Denis Vlasenko | c4f623e | 2006-12-26 01:30:59 +0000 | [diff] [blame^] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * probe.c - identify a block device by its contents, and return a dev |
| 4 | * struct with the details |
| 5 | * |
| 6 | * Copyright (C) 1999 by Andries Brouwer |
| 7 | * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o |
| 8 | * Copyright (C) 2001 by Andreas Dilger |
| 9 | * |
| 10 | * %Begin-Header% |
| 11 | * This file may be redistributed under the terms of the |
| 12 | * GNU Lesser General Public License. |
| 13 | * %End-Header% |
| 14 | */ |
| 15 | |
| 16 | #include <stdio.h> |
| 17 | #include <string.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <unistd.h> |
| 20 | #include <fcntl.h> |
| 21 | #include <sys/types.h> |
| 22 | #ifdef HAVE_SYS_STAT_H |
| 23 | #include <sys/stat.h> |
| 24 | #endif |
| 25 | #ifdef HAVE_SYS_MKDEV_H |
| 26 | #include <sys/mkdev.h> |
| 27 | #endif |
| 28 | #ifdef HAVE_ERRNO_H |
| 29 | #include <errno.h> |
| 30 | #endif |
| 31 | #include "blkidP.h" |
| 32 | #include "../uuid/uuid.h" |
| 33 | #include "probe.h" |
| 34 | |
| 35 | /* |
| 36 | * This is a special case code to check for an MDRAID device. We do |
| 37 | * this special since it requires checking for a superblock at the end |
| 38 | * of the device. |
| 39 | */ |
| 40 | static int check_mdraid(int fd, unsigned char *ret_uuid) |
| 41 | { |
| 42 | struct mdp_superblock_s *md; |
| 43 | blkid_loff_t offset; |
| 44 | char buf[4096]; |
| 45 | |
| 46 | if (fd < 0) |
| 47 | return -BLKID_ERR_PARAM; |
| 48 | |
| 49 | offset = (blkid_get_dev_size(fd) & ~((blkid_loff_t)65535)) - 65536; |
| 50 | |
| 51 | if (blkid_llseek(fd, offset, 0) < 0 || |
| 52 | read(fd, buf, 4096) != 4096) |
| 53 | return -BLKID_ERR_IO; |
| 54 | |
| 55 | /* Check for magic number */ |
| 56 | if (memcmp("\251+N\374", buf, 4)) |
| 57 | return -BLKID_ERR_PARAM; |
| 58 | |
| 59 | if (!ret_uuid) |
| 60 | return 0; |
| 61 | *ret_uuid = 0; |
| 62 | |
| 63 | /* The MD UUID is not contiguous in the superblock, make it so */ |
| 64 | md = (struct mdp_superblock_s *)buf; |
| 65 | if (md->set_uuid0 || md->set_uuid1 || md->set_uuid2 || md->set_uuid3) { |
| 66 | memcpy(ret_uuid, &md->set_uuid0, 4); |
| 67 | memcpy(ret_uuid, &md->set_uuid1, 12); |
| 68 | } |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static void set_uuid(blkid_dev dev, uuid_t uuid) |
| 73 | { |
| 74 | char str[37]; |
| 75 | |
| 76 | if (!uuid_is_null(uuid)) { |
| 77 | uuid_unparse(uuid, str); |
| 78 | blkid_set_tag(dev, "UUID", str, sizeof(str)); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | static void get_ext2_info(blkid_dev dev, unsigned char *buf) |
| 83 | { |
| 84 | struct ext2_super_block *es = (struct ext2_super_block *) buf; |
| 85 | const char *label = 0; |
| 86 | |
| 87 | DBG(DEBUG_PROBE, printf("ext2_sb.compat = %08X:%08X:%08X\n", |
| 88 | blkid_le32(es->s_feature_compat), |
| 89 | blkid_le32(es->s_feature_incompat), |
| 90 | blkid_le32(es->s_feature_ro_compat))); |
| 91 | |
| 92 | if (strlen(es->s_volume_name)) |
| 93 | label = es->s_volume_name; |
| 94 | blkid_set_tag(dev, "LABEL", label, sizeof(es->s_volume_name)); |
| 95 | |
| 96 | set_uuid(dev, es->s_uuid); |
| 97 | } |
| 98 | |
