Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-30 06:03:34 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * fs/fs_rewinddir.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 <dirent.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+#include <nuttx/fs/dirent.h>
+
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: rewindpseudodir
+ ****************************************************************************/
+
+static inline void rewindpseudodir(struct fs_dirent_s *idir)
+{
+  struct inode *prev;
+
+  inode_semtake();
+
+  /* Reset the position to the beginning */
+
+  prev                   = idir->u.pseudo.fd_next; /* (Save to delete later) */
+  idir->u.pseudo.fd_next = idir->fd_root;          /* The next node to visit */
+  idir->fd_position      = 0;                      /* Reset position */
+
+  /* Increment the reference count on the root=next node.  We
+   * should now have two references on the inode.
+   */
+
+  idir->fd_root->i_crefs++;
+  inode_semgive();
+
+  /* Then release the reference to the old next inode */
+
+  if (prev)
+    {
+      inode_release(prev);
+    }
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: rewinddir
+ *
+ * Description:
+ *   The  rewinddir() function resets the position of the
+ *   directory stream dir to the beginning of the directory.
+ *
+ * Inputs:
+ *   dirp -- An instance of type DIR created by a previous
+ *     call to opendir();
+ *
+ * Return:
+ *   None
+ *
+ ****************************************************************************/
+
+void rewinddir(FAR DIR *dirp)
+{
+  struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp;
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+  struct inode *inode;
+#endif
+
+  /* Sanity checks */
+
+  if (!idir || !idir->fd_root)
+    {
+      return;
+    }
+
+  /* The way we handle the readdir depends on the type of inode
+   * that we are dealing with.
+   */
+
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+  inode = idir->fd_root;
+  if (INODE_IS_MOUNTPT(inode))
+    {
+      /* The node is a file system mointpoint. Verify that the mountpoint
+       * supports the rewinddir() method
+       */
+
+      if (inode->u.i_mops && inode->u.i_mops->rewinddir)
+        {
+          /* Perform the rewinddir() operation */
+
+          inode->u.i_mops->rewinddir(inode, idir);
+        }
+    }
+  else
+#endif
+    {
+      /* The node is part of the root pseudo file system */
+
+      rewindpseudodir(idir);
+    }
+}