/**************************************************************************** * fs/fat/fs_fat32.h * * Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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. * ****************************************************************************/ #ifndef __FS_FAT_FS_FAT32_H #define __FS_FAT_FS_FAT32_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include /**************************************************************************** * Definitions ****************************************************************************/ /**************************************************************************** * These offsets describes the master boot record. * * The folowing fields are common to FAT12/16/32 (but all value descriptions * refer to the interpretation under FAT32. */ #define BS_JUMP 0 /* 3@0: Jump instruction to boot code (ignored) */ #define BS_OEMNAME 3 /* 8@3: Usually "MSWIN4.1" */ #define BS_BYTESPERSEC 11 /* 2@11: Bytes per sector: 512, 1024, 2048, 4096 */ #define BS_SECPERCLUS 13 /* 1@13: Sectors per allocation unit: 2**n, n=0..7 */ #define BS_RESVDSECCOUNT 14 /* 2@14: Reserved sector count: Usually 32 */ #define BS_NUMFATS 16 /* 1@16: Number of FAT data structures: always 2 */ #define BS_ROOTENTCNT 17 /* 2@17: FAT12/16: Must be 0 for FAT32 */ #define BS_TOTSEC16 19 /* 2@19: FAT12/16: Must be 0, see BS_TOTSEC32 */ #define BS_MEDIA 21 /* 1@21: Media code: f0, f8, f9-fa, fc-ff */ #define BS_FATSZ16 22 /* 2@22: FAT12/16: Must be 0, see BS_FATSZ32 */ #define BS_SECPERTRK 24 /* 2@24: Sectors per track geometry value */ #define BS_NUMHEADS 26 /* 2@26: Number of heads geometry value */ #define BS_HIDSEC 28 /* 4@28: Count of hidden sectors preceding FAT */ #define BS_TOTSEC32 32 /* 4@32: Total count of sectors on the volume */ /* The following fields are only valid for FAT12/16 */ #define BS16_DRVNUM 36 /* 1@36: Drive number for MSDOS bootstrap */ /* 1@37: Reserved (zero) */ #define BS16_BOOTSIG 38 /* 1@38: Extended boot signature: 0x29 if following valid */ #define BS16_VOLID 39 /* 4@39: Volume serial number */ #define BS16_VOLLAB 43 /* 11@43: Volume label */ #define BS16_FILESYSTYPE 54 /* 8@54: "FAT12 ", "FAT16 ", or "FAT " */ #define BS16_BOOTCODE 62 /* Boot code may be placed in the remainder of the sector */ #define BS16_BOOTCODESIZE 448 /* The following fields are only valid for FAT32 */ #define BS32_FATSZ32 36 /* 4@36: Count of sectors occupied by one FAT */ #define BS32_EXTFLAGS 40 /* 2@40: 0-3:Active FAT, 7=0 both FATS, 7=1 one FAT */ #define BS32_FSVER 42 /* 2@42: MSB:Major LSB:Minor revision number (0.0) */ #define BS32_ROOTCLUS 44 /* 4@44: Cluster no. of 1st cluster of root dir */ #define BS32_FSINFO 48 /* 2@48: Sector number of fsinfo structure. Usually 1. */ #define BS32_BKBOOTSEC 50 /* 2@50: Sector number of boot record. Usually 6 */ /* 12@52: Reserved (zero) */ #define BS32_DRVNUM 64 /* 1@64: Drive number for MSDOS bootstrap */ /* 1@65: Reserved (zero) */ #define BS32_BOOTSIG 66 /* 1@66: Extended boot signature: 0x29 if following valid */ #define BS32_VOLID 67 /* 4@67: Volume serial number */ #define BS32_VOLLAB 71 /* 11@71: Volume label */ #define BS32_FILESYSTYPE 82 /* 8@82: "FAT12 ", "FAT16 ", or "FAT " */ #define BS32_BOOTCODE 90 /* Boot code may be placed in the remainder of the sector */ #define BS32_BOOTCODESIZE 420 /* If the sector is not an MBR, then it could have a partition table at * this offset. */ #define MBR_TABLE 446 /* The magic bytes at the end of the MBR are common to FAT12/16/32 */ #define BS_SIGNATURE 510 /* 2@510: Valid MBRs have 0x55aa here */ #define BOOT_SIGNATURE16 0xaa55 #define BOOT_SIGNATURE32 0xaa550000 /* The extended boot signature (BS16/32_BOOTSIG) */ #define EXTBOOT_SIGNATURE 0x29 /**************************************************************************** * Each FAT directory entry is 32-bytes long. The following define offsets * relative to the beginning of a directory entry. */ #define DIR_NAME 0 /* 11@ 0: NAME: 8 bytes + 3 byte extension */ #define DIR_ATTRIBUTES 11 /* 1@11: File attibutes (see below) */ #define DIR_NTRES 12 /* 1@12: Reserved for use by NT */ #define DIR_CRTTIMETENTH 13 /* 1@13: Tenth sec creation timestamp */ #define DIR_CRTIME 14 /* 2@14: Time file created */ #define DIR_CRDATE 16 /* 2@16: Date file created */ #define DIR_LASTACCDATE 18 /* 2@19: Last access date */ #define DIR_FSTCLUSTHI 20 /* 2@20: MS first cluster number */ #define DIR_WRTTIME 22 /* 2@22: Time of last write */ #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 /* The size of one directory entry */ #define DIR_SHIFT 5 /* log2 of DIR_SIZE */ /* First byte of the directory name has special meanings: */ #define DIR0_EMPTY 0xe5 /* The directory entry is empty */ #define DIR0_ALLEMPTY 0x00 /* This entry and all following are empty */ #define DIR0_E5 0x05 /* The actual value is 0xe5 */ /* NTRES flags in the FAT directory */ #define FATNTRES_LCNAME 0x08 /* Lower case in name */ #define FATNTRES_LCEXT 0x10 /* Lower case in extension */ /* Directory indexing helper. Each directory entry is 32-bytes in length. * The number of directory entries in a sector then varies with the size * of the sector supported in hardware. */ #define DIRSEC_NDXMASK(f) (((f)->fs_hwsectorsize - 1) >> 5) #define DIRSEC_NDIRS(f) (((f)->fs_hwsectorsize) >> 5) #define DIRSEC_BYTENDX(f,i) (((i) & DIRSEC_NDXMASK(fs)) << 5) #define SEC_NDXMASK(f) ((f)->fs_hwsectorsize - 1) #define SEC_NSECTORS(f,n) ((n) / (f)->fs_hwsectorsize) /**************************************************************************** * File system types */ #define FSTYPE_FAT12 0 #define FSTYPE_FAT16 1 #define FSTYPE_FAT32 2 /* File buffer flags */ #define FFBUFF_VALID 1 #define FFBUFF_DIRTY 2 #define FFBUFF_MODIFIED 4 /**************************************************************************** * These offset describe the FSINFO sector */ #define FSI_LEADSIG 0 /* 4@0: 0x41615252 = "RRaA" */ /* 480@4: Reserved (zero) */ #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 /**************************************************************************** * 