| 99 | static int probe_ext3(int fd __BLKID_ATTR((unused)), |
| 100 | blkid_cache cache __BLKID_ATTR((unused)), |
| 101 | blkid_dev dev, |
| 102 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 103 | unsigned char *buf) |
| 104 | { |
| 105 | struct ext2_super_block *es; |
| 106 | |
| 107 | es = (struct ext2_super_block *)buf; |
| 108 | |
| 109 | /* Distinguish between jbd and ext2/3 fs */ |
| 110 | if (blkid_le32(es->s_feature_incompat) & |
| 111 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) |
| 112 | return -BLKID_ERR_PARAM; |
| 113 | |
| 114 | /* Distinguish between ext3 and ext2 */ |
| 115 | if (!(blkid_le32(es->s_feature_compat) & |
| 116 | EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| 117 | return -BLKID_ERR_PARAM; |
| 118 | |
| 119 | get_ext2_info(dev, buf); |
| 120 | |
| 121 | blkid_set_tag(dev, "SEC_TYPE", "ext2", sizeof("ext2")); |
| 122 | |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | static int probe_ext2(int fd __BLKID_ATTR((unused)), |
| 127 | blkid_cache cache __BLKID_ATTR((unused)), |
| 128 | blkid_dev dev, |
| 129 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 130 | unsigned char *buf) |
| 131 | { |
| 132 | struct ext2_super_block *es; |
| 133 | |
| 134 | es = (struct ext2_super_block *)buf; |
| 135 | |
| 136 | /* Distinguish between jbd and ext2/3 fs */ |
| 137 | if (blkid_le32(es->s_feature_incompat) & |
| 138 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) |
| 139 | return -BLKID_ERR_PARAM; |
| 140 | |
| 141 | get_ext2_info(dev, buf); |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static int probe_jbd(int fd __BLKID_ATTR((unused)), |
| 147 | blkid_cache cache __BLKID_ATTR((unused)), |
| 148 | blkid_dev dev, |
| 149 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 150 | unsigned char *buf) |
| 151 | { |
| 152 | struct ext2_super_block *es = (struct ext2_super_block *) buf; |
| 153 | |
| 154 | if (!(blkid_le32(es->s_feature_incompat) & |
| 155 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) |
| 156 | return -BLKID_ERR_PARAM; |
| 157 | |
| 158 | get_ext2_info(dev, buf); |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int probe_vfat(int fd __BLKID_ATTR((unused)), |
| 164 | blkid_cache cache __BLKID_ATTR((unused)), |
| 165 | blkid_dev dev, |
| 166 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 167 | unsigned char *buf) |
| 168 | { |
| 169 | struct vfat_super_block *vs; |
| 170 | char serno[10]; |
| 171 | const char *label = 0; |
| 172 | int label_len = 0; |
| 173 | |
| 174 | vs = (struct vfat_super_block *)buf; |
| 175 | |
| 176 | if (strncmp(vs->vs_label, "NO NAME", 7)) { |
| 177 | char *end = vs->vs_label + sizeof(vs->vs_label) - 1; |
| 178 | |
| 179 | while (*end == ' ' && end >= vs->vs_label) |
| 180 | --end; |
| 181 | if (end >= vs->vs_label) { |
| 182 | label = vs->vs_label; |
| 183 | label_len = end - vs->vs_label + 1; |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | /* We can't just print them as %04X, because they are unaligned */ |
| 188 | sprintf(serno, "%02X%02X-%02X%02X", vs->vs_serno[3], vs->vs_serno[2], |
| 189 | vs->vs_serno[1], vs->vs_serno[0]); |
| 190 | blkid_set_tag(dev, "LABEL", label, label_len); |
