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
2026-11-03 09:51:36 +08:00 · 2012-09-17 18:18:44 +00:00
commit 57623d42eb
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+/****************************************************************************
+ * fs/fs_statfs.c
+ *
+ *   Copyright (C) 2007-2009, 2012 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 <sys/statfs.h>
+#include <string.h>
+#include <limits.h>
+#include <sched.h>
+#include <errno.h>
+
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: statpseudo
+ ****************************************************************************/
+
+static inline int statpseudofs(FAR struct inode *inode, FAR struct statfs *buf)
+{
+  memset(buf, 0, sizeof(struct statfs));
+  buf->f_type    = PROC_SUPER_MAGIC;
+  buf->f_namelen = NAME_MAX;
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stat
+ *
+ * Return: Zero on success; -1 on failure with errno set:
+ *
+ *   EACCES  Search permission is denied for one of the directories in the
+ *           path prefix of path.
+ *   EFAULT  Bad address.
+ *   ENOENT  A component of the path path does not exist, or the path is an
+ *           empty string.
+ *   ENOMEM  Out of memory
+ *   ENOTDIR A component of the path is not a directory.
+ *   ENOSYS  The file system does not support this call.
+ *
+ ****************************************************************************/
+
+int statfs(FAR const char *path, FAR struct statfs *buf)
+{
+  FAR struct inode *inode;
+  FAR const char   *relpath = NULL;
+  int               ret     = OK;
+
+  /* Sanity checks */
+
+  if (!path || !buf)
+    {
+      ret = EFAULT;
+      goto errout;
+    }
+
+  if (!path[0])
+    {
+      ret = ENOENT;
+      goto errout;
+    }
+
+  /* Get an inode for this file */
+
+  inode = inode_find(path, &relpath);
+  if (!inode)
+    {
+      /* This name does not refer to a psudeo-inode and there is no
+       * mountpoint that includes in this path.
+       */
+
+      ret = ENOENT;
+      goto errout;
+    }
+
+  /* The way we handle the statfs depends on the type of inode that we
+   * are dealing with.
+   */
+
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+  if (INODE_IS_MOUNTPT(inode))
+    {
+      /* The node is a file system mointpoint. Verify that the mountpoint
+       * supports the statfs() method
+       */
+
+      if (inode->u.i_mops && inode->u.i_mops->statfs)
+        {
+          /* Perform the statfs() operation */
+
+          ret = inode->u.i_mops->statfs(inode, buf);
+        }
+    }
+  else
+#endif
+    {
+      /* The node is part of the root pseudo file system */
+
+      ret = statpseudofs(inode, buf);
+    }
+
+  /* Check if the statfs operation was successful */
+
+  if (ret < 0)
+    {
+      ret = -ret;
+      goto errout_with_inode;
+    }
+
+  /* Successfully statfs'ed the file */
+
+  inode_release(inode);
+  return OK;
+
+/* Failure conditions always set the errno appropriately */
+
+errout_with_inode:
+  inode_release(inode);
+errout:
+  set_errno(ret);
+  return ERROR;
+}