1 /** 2 * libf2fs.c 3 * 4 * Copyright (c) 2013 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * Dual licensed under the GPL or LGPL version 2 licenses. 8 */ 9 #define _LARGEFILE64_SOURCE 10 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <errno.h> 15 #include <unistd.h> 16 #include <fcntl.h> 17 #include <mntent.h> 18 #include <time.h> 19 #include <sys/stat.h> 20 #include <sys/mount.h> 21 #include <sys/ioctl.h> 22 #include <linux/hdreg.h> 23 24 #include <f2fs_fs.h> 25 26 void ASCIIToUNICODE(u_int16_t *out_buf, u_int8_t *in_buf) 27 { 28 u_int8_t *pchTempPtr = in_buf; 29 u_int16_t *pwTempPtr = out_buf; 30 31 while (*pchTempPtr != '\0') { 32 *pwTempPtr = (u_int16_t)*pchTempPtr; 33 pchTempPtr++; 34 pwTempPtr++; 35 } 36 *pwTempPtr = '\0'; 37 return; 38 } 39 40 int log_base_2(u_int32_t num) 41 { 42 int ret = 0; 43 if (num <= 0 || (num & (num - 1)) != 0) 44 return -1; 45 46 while (num >>= 1) 47 ret++; 48 return ret; 49 } 50 51 /* 52 * f2fs bit operations 53 */ 54 static const int bits_in_byte[256] = { 55 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 56 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 57 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 58 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 59 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 60 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 61 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 62 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 63 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 64 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 65 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 66 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 67 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 68 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 69 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 70 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8, 71 }; 72 73 int get_bits_in_byte(unsigned char n) 74 { 75 return bits_in_byte[n]; 76 } 77 78 int set_bit(unsigned int nr,void * addr) 79 { 80 int mask, retval; 81 unsigned char *ADDR = (unsigned char *) addr; 82 83 ADDR += nr >> 3; 84 mask = 1 << ((nr & 0x07)); 85 retval = mask & *ADDR; 86 *ADDR |= mask; 87 return retval; 88 } 89 90 int clear_bit(unsigned int nr, void * addr) 91 { 92 int mask, retval; 93 unsigned char *ADDR = (unsigned char *) addr; 94 95 ADDR += nr >> 3; 96 mask = 1 << ((nr & 0x07)); 97 retval = mask & *ADDR; 98 *ADDR &= ~mask; 99 return retval; 100 } 101 102 int test_bit(unsigned int nr, const void * addr) 103 { 104 const __u32 *p = (const __u32 *)addr; 105 106 nr = nr ^ 0; 107 108 return ((1 << (nr & 31)) & (p[nr >> 5])) != 0; 109 } 110 111 int f2fs_test_bit(unsigned int nr, const char *p) 112 { 113 int mask; 114 char *addr = (char *)p; 115 116 addr += (nr >> 3); 117 mask = 1 << (7 - (nr & 0x07)); 118 return (mask & *addr) != 0; 119 } 120 121 int f2fs_set_bit(unsigned int nr, char *addr) 122 { 123 int mask; 124 int ret; 125 126 addr += (nr >> 3); 127 mask = 1 << (7 - (nr & 0x07)); 128 ret = mask & *addr; 129 *addr |= mask; 130 return ret; 131 } 132 133 int f2fs_clear_bit(unsigned int nr, char *addr) 134 { 135 int mask; 136 int ret; 137 138 addr += (nr >> 3); 139 mask = 1 << (7 - (nr & 0x07)); 140 ret = mask & *addr; 141 *addr &= ~mask; 142 return ret; 143 } 144 145 static inline unsigned long __ffs(unsigned long word) 146 { 147 int num = 0; 148 149 #if BITS_PER_LONG == 64 150 if ((word & 0xffffffff) == 0) { 151 num += 32; 152 word >>= 32; 153 } 154 #endif 155 if ((word & 0xffff) == 0) { 156 num += 16; 157 word >>= 16; 158 } 159 if ((word & 0xff) == 0) { 160 num += 8; 161 word >>= 8; 162 } 163 if ((word & 0xf) == 0) { 164 num += 4; 165 word >>= 4; 166 } 167 if ((word & 0x3) == 0) { 168 num += 2; 169 word >>= 2; 170 } 171 if ((word & 0x1) == 0) 172 num += 1; 173 return num; 174 } 175 176 unsigned long find_next_bit(const unsigned long *addr, unsigned long size, 177 unsigned