--- fs/block_dev.c.vanilla	Sat Dec  8 22:46:15 2001
+++ fs/block_dev.c	Sat Dec  8 23:30:53 2001
@@ -115,7 +115,28 @@
 
 static int blkdev_direct_IO(int rw, struct inode * inode, struct kiobuf * iobuf, unsigned long blocknr, int blocksize)
 {
-	return generic_direct_IO(rw, inode, iobuf, blocknr, blocksize, blkdev_get_block);
+	int i, nr_blocks, retval, dev = inode->i_rdev;
+	unsigned long * blocks = iobuf->blocks;
+
+	if (blocksize != BUFFERED_BLOCKSIZE)
+		BUG();
+
+	nr_blocks = iobuf->length >> BUFFERED_BLOCKSIZE_BITS;
+	/* build the blocklist */
+	for (i = 0; i < nr_blocks; i++, blocknr++) {
+		struct buffer_head bh;
+
+		retval = blkdev_get_block(inode, blocknr, &bh, 0);
+		if (retval)
+			goto out;
+
+			blocks[i] = bh.b_blocknr;
+	}
+
+	retval = brw_kiovec(rw, 1, &iobuf, dev, iobuf->blocks, blocksize);
+
+ out:
+	return retval;
 }
 
 static int blkdev_writepage(struct page * page)
--- include/linux/fs.h.vanilla	Sat Dec  8 23:08:37 2001
+++ include/linux/fs.h	Sat Dec  8 23:08:02 2001
@@ -46,6 +46,10 @@
 #define BLOCK_SIZE_BITS 10
 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
 
+/* buffer header fixed size for the blkdev I/O through pagecache */
+#define BUFFERED_BLOCKSIZE_BITS 10
+#define BUFFERED_BLOCKSIZE (1 << BUFFERED_BLOCKSIZE_BITS)
+
 /* And dynamically-tunable limits and defaults: */
 struct files_stat_struct {
 	int nr_files;		/* read only */