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 includes implementation of UBI character device operations. 23 * 24 * There are two kinds of character devices in UBI: UBI character devices and 25 * UBI volume character devices. UBI character devices allow users to 26 * manipulate whole volumes: create, remove, and re-size them. Volume character 27 * devices provide volume I/O capabilities. 28 * 29 * Major and minor numbers are assigned dynamically to both UBI and volume 30 * character devices. 31 * 32 * Well, there is the third kind of character devices - the UBI control 33 * character device, which allows to manipulate by UBI devices - create and 34 * delete them. In other words, it is used for attaching and detaching MTD 35 * devices. 36 */ 37 38 #include <linux/module.h> 39 #include <linux/stat.h> 40 #include <linux/slab.h> 41 #include <linux/ioctl.h> 42 #include <linux/capability.h> 43 #include <linux/uaccess.h> 44 #include <linux/compat.h> 45 #include <linux/math64.h> 46 #include <mtd/ubi-user.h> 47 #include "ubi.h" 48 49 /** 50 * get_exclusive - get exclusive access to an UBI volume. 51 * @desc: volume descriptor 52 * 53 * This function changes UBI volume open mode to "exclusive". Returns previous 54 * mode value (positive integer) in case of success and a negative error code 55 * in case of failure. 56 */ 57 static int get_exclusive(struct ubi_volume_desc *desc) 58 { 59 int users, err; 60 struct ubi_volume *vol = desc->vol; 61 62 spin_lock(&vol->ubi->volumes_lock); 63 users = vol->readers + vol->writers + vol->exclusive; 64 ubi_assert(users > 0); 65 if (users > 1) { 66 ubi_err("%d users for volume %d", users, vol->vol_id); 67 err = -EBUSY; 68 } else { 69 vol->readers = vol->writers = 0; 70 vol->exclusive = 1; 71 err = desc->mode; 72 desc->mode = UBI_EXCLUSIVE; 73 } 74 spin_unlock(&vol->ubi->volumes_lock); 75 76 return err; 77 } 78 79 /** 80 * revoke_exclusive - revoke exclusive mode. 81 * @desc: volume descriptor 82 * @mode: new mode to switch to 83 */ 84 static void revoke_exclusive(struct ubi_volume_desc *desc, int mode) 85 { 86 struct ubi_volume *vol = desc->vol; 87 88 spin_lock(&vol->ubi->volumes_lock); 89 ubi_assert(vol->readers == 0 && vol->writers == 0); 90 ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE); 91 vol->exclusive = 0; 92 if (mode == UBI_READONLY) 93 vol->readers = 1; 94 else if (mode == UBI_READWRITE) 95 vol->writers = 1; 96 else 97 vol->exclusive = 1; 98 spin_unlock(&vol->ubi->volumes_lock); 99 100 desc->mode = mode; 101 } 102 103 static int vol_cdev_open(struct inode *inode, struct file *file) 104 { 105 struct ubi_volume_desc *desc; 106 int vol_id = iminor(inode) - 1, mode, ubi_num; 107 108 ubi_num = ubi_major2num(imajor(inode)); 109 if (ubi_num < 0) 110 return ubi_num; 111 112 if (file->f_mode & FMODE_WRITE) 113 mode = UBI_READWRITE; 114 else 115 mode = UBI_READONLY; 116 117 dbg_gen("open device %d, volume %d, mode %d", 118 ubi_num, vol_id, mode); 119 120 desc = ubi_open_volume(ubi_num, vol_id, mode); 121 if (IS_ERR(desc)) 122 return PTR_ERR(desc); 123 124 file->private_data = desc; 125 return 0; 126 } 127 128 static int vol_cdev_release(struct inode *inode, struct file *file) 129 { 130 struct ubi_volume_desc *desc = file->private_data; 131 struct ubi_volume *vol = desc->vol; 132 133 dbg_gen("release device %d, volume %d, mode %d", 134 vol->ubi->ubi_num, vol->vol_id, desc->mode); 135 136 if (vol->updating) { 137 ubi_warn("update of volume %d not finished, volume is damaged", 138 vol->vol_id); 139 ubi_assert(!vol->changing_leb); 140 vol->updating = 0; 141 vfree(vol->upd_buf); 142 } else if (vol->changing_leb) { 143 dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel", 144 vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num, 145 vol->vol_id); 146 vol->changing_leb = 0; 147 vfree(vol->upd_buf); 148 } 149 150 ubi_close_volume(desc); 151 return 0; 152 } 153 154 static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin) 155 { 156 struct ubi_volume_desc *desc = file->private_data; 157 struct ubi_volume *vol = desc->vol; 158 159 if (vol->updating) { 160 /* Update is in progress, seeking is prohibited */ 161 ubi_err("updating"); 162 return -EBUSY; 163 } 164 165 return fixed_size_llseek(file, offset, origin, vol->used_bytes); 166 } 167 168 static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, 169 int datasync) 170 { 171 struct ubi_volume_desc *desc = file->private_data; 172 struct ubi_device *ubi = desc->vol->ubi; 173 struct inode *inode = file_inode(file); 174 int err; 175 mutex_lock(&inode->i_mutex); 176 err = ubi_sync(ubi->ubi_num); 177 mutex_unlock(&inode->i_mutex); 178 return err; 179 } 180 181 182 static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count, 183 loff_t *offp) 184 { 185 struct ubi_volume_desc *desc = file->private_data; 186 struct ubi_volume *vol = desc->vol; 187 struct ubi_device *ubi = vol->ubi; 188 int err, lnum, off, len, tbuf_size; 189 size_t count_save = count; 190 void *tbuf; 191 192 dbg_gen("read %zd bytes from offset %lld of volume %d", 193 count, *offp, vol->vol_id); 194 195 if (vol->updating) { 196 ubi_err("updating"); 197 return -EBUSY; 198 } 199 if (vol->upd_marker) { 200 ubi_err("damaged volume, update marker is set"); 201 return -EBADF; 202 } 203 if (*offp == vol->used_bytes || count == 0) 204 return 0; 205 206 if (vol->corrupted) 207 dbg_gen("read from corrupted volume %d", vol->vol_id); 208 209 if (*offp + count > vol->used_bytes) 210 count_save = count = vol->used_bytes - *offp; 211 212 tbuf_size = vol->usable_leb_size; 213 if (count < tbuf_size) 214 tbuf_size = ALIGN(count, ubi->min_io_size); 215 tbuf = vmalloc(tbuf_size); 216 if (!tbuf) 217 return -ENOMEM; 218 219 len = count > tbuf_size ? tbuf_size : count; 220 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); 221 222 do { 223 cond_resched(); 224 225 if (off + len >= vol->usable_leb_size) 226 len = vol->usable_leb_size - off; 227 228 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0); 229 if (err) 230 break; 231 232 off += len; 233 if (off == vol->usable_leb_size) { 234 lnum += 1; 235 off -= vol->usable_leb_size; 236 } 237 238 count -= len; 239 *offp += len; 240 241 err = copy_to_user(buf, tbuf, len); 242 if (err) { 243 err = -EFAULT; 244 break; 245 } 246 247 buf += len; 248 len = count > tbuf_size ? tbuf_size : count; 249 } while (count); 250 251 vfree(tbuf); 252 return err ? err : count_save - count; 253 } 254 255 /* 256 * This function allows to directly write to dynamic UBI volumes, without 257 * issuing the volume update operation. 258 */ 259 static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf, 260 size_t count, loff_t *offp) 261 { 262 struct ubi_volume_desc *desc = file->private_data; 263 struct ubi_volume *vol = desc->vol; 264 struct ubi_device *ubi = vol->ubi; 265 int lnum, off, len, tbuf_size, err = 0; 266 size_t count_save = count; 267 char *tbuf; 268 269 if (!vol->direct_writes) 270 return -EPERM; 271 272 dbg_gen("requested: write %zd bytes to offset %lld of volume %u", 273 count, *offp, vol->vol_id); 274 275 if (vol->vol_type == UBI_STATIC_VOLUME) 276 return -EROFS; 277 278 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off); 279 if (off & (ubi->min_io_size - 1)) { 280 ubi_err("unaligned position"); 281 return -EINVAL; 282 } 283 284 if (*offp + count > vol->used_bytes) 285 count_save = count = vol->used_bytes - *offp; 286 287 /* We can write only in fractions of the minimum I/O unit */ 288 if (count & (ubi->min_io_size - 1)) { 289 ubi_err("unaligned write length"); 290 return -EINVAL; 291 } 292 293 tbuf_size = vol->usable_leb_size; 294 if (count < tbuf_size) 295 tbuf_size = ALIGN(count, ubi->min_io_size); 296 tbuf = vmalloc(tbuf_size); 297 if (!tbuf) 298 return -ENOMEM; 299 300 len = count > tbuf_size ? tbuf_size : count; 301 302 while (count) { 303 cond_resched(); 304 305 if (off + len >= vol->usable_leb_size) 306 len = vol->usable_leb_size - off; 307 308 err = copy_from_user(tbuf, buf, len); 309 if (err) { 310 err = -EFAULT; 311 break; 312 } 313 314 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len); 315 if (err) 316 break; 317 318 off += len; 319 if (off == vol->usable_leb_size) { 320 lnum += 1; 321 off -= vol->usable_leb_size; 322 } 323 324 count -= len; 325 *offp += len; 326 buf += len; 327 len = count > tbuf_size ? tbuf_size : count; 328 } 329 330 vfree(tbuf); 331 return err ? err : count_save - count; 332 } 333 334 static ssize_t vol_cdev_write(struct file *file, const char __user *buf, 335 size_t count, loff_t *offp) 336 { 337 int err = 0; 338 struct ubi_volume_desc *desc = file->private_data; 339 struct ubi_volume *vol = desc->vol; 340 struct ubi_device *ubi = vol->ubi; 341 342 if (!vol->updating && !vol->changing_leb) 343 return vol_cdev_direct_write(file, buf, count, offp); 344 345 if (vol->updating) 346 err = ubi_more_update_data(ubi, vol, buf, count); 347 else 348 err = ubi_more_leb_change_data(ubi, vol, buf, count); 349 350 if (err < 0) { 351 ubi_err("cannot accept more %zd bytes of data, error %d", 352 count, err); 353 return err; 354 } 355 356 if (err) { 357 /* 358 * The operation is finished, @err contains number of actually 359 * written bytes. 360 */ 361 count = err; 362 363 if (vol->changing_leb) { 364 revoke_exclusive(desc, UBI_READWRITE); 365 return count; 366 } 367 368 err = ubi_check_volume(ubi, vol->vol_id); 369 if (err < 0) 370 return err; 371 372 if (err) { 373 ubi_warn("volume %d on UBI device %d is corrupted", 374 vol->vol_id, ubi->ubi_num); 375 vol->corrupted = 1; 376 } 377 vol->checked = 1; 378 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED); 379 revoke_exclusive(desc, UBI_READWRITE); 380 } 381 382 return count; 383 } 384 385 static long vol_cdev_ioctl(struct file *file, unsigned int cmd, 386 unsigned long arg) 387 { 388 int err = 0; 389 struct ubi_volume_desc *desc = file->private_data; 390 struct ubi_volume *vol = desc->vol; 391 struct ubi_device *ubi = vol->ubi; 392 void __user *argp = (void __user *)arg; 393 394 switch (cmd) { 395 /* Volume update command */ 396 case UBI_IOCVOLUP: 397 { 398 int64_t bytes, rsvd_bytes; 399 400 if (!capable(CAP_SYS_RESOURCE)) { 401 err = -EPERM; 402 break; 403 } 404 405 err = copy_from_user(&bytes, argp, sizeof(int64_t)); 406 if (err) { 407 err = -EFAULT; 408 break; 409 } 410 411 if (desc->mode == UBI_READONLY) { 412 err = -EROFS; 413 break; 414 } 415 416 rsvd_bytes = (long long)vol->reserved_pebs * 417 ubi->leb_size-vol->data_pad; 418 if (bytes < 0 || bytes > rsvd_bytes) { 419 err = -EINVAL; 420 break; 421 } 422 423 err = get_exclusive(desc); 424 if (err < 0) 425 break; 426 427 err = ubi_start_update(ubi, vol, bytes); 428 if (bytes == 0) 429 revoke_exclusive(desc, UBI_READWRITE); 430 break; 431 } 432 433 /* Atomic logical eraseblock change command */ 434 case UBI_IOCEBCH: 435 { 436 struct ubi_leb_change_req req; 437 438 err = copy_from_user(&req, argp, 439 sizeof(struct ubi_leb_change_req)); 440 if (err) { 441 err = -EFAULT; 442 break; 443 } 444 445 if (desc->mode == UBI_READONLY || 446 vol->vol_type == UBI_STATIC_VOLUME) { 447 err = -EROFS; 448 break; 449 } 450 451 /* Validate the request */ 452 err = -EINVAL; 453 if (req.lnum < 0 || req.lnum >= vol->reserved_pebs || 454 req.bytes < 0 || req.lnum >= vol->usable_leb_size) 455 break; 456 457 err = get_exclusive(desc); 458 if (err < 0) 459 break; 460 461 err = ubi_start_leb_change(ubi, vol, &req); 462 if (req.bytes == 0) 463 revoke_exclusive(desc, UBI_READWRITE); 464 break; 465 } 466 467 /* Logical eraseblock erasure command */ 468 case UBI_IOCEBER: 469 { 470 int32_t lnum; 471 472 err = get_user(lnum, (__user int32_t *)argp); 473 if (err) { 474 err = -EFAULT; 475 break; 476 } 477 478 if (desc->mode == UBI_READONLY || 479 vol->vol_type == UBI_STATIC_VOLUME) { 480 err = -EROFS; 481 break; 482 } 483 484 if (lnum < 0 || lnum >= vol->reserved_pebs) { 485 err = -EINVAL; 486 break; 487 } 488 489 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum); 490 err = ubi_eba_unmap_leb(ubi, vol, lnum); 491 if (err) 492 break; 493 494 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL); 495 break; 496 } 497 498 /* Logical eraseblock map command */ 499 case UBI_IOCEBMAP: 500 { 501 struct ubi_map_req req; 502 503 err = copy_from_user(&req, argp, sizeof(struct ubi_map_req)); 504 if (err) { 505 err = -EFAULT; 506 break; 507 } 508 err = ubi_leb_map(desc, req.lnum); 509 break; 510 } 511 512 /* Logical eraseblock un-map command */ 513 case UBI_IOCEBUNMAP: 514 { 515 int32_t lnum; 516 517 err = get_user(lnum, (__user int32_t *)argp); 518 if (err) { 519 err = -EFAULT; 520 break; 521 } 522 err = ubi_leb_unmap(desc, lnum); 523 break; 524 } 525 526 /* Check if logical eraseblock is mapped command */ 527 case UBI_IOCEBISMAP: 528 { 529 int32_t lnum; 530 531 err = get_user(lnum, (__user int32_t *)argp); 532 if (err) { 533 err = -EFAULT; 534 break; 535 } 536 err = ubi_is_mapped(desc, lnum); 537 break; 538 } 539 540 /* Set volume property command */ 541 case UBI_IOCSETVOLPROP: 542 { 543 struct ubi_set_vol_prop_req req; 544 545 err = copy_from_user(&req, argp, 546 sizeof(struct ubi_set_vol_prop_req)); 547 if (err) { 548 err = -EFAULT; 549 break; 550 } 551 switch (req.property) { 552 case UBI_VOL_PROP_DIRECT_WRITE: 553 mutex_lock(&ubi->device_mutex); 554 desc->vol->direct_writes = !!req.value; 555 mutex_unlock(&ubi->device_mutex); 556 break; 557 default: 558 err = -EINVAL; 559 break; 560 } 561 break; 562 } 563 564 default: 565 err = -ENOTTY; 566 break; 567 } 568 return err; 569 } 570 571 /** 572 * verify_mkvol_req - verify volume creation request. 573 * @ubi: UBI device description object 574 * @req: the request to check 575 * 576 * This function zero if the request is correct, and %-EINVAL if not. 577 */ 578 static int verify_mkvol_req(const struct ubi_device *ubi, 579 const struct ubi_mkvol_req *req) 580 { 581 int n, err = -EINVAL; 582 583 if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 || 584 req->name_len < 0) 585 goto bad; 586 587 if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) && 588 req->vol_id != UBI_VOL_NUM_AUTO) 589 goto bad; 590 591 if (req->alignment == 0) 592 goto bad; 593 594 if (req->bytes == 0) 595 goto bad; 596 597 if (req->vol_type != UBI_DYNAMIC_VOLUME && 598 req->vol_type != UBI_STATIC_VOLUME) 599 goto bad; 600 601 if (req->alignment > ubi->leb_size) 602 goto bad; 603 604 n = req->alignment & (ubi->min_io_size - 1); 605 if (req->alignment != 1 && n) 606 goto bad; 607 608 if (!req->name[0] || !req->name_len) 609 goto bad; 610 611 if (req->name_len > UBI_VOL_NAME_MAX) { 612 err = -ENAMETOOLONG; 613 goto bad; 614 } 615 616 n = strnlen(req->name, req->name_len + 1); 617 if (n != req->name_len) 618 goto bad; 619 620 return 0; 621 622 bad: 623 ubi_err("bad volume creation request"); 624 ubi_dump_mkvol_req(req); 625 return err; 626 } 627 628 /** 629 * verify_rsvol_req - verify volume re-size request. 630 * @ubi: UBI device description object 631 * @req: the request to check 632 * 633 * This function returns zero if the request is correct, and %-EINVAL if not. 634 */ 635 static int verify_rsvol_req(const struct ubi_device *ubi, 636 const struct ubi_rsvol_req *req) 637 { 638 if (req->bytes <= 0) 639 return -EINVAL; 640 641 if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) 642 return -EINVAL; 643 644 return 0; 645 } 646 647 /** 648 * rename_volumes - rename UBI volumes. 649 * @ubi: UBI device description object 650 * @req: volumes re-name request 651 * 652 * This is a helper function for the volume re-name IOCTL which validates the 653 * the request, opens the volume and calls corresponding volumes management 654 * function. Returns zero in case of success and a negative error code in case 655 * of failure. 656 */ 657 static int rename_volumes(struct ubi_device *ubi, 658 struct ubi_rnvol_req *req) 659 { 660 int i, n, err; 661 struct list_head rename_list; 662 struct ubi_rename_entry *re, *re1; 663 664 if (req->count < 0 || req->count > UBI_MAX_RNVOL) 665 return -EINVAL; 666 667 if (req->count == 0) 668 return 0; 669 670 /* Validate volume IDs and names in the request */ 671 for (i = 0; i < req->count; i++) { 672 if (req->ents[i].vol_id < 0 || 673 req->ents[i].vol_id >= ubi->vtbl_slots) 674 return -EINVAL; 675 if (req->ents[i].name_len < 0) 676 return -EINVAL; 677 if (req->ents[i].name_len > UBI_VOL_NAME_MAX) 678 return -ENAMETOOLONG; 679 req->ents[i].name[req->ents[i].name_len] = '\0'; 680 n = strlen(req->ents[i].name); 681 if (n != req->ents[i].name_len) 682 err = -EINVAL; 683 } 684 685 /* Make sure volume IDs and names are unique */ 686 for (i = 0; i < req->count - 1; i++) { 687 for (n = i + 1; n < req->count; n++) { 688 if (req->ents[i].vol_id == req->ents[n].vol_id) { 689 ubi_err("duplicated volume id %d", 690 req->ents[i].vol_id); 691 return -EINVAL; 692 } 693 if (!strcmp(req->ents[i].name, req->ents[n].name)) { 694 ubi_err("duplicated volume name \"%s\"", 695 req->ents[i].name); 696 return -EINVAL; 697 } 698 } 699 } 700 701 /* Create the re-name list */ 702 INIT_LIST_HEAD(&rename_list); 703 for (i = 0; i < req->count; i++) { 704 int vol_id = req->ents[i].vol_id; 705 int name_len = req->ents[i].name_len; 706 const char *name = req->ents[i].name; 707 708 re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); 709 if (!re) { 710 err = -ENOMEM; 711 goto out_free; 712 } 713 714 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); 715 if (IS_ERR(re->desc)) { 716 err = PTR_ERR(re->desc); 717 ubi_err("cannot open volume %d, error %d", vol_id, err); 718 kfree(re); 719 goto out_free; 720 } 721 722 /* Skip this re-naming if the name does not really change */ 723 if (re->desc->vol->name_len == name_len && 724 !memcmp(re->desc->vol->name, name, name_len)) { 725 ubi_close_volume(re->desc); 726 kfree(re); 727 continue; 728 } 729 730 re->new_name_len = name_len; 731 memcpy(re->new_name, name, name_len); 732 list_add_tail(&re->list, &rename_list); 733 dbg_gen("will rename volume %d from \"%s\" to \"%s\"", 734 vol_id, re->desc->vol->name, name); 735 } 736 737 if (list_empty(&rename_list)) 738 return 0; 739 740 /* Find out the volumes which have to be removed */ 741 list_for_each_entry(re, &rename_list, list) { 742 struct ubi_volume_desc *desc; 743 int no_remove_needed = 0; 744 745 /* 746 * Volume @re->vol_id is going to be re-named to 747 * @re->new_name, while its current name is @name. If a volume 748 * with name @re->new_name currently exists, it has to be 749 * removed, unless it is also re-named in the request (@req). 750 */ 751 list_for_each_entry(re1, &rename_list, list) { 752 if (re->new_name_len == re1->desc->vol->name_len && 753 !memcmp(re->new_name, re1->desc->vol->name, 754 re1->desc->vol->name_len)) { 755 no_remove_needed = 1; 756 break; 757 } 758 } 759 760 if (no_remove_needed) 761 continue; 762 763 /* 764 * It seems we need to remove volume with name @re->new_name, 765 * if it exists. 766 */ 767 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name, 768 UBI_EXCLUSIVE); 769 if (IS_ERR(desc)) { 770 err = PTR_ERR(desc); 771 if (err == -ENODEV) 772 /* Re-naming into a non-existing volume name */ 773 continue; 774 775 /* The volume exists but busy, or an error occurred */ 776 ubi_err("cannot open volume \"%s\", error %d", 777 re->new_name, err); 778 goto out_free; 779 } 780 781 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL); 782 if (!re1) { 783 err = -ENOMEM; 784 ubi_close_volume(desc); 785 goto out_free; 786 } 787 788 re1->remove = 1; 789 re1->desc = desc; 790 list_add(&re1->list, &rename_list); 791 dbg_gen("will remove volume %d, name \"%s\"", 792 re1->desc->vol->vol_id, re1->desc->vol->name); 793 } 794 795 mutex_lock(&ubi->device_mutex); 796 err = ubi_rename_volumes(ubi, &rename_list); 797 mutex_unlock(&ubi->device_mutex); 798 799 out_free: 800 