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Commit | Line | Data |
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3d6392cf | 1 | /* |
0c6a89ba | 2 | * bsg.c - block layer implementation of the sg v4 interface |
3d6392cf JA |
3 | * |
4 | * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs | |
5 | * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com> | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General Public | |
8 | * License version 2. See the file "COPYING" in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | */ | |
3d6392cf JA |
12 | #include <linux/module.h> |
13 | #include <linux/init.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/blkdev.h> | |
16 | #include <linux/poll.h> | |
17 | #include <linux/cdev.h> | |
18 | #include <linux/percpu.h> | |
19 | #include <linux/uio.h> | |
598443a2 | 20 | #include <linux/idr.h> |
3d6392cf | 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, | |
3d6392cf JA |
52 | }; |
53 | ||
5309cb38 | 54 | #define BSG_DEFAULT_CMDS 64 |
292b7f27 | 55 | #define BSG_MAX_DEVS 32768 |
3d6392cf JA |
56 | |
57 | #undef BSG_DEBUG | |
58 | ||
59 | #ifdef BSG_DEBUG | |
24c03d47 | 60 | #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args) |
3d6392cf JA |
61 | #else |
62 | #define dprintk(fmt, args...) | |
63 | #endif | |
64 | ||
3d6392cf | 65 | static DEFINE_MUTEX(bsg_mutex); |
598443a2 | 66 | static DEFINE_IDR(bsg_minor_idr); |
3d6392cf | 67 | |
25fd1643 | 68 | #define BSG_LIST_ARRAY_SIZE 8 |
25fd1643 | 69 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
3d6392cf JA |
70 | |
71 | static struct class *bsg_class; | |
46f6ef4a | 72 | static int bsg_major; |
3d6392cf | 73 | |
5309cb38 JA |
74 | static struct kmem_cache *bsg_cmd_cachep; |
75 | ||
3d6392cf JA |
76 | /* |
77 | * our internal command type | |
78 | */ | |
79 | struct bsg_command { | |
80 | struct bsg_device *bd; | |
81 | struct list_head list; | |
82 | struct request *rq; | |
83 | struct bio *bio; | |
2c9ecdf4 | 84 | struct bio *bidi_bio; |
3d6392cf | 85 | int err; |
70e36ece | 86 | struct sg_io_v4 hdr; |
3d6392cf JA |
87 | char sense[SCSI_SENSE_BUFFERSIZE]; |
88 | }; | |
89 | ||
90 | static void bsg_free_command(struct bsg_command *bc) | |
91 | { | |
92 | struct bsg_device *bd = bc->bd; | |
3d6392cf JA |
93 | unsigned long flags; |
94 | ||
5309cb38 | 95 | kmem_cache_free(bsg_cmd_cachep, bc); |
3d6392cf JA |
96 | |
97 | spin_lock_irqsave(&bd->lock, flags); | |
98 | bd->queued_cmds--; | |
3d6392cf JA |
99 | spin_unlock_irqrestore(&bd->lock, flags); |
100 | ||
101 | wake_up(&bd->wq_free); | |
102 | } | |
103 | ||
e7d72173 | 104 | static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
3d6392cf | 105 | { |
e7d72173 | 106 | struct bsg_command *bc = ERR_PTR(-EINVAL); |
3d6392cf JA |
107 | |
108 | spin_lock_irq(&bd->lock); | |
109 | ||
110 | if (bd->queued_cmds >= bd->max_queue) | |
111 | goto out; | |
112 | ||
3d6392cf | 113 | bd->queued_cmds++; |
3d6392cf JA |
114 | spin_unlock_irq(&bd->lock); |
115 | ||
25fd1643 | 116 | bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
5309cb38 JA |
117 | if (unlikely(!bc)) { |
118 | spin_lock_irq(&bd->lock); | |
7e75d730 | 119 | bd->queued_cmds--; |
e7d72173 | 120 | bc = ERR_PTR(-ENOMEM); |
7e75d730 | 121 | goto out; |
5309cb38 JA |
122 | } |
123 | ||
3d6392cf JA |
124 | bc->bd = bd; |
125 | INIT_LIST_HEAD(&bc->list); | |
5309cb38 | 126 | dprintk("%s: returning free cmd %p\n", bd->name, bc); |
3d6392cf JA |
127 | return bc; |
128 | out: | |
3d6392cf JA |
129 | spin_unlock_irq(&bd->lock); |
130 | return bc; | |
131 | } | |
132 | ||
1c1133e1 | 133 | static inline struct hlist_head *bsg_dev_idx_hash(int index) |
3d6392cf | 134 | { |
1c1133e1 | 135 | return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cf JA |
136 | } |
137 | ||
25fd1643 | 138 | static int bsg_io_schedule(struct bsg_device *bd) |
3d6392cf JA |
139 | { |
140 | DEFINE_WAIT(wait); | |
141 | int ret = 0; | |
142 | ||
143 | spin_lock_irq(&bd->lock); | |
144 | ||
145 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
146 | ||
147 | /* | |
148 | * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no | |
