
|
ret = btrfs_recover_balance(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to recover balance: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_init_dev_stats(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_init_dev_replace(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
btrfs_close_extra_devices(fs_devices, 1);
|
|
|
|
ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_device(fs_devices);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs device interface: %d",
|
|
ret);
|
|
goto fail_fsdev_sysfs;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_mounted(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
|
|
goto fail_fsdev_sysfs;
|
|
}
|
|
|
|
ret = btrfs_init_space_info(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to initialize space info: %d", ret);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
ret = btrfs_read_block_groups(fs_info->extent_root);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read block groups: %d", ret);
|
|
goto fail_sysfs;
|
|
}
|
|
fs_info->num_tolerated_disk_barrier_failures =
|
|
btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
|
|
if (fs_info->fs_devices->missing_devices >
|
|
fs_info->num_tolerated_disk_barrier_failures &&
|
|
!(sb->s_flags & MS_RDONLY)) {
|
|
btrfs_warn(fs_info,
|
|
"missing devices (%llu) exceeds the limit (%d), writeable mount is not allowed",
|
|
fs_info->fs_devices->missing_devices,
|
|
fs_info->num_tolerated_disk_barrier_failures);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
|
|
"btrfs-cleaner");
|
|
if (IS_ERR(fs_info->cleaner_kthread))
|
|
goto fail_sysfs;
|
|
|
|
fs_info->transaction_kthread = kthread_run(transaction_kthread,
|
|
tree_root,
|
|
"btrfs-transaction");
|
|
if (IS_ERR(fs_info->transaction_kthread))
|
|
goto fail_cleaner;
|
|
|
|
if (!btrfs_test_opt(tree_root->fs_info, SSD) &&
|
|
!btrfs_test_opt(tree_root->fs_info, NOSSD) &&
|
|
!fs_info->fs_devices->rotating) {
|
|
btrfs_info(fs_info, "detected SSD devices, enabling SSD mode");
|
|
btrfs_set_opt(fs_info->mount_opt, SSD);
|
|
}
|
|
|
|
/*
|
|
* Mount does not set all options immediately, we can do it now and do
|
|
* not have to wait for transaction commit
|
|
*/
|
|
btrfs_apply_pending_changes(fs_info);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
if (btrfs_test_opt(tree_root->fs_info, CHECK_INTEGRITY)) {
|
|
ret = btrfsic_mount(tree_root, fs_devices,
|
|
btrfs_test_opt(tree_root->fs_info,
|
|
CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
|
|
1 : 0,
|
|
fs_info->check_integrity_print_mask);
|
|
if (ret)
|
|
btrfs_warn(fs_info,
|
|
"failed to initialize integrity check module: %d",
|
|
ret);
|
|
}
|
|
#endif
|
|
ret = btrfs_read_qgroup_config(fs_info);
|
|
if (ret)
|
|
goto fail_trans_kthread;
|
|
|
|
/* do not make disk changes in broken FS or nologreplay is given */
|
|
if (btrfs_super_log_root(disk_super) != 0 &&
|
|
!btrfs_test_opt(tree_root->fs_info, NOLOGREPLAY)) {
|
|
ret = btrfs_replay_log(fs_info, fs_devices);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_qgroup;
|
|
}
|
|
}
|
|
|
|
ret = btrfs_find_orphan_roots(tree_root);
|
|
if (ret)
|
|
goto fail_qgroup;
|
|
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
ret = btrfs_cleanup_fs_roots(fs_info);
|
|
if (ret)
|
|
goto fail_qgroup;
|
|
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
ret = btrfs_recover_relocation(tree_root);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
if (ret < 0) {
|
|
btrfs_warn(fs_info, "failed to recover relocation: %d",
|
|
ret);
|
|
err = -EINVAL;
|
|
goto fail_qgroup;
|
|
}
|
|
}
|
|
|
|
location.objectid = BTRFS_FS_TREE_OBJECTID;
|
|
location.type = BTRFS_ROOT_ITEM_KEY;
|
|
location.offset = 0;
|
|
|
|
fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
|
|
if (IS_ERR(fs_info->fs_root)) {
|
|
err = PTR_ERR(fs_info->fs_root);
|
|
goto fail_qgroup;
|
|
}
|
|
|
|
if (sb->s_flags & MS_RDONLY)
|
|
return 0;
|
|
|
|
if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
|
|
btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
clear_free_space_tree = 1;
|
|
} else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
|
|
btrfs_warn(fs_info, "free space tree is invalid");
|
|
clear_free_space_tree = 1;
|
|
}
|
|
|
|
if (clear_free_space_tree) {
|
|
btrfs_info(fs_info, "clearing free space tree");
|
|
ret = btrfs_clear_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to clear free space tree: %d", ret);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (btrfs_test_opt(tree_root->fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
btrfs_info(fs_info, "creating free space tree");
|
|
ret = btrfs_create_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create free space tree: %d", ret);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
down_read(&fs_info->cleanup_work_sem);
|
|
if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
|
|
(ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
|
|
ret = btrfs_resume_balance_async(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info, "failed to resume balance: %d", ret);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
|
|
ret = btrfs_resume_dev_replace_async(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info, "failed to resume device replace: %d", ret);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
|
|
btrfs_qgroup_rescan_resume(fs_info);
|
|
|
|
if (!fs_info->uuid_root) {
|
|
btrfs_info(fs_info, "creating UUID tree");
|
|
