Commit | Line | Data |
---|---|---|
9d54c8a3 EG |
1 | /* |
2 | * Copyright (c) 2014 Ezequiel Garcia | |
3 | * Copyright (c) 2011 Free Electrons | |
4 | * | |
5 | * Driver parameter handling strongly based on drivers/mtd/ubi/build.c | |
6 | * Copyright (c) International Business Machines Corp., 2006 | |
7 | * Copyright (c) Nokia Corporation, 2007 | |
8 | * Authors: Artem Bityutskiy, Frank Haverkamp | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation, version 2. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
17 | * the GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Read-only block devices on top of UBI volumes | |
22 | * | |
23 | * A simple implementation to allow a block device to be layered on top of a | |
24 | * UBI volume. The implementation is provided by creating a static 1-to-1 | |
25 | * mapping between the block device and the UBI volume. | |
26 | * | |
27 | * The addressed byte is obtained from the addressed block sector, which is | |
28 | * mapped linearly into the corresponding LEB: | |
29 | * | |
30 | * LEB number = addressed byte / LEB size | |
31 | * | |
4d283ee2 AB |
32 | * This feature is compiled in the UBI core, and adds a 'block' parameter |
33 | * to allow early creation of block devices on top of UBI volumes. Runtime | |
34 | * block creation/removal for UBI volumes is provided through two UBI ioctls: | |
8af87188 | 35 | * UBI_IOCVOLCRBLK and UBI_IOCVOLRMBLK. |
9d54c8a3 EG |
36 | */ |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/err.h> | |
41 | #include <linux/kernel.h> | |
42 | #include <linux/list.h> | |
43 | #include <linux/mutex.h> | |
44 | #include <linux/slab.h> | |
45 | #include <linux/vmalloc.h> | |
46 | #include <linux/mtd/ubi.h> | |
47 | #include <linux/workqueue.h> | |
48 | #include <linux/blkdev.h> | |
49 | #include <linux/hdreg.h> | |
50 | #include <asm/div64.h> | |
51 | ||
52 | #include "ubi-media.h" | |
53 | #include "ubi.h" | |
54 | ||
55 | /* Maximum number of supported devices */ | |
56 | #define UBIBLOCK_MAX_DEVICES 32 | |
57 | ||
58 | /* Maximum length of the 'block=' parameter */ | |
59 | #define UBIBLOCK_PARAM_LEN 63 | |
60 | ||
61 | /* Maximum number of comma-separated items in the 'block=' parameter */ | |
62 | #define UBIBLOCK_PARAM_COUNT 2 | |
63 | ||
64 | struct ubiblock_param { | |
65 | int ubi_num; | |
66 | int vol_id; | |
67 | char name[UBIBLOCK_PARAM_LEN+1]; | |
68 | }; | |
69 | ||
70 | /* Numbers of elements set in the @ubiblock_param array */ | |
71 | static int ubiblock_devs __initdata; | |
72 | ||
73 | /* MTD devices specification parameters */ | |
74 | static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES] __initdata; | |
75 | ||
76 | struct ubiblock { | |
77 | struct ubi_volume_desc *desc; | |
78 | int ubi_num; | |
79 | int vol_id; | |
80 | int refcnt; | |
81 | int leb_size; | |
82 | ||
83 | struct gendisk *gd; | |
84 | struct request_queue *rq; | |
85 | ||
86 | struct workqueue_struct *wq; | |
87 | struct work_struct work; | |
88 | ||
89 | struct mutex dev_mutex; | |
90 | spinlock_t queue_lock; | |
91 | struct list_head list; | |
92 | }; | |
93 | ||
94 | /* Linked list of all ubiblock instances */ | |
