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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> | |
ad5ebd2f | 18 | #include <linux/jiffies.h> |
3d6392cf JA |
19 | #include <linux/percpu.h> |
20 | #include <linux/uio.h> | |
598443a2 | 21 | #include <linux/idr.h> |
3d6392cf | 22 | #include <linux/bsg.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
3d6392cf JA |
24 | |
25 | #include <scsi/scsi.h> | |
26 | #include <scsi/scsi_ioctl.h> | |
27 | #include <scsi/scsi_cmnd.h> | |
4e2872d6 FT |
28 | #include <scsi/scsi_device.h> |
29 | #include <scsi/scsi_driver.h> | |
3d6392cf JA |
30 | #include <scsi/sg.h> |
31 | ||
0ed081ce FT |
32 | #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" |
33 | #define BSG_VERSION "0.4" | |
3d6392cf | 34 | |
3d6392cf | 35 | struct bsg_device { |
165125e1 | 36 | struct request_queue *queue; |
3d6392cf JA |
37 | spinlock_t lock; |
38 | struct list_head busy_list; | |
39 | struct list_head done_list; | |
40 | struct hlist_node dev_list; | |
41 | atomic_t ref_count; | |
3d6392cf JA |
42 | int queued_cmds; |
43 | int done_cmds; | |
3d6392cf JA |
44 | wait_queue_head_t wq_done; |
45 | wait_queue_head_t wq_free; | |
3ada8b7e | 46 | char name[20]; |
3d6392cf JA |
47 | int max_queue; |
48 | unsigned long flags; | |
49 | }; | |
50 | ||
51 | enum { | |
52 | BSG_F_BLOCK = 1, | |
3d6392cf JA |
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 | }; |
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 | ||
165125e1 | 138 | static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
abf54393 | 139 | struct sg_io_v4 *hdr, struct bsg_device *bd, |
aeb5d727 | 140 | fmode_t has_write_perm) |
70e36ece | 141 | { |
82ed4db4 CH |
142 | struct scsi_request *req = scsi_req(rq); |
143 | ||
9f5de6b1 | 144 | if (hdr->request_len > BLK_MAX_CDB) { |
82ed4db4 CH |
145 | req->cmd = kzalloc(hdr->request_len, GFP_KERNEL); |
146 | if (!req->cmd) | |
9f5de6b1 FT |
147 | return -ENOMEM; |
148 | } | |
70e36ece | 149 | |
82ed4db4 | 150 | if (copy_from_user(req->cmd, (void __user *)(unsigned long)hdr->request, |
70e36ece FT |
151 | hdr->request_len)) |
152 | return -EFAULT; | |
15d10b61 FT |
153 | |
154 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { | |
82ed4db4 | 155 | if (blk_verify_command(req->cmd, has_write_perm)) |
15d10b61 FT |
156 | return -EPERM; |
157 | } else if (!capable(CAP_SYS_RAWIO)) | |
70e36ece FT |
158 | return -EPERM; |
159 | ||
160 | /* | |
161 | * fill in request structure | |
162 | */ | |
82ed4db4 | 163 | req->cmd_len = hdr->request_len; |
70e36ece | 164 | |
ad5ebd2f | 165 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
70e36ece FT |
166 | if (!rq->timeout) |
167 | rq->timeout = q->sg_timeout; | |
168 | if (!rq->timeout) | |
169 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
170 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
171 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
70e36ece FT |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
3d6392cf | 176 | /* |
70e36ece | 177 | * Check if sg_io_v4 from user is allowed and valid |
3d6392cf JA |
178 | */ |
179 | static int | |
aebf526b | 180 | bsg_validate_sgv4_hdr(struct sg_io_v4 *hdr, int *op) |
3d6392cf | 181 | { |
15d10b61 FT |
182 | int ret = 0; |
183 | ||
70e36ece | 184 | if (hdr->guard != 'Q') |
3d6392cf | 185 | return -EINVAL; |
3d6392cf | 186 | |
15d10b61 FT |
187 | switch (hdr->protocol) { |
188 | case BSG_PROTOCOL_SCSI: | |
189 | switch (hdr->subprotocol) { | |
190 | case BSG_SUB_PROTOCOL_SCSI_CMD: | |
191 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: | |
192 | break; | |
193 | default: | |
194 | ret = -EINVAL; | |
195 | } | |
196 | break; | |
197 | default: | |
198 | ret = -EINVAL; | |
199 | } | |
70e36ece | 200 | |
aebf526b | 201 | *op = hdr->dout_xfer_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN; |
15d10b61 | 202 | return ret; |
3d6392cf JA |
203 | } |
204 | ||
205 | /* | |
70e36ece | 206 | * map sg_io_v4 to a request. |
3d6392cf JA |
207 | */ |
208 | static struct request * | |
82ed4db4 | 209 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm) |
3d6392cf | 210 | { |
165125e1 | 211 | struct request_queue *q = bd->queue; |
2c9ecdf4 | 212 | struct request *rq, *next_rq = NULL; |
aebf526b CH |
213 | int ret; |
