bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1 | /* vim:set shiftwidth=4 ts=8: */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2 | /* |
| 3 | * QEMU Block driver for virtual VFAT (shadows a local directory) |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4 | * |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 5 | * Copyright (c) 2004,2005 Johannes E. Schindelin |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 6 | * |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 8 | * of this software and associated documentation files (the "Software"), to deal |
| 9 | * in the Software without restriction, including without limitation the rights |
| 10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 11 | * copies of the Software, and to permit persons to whom the Software is |
| 12 | * furnished to do so, subject to the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be included in |
| 15 | * all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 23 | * THE SOFTWARE. |
| 24 | */ |
| 25 | #include <sys/stat.h> |
| 26 | #include <dirent.h> |
| 27 | #include <assert.h> |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 28 | #include "qemu-common.h" |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 29 | #include "block_int.h" |
| 30 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 31 | #ifndef S_IWGRP |
| 32 | #define S_IWGRP 0 |
| 33 | #endif |
| 34 | #ifndef S_IWOTH |
| 35 | #define S_IWOTH 0 |
| 36 | #endif |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 37 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 38 | /* TODO: add ":bootsector=blabla.img:" */ |
| 39 | /* LATER TODO: add automatic boot sector generation from |
| 40 | BOOTEASY.ASM and Ranish Partition Manager |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 41 | Note that DOS assumes the system files to be the first files in the |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 42 | file system (test if the boot sector still relies on that fact)! */ |
| 43 | /* MAYBE TODO: write block-visofs.c */ |
| 44 | /* TODO: call try_commit() only after a timeout */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 45 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 46 | /* #define DEBUG */ |
| 47 | |
| 48 | #ifdef DEBUG |
| 49 | |
| 50 | #define DLOG(a) a |
| 51 | |
| 52 | #undef stderr |
| 53 | #define stderr STDERR |
| 54 | FILE* stderr = NULL; |
| 55 | |
| 56 | static void checkpoint(); |
| 57 | |
| 58 | #ifdef __MINGW32__ |
| 59 | void nonono(const char* file, int line, const char* msg) { |
| 60 | fprintf(stderr, "Nonono! %s:%d %s\n", file, line, msg); |
| 61 | exit(-5); |
| 62 | } |
| 63 | #undef assert |
bellard | 6bcb76c | 2006-09-09 12:03:20 +0000 | [diff] [blame] | 64 | #define assert(a) do {if (!(a)) nonono(__FILE__, __LINE__, #a);}while(0) |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 65 | #endif |
| 66 | |
| 67 | #else |
| 68 | |
| 69 | #define DLOG(a) |
| 70 | |
| 71 | #endif |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 72 | |
| 73 | /* dynamic array functions */ |
| 74 | typedef struct array_t { |
| 75 | char* pointer; |
| 76 | unsigned int size,next,item_size; |
| 77 | } array_t; |
| 78 | |
| 79 | static inline void array_init(array_t* array,unsigned int item_size) |
| 80 | { |
| 81 | array->pointer=0; |
| 82 | array->size=0; |
| 83 | array->next=0; |
| 84 | array->item_size=item_size; |
| 85 | } |
| 86 | |
| 87 | static inline void array_free(array_t* array) |
| 88 | { |
| 89 | if(array->pointer) |
| 90 | free(array->pointer); |
| 91 | array->size=array->next=0; |
| 92 | } |
| 93 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 94 | /* does not automatically grow */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 95 | static inline void* array_get(array_t* array,unsigned int index) { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 96 | assert(index >= 0); |
| 97 | assert(index < array->next); |
| 98 | return array->pointer + index * array->item_size; |
| 99 | } |
| 100 | |
| 101 | static inline int array_ensure_allocated(array_t* array, int index) |
| 102 | { |
| 103 | if((index + 1) * array->item_size > array->size) { |
| 104 | int new_size = (index + 32) * array->item_size; |
| 105 | array->pointer = realloc(array->pointer, new_size); |
| 106 | if (!array->pointer) |
| 107 | return -1; |
| 108 | array->size = new_size; |
| 109 | array->next = index + 1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 110 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 111 | |
| 112 | return 0; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | static inline void* array_get_next(array_t* array) { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 116 | unsigned int next = array->next; |
| 117 | void* result; |
| 118 | |
| 119 | if (array_ensure_allocated(array, next) < 0) |
| 120 | return NULL; |
| 121 | |
| 122 | array->next = next + 1; |
| 123 | result = array_get(array, next); |
| 124 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 125 | return result; |
| 126 | } |
| 127 | |
| 128 | static inline void* array_insert(array_t* array,unsigned int index,unsigned int count) { |
| 129 | if((array->next+count)*array->item_size>array->size) { |
| 130 | int increment=count*array->item_size; |
| 131 | array->pointer=realloc(array->pointer,array->size+increment); |
| 132 | if(!array->pointer) |
| 133 | return 0; |
| 134 | array->size+=increment; |
| 135 | } |
| 136 | memmove(array->pointer+(index+count)*array->item_size, |
| 137 | array->pointer+index*array->item_size, |
| 138 | (array->next-index)*array->item_size); |
| 139 | array->next+=count; |
| 140 | return array->pointer+index*array->item_size; |
| 141 | } |
| 142 | |
| 143 | /* this performs a "roll", so that the element which was at index_from becomes |
| 144 | * index_to, but the order of all other elements is preserved. */ |
| 145 | static inline int array_roll(array_t* array,int index_to,int index_from,int count) |
| 146 | { |
| 147 | char* buf; |
| 148 | char* from; |
| 149 | char* to; |
| 150 | int is; |
| 151 | |
| 152 | if(!array || |
| 153 | index_to<0 || index_to>=array->next || |
| 154 | index_from<0 || index_from>=array->next) |
| 155 | return -1; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 156 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 157 | if(index_to==index_from) |
| 158 | return 0; |
| 159 | |
| 160 | is=array->item_size; |
| 161 | from=array->pointer+index_from*is; |
| 162 | to=array->pointer+index_to*is; |
| 163 | buf=malloc(is*count); |
| 164 | memcpy(buf,from,is*count); |
| 165 | |
| 166 | if(index_to<index_from) |
| 167 | memmove(to+is*count,to,from-to); |
| 168 | else |
| 169 | memmove(from,from+is*count,to-from); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 170 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 171 | memcpy(to,buf,is*count); |
| 172 | |
| 173 | free(buf); |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 178 | inline int array_remove_slice(array_t* array,int index, int count) |
| 179 | { |
| 180 | assert(index >=0); |
| 181 | assert(count > 0); |
| 182 | assert(index + count <= array->next); |
| 183 | if(array_roll(array,array->next-1,index,count)) |
| 184 | return -1; |
| 185 | array->next -= count; |
| 186 | return 0; |
| 187 | } |
| 188 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 189 | int array_remove(array_t* array,int index) |
| 190 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 191 | return array_remove_slice(array, index, 1); |
| 192 | } |
| 193 | |
| 194 | /* return the index for a given member */ |
| 195 | int array_index(array_t* array, void* pointer) |
| 196 | { |
| 197 | size_t offset = (char*)pointer - array->pointer; |
| 198 | assert(offset >= 0); |
| 199 | assert((offset % array->item_size) == 0); |
| 200 | assert(offset/array->item_size < array->next); |
| 201 | return offset/array->item_size; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | /* These structures are used to fake a disk and the VFAT filesystem. |
| 205 | * For this reason we need to use __attribute__((packed)). */ |
| 206 | |
| 207 | typedef struct bootsector_t { |
| 208 | uint8_t jump[3]; |
| 209 | uint8_t name[8]; |
| 210 | uint16_t sector_size; |
| 211 | uint8_t sectors_per_cluster; |
| 212 | uint16_t reserved_sectors; |
| 213 | uint8_t number_of_fats; |
| 214 | uint16_t root_entries; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 215 | uint16_t total_sectors16; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 216 | uint8_t media_type; |
| 217 | uint16_t sectors_per_fat; |
| 218 | uint16_t sectors_per_track; |
| 219 | uint16_t number_of_heads; |
| 220 | uint32_t hidden_sectors; |
| 221 | uint32_t total_sectors; |
| 222 | union { |
| 223 | struct { |
| 224 | uint8_t drive_number; |
| 225 | uint8_t current_head; |
| 226 | uint8_t signature; |
| 227 | uint32_t id; |
| 228 | uint8_t volume_label[11]; |
| 229 | } __attribute__((packed)) fat16; |
| 230 | struct { |
| 231 | uint32_t sectors_per_fat; |
| 232 | uint16_t flags; |
| 233 | uint8_t major,minor; |
| 234 | uint32_t first_cluster_of_root_directory; |
| 235 | uint16_t info_sector; |
| 236 | uint16_t backup_boot_sector; |
| 237 | uint16_t ignored; |
| 238 | } __attribute__((packed)) fat32; |
| 239 | } u; |
| 240 | uint8_t fat_type[8]; |
| 241 | uint8_t ignored[0x1c0]; |
| 242 | uint8_t magic[2]; |
| 243 | } __attribute__((packed)) bootsector_t; |
| 244 | |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 245 | typedef struct { |
| 246 | uint8_t head; |
| 247 | uint8_t sector; |
| 248 | uint8_t cylinder; |
| 249 | } mbr_chs_t; |
| 250 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 251 | typedef struct partition_t { |
| 252 | uint8_t attributes; /* 0x80 = bootable */ |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 253 | mbr_chs_t start_CHS; |
| 254 | uint8_t fs_type; /* 0x1 = FAT12, 0x6 = FAT16, 0xe = FAT16_LBA, 0xb = FAT32, 0xc = FAT32_LBA */ |
| 255 | mbr_chs_t end_CHS; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 256 | uint32_t start_sector_long; |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 257 | uint32_t length_sector_long; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 258 | } __attribute__((packed)) partition_t; |
| 259 | |
| 260 | typedef struct mbr_t { |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 261 | uint8_t ignored[0x1b8]; |
| 262 | uint32_t nt_id; |
| 263 | uint8_t ignored2[2]; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 264 | partition_t partition[4]; |
| 265 | uint8_t magic[2]; |
| 266 | } __attribute__((packed)) mbr_t; |
| 267 | |
| 268 | typedef struct direntry_t { |
| 269 | uint8_t name[8]; |
| 270 | uint8_t extension[3]; |
| 271 | uint8_t attributes; |
| 272 | uint8_t reserved[2]; |
| 273 | uint16_t ctime; |
| 274 | uint16_t cdate; |
| 275 | uint16_t adate; |
| 276 | uint16_t begin_hi; |
| 277 | uint16_t mtime; |
| 278 | uint16_t mdate; |
| 279 | uint16_t begin; |
| 280 | uint32_t size; |
| 281 | } __attribute__((packed)) direntry_t; |
| 282 | |
| 283 | /* this structure are used to transparently access the files */ |
| 284 | |
| 285 | typedef struct mapping_t { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 286 | /* begin is the first cluster, end is the last+1 */ |
| 287 | uint32_t begin,end; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 288 | /* as s->directory is growable, no pointer may be used here */ |
| 289 | unsigned int dir_index; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 290 | /* the clusters of a file may be in any order; this points to the first */ |
| 291 | int first_mapping_index; |
| 292 | union { |
| 293 | /* offset is |
| 294 | * - the offset in the file (in clusters) for a file, or |
| 295 | * - the next cluster of the directory for a directory, and |
| 296 | * - the address of the buffer for a faked entry |
| 297 | */ |
| 298 | struct { |
| 299 | uint32_t offset; |
| 300 | } file; |
| 301 | struct { |
| 302 | int parent_mapping_index; |
| 303 | int first_dir_index; |
| 304 | } dir; |
| 305 | } info; |
| 306 | /* path contains the full path, i.e. it always starts with s->path */ |
| 307 | char* path; |
| 308 | |
| 309 | enum { MODE_UNDEFINED = 0, MODE_NORMAL = 1, MODE_MODIFIED = 2, |
| 310 | MODE_DIRECTORY = 4, MODE_FAKED = 8, |
| 311 | MODE_DELETED = 16, MODE_RENAMED = 32 } mode; |
| 312 | int read_only; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 313 | } mapping_t; |
| 314 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 315 | #ifdef DEBUG |
| 316 | static void print_direntry(const struct direntry_t*); |
| 317 | static void print_mapping(const struct mapping_t* mapping); |
| 318 | #endif |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 319 | |
| 320 | /* here begins the real VVFAT driver */ |
| 321 | |
| 322 | typedef struct BDRVVVFATState { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 323 | BlockDriverState* bs; /* pointer to parent */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 324 | unsigned int first_sectors_number; /* 1 for a single partition, 0x40 for a disk with partition table */ |
| 325 | unsigned char first_sectors[0x40*0x200]; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 326 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 327 | int fat_type; /* 16 or 32 */ |
| 328 | array_t fat,directory,mapping; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 329 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 330 | unsigned int cluster_size; |
| 331 | unsigned int sectors_per_cluster; |
| 332 | unsigned int sectors_per_fat; |
| 333 | unsigned int sectors_of_root_directory; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 334 | uint32_t last_cluster_of_root_directory; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 335 | unsigned int faked_sectors; /* how many sectors are faked before file data */ |
| 336 | uint32_t sector_count; /* total number of sectors of the partition */ |
| 337 | uint32_t cluster_count; /* total number of clusters of this partition */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 338 | uint32_t max_fat_value; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 339 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 340 | int current_fd; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 341 | mapping_t* current_mapping; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 342 | unsigned char* cluster; /* points to current cluster */ |
| 343 | unsigned char* cluster_buffer; /* points to a buffer to hold temp data */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 344 | unsigned int current_cluster; |
| 345 | |
| 346 | /* write support */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 347 | BlockDriverState* write_target; |
| 348 | char* qcow_filename; |
| 349 | BlockDriverState* qcow; |
| 350 | void* fat2; |
| 351 | char* used_clusters; |
| 352 | array_t commits; |
| 353 | const char* path; |
| 354 | int downcase_short_names; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 355 | } BDRVVVFATState; |
| 356 | |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 357 | /* take the sector position spos and convert it to Cylinder/Head/Sector position |
| 358 | * if the position is outside the specified geometry, fill maximum value for CHS |
| 359 | * and return 1 to signal overflow. |
| 360 | */ |
| 361 | static int sector2CHS(BlockDriverState* bs, mbr_chs_t * chs, int spos){ |
| 362 | int head,sector; |
