drivers/mtd/ubi/scan.c

   1 /*
   2  * Copyright (c) International Business Machines Corp., 2006
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
  12  * the GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17  *
  18  * Author: Artem Bityutskiy (Битюцкий Артём)
  19  */
  20
  21 /*
  22  * UBI scanning sub-system.
  23  *
  24  * This sub-system is responsible for scanning the flash media, checking UBI
  25  * headers and providing complete information about the UBI flash image.
  26  *
  27  * The scanning information is represented by a &struct ubi_scan_info' object.
  28  * Information about found volumes is represented by &struct ubi_scan_volume
  29  * objects which are kept in volume RB-tree with root at the @volumes field.
  30  * The RB-tree is indexed by the volume ID.
  31  *
  32  * Found logical eraseblocks are represented by &struct ubi_scan_leb objects.
  33  * These objects are kept in per-volume RB-trees with the root at the
  34  * corresponding &struct ubi_scan_volume object. To put it differently, we keep
  35  * an RB-tree of per-volume objects and each of these objects is the root of
  36  * RB-tree of per-eraseblock objects.
  37  *
  38  * Corrupted physical eraseblocks are put to the @corr list, free physical
  39  * eraseblocks are put to the @free list and the physical eraseblock to be
  40  * erased are put to the @erase list.
  41  */
  42
  43 #include <linux/err.h>
  44 #include <linux/crc32.h>
  45 #include <linux/math64.h>
  46 #include "ubi.h"
  47
  48 #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
  49 static int paranoid_check_si(struct ubi_device *ubi, struct ubi_scan_info *si);
  50 #else
  51 #define paranoid_check_si(ubi, si) 0
  52 #endif
  53
  54 /* Temporary variables used during scanning */
  55 static struct ubi_ec_hdr *ech;
  56 static struct ubi_vid_hdr *vidh;
  57
  58 /**
  59  * add_to_list - add physical eraseblock to a list.
  60  * @si: scanning information
  61  * @pnum: physical eraseblock number to add
  62  * @ec: erase counter of the physical eraseblock
  63  * @list: the list to add to
  64  *
  65  * This function adds physical eraseblock @pnum to free, erase, corrupted or
  66  * alien lists. Returns zero in case of success and a negative error code in
  67  * case of failure.
  68  */
  69 static int add_to_list(struct ubi_scan_info *si, int pnum, int ec,
  70                        struct list_head *list)
  71 {
  72         struct ubi_scan_leb *seb;
  73
  74         if (list == &si->free)
  75                 dbg_bld("add to free: PEB %d, EC %d", pnum, ec);
  76         else if (list == &si->erase)
  77                 dbg_bld("add to erase: PEB %d, EC %d", pnum, ec);
  78         else if (list == &si->corr)
  79                 dbg_bld("add to corrupted: PEB %d, EC %d", pnum, ec);
  80         else if (list == &si->alien)
  81                 dbg_bld("add to alien: PEB %d, EC %d", pnum, ec);
  82         else
  83                 BUG();
  84
  85         seb = kmalloc(sizeof(struct ubi_scan_leb), GFP_KERNEL);
  86         if (!seb)
  87                 return -ENOMEM;
  88
  89         seb->pnum = pnum;
  90         seb->ec = ec;
  91         list_add_tail(&seb->u.list, list);
  92         return 0;
  93 }
  94
  95 /**
  96  * validate_vid_hdr - check volume identifier header.
  97  * @vid_hdr: the volume identifier header to check
  98  * @sv: information about the volume this logical eraseblock belongs to
  99  * @pnum: physical eraseblock number the VID header came from
 100  *
 101  * This function checks that data stored in @vid_hdr is consistent. Returns
 102  * non-zero if an inconsistency was found and zero if not.
 103  *
 104  * Note, UBI does sanity check of everything it reads from the flash media.
 105  * Most of the checks are done in the I/O sub-system. Here we check that the
 106  * information in the VID header is consistent to the information in other VID
 107  * headers of the same volume.
 108  */
 109 static int validate_vid_hdr(const struct ubi_vid_hdr *vid_hdr,
 110                             const struct ubi_scan_volume *sv, int pnum)
 111 {
 112         int vol_type = vid_hdr->vol_type;
 113         int vol_id = be32_to_cpu(vid_hdr->vol_id);
 114         int used_ebs = be32_to_cpu(vid_hdr->used_ebs);
 115         int data_pad = be32_to_cpu(vid_hdr->data_pad);
 116
 117         if (sv->leb_count != 0) {
 118                 int sv_vol_type;
 119
 120                 /*
 121                  * This is not the first logical eraseblock belonging to this
 122                  * volume. Ensure that the data in its VID header is consistent
 123                  * to the data in previous logical eraseblock headers.
 124                  */
 125
 126                 if (vol_id != sv->vol_id) {
 127                         dbg_err("inconsistent vol_id");
 128                         goto bad;
 129                 }
 130
 131                 if (sv->vol_type == UBI_STATIC_VOLUME)
 132                         sv_vol_type = UBI_VID_STATIC;
 133                 else
 134                         sv_vol_type = UBI_VID_DYNAMIC;
 135
 136                 if (vol_type != sv_vol_type) {
 137                         dbg_err("inconsistent vol_type");
 138                         goto bad;
 139                 }
 140
 141                 if (used_ebs != sv->used_ebs) {
 142                         dbg_err("inconsistent used_ebs");
 143                         goto bad;
 144                 }
 145
 146                 if (data_pad != sv->data_pad) {
 147                         dbg_err("inconsistent data_pad");
 148                         goto bad;
 149                 }
 150         }
 151
 152         return 0;
 153
 154 bad:
 155         ubi_err("inconsistent VID header at PEB %d", pnum);
 156         ubi_dbg_dump_vid_hdr(vid_hdr);
 157         ubi_dbg_dump_sv(sv);
 158         return -EINVAL;
 159 }
 160
 161 /**
 162  * add_volume - add volume to the scanning information.
 163  * @si: scanning information
 164  * @vol_id: ID of the volume to add
 165  * @pnum: physical eraseblock number
 166  * @vid_hdr: volume identifier header
 167  *
 168  * If the volume corresponding to the @vid_hdr logical eraseblock is already
 169  * present in the scanning information, this function does nothing. Otherwise
 170  * it adds corresponding volume to the scanning information. Returns a pointer
 171  * to the scanning volume object in case of success and a negative error code
 172  * in case of failure.
