drivers/mtd/ubi/kapi.c

   1 /*
   2  * Copyright (c) International Business Machines Corp., 2006
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  *
   6  * Author: Artem Bityutskiy (Битюцкий Артём)
   7  */
   8
   9 /* This file mostly implements UBI kernel API functions */
  10
  11 #ifdef UBI_LINUX
  12 #include <linux/module.h>
  13 #include <linux/err.h>
  14 #include <asm/div64.h>
  15 #endif
  16
  17 #include <ubi_uboot.h>
  18 #include "ubi.h"
  19
  20 /**
  21  * ubi_get_device_info - get information about UBI device.
  22  * @ubi_num: UBI device number
  23  * @di: the information is stored here
  24  *
  25  * This function returns %0 in case of success, %-EINVAL if the UBI device
  26  * number is invalid, and %-ENODEV if there is no such UBI device.
  27  */
  28 int ubi_get_device_info(int ubi_num, struct ubi_device_info *di)
  29 {
  30         struct ubi_device *ubi;
  31
  32         if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
  33                 return -EINVAL;
  34
  35         ubi = ubi_get_device(ubi_num);
  36         if (!ubi)
  37                 return -ENODEV;
  38
  39         di->ubi_num = ubi->ubi_num;
  40         di->leb_size = ubi->leb_size;
  41         di->min_io_size = ubi->min_io_size;
  42         di->ro_mode = ubi->ro_mode;
  43         di->cdev = ubi->cdev.dev;
  44
  45         ubi_put_device(ubi);
  46         return 0;
  47 }
  48 EXPORT_SYMBOL_GPL(ubi_get_device_info);
  49
  50 /**
  51  * ubi_get_volume_info - get information about UBI volume.
  52  * @desc: volume descriptor
  53  * @vi: the information is stored here
  54  */
  55 void ubi_get_volume_info(struct ubi_volume_desc *desc,
  56                          struct ubi_volume_info *vi)
  57 {
  58         const struct ubi_volume *vol = desc->vol;
  59         const struct ubi_device *ubi = vol->ubi;
  60
  61         vi->vol_id = vol->vol_id;
  62         vi->ubi_num = ubi->ubi_num;
  63         vi->size = vol->reserved_pebs;
  64         vi->used_bytes = vol->used_bytes;
  65         vi->vol_type = vol->vol_type;
  66         vi->corrupted = vol->corrupted;
  67         vi->upd_marker = vol->upd_marker;
  68         vi->alignment = vol->alignment;
  69         vi->usable_leb_size = vol->usable_leb_size;
  70         vi->name_len = vol->name_len;
  71         vi->name = vol->name;
  72         vi->cdev = vol->cdev.dev;
  73 }
  74 EXPORT_SYMBOL_GPL(ubi_get_volume_info);
  75
  76 /**
  77  * ubi_open_volume - open UBI volume.
  78  * @ubi_num: UBI device number
  79  * @vol_id: volume ID
  80  * @mode: open mode
  81  *
  82  * The @mode parameter specifies if the volume should be opened in read-only
  83  * mode, read-write mode, or exclusive mode. The exclusive mode guarantees that
  84  * nobody else will be able to open this volume. UBI allows to have many volume
  85  * readers and one writer at a time.
  86  *
  87  * If a static volume is being opened for the first time since boot, it will be
  88  * checked by this function, which means it will be fully read and the CRC
  89  * checksum of each logical eraseblock will be checked.
  90  *
  91  * This function returns volume descriptor in case of success and a negative
  92  * error code in case of failure.
  93  */
  94 struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
  95 {
  96         int err;
  97         struct ubi_volume_desc *desc;
  98         struct ubi_device *ubi;
  99         struct ubi_volume *vol;
 100
 101         dbg_msg("open device %d volume %d, mode %d", ubi_num, vol_id, mode);
 102
 103         if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
 104                 return ERR_PTR(-EINVAL);
 105
 106         if (mode != UBI_READONLY && mode != UBI_READWRITE &&
 107             mode != UBI_EXCLUSIVE)
 108                 return ERR_PTR(-EINVAL);
 109
 110         /*
 111          * First of all, we have to get the UBI device to prevent its removal.
