Re: [RFC PATCH 2/2] Add timeout feature

[Takashi Sato]

Hi,

David Chinner wrote:
> > Exactly my timeout feature is only for an application, not for
> > freeze_bdev().
> > I think it is needed for the situation we can't unfreeze from userspace.
> > (e.g. Freezing the root filesystem)
>
> Ummm - why can't you unfreeze the root fs from userspace? freezing
> only prevents modification to the filesystem. A frozen filesystem is
> effectively a read-only filesystem...
>
> On XFS:
>
> # xfs_freeze -f /
> # echo $?
> 0
> # xfs_freeze -u /
> # echo $?
> 0

Yes. If we have already logged in, we can unfreeze as above.
But if not, we cannot log in and unfreeze because the modification
of /var/log/wtmp is blocked in the log-in procedure.
The timeout feature will work in such case.

Cheers, Takashi
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