 173  */
 174 static struct ubi_scan_volume *add_volume(struct ubi_scan_info *si, int vol_id,
 175                                           int pnum,
 176                                           const struct ubi_vid_hdr *vid_hdr)
 177 {
 178         struct ubi_scan_volume *sv;
 179         struct rb_node **p = &si->volumes.rb_node, *parent = NULL;
 180
 181         ubi_assert(vol_id == be32_to_cpu(vid_hdr->vol_id));
 182
 183         /* Walk the volume RB-tree to look if this volume is already present */
 184         while (*p) {
 185                 parent = *p;
 186                 sv = rb_entry(parent, struct ubi_scan_volume, rb);
 187
 188                 if (vol_id == sv->vol_id)
 189                         return sv;
 190
 191                 if (vol_id > sv->vol_id)
 192                         p = &(*p)->rb_left;
 193                 else
 194                         p = &(*p)->rb_right;
 195         }
 196
 197         /* The volume is absent - add it */
 198         sv = kmalloc(sizeof(struct ubi_scan_volume), GFP_KERNEL);
 199         if (!sv)
 200                 return ERR_PTR(-ENOMEM);
 201
 202         sv->highest_lnum = sv->leb_count = 0;
 203         sv->vol_id = vol_id;
 204         sv->root = RB_ROOT;
 205         sv->used_ebs = be32_to_cpu(vid_hdr->used_ebs);
 206         sv->data_pad = be32_to_cpu(vid_hdr->data_pad);
 207         sv->compat = vid_hdr->compat;
 208         sv->vol_type = vid_hdr->vol_type == UBI_VID_DYNAMIC ? UBI_DYNAMIC_VOLUME
 209                                                             : UBI_STATIC_VOLUME;
 210         if (vol_id > si->highest_vol_id)
 211                 si->highest_vol_id = vol_id;
 212
 213         rb_link_node(&sv->rb, parent, p);
 214         rb_insert_color(&sv->rb, &si->volumes);
 215         si->vols_found += 1;
 216         dbg_bld("added volume %d", vol_id);
 217         return sv;
 218 }
 219
 220 /**
 221  * compare_lebs - find out which logical eraseblock is newer.
 222  * @ubi: UBI device description object
 223  * @seb: first logical eraseblock to compare
 224  * @pnum: physical eraseblock number of the second logical eraseblock to
 225  * compare
 226  * @vid_hdr: volume identifier header of the second logical eraseblock
 227  *
 228  * This function compares 2 copies of a LEB and informs which one is newer. In
 229  * case of success this function returns a positive value, in case of failure, a
 230  * negative error code is returned. The success return codes use the following
 231  * bits:
 232  *     o bit 0 is cleared: the first PEB (described by @seb) is newer then the
 233  *       second PEB (described by @pnum and @vid_hdr);
 234  *     o bit 0 is set: the second PEB is newer;
 235  *     o bit 1 is cleared: no bit-flips were detected in the newer LEB;
 236  *     o bit 1 is set: bit-flips were detected in the newer LEB;
 237  *     o bit 2 is cleared: the older LEB is not corrupted;
 238  *     o bit 2 is set: the older LEB is corrupted.
 239  */
 240 static int compare_lebs(struct ubi_device *ubi, const struct ubi_scan_leb *seb,
 241                         int pnum, const struct ubi_vid_hdr *vid_hdr)
 242 {
 243         void *buf;
 244         int len, err, second_is_newer, bitflips = 0, corrupted = 0;
 245         uint32_t data_crc, crc;
 246         struct ubi_vid_hdr *vh = NULL;
 247         unsigned long long sqnum2 = be64_to_cpu(vid_hdr->sqnum);
 248
 249         if (sqnum2 == seb->sqnum) {
 250                 /*
 251                  * This must be a really ancient UBI image which has been
 252                  * created before sequence numbers support has been added. At
 253                  * that times we used 32-bit LEB versions stored in logical
 254                  * eraseblocks. That was before UBI got into mainline. We do not
 255                  * support these images anymore. Well, those images will work
 256                  * still work, but only if no unclean reboots happened.
 257                  */
 258                 ubi_err("unsupported on-flash UBI format\n");
 259                 return -EINVAL;
 260         }
 261
 262         /* Obviously the LEB with lower sequence counter is older */
 263         second_is_newer = !!(sqnum2 > seb->sqnum);
 264
 265         /*
 266          * Now we know which copy is newer. If the copy flag of the PEB with
 267          * newer version is not set, then we just return, otherwise we have to
 268          * check data CRC. For the second PEB we already have the VID header,
 269          * for the first one - we'll need to re-read it from flash.
 270          *
 271          * Note: this may be optimized so that we wouldn't read twice.
