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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
37struct 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
42static struct blk_cmd_filter blk_default_cmd_filter;
43
44/* Command group 3 is reserved and should never be used. */
45const unsigned char scsi_command_size_tbl[8] =
46{
47 6, 10, 10, 12,
48 16, 12, 10, 10
49};
50EXPORT_SYMBOL(scsi_command_size_tbl);
51
52#include <scsi/sg.h>
53
54static 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
60static int scsi_get_idlun(struct request_queue *q, int __user *p)
61{
62 return put_user(0, p);
63}
64
65static int scsi_get_bus(struct request_queue *q, int __user *p)
66{
67 return put_user(0, p);
68}
69
70static int sg_get_timeout(struct request_queue *q)
71{
72 return jiffies_to_clock_t(q->sg_timeout);
73}
74
75static 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
85static 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
92static 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 */
112static int sg_emulated_host(struct request_queue *q, int __user *p)
113{
114 return put_user(1, p);
115}
116
117static 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
200int 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}
222EXPORT_SYMBOL(blk_verify_command);
223
224static 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
249static 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
285static 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 ssize_t ret = 0;
290 int writing = 0;
291 struct request *rq;
292 char sense[SCSI_SENSE_BUFFERSIZE];
293 struct bio *bio;
294
295 if (hdr->interface_id != 'S')
296 return -EINVAL;
297 if (hdr->cmd_len > BLK_MAX_CDB)
298 return -EINVAL;
299
300 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
301 return -EIO;
302
303 if (hdr->dxfer_len)
304 switch (hdr->dxfer_direction) {
305 default:
306 return -EINVAL;
307 case SG_DXFER_TO_DEV:
308 writing = 1;
309 break;
310 case SG_DXFER_TO_FROM_DEV:
311 case SG_DXFER_FROM_DEV:
312 break;
313 }
314
315 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
316 if (!rq)
317 return -ENOMEM;
318
319 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
320 blk_put_request(rq);
321 return -EFAULT;
322 }
323
324 if (hdr->iovec_count) {
325 size_t iov_data_len;
326 struct iovec *iov = NULL;
327
328 ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
329 0, NULL, &iov);
330 if (ret < 0) {
331 kfree(iov);
332 goto out;
333 }
334
335 iov_data_len = ret;
336 ret = 0;
337
338 /* SG_IO howto says that the shorter of the two wins */
339 if (hdr->dxfer_len < iov_data_len) {
340 hdr->iovec_count = iov_shorten(iov,
341 hdr->iovec_count,
342 hdr->dxfer_len);
343 iov_data_len = hdr->dxfer_len;
344 }
345
346 ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov,
347 hdr->iovec_count,
348 iov_data_len, GFP_KERNEL);
349 kfree(iov);
350 } else if (hdr->dxfer_len)
351 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
352 GFP_KERNEL);
353
354 if (ret)
355 goto out;
356
357 bio = rq->bio;
358 memset(sense, 0, sizeof(sense));
359 rq->sense = sense;
360 rq->sense_len = 0;
361 rq->retries = 0;
362
363 start_time = jiffies;
364
365 /* ignore return value. All information is passed back to caller
366 * (if he doesn't check that is his problem).
367 * N.B. a non-zero SCSI status is _not_ necessarily an error.
368 */
369 blk_execute_rq(q, bd_disk, rq, 0);
370
371 hdr->duration = jiffies_to_msecs(jiffies - start_time);
372
373 return blk_complete_sghdr_rq(rq, hdr, bio);
374out:
375 blk_put_request(rq);
376 return ret;
377}
378
379/**
380 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
381 * @file: file this ioctl operates on (optional)
382 * @q: request queue to send scsi commands down
383 * @disk: gendisk to operate on (option)
384 * @sic: userspace structure describing the command to perform
385 *
386 * Send down the scsi command described by @sic to the device below
387 * the request queue @q. If @file is non-NULL it's used to perform
388 * fine-grained permission checks that allow users to send down
389 * non-destructive SCSI commands. If the caller has a struct gendisk
390 * available it should be passed in as @disk to allow the low level
391 * driver to use the information contained in it. A non-NULL @disk
392 * is only allowed if the caller knows that the low level driver doesn't
393 * need it (e.g. in the scsi subsystem).
394 *
395 * Notes:
396 * - This interface is deprecated - users should use the SG_IO
397 * interface instead, as this is a more flexible approach to
398 * performing SCSI commands on a device.
399 * - The SCSI command length is determined by examining the 1st byte
400 * of the given command. There is no way to override this.
401 * - Data transfers are limited to PAGE_SIZE
402 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
403 * accommodate the sense buffer when an error occurs.
404 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
405 * old code will not be surprised.
406 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
407 * a negative return and the Unix error code in 'errno'.
408 * If the SCSI command succeeds then 0 is returned.
409 * Positive numbers returned are the compacted SCSI error codes (4
410 * bytes in one int) where the lowest byte is the SCSI status.
411 */
412#define OMAX_SB_LEN 16 /* For backward compatibility */
413int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
414 struct scsi_ioctl_command __user *sic)
415{
416 struct request *rq;
417 int err;
418 unsigned int in_len, out_len, bytes, opcode, cmdlen;
419 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
420
421 if (!sic)
422 return -EINVAL;
423
424 /*
425 * get in an out lengths, verify they don't exceed a page worth of data
426 */
427 if (get_user(in_len, &sic->inlen))
428 return -EFAULT;
429 if (get_user(out_len, &sic->outlen))
430 return -EFAULT;
431 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
432 return -EINVAL;
433 if (get_user(opcode, sic->data))
434 return -EFAULT;
435
436 bytes = max(in_len, out_len);
437 if (bytes) {
438 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
439 if (!buffer)
440 return -ENOMEM;
441
442 }
443
444 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
445
446 cmdlen = COMMAND_SIZE(opcode);
447
448 /*
449 * get command and data to send to device, if any
450 */
451 err = -EFAULT;
452 rq->cmd_len = cmdlen;
453 if (copy_from_user(rq->cmd, sic->data, cmdlen))
454 goto error;
455
456 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
457 goto error;
458
459 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
460 if (err)
461 goto error;
462
463 /* default. possible overriden later */
464 rq->retries = 5;
465
466 switch (opcode) {
467 case SEND_DIAGNOSTIC:
468 case FORMAT_UNIT:
469 rq->timeout = FORMAT_UNIT_TIMEOUT;
470 rq->retries = 1;
471 break;
472 case START_STOP:
473 rq->timeout = START_STOP_TIMEOUT;
474 break;
475 case MOVE_MEDIUM:
476 rq->timeout = MOVE_MEDIUM_TIMEOUT;
477 break;
478 case READ_ELEMENT_STATUS:
479 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
480 break;
481 case READ_DEFECT_DATA:
482 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
483 rq->retries = 1;
484 break;
485 default:
486 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
487 break;
488 }
489
490 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
491 err = DRIVER_ERROR << 24;
492 goto out;
493 }
494
495 memset(sense, 0, sizeof(sense));
496 rq->sense = sense;
497 rq->sense_len = 0;
498 rq->cmd_type = REQ_TYPE_BLOCK_PC;
499
500 blk_execute_rq(q, disk, rq, 0);
501
502out:
503 err = rq->errors & 0xff; /* only 8 bit SCSI status */
504 if (err) {
505 if (rq->sense_len && rq->sense) {
506 bytes = (OMAX_SB_LEN > rq->sense_len) ?
507 rq->sense_len : OMAX_SB_LEN;
508 if (copy_to_user(sic->data, rq->sense, bytes))
509 err = -EFAULT;
510 }
511 } else {
512 if (copy_to_user(sic->data, buffer, out_len))
513 err = -EFAULT;
514 }
515
516error:
517 kfree(buffer);
518 blk_put_request(rq);
519 return err;
520}
521EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
522
523/* Send basic block requests */
524static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
525 int cmd, int data)
526{
527 struct request *rq;
528 int err;
529
530 rq = blk_get_request(q, WRITE, __GFP_WAIT);
531 rq->cmd_type = REQ_TYPE_BLOCK_PC;
532 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
533 rq->cmd[0] = cmd;
534 rq->cmd[4] = data;
535 rq->cmd_len = 6;
536 err = blk_execute_rq(q, bd_disk, rq, 0);
537 blk_put_request(rq);
538
539 return err;
540}
541
542static inline int blk_send_start_stop(struct request_queue *q,
543 struct gendisk *bd_disk, int data)
544{
545 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
546}
547
548int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
549 unsigned int cmd, void __user *arg)
550{
551 int err;
552
553 if (!q)
554 return -ENXIO;
555
556 switch (cmd) {
557 /*
558 * new sgv3 interface
559 */
560 case SG_GET_VERSION_NUM:
561 err = sg_get_version(arg);
562 break;
563 case SCSI_IOCTL_GET_IDLUN:
564 err = scsi_get_idlun(q, arg);
565 break;
566 case SCSI_IOCTL_GET_BUS_NUMBER:
567 err = scsi_get_bus(q, arg);
568 break;
569 case SG_SET_TIMEOUT:
570 err = sg_set_timeout(q, arg);
