Commit | Line | Data |
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8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> | |
1da177e4 LT |
4 | */ |
5 | #include <linux/kernel.h> | |
6 | #include <linux/errno.h> | |
7 | #include <linux/string.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/blkdev.h> | |
c59ede7b | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/completion.h> |
12 | #include <linux/cdrom.h> | |
0bfc96cb | 13 | #include <linux/ratelimit.h> |
1da177e4 LT |
14 | #include <linux/slab.h> |
15 | #include <linux/times.h> | |
a27bb332 | 16 | #include <linux/uio.h> |
7c0f6ba6 | 17 | #include <linux/uaccess.h> |
1da177e4 LT |
18 | |
19 | #include <scsi/scsi.h> | |
20 | #include <scsi/scsi_ioctl.h> | |
21 | #include <scsi/scsi_cmnd.h> | |
22 | ||
018e0446 JA |
23 | struct blk_cmd_filter { |
24 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; | |
25 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
476d42f1 HS |
26 | }; |
27 | ||
28 | static struct blk_cmd_filter blk_default_cmd_filter; | |
018e0446 | 29 | |
1da177e4 | 30 | /* Command group 3 is reserved and should never be used. */ |
db4742dd | 31 | const unsigned char scsi_command_size_tbl[8] = |
1da177e4 LT |
32 | { |
33 | 6, 10, 10, 12, | |
34 | 16, 12, 10, 10 | |
35 | }; | |
db4742dd | 36 | EXPORT_SYMBOL(scsi_command_size_tbl); |
1da177e4 | 37 | |
1da177e4 LT |
38 | #include <scsi/sg.h> |
39 | ||
40 | static int sg_get_version(int __user *p) | |
41 | { | |
64100099 | 42 | static const int sg_version_num = 30527; |
1da177e4 LT |
43 | return put_user(sg_version_num, p); |
44 | } | |
45 | ||
165125e1 | 46 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
1da177e4 LT |
47 | { |
48 | return put_user(0, p); | |
49 | } | |
50 | ||
165125e1 | 51 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
1da177e4 LT |
52 | { |
53 | return put_user(0, p); | |
54 | } | |
55 | ||
165125e1 | 56 | static int sg_get_timeout(struct request_queue *q) |
1da177e4 | 57 | { |
2b91bafc | 58 | return jiffies_to_clock_t(q->sg_timeout); |
1da177e4 LT |
59 | } |
60 | ||
165125e1 | 61 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
1da177e4 LT |
62 | { |
63 | int timeout, err = get_user(timeout, p); | |
64 | ||
65 | if (!err) | |
2b91bafc | 66 | q->sg_timeout = clock_t_to_jiffies(timeout); |
1da177e4 LT |
67 | |
68 | return err; | |
69 | } | |
70 | ||
9b4231bf AM |
71 | static int max_sectors_bytes(struct request_queue *q) |
72 | { | |
73 | unsigned int max_sectors = queue_max_sectors(q); | |
74 | ||
75 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
76 | ||
77 | return max_sectors << 9; | |
78 | } | |
79 | ||
165125e1 | 80 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 | 81 | { |
9b4231bf | 82 | int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); |
44ec9542 AS |
83 | |
84 | return put_user(val, p); | |
1da177e4 LT |
85 | } |
86 | ||
165125e1 | 87 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 LT |
88 | { |
89 | int size, err = get_user(size, p); | |
90 | ||
91 | if (err) | |
92 | return err; | |
93 | ||
94 | if (size < 0) | |
95 | return -EINVAL; | |
1da177e4 | 96 | |
9b4231bf | 97 | q->sg_reserved_size = min(size, max_sectors_bytes(q)); |
1da177e4 LT |
98 | return 0; |
99 | } | |
100 | ||
101 | /* | |
102 | * will always return that we are ATAPI even for a real SCSI drive, I'm not | |
103 | * so sure this is worth doing anything about (why would you care??) | |
104 | */ | |
165125e1 | 105 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
1da177e4 LT |
106 | { |
107 | return put_user(1, p); | |
108 | } | |
109 | ||
018e0446 | 110 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
abf54393 FT |
111 | { |
112 | /* Basic read-only commands */ | |
