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UBI: use is_power_of_2()
[linux-block.git] / drivers / mtd / ubi / vmt.c
CommitLineData
801c135c
AB		 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 contains implementation of volume creation, deletion, updating and
23 * resizing.
24 */
25
26#include <linux/err.h>
27#include <asm/div64.h>
28#include "ubi.h"
29
30#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
31static void paranoid_check_volumes(struct ubi_device *ubi);
32#else
33#define paranoid_check_volumes(ubi)
34#endif
35
36static ssize_t vol_attribute_show(struct device *dev,
37 struct device_attribute *attr, char *buf);
38
39/* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
40static struct device_attribute vol_reserved_ebs =
41 __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
42static struct device_attribute vol_type =
43 __ATTR(type, S_IRUGO, vol_attribute_show, NULL);
44static struct device_attribute vol_name =
45 __ATTR(name, S_IRUGO, vol_attribute_show, NULL);
46static struct device_attribute vol_corrupted =
47 __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
48static struct device_attribute vol_alignment =
49 __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
50static struct device_attribute vol_usable_eb_size =
51 __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
52static struct device_attribute vol_data_bytes =
53 __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
54static struct device_attribute vol_upd_marker =
55 __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
56
57/*
58 * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
59 *
60 * Consider a situation:
61 * A. process 1 opens a sysfs file related to volume Y, say
62 * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
63 * B. process 2 removes volume Y;
64 * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
65 *
66 * What we want to do in a situation like that is to return error when the file
67 * is read. This is done by means of the 'removed' flag and the 'vol_lock' of
68 * the UBI volume description object.
69 */
70static ssize_t vol_attribute_show(struct device *dev,
71 struct device_attribute *attr, char *buf)
72{
73 int ret;
74 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
75
76 spin_lock(&vol->ubi->volumes_lock);
77 if (vol->removed) {
78 spin_unlock(&vol->ubi->volumes_lock);
79 return -ENODEV;
80 }
81 if (attr == &vol_reserved_ebs)
82 ret = sprintf(buf, "%d\n", vol->reserved_pebs);
83 else if (attr == &vol_type) {
84 const char *tp;
85 tp = vol->vol_type == UBI_DYNAMIC_VOLUME ? "dynamic" : "static";
86 ret = sprintf(buf, "%s\n", tp);
87 } else if (attr == &vol_name)
88 ret = sprintf(buf, "%s\n", vol->name);
89 else if (attr == &vol_corrupted)
90 ret = sprintf(buf, "%d\n", vol->corrupted);
91 else if (attr == &vol_alignment)
92 ret = sprintf(buf, "%d\n", vol->alignment);
93 else if (attr == &vol_usable_eb_size) {
94 ret = sprintf(buf, "%d\n", vol->usable_leb_size);
95 } else if (attr == &vol_data_bytes)
96 ret = sprintf(buf, "%lld\n", vol->used_bytes);
97 else if (attr == &vol_upd_marker)
98 ret = sprintf(buf, "%d\n", vol->upd_marker);
99 else
100 BUG();
101 spin_unlock(&vol->ubi->volumes_lock);
102 return ret;
103}
104
105/* Release method for volume devices */
106static void vol_release(struct device *dev)
107{
108 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
109 ubi_assert(vol->removed);
110 kfree(vol);
111}
112
113/**
114 * volume_sysfs_init - initialize sysfs for new volume.
115 * @ubi: UBI device description object
116 * @vol: volume description object
117 *
118 * This function returns zero in case of success and a negative error code in
119 * case of failure.
120 *
121 * Note, this function does not free allocated resources in case of failure -
122 * the caller does it. This is because this would cause release() here and the
123 * caller would oops.
124 */
125static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol)
126{
127 int err;
128
129 err = device_create_file(&vol->dev, &vol_reserved_ebs);
130 if (err)
131 return err;
132 err = device_create_file(&vol->dev, &vol_type);
133 if (err)
134 return err;
135 err = device_create_file(&vol->dev, &vol_name);
136 if (err)
137 return err;
138 err = device_create_file(&vol->dev, &vol_corrupted);
139 if (err)
140 return err;
141 err = device_create_file(&vol->dev, &vol_alignment);
142 if (err)
143 return err;
144 err = device_create_file(&vol->dev, &vol_usable_eb_size);
145 if (err)
146 return err;
147 err = device_create_file(&vol->dev, &vol_data_bytes);
148 if (err)
149 return err;
150 err = device_create_file(&vol->dev, &vol_upd_marker);
151 if (err)
152 return err;
153 return 0;
154}
155
156/**
157 * volume_sysfs_close - close sysfs for a volume.
