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 contains implementation of volume creation, deletion, updating and
26 #include <linux/err.h>
27 #include <linux/math64.h>
28 #include <linux/slab.h>
29 #include <linux/export.h>
32 #ifdef CONFIG_MTD_UBI_DEBUG
33 static int paranoid_check_volumes(struct ubi_device *ubi);
35 #define paranoid_check_volumes(ubi) 0
38 static ssize_t vol_attribute_show(struct device *dev,
39 struct device_attribute *attr, char *buf);
41 /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
42 static struct device_attribute attr_vol_reserved_ebs =
43 __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
44 static struct device_attribute attr_vol_type =
45 __ATTR(type, S_IRUGO, vol_attribute_show, NULL);
46 static struct device_attribute attr_vol_name =
47 __ATTR(name, S_IRUGO, vol_attribute_show, NULL);
48 static struct device_attribute attr_vol_corrupted =
49 __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
50 static struct device_attribute attr_vol_alignment =
51 __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
52 static struct device_attribute attr_vol_usable_eb_size =
53 __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
54 static struct device_attribute attr_vol_data_bytes =
55 __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
56 static struct device_attribute attr_vol_upd_marker =
57 __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
60 * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
62 * Consider a situation:
63 * A. process 1 opens a sysfs file related to volume Y, say
64 * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
65 * B. process 2 removes volume Y;
66 * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
68 * In this situation, this function will return %-ENODEV because it will find
69 * out that the volume was removed from the @ubi->volumes array.
71 static ssize_t vol_attribute_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
75 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
76 struct ubi_device *ubi;
78 ubi = ubi_get_device(vol->ubi->ubi_num);
82 spin_lock(&ubi->volumes_lock);
83 if (!ubi->volumes[vol->vol_id]) {
84 spin_unlock(&ubi->volumes_lock);
88 /* Take a reference to prevent volume removal */
90 spin_unlock(&ubi->volumes_lock);
92 if (attr == &attr_vol_reserved_ebs)
93 ret = sprintf(buf, "%d\n", vol->reserved_pebs);
94 else if (attr == &attr_vol_type) {
97 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
101 ret = sprintf(buf, "%s\n", tp);
102 } else if (attr == &attr_vol_name)
103 ret = sprintf(buf, "%s\n", vol->name);
104 else if (attr == &attr_vol_corrupted)
105 ret = sprintf(buf, "%d\n", vol->corrupted);
106 else if (attr == &attr_vol_alignment)
107 ret = sprintf(buf, "%d\n", vol->alignment);
108 else if (attr == &attr_vol_usable_eb_size)
109 ret = sprintf(buf, "%d\n", vol->usable_leb_size);
110 else if (attr == &attr_vol_data_bytes)
111 ret = sprintf(buf, "%lld\n", vol->used_bytes);
112 else if (attr == &attr_vol_upd_marker)
113 ret = sprintf(buf, "%d\n", vol->upd_marker);
115 /* This must be a bug */
118 /* We've done the operation, drop volume and UBI device references */
119 spin_lock(&ubi->volumes_lock);
121 ubi_assert(vol->ref_count >= 0);
122 spin_unlock(&ubi->volumes_lock);
127 /* Release method for volume devices */
128 static void vol_release(struct device *dev)
130 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
137 * volume_sysfs_init - initialize sysfs for new volume.
138 * @ubi: UBI device description object
139 * @vol: volume description object
141 * This function returns zero in case of success and a negative error code in
144 * Note, this function does not free allocated resources in case of failure -
145 * the caller does it. This is because this would cause release() here and the
148 static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol)
152 err = device_create_file(&vol->dev, &attr_vol_reserved_ebs);
155 err = device_create_file(&vol->dev, &attr_vol_type);
158 err = device_create_file(&vol->dev, &attr_vol_name);
161 err = device_create_file(&vol->dev, &attr_vol_corrupted);
164 err = device_create_file(&vol->dev, &attr_vol_alignment);
167 err = device_create_file(&vol->dev, &attr_vol_usable_eb_size);
170 err = device_create_file(&vol->dev, &attr_vol_data_bytes);
173 err = device_create_file(&vol->dev, &attr_vol_upd_marker);
178 * volume_sysfs_close - close sysfs for a volume.
179 * @vol: volume description object
181 static void volume_sysfs_close(struct ubi_volume *vol)
183 device_remove_file(&vol->dev, &attr_vol_upd_marker);
184 device_remove_file(&vol->dev, &attr_vol_data_bytes);
185 device_remove_file(&vol->dev, &attr_vol_usable_eb_size);
186 device_remove_file(&vol->dev, &attr_vol_alignment);
187 device_remove_file(&vol->dev, &attr_vol_corrupted);
188 device_remove_file(&vol->dev, &attr_vol_name);
189 device_remove_file(&vol->dev, &attr_vol_type);
190 device_remove_file(&vol->dev, &attr_vol_reserved_ebs);
191 device_unregister(&vol->dev);
195 * ubi_create_volume - create volume.
196 * @ubi: UBI device description object
197 * @req: volume creation request
199 * This function creates volume described by @req. If @req->vol_id id
200 * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
201 * and saves it in @req->vol_id. Returns zero in case of success and a negative
202 * error code in case of failure. Note, the caller has to have the
203 * @ubi->device_mutex locked.
205 int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
207 int i, err, vol_id = req->vol_id, do_free = 1;
208 struct ubi_volume *vol;
209 struct ubi_vtbl_record vtbl_rec;
215 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
219 spin_lock(&ubi->volumes_lock);
220 if (vol_id == UBI_VOL_NUM_AUTO) {
221 /* Find unused volume ID */
222 dbg_gen("search for vacant volume ID");
223 for (i = 0; i < ubi->vtbl_slots; i++)
224 if (!ubi->volumes[i]) {
229 if (vol_id == UBI_VOL_NUM_AUTO) {
230 dbg_err("out of volume IDs");
234 req->vol_id = vol_id;
237 dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s",
238 ubi->ubi_num, vol_id, (unsigned long long)req->bytes,
239 (int)req->vol_type, req->name);
241 /* Ensure that this volume does not exist */
243 if (ubi->volumes[vol_id]) {
244 dbg_err("volume %d already exists", vol_id);
248 /* Ensure that the name is unique */
249 for (i = 0; i < ubi->vtbl_slots; i++)
250 if (ubi->volumes[i] &&
251 ubi->volumes[i]->name_len == req->name_len &&
252 !strcmp(ubi->volumes[i]->name, req->name)) {
253 dbg_err("volume \"%s\" exists (ID %d)", req->name, i);
257 /* Calculate how many eraseblocks are requested */
258 vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
259 vol->reserved_pebs += div_u64(req->bytes + vol->usable_leb_size - 1,
260 vol->usable_leb_size);
262 /* Reserve physical eraseblocks */
263 if (vol->reserved_pebs > ubi->avail_pebs) {
264 dbg_err("not enough PEBs, only %d available", ubi->avail_pebs);
265 if (ubi->corr_peb_count)
266 dbg_err("%d PEBs are corrupted and not used",
267 ubi->corr_peb_count);
271 ubi->avail_pebs -= vol->reserved_pebs;
272 ubi->rsvd_pebs += vol->reserved_pebs;
273 spin_unlock(&ubi->volumes_lock);
275 vol->vol_id = vol_id;
276 vol->alignment = req->alignment;
277 vol->data_pad = ubi->leb_size % vol->alignment;
278 vol->vol_type = req->vol_type;
279 vol->name_len = req->name_len;
280 memcpy(vol->name, req->name, vol->name_len);
284 * Finish all pending erases because there may be some LEBs belonging
285 * to the same volume ID.
287 err = ubi_wl_flush(ubi);
291 vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
297 for (i = 0; i < vol->reserved_pebs; i++)
298 vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
300 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
301 vol->used_ebs = vol->reserved_pebs;
302 vol->last_eb_bytes = vol->usable_leb_size;
304 (long long)vol->used_ebs * vol->usable_leb_size;
306 vol->used_ebs = div_u64_rem(vol->used_bytes,
307 vol->usable_leb_size,
308 &vol->last_eb_bytes);
309 if (vol->last_eb_bytes != 0)
312 vol->last_eb_bytes = vol->usable_leb_size;
315 /* Make volume "available" before it becomes accessible via sysfs */
316 spin_lock(&ubi->volumes_lock);
317 ubi->volumes[vol_id] = vol;
319 spin_unlock(&ubi->volumes_lock);
321 /* Register character device for the volume */
322 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
323 vol->cdev.owner = THIS_MODULE;
324 dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1);
325 err = cdev_add(&vol->cdev, dev, 1);
327 ubi_err("cannot add character device");
331 vol->dev.release = vol_release;
332 vol->dev.parent = &ubi->dev;
334 vol->dev.class = ubi_class;
336 dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
337 err = device_register(&vol->dev);
339 ubi_err("cannot register device");
343 err = volume_sysfs_init(ubi, vol);
347 /* Fill volume table record */
348 memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
349 vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
350 vtbl_rec.alignment = cpu_to_be32(vol->alignment);
351 vtbl_rec.data_pad = cpu_to_be32(vol->data_pad);
352 vtbl_rec.name_len = cpu_to_be16(vol->name_len);
353 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
354 vtbl_rec.vol_type = UBI_VID_DYNAMIC;
356 vtbl_rec.vol_type = UBI_VID_STATIC;
357 memcpy(vtbl_rec.name, vol->name, vol->name_len);
359 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
363 ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
364 if (paranoid_check_volumes(ubi))
365 dbg_err("check failed while creating volume %d", vol_id);
370 * We have registered our device, we should not free the volume
371 * description object in this function in case of an error - it is
372 * freed by the release function.
374 * Get device reference to prevent the release function from being
375 * called just after sysfs has been closed.
378 get_device(&vol->dev);
379 volume_sysfs_close(vol);
381 cdev_del(&vol->cdev);
383 spin_lock(&ubi->volumes_lock);
384 ubi->volumes[vol_id] = NULL;
386 spin_unlock(&ubi->volumes_lock);
390 spin_lock(&ubi->volumes_lock);
391 ubi->rsvd_pebs -= vol->reserved_pebs;
392 ubi->avail_pebs += vol->reserved_pebs;
394 spin_unlock(&ubi->volumes_lock);
398 put_device(&vol->dev);
399 ubi_err("cannot create volume %d, error %d", vol_id, err);
404 * ubi_remove_volume - remove volume.
405 * @desc: volume descriptor
406 * @no_vtbl: do not change volume table if not zero
408 * This function removes volume described by @desc. The volume has to be opened
409 * in "exclusive" mode. Returns zero in case of success and a negative error
410 * code in case of failure. The caller has to have the @ubi->device_mutex
413 int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
415 struct ubi_volume *vol = desc->vol;
416 struct ubi_device *ubi = vol->ubi;
417 int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
419 dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id);
420 ubi_assert(desc->mode == UBI_EXCLUSIVE);
421 ubi_assert(vol == ubi->volumes[vol_id]);
426 spin_lock(&ubi->volumes_lock);
427 if (vol->ref_count > 1) {
429 * The volume is busy, probably someone is reading one of its
435 ubi->volumes[vol_id] = NULL;
436 spin_unlock(&ubi->volumes_lock);
439 err = ubi_change_vtbl_record(ubi, vol_id, NULL);
444 for (i = 0; i < vol->reserved_pebs; i++) {
445 err = ubi_eba_unmap_leb(ubi, vol, i);
450 cdev_del(&vol->cdev);
451 volume_sysfs_close(vol);
453 spin_lock(&ubi->volumes_lock);
454 ubi->rsvd_pebs -= reserved_pebs;
455 ubi->avail_pebs += reserved_pebs;
456 i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
458 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
459 ubi->avail_pebs -= i;
461 ubi->beb_rsvd_pebs += i;
463 ubi_msg("reserve more %d PEBs", i);
466 spin_unlock(&ubi->volumes_lock);
468 ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED);
469 if (!no_vtbl && paranoid_check_volumes(ubi))
470 dbg_err("check failed while removing volume %d", vol_id);
475 ubi_err("cannot remove volume %d, error %d", vol_id, err);
476 spin_lock(&ubi->volumes_lock);
477 ubi->volumes[vol_id] = vol;
479 spin_unlock(&ubi->volumes_lock);
484 * ubi_resize_volume - re-size volume.
485 * @desc: volume descriptor
486 * @reserved_pebs: new size in physical eraseblocks
488 * This function re-sizes the volume and returns zero in case of success, and a
489 * negative error code in case of failure. The caller has to have the
490 * @ubi->device_mutex locked.