| 191 | blkid_set_tag(dev, "UUID", serno, sizeof(serno)); |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int probe_msdos(int fd __BLKID_ATTR((unused)), |
| 197 | blkid_cache cache __BLKID_ATTR((unused)), |
| 198 | blkid_dev dev, |
| 199 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 200 | unsigned char *buf) |
| 201 | { |
| 202 | struct msdos_super_block *ms = (struct msdos_super_block *) buf; |
| 203 | char serno[10]; |
| 204 | const char *label = 0; |
| 205 | int label_len = 0; |
| 206 | |
| 207 | if (strncmp(ms->ms_label, "NO NAME", 7)) { |
| 208 | char *end = ms->ms_label + sizeof(ms->ms_label) - 1; |
| 209 | |
| 210 | while (*end == ' ' && end >= ms->ms_label) |
| 211 | --end; |
| 212 | if (end >= ms->ms_label) { |
| 213 | label = ms->ms_label; |
| 214 | label_len = end - ms->ms_label + 1; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | /* We can't just print them as %04X, because they are unaligned */ |
| 219 | sprintf(serno, "%02X%02X-%02X%02X", ms->ms_serno[3], ms->ms_serno[2], |
| 220 | ms->ms_serno[1], ms->ms_serno[0]); |
| 221 | blkid_set_tag(dev, "UUID", serno, 0); |
| 222 | blkid_set_tag(dev, "LABEL", label, label_len); |
| 223 | blkid_set_tag(dev, "SEC_TYPE", "msdos", sizeof("msdos")); |
| 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | static int probe_xfs(int fd __BLKID_ATTR((unused)), |
| 229 | blkid_cache cache __BLKID_ATTR((unused)), |
| 230 | blkid_dev dev, |
| 231 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 232 | unsigned char *buf) |
| 233 | { |
| 234 | struct xfs_super_block *xs; |
| 235 | const char *label = 0; |
| 236 | |
| 237 | xs = (struct xfs_super_block *)buf; |
| 238 | |
| 239 | if (strlen(xs->xs_fname)) |
| 240 | label = xs->xs_fname; |
| 241 | blkid_set_tag(dev, "LABEL", label, sizeof(xs->xs_fname)); |
| 242 | set_uuid(dev, xs->xs_uuid); |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | static int probe_reiserfs(int fd __BLKID_ATTR((unused)), |
| 247 | blkid_cache cache __BLKID_ATTR((unused)), |
| 248 | blkid_dev dev, |
| 249 | const struct blkid_magic *id, unsigned char *buf) |
| 250 | { |
| 251 | struct reiserfs_super_block *rs = (struct reiserfs_super_block *) buf; |
| 252 | unsigned int blocksize; |
| 253 | const char *label = 0; |
| 254 | |
| 255 | blocksize = blkid_le16(rs->rs_blocksize); |
| 256 | |
| 257 | /* If the superblock is inside the journal, we have the wrong one */ |
| 258 | if (id->bim_kboff/(blocksize>>10) > blkid_le32(rs->rs_journal_block)) |
| 259 | return -BLKID_ERR_BIG; |
| 260 | |
| 261 | /* LABEL/UUID are only valid for later versions of Reiserfs v3.6. */ |
| 262 | if (!strcmp(id->bim_magic, "ReIsEr2Fs") || |
| 263 | !strcmp(id->bim_magic, "ReIsEr3Fs")) { |
| 264 | if (strlen(rs->rs_label)) |
| 265 | label = rs->rs_label; |
| 266 | set_uuid(dev, rs->rs_uuid); |
| 267 | } |
| 268 | blkid_set_tag(dev, "LABEL", label, sizeof(rs->rs_label)); |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static int probe_jfs(int fd __BLKID_ATTR((unused)), |
| 274 | blkid_cache cache __BLKID_ATTR((unused)), |
| 275 | blkid_dev dev, |
| 276 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 277 | unsigned char *buf) |
| 278 | { |
| 279 | struct jfs_super_block *js; |
