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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> |
801c135c AB |
28 | #include "ubi.h" |
29 | ||
30 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
c8566350 | 31 | static int paranoid_check_volumes(struct ubi_device *ubi); |
801c135c | 32 | #else |
c8566350 | 33 | #define paranoid_check_volumes(ubi) 0 |
801c135c AB |
34 | #endif |
35 | ||
36 | static ssize_t vol_attribute_show(struct device *dev, | |
37 | struct device_attribute *attr, char *buf); | |
38 | ||
39 | /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */ | |
8bc22961 | 40 | static struct device_attribute attr_vol_reserved_ebs = |
801c135c | 41 | __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 42 | static struct device_attribute attr_vol_type = |
801c135c | 43 | __ATTR(type, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 44 | static struct device_attribute attr_vol_name = |
801c135c | 45 | __ATTR(name, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 46 | static struct device_attribute attr_vol_corrupted = |
801c135c | 47 | __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 48 | static struct device_attribute attr_vol_alignment = |
801c135c | 49 | __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 50 | static struct device_attribute attr_vol_usable_eb_size = |
801c135c | 51 | __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 52 | static struct device_attribute attr_vol_data_bytes = |
801c135c | 53 | __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 54 | static struct device_attribute attr_vol_upd_marker = |
801c135c AB |
55 | __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL); |
56 | ||
57 | /* | |
58 | * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'. | |
59 | * | |
60 | * Consider a situation: | |
61 | * A. process 1 opens a sysfs file related to volume Y, say | |
62 | * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs; | |
63 | * B. process 2 removes volume Y; | |
64 | * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file; | |
65 | * | |
d05c77a8 AB |
66 | * In this situation, this function will return %-ENODEV because it will find |
67 | * out that the volume was removed from the @ubi->volumes array. | |
801c135c AB |
68 | */ |
69 | static ssize_t vol_attribute_show(struct device *dev, | |
70 | struct device_attribute *attr, char *buf) | |
71 | { | |
d05c77a8 | 72 | int ret; |
801c135c | 73 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
e73f4459 AB |
74 | struct ubi_device *ubi; |
75 | ||
76 | ubi = ubi_get_device(vol->ubi->ubi_num); | |
77 | if (!ubi) | |
78 | return -ENODEV; | |
801c135c | 79 | |
d05c77a8 AB |
80 | spin_lock(&ubi->volumes_lock); |
81 | if (!ubi->volumes[vol->vol_id]) { | |
82 | spin_unlock(&ubi->volumes_lock); | |
e73f4459 | 83 | ubi_put_device(ubi); |
d05c77a8 | 84 | return -ENODEV; |
801c135c | 85 | } |
d05c77a8 AB |
86 | /* Take a reference to prevent volume removal */ |
87 | vol->ref_count += 1; | |
88 | spin_unlock(&ubi->volumes_lock); | |
732aeacf | 89 | |
8bc22961 | 90 | if (attr == &attr_vol_reserved_ebs) |
801c135c | 91 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); |
8bc22961 | 92 | else if (attr == &attr_vol_type) { |
801c135c | 93 | const char *tp; |
8bc22961 AB |
94 | |
95 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
96 | tp = "dynamic"; | |
97 | else | |
98 | tp = "static"; | |
801c135c | 99 | ret = sprintf(buf, "%s\n", tp); |
8bc22961 | 100 | } else if (attr == &attr_vol_name) |
801c135c | 101 | ret = sprintf(buf, "%s\n", vol->name); |
8bc22961 | 102 | else if (attr == &attr_vol_corrupted) |
801c135c | 103 | ret = sprintf(buf, "%d\n", vol->corrupted); |
8bc22961 | 104 | else if (attr == &attr_vol_alignment) |
801c135c | 105 | ret = sprintf(buf, "%d\n", vol->alignment); |
732aeacf | 106 | else if (attr == &attr_vol_usable_eb_size) |
801c135c | 107 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); |
