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 | 4 | */ |
98aaaec4 | 5 | #include <linux/compat.h> |
1da177e4 LT |
6 | #include <linux/kernel.h> |
7 | #include <linux/errno.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/blkdev.h> | |
c59ede7b | 11 | #include <linux/capability.h> |
1da177e4 LT |
12 | #include <linux/completion.h> |
13 | #include <linux/cdrom.h> | |
0bfc96cb | 14 | #include <linux/ratelimit.h> |
1da177e4 LT |
15 | #include <linux/slab.h> |
16 | #include <linux/times.h> | |
a27bb332 | 17 | #include <linux/uio.h> |
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
1da177e4 LT |
19 | |
20 | #include <scsi/scsi.h> | |
21 | #include <scsi/scsi_ioctl.h> | |
22 | #include <scsi/scsi_cmnd.h> | |
78ed001d | 23 | #include <scsi/sg.h> |
1da177e4 | 24 | |
018e0446 JA |
25 | struct blk_cmd_filter { |
26 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; | |
27 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
476d42f1 HS |
28 | }; |
29 | ||
30 | static struct blk_cmd_filter blk_default_cmd_filter; | |
018e0446 | 31 | |
1da177e4 | 32 | /* Command group 3 is reserved and should never be used. */ |
db4742dd | 33 | const unsigned char scsi_command_size_tbl[8] = |
1da177e4 LT |
34 | { |
35 | 6, 10, 10, 12, | |
36 | 16, 12, 10, 10 | |
37 | }; | |
db4742dd | 38 | EXPORT_SYMBOL(scsi_command_size_tbl); |
1da177e4 | 39 | |
1da177e4 LT |
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); |
6fdb79ff RA |
194 | |
195 | /* ZBC Commands */ | |
196 | __set_bit(ZBC_OUT, filter->write_ok); | |
197 | __set_bit(ZBC_IN, filter->read_ok); | |
abf54393 | 198 | } |
018e0446 | 199 | |
f00c4d80 | 200 | int blk_verify_command(unsigned char *cmd, fmode_t mode) |
018e0446 JA |
201 | { |
202 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; | |
203 | ||
204 | /* root can do any command. */ | |
205 | if (capable(CAP_SYS_RAWIO)) | |
206 | return 0; | |
207 | ||
018e0446 JA |
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 */ | |
f00c4d80 | 213 | if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE)) |
018e0446 JA |
214 | return 0; |
215 | ||
216 | return -EPERM; | |
217 | } | |
218 | EXPORT_SYMBOL(blk_verify_command); | |
abf54393 | 219 | |
165125e1 | 220 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
5842e51f | 221 | struct sg_io_hdr *hdr, fmode_t mode) |
3d6392cf | 222 | { |
82ed4db4 CH |
223 | struct scsi_request *req = scsi_req(rq); |
224 | ||
225 | if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) | |
3d6392cf | 226 | return -EFAULT; |
f00c4d80 | 227 | if (blk_verify_command(req->cmd, mode)) |
3d6392cf JA |
228 | return -EPERM; |
229 | ||
230 | /* | |
231 | * fill in request structure | |
232 | */ | |
82ed4db4 | 233 | req->cmd_len = hdr->cmd_len; |
3d6392cf | 234 | |
24bb8fb9 | 235 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
3d6392cf JA |
236 | if (!rq->timeout) |
237 | rq->timeout = q->sg_timeout; | |
238 | if (!rq->timeout) | |
239 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
240 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
241 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
3d6392cf JA |
242 | |
243 | return 0; | |
244 | } | |
3d6392cf | 245 | |
41e1703b FT |
246 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
247 | struct bio *bio) | |
3d6392cf | 248 | { |
82ed4db4 | 249 | struct scsi_request *req = scsi_req(rq); |
91e463c8 | 250 | int r, ret = 0; |
