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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 | 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 | ||
165125e1 | 139 | static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
abf54393 | 140 | struct sg_io_v4 *hdr, struct bsg_device *bd, |
aeb5d727 | 141 | fmode_t has_write_perm) |
70e36ece | 142 | { |
9f5de6b1 FT |
143 | if (hdr->request_len > BLK_MAX_CDB) { |
144 | rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); | |
145 | if (!rq->cmd) | |
146 | return -ENOMEM; | |
147 | } | |
70e36ece | 148 | |
2b727c63 | 149 | if (copy_from_user(rq->cmd, (void __user *)(unsigned long)hdr->request, |
70e36ece FT |
150 | hdr->request_len)) |
151 | return -EFAULT; | |
15d10b61 FT |
152 | |
153 | if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { | |
018e0446 | 154 | if (blk_verify_command(rq->cmd, has_write_perm)) |
15d10b61 FT |
155 | return -EPERM; |
156 | } else if (!capable(CAP_SYS_RAWIO)) | |
70e36ece FT |
157 | return -EPERM; |
158 | ||
159 | /* | |
160 | * fill in request structure | |
161 | */ | |
162 | rq->cmd_len = hdr->request_len; | |
70e36ece | 163 | |
ad5ebd2f | 164 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
70e36ece FT |
165 | if (!rq->timeout) |
166 | rq->timeout = q->sg_timeout; | |
167 | if (!rq->timeout) | |
168 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
169 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
170 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
70e36ece FT |
171 | |
172 | return 0; | |
173 | } | |
174 | ||
3d6392cf | 175 | /* |
70e36ece | 176 | * Check if sg_io_v4 from user is allowed and valid |
3d6392cf JA |
177 | */ |
178 | static int | |
165125e1 | 179 | bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) |
3d6392cf | 180 | { |
15d10b61 FT |
181 | int ret = 0; |
182 | ||
70e36ece | 183 | if (hdr->guard != 'Q') |
3d6392cf | 184 | return -EINVAL; |
3d6392cf | 185 | |
15d10b61 FT |
186 | switch (hdr->protocol) { |
187 | case BSG_PROTOCOL_SCSI: | |
188 | switch (hdr->subprotocol) { | |
189 | case BSG_SUB_PROTOCOL_SCSI_CMD: | |
190 | case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: | |
191 | break; | |
192 | default: | |
193 | ret = -EINVAL; | |
194 | } | |
195 | break; | |
196 | default: | |
197 | ret = -EINVAL; | |
198 | } | |
70e36ece | 199 | |
70e36ece | 200 | *rw = hdr->dout_xfer_len ? WRITE : READ; |
15d10b61 | 201 | return ret; |
3d6392cf JA |
202 | } |
203 | ||
204 | /* | |
70e36ece | 205 | * map sg_io_v4 to a request. |
3d6392cf JA |
206 | */ |
207 | static struct request * | |
c1c20120 BH |
208 | bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm, |
209 | u8 *sense) | |
3d6392cf | 210 | { |
165125e1 | 211 | struct request_queue *q = bd->queue; |
2c9ecdf4 | 212 | struct request *rq, *next_rq = NULL; |
25fd1643 | 213 | int ret, rw; |
70e36ece | 214 | unsigned int 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 | |
70e36ece | 229 | ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
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 JA |
235 | */ |
236 | rq = blk_get_request(q, rw, GFP_KERNEL); | |
a492f075 JL |
237 | if (IS_ERR(rq)) |
238 | return rq; | |
f27b087b JA |
239 | blk_rq_set_block_pc(rq); |
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 | ||
245 | if (rw == WRITE && hdr->din_xfer_len) { | |
246 | if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { | |
247 | ret = -EOPNOTSUPP; | |
248 | goto out; | |
249 | } | |
250 | ||
251 | next_rq = blk_get_request(q, READ, 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; | |
40f62028 | 258 | next_rq->cmd_type = rq->cmd_type; |
2c9ecdf4 | 259 | |
2b727c63 | 260 | dxferp = (void __user *)(unsigned long)hdr->din_xferp; |
152e283f FT |
261 | ret = blk_rq_map_user(q, next_rq, NULL, dxferp, |
262 | hdr->din_xfer_len, GFP_KERNEL); | |
2c9ecdf4 FT |
263 | if (ret) |
264 | goto out; | |
3d6392cf JA |
265 | } |
266 | ||
70e36ece FT |
267 | if (hdr->dout_xfer_len) { |
