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Commit | Line | Data |
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3d6392cf | 1 | /* |
0c6a89ba | 2 | * bsg.c - block layer implementation of the sg v4 interface |
3d6392cf JA |
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 | */ | |
3d6392cf JA |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/cdev.h> | |
18 | #include <linux/percpu.h> | |
19 | #include <linux/uio.h> | |
598443a2 | 20 | #include <linux/idr.h> |
3d6392cf JA |
21 | #include <linux/bsg.h> |
22 | ||
23 | #include <scsi/scsi.h> | |
24 | #include <scsi/scsi_ioctl.h> | |
25 | #include <scsi/scsi_cmnd.h> | |
4e2872d6 FT |
26 | #include <scsi/scsi_device.h> |
27 | #include <scsi/scsi_driver.h> | |
3d6392cf JA |
28 | #include <scsi/sg.h> |
29 | ||
0ed081ce FT |
30 | #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" |
31 | #define BSG_VERSION "0.4" | |
3d6392cf | 32 | |
3d6392cf | 33 | struct bsg_device { |
165125e1 | 34 | struct request_queue *queue; |
3d6392cf JA |
35 | spinlock_t lock; |
36 | struct list_head busy_list; | |
37 | struct list_head done_list; | |
38 | struct hlist_node dev_list; | |
39 | atomic_t ref_count; | |
3d6392cf JA |
40 | int queued_cmds; |
41 | int done_cmds; | |
3d6392cf JA |
42 | wait_queue_head_t wq_done; |
43 | wait_queue_head_t wq_free; | |
d351af01 | 44 | char name[BUS_ID_SIZE]; |
3d6392cf JA |
45 | int max_queue; |
46 | unsigned long flags; | |
47 | }; | |
48 | ||
49 | enum { | |
50 | BSG_F_BLOCK = 1, | |
51 | BSG_F_WRITE_PERM = 2, | |
52 | }; | |
53 | ||
5309cb38 | 54 | #define BSG_DEFAULT_CMDS 64 |
292b7f27 | 55 | #define BSG_MAX_DEVS 32768 |
3d6392cf JA |
56 | |
57 | #undef BSG_DEBUG | |
58 | ||
59 | #ifdef BSG_DEBUG | |
60 | #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ##args) | |
61 | #else | |
62 | #define dprintk(fmt, args...) | |
63 | #endif | |
64 | ||
3d6392cf | 65 | static DEFINE_MUTEX(bsg_mutex); |
598443a2 | 66 | static DEFINE_IDR(bsg_minor_idr); |
3d6392cf | 67 | |
25fd1643 | 68 | #define BSG_LIST_ARRAY_SIZE 8 |
25fd1643 | 69 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
3d6392cf JA |
70 | |
71 | static struct class *bsg_class; | |
46f6ef4a | 72 | static int bsg_major; |
3d6392cf | 73 | |
5309cb38 JA |
74 | static struct kmem_cache *bsg_cmd_cachep; |
75 | ||
3d6392cf JA |
76 | /* |
77 | * our internal command type | |
78 | */ | |
79 | struct bsg_command { | |
80 | struct bsg_device *bd; | |
81 | struct list_head list; | |
82 | struct request *rq; | |
83 | struct bio *bio; | |
2c9ecdf4 | 84 | struct bio *bidi_bio; |
3d6392cf | 85 | int err; |
70e36ece | 86 | struct sg_io_v4 hdr; |
3d6392cf JA |
87 | char sense[SCSI_SENSE_BUFFERSIZE]; |
88 | }; | |
89 | ||
90 | static void bsg_free_command(struct bsg_command *bc) | |
91 | { | |
92 | struct bsg_device *bd = bc->bd; | |
3d6392cf JA |
93 | unsigned long flags; |
94 | ||
5309cb38 | 95 | kmem_cache_free(bsg_cmd_cachep, bc); |
3d6392cf JA |
96 | |
97 | spin_lock_irqsave(&bd->lock, flags); | |
98 | bd->queued_cmds--; | |
3d6392cf JA |
99 | spin_unlock_irqrestore(&bd->lock, flags); |
100 | ||
101 | wake_up(&bd->wq_free); | |
102 | } | |
103 | ||
e7d72173 | 104 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
3d6392cf | 105 | { |
e7d72173 | 106 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
3d6392cf JA |
107 | |
108 | spin_lock_irq(&bd->lock); | |
109 | ||
110 | if (bd->queued_cmds >= bd->max_queue) | |
111 | goto out; | |
112 | ||
3d6392cf | 113 | bd->queued_cmds++; |
3d6392cf JA |
114 | spin_unlock_irq(&bd->lock); |
115 | ||
25fd1643 | 116 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
5309cb38 JA |
117 | if (unlikely(!bc)) { |
118 | spin_lock_irq(&bd->lock); | |
7e75d730 | 119 | bd->queued_cmds--; |
e7d72173 | 120 | bc = ERR_PTR(-ENOMEM); |
7e75d730 | 121 | goto out; |
5309cb38 JA |
122 | } |
123 | ||
3d6392cf JA |
124 | bc->bd = bd; |
125 | INIT_LIST_HEAD(&bc->list); | |
5309cb38 | 126 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
3d6392cf JA |
127 | return bc; |
128 | out: | |
3d6392cf JA |
129 | spin_unlock_irq(&bd->lock); |
130 | return bc; | |
131 | } | |
132 | ||
1c1133e1 | 133 | static inline struct hlist_head *bsg_dev_idx_hash(int index) |
3d6392cf | 134 | { |
1c1133e1 | 135 | return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cf JA |
136 | } |
137 | ||
25fd1643 | 138 | static int bsg_io_schedule(struct bsg_device *bd) |
