1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (c) 2012 Linutronix GmbH 4 * Copyright (c) 2014 sigma star gmbh 5 * Author: Richard Weinberger <richard@nod.at> 6 */ 7 8#include <linux/crc32.h> 9#include <linux/bitmap.h> 10#include "ubi.h" 11 12/** 13 * init_seen - allocate memory for used for debugging. 14 * @ubi: UBI device description object 15 */ 16static inline unsigned long *init_seen(struct ubi_device *ubi) 17{ 18 unsigned long *ret; 19 20 if (!ubi_dbg_chk_fastmap(ubi)) 21 return NULL; 22 23 ret = bitmap_zalloc(ubi->peb_count, GFP_NOFS); 24 if (!ret) 25 return ERR_PTR(-ENOMEM); 26 27 return ret; 28} 29 30/** 31 * free_seen - free the seen logic integer array. 32 * @seen: integer array of @ubi->peb_count size 33 */ 34static inline void free_seen(unsigned long *seen) 35{ 36 bitmap_free(seen); 37} 38 39/** 40 * set_seen - mark a PEB as seen. 41 * @ubi: UBI device description object 42 * @pnum: The PEB to be makred as seen 43 * @seen: integer array of @ubi->peb_count size 44 */ 45static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen) 46{ 47 if (!ubi_dbg_chk_fastmap(ubi) || !seen) 48 return; 49 50 set_bit(pnum, seen); 51} 52 53/** 54 * self_check_seen - check whether all PEB have been seen by fastmap. 55 * @ubi: UBI device description object 56 * @seen: integer array of @ubi->peb_count size 57 */ 58static int self_check_seen(struct ubi_device *ubi, unsigned long *seen) 59{ 60 int pnum, ret = 0; 61 62 if (!ubi_dbg_chk_fastmap(ubi) || !seen) 63 return 0; 64 65 for (pnum = 0; pnum < ubi->peb_count; pnum++) { 66 if (!test_bit(pnum, seen) && ubi->lookuptbl[pnum]) { 67 ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum); 68 ret = -EINVAL; 69 } 70 } 71 72 return ret; 73} 74 75/** 76 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device. 77 * @ubi: UBI device description object 78 */ 79size_t ubi_calc_fm_size(struct ubi_device *ubi) 80{ 81 size_t size; 82 83 size = sizeof(struct ubi_fm_sb) + 84 sizeof(struct ubi_fm_hdr) + 85 sizeof(struct ubi_fm_scan_pool) + 86 sizeof(struct ubi_fm_scan_pool) + 87 (ubi->peb_count * sizeof(struct ubi_fm_ec)) + 88 ((sizeof(struct ubi_fm_eba) + 89 sizeof(struct ubi_fm_volhdr)) * 90 (UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT)) + 91 (ubi->peb_count * sizeof(__be32)); 92 return roundup(size, ubi->leb_size); 93} 94 95 96/** 97 * new_fm_vbuf() - allocate a new volume header for fastmap usage. 98 * @ubi: UBI device description object 99 * @vol_id: the VID of the new header 100 * 101 * Returns a new struct ubi_vid_hdr on success. 102 * NULL indicates out of memory. 103 */ 104static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id) 105{ 106 struct ubi_vid_io_buf *new; 107 struct ubi_vid_hdr *vh; 108 109 new = ubi_alloc_vid_buf(ubi, GFP_NOFS); 110 if (!new) 111 goto out; 112 113 vh = ubi_get_vid_hdr(new); 114 vh->vol_type = UBI_VID_DYNAMIC; 115 vh->vol_id = cpu_to_be32(vol_id); 116 117 /* UBI implementations without fastmap support have to delete the 118 * fastmap. 119 */ 120 vh->compat = UBI_COMPAT_DELETE; 121 122out: 123 return new; 124} 125 126/** 127 * add_aeb - create and add a attach erase block to a given list. 128 * @ai: UBI attach info object 129 * @list: the target list 130 * @pnum: PEB number of the new attach erase block 131 * @ec: erease counter of the new LEB 132 * @scrub: scrub this PEB after attaching 133 * 134 * Returns 0 on success, < 0 indicates an internal error. 135 */ 136static int add_aeb(struct ubi_attach_info *ai, struct list_head *list, 137 int pnum, int ec, int scrub) 138{ 139 struct ubi_ainf_peb *aeb; 140 141 aeb = ubi_alloc_aeb(ai, pnum, ec); 142 if (!aeb) 143 return -ENOMEM; 144 145 aeb->lnum = -1; 146 aeb->scrub = scrub; 147 aeb->copy_flag = aeb->sqnum = 0; 148 149 ai->ec_sum += aeb->ec; 150 ai->ec_count++; 151 152 if (ai->max_ec < aeb->ec) 153 ai->max_ec = aeb->ec; 154 155 if (ai->min_ec > aeb->ec) 156 ai->min_ec = aeb->ec; 157 158 list_add_tail(&aeb->u.list, list); 159 160 return 0; 161} 162 163/** 164 * add_vol - create and add a new volume to ubi_attach_info. 165 * @ai: ubi_attach_info object 166 * @vol_id: VID of the new volume 167 * @used_ebs: number of used EBS 168 * @data_pad: data padding value of the new volume 169 * @vol_type: volume type 170 * @last_eb_bytes: number of bytes in the last LEB 171 * 172 * Returns the new struct ubi_ainf_volume on success. 173 * NULL indicates an error. 