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 */ 16 static 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 = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long), 24 GFP_KERNEL); 25 if (!ret) 26 return ERR_PTR(-ENOMEM); 27 28 return ret; 29 } 30 31 /** 32 * free_seen - free the seen logic integer array. 33 * @seen: integer array of @ubi->peb_count size 34 */ 35 static inline void free_seen(unsigned long *seen) 36 { 37 kfree(seen); 38 } 39 40 /** 41 * set_seen - mark a PEB as seen. 42 * @ubi: UBI device description object 43 * @pnum: The PEB to be makred as seen 44 * @seen: integer array of @ubi->peb_count size 45 */ 46 static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen) 47 { 48 if (!ubi_dbg_chk_fastmap(ubi) || !seen) 49 return; 50 51 set_bit(pnum, seen); 52 } 53 54 /** 55 * self_check_seen - check whether all PEB have been seen by fastmap. 56 * @ubi: UBI device description object 57 * @seen: integer array of @ubi->peb_count size 58 */ 59 static int self_check_seen(struct ubi_device *ubi, unsigned long *seen) 60 { 61 int pnum, ret = 0; 62 63 if (!ubi_dbg_chk_fastmap(ubi) || !seen) 64 return 0; 65 66 for (pnum = 0; pnum < ubi->peb_count; pnum++) { 67 if (test_bit(pnum, seen) && ubi->lookuptbl[pnum]) { 68 ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum); 69 ret = -EINVAL; 70 } 71 } 72 73 return ret; 74 } 75 76 /** 77 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device. 78 * @ubi: UBI device description object 79 */ 80 size_t ubi_calc_fm_size(struct ubi_device *ubi) 81 { 82 size_t size; 83 84 size = sizeof(struct ubi_fm_sb) + 85 sizeof(struct ubi_fm_hdr) + 86 sizeof(struct ubi_fm_scan_pool) + 87 sizeof(struct ubi_fm_scan_pool) + 88 (ubi->peb_count * sizeof(struct ubi_fm_ec)) + 89 (sizeof(struct ubi_fm_eba) + 90 (ubi->peb_count * sizeof(__be32))) + 91 sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES; 92 return roundup(size, ubi->leb_size); 93 } 94 95 96 /** 97 * new_fm_vhdr - 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 */ 104 static 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_KERNEL); 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; 121 122 out: 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 */ 136 static 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 */ 175 static 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 */ 203 static 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 */ 242 static 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 */ 336 static 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 */ 370 static 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 */ 400 static 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 add_aeb(ai, free, pnum, ec, scrub); 472 continue; 473 } else if (err == 0 || err == UBI_IO_BITFLIPS) { 474 dbg_bld("Found non empty PEB:%i in pool", pnum); 475 476 if (err == UBI_IO_BITFLIPS) 477 scrub = 1; 478 479 new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec)); 480 if (!new_aeb) { 481 ret = -ENOMEM; 482 goto out; 483 } 484 485 new_aeb->lnum = be32_to_cpu(vh->lnum); 486 new_aeb->sqnum = be64_to_cpu(vh->sqnum); 487 new_aeb->copy_flag = vh->copy_flag; 488 new_aeb->scrub = scrub; 489 490 if (*max_sqnum < new_aeb->sqnum) 491 *max_sqnum = new_aeb->sqnum; 492 493 err = process_pool_aeb(ubi, ai, vh, new_aeb); 494 if (err) { 495 ret = err > 0 ? UBI_BAD_FASTMAP : err; 496 goto out; 497 } 498 } else { 499 /* We are paranoid and fall back to scanning mode */ 500 ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!"); 501 ret = err > 0 ? UBI_BAD_FASTMAP : err; 502 goto out; 503 } 504 505 } 506 507 out: 508 ubi_free_vid_buf(vb); 509 kfree(ech); 510 return ret; 511 } 512 513 /** 514 * count_fastmap_pebs - Counts the PEBs found by fastmap. 515 * @ai: The UBI attach info object 516 */ 517 static int count_fastmap_pebs(struct ubi_attach_info *ai) 518 { 519 struct ubi_ainf_peb *aeb; 520 struct ubi_ainf_volume *av; 521 struct rb_node *rb1, *rb2; 522 int n = 0; 523 524 list_for_each_entry(aeb, &ai->erase, u.list) 525 n++; 526 527 list_for_each_entry(aeb, &ai->free, u.list) 528 n++; 529 530 ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb) 531 ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb) 532 n++; 533 534 return n; 535 } 536 537 /** 538 * ubi_attach_fastmap - creates ubi_attach_info from a fastmap. 539 * @ubi: UBI device object 540 * @ai: UBI attach info object 541 * @fm: the fastmap to be attached 542 * 543 * Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable. 544 * < 0 indicates an internal error. 