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fleshing out mkfatfs logic

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@801 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-08-03 17:45:20 +00:00
parent 7089a04067
commit 9e1d3f8984
6 changed files with 598 additions and 230 deletions
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2
fs/fat/Make.defs
View File

@ -42,5 +42,5 @@ CSRCS += fs_fat32.c fs_fat32attrib.c fs_fat32util.c
# File required for mkfatfs utility function
ASRCS +=
CSRCS += fs_initmbr.c
CSRCS += fs_writefat.c
endif

14
fs/fat/fs_fat32.h
View File

@ -136,7 +136,8 @@
#define DIR_WRTDATE 24 /* 2@24: Date of last write */
#define DIR_FSTCLUSTLO 26 /* 2@26: LS first cluster number */
#define DIR_FILESIZE 28 /* 4@28: File size in bytes */
#define DIR_SIZE 32
#define DIR_SIZE 32 /* The size of one directory entry */
#define DIR_SHIFT 5 /* log2 of DIR_SIZE */
/* First byte of the directory name has special meanings: */
@ -178,14 +179,21 @@
* These offset describe the FSINFO sector
*/
#define FSI_LEADSIG 0 /* 4@0: 0x41615252 */
#define FSI_LEADSIG 0 /* 4@0: 0x41615252 = "RRaA" */
/* 480@4: Reserved (zero) */
#define FSI_STRUCTSIG 484 /* 4@484: 0x61417272 */
#define FSI_STRUCTSIG 484 /* 4@484: 0x61417272 = "rrAa" */
#define FSI_FREECOUNT 488 /* 4@488: Last free cluster count on volume */
#define FSI_NXTFREE 492 /* 4@492: Cluster number of 1st free cluster */
/* 12@496: Reserved (zero) */
#define FSI_TRAILSIG 508 /* 4@508: 0xaa550000 */
/****************************************************************************
* FAT values
*/
#define FAT_EOF 0x0ffffff8
#define FAT_BAD 0x0ffffff7
/****************************************************************************
* Access to data in raw sector data */

