Add support for block drivers

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@206 42af7a65-404d-4744-a932-0658087f49c3

fs/fs_inoderemove.c

@@ -0,0 +1,155 @@
+/****************************************************************************
+ * fs_inoderemove.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <nuttx/fs.h>
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inode_unlink
+ ****************************************************************************/
+
+static void inode_unlink(struct inode *node,
+                         struct inode *peer,
+                         struct inode *parent)
+{
+  /* If peer is non-null, then remove the node from the right of
+   * of that peer node.
+   */
+
+   if (peer)
+     {
+       peer->i_peer = node->i_peer;
+     }
+
+   /* If parent is non-null, then remove the node from head of
+    * of the list of children.
+    */
+
+   else if (parent)
+     {
+       parent->i_child = node->i_peer;
+     }
+
+   /* Otherwise, we must be removing the root inode. */
+
+   else
+     {
+        root_inode = node->i_peer;
+     }
+   node->i_peer    = NULL;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: inode_remove
+ ****************************************************************************/
+
+STATUS inode_remove(const char *path)
+{
+  const char       *name = path;
+  FAR struct inode *node;
+  FAR struct inode *left;
+  FAR struct inode *parent;
+
+  if (*path && path[0] == '/')
+    {
+      return ERROR;
+    }
+
+  /* Find the node to delete */
+
+  inode_semtake();
+  node = inode_search(&name, &left, &parent, NULL);
+  if (node)
+    {
+      /* Found it, now remove it from the tree */
+
+      inode_unlink(node, left, parent);
+
+      /* We cannot delete it if there reference to the inode */
+
+      if (node->i_crefs)
+        {
+           /* In that case, we will mark it deleted, when the FS
+            * releases the inode, we will then, finally delete
+            * the subtree.
+            */
+
+           node->i_flags |= FSNODEFLAG_DELETED;
+           inode_semgive();
+         }
+       else
+         {
+          /* And delete it now -- recursively to delete all of its children */
+
+          inode_semgive();
+          inode_free(node->i_child);
+          free(node);
+          return OK;
+        }
+    }
+
+  /* The node does not exist or it has references */
+
+  inode_semgive();
+  return ERROR;
+}