blob: c6fee7437be44573ade684d064e161954485301a
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 <linux/uio.h> |
31 | #include <asm/uaccess.h> |
32 | |
33 | #include <scsi/scsi.h> |
34 | #include <scsi/scsi_ioctl.h> |
35 | #include <scsi/scsi_cmnd.h> |
36 | |
37 | struct blk_cmd_filter { |
38 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
39 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
40 | }; |
41 | |
42 | static struct blk_cmd_filter blk_default_cmd_filter; |
43 | |
44 | /* Command group 3 is reserved and should never be used. */ |
45 | const unsigned char scsi_command_size_tbl[8] = |
46 | { |
47 | 6, 10, 10, 12, |
48 | 16, 12, 10, 10 |
49 | }; |
50 | EXPORT_SYMBOL(scsi_command_size_tbl); |
51 | |
52 | #include <scsi/sg.h> |
53 | |
54 | static int sg_get_version(int __user *p) |
55 | { |
56 | static const int sg_version_num = 30527; |
57 | return put_user(sg_version_num, p); |
58 | } |
59 | |
60 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
61 | { |
62 | return put_user(0, p); |
63 | } |
64 | |
65 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
66 | { |
67 | return put_user(0, p); |
68 | } |
69 | |
70 | static int sg_get_timeout(struct request_queue *q) |
71 | { |
72 | return jiffies_to_clock_t(q->sg_timeout); |
73 | } |
74 | |
75 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
76 | { |
77 | int timeout, err = get_user(timeout, p); |
78 | |
79 | if (!err) |
80 | q->sg_timeout = clock_t_to_jiffies(timeout); |
81 | |
82 | return err; |
83 | } |
84 | |
85 | static int max_sectors_bytes(struct request_queue *q) |
86 | { |
87 | unsigned int max_sectors = queue_max_sectors(q); |
88 | |
89 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); |
90 | |
91 | return max_sectors << 9; |
92 | } |
93 | |
94 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
95 | { |
96 | int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); |
97 | |
98 | return put_user(val, p); |
99 | } |
100 | |
101 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
102 | { |
103 | int size, err = get_user(size, p); |
104 | |
105 | if (err) |
106 | return err; |
107 | |
108 | if (size < 0) |
109 | return -EINVAL; |
110 | |
111 | q->sg_reserved_size = min(size, max_sectors_bytes(q)); |
112 | return 0; |
113 | } |
114 | |
115 | /* |
116 | * will always return that we are ATAPI even for a real SCSI drive, I'm not |
117 | * so sure this is worth doing anything about (why would you care??) |
118 | */ |
119 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
120 | { |
121 | return put_user(1, p); |
122 | } |
123 | |
124 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
125 | { |
126 | /* Basic read-only commands */ |
127 | __set_bit(TEST_UNIT_READY, filter->read_ok); |
128 | __set_bit(REQUEST_SENSE, filter->read_ok); |
129 | __set_bit(READ_6, filter->read_ok); |
130 | __set_bit(READ_10, filter->read_ok); |
131 | __set_bit(READ_12, filter->read_ok); |
132 | __set_bit(READ_16, filter->read_ok); |
133 | __set_bit(READ_BUFFER, filter->read_ok); |
134 | __set_bit(READ_DEFECT_DATA, filter->read_ok); |
135 | __set_bit(READ_CAPACITY, filter->read_ok); |
136 | __set_bit(READ_LONG, filter->read_ok); |
137 | __set_bit(INQUIRY, filter->read_ok); |
138 | __set_bit(MODE_SENSE, filter->read_ok); |
139 | __set_bit(MODE_SENSE_10, filter->read_ok); |
140 | __set_bit(LOG_SENSE, filter->read_ok); |
141 | __set_bit(START_STOP, filter->read_ok); |
142 | __set_bit(GPCMD_VERIFY_10, filter->read_ok); |
143 | __set_bit(VERIFY_16, filter->read_ok); |
144 | __set_bit(REPORT_LUNS, filter->read_ok); |
145 | __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); |
146 | __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); |
147 | __set_bit(MAINTENANCE_IN, filter->read_ok); |
148 | __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); |
149 | |
150 | /* Audio CD commands */ |
151 | __set_bit(GPCMD_PLAY_CD, filter->read_ok); |
