142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
/****************************************************************************
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* examples/mount/ramdisk.c
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*
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <nuttx/ramdisk.h>
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#include <nuttx/fs/mkfatfs.h>
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#include "mount.h"
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#ifndef CONFIG_EXAMPLES_MOUNT_DEVNAME
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/****************************************************************************
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* Private Definitions
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****************************************************************************/
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#define BUFFER_SIZE (CONFIG_EXAMPLES_MOUNT_NSECTORS*CONFIG_EXAMPLES_MOUNT_SECTORSIZE)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static struct fat_format_s g_fmt = FAT_FORMAT_INITIALIZER;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: create_ramdisk
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*
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* Description:
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* Create a RAM disk of the specified size formatting with a FAT file
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* system
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*
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* Input Parameters:
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* None
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*
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* Return:
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* Zero on success, a negated errno on failure.
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*
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****************************************************************************/
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int create_ramdisk(void)
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{
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char *pbuffer;
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int ret;
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/* Allocate a buffer to hold the file system image. */
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pbuffer = (char*)malloc(BUFFER_SIZE);
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if (!pbuffer)
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{
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printf("create_ramdisk: Failed to allocate ramdisk of size %d\n",
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BUFFER_SIZE);
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return -ENOMEM;
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}
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/* Register a RAMDISK device to manage this RAM image */
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ret = ramdisk_register(CONFIG_EXAMPLES_MOUNT_RAMDEVNO,
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pbuffer,
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CONFIG_EXAMPLES_MOUNT_NSECTORS,
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CONFIG_EXAMPLES_MOUNT_SECTORSIZE,
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true);
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if (ret < 0)
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{
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printf("create_ramdisk: Failed to register ramdisk at %s: %d\n",
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g_source, -ret);
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free(pbuffer);
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return ret;
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}
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/* Create a FAT filesystem on the ramdisk */
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ret = mkfatfs(g_source, &g_fmt);
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if (ret < 0)
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{
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printf("create_ramdisk: Failed to create FAT filesystem on ramdisk at %s\n",
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g_source);
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/* free(pbuffer); -- RAM disk is registered */
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return ret;
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}
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return 0;
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}
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#endif /* !CONFIG_EXAMPLES_MOUNT_DEVNAME */
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