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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> | |
9d54c8a3 EG |
45 | #include <linux/mtd/ubi.h> |
46 | #include <linux/workqueue.h> | |
47 | #include <linux/blkdev.h> | |
ff1f48ee | 48 | #include <linux/blk-mq.h> |
9d54c8a3 | 49 | #include <linux/hdreg.h> |
ff1f48ee | 50 | #include <linux/scatterlist.h> |
2bf50d42 | 51 | #include <linux/idr.h> |
9d54c8a3 EG |
52 | #include <asm/div64.h> |
53 | ||
54 | #include "ubi-media.h" | |
55 | #include "ubi.h" | |
56 | ||
57 | /* Maximum number of supported devices */ | |
58 | #define UBIBLOCK_MAX_DEVICES 32 | |
59 | ||
60 | /* Maximum length of the 'block=' parameter */ | |
61 | #define UBIBLOCK_PARAM_LEN 63 | |
62 | ||
63 | /* Maximum number of comma-separated items in the 'block=' parameter */ | |
64 | #define UBIBLOCK_PARAM_COUNT 2 | |
65 | ||
66 | struct ubiblock_param { | |
67 | int ubi_num; | |
68 | int vol_id; | |
69 | char name[UBIBLOCK_PARAM_LEN+1]; | |
70 | }; | |
71 | ||
ff1f48ee RW |
72 | struct ubiblock_pdu { |
73 | struct work_struct work; | |
74 | struct ubi_sgl usgl; | |
75 | }; | |
76 | ||
9d54c8a3 EG |
77 | /* Numbers of elements set in the @ubiblock_param array */ |
78 | static int ubiblock_devs __initdata; | |
79 | ||
80 | /* MTD devices specification parameters */ | |
81 | static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES] __initdata; | |
82 | ||
83 | struct ubiblock { | |
84 | struct ubi_volume_desc *desc; | |
85 | int ubi_num; | |
86 | int vol_id; | |
87 | int refcnt; | |
88 | int leb_size; | |
89 | ||
90 | struct gendisk *gd; | |
91 | struct request_queue *rq; | |
92 | ||
93 | struct workqueue_struct *wq; | |
9d54c8a3 EG |
94 | |
95 | struct mutex dev_mutex; | |
9d54c8a3 | 96 | struct list_head list; |
ff1f48ee | 97 | struct blk_mq_tag_set tag_set; |
9d54c8a3 EG |
98 | }; |
99 | ||
100 | /* Linked list of all ubiblock instances */ | |
101 | static LIST_HEAD(ubiblock_devices); | |
102 | static DEFINE_MUTEX(devices_mutex); | |
103 | static int ubiblock_major; | |
104 | ||
105 | static int __init ubiblock_set_param(const char *val, | |
106 | const struct kernel_param *kp) | |
107 | { | |
108 | int i, ret; | |
109 | size_t len; | |
110 | struct ubiblock_param *param; | |
111 | char buf[UBIBLOCK_PARAM_LEN]; | |
112 | char *pbuf = &buf[0]; | |
113 | char *tokens[UBIBLOCK_PARAM_COUNT]; | |
114 | ||
115 | if (!val) | |
116 | return -EINVAL; | |
117 | ||
118 | len = strnlen(val, UBIBLOCK_PARAM_LEN); | |
119 | if (len == 0) { | |
32608703 | 120 | pr_warn("UBI: block: empty 'block=' parameter - ignored\n"); |
9d54c8a3 EG |
121 | return 0; |
122 | } | |
123 | ||
124 | if (len == UBIBLOCK_PARAM_LEN) { | |
32608703 TB |
125 | pr_err("UBI: block: parameter \"%s\" is too long, max. is %d\n", |
126 | val, UBIBLOCK_PARAM_LEN); | |
9d54c8a3 EG |
127 | return -EINVAL; |
128 | } | |
129 | ||
130 | strcpy(buf, val); | |
131 | ||
132 | /* Get rid of the final newline */ | |
133 | if (buf[len - 1] == '\n') | |
134 | buf[len - 1] = '\0'; | |
135 | ||
136 | for (i = 0; i < UBIBLOCK_PARAM_COUNT; i++) | |
137 | tokens[i] = strsep(&pbuf, ","); | |
138 | ||
139 | param = &ubiblock_param[ubiblock_devs]; | |
140 | if (tokens[1]) { | |