ret = btrfs_create_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create the UUID tree: %d", ret);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
} else if (btrfs_test_opt(tree_root->fs_info, RESCAN_UUID_TREE) ||
|
|
fs_info->generation !=
|
|
btrfs_super_uuid_tree_generation(disk_super)) {
|
|
btrfs_info(fs_info, "checking UUID tree");
|
|
ret = btrfs_check_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to check the UUID tree: %d", ret);
|
|
close_ctree(tree_root);
|
|
return ret;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
|
|
}
|
|
set_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
|
|
/*
|
|
* backuproot only affect mount behavior, and if open_ctree succeeded,
|
|
* no need to keep the flag
|
|
*/
|
|
btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
|
|
|
|
return 0;
|
|
|
|
fail_qgroup:
|
|
btrfs_free_qgroup_config(fs_info);
|
|
fail_trans_kthread:
|
|
kthread_stop(fs_info->transaction_kthread);
|
|
btrfs_cleanup_transaction(fs_info->tree_root);
|
|
btrfs_free_fs_roots(fs_info);
|
|
fail_cleaner:
|
|
kthread_stop(fs_info->cleaner_kthread);
|
|
|
|
/*
|
|
* make sure we're done with the btree inode before we stop our
|
|
* kthreads
|
|
*/
|
|
filemap_write_and_wait(fs_info->btree_inode->i_mapping);
|
|
|
|
fail_sysfs:
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
|
|
fail_fsdev_sysfs:
|
|
btrfs_sysfs_remove_fsid(fs_info->fs_devices);
|
|
|
|
fail_block_groups:
|
|
btrfs_put_block_group_cache(fs_info);
|
|
btrfs_free_block_groups(fs_info);
|
|
|
|
fail_tree_roots:
|
|
free_root_pointers(fs_info, 1);
|
|
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
|
|
|
|
fail_sb_buffer:
|
|
btrfs_stop_all_workers(fs_info);
|
|
fail_alloc:
|
|
fail_iput:
|
|
btrfs_mapping_tree_free(&fs_info->mapping_tree);
|
|
|
|
iput(fs_info->btree_inode);
|
|
fail_bio_counter:
|
|
percpu_counter_destroy(&fs_info->bio_counter);
|
|
fail_delalloc_bytes:
|
|
percpu_counter_destroy(&fs_info->delalloc_bytes);
|
|
fail_dirty_metadata_bytes:
|
|
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
|
|
fail_bdi:
|
|
bdi_destroy(&fs_info->bdi);
|
|
fail_srcu:
|
|
cleanup_srcu_struct(&fs_info->subvol_srcu);
|
|
fail:
|
|
btrfs_free_stripe_hash_table(fs_info);
|
|
btrfs_close_devices(fs_info->fs_devices);
|
|
return err;
|
|
|
|
recovery_tree_root:
|
|
if (!btrfs_test_opt(tree_root->fs_info, USEBACKUPROOT))
|
|
goto fail_tree_roots;
|
|
|
|
free_root_pointers(fs_info, 0);
|
|
|
|
/* don't use the log in recovery mode, it won't be valid */
|
|
btrfs_set_super_log_root(disk_super, 0);
|
|
|
|
/* we can't trust the free space cache either */
|
|
btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
|
|
|
|
ret = next_root_backup(fs_info, fs_info->super_copy,
|
|
&num_backups_tried, &backup_index);
|
|
if (ret == -1)
|
|
goto fail_block_groups;
|
|
goto retry_root_backup;
|
|
}
|
|
|
|
static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
|
|
{
|
|
if (uptodate) {
|
|
set_buffer_uptodate(bh);
|
|
} else {
|
|
struct btrfs_device *device = (struct btrfs_device *)
|
|
bh->b_private;
|
|
|
|
btrfs_warn_rl_in_rcu(device->dev_root->fs_info,
|
|
"lost page write due to IO error on %s",
|
|
rcu_str_deref(device->name));
|
|
/* note, we don't set_buffer_write_io_error because we have
|
|
* our own ways of dealing with the IO errors
|
|
*/
|
|
clear_buffer_uptodate(bh);
|
|
btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
|
|
}
|
|
unlock_buffer(bh);
|
|
put_bh(bh);
|
|
}
|
|
|
|
int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
|
|
struct buffer_head **bh_ret)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct btrfs_super_block *super;
|
|
u64 bytenr;
|
|
|
|
bytenr = btrfs_sb_offset(copy_num);
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
|
|
return -EINVAL;
|
|
|
|
bh = __bread(bdev, bytenr / 4096, BTRFS_SUPER_INFO_SIZE);
|
|
/*
|
|
* If we fail to read from the underlying devices, as of now
|
|
* the best option we have is to mark it EIO.
|
|
*/
|
|
if (!bh)
|
|
return -EIO;
|
|
|
|
super = (struct btrfs_super_block *)bh->b_data;
|
|
if (btrfs_super_bytenr(super) != bytenr ||
|
|
btrfs_super_magic(super) != BTRFS_MAGIC) {
|
|
brelse(bh);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*bh_ret = bh;
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct buffer_head *latest = NULL;
|
|
struct btrfs_super_block *super;
|
|
int i;
|
|
u64 transid = 0;
|
|
int ret = -EINVAL;
|
|
|
|
/* we would like to check all the supers, but that would make
|
|
* a btrfs mount succeed after a mkfs from a different FS.
|
|
* So, we need to add a special mount option to scan for
|
|
* later supers, using BTRFS_SUPER_MIRROR_MAX instead
|
|
*/
|
|
for (i = 0; i < 1; i++) {
|
|
ret = btrfs_read_dev_one_super(bdev, i, &bh);
|
|
if (ret)
|
|
continue;
|
|
|
|
super = (struct btrfs_super_block *)bh->b_data;
|
|
|
|
if (!latest || btrfs_super_generation(super) > transid) {
|
|
brelse(latest);
|
|
latest = bh;
|
|
transid = btrfs_super_generation(super);
|
|
} else {
|
|
brelse(bh);
|
|
}
|
|
}
|
|
|
|
if (!latest)
|
|
return ERR_PTR(ret);
|
|
|
|
return latest;
|
|
}
|
|
|
|
/*
|
|
* this should be called twice, once with wait == 0 and
|
|
* once with wait == 1. When wait == 0 is done, all the buffer heads
|
|
* we write are pinned.
|
|
*
|
|
* They are released when wait == 1 is done.
|
|
* max_mirrors must be the same for both runs, and it indicates how
|
|
* many supers on this one device should be written.
|
|
*
|
|
* max_mirrors == 0 means to write them all.
