Commit | Line | Data |
---|---|---|
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 | 21 | #include <linux/bsg.h> |
75bd2ef1 | 22 | #include <linux/smp_lock.h> |
3d6392cf JA |
23 | |
24 | #include <scsi/scsi.h> | |
25 | #include <scsi/scsi_ioctl.h> | |
26 | #include <scsi/scsi_cmnd.h> | |
4e2872d6 FT |
27 | #include <scsi/scsi_device.h> |
28 | #include <scsi/scsi_driver.h> | |
3d6392cf JA |
29 | #include <scsi/sg.h> |
30 | ||
0ed081ce FT |
31 | #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" |
32 | #define BSG_VERSION "0.4" | |
3d6392cf | 33 | |
3d6392cf | 34 | struct bsg_device { |
165125e1 | 35 | struct request_queue *queue; |
3d6392cf JA |
36 | spinlock_t lock; |
37 | struct list_head busy_list; | |
38 | struct list_head done_list; | |
39 | struct hlist_node dev_list; | |
40 | atomic_t ref_count; | |
3d6392cf JA |
41 | int queued_cmds; |
42 | int done_cmds; | |
3d6392cf JA |
43 | wait_queue_head_t wq_done; |
44 | wait_queue_head_t wq_free; | |
d351af01 | 45 | char name[BUS_ID_SIZE]; |
3d6392cf JA |
46 | int max_queue; |
47 | unsigned long flags; | |
0b07de85 AG |
48 | struct blk_scsi_cmd_filter *cmd_filter; |
49 | mode_t *f_mode; | |
3d6392cf JA |
50 | }; |
51 | ||
52 | enum { | |
53 | BSG_F_BLOCK = 1, | |
3d6392cf JA |
54 | }; |
55 | ||
5309cb38 | 56 | #define BSG_DEFAULT_CMDS 64 |
292b7f27 | 57 | #define BSG_MAX_DEVS 32768 |
3d6392cf JA |
58 | |
59 | #undef BSG_DEBUG | |
60 | ||
61 | #ifdef BSG_DEBUG | |
24c03d47 | 62 | #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args) |
3d6392cf JA |
63 | #else |
64 | #define dprintk(fmt, args...) | |
65 | #endif | |
66 | ||
3d6392cf | 67 | static DEFINE_MUTEX(bsg_mutex); |
598443a2 | 68 | static DEFINE_IDR(bsg_minor_idr); |
3d6392cf | 69 | |
25fd1643 | 70 | #define BSG_LIST_ARRAY_SIZE 8 |
25fd1643 | 71 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
3d6392cf JA |
72 | |
73 | static struct class *bsg_class; | |
46f6ef4a | 74 | static int bsg_major; |
3d6392cf | 75 | |
5309cb38 JA |
76 | static struct kmem_cache *bsg_cmd_cachep; |
77 | ||
3d6392cf JA |
78 | /* |
79 | * our internal command type | |
80 | */ | |
81 | struct bsg_command { | |
82 | struct bsg_device *bd; | |
83 | struct list_head list; | |
84 | struct request *rq; | |
85 | struct bio *bio; | |
2c9ecdf4 | 86 | struct bio *bidi_bio; |
3d6392cf | 87 | int err; |
70e36ece | 88 | struct sg_io_v4 hdr; |
3d6392cf JA |
89 | char sense[SCSI_SENSE_BUFFERSIZE]; |
90 | }; | |
91 | ||
92 | static void bsg_free_command(struct bsg_command *bc) | |
93 | { | |
94 | struct bsg_device *bd = bc->bd; | |
3d6392cf JA |
95 | unsigned long flags; |
96 | ||
5309cb38 | 97 | kmem_cache_free(bsg_cmd_cachep, bc); |
3d6392cf JA |
98 | |
99 | spin_lock_irqsave(&bd->lock, flags); | |
100 | bd->queued_cmds--; | |
3d6392cf JA |
101 | spin_unlock_irqrestore(&bd->lock, flags); |
102 | ||
103 | wake_up(&bd->wq_free); | |
104 | } | |
105 | ||
e7d72173 | 106 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
3d6392cf | 107 | { |
e7d72173 | 108 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
3d6392cf JA |
109 | |
110 | spin_lock_irq(&bd->lock); | |
111 | ||
112 | if (bd->queued_cmds >= bd->max_queue) | |
113 | goto out; | |
114 | ||
3d6392cf | 115 | bd->queued_cmds++; |
3d6392cf JA |
116 | spin_unlock_irq(&bd->lock); |
117 | ||
25fd1643 | 118 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
5309cb38 JA |
119 | if (unlikely(!bc)) { |
120 | spin_lock_irq(&bd->lock); | |
7e75d730 | 121 | bd->queued_cmds--; |
e7d72173 | 122 | bc = ERR_PTR(-ENOMEM); |
7e75d730 | 123 | goto out; |
5309cb38 JA |
124 | } |
125 | ||
3d6392cf JA |
126 | bc->bd = bd; |
127 | INIT_LIST_HEAD(&bc->list); | |
5309cb38 | 128 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
3d6392cf JA |
129 | return bc; |
130 | out: | |
3d6392cf JA |
131 | spin_unlock_irq(&bd->lock); |
132 | return bc; | |
133 | } | |
134 | ||
1c1133e1 | 135 | static inline struct hlist_head *bsg_dev_idx_hash(int index) |
3d6392cf | 136 | { |
1c1133e1 | 137 | return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cf JA |
138 | } |
139 | ||
25fd1643 | 140 | static int bsg_io_schedule(struct bsg_device *bd) |
3d6392cf JA |
141 | { |
142 | DEFINE_WAIT(wait); | |
143 | int ret = 0; | |
144 | ||
145 | spin_lock_irq(&bd->lock); | |
146 | ||
147 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
148 | ||
149 | /* | |
150 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no | |
151 | * work to do", even though we return -ENOSPC after this same test | |
152 | * during bsg_write() -- there, it means our buffer can't have more | |
153 | * bsg_commands added to it, thus has no space left. | |
154 | */ | |
155 | if (bd->done_cmds == bd->queued_cmds) { | |
156 | ret = -ENODATA; | |
157 | goto unlock; | |
158 | } | |
159 | ||
160 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { | |
161 | ret = -EAGAIN; | |
162 | goto unlock; | |
163 | } | |
164 | ||
25fd1643 | 165 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
3d6392cf JA |
166 | spin_unlock_irq(&bd->lock); |
167 | io_schedule(); | |
168 | finish_wait(&bd->wq_done, &wait); | |
169 | ||
3d6392cf JA |
170 | return ret; |
171 | unlock: | |
172 | spin_unlock_irq(&bd->lock); | |
173 | return ret; | |
174 | } | |
175 | ||
165125e1 | 176 | static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
0b07de85 | 177 | struct sg_io_v4 *hdr, struct bsg_device *bd) |
70e36ece | 178 | { |
9f5de6b1 FT |
179 | if (hdr->request_len > BLK_MAX_CDB) { |
180 | rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); | |
181 | if (!rq->cmd) | |
182 | return -ENOMEM; | |
183 | } | |
70e36ece FT |
184 | |
185 | if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, | |
186 | hdr->request_len)) | |
187 | return -EFAULT; | |
15d10b61 FT |
188 | |
189 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { | |
0b07de85 AG |
190 | if (blk_cmd_filter_verify_command(bd->cmd_filter, rq->cmd, |
191 | bd->f_mode)) | |
15d10b61 FT |
192 | return -EPERM; |
193 | } else if (!capable(CAP_SYS_RAWIO)) | |
70e36ece FT |
194 | return -EPERM; |
195 | ||
196 | /* | |
197 | * fill in request structure | |
198 | */ | |
199 | rq->cmd_len = hdr->request_len; | |
200 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
201 | ||
202 | rq->timeout = (hdr->timeout * HZ) / 1000; | |
203 | if (!rq->timeout) | |
204 | rq->timeout = q->sg_timeout; | |
205 | if (!rq->timeout) | |
206 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
3d6392cf | 211 | /* |
70e36ece | 212 | * Check if sg_io_v4 from user is allowed and valid |
3d6392cf JA |
213 | */ |
214 | static int | |
165125e1 | 215 | bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) |
3d6392cf | 216 | { |
15d10b61 FT |
217 | int ret = 0; |
218 | ||
70e36ece | 219 | if (hdr->guard != 'Q') |
3d6392cf | 220 | return -EINVAL; |
70e36ece FT |
221 | if (hdr->dout_xfer_len > (q->max_sectors << 9) || |
222 | hdr->din_xfer_len > (q->max_sectors << 9)) | |
3d6392cf JA |
223 | return -EIO; |
224 | ||
15d10b61 FT |
225 | switch (hdr->protocol) { |
226 | case BSG_PROTOCOL_SCSI: | |
227 | switch (hdr->subprotocol) { | |
228 | case BSG_SUB_PROTOCOL_SCSI_CMD: | |
229 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: | |
230 | break; | |
231 | default: | |
232 | ret = -EINVAL; | |
233 | } | |
234 | break; | |
235 | default: | |
236 | ret = -EINVAL; | |
237 | } | |
70e36ece | 238 | |
70e36ece | 239 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
15d10b61 | 240 | return ret; |
3d6392cf JA |
241 | } |
242 | ||
243 | /* | |
70e36ece | 244 | * map sg_io_v4 to a request. |
3d6392cf JA |
245 | */ |
246 | static struct request * | |
70e36ece | 247 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr) |
3d6392cf | 248 | { |
165125e1 | 249 | struct request_queue *q = bd->queue; |
2c9ecdf4 | 250 | struct request *rq, *next_rq = NULL; |
25fd1643 | 251 | int ret, rw; |
70e36ece FT |
252 | unsigned int dxfer_len; |
253 | void *dxferp = NULL; | |
3d6392cf | 254 | |
70e36ece FT |
255 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
256 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, | |
257 | hdr->din_xfer_len); | |
3d6392cf | 258 | |
70e36ece | 259 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
3d6392cf JA |
260 | if (ret) |
261 | return ERR_PTR(ret); | |
262 | ||
263 | /* | |
264 | * map scatter-gather elements seperately and string them to request | |
265 | */ | |
266 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
2c9ecdf4 FT |
267 | if (!rq) |
268 | return ERR_PTR(-ENOMEM); | |
0b07de85 | 269 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd); |
2c9ecdf4 FT |
270 | if (ret) |
271 | goto out; | |
272 | ||
273 | if (rw == WRITE && hdr->din_xfer_len) { | |
274 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { | |
275 | ret = -EOPNOTSUPP; | |
276 | goto out; | |
277 | } | |
278 | ||
279 | next_rq = blk_get_request(q, READ, GFP_KERNEL); | |
280 | if (!next_rq) { | |
281 | ret = -ENOMEM; | |
282 | goto out; | |
283 | } | |
284 | rq->next_rq = next_rq; | |
40f62028 | 285 | next_rq->cmd_type = rq->cmd_type; |
2c9ecdf4 FT |
286 | |
287 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
288 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); | |