113 | __set_bit(TEST_UNIT_READY, filter->read_ok); | |
114 | __set_bit(REQUEST_SENSE, filter->read_ok); | |
115 | __set_bit(READ_6, filter->read_ok); | |
116 | __set_bit(READ_10, filter->read_ok); | |
117 | __set_bit(READ_12, filter->read_ok); | |
118 | __set_bit(READ_16, filter->read_ok); | |
119 | __set_bit(READ_BUFFER, filter->read_ok); | |
120 | __set_bit(READ_DEFECT_DATA, filter->read_ok); | |
121 | __set_bit(READ_CAPACITY, filter->read_ok); | |
122 | __set_bit(READ_LONG, filter->read_ok); | |
123 | __set_bit(INQUIRY, filter->read_ok); | |
124 | __set_bit(MODE_SENSE, filter->read_ok); | |
125 | __set_bit(MODE_SENSE_10, filter->read_ok); | |
126 | __set_bit(LOG_SENSE, filter->read_ok); | |
127 | __set_bit(START_STOP, filter->read_ok); | |
128 | __set_bit(GPCMD_VERIFY_10, filter->read_ok); | |
129 | __set_bit(VERIFY_16, filter->read_ok); | |
130 | __set_bit(REPORT_LUNS, filter->read_ok); | |
eb846d9f | 131 | __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); |
abf54393 FT |
132 | __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); |
133 | __set_bit(MAINTENANCE_IN, filter->read_ok); | |
134 | __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); | |
135 | ||
136 | /* Audio CD commands */ | |
137 | __set_bit(GPCMD_PLAY_CD, filter->read_ok); | |
138 | __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); | |
139 | __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); | |
140 | __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); | |
141 | __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); | |
142 | ||
143 | /* CD/DVD data reading */ | |
144 | __set_bit(GPCMD_READ_CD, filter->read_ok); | |
145 | __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); | |
146 | __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); | |
147 | __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); | |
148 | __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); | |
149 | __set_bit(GPCMD_READ_HEADER, filter->read_ok); | |
150 | __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); | |
151 | __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); | |
152 | __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); | |
153 | __set_bit(GPCMD_REPORT_KEY, filter->read_ok); | |
154 | __set_bit(GPCMD_SCAN, filter->read_ok); | |
155 | __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); | |
156 | __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); | |
157 | __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); | |
158 | __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); | |
159 | __set_bit(GPCMD_SEEK, filter->read_ok); | |
160 | __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); | |
161 | ||
162 | /* Basic writing commands */ | |
163 | __set_bit(WRITE_6, filter->write_ok); | |
164 | __set_bit(WRITE_10, filter->write_ok); | |
165 | __set_bit(WRITE_VERIFY, filter->write_ok); | |
166 | __set_bit(WRITE_12, filter->write_ok); | |
167 | __set_bit(WRITE_VERIFY_12, filter->write_ok); | |
168 | __set_bit(WRITE_16, filter->write_ok); | |
169 | __set_bit(WRITE_LONG, filter->write_ok); | |
170 | __set_bit(WRITE_LONG_2, filter->write_ok); | |
25cdb645 MFO |
171 | __set_bit(WRITE_SAME, filter->write_ok); |
172 | __set_bit(WRITE_SAME_16, filter->write_ok); | |
173 | __set_bit(WRITE_SAME_32, filter->write_ok); | |
abf54393 FT |
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); | |
35e396cd | 193 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
abf54393 | 194 | } |
018e0446 | 195 | |
f00c4d80 | 196 | int blk_verify_command(unsigned char *cmd, fmode_t mode) |
018e0446 JA |
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 | ||
018e0446 JA |
204 | /* Anybody who can open the device can do a read-safe command */ |
