Blame view
block/bsg.c
23.6 KB
3d6392cfb bsg: support for ... |
1 |
/* |
0c6a89ba6 [SCSI] bsg: updat... |
2 |
* bsg.c - block layer implementation of the sg v4 interface |
3d6392cfb bsg: support for ... |
3 4 5 6 7 8 9 10 11 |
* * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com> * * This file is subject to the terms and conditions of the GNU General Public * License version 2. See the file "COPYING" in the main directory of this * archive for more details. * */ |
3d6392cfb bsg: support for ... |
12 13 14 15 16 17 |
#include <linux/module.h> #include <linux/init.h> #include <linux/file.h> #include <linux/blkdev.h> #include <linux/poll.h> #include <linux/cdev.h> |
ad5ebd2fa block: jiffies fixes |
18 |
#include <linux/jiffies.h> |
3d6392cfb bsg: support for ... |
19 20 |
#include <linux/percpu.h> #include <linux/uio.h> |
598443a21 [SCSI] bsg: use l... |
21 |
#include <linux/idr.h> |
3d6392cfb bsg: support for ... |
22 |
#include <linux/bsg.h> |
5a0e3ad6a include cleanup: ... |
23 |
#include <linux/slab.h> |
3d6392cfb bsg: support for ... |
24 25 26 27 |
#include <scsi/scsi.h> #include <scsi/scsi_ioctl.h> #include <scsi/scsi_cmnd.h> |
4e2872d6b bind bsg to all S... |
28 29 |
#include <scsi/scsi_device.h> #include <scsi/scsi_driver.h> |
3d6392cfb bsg: support for ... |
30 |
#include <scsi/sg.h> |
0ed081ce2 bsg: minor cleanup |
31 32 |
#define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" #define BSG_VERSION "0.4" |
3d6392cfb bsg: support for ... |
33 |
|
3d6392cfb bsg: support for ... |
34 |
struct bsg_device { |
165125e1e [BLOCK] Get rid o... |
35 |
struct request_queue *queue; |
3d6392cfb bsg: support for ... |
36 37 38 39 40 |
spinlock_t lock; struct list_head busy_list; struct list_head done_list; struct hlist_node dev_list; atomic_t ref_count; |
3d6392cfb bsg: support for ... |
41 42 |
int queued_cmds; int done_cmds; |
3d6392cfb bsg: support for ... |
43 44 |
wait_queue_head_t wq_done; wait_queue_head_t wq_free; |
3ada8b7e9 block: struct dev... |
45 |
char name[20]; |
3d6392cfb bsg: support for ... |
46 47 48 49 50 51 |
int max_queue; unsigned long flags; }; enum { BSG_F_BLOCK = 1, |
3d6392cfb bsg: support for ... |
52 |
}; |
5309cb38d Add queue resizin... |
53 |
#define BSG_DEFAULT_CMDS 64 |
292b7f271 improve bsg devic... |
54 |
#define BSG_MAX_DEVS 32768 |
3d6392cfb bsg: support for ... |
55 56 57 58 |
#undef BSG_DEBUG #ifdef BSG_DEBUG |
24c03d47d block: remove rem... |
59 |
#define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args) |
3d6392cfb bsg: support for ... |
60 61 62 |
#else #define dprintk(fmt, args...) #endif |
3d6392cfb bsg: support for ... |
63 |
static DEFINE_MUTEX(bsg_mutex); |
598443a21 [SCSI] bsg: use l... |
64 |
static DEFINE_IDR(bsg_minor_idr); |
3d6392cfb bsg: support for ... |
65 |
|
25fd16430 bsg: address vari... |
66 |
#define BSG_LIST_ARRAY_SIZE 8 |
25fd16430 bsg: address vari... |
67 |
static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; |
3d6392cfb bsg: support for ... |
68 69 |
static struct class *bsg_class; |
46f6ef4af bsg: convert to d... |
70 |
static int bsg_major; |
3d6392cfb bsg: support for ... |
71 |
|
5309cb38d Add queue resizin... |
72 |
static struct kmem_cache *bsg_cmd_cachep; |
3d6392cfb bsg: support for ... |
73 74 75 76 77 78 79 80 |
/* * our internal command type */ struct bsg_command { struct bsg_device *bd; struct list_head list; struct request *rq; struct bio *bio; |
2c9ecdf40 bsg: add bidi sup... |
81 |
struct bio *bidi_bio; |
3d6392cfb bsg: support for ... |
82 |
int err; |
70e36ecea bsg: replace SG v... |
83 |
struct sg_io_v4 hdr; |
3d6392cfb bsg: support for ... |
84 85 86 87 88 89 |
char sense[SCSI_SENSE_BUFFERSIZE]; }; static void bsg_free_command(struct bsg_command *bc) { struct bsg_device *bd = bc->bd; |
3d6392cfb bsg: support for ... |
90 |
unsigned long flags; |
5309cb38d Add queue resizin... |
91 |
kmem_cache_free(bsg_cmd_cachep, bc); |
3d6392cfb bsg: support for ... |
92 93 94 |
spin_lock_irqsave(&bd->lock, flags); bd->queued_cmds--; |
3d6392cfb bsg: support for ... |
95 96 97 98 |
spin_unlock_irqrestore(&bd->lock, flags); wake_up(&bd->wq_free); } |
e7d721732 bsg: fix a blocki... |
99 |
static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) |
3d6392cfb bsg: support for ... |
100 |
{ |
e7d721732 bsg: fix a blocki... |
101 |
struct bsg_command *bc = ERR_PTR(-EINVAL); |
3d6392cfb bsg: support for ... |
102 103 104 105 106 |
spin_lock_irq(&bd->lock); if (bd->queued_cmds >= bd->max_queue) goto out; |
3d6392cfb bsg: support for ... |
107 |
bd->queued_cmds++; |
3d6392cfb bsg: support for ... |
108 |
spin_unlock_irq(&bd->lock); |
25fd16430 bsg: address vari... |
109 |
bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); |
5309cb38d Add queue resizin... |
110 111 |
if (unlikely(!bc)) { spin_lock_irq(&bd->lock); |
7e75d7308 bsg: simplify __b... |
112 |
bd->queued_cmds--; |
e7d721732 bsg: fix a blocki... |
113 |
bc = ERR_PTR(-ENOMEM); |
7e75d7308 bsg: simplify __b... |
114 |
goto out; |
5309cb38d Add queue resizin... |
115 |
} |
3d6392cfb bsg: support for ... |
116 117 |
bc->bd = bd; INIT_LIST_HEAD(&bc->list); |
5309cb38d Add queue resizin... |
118 119 |
dprintk("%s: returning free cmd %p ", bd->name, bc); |
3d6392cfb bsg: support for ... |
120 121 |
return bc; out: |
3d6392cfb bsg: support for ... |
122 123 124 |
spin_unlock_irq(&bd->lock); return bc; } |
1c1133e1f bsg: device hash ... |
125 |
static inline struct hlist_head *bsg_dev_idx_hash(int index) |
3d6392cfb bsg: support for ... |
