drivers/mtd/ubi/vmt.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 /*
  10  * This file contains implementation of volume creation, deletion, updating and
  11  * resizing.
  12  */
  13
  14 #define __UBOOT__
  15 #ifndef __UBOOT__
  16 #include <linux/err.h>
  17 #include <linux/slab.h>
  18 #include <linux/export.h>
  19 #else
  20 #include <div64.h>
  21 #include <ubi_uboot.h>
  22 #endif
  23 #include <linux/math64.h>
  24
  25 #include "ubi.h"
  26
  27 static int self_check_volumes(struct ubi_device *ubi);
  28
  29 #ifndef __UBOOT__
  30 static ssize_t vol_attribute_show(struct device *dev,
  31                                   struct device_attribute *attr, char *buf);
  32
  33 /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
  34 static struct device_attribute attr_vol_reserved_ebs =
  35         __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
  36 static struct device_attribute attr_vol_type =
  37         __ATTR(type, S_IRUGO, vol_attribute_show, NULL);
  38 static struct device_attribute attr_vol_name =
  39         __ATTR(name, S_IRUGO, vol_attribute_show, NULL);
  40 static struct device_attribute attr_vol_corrupted =
  41         __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
  42 static struct device_attribute attr_vol_alignment =
  43         __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
  44 static struct device_attribute attr_vol_usable_eb_size =
  45         __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
  46 static struct device_attribute attr_vol_data_bytes =
  47         __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
  48 static struct device_attribute attr_vol_upd_marker =
  49         __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
  50
  51 /*
  52  * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
  53  *
  54  * Consider a situation:
  55  * A. process 1 opens a sysfs file related to volume Y, say
  56  *    /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
  57  * B. process 2 removes volume Y;
  58  * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
  59  *
  60  * In this situation, this function will return %-ENODEV because it will find
  61  * out that the volume was removed from the @ubi->volumes array.
  62  */
  63 static ssize_t vol_attribute_show(struct device *dev,
  64                                   struct device_attribute *attr, char *buf)
  65 {
  66         int ret;
  67         struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
  68         struct ubi_device *ubi;
  69
  70         ubi = ubi_get_device(vol->ubi->ubi_num);
  71         if (!ubi)
  72                 return -ENODEV;
  73
  74         spin_lock(&ubi->volumes_lock);
  75         if (!ubi->volumes[vol->vol_id]) {
  76                 spin_unlock(&ubi->volumes_lock);
  77                 ubi_put_device(ubi);
  78                 return -ENODEV;
  79         }
  80         /* Take a reference to prevent volume removal */
  81         vol->ref_count += 1;
  82         spin_unlock(&ubi->volumes_lock);
  83
  84         if (attr == &attr_vol_reserved_ebs)
  85                 ret = sprintf(buf, "%d\n", vol->reserved_pebs);
  86         else if (attr == &attr_vol_type) {
  87                 const char *tp;
  88
  89                 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
  90                         tp = "dynamic";
  91                 else
  92                         tp = "static";
  93                 ret = sprintf(buf, "%s\n", tp);
  94         } else if (attr == &attr_vol_name)
  95                 ret = sprintf(buf, "%s\n", vol->name);
  96         else if (attr == &attr_vol_corrupted)
  97                 ret = sprintf(buf, "%d\n", vol->corrupted);
  98         else if (attr == &attr_vol_alignment)
  99                 ret = sprintf(buf, "%d\n", vol->alignment);
 100         else if (attr == &attr_vol_usable_eb_size)
 101                 ret = sprintf(buf, "%d\n", vol->usable_leb_size);
 102         else if (attr == &attr_vol_data_bytes)
 103                 ret = sprintf(buf, "%lld\n", vol->used_bytes);
 104         else if (attr == &attr_vol_upd_marker)
 105                 ret = sprintf(buf, "%d\n", vol->upd_marker);
 106         else
 107                 /* This must be a bug */
 108                 ret = -EINVAL;
 109
 110         /* We've done the operation, drop volume and UBI device references */
 111         spin_lock(&ubi->volumes_lock);
 112         vol->ref_count -= 1;
 113         ubi_assert(vol->ref_count >= 0);
 114         spin_unlock(&ubi->volumes_lock);
 115         ubi_put_device(ubi);
 116         return ret;
 117 }
 118 #endif
 119
 120 /* Release method for volume devices */
 121 static void vol_release(struct device *dev)
 122 {
 123         struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
 124
 125         kfree(vol->eba_tbl);
 126         kfree(vol);
 127 }
 128
 129 #ifndef __UBOOT__
 130 /**
 131  * volume_sysfs_init - initialize sysfs for new volume.
