1 /* 2 * This file is part of UBIFS. 3 * 4 * Copyright (C) 2006-2008 Nokia Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 51 17 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 * 19 * Authors: Artem Bityutskiy (Битюцкий Артём) 20 * Adrian Hunter 21 */ 22 23 /* 24 * This file implements UBIFS superblock. The superblock is stored at the first 25 * LEB of the volume and is never changed by UBIFS. Only user-space tools may 26 * change it. The superblock node mostly contains geometry information. 27 */ 28 29 #include "ubifs.h" 30 #include <linux/random.h> 31 #include <linux/math64.h> 32 33 /* 34 * Default journal size in logical eraseblocks as a percent of total 35 * flash size. 36 */ 37 #define DEFAULT_JNL_PERCENT 5 38 39 /* Default maximum journal size in bytes */ 40 #define DEFAULT_MAX_JNL (32*1024*1024) 41 42 /* Default indexing tree fanout */ 43 #define DEFAULT_FANOUT 8 44 45 /* Default number of data journal heads */ 46 #define DEFAULT_JHEADS_CNT 1 47 48 /* Default positions of different LEBs in the main area */ 49 #define DEFAULT_IDX_LEB 0 50 #define DEFAULT_DATA_LEB 1 51 #define DEFAULT_GC_LEB 2 52 53 /* Default number of LEB numbers in LPT's save table */ 54 #define DEFAULT_LSAVE_CNT 256 55 56 /* Default reserved pool size as a percent of maximum free space */ 57 #define DEFAULT_RP_PERCENT 5 58 59 /* The default maximum size of reserved pool in bytes */ 60 #define DEFAULT_MAX_RP_SIZE (5*1024*1024) 61 62 /* Default time granularity in nanoseconds */ 63 #define DEFAULT_TIME_GRAN 1000000000 64 65 /** 66 * create_default_filesystem - format empty UBI volume. 67 * @c: UBIFS file-system description object 68 * 69 * This function creates default empty file-system. Returns zero in case of 70 * success and a negative error code in case of failure. 71 */ 72 static int create_default_filesystem(struct ubifs_info *c) 73 { 74 struct ubifs_sb_node *sup; 75 struct ubifs_mst_node *mst; 76 struct ubifs_idx_node *idx; 77 struct ubifs_branch *br; 78 struct ubifs_ino_node *ino; 79 struct ubifs_cs_node *cs; 80 union ubifs_key key; 81 int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first; 82 int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0; 83 int min_leb_cnt = UBIFS_MIN_LEB_CNT; 84 long long tmp64, main_bytes; 85 __le64 tmp_le64; 86 87 /* Some functions called from here depend on the @c->key_len filed */ 88 c->key_len = UBIFS_SK_LEN; 89 90 /* 91 * First of all, we have to calculate default file-system geometry - 92 * log size, journal size, etc. 93 */ 94 if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JNL_PERCENT) 95 /* We can first multiply then divide and have no overflow */ 96 jnl_lebs = c->leb_cnt * DEFAULT_JNL_PERCENT / 100; 97 else 98 jnl_lebs = (c->leb_cnt / 100) * DEFAULT_JNL_PERCENT; 99 100 if (jnl_lebs < UBIFS_MIN_JNL_LEBS) 101 jnl_lebs = UBIFS_MIN_JNL_LEBS; 102 if (jnl_lebs * c->leb_size > DEFAULT_MAX_JNL) 103 jnl_lebs = DEFAULT_MAX_JNL / c->leb_size; 104 105 /* 106 * The log should be large enough to fit reference nodes for all bud 107 * LEBs. Because buds do not have to start from the beginning of LEBs 108 * (half of the LEB may contain committed data), the log should 109 * generally be larger, make it twice as large. 