3d6392cf JA |
139 | { |
140 | DEFINE_WAIT(wait); | |
141 | int ret = 0; | |
142 | ||
143 | spin_lock_irq(&bd->lock); | |
144 | ||
145 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
146 | ||
147 | /* | |
148 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no | |
149 | * work to do", even though we return -ENOSPC after this same test | |
150 | * during bsg_write() -- there, it means our buffer can't have more | |
151 | * bsg_commands added to it, thus has no space left. | |
152 | */ | |
153 | if (bd->done_cmds == bd->queued_cmds) { | |
154 | ret = -ENODATA; | |
155 | goto unlock; | |
156 | } | |
157 | ||
158 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { | |
159 | ret = -EAGAIN; | |
160 | goto unlock; | |
161 | } | |
162 | ||
25fd1643 | 163 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
3d6392cf JA |
164 | spin_unlock_irq(&bd->lock); |
165 | io_schedule(); | |
166 | finish_wait(&bd->wq_done, &wait); | |
167 | ||
3d6392cf JA |
168 | return ret; |
169 | unlock: | |
170 | spin_unlock_irq(&bd->lock); | |
171 | return ret; | |
172 | } | |
173 | ||
165125e1 | 174 | static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
70e36ece FT |
175 | struct sg_io_v4 *hdr, int has_write_perm) |
176 | { | |
177 | memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ | |
178 | ||
179 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, | |
180 | hdr->request_len)) | |
181 | return -EFAULT; | |
15d10b61 FT |
182 | |
183 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { | |
184 | if (blk_verify_command(rq->cmd, has_write_perm)) | |
185 | return -EPERM; | |
186 | } else if (!capable(CAP_SYS_RAWIO)) | |
70e36ece FT |
187 | return -EPERM; |
188 | ||
189 | /* | |
190 | * fill in request structure | |
191 | */ | |
192 | rq->cmd_len = hdr->request_len; | |
193 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
194 | ||
195 | rq->timeout = (hdr->timeout * HZ) / 1000; | |
196 | if (!rq->timeout) | |
197 | rq->timeout = q->sg_timeout; | |
198 | if (!rq->timeout) | |
199 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
3d6392cf | 204 | /* |
70e36ece | 205 | * Check if sg_io_v4 from user is allowed and valid |
3d6392cf JA |
206 | */ |
207 | static int | |
165125e1 | 208 | bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) |
3d6392cf | 209 | { |
15d10b61 FT |
210 | int ret = 0; |
211 | ||
70e36ece | 212 | if (hdr->guard != 'Q') |
3d6392cf | 213 | return -EINVAL; |
70e36ece | 214 | if (hdr->request_len > BLK_MAX_CDB) |
3d6392cf | 215 | return -EINVAL; |
70e36ece FT |
216 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
217 | hdr->din_xfer_len > (q->max_sectors << 9)) | |
3d6392cf JA |
218 | return -EIO; |
219 | ||
15d10b61 FT |
220 | switch (hdr->protocol) { |
221 | case BSG_PROTOCOL_SCSI: | |
222 | switch (hdr->subprotocol) { | |
223 | case BSG_SUB_PROTOCOL_SCSI_CMD: | |
224 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: | |
225 | break; | |
226 | default: | |
227 | ret = -EINVAL; | |
228 | } | |
229 | break; | |
230 | default: | |
231 | ret = -EINVAL; | |
232 | } | |
70e36ece | 233 | |
70e36ece | 234 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
15d10b61 | 235 | return ret; |
3d6392cf JA |
236 | } |
237 | ||
238 | /* | |
70e36ece | 239 | * map sg_io_v4 to a request. |
3d6392cf JA |
240 | */ |
241 | static struct request * | |
70e36ece | 242 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
3d6392cf | 243 | { |
165125e1 | 244 | struct request_queue *q = bd->queue; |
2c9ecdf4 | 245 | struct request *rq, *next_rq = NULL; |
25fd1643 | 246 | int ret, rw; |
70e36ece FT |
247 | unsigned int dxfer_len; |
248 | void *dxferp = NULL; | |
3d6392cf | 249 | |
70e36ece FT |
250 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
251 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, | |
252 | hdr->din_xfer_len); | |
3d6392cf | 253 | |
70e36ece | 254 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
3d6392cf JA |
255 | if (ret) |
256 | return ERR_PTR(ret); | |
257 | ||
258 | /* | |
259 | * map scatter-gather elements seperately and string them to request | |
260 | */ | |
261 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
2c9ecdf4 FT |
262 | if (!rq) |
263 | return ERR_PTR(-ENOMEM); | |
70e36ece FT |
264 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, |
265 | &bd->flags)); | |
2c9ecdf4 FT |
266 | if (ret) |
267 | goto out; | |
268 | ||
