Commit | Line | Data |
---|---|---|
3d6392cf JA |
1 | /* |
2 | * bsg.c - block layer implementation of the sg v3 interface | |
3 | * | |
4 | * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs | |
5 | * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com> | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General Public | |
8 | * License version 2. See the file "COPYING" in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | */ | |
12 | /* | |
13 | * TODO | |
14 | * - Should this get merged, block/scsi_ioctl.c will be migrated into | |
15 | * this file. To keep maintenance down, it's easier to have them | |
16 | * seperated right now. | |
17 | * | |
18 | */ | |
3d6392cf JA |
19 | #include <linux/module.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/file.h> | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/poll.h> | |
24 | #include <linux/cdev.h> | |
25 | #include <linux/percpu.h> | |
26 | #include <linux/uio.h> | |
27 | #include <linux/bsg.h> | |
28 | ||
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_ioctl.h> | |
31 | #include <scsi/scsi_cmnd.h> | |
4e2872d6 FT |
32 | #include <scsi/scsi_device.h> |
33 | #include <scsi/scsi_driver.h> | |
3d6392cf JA |
34 | #include <scsi/sg.h> |
35 | ||
0ed081ce FT |
36 | #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" |
37 | #define BSG_VERSION "0.4" | |
3d6392cf | 38 | |
3d6392cf | 39 | struct bsg_device { |
3d6392cf JA |
40 | request_queue_t *queue; |
41 | spinlock_t lock; | |
42 | struct list_head busy_list; | |
43 | struct list_head done_list; | |
44 | struct hlist_node dev_list; | |
45 | atomic_t ref_count; | |
46 | int minor; | |
47 | int queued_cmds; | |
48 | int done_cmds; | |
3d6392cf JA |
49 | wait_queue_head_t wq_done; |
50 | wait_queue_head_t wq_free; | |
d351af01 | 51 | char name[BUS_ID_SIZE]; |
3d6392cf JA |
52 | int max_queue; |
53 | unsigned long flags; | |
54 | }; | |
55 | ||
56 | enum { | |
57 | BSG_F_BLOCK = 1, | |
58 | BSG_F_WRITE_PERM = 2, | |
59 | }; | |
60 | ||
5309cb38 | 61 | #define BSG_DEFAULT_CMDS 64 |
292b7f27 | 62 | #define BSG_MAX_DEVS 32768 |
3d6392cf JA |
63 | |
64 | #undef BSG_DEBUG | |
65 | ||
66 | #ifdef BSG_DEBUG | |
67 | #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args) | |
68 | #else | |
69 | #define dprintk(fmt, args...) | |
70 | #endif | |
71 | ||
3d6392cf | 72 | static DEFINE_MUTEX(bsg_mutex); |
292b7f27 | 73 | static int bsg_device_nr, bsg_minor_idx; |
3d6392cf | 74 | |
25fd1643 | 75 | #define BSG_LIST_ARRAY_SIZE 8 |
25fd1643 | 76 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
3d6392cf JA |
77 | |
78 | static struct class *bsg_class; | |
79 | static LIST_HEAD(bsg_class_list); | |
46f6ef4a | 80 | static int bsg_major; |
3d6392cf | 81 | |
5309cb38 JA |
82 | static struct kmem_cache *bsg_cmd_cachep; |
83 | ||
3d6392cf JA |
84 | /* |
85 | * our internal command type | |
86 | */ | |
87 | struct bsg_command { | |
88 | struct bsg_device *bd; | |
89 | struct list_head list; | |
90 | struct request *rq; | |
91 | struct bio *bio; | |
2c9ecdf4 | 92 | struct bio *bidi_bio; |
3d6392cf | 93 | int err; |
70e36ece FT |
94 | struct sg_io_v4 hdr; |
95 | struct sg_io_v4 __user *uhdr; | |
3d6392cf JA |
96 | char sense[SCSI_SENSE_BUFFERSIZE]; |
97 | }; | |
98 | ||
99 | static void bsg_free_command(struct bsg_command *bc) | |
100 | { | |
101 | struct bsg_device *bd = bc->bd; | |
3d6392cf JA |
102 | unsigned long flags; |
103 | ||
5309cb38 | 104 | kmem_cache_free(bsg_cmd_cachep, bc); |
3d6392cf JA |
105 | |
106 | spin_lock_irqsave(&bd->lock, flags); | |
107 | bd->queued_cmds--; | |
3d6392cf JA |
108 | spin_unlock_irqrestore(&bd->lock, flags); |
109 | ||
110 | wake_up(&bd->wq_free); | |
111 | } | |
112 | ||
e7d72173 | 113 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
3d6392cf | 114 | { |
e7d72173 | 115 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
3d6392cf JA |
116 | |
117 | spin_lock_irq(&bd->lock); | |
118 | ||
119 | if (bd->queued_cmds >= bd->max_queue) | |
120 | goto out; | |
121 | ||
3d6392cf | 122 | bd->queued_cmds++; |
3d6392cf JA |
123 | spin_unlock_irq(&bd->lock); |
124 | ||
25fd1643 | 125 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
5309cb38 JA |
126 | if (unlikely(!bc)) { |
127 | spin_lock_irq(&bd->lock); | |
7e75d730 | 128 | bd->queued_cmds--; |
e7d72173 | 129 | bc = ERR_PTR(-ENOMEM); |
7e75d730 | 130 | goto out; |
5309cb38 JA |
131 | } |
132 | ||
3d6392cf JA |
133 | bc->bd = bd; |
134 | INIT_LIST_HEAD(&bc->list); | |
5309cb38 | 135 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
3d6392cf JA |
136 | return bc; |
137 | out: | |
3d6392cf JA |
138 | spin_unlock_irq(&bd->lock); |
139 | return bc; | |
140 | } | |
141 | ||
1c1133e1 | 142 | static inline struct hlist_head *bsg_dev_idx_hash(int index) |
3d6392cf | 143 | { |
1c1133e1 | 144 | return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cf JA |
145 | } |
146 | ||
25fd1643 | 147 | static int bsg_io_schedule(struct bsg_device *bd) |
3d6392cf JA |
148 | { |
149 | DEFINE_WAIT(wait); | |
150 | int ret = 0; | |
151 | ||
152 | spin_lock_irq(&bd->lock); | |
153 | ||
154 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
155 | ||
156 | /* | |
157 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no | |
158 | * work to do", even though we return -ENOSPC after this same test | |
159 | * during bsg_write() -- there, it means our buffer can't have more | |
160 | * bsg_commands added to it, thus has no space left. | |
161 | */ | |
162 | if (bd->done_cmds == bd->queued_cmds) { | |
163 | ret = -ENODATA; | |
164 | goto unlock; | |
165 | } | |
166 | ||
167 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { | |
168 | ret = -EAGAIN; | |
169 | goto unlock; | |
170 | } | |
171 | ||
25fd1643 | 172 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
3d6392cf JA |
173 | spin_unlock_irq(&bd->lock); |
174 | io_schedule(); | |
175 | finish_wait(&bd->wq_done, &wait); | |
176 | ||
3d6392cf JA |
177 | return ret; |
178 | unlock: | |
179 | spin_unlock_irq(&bd->lock); | |
180 | return ret; | |
181 | } | |
182 | ||
70e36ece FT |
183 | static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq, |
184 | struct sg_io_v4 *hdr, int has_write_perm) | |
185 | { | |
186 | memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ | |
187 | ||
188 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, | |
189 | hdr->request_len)) | |
190 | return -EFAULT; | |
15d10b61 FT |
191 | |
192 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { | |
193 | if (blk_verify_command(rq->cmd, has_write_perm)) | |
194 | return -EPERM; | |
195 | } else if (!capable(CAP_SYS_RAWIO)) | |
70e36ece FT |
196 | return -EPERM; |
197 | ||
198 | /* | |
199 | * fill in request structure | |
200 | */ | |
201 | rq->cmd_len = hdr->request_len; | |
202 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
203 | ||
204 | rq->timeout = (hdr->timeout * HZ) / 1000; | |
205 | if (!rq->timeout) | |
206 | rq->timeout = q->sg_timeout; | |
207 | if (!rq->timeout) | |
208 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
3d6392cf | 213 | /* |
70e36ece | 214 | * Check if sg_io_v4 from user is allowed and valid |
3d6392cf JA |
215 | */ |
216 | static int | |
70e36ece | 217 | bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw) |
3d6392cf | 218 | { |
15d10b61 FT |
219 | int ret = 0; |
220 | ||
70e36ece | 221 | if (hdr->guard != 'Q') |
3d6392cf | 222 | return -EINVAL; |
70e36ece | 223 | if (hdr->request_len > BLK_MAX_CDB) |
3d6392cf | 224 | return -EINVAL; |
70e36ece FT |
225 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
226 | hdr->din_xfer_len > (q->max_sectors << 9)) | |
3d6392cf JA |
227 | return -EIO; |
228 | ||
15d10b61 FT |
229 | switch (hdr->protocol) { |
230 | case BSG_PROTOCOL_SCSI: | |
231 | switch (hdr->subprotocol) { | |
232 | case BSG_SUB_PROTOCOL_SCSI_CMD: | |
233 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: | |
234 | break; | |
235 | default: | |
236 | ret = -EINVAL; | |
237 | } | |
238 | break; | |
239 | default: | |
240 | ret = -EINVAL; | |
241 | } | |
70e36ece | 242 | |
70e36ece | 243 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
15d10b61 | 244 | return ret; |
3d6392cf JA |
245 | } |
246 | ||
247 | /* | |
70e36ece | 248 | * map sg_io_v4 to a request. |
3d6392cf JA |
249 | */ |
250 | static struct request * | |
70e36ece | 251 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
3d6392cf JA |
252 | { |
253 | request_queue_t *q = bd->queue; | |
2c9ecdf4 | 254 | struct request *rq, *next_rq = NULL; |
25fd1643 | 255 | int ret, rw; |
70e36ece FT |
256 | unsigned int dxfer_len; |
257 | void *dxferp = NULL; | |
3d6392cf | 258 | |
70e36ece FT |
259 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
260 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, | |
261 | hdr->din_xfer_len); | |
3d6392cf | 262 | |
70e36ece | 263 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
3d6392cf JA |
264 | if (ret) |
