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> | |
3013ee31 | 27 | #include <linux/math64.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
f3bcc017 | 29 | #include <linux/export.h> |
801c135c AB |
30 | #include "ubi.h" |
31 | ||
7bf523ae | 32 | static int self_check_volumes(struct ubi_device *ubi); |
801c135c AB |
33 | |
34 | static ssize_t vol_attribute_show(struct device *dev, | |
35 | struct device_attribute *attr, char *buf); | |
36 | ||
37 | /* Device attributes corresponding to files in '/<sysfs>/class/ubi/ubiX_Y' */ | |
8bc22961 | 38 | static struct device_attribute attr_vol_reserved_ebs = |
801c135c | 39 | __ATTR(reserved_ebs, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 40 | static struct device_attribute attr_vol_type = |
801c135c | 41 | __ATTR(type, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 42 | static struct device_attribute attr_vol_name = |
801c135c | 43 | __ATTR(name, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 44 | static struct device_attribute attr_vol_corrupted = |
801c135c | 45 | __ATTR(corrupted, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 46 | static struct device_attribute attr_vol_alignment = |
801c135c | 47 | __ATTR(alignment, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 48 | static struct device_attribute attr_vol_usable_eb_size = |
801c135c | 49 | __ATTR(usable_eb_size, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 50 | static struct device_attribute attr_vol_data_bytes = |
801c135c | 51 | __ATTR(data_bytes, S_IRUGO, vol_attribute_show, NULL); |
8bc22961 | 52 | static struct device_attribute attr_vol_upd_marker = |
801c135c AB |
53 | __ATTR(upd_marker, S_IRUGO, vol_attribute_show, NULL); |
54 | ||
55 | /* | |
56 | * "Show" method for files in '/<sysfs>/class/ubi/ubiX_Y/'. | |
57 | * | |
58 | * Consider a situation: | |
59 | * A. process 1 opens a sysfs file related to volume Y, say | |
60 | * /<sysfs>/class/ubi/ubiX_Y/reserved_ebs; | |
61 | * B. process 2 removes volume Y; | |
62 | * C. process 1 starts reading the /<sysfs>/class/ubi/ubiX_Y/reserved_ebs file; | |
63 | * | |
d05c77a8 AB |
64 | * In this situation, this function will return %-ENODEV because it will find |
65 | * out that the volume was removed from the @ubi->volumes array. | |
801c135c AB |
66 | */ |
67 | static ssize_t vol_attribute_show(struct device *dev, | |
68 | struct device_attribute *attr, char *buf) | |
69 | { | |
d05c77a8 | 70 | int ret; |
801c135c | 71 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); |
e73f4459 AB |
72 | struct ubi_device *ubi; |
73 | ||
74 | ubi = ubi_get_device(vol->ubi->ubi_num); | |
75 | if (!ubi) | |
76 | return -ENODEV; | |
801c135c | 77 | |
d05c77a8 AB |
78 | spin_lock(&ubi->volumes_lock); |
79 | if (!ubi->volumes[vol->vol_id]) { | |
80 | spin_unlock(&ubi->volumes_lock); | |
e73f4459 | 81 | ubi_put_device(ubi); |
d05c77a8 | 82 | return -ENODEV; |
801c135c | 83 | } |
d05c77a8 AB |
84 | /* Take a reference to prevent volume removal */ |
85 | vol->ref_count += 1; | |
86 | spin_unlock(&ubi->volumes_lock); | |
732aeacf | 87 | |
8bc22961 | 88 | if (attr == &attr_vol_reserved_ebs) |
801c135c | 89 | ret = sprintf(buf, "%d\n", vol->reserved_pebs); |
8bc22961 | 90 | else if (attr == &attr_vol_type) { |
801c135c | 91 | const char *tp; |
8bc22961 AB |
92 | |
93 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) | |
94 | tp = "dynamic"; | |
95 | else | |
96 | tp = "static"; | |
801c135c | 97 | ret = sprintf(buf, "%s\n", tp); |
8bc22961 | 98 | } else if (attr == &attr_vol_name) |
801c135c | 99 | ret = sprintf(buf, "%s\n", vol->name); |
8bc22961 | 100 | else if (attr == &attr_vol_corrupted) |
801c135c | 101 | ret = sprintf(buf, "%d\n", vol->corrupted); |
8bc22961 | 102 | else if (attr == &attr_vol_alignment) |
801c135c | 103 | ret = sprintf(buf, "%d\n", vol->alignment); |
732aeacf | 104 | else if (attr == &attr_vol_usable_eb_size) |
