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Commit | Line | Data |
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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 JA |
71 | /* |
72 | * just for testing | |
73 | */ | |
74 | #define BSG_MAJOR (240) | |
75 | ||
76 | static DEFINE_MUTEX(bsg_mutex); | |
292b7f27 | 77 | static int bsg_device_nr, bsg_minor_idx; |
3d6392cf | 78 | |
25fd1643 JA |
79 | #define BSG_LIST_ARRAY_SIZE 8 |
80 | #define bsg_list_idx(minor) ((minor) & (BSG_LIST_ARRAY_SIZE - 1)) | |
81 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; | |
3d6392cf JA |
82 | |
83 | static struct class *bsg_class; | |
84 | static LIST_HEAD(bsg_class_list); | |
85 | ||
5309cb38 JA |
86 | static struct kmem_cache *bsg_cmd_cachep; |
87 | ||
3d6392cf JA |
88 | /* |
89 | * our internal command type | |
90 | */ | |
91 | struct bsg_command { | |
92 | struct bsg_device *bd; | |
93 | struct list_head list; | |
94 | struct request *rq; | |
95 | struct bio *bio; | |
2c9ecdf4 | 96 | struct bio *bidi_bio; |
3d6392cf | 97 | int err; |
70e36ece FT |
98 | struct sg_io_v4 hdr; |
99 | struct sg_io_v4 __user *uhdr; | |
3d6392cf JA |
100 | char sense[SCSI_SENSE_BUFFERSIZE]; |
101 | }; | |
102 | ||
103 | static void bsg_free_command(struct bsg_command *bc) | |
104 | { | |
105 | struct bsg_device *bd = bc->bd; | |
3d6392cf JA |
106 | unsigned long flags; |
107 | ||
5309cb38 | 108 | kmem_cache_free(bsg_cmd_cachep, bc); |
3d6392cf JA |
109 | |
110 | spin_lock_irqsave(&bd->lock, flags); | |
111 | bd->queued_cmds--; | |
3d6392cf JA |
112 | spin_unlock_irqrestore(&bd->lock, flags); |
113 | ||
114 | wake_up(&bd->wq_free); | |
115 | } | |
116 | ||
e7d72173 | 117 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
3d6392cf | 118 | { |
e7d72173 | 119 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
3d6392cf JA |
120 | |
121 | spin_lock_irq(&bd->lock); | |
122 | ||
123 | if (bd->queued_cmds >= bd->max_queue) | |
124 | goto out; | |
125 | ||
3d6392cf | 126 | bd->queued_cmds++; |
3d6392cf JA |
127 | spin_unlock_irq(&bd->lock); |
128 | ||
25fd1643 | 129 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
5309cb38 JA |
130 | if (unlikely(!bc)) { |
131 | spin_lock_irq(&bd->lock); | |
7e75d730 | 132 | bd->queued_cmds--; |
e7d72173 | 133 | bc = ERR_PTR(-ENOMEM); |
7e75d730 | 134 | goto out; |
5309cb38 JA |
135 | } |
136 | ||
3d6392cf JA |
137 | bc->bd = bd; |
138 | INIT_LIST_HEAD(&bc->list); | |
5309cb38 | 139 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
3d6392cf JA |
140 | return bc; |
141 | out: | |
3d6392cf JA |
142 | spin_unlock_irq(&bd->lock); |
143 | return bc; | |
144 | } | |
145 | ||
3d6392cf JA |
146 | static inline void |
147 | bsg_add_done_cmd(struct bsg_device *bd, struct bsg_command *bc) | |
148 | { | |
3d6392cf JA |
149 | } |
150 | ||
25fd1643 | 151 | static int bsg_io_schedule(struct bsg_device *bd) |
3d6392cf JA |
152 | { |
153 | DEFINE_WAIT(wait); | |
154 | int ret = 0; | |
155 | ||
156 | spin_lock_irq(&bd->lock); | |
157 | ||
158 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
159 | ||
160 | /* | |
161 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no | |
162 | * work to do", even though we return -ENOSPC after this same test | |
163 | * during bsg_write() -- there, it means our buffer can't have more | |
164 | * bsg_commands added to it, thus has no space left. | |
165 | */ | |
166 | if (bd->done_cmds == bd->queued_cmds) { | |
167 | ret = -ENODATA; | |
168 | goto unlock; | |
169 | } | |
170 | ||
171 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { | |
172 | ret = -EAGAIN; | |
173 | goto unlock; | |
174 | } | |
175 | ||
25fd1643 | 176 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
3d6392cf JA |
177 | spin_unlock_irq(&bd->lock); |
178 | io_schedule(); | |
179 | finish_wait(&bd->wq_done, &wait); | |
180 | ||
3d6392cf JA |
181 | return ret; |
182 | unlock: | |
183 | spin_unlock_irq(&bd->lock); | |
184 | return ret; | |
185 | } | |
186 | ||
70e36ece FT |
187 | static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq, |
