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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/slab.h> |
28 | #include <linux/times.h> |
29 | #include <asm/uaccess.h> |
30 | |
31 | #include <scsi/scsi.h> |
32 | #include <scsi/scsi_ioctl.h> |
33 | #include <scsi/scsi_cmnd.h> |
34 | |
35 | struct blk_cmd_filter { |
36 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
37 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
38 | }; |
39 | |
40 | static struct blk_cmd_filter blk_default_cmd_filter; |
41 | |
42 | /* Command group 3 is reserved and should never be used. */ |
43 | const unsigned char scsi_command_size_tbl[8] = |
44 | { |
45 | 6, 10, 10, 12, |
46 | 16, 12, 10, 10 |
47 | }; |
48 | EXPORT_SYMBOL(scsi_command_size_tbl); |
49 | |
50 | #include <scsi/sg.h> |
51 | |
52 | static int sg_get_version(int __user *p) |
53 | { |
54 | static const int sg_version_num = 30527; |
55 | return put_user(sg_version_num, p); |
56 | } |
57 | |
58 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
59 | { |
60 | return put_user(0, p); |
61 | } |
62 | |
63 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
64 | { |
65 | return put_user(0, p); |
66 | } |
67 | |
68 | static int sg_get_timeout(struct request_queue *q) |
69 | { |
70 | return jiffies_to_clock_t(q->sg_timeout); |
71 | } |
72 | |
73 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
74 | { |
75 | int timeout, err = get_user(timeout, p); |
76 | |
77 | if (!err) |
78 | q->sg_timeout = clock_t_to_jiffies(timeout); |
79 | |
80 | return err; |
81 | } |
82 | |
83 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
84 | { |
85 | unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9); |
86 | |
87 | return put_user(val, p); |
88 | } |
89 | |
90 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
91 | { |
92 | int size, err = get_user(size, p); |
93 | |
94 | if (err) |
95 | return err; |
96 | |
97 | if (size < 0) |
98 | return -EINVAL; |
99 | if (size > (queue_max_sectors(q) << 9)) |
100 | size = queue_max_sectors(q) << 9; |
101 | |
102 | q->sg_reserved_size = size; |
103 | return 0; |
104 | } |
105 | |
106 | /* |
107 | * will always return that we are ATAPI even for a real SCSI drive, I'm not |
108 | * so sure this is worth doing anything about (why would you care??) |
109 | */ |
110 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
111 | { |
112 | return put_user(1, p); |
113 | } |
114 | |
115 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
116 | { |
117 | /* Basic read-only commands */ |
118 | __set_bit(TEST_UNIT_READY, filter->read_ok); |
119 | __set_bit(REQUEST_SENSE, filter->read_ok); |
120 | __set_bit(READ_6, filter->read_ok); |
121 | __set_bit(READ_10, filter->read_ok); |
122 | __set_bit(READ_12, filter->read_ok); |
123 | __set_bit(READ_16, filter->read_ok); |
124 | __set_bit(READ_BUFFER, filter->read_ok); |
125 | __set_bit(READ_DEFECT_DATA, filter->read_ok); |
126 | __set_bit(READ_CAPACITY, filter->read_ok); |
127 | __set_bit(READ_LONG, filter->read_ok); |
128 | __set_bit(INQUIRY, filter->read_ok); |
129 | __set_bit(MODE_SENSE, filter->read_ok); |
130 | __set_bit(MODE_SENSE_10, filter->read_ok); |
131 | __set_bit(LOG_SENSE, filter->read_ok); |
132 | __set_bit(START_STOP, filter->read_ok); |
133 | __set_bit(GPCMD_VERIFY_10, filter->read_ok); |
134 | __set_bit(VERIFY_16, filter->read_ok); |
135 | __set_bit(REPORT_LUNS, filter->read_ok); |
136 | __set_bit(SERVICE_ACTION_IN, filter->read_ok); |
137 | __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); |
138 | __set_bit(MAINTENANCE_IN, filter->read_ok); |
139 | __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); |
140 | |
141 | /* Audio CD commands */ |
142 | __set_bit(GPCMD_PLAY_CD, filter->read_ok); |
143 | __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); |
144 | __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); |
145 | __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); |
146 | __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); |
147 | |
148 | /* CD/DVD data reading */ |
149 | __set_bit(GPCMD_READ_CD, filter->read_ok); |
150 | __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); |
151 | __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); |
152 | __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); |
153 | __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); |
154 | __set_bit(GPCMD_READ_HEADER, filter->read_ok); |