214 | unsigned int op, dxfer_len; | |
2b727c63 | 215 | void __user *dxferp = NULL; |
c7a841f3 JS |
216 | struct bsg_class_device *bcd = &q->bsg_dev; |
217 | ||
218 | /* if the LLD has been removed then the bsg_unregister_queue will | |
219 | * eventually be called and the class_dev was freed, so we can no | |
220 | * longer use this request_queue. Return no such address. | |
221 | */ | |
222 | if (!bcd->class_dev) | |
223 | return ERR_PTR(-ENXIO); | |
3d6392cf | 224 | |
70e36ece FT |
225 | dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, |
226 | hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, | |
227 | hdr->din_xfer_len); | |
3d6392cf | 228 | |
aebf526b | 229 | ret = bsg_validate_sgv4_hdr(hdr, &op); |
3d6392cf JA |
230 | if (ret) |
231 | return ERR_PTR(ret); | |
232 | ||
233 | /* | |
3ad2f3fb | 234 | * map scatter-gather elements separately and string them to request |
3d6392cf | 235 | */ |
aebf526b | 236 | rq = blk_get_request(q, op, GFP_KERNEL); |
a492f075 JL |
237 | if (IS_ERR(rq)) |
238 | return rq; | |
82ed4db4 | 239 | scsi_req_init(rq); |
f27b087b | 240 | |
abf54393 | 241 | ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); |
2c9ecdf4 FT |
242 | if (ret) |
243 | goto out; | |
244 | ||
aebf526b | 245 | if (op == REQ_OP_SCSI_OUT && hdr->din_xfer_len) { |
2c9ecdf4 FT |
246 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { |
247 | ret = -EOPNOTSUPP; | |
248 | goto out; | |
249 | } | |
250 | ||
aebf526b | 251 | next_rq = blk_get_request(q, REQ_OP_SCSI_IN, GFP_KERNEL); |
a492f075 JL |
252 | if (IS_ERR(next_rq)) { |
253 | ret = PTR_ERR(next_rq); | |
55872c5a | 254 | next_rq = NULL; |
2c9ecdf4 FT |
255 | goto out; |
256 | } | |
257 | rq->next_rq = next_rq; | |
258 | ||
2b727c63 | 259 | dxferp = (void __user *)(unsigned long)hdr->din_xferp; |
152e283f FT |
260 | ret = blk_rq_map_user(q, next_rq, NULL, dxferp, |
261 | hdr->din_xfer_len, GFP_KERNEL); | |
2c9ecdf4 FT |
262 | if (ret) |
263 | goto out; | |
3d6392cf JA |
264 | } |
265 | ||
70e36ece FT |
266 | if (hdr->dout_xfer_len) { |
267 | dxfer_len = hdr->dout_xfer_len; | |
2b727c63 | 268 | dxferp = (void __user *)(unsigned long)hdr->dout_xferp; |
70e36ece FT |
269 | } else if (hdr->din_xfer_len) { |
270 | dxfer_len = hdr->din_xfer_len; | |
2b727c63 | 271 | dxferp = (void __user *)(unsigned long)hdr->din_xferp; |
70e36ece FT |
272 | } else |
273 | dxfer_len = 0; | |
274 | ||
275 | if (dxfer_len) { | |
152e283f FT |
276 | ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len, |
277 | GFP_KERNEL); | |
2c9ecdf4 FT |
278 | if (ret) |
279 | goto out; | |
3d6392cf | 280 | } |
c1c20120 | 281 | |
3d6392cf | 282 | return rq; |
2c9ecdf4 | 283 | out: |
82ed4db4 | 284 | scsi_req_free_cmd(scsi_req(rq)); |
2c9ecdf4 FT |
285 | blk_put_request(rq); |
286 | if (next_rq) { | |
287 | blk_rq_unmap_user(next_rq->bio); | |
288 | blk_put_request(next_rq); | |
289 | } | |
290 | return ERR_PTR(ret); | |
3d6392cf JA |
291 | } |
292 | ||
293 | /* | |
294 | * async completion call-back from the block layer, when scsi/ide/whatever | |
295 | * calls end_that_request_last() on a request | |
296 | */ | |
297 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
298 | { | |
299 | struct bsg_command *bc = rq->end_io_data; | |
300 | struct bsg_device *bd = bc->bd; | |
301 | unsigned long flags; | |
302 | ||
5309cb38 JA |
303 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
304 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
305 | |
306 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
307 | ||
308 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
309 | list_move_tail(&bc->list, &bd->done_list); |
310 | bd->done_cmds++; | |
3d6392cf | 311 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
312 | |
313 | wake_up(&bd->wq_done); | |
3d6392cf JA |
314 | } |
315 | ||
316 | /* | |
317 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
318 | * layer for io | |
319 | */ | |
165125e1 | 320 | static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
3d6392cf JA |
321 | struct bsg_command *bc, struct request *rq) |
322 | { | |
05378940 BH |
323 | int at_head = (0 == (bc->hdr.flags & BSG_FLAG_Q_AT_TAIL)); |
324 | ||
3d6392cf JA |
325 | /* |
326 | * add bc command to busy queue and submit rq for io | |
327 | */ | |
