/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 by Linus Nielsen Feltzing * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include #include #include #include #include #include "fat.h" #include "ata.h" #include "debug.h" #include "panic.h" #include "system.h" #include "timefuncs.h" #include "kernel.h" #define BYTES2INT16(array,pos) \ (array[pos] | (array[pos+1] << 8 )) #define BYTES2INT32(array,pos) \ ((long)array[pos] | ((long)array[pos+1] << 8 ) | \ ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 )) #define FATTYPE_FAT12 0 #define FATTYPE_FAT16 1 #define FATTYPE_FAT32 2 /* BPB offsets; generic */ #define BS_JMPBOOT 0 #define BS_OEMNAME 3 #define BPB_BYTSPERSEC 11 #define BPB_SECPERCLUS 13 #define BPB_RSVDSECCNT 14 #define BPB_NUMFATS 16 #define BPB_ROOTENTCNT 17 #define BPB_TOTSEC16 19 #define BPB_MEDIA 21 #define BPB_FATSZ16 22 #define BPB_SECPERTRK 24 #define BPB_NUMHEADS 26 #define BPB_HIDDSEC 28 #define BPB_TOTSEC32 32 /* fat12/16 */ #define BS_DRVNUM 36 #define BS_RESERVED1 37 #define BS_BOOTSIG 38 #define BS_VOLID 39 #define BS_VOLLAB 43 #define BS_FILSYSTYPE 54 /* fat32 */ #define BPB_FATSZ32 36 #define BPB_EXTFLAGS 40 #define BPB_FSVER 42 #define BPB_ROOTCLUS 44 #define BPB_FSINFO 48 #define BPB_BKBOOTSEC 50 #define BS_32_DRVNUM 64 #define BS_32_BOOTSIG 66 #define BS_32_VOLID 67 #define BS_32_VOLLAB 71 #define BS_32_FILSYSTYPE 82 #define BPB_LAST_WORD 510 /* attributes */ #define FAT_ATTR_LONG_NAME (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \ FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID) #define FAT_ATTR_LONG_NAME_MASK (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | \ FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID | \ FAT_ATTR_DIRECTORY | FAT_ATTR_ARCHIVE ) #define FATDIR_NAME 0 #define FATDIR_ATTR 11 #define FATDIR_NTRES 12 #define FATDIR_CRTTIMETENTH 13 #define FATDIR_CRTTIME 14 #define FATDIR_CRTDATE 16 #define FATDIR_LSTACCDATE 18 #define FATDIR_FSTCLUSHI 20 #define FATDIR_WRTTIME 22 #define FATDIR_WRTDATE 24 #define FATDIR_FSTCLUSLO 26 #define FATDIR_FILESIZE 28 #define FATLONG_ORDER 0 #define FATLONG_TYPE 12 #define FATLONG_CHKSUM 13 #define CLUSTERS_PER_FAT_SECTOR (SECTOR_SIZE / 4) #define CLUSTERS_PER_FAT16_SECTOR (SECTOR_SIZE / 2) #define DIR_ENTRIES_PER_SECTOR (SECTOR_SIZE / DIR_ENTRY_SIZE) #define DIR_ENTRY_SIZE 32 #define NAME_BYTES_PER_ENTRY 13 #define FAT_BAD_MARK 0x0ffffff7 #define FAT_EOF_MARK 0x0ffffff8 /* filename charset conversion table */ static const unsigned char unicode2iso8859_2[] = { 0x00, 0x00, 0xc3, 0xe3, 0xa1, 0xb1, 0xc6, 0xe6, /* 0x0100 */ 0x00, 0x00, 0x00, 0x00, 0xc8, 0xe8, 0xcf, 0xef, /* 0x0108 */ 0xd0, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0110 */ 0xca, 0xea, 0xcc, 0xec, 0x00, 0x00, 0x00, 0x00, /* 0x0118 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0120 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0128 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0130 */ 0x00, 0xc5, 0xe5, 0x00, 0x00, 0xa5, 0xb5, 0x00, /* 0x0138 */ 0x00, 0xa3, 0xb3, 0xd1, 0xf1, 0x00, 0x00, 0xd2, /* 0x0140 */ 0xf2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0148 */ 0xd5, 0xf5, 0x00, 0x00, 0xc0, 0xe0, 0x00, 0x00, /* 0x0150 */ 0xd8, 0xf8, 0xa6, 0xb6, 0x00, 0x00, 0xaa, 0xba, /* 0x0158 */ 0xa9, 0xb9, 0xde, 0xfe, 0xab, 0xbb, 0x00, 0x00, /* 0x0160 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xd9, 0xf9, /* 0x0168 */ 0xdb, 0xfb, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0170 */ 0x00, 0xac, 0xbc, 0xaf, 0xbf, 0xae, 0xbe, 0x00, /* 0x0178 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0180 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0188 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0190 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0198 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01a0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01a8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01b0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01b8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01c0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01c8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01d0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01d8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01e0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01e8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01f0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x01f8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0200 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0208 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0210 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0218 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0220 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0228 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0230 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0238 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0240 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0248 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0250 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0258 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0260 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0268 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0270 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0278 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0280 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0288 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0290 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x0298 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02a0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02a8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02b0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02b8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb7, /* 0x02c0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02c8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02d0 */ 0xa2, 0xff, 0x00, 0xb2, 0x00, 0xbd, 0x00, 0x00, /* 0x02d8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02e0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02e8 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* 0x02f0 */ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* 0x02f8 */ }; struct fsinfo { unsigned long freecount; /* last known free cluster count */ unsigned long nextfree; /* first cluster to start looking for free clusters, or 0xffffffff for no hint */ }; /* fsinfo offsets */ #define FSINFO_FREECOUNT 488 #define FSINFO_NEXTFREE 492 struct bpb { int bpb_bytspersec; /* Bytes per sector, typically 512 */ unsigned int bpb_secperclus; /* Sectors per cluster */ int bpb_rsvdseccnt; /* Number of reserved sectors */ int bpb_numfats; /* Number of