174 */ 175static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id, 176 int used_ebs, int data_pad, u8 vol_type, 177 int last_eb_bytes) 178{ 179 struct ubi_ainf_volume *av; 180 181 av = ubi_add_av(ai, vol_id); 182 if (IS_ERR(av)) 183 return av; 184 185 av->data_pad = data_pad; 186 av->last_data_size = last_eb_bytes; 187 av->compat = 0; 188 av->vol_type = vol_type; 189 if (av->vol_type == UBI_STATIC_VOLUME) 190 av->used_ebs = used_ebs; 191 192 dbg_bld("found volume (ID %i)", vol_id); 193 return av; 194} 195 196/** 197 * assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it 198 * from it's original list. 199 * @ai: ubi_attach_info object 200 * @aeb: the to be assigned SEB 201 * @av: target scan volume 202 */ 203static void assign_aeb_to_av(struct ubi_attach_info *ai, 204 struct ubi_ainf_peb *aeb, 205 struct ubi_ainf_volume *av) 206{ 207 struct ubi_ainf_peb *tmp_aeb; 208 struct rb_node **p = &av->root.rb_node, *parent = NULL; 209 210 while (*p) { 211 parent = *p; 212 213 tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); 214 if (aeb->lnum != tmp_aeb->lnum) { 215 if (aeb->lnum < tmp_aeb->lnum) 216 p = &(*p)->rb_left; 217 else 218 p = &(*p)->rb_right; 219 220 continue; 221 } else 222 break; 223 } 224 225 list_del(&aeb->u.list); 226 av->leb_count++; 227 228 rb_link_node(&aeb->u.rb, parent, p); 229 rb_insert_color(&aeb->u.rb, &av->root); 230} 231 232/** 233 * update_vol - inserts or updates a LEB which was found a pool. 234 * @ubi: the UBI device object 235 * @ai: attach info object 236 * @av: the volume this LEB belongs to 237 * @new_vh: the volume header derived from new_aeb 238 * @new_aeb: the AEB to be examined 239 * 240 * Returns 0 on success, < 0 indicates an internal error. 241 */ 242static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai, 243 struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh, 244 struct ubi_ainf_peb *new_aeb) 245{ 246 struct rb_node **p = &av->root.rb_node, *parent = NULL; 247 struct ubi_ainf_peb *aeb, *victim; 248 int cmp_res; 249 250 while (*p) { 251 parent = *p; 252 aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb); 253 254 if (be32_to_cpu(new_vh->lnum) != aeb->lnum) { 255 if (be32_to_cpu(new_vh->lnum) < aeb->lnum) 256 p = &(*p)->rb_left; 257 else 258 p = &(*p)->rb_right; 259 260 continue; 261 } 262 263 /* This case can happen if the fastmap gets written 264 * because of a volume change (creation, deletion, ..). 265 * Then a PEB can be within the persistent EBA and the pool. 266 */ 267 if (aeb->pnum == new_aeb->pnum) { 268 ubi_assert(aeb->lnum == new_aeb->lnum); 269 ubi_free_aeb(ai, new_aeb); 270 271 return 0; 272 } 273 274 cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh); 275 if (cmp_res < 0) 276 return cmp_res; 277 278 /* new_aeb is newer */ 279 if (cmp_res & 1) { 280 victim = ubi_alloc_aeb(ai, aeb->pnum, aeb->ec); 281 if (!victim) 282 return -ENOMEM; 283 284 list_add_tail(&victim->u.list, &ai->erase); 285 286 if (av->highest_lnum == be32_to_cpu(new_vh->lnum)) 287 av->last_data_size = 288 be32_to_cpu(new_vh->data_size); 289 290 dbg_bld("vol %i: AEB %i's PEB %i is the newer", 291 av->vol_id, aeb->lnum, new_aeb->pnum); 292 293 aeb->ec = new_aeb->ec; 294 aeb->pnum = new_aeb->pnum; 295 aeb->copy_flag = new_vh->copy_flag; 296 aeb->scrub = new_aeb->scrub; 297 aeb->sqnum = new_aeb->sqnum; 298 ubi_free_aeb(ai, new_aeb); 299 300 /* new_aeb is older */ 301 } else { 302 dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it", 303 av->vol_id, aeb->lnum, new_aeb->pnum); 304 list_add_tail(&new_aeb->u.list, &ai->erase); 305 } 306 307 return 0; 308 } 309 /* This LEB is new, let's add it to the volume */ 310 311 if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) { 312 av->highest_lnum = be32_to_cpu(new_vh->lnum); 313 av->last_data_size = be32_to_cpu(new_vh->data_size); 314 } 315 316 if (av->vol_type == UBI_STATIC_VOLUME) 317 av->used_ebs = be32_to_cpu(new_vh->used_ebs); 318 319 av->leb_count++; 320 321 rb_link_node(&new_aeb->u.rb, parent, p); 322 rb_insert_color(&new_aeb->u.rb, &av->root); 323 324 return 0; 325} 326 327/** 328 * process_pool_aeb - we found a non-empty PEB in a pool. 329 * @ubi: UBI device object 330 * @ai: attach info object 331 * @new_vh: the volume header derived from new_aeb 332 * @new_aeb: the AEB to be examined 333 * 334 * Returns 0 on success, < 0 indicates an internal error. 335 */ 336static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai, 337 struct ubi_vid_hdr *new_vh, 338 struct ubi_ainf_peb *new_aeb) 339{ 340 int vol_id = be32_to_cpu(new_vh->vol_id); 341 struct ubi_ainf_volume *av; 342 343 if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) { 344 ubi_free_aeb(ai, new_aeb); 345 346 return 0; 347 } 348 349 /* Find the volume this SEB belongs to */ 350 av = ubi_find_av(ai, vol_id); 351 if (!av) { 352 ubi_err(ubi, "orphaned volume in fastmap pool!"); 353 ubi_free_aeb(ai, new_aeb); 354 return UBI_BAD_FASTMAP; 355 } 356 357 ubi_assert(vol_id == av->vol_id); 358 359 return update_vol(ubi, ai, av, new_vh, new_aeb); 360} 361 362/** 363 * unmap_peb - unmap a PEB. 364 * If fastmap detects a free PEB in the pool it has to check whether 365 * this PEB has been unmapped after writing the fastmap. 