188 | struct sg_io_v4 *hdr, int has_write_perm) | |
189 | { | |
190 | memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */ | |
191 | ||
192 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, | |
193 | hdr->request_len)) | |
194 | return -EFAULT; | |
15d10b61 FT |
195 | |
196 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { | |
197 | if (blk_verify_command(rq->cmd, has_write_perm)) | |
198 | return -EPERM; | |
199 | } else if (!capable(CAP_SYS_RAWIO)) | |
70e36ece FT |
200 | return -EPERM; |
201 | ||
202 | /* | |
203 | * fill in request structure | |
204 | */ | |
205 | rq->cmd_len = hdr->request_len; | |
206 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
207 | ||
208 | rq->timeout = (hdr->timeout * HZ) / 1000; | |
209 | if (!rq->timeout) | |
210 | rq->timeout = q->sg_timeout; | |
211 | if (!rq->timeout) | |
212 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
3d6392cf | 217 | /* |
70e36ece | 218 | * Check if sg_io_v4 from user is allowed and valid |
3d6392cf JA |
219 | */ |
220 | static int | |
70e36ece | 221 | bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw) |
3d6392cf | 222 | { |
15d10b61 FT |
223 | int ret = 0; |
224 | ||
70e36ece | 225 | if (hdr->guard != 'Q') |
3d6392cf | 226 | return -EINVAL; |
70e36ece | 227 | if (hdr->request_len > BLK_MAX_CDB) |
3d6392cf | 228 | return -EINVAL; |
70e36ece FT |
229 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
230 | hdr->din_xfer_len > (q->max_sectors << 9)) | |
3d6392cf JA |
231 | return -EIO; |
232 | ||
15d10b61 FT |
233 | switch (hdr->protocol) { |
234 | case BSG_PROTOCOL_SCSI: | |
235 | switch (hdr->subprotocol) { | |
236 | case BSG_SUB_PROTOCOL_SCSI_CMD: | |
237 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: | |
238 | break; | |
239 | default: | |
240 | ret = -EINVAL; | |
241 | } | |
242 | break; | |
243 | default: | |
244 | ret = -EINVAL; | |
245 | } | |
70e36ece | 246 | |
70e36ece | 247 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
15d10b61 | 248 | return ret; |
3d6392cf JA |
249 | } |
250 | ||
251 | /* | |
70e36ece | 252 | * map sg_io_v4 to a request. |
3d6392cf JA |
253 | */ |
254 | static struct request * | |
70e36ece | 255 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
3d6392cf JA |
256 | { |
257 | request_queue_t *q = bd->queue; | |
2c9ecdf4 | 258 | struct request *rq, *next_rq = NULL; |
25fd1643 | 259 | int ret, rw; |
70e36ece FT |
260 | unsigned int dxfer_len; |
261 | void *dxferp = NULL; | |
3d6392cf | 262 | |
70e36ece FT |
263 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
264 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, | |
265 | hdr->din_xfer_len); | |
3d6392cf | 266 | |
70e36ece | 267 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
3d6392cf JA |
268 | if (ret) |
269 | return ERR_PTR(ret); | |
270 | ||
271 | /* | |
272 | * map scatter-gather elements seperately and string them to request | |
273 | */ | |
274 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
2c9ecdf4 FT |
275 | if (!rq) |
276 | return ERR_PTR(-ENOMEM); | |
70e36ece FT |
277 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM, |
278 | &bd->flags)); | |
2c9ecdf4 FT |
279 | if (ret) |
280 | goto out; | |
281 | ||
282 | if (rw == WRITE && hdr->din_xfer_len) { | |
283 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { | |
284 | ret = -EOPNOTSUPP; | |
285 | goto out; | |
286 | } | |
287 | ||
288 | next_rq = blk_get_request(q, READ, GFP_KERNEL); | |
289 | if (!next_rq) { | |
290 | ret = -ENOMEM; | |
291 | goto out; | |
292 | } | |
293 | rq->next_rq = next_rq; | |
294 | ||
295 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
296 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); | |
297 | if (ret) | |
298 | goto out; | |
3d6392cf JA |
299 | } |
300 | ||
70e36ece FT |
301 | if (hdr->dout_xfer_len) { |
302 | dxfer_len = hdr->dout_xfer_len; | |
303 | dxferp = (void*)(unsigned long)hdr->dout_xferp; | |
304 | } else if (hdr->din_xfer_len) { | |
305 | dxfer_len = hdr->din_xfer_len; | |
