Messages in this thread | | | From | "Takashi Sato" <> | Subject | Re: [RFC PATCH 2/2] Add timeout feature | Date | Wed, 2 Apr 2008 21:16:59 +0900 |
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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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