 272          */
 273
 274         if (second_is_newer) {
 275                 if (!vid_hdr->copy_flag) {
 276                         /* It is not a copy, so it is newer */
 277                         dbg_bld("second PEB %d is newer, copy_flag is unset",
 278                                 pnum);
 279                         return 1;
 280                 }
 281         } else {
 282                 pnum = seb->pnum;
 283
 284                 vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
 285                 if (!vh)
 286                         return -ENOMEM;
 287
 288                 err = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
 289                 if (err) {
 290                         if (err == UBI_IO_BITFLIPS)
 291                                 bitflips = 1;
 292                         else {
 293                                 dbg_err("VID of PEB %d header is bad, but it "
 294                                         "was OK earlier", pnum);
 295                                 if (err > 0)
 296                                         err = -EIO;
 297
 298                                 goto out_free_vidh;
 299                         }
 300                 }
 301
 302                 if (!vh->copy_flag) {
 303                         /* It is not a copy, so it is newer */
 304                         dbg_bld("first PEB %d is newer, copy_flag is unset",
 305                                 pnum);
 306                         err = bitflips << 1;
 307                         goto out_free_vidh;
 308                 }
 309
 310                 vid_hdr = vh;
 311         }
 312
 313         /* Read the data of the copy and check the CRC */
 314
 315         len = be32_to_cpu(vid_hdr->data_size);
 316         buf = vmalloc(len);
 317         if (!buf) {
 318                 err = -ENOMEM;
 319                 goto out_free_vidh;
 320         }
 321
 322         err = ubi_io_read_data(ubi, buf, pnum, 0, len);
 323         if (err && err != UBI_IO_BITFLIPS && err != -EBADMSG)
 324                 goto out_free_buf;
 325
 326         data_crc = be32_to_cpu(vid_hdr->data_crc);
 327         crc = crc32(UBI_CRC32_INIT, buf, len);
 328         if (crc != data_crc) {
 329                 dbg_bld("PEB %d CRC error: calculated %#08x, must be %#08x",
 330                         pnum, crc, data_crc);
 331                 corrupted = 1;
 332                 bitflips = 0;
 333                 second_is_newer = !second_is_newer;
 334         } else {
 335                 dbg_bld("PEB %d CRC is OK", pnum);
 336                 bitflips = !!err;
 337         }
 338
 339         vfree(buf);
 340         ubi_free_vid_hdr(ubi, vh);
 341
 342         if (second_is_newer)
 343                 dbg_bld("second PEB %d is newer, copy_flag is set", pnum);
 344         else
 345                 dbg_bld("first PEB %d is newer, copy_flag is set", pnum);
 346
 347         return second_is_newer | (bitflips << 1) | (corrupted << 2);
 348
 349 out_free_buf:
 350         vfree(buf);
 351 out_free_vidh:
 352         ubi_free_vid_hdr(ubi, vh);
 353         return err;
 354 }
 355
 356 /**
 357  * ubi_scan_add_used - add physical eraseblock to the scanning information.
 358  * @ubi: UBI device description object
 359  * @si: scanning information
 360  * @pnum: the physical eraseblock number
 361  * @ec: erase counter
 362  * @vid_hdr: the volume identifier header
 363  * @bitflips: if bit-flips were detected when this physical eraseblock was read
 364  *
 365  * This function adds information about a used physical eraseblock to the
 366  * 'used' tree of the corresponding volume. The function is rather complex
 367  * because it has to handle cases when this is not the first physical
 368  * eraseblock belonging to the same logical eraseblock, and the newer one has
 369  * to be picked, while the older one has to be dropped. This function returns
 370  * zero in case of success and a negative error code in case of failure.
 371  */
 372 int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
 373                       int pnum, int ec, const struct ubi_vid_hdr *vid_hdr,
 374                       int bitflips)
 375 {
 376         int err, vol_id, lnum;
 377         unsigned long long sqnum;
 378         struct ubi_scan_volume *sv;
 379         struct ubi_scan_leb *seb;
 380         struct rb_node **p, *parent = NULL;
 381
 382         vol_id = be32_to_cpu(vid_hdr->vol_id);
 383         lnum = be32_to_cpu(vid_hdr->lnum);
 384         sqnum = be64_to_cpu(vid_hdr->sqnum);
 385
 386         dbg_bld("PEB %d, LEB %d:%d, EC %d, sqnum %llu, bitflips %d",
 387                 pnum, vol_id, lnum, ec, sqnum, bitflips);
 388
 389         sv = add_volume(si, vol_id, pnum, vid_hdr);
 390         if (IS_ERR(sv))
 391                 return PTR_ERR(sv);
 392
 393         if (si->max_sqnum < sqnum)
 394                 si->max_sqnum = sqnum;
 395
 396         /*
 397          * Walk the RB-tree of logical eraseblocks of volume @vol_id to look
 398          * if this is the first instance of this logical eraseblock or not.
 399          */
 400         p = &sv->root.rb_node;
 401         while (*p) {
 402                 int cmp_res;
 403
 404                 parent = *p;
 405                 seb = rb_entry(parent, struct ubi_scan_leb, u.rb);
 406                 if (lnum != seb->lnum) {
 407                         if (lnum < seb->lnum)
 408                                 p = &(*p)->rb_left;
 409                         else
 410                                 p = &(*p)->rb_right;
 411                         continue;
 412                 }
 413
 414                 /*
 415                  * There is already a physical eraseblock describing the same
 416                  * logical eraseblock present.
 417                  */
 418
 419                 dbg_bld("this LEB already exists: PEB %d, sqnum %llu, "
 420                         "EC %d", seb->pnum, seb->sqnum, seb->ec);
 421
 422                 /*
 423                  * Make sure that the logical eraseblocks have different
 424                  * sequence numbers. Otherwise the image is bad.
 425                  *
 426                  * However, if the sequence number is zero, we assume it must
 427                  * be an ancient UBI image from the era when UBI did not have
 428                  * sequence numbers. We still can attach these images, unless
 429                  * there is a need to distinguish between old and new
 430                  * eraseblocks, in which case we'll refuse the image in
 431                  * 'compare_lebs()'. In other words, we attach old clean
 432                  * images, but refuse attaching old images with duplicated
 433                  * logical eraseblocks because there was an unclean reboot.
 434                  */
 435                 if (seb->sqnum == sqnum && sqnum != 0) {
 436                         ubi_err("two LEBs with same sequence number %llu",
 437                                 sqnum);
 438                         ubi_dbg_dump_seb(seb, 0);
 439                         ubi_dbg_dump_vid_hdr(vid_hdr);
 440                         return -EINVAL;
 441                 }
 442
 443                 /*
 444                  * Now we have to drop the older one and preserve the newer
 445                  * one.
 446                  */
 447                 cmp_res = compare_lebs(ubi, seb, pnum, vid_hdr);
 448                 if (cmp_res < 0)
 449                         return cmp_res;
 450
 451                 if (cmp_res & 1) {
 452                         /*
 453                          * This logical eraseblock is newer then the one
 454                          * found earlier.
 455                          */
 456                         err = validate_vid_hdr(vid_hdr, sv, pnum);
 457                         if (err)
 458                                 return err;
 459
 460                         if (cmp_res & 4)
 461                                 err = add_to_list(si, seb->pnum, seb->ec,
 462                                                   &si->corr);
 463                         else
 464                                 err = add_to_list(si, seb->pnum, seb->ec,
 465                                                   &si->erase);
 466                         if (err)
 467                                 return err;
 468
 469                         seb->ec = ec;
 470                         seb->pnum = pnum;
 471                         seb->scrub = ((cmp_res & 2) || bitflips);
 472                         seb->sqnum = sqnum;
 473
 474                         if (sv->highest_lnum == lnum)
 475                                 sv->last_data_size =
 476                                         be32_to_cpu(vid_hdr->data_size);
 477
 478                         return 0;
 479                 } else {
 480                         /*
 481                          * This logical eraseblock is older than the one found
 482                          * previously.
