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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 <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 sg_get_reserved_size(struct request_queue *q, int __user *p) |
86 | { |
87 | unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9); |
88 | |
89 | return put_user(val, p); |
90 | } |
91 | |
92 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
93 | { |
94 | int size, err = get_user(size, p); |
95 | |
96 | if (err) |
97 | return err; |
98 | |
99 | if (size < 0) |
100 | return -EINVAL; |
101 | if (size > (queue_max_sectors(q) << 9)) |
102 | size = queue_max_sectors(q) << 9; |
103 | |
104 | q->sg_reserved_size = size; |
105 | return 0; |
106 | } |
107 | |
108 | /* |
109 | * will always return that we are ATAPI even for a real SCSI drive, I'm not |
110 | * so sure this is worth doing anything about (why would you care??) |
111 | */ |
112 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
113 | { |
114 | return put_user(1, p); |
115 | } |
116 | |
117 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
118 | { |
119 | /* Basic read-only commands */ |
120 | __set_bit(TEST_UNIT_READY, filter->read_ok); |
121 | __set_bit(REQUEST_SENSE, filter->read_ok); |
122 | __set_bit(READ_6, filter->read_ok); |
123 | __set_bit(READ_10, filter->read_ok); |
124 | __set_bit(READ_12, filter->read_ok); |
125 | __set_bit(READ_16, filter->read_ok); |
126 | __set_bit(READ_BUFFER, filter->read_ok); |
127 | __set_bit(READ_DEFECT_DATA, filter->read_ok); |
128 | __set_bit(READ_CAPACITY, filter->read_ok); |
129 | __set_bit(READ_LONG, filter->read_ok); |
130 | __set_bit(INQUIRY, filter->read_ok); |
131 | __set_bit(MODE_SENSE, filter->read_ok); |
132 | __set_bit(MODE_SENSE_10, filter->read_ok); |
133 | __set_bit(LOG_SENSE, filter->read_ok); |
134 | __set_bit(START_STOP, filter->read_ok); |
135 | __set_bit(GPCMD_VERIFY_10, filter->read_ok); |
136 | __set_bit(VERIFY_16, filter->read_ok); |
137 | __set_bit(REPORT_LUNS, filter->read_ok); |
138 | __set_bit(SERVICE_ACTION_IN, filter->read_ok); |
139 | __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); |
140 | __set_bit(MAINTENANCE_IN, filter->read_ok); |
141 | __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); |
142 | |
143 | /* Audio CD commands */ |
144 | __set_bit(GPCMD_PLAY_CD, filter->read_ok); |
145 | __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); |
146 | __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); |
147 | __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); |
148 | __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); |
149 | |
150 | /* CD/DVD data reading */ |
151 | __set_bit(GPCMD_READ_CD, filter->read_ok); |
152 | __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); |
153 | __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); |
154 | __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); |
155 | __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); |
156 | __set_bit(GPCMD_READ_HEADER, filter->read_ok); |
157 | __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); |
158 | __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); |
159 | __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); |
160 | __set_bit(GPCMD_REPORT_KEY, filter->read_ok); |
161 | __set_bit(GPCMD_SCAN, filter->read_ok); |
162 | __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); |
163 | __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); |
164 | __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); |
165 | __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); |
166 | __set_bit(GPCMD_SEEK, filter->read_ok); |
167 | __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); |
168 | |
169 | /* Basic writing commands */ |
170 | __set_bit(WRITE_6, filter->write_ok); |
171 | __set_bit(WRITE_10, filter->write_ok); |
172 | __set_bit(WRITE_VERIFY, filter->write_ok); |
173 | __set_bit(WRITE_12, filter->write_ok); |
174 | __set_bit(WRITE_VERIFY_12, filter->write_ok); |
175 | __set_bit(WRITE_16, filter->write_ok); |
176 | __set_bit(WRITE_LONG, filter->write_ok); |
177 | __set_bit(WRITE_LONG_2, filter->write_ok); |
178 | __set_bit(ERASE, filter->write_ok); |
179 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); |
180 | __set_bit(MODE_SELECT, filter->write_ok); |
181 | __set_bit(LOG_SELECT, filter->write_ok); |
182 | __set_bit(GPCMD_BLANK, filter->write_ok); |
183 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); |
184 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); |
185 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); |
186 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); |
187 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); |
188 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); |
189 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); |
190 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); |
191 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); |
192 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); |
193 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); |
194 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); |
195 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); |
196 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); |
197 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
198 | } |
199 | |
200 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) |
201 | { |
202 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; |
203 | |
204 | /* root can do any command. */ |
205 | if (capable(CAP_SYS_RAWIO)) |
206 | return 0; |
207 | |
208 | /* if there's no filter set, assume we're filtering everything out */ |
209 | if (!filter) |
210 | return -EPERM; |
211 | |
212 | /* Anybody who can open the device can do a read-safe command */ |
213 | if (test_bit(cmd[0], filter->read_ok)) |
214 | return 0; |
215 | |
216 | /* Write-safe commands require a writable open */ |
217 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) |
218 | return 0; |
219 | |
220 | return -EPERM; |
221 | } |
222 | EXPORT_SYMBOL(blk_verify_command); |
223 | |
224 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
225 | struct sg_io_hdr *hdr, fmode_t mode) |
226 | { |
227 | if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) |
228 | return -EFAULT; |
229 | if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) |
230 | return -EPERM; |
231 | |
232 | /* |
233 | * fill in request structure |
234 | */ |
235 | rq->cmd_len = hdr->cmd_len; |
236 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
237 | |
238 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
239 | if (!rq->timeout) |
240 | rq->timeout = q->sg_timeout; |
241 | if (!rq->timeout) |
242 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
243 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
244 | rq->timeout = BLK_MIN_SG_TIMEOUT; |
245 | |
246 | return 0; |
247 | } |
248 | |
249 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
250 | struct bio *bio) |
251 | { |
252 | int r, ret = 0; |
253 | |
254 | /* |
255 | * fill in all the output members |
256 | */ |
257 | hdr->status = rq->errors & 0xff; |
258 | hdr->masked_status = status_byte(rq->errors); |
259 | hdr->msg_status = msg_byte(rq->errors); |
260 | hdr->host_status = host_byte(rq->errors); |
261 | hdr->driver_status = driver_byte(rq->errors); |
262 | hdr->info = 0; |
263 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) |
264 | hdr->info |= SG_INFO_CHECK; |
265 | hdr->resid = rq->resid_len; |
266 | hdr->sb_len_wr = 0; |
267 | |
268 | if (rq->sense_len && hdr->sbp) { |
269 | int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); |
270 | |
271 | if (!copy_to_user(hdr->sbp, rq->sense, len)) |
272 | hdr->sb_len_wr = len; |
273 | else |
274 | ret = -EFAULT; |
275 | } |
276 | |
277 | r = blk_rq_unmap_user(bio); |
278 | if (!ret) |
279 | ret = r; |
280 | blk_put_request(rq); |
281 | |
282 | return ret; |
283 | } |
284 | |
285 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
286 | struct sg_io_hdr *hdr, fmode_t mode) |
287 | { |
288 | unsigned long start_time; |
289 | ssize_t ret = 0; |
290 | int writing = 0; |
291 | struct request *rq; |
292 | char sense[SCSI_SENSE_BUFFERSIZE]; |
293 | struct bio *bio; |
294 | |
295 | if (hdr->interface_id != 'S') |
296 | return -EINVAL; |
297 | if (hdr->cmd_len > BLK_MAX_CDB) |
298 | return -EINVAL; |
299 | |
300 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
301 | return -EIO; |
302 | |
303 | if (hdr->dxfer_len) |
304 | switch (hdr->dxfer_direction) { |
305 | default: |
306 | return -EINVAL; |
307 | case SG_DXFER_TO_DEV: |
308 | writing = 1; |
309 | break; |
310 | case SG_DXFER_TO_FROM_DEV: |
311 | case SG_DXFER_FROM_DEV: |
312 | break; |
313 | } |
314 | |
