1 /* 2 * Copyright (c) 2012 Linutronix GmbH 3 * Copyright (c) 2014 sigma star gmbh 4 * Author: Richard Weinberger <richard@nod.at> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 */ 16 17 #include <linux/crc32.h> 18 #include <linux/bitmap.h> 19 #include "ubi.h" 20 21 /** 22 * init_seen - allocate memory for used for debugging. 23 * @ubi: UBI device description object 24 */ 25 static inline unsigned long *init_seen(struct ubi_device *ubi) 26 { 27 unsigned long *ret; 28 29 if (!ubi_dbg_chk_fastmap(ubi)) 30 return NULL; 31 32 ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long), 33 GFP_KERNEL); 34 if (!ret) 35 return ERR_PTR(-ENOMEM); 36 37 return ret; 38 } 39 40 /** 41 * free_seen - free the seen logic integer array. 42 * @seen: integer array of @ubi->peb_count size 43 */ 44 static inline void free_seen(unsigned long *seen) 45 { 46 kfree(seen); 47 } 48 49 /** 50 * set_seen - mark a PEB as seen. 51 * @ubi: UBI device description object 52 * @pnum: The PEB to be makred as seen 53 * @seen: integer array of @ubi->peb_count size 54 */ 55 static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen) 56 { 57 if (!ubi_dbg_chk_fastmap(ubi) || !seen) 58 return; 59 60 set_bit(pnum, seen); 61 } 62 63 /** 64 * self_check_seen - check whether all PEB have been seen by fastmap. 65 * @ubi: UBI device description object 66 * @seen: integer array of @ubi->peb_count size 67 */ 68 static int self_check_seen(struct ubi_device *ubi, unsigned long *seen) 69 { 70 int pnum, ret = 0; 71 72 if (!ubi_dbg_chk_fastmap(ubi) || !seen) 73 return 0; 74 75 for (pnum = 0; pnum < ubi->peb_count; pnum++) { 76 if (test_bit(pnum, seen) && ubi->lookuptbl[pnum]) { 77 ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum); 78 ret = -EINVAL; 79 } 80 } 81 82 return ret; 83 } 84 85 /** 86 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device. 87 * @ubi: UBI device description object 88 */ 89 size_t ubi_calc_fm_size(struct ubi_device *ubi) 90 { 91 size_t size; 92 93 size = sizeof(struct ubi_fm_sb) + 94 sizeof(struct ubi_fm_hdr) + 95 sizeof(struct ubi_fm_scan_pool) + 96 sizeof(struct ubi_fm_scan_pool) + 97 (ubi->peb_count * sizeof(struct ubi_fm_ec)) + 98 (sizeof(struct ubi_fm_eba) + 99 (ubi->peb_count * sizeof(__be32))) + 100 sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES; 101 return roundup(size, ubi->leb_size); 102 } 103 104 105 /** 106 * new_fm_vhdr - allocate a new volume header for fastmap usage. 107 * @ubi: UBI device description object 108 * @vol_id: the VID of the new header 109 * 110 * Returns a new struct ubi_vid_hdr on success. 111 * NULL indicates out of memory. 112 */ 113 static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id) 114 { 115 struct ubi_vid_io_buf *new; 116 struct ubi_vid_hdr *vh; 117 118 new = ubi_alloc_vid_buf(ubi, GFP_KERNEL); 119 if (!new) 120 goto out; 121 122 vh = ubi_get_vid_hdr(new); 123 vh->vol_type = UBI_VID_DYNAMIC; 124 vh->vol_id = cpu_to_be32(vol_id); 125 126 /* UBI implementations without fastmap support have to delete the 127 * fastmap. 128 */ 129 vh->compat = UBI_COMPAT_DELETE; 130 131 out: 132 return new; 133 } 134 135 /** 136 * add_aeb - create and add a attach erase block to a given list. 137 * @ai: UBI attach info object 138 * @list: the target list 139 * @pnum: PEB number of the new attach erase block 140 * @ec: erease counter of the new LEB 141 * @scrub: scrub this PEB after attaching 142 * 143 * Returns 0 on success, < 0 indicates an internal error. 144 */ 145 static int add_aeb(struct ubi_attach_info *ai, struct list_head *list, 146 int pnum, int ec, int scrub) 147 { 148 struct ubi_ainf_peb *aeb; 149 150 aeb = ubi_alloc_aeb(ai, pnum, ec); 151 if (!aeb) 152 return -ENOMEM; 153 154 aeb->lnum = -1; 155 aeb->scrub = scrub; 156 aeb->copy_flag = aeb->sqnum = 0; 157 158 ai->ec_sum += aeb->ec; 159 ai->ec_count++; 160 161 if (ai->max_ec < aeb->ec) 162 ai->max_ec = aeb->ec; 163 164 if (ai->min_ec > aeb->ec) 165 ai->min_ec = aeb->ec; 166 167 list_add_tail(&aeb->u.list, list); 168 169 return 0; 170 } 171 172 /** 173 * add_vol - create and add a new volume to ubi_attach_info. 174 * @ai: ubi_attach_info object 175 * @vol_id: VID of the new volume 176 * @used_ebs: number of used EBS 177 * @data_pad: data padding value of the new volume 178 * @vol_type: volume type 179 * @last_eb_bytes: number of bytes in the last LEB 180 * 181 * Returns the new struct ubi_ainf_volume on success. 182 * NULL indicates an error. 183 */ 184 static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id, 185 int used_ebs, int data_pad, u8 vol_type, 186 int last_eb_bytes) 187 { 188 struct ubi_ainf_volume *av; 189 190 av = ubi_add_av(ai, vol_id); 191 if (IS_ERR(av)) 192 return av; 193 194 av->data_pad = data_pad; 195 av->last_data_size = last_eb_bytes; 196 av->compat = 0; 197 av->vol_type = vol_type; 198 if (av->vol_type == UBI_STATIC_VOLUME) 199 av->used_ebs = used_ebs; 200 201 dbg_bld("found volume (ID %i)", vol_id); 202 return av; 203 } 204 205 /** 206 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it 207 * from it's original list. 208 * @ai: ubi_attach_info object 209 * @aeb: the to be assigned SEB 210 * @av: target scan volume 211 */ 212 static void assign_aeb_to_av(struct ubi_attach_info *ai, 213 struct ubi_ainf_peb *aeb, 214 struct ubi_ainf_volume *av) 215 { 216 struct ubi_ainf_peb *tmp_aeb; 217 struct rb_node **p = &ai->volumes.rb_node, *parent = NULL; 218 219 p = &av->root.rb_node; 220 while (*p) { 221 parent = *p; 222 223 tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); 224 if (aeb->lnum != tmp_aeb->lnum) { 225 if (aeb->lnum < tmp_aeb->lnum) 226 p = &(*p)->rb_left; 227 else 228 p = &(*p)->rb_right; 229 230 continue; 231 } else 232 break; 233 } 234 235 list_del(&aeb->u.list); 236 av->leb_count++; 237 238 rb_link_node(&aeb->u.rb, parent, p); 239 rb_insert_color(&aeb->u.rb, &av->root); 240 } 241 242 /** 243 * update_vol - inserts or updates a LEB which was found a pool. 244 * @ubi: the UBI device object 245 * @ai: attach info object 246 * @av: the volume this LEB belongs to 247 * @new_vh: the volume header derived from new_aeb 248 * @new_aeb: the AEB to be examined 249 * 250 * Returns 0 on success, < 0 indicates an internal error. 