|
|
*/
|
|
static int write_dev_supers(struct btrfs_device *device,
|
|
struct btrfs_super_block *sb,
|
|
int do_barriers, int wait, int max_mirrors)
|
|
{
|
|
struct buffer_head *bh;
|
|
int i;
|
|
int ret;
|
|
int errors = 0;
|
|
u32 crc;
|
|
u64 bytenr;
|
|
|
|
if (max_mirrors == 0)
|
|
max_mirrors = BTRFS_SUPER_MIRROR_MAX;
|
|
|
|
for (i = 0; i < max_mirrors; i++) {
|
|
bytenr = btrfs_sb_offset(i);
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >=
|
|
device->commit_total_bytes)
|
|
break;
|
|
|
|
if (wait) {
|
|
bh = __find_get_block(device->bdev, bytenr / 4096,
|
|
BTRFS_SUPER_INFO_SIZE);
|
|
if (!bh) {
|
|
errors++;
|
|
continue;
|
|
}
|
|
wait_on_buffer(bh);
|
|
if (!buffer_uptodate(bh))
|
|
errors++;
|
|
|
|
/* drop our reference */
|
|
brelse(bh);
|
|
|
|
/* drop the reference from the wait == 0 run */
|
|
brelse(bh);
|
|
continue;
|
|
} else {
|
|
btrfs_set_super_bytenr(sb, bytenr);
|
|
|
|
crc = ~(u32)0;
|
|
crc = btrfs_csum_data((char *)sb +
|
|
BTRFS_CSUM_SIZE, crc,
|
|
BTRFS_SUPER_INFO_SIZE -
|
|
BTRFS_CSUM_SIZE);
|
|
btrfs_csum_final(crc, sb->csum);
|
|
|
|
/*
|
|
* one reference for us, and we leave it for the
|
|
* caller
|
|
*/
|
|
bh = __getblk(device->bdev, bytenr / 4096,
|
|
BTRFS_SUPER_INFO_SIZE);
|
|
if (!bh) {
|
|
btrfs_err(device->dev_root->fs_info,
|
|
"couldn't get super buffer head for bytenr %llu",
|
|
bytenr);
|
|
errors++;
|
|
continue;
|
|
}
|
|
|
|
memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
|
|
|
|
/* one reference for submit_bh */
|
|
get_bh(bh);
|
|
|
|
set_buffer_uptodate(bh);
|
|
lock_buffer(bh);
|
|
bh->b_end_io = btrfs_end_buffer_write_sync;
|
|
bh->b_private = device;
|
|
}
|
|
|
|
/*
|
|
* we fua the first super. The others we allow
|
|
* to go down lazy.
|
|
*/
|
|
if (i == 0)
|
|
ret = btrfsic_submit_bh(REQ_OP_WRITE, WRITE_FUA, bh);
|
|
else
|
|
ret = btrfsic_submit_bh(REQ_OP_WRITE, WRITE_SYNC, bh);
|
|
if (ret)
|
|
errors++;
|
|
}
|
|
return errors < i ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* endio for the write_dev_flush, this will wake anyone waiting
|
|
* for the barrier when it is done
|
|
*/
|
|
static void btrfs_end_empty_barrier(struct bio *bio)
|
|
{
|
|
if (bio->bi_private)
|
|
complete(bio->bi_private);
|
|
bio_put(bio);
|
|
}
|
|
|
|
/*
|
|
* trigger flushes for one the devices. If you pass wait == 0, the flushes are
|
|
* sent down. With wait == 1, it waits for the previous flush.
|
|
*
|
|
* any device where the flush fails with eopnotsupp are flagged as not-barrier
|
|
* capable
|
|
*/
|
|
static int write_dev_flush(struct btrfs_device *device, int wait)
|
|
{
|
|
struct bio *bio;
|
|
int ret = 0;
|
|
|
|
if (device->nobarriers)
|
|
return 0;
|
|
|
|
if (wait) {
|
|
bio = device->flush_bio;
|
|
if (!bio)
|
|
return 0;
|
|
|
|
wait_for_completion(&device->flush_wait);
|
|
|
|
if (bio->bi_error) {
|
|
ret = bio->bi_error;
|
|
btrfs_dev_stat_inc_and_print(device,
|
|
BTRFS_DEV_STAT_FLUSH_ERRS);
|
|
}
|
|
|
|
/* drop the reference from the wait == 0 run */
|
|
bio_put(bio);
|
|
device->flush_bio = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* one reference for us, and we leave it for the
|
|
* caller
|
|
*/
|
|
device->flush_bio = NULL;
|
|
bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
|
|
if (!bio)
|
|
return -ENOMEM;
|
|
|
|
bio->bi_end_io = btrfs_end_empty_barrier;
|
|
bio->bi_bdev = device->bdev;
|
|
bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH);
|
|
init_completion(&device->flush_wait);
|
|
bio->bi_private = &device->flush_wait;
|
|
device->flush_bio = bio;
|
|
|
|
bio_get(bio);
|
|
btrfsic_submit_bio(bio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* send an empty flush down to each device in parallel,
|
|
* then wait for them
|
|
*/
|
|
static int barrier_all_devices(struct btrfs_fs_info *info)
|
|
{
|
|
struct list_head *head;
|
|
struct btrfs_device *dev;
|
|
int errors_send = 0;
|
|
int errors_wait = 0;
|
|
int ret;
|
|
|
|
/* send down all the barriers */
|
|
head = &info->fs_devices->devices;
|
|
list_for_each_entry_rcu(dev, head, dev_list) {
|
|
if (dev->missing)
|
|
continue;
|
|
if (!dev->bdev) {
|
|
errors_send++;
|
|
continue;
|
|
}
|
|
if (!dev->in_fs_metadata || !dev->writeable)
|
|
continue;
|
|
|
|
ret = write_dev_flush(dev, 0);
|
|
if (ret)
|
|
errors_send++;
|
|
}
|
|
|
|
/* wait for all the barriers */
|
|
list_for_each_entry_rcu(dev, head, dev_list) {
|
|
if (dev->missing)
|
|
continue;
|
|
if (!dev->bdev) {
|
|
errors_wait++;
|
|
continue;
|
|
}
|
|
if (!dev->in_fs_metadata || !dev->writeable)
|
|
continue;
|
|
|
|
ret = write_dev_flush(dev, 1);
|
|
if (ret)
|
|
errors_wait++;
|
|
}
|
|
if (errors_send > info->num_tolerated_disk_barrier_failures ||
|
|
errors_wait > info->num_tolerated_disk_barrier_failures)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
|
|
{
|
|
int raid_type;
|
|
int min_tolerated = INT_MAX;
|
|
|
|
if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
|
|
(flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
|
|
min_tolerated = min(min_tolerated,
|
|
btrfs_raid_array[BTRFS_RAID_SINGLE].
|
|
tolerated_failures);
|
|
|
|
for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
|
|
if (raid_type == BTRFS_RAID_SINGLE)
|
|
continue;
|
|
if (!(flags & btrfs_raid_group[raid_type]))
|
|
continue;
|
|
min_tolerated = min(min_tolerated,
|
|
btrfs_raid_array[raid_type].
