Hi!
This is a somewhat generic subject, so please forgive me. We are having some
very strange Xen problem in SLES11 SP3 (kernel 3.0.101-0.46-xen).
Eventually I found out that the message
kernel: [615432.648108] vbd vbd-7-51888: 2 creating vbd structure
is not a "progress" message (some vbd structure was created), but an error
message (the vbd structure was NOT created because of error "2").
So first the user has to recognize that the text actually is an error, then the
user has to find out what "2" means. Interestingly the most important
information is missing (block major an minor number of the device for
vbd_create()). When I did a little digging in the code I found this pearl of
code (/usr/src/linux/drivers/xen/blkback/xenbus.c):
switch (err) {
case -ENOMEDIUM:
if (!(be->blkif->vbd.type & (VDISK_CDROM | VDISK_REMOVABLE))) {
default:
xenbus_dev_fatal(dev, err, "creating vbd structure");
break;
}
/* fall through */
case 0:
err = xenvbd_sysfs_addif(dev);
if (err) {
vbd_free(&be->blkif->vbd);
xenbus_dev_fatal(dev, err, "creating sysfs entries");
}
break;
}
Itself vbd_create() does not log a message, and neither does
blkdev_get_by_dev() where the error comes from.
Regards,
Ulrich
P.S. Not subscribed to LKML, so please keep me on CC: to address me
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