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