drivers/mtd/ubi/vmt.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  * This file contains implementation of volume creation, deletion, updating and
  23  * resizing.
  24  */
  25
  26 #include <linux/err.h>
  27 #include <asm/div64.h>
  28 #include "ubi.h"
  29
  30 #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
  31 static void paranoid_check_volumes(struct ubi_device *ubi);
  32 #else
  33 #define paranoid_check_volumes(ubi)
  34 #endif
  35
  36 static ssize_t vol_attribute_show(struct device *dev,
  37                                   struct device_attribute *attr, char *buf);
  38
  39 /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
  40 static struct device_attribute vol_reserved_ebs =
  41         __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
  42 static struct device_attribute vol_type =
  43         __ATTR(type, S_IRUGO, vol_attribute_show, NULL);
  44 static struct device_attribute vol_name =
  45         __ATTR(name, S_IRUGO, vol_attribute_show, NULL);
  46 static struct device_attribute vol_corrupted =
  47         __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
  48 static struct device_attribute vol_alignment =
  49         __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
  50 static struct device_attribute vol_usable_eb_size =
  51         __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
  52 static struct device_attribute vol_data_bytes =
  53         __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
  54 static struct device_attribute vol_upd_marker =
  55         __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
  56
  57 /*
  58  * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
  59  *
  60  * Consider a situation:
  61  * A. process 1 opens a sysfs file related to volume Y, say
  62  *    /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
  63  * B. process 2 removes volume Y;
  64  * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
  65  *
  66  * What we want to do in a situation like that is to return error when the file
  67  * is read. This is done by means of the 'removed' flag and the 'vol_lock' of
  68  * the UBI volume description object.
  69  */
  70 static ssize_t vol_attribute_show(struct device *dev,
  71                                   struct device_attribute *attr, char *buf)
  72 {
  73         int ret;
  74         struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
  75
  76         spin_lock(&vol->ubi->volumes_lock);
  77         if (vol->removed) {
  78                 spin_unlock(&vol->ubi->volumes_lock);
  79                 return -ENODEV;
  80         }
  81         if (attr == &vol_reserved_ebs)
  82                 ret = sprintf(buf, "%d\n", vol->reserved_pebs);
  83         else if (attr == &vol_type) {
  84                 const char *tp;
  85                 tp = vol->vol_type == UBI_DYNAMIC_VOLUME ? "dynamic" : "static";
  86                 ret = sprintf(buf, "%s\n", tp);
  87         } else if (attr == &vol_name)
  88                 ret = sprintf(buf, "%s\n", vol->name);
  89         else if (attr == &vol_corrupted)
  90                 ret = sprintf(buf, "%d\n", vol->corrupted);
  91         else if (attr == &vol_alignment)
  92                 ret = sprintf(buf, "%d\n", vol->alignment);
  93         else if (attr == &vol_usable_eb_size) {
  94                 ret = sprintf(buf, "%d\n", vol->usable_leb_size);
  95         } else if (attr == &vol_data_bytes)
  96                 ret = sprintf(buf, "%lld\n", vol->used_bytes);
  97         else if (attr == &vol_upd_marker)
  98                 ret = sprintf(buf, "%d\n", vol->upd_marker);
  99         else
 100                 BUG();
 101         spin_unlock(&vol->ubi->volumes_lock);
 102         return ret;
 103 }
 104
 105 /* Release method for volume devices */
 106 static void vol_release(struct device *dev)
 107 {
 108         struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
 109         ubi_assert(vol->removed);
 110         kfree(vol);
 111 }
 112
 113 /**
 114  * volume_sysfs_init - initialize sysfs for new volume.
 115  * @ubi: UBI device description object
 116  * @vol: volume description object
 117  *
 118  * This function returns zero in case of success and a negative error code in
 119  * case of failure.
 120  *
 121  * Note, this function does not free allocated resources in case of failure -
 122  * the caller does it. This is because this would cause release() here and the
 123  * caller would oops.
