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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' */ | |
40 | static struct device_attribute vol_reserved_ebs = | |
41 | __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); | |
42 | static struct device_attribute vol_type = | |
43 | __ATTR(type, S_IRUGO, vol_attribute_show, NULL); | |
44 | static struct device_attribute vol_name = | |
45 | __ATTR(name, S_IRUGO, vol_attribute_show, NULL); | |
46 | static struct device_attribute vol_corrupted = | |
47 | __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); | |
48 | static struct device_attribute vol_alignment = | |
49 | __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); | |
50 | static struct device_attribute vol_usable_eb_size = | |
51 | __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); | |
52 | static struct device_attribute vol_data_bytes = | |
53 | __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); | |
54 | static struct device_attribute vol_upd_marker = | |
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 | { | |
73 | int ret; | |
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); | |
79 | return -ENODEV; | |
80 | } | |
81 | if (attr == &vol_reserved_ebs) | |
82 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); | |
83 | else if (attr == &vol_type) { | |
84 | const char *tp; | |
85 | tp = vol->vol_type == UBI_DYNAMIC_VOLUME ? "dynamic" : "static"; | |
86 | ret = sprintf(buf, "%s\n", tp); | |
87 | } else if (attr == &vol_name) | |
88 | ret = sprintf(buf, "%s\n", vol->name); | |
89 | else if (attr == &vol_corrupted) | |
90 | ret = sprintf(buf, "%d\n", vol->corrupted); | |
91 | else if (attr == &vol_alignment) | |
92 | ret = sprintf(buf, "%d\n", vol->alignment); | |
93 | else if (attr == &vol_usable_eb_size) { | |
94 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); | |
95 | } else if (attr == &vol_data_bytes) | |
96 | ret = sprintf(buf, "%lld\n", vol->used_bytes); | |
97 | else if (attr == &vol_upd_marker) | |
98 | ret = sprintf(buf, "%d\n", vol->upd_marker); | |
99 | else | |
100 | BUG(); | |
101 | spin_unlock(&vol->ubi->volumes_lock); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | /* Release method for volume devices */ | |
106 | static void vol_release(struct device *dev) | |
107 | { | |
108 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); | |
109 | ubi_assert(vol->removed); | |
110 | kfree(vol); | |
111 | } | |
112 | ||
113 | /** | |
114 | * volume_sysfs_init - initialize sysfs for new volume. | |
115 | * @ubi: UBI device description object | |
116 | * @vol: volume description object | |
117 | * | |
118 | * This function returns zero in case of success and a negative error code in | |
119 | * case of failure. | |
120 | * | |
121 | * Note, this function does not free allocated resources in case of failure - | |
122 | * the caller does it. This is because this would cause release() here and the | |
123 | * caller would oops. | |
124 | */ | |
125 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) | |
126 | { | |
127 | int err; | |
128 | ||
129 | err = device_create_file(&vol->dev, &vol_reserved_ebs); | |
130 | if (err) | |
131 | return err; | |
132 | err = device_create_file(&vol->dev, &vol_type); | |
133 | if (err) | |
134 | return err; | |
135 | err = device_create_file(&vol->dev, &vol_name); | |
136 | if (err) | |
137 | return err; | |
138 | err = device_create_file(&vol->dev, &vol_corrupted); | |
139 | if (err) | |
140 | return err; | |
141 | err = device_create_file(&vol->dev, &vol_alignment); | |
142 | if (err) | |
143 | return err; | |
144 | err = device_create_file(&vol->dev, &vol_usable_eb_size); | |
145 | if (err) | |
146 | return err; | |
