Commit | Line | Data |
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801c135c AB |
1 | /* |
2 | * Copyright (c) International Business Machines Corp., 2006 | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
12 | * the GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | * | |
18 | * Author: Artem Bityutskiy (Битюцкий Артём) | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This file contains implementation of volume creation, deletion, updating and | |
23 | * resizing. | |
24 | */ | |
25 | ||
26 | #include <linux/err.h> | |
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 | ||
123 | /* Release method for volume devices */ | |
124 | static void vol_release(struct device *dev) | |
125 | { | |
126 | struct ubi_volume *vol = container_of(dev, struct ubi_volume, dev); | |
732aeacf | 127 | |
abc5e922 | 128 | kfree(vol->eba_tbl); |
801c135c AB |
129 | kfree(vol); |
130 | } | |
131 | ||
132 | /** | |
133 | * volume_sysfs_init - initialize sysfs for new volume. | |
134 | * @ubi: UBI device description object | |
135 | * @vol: volume description object | |
136 | * | |
137 | * This function returns zero in case of success and a negative error code in | |
138 | * case of failure. | |
139 | * | |
140 | * Note, this function does not free allocated resources in case of failure - | |
141 | * the caller does it. This is because this would cause release() here and the | |
142 | * caller would oops. | |
143 | */ | |
144 | static int volume_sysfs_init(struct ubi_device *ubi, struct ubi_volume *vol) | |
145 | { | |
146 | int err; | |
147 | ||
8bc22961 | 148 | err = device_create_file(&vol->dev, &attr_vol_reserved_ebs); |
801c135c AB |
149 | if (err) |
150 | return err; | |
8bc22961 | 151 | err = device_create_file(&vol->dev, &attr_vol_type); |
801c135c AB |
152 | if (err) |
153 | return err; | |
8bc22961 | 154 | err = device_create_file(&vol->dev, &attr_vol_name); |
801c135c AB |
155 | if (err) |
156 | return err; | |
8bc22961 | 157 | err = device_create_file(&vol->dev, &attr_vol_corrupted); |
801c135c AB |
158 | if (err) |
159 | return err; | |
8bc22961 | 160 | err = device_create_file(&vol->dev, &attr_vol_alignment); |
801c135c AB |
161 | if (err) |
162 | return err; | |
8bc22961 | 163 | err = device_create_file(&vol->dev, &attr_vol_usable_eb_size); |
801c135c AB |
164 | if (err) |
165 | return err; | |
8bc22961 | 166 | err = device_create_file(&vol->dev, &attr_vol_data_bytes); |
801c135c AB |
167 | if (err) |
168 | return err; | |
8bc22961 | 169 | err = device_create_file(&vol->dev, &attr_vol_upd_marker); |
fc75a1e1 | 170 | return err; |
801c135c AB |
171 | } |
172 | ||
173 | /** | |
174 | * volume_sysfs_close - close sysfs for a volume. | |
175 | * @vol: volume description object | |
176 | */ | |
177 | static void volume_sysfs_close(struct ubi_volume *vol) | |
178 | { | |
8bc22961 AB |
179 | device_remove_file(&vol->dev, &attr_vol_upd_marker); |
180 | device_remove_file(&vol->dev, &attr_vol_data_bytes); | |
181 | device_remove_file(&vol->dev, &attr_vol_usable_eb_size); | |
182 | device_remove_file(&vol->dev, &attr_vol_alignment); | |
183 | device_remove_file(&vol->dev, &attr_vol_corrupted); | |
184 | device_remove_file(&vol->dev, &attr_vol_name); | |
185 | device_remove_file(&vol->dev, &attr_vol_type); | |
186 | device_remove_file(&vol->dev, &attr_vol_reserved_ebs); | |
801c135c AB |
187 | device_unregister(&vol->dev); |
188 | } | |
189 | ||
190 | /** | |
191 | * ubi_create_volume - create volume. | |
192 | * @ubi: UBI device description object | |
193 | * @req: volume creation request | |
194 | * | |
195 | * This function creates volume described by @req. If @req->vol_id id | |
