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Commit | Line | Data |
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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> | |
3013ee31 | 27 | #include <linux/math64.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
801c135c AB |
29 | #include "ubi.h" |
30 | ||
92d124f5 | 31 | #ifdef CONFIG_MTD_UBI_DEBUG |
c8566350 | 32 | static int paranoid_check_volumes(struct ubi_device *ubi); |
801c135c | 33 | #else |
c8566350 | 34 | #define paranoid_check_volumes(ubi) 0 |
801c135c AB |
35 | #endif |
36 | ||
37 | static 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' */ | |
8bc22961 | 41 | static struct device_attribute attr_vol_reserved_ebs = |
801c135c | 42 | __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 43 | static struct device_attribute attr_vol_type = |
801c135c | 44 | __ATTR(type, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 45 | static struct device_attribute attr_vol_name = |
801c135c | 46 | __ATTR(name, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 47 | static struct device_attribute attr_vol_corrupted = |
801c135c | 48 | __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 49 | static struct device_attribute attr_vol_alignment = |
801c135c | 50 | __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 51 | static struct device_attribute attr_vol_usable_eb_size = |
801c135c | 52 | __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 53 | static struct device_attribute attr_vol_data_bytes = |
801c135c | 54 | __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 55 | static struct device_attribute attr_vol_upd_marker = |
801c135c AB |
56 | __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 | * | |
d05c77a8 AB |
67 | * In this situation, this function will return %-ENODEV because it will find |
68 | * out that the volume was removed from the @ubi->volumes array. | |
801c135c AB |
69 | */ |
70 | static ssize_t vol_attribute_show(struct device *dev, | |
71 | struct device_attribute *attr, char *buf) | |
72 | { | |
d05c77a8 | 73 | int ret; |
801c135c | 74 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
e73f4459 AB |
75 | struct ubi_device *ubi; |
76 | ||
77 | ubi = ubi_get_device(vol->ubi->ubi_num); | |
78 | if (!ubi) | |
79 | return -ENODEV; | |
801c135c | 80 | |
d05c77a8 AB |
81 | spin_lock(&ubi->volumes_lock); |
82 | if (!ubi->volumes[vol->vol_id]) { | |
83 | spin_unlock(&ubi->volumes_lock); | |
e73f4459 | 84 | ubi_put_device(ubi); |
d05c77a8 | 85 | return -ENODEV; |
801c135c | 86 | } |
d05c77a8 AB |
87 | /* Take a reference to prevent volume removal */ |
88 | vol->ref_count += 1; | |
89 | spin_unlock(&ubi->volumes_lock); | |
732aeacf | 90 | |
8bc22961 | 91 | if (attr == &attr_vol_reserved_ebs) |
801c135c | 92 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); |
8bc22961 | 93 | else if (attr == &attr_vol_type) { |
801c135c | 94 | const char *tp; |
8bc22961 AB |
95 | |
96 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
97 | tp = "dynamic"; | |
98 | else | |
99 | tp = "static"; | |
801c135c | 100 | ret = sprintf(buf, "%s\n", tp); |
8bc22961 | 101 | } else if (attr == &attr_vol_name) |
801c135c | 102 | ret = sprintf(buf, "%s\n", vol->name); |
8bc22961 | 103 | else if (attr == &attr_vol_corrupted) |
801c135c | 104 | ret = sprintf(buf, "%d\n", vol->corrupted); |
8bc22961 | 105 | else if (attr == &attr_vol_alignment) |
801c135c | 106 | ret = sprintf(buf, "%d\n", vol->alignment); |
732aeacf | 107 | else if (attr == &attr_vol_usable_eb_size) |
801c135c | 108 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); |
732aeacf | 109 | else if (attr == &attr_vol_data_bytes) |
801c135c | 110 | ret = sprintf(buf, "%lld\n", vol->used_bytes); |
8bc22961 | 111 | else if (attr == &attr_vol_upd_marker) |
801c135c AB |
112 | ret = sprintf(buf, "%d\n", vol->upd_marker); |
