Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 1 | /** |
| 2 | * libf2fs.c |
| 3 | * |
| 4 | * Copyright (c) 2013 Samsung Electronics Co., Ltd. |
| 5 | * http://www.samsung.com/ |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | #define _LARGEFILE64_SOURCE |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <string.h> |
Jaegeuk Kim | 2c877a8 | 2013-08-02 17:03:10 +0900 | [diff] [blame] | 16 | #include <errno.h> |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 17 | #include <unistd.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <mntent.h> |
| 20 | #include <time.h> |
| 21 | #include <sys/stat.h> |
| 22 | #include <sys/mount.h> |
| 23 | #include <sys/ioctl.h> |
| 24 | #include <linux/hdreg.h> |
| 25 | #include <linux/fs.h> |
| 26 | |
Changman Lee | 7f35b54 | 2013-07-04 17:11:32 +0900 | [diff] [blame] | 27 | #include <f2fs_fs.h> |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 28 | |
| 29 | struct f2fs_configuration config; |
| 30 | |
| 31 | void ASCIIToUNICODE(u_int16_t *out_buf, u_int8_t *in_buf) |
| 32 | { |
| 33 | u_int8_t *pchTempPtr = in_buf; |
| 34 | u_int16_t *pwTempPtr = out_buf; |
| 35 | |
| 36 | while (*pchTempPtr != '\0') { |
| 37 | *pwTempPtr = (u_int16_t)*pchTempPtr; |
| 38 | pchTempPtr++; |
| 39 | pwTempPtr++; |
| 40 | } |
| 41 | *pwTempPtr = '\0'; |
| 42 | return; |
| 43 | } |
| 44 | |
| 45 | int log_base_2(u_int32_t num) |
| 46 | { |
| 47 | int ret = 0; |
| 48 | if (num <= 0 || (num & (num - 1)) != 0) |
| 49 | return -1; |
| 50 | |
| 51 | while (num >>= 1) |
| 52 | ret++; |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * f2fs bit operations |
| 58 | */ |
Changman Lee | 7f35b54 | 2013-07-04 17:11:32 +0900 | [diff] [blame] | 59 | static const int bits_in_byte[256] = { |
| 60 | 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, |
| 61 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 62 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 63 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 64 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 65 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 66 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 67 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 68 | 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, |
| 69 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 70 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 71 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 72 | 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, |
| 73 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 74 | 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, |
| 75 | 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8, |
| 76 | }; |
| 77 | |
| 78 | int get_bits_in_byte(unsigned char n) |
| 79 | { |
| 80 | return bits_in_byte[n]; |
| 81 | } |
| 82 | |
| 83 | int set_bit(unsigned int nr,void * addr) |
| 84 | { |
| 85 | int mask, retval; |
| 86 | unsigned char *ADDR = (unsigned char *) addr; |
| 87 | |
| 88 | ADDR += nr >> 3; |
| 89 | mask = 1 << ((nr & 0x07)); |
| 90 | retval = mask & *ADDR; |
| 91 | *ADDR |= mask; |
| 92 | return retval; |
| 93 | } |
| 94 | |
| 95 | int clear_bit(unsigned int nr, void * addr) |
| 96 | { |
| 97 | int mask, retval; |
| 98 | unsigned char *ADDR = (unsigned char *) addr; |
| 99 | |
| 100 | ADDR += nr >> 3; |
| 101 | mask = 1 << ((nr & 0x07)); |
| 102 | retval = mask & *ADDR; |
| 103 | *ADDR &= ~mask; |
| 104 | return retval; |
| 105 | } |
| 106 | |
| 107 | int test_bit(unsigned int nr, const void * addr) |
