Changeset 319f4fb in mainline

Timestamp:

2010-01-24T16:05:59Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

c4aca2c

Parents:

203a090

Message:

Add vfs_nodes_refcount_sum_get().

Location:

uspace/srv/vfs

Files:

• vfs.h (modified) (1 diff)
• vfs_node.c (modified) (1 diff)

uspace/srv/vfs/vfs.h

@@ -181 +181 @@
 extern vfs_node_t *vfs_node_get(vfs_lookup_res_t *);
 extern void vfs_node_put(vfs_node_t *);
+extern unsigned vfs_nodes_refcount_sum_get(fs_handle_t, dev_handle_t);
+
 
 #define MAX_OPEN_FILES  128

uspace/srv/vfs/vfs_node.c

@@ -231 +231 @@
 }
 
+struct refcnt_data {
+        /** Sum of all reference counts for this file system instance. */
+        unsigned refcnt;
+        fs_handle_t fs_handle;
+        dev_handle_t dev_handle;
+};
+
+static void refcnt_visitor(link_t *item, void *arg)
+{
+        vfs_node_t *node = hash_table_get_instance(item, vfs_node_t, nh_link);
+        struct refcnt_data *rd = (void *) arg;
+
+        if ((node->fs_handle == rd->fs_handle) &&
+            (node->dev_handle == rd->dev_handle))
+                rd->refcnt += node->refcnt;
+}
+
+unsigned
+vfs_nodes_refcount_sum_get(fs_handle_t fs_handle, dev_handle_t dev_handle)
+{
+        struct refcnt_data rd = {
+                .refcnt = 0,
+                .fs_handle = fs_handle,
+                .dev_handle = dev_handle
+        };
+
+        fibril_mutex_lock(&nodes_mutex);
+        hash_table_apply(&nodes, refcnt_visitor, &rd);
+        fibril_mutex_unlock(&nodes_mutex);
+
+        return rd.refcnt;
+}
+
 /**
  * @}