113 | else | |
d05c77a8 AB |
114 | /* This must be a bug */ |
115 | ret = -EINVAL; | |
116 | ||
e73f4459 | 117 | /* We've done the operation, drop volume and UBI device references */ |
d05c77a8 AB |
118 | spin_lock(&ubi->volumes_lock); |
119 | vol->ref_count -= 1; | |
120 | ubi_assert(vol->ref_count >= 0); | |
121 | spin_unlock(&ubi->volumes_lock); | |
e73f4459 | 122 | ubi_put_device(ubi); |
801c135c AB |
123 | return ret; |
124 | } | |
125 | ||
126 | /* Release method for volume devices */ | |
127 | static void vol_release(struct device *dev) | |
128 | { | |
129 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); | |
732aeacf | 130 | |
abc5e922 | 131 | kfree(vol->eba_tbl); |
801c135c AB |
132 | 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 | */ | |
147 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) | |
148 | { | |
149 | int err; | |
150 | ||
8bc22961 | 151 | err = device_create_file(&vol->dev, &attr_vol_reserved_ebs); |
801c135c AB |
152 | if (err) |
153 | return err; | |
8bc22961 | 154 | err = device_create_file(&vol->dev, &attr_vol_type); |
801c135c AB |
155 | if (err) |
156 | return err; | |
8bc22961 | 157 | err = device_create_file(&vol->dev, &attr_vol_name); |
801c135c AB |
158 | if (err) |
159 | return err; | |
8bc22961 | 160 | err = device_create_file(&vol->dev, &attr_vol_corrupted); |
801c135c AB |
161 | if (err) |
162 | return err; | |
8bc22961 | 163 | err = device_create_file(&vol->dev, &attr_vol_alignment); |
801c135c AB |
164 | if (err) |
165 | return err; | |
8bc22961 | 166 | err = device_create_file(&vol->dev, &attr_vol_usable_eb_size); |
801c135c AB |
167 | if (err) |
168 | return err; | |
8bc22961 | 169 | err = device_create_file(&vol->dev, &attr_vol_data_bytes); |
801c135c AB |
170 | if (err) |
171 | return err; | |
8bc22961 | 172 | err = device_create_file(&vol->dev, &attr_vol_upd_marker); |
fc75a1e1 | 173 | return err; |
801c135c AB |
174 | } |
175 | ||
176 | /** | |
177 | * volume_sysfs_close - close sysfs for a volume. | |
178 | * @vol: volume description object | |
179 | */ | |
180 | static void volume_sysfs_close(struct ubi_volume *vol) | |
181 | { | |
8bc22961 AB |
182 | 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); | |
801c135c AB |
190 | 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 | |
d05c77a8 | 199 | * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume |
801c135c | 200 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
40e4d0c1 | 201 | * error code in case of failure. Note, the caller has to have the |
f089c0b2 | 202 | * @ubi->device_mutex locked. |
801c135c AB |
203 | */ |
204 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
205 | { | |
abc5e922 | 206 | int i, err, vol_id = req->vol_id, do_free = 1; |
801c135c AB |
207 | struct ubi_volume *vol; |
208 | struct ubi_vtbl_record vtbl_rec; | |
49dfc299 | 209 | dev_t dev; |
801c135c AB |
210 | |
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); | |
801c135c AB |
219 | if (vol_id == UBI_VOL_NUM_AUTO) { |
220 | /* Find unused volume ID */ | |
c8566350 | 221 | dbg_gen("search for vacant volume ID"); |
801c135c AB |
222 | 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 | ||
e1cf7e6d AB |
236 | dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s", |
237 | ubi->ubi_num, vol_id, (unsigned long long)req->bytes, | |
801c135c AB |
238 | (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 && | |
94784d91 | 251 | !strcmp(ubi->volumes[i]->name, req->name)) { |
801c135c AB |
252 | dbg_err("volume \"%s\" exists (ID %d)", req->name, i); |
253 | goto out_unlock; | |
254 | } | |
255 | ||
9c9ec147 | 256 | /* Calculate how many eraseblocks are requested */ |
801c135c | 257 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; |
3013ee31 AB |
258 | vol->reserved_pebs += div_u64(req->bytes + vol->usable_leb_size - 1, |
259 | vol->usable_leb_size); | |