| 280 | const char *label = 0; |
| 281 | |
| 282 | js = (struct jfs_super_block *)buf; |
| 283 | |
| 284 | if (strlen((char *) js->js_label)) |
| 285 | label = (char *) js->js_label; |
| 286 | blkid_set_tag(dev, "LABEL", label, sizeof(js->js_label)); |
| 287 | set_uuid(dev, js->js_uuid); |
| 288 | return 0; |
| 289 | } |
| 290 | |
| 291 | static int probe_romfs(int fd __BLKID_ATTR((unused)), |
| 292 | blkid_cache cache __BLKID_ATTR((unused)), |
| 293 | blkid_dev dev, |
| 294 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 295 | unsigned char *buf) |
| 296 | { |
| 297 | struct romfs_super_block *ros; |
| 298 | const char *label = 0; |
| 299 | |
| 300 | ros = (struct romfs_super_block *)buf; |
| 301 | |
| 302 | if (strlen((char *) ros->ros_volume)) |
| 303 | label = (char *) ros->ros_volume; |
| 304 | blkid_set_tag(dev, "LABEL", label, 0); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int probe_cramfs(int fd __BLKID_ATTR((unused)), |
| 309 | blkid_cache cache __BLKID_ATTR((unused)), |
| 310 | blkid_dev dev, |
| 311 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 312 | unsigned char *buf) |
| 313 | { |
| 314 | struct cramfs_super_block *csb; |
| 315 | const char *label = 0; |
| 316 | |
| 317 | csb = (struct cramfs_super_block *)buf; |
| 318 | |
| 319 | if (strlen((char *) csb->name)) |
| 320 | label = (char *) csb->name; |
| 321 | blkid_set_tag(dev, "LABEL", label, 0); |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | static int probe_swap0(int fd __BLKID_ATTR((unused)), |
| 326 | blkid_cache cache __BLKID_ATTR((unused)), |
| 327 | blkid_dev dev, |
| 328 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 329 | unsigned char *buf __BLKID_ATTR((unused))) |
| 330 | { |
| 331 | blkid_set_tag(dev, "UUID", 0, 0); |
| 332 | blkid_set_tag(dev, "LABEL", 0, 0); |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | static int probe_swap1(int fd, |
| 337 | blkid_cache cache __BLKID_ATTR((unused)), |
| 338 | blkid_dev dev, |
| 339 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 340 | unsigned char *buf __BLKID_ATTR((unused))) |
| 341 | { |
| 342 | struct swap_id_block *sws; |
| 343 | |
| 344 | probe_swap0(fd, cache, dev, id, buf); |
| 345 | /* |
| 346 | * Version 1 swap headers are always located at offset of 1024 |
| 347 | * bytes, although the swap signature itself is located at the |
| 348 | * end of the page (which may vary depending on hardware |
| 349 | * pagesize). |
| 350 | */ |
| 351 | if (lseek(fd, 1024, SEEK_SET) < 0) return 1; |
| 352 | sws = xmalloc(1024); |
| 353 | if (read(fd, sws, 1024) != 1024) { |
| 354 | free(sws); |
| 355 | return 1; |
| 356 | } |
| 357 | |
| 358 | /* arbitrary sanity check.. is there any garbage down there? */ |
| 359 | if (sws->sws_pad[32] == 0 && sws->sws_pad[33] == 0) { |
| 360 | if (sws->sws_volume[0]) |
| 361 | blkid_set_tag(dev, "LABEL", (const char*)sws->sws_volume, |
| 362 | sizeof(sws->sws_volume)); |
| 363 | if (sws->sws_uuid[0]) |
| 364 | set_uuid(dev, sws->sws_uuid); |
| 365 | } |
| 366 | free(sws); |
| 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static const char |
| 372 | * const udf_magic[] = { "BEA01", "BOOT2", "CD001", "CDW02", "NSR02", |
| 373 | "NSR03", "TEA01", 0 }; |
