Changeset 320c884 in mainline for uspace/srv/vfs/vfs_node.c

Timestamp:

2007-11-04T19:47:32Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

798f364

Parents:

89cb140

Message:

A lot of more VFS prototyping.
VFS_OPEN gets reasonably complete, fix a limitation that prevented file
structures from being shared by multiple file descriptors, add functions for
file descriptor management, introduce unlink_futex and two new VFS operations
VFS_UNLINK and VFS_RENAME.

File:

• uspace/srv/vfs/vfs_node.c (modified) (1 diff)

uspace/srv/vfs/vfs_node.c

@@ -38 +38 @@
 #include "vfs.h"
 
+/** Increment reference count of a VFS node.
+ *
+ * @param node          VFS node that will have its refcnt incremented.
+ */
+void vfs_node_addref(vfs_node_t *node)
+{
+        /* TODO */
+}
+
+/** Decrement reference count of a VFS node.
+ *
+ * This function handles the case when the reference count drops to zero.
+ *
+ * @param node          VFS node that will have its refcnt decremented.
+ */
+void vfs_node_delref(vfs_node_t *node)
+{
+        /* TODO */
+}
+
+/** Find VFS node.
+ *
+ * This function will try to lookup the given triplet in the VFS node hash
+ * table. In case the triplet is not found there, a new VFS node is created.
+ * In any case, the VFS node will have its reference count incremented. Every
+ * node returned by this call should be eventually put back by calling
+ * vfs_node_put() on it.
+ *
+ * @param triplet       Triplet encoding the identity of the VFS node.
+ *
+ * @return              VFS node corresponding to the given triplet.
+ */
 vfs_node_t *vfs_node_get(vfs_triplet_t *triplet)
 {
-        return NULL;    // TODO: not implemented
+        /* TODO */
+        return NULL;
+}
+
+/** Return VFS node when no longer needed by the caller.
+ *
+ * This function will remove the reference on the VFS node created by
+ * vfs_node_get(). This function can only be called as a closing bracket to the
+ * preceding vfs_node_get() call.
+ *
+ * @param node          VFS node being released.
+ */
+void vfs_node_put(vfs_node_t *node)
+{
+        vfs_node_delref(node);
 }