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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 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, 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(ERASE, filter->write_ok); | |
186 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); | |
187 | __set_bit(MODE_SELECT, filter->write_ok); | |
188 | __set_bit(LOG_SELECT, filter->write_ok); | |
189 | __set_bit(GPCMD_BLANK, filter->write_ok); | |
190 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); | |
191 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); | |
192 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); | |
193 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); | |
194 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); | |
195 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); | |
196 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); | |
197 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); | |
198 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); | |
199 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); | |
200 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); | |
201 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); | |
202 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); | |
203 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); | |
204 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); | |
205 | } | |
206 | ||
207 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) | |
208 | { | |
209 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; | |
210 | ||
211 | /* root can do any command. */ | |
212 | if (capable(CAP_SYS_RAWIO)) | |
213 | return 0; | |
214 | ||
215 | /* Anybody who can open the device can do a read-safe command */ | |
216 | if (test_bit(cmd[0], filter->read_ok)) | |
217 | return 0; | |
218 | ||
219 | /* Write-safe commands require a writable open */ | |
220 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) | |
221 | return 0; | |
222 | ||
223 | return -EPERM; | |
224 | } | |
225 | EXPORT_SYMBOL(blk_verify_command); | |
226 | ||
227 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, | |
228 | struct sg_io_hdr *hdr, fmode_t mode) | |
229 | { | |
230 | if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) | |
231 | return -EFAULT; | |
232 | if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) | |
233 | return -EPERM; | |
234 | ||
235 | /* | |
236 | * fill in request structure | |
237 | */ | |
238 | rq->cmd_len = hdr->cmd_len; | |
239 | ||
240 | rq->timeout = msecs_to_jiffies(hdr->timeout); | |
241 | if (!rq->timeout) | |
242 | rq->timeout = q->sg_timeout; | |
243 | if (!rq->timeout) | |
244 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
245 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) | |
246 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, | |
252 | struct bio *bio) | |
253 | { | |
254 | int r, ret = 0; | |
255 | ||
256 | /* | |
257 | * fill in all the output members | |
258 | */ | |
259 | hdr->status = rq->errors & 0xff; | |
260 | hdr->masked_status = status_byte(rq->errors); | |
261 | hdr->msg_status = msg_byte(rq->errors); | |
262 | hdr->host_status = host_byte(rq->errors); | |
263 | hdr->driver_status = driver_byte(rq->errors); | |
264 | hdr->info = 0; | |
265 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) | |
266 | hdr->info |= SG_INFO_CHECK; | |
267 | hdr->resid = rq->resid_len; | |
268 | hdr->sb_len_wr = 0; | |
269 | ||
270 | if (rq->sense_len && hdr->sbp) { | |
271 | int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); | |
272 | ||
273 | if (!copy_to_user(hdr->sbp, rq->sense, len)) | |
274 | hdr->sb_len_wr = len; | |
275 | else | |
276 | ret = -EFAULT; | |
277 | } | |
278 | ||
279 | r = blk_rq_unmap_user(bio); | |
280 | if (!ret) | |