265 | return ERR_PTR(ret); | |
266 | ||
267 | /* | |
268 | * map scatter-gather elements seperately and string them to request | |
269 | */ | |
270 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
2c9ecdf4 FT |
271 | if (!rq) |
272 | return ERR_PTR(-ENOMEM); | |
70e36ece FT |
273 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, |
274 | &bd->flags)); | |
2c9ecdf4 FT |
275 | if (ret) |
276 | goto out; | |
277 | ||
278 | if (rw == WRITE && hdr->din_xfer_len) { | |
279 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { | |
280 | ret = -EOPNOTSUPP; | |
281 | goto out; | |
282 | } | |
283 | ||
284 | next_rq = blk_get_request(q, READ, GFP_KERNEL); | |
285 | if (!next_rq) { | |
286 | ret = -ENOMEM; | |
287 | goto out; | |
288 | } | |
289 | rq->next_rq = next_rq; | |
290 | ||
291 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
292 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); | |
293 | if (ret) | |
294 | goto out; | |
3d6392cf JA |
295 | } |
296 | ||
70e36ece FT |
297 | if (hdr->dout_xfer_len) { |
298 | dxfer_len = hdr->dout_xfer_len; | |
299 | dxferp = (void*)(unsigned long)hdr->dout_xferp; | |
300 | } else if (hdr->din_xfer_len) { | |
301 | dxfer_len = hdr->din_xfer_len; | |
302 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
303 | } else | |
304 | dxfer_len = 0; | |
305 | ||
306 | if (dxfer_len) { | |
307 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); | |
2c9ecdf4 FT |
308 | if (ret) |
309 | goto out; | |
3d6392cf | 310 | } |
3d6392cf | 311 | return rq; |
2c9ecdf4 FT |
312 | out: |
313 | blk_put_request(rq); | |
314 | if (next_rq) { | |
315 | blk_rq_unmap_user(next_rq->bio); | |
316 | blk_put_request(next_rq); | |
317 | } | |
318 | return ERR_PTR(ret); | |
3d6392cf JA |
319 | } |
320 | ||
321 | /* | |
322 | * async completion call-back from the block layer, when scsi/ide/whatever | |
323 | * calls end_that_request_last() on a request | |
324 | */ | |
325 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
326 | { | |
327 | struct bsg_command *bc = rq->end_io_data; | |
328 | struct bsg_device *bd = bc->bd; | |
329 | unsigned long flags; | |
330 | ||
5309cb38 JA |
331 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
332 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
333 | |
334 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
335 | ||
336 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
337 | list_move_tail(&bc->list, &bd->done_list); |
338 | bd->done_cmds++; | |
3d6392cf | 339 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
340 | |
341 | wake_up(&bd->wq_done); | |
3d6392cf JA |
342 | } |
343 | ||
344 | /* | |
345 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
346 | * layer for io | |
347 | */ | |
348 | static void bsg_add_command(struct bsg_device *bd, request_queue_t *q, | |
349 | struct bsg_command *bc, struct request *rq) | |
350 | { | |
351 | rq->sense = bc->sense; | |
352 | rq->sense_len = 0; | |
353 | ||
354 | /* | |
355 | * add bc command to busy queue and submit rq for io | |
356 | */ | |
357 | bc->rq = rq; | |
358 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
359 | if (rq->next_rq) |
360 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
361 | bc->hdr.duration = jiffies; |
362 | spin_lock_irq(&bd->lock); | |
363 | list_add_tail(&bc->list, &bd->busy_list); | |
364 | spin_unlock_irq(&bd->lock); | |
365 | ||
366 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
367 | ||
368 | rq->end_io_data = bc; | |
d351af01 | 369 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
3d6392cf JA |
370 | } |
371 | ||
25fd1643 | 372 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
373 | { |
374 | struct bsg_command *bc = NULL; | |
375 | ||
376 | spin_lock_irq(&bd->lock); | |
377 | if (bd->done_cmds) { | |
25fd1643 JA |
378 | bc = list_entry(bd->done_list.next, struct bsg_command, list); |
379 | list_del(&bc->list); | |
380 | bd->done_cmds--; | |
3d6392cf JA |
381 | } |
382 | spin_unlock_irq(&bd->lock); | |
383 | ||
384 | return bc; | |
385 | } | |
386 | ||
387 | /* | |
388 | * Get a finished command from the done list | |
389 | */ | |
e7d72173 | 390 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
391 | { |
392 | struct bsg_command *bc; | |
393 | int ret; | |
394 | ||
395 | do { | |
396 | bc = bsg_next_done_cmd(bd); | |
397 | if (bc) | |
398 | break; | |
399 | ||
e7d72173 FT |
400 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
401 | bc = ERR_PTR(-EAGAIN); | |
