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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.h
parentf0681062b8e369d9fb6f3ce10f4e3fc8cea5f910 (diff)
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.h')
-rw-r--r--fs/ocfs2/dcache.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/ocfs2/dcache.h b/fs/ocfs2/dcache.h
index 90072771114b..f1423c2134ee 100644
--- a/fs/ocfs2/dcache.h
+++ b/fs/ocfs2/dcache.h
@@ -28,4 +28,31 @@
extern struct dentry_operations ocfs2_dentry_ops;
+struct ocfs2_dentry_lock {
+ unsigned int dl_count;
+ u64 dl_parent_blkno;
+
+ /*
+ * The ocfs2_dentry_lock keeps an inode reference until
+ * dl_lockres has been destroyed. This is usually done in
+ * ->d_iput() anyway, so there should be minimal impact.
+ */
+ struct inode *dl_inode;
+ struct ocfs2_lock_res dl_lockres;
+};
+
+static inline void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
+ struct ocfs2_dentry_lock *dl)
+{
+}
+
+static inline struct dentry *ocfs2_find_local_alias(struct inode *inode,
+ u64 parent_blkno,
+ int skip_unhashed)
+{
+ return NULL;
+}
+
+extern spinlock_t dentry_attach_lock;
+
#endif /* OCFS2_DCACHE_H */