732aeacf | 108 | else if (attr == &attr_vol_data_bytes) |
801c135c | 109 | ret = sprintf(buf, "%lld\n", vol->used_bytes); |
8bc22961 | 110 | else if (attr == &attr_vol_upd_marker) |
801c135c AB |
111 | ret = sprintf(buf, "%d\n", vol->upd_marker); |
112 | else | |
d05c77a8 AB |
113 | /* This must be a bug */ |
114 | ret = -EINVAL; | |
115 | ||
e73f4459 | 116 | /* We've done the operation, drop volume and UBI device references */ |
d05c77a8 AB |
117 | spin_lock(&ubi->volumes_lock); |
118 | vol->ref_count -= 1; | |
119 | ubi_assert(vol->ref_count >= 0); | |
120 | spin_unlock(&ubi->volumes_lock); | |
e73f4459 | 121 | ubi_put_device(ubi); |
801c135c AB |
122 | return ret; |
123 | } | |
124 | ||
125 | /* Release method for volume devices */ | |
126 | static void vol_release(struct device *dev) | |
127 | { | |
128 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); | |
732aeacf | 129 | |
abc5e922 | 130 | kfree(vol->eba_tbl); |
801c135c AB |
131 | kfree(vol); |
132 | } | |
133 | ||
134 | /** | |
135 | * volume_sysfs_init - initialize sysfs for new volume. | |
136 | * @ubi: UBI device description object | |
137 | * @vol: volume description object | |
138 | * | |
139 | * This function returns zero in case of success and a negative error code in | |
140 | * case of failure. | |
141 | * | |
142 | * Note, this function does not free allocated resources in case of failure - | |
143 | * the caller does it. This is because this would cause release() here and the | |
144 | * caller would oops. | |
145 | */ | |
146 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) | |
147 | { | |
148 | int err; | |
149 | ||
8bc22961 | 150 | err = device_create_file(&vol->dev, &attr_vol_reserved_ebs); |
801c135c AB |
151 | if (err) |
152 | return err; | |
8bc22961 | 153 | err = device_create_file(&vol->dev, &attr_vol_type); |
801c135c AB |
154 | if (err) |
155 | return err; | |
8bc22961 | 156 | err = device_create_file(&vol->dev, &attr_vol_name); |
801c135c AB |
157 | if (err) |
158 | return err; | |
8bc22961 | 159 | err = device_create_file(&vol->dev, &attr_vol_corrupted); |
801c135c AB |
160 | if (err) |
161 | return err; | |
8bc22961 | 162 | err = device_create_file(&vol->dev, &attr_vol_alignment); |
801c135c AB |
163 | if (err) |
164 | return err; | |
8bc22961 | 165 | err = device_create_file(&vol->dev, &attr_vol_usable_eb_size); |
801c135c AB |
166 | if (err) |
167 | return err; | |
8bc22961 | 168 | err = device_create_file(&vol->dev, &attr_vol_data_bytes); |
801c135c AB |
169 | if (err) |
170 | return err; | |
8bc22961 | 171 | err = device_create_file(&vol->dev, &attr_vol_upd_marker); |
fc75a1e1 | 172 | return err; |
801c135c AB |
173 | } |
174 | ||
175 | /** | |
176 | * volume_sysfs_close - close sysfs for a volume. | |
177 | * @vol: volume description object | |
178 | */ | |
179 | static void volume_sysfs_close(struct ubi_volume *vol) | |
180 | { | |
8bc22961 AB |
181 | device_remove_file(&vol->dev, &attr_vol_upd_marker); |
182 | device_remove_file(&vol->dev, &attr_vol_data_bytes); | |
183 | device_remove_file(&vol->dev, &attr_vol_usable_eb_size); | |
184 | device_remove_file(&vol->dev, &attr_vol_alignment); | |
185 | device_remove_file(&vol->dev, &attr_vol_corrupted); | |
186 | device_remove_file(&vol->dev, &attr_vol_name); | |
187 | device_remove_file(&vol->dev, &attr_vol_type); | |
188 | device_remove_file(&vol->dev, &attr_vol_reserved_ebs); | |
801c135c AB |
189 | device_unregister(&vol->dev); |
190 | } | |
191 | ||
192 | /** | |
193 | * ubi_create_volume - create volume. | |
194 | * @ubi: UBI device description object | |
195 | * @req: volume creation request | |
196 | * | |
197 | * This function creates volume described by @req. If @req->vol_id id | |
d05c77a8 | 198 | * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume |
801c135c | 199 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
40e4d0c1 | 200 | * error code in case of failure. Note, the caller has to have the |
