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Btrfs: compression must free at least one sector size

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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>
This commit is contained in:
Timofey Titovets 2017-06-06 14:41:15 +03:00 committed by David Sterba
parent c5e4c3d750
commit 170607ebd9
1 changed files with 3 additions and 4 deletions
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7
fs/btrfs/inode.c
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@ -607,12 +607,11 @@ static noinline void compress_file_range(struct inode *inode,
/*
* 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;