126 |
{ |
1c1133e1f bsg: device hash ... |
127 |
return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; |
3d6392cfb bsg: support for ... |
128 |
} |
25fd16430 bsg: address vari... |
129 |
static int bsg_io_schedule(struct bsg_device *bd) |
3d6392cfb bsg: support for ... |
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 |
{ DEFINE_WAIT(wait); int ret = 0; spin_lock_irq(&bd->lock); BUG_ON(bd->done_cmds > bd->queued_cmds); /* * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no * work to do", even though we return -ENOSPC after this same test * during bsg_write() -- there, it means our buffer can't have more * bsg_commands added to it, thus has no space left. */ if (bd->done_cmds == bd->queued_cmds) { ret = -ENODATA; goto unlock; } if (!test_bit(BSG_F_BLOCK, &bd->flags)) { ret = -EAGAIN; goto unlock; } |
25fd16430 bsg: address vari... |
153 |
prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); |
3d6392cfb bsg: support for ... |
154 155 156 |
spin_unlock_irq(&bd->lock); io_schedule(); finish_wait(&bd->wq_done, &wait); |
3d6392cfb bsg: support for ... |
157 158 159 160 161 |
return ret; unlock: spin_unlock_irq(&bd->lock); return ret; } |
165125e1e [BLOCK] Get rid o... |
162 |
static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, |
abf543937 block: move cmdfi... |
163 |
struct sg_io_v4 *hdr, struct bsg_device *bd, |
aeb5d7270 [PATCH] introduce... |
164 |
fmode_t has_write_perm) |
70e36ecea bsg: replace SG v... |
165 |
{ |
9f5de6b10 [SCSI] bsg: add l... |
166 167 168 169 170 |
if (hdr->request_len > BLK_MAX_CDB) { rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); if (!rq->cmd) return -ENOMEM; } |
70e36ecea bsg: replace SG v... |
171 |
|
2b727c630 bsg: fix address ... |
172 |
if (copy_from_user(rq->cmd, (void __user *)(unsigned long)hdr->request, |
70e36ecea bsg: replace SG v... |
173 174 |
hdr->request_len)) return -EFAULT; |
15d10b611 bsg: add SCSI tra... |
175 176 |
if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { |
018e04468 block: get rid of... |
177 |
if (blk_verify_command(rq->cmd, has_write_perm)) |
15d10b611 bsg: add SCSI tra... |
178 179 |
return -EPERM; } else if (!capable(CAP_SYS_RAWIO)) |
70e36ecea bsg: replace SG v... |
180 181 182 183 184 185 |
return -EPERM; /* * fill in request structure */ rq->cmd_len = hdr->request_len; |
70e36ecea bsg: replace SG v... |
186 |
|
ad5ebd2fa block: jiffies fixes |
187 |
rq->timeout = msecs_to_jiffies(hdr->timeout); |
70e36ecea bsg: replace SG v... |
188 189 190 191 |
if (!rq->timeout) rq->timeout = q->sg_timeout; if (!rq->timeout) rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
f2f1fa78a Enforce a minimum... |
192 193 |
if (rq->timeout < BLK_MIN_SG_TIMEOUT) rq->timeout = BLK_MIN_SG_TIMEOUT; |
70e36ecea bsg: replace SG v... |
194 195 196 |
return 0; } |
3d6392cfb bsg: support for ... |
197 |
/* |
70e36ecea bsg: replace SG v... |
198 |
* Check if sg_io_v4 from user is allowed and valid |
3d6392cfb bsg: support for ... |
199 200 |
*/ static int |
165125e1e [BLOCK] Get rid o... |
201 |
bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) |
3d6392cfb bsg: support for ... |
202 |
{ |
15d10b611 bsg: add SCSI tra... |
203 |
int ret = 0; |
70e36ecea bsg: replace SG v... |
204 |
if (hdr->guard != 'Q') |
3d6392cfb bsg: support for ... |
205 |
return -EINVAL; |
3d6392cfb bsg: support for ... |
206 |
|
15d10b611 bsg: add SCSI tra... |
207 208 209 210 211 212 213 214 215 216 217 218 219 |
switch (hdr->protocol) { case BSG_PROTOCOL_SCSI: switch (hdr->subprotocol) { case BSG_SUB_PROTOCOL_SCSI_CMD: case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: break; default: ret = -EINVAL; } break; default: ret = -EINVAL; } |
70e36ecea bsg: replace SG v... |
220 |
|
70e36ecea bsg: replace SG v... |
221 |
*rw = hdr->dout_xfer_len ? WRITE : READ; |
15d10b611 bsg: add SCSI tra... |
222 |
return ret; |
3d6392cfb bsg: support for ... |
223 224 225 |
} /* |
70e36ecea bsg: replace SG v... |
226 |
* map sg_io_v4 to a request. |
3d6392cfb bsg: support for ... |
227 228 |
*/ static struct request * |
c1c201200 bsg: Fix sense bu... |
229 230 |
bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm, u8 *sense) |
3d6392cfb bsg: support for ... |
231 |
{ |
165125e1e [BLOCK] Get rid o... |
232 |
struct request_queue *q = bd->queue; |
2c9ecdf40 bsg: add bidi sup... |
233 |
struct request *rq, *next_rq = NULL; |
25fd16430 bsg: address vari... |
234 |
int ret, rw; |
70e36ecea bsg: replace SG v... |
235 |
unsigned int dxfer_len; |
2b727c630 bsg: fix address ... |
236 |
void __user *dxferp = NULL; |
c7a841f3a [SCSI] bsg: corre... |
237 238 239 240 241 242 243 244 |
struct bsg_class_device *bcd = &q->bsg_dev; /* if the LLD has been removed then the bsg_unregister_queue will * eventually be called and the class_dev was freed, so we can no * longer use this request_queue. Return no such address. */ if (!bcd->class_dev) return ERR_PTR(-ENXIO); |
3d6392cfb bsg: support for ... |
245 |
|
70e36ecea bsg: replace SG v... |
246 247 248 249 |
dprintk("map hdr %llx/%u %llx/%u ", (unsigned long long) hdr->dout_xferp, hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, hdr->din_xfer_len); |
3d6392cfb bsg: support for ... |
250 |
|
70e36ecea bsg: replace SG v... |
251 |
ret = bsg_validate_sgv4_hdr(q, hdr, &rw); |
3d6392cfb bsg: support for ... |
252 253 254 255 |
if (ret) return ERR_PTR(ret); /* |
3ad2f3fbb tree-wide: Assort... |
256 |
* map scatter-gather elements separately and string them to request |
3d6392cfb bsg: support for ... |
257 258 |
*/ rq = blk_get_request(q, rw, GFP_KERNEL); |
a492f0754 block,scsi: fixup... |
259 260 |
if (IS_ERR(rq)) return rq; |
f27b087b8 block: add blk_rq... |
261 |
blk_rq_set_block_pc(rq); |
abf543937 block: move cmdfi... |
262 |
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); |
2c9ecdf40 bsg: add bidi sup... |
263 264 265 266 267 268 269 270 271 272 |
if (ret) goto out; if (rw == WRITE && hdr->din_xfer_len) { if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { ret = -EOPNOTSUPP; goto out; } next_rq = blk_get_request(q, READ, GFP_KERNEL); |
a492f0754 block,scsi: fixup... |
273 274 |
if (IS_ERR(next_rq)) { ret = PTR_ERR(next_rq); |
55872c5a3 bsg: fix potentia... |
275 |
next_rq = NULL; |
2c9ecdf40 bsg: add bidi sup... |
276 277 278 |
goto out; } rq->next_rq = next_rq; |
40f620286 [SCSI] bsg: copy ... |
279 |
next_rq->cmd_type = rq->cmd_type; |
2c9ecdf40 bsg: add bidi sup... |
280 |
|
2b727c630 bsg: fix address ... |
281 |
dxferp = (void __user *)(unsigned long)hdr->din_xferp; |
152e283fd block: introduce ... |
282 283 |
ret = blk_rq_map_user(q, next_rq, NULL, dxferp, hdr->din_xfer_len, GFP_KERNEL); |
2c9ecdf40 bsg: add bidi sup... |
284 285 |
if (ret) goto out; |
3d6392cfb bsg: support for ... |
286 |
} |
70e36ecea bsg: replace SG v... |
287 288 |
if (hdr->dout_xfer_len) { dxfer_len = hdr->dout_xfer_len; |
2b727c630 bsg: fix address ... |
289 |
dxferp = (void __user *)(unsigned long)hdr->dout_xferp; |
70e36ecea bsg: replace SG v... |
290 291 |
} else if (hdr->din_xfer_len) { dxfer_len = hdr->din_xfer_len; |
2b727c630 bsg: fix address ... |
292 |
dxferp = (void __user *)(unsigned long)hdr->din_xferp; |
70e36ecea bsg: replace SG v... |
293 294 295 296 |
} else dxfer_len = 0; if (dxfer_len) { |
152e283fd block: introduce ... |
297 298 |
ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len, GFP_KERNEL); |
2c9ecdf40 bsg: add bidi sup... |
299 300 |
if (ret) goto out; |
3d6392cfb bsg: support for ... |
301 |
} |
c1c201200 bsg: Fix sense bu... |
302 303 304 |
rq->sense = sense; rq->sense_len = 0; |
3d6392cfb bsg: support for ... |
305 |
return rq; |
2c9ecdf40 bsg: add bidi sup... |
306 |
out: |
9f5de6b10 [SCSI] bsg: add l... |
307 308 |
if (rq->cmd != rq->__cmd) kfree(rq->cmd); |
2c9ecdf40 bsg: add bidi sup... |
309 310 311 312 313 314 |
blk_put_request(rq); if (next_rq) { blk_rq_unmap_user(next_rq->bio); blk_put_request(next_rq); } return ERR_PTR(ret); |
3d6392cfb bsg: support for ... |
315 316 317 318 319 320 321 322 323 324 325 |
} /* * async completion call-back from the block layer, when scsi/ide/whatever * calls end_that_request_last() on a request */ static void bsg_rq_end_io(struct request *rq, int uptodate) { struct bsg_command *bc = rq->end_io_data; struct bsg_device *bd = bc->bd; unsigned long flags; |
5309cb38d Add queue resizin... |
326 327 328 |
dprintk("%s: finished rq %p bc %p, bio %p stat %d ", bd->name, rq, bc, bc->bio, uptodate); |
3d6392cfb bsg: support for ... |
329 330 331 332 |
bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); spin_lock_irqsave(&bd->lock, flags); |
25fd16430 bsg: address vari... |
333 334 |
list_move_tail(&bc->list, &bd->done_list); bd->done_cmds++; |
3d6392cfb bsg: support for ... |
335 |
spin_unlock_irqrestore(&bd->lock, flags); |
25fd16430 bsg: address vari... |
336 337 |
wake_up(&bd->wq_done); |
3d6392cfb bsg: support for ... |
338 339 340 341 342 343 |
} /* * do final setup of a 'bc' and submit the matching 'rq' to the block * layer for io */ |
165125e1e [BLOCK] Get rid o... |
344 |
static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, |
3d6392cfb bsg: support for ... |
345 346 |
struct bsg_command *bc, struct request *rq) { |
05378940c bsg: add support ... |
347 |
int at_head = (0 == (bc->hdr.flags & BSG_FLAG_Q_AT_TAIL)); |
3d6392cfb bsg: support for ... |
348 349 350 351 352 |
/* * add bc command to busy queue and submit rq for io */ bc->rq = rq; bc->bio = rq->bio; |
2c9ecdf40 bsg: add bidi sup... |
353 354 |
if (rq->next_rq) bc->bidi_bio = rq->next_rq->bio; |
3d6392cfb bsg: support for ... |
355 356 357 358 359 360 361 362 363 |
bc->hdr.duration = jiffies; spin_lock_irq(&bd->lock); list_add_tail(&bc->list, &bd->busy_list); spin_unlock_irq(&bd->lock); dprintk("%s: queueing rq %p, bc %p ", bd->name, rq, bc); rq->end_io_data = bc; |
05378940c bsg: add support ... |
364 |
blk_execute_rq_nowait(q, NULL, rq, at_head, bsg_rq_end_io); |
3d6392cfb bsg: support for ... |
365 |
} |
25fd16430 bsg: address vari... |
366 |
static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) |
3d6392cfb bsg: support for ... |
367 368 369 370 371 |
{ struct bsg_command *bc = NULL; spin_lock_irq(&bd->lock); if (bd->done_cmds) { |
43ac9e62c [SCSI] bsg: use b... |
372 |
bc = list_first_entry(&bd->done_list, struct bsg_command, list); |
25fd16430 bsg: address vari... |
373 374 |
list_del(&bc->list); bd->done_cmds--; |
3d6392cfb bsg: support for ... |
375 376 377 378 379 380 381 382 383 |
} spin_unlock_irq(&bd->lock); return bc; } /* * Get a finished command from the done list */ |
e7d721732 bsg: fix a blocki... |
384 |
static struct bsg_command *bsg_get_done_cmd(struct bsg_device *bd) |
3d6392cfb bsg: support for ... |
385 386 387 388 389 390 391 392 |
{ struct bsg_command *bc; int ret; do { bc = bsg_next_done_cmd(bd); if (bc) break; |
e7d721732 bsg: fix a blocki... |
393 394 395 396 397 398 |
if (!test_bit(BSG_F_BLOCK, &bd->flags)) { bc = ERR_PTR(-EAGAIN); break; } ret = wait_event_interruptible(bd->wq_done, bd->done_cmds); |
3d6392cfb bsg: support for ... |
399 |
if (ret) { |
e7d721732 bsg: fix a blocki... |
400 |
bc = ERR_PTR(-ERESTARTSYS); |
3d6392cfb bsg: support for ... |
401 402 403 404 405 406 407 408 409 |
break; } } while (1); dprintk("%s: returning done %p ", bd->name, bc); return bc; } |
70e36ecea bsg: replace SG v... |
410 |
static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr, |
2c9ecdf40 bsg: add bidi sup... |
411 |
struct bio *bio, struct bio *bidi_bio) |
70e36ecea bsg: replace SG v... |
412 413 |
{ int ret = 0; |
c1c201200 bsg: Fix sense bu... |
414 415 |
dprintk("rq %p bio %p 0x%x ", rq, bio, rq->errors); |
70e36ecea bsg: replace SG v... |
416 417 418 |
/* * fill in all the output members */ |
478971600 [SCSI] bsg: fix i... |
419 |
hdr->device_status = rq->errors & 0xff; |
70e36ecea bsg: replace SG v... |
420 421 422 423 424 |
hdr->transport_status = host_byte(rq->errors); hdr->driver_status = driver_byte(rq->errors); hdr->info = 0; if (hdr->device_status || hdr->transport_status || hdr->driver_status) hdr->info |= SG_INFO_CHECK; |
70e36ecea bsg: replace SG v... |
425 426 427 |
hdr->response_len = 0; if (rq->sense_len && hdr->response) { |
25fd16430 bsg: address vari... |
428 429 |
int len = min_t(unsigned int, hdr->max_response_len, rq->sense_len); |
70e36ecea bsg: replace SG v... |
430 |
|
2b727c630 bsg: fix address ... |
431 |
ret = copy_to_user((void __user *)(unsigned long)hdr->response, |
70e36ecea bsg: replace SG v... |
432 433 434 435 436 437 |
rq->sense, len); if (!ret) hdr->response_len = len; else ret = -EFAULT; } |
2c9ecdf40 bsg: add bidi sup... |
438 |
if (rq->next_rq) { |
c3a4d78c5 block: add rq->re... |
439 440 |
hdr->dout_resid = rq->resid_len; hdr->din_resid = rq->next_rq->resid_len; |
2c9ecdf40 bsg: add bidi sup... |
441 442 |
blk_rq_unmap_user(bidi_bio); blk_put_request(rq->next_rq); |
0c6a89ba6 [SCSI] bsg: updat... |
443 |
} else if (rq_data_dir(rq) == READ) |
c3a4d78c5 block: add rq->re... |
444 |
hdr->din_resid = rq->resid_len; |
0c6a89ba6 [SCSI] bsg: updat... |
445 |
else |
c3a4d78c5 block: add rq->re... |
446 |
hdr->dout_resid = rq->resid_len; |
2c9ecdf40 bsg: add bidi sup... |
447 |
|
2d507a01d [SCSI] libsas, bs... |
448 449 450 451 452 453 454 455 |
/* * If the request generated a negative error number, return it * (providing we aren't already returning an error); if it's * just a protocol response (i.e. non negative), that gets * processed above. */ if (!ret && rq->errors < 0) ret = rq->errors; |
70e36ecea bsg: replace SG v... |
456 |
blk_rq_unmap_user(bio); |
9f5de6b10 [SCSI] bsg: add l... |
457 458 |
if (rq->cmd != rq->__cmd) kfree(rq->cmd); |
70e36ecea bsg: replace SG v... |
459 460 461 462 |
blk_put_request(rq); return ret; } |
3d6392cfb bsg: support for ... |
463 464 465 466 467 468 469 |
static int bsg_complete_all_commands(struct bsg_device *bd) { struct bsg_command *bc; int ret, tret; dprintk("%s: entered ", bd->name); |
3d6392cfb bsg: support for ... |
470 471 472 473 474 |
/* * wait for all commands to complete */ ret = 0; do { |
25fd16430 bsg: address vari... |
475 |
ret = bsg_io_schedule(bd); |
3d6392cfb bsg: support for ... |
476 477 478 479 480 481 482 483 484 485 486 487 488 489 |
/* * look for -ENODATA specifically -- we'll sometimes get * -ERESTARTSYS when we've taken a signal, but we can't * return until we're done freeing the queue, so ignore * it. The signal will get handled when we're done freeing * the bsg_device. */ } while (ret != -ENODATA); /* * discard done commands */ ret = 0; do { |
e7d721732 bsg: fix a blocki... |
490 491 492 |
spin_lock_irq(&bd->lock); if (!bd->queued_cmds) { spin_unlock_irq(&bd->lock); |
3d6392cfb bsg: support for ... |
493 494 |
break; } |
efba1a31f bsg: fix the dead... |
495 |
spin_unlock_irq(&bd->lock); |
3d6392cfb bsg: support for ... |
496 |
|
e7d721732 bsg: fix a blocki... |
497 498 499 |
bc = bsg_get_done_cmd(bd); if (IS_ERR(bc)) break; |
2c9ecdf40 bsg: add bidi sup... |
500 501 |
tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, bc->bidi_bio); |
3d6392cfb bsg: support for ... |
502 503 504 505 506 507 508 509 |
if (!ret) ret = tret; bsg_free_command(bc); } while (1); return ret; } |
25fd16430 bsg: address vari... |
510 |
static int |
e7d721732 bsg: fix a blocki... |
511 512 |
__bsg_read(char __user *buf, size_t count, struct bsg_device *bd, const struct iovec *iov, ssize_t *bytes_read) |
3d6392cfb bsg: support for ... |
513 514 515 |
{ struct bsg_command *bc; int nr_commands, ret; |
70e36ecea bsg: replace SG v... |
516 |
if (count % sizeof(struct sg_io_v4)) |
3d6392cfb bsg: support for ... |
517 518 519 |
return -EINVAL; ret = 0; |
70e36ecea bsg: replace SG v... |
520 |
nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cfb bsg: support for ... |
521 |
while (nr_commands) { |
e7d721732 bsg: fix a blocki... |
522 |
bc = bsg_get_done_cmd(bd); |
3d6392cfb bsg: support for ... |
523 524 525 526 527 528 529 530 531 532 |
if (IS_ERR(bc)) { ret = PTR_ERR(bc); break; } /* * this is the only case where we need to copy data back * after completing the request. so do that here, * bsg_complete_work() cannot do that for us */ |
2c9ecdf40 bsg: add bidi sup... |
533 534 |
ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio, bc->bidi_bio); |
3d6392cfb bsg: support for ... |
535 |
|
25fd16430 bsg: address vari... |
536 |
if (copy_to_user(buf, &bc->hdr, sizeof(bc->hdr))) |
3d6392cfb bsg: support for ... |
537 538 539 540 541 542 |
ret = -EFAULT; bsg_free_command(bc); if (ret) break; |
70e36ecea bsg: replace SG v... |
543 544 |
buf += sizeof(struct sg_io_v4); *bytes_read += sizeof(struct sg_io_v4); |
3d6392cfb bsg: support for ... |
545 546 547 548 549 550 551 552 553 554 555 556 557 |
nr_commands--; } return ret; } static inline void bsg_set_block(struct bsg_device *bd, struct file *file) { if (file->f_flags & O_NONBLOCK) clear_bit(BSG_F_BLOCK, &bd->flags); else set_bit(BSG_F_BLOCK, &bd->flags); } |
25fd16430 bsg: address vari... |
558 559 560 |
/* * Check if the error is a "real" error that we should return. */ |
3d6392cfb bsg: support for ... |
561 562 563 564 565 566 567 568 569 570 571 572 573 574 |
static inline int err_block_err(int ret) { if (ret && ret != -ENOSPC && ret != -ENODATA && ret != -EAGAIN) return 1; return 0; } static ssize_t bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct bsg_device *bd = file->private_data; int ret; ssize_t bytes_read; |
9e69fbb53 bsg: minor cleanups |
575 576 |
dprintk("%s: read %Zd bytes ", bd->name, count); |
3d6392cfb bsg: support for ... |
577 578 |
bsg_set_block(bd, file); |
0b07de85a allow userspace t... |
579 |
|
3d6392cfb bsg: support for ... |
580 |
bytes_read = 0; |
e7d721732 bsg: fix a blocki... |
581 |
ret = __bsg_read(buf, count, bd, NULL, &bytes_read); |
3d6392cfb bsg: support for ... |
582 |
*ppos = bytes_read; |
44194e3e8 bsg: remove unnec... |
583 |
if (!bytes_read || err_block_err(ret)) |
3d6392cfb bsg: support for ... |
584 585 586 587 |
bytes_read = ret; return bytes_read; } |
25fd16430 bsg: address vari... |
588 |
static int __bsg_write(struct bsg_device *bd, const char __user *buf, |
aeb5d7270 [PATCH] introduce... |
589 590 |
size_t count, ssize_t *bytes_written, fmode_t has_write_perm) |
3d6392cfb bsg: support for ... |
591 592 593 594 |
{ struct bsg_command *bc; struct request *rq; int ret, nr_commands; |
70e36ecea bsg: replace SG v... |
595 |
if (count % sizeof(struct sg_io_v4)) |
3d6392cfb bsg: support for ... |
596 |
return -EINVAL; |
70e36ecea bsg: replace SG v... |
597 |
nr_commands = count / sizeof(struct sg_io_v4); |
3d6392cfb bsg: support for ... |
598 599 600 601 |
rq = NULL; bc = NULL; ret = 0; while (nr_commands) { |
165125e1e [BLOCK] Get rid o... |
602 |
struct request_queue *q = bd->queue; |
3d6392cfb bsg: support for ... |
603 |
|
e7d721732 bsg: fix a blocki... |
604 |
bc = bsg_alloc_command(bd); |
3d6392cfb bsg: support for ... |
605 606 607 608 609 |
if (IS_ERR(bc)) { ret = PTR_ERR(bc); bc = NULL; break; } |
3d6392cfb bsg: support for ... |
610 611 612 613 614 615 616 617 |
if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) { ret = -EFAULT; break; } /* * get a request, fill in the blanks, and add to request queue */ |
c1c201200 bsg: Fix sense bu... |
618 |
rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm, bc->sense); |
3d6392cfb bsg: support for ... |
619 620 621 622 623 624 625 626 627 628 |
if (IS_ERR(rq)) { ret = PTR_ERR(rq); rq = NULL; break; } bsg_add_command(bd, q, bc, rq); bc = NULL; rq = NULL; nr_commands--; |
70e36ecea bsg: replace SG v... |
629 |
buf += sizeof(struct sg_io_v4); |
25fd16430 bsg: address vari... |
630 |
*bytes_written += sizeof(struct sg_io_v4); |
3d6392cfb bsg: support for ... |
631 |
} |
3d6392cfb bsg: support for ... |
632 633 634 635 636 637 638 639 640 641 |
if (bc) bsg_free_command(bc); return ret; } static ssize_t bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct bsg_device *bd = file->private_data; |
25fd16430 bsg: address vari... |
642 |
ssize_t bytes_written; |
3d6392cfb bsg: support for ... |
643 |
int ret; |
9e69fbb53 bsg: minor cleanups |
644 645 |
dprintk("%s: write %Zd bytes ", bd->name, count); |
3d6392cfb bsg: support for ... |
646 647 |
bsg_set_block(bd, file); |
3d6392cfb bsg: support for ... |
648 |
|
25fd16430 bsg: address vari... |
649 |
bytes_written = 0; |
abf543937 block: move cmdfi... |
650 651 |
ret = __bsg_write(bd, buf, count, &bytes_written, file->f_mode & FMODE_WRITE); |
25fd16430 bsg: address vari... |
652 |
*ppos = bytes_written; |
3d6392cfb bsg: support for ... |
653 654 655 656 |
/* * return bytes written on non-fatal errors */ |
44194e3e8 bsg: remove unnec... |
657 |
if (!bytes_written || err_block_err(ret)) |
25fd16430 bsg: address vari... |
658 |
bytes_written = ret; |
3d6392cfb bsg: support for ... |
659 |
|
25fd16430 bsg: address vari... |
660 661 662 |
dprintk("%s: returning %Zd ", bd->name, bytes_written); return bytes_written; |
3d6392cfb bsg: support for ... |
663 |
} |
3d6392cfb bsg: support for ... |
664 665 |
static struct bsg_device *bsg_alloc_device(void) { |
3d6392cfb bsg: support for ... |
666 |
struct bsg_device *bd; |
3d6392cfb bsg: support for ... |
667 668 669 670 671 672 |
bd = kzalloc(sizeof(struct bsg_device), GFP_KERNEL); if (unlikely(!bd)) return NULL; spin_lock_init(&bd->lock); |
5309cb38d Add queue resizin... |
673 |
bd->max_queue = BSG_DEFAULT_CMDS; |
3d6392cfb bsg: support for ... |
674 675 676 677 678 679 680 681 |
INIT_LIST_HEAD(&bd->busy_list); INIT_LIST_HEAD(&bd->done_list); INIT_HLIST_NODE(&bd->dev_list); init_waitqueue_head(&bd->wq_free); init_waitqueue_head(&bd->wq_done); return bd; |
3d6392cfb bsg: support for ... |
682 |
} |
97f46ae45 [SCSI] bsg: add r... |
683 684 685 686 |
static void bsg_kref_release_function(struct kref *kref) { struct bsg_class_device *bcd = container_of(kref, struct bsg_class_device, ref); |
8df5fc042 [SCSI] bsg: fix o... |
687 |
struct device *parent = bcd->parent; |
97f46ae45 [SCSI] bsg: add r... |
688 689 690 |
if (bcd->release) bcd->release(bcd->parent); |
8df5fc042 [SCSI] bsg: fix o... |
691 |
put_device(parent); |
97f46ae45 [SCSI] bsg: add r... |
692 |
} |
3d6392cfb bsg: support for ... |
693 694 |
static int bsg_put_device(struct bsg_device *bd) { |
97f46ae45 [SCSI] bsg: add r... |
695 696 |
int ret = 0, do_free; struct request_queue *q = bd->queue; |
3d6392cfb bsg: support for ... |
697 698 |
mutex_lock(&bsg_mutex); |
97f46ae45 [SCSI] bsg: add r... |
699 |
do_free = atomic_dec_and_test(&bd->ref_count); |
3f27e3ed1 [SCSI] bsg: fix b... |
700 701 |
if (!do_free) { mutex_unlock(&bsg_mutex); |
3d6392cfb bsg: support for ... |
702 |
goto out; |
3f27e3ed1 [SCSI] bsg: fix b... |
703 704 705 706 |
} hlist_del(&bd->dev_list); mutex_unlock(&bsg_mutex); |
3d6392cfb bsg: support for ... |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 |
dprintk("%s: tearing down ", bd->name); /* * close can always block */ set_bit(BSG_F_BLOCK, &bd->flags); /* * correct error detection baddies here again. it's the responsibility * of the app to properly reap commands before close() if it wants * fool-proof error detection */ ret = bsg_complete_all_commands(bd); |
5309cb38d Add queue resizin... |
722 |
kfree(bd); |
3d6392cfb bsg: support for ... |
723 |
out: |
97f46ae45 [SCSI] bsg: add r... |
724 725 726 |
kref_put(&q->bsg_dev.ref, bsg_kref_release_function); if (do_free) blk_put_queue(q); |
3d6392cfb bsg: support for ... |
727 728 729 730 |
return ret; } static struct bsg_device *bsg_add_device(struct inode *inode, |
d351af01b bsg: bind bsg to ... |
731 |
struct request_queue *rq, |
3d6392cfb bsg: support for ... |
732 733 |
struct file *file) { |
25fd16430 bsg: address vari... |
734 |
struct bsg_device *bd; |
3d6392cfb bsg: support for ... |
735 736 737 |
#ifdef BSG_DEBUG unsigned char buf[32]; #endif |
09ac46c42 block: misc updat... |
738 |
if (!blk_get_queue(rq)) |
c3ff1b90d [SCSI] bsg: repla... |
739 |
return ERR_PTR(-ENXIO); |
3d6392cfb bsg: support for ... |
740 741 |
bd = bsg_alloc_device(); |
c3ff1b90d [SCSI] bsg: repla... |
742 743 |
if (!bd) { blk_put_queue(rq); |
3d6392cfb bsg: support for ... |
744 |
return ERR_PTR(-ENOMEM); |
c3ff1b90d [SCSI] bsg: repla... |
745 |
} |
3d6392cfb bsg: support for ... |
746 |
|
d351af01b bsg: bind bsg to ... |
747 |
bd->queue = rq; |
0b07de85a allow userspace t... |
748 |
|
3d6392cfb bsg: support for ... |
749 750 751 |
bsg_set_block(bd, file); atomic_set(&bd->ref_count, 1); |
3d6392cfb bsg: support for ... |
752 |
mutex_lock(&bsg_mutex); |
842ea771c [SCSI] bsg: remov... |
753 |
hlist_add_head(&bd->dev_list, bsg_dev_idx_hash(iminor(inode))); |
3d6392cfb bsg: support for ... |
754 |
|
3ada8b7e9 block: struct dev... |
755 |
strncpy(bd->name, dev_name(rq->bsg_dev.class_dev), sizeof(bd->name) - 1); |
3d6392cfb bsg: support for ... |
756 757 |
dprintk("bound to <%s>, max queue %d ", |
9e69fbb53 bsg: minor cleanups |
758 |
format_dev_t(buf, inode->i_rdev), bd->max_queue); |
3d6392cfb bsg: support for ... |
759 760 761 762 |
mutex_unlock(&bsg_mutex); return bd; } |
842ea771c [SCSI] bsg: remov... |
763 |
static struct bsg_device *__bsg_get_device(int minor, struct request_queue *q) |
3d6392cfb bsg: support for ... |
764 |
{ |
43ac9e62c [SCSI] bsg: use b... |
765 |
struct bsg_device *bd; |
3d6392cfb bsg: support for ... |
766 767 |
mutex_lock(&bsg_mutex); |
b67bfe0d4 hlist: drop the n... |
768 |
hlist_for_each_entry(bd, bsg_dev_idx_hash(minor), dev_list) { |
842ea771c [SCSI] bsg: remov... |
769 |
if (bd->queue == q) { |
3d6392cfb bsg: support for ... |
770 |
atomic_inc(&bd->ref_count); |
43ac9e62c [SCSI] bsg: use b... |
771 |
goto found; |
3d6392cfb bsg: support for ... |
772 |
} |
3d6392cfb bsg: support for ... |
773 |
} |
43ac9e62c [SCSI] bsg: use b... |
774 775 |
bd = NULL; found: |
3d6392cfb bsg: support for ... |
776 777 778 779 780 781 |
mutex_unlock(&bsg_mutex); return bd; } static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file) { |
598443a21 [SCSI] bsg: use l... |
782 783 |
struct bsg_device *bd; struct bsg_class_device *bcd; |
3d6392cfb bsg: support for ... |
784 |
|
3d6392cfb bsg: support for ... |
785 786 787 |
/* * find the class device */ |
3d6392cfb bsg: support for ... |
788 |
mutex_lock(&bsg_mutex); |
598443a21 [SCSI] bsg: use l... |
789 |
bcd = idr_find(&bsg_minor_idr, iminor(inode)); |
d45ac4fa8 [SCSI] bsg: takes... |
790 |
if (bcd) |
97f46ae45 [SCSI] bsg: add r... |
791 |
kref_get(&bcd->ref); |
3d6392cfb bsg: support for ... |
792 793 794 795 |
mutex_unlock(&bsg_mutex); if (!bcd) return ERR_PTR(-ENODEV); |
842ea771c [SCSI] bsg: remov... |
796 |
bd = __bsg_get_device(iminor(inode), bcd->queue); |
d45ac4fa8 [SCSI] bsg: takes... |
797 798 799 800 801 |
if (bd) return bd; bd = bsg_add_device(inode, bcd->queue, file); if (IS_ERR(bd)) |
97f46ae45 [SCSI] bsg: add r... |
802 |
kref_put(&bcd->ref, bsg_kref_release_function); |
d45ac4fa8 [SCSI] bsg: takes... |
803 804 |
return bd; |
3d6392cfb bsg: support for ... |
805 806 807 808 |
} static int bsg_open(struct inode *inode, struct file *file) { |
75bd2ef14 bsg: cdev lock_ke... |
809 |
struct bsg_device *bd; |
75bd2ef14 bsg: cdev lock_ke... |
810 |
bd = bsg_get_device(inode, file); |
3d6392cfb bsg: support for ... |
811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 |
if (IS_ERR(bd)) return PTR_ERR(bd); file->private_data = bd; return 0; } static int bsg_release(struct inode *inode, struct file *file) { struct bsg_device *bd = file->private_data; file->private_data = NULL; return bsg_put_device(bd); } static unsigned int bsg_poll(struct file *file, poll_table *wait) { struct bsg_device *bd = file->private_data; unsigned int mask = 0; poll_wait(file, &bd->wq_done, wait); poll_wait(file, &bd->wq_free, wait); spin_lock_irq(&bd->lock); if (!list_empty(&bd->done_list)) mask |= POLLIN | POLLRDNORM; |
80ceb0571 bsg: fix bsg_poll... |
838 |
if (bd->queued_cmds < bd->max_queue) |
3d6392cfb bsg: support for ... |
839 840 841 842 843 |
mask |= POLLOUT; spin_unlock_irq(&bd->lock); return mask; } |
25fd16430 bsg: address vari... |
844 |
static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
3d6392cfb bsg: support for ... |
845 846 847 |
{ struct bsg_device *bd = file->private_data; int __user *uarg = (int __user *) arg; |
2d507a01d [SCSI] libsas, bs... |
848 |
int ret; |
3d6392cfb bsg: support for ... |
849 |
|
3d6392cfb bsg: support for ... |
850 851 852 853 854 855 |
switch (cmd) { /* * our own ioctls */ case SG_GET_COMMAND_Q: return put_user(bd->max_queue, uarg); |
5309cb38d Add queue resizin... |
856 |
case SG_SET_COMMAND_Q: { |
3d6392cfb bsg: support for ... |
857 858 859 860 |
int queue; if (get_user(queue, uarg)) return -EFAULT; |
5309cb38d Add queue resizin... |
861 |
if (queue < 1) |
3d6392cfb bsg: support for ... |
862 |
return -EINVAL; |
5309cb38d Add queue resizin... |
863 |
spin_lock_irq(&bd->lock); |
3d6392cfb bsg: support for ... |
864 |
bd->max_queue = queue; |
5309cb38d Add queue resizin... |
865 |
spin_unlock_irq(&bd->lock); |
3d6392cfb bsg: support for ... |
866 867 868 869 870 871 872 873 874 875 876 877 878 879 |
return 0; } /* * SCSI/sg ioctls */ case SG_GET_VERSION_NUM: case SCSI_IOCTL_GET_IDLUN: case SCSI_IOCTL_GET_BUS_NUMBER: case SG_SET_TIMEOUT: case SG_GET_TIMEOUT: case SG_GET_RESERVED_SIZE: case SG_SET_RESERVED_SIZE: case SG_EMULATED_HOST: |
3d6392cfb bsg: support for ... |
880 881 |
case SCSI_IOCTL_SEND_COMMAND: { void __user *uarg = (void __user *) arg; |
74f3c8aff [PATCH] switch sc... |
882 |
return scsi_cmd_ioctl(bd->queue, NULL, file->f_mode, cmd, uarg); |
3d6392cfb bsg: support for ... |
883 |
} |
10e8855b9 bsg: add SG_IO to... |
884 885 |
case SG_IO: { struct request *rq; |
2c9ecdf40 bsg: add bidi sup... |
886 |
struct bio *bio, *bidi_bio = NULL; |
10e8855b9 bsg: add SG_IO to... |
887 |
struct sg_io_v4 hdr; |
05378940c bsg: add support ... |
888 |
int at_head; |
c1c201200 bsg: Fix sense bu... |
889 |
u8 sense[SCSI_SENSE_BUFFERSIZE]; |
10e8855b9 bsg: add SG_IO to... |
890 891 892 |
if (copy_from_user(&hdr, uarg, sizeof(hdr))) return -EFAULT; |
c1c201200 bsg: Fix sense bu... |
893 |
rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE, sense); |
10e8855b9 bsg: add SG_IO to... |
894 895 896 897 |
if (IS_ERR(rq)) return PTR_ERR(rq); bio = rq->bio; |
2c9ecdf40 bsg: add bidi sup... |
898 899 |
if (rq->next_rq) bidi_bio = rq->next_rq->bio; |
05378940c bsg: add support ... |
900 901 902 |
at_head = (0 == (hdr.flags & BSG_FLAG_Q_AT_TAIL)); blk_execute_rq(bd->queue, NULL, rq, at_head); |
2d507a01d [SCSI] libsas, bs... |
903 |
ret = blk_complete_sgv4_hdr_rq(rq, &hdr, bio, bidi_bio); |
10e8855b9 bsg: add SG_IO to... |
904 905 906 |
if (copy_to_user(uarg, &hdr, sizeof(hdr))) return -EFAULT; |
b711afa69 bsg: style cleanup |
907 |
|
2d507a01d [SCSI] libsas, bs... |
908 |
return ret; |
10e8855b9 bsg: add SG_IO to... |
909 |
} |
3d6392cfb bsg: support for ... |
910 911 912 913 914 915 916 917 918 919 920 |
/* * block device ioctls */ default: #if 0 return ioctl_by_bdev(bd->bdev, cmd, arg); #else return -ENOTTY; #endif } } |
7344be053 bsg: mark struct ... |
921 |
static const struct file_operations bsg_fops = { |
3d6392cfb bsg: support for ... |
922 923 924 925 926 |
.read = bsg_read, .write = bsg_write, .poll = bsg_poll, .open = bsg_open, .release = bsg_release, |
25fd16430 bsg: address vari... |
927 |
.unlocked_ioctl = bsg_ioctl, |
3d6392cfb bsg: support for ... |
928 |
.owner = THIS_MODULE, |
6038f373a llseek: automatic... |
929 |
.llseek = default_llseek, |
3d6392cfb bsg: support for ... |
930 |
}; |
d351af01b bsg: bind bsg to ... |
931 |
void bsg_unregister_queue(struct request_queue *q) |
3d6392cfb bsg: support for ... |
932 |
{ |
d351af01b bsg: bind bsg to ... |
933 |
struct bsg_class_device *bcd = &q->bsg_dev; |
3d6392cfb bsg: support for ... |
934 |
|
df468820b [SCSI] bsg: fix b... |
935 936 |
if (!bcd->class_dev) return; |
3d6392cfb bsg: support for ... |
937 938 |
mutex_lock(&bsg_mutex); |
598443a21 [SCSI] bsg: use l... |
939 |
idr_remove(&bsg_minor_idr, bcd->minor); |
37b40adf2 bsg: fix sysfs li... |
940 941 |
if (q->kobj.sd) sysfs_remove_link(&q->kobj, "bsg"); |
ee959b00c SCSI: convert str... |
942 |
device_unregister(bcd->class_dev); |
3d6392cfb bsg: support for ... |
943 |
bcd->class_dev = NULL; |
97f46ae45 [SCSI] bsg: add r... |
944 |
kref_put(&bcd->ref, bsg_kref_release_function); |
3d6392cfb bsg: support for ... |
945 946 |
mutex_unlock(&bsg_mutex); } |
4cf0723ac bsg: minor bug fixes |
947 |
EXPORT_SYMBOL_GPL(bsg_unregister_queue); |
3d6392cfb bsg: support for ... |
948 |
|
97f46ae45 [SCSI] bsg: add r... |
949 950 |
int bsg_register_queue(struct request_queue *q, struct device *parent, const char *name, void (*release)(struct device *)) |
3d6392cfb bsg: support for ... |
951 |
{ |
598443a21 [SCSI] bsg: use l... |
952 |
struct bsg_class_device *bcd; |
3d6392cfb bsg: support for ... |
953 |
dev_t dev; |
bab998d62 block: convert to... |
954 |
int ret; |
ee959b00c SCSI: convert str... |
955 |
struct device *class_dev = NULL; |
