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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); | |
246 | spin_unlock(&ubi->volumes_lock); | |
247 | err = -ENOSPC; | |
248 | goto out_unlock; | |
249 | } | |
250 | ubi->avail_pebs -= vol->reserved_pebs; | |
251 | ubi->rsvd_pebs += vol->reserved_pebs; | |
252 | ||
253 | vol->vol_id = vol_id; | |
254 | vol->alignment = req->alignment; | |
255 | vol->data_pad = ubi->leb_size % vol->alignment; | |
256 | vol->vol_type = req->vol_type; | |
257 | vol->name_len = req->name_len; | |
258 | memcpy(vol->name, req->name, vol->name_len + 1); | |
259 | vol->exclusive = 1; | |
260 | vol->ubi = ubi; | |
261 | ubi->volumes[vol_id] = vol; | |
262 | spin_unlock(&ubi->volumes_lock); | |
263 | ||
264 | /* | |
265 | * Finish all pending erases because there may be some LEBs belonging | |
266 | * to the same volume ID. | |
267 | */ | |
268 | err = ubi_wl_flush(ubi); | |
269 | if (err) | |
270 | goto out_acc; | |
271 | ||
272 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
273 | if (!vol->eba_tbl) { | |
274 | err = -ENOMEM; | |
275 | goto out_acc; | |
276 | } | |
277 | ||
278 | for (i = 0; i < vol->reserved_pebs; i++) | |
279 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
280 | ||
281 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
282 | vol->used_ebs = vol->reserved_pebs; | |
283 | vol->last_eb_bytes = vol->usable_leb_size; | |
284 | vol->used_bytes = vol->used_ebs * vol->usable_leb_size; | |
285 | } else { | |
286 | bytes = vol->used_bytes; | |
287 | vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size); | |
288 | vol->used_ebs = bytes; | |
289 | if (vol->last_eb_bytes) | |
290 | vol->used_ebs += 1; | |
291 | else | |
292 | vol->last_eb_bytes = vol->usable_leb_size; | |
293 | } | |
294 | ||
295 | /* Register character device for the volume */ | |
296 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
297 | vol->cdev.owner = THIS_MODULE; | |
298 | err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol_id + 1), 1); | |
299 | if (err) { | |
300 | ubi_err("cannot add character device for volume %d", vol_id); | |
301 | goto out_mapping; | |
302 | } | |
303 | ||
304 | err = ubi_create_gluebi(ubi, vol); | |
305 | if (err) | |
306 | goto out_cdev; | |
307 | ||
308 | vol->dev.release = vol_release; | |
309 | vol->dev.parent = &ubi->dev; | |
310 | vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1); | |
311 | vol->dev.class = ubi_class; | |
312 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); | |
313 | err = device_register(&vol->dev); | |
314 | if (err) | |
315 | goto out_gluebi; | |
316 | ||
317 | err = volume_sysfs_init(ubi, vol); | |
318 | if (err) | |
319 | goto out_sysfs; | |
320 | ||
321 | /* Fill volume table record */ | |
322 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
323 | vtbl_rec.reserved_pebs = cpu_to_ubi32(vol->reserved_pebs); | |
324 | vtbl_rec.alignment = cpu_to_ubi32(vol->alignment); | |
325 | vtbl_rec.data_pad = cpu_to_ubi32(vol->data_pad); | |
326 | vtbl_rec.name_len = cpu_to_ubi16(vol->name_len); | |
327 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
328 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
329 | else | |
330 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
331 | memcpy(vtbl_rec.name, vol->name, vol->name_len + 1); | |
332 | ||
333 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
334 | if (err) | |
335 | goto out_sysfs; | |
336 | ||
337 | spin_lock(&ubi->volumes_lock); | |
338 | ubi->vol_count += 1; | |
339 | vol->exclusive = 0; | |
340 | spin_unlock(&ubi->volumes_lock); | |
341 | ||
342 | paranoid_check_volumes(ubi); | |
343 | return 0; | |
344 | ||
345 | out_gluebi: | |
346 | err = ubi_destroy_gluebi(vol); | |
347 | out_cdev: | |
348 | cdev_del(&vol->cdev); | |
349 | out_mapping: | |
350 | kfree(vol->eba_tbl); | |
351 | out_acc: | |
352 | spin_lock(&ubi->volumes_lock); | |
353 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
354 | ubi->avail_pebs += vol->reserved_pebs; | |
355 | out_unlock: | |
356 | spin_unlock(&ubi->volumes_lock); | |
357 | kfree(vol); | |
358 | return err; | |
359 | ||
360 | /* | |
361 | * We are registered, so @vol is destroyed in the release function and | |
362 | * we have to de-initialize differently. | |
363 | */ | |
364 | out_sysfs: | |
365 | err = ubi_destroy_gluebi(vol); | |
366 | cdev_del(&vol->cdev); | |
367 | kfree(vol->eba_tbl); | |
368 | spin_lock(&ubi->volumes_lock); | |
369 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
370 | ubi->avail_pebs += vol->reserved_pebs; | |
371 | spin_unlock(&ubi->volumes_lock); | |
372 | volume_sysfs_close(vol); | |
373 | return err; | |
374 | } | |
375 | ||
376 | /** | |
377 | * ubi_remove_volume - remove volume. | |
378 | * @desc: volume descriptor | |
379 | * | |
380 | * This function removes volume described by @desc. The volume has to be opened | |
381 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
382 | * code in case of failure. | |
383 | */ | |
384 | int ubi_remove_volume(struct ubi_volume_desc *desc) | |
385 | { | |
386 | struct ubi_volume *vol = desc->vol; | |
387 | struct ubi_device *ubi = vol->ubi; | |
388 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
389 | ||
390 | dbg_msg("remove UBI volume %d", vol_id); | |
391 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
392 | ubi_assert(vol == ubi->volumes[vol_id]); | |
393 | ||
394 | if (ubi->ro_mode) | |
395 | return -EROFS; | |
396 | ||
397 | err = ubi_destroy_gluebi(vol); | |
398 | if (err) | |
399 | return err; | |
400 | ||
401 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
402 | if (err) | |
403 | return err; | |
404 | ||
405 | for (i = 0; i < vol->reserved_pebs; i++) { | |
406 | err = ubi_eba_unmap_leb(ubi, vol_id, i); | |
407 | if (err) | |
408 | return err; | |
409 | } | |
410 | ||
411 | spin_lock(&ubi->volumes_lock); | |
412 | vol->removed = 1; | |
413 | ubi->volumes[vol_id] = NULL; | |
414 | spin_unlock(&ubi->volumes_lock); | |
415 | ||
416 | kfree(vol->eba_tbl); | |
417 | vol->eba_tbl = NULL; | |
418 | cdev_del(&vol->cdev); | |
419 | volume_sysfs_close(vol); | |
420 | kfree(desc); | |
421 | ||
422 | spin_lock(&ubi->volumes_lock); | |
423 | ubi->rsvd_pebs -= reserved_pebs; | |
424 | ubi->avail_pebs += reserved_pebs; | |
425 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
426 | if (i > 0) { | |
427 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; | |
428 | ubi->avail_pebs -= i; | |
429 | ubi->rsvd_pebs += i; | |
430 | ubi->beb_rsvd_pebs += i; | |
431 | if (i > 0) | |
432 | ubi_msg("reserve more %d PEBs", i); | |
433 | } | |
434 | ubi->vol_count -= 1; | |
435 | spin_unlock(&ubi->volumes_lock); | |
436 | ||
437 | paranoid_check_volumes(ubi); | |
438 | module_put(THIS_MODULE); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | /** | |
443 | * ubi_resize_volume - re-size volume. | |
444 | * @desc: volume descriptor | |
445 | * @reserved_pebs: new size in physical eraseblocks | |
446 | * | |
447 | * This function returns zero in case of success, and a negative error code in | |
448 | * case of failure. | |
449 | */ | |
450 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
451 | { | |
452 | int i, err, pebs, *new_mapping; | |
453 | struct ubi_volume *vol = desc->vol; | |
454 | struct ubi_device *ubi = vol->ubi; | |
455 | struct ubi_vtbl_record vtbl_rec; | |
456 | int vol_id = vol->vol_id; | |
457 | ||
458 | if (ubi->ro_mode) | |
459 | return -EROFS; | |
460 | ||
461 | dbg_msg("re-size volume %d to from %d to %d PEBs", | |
462 | vol_id, vol->reserved_pebs, reserved_pebs); | |
463 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