152 | __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); |
153 | __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); |
154 | __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); |
155 | __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); |
156 | |
157 | /* CD/DVD data reading */ |
158 | __set_bit(GPCMD_READ_CD, filter->read_ok); |
159 | __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); |
160 | __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); |
161 | __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); |
162 | __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); |
163 | __set_bit(GPCMD_READ_HEADER, filter->read_ok); |
164 | __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); |
165 | __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); |
166 | __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); |
167 | __set_bit(GPCMD_REPORT_KEY, filter->read_ok); |
168 | __set_bit(GPCMD_SCAN, filter->read_ok); |
169 | __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); |
170 | __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); |
171 | __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); |
172 | __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); |
173 | __set_bit(GPCMD_SEEK, filter->read_ok); |
174 | __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); |
175 | |
176 | /* Basic writing commands */ |
177 | __set_bit(WRITE_6, filter->write_ok); |
178 | __set_bit(WRITE_10, filter->write_ok); |
179 | __set_bit(WRITE_VERIFY, filter->write_ok); |
180 | __set_bit(WRITE_12, filter->write_ok); |
181 | __set_bit(WRITE_VERIFY_12, filter->write_ok); |
182 | __set_bit(WRITE_16, filter->write_ok); |
183 | __set_bit(WRITE_LONG, filter->write_ok); |
184 | __set_bit(WRITE_LONG_2, filter->write_ok); |
185 | __set_bit(WRITE_SAME, filter->write_ok); |
186 | __set_bit(WRITE_SAME_16, filter->write_ok); |
187 | __set_bit(WRITE_SAME_32, filter->write_ok); |
188 | __set_bit(ERASE, filter->write_ok); |
189 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); |
190 | __set_bit(MODE_SELECT, filter->write_ok); |
191 | __set_bit(LOG_SELECT, filter->write_ok); |
192 | __set_bit(GPCMD_BLANK, filter->write_ok); |
193 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); |
194 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); |
195 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); |
196 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); |
197 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); |
198 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); |
199 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); |
200 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); |
201 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); |
202 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); |
203 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); |
204 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); |
205 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); |
206 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); |
207 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
208 | } |
209 | |
210 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) |
211 | { |
212 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; |
213 | |
214 | /* root can do any command. */ |
215 | if (capable(CAP_SYS_RAWIO)) |
216 | return 0; |
217 | |
218 | /* Anybody who can open the device can do a read-safe command */ |
219 | if (test_bit(cmd[0], filter->read_ok)) |
220 | return 0; |
221 | |
222 | /* Write-safe commands require a writable open */ |
223 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) |
224 | return 0; |
225 | |
226 | return -EPERM; |
227 | } |
228 | EXPORT_SYMBOL(blk_verify_command); |
229 | |
230 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
231 | struct sg_io_hdr *hdr, fmode_t mode) |
232 | { |
233 | if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) |
