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 static 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 */ 860 int 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 kfree(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); 1089 out: 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 1095 free_hdr: 1096 ubi_free_vid_buf(vb); 1097 kfree(ech); 1098 free_fm_sb: 1099 kfree(fmsb); 1100 kfree(fm); 1101 goto out; 1102 } 1103 1104 /** 1105 * ubi_write_fastmap - writes a fastmap. 1106 * @ubi: UBI device object 1107 * @new_fm: the to be written fastmap 1108 * 1109 * Returns 0 on success, < 0 indicates an internal error. 1110 */ 1111 static int ubi_write_fastmap(struct ubi_device *ubi, 1112 struct ubi_fastmap_layout *new_fm) 1113 { 1114 size_t fm_pos = 0; 1115 void *fm_raw; 1116 struct ubi_fm_sb *fmsb; 1117 struct ubi_fm_hdr *fmh; 1118 struct ubi_fm_scan_pool *fmpl, *fmpl_wl; 1119 struct ubi_fm_ec *fec; 1120 struct ubi_fm_volhdr *fvh; 1121 struct ubi_fm_eba *feba; 1122 struct ubi_wl_entry *wl_e; 1123 struct ubi_volume *vol; 1124 struct ubi_vid_io_buf *avbuf, *dvbuf; 1125 struct ubi_vid_hdr *avhdr, *dvhdr; 1126 struct ubi_work *ubi_wrk; 1127 struct rb_node *tmp_rb; 1128 int ret, i, j, free_peb_count, used_peb_count, vol_count; 1129 int scrub_peb_count, erase_peb_count; 1130 unsigned long *seen_pebs = NULL; 1131 1132 fm_raw = ubi->fm_buf; 1133 memset(ubi->fm_buf, 0, ubi->fm_size); 1134 1135 avbuf = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1136 if (!avbuf) { 1137 ret = -ENOMEM; 1138 goto out; 1139 } 1140 1141 dvbuf = new_fm_vbuf(ubi, UBI_FM_DATA_VOLUME_ID); 1142 if (!dvbuf) { 1143 ret = -ENOMEM; 1144 goto out_kfree; 1145 } 1146 1147 avhdr = ubi_get_vid_hdr(avbuf); 1148 dvhdr = ubi_get_vid_hdr(dvbuf); 1149 1150 seen_pebs = init_seen(ubi); 1151 if (IS_ERR(seen_pebs)) { 1152 ret = PTR_ERR(seen_pebs); 1153 goto out_kfree; 1154 } 1155 1156 spin_lock(&ubi->volumes_lock); 1157 spin_lock(&ubi->wl_lock); 1158 1159 fmsb = (struct ubi_fm_sb *)fm_raw; 1160 fm_pos += sizeof(*fmsb); 1161 ubi_assert(fm_pos <= ubi->fm_size); 1162 1163 fmh = (struct ubi_fm_hdr *)(fm_raw + fm_pos); 1164 fm_pos += sizeof(*fmh); 1165 ubi_assert(fm_pos <= ubi->fm_size); 1166 1167 fmsb->magic = cpu_to_be32(UBI_FM_SB_MAGIC); 1168 fmsb->version = UBI_FM_FMT_VERSION; 1169 fmsb->used_blocks = cpu_to_be32(new_fm->used_blocks); 1170 /* the max sqnum will be filled in while *reading* the fastmap */ 1171 fmsb->sqnum = 0; 1172 1173 fmh->magic = cpu_to_be32(UBI_FM_HDR_MAGIC); 1174 free_peb_count = 0; 1175 used_peb_count = 0; 1176 scrub_peb_count = 0; 1177 erase_peb_count = 0; 1178 vol_count = 0; 1179 1180 fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1181 fm_pos += sizeof(*fmpl); 1182 fmpl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1183 fmpl->size = cpu_to_be16(ubi->fm_pool.size); 1184 fmpl->max_size = cpu_to_be16(ubi->fm_pool.max_size); 1185 1186 for (i = 0; i < ubi->fm_pool.size; i++) { 1187 fmpl->pebs[i] = cpu_to_be32(ubi->fm_pool.pebs[i]); 1188 set_seen(ubi, ubi->fm_pool.pebs[i], seen_pebs); 1189 } 1190 1191 fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos); 1192 fm_pos += sizeof(*fmpl_wl); 1193 fmpl_wl->magic = cpu_to_be32(UBI_FM_POOL_MAGIC); 1194 fmpl_wl->size = cpu_to_be16(ubi->fm_wl_pool.size); 1195 fmpl_wl->max_size = cpu_to_be16(ubi->fm_wl_pool.max_size); 1196 1197 for (i = 0; i < ubi->fm_wl_pool.size; i++) { 1198 fmpl_wl->pebs[i] = cpu_to_be32(ubi->fm_wl_pool.pebs[i]); 1199 set_seen(ubi, ubi->fm_wl_pool.pebs[i], seen_pebs); 1200 } 1201 1202 ubi_for_each_free_peb(ubi, wl_e, tmp_rb) { 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 free_peb_count++; 1210 fm_pos += sizeof(*fec); 1211 ubi_assert(fm_pos <= ubi->fm_size); 1212 } 1213 fmh->free_peb_count = cpu_to_be32(free_peb_count); 1214 1215 ubi_for_each_used_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 used_peb_count++; 1223 fm_pos += sizeof(*fec); 1224 ubi_assert(fm_pos <= ubi->fm_size); 1225 } 1226 1227 ubi_for_each_protected_peb(ubi, i, wl_e) { 1228 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1229 1230 fec->pnum = cpu_to_be32(wl_e->pnum); 1231 set_seen(ubi, wl_e->pnum, seen_pebs); 1232 fec->ec = cpu_to_be32(wl_e->ec); 1233 1234 used_peb_count++; 1235 fm_pos += sizeof(*fec); 1236 ubi_assert(fm_pos <= ubi->fm_size); 1237 } 1238 fmh->used_peb_count = cpu_to_be32(used_peb_count); 1239 1240 ubi_for_each_scrub_peb(ubi, wl_e, tmp_rb) { 1241 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1242 1243 fec->pnum = cpu_to_be32(wl_e->pnum); 1244 set_seen(ubi, wl_e->pnum, seen_pebs); 1245 fec->ec = cpu_to_be32(wl_e->ec); 1246 1247 scrub_peb_count++; 1248 fm_pos += sizeof(*fec); 1249 ubi_assert(fm_pos <= ubi->fm_size); 1250 } 1251 fmh->scrub_peb_count = cpu_to_be32(scrub_peb_count); 1252 1253 1254 list_for_each_entry(ubi_wrk, &ubi->works, list) { 1255 if (ubi_is_erase_work(ubi_wrk)) { 1256 wl_e = ubi_wrk->e; 1257 ubi_assert(wl_e); 1258 1259 fec = (struct ubi_fm_ec *)(fm_raw + fm_pos); 1260 1261 fec->pnum = cpu_to_be32(wl_e->pnum); 1262 set_seen(ubi, wl_e->pnum, seen_pebs); 1263 fec->ec = cpu_to_be32(wl_e->ec); 1264 1265 erase_peb_count++; 1266 fm_pos += sizeof(*fec); 1267 ubi_assert(fm_pos <= ubi->fm_size); 1268 } 1269 } 1270 fmh->erase_peb_count = cpu_to_be32(erase_peb_count); 1271 1272 for (i = 0; i < UBI_MAX_VOLUMES + UBI_INT_VOL_COUNT; i++) { 1273 vol = ubi->volumes[i]; 1274 1275 if (!vol) 1276 continue; 1277 1278 vol_count++; 1279 1280 fvh = (struct ubi_fm_volhdr *)(fm_raw + fm_pos); 1281 fm_pos += sizeof(*fvh); 1282 ubi_assert(fm_pos <= ubi->fm_size); 1283 1284 fvh->magic = cpu_to_be32(UBI_FM_VHDR_MAGIC); 1285 fvh->vol_id = cpu_to_be32(vol->vol_id); 1286 fvh->vol_type = vol->vol_type; 1287 fvh->used_ebs = cpu_to_be32(vol->used_ebs); 1288 fvh->data_pad = cpu_to_be32(vol->data_pad); 1289 fvh->last_eb_bytes = cpu_to_be32(vol->last_eb_bytes); 1290 1291 ubi_assert(vol->vol_type == UBI_DYNAMIC_VOLUME || 1292 vol->vol_type == UBI_STATIC_VOLUME); 1293 1294 feba = (struct ubi_fm_eba *)(fm_raw + fm_pos); 1295 fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs); 1296 ubi_assert(fm_pos <= ubi->fm_size); 1297 1298 for (j = 0; j < vol->reserved_pebs; j++) { 1299 struct ubi_eba_leb_desc ldesc; 1300 1301 ubi_eba_get_ldesc(vol, j, &ldesc); 1302 feba->pnum[j] = cpu_to_be32(ldesc.pnum); 1303 } 1304 1305 feba->reserved_pebs = cpu_to_be32(j); 1306 feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC); 1307 } 1308 fmh->vol_count = cpu_to_be32(vol_count); 1309 fmh->bad_peb_count = cpu_to_be32(ubi->bad_peb_count); 1310 1311 avhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1312 avhdr->lnum = 0; 1313 1314 spin_unlock(&ubi->wl_lock); 1315 spin_unlock(&ubi->volumes_lock); 1316 1317 dbg_bld("writing fastmap SB to PEB %i", new_fm->e[0]->pnum); 1318 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[0]->pnum, avbuf); 1319 if (ret) { 1320 ubi_err(ubi, "unable to write vid_hdr to fastmap SB!"); 1321 goto out_kfree; 1322 } 1323 1324 for (i = 0; i < new_fm->used_blocks; i++) { 1325 fmsb->block_loc[i] = cpu_to_be32(new_fm->e[i]->pnum); 1326 set_seen(ubi, new_fm->e[i]->pnum, seen_pebs); 1327 fmsb->block_ec[i] = cpu_to_be32(new_fm->e[i]->ec); 1328 } 1329 1330 fmsb->data_crc = 0; 1331 fmsb->data_crc = cpu_to_be32(crc32(UBI_CRC32_INIT, fm_raw, 1332 ubi->fm_size)); 1333 1334 for (i = 1; i < new_fm->used_blocks; i++) { 1335 dvhdr->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1336 dvhdr->lnum = cpu_to_be32(i); 1337 dbg_bld("writing fastmap data to PEB %i sqnum %llu", 1338 new_fm->e[i]->pnum, be64_to_cpu(dvhdr->sqnum)); 1339 ret = ubi_io_write_vid_hdr(ubi, new_fm->e[i]->pnum, dvbuf); 1340 if (ret) { 1341 ubi_err(ubi, "unable to write vid_hdr to PEB %i!", 1342 new_fm->e[i]->pnum); 1343 goto out_kfree; 1344 } 1345 } 1346 1347 for (i = 0; i < new_fm->used_blocks; i++) { 1348 ret = ubi_io_write_data(ubi, fm_raw + (i * ubi->leb_size), 1349 new_fm->e[i]->pnum, 0, ubi->leb_size); 1350 if (ret) { 1351 ubi_err(ubi, "unable to write fastmap to PEB %i!", 1352 new_fm->e[i]->pnum); 1353 goto out_kfree; 1354 } 1355 } 1356 1357 ubi_assert(new_fm); 1358 ubi->fm = new_fm; 1359 1360 ret = self_check_seen(ubi, seen_pebs); 1361 dbg_bld("fastmap written!"); 1362 1363 out_kfree: 1364 ubi_free_vid_buf(avbuf); 1365 ubi_free_vid_buf(dvbuf); 1366 free_seen(seen_pebs); 1367 out: 1368 return ret; 1369 } 1370 1371 /** 1372 * erase_block - Manually erase a PEB. 1373 * @ubi: UBI device object 1374 * @pnum: PEB to be erased 1375 * 1376 * Returns the new EC value on success, < 0 indicates an internal error. 1377 */ 1378 static int erase_block(struct ubi_device *ubi, int pnum) 1379 { 1380 int ret; 1381 struct ubi_ec_hdr *ec_hdr; 1382 long long ec; 1383 1384 ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL); 1385 if (!ec_hdr) 1386 return -ENOMEM; 1387 1388 ret = ubi_io_read_ec_hdr(ubi, pnum, ec_hdr, 0); 1389 if (ret < 0) 1390 goto out; 1391 else if (ret && ret != UBI_IO_BITFLIPS) { 1392 ret = -EINVAL; 1393 goto out; 1394 } 1395 1396 ret = ubi_io_sync_erase(ubi, pnum, 0); 1397 if (ret < 0) 1398 goto out; 1399 1400 ec = be64_to_cpu(ec_hdr->ec); 1401 ec += ret; 1402 if (ec > UBI_MAX_ERASECOUNTER) { 1403 ret = -EINVAL; 1404 goto out; 1405 } 1406 1407 ec_hdr->ec = cpu_to_be64(ec); 1408 ret = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr); 1409 if (ret < 0) 1410 goto out; 1411 1412 ret = ec; 1413 out: 1414 kfree(ec_hdr); 1415 return ret; 1416 } 1417 1418 /** 1419 * invalidate_fastmap - destroys a fastmap. 