492 int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
494 int i, err, pebs, *new_mapping;
495 struct ubi_volume *vol = desc->vol;
496 struct ubi_device *ubi = vol->ubi;
497 struct ubi_vtbl_record vtbl_rec;
498 int vol_id = vol->vol_id;
503 dbg_gen("re-size device %d, volume %d to from %d to %d PEBs",
504 ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs);
506 if (vol->vol_type == UBI_STATIC_VOLUME &&
507 reserved_pebs < vol->used_ebs) {
508 dbg_err("too small size %d, %d LEBs contain data",
509 reserved_pebs, vol->used_ebs);
513 /* If the size is the same, we have nothing to do */
514 if (reserved_pebs == vol->reserved_pebs)
517 new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
521 for (i = 0; i < reserved_pebs; i++)
522 new_mapping[i] = UBI_LEB_UNMAPPED;
524 spin_lock(&ubi->volumes_lock);
525 if (vol->ref_count > 1) {
526 spin_unlock(&ubi->volumes_lock);
530 spin_unlock(&ubi->volumes_lock);
532 /* Reserve physical eraseblocks */
533 pebs = reserved_pebs - vol->reserved_pebs;
535 spin_lock(&ubi->volumes_lock);
536 if (pebs > ubi->avail_pebs) {
537 dbg_err("not enough PEBs: requested %d, available %d",
538 pebs, ubi->avail_pebs);
539 if (ubi->corr_peb_count)
540 dbg_err("%d PEBs are corrupted and not used",
541 ubi->corr_peb_count);
542 spin_unlock(&ubi->volumes_lock);
546 ubi->avail_pebs -= pebs;
547 ubi->rsvd_pebs += pebs;
548 for (i = 0; i < vol->reserved_pebs; i++)
549 new_mapping[i] = vol->eba_tbl[i];
551 vol->eba_tbl = new_mapping;
552 spin_unlock(&ubi->volumes_lock);
555 /* Change volume table record */
556 memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
557 vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
558 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
563 for (i = 0; i < -pebs; i++) {
564 err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i);
568 spin_lock(&ubi->volumes_lock);
569 ubi->rsvd_pebs += pebs;
570 ubi->avail_pebs -= pebs;
571 pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
573 pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
574 ubi->avail_pebs -= pebs;
575 ubi->rsvd_pebs += pebs;
576 ubi->beb_rsvd_pebs += pebs;
578 ubi_msg("reserve more %d PEBs", pebs);
580 for (i = 0; i < reserved_pebs; i++)
581 new_mapping[i] = vol->eba_tbl[i];
583 vol->eba_tbl = new_mapping;
584 spin_unlock(&ubi->volumes_lock);
587 vol->reserved_pebs = reserved_pebs;
588 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
589 vol->used_ebs = reserved_pebs;
590 vol->last_eb_bytes = vol->usable_leb_size;
592 (long long)vol->used_ebs * vol->usable_leb_size;
595 ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED);
596 if (paranoid_check_volumes(ubi))
597 dbg_err("check failed while re-sizing volume %d", vol_id);
602 spin_lock(&ubi->volumes_lock);
603 ubi->rsvd_pebs -= pebs;
604 ubi->avail_pebs += pebs;
605 spin_unlock(&ubi->volumes_lock);
613 * ubi_rename_volumes - re-name UBI volumes.
614 * @ubi: UBI device description object
615 * @rename_list: list of &struct ubi_rename_entry objects
617 * This function re-names or removes volumes specified in the re-name list.
618 * Returns zero in case of success and a negative error code in case of
621 int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
624 struct ubi_rename_entry *re;
626 err = ubi_vtbl_rename_volumes(ubi, rename_list);
630 list_for_each_entry(re, rename_list, list) {
632 err = ubi_remove_volume(re->desc, 1);
636 struct ubi_volume *vol = re->desc->vol;
638 spin_lock(&ubi->volumes_lock);
639 vol->name_len = re->new_name_len;
640 memcpy(vol->name, re->new_name, re->new_name_len + 1);
641 spin_unlock(&ubi->volumes_lock);
642 ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED);
646 if (!err && paranoid_check_volumes(ubi))
652 * ubi_add_volume - add volume.
653 * @ubi: UBI device description object
654 * @vol: volume description object
656 * This function adds an existing volume and initializes all its data
657 * structures. Returns zero in case of success and a negative error code in
660 int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
662 int err, vol_id = vol->vol_id;
665 dbg_gen("add volume %d", vol_id);
667 /* Register character device for the volume */
668 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
669 vol->cdev.owner = THIS_MODULE;
670 dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1);
671 err = cdev_add(&vol->cdev, dev, 1);
673 ubi_err("cannot add character device for volume %d, error %d",
678 vol->dev.release = vol_release;
679 vol->dev.parent = &ubi->dev;
681 vol->dev.class = ubi_class;
682 dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
683 err = device_register(&vol->dev);
687 err = volume_sysfs_init(ubi, vol);
689 cdev_del(&vol->cdev);
690 volume_sysfs_close(vol);
694 if (paranoid_check_volumes(ubi))
695 dbg_err("check failed while adding volume %d", vol_id);
699 cdev_del(&vol->cdev);
704 * ubi_free_volume - free volume.