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 */ #define UBYTE_VAL(p,o) (((ubyte*)(p))[o]) #define UBYTE_PTR(p,o) &UBYTE_VAL(p,o) #define UBYTE_PUT(p,o,v) (UBYTE_VAL(p,o)=(ubyte)(v)) #define UINT16_PTR(p,o) ((uint16*)UBYTE_PTR(p,o)) #define UINT16_VAL(p,o) (*UINT16_PTR(p,o)) #define UINT16_PUT(p,o,v) (UINT16_VAL(p,o)=(uint16)(v)) #define UINT32_PTR(p,o) ((uint32*)UBYTE_PTR(p,o)) #define UINT32_VAL(p,o) (*UINT32_PTR(p,o)) #define UINT32_PUT(p,o,v) (UINT32_VAL(p,o)=(uint32)(v)) /* Regardless of the endian-ness of the target or alignment of the data, no * special operations are required for byte, string or byte array accesses. * The FAT data stream is little endian so multiple byte values must be * accessed byte-by-byte for big-endian targets. */ #define MBR_GETSECPERCLUS(p) UBYTE_VAL(p,BS_SECPERCLUS) #define MBR_GETNUMFATS(p) UBYTE_VAL(p,BS_NUMFATS) #define MBR_GETMEDIA(p) UBYTE_VAL(p,BS_MEDIA) #define MBR_GETDRVNUM16(p) UBYTE_VAL(p,BS16_DRVNUM) #define MBR_GETDRVNUM32(p) UBYTE_VAL(p,BS32_DRVNUM) #define MBR_GETBOOTSIG16(p) UBYTE_VAL(p,BS16_BOOTSIG) #define MBR_GETBOOTSIG32(p) UBYTE_VAL(p,BS32_BOOTSIG) #define DIR_GETATTRIBUTES(p) UBYTE_VAL(p,DIR_ATTRIBUTES) #define DIR_GETNTRES(p) UBYTE_VAL(p,DIR_NTRES) #define DIR_GETCRTTIMETENTH(p) UBYTE_VAL(p,DIR_CRTTIMETENTH) #define MBR_PUTSECPERCLUS(p,v) UBYTE_PUT(p,BS_SECPERCLUS,v) #define MBR_PUTNUMFATS(p,v) UBYTE_PUT(p,BS_NUMFATS,v) #define MBR_PUTMEDIA(p,v) UBYTE_PUT(p,BS_MEDIA,v) #define MBR_PUTDRVNUM16(p,v) UBYTE_PUT(p,BS16_DRVNUM,v) #define MBR_PUTDRVNUM32(p,v) UBYTE_PUT(p,BS32_DRVNUM,v) #define MBR_PUTBOOTSIG16(p,v) UBYTE_PUT(p,BS16_BOOTSIG,v) #define MBR_PUTBOOTSIG32(p,v) UBYTE_PUT(p,BS32_BOOTSIG,v) #define DIR_PUTATTRIBUTES(p,v) UBYTE_PUT(p,DIR_ATTRIBUTES,v) #define DIR_PUTNTRES(p,v) UBYTE_PUT(p,DIR_NTRES,v) #define DIR_PUTCRTTIMETENTH(p,v) UBYTE_PUT(p,DIR_CRTTIMETENTH,v) /* For the all targets, unaligned values need to be accessed byte-by-byte. * Some architectures may handle unaligned accesses with special interrupt * handlers. But even in that case, it is more efficient to avoid the traps. */ /* Unaligned multi-byte access macros */ #define MBR_GETBYTESPERSEC(p) fat_getuint16(UBYTE_PTR(p,BS_BYTESPERSEC)) #define MBR_GETROOTENTCNT(p) fat_getuint16(UBYTE_PTR(p,BS_ROOTENTCNT)) #define MBR_GETTOTSEC16(p) fat_getuint16(UBYTE_PTR(p,BS_TOTSEC16)) #define MBR_GETVOLID16(p) fat_getuint32(UBYTE_PTR(p,BS16_VOLID)) #define MBR_GETVOLID32(p) fat_getuint32(UBYTE_PTR(p,BS32_VOLID)) #define MBR_PUTBYTESPERSEC(p,v) fat_putuint16(UBYTE_PTR(p,BS_BYTESPERSEC),v) #define MBR_PUTROOTENTCNT(p,v) fat_putuint16(UBYTE_PTR(p,BS_ROOTENTCNT),v) #define MBR_PUTTOTSEC16(p,v) fat_putuint16(UBYTE_PTR(p,BS_TOTSEC16),v) #define MBR_PUTVOLID16(p,v) fat_putuint32(UBYTE_PTR(p,BS16_VOLID),v) #define MBR_PUTVOLID32(p,v) fat_putuint32(UBYTE_PTR(p,BS32_VOLID),v) /* But for multi-byte values, the endian-ness of the target vs. the little * endian order of the byte stream or alignment of the data within the byte * stream can force special, byte-by-byte accesses. */ #ifdef CONFIG_ENDIAN_BIG /* If the target is