CXD-99-blkback-gnterr-status.diff

diff -r 7586d89f9254 drivers/xen/blkback/blkback.c
--- a/drivers/xen/blkback/blkback.c	Tue Sep 08 15:21:57 2009 -0700
+++ b/drivers/xen/blkback/blkback.c	Tue Sep 08 15:23:01 2009 -0700
@@ -557,7 +557,8 @@
 
 	for (i = 0; i < nseg; i++) {
 		if (unlikely(map[i].status != 0)) {
-			DPRINTK("invalid buffer -- could not remap it\n");
+			DPRINTK("grant map of dom %u gref %u failed: status %d\n",
+				blkif->domid, req->seg[i].gref, map[i].status);
 			map[i].handle = BLKBACK_INVALID_HANDLE;
 			ret |= 1;
 			continue;