269 | if (rw == WRITE && hdr->din_xfer_len) { | |
270 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { | |
271 | ret = -EOPNOTSUPP; | |
272 | goto out; | |
273 | } | |
274 | ||
275 | next_rq = blk_get_request(q, READ, GFP_KERNEL); | |
276 | if (!next_rq) { | |
277 | ret = -ENOMEM; | |
278 | goto out; | |
279 | } | |
280 | rq->next_rq = next_rq; | |
40f62028 | 281 | next_rq->cmd_type = rq->cmd_type; |
2c9ecdf4 FT |
282 | |
283 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
284 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); | |
285 | if (ret) | |
286 | goto out; | |
3d6392cf JA |
287 | } |
288 | ||
70e36ece FT |
289 | if (hdr->dout_xfer_len) { |
290 | dxfer_len = hdr->dout_xfer_len; | |
291 | dxferp = (void*)(unsigned long)hdr->dout_xferp; | |
292 | } else if (hdr->din_xfer_len) { | |
293 | dxfer_len = hdr->din_xfer_len; | |
294 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
295 | } else | |
296 | dxfer_len = 0; | |
297 | ||
298 | if (dxfer_len) { | |
299 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); | |
2c9ecdf4 FT |
300 | if (ret) |
301 | goto out; | |
3d6392cf | 302 | } |
3d6392cf | 303 | return rq; |
2c9ecdf4 FT |
304 | out: |
305 | blk_put_request(rq); | |
306 | if (next_rq) { | |
307 | blk_rq_unmap_user(next_rq->bio); | |
308 | blk_put_request(next_rq); | |
309 | } | |
310 | return ERR_PTR(ret); | |
3d6392cf JA |
311 | } |
312 | ||
313 | /* | |
314 | * async completion call-back from the block layer, when scsi/ide/whatever | |
315 | * calls end_that_request_last() on a request | |
316 | */ | |
317 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
318 | { | |
319 | struct bsg_command *bc = rq->end_io_data; | |
320 | struct bsg_device *bd = bc->bd; | |
321 | unsigned long flags; | |
322 | ||
5309cb38 JA |
323 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
324 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
325 | |
326 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
327 | ||
328 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
329 | list_move_tail(&bc->list, &bd->done_list); |
330 | bd->done_cmds++; | |
3d6392cf | 331 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
332 | |
333 | wake_up(&bd->wq_done); | |
3d6392cf JA |
334 | } |
335 | ||
336 | /* | |
337 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
338 | * layer for io | |
339 | */ | |
165125e1 | 340 | static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
3d6392cf JA |
341 | struct bsg_command *bc, struct request *rq) |
342 | { | |
343 | rq->sense = bc->sense; | |
344 | rq->sense_len = 0; | |
345 | ||
346 | /* | |
347 | * add bc command to busy queue and submit rq for io | |
348 | */ | |
349 | bc->rq = rq; | |
350 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
351 | if (rq->next_rq) |
352 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
353 | bc->hdr.duration = jiffies; |
354 | spin_lock_irq(&bd->lock); | |
355 | list_add_tail(&bc->list, &bd->busy_list); | |
356 | spin_unlock_irq(&bd->lock); | |
357 | ||
358 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
359 | ||
360 | rq->end_io_data = bc; | |
d351af01 | 361 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
3d6392cf JA |
362 | } |
363 | ||
25fd1643 | 364 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
365 | { |
366 | struct bsg_command *bc = NULL; | |
367 | ||
368 | spin_lock_irq(&bd->lock); | |
369 | if (bd->done_cmds) { | |
43ac9e62 | 370 | bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
25fd1643 JA |
371 | list_del(&bc->list); |
372 | bd->done_cmds--; | |
3d6392cf JA |
373 | } |
374 | spin_unlock_irq(&bd->lock); | |
375 | ||
376 | return bc; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Get a finished command from the done list | |
381 | */ | |
e7d72173 | 382 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
383 | { |
384 | struct bsg_command *bc; | |
385 | int ret; | |
386 | ||
387 | do { | |
388 | bc = bsg_next_done_cmd(bd); | |
389 | if (bc) | |
390 | break; | |
391 | ||
e7d72173 FT |
392 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
393 | bc = ERR_PTR(-EAGAIN); | |
394 | break; | |
395 | } | |
396 | ||
397 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 398 | if (ret) { |
e7d72173 | 399 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
400 | break; |
401 | } | |
402 | } while (1); | |
403 | ||
404 | dprintk("%s: returning done %p\n", bd->name, bc); | |