 132  * @ubi: UBI device description object
 133  * @vol: volume description object
 134  *
 135  * This function returns zero in case of success and a negative error code in
 136  * case of failure.
 137  *
 138  * Note, this function does not free allocated resources in case of failure -
 139  * the caller does it. This is because this would cause release() here and the
 140  * caller would oops.
 141  */
 142 static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol)
 143 {
 144         int err;
 145
 146         err = device_create_file(&vol->dev, &attr_vol_reserved_ebs);
 147         if (err)
 148                 return err;
 149         err = device_create_file(&vol->dev, &attr_vol_type);
 150         if (err)
 151                 return err;
 152         err = device_create_file(&vol->dev, &attr_vol_name);
 153         if (err)
 154                 return err;
 155         err = device_create_file(&vol->dev, &attr_vol_corrupted);
 156         if (err)
 157                 return err;
 158         err = device_create_file(&vol->dev, &attr_vol_alignment);
 159         if (err)
 160                 return err;
 161         err = device_create_file(&vol->dev, &attr_vol_usable_eb_size);
 162         if (err)
 163                 return err;
 164         err = device_create_file(&vol->dev, &attr_vol_data_bytes);
 165         if (err)
 166                 return err;
 167         err = device_create_file(&vol->dev, &attr_vol_upd_marker);
 168         return err;
 169 }
 170
 171 /**
 172  * volume_sysfs_close - close sysfs for a volume.
 173  * @vol: volume description object
 174  */
 175 static void volume_sysfs_close(struct ubi_volume *vol)
 176 {
 177         device_remove_file(&vol->dev, &attr_vol_upd_marker);
 178         device_remove_file(&vol->dev, &attr_vol_data_bytes);
 179         device_remove_file(&vol->dev, &attr_vol_usable_eb_size);
 180         device_remove_file(&vol->dev, &attr_vol_alignment);
 181         device_remove_file(&vol->dev, &attr_vol_corrupted);
 182         device_remove_file(&vol->dev, &attr_vol_name);
 183         device_remove_file(&vol->dev, &attr_vol_type);
 184         device_remove_file(&vol->dev, &attr_vol_reserved_ebs);
 185         device_unregister(&vol->dev);
 186 }
 187 #endif
 188
 189 /**
 190  * ubi_create_volume - create volume.
 191  * @ubi: UBI device description object
 192  * @req: volume creation request
 193  *
 194  * This function creates volume described by @req. If @req->vol_id id
 195  * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
 196  * and saves it in @req->vol_id. Returns zero in case of success and a negative
 197  * error code in case of failure. Note, the caller has to have the
 198  * @ubi->device_mutex locked.
 199  */
 200 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 201 {
 202         int i, err, vol_id = req->vol_id, do_free = 1;
 203         struct ubi_volume *vol;
 204         struct ubi_vtbl_record vtbl_rec;
 205         dev_t dev;
 206
 207         if (ubi->ro_mode)
 208                 return -EROFS;
 209
 210         vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
 211         if (!vol)
 212                 return -ENOMEM;
 213
 214         spin_lock(&ubi->volumes_lock);
 215         if (vol_id == UBI_VOL_NUM_AUTO) {
 216                 /* Find unused volume ID */
 217                 dbg_gen("search for vacant volume ID");
 218                 for (i = 0; i < ubi->vtbl_slots; i++)
 219                         if (!ubi->volumes[i]) {
 220                                 vol_id = i;
 221                                 break;
 222                         }
 223
 224                 if (vol_id == UBI_VOL_NUM_AUTO) {
 225                         ubi_err("out of volume IDs");
 226                         err = -ENFILE;
 227                         goto out_unlock;
 228                 }
 229                 req->vol_id = vol_id;
 230         }
 231
 232         dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s",
 233                 ubi->ubi_num, vol_id, (unsigned long long)req->bytes,
 234                 (int)req->vol_type, req->name);
 235
 236         /* Ensure that this volume does not exist */
 237         err = -EEXIST;
 238         if (ubi->volumes[vol_id]) {
 239                 ubi_err("volume %d already exists", vol_id);
 240                 goto out_unlock;
 241         }
 242
 243         /* Ensure that the name is unique */
 244         for (i = 0; i < ubi->vtbl_slots; i++)
 245                 if (ubi->volumes[i] &&
 246                     ubi->volumes[i]->name_len == req->name_len &&
 247                     !strcmp(ubi->volumes[i]->name, req->name)) {
 248                         ubi_err("volume \"%s\" exists (ID %d)", req->name, i);
 249                         goto out_unlock;
 250                 }
 251