95 | static LIST_HEAD(ubiblock_devices); | |
96 | static DEFINE_MUTEX(devices_mutex); | |
97 | static int ubiblock_major; | |
98 | ||
99 | static int __init ubiblock_set_param(const char *val, | |
100 | const struct kernel_param *kp) | |
101 | { | |
102 | int i, ret; | |
103 | size_t len; | |
104 | struct ubiblock_param *param; | |
105 | char buf[UBIBLOCK_PARAM_LEN]; | |
106 | char *pbuf = &buf[0]; | |
107 | char *tokens[UBIBLOCK_PARAM_COUNT]; | |
108 | ||
109 | if (!val) | |
110 | return -EINVAL; | |
111 | ||
112 | len = strnlen(val, UBIBLOCK_PARAM_LEN); | |
113 | if (len == 0) { | |
114 | ubi_warn("block: empty 'block=' parameter - ignored\n"); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | if (len == UBIBLOCK_PARAM_LEN) { | |
119 | ubi_err("block: parameter \"%s\" is too long, max. is %d\n", | |
120 | val, UBIBLOCK_PARAM_LEN); | |
121 | return -EINVAL; | |
122 | } | |
123 | ||
124 | strcpy(buf, val); | |
125 | ||
126 | /* Get rid of the final newline */ | |
127 | if (buf[len - 1] == '\n') | |
128 | buf[len - 1] = '\0'; | |
129 | ||
130 | for (i = 0; i < UBIBLOCK_PARAM_COUNT; i++) | |
131 | tokens[i] = strsep(&pbuf, ","); | |
132 | ||
133 | param = &ubiblock_param[ubiblock_devs]; | |
134 | if (tokens[1]) { | |
135 | /* Two parameters: can be 'ubi, vol_id' or 'ubi, vol_name' */ | |
136 | ret = kstrtoint(tokens[0], 10, ¶m->ubi_num); | |
137 | if (ret < 0) | |
138 | return -EINVAL; | |
139 | ||
140 | /* Second param can be a number or a name */ | |
141 | ret = kstrtoint(tokens[1], 10, ¶m->vol_id); | |
142 | if (ret < 0) { | |
143 | param->vol_id = -1; | |
144 | strcpy(param->name, tokens[1]); | |
145 | } | |
146 | ||
147 | } else { | |
148 | /* One parameter: must be device path */ | |
149 | strcpy(param->name, tokens[0]); | |
150 | param->ubi_num = -1; | |
151 | param->vol_id = -1; | |
152 | } | |
153 | ||
154 | ubiblock_devs++; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
d56030ac | 159 | static struct kernel_param_ops ubiblock_param_ops = { |
9d54c8a3 EG |
160 | .set = ubiblock_set_param, |
161 | }; | |
162 | module_param_cb(block, &ubiblock_param_ops, NULL, 0); | |
163 | MODULE_PARM_DESC(block, "Attach block devices to UBI volumes. Parameter format: block=<path|dev,num|dev,name>.\n" | |
164 | "Multiple \"block\" parameters may be specified.\n" | |
165 | "UBI volumes may be specified by their number, name, or path to the device node.\n" | |
166 | "Examples\n" | |
167 | "Using the UBI volume path:\n" | |
168 | "ubi.block=/dev/ubi0_0\n" | |
169 | "Using the UBI device, and the volume name:\n" | |
170 | "ubi.block=0,rootfs\n" | |
171 | "Using both UBI device number and UBI volume number:\n" | |
172 | "ubi.block=0,0\n"); | |
173 | ||
174 | static struct ubiblock *find_dev_nolock(int ubi_num, int vol_id) | |
175 | { | |
176 | struct ubiblock *dev; | |
177 | ||
178 | list_for_each_entry(dev, &ubiblock_devices, list) | |
179 | if (dev->ubi_num == ubi_num && dev->vol_id == vol_id) | |
180 | return dev; | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | static int ubiblock_read_to_buf(struct ubiblock *dev, char *buffer, | |
185 | int leb, int offset, int len) | |