306 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
307 | } else | |
308 | dxfer_len = 0; | |
309 | ||
310 | if (dxfer_len) { | |
311 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); | |
2c9ecdf4 FT |
312 | if (ret) |
313 | goto out; | |
3d6392cf | 314 | } |
3d6392cf | 315 | return rq; |
2c9ecdf4 FT |
316 | out: |
317 | blk_put_request(rq); | |
318 | if (next_rq) { | |
319 | blk_rq_unmap_user(next_rq->bio); | |
320 | blk_put_request(next_rq); | |
321 | } | |
322 | return ERR_PTR(ret); | |
3d6392cf JA |
323 | } |
324 | ||
325 | /* | |
326 | * async completion call-back from the block layer, when scsi/ide/whatever | |
327 | * calls end_that_request_last() on a request | |
328 | */ | |
329 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
330 | { | |
331 | struct bsg_command *bc = rq->end_io_data; | |
332 | struct bsg_device *bd = bc->bd; | |
333 | unsigned long flags; | |
334 | ||
5309cb38 JA |
335 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
336 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
337 | |
338 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
339 | ||
340 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
341 | list_move_tail(&bc->list, &bd->done_list); |
342 | bd->done_cmds++; | |
3d6392cf | 343 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
344 | |
345 | wake_up(&bd->wq_done); | |
3d6392cf JA |
346 | } |
347 | ||
348 | /* | |
349 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
350 | * layer for io | |
351 | */ | |
352 | static void bsg_add_command(struct bsg_device *bd, request_queue_t *q, | |
353 | struct bsg_command *bc, struct request *rq) | |
354 | { | |
355 | rq->sense = bc->sense; | |
356 | rq->sense_len = 0; | |
357 | ||
358 | /* | |
359 | * add bc command to busy queue and submit rq for io | |
360 | */ | |
361 | bc->rq = rq; | |
362 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
363 | if (rq->next_rq) |
364 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
365 | bc->hdr.duration = jiffies; |
366 | spin_lock_irq(&bd->lock); | |
367 | list_add_tail(&bc->list, &bd->busy_list); | |
368 | spin_unlock_irq(&bd->lock); | |
369 | ||
370 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
371 | ||
372 | rq->end_io_data = bc; | |
d351af01 | 373 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
3d6392cf JA |
374 | } |
375 | ||
25fd1643 | 376 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
377 | { |
378 | struct bsg_command *bc = NULL; | |
379 | ||
380 | spin_lock_irq(&bd->lock); | |
381 | if (bd->done_cmds) { | |
25fd1643 JA |
382 | bc = list_entry(bd->done_list.next, struct bsg_command, list); |
383 | list_del(&bc->list); | |
384 | bd->done_cmds--; | |
3d6392cf JA |
385 | } |
386 | spin_unlock_irq(&bd->lock); | |
387 | ||
388 | return bc; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Get a finished command from the done list | |
393 | */ | |
e7d72173 | 394 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
395 | { |
396 | struct bsg_command *bc; | |
397 | int ret; | |
398 | ||
399 | do { | |
400 | bc = bsg_next_done_cmd(bd); | |
401 | if (bc) | |
402 | break; | |
403 | ||
e7d72173 FT |
404 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
405 | bc = ERR_PTR(-EAGAIN); | |
406 | break; | |
407 | } | |
408 | ||
409 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 410 | if (ret) { |
e7d72173 | 411 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
412 | break; |
413 | } | |
414 | } while (1); | |
415 | ||
416 | dprintk("%s: returning done %p\n", bd->name, bc); | |
417 | ||
418 | return bc; | |
419 | } | |
420 | ||
70e36ece | 421 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 422 | struct bio *bio, struct bio *bidi_bio) |
70e36ece FT |
423 | { |
424 | int ret = 0; | |
425 | ||
426 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); | |
427 | /* | |
428 | * fill in all the output members | |
429 | */ | |
430 | hdr->device_status = status_byte(rq->errors); | |
431 | hdr->transport_status = host_byte(rq->errors); | |