289 | if (ret) | |
290 | goto out; | |
3d6392cf JA |
291 | } |
292 | ||
70e36ece FT |
293 | if (hdr->dout_xfer_len) { |
294 | dxfer_len = hdr->dout_xfer_len; | |
295 | dxferp = (void*)(unsigned long)hdr->dout_xferp; | |
296 | } else if (hdr->din_xfer_len) { | |
297 | dxfer_len = hdr->din_xfer_len; | |
298 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
299 | } else | |
300 | dxfer_len = 0; | |
301 | ||
302 | if (dxfer_len) { | |
303 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); | |
2c9ecdf4 FT |
304 | if (ret) |
305 | goto out; | |
3d6392cf | 306 | } |
3d6392cf | 307 | return rq; |
2c9ecdf4 | 308 | out: |
9f5de6b1 FT |
309 | if (rq->cmd != rq->__cmd) |
310 | kfree(rq->cmd); | |
2c9ecdf4 FT |
311 | blk_put_request(rq); |
312 | if (next_rq) { | |
313 | blk_rq_unmap_user(next_rq->bio); | |
314 | blk_put_request(next_rq); | |
315 | } | |
316 | return ERR_PTR(ret); | |
3d6392cf JA |
317 | } |
318 | ||
319 | /* | |
320 | * async completion call-back from the block layer, when scsi/ide/whatever | |
321 | * calls end_that_request_last() on a request | |
322 | */ | |
323 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
324 | { | |
325 | struct bsg_command *bc = rq->end_io_data; | |
326 | struct bsg_device *bd = bc->bd; | |
327 | unsigned long flags; | |
328 | ||
5309cb38 JA |
329 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
330 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
331 | |
332 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
333 | ||
334 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
335 | list_move_tail(&bc->list, &bd->done_list); |
336 | bd->done_cmds++; | |
3d6392cf | 337 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
338 | |
339 | wake_up(&bd->wq_done); | |
3d6392cf JA |
340 | } |
341 | ||
342 | /* | |
343 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
344 | * layer for io | |
345 | */ | |
165125e1 | 346 | static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
3d6392cf JA |
347 | struct bsg_command *bc, struct request *rq) |
348 | { | |
349 | rq->sense = bc->sense; | |
350 | rq->sense_len = 0; | |
351 | ||
352 | /* | |
353 | * add bc command to busy queue and submit rq for io | |
354 | */ | |
355 | bc->rq = rq; | |
356 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
357 | if (rq->next_rq) |
358 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
359 | bc->hdr.duration = jiffies; |
360 | spin_lock_irq(&bd->lock); | |
361 | list_add_tail(&bc->list, &bd->busy_list); | |
362 | spin_unlock_irq(&bd->lock); | |
363 | ||
364 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
365 | ||
366 | rq->end_io_data = bc; | |
d351af01 | 367 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
3d6392cf JA |
368 | } |
369 | ||
25fd1643 | 370 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
371 | { |
372 | struct bsg_command *bc = NULL; | |
373 | ||
374 | spin_lock_irq(&bd->lock); | |
375 | if (bd->done_cmds) { | |
43ac9e62 | 376 | bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
25fd1643 JA |
377 | list_del(&bc->list); |
378 | bd->done_cmds--; | |
3d6392cf JA |
379 | } |
380 | spin_unlock_irq(&bd->lock); | |
381 | ||
382 | return bc; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Get a finished command from the done list | |
387 | */ | |
e7d72173 | 388 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
389 | { |
390 | struct bsg_command *bc; | |
391 | int ret; | |
392 | ||
393 | do { | |
394 | bc = bsg_next_done_cmd(bd); | |
395 | if (bc) | |
396 | break; | |
397 | ||
e7d72173 FT |
398 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
399 | bc = ERR_PTR(-EAGAIN); | |
400 | break; | |
401 | } | |
402 | ||
403 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 404 | if (ret) { |
e7d72173 | 405 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
406 | break; |
407 | } | |
408 | } while (1); | |
409 | ||
410 | dprintk("%s: returning done %p\n", bd->name, bc); | |
411 | ||
412 | return bc; | |
413 | } | |
414 | ||
70e36ece | 415 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 416 | struct bio *bio, struct bio *bidi_bio) |
70e36ece FT |
417 | { |
418 | int ret = 0; | |
419 | ||
420 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); | |
421 | /* | |
422 | * fill in all the output members | |
423 | */ | |
424 | hdr->device_status = status_byte(rq->errors); | |
425 | hdr->transport_status = host_byte(rq->errors); | |
426 | hdr->driver_status = driver_byte(rq->errors); | |
427 | hdr->info = 0; | |
428 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
429 | hdr->info |= SG_INFO_CHECK; | |
70e36ece FT |
430 | hdr->response_len = 0; |
431 | ||
432 | if (rq->sense_len && hdr->response) { | |
25fd1643 JA |
433 | int len = min_t(unsigned int, hdr->max_response_len, |
434 | rq->sense_len); | |
70e36ece FT |
435 | |
436 | ret = copy_to_user((void*)(unsigned long)hdr->response, | |
437 | rq->sense, len); | |
438 | if (!ret) | |
439 | hdr->response_len = len; | |
440 | else | |
441 | ret = -EFAULT; | |
442 | } | |
443 | ||
2c9ecdf4 | 444 | if (rq->next_rq) { |
7a85f889 FT |
445 | hdr->dout_resid = rq->data_len; |
446 | hdr->din_resid = rq->next_rq->data_len; | |
2c9ecdf4 FT |
447 | blk_rq_unmap_user(bidi_bio); |
448 | blk_put_request(rq->next_rq); | |
0c6a89ba | 449 | } else if (rq_data_dir(rq) == READ) |
7a85f889 | 450 | hdr->din_resid = rq->data_len; |
0c6a89ba | 451 | else |
7a85f889 | 452 | hdr->dout_resid = rq->data_len; |
2c9ecdf4 | 453 | |
2d507a01 JB |
454 | /* |
455 | * If the request generated a negative error number, return it | |
456 | * (providing we aren't already returning an error); if it's | |
457 | * just a protocol response (i.e. non negative), that gets | |
458 | * processed above. | |
459 | */ | |
460 | if (!ret && rq->errors < 0) | |
461 | ret = rq->errors; | |
462 | ||
70e36ece | 463 | blk_rq_unmap_user(bio); |
9f5de6b1 FT |
464 | if (rq->cmd != rq->__cmd) |
465 | kfree(rq->cmd); | |
70e36ece FT |
466 | blk_put_request(rq); |
467 | ||
468 | return ret; | |
469 | } | |
470 | ||
3d6392cf JA |
471 | static int bsg_complete_all_commands(struct bsg_device *bd) |
472 | { | |
473 | struct bsg_command *bc; | |
474 | int ret, tret; | |
475 | ||
476 | dprintk("%s: entered\n", bd->name); | |
477 | ||
3d6392cf JA |
478 | /* |
479 | * wait for all commands to complete | |
480 | */ | |
481 | ret = 0; | |
482 | do { | |
25fd1643 | 483 | ret = bsg_io_schedule(bd); |
3d6392cf JA |
484 | /* |
485 | * look for -ENODATA specifically -- we'll sometimes get | |
486 | * -ERESTARTSYS when we've taken a signal, but we can't | |
487 | * return until we're done freeing the queue, so ignore | |
488 | * it. The signal will get handled when we're done freeing | |
489 | * the bsg_device. | |
490 | */ | |
491 | } while (ret != -ENODATA); | |
492 | ||
493 | /* | |
494 | * discard done commands | |
495 | */ | |
496 | ret = 0; | |
497 | do { | |
e7d72173 FT |
498 | spin_lock_irq(&bd->lock); |
499 | if (!bd->queued_cmds) { | |
500 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
501 | break; |
502 | } | |
efba1a31 | 503 | spin_unlock_irq(&bd->lock); |
3d6392cf | 504 | |
e7d72173 FT |
505 | bc = bsg_get_done_cmd(bd); |
506 | if (IS_ERR(bc)) | |
507 | break; | |
508 | ||
2c9ecdf4 FT |
509 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
510 | bc->bidi_bio); | |
3d6392cf JA |
511 | if (!ret) |
512 | ret = tret; | |
513 | ||
514 | bsg_free_command(bc); | |
515 | } while (1); | |
516 | ||
517 | return ret; | |
518 | } | |
519 | ||
25fd1643 | 520 | static int |
e7d72173 FT |
521 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
522 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
523 | { |
524 | struct bsg_command *bc; | |
525 | int nr_commands, ret; | |
526 | ||
70e36ece | 527 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
528 | return -EINVAL; |
529 | ||
530 | ret = 0; | |
70e36ece | 531 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 532 | while (nr_commands) { |
e7d72173 | 533 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
534 | if (IS_ERR(bc)) { |
535 | ret = PTR_ERR(bc); | |
536 | break; | |
537 | } | |
538 | ||
539 | /* | |
540 | * this is the only case where we need to copy data back | |
541 | * after completing the request. so do that here, | |
542 | * bsg_complete_work() cannot do that for us | |
543 | */ | |
2c9ecdf4 FT |
544 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
545 | bc->bidi_bio); | |
3d6392cf | 546 | |
25fd1643 | 547 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
548 | ret = -EFAULT; |
549 | ||
550 | bsg_free_command(bc); | |
551 | ||
552 | if (ret) | |
553 | break; | |
554 | ||
70e36ece FT |
555 | buf += sizeof(struct sg_io_v4); |
556 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
557 | nr_commands--; |
558 | } | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
563 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
564 | { | |
565 | if (file->f_flags & O_NONBLOCK) | |
566 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
567 | else | |
568 | set_bit(BSG_F_BLOCK, &bd->flags); | |
569 | } | |
570 | ||
0b07de85 AG |
571 | static void bsg_set_cmd_filter(struct bsg_device *bd, |