158 * @vol: volume description object
159 */
160static void volume_sysfs_close(struct ubi_volume *vol)
161{
162 device_remove_file(&vol->dev, &vol_upd_marker);
163 device_remove_file(&vol->dev, &vol_data_bytes);
164 device_remove_file(&vol->dev, &vol_usable_eb_size);
165 device_remove_file(&vol->dev, &vol_alignment);
166 device_remove_file(&vol->dev, &vol_corrupted);
167 device_remove_file(&vol->dev, &vol_name);
168 device_remove_file(&vol->dev, &vol_type);
169 device_remove_file(&vol->dev, &vol_reserved_ebs);
170 device_unregister(&vol->dev);
171}
172
173/**
174 * ubi_create_volume - create volume.
175 * @ubi: UBI device description object
176 * @req: volume creation request
177 *
178 * This function creates volume described by @req. If @req->vol_id id
179 * %UBI_VOL_NUM_AUTO, this function automatically assigne ID to the new volume
180 * and saves it in @req->vol_id. Returns zero in case of success and a negative
181 * error code in case of failure.
182 */
183int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
184{
185 int i, err, vol_id = req->vol_id;
186 struct ubi_volume *vol;
187 struct ubi_vtbl_record vtbl_rec;
188 uint64_t bytes;
189
190 if (ubi->ro_mode)
191 return -EROFS;
192
193 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
194 if (!vol)
195 return -ENOMEM;
196
197 spin_lock(&ubi->volumes_lock);
198
199 if (vol_id == UBI_VOL_NUM_AUTO) {
200 /* Find unused volume ID */
201 dbg_msg("search for vacant volume ID");
202 for (i = 0; i < ubi->vtbl_slots; i++)
203 if (!ubi->volumes[i]) {
204 vol_id = i;
205 break;
206 }
207
208 if (vol_id == UBI_VOL_NUM_AUTO) {
209 dbg_err("out of volume IDs");
210 err = -ENFILE;
211 goto out_unlock;
212 }
213 req->vol_id = vol_id;
214 }
215
216 dbg_msg("volume ID %d, %llu bytes, type %d, name %s",
217 vol_id, (unsigned long long)req->bytes,
218 (int)req->vol_type, req->name);
219
220 /* Ensure that this volume does not exist */
221 err = -EEXIST;
222 if (ubi->volumes[vol_id]) {
223 dbg_err("volume %d already exists", vol_id);
224 goto out_unlock;
225 }
226
227 /* Ensure that the name is unique */
228 for (i = 0; i < ubi->vtbl_slots; i++)
229 if (ubi->volumes[i] &&
230 ubi->volumes[i]->name_len == req->name_len &&
231 strcmp(ubi->volumes[i]->name, req->name) == 0) {
232 dbg_err("volume \"%s\" exists (ID %d)", req->name, i);
233 goto out_unlock;
234 }
235
236 /* Calculate how many eraseblocks are requested */
237 vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
238 bytes = req->bytes;
239 if (do_div(bytes, vol->usable_leb_size))
240 vol->reserved_pebs = 1;
241 vol->reserved_pebs += bytes;
242
243 /* Reserve physical eraseblocks */
244 if (vol->reserved_pebs > ubi->avail_pebs) {
245 dbg_err("not enough PEBs, only %d available", ubi->avail_pebs);
801c135c
AB		 246 err = -ENOSPC;
247 goto out_unlock;
248 }
249 ubi->avail_pebs -= vol->reserved_pebs;
250 ubi->rsvd_pebs += vol->reserved_pebs;
251
252 vol->vol_id = vol_id;
253 vol->alignment = req->alignment;
254 vol->data_pad = ubi->leb_size % vol->alignment;
255 vol->vol_type = req->vol_type;
256 vol->name_len = req->name_len;
257 memcpy(vol->name, req->name, vol->name_len + 1);
258 vol->exclusive = 1;
259 vol->ubi = ubi;
260 ubi->volumes[vol_id] = vol;
261 spin_unlock(&ubi->volumes_lock);
262
263 /*
264 * Finish all pending erases because there may be some LEBs belonging
265 * to the same volume ID.
266 */
267 err = ubi_wl_flush(ubi);
268 if (err)
269 goto out_acc;
270
271 vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
272 if (!vol->eba_tbl) {
273 err = -ENOMEM;
274 goto out_acc;
275 }
276
277 for (i = 0; i < vol->reserved_pebs; i++)
278 vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
279
280 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
281 vol->used_ebs = vol->reserved_pebs;
282 vol->last_eb_bytes = vol->usable_leb_size;
283 vol->used_bytes = vol->used_ebs * vol->usable_leb_size;
284 } else {
285 bytes = vol->used_bytes;
286 vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size);
287 vol->used_ebs = bytes;
288 if (vol->last_eb_bytes)
289 vol->used_ebs += 1;
290 else
291 vol->last_eb_bytes = vol->usable_leb_size;
292 }
293
294 /* Register character device for the volume */
295 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
296 vol->cdev.owner = THIS_MODULE;
297 err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol_id + 1), 1);
298 if (err) {
299 ubi_err("cannot add character device for volume %d", vol_id);
300 goto out_mapping;
301 }
302
303 err = ubi_create_gluebi(ubi, vol);
304 if (err)
305 goto out_cdev;
306
307 vol->dev.release = vol_release;
308 vol->dev.parent = &ubi->dev;
309 vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
310 vol->dev.class = ubi_class;
311 sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
312 err = device_register(&vol->dev);
313 if (err)
314 goto out_gluebi;
315
316 err = volume_sysfs_init(ubi, vol);
317 if (err)
318 goto out_sysfs;
319
320 /* Fill volume table record */
321 memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
3261ebd7
CH		 322 vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
323 vtbl_rec.alignment = cpu_to_be32(vol->alignment);
324 vtbl_rec.data_pad = cpu_to_be32(vol->data_pad);
325 vtbl_rec.name_len = cpu_to_be16(vol->name_len);
801c135c
AB		 326 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
327 vtbl_rec.vol_type = UBI_VID_DYNAMIC;
328 else
329 vtbl_rec.vol_type = UBI_VID_STATIC;
330 memcpy(vtbl_rec.name, vol->name, vol->name_len + 1);
331
332 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
333 if (err)
334 goto out_sysfs;
335
336 spin_lock(&ubi->volumes_lock);
337 ubi->vol_count += 1;
338 vol->exclusive = 0;
339 spin_unlock(&ubi->volumes_lock);
340
341 paranoid_check_volumes(ubi);
342 return 0;
343
344out_gluebi:
345 err = ubi_destroy_gluebi(vol);
346out_cdev:
347 cdev_del(&vol->cdev);
348out_mapping:
349 kfree(vol->eba_tbl);
350out_acc:
351 spin_lock(&ubi->volumes_lock);
352 ubi->rsvd_pebs -= vol->reserved_pebs;
353 ubi->avail_pebs += vol->reserved_pebs;
354out_unlock:
355 spin_unlock(&ubi->volumes_lock);
356 kfree(vol);
357 return err;
358
359 /*
360 * We are registered, so @vol is destroyed in the release function and
361 * we have to de-initialize differently.
362 */
363out_sysfs:
364 err = ubi_destroy_gluebi(vol);
365 cdev_del(&vol->cdev);
366 kfree(vol->eba_tbl);
367 spin_lock(&ubi->volumes_lock);
368 ubi->rsvd_pebs -= vol->reserved_pebs;
369 ubi->avail_pebs += vol->reserved_pebs;
370 spin_unlock(&ubi->volumes_lock);
371 volume_sysfs_close(vol);
372 return err;
373}
374
375/**
376 * ubi_remove_volume - remove volume.
377 * @desc: volume descriptor
378 *
379 * This function removes volume described by @desc. The volume has to be opened
380 * in "exclusive" mode. Returns zero in case of success and a negative error
381 * code in case of failure.
382 */
383int ubi_remove_volume(struct ubi_volume_desc *desc)
384{
385 struct ubi_volume *vol = desc->vol;
386 struct ubi_device *ubi = vol->ubi;
387 int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
388
389 dbg_msg("remove UBI volume %d", vol_id);
390 ubi_assert(desc->mode == UBI_EXCLUSIVE);
391 ubi_assert(vol == ubi->volumes[vol_id]);
392
393 if (ubi->ro_mode)
394 return -EROFS;
395
396 err = ubi_destroy_gluebi(vol);
397 if (err)
398 return err;
399
400 err = ubi_change_vtbl_record(ubi, vol_id, NULL);
401 if (err)
402 return err;
403
404 for (i = 0; i < vol->reserved_pebs; i++) {
405 err = ubi_eba_unmap_leb(ubi, vol_id, i);
406 if (err)
407 return err;
408 }
409
410 spin_lock(&ubi->volumes_lock);
411 vol->removed = 1;
412 ubi->volumes[vol_id] = NULL;
413 spin_unlock(&ubi->volumes_lock);
414
415 kfree(vol->eba_tbl);
416 vol->eba_tbl = NULL;
417 cdev_del(&vol->cdev);
418 volume_sysfs_close(vol);
419 kfree(desc);
420
421 spin_lock(&ubi->volumes_lock);
422 ubi->rsvd_pebs -= reserved_pebs;
423 ubi->avail_pebs += reserved_pebs;
424 i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
425 if (i > 0) {
426 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
427 ubi->avail_pebs -= i;
428 ubi->rsvd_pebs += i;
429 ubi->beb_rsvd_pebs += i;
430 if (i > 0)
431 ubi_msg("reserve more %d PEBs", i);
432 }
433 ubi->vol_count -= 1;
434 spin_unlock(&ubi->volumes_lock);
435
436 paranoid_check_volumes(ubi);
437 module_put(THIS_MODULE);
438 return 0;
439}
440
441/**
442 * ubi_resize_volume - re-size volume.
443 * @desc: volume descriptor
444 * @reserved_pebs: new size in physical eraseblocks
445 *
446 * This function returns zero in case of success, and a negative error code in
447 * case of failure.
448 */
449int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
450{
451 int i, err, pebs, *new_mapping;
452 struct ubi_volume *vol = desc->vol;
453 struct ubi_device *ubi = vol->ubi;
454 struct ubi_vtbl_record vtbl_rec;
455 int vol_id = vol->vol_id;
456
457 if (ubi->ro_mode)
458 return -EROFS;
459
460 dbg_msg("re-size volume %d to from %d to %d PEBs",
461 vol_id, vol->reserved_pebs, reserved_pebs);
462 ubi_assert(desc->mode == UBI_EXCLUSIVE);
463 ubi_assert(vol == ubi->volumes[vol_id]);
464
465 if (vol->vol_type == UBI_STATIC_VOLUME &&
466 reserved_pebs < vol->used_ebs) {
467 dbg_err("too small size %d, %d LEBs contain data",
468 reserved_pebs, vol->used_ebs);
469 return -EINVAL;
470 }
471
472 /* If the size is the same, we have nothing to do */
473 if (reserved_pebs == vol->reserved_pebs)
474 return 0;
475
476 new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
477 if (!new_mapping)
478 return -ENOMEM;
479
480 for (i = 0; i < reserved_pebs; i++)
481 new_mapping[i] = UBI_LEB_UNMAPPED;
482
483 /* Reserve physical eraseblocks */
484 pebs = reserved_pebs - vol->reserved_pebs;
485 if (pebs > 0) {
486 spin_lock(&ubi->volumes_lock);
487 if (pebs > ubi->avail_pebs) {
488 dbg_err("not enough PEBs: requested %d, available %d",
489 pebs, ubi->avail_pebs);
490 spin_unlock(&ubi->volumes_lock);
491 err = -ENOSPC;
492 goto out_free;
493 }
494 ubi->avail_pebs -= pebs;
495 ubi->rsvd_pebs += pebs;
496 for (i = 0; i < vol->reserved_pebs; i++)
497 new_mapping[i] = vol->eba_tbl[i];
498 kfree(vol->eba_tbl);
499 vol->eba_tbl = new_mapping;
500 spin_unlock(&ubi->volumes_lock);
501 }
502
503 /* Change volume table record */
504 memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
3261ebd7 505 vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
801c135c
AB		 506 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
507 if (err)
508 goto out_acc;
509
510 if (pebs < 0) {
511 for (i = 0; i < -pebs; i++) {
512 err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i);
513 if (err)
514 goto out_acc;
515 }
516 spin_lock(&ubi->volumes_lock);
517 ubi->rsvd_pebs += pebs;
518 ubi->avail_pebs -= pebs;
519 pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
520 if (pebs > 0) {
521 pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
522 ubi->avail_pebs -= pebs;
523 ubi->rsvd_pebs += pebs;
524 ubi->beb_rsvd_pebs += pebs;
525 if (pebs > 0)
526 ubi_msg("reserve more %d PEBs", pebs);
527 }
528 for (i = 0; i < reserved_pebs; i++)
529 new_mapping[i] = vol->eba_tbl[i];
530 kfree(vol->eba_tbl);
531 vol->eba_tbl = new_mapping;
532 spin_unlock(&ubi->volumes_lock);
533 }
534
535 vol->reserved_pebs = reserved_pebs;
536 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
537 vol->used_ebs = reserved_pebs;
538 vol->last_eb_bytes = vol->usable_leb_size;
539 vol->used_bytes = vol->used_ebs * vol->usable_leb_size;
540 }
541
542 paranoid_check_volumes(ubi);
543 return 0;
544
545out_acc:
546 if (pebs > 0) {
547 spin_lock(&ubi->volumes_lock);
548 ubi->rsvd_pebs -= pebs;
549 ubi->avail_pebs += pebs;
550 spin_unlock(&ubi->volumes_lock);
551 }
552out_free:
553 kfree(new_mapping);
554 return err;
555}
556
557/**
558 * ubi_add_volume - add volume.