251 */ 252 static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai, 253 struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh, 254 struct ubi_ainf_peb *new_aeb) 255 { 256 struct rb_node **p = &av->root.rb_node, *parent = NULL; 257 struct ubi_ainf_peb *aeb, *victim; 258 int cmp_res; 259 260 while (*p) { 261 parent = *p; 262 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); 263 264 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) { 265 if (be32_to_cpu(new_vh->lnum) < aeb->lnum) 266 p = &(*p)->rb_left; 267 else 268 p = &(*p)->rb_right; 269 270 continue; 271 } 272 273 /* This case can happen if the fastmap gets written 274 * because of a volume change (creation, deletion, ..). 275 * Then a PEB can be within the persistent EBA and the pool. 276 */ 277 if (aeb->pnum == new_aeb->pnum) { 278 ubi_assert(aeb->lnum == new_aeb->lnum); 279 ubi_free_aeb(ai, new_aeb); 280 281 return 0; 282 } 283 284 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh); 285 if (cmp_res < 0) 286 return cmp_res; 287 288 /* new_aeb is newer */ 289 if (cmp_res & 1) { 290 victim = ubi_alloc_aeb(ai, aeb->pnum, aeb->ec); 291 if (!victim) 292 return -ENOMEM; 293 294 list_add_tail(&victim->u.list, &ai->erase); 295 296 if (av->highest_lnum == be32_to_cpu(new_vh->lnum)) 297 av->last_data_size = 298 be32_to_cpu(new_vh->data_size); 299 300 dbg_bld("vol %i: AEB %i's PEB %i is the newer", 301 av->vol_id, aeb->lnum, new_aeb->pnum); 302 303 aeb->ec = new_aeb->ec; 304 aeb->pnum = new_aeb->pnum; 305 aeb->copy_flag = new_vh->copy_flag; 306 aeb->scrub = new_aeb->scrub; 307 aeb->sqnum = new_aeb->sqnum; 308 ubi_free_aeb(ai, new_aeb); 309 310 /* new_aeb is older */ 311 } else { 312 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it", 313 av->vol_id, aeb->lnum, new_aeb->pnum); 314 list_add_tail(&new_aeb->u.list, &ai->erase); 315 } 316 317 return 0; 318 } 319 /* This LEB is new, let's add it to the volume */ 320 321 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) { 322 av->highest_lnum = be32_to_cpu(new_vh->lnum); 323 av->last_data_size = be32_to_cpu(new_vh->data_size); 324 } 325 326 if (av->vol_type == UBI_STATIC_VOLUME) 327 av->used_ebs = be32_to_cpu(new_vh->used_ebs); 328 329 av->leb_count++; 330 331 rb_link_node(&new_aeb->u.rb, parent, p); 332 rb_insert_color(&new_aeb->u.rb, &av->root); 333 334 return 0; 335 } 336 337 /** 338 * process_pool_aeb - we found a non-empty PEB in a pool. 339 * @ubi: UBI device object 340 * @ai: attach info object 341 * @new_vh: the volume header derived from new_aeb 342 * @new_aeb: the AEB to be examined 343 * 344 * Returns 0 on success, < 0 indicates an internal error. 345 */ 346 static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai, 347 struct ubi_vid_hdr *new_vh, 348 struct ubi_ainf_peb *new_aeb) 349 { 350 int vol_id = be32_to_cpu(new_vh->vol_id); 351 struct ubi_ainf_volume *av; 352 353 if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) { 354 ubi_free_aeb(ai, new_aeb); 355 356 return 0; 357 } 358 359 /* Find the volume this SEB belongs to */ 360 av = ubi_find_av(ai, vol_id); 361 if (!av) { 362 ubi_err(ubi, "orphaned volume in fastmap pool!"); 363 ubi_free_aeb(ai, new_aeb); 364 return UBI_BAD_FASTMAP; 365 } 366 367 ubi_assert(vol_id == av->vol_id); 368 369 return update_vol(ubi, ai, av, new_vh, new_aeb); 370 } 371 372 /** 373 * unmap_peb - unmap a PEB. 374 * If fastmap detects a free PEB in the pool it has to check whether 375 * this PEB has been unmapped after writing the fastmap. 376 * 377 * @ai: UBI attach info object 378 * @pnum: The PEB to be unmapped 379 */ 380 static void unmap_peb(struct ubi_attach_info *ai, int pnum) 381 { 382 struct ubi_ainf_volume *av; 383 struct rb_node *node, *node2; 384 struct ubi_ainf_peb *aeb; 385 386 ubi_rb_for_each_entry(node, av, &ai->volumes, rb) { 387 ubi_rb_for_each_entry(node2, aeb, &av->root, u.rb) { 388 if (aeb->pnum == pnum) { 389 rb_erase(&aeb->u.rb, &av->root); 390 av->leb_count--; 391 ubi_free_aeb(ai, aeb); 392 return; 393 } 394 } 395 } 396 } 397 398 /** 399 * scan_pool - scans a pool for changed (no longer empty PEBs). 400 * @ubi: UBI device object 401 * @ai: attach info object 402 * @pebs: an array of all PEB numbers in the to be scanned pool 403 * @pool_size: size of the pool (number of entries in @pebs) 404 * @max_sqnum: pointer to the maximal sequence number 405 * @free: list of PEBs which are most likely free (and go into @ai->free) 406 * 407 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned. 408 * < 0 indicates an internal error. 