268 | dxfer_len = hdr->dout_xfer_len; | |
2b727c63 | 269 | dxferp = (void __user *)(unsigned long)hdr->dout_xferp; |
70e36ece FT |
270 | } else if (hdr->din_xfer_len) { |
271 | dxfer_len = hdr->din_xfer_len; | |
2b727c63 | 272 | dxferp = (void __user *)(unsigned long)hdr->din_xferp; |
70e36ece FT |
273 | } else |
274 | dxfer_len = 0; | |
275 | ||
276 | if (dxfer_len) { | |
152e283f FT |
277 | ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len, |
278 | GFP_KERNEL); | |
2c9ecdf4 FT |
279 | if (ret) |
280 | goto out; | |
3d6392cf | 281 | } |
c1c20120 BH |
282 | |
283 | rq->sense = sense; | |
284 | rq->sense_len = 0; | |
285 | ||
3d6392cf | 286 | return rq; |
2c9ecdf4 | 287 | out: |
9f5de6b1 FT |
288 | if (rq->cmd != rq->__cmd) |
289 | kfree(rq->cmd); | |
2c9ecdf4 FT |
290 | blk_put_request(rq); |
291 | if (next_rq) { | |
292 | blk_rq_unmap_user(next_rq->bio); | |
293 | blk_put_request(next_rq); | |
294 | } | |
295 | return ERR_PTR(ret); | |
3d6392cf JA |
296 | } |
297 | ||
298 | /* | |
299 | * async completion call-back from the block layer, when scsi/ide/whatever | |
300 | * calls end_that_request_last() on a request | |
301 | */ | |
302 | static void bsg_rq_end_io(struct request *rq, int uptodate) | |
303 | { | |
304 | struct bsg_command *bc = rq->end_io_data; | |
305 | struct bsg_device *bd = bc->bd; | |
306 | unsigned long flags; | |
307 | ||
5309cb38 JA |
308 | dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", |
309 | bd->name, rq, bc, bc->bio, uptodate); | |
3d6392cf JA |
310 | |
311 | bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); | |
312 | ||
313 | spin_lock_irqsave(&bd->lock, flags); | |
25fd1643 JA |
314 | list_move_tail(&bc->list, &bd->done_list); |
315 | bd->done_cmds++; | |
3d6392cf | 316 | spin_unlock_irqrestore(&bd->lock, flags); |
25fd1643 JA |
317 | |
318 | wake_up(&bd->wq_done); | |
3d6392cf JA |
319 | } |
320 | ||
321 | /* | |
322 | * do final setup of a 'bc' and submit the matching 'rq' to the block | |
323 | * layer for io | |
324 | */ | |
165125e1 | 325 | static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
3d6392cf JA |
326 | struct bsg_command *bc, struct request *rq) |
327 | { | |
05378940 BH |
328 | int at_head = (0 == (bc->hdr.flags & BSG_FLAG_Q_AT_TAIL)); |
329 | ||
3d6392cf JA |
330 | /* |
331 | * add bc command to busy queue and submit rq for io | |
332 | */ | |
333 | bc->rq = rq; | |
334 | bc->bio = rq->bio; | |
2c9ecdf4 FT |
335 | if (rq->next_rq) |
336 | bc->bidi_bio = rq->next_rq->bio; | |
3d6392cf JA |
337 | bc->hdr.duration = jiffies; |
338 | spin_lock_irq(&bd->lock); | |
339 | list_add_tail(&bc->list, &bd->busy_list); | |
340 | spin_unlock_irq(&bd->lock); | |
341 | ||
342 | dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); | |
343 | ||
344 | rq->end_io_data = bc; | |
05378940 | 345 | blk_execute_rq_nowait(q, NULL, rq, at_head, bsg_rq_end_io); |
3d6392cf JA |
346 | } |
347 | ||
25fd1643 | 348 | static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
349 | { |
350 | struct bsg_command *bc = NULL; | |
351 | ||
352 | spin_lock_irq(&bd->lock); | |
353 | if (bd->done_cmds) { | |
43ac9e62 | 354 | bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
25fd1643 JA |
355 | list_del(&bc->list); |
356 | bd->done_cmds--; | |
3d6392cf JA |
357 | } |
358 | spin_unlock_irq(&bd->lock); | |
359 | ||
360 | return bc; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Get a finished command from the done list | |
365 | */ | |
e7d72173 | 366 | static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cf JA |
367 | { |
368 | struct bsg_command *bc; | |
369 | int ret; | |
370 | ||
371 | do { | |
372 | bc = bsg_next_done_cmd(bd); | |
373 | if (bc) | |
374 | break; | |
375 | ||
e7d72173 FT |
376 | if (!test_bit(BSG_F_BLOCK, &bd->flags)) { |
377 | bc = ERR_PTR(-EAGAIN); | |
378 | break; | |
379 | } | |
380 | ||
381 | ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); | |
3d6392cf | 382 | if (ret) { |
