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> | |
27 | #include <asm/div64.h> | |
28 | #include "ubi.h" | |
29 | ||
30 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
31 | static void paranoid_check_volumes(struct ubi_device *ubi); | |
32 | #else | |
33 | #define paranoid_check_volumes(ubi) | |
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 | * | |
66 | * What we want to do in a situation like that is to return error when the file | |
67 | * is read. This is done by means of the 'removed' flag and the 'vol_lock' of | |
68 | * the UBI volume description object. | |
69 | */ | |
70 | static ssize_t vol_attribute_show(struct device *dev, | |
71 | struct device_attribute *attr, char *buf) | |
72 | { | |
54b2c8f9 | 73 | int ret = -ENODEV; |
801c135c AB |
74 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
75 | ||
76 | spin_lock(&vol->ubi->volumes_lock); | |
77 | if (vol->removed) { | |
78 | spin_unlock(&vol->ubi->volumes_lock); | |
54b2c8f9 | 79 | return ret; |
801c135c | 80 | } |
732aeacf | 81 | |
8bc22961 | 82 | if (attr == &attr_vol_reserved_ebs) |
801c135c | 83 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); |
8bc22961 | 84 | else if (attr == &attr_vol_type) { |
801c135c | 85 | const char *tp; |
8bc22961 AB |
86 | |
87 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
88 | tp = "dynamic"; | |
89 | else | |
90 | tp = "static"; | |
801c135c | 91 | ret = sprintf(buf, "%s\n", tp); |
8bc22961 | 92 | } else if (attr == &attr_vol_name) |
801c135c | 93 | ret = sprintf(buf, "%s\n", vol->name); |
8bc22961 | 94 | else if (attr == &attr_vol_corrupted) |
801c135c | 95 | ret = sprintf(buf, "%d\n", vol->corrupted); |
8bc22961 | 96 | else if (attr == &attr_vol_alignment) |
801c135c | 97 | ret = sprintf(buf, "%d\n", vol->alignment); |
732aeacf | 98 | else if (attr == &attr_vol_usable_eb_size) |
801c135c | 99 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); |
732aeacf | 100 | else if (attr == &attr_vol_data_bytes) |
801c135c | 101 | ret = sprintf(buf, "%lld\n", vol->used_bytes); |
8bc22961 | 102 | else if (attr == &attr_vol_upd_marker) |
801c135c AB |
103 | ret = sprintf(buf, "%d\n", vol->upd_marker); |
104 | else | |
105 | BUG(); | |
106 | spin_unlock(&vol->ubi->volumes_lock); | |
107 | return ret; | |
108 | } | |
109 | ||
110 | /* Release method for volume devices */ | |
111 | static void vol_release(struct device *dev) | |
112 | { | |
113 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); | |
732aeacf | 114 | |
801c135c AB |
115 | kfree(vol); |
116 | } | |
117 | ||
118 | /** | |
119 | * volume_sysfs_init - initialize sysfs for new volume. | |
120 | * @ubi: UBI device description object | |
121 | * @vol: volume description object | |
122 | * | |
123 | * This function returns zero in case of success and a negative error code in | |
124 | * case of failure. | |
125 | * | |
126 | * Note, this function does not free allocated resources in case of failure - | |
127 | * the caller does it. This is because this would cause release() here and the | |
128 | * caller would oops. | |
129 | */ | |
130 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) | |
131 | { | |
132 | int err; | |
133 | ||
8bc22961 | 134 | err = device_create_file(&vol->dev, &attr_vol_reserved_ebs); |
801c135c AB |
135 | if (err) |
136 | return err; | |
8bc22961 | 137 | err = device_create_file(&vol->dev, &attr_vol_type); |
801c135c AB |
138 | if (err) |
139 | return err; | |
8bc22961 | 140 | err = device_create_file(&vol->dev, &attr_vol_name); |
801c135c AB |
141 | if (err) |
142 | return err; | |
8bc22961 | 143 | err = device_create_file(&vol->dev, &attr_vol_corrupted); |
801c135c AB |
144 | if (err) |
145 | return err; | |
8bc22961 | 146 | err = device_create_file(&vol->dev, &attr_vol_alignment); |
801c135c AB |
147 | if (err) |
148 | return err; | |
8bc22961 | 149 | err = device_create_file(&vol->dev, &attr_vol_usable_eb_size); |
801c135c AB |
150 | if (err) |
151 | return err; | |
8bc22961 | 152 | err = device_create_file(&vol->dev, &attr_vol_data_bytes); |
