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authorTao Ma <tao.ma@oracle.com>2009-08-24 07:13:37 +0400
committerJoel Becker <joel.becker@oracle.com>2009-09-23 07:09:29 +0400
commit374a263e790c4de85844283c098810a92985f623 (patch)
treea72b1f072b973723ea1cf7def27608717cf1c033 /fs/ocfs2/refcounttree.h
parentc732eb16bf07f9bfb7fa72b6868462471273bdbd (diff)
downloadlinux-374a263e790c4de85844283c098810a92985f623.tar.xz
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>
Diffstat (limited to 'fs/ocfs2/refcounttree.h')
-rw-r--r--fs/ocfs2/refcounttree.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
index 9a3695cdbb53..2ea7fc52c23c 100644
--- a/fs/ocfs2/refcounttree.h
+++ b/fs/ocfs2/refcounttree.h
@@ -33,4 +33,11 @@ struct ocfs2_refcount_tree {
struct super_block *rf_sb;
};
+void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
+int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
+ struct ocfs2_refcount_tree **tree,
+ struct buffer_head **ref_bh);
+void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
+ struct ocfs2_refcount_tree *tree,
+ int rw);
#endif /* OCFS2_REFCOUNTTREE_H */