211
fs/fat/fs_initmbr.c
View File

@ -1,211 +0,0 @@
/****************************************************************************
* fs/fat/fs_initmbr.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
****************************************************************************/
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Name: mkfatfs_initmbr
*
* Description:
* Initialize the sector image of a masterbood record
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
* sect - Allocated memory to hold the MBR
*
* Return:
* None; caller is responsible for providing valid parameters.
*
****************************************************************************/
void mkfatfs_initmbr(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, ubyte *sect)
{
memset(sect, 0, var->fv_sectorsize);
/* 3@0: Jump instruction to boot code */
memcpy(&sect[BS_JUMP], var->fv_jump, 3);
/* 8@3: Usually "MSWIN4.1" */
strcpy(&sect[BS_OEMNAME], "NUTTX ");
/* 2@11: Bytes per sector: 512, 1024, 2048, 4096 */
MBR_PUTBYTESPERSEC(sect, var->fv_sectorsize);
/* 1@13: Sectors per allocation unit: 2**n, n=0..7 */
MBR_PUTSECPERCLUS(sect, fmt->ff_clustsize);
/* 2@14: Reserved sector count: Usually 32 */
MBR_PUTRESVDSECCOUNT(sect, fmt->ff_rsvdseccount);
/* 1@16: Number of FAT data structures: always 2 */
MBR_PUTNUMFATS(sect, fmt->ff_nfats);
/* 2@17: FAT12/16: Must be 0 for FAT32 */
MBR_PUTROOTENTCNT(sect, fmt->ff_rootdirentries);
/* 2@19: FAT12/16: Must be 0, see BS_TOTSEC32. Handled with 4@32: Total count of sectors on the volume */
if (var->fv_nsectors >= 65536)
{
MBR_PUTTOTSEC32(sect, var->fv_nsectors);
}
else
{
MBR_PUTTOTSEC16(sect, (uint16)var->fv_nsectors);
}
/* 1@21: Media code: f0, f8, f9-fa, fc-ff */
MBR_PUTMEDIA(sect, FAT_DEFAULT_MEDIA_TYPE); /* Only "hard drive" supported */
/* 2@22: FAT12/16: Must be 0, see BS32_FATSZ32 -- handled in FAT specific logic */
/* 2@24: Sectors per track geometry value and 2@26: Number of heads geometry value */
MBR_PUTSECPERTRK(sect, FAT_DEFAULT_SECPERTRK);
MBR_PUTNUMHEADS(sect, FAT_DEFAULT_NUMHEADS);
/* 4@28: Count of hidden sectors preceding FAT */
MBR_PUTHIDSEC(sect, fmt->ff_hidsec);
/* 4@32: Total count of sectors on the volume -- handled above */
/* Most of the rest of the sector depends on the FAT size */
if (fmt->ff_fatsize != 32)
{
/* 2@22: FAT12/16: Must be 0, see BS32_FATSZ32 */
MBR_PUTFATSZ16(sect, (uint16)var->fv_fatlen);
/* The following fields are only valid for FAT12/16 */
/* 1@36: Drive number for MSDOS bootstrap -- left zero */
/* 1@37: Reserved (zero) */
/* 1@38: Extended boot signature: 0x29 if following valid */
MBR_PUTBOOTSIG16(sect, EXTBOOT_SIGNATURE);
/* 4@39: Volume serial number */
MBR_PUTVOLID16(sect, fmt->ff_volumeid);
/* 11@43: Volume label */
memcpy(&sect[BS16_VOLLAB], fmt->ff_volumelabel, 11);
/* 8@54: "FAT12 ", "FAT16 ", or "FAT " */
/* Boot code may be placed in the remainder of the sector */
memcpy(&sect[BS16_BOOTCODE], var->fv_bootcode, var->fv_bootcodesize);
}
else
{
/* The following fields are only valid for FAT32 */
/* 4@36: Count of sectors occupied by one FAT */
MBR_PUTFATSZ32(sect, var->fv_fatlen);
/* 2@40: 0-3:Active FAT, 7=0 both FATS, 7=1 one FAT -- left zero*/
/* 2@42: MSB:Major LSB:Minor revision number (0.0) -- left zero */
/* 4@44: Cluster no. of 1st cluster of root dir */
MBR_PUTROOTCLUS(sect, FAT32_DEFAULT_ROOT_CLUSTER);
/* 2@48: Sector number of fsinfo structure. Usually 1. */
MBR_PUTFSINFO(sect, FAT_DEFAULT_FSINFO_SECTOR);
/* 2@50: Sector number of boot record. Usually 6 */
MBR_PUTBKBOOTSEC(sect, fmt->ff_backupboot);
/* 12@52: Reserved (zero) */
/* 1@64: Drive number for MSDOS bootstrap -- left zero */
/* 1@65: Reserved (zero) */
/* 1@66: Extended boot signature: 0x29 if following valid */
MBR_PUTBOOTSIG32(sect, EXTBOOT_SIGNATURE);
/* 4@67: Volume serial number */
MBR_PUTVOLID32(sect, fmt->ff_volumeid);
/* 11@71: Volume label */
memcpy(&sect[BS32_VOLLAB], fmt->ff_volumelabel, 11);
/* 8@82: "FAT12 ", "FAT16 ", or "FAT " */
/* Boot code may be placed in the remainder of the sector */
memcpy(&sect[BS16_BOOTCODE], var->fv_bootcode, var->fv_bootcodesize);
}
/* The magic bytes at the end of the MBR are common to FAT12/16/32 */
/* 2@510: Valid MBRs have 0x55aa here */
MBR_PUTSIGNATURE(sect, BOOT_SIGNATURE16);
}