| 374 | |
| 375 | static int probe_udf(int fd, blkid_cache cache __BLKID_ATTR((unused)), |
| 376 | blkid_dev dev __BLKID_ATTR((unused)), |
| 377 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 378 | unsigned char *buf __BLKID_ATTR((unused))) |
| 379 | { |
| 380 | int j, bs; |
| 381 | struct iso_volume_descriptor isosb; |
| 382 | const char * const * m; |
| 383 | |
| 384 | /* determine the block size by scanning in 2K increments |
| 385 | (block sizes larger than 2K will be null padded) */ |
| 386 | for (bs = 1; bs < 16; bs++) { |
| 387 | lseek(fd, bs*2048+32768, SEEK_SET); |
| 388 | if (read(fd, (char *)&isosb, sizeof(isosb)) != sizeof(isosb)) |
| 389 | return 1; |
| 390 | if (isosb.id[0]) |
| 391 | break; |
| 392 | } |
| 393 | |
| 394 | /* Scan up to another 64 blocks looking for additional VSD's */ |
| 395 | for (j = 1; j < 64; j++) { |
| 396 | if (j > 1) { |
| 397 | lseek(fd, j*bs*2048+32768, SEEK_SET); |
| 398 | if (read(fd, (char *)&isosb, sizeof(isosb)) |
| 399 | != sizeof(isosb)) |
| 400 | return 1; |
| 401 | } |
| 402 | /* If we find NSR0x then call it udf: |
| 403 | NSR01 for UDF 1.00 |
| 404 | NSR02 for UDF 1.50 |
| 405 | NSR03 for UDF 2.00 */ |
| 406 | if (!strncmp(isosb.id, "NSR0", 4)) |
| 407 | return 0; |
| 408 | for (m = udf_magic; *m; m++) |
| 409 | if (!strncmp(*m, isosb.id, 5)) |
| 410 | break; |
| 411 | if (*m == 0) |
| 412 | return 1; |
| 413 | } |
| 414 | return 1; |
| 415 | } |
| 416 | |
| 417 | static int probe_ocfs(int fd __BLKID_ATTR((unused)), |
| 418 | blkid_cache cache __BLKID_ATTR((unused)), |
| 419 | blkid_dev dev, |
| 420 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 421 | unsigned char *buf) |
| 422 | { |
| 423 | struct ocfs_volume_header ovh; |
| 424 | struct ocfs_volume_label ovl; |
| 425 | __u32 major; |
| 426 | |
| 427 | memcpy(&ovh, buf, sizeof(ovh)); |
| 428 | memcpy(&ovl, buf+512, sizeof(ovl)); |
| 429 | |
| 430 | major = ocfsmajor(ovh); |
| 431 | if (major == 1) |
| 432 | blkid_set_tag(dev,"SEC_TYPE","ocfs1",sizeof("ocfs1")); |
| 433 | else if (major >= 9) |
| 434 | blkid_set_tag(dev,"SEC_TYPE","ntocfs",sizeof("ntocfs")); |
| 435 | |
| 436 | blkid_set_tag(dev, "LABEL", (const char*)ovl.label, ocfslabellen(ovl)); |
| 437 | blkid_set_tag(dev, "MOUNT", (const char*)ovh.mount, ocfsmountlen(ovh)); |
| 438 | set_uuid(dev, ovl.vol_id); |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | static int probe_ocfs2(int fd __BLKID_ATTR((unused)), |
| 443 | blkid_cache cache __BLKID_ATTR((unused)), |
| 444 | blkid_dev dev, |
| 445 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 446 | unsigned char *buf) |
| 447 | { |
| 448 | struct ocfs2_super_block *osb; |
| 449 | |
| 450 | osb = (struct ocfs2_super_block *)buf; |
| 451 | |
| 452 | blkid_set_tag(dev, "LABEL", (const char*)osb->s_label, sizeof(osb->s_label)); |
| 453 | set_uuid(dev, osb->s_uuid); |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | static int probe_oracleasm(int fd __BLKID_ATTR((unused)), |
| 458 | blkid_cache cache __BLKID_ATTR((unused)), |
| 459 | blkid_dev dev, |
| 460 | const struct blkid_magic *id __BLKID_ATTR((unused)), |
| 461 | unsigned char *buf) |
| 462 | { |
| 463 | struct oracle_asm_disk_label *dl; |
| 464 | |