545 */ 546 static int ubi_attach_fastmap(struct ubi_device *ubi, 547 struct ubi_attach_info *ai, 548 struct ubi_fastmap_layout *fm) 549 { 550 struct list_head used, free; 551 struct ubi_ainf_volume *av; 552 struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb; 553 struct ubi_fm_sb *fmsb; 554 struct ubi_fm_hdr *fmhdr; 555 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 556 struct ubi_fm_ec *fmec; 557 struct ubi_fm_volhdr *fmvhdr; 558 struct ubi_fm_eba *fm_eba; 559 int ret, i, j, pool_size, wl_pool_size; 560 size_t fm_pos = 0, fm_size = ubi->fm_size; 561 unsigned long long max_sqnum = 0; 562 void *fm_raw = ubi->fm_buf; 563 564 INIT_LIST_HEAD(&used); 565 INIT_LIST_HEAD(&free); 566 ai->min_ec = UBI_MAX_ERASECOUNTER; 567 568 fmsb = (struct ubi_fm_sb *)(fm_raw); 569 ai->max_sqnum = fmsb->sqnum; 570 fm_pos += sizeof(struct ubi_fm_sb); 571 if (fm_pos >= fm_size) 572 goto fail_bad; 573 574 fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 575 fm_pos += sizeof(*fmhdr); 576 if (fm_pos >= fm_size) 577 goto fail_bad; 578 579 if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) { 580 ubi_err(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x", 581 be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC); 582 goto fail_bad; 583 } 584 585 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 586 fm_pos += sizeof(*fmpl); 587 if (fm_pos >= fm_size) 588 goto fail_bad; 589 if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) { 590 ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x", 591 be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC); 592 goto fail_bad; 593 } 594 595 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 596 fm_pos += sizeof(*fmpl_wl); 597 if (fm_pos >= fm_size) 598 goto fail_bad; 599 if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) { 600 ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x", 601 be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC); 602 goto fail_bad; 603 } 604 605 pool_size = be16_to_cpu(fmpl->size); 606 wl_pool_size = be16_to_cpu(fmpl_wl->size); 607 fm->max_pool_size = be16_to_cpu(fmpl->max_size); 608 fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size); 609 610 if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) { 611 ubi_err(ubi, "bad pool size: %i", pool_size); 612 goto fail_bad; 613 } 614 615 if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) { 616 ubi_err(ubi, "bad WL pool size: %i", wl_pool_size); 617 goto fail_bad; 618 } 619 620 621 if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE || 622 fm->max_pool_size < 0) { 623 ubi_err(ubi, "bad maximal pool size: %i", fm->max_pool_size); 624 goto fail_bad; 625 } 626 627 if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE || 628 fm->max_wl_pool_size < 0) { 629 ubi_err(ubi, "bad maximal WL pool size: %i", 630 fm->max_wl_pool_size); 631 goto fail_bad; 632 } 633 634 /* read EC values from free list */ 635 for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) { 636 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 637 fm_pos += sizeof(*fmec); 638 if (fm_pos >= fm_size) 639 goto fail_bad; 640 641 add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum), 642 be32_to_cpu(fmec->ec), 0); 643 } 644 645 /* read EC values from used list */ 646 for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) { 647 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 648 fm_pos += sizeof(*fmec); 649 if (fm_pos >= fm_size) 650 goto fail_bad; 651 652 add_aeb(ai, &used, be32_to_cpu(fmec->pnum), 653 be32_to_cpu(fmec->ec), 0); 654 } 655 656 /* read EC values from scrub list */ 657 for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) { 658 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 659 fm_pos += sizeof(*fmec); 660 if (fm_pos >= fm_size) 661 goto fail_bad; 662 663 add_aeb(ai, &used, be32_to_cpu(fmec->pnum), 664 be32_to_cpu(fmec->ec), 1); 665 } 666 667 /* read EC values from erase list */ 668 for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) { 669 fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 670 fm_pos += sizeof(*fmec); 671 if (fm_pos >= fm_size) 672 goto fail_bad; 673 674 add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum), 675 be32_to_cpu(fmec->ec), 1); 676 } 677 678 ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count); 679 ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count); 680 681 /* Iterate over all volumes and read their EBA table */ 682 for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) { 683 fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); 684 fm_pos += sizeof(*fmvhdr); 