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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (c) International Business Machines Corp., 20064 *5 * Author: Artem Bityutskiy (Битюцкий Артём)6 */7 8/*9 * This file includes implementation of UBI character device operations.10 *11 * There are two kinds of character devices in UBI: UBI character devices and12 * UBI volume character devices. UBI character devices allow users to13 * manipulate whole volumes: create, remove, and re-size them. Volume character14 * devices provide volume I/O capabilities.15 *16 * Major and minor numbers are assigned dynamically to both UBI and volume17 * character devices.18 *19 * Well, there is the third kind of character devices - the UBI control20 * character device, which allows to manipulate by UBI devices - create and21 * delete them. In other words, it is used for attaching and detaching MTD22 * devices.23 */24 25#include <linux/module.h>26#include <linux/stat.h>27#include <linux/slab.h>28#include <linux/ioctl.h>29#include <linux/capability.h>30#include <linux/uaccess.h>31#include <linux/compat.h>32#include <linux/math64.h>33#include <mtd/ubi-user.h>34#include "ubi.h"35 36/**37 * get_exclusive - get exclusive access to an UBI volume.38 * @desc: volume descriptor39 *40 * This function changes UBI volume open mode to "exclusive". Returns previous41 * mode value (positive integer) in case of success and a negative error code42 * in case of failure.43 */44static int get_exclusive(struct ubi_volume_desc *desc)45{46 int users, err;47 struct ubi_volume *vol = desc->vol;48 49 spin_lock(&vol->ubi->volumes_lock);50 users = vol->readers + vol->writers + vol->exclusive + vol->metaonly;51 ubi_assert(users > 0);52 if (users > 1) {53 ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id);54 err = -EBUSY;55 } else {56 vol->readers = vol->writers = vol->metaonly = 0;57 vol->exclusive = 1;58 err = desc->mode;59 desc->mode = UBI_EXCLUSIVE;60 }61 spin_unlock(&vol->ubi->volumes_lock);62 63 return err;64}65 66/**67 * revoke_exclusive - revoke exclusive mode.68 * @desc: volume descriptor69 * @mode: new mode to switch to70 */71static void revoke_exclusive(struct ubi_volume_desc *desc, int mode)72{73 struct ubi_volume *vol = desc->vol;74 75 spin_lock(&vol->ubi->volumes_lock);76 ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0);77 ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE);78 vol->exclusive = 0;79 if (mode == UBI_READONLY)80 vol->readers = 1;81 else if (mode == UBI_READWRITE)82 vol->writers = 1;83 else if (mode == UBI_METAONLY)84 vol->metaonly = 1;85 else86 vol->exclusive = 1;87 spin_unlock(&vol->ubi->volumes_lock);88 89 desc->mode = mode;90}91 92static int vol_cdev_open(struct inode *inode, struct file *file)93{94 struct ubi_volume_desc *desc;95 int vol_id = iminor(inode) - 1, mode, ubi_num;96 97 ubi_num = ubi_major2num(imajor(inode));98 if (ubi_num < 0)99 return ubi_num;100 101 if (file->f_mode & FMODE_WRITE)102 mode = UBI_READWRITE;103 else104 mode = UBI_READONLY;105 106 dbg_gen("open device %d, volume %d, mode %d",107 ubi_num, vol_id, mode);108 109 desc = ubi_open_volume(ubi_num, vol_id, mode);110 if (IS_ERR(desc))111 return PTR_ERR(desc);112 113 file->private_data = desc;114 return 0;115}116 117static int vol_cdev_release(struct inode *inode, struct file *file)118{119 struct ubi_volume_desc *desc = file->private_data;120 struct ubi_volume *vol = desc->vol;121 122 dbg_gen("release device %d, volume %d, mode %d",123 vol->ubi->ubi_num, vol->vol_id, desc->mode);124 125 if (vol->updating) {126 ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged",127 vol->vol_id);128 ubi_assert(!vol->changing_leb);129 vol->updating = 0;130 vfree(vol->upd_buf);131 } else