801c135c AB |
153 | if (err) |
154 | return err; | |
8bc22961 | 155 | err = device_create_file(&vol->dev, &attr_vol_upd_marker); |
fc75a1e1 | 156 | return err; |
801c135c AB |
157 | } |
158 | ||
159 | /** | |
160 | * volume_sysfs_close - close sysfs for a volume. | |
161 | * @vol: volume description object | |
162 | */ | |
163 | static void volume_sysfs_close(struct ubi_volume *vol) | |
164 | { | |
8bc22961 AB |
165 | device_remove_file(&vol->dev, &attr_vol_upd_marker); |
166 | device_remove_file(&vol->dev, &attr_vol_data_bytes); | |
167 | device_remove_file(&vol->dev, &attr_vol_usable_eb_size); | |
168 | device_remove_file(&vol->dev, &attr_vol_alignment); | |
169 | device_remove_file(&vol->dev, &attr_vol_corrupted); | |
170 | device_remove_file(&vol->dev, &attr_vol_name); | |
171 | device_remove_file(&vol->dev, &attr_vol_type); | |
172 | device_remove_file(&vol->dev, &attr_vol_reserved_ebs); | |
801c135c AB |
173 | device_unregister(&vol->dev); |
174 | } | |
175 | ||
176 | /** | |
177 | * ubi_create_volume - create volume. | |
178 | * @ubi: UBI device description object | |
179 | * @req: volume creation request | |
180 | * | |
181 | * This function creates volume described by @req. If @req->vol_id id | |
182 | * %UBI_VOL_NUM_AUTO, this function automatically assigne ID to the new volume | |
183 | * and saves it in @req->vol_id. Returns zero in case of success and a negative | |
184 | * error code in case of failure. | |
185 | */ | |
186 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
187 | { | |
fc75a1e1 | 188 | int i, err, vol_id = req->vol_id, dont_free = 0; |
801c135c AB |
189 | struct ubi_volume *vol; |
190 | struct ubi_vtbl_record vtbl_rec; | |
191 | uint64_t bytes; | |
49dfc299 | 192 | dev_t dev; |
801c135c AB |
193 | |
194 | if (ubi->ro_mode) | |
195 | return -EROFS; | |
196 | ||
197 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); | |
198 | if (!vol) | |
199 | return -ENOMEM; | |
200 | ||
cae0a771 | 201 | mutex_lock(&ubi->volumes_mutex); |
801c135c | 202 | spin_lock(&ubi->volumes_lock); |
801c135c AB |
203 | if (vol_id == UBI_VOL_NUM_AUTO) { |
204 | /* Find unused volume ID */ | |
205 | dbg_msg("search for vacant volume ID"); | |
206 | for (i = 0; i < ubi->vtbl_slots; i++) | |
207 | if (!ubi->volumes[i]) { | |
208 | vol_id = i; | |
209 | break; | |
210 | } | |
211 | ||
212 | if (vol_id == UBI_VOL_NUM_AUTO) { | |
213 | dbg_err("out of volume IDs"); | |
214 | err = -ENFILE; | |
215 | goto out_unlock; | |
216 | } | |
217 | req->vol_id = vol_id; | |
218 | } | |
219 | ||
220 | dbg_msg("volume ID %d, %llu bytes, type %d, name %s", | |
221 | vol_id, (unsigned long long)req->bytes, | |
222 | (int)req->vol_type, req->name); | |
223 | ||
224 | /* Ensure that this volume does not exist */ | |
225 | err = -EEXIST; | |
226 | if (ubi->volumes[vol_id]) { | |
227 | dbg_err("volume %d already exists", vol_id); | |
228 | goto out_unlock; | |
229 | } | |
230 | ||
231 | /* Ensure that the name is unique */ | |
232 | for (i = 0; i < ubi->vtbl_slots; i++) | |
233 | if (ubi->volumes[i] && | |
234 | ubi->volumes[i]->name_len == req->name_len && | |
94784d91 | 235 | !strcmp(ubi->volumes[i]->name, req->name)) { |
801c135c AB |
236 | dbg_err("volume \"%s\" exists (ID %d)", req->name, i); |
237 | goto out_unlock; | |
238 | } | |
239 | ||
240 | /* Calculate how many eraseblocks are requested */ | |
241 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; | |
242 | bytes = req->bytes; | |
243 | if (do_div(bytes, vol->usable_leb_size)) | |
244 | vol->reserved_pebs = 1; | |
245 | vol->reserved_pebs += bytes; | |
246 | ||
247 | /* Reserve physical eraseblocks */ | |
248 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
249 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); | |
801c135c AB |
250 | err = -ENOSPC; |
251 | goto out_unlock; | |
252 | } | |
253 | ubi->avail_pebs -= vol->reserved_pebs; | |
254 | ubi->rsvd_pebs += vol->reserved_pebs; | |
255 | ||
256 | vol->vol_id = vol_id; | |