f089c0b2 | 201 | * @ubi->device_mutex locked. |
801c135c AB |
202 | */ |
203 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
204 | { | |
abc5e922 | 205 | int i, err, vol_id = req->vol_id, do_free = 1; |
801c135c AB |
206 | struct ubi_volume *vol; |
207 | struct ubi_vtbl_record vtbl_rec; | |
49dfc299 | 208 | dev_t dev; |
801c135c AB |
209 | |
210 | if (ubi->ro_mode) | |
211 | return -EROFS; | |
212 | ||
213 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); | |
214 | if (!vol) | |
215 | return -ENOMEM; | |
216 | ||
217 | spin_lock(&ubi->volumes_lock); | |
801c135c AB |
218 | if (vol_id == UBI_VOL_NUM_AUTO) { |
219 | /* Find unused volume ID */ | |
c8566350 | 220 | dbg_gen("search for vacant volume ID"); |
801c135c AB |
221 | for (i = 0; i < ubi->vtbl_slots; i++) |
222 | if (!ubi->volumes[i]) { | |
223 | vol_id = i; | |
224 | break; | |
225 | } | |
226 | ||
227 | if (vol_id == UBI_VOL_NUM_AUTO) { | |
228 | dbg_err("out of volume IDs"); | |
229 | err = -ENFILE; | |
230 | goto out_unlock; | |
231 | } | |
232 | req->vol_id = vol_id; | |
233 | } | |
234 | ||
c8566350 | 235 | dbg_gen("volume ID %d, %llu bytes, type %d, name %s", |
801c135c AB |
236 | vol_id, (unsigned long long)req->bytes, |
237 | (int)req->vol_type, req->name); | |
238 | ||
239 | /* Ensure that this volume does not exist */ | |
240 | err = -EEXIST; | |
241 | if (ubi->volumes[vol_id]) { | |
242 | dbg_err("volume %d already exists", vol_id); | |
243 | goto out_unlock; | |
244 | } | |
245 | ||
246 | /* Ensure that the name is unique */ | |
247 | for (i = 0; i < ubi->vtbl_slots; i++) | |
248 | if (ubi->volumes[i] && | |
249 | ubi->volumes[i]->name_len == req->name_len && | |
94784d91 | 250 | !strcmp(ubi->volumes[i]->name, req->name)) { |
801c135c AB |
251 | dbg_err("volume \"%s\" exists (ID %d)", req->name, i); |
252 | goto out_unlock; | |
253 | } | |
254 | ||
9c9ec147 | 255 | /* Calculate how many eraseblocks are requested */ |
801c135c | 256 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; |
3013ee31 AB |
257 | vol->reserved_pebs += div_u64(req->bytes + vol->usable_leb_size - 1, |
258 | vol->usable_leb_size); | |
801c135c AB |
259 | |
260 | /* Reserve physical eraseblocks */ | |
261 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
262 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); | |
801c135c AB |
263 | err = -ENOSPC; |
264 | goto out_unlock; | |
265 | } | |
266 | ubi->avail_pebs -= vol->reserved_pebs; | |
267 | ubi->rsvd_pebs += vol->reserved_pebs; | |
e73f4459 | 268 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
269 | |
270 | vol->vol_id = vol_id; | |
271 | vol->alignment = req->alignment; | |
272 | vol->data_pad = ubi->leb_size % vol->alignment; | |
273 | vol->vol_type = req->vol_type; | |
274 | vol->name_len = req->name_len; | |
a6ea4407 | 275 | memcpy(vol->name, req->name, vol->name_len); |
801c135c | 276 | vol->ubi = ubi; |
801c135c AB |
277 | |
278 | /* | |
279 | * Finish all pending erases because there may be some LEBs belonging | |
280 | * to the same volume ID. | |
281 | */ | |
282 | err = ubi_wl_flush(ubi); | |
283 | if (err) | |
284 | goto out_acc; | |
285 | ||
286 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
287 | if (!vol->eba_tbl) { | |
288 | err = -ENOMEM; | |
289 | goto out_acc; | |
290 | } | |
291 | ||
292 | for (i = 0; i < vol->reserved_pebs; i++) | |
293 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
294 | ||
295 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
296 | vol->used_ebs = vol->reserved_pebs; | |
297 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
298 | vol->used_bytes = |
299 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c | 300 | } else { |
3013ee31 AB |
301 | vol->used_ebs = div_u64_rem(vol->used_bytes, |
302 | vol->usable_leb_size, | |
303 | &vol->last_eb_bytes); | |
304 | if (vol->last_eb_bytes != 0) | |
801c135c AB |
305 | vol->used_ebs += 1; |
