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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Qu Wenruo](/assets/img/avatar_default.png)
Although in btrfs we have very limited usage of PageChecked flag, it's still some page flag not yet subpage compatible. Fix it by introducing btrfs_subpage::checked_offset to do the convert. For most call sites, especially for free-space cache, COW fixup and btrfs_invalidatepage(), they all work in full page mode anyway. For other call sites, they work as subpage compatible mode. Some call sites need extra modification: - btrfs_drop_pages() Needs extra parameter to get the real range we need to clear checked flag. Also since btrfs_drop_pages() will accept pages beyond the dirtied range, update btrfs_subpage_clamp_range() to handle such case by setting @len to 0 if the page is beyond target range. - btrfs_invalidatepage() We need to call subpage helper before calling __btrfs_releasepage(), or it will trigger ASSERT() as page->private will be cleared. - btrfs_verify_data_csum() In theory we don't need the io_bio->csum check anymore, but it's won't hurt. Just change the comment. Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
4170 lines
108 KiB
C
4170 lines
108 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2008 Red Hat. All rights reserved.
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*/
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/math64.h>
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#include <linux/ratelimit.h>
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#include <linux/error-injection.h>
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#include <linux/sched/mm.h>
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#include "misc.h"
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#include "ctree.h"
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#include "free-space-cache.h"
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#include "transaction.h"
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#include "disk-io.h"
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#include "extent_io.h"
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#include "volumes.h"
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#include "space-info.h"
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#include "delalloc-space.h"
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#include "block-group.h"
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#include "discard.h"
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#include "subpage.h"
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#define BITS_PER_BITMAP (PAGE_SIZE * 8UL)
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#define MAX_CACHE_BYTES_PER_GIG SZ_64K
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#define FORCE_EXTENT_THRESHOLD SZ_1M
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struct btrfs_trim_range {
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u64 start;
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u64 bytes;
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struct list_head list;
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};
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static int link_free_space(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *info);
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static void unlink_free_space(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *info);
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static int search_bitmap(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *bitmap_info, u64 *offset,
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u64 *bytes, bool for_alloc);
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static void free_bitmap(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *bitmap_info);
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static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *info, u64 offset,
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u64 bytes);
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static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_path *path,
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u64 offset)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_key key;
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struct btrfs_key location;
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struct btrfs_disk_key disk_key;
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struct btrfs_free_space_header *header;
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struct extent_buffer *leaf;
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struct inode *inode = NULL;
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unsigned nofs_flag;
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int ret;
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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key.offset = offset;
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key.type = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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return ERR_PTR(ret);
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if (ret > 0) {
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btrfs_release_path(path);
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return ERR_PTR(-ENOENT);
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}
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leaf = path->nodes[0];
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header = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_free_space_header);
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btrfs_free_space_key(leaf, header, &disk_key);
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btrfs_disk_key_to_cpu(&location, &disk_key);
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btrfs_release_path(path);
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/*
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* We are often under a trans handle at this point, so we need to make
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* sure NOFS is set to keep us from deadlocking.
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*/
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nofs_flag = memalloc_nofs_save();
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inode = btrfs_iget_path(fs_info->sb, location.objectid, root, path);
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btrfs_release_path(path);
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memalloc_nofs_restore(nofs_flag);
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if (IS_ERR(inode))
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return inode;
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mapping_set_gfp_mask(inode->i_mapping,
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mapping_gfp_constraint(inode->i_mapping,
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~(__GFP_FS | __GFP_HIGHMEM)));
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return inode;
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}
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struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,
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struct btrfs_path *path)
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{
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struct btrfs_fs_info *fs_info = block_group->fs_info;
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struct inode *inode = NULL;
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u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW;
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spin_lock(&block_group->lock);
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if (block_group->inode)
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inode = igrab(block_group->inode);
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spin_unlock(&block_group->lock);
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if (inode)
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return inode;
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inode = __lookup_free_space_inode(fs_info->tree_root, path,
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block_group->start);
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if (IS_ERR(inode))
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return inode;
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spin_lock(&block_group->lock);
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if (!((BTRFS_I(inode)->flags & flags) == flags)) {
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btrfs_info(fs_info, "Old style space inode found, converting.");
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BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM |
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BTRFS_INODE_NODATACOW;
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block_group->disk_cache_state = BTRFS_DC_CLEAR;
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}
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if (!block_group->iref) {
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block_group->inode = igrab(inode);
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block_group->iref = 1;
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}
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spin_unlock(&block_group->lock);
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return inode;
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}
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static int __create_free_space_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path,
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u64 ino, u64 offset)
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{
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struct btrfs_key key;
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struct btrfs_disk_key disk_key;
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struct btrfs_free_space_header *header;
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struct btrfs_inode_item *inode_item;
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struct extent_buffer *leaf;
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/* We inline CRCs for the free disk space cache */
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const u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC |
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BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW;
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int ret;
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ret = btrfs_insert_empty_inode(trans, root, path, ino);
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if (ret)
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return ret;
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leaf = path->nodes[0];
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inode_item = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_inode_item);
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btrfs_item_key(leaf, &disk_key, path->slots[0]);
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memzero_extent_buffer(leaf, (unsigned long)inode_item,
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sizeof(*inode_item));
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btrfs_set_inode_generation(leaf, inode_item, trans->transid);
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btrfs_set_inode_size(leaf, inode_item, 0);
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btrfs_set_inode_nbytes(leaf, inode_item, 0);
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btrfs_set_inode_uid(leaf, inode_item, 0);
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btrfs_set_inode_gid(leaf, inode_item, 0);
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btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600);
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btrfs_set_inode_flags(leaf, inode_item, flags);
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btrfs_set_inode_nlink(leaf, inode_item, 1);
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btrfs_set_inode_transid(leaf, inode_item, trans->transid);
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btrfs_set_inode_block_group(leaf, inode_item, offset);
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btrfs_mark_buffer_dirty(leaf);
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btrfs_release_path(path);
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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key.offset = offset;
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key.type = 0;
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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sizeof(struct btrfs_free_space_header));
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if (ret < 0) {
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btrfs_release_path(path);
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return ret;
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}
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leaf = path->nodes[0];
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header = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_free_space_header);
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memzero_extent_buffer(leaf, (unsigned long)header, sizeof(*header));
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btrfs_set_free_space_key(leaf, header, &disk_key);
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btrfs_mark_buffer_dirty(leaf);
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btrfs_release_path(path);
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return 0;
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}
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int create_free_space_inode(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct btrfs_path *path)
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{
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int ret;
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u64 ino;
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ret = btrfs_get_free_objectid(trans->fs_info->tree_root, &ino);
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if (ret < 0)
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return ret;
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return __create_free_space_inode(trans->fs_info->tree_root, trans, path,
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ino, block_group->start);
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}
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/*
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* inode is an optional sink: if it is NULL, btrfs_remove_free_space_inode
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* handles lookup, otherwise it takes ownership and iputs the inode.
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* Don't reuse an inode pointer after passing it into this function.
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*/
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int btrfs_remove_free_space_inode(struct btrfs_trans_handle *trans,
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struct inode *inode,
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struct btrfs_block_group *block_group)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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int ret = 0;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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if (!inode)
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inode = lookup_free_space_inode(block_group, path);
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if (IS_ERR(inode)) {
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if (PTR_ERR(inode) != -ENOENT)
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ret = PTR_ERR(inode);
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goto out;
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}
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ret = btrfs_orphan_add(trans, BTRFS_I(inode));
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if (ret) {
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btrfs_add_delayed_iput(inode);
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goto out;
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}
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clear_nlink(inode);
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/* One for the block groups ref */
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spin_lock(&block_group->lock);
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if (block_group->iref) {
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block_group->iref = 0;
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block_group->inode = NULL;
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spin_unlock(&block_group->lock);
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iput(inode);
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} else {
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spin_unlock(&block_group->lock);
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}
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/* One for the lookup ref */
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btrfs_add_delayed_iput(inode);
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key.objectid = BTRFS_FREE_SPACE_OBJECTID;
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key.type = 0;
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key.offset = block_group->start;
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ret = btrfs_search_slot(trans, trans->fs_info->tree_root, &key, path,
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-1, 1);
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if (ret) {
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if (ret > 0)
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ret = 0;
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goto out;
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}
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ret = btrfs_del_item(trans, trans->fs_info->tree_root, path);
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out:
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btrfs_free_path(path);
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return ret;
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}
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int btrfs_check_trunc_cache_free_space(struct btrfs_fs_info *fs_info,
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struct btrfs_block_rsv *rsv)
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{
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u64 needed_bytes;
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int ret;
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/* 1 for slack space, 1 for updating the inode */
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needed_bytes = btrfs_calc_insert_metadata_size(fs_info, 1) +
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btrfs_calc_metadata_size(fs_info, 1);
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spin_lock(&rsv->lock);
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if (rsv->reserved < needed_bytes)
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ret = -ENOSPC;
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else
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ret = 0;
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spin_unlock(&rsv->lock);
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return ret;
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}
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int btrfs_truncate_free_space_cache(struct btrfs_trans_handle *trans,
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struct btrfs_block_group *block_group,
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struct inode *inode)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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int ret = 0;
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bool locked = false;
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if (block_group) {
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struct btrfs_path *path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto fail;
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}
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locked = true;
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mutex_lock(&trans->transaction->cache_write_mutex);
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if (!list_empty(&block_group->io_list)) {
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list_del_init(&block_group->io_list);
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btrfs_wait_cache_io(trans, block_group, path);
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btrfs_put_block_group(block_group);
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}
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/*
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* now that we've truncated the cache away, its no longer
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* setup or written
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*/
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spin_lock(&block_group->lock);
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block_group->disk_cache_state = BTRFS_DC_CLEAR;
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spin_unlock(&block_group->lock);
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btrfs_free_path(path);
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}
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btrfs_i_size_write(BTRFS_I(inode), 0);
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truncate_pagecache(inode, 0);
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/*
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* We skip the throttling logic for free space cache inodes, so we don't
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* need to check for -EAGAIN.
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*/
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ret = btrfs_truncate_inode_items(trans, root, BTRFS_I(inode),
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0, BTRFS_EXTENT_DATA_KEY, NULL);
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if (ret)
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goto fail;
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ret = btrfs_update_inode(trans, root, BTRFS_I(inode));
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fail:
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if (locked)
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mutex_unlock(&trans->transaction->cache_write_mutex);
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if (ret)
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btrfs_abort_transaction(trans, ret);
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return ret;
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}
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static void readahead_cache(struct inode *inode)
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{
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struct file_ra_state ra;
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unsigned long last_index;
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file_ra_state_init(&ra, inode->i_mapping);
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last_index = (i_size_read(inode) - 1) >> PAGE_SHIFT;
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page_cache_sync_readahead(inode->i_mapping, &ra, NULL, 0, last_index);
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}
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static int io_ctl_init(struct btrfs_io_ctl *io_ctl, struct inode *inode,
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int write)
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{
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int num_pages;
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num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
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/* Make sure we can fit our crcs and generation into the first page */
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if (write && (num_pages * sizeof(u32) + sizeof(u64)) > PAGE_SIZE)
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return -ENOSPC;
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memset(io_ctl, 0, sizeof(struct btrfs_io_ctl));
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io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS);
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if (!io_ctl->pages)
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return -ENOMEM;
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io_ctl->num_pages = num_pages;
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io_ctl->fs_info = btrfs_sb(inode->i_sb);
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io_ctl->inode = inode;
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return 0;
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}
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ALLOW_ERROR_INJECTION(io_ctl_init, ERRNO);
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static void io_ctl_free(struct btrfs_io_ctl *io_ctl)
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{
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kfree(io_ctl->pages);
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io_ctl->pages = NULL;
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}
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static void io_ctl_unmap_page(struct btrfs_io_ctl *io_ctl)
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{
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if (io_ctl->cur) {
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io_ctl->cur = NULL;
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io_ctl->orig = NULL;
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}
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}
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static void io_ctl_map_page(struct btrfs_io_ctl *io_ctl, int clear)
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{
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ASSERT(io_ctl->index < io_ctl->num_pages);
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io_ctl->page = io_ctl->pages[io_ctl->index++];
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io_ctl->cur = page_address(io_ctl->page);
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io_ctl->orig = io_ctl->cur;
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io_ctl->size = PAGE_SIZE;
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if (clear)
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clear_page(io_ctl->cur);
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}
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|
|
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static void io_ctl_drop_pages(struct btrfs_io_ctl *io_ctl)
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{
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int i;
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io_ctl_unmap_page(io_ctl);
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|
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for (i = 0; i < io_ctl->num_pages; i++) {
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if (io_ctl->pages[i]) {
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btrfs_page_clear_checked(io_ctl->fs_info,
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io_ctl->pages[i],
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page_offset(io_ctl->pages[i]),
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PAGE_SIZE);
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unlock_page(io_ctl->pages[i]);
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put_page(io_ctl->pages[i]);
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}
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}
|
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}
|
|
|
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static int io_ctl_prepare_pages(struct btrfs_io_ctl *io_ctl, bool uptodate)
|
|
{
|
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struct page *page;
|
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struct inode *inode = io_ctl->inode;
|
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gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping);
|
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int i;
|
|
|
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for (i = 0; i < io_ctl->num_pages; i++) {
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int ret;
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|
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page = find_or_create_page(inode->i_mapping, i, mask);
|
|
if (!page) {
|
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io_ctl_drop_pages(io_ctl);
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return -ENOMEM;
|
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}
|
|
|
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ret = set_page_extent_mapped(page);
|
|
if (ret < 0) {
|
|
unlock_page(page);
|
|
put_page(page);
|
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io_ctl_drop_pages(io_ctl);
|
|
return ret;
|
|
}
|
|
|
|
io_ctl->pages[i] = page;
|
|
if (uptodate && !PageUptodate(page)) {
|
|
btrfs_readpage(NULL, page);
|
|
lock_page(page);
|
|
if (page->mapping != inode->i_mapping) {
|
|
btrfs_err(BTRFS_I(inode)->root->fs_info,
|
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"free space cache page truncated");
|
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io_ctl_drop_pages(io_ctl);
|
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return -EIO;
|
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}
|
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if (!PageUptodate(page)) {
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btrfs_err(BTRFS_I(inode)->root->fs_info,
|
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"error reading free space cache");
|
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io_ctl_drop_pages(io_ctl);
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return -EIO;
|
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}
|
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}
|
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}
|
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|
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for (i = 0; i < io_ctl->num_pages; i++)
|
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clear_page_dirty_for_io(io_ctl->pages[i]);
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|
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return 0;
|
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}
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|
|
|
static void io_ctl_set_generation(struct btrfs_io_ctl *io_ctl, u64 generation)
|
|
{
|
|
io_ctl_map_page(io_ctl, 1);
|
|
|
|
/*
|
|
* Skip the csum areas. If we don't check crcs then we just have a
|
|
* 64bit chunk at the front of the first page.
|
|
*/
|
|
io_ctl->cur += (sizeof(u32) * io_ctl->num_pages);
|
|
io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages);
|
|
|
|
put_unaligned_le64(generation, io_ctl->cur);
|
|
io_ctl->cur += sizeof(u64);
|
|
}
|
|
|
|
static int io_ctl_check_generation(struct btrfs_io_ctl *io_ctl, u64 generation)
|
|
{
|
|
u64 cache_gen;
|
|
|
|
/*
|
|
* Skip the crc area. If we don't check crcs then we just have a 64bit
|
|
* chunk at the front of the first page.