366 * 367 * @ai: UBI attach info object 368 * @pnum: The PEB to be unmapped 369 */ 370static void unmap_peb(struct ubi_attach_info *ai, int pnum) 371{ 372 struct ubi_ainf_volume *av; 373 struct rb_node *node, *node2; 374 struct ubi_ainf_peb *aeb; 375 376 ubi_rb_for_each_entry(node, av, &ai->volumes, rb) { 377 ubi_rb_for_each_entry(node2, aeb, &av->root, u.rb) { 378 if (aeb->pnum == pnum) { 379 rb_erase(&aeb->u.rb, &av->root); 380 av->leb_count--; 381 ubi_free_aeb(ai, aeb); 382 return; 383 } 384 } 385 } 386} 387 388/** 389 * scan_pool - scans a pool for changed (no longer empty PEBs). 390 * @ubi: UBI device object 391 * @ai: attach info object 392 * @pebs: an array of all PEB numbers in the to be scanned pool 393 * @pool_size: size of the pool (number of entries in @pebs) 394 * @max_sqnum: pointer to the maximal sequence number 395 * @free: list of PEBs which are most likely free (and go into @ai->free) 396 * 397 * Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned. 398 * < 0 indicates an internal error. 399 */ 400static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai, 401 __be32 *pebs, int pool_size, unsigned long long *max_sqnum, 402 struct list_head *free) 403{ 404 struct ubi_vid_io_buf *vb; 405 struct ubi_vid_hdr *vh; 406 struct ubi_ec_hdr *ech; 407 struct ubi_ainf_peb *new_aeb; 408 int i, pnum, err, ret = 0; 409 410 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 411 if (!ech) 412 return -ENOMEM; 413 414 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL); 415 if (!vb) { 416 kfree(ech); 417 return -ENOMEM; 418 } 419 420 vh = ubi_get_vid_hdr(vb); 421 422 dbg_bld("scanning fastmap pool: size = %i", pool_size); 423 424 /* 425 * Now scan all PEBs in the pool to find changes which have been made 426 * after the creation of the fastmap 427 */ 428 for (i = 0; i < pool_size; i++) { 429 int scrub = 0; 430 int image_seq; 431 432 pnum = be32_to_cpu(pebs[i]); 433 434 if (ubi_io_is_bad(ubi, pnum)) { 435 ubi_err(ubi, "bad PEB in fastmap pool!"); 436 ret = UBI_BAD_FASTMAP; 437 goto out; 438 } 439 440 err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); 441 if (err && err != UBI_IO_BITFLIPS) { 442 ubi_err(ubi, "unable to read EC header! PEB:%i err:%i", 443 pnum, err); 444 ret = err > 0 ? UBI_BAD_FASTMAP : err; 445 goto out; 446 } else if (err == UBI_IO_BITFLIPS) 447 scrub = 1; 448 449 /* 450 * Older UBI implementations have image_seq set to zero, so 451 * we shouldn't fail if image_seq == 0. 452 */ 453 image_seq = be32_to_cpu(ech->image_seq); 454 455 if (image_seq && (image_seq != ubi->image_seq)) { 456 ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x", 457 be32_to_cpu(ech->image_seq), ubi->image_seq); 458 ret = UBI_BAD_FASTMAP; 459 goto out; 460 } 461 462 err = ubi_io_read_vid_hdr(ubi, pnum, vb, 0); 463 if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) { 464 unsigned long long ec = be64_to_cpu(ech->ec); 465 unmap_peb(ai, pnum); 466 dbg_bld("Adding PEB to free: %i", pnum); 467 468 if (err == UBI_IO_FF_BITFLIPS) 469 scrub = 1; 470 471 ret = add_aeb(ai, free, pnum, ec, scrub); 472 if (ret) 473 goto out; 474 continue; 475 } else if (err == 0 || err == UBI_IO_BITFLIPS) { 476 dbg_bld("Found non empty PEB:%i in pool", pnum); 477 478 if (err == UBI_IO_BITFLIPS) 479 scrub = 1; 480 481 new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec)); 482 if (!new_aeb) { 483 ret = -ENOMEM; 484 goto out; 485 } 486 487 new_aeb->lnum = be32_to_cpu(vh->lnum); 488 new_aeb->sqnum = be64_to_cpu(vh->sqnum); 489 new_aeb->copy_flag = vh->copy_flag; 490 new_aeb->scrub = scrub; 491 492 if (*max_sqnum < new_aeb->sqnum) 493 *max_sqnum = new_aeb->sqnum; 494 495 err = process_pool_aeb(ubi, ai, vh, new_aeb); 496 if (err) { 497 ret = err > 0 ? UBI_BAD_FASTMAP : err; 498 goto out; 499 } 500 } else { 501 /* We are paranoid and fall back to scanning mode */ 502 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!"); 503 ret = err > 0 ? UBI_BAD_FASTMAP : err; 504 goto out; 505 } 506 507 } 508 509out: 510 ubi_free_vid_buf(vb); 511 kfree(ech); 512 return ret; 513} 514 515/** 516 * count_fastmap_pebs - Counts the PEBs found by fastmap. 517 * @ai: The UBI attach info object 518 */ 519static int count_fastmap_pebs(struct ubi_attach_info *ai) 520{ 521 struct ubi_ainf_peb *aeb; 522 struct ubi_ainf_volume *av; 523 struct rb_node *rb1, *rb2; 524 int n = 0; 525 526 list_for_each_entry(aeb, &ai->erase, u.list) 527 n++; 528 529 list_for_each_entry(aeb, &ai->free, u.list) 530 n++; 531 532 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) 533 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) 534 n++; 535 536 return n; 537} 538 539/** 540 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap. 541 * @ubi: UBI device object 542 * @ai: UBI attach info object 543 * @fm: the fastmap to be attached 544 * 545 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable. 546 * < 0 indicates an internal error. 