147 | err = device_create_file(&vol->dev, &vol_data_bytes); | |
148 | if (err) | |
149 | return err; | |
150 | err = device_create_file(&vol->dev, &vol_upd_marker); | |
151 | if (err) | |
152 | return err; | |
153 | return 0; | |
154 | } | |
155 | ||
156 | /** | |
157 | * volume_sysfs_close - close sysfs for a volume. | |
158 | * @vol: volume description object | |
159 | */ | |
160 | static void volume_sysfs_close(struct ubi_volume *vol) | |
161 | { | |
162 | device_remove_file(&vol->dev, &vol_upd_marker); | |
163 | device_remove_file(&vol->dev, &vol_data_bytes); | |
164 | device_remove_file(&vol->dev, &vol_usable_eb_size); | |
165 | device_remove_file(&vol->dev, &vol_alignment); | |
166 | device_remove_file(&vol->dev, &vol_corrupted); | |
167 | device_remove_file(&vol->dev, &vol_name); | |
168 | device_remove_file(&vol->dev, &vol_type); | |
169 | device_remove_file(&vol->dev, &vol_reserved_ebs); | |
170 | device_unregister(&vol->dev); | |
171 | } | |
172 | ||
173 | /** | |
174 | * ubi_create_volume - create volume. | |
175 | * @ubi: UBI device description object | |
176 | * @req: volume creation request | |
177 | * | |
178 | * This function creates volume described by @req. If @req->vol_id id | |
179 | * %UBI_VOL_NUM_AUTO, this function automatically assigne ID to the new volume | |
180 | * and saves it in @req->vol_id. Returns zero in case of success and a negative | |
181 | * error code in case of failure. | |
182 | */ | |
183 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
184 | { | |
185 | int i, err, vol_id = req->vol_id; | |
186 | struct ubi_volume *vol; | |
187 | struct ubi_vtbl_record vtbl_rec; | |
188 | uint64_t bytes; | |
189 | ||
190 | if (ubi->ro_mode) | |
191 | return -EROFS; | |
192 | ||
193 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); | |
194 | if (!vol) | |
195 | return -ENOMEM; | |
196 | ||
197 | spin_lock(&ubi->volumes_lock); | |
198 | ||
199 | if (vol_id == UBI_VOL_NUM_AUTO) { | |
200 | /* Find unused volume ID */ | |
201 | dbg_msg("search for vacant volume ID"); | |
202 | for (i = 0; i < ubi->vtbl_slots; i++) | |
203 | if (!ubi->volumes[i]) { | |
204 | vol_id = i; | |
205 | break; | |
206 | } | |
207 | ||
208 | if (vol_id == UBI_VOL_NUM_AUTO) { | |
209 | dbg_err("out of volume IDs"); | |
210 | err = -ENFILE; | |
211 | goto out_unlock; | |
212 | } | |
213 | req->vol_id = vol_id; | |
214 | } | |
215 | ||
216 | dbg_msg("volume ID %d, %llu bytes, type %d, name %s", | |
217 | vol_id, (unsigned long long)req->bytes, | |
218 | (int)req->vol_type, req->name); | |
219 | ||
220 | /* Ensure that this volume does not exist */ | |
221 | err = -EEXIST; | |
222 | if (ubi->volumes[vol_id]) { | |
223 | dbg_err("volume %d already exists", vol_id); | |
224 | goto out_unlock; | |
225 | } | |
226 | ||
227 | /* Ensure that the name is unique */ | |
228 | for (i = 0; i < ubi->vtbl_slots; i++) | |
229 | if (ubi->volumes[i] && | |
230 | ubi->volumes[i]->name_len == req->name_len && | |
231 | strcmp(ubi->volumes[i]->name, req->name) == 0) { | |
232 | dbg_err("volume \"%s\" exists (ID %d)", req->name, i); | |
233 | goto out_unlock; | |
234 | } | |
235 | ||
236 | /* Calculate how many eraseblocks are requested */ | |
237 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; | |
238 | bytes = req->bytes; | |
239 | if (do_div(bytes, vol->usable_leb_size)) | |
240 | vol->reserved_pebs = 1; | |
241 | vol->reserved_pebs += bytes; | |
242 | ||
243 | /* Reserve physical eraseblocks */ | |
244 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
245 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); | |
801c135c AB |
246 | err = -ENOSPC; |
247 | goto out_unlock; | |
248 | } | |
249 | ubi->avail_pebs -= vol->reserved_pebs; | |
250 | ubi->rsvd_pebs += vol->reserved_pebs; | |