402 | break; | |
403 | } | |
404 | ||
405 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 406 | if (ret) { |
e7d72173 | 407 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
408 | break; |
409 | } | |
410 | } while (1); | |
411 | ||
412 | dprintk("%s: returning done %p\n", bd->name, bc); | |
413 | ||
414 | return bc; | |
415 | } | |
416 | ||
70e36ece | 417 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 418 | struct bio *bio, struct bio *bidi_bio) |
70e36ece FT |
419 | { |
420 | int ret = 0; | |
421 | ||
422 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); | |
423 | /* | |
424 | * fill in all the output members | |
425 | */ | |
426 | hdr->device_status = status_byte(rq->errors); | |
427 | hdr->transport_status = host_byte(rq->errors); | |
428 | hdr->driver_status = driver_byte(rq->errors); | |
429 | hdr->info = 0; | |
430 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
431 | hdr->info |= SG_INFO_CHECK; | |
432 | hdr->din_resid = rq->data_len; | |
433 | hdr->response_len = 0; | |
434 | ||
435 | if (rq->sense_len && hdr->response) { | |
25fd1643 JA |
436 | int len = min_t(unsigned int, hdr->max_response_len, |
437 | rq->sense_len); | |
70e36ece FT |
438 | |
439 | ret = copy_to_user((void*)(unsigned long)hdr->response, | |
440 | rq->sense, len); | |
441 | if (!ret) | |
442 | hdr->response_len = len; | |
443 | else | |
444 | ret = -EFAULT; | |
445 | } | |
446 | ||
2c9ecdf4 FT |
447 | if (rq->next_rq) { |
448 | blk_rq_unmap_user(bidi_bio); | |
449 | blk_put_request(rq->next_rq); | |
450 | } | |
451 | ||
70e36ece FT |
452 | blk_rq_unmap_user(bio); |
453 | blk_put_request(rq); | |
454 | ||
455 | return ret; | |
456 | } | |
457 | ||
3d6392cf JA |
458 | static int bsg_complete_all_commands(struct bsg_device *bd) |
459 | { | |
460 | struct bsg_command *bc; | |
461 | int ret, tret; | |
462 | ||
463 | dprintk("%s: entered\n", bd->name); | |
464 | ||
465 | set_bit(BSG_F_BLOCK, &bd->flags); | |
466 | ||
467 | /* | |
468 | * wait for all commands to complete | |
469 | */ | |
470 | ret = 0; | |
471 | do { | |
25fd1643 | 472 | ret = bsg_io_schedule(bd); |
3d6392cf JA |
473 | /* |
474 | * look for -ENODATA specifically -- we'll sometimes get | |
475 | * -ERESTARTSYS when we've taken a signal, but we can't | |
476 | * return until we're done freeing the queue, so ignore | |
477 | * it. The signal will get handled when we're done freeing | |
478 | * the bsg_device. | |
479 | */ | |
480 | } while (ret != -ENODATA); | |
481 | ||
482 | /* | |
483 | * discard done commands | |
484 | */ | |
485 | ret = 0; | |
486 | do { | |
e7d72173 FT |
487 | spin_lock_irq(&bd->lock); |
488 | if (!bd->queued_cmds) { | |
489 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
490 | break; |
491 | } | |
efba1a31 | 492 | spin_unlock_irq(&bd->lock); |
3d6392cf | 493 | |
e7d72173 FT |
494 | bc = bsg_get_done_cmd(bd); |
495 | if (IS_ERR(bc)) | |
496 | break; | |
497 | ||
2c9ecdf4 FT |
498 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
499 | bc->bidi_bio); | |
3d6392cf JA |
500 | if (!ret) |
501 | ret = tret; | |
502 | ||
503 | bsg_free_command(bc); | |
504 | } while (1); | |
505 | ||
506 | return ret; | |
507 | } | |
508 | ||
25fd1643 | 509 | static int |
e7d72173 FT |
510 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
511 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
512 | { |
513 | struct bsg_command *bc; | |
514 | int nr_commands, ret; | |
515 | ||
70e36ece | 516 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
517 | return -EINVAL; |
518 | ||
519 | ret = 0; | |
70e36ece | 520 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 521 | while (nr_commands) { |
e7d72173 | 522 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
523 | if (IS_ERR(bc)) { |
524 | ret = PTR_ERR(bc); | |
525 | break; | |
526 | } | |
527 | ||
528 | /* | |
529 | * this is the only case where we need to copy data back | |
530 | * after completing the request. so do that here, | |
531 | * bsg_complete_work() cannot do that for us | |
532 | */ | |
2c9ecdf4 FT |
533 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
534 | bc->bidi_bio); | |
3d6392cf | 535 | |
25fd1643 | 536 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
537 | ret = -EFAULT; |
538 | ||
539 | bsg_free_command(bc); | |
540 | ||
541 | if (ret) | |
542 | break; | |
543 | ||
70e36ece FT |
544 | buf += sizeof(struct sg_io_v4); |
545 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