 112          */
 113         ubi = ubi_get_device(ubi_num);
 114         if (!ubi)
 115                 return ERR_PTR(-ENODEV);
 116
 117         if (vol_id < 0 || vol_id >= ubi->vtbl_slots) {
 118                 err = -EINVAL;
 119                 goto out_put_ubi;
 120         }
 121
 122         desc = kmalloc(sizeof(struct ubi_volume_desc), GFP_KERNEL);
 123         if (!desc) {
 124                 err = -ENOMEM;
 125                 goto out_put_ubi;
 126         }
 127
 128         err = -ENODEV;
 129         if (!try_module_get(THIS_MODULE))
 130                 goto out_free;
 131
 132         spin_lock(&ubi->volumes_lock);
 133         vol = ubi->volumes[vol_id];
 134         if (!vol)
 135                 goto out_unlock;
 136
 137         err = -EBUSY;
 138         switch (mode) {
 139         case UBI_READONLY:
 140                 if (vol->exclusive)
 141                         goto out_unlock;
 142                 vol->readers += 1;
 143                 break;
 144
 145         case UBI_READWRITE:
 146                 if (vol->exclusive || vol->writers > 0)
 147                         goto out_unlock;
 148                 vol->writers += 1;
 149                 break;
 150
 151         case UBI_EXCLUSIVE:
 152                 if (vol->exclusive || vol->writers || vol->readers)
 153                         goto out_unlock;
 154                 vol->exclusive = 1;
 155                 break;
 156         }
 157         get_device(&vol->dev);
 158         vol->ref_count += 1;
 159         spin_unlock(&ubi->volumes_lock);
 160
 161         desc->vol = vol;
 162         desc->mode = mode;
 163
 164         mutex_lock(&ubi->ckvol_mutex);
 165         if (!vol->checked) {
 166                 /* This is the first open - check the volume */
 167                 err = ubi_check_volume(ubi, vol_id);
 168                 if (err < 0) {
 169                         mutex_unlock(&ubi->ckvol_mutex);
 170                         ubi_close_volume(desc);
 171                         return ERR_PTR(err);
 172                 }
 173                 if (err == 1) {
 174                         ubi_warn("volume %d on UBI device %d is corrupted",
 175                                  vol_id, ubi->ubi_num);
 176                         vol->corrupted = 1;
 177                 }
 178                 vol->checked = 1;
 179         }
 180         mutex_unlock(&ubi->ckvol_mutex);
 181
 182         return desc;
 183
 184 out_unlock:
 185         spin_unlock(&ubi->volumes_lock);
 186         module_put(THIS_MODULE);
 187 out_free:
 188         kfree(desc);
 189 out_put_ubi:
 190         ubi_put_device(ubi);
 191         return ERR_PTR(err);
 192 }
 193 EXPORT_SYMBOL_GPL(ubi_open_volume);
 194
 195 /**
 196  * ubi_open_volume_nm - open UBI volume by name.
 197  * @ubi_num: UBI device number
 198  * @name: volume name
 199  * @mode: open mode
 200  *
 201  * This function is similar to 'ubi_open_volume()', but opens a volume by name.
 202  */
 203 struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
 204                                            int mode)
 205 {
 206         int i, vol_id = -1, len;
 207         struct ubi_device *ubi;
 208         struct ubi_volume_desc *ret;
 209
 210         dbg_msg("open volume %s, mode %d", name, mode);
 211
 212         if (!name)
 213                 return ERR_PTR(-EINVAL);
 214
 215         len = strnlen(name, UBI_VOL_NAME_MAX + 1);
 216         if (len > UBI_VOL_NAME_MAX)
 217                 return ERR_PTR(-EINVAL);
 218
 219         if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
 220                 return ERR_PTR(-EINVAL);
 221
 222         ubi = ubi_get_device(ubi_num);
 223         if (!ubi)
 224                 return ERR_PTR(-ENODEV);
 225
 226         spin_lock(&ubi->volumes_lock);
 227         /* Walk all volumes of this UBI device */
 228         for (i = 0; i < ubi->vtbl_slots; i++) {
 229                 struct ubi_volume *vol = ubi->volumes[i];
 230
 231                 if (vol && len == vol->name_len && !strcmp(name, vol->name)) {
 232                         vol_id = i;
 233                         break;
 234                 }
 235         }
 236         spin_unlock(&ubi->volumes_lock);
 237
 238         if (vol_id >= 0)
 239                 ret = ubi_open_volume(ubi_num, vol_id, mode);
 240         else
 241                 ret = ERR_PTR(-ENODEV);
 242
 243         /*
 244          * We should put the UBI device even in case of success, because
 245          * 'ubi_open_volume()' took a reference as well.
