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-rw-r--r--drivers/mtd/ubi/vmt.c809
1 files changed, 809 insertions, 0 deletions
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
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index 000000000000..622d0d18952c
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+++ b/drivers/mtd/ubi/vmt.c
@@ -0,0 +1,809 @@
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);
246 spin_unlock(&ubi->volumes_lock);
247 err = -ENOSPC;
248 goto out_unlock;
249 }
250 ubi->avail_pebs -= vol->reserved_pebs;
251 ubi->rsvd_pebs += vol->reserved_pebs;
252
253 vol->vol_id = vol_id;
254 vol->alignment = req->alignment;
255 vol->data_pad = ubi->leb_size % vol->alignment;
256 vol->vol_type = req->vol_type;
257 vol->name_len = req->name_len;
258 memcpy(vol->name, req->name, vol->name_len + 1);
259 vol->exclusive = 1;
260 vol->ubi = ubi;
261 ubi->volumes[vol_id] = vol;
262 spin_unlock(&ubi->volumes_lock);
263
264 /*
265 * Finish all pending erases because there may be some LEBs belonging
266 * to the same volume ID.
267 */
268 err = ubi_wl_flush(ubi);
269 if (err)
270 goto out_acc;
271
272 vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
273 if (!vol->eba_tbl) {
274 err = -ENOMEM;
275 goto out_acc;
276 }
277
278 for (i = 0; i < vol->reserved_pebs; i++)
279 vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
280
281 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
282 vol->used_ebs = vol->reserved_pebs;
283 vol->last_eb_bytes = vol->usable_leb_size;
284 vol->used_bytes = vol->used_ebs * vol->usable_leb_size;
285 } else {
286 bytes = vol->used_bytes;
287 vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size);
288 vol->used_ebs = bytes;
289 if (vol->last_eb_bytes)
290 vol->used_ebs += 1;
291 else
292 vol->last_eb_bytes = vol->usable_leb_size;
293 }
294
295 /* Register character device for the volume */
296 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
297 vol->cdev.owner = THIS_MODULE;
298 err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol_id + 1), 1);
299 if (err) {
300 ubi_err("cannot add character device for volume %d", vol_id);
301 goto out_mapping;
302 }
303
304 err = ubi_create_gluebi(ubi, vol);
305 if (err)
306 goto out_cdev;
307
308 vol->dev.release = vol_release;
309 vol->dev.parent = &ubi->dev;
310 vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
311 vol->dev.class = ubi_class;
312 sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
313 err = device_register(&vol->dev);
314 if (err)
315 goto out_gluebi;
316
317 err = volume_sysfs_init(ubi, vol);
318 if (err)
319 goto out_sysfs;
320
321 /* Fill volume table record */
322 memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
323 vtbl_rec.reserved_pebs = cpu_to_ubi32(vol->reserved_pebs);
324 vtbl_rec.alignment = cpu_to_ubi32(vol->alignment);
325 vtbl_rec.data_pad = cpu_to_ubi32(vol->data_pad);
326 vtbl_rec.name_len = cpu_to_ubi16(vol->name_len);
327 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
328 vtbl_rec.vol_type = UBI_VID_DYNAMIC;
329 else
330 vtbl_rec.vol_type = UBI_VID_STATIC;
331 memcpy(vtbl_rec.name, vol->name, vol->name_len + 1);
332
333 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
334 if (err)
335 goto out_sysfs;
336
337 spin_lock(&ubi->volumes_lock);
338 ubi->vol_count += 1;
339 vol->exclusive = 0;
340 spin_unlock(&ubi->volumes_lock);
341
342 paranoid_check_volumes(ubi);
343 return 0;
344
345out_gluebi:
346 err = ubi_destroy_gluebi(vol);
347out_cdev:
348 cdev_del(&vol->cdev);
349out_mapping:
350 kfree(vol->eba_tbl);
351out_acc:
352 spin_lock(&ubi->volumes_lock);
353 ubi->rsvd_pebs -= vol->reserved_pebs;
354 ubi->avail_pebs += vol->reserved_pebs;
355out_unlock:
356 spin_unlock(&ubi->volumes_lock);
357 kfree(vol);
358 return err;
359
360 /*
361 * We are registered, so @vol is destroyed in the release function and
362 * we have to de-initialize differently.
363 */
364out_sysfs:
365 err = ubi_destroy_gluebi(vol);
366 cdev_del(&vol->cdev);
367 kfree(vol->eba_tbl);
368 spin_lock(&ubi->volumes_lock);
369 ubi->rsvd_pebs -= vol->reserved_pebs;
370 ubi->avail_pebs += vol->reserved_pebs;
371 spin_unlock(&ubi->volumes_lock);
372 volume_sysfs_close(vol);
373 return err;
374}
375
376/**
377 * ubi_remove_volume - remove volume.