685 if (fm_pos >= fm_size) 686 goto fail_bad; 687 688 if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) { 689 ubi_err(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x", 690 be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC); 691 goto fail_bad; 692 } 693 694 av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id), 695 be32_to_cpu(fmvhdr->used_ebs), 696 be32_to_cpu(fmvhdr->data_pad), 697 fmvhdr->vol_type, 698 be32_to_cpu(fmvhdr->last_eb_bytes)); 699 700 if (IS_ERR(av)) { 701 if (PTR_ERR(av) == -EEXIST) 702 ubi_err(ubi, "volume (ID %i) already exists", 703 fmvhdr->vol_id); 704 705 goto fail_bad; 706 } 707 708 ai->vols_found++; 709 if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id)) 710 ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id); 711 712 fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos); 713 fm_pos += sizeof(*fm_eba); 714 fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs)); 715 if (fm_pos >= fm_size) 716 goto fail_bad; 717 718 if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) { 719 ubi_err(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x", 720 be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC); 721 goto fail_bad; 722 } 723 724 for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) { 725 int pnum = be32_to_cpu(fm_eba->pnum[j]); 726 727 if (pnum < 0) 728 continue; 729 730 aeb = NULL; 731 list_for_each_entry(tmp_aeb, &used, u.list) { 732 if (tmp_aeb->pnum == pnum) { 733 aeb = tmp_aeb; 734 break; 735 } 736 } 737 738 if (!aeb) { 739 ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum); 740 goto fail_bad; 741 } 742 743 aeb->lnum = j; 744 745 if (av->highest_lnum <= aeb->lnum) 746 av->highest_lnum = aeb->lnum; 747 748 assign_aeb_to_av(ai, aeb, av); 749 750 dbg_bld("inserting PEB:%i (LEB %i) to vol %i", 751 aeb->pnum, aeb->lnum, av->vol_id); 752 } 753 } 754 755 ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free); 756 if (ret) 757 goto fail; 758 759 ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free); 760 if (ret) 761 goto fail; 762 763 if (max_sqnum > ai->max_sqnum) 764 ai->max_sqnum = max_sqnum; 765 766 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) 767 list_move_tail(&tmp_aeb->u.list, &ai->free); 768 769 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) 770 list_move_tail(&tmp_aeb->u.list, &ai->erase); 771 772 ubi_assert(list_empty(&free)); 773 774 /* 775 * If fastmap is leaking PEBs (must not happen), raise a 776 * fat warning and fall back to scanning mode. 777 * We do this here because in ubi_wl_init() it's too late 778 * and we cannot fall back to scanning. 779 */ 780 if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count - 781 ai->bad_peb_count - fm->used_blocks)) 782 goto fail_bad; 783 784 return 0; 785 786 fail_bad: 787 ret = UBI_BAD_FASTMAP; 788 fail: 789 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) { 790 list_del(&tmp_aeb->u.list); 791 ubi_free_aeb(ai, tmp_aeb); 792 } 793 list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) { 794 list_del(&tmp_aeb->u.list); 795 ubi_free_aeb(ai, tmp_aeb); 796 } 797 798 return ret; 799 } 800 801 /** 802 * find_fm_anchor - find the most recent Fastmap superblock (anchor) 803 * @ai: UBI attach info to be filled 804 */ 805 static int find_fm_anchor(struct ubi_attach_info *ai) 806 { 807 int ret = -1; 808 struct ubi_ainf_peb *aeb; 809 unsigned long long max_sqnum = 0; 810 811 list_for_each_entry(aeb, &ai->fastmap, u.list) { 812 if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) { 813 max_sqnum = aeb->sqnum; 814 ret = aeb->pnum; 815 } 816 } 817 818 return ret; 819 } 820 821 static struct ubi_ainf_peb *clone_aeb(struct ubi_attach_info *ai, 822 struct ubi_ainf_peb *old) 823 { 824 struct ubi_ainf_peb *new; 825 826 new = ubi_alloc_aeb(ai, old->pnum, old->ec); 827 if (!new) 828 return NULL; 829 830 new->vol_id = old->vol_id; 831 new->sqnum = old->sqnum; 832 new->lnum = old->lnum; 833 new->scrub = old->scrub; 834 new->copy_flag = old->copy_flag; 835 836 return new; 837 } 838 839 /** 840 * ubi_scan_fastmap - scan the fastmap. 841 * @ubi: UBI device object 842 * @ai: UBI attach info to be filled 843 * @scan_ai: UBI attach info from the first 64 PEBs, 844 * used to find the most recent Fastmap data structure 845 * 846 * Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found, 847 * UBI_BAD_FASTMAP if one was found but is not usable. 848 * < 0 indicates an internal error. 