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
2026-10-27 22:13:33 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * fs/fs_openblockdriver.c
+ *
+ *   Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in pathname and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of pathname 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 <debug.h>
+#include <errno.h>
+#include <nuttx/fs/fs.h>
+
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: open_blockdriver
+ *
+ * Description:
+ *   Return the inode of the block driver specified by 'pathname'
+ *
+ * Inputs:
+ *   pathname - the full path to the block driver to be opened
+ *   mountflags - if MS_RDONLY is not set, then driver must support write
+ *     operations (see include/sys/mount.h)
+ *   ppinode - address of the location to return the inode reference
+ *
+ * Return:
+ *   Returns zero on success or a negated errno on failure:
+ *
+ *   EINVAL  - pathname or pinode is NULL
+ *   ENOENT  - No block driver of this name is registered
+ *   ENOTBLK - The inode associated with the pathname is not a block driver
+ *   EACCESS - The MS_RDONLY option was not set but this driver does not
+ *     support write access
+ *
+ ****************************************************************************/
+
+int open_blockdriver(FAR const char *pathname, int mountflags,
+                     FAR struct inode **ppinode)
+{
+  FAR struct inode *inode;
+  int ret;
+
+  /* Minimal sanity checks */
+
+#ifdef CONFIG_DEBUG
+  if (!ppinode)
+    {
+      ret = -EINVAL;
+      goto errout;
+    }
+#endif
+
+  /* Find the inode associated with this block driver name.  find_blockdriver
+   * will perform all additional error checking.
+   */
+
+  ret = find_blockdriver(pathname, mountflags, &inode);
+  if (ret < 0)
+    {
+      fdbg("Failed to file %s block driver\n", pathname);
+      goto errout;
+    }
+
+  /* Open the block driver.  Note that no mutually exclusive access
+   * to the driver is enforced here.  That must be done in the driver
+   * if needed.
+   */
+
+  if (inode->u.i_bops->open)
+    {
+      ret = inode->u.i_bops->open(inode);
+      if (ret < 0)
+        {
+          fdbg("%s driver open failed\n", pathname);
+          goto errout_with_inode;
+        }
+    }
+
+  *ppinode = inode;
+  return OK;
+
+errout_with_inode:
+  inode_release(inode);
+errout:
+  return ret;
+}