xfs: turn ic_state into an enum
ic_state really is a set of different states, even if the values are encoded as non-conflicting bits and we sometimes use logical and operations to check for them. Switch all comparisms to check for exact values (and use switch statements in a few places to make it more clear) and turn the values into an implicitly enumerated enum type. 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> Reviewed-by: Brian Foster <bfoster@redhat.com>
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