801c135c AB |
260 | |
261 | /* Reserve physical eraseblocks */ | |
262 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
263 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); | |
5fc01ab6 AB |
264 | if (ubi->corr_peb_count) |
265 | dbg_err("%d PEBs are corrupted and not used", | |
266 | ubi->corr_peb_count); | |
801c135c AB |
267 | err = -ENOSPC; |
268 | goto out_unlock; | |
269 | } | |
270 | ubi->avail_pebs -= vol->reserved_pebs; | |
271 | ubi->rsvd_pebs += vol->reserved_pebs; | |
e73f4459 | 272 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
273 | |
274 | vol->vol_id = vol_id; | |
275 | vol->alignment = req->alignment; | |
276 | vol->data_pad = ubi->leb_size % vol->alignment; | |
277 | vol->vol_type = req->vol_type; | |
278 | vol->name_len = req->name_len; | |
a6ea4407 | 279 | memcpy(vol->name, req->name, vol->name_len); |
801c135c | 280 | vol->ubi = ubi; |
801c135c AB |
281 | |
282 | /* | |
283 | * Finish all pending erases because there may be some LEBs belonging | |
284 | * to the same volume ID. | |
285 | */ | |
286 | err = ubi_wl_flush(ubi); | |
287 | if (err) | |
288 | goto out_acc; | |
289 | ||
290 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
291 | if (!vol->eba_tbl) { | |
292 | err = -ENOMEM; | |
293 | goto out_acc; | |
294 | } | |
295 | ||
296 | for (i = 0; i < vol->reserved_pebs; i++) | |
297 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
298 | ||
299 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
300 | vol->used_ebs = vol->reserved_pebs; | |
301 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
302 | vol->used_bytes = |
303 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c | 304 | } else { |
3013ee31 AB |
305 | vol->used_ebs = div_u64_rem(vol->used_bytes, |
306 | vol->usable_leb_size, | |
307 | &vol->last_eb_bytes); | |
308 | if (vol->last_eb_bytes != 0) | |
801c135c AB |
309 | vol->used_ebs += 1; |
310 | else | |
311 | vol->last_eb_bytes = vol->usable_leb_size; | |
312 | } | |
313 | ||
314 | /* Register character device for the volume */ | |
315 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
316 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
317 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
318 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 319 | if (err) { |
01f7b309 | 320 | ubi_err("cannot add character device"); |
801c135c AB |
321 | goto out_mapping; |
322 | } | |
323 | ||
801c135c AB |
324 | vol->dev.release = vol_release; |
325 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 326 | vol->dev.devt = dev; |
801c135c | 327 | vol->dev.class = ubi_class; |
fc75a1e1 | 328 | |
475b44c1 | 329 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c | 330 | err = device_register(&vol->dev); |
01f7b309 AB |
331 | if (err) { |
332 | ubi_err("cannot register device"); | |
518ceef0 | 333 | goto out_cdev; |
01f7b309 | 334 | } |
801c135c AB |
335 | |
336 | err = volume_sysfs_init(ubi, vol); | |
337 | if (err) | |
338 | goto out_sysfs; | |
339 | ||
340 | /* Fill volume table record */ | |
341 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
3261ebd7 CH |
342 | vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); |
343 | vtbl_rec.alignment = cpu_to_be32(vol->alignment); | |
344 | vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); | |
345 | vtbl_rec.name_len = cpu_to_be16(vol->name_len); | |
801c135c AB |
346 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
347 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
348 | else | |
349 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
a6ea4407 | 350 | memcpy(vtbl_rec.name, vol->name, vol->name_len); |
801c135c AB |
351 | |
352 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
353 | if (err) | |
354 | goto out_sysfs; | |
355 | ||
356 | spin_lock(&ubi->volumes_lock); | |
d05c77a8 | 357 | ubi->volumes[vol_id] = vol; |