546 | nr_commands--; |
547 | } | |
548 | ||
549 | return ret; | |
550 | } | |
551 | ||
552 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
553 | { | |
554 | if (file->f_flags & O_NONBLOCK) | |
555 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
556 | else | |
557 | set_bit(BSG_F_BLOCK, &bd->flags); | |
558 | } | |
559 | ||
560 | static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) | |
561 | { | |
562 | if (file->f_mode & FMODE_WRITE) | |
563 | set_bit(BSG_F_WRITE_PERM, &bd->flags); | |
564 | else | |
565 | clear_bit(BSG_F_WRITE_PERM, &bd->flags); | |
566 | } | |
567 | ||
25fd1643 JA |
568 | /* |
569 | * Check if the error is a "real" error that we should return. | |
570 | */ | |
3d6392cf JA |
571 | static inline int err_block_err(int ret) |
572 | { | |
573 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
574 | return 1; | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | static ssize_t | |
580 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
581 | { | |
582 | struct bsg_device *bd = file->private_data; | |
583 | int ret; | |
584 | ssize_t bytes_read; | |
585 | ||
9e69fbb5 | 586 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
3d6392cf JA |
587 | |
588 | bsg_set_block(bd, file); | |
589 | bytes_read = 0; | |
e7d72173 | 590 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
591 | *ppos = bytes_read; |
592 | ||
593 | if (!bytes_read || (bytes_read && err_block_err(ret))) | |
594 | bytes_read = ret; | |
595 | ||
596 | return bytes_read; | |
597 | } | |
598 | ||
25fd1643 JA |
599 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
600 | size_t count, ssize_t *bytes_written) | |
3d6392cf JA |
601 | { |
602 | struct bsg_command *bc; | |
603 | struct request *rq; | |
604 | int ret, nr_commands; | |
605 | ||
70e36ece | 606 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
607 | return -EINVAL; |
608 | ||
70e36ece | 609 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
610 | rq = NULL; |
611 | bc = NULL; | |
612 | ret = 0; | |
613 | while (nr_commands) { | |
614 | request_queue_t *q = bd->queue; | |
3d6392cf | 615 | |
e7d72173 | 616 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
617 | if (IS_ERR(bc)) { |
618 | ret = PTR_ERR(bc); | |
619 | bc = NULL; | |
620 | break; | |
621 | } | |
622 | ||
70e36ece | 623 | bc->uhdr = (struct sg_io_v4 __user *) buf; |
3d6392cf JA |
624 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
625 | ret = -EFAULT; | |
626 | break; | |
627 | } | |
628 | ||
629 | /* | |
630 | * get a request, fill in the blanks, and add to request queue | |
631 | */ | |
70e36ece | 632 | rq = bsg_map_hdr(bd, &bc->hdr); |
3d6392cf JA |
633 | if (IS_ERR(rq)) { |
634 | ret = PTR_ERR(rq); | |
635 | rq = NULL; | |
636 | break; | |
637 | } | |
638 | ||
639 | bsg_add_command(bd, q, bc, rq); | |
640 | bc = NULL; | |
641 | rq = NULL; | |
642 | nr_commands--; | |
70e36ece | 643 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 644 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
645 | } |
646 | ||
3d6392cf JA |
647 | if (bc) |
648 | bsg_free_command(bc); | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
653 | static ssize_t | |
654 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
655 | { | |
656 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 657 | ssize_t bytes_written; |
3d6392cf JA |
658 | int ret; |
659 | ||
9e69fbb5 | 660 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
3d6392cf JA |
661 | |
662 | bsg_set_block(bd, file); | |
663 | bsg_set_write_perm(bd, file); | |
664 | ||
25fd1643 JA |
665 | bytes_written = 0; |
666 | ret = __bsg_write(bd, buf, count, &bytes_written); | |
667 | *ppos = bytes_written; | |
3d6392cf JA |
668 | |
669 | /* | |
670 | * return bytes written on non-fatal errors | |
671 | */ | |
25fd1643 JA |
672 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
673 | bytes_written = ret; | |
3d6392cf | 674 | |
25fd1643 JA |
675 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
676 | return bytes_written; | |
3d6392cf JA |
677 | } |
678 | ||
3d6392cf JA |
679 | static struct bsg_device *bsg_alloc_device(void) |
680 | { | |
3d6392cf | 681 | struct bsg_device *bd; |
3d6392cf JA |
682 | |
683 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
684 | if (unlikely(!bd)) | |
685 | return NULL; | |
686 | ||
687 | spin_lock_init(&bd->lock); | |
688 | ||
5309cb38 | 689 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
690 | |