 483                          */
 484                         if (cmp_res & 4)
 485                                 return add_to_list(si, pnum, ec, &si->corr);
 486                         else
 487                                 return add_to_list(si, pnum, ec, &si->erase);
 488                 }
 489         }
 490
 491         /*
 492          * We've met this logical eraseblock for the first time, add it to the
 493          * scanning information.
 494          */
 495
 496         err = validate_vid_hdr(vid_hdr, sv, pnum);
 497         if (err)
 498                 return err;
 499
 500         seb = kmalloc(sizeof(struct ubi_scan_leb), GFP_KERNEL);
 501         if (!seb)
 502                 return -ENOMEM;
 503
 504         seb->ec = ec;
 505         seb->pnum = pnum;
 506         seb->lnum = lnum;
 507         seb->sqnum = sqnum;
 508         seb->scrub = bitflips;
 509
 510         if (sv->highest_lnum <= lnum) {
 511                 sv->highest_lnum = lnum;
 512                 sv->last_data_size = be32_to_cpu(vid_hdr->data_size);
 513         }
 514
 515         sv->leb_count += 1;
 516         rb_link_node(&seb->u.rb, parent, p);
 517         rb_insert_color(&seb->u.rb, &sv->root);
 518         return 0;
 519 }
 520
 521 /**
 522  * ubi_scan_find_sv - find volume in the scanning information.
 523  * @si: scanning information
 524  * @vol_id: the requested volume ID
 525  *
 526  * This function returns a pointer to the volume description or %NULL if there
 527  * are no data about this volume in the scanning information.
 528  */
 529 struct ubi_scan_volume *ubi_scan_find_sv(const struct ubi_scan_info *si,
 530                                          int vol_id)
 531 {
 532         struct ubi_scan_volume *sv;
 533         struct rb_node *p = si->volumes.rb_node;
 534
 535         while (p) {
 536                 sv = rb_entry(p, struct ubi_scan_volume, rb);
 537
 538                 if (vol_id == sv->vol_id)
 539                         return sv;
 540
 541                 if (vol_id > sv->vol_id)
 542                         p = p->rb_left;
 543                 else
 544                         p = p->rb_right;
 545         }
 546
 547         return NULL;
 548 }
 549
 550 /**
 551  * ubi_scan_find_seb - find LEB in the volume scanning information.
 552  * @sv: a pointer to the volume scanning information
 553  * @lnum: the requested logical eraseblock
 554  *
 555  * This function returns a pointer to the scanning logical eraseblock or %NULL
 556  * if there are no data about it in the scanning volume information.
 557  */
 558 struct ubi_scan_leb *ubi_scan_find_seb(const struct ubi_scan_volume *sv,
 559                                        int lnum)
 560 {
 561         struct ubi_scan_leb *seb;
 562         struct rb_node *p = sv->root.rb_node;
 563
 564         while (p) {
 565                 seb = rb_entry(p, struct ubi_scan_leb, u.rb);
 566
 567                 if (lnum == seb->lnum)
 568                         return seb;
 569
 570                 if (lnum > seb->lnum)
 571                         p = p->rb_left;
 572                 else
 573                         p = p->rb_right;
 574         }
 575
 576         return NULL;
 577 }
 578
 579 /**
 580  * ubi_scan_rm_volume - delete scanning information about a volume.
 581  * @si: scanning information
 582  * @sv: the volume scanning information to delete
 583  */
 584 void ubi_scan_rm_volume(struct ubi_scan_info *si, struct ubi_scan_volume *sv)
 585 {
 586         struct rb_node *rb;
 587         struct ubi_scan_leb *seb;
 588
 589         dbg_bld("remove scanning information about volume %d", sv->vol_id);
 590
 591         while ((rb = rb_first(&sv->root))) {
 592                 seb = rb_entry(rb, struct ubi_scan_leb, u.rb);
 593                 rb_erase(&seb->u.rb, &sv->root);
 594                 list_add_tail(&seb->u.list, &si->erase);
 595         }
 596
 597         rb_erase(&sv->rb, &si->volumes);
 598         kfree(sv);
 599         si->vols_found -= 1;
 600 }
 601
 602 /**
 603  * ubi_scan_erase_peb - erase a physical eraseblock.
 604  * @ubi: UBI device description object
 605  * @si: scanning information
 606  * @pnum: physical eraseblock number to erase;
 607  * @ec: erase counter value to write (%UBI_SCAN_UNKNOWN_EC if it is unknown)
 608  *
 609  * This function erases physical eraseblock 'pnum', and writes the erase
 610  * counter header to it. This function should only be used on UBI device
 611  * initialization stages, when the EBA sub-system had not been yet initialized.
 612  * This function returns zero in case of success and a negative error code in
 613  * case of failure.
 614  */
 615 int ubi_scan_erase_peb(struct ubi_device *ubi, const struct ubi_scan_info *si,
 616                        int pnum, int ec)
 617 {
 618         int err;
 619         struct ubi_ec_hdr *ec_hdr;
 620
 621         if ((long long)ec >= UBI_MAX_ERASECOUNTER) {
 622                 /*
 623                  * Erase counter overflow. Upgrade UBI and use 64-bit
 624                  * erase counters internally.
 625                  */
 626                 ubi_err("erase counter overflow at PEB %d, EC %d", pnum, ec);
 627                 return -EINVAL;
 628         }
 629
 630         ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
 631         if (!ec_hdr)
 632                 return -ENOMEM;
 633
 634         ec_hdr->ec = cpu_to_be64(ec);
 635
 636         err = ubi_io_sync_erase(ubi, pnum, 0);
 637         if (err < 0)
 638                 goto out_free;
 639
 640         err = ubi_io_write_ec_hdr(ubi, pnum, ec_hdr);
 641
 642 out_free:
 643         kfree(ec_hdr);
 644         return err;
 645 }
 646
 647 /**
 648  * ubi_scan_get_free_peb - get a free physical eraseblock.