60
fs/fat/fs_mkfatfs.h
View File

@ -64,6 +64,25 @@
#define FAT32_DEFAULT_ROOT_CLUSTER 2
/* Macros to simplify direct block driver access */
#define DEV_OPEN() \
var->fb_inode->u.i_bops->open ? \
var->fv_inode->u.i_bops->open(var->fv_inode) : \
0
#define DEV_CLOSE() \
var->fb_inode->u.i_bops->close ? \
var->fv_inode->u.i_bops->close(var->fv_inode) : \
0
#define DEV_READ(buf, sect, nsect) \
var->fv_inode->u.i_bops->read(var->fv_inode, buf, sect, nsect)
#define DEV_WRITE(buf, sect, nsect) \
var->fv_inode->u.i_bops->write(var->fv_inode, buf, sect, nsect)
#define DEV_GEOMETRY(geo) \
var->fv_inode->u.i_bops->geometry(var->fv_inode, &geo)
#define DEV_IOCTL(cmd, arg) \
var->fv_inode->u.i_bops->ioctl(var->fv_inode, cmd, arg)
/****************************************************************************
* Public Types
****************************************************************************/
@ -76,17 +95,18 @@
struct fat_var_s
{
ubyte fv_jump[3]; /* 3-byte boot jump instruction */
ubyte fv_sectshift; /* Log2 of fv_sectorsize */
uint16 fv_bootcodesize; /* Size of array at fv_bootcode */
uint32 fv_createtime; /* Creation time */
uint32 fv_sectorsize; /* Size of one hardware sector */
uint32 fv_nsectors; /* Number of sectors */
uint32 fv_fatlen; /* Size of the FAT */
ubyte *fv_rootdir; /* Allocated root directory sector */
ubyte *fv_mbr; /* Allocated master boot record image */
ubyte *fv_info; /* FAT32 info sector */
const ubyte *fv_bootcode; /* Points to boot code to put into MBR */
struct inode *fv_inode; /* The block driver "handle" */
ubyte fv_jump[3]; /* 3-byte boot jump instruction */
ubyte fv_sectshift; /* Log2 of fv_sectorsize */
ubyte fv_nrootdirsects; /* Number of root directory sectors */
uint16 fv_bootcodesize; /* Size of array at fv_bootcode */
uint32 fv_createtime; /* Creation time */
uint32 fv_sectorsize; /* Size of one hardware sector */
uint32 fv_nsectors; /* Number of sectors */
uint32 fv_nfatsects; /* Number of sectors in each FAT */
uint32 fv_clustcount; /* Number of clusters */
ubyte *fv_sect; /* Allocated working sector buffer */
const ubyte *fv_bootcode; /* Points to boot code to put into MBR */
};
/****************************************************************************
@ -105,8 +125,22 @@ extern "C" {
#define EXTERN extern
#endif
EXTERN void mkfatfs_initmbr(FAR struct fat_format_s *fmt, FAR struct fat_var_s *var, ubyte *sect)
;
/****************************************************************************
* Name: mkfatfs_writefat
*
* Description:
* Write the configured fat filesystem to the block device
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
EXTERN int mkfatfs_writefatfs(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var);
#undef EXTERN
#if defined(__cplusplus)