405 | ||
406 | return bc; | |
407 | } | |
408 | ||
70e36ece | 409 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 410 | struct bio *bio, struct bio *bidi_bio) |
70e36ece FT |
411 | { |
412 | int ret = 0; | |
413 | ||
414 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); | |
415 | /* | |
416 | * fill in all the output members | |
417 | */ | |
418 | hdr->device_status = status_byte(rq->errors); | |
419 | hdr->transport_status = host_byte(rq->errors); | |
420 | hdr->driver_status = driver_byte(rq->errors); | |
421 | hdr->info = 0; | |
422 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
423 | hdr->info |= SG_INFO_CHECK; | |
70e36ece FT |
424 | hdr->response_len = 0; |
425 | ||
426 | if (rq->sense_len && hdr->response) { | |
25fd1643 JA |
427 | int len = min_t(unsigned int, hdr->max_response_len, |
428 | rq->sense_len); | |
70e36ece FT |
429 | |
430 | ret = copy_to_user((void*)(unsigned long)hdr->response, | |
431 | rq->sense, len); | |
432 | if (!ret) | |
433 | hdr->response_len = len; | |
434 | else | |
435 | ret = -EFAULT; | |
436 | } | |
437 | ||
2c9ecdf4 | 438 | if (rq->next_rq) { |
7a85f889 FT |
439 | hdr->dout_resid = rq->data_len; |
440 | hdr->din_resid = rq->next_rq->data_len; | |
2c9ecdf4 FT |
441 | blk_rq_unmap_user(bidi_bio); |
442 | blk_put_request(rq->next_rq); | |
0c6a89ba | 443 | } else if (rq_data_dir(rq) == READ) |
7a85f889 | 444 | hdr->din_resid = rq->data_len; |
0c6a89ba | 445 | else |
7a85f889 | 446 | hdr->dout_resid = rq->data_len; |
2c9ecdf4 | 447 | |
2d507a01 JB |
448 | /* |
449 | * If the request generated a negative error number, return it | |
450 | * (providing we aren't already returning an error); if it's | |
451 | * just a protocol response (i.e. non negative), that gets | |
452 | * processed above. | |
453 | */ | |
454 | if (!ret && rq->errors < 0) | |
455 | ret = rq->errors; | |
456 | ||
70e36ece FT |
457 | blk_rq_unmap_user(bio); |
458 | blk_put_request(rq); | |
459 | ||
460 | return ret; | |
461 | } | |
462 | ||
3d6392cf JA |
463 | static int bsg_complete_all_commands(struct bsg_device *bd) |
464 | { | |
465 | struct bsg_command *bc; | |
466 | int ret, tret; | |
467 | ||
468 | dprintk("%s: entered\n", bd->name); | |
469 | ||
3d6392cf JA |
470 | /* |
471 | * wait for all commands to complete | |
472 | */ | |
473 | ret = 0; | |
474 | do { | |
25fd1643 | 475 | ret = bsg_io_schedule(bd); |
3d6392cf JA |
476 | /* |
477 | * look for -ENODATA specifically -- we'll sometimes get | |
478 | * -ERESTARTSYS when we've taken a signal, but we can't | |
479 | * return until we're done freeing the queue, so ignore | |
480 | * it. The signal will get handled when we're done freeing | |
481 | * the bsg_device. | |
482 | */ | |
483 | } while (ret != -ENODATA); | |
484 | ||
485 | /* | |
486 | * discard done commands | |
487 | */ | |
488 | ret = 0; | |
489 | do { | |
e7d72173 FT |
490 | spin_lock_irq(&bd->lock); |
491 | if (!bd->queued_cmds) { | |
492 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
493 | break; |
494 | } | |
efba1a31 | 495 | spin_unlock_irq(&bd->lock); |
3d6392cf | 496 | |
e7d72173 FT |
497 | bc = bsg_get_done_cmd(bd); |
498 | if (IS_ERR(bc)) | |
499 | break; | |
500 | ||
2c9ecdf4 FT |
501 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
502 | bc->bidi_bio); | |
3d6392cf JA |
503 | if (!ret) |
504 | ret = tret; | |
505 | ||
506 | bsg_free_command(bc); | |
507 | } while (1); | |
508 | ||
509 | return ret; | |
510 | } | |
511 | ||
25fd1643 | 512 | static int |
e7d72173 FT |
513 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
514 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
515 | { |
516 | struct bsg_command *bc; | |
517 | int nr_commands, ret; | |
518 | ||
70e36ece | 519 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
520 | return -EINVAL; |
521 | ||
522 | ret = 0; | |
70e36ece | 523 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 524 | while (nr_commands) { |
e7d72173 | 525 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
526 | if (IS_ERR(bc)) { |
527 | ret = PTR_ERR(bc); | |
528 | break; | |
529 | } | |
530 | ||
531 | /* | |
532 | * this is the only case where we need to copy data back | |
533 | * after completing the request. so do that here, | |
534 | * bsg_complete_work() cannot do that for us | |
535 | */ | |
2c9ecdf4 FT |
536 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
537 | bc->bidi_bio); | |
