Commit | Line | Data |
---|---|---|
8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d6392cf | 2 | /* |
0c6a89ba | 3 | * bsg.c - block layer implementation of the sg v4 interface |
3d6392cf | 4 | */ |
3d6392cf JA |
5 | #include <linux/module.h> |
6 | #include <linux/init.h> | |
7 | #include <linux/file.h> | |
8 | #include <linux/blkdev.h> | |
3d6392cf | 9 | #include <linux/cdev.h> |
ad5ebd2f | 10 | #include <linux/jiffies.h> |
3d6392cf | 11 | #include <linux/percpu.h> |
598443a2 | 12 | #include <linux/idr.h> |
3d6392cf | 13 | #include <linux/bsg.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
3d6392cf JA |
15 | |
16 | #include <scsi/scsi.h> | |
17 | #include <scsi/scsi_ioctl.h> | |
18 | #include <scsi/scsi_cmnd.h> | |
4e2872d6 FT |
19 | #include <scsi/scsi_device.h> |
20 | #include <scsi/scsi_driver.h> | |
3d6392cf JA |
21 | #include <scsi/sg.h> |
22 | ||
0ed081ce FT |
23 | #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" |
24 | #define BSG_VERSION "0.4" | |
3d6392cf | 25 | |
3124b65d JT |
26 | #define bsg_dbg(bd, fmt, ...) \ |
27 | pr_debug("%s: " fmt, (bd)->name, ##__VA_ARGS__) | |
28 | ||
3d6392cf | 29 | struct bsg_device { |
165125e1 | 30 | struct request_queue *queue; |
3d6392cf | 31 | spinlock_t lock; |
3d6392cf | 32 | struct hlist_node dev_list; |
db193954 | 33 | refcount_t ref_count; |
3ada8b7e | 34 | char name[20]; |
3d6392cf | 35 | int max_queue; |
3d6392cf JA |
36 | }; |
37 | ||
5309cb38 | 38 | #define BSG_DEFAULT_CMDS 64 |
292b7f27 | 39 | #define BSG_MAX_DEVS 32768 |
3d6392cf | 40 | |
3d6392cf | 41 | static DEFINE_MUTEX(bsg_mutex); |
598443a2 | 42 | static DEFINE_IDR(bsg_minor_idr); |
3d6392cf | 43 | |
25fd1643 | 44 | #define BSG_LIST_ARRAY_SIZE 8 |
25fd1643 | 45 | static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
3d6392cf JA |
46 | |
47 | static struct class *bsg_class; | |
46f6ef4a | 48 | static int bsg_major; |
3d6392cf | 49 | |
1c1133e1 | 50 | static inline struct hlist_head *bsg_dev_idx_hash(int index) |
3d6392cf | 51 | { |
1c1133e1 | 52 | return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cf JA |
53 | } |
54 | ||
17cb960f CH |
55 | #define uptr64(val) ((void __user *)(uintptr_t)(val)) |
56 | ||
57 | static int bsg_scsi_check_proto(struct sg_io_v4 *hdr) | |
58 | { | |
59 | if (hdr->protocol != BSG_PROTOCOL_SCSI || | |
60 | hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_CMD) | |
61 | return -EINVAL; | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static int bsg_scsi_fill_hdr(struct request *rq, struct sg_io_v4 *hdr, | |
66 | fmode_t mode) | |
70e36ece | 67 | { |
17cb960f | 68 | struct scsi_request *sreq = scsi_req(rq); |
82ed4db4 | 69 | |
972248e9 CH |
70 | if (hdr->dout_xfer_len && hdr->din_xfer_len) { |
71 | pr_warn_once("BIDI support in bsg has been removed.\n"); | |
72 | return -EOPNOTSUPP; | |
73 | } | |
74 | ||
17cb960f CH |
75 | sreq->cmd_len = hdr->request_len; |
76 | if (sreq->cmd_len > BLK_MAX_CDB) { | |
77 | sreq->cmd = kzalloc(sreq->cmd_len, GFP_KERNEL); | |
78 | if (!sreq->cmd) | |
9f5de6b1 FT |
79 | return -ENOMEM; |
80 | } | |
70e36ece | 81 | |
17cb960f | 82 | if (copy_from_user(sreq->cmd, uptr64(hdr->request), sreq->cmd_len)) |
70e36ece | 83 | return -EFAULT; |
17cb960f | 84 | if (blk_verify_command(sreq->cmd, mode)) |
70e36ece | 85 | return -EPERM; |
70e36ece FT |
86 | return 0; |
87 | } | |
88 | ||
17cb960f | 89 | static int bsg_scsi_complete_rq(struct request *rq, struct sg_io_v4 *hdr) |
3d6392cf | 90 | { |
17cb960f | 91 | struct scsi_request *sreq = scsi_req(rq); |
15d10b61 FT |
92 | int ret = 0; |
93 | ||
17cb960f CH |
94 | /* |
95 | * fill in all the output members | |
96 | */ | |
97 | hdr->device_status = sreq->result & 0xff; | |
98 | hdr->transport_status = host_byte(sreq->result); | |
54c29086 | 99 | hdr->driver_status = 0; |
464a00c9 HR |
100 | if (scsi_status_is_check_condition(sreq->result)) |
101 | hdr->driver_status = DRIVER_SENSE; | |
17cb960f CH |
102 | hdr->info = 0; |
103 | if (hdr->device_status || hdr->transport_status || hdr->driver_status) | |
104 | hdr->info |= SG_INFO_CHECK; | |
105 | hdr->response_len = 0; | |
3d6392cf | 106 | |
17cb960f CH |
107 | if (sreq->sense_len && hdr->response) { |
108 | int len = min_t(unsigned int, hdr->max_response_len, | |
109 | sreq->sense_len); | |
110 | ||
111 | if (copy_to_user(uptr64(hdr->response), sreq->sense, len)) | |
112 | ret = -EFAULT; | |
113 | else | |
114 | hdr->response_len = len; | |
115 | } | |
116 | ||
972248e9 | 117 | if (rq_data_dir(rq) == READ) |
17cb960f | 118 | hdr->din_resid = sreq->resid_len; |
972248e9 | 119 | else |
17cb960f | 120 | hdr->dout_resid = sreq->resid_len; |
70e36ece | 121 | |
15d10b61 | 122 | return ret; |
3d6392cf JA |
123 | } |
124 | ||
17cb960f CH |
125 | static void bsg_scsi_free_rq(struct request *rq) |
126 | { | |
127 | scsi_req_free_cmd(scsi_req(rq)); | |
128 | } | |
129 | ||
130 | static const struct bsg_ops bsg_scsi_ops = { | |
131 | .check_proto = bsg_scsi_check_proto, | |
132 | .fill_hdr = bsg_scsi_fill_hdr, | |
133 | .complete_rq = bsg_scsi_complete_rq, | |
134 | .free_rq = bsg_scsi_free_rq, | |
135 | }; | |
136 | ||
ccf3209f | 137 | static int bsg_sg_io(struct request_queue *q, fmode_t mode, void __user *uarg) |
3d6392cf | 138 | { |
972248e9 CH |
139 | struct request *rq; |
140 | struct bio *bio; | |
ccf3209f | 141 | struct sg_io_v4 hdr; |
aebf526b | 142 | int ret; |
c7a841f3 | 143 | |
ccf3209f CH |
144 | if (copy_from_user(&hdr, uarg, sizeof(hdr))) |
145 | return -EFAULT; | |
3d6392cf | 146 | |
ccf3209f CH |
147 | if (!q->bsg_dev.class_dev) |
148 | return -ENXIO; | |
3d6392cf | 149 | |
ccf3209f CH |
150 | if (hdr.guard != 'Q') |
151 | return -EINVAL; | |
152 | ret = q->bsg_dev.ops->check_proto(&hdr); | |
3d6392cf | 153 | if (ret) |
ccf3209f | 154 | return ret; |
3d6392cf | 155 | |
ccf3209f | 156 | rq = blk_get_request(q, hdr.dout_xfer_len ? |
da6269da | 157 | REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); |
a492f075 | 158 | if (IS_ERR(rq)) |
ccf3209f | 159 | return PTR_ERR(rq); |
f27b087b | 160 | |
ccf3209f | 161 | ret = q->bsg_dev.ops->fill_hdr(rq, &hdr, mode); |
0f7b4bc6 PB |
162 | if (ret) { |
163 | blk_put_request(rq); | |
972248e9 | 164 | return ret; |
0f7b4bc6 | 165 | } |
2c9ecdf4 | 166 | |
ccf3209f | 167 | rq->timeout = msecs_to_jiffies(hdr.timeout); |
17cb960f CH |
168 | if (!rq->timeout) |
169 | rq->timeout = q->sg_timeout; | |
170 | if (!rq->timeout) | |
171 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
172 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) | |
173 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
174 | ||
ccf3209f CH |
175 | if (hdr.dout_xfer_len) { |
176 | ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr.dout_xferp), | |
177 | hdr.dout_xfer_len, GFP_KERNEL); | |
178 | } else if (hdr.din_xfer_len) { | |
179 | ret = blk_rq_map_user(q, rq, NULL, uptr64(hdr.din_xferp), | |
180 | hdr.din_xfer_len, GFP_KERNEL); | |
3d6392cf | 181 | } |
c1c20120 | 182 | |
17cb960f | 183 | if (ret) |
972248e9 | 184 | goto out_free_rq; |
17cb960f | 185 | |
ccf3209f | 186 | bio = rq->bio; |
70e36ece | 187 | |
684da762 | 188 | blk_execute_rq(NULL, rq, !(hdr.flags & BSG_FLAG_Q_AT_TAIL)); |
ccf3209f | 189 | ret = rq->q->bsg_dev.ops->complete_rq(rq, &hdr); |
70e36ece | 190 | blk_rq_unmap_user(bio); |
972248e9 CH |
191 | |
192 | out_free_rq: | |
17cb960f | 193 | rq->q->bsg_dev.ops->free_rq(rq); |
70e36ece | 194 | blk_put_request(rq); |
972248e9 | 195 | if (!ret && copy_to_user(uarg, &hdr, sizeof(hdr))) |
ccf3209f CH |
196 | return -EFAULT; |
197 | return ret; | |
70e36ece FT |
198 | } |
199 | ||
3d6392cf JA |
200 | static struct bsg_device *bsg_alloc_device(void) |
201 | { | |
3d6392cf | 202 | struct bsg_device *bd; |
3d6392cf JA |
203 | |
204 | bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); | |
205 | if (unlikely(!bd)) | |
206 | return NULL; | |
207 | ||
208 | spin_lock_init(&bd->lock); | |
5309cb38 | 209 | bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cf | 210 | INIT_HLIST_NODE(&bd->dev_list); |
3d6392cf | 211 | return bd; |
3d6392cf JA |
212 | } |
213 | ||
214 | static int bsg_put_device(struct bsg_device *bd) | |
215 | { | |
97f46ae4 | 216 | struct request_queue *q = bd->queue; |
3d6392cf JA |
217 | |
218 | mutex_lock(&bsg_mutex); | |
219 | ||
db193954 | 220 | if (!refcount_dec_and_test(&bd->ref_count)) { |
3f27e3ed | 221 | mutex_unlock(&bsg_mutex); |
28519c89 | 222 | return 0; |
3f27e3ed FT |
223 | } |
224 | ||
225 | hlist_del(&bd->dev_list); | |
226 | mutex_unlock(&bsg_mutex); | |
3d6392cf | 227 | |
3124b65d | 228 | bsg_dbg(bd, "tearing down\n"); |
3d6392cf JA |
229 | |
230 | /* | |
231 | * close can always block | |
232 | */ | |
5309cb38 | 233 | kfree(bd); |
28519c89 CH |
234 | blk_put_queue(q); |
235 | return 0; | |
3d6392cf JA |
236 | } |
237 | ||
238 | static struct bsg_device *bsg_add_device(struct inode *inode, | |
d351af01 | 239 | struct request_queue *rq, |
3d6392cf JA |
240 | struct file *file) |
241 | { | |
25fd1643 | 242 | struct bsg_device *bd; |
3d6392cf | 243 | unsigned char buf[32]; |
d9f97264 | 244 | |
d6c73964 AG |
245 | lockdep_assert_held(&bsg_mutex); |
246 | ||
09ac46c4 | 247 | if (!blk_get_queue(rq)) |
c3ff1b90 | 248 | return ERR_PTR(-ENXIO); |
3d6392cf JA |
249 | |
250 | bd = bsg_alloc_device(); | |
c3ff1b90 FT |
251 | if (!bd) { |
252 | blk_put_queue(rq); | |
3d6392cf | 253 | return ERR_PTR(-ENOMEM); |
c3ff1b90 | 254 | } |
3d6392cf | 255 | |
d351af01 | 256 | bd->queue = rq; |
0b07de85 | 257 | |
db193954 | 258 | refcount_set(&bd->ref_count, 1); |
842ea771 | 259 | hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cf | 260 | |
3ada8b7e | 261 | strncpy(bd->name, dev_name(rq->bsg_dev.class_dev), sizeof(bd->name) - 1); |
3124b65d | 262 | bsg_dbg(bd, "bound to <%s>, max queue %d\n", |
9e69fbb5 | 263 | format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cf | 264 | |
3d6392cf JA |
265 | return bd; |
266 | } | |
267 | ||
842ea771 | 268 | static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cf | 269 | { |
43ac9e62 | 270 | struct bsg_device *bd; |
3d6392cf | 271 | |
d6c73964 | 272 | lockdep_assert_held(&bsg_mutex); |
3d6392cf | 273 | |
b67bfe0d | 274 | hlist_for_each_entry(bd, bsg_dev_idx_hash(minor), dev_list) { |
842ea771 | 275 | if (bd->queue == q) { |
db193954 | 276 | refcount_inc(&bd->ref_count); |
43ac9e62 | 277 | goto found; |
3d6392cf | 278 | } |
3d6392cf | 279 | } |
43ac9e62 FT |
280 | bd = NULL; |
281 | found: | |
3d6392cf JA |
282 | return bd; |
283 | } | |
284 | ||
285 | static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) | |
286 | { | |
598443a2 FT |
287 | struct bsg_device *bd; |
288 | struct bsg_class_device *bcd; | |
3d6392cf | 289 | |
3d6392cf JA |
290 | /* |
291 | * find the class device | |
292 | */ | |
3d6392cf | 293 | mutex_lock(&bsg_mutex); |
598443a2 | 294 | bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
3d6392cf | 295 | |
d6c73964 AG |
296 | if (!bcd) { |
297 | bd = ERR_PTR(-ENODEV); | |
298 | goto out_unlock; | |
299 | } | |
3d6392cf | 300 | |
842ea771 | 301 | bd = __bsg_get_device(iminor(inode), bcd->queue); |
d6c73964 AG |
302 | if (!bd) |
303 | bd = bsg_add_device(inode, bcd->queue, file); | |
d45ac4fa | 304 | |
d6c73964 AG |
305 | out_unlock: |
306 | mutex_unlock(&bsg_mutex); | |
d45ac4fa | 307 | return bd; |
3d6392cf JA |
308 | } |
309 | ||
310 | static int bsg_open(struct inode *inode, struct file *file) | |
311 | { | |
75bd2ef1 JC |
312 | struct bsg_device *bd; |
313 | ||
75bd2ef1 | 314 | bd = bsg_get_device(inode, file); |
3d6392cf JA |
315 | |
316 | if (IS_ERR(bd)) | |
317 | return PTR_ERR(bd); | |
318 | ||
319 | file->private_data = bd; | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static int bsg_release(struct inode *inode, struct file *file) | |
324 | { | |
325 | struct bsg_device *bd = file->private_data; | |
326 | ||
327 | file->private_data = NULL; | |
328 | return bsg_put_device(bd); | |
329 | } | |
330 | ||
ccf3209f CH |
331 | static int bsg_get_command_q(struct bsg_device *bd, int __user *uarg) |
332 | { | |
333 | return put_user(bd->max_queue, uarg); | |
334 | } | |
335 | ||
336 | static int bsg_set_command_q(struct bsg_device *bd, int __user *uarg) | |
337 | { | |
338 | int queue; | |
339 | ||
340 | if (get_user(queue, uarg)) | |
341 | return -EFAULT; | |
342 | if (queue < 1) | |
343 | return -EINVAL; | |
344 | ||
345 | spin_lock_irq(&bd->lock); | |
346 | bd->max_queue = queue; | |
347 | spin_unlock_irq(&bd->lock); | |
348 | return 0; | |
349 | } | |
350 | ||
25fd1643 | 351 | static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cf JA |
352 | { |
353 | struct bsg_device *bd = file->private_data; | |
ccf3209f | 354 | void __user *uarg = (void __user *) arg; |
3d6392cf | 355 | |
3d6392cf | 356 | switch (cmd) { |
ccf3209f CH |
357 | /* |
358 | * Our own ioctls | |
359 | */ | |
3d6392cf | 360 | case SG_GET_COMMAND_Q: |
ccf3209f CH |
361 | return bsg_get_command_q(bd, uarg); |
362 | case SG_SET_COMMAND_Q: | |
363 | return bsg_set_command_q(bd, uarg); | |
3d6392cf JA |
364 | |
365 | /* | |
366 | * SCSI/sg ioctls | |
367 | */ | |
368 | case SG_GET_VERSION_NUM: | |
369 | case SCSI_IOCTL_GET_IDLUN: | |
370 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
371 | case SG_SET_TIMEOUT: | |
372 | case SG_GET_TIMEOUT: | |
373 | case SG_GET_RESERVED_SIZE: | |
374 | case SG_SET_RESERVED_SIZE: | |
375 | case SG_EMULATED_HOST: | |
ccf3209f | 376 | case SCSI_IOCTL_SEND_COMMAND: |
74f3c8af | 377 | return scsi_cmd_ioctl(bd->queue, NULL, file->f_mode, cmd, uarg); |
ccf3209f CH |
378 | case SG_IO: |
379 | return bsg_sg_io(bd->queue, file->f_mode, uarg); | |
3d6392cf | 380 | default: |
3d6392cf | 381 | return -ENOTTY; |
3d6392cf JA |
382 | } |
383 | } | |
384 | ||
7344be05 | 385 | static const struct file_operations bsg_fops = { |
3d6392cf JA |
386 | .open = bsg_open, |
387 | .release = bsg_release, | |
25fd1643 | 388 | .unlocked_ioctl = bsg_ioctl, |
fe0da4e5 | 389 | .compat_ioctl = compat_ptr_ioctl, |
3d6392cf | 390 | .owner = THIS_MODULE, |
6038f373 | 391 | .llseek = default_llseek, |
3d6392cf JA |
392 | }; |
393 | ||
d351af01 | 394 | void bsg_unregister_queue(struct request_queue *q) |
3d6392cf | 395 | { |
d351af01 | 396 | struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cf | 397 | |
df468820 FT |
398 | if (!bcd->class_dev) |
399 | return; | |
3d6392cf JA |
400 | |
401 | mutex_lock(&bsg_mutex); | |
598443a2 | 402 | idr_remove(&bsg_minor_idr, bcd->minor); |
37b40adf SG |
403 | if (q->kobj.sd) |
404 | sysfs_remove_link(&q->kobj, "bsg"); | |
ee959b00 | 405 | device_unregister(bcd->class_dev); |
3d6392cf | 406 | bcd->class_dev = NULL; |
3d6392cf JA |
407 | mutex_unlock(&bsg_mutex); |
408 | } | |
4cf0723a | 409 | EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cf | 410 | |
97f46ae4 | 411 | int bsg_register_queue(struct request_queue *q, struct device *parent, |
5de815a7 | 412 | const char *name, const struct bsg_ops *ops) |
3d6392cf | 413 | { |
598443a2 | 414 | struct bsg_class_device *bcd; |
3d6392cf | 415 | dev_t dev; |
bab998d6 | 416 | int ret; |
ee959b00 | 417 | struct device *class_dev = NULL; |
3d6392cf JA |
418 | |
419 | /* | |
420 | * we need a proper transport to send commands, not a stacked device | |
421 | */ | |
344e9ffc | 422 | if (!queue_is_mq(q)) |
3d6392cf JA |
423 | return 0; |
424 | ||
d351af01 | 425 | bcd = &q->bsg_dev; |
3d6392cf | 426 | memset(bcd, 0, sizeof(*bcd)); |
3d6392cf JA |
427 | |
428 | mutex_lock(&bsg_mutex); | |
292b7f27 | 429 | |
bab998d6 TH |
430 | ret = idr_alloc(&bsg_minor_idr, bcd, 0, BSG_MAX_DEVS, GFP_KERNEL); |
431 | if (ret < 0) { | |
432 | if (ret == -ENOSPC) { | |
433 | printk(KERN_ERR "bsg: too many bsg devices\n"); | |
434 | ret = -EINVAL; | |
435 | } | |
598443a2 | 436 | goto unlock; |
598443a2 FT |
437 | } |
438 | ||
bab998d6 | 439 | bcd->minor = ret; |
d351af01 | 440 | bcd->queue = q; |
17cb960f | 441 | bcd->ops = ops; |
