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
sg_get_reserved_size(struct request_queue * q,int __user * p)85 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
86 {
87 unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
88
89 return put_user(val, p);
90 }
91
sg_set_reserved_size(struct request_queue * q,int __user * p)92 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
93 {
94 int size, err = get_user(size, p);
95
96 if (err)
97 return err;
98
99 if (size < 0)
100 return -EINVAL;
101 if (size > (queue_max_sectors(q) << 9))
102 size = queue_max_sectors(q) << 9;
103
104 q->sg_reserved_size = size;
105 return 0;
106 }
107
108 /*
109 * will always return that we are ATAPI even for a real SCSI drive, I'm not
110 * so sure this is worth doing anything about (why would you care??)
111 */
sg_emulated_host(struct request_queue * q,int __user * p)112 static int sg_emulated_host(struct request_queue *q, int __user *p)
113 {
114 return put_user(1, p);
115 }
116
blk_set_cmd_filter_defaults(struct blk_cmd_filter * filter)117 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
118 {
119 /* Basic read-only commands */
120 __set_bit(TEST_UNIT_READY, filter->read_ok);
121 __set_bit(REQUEST_SENSE, filter->read_ok);
122 __set_bit(READ_6, filter->read_ok);
123 __set_bit(READ_10, filter->read_ok);
124 __set_bit(READ_12, filter->read_ok);
125 __set_bit(READ_16, filter->read_ok);
126 __set_bit(READ_BUFFER, filter->read_ok);
127 __set_bit(READ_DEFECT_DATA, filter->read_ok);
128 __set_bit(READ_CAPACITY, filter->read_ok);
129 __set_bit(READ_LONG, filter->read_ok);
130 __set_bit(INQUIRY, filter->read_ok);
131 __set_bit(MODE_SENSE, filter->read_ok);
132 __set_bit(MODE_SENSE_10, filter->read_ok);
133 __set_bit(LOG_SENSE, filter->read_ok);
134 __set_bit(START_STOP, filter->read_ok);
135 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
136 __set_bit(VERIFY_16, filter->read_ok);
137 __set_bit(REPORT_LUNS, filter->read_ok);
138 __set_bit(SERVICE_ACTION_IN, filter->read_ok);
139 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
140 __set_bit(MAINTENANCE_IN, filter->read_ok);
141 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
142
143 /* Audio CD commands */
144 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
145 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
146 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
147 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
148 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
149
150 /* CD/DVD data reading */
151 __set_bit(GPCMD_READ_CD, filter->read_ok);
152 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
153 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
154 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
155 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
156 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
157 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
158 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
159 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
160 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
161 __set_bit(GPCMD_SCAN, filter->read_ok);
162 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
163 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
164 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
165 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
166 __set_bit(GPCMD_SEEK, filter->read_ok);
167 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
168
169 /* Basic writing commands */
170 __set_bit(WRITE_6, filter->write_ok);
171 __set_bit(WRITE_10, filter->write_ok);
172 __set_bit(WRITE_VERIFY, filter->write_ok);
173 __set_bit(WRITE_12, filter->write_ok);
174 __set_bit(WRITE_VERIFY_12, filter->write_ok);
175 __set_bit(WRITE_16, filter->write_ok);
176 __set_bit(WRITE_LONG, filter->write_ok);
177 __set_bit(WRITE_LONG_2, filter->write_ok);
178 __set_bit(ERASE, filter->write_ok);
179 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
180 __set_bit(MODE_SELECT, filter->write_ok);
181 __set_bit(LOG_SELECT, filter->write_ok);
182 __set_bit(GPCMD_BLANK, filter->write_ok);
183 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
184 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
185 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
186 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
187 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
188 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
189 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
190 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
191 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
192 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
193 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
194 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
195 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
196 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
197 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
