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1da177e4 LT |
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> | |
c59ede7b | 24 | #include <linux/capability.h> |
1da177e4 LT |
25 | #include <linux/completion.h> |
26 | #include <linux/cdrom.h> | |
0bfc96cb | 27 | #include <linux/ratelimit.h> |
1da177e4 LT |
28 | #include <linux/slab.h> |
29 | #include <linux/times.h> | |
a27bb332 | 30 | #include <linux/uio.h> |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
1f65a801 AW |
32 | #include <linux/fd.h> |
33 | #include <linux/raid/md_u.h> | |
34 | #include <linux/mtio.h> | |
1da177e4 LT |
35 | |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/scsi_ioctl.h> | |
38 | #include <scsi/scsi_cmnd.h> | |
39 | ||
018e0446 JA |
40 | struct blk_cmd_filter { |
41 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; | |
42 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
476d42f1 HS |
43 | }; |
44 | ||
45 | static struct blk_cmd_filter blk_default_cmd_filter; | |
018e0446 | 46 | |
1da177e4 | 47 | /* Command group 3 is reserved and should never be used. */ |
db4742dd | 48 | const unsigned char scsi_command_size_tbl[8] = |
1da177e4 LT |
49 | { |
50 | 6, 10, 10, 12, | |
51 | 16, 12, 10, 10 | |
52 | }; | |
db4742dd | 53 | EXPORT_SYMBOL(scsi_command_size_tbl); |
1da177e4 | 54 | |
1da177e4 LT |
55 | #include <scsi/sg.h> |
56 | ||
57 | static int sg_get_version(int __user *p) | |
58 | { | |
64100099 | 59 | static const int sg_version_num = 30527; |
1da177e4 LT |
60 | return put_user(sg_version_num, p); |
61 | } | |
62 | ||
165125e1 | 63 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
1da177e4 LT |
64 | { |
65 | return put_user(0, p); | |
66 | } | |
67 | ||
165125e1 | 68 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
1da177e4 LT |
69 | { |
70 | return put_user(0, p); | |
71 | } | |
72 | ||
165125e1 | 73 | static int sg_get_timeout(struct request_queue *q) |
1da177e4 | 74 | { |
2b91bafc | 75 | return jiffies_to_clock_t(q->sg_timeout); |
1da177e4 LT |
76 | } |
77 | ||
165125e1 | 78 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
1da177e4 LT |
79 | { |
80 | int timeout, err = get_user(timeout, p); | |
81 | ||
82 | if (!err) | |
2b91bafc | 83 | q->sg_timeout = clock_t_to_jiffies(timeout); |
1da177e4 LT |
84 | |
85 | return err; | |
86 | } | |
87 | ||
9b4231bf AM |
88 | static int max_sectors_bytes(struct request_queue *q) |
89 | { | |
90 | unsigned int max_sectors = queue_max_sectors(q); | |
91 | ||
92 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
93 | ||
94 | return max_sectors << 9; | |
95 | } | |
96 | ||
165125e1 | 97 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 | 98 | { |
9b4231bf | 99 | int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); |
44ec9542 AS |
100 | |
101 | return put_user(val, p); | |
1da177e4 LT |
102 | } |
103 | ||
165125e1 | 104 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 LT |
105 | { |
106 | int size, err = get_user(size, p); | |
107 | ||
108 | if (err) | |
109 | return err; | |
110 | ||
111 | if (size < 0) | |
112 | return -EINVAL; | |
1da177e4 | 113 | |
9b4231bf | 114 | q->sg_reserved_size = min(size, max_sectors_bytes(q)); |
1da177e4 LT |
115 | return 0; |
116 | } | |
117 | ||
118 | /* | |
119 | * will always return that we are ATAPI even for a real SCSI drive, I'm not | |
120 | * so sure this is worth doing anything about (why would you care??) | |
121 | */ | |
165125e1 | 122 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
1da177e4 LT |