378 * @desc: volume descriptor
379 *
380 * This function removes volume described by @desc. The volume has to be opened
381 * in "exclusive" mode. Returns zero in case of success and a negative error
382 * code in case of failure.
383 */
384int ubi_remove_volume(struct ubi_volume_desc *desc)
385{
386 struct ubi_volume *vol = desc->vol;
387 struct ubi_device *ubi = vol->ubi;
388 int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
389
390 dbg_msg("remove UBI volume %d", vol_id);
391 ubi_assert(desc->mode == UBI_EXCLUSIVE);
392 ubi_assert(vol == ubi->volumes[vol_id]);
393
394 if (ubi->ro_mode)
395 return -EROFS;
396
397 err = ubi_destroy_gluebi(vol);
398 if (err)
399 return err;
400
401 err = ubi_change_vtbl_record(ubi, vol_id, NULL);
402 if (err)
403 return err;
404
405 for (i = 0; i < vol->reserved_pebs; i++) {
406 err = ubi_eba_unmap_leb(ubi, vol_id, i);
407 if (err)
408 return err;
409 }
410
411 spin_lock(&ubi->volumes_lock);
412 vol->removed = 1;
413 ubi->volumes[vol_id] = NULL;
414 spin_unlock(&ubi->volumes_lock);
415
416 kfree(vol->eba_tbl);
417 vol->eba_tbl = NULL;
418 cdev_del(&vol->cdev);
419 volume_sysfs_close(vol);
420 kfree(desc);
421
422 spin_lock(&ubi->volumes_lock);
423 ubi->rsvd_pebs -= reserved_pebs;
424 ubi->avail_pebs += reserved_pebs;
425 i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
426 if (i > 0) {
427 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
428 ubi->avail_pebs -= i;
429 ubi->rsvd_pebs += i;
430 ubi->beb_rsvd_pebs += i;
431 if (i > 0)
432 ubi_msg("reserve more %d PEBs", i);
433 }
434 ubi->vol_count -= 1;
435 spin_unlock(&ubi->volumes_lock);
436
437 paranoid_check_volumes(ubi);
438 module_put(THIS_MODULE);
439 return 0;
440}
441
442/**
443 * ubi_resize_volume - re-size volume.
444 * @desc: volume descriptor
445 * @reserved_pebs: new size in physical eraseblocks
446 *
447 * This function returns zero in case of success, and a negative error code in
448 * case of failure.
449 */
450int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
451{
452 int i, err, pebs, *new_mapping;
453 struct ubi_volume *vol = desc->vol;
454 struct ubi_device *ubi = vol->ubi;
455 struct ubi_vtbl_record vtbl_rec;
456 int vol_id = vol->vol_id;
457
458 if (ubi->ro_mode)
459 return -EROFS;
460
461 dbg_msg("re-size volume %d to from %d to %d PEBs",
462 vol_id, vol->reserved_pebs, reserved_pebs);
463 ubi_assert(desc->mode == UBI_EXCLUSIVE);
464 ubi_assert(vol == ubi->volumes[vol_id]);
465
466 if (vol->vol_type == UBI_STATIC_VOLUME &&
467 reserved_pebs < vol->used_ebs) {
468 dbg_err("too small size %d, %d LEBs contain data",
469 reserved_pebs, vol->used_ebs);
470 return -EINVAL;
471 }
472
473 /* If the size is the same, we have nothing to do */
474 if (reserved_pebs == vol->reserved_pebs)
475 return 0;
476
477 new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
478 if (!new_mapping)
479 return -ENOMEM;
480
481 for (i = 0; i < reserved_pebs; i++)
482 new_mapping[i] = UBI_LEB_UNMAPPED;
483
484 /* Reserve physical eraseblocks */
485 pebs = reserved_pebs - vol->reserved_pebs;
486 if (pebs > 0) {
487 spin_lock(&ubi->volumes_lock);
488 if (pebs > ubi->avail_pebs) {
489 dbg_err("not enough PEBs: requested %d, available %d",
490 pebs, ubi->avail_pebs);
491 spin_unlock(&ubi->volumes_lock);
492 err = -ENOSPC;
493 goto out_free;
494 }
495 ubi->avail_pebs -= pebs;
496 ubi->rsvd_pebs += pebs;
497 for (i = 0; i < vol->reserved_pebs; i++)
498 new_mapping[i] = vol->eba_tbl[i];
499 kfree(vol->eba_tbl);
500 vol->eba_tbl = new_mapping;
501 spin_unlock(&ubi->volumes_lock);
502 }
503
504 /* Change volume table record */
505 memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
