2 * Copyright (c) International Business Machines Corp., 2006
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.
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.
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
18 * Author: Artem Bityutskiy (Битюцкий Артём)
22 * This file includes implementation of UBI character device operations.
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.
29 * Major and minor numbers are assigned dynamically to both UBI and volume
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
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>
50 * get_exclusive - get exclusive access to an UBI volume.
51 * @desc: volume descriptor
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
57 static int get_exclusive(struct ubi_volume_desc *desc)
60 struct ubi_volume *vol = desc->vol;
62 spin_lock(&vol->ubi->volumes_lock);
63 users = vol->readers + vol->writers + vol->exclusive + vol->metaonly;
64 ubi_assert(users > 0);
66 ubi_err(vol->ubi, "%d users for volume %d", users, vol->vol_id);
69 vol->readers = vol->writers = vol->metaonly = 0;
72 desc->mode = UBI_EXCLUSIVE;
74 spin_unlock(&vol->ubi->volumes_lock);
80 * revoke_exclusive - revoke exclusive mode.
81 * @desc: volume descriptor
82 * @mode: new mode to switch to
84 static void revoke_exclusive(struct ubi_volume_desc *desc, int mode)
86 struct ubi_volume *vol = desc->vol;
88 spin_lock(&vol->ubi->volumes_lock);
89 ubi_assert(vol->readers == 0 && vol->writers == 0 && vol->metaonly == 0);
90 ubi_assert(vol->exclusive == 1 && desc->mode == UBI_EXCLUSIVE);
92 if (mode == UBI_READONLY)
94 else if (mode == UBI_READWRITE)
96 else if (mode == UBI_METAONLY)
100 spin_unlock(&vol->ubi->volumes_lock);
105 static int vol_cdev_open(struct inode *inode, struct file *file)
107 struct ubi_volume_desc *desc;
108 int vol_id = iminor(inode) - 1, mode, ubi_num;
110 ubi_num = ubi_major2num(imajor(inode));
114 if (file->f_mode & FMODE_WRITE)
115 mode = UBI_READWRITE;
119 dbg_gen("open device %d, volume %d, mode %d",
120 ubi_num, vol_id, mode);
122 desc = ubi_open_volume(ubi_num, vol_id, mode);
124 return PTR_ERR(desc);
126 file->private_data = desc;
130 static int vol_cdev_release(struct inode *inode, struct file *file)
132 struct ubi_volume_desc *desc = file->private_data;
133 struct ubi_volume *vol = desc->vol;
135 dbg_gen("release device %d, volume %d, mode %d",
136 vol->ubi->ubi_num, vol->vol_id, desc->mode);
139 ubi_warn(vol->ubi, "update of volume %d not finished, volume is damaged",
141 ubi_assert(!vol->changing_leb);
144 } else if (vol->changing_leb) {
145 dbg_gen("only %lld of %lld bytes received for atomic LEB change for volume %d:%d, cancel",
146 vol->upd_received, vol->upd_bytes, vol->ubi->ubi_num,
148 vol->changing_leb = 0;
152 ubi_close_volume(desc);
156 static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
158 struct ubi_volume_desc *desc = file->private_data;
159 struct ubi_volume *vol = desc->vol;
162 /* Update is in progress, seeking is prohibited */
163 ubi_err(vol->ubi, "updating");
167 return fixed_size_llseek(file, offset, origin, vol->used_bytes);
170 static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
173 struct ubi_volume_desc *desc = file->private_data;
174 struct ubi_device *ubi = desc->vol->ubi;
175 struct inode *inode = file_inode(file);
178 err = ubi_sync(ubi->ubi_num);
184 static ssize_t vol_cdev_read(struct file *file, __user char *buf, size_t count,
187 struct ubi_volume_desc *desc = file->private_data;
188 struct ubi_volume *vol = desc->vol;
189 struct ubi_device *ubi = vol->ubi;
190 int err, lnum, off, len, tbuf_size;
191 size_t count_save = count;
194 dbg_gen("read %zd bytes from offset %lld of volume %d",
195 count, *offp, vol->vol_id);
198 ubi_err(vol->ubi, "updating");
201 if (vol->upd_marker) {
202 ubi_err(vol->ubi, "damaged volume, update marker is set");
205 if (*offp == vol->used_bytes || count == 0)
209 dbg_gen("read from corrupted volume %d", vol->vol_id);
211 if (*offp + count > vol->used_bytes)
212 count_save = count = vol->used_bytes - *offp;
214 tbuf_size = vol->usable_leb_size;
215 if (count < tbuf_size)
216 tbuf_size = ALIGN(count, ubi->min_io_size);
217 tbuf = vmalloc(tbuf_size);
221 len = count > tbuf_size ? tbuf_size : count;
222 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
227 if (off + len >= vol->usable_leb_size)
228 len = vol->usable_leb_size - off;
230 err = ubi_eba_read_leb(ubi, vol, lnum, tbuf, off, len, 0);
235 if (off == vol->usable_leb_size) {
237 off -= vol->usable_leb_size;
243 err = copy_to_user(buf, tbuf, len);
250 len = count > tbuf_size ? tbuf_size : count;
254 return err ? err : count_save - count;
258 * This function allows to directly write to dynamic UBI volumes, without
259 * issuing the volume update operation.
