Commit | Line | Data |
---|---|---|
801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This file contains implementation of volume creation, deletion, updating and | |
23 | * resizing. | |
24 | */ | |
25 | ||
26 | #include <linux/err.h> | |
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 | * | |
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 | |
801c135c AB |
130 | kfree(vol); |
131 | } | |
132 | ||
133 | /** | |
134 | * volume_sysfs_init - initialize sysfs for new volume. | |
135 | * @ubi: UBI device description object | |
136 | * @vol: volume description object | |
137 | * | |
138 | * This function returns zero in case of success and a negative error code in | |
139 | * case of failure. | |
140 | * | |
141 | * Note, this function does not free allocated resources in case of failure - | |
142 | * the caller does it. This is because this would cause release() here and the | |
143 | * caller would oops. | |
144 | */ | |
145 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) | |
146 | { | |
147 | int err; | |
148 | ||
8bc22961 | 149 | err = device_create_file(&vol->dev, &attr_vol_reserved_ebs); |
801c135c AB |
150 | if (err) |
151 | return err; | |
8bc22961 | 152 | err = device_create_file(&vol->dev, &attr_vol_type); |
801c135c AB |
153 | if (err) |
154 | return err; | |
8bc22961 | 155 | err = device_create_file(&vol->dev, &attr_vol_name); |
801c135c AB |
156 | if (err) |
157 | return err; | |
8bc22961 | 158 | err = device_create_file(&vol->dev, &attr_vol_corrupted); |
801c135c AB |
159 | if (err) |
160 | return err; | |
8bc22961 | 161 | err = device_create_file(&vol->dev, &attr_vol_alignment); |
801c135c AB |
162 | if (err) |
163 | return err; | |
8bc22961 | 164 | err = device_create_file(&vol->dev, &attr_vol_usable_eb_size); |
801c135c AB |
165 | if (err) |
166 | return err; | |
8bc22961 | 167 | err = device_create_file(&vol->dev, &attr_vol_data_bytes); |
801c135c AB |
168 | if (err) |
169 | return err; | |
8bc22961 | 170 | err = device_create_file(&vol->dev, &attr_vol_upd_marker); |
fc75a1e1 | 171 | return err; |
801c135c AB |
172 | } |
173 | ||
174 | /** | |
175 | * volume_sysfs_close - close sysfs for a volume. | |
176 | * @vol: volume description object | |
177 | */ | |
178 | static void volume_sysfs_close(struct ubi_volume *vol) | |
179 | { | |
8bc22961 AB |
180 | device_remove_file(&vol->dev, &attr_vol_upd_marker); |
181 | device_remove_file(&vol->dev, &attr_vol_data_bytes); | |
182 | device_remove_file(&vol->dev, &attr_vol_usable_eb_size); | |
183 | device_remove_file(&vol->dev, &attr_vol_alignment); | |
184 | device_remove_file(&vol->dev, &attr_vol_corrupted); | |
185 | device_remove_file(&vol->dev, &attr_vol_name); | |
186 | device_remove_file(&vol->dev, &attr_vol_type); | |
187 | device_remove_file(&vol->dev, &attr_vol_reserved_ebs); | |
801c135c AB |
188 | device_unregister(&vol->dev); |
189 | } | |
190 | ||
191 | /** | |
192 | * ubi_create_volume - create volume. | |
193 | * @ubi: UBI device description object | |
194 | * @req: volume creation request | |
195 | * | |
196 | * This function creates volume described by @req. If @req->vol_id id | |
d05c77a8 | 197 | * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume |
801c135c | 198 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
40e4d0c1 AB |
199 | * error code in case of failure. Note, the caller has to have the |
200 | * @ubi->volumes_mutex locked. | |
801c135c AB |
201 | */ |
202 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
203 | { | |
fc75a1e1 | 204 | int i, err, vol_id = req->vol_id, dont_free = 0; |