328 | bc->rq = rq; | |
329 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
330 | if (rq->next_rq) |
331 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
332 | bc->hdr.duration = jiffies; |
333 | spin_lock_irq(&bd->lock); | |
334 | list_add_tail(&bc->list, &bd->busy_list); | |
335 | spin_unlock_irq(&bd->lock); | |
336 | ||
337 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
338 | ||
339 | rq->end_io_data = bc; | |
05378940 | 340 | blk_execute_rq_nowait(q, NULL, rq, at_head, bsg_rq_end_io); |
3d6392cf JA |
341 | } |
342 | ||
25fd1643 | 343 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
344 | { |
345 | struct bsg_command *bc = NULL; | |
346 | ||
347 | spin_lock_irq(&bd->lock); | |
348 | if (bd->done_cmds) { | |
43ac9e62 | 349 | bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
25fd1643 JA |
350 | list_del(&bc->list); |
351 | bd->done_cmds--; | |
3d6392cf JA |
352 | } |
353 | spin_unlock_irq(&bd->lock); | |
354 | ||
355 | return bc; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Get a finished command from the done list | |
360 | */ | |
e7d72173 | 361 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
362 | { |
363 | struct bsg_command *bc; | |
364 | int ret; | |
365 | ||
366 | do { | |
367 | bc = bsg_next_done_cmd(bd); | |
368 | if (bc) | |
369 | break; | |
370 | ||
e7d72173 FT |
371 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
372 | bc = ERR_PTR(-EAGAIN); | |
373 | break; | |
374 | } | |
375 | ||
376 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 377 | if (ret) { |
e7d72173 | 378 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
379 | break; |
380 | } | |
381 | } while (1); | |
382 | ||
383 | dprintk("%s: returning done %p\n", bd->name, bc); | |
384 | ||
385 | return bc; | |
386 | } | |
387 | ||
70e36ece | 388 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 389 | struct bio *bio, struct bio *bidi_bio) |
70e36ece | 390 | { |
82ed4db4 | 391 | struct scsi_request *req = scsi_req(rq); |
70e36ece FT |
392 | int ret = 0; |
393 | ||
17d5363b | 394 | dprintk("rq %p bio %p 0x%x\n", rq, bio, req->result); |
70e36ece FT |
395 | /* |
396 | * fill in all the output members | |
397 | */ | |
17d5363b CH |
398 | hdr->device_status = req->result & 0xff; |
399 | hdr->transport_status = host_byte(req->result); | |
400 | hdr->driver_status = driver_byte(req->result); | |
70e36ece FT |
401 | hdr->info = 0; |
402 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
403 | hdr->info |= SG_INFO_CHECK; | |
70e36ece FT |
404 | hdr->response_len = 0; |
405 | ||
82ed4db4 | 406 | if (req->sense_len && hdr->response) { |
25fd1643 | 407 | int len = min_t(unsigned int, hdr->max_response_len, |
82ed4db4 | 408 | req->sense_len); |
70e36ece | 409 | |
2b727c63 | 410 | ret = copy_to_user((void __user *)(unsigned long)hdr->response, |
82ed4db4 | 411 | req->sense, len); |
70e36ece FT |
412 | if (!ret) |
413 | hdr->response_len = len; | |
414 | else | |
415 | ret = -EFAULT; | |
416 | } | |
417 | ||
2c9ecdf4 | 418 | if (rq->next_rq) { |
82ed4db4 CH |
419 | hdr->dout_resid = req->resid_len; |
420 | hdr->din_resid = scsi_req(rq->next_rq)->resid_len; | |
2c9ecdf4 FT |
421 | blk_rq_unmap_user(bidi_bio); |
422 | blk_put_request(rq->next_rq); | |
0c6a89ba | 423 | } else if (rq_data_dir(rq) == READ) |
82ed4db4 | 424 | hdr->din_resid = req->resid_len; |
0c6a89ba | 425 | else |
82ed4db4 | 426 | hdr->dout_resid = req->resid_len; |
2c9ecdf4 | 427 | |
2d507a01 JB |
428 | /* |
429 | * If the request generated a negative error number, return it | |
430 | * (providing we aren't already returning an error); if it's | |
431 | * just a protocol response (i.e. non negative), that gets | |
432 | * processed above. | |
433 | */ | |
17d5363b CH |
434 | if (!ret && req->result < 0) |
435 | ret = req->result; | |
2d507a01 | 436 | |
70e36ece | 437 | blk_rq_unmap_user(bio); |
82ed4db4 | 438 | scsi_req_free_cmd(req); |
70e36ece FT |
439 | blk_put_request(rq); |
440 | ||
441 | return ret; | |
442 | } | |
443 | ||
2c561246 PZ |
444 | static bool bsg_complete(struct bsg_device *bd) |
445 | { | |
446 | bool ret = false; | |
447 | bool spin; | |
448 | ||
449 | do { | |
450 | spin_lock_irq(&bd->lock); | |
451 | ||
452 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
453 | ||
