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| author | Timofey Titovets <nefelim4ag@gmail.com> | 2017-06-06 14:41:15 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-06-19 18:26:04 +0200 |
| commit | 170607ebd9c891d6765445434460065b2e73ca51 (patch) | |
| tree | 60ecb74a023eb3fc8cf5b4d1bb7f4062fb009941 /fs/btrfs/inode.c | |
| parent | c5e4c3d7503453832444475641988ffa02b88b6d (diff) | |
| download | linux-rpi-170607ebd9c891d6765445434460065b2e73ca51.tar.gz linux-rpi-170607ebd9c891d6765445434460065b2e73ca51.tar.bz2 linux-rpi-170607ebd9c891d6765445434460065b2e73ca51.zip | |
Btrfs: compression must free at least one sector size
We already skip storing data where compression does not make the result
at least one byte less. Let's make the logic better and check
that compression frees at least one sector size of bytes, otherwise it's
not that useful.
Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ changelog updated ]
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/inode.c')
| -rw-r--r-- | fs/btrfs/inode.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index b74a6d23a0fe..a21a984d84d9 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -607,12 +607,11 @@ cont: /* * one last check to make sure the compression is really a - * win, compare the page count read with the blocks on disk + * win, compare the page count read with the blocks on disk, + * compression must free at least one sector size */ total_in = ALIGN(total_in, PAGE_SIZE); - if (total_compressed >= total_in) { - will_compress = 0; - } else { + if (total_compressed + blocksize <= total_in) { num_bytes = total_in; *num_added += 1; |