306 | else | |
307 | vol->last_eb_bytes = vol->usable_leb_size; | |
308 | } | |
309 | ||
310 | /* Register character device for the volume */ | |
311 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
312 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
313 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
314 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 315 | if (err) { |
01f7b309 | 316 | ubi_err("cannot add character device"); |
801c135c AB |
317 | goto out_mapping; |
318 | } | |
319 | ||
320 | err = ubi_create_gluebi(ubi, vol); | |
321 | if (err) | |
322 | goto out_cdev; | |
323 | ||
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"); | |
801c135c | 333 | goto out_gluebi; |
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 | ||
c8566350 AB |
361 | err = paranoid_check_volumes(ubi); |
362 | return err; | |
801c135c | 363 | |
fc75a1e1 AB |
364 | out_sysfs: |
365 | /* | |
abc5e922 | 366 | * We have registered our device, we should not free the volume |
fc75a1e1 AB |
367 | * description object in this function in case of an error - it is |
368 | * freed by the release function. | |
369 | * | |
370 | * Get device reference to prevent the release function from being | |
371 | * called just after sysfs has been closed. | |
372 | */ | |
abc5e922 | 373 | do_free = 0; |
fc75a1e1 AB |
374 | get_device(&vol->dev); |
375 | volume_sysfs_close(vol); | |
801c135c | 376 | out_gluebi: |
fc398769 ÇO |
377 | if (ubi_destroy_gluebi(vol)) |
378 | dbg_err("cannot destroy gluebi for volume %d:%d", | |
379 | ubi->ubi_num, vol_id); | |
801c135c AB |
380 | out_cdev: |
381 | cdev_del(&vol->cdev); | |
382 | out_mapping: | |
abc5e922 AB |
383 | if (do_free) |
384 | kfree(vol->eba_tbl); | |
801c135c AB |
385 | out_acc: |
386 | spin_lock(&ubi->volumes_lock); | |
387 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
388 | ubi->avail_pebs += vol->reserved_pebs; | |
389 | out_unlock: | |
390 | spin_unlock(&ubi->volumes_lock); | |
abc5e922 | 391 | if (do_free) |
fc75a1e1 | 392 | kfree(vol); |
abc5e922 AB |
393 | else |
394 | put_device(&vol->dev); | |
01f7b309 | 395 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
396 | return err; |
397 | } | |
398 | ||
399 | /** | |
400 | * ubi_remove_volume - remove volume. | |
401 | * @desc: volume descriptor | |
f40ac9cd | 402 | * @no_vtbl: do not change volume table if not zero |
801c135c AB |
403 | * |
404 | * This function removes volume described by @desc. The volume has to be opened | |
405 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
f089c0b2 | 406 | * code in case of failure. The caller has to have the @ubi->device_mutex |
40e4d0c1 | 407 | * locked. |
801c135c | 408 | */ |
f40ac9cd | 409 | int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) |
801c135c AB |
410 | { |
411 | struct ubi_volume *vol = desc->vol; | |
412 | struct ubi_device *ubi = vol->ubi; | |
413 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
414 | ||
c8566350 | 415 | dbg_gen("remove UBI volume %d", vol_id); |
801c135c AB |
416 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
417 | ubi_assert(vol == ubi->volumes[vol_id]); | |
418 | ||
419 | if (ubi->ro_mode) | |
420 | return -EROFS; | |
421 | ||
d05c77a8 AB |
422 | spin_lock(&ubi->volumes_lock); |
423 | if (vol->ref_count > 1) { | |
424 | /* | |
425 | * The volume is busy, probably someone is reading one of its | |
426 | * sysfs files. | |
427 | */ | |
428 | err = -EBUSY; | |
429 | goto out_unlock; | |
430 | } | |
431 | ubi->volumes[vol_id] = NULL; | |
432 | spin_unlock(&ubi->volumes_lock); | |
433 | ||
801c135c AB |
434 | err = ubi_destroy_gluebi(vol); |
435 | if (err) | |
d05c77a8 | 436 | goto out_err; |
801c135c | 437 | |
f40ac9cd AB |
438 | if (!no_vtbl) { |
439 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
440 | if (err) | |
441 | goto out_err; | |
442 | } | |
801c135c AB |
443 | |