3d6392cf JA |
251 | |
252 | /* | |
253 | * fill in all the output members | |
254 | */ | |
17d5363b CH |
255 | hdr->status = req->result & 0xff; |
256 | hdr->masked_status = status_byte(req->result); | |
257 | hdr->msg_status = msg_byte(req->result); | |
258 | hdr->host_status = host_byte(req->result); | |
259 | hdr->driver_status = driver_byte(req->result); | |
3d6392cf JA |
260 | hdr->info = 0; |
261 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) | |
262 | hdr->info |= SG_INFO_CHECK; | |
82ed4db4 | 263 | hdr->resid = req->resid_len; |
3d6392cf JA |
264 | hdr->sb_len_wr = 0; |
265 | ||
82ed4db4 CH |
266 | if (req->sense_len && hdr->sbp) { |
267 | int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); | |
3d6392cf | 268 | |
82ed4db4 | 269 | if (!copy_to_user(hdr->sbp, req->sense, len)) |
3d6392cf JA |
270 | hdr->sb_len_wr = len; |
271 | else | |
272 | ret = -EFAULT; | |
273 | } | |
274 | ||
91e463c8 FT |
275 | r = blk_rq_unmap_user(bio); |
276 | if (!ret) | |
277 | ret = r; | |
3d6392cf | 278 | |
1cd96c24 | 279 | return ret; |
3d6392cf | 280 | } |
3d6392cf | 281 | |
5842e51f AV |
282 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
283 | struct sg_io_hdr *hdr, fmode_t mode) | |
1da177e4 | 284 | { |
3d6392cf | 285 | unsigned long start_time; |
e0ce0eac KO |
286 | ssize_t ret = 0; |
287 | int writing = 0; | |
d1515613 | 288 | int at_head = 0; |
1da177e4 | 289 | struct request *rq; |
82ed4db4 | 290 | struct scsi_request *req; |
77d172ce | 291 | struct bio *bio; |
1da177e4 LT |
292 | |
293 | if (hdr->interface_id != 'S') | |
294 | return -EINVAL; | |
1da177e4 | 295 | |
ae03bf63 | 296 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
1da177e4 LT |
297 | return -EIO; |
298 | ||
f1970baf | 299 | if (hdr->dxfer_len) |
1da177e4 LT |
300 | switch (hdr->dxfer_direction) { |
301 | default: | |
302 | return -EINVAL; | |
1da177e4 LT |
303 | case SG_DXFER_TO_DEV: |
304 | writing = 1; | |
305 | break; | |
616e8a09 | 306 | case SG_DXFER_TO_FROM_DEV: |
1da177e4 | 307 | case SG_DXFER_FROM_DEV: |
1da177e4 LT |
308 | break; |
309 | } | |
d1515613 DG |
310 | if (hdr->flags & SG_FLAG_Q_AT_HEAD) |
311 | at_head = 1; | |
1da177e4 | 312 | |
a57821ca | 313 | ret = -ENOMEM; |
ff005a06 | 314 | rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 JL |
315 | if (IS_ERR(rq)) |
316 | return PTR_ERR(rq); | |
82ed4db4 | 317 | req = scsi_req(rq); |
1da177e4 | 318 | |
a57821ca | 319 | if (hdr->cmd_len > BLK_MAX_CDB) { |
82ed4db4 CH |
320 | req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); |
321 | if (!req->cmd) | |
a57821ca | 322 | goto out_put_request; |
3d6392cf | 323 | } |
1da177e4 | 324 | |
2c4cffe8 PB |
325 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
326 | if (ret < 0) | |
a57821ca | 327 | goto out_free_cdb; |
1da177e4 | 328 | |
d19d7446 | 329 | ret = 0; |
0e75f906 | 330 | if (hdr->iovec_count) { |
26e49cfc | 331 | struct iov_iter i; |
17a05cca | 332 | struct iovec *iov = NULL; |
0e75f906 | 333 | |
89cd35c5 CH |
334 | ret = import_iovec(rq_data_dir(rq), hdr->dxferp, |
335 | hdr->iovec_count, 0, &iov, &i); | |
e272b89f | 336 | if (ret < 0) |
a57821ca | 337 | goto out_free_cdb; |
0e75f906 | 338 | |
25636e28 | 339 | /* SG_IO howto says that the shorter of the two wins */ |
e272b89f | 340 | iov_iter_truncate(&i, hdr->dxfer_len); |
25636e28 | 341 | |
26e49cfc | 342 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