list_for_each_entry_safe(re, re1, &rename_list, list) { 801 ubi_close_volume(re->desc); 802 list_del(&re->list); 803 kfree(re); 804 } 805 return err; 806 } 807 808 static long ubi_cdev_ioctl(struct file *file, unsigned int cmd, 809 unsigned long arg) 810 { 811 int err = 0; 812 struct ubi_device *ubi; 813 struct ubi_volume_desc *desc; 814 void __user *argp = (void __user *)arg; 815 816 if (!capable(CAP_SYS_RESOURCE)) 817 return -EPERM; 818 819 ubi = ubi_get_by_major(imajor(file->f_mapping->host)); 820 if (!ubi) 821 return -ENODEV; 822 823 switch (cmd) { 824 /* Create volume command */ 825 case UBI_IOCMKVOL: 826 { 827 struct ubi_mkvol_req req; 828 829 dbg_gen("create volume"); 830 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req)); 831 if (err) { 832 err = -EFAULT; 833 break; 834 } 835 836 err = verify_mkvol_req(ubi, &req); 837 if (err) 838 break; 839 840 mutex_lock(&ubi->device_mutex); 841 err = ubi_create_volume(ubi, &req); 842 mutex_unlock(&ubi->device_mutex); 843 if (err) 844 break; 845 846 err = put_user(req.vol_id, (__user int32_t *)argp); 847 if (err) 848 err = -EFAULT; 849 850 break; 851 } 852 853 /* Remove volume command */ 854 case UBI_IOCRMVOL: 855 { 856 int vol_id; 857 858 dbg_gen("remove volume"); 859 err = get_user(vol_id, (__user int32_t *)argp); 860 if (err) { 861 err = -EFAULT; 862 break; 863 } 864 865 desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE); 866 if (IS_ERR(desc)) { 867 err = PTR_ERR(desc); 868 break; 869 } 870 871 mutex_lock(&ubi->device_mutex); 872 err = ubi_remove_volume(desc, 0); 873 mutex_unlock(&ubi->device_mutex); 874 875 /* 876 * The volume is deleted (unless an error occurred), and the 877 * 'struct ubi_volume' object will be freed when 878 * 'ubi_close_volume()' will call 'put_device()'. 879 */ 880 ubi_close_volume(desc); 881 break; 882 } 883 884 /* Re-size volume command */ 885 case UBI_IOCRSVOL: 886 { 887 int pebs; 888 struct ubi_rsvol_req req; 889 890 dbg_gen("re-size volume"); 891 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req)); 892 if (err) { 893 err = -EFAULT; 894 break; 895 } 896 897 err = verify_rsvol_req(ubi, &req); 898 if (err) 899 break; 900 901 desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE); 902 if (IS_ERR(desc)) { 903 err = PTR_ERR(desc); 904 break; 905 } 906 907 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1, 908 desc->vol->usable_leb_size); 909 910 mutex_lock(&ubi->device_mutex); 911 err = ubi_resize_volume(desc, pebs); 912 mutex_unlock(&ubi->device_mutex); 913 ubi_close_volume(desc); 914 break; 915 } 916 917 /* Re-name volumes command */ 918 case UBI_IOCRNVOL: 919 { 920 struct ubi_rnvol_req *req; 921 922 dbg_gen("re-name volumes"); 923 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL); 924 if (!req) { 925 err = -ENOMEM; 926 break; 927 }; 928 929 err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req)); 930 if (err) { 931 err = -EFAULT; 932 kfree(req); 933 break; 934 } 935 936 err = rename_volumes(ubi, req); 937 kfree(req); 938 break; 939 } 940 941 default: 942 err = -ENOTTY; 943 break; 944 } 945 946 ubi_put_device(ubi); 947 return err; 948 } 949 950 static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd, 951 unsigned long arg) 952 { 953 int err = 0; 954 void __user *argp = (void __user *)arg; 955 956 if (!capable(CAP_SYS_RESOURCE)) 