 246          */
 247         ubi_put_device(ubi);
 248         return ret;
 249 }
 250 EXPORT_SYMBOL_GPL(ubi_open_volume_nm);
 251
 252 /**
 253  * ubi_close_volume - close UBI volume.
 254  * @desc: volume descriptor
 255  */
 256 void ubi_close_volume(struct ubi_volume_desc *desc)
 257 {
 258         struct ubi_volume *vol = desc->vol;
 259         struct ubi_device *ubi = vol->ubi;
 260
 261         dbg_msg("close volume %d, mode %d", vol->vol_id, desc->mode);
 262
 263         spin_lock(&ubi->volumes_lock);
 264         switch (desc->mode) {
 265         case UBI_READONLY:
 266                 vol->readers -= 1;
 267                 break;
 268         case UBI_READWRITE:
 269                 vol->writers -= 1;
 270                 break;
 271         case UBI_EXCLUSIVE:
 272                 vol->exclusive = 0;
 273         }
 274         vol->ref_count -= 1;
 275         spin_unlock(&ubi->volumes_lock);
 276
 277         kfree(desc);
 278         put_device(&vol->dev);
 279         ubi_put_device(ubi);
 280         module_put(THIS_MODULE);
 281 }
 282 EXPORT_SYMBOL_GPL(ubi_close_volume);
 283
 284 /**
 285  * ubi_leb_read - read data.
 286  * @desc: volume descriptor
 287  * @lnum: logical eraseblock number to read from
 288  * @buf: buffer where to store the read data
 289  * @offset: offset within the logical eraseblock to read from
 290  * @len: how many bytes to read
 291  * @check: whether UBI has to check the read data's CRC or not.
 292  *
 293  * This function reads data from offset @offset of logical eraseblock @lnum and
 294  * stores the data at @buf. When reading from static volumes, @check specifies
 295  * whether the data has to be checked or not. If yes, the whole logical
 296  * eraseblock will be read and its CRC checksum will be checked (i.e., the CRC
 297  * checksum is per-eraseblock). So checking may substantially slow down the
 298  * read speed. The @check argument is ignored for dynamic volumes.
 299  *
 300  * In case of success, this function returns zero. In case of failure, this
 301  * function returns a negative error code.
 302  *
 303  * %-EBADMSG error code is returned:
 304  * o for both static and dynamic volumes if MTD driver has detected a data
 305  *   integrity problem (unrecoverable ECC checksum mismatch in case of NAND);
 306  * o for static volumes in case of data CRC mismatch.
 307  *
 308  * If the volume is damaged because of an interrupted update this function just
 309  * returns immediately with %-EBADF error code.