801c135c | 105 | ret = sprintf(buf, "%d\n", vol->usable_leb_size); |
732aeacf | 106 | else if (attr == &attr_vol_data_bytes) |
801c135c | 107 | ret = sprintf(buf, "%lld\n", vol->used_bytes); |
8bc22961 | 108 | else if (attr == &attr_vol_upd_marker) |
801c135c AB |
109 | ret = sprintf(buf, "%d\n", vol->upd_marker); |
110 | else | |
d05c77a8 AB |
111 | /* This must be a bug */ |
112 | ret = -EINVAL; | |
113 | ||
e73f4459 | 114 | /* We've done the operation, drop volume and UBI device references */ |
d05c77a8 AB |
115 | spin_lock(&ubi->volumes_lock); |
116 | vol->ref_count -= 1; | |
117 | ubi_assert(vol->ref_count >= 0); | |
118 | spin_unlock(&ubi->volumes_lock); | |
e73f4459 | 119 | ubi_put_device(ubi); |
801c135c AB |
120 | return ret; |
121 | } | |
122 | ||
53cd255c TI |
123 | static struct attribute *volume_dev_attrs[] = { |
124 | &attr_vol_reserved_ebs.attr, | |
125 | &attr_vol_type.attr, | |
126 | &attr_vol_name.attr, | |
127 | &attr_vol_corrupted.attr, | |
128 | &attr_vol_alignment.attr, | |
129 | &attr_vol_usable_eb_size.attr, | |
130 | &attr_vol_data_bytes.attr, | |
131 | &attr_vol_upd_marker.attr, | |
132 | NULL | |
133 | }; | |
134 | ATTRIBUTE_GROUPS(volume_dev); | |
135 | ||
801c135c AB |
136 | /* Release method for volume devices */ |
137 | static void vol_release(struct device *dev) | |
138 | { | |
139 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); | |
732aeacf | 140 | |
abc5e922 | 141 | kfree(vol->eba_tbl); |
801c135c AB |
142 | kfree(vol); |
143 | } | |
144 | ||
801c135c AB |
145 | /** |
146 | * ubi_create_volume - create volume. | |
147 | * @ubi: UBI device description object | |
148 | * @req: volume creation request | |
149 | * | |
150 | * This function creates volume described by @req. If @req->vol_id id | |
d05c77a8 | 151 | * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume |
801c135c | 152 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
40e4d0c1 | 153 | * error code in case of failure. Note, the caller has to have the |
f089c0b2 | 154 | * @ubi->device_mutex locked. |
801c135c AB |
155 | */ |
156 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
157 | { | |
abc5e922 | 158 | int i, err, vol_id = req->vol_id, do_free = 1; |
801c135c AB |
159 | struct ubi_volume *vol; |
160 | struct ubi_vtbl_record vtbl_rec; | |
49dfc299 | 161 | dev_t dev; |
801c135c AB |
162 | |
163 | if (ubi->ro_mode) | |
164 | return -EROFS; | |
165 | ||
166 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); | |
167 | if (!vol) | |
168 | return -ENOMEM; | |
169 | ||
170 | spin_lock(&ubi->volumes_lock); | |
801c135c AB |
171 | if (vol_id == UBI_VOL_NUM_AUTO) { |
172 | /* Find unused volume ID */ | |
c8566350 | 173 | dbg_gen("search for vacant volume ID"); |
801c135c AB |
174 | for (i = 0; i < ubi->vtbl_slots; i++) |
175 | if (!ubi->volumes[i]) { | |
176 | vol_id = i; | |
177 | break; | |
178 | } | |
179 | ||
180 | if (vol_id == UBI_VOL_NUM_AUTO) { | |
32608703 | 181 | ubi_err(ubi, "out of volume IDs"); |
801c135c AB |
182 | err = -ENFILE; |
183 | goto out_unlock; | |
184 | } | |
185 | req->vol_id = vol_id; | |
186 | } | |
187 | ||
e1cf7e6d AB |
188 | dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s", |
189 | ubi->ubi_num, vol_id, (unsigned long long)req->bytes, | |
801c135c AB |
190 | (int)req->vol_type, req->name); |
191 | ||
192 | /* Ensure that this volume does not exist */ | |
193 | err = -EEXIST; | |
194 | if (ubi->volumes[vol_id]) { | |
32608703 | 195 | ubi_err(ubi, "volume %d already exists", vol_id); |
801c135c AB |
196 | goto out_unlock; |
197 | } | |
198 | ||
199 | /* Ensure that the name is unique */ | |
200 | for (i = 0; i < ubi->vtbl_slots; i++) | |
201 | if (ubi->volumes[i] && | |
202 | ubi->volumes[i]->name_len == req->name_len && | |
94784d91 | 203 | !strcmp(ubi->volumes[i]->name, req->name)) { |
32608703 TB |
204 | ubi_err(ubi, "volume \"%s\" exists (ID %d)", |
205 | req->name, i); | |
801c135c AB |
