130444Sbde// SPDX-License-Identifier: GPL-2.0-or-later 230444Sbde/* 3 * Copyright (c) International Business Machines Corp., 2006 4 * 5 * Author: Artem Bityutskiy (���������������� ����������) 6 */ 7 8/* 9 * This file contains implementation of volume creation, deletion, updating and 10 * resizing. 11 */ 12 13#include <linux/err.h> 14#include <linux/math64.h> 15#include <linux/slab.h> 16#include <linux/export.h> 17#include "ubi.h" 18 19static int self_check_volumes(struct ubi_device *ubi); 20 21static ssize_t vol_attribute_show(struct device *dev, 22 struct device_attribute *attr, char *buf); 23 24/* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */ 25static struct device_attribute attr_vol_reserved_ebs = 26 __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); 27static struct device_attribute attr_vol_type = 28 __ATTR(type, S_IRUGO, vol_attribute_show, NULL); 29static struct device_attribute attr_vol_name = 30 __ATTR(name, S_IRUGO, vol_attribute_show, NULL); 31static struct device_attribute attr_vol_corrupted = 32 __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); 33static struct device_attribute attr_vol_alignment = 34 __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); 35static struct device_attribute attr_vol_usable_eb_size = 36 __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); 37static struct device_attribute attr_vol_data_bytes = 38 __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); 39static struct device_attribute attr_vol_upd_marker = 40 __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL); 41 42/* 43 * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'. 44 * 45 * Consider a situation: 46 * A. process 1 opens a sysfs file related to volume Y, say 47 * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs; 48 * B. process 2 removes volume Y; 49 * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file; 50 * 51 * In this situation, this function will return %-ENODEV because it will find 52 * out that the volume was removed from the @ubi->volumes array. 53 */ 54static ssize_t vol_attribute_show(struct device *dev, 55 struct device_attribute *attr, char *buf) 56{ 57 int ret; 58 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); 59 struct ubi_device *ubi = vol->ubi; 60 61 spin_lock(&ubi->volumes_lock); 62 if (!ubi->volumes[vol->vol_id] || ubi->volumes[vol->vol_id]->is_dead) { 63 spin_unlock(&ubi->volumes_lock); 64 return -ENODEV; 65 } 66 /* Take a reference to prevent volume removal */ 67 vol->ref_count += 1; 68 spin_unlock(&ubi->volumes_lock); 69 70 if (attr == &attr_vol_reserved_ebs) 71 ret = sprintf(buf, "%d\n", vol->reserved_pebs); 72 else if (attr == &attr_vol_type) { 73 const char *tp; 74 75 if (vol->vol_type == UBI_DYNAMIC_VOLUME) 76 tp = "dynamic"; 77 else 78 tp = "static"; 79 ret = sprintf(buf, "%s\n", tp); 80 } else if (attr == &attr_vol_name) 81 ret = sprintf(buf, "%s\n", vol->name); 82 else if (attr == &attr_vol_corrupted) 83 ret = sprintf(buf, "%d\n", vol->corrupted); 84 else if (attr == &attr_vol_alignment) 85 ret = sprintf(buf, "%d\n", vol->alignment); 86 else if (attr == &attr_vol_usable_eb_size) 87 ret = sprintf(buf, "%d\n", vol->usable_leb_size); 88 else if (attr == &attr_vol_data_bytes) 89 ret = sprintf(buf, "%lld\n", vol->used_bytes); 90 else if (attr == &attr_vol_upd_marker) 91 ret = sprintf(buf, "%d\n", vol->upd_marker); 92 else 93 /* This must be a bug */ 94 ret = -EINVAL; 95 96 /* We've done the operation, drop volume and UBI device references */ 97 spin_lock(&ubi->volumes_lock); 98 vol->ref_count -= 1; 99 ubi_assert(vol->ref_count >= 0); 100 spin_unlock(&ubi->volumes_lock); 101 return ret; 102} 103 104static struct attribute *volume_dev_attrs[] = { 105 &attr_vol_reserved_ebs.attr, 106 &attr_vol_type.attr, 107 &attr_vol_name.attr, 108 &attr_vol_corrupted.attr, 109 &attr_vol_alignment.attr, 110 &attr_vol_usable_eb_size.attr, 111 &attr_vol_data_bytes.attr, 112 &attr_vol_upd_marker.attr, 113 NULL 114}; 115ATTRIBUTE_GROUPS(volume_dev); 116 117/* Release method for volume devices */ 118static void vol_release(struct device *dev) 119{ 120 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); 121 122 ubi_eba_replace_table(vol, NULL); 123 ubi_fastmap_destroy_checkmap(vol); 124 kfree(vol); 125} 126 127static struct fwnode_handle *find_volume_fwnode(struct ubi_volume *vol) 128{ 129 struct fwnode_handle *fw_vols, *fw_vol; 130 const char *volname; 131 u32 volid; 132 133 fw_vols = device_get_named_child_node(vol->dev.parent->parent, "volumes"); 134 if (!fw_vols) 135 return NULL; 136 137 fwnode_for_each_child_node(fw_vols, fw_vol) { 138 if (!fwnode_property_read_string(fw_vol, "volname", &volname) && 139 strncmp(volname, vol->name, vol->name_len)) 140 continue; 141 142 if (!fwnode_property_read_u32(fw_vol, "volid", &volid) && 143 vol->vol_id != volid) 144 continue; 145 146 return fw_vol; 147 } 148 149 return NULL; 150} 151 152/** 153 * ubi_create_volume - create volume. 154 * @ubi: UBI device description object 155 * @req: volume creation request 156 * 157 * This function creates volume described by @req. If @req->vol_id id 158 * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume 159 * and saves it in @req->vol_id. Returns zero in case of success and a negative 160 * error code in case of failure. Note, the caller has to have the 161 * @ubi->device_mutex locked. 162 */ 163int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) 164{ 165 int i, err, vol_id = req->vol_id; 166 struct ubi_volume *vol; 167 struct ubi_vtbl_record vtbl_rec; 168 struct ubi_eba_table *eba_tbl = NULL; 169 170 if (ubi->ro_mode) 171 return -EROFS; 172 173 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); 174 if (!vol) 175 return -ENOMEM; 176 177 device_initialize(&vol->dev); 178 vol->dev.release = vol_release; 179 vol->dev.parent = &ubi->dev; 180 vol->dev.class = &ubi_class; 181 vol->dev.groups = volume_dev_groups; 182 183 if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG) 184 vol->skip_check = 1; 185 186 spin_lock(&ubi->volumes_lock); 187 if (vol_id == UBI_VOL_NUM_AUTO) { 188 /* Find unused volume ID */ 189 dbg_gen("search for vacant volume ID"); 190 for (i = 0; i < ubi->vtbl_slots; i++) 191 if (!ubi->volumes[i]) { 192 vol_id = i; 193 break; 194 } 195 196 if (vol_id == UBI_VOL_NUM_AUTO) { 197 ubi_err(ubi, "out of volume IDs"); 198 err = -ENFILE; 199 goto out_unlock; 200 } 201 req->vol_id = vol_id; 202 } 203 204 dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s", 205 ubi->ubi_num, vol_id, (unsigned long long)req->bytes, 206 (int)req->vol_type, req->name); 207 208 /* Ensure that this volume does not exist */ 209 err = -EEXIST; 210 if (ubi->volumes[vol_id]) { 211 ubi_err(ubi, "volume %d already exists", vol_id); 212 goto out_unlock; 213 } 214 215 /* Ensure that the name is unique */ 216 for (i = 0; i < ubi->vtbl_slots; i++) 217 if (ubi->volumes[i] && !ubi->volumes[i]->is_dead && 218 ubi->volumes[i]->name_len == req->name_len && 219 !strcmp(ubi->volumes[i]->name, req->name)) { 220 ubi_err(ubi, "volume \"%s\" exists (ID %d)", 221 req->name, i); 222 goto out_unlock; 223 } 224 225 /* Calculate how many eraseblocks are requested */ 226 vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; 