| 465 | dl = (struct oracle_asm_disk_label *)buf; |
| 466 | |
| 467 | blkid_set_tag(dev, "LABEL", dl->dl_id, sizeof(dl->dl_id)); |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | /* |
| 472 | * BLKID_BLK_OFFS is at least as large as the highest bim_kboff defined |
| 473 | * in the type_array table below + bim_kbalign. |
| 474 | * |
| 475 | * When probing for a lot of magics, we handle everything in 1kB buffers so |
| 476 | * that we don't have to worry about reading each combination of block sizes. |
| 477 | */ |
| 478 | #define BLKID_BLK_OFFS 64 /* currently reiserfs */ |
| 479 | |
| 480 | /* |
| 481 | * Various filesystem magics that we can check for. Note that kboff and |
| 482 | * sboff are in kilobytes and bytes respectively. All magics are in |
| 483 | * byte strings so we don't worry about endian issues. |
| 484 | */ |
| 485 | static const struct blkid_magic type_array[] = { |
| 486 | /* type kboff sboff len magic probe */ |
| 487 | { "oracleasm", 0, 32, 8, "ORCLDISK", probe_oracleasm }, |
| 488 | { "ntfs", 0, 3, 8, "NTFS ", 0 }, |
| 489 | { "jbd", 1, 0x38, 2, "\123\357", probe_jbd }, |
| 490 | { "ext3", 1, 0x38, 2, "\123\357", probe_ext3 }, |
| 491 | { "ext2", 1, 0x38, 2, "\123\357", probe_ext2 }, |
| 492 | { "reiserfs", 8, 0x34, 8, "ReIsErFs", probe_reiserfs }, |
| 493 | { "reiserfs", 64, 0x34, 9, "ReIsEr2Fs", probe_reiserfs }, |
| 494 | { "reiserfs", 64, 0x34, 9, "ReIsEr3Fs", probe_reiserfs }, |
| 495 | { "reiserfs", 64, 0x34, 8, "ReIsErFs", probe_reiserfs }, |
| 496 | { "reiserfs", 8, 20, 8, "ReIsErFs", probe_reiserfs }, |
| 497 | { "vfat", 0, 0x52, 5, "MSWIN", probe_vfat }, |
| 498 | { "vfat", 0, 0x52, 8, "FAT32 ", probe_vfat }, |
| 499 | { "vfat", 0, 0x36, 5, "MSDOS", probe_msdos }, |
| 500 | { "vfat", 0, 0x36, 8, "FAT16 ", probe_msdos }, |
| 501 | { "vfat", 0, 0x36, 8, "FAT12 ", probe_msdos }, |
| 502 | { "minix", 1, 0x10, 2, "\177\023", 0 }, |
| 503 | { "minix", 1, 0x10, 2, "\217\023", 0 }, |
| 504 | { "minix", 1, 0x10, 2, "\150\044", 0 }, |
| 505 | { "minix", 1, 0x10, 2, "\170\044", 0 }, |
| 506 | { "vxfs", 1, 0, 4, "\365\374\001\245", 0 }, |
| 507 | { "xfs", 0, 0, 4, "XFSB", probe_xfs }, |
| 508 | { "romfs", 0, 0, 8, "-rom1fs-", probe_romfs }, |
| 509 | { "bfs", 0, 0, 4, "\316\372\173\033", 0 }, |
| 510 | { "cramfs", 0, 0, 4, "E=\315\050", probe_cramfs }, |
| 511 | { "qnx4", 0, 4, 6, "QNX4FS", 0 }, |
| 512 | { "udf", 32, 1, 5, "BEA01", probe_udf }, |
| 513 | { "udf", 32, 1, 5, "BOOT2", probe_udf }, |
| 514 | { "udf", 32, 1, 5, "CD001", probe_udf }, |
| 515 | { "udf", 32, 1, 5, "CDW02", probe_udf }, |
| 516 | { "udf", 32, 1, 5, "NSR02", probe_udf }, |
| 517 | { "udf", 32, 1, 5, "NSR03", probe_udf }, |
| 518 | { "udf", 32, 1, 5, "TEA01", probe_udf }, |
| 519 | { "iso9660", 32, 1, 5, "CD001", 0 }, |
| 520 | { "iso9660", 32, 9, 5, "CDROM", 0 }, |
| 521 | { "jfs", 32, 0, 4, "JFS1", probe_jfs }, |
| 522 | { "hfs", 1, 0, 2, "BD", 0 }, |
| 523 | { "ufs", 8, 0x55c, 4, "T\031\001\000", 0 }, |
| 524 | { "hpfs", 8, 0, 4, "I\350\225\371", 0 }, |
| 525 | { "sysv", 0, 0x3f8, 4, "\020~\030\375", 0 }, |
| 526 | { "swap", 0, 0xff6, 10, "SWAP-SPACE", probe_swap0 }, |
| 527 | { "swap", 0, 0xff6, 10, "SWAPSPACE2", probe_swap1 }, |
