Commit | Line | Data |
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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> |
1da177e4 LT |
32 | |
33 | #include <scsi/scsi.h> | |
34 | #include <scsi/scsi_ioctl.h> | |
35 | #include <scsi/scsi_cmnd.h> | |
36 | ||
018e0446 JA |
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]; | |
476d42f1 HS |
40 | }; |
41 | ||
42 | static struct blk_cmd_filter blk_default_cmd_filter; | |
018e0446 | 43 | |
1da177e4 | 44 | /* Command group 3 is reserved and should never be used. */ |
db4742dd | 45 | const unsigned char scsi_command_size_tbl[8] = |
1da177e4 LT |
46 | { |
47 | 6, 10, 10, 12, | |
48 | 16, 12, 10, 10 | |
49 | }; | |
db4742dd | 50 | EXPORT_SYMBOL(scsi_command_size_tbl); |
1da177e4 | 51 | |
1da177e4 LT |
52 | #include <scsi/sg.h> |
53 | ||
54 | static int sg_get_version(int __user *p) | |
55 | { | |
64100099 | 56 | static const int sg_version_num = 30527; |
1da177e4 LT |
57 | return put_user(sg_version_num, p); |
58 | } | |
59 | ||
165125e1 | 60 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
1da177e4 LT |
61 | { |
62 | return put_user(0, p); | |
63 | } | |
64 | ||
165125e1 | 65 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
1da177e4 LT |
66 | { |
67 | return put_user(0, p); | |
68 | } | |
69 | ||
165125e1 | 70 | static int sg_get_timeout(struct request_queue *q) |
1da177e4 | 71 | { |
2b91bafc | 72 | return jiffies_to_clock_t(q->sg_timeout); |
1da177e4 LT |
73 | } |
74 | ||
165125e1 | 75 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
1da177e4 LT |
76 | { |
77 | int timeout, err = get_user(timeout, p); | |
78 | ||
79 | if (!err) | |
2b91bafc | 80 | q->sg_timeout = clock_t_to_jiffies(timeout); |
1da177e4 LT |
81 | |
82 | return err; | |
83 | } | |
84 | ||
9b4231bf AM |
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 | ||
165125e1 | 94 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 | 95 | { |
9b4231bf | 96 | int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); |
44ec9542 AS |
97 | |
98 | return put_user(val, p); | |
1da177e4 LT |
99 | } |
100 | ||
165125e1 | 101 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 LT |
102 | { |
103 | int size, err = get_user(size, p); | |
104 | ||
105 | if (err) | |
106 | return err; | |
107 | ||
108 | if (size < 0) | |
109 | return -EINVAL; | |
1da177e4 | 110 | |
9b4231bf | 111 | q->sg_reserved_size = min(size, max_sectors_bytes(q)); |
1da177e4 LT |
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 | */ | |
165125e1 | 119 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
1da177e4 LT |
120 | { |
121 | return put_user(1, p); | |
122 | } | |
123 | ||
018e0446 | 124 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
abf54393 FT |
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); | |
eb846d9f | 145 | __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); |
abf54393 FT |
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); | |
25cdb645 MFO |
185 | __set_bit(WRITE_SAME, filter->write_ok); |
186 | __set_bit(WRITE_SAME_16, filter->write_ok); | |
187 | __set_bit(WRITE_SAME_32, filter->write_ok); | |
abf54393 FT |
188 | __set_bit(ERASE, filter->write_ok); |
189 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); | |
190 | __set_bit(MODE_SELECT, filter->write_ok); | |
191 | __set_bit(LOG_SELECT, filter->write_ok); | |
192 | __set_bit(GPCMD_BLANK, filter->write_ok); | |
193 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); | |
194 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); | |
195 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); | |