110 */ 111 tmp = 2 * (c->ref_node_alsz * jnl_lebs) + c->leb_size - 1; 112 log_lebs = tmp / c->leb_size; 113 /* Plus one LEB reserved for commit */ 114 log_lebs += 1; 115 if (c->leb_cnt - min_leb_cnt > 8) { 116 /* And some extra space to allow writes while committing */ 117 log_lebs += 1; 118 min_leb_cnt += 1; 119 } 120 121 max_buds = jnl_lebs - log_lebs; 122 if (max_buds < UBIFS_MIN_BUD_LEBS) 123 max_buds = UBIFS_MIN_BUD_LEBS; 124 125 /* 126 * Orphan nodes are stored in a separate area. One node can store a lot 127 * of orphan inode numbers, but when new orphan comes we just add a new 128 * orphan node. At some point the nodes are consolidated into one 129 * orphan node. 130 */ 131 orph_lebs = UBIFS_MIN_ORPH_LEBS; 132 #ifdef CONFIG_UBIFS_FS_DEBUG 133 if (c->leb_cnt - min_leb_cnt > 1) 134 /* 135 * For debugging purposes it is better to have at least 2 136 * orphan LEBs, because the orphan subsystem would need to do 137 * consolidations and would be stressed more. 138 */ 139 orph_lebs += 1; 140 #endif 141 142 main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs; 143 main_lebs -= orph_lebs; 144 145 lpt_first = UBIFS_LOG_LNUM + log_lebs; 146 c->lsave_cnt = DEFAULT_LSAVE_CNT; 147 c->max_leb_cnt = c->leb_cnt; 148 err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs, 149 &big_lpt); 150 if (err) 151 return err; 152 153 dbg_gen("LEB Properties Tree created (LEBs %d-%d)", lpt_first, 154 lpt_first + lpt_lebs - 1); 155 156 main_first = c->leb_cnt - main_lebs; 157 158 /* Create default superblock */ 159 tmp = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size); 160 sup = kzalloc(tmp, GFP_KERNEL); 161 if (!sup) 162 return -ENOMEM; 163 164 tmp64 = (long long)max_buds * c->leb_size; 165 if (big_lpt) 166 sup_flags |= UBIFS_FLG_BIGLPT; 167 168 sup->ch.node_type = UBIFS_SB_NODE; 169 sup->key_hash = UBIFS_KEY_HASH_R5; 170 sup->flags = cpu_to_le32(sup_flags); 171 sup->min_io_size = cpu_to_le32(c->min_io_size); 172 sup->leb_size = cpu_to_le32(c->leb_size); 173 sup->leb_cnt = cpu_to_le32(c->leb_cnt); 174 sup->max_leb_cnt = cpu_to_le32(c->max_leb_cnt); 175 sup->max_bud_bytes = cpu_to_le64(tmp64); 176 sup->log_lebs = cpu_to_le32(log_lebs); 177 sup->lpt_lebs = cpu_to_le32(lpt_lebs); 178 sup->orph_lebs = cpu_to_le32(orph_lebs); 179 sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT); 180 sup->fanout = cpu_to_le32(DEFAULT_FANOUT); 181 sup->lsave_cnt = cpu_to_le32(c->lsave_cnt); 182 sup->fmt_version = cpu_to_le32(UBIFS_FORMAT_VERSION); 183 sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN); 184 if (c->mount_opts.override_compr) 185 sup->default_compr = cpu_to_le16(c->mount_opts.compr_type); 186 else 187 sup->default_compr = cpu_to_le16(UBIFS_COMPR_LZO); 188 189 generate_random_uuid(sup->uuid); 190 191 main_bytes = (long long)main_lebs * c->leb_size; 192 tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100); 193 if (tmp64 > DEFAULT_MAX_RP_SIZE) 194 tmp64 = DEFAULT_MAX_RP_SIZE; 195 sup->rp_size = cpu_to_le64(tmp64); 196 sup->ro_compat_version = cpu_to_le32(UBIFS_RO_COMPAT_VERSION); 197 198 err = ubifs_write_node(c, sup, UBIFS_SB_NODE_SZ, 0, 0, UBI_LONGTERM); 199 kfree(sup); 200 if (err) 201 return err; 202 203 dbg_gen("default superblock created at LEB 0:0"); 204 205 /* Create default master node */ 206 mst = kzalloc(c->mst_node_alsz, GFP_KERNEL); 207 if (!mst) 208 return -ENOMEM; 209 210 mst->ch.node_type = UBIFS_MST_NODE; 211 mst->log_lnum = cpu_to_le32(UBIFS_LOG_LNUM); 212 mst->highest_inum = cpu_to_le64(UBIFS_FIRST_INO); 213 mst->cmt_no = 0; 214 mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); 215 