 649  * @ubi: UBI device description object
 650  * @si: scanning information
 651  *
 652  * This function returns a free physical eraseblock. It is supposed to be
 653  * called on the UBI initialization stages when the wear-leveling sub-system is
 654  * not initialized yet. This function picks a physical eraseblocks from one of
 655  * the lists, writes the EC header if it is needed, and removes it from the
 656  * list.
 657  *
 658  * This function returns scanning physical eraseblock information in case of
 659  * success and an error code in case of failure.
 660  */
 661 struct ubi_scan_leb *ubi_scan_get_free_peb(struct ubi_device *ubi,
 662                                            struct ubi_scan_info *si)
 663 {
 664         int err = 0, i;
 665         struct ubi_scan_leb *seb;
 666
 667         if (!list_empty(&si->free)) {
 668                 seb = list_entry(si->free.next, struct ubi_scan_leb, u.list);
 669                 list_del(&seb->u.list);
 670                 dbg_bld("return free PEB %d, EC %d", seb->pnum, seb->ec);
 671                 return seb;
 672         }
 673
 674         for (i = 0; i < 2; i++) {
 675                 struct list_head *head;
 676                 struct ubi_scan_leb *tmp_seb;
 677
 678                 if (i == 0)
 679                         head = &si->erase;
 680                 else
 681                         head = &si->corr;
 682
 683                 /*
 684                  * We try to erase the first physical eraseblock from the @head
 685                  * list and pick it if we succeed, or try to erase the
 686                  * next one if not. And so forth. We don't want to take care
 687                  * about bad eraseblocks here - they'll be handled later.
 688                  */
 689                 list_for_each_entry_safe(seb, tmp_seb, head, u.list) {
 690                         if (seb->ec == UBI_SCAN_UNKNOWN_EC)
 691                                 seb->ec = si->mean_ec;
 692
 693                         err = ubi_scan_erase_peb(ubi, si, seb->pnum, seb->ec+1);
 694                         if (err)
 695                                 continue;
 696
 697                         seb->ec += 1;
 698                         list_del(&seb->u.list);
 699                         dbg_bld("return PEB %d, EC %d", seb->pnum, seb->ec);
 700                         return seb;
 701                 }
 702         }
 703
 704         ubi_err("no eraseblocks found");
 705         return ERR_PTR(-ENOSPC);
 706 }
 707
 708 /**
 709  * process_eb - read, check UBI headers, and add them to scanning information.
 710  * @ubi: UBI device description object
 711  * @si: scanning information
 712  * @pnum: the physical eraseblock number
 713  *
 714  * This function returns a zero if the physical eraseblock was successfully
 715  * handled and a negative error code in case of failure.
 716  */
 717 static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
 718                       int pnum)
 719 {
 720         long long uninitialized_var(ec);
 721         int err, bitflips = 0, vol_id, ec_corr = 0;
 722
 723         dbg_bld("scan PEB %d", pnum);
 724
 725         /* Skip bad physical eraseblocks */
 726         err = ubi_io_is_bad(ubi, pnum);
 727         if (err < 0)
 728                 return err;
 729         else if (err) {
 730                 /*
 731                  * FIXME: this is actually duty of the I/O sub-system to
 732                  * initialize this, but MTD does not provide enough
 733                  * information.
 734                  */
 735                 si->bad_peb_count += 1;
 736                 return 0;
 737         }
 738
 739         err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
 740         if (err < 0)
 741                 return err;
 742         else if (err == UBI_IO_BITFLIPS)
 743                 bitflips = 1;
 744         else if (err == UBI_IO_PEB_EMPTY)
 745                 return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, &si->erase);
 746         else if (err == UBI_IO_BAD_EC_HDR) {
 747                 /*
 748                  * We have to also look at the VID header, possibly it is not
 749                  * corrupted. Set %bitflips flag in order to make this PEB be
 750                  * moved and EC be re-created.
 751                  */
 752                 ec_corr = 1;
 753                 ec = UBI_SCAN_UNKNOWN_EC;
 754                 bitflips = 1;
 755         }
 756
 757         si->is_empty = 0;
 758
 759         if (!ec_corr) {
 760                 int image_seq;
 761
 762                 /* Make sure UBI version is OK */
 763                 if (ech->version != UBI_VERSION) {
 764                         ubi_err("this UBI version is %d, image version is %d",
 765                                 UBI_VERSION, (int)ech->version);
 766                         return -EINVAL;
 767                 }
 768
 769                 ec = be64_to_cpu(ech->ec);
 770                 if (ec > UBI_MAX_ERASECOUNTER) {
 771                         /*
 772                          * Erase counter overflow. The EC headers have 64 bits
 773                          * reserved, but we anyway make use of only 31 bit
 774                          * values, as this seems to be enough for any existing
 775                          * flash. Upgrade UBI and use 64-bit erase counters
 776                          * internally.