547 */ 548static int ubi_attach_fastmap(struct ubi_device *ubi, 549 struct ubi_attach_info *ai, 550 struct ubi_fastmap_layout *fm) 551{ 552 struct list_head used, free; 553 struct ubi_ainf_volume *av; 554 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb; 555 struct ubi_fm_sb *fmsb; 556 struct ubi_fm_hdr *fmhdr; 557 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 558 struct ubi_fm_ec *fmec; 559 struct ubi_fm_volhdr *fmvhdr; 560 struct ubi_fm_eba *fm_eba; 561 int ret, i, j, pool_size, wl_pool_size; 562 size_t fm_pos = 0, fm_size = ubi->fm_size; 563 unsigned long long max_sqnum = 0; 564 void *fm_raw = ubi->fm_buf; 565 566 INIT_LIST_HEAD(&used); 567 INIT_LIST_HEAD(&free); 568 ai->min_ec = UBI_MAX_ERASECOUNTER; 569 570 fmsb = (struct ubi_fm_sb *)(fm_raw); 571 ai->max_sqnum = fmsb->sqnum; 572 fm_pos += sizeof(struct ubi_fm_sb); 573 if (fm_pos >= fm_size) 574 goto fail_bad; 575 576 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 577 fm_pos += sizeof(*fmhdr); 578 if (fm_pos >= fm_size) 579 goto fail_bad; 580 581 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) { 582 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x", 583 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC); 584 goto fail_bad; 585 } 586 587 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 588 fm_pos += sizeof(*fmpl); 589 if (fm_pos >= fm_size) 590 goto fail_bad; 591 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) { 592 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x", 593 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC); 594 goto fail_bad; 595 } 596 597 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 598 fm_pos += sizeof(*fmpl_wl); 599 if (fm_pos >= fm_size) 600 goto fail_bad; 601 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) { 602 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x", 603 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC); 604 goto fail_bad; 605 } 606 607 pool_size = be16_to_cpu(fmpl->size); 608 wl_pool_size = be16_to_cpu(fmpl_wl->size); 609 fm->max_pool_size = be16_to_cpu(fmpl->max_size); 610 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size); 611 612 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) { 613 ubi_err(ubi, "bad pool size: %i", pool_size); 614 goto fail_bad; 615 } 616 617 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) { 618 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size); 619 goto fail_bad; 620 } 621 622 623 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE || 624 fm->max_pool_size < 0) { 625 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size); 626 goto fail_bad; 627 } 628 629 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE || 630 fm->max_wl_pool_size < 0) { 631 ubi_err(ubi, "bad maximal WL pool size: %i", 632 fm->max_wl_pool_size); 633 goto fail_bad; 634 } 635 636 /* read EC values from free list */ 637 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) { 638 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 639 fm_pos += sizeof(*fmec); 640 if (fm_pos >= fm_size) 641 goto fail_bad; 642 643 ret = add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum), 644 be32_to_cpu(fmec->ec), 0); 645 if (ret) 646 goto fail; 647 } 648 649 /* read EC values from used list */ 650 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) { 651 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 652 fm_pos += sizeof(*fmec); 653 if (fm_pos >= fm_size) 654 goto fail_bad; 655 656 ret = add_aeb(ai, &used, be32_to_cpu(fmec->pnum), 657 be32_to_cpu(fmec->ec), 0); 658 if (ret) 659 goto fail; 660 } 661 662 /* read EC values from scrub list */ 663 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) { 664 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 665 fm_pos += sizeof(*fmec); 666 if (fm_pos >= fm_size) 667 goto fail_bad; 668 669 ret = add_aeb(ai, &used, be32_to_cpu(fmec->pnum), 670 be32_to_cpu(fmec->ec), 1); 671 if (ret) 672 goto fail; 673 } 674 675 /* read EC values from erase list */ 676 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) { 677 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 678 fm_pos += sizeof(*fmec); 679 if (fm_pos >= fm_size) 680 goto fail_bad; 681 682 ret = add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum), 683 be32_to_cpu(fmec->ec), 1); 684 if (ret) 685 goto fail; 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 796fail_bad: 797 ret = UBI_BAD_FASTMAP; 798fail: 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 */ 815static 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 831static struct ubi_ainf_peb *clone_aeb(struct ubi_attach_info *ai, 832 struct ubi_ainf_peb *old) 833{ 834 struct ubi_ainf_peb *new; 835 836 new = ubi_alloc_aeb(ai, old->pnum, old->ec); 837 if (!new) 838 return NULL; 839 840 new->vol_id = old->vol_id; 841 new->sqnum = old->sqnum; 842 new->lnum = old->lnum; 843 new->scrub = old->scrub; 844 new->copy_flag = old->copy_flag; 845 846 return new; 847} 848 849/** 850 * ubi_scan_fastmap - scan the fastmap. 851 * @ubi: UBI device object 852 * @ai: UBI attach info to be filled 853 * @scan_ai: UBI attach info from the first 64 PEBs, 854 * used to find the most recent Fastmap data structure 855 * 856 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found, 857 * UBI_BAD_FASTMAP if one was found but is not usable. 