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[dm-devel] Re: [RFC PATCH 2/2] Add timeout feature



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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