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