257 | vol->alignment = req->alignment; | |
258 | vol->data_pad = ubi->leb_size % vol->alignment; | |
259 | vol->vol_type = req->vol_type; | |
260 | vol->name_len = req->name_len; | |
261 | memcpy(vol->name, req->name, vol->name_len + 1); | |
262 | vol->exclusive = 1; | |
263 | vol->ubi = ubi; | |
264 | ubi->volumes[vol_id] = vol; | |
265 | spin_unlock(&ubi->volumes_lock); | |
266 | ||
267 | /* | |
268 | * Finish all pending erases because there may be some LEBs belonging | |
269 | * to the same volume ID. | |
270 | */ | |
271 | err = ubi_wl_flush(ubi); | |
272 | if (err) | |
273 | goto out_acc; | |
274 | ||
275 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
276 | if (!vol->eba_tbl) { | |
277 | err = -ENOMEM; | |
278 | goto out_acc; | |
279 | } | |
280 | ||
281 | for (i = 0; i < vol->reserved_pebs; i++) | |
282 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
283 | ||
284 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
285 | vol->used_ebs = vol->reserved_pebs; | |
286 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
287 | vol->used_bytes = |
288 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
289 | } else { |
290 | bytes = vol->used_bytes; | |
291 | vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size); | |
292 | vol->used_ebs = bytes; | |
293 | if (vol->last_eb_bytes) | |
294 | vol->used_ebs += 1; | |
295 | else | |
296 | vol->last_eb_bytes = vol->usable_leb_size; | |
297 | } | |
298 | ||
299 | /* Register character device for the volume */ | |
300 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
301 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
302 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
303 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 304 | if (err) { |
01f7b309 | 305 | ubi_err("cannot add character device"); |
801c135c AB |
306 | goto out_mapping; |
307 | } | |
308 | ||
309 | err = ubi_create_gluebi(ubi, vol); | |
310 | if (err) | |
311 | goto out_cdev; | |
312 | ||
313 | vol->dev.release = vol_release; | |
314 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 315 | vol->dev.devt = dev; |
801c135c | 316 | vol->dev.class = ubi_class; |
fc75a1e1 | 317 | |
801c135c AB |
318 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); |
319 | err = device_register(&vol->dev); | |
01f7b309 AB |
320 | if (err) { |
321 | ubi_err("cannot register device"); | |
801c135c | 322 | goto out_gluebi; |
01f7b309 | 323 | } |
801c135c AB |
324 | |
325 | err = volume_sysfs_init(ubi, vol); | |
326 | if (err) | |
327 | goto out_sysfs; | |
328 | ||
329 | /* Fill volume table record */ | |
330 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
3261ebd7 CH |
331 | vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); |
332 | vtbl_rec.alignment = cpu_to_be32(vol->alignment); | |
333 | vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); | |
334 | vtbl_rec.name_len = cpu_to_be16(vol->name_len); | |
801c135c AB |
335 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
336 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
337 | else | |
338 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
339 | memcpy(vtbl_rec.name, vol->name, vol->name_len + 1); | |
340 | ||
341 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
342 | if (err) | |
343 | goto out_sysfs; | |
344 | ||
345 | spin_lock(&ubi->volumes_lock); | |
346 | ubi->vol_count += 1; | |
347 | vol->exclusive = 0; | |
348 | spin_unlock(&ubi->volumes_lock); | |
349 | ||
350 | paranoid_check_volumes(ubi); | |
cae0a771 | 351 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
352 | return 0; |
353 | ||
fc75a1e1 AB |
354 | out_sysfs: |
355 | /* | |
356 | * We have degistered our device, we should not free the volume* | |
357 | * description object in this function in case of an error - it is | |
358 | * freed by the release function. | |
359 | * | |
360 | * Get device reference to prevent the release function from being | |
361 | * called just after sysfs has been closed. | |
362 | */ | |
363 | dont_free = 1; | |
364 | get_device(&vol->dev); | |
