[Pkg-sysvinit-devel] Unexpected problem with /etc/mtab -> /proc/mounts

[Henrique de Moraes Holschuh]

Hi Thomas!

On Sat, 21 Jan 2006, Thomas Hood wrote:

> Miquel van Smoorenburg wrote:
> > Ehm, I haven't been following the development due to a chronic lack of
> > time, but using /proc/mounts instead of /etc/mtab when umounting
> > probably breaks loopback mounts.
> 
> 
> I haven't tested unmounting it but loopback mounts do appear in /proc/mounts:
> 
> sudo losetup /dev/loop/0 foo
> sudo mke2fs /dev/loop/0
> sudo mkdir /mnt/loop
> sudo mount /dev/loop/0 /mnt/loop
> cat /proc/mounts
> [...]
> /dev/loop/0 /mnt/loop ext2 rw,nogrpid 0 0
> 
> How would the problem arise?

I have been always told that /etc/mtab has MORE data about loopback mounts
than /proc/mount, so you may have to compare them.

I repeat my idea: we should parse /etc/mtab, THEN parse /proc/mounts (and
that does mean read /proc/mounts only after completing /etc/mtab).  That
will take care of everything, I think.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh