tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/completion.h>
25#include <linux/cdrom.h>
26#include <linux/slab.h>
27#include <linux/times.h>
28#include <asm/uaccess.h>
29
30#include <scsi/scsi.h>
31#include <scsi/scsi_ioctl.h>
32#include <scsi/scsi_cmnd.h>
33
34/* Command group 3 is reserved and should never be used. */
35const unsigned char scsi_command_size[8] =
36{
37 6, 10, 10, 12,
38 16, 12, 10, 10
39};
40
41EXPORT_SYMBOL(scsi_command_size);
42
43#define BLK_DEFAULT_TIMEOUT (60 * HZ)
44
45#include <scsi/sg.h>
46
47static int sg_get_version(int __user *p)
48{
49 static int sg_version_num = 30527;
50 return put_user(sg_version_num, p);
51}
52
53static int scsi_get_idlun(request_queue_t *q, int __user *p)
54{
55 return put_user(0, p);
56}
57
58static int scsi_get_bus(request_queue_t *q, int __user *p)
59{
60 return put_user(0, p);
61}
62
63static int sg_get_timeout(request_queue_t *q)
64{
65 return q->sg_timeout / (HZ / USER_HZ);
66}
67
68static int sg_set_timeout(request_queue_t *q, int __user *p)
69{
70 int timeout, err = get_user(timeout, p);
71
72 if (!err)
73 q->sg_timeout = timeout * (HZ / USER_HZ);
74
75 return err;
76}
77
78static int sg_get_reserved_size(request_queue_t *q, int __user *p)
79{
80 return put_user(q->sg_reserved_size, p);
81}
82
83static int sg_set_reserved_size(request_queue_t *q, int __user *p)
84{
85 int size, err = get_user(size, p);
86
87 if (err)
88 return err;
89
90 if (size < 0)
91 return -EINVAL;
92 if (size > (q->max_sectors << 9))
93 size = q->max_sectors << 9;
94
95 q->sg_reserved_size = size;
96 return 0;
97}
98
99/*
100 * will always return that we are ATAPI even for a real SCSI drive, I'm not
101 * so sure this is worth doing anything about (why would you care??)
102 */
103static int sg_emulated_host(request_queue_t *q, int __user *p)
104{
105 return put_user(1, p);
106}
107
108#define CMD_READ_SAFE 0x01
109#define CMD_WRITE_SAFE 0x02
110#define CMD_WARNED 0x04
111#define safe_for_read(cmd) [cmd] = CMD_READ_SAFE
112#define safe_for_write(cmd) [cmd] = CMD_WRITE_SAFE
113
114static int verify_command(struct file *file, unsigned char *cmd)
115{
116 static unsigned char cmd_type[256] = {
117
118 /* Basic read-only commands */
119 safe_for_read(TEST_UNIT_READY),
120 safe_for_read(REQUEST_SENSE),
121 safe_for_read(READ_6),
122 safe_for_read(READ_10),
123 safe_for_read(READ_12),
124 safe_for_read(READ_16),
125 safe_for_read(READ_BUFFER),
126 safe_for_read(READ_DEFECT_DATA),
127 safe_for_read(READ_LONG),
128 safe_for_read(INQUIRY),
129 safe_for_read(MODE_SENSE),
130 safe_for_read(MODE_SENSE_10),
131 safe_for_read(LOG_SENSE),
132 safe_for_read(START_STOP),
133 safe_for_read(GPCMD_VERIFY_10),
134 safe_for_read(VERIFY_16),
135
136 /* Audio CD commands */
137 safe_for_read(GPCMD_PLAY_CD),
138 safe_for_read(GPCMD_PLAY_AUDIO_10),
139 safe_for_read(GPCMD_PLAY_AUDIO_MSF),
140 safe_for_read(GPCMD_PLAY_AUDIO_TI),
141 safe_for_read(GPCMD_PAUSE_RESUME),
142
143 /* CD/DVD data reading */
144 safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
145 safe_for_read(GPCMD_READ_CD),
146 safe_for_read(GPCMD_READ_CD_MSF),
147 safe_for_read(GPCMD_READ_DISC_INFO),
148 safe_for_read(GPCMD_READ_CDVD_CAPACITY),
149 safe_for_read(GPCMD_READ_DVD_STRUCTURE),
150 safe_for_read(GPCMD_READ_HEADER),
151 safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
152 safe_for_read(GPCMD_READ_SUBCHANNEL),
153 safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
154 safe_for_read(GPCMD_REPORT_KEY),
155 safe_for_read(GPCMD_SCAN),
156 safe_for_read(GPCMD_GET_CONFIGURATION),
157 safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
158 safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
159 safe_for_read(GPCMD_GET_PERFORMANCE),
160 safe_for_read(GPCMD_SEEK),
161 safe_for_read(GPCMD_STOP_PLAY_SCAN),
162
163 /* Basic writing commands */
164 safe_for_write(WRITE_6),
165 safe_for_write(WRITE_10),
166 safe_for_write(WRITE_VERIFY),
167 safe_for_write(WRITE_12),
168 safe_for_write(WRITE_VERIFY_12),
169 safe_for_write(WRITE_16),
170 safe_for_write(WRITE_LONG),
171 safe_for_write(WRITE_LONG_2),
172 safe_for_write(ERASE),
173 safe_for_write(GPCMD_MODE_SELECT_10),
174 safe_for_write(MODE_SELECT),
175 safe_for_write(LOG_SELECT),
176 safe_for_write(GPCMD_BLANK),
177 safe_for_write(GPCMD_CLOSE_TRACK),
178 safe_for_write(GPCMD_FLUSH_CACHE),
179 safe_for_write(GPCMD_FORMAT_UNIT),
180 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
181 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
182 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
183 safe_for_write(GPCMD_SEND_EVENT),
184 safe_for_write(GPCMD_SEND_KEY),
185 safe_for_write(GPCMD_SEND_OPC),
186 safe_for_write(GPCMD_SEND_CUE_SHEET),
187 safe_for_write(GPCMD_SET_SPEED),
188 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
189 safe_for_write(GPCMD_LOAD_UNLOAD),
190 safe_for_write(GPCMD_SET_STREAMING),
191 };
192 unsigned char type = cmd_type[cmd[0]];
193
194 /* Anybody who can open the device can do a read-safe command */
195 if (type & CMD_READ_SAFE)
196 return 0;
197
198 /* Write-safe commands just require a writable open.. */
199 if (type & CMD_WRITE_SAFE) {
200 if (file->f_mode & FMODE_WRITE)
201 return 0;
202 }
203
204 /* And root can do any command.. */
205 if (capable(CAP_SYS_RAWIO))
206 return 0;
207
208 if (!type) {
209 cmd_type[cmd[0]] = CMD_WARNED;
210 printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
211 }
212
213 /* Otherwise fail it with an "Operation not permitted" */
214 return -EPERM;
215}
216
217static int sg_io(struct file *file, request_queue_t *q,
218 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
219{
220 unsigned long start_time;
221 int writing = 0, ret = 0;
222 struct request *rq;
223 struct bio *bio;
224 char sense[SCSI_SENSE_BUFFERSIZE];
225 unsigned char cmd[BLK_MAX_CDB];
226
227 if (hdr->interface_id != 'S')
228 return -EINVAL;
229 if (hdr->cmd_len > BLK_MAX_CDB)
230 return -EINVAL;
231 if (copy_from_user(cmd, hdr->cmdp, hdr->cmd_len))
232 return -EFAULT;
233 if (verify_command(file, cmd))
234 return -EPERM;
235
236 if (hdr->dxfer_len > (q->max_sectors << 9))
237 return -EIO;
238
239 if (hdr->dxfer_len)
240 switch (hdr->dxfer_direction) {
241 default:
242 return -EINVAL;
243 case SG_DXFER_TO_FROM_DEV:
244 case SG_DXFER_TO_DEV:
245 writing = 1;
246 break;
247 case SG_DXFER_FROM_DEV:
248 break;
249 }
250
251 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
252 if (!rq)
253 return -ENOMEM;
254
255 if (hdr->iovec_count) {
256 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
257 struct sg_iovec *iov;
258
259 iov = kmalloc(size, GFP_KERNEL);
260 if (!iov) {
261 ret = -ENOMEM;
262 goto out;
263 }
264
265 if (copy_from_user(iov, hdr->dxferp, size)) {
266 kfree(iov);
267 ret = -EFAULT;
268 goto out;
269 }
270
271 ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count);
272 kfree(iov);
273 } else if (hdr->dxfer_len)
274 ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
275
276 if (ret)
277 goto out;
278
279 /*
280 * fill in request structure
281 */
282 rq->cmd_len = hdr->cmd_len;
283 memcpy(rq->cmd, cmd, hdr->cmd_len);
284 if (sizeof(rq->cmd) != hdr->cmd_len)
285 memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
286
287 memset(sense, 0, sizeof(sense));
288 rq->sense = sense;
289 rq->sense_len = 0;
290
291 rq->flags |= REQ_BLOCK_PC;
292 bio = rq->bio;
293
294 /*
295 * bounce this after holding a reference to the original bio, it's
296 * needed for proper unmapping
297 */
298 if (rq->bio)
299 blk_queue_bounce(q, &rq->bio);
300
301 rq->timeout = (hdr->timeout * HZ) / 1000;
302 if (!rq->timeout)
303 rq->timeout = q->sg_timeout;
304 if (!rq->timeout)
305 rq->timeout = BLK_DEFAULT_TIMEOUT;
306
307 start_time = jiffies;
308
309 /* ignore return value. All information is passed back to caller
310 * (if he doesn't check that is his problem).