691 | INIT_LIST_HEAD(&bd->busy_list); | |
692 | INIT_LIST_HEAD(&bd->done_list); | |
693 | INIT_HLIST_NODE(&bd->dev_list); | |
694 | ||
695 | init_waitqueue_head(&bd->wq_free); | |
696 | init_waitqueue_head(&bd->wq_done); | |
697 | return bd; | |
3d6392cf JA |
698 | } |
699 | ||
700 | static int bsg_put_device(struct bsg_device *bd) | |
701 | { | |
702 | int ret = 0; | |
703 | ||
704 | mutex_lock(&bsg_mutex); | |
705 | ||
706 | if (!atomic_dec_and_test(&bd->ref_count)) | |
707 | goto out; | |
708 | ||
709 | dprintk("%s: tearing down\n", bd->name); | |
710 | ||
711 | /* | |
712 | * close can always block | |
713 | */ | |
714 | set_bit(BSG_F_BLOCK, &bd->flags); | |
715 | ||
716 | /* | |
717 | * correct error detection baddies here again. it's the responsibility | |
718 | * of the app to properly reap commands before close() if it wants | |
719 | * fool-proof error detection | |
720 | */ | |
721 | ret = bsg_complete_all_commands(bd); | |
722 | ||
723 | blk_put_queue(bd->queue); | |
724 | hlist_del(&bd->dev_list); | |
5309cb38 | 725 | kfree(bd); |
3d6392cf JA |
726 | out: |
727 | mutex_unlock(&bsg_mutex); | |
728 | return ret; | |
729 | } | |
730 | ||
731 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 732 | struct request_queue *rq, |
3d6392cf JA |
733 | struct file *file) |
734 | { | |
25fd1643 | 735 | struct bsg_device *bd; |
3d6392cf JA |
736 | #ifdef BSG_DEBUG |
737 | unsigned char buf[32]; | |
738 | #endif | |
739 | ||
740 | bd = bsg_alloc_device(); | |
741 | if (!bd) | |
742 | return ERR_PTR(-ENOMEM); | |
743 | ||
d351af01 FT |
744 | bd->queue = rq; |
745 | kobject_get(&rq->kobj); | |
3d6392cf JA |
746 | bsg_set_block(bd, file); |
747 | ||
748 | atomic_set(&bd->ref_count, 1); | |
749 | bd->minor = iminor(inode); | |
750 | mutex_lock(&bsg_mutex); | |
1c1133e1 | 751 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(bd->minor)); |
3d6392cf | 752 | |
d351af01 | 753 | strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1); |
3d6392cf | 754 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 755 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
756 | |
757 | mutex_unlock(&bsg_mutex); | |
758 | return bd; | |
759 | } | |
760 | ||
761 | static struct bsg_device *__bsg_get_device(int minor) | |
762 | { | |
3d6392cf JA |
763 | struct bsg_device *bd = NULL; |
764 | struct hlist_node *entry; | |
765 | ||
766 | mutex_lock(&bsg_mutex); | |
767 | ||
1c1133e1 | 768 | hlist_for_each(entry, bsg_dev_idx_hash(minor)) { |
3d6392cf JA |
769 | bd = hlist_entry(entry, struct bsg_device, dev_list); |
770 | if (bd->minor == minor) { | |
771 | atomic_inc(&bd->ref_count); | |
772 | break; | |
773 | } | |
774 | ||
775 | bd = NULL; | |
776 | } | |
777 | ||
778 | mutex_unlock(&bsg_mutex); | |
779 | return bd; | |
780 | } | |
781 | ||
782 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
783 | { | |
784 | struct bsg_device *bd = __bsg_get_device(iminor(inode)); | |
785 | struct bsg_class_device *bcd, *__bcd; | |
786 | ||
787 | if (bd) | |
788 | return bd; | |
789 | ||
790 | /* | |
791 | * find the class device | |
792 | */ | |
793 | bcd = NULL; | |
794 | mutex_lock(&bsg_mutex); | |
795 | list_for_each_entry(__bcd, &bsg_class_list, list) { | |
796 | if (__bcd->minor == iminor(inode)) { | |
797 | bcd = __bcd; | |
798 | break; | |
799 | } | |
800 | } | |
801 | mutex_unlock(&bsg_mutex); | |
802 | ||
803 | if (!bcd) | |
804 | return ERR_PTR(-ENODEV); | |
805 | ||
d351af01 | 806 | return bsg_add_device(inode, bcd->queue, file); |
3d6392cf JA |
807 | } |
808 | ||
809 | static int bsg_open(struct inode *inode, struct file *file) | |
810 | { | |
811 | struct bsg_device *bd = bsg_get_device(inode, file); | |
812 | ||
813 | if (IS_ERR(bd)) | |
814 | return PTR_ERR(bd); | |
815 | ||
816 | file->private_data = bd; | |
817 | return 0; | |
818 | } | |
819 | ||
820 | static int bsg_release(struct inode *inode, struct file *file) | |
821 | { | |
822 | struct bsg_device *bd = file->private_data; | |
823 | ||
824 | file->private_data = NULL; | |
825 | return bsg_put_device(bd); | |
826 | } | |
827 | ||
828 | static unsigned int bsg_poll(struct file *file, poll_table *wait) | |
829 | { | |
830 | struct bsg_device *bd = file->private_data; | |
831 | unsigned int mask = 0; | |
832 | ||
833 | poll_wait(file, &bd->wq_done, wait); | |
834 | poll_wait(file, &bd->wq_free, wait); | |
835 | ||
836 | spin_lock_irq(&bd->lock); | |
837 | if (!list_empty(&bd->done_list)) | |
