blob: e42afab9a9fe2c290585a0f3111ca2543581a7ee [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>
Artem Bityutskiy3013ee32009-01-16 19:08:43 +020027#include <linux/math64.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040029#include "ubi.h"
30
31#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
Artem Bityutskiyc8566352008-07-16 17:40:22 +030032static int paranoid_check_volumes(struct ubi_device *ubi);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040033#else
Artem Bityutskiyc8566352008-07-16 17:40:22 +030034#define paranoid_check_volumes(ubi) 0
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040035#endif
36
37static ssize_t vol_attribute_show(struct device *dev,
38 struct device_attribute *attr, char *buf);
39
40/* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030041static struct device_attribute attr_vol_reserved_ebs =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040042 __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030043static struct device_attribute attr_vol_type =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040044 __ATTR(type, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030045static struct device_attribute attr_vol_name =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040046 __ATTR(name, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030047static struct device_attribute attr_vol_corrupted =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040048 __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030049static struct device_attribute attr_vol_alignment =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040050 __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030051static struct device_attribute attr_vol_usable_eb_size =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040052 __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030053static struct device_attribute attr_vol_data_bytes =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040054 __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030055static struct device_attribute attr_vol_upd_marker =
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040056 __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL);
57
58/*
59 * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'.
60 *
61 * Consider a situation:
62 * A. process 1 opens a sysfs file related to volume Y, say
63 * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs;
64 * B. process 2 removes volume Y;
65 * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file;
66 *
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +020067 * In this situation, this function will return %-ENODEV because it will find
68 * out that the volume was removed from the @ubi->volumes array.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040069 */
70static ssize_t vol_attribute_show(struct device *dev,
71 struct device_attribute *attr, char *buf)
72{
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +020073 int ret;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040074 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
Artem Bityutskiye73f4452007-12-17 17:37:26 +020075 struct ubi_device *ubi;
76
77 ubi = ubi_get_device(vol->ubi->ubi_num);
78 if (!ubi)
79 return -ENODEV;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040080
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +020081 spin_lock(&ubi->volumes_lock);
82 if (!ubi->volumes[vol->vol_id]) {
83 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiye73f4452007-12-17 17:37:26 +020084 ubi_put_device(ubi);
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +020085 return -ENODEV;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040086 }
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +020087 /* Take a reference to prevent volume removal */
88 vol->ref_count += 1;
89 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiy732aeac2007-12-15 15:09:07 +020090
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030091 if (attr == &attr_vol_reserved_ebs)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040092 ret = sprintf(buf, "%d\n", vol->reserved_pebs);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030093 else if (attr == &attr_vol_type) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040094 const char *tp;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +030095
96 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
97 tp = "dynamic";
98 else
99 tp = "static";
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400100 ret = sprintf(buf, "%s\n", tp);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300101 } else if (attr == &attr_vol_name)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400102 ret = sprintf(buf, "%s\n", vol->name);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300103 else if (attr == &attr_vol_corrupted)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400104 ret = sprintf(buf, "%d\n", vol->corrupted);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300105 else if (attr == &attr_vol_alignment)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400106 ret = sprintf(buf, "%d\n", vol->alignment);
Artem Bityutskiy732aeac2007-12-15 15:09:07 +0200107 else if (attr == &attr_vol_usable_eb_size)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400108 ret = sprintf(buf, "%d\n", vol->usable_leb_size);
Artem Bityutskiy732aeac2007-12-15 15:09:07 +0200109 else if (attr == &attr_vol_data_bytes)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400110 ret = sprintf(buf, "%lld\n", vol->used_bytes);
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300111 else if (attr == &attr_vol_upd_marker)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400112 ret = sprintf(buf, "%d\n", vol->upd_marker);
113 else
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200114 /* This must be a bug */
115 ret = -EINVAL;
116
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200117 /* We've done the operation, drop volume and UBI device references */
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200118 spin_lock(&ubi->volumes_lock);
119 vol->ref_count -= 1;
120 ubi_assert(vol->ref_count >= 0);
121 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200122 ubi_put_device(ubi);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400123 return ret;
124}
125
126/* Release method for volume devices */
127static void vol_release(struct device *dev)
128{
129 struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev);
Artem Bityutskiy732aeac2007-12-15 15:09:07 +0200130
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300131 kfree(vol->eba_tbl);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400132 kfree(vol);
133}
134
135/**
136 * volume_sysfs_init - initialize sysfs for new volume.
137 * @ubi: UBI device description object
138 * @vol: volume description object
139 *
140 * This function returns zero in case of success and a negative error code in
141 * case of failure.
142 *
143 * Note, this function does not free allocated resources in case of failure -
144 * the caller does it. This is because this would cause release() here and the
145 * caller would oops.
146 */
147static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol)
148{
149 int err;
150
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300151 err = device_create_file(&vol->dev, &attr_vol_reserved_ebs);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400152 if (err)
153 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300154 err = device_create_file(&vol->dev, &attr_vol_type);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400155 if (err)
156 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300157 err = device_create_file(&vol->dev, &attr_vol_name);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400158 if (err)
159 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300160 err = device_create_file(&vol->dev, &attr_vol_corrupted);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400161 if (err)
162 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300163 err = device_create_file(&vol->dev, &attr_vol_alignment);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400164 if (err)
165 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300166 err = device_create_file(&vol->dev, &attr_vol_usable_eb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400167 if (err)
168 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300169 err = device_create_file(&vol->dev, &attr_vol_data_bytes);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400170 if (err)
171 return err;
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300172 err = device_create_file(&vol->dev, &attr_vol_upd_marker);
Artem Bityutskiyfc75a1e2007-12-17 14:02:09 +0200173 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400174}
175
176/**
177 * volume_sysfs_close - close sysfs for a volume.
178 * @vol: volume description object
179 */
180static void volume_sysfs_close(struct ubi_volume *vol)
181{
Artem Bityutskiy8bc22962007-07-22 15:25:02 +0300182 device_remove_file(&vol->dev, &attr_vol_upd_marker);
183 device_remove_file(&vol->dev, &attr_vol_data_bytes);
184 device_remove_file(&vol->dev, &attr_vol_usable_eb_size);
185 device_remove_file(&vol->dev, &attr_vol_alignment);
186 device_remove_file(&vol->dev, &attr_vol_corrupted);
187 device_remove_file(&vol->dev, &attr_vol_name);
188 device_remove_file(&vol->dev, &attr_vol_type);
189 device_remove_file(&vol->dev, &attr_vol_reserved_ebs);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400190 device_unregister(&vol->dev);
191}
192
193/**
194 * ubi_create_volume - create volume.
195 * @ubi: UBI device description object
196 * @req: volume creation request
197 *
198 * This function creates volume described by @req. If @req->vol_id id
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200199 * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400200 * and saves it in @req->vol_id. Returns zero in case of success and a negative
Artem Bityutskiy40e4d0c2007-12-17 17:08:55 +0200201 * error code in case of failure. Note, the caller has to have the
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300202 * @ubi->device_mutex locked.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400203 */
204int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
205{
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300206 int i, err, vol_id = req->vol_id, do_free = 1;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400207 struct ubi_volume *vol;
208 struct ubi_vtbl_record vtbl_rec;
Artem Bityutskiy49dfc292007-12-15 18:13:56 +0200209 dev_t dev;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400210
211 if (ubi->ro_mode)
212 return -EROFS;
213
214 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
215 if (!vol)
216 return -ENOMEM;
217
218 spin_lock(&ubi->volumes_lock);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400219 if (vol_id == UBI_VOL_NUM_AUTO) {
220 /* Find unused volume ID */
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300221 dbg_gen("search for vacant volume ID");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400222 for (i = 0; i < ubi->vtbl_slots; i++)
223 if (!ubi->volumes[i]) {
224 vol_id = i;
225 break;
226 }
227
228 if (vol_id == UBI_VOL_NUM_AUTO) {
229 dbg_err("out of volume IDs");