149 | * work to do", even though we return -ENOSPC after this same test | |
150 | * during bsg_write() -- there, it means our buffer can't have more | |
151 | * bsg_commands added to it, thus has no space left. | |
152 | */ | |
153 | if (bd->done_cmds == bd->queued_cmds) { | |
154 | ret = -ENODATA; | |
155 | goto unlock; | |
156 | } | |
157 | ||
158 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { | |
159 | ret = -EAGAIN; | |
160 | goto unlock; | |
161 | } | |
162 | ||
25fd1643 | 163 | prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
3d6392cf JA |
164 | spin_unlock_irq(&bd->lock); |
165 | io_schedule(); | |
166 | finish_wait(&bd->wq_done, &wait); | |
167 | ||
3d6392cf JA |
168 | return ret; |
169 | unlock: | |
170 | spin_unlock_irq(&bd->lock); | |
171 | return ret; | |
172 | } | |
173 | ||
165125e1 | 174 | static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
abf54393 FT |
175 | struct sg_io_v4 *hdr, struct bsg_device *bd, |
176 | int has_write_perm) | |
70e36ece | 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) { | |
abf54393 | 189 | if (blk_verify_command(&q->cmd_filter, rq->cmd, has_write_perm)) |
15d10b61 FT |
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 * | |
abf54393 | 245 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, int has_write_perm) |
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); | |
abf54393 | 267 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); |
2c9ecdf4 FT |
268 | if (ret) |
269 | goto out; | |
270 | ||
271 | if (rw == WRITE && hdr->din_xfer_len) { | |
272 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { | |
273 | ret = -EOPNOTSUPP; | |
274 | goto out; | |
275 | } | |
276 | ||
277 | next_rq = blk_get_request(q, READ, GFP_KERNEL); | |
278 | if (!next_rq) { | |
279 | ret = -ENOMEM; | |
280 | goto out; | |
281 | } | |
282 | rq->next_rq = next_rq; | |
40f62028 | 283 | next_rq->cmd_type = rq->cmd_type; |
2c9ecdf4 FT |
284 | |
285 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
286 | ret = blk_rq_map_user(q, next_rq, dxferp, hdr->din_xfer_len); | |
287 | if (ret) | |
288 | goto out; | |
3d6392cf JA |
289 | } |
290 | ||
70e36ece FT |
291 | if (hdr->dout_xfer_len) { |
292 | dxfer_len = hdr->dout_xfer_len; | |
293 | dxferp = (void*)(unsigned long)hdr->dout_xferp; | |
294 | } else if (hdr->din_xfer_len) { | |
295 | dxfer_len = hdr->din_xfer_len; | |
296 | dxferp = (void*)(unsigned long)hdr->din_xferp; | |
297 | } else | |
298 | dxfer_len = 0; | |
299 | ||
300 | if (dxfer_len) { | |
301 | ret = blk_rq_map_user(q, rq, dxferp, dxfer_len); | |
2c9ecdf4 FT |
302 | if (ret) |
303 | goto out; | |
3d6392cf | 304 | } |
3d6392cf | 305 | return rq; |
2c9ecdf4 | 306 | out: |
9f5de6b1 FT |
307 | if (rq->cmd != rq->__cmd) |
308 | kfree(rq->cmd); | |
2c9ecdf4 FT |
309 | blk_put_request(rq); |
310 | if (next_rq) { | |
311 | blk_rq_unmap_user(next_rq->bio); | |
312 | blk_put_request(next_rq); | |
313 | } | |
314 | return ERR_PTR(ret); | |
3d6392cf JA |
315 | } |
316 | ||
317 | /* | |
318 | * async completion call-back from the block layer, when scsi/ide/whatever | |
319 | * calls end_that_request_last() on a request | |
320 | */ | |
321 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
322 | { | |
323 | struct bsg_command *bc = rq->end_io_data; | |
324 | struct bsg_device *bd = bc->bd; | |
325 | unsigned long flags; | |
326 | ||
5309cb38 JA |
327 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
328 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
329 | |
330 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
331 | ||
332 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
333 | list_move_tail(&bc->list, &bd->done_list); |
334 | bd->done_cmds++; | |
3d6392cf | 335 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
336 | |
337 | wake_up(&bd->wq_done); | |
3d6392cf JA |
338 | } |
339 | ||
340 | /* | |
341 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
342 | * layer for io | |
343 | */ | |
165125e1 | 344 | static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
3d6392cf JA |
345 | struct bsg_command *bc, struct request *rq) |
346 | { | |
347 | rq->sense = bc->sense; | |