|
|
*/
|
|
io_ctl->cur += sizeof(u32) * io_ctl->num_pages;
|
|
io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages);
|
|
|
|
cache_gen = get_unaligned_le64(io_ctl->cur);
|
|
if (cache_gen != generation) {
|
|
btrfs_err_rl(io_ctl->fs_info,
|
|
"space cache generation (%llu) does not match inode (%llu)",
|
|
cache_gen, generation);
|
|
io_ctl_unmap_page(io_ctl);
|
|
return -EIO;
|
|
}
|
|
io_ctl->cur += sizeof(u64);
|
|
return 0;
|
|
}
|
|
|
|
static void io_ctl_set_crc(struct btrfs_io_ctl *io_ctl, int index)
|
|
{
|
|
u32 *tmp;
|
|
u32 crc = ~(u32)0;
|
|
unsigned offset = 0;
|
|
|
|
if (index == 0)
|
|
offset = sizeof(u32) * io_ctl->num_pages;
|
|
|
|
crc = btrfs_crc32c(crc, io_ctl->orig + offset, PAGE_SIZE - offset);
|
|
btrfs_crc32c_final(crc, (u8 *)&crc);
|
|
io_ctl_unmap_page(io_ctl);
|
|
tmp = page_address(io_ctl->pages[0]);
|
|
tmp += index;
|
|
*tmp = crc;
|
|
}
|
|
|
|
static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index)
|
|
{
|
|
u32 *tmp, val;
|
|
u32 crc = ~(u32)0;
|
|
unsigned offset = 0;
|
|
|
|
if (index == 0)
|
|
offset = sizeof(u32) * io_ctl->num_pages;
|
|
|
|
tmp = page_address(io_ctl->pages[0]);
|
|
tmp += index;
|
|
val = *tmp;
|
|
|
|
io_ctl_map_page(io_ctl, 0);
|
|
crc = btrfs_crc32c(crc, io_ctl->orig + offset, PAGE_SIZE - offset);
|
|
btrfs_crc32c_final(crc, (u8 *)&crc);
|
|
if (val != crc) {
|
|
btrfs_err_rl(io_ctl->fs_info,
|
|
"csum mismatch on free space cache");
|
|
io_ctl_unmap_page(io_ctl);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int io_ctl_add_entry(struct btrfs_io_ctl *io_ctl, u64 offset, u64 bytes,
|
|
void *bitmap)
|
|
{
|
|
struct btrfs_free_space_entry *entry;
|
|
|
|
if (!io_ctl->cur)
|
|
return -ENOSPC;
|
|
|
|
entry = io_ctl->cur;
|
|
put_unaligned_le64(offset, &entry->offset);
|
|
put_unaligned_le64(bytes, &entry->bytes);
|
|
entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP :
|
|
BTRFS_FREE_SPACE_EXTENT;
|
|
io_ctl->cur += sizeof(struct btrfs_free_space_entry);
|
|
io_ctl->size -= sizeof(struct btrfs_free_space_entry);
|
|
|
|
if (io_ctl->size >= sizeof(struct btrfs_free_space_entry))
|
|
return 0;
|
|
|
|
io_ctl_set_crc(io_ctl, io_ctl->index - 1);
|
|
|
|
/* No more pages to map */
|
|
if (io_ctl->index >= io_ctl->num_pages)
|
|
return 0;
|
|
|
|
/* map the next page */
|
|
io_ctl_map_page(io_ctl, 1);
|
|
return 0;
|
|
}
|
|
|
|
static int io_ctl_add_bitmap(struct btrfs_io_ctl *io_ctl, void *bitmap)
|
|
{
|
|
if (!io_ctl->cur)
|
|
return -ENOSPC;
|
|
|
|
/*
|
|
* If we aren't at the start of the current page, unmap this one and
|
|
* map the next one if there is any left.
|
|
*/
|
|
if (io_ctl->cur != io_ctl->orig) {
|
|
io_ctl_set_crc(io_ctl, io_ctl->index - 1);
|
|
if (io_ctl->index >= io_ctl->num_pages)
|
|
return -ENOSPC;
|
|
io_ctl_map_page(io_ctl, 0);
|
|
}
|
|
|
|
copy_page(io_ctl->cur, bitmap);
|
|
io_ctl_set_crc(io_ctl, io_ctl->index - 1);
|
|
if (io_ctl->index < io_ctl->num_pages)
|
|
io_ctl_map_page(io_ctl, 0);
|
|
return 0;
|
|
}
|
|
|
|
static void io_ctl_zero_remaining_pages(struct btrfs_io_ctl *io_ctl)
|
|
{
|
|
/*
|
|
* If we're not on the boundary we know we've modified the page and we
|
|
* need to crc the page.
|
|
*/
|
|
if (io_ctl->cur != io_ctl->orig)
|
|
io_ctl_set_crc(io_ctl, io_ctl->index - 1);
|
|
else
|
|
io_ctl_unmap_page(io_ctl);
|
|
|
|
while (io_ctl->index < io_ctl->num_pages) {
|
|
io_ctl_map_page(io_ctl, 1);
|
|
io_ctl_set_crc(io_ctl, io_ctl->index - 1);
|
|
}
|
|
}
|
|
|
|
static int io_ctl_read_entry(struct btrfs_io_ctl *io_ctl,
|
|
struct btrfs_free_space *entry, u8 *type)
|
|
{
|
|
struct btrfs_free_space_entry *e;
|
|
int ret;
|
|
|
|
if (!io_ctl->cur) {
|
|
ret = io_ctl_check_crc(io_ctl, io_ctl->index);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
e = io_ctl->cur;
|
|
entry->offset = get_unaligned_le64(&e->offset);
|
|
entry->bytes = get_unaligned_le64(&e->bytes);
|
|
*type = e->type;
|
|
io_ctl->cur += sizeof(struct btrfs_free_space_entry);
|
|
io_ctl->size -= sizeof(struct btrfs_free_space_entry);
|
|
|
|
if (io_ctl->size >= sizeof(struct btrfs_free_space_entry))
|
|
return 0;
|
|
|
|
io_ctl_unmap_page(io_ctl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int io_ctl_read_bitmap(struct btrfs_io_ctl *io_ctl,
|
|
struct btrfs_free_space *entry)
|
|
{
|
|
int ret;
|
|
|
|
ret = io_ctl_check_crc(io_ctl, io_ctl->index);
|
|
if (ret)
|
|
return ret;
|
|
|
|
copy_page(entry->bitmap, io_ctl->cur);
|
|
io_ctl_unmap_page(io_ctl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl)
|
|
{
|
|
struct btrfs_block_group *block_group = ctl->private;
|
|
u64 max_bytes;
|
|
u64 bitmap_bytes;
|
|
u64 extent_bytes;
|
|
u64 size = block_group->length;
|
|
u64 bytes_per_bg = BITS_PER_BITMAP * ctl->unit;
|
|
u64 max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg);
|
|
|
|
max_bitmaps = max_t(u64, max_bitmaps, 1);
|
|
|
|
ASSERT(ctl->total_bitmaps <= max_bitmaps);
|
|
|
|
/*
|
|
* We are trying to keep the total amount of memory used per 1GiB of
|
|
* space to be MAX_CACHE_BYTES_PER_GIG. However, with a reclamation
|
|
* mechanism of pulling extents >= FORCE_EXTENT_THRESHOLD out of
|
|
* bitmaps, we may end up using more memory than this.
|
|
*/
|
|
if (size < SZ_1G)
|
|
max_bytes = MAX_CACHE_BYTES_PER_GIG;
|
|
else
|
|
max_bytes = MAX_CACHE_BYTES_PER_GIG * div_u64(size, SZ_1G);
|
|
|
|
bitmap_bytes = ctl->total_bitmaps * ctl->unit;
|
|
|
|
/*
|
|
* we want the extent entry threshold to always be at most 1/2 the max
|
|
* bytes we can have, or whatever is less than that.
|
|
*/
|
|
extent_bytes = max_bytes - bitmap_bytes;
|
|
extent_bytes = min_t(u64, extent_bytes, max_bytes >> 1);
|
|
|
|
ctl->extents_thresh =
|
|
div_u64(extent_bytes, sizeof(struct btrfs_free_space));
|
|
}
|
|
|
|
static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode,
|
|
struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_path *path, u64 offset)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_free_space_header *header;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_io_ctl io_ctl;
|
|
struct btrfs_key key;
|
|
struct btrfs_free_space *e, *n;
|
|
LIST_HEAD(bitmaps);
|
|
u64 num_entries;
|
|
u64 num_bitmaps;
|
|
u64 generation;
|
|
u8 type;
|
|
int ret = 0;
|
|
|
|
/* Nothing in the space cache, goodbye */
|
|
if (!i_size_read(inode))
|
|
return 0;
|
|
|
|
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
|
|
key.offset = offset;
|
|
key.type = 0;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
return 0;
|
|
else if (ret > 0) {
|
|
btrfs_release_path(path);
|
|
return 0;
|
|
}
|
|
|
|
ret = -1;
|
|
|
|
leaf = path->nodes[0];
|
|
header = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_free_space_header);
|
|
num_entries = btrfs_free_space_entries(leaf, header);
|
|
num_bitmaps = btrfs_free_space_bitmaps(leaf, header);
|
|
generation = btrfs_free_space_generation(leaf, header);
|
|
btrfs_release_path(path);
|
|
|
|
if (!BTRFS_I(inode)->generation) {
|
|
btrfs_info(fs_info,
|
|
"the free space cache file (%llu) is invalid, skip it",
|
|
offset);
|
|
return 0;
|
|
}
|
|
|
|
if (BTRFS_I(inode)->generation != generation) {
|
|
btrfs_err(fs_info,
|
|
"free space inode generation (%llu) did not match free space cache generation (%llu)",
|
|
BTRFS_I(inode)->generation, generation);
|
|
return 0;
|
|
}
|
|
|
|
if (!num_entries)
|
|
return 0;
|
|
|
|
ret = io_ctl_init(&io_ctl, inode, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
readahead_cache(inode);
|
|
|
|
ret = io_ctl_prepare_pages(&io_ctl, true);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = io_ctl_check_crc(&io_ctl, 0);
|
|
if (ret)
|
|
goto free_cache;
|
|
|
|
ret = io_ctl_check_generation(&io_ctl, generation);
|
|
if (ret)
|
|
goto free_cache;
|
|
|
|
while (num_entries) {
|
|
e = kmem_cache_zalloc(btrfs_free_space_cachep,
|
|
GFP_NOFS);
|
|
if (!e) {
|
|
ret = -ENOMEM;
|
|
goto free_cache;
|
|
}
|
|
|
|
ret = io_ctl_read_entry(&io_ctl, e, &type);
|
|
if (ret) {
|
|
kmem_cache_free(btrfs_free_space_cachep, e);
|
|
goto free_cache;
|
|
}
|
|
|
|
if (!e->bytes) {
|
|
ret = -1;
|
|
kmem_cache_free(btrfs_free_space_cachep, e);
|
|
goto free_cache;
|
|
}
|
|
|
|
if (type == BTRFS_FREE_SPACE_EXTENT) {
|
|
spin_lock(&ctl->tree_lock);
|
|
ret = link_free_space(ctl, e);
|
|
spin_unlock(&ctl->tree_lock);
|
|
if (ret) {
|
|
btrfs_err(fs_info,
|
|
"Duplicate entries in free space cache, dumping");
|
|
kmem_cache_free(btrfs_free_space_cachep, e);
|
|
goto free_cache;
|
|
}
|
|
} else {
|
|
ASSERT(num_bitmaps);
|
|
num_bitmaps--;
|
|
e->bitmap = kmem_cache_zalloc(
|
|
btrfs_free_space_bitmap_cachep, GFP_NOFS);
|
|
if (!e->bitmap) {
|
|
ret = -ENOMEM;
|
|
kmem_cache_free(
|
|
btrfs_free_space_cachep, e);
|
|
goto free_cache;
|
|
}
|
|
spin_lock(&ctl->tree_lock);
|
|
ret = link_free_space(ctl, e);
|
|
ctl->total_bitmaps++;
|
|
recalculate_thresholds(ctl);
|
|
spin_unlock(&ctl->tree_lock);
|
|
if (ret) {
|
|
btrfs_err(fs_info,
|
|
"Duplicate entries in free space cache, dumping");
|
|
kmem_cache_free(btrfs_free_space_cachep, e);
|
|
goto free_cache;
|
|
}
|
|
list_add_tail(&e->list, &bitmaps);
|
|
}
|
|
|
|
num_entries--;
|
|
}
|
|
|
|
io_ctl_unmap_page(&io_ctl);
|
|
|
|
/*
|
|
* We add the bitmaps at the end of the entries in order that
|
|
* the bitmap entries are added to the cache.
|
|
*/
|
|
list_for_each_entry_safe(e, n, &bitmaps, list) {
|
|
list_del_init(&e->list);
|
|
ret = io_ctl_read_bitmap(&io_ctl, e);
|
|
if (ret)
|
|
goto free_cache;
|
|
}
|
|
|
|
io_ctl_drop_pages(&io_ctl);
|
|
ret = 1;
|
|
out:
|
|
io_ctl_free(&io_ctl);
|
|
return ret;
|
|
free_cache:
|
|
io_ctl_drop_pages(&io_ctl);
|
|
__btrfs_remove_free_space_cache(ctl);
|
|
goto out;
|
|
}
|
|
|
|
static int copy_free_space_cache(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_space_ctl *ctl)
|
|
{
|
|
struct btrfs_free_space *info;
|
|
struct rb_node *n;
|
|
int ret = 0;
|
|
|
|
while (!ret && (n = rb_first(&ctl->free_space_offset)) != NULL) {
|
|
info = rb_entry(n, struct btrfs_free_space, offset_index);
|
|
if (!info->bitmap) {
|
|
unlink_free_space(ctl, info);
|
|
ret = btrfs_add_free_space(block_group, info->offset,
|
|
info->bytes);
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
} else {
|
|
u64 offset = info->offset;
|
|
u64 bytes = ctl->unit;
|
|
|
|
while (search_bitmap(ctl, info, &offset, &bytes,
|
|
false) == 0) {
|
|
ret = btrfs_add_free_space(block_group, offset,
|
|
bytes);
|
|
if (ret)
|
|
break;
|
|
bitmap_clear_bits(ctl, info, offset, bytes);
|
|
offset = info->offset;
|
|
bytes = ctl->unit;
|
|
}
|
|
free_bitmap(ctl, info);
|
|
}
|
|
cond_resched();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int load_free_space_cache(struct btrfs_block_group *block_group)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space_ctl tmp_ctl = {};
|
|
struct inode *inode;
|
|
struct btrfs_path *path;
|
|
int ret = 0;
|
|
bool matched;
|
|
u64 used = block_group->used;
|
|
|
|
/*
|
|
* Because we could potentially discard our loaded free space, we want
|
|
* to load everything into a temporary structure first, and then if it's
|
|
* valid copy it all into the actual free space ctl.
|
|
*/
|
|
btrfs_init_free_space_ctl(block_group, &tmp_ctl);
|
|
|
|
/*
|
|
* If this block group has been marked to be cleared for one reason or
|
|
* another then we can't trust the on disk cache, so just return.
|
|
*/
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
|
|
spin_unlock(&block_group->lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return 0;
|
|
path->search_commit_root = 1;
|
|
path->skip_locking = 1;
|
|
|
|
/*
|
|
* We must pass a path with search_commit_root set to btrfs_iget in
|
|
* order to avoid a deadlock when allocating extents for the tree root.
|
|
*
|
|
* When we are COWing an extent buffer from the tree root, when looking
|
|
* for a free extent, at extent-tree.c:find_free_extent(), we can find
|
|
* block group without its free space cache loaded. When we find one
|
|
* we must load its space cache which requires reading its free space
|
|
* cache's inode item from the root tree. If this inode item is located
|
|
* in the same leaf that we started COWing before, then we end up in
|
|
* deadlock on the extent buffer (trying to read lock it when we
|
|
* previously write locked it).
|
|
*
|
|
* It's safe to read the inode item using the commit root because
|
|
* block groups, once loaded, stay in memory forever (until they are
|
|
* removed) as well as their space caches once loaded. New block groups
|
|
* once created get their ->cached field set to BTRFS_CACHE_FINISHED so
|
|
* we will never try to read their inode item while the fs is mounted.
|
|
*/
|
|
inode = lookup_free_space_inode(block_group, path);
|
|
if (IS_ERR(inode)) {
|
|
btrfs_free_path(path);
|
|
return 0;
|
|
}
|
|
|
|
/* We may have converted the inode and made the cache invalid. */
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) {
|
|
spin_unlock(&block_group->lock);
|
|
btrfs_free_path(path);
|
|
goto out;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
|
|
ret = __load_free_space_cache(fs_info->tree_root, inode, &tmp_ctl,
|
|
path, block_group->start);
|
|
btrfs_free_path(path);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
matched = (tmp_ctl.free_space == (block_group->length - used -
|
|
block_group->bytes_super));
|
|
|
|
if (matched) {
|
|
ret = copy_free_space_cache(block_group, &tmp_ctl);
|
|
/*
|
|
* ret == 1 means we successfully loaded the free space cache,
|
|
* so we need to re-set it here.