big-endian, then even aligned multi-byte values must be * accessed byte-by-byte. */ # define MBR_GETRESVDSECCOUNT(p) fat_getuint16(UBYTE_PTR(p,BS_RESVDSECCOUNT)) # define MBR_GETFATSZ16(p) fat_getuint16(UBYTE_PTR(p,BS_FATSZ16)) # define MBR_GETSECPERTRK(p) fat_getuint16(UBYTE_PTR(p,BS_SECPERTRK)) # define MBR_GETNUMHEADS(p) fat_getuint16(UBYTE_PTR(p,BS_NUMHEADS)) # define MBR_GETHIDSEC(p) fat_getuint32(UBYTE_PTR(p,BS_HIDSEC)) # define MBR_GETTOTSEC32(p) fat_getuint32(UBYTE_PTR(p,BS_TOTSEC32)) # define MBR_GETFATSZ32(p) fat_getuint32(UBYTE_PTR(p,BS32_FATSZ32)) # define MBR_GETEXTFLAGS(p) fat_getuint16(UBYTE_PTR(p,BS32_EXTFLAGS)) # define MBR_GETFSVER(p) fat_getuint16(UBYTE_PTR(p,BS32_FSVER)) # define MBR_GETROOTCLUS(p) fat_getuint32(UBYTE_PTR(p,BS32_ROOTCLUS)) # define MBR_GETFSINFO(p) fat_getuint16(UBYTE_PTR(p,BS32_FSINFO)) # define MBR_GETBKBOOTSEC(p) fat_getuint16(UBYTE_PTR(p,BS32_BKBOOTSEC)) # define MBR_GETSIGNATURE(p) fat_getuint16(UBYTE_PTR(p,BS_SIGNATURE)) # define MBR_GETPARTSECTOR(s) fat_getuint32(s) # define FSI_GETLEADSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_LEADSIG)) # define FSI_GETSTRUCTSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_STRUCTSIG)) # define FSI_GETFREECOUNT(p) fat_getuint32(UBYTE_PTR(p,FSI_FREECOUNT)) # define FSI_GETNXTFREE(p) fat_getuint32(UBYTE_PTR(p,FSI_NXTFREE)) # define FSI_GETTRAILSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_TRAILSIG)) # define DIR_GETCRTIME(p) fat_getuint16(UBYTE_PTR(p,DIR_CRTIME)) # define DIR_GETCRDATE(p) fat_getuint16(UBYTE_PTR(p,DIR_CRDATE)) # define DIR_GETLASTACCDATE(p) fat_getuint16(UBYTE_PTR(p,DIR_LASTACCDATE)) # define DIR_GETFSTCLUSTHI(p) fat_getuint16(UBYTE_PTR(p,DIR_FSTCLUSTHI)) # define DIR_GETWRTTIME(p) fat_getuint16(UBYTE_PTR(p,DIR_WRTTIME)) # define DIR_GETWRTDATE(p) fat_getuint16(UBYTE_PTR(p,DIR_WRTDATE)) # define DIR_GETFSTCLUSTLO(p) fat_getuint16(UBYTE_PTR(p,DIR_FSTCLUSTLO)) # define DIR_GETFILESIZE(p) fat_getuint32(UBYTE_PTR(p,DIR_FILESIZE)) # define FSI_GETLEADSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_LEADSIG)) # define FSI_GETSTRUCTSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_STRUCTSIG)) # define FSI_GETFREECOUNT(p) fat_getuint32(UBYTE_PTR(p,FSI_FREECOUNT)) # define FSI_GETNXTFREE(p) fat_getuint32(UBYTE_PTR(p,FSI_NXTFREE)) # define FSI_GETTRAILSIG(p) fat_getuint32(UBYTE_PTR(p,FSI_TRAILSIG)) # define FAT_GETFAT16(p,i) fat_getuint16(UBYTE_PTR(p,i)) # define FAT_GETFAT32(p,i) fat_getuint32(UBYTE_PTR(p,i)) # define MBR_PUTRESVDSECCOUNT(p,v) fat_putuint16(UBYTE_PTR(p,BS_RESVDSECCOUNT,v)) # define MBR_PUTFATSZ16(p,v) fat_putuint16(UBYTE_PTR(p,BS_FATSZ16,v)) # define MBR_PUTSECPERTRK(p,v) fat_putuint16(UBYTE_PTR(p,BS_SECPERTRK,v)) # define MBR_PUTNUMHEADS(p,v) fat_putuint16(UBYTE_PTR(p,BS_NUMHEADS,v)) # define MBR_PUTHIDSEC(p,v) fat_putuint32(UBYTE_PTR(p,BS_HIDSEC,v)) # define MBR_PUTTOTSEC32(p,v) fat_putuint32(UBYTE_PTR(p,BS_TOTSEC32,v)) # define MBR_PUTFATSZ32(p,v) fat_putuint32(UBYTE_PTR(p,BS32_FATSZ32,v)) # define MBR_PUTEXTFLAGS(p,v) fat_putuint16(UBYTE_PTR(p,BS32_EXTFLAGS,v)) # define