348 | rq->sense_len = 0; | |
349 | ||
350 | /* | |
351 | * add bc command to busy queue and submit rq for io | |
352 | */ | |
353 | bc->rq = rq; | |
354 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
355 | if (rq->next_rq) |
356 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
357 | bc->hdr.duration = jiffies; |
358 | spin_lock_irq(&bd->lock); | |
359 | list_add_tail(&bc->list, &bd->busy_list); | |
360 | spin_unlock_irq(&bd->lock); | |
361 | ||
362 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
363 | ||
364 | rq->end_io_data = bc; | |
d351af01 | 365 | blk_execute_rq_nowait(q, NULL, rq, 1, bsg_rq_end_io); |
3d6392cf JA |
366 | } |
367 | ||
25fd1643 | 368 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
369 | { |
370 | struct bsg_command *bc = NULL; | |
371 | ||
372 | spin_lock_irq(&bd->lock); | |
373 | if (bd->done_cmds) { | |
43ac9e62 | 374 | bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
25fd1643 JA |
375 | list_del(&bc->list); |
376 | bd->done_cmds--; | |
3d6392cf JA |
377 | } |
378 | spin_unlock_irq(&bd->lock); | |
379 | ||
380 | return bc; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Get a finished command from the done list | |
385 | */ | |
e7d72173 | 386 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
387 | { |
388 | struct bsg_command *bc; | |
389 | int ret; | |
390 | ||
391 | do { | |
392 | bc = bsg_next_done_cmd(bd); | |
393 | if (bc) | |
394 | break; | |
395 | ||
e7d72173 FT |
396 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
397 | bc = ERR_PTR(-EAGAIN); | |
398 | break; | |
399 | } | |
400 | ||
401 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 402 | if (ret) { |
e7d72173 | 403 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
404 | break; |
405 | } | |
406 | } while (1); | |
407 | ||
408 | dprintk("%s: returning done %p\n", bd->name, bc); | |
409 | ||
410 | return bc; | |
411 | } | |
412 | ||
70e36ece | 413 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 414 | struct bio *bio, struct bio *bidi_bio) |
70e36ece FT |
415 | { |
416 | int ret = 0; | |
417 | ||
418 | dprintk("rq %p bio %p %u\n", rq, bio, rq->errors); | |
419 | /* | |
420 | * fill in all the output members | |
421 | */ | |
422 | hdr->device_status = status_byte(rq->errors); | |
423 | hdr->transport_status = host_byte(rq->errors); | |
424 | hdr->driver_status = driver_byte(rq->errors); | |
425 | hdr->info = 0; | |
426 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
427 | hdr->info |= SG_INFO_CHECK; | |
70e36ece FT |
428 | hdr->response_len = 0; |
429 | ||
430 | if (rq->sense_len && hdr->response) { | |
25fd1643 JA |
431 | int len = min_t(unsigned int, hdr->max_response_len, |
432 | rq->sense_len); | |
70e36ece FT |
433 | |
434 | ret = copy_to_user((void*)(unsigned long)hdr->response, | |
435 | rq->sense, len); | |
436 | if (!ret) | |
437 | hdr->response_len = len; | |
438 | else | |
439 | ret = -EFAULT; | |
440 | } | |
441 | ||
2c9ecdf4 | 442 | if (rq->next_rq) { |
7a85f889 FT |
443 | hdr->dout_resid = rq->data_len; |
444 | hdr->din_resid = rq->next_rq->data_len; | |
2c9ecdf4 FT |
445 | blk_rq_unmap_user(bidi_bio); |
446 | blk_put_request(rq->next_rq); | |
0c6a89ba | 447 | } else if (rq_data_dir(rq) == READ) |
7a85f889 | 448 | hdr->din_resid = rq->data_len; |
0c6a89ba | 449 | else |
7a85f889 | 450 | hdr->dout_resid = rq->data_len; |
2c9ecdf4 | 451 | |
2d507a01 JB |
452 | /* |
453 | * If the request generated a negative error number, return it | |
454 | * (providing we aren't already returning an error); if it's | |
455 | * just a protocol response (i.e. non negative), that gets | |
456 | * processed above. | |
457 | */ | |
458 | if (!ret && rq->errors < 0) | |
459 | ret = rq->errors; | |
460 | ||
70e36ece | 461 | blk_rq_unmap_user(bio); |
9f5de6b1 FT |
462 | if (rq->cmd != rq->__cmd) |
463 | kfree(rq->cmd); | |
70e36ece FT |
464 | blk_put_request(rq); |
465 | ||
466 | return ret; | |
467 | } | |
468 | ||
3d6392cf JA |
469 | static int bsg_complete_all_commands(struct bsg_device *bd) |
470 | { | |
471 | struct bsg_command *bc; | |
472 | int ret, tret; | |
473 | ||
474 | dprintk("%s: entered\n", bd->name); | |