e7d72173 | 383 | bc = ERR_PTR(-ERESTARTSYS); |
3d6392cf JA |
384 | break; |
385 | } | |
386 | } while (1); | |
387 | ||
388 | dprintk("%s: returning done %p\n", bd->name, bc); | |
389 | ||
390 | return bc; | |
391 | } | |
392 | ||
70e36ece | 393 | static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf4 | 394 | struct bio *bio, struct bio *bidi_bio) |
70e36ece FT |
395 | { |
396 | int ret = 0; | |
397 | ||
c1c20120 | 398 | dprintk("rq %p bio %p 0x%x\n", rq, bio, rq->errors); |
70e36ece FT |
399 | /* |
400 | * fill in all the output members | |
401 | */ | |
47897160 | 402 | hdr->device_status = rq->errors & 0xff; |
70e36ece FT |
403 | hdr->transport_status = host_byte(rq->errors); |
404 | hdr->driver_status = driver_byte(rq->errors); | |
405 | hdr->info = 0; | |
406 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
407 | hdr->info |= SG_INFO_CHECK; | |
70e36ece FT |
408 | hdr->response_len = 0; |
409 | ||
410 | if (rq->sense_len && hdr->response) { | |
25fd1643 JA |
411 | int len = min_t(unsigned int, hdr->max_response_len, |
412 | rq->sense_len); | |
70e36ece | 413 | |
2b727c63 | 414 | ret = copy_to_user((void __user *)(unsigned long)hdr->response, |
70e36ece FT |
415 | rq->sense, len); |
416 | if (!ret) | |
417 | hdr->response_len = len; | |
418 | else | |
419 | ret = -EFAULT; | |
420 | } | |
421 | ||
2c9ecdf4 | 422 | if (rq->next_rq) { |
c3a4d78c TH |
423 | hdr->dout_resid = rq->resid_len; |
424 | hdr->din_resid = rq->next_rq->resid_len; | |
2c9ecdf4 FT |
425 | blk_rq_unmap_user(bidi_bio); |
426 | blk_put_request(rq->next_rq); | |
0c6a89ba | 427 | } else if (rq_data_dir(rq) == READ) |
c3a4d78c | 428 | hdr->din_resid = rq->resid_len; |
0c6a89ba | 429 | else |
c3a4d78c | 430 | hdr->dout_resid = rq->resid_len; |
2c9ecdf4 | 431 | |
2d507a01 JB |
432 | /* |
433 | * If the request generated a negative error number, return it | |
434 | * (providing we aren't already returning an error); if it's | |
435 | * just a protocol response (i.e. non negative), that gets | |
436 | * processed above. | |
437 | */ | |
438 | if (!ret && rq->errors < 0) | |
439 | ret = rq->errors; | |
440 | ||
70e36ece | 441 | blk_rq_unmap_user(bio); |
9f5de6b1 FT |
442 | if (rq->cmd != rq->__cmd) |
443 | kfree(rq->cmd); | |
70e36ece FT |
444 | blk_put_request(rq); |
445 | ||
446 | return ret; | |
447 | } | |
448 | ||
2c561246 PZ |
449 | static bool bsg_complete(struct bsg_device *bd) |
450 | { | |
451 | bool ret = false; | |
452 | bool spin; | |
453 | ||
454 | do { | |
455 | spin_lock_irq(&bd->lock); | |
456 | ||
457 | BUG_ON(bd->done_cmds > bd->queued_cmds); | |
458 | ||
459 | /* | |
460 | * All commands consumed. | |
461 | */ | |
462 | if (bd->done_cmds == bd->queued_cmds) | |
463 | ret = true; | |
464 | ||
465 | spin = !test_bit(BSG_F_BLOCK, &bd->flags); | |
466 | ||
467 | spin_unlock_irq(&bd->lock); | |
468 | } while (!ret && spin); | |
469 | ||
470 | return ret; | |
471 | } | |
472 | ||
3d6392cf JA |
473 | static int bsg_complete_all_commands(struct bsg_device *bd) |
474 | { | |
475 | struct bsg_command *bc; | |
476 | int ret, tret; | |
477 | ||
478 | dprintk("%s: entered\n", bd->name); | |
479 | ||
3d6392cf JA |
480 | /* |
481 | * wait for all commands to complete | |
482 | */ | |
2c561246 | 483 | io_wait_event(bd->wq_done, bsg_complete(bd)); |
3d6392cf JA |
484 | |
485 | /* | |
486 | * discard done commands | |
487 | */ | |
488 | ret = 0; | |
489 | do { | |
e7d72173 FT |
490 | spin_lock_irq(&bd->lock); |
491 | if (!bd->queued_cmds) { | |
492 | spin_unlock_irq(&bd->lock); | |
3d6392cf JA |
493 | break; |
494 | } | |
efba1a31 | 495 | spin_unlock_irq(&bd->lock); |
3d6392cf | 496 | |
e7d72173 FT |
497 | bc = bsg_get_done_cmd(bd); |
498 | if (IS_ERR(bc)) | |
499 | break; | |
500 | ||
2c9ecdf4 FT |
501 | tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
502 | bc->bidi_bio); | |
3d6392cf JA |
503 | if (!ret) |
504 | ret = tret; | |
505 | ||
506 | bsg_free_command(bc); | |
507 | } while (1); | |
508 | ||
509 | return ret; | |