123 | { |
124 | return put_user(1, p); | |
125 | } | |
126 | ||
018e0446 | 127 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
abf54393 FT |
128 | { |
129 | /* Basic read-only commands */ | |
130 | __set_bit(TEST_UNIT_READY, filter->read_ok); | |
131 | __set_bit(REQUEST_SENSE, filter->read_ok); | |
132 | __set_bit(READ_6, filter->read_ok); | |
133 | __set_bit(READ_10, filter->read_ok); | |
134 | __set_bit(READ_12, filter->read_ok); | |
135 | __set_bit(READ_16, filter->read_ok); | |
136 | __set_bit(READ_BUFFER, filter->read_ok); | |
137 | __set_bit(READ_DEFECT_DATA, filter->read_ok); | |
138 | __set_bit(READ_CAPACITY, filter->read_ok); | |
139 | __set_bit(READ_LONG, filter->read_ok); | |
140 | __set_bit(INQUIRY, filter->read_ok); | |
141 | __set_bit(MODE_SENSE, filter->read_ok); | |
142 | __set_bit(MODE_SENSE_10, filter->read_ok); | |
143 | __set_bit(LOG_SENSE, filter->read_ok); | |
144 | __set_bit(START_STOP, filter->read_ok); | |
145 | __set_bit(GPCMD_VERIFY_10, filter->read_ok); | |
146 | __set_bit(VERIFY_16, filter->read_ok); | |
147 | __set_bit(REPORT_LUNS, filter->read_ok); | |
eb846d9f | 148 | __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); |
abf54393 FT |
149 | __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); |
150 | __set_bit(MAINTENANCE_IN, filter->read_ok); | |
151 | __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); | |
152 | ||
153 | /* Audio CD commands */ | |
154 | __set_bit(GPCMD_PLAY_CD, filter->read_ok); | |
155 | __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); | |
156 | __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); | |
157 | __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); | |
158 | __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); | |
159 | ||
160 | /* CD/DVD data reading */ | |
161 | __set_bit(GPCMD_READ_CD, filter->read_ok); | |
162 | __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); | |
163 | __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); | |
164 | __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); | |
165 | __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); | |
166 | __set_bit(GPCMD_READ_HEADER, filter->read_ok); | |
167 | __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); | |
168 | __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); | |
169 | __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); | |
170 | __set_bit(GPCMD_REPORT_KEY, filter->read_ok); | |
171 | __set_bit(GPCMD_SCAN, filter->read_ok); | |
172 | __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); | |
173 | __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); | |
174 | __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); | |
175 | __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); | |
176 | __set_bit(GPCMD_SEEK, filter->read_ok); | |
177 | __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); | |
178 | ||
179 | /* Basic writing commands */ | |
180 | __set_bit(WRITE_6, filter->write_ok); | |
181 | __set_bit(WRITE_10, filter->write_ok); | |
182 | __set_bit(WRITE_VERIFY, filter->write_ok); | |
183 | __set_bit(WRITE_12, filter->write_ok); | |
184 | __set_bit(WRITE_VERIFY_12, filter->write_ok); | |
185 | __set_bit(WRITE_16, filter->write_ok); | |
186 | __set_bit(WRITE_LONG, filter->write_ok); | |
187 | __set_bit(WRITE_LONG_2, filter->write_ok); | |
25cdb645 MFO |
188 | __set_bit(WRITE_SAME, filter->write_ok); |
189 | __set_bit(WRITE_SAME_16, filter->write_ok); | |
190 | __set_bit(WRITE_SAME_32, filter->write_ok); | |
abf54393 FT |
191 | __set_bit(ERASE, filter->write_ok); |
192 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); | |
193 | __set_bit(MODE_SELECT, filter->write_ok); | |
194 | __set_bit(LOG_SELECT, filter->write_ok); | |
195 | __set_bit(GPCMD_BLANK, filter->write_ok); | |
196 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); | |
197 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); | |
198 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); | |
199 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); | |
200 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); | |
201 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); | |
202 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); | |
203 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); | |
204 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); | |
205 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); | |
206 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); | |
207 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); | |
208 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); | |
209 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); | |
35e396cd | 210 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
abf54393 | 211 | } |
018e0446 JA |
212 | |
213 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) | |
214 | { | |
215 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; | |
216 | ||
217 | /* root can do any command. */ | |
218 | if (capable(CAP_SYS_RAWIO)) | |
219 | return 0; | |
220 | ||
018e0446 JA |
221 | /* Anybody who can open the device can do a read-safe command */ |
222 | if (test_bit(cmd[0], filter->read_ok)) | |
223 | return 0; | |
224 | ||
225 | /* Write-safe commands require a writable open */ | |
226 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) | |
227 | return 0; | |
228 | ||
229 | return -EPERM; | |
230 | } | |
231 | EXPORT_SYMBOL(blk_verify_command); | |
abf54393 | 232 | |
165125e1 | 233 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
5842e51f | 234 | struct sg_io_hdr *hdr, fmode_t mode) |
3d6392cf | 235 | { |
3d6392cf JA |
236 | if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len)) |
237 | return -EFAULT; | |
018e0446 | 238 | if (blk_verify_command(rq->cmd, mode & FMODE_WRITE)) |
3d6392cf JA |
239 | return -EPERM; |
240 | ||
241 | /* | |
242 | * fill in request structure | |
243 | */ | |
244 | rq->cmd_len = hdr->cmd_len; | |
3d6392cf | 245 | |
24bb8fb9 | 246 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
3d6392cf JA |
247 | if (!rq->timeout) |
248 | rq->timeout = q->sg_timeout; | |
249 | if (!rq->timeout) | |
250 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
251 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
252 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
3d6392cf JA |
253 | |
254 | return 0; | |
255 | } | |
3d6392cf | 256 | |
41e1703b FT |
257 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
258 | struct bio *bio) | |
3d6392cf | 259 | { |
91e463c8 | 260 | int r, ret = 0; |
3d6392cf JA |
261 | |
262 | /* | |
263 | * fill in all the output members | |
264 | */ | |
265 | hdr->status = rq->errors & 0xff; | |
266 | hdr->masked_status = status_byte(rq->errors); | |
267 | hdr->msg_status = msg_byte(rq->errors); | |
268 | hdr->host_status = host_byte(rq->errors); | |
269 | hdr->driver_status = driver_byte(rq->errors); | |
270 | hdr->info = 0; | |