234 | return -EFAULT; |
235 | if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) |
236 | return -EPERM; |
237 | |
238 | /* |
239 | * fill in request structure |
240 | */ |
241 | rq->cmd_len = hdr->cmd_len; |
242 | |
243 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
244 | if (!rq->timeout) |
245 | rq->timeout = q->sg_timeout; |
246 | if (!rq->timeout) |
247 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
248 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
249 | rq->timeout = BLK_MIN_SG_TIMEOUT; |
250 | |
251 | return 0; |
252 | } |
253 | |
254 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
255 | struct bio *bio) |
256 | { |
257 | int r, ret = 0; |
258 | |
259 | /* |
260 | * fill in all the output members |
261 | */ |
262 | hdr->status = rq->errors & 0xff; |
263 | hdr->masked_status = status_byte(rq->errors); |
264 | hdr->msg_status = msg_byte(rq->errors); |
265 | hdr->host_status = host_byte(rq->errors); |
266 | hdr->driver_status = driver_byte(rq->errors); |
267 | hdr->info = 0; |
268 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) |
269 | hdr->info |= SG_INFO_CHECK; |
270 | hdr->resid = rq->resid_len; |
271 | hdr->sb_len_wr = 0; |
272 | |
273 | if (rq->sense_len && hdr->sbp) { |
274 | int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); |
275 | |
276 | if (!copy_to_user(hdr->sbp, rq->sense, len)) |
277 | hdr->sb_len_wr = len; |
278 | else |
279 | ret = -EFAULT; |
280 | } |
281 | |
282 | r = blk_rq_unmap_user(bio); |
283 | if (!ret) |
284 | ret = r; |
285 | |
286 | return ret; |
287 | } |
288 | |
289 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
290 | struct sg_io_hdr *hdr, fmode_t mode) |
291 | { |
292 | unsigned long start_time; |
293 | ssize_t ret = 0; |
294 | int writing = 0; |
295 | int at_head = 0; |
296 | struct request *rq; |
297 | char sense[SCSI_SENSE_BUFFERSIZE]; |
298 | struct bio *bio; |
299 | |
300 | if (hdr->interface_id != 'S') |
301 | return -EINVAL; |
302 | |
303 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
304 | return -EIO; |
305 | |
306 | if (hdr->dxfer_len) |
307 | switch (hdr->dxfer_direction) { |
308 | default: |
309 | return -EINVAL; |
310 | case SG_DXFER_TO_DEV: |
311 | writing = 1; |
312 | break; |
313 | case SG_DXFER_TO_FROM_DEV: |
314 | case SG_DXFER_FROM_DEV: |
315 | break; |
316 | } |
317 | if (hdr->flags & SG_FLAG_Q_AT_HEAD) |
318 | at_head = 1; |
319 | |
320 | ret = -ENOMEM; |
321 | rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); |
322 | if (IS_ERR(rq)) |
323 | return PTR_ERR(rq); |
324 | blk_rq_set_block_pc(rq); |
325 | |
326 | if (hdr->cmd_len > BLK_MAX_CDB) { |
327 | rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); |
328 | if (!rq->cmd) |
329 | goto out_put_request; |
330 | } |
331 | |
332 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
333 | if (ret < 0) |
334 | goto out_free_cdb; |
335 | |
336 | ret = 0; |
337 | if (hdr->iovec_count) { |
338 | struct iov_iter i; |
339 | struct iovec *iov = NULL; |
340 | |
341 | ret = import_iovec(rq_data_dir(rq), |
342 | hdr->dxferp, hdr->iovec_count, |
343 | 0, &iov, &i); |
344 | if (ret < 0) |
345 | goto out_free_cdb; |
346 | |
347 | /* SG_IO howto says that the shorter of the two wins */ |
348 | iov_iter_truncate(&i, hdr->dxfer_len); |
349 | |
350 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
351 | kfree(iov); |
352 | } else if (hdr->dxfer_len) |
353 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
354 | GFP_KERNEL); |
355 | |
356 | if (ret) |
357 | goto out_free_cdb; |
358 | |
359 | bio = rq->bio; |
360 | memset(sense, 0, sizeof(sense)); |
361 | rq->sense = sense; |
362 | rq->sense_len = 0; |
363 | rq->retries = 0; |
364 | |
365 | start_time = jiffies; |
366 | |
367 | /* ignore return value. All information is passed back to caller |
368 | * (if he doesn't check that is his problem). |
369 | * N.B. a non-zero SCSI status is _not_ necessarily an error. |
