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authorMark Fasheh <mark.fasheh@oracle.com>2006-09-08 14:14:34 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2006-09-24 13:50:42 -0700
commitd680efe9d8fe0eb99d9dd063a4def6b362cdb40d (patch)
tree51e8c081c673240434dce4b44bf66fbfd4dddf30 /fs/ocfs2/dcache.c
parentf0681062b8e369d9fb6f3ce10f4e3fc8cea5f910 (diff)
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ocfs2: Add new cluster lock type
Replace the dentry vote mechanism with a cluster lock which covers a set of dentries. This allows us to force d_delete() only on nodes which actually care about an unlink. Every node that does a ->lookup() gets a read only lock on the dentry, until an unlink during which the unlinking node, will request an exclusive lock, forcing the other nodes who care about that dentry to d_delete() it. The effect is that we retain a very lightweight ->d_revalidate(), and at the same time get to make large improvements to the average case performance of the ocfs2 unlink and rename operations. This patch adds the cluster lock type which OCFS2 can attach to dentries. A small number of fs/ocfs2/dcache.c functions are stubbed out so that this change can compile. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/dcache.c')
-rw-r--r--fs/ocfs2/dcache.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index 1a01380e3878..aea457718946 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -87,6 +87,8 @@ bail:
return ret;
}
+DEFINE_SPINLOCK(dentry_attach_lock);
+
struct dentry_operations ocfs2_dentry_ops = {
.d_revalidate = ocfs2_dentry_revalidate,
};