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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/slab.h>
28#include <linux/times.h>
29#include <asm/uaccess.h>
30
31#include <scsi/scsi.h>
32#include <scsi/scsi_ioctl.h>
33#include <scsi/scsi_cmnd.h>
34
35struct blk_cmd_filter {
36 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
37 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
38};
39
40static struct blk_cmd_filter blk_default_cmd_filter;
41
42/* Command group 3 is reserved and should never be used. */
43const unsigned char scsi_command_size_tbl[8] =
44{
45 6, 10, 10, 12,
46 16, 12, 10, 10
47};
48EXPORT_SYMBOL(scsi_command_size_tbl);
49
50#include <scsi/sg.h>
51
52static int sg_get_version(int __user *p)
53{
54 static const int sg_version_num = 30527;
55 return put_user(sg_version_num, p);
56}
57
58static int scsi_get_idlun(struct request_queue *q, int __user *p)
59{
60 return put_user(0, p);
61}
62
63static int scsi_get_bus(struct request_queue *q, int __user *p)
64{
65 return put_user(0, p);
66}
67
68static int sg_get_timeout(struct request_queue *q)
69{
70 return jiffies_to_clock_t(q->sg_timeout);
71}
72
73static int sg_set_timeout(struct request_queue *q, int __user *p)
74{
75 int timeout, err = get_user(timeout, p);
76
77 if (!err)
78 q->sg_timeout = clock_t_to_jiffies(timeout);
79
80 return err;
81}
82
83static int sg_get_reserved_size(struct request_queue *q, int __user *p)
84{
85 unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
86
87 return put_user(val, p);
88}
89
90static int sg_set_reserved_size(struct request_queue *q, int __user *p)
91{
92 int size, err = get_user(size, p);
93
94 if (err)
95 return err;
96
97 if (size < 0)
98 return -EINVAL;
99 if (size > (queue_max_sectors(q) << 9))
100 size = queue_max_sectors(q) << 9;
101
102 q->sg_reserved_size = size;
103 return 0;
104}
105
106/*
107 * will always return that we are ATAPI even for a real SCSI drive, I'm not
108 * so sure this is worth doing anything about (why would you care??)
109 */
110static int sg_emulated_host(struct request_queue *q, int __user *p)
111{
112 return put_user(1, p);
113}
114
115static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
116{
117 /* Basic read-only commands */
118 __set_bit(TEST_UNIT_READY, filter->read_ok);
119 __set_bit(REQUEST_SENSE, filter->read_ok);
120 __set_bit(READ_6, filter->read_ok);
121 __set_bit(READ_10, filter->read_ok);
122 __set_bit(READ_12, filter->read_ok);
123 __set_bit(READ_16, filter->read_ok);
124 __set_bit(READ_BUFFER, filter->read_ok);
125 __set_bit(READ_DEFECT_DATA, filter->read_ok);
126 __set_bit(READ_CAPACITY, filter->read_ok);
127 __set_bit(READ_LONG, filter->read_ok);
128 __set_bit(INQUIRY, filter->read_ok);
129 __set_bit(MODE_SENSE, filter->read_ok);
130 __set_bit(MODE_SENSE_10, filter->read_ok);
131 __set_bit(LOG_SENSE, filter->read_ok);
132 __set_bit(START_STOP, filter->read_ok);
133 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
134 __set_bit(VERIFY_16, filter->read_ok);
135 __set_bit(REPORT_LUNS, filter->read_ok);
136 __set_bit(SERVICE_ACTION_IN, filter->read_ok);
137 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
138 __set_bit(MAINTENANCE_IN, filter->read_ok);
139 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
140
141 /* Audio CD commands */
142 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
143 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
144 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
145 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
146 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
147
148 /* CD/DVD data reading */
149 __set_bit(GPCMD_READ_CD, filter->read_ok);
150 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
151 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
152 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
153 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
154 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
155 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
156 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
157 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
158 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
159 __set_bit(GPCMD_SCAN, filter->read_ok);
160 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
161 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
162 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
163 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
164 __set_bit(GPCMD_SEEK, filter->read_ok);
165 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
166
167 /* Basic writing commands */
168 __set_bit(WRITE_6, filter->write_ok);
169 __set_bit(WRITE_10, filter->write_ok);
170 __set_bit(WRITE_VERIFY, filter->write_ok);
171 __set_bit(WRITE_12, filter->write_ok);
172 __set_bit(WRITE_VERIFY_12, filter->write_ok);
173 __set_bit(WRITE_16, filter->write_ok);
174 __set_bit(WRITE_LONG, filter->write_ok);
175 __set_bit(WRITE_LONG_2, filter->write_ok);
176 __set_bit(ERASE, filter->write_ok);
177 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
178 __set_bit(MODE_SELECT, filter->write_ok);
179 __set_bit(LOG_SELECT, filter->write_ok);
180 __set_bit(GPCMD_BLANK, filter->write_ok);
181 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
182 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
183 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