538
fs/fat/fs_writefat.c Normal file
View File

@ -0,0 +1,538 @@
/****************************************************************************
* fs/fat/fs_write.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: mkfatfs_initmbr
*
* Description:
* Initialize the sector image of a masterbood record
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* None; caller is responsible for providing valid parameters.
*
****************************************************************************/
static inline void mkfatfs_initmbr(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
memset(var->fv_sect, 0, var->fv_sectorsize);
/* 3@0: Jump instruction to boot code */
memcpy(&var->fv_sect[BS_JUMP], var->fv_jump, 3);
/* 8@3: Usually "MSWIN4.1" */
strcpy(&var->fv_sect[BS_OEMNAME], "NUTTX ");
/* 2@11: Bytes per sector: 512, 1024, 2048, 4096 */
MBR_PUTBYTESPERSEC(var->fv_sect, var->fv_sectorsize);
/* 1@13: Sectors per allocation unit: 2**n, n=0..7 */
MBR_PUTSECPERCLUS(var->fv_sect, fmt->ff_clustsize);
/* 2@14: Reserved sector count: Usually 32 */
MBR_PUTRESVDSECCOUNT(var->fv_sect, fmt->ff_rsvdseccount);
/* 1@16: Number of FAT data structures: always 2 */
MBR_PUTNUMFATS(var->fv_sect, fmt->ff_nfats);
/* 2@17: FAT12/16: Must be 0 for FAT32 */
MBR_PUTROOTENTCNT(var->fv_sect, fmt->ff_rootdirentries);
/* 2@19: FAT12/16: Must be 0, see BS_TOTSEC32.
* Handled with 4@32: Total count of sectors on the volume */
if (var->fv_nsectors >= 65536)
{
MBR_PUTTOTSEC32(var->fv_sect, var->fv_nsectors);
}
else
{
MBR_PUTTOTSEC16(var->fv_sect, (uint16)var->fv_nsectors);
}
/* 1@21: Media code: f0, f8, f9-fa, fc-ff */
MBR_PUTMEDIA(var->fv_sect, FAT_DEFAULT_MEDIA_TYPE); /* Only "hard drive" supported */
/* 2@22: FAT12/16: Must be 0, see BS32_FATSZ32 -- handled in FAT specific logic */
/* 2@24: Sectors per track geometry value and 2@26: Number of heads geometry value */
MBR_PUTSECPERTRK(var->fv_sect, FAT_DEFAULT_SECPERTRK);
MBR_PUTNUMHEADS(var->fv_sect, FAT_DEFAULT_NUMHEADS);
/* 4@28: Count of hidden sectors preceding FAT */
MBR_PUTHIDSEC(var->fv_sect, fmt->ff_hidsec);
/* 4@32: Total count of sectors on the volume -- handled above */
/* Most of the rest of the sector depends on the FAT size */
if (fmt->ff_fatsize != 32)
{
/* 2@22: FAT12/16: Must be 0, see BS32_FATSZ32 */
MBR_PUTFATSZ16(var->fv_sect, (uint16)var->fv_nfatsects);
/* The following fields are only valid for FAT12/16 */
/* 1@36: Drive number for MSDOS bootstrap -- left zero */
/* 1@37: Reserved (zero) */
/* 1@38: Extended boot signature: 0x29 if following valid */
MBR_PUTBOOTSIG16(var->fv_sect, EXTBOOT_SIGNATURE);
/* 4@39: Volume serial number */
MBR_PUTVOLID16(var->fv_sect, fmt->ff_volumeid);
/* 11@43: Volume label */
memcpy(&var->fv_sect[BS16_VOLLAB], fmt->ff_volumelabel, 11);
/* 8@54: "FAT12 ", "FAT16 ", or "FAT " */
if (fmt->ff_fatsize == 12)
{
memcpy(&var->fv_sect[BS16_FILESYSTYPE], "FAT12 ", 8);
}
else /* if (fmt->ff_fatsize == 16) */
{
memcpy(&var->fv_sect[BS16_FILESYSTYPE], "FAT16 ", 8);
}
/* Boot code may be placed in the remainder of the sector */
memcpy(&var->fv_sect[BS16_BOOTCODE], var->fv_bootcode, var->fv_bootcodesize);
}
else
{
/* The following fields are only valid for FAT32 */
/* 4@36: Count of sectors occupied by one FAT */
MBR_PUTFATSZ32(var->fv_sect, var->fv_nfatsects);
/* 2@40: 0-3:Active FAT, 7=0 both FATS, 7=1 one FAT -- left zero*/
/* 2@42: MSB:Major LSB:Minor revision number (0.0) -- left zero */
/* 4@44: Cluster no. of 1st cluster of root dir */
MBR_PUTROOTCLUS(var->fv_sect, FAT32_DEFAULT_ROOT_CLUSTER);
/* 2@48: Sector number of fsinfo structure. Usually 1. */
MBR_PUTFSINFO(var->fv_sect, FAT_DEFAULT_FSINFO_SECTOR);
/* 2@50: Sector number of boot record. Usually 6 */
MBR_PUTBKBOOTSEC(var->fv_sect, fmt->ff_backupboot);
/* 12@52: Reserved (zero) */
/* 1@64: Drive number for MSDOS bootstrap -- left zero */
/* 1@65: Reserved (zero) */
/* 1@66: Extended boot signature: 0x29 if following valid */
