fs/driver: Add register_mtdpartition() for MTD partition

fs/driver/Make.defs

@@ -49,6 +49,9 @@ CSRCS += fs_blockpartition.c
 ifeq ($(CONFIG_MTD),y)
 CSRCS += fs_registermtddriver.c fs_unregistermtddriver.c fs_findmtddriver.c
 CSRCS += fs_mtdproxy.c
+ifeq ($(CONFIG_MTD_PARTITION),y)
+CSRCS += fs_mtdpartition.c
+endif
 endif
 
 ifneq ($(CONFIG_DISABLE_PSEUDOFS_OPERATIONS),y)

fs/driver/fs_mtdpartition.c

@@ -0,0 +1,116 @@
+/****************************************************************************
+ * fs/driver/fs_mtdpartition.c
+ *
+ *   Copyright (C) 2018 Pinecone Inc. All rights reserved.
+ *   Author: Xiang Xiao <xiaoxiang@pinecone.net>
+ *
+ * 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 <errno.h>
+
+#include <nuttx/fs/fs.h>
+#include <nuttx/mtd/mtd.h>
+
+#include "driver/driver.h"
+#include "inode/inode.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: register_mtdpartition
+ *
+ * Description:
+ *   Register a mtd partition driver inode the pseudo file system.
+ *
+ * Input Parameters:
+ *   partition  - The path to the partition inode
+ *   parent     - The path to the parent inode
+ *   firstblock - The offset in block to the partition
+ *   nblocks    - The number of block in the partition
+ *
+ * Returned Value:
+ *   Zero on success (with the inode point in 'inode'); A negated errno
+ *   value is returned on a failure (all error values returned by
+ *   inode_reserve):
+ *
+ *   EINVAL - 'path' is invalid for this operation
+ *   EEXIST - An inode already exists at 'path'
+ *   ENOMEM - Failed to allocate in-memory resources for the operation
+ *
+ ****************************************************************************/
+
+int register_mtdpartition(FAR const char *partition,
+                          mode_t mode, FAR const char *parent,
+                          off_t firstblock, size_t nblocks)
+{
+  FAR struct mtd_dev_s *part;
+  FAR struct inode *mtd;
+  int ret;
+
+  /* Find the mtd driver */
+
+  ret = find_mtddriver(parent, &mtd);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Create the mtd partition */
+
+  part = mtd_partition(mtd->u.i_mtd, firstblock, nblocks);
+  inode_release(mtd);
+  if (part == NULL)
+    {
+      return -EINVAL;
+    }
+
+#ifdef CONFIG_MTD_PARTITION_NAMES
+  mtd_setpartitionname(part, partition);
+#endif
+
+  /* Register the mtd partition */
+
+  ret = register_mtddriver(partition, part, mode, part);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  return OK;
+}
+

include/nuttx/fs/fs.h

@@ -641,11 +641,40 @@ int unregister_blockdriver(FAR const char *path);
  *
  ****************************************************************************/
 
-#ifdef CONFIG_MTD
+#ifdef CONFIG_MTD_PARTITION
 int register_mtddriver(FAR const char *path, FAR struct mtd_dev_s *mtd,
                        mode_t mode, FAR void *priv);
 #endif
 
+/****************************************************************************
+ * Name: register_mtdpartition
+ *
+ * Description:
+ *   Register a mtd partition driver inode the pseudo file system.
+ *
+ * Input Parameters:
+ *   partition  - The path to the partition inode
+ *   parent     - The path to the parent inode
+ *   firstblock - The offset in block to the partition
+ *   nblocks    - The number of block in the partition
+ *
+ * Returned Value:
+ *   Zero on success (with the inode point in 'inode'); A negated errno
+ *   value is returned on a failure (all error values returned by
+ *   inode_reserve):
+ *
+ *   EINVAL - 'path' is invalid for this operation
+ *   EEXIST - An inode already exists at 'path'
+ *   ENOMEM - Failed to allocate in-memory resources for the operation
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_MTD
+int register_mtdpartition(FAR const char *partition,
+                          mode_t mode, FAR const char *parent,
+                          off_t firstblock, size_t nblocks);
+#endif
+
 /****************************************************************************
  * Name: unregister_mtddriver
  *