206 | goto out_unlock; |
207 | } | |
208 | ||
9c9ec147 | 209 | /* Calculate how many eraseblocks are requested */ |
801c135c | 210 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; |
e8d266cf | 211 | vol->reserved_pebs = div_u64(req->bytes + vol->usable_leb_size - 1, |
212 | vol->usable_leb_size); | |
801c135c AB |
213 | |
214 | /* Reserve physical eraseblocks */ | |
215 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
32608703 TB |
216 | ubi_err(ubi, "not enough PEBs, only %d available", |
217 | ubi->avail_pebs); | |
5fc01ab6 | 218 | if (ubi->corr_peb_count) |
32608703 | 219 | ubi_err(ubi, "%d PEBs are corrupted and not used", |
5fc01ab6 | 220 | ubi->corr_peb_count); |
801c135c AB |
221 | err = -ENOSPC; |
222 | goto out_unlock; | |
223 | } | |
224 | ubi->avail_pebs -= vol->reserved_pebs; | |
225 | ubi->rsvd_pebs += vol->reserved_pebs; | |
e73f4459 | 226 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
227 | |
228 | vol->vol_id = vol_id; | |
229 | vol->alignment = req->alignment; | |
230 | vol->data_pad = ubi->leb_size % vol->alignment; | |
231 | vol->vol_type = req->vol_type; | |
232 | vol->name_len = req->name_len; | |
a6ea4407 | 233 | memcpy(vol->name, req->name, vol->name_len); |
801c135c | 234 | vol->ubi = ubi; |
801c135c AB |
235 | |
236 | /* | |
237 | * Finish all pending erases because there may be some LEBs belonging | |
238 | * to the same volume ID. | |
239 | */ | |
62f38455 | 240 | err = ubi_wl_flush(ubi, vol_id, UBI_ALL); |
801c135c AB |
241 | if (err) |
242 | goto out_acc; | |
243 | ||
244 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
245 | if (!vol->eba_tbl) { | |
246 | err = -ENOMEM; | |
247 | goto out_acc; | |
248 | } | |
249 | ||
250 | for (i = 0; i < vol->reserved_pebs; i++) | |
251 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
252 | ||
253 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
254 | vol->used_ebs = vol->reserved_pebs; | |
255 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
256 | vol->used_bytes = |
257 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c | 258 | } else { |
3013ee31 AB |
259 | vol->used_ebs = div_u64_rem(vol->used_bytes, |
260 | vol->usable_leb_size, | |
261 | &vol->last_eb_bytes); | |
262 | if (vol->last_eb_bytes != 0) | |
801c135c AB |
263 | vol->used_ebs += 1; |
264 | else | |
265 | vol->last_eb_bytes = vol->usable_leb_size; | |
266 | } | |
267 | ||
268 | /* Register character device for the volume */ | |
269 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
270 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
271 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
272 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 273 | if (err) { |
32608703 | 274 | ubi_err(ubi, "cannot add character device"); |
801c135c AB |
275 | goto out_mapping; |
276 | } | |
277 | ||
801c135c AB |
278 | vol->dev.release = vol_release; |
279 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 280 | vol->dev.devt = dev; |
53cd255c TI |
281 | vol->dev.class = &ubi_class; |
282 | vol->dev.groups = volume_dev_groups; | |
fc75a1e1 | 283 | |
475b44c1 | 284 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c | 285 | err = device_register(&vol->dev); |
01f7b309 | 286 | if (err) { |
32608703 | 287 | ubi_err(ubi, "cannot register device"); |
518ceef0 | 288 | goto out_cdev; |
01f7b309 | 289 | } |
801c135c | 290 | |
801c135c AB |
291 | /* Fill volume table record */ |
292 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
3261ebd7 CH |
293 | vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); |
294 | vtbl_rec.alignment = cpu_to_be32(vol->alignment); | |
295 | vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); | |
296 | vtbl_rec.name_len = cpu_to_be16(vol->name_len); | |
801c135c AB |
297 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
298 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
299 | else | |
300 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