 124  */
 125 static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol)
 126 {
 127         int err;
 128
 129         err = device_create_file(&vol->dev, &vol_reserved_ebs);
 130         if (err)
 131                 return err;
 132         err = device_create_file(&vol->dev, &vol_type);
 133         if (err)
 134                 return err;
 135         err = device_create_file(&vol->dev, &vol_name);
 136         if (err)
 137                 return err;
 138         err = device_create_file(&vol->dev, &vol_corrupted);
 139         if (err)
 140                 return err;
 141         err = device_create_file(&vol->dev, &vol_alignment);
 142         if (err)
 143                 return err;
 144         err = device_create_file(&vol->dev, &vol_usable_eb_size);
 145         if (err)
 146                 return err;
 147         err = device_create_file(&vol->dev, &vol_data_bytes);
 148         if (err)
 149                 return err;
 150         err = device_create_file(&vol->dev, &vol_upd_marker);
 151         if (err)
 152                 return err;
 153         return 0;
 154 }
 155
 156 /**
 157  * volume_sysfs_close - close sysfs for a volume.
 158  * @vol: volume description object
 159  */
 160 static void volume_sysfs_close(struct ubi_volume *vol)
 161 {
 162         device_remove_file(&vol->dev, &vol_upd_marker);
 163         device_remove_file(&vol->dev, &vol_data_bytes);
 164         device_remove_file(&vol->dev, &vol_usable_eb_size);
 165         device_remove_file(&vol->dev, &vol_alignment);
 166         device_remove_file(&vol->dev, &vol_corrupted);
 167         device_remove_file(&vol->dev, &vol_name);
 168         device_remove_file(&vol->dev, &vol_type);
 169         device_remove_file(&vol->dev, &vol_reserved_ebs);
 170         device_unregister(&vol->dev);
 171 }
 172
 173 /**
 174  * ubi_create_volume - create volume.
 175  * @ubi: UBI device description object
 176  * @req: volume creation request
 177  *
 178  * This function creates volume described by @req. If @req->vol_id id
 179  * %UBI_VOL_NUM_AUTO, this function automatically assigne ID to the new volume
 180  * and saves it in @req->vol_id. Returns zero in case of success and a negative
 181  * error code in case of failure.
 182  */
 183 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 184 {
 185         int i, err, vol_id = req->vol_id;
 186         struct ubi_volume *vol;
 187         struct ubi_vtbl_record vtbl_rec;
 188         uint64_t bytes;
 189
 190         if (ubi->ro_mode)
 191                 return -EROFS;
 192
 193         vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
 194         if (!vol)
 195                 return -ENOMEM;
 196
 197         spin_lock(&ubi->volumes_lock);
 198
 199         if (vol_id == UBI_VOL_NUM_AUTO) {
 200                 /* Find unused volume ID */
 201                 dbg_msg("search for vacant volume ID");
 202                 for (i = 0; i < ubi->vtbl_slots; i++)
 203                         if (!ubi->volumes[i]) {
 204                                 vol_id = i;
 205                                 break;
 206                         }
 207
 208                 if (vol_id == UBI_VOL_NUM_AUTO) {
 209                         dbg_err("out of volume IDs");
 210                         err = -ENFILE;
 211                         goto out_unlock;
 212                 }
 213                 req->vol_id = vol_id;
 214         }
 215
 216         dbg_msg("volume ID %d, %llu bytes, type %d, name %s",
 217                 vol_id, (unsigned long long)req->bytes,
 218                 (int)req->vol_type, req->name);
 219
 220         /* Ensure that this volume does not exist */
 221         err = -EEXIST;
 222         if (ubi->volumes[vol_id]) {
 223                 dbg_err("volume %d already exists", vol_id);
 224                 goto out_unlock;
 225         }
 226
 227         /* Ensure that the name is unique */
 228         for (i = 0; i < ubi->vtbl_slots; i++)
 229                 if (ubi->volumes[i] &&
 230                     ubi->volumes[i]->name_len == req->name_len &&
 231                     strcmp(ubi->volumes[i]->name, req->name) == 0) {
 232                         dbg_err("volume \"%s\" exists (ID %d)", req->name, i);
 233                         goto out_unlock;
 234                 }
 235
 236         /* Calculate how many eraseblocks are requested */
 237         vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
 238         bytes = req->bytes;
 239         if (do_div(bytes, vol->usable_leb_size))
 240                 vol->reserved_pebs = 1;
 241         vol->reserved_pebs += bytes;
 242
 243         /* Reserve physical eraseblocks */
