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50acfb2b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9d54c8a3 EG |
2 | /* |
3 | * Copyright (c) 2014 Ezequiel Garcia | |
4 | * Copyright (c) 2011 Free Electrons | |
5 | * | |
6 | * Driver parameter handling strongly based on drivers/mtd/ubi/build.c | |
7 | * Copyright (c) International Business Machines Corp., 2006 | |
8 | * Copyright (c) Nokia Corporation, 2007 | |
9 | * Authors: Artem Bityutskiy, Frank Haverkamp | |
9d54c8a3 EG |
10 | */ |
11 | ||
12 | /* | |
13 | * Read-only block devices on top of UBI volumes | |
14 | * | |
15 | * A simple implementation to allow a block device to be layered on top of a | |
16 | * UBI volume. The implementation is provided by creating a static 1-to-1 | |
17 | * mapping between the block device and the UBI volume. | |
18 | * | |
19 | * The addressed byte is obtained from the addressed block sector, which is | |
20 | * mapped linearly into the corresponding LEB: | |
21 | * | |
22 | * LEB number = addressed byte / LEB size | |
23 | * | |
4d283ee2 AB |
24 | * This feature is compiled in the UBI core, and adds a 'block' parameter |
25 | * to allow early creation of block devices on top of UBI volumes. Runtime | |
26 | * block creation/removal for UBI volumes is provided through two UBI ioctls: | |
8af87188 | 27 | * UBI_IOCVOLCRBLK and UBI_IOCVOLRMBLK. |
9d54c8a3 EG |
28 | */ |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/list.h> | |
35 | #include <linux/mutex.h> | |
36 | #include <linux/slab.h> | |
9d54c8a3 EG |
37 | #include <linux/mtd/ubi.h> |
38 | #include <linux/workqueue.h> | |
39 | #include <linux/blkdev.h> | |
ff1f48ee | 40 | #include <linux/blk-mq.h> |
9d54c8a3 | 41 | #include <linux/hdreg.h> |
ff1f48ee | 42 | #include <linux/scatterlist.h> |
2bf50d42 | 43 | #include <linux/idr.h> |
9d54c8a3 EG |
44 | #include <asm/div64.h> |
45 | ||
46 | #include "ubi-media.h" | |
47 | #include "ubi.h" | |
48 | ||
49 | /* Maximum number of supported devices */ | |
50 | #define UBIBLOCK_MAX_DEVICES 32 | |
51 | ||
52 | /* Maximum length of the 'block=' parameter */ | |
53 | #define UBIBLOCK_PARAM_LEN 63 | |
54 | ||
55 | /* Maximum number of comma-separated items in the 'block=' parameter */ | |
56 | #define UBIBLOCK_PARAM_COUNT 2 | |
57 | ||
58 | struct ubiblock_param { | |
59 | int ubi_num; | |
60 | int vol_id; | |
61 | char name[UBIBLOCK_PARAM_LEN+1]; | |
62 | }; | |
63 | ||
ff1f48ee RW |
64 | struct ubiblock_pdu { |
65 | struct work_struct work; | |
66 | struct ubi_sgl usgl; | |
67 | }; | |
68 | ||
9d54c8a3 EG |
69 | /* Numbers of elements set in the @ubiblock_param array */ |
70 | static int ubiblock_devs __initdata; | |
71 | ||
72 | /* MTD devices specification parameters */ | |
73 | static struct ubiblock_param ubiblock_param[UBIBLOCK_MAX_DEVICES] __initdata; | |
74 | ||
75 | struct ubiblock { | |
76 | struct ubi_volume_desc *desc; | |
77 | int ubi_num; | |
78 | int vol_id; | |
79 | int refcnt; | |
80 | int leb_size; | |
81 | ||
82 | struct gendisk *gd; | |
83 | struct request_queue *rq; | |
84 | ||
85 | struct workqueue_struct *wq; | |
9d54c8a3 EG |
86 | |
87 | struct mutex dev_mutex; | |
9d54c8a3 | 88 | struct list_head list; |
ff1f48ee | 89 | struct blk_mq_tag_set tag_set; |
