From: Tao Ma <tao.ma@oracle.com>
Date: Mon, 24 Aug 2009 03:13:37 +0000 (+0800)
Subject: ocfs2: Add refcount tree lock mechanism.
X-Git-Tag: v2.6.32-rc1~173^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=374a263e790c4de85844283c098810a92985f623;p=pandora-kernel.git

ocfs2: Add refcount tree lock mechanism.

Implement locking around struct ocfs2_refcount_tree.  This protects
all read/write operations on refcount trees.  ocfs2_refcount_tree
has its own lock and its own caching_info, protecting buffers among
multiple nodes.

User must call ocfs2_lock_refcount_tree before his operation on
the tree and unlock it after that.

ocfs2_refcount_trees are referenced by the block number of the
refcount tree root block, So we create an rb-tree on the ocfs2_super
to look them up.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
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