196 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); | |
197 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); | |
198 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); | |
199 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); | |
200 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); | |
201 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); | |
202 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); | |
203 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); | |
204 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); | |
205 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); | |
206 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); | |
35e396cd | 207 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
abf54393 | 208 | } |
018e0446 JA |
209 | |
210 | int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) | |
211 | { | |
212 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; | |
213 | ||
214 | /* root can do any command. */ | |
215 | if (capable(CAP_SYS_RAWIO)) | |
216 | return 0; | |
217 | ||
018e0446 JA |
218 | /* Anybody who can open the device can do a read-safe command */ |
219 | if (test_bit(cmd[0], filter->read_ok)) | |
220 | return 0; | |
221 | ||
222 | /* Write-safe commands require a writable open */ | |
223 | if (test_bit(cmd[0], filter->write_ok) && has_write_perm) | |
224 | return 0; | |
225 | ||
226 | return -EPERM; | |
227 | } | |
228 | EXPORT_SYMBOL(blk_verify_command); | |
abf54393 | 229 | |
165125e1 | 230 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
5842e51f | 231 | struct sg_io_hdr *hdr, fmode_t mode) |
3d6392cf | 232 | { |
82ed4db4 CH |
233 | struct scsi_request *req = scsi_req(rq); |
234 | ||
235 | if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) | |
3d6392cf | 236 | return -EFAULT; |
82ed4db4 | 237 | if (blk_verify_command(req->cmd, mode & FMODE_WRITE)) |
3d6392cf JA |
238 | return -EPERM; |
239 | ||
240 | /* | |
241 | * fill in request structure | |
242 | */ | |
82ed4db4 | 243 | req->cmd_len = hdr->cmd_len; |
3d6392cf | 244 | |
24bb8fb9 | 245 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
3d6392cf JA |
246 | if (!rq->timeout) |
247 | rq->timeout = q->sg_timeout; | |
248 | if (!rq->timeout) | |
249 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
250 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
251 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
3d6392cf JA |
252 | |
253 | return 0; | |
254 | } | |
3d6392cf | 255 | |
41e1703b FT |
256 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
257 | struct bio *bio) | |
3d6392cf | 258 | { |
82ed4db4 | 259 | struct scsi_request *req = scsi_req(rq); |
91e463c8 | 260 | int r, ret = 0; |
3d6392cf JA |
261 | |
262 | /* | |
263 | * fill in all the output members | |
264 | */ | |
17d5363b CH |
265 | hdr->status = req->result & 0xff; |
266 | hdr->masked_status = status_byte(req->result); | |
267 | hdr->msg_status = msg_byte(req->result); | |
268 | hdr->host_status = host_byte(req->result); | |
269 | hdr->driver_status = driver_byte(req->result); | |
3d6392cf JA |
270 | hdr->info = 0; |
271 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) | |
272 | hdr->info |= SG_INFO_CHECK; | |
82ed4db4 | 273 | hdr->resid = req->resid_len; |
3d6392cf JA |
274 | hdr->sb_len_wr = 0; |
275 | ||
82ed4db4 CH |
276 | if (req->sense_len && hdr->sbp) { |
277 | int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); | |
3d6392cf | 278 | |
82ed4db4 | 279 | if (!copy_to_user(hdr->sbp, req->sense, len)) |
3d6392cf JA |
