lkml.org 
[lkml]   [2006]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC PATCH 35/35] Add Xen virtual block device driver.
  Hi,

>> +static struct xlbd_type_info xlbd_ide_type = {
>> +static struct xlbd_type_info xlbd_scsi_type = {
>> +static struct xlbd_type_info xlbd_vbd_type = {

> This is another thing that has always put me off. The virtual block
> device driver has the ability to masquerade as other types of block
> devices. It actually claims to be an IDE or SCSI device allocating the
> appropriate major/minor numbers.

It's useful sometimes. Debian/sarge for example doesn't work with xvd
block devices. At least not out-of-the-box, it needs some manual
tweaks. Probably it also is handy when moving real machines into an
virtual environment. I don't think it should be dropped.

Most modern udev-based distros work just fine with xvd though.

> This seems to be pretty evil and creating interesting failure conditions
> for users who load IDE or SCSI modules. I've seen it trip up a number
> of people in the past. I think we should only ever use the major number
> that was actually allocated to us.

Print a big fat warning? And also change the example config files in
the xen source tree to use xvda not hda to advertize them more than we
do right now. I think lots of users don't even know about the xvd
devices ...

cheers,

Gerd

--
Gerd 'just married' Hoffmann <kraxel@suse.de>
I'm the hacker formerly known as Gerd Knorr.
http://www.suse.de/~kraxel/just-married.jpeg
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-03-27 10:43    [W:0.331 / U:0.516 seconds]
©2003-2014 Jasper Spaans. Advertise on this site