311 * N.B. a non-zero SCSI status is _not_ necessarily an error.
312 */
313 blk_execute_rq(q, bd_disk, rq, 0);
314
315 /* write to all output members */
316 hdr->status = 0xff & rq->errors;
317 hdr->masked_status = status_byte(rq->errors);
318 hdr->msg_status = msg_byte(rq->errors);
319 hdr->host_status = host_byte(rq->errors);
320 hdr->driver_status = driver_byte(rq->errors);
321 hdr->info = 0;
322 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
323 hdr->info |= SG_INFO_CHECK;
324 hdr->resid = rq->data_len;
325 hdr->duration = ((jiffies - start_time) * 1000) / HZ;
326 hdr->sb_len_wr = 0;
327
328 if (rq->sense_len && hdr->sbp) {
329 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
330
331 if (!copy_to_user(hdr->sbp, rq->sense, len))
332 hdr->sb_len_wr = len;
333 }
334
335 if (blk_rq_unmap_user(bio, hdr->dxfer_len))
336 ret = -EFAULT;
337
338 /* may not have succeeded, but output values written to control
339 * structure (struct sg_io_hdr). */
340out:
341 blk_put_request(rq);
342 return ret;
343}
344
345#define OMAX_SB_LEN 16 /* For backward compatibility */
346
347static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
348 struct gendisk *bd_disk, Scsi_Ioctl_Command __user *sic)
349{
350 struct request *rq;
351 int err;
352 unsigned int in_len, out_len, bytes, opcode, cmdlen;
353 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
354
355 /*
356 * get in an out lengths, verify they don't exceed a page worth of data
357 */
358 if (get_user(in_len, &sic->inlen))
359 return -EFAULT;
360 if (get_user(out_len, &sic->outlen))
361 return -EFAULT;
362 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
363 return -EINVAL;
364 if (get_user(opcode, sic->data))
365 return -EFAULT;
366
367 bytes = max(in_len, out_len);
368 if (bytes) {
369 buffer = kmalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
370 if (!buffer)
371 return -ENOMEM;
372
373 memset(buffer, 0, bytes);
374 }
375
376 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
377
378 cmdlen = COMMAND_SIZE(opcode);
379
380 /*
381 * get command and data to send to device, if any
382 */
383 err = -EFAULT;
384 rq->cmd_len = cmdlen;
385 if (copy_from_user(rq->cmd, sic->data, cmdlen))
386 goto error;
387
388 if (copy_from_user(buffer, sic->data + cmdlen, in_len))
389 goto error;
390
391 err = verify_command(file, rq->cmd);
392 if (err)
393 goto error;
394
395 switch (opcode) {
396 case SEND_DIAGNOSTIC:
397 case FORMAT_UNIT:
398 rq->timeout = FORMAT_UNIT_TIMEOUT;
399 break;
400 case START_STOP:
401 rq->timeout = START_STOP_TIMEOUT;
402 break;
403 case MOVE_MEDIUM:
404 rq->timeout = MOVE_MEDIUM_TIMEOUT;
405 break;
406 case READ_ELEMENT_STATUS:
407 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
408 break;
409 case READ_DEFECT_DATA:
410 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
411 break;
412 default:
413 rq->timeout = BLK_DEFAULT_TIMEOUT;
414 break;
415 }
416
417 memset(sense, 0, sizeof(sense));
418 rq->sense = sense;
419 rq->sense_len = 0;
420
421 rq->data = buffer;
422 rq->data_len = bytes;
423 rq->flags |= REQ_BLOCK_PC;
424
425 blk_execute_rq(q, bd_disk, rq, 0);
426 err = rq->errors & 0xff; /* only 8 bit SCSI status */
427 if (err) {
428 if (rq->sense_len && rq->sense) {
429 bytes = (OMAX_SB_LEN > rq->sense_len) ?