251 | ||
252 | vol->vol_id = vol_id; | |
253 | vol->alignment = req->alignment; | |
254 | vol->data_pad = ubi->leb_size % vol->alignment; | |
255 | vol->vol_type = req->vol_type; | |
256 | vol->name_len = req->name_len; | |
257 | memcpy(vol->name, req->name, vol->name_len + 1); | |
258 | vol->exclusive = 1; | |
259 | vol->ubi = ubi; | |
260 | ubi->volumes[vol_id] = vol; | |
261 | spin_unlock(&ubi->volumes_lock); | |
262 | ||
263 | /* | |
264 | * Finish all pending erases because there may be some LEBs belonging | |
265 | * to the same volume ID. | |
266 | */ | |
267 | err = ubi_wl_flush(ubi); | |
268 | if (err) | |
269 | goto out_acc; | |
270 | ||
271 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
272 | if (!vol->eba_tbl) { | |
273 | err = -ENOMEM; | |
274 | goto out_acc; | |
275 | } | |
276 | ||
277 | for (i = 0; i < vol->reserved_pebs; i++) | |
278 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
279 | ||
280 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
281 | vol->used_ebs = vol->reserved_pebs; | |
282 | vol->last_eb_bytes = vol->usable_leb_size; | |
283 | vol->used_bytes = vol->used_ebs * vol->usable_leb_size; | |
284 | } else { | |
285 | bytes = vol->used_bytes; | |
286 | vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size); | |
287 | vol->used_ebs = bytes; | |
288 | if (vol->last_eb_bytes) | |
289 | vol->used_ebs += 1; | |
290 | else | |
291 | vol->last_eb_bytes = vol->usable_leb_size; | |
292 | } | |
293 | ||
294 | /* Register character device for the volume */ | |
295 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
296 | vol->cdev.owner = THIS_MODULE; | |
297 | err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol_id + 1), 1); | |
298 | if (err) { | |
299 | ubi_err("cannot add character device for volume %d", vol_id); | |
300 | goto out_mapping; | |
301 | } | |
302 | ||
303 | err = ubi_create_gluebi(ubi, vol); | |
304 | if (err) | |
305 | goto out_cdev; | |
306 | ||
307 | vol->dev.release = vol_release; | |
308 | vol->dev.parent = &ubi->dev; | |
309 | vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1); | |
310 | vol->dev.class = ubi_class; | |
311 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); | |
312 | err = device_register(&vol->dev); | |
313 | if (err) | |
314 | goto out_gluebi; | |
315 | ||
316 | err = volume_sysfs_init(ubi, vol); | |
317 | if (err) | |
318 | goto out_sysfs; | |
319 | ||
320 | /* Fill volume table record */ | |
321 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
322 | vtbl_rec.reserved_pebs = cpu_to_ubi32(vol->reserved_pebs); | |
323 | vtbl_rec.alignment = cpu_to_ubi32(vol->alignment); | |
324 | vtbl_rec.data_pad = cpu_to_ubi32(vol->data_pad); | |
325 | vtbl_rec.name_len = cpu_to_ubi16(vol->name_len); | |
326 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
327 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
328 | else | |
329 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
330 | memcpy(vtbl_rec.name, vol->name, vol->name_len + 1); | |
331 | ||
332 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
333 | if (err) | |
334 | goto out_sysfs; | |
335 | ||
336 | spin_lock(&ubi->volumes_lock); | |
337 | ubi->vol_count += 1; | |
338 | vol->exclusive = 0; | |
339 | spin_unlock(&ubi->volumes_lock); | |
340 | ||
341 | paranoid_check_volumes(ubi); | |
342 | return 0; | |
343 | ||
344 | out_gluebi: | |
345 | err = ubi_destroy_gluebi(vol); | |
346 | out_cdev: | |
347 | cdev_del(&vol->cdev); | |
348 | out_mapping: | |
349 | kfree(vol->eba_tbl); | |
350 | out_acc: | |
351 | spin_lock(&ubi->volumes_lock); | |
352 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
353 | ubi->avail_pebs += vol->reserved_pebs; | |
354 | out_unlock: | |
355 | spin_unlock(&ubi->volumes_lock); | |