155 | __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); |
156 | __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); |
157 | __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); |
158 | __set_bit(GPCMD_REPORT_KEY, filter->read_ok); |
159 | __set_bit(GPCMD_SCAN, filter->read_ok); |
160 | __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); |
161 | __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); |
162 | __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); |
163 | __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); |
164 | __set_bit(GPCMD_SEEK, filter->read_ok); |
165 | __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); |
166 | |
167 | /* Basic writing commands */ |
168 | __set_bit(WRITE_6, filter->write_ok); |
169 | __set_bit(WRITE_10, filter->write_ok); |
170 | __set_bit(WRITE_VERIFY, filter->write_ok); |
171 | __set_bit(WRITE_12, filter->write_ok); |
172 | __set_bit(WRITE_VERIFY_12, filter->write_ok); |
173 | __set_bit(WRITE_16, filter->write_ok); |
174 | __set_bit(WRITE_LONG, filter->write_ok); |
175 | __set_bit(WRITE_LONG_2, filter->write_ok); |
176 | __set_bit(ERASE, filter->write_ok); |
177 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); |
178 | __set_bit(MODE_SELECT, filter->write_ok); |
179 | __set_bit(LOG_SELECT, filter->write_ok); |
180 | __set_bit(GPCMD_BLANK, filter->write_ok); |
181 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); |
182 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); |
183 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); |
184 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); |
185 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); |
186 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); |
187 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); |
188 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); |
189 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); |
190 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); |
191 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); |
192 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); |
193 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); |
194 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); |
195 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
196 | } |
197 | |
198 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) |
199 | { |
200 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; |
201 | |
202 | /* root can do any command. */ |
203 | if (capable(CAP_SYS_RAWIO)) |
204 | return 0; |
205 | |
206 | /* if there's no filter set, assume we're filtering everything out */ |
207 | if (!filter) |
208 | return -EPERM; |
209 | |
210 | /* Anybody who can open the device can do a read-safe command */ |
211 | if (test_bit(cmd[0], filter->read_ok)) |
212 | return 0; |
213 | |
214 | /* Write-safe commands require a writable open */ |
215 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) |
216 | return 0; |
217 | |
218 | return -EPERM; |
219 | } |
220 | EXPORT_SYMBOL(blk_verify_command); |
221 | |
222 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
223 | struct sg_io_hdr *hdr, fmode_t mode) |
224 | { |
225 | if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) |
226 | return -EFAULT; |
227 | if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) |
228 | return -EPERM; |
229 | |
230 | /* |
231 | * fill in request structure |
232 | */ |
233 | rq->cmd_len = hdr->cmd_len; |
234 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
235 | |
236 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
237 | if (!rq->timeout) |
238 | rq->timeout = q->sg_timeout; |
239 | if (!rq->timeout) |
240 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
241 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
242 | rq->timeout = BLK_MIN_SG_TIMEOUT; |
243 | |
244 | return 0; |
245 | } |
246 | |
247 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
248 | struct bio *bio) |
249 | { |
250 | int r, ret = 0; |
251 | |
252 | /* |
253 | * fill in all the output members |
254 | */ |
255 | hdr->status = rq->errors & 0xff; |
256 | hdr->masked_status = status_byte(rq->errors); |
257 | hdr->msg_status = msg_byte(rq->errors); |
258 | hdr->host_status = host_byte(rq->errors); |
259 | hdr->driver_status = driver_byte(rq->errors); |
260 | hdr->info = 0; |
261 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) |
262 | hdr->info |= SG_INFO_CHECK; |
263 | hdr->resid = rq->resid_len; |
264 | hdr->sb_len_wr = 0; |
265 | |
266 | if (rq->sense_len && hdr->sbp) { |
267 | int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); |
268 | |
269 | if (!copy_to_user(hdr->sbp, rq->sense, len)) |
270 | hdr->sb_len_wr = len; |
271 | else |
272 | ret = -EFAULT; |
273 | } |
274 | |
275 | r = blk_rq_unmap_user(bio); |
276 | if (!ret) |
277 | ret = r; |
278 | blk_put_request(rq); |
279 | |
280 | return ret; |
281 | } |
282 | |
283 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
284 | struct sg_io_hdr *hdr, fmode_t mode) |
285 | { |
286 | unsigned long start_time; |
287 | int writing = 0, ret = 0; |
288 | struct request *rq; |
289 | char sense[SCSI_SENSE_BUFFERSIZE]; |
290 | struct bio *bio; |
291 | |
292 | if (hdr->interface_id != 'S') |
293 | return -EINVAL; |
294 | if (hdr->cmd_len > BLK_MAX_CDB) |
295 | return -EINVAL; |
296 | |
297 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
298 | return -EIO; |
299 | |
300 | if (hdr->dxfer_len) |
301 | switch (hdr->dxfer_direction) { |
302 | default: |
303 | return -EINVAL; |
304 | case SG_DXFER_TO_DEV: |
305 | writing = 1; |
306 | break; |
307 | case SG_DXFER_TO_FROM_DEV: |
308 | case SG_DXFER_FROM_DEV: |
309 | break; |
310 | } |
311 | |
312 | rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); |
313 | if (!rq) |
314 | return -ENOMEM; |
315 | |
316 | if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { |
317 | blk_put_request(rq); |
318 | return -EFAULT; |
319 | } |
320 | |
321 | if (hdr->iovec_count) { |
322 | const int size = sizeof(struct sg_iovec) * hdr->iovec_count; |
323 | size_t iov_data_len; |
324 | struct sg_iovec *sg_iov; |
325 | struct iovec *iov; |
326 | int i; |
327 | |
328 | sg_iov = kmalloc(size, GFP_KERNEL); |
329 | if (!sg_iov) { |
330 | ret = -ENOMEM; |
331 | goto out; |
332 | } |
333 | |
334 | if (copy_from_user(sg_iov, hdr->dxferp, size)) { |
335 | kfree(sg_iov); |
336 | ret = -EFAULT; |
337 | goto out; |
338 | } |
339 | |
340 | /* |
341 | * Sum up the vecs, making sure they don't overflow |
342 | */ |
343 | iov = (struct iovec *) sg_iov; |
344 | iov_data_len = 0; |
345 | for (i = 0; i < hdr->iovec_count; i++) { |
346 | if (iov_data_len + iov[i].iov_len < iov_data_len) { |
347 | kfree(sg_iov); |
348 | ret = -EINVAL; |
349 | goto out; |
350 | } |
351 | iov_data_len += iov[i].iov_len; |
352 | } |
353 | |
354 | /* SG_IO howto says that the shorter of the two wins */ |
355 | if (hdr->dxfer_len < iov_data_len) { |
356 | hdr->iovec_count = iov_shorten(iov, |
357 | hdr->iovec_count, |
358 | hdr->dxfer_len); |
359 | iov_data_len = hdr->dxfer_len; |
360 | } |
361 | |
362 | ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count, |
363 | iov_data_len, GFP_KERNEL); |
364 | kfree(sg_iov); |
365 | } else if (hdr->dxfer_len) |
366 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
367 | GFP_KERNEL); |
368 | |
369 | if (ret) |
370 | goto out; |
371 | |
372 | bio = rq->bio; |
373 | memset(sense, 0, sizeof(sense)); |
374 | rq->sense = sense; |
375 | rq->sense_len = 0; |
376 | rq->retries = 0; |
377 | |
378 | start_time = jiffies; |
379 | |
380 | /* ignore return value. All information is passed back to caller |
381 | * (if he doesn't check that is his problem). |
382 | * N.B. a non-zero SCSI status is _not_ necessarily an error. |
383 | */ |
384 | blk_execute_rq(q, bd_disk, rq, 0); |
385 | |
386 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
387 | |
388 | return blk_complete_sghdr_rq(rq, hdr, bio); |
389 | out: |
390 | blk_put_request(rq); |
391 | return ret; |
392 | } |
393 | |
394 | /** |
395 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl |
396 | * @file: file this ioctl operates on (optional) |
397 | * @q: request queue to send scsi commands down |
398 | * @disk: gendisk to operate on (option) |
399 | * @sic: userspace structure describing the command to perform |
400 | * |
401 | * Send down the scsi command described by @sic to the device below |
402 | * the request queue @q. If @file is non-NULL it's used to perform |
403 | * fine-grained permission checks that allow users to send down |
404 | * non-destructive SCSI commands. If the caller has a struct gendisk |
405 | * available it should be passed in as @disk to allow the low level |
406 | * driver to use the information contained in it. A non-NULL @disk |
407 | * is only allowed if the caller knows that the low level driver doesn't |
408 | * need it (e.g. in the scsi subsystem). |
409 | * |
410 | * Notes: |
411 | * - This interface is deprecated - users should use the SG_IO |
412 | * interface instead, as this is a more flexible approach to |
413 | * performing SCSI commands on a device. |
414 | * - The SCSI command length is determined by examining the 1st byte |
415 | * of the given command. There is no way to override this. |
416 | * - Data transfers are limited to PAGE_SIZE |
417 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to |
418 | * accommodate the sense buffer when an error occurs. |
419 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that |
420 | * old code will not be surprised. |
421 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive |
422 | * a negative return and the Unix error code in 'errno'. |
423 | * If the SCSI command succeeds then 0 is returned. |
424 | * Positive numbers returned are the compacted SCSI error codes (4 |
425 | * bytes in one int) where the lowest byte is the SCSI status. |
426 | */ |
427 | #define OMAX_SB_LEN 16 /* For backward compatibility */ |
428 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
429 | struct scsi_ioctl_command __user *sic) |
430 | { |
431 | struct request *rq; |
432 | int err; |
433 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
434 | char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; |
435 | |
436 | if (!sic) |
437 | return -EINVAL; |
438 | |
439 | /* |
440 | * get in an out lengths, verify they don't exceed a page worth of data |
441 | */ |
442 | if (get_user(in_len, &sic->inlen)) |
443 | return -EFAULT; |
444 | if (get_user(out_len, &sic->outlen)) |
445 | return -EFAULT; |
446 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) |
447 | return -EINVAL; |
448 | if (get_user(opcode, sic->data)) |
449 | return -EFAULT; |
450 | |
451 | bytes = max(in_len, out_len); |
452 | if (bytes) { |
453 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
454 | if (!buffer) |
455 | return -ENOMEM; |
456 | |
457 | } |
458 | |
459 | rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT); |
460 | |
461 | cmdlen = COMMAND_SIZE(opcode); |
462 | |
463 | /* |
464 | * get command and data to send to device, if any |
465 | */ |
466 | err = -EFAULT; |
467 | rq->cmd_len = cmdlen; |
468 | if (copy_from_user(rq->cmd, sic->data, cmdlen)) |
469 | goto error; |
470 | |
471 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
472 | goto error; |
473 | |
474 | err = blk_verify_command(rq->cmd, mode & FMODE_WRITE); |
475 | if (err) |
476 | goto error; |
477 | |
478 | /* default. possible overriden later */ |
479 | rq->retries = 5; |
480 | |
481 | switch (opcode) { |
482 | case SEND_DIAGNOSTIC: |
483 | case FORMAT_UNIT: |
484 | rq->timeout = FORMAT_UNIT_TIMEOUT; |
485 | rq->retries = 1; |
486 | break; |
487 | case START_STOP: |
488 | rq->timeout = START_STOP_TIMEOUT; |
489 | break; |
490 | case MOVE_MEDIUM: |
491 | rq->timeout = MOVE_MEDIUM_TIMEOUT; |
492 | break; |
493 | case READ_ELEMENT_STATUS: |
494 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; |
495 | break; |
496 | case READ_DEFECT_DATA: |
497 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; |
498 | rq->retries = 1; |
499 | break; |
500 | default: |
501 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
502 | break; |
503 | } |
504 | |
505 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) { |
506 | err = DRIVER_ERROR << 24; |
507 | goto out; |
508 | } |
509 | |
510 | memset(sense, 0, sizeof(sense)); |
511 | rq->sense = sense; |
512 | rq->sense_len = 0; |
513 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
514 | |
515 | blk_execute_rq(q, disk, rq, 0); |
516 | |
517 | out: |
518 | err = rq->errors & 0xff; /* only 8 bit SCSI status */ |
519 | if (err) { |
520 | if (rq->sense_len && rq->sense) { |
521 | bytes = (OMAX_SB_LEN > rq->sense_len) ? |
522 | rq->sense_len : OMAX_SB_LEN; |
523 | if (copy_to_user(sic->data, rq->sense, bytes)) |
524 | err = -EFAULT; |
525 | } |
526 | } else { |
527 | if (copy_to_user(sic->data, buffer, out_len)) |
528 | err = -EFAULT; |
529 | } |
530 | |
531 | error: |
532 | kfree(buffer); |
533 | blk_put_request(rq); |
534 | return err; |
535 | } |
536 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
537 | |
538 | /* Send basic block requests */ |
539 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
540 | int cmd, int data) |
541 | { |
542 | struct request *rq; |
543 | int err; |
544 | |
545 | rq = blk_get_request(q, WRITE, __GFP_WAIT); |