230 err = -ENFILE;
231 goto out_unlock;
232 }
233 req->vol_id = vol_id;
234 }
235
Artem Bityutskiye1cf7e62009-05-07 18:24:14 +0300236 dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s",
237 ubi->ubi_num, vol_id, (unsigned long long)req->bytes,
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400238 (int)req->vol_type, req->name);
239
240 /* Ensure that this volume does not exist */
241 err = -EEXIST;
242 if (ubi->volumes[vol_id]) {
243 dbg_err("volume %d already exists", vol_id);
244 goto out_unlock;
245 }
246
247 /* Ensure that the name is unique */
248 for (i = 0; i < ubi->vtbl_slots; i++)
249 if (ubi->volumes[i] &&
250 ubi->volumes[i]->name_len == req->name_len &&
Artem Bityutskiy94784d92007-06-18 12:06:30 +0300251 !strcmp(ubi->volumes[i]->name, req->name)) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400252 dbg_err("volume \"%s\" exists (ID %d)", req->name, i);
253 goto out_unlock;
254 }
255
Artem Bityutskiy9c9ec142008-07-18 13:19:52 +0300256 /* Calculate how many eraseblocks are requested */
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400257 vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment;
Artem Bityutskiy3013ee32009-01-16 19:08:43 +0200258 vol->reserved_pebs += div_u64(req->bytes + vol->usable_leb_size - 1,
259 vol->usable_leb_size);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400260
261 /* Reserve physical eraseblocks */
262 if (vol->reserved_pebs > ubi->avail_pebs) {
263 dbg_err("not enough PEBs, only %d available", ubi->avail_pebs);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400264 err = -ENOSPC;
265 goto out_unlock;
266 }
267 ubi->avail_pebs -= vol->reserved_pebs;
268 ubi->rsvd_pebs += vol->reserved_pebs;
Artem Bityutskiye73f4452007-12-17 17:37:26 +0200269 spin_unlock(&ubi->volumes_lock);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400270
271 vol->vol_id = vol_id;
272 vol->alignment = req->alignment;
273 vol->data_pad = ubi->leb_size % vol->alignment;
274 vol->vol_type = req->vol_type;
275 vol->name_len = req->name_len;
Artem Bityutskiya6ea4402008-07-13 21:46:24 +0300276 memcpy(vol->name, req->name, vol->name_len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400277 vol->ubi = ubi;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400278
279 /*
280 * Finish all pending erases because there may be some LEBs belonging
281 * to the same volume ID.
282 */
283 err = ubi_wl_flush(ubi);
284 if (err)
285 goto out_acc;
286
287 vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL);
288 if (!vol->eba_tbl) {
289 err = -ENOMEM;
290 goto out_acc;
291 }
292
293 for (i = 0; i < vol->reserved_pebs; i++)
294 vol->eba_tbl[i] = UBI_LEB_UNMAPPED;
295
296 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
297 vol->used_ebs = vol->reserved_pebs;
298 vol->last_eb_bytes = vol->usable_leb_size;
Vinit Agnihotrid08c3b72007-07-10 13:04:59 +0300299 vol->used_bytes =
300 (long long)vol->used_ebs * vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400301 } else {
Artem Bityutskiy3013ee32009-01-16 19:08:43 +0200302 vol->used_ebs = div_u64_rem(vol->used_bytes,
303 vol->usable_leb_size,
304 &vol->last_eb_bytes);
305 if (vol->last_eb_bytes != 0)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400306 vol->used_ebs += 1;
307 else
308 vol->last_eb_bytes = vol->usable_leb_size;
309 }
310
311 /* Register character device for the volume */
312 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
313 vol->cdev.owner = THIS_MODULE;
Artem Bityutskiy49dfc292007-12-15 18:13:56 +0200314 dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1);
315 err = cdev_add(&vol->cdev, dev, 1);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400316 if (err) {
Artem Bityutskiy01f7b302007-12-15 19:56:51 +0200317 ubi_err("cannot add character device");
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400318 goto out_mapping;
319 }
320
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400321 vol->dev.release = vol_release;
322 vol->dev.parent = &ubi->dev;
Artem Bityutskiy49dfc292007-12-15 18:13:56 +0200323 vol->dev.devt = dev;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400324 vol->dev.class = ubi_class;
Artem Bityutskiyfc75a1e2007-12-17 14:02:09 +0200325
Kay Sievers475b44c2009-01-06 10:44:38 -0800326 dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400327 err = device_register(&vol->dev);
Artem Bityutskiy01f7b302007-12-15 19:56:51 +0200328 if (err) {
329 ubi_err("cannot register device");
Dmitry Pervushin518ceef2009-04-29 19:29:44 +0400330 goto out_cdev;