430 rq->sense_len : OMAX_SB_LEN;
431 if (copy_to_user(sic->data, rq->sense, bytes))
432 err = -EFAULT;
433 }
434 } else {
435 if (copy_to_user(sic->data, buffer, out_len))
436 err = -EFAULT;
437 }
438
439error:
440 kfree(buffer);
441 blk_put_request(rq);
442 return err;
443}
444
445int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
446{
447 request_queue_t *q;
448 struct request *rq;
449 int close = 0, err;
450
451 q = bd_disk->queue;
452 if (!q)
453 return -ENXIO;
454
455 if (blk_get_queue(q))
456 return -ENXIO;
457
458 switch (cmd) {
459 /*
460 * new sgv3 interface
461 */
462 case SG_GET_VERSION_NUM:
463 err = sg_get_version(arg);
464 break;
465 case SCSI_IOCTL_GET_IDLUN:
466 err = scsi_get_idlun(q, arg);
467 break;
468 case SCSI_IOCTL_GET_BUS_NUMBER:
469 err = scsi_get_bus(q, arg);
470 break;
471 case SG_SET_TIMEOUT:
472 err = sg_set_timeout(q, arg);
473 break;
474 case SG_GET_TIMEOUT:
475 err = sg_get_timeout(q);
476 break;
477 case SG_GET_RESERVED_SIZE:
478 err = sg_get_reserved_size(q, arg);
479 break;
480 case SG_SET_RESERVED_SIZE:
481 err = sg_set_reserved_size(q, arg);
482 break;
483 case SG_EMULATED_HOST:
484 err = sg_emulated_host(q, arg);
485 break;
486 case SG_IO: {
487 struct sg_io_hdr hdr;
488
489 err = -EFAULT;
490 if (copy_from_user(&hdr, arg, sizeof(hdr)))
491 break;
492 err = sg_io(file, q, bd_disk, &hdr);
493 if (err == -EFAULT)
494 break;
495
496 if (copy_to_user(arg, &hdr, sizeof(hdr)))
497 err = -EFAULT;
498 break;
499 }
500 case CDROM_SEND_PACKET: {
501 struct cdrom_generic_command cgc;
502 struct sg_io_hdr hdr;
503
504 err = -EFAULT;
505 if (copy_from_user(&cgc, arg, sizeof(cgc)))
506 break;
507 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
508 memset(&hdr, 0, sizeof(hdr));
509 hdr.interface_id = 'S';
510 hdr.cmd_len = sizeof(cgc.cmd);
511 hdr.dxfer_len = cgc.buflen;
512 err = 0;
513 switch (cgc.data_direction) {
514 case CGC_DATA_UNKNOWN:
515 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
516 break;
517 case CGC_DATA_WRITE:
518 hdr.dxfer_direction = SG_DXFER_TO_DEV;
519 break;
520 case CGC_DATA_READ:
521 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
522 break;
523 case CGC_DATA_NONE:
524 hdr.dxfer_direction = SG_DXFER_NONE;
525 break;
526 default:
527 err = -EINVAL;
528 }
529 if (err)
530 break;
531
532 hdr.dxferp = cgc.buffer;
533 hdr.sbp = cgc.sense;
534 if (hdr.sbp)
535 hdr.mx_sb_len = sizeof(struct request_sense);
536 hdr.timeout = cgc.timeout;
537 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
538 hdr.cmd_len = sizeof(cgc.cmd);
539
540 err = sg_io(file, q, bd_disk, &hdr);
541 if (err == -EFAULT)
542 break;
543
544 if (hdr.status)
545 err = -EIO;
546
547 cgc.stat = err;
548 cgc.buflen = hdr.resid;
549 if (copy_to_user(arg, &cgc, sizeof(cgc)))
550 err = -EFAULT;
551
552 break;
553 }
554
555 /*
556 * old junk scsi send command ioctl
557 */
558 case SCSI_IOCTL_SEND_COMMAND:
559 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
560 err = -EINVAL;
561 if (!arg)
562 break;
563
564 err = sg_scsi_ioctl(file, q, bd_disk, arg);
565 break;
566 case CDROMCLOSETRAY:
567 close = 1;
568 case CDROMEJECT:
569 rq = blk_get_request(q, WRITE, __GFP_WAIT);
570 rq->flags |= REQ_BLOCK_PC;
571 rq->data = NULL;
572 rq->data_len = 0;
573 rq->timeout = BLK_DEFAULT_TIMEOUT;
574 memset(rq->cmd, 0, sizeof(rq->cmd));
575 rq->cmd[0] = GPCMD_START_STOP_UNIT;
576 rq->cmd[4] = 0x02 + (close != 0);
577 rq->cmd_len = 6;
578 err = blk_execute_rq(q, bd_disk, rq, 0);
579 blk_put_request(rq);
580 break;
581 default:
582 err = -ENOTTY;
583 }
584
585 blk_put_queue(q);
586 return err;
587}
588
589EXPORT_SYMBOL(scsi_cmd_ioctl);