| 363 | sector = spos % (bs->secs); spos/= bs->secs; |
| 364 | head = spos % (bs->heads); spos/= bs->heads; |
| 365 | if(spos >= bs->cyls){ |
| 366 | /* Overflow, |
| 367 | it happens if 32bit sector positions are used, while CHS is only 24bit. |
| 368 | Windows/Dos is said to take 1023/255/63 as nonrepresentable CHS */ |
| 369 | chs->head = 0xFF; |
| 370 | chs->sector = 0xFF; |
| 371 | chs->cylinder = 0xFF; |
| 372 | return 1; |
| 373 | } |
| 374 | chs->head = (uint8_t)head; |
| 375 | chs->sector = (uint8_t)( (sector+1) | ((spos>>8)<<6) ); |
| 376 | chs->cylinder = (uint8_t)spos; |
| 377 | return 0; |
| 378 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 379 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 380 | static void init_mbr(BDRVVVFATState* s) |
| 381 | { |
| 382 | /* TODO: if the files mbr.img and bootsect.img exist, use them */ |
| 383 | mbr_t* real_mbr=(mbr_t*)s->first_sectors; |
| 384 | partition_t* partition=&(real_mbr->partition[0]); |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 385 | int lba; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 386 | |
| 387 | memset(s->first_sectors,0,512); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 388 | |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 389 | /* Win NT Disk Signature */ |
| 390 | real_mbr->nt_id= cpu_to_le32(0xbe1afdfa); |
| 391 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 392 | partition->attributes=0x80; /* bootable */ |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 393 | |
| 394 | /* LBA is used when partition is outside the CHS geometry */ |
| 395 | lba = sector2CHS(s->bs, &partition->start_CHS, s->first_sectors_number-1); |
| 396 | lba|= sector2CHS(s->bs, &partition->end_CHS, s->sector_count); |
| 397 | |
| 398 | /*LBA partitions are identified only by start/length_sector_long not by CHS*/ |
| 399 | partition->start_sector_long =cpu_to_le32(s->first_sectors_number-1); |
| 400 | partition->length_sector_long=cpu_to_le32(s->sector_count - s->first_sectors_number+1); |
| 401 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 402 | /* FAT12/FAT16/FAT32 */ |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 403 | /* DOS uses different types when partition is LBA, |
| 404 | probably to prevent older versions from using CHS on them */ |
| 405 | partition->fs_type= s->fat_type==12 ? 0x1: |
| 406 | s->fat_type==16 ? (lba?0xe:0x06): |
| 407 | /*fat_tyoe==32*/ (lba?0xc:0x0b); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 408 | |
| 409 | real_mbr->magic[0]=0x55; real_mbr->magic[1]=0xaa; |
| 410 | } |
| 411 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 412 | /* direntry functions */ |
| 413 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 414 | /* dest is assumed to hold 258 bytes, and pads with 0xffff up to next multiple of 26 */ |
| 415 | static inline int short2long_name(unsigned char* dest,const char* src) |
| 416 | { |
| 417 | int i; |
| 418 | for(i=0;i<129 && src[i];i++) { |
| 419 | dest[2*i]=src[i]; |
| 420 | dest[2*i+1]=0; |
| 421 | } |
| 422 | dest[2*i]=dest[2*i+1]=0; |
| 423 | for(i=2*i+2;(i%26);i++) |
| 424 | dest[i]=0xff; |
| 425 | return i; |
| 426 | } |
| 427 | |
| 428 | static inline direntry_t* create_long_filename(BDRVVVFATState* s,const char* filename) |
| 429 | { |
| 430 | char buffer[258]; |
| 431 | int length=short2long_name(buffer,filename), |
| 432 | number_of_entries=(length+25)/26,i; |
| 433 | direntry_t* entry; |
| 434 | |
| 435 | for(i=0;i<number_of_entries;i++) { |
| 436 | entry=array_get_next(&(s->directory)); |
| 437 | entry->attributes=0xf; |
| 438 | entry->reserved[0]=0; |
| 439 | entry->begin=0; |
| 440 | entry->name[0]=(number_of_entries-i)|(i==0?0x40:0); |
| 441 | } |
| 442 | for(i=0;i<length;i++) { |
| 443 | int offset=(i%26); |
| 444 | if(offset<10) offset=1+offset; |
| 445 | else if(offset<22) offset=14+offset-10; |
| 446 | else offset=28+offset-22; |
| 447 | entry=array_get(&(s->directory),s->directory.next-1-(i/26)); |
| 448 | entry->name[offset]=buffer[i]; |
| 449 | } |
| 450 | return array_get(&(s->directory),s->directory.next-number_of_entries); |
| 451 | } |
| 452 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 453 | static char is_free(const direntry_t* direntry) |
| 454 | { |
| 455 | /* return direntry->name[0]==0 ; */ |
| 456 | return direntry->attributes == 0 || direntry->name[0]==0xe5; |
| 457 | } |
| 458 | |
| 459 | static char is_volume_label(const direntry_t* direntry) |
| 460 | { |
| 461 | return direntry->attributes == 0x28; |
| 462 | } |
| 463 | |
| 464 | static char is_long_name(const direntry_t* direntry) |
| 465 | { |
| 466 | return direntry->attributes == 0xf; |
| 467 | } |
| 468 | |
| 469 | static char is_short_name(const direntry_t* direntry) |
| 470 | { |
| 471 | return !is_volume_label(direntry) && !is_long_name(direntry) |
| 472 | && !is_free(direntry); |
| 473 | } |
| 474 | |
| 475 | static char is_directory(const direntry_t* direntry) |
| 476 | { |
| 477 | return direntry->attributes & 0x10 && direntry->name[0] != 0xe5; |
| 478 | } |
| 479 | |
| 480 | static inline char is_dot(const direntry_t* direntry) |
| 481 | { |
| 482 | return is_short_name(direntry) && direntry->name[0] == '.'; |
| 483 | } |
| 484 | |
| 485 | static char is_file(const direntry_t* direntry) |
| 486 | { |
| 487 | return is_short_name(direntry) && !is_directory(direntry); |
| 488 | } |
| 489 | |
| 490 | static inline uint32_t begin_of_direntry(const direntry_t* direntry) |
| 491 | { |
| 492 | return le16_to_cpu(direntry->begin)|(le16_to_cpu(direntry->begin_hi)<<16); |
| 493 | } |
| 494 | |
| 495 | static inline uint32_t filesize_of_direntry(const direntry_t* direntry) |
| 496 | { |
| 497 | return le32_to_cpu(direntry->size); |
| 498 | } |
| 499 | |
| 500 | static void set_begin_of_direntry(direntry_t* direntry, uint32_t begin) |
| 501 | { |
| 502 | direntry->begin = cpu_to_le16(begin & 0xffff); |
| 503 | direntry->begin_hi = cpu_to_le16((begin >> 16) & 0xffff); |
| 504 | } |
| 505 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 506 | /* fat functions */ |
| 507 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 508 | static inline uint8_t fat_chksum(const direntry_t* entry) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 509 | { |
| 510 | uint8_t chksum=0; |
| 511 | int i; |
| 512 | |
| 513 | for(i=0;i<11;i++) |
| 514 | chksum=(((chksum&0xfe)>>1)|((chksum&0x01)?0x80:0)) |
| 515 | +(unsigned char)entry->name[i]; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 516 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 517 | return chksum; |
| 518 | } |
| 519 | |
| 520 | /* if return_time==0, this returns the fat_date, else the fat_time */ |
| 521 | static uint16_t fat_datetime(time_t time,int return_time) { |
| 522 | struct tm* t; |
| 523 | #ifdef _WIN32 |
| 524 | t=localtime(&time); /* this is not thread safe */ |
| 525 | #else |
| 526 | struct tm t1; |
| 527 | t=&t1; |
| 528 | localtime_r(&time,t); |
| 529 | #endif |
| 530 | if(return_time) |
| 531 | return cpu_to_le16((t->tm_sec/2)|(t->tm_min<<5)|(t->tm_hour<<11)); |
| 532 | return cpu_to_le16((t->tm_mday)|((t->tm_mon+1)<<5)|((t->tm_year-80)<<9)); |
| 533 | } |
| 534 | |
| 535 | static inline void fat_set(BDRVVVFATState* s,unsigned int cluster,uint32_t value) |
| 536 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 537 | if(s->fat_type==32) { |
| 538 | uint32_t* entry=array_get(&(s->fat),cluster); |
| 539 | *entry=cpu_to_le32(value); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 540 | } else if(s->fat_type==16) { |
| 541 | uint16_t* entry=array_get(&(s->fat),cluster); |
| 542 | *entry=cpu_to_le16(value&0xffff); |
| 543 | } else { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 544 | int offset = (cluster*3/2); |
| 545 | unsigned char* p = array_get(&(s->fat), offset); |
| 546 | switch (cluster&1) { |
| 547 | case 0: |
| 548 | p[0] = value&0xff; |
| 549 | p[1] = (p[1]&0xf0) | ((value>>8)&0xf); |
| 550 | break; |
| 551 | case 1: |
| 552 | p[0] = (p[0]&0xf) | ((value&0xf)<<4); |
| 553 | p[1] = (value>>4); |
| 554 | break; |
| 555 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 556 | } |
| 557 | } |
| 558 | |
| 559 | static inline uint32_t fat_get(BDRVVVFATState* s,unsigned int cluster) |
| 560 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 561 | if(s->fat_type==32) { |
| 562 | uint32_t* entry=array_get(&(s->fat),cluster); |
| 563 | return le32_to_cpu(*entry); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 564 | } else if(s->fat_type==16) { |
| 565 | uint16_t* entry=array_get(&(s->fat),cluster); |
| 566 | return le16_to_cpu(*entry); |
| 567 | } else { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 568 | const uint8_t* x=s->fat.pointer+cluster*3/2; |
| 569 | return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 570 | } |
| 571 | } |
| 572 | |
| 573 | static inline int fat_eof(BDRVVVFATState* s,uint32_t fat_entry) |
| 574 | { |
| 575 | if(fat_entry>s->max_fat_value-8) |
| 576 | return -1; |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | static inline void init_fat(BDRVVVFATState* s) |
| 581 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 582 | if (s->fat_type == 12) { |
| 583 | array_init(&(s->fat),1); |
| 584 | array_ensure_allocated(&(s->fat), |
| 585 | s->sectors_per_fat * 0x200 * 3 / 2 - 1); |
| 586 | } else { |
| 587 | array_init(&(s->fat),(s->fat_type==32?4:2)); |
| 588 | array_ensure_allocated(&(s->fat), |
| 589 | s->sectors_per_fat * 0x200 / s->fat.item_size - 1); |
| 590 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 591 | memset(s->fat.pointer,0,s->fat.size); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 592 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 593 | switch(s->fat_type) { |
| 594 | case 12: s->max_fat_value=0xfff; break; |
| 595 | case 16: s->max_fat_value=0xffff; break; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 596 | case 32: s->max_fat_value=0x0fffffff; break; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 597 | default: s->max_fat_value=0; /* error... */ |
| 598 | } |
| 599 | |
| 600 | } |
| 601 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 602 | /* TODO: in create_short_filename, 0xe5->0x05 is not yet handled! */ |
| 603 | /* TODO: in parse_short_filename, 0x05->0xe5 is not yet handled! */ |
| 604 | static inline direntry_t* create_short_and_long_name(BDRVVVFATState* s, |
| 605 | unsigned int directory_start, const char* filename, int is_dot) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 606 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 607 | int i,j,long_index=s->directory.next; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 608 | direntry_t* entry=0; |
| 609 | direntry_t* entry_long=0; |
| 610 | |
| 611 | if(is_dot) { |
| 612 | entry=array_get_next(&(s->directory)); |
| 613 | memset(entry->name,0x20,11); |
| 614 | memcpy(entry->name,filename,strlen(filename)); |
| 615 | return entry; |
| 616 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 617 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 618 | entry_long=create_long_filename(s,filename); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 619 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 620 | i = strlen(filename); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 621 | for(j = i - 1; j>0 && filename[j]!='.';j--); |
| 622 | if (j > 0) |
| 623 | i = (j > 8 ? 8 : j); |
| 624 | else if (i > 8) |
| 625 | i = 8; |
| 626 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 627 | entry=array_get_next(&(s->directory)); |
| 628 | memset(entry->name,0x20,11); |
| 629 | strncpy(entry->name,filename,i); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 630 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 631 | if(j > 0) |
| 632 | for (i = 0; i < 3 && filename[j+1+i]; i++) |
| 633 | entry->extension[i] = filename[j+1+i]; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 634 | |
| 635 | /* upcase & remove unwanted characters */ |
| 636 | for(i=10;i>=0;i--) { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 637 | if(i==10 || i==7) for(;i>0 && entry->name[i]==' ';i--); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 638 | if(entry->name[i]<=' ' || entry->name[i]>0x7f |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 639 | || strchr(".*?<>|\":/\\[];,+='",entry->name[i])) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 640 | entry->name[i]='_'; |
| 641 | else if(entry->name[i]>='a' && entry->name[i]<='z') |
| 642 | entry->name[i]+='A'-'a'; |
| 643 | } |
| 644 | |
| 645 | /* mangle duplicates */ |
| 646 | while(1) { |
| 647 | direntry_t* entry1=array_get(&(s->directory),directory_start); |
| 648 | int j; |
| 649 | |
| 650 | for(;entry1<entry;entry1++) |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 651 | if(!is_long_name(entry1) && !memcmp(entry1->name,entry->name,11)) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 652 | break; /* found dupe */ |
| 653 | if(entry1==entry) /* no dupe found */ |
| 654 | break; |
| 655 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 656 | /* use all 8 characters of name */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 657 | if(entry->name[7]==' ') { |
| 658 | int j; |
| 659 | for(j=6;j>0 && entry->name[j]==' ';j--) |
| 660 | entry->name[j]='~'; |
| 661 | } |
| 662 | |
| 663 | /* increment number */ |
| 664 | for(j=7;j>0 && entry->name[j]=='9';j--) |
| 665 | entry->name[j]='0'; |
| 666 | if(j>0) { |
| 667 | if(entry->name[j]<'0' || entry->name[j]>'9') |
| 668 | entry->name[j]='0'; |
| 669 | else |
| 670 | entry->name[j]++; |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /* calculate checksum; propagate to long name */ |
| 675 | if(entry_long) { |
| 676 | uint8_t chksum=fat_chksum(entry); |
| 677 | |
| 678 | /* calculate anew, because realloc could have taken place */ |
| 679 | entry_long=array_get(&(s->directory),long_index); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 680 | while(entry_long<entry && is_long_name(entry_long)) { |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 681 | entry_long->reserved[1]=chksum; |
| 682 | entry_long++; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | return entry; |
| 687 | } |
| 688 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 689 | /* |
| 690 | * Read a directory. (the index of the corresponding mapping must be passed). |
| 691 | */ |
| 692 | static int read_directory(BDRVVVFATState* s, int mapping_index) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 693 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 694 | mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
| 695 | direntry_t* direntry; |
| 696 | const char* dirname = mapping->path; |
| 697 | int first_cluster = mapping->begin; |
| 698 | int parent_index = mapping->info.dir.parent_mapping_index; |
| 699 | mapping_t* parent_mapping = (mapping_t*) |
| 700 | (parent_index >= 0 ? array_get(&(s->mapping), parent_index) : 0); |
| 701 | int first_cluster_of_parent = parent_mapping ? parent_mapping->begin : -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 702 | |
| 703 | DIR* dir=opendir(dirname); |
| 704 | struct dirent* entry; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 705 | int i; |
| 706 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 707 | assert(mapping->mode & MODE_DIRECTORY); |
| 708 | |
| 709 | if(!dir) { |