Artem Bityutskiy01f7b302007-12-15 19:56:51 +0200331 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400332
333 err = volume_sysfs_init(ubi, vol);
334 if (err)
335 goto out_sysfs;
336
337 /* Fill volume table record */
338 memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record));
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300339 vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs);
340 vtbl_rec.alignment = cpu_to_be32(vol->alignment);
341 vtbl_rec.data_pad = cpu_to_be32(vol->data_pad);
342 vtbl_rec.name_len = cpu_to_be16(vol->name_len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400343 if (vol->vol_type == UBI_DYNAMIC_VOLUME)
344 vtbl_rec.vol_type = UBI_VID_DYNAMIC;
345 else
346 vtbl_rec.vol_type = UBI_VID_STATIC;
Artem Bityutskiya6ea4402008-07-13 21:46:24 +0300347 memcpy(vtbl_rec.name, vol->name, vol->name_len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400348
349 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
350 if (err)
351 goto out_sysfs;
352
353 spin_lock(&ubi->volumes_lock);
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200354 ubi->volumes[vol_id] = vol;
Artem Bityutskiy4b3cc342007-12-26 15:59:39 +0200355 ubi->vol_count += 1;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400356 spin_unlock(&ubi->volumes_lock);
357
Dmitry Pervushin0e0ee1c2009-04-29 19:29:38 +0400358 ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
Artem Bityutskiyd38dce52009-05-13 14:05:24 +0300359 if (paranoid_check_volumes(ubi))
360 dbg_err("check failed while creating volume %d", vol_id);
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300361 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400362
Artem Bityutskiyfc75a1e2007-12-17 14:02:09 +0200363out_sysfs:
364 /*
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300365 * We have registered our device, we should not free the volume
Artem Bityutskiyfc75a1e2007-12-17 14:02:09 +0200366 * description object in this function in case of an error - it is
367 * freed by the release function.
368 *
369 * Get device reference to prevent the release function from being
370 * called just after sysfs has been closed.
371 */
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300372 do_free = 0;
Artem Bityutskiyfc75a1e2007-12-17 14:02:09 +0200373 get_device(&vol->dev);
374 volume_sysfs_close(vol);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400375out_cdev:
376 cdev_del(&vol->cdev);
377out_mapping:
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300378 if (do_free)
379 kfree(vol->eba_tbl);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400380out_acc:
381 spin_lock(&ubi->volumes_lock);
382 ubi->rsvd_pebs -= vol->reserved_pebs;
383 ubi->avail_pebs += vol->reserved_pebs;
384out_unlock:
385 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300386 if (do_free)
Artem Bityutskiyfc75a1e2007-12-17 14:02:09 +0200387 kfree(vol);
Artem Bityutskiyabc5e922008-06-04 16:48:12 +0300388 else
389 put_device(&vol->dev);
Artem Bityutskiy01f7b302007-12-15 19:56:51 +0200390 ubi_err("cannot create volume %d, error %d", vol_id, err);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400391 return err;
392}
393
394/**
395 * ubi_remove_volume - remove volume.
396 * @desc: volume descriptor
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300397 * @no_vtbl: do not change volume table if not zero
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400398 *
399 * This function removes volume described by @desc. The volume has to be opened
400 * in "exclusive" mode. Returns zero in case of success and a negative error
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300401 * code in case of failure. The caller has to have the @ubi->device_mutex
Artem Bityutskiy40e4d0c2007-12-17 17:08:55 +0200402 * locked.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400403 */
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300404int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400405{
406 struct ubi_volume *vol = desc->vol;
407 struct ubi_device *ubi = vol->ubi;
408 int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
409
Artem Bityutskiye1cf7e62009-05-07 18:24:14 +0300410 dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400411 ubi_assert(desc->mode == UBI_EXCLUSIVE);
412 ubi_assert(vol == ubi->volumes[vol_id]);
413
414 if (ubi->ro_mode)
415 return -EROFS;
416
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200417 spin_lock(&ubi->volumes_lock);
418 if (vol->ref_count > 1) {
419 /*
420 * The volume is busy, probably someone is reading one of its
421 * sysfs files.
422 */
423 err = -EBUSY;
424 goto out_unlock;
425 }
426 ubi->volumes[vol_id] = NULL;
427 spin_unlock(&ubi->volumes_lock);
428
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300429 if (!no_vtbl) {
430 err = ubi_change_vtbl_record(ubi, vol_id, NULL);
431 if (err)
432 goto out_err;
433 }
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400434
435 for (i = 0; i < vol->reserved_pebs; i++) {
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200436 err = ubi_eba_unmap_leb(ubi, vol, i);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400437 if (err)
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200438 goto out_err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400439 }
440
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400441 cdev_del(&vol->cdev);
442 volume_sysfs_close(vol);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400443
444 spin_lock(&ubi->volumes_lock);
445 ubi->rsvd_pebs -= reserved_pebs;
446 ubi->avail_pebs += reserved_pebs;
447 i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
448 if (i > 0) {
449 i = ubi->avail_pebs >= i ? i : ubi->avail_pebs;
450 ubi->avail_pebs -= i;
451 ubi->rsvd_pebs += i;
452 ubi->beb_rsvd_pebs += i;
453 if (i > 0)
454 ubi_msg("reserve more %d PEBs", i);
455 }
456 ubi->vol_count -= 1;
457 spin_unlock(&ubi->volumes_lock);
458
Dmitry Pervushin0e0ee1c2009-04-29 19:29:38 +0400459 ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED);
Artem Bityutskiyd38dce52009-05-13 14:05:24 +0300460 if (!no_vtbl && paranoid_check_volumes(ubi))
461 dbg_err("check failed while removing volume %d", vol_id);
462
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300463 return err;
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200464
465out_err:
466 ubi_err("cannot remove volume %d, error %d", vol_id, err);
467 spin_lock(&ubi->volumes_lock);
468 ubi->volumes[vol_id] = vol;
469out_unlock:
470 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiycae0a772007-12-17 12:46:48 +0200471 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400472}
473
474/**
475 * ubi_resize_volume - re-size volume.
476 * @desc: volume descriptor
477 * @reserved_pebs: new size in physical eraseblocks
478 *
Artem Bityutskiy40e4d0c2007-12-17 17:08:55 +0200479 * This function re-sizes the volume and returns zero in case of success, and a
480 * negative error code in case of failure. The caller has to have the
Artem Bityutskiyf089c0b2009-05-07 11:46:49 +0300481 * @ubi->device_mutex locked.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400482 */
483int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
484{
485 int i, err, pebs, *new_mapping;
486 struct ubi_volume *vol = desc->vol;
487 struct ubi_device *ubi = vol->ubi;
488 struct ubi_vtbl_record vtbl_rec;
489 int vol_id = vol->vol_id;
490
491 if (ubi->ro_mode)
492 return -EROFS;
493
Artem Bityutskiye1cf7e62009-05-07 18:24:14 +0300494 dbg_gen("re-size device %d, volume %d to from %d to %d PEBs",
495 ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400496
497 if (vol->vol_type == UBI_STATIC_VOLUME &&
498 reserved_pebs < vol->used_ebs) {
499 dbg_err("too small size %d, %d LEBs contain data",
500 reserved_pebs, vol->used_ebs);
501 return -EINVAL;
502 }
503
504 /* If the size is the same, we have nothing to do */
505 if (reserved_pebs == vol->reserved_pebs)
506 return 0;
507
508 new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL);
509 if (!new_mapping)
510 return -ENOMEM;
511
512 for (i = 0; i < reserved_pebs; i++)
513 new_mapping[i] = UBI_LEB_UNMAPPED;
514
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200515 spin_lock(&ubi->volumes_lock);
516 if (vol->ref_count > 1) {
517 spin_unlock(&ubi->volumes_lock);
518 err = -EBUSY;
519 goto out_free;
520 }
521 spin_unlock(&ubi->volumes_lock);
522
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200523 /* Reserve physical eraseblocks */
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400524 pebs = reserved_pebs - vol->reserved_pebs;
525 if (pebs > 0) {
526 spin_lock(&ubi->volumes_lock);
527 if (pebs > ubi->avail_pebs) {
528 dbg_err("not enough PEBs: requested %d, available %d",
529 pebs, ubi->avail_pebs);
530 spin_unlock(&ubi->volumes_lock);
531 err = -ENOSPC;
532 goto out_free;
533 }
534 ubi->avail_pebs -= pebs;
