Hi Serge,
(Thanks for looking at this. I appreciate the review!)
On Mon, 17 Dec 2007, serge@xxxxxxxxxx wrote:
> > struct vfsmount *mnt = nd->mnt;
> > - struct dentry *dentry = __d_lookup(nd->dentry, name);
> > + struct dentry *dentry;
> >
> > +again:
> > + dentry = __d_lookup(nd->dentry, name);
> > if (!dentry)
> > goto need_lookup;
> > +
> > + if (dentry->d_inode && IS_REVOKE_LOCKED(dentry->d_inode)) {
>
> not sure whether this is a problem or not, but dentry->d_inode isn't
> locked here, right? So nothing is keeping do_lookup() returning
> with an inode which gets revoked between here and the return 0
> a few lines down?
I assume you mean S_REVOKE_LOCK and not ->i_mutex, right?
The caller is supposed to block open(2) with chmod(2)/chattr(2) so while
revoke is in progress, you can get references to the _revoked inode_,
which is fine (operations on it will fail with EBADFS). The
->i_revoke_wait bits are there to make sure that while we revoke, you
can't get a _new reference_ to the inode until we're done.
Pekka
-
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