| 528 | { "swap", 0, 0x1ff6, 10, "SWAP-SPACE", probe_swap0 }, |
| 529 | { "swap", 0, 0x1ff6, 10, "SWAPSPACE2", probe_swap1 }, |
| 530 | { "swap", 0, 0x3ff6, 10, "SWAP-SPACE", probe_swap0 }, |
| 531 | { "swap", 0, 0x3ff6, 10, "SWAPSPACE2", probe_swap1 }, |
| 532 | { "swap", 0, 0x7ff6, 10, "SWAP-SPACE", probe_swap0 }, |
| 533 | { "swap", 0, 0x7ff6, 10, "SWAPSPACE2", probe_swap1 }, |
| 534 | { "swap", 0, 0xfff6, 10, "SWAP-SPACE", probe_swap0 }, |
| 535 | { "swap", 0, 0xfff6, 10, "SWAPSPACE2", probe_swap1 }, |
| 536 | { "ocfs", 0, 8, 9, "OracleCFS", probe_ocfs }, |
| 537 | { "ocfs2", 1, 0, 6, "OCFSV2", probe_ocfs2 }, |
| 538 | { "ocfs2", 2, 0, 6, "OCFSV2", probe_ocfs2 }, |
| 539 | { "ocfs2", 4, 0, 6, "OCFSV2", probe_ocfs2 }, |
| 540 | { "ocfs2", 8, 0, 6, "OCFSV2", probe_ocfs2 }, |
| 541 | { NULL, 0, 0, 0, NULL, NULL } |
| 542 | }; |
| 543 | |
| 544 | /* |
| 545 | * Verify that the data in dev is consistent with what is on the actual |
| 546 | * block device (using the devname field only). Normally this will be |
| 547 | * called when finding items in the cache, but for long running processes |
| 548 | * is also desirable to revalidate an item before use. |
| 549 | * |
| 550 | * If we are unable to revalidate the data, we return the old data and |
| 551 | * do not set the BLKID_BID_FL_VERIFIED flag on it. |
| 552 | */ |
| 553 | blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev) |
| 554 | { |
| 555 | const struct blkid_magic *id; |
| 556 | unsigned char *bufs[BLKID_BLK_OFFS + 1], *buf; |
| 557 | const char *type; |
| 558 | struct stat st; |
| 559 | time_t diff, now; |
| 560 | int fd, idx; |
| 561 | |
| 562 | if (!dev) |
| 563 | return NULL; |
| 564 | |
| 565 | now = time(0); |
| 566 | diff = now - dev->bid_time; |
| 567 | |
| 568 | if ((now < dev->bid_time) || |
| 569 | (diff < BLKID_PROBE_MIN) || |
| 570 | (dev->bid_flags & BLKID_BID_FL_VERIFIED && |
| 571 | diff < BLKID_PROBE_INTERVAL)) |
| 572 | return dev; |
| 573 | |
| 574 | DBG(DEBUG_PROBE, |
| 575 | printf("need to revalidate %s (time since last check %lu)\n", |
| 576 | dev->bid_name, diff)); |
| 577 | |
| 578 | if (((fd = open(dev->bid_name, O_RDONLY)) < 0) || |
| 579 | (fstat(fd, &st) < 0)) { |
| 580 | if (errno == ENXIO || errno == ENODEV || errno == ENOENT) { |
| 581 | blkid_free_dev(dev); |
| 582 | return NULL; |
| 583 | } |
| 584 | /* We don't have read permission, just return cache data. */ |
| 585 | DBG(DEBUG_PROBE, |
| 586 | printf("returning unverified data for %s\n", |
| 587 | dev->bid_name)); |
| 588 | return dev; |
| 589 | } |
| 590 | |
| 591 | memset(bufs, 0, sizeof(bufs)); |
| 592 | |
| 593 | /* |
| 594 | * Iterate over the type array. If we already know the type, |
| 595 | * then try that first. If it doesn't work, then blow away |
| 596 | * the type information, and try again. |
| 597 | * |
| 598 | */ |
| 599 | try_again: |
| 600 | type = 0; |
| 601 | if (!dev->bid_type || !strcmp(dev->bid_type, "mdraid")) { |
| 602 | uuid_t uuid; |
| 603 | |
| 604 | if (check_mdraid(fd, uuid) == 0) { |
| 605 | set_uuid(dev, uuid); |
| 606 | type = "mdraid"; |
| 607 | goto found_type; |
| 608 | } |
| 609 | } |
| 610 | for (id = type_array; id->bim_type; id++) { |
| 611 | if (dev->bid_type && |