4b3cc340 | 358 | ubi->vol_count += 1; |
801c135c AB |
359 | spin_unlock(&ubi->volumes_lock); |
360 | ||
0e0ee1cc | 361 | ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED); |
d38dce5b AB |
362 | if (paranoid_check_volumes(ubi)) |
363 | dbg_err("check failed while creating volume %d", vol_id); | |
c8566350 | 364 | return err; |
801c135c | 365 | |
fc75a1e1 AB |
366 | out_sysfs: |
367 | /* | |
abc5e922 | 368 | * We have registered our device, we should not free the volume |
fc75a1e1 AB |
369 | * description object in this function in case of an error - it is |
370 | * freed by the release function. | |
371 | * | |
372 | * Get device reference to prevent the release function from being | |
373 | * called just after sysfs has been closed. | |
374 | */ | |
abc5e922 | 375 | do_free = 0; |
fc75a1e1 AB |
376 | get_device(&vol->dev); |
377 | volume_sysfs_close(vol); | |
801c135c AB |
378 | out_cdev: |
379 | cdev_del(&vol->cdev); | |
380 | out_mapping: | |
abc5e922 AB |
381 | if (do_free) |
382 | kfree(vol->eba_tbl); | |
801c135c AB |
383 | out_acc: |
384 | spin_lock(&ubi->volumes_lock); | |
385 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
386 | ubi->avail_pebs += vol->reserved_pebs; | |
387 | out_unlock: | |
388 | spin_unlock(&ubi->volumes_lock); | |
abc5e922 | 389 | if (do_free) |
fc75a1e1 | 390 | kfree(vol); |
abc5e922 AB |
391 | else |
392 | put_device(&vol->dev); | |
01f7b309 | 393 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
394 | return err; |
395 | } | |
396 | ||
397 | /** | |
398 | * ubi_remove_volume - remove volume. | |
399 | * @desc: volume descriptor | |
f40ac9cd | 400 | * @no_vtbl: do not change volume table if not zero |
801c135c AB |
401 | * |
402 | * This function removes volume described by @desc. The volume has to be opened | |
403 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
f089c0b2 | 404 | * code in case of failure. The caller has to have the @ubi->device_mutex |
40e4d0c1 | 405 | * locked. |
801c135c | 406 | */ |
f40ac9cd | 407 | int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) |
801c135c AB |
408 | { |
409 | struct ubi_volume *vol = desc->vol; | |
410 | struct ubi_device *ubi = vol->ubi; | |
411 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
412 | ||
e1cf7e6d | 413 | dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id); |
801c135c AB |
414 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
415 | ubi_assert(vol == ubi->volumes[vol_id]); | |
416 | ||
417 | if (ubi->ro_mode) | |
418 | return -EROFS; | |
419 | ||
d05c77a8 AB |
420 | spin_lock(&ubi->volumes_lock); |
421 | if (vol->ref_count > 1) { | |
422 | /* | |
423 | * The volume is busy, probably someone is reading one of its | |
424 | * sysfs files. | |
425 | */ | |
426 | err = -EBUSY; | |
427 | goto out_unlock; | |
428 | } | |
429 | ubi->volumes[vol_id] = NULL; | |
430 | spin_unlock(&ubi->volumes_lock); | |
431 | ||
f40ac9cd AB |
432 | if (!no_vtbl) { |
433 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
434 | if (err) | |
435 | goto out_err; | |
436 | } | |
801c135c AB |
437 | |
438 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 439 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 440 | if (err) |
d05c77a8 | 441 | goto out_err; |
801c135c AB |
442 | } |
443 | ||
801c135c AB |
444 | cdev_del(&vol->cdev); |
445 | volume_sysfs_close(vol); | |
801c135c AB |
446 | |
447 | spin_lock(&ubi->volumes_lock); | |
448 | ubi->rsvd_pebs -= reserved_pebs; | |
449 | ubi->avail_pebs += reserved_pebs; | |
450 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
451 | if (i > 0) { | |
452 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; | |
453 | ubi->avail_pebs -= i; | |
454 | ubi->rsvd_pebs += i; | |
455 | ubi->beb_rsvd_pebs += i; | |
456 | if (i > 0) | |
457 | ubi_msg("reserve more %d PEBs", i); | |
458 | } | |
459 | ubi->vol_count -= 1; | |