510 | } | |
511 | ||
25fd1643 | 512 | static int |
e7d72173 FT |
513 | __bsg_read(char __user *buf, size_t count, struct bsg_device *bd, |
514 | const struct iovec *iov, ssize_t *bytes_read) | |
3d6392cf JA |
515 | { |
516 | struct bsg_command *bc; | |
517 | int nr_commands, ret; | |
518 | ||
70e36ece | 519 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
520 | return -EINVAL; |
521 | ||
522 | ret = 0; | |
70e36ece | 523 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf | 524 | while (nr_commands) { |
e7d72173 | 525 | bc = bsg_get_done_cmd(bd); |
3d6392cf JA |
526 | if (IS_ERR(bc)) { |
527 | ret = PTR_ERR(bc); | |
528 | break; | |
529 | } | |
530 | ||
531 | /* | |
532 | * this is the only case where we need to copy data back | |
533 | * after completing the request. so do that here, | |
534 | * bsg_complete_work() cannot do that for us | |
535 | */ | |
2c9ecdf4 FT |
536 | ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, |
537 | bc->bidi_bio); | |
3d6392cf | 538 | |
25fd1643 | 539 | if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cf JA |
540 | ret = -EFAULT; |
541 | ||
542 | bsg_free_command(bc); | |
543 | ||
544 | if (ret) | |
545 | break; | |
546 | ||
70e36ece FT |
547 | buf += sizeof(struct sg_io_v4); |
548 | *bytes_read += sizeof(struct sg_io_v4); | |
3d6392cf JA |
549 | nr_commands--; |
550 | } | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
555 | static inline void bsg_set_block(struct bsg_device *bd, struct file *file) | |
556 | { | |
557 | if (file->f_flags & O_NONBLOCK) | |
558 | clear_bit(BSG_F_BLOCK, &bd->flags); | |
559 | else | |
560 | set_bit(BSG_F_BLOCK, &bd->flags); | |
561 | } | |
562 | ||
25fd1643 JA |
563 | /* |
564 | * Check if the error is a "real" error that we should return. | |
565 | */ | |
3d6392cf JA |
566 | static inline int err_block_err(int ret) |
567 | { | |
568 | if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) | |
569 | return 1; | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | static ssize_t | |
575 | bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
576 | { | |
577 | struct bsg_device *bd = file->private_data; | |
578 | int ret; | |
579 | ssize_t bytes_read; | |
580 | ||
9e69fbb5 | 581 | dprintk("%s: read %Zd bytes\n", bd->name, count); |
3d6392cf JA |
582 | |
583 | bsg_set_block(bd, file); | |
0b07de85 | 584 | |
3d6392cf | 585 | bytes_read = 0; |
e7d72173 | 586 | ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cf JA |
587 | *ppos = bytes_read; |
588 | ||
44194e3e | 589 | if (!bytes_read || err_block_err(ret)) |
3d6392cf JA |
590 | bytes_read = ret; |
591 | ||
592 | return bytes_read; | |
593 | } | |
594 | ||
25fd1643 | 595 | static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
aeb5d727 AV |
596 | size_t count, ssize_t *bytes_written, |
597 | fmode_t has_write_perm) | |
3d6392cf JA |
598 | { |
599 | struct bsg_command *bc; | |
600 | struct request *rq; | |
601 | int ret, nr_commands; | |
602 | ||
70e36ece | 603 | if (count % sizeof(struct sg_io_v4)) |
3d6392cf JA |
604 | return -EINVAL; |
605 | ||
70e36ece | 606 | nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cf JA |
607 | rq = NULL; |
608 | bc = NULL; | |
609 | ret = 0; | |
610 | while (nr_commands) { | |
165125e1 | 611 | struct request_queue *q = bd->queue; |
3d6392cf | 612 | |
e7d72173 | 613 | bc = bsg_alloc_command(bd); |
3d6392cf JA |
614 | if (IS_ERR(bc)) { |
615 | ret = PTR_ERR(bc); | |
616 | bc = NULL; | |
617 | break; | |
618 | } | |
619 | ||
3d6392cf JA |
620 | if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { |
621 | ret = -EFAULT; | |
622 | break; | |
623 | } | |
624 | ||
625 | /* | |
626 | * get a request, fill in the blanks, and add to request queue | |
627 | */ | |
c1c20120 | 628 | rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm, bc->sense); |
3d6392cf JA |
629 | if (IS_ERR(rq)) { |
630 | ret = PTR_ERR(rq); | |
631 | rq = NULL; | |
632 | break; | |
633 | } | |
634 | ||
635 | bsg_add_command(bd, q, bc, rq); | |
636 | bc = NULL; | |
637 | rq = NULL; | |
638 | nr_commands--; | |
70e36ece | 639 | buf += sizeof(struct sg_io_v4); |
25fd1643 | 640 | *bytes_written += sizeof(struct sg_io_v4); |
3d6392cf JA |
641 | } |
642 | ||
3d6392cf JA |
643 | if (bc) |
644 | bsg_free_command(bc); | |
645 | ||
646 | return ret; | |
647 | } | |
648 | ||
649 | static ssize_t | |
650 | bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
651 | { | |
652 | struct bsg_device *bd = file->private_data; | |
25fd1643 | 653 | ssize_t bytes_written; |
3d6392cf JA |
654 | int ret; |
655 | ||
9e69fbb5 | 656 | dprintk("%s: write %Zd bytes\n", bd->name, count); |
3d6392cf JA |
657 | |
658 | bsg_set_block(bd, file); | |
3d6392cf | 659 | |
25fd1643 | 660 | bytes_written = 0; |
abf54393 FT |
661 | ret = __bsg_write(bd, buf, count, &bytes_written, |
662 | file->f_mode & FMODE_WRITE); | |
663 | ||
25fd1643 | 664 | *ppos = bytes_written; |
3d6392cf JA |
665 | |
666 | /* | |
667 | * return bytes written on non-fatal errors | |
668 | */ | |
44194e3e | 669 | if (!bytes_written || err_block_err(ret)) |
25fd1643 | 670 | bytes_written = ret; |
3d6392cf | 671 | |
25fd1643 JA |
672 | dprintk("%s: returning %Zd\n", bd->name, bytes_written); |
673 | return bytes_written; | |
3d6392cf JA |
674 | } |
675 | ||
3d6392cf JA |
676 | static struct bsg_device *bsg_alloc_device(void) |
677 | { | |
3d6392cf | 678 | struct bsg_device *bd; |
3d6392cf JA |
679 | |
680 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
681 | if (unlikely(!bd)) | |
682 | return NULL; | |
683 | ||
684 | spin_lock_init(&bd->lock); | |
685 | ||
5309cb38 | 686 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf JA |
687 | |
688 | INIT_LIST_HEAD(&bd->busy_list); | |
689 | INIT_LIST_HEAD(&bd->done_list); | |
690 | INIT_HLIST_NODE(&bd->dev_list); | |
691 | ||
692 | init_waitqueue_head(&bd->wq_free); | |
693 | init_waitqueue_head(&bd->wq_done); | |
694 | return bd; | |
3d6392cf JA |
695 | } |
696 | ||
97f46ae4 FT |
697 | static void bsg_kref_release_function(struct kref *kref) |
698 | { | |
699 | struct bsg_class_device *bcd = | |
700 | container_of(kref, struct bsg_class_device, ref); | |
8df5fc04 | 701 | struct device *parent = bcd->parent; |
97f46ae4 FT |
702 | |
703 | if (bcd->release) | |
704 | bcd->release(bcd->parent); | |
705 | ||
8df5fc04 | 706 | put_device(parent); |
97f46ae4 FT |
707 | } |
708 | ||
3d6392cf JA |
709 | static int bsg_put_device(struct bsg_device *bd) |
710 | { | |
97f46ae4 FT |
711 | int ret = 0, do_free; |
712 | struct request_queue *q = bd->queue; | |
3d6392cf JA |
713 | |
714 | mutex_lock(&bsg_mutex); | |
715 | ||
97f46ae4 | 716 | do_free = atomic_dec_and_test(&bd->ref_count); |
3f27e3ed FT |
717 | if (!do_free) { |
718 | mutex_unlock(&bsg_mutex); | |
3d6392cf | 719 | goto out; |
3f27e3ed FT |
720 | } |
721 | ||
722 | hlist_del(&bd->dev_list); | |
723 | mutex_unlock(&bsg_mutex); | |
3d6392cf JA |
724 | |
725 | dprintk("%s: tearing down\n", bd->name); | |
726 | ||
727 | /* | |
728 | * close can always block | |
729 | */ | |
730 | set_bit(BSG_F_BLOCK, &bd->flags); | |
731 | ||
732 | /* | |
733 | * correct error detection baddies here again. it's the responsibility | |
734 | * of the app to properly reap commands before close() if it wants | |
735 | * fool-proof error detection | |
736 | */ | |
737 | ret = bsg_complete_all_commands(bd); | |
738 | ||
5309cb38 | 739 | kfree(bd); |
3d6392cf | 740 | out: |
97f46ae4 FT |
741 | kref_put(&q->bsg_dev.ref, bsg_kref_release_function); |
742 | if (do_free) | |
743 | blk_put_queue(q); | |
3d6392cf JA |
744 | return ret; |
745 | } | |
746 | ||
747 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 748 | struct request_queue *rq, |
3d6392cf JA |
749 | struct file *file) |
750 | { | |
25fd1643 | 751 | struct bsg_device *bd; |
3d6392cf JA |
752 | #ifdef BSG_DEBUG |
753 | unsigned char buf[32]; | |
754 | #endif | |
09ac46c4 | 755 | if (!blk_get_queue(rq)) |
c3ff1b90 | 756 | return ERR_PTR(-ENXIO); |
3d6392cf JA |
757 | |
758 | bd = bsg_alloc_device(); | |
c3ff1b90 FT |
759 | if (!bd) { |
760 | blk_put_queue(rq); | |
3d6392cf | 761 | return ERR_PTR(-ENOMEM); |
c3ff1b90 | 762 | } |
3d6392cf | 763 | |
d351af01 | 764 | bd->queue = rq; |
0b07de85 | 765 | |
3d6392cf JA |
766 | bsg_set_block(bd, file); |
767 | ||
768 | atomic_set(&bd->ref_count, 1); | |
3d6392cf | 769 | mutex_lock(&bsg_mutex); |
842ea771 | 770 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cf | 771 | |
3ada8b7e | 772 | strncpy(bd->name, dev_name(rq->bsg_dev.class_dev), sizeof(bd->name) - 1); |
3d6392cf | 773 | dprintk("bound to <%s>, max queue %d\n", |
9e69fbb5 | 774 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf JA |
775 | |
776 | mutex_unlock(&bsg_mutex); | |
777 | return bd; | |
778 | } | |
779 | ||
842ea771 | 780 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cf | 781 | { |
43ac9e62 | 782 | struct bsg_device *bd; |
3d6392cf JA |
783 | |
784 | mutex_lock(&bsg_mutex); | |
785 | ||
b67bfe0d | 786 | hlist_for_each_entry(bd, bsg_dev_idx_hash(minor), dev_list) { |
842ea771 | 787 | if (bd->queue == q) { |
3d6392cf | 788 | atomic_inc(&bd->ref_count); |
43ac9e62 | 789 | goto found; |
3d6392cf | 790 | } |
3d6392cf | 791 | } |
43ac9e62 FT |
792 | bd = NULL; |
793 | found: | |
3d6392cf JA |
794 | mutex_unlock(&bsg_mutex); |
795 | return bd; | |
796 | } | |
797 | ||
798 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
799 | { | |
598443a2 FT |
800 | struct bsg_device *bd; |
801 | struct bsg_class_device *bcd; | |
3d6392cf | 802 | |
3d6392cf JA |
803 | /* |
804 | * find the class device | |
805 | */ | |
3d6392cf | 806 | mutex_lock(&bsg_mutex); |
598443a2 | 807 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
d45ac4fa | 808 | if (bcd) |
97f46ae4 | 809 | kref_get(&bcd->ref); |
3d6392cf JA |
810 | mutex_unlock(&bsg_mutex); |
811 | ||
812 | if (!bcd) | |
813 | return ERR_PTR(-ENODEV); | |
814 | ||
842ea771 | 815 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
d45ac4fa FT |
816 | if (bd) |
817 | return bd; | |
818 | ||
819 | bd = bsg_add_device(inode, bcd->queue, file); | |
820 | if (IS_ERR(bd)) | |
97f46ae4 | 821 | kref_put(&bcd->ref, bsg_kref_release_function); |
d45ac4fa FT |
822 | |
823 | return bd; | |
3d6392cf JA |
824 | } |
825 | ||
826 | static int bsg_open(struct inode *inode, struct file *file) | |
827 | { | |
75bd2ef1 JC |
828 | struct bsg_device *bd; |
829 | ||
75bd2ef1 | 830 | bd = bsg_get_device(inode, file); |
3d6392cf JA |
831 | |
832 | if (IS_ERR(bd)) | |
833 | return PTR_ERR(bd); | |
834 | ||
835 | file->private_data = bd; | |
836 | return 0; | |
837 | } | |
838 | ||
839 | static int bsg_release(struct inode *inode, struct file *file) | |
840 | { | |
841 | struct bsg_device *bd = file->private_data; | |
842 | ||
843 | file->private_data = NULL; | |
844 | return bsg_put_device(bd); | |
845 | } | |
846 | ||
847 | static unsigned int bsg_poll(struct file *file, poll_table *wait) | |
848 | { | |
849 | struct bsg_device *bd = file->private_data; | |
850 | unsigned int mask = 0; | |
851 | ||
852 | poll_wait(file, &bd->wq_done, wait); | |
853 | poll_wait(file, &bd->wq_free, wait); | |
854 | ||
855 | spin_lock_irq(&bd->lock); | |
856 | if (!list_empty(&bd->done_list)) | |
857 | mask |= POLLIN | POLLRDNORM; | |
80ceb057 | 858 | if (bd->queued_cmds < bd->max_queue) |
3d6392cf JA |
859 | mask |= POLLOUT; |
860 | spin_unlock_irq(&bd->lock); | |
861 | ||
862 | return mask; | |
863 | } | |
864 | ||
25fd1643 | 865 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
866 | { |
867 | struct bsg_device *bd = file->private_data; | |
868 | int __user *uarg = (int __user *) arg; | |
2d507a01 | 869 | int ret; |
3d6392cf | 870 | |
3d6392cf JA |
871 | switch (cmd) { |
872 | /* | |
873 | * our own ioctls | |
874 | */ | |
875 | case SG_GET_COMMAND_Q: | |
876 | return put_user(bd->max_queue, uarg); | |
5309cb38 | 877 | case SG_SET_COMMAND_Q: { |
3d6392cf JA |
878 | int queue; |
879 | ||