370 | */ |
371 | blk_execute_rq(q, bd_disk, rq, at_head); |
372 | |
373 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
374 | |
375 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
376 | |
377 | out_free_cdb: |
378 | if (rq->cmd != rq->__cmd) |
379 | kfree(rq->cmd); |
380 | out_put_request: |
381 | blk_put_request(rq); |
382 | return ret; |
383 | } |
384 | |
385 | /** |
386 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl |
387 | * @file: file this ioctl operates on (optional) |
388 | * @q: request queue to send scsi commands down |
389 | * @disk: gendisk to operate on (option) |
390 | * @sic: userspace structure describing the command to perform |
391 | * |
392 | * Send down the scsi command described by @sic to the device below |
393 | * the request queue @q. If @file is non-NULL it's used to perform |
394 | * fine-grained permission checks that allow users to send down |
395 | * non-destructive SCSI commands. If the caller has a struct gendisk |
396 | * available it should be passed in as @disk to allow the low level |
397 | * driver to use the information contained in it. A non-NULL @disk |
398 | * is only allowed if the caller knows that the low level driver doesn't |
399 | * need it (e.g. in the scsi subsystem). |
400 | * |
401 | * Notes: |
402 | * - This interface is deprecated - users should use the SG_IO |
403 | * interface instead, as this is a more flexible approach to |
404 | * performing SCSI commands on a device. |
405 | * - The SCSI command length is determined by examining the 1st byte |
406 | * of the given command. There is no way to override this. |
407 | * - Data transfers are limited to PAGE_SIZE |
408 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to |
409 | * accommodate the sense buffer when an error occurs. |
410 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that |
411 | * old code will not be surprised. |
412 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive |
413 | * a negative return and the Unix error code in 'errno'. |
414 | * If the SCSI command succeeds then 0 is returned. |
415 | * Positive numbers returned are the compacted SCSI error codes (4 |
416 | * bytes in one int) where the lowest byte is the SCSI status. |
417 | */ |
418 | #define OMAX_SB_LEN 16 /* For backward compatibility */ |
419 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
420 | struct scsi_ioctl_command __user *sic) |
421 | { |
422 | struct request *rq; |
423 | int err; |
424 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
425 | char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; |
426 | |
427 | if (!sic) |
428 | return -EINVAL; |
429 | |
430 | /* |
431 | * get in an out lengths, verify they don't exceed a page worth of data |
432 | */ |
433 | if (get_user(in_len, &sic->inlen)) |
434 | return -EFAULT; |
435 | if (get_user(out_len, &sic->outlen)) |
436 | return -EFAULT; |
437 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) |
438 | return -EINVAL; |
439 | if (get_user(opcode, sic->data)) |
440 | return -EFAULT; |
441 | |
442 | bytes = max(in_len, out_len); |
443 | if (bytes) { |
444 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
445 | if (!buffer) |
446 | return -ENOMEM; |
447 | |
448 | } |
449 | |
450 | rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_RECLAIM); |
451 | if (IS_ERR(rq)) { |
452 | err = PTR_ERR(rq); |
453 | goto error_free_buffer; |
454 | } |
455 | blk_rq_set_block_pc(rq); |
456 | |
457 | cmdlen = COMMAND_SIZE(opcode); |
458 | |
459 | /* |
460 | * get command and data to send to device, if any |
461 | */ |
462 | err = -EFAULT; |
463 | rq->cmd_len = cmdlen; |
464 | if (copy_from_user(rq->cmd, sic->data, cmdlen)) |
465 | goto error; |
466 | |
467 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
468 | goto error; |
469 | |
470 | err = blk_verify_command(rq->cmd, mode & FMODE_WRITE); |
471 | if (err) |
472 | goto error; |
473 | |
