> Looks sane. However, we still have a problem here - just what would
> happen if vfsmount is detached while we were grabbing namespace
> semaphore? Refcount alone is not useful here - we might be held by
> whoever had detached the vfsmount. IOW, we should check that it's
> still attached (i.e. that mnt->mnt_parent != mnt). If it's not -
> just leave it alone, do mntput() and let whoever holds it deal with
> the sucker. No need to put it back on lists.
Right. I'll fix that too.
On a bit unrelated node, in do_unmount() why is that
DQUOT_OFF()/acct_auto_close() thing only called for the base of a tree
being detached, and not for any submounts? Is that how it's supposed
to work?
Miklos
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