diff -aurp linux-2.6.3-orig/drivers/block/ll_rw_blk.c linux-2.6.3-ec/drivers/block/ll_rw_blk.c
--- linux-2.6.3-orig/drivers/block/ll_rw_blk.c	2004-02-17 19:57:16.000000000 -0800
+++ linux-2.6.3-ec/drivers/block/ll_rw_blk.c	2004-02-18 12:33:50.000000000 -0800
@@ -2456,8 +2456,13 @@ static int __end_that_request_first(stru
 	if (!blk_pc_request(req))
 		req->errors = 0;
 
-	if (!uptodate) {
-		error = -EIO;
+	/*
+	 * Most drivers set uptodate to 0 for error and 1 for success.
+	 * MD/DM ready drivers will set 1 for success and a -Exxx
+	 * value to indicate a specific error.
+	 */
+	if (uptodate < 1) {
+		error = (uptodate == 0 ? -EIO : uptodate);
 		if (blk_fs_request(req) && !(req->flags & REQ_QUIET))
 			printk("end_request: I/O error, dev %s, sector %llu\n",
 				req->rq_disk ? req->rq_disk->disk_name : "?",
@@ -2540,7 +2545,7 @@ static int __end_that_request_first(stru
 /**
  * end_that_request_first - end I/O on a request
  * @req:      the request being processed
- * @uptodate: 0 for I/O error
+ * @@uptodate: <= 0 to indicate an I/O error.
  * @nr_sectors: number of sectors to end I/O on
  *
  * Description:
@@ -2561,7 +2566,7 @@ EXPORT_SYMBOL(end_that_request_first);
 /**
  * end_that_request_chunk - end I/O on a request
  * @req:      the request being processed
- * @uptodate: 0 for I/O error
+ * @uptodate: <= 0 to indicate an I/O error.
  * @nr_bytes: number of bytes to complete
  *
  * Description:
diff -aurp linux-2.6.3-orig/include/linux/errno.h linux-2.6.3-ec/include/linux/errno.h
--- linux-2.6.3-orig/include/linux/errno.h	2004-02-17 19:59:12.000000000 -0800
+++ linux-2.6.3-ec/include/linux/errno.h	2004-02-18 12:45:42.000000000 -0800
@@ -23,6 +23,14 @@
 #define EJUKEBOX	528	/* Request initiated, but will not complete before timeout */
 #define EIOCBQUEUED	529	/* iocb queued, will get completion event */
 
+/* Block device error codes */
+#define EFATALDEV	540	/* Fatal device error */
+#define EFATALTRNSPT	541	/* Fatal transport error */
+#define EFATALDRV	542	/* Fatal driver error */
+#define ERETRYDEV	543	/* Device error occured, I/O may be retried */
+#define ERETRYTRNSPT	544	/* Transport error occured, I/O may be retried */
+#define ERETRYDRV	545	/* Driver error occured, I/O may be retried */
+
 #endif
 
 #endif