559 * @ubi: UBI device description object
560 * @vol_id: volume ID
561 *
562 * This function adds an existin volume and initializes all its data
563 * structures. Returnes zero in case of success and a negative error code in
564 * case of failure.
565 */
566int ubi_add_volume(struct ubi_device *ubi, int vol_id)
567{
568 int err;
569 struct ubi_volume *vol = ubi->volumes[vol_id];
570
571 dbg_msg("add volume %d", vol_id);
572 ubi_dbg_dump_vol_info(vol);
573 ubi_assert(vol);
574
575 /* Register character device for the volume */
576 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
577 vol->cdev.owner = THIS_MODULE;
578 err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1);
579 if (err) {
580 ubi_err("cannot add character device for volume %d", vol_id);
581 return err;
582 }
583
584 err = ubi_create_gluebi(ubi, vol);
585 if (err)
586 goto out_cdev;
587
588 vol->dev.release = vol_release;
589 vol->dev.parent = &ubi->dev;
590 vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
591 vol->dev.class = ubi_class;
592 sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
593 err = device_register(&vol->dev);
594 if (err)
595 goto out_gluebi;
596
597 err = volume_sysfs_init(ubi, vol);
598 if (err) {
599 cdev_del(&vol->cdev);
600 err = ubi_destroy_gluebi(vol);
601 volume_sysfs_close(vol);
602 return err;
603 }
604
605 paranoid_check_volumes(ubi);
606 return 0;
607
608out_gluebi:
609 err = ubi_destroy_gluebi(vol);
610out_cdev:
611 cdev_del(&vol->cdev);
612 return err;
613}
614
615/**
616 * ubi_free_volume - free volume.
617 * @ubi: UBI device description object
618 * @vol_id: volume ID
619 *
620 * This function frees all resources for volume @vol_id but does not remove it.
621 * Used only when the UBI device is detached.
622 */
623void ubi_free_volume(struct ubi_device *ubi, int vol_id)
624{
625 int err;
626 struct ubi_volume *vol = ubi->volumes[vol_id];
627
628 dbg_msg("free volume %d", vol_id);
629 ubi_assert(vol);
630
631 vol->removed = 1;
632 err = ubi_destroy_gluebi(vol);
633 ubi->volumes[vol_id] = NULL;
634 cdev_del(&vol->cdev);
635 volume_sysfs_close(vol);
636}
637
638#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
639
640/**
641 * paranoid_check_volume - check volume information.