9d54c8a3 EG |
90 | }; |
91 | ||
92 | /* Linked list of all ubiblock instances */ | |
93 | static LIST_HEAD(ubiblock_devices); | |
7f29ae9f BB |
94 | static DEFINE_IDR(ubiblock_minor_idr); |
95 | /* Protects ubiblock_devices and ubiblock_minor_idr */ | |
9d54c8a3 EG |
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) { | |
32608703 | 114 | pr_warn("UBI: block: empty 'block=' parameter - ignored\n"); |
9d54c8a3 EG |
115 | return 0; |
116 | } | |
117 | ||
118 | if (len == UBIBLOCK_PARAM_LEN) { | |
32608703 TB |
119 | pr_err("UBI: block: parameter \"%s\" is too long, max. is %d\n", |
120 | val, UBIBLOCK_PARAM_LEN); | |
9d54c8a3 EG |
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 | ||
9c27847d | 159 | static const 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 | ||
ff1f48ee | 184 | static int ubiblock_read(struct ubiblock_pdu *pdu) |
9d54c8a3 | 185 | { |
ff1f48ee RW |
186 | int ret, leb, offset, bytes_left, to_read; |
187 | u64 pos; | |
188 | struct request *req = blk_mq_rq_from_pdu(pdu); | |
189 | struct ubiblock *dev = req->q->queuedata; | |
9d54c8a3 | 190 | |
ff1f48ee RW |
191 | to_read = blk_rq_bytes(req); |
192 | pos = blk_rq_pos(req) << 9; | |
9d54c8a3 EG |
193 | |
194 | /* Get LEB:offset address to read from */ | |
195 | offset = do_div(pos, dev->leb_size); | |
196 | leb = pos; | |
ff1f48ee | 197 | bytes_left = to_read; |
9d54c8a3 EG |
198 | |
199 | while (bytes_left) { | |
200 | /* | |
201 | * We can only read one LEB at a time. Therefore if the read | |
202 | * length is larger than one LEB size, we split the operation. | |
203 | */ | |
204 | if (offset + to_read > dev->leb_size) | |
205 | to_read = dev->leb_size - offset; | |
206 | ||
ff1f48ee RW |
207 | ret = ubi_read_sg(dev->desc, leb, &pdu->usgl, offset, to_read); |
208 | if (ret < 0) | |
9d54c8a3 EG |
209 | return ret; |
210 | ||
9d54c8a3 EG |
211 | bytes_left -= to_read; |
212 | to_read = bytes_left; | |
213 | leb += 1; | |
214 | offset = 0; | |
215 | } | |
216 | return 0; | |
217 | } | |
218 | ||
9d54c8a3 EG |
219 | static int ubiblock_open(struct block_device *bdev, fmode_t mode) |
220 | { | |
221 | struct ubiblock *dev = bdev->bd_disk->private_data; | |
222 | int ret; | |
223 | ||
224 | mutex_lock(&dev->dev_mutex); | |
225 | if (dev->refcnt > 0) { | |
226 | /* | |
227 | * The volume is already open, just increase the reference | |
228 | * counter. | |
229 | */ | |
230 | goto out_done; | |
231 | } | |
232 | ||
233 | /* | |
234 | * We want users to be aware they should only mount us as read-only. | |
235 | * It's just a paranoid check, as write requests will get rejected | |
236 | * in any case. | |
237 | */ | |
238 | if (mode & FMODE_WRITE) { | |
78a8dfba | 239 | ret = -EROFS; |
9d54c8a3 EG |
240 | goto out_unlock; |
241 | } | |
242 | ||
243 | dev->desc = ubi_open_volume(dev->ubi_num, dev->vol_id, UBI_READONLY); | |
244 | if (IS_ERR(dev->desc)) { | |
32608703 TB |
245 | dev_err(disk_to_dev(dev->gd), "failed to open ubi volume %d_%d", |
246 | dev->ubi_num, dev->vol_id); | |
9d54c8a3 EG |
247 | ret = PTR_ERR(dev->desc); |
248 | dev->desc = NULL; | |
249 | goto out_unlock; | |
250 | } | |
251 | ||
252 | out_done: | |
253 | dev->refcnt++; | |
254 | mutex_unlock(&dev->dev_mutex); | |
