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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / block / scsi_ioctl.c
blob260fa80ef5750f80f4ebc1415d06abc992e18b8a
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
36 struct 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
41 static struct blk_cmd_filter blk_default_cmd_filter;
42
43 /* Command group 3 is reserved and should never be used. */
44 const unsigned char scsi_command_size_tbl[8] =
45 {
46 6, 10, 10, 12,
47 16, 12, 10, 10
48 };
49 EXPORT_SYMBOL(scsi_command_size_tbl);
50
51 #include <scsi/sg.h>
52
53 static 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
59 static int scsi_get_idlun(struct request_queue *q, int __user *p)
60 {
61 return put_user(0, p);
62 }
63
64 static int scsi_get_bus(struct request_queue *q, int __user *p)
65 {
66 return put_user(0, p);
67 }
68
69 static int sg_get_timeout(struct request_queue *q)
70 {
71 return jiffies_to_clock_t(q->sg_timeout);
72 }
73
74 static 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
84 static 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
91 static 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 */
111 static int sg_emulated_host(struct request_queue *q, int __user *p)
112 {
113 return put_user(1, p);
114 }
115
116 static 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
199 int 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 }
221 EXPORT_SYMBOL(blk_verify_command);
222
223 static 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
248 static 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
284 static 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);
390 out:
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 */
429 int 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
518 out:
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
532 error:
533 kfree(buffer);
534 blk_put_request(rq);
535 return err;
536 }
537 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
538
539 /* Send basic block requests */
540 static 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
558 static 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
564 int 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 }
692 EXPORT_SYMBOL(scsi_cmd_ioctl);
693
694 int 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 /* In particular, rule out all resets and host-specific ioctls. */
725 printk_ratelimited(KERN_WARNING
726 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
727
728 return capable(CAP_SYS_RAWIO) ? 0 : -ENOIOCTLCMD;
729 }
730 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
731
732 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
733 unsigned int cmd, void __user *arg)
734 {
735 int ret;
736
737 ret = scsi_verify_blk_ioctl(bd, cmd);
738 if (ret < 0)
739 return ret;
740
741 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
742 }
743 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
744
745 static int __init blk_scsi_ioctl_init(void)
746 {
747 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
748 return 0;
749 }
750 fs_initcall(blk_scsi_ioctl_init);