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| author | Li Zefan <lizf@cn.fujitsu.com> | 2011-11-20 07:33:38 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-11-20 07:42:14 -0500 |
| commit | 0f0fbf1d0e188d129756e9508090af4bdbfde00b (patch) | |
| tree | 1c015e7be1e1ede9b2b654cb6264217fc110e598 /fs/btrfs | |
| parent | 32240a913d9f3a5aad42175d7696590ea1bfdb08 (diff) | |
| download | lwn-0f0fbf1d0e188d129756e9508090af4bdbfde00b.tar.gz lwn-0f0fbf1d0e188d129756e9508090af4bdbfde00b.zip | |
Btrfs: fix to search one more bitmap for cluster setup
Suppose there are two bitmaps [0, 256], [256, 512] and one extent
[100, 120] in the free space cache, and we want to setup a cluster
with offset=100, bytes=50.
In this case, there will be only one bitmap [256, 512] in the temporary
bitmaps list, and then setup_cluster_bitmap() won't search bitmap [0, 256].
The cause is, the list is constructed in setup_cluster_no_bitmap(),
and only bitmaps with bitmap_entry->offset >= offset will be added
into the list, and the very bitmap that convers offset has
bitmap_entry->offset <= offset.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/free-space-cache.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 181760f9d2ab..8f792f41feab 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -2453,11 +2453,23 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, struct btrfs_free_space *entry; struct rb_node *node; 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. + */ + entry = list_first_entry(bitmaps, struct btrfs_free_space, list); + if (entry->offset != bitmap_offset) { + entry = tree_search_offset(ctl, bitmap_offset, 1, 0); + if (entry && list_empty(&entry->list)) + list_add(&entry->list, bitmaps); + } + + /* * First check our cached list of bitmaps and see if there is an entry * here that will work. */ |