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; |
82ed4db4 | 300 | struct scsi_request *req; |
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; |
aebf526b CH |
324 | rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, |
325 | GFP_KERNEL); | |
a492f075 JL |
326 | if (IS_ERR(rq)) |
327 | return PTR_ERR(rq); | |
82ed4db4 | 328 | req = scsi_req(rq); |
1da177e4 | 329 | |
a57821ca | 330 | if (hdr->cmd_len > BLK_MAX_CDB) { |
82ed4db4 CH |
331 | req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); |
332 | if (!req->cmd) | |
a57821ca | 333 | goto out_put_request; |
3d6392cf | 334 | } |
1da177e4 | 335 | |
2c4cffe8 PB |
336 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
337 | if (ret < 0) | |
a57821ca | 338 | goto out_free_cdb; |
1da177e4 | 339 | |
d19d7446 | 340 | ret = 0; |
0e75f906 | 341 | if (hdr->iovec_count) { |
26e49cfc | 342 | struct iov_iter i; |
17a05cca | 343 | struct iovec *iov = NULL; |
0e75f906 | 344 | |
e272b89f AV |
345 | ret = import_iovec(rq_data_dir(rq), |
346 | hdr->dxferp, hdr->iovec_count, | |
347 | 0, &iov, &i); | |
348 | if (ret < 0) | |
a57821ca | 349 | goto out_free_cdb; |
0e75f906 | 350 | |
25636e28 | 351 | /* SG_IO howto says that the shorter of the two wins */ |
e272b89f | 352 | iov_iter_truncate(&i, hdr->dxfer_len); |
25636e28 | 353 | |
26e49cfc | 354 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
e0ce0eac | 355 | kfree(iov); |
0e75f906 | 356 | } else if (hdr->dxfer_len) |
152e283f | 357 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
a3bce90e | 358 | GFP_KERNEL); |
0e75f906 MC |
359 | |
360 | if (ret) | |
a57821ca | 361 | goto out_free_cdb; |
0e75f906 | 362 | |
77d172ce | 363 | bio = rq->bio; |
64c7f1d1 | 364 | req->retries = 0; |
01840f9c | 365 | |
1da177e4 LT |
366 | start_time = jiffies; |
367 | ||
368 | /* ignore return value. All information is passed back to caller | |
369 | * (if he doesn't check that is his problem). | |
370 | * N.B. a non-zero SCSI status is _not_ necessarily an error. | |
371 | */ | |
d1515613 | 372 | blk_execute_rq(q, bd_disk, rq, at_head); |
1da177e4 | 373 | |
24bb8fb9 | 374 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
1da177e4 | 375 | |
2cada584 | 376 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
a57821ca CH |
377 | |
378 | out_free_cdb: | |
82ed4db4 | 379 | scsi_req_free_cmd(req); |
a57821ca | 380 | out_put_request: |
dd1cab95 JA |
381 | blk_put_request(rq); |
382 | return ret; | |
1da177e4 LT |
383 | } |
384 | ||
21b2f0c8 CH |
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 | */ | |
1da177e4 | 418 | #define OMAX_SB_LEN 16 /* For backward compatibility */ |
e915e872 AV |
419 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
420 | struct scsi_ioctl_command __user *sic) | |
1da177e4 LT |
421 | { |
422 | struct request *rq; | |
82ed4db4 | 423 | struct scsi_request *req; |
aeb5d727 | 424 | int err; |
1da177e4 | 425 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
82ed4db4 | 426 | char *buffer = NULL; |
1da177e4 | 427 | |
21b2f0c8 CH |
428 | if (!sic) |
429 | return -EINVAL; | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * get in an out lengths, verify they don't exceed a page worth of data | |
433 | */ | |
434 | if (get_user(in_len, &sic->inlen)) | |
435 | return -EFAULT; | |
436 | if (get_user(out_len, &sic->outlen)) | |
437 | return -EFAULT; | |
438 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) | |
439 | return -EINVAL; | |
440 | if (get_user(opcode, sic->data)) | |
441 | return -EFAULT; | |
442 | ||
443 | bytes = max(in_len, out_len); | |
444 | if (bytes) { | |