261 static ssize_t vol_cdev_direct_write(struct file *file, const char __user *buf,
262 size_t count, loff_t *offp)
264 struct ubi_volume_desc *desc = file->private_data;
265 struct ubi_volume *vol = desc->vol;
266 struct ubi_device *ubi = vol->ubi;
267 int lnum, off, len, tbuf_size, err = 0;
268 size_t count_save = count;
271 if (!vol->direct_writes)
274 dbg_gen("requested: write %zd bytes to offset %lld of volume %u",
275 count, *offp, vol->vol_id);
277 if (vol->vol_type == UBI_STATIC_VOLUME)
280 lnum = div_u64_rem(*offp, vol->usable_leb_size, &off);
281 if (off & (ubi->min_io_size - 1)) {
282 ubi_err(ubi, "unaligned position");
286 if (*offp + count > vol->used_bytes)
287 count_save = count = vol->used_bytes - *offp;
289 /* We can write only in fractions of the minimum I/O unit */
290 if (count & (ubi->min_io_size - 1)) {
291 ubi_err(ubi, "unaligned write length");
295 tbuf_size = vol->usable_leb_size;
296 if (count < tbuf_size)
297 tbuf_size = ALIGN(count, ubi->min_io_size);
298 tbuf = vmalloc(tbuf_size);
302 len = count > tbuf_size ? tbuf_size : count;
307 if (off + len >= vol->usable_leb_size)
308 len = vol->usable_leb_size - off;
310 err = copy_from_user(tbuf, buf, len);
316 err = ubi_eba_write_leb(ubi, vol, lnum, tbuf, off, len);
321 if (off == vol->usable_leb_size) {
323 off -= vol->usable_leb_size;
329 len = count > tbuf_size ? tbuf_size : count;
333 return err ? err : count_save - count;
336 static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
337 size_t count, loff_t *offp)
340 struct ubi_volume_desc *desc = file->private_data;
341 struct ubi_volume *vol = desc->vol;
342 struct ubi_device *ubi = vol->ubi;
344 if (!vol->updating && !vol->changing_leb)
345 return vol_cdev_direct_write(file, buf, count, offp);
348 err = ubi_more_update_data(ubi, vol, buf, count);
350 err = ubi_more_leb_change_data(ubi, vol, buf, count);
353 ubi_err(ubi, "cannot accept more %zd bytes of data, error %d",
360 * The operation is finished, @err contains number of actually
365 if (vol->changing_leb) {
366 revoke_exclusive(desc, UBI_READWRITE);
371 * We voluntarily do not take into account the skip_check flag
372 * as we want to make sure what we wrote was correctly written.