a6ea4407 | 301 | memcpy(vtbl_rec.name, vol->name, vol->name_len); |
801c135c AB |
302 | |
303 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
304 | if (err) | |
305 | goto out_sysfs; | |
306 | ||
307 | spin_lock(&ubi->volumes_lock); | |
d05c77a8 | 308 | ubi->volumes[vol_id] = vol; |
4b3cc340 | 309 | ubi->vol_count += 1; |
801c135c AB |
310 | spin_unlock(&ubi->volumes_lock); |
311 | ||
0e0ee1cc | 312 | ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED); |
7bf523ae | 313 | self_check_volumes(ubi); |
c8566350 | 314 | return err; |
801c135c | 315 | |
fc75a1e1 AB |
316 | out_sysfs: |
317 | /* | |
abc5e922 | 318 | * We have registered our device, we should not free the volume |
fc75a1e1 AB |
319 | * description object in this function in case of an error - it is |
320 | * freed by the release function. | |
321 | * | |
322 | * Get device reference to prevent the release function from being | |
323 | * called just after sysfs has been closed. | |
324 | */ | |
abc5e922 | 325 | do_free = 0; |
fc75a1e1 | 326 | get_device(&vol->dev); |
53cd255c | 327 | device_unregister(&vol->dev); |
801c135c AB |
328 | out_cdev: |
329 | cdev_del(&vol->cdev); | |
330 | out_mapping: | |
abc5e922 AB |
331 | if (do_free) |
332 | kfree(vol->eba_tbl); | |
801c135c AB |
333 | out_acc: |
334 | spin_lock(&ubi->volumes_lock); | |
335 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
336 | ubi->avail_pebs += vol->reserved_pebs; | |
337 | out_unlock: | |
338 | spin_unlock(&ubi->volumes_lock); | |
abc5e922 | 339 | if (do_free) |
fc75a1e1 | 340 | kfree(vol); |
abc5e922 AB |
341 | else |
342 | put_device(&vol->dev); | |
32608703 | 343 | ubi_err(ubi, "cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
344 | return err; |
345 | } | |
346 | ||
347 | /** | |
348 | * ubi_remove_volume - remove volume. | |
349 | * @desc: volume descriptor | |
f40ac9cd | 350 | * @no_vtbl: do not change volume table if not zero |
801c135c AB |
351 | * |
352 | * This function removes volume described by @desc. The volume has to be opened | |
353 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
f089c0b2 | 354 | * code in case of failure. The caller has to have the @ubi->device_mutex |
40e4d0c1 | 355 | * locked. |
801c135c | 356 | */ |
f40ac9cd | 357 | int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) |
801c135c AB |
358 | { |
359 | struct ubi_volume *vol = desc->vol; | |
360 | struct ubi_device *ubi = vol->ubi; | |
361 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
362 | ||
e1cf7e6d | 363 | dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id); |
801c135c AB |
364 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
365 | ubi_assert(vol == ubi->volumes[vol_id]); | |
366 | ||
367 | if (ubi->ro_mode) | |
368 | return -EROFS; | |
369 | ||
d05c77a8 AB |
370 | spin_lock(&ubi->volumes_lock); |
371 | if (vol->ref_count > 1) { | |
372 | /* | |
373 | * The volume is busy, probably someone is reading one of its | |
374 | * sysfs files. | |
375 | */ | |
376 | err = -EBUSY; | |
377 | goto out_unlock; | |
378 | } | |
379 | ubi->volumes[vol_id] = NULL; | |
380 | spin_unlock(&ubi->volumes_lock); | |
381 | ||
f40ac9cd AB |
382 | if (!no_vtbl) { |
383 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
384 | if (err) | |
385 | goto out_err; | |
386 | } | |
801c135c AB |
387 | |
388 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 389 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 390 | if (err) |
d05c77a8 | 391 | goto out_err; |
801c135c AB |
392 | } |
393 | ||
801c135c | 394 | cdev_del(&vol->cdev); |
53cd255c | 395 | device_unregister(&vol->dev); |
801c135c AB |
396 | |
397 | spin_lock(&ubi->volumes_lock); | |
398 | ubi->rsvd_pebs -= reserved_pebs; | |
399 | ubi->avail_pebs += reserved_pebs; | |
87e773c9 | 400 | ubi_update_reserved(ubi); |
801c135c AB |
401 | ubi->vol_count -= 1; |
402 | spin_unlock(&ubi->volumes_lock); | |
403 | ||
