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 <asm/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 has_write_perm)210 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
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) && has_write_perm)
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 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
234 return -EFAULT;
235 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
236 return -EPERM;
237
238 /*
239 * fill in request structure
240 */
241 rq->cmd_len = hdr->cmd_len;
242
243 rq->timeout = msecs_to_jiffies(hdr->timeout);
244 if (!rq->timeout)
245 rq->timeout = q->sg_timeout;
246 if (!rq->timeout)
247 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
248 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
249 rq->timeout = BLK_MIN_SG_TIMEOUT;
250
251 return 0;
252 }
253
blk_complete_sghdr_rq(struct request * rq,struct sg_io_hdr * hdr,struct bio * bio)254 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
255 struct bio *bio)
256 {
257 int r, ret = 0;
258
259 /*
260 * fill in all the output members
261 */
262 hdr->status = rq->errors & 0xff;
263 hdr->masked_status = status_byte(rq->errors);
264 hdr->msg_status = msg_byte(rq->errors);
265 hdr->host_status = host_byte(rq->errors);
266 hdr->driver_status = driver_byte(rq->errors);
267 hdr->info = 0;
268 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
269 hdr->info |= SG_INFO_CHECK;
270 hdr->resid = rq->resid_len;
271 hdr->sb_len_wr = 0;
272
273 if (rq->sense_len && hdr->sbp) {
274 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
275
276 if (!copy_to_user(hdr->sbp, rq->sense, len))
277 hdr->sb_len_wr = len;
278 else
279 ret = -EFAULT;
280 }
281
282 r = blk_rq_unmap_user(bio);
283 if (!ret)
284 ret = r;
285
286 return ret;
287 }
288
sg_io(struct request_queue * q,struct gendisk * bd_disk,struct sg_io_hdr * hdr,fmode_t mode)289 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
290 struct sg_io_hdr *hdr, fmode_t mode)
291 {
292 unsigned long start_time;
293 ssize_t ret = 0;
294 int writing = 0;
295 int at_head = 0;
296 struct request *rq;
297 char sense[SCSI_SENSE_BUFFERSIZE];
298 struct bio *bio;
299
300 if (hdr->interface_id != 'S')
301 return -EINVAL;
302
303 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
304 return -EIO;
305
306 if (hdr->dxfer_len)
307 switch (hdr->dxfer_direction) {
308 default:
309 return -EINVAL;
310 case SG_DXFER_TO_DEV:
311 writing = 1;
312 break;
313 case SG_DXFER_TO_FROM_DEV:
314 case SG_DXFER_FROM_DEV:
315 break;
316 }
317 if (hdr->flags & SG_FLAG_Q_AT_HEAD)
318 at_head = 1;
319
320 ret = -ENOMEM;
321 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
322 if (IS_ERR(rq))
323 return PTR_ERR(rq);
324 blk_rq_set_block_pc(rq);
325
326 if (hdr->cmd_len > BLK_MAX_CDB) {
327 rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
328 if (!rq->cmd)
329 goto out_put_request;
330 }
331
332 ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
333 if (ret < 0)
334 goto out_free_cdb;
335
336 ret = 0;
337 if (hdr->iovec_count) {
338 struct iov_iter i;
339 struct iovec *iov = NULL;
340
341 ret = import_iovec(rq_data_dir(rq),
342 hdr->dxferp, hdr->iovec_count,
343 0, &iov, &i);
344 if (ret < 0)
345 goto out_free_cdb;
346
347 /* SG_IO howto says that the shorter of the two wins */
348 iov_iter_truncate(&i, hdr->dxfer_len);
349
350 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
351 kfree(iov);
352 } else if (hdr->dxfer_len)
353 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
354 GFP_KERNEL);
355
356 if (ret)
357 goto out_free_cdb;
358
359 bio = rq->bio;
360 memset(sense, 0, sizeof(sense));
361 rq->sense = sense;
362 rq->sense_len = 0;
363 rq->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 if (rq->cmd != rq->__cmd)
379 kfree(rq->cmd);
380 out_put_request:
381 blk_put_request(rq);
382 return ret;
383 }
384
385 /**
386 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
387 * @file: file this ioctl operates on (optional)
388 * @q: request queue to send scsi commands down
389 * @disk: gendisk to operate on (option)
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 */
418 #define OMAX_SB_LEN 16 /* For backward compatibility */
sg_scsi_ioctl(struct request_queue * q,struct gendisk * disk,fmode_t mode,struct scsi_ioctl_command __user * sic)419 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
420 struct scsi_ioctl_command __user *sic)
421 {
422 struct request *rq;
423 int err;
424 unsigned int in_len, out_len, bytes, opcode, cmdlen;
425 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
426
427 if (!sic)
428 return -EINVAL;
429
430 /*
431 * get in an out lengths, verify they don't exceed a page worth of data
432 */
433 if (get_user(in_len, &sic->inlen))
434 return -EFAULT;
435 if (get_user(out_len, &sic->outlen))
436 return -EFAULT;
437 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
438 return -EINVAL;
439 if (get_user(opcode, sic->data))
440 return -EFAULT;
441
442 bytes = max(in_len, out_len);
443 if (bytes) {
444 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
445 if (!buffer)
446 return -ENOMEM;
447
448 }
449
450 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_RECLAIM);
451 if (IS_ERR(rq)) {
452 err = PTR_ERR(rq);
453 goto error_free_buffer;
454 }
455 blk_rq_set_block_pc(rq);
456
457 cmdlen = COMMAND_SIZE(opcode);
458
459 /*
460 * get command and data to send to device, if any
461 */
462 err = -EFAULT;
463 rq->cmd_len = cmdlen;
464 if (copy_from_user(rq->cmd, sic->data, cmdlen))
465 goto error;
466
467 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
468 goto error;
469
470 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
471 if (err)
472 goto error;
473
474 /* default. possible overriden later */
475 rq->retries = 5;
476
477 switch (opcode) {
478 case SEND_DIAGNOSTIC:
479 case FORMAT_UNIT:
480 rq->timeout = FORMAT_UNIT_TIMEOUT;
481 rq->retries = 1;
482 break;
483 case START_STOP:
484 rq->timeout = START_STOP_TIMEOUT;
485 break;
486 case MOVE_MEDIUM:
487 rq->timeout = MOVE_MEDIUM_TIMEOUT;
488 break;
489 case READ_ELEMENT_STATUS:
490 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
491 break;
492 case READ_DEFECT_DATA:
493 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
494 rq->retries = 1;
495 break;
496 default:
497 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
498 break;
499 }
500
501 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
502 err = DRIVER_ERROR << 24;
503 goto error;
504 }
505
506 memset(sense, 0, sizeof(sense));
507 rq->sense = sense;
508 rq->sense_len = 0;
509
510 blk_execute_rq(q, disk, rq, 0);
511
512 err = rq->errors & 0xff; /* only 8 bit SCSI status */
513 if (err) {
514 if (rq->sense_len && rq->sense) {
515 bytes = (OMAX_SB_LEN > rq->sense_len) ?
516 rq->sense_len : OMAX_SB_LEN;
517 if (copy_to_user(sic->data, rq->sense, bytes))
518 err = -EFAULT;
519 }
520 } else {
521 if (copy_to_user(sic->data, buffer, out_len))
522 err = -EFAULT;
523 }
524
525 error:
526 blk_put_request(rq);
527
528 error_free_buffer:
529 kfree(buffer);
530
531 return err;
532 }
533 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
534
535 /* Send basic block requests */
__blk_send_generic(struct request_queue * q,struct gendisk * bd_disk,int cmd,int data)536 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
537 int cmd, int data)
538 {
539 struct request *rq;
540 int err;
541
542 rq = blk_get_request(q, WRITE, __GFP_RECLAIM);
543 if (IS_ERR(rq))
544 return PTR_ERR(rq);
545 blk_rq_set_block_pc(rq);
546 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
547 rq->cmd[0] = cmd;
548 rq->cmd[4] = data;
549 rq->cmd_len = 6;
550 err = blk_execute_rq(q, bd_disk, rq, 0);
551 blk_put_request(rq);
552
553 return err;
554 }
555
blk_send_start_stop(struct request_queue * q,struct gendisk * bd_disk,int data)556 static inline int blk_send_start_stop(struct request_queue *q,
557 struct gendisk *bd_disk, int data)
558 {
559 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
560 }
561
scsi_cmd_ioctl(struct request_queue * q,struct gendisk * bd_disk,fmode_t mode,unsigned int cmd,void __user * arg)562 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
563 unsigned int cmd, void __user *arg)
564 {
565 int err;
566
567 if (!q)
568 return -ENXIO;
569
570 switch (cmd) {
571 /*
572 * new sgv3 interface
573 */
574 case SG_GET_VERSION_NUM:
575 err = sg_get_version(arg);
576 break;
577 case SCSI_IOCTL_GET_IDLUN:
578 err = scsi_get_idlun(q, arg);
579 break;
580 case SCSI_IOCTL_GET_BUS_NUMBER:
581 err = scsi_get_bus(q, arg);
582 break;
583 case SG_SET_TIMEOUT:
584 err = sg_set_timeout(q, arg);
585 break;
