JFS: [4 of 6] Add debug code to help catch elusive bug

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
#	           ChangeSet	1.967   -> 1.967.4.1
#	   fs/jfs/jfs_dmap.c	1.6     -> 1.7    
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/02/12	[email protected]	1.967.4.1
# JFS: Add debug code to help catch elusive bug
# --------------------------------------------
#
diff -Nru a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
--- a/fs/jfs/jfs_dmap.c	Wed Feb 26 11:11:02 2003
+++ b/fs/jfs/jfs_dmap.c	Wed Feb 26 11:11:02 2003
@@ -22,6 +22,7 @@
 #include "jfs_imap.h"
 #include "jfs_lock.h"
 #include "jfs_metapage.h"
+#include "jfs_superblock.h"
 #include "jfs_debug.h"
 
 /*
@@ -381,7 +382,22 @@
 	IREAD_LOCK(ipbmap);
 
 	/* block to be freed better be within the mapsize. */
-	assert(blkno + nblocks <= bmp->db_mapsize);
+	if (unlikely(blkno + nblocks > bmp->db_mapsize)) {
+		/*
+		 * Trying to catch a bug here
+		 */
+		printk(KERN_ERR
+		       "JFS: dbFree asked to free block larger than mapsize\n");
+		printk(KERN_ERR
+		       "blkno = 0x%Lx, nblocks = 0x%Lx, mapsize = 0x%Lx\n",
+		       blkno, nblocks, bmp->db_mapsize);
+		printk(KERN_ERR "ino = %ld, cflag = %lx\n", ip->i_ino,
+		       JFS_IP(ip)->cflag);
+		dump_stack();
+		/* Make sure fsck fixes things back up */
+		updateSuper(ip->i_sb, FM_DIRTY);
+		return -EIO;	/* Nobody checks the return code */
+	}
 
 	/*
 	 * free the blocks a dmap at a time.