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1da177e4
LT		 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>
c59ede7b 24#include <linux/capability.h>
1da177e4
LT		 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
35/* Command group 3 is reserved and should never be used. */
36const unsigned char scsi_command_size[8] =
37{
38 6, 10, 10, 12,
39 16, 12, 10, 10
40};
41
42EXPORT_SYMBOL(scsi_command_size);
43
44#define BLK_DEFAULT_TIMEOUT (60 * HZ)
45
46#include <scsi/sg.h>
47
48static int sg_get_version(int __user *p)
49{
64100099 50 static const int sg_version_num = 30527;
1da177e4
LT		 51 return put_user(sg_version_num, p);
52}
53
54static int scsi_get_idlun(request_queue_t *q, int __user *p)
55{
56 return put_user(0, p);
57}
58
59static int scsi_get_bus(request_queue_t *q, int __user *p)
60{
61 return put_user(0, p);
62}
63
64static int sg_get_timeout(request_queue_t *q)
65{
66 return q->sg_timeout / (HZ / USER_HZ);
67}
68
69static int sg_set_timeout(request_queue_t *q, int __user *p)
70{
71 int timeout, err = get_user(timeout, p);
72
73 if (!err)
74 q->sg_timeout = timeout * (HZ / USER_HZ);
75
76 return err;
77}
78
79static int sg_get_reserved_size(request_queue_t *q, int __user *p)
80{
81 return put_user(q->sg_reserved_size, p);
82}
83
84static int sg_set_reserved_size(request_queue_t *q, int __user *p)
85{
86 int size, err = get_user(size, p);
87
88 if (err)
89 return err;
90
91 if (size < 0)
92 return -EINVAL;
93 if (size > (q->max_sectors << 9))
94 size = q->max_sectors << 9;
95
96 q->sg_reserved_size = size;
97 return 0;
98}
99
100/*
101 * will always return that we are ATAPI even for a real SCSI drive, I'm not
102 * so sure this is worth doing anything about (why would you care??)
103 */
104static int sg_emulated_host(request_queue_t *q, int __user *p)
105{
106 return put_user(1, p);
107}
108
109#define CMD_READ_SAFE 0x01
110#define CMD_WRITE_SAFE 0x02
111#define CMD_WARNED 0x04
112#define safe_for_read(cmd) [cmd] = CMD_READ_SAFE
113#define safe_for_write(cmd) [cmd] = CMD_WRITE_SAFE
114
115static int verify_command(struct file *file, unsigned char *cmd)
116{
117 static unsigned char cmd_type[256] = {
118
119 /* Basic read-only commands */
120 safe_for_read(TEST_UNIT_READY),
121 safe_for_read(REQUEST_SENSE),
122 safe_for_read(READ_6),
123 safe_for_read(READ_10),
124 safe_for_read(READ_12),
125 safe_for_read(READ_16),
126 safe_for_read(READ_BUFFER),
942fc2fb 127 safe_for_read(READ_DEFECT_DATA),
1da177e4
LT		 128 safe_for_read(READ_LONG),
129 safe_for_read(INQUIRY),
130 safe_for_read(MODE_SENSE),
131 safe_for_read(MODE_SENSE_10),
132 safe_for_read(LOG_SENSE),
133 safe_for_read(START_STOP),
134 safe_for_read(GPCMD_VERIFY_10),
135 safe_for_read(VERIFY_16),
136
137 /* Audio CD commands */
138 safe_for_read(GPCMD_PLAY_CD),
139 safe_for_read(GPCMD_PLAY_AUDIO_10),
140 safe_for_read(GPCMD_PLAY_AUDIO_MSF),
141 safe_for_read(GPCMD_PLAY_AUDIO_TI),
142 safe_for_read(GPCMD_PAUSE_RESUME),
143
144 /* CD/DVD data reading */
145 safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
146 safe_for_read(GPCMD_READ_CD),
147 safe_for_read(GPCMD_READ_CD_MSF),
148 safe_for_read(GPCMD_READ_DISC_INFO),
149 safe_for_read(GPCMD_READ_CDVD_CAPACITY),
