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

Helge Hafting
2004-09-20T13:28:38Z

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
utili‐
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