|
|
*/
|
|
if (ret == 0)
|
|
ret = 1;
|
|
} else {
|
|
__btrfs_remove_free_space_cache(&tmp_ctl);
|
|
btrfs_warn(fs_info,
|
|
"block group %llu has wrong amount of free space",
|
|
block_group->start);
|
|
ret = -1;
|
|
}
|
|
out:
|
|
if (ret < 0) {
|
|
/* This cache is bogus, make sure it gets cleared */
|
|
spin_lock(&block_group->lock);
|
|
block_group->disk_cache_state = BTRFS_DC_CLEAR;
|
|
spin_unlock(&block_group->lock);
|
|
ret = 0;
|
|
|
|
btrfs_warn(fs_info,
|
|
"failed to load free space cache for block group %llu, rebuilding it now",
|
|
block_group->start);
|
|
}
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
btrfs_discard_update_discardable(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
static noinline_for_stack
|
|
int write_cache_extent_entries(struct btrfs_io_ctl *io_ctl,
|
|
struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_block_group *block_group,
|
|
int *entries, int *bitmaps,
|
|
struct list_head *bitmap_list)
|
|
{
|
|
int ret;
|
|
struct btrfs_free_cluster *cluster = NULL;
|
|
struct btrfs_free_cluster *cluster_locked = NULL;
|
|
struct rb_node *node = rb_first(&ctl->free_space_offset);
|
|
struct btrfs_trim_range *trim_entry;
|
|
|
|
/* Get the cluster for this block_group if it exists */
|
|
if (block_group && !list_empty(&block_group->cluster_list)) {
|
|
cluster = list_entry(block_group->cluster_list.next,
|
|
struct btrfs_free_cluster,
|
|
block_group_list);
|
|
}
|
|
|
|
if (!node && cluster) {
|
|
cluster_locked = cluster;
|
|
spin_lock(&cluster_locked->lock);
|
|
node = rb_first(&cluster->root);
|
|
cluster = NULL;
|
|
}
|
|
|
|
/* Write out the extent entries */
|
|
while (node) {
|
|
struct btrfs_free_space *e;
|
|
|
|
e = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
*entries += 1;
|
|
|
|
ret = io_ctl_add_entry(io_ctl, e->offset, e->bytes,
|
|
e->bitmap);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
if (e->bitmap) {
|
|
list_add_tail(&e->list, bitmap_list);
|
|
*bitmaps += 1;
|
|
}
|
|
node = rb_next(node);
|
|
if (!node && cluster) {
|
|
node = rb_first(&cluster->root);
|
|
cluster_locked = cluster;
|
|
spin_lock(&cluster_locked->lock);
|
|
cluster = NULL;
|
|
}
|
|
}
|
|
if (cluster_locked) {
|
|
spin_unlock(&cluster_locked->lock);
|
|
cluster_locked = NULL;
|
|
}
|
|
|
|
/*
|
|
* Make sure we don't miss any range that was removed from our rbtree
|
|
* because trimming is running. Otherwise after a umount+mount (or crash
|
|
* after committing the transaction) we would leak free space and get
|
|
* an inconsistent free space cache report from fsck.
|
|
*/
|
|
list_for_each_entry(trim_entry, &ctl->trimming_ranges, list) {
|
|
ret = io_ctl_add_entry(io_ctl, trim_entry->start,
|
|
trim_entry->bytes, NULL);
|
|
if (ret)
|
|
goto fail;
|
|
*entries += 1;
|
|
}
|
|
|
|
return 0;
|
|
fail:
|
|
if (cluster_locked)
|
|
spin_unlock(&cluster_locked->lock);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static noinline_for_stack int
|
|
update_cache_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct inode *inode,
|
|
struct btrfs_path *path, u64 offset,
|
|
int entries, int bitmaps)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_free_space_header *header;
|
|
struct extent_buffer *leaf;
|
|
int ret;
|
|
|
|
key.objectid = BTRFS_FREE_SPACE_OBJECTID;
|
|
key.offset = offset;
|
|
key.type = 0;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret < 0) {
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1,
|
|
EXTENT_DELALLOC, 0, 0, NULL);
|
|
goto fail;
|
|
}
|
|
leaf = path->nodes[0];
|
|
if (ret > 0) {
|
|
struct btrfs_key found_key;
|
|
ASSERT(path->slots[0]);
|
|
path->slots[0]--;
|
|
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
|
|
if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID ||
|
|
found_key.offset != offset) {
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0,
|
|
inode->i_size - 1, EXTENT_DELALLOC, 0,
|
|
0, NULL);
|
|
btrfs_release_path(path);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
BTRFS_I(inode)->generation = trans->transid;
|
|
header = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_free_space_header);
|
|
btrfs_set_free_space_entries(leaf, header, entries);
|
|
btrfs_set_free_space_bitmaps(leaf, header, bitmaps);
|
|
btrfs_set_free_space_generation(leaf, header, trans->transid);
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_release_path(path);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
return -1;
|
|
}
|
|
|
|
static noinline_for_stack int write_pinned_extent_entries(
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_io_ctl *io_ctl,
|
|
int *entries)
|
|
{
|
|
u64 start, extent_start, extent_end, len;
|
|
struct extent_io_tree *unpin = NULL;
|
|
int ret;
|
|
|
|
if (!block_group)
|
|
return 0;
|
|
|
|
/*
|
|
* We want to add any pinned extents to our free space cache
|
|
* so we don't leak the space
|
|
*
|
|
* We shouldn't have switched the pinned extents yet so this is the
|
|
* right one
|
|
*/
|
|
unpin = &trans->transaction->pinned_extents;
|
|
|
|
start = block_group->start;
|
|
|
|
while (start < block_group->start + block_group->length) {
|
|
ret = find_first_extent_bit(unpin, start,
|
|
&extent_start, &extent_end,
|
|
EXTENT_DIRTY, NULL);
|
|
if (ret)
|
|
return 0;
|
|
|
|
/* This pinned extent is out of our range */
|
|
if (extent_start >= block_group->start + block_group->length)
|
|
return 0;
|
|
|
|
extent_start = max(extent_start, start);
|
|
extent_end = min(block_group->start + block_group->length,
|
|
extent_end + 1);
|
|
len = extent_end - extent_start;
|
|
|
|
*entries += 1;
|
|
ret = io_ctl_add_entry(io_ctl, extent_start, len, NULL);
|
|
if (ret)
|
|
return -ENOSPC;
|
|
|
|
start = extent_end;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static noinline_for_stack int
|
|
write_bitmap_entries(struct btrfs_io_ctl *io_ctl, struct list_head *bitmap_list)
|
|
{
|
|
struct btrfs_free_space *entry, *next;
|
|
int ret;
|
|
|
|
/* Write out the bitmaps */
|
|
list_for_each_entry_safe(entry, next, bitmap_list, list) {
|
|
ret = io_ctl_add_bitmap(io_ctl, entry->bitmap);
|
|
if (ret)
|
|
return -ENOSPC;
|
|
list_del_init(&entry->list);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flush_dirty_cache(struct inode *inode)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_wait_ordered_range(inode, 0, (u64)-1);
|
|
if (ret)
|
|
clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1,
|
|
EXTENT_DELALLOC, 0, 0, NULL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void noinline_for_stack
|
|
cleanup_bitmap_list(struct list_head *bitmap_list)
|
|
{
|
|
struct btrfs_free_space *entry, *next;
|
|
|
|
list_for_each_entry_safe(entry, next, bitmap_list, list)
|
|
list_del_init(&entry->list);
|
|
}
|
|
|
|
static void noinline_for_stack
|
|
cleanup_write_cache_enospc(struct inode *inode,
|
|
struct btrfs_io_ctl *io_ctl,
|
|
struct extent_state **cached_state)
|
|
{
|
|
io_ctl_drop_pages(io_ctl);
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0,
|
|
i_size_read(inode) - 1, cached_state);
|
|
}
|
|
|
|
static int __btrfs_wait_cache_io(struct btrfs_root *root,
|
|
struct btrfs_trans_handle *trans,
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_io_ctl *io_ctl,
|
|
struct btrfs_path *path, u64 offset)
|
|
{
|
|
int ret;
|
|
struct inode *inode = io_ctl->inode;
|
|
|
|
if (!inode)
|
|
return 0;
|
|
|
|
/* Flush the dirty pages in the cache file. */
|
|
ret = flush_dirty_cache(inode);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Update the cache item to tell everyone this cache file is valid. */
|
|
ret = update_cache_item(trans, root, inode, path, offset,
|
|
io_ctl->entries, io_ctl->bitmaps);
|
|
out:
|
|
if (ret) {
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
BTRFS_I(inode)->generation = 0;
|
|
if (block_group)
|
|
btrfs_debug(root->fs_info,
|
|
"failed to write free space cache for block group %llu error %d",
|
|
block_group->start, ret);
|
|
}
|
|
btrfs_update_inode(trans, root, BTRFS_I(inode));
|
|
|
|
if (block_group) {
|
|
/* the dirty list is protected by the dirty_bgs_lock */
|
|
spin_lock(&trans->transaction->dirty_bgs_lock);
|
|
|
|
/* the disk_cache_state is protected by the block group lock */
|
|
spin_lock(&block_group->lock);
|
|
|
|
/*
|
|
* only mark this as written if we didn't get put back on
|
|
* the dirty list while waiting for IO. Otherwise our
|
|
* cache state won't be right, and we won't get written again
|
|
*/
|
|
if (!ret && list_empty(&block_group->dirty_list))
|
|
block_group->disk_cache_state = BTRFS_DC_WRITTEN;
|
|
else if (ret)
|
|
block_group->disk_cache_state = BTRFS_DC_ERROR;
|
|
|
|
spin_unlock(&block_group->lock);
|
|
spin_unlock(&trans->transaction->dirty_bgs_lock);
|
|
io_ctl->inode = NULL;
|
|
iput(inode);
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
int btrfs_wait_cache_io(struct btrfs_trans_handle *trans,
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_path *path)
|
|
{
|
|
return __btrfs_wait_cache_io(block_group->fs_info->tree_root, trans,
|
|
block_group, &block_group->io_ctl,
|
|
path, block_group->start);
|
|
}
|
|
|
|
/**
|
|
* Write out cached info to an inode
|
|
*
|
|
* @root: root the inode belongs to
|
|
* @inode: freespace inode we are writing out
|
|
* @ctl: free space cache we are going to write out
|
|
* @block_group: block_group for this cache if it belongs to a block_group
|
|
* @io_ctl: holds context for the io
|
|
* @trans: the trans handle
|
|
*
|
|
* This function writes out a free space cache struct to disk for quick recovery
|
|
* on mount. This will return 0 if it was successful in writing the cache out,
|
|
* or an errno if it was not.
|
|
*/
|
|
static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode,
|
|
struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_io_ctl *io_ctl,
|
|
struct btrfs_trans_handle *trans)
|
|
{
|
|
struct extent_state *cached_state = NULL;
|
|
LIST_HEAD(bitmap_list);
|
|
int entries = 0;
|
|
int bitmaps = 0;
|
|
int ret;
|
|
int must_iput = 0;
|
|
|
|
if (!i_size_read(inode))
|
|
return -EIO;
|
|
|
|
WARN_ON(io_ctl->pages);
|
|
ret = io_ctl_init(io_ctl, inode, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) {
|
|
down_write(&block_group->data_rwsem);
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->delalloc_bytes) {
|
|
block_group->disk_cache_state = BTRFS_DC_WRITTEN;
|
|
spin_unlock(&block_group->lock);
|
|
up_write(&block_group->data_rwsem);
|
|
BTRFS_I(inode)->generation = 0;
|
|
ret = 0;
|
|
must_iput = 1;
|
|
goto out;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
}
|
|
|
|
/* Lock all pages first so we can lock the extent safely. */
|
|
ret = io_ctl_prepare_pages(io_ctl, false);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1,
|
|
&cached_state);
|
|
|
|
io_ctl_set_generation(io_ctl, trans->transid);
|
|
|
|
mutex_lock(&ctl->cache_writeout_mutex);
|
|
/* Write out the extent entries in the free space cache */
|
|
spin_lock(&ctl->tree_lock);
|
|
ret = write_cache_extent_entries(io_ctl, ctl,
|
|
block_group, &entries, &bitmaps,
|
|
&bitmap_list);
|
|
if (ret)
|
|
goto out_nospc_locked;
|
|
|
|
/*
|
|
* Some spaces that are freed in the current transaction are pinned,
|
|
* they will be added into free space cache after the transaction is
|
|
* committed, we shouldn't lose them.
|
|
*
|
|
* If this changes while we are working we'll get added back to
|
|
* the dirty list and redo it. No locking needed
|
|
*/
|
|
ret = write_pinned_extent_entries(trans, block_group, io_ctl, &entries);
|
|
if (ret)
|
|
goto out_nospc_locked;
|
|
|
|
/*
|
|
* At last, we write out all the bitmaps and keep cache_writeout_mutex
|
|
* locked while doing it because a concurrent trim can be manipulating
|
|
* or freeing the bitmap.
|
|
*/
|
|
ret = write_bitmap_entries(io_ctl, &bitmap_list);
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
if (ret)
|
|
goto out_nospc;
|
|
|
|
/* Zero out the rest of the pages just to make sure */
|
|
io_ctl_zero_remaining_pages(io_ctl);
|
|
|
|
/* Everything is written out, now we dirty the pages in the file. */
|
|
ret = btrfs_dirty_pages(BTRFS_I(inode), io_ctl->pages,
|
|
io_ctl->num_pages, 0, i_size_read(inode),
|
|
&cached_state, false);
|
|
if (ret)
|
|
goto out_nospc;
|
|
|
|
if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA))
|
|
up_write(&block_group->data_rwsem);
|
|
/*
|
|
* Release the pages and unlock the extent, we will flush
|
|
* them out later
|
|
*/
|
|
io_ctl_drop_pages(io_ctl);
|
|
io_ctl_free(io_ctl);
|
|
|
|
unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0,
|
|
i_size_read(inode) - 1, &cached_state);
|
|
|
|
/*
|
|
* at this point the pages are under IO and we're happy,
|
|
* The caller is responsible for waiting on them and updating
|
|
* the cache and the inode
|
|
*/
|
|
io_ctl->entries = entries;
|
|
io_ctl->bitmaps = bitmaps;
|
|
|
|
ret = btrfs_fdatawrite_range(inode, 0, (u64)-1);
|
|
if (ret)
|
|
goto out;
|
|
|
|
return 0;
|
|
|
|
out_nospc_locked:
|
|
cleanup_bitmap_list(&bitmap_list);
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
|
|
out_nospc:
|
|
cleanup_write_cache_enospc(inode, io_ctl, &cached_state);
|
|
|
|
out_unlock:
|
|
if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA))
|
|
up_write(&block_group->data_rwsem);
|
|
|
|
out:
|
|
io_ctl->inode = NULL;
|
|
io_ctl_free(io_ctl);
|
|
if (ret) {
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
BTRFS_I(inode)->generation = 0;
|
|
}
|
|
btrfs_update_inode(trans, root, BTRFS_I(inode));
|
|
if (must_iput)
|
|
iput(inode);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_write_out_cache(struct btrfs_trans_handle *trans,
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_path *path)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct inode *inode;
|
|
int ret = 0;
|
|
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->disk_cache_state < BTRFS_DC_SETUP) {
|
|
spin_unlock(&block_group->lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
|
|
inode = lookup_free_space_inode(block_group, path);
|
|
if (IS_ERR(inode))
|
|
return 0;
|
|
|
|
ret = __btrfs_write_out_cache(fs_info->tree_root, inode, ctl,
|
|
block_group, &block_group->io_ctl, trans);
|
|
if (ret) {
|
|
btrfs_debug(fs_info,
|
|
"failed to write free space cache for block group %llu error %d",
|
|
block_group->start, ret);
|
|
spin_lock(&block_group->lock);
|
|
block_group->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&block_group->lock);
|
|
|
|
block_group->io_ctl.inode = NULL;
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* if ret == 0 the caller is expected to call btrfs_wait_cache_io
|
|
* to wait for IO and put the inode
|
|
*/
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit,
|
|
u64 offset)
|
|
{
|
|
ASSERT(offset >= bitmap_start);
|
|
offset -= bitmap_start;
|
|
return (unsigned long)(div_u64(offset, unit));
|
|
}
|
|
|
|
static inline unsigned long bytes_to_bits(u64 bytes, u32 unit)
|
|
{
|
|
return (unsigned long)(div_u64(bytes, unit));
|
|
}
|
|
|
|
static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
u64 offset)
|
|
{
|
|
u64 bitmap_start;
|
|
u64 bytes_per_bitmap;
|
|
|
|
bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit;
|
|
bitmap_start = offset - ctl->start;
|
|
bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap);
|
|
bitmap_start *= bytes_per_bitmap;
|
|
bitmap_start += ctl->start;
|
|
|
|
return bitmap_start;
|
|
}
|
|
|
|
static int tree_insert_offset(struct rb_root *root, u64 offset,
|
|
struct rb_node *node, int bitmap)
|
|
{
|
|
struct rb_node **p = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct btrfs_free_space *info;
|
|
|
|
while (*p) {
|
|
parent = *p;
|
|
info = rb_entry(parent, struct btrfs_free_space, offset_index);
|
|
|
|
if (offset < info->offset) {
|
|
p = &(*p)->rb_left;
|
|
} else if (offset > info->offset) {
|
|
p = &(*p)->rb_right;
|
|
} else {
|
|
/*
|
|
* we could have a bitmap entry and an extent entry
|
|
* share the same offset. If this is the case, we want
|
|
* the extent entry to always be found first if we do a
|
|
* linear search through the tree, since we want to have
|
|
* the quickest allocation time, and allocating from an
|
|
* extent is faster than allocating from a bitmap. So
|
|
* if we're inserting a bitmap and we find an entry at
|
|
* this offset, we want to go right, or after this entry
|
|
* logically. If we are inserting an extent and we've
|
|
* found a bitmap, we want to go left, or before
|
|
* logically.