0e0ee1cc | 404 | ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED); |
7bf523ae AB |
405 | if (!no_vtbl) |
406 | self_check_volumes(ubi); | |
d38dce5b | 407 | |
fadb3665 | 408 | return 0; |
d05c77a8 AB |
409 | |
410 | out_err: | |
32608703 | 411 | ubi_err(ubi, "cannot remove volume %d, error %d", vol_id, err); |
d05c77a8 AB |
412 | spin_lock(&ubi->volumes_lock); |
413 | ubi->volumes[vol_id] = vol; | |
414 | out_unlock: | |
415 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 416 | return err; |
801c135c AB |
417 | } |
418 | ||
419 | /** | |
420 | * ubi_resize_volume - re-size volume. | |
421 | * @desc: volume descriptor | |
422 | * @reserved_pebs: new size in physical eraseblocks | |
423 | * | |
40e4d0c1 AB |
424 | * This function re-sizes the volume and returns zero in case of success, and a |
425 | * negative error code in case of failure. The caller has to have the | |
f089c0b2 | 426 | * @ubi->device_mutex locked. |
801c135c AB |
427 | */ |
428 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
429 | { | |
430 | int i, err, pebs, *new_mapping; | |
431 | struct ubi_volume *vol = desc->vol; | |
432 | struct ubi_device *ubi = vol->ubi; | |
433 | struct ubi_vtbl_record vtbl_rec; | |
434 | int vol_id = vol->vol_id; | |
435 | ||
436 | if (ubi->ro_mode) | |
437 | return -EROFS; | |
438 | ||
e1cf7e6d AB |
439 | dbg_gen("re-size device %d, volume %d to from %d to %d PEBs", |
440 | ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs); | |
801c135c AB |
441 | |
442 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
443 | reserved_pebs < vol->used_ebs) { | |
32608703 | 444 | ubi_err(ubi, "too small size %d, %d LEBs contain data", |
801c135c AB |
445 | reserved_pebs, vol->used_ebs); |
446 | return -EINVAL; | |
447 | } | |
448 | ||
449 | /* If the size is the same, we have nothing to do */ | |
450 | if (reserved_pebs == vol->reserved_pebs) | |
451 | return 0; | |
452 | ||
453 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
454 | if (!new_mapping) | |
455 | return -ENOMEM; | |
456 | ||
457 | for (i = 0; i < reserved_pebs; i++) | |
458 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
459 | ||
d05c77a8 AB |
460 | spin_lock(&ubi->volumes_lock); |
461 | if (vol->ref_count > 1) { | |
462 | spin_unlock(&ubi->volumes_lock); | |
463 | err = -EBUSY; | |
464 | goto out_free; | |
465 | } | |
466 | spin_unlock(&ubi->volumes_lock); | |
467 | ||
d05c77a8 | 468 | /* Reserve physical eraseblocks */ |
801c135c AB |
469 | pebs = reserved_pebs - vol->reserved_pebs; |
470 | if (pebs > 0) { | |
471 | spin_lock(&ubi->volumes_lock); | |
472 | if (pebs > ubi->avail_pebs) { | |
32608703 | 473 | ubi_err(ubi, "not enough PEBs: requested %d, available %d", |
801c135c | 474 | pebs, ubi->avail_pebs); |
5fc01ab6 | 475 | if (ubi->corr_peb_count) |
32608703 | 476 | ubi_err(ubi, "%d PEBs are corrupted and not used", |
5fc01ab6 | 477 | ubi->corr_peb_count); |
801c135c AB |
478 | spin_unlock(&ubi->volumes_lock); |
479 | err = -ENOSPC; | |
480 | goto out_free; | |
481 | } | |
482 | ubi->avail_pebs -= pebs; | |
483 | ubi->rsvd_pebs += pebs; | |
484 | for (i = 0; i < vol->reserved_pebs; i++) | |
485 | new_mapping[i] = vol->eba_tbl[i]; | |
486 | kfree(vol->eba_tbl); | |
487 | vol->eba_tbl = new_mapping; | |
488 | spin_unlock(&ubi->volumes_lock); | |
489 | } | |
490 | ||
801c135c AB |
491 | if (pebs < 0) { |
492 | for (i = 0; i < -pebs; i++) { | |
89b96b69 | 493 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
494 | if (err) |
495 | goto out_acc; | |
496 | } | |
497 | spin_lock(&ubi->volumes_lock); | |
498 | ubi->rsvd_pebs += pebs; | |
499 | ubi->avail_pebs -= pebs; | |
87e773c9 | 500 | ubi_update_reserved(ubi); |
801c135c AB |
501 | for (i = 0; i < reserved_pebs; i++) |
502 | new_mapping[i] = vol->eba_tbl[i]; | |
503 | kfree(vol->eba_tbl); | |
504 | vol->eba_tbl = new_mapping; | |
505 | spin_unlock(&ubi->volumes_lock); | |
506 | } | |
507 | ||
4946784b RW |