365 | volume_sysfs_close(vol); | |
801c135c | 366 | out_gluebi: |
fc75a1e1 | 367 | ubi_destroy_gluebi(vol); |
801c135c AB |
368 | out_cdev: |
369 | cdev_del(&vol->cdev); | |
370 | out_mapping: | |
371 | kfree(vol->eba_tbl); | |
372 | out_acc: | |
373 | spin_lock(&ubi->volumes_lock); | |
374 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
375 | ubi->avail_pebs += vol->reserved_pebs; | |
94784d91 | 376 | ubi->volumes[vol_id] = NULL; |
801c135c AB |
377 | out_unlock: |
378 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 379 | mutex_unlock(&ubi->volumes_mutex); |
fc75a1e1 AB |
380 | if (dont_free) |
381 | put_device(&vol->dev); | |
382 | else | |
383 | kfree(vol); | |
01f7b309 | 384 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
385 | return err; |
386 | } | |
387 | ||
388 | /** | |
389 | * ubi_remove_volume - remove volume. | |
390 | * @desc: volume descriptor | |
391 | * | |
392 | * This function removes volume described by @desc. The volume has to be opened | |
393 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
394 | * code in case of failure. | |
395 | */ | |
396 | int ubi_remove_volume(struct ubi_volume_desc *desc) | |
397 | { | |
398 | struct ubi_volume *vol = desc->vol; | |
399 | struct ubi_device *ubi = vol->ubi; | |
400 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
401 | ||
402 | dbg_msg("remove UBI volume %d", vol_id); | |
403 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
404 | ubi_assert(vol == ubi->volumes[vol_id]); | |
405 | ||
406 | if (ubi->ro_mode) | |
407 | return -EROFS; | |
408 | ||
cae0a771 | 409 | mutex_lock(&ubi->volumes_mutex); |
801c135c AB |
410 | err = ubi_destroy_gluebi(vol); |
411 | if (err) | |
cae0a771 | 412 | goto out; |
801c135c AB |
413 | |
414 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
415 | if (err) | |
cae0a771 | 416 | goto out; |
801c135c AB |
417 | |
418 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 419 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 420 | if (err) |
cae0a771 | 421 | goto out; |
801c135c AB |
422 | } |
423 | ||
424 | spin_lock(&ubi->volumes_lock); | |
425 | vol->removed = 1; | |
426 | ubi->volumes[vol_id] = NULL; | |
427 | spin_unlock(&ubi->volumes_lock); | |
428 | ||
429 | kfree(vol->eba_tbl); | |
430 | vol->eba_tbl = NULL; | |
431 | cdev_del(&vol->cdev); | |
432 | volume_sysfs_close(vol); | |
801c135c AB |
433 | |
434 | spin_lock(&ubi->volumes_lock); | |
435 | ubi->rsvd_pebs -= reserved_pebs; | |
436 | ubi->avail_pebs += reserved_pebs; | |
437 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
438 | if (i > 0) { | |
439 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; | |
440 | ubi->avail_pebs -= i; | |
441 | ubi->rsvd_pebs += i; | |
442 | ubi->beb_rsvd_pebs += i; | |
443 | if (i > 0) | |
444 | ubi_msg("reserve more %d PEBs", i); | |
445 | } | |
446 | ubi->vol_count -= 1; | |
447 | spin_unlock(&ubi->volumes_lock); | |
448 | ||
449 | paranoid_check_volumes(ubi); | |
cae0a771 AB |
450 | out: |
451 | mutex_unlock(&ubi->volumes_mutex); | |
452 | return err; | |
801c135c AB |
453 | } |
454 | ||
455 | /** | |
456 | * ubi_resize_volume - re-size volume. | |
457 | * @desc: volume descriptor | |
458 | * @reserved_pebs: new size in physical eraseblocks | |
459 | * | |
460 | * This function returns zero in case of success, and a negative error code in | |
461 | * case of failure. | |
462 | */ | |
463 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
464 | { | |
465 | int i, err, pebs, *new_mapping; | |
466 | struct ubi_volume *vol = desc->vol; | |
467 | struct ubi_device *ubi = vol->ubi; | |
468 | struct ubi_vtbl_record vtbl_rec; | |
469 | int vol_id = vol->vol_id; | |
470 | ||
471 | if (ubi->ro_mode) | |
472 | return -EROFS; | |
473 | ||
474 | dbg_msg("re-size volume %d to from %d to %d PEBs", | |
475 | vol_id, vol->reserved_pebs, reserved_pebs); | |
476 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
477 | ubi_assert(vol == ubi->volumes[vol_id]); | |
478 | ||
479 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
