xfs: support returning partial reflink results

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Back when the XFS reflink code only supported clone_file_range, we were
only able to return zero or negative error codes to userspace.  However,
now that copy_file_range (which returns bytes copied) can use XFS'
clone_file_range, we have the opportunity to return partial results.
For example, if userspace sends a 1GB clone request and we run out of
space halfway through, we at least can tell userspace that we completed
512M of that request like a regular write.

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>

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Darrick J. Wong 2018-10-30 10:47:06 +11:00 • committed by Dave Chinner

parent 9f04aaffdd

commit 3f68c1f562

3 changed files with 14 additions and 10 deletions

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5

fs/xfs/xfs_file.c

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17

fs/xfs/xfs_reflink.c

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2

fs/xfs/xfs_reflink.h

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