39dca558a [SCSI] bsg: make ... |
956 957 958 959 960 |
const char *devname; if (name) devname = name; else |
3ada8b7e9 block: struct dev... |
961 |
devname = dev_name(parent); |
3d6392cfb bsg: support for ... |
962 963 964 965 |
/* * we need a proper transport to send commands, not a stacked device */ |
49fd524f9 bsg: update check... |
966 |
if (!queue_is_rq_based(q)) |
3d6392cfb bsg: support for ... |
967 |
return 0; |
d351af01b bsg: bind bsg to ... |
968 |
bcd = &q->bsg_dev; |
3d6392cfb bsg: support for ... |
969 |
memset(bcd, 0, sizeof(*bcd)); |
3d6392cfb bsg: support for ... |
970 971 |
mutex_lock(&bsg_mutex); |
292b7f271 improve bsg devic... |
972 |
|
bab998d62 block: convert to... |
973 974 975 976 977 978 979 |
ret = idr_alloc(&bsg_minor_idr, bcd, 0, BSG_MAX_DEVS, GFP_KERNEL); if (ret < 0) { if (ret == -ENOSPC) { printk(KERN_ERR "bsg: too many bsg devices "); ret = -EINVAL; } |
598443a21 [SCSI] bsg: use l... |
980 |
goto unlock; |
598443a21 [SCSI] bsg: use l... |
981 |
} |
bab998d62 block: convert to... |
982 |
bcd->minor = ret; |
d351af01b bsg: bind bsg to ... |
983 |
bcd->queue = q; |
97f46ae45 [SCSI] bsg: add r... |
984 985 986 |
bcd->parent = get_device(parent); bcd->release = release; kref_init(&bcd->ref); |
46f6ef4af bsg: convert to d... |
987 |
dev = MKDEV(bsg_major, bcd->minor); |
1ff9f542e device create: bl... |
988 |
class_dev = device_create(bsg_class, parent, dev, NULL, "%s", devname); |
4e2872d6b bind bsg to all S... |
989 990 |
if (IS_ERR(class_dev)) { ret = PTR_ERR(class_dev); |
598443a21 [SCSI] bsg: use l... |
991 |
goto put_dev; |
4e2872d6b bind bsg to all S... |
992 993 |
} bcd->class_dev = class_dev; |
abce891a1 Fix new generic b... |
994 |
if (q->kobj.sd) { |
4e2872d6b bind bsg to all S... |
995 996 |
ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg"); if (ret) |
598443a21 [SCSI] bsg: use l... |
997 |
goto unregister_class_dev; |
4e2872d6b bind bsg to all S... |
998 |
} |
3d6392cfb bsg: support for ... |
999 1000 |
mutex_unlock(&bsg_mutex); return 0; |
6826ee4fd [SCSI] bsg: fix b... |
1001 |
|
598443a21 [SCSI] bsg: use l... |
1002 |
unregister_class_dev: |
ee959b00c SCSI: convert str... |
1003 |
device_unregister(class_dev); |
598443a21 [SCSI] bsg: use l... |
1004 |
put_dev: |
97f46ae45 [SCSI] bsg: add r... |
1005 |
put_device(parent); |
bab998d62 block: convert to... |
1006 |
idr_remove(&bsg_minor_idr, bcd->minor); |
598443a21 [SCSI] bsg: use l... |
1007 |
unlock: |
264a04721 bsg: add cheasy e... |
1008 |
mutex_unlock(&bsg_mutex); |
4e2872d6b bind bsg to all S... |
1009 1010 |
return ret; } |
4cf0723ac bsg: minor bug fixes |
1011 |
EXPORT_SYMBOL_GPL(bsg_register_queue); |
4e2872d6b bind bsg to all S... |
1012 |
|
7e7654a92 cdev: remove unne... |
1013 |
static struct cdev bsg_cdev; |
292b7f271 improve bsg devic... |
1014 |
|
2c9ede55e switch device_get... |
1015 |
static char *bsg_devnode(struct device *dev, umode_t *mode) |
2bdf91491 Driver Core: bsg:... |
1016 1017 1018 |
{ return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev)); } |
3d6392cfb bsg: support for ... |
1019 1020 1021 |
static int __init bsg_init(void) { int ret, i; |
46f6ef4af bsg: convert to d... |
1022 |
dev_t devid; |
3d6392cfb bsg: support for ... |
1023 |
|
5309cb38d Add queue resizin... |
1024 |
bsg_cmd_cachep = kmem_cache_create("bsg_cmd", |
20c2df83d mm: Remove slab d... |
1025 |
sizeof(struct bsg_command), 0, 0, NULL); |
5309cb38d Add queue resizin... |
1026 1027 1028 1029 1030 |
if (!bsg_cmd_cachep) { printk(KERN_ERR "bsg: failed creating slab cache "); return -ENOMEM; } |
25fd16430 bsg: address vari... |
1031 |
for (i = 0; i < BSG_LIST_ARRAY_SIZE; i++) |
3d6392cfb bsg: support for ... |
1032 1033 1034 |
INIT_HLIST_HEAD(&bsg_device_list[i]); bsg_class = class_create(THIS_MODULE, "bsg"); |
5309cb38d Add queue resizin... |
1035 |
if (IS_ERR(bsg_class)) { |
9b9f770ce bsg: fix initiali... |
1036 1037 |
ret = PTR_ERR(bsg_class); goto destroy_kmemcache; |
5309cb38d Add queue resizin... |
1038 |
} |
e454cea20 Driver-Core: exte... |
1039 |
bsg_class->devnode = bsg_devnode; |
3d6392cfb bsg: support for ... |
1040 |
|
46f6ef4af bsg: convert to d... |
1041 |
ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); |
9b9f770ce bsg: fix initiali... |
1042 1043 |
if (ret) goto destroy_bsg_class; |
292b7f271 improve bsg devic... |
1044 |
|
46f6ef4af bsg: convert to d... |
1045 |
bsg_major = MAJOR(devid); |
292b7f271 improve bsg devic... |
1046 |
cdev_init(&bsg_cdev, &bsg_fops); |
46f6ef4af bsg: convert to d... |
1047 |
ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS); |
9b9f770ce bsg: fix initiali... |
1048 1049 |
if (ret) goto unregister_chrdev; |
3d6392cfb bsg: support for ... |
1050 |
|
5d3a8cd34 bsg: fix missing ... |
1051 |
printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION |
0ed081ce2 bsg: minor cleanup |
1052 1053 |
" loaded (major %d) ", bsg_major); |
3d6392cfb bsg: support for ... |
1054 |
return 0; |
9b9f770ce bsg: fix initiali... |
1055 1056 1057 1058 1059 1060 1061 |
unregister_chrdev: unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS); destroy_bsg_class: class_destroy(bsg_class); destroy_kmemcache: kmem_cache_destroy(bsg_cmd_cachep); return ret; |
3d6392cfb bsg: support for ... |
1062 1063 1064 |
} MODULE_AUTHOR("Jens Axboe"); |
0ed081ce2 bsg: minor cleanup |
1065 |
MODULE_DESCRIPTION(BSG_DESCRIPTION); |
3d6392cfb bsg: support for ... |
1066 |
MODULE_LICENSE("GPL"); |
4e2872d6b bind bsg to all S... |
1067 |
device_initcall(bsg_init); |