| 710 | mapping->end = mapping->begin; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 711 | return -1; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 712 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 713 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 714 | i = mapping->info.dir.first_dir_index = |
| 715 | first_cluster == 0 ? 0 : s->directory.next; |
| 716 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 717 | /* actually read the directory, and allocate the mappings */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 718 | while((entry=readdir(dir))) { |
| 719 | unsigned int length=strlen(dirname)+2+strlen(entry->d_name); |
| 720 | char* buffer; |
| 721 | direntry_t* direntry; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 722 | struct stat st; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 723 | int is_dot=!strcmp(entry->d_name,"."); |
| 724 | int is_dotdot=!strcmp(entry->d_name,".."); |
| 725 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 726 | if(first_cluster == 0 && (is_dotdot || is_dot)) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 727 | continue; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 728 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 729 | buffer=(char*)malloc(length); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 730 | assert(buffer); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 731 | snprintf(buffer,length,"%s/%s",dirname,entry->d_name); |
| 732 | |
| 733 | if(stat(buffer,&st)<0) { |
| 734 | free(buffer); |
| 735 | continue; |
| 736 | } |
| 737 | |
| 738 | /* create directory entry for this file */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 739 | direntry=create_short_and_long_name(s, i, entry->d_name, |
| 740 | is_dot || is_dotdot); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 741 | direntry->attributes=(S_ISDIR(st.st_mode)?0x10:0x20); |
| 742 | direntry->reserved[0]=direntry->reserved[1]=0; |
| 743 | direntry->ctime=fat_datetime(st.st_ctime,1); |
| 744 | direntry->cdate=fat_datetime(st.st_ctime,0); |
| 745 | direntry->adate=fat_datetime(st.st_atime,0); |
| 746 | direntry->begin_hi=0; |
| 747 | direntry->mtime=fat_datetime(st.st_mtime,1); |
| 748 | direntry->mdate=fat_datetime(st.st_mtime,0); |
| 749 | if(is_dotdot) |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 750 | set_begin_of_direntry(direntry, first_cluster_of_parent); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 751 | else if(is_dot) |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 752 | set_begin_of_direntry(direntry, first_cluster); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 753 | else |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 754 | direntry->begin=0; /* do that later */ |
| 755 | if (st.st_size > 0x7fffffff) { |
| 756 | fprintf(stderr, "File %s is larger than 2GB\n", buffer); |
| 757 | free(buffer); |
| 758 | return -2; |
| 759 | } |
| 760 | direntry->size=cpu_to_le32(S_ISDIR(st.st_mode)?0:st.st_size); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 761 | |
| 762 | /* create mapping for this file */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 763 | if(!is_dot && !is_dotdot && (S_ISDIR(st.st_mode) || st.st_size)) { |
| 764 | s->current_mapping=(mapping_t*)array_get_next(&(s->mapping)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 765 | s->current_mapping->begin=0; |
| 766 | s->current_mapping->end=st.st_size; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 767 | /* |
| 768 | * we get the direntry of the most recent direntry, which |
| 769 | * contains the short name and all the relevant information. |
| 770 | */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 771 | s->current_mapping->dir_index=s->directory.next-1; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 772 | s->current_mapping->first_mapping_index = -1; |
| 773 | if (S_ISDIR(st.st_mode)) { |
| 774 | s->current_mapping->mode = MODE_DIRECTORY; |
| 775 | s->current_mapping->info.dir.parent_mapping_index = |
| 776 | mapping_index; |
| 777 | } else { |
| 778 | s->current_mapping->mode = MODE_UNDEFINED; |
| 779 | s->current_mapping->info.file.offset = 0; |
| 780 | } |
| 781 | s->current_mapping->path=buffer; |
| 782 | s->current_mapping->read_only = |
| 783 | (st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 784 | } |
| 785 | } |
| 786 | closedir(dir); |
| 787 | |
| 788 | /* fill with zeroes up to the end of the cluster */ |
| 789 | while(s->directory.next%(0x10*s->sectors_per_cluster)) { |
| 790 | direntry_t* direntry=array_get_next(&(s->directory)); |
| 791 | memset(direntry,0,sizeof(direntry_t)); |
| 792 | } |
| 793 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 794 | /* TODO: if there are more entries, bootsector has to be adjusted! */ |
| 795 | #define ROOT_ENTRIES (0x02 * 0x10 * s->sectors_per_cluster) |
| 796 | if (mapping_index == 0 && s->directory.next < ROOT_ENTRIES) { |
| 797 | /* root directory */ |
| 798 | int cur = s->directory.next; |
| 799 | array_ensure_allocated(&(s->directory), ROOT_ENTRIES - 1); |
| 800 | memset(array_get(&(s->directory), cur), 0, |
| 801 | (ROOT_ENTRIES - cur) * sizeof(direntry_t)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 802 | } |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 803 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 804 | /* reget the mapping, since s->mapping was possibly realloc()ed */ |
| 805 | mapping = (mapping_t*)array_get(&(s->mapping), mapping_index); |
| 806 | first_cluster += (s->directory.next - mapping->info.dir.first_dir_index) |
| 807 | * 0x20 / s->cluster_size; |
| 808 | mapping->end = first_cluster; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 809 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 810 | direntry = (direntry_t*)array_get(&(s->directory), mapping->dir_index); |
| 811 | set_begin_of_direntry(direntry, mapping->begin); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 812 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 813 | return 0; |
| 814 | } |
| 815 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 816 | static inline uint32_t sector2cluster(BDRVVVFATState* s,off_t sector_num) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 817 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 818 | return (sector_num-s->faked_sectors)/s->sectors_per_cluster; |
| 819 | } |
| 820 | |
| 821 | static inline off_t cluster2sector(BDRVVVFATState* s, uint32_t cluster_num) |
| 822 | { |
| 823 | return s->faked_sectors + s->sectors_per_cluster * cluster_num; |
| 824 | } |
| 825 | |
| 826 | static inline uint32_t sector_offset_in_cluster(BDRVVVFATState* s,off_t sector_num) |
| 827 | { |
| 828 | return (sector_num-s->first_sectors_number-2*s->sectors_per_fat)%s->sectors_per_cluster; |
| 829 | } |
| 830 | |
| 831 | #ifdef DBG |
| 832 | static direntry_t* get_direntry_for_mapping(BDRVVVFATState* s,mapping_t* mapping) |
| 833 | { |
| 834 | if(mapping->mode==MODE_UNDEFINED) |
| 835 | return 0; |
| 836 | return (direntry_t*)(s->directory.pointer+sizeof(direntry_t)*mapping->dir_index); |
| 837 | } |
| 838 | #endif |
| 839 | |
| 840 | static int init_directories(BDRVVVFATState* s, |
| 841 | const char* dirname) |
| 842 | { |
| 843 | bootsector_t* bootsector; |
| 844 | mapping_t* mapping; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 845 | unsigned int i; |
| 846 | unsigned int cluster; |
| 847 | |
| 848 | memset(&(s->first_sectors[0]),0,0x40*0x200); |
| 849 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 850 | s->cluster_size=s->sectors_per_cluster*0x200; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 851 | s->cluster_buffer=malloc(s->cluster_size); |
| 852 | assert(s->cluster_buffer); |
| 853 | |
| 854 | /* |
| 855 | * The formula: sc = spf+1+spf*spc*(512*8/fat_type), |
| 856 | * where sc is sector_count, |
| 857 | * spf is sectors_per_fat, |
| 858 | * spc is sectors_per_clusters, and |
| 859 | * fat_type = 12, 16 or 32. |
| 860 | */ |
| 861 | i = 1+s->sectors_per_cluster*0x200*8/s->fat_type; |
| 862 | s->sectors_per_fat=(s->sector_count+i)/i; /* round up */ |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 863 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 864 | array_init(&(s->mapping),sizeof(mapping_t)); |
| 865 | array_init(&(s->directory),sizeof(direntry_t)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 866 | |
| 867 | /* add volume label */ |
| 868 | { |
| 869 | direntry_t* entry=array_get_next(&(s->directory)); |
| 870 | entry->attributes=0x28; /* archive | volume label */ |
| 871 | snprintf(entry->name,11,"QEMU VVFAT"); |
| 872 | } |
| 873 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 874 | /* Now build FAT, and write back information into directory */ |
| 875 | init_fat(s); |
| 876 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 877 | s->faked_sectors=s->first_sectors_number+s->sectors_per_fat*2; |
| 878 | s->cluster_count=sector2cluster(s, s->sector_count); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 879 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 880 | mapping = array_get_next(&(s->mapping)); |
| 881 | mapping->begin = 0; |
| 882 | mapping->dir_index = 0; |
| 883 | mapping->info.dir.parent_mapping_index = -1; |
| 884 | mapping->first_mapping_index = -1; |
| 885 | mapping->path = strdup(dirname); |
| 886 | i = strlen(mapping->path); |
| 887 | if (i > 0 && mapping->path[i - 1] == '/') |
| 888 | mapping->path[i - 1] = '\0'; |
| 889 | mapping->mode = MODE_DIRECTORY; |
| 890 | mapping->read_only = 0; |
| 891 | s->path = mapping->path; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 892 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 893 | for (i = 0, cluster = 0; i < s->mapping.next; i++) { |
| 894 | int j; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 895 | /* MS-DOS expects the FAT to be 0 for the root directory |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 896 | * (except for the media byte). */ |
| 897 | /* LATER TODO: still true for FAT32? */ |
| 898 | int fix_fat = (i != 0); |
| 899 | mapping = array_get(&(s->mapping), i); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 900 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 901 | if (mapping->mode & MODE_DIRECTORY) { |
| 902 | mapping->begin = cluster; |
| 903 | if(read_directory(s, i)) { |
| 904 | fprintf(stderr, "Could not read directory %s\n", |
| 905 | mapping->path); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 906 | return -1; |
| 907 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 908 | mapping = array_get(&(s->mapping), i); |
| 909 | } else { |
| 910 | assert(mapping->mode == MODE_UNDEFINED); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 911 | mapping->mode=MODE_NORMAL; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 912 | mapping->begin = cluster; |
| 913 | if (mapping->end > 0) { |
| 914 | direntry_t* direntry = array_get(&(s->directory), |
| 915 | mapping->dir_index); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 916 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 917 | mapping->end = cluster + 1 + (mapping->end-1)/s->cluster_size; |
| 918 | set_begin_of_direntry(direntry, mapping->begin); |
| 919 | } else { |
| 920 | mapping->end = cluster + 1; |
| 921 | fix_fat = 0; |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | assert(mapping->begin < mapping->end); |
| 926 | |
| 927 | /* fix fat for entry */ |
| 928 | if (fix_fat) { |
| 929 | for(j = mapping->begin; j < mapping->end - 1; j++) |
| 930 | fat_set(s, j, j+1); |
| 931 | fat_set(s, mapping->end - 1, s->max_fat_value); |
| 932 | } |
| 933 | |
| 934 | /* next free cluster */ |
| 935 | cluster = mapping->end; |
| 936 | |
| 937 | if(cluster > s->cluster_count) { |
| 938 | fprintf(stderr,"Directory does not fit in FAT%d\n",s->fat_type); |
| 939 | return -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 940 | } |
| 941 | } |
| 942 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 943 | mapping = array_get(&(s->mapping), 0); |
| 944 | s->sectors_of_root_directory = mapping->end * s->sectors_per_cluster; |
| 945 | s->last_cluster_of_root_directory = mapping->end; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 946 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 947 | /* the FAT signature */ |
| 948 | fat_set(s,0,s->max_fat_value); |
| 949 | fat_set(s,1,s->max_fat_value); |
| 950 | |
| 951 | s->current_mapping = NULL; |
| 952 | |
| 953 | bootsector=(bootsector_t*)(s->first_sectors+(s->first_sectors_number-1)*0x200); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 954 | bootsector->jump[0]=0xeb; |
| 955 | bootsector->jump[1]=0x3e; |
| 956 | bootsector->jump[2]=0x90; |
| 957 | memcpy(bootsector->name,"QEMU ",8); |
| 958 | bootsector->sector_size=cpu_to_le16(0x200); |
| 959 | bootsector->sectors_per_cluster=s->sectors_per_cluster; |
| 960 | bootsector->reserved_sectors=cpu_to_le16(1); |
| 961 | bootsector->number_of_fats=0x2; /* number of FATs */ |
| 962 | bootsector->root_entries=cpu_to_le16(s->sectors_of_root_directory*0x10); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 963 | bootsector->total_sectors16=s->sector_count>0xffff?0:cpu_to_le16(s->sector_count); |
| 964 | bootsector->media_type=(s->fat_type!=12?0xf8:s->sector_count==5760?0xf9:0xf8); /* media descriptor */ |
| 965 | s->fat.pointer[0] = bootsector->media_type; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 966 | bootsector->sectors_per_fat=cpu_to_le16(s->sectors_per_fat); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 967 | bootsector->sectors_per_track=cpu_to_le16(s->bs->secs); |
| 968 | bootsector->number_of_heads=cpu_to_le16(s->bs->heads); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 969 | bootsector->hidden_sectors=cpu_to_le32(s->first_sectors_number==1?0:0x3f); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 970 | bootsector->total_sectors=cpu_to_le32(s->sector_count>0xffff?s->sector_count:0); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 971 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 972 | /* LATER TODO: if FAT32, this is wrong */ |
| 973 | bootsector->u.fat16.drive_number=s->fat_type==12?0:0x80; /* assume this is hda (TODO) */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 974 | bootsector->u.fat16.current_head=0; |
| 975 | bootsector->u.fat16.signature=0x29; |
| 976 | bootsector->u.fat16.id=cpu_to_le32(0xfabe1afd); |
| 977 | |
| 978 | memcpy(bootsector->u.fat16.volume_label,"QEMU VVFAT ",11); |
| 979 | memcpy(bootsector->fat_type,(s->fat_type==12?"FAT12 ":s->fat_type==16?"FAT16 ":"FAT32 "),8); |
| 980 | bootsector->magic[0]=0x55; bootsector->magic[1]=0xaa; |
| 981 | |
| 982 | return 0; |
| 983 | } |
| 984 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 985 | #ifdef DEBUG |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 986 | static BDRVVVFATState *vvv = NULL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 987 | #endif |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 988 | |
| 989 | static int enable_write_target(BDRVVVFATState *s); |
| 990 | static int is_consistent(BDRVVVFATState *s); |
| 991 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 992 | static int vvfat_open(BlockDriverState *bs, const char* dirname, int flags) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 993 | { |
| 994 | BDRVVVFATState *s = bs->opaque; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 995 | int floppy = 0; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 996 | int i; |