 777                          */
 778                         ubi_err("erase counter overflow, max is %d",
 779                                 UBI_MAX_ERASECOUNTER);
 780                         ubi_dbg_dump_ec_hdr(ech);
 781                         return -EINVAL;
 782                 }
 783
 784                 image_seq = be32_to_cpu(ech->image_seq);
 785                 if (!si->image_seq_set) {
 786                         ubi->image_seq = image_seq;
 787                         si->image_seq_set = 1;
 788                 } else if (ubi->image_seq != image_seq) {
 789                         ubi_err("bad image sequence number %d in PEB %d, "
 790                                 "expected %d", image_seq, pnum, ubi->image_seq);
 791                         ubi_dbg_dump_ec_hdr(ech);
 792                         return -EINVAL;
 793                 }
 794
 795         }
 796
 797         /* OK, we've done with the EC header, let's look at the VID header */
 798
 799         err = ubi_io_read_vid_hdr(ubi, pnum, vidh, 0);
 800         if (err < 0)
 801                 return err;
 802         else if (err == UBI_IO_BITFLIPS)
 803                 bitflips = 1;
 804         else if (err == UBI_IO_BAD_VID_HDR ||
 805                  (err == UBI_IO_PEB_FREE && ec_corr)) {
 806                 /* VID header is corrupted */
 807                 err = add_to_list(si, pnum, ec, &si->corr);
 808                 if (err)
 809                         return err;
 810                 goto adjust_mean_ec;
 811         } else if (err == UBI_IO_PEB_FREE) {
 812                 /* No VID header - the physical eraseblock is free */
 813                 err = add_to_list(si, pnum, ec, &si->free);
 814                 if (err)
 815                         return err;
 816                 goto adjust_mean_ec;
 817         }
 818
 819         vol_id = be32_to_cpu(vidh->vol_id);
 820         if (vol_id > UBI_MAX_VOLUMES && vol_id != UBI_LAYOUT_VOLUME_ID) {
 821                 int lnum = be32_to_cpu(vidh->lnum);
 822
 823                 /* Unsupported internal volume */
 824                 switch (vidh->compat) {
 825                 case UBI_COMPAT_DELETE:
 826                         ubi_msg("\"delete\" compatible internal volume %d:%d"
 827                                 " found, remove it", vol_id, lnum);
 828                         err = add_to_list(si, pnum, ec, &si->corr);
 829                         if (err)
 830                                 return err;
 831                         break;
 832
 833                 case UBI_COMPAT_RO:
 834                         ubi_msg("read-only compatible internal volume %d:%d"
 835                                 " found, switch to read-only mode",
 836                                 vol_id, lnum);
 837                         ubi->ro_mode = 1;
 838                         break;
 839
 840                 case UBI_COMPAT_PRESERVE:
 841                         ubi_msg("\"preserve\" compatible internal volume %d:%d"
 842                                 " found", vol_id, lnum);
 843                         err = add_to_list(si, pnum, ec, &si->alien);
 844                         if (err)
 845                                 return err;
 846                         si->alien_peb_count += 1;
 847                         return 0;
 848
 849                 case UBI_COMPAT_REJECT:
 850                         ubi_err("incompatible internal volume %d:%d found",
 851                                 vol_id, lnum);
 852                         return -EINVAL;
 853                 }
 854         }
 855
 856         /* Both UBI headers seem to be fine */
 857         err = ubi_scan_add_used(ubi, si, pnum, ec, vidh, bitflips);
 858         if (err)
 859                 return err;
 860
 861 adjust_mean_ec:
 862         if (!ec_corr) {
 863                 si->ec_sum += ec;
 864                 si->ec_count += 1;
 865                 if (ec > si->max_ec)
 866                         si->max_ec = ec;
 867                 if (ec < si->min_ec)
 868                         si->min_ec = ec;
 869         }
 870
 871         return 0;
 872 }
 873
 874 /**
 875  * ubi_scan - scan an MTD device.
 876  * @ubi: UBI device description object
 877  *
 878  * This function does full scanning of an MTD device and returns complete
 879  * information about it. In case of failure, an error code is returned.
 880  */
 881 struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
 882 {
 883         int err, pnum;
 884         struct rb_node *rb1, *rb2;
 885         struct ubi_scan_volume *sv;
 886         struct ubi_scan_leb *seb;
 887         struct ubi_scan_info *si;
 888
 889         si = kzalloc(sizeof(struct ubi_scan_info), GFP_KERNEL);
 890         if (!si)
 891                 return ERR_PTR(-ENOMEM);
 892
 893         INIT_LIST_HEAD(&si->corr);
 894         INIT_LIST_HEAD(&si->free);
 895         INIT_LIST_HEAD(&si->erase);
 896         INIT_LIST_HEAD(&si->alien);
 897         si->volumes = RB_ROOT;
 898         si->is_empty = 1;
 899
 900         err = -ENOMEM;
 901         ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
 902         if (!ech)
 903                 goto out_si;
 904
 905         vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
 906         if (!vidh)
 907                 goto out_ech;
 908
 909         for (pnum = 0; pnum < ubi->peb_count; pnum++) {
 910                 cond_resched();
 911
 912                 dbg_gen("process PEB %d", pnum);
 913                 err = process_eb(ubi, si, pnum);
 914                 if (err < 0)
 915                         goto out_vidh;
 916         }
 917
 918         dbg_msg("scanning is finished");
 919
 920         /* Calculate mean erase counter */
 921         if (si->ec_count)
 922                 si->mean_ec = div_u64(si->ec_sum, si->ec_count);
 923
 924         if (si->is_empty)
 925                 ubi_msg("empty MTD device detected");
 926
 927         /*
 928          * In case of unknown erase counter we use the mean erase counter
 929          * value.
 930          */
 931         ubi_rb_for_each_entry(rb1, sv, &si->volumes, rb) {
 932                 ubi_rb_for_each_entry(rb2, seb, &sv->root, u.rb)
 933                         if (seb->ec == UBI_SCAN_UNKNOWN_EC)
 934                                 seb->ec = si->mean_ec;
 935         }
 936
 937         list_for_each_entry(seb, &si->free, u.list) {
 938                 if (seb->ec == UBI_SCAN_UNKNOWN_EC)
 939                         seb->ec = si->mean_ec;
 940         }
 941
 942         list_for_each_entry(seb, &si->corr, u.list)
 943                 if (seb->ec == UBI_SCAN_UNKNOWN_EC)
 944                         seb->ec = si->mean_ec;
 945
 946         list_for_each_entry(seb, &si->erase, u.list)
 947                 if (seb->ec == UBI_SCAN_UNKNOWN_EC)
 948                         seb->ec = si->mean_ec;
 949
 950         err = paranoid_check_si(ubi, si);
 951         if (err) {
 952                 if (err > 0)
 953                         err = -EINVAL;
 954                 goto out_vidh;
 955         }
 956
 957         ubi_free_vid_hdr(ubi, vidh);
 958         kfree(ech);
 959
 960         return si;
 961
 962 out_vidh:
 963         ubi_free_vid_hdr(ubi, vidh);
 964 out_ech:
 965         kfree(ech);
 966 out_si:
 967         ubi_scan_destroy_si(si);
 968         return ERR_PTR(err);
 969 }
 970
 971 /**
 972  * destroy_sv - free the scanning volume information
 973  * @sv: scanning volume information
 974  *
 975  * This function destroys the volume RB-tree (@sv->root) and the scanning
 976  * volume information.