572 | struct file *file) | |
3d6392cf | 573 | { |
0b07de85 AG |
574 | struct inode *inode; |
575 | struct gendisk *disk; | |
576 | ||
577 | if (!file) | |
578 | return; | |
579 | ||
580 | inode = file->f_dentry->d_inode; | |
581 | if (!inode) | |
582 | return; | |
583 | ||
584 | disk = inode->i_bdev->bd_disk; | |
585 | ||
586 | bd->cmd_filter = &disk->cmd_filter; | |
587 | bd->f_mode = &file->f_mode; | |
3d6392cf JA |
588 | } |
589 | ||
25fd1643 JA |
590 | /* |
591 | * Check if the error is a "real" error that we should return. | |
592 | */ | |
3d6392cf JA |
593 | static inline int err_block_err(int ret) |
594 | { | |
595 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
596 | return 1; | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | static ssize_t | |
602 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
603 | { | |
604 | struct bsg_device *bd = file->private_data; | |
605 | int ret; | |
606 | ssize_t bytes_read; | |
607 | ||
9e69fbb5 | 608 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
3d6392cf JA |
609 | |
610 | bsg_set_block(bd, file); | |
0b07de85 AG |
611 | bsg_set_cmd_filter(bd, file); |
612 | ||
3d6392cf | 613 | bytes_read = 0; |
e7d72173 | 614 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
615 | *ppos = bytes_read; |
616 | ||
617 | if (!bytes_read || (bytes_read && err_block_err(ret))) | |
618 | bytes_read = ret; | |
619 | ||
620 | return bytes_read; | |
621 | } | |
622 | ||
25fd1643 JA |
623 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
624 | size_t count, ssize_t *bytes_written) | |
3d6392cf JA |
625 | { |
626 | struct bsg_command *bc; | |
627 | struct request *rq; | |
628 | int ret, nr_commands; | |
629 | ||
70e36ece | 630 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
631 | return -EINVAL; |
632 | ||
70e36ece | 633 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
634 | rq = NULL; |
635 | bc = NULL; | |
636 | ret = 0; | |
637 | while (nr_commands) { | |
165125e1 | 638 | struct request_queue *q = bd->queue; |
3d6392cf | 639 | |
e7d72173 | 640 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
641 | if (IS_ERR(bc)) { |
642 | ret = PTR_ERR(bc); | |
643 | bc = NULL; | |
644 | break; | |
645 | } | |
646 | ||
3d6392cf JA |
647 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
648 | ret = -EFAULT; | |
649 | break; | |
650 | } | |
651 | ||
652 | /* | |
653 | * get a request, fill in the blanks, and add to request queue | |
654 | */ | |
70e36ece | 655 | rq = bsg_map_hdr(bd, &bc->hdr); |
3d6392cf JA |
656 | if (IS_ERR(rq)) { |
657 | ret = PTR_ERR(rq); | |
658 | rq = NULL; | |
659 | break; | |
660 | } | |
661 | ||
662 | bsg_add_command(bd, q, bc, rq); | |
663 | bc = NULL; | |
664 | rq = NULL; | |
665 | nr_commands--; | |
70e36ece | 666 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 667 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
668 | } |
669 | ||
3d6392cf JA |
670 | if (bc) |
671 | bsg_free_command(bc); | |
672 | ||
673 | return ret; | |
674 | } | |
675 | ||
676 | static ssize_t | |
677 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
678 | { | |
679 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 680 | ssize_t bytes_written; |
3d6392cf JA |
681 | int ret; |
682 | ||
9e69fbb5 | 683 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
3d6392cf JA |
684 | |
685 | bsg_set_block(bd, file); | |
0b07de85 | 686 | bsg_set_cmd_filter(bd, file); |
3d6392cf | 687 | |
25fd1643 JA |
688 | bytes_written = 0; |
689 | ret = __bsg_write(bd, buf, count, &bytes_written); | |
690 | *ppos = bytes_written; | |
3d6392cf JA |
691 | |
692 | /* | |
693 | * return bytes written on non-fatal errors | |
694 | */ | |
25fd1643 JA |
695 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
696 | bytes_written = ret; | |
3d6392cf | 697 | |
25fd1643 JA |
698 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
699 | return bytes_written; | |
3d6392cf JA |
700 | } |
701 | ||
3d6392cf JA |
702 | static struct bsg_device *bsg_alloc_device(void) |
703 | { | |
3d6392cf | 704 | struct bsg_device *bd; |
3d6392cf JA |
705 | |
706 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
707 | if (unlikely(!bd)) | |
708 | return NULL; | |
709 | ||
710 | spin_lock_init(&bd->lock); | |
711 | ||
5309cb38 | 712 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
713 | |
714 | INIT_LIST_HEAD(&bd->busy_list); | |
715 | INIT_LIST_HEAD(&bd->done_list); | |
716 | INIT_HLIST_NODE(&bd->dev_list); | |
717 | ||
718 | init_waitqueue_head(&bd->wq_free); | |
719 | init_waitqueue_head(&bd->wq_done); | |
720 | return bd; | |
3d6392cf JA |