FAT structures, typically 2 */ int bpb_totsec16; /* Number of sectors on the volume (old 16-bit) */ int bpb_media; /* Media type (typically 0xf0 or 0xf8) */ int bpb_fatsz16; /* Number of used sectors per FAT structure */ unsigned long bpb_totsec32; /* Number of sectors on the volume (new 32-bit) */ unsigned int last_word; /* 0xAA55 */ /**** FAT32 specific *****/ long bpb_fatsz32; long bpb_rootclus; long bpb_fsinfo; /* variables for internal use */ unsigned long fatsize; unsigned long totalsectors; unsigned long rootdirsector; unsigned long firstdatasector; unsigned long startsector; unsigned long dataclusters; struct fsinfo fsinfo; #ifdef HAVE_FAT16SUPPORT int bpb_rootentcnt; /* Number of dir entries in the root */ /* internals for FAT16 support */ bool is_fat16; /* true if we mounted a FAT16 partition, false if FAT32 */ unsigned int rootdiroffset; /* sector offset of root dir relative to start * of first pseudo cluster */ #endif /* #ifdef HAVE_FAT16SUPPORT */ #ifdef HAVE_MULTIVOLUME int drive; /* on which physical device is this located */ bool mounted; /* flag if this volume is mounted */ #endif }; static struct bpb fat_bpbs[NUM_VOLUMES]; /* mounted partition info */ static int update_fsinfo(IF_MV_NONVOID(struct bpb* fat_bpb)); static int flush_fat(IF_MV_NONVOID(struct bpb* fat_bpb)); static int bpb_is_sane(IF_MV_NONVOID(struct bpb* fat_bpb)); static void *cache_fat_sector(IF_MV2(struct bpb* fat_bpb,) long secnum, bool dirty); static int create_dos_name(const unsigned char *name, unsigned char *newname); static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,) unsigned long start); static int transfer(IF_MV2(struct bpb* fat_bpb,) unsigned long start, long count, char* buf, bool write ); #define FAT_CACHE_SIZE 0x20 #define FAT_CACHE_MASK (FAT_CACHE_SIZE-1) struct fat_cache_entry { int secnum; bool inuse; bool dirty; #ifdef HAVE_MULTIVOLUME struct bpb* fat_vol ; /* shared cache for all volumes */ #endif }; static char fat_cache_sectors[FAT_CACHE_SIZE][SECTOR_SIZE]; static struct fat_cache_entry fat_cache[FAT_CACHE_SIZE]; static struct mutex cache_mutex; static long cluster2sec(IF_MV2(struct bpb* fat_bpb,) long cluster) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif #ifdef HAVE_FAT16SUPPORT /* negative clusters (FAT16 root dir) don't get the 2 offset */ int zerocluster = cluster < 0 ? 0 : 2; #else const long zerocluster = 2; #endif if (cluster > (long)(fat_bpb->dataclusters + 1)) { DEBUGF( "cluster2sec() - Bad cluster number (%ld)\n", cluster); return -1; } return (cluster - zerocluster) * fat_bpb->bpb_secperclus + fat_bpb->firstdatasector; } long fat_startsector(IF_MV_NONVOID(int volume)) { #ifndef HAVE_MULTIVOLUME const int volume = 0; #endif struct bpb* fat_bpb = &fat_bpbs[volume]; return fat_bpb->startsector; } void fat_size(IF_MV2(int volume,) unsigned long* size, unsigned long* free) { #ifndef HAVE_MULTIVOLUME const int volume = 0; #endif struct bpb* fat_bpb = &fat_bpbs[volume]; if (size) *size = fat_bpb->dataclusters * fat_bpb->bpb_secperclus / 2; if (free) *free = fat_bpb->fsinfo.freecount * fat_bpb->bpb_secperclus / 2; } void fat_init(void) { unsigned int i; mutex_init(&cache_mutex); /* mark the FAT cache as unused */ for(i = 0;i < FAT_CACHE_SIZE;i++) { fat_cache[i].secnum = 8; /* We use a "safe" sector just in case */ fat_cache[i].inuse = false; fat_cache[i].dirty = false; #ifdef HAVE_MULTIVOLUME fat_cache[i].fat_vol = NULL; #endif } #ifdef HAVE_MULTIVOLUME /* mark the possible volumes as not mounted */ for (i=0; istartsector = startsector; #ifdef HAVE_MULTIVOLUME fat_bpb->drive = drive; #endif fat_bpb->bpb_bytspersec = BYTES2INT16(buf,BPB_BYTSPERSEC); fat_bpb->bpb_secperclus = buf[BPB_SECPERCLUS]; fat_bpb->bpb_rsvdseccnt = BYTES2INT16(buf,BPB_RSVDSECCNT); fat_bpb->bpb_numfats = buf[BPB_NUMFATS]; fat_bpb->bpb_totsec16 = BYTES2INT16(buf,BPB_TOTSEC16); fat_bpb->bpb_media = buf[BPB_MEDIA]; fat_bpb->bpb_fatsz16 = BYTES2INT16(buf,BPB_FATSZ16); fat_bpb->bpb_fatsz32 = BYTES2INT32(buf,BPB_FATSZ32); fat_bpb->bpb_totsec32 = BYTES2INT32(buf,BPB_TOTSEC32); fat_bpb->last_word = BYTES2INT16(buf,BPB_LAST_WORD); /* calculate a few commonly used values */ if (fat_bpb->bpb_fatsz16 != 0) fat_bpb->fatsize = fat_bpb->bpb_fatsz16; else fat_bpb->fatsize = fat_bpb->bpb_fatsz32; if (fat_bpb->bpb_totsec16 != 0) fat_bpb->totalsectors = fat_bpb->bpb_totsec16; else fat_bpb->totalsectors = fat_bpb->bpb_totsec32; #ifdef HAVE_FAT16SUPPORT fat_bpb->bpb_rootentcnt = BYTES2INT16(buf,BPB_ROOTENTCNT); rootdirsectors = ((fat_bpb->bpb_rootentcnt * 32) + (fat_bpb->bpb_bytspersec - 1)) / fat_bpb->bpb_bytspersec; #endif /* #ifdef HAVE_FAT16SUPPORT */ fat_bpb->firstdatasector = fat_bpb->bpb_rsvdseccnt #ifdef HAVE_FAT16SUPPORT + rootdirsectors #endif + fat_bpb->bpb_numfats * fat_bpb->fatsize; /* Determine FAT type */ datasec = fat_bpb->totalsectors - fat_bpb->firstdatasector; fat_bpb->dataclusters = datasec / fat_bpb->bpb_secperclus; #ifdef TEST_FAT /* we are sometimes testing with "illegally small" fat32 images, so we don't use the proper fat32 test case for test code */ if ( fat_bpb->bpb_fatsz16 ) #else if ( fat_bpb->dataclusters < 65525 ) #endif { /* FAT16 */ #ifdef HAVE_FAT16SUPPORT fat_bpb->is_fat16 = true; if (fat_bpb->dataclusters < 4085) { /* FAT12 */ DEBUGF("This is FAT12. Go away!\n"); return -2; } #else /* #ifdef HAVE_FAT16SUPPORT */ DEBUGF("This is not FAT32. Go away!\n"); return -2; #endif /* #ifndef HAVE_FAT16SUPPORT */ } #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) { /* FAT16 specific part of BPB */ int dirclusters; fat_bpb->rootdirsector = fat_bpb->bpb_rsvdseccnt + fat_bpb->bpb_numfats * fat_bpb->bpb_fatsz16; dirclusters = ((rootdirsectors + fat_bpb->bpb_secperclus - 1) / fat_bpb->bpb_secperclus); /* rounded up, to full clusters */ /* I assign negative pseudo cluster numbers for the root directory, their range is counted upward until -1. */ fat_bpb->bpb_rootclus = 0 - dirclusters; /* backwards, before the data */ fat_bpb->rootdiroffset = dirclusters * fat_bpb->bpb_secperclus - rootdirsectors; } else #endif /* #ifdef HAVE_FAT16SUPPORT */ { /* FAT32 specific part of BPB */ fat_bpb->bpb_rootclus = BYTES2INT32(buf,BPB_ROOTCLUS); fat_bpb->bpb_fsinfo = BYTES2INT16(buf,BPB_FSINFO); fat_bpb->rootdirsector = cluster2sec(IF_MV2(fat_bpb,) fat_bpb->bpb_rootclus); } rc = bpb_is_sane(IF_MV(fat_bpb)); if (rc < 0) { DEBUGF( "fat_mount() - BPB is not sane\n"); return rc * 10 - 3; } #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) { fat_bpb->fsinfo.freecount = 0xffffffff; /* force recalc below */ fat_bpb->fsinfo.nextfree = 0xffffffff; } else #endif /* #ifdef HAVE_FAT16SUPPORT */ { /* Read the fsinfo sector */ rc = ata_read_sectors(IF_MV2(drive,) startsector + fat_bpb->bpb_fsinfo, 1, buf); if (rc < 0) { DEBUGF( "fat_mount() - Couldn't read FSInfo (error code %d)\n", rc); return rc * 10 - 4; } fat_bpb->fsinfo.freecount = BYTES2INT32(buf, FSINFO_FREECOUNT); fat_bpb->fsinfo.nextfree = BYTES2INT32(buf, FSINFO_NEXTFREE); } /* calculate freecount if unset */ if ( fat_bpb->fsinfo.freecount == 0xffffffff ) { fat_recalc_free(IF_MV(volume)); } LDEBUGF("Freecount: %ld\n",fat_bpb->fsinfo.freecount); LDEBUGF("Nextfree: 0x%lx\n",fat_bpb->fsinfo.nextfree); LDEBUGF("Cluster count: 0x%lx\n",fat_bpb->dataclusters); LDEBUGF("Sectors per cluster: %d\n",fat_bpb->bpb_secperclus); LDEBUGF("FAT sectors: 0x%lx\n",fat_bpb->fatsize); #ifdef HAVE_MULTIVOLUME fat_bpb->mounted = true; #endif return 0; } #ifdef HAVE_HOTSWAP int fat_unmount(int volume, bool flush) { int rc; struct bpb* fat_bpb = &fat_bpbs[volume]; if(flush) { rc = flush_fat(fat_bpb); /* the clean way, while still alive */ } else { /* volume is not accessible any more, e.g. MMC removed */ int i; mutex_lock(&cache_mutex); for(i = 0;i < FAT_CACHE_SIZE;i++) { struct fat_cache_entry *fce = &fat_cache[i]; if(fce->inuse && fce->fat_vol == fat_bpb) { fce->inuse = false; /* discard all from that volume */ fce->dirty = false; } } mutex_unlock(&cache_mutex); rc = 0; } fat_bpb->mounted = false; return rc; } #endif /* #ifdef HAVE_HOTSWAP */ void fat_recalc_free(IF_MV_NONVOID(int volume)) { #ifndef HAVE_MULTIVOLUME const int volume = 0; #endif struct bpb* fat_bpb = &fat_bpbs[volume]; long free = 0; unsigned long i; #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) { for (i = 0; ifatsize; i++) { unsigned int j; unsigned short* fat = cache_fat_sector(IF_MV2(fat_bpb,) i, false); for (j = 0; j < CLUSTERS_PER_FAT16_SECTOR; j++) { unsigned int c = i * CLUSTERS_PER_FAT16_SECTOR + j; if ( c > fat_bpb->dataclusters+1 ) /* nr 0 is unused */ break; if (SWAB16(fat[j]) == 0x0000) { free++; if ( fat_bpb->fsinfo.nextfree == 0xffffffff ) fat_bpb->fsinfo.nextfree = c; } } } } else #endif /* #ifdef HAVE_FAT16SUPPORT */ { for (i = 0; ifatsize; i++) { unsigned int j; unsigned long* fat = cache_fat_sector(IF_MV2(fat_bpb,) i, false); for (j = 0; j < CLUSTERS_PER_FAT_SECTOR; j++) { unsigned long c = i * CLUSTERS_PER_FAT_SECTOR + j; if ( c > fat_bpb->dataclusters+1 ) /* nr 0 is unused */ break; if (!(SWAB32(fat[j]) & 0x0fffffff)) { free++; if ( fat_bpb->fsinfo.nextfree == 0xffffffff ) fat_bpb->fsinfo.nextfree = c; } } } } fat_bpb->fsinfo.freecount = free; update_fsinfo(IF_MV(fat_bpb)); } static int bpb_is_sane(IF_MV_NONVOID(struct bpb* fat_bpb)) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif if(fat_bpb->bpb_bytspersec != 512) { DEBUGF( "bpb_is_sane() - Error: sector size is not 512 (%d)\n", fat_bpb->bpb_bytspersec); return -1; } if((long)fat_bpb->bpb_secperclus * (long)fat_bpb->bpb_bytspersec > 128L*1024L) { DEBUGF( "bpb_is_sane() - Error: cluster size is larger than 128K " "(%d * %d = %d)\n", fat_bpb->bpb_bytspersec, fat_bpb->bpb_secperclus, fat_bpb->bpb_bytspersec * fat_bpb->bpb_secperclus); return -2; } if(fat_bpb->bpb_numfats != 2) { DEBUGF( "bpb_is_sane() - Warning: NumFATS is not 2 (%d)\n", fat_bpb->bpb_numfats); } if(fat_bpb->bpb_media != 0xf0 && fat_bpb->bpb_media < 0xf8) { DEBUGF( "bpb_is_sane() - Warning: Non-standard " "media type (0x%02x)\n", fat_bpb->bpb_media); } if(fat_bpb->last_word != 0xaa55) { DEBUGF( "bpb_is_sane() - Error: Last word is not " "0xaa55 (0x%04x)\n", fat_bpb->last_word); return -3; } if (fat_bpb->fsinfo.freecount > (fat_bpb->totalsectors - fat_bpb->firstdatasector)/ fat_bpb->bpb_secperclus) { DEBUGF( "bpb_is_sane() - Error: FSInfo.Freecount > disk size " "(0x%04lx)\n", fat_bpb->fsinfo.freecount); return -4; } return 0; } static void flush_fat_sector(struct fat_cache_entry *fce, unsigned char *sectorbuf) { int rc; int secnum; /* With multivolume, use only the FAT info from the cached sector! */ #ifdef HAVE_MULTIVOLUME secnum = fce->secnum + fce->fat_vol->startsector; #else secnum = fce->secnum + fat_bpbs[0].startsector; #endif /* Write to the first FAT */ rc = ata_write_sectors(IF_MV2(fce->fat_vol->drive,) secnum, 1, sectorbuf); if(rc < 0) { panicf("flush_fat_sector() - Could not write sector %d" " (error %d)\n", secnum, rc); } #ifdef HAVE_MULTIVOLUME if(fce->fat_vol->bpb_numfats > 1) #else if(fat_bpbs[0].bpb_numfats > 1) #endif { /* Write to the second FAT */ #ifdef HAVE_MULTIVOLUME secnum += fce->fat_vol->fatsize; #else secnum += fat_bpbs[0].fatsize; #endif rc = ata_write_sectors(IF_MV2(fce->fat_vol->drive,) secnum, 1, sectorbuf); if(rc < 0) { panicf("flush_fat_sector() - Could not write sector %d" " (error %d)\n", secnum, rc); } } fce->dirty = false; } /* Note: The returned pointer is only safely valid until the next task switch! (Any subsequent ata read/write may yield.) */ static void *cache_fat_sector(IF_MV2(struct bpb* fat_bpb,) long fatsector, bool dirty) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif long secnum = fatsector + fat_bpb->bpb_rsvdseccnt; int cache_index = secnum & FAT_CACHE_MASK; struct fat_cache_entry *fce = &fat_cache[cache_index]; unsigned char *sectorbuf = &fat_cache_sectors[cache_index][0]; int rc; mutex_lock(&cache_mutex); /* make changes atomic */ /* Delete the cache entry if it isn't the sector we want */ if(fce->inuse && (fce->secnum != secnum #ifdef HAVE_MULTIVOLUME || fce->fat_vol != fat_bpb #endif )) { /* Write back if it is dirty */ if(fce->dirty) { flush_fat_sector(fce, sectorbuf); } fce->inuse = false; } /* Load the sector if it is not cached */ if(!fce->inuse) { rc = ata_read_sectors(IF_MV2(fat_bpb->drive,) secnum + fat_bpb->startsector,1, sectorbuf); if(rc < 0) { DEBUGF( "cache_fat_sector() - Could not read sector %ld" " (error %d)\n", secnum, rc); mutex_unlock(&cache_mutex); return NULL; } fce->inuse = true; fce->secnum = secnum; #ifdef HAVE_MULTIVOLUME fce->fat_vol = fat_bpb; #endif } if (dirty) fce->dirty = true; /* dirt remains, sticky until flushed */ mutex_unlock(&cache_mutex); return sectorbuf; } static unsigned long find_free_cluster(IF_MV2(struct bpb* fat_bpb,) unsigned long startcluster) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif unsigned long sector; unsigned long offset; unsigned long i; #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) { sector = startcluster / CLUSTERS_PER_FAT16_SECTOR; offset = startcluster % CLUSTERS_PER_FAT16_SECTOR; for (i = 0; ifatsize; i++) { unsigned int j; unsigned int nr = (i + sector) % fat_bpb->fatsize; unsigned short* fat = cache_fat_sector(IF_MV2(fat_bpb,) nr, false); if ( !fat ) break; for (j = 0; j < CLUSTERS_PER_FAT16_SECTOR; j++) { int k = (j + offset) % CLUSTERS_PER_FAT16_SECTOR; if (SWAB16(fat[k]) == 0x0000) { unsigned int c = nr * CLUSTERS_PER_FAT16_SECTOR + k; /* Ignore the reserved clusters 0 & 1, and also cluster numbers out of bounds */ if ( c < 2 || c > fat_bpb->dataclusters+1 ) continue; LDEBUGF("find_free_cluster(%x) == %x\n",startcluster,c); fat_bpb->fsinfo.nextfree = c; return c; } } offset = 0; } } else #endif /* #ifdef HAVE_FAT16SUPPORT */ { sector = startcluster / CLUSTERS_PER_FAT_SECTOR; offset = startcluster % CLUSTERS_PER_FAT_SECTOR; for (i = 0; ifatsize; i++) { unsigned int j; unsigned long nr = (i + sector) % fat_bpb->fatsize; unsigned long* fat = cache_fat_sector(IF_MV2(fat_bpb,) nr, false); if ( !fat ) break; for (j = 0; j < CLUSTERS_PER_FAT_SECTOR; j++) { int k = (j + offset) % CLUSTERS_PER_FAT_SECTOR; if (!