150 safe_for_read(GPCMD_READ_DVD_STRUCTURE),
151 safe_for_read(GPCMD_READ_HEADER),
152 safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
153 safe_for_read(GPCMD_READ_SUBCHANNEL),
154 safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
155 safe_for_read(GPCMD_REPORT_KEY),
156 safe_for_read(GPCMD_SCAN),
157 safe_for_read(GPCMD_GET_CONFIGURATION),
158 safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
159 safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
160 safe_for_read(GPCMD_GET_PERFORMANCE),
161 safe_for_read(GPCMD_SEEK),
162 safe_for_read(GPCMD_STOP_PLAY_SCAN),
163
164 /* Basic writing commands */
165 safe_for_write(WRITE_6),
166 safe_for_write(WRITE_10),
167 safe_for_write(WRITE_VERIFY),
168 safe_for_write(WRITE_12),
169 safe_for_write(WRITE_VERIFY_12),
170 safe_for_write(WRITE_16),
171 safe_for_write(WRITE_LONG),
0faf3d3d 172 safe_for_write(WRITE_LONG_2),
1da177e4
LT		 173 safe_for_write(ERASE),
174 safe_for_write(GPCMD_MODE_SELECT_10),
175 safe_for_write(MODE_SELECT),
176 safe_for_write(LOG_SELECT),
177 safe_for_write(GPCMD_BLANK),
178 safe_for_write(GPCMD_CLOSE_TRACK),
179 safe_for_write(GPCMD_FLUSH_CACHE),
180 safe_for_write(GPCMD_FORMAT_UNIT),
181 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
182 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
183 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
184 safe_for_write(GPCMD_SEND_EVENT),
185 safe_for_write(GPCMD_SEND_KEY),
186 safe_for_write(GPCMD_SEND_OPC),
187 safe_for_write(GPCMD_SEND_CUE_SHEET),
188 safe_for_write(GPCMD_SET_SPEED),
189 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
190 safe_for_write(GPCMD_LOAD_UNLOAD),
191 safe_for_write(GPCMD_SET_STREAMING),
192 };
193 unsigned char type = cmd_type[cmd[0]];
5a57be8d 194 int has_write_perm = 0;
1da177e4
LT		 195
196 /* Anybody who can open the device can do a read-safe command */
197 if (type & CMD_READ_SAFE)
198 return 0;
199
5a57be8d
JA		 200 /*
201 * file can be NULL from ioctl_by_bdev()...
202 */
203 if (file)
204 has_write_perm = file->f_mode & FMODE_WRITE;
205
1da177e4 206 /* Write-safe commands just require a writable open.. */
5a57be8d
JA		 207 if ((type & CMD_WRITE_SAFE) && has_write_perm)
208 return 0;
1da177e4 209
3b0e77bd
JA		 210 /* And root can do any command.. */
211 if (capable(CAP_SYS_RAWIO))
212 return 0;
213
1da177e4
LT		 214 if (!type) {
215 cmd_type[cmd[0]] = CMD_WARNED;
216 printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
217 }
218
1da177e4
LT		 219 /* Otherwise fail it with an "Operation not permitted" */
220 return -EPERM;
221}
222
223static int sg_io(struct file *file, request_queue_t *q,
224 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
225{
226 unsigned long start_time;
f63eb21b 227 int writing = 0, ret = 0;
1da177e4
LT		 228 struct request *rq;
229 struct bio *bio;
230 char sense[SCSI_SENSE_BUFFERSIZE];
231 unsigned char cmd[BLK_MAX_CDB];
232
233 if (hdr->interface_id != 'S')
234 return -EINVAL;
235 if (hdr->cmd_len > BLK_MAX_CDB)
236 return -EINVAL;
237 if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
238 return -EFAULT;
239 if (verify_command(file, cmd))
240 return -EPERM;
241
defd94b7 242 if (hdr->dxfer_len > (q->max_hw_sectors << 9))
1da177e4
LT		 243 return -EIO;
244
f1970baf 245 if (hdr->dxfer_len)
1da177e4
LT		 246 switch (hdr->dxfer_direction) {
247 default:
248 return -EINVAL;
249 case SG_DXFER_TO_FROM_DEV:
1da177e4
LT		 250 case SG_DXFER_TO_DEV:
251 writing = 1;
252 break;
253 case SG_DXFER_FROM_DEV:
1da177e4
LT		 254 break;
255 }
256
dd1cab95
JA		 257 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
258 if (!rq)
259 return -ENOMEM;
1da177e4 260
f1970baf
JB		 261 if (hdr->iovec_count) {
262 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
263 struct sg_iovec *iov;
264
265 iov = kmalloc(size, GFP_KERNEL);
266 if (!iov) {
267 ret = -ENOMEM;
dd1cab95 268 goto out;
f1970baf
JB		 269 }
270
271 if (copy_from_user(iov, hdr->dxferp, size)) {
272 kfree(iov);
273 ret = -EFAULT;
274 goto out;
275 }
276
277 ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count);
278 kfree(iov);
279 } else if (hdr->dxfer_len)
280 ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
281
282 if (ret)
283 goto out;
1da177e4
LT		 284
285 /*
286 * fill in request structure
287 */
288 rq->cmd_len = hdr->cmd_len;
289 memcpy(rq->cmd, cmd, hdr->cmd_len);
290 if (sizeof(rq->cmd) != hdr->cmd_len)
291 memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
292
293 memset(sense, 0, sizeof(sense));
294 rq->sense = sense;
295 rq->sense_len = 0;
296
297 rq->flags |= REQ_BLOCK_PC;
298 bio = rq->bio;
299
300 /*
301 * bounce this after holding a reference to the original bio, it's
302 * needed for proper unmapping
303 */
304 if (rq->bio)
305 blk_queue_bounce(q, &rq->bio);
306
307 rq->timeout = (hdr->timeout * HZ) / 1000;
308 if (!rq->timeout)
309 rq->timeout = q->sg_timeout;
310 if (!rq->timeout)
311 rq->timeout = BLK_DEFAULT_TIMEOUT;
312
01840f9c
JA		 313 rq->retries = 0;
314
1da177e4
LT		 315 start_time = jiffies;
316
317 /* ignore return value. All information is passed back to caller
318 * (if he doesn't check that is his problem).
319 * N.B. a non-zero SCSI status is _not_ necessarily an error.
320 */
994ca9a1 321 blk_execute_rq(q, bd_disk, rq, 0);
1da177e4
LT		 322
323 /* write to all output members */
324 hdr->status = 0xff & rq->errors;
325 hdr->masked_status = status_byte(rq->errors);
326 hdr->msg_status = msg_byte(rq->errors);
327 hdr->host_status = host_byte(rq->errors);
328 hdr->driver_status = driver_byte(rq->errors);
329 hdr->info = 0;
330 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
331 hdr->info |= SG_INFO_CHECK;
332 hdr->resid = rq->data_len;
333 hdr->duration = ((jiffies - start_time) * 1000) / HZ;
334 hdr->sb_len_wr = 0;
335
336 if (rq->sense_len && hdr->sbp) {
337 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
338
339 if (!copy_to_user(hdr->sbp, rq->sense, len))
340 hdr->sb_len_wr = len;
341 }
342
e1f546e1 343 if (blk_rq_unmap_user(bio, hdr->dxfer_len))
dd1cab95 344 ret = -EFAULT;
1da177e4
LT		 345
346 /* may not have succeeded, but output values written to control
347 * structure (struct sg_io_hdr). */
dd1cab95
JA		 348out:
349 blk_put_request(rq);
350 return ret;
1da177e4
LT		 351}
352
1da177e4
LT		 353#define OMAX_SB_LEN 16 /* For backward compatibility */
354
355static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