506 vtbl_rec.reserved_pebs = cpu_to_ubi32(reserved_pebs);
507 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
508 if (err)
509 goto out_acc;
510
511 if (pebs < 0) {
512 for (i = 0; i < -pebs; i++) {
513 err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i);
514 if (err)
515 goto out_acc;
516 }
517 spin_lock(&ubi->volumes_lock);
518 ubi->rsvd_pebs += pebs;
519 ubi->avail_pebs -= pebs;
520 pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
521 if (pebs > 0) {
522 pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
523 ubi->avail_pebs -= pebs;
524 ubi->rsvd_pebs += pebs;
525 ubi->beb_rsvd_pebs += pebs;
526 if (pebs > 0)
527 ubi_msg("reserve more %d PEBs", pebs);
528 }
529 for (i = 0; i < reserved_pebs; i++)
530 new_mapping[i] = vol->eba_tbl[i];
531 kfree(vol->eba_tbl);
532 vol->eba_tbl = new_mapping;
533 spin_unlock(&ubi->volumes_lock);
534 }
535
536 vol->reserved_pebs = reserved_pebs;
537 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
538 vol->used_ebs = reserved_pebs;
539 vol->last_eb_bytes = vol->usable_leb_size;
540 vol->used_bytes = vol->used_ebs * vol->usable_leb_size;
541 }
542
543 paranoid_check_volumes(ubi);
544 return 0;
545
546out_acc:
547 if (pebs > 0) {
548 spin_lock(&ubi->volumes_lock);
549 ubi->rsvd_pebs -= pebs;
550 ubi->avail_pebs += pebs;
551 spin_unlock(&ubi->volumes_lock);
552 }
553out_free:
554 kfree(new_mapping);
555 return err;
556}
557
558/**
559 * ubi_add_volume - add volume.
560 * @ubi: UBI device description object
561 * @vol_id: volume ID
562 *
563 * This function adds an existin volume and initializes all its data
564 * structures. Returnes zero in case of success and a negative error code in
565 * case of failure.
566 */
567int ubi_add_volume(struct ubi_device *ubi, int vol_id)
568{
569 int err;
570 struct ubi_volume *vol = ubi->volumes[vol_id];
571
572 dbg_msg("add volume %d", vol_id);
573 ubi_dbg_dump_vol_info(vol);
574 ubi_assert(vol);
575
576 /* Register character device for the volume */
577 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
578 vol->cdev.owner = THIS_MODULE;
579 err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1);
580 if (err) {
581 ubi_err("cannot add character device for volume %d", vol_id);
582 return err;
583 }
584
585 err = ubi_create_gluebi(ubi, vol);
586 if (err)
587 goto out_cdev;
588
589 vol->dev.release = vol_release;
590 vol->dev.parent = &ubi->dev;
591 vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
592 vol->dev.class = ubi_class;
593 sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
594 err = device_register(&vol->dev);
595 if (err)
596 goto out_gluebi;
597
598 err = volume_sysfs_init(ubi, vol);
599 if (err) {
600 cdev_del(&vol->cdev);
601 err = ubi_destroy_gluebi(vol);
602 volume_sysfs_close(vol);
603 return err;
604 }
605
606 paranoid_check_volumes(ubi);
607 return 0;
608
609out_gluebi:
610 err = ubi_destroy_gluebi(vol);
611out_cdev:
612 cdev_del(&vol->cdev);
613 return err;
614}
615
616/**
617 * ubi_free_volume - free volume.
618 * @ubi: UBI device description object
619 * @vol_id: volume ID
620 *
621 * This function frees all resources for volume @vol_id but does not remove it.
622 * Used only when the UBI device is detached.
623 */
624void ubi_free_volume(struct ubi_device *ubi, int vol_id)
625{
626 int err;
627 struct ubi_volume *vol = ubi->volumes[vol_id];
628
629 dbg_msg("free volume %d", vol_id);
630 ubi_assert(vol);
631
632 vol->removed = 1;
633 err = ubi_destroy_gluebi(vol);
634 ubi->volumes[vol_id] = NULL;
635 cdev_del(&vol->cdev);
636 volume_sysfs_close(vol);
637}
638
639#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
640
641/**
642 * paranoid_check_volume - check volume information.