mst->root_offs = 0; 216 tmp = ubifs_idx_node_sz(c, 1); 217 mst->root_len = cpu_to_le32(tmp); 218 mst->gc_lnum = cpu_to_le32(main_first + DEFAULT_GC_LEB); 219 mst->ihead_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB); 220 mst->ihead_offs = cpu_to_le32(ALIGN(tmp, c->min_io_size)); 221 mst->index_size = cpu_to_le64(ALIGN(tmp, 8)); 222 mst->lpt_lnum = cpu_to_le32(c->lpt_lnum); 223 mst->lpt_offs = cpu_to_le32(c->lpt_offs); 224 mst->nhead_lnum = cpu_to_le32(c->nhead_lnum); 225 mst->nhead_offs = cpu_to_le32(c->nhead_offs); 226 mst->ltab_lnum = cpu_to_le32(c->ltab_lnum); 227 mst->ltab_offs = cpu_to_le32(c->ltab_offs); 228 mst->lsave_lnum = cpu_to_le32(c->lsave_lnum); 229 mst->lsave_offs = cpu_to_le32(c->lsave_offs); 230 mst->lscan_lnum = cpu_to_le32(main_first); 231 mst->empty_lebs = cpu_to_le32(main_lebs - 2); 232 mst->idx_lebs = cpu_to_le32(1); 233 mst->leb_cnt = cpu_to_le32(c->leb_cnt); 234 235 /* Calculate lprops statistics */ 236 tmp64 = main_bytes; 237 tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); 238 tmp64 -= ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size); 239 mst->total_free = cpu_to_le64(tmp64); 240 241 tmp64 = ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size); 242 ino_waste = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size) - 243 UBIFS_INO_NODE_SZ; 244 tmp64 += ino_waste; 245 tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), 8); 246 mst->total_dirty = cpu_to_le64(tmp64); 247 248 /* The indexing LEB does not contribute to dark space */ 249 tmp64 = (c->main_lebs - 1) * c->dark_wm; 250 mst->total_dark = cpu_to_le64(tmp64); 251 252 mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ); 253 254 err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0, 255 UBI_UNKNOWN); 256 if (err) { 257 kfree(mst); 258 return err; 259 } 260 err = ubifs_write_node(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1, 0, 261 UBI_UNKNOWN); 262 kfree(mst); 263 if (err) 264 return err; 265 266 dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM); 267 268 /* Create the root indexing node */ 269 tmp = ubifs_idx_node_sz(c, 1); 270 idx = kzalloc(ALIGN(tmp, c->min_io_size), GFP_KERNEL); 271 if (!idx) 272 return -ENOMEM; 273 274 c->key_fmt = UBIFS_SIMPLE_KEY_FMT; 275 c->key_hash = key_r5_hash; 276 277 idx->ch.node_type = UBIFS_IDX_NODE; 278 idx->child_cnt = cpu_to_le16(1); 279 ino_key_init(c, &key, UBIFS_ROOT_INO); 280 br = ubifs_idx_branch(c, idx, 0); 281 key_write_idx(c, &key, &br->key); 282 br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB); 283 br->len = cpu_to_le32(UBIFS_INO_NODE_SZ); 284 err = ubifs_write_node(c, idx, tmp, main_first + DEFAULT_IDX_LEB, 0, 285 UBI_UNKNOWN); 286 kfree(idx); 287 if (err) 288 return err; 289 290 dbg_gen("default root indexing node created LEB %d:0", 291 main_first + DEFAULT_IDX_LEB); 292 293 /* Create default root inode */ 294 tmp = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size); 295 ino = kzalloc(tmp, GFP_KERNEL); 296 if (!ino) 297 return -ENOMEM; 298 299 ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO); 300 ino->ch.node_type = UBIFS_INO_NODE; 301 ino->creat_sqnum = cpu_to_le64(++c->max_sqnum); 302 ino->nlink = cpu_to_le32(2); 303 tmp_le64 = cpu_to_le64(CURRENT_TIME_SEC.tv_sec); 304 ino->atime_sec = tmp_le64; 305 ino->ctime_sec = tmp_le64; 306 ino->mtime_sec = tmp_le64; 307 ino->atime_nsec = 0; 308 ino->ctime_nsec = 0; 309 ino->mtime_nsec = 0; 