374 err = ubi_check_volume(ubi, vol->vol_id);
379 ubi_warn(ubi, "volume %d on UBI device %d is corrupted",
380 vol->vol_id, ubi->ubi_num);
384 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
385 revoke_exclusive(desc, UBI_READWRITE);
391 static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
395 struct ubi_volume_desc *desc = file->private_data;
396 struct ubi_volume *vol = desc->vol;
397 struct ubi_device *ubi = vol->ubi;
398 void __user *argp = (void __user *)arg;
401 /* Volume update command */
404 int64_t bytes, rsvd_bytes;
406 if (!capable(CAP_SYS_RESOURCE)) {
411 err = copy_from_user(&bytes, argp, sizeof(int64_t));
417 if (desc->mode == UBI_READONLY) {
422 rsvd_bytes = (long long)vol->reserved_pebs *
423 vol->usable_leb_size;
424 if (bytes < 0 || bytes > rsvd_bytes) {
429 err = get_exclusive(desc);
433 err = ubi_start_update(ubi, vol, bytes);
435 ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
436 revoke_exclusive(desc, UBI_READWRITE);
441 /* Atomic logical eraseblock change command */
444 struct ubi_leb_change_req req;
446 err = copy_from_user(&req, argp,
447 sizeof(struct ubi_leb_change_req));
453 if (desc->mode == UBI_READONLY ||
454 vol->vol_type == UBI_STATIC_VOLUME) {
459 /* Validate the request */
461 if (!ubi_leb_valid(vol, req.lnum) ||
462 req.bytes < 0 || req.bytes > vol->usable_leb_size)
465 err = get_exclusive(desc);
469 err = ubi_start_leb_change(ubi, vol, &req);
471 revoke_exclusive(desc, UBI_READWRITE);
475 /* Logical eraseblock erasure command */
480 err = get_user(lnum, (__user int32_t *)argp);
486 if (desc->mode == UBI_READONLY ||
487 vol->vol_type == UBI_STATIC_VOLUME) {
492 if (!ubi_leb_valid(vol, lnum)) {
497 dbg_gen("erase LEB %d:%d", vol->vol_id, lnum);
498 err = ubi_eba_unmap_leb(ubi, vol, lnum);
502 err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);
506 /* Logical eraseblock map command */
509 struct ubi_map_req req;
511 err = copy_from_user(&req, argp, sizeof(struct ubi_map_req));
516 err = ubi_leb_map(desc, req.lnum);
520 /* Logical eraseblock un-map command */
525 err = get_user(lnum, (__user int32_t *)argp);
530 err = ubi_leb_unmap(desc, lnum);
534 /* Check if logical eraseblock is mapped command */
539 err = get_user(lnum, (__user int32_t *)argp);
544 err = ubi_is_mapped(desc, lnum);
548 /* Set volume property command */
549 case UBI_IOCSETVOLPROP:
551 struct ubi_set_vol_prop_req req;
553 err = copy_from_user(&req, argp,
554 sizeof(struct ubi_set_vol_prop_req));
559 switch (req.property) {
560 case UBI_VOL_PROP_DIRECT_WRITE:
561 mutex_lock(&ubi->device_mutex);
562 desc->vol->direct_writes = !!req.value;
563 mutex_unlock(&ubi->device_mutex);
572 /* Create a R/O block device on top of the UBI volume */
573 case UBI_IOCVOLCRBLK:
575 struct ubi_volume_info vi;
577 ubi_get_volume_info(desc, &vi);
578 err = ubiblock_create(&vi);
582 /* Remove the R/O block device */
583 case UBI_IOCVOLRMBLK:
585 struct ubi_volume_info vi;
587 ubi_get_volume_info(desc, &vi);
588 err = ubiblock_remove(&vi);
600 * verify_mkvol_req - verify volume creation request.
601 * @ubi: UBI device description object
602 * @req: the request to check
604 * This function zero if the request is correct, and %-EINVAL if not.
606 static int verify_mkvol_req(const struct ubi_device *ubi,
607 const struct ubi_mkvol_req *req)
609 int n, err = -EINVAL;
611 if (req->bytes < 0 || req->alignment < 0 || req->vol_type < 0 ||
615 if ((req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots) &&
616 req->vol_id != UBI_VOL_NUM_AUTO)
619 if (req->alignment == 0)
625 if (req->vol_type != UBI_DYNAMIC_VOLUME &&
626 req->vol_type != UBI_STATIC_VOLUME)
629 if (req->flags & ~UBI_VOL_VALID_FLGS)
632 if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG &&
633 req->vol_type != UBI_STATIC_VOLUME)
636 if (req->alignment > ubi->leb_size)
639 n = req->alignment & (ubi->min_io_size - 1);
640 if (req->alignment != 1 && n)
643 if (!req->name[0] || !req->name_len)
646 if (req->name_len > UBI_VOL_NAME_MAX) {
651 n = strnlen(req->name, req->name_len + 1);
652 if (n != req->name_len)
658 ubi_err(ubi, "bad volume creation request");
659 ubi_dump_mkvol_req(req);
664 * verify_rsvol_req - verify volume re-size request.
665 * @ubi: UBI device description object
666 * @req: the request to check
668 * This function returns zero if the request is correct, and %-EINVAL if not.
670 static int verify_rsvol_req(const struct ubi_device *ubi,
671 const struct ubi_rsvol_req *req)
676 if (req->vol_id < 0 || req->vol_id >= ubi->vtbl_slots)
683 * rename_volumes - rename UBI volumes.