(SWAB32(fat[k]) & 0x0fffffff)) { unsigned long c = nr * CLUSTERS_PER_FAT_SECTOR + k; /* Ignore the reserved clusters 0 & 1, and also cluster numbers out of bounds */ if ( c < 2 || c > fat_bpb->dataclusters+1 ) continue; LDEBUGF("find_free_cluster(%lx) == %lx\n",startcluster,c); fat_bpb->fsinfo.nextfree = c; return c; } } offset = 0; } } LDEBUGF("find_free_cluster(%lx) == 0\n",startcluster); return 0; /* 0 is an illegal cluster number */ } static int update_fat_entry(IF_MV2(struct bpb* fat_bpb,) unsigned long entry, unsigned long val) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) { int sector = entry / CLUSTERS_PER_FAT16_SECTOR; int offset = entry % CLUSTERS_PER_FAT16_SECTOR; unsigned short* sec; val &= 0xFFFF; LDEBUGF("update_fat_entry(%x,%x)\n",entry,val); if (entry==val) panicf("Creating FAT loop: %x,%x\n",entry,val); if ( entry < 2 ) panicf("Updating reserved FAT entry %d.\n",entry); sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, true); if (!sec) { DEBUGF( "update_fat_entry() - Could not cache sector %d\n", sector); return -1; } if ( val ) { if (SWAB16(sec[offset]) == 0x0000 && fat_bpb->fsinfo.freecount > 0) fat_bpb->fsinfo.freecount--; } else { if (SWAB16(sec[offset])) fat_bpb->fsinfo.freecount++; } LDEBUGF("update_fat_entry: %d free clusters\n", fat_bpb->fsinfo.freecount); sec[offset] = SWAB16(val); } else #endif /* #ifdef HAVE_FAT16SUPPORT */ { long sector = entry / CLUSTERS_PER_FAT_SECTOR; int offset = entry % CLUSTERS_PER_FAT_SECTOR; long unsigned int* sec; LDEBUGF("update_fat_entry(%lx,%lx)\n",entry,val); if (entry==val) panicf("Creating FAT loop: %x,%x\n",entry,val); if ( entry < 2 ) panicf("Updating reserved FAT entry %d.\n",entry); sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, true); if (!sec) { DEBUGF( "update_fat_entry() - Could not cache sector %ld\n", sector); return -1; } if ( val ) { if (!(SWAB32(sec[offset]) & 0x0fffffff) && fat_bpb->fsinfo.freecount > 0) fat_bpb->fsinfo.freecount--; } else { if (SWAB32(sec[offset]) & 0x0fffffff) fat_bpb->fsinfo.freecount++; } LDEBUGF("update_fat_entry: %ld free clusters\n", fat_bpb->fsinfo.freecount); /* don't change top 4 bits */ sec[offset] &= SWAB32(0xf0000000); sec[offset] |= SWAB32(val & 0x0fffffff); } return 0; } static long read_fat_entry(IF_MV2(struct bpb* fat_bpb,) unsigned long entry) { #ifdef HAVE_FAT16SUPPORT #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif if (fat_bpb->is_fat16) { int sector = entry / CLUSTERS_PER_FAT16_SECTOR; int offset = entry % CLUSTERS_PER_FAT16_SECTOR; unsigned short* sec; sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, false); if (!sec) { DEBUGF( "read_fat_entry() - Could not cache sector %d\n", sector); return -1; } return SWAB16(sec[offset]); } else #endif /* #ifdef HAVE_FAT16SUPPORT */ { long sector = entry / CLUSTERS_PER_FAT_SECTOR; int offset = entry % CLUSTERS_PER_FAT_SECTOR; unsigned long* sec; sec = cache_fat_sector(IF_MV2(fat_bpb,) sector, false); if (!sec) { DEBUGF( "read_fat_entry() - Could not cache sector %ld\n", sector); return -1; } return SWAB32(sec[offset]) & 0x0fffffff; } } static long get_next_cluster(IF_MV2(struct bpb* fat_bpb,) long cluster) { long next_cluster; long eof_mark = FAT_EOF_MARK; #ifdef HAVE_FAT16SUPPORT #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif if (fat_bpb->is_fat16) { eof_mark &= 0xFFFF; /* only 16 bit */ if (cluster < 0) /* FAT16 root dir */ return cluster + 1; /* don't use the FAT */ } #endif next_cluster = read_fat_entry(IF_MV2(fat_bpb,) cluster); /* is this last cluster in chain? */ if ( next_cluster >= eof_mark ) return 0; else return next_cluster; } static int update_fsinfo(IF_MV_NONVOID(struct bpb* fat_bpb)) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif unsigned char fsinfo[SECTOR_SIZE]; unsigned int* intptr; int rc; #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) return 0; /* FAT16 has no FsInfo */ #endif /* #ifdef HAVE_FAT16SUPPORT */ /* update fsinfo */ rc = ata_read_sectors(IF_MV2(fat_bpb->drive,) fat_bpb->startsector + fat_bpb->bpb_fsinfo, 1,fsinfo); if (rc < 0) { DEBUGF( "flush_fat() - Couldn't read FSInfo (error code %d)\n", rc); return rc * 10 - 1; } intptr = (int*)&(fsinfo[FSINFO_FREECOUNT]); *intptr = SWAB32(fat_bpb->fsinfo.freecount); intptr = (int*)&(fsinfo[FSINFO_NEXTFREE]); *intptr = SWAB32(fat_bpb->fsinfo.nextfree); rc = ata_write_sectors(IF_MV2(fat_bpb->drive,) fat_bpb->startsector + fat_bpb->bpb_fsinfo,1,fsinfo); if (rc < 0) { DEBUGF( "flush_fat() - Couldn't write FSInfo (error code %d)\n", rc); return rc * 10 - 2; } return 0; } static int flush_fat(IF_MV_NONVOID(struct bpb* fat_bpb)) { int i; int rc; unsigned char *sec; LDEBUGF("flush_fat()\n"); mutex_lock(&cache_mutex); for(i = 0;i < FAT_CACHE_SIZE;i++) { struct fat_cache_entry *fce = &fat_cache[i]; if(fce->inuse #ifdef HAVE_MULTIVOLUME && fce->fat_vol == fat_bpb #endif && fce->dirty) { sec = fat_cache_sectors[i]; flush_fat_sector(fce, sec); } } mutex_unlock(&cache_mutex); rc = update_fsinfo(IF_MV(fat_bpb)); if (rc < 0) return rc * 10 - 3; return 0; } static void fat_time(unsigned short* date, unsigned short* time, unsigned short* tenth ) { #ifdef HAVE_RTC struct tm* tm = get_time(); if (date) *date = ((tm->tm_year - 80) << 9) | ((tm->tm_mon + 1) << 5) | tm->tm_mday; if (time) *time = (tm->tm_hour << 11) | (tm->tm_min << 5) | (tm->tm_sec >> 1); if (tenth) *tenth = (tm->tm_sec & 1) * 100; #else /* non-RTC version returns an increment from the supplied time, or a * fixed standard time/date if no time given as input */ bool next_day = false; if (time) { if (0 == *time) { /* set to 00:15:00 */ *time = (15 << 5); } else { unsigned short mins = (*time >> 5) & 0x003F; unsigned short hours = (*time >> 11) & 0x001F; if ((mins += 10) >= 60) { mins = 0; hours++; } if ((++hours) >= 24) { hours = hours - 24; next_day = true; } *time = (hours << 11) | (mins << 5); } } if (date) { if (0 == *date) { /* set to 1 August 2003 */ *date = ((2003 - 1980) << 9) | (8 << 5) | 1; } else { unsigned short day = *date & 0x001F; unsigned short month = (*date >> 5) & 0x000F; unsigned short year = (*date >> 9) & 0x007F; if (next_day) { /* do a very simple day increment - never go above 28 days */ if (++day > 28) { day = 1; if (++month > 12) { month = 1; year++; } } *date = (year << 9) | (month << 5) | day; } } } if (tenth) *tenth = 0; #endif /* HAVE_RTC */ } static int write_long_name(struct fat_file* file, unsigned int firstentry, unsigned int numentries, const unsigned char* name, const unsigned char* shortname, bool is_directory) { unsigned char buf[SECTOR_SIZE]; unsigned char* entry; unsigned int idx = firstentry % DIR_ENTRIES_PER_SECTOR; unsigned int sector = firstentry / DIR_ENTRIES_PER_SECTOR; unsigned int i, j=0; unsigned char chksum = 0; int nameidx=0, namelen = strlen(name); int rc; LDEBUGF("write_long_name(file:%lx, first:%d, num:%d, name:%s)\n", file->firstcluster, firstentry, numentries, name); rc = fat_seek(file, sector); if (rc<0) return rc * 10 - 1; rc = fat_readwrite(file, 1, buf, false); if (rc<1) return rc * 10 - 2; /* calculate shortname checksum */ for (i=11; i>0; i--) chksum = ((chksum & 1) ? 