271 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) | |
272 | hdr->info |= SG_INFO_CHECK; | |
c3a4d78c | 273 | hdr->resid = rq->resid_len; |
3d6392cf JA |
274 | hdr->sb_len_wr = 0; |
275 | ||
276 | if (rq->sense_len && hdr->sbp) { | |
277 | int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len); | |
278 | ||
279 | if (!copy_to_user(hdr->sbp, rq->sense, len)) | |
280 | hdr->sb_len_wr = len; | |
281 | else | |
282 | ret = -EFAULT; | |
283 | } | |
284 | ||
91e463c8 FT |
285 | r = blk_rq_unmap_user(bio); |
286 | if (!ret) | |
287 | ret = r; | |
3d6392cf | 288 | |
1cd96c24 | 289 | return ret; |
3d6392cf | 290 | } |
3d6392cf | 291 | |
5842e51f AV |
292 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
293 | struct sg_io_hdr *hdr, fmode_t mode) | |
1da177e4 | 294 | { |
3d6392cf | 295 | unsigned long start_time; |
e0ce0eac KO |
296 | ssize_t ret = 0; |
297 | int writing = 0; | |
d1515613 | 298 | int at_head = 0; |
1da177e4 | 299 | struct request *rq; |
1da177e4 | 300 | char sense[SCSI_SENSE_BUFFERSIZE]; |
77d172ce | 301 | struct bio *bio; |
1da177e4 LT |
302 | |
303 | if (hdr->interface_id != 'S') | |
304 | return -EINVAL; | |
1da177e4 | 305 | |
ae03bf63 | 306 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
1da177e4 LT |
307 | return -EIO; |
308 | ||
f1970baf | 309 | if (hdr->dxfer_len) |
1da177e4 LT |
310 | switch (hdr->dxfer_direction) { |
311 | default: | |
312 | return -EINVAL; | |
1da177e4 LT |
313 | case SG_DXFER_TO_DEV: |
314 | writing = 1; | |
315 | break; | |
616e8a09 | 316 | case SG_DXFER_TO_FROM_DEV: |
1da177e4 | 317 | case SG_DXFER_FROM_DEV: |
1da177e4 LT |
318 | break; |
319 | } | |
d1515613 DG |
320 | if (hdr->flags & SG_FLAG_Q_AT_HEAD) |
321 | at_head = 1; | |
1da177e4 | 322 | |
a57821ca | 323 | ret = -ENOMEM; |
dd1cab95 | 324 | rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL); |
a492f075 JL |
325 | if (IS_ERR(rq)) |
326 | return PTR_ERR(rq); | |
f27b087b | 327 | blk_rq_set_block_pc(rq); |
1da177e4 | 328 | |
a57821ca CH |
329 | if (hdr->cmd_len > BLK_MAX_CDB) { |
330 | rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); | |
331 | if (!rq->cmd) | |
332 | goto out_put_request; | |
3d6392cf | 333 | } |
1da177e4 | 334 | |
2c4cffe8 PB |
335 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
336 | if (ret < 0) | |
a57821ca | 337 | goto out_free_cdb; |
1da177e4 | 338 | |
d19d7446 | 339 | ret = 0; |
0e75f906 | 340 | if (hdr->iovec_count) { |
26e49cfc | 341 | struct iov_iter i; |
17a05cca | 342 | struct iovec *iov = NULL; |
0e75f906 | 343 | |
e272b89f AV |
344 | ret = import_iovec(rq_data_dir(rq), |
345 | hdr->dxferp, hdr->iovec_count, | |
346 | 0, &iov, &i); | |
347 | if (ret < 0) | |
a57821ca | 348 | goto out_free_cdb; |
0e75f906 | 349 | |
25636e28 | 350 | /* SG_IO howto says that the shorter of the two wins */ |
e272b89f | 351 | iov_iter_truncate(&i, hdr->dxfer_len); |
25636e28 | 352 | |
26e49cfc | 353 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
e0ce0eac | 354 | kfree(iov); |
0e75f906 | 355 | } else if (hdr->dxfer_len) |
152e283f | 356 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
a3bce90e | 357 | GFP_KERNEL); |
0e75f906 MC |
358 | |
359 | if (ret) | |
a57821ca | 360 | goto out_free_cdb; |
0e75f906 | 361 | |
77d172ce | 362 | bio = rq->bio; |
3d6392cf JA |
363 | memset(sense, 0, sizeof(sense)); |
364 | rq->sense = sense; | |
365 | rq->sense_len = 0; | |
01840f9c JA |
366 | rq->retries = 0; |
367 | ||
1da177e4 LT |
368 | start_time = jiffies; |
369 | ||