46f6ef4a | 442 | dev = MKDEV(bsg_major, bcd->minor); |
5de815a7 | 443 | class_dev = device_create(bsg_class, parent, dev, NULL, "%s", name); |
4e2872d6 FT |
444 | if (IS_ERR(class_dev)) { |
445 | ret = PTR_ERR(class_dev); | |
5de815a7 | 446 | goto idr_remove; |
4e2872d6 FT |
447 | } |
448 | bcd->class_dev = class_dev; | |
449 | ||
abce891a | 450 | if (q->kobj.sd) { |
4e2872d6 FT |
451 | ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); |
452 | if (ret) | |
598443a2 | 453 | goto unregister_class_dev; |
4e2872d6 FT |
454 | } |
455 | ||
3d6392cf JA |
456 | mutex_unlock(&bsg_mutex); |
457 | return 0; | |
6826ee4f | 458 | |
598443a2 | 459 | unregister_class_dev: |
ee959b00 | 460 | device_unregister(class_dev); |
5de815a7 | 461 | idr_remove: |
bab998d6 | 462 | idr_remove(&bsg_minor_idr, bcd->minor); |
598443a2 | 463 | unlock: |
264a0472 | 464 | mutex_unlock(&bsg_mutex); |
4e2872d6 FT |
465 | return ret; |
466 | } | |
17cb960f CH |
467 | |
468 | int bsg_scsi_register_queue(struct request_queue *q, struct device *parent) | |
469 | { | |
470 | if (!blk_queue_scsi_passthrough(q)) { | |
471 | WARN_ONCE(true, "Attempt to register a non-SCSI queue\n"); | |
472 | return -EINVAL; | |
473 | } | |
474 | ||
5de815a7 | 475 | return bsg_register_queue(q, parent, dev_name(parent), &bsg_scsi_ops); |
17cb960f CH |
476 | } |
477 | EXPORT_SYMBOL_GPL(bsg_scsi_register_queue); | |
4e2872d6 | 478 | |
7e7654a9 | 479 | static struct cdev bsg_cdev; |
292b7f27 | 480 | |
2c9ede55 | 481 | static char *bsg_devnode(struct device *dev, umode_t *mode) |
2bdf9149 KS |
482 | { |
483 | return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev)); | |
484 | } | |
485 | ||
3d6392cf JA |
486 | static int __init bsg_init(void) |
487 | { | |
488 | int ret, i; | |
46f6ef4a | 489 | dev_t devid; |
3d6392cf | 490 | |
25fd1643 | 491 | for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cf JA |
492 | INIT_HLIST_HEAD(&bsg_device_list[i]); |
493 | ||
494 | bsg_class = class_create(THIS_MODULE, "bsg"); | |
28519c89 CH |
495 | if (IS_ERR(bsg_class)) |
496 | return PTR_ERR(bsg_class); | |
e454cea2 | 497 | bsg_class->devnode = bsg_devnode; |
3d6392cf | 498 | |
46f6ef4a | 499 | ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770c FT |
500 | if (ret) |
501 | goto destroy_bsg_class; | |
292b7f27 | 502 | |
46f6ef4a JA |
503 | bsg_major = MAJOR(devid); |
504 | ||
292b7f27 | 505 | cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4a | 506 | ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770c FT |
507 | if (ret) |
508 | goto unregister_chrdev; | |
3d6392cf | 509 | |
5d3a8cd3 | 510 | printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce | 511 | " loaded (major %d)\n", bsg_major); |
3d6392cf | 512 | return 0; |
9b9f770c FT |
513 | unregister_chrdev: |
514 | unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); | |
515 | destroy_bsg_class: | |
516 | class_destroy(bsg_class); | |
9b9f770c | 517 | return ret; |
3d6392cf JA |
518 | } |
519 | ||
520 | MODULE_AUTHOR("Jens Axboe"); | |
0ed081ce | 521 | MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cf JA |
522 | MODULE_LICENSE("GPL"); |
523 | ||
4e2872d6 | 524 | device_initcall(bsg_init); |