643 * @ubi: UBI device description object
644 * @vol_id: volume ID
645 */
646static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id)
647{
648 int idx = vol_id2idx(ubi, vol_id);
649 int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
650 const struct ubi_volume *vol = ubi->volumes[idx];
651 long long n;
652 const char *name;
653
654 reserved_pebs = ubi32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
655
656 if (!vol) {
657 if (reserved_pebs) {
658 ubi_err("no volume info, but volume exists");
659 goto fail;
660 }
661 return;
662 }
663
664 if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
665 vol->name_len < 0) {
666 ubi_err("negative values");
667 goto fail;
668 }
669 if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
670 ubi_err("bad alignment");
671 goto fail;
672 }
673
674 n = vol->alignment % ubi->min_io_size;
675 if (vol->alignment != 1 && n) {
676 ubi_err("alignment is not multiple of min I/O unit");
677 goto fail;
678 }
679
680 n = ubi->leb_size % vol->alignment;
681 if (vol->data_pad != n) {
682 ubi_err("bad data_pad, has to be %lld", n);
683 goto fail;
684 }
685
686 if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
687 vol->vol_type != UBI_STATIC_VOLUME) {
688 ubi_err("bad vol_type");
689 goto fail;
690 }
691
692 if (vol->upd_marker != 0 && vol->upd_marker != 1) {
693 ubi_err("bad upd_marker");
694 goto fail;
695 }
696
697 if (vol->upd_marker && vol->corrupted) {
698 dbg_err("update marker and corrupted simultaneously");
699 goto fail;
700 }
701
702 if (vol->reserved_pebs > ubi->good_peb_count) {
703 ubi_err("too large reserved_pebs");
704 goto fail;
705 }
706
707 n = ubi->leb_size - vol->data_pad;
708 if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
709 ubi_err("bad usable_leb_size, has to be %lld", n);
710 goto fail;
711 }
712
713 if (vol->name_len > UBI_VOL_NAME_MAX) {
714 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
715 goto fail;
716 }
717
718 if (!vol->name) {
719 ubi_err("NULL volume name");
720 goto fail;
721 }
722
723 n = strnlen(vol->name, vol->name_len + 1);
724 if (n != vol->name_len) {
725 ubi_err("bad name_len %lld", n);
726 goto fail;
727 }
728
729 n = vol->used_ebs * vol->usable_leb_size;
730 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
731 if (vol->corrupted != 0) {
732 ubi_err("corrupted dynamic volume");
733 goto fail;
734 }
735 if (vol->used_ebs != vol->reserved_pebs) {
736 ubi_err("bad used_ebs");
737 goto fail;
738 }
739 if (vol->last_eb_bytes != vol->usable_leb_size) {
740 ubi_err("bad last_eb_bytes");
741 goto fail;
742 }
743 if (vol->used_bytes != n) {
744 ubi_err("bad used_bytes");
745 goto fail;
746 }
747 } else {
748 if (vol->corrupted != 0 && vol->corrupted != 1) {
749 ubi_err("bad corrupted");
750 goto fail;
751 }
752 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
753 ubi_err("bad used_ebs");
754 goto fail;
755 }
756 if (vol->last_eb_bytes < 0 ||
757 vol->last_eb_bytes > vol->usable_leb_size) {
758 ubi_err("bad last_eb_bytes");
759 goto fail;
760 }
761 if (vol->used_bytes < 0 || vol->used_bytes > n ||
762 vol->used_bytes < n - vol->usable_leb_size) {
763 ubi_err("bad used_bytes");
764 goto fail;
765 }
766 }
767
768 alignment = ubi32_to_cpu(ubi->vtbl[vol_id].alignment);
769 data_pad = ubi32_to_cpu(ubi->vtbl[vol_id].data_pad);
770 name_len = ubi16_to_cpu(ubi->vtbl[vol_id].name_len);
771 upd_marker = ubi->vtbl[vol_id].upd_marker;
772 name = &ubi->vtbl[vol_id].name[0];
773 if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
774 vol_type = UBI_DYNAMIC_VOLUME;
775 else
776 vol_type = UBI_STATIC_VOLUME;
777
778 if (alignment != vol->alignment || data_pad != vol->data_pad ||
779 upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
780 name_len!= vol->name_len || strncmp(name, vol->name, name_len)) {
781 ubi_err("volume info is different");
782 goto fail;
783 }
784
785 return;
786
787fail:
788 ubi_err("paranoid check failed");
789 ubi_dbg_dump_vol_info(vol);
790 ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
791 BUG();
792}
793
794/**
795 * paranoid_check_volumes - check information about all volumes.
796 * @ubi: UBI device description object
797 */
798static void paranoid_check_volumes(struct ubi_device *ubi)
799{
800 int i;
801
802 mutex_lock(&ubi->vtbl_mutex);
803 spin_lock(&ubi->volumes_lock);
804 for (i = 0; i < ubi->vtbl_slots; i++)
805 paranoid_check_volume(ubi, i);
806 spin_unlock(&ubi->volumes_lock);
807 mutex_unlock(&ubi->vtbl_mutex);
808}
809#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 02:59:01 -0500