Re: OOM & [OT] util-linux-2.12e

[Helge Hafting]

Olaf Hering wrote:

> On Mon, Sep 20, Helge Hafting wrote:
>
>  
>
> > Using a mtab that is a link to /proc/mounts fails with quota too.
> > Quta tools read /etc/mtab looking for "usrquota" and or "grpquota"
> > mount options.  These appear in a normal /etc/mtab but not in /proc/mounts,
> >    
>
> I have never played with quota. But: does the kernel or a userland tool
> if quota is active for a mount point? smells like a kernel bug.
>  
The kernel must know that quota is in use, or it'd be unable to
refuse the syscalls when someone tries to go over his quota.

From "man mount":
      grpquota / noquota / quota / usrquota
             These  options are accepted but ignored.  (However, quota 
utiliâ
             ties may react to such strings in /etc/fstab.)

quota utilities indeed react to such strings in /etc/mtab too.

Qutas aren't actually enabled when the mount options are used,
they are enabled when the "quotaon" tool runs.  I guess it uses
some special syscall or ioctl to really turn quota on.

Doing it at mount time instead, byt actually using those options,
seems saner to me.  But I guess they had their reasons. . .

Helge Hafting


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