535 ubi->rsvd_pebs += pebs;
536 for (i = 0; i < vol->reserved_pebs; i++)
537 new_mapping[i] = vol->eba_tbl[i];
538 kfree(vol->eba_tbl);
539 vol->eba_tbl = new_mapping;
540 spin_unlock(&ubi->volumes_lock);
541 }
542
543 /* Change volume table record */
544 memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record));
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300545 vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400546 err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
547 if (err)
548 goto out_acc;
549
550 if (pebs < 0) {
551 for (i = 0; i < -pebs; i++) {
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200552 err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400553 if (err)
554 goto out_acc;
555 }
556 spin_lock(&ubi->volumes_lock);
557 ubi->rsvd_pebs += pebs;
558 ubi->avail_pebs -= pebs;
559 pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
560 if (pebs > 0) {
561 pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs;
562 ubi->avail_pebs -= pebs;
563 ubi->rsvd_pebs += pebs;
564 ubi->beb_rsvd_pebs += pebs;
565 if (pebs > 0)
566 ubi_msg("reserve more %d PEBs", pebs);
567 }
568 for (i = 0; i < reserved_pebs; i++)
569 new_mapping[i] = vol->eba_tbl[i];
570 kfree(vol->eba_tbl);
571 vol->eba_tbl = new_mapping;
572 spin_unlock(&ubi->volumes_lock);
573 }
574
575 vol->reserved_pebs = reserved_pebs;
576 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
577 vol->used_ebs = reserved_pebs;
578 vol->last_eb_bytes = vol->usable_leb_size;
Vinit Agnihotrid08c3b72007-07-10 13:04:59 +0300579 vol->used_bytes =
580 (long long)vol->used_ebs * vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400581 }
582
Dmitry Pervushin0e0ee1c2009-04-29 19:29:38 +0400583 ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED);
Artem Bityutskiyd38dce52009-05-13 14:05:24 +0300584 if (paranoid_check_volumes(ubi))
585 dbg_err("check failed while re-sizing volume %d", vol_id);
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300586 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400587
588out_acc:
589 if (pebs > 0) {
590 spin_lock(&ubi->volumes_lock);
591 ubi->rsvd_pebs -= pebs;
592 ubi->avail_pebs += pebs;
593 spin_unlock(&ubi->volumes_lock);
594 }
595out_free:
596 kfree(new_mapping);
597 return err;
598}
599
600/**
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300601 * ubi_rename_volumes - re-name UBI volumes.
602 * @ubi: UBI device description object
Artem Bityutskiyebaaf1a2008-07-18 13:34:32 +0300603 * @rename_list: list of &struct ubi_rename_entry objects
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300604 *
605 * This function re-names or removes volumes specified in the re-name list.
606 * Returns zero in case of success and a negative error code in case of
607 * failure.
608 */
609int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
610{
611 int err;
612 struct ubi_rename_entry *re;
613
614 err = ubi_vtbl_rename_volumes(ubi, rename_list);
615 if (err)
616 return err;
617
618 list_for_each_entry(re, rename_list, list) {
619 if (re->remove) {
620 err = ubi_remove_volume(re->desc, 1);
621 if (err)
622 break;
623 } else {
624 struct ubi_volume *vol = re->desc->vol;
625
626 spin_lock(&ubi->volumes_lock);
627 vol->name_len = re->new_name_len;
628 memcpy(vol->name, re->new_name, re->new_name_len + 1);
629 spin_unlock(&ubi->volumes_lock);
Dmitry Pervushin0e0ee1c2009-04-29 19:29:38 +0400630 ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300631 }
632 }
633
Artem Bityutskiyd38dce52009-05-13 14:05:24 +0300634 if (!err && paranoid_check_volumes(ubi))
635 ;
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300636 return err;
637}
638
639/**
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400640 * ubi_add_volume - add volume.
641 * @ubi: UBI device description object
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200642 * @vol: volume description object
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400643 *
Artem Bityutskiyd05c77a2007-12-17 15:42:57 +0200644 * This function adds an existing volume and initializes all its data
645 * structures. Returns zero in case of success and a negative error code in
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400646 * case of failure.