3d6392cf | 538 | |
25fd1643 | 539 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
540 | ret = -EFAULT; |
541 | ||
542 | bsg_free_command(bc); | |
543 | ||
544 | if (ret) | |
545 | break; | |
546 | ||
70e36ece FT |
547 | buf += sizeof(struct sg_io_v4); |
548 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
549 | nr_commands--; |
550 | } | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
555 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
556 | { | |
557 | if (file->f_flags & O_NONBLOCK) | |
558 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
559 | else | |
560 | set_bit(BSG_F_BLOCK, &bd->flags); | |
561 | } | |
562 | ||
563 | static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) | |
564 | { | |
565 | if (file->f_mode & FMODE_WRITE) | |
566 | set_bit(BSG_F_WRITE_PERM, &bd->flags); | |
567 | else | |
568 | clear_bit(BSG_F_WRITE_PERM, &bd->flags); | |
569 | } | |
570 | ||
25fd1643 JA |
571 | /* |
572 | * Check if the error is a "real" error that we should return. | |
573 | */ | |
3d6392cf JA |
574 | static inline int err_block_err(int ret) |
575 | { | |
576 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
577 | return 1; | |
578 | ||
579 | return 0; | |
580 | } | |
581 | ||
582 | static ssize_t | |
583 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
584 | { | |
585 | struct bsg_device *bd = file->private_data; | |
586 | int ret; | |
587 | ssize_t bytes_read; | |
588 | ||
9e69fbb5 | 589 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
3d6392cf JA |
590 | |
591 | bsg_set_block(bd, file); | |
592 | bytes_read = 0; | |
e7d72173 | 593 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
594 | *ppos = bytes_read; |
595 | ||
596 | if (!bytes_read || (bytes_read && err_block_err(ret))) | |
597 | bytes_read = ret; | |
598 | ||
599 | return bytes_read; | |
600 | } | |
601 | ||
25fd1643 JA |
602 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
603 | size_t count, ssize_t *bytes_written) | |
3d6392cf JA |
604 | { |
605 | struct bsg_command *bc; | |
606 | struct request *rq; | |
607 | int ret, nr_commands; | |
608 | ||
70e36ece | 609 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
610 | return -EINVAL; |
611 | ||
70e36ece | 612 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
613 | rq = NULL; |
614 | bc = NULL; | |
615 | ret = 0; | |
616 | while (nr_commands) { | |
165125e1 | 617 | struct request_queue *q = bd->queue; |
3d6392cf | 618 | |
e7d72173 | 619 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
620 | if (IS_ERR(bc)) { |
621 | ret = PTR_ERR(bc); | |
622 | bc = NULL; | |
623 | break; | |
624 | } | |
625 | ||
3d6392cf JA |
626 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
627 | ret = -EFAULT; | |
628 | break; | |
629 | } | |
630 | ||
631 | /* | |
632 | * get a request, fill in the blanks, and add to request queue | |
633 | */ | |
70e36ece | 634 | rq = bsg_map_hdr(bd, &bc->hdr); |
3d6392cf JA |
635 | if (IS_ERR(rq)) { |
636 | ret = PTR_ERR(rq); | |
637 | rq = NULL; | |
638 | break; | |
639 | } | |
640 | ||
641 | bsg_add_command(bd, q, bc, rq); | |
642 | bc = NULL; | |
643 | rq = NULL; | |
644 | nr_commands--; | |
70e36ece | 645 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 646 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
647 | } |
648 | ||
3d6392cf JA |
649 | if (bc) |
650 | bsg_free_command(bc); | |
651 | ||
652 | return ret; | |
653 | } | |
654 | ||
655 | static ssize_t | |
656 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
657 | { | |
658 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 659 | ssize_t bytes_written; |
3d6392cf JA |
660 | int ret; |
661 | ||
9e69fbb5 | 662 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
3d6392cf JA |
663 | |
664 | bsg_set_block(bd, file); | |
665 | bsg_set_write_perm(bd, file); | |
666 | ||
25fd1643 JA |
667 | bytes_written = 0; |
668 | ret = __bsg_write(bd, buf, count, &bytes_written); | |
669 | *ppos = bytes_written; | |
3d6392cf JA |
670 | |
671 | /* | |
672 | * return bytes written on non-fatal errors | |
673 | */ | |
25fd1643 JA |
674 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
675 | bytes_written = ret; | |
3d6392cf | 676 | |
25fd1643 JA |
677 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
678 | return bytes_written; | |
3d6392cf JA |
679 | } |
680 | ||
3d6392cf JA |
681 | static struct bsg_device *bsg_alloc_device(void) |
682 | { | |