141 | /* Two parameters: can be 'ubi, vol_id' or 'ubi, vol_name' */ | |
142 | ret = kstrtoint(tokens[0], 10, ¶m->ubi_num); | |
143 | if (ret < 0) | |
144 | return -EINVAL; | |
145 | ||
146 | /* Second param can be a number or a name */ | |
147 | ret = kstrtoint(tokens[1], 10, ¶m->vol_id); | |
148 | if (ret < 0) { | |
149 | param->vol_id = -1; | |
150 | strcpy(param->name, tokens[1]); | |
151 | } | |
152 | ||
153 | } else { | |
154 | /* One parameter: must be device path */ | |
155 | strcpy(param->name, tokens[0]); | |
156 | param->ubi_num = -1; | |
157 | param->vol_id = -1; | |
158 | } | |
159 | ||
160 | ubiblock_devs++; | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
9c27847d | 165 | static const struct kernel_param_ops ubiblock_param_ops = { |
9d54c8a3 EG |
166 | .set = ubiblock_set_param, |
167 | }; | |
168 | module_param_cb(block, &ubiblock_param_ops, NULL, 0); | |
169 | MODULE_PARM_DESC(block, "Attach block devices to UBI volumes. Parameter format: block=<path|dev,num|dev,name>.\n" | |
170 | "Multiple \"block\" parameters may be specified.\n" | |
171 | "UBI volumes may be specified by their number, name, or path to the device node.\n" | |
172 | "Examples\n" | |
173 | "Using the UBI volume path:\n" | |
174 | "ubi.block=/dev/ubi0_0\n" | |
175 | "Using the UBI device, and the volume name:\n" | |
176 | "ubi.block=0,rootfs\n" | |
177 | "Using both UBI device number and UBI volume number:\n" | |
178 | "ubi.block=0,0\n"); | |
179 | ||
180 | static struct ubiblock *find_dev_nolock(int ubi_num, int vol_id) | |
181 | { | |
182 | struct ubiblock *dev; | |
183 | ||
184 | list_for_each_entry(dev, &ubiblock_devices, list) | |
185 | if (dev->ubi_num == ubi_num && dev->vol_id == vol_id) | |
186 | return dev; | |
187 | return NULL; | |
188 | } | |
189 | ||
ff1f48ee | 190 | static int ubiblock_read(struct ubiblock_pdu *pdu) |
9d54c8a3 | 191 | { |
ff1f48ee RW |
192 | int ret, leb, offset, bytes_left, to_read; |
193 | u64 pos; | |
194 | struct request *req = blk_mq_rq_from_pdu(pdu); | |
195 | struct ubiblock *dev = req->q->queuedata; | |
9d54c8a3 | 196 | |
ff1f48ee RW |
197 | to_read = blk_rq_bytes(req); |
198 | pos = blk_rq_pos(req) << 9; | |
9d54c8a3 EG |
199 | |
200 | /* Get LEB:offset address to read from */ | |
201 | offset = do_div(pos, dev->leb_size); | |
202 | leb = pos; | |
ff1f48ee | 203 | bytes_left = to_read; |
9d54c8a3 EG |
204 | |
205 | while (bytes_left) { | |
206 | /* | |
207 | * We can only read one LEB at a time. Therefore if the read | |
208 | * length is larger than one LEB size, we split the operation. | |
209 | */ | |
210 | if (offset + to_read > dev->leb_size) | |
211 | to_read = dev->leb_size - offset; | |
212 | ||
ff1f48ee RW |
213 | ret = ubi_read_sg(dev->desc, leb, &pdu->usgl, offset, to_read); |
214 | if (ret < 0) | |
9d54c8a3 EG |
215 | return ret; |
216 | ||
9d54c8a3 EG |
217 | bytes_left -= to_read; |
218 | to_read = bytes_left; | |
219 | leb += 1; | |
220 | offset = 0; | |
221 | } | |
222 | return 0; | |
223 | } | |
224 | ||
9d54c8a3 EG |
225 | static int ubiblock_open(struct block_device *bdev, fmode_t mode) |
226 | { | |
227 | struct ubiblock *dev = bdev->bd_disk->private_data; | |