184 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
185 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
186 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
187 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
188 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
189 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
190 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
191 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
192 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
193 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
194 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
195 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
196}
197
198int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
199{
200 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
201
202 /* root can do any command. */
203 if (capable(CAP_SYS_RAWIO))
204 return 0;
205
206 /* if there's no filter set, assume we're filtering everything out */
207 if (!filter)
208 return -EPERM;
209
210 /* Anybody who can open the device can do a read-safe command */
211 if (test_bit(cmd[0], filter->read_ok))
212 return 0;
213
214 /* Write-safe commands require a writable open */
215 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
216 return 0;
217
218 return -EPERM;
219}
220EXPORT_SYMBOL(blk_verify_command);
221
222static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
223 struct sg_io_hdr *hdr, fmode_t mode)
224{
225 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
226 return -EFAULT;
227 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
228 return -EPERM;
229
230 /*
231 * fill in request structure
232 */
233 rq->cmd_len = hdr->cmd_len;
234 rq->cmd_type = REQ_TYPE_BLOCK_PC;
235
236 rq->timeout = msecs_to_jiffies(hdr->timeout);
237 if (!rq->timeout)
238 rq->timeout = q->sg_timeout;
239 if (!rq->timeout)
240 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
241 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
242 rq->timeout = BLK_MIN_SG_TIMEOUT;
243
244 return 0;
245}
246
247static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
248 struct bio *bio)
249{
250 int r, ret = 0;
251
252 /*
253 * fill in all the output members
254 */
255 hdr->status = rq->errors & 0xff;
256 hdr->masked_status = status_byte(rq->errors);
257 hdr->msg_status = msg_byte(rq->errors);
258 hdr->host_status = host_byte(rq->errors);
259 hdr->driver_status = driver_byte(rq->errors);
260 hdr->info = 0;
261 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
262 hdr->info |= SG_INFO_CHECK;
263 hdr->resid = rq->resid_len;
264 hdr->sb_len_wr = 0;
265
266 if (rq->sense_len && hdr->sbp) {
267 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
268
269 if (!copy_to_user(hdr->sbp, rq->sense, len))
270 hdr->sb_len_wr = len;
271 else
272 ret = -EFAULT;
273 }
274
275 r = blk_rq_unmap_user(bio);
276 if (!ret)
277 ret = r;
278 blk_put_request(rq);
279
280 return ret;
281}
282
283static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
284 struct sg_io_hdr *hdr, fmode_t mode)
285{
286 unsigned long start_time;
287 int writing = 0, ret = 0;
288 struct request *rq;
289 char sense[SCSI_SENSE_BUFFERSIZE];
290 struct bio *bio;
291
292 if (hdr->interface_id != 'S')
293 return -EINVAL;
294 if (hdr->cmd_len > BLK_MAX_CDB)
295 return -EINVAL;
296
297 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
298 return -EIO;
299
300 if (hdr->dxfer_len)
301 switch (hdr->dxfer_direction) {
302 default:
303 return -EINVAL;
304 case SG_DXFER_TO_DEV:
305 writing = 1;
306 break;
307 case SG_DXFER_TO_FROM_DEV:
308 case SG_DXFER_FROM_DEV:
309 break;
310 }
311
312 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
313 if (!rq)
314 return -ENOMEM;
315
316 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
317 blk_put_request(rq);
318 return -EFAULT;
319 }
320
321 if (hdr->iovec_count) {
322 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
323 size_t iov_data_len;
324 struct sg_iovec *sg_iov;
325 struct iovec *iov;
326 int i;
327
328 sg_iov = kmalloc(size, GFP_KERNEL);
329 if (!sg_iov) {
330 ret = -ENOMEM;
331 goto out;
332 }
333
334 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
335 kfree(sg_iov);
336 ret = -EFAULT;
337 goto out;
338 }
339
340 /*
341 * Sum up the vecs, making sure they don't overflow
342 */
343 iov = (struct iovec *) sg_iov;
344 iov_data_len = 0;
345 for (i = 0; i < hdr->iovec_count; i++) {
346 if (iov_data_len + iov[i].iov_len < iov_data_len) {
347 kfree(sg_iov);
348 ret = -EINVAL;
349 goto out;
350 }
351 iov_data_len += iov[i].iov_len;
352 }
353
354 /* SG_IO howto says that the shorter of the two wins */
355 if (hdr->dxfer_len < iov_data_len) {
356 hdr->iovec_count = iov_shorten(iov,
357 hdr->iovec_count,
358 hdr->dxfer_len);
359 iov_data_len = hdr->dxfer_len;
360 }
361
362 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
363 iov_data_len, GFP_KERNEL);
364 kfree(sg_iov);
365 } else if (hdr->dxfer_len)
366 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
367 GFP_KERNEL);
368
369 if (ret)
370 goto out;
371
372 bio = rq->bio;
373 memset(sense, 0, sizeof(sense));
374 rq->sense = sense;
375 rq->sense_len = 0;
376 rq->retries = 0;
377
378 start_time = jiffies;
379
380 /* ignore return value. All information is passed back to caller
381 * (if he doesn't check that is his problem).
382 * N.B. a non-zero SCSI status is _not_ necessarily an error.