 244         if (vol->reserved_pebs > ubi->avail_pebs) {
 245                 dbg_err("not enough PEBs, only %d available", ubi->avail_pebs);
 246                 spin_unlock(&ubi->volumes_lock);
 247                 err = -ENOSPC;
 248                 goto out_unlock;
 249         }
 250         ubi->avail_pebs -= vol->reserved_pebs;
 251         ubi->rsvd_pebs += vol->reserved_pebs;
 252
 253         vol->vol_id    = vol_id;
 254         vol->alignment = req->alignment;
 255         vol->data_pad  = ubi->leb_size % vol->alignment;
 256         vol->vol_type  = req->vol_type;
 257         vol->name_len  = req->name_len;
 258         memcpy(vol->name, req->name, vol->name_len + 1);
 259         vol->exclusive = 1;
 260         vol->ubi = ubi;
 261         ubi->volumes[vol_id] = vol;
 262         spin_unlock(&ubi->volumes_lock);
 263
 264         /*
 265          * Finish all pending erases because there may be some LEBs belonging
 266          * to the same volume ID.
 267          */
 268         err = ubi_wl_flush(ubi);
 269         if (err)
 270                 goto out_acc;
 271
 272         vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
 273         if (!vol->eba_tbl) {
 274                 err = -ENOMEM;
 275                 goto out_acc;
 276         }
 277
 278         for (i = 0; i < vol->reserved_pebs; i++)
 279                 vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
 280
 281         if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
 282                 vol->used_ebs = vol->reserved_pebs;
 283                 vol->last_eb_bytes = vol->usable_leb_size;
 284                 vol->used_bytes = vol->used_ebs * vol->usable_leb_size;
 285         } else {
 286                 bytes = vol->used_bytes;
 287                 vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size);
 288                 vol->used_ebs = bytes;
 289                 if (vol->last_eb_bytes)
 290                         vol->used_ebs += 1;
 291                 else
 292                         vol->last_eb_bytes = vol->usable_leb_size;
 293         }
 294
 295         /* Register character device for the volume */
 296         cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
 297         vol->cdev.owner = THIS_MODULE;
 298         err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol_id + 1), 1);
 299         if (err) {
 300                 ubi_err("cannot add character device for volume %d", vol_id);
 301                 goto out_mapping;
 302         }
 303
 304         err = ubi_create_gluebi(ubi, vol);
 305         if (err)
 306                 goto out_cdev;
 307
 308         vol->dev.release = vol_release;
 309         vol->dev.parent = &ubi->dev;
 310         vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
 311         vol->dev.class = ubi_class;
 312         sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
 313         err = device_register(&vol->dev);
 314         if (err)
 315                 goto out_gluebi;
 316
 317         err = volume_sysfs_init(ubi, vol);
 318         if (err)
 319                 goto out_sysfs;
 320
 321         /* Fill volume table record */
 322         memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
 323         vtbl_rec.reserved_pebs = cpu_to_ubi32(vol->reserved_pebs);
 324         vtbl_rec.alignment     = cpu_to_ubi32(vol->alignment);
 325         vtbl_rec.data_pad      = cpu_to_ubi32(vol->data_pad);
 326         vtbl_rec.name_len      = cpu_to_ubi16(vol->name_len);
 327         if (vol->vol_type == UBI_DYNAMIC_VOLUME)
 328                 vtbl_rec.vol_type = UBI_VID_DYNAMIC;
 329         else
 330                 vtbl_rec.vol_type = UBI_VID_STATIC;
 331         memcpy(vtbl_rec.name, vol->name, vol->name_len + 1);
 332
 333         err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
 334         if (err)
 335                 goto out_sysfs;
 336
 337         spin_lock(&ubi->volumes_lock);
 338         ubi->vol_count += 1;
 339         vol->exclusive = 0;
 340         spin_unlock(&ubi->volumes_lock);
 341
 342         paranoid_check_volumes(ubi);
 343         return 0;
 344
 345 out_gluebi:
 346         err = ubi_destroy_gluebi(vol);
 347 out_cdev:
 348         cdev_del(&vol->cdev);
 349 out_mapping:
 350         kfree(vol->eba_tbl);
 351 out_acc:
 352         spin_lock(&ubi->volumes_lock);
 353         ubi->rsvd_pebs -= vol->reserved_pebs;
 354         ubi->avail_pebs += vol->reserved_pebs;
 355 out_unlock:
 356         spin_unlock(&ubi->volumes_lock);
 357         kfree(vol);
 358         return err;
 359
 360         /*
 361          * We are registered, so @vol is destroyed in the release function and
 362          * we have to de-initialize differently.