228 | int ret; | |
229 | ||
230 | mutex_lock(&dev->dev_mutex); | |
231 | if (dev->refcnt > 0) { | |
232 | /* | |
233 | * The volume is already open, just increase the reference | |
234 | * counter. | |
235 | */ | |
236 | goto out_done; | |
237 | } | |
238 | ||
239 | /* | |
240 | * We want users to be aware they should only mount us as read-only. | |
241 | * It's just a paranoid check, as write requests will get rejected | |
242 | * in any case. | |
243 | */ | |
244 | if (mode & FMODE_WRITE) { | |
245 | ret = -EPERM; | |
246 | goto out_unlock; | |
247 | } | |
248 | ||
249 | dev->desc = ubi_open_volume(dev->ubi_num, dev->vol_id, UBI_READONLY); | |
250 | if (IS_ERR(dev->desc)) { | |
32608703 TB |
251 | dev_err(disk_to_dev(dev->gd), "failed to open ubi volume %d_%d", |
252 | dev->ubi_num, dev->vol_id); | |
9d54c8a3 EG |
253 | ret = PTR_ERR(dev->desc); |
254 | dev->desc = NULL; | |
255 | goto out_unlock; | |
256 | } | |
257 | ||
258 | out_done: | |
259 | dev->refcnt++; | |
260 | mutex_unlock(&dev->dev_mutex); | |
261 | return 0; | |
262 | ||
263 | out_unlock: | |
264 | mutex_unlock(&dev->dev_mutex); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | static void ubiblock_release(struct gendisk *gd, fmode_t mode) | |
269 | { | |
270 | struct ubiblock *dev = gd->private_data; | |
271 | ||
272 | mutex_lock(&dev->dev_mutex); | |
273 | dev->refcnt--; | |
274 | if (dev->refcnt == 0) { | |
275 | ubi_close_volume(dev->desc); | |
276 | dev->desc = NULL; | |
277 | } | |
278 | mutex_unlock(&dev->dev_mutex); | |
279 | } | |
280 | ||
281 | static int ubiblock_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
282 | { | |
283 | /* Some tools might require this information */ | |
284 | geo->heads = 1; | |
285 | geo->cylinders = 1; | |
286 | geo->sectors = get_capacity(bdev->bd_disk); | |
287 | geo->start = 0; | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static const struct block_device_operations ubiblock_ops = { | |
292 | .owner = THIS_MODULE, | |
293 | .open = ubiblock_open, | |
294 | .release = ubiblock_release, | |
295 | .getgeo = ubiblock_getgeo, | |
296 | }; | |
297 | ||
ff1f48ee RW |
298 | static void ubiblock_do_work(struct work_struct *work) |
299 | { | |
300 | int ret; | |
301 | struct ubiblock_pdu *pdu = container_of(work, struct ubiblock_pdu, work); | |
302 | struct request *req = blk_mq_rq_from_pdu(pdu); | |
303 | ||
304 | blk_mq_start_request(req); | |
832b52a1 RW |
305 | |
306 | /* | |
307 | * It is safe to ignore the return value of blk_rq_map_sg() because | |
308 | * the number of sg entries is limited to UBI_MAX_SG_COUNT | |
309 | * and ubi_read_sg() will check that limit. | |
310 | */ | |
ff1f48ee RW |
311 | blk_rq_map_sg(req->q, req, pdu->usgl.sg); |
312 | ||
313 | ret = ubiblock_read(pdu); | |
98fb1ffd KC |
314 | rq_flush_dcache_pages(req); |
315 | ||
ff1f48ee RW |
316 | blk_mq_end_request(req, ret); |
317 | } | |
318 | ||
319 | static int ubiblock_queue_rq(struct blk_mq_hw_ctx *hctx, | |
320 | const struct blk_mq_queue_data *bd) | |
321 | { | |
322 | struct request *req = bd->rq; | |
323 | struct ubiblock *dev = hctx->queue->queuedata; | |
324 | struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req); | |
325 | ||