| 612 | strcmp(id->bim_type, dev->bid_type)) |
| 613 | continue; |
| 614 | |
| 615 | idx = id->bim_kboff + (id->bim_sboff >> 10); |
| 616 | if (idx > BLKID_BLK_OFFS || idx < 0) |
| 617 | continue; |
| 618 | buf = bufs[idx]; |
| 619 | if (!buf) { |
| 620 | if (lseek(fd, idx << 10, SEEK_SET) < 0) |
| 621 | continue; |
| 622 | |
| 623 | buf = xmalloc(1024); |
| 624 | |
| 625 | if (read(fd, buf, 1024) != 1024) { |
| 626 | free(buf); |
| 627 | continue; |
| 628 | } |
| 629 | bufs[idx] = buf; |
| 630 | } |
| 631 | |
| 632 | if (memcmp(id->bim_magic, buf + (id->bim_sboff&0x3ff), |
| 633 | id->bim_len)) |
| 634 | continue; |
| 635 | |
| 636 | if ((id->bim_probe == NULL) || |
| 637 | (id->bim_probe(fd, cache, dev, id, buf) == 0)) { |
| 638 | type = id->bim_type; |
| 639 | goto found_type; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | if (!id->bim_type && dev->bid_type) { |
| 644 | /* |
| 645 | * Zap the device filesystem type and try again |
| 646 | */ |
| 647 | blkid_set_tag(dev, "TYPE", 0, 0); |
| 648 | blkid_set_tag(dev, "SEC_TYPE", 0, 0); |
| 649 | blkid_set_tag(dev, "LABEL", 0, 0); |
| 650 | blkid_set_tag(dev, "UUID", 0, 0); |
| 651 | goto try_again; |
| 652 | } |
| 653 | |
| 654 | if (!dev->bid_type) { |
| 655 | blkid_free_dev(dev); |
| 656 | return NULL; |
| 657 | } |
| 658 | |
| 659 | found_type: |
| 660 | if (dev && type) { |
| 661 | dev->bid_devno = st.st_rdev; |
| 662 | dev->bid_time = time(0); |
| 663 | dev->bid_flags |= BLKID_BID_FL_VERIFIED; |
| 664 | cache->bic_flags |= BLKID_BIC_FL_CHANGED; |
| 665 | |
| 666 | blkid_set_tag(dev, "TYPE", type, 0); |
| 667 | |
| 668 | DBG(DEBUG_PROBE, printf("%s: devno 0x%04llx, type %s\n", |
| 669 | dev->bid_name, st.st_rdev, type)); |
| 670 | } |
| 671 | |
| 672 | close(fd); |
| 673 | |
| 674 | return dev; |
| 675 | } |
| 676 | |
| 677 | int blkid_known_fstype(const char *fstype) |
| 678 | { |
| 679 | const struct blkid_magic *id; |
| 680 | |
| 681 | for (id = type_array; id->bim_type; id++) { |
| 682 | if (strcmp(fstype, id->bim_type) == 0) |
| 683 | return 1; |
| 684 | } |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | #ifdef TEST_PROGRAM |
| 689 | int main(int argc, char **argv) |
| 690 | { |
| 691 | blkid_dev dev; |
| 692 | blkid_cache cache; |
| 693 | int ret; |
| 694 | |
| 695 | blkid_debug_mask = DEBUG_ALL; |
| 696 | if (argc != 2) { |
| 697 | fprintf(stderr, "Usage: %s device\n" |
| 698 | "Probe a single device to determine type\n", argv[0]); |
| 699 | exit(1); |
| 700 | } |
| 701 | if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) { |
| 702 | fprintf(stderr, "%s: error creating cache (%d)\n", |
| 703 | argv[0], ret); |
| 704 | exit(1); |
| 705 | } |
| 706 | dev = blkid_get_dev(cache, argv[1], BLKID_DEV_NORMAL); |
| 707 | if (!dev) { |
| 708 | printf("%s: %s has an unsupported type\n", argv[0], argv[1]); |
| 709 | return 1; |
| 710 | } |
| 711 | printf("%s is type %s\n", argv[1], dev->bid_type ? |
| 712 | dev->bid_type : "(null)"); |
| 713 | if (dev->bid_label) |
| 714 | printf("\tlabel is '%s'\n", dev->bid_label); |
| 715 | if (dev->bid_uuid) |
| 716 | printf("\tuuid is %s\n", dev->bid_uuid); |
| 717 | |
| 718 | blkid_free_dev(dev); |
| 719 | return 0; |
| 720 | } |
| 721 | #endif |