454 | /* | |
455 | * All commands consumed. | |
456 | */ | |
457 | if (bd->done_cmds == bd->queued_cmds) | |
458 | ret = true; | |
459 | ||
460 | spin = !test_bit(BSG_F_BLOCK, &bd->flags); | |
461 | ||
462 | spin_unlock_irq(&bd->lock); | |
463 | } while (!ret && spin); | |
464 | ||
465 | return ret; | |
466 | } | |
467 | ||
3d6392cf JA |
468 | static int bsg_complete_all_commands(struct bsg_device *bd) |
469 | { | |
470 | struct bsg_command *bc; | |
471 | int ret, tret; | |
472 | ||
473 | dprintk("%s: entered\n", bd->name); | |
474 | ||
3d6392cf JA |
475 | /* |
476 | * wait for all commands to complete | |
477 | */ | |
2c561246 | 478 | io_wait_event(bd->wq_done, bsg_complete(bd)); |
3d6392cf JA |
479 | |
480 | /* | |
481 | * discard done commands | |
482 | */ | |
483 | ret = 0; | |
484 | do { | |
e7d72173 FT |
485 | spin_lock_irq(&bd->lock); |
486 | if (!bd->queued_cmds) { | |
487 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
488 | break; |
489 | } | |
efba1a31 | 490 | spin_unlock_irq(&bd->lock); |
3d6392cf | 491 | |
e7d72173 FT |
492 | bc = bsg_get_done_cmd(bd); |
493 | if (IS_ERR(bc)) | |
494 | break; | |
495 | ||
2c9ecdf4 FT |
496 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
497 | bc->bidi_bio); | |
3d6392cf JA |
498 | if (!ret) |
499 | ret = tret; | |
500 | ||
501 | bsg_free_command(bc); | |
502 | } while (1); | |
503 | ||
504 | return ret; | |
505 | } | |
506 | ||
25fd1643 | 507 | static int |
e7d72173 FT |
508 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
509 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
510 | { |
511 | struct bsg_command *bc; | |
512 | int nr_commands, ret; | |
513 | ||
70e36ece | 514 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
515 | return -EINVAL; |
516 | ||
517 | ret = 0; | |
70e36ece | 518 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 519 | while (nr_commands) { |
e7d72173 | 520 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
521 | if (IS_ERR(bc)) { |
522 | ret = PTR_ERR(bc); | |
523 | break; | |
524 | } | |
525 | ||
526 | /* | |
527 | * this is the only case where we need to copy data back | |
528 | * after completing the request. so do that here, | |
529 | * bsg_complete_work() cannot do that for us | |
530 | */ | |
2c9ecdf4 FT |
531 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
532 | bc->bidi_bio); | |
3d6392cf | 533 | |
25fd1643 | 534 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
535 | ret = -EFAULT; |
536 | ||
537 | bsg_free_command(bc); | |
538 | ||
539 | if (ret) | |
540 | break; | |
541 | ||
70e36ece FT |
542 | buf += sizeof(struct sg_io_v4); |
543 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
544 | nr_commands--; |
545 | } | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
551 | { | |
552 | if (file->f_flags & O_NONBLOCK) | |
553 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
554 | else | |
555 | set_bit(BSG_F_BLOCK, &bd->flags); | |
556 | } | |
557 | ||
25fd1643 JA |
558 | /* |
559 | * Check if the error is a "real" error that we should return. | |
560 | */ | |
3d6392cf JA |
561 | static inline int err_block_err(int ret) |
562 | { | |
563 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
564 | return 1; | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static ssize_t | |
570 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
571 | { | |
572 | struct bsg_device *bd = file->private_data; | |
573 | int ret; | |
574 | ssize_t bytes_read; | |
575 | ||
5b5e0928 | 576 | dprintk("%s: read %zd bytes\n", bd->name, count); |
3d6392cf JA |
577 | |
578 | bsg_set_block(bd, file); | |
0b07de85 | 579 | |
3d6392cf | 580 | bytes_read = 0; |
e7d72173 | 581 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
582 | *ppos = bytes_read; |
583 | ||
44194e3e | 584 | if (!bytes_read || err_block_err(ret)) |
3d6392cf JA |
585 | bytes_read = ret; |
586 | ||
587 | return bytes_read; | |
588 | } | |
589 | ||
25fd1643 | 590 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
aeb5d727 AV |
591 | size_t count, ssize_t *bytes_written, |
592 | fmode_t has_write_perm) | |
3d6392cf JA |
593 | { |
594 | struct bsg_command *bc; | |
595 | struct request *rq; | |
596 | int ret, nr_commands; | |
597 | ||
70e36ece | 598 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
