[Xen-changelog] [xen-unstable] blktap: Add one more error reason statement to blktapctrl

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1180000207 -3600
# Node ID 12a12637af464e031c2f08cbf5825e387e899f78
# Parent  03c213fd2360e2b5e825108140dd4bc8b0b6936f
blktap:  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@xxxxxxxxxxxxxxxxxx>
---
 tools/blktap/drivers/blktapctrl.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff -r 03c213fd2360 -r 12a12637af46 tools/blktap/drivers/blktapctrl.c
--- a/tools/blktap/drivers/blktapctrl.c Thu May 24 10:48:58 2007 +0100
+++ b/tools/blktap/drivers/blktapctrl.c Thu May 24 10:50:07 2007 +0100
@@ -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);

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