464 | ubi_assert(vol == ubi->volumes[vol_id]); | |
465 | ||
466 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
467 | reserved_pebs < vol->used_ebs) { | |
468 | dbg_err("too small size %d, %d LEBs contain data", | |
469 | reserved_pebs, vol->used_ebs); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | /* If the size is the same, we have nothing to do */ | |
474 | if (reserved_pebs == vol->reserved_pebs) | |
475 | return 0; | |
476 | ||
477 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
478 | if (!new_mapping) | |
479 | return -ENOMEM; | |
480 | ||
481 | for (i = 0; i < reserved_pebs; i++) | |
482 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
483 | ||
484 | /* Reserve physical eraseblocks */ | |
485 | pebs = reserved_pebs - vol->reserved_pebs; | |
486 | if (pebs > 0) { | |
487 | spin_lock(&ubi->volumes_lock); | |
488 | if (pebs > ubi->avail_pebs) { | |
489 | dbg_err("not enough PEBs: requested %d, available %d", | |
490 | pebs, ubi->avail_pebs); | |
491 | spin_unlock(&ubi->volumes_lock); | |
492 | err = -ENOSPC; | |
493 | goto out_free; | |
494 | } | |
495 | ubi->avail_pebs -= pebs; | |
496 | ubi->rsvd_pebs += pebs; | |
497 | for (i = 0; i < vol->reserved_pebs; i++) | |
498 | new_mapping[i] = vol->eba_tbl[i]; | |
499 | kfree(vol->eba_tbl); | |
500 | vol->eba_tbl = new_mapping; | |
501 | spin_unlock(&ubi->volumes_lock); | |
502 | } | |
503 | ||
504 | /* Change volume table record */ | |
505 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); | |
506 | vtbl_rec.reserved_pebs = cpu_to_ubi32(reserved_pebs); | |
507 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
508 | if (err) | |
509 | goto out_acc; | |
510 | ||
511 | if (pebs < 0) { | |
512 | for (i = 0; i < -pebs; i++) { | |
513 | err = ubi_eba_unmap_leb(ubi, vol_id, reserved_pebs + i); | |
514 | if (err) | |
515 | goto out_acc; | |
516 | } | |
517 | spin_lock(&ubi->volumes_lock); | |
518 | ubi->rsvd_pebs += pebs; | |
519 | ubi->avail_pebs -= pebs; | |
520 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
521 | if (pebs > 0) { | |
522 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; | |
523 | ubi->avail_pebs -= pebs; | |
524 | ubi->rsvd_pebs += pebs; | |
525 | ubi->beb_rsvd_pebs += pebs; | |
526 | if (pebs > 0) | |
527 | ubi_msg("reserve more %d PEBs", pebs); | |
528 | } | |
529 | for (i = 0; i < reserved_pebs; i++) | |
530 | new_mapping[i] = vol->eba_tbl[i]; | |
531 | kfree(vol->eba_tbl); | |
532 | vol->eba_tbl = new_mapping; | |
533 | spin_unlock(&ubi->volumes_lock); | |
534 | } | |
535 | ||
536 | vol->reserved_pebs = reserved_pebs; | |
537 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
538 | vol->used_ebs = reserved_pebs; | |
539 | vol->last_eb_bytes = vol->usable_leb_size; | |
540 | vol->used_bytes = vol->used_ebs * vol->usable_leb_size; | |
541 | } | |
542 | ||
543 | paranoid_check_volumes(ubi); | |
544 | return 0; | |
545 | ||
546 | out_acc: | |
547 | if (pebs > 0) { | |
548 | spin_lock(&ubi->volumes_lock); | |
549 | ubi->rsvd_pebs -= pebs; | |
550 | ubi->avail_pebs += pebs; | |
551 | spin_unlock(&ubi->volumes_lock); | |
552 | } | |
553 | out_free: | |
554 | kfree(new_mapping); | |
555 | return err; | |
556 | } | |
557 | ||
558 | /** | |
559 | * ubi_add_volume - add volume. | |
560 | * @ubi: UBI device description object | |
561 | * @vol_id: volume ID | |
562 | * | |
563 | * This function adds an existin volume and initializes all its data | |
564 | * structures. Returnes zero in case of success and a negative error code in | |
565 | * case of failure. | |
566 | */ | |
567 | int ubi_add_volume(struct ubi_device *ubi, int vol_id) | |
568 | { | |
569 | int err; | |
570 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
571 | ||
572 | dbg_msg("add volume %d", vol_id); | |
573 | ubi_dbg_dump_vol_info(vol); | |