if (vol->changing_leb) {132 dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel",133 vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num,134 vol->vol_id);135 vol->changing_leb = 0;136 vfree(vol->upd_buf);137 }138 139 ubi_close_volume(desc);140 return 0;141}142 143static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)144{145 struct ubi_volume_desc *desc = file->private_data;146 struct ubi_volume *vol = desc->vol;147 148 if (vol->updating) {149 /* Update is in progress, seeking is prohibited */150 ubi_err(vol->ubi, "updating");151 return -EBUSY;152 }153 154 return fixed_size_llseek(file, offset, origin, vol->used_bytes);155}156 157static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,158 int datasync)159{160 struct ubi_volume_desc *desc = file->private_data;161 struct ubi_device *ubi = desc->vol->ubi;162 struct inode *inode = file_inode(file);163 int err;164 inode_lock(inode);165 err = ubi_sync(ubi->ubi_num);166 inode_unlock(inode);167 return err;168}169 170 171static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,172 loff_t *offp)173{174 struct ubi_volume_desc *desc = file->private_data;175 struct ubi_volume *vol = desc->vol;176 struct ubi_device *ubi = vol->ubi;177 int err, lnum, off, len, tbuf_size;178 size_t count_save = count;179 void *tbuf;180 181 dbg_gen("read %zd bytes from offset %lld of volume %d",182 count, *offp, vol->vol_id);183 184 if (vol->updating) {185 ubi_err(vol->ubi, "updating");186 return -EBUSY;187 }188 if (vol->upd_marker) {189 ubi_err(vol->ubi, "damaged volume, update marker is set");190 return -EBADF;191 }192 if (*offp == vol->used_bytes || count == 0)193 return 0;194 195 if (vol->corrupted)196 dbg_gen("read from corrupted volume %d", vol->vol_id);197 198 if (*offp + count > vol->used_bytes)199 count_save = count = vol->used_bytes - *offp;200 201 tbuf_size = vol->usable_leb_size;202 if (count < tbuf_size)203 tbuf_size = ALIGN(count, ubi->min_io_size);204 tbuf = vmalloc(tbuf_size);205 if (!tbuf)206 return -ENOMEM;207 208 len = count > tbuf_size ? tbuf_size : count;209 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);210 211 do {212 cond_resched();213 214 if (off + len >= vol->usable_leb_size)215 len = vol->usable_leb_size - off;216 217 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);218 if (err)219 break;220 221 off += len;222 if (off == vol->usable_leb_size) {223 lnum += 1;224 off -= vol->usable_leb_size;225 }226 227 count -= len;228 *offp += len;229 230 err = copy_to_user(buf, tbuf, len);231 if (err) {232 err = -EFAULT;233 break;234 }235 236 buf += len;237 len = count > tbuf_size ? tbuf_size : count;238 } while (count);239 240 vfree(tbuf);241 return err ? err : count_save - count;242}243 244/*245 * This function allows to directly write to dynamic UBI volumes, without246 * issuing the volume update operation.247 */248static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,249 size_t count, loff_t *offp)250{251 struct ubi_volume_desc *desc = file->private_data;252 struct ubi_volume *vol = desc->vol;253 struct ubi_device *ubi = vol->ubi;254 int lnum, off, len, tbuf_size, err = 0;255 size_t count_save = count;256 char *tbuf;257 258 if (!vol->direct_writes)259 return -EPERM;260 261 dbg_gen("requested: write %zd bytes to offset %lld of volume %u",262 count, *offp, vol->vol_id);263 264 if (vol->vol_type == UBI_STATIC_VOLUME)265 return -EROFS;266 267 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);268 if (off & (ubi->min_io_size - 1)) {269 ubi_err(ubi, "unaligned position");270 return -EINVAL;271 }272 273 if (*offp + count > vol->used_bytes)274 count_save = count = vol->used_bytes - *offp;275 276 /* We can write only in fractions of the minimum I/O unit */277 if (count & (ubi->min_io_size - 1)) {278 ubi_err(ubi, "unaligned write length");279 return -EINVAL;280 }281 282 tbuf_size = vol->usable_leb_size;283 if (count < tbuf_size)284 tbuf_size = ALIGN(count, ubi->min_io_size);285 tbuf = vmalloc(tbuf_size);286 if (!tbuf)287 return -ENOMEM;288 289 len = count > tbuf_size ? tbuf_size : count;290 291 while (count) {292 cond_resched();293 294 if (off + len >= vol->usable_leb_size)295 len = vol->usable_leb_size - off;296 297 err = copy_from_user(tbuf, buf, len);298 if (err) {299 err = -EFAULT;300 break;301 }302 303 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len);304 if (err)305 break;306 307 off += len;308 if (off == vol->usable_leb_size) {309 lnum += 1;310 off -= vol->usable_leb_size;311 }312 313 count -= len;314 *offp += len;315 buf += len;316 len = count > tbuf_size ? tbuf_size : count;317 }318 319 vfree(tbuf);320 return err ? err : count_save - count;321}322 323static ssize_t vol_cdev_write(struct file *file, const char __user *buf,324 size_t count, loff_t *offp)325{326 int err = 0;327 struct ubi_volume_desc *desc = file->private_data;328 struct ubi_volume *vol = desc->vol;329 struct ubi_device *ubi = vol->ubi;330 331 if (!vol->updating && !vol->changing_leb)332 return vol_cdev_direct_write(file, buf, count, offp);333 334 if (vol->updating)335 err = ubi_more_update_data(ubi, vol, buf, count);336 else337 err = ubi_more_leb_change_data(ubi, vol, buf, count);338 339 if (err < 0) {340 ubi_err(ubi, "cannot accept more %zd bytes of data, error %d",341 count, err);342 return err;343 }344 345 if (err) {346 /*347 * The operation is finished, @err contains number of actually348 * written bytes.349 */350 count = err;351 352 if (vol->changing_leb) {353 revoke_exclusive(desc, UBI_READWRITE);354 return count;355 }356 357 /*358 * We voluntarily do not take into account the skip_check flag359 * as we want to make sure what we wrote was correctly written.360 */361 err = ubi_check_volume(ubi, vol->vol_id);362 if (err < 0)363 return err;364 365 if (err) {366 ubi_warn(ubi, "volume %d on UBI device %d is corrupted",367 vol->vol_id, ubi->ubi_num);368 vol->corrupted = 1;369 }370 vol->checked = 1;371 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);372 revoke_exclusive(desc, UBI_READWRITE);373 }374 375 return count;376}377 378static long vol_cdev_ioctl(struct file *file, unsigned int cmd,379 unsigned long arg)380{381 int err = 0;382 struct ubi_volume_desc *desc = file->private_data;383 struct ubi_volume *vol = desc->vol;384 struct ubi_device *ubi = vol->ubi;385 void __user *argp = (void __user *)arg;386 387 switch (cmd) {388 /* Volume update command */389 case UBI_IOCVOLUP:390 {391 int64_t bytes, rsvd_bytes;392 393 if (!capable(CAP_SYS_RESOURCE)) {394 err = -EPERM;395 break;396 }397 398 err = copy_from_user(&bytes, argp, sizeof(int64_t));399 if (err) {400 err = -EFAULT;401 break;402 }403 404 if (desc->mode == UBI_READONLY) {405 err = -EROFS;406 break;407 }408 409 rsvd_bytes = (long long)vol->reserved_pebs *410 vol->usable_leb_size;411 if (bytes < 0 || bytes > rsvd_bytes) {412 err = -EINVAL;413 break;414 }415 416 err = get_exclusive(desc);417 if (err < 0)418 break;419 420 err = ubi_start_update(ubi, vol, bytes);421 if (bytes == 0) {422 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);423 revoke_exclusive(desc, UBI_READWRITE);424 }425 break;426 }427 428 /* Atomic logical eraseblock change command */429 case UBI_IOCEBCH:430 {431 struct ubi_leb_change_req req;432 433 err = copy_from_user(&req, argp,434 sizeof(struct ubi_leb_change_req));435 if (err) {436 err = -EFAULT;437 break;438 }439 440 if (desc->mode == UBI_READONLY ||441 vol->vol_type == UBI_STATIC_VOLUME) {442 err = -EROFS;443 break;444 }445 446 /* Validate the request */447 err = -EINVAL;448 if (!ubi_leb_valid(vol, req.lnum) ||449 req.bytes < 0 || req.bytes > vol->usable_leb_size)450 break;451 452 err = get_exclusive(desc);453 if (err < 0)454 break;455 456 err = ubi_start_leb_change(ubi, vol, &req);457 if (req.bytes == 0)458 revoke_exclusive(desc, UBI_READWRITE);459 break;460 }461 462 /* Logical eraseblock erasure command */463 case UBI_IOCEBER:464 {465 int32_t lnum;466 467 err = get_user(lnum, (__user int32_t *)argp);468 if (err) {469 err = -EFAULT;470 break;471 }472 473 if (desc->mode == UBI_READONLY ||474 vol->vol_type == UBI_STATIC_VOLUME) {475 err = -EROFS;476 break;477 }478 479 if (!ubi_leb_valid(vol, lnum)) {480 err = -EINVAL;481 break;482 }483 484 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);485 err = ubi_eba_unmap_leb(ubi, vol, lnum);486 if (err)487 break;488 489 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);490 break;491 }492 493 /* Logical eraseblock map command */494 case UBI_IOCEBMAP:495 {496 struct ubi_map_req req;497 498 err = copy_from_user(&req, argp, sizeof(struct ubi_map_req));499 if (err) {500 err = -EFAULT;501 break;502 }503 err = ubi_leb_map(desc, req.lnum);504 break;505 }506 507 /* Logical eraseblock un-map command */508 case UBI_IOCEBUNMAP:509 {510 int32_t lnum;511 512 err = get_user(lnum, (__user int32_t *)argp);513 if (err) {514 err = -EFAULT;515 break;516 }517 err = ubi_leb_unmap(desc, lnum);518 break;519 }520 521 /* Check if logical eraseblock is mapped command */522 case UBI_IOCEBISMAP:523 {524 int32_t lnum;525 526 err = get_user(lnum, (__user int32_t *)argp);527 if (err) {528 err = -EFAULT;529 break;530 }531 err = ubi_is_mapped(desc, lnum);532 break;533 }534 535 /* Set volume property command */536 case UBI_IOCSETVOLPROP:537 {538 struct ubi_set_vol_prop_req req;539 540 err = copy_from_user(&req, argp,541 sizeof(struct ubi_set_vol_prop_req));542 if (err) {543 err = -EFAULT;544 break;545 }546 switch (req.property) {547 case UBI_VOL_PROP_DIRECT_WRITE:548 mutex_lock(&ubi->device_mutex);549 desc->vol->direct_writes = !!req.value;550 mutex_unlock(&ubi->device_mutex);551 break;552 default:553 err = -EINVAL;554 break;555 }556 break;557 }558 559 /* Create a R/O block device on top of the UBI volume */560 case UBI_IOCVOLCRBLK:561 {562 struct ubi_volume_info vi;563 564 ubi_get_volume_info(desc, &vi);565 err = ubiblock_create(&vi);566 break;567 }568 569 /* Remove the R/O block device */570 case UBI_IOCVOLRMBLK:571 {572 struct ubi_volume_info vi;573 574 ubi_get_volume_info(desc, &vi);575 err = ubiblock_remove(&vi);576 break;577 }578 579 default:580 err = -ENOTTY;581 break;582 }583 return err;584}585 586/**587 * verify_mkvol_req - verify volume creation request.588 * @ubi: UBI device description object589 * @req: the request to check590 *591 * This function zero if the request is correct, and %-EINVAL if not.592 */593static int verify_mkvol_req(const struct ubi_device *ubi,594 const struct ubi_mkvol_req *req)595{596 int n, err = -EINVAL;597 598 if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||599 req->name_len < 0)600 goto bad;601 602 if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&603 req->vol_id != UBI_VOL_NUM_AUTO)604 goto bad;605 606 if (req->alignment == 0)607 goto bad;608 609 if (req->bytes == 0)610 goto bad;611 612 if (req->vol_type != UBI_DYNAMIC_VOLUME &&613 req->vol_type != UBI_STATIC_VOLUME)614 goto bad;615 616 if (req->flags & ~UBI_VOL_VALID_FLGS)617 goto bad;618 619 if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG &&620 req->vol_type != UBI_STATIC_VOLUME)621 goto bad;622 623 if (req->alignment > ubi->leb_size)624 goto bad;625 626 n = req->alignment & (ubi->min_io_size - 1);627 if (req->alignment != 1 && n)628 goto bad;629 630 if (!req->name[0] || !req->name_len)631 goto bad;632 633 if (req->name_len > UBI_VOL_NAME_MAX) {634 err = -ENAMETOOLONG;635 goto bad;636 }637 638 n = strnlen(req->name, req->name_len + 1);639 if (n != req->name_len)640 goto bad;641 642 return 0;643 644bad:645 ubi_err(ubi, "bad volume creation request");646 ubi_dump_mkvol_req(req);647 return err;648}649 650/**651 * verify_rsvol_req - verify volume re-size request.652 * @ubi: UBI device description object653 * @req: the request to check654 *655 * This function returns zero if the request is correct, and %-EINVAL if not.656 */657static int verify_rsvol_req(const struct ubi_device *ubi,658 const struct ubi_rsvol_req *req)659{660 if (req->bytes <= 0)661 return -EINVAL;662 663 if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots)664 return -EINVAL;665 666 return 0;667}668 669/**670 * rename_volumes - rename UBI volumes.671 * @ubi: UBI device description object672 * @req: volumes re-name request673 *674 * This is a helper function for the volume re-name IOCTL which validates the675 * request, opens the volume and calls corresponding volumes management676 * function. Returns zero in case of success and a negative error code in case677 * of failure.678 */679static int rename_volumes(struct ubi_device *ubi,680 struct ubi_rnvol_req *req)681{682 int i, n, err;683 struct list_head rename_list;684 struct ubi_rename_entry *re, *re1;685 686 if (req->count < 0 || req->count > UBI_MAX_RNVOL)687 return -EINVAL;688 689 if (req->count == 0)690 return 0;691 692 /* Validate volume IDs and names in the request */693 for (i = 0; i < req->count; i++) {694 if (req->ents[i].vol_id < 0 ||695 req->ents[i].vol_id >= ubi->vtbl_slots)696 return -EINVAL;697 if (req->ents[i].name_len < 0)698 return -EINVAL;699 if (req->ents[i].name_len > UBI_VOL_NAME_MAX)700 return -ENAMETOOLONG;701 req->ents[i].name[req->ents[i].name_len] = '\0';702 n = strlen(req->ents[i].name);703 if (n != req->ents[i].name_len)704 return -EINVAL;705 }706 707 /* Make sure volume IDs and names are unique */708 for (i = 0; i < req->count - 1; i++) {709 for (n = i + 1; n < req->count; n++) {710 if (req->ents[i].vol_id == req->ents[n].vol_id) {711 ubi_err(ubi, "duplicated volume id %d",712 req->ents[i].vol_id);713 return -EINVAL;714 }715 if (!strcmp(req->ents[i].name, req->ents[n].name)) {716 ubi_err(ubi, "duplicated volume name \"%s\"",717 req->ents[i].name);718 return -EINVAL;719 }720 }721 }722 723 /* Create the re-name list */724 INIT_LIST_HEAD(&rename_list);725 for (i = 0; i < req->count; i++) {726 int vol_id = req->ents[i].vol_id;727 int name_len = req->ents[i].name_len;728 const char *name = req->ents[i].name;729 730 re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);731 if (!re) {732 err = -ENOMEM;733 goto out_free;734 }735 736 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY);737 if (IS_ERR(re->desc)) {738 err = PTR_ERR(re->desc);739 ubi_err(ubi, "cannot open volume %d, error %d",740 vol_id, err);741 kfree(re);742 goto out_free;743 }744 745 /* Skip this re-naming if the name does not really change */746 if (re->desc->vol->name_len == name_len &&747 !memcmp(re->desc->vol->name, name, name_len)) {748 ubi_close_volume(re->desc);749 kfree(re);750 continue;751 }752 753 re->new_name_len = name_len;754 memcpy(re->new_name, name, name_len);755 list_add_tail(&re->list, &rename_list);756 dbg_gen("will rename volume %d from \"%s\" to \"%s\"",757 vol_id, re->desc->vol->name, name);758 }759 760 if (list_empty(&rename_list))761 return 0;762 763 /* Find out the volumes which have to be removed */764 list_for_each_entry(re, &rename_list, list) {765 struct ubi_volume_desc *desc;766 int no_remove_needed = 0;767 768 /*769 * Volume @re->vol_id is going to be