RE: [Xen-devel] can't mount root... devfs???

[James H. <Ja...@be...>]

devfs is alive and well in 2.6. there is a udev(?) scheme i think which acc=
omplishes the same sort of thing via a different mechanism, but that is abo=
ut the extent of my knowledge on it and is probably wrong anyway!!!

it is the kernel failing to mount /dev/sda7, not userspace. It also fails i=
f I specify root as 0807, so I guess it isn't a devfs issue on dom1. Dom0 a=
lso is using devfs, /dev/sda7 is a symlink to /dev/scsi/host0/bus0/target5/=
lun0/part7, which is in turn of the right major and minor number. Would xen=
 be failing to work out the device numbers because of the symlink?

After my next reboot i'll try making /dev/sda7 a proper device node. After =
dom1 crashes and burns, I don't seem to be able to kill it (xm destroy 1), =
or create it again, so I have to reboot. doh.

Also, make menuconfig for xenU flashes an error on the screen but otherwise=
 works unless I try to look in SCSI where I get this message:

Menuconfig has encountered a possible error in one of the kernel's
configuration files and is unable to continue.  Here is the error
report:
 Q> scripts/Menuconfig: line 832: MCmenu53: command not found
Please report this to the maintainer <me...@sh...>.  You may also
send a problem report to <lin...@vg...>.
Please indicate the kernel version you are trying to configure and
which menu you were trying to enter when this error occurred.

James





From: Keir Fraser
Sent: Wed 30/06/2004 4:43 PM
To: James Harper
Cc: xen...@li...
Subject: Re: [Xen-devel] can't mount root... devfs???


> Domain1 is now not booting anymore, and the boot console tells me it's be=
cause it can't mount /dev/sda7.
>=20
> My config files says sda7 maps to /dev/sda7 eg:
>=20
> disk =3D [ 'phy:sda7,sda7,w' ]
> root =3D "/dev/sda7 ro"
>=20
> My only thought is that maybe devfs is confusing the issue... eg there ar=
e no scsi devices so sda7 doesn't appear in /dev.
>=20
> Can anyone confirm/deny this?

We make no effort to make 'logical' devices appear in devfs --- if
it doesn't happen automatically then code needs to be added to do it
manually.

Is devfs still alive in 2.6, or have they moved to some other scheme?

 -- Keir