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