 977  */
 978 static void destroy_sv(struct ubi_scan_volume *sv)
 979 {
 980         struct ubi_scan_leb *seb;
 981         struct rb_node *this = sv->root.rb_node;
 982
 983         while (this) {
 984                 if (this->rb_left)
 985                         this = this->rb_left;
 986                 else if (this->rb_right)
 987                         this = this->rb_right;
 988                 else {
 989                         seb = rb_entry(this, struct ubi_scan_leb, u.rb);
 990                         this = rb_parent(this);
 991                         if (this) {
 992                                 if (this->rb_left == &seb->u.rb)
 993                                         this->rb_left = NULL;
 994                                 else
 995                                         this->rb_right = NULL;
 996                         }
 997
 998                         kfree(seb);
 999                 }
1000         }
1001         kfree(sv);
1002 }
1003
1004 /**
1005  * ubi_scan_destroy_si - destroy scanning information.
1006  * @si: scanning information
1007  */
1008 void ubi_scan_destroy_si(struct ubi_scan_info *si)
1009 {
1010         struct ubi_scan_leb *seb, *seb_tmp;
1011         struct ubi_scan_volume *sv;
1012         struct rb_node *rb;
1013
1014         list_for_each_entry_safe(seb, seb_tmp, &si->alien, u.list) {
1015                 list_del(&seb->u.list);
1016                 kfree(seb);
1017         }
1018         list_for_each_entry_safe(seb, seb_tmp, &si->erase, u.list) {
1019                 list_del(&seb->u.list);
1020                 kfree(seb);
1021         }
1022         list_for_each_entry_safe(seb, seb_tmp, &si->corr, u.list) {
1023                 list_del(&seb->u.list);
1024                 kfree(seb);
1025         }
1026         list_for_each_entry_safe(seb, seb_tmp, &si->free, u.list) {
1027                 list_del(&seb->u.list);
1028                 kfree(seb);
1029         }
1030
1031         /* Destroy the volume RB-tree */
1032         rb = si->volumes.rb_node;
1033         while (rb) {
1034                 if (rb->rb_left)
1035                         rb = rb->rb_left;
1036                 else if (rb->rb_right)
1037                         rb = rb->rb_right;
1038                 else {
1039                         sv = rb_entry(rb, struct ubi_scan_volume, rb);
1040
1041                         rb = rb_parent(rb);
1042                         if (rb) {
1043                                 if (rb->rb_left == &sv->rb)
1044                                         rb->rb_left = NULL;
1045                                 else
1046                                         rb->rb_right = NULL;
1047                         }
1048
1049                         destroy_sv(sv);
1050                 }
1051         }
1052
1053         kfree(si);
1054 }
1055
1056 #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
1057
1058 /**
1059  * paranoid_check_si - check the scanning information.
1060  * @ubi: UBI device description object
1061  * @si: scanning information
1062  *
1063  * This function returns zero if the scanning information is all right, %1 if
1064  * not and a negative error code if an error occurred.
1065  */
1066 static int paranoid_check_si(struct ubi_device *ubi, struct ubi_scan_info *si)
1067 {
1068         int pnum, err, vols_found = 0;
1069         struct rb_node *rb1, *rb2;
1070         struct ubi_scan_volume *sv;
1071         struct ubi_scan_leb *seb, *last_seb;
1072         uint8_t *buf;
1073
1074         /*
1075          * At first, check that scanning information is OK.
1076          */
1077         ubi_rb_for_each_entry(rb1, sv, &si->volumes, rb) {
1078                 int leb_count = 0;
1079
1080                 cond_resched();
1081
1082                 vols_found += 1;
1083
1084                 if (si->is_empty) {
1085                         ubi_err("bad is_empty flag");
1086                         goto bad_sv;
1087                 }
1088
1089                 if (sv->vol_id < 0 || sv->highest_lnum < 0 ||
1090                     sv->leb_count < 0 || sv->vol_type < 0 || sv->used_ebs < 0 ||
1091                     sv->data_pad < 0 || sv->last_data_size < 0) {
1092                         ubi_err("negative values");
1093                         goto bad_sv;
1094                 }
1095
1096                 if (sv->vol_id >= UBI_MAX_VOLUMES &&
1097                     sv->vol_id < UBI_INTERNAL_VOL_START) {
1098                         ubi_err("bad vol_id");
1099                         goto bad_sv;
1100                 }
1101
1102                 if (sv->vol_id > si->highest_vol_id) {
1103                         ubi_err("highest_vol_id is %d, but vol_id %d is there",
1104                                 si->highest_vol_id, sv->vol_id);
1105                         goto out;
1106                 }
1107
1108                 if (sv->vol_type != UBI_DYNAMIC_VOLUME &&
1109                     sv->vol_type != UBI_STATIC_VOLUME) {
1110                         ubi_err("bad vol_type");
1111                         goto bad_sv;
1112                 }
1113
1114                 if (sv->data_pad > ubi->leb_size / 2) {
1115                         ubi_err("bad data_pad");
1116                         goto bad_sv;
1117                 }
1118
1119                 last_seb = NULL;
1120                 ubi_rb_for_each_entry(rb2, seb, &sv->root, u.rb) {
1121                         cond_resched();
1122
1123                         last_seb = seb;
1124                         leb_count += 1;
1125
1126                         if (seb->pnum < 0 || seb->ec < 0) {
1127                                 ubi_err("negative values");
1128                                 goto bad_seb;
1129                         }
1130
1131                         if (seb->ec < si->min_ec) {
1132                                 ubi_err("bad si->min_ec (%d), %d found",
1133                                         si->min_ec, seb->ec);
1134                                 goto bad_seb;
1135                         }
1136
1137                         if (seb->ec > si->max_ec) {
1138                                 ubi_err("bad si->max_ec (%d), %d found",
1139                                         si->max_ec, seb->ec);
1140                                 goto bad_seb;
1141                         }
1142
1143                         if (seb->pnum >= ubi->peb_count) {
1144                                 ubi_err("too high PEB number %d, total PEBs %d",
1145                                         seb->pnum, ubi->peb_count);
1146                                 goto bad_seb;
1147                         }
1148
1149                         if (sv->vol_type == UBI_STATIC_VOLUME) {
1150                                 if (seb->lnum >= sv->used_ebs) {
1151                                         ubi_err("bad lnum or used_ebs");
1152                                         goto bad_seb;
1153                                 }
1154                         } else {
1155                                 if (sv->used_ebs != 0) {
1156                                         ubi_err("non-zero used_ebs");
1157                                         goto bad_seb;
1158                                 }
1159                         }
1160
1161                         if (seb->lnum > sv->highest_lnum) {
1162                                 ubi_err("incorrect highest_lnum or lnum");
1163                                 goto bad_seb;
1164                         }
1165                 }
1166
1167                 if (sv->leb_count != leb_count) {
1168                         ubi_err("bad leb_count, %d objects in the tree",
1169                                 leb_count);
1170                         goto bad_sv;
1171                 }
1172
1173                 if (!last_seb)
1174                         continue;
1175
1176                 seb = last_seb;
1177
1178                 if (seb->lnum != sv->highest_lnum) {
1179                         ubi_err("bad highest_lnum");
1180                         goto bad_seb;
1181                 }
1182         }
1183
1184         if (vols_found != si->vols_found) {
1185                 ubi_err("bad si->vols_found %d, should be %d",
1186                         si->vols_found, vols_found);
1187                 goto out;
1188         }
1189
1190         /* Check that scanning information is correct */
1191         ubi_rb_for_each_entry(rb1, sv, &si->volumes, rb) {
1192                 last_seb = NULL;
1193                 ubi_rb_for_each_entry(rb2, seb, &sv->root, u.rb) {
1194                         int vol_type;
1195
1196                         cond_resched();
1197
1198                         last_seb = seb;
1199
1200                         err = ubi_io_read_vid_hdr(ubi, seb->pnum, vidh, 1);
1201                         if (err && err != UBI_IO_BITFLIPS) {
1202                                 ubi_err("VID header is not OK (%d)", err);
1203                                 if (err > 0)
1204                                         err = -EIO;
1205                                 return err;
1206                         }
1207
1208                         vol_type = vidh->vol_type == UBI_VID_DYNAMIC ?