801c135c AB |
205 | struct ubi_volume *vol; |
206 | struct ubi_vtbl_record vtbl_rec; | |
207 | uint64_t bytes; | |
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 */ | |
220 | dbg_msg("search for vacant volume ID"); | |
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 | ||
235 | dbg_msg("volume ID %d, %llu bytes, type %d, name %s", | |
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 | ||
255 | /* Calculate how many eraseblocks are requested */ | |
256 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; | |
257 | bytes = req->bytes; | |
258 | if (do_div(bytes, vol->usable_leb_size)) | |
259 | vol->reserved_pebs = 1; | |
260 | vol->reserved_pebs += bytes; | |
261 | ||
262 | /* Reserve physical eraseblocks */ | |
263 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
264 | dbg_err("not enough PEBs, only %d available", ubi->avail_pebs); | |
801c135c AB |
265 | err = -ENOSPC; |
266 | goto out_unlock; | |
267 | } | |
268 | ubi->avail_pebs -= vol->reserved_pebs; | |
269 | ubi->rsvd_pebs += vol->reserved_pebs; | |
e73f4459 | 270 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
271 | |
272 | vol->vol_id = vol_id; | |
273 | vol->alignment = req->alignment; | |
274 | vol->data_pad = ubi->leb_size % vol->alignment; | |
275 | vol->vol_type = req->vol_type; | |
276 | vol->name_len = req->name_len; | |
277 | memcpy(vol->name, req->name, vol->name_len + 1); | |
801c135c | 278 | vol->ubi = ubi; |
801c135c AB |
279 | |
280 | /* | |
281 | * Finish all pending erases because there may be some LEBs belonging | |
282 | * to the same volume ID. | |
283 | */ | |
284 | err = ubi_wl_flush(ubi); | |
285 | if (err) | |
286 | goto out_acc; | |
287 | ||
288 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
289 | if (!vol->eba_tbl) { | |
290 | err = -ENOMEM; | |
291 | goto out_acc; | |
292 | } | |
293 | ||
294 | for (i = 0; i < vol->reserved_pebs; i++) | |
295 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
296 | ||
297 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
298 | vol->used_ebs = vol->reserved_pebs; | |
299 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
300 | vol->used_bytes = |
301 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
302 | } else { |
303 | bytes = vol->used_bytes; | |
304 | vol->last_eb_bytes = do_div(bytes, vol->usable_leb_size); | |
305 | vol->used_ebs = bytes; | |
306 | if (vol->last_eb_bytes) | |
307 | vol->used_ebs += 1; | |
308 | else | |
309 | vol->last_eb_bytes = vol->usable_leb_size; | |
310 | } | |
311 | ||
312 | /* Register character device for the volume */ | |
313 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
314 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
315 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
316 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 317 | if (err) { |
01f7b309 | 318 | ubi_err("cannot add character device"); |
801c135c AB |
319 | goto out_mapping; |
320 | } | |
321 | ||
322 | err = ubi_create_gluebi(ubi, vol); | |
323 | if (err) | |
324 | goto out_cdev; | |
325 | ||
326 | vol->dev.release = vol_release; | |
327 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 328 | vol->dev.devt = dev; |
801c135c | 329 | vol->dev.class = ubi_class; |
fc75a1e1 | 330 | |
801c135c AB |
331 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); |
332 | err = device_register(&vol->dev); | |
01f7b309 AB |
333 | if (err) { |
334 | ubi_err("cannot register device"); | |
801c135c | 335 | goto out_gluebi; |
01f7b309 | 336 | } |
801c135c AB |
337 | |
338 | err = volume_sysfs_init(ubi, vol); | |
339 | if (err) | |