356 struct gendisk *bd_disk, Scsi_Ioctl_Command __user *sic)
357{
358 struct request *rq;
359 int err;
360 unsigned int in_len, out_len, bytes, opcode, cmdlen;
361 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
362
363 /*
364 * get in an out lengths, verify they don't exceed a page worth of data
365 */
366 if (get_user(in_len, &sic->inlen))
367 return -EFAULT;
368 if (get_user(out_len, &sic->outlen))
369 return -EFAULT;
370 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
371 return -EINVAL;
372 if (get_user(opcode, sic->data))
373 return -EFAULT;
374
375 bytes = max(in_len, out_len);
376 if (bytes) {
377 buffer = kmalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
378 if (!buffer)
379 return -ENOMEM;
380
381 memset(buffer, 0, bytes);
382 }
383
384 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
385
386 cmdlen = COMMAND_SIZE(opcode);
387
388 /*
389 * get command and data to send to device, if any
390 */
391 err = -EFAULT;
392 rq->cmd_len = cmdlen;
393 if (copy_from_user(rq->cmd, sic->data, cmdlen))
394 goto error;
395
396 if (copy_from_user(buffer, sic->data + cmdlen, in_len))
397 goto error;
398
399 err = verify_command(file, rq->cmd);
400 if (err)
401 goto error;
402
403 switch (opcode) {
404 case SEND_DIAGNOSTIC:
405 case FORMAT_UNIT:
406 rq->timeout = FORMAT_UNIT_TIMEOUT;
407 break;
408 case START_STOP:
409 rq->timeout = START_STOP_TIMEOUT;
410 break;
411 case MOVE_MEDIUM:
412 rq->timeout = MOVE_MEDIUM_TIMEOUT;
413 break;
414 case READ_ELEMENT_STATUS:
415 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
416 break;
417 case READ_DEFECT_DATA:
418 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
419 break;
420 default:
421 rq->timeout = BLK_DEFAULT_TIMEOUT;
422 break;
423 }
424
425 memset(sense, 0, sizeof(sense));
426 rq->sense = sense;
427 rq->sense_len = 0;
428
429 rq->data = buffer;
430 rq->data_len = bytes;
431 rq->flags |= REQ_BLOCK_PC;
01840f9c 432 rq->retries = 0;
1da177e4 433
994ca9a1 434 blk_execute_rq(q, bd_disk, rq, 0);
1da177e4
LT		 435 err = rq->errors & 0xff; /* only 8 bit SCSI status */
436 if (err) {
437 if (rq->sense_len && rq->sense) {
438 bytes = (OMAX_SB_LEN > rq->sense_len) ?
439 rq->sense_len : OMAX_SB_LEN;
440 if (copy_to_user(sic->data, rq->sense, bytes))
441 err = -EFAULT;
442 }
443 } else {
444 if (copy_to_user(sic->data, buffer, out_len))
445 err = -EFAULT;
446 }
447
448error:
449 kfree(buffer);
450 blk_put_request(rq);
451 return err;
452}
453
f98d2dfd
BC		 454
455/* Send basic block requests */
456static int __blk_send_generic(request_queue_t *q, struct gendisk *bd_disk, int cmd, int data)
457{
458 struct request *rq;
459 int err;
460
461 rq = blk_get_request(q, WRITE, __GFP_WAIT);
462 rq->flags |= REQ_BLOCK_PC;
463 rq->data = NULL;
464 rq->data_len = 0;
465 rq->timeout = BLK_DEFAULT_TIMEOUT;
466 memset(rq->cmd, 0, sizeof(rq->cmd));
467 rq->cmd[0] = cmd;
468 rq->cmd[4] = data;
469 rq->cmd_len = 6;
470 err = blk_execute_rq(q, bd_disk, rq, 0);
471 blk_put_request(rq);
472
473 return err;
474}
475
476static inline int blk_send_start_stop(request_queue_t *q, struct gendisk *bd_disk, int data)
477{
478 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