| 997 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 998 | #ifdef DEBUG |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 999 | vvv = s; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 1000 | #endif |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1001 | |
| 1002 | DLOG(if (stderr == NULL) { |
| 1003 | stderr = fopen("vvfat.log", "a"); |
| 1004 | setbuf(stderr, NULL); |
| 1005 | }) |
| 1006 | |
| 1007 | s->bs = bs; |
| 1008 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1009 | s->fat_type=16; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1010 | /* LATER TODO: if FAT32, adjust */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1011 | s->sectors_per_cluster=0x10; |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 1012 | /* 504MB disk*/ |
| 1013 | bs->cyls=1024; bs->heads=16; bs->secs=63; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1014 | |
| 1015 | s->current_cluster=0xffffffff; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1016 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1017 | s->first_sectors_number=0x40; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1018 | /* read only is the default for safety */ |
| 1019 | bs->read_only = 1; |
| 1020 | s->qcow = s->write_target = NULL; |
| 1021 | s->qcow_filename = NULL; |
| 1022 | s->fat2 = NULL; |
| 1023 | s->downcase_short_names = 1; |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 1024 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1025 | if (!strstart(dirname, "fat:", NULL)) |
| 1026 | return -1; |
| 1027 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1028 | if (strstr(dirname, ":floppy:")) { |
| 1029 | floppy = 1; |
| 1030 | s->fat_type = 12; |
| 1031 | s->first_sectors_number = 1; |
| 1032 | s->sectors_per_cluster=2; |
| 1033 | bs->cyls = 80; bs->heads = 2; bs->secs = 36; |
| 1034 | } |
| 1035 | |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 1036 | s->sector_count=bs->cyls*bs->heads*bs->secs; |
| 1037 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1038 | if (strstr(dirname, ":32:")) { |
| 1039 | fprintf(stderr, "Big fat greek warning: FAT32 has not been tested. You are welcome to do so!\n"); |
| 1040 | s->fat_type = 32; |
| 1041 | } else if (strstr(dirname, ":16:")) { |
| 1042 | s->fat_type = 16; |
| 1043 | } else if (strstr(dirname, ":12:")) { |
| 1044 | s->fat_type = 12; |
| 1045 | s->sector_count=2880; |
| 1046 | } |
| 1047 | |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 1048 | if (strstr(dirname, ":rw:")) { |
| 1049 | if (enable_write_target(s)) |
| 1050 | return -1; |
| 1051 | bs->read_only = 0; |
| 1052 | } |
| 1053 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1054 | i = strrchr(dirname, ':') - dirname; |
| 1055 | assert(i >= 3); |
| 1056 | if (dirname[i-2] == ':' && isalpha(dirname[i-1])) |
| 1057 | /* workaround for DOS drive names */ |
| 1058 | dirname += i-1; |
| 1059 | else |
| 1060 | dirname += i+1; |
| 1061 | |
| 1062 | bs->total_sectors=bs->cyls*bs->heads*bs->secs; |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 1063 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1064 | if(init_directories(s, dirname)) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1065 | return -1; |
| 1066 | |
ths | b570094 | 2007-09-25 14:47:03 +0000 | [diff] [blame] | 1067 | s->sector_count = s->faked_sectors + s->sectors_per_cluster*s->cluster_count; |
| 1068 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1069 | if(s->first_sectors_number==0x40) |
| 1070 | init_mbr(s); |
| 1071 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1072 | /* for some reason or other, MS-DOS does not like to know about CHS... */ |
| 1073 | if (floppy) |
| 1074 | bs->heads = bs->cyls = bs->secs = 0; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1075 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1076 | // assert(is_consistent(s)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1077 | return 0; |
| 1078 | } |
| 1079 | |
| 1080 | static inline void vvfat_close_current_file(BDRVVVFATState *s) |
| 1081 | { |
| 1082 | if(s->current_mapping) { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1083 | s->current_mapping = NULL; |
| 1084 | if (s->current_fd) { |
| 1085 | close(s->current_fd); |
| 1086 | s->current_fd = 0; |
| 1087 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1088 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1089 | s->current_cluster = -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1090 | } |
| 1091 | |
| 1092 | /* mappings between index1 and index2-1 are supposed to be ordered |
| 1093 | * return value is the index of the last mapping for which end>cluster_num |
| 1094 | */ |
| 1095 | static inline int find_mapping_for_cluster_aux(BDRVVVFATState* s,int cluster_num,int index1,int index2) |
| 1096 | { |
| 1097 | int index3=index1+1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1098 | while(1) { |
| 1099 | mapping_t* mapping; |
| 1100 | index3=(index1+index2)/2; |
| 1101 | mapping=array_get(&(s->mapping),index3); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1102 | assert(mapping->begin < mapping->end); |
| 1103 | if(mapping->begin>=cluster_num) { |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1104 | assert(index2!=index3 || index2==0); |
| 1105 | if(index2==index3) |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1106 | return index1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1107 | index2=index3; |
| 1108 | } else { |
| 1109 | if(index1==index3) |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1110 | return mapping->end<=cluster_num ? index2 : index1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1111 | index1=index3; |
| 1112 | } |
| 1113 | assert(index1<=index2); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1114 | DLOG(mapping=array_get(&(s->mapping),index1); |
| 1115 | assert(mapping->begin<=cluster_num); |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 1116 | assert(index2 >= s->mapping.next || |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1117 | ((mapping = array_get(&(s->mapping),index2)) && |
| 1118 | mapping->end>cluster_num))); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1119 | } |
| 1120 | } |
| 1121 | |
| 1122 | static inline mapping_t* find_mapping_for_cluster(BDRVVVFATState* s,int cluster_num) |
| 1123 | { |
| 1124 | int index=find_mapping_for_cluster_aux(s,cluster_num,0,s->mapping.next); |
| 1125 | mapping_t* mapping; |
| 1126 | if(index>=s->mapping.next) |
| 1127 | return 0; |
| 1128 | mapping=array_get(&(s->mapping),index); |
| 1129 | if(mapping->begin>cluster_num) |
| 1130 | return 0; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1131 | assert(mapping->begin<=cluster_num && mapping->end>cluster_num); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1132 | return mapping; |
| 1133 | } |
| 1134 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1135 | /* |
| 1136 | * This function simply compares path == mapping->path. Since the mappings |
| 1137 | * are sorted by cluster, this is expensive: O(n). |
| 1138 | */ |
| 1139 | static inline mapping_t* find_mapping_for_path(BDRVVVFATState* s, |
| 1140 | const char* path) |
| 1141 | { |
| 1142 | int i; |
| 1143 | |
| 1144 | for (i = 0; i < s->mapping.next; i++) { |
| 1145 | mapping_t* mapping = array_get(&(s->mapping), i); |
| 1146 | if (mapping->first_mapping_index < 0 && |
| 1147 | !strcmp(path, mapping->path)) |
| 1148 | return mapping; |
| 1149 | } |
| 1150 | |
| 1151 | return NULL; |
| 1152 | } |
| 1153 | |
| 1154 | static int open_file(BDRVVVFATState* s,mapping_t* mapping) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1155 | { |
| 1156 | if(!mapping) |
| 1157 | return -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1158 | if(!s->current_mapping || |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1159 | strcmp(s->current_mapping->path,mapping->path)) { |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1160 | /* open file */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1161 | int fd = open(mapping->path, O_RDONLY | O_BINARY | O_LARGEFILE); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1162 | if(fd<0) |
| 1163 | return -1; |
| 1164 | vvfat_close_current_file(s); |
| 1165 | s->current_fd = fd; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1166 | s->current_mapping = mapping; |
| 1167 | } |
| 1168 | return 0; |
| 1169 | } |
| 1170 | |
| 1171 | static inline int read_cluster(BDRVVVFATState *s,int cluster_num) |
| 1172 | { |
| 1173 | if(s->current_cluster != cluster_num) { |
| 1174 | int result=0; |
| 1175 | off_t offset; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1176 | assert(!s->current_mapping || s->current_fd || (s->current_mapping->mode & MODE_DIRECTORY)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1177 | if(!s->current_mapping |
| 1178 | || s->current_mapping->begin>cluster_num |
| 1179 | || s->current_mapping->end<=cluster_num) { |
| 1180 | /* binary search of mappings for file */ |
| 1181 | mapping_t* mapping=find_mapping_for_cluster(s,cluster_num); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1182 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1183 | assert(!mapping || (cluster_num>=mapping->begin && cluster_num<mapping->end)); |
| 1184 | |
| 1185 | if (mapping && mapping->mode & MODE_DIRECTORY) { |
| 1186 | vvfat_close_current_file(s); |
| 1187 | s->current_mapping = mapping; |
| 1188 | read_cluster_directory: |
| 1189 | offset = s->cluster_size*(cluster_num-s->current_mapping->begin); |
| 1190 | s->cluster = s->directory.pointer+offset |
| 1191 | + 0x20*s->current_mapping->info.dir.first_dir_index; |
| 1192 | assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0); |
| 1193 | assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size); |
| 1194 | s->current_cluster = cluster_num; |
| 1195 | return 0; |
| 1196 | } |
| 1197 | |
| 1198 | if(open_file(s,mapping)) |
| 1199 | return -2; |
| 1200 | } else if (s->current_mapping->mode & MODE_DIRECTORY) |
| 1201 | goto read_cluster_directory; |
| 1202 | |
| 1203 | assert(s->current_fd); |
| 1204 | |
| 1205 | offset=s->cluster_size*(cluster_num-s->current_mapping->begin)+s->current_mapping->info.file.offset; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1206 | if(lseek(s->current_fd, offset, SEEK_SET)!=offset) |
| 1207 | return -3; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1208 | s->cluster=s->cluster_buffer; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1209 | result=read(s->current_fd,s->cluster,s->cluster_size); |
| 1210 | if(result<0) { |
| 1211 | s->current_cluster = -1; |
| 1212 | return -1; |
| 1213 | } |
| 1214 | s->current_cluster = cluster_num; |
| 1215 | } |
| 1216 | return 0; |
| 1217 | } |
| 1218 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1219 | #ifdef DEBUG |
| 1220 | static void hexdump(const void* address, uint32_t len) |
| 1221 | { |
| 1222 | const unsigned char* p = address; |
| 1223 | int i, j; |
| 1224 | |
| 1225 | for (i = 0; i < len; i += 16) { |
| 1226 | for (j = 0; j < 16 && i + j < len; j++) |
| 1227 | fprintf(stderr, "%02x ", p[i + j]); |
| 1228 | for (; j < 16; j++) |
| 1229 | fprintf(stderr, " "); |
| 1230 | fprintf(stderr, " "); |
| 1231 | for (j = 0; j < 16 && i + j < len; j++) |
| 1232 | fprintf(stderr, "%c", (p[i + j] < ' ' || p[i + j] > 0x7f) ? '.' : p[i + j]); |
| 1233 | fprintf(stderr, "\n"); |
| 1234 | } |
| 1235 | } |
| 1236 | |
| 1237 | static void print_direntry(const direntry_t* direntry) |
| 1238 | { |
| 1239 | int j = 0; |
| 1240 | char buffer[1024]; |
| 1241 | |
| 1242 | fprintf(stderr, "direntry 0x%x: ", (int)direntry); |
| 1243 | if(!direntry) |
| 1244 | return; |
| 1245 | if(is_long_name(direntry)) { |
| 1246 | unsigned char* c=(unsigned char*)direntry; |
| 1247 | int i; |
| 1248 | for(i=1;i<11 && c[i] && c[i]!=0xff;i+=2) |
| 1249 | #define ADD_CHAR(c) {buffer[j] = (c); if (buffer[j] < ' ') buffer[j] = '°'; j++;} |
| 1250 | ADD_CHAR(c[i]); |
| 1251 | for(i=14;i<26 && c[i] && c[i]!=0xff;i+=2) |
| 1252 | ADD_CHAR(c[i]); |
| 1253 | for(i=28;i<32 && c[i] && c[i]!=0xff;i+=2) |
| 1254 | ADD_CHAR(c[i]); |
| 1255 | buffer[j] = 0; |
| 1256 | fprintf(stderr, "%s\n", buffer); |
| 1257 | } else { |
| 1258 | int i; |
| 1259 | for(i=0;i<11;i++) |
| 1260 | ADD_CHAR(direntry->name[i]); |
| 1261 | buffer[j] = 0; |
| 1262 | fprintf(stderr,"%s attributes=0x%02x begin=%d size=%d\n", |
| 1263 | buffer, |
| 1264 | direntry->attributes, |
| 1265 | begin_of_direntry(direntry),le32_to_cpu(direntry->size)); |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | static void print_mapping(const mapping_t* mapping) |
| 1270 | { |
| 1271 | fprintf(stderr, "mapping (0x%x): begin, end = %d, %d, dir_index = %d, first_mapping_index = %d, name = %s, mode = 0x%x, " , (int)mapping, mapping->begin, mapping->end, mapping->dir_index, mapping->first_mapping_index, mapping->path, mapping->mode); |
| 1272 | if (mapping->mode & MODE_DIRECTORY) |
| 1273 | fprintf(stderr, "parent_mapping_index = %d, first_dir_index = %d\n", mapping->info.dir.parent_mapping_index, mapping->info.dir.first_dir_index); |
| 1274 | else |
| 1275 | fprintf(stderr, "offset = %d\n", mapping->info.file.offset); |
| 1276 | } |
| 1277 | #endif |
| 1278 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 1279 | static int vvfat_read(BlockDriverState *bs, int64_t sector_num, |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1280 | uint8_t *buf, int nb_sectors) |
| 1281 | { |
| 1282 | BDRVVVFATState *s = bs->opaque; |
| 1283 | int i; |
| 1284 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1285 | for(i=0;i<nb_sectors;i++,sector_num++) { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1286 | if (sector_num >= s->sector_count) |
| 1287 | return -1; |
| 1288 | if (s->qcow) { |
| 1289 | int n; |
| 1290 | if (s->qcow->drv->bdrv_is_allocated(s->qcow, |
| 1291 | sector_num, nb_sectors-i, &n)) { |
| 1292 | DLOG(fprintf(stderr, "sectors %d+%d allocated\n", (int)sector_num, n)); |
| 1293 | if (s->qcow->drv->bdrv_read(s->qcow, sector_num, buf+i*0x200, n)) |
| 1294 | return -1; |
| 1295 | i += n - 1; |
| 1296 | sector_num += n - 1; |
| 1297 | continue; |
| 1298 | } |
| 1299 | DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num)); |
| 1300 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1301 | if(sector_num<s->faked_sectors) { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1302 | if(sector_num<s->first_sectors_number) |
| 1303 | memcpy(buf+i*0x200,&(s->first_sectors[sector_num*0x200]),0x200); |
| 1304 | else if(sector_num-s->first_sectors_number<s->sectors_per_fat) |
| 1305 | memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number)*0x200]),0x200); |
| 1306 | else if(sector_num-s->first_sectors_number-s->sectors_per_fat<s->sectors_per_fat) |
| 1307 | memcpy(buf+i*0x200,&(s->fat.pointer[(sector_num-s->first_sectors_number-s->sectors_per_fat)*0x200]),0x200); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1308 | } else { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1309 | uint32_t sector=sector_num-s->faked_sectors, |
| 1310 | sector_offset_in_cluster=(sector%s->sectors_per_cluster), |
| 1311 | cluster_num=sector/s->sectors_per_cluster; |
| 1312 | if(read_cluster(s, cluster_num) != 0) { |
| 1313 | /* LATER TODO: strict: return -1; */ |
| 1314 | memset(buf+i*0x200,0,0x200); |
| 1315 | continue; |
| 1316 | } |
| 1317 | memcpy(buf+i*0x200,s->cluster+sector_offset_in_cluster*0x200,0x200); |
| 1318 | } |
| 1319 | } |
| 1320 | return 0; |
| 1321 | } |
| 1322 | |
| 1323 | /* LATER TODO: statify all functions */ |
| 1324 | |
| 1325 | /* |
| 1326 | * Idea of the write support (use snapshot): |