dd00cc48 | 445 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
1da177e4 LT |
446 | if (!buffer) |
447 | return -ENOMEM; | |
448 | ||
1da177e4 LT |
449 | } |
450 | ||
aebf526b CH |
451 | rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, |
452 | __GFP_RECLAIM); | |
a492f075 JL |
453 | if (IS_ERR(rq)) { |
454 | err = PTR_ERR(rq); | |
92697dc9 | 455 | goto error_free_buffer; |
eb571eea | 456 | } |
82ed4db4 | 457 | req = scsi_req(rq); |
1da177e4 LT |
458 | |
459 | cmdlen = COMMAND_SIZE(opcode); | |
460 | ||
461 | /* | |
462 | * get command and data to send to device, if any | |
463 | */ | |
464 | err = -EFAULT; | |
82ed4db4 CH |
465 | req->cmd_len = cmdlen; |
466 | if (copy_from_user(req->cmd, sic->data, cmdlen)) | |
1da177e4 LT |
467 | goto error; |
468 | ||
21b2f0c8 | 469 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
1da177e4 LT |
470 | goto error; |
471 | ||
82ed4db4 | 472 | err = blk_verify_command(req->cmd, mode & FMODE_WRITE); |
1da177e4 LT |
473 | if (err) |
474 | goto error; | |
475 | ||
21b2f0c8 | 476 | /* default. possible overriden later */ |
64c7f1d1 | 477 | req->retries = 5; |
21b2f0c8 | 478 | |
1da177e4 | 479 | switch (opcode) { |
21b2f0c8 CH |
480 | case SEND_DIAGNOSTIC: |
481 | case FORMAT_UNIT: | |
482 | rq->timeout = FORMAT_UNIT_TIMEOUT; | |
64c7f1d1 | 483 | req->retries = 1; |
21b2f0c8 CH |
484 | break; |
485 | case START_STOP: | |
486 | rq->timeout = START_STOP_TIMEOUT; | |
487 | break; | |
488 | case MOVE_MEDIUM: | |
489 | rq->timeout = MOVE_MEDIUM_TIMEOUT; | |
490 | break; | |
491 | case READ_ELEMENT_STATUS: | |
492 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; | |
493 | break; | |
494 | case READ_DEFECT_DATA: | |
495 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; | |
64c7f1d1 | 496 | req->retries = 1; |
21b2f0c8 CH |
497 | break; |
498 | default: | |
3d6392cf | 499 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
21b2f0c8 CH |
500 | break; |
501 | } | |
502 | ||
71baba4b | 503 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) { |
21b2f0c8 | 504 | err = DRIVER_ERROR << 24; |
84ce0f0e | 505 | goto error; |
1da177e4 LT |
506 | } |
507 | ||
21b2f0c8 CH |
508 | blk_execute_rq(q, disk, rq, 0); |
509 | ||
17d5363b | 510 | err = req->result & 0xff; /* only 8 bit SCSI status */ |
1da177e4 | 511 | if (err) { |
82ed4db4 CH |
512 | if (req->sense_len && req->sense) { |
513 | bytes = (OMAX_SB_LEN > req->sense_len) ? | |
514 | req->sense_len : OMAX_SB_LEN; | |
515 | if (copy_to_user(sic->data, req->sense, bytes)) | |
1da177e4 LT |
516 | err = -EFAULT; |
517 | } | |
518 | } else { | |
519 | if (copy_to_user(sic->data, buffer, out_len)) | |
520 | err = -EFAULT; | |
521 | } | |
522 | ||
523 | error: | |
92697dc9 TB |
524 | blk_put_request(rq); |
525 | ||
526 | error_free_buffer: | |
eb571eea | 527 | kfree(buffer); |
92697dc9 | 528 | |
1da177e4 LT |
529 | return err; |
530 | } | |
21b2f0c8 | 531 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
f98d2dfd BC |
532 | |
533 | /* Send basic block requests */ | |
165125e1 JA |
534 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
535 | int cmd, int data) | |
f98d2dfd BC |
536 | { |
537 | struct request *rq; | |
538 | int err; | |
539 | ||
aebf526b | 540 | rq = blk_get_request(q, REQ_OP_SCSI_OUT, __GFP_RECLAIM); |
a492f075 JL |
541 | if (IS_ERR(rq)) |
542 | return PTR_ERR(rq); | |
3d6392cf | 543 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
82ed4db4 CH |
544 | scsi_req(rq)->cmd[0] = cmd; |
545 | scsi_req(rq)->cmd[4] = data; | |
546 | scsi_req(rq)->cmd_len = 6; | |
b7819b92 | 547 | blk_execute_rq(q, bd_disk, rq, 0); |
