xfs: improve the IOMAP_NOWAIT check for COW inodes
Only bail out once we know that a COW allocation is actually required, similar to how we handle normal data fork allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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