2.4.27-pre6

 fs

 jfs

diff -Naur -p -X /home/marcelo/lib/dontdiff linux-2.4.26/fs/jfs/jfs_dmap.c linux-2.4.27-pre6/fs/jfs/jfs_dmap.c
--- linux-2.4.26/fs/jfs/jfs_dmap.c   2004-04-14 13:05:40.000000000 +0000
+++ linux-2.4.27-pre6/fs/jfs/jfs_dmap.c   2004-06-16 17:35:34.000000000 +0000
@@ -1,5 +1,5 @@
 /*
- *   Copyright (C) International Business Machines Corp., 2000-2003
+ *   Copyright (C) International Business Machines Corp., 2000-2004
  *
  *   This program is free software;  you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -382,7 +382,7 @@ int dbFree(struct inode *ip, s64 blkno, 
    IREAD_LOCK(ipbmap);
 
    /* block to be freed better be within the mapsize. */
-   if (unlikely(blkno + nblocks > bmp->db_mapsize)) {
+   if (unlikely((blkno == 0) || (blkno + nblocks > bmp->db_mapsize))) {
       IREAD_UNLOCK(ipbmap);
       printk(KERN_ERR "blkno = %Lx, nblocks = %Lx\n",
              (unsigned long long) blkno,