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Continued mkfatfs work

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@802 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2008-08-05 23:52:44 +00:00
parent 9e1d3f8984
commit 8a30c6b64a
6 changed files with 153 additions and 12 deletions
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fs/fat/Make.defs
+2 -2
View File
@@ -39,8 +39,8 @@ ifeq ($(CONFIG_FS_FAT),y)
ASRCS +=
CSRCS += fs_fat32.c fs_fat32attrib.c fs_fat32util.c
# File required for mkfatfs utility function
# Files required for mkfatfs utility function
ASRCS +=
CSRCS += fs_writefat.c
CSRCS += fs_configfat.c fs_writefat.c
endif
fs/fat/fs_configfat.c
+94
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@@ -0,0 +1,94 @@
/****************************************************************************
* fs/fat/fs_configfat.c
*
* Copyright (C) 2008 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 <sys/types.h>
#include <string.h>
#include <errno.h>
#include <nuttx/fs.h>
#include <nuttx/fat.h>
#include <nuttx/mkfatfs.h>
#include "fs_internal.h"
#include "fs_fat32.h"
#include "fs_mkfatfs.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name:
*
* Description:
*
* Input:
*
* Return:
*
****************************************************************************/
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Name: mkfatfs_configfatfs
*
* Description:
* Based on the geometry of the block device and upon the caller-selected
* values, configure the FAT filesystem for the device.
*
* Input:
* fmt - Caller specified format parameters
* var - Holds disk geomtry data. Also, the location to return FAT
* configuration data
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
int mkfatfs_configfatfs(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
return OK;
}
fs/fat/fs_fat32.h
+25
View File
@@ -194,6 +194,31 @@
#define FAT_EOF 0x0ffffff8
#define FAT_BAD 0x0ffffff7
/****************************************************************************
* Maximum cluster by FAT type. This is the key value used to distinquish
* between FAT12, 16, and 32.
*/
/* FAT12: For M$, the calculation is ((1 << 12) - 19). But we will follow the
* Linux tradition of allowing slightly more clusters for FAT12.
*/
#define FAT_MAXCLUST12 ((1 << 12) - 16)
/* FAT16: For M$, the calculation is ((1 << 16) - 19). */
#define FAT_MINCLUST16 (FAT_MAXCLUST12 + 1)
#define FAT_MAXCLUST16 ((1 << 16) - 16)
/* FAT32: M$ reserves the MS 4 bits of a FAT32 FAT entry so only 18 bits are
* available. For M$, the calculation is ((1 << 28) - 19).
*/
#define FAT_MINCLUST32 65524
/* #define FAT_MINCLUST32 (FAT_MAXCLUST16 + 1) */
#define FAT_MAXCLUST32 ((1 << 28) - 16)
/****************************************************************************
* Access to data in raw sector data */
fs/fat/fs_fat32util.c
+6 -5
View File
@@ -303,11 +303,12 @@ static int fat_checkbootrecord(struct fat_mountpt_s *fs)
/* Verify the FAT32 file system type. The determination of the file
* system type is based on the number of clusters on the volume: FAT12
* volume has < 4085 cluseter, a FAT16 volume has fewer than 65,525
* clusters, and any larger is FAT32.
* volume has <= FAT_MAXCLUST12 (4084) clusters, a FAT16 volume has <=
* FAT_MINCLUST16 (microsfoft says < 65,525) clusters, and any larger
* is FAT32.
*
* Get the number of 32-bit directory entries in root directory (zero
* for FAT32.
* for FAT32).
*/
fs->fs_rootentcnt = MBR_GETROOTENTCNT(fs->fs_buffer);
@@ -382,12 +383,12 @@ static int fat_checkbootrecord(struct fat_mountpt_s *fs)
/* Finally, the test: */
if (fs->fs_nclusters < 4085)
if (fs->fs_nclusters <= FAT_MAXCLUST12)
{
fs->fs_fsinfo = 0;
fs->fs_type = FSTYPE_FAT12;
}
else if (fs->fs_nclusters < 65525)
else if (fs->fs_nclusters <= FAT_MAXCLUST16)
{
fs->fs_fsinfo = 0;
fs->fs_type = FSTYPE_FAT16;
fs/fat/fs_mkfatfs.h
+22 -2
View File
@@ -125,6 +125,25 @@ extern "C" {
#define EXTERN extern
#endif
/****************************************************************************
* Name: mkfatfs_configfatfs
*
* Description:
* Based on the geometry of the block device and upon the caller-selected
* values, configure the FAT filesystem for the device.
*
* Input:
* fmt - Caller specified format parameters
* var - Holds disk geomtry data. Also, the location to return FAT
* configuration data
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
EXTERN int mkfatfs_configfatfs(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var);
/****************************************************************************
* Name: mkfatfs_writefat
*
@@ -132,8 +151,9 @@ extern "C" {
* Write the configured fat filesystem to the block device
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
* fmt - Caller specified format parameters
* var - Other format parameters that are not caller specifiable. (Most
* set by mkfatfs_configfatfs()).
*
* Return:
* Zero on success; negated errno on failure
fs/fat/fs_writefat.c
+4 -3
View File
@@ -1,5 +1,5 @@
/****************************************************************************
* fs/fat/fs_write.c
* fs/fat/fs_writefat.c
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
@@ -504,8 +504,9 @@ static inline int mkfatfs_writerootdir(FAR struct fat_format_s *fmt,
* Write the configured fat filesystem to the block device
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
* fmt - Caller specified format parameters
* var - Other format parameters that are not caller specifiable. (Most
* set by mkfatfs_configfatfs()).
*
* Return:
* Zero on success; negated errno on failure