957 return -EPERM; 958 959 switch (cmd) { 960 /* Attach an MTD device command */ 961 case UBI_IOCATT: 962 { 963 struct ubi_attach_req req; 964 struct mtd_info *mtd; 965 966 dbg_gen("attach MTD device"); 967 err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req)); 968 if (err) { 969 err = -EFAULT; 970 break; 971 } 972 973 if (req.mtd_num < 0 || 974 (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) { 975 err = -EINVAL; 976 break; 977 } 978 979 mtd = get_mtd_device(NULL, req.mtd_num); 980 if (IS_ERR(mtd)) { 981 err = PTR_ERR(mtd); 982 break; 983 } 984 985 /* 986 * Note, further request verification is done by 987 * 'ubi_attach_mtd_dev()'. 988 */ 989 mutex_lock(&ubi_devices_mutex); 990 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset, 991 req.max_beb_per1024); 992 mutex_unlock(&ubi_devices_mutex); 993 if (err < 0) 994 put_mtd_device(mtd); 995 else 996 /* @err contains UBI device number */ 997 err = put_user(err, (__user int32_t *)argp); 998 999 break; 1000 } 1001 1002 /* Detach an MTD device command */ 1003 case UBI_IOCDET: 1004 { 1005 int ubi_num; 1006 1007 dbg_gen("detach MTD device"); 1008 err = get_user(ubi_num, (__user int32_t *)argp); 1009 if (err) { 1010 err = -EFAULT; 1011 break; 1012 } 1013 1014 mutex_lock(&ubi_devices_mutex); 1015 err = ubi_detach_mtd_dev(ubi_num, 0); 1016 mutex_unlock(&ubi_devices_mutex); 1017 break; 1018 } 1019 1020 default: 1021 err = -ENOTTY; 1022 break; 1023 } 1024 1025 return err; 1026 } 1027 1028 #ifdef CONFIG_COMPAT 1029 static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd, 1030 unsigned long arg) 1031 { 1032 unsigned long translated_arg = (unsigned long)compat_ptr(arg); 1033 1034 return vol_cdev_ioctl(file, cmd, translated_arg); 1035 } 1036 1037 static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd, 1038 unsigned long arg) 1039 { 1040 unsigned long translated_arg = (unsigned long)compat_ptr(arg); 1041 1042 return ubi_cdev_ioctl(file, cmd, translated_arg); 1043 } 1044 1045 static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd, 1046 unsigned long arg) 1047 { 1048 unsigned long translated_arg = (unsigned long)compat_ptr(arg); 1049 1050 return ctrl_cdev_ioctl(file, cmd, translated_arg); 1051 } 1052 #else 1053 #define vol_cdev_compat_ioctl NULL 1054 #define ubi_cdev_compat_ioctl NULL 1055 #define ctrl_cdev_compat_ioctl NULL 1056 #endif 1057 1058 /* UBI volume character device operations */ 1059 const struct file_operations ubi_vol_cdev_operations = { 1060 .owner = THIS_MODULE, 1061 .open = vol_cdev_open, 1062 .release = vol_cdev_release, 1063 .llseek = vol_cdev_llseek, 1064 .read = vol_cdev_read, 1065 .write = vol_cdev_write, 1066 .fsync = vol_cdev_fsync, 1067 .unlocked_ioctl = vol_cdev_ioctl, 1068 .compat_ioctl = vol_cdev_compat_ioctl, 1069 }; 1070 1071 /* UBI character device operations */ 1072 const struct file_operations ubi_cdev_operations = { 1073 .owner = THIS_MODULE, 1074 .llseek = no_llseek, 1075 .unlocked_ioctl = ubi_cdev_ioctl, 1076 .compat_ioctl = ubi_cdev_compat_ioctl, 1077 }; 1078 1079 /* UBI control character device operations */ 1080 const struct file_operations ubi_ctrl_cdev_operations = { 1081 .owner = THIS_MODULE, 1082 .unlocked_ioctl = ctrl_cdev_ioctl, 1083 .compat_ioctl = ctrl_cdev_compat_ioctl, 1084 .llseek = no_llseek, 1085 }; 1086