d05c77a8 | 196 | * %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume |
801c135c | 197 | * and saves it in @req->vol_id. Returns zero in case of success and a negative |
40e4d0c1 | 198 | * error code in case of failure. Note, the caller has to have the |
f089c0b2 | 199 | * @ubi->device_mutex locked. |
801c135c AB |
200 | */ |
201 | int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) | |
202 | { | |
abc5e922 | 203 | int i, err, vol_id = req->vol_id, do_free = 1; |
801c135c AB |
204 | struct ubi_volume *vol; |
205 | struct ubi_vtbl_record vtbl_rec; | |
49dfc299 | 206 | dev_t dev; |
801c135c AB |
207 | |
208 | if (ubi->ro_mode) | |
209 | return -EROFS; | |
210 | ||
211 | vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL); | |
212 | if (!vol) | |
213 | return -ENOMEM; | |
214 | ||
215 | spin_lock(&ubi->volumes_lock); | |
801c135c AB |
216 | if (vol_id == UBI_VOL_NUM_AUTO) { |
217 | /* Find unused volume ID */ | |
c8566350 | 218 | dbg_gen("search for vacant volume ID"); |
801c135c AB |
219 | for (i = 0; i < ubi->vtbl_slots; i++) |
220 | if (!ubi->volumes[i]) { | |
221 | vol_id = i; | |
222 | break; | |
223 | } | |
224 | ||
225 | if (vol_id == UBI_VOL_NUM_AUTO) { | |
e2986827 | 226 | ubi_err("out of volume IDs"); |
801c135c AB |
227 | err = -ENFILE; |
228 | goto out_unlock; | |
229 | } | |
230 | req->vol_id = vol_id; | |
231 | } | |
232 | ||
e1cf7e6d AB |
233 | dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s", |
234 | ubi->ubi_num, vol_id, (unsigned long long)req->bytes, | |
801c135c AB |
235 | (int)req->vol_type, req->name); |
236 | ||
237 | /* Ensure that this volume does not exist */ | |
238 | err = -EEXIST; | |
239 | if (ubi->volumes[vol_id]) { | |
e2986827 | 240 | ubi_err("volume %d already exists", vol_id); |
801c135c AB |
241 | goto out_unlock; |
242 | } | |
243 | ||
244 | /* Ensure that the name is unique */ | |
245 | for (i = 0; i < ubi->vtbl_slots; i++) | |
246 | if (ubi->volumes[i] && | |
247 | ubi->volumes[i]->name_len == req->name_len && | |
94784d91 | 248 | !strcmp(ubi->volumes[i]->name, req->name)) { |
e2986827 | 249 | ubi_err("volume \"%s\" exists (ID %d)", req->name, i); |
801c135c AB |
250 | goto out_unlock; |
251 | } | |
252 | ||
9c9ec147 | 253 | /* Calculate how many eraseblocks are requested */ |
801c135c | 254 | vol->usable_leb_size = ubi->leb_size - ubi->leb_size % req->alignment; |
3013ee31 AB |
255 | vol->reserved_pebs += div_u64(req->bytes + vol->usable_leb_size - 1, |
256 | vol->usable_leb_size); | |
801c135c AB |
257 | |
258 | /* Reserve physical eraseblocks */ | |
259 | if (vol->reserved_pebs > ubi->avail_pebs) { | |
e2986827 | 260 | ubi_err("not enough PEBs, only %d available", ubi->avail_pebs); |
5fc01ab6 | 261 | if (ubi->corr_peb_count) |
e2986827 | 262 | ubi_err("%d PEBs are corrupted and not used", |
5fc01ab6 | 263 | ubi->corr_peb_count); |
801c135c AB |
264 | err = -ENOSPC; |
265 | goto out_unlock; | |
266 | } | |
267 | ubi->avail_pebs -= vol->reserved_pebs; | |
268 | ubi->rsvd_pebs += vol->reserved_pebs; | |
e73f4459 | 269 | spin_unlock(&ubi->volumes_lock); |
801c135c AB |
270 | |
271 | vol->vol_id = vol_id; | |
272 | vol->alignment = req->alignment; | |
273 | vol->data_pad = ubi->leb_size % vol->alignment; | |
274 | vol->vol_type = req->vol_type; | |
275 | vol->name_len = req->name_len; | |
a6ea4407 | 276 | memcpy(vol->name, req->name, vol->name_len); |
801c135c | 277 | vol->ubi = ubi; |
801c135c AB |
278 | |
279 | /* | |
280 | * Finish all pending erases because there may be some LEBs belonging | |
281 | * to the same volume ID. | |
282 | */ | |
62f38455 | 283 | err = ubi_wl_flush(ubi, vol_id, UBI_ALL); |
801c135c AB |