255 | return 0; | |
256 | ||
257 | out_unlock: | |
258 | mutex_unlock(&dev->dev_mutex); | |
259 | return ret; | |
260 | } | |
261 | ||
262 | static void ubiblock_release(struct gendisk *gd, fmode_t mode) | |
263 | { | |
264 | struct ubiblock *dev = gd->private_data; | |
265 | ||
266 | mutex_lock(&dev->dev_mutex); | |
267 | dev->refcnt--; | |
268 | if (dev->refcnt == 0) { | |
269 | ubi_close_volume(dev->desc); | |
270 | dev->desc = NULL; | |
271 | } | |
272 | mutex_unlock(&dev->dev_mutex); | |
273 | } | |
274 | ||
275 | static int ubiblock_getgeo(struct block_device *bdev, struct hd_geometry *geo) | |
276 | { | |
277 | /* Some tools might require this information */ | |
278 | geo->heads = 1; | |
279 | geo->cylinders = 1; | |
280 | geo->sectors = get_capacity(bdev->bd_disk); | |
281 | geo->start = 0; | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static const struct block_device_operations ubiblock_ops = { | |
286 | .owner = THIS_MODULE, | |
287 | .open = ubiblock_open, | |
288 | .release = ubiblock_release, | |
289 | .getgeo = ubiblock_getgeo, | |
290 | }; | |
291 | ||
ff1f48ee RW |
292 | static void ubiblock_do_work(struct work_struct *work) |
293 | { | |
294 | int ret; | |
295 | struct ubiblock_pdu *pdu = container_of(work, struct ubiblock_pdu, work); | |
296 | struct request *req = blk_mq_rq_from_pdu(pdu); | |
786d4e01 CH |
297 | struct req_iterator iter; |
298 | struct bio_vec bvec; | |
ff1f48ee RW |
299 | |
300 | blk_mq_start_request(req); | |
832b52a1 RW |
301 | |
302 | /* | |
303 | * It is safe to ignore the return value of blk_rq_map_sg() because | |
304 | * the number of sg entries is limited to UBI_MAX_SG_COUNT | |
305 | * and ubi_read_sg() will check that limit. | |
306 | */ | |
ff1f48ee RW |
307 | blk_rq_map_sg(req->q, req, pdu->usgl.sg); |
308 | ||
309 | ret = ubiblock_read(pdu); | |
786d4e01 CH |
310 | |
311 | rq_for_each_segment(bvec, req, iter) | |
312 | flush_dcache_page(bvec.bv_page); | |
98fb1ffd | 313 | |
2a842aca | 314 | blk_mq_end_request(req, errno_to_blk_status(ret)); |
ff1f48ee RW |
315 | } |
316 | ||
fc17b653 | 317 | static blk_status_t ubiblock_queue_rq(struct blk_mq_hw_ctx *hctx, |
ff1f48ee RW |
318 | const struct blk_mq_queue_data *bd) |
319 | { | |
320 | struct request *req = bd->rq; | |
321 | struct ubiblock *dev = hctx->queue->queuedata; | |
322 | struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req); | |
323 | ||
aebf526b CH |
324 | switch (req_op(req)) { |
325 | case REQ_OP_READ: | |
326 | ubi_sgl_init(&pdu->usgl); | |
327 | queue_work(dev->wq, &pdu->work); | |
fc17b653 | 328 | return BLK_STS_OK; |
aebf526b | 329 | default: |
fc17b653 | 330 | return BLK_STS_IOERR; |
aebf526b | 331 | } |
ff1f48ee | 332 | |
ff1f48ee RW |
333 | } |
334 | ||
d6296d39 CH |
335 | static int ubiblock_init_request(struct blk_mq_tag_set *set, |
336 | struct request *req, unsigned int hctx_idx, | |
337 | unsigned int numa_node) | |
ff1f48ee RW |
338 | { |
339 | struct ubiblock_pdu *pdu = blk_mq_rq_to_pdu(req); | |
340 | ||
341 | sg_init_table(pdu->usgl.sg, UBI_MAX_SG_COUNT); | |
342 | INIT_WORK(&pdu->work, ubiblock_do_work); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
f363b089 | 347 | static const struct blk_mq_ops ubiblock_mq_ops = { |
ff1f48ee RW |