|
|
tolerated_failures);
|
|
}
|
|
|
|
if (min_tolerated == INT_MAX) {
|
|
pr_warn("BTRFS: unknown raid flag: %llu", flags);
|
|
min_tolerated = 0;
|
|
}
|
|
|
|
return min_tolerated;
|
|
}
|
|
|
|
int btrfs_calc_num_tolerated_disk_barrier_failures(
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_ioctl_space_info space;
|
|
struct btrfs_space_info *sinfo;
|
|
u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
|
|
BTRFS_BLOCK_GROUP_SYSTEM,
|
|
BTRFS_BLOCK_GROUP_METADATA,
|
|
BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
|
|
int i;
|
|
int c;
|
|
int num_tolerated_disk_barrier_failures =
|
|
(int)fs_info->fs_devices->num_devices;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(types); i++) {
|
|
struct btrfs_space_info *tmp;
|
|
|
|
sinfo = NULL;
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(tmp, &fs_info->space_info, list) {
|
|
if (tmp->flags == types[i]) {
|
|
sinfo = tmp;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (!sinfo)
|
|
continue;
|
|
|
|
down_read(&sinfo->groups_sem);
|
|
for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
|
|
u64 flags;
|
|
|
|
if (list_empty(&sinfo->block_groups[c]))
|
|
continue;
|
|
|
|
btrfs_get_block_group_info(&sinfo->block_groups[c],
|
|
&space);
|
|
if (space.total_bytes == 0 || space.used_bytes == 0)
|
|
continue;
|
|
flags = space.flags;
|
|
|
|
num_tolerated_disk_barrier_failures = min(
|
|
num_tolerated_disk_barrier_failures,
|
|
btrfs_get_num_tolerated_disk_barrier_failures(
|
|
flags));
|
|
}
|
|
up_read(&sinfo->groups_sem);
|
|
}
|
|
|
|
return num_tolerated_disk_barrier_failures;
|
|
}
|
|
|
|
static int write_all_supers(struct btrfs_root *root, int max_mirrors)
|
|
{
|
|
struct list_head *head;
|
|
struct btrfs_device *dev;
|
|
struct btrfs_super_block *sb;
|
|
struct btrfs_dev_item *dev_item;
|
|
int ret;
|
|
int do_barriers;
|
|
int max_errors;
|
|
int total_errors = 0;
|
|
u64 flags;
|
|
|
|
do_barriers = !btrfs_test_opt(root->fs_info, NOBARRIER);
|
|
backup_super_roots(root->fs_info);
|
|
|
|
sb = root->fs_info->super_for_commit;
|
|
dev_item = &sb->dev_item;
|
|
|
|
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
|
|
head = &root->fs_info->fs_devices->devices;
|
|
max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1;
|
|
|
|
if (do_barriers) {
|
|
ret = barrier_all_devices(root->fs_info);
|
|
if (ret) {
|
|
mutex_unlock(
|
|
&root->fs_info->fs_devices->device_list_mutex);
|
|
btrfs_handle_fs_error(root->fs_info, ret,
|
|
"errors while submitting device barriers.");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry_rcu(dev, head, dev_list) {
|
|
if (!dev->bdev) {
|
|
total_errors++;
|
|
continue;
|
|
}
|
|
if (!dev->in_fs_metadata || !dev->writeable)
|
|
continue;
|
|
|
|
btrfs_set_stack_device_generation(dev_item, 0);
|
|
btrfs_set_stack_device_type(dev_item, dev->type);
|
|
btrfs_set_stack_device_id(dev_item, dev->devid);
|
|
btrfs_set_stack_device_total_bytes(dev_item,
|
|
dev->commit_total_bytes);
|
|
btrfs_set_stack_device_bytes_used(dev_item,
|
|
dev->commit_bytes_used);
|
|
btrfs_set_stack_device_io_align(dev_item, dev->io_align);
|
|
btrfs_set_stack_device_io_width(dev_item, dev->io_width);
|
|
btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
|
|
memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
|
|
memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
|
|
|
|
flags = btrfs_super_flags(sb);
|
|
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
|
|
|
|
ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
|
|
if (ret)
|
|
total_errors++;
|
|
}
|
|
if (total_errors > max_errors) {
|
|
btrfs_err(root->fs_info, "%d errors while writing supers",
|
|
total_errors);
|
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
|
|
|
/* FUA is masked off if unsupported and can't be the reason */
|
|
btrfs_handle_fs_error(root->fs_info, -EIO,
|
|
"%d errors while writing supers", total_errors);
|
|
return -EIO;
|
|
}
|
|
|
|
total_errors = 0;
|
|
list_for_each_entry_rcu(dev, head, dev_list) {
|
|
if (!dev->bdev)
|
|
continue;
|
|
if (!dev->in_fs_metadata || !dev->writeable)
|
|
continue;
|
|
|
|
ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
|
|
if (ret)
|
|
total_errors++;
|
|
}
|
|
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
|
|
if (total_errors > max_errors) {
|
|
btrfs_handle_fs_error(root->fs_info, -EIO,
|
|
"%d errors while writing supers", total_errors);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int write_ctree_super(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, int max_mirrors)
|
|
{
|
|
return write_all_supers(root, max_mirrors);
|
|
}
|
|
|
|
/* Drop a fs root from the radix tree and free it. */
|
|
void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root)
|
|
{
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
radix_tree_delete(&fs_info->fs_roots_radix,
|
|
(unsigned long)root->root_key.objectid);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
if (btrfs_root_refs(&root->root_item) == 0)
|
|
synchronize_srcu(&fs_info->subvol_srcu);
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
