Add support for block drivers

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

1 files changed, 100 insertions, 0 deletions

diff --git a/nuttx/fs/fs_registerblockdriver.c b/nuttx/fs/fs_registerblockdriver.c
new file mode 100644
index 000000000..1e51deb37
--- /dev/null
+++ b/nuttx/fs/fs_registerblockdriver.c
@@ -0,0 +1,100 @@
+/************************************************************
+ * fs_registerblockdriver.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 <errno.h>
+#include <nuttx/fs.h>
+#include "fs_internal.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Variables
+ ************************************************************/
+
+/************************************************************
+ * Public Variables
+ ************************************************************/
+
+/************************************************************
+ * Private Functions
+ ************************************************************/
+
+/************************************************************
+ * Public Functions
+ ************************************************************/
+
+/************************************************************
+ * Name: register_driver
+ ************************************************************/
+
+STATUS register_blockdriver(const char *path,
+                            const struct block_operations *bops,
+                            mode_t mode, void *private)
+{
+  struct inode *node;
+  STATUS ret = ERROR;
+
+  /* Insert a dummy node -- we need to hold the inode semaphore
+   * to do this because we will have a momentarily bad structure.
+   */
+
+  inode_semtake();
+  node = inode_reserve(path);
+  if (node != NULL)
+    {
+        /* We have it, now populate it with block driver specific
+         * information.
+         */
+
+        INODE_SET_BLOCK(node);
+
+        node->u.i_bops  = bops;
+#ifdef CONFIG_FILE_MODE
+        node->i_mode    = mode;
+#endif
+        node->i_private = private;
+        ret             = OK;
+    }
+  inode_semgive();
+  return ret;
+}