370 | /* ignore return value. All information is passed back to caller | |
371 | * (if he doesn't check that is his problem). | |
372 | * N.B. a non-zero SCSI status is _not_ necessarily an error. | |
373 | */ | |
d1515613 | 374 | blk_execute_rq(q, bd_disk, rq, at_head); |
1da177e4 | 375 | |
24bb8fb9 | 376 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
1da177e4 | 377 | |
2cada584 | 378 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
a57821ca CH |
379 | |
380 | out_free_cdb: | |
381 | if (rq->cmd != rq->__cmd) | |
382 | kfree(rq->cmd); | |
383 | out_put_request: | |
dd1cab95 JA |
384 | blk_put_request(rq); |
385 | return ret; | |
1da177e4 LT |
386 | } |
387 | ||
21b2f0c8 CH |
388 | /** |
389 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl | |
390 | * @file: file this ioctl operates on (optional) | |
391 | * @q: request queue to send scsi commands down | |
392 | * @disk: gendisk to operate on (option) | |
393 | * @sic: userspace structure describing the command to perform | |
394 | * | |
395 | * Send down the scsi command described by @sic to the device below | |
396 | * the request queue @q. If @file is non-NULL it's used to perform | |
397 | * fine-grained permission checks that allow users to send down | |
398 | * non-destructive SCSI commands. If the caller has a struct gendisk | |
399 | * available it should be passed in as @disk to allow the low level | |
400 | * driver to use the information contained in it. A non-NULL @disk | |
401 | * is only allowed if the caller knows that the low level driver doesn't | |
402 | * need it (e.g. in the scsi subsystem). | |
403 | * | |
404 | * Notes: | |
405 | * - This interface is deprecated - users should use the SG_IO | |
406 | * interface instead, as this is a more flexible approach to | |
407 | * performing SCSI commands on a device. | |
408 | * - The SCSI command length is determined by examining the 1st byte | |
409 | * of the given command. There is no way to override this. | |
410 | * - Data transfers are limited to PAGE_SIZE | |
411 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to | |
412 | * accommodate the sense buffer when an error occurs. | |
413 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that | |
414 | * old code will not be surprised. | |
415 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive | |
416 | * a negative return and the Unix error code in 'errno'. | |
417 | * If the SCSI command succeeds then 0 is returned. | |
418 | * Positive numbers returned are the compacted SCSI error codes (4 | |
419 | * bytes in one int) where the lowest byte is the SCSI status. | |
420 | */ | |
1da177e4 | 421 | #define OMAX_SB_LEN 16 /* For backward compatibility */ |
e915e872 AV |
422 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
423 | struct scsi_ioctl_command __user *sic) | |
1da177e4 LT |
424 | { |
425 | struct request *rq; | |
aeb5d727 | 426 | int err; |
1da177e4 LT |
427 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
428 | char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE]; | |
429 | ||
21b2f0c8 CH |
430 | if (!sic) |
431 | return -EINVAL; | |
432 | ||
1da177e4 LT |
433 | /* |
434 | * get in an out lengths, verify they don't exceed a page worth of data | |
435 | */ | |
436 | if (get_user(in_len, &sic->inlen)) | |
437 | return -EFAULT; | |
438 | if (get_user(out_len, &sic->outlen)) | |
439 | return -EFAULT; | |
440 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) | |
441 | return -EINVAL; | |
442 | if (get_user(opcode, sic->data)) | |