227 vol->reserved_pebs = div_u64(req->bytes + vol->usable_leb_size - 1, 228 vol->usable_leb_size); 229 230 /* Reserve physical eraseblocks */ 231 if (vol->reserved_pebs > ubi->avail_pebs) { 232 ubi_err(ubi, "not enough PEBs, only %d available", 233 ubi->avail_pebs); 234 if (ubi->corr_peb_count) 235 ubi_err(ubi, "%d PEBs are corrupted and not used", 236 ubi->corr_peb_count); 237 err = -ENOSPC; 238 goto out_unlock; 239 } 240 ubi->avail_pebs -= vol->reserved_pebs; 241 ubi->rsvd_pebs += vol->reserved_pebs; 242 spin_unlock(&ubi->volumes_lock); 243 244 vol->vol_id = vol_id; 245 vol->alignment = req->alignment; 246 vol->data_pad = ubi->leb_size % vol->alignment; 247 vol->vol_type = req->vol_type; 248 vol->name_len = req->name_len; 249 memcpy(vol->name, req->name, vol->name_len); 250 vol->ubi = ubi; 251 device_set_node(&vol->dev, find_volume_fwnode(vol)); 252 253 /* 254 * Finish all pending erases because there may be some LEBs belonging 255 * to the same volume ID. 256 */ 257 err = ubi_wl_flush(ubi, vol_id, UBI_ALL); 258 if (err) 259 goto out_acc; 260 261 eba_tbl = ubi_eba_create_table(vol, vol->reserved_pebs); 262 if (IS_ERR(eba_tbl)) { 263 err = PTR_ERR(eba_tbl); 264 goto out_acc; 265 } 266 267 ubi_eba_replace_table(vol, eba_tbl); 268 269 if (vol->vol_type == UBI_DYNAMIC_VOLUME) { 270 vol->used_ebs = vol->reserved_pebs; 271 vol->last_eb_bytes = vol->usable_leb_size; 272 vol->used_bytes = 273 (long long)vol->used_ebs * vol->usable_leb_size; 274 } else { 275 vol->used_ebs = div_u64_rem(vol->used_bytes, 276 vol->usable_leb_size, 277 &vol->last_eb_bytes); 278 if (vol->last_eb_bytes != 0) 279 vol->used_ebs += 1; 280 else 281 vol->last_eb_bytes = vol->usable_leb_size; 282 } 283 284 /* Make volume "available" before it becomes accessible via sysfs */ 285 spin_lock(&ubi->volumes_lock); 286 ubi->volumes[vol_id] = vol; 287 ubi->vol_count += 1; 288 spin_unlock(&ubi->volumes_lock); 289 290 /* Register character device for the volume */ 291 cdev_init(&vol->cdev, &ubi_vol_cdev_operations); 292 vol->cdev.owner = THIS_MODULE; 293 294 vol->dev.devt = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); 295 dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); 296 err = cdev_device_add(&vol->cdev, &vol->dev); 297 if (err) { 298 ubi_err(ubi, "cannot add device"); 299 goto out_mapping; 300 } 301 302 /* Fill volume table record */ 303 memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); 304 vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); 305 vtbl_rec.alignment = cpu_to_be32(vol->alignment); 306 vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); 307 vtbl_rec.name_len = cpu_to_be16(vol->name_len); 308 if (vol->vol_type == UBI_DYNAMIC_VOLUME) 309 vtbl_rec.vol_type = UBI_VID_DYNAMIC; 310 else 311 vtbl_rec.vol_type = UBI_VID_STATIC; 312 313 if (vol->skip_check) 314 vtbl_rec.flags |= UBI_VTBL_SKIP_CRC_CHECK_FLG; 315 316 memcpy(vtbl_rec.name, vol->name, vol->name_len); 317 318 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); 319 if (err) 320 goto out_sysfs; 321 322 ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED); 323 self_check_volumes(ubi); 324 return err; 325 326out_sysfs: 327 /* 328 * We have registered our device, we should not free the volume 329 * description object in this function in case of an error - it is 330 * freed by the release function. 331 */ 332 cdev_device_del(&vol->cdev, &vol->dev); 333out_mapping: 334 spin_lock(&ubi->volumes_lock); 335 ubi->volumes[vol_id] = NULL; 336 ubi->vol_count -= 1; 337 spin_unlock(&ubi->volumes_lock); 338out_acc: 339 spin_lock(&ubi->volumes_lock); 340 ubi->rsvd_pebs -= vol->reserved_pebs; 341 ubi->avail_pebs += vol->reserved_pebs; 342out_unlock: 343 spin_unlock(&ubi->volumes_lock); 344 put_device(&vol->dev); 345 ubi_err(ubi, "cannot create volume %d, error %d", vol_id, err); 346 return err; 347} 348 349/** 350 * ubi_remove_volume - remove volume. 351 * @desc: volume descriptor 352 * @no_vtbl: do not change volume table if not zero 353 * 354 * This function removes volume described by @desc. The volume has to be opened 355 * in "exclusive" mode. Returns zero in case of success and a negative error 356 * code in case of failure. The caller has to have the @ubi->device_mutex 357 * locked. 358 */ 359int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) 360{ 361 struct ubi_volume *vol = desc->vol; 362 struct ubi_device *ubi = vol->ubi; 363 int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; 364 365 dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id); 366 ubi_assert(desc->mode == UBI_EXCLUSIVE); 367 ubi_assert(vol == ubi->volumes[vol_id]); 368 369 if (ubi->ro_mode) 370 return -EROFS; 371 372 spin_lock(&ubi->volumes_lock); 373 if (vol->ref_count > 1) { 374 /* 375 * The volume is busy, probably someone is reading one of its 376 * sysfs files. 377 */ 378 err = -EBUSY; 379 goto out_unlock; 380 } 381 382 /* 383 * Mark volume as dead at this point to prevent that anyone 384 * can take a reference to the volume from now on. 385 * This is necessary as we have to release the spinlock before 386 * calling ubi_volume_notify. 387 */ 388 vol->is_dead = true; 389 spin_unlock(&ubi->volumes_lock); 390 391 ubi_volume_notify(ubi, vol, UBI_VOLUME_SHUTDOWN); 392 393 spin_lock(&ubi->volumes_lock); 394 ubi->volumes[vol_id] = NULL; 395 spin_unlock(&ubi->volumes_lock); 396 397 if (!no_vtbl) { 398 err = ubi_change_vtbl_record(ubi, vol_id, NULL); 399 if (err) 400 goto out_err; 401 } 402 403 for (i = 0; i < vol->reserved_pebs; i++) { 404 err = ubi_eba_unmap_leb(ubi, vol, i); 405 if (err) 406 goto out_err; 407 } 408 409 cdev_device_del(&vol->cdev, &vol->dev); 410 put_device(&vol->dev); 411 412 spin_lock(&ubi->volumes_lock); 413 ubi->rsvd_pebs -= reserved_pebs; 414 ubi->avail_pebs += reserved_pebs; 415 ubi_update_reserved(ubi); 416 ubi->vol_count -= 1; 417 spin_unlock(&ubi->volumes_lock); 418 419 ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED); 420 if (!no_vtbl) 421 self_check_volumes(ubi); 422 423 return 0; 424 425out_err: 426 ubi_err(ubi, "cannot remove volume %d, error %d", vol_id, err); 427 spin_lock(&ubi->volumes_lock); 428 ubi->volumes[vol_id] = vol; 429out_unlock: 430 spin_unlock(&ubi->volumes_lock); 431 return err; 432} 433 434/** 435 * ubi_resize_volume - re-size volume. 436 * @desc: volume descriptor 437 * @reserved_pebs: new size in physical eraseblocks 438 * 439 * This function re-sizes the volume and returns zero in case of success, and a 440 * negative error code in case of failure. The caller has to have the 441 * @ubi->device_mutex locked. 442 */ 443int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) 444{ 445 int i, err, pebs; 446 struct ubi_volume *vol = desc->vol; 447 struct ubi_device *ubi = vol->ubi; 448 struct ubi_vtbl_record vtbl_rec; 449 struct ubi_eba_table *new_eba_tbl = NULL; 450 struct ubi_eba_table *old_eba_tbl = NULL; 451 int vol_id = vol->vol_id; 452 453 if (ubi->ro_mode) 454 return -EROFS; 455 456 dbg_gen("re-size device %d, volume %d to from %d to %d PEBs", 457 ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs); 458 459 if (vol->vol_type == UBI_STATIC_VOLUME && 460 reserved_pebs < vol->used_ebs) { 461 ubi_err(ubi, "too small size %d, %d LEBs