 363          */
 364 out_sysfs:
 365         err = ubi_destroy_gluebi(vol);
 366         cdev_del(&vol->cdev);
 367         kfree(vol->eba_tbl);
 368         spin_lock(&ubi->volumes_lock);
 369         ubi->rsvd_pebs -= vol->reserved_pebs;
 370         ubi->avail_pebs += vol->reserved_pebs;
 371         spin_unlock(&ubi->volumes_lock);
 372         volume_sysfs_close(vol);
 373         return err;
 374 }
 375
 376 /**
 377  * ubi_remove_volume - remove volume.
 378  * @desc: volume descriptor
 379  *
 380  * This function removes volume described by @desc. The volume has to be opened
 381  * in "exclusive" mode. Returns zero in case of success and a negative error
 382  * code in case of failure.
 383  */
 384 int ubi_remove_volume(struct ubi_volume_desc *desc)
 385 {
 386         struct ubi_volume *vol = desc->vol;
 387         struct ubi_device *ubi = vol->ubi;
 388         int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
 389
 390         dbg_msg("remove UBI volume %d", vol_id);
 391         ubi_assert(desc->mode == UBI_EXCLUSIVE);
 392         ubi_assert(vol == ubi->volumes[vol_id]);
 393
 394         if (ubi->ro_mode)
 395                 return -EROFS;
 396
 397         err = ubi_destroy_gluebi(vol);
 398         if (err)
 399                 return err;
 400
 401         err = ubi_change_vtbl_record(ubi, vol_id, NULL);
 402         if (err)
 403                 return err;
 404
 405         for (i = 0; i < vol->reserved_pebs; i++) {
 406                 err = ubi_eba_unmap_leb(ubi, vol_id, i);
 407                 if (err)
 408                         return err;
 409         }
 410
 411         spin_lock(&ubi->volumes_lock);
 412         vol->removed = 1;
 413         ubi->volumes[vol_id] = NULL;
 414         spin_unlock(&ubi->volumes_lock);
 415
 416         kfree(vol->eba_tbl);
 417         vol->eba_tbl = NULL;
 418         cdev_del(&vol->cdev);
 419         volume_sysfs_close(vol);
 420         kfree(desc);
 421
 422         spin_lock(&ubi->volumes_lock);
 423         ubi->rsvd_pebs -= reserved_pebs;
 424         ubi->avail_pebs += reserved_pebs;
 425         i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
 426         if (i > 0) {
 427                 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
 428                 ubi->avail_pebs -= i;
 429                 ubi->rsvd_pebs += i;
 430                 ubi->beb_rsvd_pebs += i;
 431                 if (i > 0)
 432                         ubi_msg("reserve more %d PEBs", i);
 433         }
 434         ubi->vol_count -= 1;
 435         spin_unlock(&ubi->volumes_lock);
 436
 437         paranoid_check_volumes(ubi);
 438         module_put(THIS_MODULE);
 439         return 0;
 440 }
 441
 442 /**
 443  * ubi_resize_volume - re-size volume.
 444  * @desc: volume descriptor
 445  * @reserved_pebs: new size in physical eraseblocks
 446  *
 447  * This function returns zero in case of success, and a negative error code in
 448  * case of failure.
