xfs: do not write the buffer from xfs_iflush
Instead of writing the buffer directly from inside xfs_iflush return it to the caller and let the caller decide what to do with the buffer. Also remove the pincount check in xfs_iflush that all non-blocking callers already implement and the now unused flags parameter. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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