409 */ 410 static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai, 411 __be32 *pebs, int pool_size, unsigned long long *max_sqnum, 412 struct list_head *free) 413 { 414 struct ubi_vid_io_buf *vb; 415 struct ubi_vid_hdr *vh; 416 struct ubi_ec_hdr *ech; 417 struct ubi_ainf_peb *new_aeb; 418 int i, pnum, err, ret = 0; 419 420 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 421 if (!ech) 422 return -ENOMEM; 423 424 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL); 425 if (!vb) { 426 kfree(ech); 427 return -ENOMEM; 428 } 429 430 vh = ubi_get_vid_hdr(vb); 431 432 dbg_bld("scanning fastmap pool: size = %i", pool_size); 433 434 /* 435 * Now scan all PEBs in the pool to find changes which have been made 436 * after the creation of the fastmap 437 */ 438 for (i = 0; i < pool_size; i++) { 439 int scrub = 0; 440 int image_seq; 441 442 pnum = be32_to_cpu(pebs[i]); 443 444 if (ubi_io_is_bad(ubi, pnum)) { 445 ubi_err(ubi, "bad PEB in fastmap pool!"); 446 ret = UBI_BAD_FASTMAP; 447 goto out; 448 } 449 450 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); 451 if (err && err != UBI_IO_BITFLIPS) { 452 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i", 453 pnum, err); 454 ret = err > 0 ? UBI_BAD_FASTMAP : err; 455 goto out; 456 } else if (err == UBI_IO_BITFLIPS) 457 scrub = 1; 458 459 /* 460 * Older UBI implementations have image_seq set to zero, so 461 * we shouldn't fail if image_seq == 0. 462 */ 463 image_seq = be32_to_cpu(ech->image_seq); 464 465 if (image_seq && (image_seq != ubi->image_seq)) { 466 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x", 467 be32_to_cpu(ech->image_seq), ubi->image_seq); 468 ret = UBI_BAD_FASTMAP; 469 goto out; 470 } 471 472 err = ubi_io_read_vid_hdr(ubi, pnum, vb, 0); 473 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) { 474 unsigned long long ec = be64_to_cpu(ech->ec); 475 unmap_peb(ai, pnum); 476 dbg_bld("Adding PEB to free: %i", pnum); 477 478 if (err == UBI_IO_FF_BITFLIPS) 479 scrub = 1; 480 481 add_aeb(ai, free, pnum, ec, scrub); 482 continue; 483 } else if (err == 0 || err == UBI_IO_BITFLIPS) { 484 dbg_bld("Found non empty PEB:%i in pool", pnum); 485 486 if (err == UBI_IO_BITFLIPS) 487 scrub = 1; 488 489 new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec)); 490 if (!new_aeb) { 491 ret = -ENOMEM; 492 goto out; 493 } 494 495 new_aeb->lnum = be32_to_cpu(vh->lnum); 496 new_aeb->sqnum = be64_to_cpu(vh->sqnum); 497 new_aeb->copy_flag = vh->copy_flag; 498 new_aeb->scrub = scrub; 499 500 if (*max_sqnum < new_aeb->sqnum) 501 *max_sqnum = new_aeb->sqnum; 502 503 err = process_pool_aeb(ubi, ai, vh, new_aeb); 504 if (err) { 505 ret = err > 0 ? UBI_BAD_FASTMAP : err; 506 goto out; 507 } 508 } else { 509 /* We are paranoid and fall back to scanning mode */ 510 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!"); 511 ret = err > 0 ? UBI_BAD_FASTMAP : err; 512 goto out; 513 } 514 515 } 516 517 out: 518 ubi_free_vid_buf(vb); 519 kfree(ech); 520 return ret; 521 } 522 523 /** 524 * count_fastmap_pebs - Counts the PEBs found by fastmap. 525 * @ai: The UBI attach info object 526 */ 527 static int count_fastmap_pebs(struct ubi_attach_info *ai) 528 { 529 struct ubi_ainf_peb *aeb; 530 struct ubi_ainf_volume *av; 531 struct rb_node *rb1, *rb2; 532 int n = 0; 533 534 list_for_each_entry(aeb, &ai->erase, u.list) 535 n++; 536 537 list_for_each_entry(aeb, &ai->free, u.list) 538 n++; 539 540 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) 541 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) 542 n++; 543 544 return n; 545 } 546 547 /** 548 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap. 549 * @ubi: UBI device object 550 * @ai: UBI attach info object 551 * @fm: the fastmap to be attached 552 * 553 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable. 554 * < 0 indicates an internal error. 555 */ 556 static int ubi_attach_fastmap(struct ubi_device *ubi, 557 struct ubi_attach_info *ai, 558 struct ubi_fastmap_layout *fm) 559 { 560 struct list_head used, free; 561 struct ubi_ainf_volume *av; 562 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb; 563 struct ubi_fm_sb *fmsb; 564 struct ubi_fm_hdr *fmhdr; 565 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 566 struct ubi_fm_ec *fmec; 567 struct ubi_fm_volhdr *fmvhdr; 568 struct ubi_fm_eba *fm_eba; 569 int ret, i, j, pool_size, wl_pool_size; 570 size_t fm_pos = 0, fm_size = ubi->fm_size; 571 unsigned long long max_sqnum = 0; 572 void *fm_raw = ubi->fm_buf; 573 574 INIT_LIST_HEAD(&used); 575 INIT_LIST_HEAD(&free); 576 ai->min_ec = UBI_MAX_ERASECOUNTER; 577 578 fmsb = (struct ubi_fm_sb *)(fm_raw); 579 ai->max_sqnum = fmsb->sqnum; 580 fm_pos += sizeof(struct ubi_fm_sb); 581 if (fm_pos >= fm_size) 582 goto fail_bad; 583 584 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 585 fm_pos += sizeof(*fmhdr); 586 if (fm_pos >= fm_size) 587 goto fail_bad; 588 589 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) { 590 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x", 591 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC); 592 goto fail_bad; 593 } 594 595 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 596 fm_pos += sizeof(*fmpl); 597 if (fm_pos >= fm_size) 598 goto fail_bad; 599 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) { 600 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x", 601 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC); 602 goto fail_bad; 603 } 604 605 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 606 fm_pos += sizeof(*fmpl_wl); 607 if (fm_pos >= fm_size) 608 goto fail_bad; 609 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) { 610 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x", 611 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC); 612 goto fail_bad; 613 } 614 615 pool_size = be16_to_cpu(fmpl->size); 616 wl_pool_size = be16_to_cpu(fmpl_wl->size); 617 fm->max_pool_size = be16_to_cpu(fmpl->max_size); 618 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size); 619 620 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) { 621 ubi_err(ubi, "bad pool size: %i", pool_size); 622 goto fail_bad; 623 } 624 625 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) { 626 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size); 627 goto fail_bad; 628 } 629 630 631 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE || 632 fm->max_pool_size < 0) { 633 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size); 634 goto fail_bad; 635 } 636 637 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE || 638 fm->max_wl_pool_size < 0) { 639 ubi_err(ubi, "bad maximal WL pool size: %i", 640 fm->max_wl_pool_size); 641 goto fail_bad; 642 } 643 644 /* read EC values from free list */ 645 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) { 646 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 647 fm_pos += sizeof(*fmec); 648 if (fm_pos >= fm_size) 649 goto fail_bad; 650 651 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum), 652 be32_to_cpu(fmec->ec), 0); 653 } 654 655 /* read EC values from used list */ 656 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) { 657 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 658 fm_pos += sizeof(*fmec); 659 if (fm_pos >= fm_size) 660 goto fail_bad; 661 662 add_aeb(ai, &used, be32_to_cpu(fmec->pnum), 663 be32_to_cpu(fmec->ec), 0); 664 } 665 666 /* read EC values from scrub list */ 667 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) { 668 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 669 fm_pos += sizeof(*fmec); 670 if (fm_pos >= fm_size) 671 goto fail_bad; 672 673 add_aeb(ai, &used, be32_to_cpu(fmec->pnum), 674 be32_to_cpu(fmec->ec), 1); 675 } 676 677 /* read EC values from erase list */ 678 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) { 679 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 680 fm_pos += sizeof(*fmec); 681 if (fm_pos >= fm_size) 682 goto fail_bad; 683 684 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum), 685 be32_to_cpu(fmec->ec), 1); 686 } 687 688 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count); 689 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count); 690 691 /* Iterate over all volumes and read their EBA table */ 692 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) { 693 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); 694 fm_pos += sizeof(*fmvhdr); 695 if (fm_pos >= fm_size) 696 goto fail_bad; 697 698 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) { 699 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x", 700 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC); 701 goto fail_bad; 702 } 703 704 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id), 705 be32_to_cpu(fmvhdr->used_ebs), 706 be32_to_cpu(fmvhdr->data_pad), 707 fmvhdr->vol_type, 708 be32_to_cpu(fmvhdr->last_eb_bytes)); 709 710 if (IS_ERR(av)) { 711 if (PTR_ERR(av) == -EEXIST) 712 ubi_err(ubi, "volume (ID %i) already exists", 713 fmvhdr->vol_id); 714 715 goto fail_bad; 716 } 717 718 ai->vols_found++; 719 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id)) 720 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id); 721 722 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos); 723 fm_pos += sizeof(*fm_eba); 724 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs)); 725 if (fm_pos >= fm_size) 726 goto fail_bad; 727 728 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) { 729 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x", 730 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC); 731 goto fail_bad; 732 } 733 734 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) { 735 int pnum = be32_to_cpu(fm_eba->pnum[j]); 736 737 if (pnum < 0) 738 continue; 739 740 aeb = NULL; 741 list_for_each_entry(tmp_aeb, &used, u.list) { 742 if (tmp_aeb->pnum == pnum) { 743 aeb = tmp_aeb; 744 break; 745 } 746 } 747 748 if (!aeb) { 749 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum); 750 goto fail_bad; 751 } 752 753 aeb->lnum = j; 754 755 if (av->highest_lnum <= aeb->lnum) 756 av->highest_lnum = aeb->lnum; 757 758 assign_aeb_to_av(ai, aeb, av); 759 760 dbg_bld("inserting PEB:%i (LEB %i) to vol %i", 761 aeb->pnum, aeb->lnum, av->vol_id); 762 } 763 } 764 765 ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free); 766 if (ret) 767 goto fail; 768 769 ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free); 770 if (ret) 771 goto fail; 772 773 if (max_sqnum > ai->max_sqnum) 774 ai->max_sqnum = max_sqnum; 775 776 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) 777 list_move_tail(&tmp_aeb->u.list, &ai->free); 778 779 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) 780 list_move_tail(&tmp_aeb->u.list, &ai->erase); 781 782 ubi_assert(list_empty(&free)); 783 784 /* 785 * If fastmap is leaking PEBs (must not happen), raise a 786 * fat warning and fall back to scanning mode. 787 * We do this here because in ubi_wl_init() it's too late 788 * and we cannot fall back to scanning. 789 */ 790 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count - 791 ai->bad_peb_count - fm->used_blocks)) 792 goto fail_bad; 793 794 return 0; 795 796 fail_bad: 797 ret = UBI_BAD_FASTMAP; 798 fail: 799 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) { 800 list_del(&tmp_aeb->u.list); 801 ubi_free_aeb(ai, tmp_aeb); 802 } 803 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) { 804 list_del(&tmp_aeb->u.list); 805 ubi_free_aeb(ai, tmp_aeb); 806 } 807 808 return ret; 809 } 810 811 /** 812 * find_fm_anchor - find the most recent Fastmap superblock (anchor) 813 * @ai: UBI attach info to be filled 814 */ 815 static int find_fm_anchor(struct ubi_attach_info *ai) 816 { 817 int ret = -1; 818 struct ubi_ainf_peb *aeb; 819 unsigned long long max_sqnum = 0; 820 821 list_for_each_entry(aeb, &ai->fastmap, u.list) { 822 if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) { 823 max_sqnum = aeb->sqnum; 824 ret = aeb->pnum; 825 } 826 } 827 828 return ret; 829 } 830 831 /** 832 * ubi_scan_fastmap - scan the fastmap. 833 * @ubi: UBI device object 834 * @ai: UBI attach info to be filled 835 * @scan_ai: UBI attach info from the first 64 PEBs, 836 * used to find the most recent Fastmap data structure 837 * 838 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found, 839 * UBI_BAD_FASTMAP if one was found but is not usable. 840 * < 0 indicates an internal error. 841 */ 842 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, 843 struct ubi_attach_info *scan_ai) 844 { 845 struct ubi_fm_sb *fmsb, *fmsb2; 846 struct ubi_vid_io_buf *vb; 847 struct ubi_vid_hdr *vh; 848 struct ubi_ec_hdr *ech; 849 struct ubi_fastmap_layout *fm; 850 struct ubi_ainf_peb *tmp_aeb, *aeb; 851 int i, used_blocks, pnum, fm_anchor, ret = 0; 852 size_t fm_size; 853 __be32 crc, tmp_crc; 854 unsigned long long sqnum = 0; 855 856 fm_anchor = find_fm_anchor(scan_ai); 857 if (fm_anchor < 0) 858 return UBI_NO_FASTMAP; 859 860 /* Move all (possible) fastmap blocks into our new attach structure. */ 861 list_for_each_entry_safe(aeb, tmp_aeb, &scan_ai->fastmap, u.list) 862 list_move_tail(&aeb->u.list, &ai->fastmap); 863 864 down_write(&ubi->fm_protect); 865 memset(ubi->fm_buf, 0, ubi->fm_size); 866 867 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL); 868 if (!fmsb) { 869 ret = -ENOMEM; 870 goto out; 871 } 872 873 fm = kzalloc(sizeof(*fm), GFP_KERNEL); 874 if (!fm) { 875 ret = -ENOMEM; 876 kfree(fmsb); 877 goto out; 878 } 879 880 ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb)); 881 if (ret && ret != UBI_IO_BITFLIPS) 882 goto free_fm_sb; 883 else if (ret == UBI_IO_BITFLIPS) 884 fm->to_be_tortured[0] = 1; 885 886 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) { 887 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x", 888 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC); 889 ret = UBI_BAD_FASTMAP; 890 goto free_fm_sb; 891 } 892 893 if (fmsb->version != UBI_FM_FMT_VERSION) { 894 ubi_err(ubi, "bad fastmap version: %i, expected: %i", 895 fmsb->version, UBI_FM_FMT_VERSION); 896 ret = UBI_BAD_FASTMAP; 897 goto free_fm_sb; 898 } 899 900 used_blocks = be32_to_cpu(fmsb->used_blocks); 901 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) { 902 ubi_err(ubi, "number of fastmap blocks is invalid: %i", 903 used_blocks); 904 ret = UBI_BAD_FASTMAP; 905 goto free_fm_sb; 906 } 907 908 fm_size = ubi->leb_size * used_blocks; 909 if (fm_size != ubi->fm_size) { 910 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi", 911 fm_size, ubi->fm_size); 912 ret = UBI_BAD_FASTMAP; 913 goto free_fm_sb; 914 } 915 916 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 917 if (!ech) { 918 ret = -ENOMEM; 919 goto free_fm_sb; 920 } 921 922 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL); 923 if (!vb) { 924 ret = -ENOMEM; 925 goto free_hdr; 926 } 927 928 vh = ubi_get_vid_hdr(vb); 929 930 for (i = 0; i < used_blocks; i++) { 931 int image_seq; 932 933 pnum = be32_to_cpu(fmsb->block_loc[i]); 934 935 if (ubi_io_is_bad(ubi, pnum)) { 936 ret = UBI_BAD_FASTMAP; 937 goto free_hdr; 938 } 939 940 if (i == 0 && pnum != fm_anchor) { 941 ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i", 942 pnum, fm_anchor); 943 ret = UBI_BAD_FASTMAP; 944 goto free_hdr; 945 } 946 947 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); 948 if (ret && ret != UBI_IO_BITFLIPS) { 949 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)", 950 i, pnum); 951 if (ret > 0) 952 ret = UBI_BAD_FASTMAP; 953 goto free_hdr; 954 } else if (ret == UBI_IO_BITFLIPS) 955 fm->to_be_tortured[i] = 1; 956 957 image_seq = be32_to_cpu(ech->image_seq); 958 if (!ubi->image_seq) 959 ubi->image_seq = image_seq; 960 961 /* 962 * Older UBI implementations have image_seq set to zero, so 963 * we shouldn't fail if image_seq == 0. 964 */ 965 if (image_seq && (image_seq != ubi->image_seq)) { 966 ubi_err(ubi, "wrong image seq:%d instead of %d", 967 be32_to_cpu(ech->image_seq), ubi->image_seq); 968 ret = UBI_BAD_FASTMAP; 969 goto free_hdr; 970 } 971 972 ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0); 973 if (ret && ret != UBI_IO_BITFLIPS) { 974 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)", 975 i, pnum); 976 goto free_hdr; 977 } 978 979 if (i == 0) { 980 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) { 981 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x", 982 be32_to_cpu(vh->vol_id), 983 UBI_FM_SB_VOLUME_ID); 984 ret = UBI_BAD_FASTMAP; 985 goto free_hdr; 986 } 987 } else { 988 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) { 989 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x", 990 be32_to_cpu(vh->vol_id), 991 UBI_FM_DATA_VOLUME_ID); 992 ret = UBI_BAD_FASTMAP; 993 goto free_hdr; 994 } 995 } 996 997 if (sqnum < be64_to_cpu(vh->sqnum)) 998 sqnum = be64_to_cpu(vh->sqnum); 999 1000 ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i), 1001 pnum, 0, ubi->leb_size); 1002 if (ret && ret != UBI_IO_BITFLIPS) { 1003 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, " 1004 "err: %i)", i, pnum, ret); 1005 goto free_hdr; 1006 } 1007 } 1008 1009 kfree(fmsb); 1010 fmsb = NULL; 1011 1012 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf); 1013 tmp_crc = be32_to_cpu(fmsb2->data_crc); 1014 fmsb2->data_crc = 0; 1015 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size); 1016 if (crc != tmp_crc) { 1017 ubi_err(ubi, "fastmap data CRC is invalid"); 1018 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x", 1019 tmp_crc, crc); 1020 ret = UBI_BAD_FASTMAP; 1021 goto free_hdr; 1022 } 1023 1024 fmsb2->sqnum = sqnum; 1025 1026 fm->used_blocks = used_blocks; 1027 1028 ret = ubi_attach_fastmap(ubi, ai, fm); 1029 if (ret) { 1030 if (ret > 0) 1031 ret = UBI_BAD_FASTMAP; 1032 goto free_hdr; 1033 } 1034 1035 for (i = 0; i < used_blocks; i++) { 1036 struct ubi_wl_entry *e; 1037 1038 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL); 1039 if (!e) { 1040 while (i--) 1041 kfree(fm->e[i]); 1042 1043 ret = -ENOMEM; 1044 goto free_hdr; 1045 } 1046 1047 e->pnum = be32_to_cpu(fmsb2->block_loc[i]); 1048 e->ec = be32_to_cpu(fmsb2->block_ec[i]); 1049 fm->e[i] = e; 1050 } 1051 1052 ubi->fm = fm; 1053 ubi->fm_pool.max_size = ubi->fm->max_pool_size; 1054 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size; 1055 ubi_msg(ubi, "attached by fastmap"); 1056 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size); 1057 ubi_msg(ubi, "fastmap WL pool size: %d", 1058 ubi->fm_wl_pool.max_size); 1059 ubi->fm_disabled = 0; 1060 ubi->fast_attach = 1; 1061 1062 ubi_free_vid_buf(vb); 1063 kfree(ech); 1064 out: 1065 up_write(&ubi->fm_protect); 1066 if (ret == UBI_BAD_FASTMAP) 1067 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!"); 1068 return ret; 1069 1070 free_hdr: 1071 ubi_free_vid_buf(vb); 1072 kfree(ech); 1073 free_fm_sb: 1074 kfree(fmsb); 1075 kfree(fm); 1076 goto out; 1077 } 1078 1079 /** 1080 * ubi_write_fastmap - writes a fastmap. 1081 * @ubi: UBI device object 1082 * @new_fm: the to be written fastmap 1083 * 1084 * Returns 0 on success, < 0 indicates an internal error. 1085 */ 1086 static int ubi_write_fastmap(struct ubi_device *ubi, 1087 struct ubi_fastmap_layout *new_fm) 1088 { 1089 size_t fm_pos = 0; 1090 void *fm_raw; 1091 struct ubi_fm_sb *fmsb; 1092 struct ubi_fm_hdr *fmh; 1093 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 1094 struct ubi_fm_ec *fec; 1095 struct ubi_fm_volhdr *fvh; 1096 struct ubi_fm_eba *feba; 1097 struct ubi_wl_entry *wl_e; 1098 struct ubi_volume *vol; 1099 struct ubi_vid_io_buf *avbuf, *dvbuf; 1100 struct ubi_vid_hdr *avhdr, *dvhdr; 1101 struct ubi_work *ubi_wrk; 1102 struct rb_node *tmp_rb; 1103 int ret, i, j, free_peb_count, used_peb_count, vol_count; 1104 int scrub_peb_count, erase_peb_count; 1105 unsigned long *seen_pebs = NULL; 1106 1107 fm_raw = ubi->fm_buf; 1108 memset(ubi->fm_buf, 0, ubi->fm_size); 1109 1110 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1111 if (!avbuf) { 1112 ret = -ENOMEM; 1113 goto out; 1114 } 1115 1116 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID); 1117 if (!dvbuf) { 1118 ret = -ENOMEM; 1119 goto out_kfree; 1120 } 1121 1122 avhdr = ubi_get_vid_hdr(avbuf); 1123 dvhdr = ubi_get_vid_hdr(dvbuf); 1124 1125 seen_pebs = init_seen(ubi); 1126 if (IS_ERR(seen_pebs)) { 1127 ret = PTR_ERR(seen_pebs); 1128 goto out_kfree; 1129 } 1130 1131 spin_lock(&ubi->volumes_lock); 1132 spin_lock(&ubi->wl_lock); 1133 1134 fmsb = (struct ubi_fm_sb *)fm_raw; 1135 fm_pos += sizeof(*fmsb); 1136 ubi_assert(fm_pos <= ubi->fm_size); 1137 1138 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 1139 fm_pos += sizeof(*fmh); 1140 ubi_assert(fm_pos <= ubi->fm_size); 1141 1142 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC); 1143 fmsb->version = UBI_FM_FMT_VERSION; 1144 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks); 1145 /* the max sqnum will be filled in while *reading* the fastmap */ 1146 fmsb->sqnum = 0; 1147 1148 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC); 1149 free_peb_count = 0; 1150 used_peb_count = 0; 1151 scrub_peb_count = 0; 1152 erase_peb_count = 0; 1153 vol_count = 0; 1154 1155 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1156 fm_pos += sizeof(*fmpl); 1157 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1158 fmpl->size = cpu_to_be16(ubi->fm_pool.size); 1159 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size); 1160 1161 for (i = 0; i < ubi->fm_pool.size; i++) { 1162 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]); 1163 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs); 1164 } 1165 1166 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1167 fm_pos += sizeof(*fmpl_wl); 1168 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1169 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size); 1170 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size); 1171 1172 for (i = 0; i < ubi->fm_wl_pool.size; i++) { 1173 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]); 1174 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs); 1175 } 1176 1177 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) { 1178 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1179 1180 fec->pnum = cpu_to_be32(wl_e->pnum); 1181 set_seen(ubi, wl_e->pnum, seen_pebs); 1182 fec->ec = cpu_to_be32(wl_e->ec); 1183 1184 free_peb_count++; 1185 fm_pos += sizeof(*fec); 1186 ubi_assert(fm_pos <= ubi->fm_size); 1187 } 1188 fmh->free_peb_count = cpu_to_be32(free_peb_count); 1189 1190 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) { 1191 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1192 1193 fec->pnum = cpu_to_be32(wl_e->pnum); 1194 set_seen(ubi, wl_e->pnum, seen_pebs); 1195 fec->ec = cpu_to_be32(wl_e->ec); 1196 1197 used_peb_count++; 1198 fm_pos += sizeof(*fec); 1199 ubi_assert(fm_pos <= ubi->fm_size); 1200 } 1201 1202 ubi_for_each_protected_peb(ubi, i, wl_e) { 1203 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1204 1205 fec->pnum = cpu_to_be32(wl_e->pnum); 1206 set_seen(ubi, wl_e->pnum, seen_pebs); 1207 fec->ec = cpu_to_be32(wl_e->ec); 1208 1209 used_peb_count++; 1210 fm_pos += sizeof(*fec); 1211 ubi_assert(fm_pos <= ubi->fm_size); 1212 } 1213 fmh->used_peb_count = cpu_to_be32(used_peb_count); 1214 1215 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) { 1216 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1217 1218 fec->pnum = cpu_to_be32(wl_e->pnum); 1219 set_seen(ubi, wl_e->pnum, seen_pebs); 1220 fec->ec = cpu_to_be32(wl_e->ec); 1221 1222 scrub_peb_count++; 1223 fm_pos += sizeof(*fec); 1224 ubi_assert(fm_pos <= ubi->fm_size); 1225 } 1226 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count); 1227 1228 1229 list_for_each_entry(ubi_wrk, &ubi->works, list) { 1230 if (ubi_is_erase_work(ubi_wrk)) { 1231 wl_e = ubi_wrk->e; 1232 ubi_assert(wl_e); 1233 1234 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1235 1236 fec->pnum = cpu_to_be32(wl_e->pnum); 1237 set_seen(ubi, wl_e->pnum, seen_pebs); 1238 fec->ec = cpu_to_be32(wl_e->ec); 1239 1240 erase_peb_count++; 1241 fm_pos += sizeof(*fec); 1242 ubi_assert(fm_pos <= ubi->fm_size); 1243 } 1244 } 1245 fmh->erase_peb_count = cpu_to_be32(erase_peb_count); 1246 1247 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) { 1248 vol = ubi->volumes[i]; 1249 1250 if (!vol) 1251 continue; 1252 1253 vol_count++; 1254 1255 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); 1256 fm_pos += sizeof(*fvh); 1257 ubi_assert(fm_pos <= ubi->fm_size); 1258 1259 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC); 1260 fvh->vol_id = cpu_to_be32(vol->vol_id); 1261 fvh->vol_type = vol->vol_type; 1262 fvh->used_ebs = cpu_to_be32(vol->used_ebs); 1263 fvh->data_pad = cpu_to_be32(vol->data_pad); 1264 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes); 1265 1266 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME || 1267 vol->vol_type == UBI_STATIC_VOLUME); 1268 1269 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos); 1270 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs); 1271 ubi_assert(fm_pos <= ubi->fm_size); 1272 1273 for (j = 0; j < vol->reserved_pebs; j++) { 1274 struct ubi_eba_leb_desc ldesc; 1275 1276 ubi_eba_get_ldesc(vol, j, &ldesc); 1277 feba->pnum[j] = cpu_to_be32(ldesc.pnum); 1278 } 1279 1280 feba->reserved_pebs = cpu_to_be32(j); 1281 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC); 1282 } 1283 fmh->vol_count = cpu_to_be32(vol_count); 1284 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count); 1285 1286 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1287 avhdr->lnum = 0; 1288 1289 spin_unlock(&ubi->wl_lock); 1290 spin_unlock(&ubi->volumes_lock); 1291 1292 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum); 1293 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf); 1294 if (ret) { 1295 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!"); 1296 goto out_kfree; 1297 } 1298 1299 for (i = 0; i < new_fm->used_blocks; i++) { 1300 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum); 1301 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs); 1302 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec); 1303 } 1304 1305 fmsb->data_crc = 0; 1306 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw, 1307 ubi->fm_size)); 1308 1309 for (i = 1; i < new_fm->used_blocks; i++) { 1310 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1311 dvhdr->lnum = cpu_to_be32(i); 1312 dbg_bld("writing fastmap data to PEB %i sqnum %llu", 1313 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum)); 1314 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf); 1315 if (ret) { 1316 ubi_err(ubi, "unable to write vid_hdr to PEB %i!", 1317 new_fm->e[i]->pnum); 1318 goto out_kfree; 1319 } 1320 } 1321 1322 for (i = 0; i < new_fm->used_blocks; i++) { 1323 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size), 1324 new_fm->e[i]->pnum, 0, ubi->leb_size); 1325 if (ret) { 1326 ubi_err(ubi, "unable to write fastmap to PEB %i!", 1327 new_fm->e[i]->pnum); 1328 goto out_kfree; 1329 } 1330 } 1331 1332 ubi_assert(new_fm); 1333 ubi->fm = new_fm; 1334 1335 ret = self_check_seen(ubi, seen_pebs); 1336 dbg_bld("fastmap written!"); 1337 1338 out_kfree: 1339 ubi_free_vid_buf(avbuf); 1340 ubi_free_vid_buf(dvbuf); 1341 free_seen(seen_pebs); 1342 out: 1343 return ret; 1344 } 1345 1346 /** 1347 * erase_block - Manually erase a PEB. 1348 * @ubi: UBI device object 1349 * @pnum: PEB to be erased 1350 * 1351 * Returns the new EC value on success, < 0 indicates an internal error. 1352 */ 1353 static int erase_block(struct ubi_device *ubi, int pnum) 1354 { 1355 int ret; 1356 struct ubi_ec_hdr *ec_hdr; 1357 long long ec; 1358 1359 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 1360 if (!ec_hdr) 1361 return -ENOMEM; 1362 1363 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0); 1364 if (ret < 0) 1365 goto out; 1366 else if (ret && ret != UBI_IO_BITFLIPS) { 1367 ret = -EINVAL; 1368 goto out; 1369 } 1370 1371 ret = ubi_io_sync_erase(ubi, pnum, 0); 1372 if (ret < 0) 1373 goto out; 1374 1375 ec = be64_to_cpu(ec_hdr->ec); 1376 ec += ret; 1377 if (ec > UBI_MAX_ERASECOUNTER) { 1378 ret = -EINVAL; 1379 goto out; 1380 } 1381 1382 ec_hdr->ec = cpu_to_be64(ec); 1383 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr); 1384 if (ret < 0) 1385 goto out; 1386 1387 ret = ec; 1388 out: 1389 kfree(ec_hdr); 1390 return ret; 1391 } 1392 1393 /** 1394 * invalidate_fastmap - destroys a fastmap. 1395 * @ubi: UBI device object 1396 * 1397 * This function ensures that upon next UBI attach a full scan 1398 * is issued. We need this if UBI is about to write a new fastmap 1399 * but is unable to do so. In this case we have two options: 1400 * a) Make sure that the current fastmap will not be usued upon 1401 * attach time and contine or b) fall back to RO mode to have the 1402 * current fastmap in a valid state. 1403 * Returns 0 on success, < 0 indicates an internal error. 1404 */ 1405 static int invalidate_fastmap(struct ubi_device *ubi) 1406 { 1407 int ret; 1408 struct ubi_fastmap_layout *fm; 1409 struct ubi_wl_entry *e; 1410 struct ubi_vid_io_buf *vb = NULL; 1411 struct ubi_vid_hdr *vh; 1412 1413 if (!ubi->fm) 1414 return 0; 1415 1416 ubi->fm = NULL; 1417 1418 ret = -ENOMEM; 1419 fm = kzalloc(sizeof(*fm), GFP_KERNEL); 1420 if (!fm) 1421 goto out; 1422 1423 vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1424 if (!vb) 1425 goto out_free_fm; 1426 1427 vh = ubi_get_vid_hdr(vb); 1428 1429 ret = -ENOSPC; 1430 e = ubi_wl_get_fm_peb(ubi, 1); 1431 if (!e) 1432 goto out_free_fm; 1433 1434 /* 1435 * Create fake fastmap such that UBI will fall back 1436 * to scanning mode. 1437 */ 1438 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1439 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb); 1440 if (ret < 0) { 1441 ubi_wl_put_fm_peb(ubi, e, 0, 0); 1442 goto out_free_fm; 1443 } 1444 1445 fm->used_blocks = 1; 1446 fm->e[0] = e; 1447 1448 ubi->fm = fm; 1449 1450 out: 1451 ubi_free_vid_buf(vb); 1452 return ret; 1453 1454 out_free_fm: 1455 kfree(fm); 1456 goto out; 1457 } 1458 1459 /** 1460 * return_fm_pebs - returns all PEBs used by a fastmap back to the 1461 * WL sub-system. 1462 * @ubi: UBI device object 1463 * @fm: fastmap layout object 1464 */ 1465 static void return_fm_pebs(struct ubi_device *ubi, 1466 struct ubi_fastmap_layout *fm) 1467 { 1468 int i; 1469 1470 if (!fm) 1471 return; 1472 1473 for (i = 0; i < fm->used_blocks; i++) { 1474 if (fm->e[i]) { 1475 ubi_wl_put_fm_peb(ubi, fm->e[i], i, 1476 fm->to_be_tortured[i]); 1477 fm->e[i] = NULL; 1478 } 1479 } 1480 } 1481 1482 /** 1483 * ubi_update_fastmap - will be called by UBI if a volume changes or 1484 * a fastmap pool becomes full. 1485 * @ubi: UBI device object 1486 * 1487 * Returns 0 on success, < 0 indicates an internal error. 1488 */ 1489 int ubi_update_fastmap(struct ubi_device *ubi) 1490 { 1491 int ret, i, j; 1492 struct ubi_fastmap_layout *new_fm, *old_fm; 1493 struct ubi_wl_entry *tmp_e; 1494 1495 down_write(&ubi->fm_protect); 1496 down_write(&ubi->work_sem); 1497 down_write(&ubi->fm_eba_sem); 1498 1499 ubi_refill_pools(ubi); 1500 1501 if (ubi->ro_mode || ubi->fm_disabled) { 1502 up_write(&ubi->fm_eba_sem); 1503 up_write(&ubi->work_sem); 1504 up_write(&ubi->fm_protect); 1505 return 0; 1506 } 1507 1508 ret = ubi_ensure_anchor_pebs(ubi); 1509 if (ret) { 1510 up_write(&ubi->fm_eba_sem); 1511 up_write(&ubi->work_sem); 1512 up_write(&ubi->fm_protect); 1513 return ret; 1514 } 1515 1516 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL); 1517 if (!new_fm) { 1518 up_write(&ubi->fm_eba_sem); 1519 up_write(&ubi->work_sem); 1520 up_write(&ubi->fm_protect); 1521 return -ENOMEM; 1522 } 1523 1524 new_fm->used_blocks = ubi->fm_size / ubi->leb_size; 1525 old_fm = ubi->fm; 1526 ubi->fm = NULL; 1527 1528 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) { 1529 ubi_err(ubi, "fastmap too large"); 1530 ret = -ENOSPC; 1531 goto err; 1532 } 1533 1534 for (i = 1; i < new_fm->used_blocks; i++) { 1535 spin_lock(&ubi->wl_lock); 1536 tmp_e = ubi_wl_get_fm_peb(ubi, 0); 1537 spin_unlock(&ubi->wl_lock); 1538 1539 if (!tmp_e) { 1540 if (old_fm && old_fm->e[i]) { 1541 ret = erase_block(ubi, old_fm->e[i]->pnum); 1542 if (ret < 0) { 1543 ubi_err(ubi, "could not erase old fastmap PEB"); 1544 1545 for (j = 1; j < i; j++) { 1546 ubi_wl_put_fm_peb(ubi, new_fm->e[j], 1547 j, 0); 1548 new_fm->e[j] = NULL; 1549 } 1550 goto err; 1551 } 1552 new_fm->e[i] = old_fm->e[i]; 1553 old_fm->e[i] = NULL; 1554 } else { 1555 ubi_err(ubi, "could not get any free erase block"); 1556 1557 for (j = 1; j < i; j++) { 1558 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0); 1559 new_fm->e[j] = NULL; 1560 } 1561 1562 ret = -ENOSPC; 1563 goto err; 1564 } 1565 } else { 1566 new_fm->e[i] = tmp_e; 1567 1568 if (old_fm && old_fm->e[i]) { 1569 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1570 old_fm->to_be_tortured[i]); 1571 old_fm->e[i] = NULL; 1572 } 1573 } 1574 } 1575 1576 /* Old fastmap is larger than the new one */ 1577 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) { 1578 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) { 1579 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1580 old_fm->to_be_tortured[i]); 1581 old_fm->e[i] = NULL; 1582 } 1583 } 1584 1585 spin_lock(&ubi->wl_lock); 1586 tmp_e = ubi_wl_get_fm_peb(ubi, 1); 1587 spin_unlock(&ubi->wl_lock); 1588 1589 if (old_fm) { 1590 /* no fresh anchor PEB was found, reuse the old one */ 1591 if (!tmp_e) { 1592 ret = erase_block(ubi, old_fm->e[0]->pnum); 1593 if (ret < 0) { 1594 ubi_err(ubi, "could not erase old anchor PEB"); 1595 1596 for (i = 1; i < new_fm->used_blocks; i++) { 1597 ubi_wl_put_fm_peb(ubi, new_fm->e[i], 1598 i, 0); 1599 new_fm->e[i] = NULL; 1600 } 1601 goto err; 1602 } 1603 new_fm->e[0] = old_fm->e[0]; 1604 new_fm->e[0]->ec = ret; 1605 old_fm->e[0] = NULL; 1606 } else { 1607 /* we've got a new anchor PEB, return the old one */ 1608 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0, 1609 old_fm->to_be_tortured[0]); 1610 new_fm->e[0] = tmp_e; 1611 old_fm->e[0] = NULL; 1612 } 1613 } else { 1614 if (!tmp_e) { 1615 ubi_err(ubi, "could not find any anchor PEB"); 1616 1617 for (i = 1; i < new_fm->used_blocks; i++) { 1618 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0); 1619 new_fm->e[i] = NULL; 1620 } 1621 1622 ret = -ENOSPC; 1623 goto err; 1624 } 1625 new_fm->e[0] = tmp_e; 1626 } 1627 1628 ret = ubi_write_fastmap(ubi, new_fm); 1629 1630 if (ret) 1631 goto err; 1632 1633 out_unlock: 1634 up_write(&ubi->fm_eba_sem); 1635 up_write(&ubi->work_sem); 1636 up_write(&ubi->fm_protect); 1637 kfree(old_fm); 1638 return ret; 1639 1640 err: 1641 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret); 1642 1643 ret = invalidate_fastmap(ubi); 1644 if (ret < 0) { 1645 ubi_err(ubi, "Unable to invalidiate current fastmap!"); 1646 ubi_ro_mode(ubi); 1647 } else { 1648 return_fm_pebs(ubi, old_fm); 1649 return_fm_pebs(ubi, new_fm); 1650 ret = 0; 1651 } 1652 1653 kfree(new_fm); 1654 goto out_unlock; 1655 } 1656