 449  */
 450 int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
 451 {
 452         int i, err, pebs, *new_mapping;
 453         struct ubi_volume *vol = desc->vol;
 454         struct ubi_device *ubi = vol->ubi;
 455         struct ubi_vtbl_record vtbl_rec;
 456         int vol_id = vol->vol_id;
 457
 458         if (ubi->ro_mode)
 459                 return -EROFS;
 460
 461         dbg_msg("re-size volume %d to from %d to %d PEBs",
 462                 vol_id, vol->reserved_pebs, reserved_pebs);
 463         ubi_assert(desc->mode == UBI_EXCLUSIVE);
 464         ubi_assert(vol == ubi->volumes[vol_id]);
 465
 466         if (vol->vol_type == UBI_STATIC_VOLUME &&
 467             reserved_pebs < vol->used_ebs) {
 468                 dbg_err("too small size %d, %d LEBs contain data",
 469                         reserved_pebs, vol->used_ebs);
 470                 return -EINVAL;
 471         }
 472
 473         /* If the size is the same, we have nothing to do */
 474         if (reserved_pebs == vol->reserved_pebs)
 475                 return 0;
 476
 477         new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
 478         if (!new_mapping)
 479                 return -ENOMEM;
 480
 481         for (i = 0; i < reserved_pebs; i++)
 482                 new_mapping[i] = UBI_LEB_UNMAPPED;
 483
 484         /* Reserve physical eraseblocks */
 485         pebs = reserved_pebs - vol->reserved_pebs;
 486         if (pebs > 0) {
 487                 spin_lock(&ubi->volumes_lock);
 488                 if (pebs > ubi->avail_pebs) {
 489                         dbg_err("not enough PEBs: requested %d, available %d",
 490                                 pebs, ubi->avail_pebs);
 491                         spin_unlock(&ubi->volumes_lock);
 492                         err = -ENOSPC;
 493                         goto out_free;
 494                 }
 495                 ubi->avail_pebs -= pebs;
 496                 ubi->rsvd_pebs += pebs;
 497                 for (i = 0; i < vol->reserved_pebs; i++)
 498                         new_mapping[i] = vol->eba_tbl[i];
 499                 kfree(vol->eba_tbl);
 500                 vol->eba_tbl = new_mapping;
 501                 spin_unlock(&ubi->volumes_lock);
 502         }
 503
 504         /* Change volume table record */
 505         memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
 506         vtbl_rec.reserved_pebs = cpu_to_ubi32(reserved_pebs);
 507         err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
 508         if (err)
 509                 goto out_acc;
 510
 511         if (pebs < 0) {
 512                 for (i = 0; i < -pebs; i++) {
 513                         err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i);
 514                         if (err)
 515                                 goto out_acc;
 516                 }
 517                 spin_lock(&ubi->volumes_lock);
 518                 ubi->rsvd_pebs += pebs;
 519                 ubi->avail_pebs -= pebs;
 520                 pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
 521                 if (pebs > 0) {
 522                         pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
 523                         ubi->avail_pebs -= pebs;
 524                         ubi->rsvd_pebs += pebs;
 525                         ubi->beb_rsvd_pebs += pebs;
 526                         if (pebs > 0)
 527                                 ubi_msg("reserve more %d PEBs", pebs);
 528                 }
 529                 for (i = 0; i < 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         vol->reserved_pebs = reserved_pebs;
 537         if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
 538                 vol->used_ebs = reserved_pebs;
 539                 vol->last_eb_bytes = vol->usable_leb_size;
 540                 vol->used_bytes = vol->used_ebs * vol->usable_leb_size;
 541         }
 542
 543         paranoid_check_volumes(ubi);
 544         return 0;
 545
 546 out_acc:
 547         if (pebs > 0) {
 548                 spin_lock(&ubi->volumes_lock);
 549                 ubi->rsvd_pebs -= pebs;
 550                 ubi->avail_pebs += pebs;
 551                 spin_unlock(&ubi->volumes_lock);
 552         }
 553 out_free:
 554         kfree(new_mapping);
 555         return err;
 556 }
 557
 558 /**
 559  * ubi_add_volume - add volume.
 560  * @ubi: UBI device description object
 561  * @vol_id: volume ID
 562  *
 563  * This function adds an existin volume and initializes all its data
 564  * structures. Returnes zero in case of success and a negative error code in
 565  * case of failure.