849 */ 850 int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai, 851 struct ubi_attach_info *scan_ai) 852 { 853 struct ubi_fm_sb *fmsb, *fmsb2; 854 struct ubi_vid_io_buf *vb; 855 struct ubi_vid_hdr *vh; 856 struct ubi_ec_hdr *ech; 857 struct ubi_fastmap_layout *fm; 858 struct ubi_ainf_peb *aeb; 859 int i, used_blocks, pnum, fm_anchor, ret = 0; 860 size_t fm_size; 861 __be32 crc, tmp_crc; 862 unsigned long long sqnum = 0; 863 864 fm_anchor = find_fm_anchor(scan_ai); 865 if (fm_anchor < 0) 866 return UBI_NO_FASTMAP; 867 868 /* Copy all (possible) fastmap blocks into our new attach structure. */ 869 list_for_each_entry(aeb, &scan_ai->fastmap, u.list) { 870 struct ubi_ainf_peb *new; 871 872 new = clone_aeb(ai, aeb); 873 if (!new) 874 return -ENOMEM; 875 876 list_add(&new->u.list, &ai->fastmap); 877 } 878 879 down_write(&ubi->fm_protect); 880 memset(ubi->fm_buf, 0, ubi->fm_size); 881 882 fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL); 883 if (!fmsb) { 884 ret = -ENOMEM; 885 goto out; 886 } 887 888 fm = kzalloc(sizeof(*fm), GFP_KERNEL); 889 if (!fm) { 890 ret = -ENOMEM; 891 kfree(fmsb); 892 goto out; 893 } 894 895 ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, sizeof(*fmsb)); 896 if (ret && ret != UBI_IO_BITFLIPS) 897 goto free_fm_sb; 898 else if (ret == UBI_IO_BITFLIPS) 899 fm->to_be_tortured[0] = 1; 900 901 if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) { 902 ubi_err(ubi, "bad super block magic: 0x%x, expected: 0x%x", 903 be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC); 904 ret = UBI_BAD_FASTMAP; 905 goto free_fm_sb; 906 } 907 908 if (fmsb->version != UBI_FM_FMT_VERSION) { 909 ubi_err(ubi, "bad fastmap version: %i, expected: %i", 910 fmsb->version, UBI_FM_FMT_VERSION); 911 ret = UBI_BAD_FASTMAP; 912 goto free_fm_sb; 913 } 914 915 used_blocks = be32_to_cpu(fmsb->used_blocks); 916 if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) { 917 ubi_err(ubi, "number of fastmap blocks is invalid: %i", 918 used_blocks); 919 ret = UBI_BAD_FASTMAP; 920 goto free_fm_sb; 921 } 922 923 fm_size = ubi->leb_size * used_blocks; 924 if (fm_size != ubi->fm_size) { 925 ubi_err(ubi, "bad fastmap size: %zi, expected: %zi", 926 fm_size, ubi->fm_size); 927 ret = UBI_BAD_FASTMAP; 928 goto free_fm_sb; 929 } 930 931 ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 932 if (!ech) { 933 ret = -ENOMEM; 934 goto free_fm_sb; 935 } 936 937 vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL); 938 if (!vb) { 939 ret = -ENOMEM; 940 goto free_hdr; 941 } 942 943 vh = ubi_get_vid_hdr(vb); 944 945 for (i = 0; i < used_blocks; i++) { 946 int image_seq; 947 948 pnum = be32_to_cpu(fmsb->block_loc[i]); 949 950 if (ubi_io_is_bad(ubi, pnum)) { 951 ret = UBI_BAD_FASTMAP; 952 goto free_hdr; 953 } 954 955 if (i == 0 && pnum != fm_anchor) { 956 ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i", 957 pnum, fm_anchor); 958 ret = UBI_BAD_FASTMAP; 959 goto free_hdr; 960 } 961 962 ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0); 963 if (ret && ret != UBI_IO_BITFLIPS) { 964 ubi_err(ubi, "unable to read fastmap block# %i EC (PEB: %i)", 965 i, pnum); 966 if (ret > 0) 967 ret = UBI_BAD_FASTMAP; 968 goto free_hdr; 969 } else if (ret == UBI_IO_BITFLIPS) 970 fm->to_be_tortured[i] = 1; 971 972 image_seq = be32_to_cpu(ech->image_seq); 973 if (!ubi->image_seq) 974 ubi->image_seq = image_seq; 975 976 /* 977 * Older UBI implementations have image_seq set to zero, so 978 * we shouldn't fail if image_seq == 0. 979 */ 980 if (image_seq && (image_seq != ubi->image_seq)) { 981 ubi_err(ubi, "wrong image seq:%d instead of %d", 982 be32_to_cpu(ech->image_seq), ubi->image_seq); 983 ret = UBI_BAD_FASTMAP; 984 goto free_hdr; 985 } 986 987 ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0); 988 if (ret && ret != UBI_IO_BITFLIPS) { 989 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)", 990 i, pnum); 991 goto free_hdr; 992 } 993 994 if (i == 0) { 995 if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) { 996 ubi_err(ubi, "bad fastmap anchor vol_id: 0x%x, expected: 0x%x", 997 be32_to_cpu(vh->vol_id), 998 UBI_FM_SB_VOLUME_ID); 999 ret = UBI_BAD_FASTMAP; 1000 goto free_hdr; 1001 } 1002 } else { 1003 if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) { 1004 ubi_err(ubi, "bad fastmap data vol_id: 0x%x, expected: 0x%x", 1005 be32_to_cpu(vh->vol_id), 1006 UBI_FM_DATA_VOLUME_ID); 1007 ret = UBI_BAD_FASTMAP; 1008 goto free_hdr; 1009 } 1010 } 1011 1012 if (sqnum < be64_to_cpu(vh->sqnum)) 1013 sqnum = be64_to_cpu(vh->sqnum); 1014 1015 ret = ubi_io_read_data(ubi, ubi->fm_buf + (ubi->leb_size * i), 1016 pnum, 0, ubi->leb_size); 1017 if (ret && ret != UBI_IO_BITFLIPS) { 1018 ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i, " 