diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 799d3837e7c2..46b060756208 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -745,9 +745,13 @@ int diWrite(tid_t tid, struct inode *ip)
 		p = (dtpage_t *) &jfs_ip->i_dtroot;
 		xp = (dtpage_t *) & dp->di_dtroot;
 		lv = ilinelock->lv;
-		for (n = 0; n < ilinelock->index; n++, lv++) {
-			memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
-			       lv->length << L2DTSLOTSIZE);
+		if (lv->offset < 128) {
+			for (n = 0; n < ilinelock->index; n++, lv++) {
+				memcpy(&xp->slot[lv->offset], &p->slot[lv->offset],
+					lv->length << L2DTSLOTSIZE);
+			}
+		} else {
+			jfs_err("diWrite: inode too large");	
 		}
 	} else {
 		jfs_err("diWrite: UFO tlock");