Commit | Line | Data |
---|---|---|
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 | ||
31 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
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); | |
801c135c AB |
264 | err = -ENOSPC; |
265 | goto out_unlock; | |
266 | } | |
267 | ubi->avail_pebs -= vol->reserved_pebs; | |
268 | ubi->rsvd_pebs += vol->reserved_pebs; | |
e73f4459 | 269 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
270 | |
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; | |
a6ea4407 | 276 | memcpy(vol->name, req->name, vol->name_len); |
801c135c | 277 | vol->ubi = ubi; |
801c135c AB |
278 | |
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; | |
d08c3b78 VA |
299 | vol->used_bytes = |
300 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c | 301 | } else { |
3013ee31 AB |
302 | 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) | |
801c135c AB |
306 | 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; | |
49dfc299 AB |
314 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
315 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 316 | if (err) { |
01f7b309 | 317 | ubi_err("cannot add character device"); |
801c135c AB |
318 | goto out_mapping; |
319 | } | |
320 | ||
801c135c AB |
321 | vol->dev.release = vol_release; |
322 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 323 | vol->dev.devt = dev; |
801c135c | 324 | vol->dev.class = ubi_class; |
fc75a1e1 | 325 | |
475b44c1 | 326 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c | 327 | err = device_register(&vol->dev); |
01f7b309 AB |
328 | if (err) { |
329 | ubi_err("cannot register device"); | |
518ceef0 | 330 | goto out_cdev; |
01f7b309 | 331 | } |
801c135c AB |
332 | |
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)); | |
3261ebd7 CH |
339 | 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); | |
801c135c AB |
343 | 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; | |
a6ea4407 | 347 | memcpy(vtbl_rec.name, vol->name, vol->name_len); |
801c135c AB |
348 | |
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); | |
d05c77a8 | 354 | ubi->volumes[vol_id] = vol; |
4b3cc340 | 355 | ubi->vol_count += 1; |
801c135c AB |
356 | spin_unlock(&ubi->volumes_lock); |
357 | ||
0e0ee1cc | 358 | ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED); |
d38dce5b AB |
359 | if (paranoid_check_volumes(ubi)) |
360 | dbg_err("check failed while creating volume %d", vol_id); | |
c8566350 | 361 | return err; |
801c135c | 362 | |
fc75a1e1 AB |
363 | out_sysfs: |
364 | /* | |
abc5e922 | 365 | * We have registered our device, we should not free the volume |
fc75a1e1 AB |
366 | * 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 | */ | |
abc5e922 | 372 | do_free = 0; |
fc75a1e1 AB |
373 | get_device(&vol->dev); |
374 | volume_sysfs_close(vol); | |
801c135c AB |
375 | out_cdev: |
376 | cdev_del(&vol->cdev); | |
377 | out_mapping: | |
abc5e922 AB |
378 | if (do_free) |
379 | kfree(vol->eba_tbl); | |
801c135c AB |
380 | out_acc: |
381 | spin_lock(&ubi->volumes_lock); | |
382 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
383 | ubi->avail_pebs += vol->reserved_pebs; | |
384 | out_unlock: | |
385 | spin_unlock(&ubi->volumes_lock); | |
abc5e922 | 386 | if (do_free) |
fc75a1e1 | 387 | kfree(vol); |
abc5e922 AB |
388 | else |
389 | put_device(&vol->dev); | |
01f7b309 | 390 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
391 | return err; |
392 | } | |
393 | ||
394 | /** | |
395 | * ubi_remove_volume - remove volume. | |
396 | * @desc: volume descriptor | |
f40ac9cd | 397 | * @no_vtbl: do not change volume table if not zero |
801c135c AB |
398 | * |
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 | |
f089c0b2 | 401 | * code in case of failure. The caller has to have the @ubi->device_mutex |
40e4d0c1 | 402 | * locked. |
801c135c | 403 | */ |
f40ac9cd | 404 | int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) |
801c135c AB |
405 | { |
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 | ||
e1cf7e6d | 410 | dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id); |
801c135c AB |
411 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
412 | ubi_assert(vol == ubi->volumes[vol_id]); | |
413 | ||
414 | if (ubi->ro_mode) | |
415 | return -EROFS; | |
416 | ||
d05c77a8 AB |