1019 "err: %i)", i, pnum, ret); 1020 goto free_hdr; 1021 } 1022 } 1023 1024 kfree(fmsb); 1025 fmsb = NULL; 1026 1027 fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf); 1028 tmp_crc = be32_to_cpu(fmsb2->data_crc); 1029 fmsb2->data_crc = 0; 1030 crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size); 1031 if (crc != tmp_crc) { 1032 ubi_err(ubi, "fastmap data CRC is invalid"); 1033 ubi_err(ubi, "CRC should be: 0x%x, calc: 0x%x", 1034 tmp_crc, crc); 1035 ret = UBI_BAD_FASTMAP; 1036 goto free_hdr; 1037 } 1038 1039 fmsb2->sqnum = sqnum; 1040 1041 fm->used_blocks = used_blocks; 1042 1043 ret = ubi_attach_fastmap(ubi, ai, fm); 1044 if (ret) { 1045 if (ret > 0) 1046 ret = UBI_BAD_FASTMAP; 1047 goto free_hdr; 1048 } 1049 1050 for (i = 0; i < used_blocks; i++) { 1051 struct ubi_wl_entry *e; 1052 1053 e = kmem_cache_alloc(ubi_wl_entry_slab, GFP_KERNEL); 1054 if (!e) { 1055 while (i--) 1056 kmem_cache_free(ubi_wl_entry_slab, fm->e[i]); 1057 1058 ret = -ENOMEM; 1059 goto free_hdr; 1060 } 1061 1062 e->pnum = be32_to_cpu(fmsb2->block_loc[i]); 1063 e->ec = be32_to_cpu(fmsb2->block_ec[i]); 1064 fm->e[i] = e; 1065 } 1066 1067 ubi->fm = fm; 1068 ubi->fm_pool.max_size = ubi->fm->max_pool_size; 1069 ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size; 1070 ubi_msg(ubi, "attached by fastmap"); 1071 ubi_msg(ubi, "fastmap pool size: %d", ubi->fm_pool.max_size); 1072 ubi_msg(ubi, "fastmap WL pool size: %d", 1073 ubi->fm_wl_pool.max_size); 1074 ubi->fm_disabled = 0; 1075 ubi->fast_attach = 1; 1076 1077 ubi_free_vid_buf(vb); 1078 kfree(ech); 1079 out: 1080 up_write(&ubi->fm_protect); 1081 if (ret == UBI_BAD_FASTMAP) 1082 ubi_err(ubi, "Attach by fastmap failed, doing a full scan!"); 1083 return ret; 1084 1085 free_hdr: 1086 ubi_free_vid_buf(vb); 1087 kfree(ech); 1088 free_fm_sb: 1089 kfree(fmsb); 1090 kfree(fm); 1091 goto out; 1092 } 1093 1094 int ubi_fastmap_init_checkmap(struct ubi_volume *vol, int leb_count) 1095 { 1096 struct ubi_device *ubi = vol->ubi; 1097 1098 if (!ubi->fast_attach) 1099 return 0; 1100 1101 vol->checkmap = kcalloc(BITS_TO_LONGS(leb_count), sizeof(unsigned long), 1102 GFP_KERNEL); 1103 if (!vol->checkmap) 1104 return -ENOMEM; 1105 1106 return 0; 1107 } 1108 1109 void ubi_fastmap_destroy_checkmap(struct ubi_volume *vol) 1110 { 1111 kfree(vol->checkmap); 1112 } 1113 1114 /** 1115 * ubi_write_fastmap - writes a fastmap. 1116 * @ubi: UBI device object 1117 * @new_fm: the to be written fastmap 1118 * 1119 * Returns 0 on success, < 0 indicates an internal error. 1120 */ 1121 static int ubi_write_fastmap(struct ubi_device *ubi, 1122 struct ubi_fastmap_layout *new_fm) 1123 { 1124 size_t fm_pos = 0; 1125 void *fm_raw; 1126 struct ubi_fm_sb *fmsb; 1127 struct ubi_fm_hdr *fmh; 1128 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 1129 struct ubi_fm_ec *fec; 1130 struct ubi_fm_volhdr *fvh; 1131 struct ubi_fm_eba *feba; 1132 struct ubi_wl_entry *wl_e; 1133 struct ubi_volume *vol; 1134 struct ubi_vid_io_buf *avbuf, *dvbuf; 1135 struct ubi_vid_hdr *avhdr, *dvhdr; 1136 struct ubi_work *ubi_wrk; 1137 struct rb_node *tmp_rb; 1138 int ret, i, j, free_peb_count, used_peb_count, vol_count; 1139 int scrub_peb_count, erase_peb_count; 1140 unsigned long *seen_pebs = NULL; 1141 1142 fm_raw = ubi->fm_buf; 1143 memset(ubi->fm_buf, 0, ubi->fm_size); 1144 1145 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1146 if (!avbuf) { 1147 ret = -ENOMEM; 1148 goto out; 1149 } 1150 1151 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID); 1152 if (!dvbuf) { 1153 ret = -ENOMEM; 1154 goto out_kfree; 1155 } 1156 1157 avhdr = ubi_get_vid_hdr(avbuf); 1158 dvhdr = ubi_get_vid_hdr(dvbuf); 1159 1160 seen_pebs = init_seen(ubi); 1161 if (IS_ERR(seen_pebs)) { 1162 ret = PTR_ERR(seen_pebs); 1163 goto out_kfree; 1164 } 1165 1166 spin_lock(&ubi->volumes_lock); 1167 spin_lock(&ubi->wl_lock); 1168 1169 fmsb = (struct ubi_fm_sb *)fm_raw; 1170 fm_pos += sizeof(*fmsb); 1171 ubi_assert(fm_pos <= ubi->fm_size); 1172 1173 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 1174 fm_pos += sizeof(*fmh); 1175 ubi_assert(fm_pos <= ubi->fm_size); 1176 1177 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC); 1178 fmsb->version = UBI_FM_FMT_VERSION; 1179 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks); 1180 /* the max sqnum will be filled in while *reading* the fastmap */ 1181 fmsb->sqnum = 0; 1182 1183 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC); 1184 free_peb_count = 0; 1185 used_peb_count = 0; 1186 scrub_peb_count = 0; 1187 erase_peb_count = 0; 1188 vol_count = 0; 1189 1190 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1191 fm_pos += sizeof(*fmpl); 1192 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1193 fmpl->size = cpu_to_be16(ubi->fm_pool.size); 1194 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size); 1195 1196 for (i = 0; i < ubi->fm_pool.size; i++) { 1197 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]); 1198 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs); 1199 } 1200 1201 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1202 fm_pos += sizeof(*fmpl_wl); 1203 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1204 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size); 1205 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size); 1206 1207 for (i = 0; i < ubi->fm_wl_pool.size; i++) { 1208 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]); 1209 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs); 1210 } 1211 1212 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) { 1213 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1214 1215 fec->pnum = cpu_to_be32(wl_e->pnum); 1216 set_seen(ubi, wl_e->pnum, seen_pebs); 1217 fec->ec = cpu_to_be32(wl_e->ec); 1218 1219 free_peb_count++; 1220 fm_pos += sizeof(*fec); 1221 ubi_assert(fm_pos <= ubi->fm_size); 1222 } 1223 fmh->free_peb_count = cpu_to_be32(free_peb_count); 1224 1225 ubi_for_each_used_peb(ubi, wl_e, tmp_rb) { 1226 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1227 1228 fec->pnum = cpu_to_be32(wl_e->pnum); 1229 set_seen(ubi, wl_e->pnum, seen_pebs); 1230 fec->ec = cpu_to_be32(wl_e->ec); 1231 1232 used_peb_count++; 1233 fm_pos += sizeof(*fec); 1234 ubi_assert(fm_pos <= ubi->fm_size); 1235 } 1236 1237 ubi_for_each_protected_peb(ubi, i, wl_e) { 1238 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1239 1240 fec->pnum = cpu_to_be32(wl_e->pnum); 1241 set_seen(ubi, wl_e->pnum, seen_pebs); 1242 fec->ec = cpu_to_be32(wl_e->ec); 1243 1244 used_peb_count++; 1245 fm_pos += sizeof(*fec); 1246 ubi_assert(fm_pos <= ubi->fm_size); 1247 } 1248 fmh->used_peb_count = cpu_to_be32(used_peb_count); 1249 1250 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) { 1251 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1252 1253 fec->pnum = cpu_to_be32(wl_e->pnum); 1254 set_seen(ubi, wl_e->pnum, seen_pebs); 1255 fec->ec = cpu_to_be32(wl_e->ec); 1256 1257 scrub_peb_count++; 1258 fm_pos += sizeof(*fec); 1259 ubi_assert(fm_pos <= ubi->fm_size); 1260 } 1261 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count); 1262 1263 1264 list_for_each_entry(ubi_wrk, &ubi->works, list) { 1265 if (ubi_is_erase_work(ubi_wrk)) { 1266 wl_e = ubi_wrk->e; 1267 ubi_assert(wl_e); 1268 1269 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1270 1271 fec->pnum = cpu_to_be32(wl_e->pnum); 1272 set_seen(ubi, wl_e->pnum, seen_pebs); 1273 fec->ec = cpu_to_be32(wl_e->ec); 1274 1275 erase_peb_count++; 1276 fm_pos += sizeof(*fec); 1277 ubi_assert(fm_pos <= ubi->fm_size); 1278 } 1279 } 1280 fmh->erase_peb_count = cpu_to_be32(erase_peb_count); 1281 1282 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) { 1283 vol = ubi->volumes[i]; 1284 1285 if (!vol) 1286 continue; 1287 1288 vol_count++; 1289 1290 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); 1291 fm_pos += sizeof(*fvh); 1292 ubi_assert(fm_pos <= ubi->fm_size); 1293 1294 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC); 1295 fvh->vol_id = cpu_to_be32(vol->vol_id); 1296 fvh->vol_type = vol->vol_type; 1297 fvh->used_ebs = cpu_to_be32(vol->used_ebs); 1298 fvh->data_pad = cpu_to_be32(vol->data_pad); 1299 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes); 1300 1301 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME || 1302 vol->vol_type == UBI_STATIC_VOLUME); 1303 1304 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos); 1305 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs); 1306 ubi_assert(fm_pos <= ubi->fm_size); 1307 1308 for (j = 0; j < vol->reserved_pebs; j++) { 1309 struct ubi_eba_leb_desc ldesc; 1310 1311 ubi_eba_get_ldesc(vol, j, &ldesc); 1312 feba->pnum[j] = cpu_to_be32(ldesc.pnum); 1313 } 1314 1315 feba->reserved_pebs = cpu_to_be32(j); 1316 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC); 1317 } 1318 fmh->vol_count = cpu_to_be32(vol_count); 1319 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count); 1320 1321 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1322 avhdr->lnum = 0; 1323 1324 spin_unlock(&ubi->wl_lock); 1325 spin_unlock(&ubi->volumes_lock); 1326 1327 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum); 1328 