|
|
btrfs_free_log(NULL, root);
|
|
if (root->reloc_root) {
|
|
free_extent_buffer(root->reloc_root->node);
|
|
free_extent_buffer(root->reloc_root->commit_root);
|
|
btrfs_put_fs_root(root->reloc_root);
|
|
root->reloc_root = NULL;
|
|
}
|
|
}
|
|
|
|
if (root->free_ino_pinned)
|
|
__btrfs_remove_free_space_cache(root->free_ino_pinned);
|
|
if (root->free_ino_ctl)
|
|
__btrfs_remove_free_space_cache(root->free_ino_ctl);
|
|
free_fs_root(root);
|
|
}
|
|
|
|
static void free_fs_root(struct btrfs_root *root)
|
|
{
|
|
iput(root->ino_cache_inode);
|
|
WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
|
|
btrfs_free_block_rsv(root, root->orphan_block_rsv);
|
|
root->orphan_block_rsv = NULL;
|
|
if (root->anon_dev)
|
|
free_anon_bdev(root->anon_dev);
|
|
if (root->subv_writers)
|
|
btrfs_free_subvolume_writers(root->subv_writers);
|
|
free_extent_buffer(root->node);
|
|
free_extent_buffer(root->commit_root);
|
|
kfree(root->free_ino_ctl);
|
|
kfree(root->free_ino_pinned);
|
|
kfree(root->name);
|
|
btrfs_put_fs_root(root);
|
|
}
|
|
|
|
void btrfs_free_fs_root(struct btrfs_root *root)
|
|
{
|
|
free_fs_root(root);
|
|
}
|
|
|
|
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
u64 root_objectid = 0;
|
|
struct btrfs_root *gang[8];
|
|
int i = 0;
|
|
int err = 0;
|
|
unsigned int ret = 0;
|
|
int index;
|
|
|
|
while (1) {
|
|
index = srcu_read_lock(&fs_info->subvol_srcu);
|
|
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, root_objectid,
|
|
ARRAY_SIZE(gang));
|
|
if (!ret) {
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
break;
|
|
}
|
|
root_objectid = gang[ret - 1]->root_key.objectid + 1;
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
/* Avoid to grab roots in dead_roots */
|
|
if (btrfs_root_refs(&gang[i]->root_item) == 0) {
|
|
gang[i] = NULL;
|
|
continue;
|
|
}
|
|
/* grab all the search result for later use */
|
|
gang[i] = btrfs_grab_fs_root(gang[i]);
|
|
}
|
|
srcu_read_unlock(&fs_info->subvol_srcu, index);
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
if (!gang[i])
|
|
continue;
|
|
root_objectid = gang[i]->root_key.objectid;
|
|
err = btrfs_orphan_cleanup(gang[i]);
|
|
if (err)
|
|
break;
|
|
btrfs_put_fs_root(gang[i]);
|
|
}
|
|
root_objectid++;
|
|
}
|
|
|
|
/* release the uncleaned roots due to error */
|
|
for (; i < ret; i++) {
|
|
if (gang[i])
|
|
btrfs_put_fs_root(gang[i]);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int btrfs_commit_super(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
mutex_lock(&root->fs_info->cleaner_mutex);
|
|
btrfs_run_delayed_iputs(root);
|
|
mutex_unlock(&root->fs_info->cleaner_mutex);
|
|
wake_up_process(root->fs_info->cleaner_kthread);
|
|
|
|
/* wait until ongoing cleanup work done */
|
|
down_write(&root->fs_info->cleanup_work_sem);
|
|
up_write(&root->fs_info->cleanup_work_sem);
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
return btrfs_commit_transaction(trans, root);
|
|
}
|
|
|
|
void close_ctree(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
|
|
|
|
/* wait for the qgroup rescan worker to stop */
|
|
btrfs_qgroup_wait_for_completion(fs_info, false);
|
|
|
|
/* wait for the uuid_scan task to finish */
|
|
down(&fs_info->uuid_tree_rescan_sem);
|
|
/* avoid complains from lockdep et al., set sem back to initial state */
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
|
|
/* pause restriper - we want to resume on mount */
|
|
btrfs_pause_balance(fs_info);
|
|
|
|
btrfs_dev_replace_suspend_for_unmount(fs_info);
|
|
|
|
btrfs_scrub_cancel(fs_info);
|
|
|
|
/* wait for any defraggers to finish */
|
|
wait_event(fs_info->transaction_wait,
|
|
(atomic_read(&fs_info->defrag_running) == 0));
|
|
|
|
/* clear out the rbtree of defraggable inodes */
|
|
btrfs_cleanup_defrag_inodes(fs_info);
|
|
|
|
cancel_work_sync(&fs_info->async_reclaim_work);
|
|
|
|
if (!(fs_info->sb->s_flags & MS_RDONLY)) {
|
|
/*
|
|
* If the cleaner thread is stopped and there are
|
|
* block groups queued for removal, the deletion will be
|
|
* skipped when we quit the cleaner thread.
|
|
*/
|
|
btrfs_delete_unused_bgs(root->fs_info);
|
|
|
|
ret = btrfs_commit_super(root);
|
|
if (ret)
|
|
btrfs_err(fs_info, "commit super ret %d", ret);
|
|
}
|
|
|
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
|
|
btrfs_error_commit_super(root);
|
|
|
|
kthread_stop(fs_info->transaction_kthread);
|
|
kthread_stop(fs_info->cleaner_kthread);
|
|
|
|
set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
|
|
|
|
btrfs_free_qgroup_config(fs_info);
|
|
|
|
if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
|
|
btrfs_info(fs_info, "at unmount delalloc count %lld",
|
|
percpu_counter_sum(&fs_info->delalloc_bytes));
|
|
}
|
|
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
btrfs_sysfs_remove_fsid(fs_info->fs_devices);
|
|
|
|
btrfs_free_fs_roots(fs_info);
|
|
|
|
btrfs_put_block_group_cache(fs_info);
|
|
|
|
btrfs_free_block_groups(fs_info);
|
|
|
|
/*
|
|
* we must make sure there is not any read request to
|
|
* submit after we stopping all workers.