aebf526b CH |
326 | switch (req_op(req)) { |
327 | case REQ_OP_READ: | |
328 | ubi_sgl_init(&pdu->usgl); | |
329 | queue_work(dev->wq, &pdu->work); | |
330 | return BLK_MQ_RQ_QUEUE_OK; | |
331 | default: | |
ff1f48ee | 332 | return BLK_MQ_RQ_QUEUE_ERROR; |
aebf526b | 333 | } |
ff1f48ee | 334 | |
ff1f48ee RW |
335 | } |
336 | ||
337 | static int ubiblock_init_request(void *data, struct request *req, | |
338 | unsigned int hctx_idx, | |
339 | unsigned int request_idx, | |
340 | unsigned int numa_node) | |
341 | { | |
342 | struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req); | |
343 | ||
344 | sg_init_table(pdu->usgl.sg, UBI_MAX_SG_COUNT); | |
345 | INIT_WORK(&pdu->work, ubiblock_do_work); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
f363b089 | 350 | static const struct blk_mq_ops ubiblock_mq_ops = { |
ff1f48ee RW |
351 | .queue_rq = ubiblock_queue_rq, |
352 | .init_request = ubiblock_init_request, | |
ff1f48ee RW |
353 | }; |
354 | ||
2bf50d42 DE |
355 | static DEFINE_IDR(ubiblock_minor_idr); |
356 | ||
4d283ee2 | 357 | int ubiblock_create(struct ubi_volume_info *vi) |
9d54c8a3 EG |
358 | { |
359 | struct ubiblock *dev; | |
360 | struct gendisk *gd; | |
978d6496 | 361 | u64 disk_capacity = vi->used_bytes >> 9; |
9d54c8a3 EG |
362 | int ret; |
363 | ||
4df38926 RW |
364 | if ((sector_t)disk_capacity != disk_capacity) |
365 | return -EFBIG; | |
9d54c8a3 EG |
366 | /* Check that the volume isn't already handled */ |
367 | mutex_lock(&devices_mutex); | |
368 | if (find_dev_nolock(vi->ubi_num, vi->vol_id)) { | |
369 | mutex_unlock(&devices_mutex); | |
370 | return -EEXIST; | |
371 | } | |
372 | mutex_unlock(&devices_mutex); | |
373 | ||
374 | dev = kzalloc(sizeof(struct ubiblock), GFP_KERNEL); | |
375 | if (!dev) | |
376 | return -ENOMEM; | |
377 | ||
378 | mutex_init(&dev->dev_mutex); | |
379 | ||
380 | dev->ubi_num = vi->ubi_num; | |
381 | dev->vol_id = vi->vol_id; | |
382 | dev->leb_size = vi->usable_leb_size; | |
383 | ||
384 | /* Initialize the gendisk of this ubiblock device */ | |
385 | gd = alloc_disk(1); | |
386 | if (!gd) { | |
32608703 | 387 | pr_err("UBI: block: alloc_disk failed"); |
9d54c8a3 EG |
388 | ret = -ENODEV; |
389 | goto out_free_dev; | |
390 | } | |
391 | ||
392 | gd->fops = &ubiblock_ops; | |
393 | gd->major = ubiblock_major; | |
2bf50d42 DE |
394 | gd->first_minor = idr_alloc(&ubiblock_minor_idr, dev, 0, 0, GFP_KERNEL); |
395 | if (gd->first_minor < 0) { | |
396 | dev_err(disk_to_dev(gd), | |
397 | "block: dynamic minor allocation failed"); | |
398 | ret = -ENODEV; | |
399 | goto out_put_disk; | |
400 | } | |
9d54c8a3 EG |
401 | gd->private_data = dev; |
402 | sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id); | |
9d54c8a3 EG |
403 | set_capacity(gd, disk_capacity); |
404 | dev->gd = gd; | |
405 | ||
ff1f48ee RW |
406 | dev->tag_set.ops = &ubiblock_mq_ops; |
407 | dev->tag_set.queue_depth = 64; | |
408 | dev->tag_set.numa_node = NUMA_NO_NODE; | |
409 | dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
410 | dev->tag_set.cmd_size = sizeof(struct ubiblock_pdu); | |
411 | dev->tag_set.driver_data = dev; | |
412 | dev->tag_set.nr_hw_queues = 1; | |
413 | ||
