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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: Ansgar Lößer <ansgar.loesser@kom.tu-darmstadt.de>
Reported-by: Max Schlecht <max.schlecht@informatik.hu-berlin.de>
Reported-by: Björn Scheuermann <scheuermann@kom.tu-darmstadt.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Darrick J Wong <djwong@kernel.org>
Signed-off-by: Ansgar Lößer <ansgar.loesser@kom.tu-darmstadt.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ansgar Lößer 2022-07-13 20:51:44 +02:00 committed by Linus Torvalds
parent d0b97f3891
commit 4a57a84000
1 changed files with 1 additions and 1 deletions
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2
fs/remap_range.c
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@ -547,7 +547,7 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
else if (deduped < 0)
info->status = deduped;
else
info->bytes_deduped = len;
info->bytes_deduped = deduped;
next_fdput:
fdput(dst_fd);