186 | { | |
187 | int ret; | |
188 | ||
189 | ret = ubi_read(dev->desc, leb, buffer, offset, len); | |
190 | if (ret) { | |
978d6496 EG |
191 | ubi_err("%s: error %d while reading from LEB %d (offset %d, " |
192 | "length %d)", dev->gd->disk_name, ret, leb, offset, | |
193 | len); | |
9d54c8a3 EG |
194 | return ret; |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int ubiblock_read(struct ubiblock *dev, char *buffer, | |
200 | sector_t sec, int len) | |
201 | { | |
202 | int ret, leb, offset; | |
203 | int bytes_left = len; | |
204 | int to_read = len; | |
9981e14a | 205 | u64 pos = sec << 9; |
9d54c8a3 EG |
206 | |
207 | /* Get LEB:offset address to read from */ | |
208 | offset = do_div(pos, dev->leb_size); | |
209 | leb = pos; | |
210 | ||
211 | while (bytes_left) { | |
212 | /* | |
213 | * We can only read one LEB at a time. Therefore if the read | |
214 | * length is larger than one LEB size, we split the operation. | |
215 | */ | |
216 | if (offset + to_read > dev->leb_size) | |
217 | to_read = dev->leb_size - offset; | |
218 | ||
219 | ret = ubiblock_read_to_buf(dev, buffer, leb, offset, to_read); | |
220 | if (ret) | |
221 | return ret; | |
222 | ||
223 | buffer += to_read; | |
224 | bytes_left -= to_read; | |
225 | to_read = bytes_left; | |
226 | leb += 1; | |
227 | offset = 0; | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static int do_ubiblock_request(struct ubiblock *dev, struct request *req) | |
233 | { | |
234 | int len, ret; | |
235 | sector_t sec; | |
236 | ||
237 | if (req->cmd_type != REQ_TYPE_FS) | |
238 | return -EIO; | |
239 | ||
240 | if (blk_rq_pos(req) + blk_rq_cur_sectors(req) > | |
241 | get_capacity(req->rq_disk)) | |
242 | return -EIO; | |
243 | ||
244 | if (rq_data_dir(req) != READ) | |
245 | return -ENOSYS; /* Write not implemented */ | |
246 | ||
247 | sec = blk_rq_pos(req); | |
248 | len = blk_rq_cur_bytes(req); | |
249 | ||
250 | /* | |
251 | * Let's prevent the device from being removed while we're doing I/O | |
252 | * work. Notice that this means we serialize all the I/O operations, | |
253 | * but it's probably of no impact given the NAND core serializes | |
254 | * flash access anyway. | |
255 | */ | |
256 | mutex_lock(&dev->dev_mutex); | |
b4f42e28 | 257 | ret = ubiblock_read(dev, bio_data(req->bio), sec, len); |
9d54c8a3 EG |
258 | mutex_unlock(&dev->dev_mutex); |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | static void ubiblock_do_work(struct work_struct *work) | |
264 | { | |
265 | struct ubiblock *dev = | |
266 | container_of(work, struct ubiblock, work); | |
267 | struct request_queue *rq = dev->rq; | |
268 | struct request *req; | |
269 | int res; | |
270 | ||
271 | spin_lock_irq(rq->queue_lock); | |
272 | ||
273 | req = blk_fetch_request(rq); | |
274 | while (req) { | |
275 | ||
276 | spin_unlock_irq(rq->queue_lock); | |
277 | res = do_ubiblock_request(dev, req); | |
278 | spin_lock_irq(rq->queue_lock); | |
279 | ||
280 | /* | |
281 | * If we're done with this request, | |
282 | * we need to fetch a new one | |
283 | */ | |
284 | if (!__blk_end_request_cur(req, res)) | |
285 | req = blk_fetch_request(rq); | |