|
|
*/
|
|
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
|
|
btrfs_stop_all_workers(fs_info);
|
|
|
|
clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
free_root_pointers(fs_info, 1);
|
|
|
|
iput(fs_info->btree_inode);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
if (btrfs_test_opt(root->fs_info, CHECK_INTEGRITY))
|
|
btrfsic_unmount(root, fs_info->fs_devices);
|
|
#endif
|
|
|
|
btrfs_close_devices(fs_info->fs_devices);
|
|
btrfs_mapping_tree_free(&fs_info->mapping_tree);
|
|
|
|
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
|
|
percpu_counter_destroy(&fs_info->delalloc_bytes);
|
|
percpu_counter_destroy(&fs_info->bio_counter);
|
|
bdi_destroy(&fs_info->bdi);
|
|
cleanup_srcu_struct(&fs_info->subvol_srcu);
|
|
|
|
btrfs_free_stripe_hash_table(fs_info);
|
|
|
|
__btrfs_free_block_rsv(root->orphan_block_rsv);
|
|
root->orphan_block_rsv = NULL;
|
|
|
|
lock_chunks(root);
|
|
while (!list_empty(&fs_info->pinned_chunks)) {
|
|
struct extent_map *em;
|
|
|
|
em = list_first_entry(&fs_info->pinned_chunks,
|
|
struct extent_map, list);
|
|
list_del_init(&em->list);
|
|
free_extent_map(em);
|
|
}
|
|
unlock_chunks(root);
|
|
}
|
|
|
|
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
|
|
int atomic)
|
|
{
|
|
int ret;
|
|
struct inode *btree_inode = buf->pages[0]->mapping->host;
|
|
|
|
ret = extent_buffer_uptodate(buf);
|
|
if (!ret)
|
|
return ret;
|
|
|
|
ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
|
|
parent_transid, atomic);
|
|
if (ret == -EAGAIN)
|
|
return ret;
|
|
return !ret;
|
|
}
|
|
|
|
void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
|
|
{
|
|
struct btrfs_root *root;
|
|
u64 transid = btrfs_header_generation(buf);
|
|
int was_dirty;
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
/*
|
|
* This is a fast path so only do this check if we have sanity tests
|
|
* enabled. Normal people shouldn't be marking dummy buffers as dirty
|
|
* outside of the sanity tests.
|
|
*/
|
|
if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags)))
|
|
return;
|
|
#endif
|
|
root = BTRFS_I(buf->pages[0]->mapping->host)->root;
|
|
btrfs_assert_tree_locked(buf);
|
|
if (transid != root->fs_info->generation)
|
|
WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
|
|
buf->start, transid, root->fs_info->generation);
|
|
was_dirty = set_extent_buffer_dirty(buf);
|
|
if (!was_dirty)
|
|
__percpu_counter_add(&root->fs_info->dirty_metadata_bytes,
|
|
buf->len,
|
|
root->fs_info->dirty_metadata_batch);
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) {
|
|
btrfs_print_leaf(root, buf);
|
|
ASSERT(0);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void __btrfs_btree_balance_dirty(struct btrfs_root *root,
|
|
int flush_delayed)
|
|
{
|
|
/*
|
|
* looks as though older kernels can get into trouble with
|
|
* this code, they end up stuck in balance_dirty_pages forever
|
|
*/
|
|
int ret;
|
|
|
|
if (current->flags & PF_MEMALLOC)
|
|
return;
|
|
|
|
if (flush_delayed)
|
|
btrfs_balance_delayed_items(root);
|
|
|
|
ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes,
|
|
BTRFS_DIRTY_METADATA_THRESH);
|
|
if (ret > 0) {
|
|
balance_dirty_pages_ratelimited(
|
|
root->fs_info->btree_inode->i_mapping);
|
|
}
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty(struct btrfs_root *root)
|
|
{
|
|
__btrfs_btree_balance_dirty(root, 1);
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root)
|
|
{
|
|
__btrfs_btree_balance_dirty(root, 0);
|
|
}
|
|
|
|
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
|
|
{
|
|
struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
|
|
return btree_read_extent_buffer_pages(root, buf, parent_transid);
|
|
}
|
|
|
|
static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
|
|
int read_only)
|
|
{
|
|
struct btrfs_super_block *sb = fs_info->super_copy;
|
|
u64 nodesize = btrfs_super_nodesize(sb);
|
|
u64 sectorsize = btrfs_super_sectorsize(sb);
|
|
int ret = 0;
|
|
|
|
if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
|
|
btrfs_err(fs_info, "no valid FS found");
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP)
|
|
btrfs_warn(fs_info, "unrecognized super flag: %llu",
|
|
btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
|
|
if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "tree_root level too big: %d >= %d",
|
|
btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
|
|
btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "log_root level too big: %d >= %d",
|
|
btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Check sectorsize and nodesize first, other check will need it.
|
|
* Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
|
|
*/
|
|
if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
|
|
sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
|
|
ret = -EINVAL;
|
|
}
|
|
/* Only PAGE SIZE is supported yet */
|
|
if (sectorsize != PAGE_SIZE) {
|
|
btrfs_err(fs_info,
|
|
"sectorsize %llu not supported yet, only support %lu",
|
|
sectorsize, PAGE_SIZE);
|
|
ret = -EINVAL;
|
|
}
|
|
if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
|
|
nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
|
|
ret = -EINVAL;
|
|
}
|
|
if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
|
|
btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
|
|
le32_to_cpu(sb->__unused_leafsize), nodesize);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* Root alignment check */
|
|
if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "tree_root block unaligned: %llu",
|
|
btrfs_super_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
|
|
btrfs_super_chunk_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "log_root block unaligned: %llu",
|
|
btrfs_super_log_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
|
|
btrfs_err(fs_info,
|
|
"dev_item UUID does not match fsid: %pU != %pU",
|
|
fs_info->fsid, sb->dev_item.fsid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Hint to catch really bogus numbers, bitflips or so, more exact checks are
|
|
* done later
|
|
*/
|
|
if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
|
|
btrfs_err(fs_info, "bytes_used is too small %llu",
|
|
btrfs_super_bytes_used(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!is_power_of_2(btrfs_super_stripesize(sb))) {
|
|
btrfs_err(fs_info, "invalid stripesize %u",
|
|
btrfs_super_stripesize(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_num_devices(sb) > (1UL << 31))
|
|
btrfs_warn(fs_info, "suspicious number of devices: %llu",
|
|
btrfs_super_num_devices(sb));
|
|
if (btrfs_super_num_devices(sb) == 0) {
|
|
btrfs_err(fs_info, "number of devices is 0");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) {
|
|
btrfs_err(fs_info, "super offset mismatch %llu != %u",
|
|
btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Obvious sys_chunk_array corruptions, it must hold at least one key
|
|
* and one chunk
|
|
*/
|
|
if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
|
|
btrfs_err(fs_info, "system chunk array too big %u > %u",
|
|
btrfs_super_sys_array_size(sb),
|
|
BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
|
|
+ sizeof(struct btrfs_chunk)) {
|
|
btrfs_err(fs_info, "system chunk array too small %u < %zu",
|
|
btrfs_super_sys_array_size(sb),
|
|
sizeof(struct btrfs_disk_key)
|
|
+ sizeof(struct btrfs_chunk));
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* The generation is a global counter, we'll trust it more than the others
|
|
* but it's still possible that it's the one that's wrong.