MBR_PUTFSVER(p,v) fat_putuint16(UBYTE_PTR(p,BS32_FSVER,v)) # define MBR_PUTROOTCLUS(p,v) fat_putuint32(UBYTE_PTR(p,BS32_ROOTCLUS,v)) # define MBR_PUTFSINFO(p,v) fat_putuint16(UBYTE_PTR(p,BS32_FSINFO,v)) # define MBR_PUTBKBOOTSEC(p,v) fat_putuint16(UBYTE_PTR(p,BS32_BKBOOTSEC,v)) # define MBR_PUTSIGNATURE(p,v) fat_getuint16(UBYTE_PTR(p,BS_SIGNATURE),v) # define FSI_PUTLEADSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_LEADSIG),v) # define FSI_PUTSTRUCTSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_STRUCTSIG),v) # define FSI_PUTFREECOUNT(p,v) fat_putuint32(UBYTE_PTR(p,FSI_FREECOUNT),v) # define FSI_PUTNXTFREE(p,v) fat_putuint32(UBYTE_PTR(p,FSI_NXTFREE),v) # define FSI_PUTTRAILSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_TRAILSIG),v) # define DIR_PUTCRTIME(p,v) fat_putuint16(UBYTE_PTR(p,DIR_CRTIME),v) # define DIR_PUTCRDATE(p,v) fat_putuint16(UBYTE_PTR(p,DIR_CRDATE),v) # define DIR_PUTLASTACCDATE(p,v) fat_putuint16(UBYTE_PTR(p,DIR_LASTACCDATE),v) # define DIR_PUTFSTCLUSTHI(p,v) fat_putuint16(UBYTE_PTR(p,DIR_FSTCLUSTHI),v) # define DIR_PUTWRTTIME(p,v) fat_putuint16(UBYTE_PTR(p,DIR_WRTTIME),v) # define DIR_PUTWRTDATE(p,v) fat_putuint16(UBYTE_PTR(p,DIR_WRTDATE),v) # define DIR_PUTFSTCLUSTLO(p,v) fat_putuint16(UBYTE_PTR(p,DIR_FSTCLUSTLO),v) # define DIR_PUTFILESIZE(p,v) fat_putuint32(UBYTE_PTR(p,DIR_FILESIZE),v) # define FSI_PUTLEADSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_LEADSIG),v) # define FSI_PUTSTRUCTSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_STRUCTSIG),v) # define FSI_PUTFREECOUNT(p,v) fat_putuint32(UBYTE_PTR(p,FSI_FREECOUNT),v) # define FSI_PUTNXTFREE(p,v) fat_putuint32(UBYTE_PTR(p,FSI_NXTFREE),v) # define FSI_PUTTRAILSIG(p,v) fat_putuint32(UBYTE_PTR(p,FSI_TRAILSIG),v) # define FAT_PUTFAT16(p,i,v) fat_putuint16(UBYTE_PTR(p,i),v) # define FAT_PUTFAT32(p,i,v) fat_putuint32(UBYTE_PTR(p,i),v) #else /* But nothing special has to be done for the little endian-case for access * to aligned mulitbyte values. */ # define MBR_GETRESVDSECCOUNT(p) UINT16_VAL(p,BS_RESVDSECCOUNT) # define MBR_GETFATSZ16(p) UINT16_VAL(p,BS_FATSZ16) # define MBR_GETSECPERTRK(p) UINT16_VAL(p,BS_SECPERTRK) # define MBR_GETNUMHEADS(p) UINT16_VAL(p,BS_NUMHEADS) # define MBR_GETHIDSEC(p) UINT32_VAL(p,BS_HIDSEC) # define MBR_GETTOTSEC32(p) UINT32_VAL(p,BS_TOTSEC32) # define MBR_GETFATSZ32(p) UINT32_VAL(p,BS32_FATSZ32) # define MBR_GETEXTFLAGS(p) UINT16_VAL(p,BS32_EXTFLAGS) # define MBR_GETFSVER(p) UINT16_VAL(p,BS32_FSVER) # define MBR_GETROOTCLUS(p) UINT32_VAL(p,BS32_ROOTCLUS) # define MBR_GETFSINFO(p) UINT16_VAL(p,BS32_FSINFO) # define MBR_GETBKBOOTSEC(p) UINT16_VAL(p,BS32_BKBOOTSEC) # define MBR_GETSIGNATURE(p) UINT16_VAL(p,BS_SIGNATURE) # define MBR_GETPARTSECTOR(s) (*((uint32*)(s))) # define FSI_GETLEADSIG(p) UINT32_VAL(p,FSI_LEADSIG) # define FSI_GETSTRUCTSIG(p) UINT32_VAL(p,FSI_STRUCTSIG) # define FSI_GETFREECOUNT(p) UINT32_VAL(p,FSI_FREECOUNT) # define FSI_GETNXTFREE(p) UINT32_VAL(p,FSI_NXTFREE) # define FSI_GETTRAILSIG(p) UINT32_VAL(p,FSI_TRAILSIG) # define