0x80 : 0) + (chksum >> 1) + shortname[j++]; /* calc position of last name segment */ if ( namelen > NAME_BYTES_PER_ENTRY ) for (nameidx=0; nameidx < (namelen - NAME_BYTES_PER_ENTRY); nameidx += NAME_BYTES_PER_ENTRY); for (i=0; i < numentries; i++) { /* new sector? */ if ( idx >= DIR_ENTRIES_PER_SECTOR ) { /* update current sector */ rc = fat_seek(file, sector); if (rc<0) return rc * 10 - 3; rc = fat_readwrite(file, 1, buf, true); if (rc<1) return rc * 10 - 4; /* read next sector */ rc = fat_readwrite(file, 1, buf, false); if (rc<0) { LDEBUGF("Failed writing new sector: %d\n",rc); return rc * 10 - 5; } if (rc==0) /* end of dir */ memset(buf, 0, sizeof buf); sector++; idx = 0; } entry = buf + idx * DIR_ENTRY_SIZE; /* verify this entry is free */ if (entry[0] && entry[0] != 0xe5 ) panicf("Dir entry %d in sector %x is not free! " "%02x %02x %02x %02x", idx, sector, entry[0], entry[1], entry[2], entry[3]); memset(entry, 0, DIR_ENTRY_SIZE); if ( i+1 < numentries ) { /* longname entry */ int k, l = nameidx; entry[FATLONG_ORDER] = numentries-i-1; if (i==0) { /* mark this as last long entry */ entry[FATLONG_ORDER] |= 0x40; /* pad name with 0xffff */ for (k=1; k<12; k++) entry[k] = 0xff; for (k=14; k<26; k++) entry[k] = 0xff; for (k=28; k<32; k++) entry[k] = 0xff; }; /* set name */ for (k=0; k<5 && l <= namelen; k++) { entry[k*2 + 1] = name[l++]; entry[k*2 + 2] = 0; } for (k=0; k<6 && l <= namelen; k++) { entry[k*2 + 14] = name[l++]; entry[k*2 + 15] = 0; } for (k=0; k<2 && l <= namelen; k++) { entry[k*2 + 28] = name[l++]; entry[k*2 + 29] = 0; } entry[FATDIR_ATTR] = FAT_ATTR_LONG_NAME; entry[FATDIR_FSTCLUSLO] = 0; entry[FATLONG_TYPE] = 0; entry[FATLONG_CHKSUM] = chksum; LDEBUGF("Longname entry %d: %s\n", idx, name+nameidx); } else { /* shortname entry */ unsigned short date=0, time=0, tenth=0; LDEBUGF("Shortname entry: %s\n", shortname); strncpy(entry + FATDIR_NAME, shortname, 11); entry[FATDIR_ATTR] = is_directory?FAT_ATTR_DIRECTORY:0; entry[FATDIR_NTRES] = 0; fat_time(&date, &time, &tenth); entry[FATDIR_CRTTIMETENTH] = tenth; *(unsigned short*)(entry + FATDIR_CRTTIME) = SWAB16(time); *(unsigned short*)(entry + FATDIR_WRTTIME) = SWAB16(time); *(unsigned short*)(entry + FATDIR_CRTDATE) = SWAB16(date); *(unsigned short*)(entry + FATDIR_WRTDATE) = SWAB16(date); *(unsigned short*)(entry + FATDIR_LSTACCDATE) = SWAB16(date); } idx++; nameidx -= NAME_BYTES_PER_ENTRY; } /* update last sector */ rc = fat_seek(file, sector); if (rc<0) return rc * 10 - 6; rc = fat_readwrite(file, 1, buf, true); if (rc<1) return rc * 10 - 7; return 0; } static int add_dir_entry(struct fat_dir* dir, struct fat_file* file, const char* name, bool is_directory, bool dotdir) { #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[dir->file.volume]; #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif unsigned char buf[SECTOR_SIZE]; unsigned char shortname[16]; int rc; unsigned int sector; bool done = false; bool eof = false; bool last = false; int entries_needed, entries_found = 0; int namelen = strlen(name); int firstentry; LDEBUGF( "add_dir_entry(%s,%lx)\n", name, file->firstcluster); #ifdef HAVE_MULTIVOLUME file->volume = dir->file.volume; /* inherit the volume, to make sure */ #endif /* The "." and ".." directory entries must not be long names */ if(dotdir) { int i; strncpy(shortname, name, 16); for(i = strlen(shortname);i < 12;i++) shortname[i] = ' '; entries_needed = 1; } else { /* create dos name */ rc = create_dos_name(name, shortname); if (rc < 0) return rc * 10 - 0; /* one dir entry needed for every 13 bytes of filename, plus one entry for the short name */ entries_needed = namelen / NAME_BYTES_PER_ENTRY + 1; if (namelen % NAME_BYTES_PER_ENTRY) entries_needed++; } restart: firstentry = 0; rc = fat_seek(&dir->file, 0); if (rc < 0) return rc * 10 - 1; for (sector=0; !done; sector++) { unsigned int i; rc = 0; if (!eof) { rc = fat_readwrite(&dir->file, 1, buf, false); } if (rc == 0) { /* eof: add new sector */ eof = true; memset(buf, 0, sizeof buf); LDEBUGF("Adding new sector to dir\n"); rc = fat_seek(&dir->file, sector); if (rc < 0) return rc * 10 - 2; /* add sectors (we must clear the whole cluster) */ do { rc = fat_readwrite(&dir->file, 1, buf, true); if (rc < 1) return rc * 10 - 3; } while (dir->file.sectornum < (int)fat_bpb->bpb_secperclus); } if (rc < 0) { DEBUGF( "add_dir_entry() - Couldn't read dir" " (error code %d)\n", rc); return rc * 10 - 4; } /* look for free slots */ for (i=0; i < DIR_ENTRIES_PER_SECTOR && !done; i++) { unsigned char firstbyte = buf[i * DIR_ENTRY_SIZE]; switch (firstbyte) { case 0: /* end of dir */ entries_found = entries_needed; LDEBUGF("Found last entry %d\n", sector * DIR_ENTRIES_PER_SECTOR + i); done = true; break; case 0xe5: /* free entry */ entries_found++; LDEBUGF("Found free entry %d (%d/%d)\n", sector * DIR_ENTRIES_PER_SECTOR + i, entries_found, entries_needed); break; default: entries_found = 0; /* check that our intended shortname doesn't already exist */ if (!strncmp(shortname, buf + i * DIR_ENTRY_SIZE, 12)) { /* filename exists already. make a new one */ snprintf(shortname+8, 4, "%03X", (unsigned)rand() & 0xfff); LDEBUGF("Duplicate shortname, changing to %s\n", shortname); /* name has changed, we need to restart search */ goto restart; } break; } if (!firstentry && (entries_found == entries_needed)) { firstentry = sector * DIR_ENTRIES_PER_SECTOR + i; /* if we're not extending the dir, we must go back to first free entry */ if (done) last = true; else firstentry -= (entries_needed - 1); } } } sector = firstentry / DIR_ENTRIES_PER_SECTOR; LDEBUGF("Adding longname to entry %d in sector %d\n", firstentry, sector); rc = write_long_name(&dir->file, firstentry, entries_needed, name, shortname, is_directory); if (rc < 0) return rc * 10 - 5; /* remember where the shortname dir entry is located */ file->direntry = firstentry + entries_needed - 1; file->direntries = entries_needed; file->dircluster = dir->file.firstcluster; LDEBUGF("Added new dir entry %d, using %d slots.