684 * @ubi: UBI device description object
685 * @req: volumes re-name request
687 * This is a helper function for the volume re-name IOCTL which validates the
688 * the request, opens the volume and calls corresponding volumes management
689 * function. Returns zero in case of success and a negative error code in case
692 static int rename_volumes(struct ubi_device *ubi,
693 struct ubi_rnvol_req *req)
696 struct list_head rename_list;
697 struct ubi_rename_entry *re, *re1;
699 if (req->count < 0 || req->count > UBI_MAX_RNVOL)
705 /* Validate volume IDs and names in the request */
706 for (i = 0; i < req->count; i++) {
707 if (req->ents[i].vol_id < 0 ||
708 req->ents[i].vol_id >= ubi->vtbl_slots)
710 if (req->ents[i].name_len < 0)
712 if (req->ents[i].name_len > UBI_VOL_NAME_MAX)
713 return -ENAMETOOLONG;
714 req->ents[i].name[req->ents[i].name_len] = '\0';
715 n = strlen(req->ents[i].name);
716 if (n != req->ents[i].name_len)
720 /* Make sure volume IDs and names are unique */
721 for (i = 0; i < req->count - 1; i++) {
722 for (n = i + 1; n < req->count; n++) {
723 if (req->ents[i].vol_id == req->ents[n].vol_id) {
724 ubi_err(ubi, "duplicated volume id %d",
725 req->ents[i].vol_id);
728 if (!strcmp(req->ents[i].name, req->ents[n].name)) {
729 ubi_err(ubi, "duplicated volume name \"%s\"",
736 /* Create the re-name list */
737 INIT_LIST_HEAD(&rename_list);
738 for (i = 0; i < req->count; i++) {
739 int vol_id = req->ents[i].vol_id;
740 int name_len = req->ents[i].name_len;
741 const char *name = req->ents[i].name;
743 re = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
749 re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_METAONLY);
750 if (IS_ERR(re->desc)) {
751 err = PTR_ERR(re->desc);
752 ubi_err(ubi, "cannot open volume %d, error %d",
758 /* Skip this re-naming if the name does not really change */
759 if (re->desc->vol->name_len == name_len &&
760 !memcmp(re->desc->vol->name, name, name_len)) {
761 ubi_close_volume(re->desc);
766 re->new_name_len = name_len;
767 memcpy(re->new_name, name, name_len);
768 list_add_tail(&re->list, &rename_list);
769 dbg_gen("will rename volume %d from \"%s\" to \"%s\"",
770 vol_id, re->desc->vol->name, name);
773 if (list_empty(&rename_list))
776 /* Find out the volumes which have to be removed */
777 list_for_each_entry(re, &rename_list, list) {
778 struct ubi_volume_desc *desc;
779 int no_remove_needed = 0;
782 * Volume @re->vol_id is going to be re-named to
783 * @re->new_name, while its current name is @name. If a volume
784 * with name @re->new_name currently exists, it has to be
785 * removed, unless it is also re-named in the request (@req).
787 list_for_each_entry(re1, &rename_list, list) {
788 if (re->new_name_len == re1->desc->vol->name_len &&
789 !memcmp(re->new_name, re1->desc->vol->name,
790 re1->desc->vol->name_len)) {
791 no_remove_needed = 1;
796 if (no_remove_needed)
800 * It seems we need to remove volume with name @re->new_name,
803 desc = ubi_open_volume_nm(ubi->ubi_num, re->new_name,
808 /* Re-naming into a non-existing volume name */
811 /* The volume exists but busy, or an error occurred */
812 ubi_err(ubi, "cannot open volume \"%s\", error %d",
817 re1 = kzalloc(sizeof(struct ubi_rename_entry), GFP_KERNEL);
820 ubi_close_volume(desc);
826 list_add(&re1->list, &rename_list);
827 dbg_gen("will remove volume %d, name \"%s\"",
828 re1->desc->vol->vol_id, re1->desc->vol->name);
831 mutex_lock(&ubi->device_mutex);
832 err = ubi_rename_volumes(ubi, &rename_list);
833 mutex_unlock(&ubi->device_mutex);
836 list_for_each_entry_safe(re, re1, &rename_list, list) {
837 ubi_close_volume(re->desc);
844 static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
848 struct ubi_device *ubi;
849 struct ubi_volume_desc *desc;
850 void __user *argp = (void __user *)arg;
852 if (!capable(CAP_SYS_RESOURCE))
855 ubi = ubi_get_by_major(imajor(file->f_mapping->host));
860 /* Create volume command */
863 struct ubi_mkvol_req req;
865 dbg_gen("create volume");
866 err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
872 err = verify_mkvol_req(ubi, &req);
876 mutex_lock(&ubi->device_mutex);
877 err = ubi_create_volume(ubi, &req);
878 mutex_unlock(&ubi->device_mutex);
882 err = put_user(req.vol_id, (__user int32_t *)argp);
889 /* Remove volume command */
894 dbg_gen("remove volume");
895 err = get_user(vol_id, (__user int32_t *)argp);
901 desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
907 mutex_lock(&ubi->device_mutex);
908 err = ubi_remove_volume(desc, 0);
909 mutex_unlock(&ubi->device_mutex);
912 * The volume is deleted (unless an error occurred), and the
913 * 'struct ubi_volume' object will be freed when
914 * 'ubi_close_volume()' will call 'put_device()'.