DIR_GETCRTIME(p) UINT16_VAL(p,DIR_CRTIME) # define DIR_GETCRDATE(p) UINT16_VAL(p,DIR_CRDATE) # define DIR_GETLASTACCDATE(p) UINT16_VAL(p,DIR_LASTACCDATE) # define DIR_GETFSTCLUSTHI(p) UINT16_VAL(p,DIR_FSTCLUSTHI) # define DIR_GETWRTTIME(p) UINT16_VAL(p,DIR_WRTTIME) # define DIR_GETWRTDATE(p) UINT16_VAL(p,DIR_WRTDATE) # define DIR_GETFSTCLUSTLO(p) UINT16_VAL(p,DIR_FSTCLUSTLO) # define DIR_GETFILESIZE(p) UINT32_VAL(p,DIR_FILESIZE) # define FSI_GETLEADSIG(p) UINT32_VAL(p,FSI_LEADSIG) # define FSI_GETSTRUCTSIG(p) UINT32_VAL(p,FSI_STRUCTSIG) # define FSI_GETFREECOUNT(p) UINT32_VAL(p,FSI_FREECOUNT) # define FSI_GETNXTFREE(p) UINT32_VAL(p,FSI_NXTFREE) # define FSI_GETTRAILSIG(p) UINT32_VAL(p,FSI_TRAILSIG) # define FAT_GETFAT16(p,i) UINT16_VAL(p,i) # define FAT_GETFAT32(p,i) UINT32_VAL(p,i) # define MBR_PUTRESVDSECCOUNT(p,v) UINT16_PUT(p,BS_RESVDSECCOUNT,v) # define MBR_PUTFATSZ16(p,v) UINT16_PUT(p,BS_FATSZ16,v) # define MBR_PUTSECPERTRK(p,v) UINT16_PUT(p,BS_SECPERTRK,v) # define MBR_PUTNUMHEADS(p,v) UINT16_PUT(p,BS_NUMHEADS,v) # define MBR_PUTHIDSEC(p,v) UINT32_PUT(p,BS_HIDSEC,v) # define MBR_PUTTOTSEC32(p,v) UINT32_PUT(p,BS_TOTSEC32,v) # define MBR_PUTFATSZ32(p,v) UINT32_PUT(p,BS32_FATSZ32,v) # define MBR_PUTEXTFLAGS(p,v) UINT16_PUT(p,BS32_EXTFLAGS,v) # define MBR_PUTFSVER(p,v) UINT16_PUT(p,BS32_FSVER,v) # define MBR_PUTROOTCLUS(p,v) UINT32_PUT(p,BS32_ROOTCLUS,v) # define MBR_PUTFSINFO(p,v) UINT16_PUT(p,BS32_FSINFO,v) # define MBR_PUTBKBOOTSEC(p,v) UINT16_PUT(p,BS32_BKBOOTSEC,v) # define MBR_PUTSIGNATURE(p,v) UINT16_PUT(p,BS_SIGNATURE,v) # define FSI_PUTLEADSIG(p,v) UINT32_PUT(p,FSI_LEADSIG,v) # define FSI_PUTSTRUCTSIG(p,v) UINT32_PUT(p,FSI_STRUCTSIG,v) # define FSI_PUTFREECOUNT(p,v) UINT32_PUT(p,FSI_FREECOUNT,v) # define FSI_PUTNXTFREE(p,v) UINT32_PUT(p,FSI_NXTFREE,v) # define FSI_PUTTRAILSIG(p,v) UINT32_PUT(p,FSI_TRAILSIG,v) # define DIR_PUTCRTIME(p,v) UINT16_PUT(p,DIR_CRTIME,v) # define DIR_PUTCRDATE(p,v) UINT16_PUT(p,DIR_CRDATE,v) # define DIR_PUTLASTACCDATE(p,v) UINT16_PUT(p,DIR_LASTACCDATE,v) # define DIR_PUTFSTCLUSTHI(p,v) UINT16_PUT(p,DIR_FSTCLUSTHI,v) # define DIR_PUTWRTTIME(p,v) UINT16_PUT(p,DIR_WRTTIME,v) # define DIR_PUTWRTDATE(p,v) UINT16_PUT(p,DIR_WRTDATE,v) # define DIR_PUTFSTCLUSTLO(p,v) UINT16_PUT(p,DIR_FSTCLUSTLO,v) # define DIR_PUTFILESIZE(p,v) UINT32_PUT(p,DIR_FILESIZE,v) # define FSI_PUTLEADSIG(p,v) UINT32_PUT(p,FSI_LEADSIG,v) # define FSI_PUTSTRUCTSIG(p,v) UINT32_PUT(p,FSI_STRUCTSIG,v) # define FSI_PUTFREECOUNT(p,v) UINT32_PUT(p,FSI_FREECOUNT,v) # define FSI_PUTNXTFREE(p,v) UINT32_PUT(p,FSI_NXTFREE,v) # define FSI_PUTTRAILSIG(p,v) UINT32_PUT(p,FSI_TRAILSIG,v) # define FAT_PUTFAT16(p,i,v) UINT16_PUT(p,i,v) # define FAT_PUTFAT32(p,i,v) UINT32_PUT(p,i,v) #endif /**************************************************************************** * Public Types ****************************************************************************/ /* This structure represents the overall mountpoint state. An instance of this * structure is retained as inode private data on each mountpoint that is * mounted with a fat32 