647 */
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200648int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400649{
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200650 int err, vol_id = vol->vol_id;
Artem Bityutskiy49dfc292007-12-15 18:13:56 +0200651 dev_t dev;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400652
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300653 dbg_gen("add volume %d", vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400654
655 /* Register character device for the volume */
656 cdev_init(&vol->cdev, &ubi_vol_cdev_operations);
657 vol->cdev.owner = THIS_MODULE;
Artem Bityutskiy49dfc292007-12-15 18:13:56 +0200658 dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1);
659 err = cdev_add(&vol->cdev, dev, 1);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400660 if (err) {
Artem Bityutskiy01f7b302007-12-15 19:56:51 +0200661 ubi_err("cannot add character device for volume %d, error %d",
662 vol_id, err);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400663 return err;
664 }
665
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400666 vol->dev.release = vol_release;
667 vol->dev.parent = &ubi->dev;
Artem Bityutskiy49dfc292007-12-15 18:13:56 +0200668 vol->dev.devt = dev;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400669 vol->dev.class = ubi_class;
Kay Sievers475b44c2009-01-06 10:44:38 -0800670 dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400671 err = device_register(&vol->dev);
672 if (err)
Dmitry Pervushin518ceef2009-04-29 19:29:44 +0400673 goto out_cdev;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400674
675 err = volume_sysfs_init(ubi, vol);
676 if (err) {
677 cdev_del(&vol->cdev);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400678 volume_sysfs_close(vol);
679 return err;
680 }
681
Artem Bityutskiyd38dce52009-05-13 14:05:24 +0300682 if (paranoid_check_volumes(ubi))
683 dbg_err("check failed while adding volume %d", vol_id);
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300684 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400685
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400686out_cdev:
687 cdev_del(&vol->cdev);
688 return err;
689}
690
691/**
692 * ubi_free_volume - free volume.
693 * @ubi: UBI device description object
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200694 * @vol: volume description object
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400695 *
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200696 * This function frees all resources for volume @vol but does not remove it.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400697 * Used only when the UBI device is detached.
698 */
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200699void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400700{
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300701 dbg_gen("free volume %d", vol->vol_id);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400702
Artem Bityutskiy89b96b62007-12-16 20:00:38 +0200703 ubi->volumes[vol->vol_id] = NULL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400704 cdev_del(&vol->cdev);
705 volume_sysfs_close(vol);
706}
707
708#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
709
710/**
711 * paranoid_check_volume - check volume information.
712 * @ubi: UBI device description object
713 * @vol_id: volume ID
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300714 *
715 * Returns zero if volume is all right and a a negative error code if not.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400716 */
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300717static int paranoid_check_volume(struct ubi_device *ubi, int vol_id)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400718{
719 int idx = vol_id2idx(ubi, vol_id);
720 int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker;
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300721 const struct ubi_volume *vol;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400722 long long n;
723 const char *name;
724
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300725 spin_lock(&ubi->volumes_lock);
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300726 reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs);
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300727 vol = ubi->volumes[idx];
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400728
729 if (!vol) {
730 if (reserved_pebs) {
731 ubi_err("no volume info, but volume exists");
732 goto fail;
733 }
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300734 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300735 return 0;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400736 }
737
738 if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 ||
739 vol->name_len < 0) {
740 ubi_err("negative values");
741 goto fail;
742 }
743 if (vol->alignment > ubi->leb_size || vol->alignment == 0) {
744 ubi_err("bad alignment");
745 goto fail;
746 }
747
Kyungmin Parkcadb40c2008-05-22 10:32:18 +0900748 n = vol->alignment & (ubi->min_io_size - 1);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400749 if (vol->alignment != 1 && n) {
