[Ocfs2-devel] [RFC] configfs: Pin configfs subsystems separately from new config_items.

[Joel Becker]

On Mon, Jun 23, 2008 at 05:44:57PM +0200, Louis Rilling wrote:
> make_item()
> 	new_item = kmalloc();
> 	config_item_init_type_long_name();
> 	return new_item;
> 
> drop_item(item)
> 	config_item_put(item);
> 	kfree(item);

	This is never, ever safe.  Consider that someone has an
attribute file open - it has a reference to the item.  You can still
rmdir() the item - doing stuff to the attribute after drop_item() will
just get ignored.  But you can't free it in drop_item().

Joel

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Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127