315 | rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); |
316 | if (!rq) |
317 | return -ENOMEM; |
318 | |
319 | if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { |
320 | blk_put_request(rq); |
321 | return -EFAULT; |
322 | } |
323 | |
324 | if (hdr->iovec_count) { |
325 | size_t iov_data_len; |
326 | struct iovec *iov; |
327 | |
328 | ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count, |
329 | 0, NULL, &iov); |
330 | if (ret < 0) |
331 | goto out; |
332 | |
333 | iov_data_len = ret; |
334 | ret = 0; |
335 | |
336 | /* SG_IO howto says that the shorter of the two wins */ |
337 | if (hdr->dxfer_len < iov_data_len) { |
338 | hdr->iovec_count = iov_shorten(iov, |
339 | hdr->iovec_count, |
340 | hdr->dxfer_len); |
341 | iov_data_len = hdr->dxfer_len; |
342 | } |
343 | |
344 | ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov, |
345 | hdr->iovec_count, |
346 | iov_data_len, GFP_KERNEL); |
347 | kfree(iov); |
348 | } else if (hdr->dxfer_len) |
349 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
350 | GFP_KERNEL); |
351 | |
352 | if (ret) |
353 | goto out; |
354 | |
355 | bio = rq->bio; |
356 | memset(sense, 0, sizeof(sense)); |
357 | rq->sense = sense; |
358 | rq->sense_len = 0; |
359 | rq->retries = 0; |
360 | |
361 | start_time = jiffies; |
362 | |
363 | /* ignore return value. All information is passed back to caller |
364 | * (if he doesn't check that is his problem). |
365 | * N.B. a non-zero SCSI status is _not_ necessarily an error. |
366 | */ |
367 | blk_execute_rq(q, bd_disk, rq, 0); |
368 | |
369 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
370 | |
371 | return blk_complete_sghdr_rq(rq, hdr, bio); |
372 | out: |
373 | blk_put_request(rq); |
374 | return ret; |
375 | } |
376 | |
377 | /** |
378 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl |
379 | * @file: file this ioctl operates on (optional) |
380 | * @q: request queue to send scsi commands down |
381 | * @disk: gendisk to operate on (option) |
382 | * @sic: userspace structure describing the command to perform |
383 | * |
384 | * Send down the scsi command described by @sic to the device below |
385 | * the request queue @q. If @file is non-NULL it's used to perform |
386 | * fine-grained permission checks that allow users to send down |
387 | * non-destructive SCSI commands. If the caller has a struct gendisk |
388 | * available it should be passed in as @disk to allow the low level |
389 | * driver to use the information contained in it. A non-NULL @disk |
390 | * is only allowed if the caller knows that the low level driver doesn't |
391 | * need it (e.g. in the scsi subsystem). |
392 | * |
393 | * Notes: |
394 | * - This interface is deprecated - users should use the SG_IO |
395 | * interface instead, as this is a more flexible approach to |
396 | * performing SCSI commands on a device. |
397 | * - The SCSI command length is determined by examining the 1st byte |
398 | * of the given command. There is no way to override this. |
399 | * - Data transfers are limited to PAGE_SIZE |
400 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to |
401 | * accommodate the sense buffer when an error occurs. |
402 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that |
403 | * old code will not be surprised. |
404 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive |
405 | * a negative return and the Unix error code in 'errno'. |
406 | * If the SCSI command succeeds then 0 is returned. |
407 | * Positive numbers returned are the compacted SCSI error codes (4 |
408 | * bytes in one int) where the lowest byte is the SCSI status. |
409 | */ |
410 | #define OMAX_SB_LEN 16 /* For backward compatibility */ |
411 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
412 | struct scsi_ioctl_command __user *sic) |
413 | { |
414 | struct request *rq; |
415 | int err; |
416 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
417 | char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; |
418 | |
419 | if (!sic) |
420 | return -EINVAL; |
421 | |
422 | /* |
423 | * get in an out lengths, verify they don't exceed a page worth of data |
424 | */ |
425 | if (get_user(in_len, &sic->inlen)) |
426 | return -EFAULT; |
427 | if (get_user(out_len, &sic->outlen)) |
428 | return -EFAULT; |
429 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) |
430 | return -EINVAL; |
431 | if (get_user(opcode, sic->data)) |
