Btrfs: protect conditions within root->log_mutex while waiting
Both wait_for_commit() and wait_for_writer() are checking the condition out of the mutex lock. This refactors code a bit to be lock safe. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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