750 ubi_err("alignment is not multiple of min I/O unit");
751 goto fail;
752 }
753
754 n = ubi->leb_size % vol->alignment;
755 if (vol->data_pad != n) {
756 ubi_err("bad data_pad, has to be %lld", n);
757 goto fail;
758 }
759
760 if (vol->vol_type != UBI_DYNAMIC_VOLUME &&
761 vol->vol_type != UBI_STATIC_VOLUME) {
762 ubi_err("bad vol_type");
763 goto fail;
764 }
765
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400766 if (vol->upd_marker && vol->corrupted) {
767 dbg_err("update marker and corrupted simultaneously");
768 goto fail;
769 }
770
771 if (vol->reserved_pebs > ubi->good_peb_count) {
772 ubi_err("too large reserved_pebs");
773 goto fail;
774 }
775
776 n = ubi->leb_size - vol->data_pad;
777 if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) {
778 ubi_err("bad usable_leb_size, has to be %lld", n);
779 goto fail;
780 }
781
782 if (vol->name_len > UBI_VOL_NAME_MAX) {
783 ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX);
784 goto fail;
785 }
786
787 if (!vol->name) {
788 ubi_err("NULL volume name");
789 goto fail;
790 }
791
792 n = strnlen(vol->name, vol->name_len + 1);
793 if (n != vol->name_len) {
794 ubi_err("bad name_len %lld", n);
795 goto fail;
796 }
797
Vinit Agnihotrid08c3b72007-07-10 13:04:59 +0300798 n = (long long)vol->used_ebs * vol->usable_leb_size;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400799 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
Artem Bityutskiy896c0c02008-01-16 14:24:14 +0200800 if (vol->corrupted) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400801 ubi_err("corrupted dynamic volume");
802 goto fail;
803 }
804 if (vol->used_ebs != vol->reserved_pebs) {
805 ubi_err("bad used_ebs");
806 goto fail;
807 }
808 if (vol->last_eb_bytes != vol->usable_leb_size) {
809 ubi_err("bad last_eb_bytes");
810 goto fail;
811 }
812 if (vol->used_bytes != n) {
813 ubi_err("bad used_bytes");
814 goto fail;
815 }
816 } else {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400817 if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
818 ubi_err("bad used_ebs");
819 goto fail;
820 }
821 if (vol->last_eb_bytes < 0 ||
822 vol->last_eb_bytes > vol->usable_leb_size) {
823 ubi_err("bad last_eb_bytes");
824 goto fail;
825 }
826 if (vol->used_bytes < 0 || vol->used_bytes > n ||
827 vol->used_bytes < n - vol->usable_leb_size) {
828 ubi_err("bad used_bytes");
829 goto fail;
830 }
831 }
832
Christoph Hellwig3261ebd2007-05-21 17:41:46 +0300833 alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment);
834 data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad);
835 name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400836 upd_marker = ubi->vtbl[vol_id].upd_marker;
837 name = &ubi->vtbl[vol_id].name[0];
838 if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC)
839 vol_type = UBI_DYNAMIC_VOLUME;
840 else
841 vol_type = UBI_STATIC_VOLUME;
842
843 if (alignment != vol->alignment || data_pad != vol->data_pad ||
844 upd_marker != vol->upd_marker || vol_type != vol->vol_type ||
Artem Bityutskiy9c9ec142008-07-18 13:19:52 +0300845 name_len != vol->name_len || strncmp(name, vol->name, name_len)) {
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400846 ubi_err("volume info is different");
847 goto fail;
848 }
849
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300850 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300851 return 0;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400852
853fail:
Artem Bityutskiy94784d92007-06-18 12:06:30 +0300854 ubi_err("paranoid check failed for volume %d", vol_id);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300855 if (vol)
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300856 ubi_dbg_dump_vol_info(vol);
Artem Bityutskiyf40ac9c2008-07-13 21:47:47 +0300857 ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
Artem Bityutskiycfcf0ec2009-05-12 20:29:15 +0300858 dump_stack();
Artem Bityutskiyb89044b2007-06-18 16:29:30 +0300859 spin_unlock(&ubi->volumes_lock);
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300860 return -EINVAL;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400861}
862
863/**
864 * paranoid_check_volumes - check information about all volumes.
865 * @ubi: UBI device description object
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300866 *
867 * Returns zero if volumes are all right and a a negative error code if not.
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400868 */
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300869static int paranoid_check_volumes(struct ubi_device *ubi)
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400870{
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300871 int i, err = 0;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400872
Artem Bityutskiyc8566352008-07-16 17:40:22 +0300873 for (i = 0; i < ubi->vtbl_slots; i++) {
874 err = paranoid_check_volume(ubi, i);
875 if (err)
876 break;
877 }
878
879 return err;
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400880}
881#endif