475 | ||
3d6392cf JA |
476 | /* |
477 | * wait for all commands to complete | |
478 | */ | |
479 | ret = 0; | |
480 | do { | |
25fd1643 | 481 | ret = bsg_io_schedule(bd); |
3d6392cf JA |
482 | /* |
483 | * look for -ENODATA specifically -- we'll sometimes get | |
484 | * -ERESTARTSYS when we've taken a signal, but we can't | |
485 | * return until we're done freeing the queue, so ignore | |
486 | * it. The signal will get handled when we're done freeing | |
487 | * the bsg_device. | |
488 | */ | |
489 | } while (ret != -ENODATA); | |
490 | ||
491 | /* | |
492 | * discard done commands | |
493 | */ | |
494 | ret = 0; | |
495 | do { | |
e7d72173 FT |
496 | spin_lock_irq(&bd->lock); |
497 | if (!bd->queued_cmds) { | |
498 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
499 | break; |
500 | } | |
efba1a31 | 501 | spin_unlock_irq(&bd->lock); |
3d6392cf | 502 | |
e7d72173 FT |
503 | bc = bsg_get_done_cmd(bd); |
504 | if (IS_ERR(bc)) | |
505 | break; | |
506 | ||
2c9ecdf4 FT |
507 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
508 | bc->bidi_bio); | |
3d6392cf JA |
509 | if (!ret) |
510 | ret = tret; | |
511 | ||
512 | bsg_free_command(bc); | |
513 | } while (1); | |
514 | ||
515 | return ret; | |
516 | } | |
517 | ||
25fd1643 | 518 | static int |
e7d72173 FT |
519 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
520 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
521 | { |
522 | struct bsg_command *bc; | |
523 | int nr_commands, ret; | |
524 | ||
70e36ece | 525 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
526 | return -EINVAL; |
527 | ||
528 | ret = 0; | |
70e36ece | 529 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 530 | while (nr_commands) { |
e7d72173 | 531 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
532 | if (IS_ERR(bc)) { |
533 | ret = PTR_ERR(bc); | |
534 | break; | |
535 | } | |
536 | ||
537 | /* | |
538 | * this is the only case where we need to copy data back | |
539 | * after completing the request. so do that here, | |
540 | * bsg_complete_work() cannot do that for us | |
541 | */ | |
2c9ecdf4 FT |
542 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
543 | bc->bidi_bio); | |
3d6392cf | 544 | |
25fd1643 | 545 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
546 | ret = -EFAULT; |
547 | ||
548 | bsg_free_command(bc); | |
549 | ||
550 | if (ret) | |
551 | break; | |
552 | ||
70e36ece FT |
553 | buf += sizeof(struct sg_io_v4); |
554 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
555 | nr_commands--; |
556 | } | |
557 | ||
558 | return ret; | |
559 | } | |
560 | ||
561 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
562 | { | |
563 | if (file->f_flags & O_NONBLOCK) | |
564 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
565 | else | |
566 | set_bit(BSG_F_BLOCK, &bd->flags); | |
567 | } | |
568 | ||
25fd1643 JA |
569 | /* |
570 | * Check if the error is a "real" error that we should return. | |
571 | */ | |
3d6392cf JA |
572 | static inline int err_block_err(int ret) |
573 | { | |
574 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
575 | return 1; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
580 | static ssize_t | |
581 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
582 | { | |
583 | struct bsg_device *bd = file->private_data; | |
584 | int ret; | |
585 | ssize_t bytes_read; | |
586 | ||
9e69fbb5 | 587 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
3d6392cf JA |
588 | |
589 | bsg_set_block(bd, file); | |
0b07de85 | 590 | |
3d6392cf | 591 | bytes_read = 0; |
e7d72173 | 592 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
593 | *ppos = bytes_read; |
594 | ||
595 | if (!bytes_read || (bytes_read && err_block_err(ret))) | |
596 | bytes_read = ret; | |
597 | ||
598 | return bytes_read; | |
599 | } | |
600 | ||
25fd1643 | 601 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
abf54393 | 602 | size_t count, ssize_t *bytes_written, int has_write_perm) |
3d6392cf JA |
603 | { |
604 | struct bsg_command *bc; | |
605 | struct request *rq; | |
606 | int ret, nr_commands; | |
607 | ||
70e36ece | 608 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