356 | kfree(vol); | |
357 | return err; | |
358 | ||
359 | /* | |
360 | * We are registered, so @vol is destroyed in the release function and | |
361 | * we have to de-initialize differently. | |
362 | */ | |
363 | out_sysfs: | |
364 | err = ubi_destroy_gluebi(vol); | |
365 | cdev_del(&vol->cdev); | |
366 | kfree(vol->eba_tbl); | |
367 | spin_lock(&ubi->volumes_lock); | |
368 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
369 | ubi->avail_pebs += vol->reserved_pebs; | |
370 | spin_unlock(&ubi->volumes_lock); | |
371 | volume_sysfs_close(vol); | |
372 | return err; | |
373 | } | |
374 | ||
375 | /** | |
376 | * ubi_remove_volume - remove volume. | |
377 | * @desc: volume descriptor | |
378 | * | |
379 | * This function removes volume described by @desc. The volume has to be opened | |
380 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
381 | * code in case of failure. | |
382 | */ | |
383 | int ubi_remove_volume(struct ubi_volume_desc *desc) | |
384 | { | |
385 | struct ubi_volume *vol = desc->vol; | |
386 | struct ubi_device *ubi = vol->ubi; | |
387 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
388 | ||
389 | dbg_msg("remove UBI volume %d", vol_id); | |
390 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
391 | ubi_assert(vol == ubi->volumes[vol_id]); | |
392 | ||
393 | if (ubi->ro_mode) | |
394 | return -EROFS; | |
395 | ||
396 | err = ubi_destroy_gluebi(vol); | |
397 | if (err) | |
398 | return err; | |
399 | ||
400 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
401 | if (err) | |
402 | return err; | |
403 | ||
404 | for (i = 0; i < vol->reserved_pebs; i++) { | |
405 | err = ubi_eba_unmap_leb(ubi, vol_id, i); | |
406 | if (err) | |
407 | return err; | |
408 | } | |
409 | ||
410 | spin_lock(&ubi->volumes_lock); | |
411 | vol->removed = 1; | |
412 | ubi->volumes[vol_id] = NULL; | |
413 | spin_unlock(&ubi->volumes_lock); | |
414 | ||
415 | kfree(vol->eba_tbl); | |
416 | vol->eba_tbl = NULL; | |
417 | cdev_del(&vol->cdev); | |
418 | volume_sysfs_close(vol); | |
419 | kfree(desc); | |
420 | ||
421 | spin_lock(&ubi->volumes_lock); | |
422 | ubi->rsvd_pebs -= reserved_pebs; | |
423 | ubi->avail_pebs += reserved_pebs; | |
424 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
425 | if (i > 0) { | |
426 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; | |
427 | ubi->avail_pebs -= i; | |
428 | ubi->rsvd_pebs += i; | |
429 | ubi->beb_rsvd_pebs += i; | |
430 | if (i > 0) | |
431 | ubi_msg("reserve more %d PEBs", i); | |
432 | } | |
433 | ubi->vol_count -= 1; | |
434 | spin_unlock(&ubi->volumes_lock); | |
435 | ||
436 | paranoid_check_volumes(ubi); | |
437 | module_put(THIS_MODULE); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | /** | |
442 | * ubi_resize_volume - re-size volume. | |
443 | * @desc: volume descriptor | |
444 | * @reserved_pebs: new size in physical eraseblocks | |
445 | * | |
446 | * This function returns zero in case of success, and a negative error code in | |
447 | * case of failure. | |
448 | */ | |
449 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
450 | { | |
451 | int i, err, pebs, *new_mapping; | |
452 | struct ubi_volume *vol = desc->vol; | |
453 | struct ubi_device *ubi = vol->ubi; | |
454 | struct ubi_vtbl_record vtbl_rec; | |
455 | int vol_id = vol->vol_id; | |
456 | ||
457 | if (ubi->ro_mode) | |
458 | return -EROFS; | |
459 | ||
460 | dbg_msg("re-size volume %d to from %d to %d PEBs", | |
461 | vol_id, vol->reserved_pebs, reserved_pebs); | |
462 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
463 | ubi_assert(vol == ubi->volumes[vol_id]); | |
464 | ||
465 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
466 | reserved_pebs < vol->used_ebs) { | |