17d5363b | 548 | err = scsi_req(rq)->result ? -EIO : 0; |
f98d2dfd BC |
549 | blk_put_request(rq); |
550 | ||
551 | return err; | |
552 | } | |
553 | ||
165125e1 JA |
554 | static inline int blk_send_start_stop(struct request_queue *q, |
555 | struct gendisk *bd_disk, int data) | |
f98d2dfd BC |
556 | { |
557 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); | |
558 | } | |
559 | ||
74f3c8af AV |
560 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
561 | unsigned int cmd, void __user *arg) | |
1da177e4 | 562 | { |
f98d2dfd | 563 | int err; |
1da177e4 | 564 | |
315fceee | 565 | if (!q) |
1da177e4 LT |
566 | return -ENXIO; |
567 | ||
568 | switch (cmd) { | |
569 | /* | |
570 | * new sgv3 interface | |
571 | */ | |
572 | case SG_GET_VERSION_NUM: | |
573 | err = sg_get_version(arg); | |
574 | break; | |
575 | case SCSI_IOCTL_GET_IDLUN: | |
576 | err = scsi_get_idlun(q, arg); | |
577 | break; | |
578 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
579 | err = scsi_get_bus(q, arg); | |
580 | break; | |
581 | case SG_SET_TIMEOUT: | |
582 | err = sg_set_timeout(q, arg); | |
583 | break; | |
584 | case SG_GET_TIMEOUT: | |
585 | err = sg_get_timeout(q); | |
586 | break; | |
587 | case SG_GET_RESERVED_SIZE: | |
588 | err = sg_get_reserved_size(q, arg); | |
589 | break; | |
590 | case SG_SET_RESERVED_SIZE: | |
591 | err = sg_set_reserved_size(q, arg); | |
592 | break; | |
593 | case SG_EMULATED_HOST: | |
594 | err = sg_emulated_host(q, arg); | |
595 | break; | |
596 | case SG_IO: { | |
597 | struct sg_io_hdr hdr; | |
598 | ||
599 | err = -EFAULT; | |
600 | if (copy_from_user(&hdr, arg, sizeof(hdr))) | |
601 | break; | |
74f3c8af | 602 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
603 | if (err == -EFAULT) |
604 | break; | |
605 | ||
606 | if (copy_to_user(arg, &hdr, sizeof(hdr))) | |
607 | err = -EFAULT; | |
608 | break; | |
609 | } | |
610 | case CDROM_SEND_PACKET: { | |
611 | struct cdrom_generic_command cgc; | |
612 | struct sg_io_hdr hdr; | |
613 | ||
614 | err = -EFAULT; | |
615 | if (copy_from_user(&cgc, arg, sizeof(cgc))) | |
616 | break; | |
617 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); | |
618 | memset(&hdr, 0, sizeof(hdr)); | |
619 | hdr.interface_id = 'S'; | |
620 | hdr.cmd_len = sizeof(cgc.cmd); | |
621 | hdr.dxfer_len = cgc.buflen; | |
622 | err = 0; | |
623 | switch (cgc.data_direction) { | |
624 | case CGC_DATA_UNKNOWN: | |
625 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; | |
626 | break; | |
627 | case CGC_DATA_WRITE: | |
628 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
629 | break; | |
630 | case CGC_DATA_READ: | |
631 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
632 | break; | |
633 | case CGC_DATA_NONE: | |
634 | hdr.dxfer_direction = SG_DXFER_NONE; | |
635 | break; | |
636 | default: | |
637 | err = -EINVAL; | |
638 | } | |
639 | if (err) | |
640 | break; | |
641 | ||
642 | hdr.dxferp = cgc.buffer; | |
643 | hdr.sbp = cgc.sense; | |
644 | if (hdr.sbp) | |
645 | hdr.mx_sb_len = sizeof(struct request_sense); | |
ad337591 | 646 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
1da177e4 LT |
647 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
648 | hdr.cmd_len = sizeof(cgc.cmd); | |
649 | ||
74f3c8af | 650 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
651 | if (err == -EFAULT) |
652 | break; | |
653 | ||
654 | if (hdr.status) | |
655 | err = -EIO; | |
656 | ||
657 | cgc.stat = err; | |
658 | cgc.buflen = hdr.resid; | |
659 | if (copy_to_user(arg, &cgc, sizeof(cgc))) | |
660 | err = -EFAULT; | |
661 | ||
662 | break; | |
663 | } | |
664 | ||
665 | /* | |
666 | * old junk scsi send command ioctl | |
667 | */ | |
668 | case SCSI_IOCTL_SEND_COMMAND: | |
669 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); | |
670 | err = -EINVAL; | |
671 | if (!arg) | |
672 | break; | |
673 | ||
74f3c8af | 674 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
1da177e4 LT |
675 | break; |
676 | case CDROMCLOSETRAY: | |
f98d2dfd BC |
677 | err = blk_send_start_stop(q, bd_disk, 0x03); |
678 | break; | |
1da177e4 | 679 | case CDROMEJECT: |
f98d2dfd | 680 | err = blk_send_start_stop(q, bd_disk, 0x02); |
1da177e4 LT |
681 | break; |
682 | default: | |
683 | err = -ENOTTY; | |
684 | } | |
685 | ||
1da177e4 LT |
686 | return err; |
687 | } | |
1da177e4 | 688 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
018e0446 | 689 | |
0bfc96cb PB |
690 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
691 | { | |
692 | if (bd && bd == bd->bd_contains) | |
693 | return 0; | |
694 | ||
695 | /* Actually none of these is particularly useful on a partition, | |
696 | * but they are safe. | |
697 | */ | |
698 | switch (cmd) { | |
699 | case SCSI_IOCTL_GET_IDLUN: | |
700 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
701 | case SCSI_IOCTL_GET_PCI: | |
702 | case SCSI_IOCTL_PROBE_HOST: | |
703 | case SG_GET_VERSION_NUM: | |
704 | case SG_SET_TIMEOUT: | |
705 | case SG_GET_TIMEOUT: | |
706 | case SG_GET_RESERVED_SIZE: | |
707 | case SG_SET_RESERVED_SIZE: | |
708 | case SG_EMULATED_HOST: | |
709 | return 0; | |
710 | case CDROM_GET_CAPABILITY: | |
711 | /* Keep this until we remove the printk below. udev sends it | |
712 | * and we do not want to spam dmesg about it. CD-ROMs do | |
713 | * not have partitions, so we get here only for disks. | |
714 | */ | |
715 | return -ENOIOCTLCMD; | |
716 | default: | |
717 | break; | |
718 | } | |
719 | ||
6d935928 JK |
720 | if (capable(CAP_SYS_RAWIO)) |
721 | return 0; | |
722 | ||
0bfc96cb PB |
723 | /* In particular, rule out all resets and host-specific ioctls. */ |
724 | printk_ratelimited(KERN_WARNING | |
725 | "%s: sending ioctl %x to a partition!\n", current->comm, cmd); | |
726 | ||
6d935928 | 727 | return -ENOIOCTLCMD; |
0bfc96cb PB |
728 | } |
729 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); | |
730 | ||
577ebb37 PB |
731 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
732 | unsigned int cmd, void __user *arg) | |
733 | { | |
0bfc96cb PB |
734 | int ret; |
735 | ||
736 | ret = scsi_verify_blk_ioctl(bd, cmd); | |
737 | if (ret < 0) | |
738 | return ret; | |
739 | ||
577ebb37 PB |
740 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
741 | } | |
742 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); | |
743 | ||
c8d9cf22 BVA |
744 | /** |
745 | * scsi_req_init - initialize certain fields of a scsi_request structure | |
746 | * @req: Pointer to a scsi_request structure. | |
747 | * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members | |
748 | * of struct scsi_request. | |
749 | */ | |
750 | void scsi_req_init(struct scsi_request *req) | |
82ed4db4 | 751 | { |
82ed4db4 CH |
752 | memset(req->__cmd, 0, sizeof(req->__cmd)); |
753 | req->cmd = req->__cmd; | |
754 | req->cmd_len = BLK_MAX_CDB; | |
755 | req->sense_len = 0; | |
756 | } | |
757 | EXPORT_SYMBOL(scsi_req_init); | |
758 | ||
476d42f1 | 759 | static int __init blk_scsi_ioctl_init(void) |
018e0446 JA |
760 | { |
761 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); | |
762 | return 0; | |
763 | } | |
76da0346 | 764 | fs_initcall(blk_scsi_ioctl_init); |