432 | hdr->driver_status = driver_byte(rq->errors); | |
433 | hdr->info = 0; | |
434 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
435 | hdr->info |= SG_INFO_CHECK; | |
436 | hdr->din_resid = rq->data_len; | |
437 | hdr->response_len = 0; | |
438 | ||
439 | if (rq->sense_len && hdr->response) { | |
25fd1643 JA |
440 | int len = min_t(unsigned int, hdr->max_response_len, |
441 | rq->sense_len); | |
70e36ece FT |
442 | |
443 | ret = copy_to_user((void*)(unsigned long)hdr->response, | |
444 | rq->sense, len); | |
445 | if (!ret) | |
446 | hdr->response_len = len; | |
447 | else | |
448 | ret = -EFAULT; | |
449 | } | |
450 | ||
2c9ecdf4 FT |
451 | if (rq->next_rq) { |
452 | blk_rq_unmap_user(bidi_bio); | |
453 | blk_put_request(rq->next_rq); | |
454 | } | |
455 | ||
70e36ece FT |
456 | blk_rq_unmap_user(bio); |
457 | blk_put_request(rq); | |
458 | ||
459 | return ret; | |
460 | } | |
461 | ||
3d6392cf JA |
462 | static int bsg_complete_all_commands(struct bsg_device *bd) |
463 | { | |
464 | struct bsg_command *bc; | |
465 | int ret, tret; | |
466 | ||
467 | dprintk("%s: entered\n", bd->name); | |
468 | ||
469 | set_bit(BSG_F_BLOCK, &bd->flags); | |
470 | ||
471 | /* | |
472 | * wait for all commands to complete | |
473 | */ | |
474 | ret = 0; | |
475 | do { | |
25fd1643 | 476 | ret = bsg_io_schedule(bd); |
3d6392cf JA |
477 | /* |
478 | * look for -ENODATA specifically -- we'll sometimes get | |
479 | * -ERESTARTSYS when we've taken a signal, but we can't | |
480 | * return until we're done freeing the queue, so ignore | |
481 | * it. The signal will get handled when we're done freeing | |
482 | * the bsg_device. | |
483 | */ | |
484 | } while (ret != -ENODATA); | |
485 | ||
486 | /* | |
487 | * discard done commands | |
488 | */ | |
489 | ret = 0; | |
490 | do { | |
e7d72173 FT |
491 | spin_lock_irq(&bd->lock); |
492 | if (!bd->queued_cmds) { | |
493 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
494 | break; |
495 | } | |
efba1a31 | 496 | spin_unlock_irq(&bd->lock); |
3d6392cf | 497 | |
e7d72173 FT |
498 | bc = bsg_get_done_cmd(bd); |
499 | if (IS_ERR(bc)) | |
500 | break; | |
501 | ||
2c9ecdf4 FT |
502 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
503 | bc->bidi_bio); | |
3d6392cf JA |
504 | if (!ret) |
505 | ret = tret; | |
506 | ||
507 | bsg_free_command(bc); | |
508 | } while (1); | |
509 | ||
510 | return ret; | |
511 | } | |
512 | ||
25fd1643 | 513 | static int |
e7d72173 FT |
514 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
515 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
516 | { |
517 | struct bsg_command *bc; | |
518 | int nr_commands, ret; | |
519 | ||
70e36ece | 520 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
521 | return -EINVAL; |
522 | ||
523 | ret = 0; | |
70e36ece | 524 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 525 | while (nr_commands) { |
e7d72173 | 526 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
527 | if (IS_ERR(bc)) { |
528 | ret = PTR_ERR(bc); | |
529 | break; | |
530 | } | |
531 | ||
532 | /* | |
533 | * this is the only case where we need to copy data back | |
534 | * after completing the request. so do that here, | |
535 | * bsg_complete_work() cannot do that for us | |
536 | */ | |
2c9ecdf4 FT |
537 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
538 | bc->bidi_bio); | |
3d6392cf | 539 | |
25fd1643 | 540 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
541 | ret = -EFAULT; |
542 | ||
543 | bsg_free_command(bc); | |
544 | ||
545 | if (ret) | |
546 | break; | |
547 | ||
70e36ece FT |
548 | buf += sizeof(struct sg_io_v4); |
549 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
550 | nr_commands--; |
551 | } | |
552 | ||
553 | return ret; | |
554 | } | |
555 | ||
556 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
557 | { | |
558 | if (file->f_flags & O_NONBLOCK) | |
559 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
560 | else | |
561 | set_bit(BSG_F_BLOCK, &bd->flags); | |
562 | } | |
563 | ||
