Re: disk/by-label + label-change

[Kay Sievers <kay.sievers@vrfy.org>]

On Tue, 2006-12-12 at 17:51 +0000, T. Horsnell wrote:
> >On 12/12/06, T. Horsnell <tsh@mrc-lmb.cam.ac.uk> wrote:
> >> If a disk with a persistence-entry in /dev/disk/by-label
> >> is re-labelled with tune2fs, the by-label entry isnt
> >> updated to match the new label and when the disk is mounted
> >> with a 'mount -L ',
> >
> >You are writing to a raw sector of the disk, no part of the system
> >will notice that you did this and have changed something. You need to
> >tell the kernel to emit an event by doing:
> >  echo "add" > /sys/block/sda/uevent
> >and the link will get updated.
> 
> OK, thanks. But shouldnt tune2fs do this when it updates the label?
> I guess I should make my own tune2fs script and do it there.

Right, that shouldn't be part of the tool that writes to the disk, it
can't know if it's safe to update the links.

> >> the mounted-device shows up as something
> >> like:
> >>
> >> [root@dev1 ~]# mount
> >> /dev/hdb2 on / type ext3 (rw)
> >> proc on /proc type proc (rw)
> >> sysfs on /sys type sysfs (rw)
> >> devpts on /dev/pts type devpts (rw,gid=5,modeb0)
> >> tmpfs on /dev/shm type tmpfs (rw)
> >> none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
> >> sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> >> >>>> /dev/.tmp-8-17 on /test type ext3 (rw)
> >>
> >> Is this as it should be?
> >
> >Looks like you mounted the device with a PROGRAM rule, right? This is
> >definitely not what it "should be". :)
> 
> I do no mounting in udev, its all in fstab. I never thought to
> do it in a udev PROGRAM rule...

But who is using udev's temporary device node for mount then?
  /dev/.tmp-8-17 on /test type ext3 (rw)

That usually only exists during the udev event processing.

Kay


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