 252         /* Calculate how many eraseblocks are requested */
 253         vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
 254         vol->reserved_pebs += div_u64(req->bytes + vol->usable_leb_size - 1,
 255                                       vol->usable_leb_size);
 256
 257         /* Reserve physical eraseblocks */
 258         if (vol->reserved_pebs > ubi->avail_pebs) {
 259                 ubi_err("not enough PEBs, only %d available", ubi->avail_pebs);
 260                 if (ubi->corr_peb_count)
 261                         ubi_err("%d PEBs are corrupted and not used",
 262                                 ubi->corr_peb_count);
 263                 err = -ENOSPC;
 264                 goto out_unlock;
 265         }
 266         ubi->avail_pebs -= vol->reserved_pebs;
 267         ubi->rsvd_pebs += vol->reserved_pebs;
 268         spin_unlock(&ubi->volumes_lock);
 269
 270         vol->vol_id    = vol_id;
 271         vol->alignment = req->alignment;
 272         vol->data_pad  = ubi->leb_size % vol->alignment;
 273         vol->vol_type  = req->vol_type;
 274         vol->name_len  = req->name_len;
 275         memcpy(vol->name, req->name, vol->name_len);
 276         vol->ubi = ubi;
 277
 278         /*
 279          * Finish all pending erases because there may be some LEBs belonging
 280          * to the same volume ID.
 281          */
 282         err = ubi_wl_flush(ubi, vol_id, UBI_ALL);
 283         if (err)
 284                 goto out_acc;
 285
 286         vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
 287         if (!vol->eba_tbl) {
 288                 err = -ENOMEM;
 289                 goto out_acc;
 290         }
 291
 292         for (i = 0; i < vol->reserved_pebs; i++)
 293                 vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
 294
 295         if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
 296                 vol->used_ebs = vol->reserved_pebs;
 297                 vol->last_eb_bytes = vol->usable_leb_size;
 298                 vol->used_bytes =
 299                         (long long)vol->used_ebs * vol->usable_leb_size;
 300         } else {
 301                 vol->used_ebs = div_u64_rem(vol->used_bytes,
 302                                             vol->usable_leb_size,
 303                                             &vol->last_eb_bytes);
 304                 if (vol->last_eb_bytes != 0)
 305                         vol->used_ebs += 1;
 306                 else
 307                         vol->last_eb_bytes = vol->usable_leb_size;
 308         }
 309
 310         /* Register character device for the volume */
 311         cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
 312         vol->cdev.owner = THIS_MODULE;
 313         dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1);
 314         err = cdev_add(&vol->cdev, dev, 1);
 315         if (err) {
 316                 ubi_err("cannot add character device");
 317                 goto out_mapping;
 318         }
 319
 320         vol->dev.release = vol_release;
 321         vol->dev.parent = &ubi->dev;
 322         vol->dev.devt = dev;
 323         vol->dev.class = ubi_class;
 324
 325         dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
 326         err = device_register(&vol->dev);
 327         if (err) {
 328                 ubi_err("cannot register device");
 329                 goto out_cdev;
 330         }
 331
 332         err = volume_sysfs_init(ubi, vol);
 333         if (err)
 334                 goto out_sysfs;
 335
 336         /* Fill volume table record */
 337         memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
 338         vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
 339         vtbl_rec.alignment     = cpu_to_be32(vol->alignment);
 340         vtbl_rec.data_pad      = cpu_to_be32(vol->data_pad);
 341         vtbl_rec.name_len      = cpu_to_be16(vol->name_len);
 342         if (vol->vol_type == UBI_DYNAMIC_VOLUME)
 343                 vtbl_rec.vol_type = UBI_VID_DYNAMIC;
 344         else
 345                 vtbl_rec.vol_type = UBI_VID_STATIC;
 346         memcpy(vtbl_rec.name, vol->name, vol->name_len);
 347
 348         err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
 349         if (err)
 350                 goto out_sysfs;
 351
 352         spin_lock(&ubi->volumes_lock);
 353         ubi->volumes[vol_id] = vol;
 354         ubi->vol_count += 1;
 355         spin_unlock(&ubi->volumes_lock);
 356
 357         ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
 358         self_check_volumes(ubi);
 359         return err;
 360
 361 out_sysfs:
 362         /*
 363          * We have registered our device, we should not free the volume
 364          * description object in this function in case of an error - it is
 365          * freed by the release function.