443 | return -EFAULT; | |
444 | ||
445 | bytes = max(in_len, out_len); | |
446 | if (bytes) { | |
dd00cc48 | 447 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
1da177e4 LT |
448 | if (!buffer) |
449 | return -ENOMEM; | |
450 | ||
1da177e4 LT |
451 | } |
452 | ||
71baba4b | 453 | rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_RECLAIM); |
a492f075 JL |
454 | if (IS_ERR(rq)) { |
455 | err = PTR_ERR(rq); | |
92697dc9 | 456 | goto error_free_buffer; |
eb571eea | 457 | } |
2ba136da | 458 | blk_rq_set_block_pc(rq); |
1da177e4 LT |
459 | |
460 | cmdlen = COMMAND_SIZE(opcode); | |
461 | ||
462 | /* | |
463 | * get command and data to send to device, if any | |
464 | */ | |
465 | err = -EFAULT; | |
466 | rq->cmd_len = cmdlen; | |
467 | if (copy_from_user(rq->cmd, sic->data, cmdlen)) | |
468 | goto error; | |
469 | ||
21b2f0c8 | 470 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
1da177e4 LT |
471 | goto error; |
472 | ||
018e0446 | 473 | err = blk_verify_command(rq->cmd, mode & FMODE_WRITE); |
1da177e4 LT |
474 | if (err) |
475 | goto error; | |
476 | ||
21b2f0c8 CH |
477 | /* default. possible overriden later */ |
478 | rq->retries = 5; | |
479 | ||
1da177e4 | 480 | switch (opcode) { |
21b2f0c8 CH |
481 | case SEND_DIAGNOSTIC: |
482 | case FORMAT_UNIT: | |
483 | rq->timeout = FORMAT_UNIT_TIMEOUT; | |
484 | rq->retries = 1; | |
485 | break; | |
486 | case START_STOP: | |
487 | rq->timeout = START_STOP_TIMEOUT; | |
488 | break; | |
489 | case MOVE_MEDIUM: | |
490 | rq->timeout = MOVE_MEDIUM_TIMEOUT; | |
491 | break; | |
492 | case READ_ELEMENT_STATUS: | |
493 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; | |
494 | break; | |
495 | case READ_DEFECT_DATA: | |
496 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; | |
497 | rq->retries = 1; | |
498 | break; | |
499 | default: | |
3d6392cf | 500 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
21b2f0c8 CH |
501 | break; |
502 | } | |
503 | ||
71baba4b | 504 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) { |
21b2f0c8 | 505 | err = DRIVER_ERROR << 24; |
84ce0f0e | 506 | goto error; |
1da177e4 LT |
507 | } |
508 | ||
509 | memset(sense, 0, sizeof(sense)); | |
510 | rq->sense = sense; | |
511 | rq->sense_len = 0; | |
1da177e4 | 512 | |
21b2f0c8 CH |
513 | blk_execute_rq(q, disk, rq, 0); |
514 | ||
1da177e4 LT |
515 | err = rq->errors & 0xff; /* only 8 bit SCSI status */ |
516 | if (err) { | |
517 | if (rq->sense_len && rq->sense) { | |
518 | bytes = (OMAX_SB_LEN > rq->sense_len) ? | |
519 | rq->sense_len : OMAX_SB_LEN; | |
520 | if (copy_to_user(sic->data, rq->sense, bytes)) | |
521 | err = -EFAULT; | |
522 | } | |
523 | } else { | |
524 | if (copy_to_user(sic->data, buffer, out_len)) | |
525 | err = -EFAULT; | |
526 | } | |
527 | ||
528 | error: | |
92697dc9 TB |
529 | blk_put_request(rq); |
530 | ||
531 | error_free_buffer: | |
eb571eea | 532 | kfree(buffer); |
92697dc9 | 533 | |
1da177e4 LT |
534 | return err; |
535 | } | |
21b2f0c8 | 536 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
f98d2dfd BC |
537 | |
538 | /* Send basic block requests */ | |
165125e1 JA |
539 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
540 | int cmd, int data) | |
f98d2dfd BC |
541 | { |
542 | struct request *rq; | |
543 | int err; | |
544 | ||
71baba4b | 545 | rq = blk_get_request(q, WRITE, __GFP_RECLAIM); |
a492f075 JL |
546 | if (IS_ERR(rq)) |
547 | return PTR_ERR(rq); | |
f27b087b | 548 | blk_rq_set_block_pc(rq); |