609 | return -EINVAL; |
610 | ||
70e36ece | 611 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
612 | rq = NULL; |
613 | bc = NULL; | |
614 | ret = 0; | |
615 | while (nr_commands) { | |
165125e1 | 616 | struct request_queue *q = bd->queue; |
3d6392cf | 617 | |
e7d72173 | 618 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
619 | if (IS_ERR(bc)) { |
620 | ret = PTR_ERR(bc); | |
621 | bc = NULL; | |
622 | break; | |
623 | } | |
624 | ||
3d6392cf JA |
625 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
626 | ret = -EFAULT; | |
627 | break; | |
628 | } | |
629 | ||
630 | /* | |
631 | * get a request, fill in the blanks, and add to request queue | |
632 | */ | |
abf54393 | 633 | rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm); |
3d6392cf JA |
634 | if (IS_ERR(rq)) { |
635 | ret = PTR_ERR(rq); | |
636 | rq = NULL; | |
637 | break; | |
638 | } | |
639 | ||
640 | bsg_add_command(bd, q, bc, rq); | |
641 | bc = NULL; | |
642 | rq = NULL; | |
643 | nr_commands--; | |
70e36ece | 644 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 645 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
646 | } |
647 | ||
3d6392cf JA |
648 | if (bc) |
649 | bsg_free_command(bc); | |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
654 | static ssize_t | |
655 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
656 | { | |
657 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 658 | ssize_t bytes_written; |
3d6392cf JA |
659 | int ret; |
660 | ||
9e69fbb5 | 661 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
3d6392cf JA |
662 | |
663 | bsg_set_block(bd, file); | |
3d6392cf | 664 | |
25fd1643 | 665 | bytes_written = 0; |
abf54393 FT |
666 | ret = __bsg_write(bd, buf, count, &bytes_written, |
667 | file->f_mode & FMODE_WRITE); | |
668 | ||
25fd1643 | 669 | *ppos = bytes_written; |
3d6392cf JA |
670 | |
671 | /* | |
672 | * return bytes written on non-fatal errors | |
673 | */ | |
25fd1643 JA |
674 | if (!bytes_written || (bytes_written && err_block_err(ret))) |
675 | bytes_written = ret; | |
3d6392cf | 676 | |
25fd1643 JA |
677 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
678 | return bytes_written; | |
3d6392cf JA |
679 | } |
680 | ||
3d6392cf JA |
681 | static struct bsg_device *bsg_alloc_device(void) |
682 | { | |
3d6392cf | 683 | struct bsg_device *bd; |
3d6392cf JA |
684 | |
685 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
686 | if (unlikely(!bd)) | |
687 | return NULL; | |
688 | ||
689 | spin_lock_init(&bd->lock); | |
690 | ||
5309cb38 | 691 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
692 | |
693 | INIT_LIST_HEAD(&bd->busy_list); | |
694 | INIT_LIST_HEAD(&bd->done_list); | |
695 | INIT_HLIST_NODE(&bd->dev_list); | |
696 | ||
697 | init_waitqueue_head(&bd->wq_free); | |
698 | init_waitqueue_head(&bd->wq_done); | |
699 | return bd; | |
3d6392cf JA |
700 | } |
701 | ||
97f46ae4 FT |
702 | static void bsg_kref_release_function(struct kref *kref) |
703 | { | |
704 | struct bsg_class_device *bcd = | |
705 | container_of(kref, struct bsg_class_device, ref); | |
8df5fc04 | 706 | struct device *parent = bcd->parent; |
97f46ae4 FT |
707 | |
708 | if (bcd->release) | |
709 | bcd->release(bcd->parent); | |
710 | ||
8df5fc04 | 711 | put_device(parent); |
97f46ae4 FT |
712 | } |
713 | ||
3d6392cf JA |
714 | static int bsg_put_device(struct bsg_device *bd) |
715 | { | |
97f46ae4 FT |
716 | int ret = 0, do_free; |
717 | struct request_queue *q = bd->queue; | |
3d6392cf JA |
718 | |
719 | mutex_lock(&bsg_mutex); | |
720 | ||
97f46ae4 | 721 | do_free = atomic_dec_and_test(&bd->ref_count); |
3f27e3ed FT |
722 | if (!do_free) { |
723 | mutex_unlock(&bsg_mutex); | |
3d6392cf | 724 | goto out; |
3f27e3ed FT |
725 | } |
726 | ||
727 | hlist_del(&bd->dev_list); | |
728 | mutex_unlock(&bsg_mutex); | |
3d6392cf JA |
729 | |
730 | dprintk("%s: tearing down\n", bd->name); | |
731 | ||
732 | /* | |
733 | * close can always block | |
734 | */ | |
735 | set_bit(BSG_F_BLOCK, &bd->flags); | |
736 | ||
737 | /* | |
738 | * correct error detection baddies here again. it's the responsibility | |