467 | dbg_err("too small size %d, %d LEBs contain data", | |
468 | reserved_pebs, vol->used_ebs); | |
469 | return -EINVAL; | |
470 | } | |
471 | ||
472 | /* If the size is the same, we have nothing to do */ | |
473 | if (reserved_pebs == vol->reserved_pebs) | |
474 | return 0; | |
475 | ||
476 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
477 | if (!new_mapping) | |
478 | return -ENOMEM; | |
479 | ||
480 | for (i = 0; i < reserved_pebs; i++) | |
481 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
482 | ||
483 | /* Reserve physical eraseblocks */ | |
484 | pebs = reserved_pebs - vol->reserved_pebs; | |
485 | if (pebs > 0) { | |
486 | spin_lock(&ubi->volumes_lock); | |
487 | if (pebs > ubi->avail_pebs) { | |
488 | dbg_err("not enough PEBs: requested %d, available %d", | |
489 | pebs, ubi->avail_pebs); | |
490 | spin_unlock(&ubi->volumes_lock); | |
491 | err = -ENOSPC; | |
492 | goto out_free; | |
493 | } | |
494 | ubi->avail_pebs -= pebs; | |
495 | ubi->rsvd_pebs += pebs; | |
496 | for (i = 0; i < vol->reserved_pebs; i++) | |
497 | new_mapping[i] = vol->eba_tbl[i]; | |
498 | kfree(vol->eba_tbl); | |
499 | vol->eba_tbl = new_mapping; | |
500 | spin_unlock(&ubi->volumes_lock); | |
501 | } | |
502 | ||
503 | /* Change volume table record */ | |
504 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); | |
505 | vtbl_rec.reserved_pebs = cpu_to_ubi32(reserved_pebs); | |
506 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
507 | if (err) | |
508 | goto out_acc; | |
509 | ||
510 | if (pebs < 0) { | |
511 | for (i = 0; i < -pebs; i++) { | |
512 | err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i); | |
513 | if (err) | |
514 | goto out_acc; | |
515 | } | |
516 | spin_lock(&ubi->volumes_lock); | |
517 | ubi->rsvd_pebs += pebs; | |
518 | ubi->avail_pebs -= pebs; | |
519 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
520 | if (pebs > 0) { | |
521 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; | |
522 | ubi->avail_pebs -= pebs; | |
523 | ubi->rsvd_pebs += pebs; | |
524 | ubi->beb_rsvd_pebs += pebs; | |
525 | if (pebs > 0) | |
526 | ubi_msg("reserve more %d PEBs", pebs); | |
527 | } | |
528 | for (i = 0; i < reserved_pebs; i++) | |
529 | new_mapping[i] = vol->eba_tbl[i]; | |
530 | kfree(vol->eba_tbl); | |
531 | vol->eba_tbl = new_mapping; | |
532 | spin_unlock(&ubi->volumes_lock); | |
533 | } | |
534 | ||
535 | vol->reserved_pebs = reserved_pebs; | |
536 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
537 | vol->used_ebs = reserved_pebs; | |
538 | vol->last_eb_bytes = vol->usable_leb_size; | |
539 | vol->used_bytes = vol->used_ebs * vol->usable_leb_size; | |
540 | } | |
541 | ||
542 | paranoid_check_volumes(ubi); | |
543 | return 0; | |
544 | ||
545 | out_acc: | |
546 | if (pebs > 0) { | |
547 | spin_lock(&ubi->volumes_lock); | |
548 | ubi->rsvd_pebs -= pebs; | |
549 | ubi->avail_pebs += pebs; | |
550 | spin_unlock(&ubi->volumes_lock); | |
551 | } | |
552 | out_free: | |
553 | kfree(new_mapping); | |
554 | return err; | |
555 | } | |
556 | ||
557 | /** | |
558 | * ubi_add_volume - add volume. | |
559 | * @ubi: UBI device description object | |
560 | * @vol_id: volume ID | |
561 | * | |
562 | * This function adds an existin volume and initializes all its data | |
563 | * structures. Returnes zero in case of success and a negative error code in | |
564 | * case of failure. | |
565 | */ | |
566 | int ubi_add_volume(struct ubi_device *ubi, int vol_id) | |
567 | { | |
568 | int err; | |
569 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
570 | ||
571 | dbg_msg("add volume %d", vol_id); | |
572 | ubi_dbg_dump_vol_info(vol); | |
573 | ubi_assert(vol); | |
574 | ||
575 | /* Register character device for the volume */ | |