838 | mask |= POLLIN | POLLRDNORM; | |
839 | if (bd->queued_cmds >= bd->max_queue) | |
840 | mask |= POLLOUT; | |
841 | spin_unlock_irq(&bd->lock); | |
842 | ||
843 | return mask; | |
844 | } | |
845 | ||
25fd1643 | 846 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
847 | { |
848 | struct bsg_device *bd = file->private_data; | |
849 | int __user *uarg = (int __user *) arg; | |
850 | ||
3d6392cf JA |
851 | switch (cmd) { |
852 | /* | |
853 | * our own ioctls | |
854 | */ | |
855 | case SG_GET_COMMAND_Q: | |
856 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 857 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
858 | int queue; |
859 | ||
860 | if (get_user(queue, uarg)) | |
861 | return -EFAULT; | |
5309cb38 | 862 | if (queue < 1) |
3d6392cf JA |
863 | return -EINVAL; |
864 | ||
5309cb38 | 865 | spin_lock_irq(&bd->lock); |
3d6392cf | 866 | bd->max_queue = queue; |
5309cb38 | 867 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
868 | return 0; |
869 | } | |
870 | ||
871 | /* | |
872 | * SCSI/sg ioctls | |
873 | */ | |
874 | case SG_GET_VERSION_NUM: | |
875 | case SCSI_IOCTL_GET_IDLUN: | |
876 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
877 | case SG_SET_TIMEOUT: | |
878 | case SG_GET_TIMEOUT: | |
879 | case SG_GET_RESERVED_SIZE: | |
880 | case SG_SET_RESERVED_SIZE: | |
881 | case SG_EMULATED_HOST: | |
3d6392cf JA |
882 | case SCSI_IOCTL_SEND_COMMAND: { |
883 | void __user *uarg = (void __user *) arg; | |
d351af01 | 884 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
3d6392cf | 885 | } |
10e8855b FT |
886 | case SG_IO: { |
887 | struct request *rq; | |
2c9ecdf4 | 888 | struct bio *bio, *bidi_bio = NULL; |
10e8855b FT |
889 | struct sg_io_v4 hdr; |
890 | ||
891 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
892 | return -EFAULT; | |
893 | ||
894 | rq = bsg_map_hdr(bd, &hdr); | |
895 | if (IS_ERR(rq)) | |
896 | return PTR_ERR(rq); | |
897 | ||
898 | bio = rq->bio; | |
2c9ecdf4 FT |
899 | if (rq->next_rq) |
900 | bidi_bio = rq->next_rq->bio; | |
d351af01 | 901 | blk_execute_rq(bd->queue, NULL, rq, 0); |
2c9ecdf4 | 902 | blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
903 | |
904 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
905 | return -EFAULT; | |
b711afa6 JA |
906 | |
907 | return 0; | |
10e8855b | 908 | } |
3d6392cf JA |
909 | /* |
910 | * block device ioctls | |
911 | */ | |
912 | default: | |
913 | #if 0 | |
914 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
915 | #else | |
916 | return -ENOTTY; | |
917 | #endif | |
918 | } | |
919 | } | |
920 | ||
921 | static struct file_operations bsg_fops = { | |
922 | .read = bsg_read, | |
923 | .write = bsg_write, | |
924 | .poll = bsg_poll, | |
925 | .open = bsg_open, | |
926 | .release = bsg_release, | |
25fd1643 | 927 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf JA |
928 | .owner = THIS_MODULE, |
929 | }; | |
930 | ||
d351af01 | 931 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 932 | { |
d351af01 | 933 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 934 | |
25fd1643 | 935 | WARN_ON(!bcd->class_dev); |
3d6392cf JA |
936 | |
937 | mutex_lock(&bsg_mutex); | |
d351af01 | 938 | sysfs_remove_link(&q->kobj, "bsg"); |
46f6ef4a | 939 | class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor)); |
3d6392cf JA |
940 | bcd->class_dev = NULL; |
941 | list_del_init(&bcd->list); | |
292b7f27 | 942 | bsg_device_nr--; |
3d6392cf JA |
943 | mutex_unlock(&bsg_mutex); |
944 | } | |
4cf0723a | 945 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 946 | |
4cf0723a | 947 | int bsg_register_queue(struct request_queue *q, const char *name) |
3d6392cf | 948 | { |
292b7f27 | 949 | struct bsg_class_device *bcd, *__bcd; |
3d6392cf | 950 | dev_t dev; |
292b7f27 | 951 | int ret = -EMFILE; |
4e2872d6 | 952 | struct class_device *class_dev = NULL; |
3d6392cf JA |
953 | |
954 | /* | |
955 | * we need a proper transport to send commands, not a stacked device | |
956 | */ | |
957 | if (!q->request_fn) | |
958 | return 0; | |
959 | ||
d351af01 | 960 | bcd = &q->bsg_dev; |
3d6392cf JA |
961 | memset(bcd, 0, sizeof(*bcd)); |
962 | INIT_LIST_HEAD(&bcd->list); | |
963 | ||
964 | mutex_lock(&bsg_mutex); | |
292b7f27 FT |
965 | if (bsg_device_nr == BSG_MAX_DEVS) { |
966 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
967 | goto err; | |
968 | } | |
969 | ||
970 | retry: | |
971 | list_for_each_entry(__bcd, &bsg_class_list, list) { | |