383 */
384 blk_execute_rq(q, bd_disk, rq, 0);
385
386 hdr->duration = jiffies_to_msecs(jiffies - start_time);
387
388 return blk_complete_sghdr_rq(rq, hdr, bio);
389out:
390 blk_put_request(rq);
391 return ret;
392}
393
394/**
395 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
396 * @file: file this ioctl operates on (optional)
397 * @q: request queue to send scsi commands down
398 * @disk: gendisk to operate on (option)
399 * @sic: userspace structure describing the command to perform
400 *
401 * Send down the scsi command described by @sic to the device below
402 * the request queue @q. If @file is non-NULL it's used to perform
403 * fine-grained permission checks that allow users to send down
404 * non-destructive SCSI commands. If the caller has a struct gendisk
405 * available it should be passed in as @disk to allow the low level
406 * driver to use the information contained in it. A non-NULL @disk
407 * is only allowed if the caller knows that the low level driver doesn't
408 * need it (e.g. in the scsi subsystem).
409 *
410 * Notes:
411 * - This interface is deprecated - users should use the SG_IO
412 * interface instead, as this is a more flexible approach to
413 * performing SCSI commands on a device.
414 * - The SCSI command length is determined by examining the 1st byte
415 * of the given command. There is no way to override this.
416 * - Data transfers are limited to PAGE_SIZE
417 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
418 * accommodate the sense buffer when an error occurs.
419 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
420 * old code will not be surprised.
421 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
422 * a negative return and the Unix error code in 'errno'.
423 * If the SCSI command succeeds then 0 is returned.
424 * Positive numbers returned are the compacted SCSI error codes (4
425 * bytes in one int) where the lowest byte is the SCSI status.
426 */
427#define OMAX_SB_LEN 16 /* For backward compatibility */
428int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
429 struct scsi_ioctl_command __user *sic)
430{
431 struct request *rq;
432 int err;
433 unsigned int in_len, out_len, bytes, opcode, cmdlen;
434 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
435
436 if (!sic)
437 return -EINVAL;
438
439 /*
440 * get in an out lengths, verify they don't exceed a page worth of data
441 */
442 if (get_user(in_len, &sic->inlen))
443 return -EFAULT;
444 if (get_user(out_len, &sic->outlen))
445 return -EFAULT;
446 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
447 return -EINVAL;
448 if (get_user(opcode, sic->data))
449 return -EFAULT;
450
451 bytes = max(in_len, out_len);
452 if (bytes) {
453 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
454 if (!buffer)
455 return -ENOMEM;
456
457 }
458
459 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
460
461 cmdlen = COMMAND_SIZE(opcode);
462
463 /*
464 * get command and data to send to device, if any
465 */
466 err = -EFAULT;
467 rq->cmd_len = cmdlen;
468 if (copy_from_user(rq->cmd, sic->data, cmdlen))
469 goto error;
470
471 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
472 goto error;
473
474 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
475 if (err)
476 goto error;
477
478 /* default. possible overriden later */
479 rq->retries = 5;
480
481 switch (opcode) {
482 case SEND_DIAGNOSTIC:
483 case FORMAT_UNIT:
484 rq->timeout = FORMAT_UNIT_TIMEOUT;
485 rq->retries = 1;
486 break;
487 case START_STOP:
488 rq->timeout = START_STOP_TIMEOUT;
489 break;
490 case MOVE_MEDIUM:
491 rq->timeout = MOVE_MEDIUM_TIMEOUT;
492 break;
493 case READ_ELEMENT_STATUS:
494 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
495 break;
496 case READ_DEFECT_DATA:
497 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
498 rq->retries = 1;
499 break;
500 default:
501 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
502 break;
503 }
504
505 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
506 err = DRIVER_ERROR << 24;
507 goto out;
508 }
509
510 memset(sense, 0, sizeof(sense));
511 rq->sense = sense;
512 rq->sense_len = 0;
513 rq->cmd_type = REQ_TYPE_BLOCK_PC;
514
515 blk_execute_rq(q, disk, rq, 0);
516
517out:
518 err = rq->errors & 0xff; /* only 8 bit SCSI status */
519 if (err) {
520 if (rq->sense_len && rq->sense) {
521 bytes = (OMAX_SB_LEN > rq->sense_len) ?
