blob: ea0d5c825ab41034b5dd4b91cfba6ce587680fbe [file] [log] [blame]
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001/*
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 &&
Artem Bityutskiy94784d92007-06-18 12:06:30 +0300231 !strcmp(ubi->volumes[i]->name, req->name)) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400232 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);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400246 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;
Vinit Agnihotrid08c3b72007-07-10 13:04:59 +0300283 vol->used_bytes =
284 (long long)vol->used_ebs * vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400285 } 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));
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300323 vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
324 vtbl_rec.alignment = cpu_to_be32(vol->alignment);
325 vtbl_rec.data_pad = cpu_to_be32(vol->data_pad);
326 vtbl_rec.name_len = cpu_to_be16(vol->name_len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400327 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;
Artem Bityutskiy94784d92007-06-18 12:06:30 +0300355 ubi->volumes[vol_id] = NULL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400356out_unlock:
357 spin_unlock(&ubi->volumes_lock);
358 kfree(vol);
359 return err;
360
361 /*
362 * We are registered, so @vol is destroyed in the release function and
363 * we have to de-initialize differently.
364 */
365out_sysfs:
366 err = ubi_destroy_gluebi(vol);
367 cdev_del(&vol->cdev);
368 kfree(vol->eba_tbl);
369 spin_lock(&ubi->volumes_lock);
370 ubi->rsvd_pebs -= vol->reserved_pebs;
371 ubi->avail_pebs += vol->reserved_pebs;
Artem Bityutskiy94784d92007-06-18 12:06:30 +0300372 ubi->volumes[vol_id] = NULL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400373 spin_unlock(&ubi->volumes_lock);
374 volume_sysfs_close(vol);
375 return err;
376}
377
378/**
379 * ubi_remove_volume - remove volume.
380 * @desc: volume descriptor
381 *
382 * This function removes volume described by @desc. The volume has to be opened
383 * in "exclusive" mode. Returns zero in case of success and a negative error
384 * code in case of failure.
385 */
386int ubi_remove_volume(struct ubi_volume_desc *desc)
387{
388 struct ubi_volume *vol = desc->vol;
389 struct ubi_device *ubi = vol->ubi;
390 int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
391
392 dbg_msg("remove UBI volume %d", vol_id);
393 ubi_assert(desc->mode == UBI_EXCLUSIVE);
394 ubi_assert(vol == ubi->volumes[vol_id]);
395
396 if (ubi->ro_mode)
397 return -EROFS;
398
399 err = ubi_destroy_gluebi(vol);
400 if (err)
401 return err;
402
403 err = ubi_change_vtbl_record(ubi, vol_id, NULL);
404 if (err)
405 return err;
406
407 for (i = 0; i < vol->reserved_pebs; i++) {
408 err = ubi_eba_unmap_leb(ubi, vol_id, i);
409 if (err)
410 return err;
411 }
412
413 spin_lock(&ubi->volumes_lock);
414 vol->removed = 1;
415 ubi->volumes[vol_id] = NULL;
416 spin_unlock(&ubi->volumes_lock);
417
418 kfree(vol->eba_tbl);
419 vol->eba_tbl = NULL;
420 cdev_del(&vol->cdev);
421 volume_sysfs_close(vol);
422 kfree(desc);
423
424 spin_lock(&ubi->volumes_lock);
425 ubi->rsvd_pebs -= reserved_pebs;
426 ubi->avail_pebs += reserved_pebs;
427 i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
428 if (i > 0) {
429 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
430 ubi->avail_pebs -= i;
431 ubi->rsvd_pebs += i;
432 ubi->beb_rsvd_pebs += i;
433 if (i > 0)
434 ubi_msg("reserve more %d PEBs", i);
435 }
436 ubi->vol_count -= 1;
437 spin_unlock(&ubi->volumes_lock);
438
439 paranoid_check_volumes(ubi);
440 module_put(THIS_MODULE);
441 return 0;
442}
443
444/**
445 * ubi_resize_volume - re-size volume.