474 | /* default. possible overriden later */ |
475 | rq->retries = 5; |
476 | |
477 | switch (opcode) { |
478 | case SEND_DIAGNOSTIC: |
479 | case FORMAT_UNIT: |
480 | rq->timeout = FORMAT_UNIT_TIMEOUT; |
481 | rq->retries = 1; |
482 | break; |
483 | case START_STOP: |
484 | rq->timeout = START_STOP_TIMEOUT; |
485 | break; |
486 | case MOVE_MEDIUM: |
487 | rq->timeout = MOVE_MEDIUM_TIMEOUT; |
488 | break; |
489 | case READ_ELEMENT_STATUS: |
490 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; |
491 | break; |
492 | case READ_DEFECT_DATA: |
493 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; |
494 | rq->retries = 1; |
495 | break; |
496 | default: |
497 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
498 | break; |
499 | } |
500 | |
501 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) { |
502 | err = DRIVER_ERROR << 24; |
503 | goto error; |
504 | } |
505 | |
506 | memset(sense, 0, sizeof(sense)); |
507 | rq->sense = sense; |
508 | rq->sense_len = 0; |
509 | |
510 | blk_execute_rq(q, disk, rq, 0); |
511 | |
512 | err = rq->errors & 0xff; /* only 8 bit SCSI status */ |
513 | if (err) { |
514 | if (rq->sense_len && rq->sense) { |
515 | bytes = (OMAX_SB_LEN > rq->sense_len) ? |
516 | rq->sense_len : OMAX_SB_LEN; |
517 | if (copy_to_user(sic->data, rq->sense, bytes)) |
518 | err = -EFAULT; |
519 | } |
520 | } else { |
521 | if (copy_to_user(sic->data, buffer, out_len)) |
522 | err = -EFAULT; |
523 | } |
524 | |
525 | error: |
526 | blk_put_request(rq); |
527 | |
528 | error_free_buffer: |
529 | kfree(buffer); |
530 | |
531 | return err; |
532 | } |
533 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
534 | |
535 | /* Send basic block requests */ |
536 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
537 | int cmd, int data) |
538 | { |
539 | struct request *rq; |
540 | int err; |
541 | |
542 | rq = blk_get_request(q, WRITE, __GFP_RECLAIM); |
543 | if (IS_ERR(rq)) |
544 | return PTR_ERR(rq); |
545 | blk_rq_set_block_pc(rq); |
546 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
547 | rq->cmd[0] = cmd; |
548 | rq->cmd[4] = data; |
549 | rq->cmd_len = 6; |
550 | err = blk_execute_rq(q, bd_disk, rq, 0); |
551 | blk_put_request(rq); |
552 | |
553 | return err; |
554 | } |
555 | |
556 | static inline int blk_send_start_stop(struct request_queue *q, |
557 | struct gendisk *bd_disk, int data) |
558 | { |
559 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); |
560 | } |
561 | |
562 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
563 | unsigned int cmd, void __user *arg) |
564 | { |
565 | int err; |
566 | |
567 | if (!q) |
568 | return -ENXIO; |
569 | |
570 | switch (cmd) { |
571 | /* |
572 | * new sgv3 interface |
573 | */ |
574 | case SG_GET_VERSION_NUM: |
575 | err = sg_get_version(arg); |
576 | break; |
577 | case SCSI_IOCTL_GET_IDLUN: |
578 | err = scsi_get_idlun(q, arg); |
579 | break; |
580 | case SCSI_IOCTL_GET_BUS_NUMBER: |
581 | err = scsi_get_bus(q, arg); |
582 | break; |
583 | case SG_SET_TIMEOUT: |
584 | err = sg_set_timeout(q, arg); |
585 | break; |
586 | case SG_GET_TIMEOUT: |
587 | err = sg_get_timeout(q); |
588 | break; |
589 | case SG_GET_RESERVED_SIZE: |
590 | err = sg_get_reserved_size(q, arg); |
591 | break; |
592 | case SG_SET_RESERVED_SIZE: |
593 | err = sg_set_reserved_size(q, arg); |
594 | break; |
595 | case SG_EMULATED_HOST: |
596 | err = sg_emulated_host(q, arg); |
597 | break; |
598 | case SG_IO: { |
599 | struct sg_io_hdr hdr; |
600 | |
601 | err = -EFAULT; |
602 | if (copy_from_user(&hdr, arg, sizeof(hdr))) |
603 | break; |
604 | err = sg_io(q, bd_disk, &hdr, mode); |
605 | if (err == -EFAULT) |
606 | break; |
607 | |
608 | if (copy_to_user(arg, &hdr, sizeof(hdr))) |
609 | err = -EFAULT; |
610 | break; |
611 | } |
612 | case CDROM_SEND_PACKET: { |
613 | struct cdrom_generic_command cgc; |
614 | struct sg_io_hdr hdr; |
615 | |
616 | err = -EFAULT; |
617 | if (copy_from_user(&cgc, arg, sizeof(cgc))) |