348 | .queue_rq = ubiblock_queue_rq, |
349 | .init_request = ubiblock_init_request, | |
ff1f48ee RW |
350 | }; |
351 | ||
e46131b9 RW |
352 | static int calc_disk_capacity(struct ubi_volume_info *vi, u64 *disk_capacity) |
353 | { | |
354 | u64 size = vi->used_bytes >> 9; | |
355 | ||
356 | if (vi->used_bytes % 512) { | |
357 | pr_warn("UBI: block: volume size is not a multiple of 512, " | |
358 | "last %llu bytes are ignored!\n", | |
359 | vi->used_bytes - (size << 9)); | |
360 | } | |
361 | ||
362 | if ((sector_t)size != size) | |
363 | return -EFBIG; | |
364 | ||
365 | *disk_capacity = size; | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
4d283ee2 | 370 | int ubiblock_create(struct ubi_volume_info *vi) |
9d54c8a3 EG |
371 | { |
372 | struct ubiblock *dev; | |
373 | struct gendisk *gd; | |
e46131b9 | 374 | u64 disk_capacity; |
9d54c8a3 EG |
375 | int ret; |
376 | ||
e46131b9 RW |
377 | ret = calc_disk_capacity(vi, &disk_capacity); |
378 | if (ret) { | |
379 | return ret; | |
380 | } | |
381 | ||
9d54c8a3 EG |
382 | /* Check that the volume isn't already handled */ |
383 | mutex_lock(&devices_mutex); | |
384 | if (find_dev_nolock(vi->ubi_num, vi->vol_id)) { | |
7f29ae9f BB |
385 | ret = -EEXIST; |
386 | goto out_unlock; | |
9d54c8a3 | 387 | } |
9d54c8a3 EG |
388 | |
389 | dev = kzalloc(sizeof(struct ubiblock), GFP_KERNEL); | |
7f29ae9f BB |
390 | if (!dev) { |
391 | ret = -ENOMEM; | |
392 | goto out_unlock; | |
393 | } | |
9d54c8a3 EG |
394 | |
395 | mutex_init(&dev->dev_mutex); | |
396 | ||
397 | dev->ubi_num = vi->ubi_num; | |
398 | dev->vol_id = vi->vol_id; | |
399 | dev->leb_size = vi->usable_leb_size; | |
400 | ||
77567b25 CH |
401 | dev->tag_set.ops = &ubiblock_mq_ops; |
402 | dev->tag_set.queue_depth = 64; | |
403 | dev->tag_set.numa_node = NUMA_NO_NODE; | |
404 | dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; | |
405 | dev->tag_set.cmd_size = sizeof(struct ubiblock_pdu); | |
406 | dev->tag_set.driver_data = dev; | |
407 | dev->tag_set.nr_hw_queues = 1; | |
408 | ||
409 | ret = blk_mq_alloc_tag_set(&dev->tag_set); | |
410 | if (ret) { | |
411 | dev_err(disk_to_dev(dev->gd), "blk_mq_alloc_tag_set failed"); | |
6c97bb34 | 412 | goto out_free_dev; |
77567b25 CH |
413 | } |
414 | ||
415 | ||
9d54c8a3 | 416 | /* Initialize the gendisk of this ubiblock device */ |
77567b25 CH |
417 | gd = blk_mq_alloc_disk(&dev->tag_set, dev); |
418 | if (IS_ERR(gd)) { | |
419 | ret = PTR_ERR(gd); | |
420 | goto out_free_tags; | |
9d54c8a3 EG |
421 | } |
422 | ||
423 | gd->fops = &ubiblock_ops; | |
424 | gd->major = ubiblock_major; | |
77567b25 | 425 | gd->minors = 1; |
2bf50d42 DE |
426 | gd->first_minor = idr_alloc(&ubiblock_minor_idr, dev, 0, 0, GFP_KERNEL); |
427 | if (gd->first_minor < 0) { | |
428 | dev_err(disk_to_dev(gd), | |
429 | "block: dynamic minor allocation failed"); | |
430 | ret = -ENODEV; | |
77567b25 | 431 | goto out_cleanup_disk; |
2bf50d42 | 432 | } |
1ebe2e5f | 433 | gd->flags |= GENHD_FL_NO_PART; |
9d54c8a3 EG |
434 | gd->private_data = dev; |
435 | sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id); | |
9d54c8a3 EG |
436 | set_capacity(gd, disk_capacity); |
437 | dev->gd = gd; | |
438 | ||
77567b25 | 439 | dev->rq = gd->queue; |