444 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 445 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 446 | if (err) |
d05c77a8 | 447 | goto out_err; |
801c135c AB |
448 | } |
449 | ||
801c135c AB |
450 | cdev_del(&vol->cdev); |
451 | volume_sysfs_close(vol); | |
801c135c AB |
452 | |
453 | spin_lock(&ubi->volumes_lock); | |
454 | ubi->rsvd_pebs -= reserved_pebs; | |
455 | ubi->avail_pebs += reserved_pebs; | |
456 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
457 | if (i > 0) { | |
458 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; | |
459 | ubi->avail_pebs -= i; | |
460 | ubi->rsvd_pebs += i; | |
461 | ubi->beb_rsvd_pebs += i; | |
462 | if (i > 0) | |
463 | ubi_msg("reserve more %d PEBs", i); | |
464 | } | |
465 | ubi->vol_count -= 1; | |
466 | spin_unlock(&ubi->volumes_lock); | |
467 | ||
f40ac9cd AB |
468 | if (!no_vtbl) |
469 | err = paranoid_check_volumes(ubi); | |
c8566350 | 470 | return err; |
d05c77a8 AB |
471 | |
472 | out_err: | |
473 | ubi_err("cannot remove volume %d, error %d", vol_id, err); | |
474 | spin_lock(&ubi->volumes_lock); | |
475 | ubi->volumes[vol_id] = vol; | |
476 | out_unlock: | |
477 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 478 | return err; |
801c135c AB |
479 | } |
480 | ||
481 | /** | |
482 | * ubi_resize_volume - re-size volume. | |
483 | * @desc: volume descriptor | |
484 | * @reserved_pebs: new size in physical eraseblocks | |
485 | * | |
40e4d0c1 AB |
486 | * This function re-sizes the volume and returns zero in case of success, and a |
487 | * negative error code in case of failure. The caller has to have the | |
f089c0b2 | 488 | * @ubi->device_mutex locked. |
801c135c AB |
489 | */ |
490 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
491 | { | |
492 | int i, err, pebs, *new_mapping; | |
493 | struct ubi_volume *vol = desc->vol; | |
494 | struct ubi_device *ubi = vol->ubi; | |
495 | struct ubi_vtbl_record vtbl_rec; | |
496 | int vol_id = vol->vol_id; | |
497 | ||
498 | if (ubi->ro_mode) | |
499 | return -EROFS; | |
500 | ||
c8566350 | 501 | dbg_gen("re-size volume %d to from %d to %d PEBs", |
801c135c | 502 | vol_id, vol->reserved_pebs, reserved_pebs); |
801c135c AB |
503 | |
504 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
505 | reserved_pebs < vol->used_ebs) { | |
506 | dbg_err("too small size %d, %d LEBs contain data", | |
507 | reserved_pebs, vol->used_ebs); | |
508 | return -EINVAL; | |
509 | } | |
510 | ||
511 | /* If the size is the same, we have nothing to do */ | |
512 | if (reserved_pebs == vol->reserved_pebs) | |
513 | return 0; | |
514 | ||
515 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
516 | if (!new_mapping) | |
517 | return -ENOMEM; | |
518 | ||
519 | for (i = 0; i < reserved_pebs; i++) | |
520 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
521 | ||
d05c77a8 AB |
522 | spin_lock(&ubi->volumes_lock); |
523 | if (vol->ref_count > 1) { | |
524 | spin_unlock(&ubi->volumes_lock); | |
525 | err = -EBUSY; | |
526 | goto out_free; | |
527 | } | |
528 | spin_unlock(&ubi->volumes_lock); | |
529 | ||
d05c77a8 | 530 | /* Reserve physical eraseblocks */ |
801c135c AB |
531 | pebs = reserved_pebs - vol->reserved_pebs; |
532 | if (pebs > 0) { | |
533 | spin_lock(&ubi->volumes_lock); | |
534 | if (pebs > ubi->avail_pebs) { | |
535 | dbg_err("not enough PEBs: requested %d, available %d", | |
536 | pebs, ubi->avail_pebs); | |
537 | spin_unlock(&ubi->volumes_lock); | |
538 | err = -ENOSPC; | |
539 | goto out_free; | |
540 | } | |
541 | ubi->avail_pebs -= pebs; | |
542 | ubi->rsvd_pebs += pebs; | |
543 | for (i = 0; i < vol->reserved_pebs; i++) | |
544 | new_mapping[i] = vol->eba_tbl[i]; | |
545 | kfree(vol->eba_tbl); | |
546 | vol->eba_tbl = new_mapping; | |
547 | spin_unlock(&ubi->volumes_lock); | |
548 | } | |
549 | ||
550 | /* Change volume table record */ | |
551 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); | |
3261ebd7 | 552 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); |