618 | break; |
619 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); |
620 | memset(&hdr, 0, sizeof(hdr)); |
621 | hdr.interface_id = 'S'; |
622 | hdr.cmd_len = sizeof(cgc.cmd); |
623 | hdr.dxfer_len = cgc.buflen; |
624 | err = 0; |
625 | switch (cgc.data_direction) { |
626 | case CGC_DATA_UNKNOWN: |
627 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; |
628 | break; |
629 | case CGC_DATA_WRITE: |
630 | hdr.dxfer_direction = SG_DXFER_TO_DEV; |
631 | break; |
632 | case CGC_DATA_READ: |
633 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
634 | break; |
635 | case CGC_DATA_NONE: |
636 | hdr.dxfer_direction = SG_DXFER_NONE; |
637 | break; |
638 | default: |
639 | err = -EINVAL; |
640 | } |
641 | if (err) |
642 | break; |
643 | |
644 | hdr.dxferp = cgc.buffer; |
645 | hdr.sbp = cgc.sense; |
646 | if (hdr.sbp) |
647 | hdr.mx_sb_len = sizeof(struct request_sense); |
648 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
649 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
650 | hdr.cmd_len = sizeof(cgc.cmd); |
651 | |
652 | err = sg_io(q, bd_disk, &hdr, mode); |
653 | if (err == -EFAULT) |
654 | break; |
655 | |
656 | if (hdr.status) |
657 | err = -EIO; |
658 | |
659 | cgc.stat = err; |
660 | cgc.buflen = hdr.resid; |
661 | if (copy_to_user(arg, &cgc, sizeof(cgc))) |
662 | err = -EFAULT; |
663 | |
664 | break; |
665 | } |
666 | |
667 | /* |
668 | * old junk scsi send command ioctl |
669 | */ |
670 | case SCSI_IOCTL_SEND_COMMAND: |
671 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); |
672 | err = -EINVAL; |
673 | if (!arg) |
674 | break; |
675 | |
676 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
677 | break; |
678 | case CDROMCLOSETRAY: |
679 | err = blk_send_start_stop(q, bd_disk, 0x03); |
680 | break; |
681 | case CDROMEJECT: |
682 | err = blk_send_start_stop(q, bd_disk, 0x02); |
683 | break; |
684 | default: |
685 | err = -ENOTTY; |
686 | } |
687 | |
688 | return err; |
689 | } |
690 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
691 | |
692 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
693 | { |
694 | if (bd && bd == bd->bd_contains) |
695 | return 0; |
696 | |
697 | /* Actually none of these is particularly useful on a partition, |
698 | * but they are safe. |
699 | */ |
700 | switch (cmd) { |
701 | case SCSI_IOCTL_GET_IDLUN: |
702 | case SCSI_IOCTL_GET_BUS_NUMBER: |
703 | case SCSI_IOCTL_GET_PCI: |
704 | case SCSI_IOCTL_PROBE_HOST: |
705 | case SG_GET_VERSION_NUM: |
706 | case SG_SET_TIMEOUT: |
707 | case SG_GET_TIMEOUT: |
708 | case SG_GET_RESERVED_SIZE: |
709 | case SG_SET_RESERVED_SIZE: |
710 | case SG_EMULATED_HOST: |
711 | return 0; |
712 | case CDROM_GET_CAPABILITY: |
713 | /* Keep this until we remove the printk below. udev sends it |
714 | * and we do not want to spam dmesg about it. CD-ROMs do |
715 | * not have partitions, so we get here only for disks. |
716 | */ |
717 | return -ENOIOCTLCMD; |
718 | default: |
719 | break; |
720 | } |
721 | |
722 | if (capable(CAP_SYS_RAWIO)) |
723 | return 0; |
724 | |
725 | /* In particular, rule out all resets and host-specific ioctls. */ |
726 | printk_ratelimited(KERN_WARNING |
727 | "%s: sending ioctl %x to a partition!\n", current->comm, cmd); |
728 | |
729 | return -ENOIOCTLCMD; |
730 | } |
731 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); |
732 | |
733 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
734 | unsigned int cmd, void __user *arg) |
735 | { |
736 | int ret; |
737 | |
738 | ret = scsi_verify_blk_ioctl(bd, cmd); |
739 | if (ret < 0) |
740 | return ret; |
741 | |
742 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
743 | } |
744 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); |
745 | |
746 | static int __init blk_scsi_ioctl_init(void) |
747 | { |
748 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); |
749 | return 0; |
750 | } |
751 | fs_initcall(blk_scsi_ioctl_init); |
752 |