# HG changeset patch
# User Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
# Date 1179814369 -7200
# Node ID 6d25bbfcb3e2ce7660b5253431b0b9638d1df1bc
# Parent  be31124bbec216693cb5758ee2e6d87b3fd292b2
[XEN][TOOLS][PATCH] Add one more error reason statement to blktapctrl
blktapctrl already prints out exits reasons for all goto's to open_failed except of not finding a device number for blktap0
This patch adds just that message so the user will get more info than just "Unable to start blktapctrl"
Common source of this issue is that blktap is missing/failed to load/...
Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

diff -r be31124bbec2 -r 6d25bbfcb3e2 tools/blktap/drivers/blktapctrl.c
--- a/tools/blktap/drivers/blktapctrl.c	Mon May 07 05:44:46 2007 +0200
+++ b/tools/blktap/drivers/blktapctrl.c	Tue May 22 08:12:49 2007 +0200
@@ -690,8 +690,10 @@ int main(int argc, char *argv[])
 
 	/* Attach to blktap0 */
 	asprintf(&devname,"%s/%s0", BLKTAP_DEV_DIR, BLKTAP_DEV_NAME);
-	if ((ret = xc_find_device_number("blktap0")) < 0)
+	if ((ret = xc_find_device_number("blktap0")) < 0) {
+		DPRINTF("couldn't find device number for 'blktap0'\n");
 		goto open_failed;
+    }
 	blktap_major = major(ret);
 	make_blktap_dev(devname,blktap_major,0);
 	ctlfd = open(devname, O_RDWR);