972 | if (__bcd->minor == bsg_minor_idx) { | |
973 | bsg_minor_idx++; | |
974 | if (bsg_minor_idx == BSG_MAX_DEVS) | |
975 | bsg_minor_idx = 0; | |
976 | goto retry; | |
977 | } | |
978 | } | |
979 | ||
980 | bcd->minor = bsg_minor_idx++; | |
981 | if (bsg_minor_idx == BSG_MAX_DEVS) | |
982 | bsg_minor_idx = 0; | |
983 | ||
d351af01 | 984 | bcd->queue = q; |
46f6ef4a | 985 | dev = MKDEV(bsg_major, bcd->minor); |
4e2872d6 FT |
986 | class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name); |
987 | if (IS_ERR(class_dev)) { | |
988 | ret = PTR_ERR(class_dev); | |
264a0472 | 989 | goto err; |
4e2872d6 FT |
990 | } |
991 | bcd->class_dev = class_dev; | |
992 | ||
abce891a | 993 | if (q->kobj.sd) { |
4e2872d6 FT |
994 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
995 | if (ret) | |
996 | goto err; | |
997 | } | |
998 | ||
3d6392cf | 999 | list_add_tail(&bcd->list, &bsg_class_list); |
292b7f27 | 1000 | bsg_device_nr++; |
4e2872d6 | 1001 | |
3d6392cf JA |
1002 | mutex_unlock(&bsg_mutex); |
1003 | return 0; | |
264a0472 | 1004 | err: |
4e2872d6 | 1005 | if (class_dev) |
46f6ef4a | 1006 | class_device_destroy(bsg_class, MKDEV(bsg_major, bcd->minor)); |
264a0472 | 1007 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
1008 | return ret; |
1009 | } | |
4cf0723a | 1010 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 FT |
1011 | |
1012 | static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf) | |
1013 | { | |
1014 | int ret; | |
1015 | struct scsi_device *sdp = to_scsi_device(cl_dev->dev); | |
1016 | struct request_queue *rq = sdp->request_queue; | |
1017 | ||
1018 | if (rq->kobj.parent) | |
1019 | ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent)); | |
1020 | else | |
1021 | ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj)); | |
1022 | return ret; | |
3d6392cf JA |
1023 | } |
1024 | ||
4e2872d6 FT |
1025 | static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
1026 | { | |
1027 | bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue); | |
1028 | } | |
1029 | ||
1030 | static struct class_interface bsg_intf = { | |
1031 | .add = bsg_add, | |
1032 | .remove = bsg_remove, | |
1033 | }; | |
1034 | ||
292b7f27 FT |
1035 | static struct cdev bsg_cdev = { |
1036 | .kobj = {.name = "bsg", }, | |
1037 | .owner = THIS_MODULE, | |
1038 | }; | |
1039 | ||
3d6392cf JA |
1040 | static int __init bsg_init(void) |
1041 | { | |
1042 | int ret, i; | |
46f6ef4a | 1043 | dev_t devid; |
3d6392cf | 1044 | |
5309cb38 | 1045 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83 | 1046 | sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38 JA |
1047 | if (!bsg_cmd_cachep) { |
1048 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1049 | return -ENOMEM; | |
1050 | } | |
1051 | ||
25fd1643 | 1052 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1053 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1054 | ||
1055 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 | 1056 | if (IS_ERR(bsg_class)) { |
9b9f770c FT |
1057 | ret = PTR_ERR(bsg_class); |
1058 | goto destroy_kmemcache; | |
5309cb38 | 1059 | } |
3d6392cf | 1060 | |
46f6ef4a | 1061 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
1062 | if (ret) |
1063 | goto destroy_bsg_class; | |
292b7f27 | 1064 | |
46f6ef4a JA |
1065 | bsg_major = MAJOR(devid); |
1066 | ||
292b7f27 | 1067 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 1068 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
1069 | if (ret) |
1070 | goto unregister_chrdev; | |
3d6392cf | 1071 | |
4e2872d6 | 1072 | ret = scsi_register_interface(&bsg_intf); |
9b9f770c FT |
1073 | if (ret) |
1074 | goto remove_cdev; | |
4e2872d6 | 1075 | |
5d3a8cd3 | 1076 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 1077 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 1078 | return 0; |
9b9f770c FT |
1079 | remove_cdev: |
1080 | printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret); | |
1081 | cdev_del(&bsg_cdev); | |
1082 | unregister_chrdev: | |
1083 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
1084 | destroy_bsg_class: | |
1085 | class_destroy(bsg_class); | |
1086 | destroy_kmemcache: | |
1087 | kmem_cache_destroy(bsg_cmd_cachep); | |
1088 | return ret; | |
3d6392cf JA |
1089 | } |
1090 | ||
1091 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 1092 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
1093 | MODULE_LICENSE("GPL"); |
1094 | ||
4e2872d6 | 1095 | device_initcall(bsg_init); |