446 * @desc: volume descriptor
447 * @reserved_pebs: new size in physical eraseblocks
448 *
449 * This function returns zero in case of success, and a negative error code in
450 * case of failure.
451 */
452int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
453{
454 int i, err, pebs, *new_mapping;
455 struct ubi_volume *vol = desc->vol;
456 struct ubi_device *ubi = vol->ubi;
457 struct ubi_vtbl_record vtbl_rec;
458 int vol_id = vol->vol_id;
459
460 if (ubi->ro_mode)
461 return -EROFS;
462
463 dbg_msg("re-size volume %d to from %d to %d PEBs",
464 vol_id, vol->reserved_pebs, reserved_pebs);
465 ubi_assert(desc->mode == UBI_EXCLUSIVE);
466 ubi_assert(vol == ubi->volumes[vol_id]);
467
468 if (vol->vol_type == UBI_STATIC_VOLUME &&
469 reserved_pebs < vol->used_ebs) {
470 dbg_err("too small size %d, %d LEBs contain data",
471 reserved_pebs, vol->used_ebs);
472 return -EINVAL;
473 }
474
475 /* If the size is the same, we have nothing to do */
476 if (reserved_pebs == vol->reserved_pebs)
477 return 0;
478
479 new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
480 if (!new_mapping)
481 return -ENOMEM;
482
483 for (i = 0; i < reserved_pebs; i++)
484 new_mapping[i] = UBI_LEB_UNMAPPED;
485
486 /* Reserve physical eraseblocks */
487 pebs = reserved_pebs - vol->reserved_pebs;
488 if (pebs > 0) {
489 spin_lock(&ubi->volumes_lock);
490 if (pebs > ubi->avail_pebs) {
491 dbg_err("not enough PEBs: requested %d, available %d",
492 pebs, ubi->avail_pebs);
493 spin_unlock(&ubi->volumes_lock);
494 err = -ENOSPC;
495 goto out_free;
496 }
497 ubi->avail_pebs -= pebs;
498 ubi->rsvd_pebs += pebs;
499 for (i = 0; i < vol->reserved_pebs; i++)
500 new_mapping[i] = vol->eba_tbl[i];
501 kfree(vol->eba_tbl);
502 vol->eba_tbl = new_mapping;
503 spin_unlock(&ubi->volumes_lock);
504 }
505
506 /* Change volume table record */
507 memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300508 vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400509 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
510 if (err)
511 goto out_acc;
512
513 if (pebs < 0) {
514 for (i = 0; i < -pebs; i++) {
515 err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i);
516 if (err)
517 goto out_acc;
518 }
519 spin_lock(&ubi->volumes_lock);
520 ubi->rsvd_pebs += pebs;
521 ubi->avail_pebs -= pebs;
522 pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
523 if (pebs > 0) {
524 pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
525 ubi->avail_pebs -= pebs;
526 ubi->rsvd_pebs += pebs;
527 ubi->beb_rsvd_pebs += pebs;
528 if (pebs > 0)
529 ubi_msg("reserve more %d PEBs", pebs);
530 }
531 for (i = 0; i < reserved_pebs; i++)
532 new_mapping[i] = vol->eba_tbl[i];
533 kfree(vol->eba_tbl);
534 vol->eba_tbl = new_mapping;
535 spin_unlock(&ubi->volumes_lock);
536 }
537
538 vol->reserved_pebs = reserved_pebs;
539 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
540 vol->used_ebs = reserved_pebs;
541 vol->last_eb_bytes = vol->usable_leb_size;
Vinit Agnihotrid08c3b72007-07-10 13:04:59 +0300542 vol->used_bytes =
543 (long long)vol->used_ebs * vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400544 }
545
546 paranoid_check_volumes(ubi);
547 return 0;
548
549out_acc:
550 if (pebs > 0) {
551 spin_lock(&ubi->volumes_lock);
552 ubi->rsvd_pebs -= pebs;
553 ubi->avail_pebs += pebs;
554 spin_unlock(&ubi->volumes_lock);
555 }
556out_free:
557 kfree(new_mapping);
558 return err;
559}
560
561/**
562 * ubi_add_volume - add volume.