 566  */
 567 int ubi_add_volume(struct ubi_device *ubi, int vol_id)
 568 {
 569         int err;
 570         struct ubi_volume *vol = ubi->volumes[vol_id];
 571
 572         dbg_msg("add volume %d", vol_id);
 573         ubi_dbg_dump_vol_info(vol);
 574         ubi_assert(vol);
 575
 576         /* Register character device for the volume */
 577         cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
 578         vol->cdev.owner = THIS_MODULE;
 579         err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1);
 580         if (err) {
 581                 ubi_err("cannot add character device for volume %d", vol_id);
 582                 return err;
 583         }
 584
 585         err = ubi_create_gluebi(ubi, vol);
 586         if (err)
 587                 goto out_cdev;
 588
 589         vol->dev.release = vol_release;
 590         vol->dev.parent = &ubi->dev;
 591         vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
 592         vol->dev.class = ubi_class;
 593         sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
 594         err = device_register(&vol->dev);
 595         if (err)
 596                 goto out_gluebi;
 597
 598         err = volume_sysfs_init(ubi, vol);
 599         if (err) {
 600                 cdev_del(&vol->cdev);
 601                 err = ubi_destroy_gluebi(vol);
 602                 volume_sysfs_close(vol);
 603                 return err;
 604         }
 605
 606         paranoid_check_volumes(ubi);
 607         return 0;
 608
 609 out_gluebi:
 610         err = ubi_destroy_gluebi(vol);
 611 out_cdev:
 612         cdev_del(&vol->cdev);
 613         return err;
 614 }
 615
 616 /**
 617  * ubi_free_volume - free volume.
 618  * @ubi: UBI device description object
 619  * @vol_id: volume ID
 620  *
 621  * This function frees all resources for volume @vol_id but does not remove it.
 622  * Used only when the UBI device is detached.
 623  */
 624 void ubi_free_volume(struct ubi_device *ubi, int vol_id)
 625 {
 626         int err;
 627         struct ubi_volume *vol = ubi->volumes[vol_id];
 628
 629         dbg_msg("free volume %d", vol_id);
 630         ubi_assert(vol);
 631
 632         vol->removed = 1;
 633         err = ubi_destroy_gluebi(vol);
 634         ubi->volumes[vol_id] = NULL;
 635         cdev_del(&vol->cdev);
 636         volume_sysfs_close(vol);
 637 }
 638
 639 #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
 640
 641 /**
 642  * paranoid_check_volume - check volume information.
 643  * @ubi: UBI device description object
 644  * @vol_id: volume ID
 645  */
 646 static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id)
 647 {
 648         int idx = vol_id2idx(ubi, vol_id);
 649         int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
 650         const struct ubi_volume *vol = ubi->volumes[idx];
 651         long long n;
 652         const char *name;
 653
 654         reserved_pebs = ubi32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
 655
 656         if (!vol) {
 657                 if (reserved_pebs) {
 658                         ubi_err("no volume info, but volume exists");
 659                         goto fail;
 660                 }
 661                 return;
 662         }
 663
 664         if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
 665             vol->name_len < 0) {
 666                 ubi_err("negative values");
 667                 goto fail;
 668         }
 669         if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
 670                 ubi_err("bad alignment");
 671                 goto fail;
 672         }
 673
 674         n = vol->alignment % ubi->min_io_size;
 675         if (vol->alignment != 1 && n) {
 676                 ubi_err("alignment is not multiple of min I/O unit");
 677                 goto fail;
 678         }
 679
 680         n = ubi->leb_size % vol->alignment;
 681         if (vol->data_pad != n) {
 682                 ubi_err("bad data_pad, has to be %lld", n);
 683                 goto fail;
 684         }
 685
 686         if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
 687             vol->vol_type != UBI_STATIC_VOLUME) {
 688                 ubi_err("bad vol_type");
 689                 goto fail;
 690         }
 691
 692         if (vol->upd_marker != 0 && vol->upd_marker != 1) {
 693                 ubi_err("bad upd_marker");
 694                 goto fail;
 695         }
 696