599 | return -EINVAL; |
600 | ||
70e36ece | 601 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
602 | rq = NULL; |
603 | bc = NULL; | |
604 | ret = 0; | |
605 | while (nr_commands) { | |
165125e1 | 606 | struct request_queue *q = bd->queue; |
3d6392cf | 607 | |
e7d72173 | 608 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
609 | if (IS_ERR(bc)) { |
610 | ret = PTR_ERR(bc); | |
611 | bc = NULL; | |
612 | break; | |
613 | } | |
614 | ||
3d6392cf JA |
615 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
616 | ret = -EFAULT; | |
617 | break; | |
618 | } | |
619 | ||
620 | /* | |
621 | * get a request, fill in the blanks, and add to request queue | |
622 | */ | |
82ed4db4 | 623 | rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm); |
3d6392cf JA |
624 | if (IS_ERR(rq)) { |
625 | ret = PTR_ERR(rq); | |
626 | rq = NULL; | |
627 | break; | |
628 | } | |
629 | ||
630 | bsg_add_command(bd, q, bc, rq); | |
631 | bc = NULL; | |
632 | rq = NULL; | |
633 | nr_commands--; | |
70e36ece | 634 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 635 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
636 | } |
637 | ||
3d6392cf JA |
638 | if (bc) |
639 | bsg_free_command(bc); | |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
644 | static ssize_t | |
645 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
646 | { | |
647 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 648 | ssize_t bytes_written; |
3d6392cf JA |
649 | int ret; |
650 | ||
5b5e0928 | 651 | dprintk("%s: write %zd bytes\n", bd->name, count); |
3d6392cf | 652 | |
db68ce10 | 653 | if (unlikely(uaccess_kernel())) |
128394ef AV |
654 | return -EINVAL; |
655 | ||
3d6392cf | 656 | bsg_set_block(bd, file); |
3d6392cf | 657 | |
25fd1643 | 658 | bytes_written = 0; |
abf54393 FT |
659 | ret = __bsg_write(bd, buf, count, &bytes_written, |
660 | file->f_mode & FMODE_WRITE); | |
661 | ||
25fd1643 | 662 | *ppos = bytes_written; |
3d6392cf JA |
663 | |
664 | /* | |
665 | * return bytes written on non-fatal errors | |
666 | */ | |
44194e3e | 667 | if (!bytes_written || err_block_err(ret)) |
25fd1643 | 668 | bytes_written = ret; |
3d6392cf | 669 | |
5b5e0928 | 670 | dprintk("%s: returning %zd\n", bd->name, bytes_written); |
25fd1643 | 671 | return bytes_written; |
3d6392cf JA |
672 | } |
673 | ||
3d6392cf JA |
674 | static struct bsg_device *bsg_alloc_device(void) |
675 | { | |
3d6392cf | 676 | struct bsg_device *bd; |
3d6392cf JA |
677 | |
678 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
679 | if (unlikely(!bd)) | |
680 | return NULL; | |
681 | ||
682 | spin_lock_init(&bd->lock); | |
683 | ||
5309cb38 | 684 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
685 | |
686 | INIT_LIST_HEAD(&bd->busy_list); | |
687 | INIT_LIST_HEAD(&bd->done_list); | |
688 | INIT_HLIST_NODE(&bd->dev_list); | |
689 | ||
690 | init_waitqueue_head(&bd->wq_free); | |
691 | init_waitqueue_head(&bd->wq_done); | |
692 | return bd; | |
3d6392cf JA |
693 | } |
694 | ||
97f46ae4 FT |
695 | static void bsg_kref_release_function(struct kref *kref) |
696 | { | |
697 | struct bsg_class_device *bcd = | |
698 | container_of(kref, struct bsg_class_device, ref); | |
8df5fc04 | 699 | struct device *parent = bcd->parent; |
97f46ae4 FT |
700 | |
701 | if (bcd->release) | |
702 | bcd->release(bcd->parent); | |
703 | ||
8df5fc04 | 704 | put_device(parent); |
97f46ae4 FT |
705 | } |
706 | ||
3d6392cf JA |
707 | static int bsg_put_device(struct bsg_device *bd) |
708 | { | |
97f46ae4 FT |
709 | int ret = 0, do_free; |
710 | struct request_queue *q = bd->queue; | |
3d6392cf JA |
711 | |
712 | mutex_lock(&bsg_mutex); | |
713 | ||
97f46ae4 | 714 | do_free = atomic_dec_and_test(&bd->ref_count); |
3f27e3ed FT |
715 | if (!do_free) { |
716 | mutex_unlock(&bsg_mutex); | |
3d6392cf | 717 | goto out; |
3f27e3ed FT |
718 | } |
719 | ||
720 | hlist_del(&bd->dev_list); | |
721 | mutex_unlock(&bsg_mutex); | |
3d6392cf JA |
722 | |
723 | dprintk("%s: tearing down\n", bd->name); | |
724 | ||
725 | /* | |
726 | * close can always block | |
727 | */ | |
728 | set_bit(BSG_F_BLOCK, &bd->flags); | |
729 | ||
730 | /* | |
731 | * correct error detection baddies here again. it's the responsibility | |
732 | * of the app to properly reap commands before close() if it wants | |