3d6392cf | 683 | struct bsg_device *bd; |
3d6392cf JA |
684 | |
685 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
686 | if (unlikely(!bd)) | |
687 | return NULL; | |
688 | ||
689 | spin_lock_init(&bd->lock); | |
690 | ||
5309cb38 | 691 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
692 | |
693 | INIT_LIST_HEAD(&bd->busy_list); | |
694 | INIT_LIST_HEAD(&bd->done_list); | |
695 | INIT_HLIST_NODE(&bd->dev_list); | |
696 | ||
697 | init_waitqueue_head(&bd->wq_free); | |
698 | init_waitqueue_head(&bd->wq_done); | |
699 | return bd; | |
3d6392cf JA |
700 | } |
701 | ||
702 | static int bsg_put_device(struct bsg_device *bd) | |
703 | { | |
704 | int ret = 0; | |
d45ac4fa | 705 | struct device *dev = bd->queue->bsg_dev.dev; |
3d6392cf JA |
706 | |
707 | mutex_lock(&bsg_mutex); | |
708 | ||
709 | if (!atomic_dec_and_test(&bd->ref_count)) | |
710 | goto out; | |
711 | ||
712 | dprintk("%s: tearing down\n", bd->name); | |
713 | ||
714 | /* | |
715 | * close can always block | |
716 | */ | |
717 | set_bit(BSG_F_BLOCK, &bd->flags); | |
718 | ||
719 | /* | |
720 | * correct error detection baddies here again. it's the responsibility | |
721 | * of the app to properly reap commands before close() if it wants | |
722 | * fool-proof error detection | |
723 | */ | |
724 | ret = bsg_complete_all_commands(bd); | |
725 | ||
726 | blk_put_queue(bd->queue); | |
727 | hlist_del(&bd->dev_list); | |
5309cb38 | 728 | kfree(bd); |
3d6392cf JA |
729 | out: |
730 | mutex_unlock(&bsg_mutex); | |
d45ac4fa | 731 | put_device(dev); |
3d6392cf JA |
732 | return ret; |
733 | } | |
734 | ||
735 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 736 | struct request_queue *rq, |
3d6392cf JA |
737 | struct file *file) |
738 | { | |
25fd1643 | 739 | struct bsg_device *bd; |
c3ff1b90 | 740 | int ret; |
3d6392cf JA |
741 | #ifdef BSG_DEBUG |
742 | unsigned char buf[32]; | |
743 | #endif | |
c3ff1b90 FT |
744 | ret = blk_get_queue(rq); |
745 | if (ret) | |
746 | return ERR_PTR(-ENXIO); | |
3d6392cf JA |
747 | |
748 | bd = bsg_alloc_device(); | |
c3ff1b90 FT |
749 | if (!bd) { |
750 | blk_put_queue(rq); | |
3d6392cf | 751 | return ERR_PTR(-ENOMEM); |
c3ff1b90 | 752 | } |
3d6392cf | 753 | |
d351af01 | 754 | bd->queue = rq; |
3d6392cf JA |
755 | bsg_set_block(bd, file); |
756 | ||
757 | atomic_set(&bd->ref_count, 1); | |
3d6392cf | 758 | mutex_lock(&bsg_mutex); |
842ea771 | 759 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cf | 760 | |
ee959b00 | 761 | strncpy(bd->name, rq->bsg_dev.class_dev->bus_id, sizeof(bd->name) - 1); |
3d6392cf | 762 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 763 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
764 | |
765 | mutex_unlock(&bsg_mutex); | |
766 | return bd; | |
767 | } | |
768 | ||
842ea771 | 769 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cf | 770 | { |
43ac9e62 | 771 | struct bsg_device *bd; |
3d6392cf JA |
772 | struct hlist_node *entry; |
773 | ||
774 | mutex_lock(&bsg_mutex); | |
775 | ||
43ac9e62 | 776 | hlist_for_each_entry(bd, entry, bsg_dev_idx_hash(minor), dev_list) { |
842ea771 | 777 | if (bd->queue == q) { |
3d6392cf | 778 | atomic_inc(&bd->ref_count); |
43ac9e62 | 779 | goto found; |
3d6392cf | 780 | } |
3d6392cf | 781 | } |
43ac9e62 FT |
782 | bd = NULL; |
783 | found: | |
3d6392cf JA |
784 | mutex_unlock(&bsg_mutex); |
785 | return bd; | |
786 | } | |
787 | ||
788 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
789 | { | |
598443a2 FT |
790 | struct bsg_device *bd; |
791 | struct bsg_class_device *bcd; | |
3d6392cf | 792 | |
3d6392cf JA |
793 | /* |
794 | * find the class device | |
795 | */ | |
3d6392cf | 796 | mutex_lock(&bsg_mutex); |
598443a2 | 797 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
d45ac4fa FT |
798 | if (bcd) |
799 | get_device(bcd->dev); | |
3d6392cf JA |
800 | mutex_unlock(&bsg_mutex); |
801 | ||
802 | if (!bcd) | |
803 | return ERR_PTR(-ENODEV); | |
804 | ||
842ea771 | 805 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
d45ac4fa FT |
806 | if (bd) |
807 | return bd; | |
808 | ||
809 | bd = bsg_add_device(inode, bcd->queue, file); | |
810 | if (IS_ERR(bd)) | |
811 | put_device(bcd->dev); | |
812 | ||
813 | return bd; | |
3d6392cf JA |
814 | } |
815 | ||
816 | static int bsg_open(struct inode *inode, struct file *file) | |
817 | { | |
818 | struct bsg_device *bd = bsg_get_device(inode, file); | |
819 | ||
820 | if (IS_ERR(bd)) | |
