iomap: rework unshare flag
Instead of another internal flags namespace inside of buffered-io.c, just pass a UNSHARE hint in the main iomap flags field. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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