1 /*
2 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public Licens
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
17 *
18 */
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/string.h>
22 #include <linux/module.h>
23 #include <linux/blkdev.h>
24 #include <linux/capability.h>
25 #include <linux/completion.h>
26 #include <linux/cdrom.h>
27 #include <linux/ratelimit.h>
28 #include <linux/slab.h>
29 #include <linux/times.h>
30 #include <linux/uio.h>
31 #include <linux/uaccess.h>
32
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_ioctl.h>
35 #include <scsi/scsi_cmnd.h>
36
37 struct blk_cmd_filter {
38 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
39 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
40 };
41
42 static struct blk_cmd_filter blk_default_cmd_filter;
43
44 /* Command group 3 is reserved and should never be used. */
45 const unsigned char scsi_command_size_tbl[8] =
46 {
47 6, 10, 10, 12,
48 16, 12, 10, 10
49 };
50 EXPORT_SYMBOL(scsi_command_size_tbl);
51
52 #include <scsi/sg.h>
53
sg_get_version(int __user * p)54 static int sg_get_version(int __user *p)
55 {
56 static const int sg_version_num = 30527;
57 return put_user(sg_version_num, p);
58 }
59
scsi_get_idlun(struct request_queue * q,int __user * p)60 static int scsi_get_idlun(struct request_queue *q, int __user *p)
61 {
62 return put_user(0, p);
63 }
64
scsi_get_bus(struct request_queue * q,int __user * p)65 static int scsi_get_bus(struct request_queue *q, int __user *p)
66 {
67 return put_user(0, p);
68 }
69
sg_get_timeout(struct request_queue * q)70 static int sg_get_timeout(struct request_queue *q)
71 {
72 return jiffies_to_clock_t(q->sg_timeout);
73 }
74
sg_set_timeout(struct request_queue * q,int __user * p)75 static int sg_set_timeout(struct request_queue *q, int __user *p)
76 {
77 int timeout, err = get_user(timeout, p);
78
79 if (!err)
80 q->sg_timeout = clock_t_to_jiffies(timeout);
81
82 return err;
83 }
84
max_sectors_bytes(struct request_queue * q)85 static int max_sectors_bytes(struct request_queue *q)
86 {
87 unsigned int max_sectors = queue_max_sectors(q);
88
89 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
90
91 return max_sectors << 9;
92 }
93
sg_get_reserved_size(struct request_queue * q,int __user * p)94 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
95 {
96 int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
97
98 return put_user(val, p);
99 }
100
sg_set_reserved_size(struct request_queue * q,int __user * p)101 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
102 {
103 int size, err = get_user(size, p);
104
105 if (err)
106 return err;
107
108 if (size < 0)
109 return -EINVAL;
110
111 q->sg_reserved_size = min(size, max_sectors_bytes(q));
112 return 0;
113 }
114
115 /*
116 * will always return that we are ATAPI even for a real SCSI drive, I'm not
117 * so sure this is worth doing anything about (why would you care??)
118 */
sg_emulated_host(struct request_queue * q,int __user * p)119 static int sg_emulated_host(struct request_queue *q, int __user *p)
120 {
121 return put_user(1, p);
122 }
123
blk_set_cmd_filter_defaults(struct blk_cmd_filter * filter)124 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
125 {
126 /* Basic read-only commands */
127 __set_bit(TEST_UNIT_READY, filter->read_ok);
128 __set_bit(REQUEST_SENSE, filter->read_ok);
129 __set_bit(READ_6, filter->read_ok);
130 __set_bit(READ_10, filter->read_ok);
131 __set_bit(READ_12, filter->read_ok);
132 __set_bit(READ_16, filter->read_ok);
133 __set_bit(READ_BUFFER, filter->read_ok);
134 __set_bit(READ_DEFECT_DATA, filter->read_ok);
135 __set_bit(READ_CAPACITY, filter->read_ok);
136 __set_bit(READ_LONG, filter->read_ok);
137 __set_bit(INQUIRY, filter->read_ok);
138 __set_bit(MODE_SENSE, filter->read_ok);
139 __set_bit(MODE_SENSE_10, filter->read_ok);
140 __set_bit(LOG_SENSE, filter->read_ok);
141 __set_bit(START_STOP, filter->read_ok);
142 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
143 __set_bit(VERIFY_16, filter->read_ok);
144 __set_bit(REPORT_LUNS, filter->read_ok);
145 __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
146 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
147 __set_bit(MAINTENANCE_IN, filter->read_ok);
148 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
149
150 /* Audio CD commands */
151 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
152 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
153 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
154 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
155 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
156
157 /* CD/DVD data reading */
158 __set_bit(GPCMD_READ_CD, filter->read_ok);
159 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
160 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
161 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
162 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
163 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
164 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
165 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
166 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
167 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
168 __set_bit(GPCMD_SCAN, filter->read_ok);
169 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
170 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
171 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
172 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
173 __set_bit(GPCMD_SEEK, filter->read_ok);
174 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
175
176 /* Basic writing commands */
177 __set_bit(WRITE_6, filter->write_ok);
178 __set_bit(WRITE_10, filter->write_ok);
179 __set_bit(WRITE_VERIFY, filter->write_ok);
180 __set_bit(WRITE_12, filter->write_ok);
181 __set_bit(WRITE_VERIFY_12, filter->write_ok);
182 __set_bit(WRITE_16, filter->write_ok);
183 __set_bit(WRITE_LONG, filter->write_ok);
184 __set_bit(WRITE_LONG_2, filter->write_ok);
185 __set_bit(WRITE_SAME, filter->write_ok);
186 __set_bit(WRITE_SAME_16, filter->write_ok);
187 __set_bit(WRITE_SAME_32, filter->write_ok);
188 __set_bit(ERASE, filter->write_ok);
189 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
190 __set_bit(MODE_SELECT, filter->write_ok);
191 __set_bit(LOG_SELECT, filter->write_ok);
192 __set_bit(GPCMD_BLANK, filter->write_ok);
193 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
194 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
195 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
196 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
197 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
198 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
199 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
200 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
201 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
202 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
203 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
204 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
205 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
206 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
207 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
208 }
209
blk_verify_command(unsigned char * cmd,fmode_t mode)210 int blk_verify_command(unsigned char *cmd, fmode_t mode)
211 {
212 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
213
214 /* root can do any command. */
215 if (capable(CAP_SYS_RAWIO))
216 return 0;
217
218 /* Anybody who can open the device can do a read-safe command */
219 if (test_bit(cmd[0], filter->read_ok))
220 return 0;
221
222 /* Write-safe commands require a writable open */
223 if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
224 return 0;
225
226 return -EPERM;
227 }
228 EXPORT_SYMBOL(blk_verify_command);
229
blk_fill_sghdr_rq(struct request_queue * q,struct request * rq,struct sg_io_hdr * hdr,fmode_t mode)230 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
231 struct sg_io_hdr *hdr, fmode_t mode)
232 {
233 struct scsi_request *req = scsi_req(rq);
234
235 if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
236 return -EFAULT;
237 if (blk_verify_command(req->cmd, mode))
238 return -EPERM;
239
240 /*
241 * fill in request structure
242 */
243 req->cmd_len = hdr->cmd_len;
244
245 rq->timeout = msecs_to_jiffies(hdr->timeout);
246 if (!rq->timeout)
247 rq->timeout = q->sg_timeout;
248 if (!rq->timeout)
249 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
250 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
251 rq->timeout = BLK_MIN_SG_TIMEOUT;
252
253 return 0;
254 }
255
blk_complete_sghdr_rq(struct request * rq,struct sg_io_hdr * hdr,struct bio * bio)256 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
257 struct bio *bio)
258 {
259 struct scsi_request *req = scsi_req(rq);
260 int r, ret = 0;
261
262 /*
263 * fill in all the output members
264 */
265 hdr->status = req->result & 0xff;
266 hdr->masked_status = status_byte(req->result);
267 hdr->msg_status = msg_byte(req->result);
268 hdr->host_status = host_byte(req->result);
269 hdr->driver_status = driver_byte(req->result);
270 hdr->info = 0;
271 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
272 hdr->info |= SG_INFO_CHECK;
273 hdr->resid = req->resid_len;
274 hdr->sb_len_wr = 0;
275
276 if (req->sense_len && hdr->sbp) {
277 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
278
279 if (!copy_to_user(hdr->sbp, req->sense, len))
280 hdr->sb_len_wr = len;
281 else
282 ret = -EFAULT;
283 }
284
285 r = blk_rq_unmap_user(bio);
286 if (!ret)
287 ret = r;
288
289 return ret;
290 }
291
sg_io(struct request_queue * q,struct gendisk * bd_disk,struct sg_io_hdr * hdr,fmode_t mode)292 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
293 struct sg_io_hdr *hdr, fmode_t mode)
294 {
295 unsigned long start_time;
296 ssize_t ret = 0;
297 int writing = 0;
298 int at_head = 0;
299 struct request *rq;
300 struct scsi_request *req;
301 struct bio *bio;
302
303 if (hdr->interface_id != 'S')
304 return -EINVAL;
305
306 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
307 return -EIO;
308
309 if (hdr->dxfer_len)
310 switch (hdr->dxfer_direction) {
311 default:
312 return -EINVAL;
313 case SG_DXFER_TO_DEV:
314 writing = 1;
315 break;
316 case SG_DXFER_TO_FROM_DEV:
317 case SG_DXFER_FROM_DEV:
318 break;
319 }
320 if (hdr->flags & SG_FLAG_Q_AT_HEAD)
321 at_head = 1;
322
323 ret = -ENOMEM;
324 rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
325 if (IS_ERR(rq))
326 return PTR_ERR(rq);
327 req = scsi_req(rq);
328
329 if (hdr->cmd_len > BLK_MAX_CDB) {
330 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
331 if (!req->cmd)
332 goto out_put_request;
333 }
334
335 ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
336 if (ret < 0)
337 goto out_free_cdb;
338
339 ret = 0;
340 if (hdr->iovec_count) {
341 struct iov_iter i;
342 struct iovec *iov = NULL;
343
344 ret = import_iovec(rq_data_dir(rq),
345 hdr->dxferp, hdr->iovec_count,
346 0, &iov, &i);
347 if (ret < 0)
348 goto out_free_cdb;
349
350 /* SG_IO howto says that the shorter of the two wins */
351 iov_iter_truncate(&i, hdr->dxfer_len);
352
353 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
354 kfree(iov);
355 } else if (hdr->dxfer_len)
356 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
357 GFP_KERNEL);
358
359 if (ret)
360 goto out_free_cdb;
361
362 bio = rq->bio;
363 req->retries = 0;
364
365 start_time = jiffies;
366
367 /* ignore return value. All information is passed back to caller
368 * (if he doesn't check that is his problem).
369 * N.B. a non-zero SCSI status is _not_ necessarily an error.
370 */
371 blk_execute_rq(q, bd_disk, rq, at_head);
372
373 hdr->duration = jiffies_to_msecs(jiffies - start_time);
374
375 ret = blk_complete_sghdr_rq(rq, hdr, bio);
376
377 out_free_cdb:
378 scsi_req_free_cmd(req);
379 out_put_request:
380 blk_put_request(rq);
381 return ret;
382 }
383
384 /**
385 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
386 * @q: request queue to send scsi commands down
387 * @disk: gendisk to operate on (option)
388 * @mode: mode used to open the file through which the ioctl has been
389 * submitted
390 * @sic: userspace structure describing the command to perform
391 *
392 * Send down the scsi command described by @sic to the device below
393 * the request queue @q. If @file is non-NULL it's used to perform
394 * fine-grained permission checks that allow users to send down
395 * non-destructive SCSI commands. If the caller has a struct gendisk
396 * available it should be passed in as @disk to allow the low level
397 * driver to use the information contained in it. A non-NULL @disk
398 * is only allowed if the caller knows that the low level driver doesn't
399 * need it (e.g. in the scsi subsystem).
400 *
401 * Notes:
402 * - This interface is deprecated - users should use the SG_IO
403 * interface instead, as this is a more flexible approach to
404 * performing SCSI commands on a device.
405 * - The SCSI command length is determined by examining the 1st byte
406 * of the given command. There is no way to override this.
407 * - Data transfers are limited to PAGE_SIZE
408 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
409 * accommodate the sense buffer when an error occurs.
410 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
411 * old code will not be surprised.
412 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
413 * a negative return and the Unix error code in 'errno'.
414 * If the SCSI command succeeds then 0 is returned.
415 * Positive numbers returned are the compacted SCSI error codes (4
416 * bytes in one int) where the lowest byte is the SCSI status.
417 */
sg_scsi_ioctl(struct request_queue * q,struct gendisk * disk,fmode_t mode,struct scsi_ioctl_command __user * sic)418 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
419 struct scsi_ioctl_command __user *sic)
420 {
421 enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */
422 struct request *rq;
423 struct scsi_request *req;
424 int err;
425 unsigned int in_len, out_len, bytes, opcode, cmdlen;
426 char *buffer = NULL;
427
428 if (!sic)
429 return -EINVAL;
430
431 /*
432 * get in an out lengths, verify they don't exceed a page worth of data
433 */
434 if (get_user(in_len, &sic->inlen))
435 return -EFAULT;
436 if (get_user(out_len, &sic->outlen))
437 return -EFAULT;
438 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
439 return -EINVAL;
440 if (get_user(opcode, sic->data))
441 return -EFAULT;
442
443 bytes = max(in_len, out_len);
444 if (bytes) {
445 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
446 if (!buffer)
447 return -ENOMEM;
448
449 }
450
451 rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
452 if (IS_ERR(rq)) {
453 err = PTR_ERR(rq);
454 goto error_free_buffer;
455 }
456 req = scsi_req(rq);
457
458 cmdlen = COMMAND_SIZE(opcode);
459
460 /*
461 * get command and data to send to device, if any
462 */
463 err = -EFAULT;
464 req->cmd_len = cmdlen;
465 if (copy_from_user(req->cmd, sic->data, cmdlen))
466 goto error;
467
468 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
469 goto error;
470
471 err = blk_verify_command(req->cmd, mode);
472 if (err)
473 goto error;
474
475 /* default. possible overriden later */
476 req->retries = 5;
477
478 switch (opcode) {
479 case SEND_DIAGNOSTIC:
480 case FORMAT_UNIT:
481 rq->timeout = FORMAT_UNIT_TIMEOUT;
482 req->retries = 1;
483 break;
484 case START_STOP:
485 rq->timeout = START_STOP_TIMEOUT;
486 break;
487 case MOVE_MEDIUM:
488 rq->timeout = MOVE_MEDIUM_TIMEOUT;
489 break;
490 case READ_ELEMENT_STATUS:
491 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
492 break;
493 case READ_DEFECT_DATA:
494 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
495 req->retries = 1;
496 break;
497 default:
498 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
499 break;
500 }
501
502 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
503 err = DRIVER_ERROR << 24;
504 goto error;
505 }
506
507 blk_execute_rq(q, disk, rq, 0);
508
509 err = req->result & 0xff; /* only 8 bit SCSI status */
510 if (err) {
511 if (req->sense_len && req->sense) {
512 bytes = (OMAX_SB_LEN > req->sense_len) ?
513 req->sense_len : OMAX_SB_LEN;
514 if (copy_to_user(sic->data, req->sense, bytes))
515 err = -EFAULT;
516 }
517 } else {
518 if (copy_to_user(sic->data, buffer, out_len))
519 err = -EFAULT;
520 }
521
522 error:
523 blk_put_request(rq);
524
525 error_free_buffer:
526 kfree(buffer);
527
528 return err;
529 }
530 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
531
532 /* Send basic block requests */
__blk_send_generic(struct request_queue * q,struct gendisk * bd_disk,int cmd,int data)533 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
534 int cmd, int data)
535 {
536 struct request *rq;
537 int err;
538
539 rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
540 if (IS_ERR(rq))
541 return PTR_ERR(rq);
542 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
543 scsi_req(rq)->cmd[0] = cmd;
544 scsi_req(rq)->cmd[4] = data;
545 scsi_req(rq)->cmd_len = 6;
546 blk_execute_rq(q, bd_disk, rq, 0);
547 err = scsi_req(rq)->result ? -EIO : 0;
548 blk_put_request(rq);
549
550 return err;
551 }
552
blk_send_start_stop(struct request_queue * q,struct gendisk * bd_disk,int data)553 static inline int blk_send_start_stop(struct request_queue *q,
554 struct gendisk *bd_disk, int data)
555 {
556 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
557 }
558
scsi_cmd_ioctl(struct request_queue * q,struct gendisk * bd_disk,fmode_t mode,unsigned int cmd,void __user * arg)559 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
560 unsigned int cmd, void __user *arg)
561 {
562 int err;
563
564 if (!q)
565 return -ENXIO;
566
567 switch (cmd) {
568 /*
569 * new sgv3 interface
570 */
571 case SG_GET_VERSION_NUM:
572 err = sg_get_version(arg);
573 break;
574 case SCSI_IOCTL_GET_IDLUN:
575 err = scsi_get_idlun(q, arg);
576 break;
577 case SCSI_IOCTL_GET_BUS_NUMBER:
578 err = scsi_get_bus(q, arg);
579 break;
580 case SG_SET_TIMEOUT:
581 err = sg_set_timeout(q, arg);
582 break;
583 case SG_GET_TIMEOUT:
584 err = sg_get_timeout(q);
585 break;
586 case SG_GET_RESERVED_SIZE:
587 err = sg_get_reserved_size(q, arg);
588 break;
589 case SG_SET_RESERVED_SIZE:
590 err = sg_set_reserved_size(q, arg);
591 break;
592 case SG_EMULATED_HOST:
593 err = sg_emulated_host(q, arg);
594 break;
595 case SG_IO: {
596 struct sg_io_hdr hdr;
597
598 err = -EFAULT;
599 if (copy_from_user(&hdr, arg, sizeof(hdr)))
600 break;
601 err = sg_io(q, bd_disk, &hdr, mode);
602 if (err == -EFAULT)
603 break;
604
605 if (copy_to_user(arg, &hdr, sizeof(hdr)))
606 err = -EFAULT;
607 break;
608 }
609 case CDROM_SEND_PACKET: {
610 struct cdrom_generic_command cgc;
611 struct sg_io_hdr hdr;
612
613 err = -EFAULT;
614 if (copy_from_user(&cgc, arg, sizeof(cgc)))
615 break;
616 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
617 memset(&hdr, 0, sizeof(hdr));
618 hdr.interface_id = 'S';
619 hdr.cmd_len = sizeof(cgc.cmd);
620 hdr.dxfer_len = cgc.buflen;
621 err = 0;
622 switch (cgc.data_direction) {
623 case CGC_DATA_UNKNOWN:
624 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
625 break;
626 case CGC_DATA_WRITE:
627 hdr.dxfer_direction = SG_DXFER_TO_DEV;
628 break;
629 case CGC_DATA_READ:
630 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
631 break;
632 case CGC_DATA_NONE:
633 hdr.dxfer_direction = SG_DXFER_NONE;
634 break;
635 default:
636 err = -EINVAL;
637 }
638 if (err)
639 break;
640
641 hdr.dxferp = cgc.buffer;
642 hdr.sbp = cgc.sense;
643 if (hdr.sbp)
644 hdr.mx_sb_len = sizeof(struct request_sense);
645 hdr.timeout = jiffies_to_msecs(cgc.timeout);
646 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
647 hdr.cmd_len = sizeof(cgc.cmd);
648
649 err = sg_io(q, bd_disk, &hdr, mode);
650 if (err == -EFAULT)
651 break;
652
653 if (hdr.status)
654 err = -EIO;
655
656 cgc.stat = err;
657 cgc.buflen = hdr.resid;
658 if (copy_to_user(arg, &cgc, sizeof(cgc)))
659 err = -EFAULT;
660
661 break;
662 }
663
664 /*
665 * old junk scsi send command ioctl
666 */
667 case SCSI_IOCTL_SEND_COMMAND:
668 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
669 err = -EINVAL;
670 if (!arg)
671 break;
672
673 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
674 break;
675 case CDROMCLOSETRAY:
676 err = blk_send_start_stop(q, bd_disk, 0x03);
677 break;
678 case CDROMEJECT:
679 err = blk_send_start_stop(q, bd_disk, 0x02);
680 break;
681 default:
682 err = -ENOTTY;
683 }
684
685 return err;
686 }
687 EXPORT_SYMBOL(scsi_cmd_ioctl);
688
scsi_verify_blk_ioctl(struct block_device * bd,unsigned int cmd)689 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
690 {
691 if (bd && bd == bd->bd_contains)
692 return 0;
693
694 if (capable(CAP_SYS_RAWIO))
695 return 0;
696
697 return -ENOIOCTLCMD;
698 }
699 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
700
scsi_cmd_blk_ioctl(struct block_device * bd,fmode_t mode,unsigned int cmd,void __user * arg)701 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
702 unsigned int cmd, void __user *arg)
703 {
704 int ret;
705
706 ret = scsi_verify_blk_ioctl(bd, cmd);
707 if (ret < 0)
708 return ret;
709
710 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
711 }
712 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
713
714 /**
715 * scsi_req_init - initialize certain fields of a scsi_request structure
716 * @req: Pointer to a scsi_request structure.
717 * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
718 * of struct scsi_request.
719 */
scsi_req_init(struct scsi_request * req)720 void scsi_req_init(struct scsi_request *req)
721 {
722 memset(req->__cmd, 0, sizeof(req->__cmd));
723 req->cmd = req->__cmd;
724 req->cmd_len = BLK_MAX_CDB;
725 req->sense_len = 0;
726 }
727 EXPORT_SYMBOL(scsi_req_init);
728
blk_scsi_ioctl_init(void)729 static int __init blk_scsi_ioctl_init(void)
730 {
731 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
732 return 0;
733 }
734 fs_initcall(blk_scsi_ioctl_init);
735