460 | spin_unlock(&ubi->volumes_lock); | |
461 | ||
0e0ee1cc | 462 | ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED); |
d38dce5b AB |
463 | if (!no_vtbl && paranoid_check_volumes(ubi)) |
464 | dbg_err("check failed while removing volume %d", vol_id); | |
465 | ||
c8566350 | 466 | return err; |
d05c77a8 AB |
467 | |
468 | out_err: | |
469 | ubi_err("cannot remove volume %d, error %d", vol_id, err); | |
470 | spin_lock(&ubi->volumes_lock); | |
471 | ubi->volumes[vol_id] = vol; | |
472 | out_unlock: | |
473 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 474 | return err; |
801c135c AB |
475 | } |
476 | ||
477 | /** | |
478 | * ubi_resize_volume - re-size volume. | |
479 | * @desc: volume descriptor | |
480 | * @reserved_pebs: new size in physical eraseblocks | |
481 | * | |
40e4d0c1 AB |
482 | * This function re-sizes the volume and returns zero in case of success, and a |
483 | * negative error code in case of failure. The caller has to have the | |
f089c0b2 | 484 | * @ubi->device_mutex locked. |
801c135c AB |
485 | */ |
486 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
487 | { | |
488 | int i, err, pebs, *new_mapping; | |
489 | struct ubi_volume *vol = desc->vol; | |
490 | struct ubi_device *ubi = vol->ubi; | |
491 | struct ubi_vtbl_record vtbl_rec; | |
492 | int vol_id = vol->vol_id; | |
493 | ||
494 | if (ubi->ro_mode) | |
495 | return -EROFS; | |
496 | ||
e1cf7e6d AB |
497 | dbg_gen("re-size device %d, volume %d to from %d to %d PEBs", |
498 | ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs); | |
801c135c AB |
499 | |
500 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
501 | reserved_pebs < vol->used_ebs) { | |
502 | dbg_err("too small size %d, %d LEBs contain data", | |
503 | reserved_pebs, vol->used_ebs); | |
504 | return -EINVAL; | |
505 | } | |
506 | ||
507 | /* If the size is the same, we have nothing to do */ | |
508 | if (reserved_pebs == vol->reserved_pebs) | |
509 | return 0; | |
510 | ||
511 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
512 | if (!new_mapping) | |
513 | return -ENOMEM; | |
514 | ||
515 | for (i = 0; i < reserved_pebs; i++) | |
516 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
517 | ||
d05c77a8 AB |
518 | spin_lock(&ubi->volumes_lock); |
519 | if (vol->ref_count > 1) { | |
520 | spin_unlock(&ubi->volumes_lock); | |
521 | err = -EBUSY; | |
522 | goto out_free; | |
523 | } | |
524 | spin_unlock(&ubi->volumes_lock); | |
525 | ||
d05c77a8 | 526 | /* Reserve physical eraseblocks */ |
801c135c AB |
527 | pebs = reserved_pebs - vol->reserved_pebs; |
528 | if (pebs > 0) { | |
529 | spin_lock(&ubi->volumes_lock); | |
530 | if (pebs > ubi->avail_pebs) { | |
531 | dbg_err("not enough PEBs: requested %d, available %d", | |
532 | pebs, ubi->avail_pebs); | |
5fc01ab6 AB |
533 | if (ubi->corr_peb_count) |
534 | dbg_err("%d PEBs are corrupted and not used", | |
535 | ubi->corr_peb_count); | |
801c135c AB |
536 | spin_unlock(&ubi->volumes_lock); |
537 | err = -ENOSPC; | |
538 | goto out_free; | |
539 | } | |
540 | ubi->avail_pebs -= pebs; | |
541 | ubi->rsvd_pebs += pebs; | |
542 | for (i = 0; i < vol->reserved_pebs; i++) | |
543 | new_mapping[i] = vol->eba_tbl[i]; | |
544 | kfree(vol->eba_tbl); | |
545 | vol->eba_tbl = new_mapping; | |
546 | spin_unlock(&ubi->volumes_lock); | |
547 | } | |
548 | ||
549 | /* Change volume table record */ | |
550 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); | |
3261ebd7 | 551 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); |
801c135c AB |
552 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
553 | if (err) | |
554 | goto out_acc; | |
555 | ||
556 | if (pebs < 0) { | |
557 | for (i = 0; i < -pebs; i++) { | |
89b96b69 | 558 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
559 | if (err) |
560 | goto out_acc; | |
561 | } | |
