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1 | /* |
2 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License version 2 as |
6 | * published by the Free Software Foundation. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public Licens |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111- |
17 | * |
18 | */ |
19 | #include <linux/kernel.h> |
20 | #include <linux/errno.h> |
21 | #include <linux/string.h> |
22 | #include <linux/module.h> |
23 | #include <linux/blkdev.h> |
24 | #include <linux/capability.h> |
25 | #include <linux/completion.h> |
26 | #include <linux/cdrom.h> |
27 | #include <linux/ratelimit.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/times.h> |
30 | #include <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 | 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 | } |
733 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); |
734 | |
735 | int 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 | } |
746 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); |
747 | |
748 | static int __init blk_scsi_ioctl_init(void) |
749 | { |
750 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); |
751 | return 0; |
752 | } |
753 | fs_initcall(blk_scsi_ioctl_init); |
754 |
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