|
|
*/
|
|
if (bitmap) {
|
|
if (info->bitmap) {
|
|
WARN_ON_ONCE(1);
|
|
return -EEXIST;
|
|
}
|
|
p = &(*p)->rb_right;
|
|
} else {
|
|
if (!info->bitmap) {
|
|
WARN_ON_ONCE(1);
|
|
return -EEXIST;
|
|
}
|
|
p = &(*p)->rb_left;
|
|
}
|
|
}
|
|
}
|
|
|
|
rb_link_node(node, parent, p);
|
|
rb_insert_color(node, root);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* searches the tree for the given offset.
|
|
*
|
|
* fuzzy - If this is set, then we are trying to make an allocation, and we just
|
|
* want a section that has at least bytes size and comes at or after the given
|
|
* offset.
|
|
*/
|
|
static struct btrfs_free_space *
|
|
tree_search_offset(struct btrfs_free_space_ctl *ctl,
|
|
u64 offset, int bitmap_only, int fuzzy)
|
|
{
|
|
struct rb_node *n = ctl->free_space_offset.rb_node;
|
|
struct btrfs_free_space *entry, *prev = NULL;
|
|
|
|
/* find entry that is closest to the 'offset' */
|
|
while (1) {
|
|
if (!n) {
|
|
entry = NULL;
|
|
break;
|
|
}
|
|
|
|
entry = rb_entry(n, struct btrfs_free_space, offset_index);
|
|
prev = entry;
|
|
|
|
if (offset < entry->offset)
|
|
n = n->rb_left;
|
|
else if (offset > entry->offset)
|
|
n = n->rb_right;
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (bitmap_only) {
|
|
if (!entry)
|
|
return NULL;
|
|
if (entry->bitmap)
|
|
return entry;
|
|
|
|
/*
|
|
* bitmap entry and extent entry may share same offset,
|
|
* in that case, bitmap entry comes after extent entry.
|
|
*/
|
|
n = rb_next(n);
|
|
if (!n)
|
|
return NULL;
|
|
entry = rb_entry(n, struct btrfs_free_space, offset_index);
|
|
if (entry->offset != offset)
|
|
return NULL;
|
|
|
|
WARN_ON(!entry->bitmap);
|
|
return entry;
|
|
} else if (entry) {
|
|
if (entry->bitmap) {
|
|
/*
|
|
* if previous extent entry covers the offset,
|
|
* we should return it instead of the bitmap entry
|
|
*/
|
|
n = rb_prev(&entry->offset_index);
|
|
if (n) {
|
|
prev = rb_entry(n, struct btrfs_free_space,
|
|
offset_index);
|
|
if (!prev->bitmap &&
|
|
prev->offset + prev->bytes > offset)
|
|
entry = prev;
|
|
}
|
|
}
|
|
return entry;
|
|
}
|
|
|
|
if (!prev)
|
|
return NULL;
|
|
|
|
/* find last entry before the 'offset' */
|
|
entry = prev;
|
|
if (entry->offset > offset) {
|
|
n = rb_prev(&entry->offset_index);
|
|
if (n) {
|
|
entry = rb_entry(n, struct btrfs_free_space,
|
|
offset_index);
|
|
ASSERT(entry->offset <= offset);
|
|
} else {
|
|
if (fuzzy)
|
|
return entry;
|
|
else
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
if (entry->bitmap) {
|
|
n = rb_prev(&entry->offset_index);
|
|
if (n) {
|
|
prev = rb_entry(n, struct btrfs_free_space,
|
|
offset_index);
|
|
if (!prev->bitmap &&
|
|
prev->offset + prev->bytes > offset)
|
|
return prev;
|
|
}
|
|
if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset)
|
|
return entry;
|
|
} else if (entry->offset + entry->bytes > offset)
|
|
return entry;
|
|
|
|
if (!fuzzy)
|
|
return NULL;
|
|
|
|
while (1) {
|
|
if (entry->bitmap) {
|
|
if (entry->offset + BITS_PER_BITMAP *
|
|
ctl->unit > offset)
|
|
break;
|
|
} else {
|
|
if (entry->offset + entry->bytes > offset)
|
|
break;
|
|
}
|
|
|
|
n = rb_next(&entry->offset_index);
|
|
if (!n)
|
|
return NULL;
|
|
entry = rb_entry(n, struct btrfs_free_space, offset_index);
|
|
}
|
|
return entry;
|
|
}
|
|
|
|
static inline void
|
|
__unlink_free_space(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info)
|
|
{
|
|
rb_erase(&info->offset_index, &ctl->free_space_offset);
|
|
ctl->free_extents--;
|
|
|
|
if (!info->bitmap && !btrfs_free_space_trimmed(info)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR]--;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] -= info->bytes;
|
|
}
|
|
}
|
|
|
|
static void unlink_free_space(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info)
|
|
{
|
|
__unlink_free_space(ctl, info);
|
|
ctl->free_space -= info->bytes;
|
|
}
|
|
|
|
static int link_free_space(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info)
|
|
{
|
|
int ret = 0;
|
|
|
|
ASSERT(info->bytes || info->bitmap);
|
|
ret = tree_insert_offset(&ctl->free_space_offset, info->offset,
|
|
&info->offset_index, (info->bitmap != NULL));
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!info->bitmap && !btrfs_free_space_trimmed(info)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR]++;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] += info->bytes;
|
|
}
|
|
|
|
ctl->free_space += info->bytes;
|
|
ctl->free_extents++;
|
|
return ret;
|
|
}
|
|
|
|
static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info,
|
|
u64 offset, u64 bytes)
|
|
{
|
|
unsigned long start, count, end;
|
|
int extent_delta = -1;
|
|
|
|
start = offset_to_bit(info->offset, ctl->unit, offset);
|
|
count = bytes_to_bits(bytes, ctl->unit);
|
|
end = start + count;
|
|
ASSERT(end <= BITS_PER_BITMAP);
|
|
|
|
bitmap_clear(info->bitmap, start, count);
|
|
|
|
info->bytes -= bytes;
|
|
if (info->max_extent_size > ctl->unit)
|
|
info->max_extent_size = 0;
|
|
|
|
if (start && test_bit(start - 1, info->bitmap))
|
|
extent_delta++;
|
|
|
|
if (end < BITS_PER_BITMAP && test_bit(end, info->bitmap))
|
|
extent_delta++;
|
|
|
|
info->bitmap_extents += extent_delta;
|
|
if (!btrfs_free_space_trimmed(info)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR] += extent_delta;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes;
|
|
}
|
|
}
|
|
|
|
static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info, u64 offset,
|
|
u64 bytes)
|
|
{
|
|
__bitmap_clear_bits(ctl, info, offset, bytes);
|
|
ctl->free_space -= bytes;
|
|
}
|
|
|
|
static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info, u64 offset,
|
|
u64 bytes)
|
|
{
|
|
unsigned long start, count, end;
|
|
int extent_delta = 1;
|
|
|
|
start = offset_to_bit(info->offset, ctl->unit, offset);
|
|
count = bytes_to_bits(bytes, ctl->unit);
|
|
end = start + count;
|
|
ASSERT(end <= BITS_PER_BITMAP);
|
|
|
|
bitmap_set(info->bitmap, start, count);
|
|
|
|
info->bytes += bytes;
|
|
ctl->free_space += bytes;
|
|
|
|
if (start && test_bit(start - 1, info->bitmap))
|
|
extent_delta--;
|
|
|
|
if (end < BITS_PER_BITMAP && test_bit(end, info->bitmap))
|
|
extent_delta--;
|
|
|
|
info->bitmap_extents += extent_delta;
|
|
if (!btrfs_free_space_trimmed(info)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR] += extent_delta;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] += bytes;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we can not find suitable extent, we will use bytes to record
|
|
* the size of the max extent.
|
|
*/
|
|
static int search_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *bitmap_info, u64 *offset,
|
|
u64 *bytes, bool for_alloc)
|
|
{
|
|
unsigned long found_bits = 0;
|
|
unsigned long max_bits = 0;
|
|
unsigned long bits, i;
|
|
unsigned long next_zero;
|
|
unsigned long extent_bits;
|
|
|
|
/*
|
|
* Skip searching the bitmap if we don't have a contiguous section that
|
|
* is large enough for this allocation.
|
|
*/
|
|
if (for_alloc &&
|
|
bitmap_info->max_extent_size &&
|
|
bitmap_info->max_extent_size < *bytes) {
|
|
*bytes = bitmap_info->max_extent_size;
|
|
return -1;
|
|
}
|
|
|
|
i = offset_to_bit(bitmap_info->offset, ctl->unit,
|
|
max_t(u64, *offset, bitmap_info->offset));
|
|
bits = bytes_to_bits(*bytes, ctl->unit);
|
|
|
|
for_each_set_bit_from(i, bitmap_info->bitmap, BITS_PER_BITMAP) {
|
|
if (for_alloc && bits == 1) {
|
|
found_bits = 1;
|
|
break;
|
|
}
|
|
next_zero = find_next_zero_bit(bitmap_info->bitmap,
|
|
BITS_PER_BITMAP, i);
|
|
extent_bits = next_zero - i;
|
|
if (extent_bits >= bits) {
|
|
found_bits = extent_bits;
|
|
break;
|
|
} else if (extent_bits > max_bits) {
|
|
max_bits = extent_bits;
|
|
}
|
|
i = next_zero;
|
|
}
|
|
|
|
if (found_bits) {
|
|
*offset = (u64)(i * ctl->unit) + bitmap_info->offset;
|
|
*bytes = (u64)(found_bits) * ctl->unit;
|
|
return 0;
|
|
}
|
|
|
|
*bytes = (u64)(max_bits) * ctl->unit;
|
|
bitmap_info->max_extent_size = *bytes;
|
|
return -1;
|
|
}
|
|
|
|
static inline u64 get_max_extent_size(struct btrfs_free_space *entry)
|
|
{
|
|
if (entry->bitmap)
|
|
return entry->max_extent_size;
|
|
return entry->bytes;
|
|
}
|
|
|
|
/* Cache the size of the max extent in bytes */
|
|
static struct btrfs_free_space *
|
|
find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
|
|
unsigned long align, u64 *max_extent_size)
|
|
{
|
|
struct btrfs_free_space *entry;
|
|
struct rb_node *node;
|
|
u64 tmp;
|
|
u64 align_off;
|
|
int ret;
|
|
|
|
if (!ctl->free_space_offset.rb_node)
|
|
goto out;
|
|
|
|
entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1);
|
|
if (!entry)
|
|
goto out;
|
|
|
|
for (node = &entry->offset_index; node; node = rb_next(node)) {
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
if (entry->bytes < *bytes) {
|
|
*max_extent_size = max(get_max_extent_size(entry),
|
|
*max_extent_size);
|
|
continue;
|
|
}
|
|
|
|
/* make sure the space returned is big enough
|
|
* to match our requested alignment
|
|
*/
|
|
if (*bytes >= align) {
|
|
tmp = entry->offset - ctl->start + align - 1;
|
|
tmp = div64_u64(tmp, align);
|
|
tmp = tmp * align + ctl->start;
|
|
align_off = tmp - entry->offset;
|
|
} else {
|
|
align_off = 0;
|
|
tmp = entry->offset;
|
|
}
|
|
|
|
if (entry->bytes < *bytes + align_off) {
|
|
*max_extent_size = max(get_max_extent_size(entry),
|
|
*max_extent_size);
|
|
continue;
|
|
}
|
|
|
|
if (entry->bitmap) {
|
|
u64 size = *bytes;
|
|
|
|
ret = search_bitmap(ctl, entry, &tmp, &size, true);
|
|
if (!ret) {
|
|
*offset = tmp;
|
|
*bytes = size;
|
|
return entry;
|
|
} else {
|
|
*max_extent_size =
|
|
max(get_max_extent_size(entry),
|
|
*max_extent_size);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
*offset = tmp;
|
|
*bytes = entry->bytes - align_off;
|
|
return entry;
|
|
}
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
static void add_new_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info, u64 offset)
|
|
{
|
|
info->offset = offset_to_bitmap(ctl, offset);
|
|
info->bytes = 0;
|
|
info->bitmap_extents = 0;
|
|
INIT_LIST_HEAD(&info->list);
|
|
link_free_space(ctl, info);
|
|
ctl->total_bitmaps++;
|
|
recalculate_thresholds(ctl);
|
|
}
|
|
|
|
static void free_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *bitmap_info)
|
|
{
|
|
/*
|
|
* Normally when this is called, the bitmap is completely empty. However,
|
|
* if we are blowing up the free space cache for one reason or another
|
|
* via __btrfs_remove_free_space_cache(), then it may not be freed and
|
|
* we may leave stats on the table.
|
|
*/
|
|
if (bitmap_info->bytes && !btrfs_free_space_trimmed(bitmap_info)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR] -=
|
|
bitmap_info->bitmap_extents;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] -= bitmap_info->bytes;
|
|
|
|
}
|
|
unlink_free_space(ctl, bitmap_info);
|
|
kmem_cache_free(btrfs_free_space_bitmap_cachep, bitmap_info->bitmap);
|
|
kmem_cache_free(btrfs_free_space_cachep, bitmap_info);
|
|
ctl->total_bitmaps--;
|
|
recalculate_thresholds(ctl);
|
|
}
|
|
|
|
static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *bitmap_info,
|
|
u64 *offset, u64 *bytes)
|
|
{
|
|
u64 end;
|
|
u64 search_start, search_bytes;
|
|
int ret;
|
|
|
|
again:
|
|
end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1;
|
|
|
|
/*
|
|
* We need to search for bits in this bitmap. We could only cover some
|
|
* of the extent in this bitmap thanks to how we add space, so we need
|
|
* to search for as much as it as we can and clear that amount, and then
|
|
* go searching for the next bit.
|
|
*/
|
|
search_start = *offset;
|
|
search_bytes = ctl->unit;
|
|
search_bytes = min(search_bytes, end - search_start + 1);
|
|
ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes,
|
|
false);
|
|
if (ret < 0 || search_start != *offset)
|
|
return -EINVAL;
|
|
|
|
/* We may have found more bits than what we need */
|
|
search_bytes = min(search_bytes, *bytes);
|
|
|
|
/* Cannot clear past the end of the bitmap */
|
|
search_bytes = min(search_bytes, end - search_start + 1);
|
|
|
|
bitmap_clear_bits(ctl, bitmap_info, search_start, search_bytes);
|
|
*offset += search_bytes;
|
|
*bytes -= search_bytes;
|
|
|
|
if (*bytes) {
|
|
struct rb_node *next = rb_next(&bitmap_info->offset_index);
|
|
if (!bitmap_info->bytes)
|
|
free_bitmap(ctl, bitmap_info);
|
|
|
|
/*
|
|
* no entry after this bitmap, but we still have bytes to
|
|
* remove, so something has gone wrong.
|
|
*/
|
|
if (!next)
|
|
return -EINVAL;
|
|
|
|
bitmap_info = rb_entry(next, struct btrfs_free_space,
|
|
offset_index);
|
|
|
|
/*
|
|
* if the next entry isn't a bitmap we need to return to let the
|
|
* extent stuff do its work.
|
|
*/
|
|
if (!bitmap_info->bitmap)
|
|
return -EAGAIN;
|
|
|
|
/*
|
|
* Ok the next item is a bitmap, but it may not actually hold
|
|
* the information for the rest of this free space stuff, so
|
|
* look for it, and if we don't find it return so we can try
|
|
* everything over again.
|
|
*/
|
|
search_start = *offset;
|
|
search_bytes = ctl->unit;
|
|
ret = search_bitmap(ctl, bitmap_info, &search_start,
|
|
&search_bytes, false);
|
|
if (ret < 0 || search_start != *offset)
|
|
return -EAGAIN;
|
|
|
|
goto again;
|
|
} else if (!bitmap_info->bytes)
|
|
free_bitmap(ctl, bitmap_info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info, u64 offset,
|
|
u64 bytes, enum btrfs_trim_state trim_state)
|
|
{
|
|
u64 bytes_to_set = 0;
|
|
u64 end;
|
|
|
|
/*
|
|
* This is a tradeoff to make bitmap trim state minimal. We mark the
|
|
* whole bitmap untrimmed if at any point we add untrimmed regions.
|
|
*/
|
|
if (trim_state == BTRFS_TRIM_STATE_UNTRIMMED) {
|
|
if (btrfs_free_space_trimmed(info)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR] +=
|
|
info->bitmap_extents;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] += info->bytes;
|
|
}
|
|
info->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
}
|
|
|
|
end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit);
|
|
|
|
bytes_to_set = min(end - offset, bytes);
|
|
|
|
bitmap_set_bits(ctl, info, offset, bytes_to_set);
|
|
|
|
/*
|
|
* We set some bytes, we have no idea what the max extent size is
|
|
* anymore.