880 | if (get_user(queue, uarg)) | |
881 | return -EFAULT; | |
5309cb38 | 882 | if (queue < 1) |
3d6392cf JA |
883 | return -EINVAL; |
884 | ||
5309cb38 | 885 | spin_lock_irq(&bd->lock); |
3d6392cf | 886 | bd->max_queue = queue; |
5309cb38 | 887 | spin_unlock_irq(&bd->lock); |
3d6392cf JA |
888 | return 0; |
889 | } | |
890 | ||
891 | /* | |
892 | * SCSI/sg ioctls | |
893 | */ | |
894 | case SG_GET_VERSION_NUM: | |
895 | case SCSI_IOCTL_GET_IDLUN: | |
896 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
897 | case SG_SET_TIMEOUT: | |
898 | case SG_GET_TIMEOUT: | |
899 | case SG_GET_RESERVED_SIZE: | |
900 | case SG_SET_RESERVED_SIZE: | |
901 | case SG_EMULATED_HOST: | |
3d6392cf JA |
902 | case SCSI_IOCTL_SEND_COMMAND: { |
903 | void __user *uarg = (void __user *) arg; | |
74f3c8af | 904 | return scsi_cmd_ioctl(bd->queue, NULL, file->f_mode, cmd, uarg); |
3d6392cf | 905 | } |
10e8855b FT |
906 | case SG_IO: { |
907 | struct request *rq; | |
2c9ecdf4 | 908 | struct bio *bio, *bidi_bio = NULL; |
10e8855b | 909 | struct sg_io_v4 hdr; |
05378940 | 910 | int at_head; |
c1c20120 | 911 | u8 sense[SCSI_SENSE_BUFFERSIZE]; |
10e8855b FT |
912 | |
913 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) | |
914 | return -EFAULT; | |
915 | ||
c1c20120 | 916 | rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE, sense); |
10e8855b FT |
917 | if (IS_ERR(rq)) |
918 | return PTR_ERR(rq); | |
919 | ||
920 | bio = rq->bio; | |
2c9ecdf4 FT |
921 | if (rq->next_rq) |
922 | bidi_bio = rq->next_rq->bio; | |
05378940 BH |
923 | |
924 | at_head = (0 == (hdr.flags & BSG_FLAG_Q_AT_TAIL)); | |
925 | blk_execute_rq(bd->queue, NULL, rq, at_head); | |
2d507a01 | 926 | ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b FT |
927 | |
928 | if (copy_to_user(uarg, &hdr, sizeof(hdr))) | |
929 | return -EFAULT; | |
b711afa6 | 930 | |
2d507a01 | 931 | return ret; |
10e8855b | 932 | } |
3d6392cf JA |
933 | /* |
934 | * block device ioctls | |
935 | */ | |
936 | default: | |
937 | #if 0 | |
938 | return ioctl_by_bdev(bd->bdev, cmd, arg); | |
939 | #else | |
940 | return -ENOTTY; | |
941 | #endif | |
942 | } | |
943 | } | |
944 | ||
7344be05 | 945 | static const struct file_operations bsg_fops = { |
3d6392cf JA |
946 | .read = bsg_read, |
947 | .write = bsg_write, | |
948 | .poll = bsg_poll, | |
949 | .open = bsg_open, | |
950 | .release = bsg_release, | |
25fd1643 | 951 | .unlocked_ioctl = bsg_ioctl, |
3d6392cf | 952 | .owner = THIS_MODULE, |
6038f373 | 953 | .llseek = default_llseek, |
3d6392cf JA |
954 | }; |
955 | ||
d351af01 | 956 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 957 | { |
d351af01 | 958 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 959 | |
df468820 FT |
960 | if (!bcd->class_dev) |
961 | return; | |
3d6392cf JA |
962 | |
963 | mutex_lock(&bsg_mutex); | |
598443a2 | 964 | idr_remove(&bsg_minor_idr, bcd->minor); |
37b40adf SG |
965 | if (q->kobj.sd) |
966 | sysfs_remove_link(&q->kobj, "bsg"); | |
ee959b00 | 967 | device_unregister(bcd->class_dev); |
3d6392cf | 968 | bcd->class_dev = NULL; |
97f46ae4 | 969 | kref_put(&bcd->ref, bsg_kref_release_function); |
3d6392cf JA |
970 | mutex_unlock(&bsg_mutex); |
971 | } | |
4cf0723a | 972 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 973 | |
97f46ae4 FT |
974 | int bsg_register_queue(struct request_queue *q, struct device *parent, |
975 | const char *name, void (*release)(struct device *)) | |
3d6392cf | 976 | { |
598443a2 | 977 | struct bsg_class_device *bcd; |
3d6392cf | 978 | dev_t dev; |
bab998d6 | 979 | int ret; |
ee959b00 | 980 | struct device *class_dev = NULL; |
39dca558 JB |
981 | const char *devname; |
982 | ||
983 | if (name) | |
984 | devname = name; | |
985 | else | |
3ada8b7e | 986 | devname = dev_name(parent); |
3d6392cf JA |
987 | |
988 | /* | |
989 | * we need a proper transport to send commands, not a stacked device | |
990 | */ | |
49fd524f | 991 | if (!queue_is_rq_based(q)) |
3d6392cf JA |
992 | return 0; |
993 | ||
