xfs: add rmap btree growfs support
Originally-From: Dave Chinner <dchinner@redhat.com> Now we can read and write rmap btree blocks, we can add support to the growfs code to initialise new rmap btree blocks. [darrick.wong@oracle.com: fill out the rmap offset fields] Signed-off-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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