801c135c AB |
553 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
554 | if (err) | |
555 | goto out_acc; | |
556 | ||
557 | if (pebs < 0) { | |
558 | for (i = 0; i < -pebs; i++) { | |
89b96b69 | 559 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
560 | if (err) |
561 | goto out_acc; | |
562 | } | |
563 | spin_lock(&ubi->volumes_lock); | |
564 | ubi->rsvd_pebs += pebs; | |
565 | ubi->avail_pebs -= pebs; | |
566 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
567 | if (pebs > 0) { | |
568 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; | |
569 | ubi->avail_pebs -= pebs; | |
570 | ubi->rsvd_pebs += pebs; | |
571 | ubi->beb_rsvd_pebs += pebs; | |
572 | if (pebs > 0) | |
573 | ubi_msg("reserve more %d PEBs", pebs); | |
574 | } | |
575 | for (i = 0; i < reserved_pebs; i++) | |
576 | new_mapping[i] = vol->eba_tbl[i]; | |
577 | kfree(vol->eba_tbl); | |
578 | vol->eba_tbl = new_mapping; | |
579 | spin_unlock(&ubi->volumes_lock); | |
580 | } | |
581 | ||
582 | vol->reserved_pebs = reserved_pebs; | |
583 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
584 | vol->used_ebs = reserved_pebs; | |
585 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
586 | vol->used_bytes = |
587 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
588 | } |
589 | ||
c8566350 AB |
590 | err = paranoid_check_volumes(ubi); |
591 | return err; | |
801c135c AB |
592 | |
593 | out_acc: | |
594 | if (pebs > 0) { | |
595 | spin_lock(&ubi->volumes_lock); | |
596 | ubi->rsvd_pebs -= pebs; | |
597 | ubi->avail_pebs += pebs; | |
598 | spin_unlock(&ubi->volumes_lock); | |
599 | } | |
600 | out_free: | |
601 | kfree(new_mapping); | |
602 | return err; | |
603 | } | |
604 | ||
f40ac9cd AB |
605 | /** |
606 | * ubi_rename_volumes - re-name UBI volumes. | |
607 | * @ubi: UBI device description object | |
ebaaf1af | 608 | * @rename_list: list of &struct ubi_rename_entry objects |
f40ac9cd AB |
609 | * |
610 | * This function re-names or removes volumes specified in the re-name list. | |
611 | * Returns zero in case of success and a negative error code in case of | |
612 | * failure. | |
613 | */ | |
614 | int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) | |
615 | { | |
616 | int err; | |
617 | struct ubi_rename_entry *re; | |
618 | ||
619 | err = ubi_vtbl_rename_volumes(ubi, rename_list); | |
620 | if (err) | |
621 | return err; | |
622 | ||
623 | list_for_each_entry(re, rename_list, list) { | |
624 | if (re->remove) { | |
625 | err = ubi_remove_volume(re->desc, 1); | |
626 | if (err) | |
627 | break; | |
628 | } else { | |
629 | struct ubi_volume *vol = re->desc->vol; | |
630 | ||
631 | spin_lock(&ubi->volumes_lock); | |
632 | vol->name_len = re->new_name_len; | |
633 | memcpy(vol->name, re->new_name, re->new_name_len + 1); | |
634 | spin_unlock(&ubi->volumes_lock); | |
635 | } | |
636 | } | |
637 | ||
638 | if (!err) | |
eeb16e87 | 639 | err = paranoid_check_volumes(ubi); |
f40ac9cd AB |
640 | return err; |
641 | } | |
642 | ||
801c135c AB |
643 | /** |
644 | * ubi_add_volume - add volume. | |
645 | * @ubi: UBI device description object | |
89b96b69 | 646 | * @vol: volume description object |
801c135c | 647 | * |
d05c77a8 AB |
648 | * This function adds an existing volume and initializes all its data |
649 | * structures. Returns zero in case of success and a negative error code in | |
801c135c AB |
650 | * case of failure. |
651 | */ | |
89b96b69 | 652 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 653 | { |
89b96b69 | 654 | int err, vol_id = vol->vol_id; |
49dfc299 | 655 | dev_t dev; |
801c135c | 656 | |
c8566350 | 657 | dbg_gen("add volume %d", vol_id); |
801c135c AB |
658 | |
659 | /* Register character device for the volume */ | |
660 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
661 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
662 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
663 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 664 | if (err) { |