310 ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO); 311 ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ); 312 313 /* Set compression enabled by default */ 314 ino->flags = cpu_to_le32(UBIFS_COMPR_FL); 315 316 err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ, 317 main_first + DEFAULT_DATA_LEB, 0, 318 UBI_UNKNOWN); 319 kfree(ino); 320 if (err) 321 return err; 322 323 dbg_gen("root inode created at LEB %d:0", 324 main_first + DEFAULT_DATA_LEB); 325 326 /* 327 * The first node in the log has to be the commit start node. This is 328 * always the case during normal file-system operation. Write a fake 329 * commit start node to the log. 330 */ 331 tmp = ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size); 332 cs = kzalloc(tmp, GFP_KERNEL); 333 if (!cs) 334 return -ENOMEM; 335 336 cs->ch.node_type = UBIFS_CS_NODE; 337 err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 338 0, UBI_UNKNOWN); 339 kfree(cs); 340 341 ubifs_msg("default file-system created"); 342 return 0; 343 } 344 345 /** 346 * validate_sb - validate superblock node. 347 * @c: UBIFS file-system description object 348 * @sup: superblock node 349 * 350 * This function validates superblock node @sup. Since most of data was read 351 * from the superblock and stored in @c, the function validates fields in @c 352 * instead. Returns zero in case of success and %-EINVAL in case of validation 353 * failure. 354 */ 355 static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup) 356 { 357 long long max_bytes; 358 int err = 1, min_leb_cnt; 359 360 if (!c->key_hash) { 361 err = 2; 362 goto failed; 363 } 364 365 if (sup->key_fmt != UBIFS_SIMPLE_KEY_FMT) { 366 err = 3; 367 goto failed; 368 } 369 370 if (le32_to_cpu(sup->min_io_size) != c->min_io_size) { 371 ubifs_err("min. I/O unit mismatch: %d in superblock, %d real", 372 le32_to_cpu(sup->min_io_size), c->min_io_size); 373 goto failed; 374 } 375 376 if (le32_to_cpu(sup->leb_size) != c->leb_size) { 377 ubifs_err("LEB size mismatch: %d in superblock, %d real", 378 le32_to_cpu(sup->leb_size), c->leb_size); 379 goto failed; 380 } 381 382 if (c->log_lebs < UBIFS_MIN_LOG_LEBS || 383 c->lpt_lebs < UBIFS_MIN_LPT_LEBS || 384 c->orph_lebs < UBIFS_MIN_ORPH_LEBS || 385 c->main_lebs < UBIFS_MIN_MAIN_LEBS) { 386 err = 4; 387 goto failed; 388 } 389 390 /* 391 * Calculate minimum allowed amount of main area LEBs. This is very 392 * similar to %UBIFS_MIN_LEB_CNT, but we take into account real what we 393 * have just read from the superblock. 394 */ 395 min_leb_cnt = UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs; 396 min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6; 397 398 if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.size) { 399 ubifs_err("bad LEB count: %d in superblock, %d on UBI volume, " 400 "%d minimum required", c->leb_cnt, c->vi.size, 401 min_leb_cnt); 402 goto failed; 403 } 404 405 if (c->max_leb_cnt < c->leb_cnt) { 406 ubifs_err("max. LEB count %d less than LEB count %d", 407 c->max_leb_cnt, c->leb_cnt); 408 goto failed; 409 } 410 411 if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) { 412 err = 7; 413 goto failed; 414 } 415 416 if (c->max_bud_bytes < (long long)c->leb_size * UBIFS_MIN_BUD_LEBS || 417 c->max_bud_bytes > (long long)c->leb_size * c->main_lebs) { 418 err = 8; 419 goto failed; 420 } 421 422 if (c->jhead_cnt < NONDATA_JHEADS_CNT + 1 || 423 c->jhead_cnt > NONDATA_JHEADS_CNT + UBIFS_MAX_JHEADS) { 424 err = 9; 425 goto failed; 426 } 427 428 if (c->fanout < UBIFS_MIN_FANOUT || 429 ubifs_idx_node_sz(c, c->fanout) > c->leb_size) { 430 err = 10; 431 goto failed; 432 } 433 434 if (c->lsave_cnt < 0 || (c->lsave_cnt > DEFAULT_LSAVE_CNT && 435 c->lsave_cnt > c->max_leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - 436 c->log_lebs - c->lpt_lebs - c->orph_lebs)) { 437 err = 11; 438 goto failed; 439 } 440 441 if (UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs + c->lpt_lebs + 442 c->orph_lebs + c->main_lebs != c->leb_cnt) { 443 err = 12; 444 goto failed; 445 } 446 447 if (c->default_compr < 0 || c->default_compr >= UBIFS_COMPR_TYPES_CNT) { 448 err = 13; 449 goto failed; 450 } 451 452 max_bytes = c->main_lebs * (long long)c->leb_size; 453 if (c->rp_size < 0 || max_bytes < c->rp_size) { 454 err = 14; 455 goto failed; 456 } 457 458 if (le32_to_cpu(sup->time_gran) > 1000000000 || 459 le32_to_cpu(sup->time_gran) < 1) { 460 err = 15; 461 goto failed; 462 } 463 464 return 0; 465 466 failed: 467 ubifs_err("bad superblock, error %d", err); 468 dbg_dump_node(c, sup); 469 return -EINVAL; 470 } 471 472 /** 473 * ubifs_read_sb_node - read superblock node. 474 * @c: UBIFS file-system description object 475 * 476 * This function returns a pointer to the superblock node or a negative error 477 * code. 478 */ 479 struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c) 480 { 481 struct ubifs_sb_node *sup; 482 int err; 483 484 sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS); 485 if (!sup) 486 return ERR_PTR(-ENOMEM); 487 488 err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ, 489 UBIFS_SB_LNUM, 0); 490 if (err) { 491 kfree(sup); 492 return ERR_PTR(err); 493 } 494 495 return sup; 496 } 497 498 /** 499 * ubifs_write_sb_node - write superblock node. 500 * @c: UBIFS file-system description object 501 * @sup: superblock node read with 'ubifs_read_sb_node()' 502 * 503 * This function returns %0 on success and a negative error code on failure. 504 */ 505 int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup) 506 { 507 int len = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size); 508 509 ubifs_prepare_node(c, sup, UBIFS_SB_NODE_SZ, 1); 510 return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len, UBI_LONGTERM); 511 } 512 513 /** 514 * ubifs_read_superblock - read superblock. 515 * @c: UBIFS file-system description object 516 * 517 * This function finds, reads and checks the superblock. If an empty UBI volume 518 * is being mounted, this function creates default superblock. Returns zero in 519 * case of success, and a negative error code in case of failure. 520 */ 521 int ubifs_read_superblock(struct ubifs_info *c) 522 { 523 int err, sup_flags; 524 struct ubifs_sb_node *sup; 525 526 if (c->empty) { 527 err = create_default_filesystem(c); 528 if (err) 529 return err; 530 } 531 532 sup = ubifs_read_sb_node(c); 533 if (IS_ERR(sup)) 534 return PTR_ERR(sup); 535 536 c->fmt_version = le32_to_cpu(sup->fmt_version); 537 c->ro_compat_version = le32_to_cpu(sup->ro_compat_version); 538 539 /* 540 * The software supports all previous versions but not future versions, 541 * due to the unavailability of time-travelling equipment. 