long offset) 178 { 179 const unsigned long *p = addr + BIT_WORD(offset); 180 unsigned long result = offset & ~(BITS_PER_LONG-1); 181 unsigned long tmp; 182 183 if (offset >= size) 184 return size; 185 size -= result; 186 offset %= BITS_PER_LONG; 187 if (offset) { 188 tmp = *(p++); 189 tmp &= (~0UL << offset); 190 if (size < BITS_PER_LONG) 191 goto found_first; 192 if (tmp) 193 goto found_middle; 194 size -= BITS_PER_LONG; 195 result += BITS_PER_LONG; 196 } 197 while (size & ~(BITS_PER_LONG-1)) { 198 if ((tmp = *(p++))) 199 goto found_middle; 200 result += BITS_PER_LONG; 201 size -= BITS_PER_LONG; 202 } 203 if (!size) 204 return result; 205 tmp = *p; 206 207 found_first: 208 tmp &= (~0UL >> (BITS_PER_LONG - size)); 209 if (tmp == 0UL) /* Are any bits set? */ 210 return result + size; /* Nope. */ 211 found_middle: 212 return result + __ffs(tmp); 213 } 214 215 /* 216 * Hashing code adapted from ext3 217 */ 218 #define DELTA 0x9E3779B9 219 220 static void TEA_transform(unsigned int buf[4], unsigned int const in[]) 221 { 222 __u32 sum = 0; 223 __u32 b0 = buf[0], b1 = buf[1]; 224 __u32 a = in[0], b = in[1], c = in[2], d = in[3]; 225 int n = 16; 226 227 do { 228 sum += DELTA; 229 b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b); 230 b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d); 231 } while (--n); 232 233 buf[0] += b0; 234 buf[1] += b1; 235 236 } 237 238 static void str2hashbuf(const unsigned char *msg, int len, 239 unsigned int *buf, int num) 240 { 241 unsigned pad, val; 242 int i; 243 244 pad = (__u32)len | ((__u32)len << 8); 245 pad |= pad << 16; 246 247 val = pad; 248 if (len > num * 4) 249 len = num * 4; 250 for (i = 0; i < len; i++) { 251 if ((i % 4) == 0) 252 val = pad; 253 val = msg[i] + (val << 8); 254 if ((i % 4) == 3) { 255 *buf++ = val; 256 val = pad; 257 num--; 258 } 259 } 260 if (--num >= 0) 261 *buf++ = val; 262 while (--num >= 0) 263 *buf++ = pad; 264 265 } 266 267 /** 268 * Return hash value of directory entry 269 * @param name dentry name 270 * @param len name lenth 271 * @return return on success hash value, errno on failure 272 */ 273 f2fs_hash_t f2fs_dentry_hash(const unsigned char *name, int len) 274 { 275 __u32 hash; 276 f2fs_hash_t f2fs_hash; 277 const unsigned char *p; 278 __u32 in[8], buf[4]; 279 280 /* special hash codes for special dentries */ 281 if ((len <= 2) && (name[0] == '.') && 282 (name[1] == '.' || name[1] == '\0')) 283 return 0; 284 285 /* Initialize the default seed for the hash checksum functions */ 286 buf[0] = 0x67452301; 287 buf[1] = 0xefcdab89; 288 buf[2] = 0x98badcfe; 289 buf[3] = 0x10325476; 290 291 p = name; 292 while (1) { 293 str2hashbuf(p, len, in, 4); 294 TEA_transform(buf, in); 295 p += 16; 296 if (len <= 16) 297 break; 298 len -= 16; 299 } 300 hash = buf[0]; 301 302 f2fs_hash = cpu_to_le32(hash & ~F2FS_HASH_COL_BIT); 303 return f2fs_hash; 304 } 305 306 unsigned int addrs_per_inode(struct f2fs_inode *i) 307 { 308 if (i->i_inline & F2FS_INLINE_XATTR) 309 return DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS; 310 return DEF_ADDRS_PER_INODE; 311 } 312 313 /* 314 * CRC32 315 */ 316 #define CRCPOLY_LE 0xedb88320 317 318 u_int32_t f2fs_cal_crc32(u_int32_t crc, void *buf, int len) 319 { 320 int i; 321 unsigned char *p = (unsigned char *)buf; 322 while (len--) { 323 crc ^= *p++; 324 for (i = 0; i < 8; i++) 325 crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); 326 } 327 return crc; 328 } 329 330 int f2fs_crc_valid(u_int32_t blk_crc, void *buf, int len) 331 { 332 u_int32_t cal_crc = 0; 333 334 cal_crc = f2fs_cal_crc32(F2FS_SUPER_MAGIC, buf, len); 335 336 if (cal_crc != blk_crc) { 337 DBG(0,"CRC validation failed: cal_crc = %u, " 338 "blk_crc = %u buff_size = 0x%x\n", 339 cal_crc, blk_crc, len); 340 return -1; 341 } 342 return 0; 343 } 344 345 /* 346 * device information 347 */ 348 void f2fs_init_configuration(struct f2fs_configuration *c) 349 { 350 c->total_sectors = 0; 351 c->sector_size = DEFAULT_SECTOR_SIZE; 352 