198 }
199
blk_verify_command(unsigned char * cmd,fmode_t has_write_perm)200 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
201 {
202 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
203
204 /* root can do any command. */
205 if (capable(CAP_SYS_RAWIO))
206 return 0;
207
208 /* if there's no filter set, assume we're filtering everything out */
209 if (!filter)
210 return -EPERM;
211
212 /* Anybody who can open the device can do a read-safe command */
213 if (test_bit(cmd[0], filter->read_ok))
214 return 0;
215
216 /* Write-safe commands require a writable open */
217 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
218 return 0;
219
220 return -EPERM;
221 }
222 EXPORT_SYMBOL(blk_verify_command);
223
blk_fill_sghdr_rq(struct request_queue * q,struct request * rq,struct sg_io_hdr * hdr,fmode_t mode)224 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
225 struct sg_io_hdr *hdr, fmode_t mode)
226 {
227 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
228 return -EFAULT;
229 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
230 return -EPERM;
231
232 /*
233 * fill in request structure
234 */
235 rq->cmd_len = hdr->cmd_len;
236 rq->cmd_type = REQ_TYPE_BLOCK_PC;
237
238 rq->timeout = msecs_to_jiffies(hdr->timeout);
239 if (!rq->timeout)
240 rq->timeout = q->sg_timeout;
241 if (!rq->timeout)
242 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
243 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
244 rq->timeout = BLK_MIN_SG_TIMEOUT;
245
246 return 0;
247 }
248
blk_complete_sghdr_rq(struct request * rq,struct sg_io_hdr * hdr,struct bio * bio)249 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
250 struct bio *bio)
251 {
252 int r, ret = 0;
253
254 /*
255 * fill in all the output members
256 */
257 hdr->status = rq->errors & 0xff;
258 hdr->masked_status = status_byte(rq->errors);
259 hdr->msg_status = msg_byte(rq->errors);
260 hdr->host_status = host_byte(rq->errors);
261 hdr->driver_status = driver_byte(rq->errors);
262 hdr->info = 0;
263 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
264 hdr->info |= SG_INFO_CHECK;
265 hdr->resid = rq->resid_len;
266 hdr->sb_len_wr = 0;
267
268 if (rq->sense_len && hdr->sbp) {
269 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
270
271 if (!copy_to_user(hdr->sbp, rq->sense, len))
272 hdr->sb_len_wr = len;
273 else
274 ret = -EFAULT;
275 }
276
277 r = blk_rq_unmap_user(bio);
278 if (!ret)
279 ret = r;
280 blk_put_request(rq);
281
282 return ret;
283 }
284
sg_io(struct request_queue * q,struct gendisk * bd_disk,struct sg_io_hdr * hdr,fmode_t mode)285 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
286 struct sg_io_hdr *hdr, fmode_t mode)
287 {
288 unsigned long start_time;
289 int writing = 0, ret = 0;
290 struct request *rq;
291 char sense[SCSI_SENSE_BUFFERSIZE];
292 struct bio *bio;
293
294 if (hdr->interface_id != 'S')
295 return -EINVAL;
296 if (hdr->cmd_len > BLK_MAX_CDB)
297 return -EINVAL;
298
299 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
300 return -EIO;
301
302 if (hdr->dxfer_len)
303 switch (hdr->dxfer_direction) {
304 default:
305 return -EINVAL;
306 case SG_DXFER_TO_DEV:
307 writing = 1;
308 break;
309 case SG_DXFER_TO_FROM_DEV:
310 case SG_DXFER_FROM_DEV:
311 break;
312 }
313
314 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
315 if (!rq)
316 return -ENOMEM;
317
318 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
319 blk_put_request(rq);
320 return -EFAULT;
321 }
322
323 if (hdr->iovec_count) {
324 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
325 size_t iov_data_len;
326 struct sg_iovec *sg_iov;
327 struct iovec *iov;
328 int i;
329
330 sg_iov = kmalloc(size, GFP_KERNEL);
331 if (!sg_iov) {
332 ret = -ENOMEM;
333 goto out;
334 }
335
336 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
337 kfree(sg_iov);
338 ret = -EFAULT;
339 goto out;
340 }
341
342 /*
343 * Sum up the vecs, making sure they don't overflow
344 */
345 iov = (struct iovec *) sg_iov;
346 iov_data_len = 0;
347 for (i = 0; i < hdr->iovec_count; i++) {
348 if (iov_data_len + iov[i].iov_len < iov_data_len) {
349 kfree(sg_iov);
350 ret = -EINVAL;
351 goto out;
352 }
353 iov_data_len += iov[i].iov_len;
354 }
355
356 /* SG_IO howto says that the shorter of the two wins */
357 if (hdr->dxfer_len < iov_data_len) {
358 hdr->iovec_count = iov_shorten(iov,
359 hdr->iovec_count,
360 hdr->dxfer_len);
361 iov_data_len = hdr->dxfer_len;
362 }
363
364 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
365 iov_data_len, GFP_KERNEL);
366 kfree(sg_iov);
367 } else if (hdr->dxfer_len)
368 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
369 GFP_KERNEL);
370
371 if (ret)
372 goto out;
373
374 bio = rq->bio;
375 memset(sense, 0, sizeof(sense));
376 rq->sense = sense;
377 rq->sense_len = 0;
378 rq->retries = 0;
379
380 start_time = jiffies;
381
382 /* ignore return value. All information is passed back to caller
383 * (if he doesn't check that is his problem).
384 * N.B. a non-zero SCSI status is _not_ necessarily an error.
385 */
386 blk_execute_rq(q, bd_disk, rq, 0);
387
388 hdr->duration = jiffies_to_msecs(jiffies - start_time);
389
390 return blk_complete_sghdr_rq(rq, hdr, bio);
391 out:
392 blk_put_request(rq);
393 return ret;
394 }
395
396 /**
397 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
398 * @file: file this ioctl operates on (optional)
399 * @q: request queue to send scsi commands down
400 * @disk: gendisk to operate on (option)
401 * @sic: userspace structure describing the command to perform
402 *
403 * Send down the scsi command described by @sic to the device below
404 * the request queue @q. If @file is non-NULL it's used to perform
405 * fine-grained permission checks that allow users to send down
406 * non-destructive SCSI commands. If the caller has a struct gendisk
407 * available it should be passed in as @disk to allow the low level
408 * driver to use the information contained in it. A non-NULL @disk
409 * is only allowed if the caller knows that the low level driver doesn't
410 * need it (e.g. in the scsi subsystem).
411 *
412 * Notes:
413 * - This interface is deprecated - users should use the SG_IO
414 * interface instead, as this is a more flexible approach to
415 * performing SCSI commands on a device.
416 * - The SCSI command length is determined by examining the 1st byte
417 * of the given command. There is no way to override this.
418 * - Data transfers are limited to PAGE_SIZE
419 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
420 * accommodate the sense buffer when an error occurs.
421 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
422 * old code will not be surprised.
423 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
424 * a negative return and the Unix error code in 'errno'.
425 * If the SCSI command succeeds then 0 is returned.
426 * Positive numbers returned are the compacted SCSI error codes (4
427 * bytes in one int) where the lowest byte is the SCSI status.
428 */
429 #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)430 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
431 struct scsi_ioctl_command __user *sic)
432 {
433 struct request *rq;
434 int err;
435 unsigned int in_len, out_len, bytes, opcode, cmdlen;
436 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
437
438 if (!sic)
439 return -EINVAL;
440
441 /*
442 * get in an out lengths, verify they don't exceed a page worth of data
443 */
444 if (get_user(in_len, &sic->inlen))
445 return -EFAULT;
446 if (get_user(out_len, &sic->outlen))
447 return -EFAULT;
448 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
449 return -EINVAL;
450 if (get_user(opcode, sic->data))
451 return -EFAULT;
452
453 bytes = max(in_len, out_len);
454 if (bytes) {
455 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
456 if (!buffer)
457 return -ENOMEM;
458
459 }
460
461 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
462
463 cmdlen = COMMAND_SIZE(opcode);
464
465 /*
466 * get command and data to send to device, if any
467 */
468 err = -EFAULT;
469 rq->cmd_len = cmdlen;
470 if (copy_from_user(rq->cmd, sic->data, cmdlen))
471 goto error;
472
473 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
474 goto error;
475
476 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
477 if (err)
478 goto error;
479
480 /* default. possible overriden later */
481 rq->retries = 5;
482
483 switch (opcode) {
484 case SEND_DIAGNOSTIC:
485 case FORMAT_UNIT:
486 rq->timeout = FORMAT_UNIT_TIMEOUT;
487 rq->retries = 1;
488 break;
489 case START_STOP:
490 rq->timeout = START_STOP_TIMEOUT;
491 break;
492 case MOVE_MEDIUM:
493 rq->timeout = MOVE_MEDIUM_TIMEOUT;
494 break;
495 case READ_ELEMENT_STATUS:
496 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
497 break;
498 case READ_DEFECT_DATA:
499 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
500 rq->retries = 1;
501 break;
502 default:
503 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
504 break;
505 }
506
507 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
508 err = DRIVER_ERROR << 24;
509 goto out;
510 }
511
512 memset(sense, 0, sizeof(sense));
513 rq->sense = sense;
514 rq->sense_len = 0;
515 rq->cmd_type = REQ_TYPE_BLOCK_PC;
516
517 blk_execute_rq(q, disk, rq, 0);
518
519 out:
520 err = rq->errors & 0xff; /* only 8 bit SCSI status */
521 if (err) {
522 if (rq->sense_len && rq->sense) {
523 bytes = (OMAX_SB_LEN > rq->sense_len) ?
524 rq->sense_len : OMAX_SB_LEN;
525 if (copy_to_user(sic->data, rq->sense, bytes))
526 err = -EFAULT;
527 }
528 } else {
529 if (copy_to_user(sic->data, buffer, out_len))
530 err = -EFAULT;
531 }
532
533 error:
534 kfree(buffer);
535 blk_put_request(rq);
536 return err;
537 }
538 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
539
540 /* Send basic block requests */
__blk_send_generic(struct request_queue * q,struct gendisk * bd_disk,int cmd,int data)541 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
542 int cmd, int data)
543 {
544 struct request *rq;
545 int err;
546
547 rq = blk_get_request(q, WRITE, __GFP_WAIT);
548 rq->cmd_type = REQ_TYPE_BLOCK_PC;
549 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
550 rq->cmd[0] = cmd;
551 rq->cmd[4] = data;
552 rq->cmd_len = 6;
553 err = blk_execute_rq(q, bd_disk, rq, 0);
554 blk_put_request(rq);
555
556 return err;
557 }
558
blk_send_start_stop(struct request_queue * q,struct gendisk * bd_disk,int data)559 static inline int blk_send_start_stop(struct request_queue *q,
560 struct gendisk *bd_disk, int data)
561 {
562 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
563 }
564
scsi_cmd_ioctl(struct request_queue * q,struct gendisk * bd_disk,fmode_t mode,unsigned int cmd,void __user * arg)565 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
566 unsigned int cmd, void __user *arg)
567 {
568 int err;
569
570 if (!q)
571 return -ENXIO;
572
573 switch (cmd) {
574 /*
575 * new sgv3 interface
576 */
577 case SG_GET_VERSION_NUM:
578 err = sg_get_version(arg);
579 break;
580 case SCSI_IOCTL_GET_IDLUN:
581 err = scsi_get_idlun(q, arg);
582 break;
583 case SCSI_IOCTL_GET_BUS_NUMBER:
584 err = scsi_get_bus(q, arg);
585 break;
586 case SG_SET_TIMEOUT:
587 err = sg_set_timeout(q, arg);
588 break;
589 case SG_GET_TIMEOUT:
590 err = sg_get_timeout(q);
591 break;
592 case SG_GET_RESERVED_SIZE:
593 err = sg_get_reserved_size(q, arg);
594 break;
595 case SG_SET_RESERVED_SIZE:
596 err = sg_set_reserved_size(q, arg);
597 break;
598 case SG_EMULATED_HOST:
599 err = sg_emulated_host(q, arg);
600 break;
601 case SG_IO: {
602 struct sg_io_hdr hdr;
603
604 err = -EFAULT;
605 if (copy_from_user(&hdr, arg, sizeof(hdr)))
606 break;
607 err = sg_io(q, bd_disk, &hdr, mode);
608 if (err == -EFAULT)
609 break;
610
611 if (copy_to_user(arg, &hdr, sizeof(hdr)))
612 err = -EFAULT;
613 break;
614 }
615 case CDROM_SEND_PACKET: {
616 struct cdrom_generic_command cgc;
617 struct sg_io_hdr hdr;
618
619 err = -EFAULT;
620 if (copy_from_user(&cgc, arg, sizeof(cgc)))
621 break;
622 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
623 memset(&hdr, 0, sizeof(hdr));
624 hdr.interface_id = 'S';
625 hdr.cmd_len = sizeof(cgc.cmd);
626 hdr.dxfer_len = cgc.buflen;
627 err = 0;
628 switch (cgc.data_direction) {
629 case CGC_DATA_UNKNOWN:
630 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
631 break;
632 case CGC_DATA_WRITE:
633 hdr.dxfer_direction = SG_DXFER_TO_DEV;
634 break;
635 case CGC_DATA_READ:
636 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
637 break;
638 case CGC_DATA_NONE:
639 hdr.dxfer_direction = SG_DXFER_NONE;
640 break;
641 default:
642 err = -EINVAL;
643 }
644 if (err)
645 break;
646
647 hdr.dxferp = cgc.buffer;
648 hdr.sbp = cgc.sense;
649 if (hdr.sbp)
650 hdr.mx_sb_len = sizeof(struct request_sense);
651 hdr.timeout = jiffies_to_msecs(cgc.timeout);
652 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
653 hdr.cmd_len = sizeof(cgc.cmd);
654
655 err = sg_io(q, bd_disk, &hdr, mode);
656 if (err == -EFAULT)
657 break;
658
659 if (hdr.status)
660 err = -EIO;
661
662 cgc.stat = err;
663 cgc.buflen = hdr.resid;
664 if (copy_to_user(arg, &cgc, sizeof(cgc)))
665 err = -EFAULT;
666
667 break;
668 }
669
670 /*
671 * old junk scsi send command ioctl
672 */
673 case SCSI_IOCTL_SEND_COMMAND:
674 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
675 err = -EINVAL;
676 if (!arg)
677 break;
678
679 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
680 break;
681 case CDROMCLOSETRAY:
682 err = blk_send_start_stop(q, bd_disk, 0x03);
683 break;
684 case CDROMEJECT:
685 err = blk_send_start_stop(q, bd_disk, 0x02);
686 break;
687 default:
688 err = -ENOTTY;
689 }
690
691 return err;
692 }
693 EXPORT_SYMBOL(scsi_cmd_ioctl);
694
scsi_verify_blk_ioctl(struct block_device * bd,unsigned int cmd)695 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
696 {
697 if (bd && bd == bd->bd_contains)
698 return 0;
699
700 /* Actually none of these is particularly useful on a partition,
701 * but they are safe.
702 */
703 switch (cmd) {
704 case SCSI_IOCTL_GET_IDLUN:
705 case SCSI_IOCTL_GET_BUS_NUMBER:
706 case SCSI_IOCTL_GET_PCI:
707 case SCSI_IOCTL_PROBE_HOST:
708 case SG_GET_VERSION_NUM:
709 case SG_SET_TIMEOUT:
710 case SG_GET_TIMEOUT:
711 case SG_GET_RESERVED_SIZE:
712 case SG_SET_RESERVED_SIZE:
713 case SG_EMULATED_HOST:
714 return 0;
715 case CDROM_GET_CAPABILITY:
716 /* Keep this until we remove the printk below. udev sends it
717 * and we do not want to spam dmesg about it. CD-ROMs do
718 * not have partitions, so we get here only for disks.
719 */
720 return -ENOIOCTLCMD;
721 default:
722 break;
723 }
724
725 if (capable(CAP_SYS_RAWIO))
726 return 0;
727
728 /* In particular, rule out all resets and host-specific ioctls. */
729 printk_ratelimited(KERN_WARNING
730 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
731
732 return -ENOIOCTLCMD;
733 }
734 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
735
scsi_cmd_blk_ioctl(struct block_device * bd,fmode_t mode,unsigned int cmd,void __user * arg)736 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
737 unsigned int cmd, void __user *arg)
738 {
739 int ret;
740
741 ret = scsi_verify_blk_ioctl(bd, cmd);
742 if (ret < 0)
743 return ret;
744
745 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
746 }
747 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
748
blk_scsi_ioctl_init(void)749 static int __init blk_scsi_ioctl_init(void)
750 {
751 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
752 return 0;
753 }
754 fs_initcall(blk_scsi_ioctl_init);
755