284 | if (err) |
285 | goto out_acc; | |
286 | ||
287 | vol->eba_tbl = kmalloc(vol->reserved_pebs * sizeof(int), GFP_KERNEL); | |
288 | if (!vol->eba_tbl) { | |
289 | err = -ENOMEM; | |
290 | goto out_acc; | |
291 | } | |
292 | ||
293 | for (i = 0; i < vol->reserved_pebs; i++) | |
294 | vol->eba_tbl[i] = UBI_LEB_UNMAPPED; | |
295 | ||
296 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
297 | vol->used_ebs = vol->reserved_pebs; | |
298 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
299 | vol->used_bytes = |
300 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c | 301 | } else { |
3013ee31 AB |
302 | vol->used_ebs = div_u64_rem(vol->used_bytes, |
303 | vol->usable_leb_size, | |
304 | &vol->last_eb_bytes); | |
305 | if (vol->last_eb_bytes != 0) | |
801c135c AB |
306 | vol->used_ebs += 1; |
307 | else | |
308 | vol->last_eb_bytes = vol->usable_leb_size; | |
309 | } | |
310 | ||
311 | /* Register character device for the volume */ | |
312 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
313 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
314 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol_id + 1); |
315 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 316 | if (err) { |
01f7b309 | 317 | ubi_err("cannot add character device"); |
801c135c AB |
318 | goto out_mapping; |
319 | } | |
320 | ||
801c135c AB |
321 | vol->dev.release = vol_release; |
322 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 323 | vol->dev.devt = dev; |
801c135c | 324 | vol->dev.class = ubi_class; |
fc75a1e1 | 325 | |
475b44c1 | 326 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c | 327 | err = device_register(&vol->dev); |
01f7b309 AB |
328 | if (err) { |
329 | ubi_err("cannot register device"); | |
518ceef0 | 330 | goto out_cdev; |
01f7b309 | 331 | } |
801c135c AB |
332 | |
333 | err = volume_sysfs_init(ubi, vol); | |
334 | if (err) | |
335 | goto out_sysfs; | |
336 | ||
337 | /* Fill volume table record */ | |
338 | memset(&vtbl_rec, 0, sizeof(struct ubi_vtbl_record)); | |
3261ebd7 CH |
339 | vtbl_rec.reserved_pebs = cpu_to_be32(vol->reserved_pebs); |
340 | vtbl_rec.alignment = cpu_to_be32(vol->alignment); | |
341 | vtbl_rec.data_pad = cpu_to_be32(vol->data_pad); | |
342 | vtbl_rec.name_len = cpu_to_be16(vol->name_len); | |
801c135c AB |
343 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) |
344 | vtbl_rec.vol_type = UBI_VID_DYNAMIC; | |
345 | else | |
346 | vtbl_rec.vol_type = UBI_VID_STATIC; | |
a6ea4407 | 347 | memcpy(vtbl_rec.name, vol->name, vol->name_len); |
801c135c AB |
348 | |
349 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
350 | if (err) | |
351 | goto out_sysfs; | |
352 | ||
353 | spin_lock(&ubi->volumes_lock); | |
d05c77a8 | 354 | ubi->volumes[vol_id] = vol; |
4b3cc340 | 355 | ubi->vol_count += 1; |
801c135c AB |
356 | spin_unlock(&ubi->volumes_lock); |
357 | ||
0e0ee1cc | 358 | ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED); |
7bf523ae | 359 | self_check_volumes(ubi); |
c8566350 | 360 | return err; |
801c135c | 361 | |
fc75a1e1 AB |
362 | out_sysfs: |
363 | /* | |
abc5e922 | 364 | * We have registered our device, we should not free the volume |
fc75a1e1 AB |
365 | * description object in this function in case of an error - it is |
366 | * freed by the release function. | |
367 | * | |
368 | * Get device reference to prevent the release function from being | |
369 | * called just after sysfs has been closed. | |
370 | */ | |
abc5e922 | 371 | do_free = 0; |
fc75a1e1 AB |
372 | get_device(&vol->dev); |
373 | volume_sysfs_close(vol); | |
801c135c AB |
374 | out_cdev: |
375 | cdev_del(&vol->cdev); | |
376 | out_mapping: | |