417 | 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 | ||
f40ac9cd AB |
429 | if (!no_vtbl) { |
430 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
431 | if (err) | |
432 | goto out_err; | |
433 | } | |
801c135c AB |
434 | |
435 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 436 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 437 | if (err) |
d05c77a8 | 438 | goto out_err; |
801c135c AB |
439 | } |
440 | ||
801c135c AB |
441 | cdev_del(&vol->cdev); |
442 | volume_sysfs_close(vol); | |
801c135c AB |
443 | |
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 | ||
0e0ee1cc | 459 | ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED); |
d38dce5b AB |
460 | if (!no_vtbl && paranoid_check_volumes(ubi)) |
461 | dbg_err("check failed while removing volume %d", vol_id); | |
462 | ||
c8566350 | 463 | return err; |
d05c77a8 AB |
464 | |
465 | out_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; | |
469 | out_unlock: | |
470 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 471 | return err; |
801c135c AB |
472 | } |
473 | ||
474 | /** | |
475 | * ubi_resize_volume - re-size volume. | |
476 | * @desc: volume descriptor | |
477 | * @reserved_pebs: new size in physical eraseblocks | |
478 | * | |
40e4d0c1 AB |
479 | * 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 | |
f089c0b2 | 481 | * @ubi->device_mutex locked. |
801c135c AB |
482 | */ |
483 | int 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 | ||
e1cf7e6d AB |
494 | 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); | |
801c135c AB |
496 | |
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 | ||
d05c77a8 AB |
515 | 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 | ||
d05c77a8 | 523 | /* Reserve physical eraseblocks */ |
801c135c AB |
524 | 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)); | |
3261ebd7 | 545 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); |
801c135c AB |
546 | 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++) { | |
89b96b69 | 552 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
553 | 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; | |
d08c3b78 VA |
579 | vol->used_bytes = |
580 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
581 | } |
582 | ||
0e0ee1cc | 583 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED); |
d38dce5b AB |
584 | if (paranoid_check_volumes(ubi)) |
585 | dbg_err("check failed while re-sizing volume %d", vol_id); | |
c8566350 | 586 | return err; |
801c135c AB |
587 | |
588 | out_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 | } | |
595 | out_free: | |
596 | kfree(new_mapping); | |
597 | return err; | |
598 | } | |
599 | ||
f40ac9cd AB |
600 | /** |
601 | * ubi_rename_volumes - re-name UBI volumes. | |
602 | * @ubi: UBI device description object | |
ebaaf1af | 603 | * @rename_list: list of &struct ubi_rename_entry objects |
f40ac9cd AB |
604 | * |
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 | */ | |
609 | int 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); | |
0e0ee1cc | 630 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED); |
f40ac9cd AB |
631 | } |
632 | } | |
633 | ||
d38dce5b AB |
634 | if (!err && paranoid_check_volumes(ubi)) |
635 | ; | |
f40ac9cd AB |
636 | return err; |
637 | } | |
638 | ||
801c135c AB |
639 | /** |
640 | * ubi_add_volume - add volume. | |
641 | * @ubi: UBI device description object | |
89b96b69 | 642 | * @vol: volume description object |
801c135c | 643 | * |
d05c77a8 AB |
644 | * 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 | |
801c135c AB |
646 | * case of failure. |
647 | */ | |
89b96b69 | 648 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 649 | { |
89b96b69 | 650 | int err, vol_id = vol->vol_id; |
49dfc299 | 651 | dev_t dev; |
801c135c | 652 | |
c8566350 | 653 | dbg_gen("add volume %d", vol_id); |
801c135c AB |
654 | |
655 | /* Register character device for the volume */ | |
656 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
657 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
658 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
659 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 660 | if (err) { |
01f7b309 AB |
661 | ubi_err("cannot add character device for volume %d, error %d", |
662 | vol_id, err); | |
801c135c AB |
663 | return err; |
664 | } | |
665 | ||
801c135c AB |