| 1327 | * |
| 1328 | * 1. check if all data is consistent, recording renames, modifications, |
| 1329 | * new files and directories (in s->commits). |
| 1330 | * |
| 1331 | * 2. if the data is not consistent, stop committing |
| 1332 | * |
| 1333 | * 3. handle renames, and create new files and directories (do not yet |
| 1334 | * write their contents) |
| 1335 | * |
| 1336 | * 4. walk the directories, fixing the mapping and direntries, and marking |
| 1337 | * the handled mappings as not deleted |
| 1338 | * |
| 1339 | * 5. commit the contents of the files |
| 1340 | * |
| 1341 | * 6. handle deleted files and directories |
| 1342 | * |
| 1343 | */ |
| 1344 | |
| 1345 | typedef struct commit_t { |
| 1346 | char* path; |
| 1347 | union { |
| 1348 | struct { uint32_t cluster; } rename; |
| 1349 | struct { int dir_index; uint32_t modified_offset; } writeout; |
| 1350 | struct { uint32_t first_cluster; } new_file; |
| 1351 | struct { uint32_t cluster; } mkdir; |
| 1352 | } param; |
| 1353 | /* DELETEs and RMDIRs are handled differently: see handle_deletes() */ |
| 1354 | enum { |
| 1355 | ACTION_RENAME, ACTION_WRITEOUT, ACTION_NEW_FILE, ACTION_MKDIR |
| 1356 | } action; |
| 1357 | } commit_t; |
| 1358 | |
| 1359 | static void clear_commits(BDRVVVFATState* s) |
| 1360 | { |
| 1361 | int i; |
| 1362 | DLOG(fprintf(stderr, "clear_commits (%d commits)\n", s->commits.next)); |
| 1363 | for (i = 0; i < s->commits.next; i++) { |
| 1364 | commit_t* commit = array_get(&(s->commits), i); |
| 1365 | assert(commit->path || commit->action == ACTION_WRITEOUT); |
| 1366 | if (commit->action != ACTION_WRITEOUT) { |
| 1367 | assert(commit->path); |
| 1368 | free(commit->path); |
| 1369 | } else |
| 1370 | assert(commit->path == NULL); |
| 1371 | } |
| 1372 | s->commits.next = 0; |
| 1373 | } |
| 1374 | |
| 1375 | static void schedule_rename(BDRVVVFATState* s, |
| 1376 | uint32_t cluster, char* new_path) |
| 1377 | { |
| 1378 | commit_t* commit = array_get_next(&(s->commits)); |
| 1379 | commit->path = new_path; |
| 1380 | commit->param.rename.cluster = cluster; |
| 1381 | commit->action = ACTION_RENAME; |
| 1382 | } |
| 1383 | |
| 1384 | static void schedule_writeout(BDRVVVFATState* s, |
| 1385 | int dir_index, uint32_t modified_offset) |
| 1386 | { |
| 1387 | commit_t* commit = array_get_next(&(s->commits)); |
| 1388 | commit->path = NULL; |
| 1389 | commit->param.writeout.dir_index = dir_index; |
| 1390 | commit->param.writeout.modified_offset = modified_offset; |
| 1391 | commit->action = ACTION_WRITEOUT; |
| 1392 | } |
| 1393 | |
| 1394 | static void schedule_new_file(BDRVVVFATState* s, |
| 1395 | char* path, uint32_t first_cluster) |
| 1396 | { |
| 1397 | commit_t* commit = array_get_next(&(s->commits)); |
| 1398 | commit->path = path; |
| 1399 | commit->param.new_file.first_cluster = first_cluster; |
| 1400 | commit->action = ACTION_NEW_FILE; |
| 1401 | } |
| 1402 | |
| 1403 | static void schedule_mkdir(BDRVVVFATState* s, uint32_t cluster, char* path) |
| 1404 | { |
| 1405 | commit_t* commit = array_get_next(&(s->commits)); |
| 1406 | commit->path = path; |
| 1407 | commit->param.mkdir.cluster = cluster; |
| 1408 | commit->action = ACTION_MKDIR; |
| 1409 | } |
| 1410 | |
| 1411 | typedef struct { |
| 1412 | unsigned char name[1024]; |
| 1413 | int checksum, len; |
| 1414 | int sequence_number; |
| 1415 | } long_file_name; |
| 1416 | |
| 1417 | static void lfn_init(long_file_name* lfn) |
| 1418 | { |
| 1419 | lfn->sequence_number = lfn->len = 0; |
| 1420 | lfn->checksum = 0x100; |
| 1421 | } |
| 1422 | |
| 1423 | /* return 0 if parsed successfully, > 0 if no long name, < 0 if error */ |
| 1424 | static int parse_long_name(long_file_name* lfn, |
| 1425 | const direntry_t* direntry) |
| 1426 | { |
| 1427 | int i, j, offset; |
| 1428 | const unsigned char* pointer = (const unsigned char*)direntry; |
| 1429 | |
| 1430 | if (!is_long_name(direntry)) |
| 1431 | return 1; |
| 1432 | |
| 1433 | if (pointer[0] & 0x40) { |
| 1434 | lfn->sequence_number = pointer[0] & 0x3f; |
| 1435 | lfn->checksum = pointer[13]; |
| 1436 | lfn->name[0] = 0; |
| 1437 | } else if ((pointer[0] & 0x3f) != --lfn->sequence_number) |
| 1438 | return -1; |
| 1439 | else if (pointer[13] != lfn->checksum) |
| 1440 | return -2; |
| 1441 | else if (pointer[12] || pointer[26] || pointer[27]) |
| 1442 | return -3; |
| 1443 | |
| 1444 | offset = 13 * (lfn->sequence_number - 1); |
| 1445 | for (i = 0, j = 1; i < 13; i++, j+=2) { |
| 1446 | if (j == 11) |
| 1447 | j = 14; |
| 1448 | else if (j == 26) |
| 1449 | j = 28; |
| 1450 | |
| 1451 | if (pointer[j+1] == 0) |
| 1452 | lfn->name[offset + i] = pointer[j]; |
| 1453 | else if (pointer[j+1] != 0xff || (pointer[0] & 0x40) == 0) |
| 1454 | return -4; |
| 1455 | else |
| 1456 | lfn->name[offset + i] = 0; |
| 1457 | } |
| 1458 | |
| 1459 | if (pointer[0] & 0x40) |
| 1460 | lfn->len = offset + strlen(lfn->name + offset); |
| 1461 | |
| 1462 | return 0; |
| 1463 | } |
| 1464 | |
| 1465 | /* returns 0 if successful, >0 if no short_name, and <0 on error */ |
| 1466 | static int parse_short_name(BDRVVVFATState* s, |
| 1467 | long_file_name* lfn, direntry_t* direntry) |
| 1468 | { |
| 1469 | int i, j; |
| 1470 | |
| 1471 | if (!is_short_name(direntry)) |
| 1472 | return 1; |
| 1473 | |
| 1474 | for (j = 7; j >= 0 && direntry->name[j] == ' '; j--); |
| 1475 | for (i = 0; i <= j; i++) { |
| 1476 | if (direntry->name[i] <= ' ' || direntry->name[i] > 0x7f) |
| 1477 | return -1; |
| 1478 | else if (s->downcase_short_names) |
| 1479 | lfn->name[i] = tolower(direntry->name[i]); |
| 1480 | else |
| 1481 | lfn->name[i] = direntry->name[i]; |
| 1482 | } |
| 1483 | |
| 1484 | for (j = 2; j >= 0 && direntry->extension[j] == ' '; j--); |
| 1485 | if (j >= 0) { |
| 1486 | lfn->name[i++] = '.'; |
| 1487 | lfn->name[i + j + 1] = '\0'; |
| 1488 | for (;j >= 0; j--) { |
| 1489 | if (direntry->extension[j] <= ' ' || direntry->extension[j] > 0x7f) |
| 1490 | return -2; |
| 1491 | else if (s->downcase_short_names) |
| 1492 | lfn->name[i + j] = tolower(direntry->extension[j]); |
| 1493 | else |
| 1494 | lfn->name[i + j] = direntry->extension[j]; |
| 1495 | } |
| 1496 | } else |
| 1497 | lfn->name[i + j + 1] = '\0'; |
| 1498 | |
| 1499 | lfn->len = strlen(lfn->name); |
| 1500 | |
| 1501 | return 0; |
| 1502 | } |
| 1503 | |
| 1504 | static inline uint32_t modified_fat_get(BDRVVVFATState* s, |
| 1505 | unsigned int cluster) |
| 1506 | { |
| 1507 | if (cluster < s->last_cluster_of_root_directory) { |
| 1508 | if (cluster + 1 == s->last_cluster_of_root_directory) |
| 1509 | return s->max_fat_value; |
| 1510 | else |
| 1511 | return cluster + 1; |
| 1512 | } |
| 1513 | |
| 1514 | if (s->fat_type==32) { |
| 1515 | uint32_t* entry=((uint32_t*)s->fat2)+cluster; |
| 1516 | return le32_to_cpu(*entry); |
| 1517 | } else if (s->fat_type==16) { |
| 1518 | uint16_t* entry=((uint16_t*)s->fat2)+cluster; |
| 1519 | return le16_to_cpu(*entry); |
| 1520 | } else { |
| 1521 | const uint8_t* x=s->fat2+cluster*3/2; |
| 1522 | return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff; |
| 1523 | } |
| 1524 | } |
| 1525 | |
| 1526 | static inline int cluster_was_modified(BDRVVVFATState* s, uint32_t cluster_num) |
| 1527 | { |
| 1528 | int was_modified = 0; |
| 1529 | int i, dummy; |
| 1530 | |
| 1531 | if (s->qcow == NULL) |
| 1532 | return 0; |
| 1533 | |
| 1534 | for (i = 0; !was_modified && i < s->sectors_per_cluster; i++) |
| 1535 | was_modified = s->qcow->drv->bdrv_is_allocated(s->qcow, |
| 1536 | cluster2sector(s, cluster_num) + i, 1, &dummy); |
| 1537 | |
| 1538 | return was_modified; |
| 1539 | } |
| 1540 | |
| 1541 | static const char* get_basename(const char* path) |
| 1542 | { |
| 1543 | char* basename = strrchr(path, '/'); |
| 1544 | if (basename == NULL) |
| 1545 | return path; |
| 1546 | else |
| 1547 | return basename + 1; /* strip '/' */ |
| 1548 | } |
| 1549 | |
| 1550 | /* |
| 1551 | * The array s->used_clusters holds the states of the clusters. If it is |
| 1552 | * part of a file, it has bit 2 set, in case of a directory, bit 1. If it |
| 1553 | * was modified, bit 3 is set. |
| 1554 | * If any cluster is allocated, but not part of a file or directory, this |
| 1555 | * driver refuses to commit. |
| 1556 | */ |
| 1557 | typedef enum { |
| 1558 | USED_DIRECTORY = 1, USED_FILE = 2, USED_ANY = 3, USED_ALLOCATED = 4 |
| 1559 | } used_t; |
| 1560 | |
| 1561 | /* |
| 1562 | * get_cluster_count_for_direntry() not only determines how many clusters |
| 1563 | * are occupied by direntry, but also if it was renamed or modified. |
| 1564 | * |
| 1565 | * A file is thought to be renamed *only* if there already was a file with |
| 1566 | * exactly the same first cluster, but a different name. |
| 1567 | * |
| 1568 | * Further, the files/directories handled by this function are |
| 1569 | * assumed to be *not* deleted (and *only* those). |
| 1570 | */ |
| 1571 | static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s, |
| 1572 | direntry_t* direntry, const char* path) |
| 1573 | { |
| 1574 | /* |
| 1575 | * This is a little bit tricky: |
| 1576 | * IF the guest OS just inserts a cluster into the file chain, |
| 1577 | * and leaves the rest alone, (i.e. the original file had clusters |
| 1578 | * 15 -> 16, but now has 15 -> 32 -> 16), then the following happens: |
| 1579 | * |
| 1580 | * - do_commit will write the cluster into the file at the given |
| 1581 | * offset, but |
| 1582 | * |
| 1583 | * - the cluster which is overwritten should be moved to a later |
| 1584 | * position in the file. |
| 1585 | * |
| 1586 | * I am not aware that any OS does something as braindead, but this |
| 1587 | * situation could happen anyway when not committing for a long time. |
| 1588 | * Just to be sure that this does not bite us, detect it, and copy the |
| 1589 | * contents of the clusters to-be-overwritten into the qcow. |
| 1590 | */ |
| 1591 | int copy_it = 0; |
| 1592 | int was_modified = 0; |
| 1593 | int32_t ret = 0; |
| 1594 | |
| 1595 | uint32_t cluster_num = begin_of_direntry(direntry); |
| 1596 | uint32_t offset = 0; |
| 1597 | int first_mapping_index = -1; |
| 1598 | mapping_t* mapping = NULL; |
| 1599 | const char* basename2 = NULL; |
| 1600 | |
| 1601 | vvfat_close_current_file(s); |
| 1602 | |
| 1603 | /* the root directory */ |
| 1604 | if (cluster_num == 0) |
| 1605 | return 0; |
| 1606 | |
| 1607 | /* write support */ |
| 1608 | if (s->qcow) { |
| 1609 | basename2 = get_basename(path); |
| 1610 | |
| 1611 | mapping = find_mapping_for_cluster(s, cluster_num); |
| 1612 | |
| 1613 | if (mapping) { |
bellard | da2414e | 2006-04-23 14:36:41 +0000 | [diff] [blame] | 1614 | const char* basename; |
| 1615 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1616 | assert(mapping->mode & MODE_DELETED); |
| 1617 | mapping->mode &= ~MODE_DELETED; |
| 1618 | |
bellard | da2414e | 2006-04-23 14:36:41 +0000 | [diff] [blame] | 1619 | basename = get_basename(mapping->path); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1620 | |
| 1621 | assert(mapping->mode & MODE_NORMAL); |
| 1622 | |
| 1623 | /* rename */ |
| 1624 | if (strcmp(basename, basename2)) |
| 1625 | schedule_rename(s, cluster_num, strdup(path)); |
| 1626 | } else if (is_file(direntry)) |
| 1627 | /* new file */ |
| 1628 | schedule_new_file(s, strdup(path), cluster_num); |
| 1629 | else { |
| 1630 | assert(0); |
| 1631 | return 0; |
| 1632 | } |
| 1633 | } |
| 1634 | |
| 1635 | while(1) { |
| 1636 | if (s->qcow) { |
| 1637 | if (!copy_it && cluster_was_modified(s, cluster_num)) { |
| 1638 | if (mapping == NULL || |
| 1639 | mapping->begin > cluster_num || |
| 1640 | mapping->end <= cluster_num) |
| 1641 | mapping = find_mapping_for_cluster(s, cluster_num); |
| 1642 | |
| 1643 | |
| 1644 | if (mapping && |
| 1645 | (mapping->mode & MODE_DIRECTORY) == 0) { |
| 1646 | |
| 1647 | /* was modified in qcow */ |
| 1648 | if (offset != mapping->info.file.offset + s->cluster_size |
| 1649 | * (cluster_num - mapping->begin)) { |
| 1650 | /* offset of this cluster in file chain has changed */ |
| 1651 | assert(0); |
| 1652 | copy_it = 1; |
| 1653 | } else if (offset == 0) { |
| 1654 | const char* basename = get_basename(mapping->path); |
| 1655 | |
| 1656 | if (strcmp(basename, basename2)) |
| 1657 | copy_it = 1; |
| 1658 | first_mapping_index = array_index(&(s->mapping), mapping); |
| 1659 | } |
| 1660 | |
| 1661 | if (mapping->first_mapping_index != first_mapping_index |
| 1662 | && mapping->info.file.offset > 0) { |
| 1663 | assert(0); |
| 1664 | copy_it = 1; |
| 1665 | } |
| 1666 | |
| 1667 | /* need to write out? */ |
| 1668 | if (!was_modified && is_file(direntry)) { |
| 1669 | was_modified = 1; |
| 1670 | schedule_writeout(s, mapping->dir_index, offset); |
| 1671 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1672 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1673 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1674 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1675 | if (copy_it) { |
| 1676 | int i, dummy; |
| 1677 | /* |
| 1678 | * This is horribly inefficient, but that is okay, since |
| 1679 | * it is rarely executed, if at all. |
| 1680 | */ |
| 1681 | int64_t offset = cluster2sector(s, cluster_num); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1682 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1683 | vvfat_close_current_file(s); |
| 1684 | for (i = 0; i < s->sectors_per_cluster; i++) |
| 1685 | if (!s->qcow->drv->bdrv_is_allocated(s->qcow, |
| 1686 | offset + i, 1, &dummy)) { |
| 1687 | if (vvfat_read(s->bs, |
| 1688 | offset, s->cluster_buffer, 1)) |
| 1689 | return -1; |
| 1690 | if (s->qcow->drv->bdrv_write(s->qcow, |
| 1691 | offset, s->cluster_buffer, 1)) |
| 1692 | return -2; |
| 1693 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1694 | } |
| 1695 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1696 | |
| 1697 | ret++; |
| 1698 | if (s->used_clusters[cluster_num] & USED_ANY) |
| 1699 | return 0; |
| 1700 | s->used_clusters[cluster_num] = USED_FILE; |
| 1701 | |
| 1702 | cluster_num = modified_fat_get(s, cluster_num); |
| 1703 | |
| 1704 | if (fat_eof(s, cluster_num)) |
| 1705 | return ret; |
| 1706 | else if (cluster_num < 2 || cluster_num > s->max_fat_value - 16) |
| 1707 | return -1; |
| 1708 | |
| 1709 | offset += s->cluster_size; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1710 | } |
| 1711 | } |
| 1712 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1713 | /* |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 1714 | * This function looks at the modified data (qcow). |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1715 | * It returns 0 upon inconsistency or error, and the number of clusters |
| 1716 | * used by the directory, its subdirectories and their files. |
| 1717 | */ |
| 1718 | static int check_directory_consistency(BDRVVVFATState *s, |
| 1719 | int cluster_num, const char* path) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1720 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1721 | int ret = 0; |
| 1722 | unsigned char* cluster = malloc(s->cluster_size); |
| 1723 | direntry_t* direntries = (direntry_t*)cluster; |
| 1724 | mapping_t* mapping = find_mapping_for_cluster(s, cluster_num); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1725 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1726 | long_file_name lfn; |
| 1727 | int path_len = strlen(path); |