205 | if (test_bit(cmd[0], filter->read_ok)) | |
206 | return 0; | |
207 | ||
208 | /* Write-safe commands require a writable open */ | |
f00c4d80 | 209 | if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE)) |
018e0446 JA |
210 | return 0; |
211 | ||
212 | return -EPERM; | |
213 | } | |
214 | EXPORT_SYMBOL(blk_verify_command); | |
abf54393 | 215 | |
165125e1 | 216 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
5842e51f | 217 | struct sg_io_hdr *hdr, fmode_t mode) |
3d6392cf | 218 | { |
82ed4db4 CH |
219 | struct scsi_request *req = scsi_req(rq); |
220 | ||
221 | if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) | |
3d6392cf | 222 | return -EFAULT; |
f00c4d80 | 223 | if (blk_verify_command(req->cmd, mode)) |
3d6392cf JA |
224 | return -EPERM; |
225 | ||
226 | /* | |
227 | * fill in request structure | |
228 | */ | |
82ed4db4 | 229 | req->cmd_len = hdr->cmd_len; |
3d6392cf | 230 | |
24bb8fb9 | 231 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
3d6392cf JA |
232 | if (!rq->timeout) |
233 | rq->timeout = q->sg_timeout; | |
234 | if (!rq->timeout) | |
235 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
236 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
237 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
3d6392cf JA |
238 | |
239 | return 0; | |
240 | } | |
3d6392cf | 241 | |
41e1703b FT |
242 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
243 | struct bio *bio) | |
3d6392cf | 244 | { |
82ed4db4 | 245 | struct scsi_request *req = scsi_req(rq); |
91e463c8 | 246 | int r, ret = 0; |
3d6392cf JA |
247 | |
248 | /* | |
249 | * fill in all the output members | |
250 | */ | |
17d5363b CH |
251 | hdr->status = req->result & 0xff; |
252 | hdr->masked_status = status_byte(req->result); | |
253 | hdr->msg_status = msg_byte(req->result); | |
254 | hdr->host_status = host_byte(req->result); | |
255 | hdr->driver_status = driver_byte(req->result); | |
3d6392cf JA |
256 | hdr->info = 0; |
257 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) | |
258 | hdr->info |= SG_INFO_CHECK; | |
82ed4db4 | 259 | hdr->resid = req->resid_len; |
3d6392cf JA |
260 | hdr->sb_len_wr = 0; |
261 | ||
82ed4db4 CH |
262 | if (req->sense_len && hdr->sbp) { |
263 | int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); | |
3d6392cf | 264 | |
82ed4db4 | 265 | if (!copy_to_user(hdr->sbp, req->sense, len)) |
3d6392cf JA |
266 | hdr->sb_len_wr = len; |
267 | else | |
268 | ret = -EFAULT; | |
269 | } | |
270 | ||
91e463c8 FT |
271 | r = blk_rq_unmap_user(bio); |
272 | if (!ret) | |
273 | ret = r; | |
3d6392cf | 274 | |
1cd96c24 | 275 | return ret; |
3d6392cf | 276 | } |
3d6392cf | 277 | |
5842e51f AV |
278 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
279 | struct sg_io_hdr *hdr, fmode_t mode) | |
1da177e4 | 280 | { |
3d6392cf | 281 | unsigned long start_time; |
e0ce0eac KO |
282 | ssize_t ret = 0; |
283 | int writing = 0; | |
d1515613 | 284 | int at_head = 0; |
1da177e4 | 285 | struct request *rq; |
82ed4db4 | 286 | struct scsi_request *req; |
77d172ce | 287 | struct bio *bio; |
1da177e4 LT |
288 | |
289 | if (hdr->interface_id != 'S') | |
290 | return -EINVAL; | |
1da177e4 | 291 | |
ae03bf63 | 292 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
1da177e4 LT |
293 | return -EIO; |
294 | ||
f1970baf | 295 | if (hdr->dxfer_len) |
1da177e4 LT |
296 | switch (hdr->dxfer_direction) { |
297 | default: | |
298 | return -EINVAL; | |
1da177e4 LT |
299 | case SG_DXFER_TO_DEV: |
300 | writing = 1; | |
301 | break; | |
616e8a09 | 302 | case SG_DXFER_TO_FROM_DEV: |
1da177e4 | 303 | case SG_DXFER_FROM_DEV: |
1da177e4 LT |
304 | break; |
305 | } | |
d1515613 DG |
306 | if (hdr->flags & SG_FLAG_Q_AT_HEAD) |
307 | at_head = 1; | |
1da177e4 | 308 | |
