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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); |