| 1728 | char path2[PATH_MAX]; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1729 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1730 | assert(path_len < PATH_MAX); /* len was tested before! */ |
| 1731 | strcpy(path2, path); |
| 1732 | path2[path_len] = '/'; |
| 1733 | path2[path_len + 1] = '\0'; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1734 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1735 | if (mapping) { |
| 1736 | const char* basename = get_basename(mapping->path); |
| 1737 | const char* basename2 = get_basename(path); |
| 1738 | |
| 1739 | assert(mapping->mode & MODE_DIRECTORY); |
| 1740 | |
| 1741 | assert(mapping->mode & MODE_DELETED); |
| 1742 | mapping->mode &= ~MODE_DELETED; |
| 1743 | |
| 1744 | if (strcmp(basename, basename2)) |
| 1745 | schedule_rename(s, cluster_num, strdup(path)); |
| 1746 | } else |
| 1747 | /* new directory */ |
| 1748 | schedule_mkdir(s, cluster_num, strdup(path)); |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 1749 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1750 | lfn_init(&lfn); |
| 1751 | do { |
| 1752 | int i; |
| 1753 | int subret = 0; |
| 1754 | |
| 1755 | ret++; |
| 1756 | |
| 1757 | if (s->used_clusters[cluster_num] & USED_ANY) { |
| 1758 | fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num); |
| 1759 | return 0; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1760 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1761 | s->used_clusters[cluster_num] = USED_DIRECTORY; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1762 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1763 | DLOG(fprintf(stderr, "read cluster %d (sector %d)\n", (int)cluster_num, (int)cluster2sector(s, cluster_num))); |
| 1764 | subret = vvfat_read(s->bs, cluster2sector(s, cluster_num), cluster, |
| 1765 | s->sectors_per_cluster); |
| 1766 | if (subret) { |
| 1767 | fprintf(stderr, "Error fetching direntries\n"); |
| 1768 | fail: |
| 1769 | free(cluster); |
| 1770 | return 0; |
| 1771 | } |
| 1772 | |
| 1773 | for (i = 0; i < 0x10 * s->sectors_per_cluster; i++) { |
| 1774 | int cluster_count; |
| 1775 | |
| 1776 | DLOG(fprintf(stderr, "check direntry %d: \n", i); print_direntry(direntries + i)); |
| 1777 | if (is_volume_label(direntries + i) || is_dot(direntries + i) || |
| 1778 | is_free(direntries + i)) |
| 1779 | continue; |
| 1780 | |
| 1781 | subret = parse_long_name(&lfn, direntries + i); |
| 1782 | if (subret < 0) { |
| 1783 | fprintf(stderr, "Error in long name\n"); |
| 1784 | goto fail; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1785 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1786 | if (subret == 0 || is_free(direntries + i)) |
| 1787 | continue; |
| 1788 | |
| 1789 | if (fat_chksum(direntries+i) != lfn.checksum) { |
| 1790 | subret = parse_short_name(s, &lfn, direntries + i); |
| 1791 | if (subret < 0) { |
| 1792 | fprintf(stderr, "Error in short name (%d)\n", subret); |
| 1793 | goto fail; |
| 1794 | } |
| 1795 | if (subret > 0 || !strcmp(lfn.name, ".") |
| 1796 | || !strcmp(lfn.name, "..")) |
| 1797 | continue; |
| 1798 | } |
| 1799 | lfn.checksum = 0x100; /* cannot use long name twice */ |
| 1800 | |
| 1801 | if (path_len + 1 + lfn.len >= PATH_MAX) { |
| 1802 | fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name); |
| 1803 | goto fail; |
| 1804 | } |
| 1805 | strcpy(path2 + path_len + 1, lfn.name); |
| 1806 | |
| 1807 | if (is_directory(direntries + i)) { |
| 1808 | if (begin_of_direntry(direntries + i) == 0) { |
| 1809 | DLOG(fprintf(stderr, "invalid begin for directory: %s\n", path2); print_direntry(direntries + i)); |
| 1810 | goto fail; |
| 1811 | } |
| 1812 | cluster_count = check_directory_consistency(s, |
| 1813 | begin_of_direntry(direntries + i), path2); |
| 1814 | if (cluster_count == 0) { |
| 1815 | DLOG(fprintf(stderr, "problem in directory %s:\n", path2); print_direntry(direntries + i)); |
| 1816 | goto fail; |
| 1817 | } |
| 1818 | } else if (is_file(direntries + i)) { |
| 1819 | /* check file size with FAT */ |
| 1820 | cluster_count = get_cluster_count_for_direntry(s, direntries + i, path2); |
| 1821 | if (cluster_count != |
| 1822 | (le32_to_cpu(direntries[i].size) + s->cluster_size |
| 1823 | - 1) / s->cluster_size) { |
| 1824 | DLOG(fprintf(stderr, "Cluster count mismatch\n")); |
| 1825 | goto fail; |
| 1826 | } |
| 1827 | } else |
| 1828 | assert(0); /* cluster_count = 0; */ |
| 1829 | |
| 1830 | ret += cluster_count; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1831 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1832 | |
| 1833 | cluster_num = modified_fat_get(s, cluster_num); |
| 1834 | } while(!fat_eof(s, cluster_num)); |
| 1835 | |
| 1836 | free(cluster); |
| 1837 | return ret; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1838 | } |
| 1839 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1840 | /* returns 1 on success */ |
| 1841 | static int is_consistent(BDRVVVFATState* s) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1842 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1843 | int i, check; |
| 1844 | int used_clusters_count = 0; |
| 1845 | |
| 1846 | DLOG(checkpoint()); |
| 1847 | /* |
| 1848 | * - get modified FAT |
| 1849 | * - compare the two FATs (TODO) |
| 1850 | * - get buffer for marking used clusters |
| 1851 | * - recurse direntries from root (using bs->bdrv_read to make |
| 1852 | * sure to get the new data) |
| 1853 | * - check that the FAT agrees with the size |
| 1854 | * - count the number of clusters occupied by this directory and |
| 1855 | * its files |
| 1856 | * - check that the cumulative used cluster count agrees with the |
| 1857 | * FAT |
| 1858 | * - if all is fine, return number of used clusters |
| 1859 | */ |
| 1860 | if (s->fat2 == NULL) { |
| 1861 | int size = 0x200 * s->sectors_per_fat; |
| 1862 | s->fat2 = malloc(size); |
| 1863 | memcpy(s->fat2, s->fat.pointer, size); |
| 1864 | } |
| 1865 | check = vvfat_read(s->bs, |
| 1866 | s->first_sectors_number, s->fat2, s->sectors_per_fat); |
| 1867 | if (check) { |
| 1868 | fprintf(stderr, "Could not copy fat\n"); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1869 | return 0; |
| 1870 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1871 | assert (s->used_clusters); |
| 1872 | for (i = 0; i < sector2cluster(s, s->sector_count); i++) |
| 1873 | s->used_clusters[i] &= ~USED_ANY; |
| 1874 | |
| 1875 | clear_commits(s); |
| 1876 | |
| 1877 | /* mark every mapped file/directory as deleted. |
| 1878 | * (check_directory_consistency() will unmark those still present). */ |
| 1879 | if (s->qcow) |
| 1880 | for (i = 0; i < s->mapping.next; i++) { |
| 1881 | mapping_t* mapping = array_get(&(s->mapping), i); |
| 1882 | if (mapping->first_mapping_index < 0) |
| 1883 | mapping->mode |= MODE_DELETED; |
| 1884 | } |
| 1885 | |
| 1886 | used_clusters_count = check_directory_consistency(s, 0, s->path); |
| 1887 | if (used_clusters_count <= 0) { |
| 1888 | DLOG(fprintf(stderr, "problem in directory\n")); |
| 1889 | return 0; |
| 1890 | } |
| 1891 | |
| 1892 | check = s->last_cluster_of_root_directory; |
| 1893 | for (i = check; i < sector2cluster(s, s->sector_count); i++) { |
| 1894 | if (modified_fat_get(s, i)) { |
| 1895 | if(!s->used_clusters[i]) { |
| 1896 | DLOG(fprintf(stderr, "FAT was modified (%d), but cluster is not used?\n", i)); |
| 1897 | return 0; |
| 1898 | } |
| 1899 | check++; |
| 1900 | } |
| 1901 | |
| 1902 | if (s->used_clusters[i] == USED_ALLOCATED) { |
| 1903 | /* allocated, but not used... */ |
| 1904 | DLOG(fprintf(stderr, "unused, modified cluster: %d\n", i)); |
| 1905 | return 0; |
| 1906 | } |
| 1907 | } |
| 1908 | |
| 1909 | if (check != used_clusters_count) |
| 1910 | return 0; |
| 1911 | |
| 1912 | return used_clusters_count; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1913 | } |
| 1914 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1915 | static inline void adjust_mapping_indices(BDRVVVFATState* s, |
| 1916 | int offset, int adjust) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1917 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1918 | int i; |
| 1919 | |
| 1920 | for (i = 0; i < s->mapping.next; i++) { |
| 1921 | mapping_t* mapping = array_get(&(s->mapping), i); |
| 1922 | |
| 1923 | #define ADJUST_MAPPING_INDEX(name) \ |
| 1924 | if (mapping->name >= offset) \ |
| 1925 | mapping->name += adjust |
| 1926 | |
| 1927 | ADJUST_MAPPING_INDEX(first_mapping_index); |
| 1928 | if (mapping->mode & MODE_DIRECTORY) |
| 1929 | ADJUST_MAPPING_INDEX(info.dir.parent_mapping_index); |
| 1930 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1931 | } |
| 1932 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1933 | /* insert or update mapping */ |
| 1934 | static mapping_t* insert_mapping(BDRVVVFATState* s, |
| 1935 | uint32_t begin, uint32_t end) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1936 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1937 | /* |
| 1938 | * - find mapping where mapping->begin >= begin, |
| 1939 | * - if mapping->begin > begin: insert |
| 1940 | * - adjust all references to mappings! |
| 1941 | * - else: adjust |
| 1942 | * - replace name |
| 1943 | */ |
| 1944 | int index = find_mapping_for_cluster_aux(s, begin, 0, s->mapping.next); |
| 1945 | mapping_t* mapping = NULL; |
| 1946 | mapping_t* first_mapping = array_get(&(s->mapping), 0); |
| 1947 | |
| 1948 | if (index < s->mapping.next && (mapping = array_get(&(s->mapping), index)) |
| 1949 | && mapping->begin < begin) { |
| 1950 | mapping->end = begin; |
| 1951 | index++; |
| 1952 | mapping = array_get(&(s->mapping), index); |
| 1953 | } |
| 1954 | if (index >= s->mapping.next || mapping->begin > begin) { |
| 1955 | mapping = array_insert(&(s->mapping), index, 1); |
| 1956 | mapping->path = NULL; |
| 1957 | adjust_mapping_indices(s, index, +1); |
| 1958 | } |
| 1959 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1960 | mapping->begin = begin; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1961 | mapping->end = end; |
| 1962 | |
| 1963 | DLOG(mapping_t* next_mapping; |
| 1964 | assert(index + 1 >= s->mapping.next || |
| 1965 | ((next_mapping = array_get(&(s->mapping), index + 1)) && |
| 1966 | next_mapping->begin >= end))); |
| 1967 | |
| 1968 | if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer) |
| 1969 | s->current_mapping = array_get(&(s->mapping), |
| 1970 | s->current_mapping - first_mapping); |
| 1971 | |
| 1972 | return mapping; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1973 | } |
| 1974 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1975 | static int remove_mapping(BDRVVVFATState* s, int mapping_index) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1976 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1977 | mapping_t* mapping = array_get(&(s->mapping), mapping_index); |
| 1978 | mapping_t* first_mapping = array_get(&(s->mapping), 0); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1979 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1980 | /* free mapping */ |
| 1981 | if (mapping->first_mapping_index < 0) |
| 1982 | free(mapping->path); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1983 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1984 | /* remove from s->mapping */ |
| 1985 | array_remove(&(s->mapping), mapping_index); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1986 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1987 | /* adjust all references to mappings */ |
| 1988 | adjust_mapping_indices(s, mapping_index, -1); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1989 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1990 | if (s->current_mapping && first_mapping != (mapping_t*)s->mapping.pointer) |
| 1991 | s->current_mapping = array_get(&(s->mapping), |
| 1992 | s->current_mapping - first_mapping); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1993 | |
| 1994 | return 0; |
| 1995 | } |
| 1996 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1997 | static void adjust_dirindices(BDRVVVFATState* s, int offset, int adjust) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 1998 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 1999 | int i; |
| 2000 | for (i = 0; i < s->mapping.next; i++) { |
| 2001 | mapping_t* mapping = array_get(&(s->mapping), i); |
| 2002 | if (mapping->dir_index >= offset) |
| 2003 | mapping->dir_index += adjust; |
| 2004 | if ((mapping->mode & MODE_DIRECTORY) && |
| 2005 | mapping->info.dir.first_dir_index >= offset) |
| 2006 | mapping->info.dir.first_dir_index += adjust; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2007 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2008 | } |
| 2009 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2010 | static direntry_t* insert_direntries(BDRVVVFATState* s, |
| 2011 | int dir_index, int count) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2012 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2013 | /* |
| 2014 | * make room in s->directory, |
| 2015 | * adjust_dirindices |
| 2016 | */ |
| 2017 | direntry_t* result = array_insert(&(s->directory), dir_index, count); |
| 2018 | if (result == NULL) |
| 2019 | return NULL; |
| 2020 | adjust_dirindices(s, dir_index, count); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2021 | return result; |
| 2022 | } |
| 2023 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2024 | static int remove_direntries(BDRVVVFATState* s, int dir_index, int count) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2025 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2026 | int ret = array_remove_slice(&(s->directory), dir_index, count); |
| 2027 | if (ret) |
| 2028 | return ret; |
| 2029 | adjust_dirindices(s, dir_index, -count); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2030 | return 0; |
| 2031 | } |
| 2032 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2033 | /* |
| 2034 | * Adapt the mappings of the cluster chain starting at first cluster |
| 2035 | * (i.e. if a file starts at first_cluster, the chain is followed according |
| 2036 | * to the modified fat, and the corresponding entries in s->mapping are |
| 2037 | * adjusted) |
| 2038 | */ |
| 2039 | static int commit_mappings(BDRVVVFATState* s, |
| 2040 | uint32_t first_cluster, int dir_index) |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2041 | { |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2042 | mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
| 2043 | direntry_t* direntry = array_get(&(s->directory), dir_index); |
| 2044 | uint32_t cluster = first_cluster; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2045 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2046 | vvfat_close_current_file(s); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2047 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2048 | assert(mapping); |
| 2049 | assert(mapping->begin == first_cluster); |
| 2050 | mapping->first_mapping_index = -1; |
| 2051 | mapping->dir_index = dir_index; |
| 2052 | mapping->mode = (dir_index <= 0 || is_directory(direntry)) ? |
| 2053 | MODE_DIRECTORY : MODE_NORMAL; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2054 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2055 | while (!fat_eof(s, cluster)) { |
| 2056 | uint32_t c, c1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2057 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2058 | for (c = cluster, c1 = modified_fat_get(s, c); c + 1 == c1; |