642 * @ubi: UBI device description object
643 * @vol_id: volume ID
644 */
645static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id)
646{
647 int idx = vol_id2idx(ubi, vol_id);
648 int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
649 const struct ubi_volume *vol = ubi->volumes[idx];
650 long long n;
651 const char *name;
652
3261ebd7 653 reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
801c135c
AB		 654
655 if (!vol) {
656 if (reserved_pebs) {
657 ubi_err("no volume info, but volume exists");
658 goto fail;
659 }
660 return;
661 }
662
663 if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
664 vol->name_len < 0) {
665 ubi_err("negative values");
666 goto fail;
667 }
668 if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
669 ubi_err("bad alignment");
670 goto fail;
671 }
672
673 n = vol->alignment % ubi->min_io_size;
674 if (vol->alignment != 1 && n) {
675 ubi_err("alignment is not multiple of min I/O unit");
676 goto fail;
677 }
678
679 n = ubi->leb_size % vol->alignment;
680 if (vol->data_pad != n) {
681 ubi_err("bad data_pad, has to be %lld", n);
682 goto fail;
683 }
684
685 if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
686 vol->vol_type != UBI_STATIC_VOLUME) {
687 ubi_err("bad vol_type");
688 goto fail;
689 }
690
691 if (vol->upd_marker != 0 && vol->upd_marker != 1) {
692 ubi_err("bad upd_marker");
693 goto fail;
694 }
695
696 if (vol->upd_marker && vol->corrupted) {
697 dbg_err("update marker and corrupted simultaneously");
698 goto fail;
699 }
700
701 if (vol->reserved_pebs > ubi->good_peb_count) {
702 ubi_err("too large reserved_pebs");
703 goto fail;
704 }
705
706 n = ubi->leb_size - vol->data_pad;
707 if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
708 ubi_err("bad usable_leb_size, has to be %lld", n);
709 goto fail;
710 }
711
712 if (vol->name_len > UBI_VOL_NAME_MAX) {
713 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
714 goto fail;
715 }
716
717 if (!vol->name) {
718 ubi_err("NULL volume name");
719 goto fail;
720 }
721
722 n = strnlen(vol->name, vol->name_len + 1);
723 if (n != vol->name_len) {
724 ubi_err("bad name_len %lld", n);
725 goto fail;
726 }
727
728 n = vol->used_ebs * vol->usable_leb_size;
729 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
730 if (vol->corrupted != 0) {
731 ubi_err("corrupted dynamic volume");
732 goto fail;
733 }
734 if (vol->used_ebs != vol->reserved_pebs) {
735 ubi_err("bad used_ebs");
736 goto fail;
737 }
738 if (vol->last_eb_bytes != vol->usable_leb_size) {
739 ubi_err("bad last_eb_bytes");
740 goto fail;
741 }
742 if (vol->used_bytes != n) {
743 ubi_err("bad used_bytes");
744 goto fail;
745 }
746 } else {
747 if (vol->corrupted != 0 && vol->corrupted != 1) {
748 ubi_err("bad corrupted");
749 goto fail;
750 }
751 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
752 ubi_err("bad used_ebs");
753 goto fail;
754 }
755 if (vol->last_eb_bytes < 0 ||
756 vol->last_eb_bytes > vol->usable_leb_size) {
757 ubi_err("bad last_eb_bytes");
758 goto fail;
759 }
760 if (vol->used_bytes < 0 || vol->used_bytes > n ||
761 vol->used_bytes < n - vol->usable_leb_size) {
762 ubi_err("bad used_bytes");
763 goto fail;
764 }
765 }
766
3261ebd7
CH		 767 alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment);
768 data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad);
769 name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len);
801c135c
AB		 770 upd_marker = ubi->vtbl[vol_id].upd_marker;
771 name = &ubi->vtbl[vol_id].name[0];
772 if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
773 vol_type = UBI_DYNAMIC_VOLUME;
774 else
775 vol_type = UBI_STATIC_VOLUME;
776
777 if (alignment != vol->alignment || data_pad != vol->data_pad ||
778 upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
779 name_len!= vol->name_len || strncmp(name, vol->name, name_len)) {
780 ubi_err("volume info is different");
781 goto fail;
782 }
783
784 return;
785
786fail:
787 ubi_err("paranoid check failed");
788 ubi_dbg_dump_vol_info(vol);
789 ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
790 BUG();
791}
792
793/**
794 * paranoid_check_volumes - check information about all volumes.
795 * @ubi: UBI device description object
796 */
797static void paranoid_check_volumes(struct ubi_device *ubi)
798{
799 int i;
800
801 mutex_lock(&ubi->vtbl_mutex);
802 spin_lock(&ubi->volumes_lock);
803 for (i = 0; i < ubi->vtbl_slots; i++)
804 paranoid_check_volume(ubi, i);
805 spin_unlock(&ubi->volumes_lock);
806 mutex_unlock(&ubi->vtbl_mutex);
807}
808#endif
Linux 6.x block layer and io_uring tree(s)