9p: implement optional loose read cache

[net-next-2.6.git] / fs / 9p / vfs_dentry.c

diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index 062daa6000ab55a33441b8bcac7aa4375727fe14..ddffd8aa902d65d1c389fc3a86d845ca62238210 100644 (file)
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -53,9 +53,30 @@
 static int v9fs_dentry_delete(struct dentry *dentry)
 {
        dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
        return 1;
 }
 
+/**
+ * v9fs_cached_dentry_delete - called when dentry refcount equals 0
+ * @dentry:  dentry in question
+ *
+ * Only return 1 if our inode is invalid.  Only non-synthetic files
+ * (ones without mtime == 0) should be calling this function.
+ *
+ */
+
+static int v9fs_cached_dentry_delete(struct dentry *dentry)
+{
+       struct inode *inode = dentry->d_inode;
+       dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+       if(!inode)
+               return 1;
+
+       return 0;
+}
+
 /**
  * v9fs_dentry_release - called when dentry is going to be freed
  * @dentry:  dentry that is being release
@@ -87,6 +108,11 @@ void v9fs_dentry_release(struct dentry *dentry)
        }
 }
 
+struct dentry_operations v9fs_cached_dentry_operations = {
+       .d_delete = v9fs_cached_dentry_delete,
+       .d_release = v9fs_dentry_release,
+};
+
 struct dentry_operations v9fs_dentry_operations = {
        .d_delete = v9fs_dentry_delete,
        .d_release = v9fs_dentry_release,