508 | /* |
509 | * When we shrink a volume we have to flush all pending (erase) work. | |
510 | * Otherwise it can happen that upon next attach UBI finds a LEB with | |
511 | * lnum > highest_lnum and refuses to attach. | |
512 | */ | |
513 | if (pebs < 0) { | |
514 | err = ubi_wl_flush(ubi, vol_id, UBI_ALL); | |
515 | if (err) | |
516 | goto out_acc; | |
517 | } | |
518 | ||
519 | /* Change volume table record */ | |
520 | vtbl_rec = ubi->vtbl[vol_id]; | |
521 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); | |
522 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
523 | if (err) | |
524 | goto out_acc; | |
525 | ||
801c135c AB |
526 | vol->reserved_pebs = reserved_pebs; |
527 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
528 | vol->used_ebs = reserved_pebs; | |
529 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
530 | vol->used_bytes = |
531 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
532 | } |
533 | ||
0e0ee1cc | 534 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED); |
7bf523ae | 535 | self_check_volumes(ubi); |
c8566350 | 536 | return err; |
801c135c AB |
537 | |
538 | out_acc: | |
539 | if (pebs > 0) { | |
540 | spin_lock(&ubi->volumes_lock); | |
541 | ubi->rsvd_pebs -= pebs; | |
542 | ubi->avail_pebs += pebs; | |
543 | spin_unlock(&ubi->volumes_lock); | |
544 | } | |
545 | out_free: | |
546 | kfree(new_mapping); | |
547 | return err; | |
548 | } | |
549 | ||
f40ac9cd AB |
550 | /** |
551 | * ubi_rename_volumes - re-name UBI volumes. | |
552 | * @ubi: UBI device description object | |
ebaaf1af | 553 | * @rename_list: list of &struct ubi_rename_entry objects |
f40ac9cd AB |
554 | * |
555 | * This function re-names or removes volumes specified in the re-name list. | |
556 | * Returns zero in case of success and a negative error code in case of | |
557 | * failure. | |
558 | */ | |
559 | int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) | |
560 | { | |
561 | int err; | |
562 | struct ubi_rename_entry *re; | |
563 | ||
564 | err = ubi_vtbl_rename_volumes(ubi, rename_list); | |
565 | if (err) | |
566 | return err; | |
567 | ||
568 | list_for_each_entry(re, rename_list, list) { | |
569 | if (re->remove) { | |
570 | err = ubi_remove_volume(re->desc, 1); | |
571 | if (err) | |
572 | break; | |
573 | } else { | |
574 | struct ubi_volume *vol = re->desc->vol; | |
575 | ||
576 | spin_lock(&ubi->volumes_lock); | |
577 | vol->name_len = re->new_name_len; | |
578 | memcpy(vol->name, re->new_name, re->new_name_len + 1); | |
579 | spin_unlock(&ubi->volumes_lock); | |
0e0ee1cc | 580 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED); |
f40ac9cd AB |
581 | } |
582 | } | |
583 | ||
7bf523ae AB |
584 | if (!err) |
585 | self_check_volumes(ubi); | |
f40ac9cd AB |
586 | return err; |
587 | } | |
588 | ||
801c135c AB |
589 | /** |
590 | * ubi_add_volume - add volume. | |
591 | * @ubi: UBI device description object | |
89b96b69 | 592 | * @vol: volume description object |
801c135c | 593 | * |
d05c77a8 AB |
594 | * This function adds an existing volume and initializes all its data |
595 | * structures. Returns zero in case of success and a negative error code in | |
801c135c AB |
596 | * case of failure. |
597 | */ | |
89b96b69 | 598 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 599 | { |
89b96b69 | 600 | int err, vol_id = vol->vol_id; |
49dfc299 | 601 | dev_t dev; |
801c135c | 602 | |
c8566350 | 603 | dbg_gen("add volume %d", vol_id); |
801c135c AB |
604 | |
605 | /* Register character device for the volume */ | |
606 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
607 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
608 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
609 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 610 | if (err) { |
32608703 | 611 | ubi_err(ubi, "cannot add character device for volume %d, error %d", |
01f7b309 | 612 | vol_id, err); |