542 */ 543 if (c->fmt_version > UBIFS_FORMAT_VERSION) { 544 struct super_block *sb = c->vfs_sb; 545 int mounting_ro = sb->s_flags & MS_RDONLY; 546 547 ubifs_assert(!c->ro_media || mounting_ro); 548 if (!mounting_ro || 549 c->ro_compat_version > UBIFS_RO_COMPAT_VERSION) { 550 ubifs_err("on-flash format version is w%d/r%d, but " 551 "software only supports up to version " 552 "w%d/r%d", c->fmt_version, 553 c->ro_compat_version, UBIFS_FORMAT_VERSION, 554 UBIFS_RO_COMPAT_VERSION); 555 if (c->ro_compat_version <= UBIFS_RO_COMPAT_VERSION) { 556 ubifs_msg("only R/O mounting is possible"); 557 err = -EROFS; 558 } else 559 err = -EINVAL; 560 goto out; 561 } 562 563 /* 564 * The FS is mounted R/O, and the media format is 565 * R/O-compatible with the UBIFS implementation, so we can 566 * mount. 567 */ 568 c->rw_incompat = 1; 569 } 570 571 if (c->fmt_version < 3) { 572 ubifs_err("on-flash format version %d is not supported", 573 c->fmt_version); 574 err = -EINVAL; 575 goto out; 576 } 577 578 switch (sup->key_hash) { 579 case UBIFS_KEY_HASH_R5: 580 c->key_hash = key_r5_hash; 581 c->key_hash_type = UBIFS_KEY_HASH_R5; 582 break; 583 584 case UBIFS_KEY_HASH_TEST: 585 c->key_hash = key_test_hash; 586 c->key_hash_type = UBIFS_KEY_HASH_TEST; 587 break; 588 }; 589 590 c->key_fmt = sup->key_fmt; 591 592 switch (c->key_fmt) { 593 case UBIFS_SIMPLE_KEY_FMT: 594 c->key_len = UBIFS_SK_LEN; 595 break; 596 default: 597 ubifs_err("unsupported key format"); 598 err = -EINVAL; 599 goto out; 600 } 601 602 c->leb_cnt = le32_to_cpu(sup->leb_cnt); 603 c->max_leb_cnt = le32_to_cpu(sup->max_leb_cnt); 604 c->max_bud_bytes = le64_to_cpu(sup->max_bud_bytes); 605 c->log_lebs = le32_to_cpu(sup->log_lebs); 606 c->lpt_lebs = le32_to_cpu(sup->lpt_lebs); 607 c->orph_lebs = le32_to_cpu(sup->orph_lebs); 608 c->jhead_cnt = le32_to_cpu(sup->jhead_cnt) + NONDATA_JHEADS_CNT; 609 c->fanout = le32_to_cpu(sup->fanout); 610 c->lsave_cnt = le32_to_cpu(sup->lsave_cnt); 611 c->rp_size = le64_to_cpu(sup->rp_size); 612 c->rp_uid = le32_to_cpu(sup->rp_uid); 613 c->rp_gid = le32_to_cpu(sup->rp_gid); 614 sup_flags = le32_to_cpu(sup->flags); 615 if (!c->mount_opts.override_compr) 616 c->default_compr = le16_to_cpu(sup->default_compr); 617 618 c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran); 619 memcpy(&c->uuid, &sup->uuid, 16); 620 c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT); 621 622 /* Automatically increase file system size to the maximum size */ 623 c->old_leb_cnt = c->leb_cnt; 624 if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) { 625 c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size); 626 if (c->vfs_sb->s_flags & MS_RDONLY) 627 dbg_mnt("Auto resizing (ro) from %d LEBs to %d LEBs", 628 c->old_leb_cnt, c->leb_cnt); 629 else { 630 dbg_mnt("Auto resizing (sb) from %d LEBs to %d LEBs", 631 c->old_leb_cnt, c->leb_cnt); 632 sup->leb_cnt = cpu_to_le32(c->leb_cnt); 633 err = ubifs_write_sb_node(c, sup); 634 if (err) 635 goto out; 636 c->old_leb_cnt = c->leb_cnt; 637 } 638 } 639 640 c->log_bytes = (long long)c->log_lebs * c->leb_size; 641 c->log_last = UBIFS_LOG_LNUM + c->log_lebs - 1; 642 c->lpt_first = UBIFS_LOG_LNUM + c->log_lebs; 643 c->lpt_last = c->lpt_first + c->lpt_lebs - 1; 644 c->orph_first = c->lpt_last + 1; 645 c->orph_last = c->orph_first + c->orph_lebs - 1; 646 c->main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS; 647 c->main_lebs -= c->log_lebs + c->lpt_lebs + c->orph_lebs; 648 c->main_first = c->leb_cnt - c->main_lebs; 649 650 err = validate_sb(c, sup); 651 out: 652 kfree(sup); 653 return err; 654 } 655