562 | spin_lock(&ubi->volumes_lock); | |
563 | ubi->rsvd_pebs += pebs; | |
564 | ubi->avail_pebs -= pebs; | |
565 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
566 | if (pebs > 0) { | |
567 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; | |
568 | ubi->avail_pebs -= pebs; | |
569 | ubi->rsvd_pebs += pebs; | |
570 | ubi->beb_rsvd_pebs += pebs; | |
571 | if (pebs > 0) | |
572 | ubi_msg("reserve more %d PEBs", pebs); | |
573 | } | |
574 | for (i = 0; i < reserved_pebs; i++) | |
575 | new_mapping[i] = vol->eba_tbl[i]; | |
576 | kfree(vol->eba_tbl); | |
577 | vol->eba_tbl = new_mapping; | |
578 | spin_unlock(&ubi->volumes_lock); | |
579 | } | |
580 | ||
581 | vol->reserved_pebs = reserved_pebs; | |
582 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
583 | vol->used_ebs = reserved_pebs; | |
584 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
585 | vol->used_bytes = |
586 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
587 | } |
588 | ||
0e0ee1cc | 589 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED); |
d38dce5b AB |
590 | if (paranoid_check_volumes(ubi)) |
591 | dbg_err("check failed while re-sizing volume %d", vol_id); | |
c8566350 | 592 | return err; |
801c135c AB |
593 | |
594 | out_acc: | |
595 | if (pebs > 0) { | |
596 | spin_lock(&ubi->volumes_lock); | |
597 | ubi->rsvd_pebs -= pebs; | |
598 | ubi->avail_pebs += pebs; | |
599 | spin_unlock(&ubi->volumes_lock); | |
600 | } | |
601 | out_free: | |
602 | kfree(new_mapping); | |
603 | return err; | |
604 | } | |
605 | ||
f40ac9cd AB |
606 | /** |
607 | * ubi_rename_volumes - re-name UBI volumes. | |
608 | * @ubi: UBI device description object | |
ebaaf1af | 609 | * @rename_list: list of &struct ubi_rename_entry objects |
f40ac9cd AB |
610 | * |
611 | * This function re-names or removes volumes specified in the re-name list. | |
612 | * Returns zero in case of success and a negative error code in case of | |
613 | * failure. | |
614 | */ | |
615 | int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) | |
616 | { | |
617 | int err; | |
618 | struct ubi_rename_entry *re; | |
619 | ||
620 | err = ubi_vtbl_rename_volumes(ubi, rename_list); | |
621 | if (err) | |
622 | return err; | |
623 | ||
624 | list_for_each_entry(re, rename_list, list) { | |
625 | if (re->remove) { | |
626 | err = ubi_remove_volume(re->desc, 1); | |
627 | if (err) | |
628 | break; | |
629 | } else { | |
630 | struct ubi_volume *vol = re->desc->vol; | |
631 | ||
632 | spin_lock(&ubi->volumes_lock); | |
633 | vol->name_len = re->new_name_len; | |
634 | memcpy(vol->name, re->new_name, re->new_name_len + 1); | |
635 | spin_unlock(&ubi->volumes_lock); | |
0e0ee1cc | 636 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED); |
f40ac9cd AB |
637 | } |
638 | } | |
639 | ||
d38dce5b AB |
640 | if (!err && paranoid_check_volumes(ubi)) |
641 | ; | |
f40ac9cd AB |
642 | return err; |
643 | } | |
644 | ||
801c135c AB |
645 | /** |
646 | * ubi_add_volume - add volume. | |
647 | * @ubi: UBI device description object | |
89b96b69 | 648 | * @vol: volume description object |
801c135c | 649 | * |
d05c77a8 AB |
650 | * This function adds an existing volume and initializes all its data |
651 | * structures. Returns zero in case of success and a negative error code in | |
801c135c AB |
652 | * case of failure. |
653 | */ | |
89b96b69 | 654 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 655 | { |
89b96b69 | 656 | int err, vol_id = vol->vol_id; |
49dfc299 | 657 | dev_t dev; |
801c135c | 658 | |
c8566350 | 659 | dbg_gen("add volume %d", vol_id); |
801c135c AB |
660 | |
661 | /* Register character device for the volume */ | |
662 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
663 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
664 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
665 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 666 | if (err) { |