01f7b309 AB |
665 | ubi_err("cannot add character device for volume %d, error %d", |
666 | vol_id, err); | |
801c135c AB |
667 | return err; |
668 | } | |
669 | ||
670 | err = ubi_create_gluebi(ubi, vol); | |
671 | if (err) | |
672 | goto out_cdev; | |
673 | ||
674 | vol->dev.release = vol_release; | |
675 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 676 | vol->dev.devt = dev; |
801c135c | 677 | vol->dev.class = ubi_class; |
475b44c1 | 678 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c AB |
679 | err = device_register(&vol->dev); |
680 | if (err) | |
681 | goto out_gluebi; | |
682 | ||
683 | err = volume_sysfs_init(ubi, vol); | |
684 | if (err) { | |
685 | cdev_del(&vol->cdev); | |
686 | err = ubi_destroy_gluebi(vol); | |
687 | volume_sysfs_close(vol); | |
688 | return err; | |
689 | } | |
690 | ||
c8566350 AB |
691 | err = paranoid_check_volumes(ubi); |
692 | return err; | |
801c135c AB |
693 | |
694 | out_gluebi: | |
695 | err = ubi_destroy_gluebi(vol); | |
696 | out_cdev: | |
697 | cdev_del(&vol->cdev); | |
698 | return err; | |
699 | } | |
700 | ||
701 | /** | |
702 | * ubi_free_volume - free volume. | |
703 | * @ubi: UBI device description object | |
89b96b69 | 704 | * @vol: volume description object |
801c135c | 705 | * |
89b96b69 | 706 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
707 | * Used only when the UBI device is detached. |
708 | */ | |
89b96b69 | 709 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c AB |
710 | { |
711 | int err; | |
801c135c | 712 | |
c8566350 | 713 | dbg_gen("free volume %d", vol->vol_id); |
801c135c | 714 | |
89b96b69 | 715 | ubi->volumes[vol->vol_id] = NULL; |
d05c77a8 | 716 | err = ubi_destroy_gluebi(vol); |
801c135c AB |
717 | cdev_del(&vol->cdev); |
718 | volume_sysfs_close(vol); | |
719 | } | |
720 | ||
721 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
722 | ||
723 | /** | |
724 | * paranoid_check_volume - check volume information. | |
725 | * @ubi: UBI device description object | |
726 | * @vol_id: volume ID | |
c8566350 AB |
727 | * |
728 | * Returns zero if volume is all right and a a negative error code if not. | |
801c135c | 729 | */ |
c8566350 | 730 | static int paranoid_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
731 | { |
732 | int idx = vol_id2idx(ubi, vol_id); | |
733 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 734 | const struct ubi_volume *vol; |
801c135c AB |
735 | long long n; |
736 | const char *name; | |
737 | ||
b89044bf | 738 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 739 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 740 | vol = ubi->volumes[idx]; |
801c135c AB |
741 | |
742 | if (!vol) { | |
743 | if (reserved_pebs) { | |
744 | ubi_err("no volume info, but volume exists"); | |
745 | goto fail; | |
746 | } | |
b89044bf | 747 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 748 | return 0; |
801c135c AB |
749 | } |
750 | ||
751 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
752 | vol->name_len < 0) { | |
753 | ubi_err("negative values"); | |
754 | goto fail; | |
755 | } | |
756 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
757 | ubi_err("bad alignment"); | |
758 | goto fail; | |
759 | } | |
760 | ||
cadb40cc | 761 | n = vol->alignment & (ubi->min_io_size - 1); |
801c135c AB |
762 | if (vol->alignment != 1 && n) { |
763 | ubi_err("alignment is not multiple of min I/O unit"); | |
764 | goto fail; | |
765 | } | |
766 | ||
767 | n = ubi->leb_size % vol->alignment; | |
768 | if (vol->data_pad != n) { | |
769 | ubi_err("bad data_pad, has to be %lld", n); | |
770 | goto fail; | |
771 | } | |
772 | ||
773 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
774 | vol->vol_type != UBI_STATIC_VOLUME) { | |
775 | ubi_err("bad vol_type"); | |
776 | goto fail; | |
777 | } | |
778 | ||
801c135c AB |
779 | if (vol->upd_marker && vol->corrupted) { |