|
|
*/
|
|
if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
|
|
btrfs_warn(fs_info,
|
|
"suspicious: generation < chunk_root_generation: %llu < %llu",
|
|
btrfs_super_generation(sb),
|
|
btrfs_super_chunk_root_generation(sb));
|
|
if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
|
|
&& btrfs_super_cache_generation(sb) != (u64)-1)
|
|
btrfs_warn(fs_info,
|
|
"suspicious: generation < cache_generation: %llu < %llu",
|
|
btrfs_super_generation(sb),
|
|
btrfs_super_cache_generation(sb));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_error_commit_super(struct btrfs_root *root)
|
|
{
|
|
mutex_lock(&root->fs_info->cleaner_mutex);
|
|
btrfs_run_delayed_iputs(root);
|
|
mutex_unlock(&root->fs_info->cleaner_mutex);
|
|
|
|
down_write(&root->fs_info->cleanup_work_sem);
|
|
up_write(&root->fs_info->cleanup_work_sem);
|
|
|
|
/* cleanup FS via transaction */
|
|
btrfs_cleanup_transaction(root);
|
|
}
|
|
|
|
static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
spin_lock(&root->ordered_extent_lock);
|
|
/*
|
|
* This will just short circuit the ordered completion stuff which will
|
|
* make sure the ordered extent gets properly cleaned up.
|
|
*/
|
|
list_for_each_entry(ordered, &root->ordered_extents,
|
|
root_extent_list)
|
|
set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
|
|
spin_unlock(&root->ordered_extent_lock);
|
|
}
|
|
|
|
static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct list_head splice;
|
|
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
list_splice_init(&fs_info->ordered_roots, &splice);
|
|
while (!list_empty(&splice)) {
|
|
root = list_first_entry(&splice, struct btrfs_root,
|
|
ordered_root);
|
|
list_move_tail(&root->ordered_root,
|
|
&fs_info->ordered_roots);
|
|
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
btrfs_destroy_ordered_extents(root);
|
|
|
|
cond_resched();
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
}
|
|
|
|
static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct rb_node *node;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct btrfs_delayed_ref_node *ref;
|
|
int ret = 0;
|
|
|
|
delayed_refs = &trans->delayed_refs;
|
|
|
|
spin_lock(&delayed_refs->lock);
|
|
if (atomic_read(&delayed_refs->num_entries) == 0) {
|
|
spin_unlock(&delayed_refs->lock);
|
|
btrfs_info(root->fs_info, "delayed_refs has NO entry");
|
|
return ret;
|
|
}
|
|
|
|
while ((node = rb_first(&delayed_refs->href_root)) != NULL) {
|
|
struct btrfs_delayed_ref_head *head;
|
|
struct btrfs_delayed_ref_node *tmp;
|
|
bool pin_bytes = false;
|
|
|
|
head = rb_entry(node, struct btrfs_delayed_ref_head,
|
|
href_node);
|
|
if (!mutex_trylock(&head->mutex)) {
|
|
atomic_inc(&head->node.refs);
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
mutex_lock(&head->mutex);
|
|
mutex_unlock(&head->mutex);
|
|
btrfs_put_delayed_ref(&head->node);
|
|
spin_lock(&delayed_refs->lock);
|
|
continue;
|
|
}
|
|
spin_lock(&head->lock);
|
|
list_for_each_entry_safe_reverse(ref, tmp, &head->ref_list,
|
|
list) {
|
|
ref->in_tree = 0;
|
|
list_del(&ref->list);
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
btrfs_put_delayed_ref(ref);
|
|
}
|
|
if (head->must_insert_reserved)
|
|
pin_bytes = true;
|
|
btrfs_free_delayed_extent_op(head->extent_op);
|
|
delayed_refs->num_heads--;
|
|
if (head->processing == 0)
|
|
delayed_refs->num_heads_ready--;
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
head->node.in_tree = 0;
|
|
rb_erase(&head->href_node, &delayed_refs->href_root);
|
|
spin_unlock(&head->lock);
|
|
spin_unlock(&delayed_refs->lock);
|
|
mutex_unlock(&head->mutex);
|
|
|
|
if (pin_bytes)
|
|
btrfs_pin_extent(root, head->node.bytenr,
|
|
head->node.num_bytes, 1);
|
|
btrfs_put_delayed_ref(&head->node);
|
|
cond_resched();
|
|
spin_lock(&delayed_refs->lock);
|
|
}
|
|
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_inode *btrfs_inode;
|
|
struct list_head splice;
|
|
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
spin_lock(&root->delalloc_lock);
|
|
list_splice_init(&root->delalloc_inodes, &splice);
|
|
|
|
while (!list_empty(&splice)) {
|
|
btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
|
|
delalloc_inodes);
|
|
|
|
list_del_init(&btrfs_inode->delalloc_inodes);
|
|
clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
|
|
&btrfs_inode->runtime_flags);
|
|
spin_unlock(&root->delalloc_lock);
|
|
|
|
btrfs_invalidate_inodes(btrfs_inode->root);
|
|
|
|
spin_lock(&root->delalloc_lock);
|
|
}
|
|
|
|
spin_unlock(&root->delalloc_lock);
|
|
}
|
|
|
|
static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct list_head splice;
|
|
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
list_splice_init(&fs_info->delalloc_roots, &splice);
|
|
while (!list_empty(&splice)) {
|
|
root = list_first_entry(&splice, struct btrfs_root,
|
|
delalloc_root);
|
|
list_del_init(&root->delalloc_root);
|
|
root = btrfs_grab_fs_root(root);
|
|
BUG_ON(!root);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
|
|
btrfs_destroy_delalloc_inodes(root);
|
|
btrfs_put_fs_root(root);
|
|
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
}
|
|
|
|
static int btrfs_destroy_marked_extents(struct btrfs_root *root,
|
|
struct extent_io_tree *dirty_pages,
|
|
int mark)
|
|
{
|
|
int ret;
|
|
struct extent_buffer *eb;
|
|
u64 start = 0;
|
|
u64 end;
|
|
|
|
while (1) {
|
|
ret = find_first_extent_bit(dirty_pages, start, &start, &end,
|
|
mark, NULL);
|
|
if (ret)
|
|
break;
|
|
|
|
clear_extent_bits(dirty_pages, start, end, mark);
|
|
while (start <= end) {
|
|