 366          *
 367          * Get device reference to prevent the release function from being
 368          * called just after sysfs has been closed.
 369          */
 370         do_free = 0;
 371         get_device(&vol->dev);
 372         volume_sysfs_close(vol);
 373 out_cdev:
 374         cdev_del(&vol->cdev);
 375 out_mapping:
 376         if (do_free)
 377                 kfree(vol->eba_tbl);
 378 out_acc:
 379         spin_lock(&ubi->volumes_lock);
 380         ubi->rsvd_pebs -= vol->reserved_pebs;
 381         ubi->avail_pebs += vol->reserved_pebs;
 382 out_unlock:
 383         spin_unlock(&ubi->volumes_lock);
 384         if (do_free)
 385                 kfree(vol);
 386         else
 387                 put_device(&vol->dev);
 388         ubi_err("cannot create volume %d, error %d", vol_id, err);
 389         return err;
 390 }
 391
 392 /**
 393  * ubi_remove_volume - remove volume.
 394  * @desc: volume descriptor
 395  * @no_vtbl: do not change volume table if not zero
 396  *
 397  * This function removes volume described by @desc. The volume has to be opened
 398  * in "exclusive" mode. Returns zero in case of success and a negative error
 399  * code in case of failure. The caller has to have the @ubi->device_mutex
 400  * locked.
 401  */
 402 int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
 403 {
 404         struct ubi_volume *vol = desc->vol;
 405         struct ubi_device *ubi = vol->ubi;
 406         int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
 407
 408         dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id);
 409         ubi_assert(desc->mode == UBI_EXCLUSIVE);
 410         ubi_assert(vol == ubi->volumes[vol_id]);
 411
 412         if (ubi->ro_mode)
 413                 return -EROFS;
 414
 415         spin_lock(&ubi->volumes_lock);
 416         if (vol->ref_count > 1) {
 417                 /*
 418                  * The volume is busy, probably someone is reading one of its
 419                  * sysfs files.
 420                  */
 421                 err = -EBUSY;
 422                 goto out_unlock;
 423         }
 424         ubi->volumes[vol_id] = NULL;
 425         spin_unlock(&ubi->volumes_lock);
 426
 427         if (!no_vtbl) {
 428                 err = ubi_change_vtbl_record(ubi, vol_id, NULL);
 429                 if (err)
 430                         goto out_err;
 431         }
 432
 433         for (i = 0; i < vol->reserved_pebs; i++) {
 434                 err = ubi_eba_unmap_leb(ubi, vol, i);
 435                 if (err)
 436                         goto out_err;
 437         }
 438
 439         cdev_del(&vol->cdev);
 440         volume_sysfs_close(vol);
 441
 442         spin_lock(&ubi->volumes_lock);
 443         ubi->rsvd_pebs -= reserved_pebs;
 444         ubi->avail_pebs += reserved_pebs;
 445         ubi_update_reserved(ubi);
 446         ubi->vol_count -= 1;
 447         spin_unlock(&ubi->volumes_lock);
 448
 449         ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED);
 450         if (!no_vtbl)
 451                 self_check_volumes(ubi);
 452
 453         return err;
 454
 455 out_err:
 456         ubi_err("cannot remove volume %d, error %d", vol_id, err);
 457         spin_lock(&ubi->volumes_lock);
 458         ubi->volumes[vol_id] = vol;
 459 out_unlock:
 460         spin_unlock(&ubi->volumes_lock);
 461         return err;
 462 }
 463
 464 /**
 465  * ubi_resize_volume - re-size volume.
 466  * @desc: volume descriptor
 467  * @reserved_pebs: new size in physical eraseblocks
 468  *
 469  * This function re-sizes the volume and returns zero in case of success, and a
 470  * negative error code in case of failure. The caller has to have the
 471  * @ubi->device_mutex locked.