586 case SG_GET_TIMEOUT:
587 err = sg_get_timeout(q);
588 break;
589 case SG_GET_RESERVED_SIZE:
590 err = sg_get_reserved_size(q, arg);
591 break;
592 case SG_SET_RESERVED_SIZE:
593 err = sg_set_reserved_size(q, arg);
594 break;
595 case SG_EMULATED_HOST:
596 err = sg_emulated_host(q, arg);
597 break;
598 case SG_IO: {
599 struct sg_io_hdr hdr;
600
601 err = -EFAULT;
602 if (copy_from_user(&hdr, arg, sizeof(hdr)))
603 break;
604 err = sg_io(q, bd_disk, &hdr, mode);
605 if (err == -EFAULT)
606 break;
607
608 if (copy_to_user(arg, &hdr, sizeof(hdr)))
609 err = -EFAULT;
610 break;
611 }
612 case CDROM_SEND_PACKET: {
613 struct cdrom_generic_command cgc;
614 struct sg_io_hdr hdr;
615
616 err = -EFAULT;
617 if (copy_from_user(&cgc, arg, sizeof(cgc)))
618 break;
619 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
620 memset(&hdr, 0, sizeof(hdr));
621 hdr.interface_id = 'S';
622 hdr.cmd_len = sizeof(cgc.cmd);
623 hdr.dxfer_len = cgc.buflen;
624 err = 0;
625 switch (cgc.data_direction) {
626 case CGC_DATA_UNKNOWN:
627 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
628 break;
629 case CGC_DATA_WRITE:
630 hdr.dxfer_direction = SG_DXFER_TO_DEV;
631 break;
632 case CGC_DATA_READ:
633 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
634 break;
635 case CGC_DATA_NONE:
636 hdr.dxfer_direction = SG_DXFER_NONE;
637 break;
638 default:
639 err = -EINVAL;
640 }
641 if (err)
642 break;
643
644 hdr.dxferp = cgc.buffer;
645 hdr.sbp = cgc.sense;
646 if (hdr.sbp)
647 hdr.mx_sb_len = sizeof(struct request_sense);
648 hdr.timeout = jiffies_to_msecs(cgc.timeout);
649 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
650 hdr.cmd_len = sizeof(cgc.cmd);
651
652 err = sg_io(q, bd_disk, &hdr, mode);
653 if (err == -EFAULT)
654 break;
655
656 if (hdr.status)
657 err = -EIO;
658
659 cgc.stat = err;
660 cgc.buflen = hdr.resid;
661 if (copy_to_user(arg, &cgc, sizeof(cgc)))
662 err = -EFAULT;
663
664 break;
665 }
666
667 /*
668 * old junk scsi send command ioctl
669 */
670 case SCSI_IOCTL_SEND_COMMAND:
671 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
672 err = -EINVAL;
673 if (!arg)
674 break;
675
676 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
677 break;
678 case CDROMCLOSETRAY:
679 err = blk_send_start_stop(q, bd_disk, 0x03);
680 break;
681 case CDROMEJECT:
682 err = blk_send_start_stop(q, bd_disk, 0x02);
683 break;
684 default:
685 err = -ENOTTY;
686 }
687
688 return err;
689 }
690 EXPORT_SYMBOL(scsi_cmd_ioctl);
691
scsi_verify_blk_ioctl(struct block_device * bd,unsigned int cmd)692 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
693 {
694 if (bd && bd == bd->bd_contains)
695 return 0;
696
697 /* Actually none of these is particularly useful on a partition,
698 * but they are safe.
699 */
700 switch (cmd) {
701 case SCSI_IOCTL_GET_IDLUN:
702 case SCSI_IOCTL_GET_BUS_NUMBER:
703 case SCSI_IOCTL_GET_PCI:
704 case SCSI_IOCTL_PROBE_HOST:
705 case SG_GET_VERSION_NUM:
706 case SG_SET_TIMEOUT:
707 case SG_GET_TIMEOUT:
708 case SG_GET_RESERVED_SIZE:
709 case SG_SET_RESERVED_SIZE:
710 case SG_EMULATED_HOST:
711 return 0;
712 case CDROM_GET_CAPABILITY:
713 /* Keep this until we remove the printk below. udev sends it
714 * and we do not want to spam dmesg about it. CD-ROMs do
715 * not have partitions, so we get here only for disks.
716 */
717 return -ENOIOCTLCMD;
718 default:
719 break;
720 }
721
722 if (capable(CAP_SYS_RAWIO))
723 return 0;
724
725 /* In particular, rule out all resets and host-specific ioctls. */
726 printk_ratelimited(KERN_WARNING
727 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
728
729 return -ENOIOCTLCMD;
730 }
731 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
732
scsi_cmd_blk_ioctl(struct block_device * bd,fmode_t mode,unsigned int cmd,void __user * arg)733 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
734 unsigned int cmd, void __user *arg)
735 {
736 int ret;
737
738 ret = scsi_verify_blk_ioctl(bd, cmd);
739 if (ret < 0)
740 return ret;
741
742 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
743 }
744 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
745
blk_scsi_ioctl_init(void)746 static int __init blk_scsi_ioctl_init(void)
747 {
748 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
749 return 0;
750 }
751 fs_initcall(blk_scsi_ioctl_init);
752