|
|
*/
|
|
info->max_extent_size = 0;
|
|
|
|
return bytes_to_set;
|
|
|
|
}
|
|
|
|
static bool use_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info)
|
|
{
|
|
struct btrfs_block_group *block_group = ctl->private;
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
bool forced = false;
|
|
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
if (btrfs_should_fragment_free_space(block_group))
|
|
forced = true;
|
|
#endif
|
|
|
|
/* This is a way to reclaim large regions from the bitmaps. */
|
|
if (!forced && info->bytes >= FORCE_EXTENT_THRESHOLD)
|
|
return false;
|
|
|
|
/*
|
|
* If we are below the extents threshold then we can add this as an
|
|
* extent, and don't have to deal with the bitmap
|
|
*/
|
|
if (!forced && ctl->free_extents < ctl->extents_thresh) {
|
|
/*
|
|
* If this block group has some small extents we don't want to
|
|
* use up all of our free slots in the cache with them, we want
|
|
* to reserve them to larger extents, however if we have plenty
|
|
* of cache left then go ahead an dadd them, no sense in adding
|
|
* the overhead of a bitmap if we don't have to.
|
|
*/
|
|
if (info->bytes <= fs_info->sectorsize * 8) {
|
|
if (ctl->free_extents * 3 <= ctl->extents_thresh)
|
|
return false;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The original block groups from mkfs can be really small, like 8
|
|
* megabytes, so don't bother with a bitmap for those entries. However
|
|
* some block groups can be smaller than what a bitmap would cover but
|
|
* are still large enough that they could overflow the 32k memory limit,
|
|
* so allow those block groups to still be allowed to have a bitmap
|
|
* entry.
|
|
*/
|
|
if (((BITS_PER_BITMAP * ctl->unit) >> 1) > block_group->length)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static const struct btrfs_free_space_op free_space_op = {
|
|
.use_bitmap = use_bitmap,
|
|
};
|
|
|
|
static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info)
|
|
{
|
|
struct btrfs_free_space *bitmap_info;
|
|
struct btrfs_block_group *block_group = NULL;
|
|
int added = 0;
|
|
u64 bytes, offset, bytes_added;
|
|
enum btrfs_trim_state trim_state;
|
|
int ret;
|
|
|
|
bytes = info->bytes;
|
|
offset = info->offset;
|
|
trim_state = info->trim_state;
|
|
|
|
if (!ctl->op->use_bitmap(ctl, info))
|
|
return 0;
|
|
|
|
if (ctl->op == &free_space_op)
|
|
block_group = ctl->private;
|
|
again:
|
|
/*
|
|
* Since we link bitmaps right into the cluster we need to see if we
|
|
* have a cluster here, and if so and it has our bitmap we need to add
|
|
* the free space to that bitmap.
|
|
*/
|
|
if (block_group && !list_empty(&block_group->cluster_list)) {
|
|
struct btrfs_free_cluster *cluster;
|
|
struct rb_node *node;
|
|
struct btrfs_free_space *entry;
|
|
|
|
cluster = list_entry(block_group->cluster_list.next,
|
|
struct btrfs_free_cluster,
|
|
block_group_list);
|
|
spin_lock(&cluster->lock);
|
|
node = rb_first(&cluster->root);
|
|
if (!node) {
|
|
spin_unlock(&cluster->lock);
|
|
goto no_cluster_bitmap;
|
|
}
|
|
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
if (!entry->bitmap) {
|
|
spin_unlock(&cluster->lock);
|
|
goto no_cluster_bitmap;
|
|
}
|
|
|
|
if (entry->offset == offset_to_bitmap(ctl, offset)) {
|
|
bytes_added = add_bytes_to_bitmap(ctl, entry, offset,
|
|
bytes, trim_state);
|
|
bytes -= bytes_added;
|
|
offset += bytes_added;
|
|
}
|
|
spin_unlock(&cluster->lock);
|
|
if (!bytes) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
no_cluster_bitmap:
|
|
bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
|
|
1, 0);
|
|
if (!bitmap_info) {
|
|
ASSERT(added == 0);
|
|
goto new_bitmap;
|
|
}
|
|
|
|
bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes,
|
|
trim_state);
|
|
bytes -= bytes_added;
|
|
offset += bytes_added;
|
|
added = 0;
|
|
|
|
if (!bytes) {
|
|
ret = 1;
|
|
goto out;
|
|
} else
|
|
goto again;
|
|
|
|
new_bitmap:
|
|
if (info && info->bitmap) {
|
|
add_new_bitmap(ctl, info, offset);
|
|
added = 1;
|
|
info = NULL;
|
|
goto again;
|
|
} else {
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
/* no pre-allocated info, allocate a new one */
|
|
if (!info) {
|
|
info = kmem_cache_zalloc(btrfs_free_space_cachep,
|
|
GFP_NOFS);
|
|
if (!info) {
|
|
spin_lock(&ctl->tree_lock);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* allocate the bitmap */
|
|
info->bitmap = kmem_cache_zalloc(btrfs_free_space_bitmap_cachep,
|
|
GFP_NOFS);
|
|
info->trim_state = BTRFS_TRIM_STATE_TRIMMED;
|
|
spin_lock(&ctl->tree_lock);
|
|
if (!info->bitmap) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
out:
|
|
if (info) {
|
|
if (info->bitmap)
|
|
kmem_cache_free(btrfs_free_space_bitmap_cachep,
|
|
info->bitmap);
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Free space merging rules:
|
|
* 1) Merge trimmed areas together
|
|
* 2) Let untrimmed areas coalesce with trimmed areas
|
|
* 3) Always pull neighboring regions from bitmaps
|
|
*
|
|
* The above rules are for when we merge free space based on btrfs_trim_state.
|
|
* Rules 2 and 3 are subtle because they are suboptimal, but are done for the
|
|
* same reason: to promote larger extent regions which makes life easier for
|
|
* find_free_extent(). Rule 2 enables coalescing based on the common path
|
|
* being returning free space from btrfs_finish_extent_commit(). So when free
|
|
* space is trimmed, it will prevent aggregating trimmed new region and
|
|
* untrimmed regions in the rb_tree. Rule 3 is purely to obtain larger extents
|
|
* and provide find_free_extent() with the largest extents possible hoping for
|
|
* the reuse path.
|
|
*/
|
|
static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info, bool update_stat)
|
|
{
|
|
struct btrfs_free_space *left_info = NULL;
|
|
struct btrfs_free_space *right_info;
|
|
bool merged = false;
|
|
u64 offset = info->offset;
|
|
u64 bytes = info->bytes;
|
|
const bool is_trimmed = btrfs_free_space_trimmed(info);
|
|
|
|
/*
|
|
* first we want to see if there is free space adjacent to the range we
|
|
* are adding, if there is remove that struct and add a new one to
|
|
* cover the entire range
|
|
*/
|
|
right_info = tree_search_offset(ctl, offset + bytes, 0, 0);
|
|
if (right_info && rb_prev(&right_info->offset_index))
|
|
left_info = rb_entry(rb_prev(&right_info->offset_index),
|
|
struct btrfs_free_space, offset_index);
|
|
else if (!right_info)
|
|
left_info = tree_search_offset(ctl, offset - 1, 0, 0);
|
|
|
|
/* See try_merge_free_space() comment. */
|
|
if (right_info && !right_info->bitmap &&
|
|
(!is_trimmed || btrfs_free_space_trimmed(right_info))) {
|
|
if (update_stat)
|
|
unlink_free_space(ctl, right_info);
|
|
else
|
|
__unlink_free_space(ctl, right_info);
|
|
info->bytes += right_info->bytes;
|
|
kmem_cache_free(btrfs_free_space_cachep, right_info);
|
|
merged = true;
|
|
}
|
|
|
|
/* See try_merge_free_space() comment. */
|
|
if (left_info && !left_info->bitmap &&
|
|
left_info->offset + left_info->bytes == offset &&
|
|
(!is_trimmed || btrfs_free_space_trimmed(left_info))) {
|
|
if (update_stat)
|
|
unlink_free_space(ctl, left_info);
|
|
else
|
|
__unlink_free_space(ctl, left_info);
|
|
info->offset = left_info->offset;
|
|
info->bytes += left_info->bytes;
|
|
kmem_cache_free(btrfs_free_space_cachep, left_info);
|
|
merged = true;
|
|
}
|
|
|
|
return merged;
|
|
}
|
|
|
|
static bool steal_from_bitmap_to_end(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info,
|
|
bool update_stat)
|
|
{
|
|
struct btrfs_free_space *bitmap;
|
|
unsigned long i;
|
|
unsigned long j;
|
|
const u64 end = info->offset + info->bytes;
|
|
const u64 bitmap_offset = offset_to_bitmap(ctl, end);
|
|
u64 bytes;
|
|
|
|
bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0);
|
|
if (!bitmap)
|
|
return false;
|
|
|
|
i = offset_to_bit(bitmap->offset, ctl->unit, end);
|
|
j = find_next_zero_bit(bitmap->bitmap, BITS_PER_BITMAP, i);
|
|
if (j == i)
|
|
return false;
|
|
bytes = (j - i) * ctl->unit;
|
|
info->bytes += bytes;
|
|
|
|
/* See try_merge_free_space() comment. */
|
|
if (!btrfs_free_space_trimmed(bitmap))
|
|
info->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
|
|
if (update_stat)
|
|
bitmap_clear_bits(ctl, bitmap, end, bytes);
|
|
else
|
|
__bitmap_clear_bits(ctl, bitmap, end, bytes);
|
|
|
|
if (!bitmap->bytes)
|
|
free_bitmap(ctl, bitmap);
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool steal_from_bitmap_to_front(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info,
|
|
bool update_stat)
|
|
{
|
|
struct btrfs_free_space *bitmap;
|
|
u64 bitmap_offset;
|
|
unsigned long i;
|
|
unsigned long j;
|
|
unsigned long prev_j;
|
|
u64 bytes;
|
|
|
|
bitmap_offset = offset_to_bitmap(ctl, info->offset);
|
|
/* If we're on a boundary, try the previous logical bitmap. */
|
|
if (bitmap_offset == info->offset) {
|
|
if (info->offset == 0)
|
|
return false;
|
|
bitmap_offset = offset_to_bitmap(ctl, info->offset - 1);
|
|
}
|
|
|
|
bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0);
|
|
if (!bitmap)
|
|
return false;
|
|
|
|
i = offset_to_bit(bitmap->offset, ctl->unit, info->offset) - 1;
|
|
j = 0;
|
|
prev_j = (unsigned long)-1;
|
|
for_each_clear_bit_from(j, bitmap->bitmap, BITS_PER_BITMAP) {
|
|
if (j > i)
|
|
break;
|
|
prev_j = j;
|
|
}
|
|
if (prev_j == i)
|
|
return false;
|
|
|
|
if (prev_j == (unsigned long)-1)
|
|
bytes = (i + 1) * ctl->unit;
|
|
else
|
|
bytes = (i - prev_j) * ctl->unit;
|
|
|
|
info->offset -= bytes;
|
|
info->bytes += bytes;
|
|
|
|
/* See try_merge_free_space() comment. */
|
|
if (!btrfs_free_space_trimmed(bitmap))
|
|
info->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
|
|
if (update_stat)
|
|
bitmap_clear_bits(ctl, bitmap, info->offset, bytes);
|
|
else
|
|
__bitmap_clear_bits(ctl, bitmap, info->offset, bytes);
|
|
|
|
if (!bitmap->bytes)
|
|
free_bitmap(ctl, bitmap);
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* We prefer always to allocate from extent entries, both for clustered and
|
|
* non-clustered allocation requests. So when attempting to add a new extent
|
|
* entry, try to see if there's adjacent free space in bitmap entries, and if
|
|
* there is, migrate that space from the bitmaps to the extent.
|
|
* Like this we get better chances of satisfying space allocation requests
|
|
* because we attempt to satisfy them based on a single cache entry, and never
|
|
* on 2 or more entries - even if the entries represent a contiguous free space
|
|
* region (e.g. 1 extent entry + 1 bitmap entry starting where the extent entry
|
|
* ends).
|
|
*/
|
|
static void steal_from_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *info,
|
|
bool update_stat)
|
|
{
|
|
/*
|
|
* Only work with disconnected entries, as we can change their offset,
|
|
* and must be extent entries.
|
|
*/
|
|
ASSERT(!info->bitmap);
|
|
ASSERT(RB_EMPTY_NODE(&info->offset_index));
|
|
|
|
if (ctl->total_bitmaps > 0) {
|
|
bool stole_end;
|
|
bool stole_front = false;
|
|
|
|
stole_end = steal_from_bitmap_to_end(ctl, info, update_stat);
|
|
if (ctl->total_bitmaps > 0)
|
|
stole_front = steal_from_bitmap_to_front(ctl, info,
|
|
update_stat);
|
|
|
|
if (stole_end || stole_front)
|
|
try_merge_free_space(ctl, info, update_stat);
|
|
}
|
|
}
|
|
|
|
int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_free_space_ctl *ctl,
|
|
u64 offset, u64 bytes,
|
|
enum btrfs_trim_state trim_state)
|
|
{
|
|
struct btrfs_block_group *block_group = ctl->private;
|
|
struct btrfs_free_space *info;
|
|
int ret = 0;
|
|
u64 filter_bytes = bytes;
|
|
|
|
ASSERT(!btrfs_is_zoned(fs_info));
|
|
|
|
info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->offset = offset;
|
|
info->bytes = bytes;
|
|
info->trim_state = trim_state;
|
|
RB_CLEAR_NODE(&info->offset_index);
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
|
|
if (try_merge_free_space(ctl, info, true))
|
|
goto link;
|
|
|
|
/*
|
|
* There was no extent directly to the left or right of this new
|
|
* extent then we know we're going to have to allocate a new extent, so
|
|
* before we do that see if we need to drop this into a bitmap
|
|
*/
|
|
ret = insert_into_bitmap(ctl, info);
|
|
if (ret < 0) {
|
|
goto out;
|
|
} else if (ret) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
link:
|
|
/*
|
|
* Only steal free space from adjacent bitmaps if we're sure we're not
|
|
* going to add the new free space to existing bitmap entries - because
|
|
* that would mean unnecessary work that would be reverted. Therefore
|
|
* attempt to steal space from bitmaps if we're adding an extent entry.
|
|
*/
|
|
steal_from_bitmap(ctl, info, true);
|
|
|
|
filter_bytes = max(filter_bytes, info->bytes);
|
|
|
|
ret = link_free_space(ctl, info);
|
|
if (ret)
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
out:
|
|
btrfs_discard_update_discardable(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
if (ret) {
|
|
btrfs_crit(fs_info, "unable to add free space :%d", ret);
|
|
ASSERT(ret != -EEXIST);
|
|
}
|
|
|
|
if (trim_state != BTRFS_TRIM_STATE_TRIMMED) {
|
|
btrfs_discard_check_filter(block_group, filter_bytes);
|
|
btrfs_discard_queue_work(&fs_info->discard_ctl, block_group);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __btrfs_add_free_space_zoned(struct btrfs_block_group *block_group,
|
|
u64 bytenr, u64 size, bool used)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
u64 offset = bytenr - block_group->start;
|
|
u64 to_free, to_unusable;
|
|
const int bg_reclaim_threshold = READ_ONCE(fs_info->bg_reclaim_threshold);
|
|
bool initial = (size == block_group->length);
|
|
u64 reclaimable_unusable;
|
|
|
|
WARN_ON(!initial && offset + size > block_group->zone_capacity);
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
if (!used)
|
|
to_free = size;
|
|
else if (initial)
|
|
to_free = block_group->zone_capacity;
|
|
else if (offset >= block_group->alloc_offset)
|
|
to_free = size;
|
|
else if (offset + size <= block_group->alloc_offset)
|
|
to_free = 0;
|
|
else
|
|
to_free = offset + size - block_group->alloc_offset;
|
|
to_unusable = size - to_free;
|
|
|
|
ctl->free_space += to_free;
|
|
/*
|
|
* If the block group is read-only, we should account freed space into
|
|
* bytes_readonly.
|
|
*/
|
|
if (!block_group->ro)
|
|
block_group->zone_unusable += to_unusable;
|
|
spin_unlock(&ctl->tree_lock);
|
|
if (!used) {
|
|
spin_lock(&block_group->lock);
|
|
block_group->alloc_offset -= size;
|
|
spin_unlock(&block_group->lock);
|
|
}
|
|
|
|
reclaimable_unusable = block_group->zone_unusable -
|
|
(block_group->length - block_group->zone_capacity);
|
|
/* All the region is now unusable. Mark it as unused and reclaim */
|
|
if (block_group->zone_unusable == block_group->length) {
|
|
btrfs_mark_bg_unused(block_group);
|
|
} else if (bg_reclaim_threshold &&
|
|
reclaimable_unusable >=
|
|
div_factor_fine(block_group->zone_capacity,
|
|
bg_reclaim_threshold)) {
|
|
btrfs_mark_bg_to_reclaim(block_group);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_add_free_space(struct btrfs_block_group *block_group,
|
|
u64 bytenr, u64 size)
|
|
{
|
|
enum btrfs_trim_state trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
|
|
if (btrfs_is_zoned(block_group->fs_info))
|
|
return __btrfs_add_free_space_zoned(block_group, bytenr, size,
|
|
true);
|
|
|
|
if (btrfs_test_opt(block_group->fs_info, DISCARD_SYNC))
|
|
trim_state = BTRFS_TRIM_STATE_TRIMMED;
|
|
|
|
return __btrfs_add_free_space(block_group->fs_info,
|
|
block_group->free_space_ctl,
|
|
bytenr, size, trim_state);
|
|
}
|
|
|
|
int btrfs_add_free_space_unused(struct btrfs_block_group *block_group,
|
|
u64 bytenr, u64 size)
|
|
{
|
|
if (btrfs_is_zoned(block_group->fs_info))
|
|
return __btrfs_add_free_space_zoned(block_group, bytenr, size,
|
|
false);
|
|
|
|
return btrfs_add_free_space(block_group, bytenr, size);
|
|
}
|
|
|
|
/*
|
|
* This is a subtle distinction because when adding free space back in general,
|
|
* we want it to be added as untrimmed for async. But in the case where we add
|
|
* it on loading of a block group, we want to consider it trimmed.