 472  */
 473 int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
 474 {
 475         int i, err, pebs, *new_mapping;
 476         struct ubi_volume *vol = desc->vol;
 477         struct ubi_device *ubi = vol->ubi;
 478         struct ubi_vtbl_record vtbl_rec;
 479         int vol_id = vol->vol_id;
 480
 481         if (ubi->ro_mode)
 482                 return -EROFS;
 483
 484         dbg_gen("re-size device %d, volume %d to from %d to %d PEBs",
 485                 ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs);
 486
 487         if (vol->vol_type == UBI_STATIC_VOLUME &&
 488             reserved_pebs < vol->used_ebs) {
 489                 ubi_err("too small size %d, %d LEBs contain data",
 490                         reserved_pebs, vol->used_ebs);
 491                 return -EINVAL;
 492         }
 493
 494         /* If the size is the same, we have nothing to do */
 495         if (reserved_pebs == vol->reserved_pebs)
 496                 return 0;
 497
 498         new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
 499         if (!new_mapping)
 500                 return -ENOMEM;
 501
 502         for (i = 0; i < reserved_pebs; i++)
 503                 new_mapping[i] = UBI_LEB_UNMAPPED;
 504
 505         spin_lock(&ubi->volumes_lock);
 506         if (vol->ref_count > 1) {
 507                 spin_unlock(&ubi->volumes_lock);
 508                 err = -EBUSY;
 509                 goto out_free;
 510         }
 511         spin_unlock(&ubi->volumes_lock);
 512
 513         /* Reserve physical eraseblocks */
 514         pebs = reserved_pebs - vol->reserved_pebs;
 515         if (pebs > 0) {
 516                 spin_lock(&ubi->volumes_lock);
 517                 if (pebs > ubi->avail_pebs) {
 518                         ubi_err("not enough PEBs: requested %d, available %d",
 519                                 pebs, ubi->avail_pebs);
 520                         if (ubi->corr_peb_count)
 521                                 ubi_err("%d PEBs are corrupted and not used",
 522                                         ubi->corr_peb_count);
 523                         spin_unlock(&ubi->volumes_lock);
 524                         err = -ENOSPC;
 525                         goto out_free;
 526                 }
 527                 ubi->avail_pebs -= pebs;
 528                 ubi->rsvd_pebs += pebs;
 529                 for (i = 0; i < vol->reserved_pebs; i++)
 530                         new_mapping[i] = vol->eba_tbl[i];
 531                 kfree(vol->eba_tbl);
 532                 vol->eba_tbl = new_mapping;
 533                 spin_unlock(&ubi->volumes_lock);
 534         }
 535
 536         /* Change volume table record */
 537         vtbl_rec = ubi->vtbl[vol_id];
 538         vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
 539         err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
 540         if (err)
 541                 goto out_acc;
 542
 543         if (pebs < 0) {
 544                 for (i = 0; i < -pebs; i++) {
 545                         err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i);
 546                         if (err)
 547                                 goto out_acc;
 548                 }
 549                 spin_lock(&ubi->volumes_lock);
 550                 ubi->rsvd_pebs += pebs;
 551                 ubi->avail_pebs -= pebs;
 552                 ubi_update_reserved(ubi);
 553                 for (i = 0; i < reserved_pebs; i++)
 554                         new_mapping[i] = vol->eba_tbl[i];
 555                 kfree(vol->eba_tbl);
 556                 vol->eba_tbl = new_mapping;
 557                 spin_unlock(&ubi->volumes_lock);
 558         }
 559
 560         vol->reserved_pebs = reserved_pebs;
 561         if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
 562                 vol->used_ebs = reserved_pebs;
 563                 vol->last_eb_bytes = vol->usable_leb_size;
 564                 vol->used_bytes =
 565                         (long long)vol->used_ebs * vol->usable_leb_size;
 566         }
 567
 568         ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED);
 569         self_check_volumes(ubi);
 570         return err;
 571
 572 out_acc:
 573         if (pebs > 0) {
 574                 spin_lock(&ubi->volumes_lock);
 575                 ubi->rsvd_pebs -= pebs;
 576                 ubi->avail_pebs += pebs;
 577                 spin_unlock(&ubi->volumes_lock);
 578         }
 579 out_free:
 580         kfree(new_mapping);
 581         return err;
 582 }
 583
 584 /**
 585  * ubi_rename_volumes - re-name UBI volumes.
 586  * @ubi: UBI device description object
 587  * @rename_list: list of &struct ubi_rename_entry objects
 588  *
 589  * This function re-names or removes volumes specified in the re-name list.