739 | * of the app to properly reap commands before close() if it wants | |
740 | * fool-proof error detection | |
741 | */ | |
742 | ret = bsg_complete_all_commands(bd); | |
743 | ||
5309cb38 | 744 | kfree(bd); |
3d6392cf | 745 | out: |
97f46ae4 FT |
746 | kref_put(&q->bsg_dev.ref, bsg_kref_release_function); |
747 | if (do_free) | |
748 | blk_put_queue(q); | |
3d6392cf JA |
749 | return ret; |
750 | } | |
751 | ||
752 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 753 | struct request_queue *rq, |
3d6392cf JA |
754 | struct file *file) |
755 | { | |
25fd1643 | 756 | struct bsg_device *bd; |
c3ff1b90 | 757 | int ret; |
3d6392cf JA |
758 | #ifdef BSG_DEBUG |
759 | unsigned char buf[32]; | |
760 | #endif | |
c3ff1b90 FT |
761 | ret = blk_get_queue(rq); |
762 | if (ret) | |
763 | return ERR_PTR(-ENXIO); | |
3d6392cf JA |
764 | |
765 | bd = bsg_alloc_device(); | |
c3ff1b90 FT |
766 | if (!bd) { |
767 | blk_put_queue(rq); | |
3d6392cf | 768 | return ERR_PTR(-ENOMEM); |
c3ff1b90 | 769 | } |
3d6392cf | 770 | |
d351af01 | 771 | bd->queue = rq; |
0b07de85 | 772 | |
3d6392cf JA |
773 | bsg_set_block(bd, file); |
774 | ||
775 | atomic_set(&bd->ref_count, 1); | |
3d6392cf | 776 | mutex_lock(&bsg_mutex); |
842ea771 | 777 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cf | 778 | |
ee959b00 | 779 | strncpy(bd->name, rq->bsg_dev.class_dev->bus_id, sizeof(bd->name) - 1); |
3d6392cf | 780 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 781 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
782 | |
783 | mutex_unlock(&bsg_mutex); | |
784 | return bd; | |
785 | } | |
786 | ||
842ea771 | 787 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cf | 788 | { |
43ac9e62 | 789 | struct bsg_device *bd; |
3d6392cf JA |
790 | struct hlist_node *entry; |
791 | ||
792 | mutex_lock(&bsg_mutex); | |
793 | ||
43ac9e62 | 794 | hlist_for_each_entry(bd, entry, bsg_dev_idx_hash(minor), dev_list) { |
842ea771 | 795 | if (bd->queue == q) { |
3d6392cf | 796 | atomic_inc(&bd->ref_count); |
43ac9e62 | 797 | goto found; |
3d6392cf | 798 | } |
3d6392cf | 799 | } |
43ac9e62 FT |
800 | bd = NULL; |
801 | found: | |
3d6392cf JA |
802 | mutex_unlock(&bsg_mutex); |
803 | return bd; | |
804 | } | |
805 | ||
806 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
807 | { | |
598443a2 FT |
808 | struct bsg_device *bd; |
809 | struct bsg_class_device *bcd; | |
3d6392cf | 810 | |
3d6392cf JA |
811 | /* |
812 | * find the class device | |
813 | */ | |
3d6392cf | 814 | mutex_lock(&bsg_mutex); |
598443a2 | 815 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
d45ac4fa | 816 | if (bcd) |
97f46ae4 | 817 | kref_get(&bcd->ref); |
3d6392cf JA |
818 | mutex_unlock(&bsg_mutex); |
819 | ||
820 | if (!bcd) | |
821 | return ERR_PTR(-ENODEV); | |
822 | ||
842ea771 | 823 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
d45ac4fa FT |
824 | if (bd) |
825 | return bd; | |
826 | ||
827 | bd = bsg_add_device(inode, bcd->queue, file); | |
828 | if (IS_ERR(bd)) | |
97f46ae4 | 829 | kref_put(&bcd->ref, bsg_kref_release_function); |
d45ac4fa FT |
830 | |
831 | return bd; | |
3d6392cf JA |
832 | } |
833 | ||
834 | static int bsg_open(struct inode *inode, struct file *file) | |
835 | { | |
75bd2ef1 JC |
836 | struct bsg_device *bd; |
837 | ||
838 | lock_kernel(); | |
839 | bd = bsg_get_device(inode, file); | |
840 | unlock_kernel(); | |
3d6392cf JA |
841 | |
842 | if (IS_ERR(bd)) | |
843 | return PTR_ERR(bd); | |
844 | ||
845 | file->private_data = bd; | |
846 | return 0; | |
847 | } | |
848 | ||
849 | static int bsg_release(struct inode *inode, struct file *file) | |
850 | { | |
851 | struct bsg_device *bd = file->private_data; | |
852 | ||
853 | file->private_data = NULL; | |
854 | return bsg_put_device(bd); | |
855 | } | |
856 | ||
857 | static unsigned int bsg_poll(struct file *file, poll_table *wait) | |
858 | { | |
859 | struct bsg_device *bd = file->private_data; | |
860 | unsigned int mask = 0; | |
861 | ||
862 | poll_wait(file, &bd->wq_done, wait); | |
863 | poll_wait(file, &bd->wq_free, wait); | |
864 | ||
865 | spin_lock_irq(&bd->lock); | |
866 | if (!list_empty(&bd->done_list)) | |
867 | mask |= POLLIN | POLLRDNORM; | |
