JFS: don't dereference tlck->ip from txUpdateMap

The inode pointer may no longer be valid

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

2 files changed, 9 insertions, 1 deletions

diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
index 8132fce80993..9b71ed2674fe 100644
--- a/fs/jfs/jfs_txnmgr.c
+++ b/fs/jfs/jfs_txnmgr.c
@@ -725,6 +725,9 @@ struct tlock *txLock(tid_t tid, struct inode *ip, struct metapage * mp,
         else
                 tlck->flag = tlckINODELOCK;
 
+        if (S_ISDIR(ip->i_mode))
+                tlck->flag |= tlckDIRECTORY;
+
         tlck->type = 0;
 
         /* bind the tlock and the page */
@@ -1009,6 +1012,8 @@ struct tlock *txMaplock(tid_t tid, struct inode *ip, int type)
 
         /* bind the tlock and the object */
         tlck->flag = tlckINODELOCK;
+        if (S_ISDIR(ip->i_mode))
+                tlck->flag |= tlckDIRECTORY;
         tlck->ip = ip;
         tlck->mp = NULL;
 
@@ -1077,6 +1082,8 @@ struct linelock *txLinelock(struct linelock * tlock)
         linelock->flag = tlckLINELOCK;
         linelock->maxcnt = TLOCKLONG;
         linelock->index = 0;
+        if (tlck->flag & tlckDIRECTORY)
+                linelock->flag |= tlckDIRECTORY;
 
         /* append linelock after tlock */
         linelock->next = tlock->next;
@@ -2358,7 +2365,7 @@ static void txUpdateMap(struct tblock * tblk)
                          */
                         else {  /* (maplock->flag & mlckFREE) */
 
-                                if (S_ISDIR(tlck->ip->i_mode))
+                                if (tlck->flag & tlckDIRECTORY)
                                         txFreeMap(ipimap, maplock,
                                                   tblk, COMMIT_PWMAP);
                                 else
diff --git a/fs/jfs/jfs_txnmgr.h b/fs/jfs/jfs_txnmgr.h
index 59ad0f6b7231..0e4dc4514c47 100644
--- a/fs/jfs/jfs_txnmgr.h
+++ b/fs/jfs/jfs_txnmgr.h
@@ -122,6 +122,7 @@ extern struct tlock *TxLock;	/* transaction lock table */
 #define tlckLOG                 0x0800
 /* updateMap state */
 #define tlckUPDATEMAP           0x0080
+#define tlckDIRECTORY           0x0040
 /* freeLock state */
 #define tlckFREELOCK            0x0008
 #define tlckWRITEPAGE           0x0004