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf); 1329 if (ret) { 1330 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!"); 1331 goto out_kfree; 1332 } 1333 1334 for (i = 0; i < new_fm->used_blocks; i++) { 1335 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum); 1336 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs); 1337 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec); 1338 } 1339 1340 fmsb->data_crc = 0; 1341 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw, 1342 ubi->fm_size)); 1343 1344 for (i = 1; i < new_fm->used_blocks; i++) { 1345 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1346 dvhdr->lnum = cpu_to_be32(i); 1347 dbg_bld("writing fastmap data to PEB %i sqnum %llu", 1348 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum)); 1349 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf); 1350 if (ret) { 1351 ubi_err(ubi, "unable to write vid_hdr to PEB %i!", 1352 new_fm->e[i]->pnum); 1353 goto out_kfree; 1354 } 1355 } 1356 1357 for (i = 0; i < new_fm->used_blocks; i++) { 1358 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size), 1359 new_fm->e[i]->pnum, 0, ubi->leb_size); 1360 if (ret) { 1361 ubi_err(ubi, "unable to write fastmap to PEB %i!", 1362 new_fm->e[i]->pnum); 1363 goto out_kfree; 1364 } 1365 } 1366 1367 ubi_assert(new_fm); 1368 ubi->fm = new_fm; 1369 1370 ret = self_check_seen(ubi, seen_pebs); 1371 dbg_bld("fastmap written!"); 1372 1373 out_kfree: 1374 ubi_free_vid_buf(avbuf); 1375 ubi_free_vid_buf(dvbuf); 1376 free_seen(seen_pebs); 1377 out: 1378 return ret; 1379 } 1380 1381 /** 1382 * erase_block - Manually erase a PEB. 1383 * @ubi: UBI device object 1384 * @pnum: PEB to be erased 1385 * 1386 * Returns the new EC value on success, < 0 indicates an internal error. 1387 */ 1388 static int erase_block(struct ubi_device *ubi, int pnum) 1389 { 1390 int ret; 1391 struct ubi_ec_hdr *ec_hdr; 1392 long long ec; 1393 1394 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 1395 if (!ec_hdr) 1396 return -ENOMEM; 1397 1398 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0); 1399 if (ret < 0) 1400 goto out; 1401 else if (ret && ret != UBI_IO_BITFLIPS) { 1402 ret = -EINVAL; 1403 goto out; 1404 } 1405 1406 ret = ubi_io_sync_erase(ubi, pnum, 0); 1407 if (ret < 0) 1408 goto out; 1409 1410 ec = be64_to_cpu(ec_hdr->ec); 1411 ec += ret; 1412 if (ec > UBI_MAX_ERASECOUNTER) { 1413 ret = -EINVAL; 1414 goto out; 1415 } 1416 1417 ec_hdr->ec = cpu_to_be64(ec); 1418 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr); 1419 if (ret < 0) 1420 goto out; 1421 1422 ret = ec; 1423 out: 1424 kfree(ec_hdr); 1425 return ret; 1426 } 1427 1428 /** 1429 * invalidate_fastmap - destroys a fastmap. 1430 * @ubi: UBI device object 1431 * 1432 * This function ensures that upon next UBI attach a full scan 1433 * is issued. We need this if UBI is about to write a new fastmap 1434 * but is unable to do so. In this case we have two options: 1435 * a) Make sure that the current fastmap will not be usued upon 1436 * attach time and contine or b) fall back to RO mode to have the 1437 * current fastmap in a valid state. 1438 * Returns 0 on success, < 0 indicates an internal error. 1439 */ 1440 static int invalidate_fastmap(struct ubi_device *ubi) 1441 { 1442 int ret; 1443 struct ubi_fastmap_layout *fm; 1444 struct ubi_wl_entry *e; 1445 struct ubi_vid_io_buf *vb = NULL; 1446 struct ubi_vid_hdr *vh; 1447 1448 if (!ubi->fm) 1449 return 0; 1450 1451 ubi->fm = NULL; 1452 1453 ret = -ENOMEM; 1454 fm = kzalloc(sizeof(*fm), GFP_KERNEL); 1455 if (!fm) 1456 goto out; 1457 1458 vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1459 if (!vb) 1460 goto out_free_fm; 1461 1462 vh = ubi_get_vid_hdr(vb); 1463 1464 ret = -ENOSPC; 1465 e = ubi_wl_get_fm_peb(ubi, 1); 1466 if (!e) 1467 goto out_free_fm; 1468 1469 /* 1470 * Create fake fastmap such that UBI will fall back 1471 * to scanning mode. 1472 */ 1473 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1474 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb); 1475 if (ret < 0) { 1476 ubi_wl_put_fm_peb(ubi, e, 0, 0); 1477 goto out_free_fm; 1478 } 1479 1480 fm->used_blocks = 1; 1481 fm->e[0] = e; 1482 1483 ubi->fm = fm; 1484 1485 out: 1486 ubi_free_vid_buf(vb); 1487 return ret; 1488 1489 out_free_fm: 1490 kfree(fm); 1491 goto out; 1492 } 1493 1494 /** 1495 * return_fm_pebs - returns all PEBs used by a fastmap back to the 1496 * WL sub-system. 