916 ubi_close_volume(desc);
920 /* Re-size volume command */
924 struct ubi_rsvol_req req;
926 dbg_gen("re-size volume");
927 err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
933 err = verify_rsvol_req(ubi, &req);
937 desc = ubi_open_volume(ubi->ubi_num, req.vol_id, UBI_EXCLUSIVE);
943 pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
944 desc->vol->usable_leb_size);
946 mutex_lock(&ubi->device_mutex);
947 err = ubi_resize_volume(desc, pebs);
948 mutex_unlock(&ubi->device_mutex);
949 ubi_close_volume(desc);
953 /* Re-name volumes command */
956 struct ubi_rnvol_req *req;
958 dbg_gen("re-name volumes");
959 req = kmalloc(sizeof(struct ubi_rnvol_req), GFP_KERNEL);
965 err = copy_from_user(req, argp, sizeof(struct ubi_rnvol_req));
972 err = rename_volumes(ubi, req);
986 static long ctrl_cdev_ioctl(struct file *file, unsigned int cmd,
990 void __user *argp = (void __user *)arg;
992 if (!capable(CAP_SYS_RESOURCE))
996 /* Attach an MTD device command */
999 struct ubi_attach_req req;
1000 struct mtd_info *mtd;
1002 dbg_gen("attach MTD device");
1003 err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
1009 if (req.mtd_num < 0 ||
1010 (req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
1015 mtd = get_mtd_device(NULL, req.mtd_num);
1022 * Note, further request verification is done by
1023 * 'ubi_attach_mtd_dev()'.
1025 mutex_lock(&ubi_devices_mutex);
1026 err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset,
1027 req.max_beb_per1024);
1028 mutex_unlock(&ubi_devices_mutex);
1030 put_mtd_device(mtd);
1032 /* @err contains UBI device number */
1033 err = put_user(err, (__user int32_t *)argp);
1038 /* Detach an MTD device command */
1043 dbg_gen("detach MTD device");
1044 err = get_user(ubi_num, (__user int32_t *)argp);
1050 mutex_lock(&ubi_devices_mutex);
1051 err = ubi_detach_mtd_dev(ubi_num, 0);
1052 mutex_unlock(&ubi_devices_mutex);
1064 #ifdef CONFIG_COMPAT
1065 static long vol_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1068 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1070 return vol_cdev_ioctl(file, cmd, translated_arg);
1073 static long ubi_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1076 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1078 return ubi_cdev_ioctl(file, cmd, translated_arg);
1081 static long ctrl_cdev_compat_ioctl(struct file *file, unsigned int cmd,
1084 unsigned long translated_arg = (unsigned long)compat_ptr(arg);
1086 return ctrl_cdev_ioctl(file, cmd, translated_arg);
1089 #define vol_cdev_compat_ioctl NULL
1090 #define ubi_cdev_compat_ioctl NULL
1091 #define ctrl_cdev_compat_ioctl NULL
1094 /* UBI volume character device operations */
1095 const struct file_operations ubi_vol_cdev_operations = {
1096 .owner = THIS_MODULE,
1097 .open = vol_cdev_open,
1098 .release = vol_cdev_release,
1099 .llseek = vol_cdev_llseek,
1100 .read = vol_cdev_read,
1101 .write = vol_cdev_write,
1102 .fsync = vol_cdev_fsync,
1103 .unlocked_ioctl = vol_cdev_ioctl,
1104 .compat_ioctl = vol_cdev_compat_ioctl,
1107 /* UBI character device operations */
1108 const struct file_operations ubi_cdev_operations = {
1109 .owner = THIS_MODULE,
1110 .llseek = no_llseek,
1111 .unlocked_ioctl = ubi_cdev_ioctl,
1112 .compat_ioctl = ubi_cdev_compat_ioctl,
1115 /* UBI control character device operations */
1116 const struct file_operations ubi_ctrl_cdev_operations = {
1117 .owner = THIS_MODULE,
1118 .unlocked_ioctl = ctrl_cdev_ioctl,
1119 .compat_ioctl = ctrl_cdev_compat_ioctl,
1120 .llseek = no_llseek,