286 | } | |
287 | ||
288 | spin_unlock_irq(rq->queue_lock); | |
289 | } | |
290 | ||
291 | static void ubiblock_request(struct request_queue *rq) | |
292 | { | |
293 | struct ubiblock *dev; | |
294 | struct request *req; | |
295 | ||
296 | dev = rq->queuedata; | |
297 | ||
298 | if (!dev) | |
299 | while ((req = blk_fetch_request(rq)) != NULL) | |
300 | __blk_end_request_all(req, -ENODEV); | |
301 | else | |
302 | queue_work(dev->wq, &dev->work); | |
303 | } | |
304 | ||
305 | static int ubiblock_open(struct block_device *bdev, fmode_t mode) | |
306 | { | |
307 | struct ubiblock *dev = bdev->bd_disk->private_data; | |
308 | int ret; | |
309 | ||
310 | mutex_lock(&dev->dev_mutex); | |
311 | if (dev->refcnt > 0) { | |
312 | /* | |
313 | * The volume is already open, just increase the reference | |
314 | * counter. | |
315 | */ | |
316 | goto out_done; | |
317 | } | |
318 | ||
319 | /* | |
320 | * We want users to be aware they should only mount us as read-only. | |
321 | * It's just a paranoid check, as write requests will get rejected | |
322 | * in any case. | |
323 | */ | |
324 | if (mode & FMODE_WRITE) { | |
325 | ret = -EPERM; | |
326 | goto out_unlock; | |
327 | } | |
328 | ||
329 | dev->desc = ubi_open_volume(dev->ubi_num, dev->vol_id, UBI_READONLY); | |
330 | if (IS_ERR(dev->desc)) { | |
331 | ubi_err("%s failed to open ubi volume %d_%d", | |
332 | dev->gd->disk_name, dev->ubi_num, dev->vol_id); | |
333 | ret = PTR_ERR(dev->desc); | |
334 | dev->desc = NULL; | |
335 | goto out_unlock; | |
336 | } | |
337 | ||
338 | out_done: | |
339 | dev->refcnt++; | |
340 | mutex_unlock(&dev->dev_mutex); | |
341 | return 0; | |
342 | ||
343 | out_unlock: | |
344 | mutex_unlock(&dev->dev_mutex); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | static void ubiblock_release(struct gendisk *gd, fmode_t mode) | |
349 | { | |
350 | struct ubiblock *dev = gd->private_data; | |
351 | ||
352 | mutex_lock(&dev->dev_mutex); | |
353 | dev->refcnt--; | |
354 | if (dev->refcnt == 0) { | |
355 | ubi_close_volume(dev->desc); | |
356 | dev->desc = NULL; | |
357 | } | |
358 | mutex_unlock(&dev->dev_mutex); | |
359 | } | |
360 | ||
361 | static int ubiblock_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
362 | { | |
363 | /* Some tools might require this information */ | |
364 | geo->heads = 1; | |
365 | geo->cylinders = 1; | |
366 | geo->sectors = get_capacity(bdev->bd_disk); | |
367 | geo->start = 0; | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static const struct block_device_operations ubiblock_ops = { | |
372 | .owner = THIS_MODULE, | |
373 | .open = ubiblock_open, | |
374 | .release = ubiblock_release, | |
375 | .getgeo = ubiblock_getgeo, | |
376 | }; | |
377 | ||
4d283ee2 | 378 | int ubiblock_create(struct ubi_volume_info *vi) |
9d54c8a3 EG |
379 | { |
380 | struct ubiblock *dev; | |
381 | struct gendisk *gd; | |
978d6496 | 382 | u64 disk_capacity = vi->used_bytes >> 9; |
9d54c8a3 EG |
383 | int ret; |
384 | ||
4df38926 RW |
385 | if ((sector_t)disk_capacity != disk_capacity) |
386 | return -EFBIG; | |
9d54c8a3 EG |
387 | /* Check that the volume isn't already handled */ |