432 | return -EFAULT; |
433 | |
434 | bytes = max(in_len, out_len); |
435 | if (bytes) { |
436 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
437 | if (!buffer) |
438 | return -ENOMEM; |
439 | |
440 | } |
441 | |
442 | rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT); |
443 | |
444 | cmdlen = COMMAND_SIZE(opcode); |
445 | |
446 | /* |
447 | * get command and data to send to device, if any |
448 | */ |
449 | err = -EFAULT; |
450 | rq->cmd_len = cmdlen; |
451 | if (copy_from_user(rq->cmd, sic->data, cmdlen)) |
452 | goto error; |
453 | |
454 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
455 | goto error; |
456 | |
457 | err = blk_verify_command(rq->cmd, mode & FMODE_WRITE); |
458 | if (err) |
459 | goto error; |
460 | |
461 | /* default. possible overriden later */ |
462 | rq->retries = 5; |
463 | |
464 | switch (opcode) { |
465 | case SEND_DIAGNOSTIC: |
466 | case FORMAT_UNIT: |
467 | rq->timeout = FORMAT_UNIT_TIMEOUT; |
468 | rq->retries = 1; |
469 | break; |
470 | case START_STOP: |
471 | rq->timeout = START_STOP_TIMEOUT; |
472 | break; |
473 | case MOVE_MEDIUM: |
474 | rq->timeout = MOVE_MEDIUM_TIMEOUT; |
475 | break; |
476 | case READ_ELEMENT_STATUS: |
477 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; |
478 | break; |
479 | case READ_DEFECT_DATA: |
480 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; |
481 | rq->retries = 1; |
482 | break; |
483 | default: |
484 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
485 | break; |
486 | } |
487 | |
488 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) { |
489 | err = DRIVER_ERROR << 24; |
490 | goto out; |
491 | } |
492 | |
493 | memset(sense, 0, sizeof(sense)); |
494 | rq->sense = sense; |
495 | rq->sense_len = 0; |
496 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
497 | |
498 | blk_execute_rq(q, disk, rq, 0); |
499 | |
500 | out: |
501 | err = rq->errors & 0xff; /* only 8 bit SCSI status */ |
502 | if (err) { |
503 | if (rq->sense_len && rq->sense) { |
504 | bytes = (OMAX_SB_LEN > rq->sense_len) ? |
505 | rq->sense_len : OMAX_SB_LEN; |
506 | if (copy_to_user(sic->data, rq->sense, bytes)) |
507 | err = -EFAULT; |
508 | } |
509 | } else { |
510 | if (copy_to_user(sic->data, buffer, out_len)) |
511 | err = -EFAULT; |
512 | } |
513 | |
514 | error: |
515 | kfree(buffer); |
516 | blk_put_request(rq); |
517 | return err; |
518 | } |
519 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
520 | |
521 | /* Send basic block requests */ |
522 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
523 | int cmd, int data) |
524 | { |
525 | struct request *rq; |
526 | int err; |
527 | |
528 | rq = blk_get_request(q, WRITE, __GFP_WAIT); |
529 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
530 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
531 | rq->cmd[0] = cmd; |
532 | rq->cmd[4] = data; |
533 | rq->cmd_len = 6; |
534 | err = blk_execute_rq(q, bd_disk, rq, 0); |
535 | blk_put_request(rq); |
536 | |
537 | return err; |
538 | } |
539 | |
540 | static inline int blk_send_start_stop(struct request_queue *q, |
541 | struct gendisk *bd_disk, int data) |
542 | { |
543 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); |
544 | } |
545 | |
546 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
547 | unsigned int cmd, void __user *arg) |
548 | { |
549 | int err; |
550 | |
551 | if (!q) |
552 | return -ENXIO; |
553 | |
554 | switch (cmd) { |
555 | /* |
556 | * new sgv3 interface |
557 | */ |
558 | case SG_GET_VERSION_NUM: |
559 | err = sg_get_version(arg); |
560 | break; |
561 | case SCSI_IOCTL_GET_IDLUN: |
562 | err = scsi_get_idlun(q, arg); |
563 | break; |
564 | case SCSI_IOCTL_GET_BUS_NUMBER: |
565 | err = scsi_get_bus(q, arg); |
566 | break; |
567 | case SG_SET_TIMEOUT: |
568 | err = sg_set_timeout(q, arg); |
569 | break; |
570 | case SG_GET_TIMEOUT: |
571 | err = sg_get_timeout(q); |
572 | break; |
573 | case SG_GET_RESERVED_SIZE: |
574 | err = sg_get_reserved_size(q, arg); |
575 | break; |
576 | case SG_SET_RESERVED_SIZE: |
577 | err = sg_set_reserved_size(q, arg); |
578 | break; |
579 | case SG_EMULATED_HOST: |
580 | err = sg_emulated_host(q, arg); |
581 | break; |
582 | case SG_IO: { |
583 | struct sg_io_hdr hdr; |
584 | |
585 | err = -EFAULT; |
586 | if (copy_from_user(&hdr, arg, sizeof(hdr))) |
587 | break; |
588 | err = sg_io(q, bd_disk, &hdr, mode); |