abc5e922 AB |
377 | if (do_free) |
378 | kfree(vol->eba_tbl); | |
801c135c AB |
379 | out_acc: |
380 | spin_lock(&ubi->volumes_lock); | |
381 | ubi->rsvd_pebs -= vol->reserved_pebs; | |
382 | ubi->avail_pebs += vol->reserved_pebs; | |
383 | out_unlock: | |
384 | spin_unlock(&ubi->volumes_lock); | |
abc5e922 | 385 | if (do_free) |
fc75a1e1 | 386 | kfree(vol); |
abc5e922 AB |
387 | else |
388 | put_device(&vol->dev); | |
01f7b309 | 389 | ubi_err("cannot create volume %d, error %d", vol_id, err); |
801c135c AB |
390 | return err; |
391 | } | |
392 | ||
393 | /** | |
394 | * ubi_remove_volume - remove volume. | |
395 | * @desc: volume descriptor | |
f40ac9cd | 396 | * @no_vtbl: do not change volume table if not zero |
801c135c AB |
397 | * |
398 | * This function removes volume described by @desc. The volume has to be opened | |
399 | * in "exclusive" mode. Returns zero in case of success and a negative error | |
f089c0b2 | 400 | * code in case of failure. The caller has to have the @ubi->device_mutex |
40e4d0c1 | 401 | * locked. |
801c135c | 402 | */ |
f40ac9cd | 403 | int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl) |
801c135c AB |
404 | { |
405 | struct ubi_volume *vol = desc->vol; | |
406 | struct ubi_device *ubi = vol->ubi; | |
407 | int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs; | |
408 | ||
e1cf7e6d | 409 | dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id); |
801c135c AB |
410 | ubi_assert(desc->mode == UBI_EXCLUSIVE); |
411 | ubi_assert(vol == ubi->volumes[vol_id]); | |
412 | ||
413 | if (ubi->ro_mode) | |
414 | return -EROFS; | |
415 | ||
d05c77a8 AB |
416 | spin_lock(&ubi->volumes_lock); |
417 | if (vol->ref_count > 1) { | |
418 | /* | |
419 | * The volume is busy, probably someone is reading one of its | |
420 | * sysfs files. | |
421 | */ | |
422 | err = -EBUSY; | |
423 | goto out_unlock; | |
424 | } | |
425 | ubi->volumes[vol_id] = NULL; | |
426 | spin_unlock(&ubi->volumes_lock); | |
427 | ||
f40ac9cd AB |
428 | if (!no_vtbl) { |
429 | err = ubi_change_vtbl_record(ubi, vol_id, NULL); | |
430 | if (err) | |
431 | goto out_err; | |
432 | } | |
801c135c AB |
433 | |
434 | for (i = 0; i < vol->reserved_pebs; i++) { | |
89b96b69 | 435 | err = ubi_eba_unmap_leb(ubi, vol, i); |
801c135c | 436 | if (err) |
d05c77a8 | 437 | goto out_err; |
801c135c AB |
438 | } |
439 | ||
801c135c AB |
440 | cdev_del(&vol->cdev); |
441 | volume_sysfs_close(vol); | |
801c135c AB |
442 | |
443 | spin_lock(&ubi->volumes_lock); | |
444 | ubi->rsvd_pebs -= reserved_pebs; | |
445 | ubi->avail_pebs += reserved_pebs; | |
87e773c9 | 446 | ubi_update_reserved(ubi); |
801c135c AB |
447 | ubi->vol_count -= 1; |
448 | spin_unlock(&ubi->volumes_lock); | |
449 | ||
0e0ee1cc | 450 | ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED); |
7bf523ae AB |
451 | if (!no_vtbl) |
452 | self_check_volumes(ubi); | |
d38dce5b | 453 | |
c8566350 | 454 | return err; |
d05c77a8 AB |
455 | |
456 | out_err: | |
457 | ubi_err("cannot remove volume %d, error %d", vol_id, err); | |
458 | spin_lock(&ubi->volumes_lock); | |
459 | ubi->volumes[vol_id] = vol; | |
460 | out_unlock: | |
461 | spin_unlock(&ubi->volumes_lock); | |
cae0a771 | 462 | return err; |
801c135c AB |
463 | } |
464 | ||
465 | /** | |
466 | * ubi_resize_volume - re-size volume. | |
467 | * @desc: volume descriptor | |
468 | * @reserved_pebs: new size in physical eraseblocks | |
469 | * | |
40e4d0c1 AB |
470 | * This function re-sizes the volume and returns zero in case of success, and a |
471 | * negative error code in case of failure. The caller has to have the | |
f089c0b2 | 472 | * @ubi->device_mutex locked. |
801c135c AB |