721 | } |
722 | ||
97f46ae4 FT |
723 | static void bsg_kref_release_function(struct kref *kref) |
724 | { | |
725 | struct bsg_class_device *bcd = | |
726 | container_of(kref, struct bsg_class_device, ref); | |
8df5fc04 | 727 | struct device *parent = bcd->parent; |
97f46ae4 FT |
728 | |
729 | if (bcd->release) | |
730 | bcd->release(bcd->parent); | |
731 | ||
8df5fc04 | 732 | put_device(parent); |
97f46ae4 FT |
733 | } |
734 | ||
3d6392cf JA |
735 | static int bsg_put_device(struct bsg_device *bd) |
736 | { | |
97f46ae4 FT |
737 | int ret = 0, do_free; |
738 | struct request_queue *q = bd->queue; | |
3d6392cf JA |
739 | |
740 | mutex_lock(&bsg_mutex); | |
741 | ||
97f46ae4 | 742 | do_free = atomic_dec_and_test(&bd->ref_count); |
3f27e3ed FT |
743 | if (!do_free) { |
744 | mutex_unlock(&bsg_mutex); | |
3d6392cf | 745 | goto out; |
3f27e3ed FT |
746 | } |
747 | ||
748 | hlist_del(&bd->dev_list); | |
749 | mutex_unlock(&bsg_mutex); | |
3d6392cf JA |
750 | |
751 | dprintk("%s: tearing down\n", bd->name); | |
752 | ||
753 | /* | |
754 | * close can always block | |
755 | */ | |
756 | set_bit(BSG_F_BLOCK, &bd->flags); | |
757 | ||
758 | /* | |
759 | * correct error detection baddies here again. it's the responsibility | |
760 | * of the app to properly reap commands before close() if it wants | |
761 | * fool-proof error detection | |
762 | */ | |
763 | ret = bsg_complete_all_commands(bd); | |
764 | ||
5309cb38 | 765 | kfree(bd); |
3d6392cf | 766 | out: |
97f46ae4 FT |
767 | kref_put(&q->bsg_dev.ref, bsg_kref_release_function); |
768 | if (do_free) | |
769 | blk_put_queue(q); | |
3d6392cf JA |
770 | return ret; |
771 | } | |
772 | ||
773 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 774 | struct request_queue *rq, |
3d6392cf JA |
775 | struct file *file) |
776 | { | |
25fd1643 | 777 | struct bsg_device *bd; |
c3ff1b90 | 778 | int ret; |
3d6392cf JA |
779 | #ifdef BSG_DEBUG |
780 | unsigned char buf[32]; | |
781 | #endif | |
c3ff1b90 FT |
782 | ret = blk_get_queue(rq); |
783 | if (ret) | |
784 | return ERR_PTR(-ENXIO); | |
3d6392cf JA |
785 | |
786 | bd = bsg_alloc_device(); | |
c3ff1b90 FT |
787 | if (!bd) { |
788 | blk_put_queue(rq); | |
3d6392cf | 789 | return ERR_PTR(-ENOMEM); |
c3ff1b90 | 790 | } |
3d6392cf | 791 | |
d351af01 | 792 | bd->queue = rq; |
0b07de85 | 793 | |
3d6392cf | 794 | bsg_set_block(bd, file); |
0b07de85 | 795 | bsg_set_cmd_filter(bd, file); |
3d6392cf JA |
796 | |
797 | atomic_set(&bd->ref_count, 1); | |
3d6392cf | 798 | mutex_lock(&bsg_mutex); |
842ea771 | 799 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cf | 800 | |
ee959b00 | 801 | strncpy(bd->name, rq->bsg_dev.class_dev->bus_id, sizeof(bd->name) - 1); |
3d6392cf | 802 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 803 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
804 | |
805 | mutex_unlock(&bsg_mutex); | |
806 | return bd; | |
807 | } | |
808 | ||
842ea771 | 809 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cf | 810 | { |
43ac9e62 | 811 | struct bsg_device *bd; |
3d6392cf JA |
812 | struct hlist_node *entry; |
813 | ||
814 | mutex_lock(&bsg_mutex); | |
815 | ||
43ac9e62 | 816 | hlist_for_each_entry(bd, entry, bsg_dev_idx_hash(minor), dev_list) { |
842ea771 | 817 | if (bd->queue == q) { |
3d6392cf | 818 | atomic_inc(&bd->ref_count); |
43ac9e62 | 819 | goto found; |
3d6392cf | 820 | } |
3d6392cf | 821 | } |
43ac9e62 FT |
822 | bd = NULL; |
823 | found: | |
3d6392cf JA |
824 | mutex_unlock(&bsg_mutex); |
825 | return bd; | |
826 | } | |
827 | ||
828 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
829 | { | |
598443a2 FT |
830 | struct bsg_device *bd; |
831 | struct bsg_class_device *bcd; | |
3d6392cf | 832 | |
3d6392cf JA |
833 | /* |
834 | * find the class device | |
835 | */ | |
3d6392cf | 836 | mutex_lock(&bsg_mutex); |
598443a2 | 837 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
d45ac4fa | 838 | if (bcd) |
97f46ae4 | 839 | kref_get(&bcd->ref); |
3d6392cf JA |
840 | mutex_unlock(&bsg_mutex); |
841 | ||
842 | if (!bcd) | |
843 | return ERR_PTR(-ENODEV); | |
844 | ||
842ea771 | 845 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
d45ac4fa FT |
846 | if (bd) |
847 | return bd; | |
848 | ||
849 | bd = bsg_add_device(inode, bcd->queue, file); | |
850 | if (IS_ERR(bd)) | |
97f46ae4 | 851 | kref_put(&bcd->ref, bsg_kref_release_function); |
d45ac4fa FT |
852 | |
853 | return bd; | |
3d6392cf JA |
854 | } |
855 | ||
856 | static int bsg_open(struct inode *inode, struct file *file) | |
857 | { | |
75bd2ef1 JC |
858 | struct bsg_device *bd; |
859 | ||