MBR_PUTBOOTSIG32(var->fv_sect, EXTBOOT_SIGNATURE);
/* 4@67: Volume serial number */
MBR_PUTVOLID32(var->fv_sect, fmt->ff_volumeid);
/* 11@71: Volume label */
memcpy(&var->fv_sect[BS32_VOLLAB], fmt->ff_volumelabel, 11);
/* 8@82: "FAT12 ", "FAT16 ", or "FAT " */
memcpy(&var->fv_sect[BS32_FILESYSTYPE], "FAT32 ", 8);
/* Boot code may be placed in the remainder of the sector */
memcpy(&var->fv_sect[BS16_BOOTCODE], var->fv_bootcode, var->fv_bootcodesize);
}
/* The magic bytes at the end of the MBR are common to FAT12/16/32 */
/* 2@510: Valid MBRs have 0x55aa here */
MBR_PUTSIGNATURE(var->fv_sect, BOOT_SIGNATURE16);
}
/****************************************************************************
* Name: mkfatfs_initfsinfo
*
* Description:
* Initialize the FAT32 FSINFO sector image
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* None; caller is responsible for providing valid parameters.
*
****************************************************************************/
static inline void mkfatfs_initfsinfo(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
memset(var->fv_sect, 0, var->fv_sectorsize);
/* 4@0: 0x41615252 = "RRaA" */
FSI_PUTLEADSIG(var->fv_sect, 0x41615252);
/* 480@4: Reserved (zero) */
/* 4@484: 0x61417272 = "rrAa" */
FSI_PUTSTRUCTSIG(var->fv_sect, 0x61417272);
/* 4@488: Last free cluster count on volume */
FSI_PUTFREECOUNT(var->fv_sect, var->fv_clustcount - 1);
/* 4@492: Cluster number of 1st free cluster */
FSI_PUTNXTFREE(var->fv_sect, FAT32_DEFAULT_ROOT_CLUSTER);
/* 12@496: Reserved (zero) */
/* 4@508: 0xaa550000 */
FSI_PUTTRAILSIG(var->fv_sect, BOOT_SIGNATURE32);
}
/****************************************************************************
* Name: mkfatfs_initrootdir
*
* Description:
* Initialize one root directory sector image
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
* sectno - On FAT32, the root directory is a cluster chain.
* This value indicates which sector of the cluster should be produced.
*
* Return:
* None; caller is responsible for providing valid parameters.
*
****************************************************************************/
static inline void mkfatfs_initrootdir(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var, int sectno)
{
memset(var->fv_sect, 0, var->fv_sectorsize);
if (sectno == 0)
{
/* It is only necessary to set data in the first sector of the directory */
if (memcmp(fmt->ff_volumelabel, " ", 11))
{
memcpy(&var->fv_sect[DIR_NAME], fmt->ff_volumelabel, 11);
}
DIR_PUTATTRIBUTES(var->fv_sect, FATATTR_VOLUMEID);
DIR_PUTCRTIME(var->fv_sect, var->fv_createtime & 0xffff);
DIR_PUTWRTTIME(var->fv_sect, var->fv_createtime & 0xffff);
DIR_PUTCRDATE(var->fv_sect, var->fv_createtime >> 16);
DIR_PUTWRTDATE(var->fv_sect, var->fv_createtime >> 16);
}
}
/****************************************************************************
* Name: mkfatfs_writembr
*
* Description:
* Write the master boot record and, for FAT32, the backup boot record and
* the fsinfo sector.
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
static inline int mkfatfs_writembr(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
int sectno;
int ret;
/* Create an image of the configured master boot record */
mkfatfs_initmbr(fmt, var);
/* Write the master boot record as sector zero */
ret = DEV_WRITE(var->fv_sect, 0, 1);
/* Write all of the reserved sectors */
memset(var->fv_sect, 0, var->fv_sectorsize);
for (sectno = 1; sectno < fmt->ff_rsvdseccount && ret >= 0; sectno++)
{
ret = DEV_WRITE(var->fv_sect, sectno, 1);
}
/* Write FAT32-specific sectors */
if (ret >= 0 && fmt->ff_fatsize == 32)
{
/* Write the backup master boot record */
if (fmt->ff_backupboot != 0)
{
/* Create another copy of the configured master boot record */
mkfatfs_initmbr(fmt, var);
/* Write it to the backup location */
ret = DEV_WRITE(var->fv_sect, fmt->ff_backupboot, 1);
}
if (ret >= 0)
{
/* Create an image of the fsinfo sector*/