|
|
*/
|
|
int btrfs_add_free_space_async_trimmed(struct btrfs_block_group *block_group,
|
|
u64 bytenr, u64 size)
|
|
{
|
|
enum btrfs_trim_state trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
|
|
if (btrfs_is_zoned(block_group->fs_info))
|
|
return __btrfs_add_free_space_zoned(block_group, bytenr, size,
|
|
true);
|
|
|
|
if (btrfs_test_opt(block_group->fs_info, DISCARD_SYNC) ||
|
|
btrfs_test_opt(block_group->fs_info, DISCARD_ASYNC))
|
|
trim_state = BTRFS_TRIM_STATE_TRIMMED;
|
|
|
|
return __btrfs_add_free_space(block_group->fs_info,
|
|
block_group->free_space_ctl,
|
|
bytenr, size, trim_state);
|
|
}
|
|
|
|
int btrfs_remove_free_space(struct btrfs_block_group *block_group,
|
|
u64 offset, u64 bytes)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *info;
|
|
int ret;
|
|
bool re_search = false;
|
|
|
|
if (btrfs_is_zoned(block_group->fs_info)) {
|
|
/*
|
|
* This can happen with conventional zones when replaying log.
|
|
* Since the allocation info of tree-log nodes are not recorded
|
|
* to the extent-tree, calculate_alloc_pointer() failed to
|
|
* advance the allocation pointer after last allocated tree log
|
|
* node blocks.
|
|
*
|
|
* This function is called from
|
|
* btrfs_pin_extent_for_log_replay() when replaying the log.
|
|
* Advance the pointer not to overwrite the tree-log nodes.
|
|
*/
|
|
if (block_group->start + block_group->alloc_offset <
|
|
offset + bytes) {
|
|
block_group->alloc_offset =
|
|
offset + bytes - block_group->start;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
|
|
again:
|
|
ret = 0;
|
|
if (!bytes)
|
|
goto out_lock;
|
|
|
|
info = tree_search_offset(ctl, offset, 0, 0);
|
|
if (!info) {
|
|
/*
|
|
* oops didn't find an extent that matched the space we wanted
|
|
* to remove, look for a bitmap instead
|
|
*/
|
|
info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
|
|
1, 0);
|
|
if (!info) {
|
|
/*
|
|
* If we found a partial bit of our free space in a
|
|
* bitmap but then couldn't find the other part this may
|
|
* be a problem, so WARN about it.
|
|
*/
|
|
WARN_ON(re_search);
|
|
goto out_lock;
|
|
}
|
|
}
|
|
|
|
re_search = false;
|
|
if (!info->bitmap) {
|
|
unlink_free_space(ctl, info);
|
|
if (offset == info->offset) {
|
|
u64 to_free = min(bytes, info->bytes);
|
|
|
|
info->bytes -= to_free;
|
|
info->offset += to_free;
|
|
if (info->bytes) {
|
|
ret = link_free_space(ctl, info);
|
|
WARN_ON(ret);
|
|
} else {
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
}
|
|
|
|
offset += to_free;
|
|
bytes -= to_free;
|
|
goto again;
|
|
} else {
|
|
u64 old_end = info->bytes + info->offset;
|
|
|
|
info->bytes = offset - info->offset;
|
|
ret = link_free_space(ctl, info);
|
|
WARN_ON(ret);
|
|
if (ret)
|
|
goto out_lock;
|
|
|
|
/* Not enough bytes in this entry to satisfy us */
|
|
if (old_end < offset + bytes) {
|
|
bytes -= old_end - offset;
|
|
offset = old_end;
|
|
goto again;
|
|
} else if (old_end == offset + bytes) {
|
|
/* all done */
|
|
goto out_lock;
|
|
}
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
ret = __btrfs_add_free_space(block_group->fs_info, ctl,
|
|
offset + bytes,
|
|
old_end - (offset + bytes),
|
|
info->trim_state);
|
|
WARN_ON(ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = remove_from_bitmap(ctl, info, &offset, &bytes);
|
|
if (ret == -EAGAIN) {
|
|
re_search = true;
|
|
goto again;
|
|
}
|
|
out_lock:
|
|
btrfs_discard_update_discardable(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_dump_free_space(struct btrfs_block_group *block_group,
|
|
u64 bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *info;
|
|
struct rb_node *n;
|
|
int count = 0;
|
|
|
|
/*
|
|
* Zoned btrfs does not use free space tree and cluster. Just print
|
|
* out the free space after the allocation offset.
|
|
*/
|
|
if (btrfs_is_zoned(fs_info)) {
|
|
btrfs_info(fs_info, "free space %llu active %d",
|
|
block_group->zone_capacity - block_group->alloc_offset,
|
|
block_group->zone_is_active);
|
|
return;
|
|
}
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) {
|
|
info = rb_entry(n, struct btrfs_free_space, offset_index);
|
|
if (info->bytes >= bytes && !block_group->ro)
|
|
count++;
|
|
btrfs_crit(fs_info, "entry offset %llu, bytes %llu, bitmap %s",
|
|
info->offset, info->bytes,
|
|
(info->bitmap) ? "yes" : "no");
|
|
}
|
|
spin_unlock(&ctl->tree_lock);
|
|
btrfs_info(fs_info, "block group has cluster?: %s",
|
|
list_empty(&block_group->cluster_list) ? "no" : "yes");
|
|
btrfs_info(fs_info,
|
|
"%d blocks of free space at or bigger than bytes is", count);
|
|
}
|
|
|
|
void btrfs_init_free_space_ctl(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_space_ctl *ctl)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
|
|
spin_lock_init(&ctl->tree_lock);
|
|
ctl->unit = fs_info->sectorsize;
|
|
ctl->start = block_group->start;
|
|
ctl->private = block_group;
|
|
ctl->op = &free_space_op;
|
|
INIT_LIST_HEAD(&ctl->trimming_ranges);
|
|
mutex_init(&ctl->cache_writeout_mutex);
|
|
|
|
/*
|
|
* we only want to have 32k of ram per block group for keeping
|
|
* track of free space, and if we pass 1/2 of that we want to
|
|
* start converting things over to using bitmaps
|
|
*/
|
|
ctl->extents_thresh = (SZ_32K / 2) / sizeof(struct btrfs_free_space);
|
|
}
|
|
|
|
/*
|
|
* for a given cluster, put all of its extents back into the free
|
|
* space cache. If the block group passed doesn't match the block group
|
|
* pointed to by the cluster, someone else raced in and freed the
|
|
* cluster already. In that case, we just return without changing anything
|
|
*/
|
|
static void __btrfs_return_cluster_to_free_space(
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *entry;
|
|
struct rb_node *node;
|
|
|
|
spin_lock(&cluster->lock);
|
|
if (cluster->block_group != block_group) {
|
|
spin_unlock(&cluster->lock);
|
|
return;
|
|
}
|
|
|
|
cluster->block_group = NULL;
|
|
cluster->window_start = 0;
|
|
list_del_init(&cluster->block_group_list);
|
|
|
|
node = rb_first(&cluster->root);
|
|
while (node) {
|
|
bool bitmap;
|
|
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
node = rb_next(&entry->offset_index);
|
|
rb_erase(&entry->offset_index, &cluster->root);
|
|
RB_CLEAR_NODE(&entry->offset_index);
|
|
|
|
bitmap = (entry->bitmap != NULL);
|
|
if (!bitmap) {
|
|
/* Merging treats extents as if they were new */
|
|
if (!btrfs_free_space_trimmed(entry)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR]--;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] -=
|
|
entry->bytes;
|
|
}
|
|
|
|
try_merge_free_space(ctl, entry, false);
|
|
steal_from_bitmap(ctl, entry, false);
|
|
|
|
/* As we insert directly, update these statistics */
|
|
if (!btrfs_free_space_trimmed(entry)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR]++;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] +=
|
|
entry->bytes;
|
|
}
|
|
}
|
|
tree_insert_offset(&ctl->free_space_offset,
|
|
entry->offset, &entry->offset_index, bitmap);
|
|
}
|
|
cluster->root = RB_ROOT;
|
|
spin_unlock(&cluster->lock);
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
|
|
static void __btrfs_remove_free_space_cache_locked(
|
|
struct btrfs_free_space_ctl *ctl)
|
|
{
|
|
struct btrfs_free_space *info;
|
|
struct rb_node *node;
|
|
|
|
while ((node = rb_last(&ctl->free_space_offset)) != NULL) {
|
|
info = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
if (!info->bitmap) {
|
|
unlink_free_space(ctl, info);
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
} else {
|
|
free_bitmap(ctl, info);
|
|
}
|
|
|
|
cond_resched_lock(&ctl->tree_lock);
|
|
}
|
|
}
|
|
|
|
void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl)
|
|
{
|
|
spin_lock(&ctl->tree_lock);
|
|
__btrfs_remove_free_space_cache_locked(ctl);
|
|
if (ctl->private)
|
|
btrfs_discard_update_discardable(ctl->private);
|
|
spin_unlock(&ctl->tree_lock);
|
|
}
|
|
|
|
void btrfs_remove_free_space_cache(struct btrfs_block_group *block_group)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_cluster *cluster;
|
|
struct list_head *head;
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
while ((head = block_group->cluster_list.next) !=
|
|
&block_group->cluster_list) {
|
|
cluster = list_entry(head, struct btrfs_free_cluster,
|
|
block_group_list);
|
|
|
|
WARN_ON(cluster->block_group != block_group);
|
|
__btrfs_return_cluster_to_free_space(block_group, cluster);
|
|
|
|
cond_resched_lock(&ctl->tree_lock);
|
|
}
|
|
__btrfs_remove_free_space_cache_locked(ctl);
|
|
btrfs_discard_update_discardable(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
}
|
|
|
|
/**
|
|
* btrfs_is_free_space_trimmed - see if everything is trimmed
|
|
* @block_group: block_group of interest
|
|
*
|
|
* Walk @block_group's free space rb_tree to determine if everything is trimmed.
|
|
*/
|
|
bool btrfs_is_free_space_trimmed(struct btrfs_block_group *block_group)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *info;
|
|
struct rb_node *node;
|
|
bool ret = true;
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
node = rb_first(&ctl->free_space_offset);
|
|
|
|
while (node) {
|
|
info = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
|
|
if (!btrfs_free_space_trimmed(info)) {
|
|
ret = false;
|
|
break;
|
|
}
|
|
|
|
node = rb_next(node);
|
|
}
|
|
|
|
spin_unlock(&ctl->tree_lock);
|
|
return ret;
|
|
}
|
|
|
|
u64 btrfs_find_space_for_alloc(struct btrfs_block_group *block_group,
|
|
u64 offset, u64 bytes, u64 empty_size,
|
|
u64 *max_extent_size)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_discard_ctl *discard_ctl =
|
|
&block_group->fs_info->discard_ctl;
|
|
struct btrfs_free_space *entry = NULL;
|
|
u64 bytes_search = bytes + empty_size;
|
|
u64 ret = 0;
|
|
u64 align_gap = 0;
|
|
u64 align_gap_len = 0;
|
|
enum btrfs_trim_state align_gap_trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
|
|
ASSERT(!btrfs_is_zoned(block_group->fs_info));
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
entry = find_free_space(ctl, &offset, &bytes_search,
|
|
block_group->full_stripe_len, max_extent_size);
|
|
if (!entry)
|
|
goto out;
|
|
|
|
ret = offset;
|
|
if (entry->bitmap) {
|
|
bitmap_clear_bits(ctl, entry, offset, bytes);
|
|
|
|
if (!btrfs_free_space_trimmed(entry))
|
|
atomic64_add(bytes, &discard_ctl->discard_bytes_saved);
|
|
|
|
if (!entry->bytes)
|
|
free_bitmap(ctl, entry);
|
|
} else {
|
|
unlink_free_space(ctl, entry);
|
|
align_gap_len = offset - entry->offset;
|
|
align_gap = entry->offset;
|
|
align_gap_trim_state = entry->trim_state;
|
|
|
|
if (!btrfs_free_space_trimmed(entry))
|
|
atomic64_add(bytes, &discard_ctl->discard_bytes_saved);
|
|
|
|
entry->offset = offset + bytes;
|
|
WARN_ON(entry->bytes < bytes + align_gap_len);
|
|
|
|
entry->bytes -= bytes + align_gap_len;
|
|
if (!entry->bytes)
|
|
kmem_cache_free(btrfs_free_space_cachep, entry);
|
|
else
|
|
link_free_space(ctl, entry);
|
|
}
|
|
out:
|
|
btrfs_discard_update_discardable(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
if (align_gap_len)
|
|
__btrfs_add_free_space(block_group->fs_info, ctl,
|
|
align_gap, align_gap_len,
|
|
align_gap_trim_state);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* given a cluster, put all of its extents back into the free space
|
|
* cache. If a block group is passed, this function will only free
|
|
* a cluster that belongs to the passed block group.
|
|
*
|
|
* Otherwise, it'll get a reference on the block group pointed to by the
|
|
* cluster and remove the cluster from it.
|
|
*/
|
|
void btrfs_return_cluster_to_free_space(
|
|
struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl;
|
|
|
|
/* first, get a safe pointer to the block group */
|
|
spin_lock(&cluster->lock);
|
|
if (!block_group) {
|
|
block_group = cluster->block_group;
|
|
if (!block_group) {
|
|
spin_unlock(&cluster->lock);
|
|
return;
|
|
}
|
|
} else if (cluster->block_group != block_group) {
|
|
/* someone else has already freed it don't redo their work */
|
|
spin_unlock(&cluster->lock);
|
|
return;
|
|
}
|
|
btrfs_get_block_group(block_group);
|
|
spin_unlock(&cluster->lock);
|
|
|
|
ctl = block_group->free_space_ctl;
|
|
|
|
/* now return any extents the cluster had on it */
|
|
spin_lock(&ctl->tree_lock);
|
|
__btrfs_return_cluster_to_free_space(block_group, cluster);
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
btrfs_discard_queue_work(&block_group->fs_info->discard_ctl, block_group);
|
|
|
|
/* finally drop our ref */
|
|
btrfs_put_block_group(block_group);
|
|
}
|
|
|
|
static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster,
|
|
struct btrfs_free_space *entry,
|
|
u64 bytes, u64 min_start,
|
|
u64 *max_extent_size)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
int err;
|
|
u64 search_start = cluster->window_start;
|
|
u64 search_bytes = bytes;
|
|
u64 ret = 0;
|
|
|
|
search_start = min_start;
|
|
search_bytes = bytes;
|
|
|
|
err = search_bitmap(ctl, entry, &search_start, &search_bytes, true);
|
|
if (err) {
|
|
*max_extent_size = max(get_max_extent_size(entry),
|
|
*max_extent_size);
|
|
return 0;
|
|
}
|
|
|
|
ret = search_start;
|
|
__bitmap_clear_bits(ctl, entry, ret, bytes);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* given a cluster, try to allocate 'bytes' from it, returns 0
|
|
* if it couldn't find anything suitably large, or a logical disk offset
|
|
* if things worked out
|
|
*/
|
|
u64 btrfs_alloc_from_cluster(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster, u64 bytes,
|
|
u64 min_start, u64 *max_extent_size)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_discard_ctl *discard_ctl =
|
|
&block_group->fs_info->discard_ctl;
|
|
struct btrfs_free_space *entry = NULL;
|
|
struct rb_node *node;
|
|
u64 ret = 0;
|
|
|
|
ASSERT(!btrfs_is_zoned(block_group->fs_info));
|
|
|
|
spin_lock(&cluster->lock);
|
|
if (bytes > cluster->max_size)
|
|
goto out;
|
|
|
|
if (cluster->block_group != block_group)
|
|
goto out;
|
|
|
|
node = rb_first(&cluster->root);
|
|
if (!node)
|
|
goto out;
|
|
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
while (1) {
|
|
if (entry->bytes < bytes)
|
|
*max_extent_size = max(get_max_extent_size(entry),
|
|
*max_extent_size);
|
|
|
|
if (entry->bytes < bytes ||
|
|
(!entry->bitmap && entry->offset < min_start)) {
|
|
node = rb_next(&entry->offset_index);
|
|
if (!node)
|
|
break;
|
|
entry = rb_entry(node, struct btrfs_free_space,
|
|
offset_index);
|
|
continue;
|
|
}
|
|
|
|
if (entry->bitmap) {
|
|
ret = btrfs_alloc_from_bitmap(block_group,
|
|
cluster, entry, bytes,
|
|
cluster->window_start,
|
|
max_extent_size);
|
|
if (ret == 0) {
|
|
node = rb_next(&entry->offset_index);
|
|
if (!node)
|
|
break;
|
|
entry = rb_entry(node, struct btrfs_free_space,
|
|
offset_index);
|
|
continue;
|
|
}
|
|
cluster->window_start += bytes;
|
|
} else {
|
|
ret = entry->offset;
|
|
|
|
entry->offset += bytes;
|
|
entry->bytes -= bytes;
|
|
}
|
|
|
|
break;
|
|
}
|
|
out:
|
|
spin_unlock(&cluster->lock);
|
|
|
|
if (!ret)
|
|
return 0;
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
|
|
if (!btrfs_free_space_trimmed(entry))
|
|
atomic64_add(bytes, &discard_ctl->discard_bytes_saved);
|
|
|
|
ctl->free_space -= bytes;
|
|
if (!entry->bitmap && !btrfs_free_space_trimmed(entry))
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] -= bytes;
|
|
|
|
spin_lock(&cluster->lock);
|
|
if (entry->bytes == 0) {
|
|
rb_erase(&entry->offset_index, &cluster->root);
|
|
ctl->free_extents--;
|
|
if (entry->bitmap) {
|
|
kmem_cache_free(btrfs_free_space_bitmap_cachep,
|
|
entry->bitmap);
|
|
ctl->total_bitmaps--;
|
|
recalculate_thresholds(ctl);
|
|
} else if (!btrfs_free_space_trimmed(entry)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR]--;
|
|
}
|
|
kmem_cache_free(btrfs_free_space_cachep, entry);
|
|
}
|
|
|
|
spin_unlock(&cluster->lock);
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_bitmap_cluster(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_space *entry,
|
|
struct btrfs_free_cluster *cluster,
|
|
u64 offset, u64 bytes,
|
|
u64 cont1_bytes, u64 min_bytes)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
unsigned long next_zero;
|
|
unsigned long i;
|
|
unsigned long want_bits;
|
|
unsigned long min_bits;
|
|
unsigned long found_bits;
|
|
unsigned long max_bits = 0;
|
|
unsigned long start = 0;
|
|
unsigned long total_found = 0;
|
|
int ret;
|
|
|
|
i = offset_to_bit(entry->offset, ctl->unit,
|
|
max_t(u64, offset, entry->offset));
|
|
want_bits = bytes_to_bits(bytes, ctl->unit);
|
|
min_bits = bytes_to_bits(min_bytes, ctl->unit);
|
|
|
|
/*
|
|
* Don't bother looking for a cluster in this bitmap if it's heavily
|
|
* fragmented.