| 108 | { |
| 109 | const __u32 *p = (const __u32 *)addr; |
| 110 | |
| 111 | nr = nr ^ 0; |
| 112 | |
| 113 | return ((1 << (nr & 31)) & (p[nr >> 5])) != 0; |
| 114 | } |
| 115 | |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 116 | int f2fs_test_bit(unsigned int nr, const char *p) |
| 117 | { |
| 118 | int mask; |
| 119 | char *addr = (char *)p; |
| 120 | |
| 121 | addr += (nr >> 3); |
| 122 | mask = 1 << (7 - (nr & 0x07)); |
| 123 | return (mask & *addr) != 0; |
| 124 | } |
| 125 | |
Changman Lee | 7f35b54 | 2013-07-04 17:11:32 +0900 | [diff] [blame] | 126 | int f2fs_set_bit(unsigned int nr, char *addr) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 127 | { |
| 128 | int mask; |
| 129 | int ret; |
| 130 | |
| 131 | addr += (nr >> 3); |
| 132 | mask = 1 << (7 - (nr & 0x07)); |
| 133 | ret = mask & *addr; |
| 134 | *addr |= mask; |
| 135 | return ret; |
| 136 | } |
| 137 | |
| 138 | int f2fs_clear_bit(unsigned int nr, char *addr) |
| 139 | { |
| 140 | int mask; |
| 141 | int ret; |
| 142 | |
| 143 | addr += (nr >> 3); |
| 144 | mask = 1 << (7 - (nr & 0x07)); |
| 145 | ret = mask & *addr; |
| 146 | *addr &= ~mask; |
| 147 | return ret; |
| 148 | } |
| 149 | |
Changman Lee | 57baa23 | 2013-07-30 16:39:06 +0900 | [diff] [blame] | 150 | static inline unsigned long __ffs(unsigned long word) |
| 151 | { |
| 152 | int num = 0; |
| 153 | |
| 154 | #if BITS_PER_LONG == 64 |
| 155 | if ((word & 0xffffffff) == 0) { |
| 156 | num += 32; |
| 157 | word >>= 32; |
| 158 | } |
| 159 | #endif |
| 160 | if ((word & 0xffff) == 0) { |
| 161 | num += 16; |
| 162 | word >>= 16; |
| 163 | } |
| 164 | if ((word & 0xff) == 0) { |
| 165 | num += 8; |
| 166 | word >>= 8; |
| 167 | } |
| 168 | if ((word & 0xf) == 0) { |
| 169 | num += 4; |
| 170 | word >>= 4; |
| 171 | } |
| 172 | if ((word & 0x3) == 0) { |
| 173 | num += 2; |
| 174 | word >>= 2; |
| 175 | } |
| 176 | if ((word & 0x1) == 0) |
| 177 | num += 1; |
| 178 | return num; |
| 179 | } |
| 180 | |
| 181 | unsigned long find_next_bit(const unsigned long *addr, unsigned long size, |
| 182 | unsigned long offset) |
| 183 | { |
| 184 | const unsigned long *p = addr + BIT_WORD(offset); |
| 185 | unsigned long result = offset & ~(BITS_PER_LONG-1); |
| 186 | unsigned long tmp; |
| 187 | |
| 188 | if (offset >= size) |
| 189 | return size; |
| 190 | size -= result; |
| 191 | offset %= BITS_PER_LONG; |
| 192 | if (offset) { |
| 193 | tmp = *(p++); |
| 194 | tmp &= (~0UL << offset); |
| 195 | if (size < BITS_PER_LONG) |
| 196 | goto found_first; |
| 197 | if (tmp) |
| 198 | goto found_middle; |
| 199 | size -= BITS_PER_LONG; |
| 200 | result += BITS_PER_LONG; |
| 201 | } |
| 202 | while (size & ~(BITS_PER_LONG-1)) { |
| 203 | if ((tmp = *(p++))) |
| 204 | goto found_middle; |
| 205 | result += BITS_PER_LONG; |
| 206 | size -= BITS_PER_LONG; |
| 207 | } |
| 208 | if (!size) |
| 209 | return result; |
| 210 | tmp = *p; |
| 211 | |
| 212 | found_first: |
| 213 | tmp &= (~0UL >> (BITS_PER_LONG - size)); |
| 214 | if (tmp == 0UL) /* Are any bits set? */ |
| 215 | return result + size; /* Nope. */ |
| 216 | found_middle: |
| 217 | return result + __ffs(tmp); |
| 218 | } |
| 219 | |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 220 | /* |
Changman Lee | 7f35b54 | 2013-07-04 17:11:32 +0900 | [diff] [blame] | 221 | * Hashing code adapted from ext3 |
| 222 | */ |
| 223 | #define DELTA 0x9E3779B9 |
| 224 | |
| 225 | static void TEA_transform(unsigned int buf[4], unsigned int const in[]) |
| 226 | { |
| 227 | __u32 sum = 0; |