re-named to770 * @re->new_name, while its current name is @name. If a volume771 * with name @re->new_name currently exists, it has to be772 * removed, unless it is also re-named in the request (@req).773 */774 list_for_each_entry(re1, &rename_list, list) {775 if (re->new_name_len == re1->desc->vol->name_len &&776 !memcmp(re->new_name, re1->desc->vol->name,777 re1->desc->vol->name_len)) {778 no_remove_needed = 1;779 break;780 }781 }782 783 if (no_remove_needed)784 continue;785 786 /*787 * It seems we need to remove volume with name @re->new_name,788 * if it exists.789 */790 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name,791 UBI_EXCLUSIVE);792 if (IS_ERR(desc)) {793 err = PTR_ERR(desc);794 if (err == -ENODEV)795 /* Re-naming into a non-existing volume name */796 continue;797 798 /* The volume exists but busy, or an error occurred */799 ubi_err(ubi, "cannot open volume \"%s\", error %d",800 re->new_name, err);801 goto out_free;802 }803 804 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);805 if (!re1) {806 err = -ENOMEM;807 ubi_close_volume(desc);808 goto out_free;809 }810 811 re1->remove = 1;812 re1->desc = desc;813 list_add(&re1->list, &rename_list);814 dbg_gen("will remove volume %d, name \"%s\"",815 re1->desc->vol->vol_id, re1->desc->vol->name);816 }817 818 mutex_lock(&ubi->device_mutex);819 err = ubi_rename_volumes(ubi, &rename_list);820 mutex_unlock(&ubi->device_mutex);821 822out_free:823 list_for_each_entry_safe(re, re1, &rename_list, list) {824 ubi_close_volume(re->desc);825 list_del(&re->list);826 kfree(re);827 }828 return err;829}830 831static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,832 unsigned long arg)833{834 int err = 0;835 struct ubi_device *ubi;836 struct ubi_volume_desc *desc;837 void __user *argp = (void __user *)arg;838 839 if (!capable(CAP_SYS_RESOURCE))840 return -EPERM;841 842 ubi = ubi_get_by_major(imajor(file->f_mapping->host));843 if (!ubi)844 return -ENODEV;845 846 switch (cmd) {847 /* Create volume command */848 case UBI_IOCMKVOL:849 {850 struct ubi_mkvol_req req;851 852 dbg_gen("create volume");853 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));854 if (err) {855 err = -EFAULT;856 break;857 }858 859 err = verify_mkvol_req(ubi, &req);860 if (err)861 break;862 863 mutex_lock(&ubi->device_mutex);864 err = ubi_create_volume(ubi, &req);865 mutex_unlock(&ubi->device_mutex);866 if (err)867 break;868 869 err = put_user(req.vol_id, (__user int32_t *)argp);870 if (err)871 err = -EFAULT;872 873 break;874 }875 876 /* Remove volume command */877 case UBI_IOCRMVOL:878 {879 int vol_id;880 881 dbg_gen("remove volume");882 err = get_user(vol_id, (__user int32_t *)argp);883 if (err) {884 err = -EFAULT;885 break;886 }887 888 desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);889 if (IS_ERR(desc)) {890 err = PTR_ERR(desc);891 break;892 }893 894 mutex_lock(&ubi->device_mutex);895 err = ubi_remove_volume(desc, 0);896 mutex_unlock(&ubi->device_mutex);897 898 /*899 * The volume is deleted (unless an error occurred), and the900 * 'struct ubi_volume' object will be freed when901 * 'ubi_close_volume()' will call 'put_device()'.902 */903 ubi_close_volume(desc);904 break;905 }906 907 /* Re-size volume command */908 case UBI_IOCRSVOL:909 {910 int pebs;911 struct ubi_rsvol_req req;912 913 dbg_gen("re-size volume");914 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));915 if (err) {916 err = -EFAULT;917 break;918 }919 920 err = verify_rsvol_req(ubi, &req);921 if (err)922 break;923 924 desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);925 if (IS_ERR(desc)) {926 err = PTR_ERR(desc);927 break;928 }929 930 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,931 desc->vol->usable_leb_size);932 933 mutex_lock(&ubi->device_mutex);934 err = ubi_resize_volume(desc, pebs);935 mutex_unlock(&ubi->device_mutex);936 ubi_close_volume(desc);937 break;938 }939 940 /* Re-name volumes command */941 case UBI_IOCRNVOL:942 {943 struct ubi_rnvol_req *req;944 945 dbg_gen("re-name volumes");946 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);947 if (!req) {948 err = -ENOMEM;949 break;950 }951 952 err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));953 if (err) {954 err = -EFAULT;955 kfree(req);956 break;957 }958 959 err = rename_volumes(ubi, req);960 kfree(req);961 break;962 }963 964 /* Check a specific PEB for bitflips and scrub it if needed */965 case UBI_IOCRPEB:966 {967 int pnum;968 969 err = get_user(pnum, (__user int32_t *)argp);970 if (err) {971 err = -EFAULT;972 break;973 }974 975 err = ubi_bitflip_check(ubi, pnum, 0);976 break;977 }978 979 /* Force scrubbing for a specific PEB */980 case UBI_IOCSPEB:981 {982 int pnum;983 984 err = get_user(pnum, (__user int32_t *)argp);985 if (err) {986 err = -EFAULT;987 break;988 }989 990 err = ubi_bitflip_check(ubi, pnum, 1);991 break;992 }993 994 default:995 err = -ENOTTY;996 break;997 }998 999 ubi_put_device(ubi);1000 return err;1001}1002 1003static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,1004 unsigned long arg)1005{1006 int err = 0;1007 void __user *argp = (void __user *)arg;1008 1009 if (!capable(CAP_SYS_RESOURCE))1010 return -EPERM;1011 1012 switch (cmd) {1013 /* Attach an MTD device command */1014 case UBI_IOCATT:1015 {1016 struct ubi_attach_req req;1017 struct mtd_info *mtd;1018 1019 dbg_gen("attach MTD device");1020 err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));1021 if (err) {1022 err = -EFAULT;1023 break;1024 }1025 1026 if (req.mtd_num < 0 ||1027 (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {1028 err = -EINVAL;1029 break;1030 }1031 1032 mtd = get_mtd_device(NULL, req.mtd_num);1033 if (IS_ERR(mtd)) {1034 err = PTR_ERR(mtd);1035 break;1036 }1037 1038 /*1039 * Note, further request verification is done by1040 * 'ubi_attach_mtd_dev()'.1041 */1042 mutex_lock(&ubi_devices_mutex);1043 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,1044 req.max_beb_per1024, !!req.disable_fm,1045 !!req.need_resv_pool);1046 mutex_unlock(&ubi_devices_mutex);1047 if (err < 0)1048 put_mtd_device(mtd);1049 else1050 /* @err contains UBI device number */1051 err = put_user(err, (__user int32_t *)argp);1052 1053 break;1054 }1055 1056 /* Detach an MTD device command */1057 case UBI_IOCDET:1058 {1059 int ubi_num;1060 1061 dbg_gen("detach MTD device");1062 err = get_user(ubi_num, (__user int32_t *)argp);1063 if (err) {1064 err = -EFAULT;1065 break;1066 }1067 1068 mutex_lock(&ubi_devices_mutex);1069 err = ubi_detach_mtd_dev(ubi_num, 0);1070 mutex_unlock(&ubi_devices_mutex);1071 break;1072 }1073 1074 default:1075 err = -ENOTTY;1076 break;1077 }1078 1079 return err;1080}1081 1082/* UBI volume character device operations */1083const struct file_operations ubi_vol_cdev_operations = {1084 .owner = THIS_MODULE,1085 .open = vol_cdev_open,1086 .release = vol_cdev_release,1087 .llseek = vol_cdev_llseek,1088 .read = vol_cdev_read,1089 .write = vol_cdev_write,1090 .fsync = vol_cdev_fsync,1091 .unlocked_ioctl = vol_cdev_ioctl,1092 .compat_ioctl = compat_ptr_ioctl,1093};1094 1095/* UBI character device operations */1096const struct file_operations ubi_cdev_operations = {1097 .owner = THIS_MODULE,1098 .unlocked_ioctl = ubi_cdev_ioctl,1099 .compat_ioctl = compat_ptr_ioctl,1100};1101 1102/* UBI control character device operations */1103const struct file_operations ubi_ctrl_cdev_operations = {1104 .owner = THIS_MODULE,1105 .unlocked_ioctl = ctrl_cdev_ioctl,1106 .compat_ioctl = compat_ptr_ioctl,1107};1108