388 | mutex_lock(&devices_mutex); | |
389 | if (find_dev_nolock(vi->ubi_num, vi->vol_id)) { | |
390 | mutex_unlock(&devices_mutex); | |
391 | return -EEXIST; | |
392 | } | |
393 | mutex_unlock(&devices_mutex); | |
394 | ||
395 | dev = kzalloc(sizeof(struct ubiblock), GFP_KERNEL); | |
396 | if (!dev) | |
397 | return -ENOMEM; | |
398 | ||
399 | mutex_init(&dev->dev_mutex); | |
400 | ||
401 | dev->ubi_num = vi->ubi_num; | |
402 | dev->vol_id = vi->vol_id; | |
403 | dev->leb_size = vi->usable_leb_size; | |
404 | ||
405 | /* Initialize the gendisk of this ubiblock device */ | |
406 | gd = alloc_disk(1); | |
407 | if (!gd) { | |
408 | ubi_err("block: alloc_disk failed"); | |
409 | ret = -ENODEV; | |
410 | goto out_free_dev; | |
411 | } | |
412 | ||
413 | gd->fops = &ubiblock_ops; | |
414 | gd->major = ubiblock_major; | |
415 | gd->first_minor = dev->ubi_num * UBI_MAX_VOLUMES + dev->vol_id; | |
416 | gd->private_data = dev; | |
417 | sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id); | |
9d54c8a3 EG |
418 | set_capacity(gd, disk_capacity); |
419 | dev->gd = gd; | |
420 | ||
421 | spin_lock_init(&dev->queue_lock); | |
422 | dev->rq = blk_init_queue(ubiblock_request, &dev->queue_lock); | |
423 | if (!dev->rq) { | |
424 | ubi_err("block: blk_init_queue failed"); | |
425 | ret = -ENODEV; | |
426 | goto out_put_disk; | |
427 | } | |
428 | ||
429 | dev->rq->queuedata = dev; | |
430 | dev->gd->queue = dev->rq; | |
431 | ||
432 | /* | |
433 | * Create one workqueue per volume (per registered block device). | |
434 | * Rembember workqueues are cheap, they're not threads. | |
435 | */ | |
bebfef15 | 436 | dev->wq = alloc_workqueue("%s", 0, 0, gd->disk_name); |
151d6b21 HS |
437 | if (!dev->wq) { |
438 | ret = -ENOMEM; | |
9d54c8a3 | 439 | goto out_free_queue; |
151d6b21 | 440 | } |
9d54c8a3 EG |
441 | INIT_WORK(&dev->work, ubiblock_do_work); |
442 | ||
443 | mutex_lock(&devices_mutex); | |
444 | list_add_tail(&dev->list, &ubiblock_devices); | |
445 | mutex_unlock(&devices_mutex); | |
446 | ||
447 | /* Must be the last step: anyone can call file ops from now on */ | |
448 | add_disk(dev->gd); | |
449 | ubi_msg("%s created from ubi%d:%d(%s)", | |
450 | dev->gd->disk_name, dev->ubi_num, dev->vol_id, vi->name); | |
451 | return 0; | |
452 | ||
453 | out_free_queue: | |
454 | blk_cleanup_queue(dev->rq); | |
455 | out_put_disk: | |
456 | put_disk(dev->gd); | |
457 | out_free_dev: | |
458 | kfree(dev); | |
459 | ||
460 | return ret; | |
461 | } | |
462 | ||
463 | static void ubiblock_cleanup(struct ubiblock *dev) | |
464 | { | |
465 | del_gendisk(dev->gd); | |
466 | blk_cleanup_queue(dev->rq); | |
467 | ubi_msg("%s released", dev->gd->disk_name); | |
468 | put_disk(dev->gd); | |
469 | } | |
470 | ||
4d283ee2 | 471 | int ubiblock_remove(struct ubi_volume_info *vi) |
9d54c8a3 EG |
472 | { |
473 | struct ubiblock *dev; | |
474 | ||
475 | mutex_lock(&devices_mutex); | |
476 | dev = find_dev_nolock(vi->ubi_num, vi->vol_id); | |
477 | if (!dev) { | |
478 | mutex_unlock(&devices_mutex); | |
479 | return -ENODEV; | |
480 | } | |
481 | ||
482 | /* Found a device, let's lock it so we can check if it's busy */ | |
