forked from Archive/PX4-Autopilot
313 lines
8.7 KiB
C
313 lines
8.7 KiB
C
/****************************************************************************
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* fs/fat/fs_writefat.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 <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/fat.h>
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#include <nuttx/fs/mkfatfs.h>
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#include "fs_internal.h"
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#include "fs_fat32.h"
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#include "fs_mkfatfs.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mkfatfs_getgeometry
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*
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* Description:
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* Get the sector size and number of sectors of the underlying block
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* device.
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*
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* Input:
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* fmt - Caller specified format parameters
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* var - Other format parameters that are not caller specifiable. (Most
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* set by mkfatfs_configfatfs()).
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*
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* Return:
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* Zero on success; negated errno on failure
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*
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****************************************************************************/
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static inline int mkfatfs_getgeometry(FAR struct fat_format_s *fmt,
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FAR struct fat_var_s *var)
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{
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struct geometry geometry;
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int ret;
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/* Get the device geometry */
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ret = DEV_GEOMETRY(geometry);
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if (ret < 0)
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{
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fdbg("geometry() returned %d\n", ret);
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return ret;
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}
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if (!geometry.geo_available || !geometry.geo_writeenabled)
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{
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fdbg("Media is not available\n", ret);
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return -ENODEV;
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}
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/* Check if the user provided maxblocks was provided and, if so, that is it less than
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* the actual number of blocks on the device.
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*/
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if (fmt->ff_nsectors != 0)
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{
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if (fmt->ff_nsectors > geometry.geo_nsectors)
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{
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fdbg("User maxblocks (%d) exceeds blocks on device (%d)\n",
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fmt->ff_nsectors, geometry.geo_nsectors);
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return -EINVAL;
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}
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}
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else
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{
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/* Use the actual number of blocks on the device */
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fmt->ff_nsectors = geometry.geo_nsectors;
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}
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/* Verify that we can handle this sector size */
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var->fv_sectorsize = geometry.geo_sectorsize;
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switch (var->fv_sectorsize)
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{
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case 512:
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var->fv_sectshift = 9;
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break;
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case 1024:
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var->fv_sectshift = 10;
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break;
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case 2048:
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var->fv_sectshift = 11;
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break;
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case 4096:
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var->fv_sectshift = 12;
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break;
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default:
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fdbg("Unsupported sector size: %d\n", var->fv_sectorsize);
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return -EPERM;
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}
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return 0;
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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: mkfatfs
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*
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* Description:
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* Make a FAT file system image on the specified block device
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*
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* Inputs:
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* pathname - the full path to a registered block driver
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* fmt - Describes characteristics of the desired filesystem
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*
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* Return:
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* Zero (OK) on success; -1 (ERROR) on failure with errno set appropriately:
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*
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* EINVAL - NULL block driver string, bad number of FATS in 'fmt', bad FAT
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* size in 'fmt', bad cluster size in 'fmt'
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* ENOENT - 'pathname' does not refer to anything in the filesystem.
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* ENOTBLK - 'pathname' does not refer to a block driver
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* EACCES - block driver does not support wrie or geometry methods
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*
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* Assumptions:
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* - The caller must assure that the block driver is not mounted and not in
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* use when this function is called. The result of formatting a mounted
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* device is indeterminate (but likely not good).
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*
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****************************************************************************/
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int mkfatfs(FAR const char *pathname, FAR struct fat_format_s *fmt)
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{
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struct fat_var_s var;
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int ret;
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/* Initialize */
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memset(&var, 0, sizeof(struct fat_var_s));
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/* Get the filesystem creation time */
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var.fv_createtime = fat_systime2fattime();
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/* Verify format options (only when DEBUG enabled) */
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#ifdef CONFIG_DEBUG
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if (!pathname)
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{
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fdbg("No block driver path\n");
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ret = -EINVAL;
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goto errout;
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}
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if (fmt->ff_nfats < 1 || fmt->ff_nfats > 4)
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{
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fdbg("Invalid number of fats: %d\n", fmt->ff_nfats);
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ret = -EINVAL;
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goto errout;
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}
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if (fmt->ff_fattype != 0 && fmt->ff_fattype != 12 &&
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fmt->ff_fattype != 16 && fmt->ff_fattype != 32)
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{
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fdbg("Invalid FAT size: %d\n", fmt->ff_fattype);
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ret = -EINVAL;
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goto errout;
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}
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#endif
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var.fv_fattype = fmt->ff_fattype;
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/* The valid range off ff_clustshift is {0,1,..7} corresponding to
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* cluster sizes of {1,2,..128} sectors. The special value of 0xff
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* means that we should autoselect the cluster sizel.
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*/
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#ifdef CONFIG_DEBUG
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if (fmt->ff_clustshift > 7 && fmt->ff_clustshift != 0xff)
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{
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fdbg("Invalid cluster shift value: %d\n", fmt->ff_clustshift);
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ret = -EINVAL;
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goto errout;
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}
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if (fmt->ff_rootdirentries != 0 && (fmt->ff_rootdirentries < 16 || fmt->ff_rootdirentries > 32767))
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{
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fdbg("Invalid number of root dir entries: %d\n", fmt->ff_rootdirentries);
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ret = -EINVAL;
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goto errout;
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}
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if (fmt->ff_rsvdseccount != 0 && (fmt->ff_rsvdseccount < 1 || fmt->ff_rsvdseccount > 32767))
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{
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fdbg("Invalid number of reserved sectors: %d\n", fmt->ff_rsvdseccount);
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ret = -EINVAL;
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goto errout;
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}
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#endif
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/* Find the inode of the block driver indentified by 'source' */
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ret = open_blockdriver(pathname, 0, &var.fv_inode);
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if (ret < 0)
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{
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fdbg("Failed to open %s\n", pathname);
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goto errout;
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}
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/* Make sure that the inode supports the write and geometry methods at a minimum */
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if (!var.fv_inode->u.i_bops->write || !var.fv_inode->u.i_bops->geometry)
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{
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fdbg("%s does not support write or geometry methods\n", pathname);
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ret = -EACCES;
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goto errout_with_driver;
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}
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/* Determine the volume configuration based upon the input values and upon the
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* reported device geometry.
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*/
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ret = mkfatfs_getgeometry(fmt, &var);
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if (ret < 0)
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{
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goto errout_with_driver;
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}
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/* Configure the file system */
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ret = mkfatfs_configfatfs(fmt, &var);
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if (ret < 0)
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{
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goto errout_with_driver;
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}
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/* Allocate a buffer that will be working sector memory */
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var.fv_sect = (uint8_t*)malloc(var.fv_sectorsize);
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if (!var.fv_sect)
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{
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fdbg("Failed to allocate working buffers\n");
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goto errout_with_driver;
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}
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/* Write the filesystem to media */
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ret = mkfatfs_writefatfs(fmt, &var);
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errout_with_driver:
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/* Close the driver */
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(void)close_blockdriver(var.fv_inode);
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errout:
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/* Release all allocated memory */
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if (var.fv_sect)
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{
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free(var.fv_sect);
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}
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/* Return any reported errors */
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if (ret < 0)
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{
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errno = -ret;
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return ERROR;
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}
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return OK;
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}
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