 310  */
 311 int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
 312                  int len, int check)
 313 {
 314         struct ubi_volume *vol = desc->vol;
 315         struct ubi_device *ubi = vol->ubi;
 316         int err, vol_id = vol->vol_id;
 317
 318         dbg_msg("read %d bytes from LEB %d:%d:%d", len, vol_id, lnum, offset);
 319
 320         if (vol_id < 0 || vol_id >= ubi->vtbl_slots || lnum < 0 ||
 321             lnum >= vol->used_ebs || offset < 0 || len < 0 ||
 322             offset + len > vol->usable_leb_size)
 323                 return -EINVAL;
 324
 325         if (vol->vol_type == UBI_STATIC_VOLUME) {
 326                 if (vol->used_ebs == 0)
 327                         /* Empty static UBI volume */
 328                         return 0;
 329                 if (lnum == vol->used_ebs - 1 &&
 330                     offset + len > vol->last_eb_bytes)
 331                         return -EINVAL;
 332         }
 333
 334         if (vol->upd_marker)
 335                 return -EBADF;
 336         if (len == 0)
 337                 return 0;
 338
 339         err = ubi_eba_read_leb(ubi, vol, lnum, buf, offset, len, check);
 340         if (err && mtd_is_eccerr(err) && vol->vol_type == UBI_STATIC_VOLUME) {
 341                 ubi_warn("mark volume %d as corrupted", vol_id);
 342                 vol->corrupted = 1;
 343         }
 344
 345         return err;
 346 }
 347 EXPORT_SYMBOL_GPL(ubi_leb_read);
 348
 349 /**
 350  * ubi_leb_write - write data.
 351  * @desc: volume descriptor
 352  * @lnum: logical eraseblock number to write to
 353  * @buf: data to write
 354  * @offset: offset within the logical eraseblock where to write
 355  * @len: how many bytes to write
 356  * @dtype: expected data type
 357  *
 358  * This function writes @len bytes of data from @buf to offset @offset of
 359  * logical eraseblock @lnum. The @dtype argument describes expected lifetime of
 360  * the data.
 361  *
 362  * This function takes care of physical eraseblock write failures. If write to
 363  * the physical eraseblock write operation fails, the logical eraseblock is
 364  * re-mapped to another physical eraseblock, the data is recovered, and the
 365  * write finishes. UBI has a pool of reserved physical eraseblocks for this.
 366  *
 367  * If all the data were successfully written, zero is returned. If an error
 368  * occurred and UBI has not been able to recover from it, this function returns
 369  * a negative error code. Note, in case of an error, it is possible that
 370  * something was still written to the flash media, but that may be some
 371  * garbage.
 372  *
 373  * If the volume is damaged because of an interrupted update this function just
 374  * returns immediately with %-EBADF code.
 375  */
 376 int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
 377                   int offset, int len, int dtype)
 378 {
 379         struct ubi_volume *vol = desc->vol;
 380         struct ubi_device *ubi = vol->ubi;
 381         int vol_id = vol->vol_id;
 382
 383         dbg_msg("write %d bytes to LEB %d:%d:%d", len, vol_id, lnum, offset);
 384
 385         if (vol_id < 0 || vol_id >= ubi->vtbl_slots)
 386                 return -EINVAL;
 387
 388         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
 389                 return -EROFS;
 390
 391         if (lnum < 0 || lnum >= vol->reserved_pebs || offset < 0 || len < 0 ||
 392             offset + len > vol->usable_leb_size ||
 393             offset & (ubi->min_io_size - 1) || len & (ubi->min_io_size - 1))
 394                 return -EINVAL;
 395
 396         if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
 397             dtype != UBI_UNKNOWN)
 398                 return -EINVAL;
 399
 400         if (vol->upd_marker)
 401                 return -EBADF;
 402
 403         if (len == 0)
 404                 return 0;
 405
 406         return ubi_eba_write_leb(ubi, vol, lnum, buf, offset, len, dtype);
 407 }
 408 EXPORT_SYMBOL_GPL(ubi_leb_write);
 409
 410 /*
 411  * ubi_leb_change - change logical eraseblock atomically.
 412  * @desc: volume descriptor
 413  * @lnum: logical eraseblock number to change
 414  * @buf: data to write
 415  * @len: how many bytes to write
 416  * @dtype: expected data type
 417  *
 418  * This function changes the contents of a logical eraseblock atomically. @buf
 419  * has to contain new logical eraseblock data, and @len - the length of the
 420  * data, which has to be aligned. The length may be shorter then the logical
 421  * eraseblock size, ant the logical eraseblock may be appended to more times
 422  * later on. This function guarantees that in case of an unclean reboot the old
 423  * contents is preserved. Returns zero in case of success and a negative error
 424  * code in case of failure.