522 rq->sense_len : OMAX_SB_LEN;
523 if (copy_to_user(sic->data, rq->sense, bytes))
524 err = -EFAULT;
525 }
526 } else {
527 if (copy_to_user(sic->data, buffer, out_len))
528 err = -EFAULT;
529 }
530
531error:
532 kfree(buffer);
533 blk_put_request(rq);
534 return err;
535}
536EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
537
538/* Send basic block requests */
539static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
540 int cmd, int data)
541{
542 struct request *rq;
543 int err;
544
545 rq = blk_get_request(q, WRITE, __GFP_WAIT);
546 rq->cmd_type = REQ_TYPE_BLOCK_PC;
547 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
548 rq->cmd[0] = cmd;
549 rq->cmd[4] = data;
550 rq->cmd_len = 6;
551 err = blk_execute_rq(q, bd_disk, rq, 0);
552 blk_put_request(rq);
553
554 return err;
555}
556
557static inline int blk_send_start_stop(struct request_queue *q,
558 struct gendisk *bd_disk, int data)
559{
560 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
561}
562
563int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
564 unsigned int cmd, void __user *arg)
565{
566 int err;
567
568 if (!q || blk_get_queue(q))
569 return -ENXIO;
570
571 switch (cmd) {
572 /*
573 * new sgv3 interface
574 */
575 case SG_GET_VERSION_NUM:
576 err = sg_get_version(arg);
577 break;
578 case SCSI_IOCTL_GET_IDLUN:
579 err = scsi_get_idlun(q, arg);
580 break;
581 case SCSI_IOCTL_GET_BUS_NUMBER:
582 err = scsi_get_bus(q, arg);
583 break;
584 case SG_SET_TIMEOUT:
585 err = sg_set_timeout(q, arg);
586 break;
587 case SG_GET_TIMEOUT:
588 err = sg_get_timeout(q);
589 break;
590 case SG_GET_RESERVED_SIZE:
591 err = sg_get_reserved_size(q, arg);
592 break;
593 case SG_SET_RESERVED_SIZE:
594 err = sg_set_reserved_size(q, arg);
595 break;
596 case SG_EMULATED_HOST:
597 err = sg_emulated_host(q, arg);
598 break;
599 case SG_IO: {
600 struct sg_io_hdr hdr;
601
602 err = -EFAULT;
603 if (copy_from_user(&hdr, arg, sizeof(hdr)))
604 break;
605 err = sg_io(q, bd_disk, &hdr, mode);
606 if (err == -EFAULT)
607 break;
608
609 if (copy_to_user(arg, &hdr, sizeof(hdr)))
610 err = -EFAULT;
611 break;
612 }
613 case CDROM_SEND_PACKET: {
614 struct cdrom_generic_command cgc;
615 struct sg_io_hdr hdr;
616
617 err = -EFAULT;
618 if (copy_from_user(&cgc, arg, sizeof(cgc)))
619 break;
620 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
621 memset(&hdr, 0, sizeof(hdr));
622 hdr.interface_id = 'S';
623 hdr.cmd_len = sizeof(cgc.cmd);
624 hdr.dxfer_len = cgc.buflen;
625 err = 0;
626 switch (cgc.data_direction) {
627 case CGC_DATA_UNKNOWN:
628 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
629 break;
630 case CGC_DATA_WRITE:
631 hdr.dxfer_direction = SG_DXFER_TO_DEV;
632 break;
633 case CGC_DATA_READ:
634 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
635 break;
636 case CGC_DATA_NONE:
637 hdr.dxfer_direction = SG_DXFER_NONE;
638 break;
639 default:
640 err = -EINVAL;
641 }
642 if (err)
643 break;
644
645 hdr.dxferp = cgc.buffer;
646 hdr.sbp = cgc.sense;
647 if (hdr.sbp)
648 hdr.mx_sb_len = sizeof(struct request_sense);
649 hdr.timeout = jiffies_to_msecs(cgc.timeout);
650 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
651 hdr.cmd_len = sizeof(cgc.cmd);
652
653 err = sg_io(q, bd_disk, &hdr, mode);
654 if (err == -EFAULT)
655 break;
656
657 if (hdr.status)
658 err = -EIO;
659
660 cgc.stat = err;
661 cgc.buflen = hdr.resid;
662 if (copy_to_user(arg, &cgc, sizeof(cgc)))
663 err = -EFAULT;
664
665 break;
666 }
667
668 /*
669 * old junk scsi send command ioctl
670 */
671 case SCSI_IOCTL_SEND_COMMAND:
672 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
673 err = -EINVAL;
674 if (!arg)
675 break;
676
677 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
678 break;
679 case CDROMCLOSETRAY:
680 err = blk_send_start_stop(q, bd_disk, 0x03);
681 break;
682 case CDROMEJECT:
683 err = blk_send_start_stop(q, bd_disk, 0x02);
684 break;
685 default:
686 err = -ENOTTY;
687 }
688
689 blk_put_queue(q);
690 return err;
691}
692EXPORT_SYMBOL(scsi_cmd_ioctl);
693
694static int __init blk_scsi_ioctl_init(void)
695{
696 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
697 return 0;
698}
699fs_initcall(blk_scsi_ioctl_init);
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 <asm/uaccess.h>
31
32#include <scsi/scsi.h>
33#include <scsi/scsi_ioctl.h>
34#include <scsi/scsi_cmnd.h>
35
36struct blk_cmd_filter {
37 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
38 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
39};
40
41static struct blk_cmd_filter blk_default_cmd_filter;
42
43/* Command group 3 is reserved and should never be used. */
44const unsigned char scsi_command_size_tbl[8] =
45{
46 6, 10, 10, 12,
47 16, 12, 10, 10
48};
49EXPORT_SYMBOL(scsi_command_size_tbl);
50
51#include <scsi/sg.h>
52
53static int sg_get_version(int __user *p)
54{
55 static const int sg_version_num = 30527;
56 return put_user(sg_version_num, p);
57}
58
59static int scsi_get_idlun(struct request_queue *q, int __user *p)
60{
61 return put_user(0, p);
62}
63
64static int scsi_get_bus(struct request_queue *q, int __user *p)
65{
66 return put_user(0, p);
67}
68
69static int sg_get_timeout(struct request_queue *q)
70{
71 return jiffies_to_clock_t(q->sg_timeout);
72}
73
74static int sg_set_timeout(struct request_queue *q, int __user *p)
75{
76 int timeout, err = get_user(timeout, p);
77
78 if (!err)
79 q->sg_timeout = clock_t_to_jiffies(timeout);
80
81 return err;
82}
83
84static int sg_get_reserved_size(struct request_queue *q, int __user *p)
85{
86 unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
87
88 return put_user(val, p);
89}
90
91static int sg_set_reserved_size(struct request_queue *q, int __user *p)
92{
93 int size, err = get_user(size, p);
94
95 if (err)
96 return err;
97
98 if (size < 0)
99 return -EINVAL;
100 if (size > (queue_max_sectors(q) << 9))
101 size = queue_max_sectors(q) << 9;
102
103 q->sg_reserved_size = size;
104 return 0;
105}
106
107/*
108 * will always return that we are ATAPI even for a real SCSI drive, I'm not
109 * so sure this is worth doing anything about (why would you care??)