564 | static inline void bsg_set_write_perm(struct bsg_device *bd, struct file *file) | |
565 | { | |
566 | if (file->f_mode & FMODE_WRITE) | |
567 | set_bit(BSG_F_WRITE_PERM, &bd->flags); | |
568 | else | |
569 | clear_bit(BSG_F_WRITE_PERM, &bd->flags); | |
570 | } | |
571 | ||
25fd1643 JA |
572 | /* |
573 | * Check if the error is a "real" error that we should return. | |
574 | */ | |
3d6392cf JA |
575 | static inline int err_block_err(int ret) |
576 | { | |
577 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
578 | return 1; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | static ssize_t | |
584 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
585 | { | |
586 | struct bsg_device *bd = file->private_data; | |
587 | int ret; | |
588 | ssize_t bytes_read; | |
589 | ||
9e69fbb5 | 590 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
3d6392cf JA |
591 | |
592 | bsg_set_block(bd, file); | |
593 | bytes_read = 0; | |
e7d72173 | 594 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
595 | *ppos = bytes_read; |
596 | ||
597 | if (!bytes_read || (bytes_read && err_block_err(ret))) | |
598 | bytes_read = ret; | |
599 | ||
600 | return bytes_read; | |
601 | } | |
602 | ||
25fd1643 JA |
603 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
604 | size_t count, ssize_t *bytes_written) | |
3d6392cf JA |
605 | { |
606 | struct bsg_command *bc; | |
607 | struct request *rq; | |
608 | int ret, nr_commands; | |
609 | ||
70e36ece | 610 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
611 | return -EINVAL; |
612 | ||
70e36ece | 613 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
614 | rq = NULL; |
615 | bc = NULL; | |
616 | ret = 0; | |
617 | while (nr_commands) { | |
618 | request_queue_t *q = bd->queue; | |
3d6392cf | 619 | |
e7d72173 | 620 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
621 | if (IS_ERR(bc)) { |
622 | ret = PTR_ERR(bc); | |
623 | bc = NULL; | |
624 | break; | |
625 | } | |
626 | ||
70e36ece | 627 | bc->uhdr = (struct sg_io_v4 __user *) buf; |
3d6392cf JA |
628 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
629 | ret = -EFAULT; | |
630 | break; | |
631 | } | |
632 | ||
633 | /* | |
634 | * get a request, fill in the blanks, and add to request queue | |
635 | */ | |
70e36ece | 636 | rq = bsg_map_hdr(bd, &bc->hdr); |
3d6392cf JA |
637 | if (IS_ERR(rq)) { |
638 | ret = PTR_ERR(rq); | |
639 | rq = NULL; | |
640 | break; | |
641 | } | |
642 | ||
643 | bsg_add_command(bd, q, bc, rq); | |
644 | bc = NULL; | |
645 | rq = NULL; | |
646 | nr_commands--; | |
70e36ece | 647 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 648 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
649 | } |
650 | ||
3d6392cf JA |
651 | if (bc) |
652 | bsg_free_command(bc); | |
653 | ||
654 | return ret; | |
655 | } | |
656 | ||
657 | static ssize_t | |
658 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
659 | { | |
660 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 661 | ssize_t bytes_written; |
3d6392cf JA |
662 | int ret; |
663 | ||
9e69fbb5 | 664 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
3d6392cf JA |
665 | |
666 | bsg_set_block(bd, file); | |
667 | bsg_set_write_perm(bd, file); | |
668 | ||
25fd1643 JA |
669 | bytes_written = 0; |
670 | ret = __bsg_write(bd, buf, count, &bytes_written); | |
671 | *ppos = bytes_written; | |
3d6392cf JA |
672 | |
673 | /* | |
674 | * return bytes written on non-fatal errors | |
675 | */ | |
25fd1643 JA |
676 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
677 | bytes_written = ret; | |
3d6392cf | 678 | |
25fd1643 JA |
679 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
680 | return bytes_written; | |
3d6392cf JA |
681 | } |
682 | ||
3d6392cf JA |
683 | static struct bsg_device *bsg_alloc_device(void) |
684 | { | |
3d6392cf | 685 | struct bsg_device *bd; |
3d6392cf JA |
686 | |
687 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
688 | if (unlikely(!bd)) | |
689 | return NULL; | |
690 | ||
691 | spin_lock_init(&bd->lock); | |
692 | ||
5309cb38 | 693 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