666 | vol->dev.release = vol_release; |
667 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 668 | vol->dev.devt = dev; |
801c135c | 669 | vol->dev.class = ubi_class; |
475b44c1 | 670 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c AB |
671 | err = device_register(&vol->dev); |
672 | if (err) | |
518ceef0 | 673 | goto out_cdev; |
801c135c AB |
674 | |
675 | err = volume_sysfs_init(ubi, vol); | |
676 | if (err) { | |
677 | cdev_del(&vol->cdev); | |
801c135c AB |
678 | volume_sysfs_close(vol); |
679 | return err; | |
680 | } | |
681 | ||
d38dce5b AB |
682 | if (paranoid_check_volumes(ubi)) |
683 | dbg_err("check failed while adding volume %d", vol_id); | |
c8566350 | 684 | return err; |
801c135c | 685 | |
801c135c AB |
686 | out_cdev: |
687 | cdev_del(&vol->cdev); | |
688 | return err; | |
689 | } | |
690 | ||
691 | /** | |
692 | * ubi_free_volume - free volume. | |
693 | * @ubi: UBI device description object | |
89b96b69 | 694 | * @vol: volume description object |
801c135c | 695 | * |
89b96b69 | 696 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
697 | * Used only when the UBI device is detached. |
698 | */ | |
89b96b69 | 699 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 700 | { |
c8566350 | 701 | dbg_gen("free volume %d", vol->vol_id); |
801c135c | 702 | |
89b96b69 | 703 | ubi->volumes[vol->vol_id] = NULL; |
801c135c AB |
704 | 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 | |
c8566350 AB |
714 | * |
715 | * Returns zero if volume is all right and a a negative error code if not. | |
801c135c | 716 | */ |
c8566350 | 717 | static int paranoid_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
718 | { |
719 | int idx = vol_id2idx(ubi, vol_id); | |
720 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 721 | const struct ubi_volume *vol; |
801c135c AB |
722 | long long n; |
723 | const char *name; | |
724 | ||
b89044bf | 725 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 726 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 727 | vol = ubi->volumes[idx]; |
801c135c AB |
728 | |
729 | if (!vol) { | |
730 | if (reserved_pebs) { | |
731 | ubi_err("no volume info, but volume exists"); | |
732 | goto fail; | |
733 | } | |
b89044bf | 734 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 735 | return 0; |
801c135c AB |
736 | } |
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 | ||
cadb40cc | 748 | n = vol->alignment & (ubi->min_io_size - 1); |
801c135c AB |
749 | 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 | ||
801c135c AB |
766 | 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 | ||
d08c3b78 | 798 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c | 799 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
896c0c06 | 800 | if (vol->corrupted) { |
801c135c AB |
801 | 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 { | |
801c135c AB |
817 | 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 | ||
3261ebd7 CH |
833 | 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); | |
801c135c AB |
836 | 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 || | |
9c9ec147 | 845 | name_len != vol->name_len || strncmp(name, vol->name, name_len)) { |
801c135c AB |
846 | ubi_err("volume info is different"); |
847 | goto fail; | |
848 | } | |
849 | ||
b89044bf | 850 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 851 | return 0; |
801c135c AB |
852 | |
853 | fail: | |
94784d91 | 854 | ubi_err("paranoid check failed for volume %d", vol_id); |
f40ac9cd | 855 | if (vol) |
c8566350 | 856 | ubi_dbg_dump_vol_info(vol); |
f40ac9cd | 857 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
cfcf0ec8 | 858 | dump_stack(); |
b89044bf | 859 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 860 | return -EINVAL; |
801c135c AB |
861 | } |
862 | ||
863 | /** | |
864 | * paranoid_check_volumes - check information about all volumes. | |
865 | * @ubi: UBI device description object | |
c8566350 AB |
866 | * |
867 | * Returns zero if volumes are all right and a a negative error code if not. | |
801c135c | 868 | */ |
c8566350 | 869 | static int paranoid_check_volumes(struct ubi_device *ubi) |
801c135c | 870 | { |
c8566350 | 871 | int i, err = 0; |
801c135c | 872 | |
c8566350 AB |
873 | 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; | |
801c135c AB |
880 | } |
881 | #endif |