ff1f48ee | 440 | blk_queue_max_segments(dev->rq, UBI_MAX_SG_COUNT); |
9d54c8a3 | 441 | |
9d54c8a3 EG |
442 | /* |
443 | * Create one workqueue per volume (per registered block device). | |
e079be2c | 444 | * Remember workqueues are cheap, they're not threads. |
9d54c8a3 | 445 | */ |
bebfef15 | 446 | dev->wq = alloc_workqueue("%s", 0, 0, gd->disk_name); |
151d6b21 HS |
447 | if (!dev->wq) { |
448 | ret = -ENOMEM; | |
77567b25 | 449 | goto out_remove_minor; |
151d6b21 | 450 | } |
9d54c8a3 | 451 | |
9d54c8a3 | 452 | list_add_tail(&dev->list, &ubiblock_devices); |
9d54c8a3 EG |
453 | |
454 | /* Must be the last step: anyone can call file ops from now on */ | |
ed739191 LC |
455 | ret = add_disk(dev->gd); |
456 | if (ret) | |
457 | goto out_destroy_wq; | |
458 | ||
32608703 TB |
459 | dev_info(disk_to_dev(dev->gd), "created from ubi%d:%d(%s)", |
460 | dev->ubi_num, dev->vol_id, vi->name); | |
7f29ae9f | 461 | mutex_unlock(&devices_mutex); |
9d54c8a3 EG |
462 | return 0; |
463 | ||
ed739191 LC |
464 | out_destroy_wq: |
465 | list_del(&dev->list); | |
466 | destroy_workqueue(dev->wq); | |
2bf50d42 DE |
467 | out_remove_minor: |
468 | idr_remove(&ubiblock_minor_idr, gd->first_minor); | |
77567b25 | 469 | out_cleanup_disk: |
8b9ab626 | 470 | put_disk(dev->gd); |
77567b25 CH |
471 | out_free_tags: |
472 | blk_mq_free_tag_set(&dev->tag_set); | |
9d54c8a3 EG |
473 | out_free_dev: |
474 | kfree(dev); | |
7f29ae9f BB |
475 | out_unlock: |
476 | mutex_unlock(&devices_mutex); | |
9d54c8a3 EG |
477 | |
478 | return ret; | |
479 | } | |
480 | ||
481 | static void ubiblock_cleanup(struct ubiblock *dev) | |
482 | { | |
ff1f48ee | 483 | /* Stop new requests to arrive */ |
9d54c8a3 | 484 | del_gendisk(dev->gd); |
ff1f48ee RW |
485 | /* Flush pending work */ |
486 | destroy_workqueue(dev->wq); | |
487 | /* Finally destroy the blk queue */ | |
32608703 | 488 | dev_info(disk_to_dev(dev->gd), "released"); |
8b9ab626 | 489 | put_disk(dev->gd); |
77567b25 | 490 | blk_mq_free_tag_set(&dev->tag_set); |
2bf50d42 | 491 | idr_remove(&ubiblock_minor_idr, dev->gd->first_minor); |
9d54c8a3 EG |
492 | } |
493 | ||
4d283ee2 | 494 | int ubiblock_remove(struct ubi_volume_info *vi) |
9d54c8a3 EG |
495 | { |
496 | struct ubiblock *dev; | |
7f29ae9f | 497 | int ret; |
9d54c8a3 EG |
498 | |
499 | mutex_lock(&devices_mutex); | |
500 | dev = find_dev_nolock(vi->ubi_num, vi->vol_id); | |
501 | if (!dev) { | |
7f29ae9f BB |
502 | ret = -ENODEV; |
503 | goto out_unlock; | |
9d54c8a3 EG |
504 | } |
505 | ||
506 | /* Found a device, let's lock it so we can check if it's busy */ | |
507 | mutex_lock(&dev->dev_mutex); | |
508 | if (dev->refcnt > 0) { | |
7f29ae9f BB |
509 | ret = -EBUSY; |
510 | goto out_unlock_dev; | |
9d54c8a3 EG |
511 | } |
512 | ||
513 | /* Remove from device list */ | |
514 | list_del(&dev->list); | |
9d54c8a3 EG |
515 | ubiblock_cleanup(dev); |
516 | mutex_unlock(&dev->dev_mutex); | |
7f29ae9f BB |
517 | mutex_unlock(&devices_mutex); |
518 | ||
9d54c8a3 EG |
519 | kfree(dev); |
520 | return 0; | |
7f29ae9f BB |
521 | |
522 | out_unlock_dev: | |
523 | mutex_unlock(&dev->dev_mutex); | |
524 | out_unlock: | |
525 | mutex_unlock(&devices_mutex); | |
526 | return ret; | |
9d54c8a3 EG |
527 | } |
528 | ||