| 228 | __u32 b0 = buf[0], b1 = buf[1]; |
| 229 | __u32 a = in[0], b = in[1], c = in[2], d = in[3]; |
| 230 | int n = 16; |
| 231 | |
| 232 | do { |
| 233 | sum += DELTA; |
| 234 | b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b); |
| 235 | b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d); |
| 236 | } while (--n); |
| 237 | |
| 238 | buf[0] += b0; |
| 239 | buf[1] += b1; |
| 240 | |
| 241 | } |
| 242 | |
| 243 | static void str2hashbuf(const char *msg, int len, unsigned int *buf, int num) |
| 244 | { |
| 245 | unsigned pad, val; |
| 246 | int i; |
| 247 | |
| 248 | pad = (__u32)len | ((__u32)len << 8); |
| 249 | pad |= pad << 16; |
| 250 | |
| 251 | val = pad; |
| 252 | if (len > num * 4) |
| 253 | len = num * 4; |
| 254 | for (i = 0; i < len; i++) { |
| 255 | if ((i % 4) == 0) |
| 256 | val = pad; |
| 257 | val = msg[i] + (val << 8); |
| 258 | if ((i % 4) == 3) { |
| 259 | *buf++ = val; |
| 260 | val = pad; |
| 261 | num--; |
| 262 | } |
| 263 | } |
| 264 | if (--num >= 0) |
| 265 | *buf++ = val; |
| 266 | while (--num >= 0) |
| 267 | *buf++ = pad; |
| 268 | |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Return hash value of directory entry |
| 273 | * @param name dentry name |
| 274 | * @param len name lenth |
| 275 | * @return return on success hash value, errno on failure |
| 276 | */ |
| 277 | f2fs_hash_t f2fs_dentry_hash(const char *name, int len) |
| 278 | { |
| 279 | __u32 hash; |
| 280 | f2fs_hash_t f2fs_hash; |
| 281 | const char *p; |
| 282 | __u32 in[8], buf[4]; |
| 283 | |
| 284 | /* special hash codes for special dentries */ |
| 285 | if (name[0] == '.') { |
| 286 | if (name[1] == '\0') { |
| 287 | f2fs_hash = F2FS_DOT_HASH; |
| 288 | goto exit; |
| 289 | } |
| 290 | if (name[1] == '.' && name[2] == '\0') { |
| 291 | f2fs_hash = F2FS_DDOT_HASH; |
| 292 | goto exit; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /* Initialize the default seed for the hash checksum functions */ |
| 297 | buf[0] = 0x67452301; |
| 298 | buf[1] = 0xefcdab89; |
| 299 | buf[2] = 0x98badcfe; |
| 300 | buf[3] = 0x10325476; |
| 301 | |
| 302 | p = name; |
| 303 | while (len > 0) { |
| 304 | str2hashbuf(p, len, in, 4); |
| 305 | TEA_transform(buf, in); |
| 306 | len -= 16; |
| 307 | p += 16; |
| 308 | } |
| 309 | hash = buf[0]; |
| 310 | |
| 311 | f2fs_hash = hash; |
| 312 | exit: |
| 313 | f2fs_hash &= ~F2FS_HASH_COL_BIT; |
| 314 | |
| 315 | return f2fs_hash; |
| 316 | } |
| 317 | |
Jaegeuk Kim | cd1e470 | 2013-08-20 18:05:56 +0900 | [diff] [blame^] | 318 | unsigned int addrs_per_inode(struct f2fs_inode *i) |
| 319 | { |
| 320 | if (i->i_inline & F2FS_INLINE_XATTR) |
| 321 | return DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS; |
| 322 | return DEF_ADDRS_PER_INODE; |
| 323 | } |
| 324 | |
Changman Lee | 7f35b54 | 2013-07-04 17:11:32 +0900 | [diff] [blame] | 325 | /* |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 326 | * CRC32 |
| 327 | */ |
| 328 | #define CRCPOLY_LE 0xedb88320 |
| 329 | |
| 330 | u_int32_t f2fs_cal_crc32(u_int32_t crc, void *buf, int len) |
| 331 | { |
| 332 | int i; |
| 333 | unsigned char *p = (unsigned char *)buf; |
| 334 | while (len--) { |
| 335 | crc ^= *p++; |
| 336 | for (i = 0; i < 8; i++) |
| 337 | crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); |
| 338 | } |
| 339 | return crc; |
| 340 | } |
| 341 | |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 342 | int f2fs_crc_valid(u_int32_t blk_crc, void *buf, int len) |
| 343 | { |
| 344 | u_int32_t cal_crc = 0; |
| 345 | |
