Re: mnt_count accounting broken

From: Alexander Viro (aviro@redhat.com)
Date: Fri May 05 2000 - 06:39:19 EST


On Fri, 5 May 2000, Tigran Aivazian wrote:

> Hi Alexander,
>
> I am almost sure that you are aware of this fact but in the unlikely case
> you are not - the mnt->mnt_count behaves incorrectly which causes
> filesystems to be not-umountable when they should be. E.g. if you mount a
> ramfs filesystem and then do a bit of io on it (chdir, creat, readdir,
> unlink) so that at the end the state of the filesystem should be exactly
> the same as in the beginning, it will fail to umount because
> mnt->mnt_count > 2 (it is 3 actually).
>
> I will be finding out what causes it next.

Can you reproduce it _not_ on a ramfs?

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