c->sectors_per_blk = DEFAULT_SECTORS_PER_BLOCK; 353 c->blks_per_seg = DEFAULT_BLOCKS_PER_SEGMENT; 354 355 /* calculated by overprovision ratio */ 356 c->reserved_segments = 48; 357 c->overprovision = 5; 358 c->segs_per_sec = 1; 359 c->secs_per_zone = 1; 360 c->heap = 1; 361 c->vol_label = ""; 362 c->device_name = NULL; 363 c->trim = 1; 364 } 365 366 static int is_mounted(const char *mpt, const char *device) 367 { 368 FILE *file = NULL; 369 struct mntent *mnt = NULL; 370 371 file = setmntent(mpt, "r"); 372 if (file == NULL) 373 return 0; 374 375 while ((mnt = getmntent(file)) != NULL) { 376 if (!strcmp(device, mnt->mnt_fsname)) 377 break; 378 } 379 endmntent(file); 380 return mnt ? 1 : 0; 381 } 382 383 int f2fs_dev_is_umounted(struct f2fs_configuration *c) 384 { 385 struct stat st_buf; 386 int ret = 0; 387 388 ret = is_mounted(MOUNTED, c->device_name); 389 if (ret) { 390 MSG(0, "\tError: Not available on mounted device!\n"); 391 return -1; 392 } 393 394 /* 395 * if failed due to /etc/mtab file not present 396 * try with /proc/mounts. 397 */ 398 ret = is_mounted("/proc/mounts", c->device_name); 399 if (ret) { 400 MSG(0, "\tError: Not available on mounted device!\n"); 401 return -1; 402 } 403 404 /* 405 * If f2fs is umounted with -l, the process can still use 406 * the file system. In this case, we should not format. 407 */ 408 if (stat(c->device_name, &st_buf) == 0 && S_ISBLK(st_buf.st_mode)) { 409 int fd = open(c->device_name, O_RDONLY | O_EXCL); 410 411 if (fd >= 0) { 412 close(fd); 413 } else if (errno == EBUSY) { 414 MSG(0, "\tError: In use by the system!\n"); 415 return -1; 416 } 417 } 418 return 0; 419 } 420 421 int f2fs_get_device_info(struct f2fs_configuration *c) 422 { 423 int32_t fd = 0; 424 uint32_t sector_size; 425 #ifndef BLKGETSIZE64 426 uint32_t total_sectors; 427 #endif 428 struct stat stat_buf; 429 struct hd_geometry geom; 430 u_int64_t wanted_total_sectors = c->total_sectors; 431 432 fd = open(c->device_name, O_RDWR); 433 if (fd < 0) { 434 MSG(0, "\tError: Failed to open the device!\n"); 435 return -1; 436 } 437 c->fd = fd; 438 439 if (fstat(fd, &stat_buf) < 0 ) { 440 MSG(0, "\tError: Failed to get the device stat!\n"); 441 return -1; 442 } 443 444 if (S_ISREG(stat_buf.st_mode)) { 445 c->total_sectors = stat_buf.st_size / c->sector_size; 446 } else if (S_ISBLK(stat_buf.st_mode)) { 447 if (ioctl(fd, BLKSSZGET, §or_size) < 0) { 448 MSG(0, "\tError: Using the default sector size\n"); 449 } else { 450 if (c->sector_size < sector_size) { 451 MSG(0, "\tError: Cannot set the sector size to:" 452 " %d as the device does not support" 453 "\nSetting the sector size to : %d\n", 454 c->sector_size, sector_size); 455 c->sector_size = sector_size; 456 c->sectors_per_blk = PAGE_SIZE / sector_size; 457 } 458 } 459 460 #ifdef BLKGETSIZE64 461 if (ioctl(fd, BLKGETSIZE64, &c->total_sectors) < 0) { 462 MSG(0, "\tError: Cannot get the device size\n"); 463 return -1; 464 } 465 c->total_sectors /= c->sector_size; 466 #else 467 if (ioctl(fd, BLKGETSIZE, &total_sectors) < 0) { 468 MSG(0, "\tError: Cannot get the device size\n"); 469 return -1; 470 } 471 total_sectors /= c->sector_size; 472 c->total_sectors = total_sectors; 473 #endif 474 if (ioctl(fd, HDIO_GETGEO, &geom) < 0) 475 c->start_sector = 0; 476 else 477 c->start_sector = geom.start; 478 } else { 479 MSG(0, "\tError: Volume type is not supported!!!\n"); 480 return -1; 481 } 482 if (wanted_total_sectors && wanted_total_sectors < c->total_sectors) { 483 MSG(0, "Info: total device sectors = %"PRIu64" (in 512bytes)\n", 484 c->total_sectors); 485 c->total_sectors = wanted_total_sectors; 486 487 } 488 MSG(0, "Info: sector size = %u\n", c->sector_size); 489 MSG(0, "Info: total sectors = %"PRIu64" (in 512bytes)\n", 490 c->total_sectors); 491 if (c->total_sectors < 492 (F2FS_MIN_VOLUME_SIZE / DEFAULT_SECTOR_SIZE)) { 493 MSG(0, "Error: Min volume size supported is %d\n", 494 F2FS_MIN_VOLUME_SIZE); 495 return -1; 496 } 497 498 return 0; 499 } 500 501