d351af01 | 994 | bcd = &q->bsg_dev; |
3d6392cf | 995 | memset(bcd, 0, sizeof(*bcd)); |
3d6392cf JA |
996 | |
997 | mutex_lock(&bsg_mutex); | |
292b7f27 | 998 | |
bab998d6 TH |
999 | ret = idr_alloc(&bsg_minor_idr, bcd, 0, BSG_MAX_DEVS, GFP_KERNEL); |
1000 | if (ret < 0) { | |
1001 | if (ret == -ENOSPC) { | |
1002 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
1003 | ret = -EINVAL; | |
1004 | } | |
598443a2 | 1005 | goto unlock; |
598443a2 FT |
1006 | } |
1007 | ||
bab998d6 | 1008 | bcd->minor = ret; |
d351af01 | 1009 | bcd->queue = q; |
97f46ae4 FT |
1010 | bcd->parent = get_device(parent); |
1011 | bcd->release = release; | |
1012 | kref_init(&bcd->ref); | |
46f6ef4a | 1013 | dev = MKDEV(bsg_major, bcd->minor); |
1ff9f542 | 1014 | class_dev = device_create(bsg_class, parent, dev, NULL, "%s", devname); |
4e2872d6 FT |
1015 | if (IS_ERR(class_dev)) { |
1016 | ret = PTR_ERR(class_dev); | |
598443a2 | 1017 | goto put_dev; |
4e2872d6 FT |
1018 | } |
1019 | bcd->class_dev = class_dev; | |
1020 | ||
abce891a | 1021 | if (q->kobj.sd) { |
4e2872d6 FT |
1022 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
1023 | if (ret) | |
598443a2 | 1024 | goto unregister_class_dev; |
4e2872d6 FT |
1025 | } |
1026 | ||
3d6392cf JA |
1027 | mutex_unlock(&bsg_mutex); |
1028 | return 0; | |
6826ee4f | 1029 | |
598443a2 | 1030 | unregister_class_dev: |
ee959b00 | 1031 | device_unregister(class_dev); |
598443a2 | 1032 | put_dev: |
97f46ae4 | 1033 | put_device(parent); |
bab998d6 | 1034 | idr_remove(&bsg_minor_idr, bcd->minor); |
598443a2 | 1035 | unlock: |
264a0472 | 1036 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
1037 | return ret; |
1038 | } | |
4cf0723a | 1039 | EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6 | 1040 | |
7e7654a9 | 1041 | static struct cdev bsg_cdev; |
292b7f27 | 1042 | |
2c9ede55 | 1043 | static char *bsg_devnode(struct device *dev, umode_t *mode) |
2bdf9149 KS |
1044 | { |
1045 | return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev)); | |
1046 | } | |
1047 | ||
3d6392cf JA |
1048 | static int __init bsg_init(void) |
1049 | { | |
1050 | int ret, i; | |
46f6ef4a | 1051 | dev_t devid; |
3d6392cf | 1052 | |
5309cb38 | 1053 | bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83 | 1054 | sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38 JA |
1055 | if (!bsg_cmd_cachep) { |
1056 | printk(KERN_ERR "bsg: failed creating slab cache\n"); | |
1057 | return -ENOMEM; | |
1058 | } | |
1059 | ||
25fd1643 | 1060 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
1061 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
1062 | ||
1063 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
5309cb38 | 1064 | if (IS_ERR(bsg_class)) { |
9b9f770c FT |
1065 | ret = PTR_ERR(bsg_class); |
1066 | goto destroy_kmemcache; | |
5309cb38 | 1067 | } |
e454cea2 | 1068 | bsg_class->devnode = bsg_devnode; |
3d6392cf | 1069 | |
46f6ef4a | 1070 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
1071 | if (ret) |
1072 | goto destroy_bsg_class; | |
292b7f27 | 1073 | |
46f6ef4a JA |
1074 | bsg_major = MAJOR(devid); |
1075 | ||
292b7f27 | 1076 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 1077 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
1078 | if (ret) |
1079 | goto unregister_chrdev; | |
3d6392cf | 1080 | |
5d3a8cd3 | 1081 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 1082 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 1083 | return 0; |
9b9f770c FT |
1084 | unregister_chrdev: |
1085 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
1086 | destroy_bsg_class: | |
1087 | class_destroy(bsg_class); | |
1088 | destroy_kmemcache: | |
1089 | kmem_cache_destroy(bsg_cmd_cachep); | |
1090 | return ret; | |
3d6392cf JA |
1091 | } |
1092 | ||
1093 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 1094 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
1095 | MODULE_LICENSE("GPL"); |
1096 | ||
4e2872d6 | 1097 | device_initcall(bsg_init); |