574 | ubi_assert(vol); | |
575 | ||
576 | /* Register character device for the volume */ | |
577 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
578 | vol->cdev.owner = THIS_MODULE; | |
579 | err = cdev_add(&vol->cdev, MKDEV(ubi->major, vol->vol_id + 1), 1); | |
580 | if (err) { | |
581 | ubi_err("cannot add character device for volume %d", vol_id); | |
582 | return err; | |
583 | } | |
584 | ||
585 | err = ubi_create_gluebi(ubi, vol); | |
586 | if (err) | |
587 | goto out_cdev; | |
588 | ||
589 | vol->dev.release = vol_release; | |
590 | vol->dev.parent = &ubi->dev; | |
591 | vol->dev.devt = MKDEV(ubi->major, vol->vol_id + 1); | |
592 | vol->dev.class = ubi_class; | |
593 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); | |
594 | err = device_register(&vol->dev); | |
595 | if (err) | |
596 | goto out_gluebi; | |
597 | ||
598 | err = volume_sysfs_init(ubi, vol); | |
599 | if (err) { | |
600 | cdev_del(&vol->cdev); | |
601 | err = ubi_destroy_gluebi(vol); | |
602 | volume_sysfs_close(vol); | |
603 | return err; | |
604 | } | |
605 | ||
606 | paranoid_check_volumes(ubi); | |
607 | return 0; | |
608 | ||
609 | out_gluebi: | |
610 | err = ubi_destroy_gluebi(vol); | |
611 | out_cdev: | |
612 | cdev_del(&vol->cdev); | |
613 | return err; | |
614 | } | |
615 | ||
616 | /** | |
617 | * ubi_free_volume - free volume. | |
618 | * @ubi: UBI device description object | |
619 | * @vol_id: volume ID | |
620 | * | |
621 | * This function frees all resources for volume @vol_id but does not remove it. | |
622 | * Used only when the UBI device is detached. | |
623 | */ | |
624 | void ubi_free_volume(struct ubi_device *ubi, int vol_id) | |
625 | { | |
626 | int err; | |
627 | struct ubi_volume *vol = ubi->volumes[vol_id]; | |
628 | ||
629 | dbg_msg("free volume %d", vol_id); | |
630 | ubi_assert(vol); | |
631 | ||
632 | vol->removed = 1; | |
633 | err = ubi_destroy_gluebi(vol); | |
634 | ubi->volumes[vol_id] = NULL; | |
635 | cdev_del(&vol->cdev); | |
636 | volume_sysfs_close(vol); | |
637 | } | |
638 | ||
639 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
640 | ||
641 | /** | |
642 | * paranoid_check_volume - check volume information. | |
643 | * @ubi: UBI device description object | |
644 | * @vol_id: volume ID | |
645 | */ | |
646 | static void paranoid_check_volume(const struct ubi_device *ubi, int vol_id) | |
647 | { | |
648 | int idx = vol_id2idx(ubi, vol_id); | |
649 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
650 | const struct ubi_volume *vol = ubi->volumes[idx]; | |
651 | long long n; | |
652 | const char *name; | |
653 | ||
654 | reserved_pebs = ubi32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); | |
655 | ||
656 | if (!vol) { | |
657 | if (reserved_pebs) { | |
658 | ubi_err("no volume info, but volume exists"); | |
659 | goto fail; | |
660 | } | |
661 | return; | |
662 | } | |
663 | ||
664 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
665 | vol->name_len < 0) { | |
666 | ubi_err("negative values"); | |
667 | goto fail; | |
668 | } | |
669 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
670 | ubi_err("bad alignment"); | |
671 | goto fail; | |
672 | } | |
673 | ||
674 | n = vol->alignment % ubi->min_io_size; | |
675 | if (vol->alignment != 1 && n) { | |
676 | ubi_err("alignment is not multiple of min I/O unit"); | |
677 | goto fail; | |
678 | } | |
679 | ||
680 | n = ubi->leb_size % vol->alignment; | |
681 | if (vol->data_pad != n) { | |
682 | ubi_err("bad data_pad, has to be %lld", n); | |
683 | goto fail; | |
684 | } | |
685 | ||
686 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
687 | vol->vol_type != UBI_STATIC_VOLUME) { | |
688 | ubi_err("bad vol_type"); | |
689 | goto fail; | |
690 | } | |
691 | ||
692 | if (vol->upd_marker != 0 && vol->upd_marker != 1) { | |