a57821ca | 309 | ret = -ENOMEM; |
ff005a06 | 310 | rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 JL |
311 | if (IS_ERR(rq)) |
312 | return PTR_ERR(rq); | |
82ed4db4 | 313 | req = scsi_req(rq); |
1da177e4 | 314 | |
a57821ca | 315 | if (hdr->cmd_len > BLK_MAX_CDB) { |
82ed4db4 CH |
316 | req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); |
317 | if (!req->cmd) | |
a57821ca | 318 | goto out_put_request; |
3d6392cf | 319 | } |
1da177e4 | 320 | |
2c4cffe8 PB |
321 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
322 | if (ret < 0) | |
a57821ca | 323 | goto out_free_cdb; |
1da177e4 | 324 | |
d19d7446 | 325 | ret = 0; |
0e75f906 | 326 | if (hdr->iovec_count) { |
26e49cfc | 327 | struct iov_iter i; |
17a05cca | 328 | struct iovec *iov = NULL; |
0e75f906 | 329 | |
e272b89f AV |
330 | ret = import_iovec(rq_data_dir(rq), |
331 | hdr->dxferp, hdr->iovec_count, | |
332 | 0, &iov, &i); | |
333 | if (ret < 0) | |
a57821ca | 334 | goto out_free_cdb; |
0e75f906 | 335 | |
25636e28 | 336 | /* SG_IO howto says that the shorter of the two wins */ |
e272b89f | 337 | iov_iter_truncate(&i, hdr->dxfer_len); |
25636e28 | 338 | |
26e49cfc | 339 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
e0ce0eac | 340 | kfree(iov); |
0e75f906 | 341 | } else if (hdr->dxfer_len) |
152e283f | 342 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
a3bce90e | 343 | GFP_KERNEL); |
0e75f906 MC |
344 | |
345 | if (ret) | |
a57821ca | 346 | goto out_free_cdb; |
0e75f906 | 347 | |
77d172ce | 348 | bio = rq->bio; |
64c7f1d1 | 349 | req->retries = 0; |
01840f9c | 350 | |
1da177e4 LT |
351 | start_time = jiffies; |
352 | ||
353 | /* ignore return value. All information is passed back to caller | |
354 | * (if he doesn't check that is his problem). | |
355 | * N.B. a non-zero SCSI status is _not_ necessarily an error. | |
356 | */ | |
d1515613 | 357 | blk_execute_rq(q, bd_disk, rq, at_head); |
1da177e4 | 358 | |
24bb8fb9 | 359 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
1da177e4 | 360 | |
2cada584 | 361 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
a57821ca CH |
362 | |
363 | out_free_cdb: | |
82ed4db4 | 364 | scsi_req_free_cmd(req); |
a57821ca | 365 | out_put_request: |
dd1cab95 JA |
366 | blk_put_request(rq); |
367 | return ret; | |
1da177e4 LT |
368 | } |
369 | ||
21b2f0c8 CH |
370 | /** |
371 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl | |
21b2f0c8 CH |
372 | * @q: request queue to send scsi commands down |
373 | * @disk: gendisk to operate on (option) | |
aa98192d BVA |
374 | * @mode: mode used to open the file through which the ioctl has been |
375 | * submitted | |
21b2f0c8 CH |
376 | * @sic: userspace structure describing the command to perform |
377 | * | |
378 | * Send down the scsi command described by @sic to the device below | |
379 | * the request queue @q. If @file is non-NULL it's used to perform | |
380 | * fine-grained permission checks that allow users to send down | |
381 | * non-destructive SCSI commands. If the caller has a struct gendisk | |
382 | * available it should be passed in as @disk to allow the low level | |
383 | * driver to use the information contained in it. A non-NULL @disk | |
384 | * is only allowed if the caller knows that the low level driver doesn't | |
385 | * need it (e.g. in the scsi subsystem). | |
386 | * | |
387 | * Notes: | |
388 | * - This interface is deprecated - users should use the SG_IO | |
389 | * interface instead, as this is a more flexible approach to | |
390 | * performing SCSI commands on a device. | |
391 | * - The SCSI command length is determined by examining the 1st byte | |
392 | * of the given command. There is no way to override this. | |
393 | * - Data transfers are limited to PAGE_SIZE | |