mkfatfs_initfsinfo(fmt, var);
/* Write the fsinfo sector */
ret = DEV_WRITE(var->fv_sect, FAT_DEFAULT_FSINFO_SECTOR, 1);
}
}
return ret;
}
/****************************************************************************
* Name: mkfatfs_writefat
*
* Description:
* Write the FAT sectors
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
static inline int mkfatfs_writefat(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
size_t offset = fmt->ff_rsvdseccount;
int fatno;
int sectno;
int ret;
/* Loop for each FAT copy */
for (fatno = 0; fatno < fmt->ff_nfats; fatno++)
{
/* Loop for each sector in the FAT */
for (sectno = 0; sectno < var->fv_nfatsects; sectno++)
{
memset(var->fv_sect, 0, var->fv_sectorsize);
/* Mark cluster allocations in sector one of each FAT */
if (sectno == 0)
{
memset(var->fv_sect, 0, var->fv_sectorsize);
switch(fmt->ff_fatsize)
{
case 12:
/* Mark the first two full FAT entries -- 24 bits, 3 bytes total */
memset(var->fv_sect, 0xff, 3);
break;
case 16:
/* Mark the first two full FAT entries -- 32 bits, 4 bytes total */
memset(var->fv_sect, 0xff, 4);
break;
case 32:
default: /* Shouldn't happen */
/* Mark the first two full FAT entries -- 64 bits, 8 bytes total */
memset(var->fv_sect, 0xff, 8);
/* Cluster 2 is used as the root directory. Mark as EOF */
var->fv_sect[8] = 0xf8;
memset(&var->fv_sect[9], 0xff, 3);
break;
}
/* Save the media type in the first byte of the FAT */
var->fv_sect[0] = FAT_DEFAULT_MEDIA_TYPE;
}
/* Write the FAT sector */
ret = DEV_WRITE(var->fv_sect, offset, 1);
if (ret < 0)
{
return ret;
}
offset++;
}
}
return OK;
}
/****************************************************************************
* Name: mkfatfs_writerootdir
*
* Description:
* Write the root directory sectors
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
static inline int mkfatfs_writerootdir(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
size_t offset = fmt->ff_rsvdseccount + fmt->ff_nfats * var->fv_nfatsects;
int ret;
int i;
/* Write the root directory after the last FAT. This is the root directory
* area for FAT12/16, and the first cluster on FAT32.
*/
for (i = 0; i < var->fv_nrootdirsects; i++)
{
/* Format the next sector of the root directory */
mkfatfs_initrootdir(fmt, var, i);
/* Write the next sector of the root directory */
ret = DEV_WRITE(var->fv_sect, offset, 1);
if (ret < 0)
{
return ret;
}
offset++;
}
return 0;
}
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Name: mkfatfs_writefat
*
* Description:
* Write the configured fat filesystem to the block device
*
* Input:
* fmt - User specified format parameters
* var - Other format parameters that are not user specifiable
*
* Return:
* Zero on success; negated errno on failure
*
****************************************************************************/
int mkfatfs_writefatfs(FAR struct fat_format_s *fmt,
FAR struct fat_var_s *var)
{
int ret;
/* Write the master boot record (also the backup and fsinfo sectors) */
ret = mkfatfs_writembr(fmt, var);
/* Write FATs */
if (ret >= 0)
{
ret = mkfatfs_writefat(fmt, var);
}
/* Write the root directory after the last FAT. */
if (ret >= 0)
{
ret = mkfatfs_writerootdir(fmt, var);
}
return ret;
}

3
include/nuttx/mkfatfs.h
View File

@ -84,7 +84,6 @@
struct fat_format_s
{
boolean ff_bbcheck; /* TRUE: check for bad blocks */
ubyte ff_nfats; /* Number of FATs */
ubyte ff_fatsize; /* FAT size: 0 (autoselect), 12, 16, or 32 */
ubyte ff_clustsize; /* Number of sectors per cluster: 0 (autoselect) */
@ -130,7 +129,7 @@ extern "C" {
* size in 'fmt', bad cluster size in 'fmt'
* ENOENT - 'pathname' does not refer to anything in the filesystem.
* ENOTBLK - 'pathname' does not refer to a block driver
* ENOSPC - block driver does not support geometry method
* EACCESS - block driver does not support wrie or geometry methods
*
* Assumptions:
* - The caller must assure that the block driver is not mounted and not in