xfs: support a union-based filter for eofblocks scans
From: Brian Foster <bfoster@redhat.com> The eofblocks scan inode filter uses intersection logic by default. E.g., specifying both user and group quota ids filters out inodes that are not covered by both the specified user and group quotas. This is suitable for behavior exposed to userspace. Scans that are initiated from within the kernel might require more broad semantics, such as scanning all inodes under each quota associated with an inode to alleviate low free space conditions in each. Create the XFS_EOF_FLAGS_UNION flag to support a conditional union-based filtering algorithm for eofblocks scans. This flag is intentionally left out of the valid mask as it is not supported for scans initiated from userspace. Signed-off-by: NBrian Foster <bfoster@redhat.com> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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