\n", file->direntry, file->direntries); /* advance the end-of-dir marker? */ if (last) { unsigned int lastentry = firstentry + entries_needed; LDEBUGF("Updating end-of-dir entry %d\n",lastentry); if (lastentry % DIR_ENTRIES_PER_SECTOR) { int idx = (lastentry % DIR_ENTRIES_PER_SECTOR) * DIR_ENTRY_SIZE; rc = fat_seek(&dir->file, lastentry / DIR_ENTRIES_PER_SECTOR); if (rc < 0) return rc * 10 - 6; rc = fat_readwrite(&dir->file, 1, buf, false); if (rc < 1) return rc * 10 - 7; /* clear last entry */ buf[idx] = 0; rc = fat_seek(&dir->file, lastentry / DIR_ENTRIES_PER_SECTOR); if (rc < 0) return rc * 10 - 8; /* we must clear entire last cluster */ do { rc = fat_readwrite(&dir->file, 1, buf, true); if (rc < 1) return rc * 10 - 9; memset(buf, 0, sizeof buf); } while (dir->file.sectornum < (int)fat_bpb->bpb_secperclus); } else { /* add a new sector/cluster for last entry */ memset(buf, 0, sizeof buf); do { rc = fat_readwrite(&dir->file, 1, buf, true); if (rc < 1) return rc * 10 - 9; /* Same error code as above, can't be more than -9 */ } while (dir->file.sectornum < (int)fat_bpb->bpb_secperclus); } } return 0; } unsigned char char2dos(unsigned char c) { switch(c) { case 0xe5: /* Special kanji character */ c = 0x05; break; case 0x20: case 0x22: case 0x2a: case 0x2b: case 0x2c: case 0x2e: case 0x3a: case 0x3b: case 0x3c: case 0x3d: case 0x3e: case 0x3f: case 0x5b: case 0x5c: case 0x5d: case 0x7c: /* Illegal name */ c = 0; break; default: if(c < 0x20) { /* Illegal name */ c = 0; } break; } return c; } static int create_dos_name(const unsigned char *name, unsigned char *newname) { int i,j; /* Name part */ for (i=0, j=0; name[i] && (j < 8); i++) { unsigned char c = char2dos(name[i]); if (c) newname[j++] = toupper(c); } while (j < 8) newname[j++] = ' '; /* Extension part */ snprintf(newname+8, 4, "%03X", (unsigned)rand() & 0xfff); return 0; } static int update_short_entry( struct fat_file* file, long size, int attr ) { unsigned char buf[SECTOR_SIZE]; int sector = file->direntry / DIR_ENTRIES_PER_SECTOR; unsigned char* entry = buf + DIR_ENTRY_SIZE * (file->direntry % DIR_ENTRIES_PER_SECTOR); unsigned long* sizeptr; unsigned short* clusptr; struct fat_file dir; int rc; LDEBUGF("update_file_size(cluster:%lx entry:%d size:%ld)\n", file->firstcluster, file->direntry, size); /* create a temporary file handle for the dir holding this file */ rc = fat_open(IF_MV2(file->volume,) file->dircluster, &dir, NULL); if (rc < 0) return rc * 10 - 1; rc = fat_seek( &dir, sector ); if (rc<0) return rc * 10 - 2; rc = fat_readwrite(&dir, 1, buf, false); if (rc < 1) return rc * 10 - 3; if (!entry[0] || entry[0] == 0xe5) panicf("Updating size on empty dir entry %d\n", file->direntry); entry[FATDIR_ATTR] = attr & 0xFF; clusptr = (short*)(entry + FATDIR_FSTCLUSHI); *clusptr = SWAB16(file->firstcluster >> 16); clusptr = (short*)(entry + FATDIR_FSTCLUSLO); *clusptr = SWAB16(file->firstcluster & 0xffff); sizeptr = (long*)(entry + FATDIR_FILESIZE); *sizeptr = SWAB32(size); { #ifdef HAVE_RTC unsigned short time = 0; unsigned short date = 0; #else /* get old time to increment from */ unsigned short time = SWAB16(*(unsigned short*)(entry + FATDIR_WRTTIME)); unsigned short date = SWAB16(*(unsigned short*)(entry + FATDIR_WRTDATE)); #endif fat_time(&date, &time, NULL); *(unsigned short*)(entry + FATDIR_WRTTIME) = SWAB16(time); *(unsigned short*)(entry + FATDIR_WRTDATE) = SWAB16(date); *(unsigned short*)(entry + FATDIR_LSTACCDATE) = SWAB16(date); } rc = fat_seek( &dir, sector ); if (rc < 0) return rc * 10 - 4; rc = fat_readwrite(&dir, 1, buf, true); if (rc < 1) return rc * 10 - 5; return 0; } static int parse_direntry(struct fat_direntry *de, const unsigned char *buf) { int i=0,j=0; memset(de, 0, sizeof(struct fat_direntry)); de->attr = buf[FATDIR_ATTR]; de->crttimetenth = buf[FATDIR_CRTTIMETENTH]; de->crtdate = BYTES2INT16(buf,FATDIR_CRTDATE); de->crttime = BYTES2INT16(buf,FATDIR_CRTTIME); de->wrtdate = BYTES2INT16(buf,FATDIR_WRTDATE); de->wrttime = BYTES2INT16(buf,FATDIR_WRTTIME); de->filesize = BYTES2INT32(buf,FATDIR_FILESIZE); de->firstcluster = ((long)BYTES2INT16(buf,FATDIR_FSTCLUSLO)) | ((long)BYTES2INT16(buf,FATDIR_FSTCLUSHI) << 16); /* fix the name */ for (i=0; (i<8) && (buf[FATDIR_NAME+i] != ' '); i++) de->name[j++] = buf[FATDIR_NAME+i]; if ( buf[FATDIR_NAME+8] != ' ' ) { de->name[j++] = '.'; for (i=8; (i<11) && (buf[FATDIR_NAME+i] != ' '); i++) de->name[j++] = buf[FATDIR_NAME+i]; } return 1; } int fat_open(IF_MV2(int volume,) long startcluster, struct fat_file *file, const struct fat_dir* dir) { file->firstcluster = startcluster; file->lastcluster = startcluster; file->lastsector = 0; file->clusternum = 0; file->sectornum = 0; file->eof = false; #ifdef HAVE_MULTIVOLUME file->volume = volume; /* fixme: remove error check when done */ if (volume >= NUM_VOLUMES || !fat_bpbs[volume].mounted) { LDEBUGF("fat_open() illegal volume %d\n", volume); return -1; } #endif /* remember where the file's dir entry is located */ if ( dir ) { file->direntry = dir->entry - 1; file->direntries = dir->entrycount; file->dircluster = dir->file.firstcluster; } LDEBUGF("fat_open(%lx), entry %d\n",startcluster,file->direntry); return 0; } int fat_create_file(const char* name, struct fat_file* file, struct fat_dir* dir) { int rc; LDEBUGF("fat_create_file(\"%s\",%lx,%lx)\n",name,(long)file,(long)dir); rc = add_dir_entry(dir, file, name, false, false); if (!rc) { file->firstcluster = 0; file->lastcluster = 0; file->lastsector = 0; file->clusternum = 0; file->sectornum = 0; file->eof = false; } return rc; } int fat_create_dir(const char* name, struct fat_dir* newdir, struct fat_dir* dir) { #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[dir->file.volume]; #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif unsigned char buf[SECTOR_SIZE]; int i; int sector; int rc; struct fat_file dummyfile; LDEBUGF("fat_create_dir(\"%s\",%lx,%lx)\n",name,(long)newdir,(long)dir); memset(newdir, 0, sizeof(struct fat_dir)); memset(&dummyfile, 0, sizeof(struct fat_file)); /* First, add the entry in the parent directory */ rc = add_dir_entry(dir, &newdir->file, name, true, false); if (rc < 0) return rc * 10 - 1; /* Allocate a new cluster for the directory */ newdir->file.firstcluster = find_free_cluster(IF_MV2(fat_bpb,) fat_bpb->fsinfo.nextfree); if(newdir->file.firstcluster == 0) return -1; update_fat_entry(IF_MV2(fat_bpb,) newdir->file.firstcluster, FAT_EOF_MARK); /* Clear the entire cluster */ memset(buf, 0, sizeof buf); sector = cluster2sec(IF_MV2(fat_bpb,) newdir->file.firstcluster); for(i = 0;i < (int)fat_bpb->bpb_secperclus;i++) { rc = transfer(IF_MV2(fat_bpb,) sector + i, 1, buf, true ); if (rc < 0) return rc * 10 - 2; } /* Then add the "." entry */ rc = add_dir_entry(newdir, &dummyfile, ".", true, true); if (rc < 0) return rc * 10 - 3; dummyfile.firstcluster = newdir->file.firstcluster; update_short_entry(&dummyfile, 0, FAT_ATTR_DIRECTORY); /* and the ".." entry */ rc = add_dir_entry(newdir, &dummyfile, "..", true, true); if (rc < 0) return rc * 10 - 4; /* The root cluster is cluster 0 in the ".." entry */ if(dir->file.firstcluster == fat_bpb->bpb_rootclus) dummyfile.firstcluster = 0; else dummyfile.firstcluster = dir->file.firstcluster; update_short_entry(&dummyfile, 0, FAT_ATTR_DIRECTORY); /* Set the firstcluster field in the direntry */ update_short_entry(&newdir->file, 0, FAT_ATTR_DIRECTORY); rc = flush_fat(IF_MV(fat_bpb)); if (rc < 0) return rc * 10 - 5; return rc; } int fat_truncate(const struct fat_file *file) { /* truncate trailing clusters */ long next; long last = file->lastcluster; #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #endif LDEBUGF("fat_truncate(%lx, %lx)\n", file->firstcluster, last); for ( last = get_next_cluster(IF_MV2(fat_bpb,) last); last; last = next ) { next = get_next_cluster(IF_MV2(fat_bpb,) last); update_fat_entry(IF_MV2(fat_bpb,) last,0); } if (file->lastcluster) update_fat_entry(IF_MV2(fat_bpb,) file->lastcluster,FAT_EOF_MARK); return 0; } int fat_closewrite(struct fat_file *file, long size, int attr) { int rc; #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #endif LDEBUGF("fat_closewrite(size=%ld)\n",size); if (!size) { /* empty file */ if ( file->firstcluster ) { update_fat_entry(IF_MV2(fat_bpb,) file->firstcluster, 0); file->firstcluster = 0; } } if (file->dircluster) { rc = update_short_entry(file, size, attr); if (rc < 0) return rc * 10 - 1; } flush_fat(IF_MV(fat_bpb)); #ifdef TEST_FAT if ( file->firstcluster ) { /* debug */ #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif long count = 0; long len; long next; for ( next = file->firstcluster; next; next = get_next_cluster(IF_MV2(fat_bpb,) next) ) LDEBUGF("cluster %ld: %lx\n", count++, next); len = count * fat_bpb->bpb_secperclus * SECTOR_SIZE; LDEBUGF("File is %ld clusters (chainlen=%ld, size=%ld)\n", count, len, size ); if ( len > size + fat_bpb->bpb_secperclus * SECTOR_SIZE) panicf("Cluster chain is too long\n"); if ( len < size ) panicf("Cluster chain is too short\n"); } #endif return 0; } static int free_direntries(struct fat_file* file) { unsigned char buf[SECTOR_SIZE]; struct fat_file dir; int numentries = file->direntries; unsigned int entry = file->direntry - numentries + 1; unsigned int sector = entry / DIR_ENTRIES_PER_SECTOR; int i; int rc; /* create a temporary file handle for the dir holding this file */ rc = fat_open(IF_MV2(file->volume,) file->dircluster, &dir, NULL); if (rc < 0) return rc * 10 - 1; rc = fat_seek( &dir, sector ); if (rc < 0) return rc * 10 - 2; rc = fat_readwrite(&dir, 1, buf, false); if (rc < 1) return rc * 10 - 3; for (i=0; i < numentries; i++) { LDEBUGF("Clearing dir entry %d (%d/%d)\n", entry, i+1, numentries); buf[(entry % DIR_ENTRIES_PER_SECTOR) * DIR_ENTRY_SIZE] = 0xe5; entry++; if ( (entry % DIR_ENTRIES_PER_SECTOR) == 0 ) { /* flush this sector */ rc = fat_seek(&dir, sector); if (rc < 0) return rc * 10 - 4; rc = fat_readwrite(&dir, 1, buf, true); if (rc < 1) return rc * 10 - 5; if ( i+1 < numentries ) { /* read next sector */ rc = fat_readwrite(&dir, 1, buf, false); if (rc < 1) return rc * 10 - 6; } sector++; } } if ( entry % DIR_ENTRIES_PER_SECTOR ) { /* flush this sector */ rc = fat_seek(&dir, sector); if (rc < 0) return rc * 10 - 7; rc = fat_readwrite(&dir, 1, buf, true); if (rc < 1) return rc * 10 - 8; } return 0; } int fat_remove(struct fat_file* file) { long next, last = file->firstcluster; int rc; #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #endif LDEBUGF("fat_remove(%lx)\n",last); while ( last ) { next = get_next_cluster(IF_MV2(fat_bpb,) last); update_fat_entry(IF_MV2(fat_bpb,) last,0); last = next; } if ( file->dircluster ) { rc = free_direntries(file); if (rc < 0) return rc * 10 - 1; } file->firstcluster = 0; file->dircluster = 0; rc = flush_fat(IF_MV(fat_bpb)); if (rc < 0) return rc * 10 - 2; return 0; } int fat_rename(struct fat_file* file, struct fat_dir* dir, const unsigned char* newname, long size, int attr) { int rc; struct fat_dir olddir; struct fat_file newfile = *file; #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; if (file->volume != dir->file.volume) { DEBUGF("No rename across volumes!\n"); return -1; } #endif if ( !file->dircluster ) { DEBUGF("File has no dir cluster!\n"); return -2; } /* create a temporary file handle */ rc = fat_opendir(IF_MV2(file->volume,) &olddir, file->dircluster, NULL); if (rc < 0) return rc * 10 - 3; /* create new name */ rc = add_dir_entry(dir, &newfile, newname, false, false); if (rc < 0) return rc * 10 - 4; /* write size and cluster link */ rc = update_short_entry(&newfile, size, attr); if (rc < 0) return rc * 10 - 5; /* remove old name */ rc = free_direntries(file); if (rc < 0) return rc * 10 - 6; rc = flush_fat(IF_MV(fat_bpb)); if (rc < 0) return rc * 10 - 7; return 0; } static int next_write_cluster(struct fat_file* file, long oldcluster, long* newsector) { #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif long cluster = 0; long sector; LDEBUGF("next_write_cluster(%lx,%lx)\n",file->firstcluster, oldcluster); if (oldcluster) cluster = get_next_cluster(IF_MV2(fat_bpb,) oldcluster); if (!cluster) { if (oldcluster > 0) cluster = find_free_cluster(IF_MV2(fat_bpb,) oldcluster+1); else if (oldcluster == 0) cluster = find_free_cluster(IF_MV2(fat_bpb,) fat_bpb->fsinfo.nextfree); #ifdef HAVE_FAT16SUPPORT else /* negative, pseudo-cluster of the root dir */ return 0; /* impossible to append something to the root */ #endif if (cluster) { if (oldcluster) update_fat_entry(IF_MV2(fat_bpb,) oldcluster, cluster); else file->firstcluster = cluster; update_fat_entry(IF_MV2(fat_bpb,) cluster, FAT_EOF_MARK); } else { #ifdef TEST_FAT if (fat_bpb->fsinfo.freecount>0) panicf("There is free space, but find_free_cluster() " "didn't find it!\n"); #endif DEBUGF("next_write_cluster(): Disk full!