394 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to | |
395 | * accommodate the sense buffer when an error occurs. | |
396 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that | |
397 | * old code will not be surprised. | |
398 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive | |
399 | * a negative return and the Unix error code in 'errno'. | |
400 | * If the SCSI command succeeds then 0 is returned. | |
401 | * Positive numbers returned are the compacted SCSI error codes (4 | |
402 | * bytes in one int) where the lowest byte is the SCSI status. | |
403 | */ | |
e915e872 AV |
404 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
405 | struct scsi_ioctl_command __user *sic) | |
1da177e4 | 406 | { |
aa98192d | 407 | enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */ |
1da177e4 | 408 | struct request *rq; |
82ed4db4 | 409 | struct scsi_request *req; |
aeb5d727 | 410 | int err; |
1da177e4 | 411 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
82ed4db4 | 412 | char *buffer = NULL; |
1da177e4 | 413 | |
21b2f0c8 CH |
414 | if (!sic) |
415 | return -EINVAL; | |
416 | ||
1da177e4 LT |
417 | /* |
418 | * get in an out lengths, verify they don't exceed a page worth of data | |
419 | */ | |
420 | if (get_user(in_len, &sic->inlen)) | |
421 | return -EFAULT; | |
422 | if (get_user(out_len, &sic->outlen)) | |
423 | return -EFAULT; | |
424 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) | |
425 | return -EINVAL; | |
426 | if (get_user(opcode, sic->data)) | |
427 | return -EFAULT; | |
428 | ||
429 | bytes = max(in_len, out_len); | |
430 | if (bytes) { | |
dd00cc48 | 431 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
1da177e4 LT |
432 | if (!buffer) |
433 | return -ENOMEM; | |
434 | ||
1da177e4 LT |
435 | } |
436 | ||
ff005a06 | 437 | rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 JL |
438 | if (IS_ERR(rq)) { |
439 | err = PTR_ERR(rq); | |
92697dc9 | 440 | goto error_free_buffer; |
eb571eea | 441 | } |
82ed4db4 | 442 | req = scsi_req(rq); |
1da177e4 LT |
443 | |
444 | cmdlen = COMMAND_SIZE(opcode); | |
445 | ||
446 | /* | |
447 | * get command and data to send to device, if any | |
448 | */ | |
449 | err = -EFAULT; | |
82ed4db4 CH |
450 | req->cmd_len = cmdlen; |
451 | if (copy_from_user(req->cmd, sic->data, cmdlen)) | |
1da177e4 LT |
452 | goto error; |
453 | ||
21b2f0c8 | 454 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
1da177e4 LT |
455 | goto error; |
456 | ||
f00c4d80 | 457 | err = blk_verify_command(req->cmd, mode); |
1da177e4 LT |
458 | if (err) |
459 | goto error; | |
460 | ||
21b2f0c8 | 461 | /* default. possible overriden later */ |
64c7f1d1 | 462 | req->retries = 5; |
21b2f0c8 | 463 | |
1da177e4 | 464 | switch (opcode) { |
21b2f0c8 CH |
465 | case SEND_DIAGNOSTIC: |
466 | case FORMAT_UNIT: | |
467 | rq->timeout = FORMAT_UNIT_TIMEOUT; | |
64c7f1d1 | 468 | req->retries = 1; |
21b2f0c8 CH |
469 | break; |
470 | case START_STOP: | |
471 | rq->timeout = START_STOP_TIMEOUT; | |
472 | break; | |
473 | case MOVE_MEDIUM: | |
474 | rq->timeout = MOVE_MEDIUM_TIMEOUT; | |
475 | break; | |
476 | case READ_ELEMENT_STATUS: | |
477 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; | |
478 | break; | |
479 | case READ_DEFECT_DATA: | |
480 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; | |
64c7f1d1 | 481 | req->retries = 1; |
21b2f0c8 CH |
482 | break; |
483 | default: | |
3d6392cf | 484 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
21b2f0c8 CH |
485 | break; |
486 | } | |
487 | ||
0eb0b63c | 488 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) { |
21b2f0c8 | 489 | err = DRIVER_ERROR << 24; |
84ce0f0e | 490 | goto error; |
1da177e4 LT |
491 | } |
492 | ||
21b2f0c8 CH |