 590  * Returns zero in case of success and a negative error code in case of
 591  * failure.
 592  */
 593 int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
 594 {
 595         int err;
 596         struct ubi_rename_entry *re;
 597
 598         err = ubi_vtbl_rename_volumes(ubi, rename_list);
 599         if (err)
 600                 return err;
 601
 602         list_for_each_entry(re, rename_list, list) {
 603                 if (re->remove) {
 604                         err = ubi_remove_volume(re->desc, 1);
 605                         if (err)
 606                                 break;
 607                 } else {
 608                         struct ubi_volume *vol = re->desc->vol;
 609
 610                         spin_lock(&ubi->volumes_lock);
 611                         vol->name_len = re->new_name_len;
 612                         memcpy(vol->name, re->new_name, re->new_name_len + 1);
 613                         spin_unlock(&ubi->volumes_lock);
 614                         ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED);
 615                 }
 616         }
 617
 618         if (!err)
 619                 self_check_volumes(ubi);
 620         return err;
 621 }
 622
 623 /**
 624  * ubi_add_volume - add volume.
 625  * @ubi: UBI device description object
 626  * @vol: volume description object
 627  *
 628  * This function adds an existing volume and initializes all its data
 629  * structures. Returns zero in case of success and a negative error code in
 630  * case of failure.
 631  */
 632 int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
 633 {
 634         int err, vol_id = vol->vol_id;
 635         dev_t dev;
 636
 637         dbg_gen("add volume %d", vol_id);
 638
 639         /* Register character device for the volume */
 640         cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
 641         vol->cdev.owner = THIS_MODULE;
 642         dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1);
 643         err = cdev_add(&vol->cdev, dev, 1);
 644         if (err) {
 645                 ubi_err("cannot add character device for volume %d, error %d",
 646                         vol_id, err);
 647                 return err;
 648         }
 649
 650         vol->dev.release = vol_release;
 651         vol->dev.parent = &ubi->dev;
 652         vol->dev.devt = dev;
 653         vol->dev.class = ubi_class;
 654         dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
 655         err = device_register(&vol->dev);
 656         if (err)
 657                 goto out_cdev;
 658
 659         err = volume_sysfs_init(ubi, vol);
 660         if (err) {
 661                 cdev_del(&vol->cdev);
 662                 volume_sysfs_close(vol);
 663                 return err;
 664         }
 665
 666         self_check_volumes(ubi);
 667         return err;
 668
 669 out_cdev:
 670         cdev_del(&vol->cdev);
 671         return err;
 672 }
 673
 674 /**
 675  * ubi_free_volume - free volume.
 676  * @ubi: UBI device description object
 677  * @vol: volume description object
 678  *
 679  * This function frees all resources for volume @vol but does not remove it.
 680  * Used only when the UBI device is detached.
 681  */
 682 void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol)
 683 {
 684         dbg_gen("free volume %d", vol->vol_id);
 685
 686         ubi->volumes[vol->vol_id] = NULL;
 687         cdev_del(&vol->cdev);
 688         volume_sysfs_close(vol);
 689 }
 690
 691 /**
 692  * self_check_volume - check volume information.
 693  * @ubi: UBI device description object
 694  * @vol_id: volume ID
 695  *
 696  * Returns zero if volume is all right and a a negative error code if not.