546 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
547 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
548 | rq->cmd[0] = cmd; |
549 | rq->cmd[4] = data; |
550 | rq->cmd_len = 6; |
551 | err = blk_execute_rq(q, bd_disk, rq, 0); |
552 | blk_put_request(rq); |
553 | |
554 | return err; |
555 | } |
556 | |
557 | static inline int blk_send_start_stop(struct request_queue *q, |
558 | struct gendisk *bd_disk, int data) |
559 | { |
560 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); |
561 | } |
562 | |
563 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
564 | unsigned int cmd, void __user *arg) |
565 | { |
566 | int err; |
567 | |
568 | if (!q || blk_get_queue(q)) |
569 | return -ENXIO; |
570 | |
571 | switch (cmd) { |
572 | /* |
573 | * new sgv3 interface |
574 | */ |
575 | case SG_GET_VERSION_NUM: |
576 | err = sg_get_version(arg); |
577 | break; |
578 | case SCSI_IOCTL_GET_IDLUN: |
579 | err = scsi_get_idlun(q, arg); |
580 | break; |
581 | case SCSI_IOCTL_GET_BUS_NUMBER: |
582 | err = scsi_get_bus(q, arg); |
583 | break; |
584 | case SG_SET_TIMEOUT: |
585 | err = sg_set_timeout(q, arg); |
586 | break; |
587 | case SG_GET_TIMEOUT: |
588 | err = sg_get_timeout(q); |
589 | break; |
590 | case SG_GET_RESERVED_SIZE: |
591 | err = sg_get_reserved_size(q, arg); |
592 | break; |
593 | case SG_SET_RESERVED_SIZE: |
594 | err = sg_set_reserved_size(q, arg); |
595 | break; |
596 | case SG_EMULATED_HOST: |
597 | err = sg_emulated_host(q, arg); |
598 | break; |
599 | case SG_IO: { |
600 | struct sg_io_hdr hdr; |
601 | |
602 | err = -EFAULT; |
603 | if (copy_from_user(&hdr, arg, sizeof(hdr))) |
604 | break; |
605 | err = sg_io(q, bd_disk, &hdr, mode); |
606 | if (err == -EFAULT) |
607 | break; |
608 | |
609 | if (copy_to_user(arg, &hdr, sizeof(hdr))) |
610 | err = -EFAULT; |
611 | break; |
612 | } |
613 | case CDROM_SEND_PACKET: { |
614 | struct cdrom_generic_command cgc; |
615 | struct sg_io_hdr hdr; |
616 | |
617 | err = -EFAULT; |
618 | if (copy_from_user(&cgc, arg, sizeof(cgc))) |
619 | break; |
620 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); |
621 | memset(&hdr, 0, sizeof(hdr)); |
622 | hdr.interface_id = 'S'; |
623 | hdr.cmd_len = sizeof(cgc.cmd); |
624 | hdr.dxfer_len = cgc.buflen; |
625 | err = 0; |
626 | switch (cgc.data_direction) { |
627 | case CGC_DATA_UNKNOWN: |
628 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; |
629 | break; |
630 | case CGC_DATA_WRITE: |
631 | hdr.dxfer_direction = SG_DXFER_TO_DEV; |
632 | break; |
633 | case CGC_DATA_READ: |
634 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
635 | break; |
636 | case CGC_DATA_NONE: |
637 | hdr.dxfer_direction = SG_DXFER_NONE; |
638 | break; |
639 | default: |
640 | err = -EINVAL; |
641 | } |
642 | if (err) |
643 | break; |
644 | |
645 | hdr.dxferp = cgc.buffer; |
646 | hdr.sbp = cgc.sense; |
647 | if (hdr.sbp) |
648 | hdr.mx_sb_len = sizeof(struct request_sense); |
649 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
650 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
651 | hdr.cmd_len = sizeof(cgc.cmd); |
652 | |
653 | err = sg_io(q, bd_disk, &hdr, mode); |
654 | if (err == -EFAULT) |
655 | break; |
656 | |
657 | if (hdr.status) |
658 | err = -EIO; |
659 | |
660 | cgc.stat = err; |
661 | cgc.buflen = hdr.resid; |
662 | if (copy_to_user(arg, &cgc, sizeof(cgc))) |
663 | err = -EFAULT; |
664 | |
665 | break; |
666 | } |
667 | |
668 | /* |
669 | * old junk scsi send command ioctl |
670 | */ |
671 | case SCSI_IOCTL_SEND_COMMAND: |
672 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); |
673 | err = -EINVAL; |
674 | if (!arg) |
675 | break; |
676 | |
677 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
678 | break; |
679 | case CDROMCLOSETRAY: |
680 | err = blk_send_start_stop(q, bd_disk, 0x03); |
681 | break; |
682 | case CDROMEJECT: |
683 | err = blk_send_start_stop(q, bd_disk, 0x02); |
684 | break; |
685 | default: |
686 | err = -ENOTTY; |
687 | } |
688 | |
689 | blk_put_queue(q); |
690 | return err; |
691 | } |
692 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
693 | |
694 | static int __init blk_scsi_ioctl_init(void) |
695 | { |
696 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); |
697 | return 0; |
698 | } |
699 | fs_initcall(blk_scsi_ioctl_init); |
700 |
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v2.6.34-rc5
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