| 2059 | c = c1, c1 = modified_fat_get(s, c1)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2060 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2061 | c++; |
| 2062 | if (c > mapping->end) { |
| 2063 | int index = array_index(&(s->mapping), mapping); |
| 2064 | int i, max_i = s->mapping.next - index; |
| 2065 | for (i = 1; i < max_i && mapping[i].begin < c; i++); |
| 2066 | while (--i > 0) |
| 2067 | remove_mapping(s, index + 1); |
| 2068 | } |
| 2069 | assert(mapping == array_get(&(s->mapping), s->mapping.next - 1) |
| 2070 | || mapping[1].begin >= c); |
| 2071 | mapping->end = c; |
| 2072 | |
| 2073 | if (!fat_eof(s, c1)) { |
| 2074 | int i = find_mapping_for_cluster_aux(s, c1, 0, s->mapping.next); |
| 2075 | mapping_t* next_mapping = i >= s->mapping.next ? NULL : |
| 2076 | array_get(&(s->mapping), i); |
| 2077 | |
| 2078 | if (next_mapping == NULL || next_mapping->begin > c1) { |
| 2079 | int i1 = array_index(&(s->mapping), mapping); |
| 2080 | |
| 2081 | next_mapping = insert_mapping(s, c1, c1+1); |
| 2082 | |
| 2083 | if (c1 < c) |
| 2084 | i1++; |
| 2085 | mapping = array_get(&(s->mapping), i1); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2086 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2087 | |
| 2088 | next_mapping->dir_index = mapping->dir_index; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2089 | next_mapping->first_mapping_index = |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2090 | mapping->first_mapping_index < 0 ? |
| 2091 | array_index(&(s->mapping), mapping) : |
| 2092 | mapping->first_mapping_index; |
| 2093 | next_mapping->path = mapping->path; |
| 2094 | next_mapping->mode = mapping->mode; |
| 2095 | next_mapping->read_only = mapping->read_only; |
| 2096 | if (mapping->mode & MODE_DIRECTORY) { |
| 2097 | next_mapping->info.dir.parent_mapping_index = |
| 2098 | mapping->info.dir.parent_mapping_index; |
| 2099 | next_mapping->info.dir.first_dir_index = |
| 2100 | mapping->info.dir.first_dir_index + |
| 2101 | 0x10 * s->sectors_per_cluster * |
| 2102 | (mapping->end - mapping->begin); |
| 2103 | } else |
| 2104 | next_mapping->info.file.offset = mapping->info.file.offset + |
| 2105 | mapping->end - mapping->begin; |
| 2106 | |
| 2107 | mapping = next_mapping; |
| 2108 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 2109 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2110 | cluster = c1; |
| 2111 | } |
| 2112 | |
| 2113 | return 0; |
| 2114 | } |
| 2115 | |
| 2116 | static int commit_direntries(BDRVVVFATState* s, |
| 2117 | int dir_index, int parent_mapping_index) |
| 2118 | { |
| 2119 | direntry_t* direntry = array_get(&(s->directory), dir_index); |
| 2120 | uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry); |
| 2121 | mapping_t* mapping = find_mapping_for_cluster(s, first_cluster); |
| 2122 | |
| 2123 | int factor = 0x10 * s->sectors_per_cluster; |
| 2124 | int old_cluster_count, new_cluster_count; |
| 2125 | int current_dir_index = mapping->info.dir.first_dir_index; |
| 2126 | int first_dir_index = current_dir_index; |
| 2127 | int ret, i; |
| 2128 | uint32_t c; |
| 2129 | |
| 2130 | DLOG(fprintf(stderr, "commit_direntries for %s, parent_mapping_index %d\n", mapping->path, parent_mapping_index)); |
| 2131 | |
| 2132 | assert(direntry); |
| 2133 | assert(mapping); |
| 2134 | assert(mapping->begin == first_cluster); |
| 2135 | assert(mapping->info.dir.first_dir_index < s->directory.next); |
| 2136 | assert(mapping->mode & MODE_DIRECTORY); |
| 2137 | assert(dir_index == 0 || is_directory(direntry)); |
| 2138 | |
| 2139 | mapping->info.dir.parent_mapping_index = parent_mapping_index; |
| 2140 | |
| 2141 | if (first_cluster == 0) { |
| 2142 | old_cluster_count = new_cluster_count = |
| 2143 | s->last_cluster_of_root_directory; |
| 2144 | } else { |
| 2145 | for (old_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
| 2146 | c = fat_get(s, c)) |
| 2147 | old_cluster_count++; |
| 2148 | |
| 2149 | for (new_cluster_count = 0, c = first_cluster; !fat_eof(s, c); |
| 2150 | c = modified_fat_get(s, c)) |
| 2151 | new_cluster_count++; |
| 2152 | } |
| 2153 | |
| 2154 | if (new_cluster_count > old_cluster_count) { |
| 2155 | if (insert_direntries(s, |
| 2156 | current_dir_index + factor * old_cluster_count, |
| 2157 | factor * (new_cluster_count - old_cluster_count)) == NULL) |
| 2158 | return -1; |
| 2159 | } else if (new_cluster_count < old_cluster_count) |
| 2160 | remove_direntries(s, |
| 2161 | current_dir_index + factor * new_cluster_count, |
| 2162 | factor * (old_cluster_count - new_cluster_count)); |
| 2163 | |
| 2164 | for (c = first_cluster; !fat_eof(s, c); c = modified_fat_get(s, c)) { |
| 2165 | void* direntry = array_get(&(s->directory), current_dir_index); |
| 2166 | int ret = vvfat_read(s->bs, cluster2sector(s, c), direntry, |
| 2167 | s->sectors_per_cluster); |
| 2168 | if (ret) |
| 2169 | return ret; |
| 2170 | assert(!strncmp(s->directory.pointer, "QEMU", 4)); |
| 2171 | current_dir_index += factor; |
| 2172 | } |
| 2173 | |
| 2174 | ret = commit_mappings(s, first_cluster, dir_index); |
| 2175 | if (ret) |
| 2176 | return ret; |
| 2177 | |
| 2178 | /* recurse */ |
| 2179 | for (i = 0; i < factor * new_cluster_count; i++) { |
| 2180 | direntry = array_get(&(s->directory), first_dir_index + i); |
| 2181 | if (is_directory(direntry) && !is_dot(direntry)) { |
| 2182 | mapping = find_mapping_for_cluster(s, first_cluster); |
| 2183 | assert(mapping->mode & MODE_DIRECTORY); |
| 2184 | ret = commit_direntries(s, first_dir_index + i, |
| 2185 | array_index(&(s->mapping), mapping)); |
| 2186 | if (ret) |
| 2187 | return ret; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2188 | } |
| 2189 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2190 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2191 | return 0; |
| 2192 | } |
| 2193 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2194 | /* commit one file (adjust contents, adjust mapping), |
| 2195 | return first_mapping_index */ |
| 2196 | static int commit_one_file(BDRVVVFATState* s, |
| 2197 | int dir_index, uint32_t offset) |
| 2198 | { |
| 2199 | direntry_t* direntry = array_get(&(s->directory), dir_index); |
| 2200 | uint32_t c = begin_of_direntry(direntry); |
| 2201 | uint32_t first_cluster = c; |
| 2202 | mapping_t* mapping = find_mapping_for_cluster(s, c); |
| 2203 | uint32_t size = filesize_of_direntry(direntry); |
| 2204 | char* cluster = malloc(s->cluster_size); |
| 2205 | uint32_t i; |
| 2206 | int fd = 0; |
| 2207 | |
| 2208 | assert(offset < size); |
| 2209 | assert((offset % s->cluster_size) == 0); |
| 2210 | |
| 2211 | for (i = s->cluster_size; i < offset; i += s->cluster_size) |
| 2212 | c = modified_fat_get(s, c); |
| 2213 | |
bellard | 6bcb76c | 2006-09-09 12:03:20 +0000 | [diff] [blame] | 2214 | fd = open(mapping->path, O_RDWR | O_CREAT | O_BINARY, 0666); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2215 | if (fd < 0) { |
| 2216 | fprintf(stderr, "Could not open %s... (%s, %d)\n", mapping->path, |
| 2217 | strerror(errno), errno); |
| 2218 | return fd; |
| 2219 | } |
| 2220 | if (offset > 0) |
| 2221 | if (lseek(fd, offset, SEEK_SET) != offset) |
| 2222 | return -3; |
| 2223 | |
| 2224 | while (offset < size) { |
| 2225 | uint32_t c1; |
| 2226 | int rest_size = (size - offset > s->cluster_size ? |
| 2227 | s->cluster_size : size - offset); |
| 2228 | int ret; |
| 2229 | |
| 2230 | c1 = modified_fat_get(s, c); |
| 2231 | |
| 2232 | assert((size - offset == 0 && fat_eof(s, c)) || |
| 2233 | (size > offset && c >=2 && !fat_eof(s, c))); |
| 2234 | assert(size >= 0); |
| 2235 | |
| 2236 | ret = vvfat_read(s->bs, cluster2sector(s, c), |
| 2237 | cluster, (rest_size + 0x1ff) / 0x200); |
| 2238 | |
| 2239 | if (ret < 0) |
| 2240 | return ret; |
| 2241 | |
| 2242 | if (write(fd, cluster, rest_size) < 0) |
| 2243 | return -2; |
| 2244 | |
| 2245 | offset += rest_size; |
| 2246 | c = c1; |
| 2247 | } |
| 2248 | |
| 2249 | ftruncate(fd, size); |
| 2250 | close(fd); |
| 2251 | |
| 2252 | return commit_mappings(s, first_cluster, dir_index); |
| 2253 | } |
| 2254 | |
| 2255 | #ifdef DEBUG |
| 2256 | /* test, if all mappings point to valid direntries */ |
| 2257 | static void check1(BDRVVVFATState* s) |
| 2258 | { |
| 2259 | int i; |
| 2260 | for (i = 0; i < s->mapping.next; i++) { |
| 2261 | mapping_t* mapping = array_get(&(s->mapping), i); |
| 2262 | if (mapping->mode & MODE_DELETED) { |
| 2263 | fprintf(stderr, "deleted\n"); |
| 2264 | continue; |
| 2265 | } |
| 2266 | assert(mapping->dir_index >= 0); |
| 2267 | assert(mapping->dir_index < s->directory.next); |
| 2268 | direntry_t* direntry = array_get(&(s->directory), mapping->dir_index); |
| 2269 | assert(mapping->begin == begin_of_direntry(direntry) || mapping->first_mapping_index >= 0); |
| 2270 | if (mapping->mode & MODE_DIRECTORY) { |
| 2271 | assert(mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster * (mapping->end - mapping->begin) <= s->directory.next); |
| 2272 | assert((mapping->info.dir.first_dir_index % (0x10 * s->sectors_per_cluster)) == 0); |
| 2273 | } |
| 2274 | } |
| 2275 | } |
| 2276 | |
| 2277 | /* test, if all direntries have mappings */ |
| 2278 | static void check2(BDRVVVFATState* s) |
| 2279 | { |
| 2280 | int i; |
| 2281 | int first_mapping = -1; |
| 2282 | |
| 2283 | for (i = 0; i < s->directory.next; i++) { |
| 2284 | direntry_t* direntry = array_get(&(s->directory), i); |
| 2285 | |
| 2286 | if (is_short_name(direntry) && begin_of_direntry(direntry)) { |
| 2287 | mapping_t* mapping = find_mapping_for_cluster(s, begin_of_direntry(direntry)); |
| 2288 | assert(mapping); |
| 2289 | assert(mapping->dir_index == i || is_dot(direntry)); |
| 2290 | assert(mapping->begin == begin_of_direntry(direntry) || is_dot(direntry)); |
| 2291 | } |
| 2292 | |
| 2293 | if ((i % (0x10 * s->sectors_per_cluster)) == 0) { |
| 2294 | /* cluster start */ |
| 2295 | int j, count = 0; |
| 2296 | |
| 2297 | for (j = 0; j < s->mapping.next; j++) { |
| 2298 | mapping_t* mapping = array_get(&(s->mapping), j); |
| 2299 | if (mapping->mode & MODE_DELETED) |
| 2300 | continue; |
| 2301 | if (mapping->mode & MODE_DIRECTORY) { |
| 2302 | if (mapping->info.dir.first_dir_index <= i && mapping->info.dir.first_dir_index + 0x10 * s->sectors_per_cluster > i) { |
| 2303 | assert(++count == 1); |
| 2304 | if (mapping->first_mapping_index == -1) |
| 2305 | first_mapping = array_index(&(s->mapping), mapping); |
| 2306 | else |
| 2307 | assert(first_mapping == mapping->first_mapping_index); |
| 2308 | if (mapping->info.dir.parent_mapping_index < 0) |
| 2309 | assert(j == 0); |
| 2310 | else { |
| 2311 | mapping_t* parent = array_get(&(s->mapping), mapping->info.dir.parent_mapping_index); |
| 2312 | assert(parent->mode & MODE_DIRECTORY); |
| 2313 | assert(parent->info.dir.first_dir_index < mapping->info.dir.first_dir_index); |
| 2314 | } |
| 2315 | } |
| 2316 | } |
| 2317 | } |
| 2318 | if (count == 0) |
| 2319 | first_mapping = -1; |
| 2320 | } |
| 2321 | } |
| 2322 | } |
| 2323 | #endif |
| 2324 | |
| 2325 | static int handle_renames_and_mkdirs(BDRVVVFATState* s) |
| 2326 | { |
| 2327 | int i; |
| 2328 | |
| 2329 | #ifdef DEBUG |
| 2330 | fprintf(stderr, "handle_renames\n"); |
| 2331 | for (i = 0; i < s->commits.next; i++) { |
| 2332 | commit_t* commit = array_get(&(s->commits), i); |
| 2333 | fprintf(stderr, "%d, %s (%d, %d)\n", i, commit->path ? commit->path : "(null)", commit->param.rename.cluster, commit->action); |
| 2334 | } |
| 2335 | #endif |
| 2336 | |
| 2337 | for (i = 0; i < s->commits.next;) { |
| 2338 | commit_t* commit = array_get(&(s->commits), i); |
| 2339 | if (commit->action == ACTION_RENAME) { |
| 2340 | mapping_t* mapping = find_mapping_for_cluster(s, |
| 2341 | commit->param.rename.cluster); |
| 2342 | char* old_path = mapping->path; |
| 2343 | |
| 2344 | assert(commit->path); |
| 2345 | mapping->path = commit->path; |
| 2346 | if (rename(old_path, mapping->path)) |
| 2347 | return -2; |
| 2348 | |
| 2349 | if (mapping->mode & MODE_DIRECTORY) { |
| 2350 | int l1 = strlen(mapping->path); |
| 2351 | int l2 = strlen(old_path); |
| 2352 | int diff = l1 - l2; |
| 2353 | direntry_t* direntry = array_get(&(s->directory), |
| 2354 | mapping->info.dir.first_dir_index); |
| 2355 | uint32_t c = mapping->begin; |
| 2356 | int i = 0; |
| 2357 | |
| 2358 | /* recurse */ |
| 2359 | while (!fat_eof(s, c)) { |
| 2360 | do { |
| 2361 | direntry_t* d = direntry + i; |
| 2362 | |
| 2363 | if (is_file(d) || (is_directory(d) && !is_dot(d))) { |
| 2364 | mapping_t* m = find_mapping_for_cluster(s, |
| 2365 | begin_of_direntry(d)); |
| 2366 | int l = strlen(m->path); |
| 2367 | char* new_path = malloc(l + diff + 1); |
| 2368 | |
| 2369 | assert(!strncmp(m->path, mapping->path, l2)); |
| 2370 | |
| 2371 | strcpy(new_path, mapping->path); |
| 2372 | strcpy(new_path + l1, m->path + l2); |
| 2373 | |
| 2374 | schedule_rename(s, m->begin, new_path); |
| 2375 | } |
| 2376 | i++; |
| 2377 | } while((i % (0x10 * s->sectors_per_cluster)) != 0); |
| 2378 | c = fat_get(s, c); |
| 2379 | } |
| 2380 | } |
| 2381 | |
| 2382 | free(old_path); |
| 2383 | array_remove(&(s->commits), i); |
| 2384 | continue; |
| 2385 | } else if (commit->action == ACTION_MKDIR) { |
| 2386 | mapping_t* mapping; |
| 2387 | int j, parent_path_len; |
| 2388 | |
bellard | 48c2f06 | 2005-12-19 22:11:49 +0000 | [diff] [blame] | 2389 | #ifdef __MINGW32__ |
| 2390 | if (mkdir(commit->path)) |
| 2391 | return -5; |
| 2392 | #else |
| 2393 | if (mkdir(commit->path, 0755)) |
| 2394 | return -5; |
| 2395 | #endif |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2396 | |
| 2397 | mapping = insert_mapping(s, commit->param.mkdir.cluster, |
| 2398 | commit->param.mkdir.cluster + 1); |
| 2399 | if (mapping == NULL) |
| 2400 | return -6; |
| 2401 | |
| 2402 | mapping->mode = MODE_DIRECTORY; |
| 2403 | mapping->read_only = 0; |
| 2404 | mapping->path = commit->path; |
| 2405 | j = s->directory.next; |
| 2406 | assert(j); |
| 2407 | insert_direntries(s, s->directory.next, |
| 2408 | 0x10 * s->sectors_per_cluster); |
| 2409 | mapping->info.dir.first_dir_index = j; |
| 2410 | |
| 2411 | parent_path_len = strlen(commit->path) |
| 2412 | - strlen(get_basename(commit->path)) - 1; |
| 2413 | for (j = 0; j < s->mapping.next; j++) { |
| 2414 | mapping_t* m = array_get(&(s->mapping), j); |
| 2415 | if (m->first_mapping_index < 0 && m != mapping && |
| 2416 | !strncmp(m->path, mapping->path, parent_path_len) && |
| 2417 | strlen(m->path) == parent_path_len) |
| 2418 | break; |
| 2419 | } |
| 2420 | assert(j < s->mapping.next); |
| 2421 | mapping->info.dir.parent_mapping_index = j; |
| 2422 | |
| 2423 | array_remove(&(s->commits), i); |
| 2424 | continue; |
| 2425 | } |
| 2426 | |
| 2427 | i++; |
| 2428 | } |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
| 2432 | /* |
| 2433 | * TODO: make sure that the short name is not matching *another* file |
| 2434 | */ |
| 2435 | static int handle_commits(BDRVVVFATState* s) |
| 2436 | { |
| 2437 | int i, fail = 0; |
| 2438 | |
| 2439 | vvfat_close_current_file(s); |
| 2440 | |
| 2441 | for (i = 0; !fail && i < s->commits.next; i++) { |
| 2442 | commit_t* commit = array_get(&(s->commits), i); |
| 2443 | switch(commit->action) { |
| 2444 | case ACTION_RENAME: case ACTION_MKDIR: |
| 2445 | assert(0); |
| 2446 | fail = -2; |
| 2447 | break; |
| 2448 | case ACTION_WRITEOUT: { |
| 2449 | direntry_t* entry = array_get(&(s->directory), |
| 2450 | commit->param.writeout.dir_index); |