483 | mutex_lock(&dev->dev_mutex); | |
484 | if (dev->refcnt > 0) { | |
485 | mutex_unlock(&dev->dev_mutex); | |
486 | mutex_unlock(&devices_mutex); | |
487 | return -EBUSY; | |
488 | } | |
489 | ||
490 | /* Remove from device list */ | |
491 | list_del(&dev->list); | |
492 | mutex_unlock(&devices_mutex); | |
493 | ||
494 | /* Flush pending work and stop this workqueue */ | |
495 | destroy_workqueue(dev->wq); | |
496 | ||
497 | ubiblock_cleanup(dev); | |
498 | mutex_unlock(&dev->dev_mutex); | |
499 | kfree(dev); | |
500 | return 0; | |
501 | } | |
502 | ||
495f2bf6 | 503 | static int ubiblock_resize(struct ubi_volume_info *vi) |
9d54c8a3 EG |
504 | { |
505 | struct ubiblock *dev; | |
978d6496 | 506 | u64 disk_capacity = vi->used_bytes >> 9; |
9d54c8a3 EG |
507 | |
508 | /* | |
509 | * Need to lock the device list until we stop using the device, | |
4d283ee2 AB |
510 | * otherwise the device struct might get released in |
511 | * 'ubiblock_remove()'. | |
9d54c8a3 EG |
512 | */ |
513 | mutex_lock(&devices_mutex); | |
514 | dev = find_dev_nolock(vi->ubi_num, vi->vol_id); | |
515 | if (!dev) { | |
516 | mutex_unlock(&devices_mutex); | |
495f2bf6 | 517 | return -ENODEV; |
9d54c8a3 | 518 | } |
3df77072 CIK |
519 | if ((sector_t)disk_capacity != disk_capacity) { |
520 | mutex_unlock(&devices_mutex); | |
521 | ubi_warn("%s: the volume is too big (%d LEBs), cannot resize", | |
522 | dev->gd->disk_name, vi->size); | |
523 | return -EFBIG; | |
524 | } | |
9d54c8a3 EG |
525 | |
526 | mutex_lock(&dev->dev_mutex); | |
06d9c290 EG |
527 | |
528 | if (get_capacity(dev->gd) != disk_capacity) { | |
529 | set_capacity(dev->gd, disk_capacity); | |
530 | ubi_msg("%s resized to %lld bytes", dev->gd->disk_name, | |
531 | vi->used_bytes); | |
532 | } | |
9d54c8a3 EG |
533 | mutex_unlock(&dev->dev_mutex); |
534 | mutex_unlock(&devices_mutex); | |
495f2bf6 | 535 | return 0; |
9d54c8a3 EG |
536 | } |
537 | ||
538 | static int ubiblock_notify(struct notifier_block *nb, | |
539 | unsigned long notification_type, void *ns_ptr) | |
540 | { | |
541 | struct ubi_notification *nt = ns_ptr; | |
542 | ||
543 | switch (notification_type) { | |
544 | case UBI_VOLUME_ADDED: | |
545 | /* | |
4d283ee2 | 546 | * We want to enforce explicit block device creation for |
9d54c8a3 EG |
547 | * volumes, so when a volume is added we do nothing. |
548 | */ | |
549 | break; | |
550 | case UBI_VOLUME_REMOVED: | |
4d283ee2 | 551 | ubiblock_remove(&nt->vi); |
9d54c8a3 EG |
552 | break; |
553 | case UBI_VOLUME_RESIZED: | |
554 | ubiblock_resize(&nt->vi); | |
555 | break; | |
06d9c290 EG |
556 | case UBI_VOLUME_UPDATED: |
557 | /* | |
558 | * If the volume is static, a content update might mean the | |
559 | * size (i.e. used_bytes) was also changed. | |
560 | */ | |
561 | if (nt->vi.vol_type == UBI_STATIC_VOLUME) | |
562 | ubiblock_resize(&nt->vi); | |
563 | break; | |
9d54c8a3 EG |
564 | default: |
565 | break; | |
566 | } | |
567 | return NOTIFY_OK; | |
568 | } | |
569 | ||
570 | static struct notifier_block ubiblock_notifier = { | |
571 | .notifier_call = ubiblock_notify, | |
572 | }; | |
573 | ||