821 | return PTR_ERR(bd); | |
822 | ||
823 | file->private_data = bd; | |
824 | return 0; | |
825 | } | |
826 | ||
827 | static int bsg_release(struct inode *inode, struct file *file) | |
828 | { | |
829 | struct bsg_device *bd = file->private_data; | |
830 | ||
831 | file->private_data = NULL; | |
832 | return bsg_put_device(bd); | |
833 | } | |
834 | ||
835 | static unsigned int bsg_poll(struct file *file, poll_table *wait) | |
836 | { | |
837 | struct bsg_device *bd = file->private_data; | |
838 | unsigned int mask = 0; | |
839 | ||
840 | poll_wait(file, &bd->wq_done, wait); | |
841 | poll_wait(file, &bd->wq_free, wait); | |
842 | ||
843 | spin_lock_irq(&bd->lock); | |
844 | if (!list_empty(&bd->done_list)) | |
845 | mask |= POLLIN | POLLRDNORM; | |
846 | if (bd->queued_cmds >= bd->max_queue) | |
847 | mask |= POLLOUT; | |
848 | spin_unlock_irq(&bd->lock); | |
849 | ||
850 | return mask; | |
851 | } | |
852 | ||
25fd1643 | 853 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
854 | { |
855 | struct bsg_device *bd = file->private_data; | |
856 | int __user *uarg = (int __user *) arg; | |
2d507a01 | 857 | int ret; |
3d6392cf | 858 | |
3d6392cf JA |
859 | switch (cmd) { |
860 | /* | |
861 | * our own ioctls | |
862 | */ | |
863 | case SG_GET_COMMAND_Q: | |
864 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 865 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
866 | int queue; |
867 | ||
868 | if (get_user(queue, uarg)) | |
869 | return -EFAULT; | |
5309cb38 | 870 | if (queue < 1) |
3d6392cf JA |
871 | return -EINVAL; |
872 | ||
5309cb38 | 873 | spin_lock_irq(&bd->lock); |
3d6392cf | 874 | bd->max_queue = queue; |
5309cb38 | 875 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
876 | return 0; |
877 | } | |
878 | ||
879 | /* | |
880 | * SCSI/sg ioctls | |
881 | */ | |
882 | case SG_GET_VERSION_NUM: | |
883 | case SCSI_IOCTL_GET_IDLUN: | |
884 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
885 | case SG_SET_TIMEOUT: | |
886 | case SG_GET_TIMEOUT: | |
887 | case SG_GET_RESERVED_SIZE: | |
888 | case SG_SET_RESERVED_SIZE: | |
889 | case SG_EMULATED_HOST: | |
3d6392cf JA |
890 | case SCSI_IOCTL_SEND_COMMAND: { |
891 | void __user *uarg = (void __user *) arg; | |
d351af01 | 892 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
3d6392cf | 893 | } |
10e8855b FT |
894 | case SG_IO: { |
895 | struct request *rq; | |
2c9ecdf4 | 896 | struct bio *bio, *bidi_bio = NULL; |
10e8855b FT |
897 | struct sg_io_v4 hdr; |
898 | ||
899 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
900 | return -EFAULT; | |
901 | ||
902 | rq = bsg_map_hdr(bd, &hdr); | |
903 | if (IS_ERR(rq)) | |
904 | return PTR_ERR(rq); | |
905 | ||
906 | bio = rq->bio; | |
2c9ecdf4 FT |
907 | if (rq->next_rq) |
908 | bidi_bio = rq->next_rq->bio; | |
d351af01 | 909 | blk_execute_rq(bd->queue, NULL, rq, 0); |
2d507a01 | 910 | ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
911 | |
912 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
913 | return -EFAULT; | |
b711afa6 | 914 | |
2d507a01 | 915 | return ret; |
10e8855b | 916 | } |
3d6392cf JA |
917 | /* |
918 | * block device ioctls | |
919 | */ | |
920 | default: | |
921 | #if 0 | |
922 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
923 | #else | |
924 | return -ENOTTY; | |
925 | #endif | |
926 | } | |
927 | } | |
928 | ||
7344be05 | 929 | static const struct file_operations bsg_fops = { |
3d6392cf JA |
930 | .read = bsg_read, |
931 | .write = bsg_write, | |
932 | .poll = bsg_poll, | |
933 | .open = bsg_open, | |
934 | .release = bsg_release, | |
25fd1643 | 935 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf JA |
936 | .owner = THIS_MODULE, |
937 | }; | |
938 | ||
d351af01 | 939 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 940 | { |
d351af01 | 941 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 942 | |
df468820 FT |
943 | if (!bcd->class_dev) |
944 | return; | |
3d6392cf JA |
945 | |
946 | mutex_lock(&bsg_mutex); | |
598443a2 | 947 | idr_remove(&bsg_minor_idr, bcd->minor); |
d351af01 | 948 | sysfs_remove_link(&q->kobj, "bsg"); |
ee959b00 | 949 | device_unregister(bcd->class_dev); |
39dca558 | 950 | put_device(bcd->dev); |
3d6392cf | 951 | bcd->class_dev = NULL; |
3d6392cf JA |
952 | mutex_unlock(&bsg_mutex); |
953 | } | |
4cf0723a | 954 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 955 | |
39dca558 JB |