576 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
577 | vol->cdev.owner = THIS_MODULE; | |
578 | err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1); | |
579 | if (err) { | |
580 | ubi_err("cannot add character device for volume %d", vol_id); | |
581 | return err; | |
582 | } | |
583 | ||
584 | err = ubi_create_gluebi(ubi, vol); | |
585 | if (err) | |
586 | goto out_cdev; | |
587 | ||
588 | vol->dev.release = vol_release; | |
589 | vol->dev.parent = &ubi->dev; | |
590 | vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1); | |
591 | vol->dev.class = ubi_class; | |
592 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); | |
593 | err = device_register(&vol->dev); | |
594 | if (err) | |
595 | goto out_gluebi; | |
596 | ||
597 | err = volume_sysfs_init(ubi, vol); | |
598 | if (err) { | |
599 | cdev_del(&vol->cdev); | |
600 | err = ubi_destroy_gluebi(vol); | |
601 | volume_sysfs_close(vol); | |
602 | return err; | |
603 | } | |
604 | ||
605 | paranoid_check_volumes(ubi); | |
606 | return 0; | |
607 | ||
608 | out_gluebi: | |
609 | err = ubi_destroy_gluebi(vol); | |
610 | out_cdev: | |
611 | cdev_del(&vol->cdev); | |
612 | return err; | |
613 | } | |
614 | ||
615 | /** | |
616 | * ubi_free_volume - free volume. | |
617 | * @ubi: UBI device description object | |
618 | * @vol_id: volume ID | |
619 | * | |
620 | * This function frees all resources for volume @vol_id but does not remove it. | |
621 | * Used only when the UBI device is detached. | |
622 | */ | |
623 | void ubi_free_volume(struct ubi_device *ubi, int vol_id) | |
624 | { | |
625 | int err; | |
626 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
627 | ||
628 | dbg_msg("free volume %d", vol_id); | |
629 | ubi_assert(vol); | |
630 | ||
631 | vol->removed = 1; | |
632 | err = ubi_destroy_gluebi(vol); | |
633 | ubi->volumes[vol_id] = NULL; | |
634 | cdev_del(&vol->cdev); | |
635 | volume_sysfs_close(vol); | |
636 | } | |
637 | ||
638 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
639 | ||
640 | /** | |
641 | * paranoid_check_volume - check volume information. | |
642 | * @ubi: UBI device description object | |
643 | * @vol_id: volume ID | |
644 | */ | |
645 | static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id) | |
646 | { | |
647 | int idx = vol_id2idx(ubi, vol_id); | |
648 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
649 | const struct ubi_volume *vol = ubi->volumes[idx]; | |
650 | long long n; | |
651 | const char *name; | |
652 | ||
653 | reserved_pebs = ubi32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); | |
654 | ||
655 | if (!vol) { | |
656 | if (reserved_pebs) { | |
657 | ubi_err("no volume info, but volume exists"); | |
658 | goto fail; | |
659 | } | |
660 | return; | |
661 | } | |
662 | ||
663 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
664 | vol->name_len < 0) { | |
665 | ubi_err("negative values"); | |
666 | goto fail; | |
667 | } | |
668 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
669 | ubi_err("bad alignment"); | |
670 | goto fail; | |
671 | } | |
672 | ||
673 | n = vol->alignment % ubi->min_io_size; | |
674 | if (vol->alignment != 1 && n) { | |
675 | ubi_err("alignment is not multiple of min I/O unit"); | |
676 | goto fail; | |
677 | } | |
678 | ||
679 | n = ubi->leb_size % vol->alignment; | |
680 | if (vol->data_pad != n) { | |
681 | ubi_err("bad data_pad, has to be %lld", n); | |
682 | goto fail; | |
683 | } | |
684 | ||
685 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
686 | vol->vol_type != UBI_STATIC_VOLUME) { | |
687 | ubi_err("bad vol_type"); | |
688 | goto fail; | |
689 | } | |
690 | ||
691 | if (vol->upd_marker != 0 && vol->upd_marker != 1) { | |
692 | ubi_err("bad upd_marker"); | |
693 | goto fail; | |