1209                                    UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME;
1210                         if (sv->vol_type != vol_type) {
1211                                 ubi_err("bad vol_type");
1212                                 goto bad_vid_hdr;
1213                         }
1214
1215                         if (seb->sqnum != be64_to_cpu(vidh->sqnum)) {
1216                                 ubi_err("bad sqnum %llu", seb->sqnum);
1217                                 goto bad_vid_hdr;
1218                         }
1219
1220                         if (sv->vol_id != be32_to_cpu(vidh->vol_id)) {
1221                                 ubi_err("bad vol_id %d", sv->vol_id);
1222                                 goto bad_vid_hdr;
1223                         }
1224
1225                         if (sv->compat != vidh->compat) {
1226                                 ubi_err("bad compat %d", vidh->compat);
1227                                 goto bad_vid_hdr;
1228                         }
1229
1230                         if (seb->lnum != be32_to_cpu(vidh->lnum)) {
1231                                 ubi_err("bad lnum %d", seb->lnum);
1232                                 goto bad_vid_hdr;
1233                         }
1234
1235                         if (sv->used_ebs != be32_to_cpu(vidh->used_ebs)) {
1236                                 ubi_err("bad used_ebs %d", sv->used_ebs);
1237                                 goto bad_vid_hdr;
1238                         }
1239
1240                         if (sv->data_pad != be32_to_cpu(vidh->data_pad)) {
1241                                 ubi_err("bad data_pad %d", sv->data_pad);
1242                                 goto bad_vid_hdr;
1243                         }
1244                 }
1245
1246                 if (!last_seb)
1247                         continue;
1248
1249                 if (sv->highest_lnum != be32_to_cpu(vidh->lnum)) {
1250                         ubi_err("bad highest_lnum %d", sv->highest_lnum);
1251                         goto bad_vid_hdr;
1252                 }
1253
1254                 if (sv->last_data_size != be32_to_cpu(vidh->data_size)) {
1255                         ubi_err("bad last_data_size %d", sv->last_data_size);
1256                         goto bad_vid_hdr;
1257                 }
1258         }
1259
1260         /*
1261          * Make sure that all the physical eraseblocks are in one of the lists
1262          * or trees.
1263          */
1264         buf = kzalloc(ubi->peb_count, GFP_KERNEL);
1265         if (!buf)
1266                 return -ENOMEM;
1267
1268         for (pnum = 0; pnum < ubi->peb_count; pnum++) {
1269                 err = ubi_io_is_bad(ubi, pnum);
1270                 if (err < 0) {
1271                         kfree(buf);
1272                         return err;
1273                 } else if (err)
1274                         buf[pnum] = 1;
1275         }
1276
1277         ubi_rb_for_each_entry(rb1, sv, &si->volumes, rb)
1278                 ubi_rb_for_each_entry(rb2, seb, &sv->root, u.rb)
1279                         buf[seb->pnum] = 1;
1280
1281         list_for_each_entry(seb, &si->free, u.list)
1282                 buf[seb->pnum] = 1;
1283
1284         list_for_each_entry(seb, &si->corr, u.list)
1285                 buf[seb->pnum] = 1;
1286
1287         list_for_each_entry(seb, &si->erase, u.list)
1288                 buf[seb->pnum] = 1;
1289
1290         list_for_each_entry(seb, &si->alien, u.list)
1291                 buf[seb->pnum] = 1;
1292
1293         err = 0;
1294         for (pnum = 0; pnum < ubi->peb_count; pnum++)
1295                 if (!buf[pnum]) {
1296                         ubi_err("PEB %d is not referred", pnum);
1297                         err = 1;
1298                 }
1299
1300         kfree(buf);
1301         if (err)
1302                 goto out;
1303         return 0;
1304
1305 bad_seb:
1306         ubi_err("bad scanning information about LEB %d", seb->lnum);
1307         ubi_dbg_dump_seb(seb, 0);
1308         ubi_dbg_dump_sv(sv);
1309         goto out;
1310
1311 bad_sv:
1312         ubi_err("bad scanning information about volume %d", sv->vol_id);
1313         ubi_dbg_dump_sv(sv);
1314         goto out;
1315
1316 bad_vid_hdr:
1317         ubi_err("bad scanning information about volume %d", sv->vol_id);
1318         ubi_dbg_dump_sv(sv);
1319         ubi_dbg_dump_vid_hdr(vidh);
1320
1321 out:
1322         ubi_dbg_dump_stack();
1323         return 1;
1324 }
1325
1326 #endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */