xfs: xfs_quiesce_attr() should quiesce the log like unmount
xfs_quiesce_attr() is supposed to leave the log empty with an unmount record written. Right now it does not wait for the AIL to be emptied before writing the unmount record, not does it wait for metadata IO completion, either. Fix it to use the same method and code as xfs_log_unmount(). Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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