571 break;
572 case SG_GET_TIMEOUT:
573 err = sg_get_timeout(q);
574 break;
575 case SG_GET_RESERVED_SIZE:
576 err = sg_get_reserved_size(q, arg);
577 break;
578 case SG_SET_RESERVED_SIZE:
579 err = sg_set_reserved_size(q, arg);
580 break;
581 case SG_EMULATED_HOST:
582 err = sg_emulated_host(q, arg);
583 break;
584 case SG_IO: {
585 struct sg_io_hdr hdr;
586
587 err = -EFAULT;
588 if (copy_from_user(&hdr, arg, sizeof(hdr)))
589 break;
590 err = sg_io(q, bd_disk, &hdr, mode);
591 if (err == -EFAULT)
592 break;
593
594 if (copy_to_user(arg, &hdr, sizeof(hdr)))
595 err = -EFAULT;
596 break;
597 }
598 case CDROM_SEND_PACKET: {
599 struct cdrom_generic_command cgc;
600 struct sg_io_hdr hdr;
601
602 err = -EFAULT;
603 if (copy_from_user(&cgc, arg, sizeof(cgc)))
604 break;
605 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
606 memset(&hdr, 0, sizeof(hdr));
607 hdr.interface_id = 'S';
608 hdr.cmd_len = sizeof(cgc.cmd);
609 hdr.dxfer_len = cgc.buflen;
610 err = 0;
611 switch (cgc.data_direction) {
612 case CGC_DATA_UNKNOWN:
613 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
614 break;
615 case CGC_DATA_WRITE:
616 hdr.dxfer_direction = SG_DXFER_TO_DEV;
617 break;
618 case CGC_DATA_READ:
619 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
620 break;
621 case CGC_DATA_NONE:
622 hdr.dxfer_direction = SG_DXFER_NONE;
623 break;
624 default:
625 err = -EINVAL;
626 }
627 if (err)
628 break;
629
630 hdr.dxferp = cgc.buffer;
631 hdr.sbp = cgc.sense;
632 if (hdr.sbp)
633 hdr.mx_sb_len = sizeof(struct request_sense);
634 hdr.timeout = jiffies_to_msecs(cgc.timeout);
635 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
636 hdr.cmd_len = sizeof(cgc.cmd);
637
638 err = sg_io(q, bd_disk, &hdr, mode);
639 if (err == -EFAULT)
640 break;
641
642 if (hdr.status)
643 err = -EIO;
644
645 cgc.stat = err;
646 cgc.buflen = hdr.resid;
647 if (copy_to_user(arg, &cgc, sizeof(cgc)))
648 err = -EFAULT;
649
650 break;
651 }
652
653 /*
654 * old junk scsi send command ioctl
655 */
656 case SCSI_IOCTL_SEND_COMMAND:
657 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
658 err = -EINVAL;
659 if (!arg)
660 break;
661
662 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
663 break;
664 case CDROMCLOSETRAY:
665 err = blk_send_start_stop(q, bd_disk, 0x03);
666 break;
667 case CDROMEJECT:
668 err = blk_send_start_stop(q, bd_disk, 0x02);
669 break;
670 default:
671 err = -ENOTTY;
672 }
673
674 return err;
675}
676EXPORT_SYMBOL(scsi_cmd_ioctl);
677
678int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
679{
680 if (bd && bd == bd->bd_contains)
681 return 0;
682
683 /* Actually none of these is particularly useful on a partition,
684 * but they are safe.
685 */
686 switch (cmd) {
687 case SCSI_IOCTL_GET_IDLUN:
688 case SCSI_IOCTL_GET_BUS_NUMBER:
689 case SCSI_IOCTL_GET_PCI:
690 case SCSI_IOCTL_PROBE_HOST:
691 case SG_GET_VERSION_NUM:
692 case SG_SET_TIMEOUT:
693 case SG_GET_TIMEOUT:
694 case SG_GET_RESERVED_SIZE:
695 case SG_SET_RESERVED_SIZE:
696 case SG_EMULATED_HOST:
697 return 0;
698 case CDROM_GET_CAPABILITY:
699 /* Keep this until we remove the printk below. udev sends it
700 * and we do not want to spam dmesg about it. CD-ROMs do
701 * not have partitions, so we get here only for disks.
702 */
703 return -ENOIOCTLCMD;
704 default:
705 break;
706 }
707
708 if (capable(CAP_SYS_RAWIO))
709 return 0;
710
711 /* In particular, rule out all resets and host-specific ioctls. */
712 printk_ratelimited(KERN_WARNING
713 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
714
715 return -ENOIOCTLCMD;
716}
717EXPORT_SYMBOL(scsi_verify_blk_ioctl);
718
719int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
720 unsigned int cmd, void __user *arg)
721{
722 int ret;
723
724 ret = scsi_verify_blk_ioctl(bd, cmd);
725 if (ret < 0)
726 return ret;
727
728 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
729}
730EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
731
732static int __init blk_scsi_ioctl_init(void)
733{
734 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
735 return 0;
736}
737fs_initcall(blk_scsi_ioctl_init);