xfs: don't allocate COW blocks for zeroing holes or unwritten extents

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The iomap zeroing interface is smart enough to skip zeroing holes or
unwritten extents.  Don't subvert this logic for reflink files.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Christoph Hellwig 2018-03-01 14:10:31 -08:00 • committed by Darrick J. Wong

parent 5b4c845ea4

commit 172ed391f6

1 changed files with 10 additions and 1 deletions

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fs/xfs/xfs_iomap.c

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