1497 * @ubi: UBI device object 1498 * @fm: fastmap layout object 1499 */ 1500 static void return_fm_pebs(struct ubi_device *ubi, 1501 struct ubi_fastmap_layout *fm) 1502 { 1503 int i; 1504 1505 if (!fm) 1506 return; 1507 1508 for (i = 0; i < fm->used_blocks; i++) { 1509 if (fm->e[i]) { 1510 ubi_wl_put_fm_peb(ubi, fm->e[i], i, 1511 fm->to_be_tortured[i]); 1512 fm->e[i] = NULL; 1513 } 1514 } 1515 } 1516 1517 /** 1518 * ubi_update_fastmap - will be called by UBI if a volume changes or 1519 * a fastmap pool becomes full. 1520 * @ubi: UBI device object 1521 * 1522 * Returns 0 on success, < 0 indicates an internal error. 1523 */ 1524 int ubi_update_fastmap(struct ubi_device *ubi) 1525 { 1526 int ret, i, j; 1527 struct ubi_fastmap_layout *new_fm, *old_fm; 1528 struct ubi_wl_entry *tmp_e; 1529 1530 down_write(&ubi->fm_protect); 1531 down_write(&ubi->work_sem); 1532 down_write(&ubi->fm_eba_sem); 1533 1534 ubi_refill_pools(ubi); 1535 1536 if (ubi->ro_mode || ubi->fm_disabled) { 1537 up_write(&ubi->fm_eba_sem); 1538 up_write(&ubi->work_sem); 1539 up_write(&ubi->fm_protect); 1540 return 0; 1541 } 1542 1543 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL); 1544 if (!new_fm) { 1545 up_write(&ubi->fm_eba_sem); 1546 up_write(&ubi->work_sem); 1547 up_write(&ubi->fm_protect); 1548 return -ENOMEM; 1549 } 1550 1551 new_fm->used_blocks = ubi->fm_size / ubi->leb_size; 1552 old_fm = ubi->fm; 1553 ubi->fm = NULL; 1554 1555 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) { 1556 ubi_err(ubi, "fastmap too large"); 1557 ret = -ENOSPC; 1558 goto err; 1559 } 1560 1561 for (i = 1; i < new_fm->used_blocks; i++) { 1562 spin_lock(&ubi->wl_lock); 1563 tmp_e = ubi_wl_get_fm_peb(ubi, 0); 1564 spin_unlock(&ubi->wl_lock); 1565 1566 if (!tmp_e) { 1567 if (old_fm && old_fm->e[i]) { 1568 ret = erase_block(ubi, old_fm->e[i]->pnum); 1569 if (ret < 0) { 1570 ubi_err(ubi, "could not erase old fastmap PEB"); 1571 1572 for (j = 1; j < i; j++) { 1573 ubi_wl_put_fm_peb(ubi, new_fm->e[j], 1574 j, 0); 1575 new_fm->e[j] = NULL; 1576 } 1577 goto err; 1578 } 1579 new_fm->e[i] = old_fm->e[i]; 1580 old_fm->e[i] = NULL; 1581 } else { 1582 ubi_err(ubi, "could not get any free erase block"); 1583 1584 for (j = 1; j < i; j++) { 1585 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0); 1586 new_fm->e[j] = NULL; 1587 } 1588 1589 ret = -ENOSPC; 1590 goto err; 1591 } 1592 } else { 1593 new_fm->e[i] = tmp_e; 1594 1595 if (old_fm && old_fm->e[i]) { 1596 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1597 old_fm->to_be_tortured[i]); 1598 old_fm->e[i] = NULL; 1599 } 1600 } 1601 } 1602 1603 /* Old fastmap is larger than the new one */ 1604 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) { 1605 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) { 1606 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1607 old_fm->to_be_tortured[i]); 1608 old_fm->e[i] = NULL; 1609 } 1610 } 1611 1612 spin_lock(&ubi->wl_lock); 1613 tmp_e = ubi->fm_anchor; 1614 ubi->fm_anchor = NULL; 1615 spin_unlock(&ubi->wl_lock); 1616 1617 if (old_fm) { 1618 /* no fresh anchor PEB was found, reuse the old one */ 1619 if (!tmp_e) { 1620 ret = erase_block(ubi, old_fm->e[0]->pnum); 1621 if (ret < 0) { 1622 ubi_err(ubi, "could not erase old anchor PEB"); 1623 1624 for (i = 1; i < new_fm->used_blocks; i++) { 1625 ubi_wl_put_fm_peb(ubi, new_fm->e[i], 1626 i, 0); 1627 new_fm->e[i] = NULL; 1628 } 1629 goto err; 1630 } 1631 new_fm->e[0] = old_fm->e[0]; 1632 new_fm->e[0]->ec = ret; 1633 old_fm->e[0] = NULL; 1634 } else { 1635 /* we've got a new anchor PEB, return the old one */ 1636 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0, 1637 old_fm->to_be_tortured[0]); 1638 new_fm->e[0] = tmp_e; 1639 old_fm->e[0] = NULL; 1640 } 1641 } else { 1642 if (!tmp_e) { 1643 ubi_err(ubi, "could not find any anchor PEB"); 1644 1645 for (i = 1; i < new_fm->used_blocks; i++) { 1646 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0); 1647 new_fm->e[i] = NULL; 1648 } 1649 1650 ret = -ENOSPC; 1651 goto err; 1652 } 1653 new_fm->e[0] = tmp_e; 1654 } 1655 1656 ret = ubi_write_fastmap(ubi, new_fm); 1657 1658 if (ret) 1659 goto err; 1660 1661 out_unlock: 1662 up_write(&ubi->fm_eba_sem); 1663 up_write(&ubi->work_sem); 1664 up_write(&ubi->fm_protect); 1665 kfree(old_fm); 1666 1667 ubi_ensure_anchor_pebs(ubi); 1668 1669 return ret; 1670 1671 err: 1672 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret); 1673 1674 ret = invalidate_fastmap(ubi); 1675 if (ret < 0) { 1676 ubi_err(ubi, "Unable to invalidate current fastmap!"); 1677 ubi_ro_mode(ubi); 1678 } else { 1679 return_fm_pebs(ubi, old_fm); 1680 return_fm_pebs(ubi, new_fm); 1681 ret = 0; 1682 } 1683 1684 kfree(new_fm); 1685 goto out_unlock; 1686 } 1687