On Thu, 2006-01-05 at 10:09 +0200, Oleg Drokin wrote:
> Hello!
>
> On Thu, Jan 05, 2006 at 02:26:47AM +0100, Trond Myklebust wrote:
> > > Searching for inode leakage in NFS code (seen in 2.6.14 and 2.6.15 at least,
> > > have not tried earlier versions), I see suspicious place in
> > > d_instantiate_unique (the only user happens to be NFS).
> > > There if we have found aliased dentry that we return, inode reference is
> > > not dropped and inode is not attached anywhere, so it seems the reference
> > > to inode is leaked in that case.
> > Yep, that looks like it ought to be the correct behaviour. Could you
> > please also add a note to this effect in the DocBook header for
> > d_instantiate_unique?
>
> Sure.
Looks good to me. ACKed
Cheers,
Trond
> --- fs/dcache.c.orig 2006-01-05 02:28:57.000000000 +0200
> +++ fs/dcache.c 2006-01-05 10:04:02.000000000 +0200
> @@ -808,10 +808,14 @@ void d_instantiate(struct dentry *entry,
> *
> * Fill in inode information in the entry. On success, it returns NULL.
> * If an unhashed alias of "entry" already exists, then we return the
> - * aliased dentry instead.
> + * aliased dentry instead and drop one reference to inode.
> *
> * Note that in order to avoid conflicts with rename() etc, the caller
> * had better be holding the parent directory semaphore.
> + *
> + * This also assumes that the inode count has been incremented
> + * (or otherwise set) by the caller to indicate that it is now
> + * in use by the dcache.
> */
> struct dentry *d_instantiate_unique(struct dentry *entry, struct inode *inode)
> {
> @@ -838,6 +842,7 @@ struct dentry *d_instantiate_unique(stru
> dget_locked(alias);
> spin_unlock(&dcache_lock);
> BUG_ON(!d_unhashed(alias));
> + iput(inode);
> return alias;
> }
> list_add(&entry->d_alias, &inode->i_dentry);
>
> Bye,
> Oleg
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