340 | goto out_sysfs; | |
341 | ||
342 | /* Fill volume table record */ | |
343 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
3261ebd7 CH |
344 | vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); |
345 | vtbl_rec.alignment = cpu_to_be32(vol->alignment); | |
346 | vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); | |
347 | vtbl_rec.name_len = cpu_to_be16(vol->name_len); | |
801c135c AB |
348 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
349 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
350 | else | |
351 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
352 | memcpy(vtbl_rec.name, vol->name, vol->name_len + 1); | |
353 | ||
354 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
355 | if (err) | |
356 | goto out_sysfs; | |
357 | ||
358 | spin_lock(&ubi->volumes_lock); | |
d05c77a8 | 359 | ubi->volumes[vol_id] = vol; |
4b3cc340 | 360 | ubi->vol_count += 1; |
801c135c AB |
361 | spin_unlock(&ubi->volumes_lock); |
362 | ||
363 | paranoid_check_volumes(ubi); | |
364 | return 0; | |
365 | ||
fc75a1e1 AB |
366 | out_sysfs: |
367 | /* | |
d05c77a8 | 368 | * We have registered our device, we should not free the volume* |
fc75a1e1 AB |
369 | * description object in this function in case of an error - it is |
370 | * freed by the release function. | |
371 | * | |
372 | * Get device reference to prevent the release function from being | |
373 | * called just after sysfs has been closed. | |
374 | */ | |
375 | dont_free = 1; | |
376 | get_device(&vol->dev); | |
377 | volume_sysfs_close(vol); | |
801c135c | 378 | out_gluebi: |
fc75a1e1 | 379 | ubi_destroy_gluebi(vol); |
801c135c AB |
380 | out_cdev: |
381 | cdev_del(&vol->cdev); | |
382 | out_mapping: | |
383 | kfree(vol->eba_tbl); | |
384 | out_acc: | |
385 | spin_lock(&ubi->volumes_lock); | |
386 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
387 | ubi->avail_pebs += vol->reserved_pebs; | |
388 | out_unlock: | |
389 | spin_unlock(&ubi->volumes_lock); | |
fc75a1e1 AB |
390 | if (dont_free) |
391 | put_device(&vol->dev); | |
392 | else | |
393 | kfree(vol); | |
01f7b309 | 394 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
395 | return err; |
396 | } | |
397 | ||
398 | /** | |
399 | * ubi_remove_volume - remove volume. | |
400 | * @desc: volume descriptor | |
401 | * | |
402 | * This function removes volume described by @desc. The volume has to be opened | |
403 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
40e4d0c1 AB |
404 | * code in case of failure. The caller has to have the @ubi->volumes_mutex |
405 | * locked. | |
801c135c AB |
406 | */ |
407 | int ubi_remove_volume(struct ubi_volume_desc *desc) | |
408 | { | |
409 | struct ubi_volume *vol = desc->vol; | |
410 | struct ubi_device *ubi = vol->ubi; | |
411 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
412 | ||
413 | dbg_msg("remove UBI volume %d", vol_id); | |
414 | ubi_assert(desc->mode == UBI_EXCLUSIVE); | |
415 | ubi_assert(vol == ubi->volumes[vol_id]); | |
416 | ||
417 | if (ubi->ro_mode) | |
418 | return -EROFS; | |
419 | ||
d05c77a8 AB |
420 | spin_lock(&ubi->volumes_lock); |
421 | if (vol->ref_count > 1) { | |
422 | /* | |
423 | * The volume is busy, probably someone is reading one of its | |
424 | * sysfs files. | |
425 | */ | |
426 | err = -EBUSY; | |
427 | goto out_unlock; | |
428 | } | |
429 | ubi->volumes[vol_id] = NULL; | |
430 | spin_unlock(&ubi->volumes_lock); | |
431 | ||
801c135c AB |
432 | err = ubi_destroy_gluebi(vol); |
433 | if (err) | |
d05c77a8 | 434 | goto out_err; |
801c135c AB |
435 | |
436 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