110 */
111static int sg_emulated_host(struct request_queue *q, int __user *p)
112{
113 return put_user(1, p);
114}
115
116static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
117{
118 /* Basic read-only commands */
119 __set_bit(TEST_UNIT_READY, filter->read_ok);
120 __set_bit(REQUEST_SENSE, filter->read_ok);
121 __set_bit(READ_6, filter->read_ok);
122 __set_bit(READ_10, filter->read_ok);
123 __set_bit(READ_12, filter->read_ok);
124 __set_bit(READ_16, filter->read_ok);
125 __set_bit(READ_BUFFER, filter->read_ok);
126 __set_bit(READ_DEFECT_DATA, filter->read_ok);
127 __set_bit(READ_CAPACITY, filter->read_ok);
128 __set_bit(READ_LONG, filter->read_ok);
129 __set_bit(INQUIRY, filter->read_ok);
130 __set_bit(MODE_SENSE, filter->read_ok);
131 __set_bit(MODE_SENSE_10, filter->read_ok);
132 __set_bit(LOG_SENSE, filter->read_ok);
133 __set_bit(START_STOP, filter->read_ok);
134 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
135 __set_bit(VERIFY_16, filter->read_ok);
136 __set_bit(REPORT_LUNS, filter->read_ok);
137 __set_bit(SERVICE_ACTION_IN, filter->read_ok);
138 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
139 __set_bit(MAINTENANCE_IN, filter->read_ok);
140 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
141
142 /* Audio CD commands */
143 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
144 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
145 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
146 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
147 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
148
149 /* CD/DVD data reading */
150 __set_bit(GPCMD_READ_CD, filter->read_ok);
151 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
152 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
153 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
154 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
155 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
156 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
157 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
158 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
159 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
160 __set_bit(GPCMD_SCAN, filter->read_ok);
161 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
162 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
163 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
164 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
165 __set_bit(GPCMD_SEEK, filter->read_ok);
166 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
167
168 /* Basic writing commands */
169 __set_bit(WRITE_6, filter->write_ok);
170 __set_bit(WRITE_10, filter->write_ok);
171 __set_bit(WRITE_VERIFY, filter->write_ok);
172 __set_bit(WRITE_12, filter->write_ok);
173 __set_bit(WRITE_VERIFY_12, filter->write_ok);
174 __set_bit(WRITE_16, filter->write_ok);
175 __set_bit(WRITE_LONG, filter->write_ok);
176 __set_bit(WRITE_LONG_2, filter->write_ok);
177 __set_bit(ERASE, filter->write_ok);
178 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
179 __set_bit(MODE_SELECT, filter->write_ok);
180 __set_bit(LOG_SELECT, filter->write_ok);
181 __set_bit(GPCMD_BLANK, filter->write_ok);
182 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
183 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
184 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
185 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
186 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
187 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
188 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
189 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
190 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
191 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
192 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
193 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
194 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
195 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
196 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
197}
198
199int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
200{
201 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
202
203 /* root can do any command. */
204 if (capable(CAP_SYS_RAWIO))
205 return 0;
206
207 /* if there's no filter set, assume we're filtering everything out */
208 if (!filter)
209 return -EPERM;
210
211 /* Anybody who can open the device can do a read-safe command */
212 if (test_bit(cmd[0], filter->read_ok))
213 return 0;
214
215 /* Write-safe commands require a writable open */
216 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
217 return 0;
218
219 return -EPERM;
220}
221EXPORT_SYMBOL(blk_verify_command);
222
223static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
224 struct sg_io_hdr *hdr, fmode_t mode)
225{
226 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
227 return -EFAULT;
228 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
229 return -EPERM;
230
231 /*
232 * fill in request structure
233 */
234 rq->cmd_len = hdr->cmd_len;
235 rq->cmd_type = REQ_TYPE_BLOCK_PC;
236
237 rq->timeout = msecs_to_jiffies(hdr->timeout);
238 if (!rq->timeout)
239 rq->timeout = q->sg_timeout;
240 if (!rq->timeout)
241 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
242 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
243 rq->timeout = BLK_MIN_SG_TIMEOUT;
244
245 return 0;
246}
247
248static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
249 struct bio *bio)
250{
251 int r, ret = 0;
252
253 /*
254 * fill in all the output members
255 */
256 hdr->status = rq->errors & 0xff;
257 hdr->masked_status = status_byte(rq->errors);
258 hdr->msg_status = msg_byte(rq->errors);
259 hdr->host_status = host_byte(rq->errors);
260 hdr->driver_status = driver_byte(rq->errors);
261 hdr->info = 0;
262 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
263 hdr->info |= SG_INFO_CHECK;
264 hdr->resid = rq->resid_len;
265 hdr->sb_len_wr = 0;
266
267 if (rq->sense_len && hdr->sbp) {
268 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
269
270 if (!copy_to_user(hdr->sbp, rq->sense, len))
271 hdr->sb_len_wr = len;
272 else
273 ret = -EFAULT;
274 }
275
276 r = blk_rq_unmap_user(bio);
277 if (!ret)
278 ret = r;
279 blk_put_request(rq);
280
281 return ret;
282}
283
284static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
285 struct sg_io_hdr *hdr, fmode_t mode)
286{
287 unsigned long start_time;
288 int writing = 0, ret = 0;
289 struct request *rq;
290 char sense[SCSI_SENSE_BUFFERSIZE];
291 struct bio *bio;
292
293 if (hdr->interface_id != 'S')
294 return -EINVAL;
295 if (hdr->cmd_len > BLK_MAX_CDB)
296 return -EINVAL;
297
298 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
299 return -EIO;
300
301 if (hdr->dxfer_len)
302 switch (hdr->dxfer_direction) {
303 default:
304 return -EINVAL;
305 case SG_DXFER_TO_DEV:
306 writing = 1;
307 break;
308 case SG_DXFER_TO_FROM_DEV:
309 case SG_DXFER_FROM_DEV:
310 break;
311 }
312
313 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
314 if (!rq)
315 return -ENOMEM;
316
317 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
318 blk_put_request(rq);
319 return -EFAULT;
320 }
321
322 if (hdr->iovec_count) {
323 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
324 size_t iov_data_len;
325 struct sg_iovec *sg_iov;
326 struct iovec *iov;
327 int i;
328
329 sg_iov = kmalloc(size, GFP_KERNEL);
330 if (!sg_iov) {
331 ret = -ENOMEM;
332 goto out;
333 }
334
335 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
336 kfree(sg_iov);
337 ret = -EFAULT;
338 goto out;
339 }
340
341 /*
342 * Sum up the vecs, making sure they don't overflow
343 */
344 iov = (struct iovec *) sg_iov;
345 iov_data_len = 0;
346 for (i = 0; i < hdr->iovec_count; i++) {
347 if (iov_data_len + iov[i].iov_len < iov_data_len) {
348 kfree(sg_iov);
349 ret = -EINVAL;
350 goto out;
351 }
352 iov_data_len += iov[i].iov_len;
353 }
354
355 /* SG_IO howto says that the shorter of the two wins */
356 if (hdr->dxfer_len < iov_data_len) {
357 hdr->iovec_count = iov_shorten(iov,
358 hdr->iovec_count,
359 hdr->dxfer_len);
360 iov_data_len = hdr->dxfer_len;
361 }
362
363 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
364 iov_data_len, GFP_KERNEL);
365 kfree(sg_iov);
366 } else if (hdr->dxfer_len)
367 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
368 GFP_KERNEL);
369
370 if (ret)
371 goto out;
372
373 bio = rq->bio;
374 memset(sense, 0, sizeof(sense));
375 rq->sense = sense;
376 rq->sense_len = 0;
377 rq->retries = 0;
378
379 start_time = jiffies;
380
381 /* ignore return value. All information is passed back to caller
382 * (if he doesn't check that is his problem).
383 * N.B. a non-zero SCSI status is _not_ necessarily an error.
384 */
385 blk_execute_rq(q, bd_disk, rq, 0);
386
387 hdr->duration = jiffies_to_msecs(jiffies - start_time);
388
389 return blk_complete_sghdr_rq(rq, hdr, bio);
390out:
391 blk_put_request(rq);
392 return ret;
393}
394
395/**
396 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
397 * @file: file this ioctl operates on (optional)
398 * @q: request queue to send scsi commands down
399 * @disk: gendisk to operate on (option)
400 * @sic: userspace structure describing the command to perform
401 *
402 * Send down the scsi command described by @sic to the device below
403 * the request queue @q. If @file is non-NULL it's used to perform
404 * fine-grained permission checks that allow users to send down
405 * non-destructive SCSI commands. If the caller has a struct gendisk
406 * available it should be passed in as @disk to allow the low level
407 * driver to use the information contained in it. A non-NULL @disk
408 * is only allowed if the caller knows that the low level driver doesn't
409 * need it (e.g. in the scsi subsystem).
410 *
411 * Notes:
412 * - This interface is deprecated - users should use the SG_IO
413 * interface instead, as this is a more flexible approach to
414 * performing SCSI commands on a device.
415 * - The SCSI command length is determined by examining the 1st byte
416 * of the given command. There is no way to override this.
417 * - Data transfers are limited to PAGE_SIZE
418 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
419 * accommodate the sense buffer when an error occurs.
420 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
421 * old code will not be surprised.
422 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
423 * a negative return and the Unix error code in 'errno'.
424 * If the SCSI command succeeds then 0 is returned.
425 * Positive numbers returned are the compacted SCSI error codes (4
426 * bytes in one int) where the lowest byte is the SCSI status.
427 */
428#define OMAX_SB_LEN 16 /* For backward compatibility */
429int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
430 struct scsi_ioctl_command __user *sic)
431{
432 struct request *rq;
433 int err;
434 unsigned int in_len, out_len, bytes, opcode, cmdlen;
435 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
436
437 if (!sic)
438 return -EINVAL;
439
440 /*
441 * get in an out lengths, verify they don't exceed a page worth of data
442 */
443 if (get_user(in_len, &sic->inlen))
444 return -EFAULT;
445 if (get_user(out_len, &sic->outlen))
446 return -EFAULT;
447 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
448 return -EINVAL;
449 if (get_user(opcode, sic->data))
450 return -EFAULT;
451
452 bytes = max(in_len, out_len);
453 if (bytes) {
454 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
455 if (!buffer)
456 return -ENOMEM;
457
458 }
459
460 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
461
462 cmdlen = COMMAND_SIZE(opcode);
463
464 /*
465 * get command and data to send to device, if any
466 */
467 err = -EFAULT;
468 rq->cmd_len = cmdlen;
469 if (copy_from_user(rq->cmd, sic->data, cmdlen))
470 goto error;
471
472 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
473 goto error;
474
475 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
476 if (err)
477 goto error;
478
479 /* default. possible overriden later */
480 rq->retries = 5;
481
482 switch (opcode) {
483 case SEND_DIAGNOSTIC:
484 case FORMAT_UNIT:
485 rq->timeout = FORMAT_UNIT_TIMEOUT;
486 rq->retries = 1;
487 break;
488 case START_STOP:
489 rq->timeout = START_STOP_TIMEOUT;
490 break;
491 case MOVE_MEDIUM:
492 rq->timeout = MOVE_MEDIUM_TIMEOUT;
493 break;
494 case READ_ELEMENT_STATUS:
495 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
496 break;
497 case READ_DEFECT_DATA:
498 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
499 rq->retries = 1;
500 break;
501 default:
502 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
503 break;
504 }
505
506 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
507 err = DRIVER_ERROR << 24;
508 goto out;
509 }
510
511 memset(sense, 0, sizeof(sense));
512 rq->sense = sense;
513 rq->sense_len = 0;
514 rq->cmd_type = REQ_TYPE_BLOCK_PC;
515
516 blk_execute_rq(q, disk, rq, 0);
517
518out:
519 err = rq->errors & 0xff; /* only 8 bit SCSI status */
520 if (err) {
521 if (rq->sense_len && rq->sense) {
522 bytes = (OMAX_SB_LEN > rq->sense_len) ?
523 rq->sense_len : OMAX_SB_LEN;
524 if (copy_to_user(sic->data, rq->sense, bytes))
525 err = -EFAULT;
526 }
527 } else {
528 if (copy_to_user(sic->data, buffer, out_len))
529 err = -EFAULT;
530 }
531
532error:
533 kfree(buffer);
534 blk_put_request(rq);
535 return err;
536}
537EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
538
539/* Send basic block requests */
540static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
541 int cmd, int data)
542{
543 struct request *rq;
544 int err;
545
546 rq = blk_get_request(q, WRITE, __GFP_WAIT);
547 rq->cmd_type = REQ_TYPE_BLOCK_PC;
548 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
549 rq->cmd[0] = cmd;
550 rq->cmd[4] = data;
551 rq->cmd_len = 6;
552 err = blk_execute_rq(q, bd_disk, rq, 0);
553 blk_put_request(rq);
554
555 return err;
556}
557
558static inline int blk_send_start_stop(struct request_queue *q,
559 struct gendisk *bd_disk, int data)
560{
561 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
562}
563
564int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
565 unsigned int cmd, void __user *arg)
566{
567 int err;
568
569 if (!q)