414 | ret = blk_mq_alloc_tag_set(&dev->tag_set); | |
415 | if (ret) { | |
416 | dev_err(disk_to_dev(dev->gd), "blk_mq_alloc_tag_set failed"); | |
2bf50d42 | 417 | goto out_remove_minor; |
ff1f48ee RW |
418 | } |
419 | ||
420 | dev->rq = blk_mq_init_queue(&dev->tag_set); | |
8168b9bb | 421 | if (IS_ERR(dev->rq)) { |
ff1f48ee | 422 | dev_err(disk_to_dev(gd), "blk_mq_init_queue failed"); |
8168b9bb | 423 | ret = PTR_ERR(dev->rq); |
ff1f48ee | 424 | goto out_free_tags; |
9d54c8a3 | 425 | } |
ff1f48ee | 426 | blk_queue_max_segments(dev->rq, UBI_MAX_SG_COUNT); |
9d54c8a3 EG |
427 | |
428 | dev->rq->queuedata = dev; | |
429 | dev->gd->queue = dev->rq; | |
430 | ||
431 | /* | |
432 | * Create one workqueue per volume (per registered block device). | |
433 | * Rembember workqueues are cheap, they're not threads. | |
434 | */ | |
bebfef15 | 435 | dev->wq = alloc_workqueue("%s", 0, 0, gd->disk_name); |
151d6b21 HS |
436 | if (!dev->wq) { |
437 | ret = -ENOMEM; | |
9d54c8a3 | 438 | goto out_free_queue; |
151d6b21 | 439 | } |
9d54c8a3 EG |
440 | |
441 | mutex_lock(&devices_mutex); | |
442 | list_add_tail(&dev->list, &ubiblock_devices); | |
443 | mutex_unlock(&devices_mutex); | |
444 | ||
445 | /* Must be the last step: anyone can call file ops from now on */ | |
446 | add_disk(dev->gd); | |
32608703 TB |
447 | dev_info(disk_to_dev(dev->gd), "created from ubi%d:%d(%s)", |
448 | dev->ubi_num, dev->vol_id, vi->name); | |
9d54c8a3 EG |
449 | return 0; |
450 | ||
451 | out_free_queue: | |
452 | blk_cleanup_queue(dev->rq); | |
ff1f48ee RW |
453 | out_free_tags: |
454 | blk_mq_free_tag_set(&dev->tag_set); | |
2bf50d42 DE |
455 | out_remove_minor: |
456 | idr_remove(&ubiblock_minor_idr, gd->first_minor); | |
9d54c8a3 EG |
457 | out_put_disk: |
458 | put_disk(dev->gd); | |
459 | out_free_dev: | |
460 | kfree(dev); | |
461 | ||
462 | return ret; | |
463 | } | |
464 | ||
465 | static void ubiblock_cleanup(struct ubiblock *dev) | |
466 | { | |
ff1f48ee | 467 | /* Stop new requests to arrive */ |
9d54c8a3 | 468 | del_gendisk(dev->gd); |
ff1f48ee RW |
469 | /* Flush pending work */ |
470 | destroy_workqueue(dev->wq); | |
471 | /* Finally destroy the blk queue */ | |
9d54c8a3 | 472 | blk_cleanup_queue(dev->rq); |
ff1f48ee | 473 | blk_mq_free_tag_set(&dev->tag_set); |
32608703 | 474 | dev_info(disk_to_dev(dev->gd), "released"); |
2bf50d42 | 475 | idr_remove(&ubiblock_minor_idr, dev->gd->first_minor); |
9d54c8a3 EG |
476 | put_disk(dev->gd); |
477 | } | |
478 | ||
4d283ee2 | 479 | int ubiblock_remove(struct ubi_volume_info *vi) |
9d54c8a3 EG |
480 | { |
481 | struct ubiblock *dev; | |
482 | ||
483 | mutex_lock(&devices_mutex); | |
484 | dev = find_dev_nolock(vi->ubi_num, vi->vol_id); | |
485 | if (!dev) { | |
486 | mutex_unlock(&devices_mutex); | |
487 | return -ENODEV; | |
488 | } | |
489 | ||
490 | /* Found a device, let's lock it so we can check if it's busy */ | |
491 | mutex_lock(&dev->dev_mutex); | |
492 | if (dev->refcnt > 0) { | |
493 | mutex_unlock(&dev->dev_mutex); | |
494 | mutex_unlock(&devices_mutex); | |
495 | return -EBUSY; | |
496 | } | |
497 | ||
498 | /* Remove from device list */ | |
499 | list_del(&dev->list); | |
500 | mutex_unlock(&devices_mutex); | |
501 | ||
9d54c8a3 EG |
502 | ubiblock_cleanup(dev); |
503 | mutex_unlock(&dev->dev_mutex); | |
504 | kfree(dev); | |
505 | return 0; | |
506 | } | |
507 | ||
495f2bf6 | 508 | static int ubiblock_resize(struct ubi_volume_info *vi) |
9d54c8a3 EG |
509 | { |
510 | struct ubiblock *dev; | |
978d6496 | 511 | u64 disk_capacity = vi->used_bytes >> 9; |
9d54c8a3 EG |
512 | |
513 | /* | |
514 | * Need to lock the device list until we stop using the device, | |
4d283ee2 AB |
515 | * otherwise the device struct might get released in |
516 | * 'ubiblock_remove()'. | |
9d54c8a3 EG |
517 | */ |
518 | mutex_lock(&devices_mutex); | |
519 | dev = find_dev_nolock(vi->ubi_num, vi->vol_id); | |
520 | if (!dev) { | |
521 | mutex_unlock(&devices_mutex); | |
495f2bf6 | 522 | return -ENODEV; |
9d54c8a3 | 523 | } |
3df77072 CIK |
524 | if ((sector_t)disk_capacity != disk_capacity) { |
525 | mutex_unlock(&devices_mutex); | |
32608703 TB |
526 | dev_warn(disk_to_dev(dev->gd), "the volume is too big (%d LEBs), cannot resize", |
527 | vi->size); | |
3df77072 CIK |
528 | return -EFBIG; |
529 | } | |
9d54c8a3 EG |
530 | |
531 | mutex_lock(&dev->dev_mutex); | |
06d9c290 EG |
532 | |
533 | if (get_capacity(dev->gd) != disk_capacity) { | |
534 | set_capacity(dev->gd, disk_capacity); | |
32608703 TB |
535 | dev_info(disk_to_dev(dev->gd), "resized to %lld bytes", |
536 | vi->used_bytes); | |
06d9c290 | 537 | } |
9d54c8a3 EG |
538 | mutex_unlock(&dev->dev_mutex); |
539 | mutex_unlock(&devices_mutex); | |
495f2bf6 | 540 | return 0; |
9d54c8a3 EG |
541 | } |
542 | ||
543 | static int ubiblock_notify(struct notifier_block *nb, | |
544 | unsigned long notification_type, void *ns_ptr) | |
545 | { | |
546 | struct ubi_notification *nt = ns_ptr; | |
547 | ||
548 | switch (notification_type) { | |
549 | case UBI_VOLUME_ADDED: | |
550 | /* | |
4d283ee2 | 551 | * We want to enforce explicit block device creation for |
9d54c8a3 EG |
552 | * volumes, so when a volume is added we do nothing. |
553 | */ | |
554 | break; | |
555 | case UBI_VOLUME_REMOVED: | |
4d283ee2 | 556 | ubiblock_remove(&nt->vi); |
9d54c8a3 EG |
557 | break; |
558 | case UBI_VOLUME_RESIZED: | |
559 | ubiblock_resize(&nt->vi); | |
560 | break; | |
06d9c290 EG |
561 | case UBI_VOLUME_UPDATED: |
562 | /* | |
563 | * If the volume is static, a content update might mean the | |
564 | * size (i.e. used_bytes) was also changed. | |
565 | */ | |
566 | if (nt->vi.vol_type == UBI_STATIC_VOLUME) | |
567 | ubiblock_resize(&nt->vi); | |
568 | break; | |
9d54c8a3 EG |
569 | default: |
570 | break; | |
571 | } | |
572 | return NOTIFY_OK; | |
573 | } | |
574 | ||
575 | static struct notifier_block ubiblock_notifier = { | |
576 | .notifier_call = ubiblock_notify, | |
577 | }; | |
578 | ||
579 | static struct ubi_volume_desc * __init | |
580 | open_volume_desc(const char *name, int ubi_num, int vol_id) | |
581 | { | |
582 | if (ubi_num == -1) | |
583 | /* No ubi num, name must be a vol device path */ | |
584 | return ubi_open_volume_path(name, UBI_READONLY); | |
585 | else if (vol_id == -1) | |
586 | /* No vol_id, must be vol_name */ | |
587 | return ubi_open_volume_nm(ubi_num, name, UBI_READONLY); | |
588 | else | |