 425  */
 426 int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
 427                    int len, int dtype)
 428 {
 429         struct ubi_volume *vol = desc->vol;
 430         struct ubi_device *ubi = vol->ubi;
 431         int vol_id = vol->vol_id;
 432
 433         dbg_msg("atomically write %d bytes to LEB %d:%d", len, vol_id, lnum);
 434
 435         if (vol_id < 0 || vol_id >= ubi->vtbl_slots)
 436                 return -EINVAL;
 437
 438         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
 439                 return -EROFS;
 440
 441         if (lnum < 0 || lnum >= vol->reserved_pebs || len < 0 ||
 442             len > vol->usable_leb_size || len & (ubi->min_io_size - 1))
 443                 return -EINVAL;
 444
 445         if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
 446             dtype != UBI_UNKNOWN)
 447                 return -EINVAL;
 448
 449         if (vol->upd_marker)
 450                 return -EBADF;
 451
 452         if (len == 0)
 453                 return 0;
 454
 455         return ubi_eba_atomic_leb_change(ubi, vol, lnum, buf, len, dtype);
 456 }
 457 EXPORT_SYMBOL_GPL(ubi_leb_change);
 458
 459 /**
 460  * ubi_leb_erase - erase logical eraseblock.
 461  * @desc: volume descriptor
 462  * @lnum: logical eraseblock number
 463  *
 464  * This function un-maps logical eraseblock @lnum and synchronously erases the
 465  * correspondent physical eraseblock. Returns zero in case of success and a
 466  * negative error code in case of failure.
 467  *
 468  * If the volume is damaged because of an interrupted update this function just
 469  * returns immediately with %-EBADF code.
 470  */
 471 int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum)
 472 {
 473         struct ubi_volume *vol = desc->vol;
 474         struct ubi_device *ubi = vol->ubi;
 475         int err;
 476
 477         dbg_msg("erase LEB %d:%d", vol->vol_id, lnum);
 478
 479         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
 480                 return -EROFS;
 481
 482         if (lnum < 0 || lnum >= vol->reserved_pebs)
 483                 return -EINVAL;
 484
 485         if (vol->upd_marker)
 486                 return -EBADF;
 487
 488         err = ubi_eba_unmap_leb(ubi, vol, lnum);
 489         if (err)
 490                 return err;
 491
 492         return ubi_wl_flush(ubi);
 493 }
 494 EXPORT_SYMBOL_GPL(ubi_leb_erase);
 495
 496 /**
 497  * ubi_leb_unmap - un-map logical eraseblock.
 498  * @desc: volume descriptor
 499  * @lnum: logical eraseblock number
 500  *
 501  * This function un-maps logical eraseblock @lnum and schedules the
 502  * corresponding physical eraseblock for erasure, so that it will eventually be
 503  * physically erased in background. This operation is much faster then the
 504  * erase operation.
 505  *
 506  * Unlike erase, the un-map operation does not guarantee that the logical
 507  * eraseblock will contain all 0xFF bytes when UBI is initialized again. For
 508  * example, if several logical eraseblocks are un-mapped, and an unclean reboot
 509  * happens after this, the logical eraseblocks will not necessarily be
 510  * un-mapped again when this MTD device is attached. They may actually be
 511  * mapped to the same physical eraseblocks again. So, this function has to be
 512  * used with care.
 513  *
 514  * In other words, when un-mapping a logical eraseblock, UBI does not store
 515  * any information about this on the flash media, it just marks the logical
 516  * eraseblock as "un-mapped" in RAM. If UBI is detached before the physical
 517  * eraseblock is physically erased, it will be mapped again to the same logical
 518  * eraseblock when the MTD device is attached again.
 519  *
 520  * The main and obvious use-case of this function is when the contents of a
 521  * logical eraseblock has to be re-written. Then it is much more efficient to
 522  * first un-map it, then write new data, rather then first erase it, then write
 523  * new data. Note, once new data has been written to the logical eraseblock,
 524  * UBI guarantees that the old contents has gone forever. In other words, if an
 525  * unclean reboot happens after the logical eraseblock has been un-mapped and
 526  * then written to, it will contain the last written data.