| 346 | cal_crc = f2fs_cal_crc32(F2FS_SUPER_MAGIC, buf, len); |
| 347 | |
| 348 | if (cal_crc != blk_crc) { |
| 349 | DBG(0,"CRC validation failed: cal_crc = %u \ |
| 350 | blk_crc = %u buff_size = 0x%x", |
| 351 | cal_crc, blk_crc, len); |
| 352 | return -1; |
| 353 | } |
| 354 | return 0; |
| 355 | } |
| 356 | |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 357 | /* |
| 358 | * device information |
| 359 | */ |
| 360 | void f2fs_init_configuration(struct f2fs_configuration *c) |
| 361 | { |
| 362 | c->sector_size = DEFAULT_SECTOR_SIZE; |
| 363 | c->sectors_per_blk = DEFAULT_SECTORS_PER_BLOCK; |
| 364 | c->blks_per_seg = DEFAULT_BLOCKS_PER_SEGMENT; |
| 365 | |
| 366 | /* calculated by overprovision ratio */ |
| 367 | c->reserved_segments = 48; |
| 368 | c->overprovision = 5; |
| 369 | c->segs_per_sec = 1; |
| 370 | c->secs_per_zone = 1; |
| 371 | c->heap = 1; |
Mike Fleetwood | 9799d63 | 2013-04-02 23:15:20 +0100 | [diff] [blame] | 372 | c->vol_label = ""; |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 373 | c->device_name = NULL; |
| 374 | } |
| 375 | |
Jaegeuk Kim | 2c877a8 | 2013-08-02 17:03:10 +0900 | [diff] [blame] | 376 | static int is_mounted(const char *mpt, const char *device) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 377 | { |
| 378 | FILE *file = NULL; |
| 379 | struct mntent *mnt = NULL; |
| 380 | |
Jaegeuk Kim | 2c877a8 | 2013-08-02 17:03:10 +0900 | [diff] [blame] | 381 | file = setmntent(mpt, "r"); |
| 382 | if (file == NULL) |
| 383 | return 0; |
| 384 | |
| 385 | while ((mnt = getmntent(file)) != NULL) { |
| 386 | if (!strcmp(device, mnt->mnt_fsname)) |
| 387 | break; |
| 388 | } |
| 389 | endmntent(file); |
| 390 | return mnt ? 1 : 0; |
| 391 | } |
| 392 | |
| 393 | int f2fs_dev_is_umounted(struct f2fs_configuration *c) |
| 394 | { |
| 395 | struct stat st_buf; |
| 396 | int ret = 0; |
| 397 | |
| 398 | ret = is_mounted(MOUNTED, c->device_name); |
| 399 | if (ret) { |
| 400 | MSG(0, "\tError: Not available on mounted device!\n"); |
| 401 | return -1; |
Namjae Jeon | 8d3802b | 2013-03-31 11:51:29 +0900 | [diff] [blame] | 402 | } |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 403 | |
Jaegeuk Kim | 2c877a8 | 2013-08-02 17:03:10 +0900 | [diff] [blame] | 404 | /* |
| 405 | * if failed due to /etc/mtab file not present |
| 406 | * try with /proc/mounts. |
| 407 | */ |
| 408 | ret = is_mounted("/proc/mounts", c->device_name); |
| 409 | if (ret) { |
| 410 | MSG(0, "\tError: Not available on mounted device!\n"); |
| 411 | return -1; |
| 412 | } |
| 413 | |
| 414 | /* |
| 415 | * If f2fs is umounted with -l, the process can still use |
| 416 | * the file system. In this case, we should not format. |
| 417 | */ |
| 418 | if (stat(c->device_name, &st_buf) == 0 && S_ISBLK(st_buf.st_mode)) { |
| 419 | int fd = open(c->device_name, O_RDONLY | O_EXCL); |
| 420 | |
| 421 | if (fd >= 0) { |
| 422 | close(fd); |
| 423 | } else if (errno == EBUSY) { |
| 424 | MSG(0, "\tError: In use by the system!\n"); |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 425 | return -1; |
| 426 | } |
| 427 | } |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | int f2fs_get_device_info(struct f2fs_configuration *c) |
| 432 | { |
| 433 | int32_t fd = 0; |
| 434 | int32_t sector_size; |
| 435 | struct stat stat_buf; |
| 436 | struct hd_geometry geom; |
| 437 | |
| 438 | fd = open(c->device_name, O_RDWR); |
| 439 | if (fd < 0) { |
| 440 | MSG(0, "\tError: Failed to open the device!\n"); |
| 441 | return -1; |
| 442 | } |
| 443 | c->fd = fd; |
| 444 | |