1420 * @ubi: UBI device object 1421 * 1422 * This function ensures that upon next UBI attach a full scan 1423 * is issued. We need this if UBI is about to write a new fastmap 1424 * but is unable to do so. In this case we have two options: 1425 * a) Make sure that the current fastmap will not be usued upon 1426 * attach time and contine or b) fall back to RO mode to have the 1427 * current fastmap in a valid state. 1428 * Returns 0 on success, < 0 indicates an internal error. 1429 */ 1430 static int invalidate_fastmap(struct ubi_device *ubi) 1431 { 1432 int ret; 1433 struct ubi_fastmap_layout *fm; 1434 struct ubi_wl_entry *e; 1435 struct ubi_vid_io_buf *vb = NULL; 1436 struct ubi_vid_hdr *vh; 1437 1438 if (!ubi->fm) 1439 return 0; 1440 1441 ubi->fm = NULL; 1442 1443 ret = -ENOMEM; 1444 fm = kzalloc(sizeof(*fm), GFP_KERNEL); 1445 if (!fm) 1446 goto out; 1447 1448 vb = new_fm_vbuf(ubi, UBI_FM_SB_VOLUME_ID); 1449 if (!vb) 1450 goto out_free_fm; 1451 1452 vh = ubi_get_vid_hdr(vb); 1453 1454 ret = -ENOSPC; 1455 e = ubi_wl_get_fm_peb(ubi, 1); 1456 if (!e) 1457 goto out_free_fm; 1458 1459 /* 1460 * Create fake fastmap such that UBI will fall back 1461 * to scanning mode. 1462 */ 1463 vh->sqnum = cpu_to_be64(ubi_next_sqnum(ubi)); 1464 ret = ubi_io_write_vid_hdr(ubi, e->pnum, vb); 1465 if (ret < 0) { 1466 ubi_wl_put_fm_peb(ubi, e, 0, 0); 1467 goto out_free_fm; 1468 } 1469 1470 fm->used_blocks = 1; 1471 fm->e[0] = e; 1472 1473 ubi->fm = fm; 1474 1475 out: 1476 ubi_free_vid_buf(vb); 1477 return ret; 1478 1479 out_free_fm: 1480 kfree(fm); 1481 goto out; 1482 } 1483 1484 /** 1485 * return_fm_pebs - returns all PEBs used by a fastmap back to the 1486 * WL sub-system. 1487 * @ubi: UBI device object 1488 * @fm: fastmap layout object 1489 */ 1490 static void return_fm_pebs(struct ubi_device *ubi, 1491 struct ubi_fastmap_layout *fm) 1492 { 1493 int i; 1494 1495 if (!fm) 1496 return; 1497 1498 for (i = 0; i < fm->used_blocks; i++) { 1499 if (fm->e[i]) { 1500 ubi_wl_put_fm_peb(ubi, fm->e[i], i, 1501 fm->to_be_tortured[i]); 1502 fm->e[i] = NULL; 1503 } 1504 } 1505 } 1506 1507 /** 1508 * ubi_update_fastmap - will be called by UBI if a volume changes or 1509 * a fastmap pool becomes full. 1510 * @ubi: UBI device object 1511 * 1512 * Returns 0 on success, < 0 indicates an internal error. 1513 */ 1514 int ubi_update_fastmap(struct ubi_device *ubi) 1515 { 1516 int ret, i, j; 1517 struct ubi_fastmap_layout *new_fm, *old_fm; 1518 struct ubi_wl_entry *tmp_e; 1519 1520 down_write(&ubi->fm_protect); 1521 down_write(&ubi->work_sem); 1522 down_write(&ubi->fm_eba_sem); 1523 1524 ubi_refill_pools(ubi); 1525 1526 if (ubi->ro_mode || ubi->fm_disabled) { 1527 up_write(&ubi->fm_eba_sem); 1528 up_write(&ubi->work_sem); 1529 up_write(&ubi->fm_protect); 1530 return 0; 1531 } 1532 1533 ret = ubi_ensure_anchor_pebs(ubi); 1534 if (ret) { 1535 up_write(&ubi->fm_eba_sem); 1536 up_write(&ubi->work_sem); 1537 up_write(&ubi->fm_protect); 1538 return ret; 1539 } 1540 1541 new_fm = kzalloc(sizeof(*new_fm), GFP_KERNEL); 1542 if (!new_fm) { 1543 up_write(&ubi->fm_eba_sem); 1544 up_write(&ubi->work_sem); 1545 up_write(&ubi->fm_protect); 1546 return -ENOMEM; 1547 } 1548 1549 new_fm->used_blocks = ubi->fm_size / ubi->leb_size; 1550 old_fm = ubi->fm; 1551 ubi->fm = NULL; 1552 1553 if (new_fm->used_blocks > UBI_FM_MAX_BLOCKS) { 1554 ubi_err(ubi, "fastmap too large"); 1555 ret = -ENOSPC; 1556 goto err; 1557 } 1558 1559 for (i = 1; i < new_fm->used_blocks; i++) { 1560 spin_lock(&ubi->wl_lock); 1561 tmp_e = ubi_wl_get_fm_peb(ubi, 0); 1562 spin_unlock(&ubi->wl_lock); 1563 1564 if (!tmp_e) { 1565 if (old_fm && old_fm->e[i]) { 1566 ret = erase_block(ubi, old_fm->e[i]->pnum); 1567 if (ret < 0) { 1568 ubi_err(ubi, "could not erase old fastmap PEB"); 1569 1570 for (j = 1; j < i; j++) { 1571 ubi_wl_put_fm_peb(ubi, new_fm->e[j], 1572 j, 0); 1573 new_fm->e[j] = NULL; 1574 } 1575 goto err; 1576 } 1577 new_fm->e[i] = old_fm->e[i]; 1578 old_fm->e[i] = NULL; 1579 } else { 1580 ubi_err(ubi, "could not get any free erase block"); 1581 1582 for (j = 1; j < i; j++) { 1583 ubi_wl_put_fm_peb(ubi, new_fm->e[j], j, 0); 1584 new_fm->e[j] = NULL; 1585 } 1586 1587 ret = -ENOSPC; 1588 goto err; 1589 } 1590 } else { 1591 new_fm->e[i] = tmp_e; 1592 1593 if (old_fm && old_fm->e[i]) { 1594 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1595 old_fm->to_be_tortured[i]); 1596 old_fm->e[i] = NULL; 1597 } 1598 } 1599 } 1600 1601 /* Old fastmap is larger than the new one */ 1602 if (old_fm && new_fm->used_blocks < old_fm->used_blocks) { 1603 for (i = new_fm->used_blocks; i < old_fm->used_blocks; i++) { 1604 ubi_wl_put_fm_peb(ubi, old_fm->e[i], i, 1605 old_fm->to_be_tortured[i]); 1606 old_fm->e[i] = NULL; 1607 } 1608 } 1609 1610 spin_lock(&ubi->wl_lock); 1611 tmp_e = ubi_wl_get_fm_peb(ubi, 1); 1612 spin_unlock(&ubi->wl_lock); 1613 1614 if (old_fm) { 1615 /* no fresh anchor PEB was found, reuse the old one */ 1616 if (!tmp_e) { 1617 ret = erase_block(ubi, old_fm->e[0]->pnum); 1618 if (ret < 0) { 1619 ubi_err(ubi, "could not erase old anchor PEB"); 1620 1621 for (i = 1; i < new_fm->used_blocks; i++) { 1622 ubi_wl_put_fm_peb(ubi, new_fm->e[i], 1623 i, 0); 1624 new_fm->e[i] = NULL; 1625 } 1626 goto err; 1627 } 1628 new_fm->e[0] = old_fm->e[0]; 1629 new_fm->e[0]->ec = ret; 1630 old_fm->e[0] = NULL; 1631 } else { 1632 /* we've got a new anchor PEB, return the old one */ 1633 ubi_wl_put_fm_peb(ubi, old_fm->e[0], 0, 1634 old_fm->to_be_tortured[0]); 1635 new_fm->e[0] = tmp_e; 1636 old_fm->e[0] = NULL; 1637 } 1638 } else { 1639 if (!tmp_e) { 1640 ubi_err(ubi, "could not find any anchor PEB"); 1641 1642 for (i = 1; i < new_fm->used_blocks; i++) { 1643 ubi_wl_put_fm_peb(ubi, new_fm->e[i], i, 0); 1644 new_fm->e[i] = NULL; 1645 } 1646 1647 ret = -ENOSPC; 1648 goto err; 1649 } 1650 new_fm->e[0] = tmp_e; 1651 } 1652 1653 ret = ubi_write_fastmap(ubi, new_fm); 1654 1655 if (ret) 1656 goto err; 1657 1658 out_unlock: 1659 up_write(&ubi->fm_eba_sem); 1660 up_write(&ubi->work_sem); 1661 up_write(&ubi->fm_protect); 1662 kfree(old_fm); 1663 return ret; 1664 1665 err: 1666 ubi_warn(ubi, "Unable to write new fastmap, err=%i", ret); 1667 1668 ret = invalidate_fastmap(ubi); 1669 if (ret < 0) { 1670 ubi_err(ubi, "Unable to invalidiate current fastmap!"); 1671 ubi_ro_mode(ubi); 1672 } else { 1673 return_fm_pebs(ubi, old_fm); 1674 return_fm_pebs(ubi, new_fm); 1675 ret = 0; 1676 } 1677 1678 kfree(new_fm); 1679 goto out_unlock; 1680 } 1681