Re: Adding subroot information to /proc/mounts, or obtaining that through other means

Ram Pai
2007-06-21T16:23:48Z

On Wed, 2007-06-20 at 14:20 -0700, H. Peter Anvin wrote:
> Al Viro wrote:
> > On Wed, Jun 20, 2007 at 01:57:33PM -0700, H. Peter Anvin wrote:
> >> ... or, alternatively, add a subfield to the first field (which would
> >> entail escaping whatever separator we choose):
> >>
> >> /dev/md6 /export ext3 rw,data=ordered 0 0
> >> /dev/md6:/users/foo /home/foo ext3 rw,data=ordered 0 0
> >> /dev/md6:/users/bar /home/bar ext3 rw,data=ordered 0 0
> >
> > Hell, no. The first field is in principle impossible to parse unless
> > you know the fs type.
> >
> > How about making a new file with sane format? From the very
> > beginning. E.g. mountpoint + ID + relative path + type + options,
> > where ID uniquely identifies superblock (e.g. numeric st_dev)
> > and backing device (if any) is sitting among the options...
>
> Okay, I see there has been some discussion on this earlier, based on a
> proposal by Ram Pai, so it pretty much comes down to redesigning this
> right. I see some issues with his proposal (device numbers exported to
> userspace in text form should be separated into major:minor form, for
> one thing.) I know the util-linux-ng people have also had issues with
> /proc/mounts that they would like resolved in order to finally nuke
> /etc/mtab.
>
> Is Ram still working on this? I'd like to help make this happen so we
> can be done with it.

Peter, I am not working on it currently. But i am interested in getting
it done. I have the seed set of patches which had Al Viro's ideas
incorporated. Infact those patches were sent on lkml 2 months back.
Shall we start with those patches?

RP

>
> -hpa
>
>