xfs: shutdown xfs_sync_worker before the log
Revert commit 1307bbd2, which uses the s_umount semaphore to provide exclusion between xfs_sync_worker and unmount, in favor of shutting down the sync worker before freeing the log in xfs_log_unmount. This is a cleaner way of resolving the race between xfs_sync_worker and unmount than using s_umount. Signed-off-by: Ben Myers <bpm@sgi.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
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