3d6392cf | 549 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
f98d2dfd BC |
550 | rq->cmd[0] = cmd; |
551 | rq->cmd[4] = data; | |
552 | rq->cmd_len = 6; | |
553 | err = blk_execute_rq(q, bd_disk, rq, 0); | |
554 | blk_put_request(rq); | |
555 | ||
556 | return err; | |
557 | } | |
558 | ||
165125e1 JA |
559 | static inline int blk_send_start_stop(struct request_queue *q, |
560 | struct gendisk *bd_disk, int data) | |
f98d2dfd BC |
561 | { |
562 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); | |
563 | } | |
564 | ||
74f3c8af AV |
565 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
566 | unsigned int cmd, void __user *arg) | |
1da177e4 | 567 | { |
f98d2dfd | 568 | int err; |
1da177e4 | 569 | |
315fceee | 570 | if (!q) |
1da177e4 LT |
571 | return -ENXIO; |
572 | ||
573 | switch (cmd) { | |
574 | /* | |
575 | * new sgv3 interface | |
576 | */ | |
577 | case SG_GET_VERSION_NUM: | |
578 | err = sg_get_version(arg); | |
579 | break; | |
580 | case SCSI_IOCTL_GET_IDLUN: | |
581 | err = scsi_get_idlun(q, arg); | |
582 | break; | |
583 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
584 | err = scsi_get_bus(q, arg); | |
585 | break; | |
586 | case SG_SET_TIMEOUT: | |
587 | err = sg_set_timeout(q, arg); | |
588 | break; | |
589 | case SG_GET_TIMEOUT: | |
590 | err = sg_get_timeout(q); | |
591 | break; | |
592 | case SG_GET_RESERVED_SIZE: | |
593 | err = sg_get_reserved_size(q, arg); | |
594 | break; | |
595 | case SG_SET_RESERVED_SIZE: | |
596 | err = sg_set_reserved_size(q, arg); | |
597 | break; | |
598 | case SG_EMULATED_HOST: | |
599 | err = sg_emulated_host(q, arg); | |
600 | break; | |
601 | case SG_IO: { | |
602 | struct sg_io_hdr hdr; | |
603 | ||
604 | err = -EFAULT; | |
605 | if (copy_from_user(&hdr, arg, sizeof(hdr))) | |
606 | break; | |
74f3c8af | 607 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
608 | if (err == -EFAULT) |
609 | break; | |
610 | ||
611 | if (copy_to_user(arg, &hdr, sizeof(hdr))) | |
612 | err = -EFAULT; | |
613 | break; | |
614 | } | |
615 | case CDROM_SEND_PACKET: { | |
616 | struct cdrom_generic_command cgc; | |
617 | struct sg_io_hdr hdr; | |
618 | ||
619 | err = -EFAULT; | |
620 | if (copy_from_user(&cgc, arg, sizeof(cgc))) | |
621 | break; | |
622 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); | |
623 | memset(&hdr, 0, sizeof(hdr)); | |
624 | hdr.interface_id = 'S'; | |
625 | hdr.cmd_len = sizeof(cgc.cmd); | |
626 | hdr.dxfer_len = cgc.buflen; | |
627 | err = 0; | |
628 | switch (cgc.data_direction) { | |
629 | case CGC_DATA_UNKNOWN: | |
630 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; | |
631 | break; | |
632 | case CGC_DATA_WRITE: | |
633 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
634 | break; | |
635 | case CGC_DATA_READ: | |
636 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
637 | break; | |
638 | case CGC_DATA_NONE: | |
639 | hdr.dxfer_direction = SG_DXFER_NONE; | |
640 | break; | |
641 | default: | |
642 | err = -EINVAL; | |
643 | } | |
644 | if (err) | |
645 | break; | |
646 | ||
647 | hdr.dxferp = cgc.buffer; | |
648 | hdr.sbp = cgc.sense; | |
649 | if (hdr.sbp) | |
650 | hdr.mx_sb_len = sizeof(struct request_sense); | |
ad337591 | 651 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
1da177e4 LT |
652 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
653 | hdr.cmd_len = sizeof(cgc.cmd); | |
654 | ||
74f3c8af | 655 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
656 | if (err == -EFAULT) |
657 | break; | |