|
|
*/
|
|
if (entry->max_extent_size &&
|
|
entry->max_extent_size < cont1_bytes)
|
|
return -ENOSPC;
|
|
again:
|
|
found_bits = 0;
|
|
for_each_set_bit_from(i, entry->bitmap, BITS_PER_BITMAP) {
|
|
next_zero = find_next_zero_bit(entry->bitmap,
|
|
BITS_PER_BITMAP, i);
|
|
if (next_zero - i >= min_bits) {
|
|
found_bits = next_zero - i;
|
|
if (found_bits > max_bits)
|
|
max_bits = found_bits;
|
|
break;
|
|
}
|
|
if (next_zero - i > max_bits)
|
|
max_bits = next_zero - i;
|
|
i = next_zero;
|
|
}
|
|
|
|
if (!found_bits) {
|
|
entry->max_extent_size = (u64)max_bits * ctl->unit;
|
|
return -ENOSPC;
|
|
}
|
|
|
|
if (!total_found) {
|
|
start = i;
|
|
cluster->max_size = 0;
|
|
}
|
|
|
|
total_found += found_bits;
|
|
|
|
if (cluster->max_size < found_bits * ctl->unit)
|
|
cluster->max_size = found_bits * ctl->unit;
|
|
|
|
if (total_found < want_bits || cluster->max_size < cont1_bytes) {
|
|
i = next_zero + 1;
|
|
goto again;
|
|
}
|
|
|
|
cluster->window_start = start * ctl->unit + entry->offset;
|
|
rb_erase(&entry->offset_index, &ctl->free_space_offset);
|
|
ret = tree_insert_offset(&cluster->root, entry->offset,
|
|
&entry->offset_index, 1);
|
|
ASSERT(!ret); /* -EEXIST; Logic error */
|
|
|
|
trace_btrfs_setup_cluster(block_group, cluster,
|
|
total_found * ctl->unit, 1);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This searches the block group for just extents to fill the cluster with.
|
|
* Try to find a cluster with at least bytes total bytes, at least one
|
|
* extent of cont1_bytes, and other clusters of at least min_bytes.
|
|
*/
|
|
static noinline int
|
|
setup_cluster_no_bitmap(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster,
|
|
struct list_head *bitmaps, u64 offset, u64 bytes,
|
|
u64 cont1_bytes, u64 min_bytes)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *first = NULL;
|
|
struct btrfs_free_space *entry = NULL;
|
|
struct btrfs_free_space *last;
|
|
struct rb_node *node;
|
|
u64 window_free;
|
|
u64 max_extent;
|
|
u64 total_size = 0;
|
|
|
|
entry = tree_search_offset(ctl, offset, 0, 1);
|
|
if (!entry)
|
|
return -ENOSPC;
|
|
|
|
/*
|
|
* We don't want bitmaps, so just move along until we find a normal
|
|
* extent entry.
|
|
*/
|
|
while (entry->bitmap || entry->bytes < min_bytes) {
|
|
if (entry->bitmap && list_empty(&entry->list))
|
|
list_add_tail(&entry->list, bitmaps);
|
|
node = rb_next(&entry->offset_index);
|
|
if (!node)
|
|
return -ENOSPC;
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
}
|
|
|
|
window_free = entry->bytes;
|
|
max_extent = entry->bytes;
|
|
first = entry;
|
|
last = entry;
|
|
|
|
for (node = rb_next(&entry->offset_index); node;
|
|
node = rb_next(&entry->offset_index)) {
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
|
|
if (entry->bitmap) {
|
|
if (list_empty(&entry->list))
|
|
list_add_tail(&entry->list, bitmaps);
|
|
continue;
|
|
}
|
|
|
|
if (entry->bytes < min_bytes)
|
|
continue;
|
|
|
|
last = entry;
|
|
window_free += entry->bytes;
|
|
if (entry->bytes > max_extent)
|
|
max_extent = entry->bytes;
|
|
}
|
|
|
|
if (window_free < bytes || max_extent < cont1_bytes)
|
|
return -ENOSPC;
|
|
|
|
cluster->window_start = first->offset;
|
|
|
|
node = &first->offset_index;
|
|
|
|
/*
|
|
* now we've found our entries, pull them out of the free space
|
|
* cache and put them into the cluster rbtree
|
|
*/
|
|
do {
|
|
int ret;
|
|
|
|
entry = rb_entry(node, struct btrfs_free_space, offset_index);
|
|
node = rb_next(&entry->offset_index);
|
|
if (entry->bitmap || entry->bytes < min_bytes)
|
|
continue;
|
|
|
|
rb_erase(&entry->offset_index, &ctl->free_space_offset);
|
|
ret = tree_insert_offset(&cluster->root, entry->offset,
|
|
&entry->offset_index, 0);
|
|
total_size += entry->bytes;
|
|
ASSERT(!ret); /* -EEXIST; Logic error */
|
|
} while (node && entry != last);
|
|
|
|
cluster->max_size = max_extent;
|
|
trace_btrfs_setup_cluster(block_group, cluster, total_size, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This specifically looks for bitmaps that may work in the cluster, we assume
|
|
* that we have already failed to find extents that will work.
|
|
*/
|
|
static noinline int
|
|
setup_cluster_bitmap(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster,
|
|
struct list_head *bitmaps, u64 offset, u64 bytes,
|
|
u64 cont1_bytes, u64 min_bytes)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *entry = NULL;
|
|
int ret = -ENOSPC;
|
|
u64 bitmap_offset = offset_to_bitmap(ctl, offset);
|
|
|
|
if (ctl->total_bitmaps == 0)
|
|
return -ENOSPC;
|
|
|
|
/*
|
|
* The bitmap that covers offset won't be in the list unless offset
|
|
* is just its start offset.
|
|
*/
|
|
if (!list_empty(bitmaps))
|
|
entry = list_first_entry(bitmaps, struct btrfs_free_space, list);
|
|
|
|
if (!entry || entry->offset != bitmap_offset) {
|
|
entry = tree_search_offset(ctl, bitmap_offset, 1, 0);
|
|
if (entry && list_empty(&entry->list))
|
|
list_add(&entry->list, bitmaps);
|
|
}
|
|
|
|
list_for_each_entry(entry, bitmaps, list) {
|
|
if (entry->bytes < bytes)
|
|
continue;
|
|
ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset,
|
|
bytes, cont1_bytes, min_bytes);
|
|
if (!ret)
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The bitmaps list has all the bitmaps that record free space
|
|
* starting after offset, so no more search is required.
|
|
*/
|
|
return -ENOSPC;
|
|
}
|
|
|
|
/*
|
|
* here we try to find a cluster of blocks in a block group. The goal
|
|
* is to find at least bytes+empty_size.
|
|
* We might not find them all in one contiguous area.
|
|
*
|
|
* returns zero and sets up cluster if things worked out, otherwise
|
|
* it returns -enospc
|
|
*/
|
|
int btrfs_find_space_cluster(struct btrfs_block_group *block_group,
|
|
struct btrfs_free_cluster *cluster,
|
|
u64 offset, u64 bytes, u64 empty_size)
|
|
{
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *entry, *tmp;
|
|
LIST_HEAD(bitmaps);
|
|
u64 min_bytes;
|
|
u64 cont1_bytes;
|
|
int ret;
|
|
|
|
/*
|
|
* Choose the minimum extent size we'll require for this
|
|
* cluster. For SSD_SPREAD, don't allow any fragmentation.
|
|
* For metadata, allow allocates with smaller extents. For
|
|
* data, keep it dense.
|
|
*/
|
|
if (btrfs_test_opt(fs_info, SSD_SPREAD)) {
|
|
cont1_bytes = min_bytes = bytes + empty_size;
|
|
} else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) {
|
|
cont1_bytes = bytes;
|
|
min_bytes = fs_info->sectorsize;
|
|
} else {
|
|
cont1_bytes = max(bytes, (bytes + empty_size) >> 2);
|
|
min_bytes = fs_info->sectorsize;
|
|
}
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
|
|
/*
|
|
* If we know we don't have enough space to make a cluster don't even
|
|
* bother doing all the work to try and find one.
|
|
*/
|
|
if (ctl->free_space < bytes) {
|
|
spin_unlock(&ctl->tree_lock);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
spin_lock(&cluster->lock);
|
|
|
|
/* someone already found a cluster, hooray */
|
|
if (cluster->block_group) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
trace_btrfs_find_cluster(block_group, offset, bytes, empty_size,
|
|
min_bytes);
|
|
|
|
ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset,
|
|
bytes + empty_size,
|
|
cont1_bytes, min_bytes);
|
|
if (ret)
|
|
ret = setup_cluster_bitmap(block_group, cluster, &bitmaps,
|
|
offset, bytes + empty_size,
|
|
cont1_bytes, min_bytes);
|
|
|
|
/* Clear our temporary list */
|
|
list_for_each_entry_safe(entry, tmp, &bitmaps, list)
|
|
list_del_init(&entry->list);
|
|
|
|
if (!ret) {
|
|
btrfs_get_block_group(block_group);
|
|
list_add_tail(&cluster->block_group_list,
|
|
&block_group->cluster_list);
|
|
cluster->block_group = block_group;
|
|
} else {
|
|
trace_btrfs_failed_cluster_setup(block_group);
|
|
}
|
|
out:
|
|
spin_unlock(&cluster->lock);
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* simple code to zero out a cluster
|
|
*/
|
|
void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster)
|
|
{
|
|
spin_lock_init(&cluster->lock);
|
|
spin_lock_init(&cluster->refill_lock);
|
|
cluster->root = RB_ROOT;
|
|
cluster->max_size = 0;
|
|
cluster->fragmented = false;
|
|
INIT_LIST_HEAD(&cluster->block_group_list);
|
|
cluster->block_group = NULL;
|
|
}
|
|
|
|
static int do_trimming(struct btrfs_block_group *block_group,
|
|
u64 *total_trimmed, u64 start, u64 bytes,
|
|
u64 reserved_start, u64 reserved_bytes,
|
|
enum btrfs_trim_state reserved_trim_state,
|
|
struct btrfs_trim_range *trim_entry)
|
|
{
|
|
struct btrfs_space_info *space_info = block_group->space_info;
|
|
struct btrfs_fs_info *fs_info = block_group->fs_info;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
int ret;
|
|
int update = 0;
|
|
const u64 end = start + bytes;
|
|
const u64 reserved_end = reserved_start + reserved_bytes;
|
|
enum btrfs_trim_state trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
u64 trimmed = 0;
|
|
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&block_group->lock);
|
|
if (!block_group->ro) {
|
|
block_group->reserved += reserved_bytes;
|
|
space_info->bytes_reserved += reserved_bytes;
|
|
update = 1;
|
|
}
|
|
spin_unlock(&block_group->lock);
|
|
spin_unlock(&space_info->lock);
|
|
|
|
ret = btrfs_discard_extent(fs_info, start, bytes, &trimmed);
|
|
if (!ret) {
|
|
*total_trimmed += trimmed;
|
|
trim_state = BTRFS_TRIM_STATE_TRIMMED;
|
|
}
|
|
|
|
mutex_lock(&ctl->cache_writeout_mutex);
|
|
if (reserved_start < start)
|
|
__btrfs_add_free_space(fs_info, ctl, reserved_start,
|
|
start - reserved_start,
|
|
reserved_trim_state);
|
|
if (start + bytes < reserved_start + reserved_bytes)
|
|
__btrfs_add_free_space(fs_info, ctl, end, reserved_end - end,
|
|
reserved_trim_state);
|
|
__btrfs_add_free_space(fs_info, ctl, start, bytes, trim_state);
|
|
list_del(&trim_entry->list);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
|
|
if (update) {
|
|
spin_lock(&space_info->lock);
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->ro)
|
|
space_info->bytes_readonly += reserved_bytes;
|
|
block_group->reserved -= reserved_bytes;
|
|
space_info->bytes_reserved -= reserved_bytes;
|
|
spin_unlock(&block_group->lock);
|
|
spin_unlock(&space_info->lock);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If @async is set, then we will trim 1 region and return.
|
|
*/
|
|
static int trim_no_bitmap(struct btrfs_block_group *block_group,
|
|
u64 *total_trimmed, u64 start, u64 end, u64 minlen,
|
|
bool async)
|
|
{
|
|
struct btrfs_discard_ctl *discard_ctl =
|
|
&block_group->fs_info->discard_ctl;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *entry;
|
|
struct rb_node *node;
|
|
int ret = 0;
|
|
u64 extent_start;
|
|
u64 extent_bytes;
|
|
enum btrfs_trim_state extent_trim_state;
|
|
u64 bytes;
|
|
const u64 max_discard_size = READ_ONCE(discard_ctl->max_discard_size);
|
|
|
|
while (start < end) {
|
|
struct btrfs_trim_range trim_entry;
|
|
|
|
mutex_lock(&ctl->cache_writeout_mutex);
|
|
spin_lock(&ctl->tree_lock);
|
|
|
|
if (ctl->free_space < minlen)
|
|
goto out_unlock;
|
|
|
|
entry = tree_search_offset(ctl, start, 0, 1);
|
|
if (!entry)
|
|
goto out_unlock;
|
|
|
|
/* Skip bitmaps and if async, already trimmed entries */
|
|
while (entry->bitmap ||
|
|
(async && btrfs_free_space_trimmed(entry))) {
|
|
node = rb_next(&entry->offset_index);
|
|
if (!node)
|
|
goto out_unlock;
|
|
entry = rb_entry(node, struct btrfs_free_space,
|
|
offset_index);
|
|
}
|
|
|
|
if (entry->offset >= end)
|
|
goto out_unlock;
|
|
|
|
extent_start = entry->offset;
|
|
extent_bytes = entry->bytes;
|
|
extent_trim_state = entry->trim_state;
|
|
if (async) {
|
|
start = entry->offset;
|
|
bytes = entry->bytes;
|
|
if (bytes < minlen) {
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
goto next;
|
|
}
|
|
unlink_free_space(ctl, entry);
|
|
/*
|
|
* Let bytes = BTRFS_MAX_DISCARD_SIZE + X.
|
|
* If X < BTRFS_ASYNC_DISCARD_MIN_FILTER, we won't trim
|
|
* X when we come back around. So trim it now.