493 | blk_execute_rq(q, disk, rq, 0); |
494 | ||
17d5363b | 495 | err = req->result & 0xff; /* only 8 bit SCSI status */ |
1da177e4 | 496 | if (err) { |
82ed4db4 CH |
497 | if (req->sense_len && req->sense) { |
498 | bytes = (OMAX_SB_LEN > req->sense_len) ? | |
499 | req->sense_len : OMAX_SB_LEN; | |
500 | if (copy_to_user(sic->data, req->sense, bytes)) | |
1da177e4 LT |
501 | err = -EFAULT; |
502 | } | |
503 | } else { | |
504 | if (copy_to_user(sic->data, buffer, out_len)) | |
505 | err = -EFAULT; | |
506 | } | |
507 | ||
508 | error: | |
92697dc9 TB |
509 | blk_put_request(rq); |
510 | ||
511 | error_free_buffer: | |
eb571eea | 512 | kfree(buffer); |
92697dc9 | 513 | |
1da177e4 LT |
514 | return err; |
515 | } | |
21b2f0c8 | 516 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
f98d2dfd BC |
517 | |
518 | /* Send basic block requests */ | |
165125e1 JA |
519 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
520 | int cmd, int data) | |
f98d2dfd BC |
521 | { |
522 | struct request *rq; | |
523 | int err; | |
524 | ||
ff005a06 | 525 | rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0); |
a492f075 JL |
526 | if (IS_ERR(rq)) |
527 | return PTR_ERR(rq); | |
3d6392cf | 528 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
82ed4db4 CH |
529 | scsi_req(rq)->cmd[0] = cmd; |
530 | scsi_req(rq)->cmd[4] = data; | |
531 | scsi_req(rq)->cmd_len = 6; | |
b7819b92 | 532 | blk_execute_rq(q, bd_disk, rq, 0); |
17d5363b | 533 | err = scsi_req(rq)->result ? -EIO : 0; |
f98d2dfd BC |
534 | blk_put_request(rq); |
535 | ||
536 | return err; | |
537 | } | |
538 | ||
165125e1 JA |
539 | static inline int blk_send_start_stop(struct request_queue *q, |
540 | struct gendisk *bd_disk, int data) | |
f98d2dfd BC |
541 | { |
542 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); | |
543 | } | |
544 | ||
74f3c8af AV |
545 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
546 | unsigned int cmd, void __user *arg) | |
1da177e4 | 547 | { |
f98d2dfd | 548 | int err; |
1da177e4 | 549 | |
315fceee | 550 | if (!q) |
1da177e4 LT |
551 | return -ENXIO; |
552 | ||
553 | switch (cmd) { | |
554 | /* | |
555 | * new sgv3 interface | |
556 | */ | |
557 | case SG_GET_VERSION_NUM: | |
558 | err = sg_get_version(arg); | |
559 | break; | |
560 | case SCSI_IOCTL_GET_IDLUN: | |
561 | err = scsi_get_idlun(q, arg); | |
562 | break; | |
563 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
564 | err = scsi_get_bus(q, arg); | |
565 | break; | |
566 | case SG_SET_TIMEOUT: | |
567 | err = sg_set_timeout(q, arg); | |
568 | break; | |
569 | case SG_GET_TIMEOUT: | |
570 | err = sg_get_timeout(q); | |
571 | break; | |
572 | case SG_GET_RESERVED_SIZE: | |
573 | err = sg_get_reserved_size(q, arg); | |
574 | break; | |
575 | case SG_SET_RESERVED_SIZE: | |
576 | err = sg_set_reserved_size(q, arg); | |
577 | break; | |
578 | case SG_EMULATED_HOST: | |
579 | err = sg_emulated_host(q, arg); | |
580 | break; | |
581 | case SG_IO: { | |
582 | struct sg_io_hdr hdr; | |
583 | ||
584 | err = -EFAULT; | |
585 | if (copy_from_user(&hdr, arg, sizeof(hdr))) | |
586 | break; | |
74f3c8af | 587 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
588 | if (err == -EFAULT) |
589 | break; | |
590 | ||
591 | if (copy_to_user(arg, &hdr, sizeof(hdr))) | |
592 | err = -EFAULT; | |
593 | break; | |
594 | } | |
595 | case CDROM_SEND_PACKET: { | |
596 | struct cdrom_generic_command cgc; | |
597 | struct sg_io_hdr hdr; | |
598 | ||
599 | err = -EFAULT; | |
600 | if (copy_from_user(&cgc, arg, sizeof(cgc))) | |
601 | break; | |
602 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); | |
603 | memset(&hdr, 0, sizeof(hdr)); | |
604 | hdr.interface_id = 'S'; | |
605 | hdr.cmd_len = sizeof(cgc.cmd); | |