480 | reserved_pebs < vol->used_ebs) { | |
481 | dbg_err("too small size %d, %d LEBs contain data", | |
482 | reserved_pebs, vol->used_ebs); | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
486 | /* If the size is the same, we have nothing to do */ | |
487 | if (reserved_pebs == vol->reserved_pebs) | |
488 | return 0; | |
489 | ||
490 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
491 | if (!new_mapping) | |
492 | return -ENOMEM; | |
493 | ||
494 | for (i = 0; i < reserved_pebs; i++) | |
495 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
496 | ||
497 | /* Reserve physical eraseblocks */ | |
cae0a771 | 498 | mutex_lock(&ubi->volumes_mutex); |
801c135c AB |
499 | pebs = reserved_pebs - vol->reserved_pebs; |
500 | if (pebs > 0) { | |
501 | spin_lock(&ubi->volumes_lock); | |
502 | if (pebs > ubi->avail_pebs) { | |
503 | dbg_err("not enough PEBs: requested %d, available %d", | |
504 | pebs, ubi->avail_pebs); | |
505 | spin_unlock(&ubi->volumes_lock); | |
506 | err = -ENOSPC; | |
507 | goto out_free; | |
508 | } | |
509 | ubi->avail_pebs -= pebs; | |
510 | ubi->rsvd_pebs += pebs; | |
511 | for (i = 0; i < vol->reserved_pebs; i++) | |
512 | new_mapping[i] = vol->eba_tbl[i]; | |
513 | kfree(vol->eba_tbl); | |
514 | vol->eba_tbl = new_mapping; | |
515 | spin_unlock(&ubi->volumes_lock); | |
516 | } | |
517 | ||
518 | /* Change volume table record */ | |
519 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); | |
3261ebd7 | 520 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); |
801c135c AB |
521 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
522 | if (err) | |
523 | goto out_acc; | |
524 | ||
525 | if (pebs < 0) { | |
526 | for (i = 0; i < -pebs; i++) { | |
89b96b69 | 527 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
528 | if (err) |
529 | goto out_acc; | |
530 | } | |
531 | spin_lock(&ubi->volumes_lock); | |
532 | ubi->rsvd_pebs += pebs; | |
533 | ubi->avail_pebs -= pebs; | |
534 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
535 | if (pebs > 0) { | |
536 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; | |
537 | ubi->avail_pebs -= pebs; | |
538 | ubi->rsvd_pebs += pebs; | |
539 | ubi->beb_rsvd_pebs += pebs; | |
540 | if (pebs > 0) | |
541 | ubi_msg("reserve more %d PEBs", pebs); | |
542 | } | |
543 | for (i = 0; i < 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 | vol->reserved_pebs = reserved_pebs; | |
551 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
552 | vol->used_ebs = reserved_pebs; | |
553 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
554 | vol->used_bytes = |
555 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
556 | } |
557 | ||
558 | paranoid_check_volumes(ubi); | |
cae0a771 | 559 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
560 | return 0; |
561 | ||
562 | out_acc: | |
563 | if (pebs > 0) { | |
564 | spin_lock(&ubi->volumes_lock); | |
565 | ubi->rsvd_pebs -= pebs; | |
566 | ubi->avail_pebs += pebs; | |
567 | spin_unlock(&ubi->volumes_lock); | |
568 | } | |
569 | out_free: | |
570 | kfree(new_mapping); | |
cae0a771 | 571 | mutex_unlock(&ubi->volumes_mutex); |
801c135c AB |
572 | return err; |
573 | } | |
574 | ||
575 | /** | |
576 | * ubi_add_volume - add volume. | |
577 | * @ubi: UBI device description object | |
89b96b69 | 578 | * @vol: volume description object |
801c135c AB |
579 | * |
580 | * This function adds an existin volume and initializes all its data | |
581 | * structures. Returnes zero in case of success and a negative error code in | |
582 | * case of failure. | |
583 | */ | |
89b96b69 | 584 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 585 | { |
89b96b69 | 586 | int err, vol_id = vol->vol_id; |
49dfc299 | 587 | dev_t dev; |
801c135c AB |
588 | |
589 | dbg_msg("add volume %d", vol_id); | |
590 | ubi_dbg_dump_vol_info(vol); | |
591 | ubi_assert(vol); | |
592 | ||
593 | /* Register character device for the volume */ | |
594 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
