[PATCH] Fix race in JFS

From Christoph Hellwig

http://oss.software.ibm.com/pipermail/jfs-patches/2002-March/000045.html

fs/jfs/jfs_txnmgr.c

@@ -2778,6 +2778,7 @@ int jfs_lazycommit(void)
 	complete(&jfsIOwait);
 
 	do {
+		LAZY_LOCK(flags);
 restart:
 		WorkDone = 0;
 		while ((tblk = TxAnchor.unlock_queue)) {
@@ -2789,7 +2790,6 @@ int jfs_lazycommit(void)
 			 */
 			WorkDone = 1;
 
-			LAZY_LOCK(flags);
 			/*
 			 * Remove first transaction from queue
 			 */
@@ -2809,11 +2809,13 @@ int jfs_lazycommit(void)
 				current->state = TASK_RUNNING;
 				schedule();
 			}
+			LAZY_LOCK(flags);
 		}
 
 		if (WorkDone)
 			goto restart;
 
+		LAZY_UNLOCK(flags);
 		set_current_state(TASK_INTERRUPTIBLE);
 		schedule();
 	} while (!jfs_thread_stopped());