| 2451 | uint32_t begin = begin_of_direntry(entry); |
| 2452 | mapping_t* mapping = find_mapping_for_cluster(s, begin); |
| 2453 | |
| 2454 | assert(mapping); |
| 2455 | assert(mapping->begin == begin); |
| 2456 | assert(commit->path == NULL); |
| 2457 | |
| 2458 | if (commit_one_file(s, commit->param.writeout.dir_index, |
| 2459 | commit->param.writeout.modified_offset)) |
| 2460 | fail = -3; |
| 2461 | |
| 2462 | break; |
| 2463 | } |
| 2464 | case ACTION_NEW_FILE: { |
| 2465 | int begin = commit->param.new_file.first_cluster; |
| 2466 | mapping_t* mapping = find_mapping_for_cluster(s, begin); |
| 2467 | direntry_t* entry; |
| 2468 | int i; |
| 2469 | |
| 2470 | /* find direntry */ |
| 2471 | for (i = 0; i < s->directory.next; i++) { |
| 2472 | entry = array_get(&(s->directory), i); |
| 2473 | if (is_file(entry) && begin_of_direntry(entry) == begin) |
| 2474 | break; |
| 2475 | } |
| 2476 | |
| 2477 | if (i >= s->directory.next) { |
| 2478 | fail = -6; |
| 2479 | continue; |
| 2480 | } |
| 2481 | |
| 2482 | /* make sure there exists an initial mapping */ |
| 2483 | if (mapping && mapping->begin != begin) { |
| 2484 | mapping->end = begin; |
| 2485 | mapping = NULL; |
| 2486 | } |
| 2487 | if (mapping == NULL) { |
| 2488 | mapping = insert_mapping(s, begin, begin+1); |
| 2489 | } |
| 2490 | /* most members will be fixed in commit_mappings() */ |
| 2491 | assert(commit->path); |
| 2492 | mapping->path = commit->path; |
| 2493 | mapping->read_only = 0; |
| 2494 | mapping->mode = MODE_NORMAL; |
| 2495 | mapping->info.file.offset = 0; |
| 2496 | |
| 2497 | if (commit_one_file(s, i, 0)) |
| 2498 | fail = -7; |
| 2499 | |
| 2500 | break; |
| 2501 | } |
| 2502 | default: |
| 2503 | assert(0); |
| 2504 | } |
| 2505 | } |
| 2506 | if (i > 0 && array_remove_slice(&(s->commits), 0, i)) |
| 2507 | return -1; |
| 2508 | return fail; |
| 2509 | } |
| 2510 | |
| 2511 | static int handle_deletes(BDRVVVFATState* s) |
| 2512 | { |
| 2513 | int i, deferred = 1, deleted = 1; |
| 2514 | |
| 2515 | /* delete files corresponding to mappings marked as deleted */ |
| 2516 | /* handle DELETEs and unused mappings (modified_fat_get(s, mapping->begin) == 0) */ |
| 2517 | while (deferred && deleted) { |
| 2518 | deferred = 0; |
| 2519 | deleted = 0; |
| 2520 | |
| 2521 | for (i = 1; i < s->mapping.next; i++) { |
| 2522 | mapping_t* mapping = array_get(&(s->mapping), i); |
| 2523 | if (mapping->mode & MODE_DELETED) { |
| 2524 | direntry_t* entry = array_get(&(s->directory), |
| 2525 | mapping->dir_index); |
| 2526 | |
| 2527 | if (is_free(entry)) { |
| 2528 | /* remove file/directory */ |
| 2529 | if (mapping->mode & MODE_DIRECTORY) { |
| 2530 | int j, next_dir_index = s->directory.next, |
| 2531 | first_dir_index = mapping->info.dir.first_dir_index; |
| 2532 | |
| 2533 | if (rmdir(mapping->path) < 0) { |
| 2534 | if (errno == ENOTEMPTY) { |
| 2535 | deferred++; |
| 2536 | continue; |
| 2537 | } else |
| 2538 | return -5; |
| 2539 | } |
| 2540 | |
| 2541 | for (j = 1; j < s->mapping.next; j++) { |
| 2542 | mapping_t* m = array_get(&(s->mapping), j); |
| 2543 | if (m->mode & MODE_DIRECTORY && |
| 2544 | m->info.dir.first_dir_index > |
| 2545 | first_dir_index && |
| 2546 | m->info.dir.first_dir_index < |
| 2547 | next_dir_index) |
| 2548 | next_dir_index = |
| 2549 | m->info.dir.first_dir_index; |
| 2550 | } |
| 2551 | remove_direntries(s, first_dir_index, |
| 2552 | next_dir_index - first_dir_index); |
| 2553 | |
| 2554 | deleted++; |
| 2555 | } |
| 2556 | } else { |
| 2557 | if (unlink(mapping->path)) |
| 2558 | return -4; |
| 2559 | deleted++; |
| 2560 | } |
| 2561 | DLOG(fprintf(stderr, "DELETE (%d)\n", i); print_mapping(mapping); print_direntry(entry)); |
| 2562 | remove_mapping(s, i); |
| 2563 | } |
| 2564 | } |
| 2565 | } |
| 2566 | |
| 2567 | return 0; |
| 2568 | } |
| 2569 | |
| 2570 | /* |
| 2571 | * synchronize mapping with new state: |
| 2572 | * |
| 2573 | * - copy FAT (with bdrv_read) |
| 2574 | * - mark all filenames corresponding to mappings as deleted |
| 2575 | * - recurse direntries from root (using bs->bdrv_read) |
| 2576 | * - delete files corresponding to mappings marked as deleted |
| 2577 | */ |
| 2578 | static int do_commit(BDRVVVFATState* s) |
| 2579 | { |
| 2580 | int ret = 0; |
| 2581 | |
| 2582 | /* the real meat are the commits. Nothing to do? Move along! */ |
| 2583 | if (s->commits.next == 0) |
| 2584 | return 0; |
| 2585 | |
| 2586 | vvfat_close_current_file(s); |
| 2587 | |
| 2588 | ret = handle_renames_and_mkdirs(s); |
| 2589 | if (ret) { |
| 2590 | fprintf(stderr, "Error handling renames (%d)\n", ret); |
| 2591 | assert(0); |
| 2592 | return ret; |
| 2593 | } |
| 2594 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2595 | /* copy FAT (with bdrv_read) */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2596 | memcpy(s->fat.pointer, s->fat2, 0x200 * s->sectors_per_fat); |
| 2597 | |
| 2598 | /* recurse direntries from root (using bs->bdrv_read) */ |
| 2599 | ret = commit_direntries(s, 0, -1); |
| 2600 | if (ret) { |
| 2601 | fprintf(stderr, "Fatal: error while committing (%d)\n", ret); |
| 2602 | assert(0); |
| 2603 | return ret; |
| 2604 | } |
| 2605 | |
| 2606 | ret = handle_commits(s); |
| 2607 | if (ret) { |
| 2608 | fprintf(stderr, "Error handling commits (%d)\n", ret); |
| 2609 | assert(0); |
| 2610 | return ret; |
| 2611 | } |
| 2612 | |
| 2613 | ret = handle_deletes(s); |
| 2614 | if (ret) { |
| 2615 | fprintf(stderr, "Error deleting\n"); |
| 2616 | assert(0); |
| 2617 | return ret; |
| 2618 | } |
| 2619 | |
| 2620 | s->qcow->drv->bdrv_make_empty(s->qcow); |
| 2621 | |
| 2622 | memset(s->used_clusters, 0, sector2cluster(s, s->sector_count)); |
| 2623 | |
| 2624 | DLOG(checkpoint()); |
| 2625 | return 0; |
| 2626 | } |
| 2627 | |
| 2628 | static int try_commit(BDRVVVFATState* s) |
| 2629 | { |
| 2630 | vvfat_close_current_file(s); |
| 2631 | DLOG(checkpoint()); |
| 2632 | if(!is_consistent(s)) |
| 2633 | return -1; |
| 2634 | return do_commit(s); |
| 2635 | } |
| 2636 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2637 | static int vvfat_write(BlockDriverState *bs, int64_t sector_num, |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2638 | const uint8_t *buf, int nb_sectors) |
| 2639 | { |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2640 | BDRVVVFATState *s = bs->opaque; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2641 | int i, ret; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2642 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2643 | DLOG(checkpoint()); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2644 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2645 | vvfat_close_current_file(s); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2646 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2647 | /* |
| 2648 | * Some sanity checks: |
| 2649 | * - do not allow writing to the boot sector |
| 2650 | * - do not allow to write non-ASCII filenames |
| 2651 | */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2652 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2653 | if (sector_num < s->first_sectors_number) |
| 2654 | return -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2655 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2656 | for (i = sector2cluster(s, sector_num); |
| 2657 | i <= sector2cluster(s, sector_num + nb_sectors - 1);) { |
| 2658 | mapping_t* mapping = find_mapping_for_cluster(s, i); |
| 2659 | if (mapping) { |
| 2660 | if (mapping->read_only) { |
| 2661 | fprintf(stderr, "Tried to write to write-protected file %s\n", |
| 2662 | mapping->path); |
| 2663 | return -1; |
| 2664 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2665 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2666 | if (mapping->mode & MODE_DIRECTORY) { |
| 2667 | int begin = cluster2sector(s, i); |
| 2668 | int end = begin + s->sectors_per_cluster, k; |
| 2669 | int dir_index; |
| 2670 | const direntry_t* direntries; |
| 2671 | long_file_name lfn; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2672 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2673 | lfn_init(&lfn); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2674 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2675 | if (begin < sector_num) |
| 2676 | begin = sector_num; |
| 2677 | if (end > sector_num + nb_sectors) |
| 2678 | end = sector_num + nb_sectors; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2679 | dir_index = mapping->dir_index + |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2680 | 0x10 * (begin - mapping->begin * s->sectors_per_cluster); |
| 2681 | direntries = (direntry_t*)(buf + 0x200 * (begin - sector_num)); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2682 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2683 | for (k = 0; k < (end - begin) * 0x10; k++) { |
| 2684 | /* do not allow non-ASCII filenames */ |
| 2685 | if (parse_long_name(&lfn, direntries + k) < 0) { |
| 2686 | fprintf(stderr, "Warning: non-ASCII filename\n"); |
| 2687 | return -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2688 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2689 | /* no access to the direntry of a read-only file */ |
| 2690 | else if (is_short_name(direntries+k) && |
| 2691 | (direntries[k].attributes & 1)) { |
| 2692 | if (memcmp(direntries + k, |
| 2693 | array_get(&(s->directory), dir_index + k), |
| 2694 | sizeof(direntry_t))) { |
| 2695 | fprintf(stderr, "Warning: tried to write to write-protected file\n"); |
| 2696 | return -1; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2697 | } |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2698 | } |
| 2699 | } |
| 2700 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2701 | i = mapping->end; |
| 2702 | } else |
| 2703 | i++; |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2704 | } |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2705 | |
| 2706 | /* |
| 2707 | * Use qcow backend. Commit later. |
| 2708 | */ |
| 2709 | DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors)); |
| 2710 | ret = s->qcow->drv->bdrv_write(s->qcow, sector_num, buf, nb_sectors); |
| 2711 | if (ret < 0) { |
| 2712 | fprintf(stderr, "Error writing to qcow backend\n"); |
| 2713 | return ret; |
| 2714 | } |
| 2715 | |
| 2716 | for (i = sector2cluster(s, sector_num); |
| 2717 | i <= sector2cluster(s, sector_num + nb_sectors - 1); i++) |
| 2718 | if (i >= 0) |
| 2719 | s->used_clusters[i] |= USED_ALLOCATED; |
| 2720 | |
| 2721 | DLOG(checkpoint()); |
| 2722 | /* TODO: add timeout */ |
| 2723 | try_commit(s); |
| 2724 | |
| 2725 | DLOG(checkpoint()); |
| 2726 | return 0; |
| 2727 | } |
| 2728 | |
| 2729 | static int vvfat_is_allocated(BlockDriverState *bs, |
| 2730 | int64_t sector_num, int nb_sectors, int* n) |
| 2731 | { |
| 2732 | BDRVVVFATState* s = bs->opaque; |
| 2733 | *n = s->sector_count - sector_num; |
| 2734 | if (*n > nb_sectors) |
| 2735 | *n = nb_sectors; |
| 2736 | else if (*n < 0) |
| 2737 | return 0; |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2738 | return 1; |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2739 | } |
| 2740 | |
| 2741 | static int write_target_commit(BlockDriverState *bs, int64_t sector_num, |
| 2742 | const uint8_t* buffer, int nb_sectors) { |
| 2743 | BDRVVVFATState* s = bs->opaque; |
| 2744 | return try_commit(s); |
| 2745 | } |
| 2746 | |
| 2747 | static void write_target_close(BlockDriverState *bs) { |
| 2748 | BDRVVVFATState* s = bs->opaque; |
| 2749 | bdrv_delete(s->qcow); |
| 2750 | free(s->qcow_filename); |
| 2751 | } |
| 2752 | |
| 2753 | static BlockDriver vvfat_write_target = { |
| 2754 | "vvfat_write_target", 0, NULL, NULL, NULL, |
| 2755 | write_target_commit, |
| 2756 | write_target_close, |
| 2757 | NULL, NULL, NULL |
| 2758 | }; |
| 2759 | |
| 2760 | static int enable_write_target(BDRVVVFATState *s) |
| 2761 | { |
| 2762 | int size = sector2cluster(s, s->sector_count); |
| 2763 | s->used_clusters = calloc(size, 1); |
| 2764 | |
| 2765 | array_init(&(s->commits), sizeof(commit_t)); |
| 2766 | |
| 2767 | s->qcow_filename = malloc(1024); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2768 | get_tmp_filename(s->qcow_filename, 1024); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2769 | if (bdrv_create(&bdrv_qcow, |
| 2770 | s->qcow_filename, s->sector_count, "fat:", 0) < 0) |
| 2771 | return -1; |
| 2772 | s->qcow = bdrv_new(""); |
| 2773 | if (s->qcow == NULL || bdrv_open(s->qcow, s->qcow_filename, 0) < 0) |
| 2774 | return -1; |
| 2775 | |
| 2776 | #ifndef _WIN32 |
| 2777 | unlink(s->qcow_filename); |
| 2778 | #endif |
| 2779 | |
| 2780 | s->bs->backing_hd = calloc(sizeof(BlockDriverState), 1); |
| 2781 | s->bs->backing_hd->drv = &vvfat_write_target; |
| 2782 | s->bs->backing_hd->opaque = s; |
| 2783 | |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2784 | return 0; |
| 2785 | } |
| 2786 | |
| 2787 | static void vvfat_close(BlockDriverState *bs) |
| 2788 | { |
| 2789 | BDRVVVFATState *s = bs->opaque; |
| 2790 | |
| 2791 | vvfat_close_current_file(s); |
| 2792 | array_free(&(s->fat)); |
| 2793 | array_free(&(s->directory)); |
| 2794 | array_free(&(s->mapping)); |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2795 | if(s->cluster_buffer) |
| 2796 | free(s->cluster_buffer); |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2797 | } |
| 2798 | |
| 2799 | BlockDriver bdrv_vvfat = { |
| 2800 | "vvfat", |
| 2801 | sizeof(BDRVVVFATState), |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2802 | NULL, /* no probe for protocols */ |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2803 | vvfat_open, |
| 2804 | vvfat_read, |
| 2805 | vvfat_write, |
| 2806 | vvfat_close, |
pbrook | 7a6cba6 | 2006-06-04 11:39:07 +0000 | [diff] [blame] | 2807 | NULL, /* ??? Not sure if we can do any meaningful flushing. */ |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2808 | NULL, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2809 | vvfat_is_allocated, |
| 2810 | .protocol_name = "fat", |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2811 | }; |
| 2812 | |
bellard | a046433 | 2005-12-18 18:29:50 +0000 | [diff] [blame] | 2813 | #ifdef DEBUG |
| 2814 | static void checkpoint() { |
| 2815 | assert(((mapping_t*)array_get(&(vvv->mapping), 0))->end == 2); |
| 2816 | check1(vvv); |
| 2817 | check2(vvv); |
| 2818 | assert(!vvv->current_mapping || vvv->current_fd || (vvv->current_mapping->mode & MODE_DIRECTORY)); |
| 2819 | #if 0 |
| 2820 | if (((direntry_t*)vvv->directory.pointer)[1].attributes != 0xf) |
| 2821 | fprintf(stderr, "Nonono!\n"); |
| 2822 | mapping_t* mapping; |
| 2823 | direntry_t* direntry; |
| 2824 | assert(vvv->mapping.size >= vvv->mapping.item_size * vvv->mapping.next); |
| 2825 | assert(vvv->directory.size >= vvv->directory.item_size * vvv->directory.next); |
| 2826 | if (vvv->mapping.next<47) |
| 2827 | return; |
| 2828 | assert((mapping = array_get(&(vvv->mapping), 47))); |
| 2829 | assert(mapping->dir_index < vvv->directory.next); |
| 2830 | direntry = array_get(&(vvv->directory), mapping->dir_index); |
| 2831 | assert(!memcmp(direntry->name, "USB H ", 11) || direntry->name[0]==0); |
| 2832 | #endif |
| 2833 | return; |
| 2834 | /* avoid compiler warnings: */ |
| 2835 | hexdump(NULL, 100); |
| 2836 | remove_mapping(vvv, NULL); |
| 2837 | print_mapping(NULL); |
| 2838 | print_direntry(NULL); |
| 2839 | } |
| 2840 | #endif |
bellard | de167e4 | 2005-04-28 21:15:08 +0000 | [diff] [blame] | 2841 | |