437 | if (err) | |
d05c77a8 | 438 | goto out_err; |
801c135c AB |
439 | |
440 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 441 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 442 | if (err) |
d05c77a8 | 443 | goto out_err; |
801c135c AB |
444 | } |
445 | ||
801c135c AB |
446 | kfree(vol->eba_tbl); |
447 | vol->eba_tbl = NULL; | |
448 | cdev_del(&vol->cdev); | |
449 | volume_sysfs_close(vol); | |
801c135c AB |
450 | |
451 | spin_lock(&ubi->volumes_lock); | |
452 | ubi->rsvd_pebs -= reserved_pebs; | |
453 | ubi->avail_pebs += reserved_pebs; | |
454 | i = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
455 | if (i > 0) { | |
456 | i = ubi->avail_pebs >= i ? i : ubi->avail_pebs; | |
457 | ubi->avail_pebs -= i; | |
458 | ubi->rsvd_pebs += i; | |
459 | ubi->beb_rsvd_pebs += i; | |
460 | if (i > 0) | |
461 | ubi_msg("reserve more %d PEBs", i); | |
462 | } | |
463 | ubi->vol_count -= 1; | |
464 | spin_unlock(&ubi->volumes_lock); | |
465 | ||
466 | paranoid_check_volumes(ubi); | |
d05c77a8 AB |
467 | return 0; |
468 | ||
469 | out_err: | |
470 | ubi_err("cannot remove volume %d, error %d", vol_id, err); | |
471 | spin_lock(&ubi->volumes_lock); | |
472 | ubi->volumes[vol_id] = vol; | |
473 | out_unlock: | |
474 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 475 | return err; |
801c135c AB |
476 | } |
477 | ||
478 | /** | |
479 | * ubi_resize_volume - re-size volume. | |
480 | * @desc: volume descriptor | |
481 | * @reserved_pebs: new size in physical eraseblocks | |
482 | * | |
40e4d0c1 AB |
483 | * This function re-sizes the volume and returns zero in case of success, and a |
484 | * negative error code in case of failure. The caller has to have the | |
485 | * @ubi->volumes_mutex locked. | |
801c135c AB |
486 | */ |
487 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
488 | { | |
489 | int i, err, pebs, *new_mapping; | |
490 | struct ubi_volume *vol = desc->vol; | |
491 | struct ubi_device *ubi = vol->ubi; | |
492 | struct ubi_vtbl_record vtbl_rec; | |
493 | int vol_id = vol->vol_id; | |
494 | ||
495 | if (ubi->ro_mode) | |
496 | return -EROFS; | |
497 | ||
498 | dbg_msg("re-size volume %d to from %d to %d PEBs", | |
499 | vol_id, vol->reserved_pebs, reserved_pebs); | |
801c135c AB |
500 | |
501 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
502 | reserved_pebs < vol->used_ebs) { | |
503 | dbg_err("too small size %d, %d LEBs contain data", | |
504 | reserved_pebs, vol->used_ebs); | |
505 | return -EINVAL; | |
506 | } | |
507 | ||
508 | /* If the size is the same, we have nothing to do */ | |
509 | if (reserved_pebs == vol->reserved_pebs) | |
510 | return 0; | |
511 | ||
512 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
513 | if (!new_mapping) | |
514 | return -ENOMEM; | |
515 | ||
516 | for (i = 0; i < reserved_pebs; i++) | |
517 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
518 | ||
d05c77a8 AB |
519 | spin_lock(&ubi->volumes_lock); |
520 | if (vol->ref_count > 1) { | |
521 | spin_unlock(&ubi->volumes_lock); | |
522 | err = -EBUSY; | |
523 | goto out_free; | |
524 | } | |
525 | spin_unlock(&ubi->volumes_lock); | |
526 | ||
d05c77a8 | 527 | /* Reserve physical eraseblocks */ |
801c135c AB |
528 | pebs = reserved_pebs - vol->reserved_pebs; |
529 | if (pebs > 0) { | |
530 | spin_lock(&ubi->volumes_lock); | |
531 | if (pebs > ubi->avail_pebs) { | |
532 | dbg_err("not enough PEBs: requested %d, available %d", | |
533 | pebs, ubi->avail_pebs); | |
534 | spin_unlock(&ubi->volumes_lock); | |
535 | err = -ENOSPC; | |
536 | goto out_free; | |
537 | } | |
