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Diffstat (limited to 'apps/examples/mount/ramdisk.c')
-rw-r--r-- | apps/examples/mount/ramdisk.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/apps/examples/mount/ramdisk.c b/apps/examples/mount/ramdisk.c new file mode 100644 index 000000000..f596dae52 --- /dev/null +++ b/apps/examples/mount/ramdisk.c @@ -0,0 +1,141 @@ +/**************************************************************************** + * examples/mount/ramdisk.c + * + * Copyright (C) 2008-2009 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 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 <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> + +#include <nuttx/ramdisk.h> +#include <nuttx/mkfatfs.h> + +#include "mount.h" + +#ifndef CONFIG_EXAMPLES_MOUNT_DEVNAME + +/**************************************************************************** + * Private Definitions + ****************************************************************************/ + +#define BUFFER_SIZE (CONFIG_EXAMPLES_MOUNT_NSECTORS*CONFIG_EXAMPLES_MOUNT_SECTORSIZE) + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct fat_format_s g_fmt = FAT_FORMAT_INITIALIZER; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * 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) +{ + char *pbuffer; + int ret; + + /* Allocate a buffer to hold the file system image. */ + + pbuffer = (char*)malloc(BUFFER_SIZE); + if (!pbuffer) + { + printf("create_ramdisk: Failed to allocate ramdisk of size %d\n", + BUFFER_SIZE); + return -ENOMEM; + } + + /* Register a RAMDISK device to manage this RAM image */ + + ret = ramdisk_register(CONFIG_EXAMPLES_MOUNT_RAMDEVNO, + pbuffer, + CONFIG_EXAMPLES_MOUNT_NSECTORS, + CONFIG_EXAMPLES_MOUNT_SECTORSIZE, + true); + if (ret < 0) + { + printf("create_ramdisk: Failed to register ramdisk at %s: %d\n", + g_source, -ret); + free(pbuffer); + 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); + /* free(pbuffer); -- RAM disk is registered */ + return ret; + } + + return 0; +} +#endif /* !CONFIG_EXAMPLES_MOUNT_DEVNAME */ |