733 | * fool-proof error detection | |
734 | */ | |
735 | ret = bsg_complete_all_commands(bd); | |
736 | ||
5309cb38 | 737 | kfree(bd); |
3d6392cf | 738 | out: |
97f46ae4 FT |
739 | kref_put(&q->bsg_dev.ref, bsg_kref_release_function); |
740 | if (do_free) | |
741 | blk_put_queue(q); | |
3d6392cf JA |
742 | return ret; |
743 | } | |
744 | ||
745 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 746 | struct request_queue *rq, |
3d6392cf JA |
747 | struct file *file) |
748 | { | |
25fd1643 | 749 | struct bsg_device *bd; |
3d6392cf JA |
750 | #ifdef BSG_DEBUG |
751 | unsigned char buf[32]; | |
752 | #endif | |
d9f97264 BVA |
753 | |
754 | if (!blk_queue_scsi_passthrough(rq)) { | |
755 | WARN_ONCE(true, "Attempt to register a non-SCSI queue\n"); | |
756 | return ERR_PTR(-EINVAL); | |
757 | } | |
758 | ||
09ac46c4 | 759 | if (!blk_get_queue(rq)) |
c3ff1b90 | 760 | return ERR_PTR(-ENXIO); |
3d6392cf JA |
761 | |
762 | bd = bsg_alloc_device(); | |
c3ff1b90 FT |
763 | if (!bd) { |
764 | blk_put_queue(rq); | |
3d6392cf | 765 | return ERR_PTR(-ENOMEM); |
c3ff1b90 | 766 | } |
3d6392cf | 767 | |
d351af01 | 768 | bd->queue = rq; |
0b07de85 | 769 | |
3d6392cf JA |
770 | bsg_set_block(bd, file); |
771 | ||
772 | atomic_set(&bd->ref_count, 1); | |
3d6392cf | 773 | mutex_lock(&bsg_mutex); |
842ea771 | 774 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cf | 775 | |
3ada8b7e | 776 | strncpy(bd->name, dev_name(rq->bsg_dev.class_dev), sizeof(bd->name) - 1); |
3d6392cf | 777 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 778 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
779 | |
780 | mutex_unlock(&bsg_mutex); | |
781 | return bd; | |
782 | } | |
783 | ||
842ea771 | 784 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cf | 785 | { |
43ac9e62 | 786 | struct bsg_device *bd; |
3d6392cf JA |
787 | |
788 | mutex_lock(&bsg_mutex); | |
789 | ||
b67bfe0d | 790 | hlist_for_each_entry(bd, bsg_dev_idx_hash(minor), dev_list) { |
842ea771 | 791 | if (bd->queue == q) { |
3d6392cf | 792 | atomic_inc(&bd->ref_count); |
43ac9e62 | 793 | goto found; |
3d6392cf | 794 | } |
3d6392cf | 795 | } |
43ac9e62 FT |
796 | bd = NULL; |
797 | found: | |
3d6392cf JA |
798 | mutex_unlock(&bsg_mutex); |
799 | return bd; | |
800 | } | |
801 | ||
802 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
803 | { | |
598443a2 FT |
804 | struct bsg_device *bd; |
805 | struct bsg_class_device *bcd; | |
3d6392cf | 806 | |
3d6392cf JA |
807 | /* |
808 | * find the class device | |
809 | */ | |
3d6392cf | 810 | mutex_lock(&bsg_mutex); |
598443a2 | 811 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
d45ac4fa | 812 | if (bcd) |
97f46ae4 | 813 | kref_get(&bcd->ref); |
3d6392cf JA |
814 | mutex_unlock(&bsg_mutex); |
815 | ||
816 | if (!bcd) | |
817 | return ERR_PTR(-ENODEV); | |
818 | ||
842ea771 | 819 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
d45ac4fa FT |
820 | if (bd) |
821 | return bd; | |
822 | ||
823 | bd = bsg_add_device(inode, bcd->queue, file); | |
824 | if (IS_ERR(bd)) | |
97f46ae4 | 825 | kref_put(&bcd->ref, bsg_kref_release_function); |
d45ac4fa FT |
826 | |
827 | return bd; | |
3d6392cf JA |
828 | } |
829 | ||
830 | static int bsg_open(struct inode *inode, struct file *file) | |
831 | { | |
75bd2ef1 JC |
832 | struct bsg_device *bd; |
833 | ||
75bd2ef1 | 834 | bd = bsg_get_device(inode, file); |
3d6392cf JA |
835 | |
836 | if (IS_ERR(bd)) | |
837 | return PTR_ERR(bd); | |
838 | ||
839 | file->private_data = bd; | |
840 | return 0; | |
841 | } | |
842 | ||
843 | static int bsg_release(struct inode *inode, struct file *file) | |
844 | { | |
845 | struct bsg_device *bd = file->private_data; | |
846 | ||
847 | file->private_data = NULL; | |
848 | return bsg_put_device(bd); | |
849 | } | |
850 | ||
851 | static unsigned int bsg_poll(struct file *file, poll_table *wait) | |
852 | { | |
853 | struct bsg_device *bd = file->private_data; | |
854 | unsigned int mask = 0; | |
855 | ||
856 | poll_wait(file, &bd->wq_done, wait); | |
857 | poll_wait(file, &bd->wq_free, wait); | |
858 | ||
859 | spin_lock_irq(&bd->lock); | |
860 | if (!list_empty(&bd->done_list)) | |
861 | mask |= POLLIN | POLLRDNORM; | |
80ceb057 | 862 | if (bd->queued_cmds < bd->max_queue) |