538 | ubi->avail_pebs -= pebs; | |
539 | ubi->rsvd_pebs += pebs; | |
540 | for (i = 0; i < vol->reserved_pebs; i++) | |
541 | new_mapping[i] = vol->eba_tbl[i]; | |
542 | kfree(vol->eba_tbl); | |
543 | vol->eba_tbl = new_mapping; | |
544 | spin_unlock(&ubi->volumes_lock); | |
545 | } | |
546 | ||
547 | /* Change volume table record */ | |
548 | memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); | |
3261ebd7 | 549 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); |
801c135c AB |
550 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); |
551 | if (err) | |
552 | goto out_acc; | |
553 | ||
554 | if (pebs < 0) { | |
555 | for (i = 0; i < -pebs; i++) { | |
89b96b69 | 556 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
557 | if (err) |
558 | goto out_acc; | |
559 | } | |
560 | spin_lock(&ubi->volumes_lock); | |
561 | ubi->rsvd_pebs += pebs; | |
562 | ubi->avail_pebs -= pebs; | |
563 | pebs = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs; | |
564 | if (pebs > 0) { | |
565 | pebs = ubi->avail_pebs >= pebs ? pebs : ubi->avail_pebs; | |
566 | ubi->avail_pebs -= pebs; | |
567 | ubi->rsvd_pebs += pebs; | |
568 | ubi->beb_rsvd_pebs += pebs; | |
569 | if (pebs > 0) | |
570 | ubi_msg("reserve more %d PEBs", pebs); | |
571 | } | |
572 | for (i = 0; i < reserved_pebs; i++) | |
573 | new_mapping[i] = vol->eba_tbl[i]; | |
574 | kfree(vol->eba_tbl); | |
575 | vol->eba_tbl = new_mapping; | |
576 | spin_unlock(&ubi->volumes_lock); | |
577 | } | |
578 | ||
579 | vol->reserved_pebs = reserved_pebs; | |
580 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
581 | vol->used_ebs = reserved_pebs; | |
582 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
583 | vol->used_bytes = |
584 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
585 | } |
586 | ||
587 | paranoid_check_volumes(ubi); | |
588 | return 0; | |
589 | ||
590 | out_acc: | |
591 | if (pebs > 0) { | |
592 | spin_lock(&ubi->volumes_lock); | |
593 | ubi->rsvd_pebs -= pebs; | |
594 | ubi->avail_pebs += pebs; | |
595 | spin_unlock(&ubi->volumes_lock); | |
596 | } | |
597 | out_free: | |
598 | kfree(new_mapping); | |
599 | return err; | |
600 | } | |
601 | ||
602 | /** | |
603 | * ubi_add_volume - add volume. | |
604 | * @ubi: UBI device description object | |
89b96b69 | 605 | * @vol: volume description object |
801c135c | 606 | * |
d05c77a8 AB |
607 | * This function adds an existing volume and initializes all its data |
608 | * structures. Returns zero in case of success and a negative error code in | |
801c135c AB |
609 | * case of failure. |
610 | */ | |
89b96b69 | 611 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 612 | { |
89b96b69 | 613 | int err, vol_id = vol->vol_id; |
49dfc299 | 614 | dev_t dev; |
801c135c AB |
615 | |
616 | dbg_msg("add volume %d", vol_id); | |
617 | ubi_dbg_dump_vol_info(vol); | |
801c135c AB |
618 | |
619 | /* Register character device for the volume */ | |
620 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
621 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
622 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
623 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 624 | if (err) { |
01f7b309 AB |
625 | ubi_err("cannot add character device for volume %d, error %d", |
626 | vol_id, err); | |
801c135c AB |
627 | return err; |
628 | } | |
629 | ||
630 | err = ubi_create_gluebi(ubi, vol); | |
631 | if (err) | |
632 | goto out_cdev; | |
633 | ||
634 | vol->dev.release = vol_release; | |
635 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 636 | vol->dev.devt = dev; |
801c135c AB |
