xfs: introduce xfs_mod_frextents
Add a new helper to modify the incore counter of free realtime extents. This matches the helpers used for inode and data block counters, and removes a significant users of the xfs_mod_incore_sb() interface. Based on a patch originally from Christoph Hellwig. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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