Commit 4a57a840 authored by Ansgar Lößer's avatar Ansgar Lößer Committed by Linus Torvalds
Browse files

vf/remap: return the amount of bytes actually deduplicated 

When using the FIDEDUPRANGE ioctl, in case of success the requested size
is returned. In some cases this might not be the actual amount of bytes
deduplicated.

This change modifies vfs_dedupe_file_range() to report the actual amount
of bytes deduplicated, instead of the requested amount.

Link: https://lore.kernel.org/linux-fsdevel/5548ef63-62f9-4f46-5793-03165ceccacc@tu-darmstadt.de/


Reported-by: default avatarAnsgar Lößer <ansgar.loesser@kom.tu-darmstadt.de>
Reported-by: default avatarMax Schlecht <max.schlecht@informatik.hu-berlin.de>
Reported-by: default avatarBjörn Scheuermann <scheuermann@kom.tu-darmstadt.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Darrick J Wong <djwong@kernel.org>
Signed-off-by: default avatarAnsgar Lößer <ansgar.loesser@kom.tu-darmstadt.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d0b97f38

fs/remap_range.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -547,7 +547,7 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same) 
		else if (deduped < 0)

		else if (deduped < 0)

			info->status = deduped;

			info->status = deduped;

		else

		else

			info->bytes_deduped = len;

			info->bytes_deduped = deduped;





next_fdput:

next_fdput:

		fdput(dst_fd);

		fdput(dst_fd);