| 445 | if (fstat(fd, &stat_buf) < 0 ) { |
| 446 | MSG(0, "\tError: Failed to get the device stat!\n"); |
| 447 | return -1; |
| 448 | } |
| 449 | |
| 450 | if (S_ISREG(stat_buf.st_mode)) { |
| 451 | c->total_sectors = stat_buf.st_size / c->sector_size; |
| 452 | } else if (S_ISBLK(stat_buf.st_mode)) { |
| 453 | if (ioctl(fd, BLKSSZGET, §or_size) < 0) { |
| 454 | MSG(0, "\tError: Using the default sector size\n"); |
| 455 | } else { |
| 456 | if (c->sector_size < sector_size) { |
| 457 | MSG(0, "\tError: Cannot set the sector size to:" |
| 458 | " %d as the device does not support" |
| 459 | "\nSetting the sector size to : %d\n", |
| 460 | c->sector_size, sector_size); |
| 461 | c->sector_size = sector_size; |
| 462 | c->sectors_per_blk = PAGE_SIZE / sector_size; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | if (ioctl(fd, BLKGETSIZE, &c->total_sectors) < 0) { |
| 467 | MSG(0, "\tError: Cannot get the device size\n"); |
| 468 | return -1; |
| 469 | } |
| 470 | |
| 471 | if (ioctl(fd, HDIO_GETGEO, &geom) < 0) |
| 472 | c->start_sector = 0; |
| 473 | else |
| 474 | c->start_sector = geom.start; |
| 475 | } else { |
| 476 | MSG(0, "\tError: Volume type is not supported!!!\n"); |
| 477 | return -1; |
| 478 | } |
| 479 | |
| 480 | MSG(0, "Info: sector size = %u\n", c->sector_size); |
| 481 | MSG(0, "Info: total sectors = %"PRIu64" (in 512bytes)\n", |
| 482 | c->total_sectors); |
| 483 | if (c->total_sectors < |
| 484 | (F2FS_MIN_VOLUME_SIZE / DEFAULT_SECTOR_SIZE)) { |
| 485 | MSG(0, "Error: Min volume size supported is %d\n", |
| 486 | F2FS_MIN_VOLUME_SIZE); |
| 487 | return -1; |
| 488 | } |
| 489 | |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * IO interfaces |
| 495 | */ |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 496 | int dev_read(void *buf, __u64 offset, size_t len) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 497 | { |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 498 | if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 499 | return -1; |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 500 | if (read(config.fd, buf, len) < 0) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 501 | return -1; |
| 502 | return 0; |
| 503 | } |
| 504 | |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 505 | int dev_write(void *buf, __u64 offset, size_t len) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 506 | { |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 507 | if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 508 | return -1; |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 509 | if (write(config.fd, buf, len) < 0) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 510 | return -1; |
| 511 | return 0; |
| 512 | } |
| 513 | |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 514 | int dev_read_block(void *buf, __u64 blk_addr) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 515 | { |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 516 | return dev_read(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE); |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 517 | } |
| 518 | |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 519 | int dev_read_blocks(void *buf, __u64 addr, __u32 nr_blks) |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 520 | { |
Jaegeuk Kim | 5043dff | 2013-02-12 11:03:24 +0900 | [diff] [blame] | 521 | return dev_read(buf, addr * F2FS_BLKSIZE, nr_blks * F2FS_BLKSIZE); |
Jaegeuk Kim | e69e437 | 2013-01-25 17:20:16 +0900 | [diff] [blame] | 522 | } |