860 | lock_kernel(); | |
861 | bd = bsg_get_device(inode, file); | |
862 | unlock_kernel(); | |
3d6392cf JA |
863 | |
864 | if (IS_ERR(bd)) | |
865 | return PTR_ERR(bd); | |
866 | ||
867 | file->private_data = bd; | |
868 | return 0; | |
869 | } | |
870 | ||
871 | static int bsg_release(struct inode *inode, struct file *file) | |
872 | { | |
873 | struct bsg_device *bd = file->private_data; | |
874 | ||
875 | file->private_data = NULL; | |
876 | return bsg_put_device(bd); | |
877 | } | |
878 | ||
879 | static unsigned int bsg_poll(struct file *file, poll_table *wait) | |
880 | { | |
881 | struct bsg_device *bd = file->private_data; | |
882 | unsigned int mask = 0; | |
883 | ||
884 | poll_wait(file, &bd->wq_done, wait); | |
885 | poll_wait(file, &bd->wq_free, wait); | |
886 | ||
887 | spin_lock_irq(&bd->lock); | |
888 | if (!list_empty(&bd->done_list)) | |
889 | mask |= POLLIN | POLLRDNORM; | |
890 | if (bd->queued_cmds >= bd->max_queue) | |
891 | mask |= POLLOUT; | |
892 | spin_unlock_irq(&bd->lock); | |
893 | ||
894 | return mask; | |
895 | } | |
896 | ||
25fd1643 | 897 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
898 | { |
899 | struct bsg_device *bd = file->private_data; | |
900 | int __user *uarg = (int __user *) arg; | |
2d507a01 | 901 | int ret; |
3d6392cf | 902 | |
3d6392cf JA |
903 | switch (cmd) { |
904 | /* | |
905 | * our own ioctls | |
906 | */ | |
907 | case SG_GET_COMMAND_Q: | |
908 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 909 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
910 | int queue; |
911 | ||
912 | if (get_user(queue, uarg)) | |
913 | return -EFAULT; | |
5309cb38 | 914 | if (queue < 1) |
3d6392cf JA |
915 | return -EINVAL; |
916 | ||
5309cb38 | 917 | spin_lock_irq(&bd->lock); |
3d6392cf | 918 | bd->max_queue = queue; |
5309cb38 | 919 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
920 | return 0; |
921 | } | |
922 | ||
923 | /* | |
924 | * SCSI/sg ioctls | |
925 | */ | |
926 | case SG_GET_VERSION_NUM: | |
927 | case SCSI_IOCTL_GET_IDLUN: | |
928 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
929 | case SG_SET_TIMEOUT: | |
930 | case SG_GET_TIMEOUT: | |
931 | case SG_GET_RESERVED_SIZE: | |
932 | case SG_SET_RESERVED_SIZE: | |
933 | case SG_EMULATED_HOST: | |
3d6392cf JA |
934 | case SCSI_IOCTL_SEND_COMMAND: { |
935 | void __user *uarg = (void __user *) arg; | |
d351af01 | 936 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
3d6392cf | 937 | } |
10e8855b FT |
938 | case SG_IO: { |
939 | struct request *rq; | |
2c9ecdf4 | 940 | struct bio *bio, *bidi_bio = NULL; |
10e8855b FT |
941 | struct sg_io_v4 hdr; |
942 | ||
943 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
944 | return -EFAULT; | |
945 | ||
946 | rq = bsg_map_hdr(bd, &hdr); | |
947 | if (IS_ERR(rq)) | |
948 | return PTR_ERR(rq); | |
949 | ||
950 | bio = rq->bio; | |
2c9ecdf4 FT |
951 | if (rq->next_rq) |
952 | bidi_bio = rq->next_rq->bio; | |
d351af01 | 953 | blk_execute_rq(bd->queue, NULL, rq, 0); |
2d507a01 | 954 | ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
955 | |
956 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
957 | return -EFAULT; | |
b711afa6 | 958 | |
2d507a01 | 959 | return ret; |
10e8855b | 960 | } |
3d6392cf JA |
961 | /* |
962 | * block device ioctls | |
963 | */ | |
964 | default: | |
965 | #if 0 | |
966 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
967 | #else | |
968 | return -ENOTTY; | |
969 | #endif | |
970 | } | |
971 | } | |
972 | ||
7344be05 | 973 | static const struct file_operations bsg_fops = { |
3d6392cf JA |
974 | .read = bsg_read, |
975 | .write = bsg_write, | |
976 | .poll = bsg_poll, | |
977 | .open = bsg_open, | |
978 | .release = bsg_release, | |
25fd1643 | 979 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf JA |
980 | .owner = THIS_MODULE, |
981 | }; | |
982 | ||
d351af01 | 983 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 984 | { |
d351af01 | 985 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 986 | |
df468820 FT |
987 | if (!bcd->class_dev) |
988 | return; | |
3d6392cf JA |
989 | |
990 | mutex_lock(&bsg_mutex); | |
598443a2 | 991 | idr_remove(&bsg_minor_idr, bcd->minor); |
d351af01 | 992 | sysfs_remove_link(&q->kobj, "bsg"); |
ee959b00 | 993 | device_unregister(bcd->class_dev); |
3d6392cf | 994 | bcd->class_dev = NULL; |
97f46ae4 | 995 | kref_put(&bcd->ref, bsg_kref_release_function); |
3d6392cf JA |
996 | mutex_unlock(&bsg_mutex); |
997 | } | |
4cf0723a | 998 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 999 | |
97f46ae4 FT |