 697  */
 698 static int self_check_volume(struct ubi_device *ubi, int vol_id)
 699 {
 700         int idx = vol_id2idx(ubi, vol_id);
 701         int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
 702         const struct ubi_volume *vol;
 703         long long n;
 704         const char *name;
 705
 706         spin_lock(&ubi->volumes_lock);
 707         reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
 708         vol = ubi->volumes[idx];
 709
 710         if (!vol) {
 711                 if (reserved_pebs) {
 712                         ubi_err("no volume info, but volume exists");
 713                         goto fail;
 714                 }
 715                 spin_unlock(&ubi->volumes_lock);
 716                 return 0;
 717         }
 718
 719         if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
 720             vol->name_len < 0) {
 721                 ubi_err("negative values");
 722                 goto fail;
 723         }
 724         if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
 725                 ubi_err("bad alignment");
 726                 goto fail;
 727         }
 728
 729         n = vol->alignment & (ubi->min_io_size - 1);
 730         if (vol->alignment != 1 && n) {
 731                 ubi_err("alignment is not multiple of min I/O unit");
 732                 goto fail;
 733         }
 734
 735         n = ubi->leb_size % vol->alignment;
 736         if (vol->data_pad != n) {
 737                 ubi_err("bad data_pad, has to be %lld", n);
 738                 goto fail;
 739         }
 740
 741         if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
 742             vol->vol_type != UBI_STATIC_VOLUME) {
 743                 ubi_err("bad vol_type");
 744                 goto fail;
 745         }
 746
 747         if (vol->upd_marker && vol->corrupted) {
 748                 ubi_err("update marker and corrupted simultaneously");
 749                 goto fail;
 750         }
 751
 752         if (vol->reserved_pebs > ubi->good_peb_count) {
 753                 ubi_err("too large reserved_pebs");
 754                 goto fail;
 755         }
 756
 757         n = ubi->leb_size - vol->data_pad;
 758         if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
 759                 ubi_err("bad usable_leb_size, has to be %lld", n);
 760                 goto fail;
 761         }
 762
 763         if (vol->name_len > UBI_VOL_NAME_MAX) {
 764                 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
 765                 goto fail;
 766         }
 767
 768         n = strnlen(vol->name, vol->name_len + 1);
 769         if (n != vol->name_len) {
 770                 ubi_err("bad name_len %lld", n);
 771                 goto fail;
 772         }
 773
 774         n = (long long)vol->used_ebs * vol->usable_leb_size;
 775         if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
 776                 if (vol->corrupted) {
 777                         ubi_err("corrupted dynamic volume");
 778                         goto fail;
 779                 }
 780                 if (vol->used_ebs != vol->reserved_pebs) {
 781                         ubi_err("bad used_ebs");
 782                         goto fail;
 783                 }
 784                 if (vol->last_eb_bytes != vol->usable_leb_size) {
 785                         ubi_err("bad last_eb_bytes");
 786                         goto fail;
 787                 }
 788                 if (vol->used_bytes != n) {
 789                         ubi_err("bad used_bytes");
 790                         goto fail;
 791                 }
 792         } else {
 793                 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
 794                         ubi_err("bad used_ebs");
 795                         goto fail;
 796                 }
 797                 if (vol->last_eb_bytes < 0 ||
 798                     vol->last_eb_bytes > vol->usable_leb_size) {
 799                         ubi_err("bad last_eb_bytes");
 800                         goto fail;
 801                 }
 802                 if (vol->used_bytes < 0 || vol->used_bytes > n ||
 803                     vol->used_bytes < n - vol->usable_leb_size) {
 804                         ubi_err("bad used_bytes");
 805                         goto fail;
 806                 }
 807         }
 808
 809         alignment  = be32_to_cpu(ubi->vtbl[vol_id].alignment);
 810         data_pad   = be32_to_cpu(ubi->vtbl[vol_id].data_pad);
 811         name_len   = be16_to_cpu(ubi->vtbl[vol_id].name_len);
 812         upd_marker = ubi->vtbl[vol_id].upd_marker;
 813         name       = &ubi->vtbl[vol_id].name[0];
 814         if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
 815                 vol_type = UBI_DYNAMIC_VOLUME;
 816         else
 817                 vol_type = UBI_STATIC_VOLUME;
 818
 819         if (alignment != vol->alignment || data_pad != vol->data_pad ||
 820             upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
 821             name_len != vol->name_len || strncmp(name, vol->name, name_len)) {
 822                 ubi_err("volume info is different");
 823                 goto fail;
 824         }
 825
 826         spin_unlock(&ubi->volumes_lock);
 827         return 0;
 828
 829 fail:
 830         ubi_err("self-check failed for volume %d", vol_id);
 831         if (vol)
 832                 ubi_dump_vol_info(vol);
 833         ubi_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
 834         dump_stack();
 835         spin_unlock(&ubi->volumes_lock);
 836         return -EINVAL;
 837 }
 838
 839 /**
 840  * self_check_volumes - check information about all volumes.
 841  * @ubi: UBI device description object
 842  *
 843  * Returns zero if volumes are all right and a a negative error code if not.
 844  */
 845 static int self_check_volumes(struct ubi_device *ubi)
 846 {
 847         int i, err = 0;
 848
 849         if (!ubi_dbg_chk_gen(ubi))
 850                 return 0;
 851
 852         for (i = 0; i < ubi->vtbl_slots; i++) {
 853                 err = self_check_volume(ubi, i);
 854                 if (err)
 855                         break;
 856         }
 857
 858         return err;
 859 }