868 | if (bd->queued_cmds >= bd->max_queue) | |
869 | mask |= POLLOUT; | |
870 | spin_unlock_irq(&bd->lock); | |
871 | ||
872 | return mask; | |
873 | } | |
874 | ||
25fd1643 | 875 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
876 | { |
877 | struct bsg_device *bd = file->private_data; | |
878 | int __user *uarg = (int __user *) arg; | |
2d507a01 | 879 | int ret; |
3d6392cf | 880 | |
3d6392cf JA |
881 | switch (cmd) { |
882 | /* | |
883 | * our own ioctls | |
884 | */ | |
885 | case SG_GET_COMMAND_Q: | |
886 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 887 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
888 | int queue; |
889 | ||
890 | if (get_user(queue, uarg)) | |
891 | return -EFAULT; | |
5309cb38 | 892 | if (queue < 1) |
3d6392cf JA |
893 | return -EINVAL; |
894 | ||
5309cb38 | 895 | spin_lock_irq(&bd->lock); |
3d6392cf | 896 | bd->max_queue = queue; |
5309cb38 | 897 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
898 | return 0; |
899 | } | |
900 | ||
901 | /* | |
902 | * SCSI/sg ioctls | |
903 | */ | |
904 | case SG_GET_VERSION_NUM: | |
905 | case SCSI_IOCTL_GET_IDLUN: | |
906 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
907 | case SG_SET_TIMEOUT: | |
908 | case SG_GET_TIMEOUT: | |
909 | case SG_GET_RESERVED_SIZE: | |
910 | case SG_SET_RESERVED_SIZE: | |
911 | case SG_EMULATED_HOST: | |
3d6392cf JA |
912 | case SCSI_IOCTL_SEND_COMMAND: { |
913 | void __user *uarg = (void __user *) arg; | |
d351af01 | 914 | return scsi_cmd_ioctl(file, bd->queue, NULL, cmd, uarg); |
3d6392cf | 915 | } |
10e8855b FT |
916 | case SG_IO: { |
917 | struct request *rq; | |
2c9ecdf4 | 918 | struct bio *bio, *bidi_bio = NULL; |
10e8855b FT |
919 | struct sg_io_v4 hdr; |
920 | ||
921 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
922 | return -EFAULT; | |
923 | ||
abf54393 | 924 | rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE); |
10e8855b FT |
925 | if (IS_ERR(rq)) |
926 | return PTR_ERR(rq); | |
927 | ||
928 | bio = rq->bio; | |
2c9ecdf4 FT |
929 | if (rq->next_rq) |
930 | bidi_bio = rq->next_rq->bio; | |
d351af01 | 931 | blk_execute_rq(bd->queue, NULL, rq, 0); |
2d507a01 | 932 | ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
933 | |
934 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
935 | return -EFAULT; | |
b711afa6 | 936 | |
2d507a01 | 937 | return ret; |
10e8855b | 938 | } |
3d6392cf JA |
939 | /* |
940 | * block device ioctls | |
941 | */ | |
942 | default: | |
943 | #if 0 | |
944 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
945 | #else | |
946 | return -ENOTTY; | |
947 | #endif | |
948 | } | |
949 | } | |
950 | ||
7344be05 | 951 | static const struct file_operations bsg_fops = { |
3d6392cf JA |
952 | .read = bsg_read, |
953 | .write = bsg_write, | |
954 | .poll = bsg_poll, | |
955 | .open = bsg_open, | |
956 | .release = bsg_release, | |
25fd1643 | 957 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf JA |
958 | .owner = THIS_MODULE, |
959 | }; | |
960 | ||
d351af01 | 961 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 962 | { |
d351af01 | 963 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 964 | |
df468820 FT |
965 | if (!bcd->class_dev) |
966 | return; | |
3d6392cf JA |
967 | |
968 | mutex_lock(&bsg_mutex); | |
598443a2 | 969 | idr_remove(&bsg_minor_idr, bcd->minor); |
d351af01 | 970 | sysfs_remove_link(&q->kobj, "bsg"); |
ee959b00 | 971 | device_unregister(bcd->class_dev); |
3d6392cf | 972 | bcd->class_dev = NULL; |
97f46ae4 | 973 | kref_put(&bcd->ref, bsg_kref_release_function); |
3d6392cf JA |
974 | mutex_unlock(&bsg_mutex); |
975 | } | |
4cf0723a | 976 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 977 | |
97f46ae4 FT |
978 | int bsg_register_queue(struct request_queue *q, struct device *parent, |
979 | const char *name, void (*release)(struct device *)) | |
3d6392cf | 980 | { |
598443a2 | 981 | struct bsg_class_device *bcd; |
3d6392cf | 982 | dev_t dev; |
598443a2 | 983 | int ret, minor; |
ee959b00 | 984 | struct device *class_dev = NULL; |
39dca558 JB |
985 | const char *devname; |
986 | ||
987 | if (name) | |
988 | devname = name; | |
989 | else | |