281 | ret = r; | |
282 | blk_put_request(rq); | |
283 | ||
284 | return ret; | |
285 | } | |
286 | ||
287 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, | |
288 | struct sg_io_hdr *hdr, fmode_t mode) | |
289 | { | |
290 | unsigned long start_time; | |
291 | ssize_t ret = 0; | |
292 | int writing = 0; | |
293 | int at_head = 0; | |
294 | struct request *rq; | |
295 | char sense[SCSI_SENSE_BUFFERSIZE]; | |
296 | struct bio *bio; | |
297 | ||
298 | if (hdr->interface_id != 'S') | |
299 | return -EINVAL; | |
300 | if (hdr->cmd_len > BLK_MAX_CDB) | |
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 | rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); | |
321 | if (!rq) | |
322 | return -ENOMEM; | |
323 | blk_rq_set_block_pc(rq); | |
324 | ||
325 | if (blk_fill_sghdr_rq(q, rq, hdr, mode)) { | |
326 | blk_put_request(rq); | |
327 | return -EFAULT; | |
328 | } | |
329 | ||
330 | if (hdr->iovec_count) { | |
331 | size_t iov_data_len; | |
332 | struct iovec *iov = NULL; | |
333 | ||
334 | ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count, | |
335 | 0, NULL, &iov); | |
336 | if (ret < 0) { | |
337 | kfree(iov); | |
338 | goto out; | |
339 | } | |
340 | ||
341 | iov_data_len = ret; | |
342 | ret = 0; | |
343 | ||
344 | /* SG_IO howto says that the shorter of the two wins */ | |
345 | if (hdr->dxfer_len < iov_data_len) { | |
346 | hdr->iovec_count = iov_shorten(iov, | |
347 | hdr->iovec_count, | |
348 | hdr->dxfer_len); | |
349 | iov_data_len = hdr->dxfer_len; | |
350 | } | |
351 | ||
352 | ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov, | |
353 | hdr->iovec_count, | |
354 | iov_data_len, GFP_KERNEL); | |
355 | kfree(iov); | |
356 | } else if (hdr->dxfer_len) | |
357 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, | |
358 | GFP_KERNEL); | |
359 | ||
360 | if (ret) | |
361 | goto out; | |
362 | ||
363 | bio = rq->bio; | |
364 | memset(sense, 0, sizeof(sense)); | |
365 | rq->sense = sense; | |
366 | rq->sense_len = 0; | |
367 | rq->retries = 0; | |
368 | ||
369 | start_time = jiffies; | |
370 | ||
371 | /* ignore return value. All information is passed back to caller | |
372 | * (if he doesn't check that is his problem). | |
373 | * N.B. a non-zero SCSI status is _not_ necessarily an error. | |
374 | */ | |
375 | blk_execute_rq(q, bd_disk, rq, at_head); | |
376 | ||
377 | hdr->duration = jiffies_to_msecs(jiffies - start_time); | |
378 | ||
379 | return blk_complete_sghdr_rq(rq, hdr, bio); | |
380 | out: | |
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_WAIT); | |
451 | ||
452 | cmdlen = COMMAND_SIZE(opcode); | |
453 | ||
454 | /* | |
455 | * get command and data to send to device, if any | |
456 | */ | |
457 | err = -EFAULT; | |
458 | rq->cmd_len = cmdlen; | |
459 | if (copy_from_user(rq->cmd, sic->data, cmdlen)) | |
460 | goto error; | |
461 | ||
462 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) | |
463 | goto error; | |
464 | ||
465 | err = blk_verify_command(rq->cmd, mode & FMODE_WRITE); | |
466 | if (err) | |
467 | goto error; | |
468 | ||
469 | /* default. possible overriden later */ | |
470 | rq->retries = 5; | |
471 | ||
472 | switch (opcode) { | |
473 | case SEND_DIAGNOSTIC: | |
474 | case FORMAT_UNIT: | |
475 | rq->timeout = FORMAT_UNIT_TIMEOUT; | |
476 | rq->retries = 1; | |
477 | break; | |
478 | case START_STOP: | |
479 | rq->timeout = START_STOP_TIMEOUT; | |
480 | break; | |
481 | case MOVE_MEDIUM: | |
482 | rq->timeout = MOVE_MEDIUM_TIMEOUT; | |
483 | break; | |
484 | case READ_ELEMENT_STATUS: | |
485 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; | |
486 | break; | |
487 | case READ_DEFECT_DATA: | |
488 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; | |
489 | rq->retries = 1; | |
490 | break; | |
491 | default: | |
492 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
493 | break; | |
494 | } | |
495 | ||
496 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) { | |
497 | err = DRIVER_ERROR << 24; | |
498 | goto out; | |
499 | } | |
500 | ||
501 | memset(sense, 0, sizeof(sense)); | |
502 | rq->sense = sense; | |
503 | rq->sense_len = 0; | |
504 | blk_rq_set_block_pc(rq); | |
505 | ||
506 | blk_execute_rq(q, disk, rq, 0); | |
507 | ||
508 | out: | |
509 | err = rq->errors & 0xff; /* only 8 bit SCSI status */ | |
510 | if (err) { | |
511 | if (rq->sense_len && rq->sense) { | |
512 | bytes = (OMAX_SB_LEN > rq->sense_len) ? | |
513 | rq->sense_len : OMAX_SB_LEN; | |
514 | if (copy_to_user(sic->data, rq->sense, bytes)) | |
515 | err = -EFAULT; | |
516 | } | |
517 | } else { | |
518 | if (copy_to_user(sic->data, buffer, out_len)) | |
519 | err = -EFAULT; | |
520 | } | |
521 | ||
522 | error: | |
523 | kfree(buffer); | |
524 | blk_put_request(rq); | |
525 | return err; | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); | |
528 | ||
529 | /* Send basic block requests */ | |
530 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, | |
531 | int cmd, int data) | |
532 | { | |
533 | struct request *rq; | |
534 | int err; | |
535 | ||
536 | rq = blk_get_request(q, WRITE, __GFP_WAIT); | |
537 | blk_rq_set_block_pc(rq); | |
538 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
539 | rq->cmd[0] = cmd; | |
540 | rq->cmd[4] = data; | |
541 | rq->cmd_len = 6; | |
542 | err = blk_execute_rq(q, bd_disk, rq, 0); | |
543 | blk_put_request(rq); | |
544 | ||
545 | return err; | |
546 | } | |
547 | ||
548 | static inline int blk_send_start_stop(struct request_queue *q, | |
549 | struct gendisk *bd_disk, int data) | |
550 | { | |
551 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); | |
552 | } | |
553 | ||
554 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, | |
555 | unsigned int cmd, void __user *arg) | |
556 | { | |
557 | int err; | |
558 | ||
559 | if (!q) | |
560 | return -ENXIO; | |
561 | ||
562 | switch (cmd) { | |
563 | /* | |
564 | * new sgv3 interface | |
565 | */ | |
566 | case SG_GET_VERSION_NUM: | |
567 | err = sg_get_version(arg); | |
568 | break; | |
569 | case SCSI_IOCTL_GET_IDLUN: | |
570 | err = scsi_get_idlun(q, arg); | |
571 | break; | |
572 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
573 | err = scsi_get_bus(q, arg); | |
574 | break; | |
575 | case SG_SET_TIMEOUT: | |
576 | err = sg_set_timeout(q, arg); | |
577 | break; | |
578 | case SG_GET_TIMEOUT: | |
579 | err = sg_get_timeout(q); | |
580 | break; | |
581 | case SG_GET_RESERVED_SIZE: | |
582 | err = sg_get_reserved_size(q, arg); | |
583 | break; | |
584 | case SG_SET_RESERVED_SIZE: | |
585 | err = sg_set_reserved_size(q, arg); | |
586 | break; | |
587 | case SG_EMULATED_HOST: | |
588 | err = sg_emulated_host(q, arg); | |
589 | break; | |
590 | case SG_IO: { | |
591 | struct sg_io_hdr hdr; | |
592 | ||
593 | err = -EFAULT; | |
594 | if (copy_from_user(&hdr, arg, sizeof(hdr))) | |
595 | break; | |
596 | err = sg_io(q, bd_disk, &hdr, mode); | |
597 | if (err == -EFAULT) | |
598 | break; | |
599 | ||
600 | if (copy_to_user(arg, &hdr, sizeof(hdr))) | |
601 | err = -EFAULT; | |
602 | break; | |
603 | } | |
604 | case CDROM_SEND_PACKET: { | |
605 | struct cdrom_generic_command cgc; | |
606 | struct sg_io_hdr hdr; | |
607 | ||
608 | err = -EFAULT; | |
609 | if (copy_from_user(&cgc, arg, sizeof(cgc))) | |
610 | break; | |
611 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); | |
612 | memset(&hdr, 0, sizeof(hdr)); | |
613 | hdr.interface_id = 'S'; | |
614 | hdr.cmd_len = sizeof(cgc.cmd); | |
615 | hdr.dxfer_len = cgc.buflen; | |
616 | err = 0; | |
617 | switch (cgc.data_direction) { | |
618 | case CGC_DATA_UNKNOWN: | |
619 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; | |