 527  *
 528  * This function returns zero in case of success and a negative error code in
 529  * case of failure. If the volume is damaged because of an interrupted update
 530  * this function just returns immediately with %-EBADF code.
 531  */
 532 int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum)
 533 {
 534         struct ubi_volume *vol = desc->vol;
 535         struct ubi_device *ubi = vol->ubi;
 536
 537         dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum);
 538
 539         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
 540                 return -EROFS;
 541
 542         if (lnum < 0 || lnum >= vol->reserved_pebs)
 543                 return -EINVAL;
 544
 545         if (vol->upd_marker)
 546                 return -EBADF;
 547
 548         return ubi_eba_unmap_leb(ubi, vol, lnum);
 549 }
 550 EXPORT_SYMBOL_GPL(ubi_leb_unmap);
 551
 552 /**
 553  * ubi_leb_map - map logical erasblock to a physical eraseblock.
 554  * @desc: volume descriptor
 555  * @lnum: logical eraseblock number
 556  * @dtype: expected data type
 557  *
 558  * This function maps an un-mapped logical eraseblock @lnum to a physical
 559  * eraseblock. This means, that after a successfull invocation of this
 560  * function the logical eraseblock @lnum will be empty (contain only %0xFF
 561  * bytes) and be mapped to a physical eraseblock, even if an unclean reboot
 562  * happens.
 563  *
 564  * This function returns zero in case of success, %-EBADF if the volume is
 565  * damaged because of an interrupted update, %-EBADMSG if the logical
 566  * eraseblock is already mapped, and other negative error codes in case of
 567  * other failures.
 568  */
 569 int ubi_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype)
 570 {
 571         struct ubi_volume *vol = desc->vol;
 572         struct ubi_device *ubi = vol->ubi;
 573
 574         dbg_msg("unmap LEB %d:%d", vol->vol_id, lnum);
 575
 576         if (desc->mode == UBI_READONLY || vol->vol_type == UBI_STATIC_VOLUME)
 577                 return -EROFS;
 578
 579         if (lnum < 0 || lnum >= vol->reserved_pebs)
 580                 return -EINVAL;
 581
 582         if (dtype != UBI_LONGTERM && dtype != UBI_SHORTTERM &&
 583             dtype != UBI_UNKNOWN)
 584                 return -EINVAL;
 585
 586         if (vol->upd_marker)
 587                 return -EBADF;
 588
 589         if (vol->eba_tbl[lnum] >= 0)
 590                 return -EBADMSG;
 591
 592         return ubi_eba_write_leb(ubi, vol, lnum, NULL, 0, 0, dtype);
 593 }
 594 EXPORT_SYMBOL_GPL(ubi_leb_map);
 595
 596 /**
 597  * ubi_is_mapped - check if logical eraseblock is mapped.
 598  * @desc: volume descriptor
 599  * @lnum: logical eraseblock number
 600  *
 601  * This function checks if logical eraseblock @lnum is mapped to a physical
 602  * eraseblock. If a logical eraseblock is un-mapped, this does not necessarily
 603  * mean it will still be un-mapped after the UBI device is re-attached. The
 604  * logical eraseblock may become mapped to the physical eraseblock it was last
 605  * mapped to.
 606  *
 607  * This function returns %1 if the LEB is mapped, %0 if not, and a negative
 608  * error code in case of failure. If the volume is damaged because of an
 609  * interrupted update this function just returns immediately with %-EBADF error
 610  * code.
 611  */
 612 int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum)
 613 {
 614         struct ubi_volume *vol = desc->vol;
 615
 616         dbg_msg("test LEB %d:%d", vol->vol_id, lnum);
 617
 618         if (lnum < 0 || lnum >= vol->reserved_pebs)
 619                 return -EINVAL;
 620
 621         if (vol->upd_marker)
 622                 return -EBADF;
 623
 624         return vol->eba_tbl[lnum] >= 0;
 625 }
 626 EXPORT_SYMBOL_GPL(ubi_is_mapped);