858 * < 0 indicates an internal error. 859 */ 860int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, 861 struct ubi_attach_info *scan_ai) 862{ 863 struct ubi_fm_sb *fmsb, *fmsb2; 864 struct ubi_vid_io_buf *vb; 865 struct ubi_vid_hdr *vh; 866 struct ubi_ec_hdr *ech; 867 struct ubi_fastmap_layout *fm; 868 struct ubi_ainf_peb *aeb; 869 int i, used_blocks, pnum, fm_anchor, ret = 0; 870 size_t fm_size; 871 __be32 crc, tmp_crc; 872 unsigned long long sqnum = 0; 873 874 fm_anchor = find_fm_anchor(scan_ai); 875 if (fm_anchor < 0) 876 return UBI_NO_FASTMAP; 877 878 /* Copy all (possible) fastmap blocks into our new attach structure. */ 879 list_for_each_entry(aeb, &scan_ai->fastmap, u.list) { 880 struct ubi_ainf_peb *new; 881 882 new = clone_aeb(ai, aeb); 883 if (!new) 884 return -ENOMEM; 885 886 list_add(&new->u.list, &ai->fastmap); 887 } 888 889 down_write(&ubi->fm_protect); 890 memset(ubi->fm_buf, 0, ubi->fm_size); 891 892 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL); 893 if (!fmsb) { 894 ret = -ENOMEM; 895 goto out; 896 } 897 898 fm = kzalloc(sizeof(*fm), GFP_KERNEL); 899 if (!fm) { 900 ret = -ENOMEM; 901 kfree(fmsb); 902 goto out; 903 } 904 905 ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb)); 906 if (ret && ret != UBI_IO_BITFLIPS) 907 goto free_fm_sb; 908 else if (ret == UBI_IO_BITFLIPS) 909 fm->to_be_tortured[0] = 1; 910 911 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) { 912 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x", 913 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC); 914 ret = UBI_BAD_FASTMAP; 915 goto free_fm_sb; 916 } 917 918 if (fmsb->version != UBI_FM_FMT_VERSION) { 919 ubi_err(ubi, "bad fastmap version: %i, expected: %i", 920 fmsb->version, UBI_FM_FMT_VERSION); 921 ret = UBI_BAD_FASTMAP; 922 goto free_fm_sb; 923 } 924 925 used_blocks = be32_to_cpu(fmsb->used_blocks); 926 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) { 927 ubi_err(ubi, "number of fastmap blocks is invalid: %i", 928 used_blocks); 929 ret = UBI_BAD_FASTMAP; 930 goto free_fm_sb; 931 } 932 933 fm_size = ubi->leb_size * used_blocks; 934 if (fm_size != ubi->fm_size) { 935 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi", 936 fm_size, ubi->fm_size); 937 ret = UBI_BAD_FASTMAP; 938 goto free_fm_sb; 939 } 940 941 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 942 if (!ech) { 943 ret = -ENOMEM; 944 goto free_fm_sb; 945 } 946 947 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL); 948 if (!vb) { 949 ret = -ENOMEM; 950 goto free_hdr; 951 } 952 953 vh = ubi_get_vid_hdr(vb); 954 955 for (i = 0; i < used_blocks; i++) { 956 int image_seq; 957 958 pnum = be32_to_cpu(fmsb->block_loc[i]); 959 960 if (ubi_io_is_bad(ubi, pnum)) { 961 ret = UBI_BAD_FASTMAP; 962 goto free_hdr; 963 } 964 965 if (i == 0 && pnum != fm_anchor) { 966 ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i", 967 pnum, fm_anchor); 968 ret = UBI_BAD_FASTMAP; 969 goto free_hdr; 970 } 971 972 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); 973 if (ret && ret != UBI_IO_BITFLIPS) { 974 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)", 975 i, pnum); 976 if (ret > 0) 977 ret = UBI_BAD_FASTMAP; 978 goto free_hdr; 979 } else if (ret == UBI_IO_BITFLIPS) 980 fm->to_be_tortured[i] = 1; 981 982 image_seq = be32_to_cpu(ech->image_seq); 983 if (!ubi->image_seq) 984 ubi->image_seq = image_seq; 985 986 /* 987 * Older UBI implementations have image_seq set to zero, so 988 * we shouldn't fail if image_seq == 0. 989 */ 990 if (image_seq && (image_seq != ubi->image_seq)) { 991 ubi_err(ubi, "wrong image seq:%d instead of %d", 992 be32_to_cpu(ech->image_seq), ubi->image_seq); 993 ret = UBI_BAD_FASTMAP; 994 goto free_hdr; 995 } 996 997 ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0); 998 if (ret && ret != UBI_IO_BITFLIPS) { 999 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)", 1000 i, pnum); 1001 goto free_hdr; 1002 } 1003 1004 if (i == 0) { 1005 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) { 1006 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x", 1007 be32_to_cpu(vh->vol_id), 1008 UBI_FM_SB_VOLUME_ID); 1009 ret = UBI_BAD_FASTMAP; 1010 goto free_hdr; 1011 } 1012 } else { 1013 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) { 1014 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x", 1015 be32_to_cpu(vh->vol_id), 1016 UBI_FM_DATA_VOLUME_ID); 1017 ret = UBI_BAD_FASTMAP; 1018 goto free_hdr; 1019 } 1020 } 1021 1022 if (sqnum < be64_to_cpu(vh->sqnum)) 1023 sqnum = be64_to_cpu(vh->sqnum); 1024 1025 ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i), 1026 pnum, 0, ubi->leb_size); 1027 if (ret && ret != UBI_IO_BITFLIPS) { 1028 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, " 1029 "err: %i)", i, pnum, ret); 1030 goto free_hdr; 1031 } 1032 } 1033 1034 kfree(fmsb); 1035 fmsb = NULL; 1036 1037 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf); 1038 tmp_crc = be32_to_cpu(fmsb2->data_crc); 1039 fmsb2->data_crc = 0; 1040 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size); 1041 if (crc != tmp_crc) { 1042 ubi_err(ubi, "fastmap data CRC is invalid"); 1043 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x", 1044 tmp_crc, crc); 1045 ret = UBI_BAD_FASTMAP; 1046 goto free_hdr; 1047 } 1048 1049 fmsb2->sqnum = sqnum; 1050 1051 fm->used_blocks = used_blocks; 1052 1053 ret = ubi_attach_fastmap(ubi, ai, fm); 1054 if (ret) { 1055 if (ret > 0) 1056 ret = UBI_BAD_FASTMAP; 1057 goto free_hdr; 1058 } 1059 1060 for (i = 0; i < used_blocks; i++) { 1061 struct ubi_wl_entry *e; 1062 1063 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL); 1064 if (!e) { 1065 while (i--) 1066 kmem_cache_free(ubi_wl_entry_slab, fm->e[i]); 1067 1068 ret = -ENOMEM; 1069 goto free_hdr; 1070 } 1071 1072 e->pnum = be32_to_cpu(fmsb2->block_loc[i]); 1073 e->ec = be32_to_cpu(fmsb2->block_ec[i]); 1074 fm->e[i] = e; 1075 } 1076 1077 ubi->fm = fm; 1078 ubi->fm_pool.max_size = ubi->fm->max_pool_size; 1079 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size; 1080 ubi_msg(ubi, "attached by fastmap"); 1081 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size); 1082 ubi_msg(ubi, "fastmap WL pool size: %d", 1083 ubi->fm_wl_pool.max_size); 1084 ubi->fm_disabled = 0; 1085 ubi->fast_attach = 1; 1086 1087 ubi_free_vid_buf(vb); 1088 kfree(ech); 1089out: 1090 up_write(&ubi->fm_protect); 1091 if (ret == UBI_BAD_FASTMAP) 1092 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!"); 1093 return ret; 1094 1095free_hdr: 1096 ubi_free_vid_buf(vb); 1097 kfree(ech); 1098free_fm_sb: 1099 kfree(fmsb); 1100 kfree(fm); 1101 goto out; 1102} 1103 1104int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count) 1105{ 1106 struct ubi_device *ubi = vol->ubi; 1107 1108 if (!ubi->fast_attach) 1109 return 0; 1110 1111 vol->checkmap = bitmap_zalloc(leb_count, GFP_KERNEL); 1112 if (!vol->checkmap) 1113 return -ENOMEM; 1114 1115 return 0; 1116} 1117 1118void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) 1119{ 1120 bitmap_free(vol->checkmap); 1121} 1122 1123/** 1124 * ubi_write_fastmap - writes a fastmap. 1125 * @ubi: UBI device object 1126 * @new_fm: the to be written fastmap 1127 * 1128 * Returns 0 on success, < 0 indicates an internal error. 1129 */ 1130static int ubi_write_fastmap(struct ubi_device *ubi, 1131 struct ubi_fastmap_layout *new_fm) 1132{ 1133 size_t fm_pos = 0; 1134 void *fm_raw; 1135 struct ubi_fm_sb *fmsb; 1136 struct ubi_fm_hdr *fmh; 1137 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 1138 struct ubi_fm_ec *fec; 1139 struct ubi_fm_volhdr *fvh; 1140 struct ubi_fm_eba *feba; 1141 struct ubi_wl_entry *wl_e; 1142 struct ubi_volume *vol; 1143 struct ubi_vid_io_buf *avbuf, *dvbuf; 1144 struct ubi_vid_hdr *avhdr, *dvhdr; 1145 struct ubi_work *ubi_wrk; 1146 struct rb_node *tmp_rb; 1147 int ret, i, j, free_peb_count, used_peb_count, vol_count; 1148 int scrub_peb_count, erase_peb_count; 1149 unsigned long *seen_pebs; 1150 1151 fm_raw = ubi->fm_buf; 1152 memset(ubi->fm_buf, 0, ubi->fm_size); 1153 1154 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1155 if (!avbuf) { 1156 ret = -ENOMEM; 1157 goto out; 1158 } 1159 1160 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID); 1161 if (!dvbuf) { 1162 ret = -ENOMEM; 1163 goto out_free_avbuf; 1164 } 1165 1166 avhdr = ubi_get_vid_hdr(avbuf); 1167 dvhdr = ubi_get_vid_hdr(dvbuf); 1168 1169 seen_pebs = init_seen(ubi); 1170 if (IS_ERR(seen_pebs)) { 1171 ret = PTR_ERR(seen_pebs); 1172 goto out_free_dvbuf; 1173 } 1174 1175 spin_lock(&ubi->volumes_lock); 1176 spin_lock(&ubi->wl_lock); 1177 1178 fmsb = (struct ubi_fm_sb *)fm_raw; 1179 fm_pos += sizeof(*fmsb); 1180 ubi_assert(fm_pos <= ubi->fm_size); 1181 1182 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 1183 fm_pos += sizeof(*fmh); 1184 ubi_assert(fm_pos <= ubi->fm_size); 1185 1186 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC); 1187 fmsb->version = UBI_FM_FMT_VERSION; 1188 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks); 1189 /* the max sqnum will be filled in while *reading* the fastmap */ 1190 fmsb->sqnum = 0; 1191 1192 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC); 1193 free_peb_count = 0; 1194 used_peb_count = 0; 1195 scrub_peb_count = 0; 1196 erase_peb_count = 0; 1197 vol_count = 0; 1198 1199 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1200 fm_pos += sizeof(*fmpl); 1201 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1202 fmpl->size = cpu_to_be16(ubi->fm_pool.size); 1203 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size); 1204 1205 for (i = 0; i < ubi->fm_pool.size; i++) { 1206 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]); 1207 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs); 1208 } 1209 1210 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1211 fm_pos += sizeof(*fmpl_wl); 1212 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1213 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size); 1214 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size); 1215 1216 for (i = 0; i < ubi->fm_wl_pool.size; i++) { 1217 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]); 1218 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs); 1219 } 1220 1221 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) { 1222 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1223 1224 fec->pnum = cpu_to_be32(wl_e->pnum); 1225 set_seen(ubi, wl_e->pnum, seen_pebs); 1226 fec->ec = cpu_to_be32(wl_e->ec); 1227 1228 free_peb_count++; 1229 fm_pos += sizeof(*fec); 1230 ubi_assert(fm_pos <= ubi->fm_size); 1231 } 1232 fmh->free_peb_count = cpu_to_be32(free_peb_count); 1233 1234 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) { 1235 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1236 1237 fec->pnum = cpu_to_be32(wl_e->pnum); 1238 set_seen(ubi, wl_e->pnum, seen_pebs); 1239 fec->ec = cpu_to_be32(wl_e->ec); 1240 1241 used_peb_count++; 1242 fm_pos += sizeof(*fec); 1243 ubi_assert(fm_pos <= ubi->fm_size); 1244 } 1245 1246 ubi_for_each_protected_peb(ubi, i, wl_e) { 1247 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1248 1249 fec->pnum = cpu_to_be32(wl_e->pnum); 1250 set_seen(ubi, wl_e->pnum, seen_pebs); 1251 fec->ec = cpu_to_be32(wl_e->ec); 1252 1253 used_peb_count++; 1254 fm_pos += sizeof(*fec); 1255 ubi_assert(fm_pos <= ubi->fm_size); 1256 } 1257 fmh->used_peb_count = cpu_to_be32(used_peb_count); 1258 1259 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) { 1260 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1261 1262 fec->pnum = cpu_to_be32(wl_e->pnum); 1263 set_seen(ubi, wl_e->pnum, seen_pebs); 1264 fec->ec = cpu_to_be32(wl_e->ec); 1265 1266 scrub_peb_count++; 1267 fm_pos += sizeof(*fec); 1268 ubi_assert(fm_pos <= ubi->fm_size); 1269 } 1270 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count); 1271 1272 1273 list_for_each_entry(ubi_wrk, &ubi->works, list) { 1274 if (ubi_is_erase_work(ubi_wrk)) { 1275 wl_e = ubi_wrk->e; 1276 ubi_assert(wl_e); 1277 1278 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1279 1280 fec->pnum = cpu_to_be32(wl_e->pnum); 1281 set_seen(ubi, wl_e->pnum, seen_pebs); 1282 fec->ec = cpu_to_be32(wl_e->ec); 1283 1284 erase_peb_count++; 1285 fm_pos += sizeof(*fec); 1286 ubi_assert(fm_pos <= ubi->fm_size); 1287 } 1288 } 1289 fmh->erase_peb_count = cpu_to_be32(erase_peb_count); 1290 1291 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) { 1292 vol = ubi->volumes[i]; 1293 1294 if (!vol) 1295 continue; 1296 1297 vol_count++; 1298 1299 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); 1300 fm_pos += sizeof(*fvh); 1301 ubi_assert(fm_pos <= ubi->fm_size); 1302 1303 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC); 1304 fvh->vol_id = cpu_to_be32(vol->vol_id); 1305 fvh->vol_type = vol->vol_type; 1306 fvh->used_ebs = cpu_to_be32(vol->used_ebs); 1307 fvh->data_pad = cpu_to_be32(vol->data_pad); 1308 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes); 1309 1310 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME || 1311 vol->vol_type == UBI_STATIC_VOLUME); 1312 1313 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos); 1314 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs); 1315 ubi_assert(fm_pos <= ubi->fm_size); 1316 1317 for (j = 0; j < vol->reserved_pebs; j++) { 1318 struct ubi_eba_leb_desc ldesc; 1319 1320 ubi_eba_get_ldesc(vol, j, &ldesc); 1321 feba->pnum[j] = cpu_to_be32(ldesc.pnum); 1322 } 1323 1324 feba->reserved_pebs = cpu_to_be32(j); 1325 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC); 1326 } 1327 fmh->vol_count = cpu_to_be32(vol_count); 1328 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count); 1329 1330 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1331 avhdr->lnum = 0; 1332 1333 spin_unlock(&ubi->wl_lock); 1334 spin_unlock(&ubi->volumes_lock); 1335 1336 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum); 1337 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf); 1338 if (ret) { 1339 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!"); 1340 goto out_free_seen; 1341 } 1342 1343 for (i = 0; i < new_fm->used_blocks; i++) { 1344 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum); 1345 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs); 1346 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec); 1347 } 1348 1349 fmsb->data_crc = 0; 1350 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw, 1351 ubi->fm_size)); 1352 1353 for (i = 1; i < new_fm->used_blocks; i++) { 1354 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1355 dvhdr->lnum = cpu_to_be32(i); 1356 dbg_bld("writing fastmap data to PEB %i sqnum %llu", 1357 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum)); 1358 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf); 1359 if (ret) { 1360 