contain data", 462 reserved_pebs, vol->used_ebs); 463 return -EINVAL; 464 } 465 466 /* If the size is the same, we have nothing to do */ 467 if (reserved_pebs == vol->reserved_pebs) 468 return 0; 469 470 new_eba_tbl = ubi_eba_create_table(vol, reserved_pebs); 471 if (IS_ERR(new_eba_tbl)) 472 return PTR_ERR(new_eba_tbl); 473 474 spin_lock(&ubi->volumes_lock); 475 if (vol->ref_count > 1) { 476 spin_unlock(&ubi->volumes_lock); 477 err = -EBUSY; 478 goto out_free; 479 } 480 spin_unlock(&ubi->volumes_lock); 481 482 /* Reserve physical eraseblocks */ 483 pebs = reserved_pebs - vol->reserved_pebs; 484 if (pebs > 0) { 485 spin_lock(&ubi->volumes_lock); 486 if (pebs > ubi->avail_pebs) { 487 ubi_err(ubi, "not enough PEBs: requested %d, available %d", 488 pebs, ubi->avail_pebs); 489 if (ubi->corr_peb_count) 490 ubi_err(ubi, "%d PEBs are corrupted and not used", 491 ubi->corr_peb_count); 492 spin_unlock(&ubi->volumes_lock); 493 err = -ENOSPC; 494 goto out_free; 495 } 496 497 ubi->avail_pebs -= pebs; 498 ubi->rsvd_pebs += pebs; 499 ubi_eba_copy_table(vol, new_eba_tbl, vol->reserved_pebs); 500 old_eba_tbl = vol->eba_tbl; 501 vol->eba_tbl = new_eba_tbl; 502 vol->reserved_pebs = reserved_pebs; 503 spin_unlock(&ubi->volumes_lock); 504 } 505 506 if (pebs < 0) { 507 for (i = 0; i < -pebs; i++) { 508 err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); 509 if (err) 510 goto out_free; 511 } 512 spin_lock(&ubi->volumes_lock); 513 ubi->rsvd_pebs += pebs; 514 ubi->avail_pebs -= pebs; 515 ubi_update_reserved(ubi); 516 ubi_eba_copy_table(vol, new_eba_tbl, reserved_pebs); 517 old_eba_tbl = vol->eba_tbl; 518 vol->eba_tbl = new_eba_tbl; 519 vol->reserved_pebs = reserved_pebs; 520 spin_unlock(&ubi->volumes_lock); 521 } 522 523 /* 524 * When we shrink a volume we have to flush all pending (erase) work. 525 * Otherwise it can happen that upon next attach UBI finds a LEB with 526 * lnum > highest_lnum and refuses to attach. 527 */ 528 if (pebs < 0) { 529 err = ubi_wl_flush(ubi, vol_id, UBI_ALL); 530 if (err) 531 goto out_acc; 532 } 533 534 /* Change volume table record */ 535 vtbl_rec = ubi->vtbl[vol_id]; 536 vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); 537 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); 538 if (err) 539 goto out_acc; 540 541 if (vol->vol_type == UBI_DYNAMIC_VOLUME) { 542 vol->used_ebs = reserved_pebs; 543 vol->last_eb_bytes = vol->usable_leb_size; 544 vol->used_bytes = 545 (long long)vol->used_ebs * vol->usable_leb_size; 546 } 547 548 /* destroy old table */ 549 ubi_eba_destroy_table(old_eba_tbl); 550 ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED); 551 self_check_volumes(ubi); 552 return err; 553 554out_acc: 555 spin_lock(&ubi->volumes_lock); 556 vol->reserved_pebs = reserved_pebs - pebs; 557 ubi->rsvd_pebs -= pebs; 558 ubi->avail_pebs += pebs; 559 if (pebs > 0) 560 ubi_eba_copy_table(vol, old_eba_tbl, vol->reserved_pebs); 561 else 562 ubi_eba_copy_table(vol, old_eba_tbl, reserved_pebs); 563 vol->eba_tbl = old_eba_tbl; 564 spin_unlock(&ubi->volumes_lock); 565out_free: 566 ubi_eba_destroy_table(new_eba_tbl); 567 return err; 568} 569 570/** 571 * ubi_rename_volumes - re-name UBI volumes. 572 * @ubi: UBI device description object 573 * @rename_list: list of &struct ubi_rename_entry objects 574 * 575 * This function re-names or removes volumes specified in the re-name list. 576 * Returns zero in case of success and a negative error code in case of 577 * failure. 