637 | vol->dev.class = ubi_class; |
638 | sprintf(&vol->dev.bus_id[0], "%s_%d", ubi->ubi_name, vol->vol_id); | |
639 | err = device_register(&vol->dev); | |
640 | if (err) | |
641 | goto out_gluebi; | |
642 | ||
643 | err = volume_sysfs_init(ubi, vol); | |
644 | if (err) { | |
645 | cdev_del(&vol->cdev); | |
646 | err = ubi_destroy_gluebi(vol); | |
647 | volume_sysfs_close(vol); | |
648 | return err; | |
649 | } | |
650 | ||
651 | paranoid_check_volumes(ubi); | |
652 | return 0; | |
653 | ||
654 | out_gluebi: | |
655 | err = ubi_destroy_gluebi(vol); | |
656 | out_cdev: | |
657 | cdev_del(&vol->cdev); | |
658 | return err; | |
659 | } | |
660 | ||
661 | /** | |
662 | * ubi_free_volume - free volume. | |
663 | * @ubi: UBI device description object | |
89b96b69 | 664 | * @vol: volume description object |
801c135c | 665 | * |
89b96b69 | 666 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
667 | * Used only when the UBI device is detached. |
668 | */ | |
89b96b69 | 669 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c AB |
670 | { |
671 | int err; | |
801c135c | 672 | |
89b96b69 | 673 | dbg_msg("free volume %d", vol->vol_id); |
801c135c | 674 | |
89b96b69 | 675 | ubi->volumes[vol->vol_id] = NULL; |
d05c77a8 | 676 | err = ubi_destroy_gluebi(vol); |
801c135c AB |
677 | cdev_del(&vol->cdev); |
678 | volume_sysfs_close(vol); | |
679 | } | |
680 | ||
681 | #ifdef CONFIG_MTD_UBI_DEBUG_PARANOID | |
682 | ||
683 | /** | |
684 | * paranoid_check_volume - check volume information. | |
685 | * @ubi: UBI device description object | |
686 | * @vol_id: volume ID | |
687 | */ | |
b89044bf | 688 | static void paranoid_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
689 | { |
690 | int idx = vol_id2idx(ubi, vol_id); | |
691 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 692 | const struct ubi_volume *vol; |
801c135c AB |
693 | long long n; |
694 | const char *name; | |
695 | ||
b89044bf | 696 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 697 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 698 | vol = ubi->volumes[idx]; |
801c135c AB |
699 | |
700 | if (!vol) { | |
701 | if (reserved_pebs) { | |
702 | ubi_err("no volume info, but volume exists"); | |
703 | goto fail; | |
704 | } | |
b89044bf AB |
705 | spin_unlock(&ubi->volumes_lock); |
706 | return; | |
707 | } | |
708 | ||
709 | if (vol->exclusive) { | |
710 | /* | |
711 | * The volume may be being created at the moment, do not check | |
712 | * it (e.g., it may be in the middle of ubi_create_volume(). | |
713 | */ | |
714 | spin_unlock(&ubi->volumes_lock); | |
801c135c AB |
715 | return; |
716 | } | |
717 | ||
718 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
719 | vol->name_len < 0) { | |
720 | ubi_err("negative values"); | |
721 | goto fail; | |
722 | } | |
723 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
724 | ubi_err("bad alignment"); | |
725 | goto fail; | |
726 | } | |
727 | ||
728 | n = vol->alignment % ubi->min_io_size; | |
729 | if (vol->alignment != 1 && n) { | |
730 | ubi_err("alignment is not multiple of min I/O unit"); | |
731 | goto fail; | |
732 | } | |
733 | ||
734 | n = ubi->leb_size % vol->alignment; | |
735 | if (vol->data_pad != n) { | |
736 | ubi_err("bad data_pad, has to be %lld", n); | |
737 | goto fail; | |
738 | } | |
739 | ||
740 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
741 | vol->vol_type != UBI_STATIC_VOLUME) { | |
742 | ubi_err("bad vol_type"); | |
743 | goto fail; | |
744 | } | |
745 | ||
801c135c AB |
746 | if (vol->upd_marker && vol->corrupted) { |
747 | dbg_err("update marker and corrupted simultaneously"); | |