563 * @ubi: UBI device description object
564 * @vol_id: volume ID
565 *
566 * This function adds an existin volume and initializes all its data
567 * structures. Returnes zero in case of success and a negative error code in
568 * case of failure.
569 */
570int ubi_add_volume(struct ubi_device *ubi, int vol_id)
571{
572 int err;
573 struct ubi_volume *vol = ubi->volumes[vol_id];
574
575 dbg_msg("add volume %d", vol_id);
576 ubi_dbg_dump_vol_info(vol);
577 ubi_assert(vol);
578
579 /* Register character device for the volume */
580 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
581 vol->cdev.owner = THIS_MODULE;
582 err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1);
583 if (err) {
584 ubi_err("cannot add character device for volume %d", vol_id);
585 return err;
586 }
587
588 err = ubi_create_gluebi(ubi, vol);
589 if (err)
590 goto out_cdev;
591
592 vol->dev.release = vol_release;
593 vol->dev.parent = &ubi->dev;
594 vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1);
595 vol->dev.class = ubi_class;
596 sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id);
597 err = device_register(&vol->dev);
598 if (err)
599 goto out_gluebi;
600
601 err = volume_sysfs_init(ubi, vol);
602 if (err) {
603 cdev_del(&vol->cdev);
604 err = ubi_destroy_gluebi(vol);
605 volume_sysfs_close(vol);
606 return err;
607 }
608
609 paranoid_check_volumes(ubi);
610 return 0;
611
612out_gluebi:
613 err = ubi_destroy_gluebi(vol);
614out_cdev:
615 cdev_del(&vol->cdev);
616 return err;
617}
618
619/**
620 * ubi_free_volume - free volume.
621 * @ubi: UBI device description object
622 * @vol_id: volume ID
623 *
624 * This function frees all resources for volume @vol_id but does not remove it.
625 * Used only when the UBI device is detached.
626 */
627void ubi_free_volume(struct ubi_device *ubi, int vol_id)
628{
629 int err;
630 struct ubi_volume *vol = ubi->volumes[vol_id];
631
632 dbg_msg("free volume %d", vol_id);
633 ubi_assert(vol);
634
635 vol->removed = 1;
636 err = ubi_destroy_gluebi(vol);
637 ubi->volumes[vol_id] = NULL;
638 cdev_del(&vol->cdev);
639 volume_sysfs_close(vol);
640}
641
642#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
643
644/**
645 * paranoid_check_volume - check volume information.
646 * @ubi: UBI device description object
647 * @vol_id: volume ID
648 */
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300649static void paranoid_check_volume(struct ubi_device *ubi, int vol_id)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400650{
651 int idx = vol_id2idx(ubi, vol_id);
652 int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300653 const struct ubi_volume *vol;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400654 long long n;
655 const char *name;
656
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300657 spin_lock(&ubi->volumes_lock);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300658 reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300659 vol = ubi->volumes[idx];
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400660
661 if (!vol) {
662 if (reserved_pebs) {
663 ubi_err("no volume info, but volume exists");
664 goto fail;
665 }
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300666 spin_unlock(&ubi->volumes_lock);
667 return;
668 }
669
670 if (vol->exclusive) {
671 /*
672 * The volume may be being created at the moment, do not check
673 * it (e.g., it may be in the middle of ubi_create_volume().