589 | if (err == -EFAULT) |
590 | break; |
591 | |
592 | if (copy_to_user(arg, &hdr, sizeof(hdr))) |
593 | err = -EFAULT; |
594 | break; |
595 | } |
596 | case CDROM_SEND_PACKET: { |
597 | struct cdrom_generic_command cgc; |
598 | struct sg_io_hdr hdr; |
599 | |
600 | err = -EFAULT; |
601 | if (copy_from_user(&cgc, arg, sizeof(cgc))) |
602 | break; |
603 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); |
604 | memset(&hdr, 0, sizeof(hdr)); |
605 | hdr.interface_id = 'S'; |
606 | hdr.cmd_len = sizeof(cgc.cmd); |
607 | hdr.dxfer_len = cgc.buflen; |
608 | err = 0; |
609 | switch (cgc.data_direction) { |
610 | case CGC_DATA_UNKNOWN: |
611 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; |
612 | break; |
613 | case CGC_DATA_WRITE: |
614 | hdr.dxfer_direction = SG_DXFER_TO_DEV; |
615 | break; |
616 | case CGC_DATA_READ: |
617 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
618 | break; |
619 | case CGC_DATA_NONE: |
620 | hdr.dxfer_direction = SG_DXFER_NONE; |
621 | break; |
622 | default: |
623 | err = -EINVAL; |
624 | } |
625 | if (err) |
626 | break; |
627 | |
628 | hdr.dxferp = cgc.buffer; |
629 | hdr.sbp = cgc.sense; |
630 | if (hdr.sbp) |
631 | hdr.mx_sb_len = sizeof(struct request_sense); |
632 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
633 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
634 | hdr.cmd_len = sizeof(cgc.cmd); |
635 | |
636 | err = sg_io(q, bd_disk, &hdr, mode); |
637 | if (err == -EFAULT) |
638 | break; |
639 | |
640 | if (hdr.status) |
641 | err = -EIO; |
642 | |
643 | cgc.stat = err; |
644 | cgc.buflen = hdr.resid; |
645 | if (copy_to_user(arg, &cgc, sizeof(cgc))) |
646 | err = -EFAULT; |
647 | |
648 | break; |
649 | } |
650 | |
651 | /* |
652 | * old junk scsi send command ioctl |
653 | */ |
654 | case SCSI_IOCTL_SEND_COMMAND: |
655 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); |
656 | err = -EINVAL; |
657 | if (!arg) |
658 | break; |
659 | |
660 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
661 | break; |
662 | case CDROMCLOSETRAY: |
663 | err = blk_send_start_stop(q, bd_disk, 0x03); |
664 | break; |
665 | case CDROMEJECT: |
666 | err = blk_send_start_stop(q, bd_disk, 0x02); |
667 | break; |
668 | default: |
669 | err = -ENOTTY; |
670 | } |
671 | |
672 | return err; |
673 | } |
674 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
675 | |
676 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
677 | { |
678 | if (bd && bd == bd->bd_contains) |
679 | return 0; |
680 | |
681 | /* Actually none of these is particularly useful on a partition, |
682 | * but they are safe. |
683 | */ |
684 | switch (cmd) { |
685 | case SCSI_IOCTL_GET_IDLUN: |
686 | case SCSI_IOCTL_GET_BUS_NUMBER: |
687 | case SCSI_IOCTL_GET_PCI: |
688 | case SCSI_IOCTL_PROBE_HOST: |
689 | case SG_GET_VERSION_NUM: |
690 | case SG_SET_TIMEOUT: |
691 | case SG_GET_TIMEOUT: |
692 | case SG_GET_RESERVED_SIZE: |
693 | case SG_SET_RESERVED_SIZE: |
694 | case SG_EMULATED_HOST: |
695 | return 0; |
696 | case CDROM_GET_CAPABILITY: |
697 | /* Keep this until we remove the printk below. udev sends it |
698 | * and we do not want to spam dmesg about it. CD-ROMs do |
699 | * not have partitions, so we get here only for disks. |
700 | */ |
701 | return -ENOIOCTLCMD; |
702 | default: |
703 | break; |
704 | } |
705 | |
706 | if (capable(CAP_SYS_RAWIO)) |
707 | return 0; |
708 | |
709 | /* In particular, rule out all resets and host-specific ioctls. */ |
710 | printk_ratelimited(KERN_WARNING |
711 | "%s: sending ioctl %x to a partition!\n", current->comm, cmd); |
712 | |
713 | return -ENOIOCTLCMD; |
714 | } |
715 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); |
716 | |
717 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
718 | unsigned int cmd, void __user *arg) |
719 | { |
720 | int ret; |
721 | |
722 | ret = scsi_verify_blk_ioctl(bd, cmd); |
723 | if (ret < 0) |
724 | return ret; |
725 | |
726 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
727 | } |
728 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); |
729 | |
730 | static int __init blk_scsi_ioctl_init(void) |
731 | { |
732 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); |
733 | return 0; |
734 | } |
735 | fs_initcall(blk_scsi_ioctl_init); |
736 |
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v2.6.34-rc5
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