495f2bf6 | 529 | static int ubiblock_resize(struct ubi_volume_info *vi) |
9d54c8a3 EG |
530 | { |
531 | struct ubiblock *dev; | |
e46131b9 RW |
532 | u64 disk_capacity; |
533 | int ret; | |
9d54c8a3 EG |
534 | |
535 | /* | |
536 | * Need to lock the device list until we stop using the device, | |
4d283ee2 AB |
537 | * otherwise the device struct might get released in |
538 | * 'ubiblock_remove()'. | |
9d54c8a3 EG |
539 | */ |
540 | mutex_lock(&devices_mutex); | |
541 | dev = find_dev_nolock(vi->ubi_num, vi->vol_id); | |
542 | if (!dev) { | |
543 | mutex_unlock(&devices_mutex); | |
495f2bf6 | 544 | return -ENODEV; |
9d54c8a3 | 545 | } |
e46131b9 RW |
546 | |
547 | ret = calc_disk_capacity(vi, &disk_capacity); | |
548 | if (ret) { | |
3df77072 | 549 | mutex_unlock(&devices_mutex); |
e46131b9 RW |
550 | if (ret == -EFBIG) { |
551 | dev_warn(disk_to_dev(dev->gd), | |
552 | "the volume is too big (%d LEBs), cannot resize", | |
553 | vi->size); | |
554 | } | |
555 | return ret; | |
3df77072 | 556 | } |
9d54c8a3 EG |
557 | |
558 | mutex_lock(&dev->dev_mutex); | |
06d9c290 EG |
559 | |
560 | if (get_capacity(dev->gd) != disk_capacity) { | |
561 | set_capacity(dev->gd, disk_capacity); | |
32608703 TB |
562 | dev_info(disk_to_dev(dev->gd), "resized to %lld bytes", |
563 | vi->used_bytes); | |
06d9c290 | 564 | } |
9d54c8a3 EG |
565 | mutex_unlock(&dev->dev_mutex); |
566 | mutex_unlock(&devices_mutex); | |
495f2bf6 | 567 | return 0; |
9d54c8a3 EG |
568 | } |
569 | ||
570 | static int ubiblock_notify(struct notifier_block *nb, | |
571 | unsigned long notification_type, void *ns_ptr) | |
572 | { | |
573 | struct ubi_notification *nt = ns_ptr; | |
574 | ||
575 | switch (notification_type) { | |
576 | case UBI_VOLUME_ADDED: | |
577 | /* | |
4d283ee2 | 578 | * We want to enforce explicit block device creation for |
9d54c8a3 EG |
579 | * volumes, so when a volume is added we do nothing. |
580 | */ | |
581 | break; | |
582 | case UBI_VOLUME_REMOVED: | |
4d283ee2 | 583 | ubiblock_remove(&nt->vi); |
9d54c8a3 EG |
584 | break; |
585 | case UBI_VOLUME_RESIZED: | |
586 | ubiblock_resize(&nt->vi); | |
587 | break; | |
06d9c290 EG |
588 | case UBI_VOLUME_UPDATED: |
589 | /* | |
590 | * If the volume is static, a content update might mean the | |
591 | * size (i.e. used_bytes) was also changed. | |
592 | */ | |
593 | if (nt->vi.vol_type == UBI_STATIC_VOLUME) | |
594 | ubiblock_resize(&nt->vi); | |
595 | break; | |
9d54c8a3 EG |
596 | default: |
597 | break; | |
598 | } | |
599 | return NOTIFY_OK; | |
600 | } | |
601 | ||
602 | static struct notifier_block ubiblock_notifier = { | |
603 | .notifier_call = ubiblock_notify, | |
604 | }; | |
605 | ||
606 | static struct ubi_volume_desc * __init | |
607 | open_volume_desc(const char *name, int ubi_num, int vol_id) | |
608 | { | |
609 | if (ubi_num == -1) | |
610 | /* No ubi num, name must be a vol device path */ | |
611 | return ubi_open_volume_path(name, UBI_READONLY); | |
612 | else if (vol_id == -1) | |
613 | /* No vol_id, must be vol_name */ | |
614 | return ubi_open_volume_nm(ubi_num, name, UBI_READONLY); | |
615 | else | |
616 | return ubi_open_volume(ubi_num, vol_id, UBI_READONLY); | |
617 | } | |
618 | ||
1440061b | 619 | static void __init ubiblock_create_from_param(void) |