473 | */ |
474 | int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs) | |
475 | { | |
476 | int i, err, pebs, *new_mapping; | |
477 | struct ubi_volume *vol = desc->vol; | |
478 | struct ubi_device *ubi = vol->ubi; | |
479 | struct ubi_vtbl_record vtbl_rec; | |
480 | int vol_id = vol->vol_id; | |
481 | ||
482 | if (ubi->ro_mode) | |
483 | return -EROFS; | |
484 | ||
e1cf7e6d AB |
485 | dbg_gen("re-size device %d, volume %d to from %d to %d PEBs", |
486 | ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs); | |
801c135c AB |
487 | |
488 | if (vol->vol_type == UBI_STATIC_VOLUME && | |
489 | reserved_pebs < vol->used_ebs) { | |
e2986827 | 490 | ubi_err("too small size %d, %d LEBs contain data", |
801c135c AB |
491 | reserved_pebs, vol->used_ebs); |
492 | return -EINVAL; | |
493 | } | |
494 | ||
495 | /* If the size is the same, we have nothing to do */ | |
496 | if (reserved_pebs == vol->reserved_pebs) | |
497 | return 0; | |
498 | ||
499 | new_mapping = kmalloc(reserved_pebs * sizeof(int), GFP_KERNEL); | |
500 | if (!new_mapping) | |
501 | return -ENOMEM; | |
502 | ||
503 | for (i = 0; i < reserved_pebs; i++) | |
504 | new_mapping[i] = UBI_LEB_UNMAPPED; | |
505 | ||
d05c77a8 AB |
506 | spin_lock(&ubi->volumes_lock); |
507 | if (vol->ref_count > 1) { | |
508 | spin_unlock(&ubi->volumes_lock); | |
509 | err = -EBUSY; | |
510 | goto out_free; | |
511 | } | |
512 | spin_unlock(&ubi->volumes_lock); | |
513 | ||
d05c77a8 | 514 | /* Reserve physical eraseblocks */ |
801c135c AB |
515 | pebs = reserved_pebs - vol->reserved_pebs; |
516 | if (pebs > 0) { | |
517 | spin_lock(&ubi->volumes_lock); | |
518 | if (pebs > ubi->avail_pebs) { | |
e2986827 | 519 | ubi_err("not enough PEBs: requested %d, available %d", |
801c135c | 520 | pebs, ubi->avail_pebs); |
5fc01ab6 | 521 | if (ubi->corr_peb_count) |
e2986827 | 522 | ubi_err("%d PEBs are corrupted and not used", |
5fc01ab6 | 523 | ubi->corr_peb_count); |
801c135c AB |
524 | spin_unlock(&ubi->volumes_lock); |
525 | err = -ENOSPC; | |
526 | goto out_free; | |
527 | } | |
528 | ubi->avail_pebs -= pebs; | |
529 | ubi->rsvd_pebs += pebs; | |
530 | for (i = 0; i < vol->reserved_pebs; i++) | |
531 | new_mapping[i] = vol->eba_tbl[i]; | |
532 | kfree(vol->eba_tbl); | |
533 | vol->eba_tbl = new_mapping; | |
534 | spin_unlock(&ubi->volumes_lock); | |
535 | } | |
536 | ||
801c135c AB |
537 | if (pebs < 0) { |
538 | for (i = 0; i < -pebs; i++) { | |
89b96b69 | 539 | err = ubi_eba_unmap_leb(ubi, vol, reserved_pebs + i); |
801c135c AB |
540 | if (err) |
541 | goto out_acc; | |
542 | } | |
543 | spin_lock(&ubi->volumes_lock); | |
544 | ubi->rsvd_pebs += pebs; | |
545 | ubi->avail_pebs -= pebs; | |
87e773c9 | 546 | ubi_update_reserved(ubi); |
801c135c AB |
547 | for (i = 0; i < reserved_pebs; i++) |
548 | new_mapping[i] = vol->eba_tbl[i]; | |
549 | kfree(vol->eba_tbl); | |
550 | vol->eba_tbl = new_mapping; | |
551 | spin_unlock(&ubi->volumes_lock); | |
552 | } | |
553 | ||
e66fa69e RW |
554 | /* |
555 | * When we shrink a volume we have to flush all pending (erase) work. | |
556 | * Otherwise it can happen that upon next attach UBI finds a LEB with | |
557 | * lnum > highest_lnum and refuses to attach. | |
558 | */ | |
559 | if (pebs < 0) { | |
560 | err = ubi_wl_flush(ubi, vol_id, UBI_ALL); | |
561 | if (err) | |
562 | goto out_acc; | |
563 | } | |
564 | ||
565 | /* Change volume table record */ | |
566 | vtbl_rec = ubi->vtbl[vol_id]; | |
567 | vtbl_rec.reserved_pebs = cpu_to_be32(reserved_pebs); | |
568 | err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); | |
569 | if (err) | |
570 | goto out_acc; | |
571 | ||
801c135c AB |
