JFS: Fix race in txLock

TxAnchor.anon_list is protected by jfsTxnLock (TXN_LOCK), but there was
a place in txLock() that was removing an entry from the list without holding
the spinlock.

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 3555acff12d0..c7a92f9deb2b 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -657,7 +657,9 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
                                 /* only anonymous txn.
                                  * Remove from anon_list
                                  */
+                                TXN_LOCK();
                                 list_del_init(&jfs_ip->anon_inode_list);
+                                TXN_UNLOCK();
                         }
                         jfs_ip->atlhead = tlck->next;
                 } else {