|
|
*/
|
|
if (max_discard_size &&
|
|
bytes >= (max_discard_size +
|
|
BTRFS_ASYNC_DISCARD_MIN_FILTER)) {
|
|
bytes = max_discard_size;
|
|
extent_bytes = max_discard_size;
|
|
entry->offset += max_discard_size;
|
|
entry->bytes -= max_discard_size;
|
|
link_free_space(ctl, entry);
|
|
} else {
|
|
kmem_cache_free(btrfs_free_space_cachep, entry);
|
|
}
|
|
} else {
|
|
start = max(start, extent_start);
|
|
bytes = min(extent_start + extent_bytes, end) - start;
|
|
if (bytes < minlen) {
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
goto next;
|
|
}
|
|
|
|
unlink_free_space(ctl, entry);
|
|
kmem_cache_free(btrfs_free_space_cachep, entry);
|
|
}
|
|
|
|
spin_unlock(&ctl->tree_lock);
|
|
trim_entry.start = extent_start;
|
|
trim_entry.bytes = extent_bytes;
|
|
list_add_tail(&trim_entry.list, &ctl->trimming_ranges);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
|
|
ret = do_trimming(block_group, total_trimmed, start, bytes,
|
|
extent_start, extent_bytes, extent_trim_state,
|
|
&trim_entry);
|
|
if (ret) {
|
|
block_group->discard_cursor = start + bytes;
|
|
break;
|
|
}
|
|
next:
|
|
start += bytes;
|
|
block_group->discard_cursor = start;
|
|
if (async && *total_trimmed)
|
|
break;
|
|
|
|
if (fatal_signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
return ret;
|
|
|
|
out_unlock:
|
|
block_group->discard_cursor = btrfs_block_group_end(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* If we break out of trimming a bitmap prematurely, we should reset the
|
|
* trimming bit. In a rather contrieved case, it's possible to race here so
|
|
* reset the state to BTRFS_TRIM_STATE_UNTRIMMED.
|
|
*
|
|
* start = start of bitmap
|
|
* end = near end of bitmap
|
|
*
|
|
* Thread 1: Thread 2:
|
|
* trim_bitmaps(start)
|
|
* trim_bitmaps(end)
|
|
* end_trimming_bitmap()
|
|
* reset_trimming_bitmap()
|
|
*/
|
|
static void reset_trimming_bitmap(struct btrfs_free_space_ctl *ctl, u64 offset)
|
|
{
|
|
struct btrfs_free_space *entry;
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
entry = tree_search_offset(ctl, offset, 1, 0);
|
|
if (entry) {
|
|
if (btrfs_free_space_trimmed(entry)) {
|
|
ctl->discardable_extents[BTRFS_STAT_CURR] +=
|
|
entry->bitmap_extents;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] += entry->bytes;
|
|
}
|
|
entry->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
}
|
|
|
|
spin_unlock(&ctl->tree_lock);
|
|
}
|
|
|
|
static void end_trimming_bitmap(struct btrfs_free_space_ctl *ctl,
|
|
struct btrfs_free_space *entry)
|
|
{
|
|
if (btrfs_free_space_trimming_bitmap(entry)) {
|
|
entry->trim_state = BTRFS_TRIM_STATE_TRIMMED;
|
|
ctl->discardable_extents[BTRFS_STAT_CURR] -=
|
|
entry->bitmap_extents;
|
|
ctl->discardable_bytes[BTRFS_STAT_CURR] -= entry->bytes;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If @async is set, then we will trim 1 region and return.
|
|
*/
|
|
static int trim_bitmaps(struct btrfs_block_group *block_group,
|
|
u64 *total_trimmed, u64 start, u64 end, u64 minlen,
|
|
u64 maxlen, bool async)
|
|
{
|
|
struct btrfs_discard_ctl *discard_ctl =
|
|
&block_group->fs_info->discard_ctl;
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
struct btrfs_free_space *entry;
|
|
int ret = 0;
|
|
int ret2;
|
|
u64 bytes;
|
|
u64 offset = offset_to_bitmap(ctl, start);
|
|
const u64 max_discard_size = READ_ONCE(discard_ctl->max_discard_size);
|
|
|
|
while (offset < end) {
|
|
bool next_bitmap = false;
|
|
struct btrfs_trim_range trim_entry;
|
|
|
|
mutex_lock(&ctl->cache_writeout_mutex);
|
|
spin_lock(&ctl->tree_lock);
|
|
|
|
if (ctl->free_space < minlen) {
|
|
block_group->discard_cursor =
|
|
btrfs_block_group_end(block_group);
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
break;
|
|
}
|
|
|
|
entry = tree_search_offset(ctl, offset, 1, 0);
|
|
/*
|
|
* Bitmaps are marked trimmed lossily now to prevent constant
|
|
* discarding of the same bitmap (the reason why we are bound
|
|
* by the filters). So, retrim the block group bitmaps when we
|
|
* are preparing to punt to the unused_bgs list. This uses
|
|
* @minlen to determine if we are in BTRFS_DISCARD_INDEX_UNUSED
|
|
* which is the only discard index which sets minlen to 0.
|
|
*/
|
|
if (!entry || (async && minlen && start == offset &&
|
|
btrfs_free_space_trimmed(entry))) {
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
next_bitmap = true;
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* Async discard bitmap trimming begins at by setting the start
|
|
* to be key.objectid and the offset_to_bitmap() aligns to the
|
|
* start of the bitmap. This lets us know we are fully
|
|
* scanning the bitmap rather than only some portion of it.
|
|
*/
|
|
if (start == offset)
|
|
entry->trim_state = BTRFS_TRIM_STATE_TRIMMING;
|
|
|
|
bytes = minlen;
|
|
ret2 = search_bitmap(ctl, entry, &start, &bytes, false);
|
|
if (ret2 || start >= end) {
|
|
/*
|
|
* We lossily consider a bitmap trimmed if we only skip
|
|
* over regions <= BTRFS_ASYNC_DISCARD_MIN_FILTER.
|
|
*/
|
|
if (ret2 && minlen <= BTRFS_ASYNC_DISCARD_MIN_FILTER)
|
|
end_trimming_bitmap(ctl, entry);
|
|
else
|
|
entry->trim_state = BTRFS_TRIM_STATE_UNTRIMMED;
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
next_bitmap = true;
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* We already trimmed a region, but are using the locking above
|
|
* to reset the trim_state.
|
|
*/
|
|
if (async && *total_trimmed) {
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
goto out;
|
|
}
|
|
|
|
bytes = min(bytes, end - start);
|
|
if (bytes < minlen || (async && maxlen && bytes > maxlen)) {
|
|
spin_unlock(&ctl->tree_lock);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
goto next;
|
|
}
|
|
|
|
/*
|
|
* Let bytes = BTRFS_MAX_DISCARD_SIZE + X.
|
|
* If X < @minlen, we won't trim X when we come back around.
|
|
* So trim it now. We differ here from trimming extents as we
|
|
* don't keep individual state per bit.
|
|
*/
|
|
if (async &&
|
|
max_discard_size &&
|
|
bytes > (max_discard_size + minlen))
|
|
bytes = max_discard_size;
|
|
|
|
bitmap_clear_bits(ctl, entry, start, bytes);
|
|
if (entry->bytes == 0)
|
|
free_bitmap(ctl, entry);
|
|
|
|
spin_unlock(&ctl->tree_lock);
|
|
trim_entry.start = start;
|
|
trim_entry.bytes = bytes;
|
|
list_add_tail(&trim_entry.list, &ctl->trimming_ranges);
|
|
mutex_unlock(&ctl->cache_writeout_mutex);
|
|
|
|
ret = do_trimming(block_group, total_trimmed, start, bytes,
|
|
start, bytes, 0, &trim_entry);
|
|
if (ret) {
|
|
reset_trimming_bitmap(ctl, offset);
|
|
block_group->discard_cursor =
|
|
btrfs_block_group_end(block_group);
|
|
break;
|
|
}
|
|
next:
|
|
if (next_bitmap) {
|
|
offset += BITS_PER_BITMAP * ctl->unit;
|
|
start = offset;
|
|
} else {
|
|
start += bytes;
|
|
}
|
|
block_group->discard_cursor = start;
|
|
|
|
if (fatal_signal_pending(current)) {
|
|
if (start != offset)
|
|
reset_trimming_bitmap(ctl, offset);
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
cond_resched();
|
|
}
|
|
|
|
if (offset >= end)
|
|
block_group->discard_cursor = end;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_trim_block_group(struct btrfs_block_group *block_group,
|
|
u64 *trimmed, u64 start, u64 end, u64 minlen)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
|
|
int ret;
|
|
u64 rem = 0;
|
|
|
|
ASSERT(!btrfs_is_zoned(block_group->fs_info));
|
|
|
|
*trimmed = 0;
|
|
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->removed) {
|
|
spin_unlock(&block_group->lock);
|
|
return 0;
|
|
}
|
|
btrfs_freeze_block_group(block_group);
|
|
spin_unlock(&block_group->lock);
|
|
|
|
ret = trim_no_bitmap(block_group, trimmed, start, end, minlen, false);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = trim_bitmaps(block_group, trimmed, start, end, minlen, 0, false);
|
|
div64_u64_rem(end, BITS_PER_BITMAP * ctl->unit, &rem);
|
|
/* If we ended in the middle of a bitmap, reset the trimming flag */
|
|
if (rem)
|
|
reset_trimming_bitmap(ctl, offset_to_bitmap(ctl, end));
|
|
out:
|
|
btrfs_unfreeze_block_group(block_group);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_trim_block_group_extents(struct btrfs_block_group *block_group,
|
|
u64 *trimmed, u64 start, u64 end, u64 minlen,
|
|
bool async)
|
|
{
|
|
int ret;
|
|
|
|
*trimmed = 0;
|
|
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->removed) {
|
|
spin_unlock(&block_group->lock);
|
|
return 0;
|
|
}
|
|
btrfs_freeze_block_group(block_group);
|
|
spin_unlock(&block_group->lock);
|
|
|
|
ret = trim_no_bitmap(block_group, trimmed, start, end, minlen, async);
|
|
btrfs_unfreeze_block_group(block_group);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_trim_block_group_bitmaps(struct btrfs_block_group *block_group,
|
|
u64 *trimmed, u64 start, u64 end, u64 minlen,
|
|
u64 maxlen, bool async)
|
|
{
|
|
int ret;
|
|
|
|
*trimmed = 0;
|
|
|
|
spin_lock(&block_group->lock);
|
|
if (block_group->removed) {
|
|
spin_unlock(&block_group->lock);
|
|
return 0;
|
|
}
|
|
btrfs_freeze_block_group(block_group);
|
|
spin_unlock(&block_group->lock);
|
|
|
|
ret = trim_bitmaps(block_group, trimmed, start, end, minlen, maxlen,
|
|
async);
|
|
|
|
btrfs_unfreeze_block_group(block_group);
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool btrfs_free_space_cache_v1_active(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return btrfs_super_cache_generation(fs_info->super_copy);
|
|
}
|
|
|
|
static int cleanup_free_space_cache_v1(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_trans_handle *trans)
|
|
{
|
|
struct btrfs_block_group *block_group;
|
|
struct rb_node *node;
|
|
int ret = 0;
|
|
|
|
btrfs_info(fs_info, "cleaning free space cache v1");
|
|
|
|
node = rb_first(&fs_info->block_group_cache_tree);
|
|
while (node) {
|
|
block_group = rb_entry(node, struct btrfs_block_group, cache_node);
|
|
ret = btrfs_remove_free_space_inode(trans, NULL, block_group);
|
|
if (ret)
|
|
goto out;
|
|
node = rb_next(node);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_set_free_space_cache_v1_active(struct btrfs_fs_info *fs_info, bool active)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
int ret;
|
|
|
|
/*
|
|
* update_super_roots will appropriately set or unset
|
|
* super_copy->cache_generation based on SPACE_CACHE and
|
|
* BTRFS_FS_CLEANUP_SPACE_CACHE_V1. For this reason, we need a
|
|
* transaction commit whether we are enabling space cache v1 and don't
|
|
* have any other work to do, or are disabling it and removing free
|
|
* space inodes.
|
|
*/
|
|
trans = btrfs_start_transaction(fs_info->tree_root, 0);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
|
|
if (!active) {
|
|
set_bit(BTRFS_FS_CLEANUP_SPACE_CACHE_V1, &fs_info->flags);
|
|
ret = cleanup_free_space_cache_v1(fs_info, trans);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
btrfs_end_transaction(trans);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = btrfs_commit_transaction(trans);
|
|
out:
|
|
clear_bit(BTRFS_FS_CLEANUP_SPACE_CACHE_V1, &fs_info->flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
/*
|
|
* Use this if you need to make a bitmap or extent entry specifically, it
|
|
* doesn't do any of the merging that add_free_space does, this acts a lot like
|
|
* how the free space cache loading stuff works, so you can get really weird
|
|
* configurations.
|
|
*/
|
|
int test_add_free_space_entry(struct btrfs_block_group *cache,
|
|
u64 offset, u64 bytes, bool bitmap)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = cache->free_space_ctl;
|
|
struct btrfs_free_space *info = NULL, *bitmap_info;
|
|
void *map = NULL;
|
|
enum btrfs_trim_state trim_state = BTRFS_TRIM_STATE_TRIMMED;
|
|
u64 bytes_added;
|
|
int ret;
|
|
|
|
again:
|
|
if (!info) {
|
|
info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!bitmap) {
|
|
spin_lock(&ctl->tree_lock);
|
|
info->offset = offset;
|
|
info->bytes = bytes;
|
|
info->max_extent_size = 0;
|
|
ret = link_free_space(ctl, info);
|
|
spin_unlock(&ctl->tree_lock);
|
|
if (ret)
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
return ret;
|
|
}
|
|
|
|
if (!map) {
|
|
map = kmem_cache_zalloc(btrfs_free_space_bitmap_cachep, GFP_NOFS);
|
|
if (!map) {
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
|
|
1, 0);
|
|
if (!bitmap_info) {
|
|
info->bitmap = map;
|
|
map = NULL;
|
|
add_new_bitmap(ctl, info, offset);
|
|
bitmap_info = info;
|
|
info = NULL;
|
|
}
|
|
|
|
bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes,
|
|
trim_state);
|
|
|
|
bytes -= bytes_added;
|
|
offset += bytes_added;
|
|
spin_unlock(&ctl->tree_lock);
|
|
|
|
if (bytes)
|
|
goto again;
|
|
|
|
if (info)
|
|
kmem_cache_free(btrfs_free_space_cachep, info);
|
|
if (map)
|
|
kmem_cache_free(btrfs_free_space_bitmap_cachep, map);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Checks to see if the given range is in the free space cache. This is really
|
|
* just used to check the absence of space, so if there is free space in the
|
|
* range at all we will return 1.
|
|
*/
|
|
int test_check_exists(struct btrfs_block_group *cache,
|
|
u64 offset, u64 bytes)
|
|
{
|
|
struct btrfs_free_space_ctl *ctl = cache->free_space_ctl;
|
|
struct btrfs_free_space *info;
|
|
int ret = 0;
|
|
|
|
spin_lock(&ctl->tree_lock);
|
|
info = tree_search_offset(ctl, offset, 0, 0);
|
|
if (!info) {
|
|
info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset),
|
|
1, 0);
|
|
if (!info)
|
|
goto out;
|
|
}
|
|
|
|
have_info:
|
|
if (info->bitmap) {
|
|
u64 bit_off, bit_bytes;
|
|
struct rb_node *n;
|
|
struct btrfs_free_space *tmp;
|
|
|
|
bit_off = offset;
|
|
bit_bytes = ctl->unit;
|
|
ret = search_bitmap(ctl, info, &bit_off, &bit_bytes, false);
|
|
if (!ret) {
|
|
if (bit_off == offset) {
|
|
ret = 1;
|
|
goto out;
|
|
} else if (bit_off > offset &&
|
|
offset + bytes > bit_off) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
n = rb_prev(&info->offset_index);
|
|
while (n) {
|
|
tmp = rb_entry(n, struct btrfs_free_space,
|
|
offset_index);
|
|
if (tmp->offset + tmp->bytes < offset)
|
|
break;
|
|
if (offset + bytes < tmp->offset) {
|
|
n = rb_prev(&tmp->offset_index);
|
|
continue;
|
|
}
|
|
info = tmp;
|
|
goto have_info;
|
|
}
|
|
|
|
n = rb_next(&info->offset_index);
|
|
while (n) {
|
|
tmp = rb_entry(n, struct btrfs_free_space,
|
|
offset_index);
|
|
if (offset + bytes < tmp->offset)
|
|
break;
|
|
if (tmp->offset + tmp->bytes < offset) {
|
|
n = rb_next(&tmp->offset_index);
|
|
continue;
|
|
}
|
|
info = tmp;
|
|
goto have_info;
|
|
}
|
|
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (info->offset == offset) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (offset > info->offset && offset < info->offset + info->bytes)
|
|
ret = 1;
|
|
out:
|
|
spin_unlock(&ctl->tree_lock);
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */
|