572 | vol->reserved_pebs = reserved_pebs; |
573 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { | |
574 | vol->used_ebs = reserved_pebs; | |
575 | vol->last_eb_bytes = vol->usable_leb_size; | |
d08c3b78 VA |
576 | vol->used_bytes = |
577 | (long long)vol->used_ebs * vol->usable_leb_size; | |
801c135c AB |
578 | } |
579 | ||
0e0ee1cc | 580 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED); |
7bf523ae | 581 | self_check_volumes(ubi); |
c8566350 | 582 | return err; |
801c135c AB |
583 | |
584 | out_acc: | |
585 | if (pebs > 0) { | |
586 | spin_lock(&ubi->volumes_lock); | |
587 | ubi->rsvd_pebs -= pebs; | |
588 | ubi->avail_pebs += pebs; | |
589 | spin_unlock(&ubi->volumes_lock); | |
590 | } | |
591 | out_free: | |
592 | kfree(new_mapping); | |
593 | return err; | |
594 | } | |
595 | ||
f40ac9cd AB |
596 | /** |
597 | * ubi_rename_volumes - re-name UBI volumes. | |
598 | * @ubi: UBI device description object | |
ebaaf1af | 599 | * @rename_list: list of &struct ubi_rename_entry objects |
f40ac9cd AB |
600 | * |
601 | * This function re-names or removes volumes specified in the re-name list. | |
602 | * Returns zero in case of success and a negative error code in case of | |
603 | * failure. | |
604 | */ | |
605 | int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list) | |
606 | { | |
607 | int err; | |
608 | struct ubi_rename_entry *re; | |
609 | ||
610 | err = ubi_vtbl_rename_volumes(ubi, rename_list); | |
611 | if (err) | |
612 | return err; | |
613 | ||
614 | list_for_each_entry(re, rename_list, list) { | |
615 | if (re->remove) { | |
616 | err = ubi_remove_volume(re->desc, 1); | |
617 | if (err) | |
618 | break; | |
619 | } else { | |
620 | struct ubi_volume *vol = re->desc->vol; | |
621 | ||
622 | spin_lock(&ubi->volumes_lock); | |
623 | vol->name_len = re->new_name_len; | |
624 | memcpy(vol->name, re->new_name, re->new_name_len + 1); | |
625 | spin_unlock(&ubi->volumes_lock); | |
0e0ee1cc | 626 | ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED); |
f40ac9cd AB |
627 | } |
628 | } | |
629 | ||
7bf523ae AB |
630 | if (!err) |
631 | self_check_volumes(ubi); | |
f40ac9cd AB |
632 | return err; |
633 | } | |
634 | ||
801c135c AB |
635 | /** |
636 | * ubi_add_volume - add volume. | |
637 | * @ubi: UBI device description object | |
89b96b69 | 638 | * @vol: volume description object |
801c135c | 639 | * |
d05c77a8 AB |
640 | * This function adds an existing volume and initializes all its data |
641 | * structures. Returns zero in case of success and a negative error code in | |
801c135c AB |
642 | * case of failure. |
643 | */ | |
89b96b69 | 644 | int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 645 | { |
89b96b69 | 646 | int err, vol_id = vol->vol_id; |
49dfc299 | 647 | dev_t dev; |
801c135c | 648 | |
c8566350 | 649 | dbg_gen("add volume %d", vol_id); |
801c135c AB |
650 | |
651 | /* Register character device for the volume */ | |
652 | cdev_init(&vol->cdev, &ubi_vol_cdev_operations); | |
653 | vol->cdev.owner = THIS_MODULE; | |
49dfc299 AB |
654 | dev = MKDEV(MAJOR(ubi->cdev.dev), vol->vol_id + 1); |
655 | err = cdev_add(&vol->cdev, dev, 1); | |
801c135c | 656 | if (err) { |
01f7b309 AB |
657 | ubi_err("cannot add character device for volume %d, error %d", |
658 | vol_id, err); | |
801c135c AB |
659 | return err; |
660 | } | |
661 | ||
801c135c AB |
662 | vol->dev.release = vol_release; |
663 | vol->dev.parent = &ubi->dev; | |
49dfc299 | 664 | vol->dev.devt = dev; |
801c135c | 665 | vol->dev.class = ubi_class; |
475b44c1 | 666 | dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id); |
801c135c AB |
667 | err = device_register(&vol->dev); |
668 | if (err) | |