694 | |
695 | INIT_LIST_HEAD(&bd->busy_list); | |
696 | INIT_LIST_HEAD(&bd->done_list); | |
697 | INIT_HLIST_NODE(&bd->dev_list); | |
698 | ||
699 | init_waitqueue_head(&bd->wq_free); | |
700 | init_waitqueue_head(&bd->wq_done); | |
701 | return bd; | |
3d6392cf JA |
702 | } |
703 | ||
704 | static int bsg_put_device(struct bsg_device *bd) | |
705 | { | |
706 | int ret = 0; | |
707 | ||
708 | mutex_lock(&bsg_mutex); | |
709 | ||
710 | if (!atomic_dec_and_test(&bd->ref_count)) | |
711 | goto out; | |
712 | ||
713 | dprintk("%s: tearing down\n", bd->name); | |
714 | ||
715 | /* | |
716 | * close can always block | |
717 | */ | |
718 | set_bit(BSG_F_BLOCK, &bd->flags); | |
719 | ||
720 | /* | |
721 | * correct error detection baddies here again. it's the responsibility | |
722 | * of the app to properly reap commands before close() if it wants | |
723 | * fool-proof error detection | |
724 | */ | |
725 | ret = bsg_complete_all_commands(bd); | |
726 | ||
727 | blk_put_queue(bd->queue); | |
728 | hlist_del(&bd->dev_list); | |
5309cb38 | 729 | kfree(bd); |
3d6392cf JA |
730 | out: |
731 | mutex_unlock(&bsg_mutex); | |
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; |
3d6392cf JA |
740 | #ifdef BSG_DEBUG |
741 | unsigned char buf[32]; | |
742 | #endif | |
743 | ||
744 | bd = bsg_alloc_device(); | |
745 | if (!bd) | |
746 | return ERR_PTR(-ENOMEM); | |
747 | ||
d351af01 FT |
748 | bd->queue = rq; |
749 | kobject_get(&rq->kobj); | |
3d6392cf JA |
750 | bsg_set_block(bd, file); |
751 | ||
752 | atomic_set(&bd->ref_count, 1); | |
753 | bd->minor = iminor(inode); | |
754 | mutex_lock(&bsg_mutex); | |
25fd1643 JA |
755 | hlist_add_head(&bd->dev_list, |
756 | &bsg_device_list[bd->minor & (BSG_LIST_ARRAY_SIZE - 1)]); | |
3d6392cf | 757 | |
d351af01 | 758 | strncpy(bd->name, rq->bsg_dev.class_dev->class_id, sizeof(bd->name) - 1); |
3d6392cf | 759 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 760 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
761 | |
762 | mutex_unlock(&bsg_mutex); | |
763 | return bd; | |
764 | } | |
765 | ||
766 | static struct bsg_device *__bsg_get_device(int minor) | |
767 | { | |
25fd1643 | 768 | struct hlist_head *list; |
3d6392cf JA |
769 | struct bsg_device *bd = NULL; |
770 | struct hlist_node *entry; | |
771 | ||
772 | mutex_lock(&bsg_mutex); | |
773 | ||
25fd1643 | 774 | list = &bsg_device_list[minor & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cf JA |
775 | hlist_for_each(entry, list) { |
776 | bd = hlist_entry(entry, struct bsg_device, dev_list); | |
777 | if (bd->minor == minor) { | |
778 | atomic_inc(&bd->ref_count); | |
779 | break; | |
780 | } | |
781 | ||
782 | bd = NULL; | |
783 | } | |
784 | ||
785 | mutex_unlock(&bsg_mutex); | |
786 | return bd; | |
787 | } | |
788 | ||
789 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
790 | { | |
791 | struct bsg_device *bd = __bsg_get_device(iminor(inode)); | |
792 | struct bsg_class_device *bcd, *__bcd; | |
793 | ||
794 | if (bd) | |
795 | return bd; | |
796 | ||
797 | /* | |
798 | * find the class device | |
799 | */ | |
800 | bcd = NULL; | |
801 | mutex_lock(&bsg_mutex); | |
802 | list_for_each_entry(__bcd, &bsg_class_list, list) { | |
803 | if (__bcd->minor == iminor(inode)) { | |
804 | bcd = __bcd; | |
805 | break; | |
806 | } | |
807 | } | |
808 | mutex_unlock(&bsg_mutex); | |
809 | ||
810 | if (!bcd) | |
811 | return ERR_PTR(-ENODEV); | |
812 | ||
d351af01 | 813 | return bsg_add_device(inode, bcd->queue, file); |
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; | |
857 | ||
3d6392cf JA |
858 | switch (cmd) { |
859 | /* | |
860 | * our own ioctls | |
861 | */ | |
862 | case SG_GET_COMMAND_Q: | |
863 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 864 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
865 | int queue; |
866 | ||
867 | if (get_user(queue, uarg)) | |
868 | return -EFAULT; | |
5309cb38 | 869 | if (queue < 1) |
3d6392cf JA |
870 | return -EINVAL; |
871 | ||
5309cb38 | 872 | spin_lock_irq(&bd->lock); |
