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