 697         if (vol->upd_marker && vol->corrupted) {
 698                 dbg_err("update marker and corrupted simultaneously");
 699                 goto fail;
 700         }
 701
 702         if (vol->reserved_pebs > ubi->good_peb_count) {
 703                 ubi_err("too large reserved_pebs");
 704                 goto fail;
 705         }
 706
 707         n = ubi->leb_size - vol->data_pad;
 708         if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
 709                 ubi_err("bad usable_leb_size, has to be %lld", n);
 710                 goto fail;
 711         }
 712
 713         if (vol->name_len > UBI_VOL_NAME_MAX) {
 714                 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
 715                 goto fail;
 716         }
 717
 718         if (!vol->name) {
 719                 ubi_err("NULL volume name");
 720                 goto fail;
 721         }
 722
 723         n = strnlen(vol->name, vol->name_len + 1);
 724         if (n != vol->name_len) {
 725                 ubi_err("bad name_len %lld", n);
 726                 goto fail;
 727         }
 728
 729         n = vol->used_ebs * vol->usable_leb_size;
 730         if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
 731                 if (vol->corrupted != 0) {
 732                         ubi_err("corrupted dynamic volume");
 733                         goto fail;
 734                 }
 735                 if (vol->used_ebs != vol->reserved_pebs) {
 736                         ubi_err("bad used_ebs");
 737                         goto fail;
 738                 }
 739                 if (vol->last_eb_bytes != vol->usable_leb_size) {
 740                         ubi_err("bad last_eb_bytes");
 741                         goto fail;
 742                 }
 743                 if (vol->used_bytes != n) {
 744                         ubi_err("bad used_bytes");
 745                         goto fail;
 746                 }
 747         } else {
 748                 if (vol->corrupted != 0 && vol->corrupted != 1) {
 749                         ubi_err("bad corrupted");
 750                         goto fail;
 751                 }
 752                 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
 753                         ubi_err("bad used_ebs");
 754                         goto fail;
 755                 }
 756                 if (vol->last_eb_bytes < 0 ||
 757                     vol->last_eb_bytes > vol->usable_leb_size) {
 758                         ubi_err("bad last_eb_bytes");
 759                         goto fail;
 760                 }
 761                 if (vol->used_bytes < 0 || vol->used_bytes > n ||
 762                     vol->used_bytes < n - vol->usable_leb_size) {
 763                         ubi_err("bad used_bytes");
 764                         goto fail;
 765                 }
 766         }
 767
 768         alignment  = ubi32_to_cpu(ubi->vtbl[vol_id].alignment);
 769         data_pad   = ubi32_to_cpu(ubi->vtbl[vol_id].data_pad);
 770         name_len   = ubi16_to_cpu(ubi->vtbl[vol_id].name_len);
 771         upd_marker = ubi->vtbl[vol_id].upd_marker;
 772         name       = &ubi->vtbl[vol_id].name[0];
 773         if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
 774                 vol_type = UBI_DYNAMIC_VOLUME;
 775         else
 776                 vol_type = UBI_STATIC_VOLUME;
 777
 778         if (alignment != vol->alignment || data_pad != vol->data_pad ||
 779             upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
 780             name_len!= vol->name_len || strncmp(name, vol->name, name_len)) {
 781                 ubi_err("volume info is different");
 782                 goto fail;
 783         }
 784
 785         return;
 786
 787 fail:
 788         ubi_err("paranoid check failed");
 789         ubi_dbg_dump_vol_info(vol);
 790         ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
 791         BUG();
 792 }
 793
 794 /**
 795  * paranoid_check_volumes - check information about all volumes.
 796  * @ubi: UBI device description object
 797  */
 798 static void paranoid_check_volumes(struct ubi_device *ubi)
 799 {
 800         int i;
 801
 802         mutex_lock(&ubi->vtbl_mutex);
 803         spin_lock(&ubi->volumes_lock);
 804         for (i = 0; i < ubi->vtbl_slots; i++)
 805                 paranoid_check_volume(ubi, i);
 806         spin_unlock(&ubi->volumes_lock);
 807         mutex_unlock(&ubi->vtbl_mutex);
 808 }
 809 #endif