1000 | int bsg_register_queue(struct request_queue *q, struct device *parent, |
1001 | const char *name, void (*release)(struct device *)) | |
3d6392cf | 1002 | { |
598443a2 | 1003 | struct bsg_class_device *bcd; |
3d6392cf | 1004 | dev_t dev; |
598443a2 | 1005 | int ret, minor; |
ee959b00 | 1006 | struct device *class_dev = NULL; |
39dca558 JB |
1007 | const char *devname; |
1008 | ||
1009 | if (name) | |
1010 | devname = name; | |
1011 | else | |
97f46ae4 | 1012 | devname = parent->bus_id; |
3d6392cf JA |
1013 | |
1014 | /* | |
1015 | * we need a proper transport to send commands, not a stacked device | |
1016 | */ | |
1017 | if (!q->request_fn) | |
1018 | return 0; | |
1019 | ||
d351af01 | 1020 | bcd = &q->bsg_dev; |
3d6392cf | 1021 | memset(bcd, 0, sizeof(*bcd)); |
3d6392cf JA |
1022 | |
1023 | mutex_lock(&bsg_mutex); | |
292b7f27 | 1024 | |
598443a2 FT |
1025 | ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL); |
1026 | if (!ret) { | |
1027 | ret = -ENOMEM; | |
1028 | goto unlock; | |
292b7f27 FT |
1029 | } |
1030 | ||
598443a2 FT |
1031 | ret = idr_get_new(&bsg_minor_idr, bcd, &minor); |
1032 | if (ret < 0) | |
1033 | goto unlock; | |
292b7f27 | 1034 | |
598443a2 FT |
1035 | if (minor >= BSG_MAX_DEVS) { |
1036 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
1037 | ret = -EINVAL; | |
1038 | goto remove_idr; | |
1039 | } | |
1040 | ||
1041 | bcd->minor = minor; | |
d351af01 | 1042 | bcd->queue = q; |
97f46ae4 FT |
1043 | bcd->parent = get_device(parent); |
1044 | bcd->release = release; | |
1045 | kref_init(&bcd->ref); | |
46f6ef4a | 1046 | dev = MKDEV(bsg_major, bcd->minor); |
f79f0605 GKH |
1047 | class_dev = device_create_drvdata(bsg_class, parent, dev, NULL, |
1048 | "%s", devname); | |
4e2872d6 FT |
1049 | if (IS_ERR(class_dev)) { |
1050 | ret = PTR_ERR(class_dev); | |
598443a2 | 1051 | goto put_dev; |
4e2872d6 FT |
1052 | } |
1053 | bcd->class_dev = class_dev; | |
1054 | ||
abce891a | 1055 | if (q->kobj.sd) { |
4e2872d6 FT |
1056 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
1057 | if (ret) | |
598443a2 | 1058 | goto unregister_class_dev; |
4e2872d6 FT |
1059 | } |
1060 | ||
3d6392cf JA |
1061 | mutex_unlock(&bsg_mutex); |
1062 | return 0; | |
6826ee4f | 1063 | |
598443a2 | 1064 | unregister_class_dev: |
ee959b00 | 1065 | device_unregister(class_dev); |
598443a2 | 1066 | put_dev: |
97f46ae4 | 1067 | put_device(parent); |
598443a2 FT |
1068 | remove_idr: |
1069 | idr_remove(&bsg_minor_idr, minor); | |
1070 | unlock: | |
264a0472 | 1071 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
1072 | return ret; |
1073 | } | |
4cf0723a | 1074 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 | 1075 | |
7e7654a9 | 1076 | static struct cdev bsg_cdev; |
292b7f27 | 1077 | |
3d6392cf JA |
1078 | static int __init bsg_init(void) |
1079 | { | |
1080 | int ret, i; | |
46f6ef4a | 1081 | dev_t devid; |
3d6392cf | 1082 | |
5309cb38 | 1083 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83 | 1084 | sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38 JA |
1085 | if (!bsg_cmd_cachep) { |
1086 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1087 | return -ENOMEM; | |
1088 | } | |
1089 | ||
25fd1643 | 1090 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1091 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1092 | ||
1093 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 | 1094 | if (IS_ERR(bsg_class)) { |
9b9f770c FT |
1095 | ret = PTR_ERR(bsg_class); |
1096 | goto destroy_kmemcache; | |
5309cb38 | 1097 | } |
3d6392cf | 1098 | |
46f6ef4a | 1099 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
1100 | if (ret) |
1101 | goto destroy_bsg_class; | |
292b7f27 | 1102 | |
46f6ef4a JA |
1103 | bsg_major = MAJOR(devid); |
1104 | ||
292b7f27 | 1105 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 1106 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
1107 | if (ret) |
1108 | goto unregister_chrdev; | |
3d6392cf | 1109 | |
5d3a8cd3 | 1110 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 1111 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 1112 | return 0; |
9b9f770c FT |
1113 | unregister_chrdev: |
1114 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
1115 | destroy_bsg_class: | |
1116 | class_destroy(bsg_class); | |
1117 | destroy_kmemcache: | |
1118 | kmem_cache_destroy(bsg_cmd_cachep); | |
1119 | return ret; | |
3d6392cf JA |
1120 | } |
1121 | ||
1122 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 1123 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
1124 | MODULE_LICENSE("GPL"); |
1125 | ||
4e2872d6 | 1126 | device_initcall(bsg_init); |