620 | break; | |
621 | case CGC_DATA_WRITE: | |
622 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
623 | break; | |
624 | case CGC_DATA_READ: | |
625 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
626 | break; | |
627 | case CGC_DATA_NONE: | |
628 | hdr.dxfer_direction = SG_DXFER_NONE; | |
629 | break; | |
630 | default: | |
631 | err = -EINVAL; | |
632 | } | |
633 | if (err) | |
634 | break; | |
635 | ||
636 | hdr.dxferp = cgc.buffer; | |
637 | hdr.sbp = cgc.sense; | |
638 | if (hdr.sbp) | |
639 | hdr.mx_sb_len = sizeof(struct request_sense); | |
640 | hdr.timeout = jiffies_to_msecs(cgc.timeout); | |
641 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; | |
642 | hdr.cmd_len = sizeof(cgc.cmd); | |
643 | ||
644 | err = sg_io(q, bd_disk, &hdr, mode); | |
645 | if (err == -EFAULT) | |
646 | break; | |
647 | ||
648 | if (hdr.status) | |
649 | err = -EIO; | |
650 | ||
651 | cgc.stat = err; | |
652 | cgc.buflen = hdr.resid; | |
653 | if (copy_to_user(arg, &cgc, sizeof(cgc))) | |
654 | err = -EFAULT; | |
655 | ||
656 | break; | |
657 | } | |
658 | ||
659 | /* | |
660 | * old junk scsi send command ioctl | |
661 | */ | |
662 | case SCSI_IOCTL_SEND_COMMAND: | |
663 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); | |
664 | err = -EINVAL; | |
665 | if (!arg) | |
666 | break; | |
667 | ||
668 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); | |
669 | break; | |
670 | case CDROMCLOSETRAY: | |
671 | err = blk_send_start_stop(q, bd_disk, 0x03); | |
672 | break; | |
673 | case CDROMEJECT: | |
674 | err = blk_send_start_stop(q, bd_disk, 0x02); | |
675 | break; | |
676 | default: | |
677 | err = -ENOTTY; | |
678 | } | |
679 | ||
680 | return err; | |
681 | } | |
682 | EXPORT_SYMBOL(scsi_cmd_ioctl); | |
683 | ||
684 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) | |
685 | { | |
686 | if (bd && bd == bd->bd_contains) | |
687 | return 0; | |
688 | ||
689 | /* Actually none of these is particularly useful on a partition, | |
690 | * but they are safe. | |
691 | */ | |
692 | switch (cmd) { | |
693 | case SCSI_IOCTL_GET_IDLUN: | |
694 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
695 | case SCSI_IOCTL_GET_PCI: | |
696 | case SCSI_IOCTL_PROBE_HOST: | |
697 | case SG_GET_VERSION_NUM: | |
698 | case SG_SET_TIMEOUT: | |
699 | case SG_GET_TIMEOUT: | |
700 | case SG_GET_RESERVED_SIZE: | |
701 | case SG_SET_RESERVED_SIZE: | |
702 | case SG_EMULATED_HOST: | |
703 | return 0; | |
704 | case CDROM_GET_CAPABILITY: | |
705 | /* Keep this until we remove the printk below. udev sends it | |
706 | * and we do not want to spam dmesg about it. CD-ROMs do | |
707 | * not have partitions, so we get here only for disks. | |
708 | */ | |
709 | return -ENOIOCTLCMD; | |
710 | default: | |
711 | break; | |
712 | } | |
713 | ||
714 | if (capable(CAP_SYS_RAWIO)) | |
715 | return 0; | |
716 | ||
717 | /* In particular, rule out all resets and host-specific ioctls. */ | |
718 | printk_ratelimited(KERN_WARNING | |
719 | "%s: sending ioctl %x to a partition!\n", current->comm, cmd); | |
720 | ||
721 | return -ENOIOCTLCMD; | |
722 | } | |
723 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); | |
724 | ||
725 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, | |
726 | unsigned int cmd, void __user *arg) | |
727 | { | |
728 | int ret; | |
729 | ||
730 | ret = scsi_verify_blk_ioctl(bd, cmd); | |
731 | if (ret < 0) | |
732 | return ret; | |
733 | ||
734 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); | |
735 | } | |
736 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); | |
737 | ||
738 | static int __init blk_scsi_ioctl_init(void) | |
739 | { | |
740 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); | |
741 | return 0; | |
742 | } | |
743 | fs_initcall(blk_scsi_ioctl_init); |