589 | return ubi_open_volume(ubi_num, vol_id, UBI_READONLY); | |
590 | } | |
591 | ||
1440061b | 592 | static void __init ubiblock_create_from_param(void) |
9d54c8a3 | 593 | { |
1440061b | 594 | int i, ret = 0; |
9d54c8a3 EG |
595 | struct ubiblock_param *p; |
596 | struct ubi_volume_desc *desc; | |
597 | struct ubi_volume_info vi; | |
598 | ||
1440061b DE |
599 | /* |
600 | * If there is an error creating one of the ubiblocks, continue on to | |
601 | * create the following ubiblocks. This helps in a circumstance where | |
602 | * the kernel command-line specifies multiple block devices and some | |
603 | * may be broken, but we still want the working ones to come up. | |
604 | */ | |
9d54c8a3 EG |
605 | for (i = 0; i < ubiblock_devs; i++) { |
606 | p = &ubiblock_param[i]; | |
607 | ||
608 | desc = open_volume_desc(p->name, p->ubi_num, p->vol_id); | |
609 | if (IS_ERR(desc)) { | |
1440061b DE |
610 | pr_err( |
611 | "UBI: block: can't open volume on ubi%d_%d, err=%ld", | |
612 | p->ubi_num, p->vol_id, PTR_ERR(desc)); | |
613 | continue; | |
9d54c8a3 EG |
614 | } |
615 | ||
616 | ubi_get_volume_info(desc, &vi); | |
617 | ubi_close_volume(desc); | |
618 | ||
4d283ee2 | 619 | ret = ubiblock_create(&vi); |
9d54c8a3 | 620 | if (ret) { |
1440061b DE |
621 | pr_err( |
622 | "UBI: block: can't add '%s' volume on ubi%d_%d, err=%d", | |
623 | vi.name, p->ubi_num, p->vol_id, ret); | |
624 | continue; | |
9d54c8a3 EG |
625 | } |
626 | } | |
9d54c8a3 EG |
627 | } |
628 | ||
4d283ee2 | 629 | static void ubiblock_remove_all(void) |
9d54c8a3 EG |
630 | { |
631 | struct ubiblock *next; | |
632 | struct ubiblock *dev; | |
633 | ||
634 | list_for_each_entry_safe(dev, next, &ubiblock_devices, list) { | |
9d54c8a3 EG |
635 | /* The module is being forcefully removed */ |
636 | WARN_ON(dev->desc); | |
637 | /* Remove from device list */ | |
638 | list_del(&dev->list); | |
639 | ubiblock_cleanup(dev); | |
640 | kfree(dev); | |
641 | } | |
642 | } | |
643 | ||
644 | int __init ubiblock_init(void) | |
645 | { | |
646 | int ret; | |
647 | ||
648 | ubiblock_major = register_blkdev(0, "ubiblock"); | |
649 | if (ubiblock_major < 0) | |
650 | return ubiblock_major; | |
651 | ||
1440061b DE |
652 | /* |
653 | * Attach block devices from 'block=' module param. | |
654 | * Even if one block device in the param list fails to come up, | |
655 | * still allow the module to load and leave any others up. | |
656 | */ | |
657 | ubiblock_create_from_param(); | |
9d54c8a3 EG |
658 | |
659 | /* | |
4d283ee2 AB |
660 | * Block devices are only created upon user requests, so we ignore |
661 | * existing volumes. | |
9d54c8a3 EG |
662 | */ |
663 | ret = ubi_register_volume_notifier(&ubiblock_notifier, 1); | |
664 | if (ret) | |
665 | goto err_unreg; | |
666 | return 0; | |
667 | ||
668 | err_unreg: | |
669 | unregister_blkdev(ubiblock_major, "ubiblock"); | |
4d283ee2 | 670 | ubiblock_remove_all(); |
9d54c8a3 EG |
671 | return ret; |
672 | } | |
673 | ||
674 | void __exit ubiblock_exit(void) | |
675 | { | |
676 | ubi_unregister_volume_notifier(&ubiblock_notifier); | |
4d283ee2 | 677 | ubiblock_remove_all(); |
9d54c8a3 EG |
678 | unregister_blkdev(ubiblock_major, "ubiblock"); |
679 | } |