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xfs: always succeed when deduping zero bytes 

It turns out that btrfs and xfs had differing interpretations of what
to do when the dedupe length is zero.  Change xfs to follow btrfs'
semantics so that the userland interface is consistent.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-11-28 14:57:42 +11:00 committed by Dave Chinner
parent cf7841c12d
commit fba3e594ef
1 changed files with 7 additions and 1 deletions
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8
fs/xfs/xfs_reflink.c
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@ -1317,8 +1317,14 @@ xfs_reflink_remap_range(
goto out_unlock;
}
if (len == 0)
/* Zero length dedupe exits immediately; reflink goes to EOF. */
if (len == 0) {
if (is_dedupe) {
ret = 0;
goto out_unlock;
}
len = isize - pos_in;
}
/* Ensure offsets don't wrap and the input is inside i_size */
if (pos_in + len < pos_in || pos_out + len < pos_out ||