eb = btrfs_find_tree_block(root->fs_info, start);
|
|
start += root->nodesize;
|
|
if (!eb)
|
|
continue;
|
|
wait_on_extent_buffer_writeback(eb);
|
|
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
|
|
&eb->bflags))
|
|
clear_extent_buffer_dirty(eb);
|
|
free_extent_buffer_stale(eb);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
|
|
struct extent_io_tree *pinned_extents)
|
|
{
|
|
struct extent_io_tree *unpin;
|
|
u64 start;
|
|
u64 end;
|
|
int ret;
|
|
bool loop = true;
|
|
|
|
unpin = pinned_extents;
|
|
again:
|
|
while (1) {
|
|
ret = find_first_extent_bit(unpin, 0, &start, &end,
|
|
EXTENT_DIRTY, NULL);
|
|
if (ret)
|
|
break;
|
|
|
|
clear_extent_dirty(unpin, start, end);
|
|
btrfs_error_unpin_extent_range(root, start, end);
|
|
cond_resched();
|
|
}
|
|
|
|
if (loop) {
|
|
if (unpin == &root->fs_info->freed_extents[0])
|
|
unpin = &root->fs_info->freed_extents[1];
|
|
else
|
|
unpin = &root->fs_info->freed_extents[0];
|
|
loop = false;
|
|
goto again;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = cache->io_ctl.inode;
|
|
if (inode) {
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
BTRFS_I(inode)->generation = 0;
|
|
cache->io_ctl.inode = NULL;
|
|
iput(inode);
|
|
}
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_block_group_cache *cache;
|
|
|
|
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);
|
|
if (!cache) {
|
|
btrfs_err(root->fs_info,
|
|
"orphan block group dirty_bgs list");
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
return;
|
|
}
|
|
|
|
if (!list_empty(&cache->io_list)) {
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
list_del_init(&cache->io_list);
|
|
btrfs_cleanup_bg_io(cache);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
|
|
list_del_init(&cache->dirty_list);
|
|
spin_lock(&cache->lock);
|
|
cache->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&cache->lock);
|
|
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
btrfs_put_block_group(cache);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
|
|
while (!list_empty(&cur_trans->io_bgs)) {
|
|
cache = list_first_entry(&cur_trans->io_bgs,
|
|
struct btrfs_block_group_cache,
|
|
io_list);
|
|
if (!cache) {
|
|
btrfs_err(root->fs_info,
|
|
"orphan block group on io_bgs list");
|
|
return;
|
|
}
|
|
|
|
list_del_init(&cache->io_list);
|
|
spin_lock(&cache->lock);
|
|
cache->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&cache->lock);
|
|
btrfs_cleanup_bg_io(cache);
|
|
}
|
|
}
|
|
|
|
void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
btrfs_cleanup_dirty_bgs(cur_trans, root);
|
|
ASSERT(list_empty(&cur_trans->dirty_bgs));
|
|
ASSERT(list_empty(&cur_trans->io_bgs));
|
|
|
|
btrfs_destroy_delayed_refs(cur_trans, root);
|
|
|
|
cur_trans->state = TRANS_STATE_COMMIT_START;
|
|
wake_up(&root->fs_info->transaction_blocked_wait);
|
|
|
|
cur_trans->state = TRANS_STATE_UNBLOCKED;
|
|
wake_up(&root->fs_info->transaction_wait);
|
|
|
|
btrfs_destroy_delayed_inodes(root);
|
|
btrfs_assert_delayed_root_empty(root);
|
|
|
|
btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages,
|
|
EXTENT_DIRTY);
|
|
btrfs_destroy_pinned_extent(root,
|
|
root->fs_info->pinned_extents);
|
|
|
|
cur_trans->state =TRANS_STATE_COMPLETED;
|
|
wake_up(&cur_trans->commit_wait);
|
|
|
|
/*
|
|
memset(cur_trans, 0, sizeof(*cur_trans));
|
|
kmem_cache_free(btrfs_transaction_cachep, cur_trans);
|
|
*/
|
|
}
|
|
|
|
static int btrfs_cleanup_transaction(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_transaction *t;
|
|
|
|
mutex_lock(&root->fs_info->transaction_kthread_mutex);
|
|
|
|
spin_lock(&root->fs_info->trans_lock);
|
|
while (!list_empty(&root->fs_info->trans_list)) {
|
|
t = list_first_entry(&root->fs_info->trans_list,
|
|
struct btrfs_transaction, list);
|
|
if (t->state >= TRANS_STATE_COMMIT_START) {
|
|
atomic_inc(&t->use_count);
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
btrfs_wait_for_commit(root, t->transid);
|
|
btrfs_put_transaction(t);
|
|
spin_lock(&root->fs_info->trans_lock);
|
|
continue;
|
|
}
|
|
if (t == root->fs_info->running_transaction) {
|
|
t->state = TRANS_STATE_COMMIT_DOING;
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
/*
|
|
* We wait for 0 num_writers since we don't hold a trans
|
|
* handle open currently for this transaction.
|
|
*/
|
|
wait_event(t->writer_wait,
|
|
atomic_read(&t->num_writers) == 0);
|
|
} else {
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
}
|
|
btrfs_cleanup_one_transaction(t, root);
|
|
|
|
spin_lock(&root->fs_info->trans_lock);
|
|
if (t == root->fs_info->running_transaction)
|
|
root->fs_info->running_transaction = NULL;
|
|
list_del_init(&t->list);
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
|
|
btrfs_put_transaction(t);
|
|
trace_btrfs_transaction_commit(root);
|
|
spin_lock(&root->fs_info->trans_lock);
|
|
}
|
|
spin_unlock(&root->fs_info->trans_lock);
|
|
btrfs_destroy_all_ordered_extents(root->fs_info);
|
|
btrfs_destroy_delayed_inodes(root);
|
|
btrfs_assert_delayed_root_empty(root);
|
|
btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents);
|
|
btrfs_destroy_all_delalloc_inodes(root->fs_info);
|
|
mutex_unlock(&root->fs_info->transaction_kthread_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct extent_io_ops btree_extent_io_ops = {
|
|
.readpage_end_io_hook = btree_readpage_end_io_hook,
|
|
.readpage_io_failed_hook = btree_io_failed_hook,
|
|
.submit_bio_hook = btree_submit_bio_hook,
|
|
/* note we're sharing with inode.c for the merge bio hook */
|
|
.merge_bio_hook = btrfs_merge_bio_hook,
|
|
};
|