01f7b309 AB |
667 | ubi_err("cannot add character device for volume %d, error %d", |
668 | vol_id, err); | |
801c135c AB |
669 | return err; |
670 | } | |
671 | ||
801c135c AB |
672 | vol->dev.release = vol_release; |
673 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 674 | vol->dev.devt = dev; |
801c135c | 675 | vol->dev.class = ubi_class; |
475b44c1 | 676 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c AB |
677 | err = device_register(&vol->dev); |
678 | if (err) | |
518ceef0 | 679 | goto out_cdev; |
801c135c AB |
680 | |
681 | err = volume_sysfs_init(ubi, vol); | |
682 | if (err) { | |
683 | cdev_del(&vol->cdev); | |
801c135c AB |
684 | volume_sysfs_close(vol); |
685 | return err; | |
686 | } | |
687 | ||
d38dce5b AB |
688 | if (paranoid_check_volumes(ubi)) |
689 | dbg_err("check failed while adding volume %d", vol_id); | |
c8566350 | 690 | return err; |
801c135c | 691 | |
801c135c AB |
692 | out_cdev: |
693 | cdev_del(&vol->cdev); | |
694 | return err; | |
695 | } | |
696 | ||
697 | /** | |
698 | * ubi_free_volume - free volume. | |
699 | * @ubi: UBI device description object | |
89b96b69 | 700 | * @vol: volume description object |
801c135c | 701 | * |
89b96b69 | 702 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
703 | * Used only when the UBI device is detached. |
704 | */ | |
89b96b69 | 705 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 706 | { |
c8566350 | 707 | dbg_gen("free volume %d", vol->vol_id); |
801c135c | 708 | |
89b96b69 | 709 | ubi->volumes[vol->vol_id] = NULL; |
801c135c AB |
710 | cdev_del(&vol->cdev); |
711 | volume_sysfs_close(vol); | |
712 | } | |
713 | ||
92d124f5 | 714 | #ifdef CONFIG_MTD_UBI_DEBUG |
801c135c AB |
715 | |
716 | /** | |
717 | * paranoid_check_volume - check volume information. | |
718 | * @ubi: UBI device description object | |
719 | * @vol_id: volume ID | |
c8566350 AB |
720 | * |
721 | * Returns zero if volume is all right and a a negative error code if not. | |
801c135c | 722 | */ |
c8566350 | 723 | static int paranoid_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
724 | { |
725 | int idx = vol_id2idx(ubi, vol_id); | |
726 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 727 | const struct ubi_volume *vol; |
801c135c AB |
728 | long long n; |
729 | const char *name; | |
730 | ||
b89044bf | 731 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 732 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 733 | vol = ubi->volumes[idx]; |
801c135c AB |
734 | |
735 | if (!vol) { | |
736 | if (reserved_pebs) { | |
737 | ubi_err("no volume info, but volume exists"); | |
738 | goto fail; | |
739 | } | |
b89044bf | 740 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 741 | return 0; |
801c135c AB |
742 | } |
743 | ||
744 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
745 | vol->name_len < 0) { | |
746 | ubi_err("negative values"); | |
747 | goto fail; | |
748 | } | |
749 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
750 | ubi_err("bad alignment"); | |
751 | goto fail; | |
752 | } | |
753 | ||
cadb40cc | 754 | n = vol->alignment & (ubi->min_io_size - 1); |
801c135c AB |
755 | if (vol->alignment != 1 && n) { |
756 | ubi_err("alignment is not multiple of min I/O unit"); | |
757 | goto fail; | |
758 | } | |
759 | ||
760 | n = ubi->leb_size % vol->alignment; | |
761 | if (vol->data_pad != n) { | |
762 | ubi_err("bad data_pad, has to be %lld", n); | |
763 | goto fail; | |
764 | } | |
765 | ||
766 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
767 | vol->vol_type != UBI_STATIC_VOLUME) { | |
768 | ubi_err("bad vol_type"); | |
769 | goto fail; | |
770 | } | |
771 | ||
801c135c AB |
772 | if (vol->upd_marker && vol->corrupted) { |
773 | dbg_err("update marker and corrupted simultaneously"); | |
774 | goto fail; | |
775 | } | |
776 | ||