578 */ 579int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) 580{ 581 int err; 582 struct ubi_rename_entry *re; 583 584 err = ubi_vtbl_rename_volumes(ubi, rename_list); 585 if (err) 586 return err; 587 588 list_for_each_entry(re, rename_list, list) { 589 if (re->remove) { 590 err = ubi_remove_volume(re->desc, 1); 591 if (err) 592 break; 593 } else { 594 struct ubi_volume *vol = re->desc->vol; 595 596 spin_lock(&ubi->volumes_lock); 597 vol->name_len = re->new_name_len; 598 memcpy(vol->name, re->new_name, re->new_name_len + 1); 599 spin_unlock(&ubi->volumes_lock); 600 ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED); 601 } 602 } 603 604 if (!err) 605 self_check_volumes(ubi); 606 return err; 607} 608 609/** 610 * ubi_add_volume - add volume. 611 * @ubi: UBI device description object 612 * @vol: volume description object 613 * 614 * This function adds an existing volume and initializes all its data 615 * structures. Returns zero in case of success and a negative error code in 616 * case of failure. 617 */ 618int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) 619{ 620 int err, vol_id = vol->vol_id; 621 dev_t dev; 622 623 dbg_gen("add volume %d", vol_id); 624 625 /* Register character device for the volume */ 626 cdev_init(&vol->cdev, &ubi_vol_cdev_operations); 627 vol->cdev.owner = THIS_MODULE; 628 dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); 629 err = cdev_add(&vol->cdev, dev, 1); 630 if (err) { 631 ubi_err(ubi, "cannot add character device for volume %d, error %d", 632 vol_id, err); 633 vol_release(&vol->dev); 634 return err; 635 } 636 637 vol->dev.release = vol_release; 638 vol->dev.parent = &ubi->dev; 639 vol->dev.devt = dev; 640 vol->dev.class = &ubi_class; 641 vol->dev.groups = volume_dev_groups; 642 dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); 643 device_set_node(&vol->dev, find_volume_fwnode(vol)); 644 err = device_register(&vol->dev); 645 if (err) { 646 cdev_del(&vol->cdev); 647 put_device(&vol->dev); 648 return err; 649 } 650 651 self_check_volumes(ubi); 652 return err; 653} 654 655/** 656 * ubi_free_volume - free volume. 657 * @ubi: UBI device description object 658 * @vol: volume description object 659 * 660 * This function frees all resources for volume @vol but does not remove it. 661 * Used only when the UBI device is detached. 662 */ 663void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) 664{ 665 dbg_gen("free volume %d", vol->vol_id); 666 667 ubi->volumes[vol->vol_id] = NULL; 668 cdev_del(&vol->cdev); 669 device_unregister(&vol->dev); 670} 671 672/** 673 * self_check_volume - check volume information. 674 * @ubi: UBI device description object 675 * @vol_id: volume ID 676 * 677 * Returns zero if volume is all right and a negative error code if not. 678 */ 679static int self_check_volume(struct ubi_device *ubi, int vol_id) 680{ 681 int idx = vol_id2idx(ubi, vol_id); 682 int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; 683 const struct ubi_volume *vol; 684 long long n; 685 const char *name; 686 687 spin_lock(&ubi->volumes_lock); 688 reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); 689 vol = ubi->volumes[idx]; 690 691 if (!vol) { 692 if (reserved_pebs) { 693 ubi_err(ubi, "no volume info, but volume exists"); 694 goto fail; 695 } 696 spin_unlock(&ubi->volumes_lock); 697 return 0; 698 } 699 700 if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || 701 vol->name_len < 0) { 702 ubi_err(ubi, "negative values"); 703 goto fail; 704 } 705 if (vol->alignment > ubi->leb_size || vol->alignment == 0) { 706 ubi_err(ubi, "bad alignment"); 707 goto fail; 708 } 709 710 n = vol->alignment & (ubi->min_io_size - 1); 711 if (vol->alignment != 1 && n) { 712 ubi_err(ubi, "alignment is not multiple