658 | ||
659 | if (hdr.status) | |
660 | err = -EIO; | |
661 | ||
662 | cgc.stat = err; | |
663 | cgc.buflen = hdr.resid; | |
664 | if (copy_to_user(arg, &cgc, sizeof(cgc))) | |
665 | err = -EFAULT; | |
666 | ||
667 | break; | |
668 | } | |
669 | ||
670 | /* | |
671 | * old junk scsi send command ioctl | |
672 | */ | |
673 | case SCSI_IOCTL_SEND_COMMAND: | |
674 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); | |
675 | err = -EINVAL; | |
676 | if (!arg) | |
677 | break; | |
678 | ||
74f3c8af | 679 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
1da177e4 LT |
680 | break; |
681 | case CDROMCLOSETRAY: | |
f98d2dfd BC |
682 | err = blk_send_start_stop(q, bd_disk, 0x03); |
683 | break; | |
1da177e4 | 684 | case CDROMEJECT: |
f98d2dfd | 685 | err = blk_send_start_stop(q, bd_disk, 0x02); |
1da177e4 LT |
686 | break; |
687 | default: | |
688 | err = -ENOTTY; | |
689 | } | |
690 | ||
1da177e4 LT |
691 | return err; |
692 | } | |
1da177e4 | 693 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
018e0446 | 694 | |
0bfc96cb PB |
695 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
696 | { | |
697 | if (bd && bd == bd->bd_contains) | |
698 | return 0; | |
699 | ||
700 | /* Actually none of these is particularly useful on a partition, | |
701 | * but they are safe. | |
702 | */ | |
703 | switch (cmd) { | |
704 | case SCSI_IOCTL_GET_IDLUN: | |
705 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
706 | case SCSI_IOCTL_GET_PCI: | |
707 | case SCSI_IOCTL_PROBE_HOST: | |
708 | case SG_GET_VERSION_NUM: | |
709 | case SG_SET_TIMEOUT: | |
710 | case SG_GET_TIMEOUT: | |
711 | case SG_GET_RESERVED_SIZE: | |
712 | case SG_SET_RESERVED_SIZE: | |
713 | case SG_EMULATED_HOST: | |
1f65a801 AW |
714 | case BLKFLSBUF: |
715 | case BLKROSET: | |
0bfc96cb PB |
716 | return 0; |
717 | case CDROM_GET_CAPABILITY: | |
1f65a801 AW |
718 | case CDROM_DRIVE_STATUS: |
719 | case FDGETPRM: | |
720 | case RAID_VERSION: | |
721 | case MTIOCGET: | |
722 | #ifdef CONFIG_COMPAT | |
723 | case 0x801c6d02: /* MTIOCGET32 */ | |
724 | #endif | |
0bfc96cb PB |
725 | /* Keep this until we remove the printk below. udev sends it |
726 | * and we do not want to spam dmesg about it. CD-ROMs do | |
727 | * not have partitions, so we get here only for disks. | |
728 | */ | |
729 | return -ENOIOCTLCMD; | |
730 | default: | |
731 | break; | |
732 | } | |
733 | ||
6d935928 JK |
734 | if (capable(CAP_SYS_RAWIO)) |
735 | return 0; | |
736 | ||
0bfc96cb PB |
737 | /* In particular, rule out all resets and host-specific ioctls. */ |
738 | printk_ratelimited(KERN_WARNING | |
739 | "%s: sending ioctl %x to a partition!\n", current->comm, cmd); | |
740 | ||
6d935928 | 741 | return -ENOIOCTLCMD; |
0bfc96cb PB |
742 | } |
743 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); | |
744 | ||
577ebb37 PB |
745 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
746 | unsigned int cmd, void __user *arg) | |
747 | { | |
0bfc96cb PB |
748 | int ret; |
749 | ||
750 | ret = scsi_verify_blk_ioctl(bd, cmd); | |
751 | if (ret < 0) | |
752 | return ret; | |
753 | ||
577ebb37 PB |
754 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
755 | } | |
756 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); | |
757 | ||
476d42f1 | 758 | static int __init blk_scsi_ioctl_init(void) |
018e0446 JA |
759 | { |
760 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); | |
761 | return 0; | |
762 | } | |
76da0346 | 763 | fs_initcall(blk_scsi_ioctl_init); |