518ceef0 | 669 | goto out_cdev; |
801c135c AB |
670 | |
671 | err = volume_sysfs_init(ubi, vol); | |
672 | if (err) { | |
673 | cdev_del(&vol->cdev); | |
801c135c AB |
674 | volume_sysfs_close(vol); |
675 | return err; | |
676 | } | |
677 | ||
7bf523ae | 678 | self_check_volumes(ubi); |
c8566350 | 679 | return err; |
801c135c | 680 | |
801c135c AB |
681 | out_cdev: |
682 | cdev_del(&vol->cdev); | |
683 | return err; | |
684 | } | |
685 | ||
686 | /** | |
687 | * ubi_free_volume - free volume. | |
688 | * @ubi: UBI device description object | |
89b96b69 | 689 | * @vol: volume description object |
801c135c | 690 | * |
89b96b69 | 691 | * This function frees all resources for volume @vol but does not remove it. |
801c135c AB |
692 | * Used only when the UBI device is detached. |
693 | */ | |
89b96b69 | 694 | void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol) |
801c135c | 695 | { |
c8566350 | 696 | dbg_gen("free volume %d", vol->vol_id); |
801c135c | 697 | |
89b96b69 | 698 | ubi->volumes[vol->vol_id] = NULL; |
801c135c AB |
699 | cdev_del(&vol->cdev); |
700 | volume_sysfs_close(vol); | |
701 | } | |
702 | ||
801c135c | 703 | /** |
7bf523ae | 704 | * self_check_volume - check volume information. |
801c135c AB |
705 | * @ubi: UBI device description object |
706 | * @vol_id: volume ID | |
c8566350 AB |
707 | * |
708 | * Returns zero if volume is all right and a a negative error code if not. | |
801c135c | 709 | */ |
7bf523ae | 710 | static int self_check_volume(struct ubi_device *ubi, int vol_id) |
801c135c AB |
711 | { |
712 | int idx = vol_id2idx(ubi, vol_id); | |
713 | int reserved_pebs, alignment, data_pad, vol_type, name_len, upd_marker; | |
b89044bf | 714 | const struct ubi_volume *vol; |
801c135c AB |
715 | long long n; |
716 | const char *name; | |
717 | ||
b89044bf | 718 | spin_lock(&ubi->volumes_lock); |
3261ebd7 | 719 | reserved_pebs = be32_to_cpu(ubi->vtbl[vol_id].reserved_pebs); |
b89044bf | 720 | vol = ubi->volumes[idx]; |
801c135c AB |
721 | |
722 | if (!vol) { | |
723 | if (reserved_pebs) { | |
724 | ubi_err("no volume info, but volume exists"); | |
725 | goto fail; | |
726 | } | |
b89044bf | 727 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 728 | return 0; |
801c135c AB |
729 | } |
730 | ||
731 | if (vol->reserved_pebs < 0 || vol->alignment < 0 || vol->data_pad < 0 || | |
732 | vol->name_len < 0) { | |
733 | ubi_err("negative values"); | |
734 | goto fail; | |
735 | } | |
736 | if (vol->alignment > ubi->leb_size || vol->alignment == 0) { | |
737 | ubi_err("bad alignment"); | |
738 | goto fail; | |
739 | } | |
740 | ||
cadb40cc | 741 | n = vol->alignment & (ubi->min_io_size - 1); |
801c135c AB |
742 | if (vol->alignment != 1 && n) { |
743 | ubi_err("alignment is not multiple of min I/O unit"); | |
744 | goto fail; | |
745 | } | |
746 | ||
747 | n = ubi->leb_size % vol->alignment; | |
748 | if (vol->data_pad != n) { | |
749 | ubi_err("bad data_pad, has to be %lld", n); | |
750 | goto fail; | |
751 | } | |
752 | ||
753 | if (vol->vol_type != UBI_DYNAMIC_VOLUME && | |
754 | vol->vol_type != UBI_STATIC_VOLUME) { | |
755 | ubi_err("bad vol_type"); | |
756 | goto fail; | |
757 | } | |
758 | ||
801c135c | 759 | if (vol->upd_marker && vol->corrupted) { |
e2986827 | 760 | ubi_err("update marker and corrupted simultaneously"); |
801c135c AB |
761 | goto fail; |
762 | } | |
763 | ||
764 | if (vol->reserved_pebs > ubi->good_peb_count) { | |
765 | ubi_err("too large reserved_pebs"); | |
766 | goto fail; | |
767 | } | |
768 | ||
769 | n = ubi->leb_size - vol->data_pad; | |
770 | if (vol->usable_leb_size != ubi->leb_size - vol->data_pad) { | |