ubi_err(ubi, "unable to write vid_hdr to PEB %i!", 1361 new_fm->e[i]->pnum); 1362 goto out_free_seen; 1363 } 1364 } 1365 1366 for (i = 0; i < new_fm->used_blocks; i++) { 1367 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size), 1368 new_fm->e[i]->pnum, 0, ubi->leb_size); 1369 if (ret) { 1370 ubi_err(ubi, "unable to write fastmap to PEB %i!", 1371 new_fm->e[i]->pnum); 1372 goto out_free_seen; 1373 } 1374 } 1375 1376 ubi_assert(new_fm); 1377 ubi->fm = new_fm; 1378 1379 ret = self_check_seen(ubi, seen_pebs); 1380 dbg_bld("fastmap written!"); 1381 1382out_free_seen: 1383 free_seen(seen_pebs); 1384out_free_dvbuf: 1385 ubi_free_vid_buf(dvbuf); 1386out_free_avbuf: 1387 ubi_free_vid_buf(avbuf); 1388 1389out: 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 */ 1405static 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_NOFS); 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 1450out: 1451 ubi_free_vid_buf(vb); 1452 return ret; 1453 1454out_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 */ 1465static 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 */ 1489int 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 ubi_refill_pools_and_lock(ubi); 1496 1497 if (ubi->ro_mode || ubi->fm_disabled) { 1498 up_write(&ubi->fm_eba_sem); 1499 up_write(&ubi->work_sem); 1500 up_write(&ubi->fm_protect); 1501 return 0; 1502 } 1503 1504 new_fm = kzalloc(sizeof(*new_fm), GFP_NOFS); 1505 if (!new_fm) { 1506 up_write(&ubi->fm_eba_sem); 1507 up_write(&ubi->work_sem); 1508 up_write(&ubi->fm_protect); 1509 return -ENOMEM; 1510 } 1511 1512 new_fm->used_blocks = ubi->fm_size / ubi->leb_size; 1513 old_fm = ubi->fm; 1514 ubi->fm = NULL; 1515 1516 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) { 1517 ubi_err(ubi, "fastmap too large"); 1518 ret = -ENOSPC; 1519 goto err; 1520 } 1521 1522 for (i = 1; i < new_fm->used_blocks; i++) { 1523 spin_lock(&ubi->wl_lock); 1524 tmp_e = ubi_wl_get_fm_peb(ubi, 0); 1525 spin_unlock(&ubi->wl_lock); 1526 1527 if (!tmp_e) { 1528 if (old_fm && old_fm->e[i]) { 1529 ret = ubi_sync_erase(ubi, old_fm->e[i], 0); 1530 if (ret < 0) { 1531 ubi_err(ubi, "could not erase old fastmap PEB"); 1532 1533 for (j = 1; j < i; j++) { 1534 ubi_wl_put_fm_peb(ubi, new_fm->e[j], 1535 j, 0); 1536 new_fm->e[j] = NULL; 1537 } 1538 goto err; 1539 } 1540 new_fm->e[i] = old_fm->e[i]; 1541 old_fm->e[i] = NULL; 1542 } else { 1543 ubi_err(ubi, "could not get any free erase block"); 1544 1545 for (j = 1; j < i; j++) { 1546 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0); 1547 new_fm->e[j] = NULL; 1548 } 1549 1550 ret = -ENOSPC; 1551 goto err; 1552 } 1553 } else { 1554 new_fm->e[i] = tmp_e; 1555 1556 if (old_fm && old_fm->e[i]) { 1557 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1558 old_fm->to_be_tortured[i]); 1559 old_fm->e[i] = NULL; 1560 } 1561 } 1562 } 1563 1564 /* Old fastmap is larger than the new one */ 1565 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) { 1566 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) { 1567 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1568 old_fm->to_be_tortured[i]); 1569 old_fm->e[i] = NULL; 1570 } 1571 } 1572 1573 spin_lock(&ubi->wl_lock); 1574 tmp_e = ubi->fm_anchor; 1575 ubi->fm_anchor = NULL; 1576 spin_unlock(&ubi->wl_lock); 1577 1578 if (old_fm) { 1579 /* no fresh anchor PEB was found, reuse the old one */ 1580 if (!tmp_e) { 1581 ret = ubi_sync_erase(ubi, old_fm->e[0], 0); 1582 if (ret < 0) { 1583 ubi_err(ubi, "could not erase old anchor PEB"); 1584 1585 for (i = 1; i < new_fm->used_blocks; i++) { 1586 ubi_wl_put_fm_peb(ubi, new_fm->e[i], 1587 i, 0); 1588 new_fm->e[i] = NULL; 1589 } 1590 goto err; 1591 } 1592 new_fm->e[0] = old_fm->e[0]; 1593 old_fm->e[0] = NULL; 1594 } else { 1595 /* we've got a new anchor PEB, return the old one */ 1596 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0, 1597 old_fm->to_be_tortured[0]); 1598 new_fm->e[0] = tmp_e; 1599 old_fm->e[0] = NULL; 1600 } 1601 } else { 1602 if (!tmp_e) { 1603 ubi_err(ubi, "could not find any anchor PEB"); 1604 1605 for (i = 1; i < new_fm->used_blocks; i++) { 1606 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0); 1607 new_fm->e[i] = NULL; 1608 } 1609 1610 ret = -ENOSPC; 1611 goto err; 1612 } 1613 new_fm->e[0] = tmp_e; 1614 } 1615 1616 ret = ubi_write_fastmap(ubi, new_fm); 1617 1618 if (ret) 1619 goto err; 1620 1621out_unlock: 1622 up_write(&ubi->fm_eba_sem); 1623 up_write(&ubi->work_sem); 1624 up_write(&ubi->fm_protect); 1625 kfree(old_fm); 1626 1627 ubi_ensure_anchor_pebs(ubi); 1628 1629 return ret; 1630 1631err: 1632 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret); 1633 1634 ret = invalidate_fastmap(ubi); 1635 if (ret < 0) { 1636 ubi_err(ubi, "Unable to invalidate current fastmap!"); 1637 ubi_ro_mode(ubi); 1638 } else { 1639 return_fm_pebs(ubi, old_fm); 1640 return_fm_pebs(ubi, new_fm); 1641 ret = 0; 1642 } 1643 1644 kfree(new_fm); 1645 goto out_unlock; 1646} 1647