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