3d6392cf | 873 | bd->max_queue = queue; |
5309cb38 | 874 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
875 | return 0; |
876 | } | |
877 | ||
878 | /* | |
879 | * SCSI/sg ioctls | |
880 | */ | |
881 | case SG_GET_VERSION_NUM: | |
882 | case SCSI_IOCTL_GET_IDLUN: | |
883 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
884 | case SG_SET_TIMEOUT: | |
885 | case SG_GET_TIMEOUT: | |
886 | case SG_GET_RESERVED_SIZE: | |
887 | case SG_SET_RESERVED_SIZE: | |
888 | case SG_EMULATED_HOST: | |
3d6392cf JA |
889 | case SCSI_IOCTL_SEND_COMMAND: { |
890 | void __user *uarg = (void __user *) arg; | |
d351af01 | 891 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
3d6392cf | 892 | } |
10e8855b FT |
893 | case SG_IO: { |
894 | struct request *rq; | |
2c9ecdf4 | 895 | struct bio *bio, *bidi_bio = NULL; |
10e8855b FT |
896 | struct sg_io_v4 hdr; |
897 | ||
898 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
899 | return -EFAULT; | |
900 | ||
901 | rq = bsg_map_hdr(bd, &hdr); | |
902 | if (IS_ERR(rq)) | |
903 | return PTR_ERR(rq); | |
904 | ||
905 | bio = rq->bio; | |
2c9ecdf4 FT |
906 | if (rq->next_rq) |
907 | bidi_bio = rq->next_rq->bio; | |
d351af01 | 908 | blk_execute_rq(bd->queue, NULL, rq, 0); |
2c9ecdf4 | 909 | blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
910 | |
911 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
912 | return -EFAULT; | |
b711afa6 JA |
913 | |
914 | return 0; | |
10e8855b | 915 | } |
3d6392cf JA |
916 | /* |
917 | * block device ioctls | |
918 | */ | |
919 | default: | |
920 | #if 0 | |
921 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
922 | #else | |
923 | return -ENOTTY; | |
924 | #endif | |
925 | } | |
926 | } | |
927 | ||
928 | static struct file_operations bsg_fops = { | |
929 | .read = bsg_read, | |
930 | .write = bsg_write, | |
931 | .poll = bsg_poll, | |
932 | .open = bsg_open, | |
933 | .release = bsg_release, | |
25fd1643 | 934 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf JA |
935 | .owner = THIS_MODULE, |
936 | }; | |
937 | ||
d351af01 | 938 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 939 | { |
d351af01 | 940 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 941 | |
25fd1643 | 942 | WARN_ON(!bcd->class_dev); |
3d6392cf JA |
943 | |
944 | mutex_lock(&bsg_mutex); | |
d351af01 | 945 | sysfs_remove_link(&q->kobj, "bsg"); |
3d6392cf JA |
946 | class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor)); |
947 | bcd->class_dev = NULL; | |
948 | list_del_init(&bcd->list); | |
292b7f27 | 949 | bsg_device_nr--; |
3d6392cf JA |
950 | mutex_unlock(&bsg_mutex); |
951 | } | |
4cf0723a | 952 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 953 | |
4cf0723a | 954 | int bsg_register_queue(struct request_queue *q, const char *name) |
3d6392cf | 955 | { |
292b7f27 | 956 | struct bsg_class_device *bcd, *__bcd; |
3d6392cf | 957 | dev_t dev; |
292b7f27 | 958 | int ret = -EMFILE; |
4e2872d6 | 959 | struct class_device *class_dev = NULL; |
3d6392cf JA |
960 | |
961 | /* | |
962 | * we need a proper transport to send commands, not a stacked device | |
963 | */ | |
964 | if (!q->request_fn) | |
965 | return 0; | |
966 | ||
d351af01 | 967 | bcd = &q->bsg_dev; |
3d6392cf JA |
968 | memset(bcd, 0, sizeof(*bcd)); |
969 | INIT_LIST_HEAD(&bcd->list); | |
970 | ||
971 | mutex_lock(&bsg_mutex); | |
292b7f27 FT |
972 | if (bsg_device_nr == BSG_MAX_DEVS) { |
973 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
974 | goto err; | |
975 | } | |
976 | ||
977 | retry: | |
978 | list_for_each_entry(__bcd, &bsg_class_list, list) { | |
979 | if (__bcd->minor == bsg_minor_idx) { | |
980 | bsg_minor_idx++; | |
981 | if (bsg_minor_idx == BSG_MAX_DEVS) | |
982 | bsg_minor_idx = 0; | |
983 | goto retry; | |
984 | } | |
985 | } | |
986 | ||
987 | bcd->minor = bsg_minor_idx++; | |
988 | if (bsg_minor_idx == BSG_MAX_DEVS) | |
989 | bsg_minor_idx = 0; | |
990 | ||
d351af01 | 991 | bcd->queue = q; |
292b7f27 | 992 | dev = MKDEV(BSG_MAJOR, bcd->minor); |
4e2872d6 FT |
