examples/mount/ramdisk.c

/****************************************************************************
 * apps/examples/mount/ramdisk.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <sys/boardctl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <nuttx/drivers/ramdisk.h>

#include "fsutils/mkfatfs.h"
#include "mount.h"

#ifndef CONFIG_EXAMPLES_MOUNT_DEVNAME

/****************************************************************************
 * Private Definitions
 ****************************************************************************/

#define BUFFER_SIZE \
  (CONFIG_EXAMPLES_MOUNT_NSECTORS * CONFIG_EXAMPLES_MOUNT_SECTORSIZE)

/****************************************************************************
 * Private Data
 ****************************************************************************/

static struct fat_format_s g_fmt = FAT_FORMAT_INITIALIZER;

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: create_ramdisk
 *
 * Description:
 *   Create a RAM disk of the specified size formatting with a FAT file
 *   system
 *
 * Input Parameters:
 *   None
 *
 * Return:
 *   Zero on success, a negated errno on failure.
 *
 ****************************************************************************/

int create_ramdisk(void)
{
  struct boardioc_mkrd_s desc;
  int ret;

  /* Create a RAMDISK device to manage */

  desc.minor    = CONFIG_EXAMPLES_MOUNT_RAMDEVNO;    /* Minor device number of the RAM disk. */
  desc.nsectors = CONFIG_EXAMPLES_MOUNT_NSECTORS;    /* The number of sectors in the RAM disk. */
  desc.sectsize = CONFIG_EXAMPLES_MOUNT_SECTORSIZE;  /* The size of one sector in bytes. */
  desc.rdflags  = RDFLAG_WRENABLED | RDFLAG_FUNLINK; /* See ramdisk.h. */

  ret = boardctl(BOARDIOC_MKRD, (uintptr_t)&desc);
  if (ret < 0)
    {
      printf("create_ramdisk: Failed to create ramdisk at %s: %d\n",
             g_source, -ret);
      return ret;
    }

  /* Create a FAT filesystem on the ramdisk */

  ret = mkfatfs(g_source, &g_fmt);
  if (ret < 0)
    {
      printf("create_ramdisk: Failed to create FAT filesystem on ramdisk at %s\n",
             g_source);
      return ret;
    }

  return 0;
}
#endif /* !CONFIG_EXAMPLES_MOUNT_DEVNAME */