570 return -ENXIO;
571
572 switch (cmd) {
573 /*
574 * new sgv3 interface
575 */
576 case SG_GET_VERSION_NUM:
577 err = sg_get_version(arg);
578 break;
579 case SCSI_IOCTL_GET_IDLUN:
580 err = scsi_get_idlun(q, arg);
581 break;
582 case SCSI_IOCTL_GET_BUS_NUMBER:
583 err = scsi_get_bus(q, arg);
584 break;
585 case SG_SET_TIMEOUT:
586 err = sg_set_timeout(q, arg);
587 break;
588 case SG_GET_TIMEOUT:
589 err = sg_get_timeout(q);
590 break;
591 case SG_GET_RESERVED_SIZE:
592 err = sg_get_reserved_size(q, arg);
593 break;
594 case SG_SET_RESERVED_SIZE:
595 err = sg_set_reserved_size(q, arg);
596 break;
597 case SG_EMULATED_HOST:
598 err = sg_emulated_host(q, arg);
599 break;
600 case SG_IO: {
601 struct sg_io_hdr hdr;
602
603 err = -EFAULT;
604 if (copy_from_user(&hdr, arg, sizeof(hdr)))
605 break;
606 err = sg_io(q, bd_disk, &hdr, mode);
607 if (err == -EFAULT)
608 break;
609
610 if (copy_to_user(arg, &hdr, sizeof(hdr)))
611 err = -EFAULT;
612 break;
613 }
614 case CDROM_SEND_PACKET: {
615 struct cdrom_generic_command cgc;
616 struct sg_io_hdr hdr;
617
618 err = -EFAULT;
619 if (copy_from_user(&cgc, arg, sizeof(cgc)))
620 break;
621 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
622 memset(&hdr, 0, sizeof(hdr));
623 hdr.interface_id = 'S';
624 hdr.cmd_len = sizeof(cgc.cmd);
625 hdr.dxfer_len = cgc.buflen;
626 err = 0;
627 switch (cgc.data_direction) {
628 case CGC_DATA_UNKNOWN:
629 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
630 break;
631 case CGC_DATA_WRITE:
632 hdr.dxfer_direction = SG_DXFER_TO_DEV;
633 break;
634 case CGC_DATA_READ:
635 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
636 break;
637 case CGC_DATA_NONE:
638 hdr.dxfer_direction = SG_DXFER_NONE;
639 break;
640 default:
641 err = -EINVAL;
642 }
643 if (err)
644 break;
645
646 hdr.dxferp = cgc.buffer;
647 hdr.sbp = cgc.sense;
648 if (hdr.sbp)
649 hdr.mx_sb_len = sizeof(struct request_sense);
650 hdr.timeout = jiffies_to_msecs(cgc.timeout);
651 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
652 hdr.cmd_len = sizeof(cgc.cmd);
653
654 err = sg_io(q, bd_disk, &hdr, mode);
655 if (err == -EFAULT)
656 break;
657
658 if (hdr.status)
659 err = -EIO;
660
661 cgc.stat = err;
662 cgc.buflen = hdr.resid;
663 if (copy_to_user(arg, &cgc, sizeof(cgc)))
664 err = -EFAULT;
665
666 break;
667 }
668
669 /*
670 * old junk scsi send command ioctl
671 */
672 case SCSI_IOCTL_SEND_COMMAND:
673 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
674 err = -EINVAL;
675 if (!arg)
676 break;
677
678 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
679 break;
680 case CDROMCLOSETRAY:
681 err = blk_send_start_stop(q, bd_disk, 0x03);
682 break;
683 case CDROMEJECT:
684 err = blk_send_start_stop(q, bd_disk, 0x02);
685 break;
686 default:
687 err = -ENOTTY;
688 }
689
690 return err;
691}
692EXPORT_SYMBOL(scsi_cmd_ioctl);
693
694int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
695{
696 if (bd && bd == bd->bd_contains)
697 return 0;
698
699 /* Actually none of these is particularly useful on a partition,
700 * but they are safe.
701 */
702 switch (cmd) {
703 case SCSI_IOCTL_GET_IDLUN:
704 case SCSI_IOCTL_GET_BUS_NUMBER:
705 case SCSI_IOCTL_GET_PCI:
706 case SCSI_IOCTL_PROBE_HOST:
707 case SG_GET_VERSION_NUM:
708 case SG_SET_TIMEOUT:
709 case SG_GET_TIMEOUT:
710 case SG_GET_RESERVED_SIZE:
711 case SG_SET_RESERVED_SIZE:
712 case SG_EMULATED_HOST:
713 return 0;
714 case CDROM_GET_CAPABILITY:
715 /* Keep this until we remove the printk below. udev sends it
716 * and we do not want to spam dmesg about it. CD-ROMs do
717 * not have partitions, so we get here only for disks.
718 */
719 return -ENOIOCTLCMD;
720 default:
721 break;
722 }
723
724 if (capable(CAP_SYS_RAWIO))
725 return 0;
726
727 /* In particular, rule out all resets and host-specific ioctls. */
728 printk_ratelimited(KERN_WARNING
729 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
730
731 return -ENOIOCTLCMD;
732}
733EXPORT_SYMBOL(scsi_verify_blk_ioctl);
734
735int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
736 unsigned int cmd, void __user *arg)
737{
738 int ret;
739
740 ret = scsi_verify_blk_ioctl(bd, cmd);
741 if (ret < 0)
742 return ret;
743
744 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
745}
746EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
747
748static int __init blk_scsi_ioctl_init(void)
749{
750 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
751 return 0;
752}
753fs_initcall(blk_scsi_ioctl_init);