771 | ubi_err("bad usable_leb_size, has to be %lld", n); | |
772 | goto fail; | |
773 | } | |
774 | ||
775 | if (vol->name_len > UBI_VOL_NAME_MAX) { | |
776 | ubi_err("too long volume name, max is %d", UBI_VOL_NAME_MAX); | |
777 | goto fail; | |
778 | } | |
779 | ||
801c135c AB |
780 | n = strnlen(vol->name, vol->name_len + 1); |
781 | if (n != vol->name_len) { | |
782 | ubi_err("bad name_len %lld", n); | |
783 | goto fail; | |
784 | } | |
785 | ||
d08c3b78 | 786 | n = (long long)vol->used_ebs * vol->usable_leb_size; |
801c135c | 787 | if (vol->vol_type == UBI_DYNAMIC_VOLUME) { |
896c0c06 | 788 | if (vol->corrupted) { |
801c135c AB |
789 | ubi_err("corrupted dynamic volume"); |
790 | goto fail; | |
791 | } | |
792 | if (vol->used_ebs != vol->reserved_pebs) { | |
793 | ubi_err("bad used_ebs"); | |
794 | goto fail; | |
795 | } | |
796 | if (vol->last_eb_bytes != vol->usable_leb_size) { | |
797 | ubi_err("bad last_eb_bytes"); | |
798 | goto fail; | |
799 | } | |
800 | if (vol->used_bytes != n) { | |
801 | ubi_err("bad used_bytes"); | |
802 | goto fail; | |
803 | } | |
804 | } else { | |
801c135c AB |
805 | if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) { |
806 | ubi_err("bad used_ebs"); | |
807 | goto fail; | |
808 | } | |
809 | if (vol->last_eb_bytes < 0 || | |
810 | vol->last_eb_bytes > vol->usable_leb_size) { | |
811 | ubi_err("bad last_eb_bytes"); | |
812 | goto fail; | |
813 | } | |
814 | if (vol->used_bytes < 0 || vol->used_bytes > n || | |
815 | vol->used_bytes < n - vol->usable_leb_size) { | |
816 | ubi_err("bad used_bytes"); | |
817 | goto fail; | |
818 | } | |
819 | } | |
820 | ||
3261ebd7 CH |
821 | alignment = be32_to_cpu(ubi->vtbl[vol_id].alignment); |
822 | data_pad = be32_to_cpu(ubi->vtbl[vol_id].data_pad); | |
823 | name_len = be16_to_cpu(ubi->vtbl[vol_id].name_len); | |
801c135c AB |
824 | upd_marker = ubi->vtbl[vol_id].upd_marker; |
825 | name = &ubi->vtbl[vol_id].name[0]; | |
826 | if (ubi->vtbl[vol_id].vol_type == UBI_VID_DYNAMIC) | |
827 | vol_type = UBI_DYNAMIC_VOLUME; | |
828 | else | |
829 | vol_type = UBI_STATIC_VOLUME; | |
830 | ||
831 | if (alignment != vol->alignment || data_pad != vol->data_pad || | |
832 | upd_marker != vol->upd_marker || vol_type != vol->vol_type || | |
9c9ec147 | 833 | name_len != vol->name_len || strncmp(name, vol->name, name_len)) { |
801c135c AB |
834 | ubi_err("volume info is different"); |
835 | goto fail; | |
836 | } | |
837 | ||
b89044bf | 838 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 839 | return 0; |
801c135c AB |
840 | |
841 | fail: | |
7bf523ae | 842 | ubi_err("self-check failed for volume %d", vol_id); |
f40ac9cd | 843 | if (vol) |
766381f0 | 844 | ubi_dump_vol_info(vol); |
1f021e1d | 845 | ubi_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id); |
cfcf0ec8 | 846 | dump_stack(); |
b89044bf | 847 | spin_unlock(&ubi->volumes_lock); |
c8566350 | 848 | return -EINVAL; |
801c135c AB |
849 | } |
850 | ||
851 | /** | |
7bf523ae | 852 | * self_check_volumes - check information about all volumes. |
801c135c | 853 | * @ubi: UBI device description object |
c8566350 AB |
854 | * |
855 | * Returns zero if volumes are all right and a a negative error code if not. | |
801c135c | 856 | */ |
7bf523ae | 857 | static int self_check_volumes(struct ubi_device *ubi) |
801c135c | 858 | { |
c8566350 | 859 | int i, err = 0; |
801c135c | 860 | |
64575574 | 861 | if (!ubi_dbg_chk_gen(ubi)) |
92d124f5 AB |
862 | return 0; |
863 | ||
c8566350 | 864 | for (i = 0; i < ubi->vtbl_slots; i++) { |
7bf523ae | 865 | err = self_check_volume(ubi, i); |
c8566350 AB |
866 | if (err) |
867 | break; | |
868 | } | |
869 | ||
870 | return err; | |
801c135c | 871 | } |