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