of min I/O unit"); 713 goto fail; 714 } 715 716 n = ubi->leb_size % vol->alignment; 717 if (vol->data_pad != n) { 718 ubi_err(ubi, "bad data_pad, has to be %lld", n); 719 goto fail; 720 } 721 722 if (vol->vol_type != UBI_DYNAMIC_VOLUME && 723 vol->vol_type != UBI_STATIC_VOLUME) { 724 ubi_err(ubi, "bad vol_type"); 725 goto fail; 726 } 727 728 if (vol->upd_marker && vol->corrupted) { 729 ubi_err(ubi, "update marker and corrupted simultaneously"); 730 goto fail; 731 } 732 733 if (vol->reserved_pebs > ubi->good_peb_count) { 734 ubi_err(ubi, "too large reserved_pebs"); 735 goto fail; 736 } 737 738 n = ubi->leb_size - vol->data_pad; 739 if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { 740 ubi_err(ubi, "bad usable_leb_size, has to be %lld", n); 741 goto fail; 742 } 743 744 if (vol->name_len > UBI_VOL_NAME_MAX) { 745 ubi_err(ubi, "too long volume name, max is %d", 746 UBI_VOL_NAME_MAX); 747 goto fail; 748 } 749 750 n = strnlen(vol->name, vol->name_len + 1); 751 if (n != vol->name_len) { 752 ubi_err(ubi, "bad name_len %lld", n); 753 goto fail; 754 } 755 756 n = (long long)vol->used_ebs * vol->usable_leb_size; 757 if (vol->vol_type == UBI_DYNAMIC_VOLUME) { 758 if (vol->corrupted) { 759 ubi_err(ubi, "corrupted dynamic volume"); 760 goto fail; 761 } 762 if (vol->used_ebs != vol->reserved_pebs) { 763 ubi_err(ubi, "bad used_ebs"); 764 goto fail; 765 } 766 if (vol->last_eb_bytes != vol->usable_leb_size) { 767 ubi_err(ubi, "bad last_eb_bytes"); 768 goto fail; 769 } 770 if (vol->used_bytes != n) { 771 ubi_err(ubi, "bad used_bytes"); 772 goto fail; 773 } 774 775 if (vol->skip_check) { 776 ubi_err(ubi, "bad skip_check"); 777 goto fail; 778 } 779 } else { 780 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { 781 ubi_err(ubi, "bad used_ebs"); 782 goto fail; 783 } 784 if (vol->last_eb_bytes < 0 || 785 vol->last_eb_bytes > vol->usable_leb_size) { 786 ubi_err(ubi, "bad last_eb_bytes"); 787 goto fail; 788 } 789 if (vol->used_bytes < 0 || vol->used_bytes > n || 790 vol->used_bytes < n - vol->usable_leb_size) { 791 ubi_err(ubi, "bad used_bytes"); 792 goto fail; 793 } 794 } 795 796 alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); 797 data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); 798 name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); 799 upd_marker = ubi->vtbl[vol_id].upd_marker; 800 name = &ubi->vtbl[vol_id].name[0]; 801 if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) 802 vol_type = UBI_DYNAMIC_VOLUME; 803 else 804 vol_type = UBI_STATIC_VOLUME; 805 806 if (alignment != vol->alignment || data_pad != vol->data_pad || 807 upd_marker != vol->upd_marker || vol_type != vol->vol_type || 808 name_len != vol->name_len || strncmp(name, vol->name, name_len)) { 809 ubi_err(ubi, "volume info is different"); 810 goto fail; 811 } 812 813 spin_unlock(&ubi->volumes_lock); 814 return 0; 815 816fail: 817 ubi_err(ubi, "self-check failed for volume %d", vol_id); 818 if (vol) 819 ubi_dump_vol_info(vol); 820 ubi_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); 821 dump_stack(); 822 spin_unlock(&ubi->volumes_lock); 823 return -EINVAL; 824} 825 826/** 827 * self_check_volumes - check information about all volumes. 828 * @ubi: UBI device description object 829 * 830 * Returns zero if volumes are all right and a negative error code if not. 831 */ 832static int self_check_volumes(struct ubi_device *ubi) 833{ 834 int i, err = 0; 835 836 if (!ubi_dbg_chk_gen(ubi)) 837 return 0; 838 839 for (i = 0; i < ubi->vtbl_slots; i++) { 840 err = self_check_volume(ubi, i); 841 if (err) 842 break; 843 } 844 845 return err; 846} 847