574 | static struct ubi_volume_desc * __init | |
575 | open_volume_desc(const char *name, int ubi_num, int vol_id) | |
576 | { | |
577 | if (ubi_num == -1) | |
578 | /* No ubi num, name must be a vol device path */ | |
579 | return ubi_open_volume_path(name, UBI_READONLY); | |
580 | else if (vol_id == -1) | |
581 | /* No vol_id, must be vol_name */ | |
582 | return ubi_open_volume_nm(ubi_num, name, UBI_READONLY); | |
583 | else | |
584 | return ubi_open_volume(ubi_num, vol_id, UBI_READONLY); | |
585 | } | |
586 | ||
4d283ee2 | 587 | static int __init ubiblock_create_from_param(void) |
9d54c8a3 EG |
588 | { |
589 | int i, ret; | |
590 | struct ubiblock_param *p; | |
591 | struct ubi_volume_desc *desc; | |
592 | struct ubi_volume_info vi; | |
593 | ||
594 | for (i = 0; i < ubiblock_devs; i++) { | |
595 | p = &ubiblock_param[i]; | |
596 | ||
597 | desc = open_volume_desc(p->name, p->ubi_num, p->vol_id); | |
598 | if (IS_ERR(desc)) { | |
599 | ubi_err("block: can't open volume, err=%ld\n", | |
600 | PTR_ERR(desc)); | |
601 | ret = PTR_ERR(desc); | |
602 | break; | |
603 | } | |
604 | ||
605 | ubi_get_volume_info(desc, &vi); | |
606 | ubi_close_volume(desc); | |
607 | ||
4d283ee2 | 608 | ret = ubiblock_create(&vi); |
9d54c8a3 EG |
609 | if (ret) { |
610 | ubi_err("block: can't add '%s' volume, err=%d\n", | |
611 | vi.name, ret); | |
612 | break; | |
613 | } | |
614 | } | |
615 | return ret; | |
616 | } | |
617 | ||
4d283ee2 | 618 | static void ubiblock_remove_all(void) |
9d54c8a3 EG |
619 | { |
620 | struct ubiblock *next; | |
621 | struct ubiblock *dev; | |
622 | ||
623 | list_for_each_entry_safe(dev, next, &ubiblock_devices, list) { | |
624 | /* Flush pending work and stop workqueue */ | |
625 | destroy_workqueue(dev->wq); | |
626 | /* The module is being forcefully removed */ | |
627 | WARN_ON(dev->desc); | |
628 | /* Remove from device list */ | |
629 | list_del(&dev->list); | |
630 | ubiblock_cleanup(dev); | |
631 | kfree(dev); | |
632 | } | |
633 | } | |
634 | ||
635 | int __init ubiblock_init(void) | |
636 | { | |
637 | int ret; | |
638 | ||
639 | ubiblock_major = register_blkdev(0, "ubiblock"); | |
640 | if (ubiblock_major < 0) | |
641 | return ubiblock_major; | |
642 | ||
643 | /* Attach block devices from 'block=' module param */ | |
4d283ee2 | 644 | ret = ubiblock_create_from_param(); |
9d54c8a3 | 645 | if (ret) |
4d283ee2 | 646 | goto err_remove; |
9d54c8a3 EG |
647 | |
648 | /* | |
4d283ee2 AB |
649 | * Block devices are only created upon user requests, so we ignore |
650 | * existing volumes. | |
9d54c8a3 EG |
651 | */ |
652 | ret = ubi_register_volume_notifier(&ubiblock_notifier, 1); | |
653 | if (ret) | |
654 | goto err_unreg; | |
655 | return 0; | |
656 | ||
657 | err_unreg: | |
658 | unregister_blkdev(ubiblock_major, "ubiblock"); | |
4d283ee2 AB |
659 | err_remove: |
660 | ubiblock_remove_all(); | |
9d54c8a3 EG |
661 | return ret; |
662 | } | |
663 | ||
664 | void __exit ubiblock_exit(void) | |
665 | { | |
666 | ubi_unregister_volume_notifier(&ubiblock_notifier); | |
4d283ee2 | 667 | ubiblock_remove_all(); |
9d54c8a3 EG |
668 | unregister_blkdev(ubiblock_major, "ubiblock"); |
669 | } |