595 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
596 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
597 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 598 | if (err) { |
01f7b309 AB |
599 | ubi_err("cannot add character device for volume %d, error %d", |
600 | vol_id, err); | |
801c135c AB |
601 | return err; |
602 | } | |
603 | ||
604 | err = ubi_create_gluebi(ubi, vol); | |
605 | if (err) | |
606 | goto out_cdev; | |
607 | ||
608 | vol->dev.release = vol_release; | |
609 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 610 | vol->dev.devt = dev; |
801c135c AB |
611 | vol->dev.class = ubi_class; |
612 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); | |
613 | err = device_register(&vol->dev); | |
614 | if (err) | |
615 | goto out_gluebi; | |
616 | ||
617 | err = volume_sysfs_init(ubi, vol); | |
618 | if (err) { | |
619 | cdev_del(&vol->cdev); | |
620 | err = ubi_destroy_gluebi(vol); | |
621 | volume_sysfs_close(vol); | |
622 | return err; | |
623 | } | |
624 | ||
625 | paranoid_check_volumes(ubi); | |
626 | return 0; | |
627 | ||
628 | out_gluebi: | |
629 | err = ubi_destroy_gluebi(vol); | |
630 | out_cdev: | |
631 | cdev_del(&vol->cdev); | |
632 | return err; | |
633 | } | |
634 | ||
635 | /** | |
636 | * ubi_free_volume - free volume. | |
637 | * @ubi: UBI device description object | |
89b96b69 | 638 | * @vol: volume description object |
801c135c | 639 | * |
89b96b69 | 640 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
641 | * Used only when the UBI device is detached. |
642 | */ | |
89b96b69 | 643 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c AB |
644 | { |
645 | int err; | |
801c135c | 646 | |
89b96b69 | 647 | dbg_msg("free volume %d", vol->vol_id); |
801c135c AB |
648 | ubi_assert(vol); |
649 | ||
650 | vol->removed = 1; | |
651 | err = ubi_destroy_gluebi(vol); | |
89b96b69 | 652 | ubi->volumes[vol->vol_id] = NULL; |
801c135c AB |
653 | cdev_del(&vol->cdev); |
654 | volume_sysfs_close(vol); | |
655 | } | |
656 | ||
657 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
658 | ||
659 | /** | |
660 | * paranoid_check_volume - check volume information. | |
661 | * @ubi: UBI device description object | |
662 | * @vol_id: volume ID | |
663 | */ | |
b89044bf | 664 | static void paranoid_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
665 | { |
666 | int idx = vol_id2idx(ubi, vol_id); | |
667 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 668 | const struct ubi_volume *vol; |
801c135c AB |
669 | long long n; |
670 | const char *name; | |
671 | ||
b89044bf | 672 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 673 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 674 | vol = ubi->volumes[idx]; |
801c135c AB |
675 | |
676 | if (!vol) { | |
677 | if (reserved_pebs) { | |
678 | ubi_err("no volume info, but volume exists"); | |
679 | goto fail; | |
680 | } | |
b89044bf AB |
681 | spin_unlock(&ubi->volumes_lock); |
682 | return; | |
683 | } | |
684 | ||
685 | if (vol->exclusive) { | |
686 | /* | |
687 | * The volume may be being created at the moment, do not check | |
688 | * it (e.g., it may be in the middle of ubi_create_volume(). | |
689 | */ | |
690 | spin_unlock(&ubi->volumes_lock); | |
801c135c AB |
691 | return; |
692 | } | |
693 | ||
694 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
695 | vol->name_len < 0) { | |
696 | ubi_err("negative values"); | |
697 | goto fail; | |
698 | } | |
699 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
700 | ubi_err("bad alignment"); | |
701 | goto fail; | |
702 | } | |
703 | ||
704 | n = vol->alignment % ubi->min_io_size; | |
705 | if (vol->alignment != 1 && n) { | |
706 | ubi_err("alignment is not multiple of min I/O unit"); | |
707 | goto fail; | |
708 | } | |
709 | ||
710 | n = ubi->leb_size % vol->alignment; | |
711 | if (vol->data_pad != n) { | |
712 | ubi_err("bad data_pad, has to be %lld", n); | |
713 | goto fail; | |
714 | } | |
715 | ||
716 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
717 | vol->vol_type != UBI_STATIC_VOLUME) { | |