956 | int bsg_register_queue(struct request_queue *q, struct device *gdev, |
957 | const char *name) | |
3d6392cf | 958 | { |
598443a2 | 959 | struct bsg_class_device *bcd; |
3d6392cf | 960 | dev_t dev; |
598443a2 | 961 | int ret, minor; |
ee959b00 | 962 | struct device *class_dev = NULL; |
39dca558 JB |
963 | const char *devname; |
964 | ||
965 | if (name) | |
966 | devname = name; | |
967 | else | |
968 | devname = gdev->bus_id; | |
3d6392cf JA |
969 | |
970 | /* | |
971 | * we need a proper transport to send commands, not a stacked device | |
972 | */ | |
973 | if (!q->request_fn) | |
974 | return 0; | |
975 | ||
d351af01 | 976 | bcd = &q->bsg_dev; |
3d6392cf | 977 | memset(bcd, 0, sizeof(*bcd)); |
3d6392cf JA |
978 | |
979 | mutex_lock(&bsg_mutex); | |
292b7f27 | 980 | |
598443a2 FT |
981 | ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL); |
982 | if (!ret) { | |
983 | ret = -ENOMEM; | |
984 | goto unlock; | |
292b7f27 FT |
985 | } |
986 | ||
598443a2 FT |
987 | ret = idr_get_new(&bsg_minor_idr, bcd, &minor); |
988 | if (ret < 0) | |
989 | goto unlock; | |
292b7f27 | 990 | |
598443a2 FT |
991 | if (minor >= BSG_MAX_DEVS) { |
992 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
993 | ret = -EINVAL; | |
994 | goto remove_idr; | |
995 | } | |
996 | ||
997 | bcd->minor = minor; | |
d351af01 | 998 | bcd->queue = q; |
39dca558 | 999 | bcd->dev = get_device(gdev); |
46f6ef4a | 1000 | dev = MKDEV(bsg_major, bcd->minor); |
ee959b00 | 1001 | class_dev = device_create(bsg_class, gdev, dev, "%s", devname); |
4e2872d6 FT |
1002 | if (IS_ERR(class_dev)) { |
1003 | ret = PTR_ERR(class_dev); | |
598443a2 | 1004 | goto put_dev; |
4e2872d6 FT |
1005 | } |
1006 | bcd->class_dev = class_dev; | |
1007 | ||
abce891a | 1008 | if (q->kobj.sd) { |
4e2872d6 FT |
1009 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
1010 | if (ret) | |
598443a2 | 1011 | goto unregister_class_dev; |
4e2872d6 FT |
1012 | } |
1013 | ||
3d6392cf JA |
1014 | mutex_unlock(&bsg_mutex); |
1015 | return 0; | |
6826ee4f | 1016 | |
598443a2 | 1017 | unregister_class_dev: |
ee959b00 | 1018 | device_unregister(class_dev); |
598443a2 | 1019 | put_dev: |
39dca558 | 1020 | put_device(gdev); |
598443a2 FT |
1021 | remove_idr: |
1022 | idr_remove(&bsg_minor_idr, minor); | |
1023 | unlock: | |
264a0472 | 1024 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
1025 | return ret; |
1026 | } | |
4cf0723a | 1027 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 | 1028 | |
7e7654a9 | 1029 | static struct cdev bsg_cdev; |
292b7f27 | 1030 | |
3d6392cf JA |
1031 | static int __init bsg_init(void) |
1032 | { | |
1033 | int ret, i; | |
46f6ef4a | 1034 | dev_t devid; |
3d6392cf | 1035 | |
5309cb38 | 1036 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83 | 1037 | sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38 JA |
1038 | if (!bsg_cmd_cachep) { |
1039 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1040 | return -ENOMEM; | |
1041 | } | |
1042 | ||
25fd1643 | 1043 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1044 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1045 | ||
1046 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 | 1047 | if (IS_ERR(bsg_class)) { |
9b9f770c FT |
1048 | ret = PTR_ERR(bsg_class); |
1049 | goto destroy_kmemcache; | |
5309cb38 | 1050 | } |
3d6392cf | 1051 | |
46f6ef4a | 1052 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
1053 | if (ret) |
1054 | goto destroy_bsg_class; | |
292b7f27 | 1055 | |
46f6ef4a JA |
1056 | bsg_major = MAJOR(devid); |
1057 | ||
292b7f27 | 1058 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 1059 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
1060 | if (ret) |
1061 | goto unregister_chrdev; | |
3d6392cf | 1062 | |
5d3a8cd3 | 1063 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 1064 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 1065 | return 0; |
9b9f770c FT |
1066 | unregister_chrdev: |
1067 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
1068 | destroy_bsg_class: | |
1069 | class_destroy(bsg_class); | |
1070 | destroy_kmemcache: | |
1071 | kmem_cache_destroy(bsg_cmd_cachep); | |
1072 | return ret; | |
3d6392cf JA |
1073 | } |
1074 | ||
1075 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 1076 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
1077 | MODULE_LICENSE("GPL"); |
1078 | ||
4e2872d6 | 1079 | device_initcall(bsg_init); |