479}
480
1da177e4
LT		 481int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
482{
483 request_queue_t *q;
f98d2dfd 484 int err;
1da177e4
LT		 485
486 q = bd_disk->queue;
487 if (!q)
488 return -ENXIO;
489
490 if (blk_get_queue(q))
491 return -ENXIO;
492
493 switch (cmd) {
494 /*
495 * new sgv3 interface
496 */
497 case SG_GET_VERSION_NUM:
498 err = sg_get_version(arg);
499 break;
500 case SCSI_IOCTL_GET_IDLUN:
501 err = scsi_get_idlun(q, arg);
502 break;
503 case SCSI_IOCTL_GET_BUS_NUMBER:
504 err = scsi_get_bus(q, arg);
505 break;
506 case SG_SET_TIMEOUT:
507 err = sg_set_timeout(q, arg);
508 break;
509 case SG_GET_TIMEOUT:
510 err = sg_get_timeout(q);
511 break;
512 case SG_GET_RESERVED_SIZE:
513 err = sg_get_reserved_size(q, arg);
514 break;
515 case SG_SET_RESERVED_SIZE:
516 err = sg_set_reserved_size(q, arg);
517 break;
518 case SG_EMULATED_HOST:
519 err = sg_emulated_host(q, arg);
520 break;
521 case SG_IO: {
522 struct sg_io_hdr hdr;
523
524 err = -EFAULT;
525 if (copy_from_user(&hdr, arg, sizeof(hdr)))
526 break;
527 err = sg_io(file, q, bd_disk, &hdr);
528 if (err == -EFAULT)
529 break;
530
531 if (copy_to_user(arg, &hdr, sizeof(hdr)))
532 err = -EFAULT;
533 break;
534 }
535 case CDROM_SEND_PACKET: {
536 struct cdrom_generic_command cgc;
537 struct sg_io_hdr hdr;
538
539 err = -EFAULT;
540 if (copy_from_user(&cgc, arg, sizeof(cgc)))
541 break;
542 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
543 memset(&hdr, 0, sizeof(hdr));
544 hdr.interface_id = 'S';
545 hdr.cmd_len = sizeof(cgc.cmd);
546 hdr.dxfer_len = cgc.buflen;
547 err = 0;
548 switch (cgc.data_direction) {
549 case CGC_DATA_UNKNOWN:
550 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
551 break;
552 case CGC_DATA_WRITE:
553 hdr.dxfer_direction = SG_DXFER_TO_DEV;
554 break;
555 case CGC_DATA_READ:
556 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
557 break;
558 case CGC_DATA_NONE:
559 hdr.dxfer_direction = SG_DXFER_NONE;
560 break;
561 default:
562 err = -EINVAL;
563 }
564 if (err)
565 break;
566
567 hdr.dxferp = cgc.buffer;
568 hdr.sbp = cgc.sense;
569 if (hdr.sbp)
570 hdr.mx_sb_len = sizeof(struct request_sense);
571 hdr.timeout = cgc.timeout;
572 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
573 hdr.cmd_len = sizeof(cgc.cmd);
574
575 err = sg_io(file, q, bd_disk, &hdr);
576 if (err == -EFAULT)
577 break;
578
579 if (hdr.status)
580 err = -EIO;
581
582 cgc.stat = err;
583 cgc.buflen = hdr.resid;
584 if (copy_to_user(arg, &cgc, sizeof(cgc)))
585 err = -EFAULT;
586
587 break;
588 }
589
590 /*
591 * old junk scsi send command ioctl
592 */
593 case SCSI_IOCTL_SEND_COMMAND:
594 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
595 err = -EINVAL;
596 if (!arg)
597 break;
598
599 err = sg_scsi_ioctl(file, q, bd_disk, arg);
600 break;
601 case CDROMCLOSETRAY:
f98d2dfd
BC		 602 err = blk_send_start_stop(q, bd_disk, 0x03);
603 break;
1da177e4 604 case CDROMEJECT:
f98d2dfd 605 err = blk_send_start_stop(q, bd_disk, 0x02);
1da177e4
LT		 606 break;
607 default:
608 err = -ENOTTY;
609 }
610
611 blk_put_queue(q);
612 return err;
613}
614
615EXPORT_SYMBOL(scsi_cmd_ioctl);
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