3d6392cf JA |
863 | mask |= POLLOUT; |
864 | spin_unlock_irq(&bd->lock); | |
865 | ||
866 | return mask; | |
867 | } | |
868 | ||
25fd1643 | 869 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
870 | { |
871 | struct bsg_device *bd = file->private_data; | |
872 | int __user *uarg = (int __user *) arg; | |
2d507a01 | 873 | int ret; |
3d6392cf | 874 | |
3d6392cf JA |
875 | switch (cmd) { |
876 | /* | |
877 | * our own ioctls | |
878 | */ | |
879 | case SG_GET_COMMAND_Q: | |
880 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 881 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
882 | int queue; |
883 | ||
884 | if (get_user(queue, uarg)) | |
885 | return -EFAULT; | |
5309cb38 | 886 | if (queue < 1) |
3d6392cf JA |
887 | return -EINVAL; |
888 | ||
5309cb38 | 889 | spin_lock_irq(&bd->lock); |
3d6392cf | 890 | bd->max_queue = queue; |
5309cb38 | 891 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
892 | return 0; |
893 | } | |
894 | ||
895 | /* | |
896 | * SCSI/sg ioctls | |
897 | */ | |
898 | case SG_GET_VERSION_NUM: | |
899 | case SCSI_IOCTL_GET_IDLUN: | |
900 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
901 | case SG_SET_TIMEOUT: | |
902 | case SG_GET_TIMEOUT: | |
903 | case SG_GET_RESERVED_SIZE: | |
904 | case SG_SET_RESERVED_SIZE: | |
905 | case SG_EMULATED_HOST: | |
3d6392cf JA |
906 | case SCSI_IOCTL_SEND_COMMAND: { |
907 | void __user *uarg = (void __user *) arg; | |
74f3c8af | 908 | return scsi_cmd_ioctl(bd->queue, NULL, file->f_mode, cmd, uarg); |
3d6392cf | 909 | } |
10e8855b FT |
910 | case SG_IO: { |
911 | struct request *rq; | |
2c9ecdf4 | 912 | struct bio *bio, *bidi_bio = NULL; |
10e8855b | 913 | struct sg_io_v4 hdr; |
05378940 | 914 | int at_head; |
10e8855b FT |
915 | |
916 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
917 | return -EFAULT; | |
918 | ||
82ed4db4 | 919 | rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE); |
10e8855b FT |
920 | if (IS_ERR(rq)) |
921 | return PTR_ERR(rq); | |
922 | ||
923 | bio = rq->bio; | |
2c9ecdf4 FT |
924 | if (rq->next_rq) |
925 | bidi_bio = rq->next_rq->bio; | |
05378940 BH |
926 | |
927 | at_head = (0 == (hdr.flags & BSG_FLAG_Q_AT_TAIL)); | |
928 | blk_execute_rq(bd->queue, NULL, rq, at_head); | |
2d507a01 | 929 | ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
930 | |
931 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
932 | return -EFAULT; | |
b711afa6 | 933 | |
2d507a01 | 934 | return ret; |
10e8855b | 935 | } |
3d6392cf JA |
936 | /* |
937 | * block device ioctls | |
938 | */ | |
939 | default: | |
940 | #if 0 | |
941 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
942 | #else | |
943 | return -ENOTTY; | |
944 | #endif | |
945 | } | |
946 | } | |
947 | ||
7344be05 | 948 | static const struct file_operations bsg_fops = { |
3d6392cf JA |
949 | .read = bsg_read, |
950 | .write = bsg_write, | |
951 | .poll = bsg_poll, | |
952 | .open = bsg_open, | |
953 | .release = bsg_release, | |
25fd1643 | 954 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf | 955 | .owner = THIS_MODULE, |
6038f373 | 956 | .llseek = default_llseek, |
3d6392cf JA |
957 | }; |
958 | ||
d351af01 | 959 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 960 | { |
d351af01 | 961 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 962 | |
df468820 FT |
963 | if (!bcd->class_dev) |
964 | return; | |
3d6392cf JA |
965 | |
966 | mutex_lock(&bsg_mutex); | |
598443a2 | 967 | idr_remove(&bsg_minor_idr, bcd->minor); |
37b40adf SG |
968 | if (q->kobj.sd) |
969 | sysfs_remove_link(&q->kobj, "bsg"); | |
ee959b00 | 970 | device_unregister(bcd->class_dev); |
3d6392cf | 971 | bcd->class_dev = NULL; |
97f46ae4 | 972 | kref_put(&bcd->ref, bsg_kref_release_function); |
3d6392cf JA |
973 | mutex_unlock(&bsg_mutex); |
974 | } | |
4cf0723a | 975 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 976 | |
97f46ae4 FT |
977 | int bsg_register_queue(struct request_queue *q, struct device *parent, |
978 | const char *name, void (*release)(struct device *)) | |
3d6392cf | 979 | { |
598443a2 | 980 | struct bsg_class_device *bcd; |
3d6392cf | 981 | dev_t dev; |
bab998d6 | 982 | int ret; |
ee959b00 | 983 | struct device *class_dev = NULL; |
39dca558 JB |
984 | const char *devname; |
985 | ||