674 */
675 spin_unlock(&ubi->volumes_lock);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400676 return;
677 }
678
679 if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
680 vol->name_len < 0) {
681 ubi_err("negative values");
682 goto fail;
683 }
684 if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
685 ubi_err("bad alignment");
686 goto fail;
687 }
688
689 n = vol->alignment % ubi->min_io_size;
690 if (vol->alignment != 1 && n) {
691 ubi_err("alignment is not multiple of min I/O unit");
692 goto fail;
693 }
694
695 n = ubi->leb_size % vol->alignment;
696 if (vol->data_pad != n) {
697 ubi_err("bad data_pad, has to be %lld", n);
698 goto fail;
699 }
700
701 if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
702 vol->vol_type != UBI_STATIC_VOLUME) {
703 ubi_err("bad vol_type");
704 goto fail;
705 }
706
707 if (vol->upd_marker != 0 && vol->upd_marker != 1) {
708 ubi_err("bad upd_marker");
709 goto fail;
710 }
711
712 if (vol->upd_marker && vol->corrupted) {
713 dbg_err("update marker and corrupted simultaneously");
714 goto fail;
715 }
716
717 if (vol->reserved_pebs > ubi->good_peb_count) {
718 ubi_err("too large reserved_pebs");
719 goto fail;
720 }
721
722 n = ubi->leb_size - vol->data_pad;
723 if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
724 ubi_err("bad usable_leb_size, has to be %lld", n);
725 goto fail;
726 }
727
728 if (vol->name_len > UBI_VOL_NAME_MAX) {
729 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
730 goto fail;
731 }
732
733 if (!vol->name) {
734 ubi_err("NULL volume name");
735 goto fail;
736 }
737
738 n = strnlen(vol->name, vol->name_len + 1);
739 if (n != vol->name_len) {
740 ubi_err("bad name_len %lld", n);
741 goto fail;
742 }
743
Vinit Agnihotrid08c3b72007-07-10 13:04:59 +0300744 n = (long long)vol->used_ebs * vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400745 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
746 if (vol->corrupted != 0) {
747 ubi_err("corrupted dynamic volume");
748 goto fail;
749 }
750 if (vol->used_ebs != vol->reserved_pebs) {
751 ubi_err("bad used_ebs");
752 goto fail;
753 }
754 if (vol->last_eb_bytes != vol->usable_leb_size) {
755 ubi_err("bad last_eb_bytes");
756 goto fail;
757 }
758 if (vol->used_bytes != n) {
759 ubi_err("bad used_bytes");
760 goto fail;
761 }
762 } else {
763 if (vol->corrupted != 0 && vol->corrupted != 1) {
764 ubi_err("bad corrupted");
765 goto fail;
766 }
767 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
768 ubi_err("bad used_ebs");
769 goto fail;
770 }
771 if (vol->last_eb_bytes < 0 ||
772 vol->last_eb_bytes > vol->usable_leb_size) {
773 ubi_err("bad last_eb_bytes");
774 goto fail;
775 }
776 if (vol->used_bytes < 0 || vol->used_bytes > n ||
777 vol->used_bytes < n - vol->usable_leb_size) {
778 ubi_err("bad used_bytes");
779 goto fail;
780 }
781 }
782
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300783 alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment);
784 data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad);
785 name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400786 upd_marker = ubi->vtbl[vol_id].upd_marker;
787 name = &ubi->vtbl[vol_id].name[0];
788 if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
789 vol_type = UBI_DYNAMIC_VOLUME;
790 else
791 vol_type = UBI_STATIC_VOLUME;
792
793 if (alignment != vol->alignment || data_pad != vol->data_pad ||
794 upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
795 name_len!= vol->name_len || strncmp(name, vol->name, name_len)) {
796 ubi_err("volume info is different");
797 goto fail;
798 }
799
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300800 spin_unlock(&ubi->volumes_lock);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400801 return;
802
803fail:
Artem Bityutskiy94784d92007-06-18 12:06:30 +0300804 ubi_err("paranoid check failed for volume %d", vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400805 ubi_dbg_dump_vol_info(vol);
806 ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300807 spin_unlock(&ubi->volumes_lock);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400808 BUG();
809}
810
811/**
812 * paranoid_check_volumes - check information about all volumes.
813 * @ubi: UBI device description object
814 */
815static void paranoid_check_volumes(struct ubi_device *ubi)
816{
817 int i;
818
819 mutex_lock(&ubi->vtbl_mutex);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400820 for (i = 0; i < ubi->vtbl_slots; i++)
821 paranoid_check_volume(ubi, i);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400822 mutex_unlock(&ubi->vtbl_mutex);
823}
824#endif