694 | } | |
695 | ||
696 | if (vol->upd_marker && vol->corrupted) { | |
697 | dbg_err("update marker and corrupted simultaneously"); | |
698 | goto fail; | |
699 | } | |
700 | ||
701 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
702 | ubi_err("too large reserved_pebs"); | |
703 | goto fail; | |
704 | } | |
705 | ||
706 | n = ubi->leb_size - vol->data_pad; | |
707 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
708 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
709 | goto fail; | |
710 | } | |
711 | ||
712 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
713 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
714 | goto fail; | |
715 | } | |
716 | ||
717 | if (!vol->name) { | |
718 | ubi_err("NULL volume name"); | |
719 | goto fail; | |
720 | } | |
721 | ||
722 | n = strnlen(vol->name, vol->name_len + 1); | |
723 | if (n != vol->name_len) { | |
724 | ubi_err("bad name_len %lld", n); | |
725 | goto fail; | |
726 | } | |
727 | ||
728 | n = vol->used_ebs * vol->usable_leb_size; | |
729 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
730 | if (vol->corrupted != 0) { | |
731 | ubi_err("corrupted dynamic volume"); | |
732 | goto fail; | |
733 | } | |
734 | if (vol->used_ebs != vol->reserved_pebs) { | |
735 | ubi_err("bad used_ebs"); | |
736 | goto fail; | |
737 | } | |
738 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
739 | ubi_err("bad last_eb_bytes"); | |
740 | goto fail; | |
741 | } | |
742 | if (vol->used_bytes != n) { | |
743 | ubi_err("bad used_bytes"); | |
744 | goto fail; | |
745 | } | |
746 | } else { | |
747 | if (vol->corrupted != 0 && vol->corrupted != 1) { | |
748 | ubi_err("bad corrupted"); | |
749 | goto fail; | |
750 | } | |
751 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { | |
752 | ubi_err("bad used_ebs"); | |
753 | goto fail; | |
754 | } | |
755 | if (vol->last_eb_bytes < 0 || | |
756 | vol->last_eb_bytes > vol->usable_leb_size) { | |
757 | ubi_err("bad last_eb_bytes"); | |
758 | goto fail; | |
759 | } | |
760 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
761 | vol->used_bytes < n - vol->usable_leb_size) { | |
762 | ubi_err("bad used_bytes"); | |
763 | goto fail; | |
764 | } | |
765 | } | |
766 | ||
767 | alignment = ubi32_to_cpu(ubi->vtbl[vol_id].alignment); | |
768 | data_pad = ubi32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
769 | name_len = ubi16_to_cpu(ubi->vtbl[vol_id].name_len); | |
770 | upd_marker = ubi->vtbl[vol_id].upd_marker; | |
771 | name = &ubi->vtbl[vol_id].name[0]; | |
772 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
773 | vol_type = UBI_DYNAMIC_VOLUME; | |
774 | else | |
775 | vol_type = UBI_STATIC_VOLUME; | |
776 | ||
777 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
778 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
779 | name_len!= vol->name_len || strncmp(name, vol->name, name_len)) { | |
780 | ubi_err("volume info is different"); | |
781 | goto fail; | |
782 | } | |
783 | ||
784 | return; | |
785 | ||
786 | fail: | |
787 | ubi_err("paranoid check failed"); | |
788 | ubi_dbg_dump_vol_info(vol); | |
789 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); | |
790 | BUG(); | |
791 | } | |
792 | ||
793 | /** | |
794 | * paranoid_check_volumes - check information about all volumes. | |
795 | * @ubi: UBI device description object | |
796 | */ | |
797 | static void paranoid_check_volumes(struct ubi_device *ubi) | |
798 | { | |
799 | int i; | |
800 | ||
801 | mutex_lock(&ubi->vtbl_mutex); | |
802 | spin_lock(&ubi->volumes_lock); | |
803 | for (i = 0; i < ubi->vtbl_slots; i++) | |
804 | paranoid_check_volume(ubi, i); | |
805 | spin_unlock(&ubi->volumes_lock); | |
806 | mutex_unlock(&ubi->vtbl_mutex); | |
807 | } | |
808 | #endif |