On Sat November 27 2010, sf...@users.sourceforge.net wrote:
>
> sf...@users.sourceforge.net:
> > > Do you consider this a bug in aufs, though?
> >
> > No.
> > I think it is a problem of your shutdown script.
> > Generally any shutdown script executes
> > - kill all processes
> > - remount / readonly
> >
> > For the system whose root is aufs, the similar scirpt but more work is
> > necessary. In your case,
> > - remount ext3 readwrite
> > - kill all processes
> > - remount / readonly
> > I guess.
>
> I got another question in my mind.
> At the end of your rsync script,
> mount -o remount,ro ${LOWER_BRANCH}
> Why didn't this remount return an error?
>
> By rsync, a file might be renamed. So the inode became
> - its link count is zero.
> - its reference count is positive, it is still alive.
> - its dtime is not set yet. it is set when the reference count reaches
> zero (in ext3).
> For such inode, fsck _always_ reports "Deleted inode XXXX has zero
> dtime" definetly.
>
> As long as a process keeps opening a file, aufs has to keep the
> corresponding file on a branch opened too. It means the inode reference
> count is kept positive, and its dtime keeps zero until the file is
> closed.
>
> Why does ext3 allow to be readonly in the status which fsck thinks
> error?
>
Is there an errors=remount-ro in there somewhere?
Although /etc/fstab is the obvious place to look first;
I am pretty sure it can also be set in the file system options
with tune2fs (which will also display it if set).
If set in the file system options of the file system itself,
the only way around that ro setting is to shut the file system
down and fsck it (which I think is the described symptom).
Mike
>
> J. R. Okajima
>
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