748 | goto fail; | |
749 | } | |
750 | ||
751 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
752 | ubi_err("too large reserved_pebs"); | |
753 | goto fail; | |
754 | } | |
755 | ||
756 | n = ubi->leb_size - vol->data_pad; | |
757 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
758 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
759 | goto fail; | |
760 | } | |
761 | ||
762 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
763 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
764 | goto fail; | |
765 | } | |
766 | ||
767 | if (!vol->name) { | |
768 | ubi_err("NULL volume name"); | |
769 | goto fail; | |
770 | } | |
771 | ||
772 | n = strnlen(vol->name, vol->name_len + 1); | |
773 | if (n != vol->name_len) { | |
774 | ubi_err("bad name_len %lld", n); | |
775 | goto fail; | |
776 | } | |
777 | ||
d08c3b78 | 778 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c | 779 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
896c0c06 | 780 | if (vol->corrupted) { |
801c135c AB |
781 | ubi_err("corrupted dynamic volume"); |
782 | goto fail; | |
783 | } | |
784 | if (vol->used_ebs != vol->reserved_pebs) { | |
785 | ubi_err("bad used_ebs"); | |
786 | goto fail; | |
787 | } | |
788 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
789 | ubi_err("bad last_eb_bytes"); | |
790 | goto fail; | |
791 | } | |
792 | if (vol->used_bytes != n) { | |
793 | ubi_err("bad used_bytes"); | |
794 | goto fail; | |
795 | } | |
796 | } else { | |
801c135c AB |
797 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
798 | ubi_err("bad used_ebs"); | |
799 | goto fail; | |
800 | } | |
801 | if (vol->last_eb_bytes < 0 || | |
802 | vol->last_eb_bytes > vol->usable_leb_size) { | |
803 | ubi_err("bad last_eb_bytes"); | |
804 | goto fail; | |
805 | } | |
806 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
807 | vol->used_bytes < n - vol->usable_leb_size) { | |
808 | ubi_err("bad used_bytes"); | |
809 | goto fail; | |
810 | } | |
811 | } | |
812 | ||
3261ebd7 CH |
813 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
814 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
815 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); | |
801c135c AB |
816 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
817 | name = &ubi->vtbl[vol_id].name[0]; | |
818 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
819 | vol_type = UBI_DYNAMIC_VOLUME; | |
820 | else | |
821 | vol_type = UBI_STATIC_VOLUME; | |
822 | ||
823 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
824 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
825 | name_len!= vol->name_len || strncmp(name, vol->name, name_len)) { | |
826 | ubi_err("volume info is different"); | |
827 | goto fail; | |
828 | } | |
829 | ||
b89044bf | 830 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
831 | return; |
832 | ||
833 | fail: | |
94784d91 | 834 | ubi_err("paranoid check failed for volume %d", vol_id); |
801c135c AB |
835 | ubi_dbg_dump_vol_info(vol); |
836 | ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); | |
b89044bf | 837 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
838 | BUG(); |
839 | } | |
840 | ||
841 | /** | |
842 | * paranoid_check_volumes - check information about all volumes. | |
843 | * @ubi: UBI device description object | |
844 | */ | |
845 | static void paranoid_check_volumes(struct ubi_device *ubi) | |
846 | { | |
847 | int i; | |
848 | ||
801c135c AB |
849 | for (i = 0; i < ubi->vtbl_slots; i++) |
850 | paranoid_check_volume(ubi, i); | |
801c135c AB |
851 | } |
852 | #endif |