986 | if (name) | |
987 | devname = name; | |
988 | else | |
3ada8b7e | 989 | devname = dev_name(parent); |
3d6392cf JA |
990 | |
991 | /* | |
992 | * we need a proper transport to send commands, not a stacked device | |
993 | */ | |
49fd524f | 994 | if (!queue_is_rq_based(q)) |
3d6392cf JA |
995 | return 0; |
996 | ||
d351af01 | 997 | bcd = &q->bsg_dev; |
3d6392cf | 998 | memset(bcd, 0, sizeof(*bcd)); |
3d6392cf JA |
999 | |
1000 | mutex_lock(&bsg_mutex); | |
292b7f27 | 1001 | |
bab998d6 TH |
1002 | ret = idr_alloc(&bsg_minor_idr, bcd, 0, BSG_MAX_DEVS, GFP_KERNEL); |
1003 | if (ret < 0) { | |
1004 | if (ret == -ENOSPC) { | |
1005 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
1006 | ret = -EINVAL; | |
1007 | } | |
598443a2 | 1008 | goto unlock; |
598443a2 FT |
1009 | } |
1010 | ||
bab998d6 | 1011 | bcd->minor = ret; |
d351af01 | 1012 | bcd->queue = q; |
97f46ae4 FT |
1013 | bcd->parent = get_device(parent); |
1014 | bcd->release = release; | |
1015 | kref_init(&bcd->ref); | |
46f6ef4a | 1016 | dev = MKDEV(bsg_major, bcd->minor); |
1ff9f542 | 1017 | class_dev = device_create(bsg_class, parent, dev, NULL, "%s", devname); |
4e2872d6 FT |
1018 | if (IS_ERR(class_dev)) { |
1019 | ret = PTR_ERR(class_dev); | |
598443a2 | 1020 | goto put_dev; |
4e2872d6 FT |
1021 | } |
1022 | bcd->class_dev = class_dev; | |
1023 | ||
abce891a | 1024 | if (q->kobj.sd) { |
4e2872d6 FT |
1025 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
1026 | if (ret) | |
598443a2 | 1027 | goto unregister_class_dev; |
4e2872d6 FT |
1028 | } |
1029 | ||
3d6392cf JA |
1030 | mutex_unlock(&bsg_mutex); |
1031 | return 0; | |
6826ee4f | 1032 | |
598443a2 | 1033 | unregister_class_dev: |
ee959b00 | 1034 | device_unregister(class_dev); |
598443a2 | 1035 | put_dev: |
97f46ae4 | 1036 | put_device(parent); |
bab998d6 | 1037 | idr_remove(&bsg_minor_idr, bcd->minor); |
598443a2 | 1038 | unlock: |
264a0472 | 1039 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
1040 | return ret; |
1041 | } | |
4cf0723a | 1042 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 | 1043 | |
7e7654a9 | 1044 | static struct cdev bsg_cdev; |
292b7f27 | 1045 | |
2c9ede55 | 1046 | static char *bsg_devnode(struct device *dev, umode_t *mode) |
2bdf9149 KS |
1047 | { |
1048 | return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev)); | |
1049 | } | |
1050 | ||
3d6392cf JA |
1051 | static int __init bsg_init(void) |
1052 | { | |
1053 | int ret, i; | |
46f6ef4a | 1054 | dev_t devid; |
3d6392cf | 1055 | |
5309cb38 | 1056 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83 | 1057 | sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38 JA |
1058 | if (!bsg_cmd_cachep) { |
1059 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1060 | return -ENOMEM; | |
1061 | } | |
1062 | ||
25fd1643 | 1063 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1064 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1065 | ||
1066 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 | 1067 | if (IS_ERR(bsg_class)) { |
9b9f770c FT |
1068 | ret = PTR_ERR(bsg_class); |
1069 | goto destroy_kmemcache; | |
5309cb38 | 1070 | } |
e454cea2 | 1071 | bsg_class->devnode = bsg_devnode; |
3d6392cf | 1072 | |
46f6ef4a | 1073 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
1074 | if (ret) |
1075 | goto destroy_bsg_class; | |
292b7f27 | 1076 | |
46f6ef4a JA |
1077 | bsg_major = MAJOR(devid); |
1078 | ||
292b7f27 | 1079 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 1080 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
1081 | if (ret) |
1082 | goto unregister_chrdev; | |
3d6392cf | 1083 | |
5d3a8cd3 | 1084 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 1085 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 1086 | return 0; |
9b9f770c FT |
1087 | unregister_chrdev: |
1088 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
1089 | destroy_bsg_class: | |
1090 | class_destroy(bsg_class); | |
1091 | destroy_kmemcache: | |
1092 | kmem_cache_destroy(bsg_cmd_cachep); | |
1093 | return ret; | |
3d6392cf JA |
1094 | } |
1095 | ||
1096 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 1097 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
1098 | MODULE_LICENSE("GPL"); |
1099 | ||
4e2872d6 | 1100 | device_initcall(bsg_init); |