97f46ae4 | 990 | devname = parent->bus_id; |
3d6392cf JA |
991 | |
992 | /* | |
993 | * we need a proper transport to send commands, not a stacked device | |
994 | */ | |
995 | if (!q->request_fn) | |
996 | return 0; | |
997 | ||
d351af01 | 998 | bcd = &q->bsg_dev; |
3d6392cf | 999 | memset(bcd, 0, sizeof(*bcd)); |
3d6392cf JA |
1000 | |
1001 | mutex_lock(&bsg_mutex); | |
292b7f27 | 1002 | |
598443a2 FT |
1003 | ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL); |
1004 | if (!ret) { | |
1005 | ret = -ENOMEM; | |
1006 | goto unlock; | |
292b7f27 FT |
1007 | } |
1008 | ||
598443a2 FT |
1009 | ret = idr_get_new(&bsg_minor_idr, bcd, &minor); |
1010 | if (ret < 0) | |
1011 | goto unlock; | |
292b7f27 | 1012 | |
598443a2 FT |
1013 | if (minor >= BSG_MAX_DEVS) { |
1014 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
1015 | ret = -EINVAL; | |
1016 | goto remove_idr; | |
1017 | } | |
1018 | ||
1019 | bcd->minor = minor; | |
d351af01 | 1020 | bcd->queue = q; |
97f46ae4 FT |
1021 | bcd->parent = get_device(parent); |
1022 | bcd->release = release; | |
1023 | kref_init(&bcd->ref); | |
46f6ef4a | 1024 | dev = MKDEV(bsg_major, bcd->minor); |
f79f0605 GKH |
1025 | class_dev = device_create_drvdata(bsg_class, parent, dev, NULL, |
1026 | "%s", devname); | |
4e2872d6 FT |
1027 | if (IS_ERR(class_dev)) { |
1028 | ret = PTR_ERR(class_dev); | |
598443a2 | 1029 | goto put_dev; |
4e2872d6 FT |
1030 | } |
1031 | bcd->class_dev = class_dev; | |
1032 | ||
abce891a | 1033 | if (q->kobj.sd) { |
4e2872d6 FT |
1034 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
1035 | if (ret) | |
598443a2 | 1036 | goto unregister_class_dev; |
4e2872d6 FT |
1037 | } |
1038 | ||
3d6392cf JA |
1039 | mutex_unlock(&bsg_mutex); |
1040 | return 0; | |
6826ee4f | 1041 | |
598443a2 | 1042 | unregister_class_dev: |
ee959b00 | 1043 | device_unregister(class_dev); |
598443a2 | 1044 | put_dev: |
97f46ae4 | 1045 | put_device(parent); |
598443a2 FT |
1046 | remove_idr: |
1047 | idr_remove(&bsg_minor_idr, minor); | |
1048 | unlock: | |
264a0472 | 1049 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
1050 | return ret; |
1051 | } | |
4cf0723a | 1052 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 | 1053 | |
7e7654a9 | 1054 | static struct cdev bsg_cdev; |
292b7f27 | 1055 | |
3d6392cf JA |
1056 | static int __init bsg_init(void) |
1057 | { | |
1058 | int ret, i; | |
46f6ef4a | 1059 | dev_t devid; |
3d6392cf | 1060 | |
5309cb38 | 1061 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83 | 1062 | sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38 JA |
1063 | if (!bsg_cmd_cachep) { |
1064 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1065 | return -ENOMEM; | |
1066 | } | |
1067 | ||
25fd1643 | 1068 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1069 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1070 | ||
1071 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 | 1072 | if (IS_ERR(bsg_class)) { |
9b9f770c FT |
1073 | ret = PTR_ERR(bsg_class); |
1074 | goto destroy_kmemcache; | |
5309cb38 | 1075 | } |
3d6392cf | 1076 | |
46f6ef4a | 1077 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
1078 | if (ret) |
1079 | goto destroy_bsg_class; | |
292b7f27 | 1080 | |
46f6ef4a JA |
1081 | bsg_major = MAJOR(devid); |
1082 | ||
292b7f27 | 1083 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 1084 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
1085 | if (ret) |
1086 | goto unregister_chrdev; | |
3d6392cf | 1087 | |
5d3a8cd3 | 1088 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 1089 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 1090 | return 0; |
9b9f770c FT |
1091 | unregister_chrdev: |
1092 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
1093 | destroy_bsg_class: | |
1094 | class_destroy(bsg_class); | |
1095 | destroy_kmemcache: | |
1096 | kmem_cache_destroy(bsg_cmd_cachep); | |
1097 | return ret; | |
3d6392cf JA |
1098 | } |
1099 | ||
1100 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 1101 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
1102 | MODULE_LICENSE("GPL"); |
1103 | ||
4e2872d6 | 1104 | device_initcall(bsg_init); |