\n"); return 0; } } sector = cluster2sec(IF_MV2(fat_bpb,) cluster); if (sector<0) return 0; *newsector = sector; return cluster; } static int transfer(IF_MV2(struct bpb* fat_bpb,) unsigned long start, long count, char* buf, bool write ) { #ifndef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[0]; #endif int rc; LDEBUGF("transfer(s=%lx, c=%lx, %s)\n", start+ fat_bpb->startsector, count, write?"write":"read"); if (write) { unsigned long firstallowed; #ifdef HAVE_FAT16SUPPORT if (fat_bpb->is_fat16) firstallowed = fat_bpb->rootdirsector; else #endif firstallowed = fat_bpb->firstdatasector; if (start < firstallowed) panicf("Write %d before data\n", firstallowed - start); if (start + count > fat_bpb->totalsectors) panicf("Write %d after data\n", start + count - fat_bpb->totalsectors); rc = ata_write_sectors(IF_MV2(fat_bpb->drive,) start + fat_bpb->startsector, count, buf); } else rc = ata_read_sectors(IF_MV2(fat_bpb->drive,) start + fat_bpb->startsector, count, buf); if (rc < 0) { DEBUGF( "transfer() - Couldn't %s sector %lx" " (error code %d)\n", write ? "write":"read", start, rc); return rc; } return 0; } int fat_readwrite( struct fat_file *file, long sectorcount, void* buf, bool write ) { #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif long cluster = file->lastcluster; long sector = file->lastsector; long clusternum = file->clusternum; long numsec = file->sectornum; bool eof = file->eof; long first=0, last=0; long i; int rc; LDEBUGF( "fat_readwrite(file:%lx,count:0x%lx,buf:%lx,%s)\n", file->firstcluster,sectorcount,(long)buf,write?"write":"read"); LDEBUGF( "fat_readwrite: sec=%lx numsec=%ld eof=%d\n", sector,numsec, eof?1:0); if ( eof && !write) return 0; /* find sequential sectors and write them all at once */ for (i=0; (i < sectorcount) && (sector > -1); i++ ) { numsec++; if ( numsec > (long)fat_bpb->bpb_secperclus || !cluster ) { long oldcluster = cluster; if (write) cluster = next_write_cluster(file, cluster, §or); else { cluster = get_next_cluster(IF_MV2(fat_bpb,) cluster); sector = cluster2sec(IF_MV2(fat_bpb,) cluster); } clusternum++; numsec=1; if (!cluster) { eof = true; if ( write ) { /* remember last cluster, in case we want to append to the file */ cluster = oldcluster; clusternum--; i = -1; /* Error code */ break; } } else eof = false; } else { if (sector) sector++; else { /* look up first sector of file */ sector = cluster2sec(IF_MV2(fat_bpb,) file->firstcluster); numsec=1; #ifdef HAVE_FAT16SUPPORT if (file->firstcluster < 0) { /* FAT16 root dir */ sector += fat_bpb->rootdiroffset; numsec += fat_bpb->rootdiroffset; } #endif } } if (!first) first = sector; if ( ((sector != first) && (sector != last+1)) || /* not sequential */ (last-first+1 == 256) ) { /* max 256 sectors per ata request */ long count = last - first + 1; rc = transfer(IF_MV2(fat_bpb,) first, count, buf, write ); if (rc < 0) return rc * 10 - 1; buf = (char *)buf + count * SECTOR_SIZE; first = sector; } if ((i == sectorcount-1) && /* last sector requested */ (!eof)) { long count = sector - first + 1; rc = transfer(IF_MV2(fat_bpb,) first, count, buf, write ); if (rc < 0) return rc * 10 - 2; } last = sector; } file->lastcluster = cluster; file->lastsector = sector; file->clusternum = clusternum; file->sectornum = numsec; file->eof = eof; /* if eof, don't report last block as read/written */ if (eof) i--; DEBUGF("Sectors written: %ld\n", i); return i; } int fat_seek(struct fat_file *file, unsigned long seeksector ) { #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[file->volume]; #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif long clusternum=0, numclusters=0, sectornum=0, sector=0; long cluster = file->firstcluster; long i; #ifdef HAVE_FAT16SUPPORT if (cluster < 0) /* FAT16 root dir */ seeksector += fat_bpb->rootdiroffset; #endif file->eof = false; if (seeksector) { /* we need to find the sector BEFORE the requested, since the file struct stores the last accessed sector */ seeksector--; numclusters = clusternum = seeksector / fat_bpb->bpb_secperclus; sectornum = seeksector % fat_bpb->bpb_secperclus; if (file->clusternum && clusternum >= file->clusternum) { cluster = file->lastcluster; numclusters -= file->clusternum; } for (i=0; ifirstcluster, seeksector, cluster, sector, sectornum); file->lastcluster = cluster; file->lastsector = sector; file->clusternum = clusternum; file->sectornum = sectornum + 1; return 0; } int fat_opendir(IF_MV2(int volume,) struct fat_dir *dir, unsigned long startcluster, const struct fat_dir *parent_dir) { #ifdef HAVE_MULTIVOLUME struct bpb* fat_bpb = &fat_bpbs[volume]; /* fixme: remove error check when done */ if (volume >= NUM_VOLUMES || !fat_bpbs[volume].mounted) { LDEBUGF("fat_open() illegal volume %d\n", volume); return -1; } #else struct bpb* fat_bpb = &fat_bpbs[0]; #endif int rc; dir->entry = 0; dir->sector = 0; if (startcluster == 0) startcluster = fat_bpb->bpb_rootclus; rc = fat_open(IF_MV2(volume,) startcluster, &dir->file, parent_dir); if(rc) { DEBUGF( "fat_opendir() - Couldn't open dir" " (error code %d)\n", rc); return rc * 10 - 1; } return 0; } /* convert from unicode to a single-byte charset */ static void unicode2iso(const unsigned char* unicode, unsigned char* iso, int count) { int i; for (i=0; isectorcache[0]; dir->entrycount = 0; while(!done) { if ( !(dir->entry % DIR_ENTRIES_PER_SECTOR) || !dir->sector ) { rc = fat_readwrite(&dir->file, 1, cached_buf, false); if (rc == 0) { /* eof */ entry->name[0] = 0; break; } if (rc < 0) { DEBUGF( "fat_getnext() - Couldn't read dir" " (error code %d)\n", rc); return rc * 10 - 1; } dir->sector = dir->file.lastsector; } for (i = dir->entry % DIR_ENTRIES_PER_SECTOR; i < DIR_ENTRIES_PER_SECTOR; i++) { unsigned int entrypos = i * DIR_ENTRY_SIZE; firstbyte = cached_buf[entrypos]; dir->entry++; if (firstbyte == 0xe5) { /* free entry */ sectoridx = 0; dir->entrycount = 0; continue; } if (firstbyte == 0) { /* last entry */ entry->name[0] = 0; dir->entrycount = 0; return 0; } dir->entrycount++; /* longname entry? */ if ( ( cached_buf[entrypos + FATDIR_ATTR] & FAT_ATTR_LONG_NAME_MASK ) == FAT_ATTR_LONG_NAME ) { longarray[longs++] = entrypos + sectoridx; } else { if ( parse_direntry(entry, &cached_buf[entrypos]) ) { /* don't return volume id entry */ if ( entry->attr == FAT_ATTR_VOLUME_ID ) continue; /* replace shortname with longname? */ if ( longs ) { int j,l=0; /* iterate backwards through the dir entries */ for (j=longs-1; j>=0; j--) { unsigned char* ptr = cached_buf; int index = longarray[j]; /* current or cached sector? */ if ( sectoridx >= SECTOR_SIZE ) { if ( sectoridx >= SECTOR_SIZE*2 ) { if ( ( index >= SECTOR_SIZE ) && ( index < SECTOR_SIZE*2 )) ptr = dir->sectorcache[1]; else ptr = dir->sectorcache[2]; } else { if ( index < SECTOR_SIZE ) ptr = dir->sectorcache[1]; } index &= SECTOR_SIZE-1; } /* names are stored in unicode, but we only grab the low byte (iso8859-1). */ unicode2iso(ptr + index + 1, entry->name + l, 5); l+= 5; unicode2iso(ptr + index + 14, entry->name + l, 6); l+= 6; unicode2iso(ptr + index + 28, entry->name + l, 2); l+= 2; } entry->name[l]=0; } done = true; sectoridx = 0; i++; break; } } } /* save this sector, for longname use */ if ( sectoridx ) memcpy( dir->sectorcache[2], dir->sectorcache[0], SECTOR_SIZE ); else memcpy( dir->sectorcache[1], dir->sectorcache[0], SECTOR_SIZE ); sectoridx += SECTOR_SIZE; } return 0; } int fat_get_cluster_size(IF_MV_NONVOID(int volume)) { #ifndef HAVE_MULTIVOLUME const int volume = 0; #endif struct bpb* fat_bpb = &fat_bpbs[volume]; return fat_bpb->bpb_secperclus * SECTOR_SIZE; } #ifdef HAVE_MULTIVOLUME bool fat_ismounted(int volume) { return (volume