705 * @ubi: UBI device description object
706 * @vol: volume description object
708 * This function frees all resources for volume @vol but does not remove it.
709 * Used only when the UBI device is detached.
711 void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol)
713 dbg_gen("free volume %d", vol->vol_id);
715 ubi->volumes[vol->vol_id] = NULL;
716 cdev_del(&vol->cdev);
717 volume_sysfs_close(vol);
720 #ifdef CONFIG_MTD_UBI_DEBUG
723 * paranoid_check_volume - check volume information.
724 * @ubi: UBI device description object
727 * Returns zero if volume is all right and a a negative error code if not.
729 static int paranoid_check_volume(struct ubi_device *ubi, int vol_id)
731 int idx = vol_id2idx(ubi, vol_id);
732 int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
733 const struct ubi_volume *vol;
737 spin_lock(&ubi->volumes_lock);
738 reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
739 vol = ubi->volumes[idx];
743 ubi_err("no volume info, but volume exists");
746 spin_unlock(&ubi->volumes_lock);
750 if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
752 ubi_err("negative values");
755 if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
756 ubi_err("bad alignment");
760 n = vol->alignment & (ubi->min_io_size - 1);
761 if (vol->alignment != 1 && n) {
762 ubi_err("alignment is not multiple of min I/O unit");
766 n = ubi->leb_size % vol->alignment;
767 if (vol->data_pad != n) {
768 ubi_err("bad data_pad, has to be %lld", n);
772 if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
773 vol->vol_type != UBI_STATIC_VOLUME) {
774 ubi_err("bad vol_type");
778 if (vol->upd_marker && vol->corrupted) {
779 dbg_err("update marker and corrupted simultaneously");
783 if (vol->reserved_pebs > ubi->good_peb_count) {
784 ubi_err("too large reserved_pebs");
788 n = ubi->leb_size - vol->data_pad;
789 if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
790 ubi_err("bad usable_leb_size, has to be %lld", n);
794 if (vol->name_len > UBI_VOL_NAME_MAX) {
795 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
799 n = strnlen(vol->name, vol->name_len + 1);
800 if (n != vol->name_len) {
801 ubi_err("bad name_len %lld", n);
805 n = (long long)vol->used_ebs * vol->usable_leb_size;
806 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
807 if (vol->corrupted) {
808 ubi_err("corrupted dynamic volume");
811 if (vol->used_ebs != vol->reserved_pebs) {
812 ubi_err("bad used_ebs");
815 if (vol->last_eb_bytes != vol->usable_leb_size) {
816 ubi_err("bad last_eb_bytes");
819 if (vol->used_bytes != n) {
820 ubi_err("bad used_bytes");
824 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
825 ubi_err("bad used_ebs");
828 if (vol->last_eb_bytes < 0 ||
829 vol->last_eb_bytes > vol->usable_leb_size) {
830 ubi_err("bad last_eb_bytes");
833 if (vol->used_bytes < 0 || vol->used_bytes > n ||
834 vol->used_bytes < n - vol->usable_leb_size) {
835 ubi_err("bad used_bytes");
840 alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment);
841 data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad);
842 name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len);
843 upd_marker = ubi->vtbl[vol_id].upd_marker;
844 name = &ubi->vtbl[vol_id].name[0];
845 if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
846 vol_type = UBI_DYNAMIC_VOLUME;
848 vol_type = UBI_STATIC_VOLUME;
850 if (alignment != vol->alignment || data_pad != vol->data_pad ||
851 upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
852 name_len != vol->name_len || strncmp(name, vol->name, name_len)) {
853 ubi_err("volume info is different");
857 spin_unlock(&ubi->volumes_lock);
861 ubi_err("paranoid check failed for volume %d", vol_id);
863 ubi_dbg_dump_vol_info(vol);
864 ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
866 spin_unlock(&ubi->volumes_lock);
871 * paranoid_check_volumes - check information about all volumes.
872 * @ubi: UBI device description object
874 * Returns zero if volumes are all right and a a negative error code if not.
876 static int paranoid_check_volumes(struct ubi_device *ubi)
880 if (!ubi->dbg->chk_gen)
883 for (i = 0; i < ubi->vtbl_slots; i++) {
884 err = paranoid_check_volume(ubi, i);