filesystem. */ struct fat_file_s; struct fat_mountpt_s { struct inode *fs_blkdriver; /* The block driver inode that hosts the FAT32 fs */ struct fat_file_s *fs_head; /* A list to all files opened on this mountpoint */ sem_t fs_sem; /* Used to assume thread-safe access */ size_t fs_hwsectorsize; /* HW: Sector size reported by block driver*/ size_t fs_hwnsectors; /* HW: The number of sectors reported by the hardware */ size_t fs_fatbase; /* Logical block of start of filesystem (past resd sectors) */ size_t fs_rootbase; /* MBR: Cluster no. of 1st cluster of root dir */ size_t fs_database; /* Logical block of start data sectors */ size_t fs_fsinfo; /* MBR: Sector number of FSINFO sector */ size_t fs_currentsector; /* The sector number buffered in fs_buffer */ uint32 fs_nclusters; /* Maximum number of data clusters */ uint32 fs_fatsize; /* MBR: Count of sectors occupied by one fat */ uint32 fs_fattotsec; /* MBR: Total count of sectors on the volume */ uint32 fs_fsifreecount; /* FSI: Last free cluster count on volume */ uint32 fs_fsinextfree; /* FSI: Cluster number of 1st free cluster */ uint16 fs_fatresvdseccount; /* MBR: The total number of reserved sectors */ uint16 fs_rootentcnt; /* MBR: Count of 32-bit root directory entries */ boolean fs_mounted; /* TRUE: The file system is ready */ boolean fs_dirty; /* TRUE: fs_buffer is dirty */ boolean fs_fsidirty; /* TRUE: FSINFO sector must be written to disk */ ubyte fs_type; /* FSTYPE_FAT12, FSTYPE_FAT16, or FSTYPE_FAT32 */ ubyte fs_fatnumfats; /* MBR: Number of FATs (probably 2) */ ubyte fs_fatsecperclus; /* MBR: Sectors per allocation unit: 2**n, n=0..7 */ ubyte *fs_buffer; /* This is an allocated buffer to hold one sector * from the device */ }; /* This structure represents on open file under the mountpoint. An instance * of this structure is retained as struct file specific information on each * opened file. */ struct fat_file_s { struct fat_file_s *ff_next; /* Retained in a singly linked list */ boolean ff_open; /* TRUE: The file is (still) open */ ubyte ff_bflags; /* The file buffer flags */ ubyte ff_oflags; /* Flags provided when file was opened */ ubyte ff_sectorsincluster; /* Sectors remaining in cluster */ uint16 ff_dirindex; /* Index into ff_dirsector to directory entry */ uint32 ff_currentcluster; /* Current cluster being accessed */ size_t ff_dirsector; /* Sector containing the directory entry */ size_t ff_position; /* File position for read/write/seek in bytes */ size_t ff_size; /* Size of the file in bytes */ size_t ff_startcluster; /* Start cluster of file on media */ size_t ff_currentsector; /* Current sector in the file buffer */ ubyte *ff_buffer; /* File buffer (for partial sector accesses) */ }; /* This structure is used internally for describing directory entries */ struct fat_dirinfo_s { ubyte fd_name[8+3]; /* Filename -- directory format*/ #ifdef CONFIG_FAT_LCNAMES ubyte fd_ntflags; /* NTRes lower case flags */ #endif struct fs_fatdir_s dir; /* Used with opendir, readdir, etc. */ ubyte *fd_entry; /* A pointer to the raw 32-byte entry */ }; /**************************************************************************** * Global Variables ****************************************************************************/ /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /* Utitilies to handle unaligned or byte swapped accesses */ EXTERN uint16 fat_getuint16(ubyte *ptr); EXTERN uint32 fat_getuint32(ubyte *ptr); EXTERN void fat_putuint16(ubyte *ptr, uint16 value16); EXTERN void fat_putuint32(ubyte *ptr, uint32 value32); /* Manage the per-mount semaphore that protects access to shared resources */ EXTERN void fat_semtake(struct fat_mountpt_s *fs); EXTERN void fat_semgive(struct fat_mountpt_s *fs); /* Get the current time for FAT creation and write times */ EXTERN uint32 fat_systime2fattime(void); EXTERN time_t fat_fattime2systime(uint16 time, uint16 date); /* Handle hardware interactions for mounting */ EXTERN int fat_mount(struct fat_mountpt_s *fs, boolean writeable); EXTERN int fat_checkmount(struct fat_mountpt_s *fs); /* low-level hardware access */ EXTERN int fat_hwread(struct fat_mountpt_s *fs, ubyte *buffer, size_t sector, unsigned int nsectors); EXTERN int fat_hwwrite(struct fat_mountpt_s *fs, ubyte *buffer, size_t sector, unsigned int nsectors); /* Cluster / cluster chain access helpers */ EXTERN ssize_t fat_cluster2sector(struct fat_mountpt_s *fs, uint32 cluster ); EXTERN ssize_t fat_getcluster(struct fat_mountpt_s *fs, uint32 clusterno); EXTERN int fat_putcluster(struct fat_mountpt_s *fs, uint32 clusterno, size_t startsector); EXTERN int fat_removechain(struct fat_mountpt_s *fs, uint32 cluster); EXTERN sint32 fat_extendchain(struct fat_mountpt_s *fs, uint32 cluster); #define fat_createchain(fs) fat_extendchain(fs, 0) /* Help for traversing directory trees */ EXTERN int fat_nextdirentry(struct fat_mountpt_s *fs, struct fs_fatdir_s *dir); EXTERN int fat_finddirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo, const char *path); EXTERN int fat_allocatedirentry(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo); EXTERN int fat_dirname2path(char *path, ubyte *direntry); /* File creation and removal helpers */ EXTERN int fat_dirtruncate(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo); EXTERN int fat_dircreate(struct fat_mountpt_s *fs, struct fat_dirinfo_s *dirinfo); EXTERN int fat_remove(struct fat_mountpt_s *fs, const char *relpath, boolean directory); /* Mountpoint and file buffer cache (for partial sector accesses) */ EXTERN int fat_fscacheflush(struct fat_mountpt_s *fs); EXTERN int fat_fscacheread(struct fat_mountpt_s *fs, size_t sector); EXTERN int fat_ffcacheflush(struct fat_mountpt_s *fs, struct fat_file_s *ff); EXTERN int fat_ffcacheread(struct fat_mountpt_s *fs, struct fat_file_s *ff, size_t sector); EXTERN int fat_ffcacheinvalidate(struct fat_mountpt_s *fs, struct fat_file_s *ff); /* FSINFO sector support */ EXTERN int fat_updatefsinfo(struct fat_mountpt_s *fs); EXTERN int fat_nfreeclusters(struct fat_mountpt_s *fs, size_t *pfreeclusters); #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __FS_FAT_FS_FAT32_H */