9d54c8a3 | 620 | { |
1440061b | 621 | int i, ret = 0; |
9d54c8a3 EG |
622 | struct ubiblock_param *p; |
623 | struct ubi_volume_desc *desc; | |
624 | struct ubi_volume_info vi; | |
625 | ||
1440061b DE |
626 | /* |
627 | * If there is an error creating one of the ubiblocks, continue on to | |
628 | * create the following ubiblocks. This helps in a circumstance where | |
629 | * the kernel command-line specifies multiple block devices and some | |
630 | * may be broken, but we still want the working ones to come up. | |
631 | */ | |
9d54c8a3 EG |
632 | for (i = 0; i < ubiblock_devs; i++) { |
633 | p = &ubiblock_param[i]; | |
634 | ||
635 | desc = open_volume_desc(p->name, p->ubi_num, p->vol_id); | |
636 | if (IS_ERR(desc)) { | |
1440061b | 637 | pr_err( |
b62fc462 | 638 | "UBI: block: can't open volume on ubi%d_%d, err=%ld\n", |
1440061b DE |
639 | p->ubi_num, p->vol_id, PTR_ERR(desc)); |
640 | continue; | |
9d54c8a3 EG |
641 | } |
642 | ||
643 | ubi_get_volume_info(desc, &vi); | |
644 | ubi_close_volume(desc); | |
645 | ||
4d283ee2 | 646 | ret = ubiblock_create(&vi); |
9d54c8a3 | 647 | if (ret) { |
1440061b | 648 | pr_err( |
b62fc462 | 649 | "UBI: block: can't add '%s' volume on ubi%d_%d, err=%d\n", |
1440061b DE |
650 | vi.name, p->ubi_num, p->vol_id, ret); |
651 | continue; | |
9d54c8a3 EG |
652 | } |
653 | } | |
9d54c8a3 EG |
654 | } |
655 | ||
4d283ee2 | 656 | static void ubiblock_remove_all(void) |
9d54c8a3 EG |
657 | { |
658 | struct ubiblock *next; | |
659 | struct ubiblock *dev; | |
660 | ||
7f29ae9f | 661 | mutex_lock(&devices_mutex); |
9d54c8a3 | 662 | list_for_each_entry_safe(dev, next, &ubiblock_devices, list) { |
9d54c8a3 EG |
663 | /* The module is being forcefully removed */ |
664 | WARN_ON(dev->desc); | |
665 | /* Remove from device list */ | |
666 | list_del(&dev->list); | |
667 | ubiblock_cleanup(dev); | |
668 | kfree(dev); | |
669 | } | |
7f29ae9f | 670 | mutex_unlock(&devices_mutex); |
9d54c8a3 EG |
671 | } |
672 | ||
673 | int __init ubiblock_init(void) | |
674 | { | |
675 | int ret; | |
676 | ||
677 | ubiblock_major = register_blkdev(0, "ubiblock"); | |
678 | if (ubiblock_major < 0) | |
679 | return ubiblock_major; | |
680 | ||
1440061b DE |
681 | /* |
682 | * Attach block devices from 'block=' module param. | |
683 | * Even if one block device in the param list fails to come up, | |
684 | * still allow the module to load and leave any others up. | |
685 | */ | |
686 | ubiblock_create_from_param(); | |
9d54c8a3 EG |
687 | |
688 | /* | |
4d283ee2 AB |
689 | * Block devices are only created upon user requests, so we ignore |
690 | * existing volumes. | |
9d54c8a3 EG |
691 | */ |
692 | ret = ubi_register_volume_notifier(&ubiblock_notifier, 1); | |
693 | if (ret) | |
694 | goto err_unreg; | |
695 | return 0; | |
696 | ||
697 | err_unreg: | |
698 | unregister_blkdev(ubiblock_major, "ubiblock"); | |
4d283ee2 | 699 | ubiblock_remove_all(); |
9d54c8a3 EG |
700 | return ret; |
701 | } | |
702 | ||
703 | void __exit ubiblock_exit(void) | |
704 | { | |
705 | ubi_unregister_volume_notifier(&ubiblock_notifier); | |
4d283ee2 | 706 | ubiblock_remove_all(); |
9d54c8a3 EG |
707 | unregister_blkdev(ubiblock_major, "ubiblock"); |
708 | } |