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authorLiu Bo <liubo2009@cn.fujitsu.com>2012-02-09 18:17:41 +0800
committerDavid Sterba <dsterba@suse.cz>2012-02-15 16:40:23 +0100
commit2cac13e41bf5b99ffc426bd28dfd2248df1dfa67 (patch)
treeb74e7e863b7d7c2e116dc6754d8faf701c0aa3c9 /fs
parent6af021d8fc3bcce790e7fbb391e39c5920fa3f71 (diff)
Btrfs: fix trim 0 bytes after a device delete
A user reported a bug of btrfs's trim, that is we will trim 0 bytes after a device delete. The reproducer: $ mkfs.btrfs disk1 $ mkfs.btrfs disk2 $ mount disk1 /mnt $ fstrim -v /mnt $ btrfs device add disk2 /mnt $ btrfs device del disk1 /mnt $ fstrim -v /mnt This is because after we delete the device, the block group may start from a non-zero place, which will confuse trim to discard nothing. Reported-by: Lutz Euler <lutz.euler@freenet.de> Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent-tree.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 283af7a676a3..60bfe2d68547 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7886,9 +7886,16 @@ int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range)
u64 start;
u64 end;
u64 trimmed = 0;
+ u64 total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
int ret = 0;
- cache = btrfs_lookup_block_group(fs_info, range->start);
+ /*
+ * try to trim all FS space, our block group may start from non-zero.
+ */
+ if (range->len == total_bytes)
+ cache = btrfs_lookup_first_block_group(fs_info, range->start);
+ else
+ cache = btrfs_lookup_block_group(fs_info, range->start);
while (cache) {
if (cache->key.objectid >= (range->start + range->len)) {