801c135c AB |
613 | return err; |
614 | } | |
615 | ||
801c135c AB |
616 | vol->dev.release = vol_release; |
617 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 618 | vol->dev.devt = dev; |
53cd255c TI |
619 | vol->dev.class = &ubi_class; |
620 | vol->dev.groups = volume_dev_groups; | |
475b44c1 | 621 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c AB |
622 | err = device_register(&vol->dev); |
623 | if (err) | |
518ceef0 | 624 | goto out_cdev; |
801c135c | 625 | |
7bf523ae | 626 | self_check_volumes(ubi); |
c8566350 | 627 | return err; |
801c135c | 628 | |
801c135c AB |
629 | out_cdev: |
630 | cdev_del(&vol->cdev); | |
631 | return err; | |
632 | } | |
633 | ||
634 | /** | |
635 | * ubi_free_volume - free volume. | |
636 | * @ubi: UBI device description object | |
89b96b69 | 637 | * @vol: volume description object |
801c135c | 638 | * |
89b96b69 | 639 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
640 | * Used only when the UBI device is detached. |
641 | */ | |
89b96b69 | 642 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 643 | { |
c8566350 | 644 | dbg_gen("free volume %d", vol->vol_id); |
801c135c | 645 | |
89b96b69 | 646 | ubi->volumes[vol->vol_id] = NULL; |
801c135c | 647 | cdev_del(&vol->cdev); |
53cd255c | 648 | device_unregister(&vol->dev); |
801c135c AB |
649 | } |
650 | ||
801c135c | 651 | /** |
7bf523ae | 652 | * self_check_volume - check volume information. |
801c135c AB |
653 | * @ubi: UBI device description object |
654 | * @vol_id: volume ID | |
c8566350 AB |
655 | * |
656 | * Returns zero if volume is all right and a a negative error code if not. | |
801c135c | 657 | */ |
7bf523ae | 658 | static int self_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
659 | { |
660 | int idx = vol_id2idx(ubi, vol_id); | |
661 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 662 | const struct ubi_volume *vol; |
801c135c AB |
663 | long long n; |
664 | const char *name; | |
665 | ||
b89044bf | 666 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 667 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 668 | vol = ubi->volumes[idx]; |
801c135c AB |
669 | |
670 | if (!vol) { | |
671 | if (reserved_pebs) { | |
32608703 | 672 | ubi_err(ubi, "no volume info, but volume exists"); |
801c135c AB |
673 | goto fail; |
674 | } | |
b89044bf | 675 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 676 | return 0; |
801c135c AB |
677 | } |
678 | ||
679 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
680 | vol->name_len < 0) { | |
32608703 | 681 | ubi_err(ubi, "negative values"); |
801c135c AB |
682 | goto fail; |
683 | } | |
684 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
32608703 | 685 | ubi_err(ubi, "bad alignment"); |
801c135c AB |
686 | goto fail; |
687 | } | |
688 | ||
cadb40cc | 689 | n = vol->alignment & (ubi->min_io_size - 1); |
801c135c | 690 | if (vol->alignment != 1 && n) { |
32608703 | 691 | ubi_err(ubi, "alignment is not multiple of min I/O unit"); |
801c135c AB |
692 | goto fail; |
693 | } | |
694 | ||
695 | n = ubi->leb_size % vol->alignment; | |
696 | if (vol->data_pad != n) { | |
32608703 | 697 | ubi_err(ubi, "bad data_pad, has to be %lld", n); |
801c135c AB |
698 | goto fail; |
699 | } | |
700 | ||
701 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
702 | vol->vol_type != UBI_STATIC_VOLUME) { | |
32608703 | 703 | ubi_err(ubi, "bad vol_type"); |
801c135c AB |
704 | goto fail; |
705 | } | |
706 | ||
801c135c | 707 | if (vol->upd_marker && vol->corrupted) { |
32608703 | 708 | ubi_err(ubi, "update marker and corrupted simultaneously"); |
801c135c AB |
709 | goto fail; |
710 | } | |
711 | ||
712 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
32608703 | 713 | ubi_err(ubi, "too large reserved_pebs"); |
801c135c AB |
714 | goto fail; |
715 | } | |
716 | ||
717 | n = ubi->leb_size - vol->data_pad; | |
718 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
