From: Qu Wenruo wqu@suse.com
commit 2d974619a77f106f3d1341686dea95c0eaad601f upstream.
The old code goes:
offset = logical - em->start; length = min_t(u64, em->len - offset, length);
Where @length calculation is dependent on offset, it can take reader several more seconds to find it's just the same code as:
offset = logical - em->start; length = min_t(u64, em->start + em->len - logical, length);
Use above code to make the length calculate independent from other variable, thus slightly increase the readability.
Reviewed-by: Johannes Thumshirn jthumshirn@suse.de Reviewed-by: Josef Bacik josef@toxicpanda.com Signed-off-by: Qu Wenruo wqu@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Anand Jain anand.jain@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/btrfs/volumes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -5714,7 +5714,7 @@ static int __btrfs_map_block_for_discard }
offset = logical - em->start; - length = min_t(u64, em->len - offset, length); + length = min_t(u64, em->start + em->len - logical, length);
stripe_len = map->stripe_len; /*