780 | dbg_err("update marker and corrupted simultaneously"); | |
781 | goto fail; | |
782 | } | |
783 | ||
784 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
785 | ubi_err("too large reserved_pebs"); | |
786 | goto fail; | |
787 | } | |
788 | ||
789 | n = ubi->leb_size - vol->data_pad; | |
790 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
791 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
792 | goto fail; | |
793 | } | |
794 | ||
795 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
796 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
797 | goto fail; | |
798 | } | |
799 | ||
800 | if (!vol->name) { | |
801 | ubi_err("NULL volume name"); | |
802 | goto fail; | |
803 | } | |
804 | ||
805 | n = strnlen(vol->name, vol->name_len + 1); | |
806 | if (n != vol->name_len) { | |
807 | ubi_err("bad name_len %lld", n); | |
808 | goto fail; | |
809 | } | |
810 | ||
d08c3b78 | 811 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c | 812 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
896c0c06 | 813 | if (vol->corrupted) { |
801c135c AB |
814 | ubi_err("corrupted dynamic volume"); |
815 | goto fail; | |
816 | } | |
817 | if (vol->used_ebs != vol->reserved_pebs) { | |
818 | ubi_err("bad used_ebs"); | |
819 | goto fail; | |
820 | } | |
821 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
822 | ubi_err("bad last_eb_bytes"); | |
823 | goto fail; | |
824 | } | |
825 | if (vol->used_bytes != n) { | |
826 | ubi_err("bad used_bytes"); | |
827 | goto fail; | |
828 | } | |
829 | } else { | |
801c135c AB |
830 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
831 | ubi_err("bad used_ebs"); | |
832 | goto fail; | |
833 | } | |
834 | if (vol->last_eb_bytes < 0 || | |
835 | vol->last_eb_bytes > vol->usable_leb_size) { | |
836 | ubi_err("bad last_eb_bytes"); | |
837 | goto fail; | |
838 | } | |
839 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
840 | vol->used_bytes < n - vol->usable_leb_size) { | |
841 | ubi_err("bad used_bytes"); | |
842 | goto fail; | |
843 | } | |
844 | } | |
845 | ||
3261ebd7 CH |
846 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
847 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
848 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); | |
801c135c AB |
849 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
850 | name = &ubi->vtbl[vol_id].name[0]; | |
851 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
852 | vol_type = UBI_DYNAMIC_VOLUME; | |
853 | else | |
854 | vol_type = UBI_STATIC_VOLUME; | |
855 | ||
856 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
857 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
9c9ec147 | 858 | name_len != vol->name_len || strncmp(name, vol->name, name_len)) { |
801c135c AB |
859 | ubi_err("volume info is different"); |
860 | goto fail; | |
861 | } | |
862 | ||
b89044bf | 863 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 864 | return 0; |
801c135c AB |
865 | |
866 | fail: | |
94784d91 | 867 | ubi_err("paranoid check failed for volume %d", vol_id); |
f40ac9cd | 868 | if (vol) |
c8566350 | 869 | ubi_dbg_dump_vol_info(vol); |
f40ac9cd | 870 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
b89044bf | 871 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 872 | return -EINVAL; |
801c135c AB |
873 | } |
874 | ||
875 | /** | |
876 | * paranoid_check_volumes - check information about all volumes. | |
877 | * @ubi: UBI device description object | |
c8566350 AB |
878 | * |
879 | * Returns zero if volumes are all right and a a negative error code if not. | |
801c135c | 880 | */ |
c8566350 | 881 | static int paranoid_check_volumes(struct ubi_device *ubi) |
801c135c | 882 | { |
c8566350 | 883 | int i, err = 0; |
801c135c | 884 | |
c8566350 AB |
885 | for (i = 0; i < ubi->vtbl_slots; i++) { |
886 | err = paranoid_check_volume(ubi, i); | |
887 | if (err) | |
888 | break; | |
889 | } | |
890 | ||
891 | return err; | |
801c135c AB |
892 | } |
893 | #endif |