32608703 | 719 | ubi_err(ubi, "bad usable_leb_size, has to be %lld", n); |
801c135c AB |
720 | goto fail; |
721 | } | |
722 | ||
723 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
32608703 TB |
724 | ubi_err(ubi, "too long volume name, max is %d", |
725 | UBI_VOL_NAME_MAX); | |
801c135c AB |
726 | goto fail; |
727 | } | |
728 | ||
801c135c AB |
729 | n = strnlen(vol->name, vol->name_len + 1); |
730 | if (n != vol->name_len) { | |
32608703 | 731 | ubi_err(ubi, "bad name_len %lld", n); |
801c135c AB |
732 | goto fail; |
733 | } | |
734 | ||
d08c3b78 | 735 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c | 736 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
896c0c06 | 737 | if (vol->corrupted) { |
32608703 | 738 | ubi_err(ubi, "corrupted dynamic volume"); |
801c135c AB |
739 | goto fail; |
740 | } | |
741 | if (vol->used_ebs != vol->reserved_pebs) { | |
32608703 | 742 | ubi_err(ubi, "bad used_ebs"); |
801c135c AB |
743 | goto fail; |
744 | } | |
745 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
32608703 | 746 | ubi_err(ubi, "bad last_eb_bytes"); |
801c135c AB |
747 | goto fail; |
748 | } | |
749 | if (vol->used_bytes != n) { | |
32608703 | 750 | ubi_err(ubi, "bad used_bytes"); |
801c135c AB |
751 | goto fail; |
752 | } | |
753 | } else { | |
801c135c | 754 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
32608703 | 755 | ubi_err(ubi, "bad used_ebs"); |
801c135c AB |
756 | goto fail; |
757 | } | |
758 | if (vol->last_eb_bytes < 0 || | |
759 | vol->last_eb_bytes > vol->usable_leb_size) { | |
32608703 | 760 | ubi_err(ubi, "bad last_eb_bytes"); |
801c135c AB |
761 | goto fail; |
762 | } | |
763 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
764 | vol->used_bytes < n - vol->usable_leb_size) { | |
32608703 | 765 | ubi_err(ubi, "bad used_bytes"); |
801c135c AB |
766 | goto fail; |
767 | } | |
768 | } | |
769 | ||
3261ebd7 CH |
770 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
771 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
772 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); | |
801c135c AB |
773 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
774 | name = &ubi->vtbl[vol_id].name[0]; | |
775 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
776 | vol_type = UBI_DYNAMIC_VOLUME; | |
777 | else | |
778 | vol_type = UBI_STATIC_VOLUME; | |
779 | ||
780 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
781 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
9c9ec147 | 782 | name_len != vol->name_len || strncmp(name, vol->name, name_len)) { |
32608703 | 783 | ubi_err(ubi, "volume info is different"); |
801c135c AB |
784 | goto fail; |
785 | } | |
786 | ||
b89044bf | 787 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 788 | return 0; |
801c135c AB |
789 | |
790 | fail: | |
32608703 | 791 | ubi_err(ubi, "self-check failed for volume %d", vol_id); |
f40ac9cd | 792 | if (vol) |
766381f0 | 793 | ubi_dump_vol_info(vol); |
1f021e1d | 794 | ubi_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
cfcf0ec8 | 795 | dump_stack(); |
b89044bf | 796 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 797 | return -EINVAL; |
801c135c AB |
798 | } |
799 | ||
800 | /** | |
7bf523ae | 801 | * self_check_volumes - check information about all volumes. |
801c135c | 802 | * @ubi: UBI device description object |
c8566350 AB |
803 | * |
804 | * Returns zero if volumes are all right and a a negative error code if not. | |
801c135c | 805 | */ |
7bf523ae | 806 | static int self_check_volumes(struct ubi_device *ubi) |
801c135c | 807 | { |
c8566350 | 808 | int i, err = 0; |
801c135c | 809 | |
64575574 | 810 | if (!ubi_dbg_chk_gen(ubi)) |
92d124f5 AB |
811 | return 0; |
812 | ||
c8566350 | 813 | for (i = 0; i < ubi->vtbl_slots; i++) { |
7bf523ae | 814 | err = self_check_volume(ubi, i); |
c8566350 AB |
815 | if (err) |
816 | break; | |
817 | } | |
818 | ||
819 | return err; | |
801c135c | 820 | } |