linux-kernel - An incorrect assumption over radix_tree_tag

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Date:	Tue, 06 Apr 2010 17:19:49 +0100
From:	David Howells <dhowells@...hat.com>
To:	paulmck@...ux.vnet.ibm.com, npiggin@...e.de, corbet@....net
cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-cachefs@...hat.com
Subject: An incorrect assumption over radix_tree_tag_get()

Hi,

I think I've made a bad assumption over my usage of radix_tree_tag_get() in
fs/fscache/page.c.

I've assumed that radix_tree_tag_get() is protected from radix_tree_tag_set()
and radix_tree_tag_clear() by the RCU read lock.  However, now I'm not so
sure.  I think it's only protected against removal of part of the tree.

Can you confirm?

David
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