606 | hdr.dxfer_len = cgc.buflen; | |
607 | err = 0; | |
608 | switch (cgc.data_direction) { | |
609 | case CGC_DATA_UNKNOWN: | |
610 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; | |
611 | break; | |
612 | case CGC_DATA_WRITE: | |
613 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
614 | break; | |
615 | case CGC_DATA_READ: | |
616 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
617 | break; | |
618 | case CGC_DATA_NONE: | |
619 | hdr.dxfer_direction = SG_DXFER_NONE; | |
620 | break; | |
621 | default: | |
622 | err = -EINVAL; | |
623 | } | |
624 | if (err) | |
625 | break; | |
626 | ||
627 | hdr.dxferp = cgc.buffer; | |
628 | hdr.sbp = cgc.sense; | |
629 | if (hdr.sbp) | |
630 | hdr.mx_sb_len = sizeof(struct request_sense); | |
ad337591 | 631 | hdr.timeout = jiffies_to_msecs(cgc.timeout); |
1da177e4 LT |
632 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; |
633 | hdr.cmd_len = sizeof(cgc.cmd); | |
634 | ||
74f3c8af | 635 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
636 | if (err == -EFAULT) |
637 | break; | |
638 | ||
639 | if (hdr.status) | |
640 | err = -EIO; | |
641 | ||
642 | cgc.stat = err; | |
643 | cgc.buflen = hdr.resid; | |
644 | if (copy_to_user(arg, &cgc, sizeof(cgc))) | |
645 | err = -EFAULT; | |
646 | ||
647 | break; | |
648 | } | |
649 | ||
650 | /* | |
651 | * old junk scsi send command ioctl | |
652 | */ | |
653 | case SCSI_IOCTL_SEND_COMMAND: | |
654 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); | |
655 | err = -EINVAL; | |
656 | if (!arg) | |
657 | break; | |
658 | ||
74f3c8af | 659 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
1da177e4 LT |
660 | break; |
661 | case CDROMCLOSETRAY: | |
f98d2dfd BC |
662 | err = blk_send_start_stop(q, bd_disk, 0x03); |
663 | break; | |
1da177e4 | 664 | case CDROMEJECT: |
f98d2dfd | 665 | err = blk_send_start_stop(q, bd_disk, 0x02); |
1da177e4 LT |
666 | break; |
667 | default: | |
668 | err = -ENOTTY; | |
669 | } | |
670 | ||
1da177e4 LT |
671 | return err; |
672 | } | |
1da177e4 | 673 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
018e0446 | 674 | |
0bfc96cb PB |
675 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
676 | { | |
677 | if (bd && bd == bd->bd_contains) | |
678 | return 0; | |
679 | ||
6d935928 JK |
680 | if (capable(CAP_SYS_RAWIO)) |
681 | return 0; | |
682 | ||
6d935928 | 683 | return -ENOIOCTLCMD; |
0bfc96cb PB |
684 | } |
685 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); | |
686 | ||
577ebb37 PB |
687 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
688 | unsigned int cmd, void __user *arg) | |
689 | { | |
0bfc96cb PB |
690 | int ret; |
691 | ||
692 | ret = scsi_verify_blk_ioctl(bd, cmd); | |
693 | if (ret < 0) | |
694 | return ret; | |
695 | ||
577ebb37 PB |
696 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
697 | } | |
698 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); | |
699 | ||
c8d9cf22 BVA |
700 | /** |
701 | * scsi_req_init - initialize certain fields of a scsi_request structure | |
702 | * @req: Pointer to a scsi_request structure. | |
703 | * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members | |
704 | * of struct scsi_request. | |
705 | */ | |
706 | void scsi_req_init(struct scsi_request *req) | |
82ed4db4 | 707 | { |
82ed4db4 CH |
708 | memset(req->__cmd, 0, sizeof(req->__cmd)); |
709 | req->cmd = req->__cmd; | |
710 | req->cmd_len = BLK_MAX_CDB; | |
711 | req->sense_len = 0; | |
712 | } | |
713 | EXPORT_SYMBOL(scsi_req_init); | |
714 | ||
476d42f1 | 715 | static int __init blk_scsi_ioctl_init(void) |
018e0446 JA |
716 | { |
717 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); | |
718 | return 0; | |
719 | } | |
76da0346 | 720 | fs_initcall(blk_scsi_ioctl_init); |