777 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
778 | ubi_err("too large reserved_pebs"); | |
779 | goto fail; | |
780 | } | |
781 | ||
782 | n = ubi->leb_size - vol->data_pad; | |
783 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
784 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
785 | goto fail; | |
786 | } | |
787 | ||
788 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
789 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
790 | goto fail; | |
791 | } | |
792 | ||
801c135c AB |
793 | n = strnlen(vol->name, vol->name_len + 1); |
794 | if (n != vol->name_len) { | |
795 | ubi_err("bad name_len %lld", n); | |
796 | goto fail; | |
797 | } | |
798 | ||
d08c3b78 | 799 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c | 800 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
896c0c06 | 801 | if (vol->corrupted) { |
801c135c AB |
802 | ubi_err("corrupted dynamic volume"); |
803 | goto fail; | |
804 | } | |
805 | if (vol->used_ebs != vol->reserved_pebs) { | |
806 | ubi_err("bad used_ebs"); | |
807 | goto fail; | |
808 | } | |
809 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
810 | ubi_err("bad last_eb_bytes"); | |
811 | goto fail; | |
812 | } | |
813 | if (vol->used_bytes != n) { | |
814 | ubi_err("bad used_bytes"); | |
815 | goto fail; | |
816 | } | |
817 | } else { | |
801c135c AB |
818 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
819 | ubi_err("bad used_ebs"); | |
820 | goto fail; | |
821 | } | |
822 | if (vol->last_eb_bytes < 0 || | |
823 | vol->last_eb_bytes > vol->usable_leb_size) { | |
824 | ubi_err("bad last_eb_bytes"); | |
825 | goto fail; | |
826 | } | |
827 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
828 | vol->used_bytes < n - vol->usable_leb_size) { | |
829 | ubi_err("bad used_bytes"); | |
830 | goto fail; | |
831 | } | |
832 | } | |
833 | ||
3261ebd7 CH |
834 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
835 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
836 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); | |
801c135c AB |
837 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
838 | name = &ubi->vtbl[vol_id].name[0]; | |
839 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
840 | vol_type = UBI_DYNAMIC_VOLUME; | |
841 | else | |
842 | vol_type = UBI_STATIC_VOLUME; | |
843 | ||
844 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
845 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
9c9ec147 | 846 | name_len != vol->name_len || strncmp(name, vol->name, name_len)) { |
801c135c AB |
847 | ubi_err("volume info is different"); |
848 | goto fail; | |
849 | } | |
850 | ||
b89044bf | 851 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 852 | return 0; |
801c135c AB |
853 | |
854 | fail: | |
94784d91 | 855 | ubi_err("paranoid check failed for volume %d", vol_id); |
f40ac9cd | 856 | if (vol) |
c8566350 | 857 | ubi_dbg_dump_vol_info(vol); |
f40ac9cd | 858 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
cfcf0ec8 | 859 | dump_stack(); |
b89044bf | 860 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 861 | return -EINVAL; |
801c135c AB |
862 | } |
863 | ||
864 | /** | |
865 | * paranoid_check_volumes - check information about all volumes. | |
866 | * @ubi: UBI device description object | |
c8566350 AB |
867 | * |
868 | * Returns zero if volumes are all right and a a negative error code if not. | |
801c135c | 869 | */ |
c8566350 | 870 | static int paranoid_check_volumes(struct ubi_device *ubi) |
801c135c | 871 | { |
c8566350 | 872 | int i, err = 0; |
801c135c | 873 | |
2a734bb8 | 874 | if (!ubi->dbg->chk_gen) |
92d124f5 AB |
875 | return 0; |
876 | ||
c8566350 AB |
877 | for (i = 0; i < ubi->vtbl_slots; i++) { |
878 | err = paranoid_check_volume(ubi, i); | |
879 | if (err) | |
880 | break; | |
881 | } | |
882 | ||
883 | return err; | |
801c135c AB |
884 | } |
885 | #endif |