993 | class_dev = class_device_create(bsg_class, NULL, dev, bcd->dev, "%s", name); |
994 | if (IS_ERR(class_dev)) { | |
995 | ret = PTR_ERR(class_dev); | |
264a0472 | 996 | goto err; |
4e2872d6 FT |
997 | } |
998 | bcd->class_dev = class_dev; | |
999 | ||
abce891a | 1000 | if (q->kobj.sd) { |
4e2872d6 FT |
1001 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
1002 | if (ret) | |
1003 | goto err; | |
1004 | } | |
1005 | ||
3d6392cf | 1006 | list_add_tail(&bcd->list, &bsg_class_list); |
292b7f27 | 1007 | bsg_device_nr++; |
4e2872d6 | 1008 | |
3d6392cf JA |
1009 | mutex_unlock(&bsg_mutex); |
1010 | return 0; | |
264a0472 | 1011 | err: |
4e2872d6 | 1012 | if (class_dev) |
264a0472 JA |
1013 | class_device_destroy(bsg_class, MKDEV(BSG_MAJOR, bcd->minor)); |
1014 | mutex_unlock(&bsg_mutex); | |
4e2872d6 FT |
1015 | return ret; |
1016 | } | |
4cf0723a | 1017 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 FT |
1018 | |
1019 | static int bsg_add(struct class_device *cl_dev, struct class_interface *cl_intf) | |
1020 | { | |
1021 | int ret; | |
1022 | struct scsi_device *sdp = to_scsi_device(cl_dev->dev); | |
1023 | struct request_queue *rq = sdp->request_queue; | |
1024 | ||
1025 | if (rq->kobj.parent) | |
1026 | ret = bsg_register_queue(rq, kobject_name(rq->kobj.parent)); | |
1027 | else | |
1028 | ret = bsg_register_queue(rq, kobject_name(&sdp->sdev_gendev.kobj)); | |
1029 | return ret; | |
3d6392cf JA |
1030 | } |
1031 | ||
4e2872d6 FT |
1032 | static void bsg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
1033 | { | |
1034 | bsg_unregister_queue(to_scsi_device(cl_dev->dev)->request_queue); | |
1035 | } | |
1036 | ||
1037 | static struct class_interface bsg_intf = { | |
1038 | .add = bsg_add, | |
1039 | .remove = bsg_remove, | |
1040 | }; | |
1041 | ||
292b7f27 FT |
1042 | static struct cdev bsg_cdev = { |
1043 | .kobj = {.name = "bsg", }, | |
1044 | .owner = THIS_MODULE, | |
1045 | }; | |
1046 | ||
3d6392cf JA |
1047 | static int __init bsg_init(void) |
1048 | { | |
1049 | int ret, i; | |
1050 | ||
5309cb38 JA |
1051 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
1052 | sizeof(struct bsg_command), 0, 0, NULL, NULL); | |
1053 | if (!bsg_cmd_cachep) { | |
1054 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1055 | return -ENOMEM; | |
1056 | } | |
1057 | ||
25fd1643 | 1058 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1059 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1060 | ||
1061 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 JA |
1062 | if (IS_ERR(bsg_class)) { |
1063 | kmem_cache_destroy(bsg_cmd_cachep); | |
3d6392cf | 1064 | return PTR_ERR(bsg_class); |
5309cb38 | 1065 | } |
3d6392cf | 1066 | |
292b7f27 FT |
1067 | ret = register_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS, "bsg"); |
1068 | if (ret) { | |
1069 | kmem_cache_destroy(bsg_cmd_cachep); | |
1070 | class_destroy(bsg_class); | |
1071 | return ret; | |
1072 | } | |
1073 | ||
1074 | cdev_init(&bsg_cdev, &bsg_fops); | |
1075 | ret = cdev_add(&bsg_cdev, MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS); | |
3d6392cf | 1076 | if (ret) { |
5309cb38 | 1077 | kmem_cache_destroy(bsg_cmd_cachep); |
3d6392cf | 1078 | class_destroy(bsg_class); |
292b7f27 | 1079 | unregister_chrdev_region(MKDEV(BSG_MAJOR, 0), BSG_MAX_DEVS); |
3d6392cf JA |
1080 | return ret; |
1081 | } | |
1082 | ||
4e2872d6 FT |
1083 | ret = scsi_register_interface(&bsg_intf); |
1084 | if (ret) { | |
1085 | printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret); | |
1086 | kmem_cache_destroy(bsg_cmd_cachep); | |
1087 | class_destroy(bsg_class); | |
1088 | unregister_chrdev(BSG_MAJOR, "bsg"); | |
1089 | return ret; | |
1090 | } | |
1091 | ||
3d6392cf JA |
1092 | printk(KERN_INFO "%s loaded\n", bsg_version); |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | MODULE_AUTHOR("Jens Axboe"); | |
1097 | MODULE_DESCRIPTION("Block layer SGSI generic (sg) driver"); | |
1098 | MODULE_LICENSE("GPL"); | |
1099 | ||
4e2872d6 | 1100 | device_initcall(bsg_init); |