693 | ubi_err("bad upd_marker"); | |
694 | goto fail; | |
695 | } | |
696 | ||
697 | if (vol->upd_marker && vol->corrupted) { | |
698 | dbg_err("update marker and corrupted simultaneously"); | |
699 | goto fail; | |
700 | } | |
701 | ||
702 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
703 | ubi_err("too large reserved_pebs"); | |
704 | goto fail; | |
705 | } | |
706 | ||
707 | n = ubi->leb_size - vol->data_pad; | |
708 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
709 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
710 | goto fail; | |
711 | } | |
712 | ||
713 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
714 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
715 | goto fail; | |
716 | } | |
717 | ||
718 | if (!vol->name) { | |
719 | ubi_err("NULL volume name"); | |
720 | goto fail; | |
721 | } | |
722 | ||
723 | n = strnlen(vol->name, vol->name_len + 1); | |
724 | if (n != vol->name_len) { | |
725 | ubi_err("bad name_len %lld", n); | |
726 | goto fail; | |
727 | } | |
728 | ||
729 | n = vol->used_ebs * vol->usable_leb_size; | |
730 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
731 | if (vol->corrupted != 0) { | |
732 | ubi_err("corrupted dynamic volume"); | |
733 | goto fail; | |
734 | } | |
735 | if (vol->used_ebs != vol->reserved_pebs) { | |
736 | ubi_err("bad used_ebs"); | |
737 | goto fail; | |
738 | } | |
739 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
740 | ubi_err("bad last_eb_bytes"); | |
741 | goto fail; | |
742 | } | |
743 | if (vol->used_bytes != n) { | |
744 | ubi_err("bad used_bytes"); | |
745 | goto fail; | |
746 | } | |
747 | } else { | |
748 | if (vol->corrupted != 0 && vol->corrupted != 1) { | |
749 | ubi_err("bad corrupted"); | |
750 | goto fail; | |
751 | } | |
752 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { | |
753 | ubi_err("bad used_ebs"); | |
754 | goto fail; | |
755 | } | |
756 | if (vol->last_eb_bytes < 0 || | |
757 | vol->last_eb_bytes > vol->usable_leb_size) { | |
758 | ubi_err("bad last_eb_bytes"); | |
759 | goto fail; | |
760 | } | |
761 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
762 | vol->used_bytes < n - vol->usable_leb_size) { | |
763 | ubi_err("bad used_bytes"); | |
764 | goto fail; | |
765 | } | |
766 | } | |
767 | ||
768 | alignment = ubi32_to_cpu(ubi->vtbl[vol_id].alignment); | |
769 | data_pad = ubi32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
770 | name_len = ubi16_to_cpu(ubi->vtbl[vol_id].name_len); | |
771 | upd_marker = ubi->vtbl[vol_id].upd_marker; | |
772 | name = &ubi->vtbl[vol_id].name[0]; | |
773 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
774 | vol_type = UBI_DYNAMIC_VOLUME; | |
775 | else | |
776 | vol_type = UBI_STATIC_VOLUME; | |
777 | ||
778 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
779 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
780 | name_len!= vol->name_len || strncmp(name, vol->name, name_len)) { | |
781 | ubi_err("volume info is different"); | |
782 | goto fail; | |
783 | } | |
784 | ||
785 | return; | |
786 | ||
787 | fail: | |
788 | ubi_err("paranoid check failed"); | |
789 | ubi_dbg_dump_vol_info(vol); | |
790 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); | |
791 | BUG(); | |
792 | } | |
793 | ||
794 | /** | |
795 | * paranoid_check_volumes - check information about all volumes. | |
796 | * @ubi: UBI device description object | |
797 | */ | |
798 | static void paranoid_check_volumes(struct ubi_device *ubi) | |
799 | { | |
800 | int i; | |
801 | ||
802 | mutex_lock(&ubi->vtbl_mutex); | |
803 | spin_lock(&ubi->volumes_lock); | |
804 | for (i = 0; i < ubi->vtbl_slots; i++) | |
805 | paranoid_check_volume(ubi, i); | |
806 | spin_unlock(&ubi->volumes_lock); | |
807 | mutex_unlock(&ubi->vtbl_mutex); | |
808 | } | |
809 | #endif |