Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/buffer.c

@@ -1111,6 +1111,20 @@ __getblk_slow(struct block_device *bdev, sector_t block, int size)
 		return NULL;
 	}
 
+#if (BITS_PER_LONG == 32) && defined(CONFIG_LBD)
+	if ((block >> (PAGE_CACHE_SHIFT - bdev->bd_inode->i_blkbits)) &
+			0xffffffff00000000UL) {
+		/*
+		 * We'll fail because the block is outside the range
+		 * which a 32-bit pagecache index can address
+		 */
+		printk(KERN_ERR "getblk(): sector number too large for 32-bit"
+				"machines\n");
+		dump_stack();
+		return NULL;
+	}
+#endif
+
 	for (;;) {
 		struct buffer_head * bh;
 		int ret;