718 | ubi_err("bad vol_type"); | |
719 | goto fail; | |
720 | } | |
721 | ||
722 | if (vol->upd_marker != 0 && vol->upd_marker != 1) { | |
723 | ubi_err("bad upd_marker"); | |
724 | goto fail; | |
725 | } | |
726 | ||
727 | if (vol->upd_marker && vol->corrupted) { | |
728 | dbg_err("update marker and corrupted simultaneously"); | |
729 | goto fail; | |
730 | } | |
731 | ||
732 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
733 | ubi_err("too large reserved_pebs"); | |
734 | goto fail; | |
735 | } | |
736 | ||
737 | n = ubi->leb_size - vol->data_pad; | |
738 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
739 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
740 | goto fail; | |
741 | } | |
742 | ||
743 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
744 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
745 | goto fail; | |
746 | } | |
747 | ||
748 | if (!vol->name) { | |
749 | ubi_err("NULL volume name"); | |
750 | goto fail; | |
751 | } | |
752 | ||
753 | n = strnlen(vol->name, vol->name_len + 1); | |
754 | if (n != vol->name_len) { | |
755 | ubi_err("bad name_len %lld", n); | |
756 | goto fail; | |
757 | } | |
758 | ||
d08c3b78 | 759 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c AB |
760 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
761 | if (vol->corrupted != 0) { | |
762 | ubi_err("corrupted dynamic volume"); | |
763 | goto fail; | |
764 | } | |
765 | if (vol->used_ebs != vol->reserved_pebs) { | |
766 | ubi_err("bad used_ebs"); | |
767 | goto fail; | |
768 | } | |
769 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
770 | ubi_err("bad last_eb_bytes"); | |
771 | goto fail; | |
772 | } | |
773 | if (vol->used_bytes != n) { | |
774 | ubi_err("bad used_bytes"); | |
775 | goto fail; | |
776 | } | |
777 | } else { | |
778 | if (vol->corrupted != 0 && vol->corrupted != 1) { | |
779 | ubi_err("bad corrupted"); | |
780 | goto fail; | |
781 | } | |
782 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { | |
783 | ubi_err("bad used_ebs"); | |
784 | goto fail; | |
785 | } | |
786 | if (vol->last_eb_bytes < 0 || | |
787 | vol->last_eb_bytes > vol->usable_leb_size) { | |
788 | ubi_err("bad last_eb_bytes"); | |
789 | goto fail; | |
790 | } | |
791 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
792 | vol->used_bytes < n - vol->usable_leb_size) { | |
793 | ubi_err("bad used_bytes"); | |
794 | goto fail; | |
795 | } | |
796 | } | |
797 | ||
3261ebd7 CH |
798 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
799 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
800 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); | |
801c135c AB |
801 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
802 | name = &ubi->vtbl[vol_id].name[0]; | |
803 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
804 | vol_type = UBI_DYNAMIC_VOLUME; | |
805 | else | |
806 | vol_type = UBI_STATIC_VOLUME; | |
807 | ||
808 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
809 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
810 | name_len!= vol->name_len || strncmp(name, vol->name, name_len)) { | |
811 | ubi_err("volume info is different"); | |
812 | goto fail; | |
813 | } | |
814 | ||
b89044bf | 815 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
816 | return; |
817 | ||
818 | fail: | |
94784d91 | 819 | ubi_err("paranoid check failed for volume %d", vol_id); |
801c135c AB |
820 | ubi_dbg_dump_vol_info(vol); |
821 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); | |
b89044bf | 822 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
823 | BUG(); |
824 | } | |
825 | ||
826 | /** | |
827 | * paranoid_check_volumes - check information about all volumes. | |
828 | * @ubi: UBI device description object | |
829 | */ | |
830 | static void paranoid_check_volumes(struct ubi_device *ubi) | |
831 | { | |
832 | int i; | |
833 | ||
801c135c AB |
834 | for (i = 0; i < ubi->vtbl_slots; i++) |
835 | paranoid_check_volume(ubi, i); | |
801c135c AB |
836 | } |
837 | #endif |