e0ce0eac | 343 | kfree(iov); |
0e75f906 | 344 | } else if (hdr->dxfer_len) |
152e283f | 345 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
a3bce90e | 346 | GFP_KERNEL); |
0e75f906 MC |
347 | |
348 | if (ret) | |
a57821ca | 349 | goto out_free_cdb; |
0e75f906 | 350 | |
77d172ce | 351 | bio = rq->bio; |
64c7f1d1 | 352 | req->retries = 0; |
01840f9c | 353 | |
1da177e4 LT |
354 | start_time = jiffies; |
355 | ||
356 | /* ignore return value. All information is passed back to caller | |
357 | * (if he doesn't check that is his problem). | |
358 | * N.B. a non-zero SCSI status is _not_ necessarily an error. | |
359 | */ | |
684da762 | 360 | blk_execute_rq(bd_disk, rq, at_head); |
1da177e4 | 361 | |
24bb8fb9 | 362 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
1da177e4 | 363 | |
2cada584 | 364 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
a57821ca CH |
365 | |
366 | out_free_cdb: | |
82ed4db4 | 367 | scsi_req_free_cmd(req); |
a57821ca | 368 | out_put_request: |
dd1cab95 JA |
369 | blk_put_request(rq); |
370 | return ret; | |
1da177e4 LT |
371 | } |
372 | ||
21b2f0c8 CH |
373 | /** |
374 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl | |
21b2f0c8 CH |
375 | * @q: request queue to send scsi commands down |
376 | * @disk: gendisk to operate on (option) | |
aa98192d BVA |
377 | * @mode: mode used to open the file through which the ioctl has been |
378 | * submitted | |
21b2f0c8 CH |
379 | * @sic: userspace structure describing the command to perform |
380 | * | |
381 | * Send down the scsi command described by @sic to the device below | |
382 | * the request queue @q. If @file is non-NULL it's used to perform | |
383 | * fine-grained permission checks that allow users to send down | |
384 | * non-destructive SCSI commands. If the caller has a struct gendisk | |
385 | * available it should be passed in as @disk to allow the low level | |
386 | * driver to use the information contained in it. A non-NULL @disk | |
387 | * is only allowed if the caller knows that the low level driver doesn't | |
388 | * need it (e.g. in the scsi subsystem). | |
389 | * | |
390 | * Notes: | |
391 | * - This interface is deprecated - users should use the SG_IO | |
392 | * interface instead, as this is a more flexible approach to | |
393 | * performing SCSI commands on a device. | |
394 | * - The SCSI command length is determined by examining the 1st byte | |
395 | * of the given command. There is no way to override this. | |
396 | * - Data transfers are limited to PAGE_SIZE | |
397 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to | |
398 | * accommodate the sense buffer when an error occurs. | |
399 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that | |
400 | * old code will not be surprised. | |
401 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive | |
402 | * a negative return and the Unix error code in 'errno'. | |
403 | * If the SCSI command succeeds then 0 is returned. | |
404 | * Positive numbers returned are the compacted SCSI error codes (4 | |
405 | * bytes in one int) where the lowest byte is the SCSI status. | |
406 | */ | |
e915e872 AV |
407 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
408 | struct scsi_ioctl_command __user *sic) | |
1da177e4 | 409 | { |
aa98192d | 410 | enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */ |
1da177e4 | 411 | struct request *rq; |
82ed4db4 | 412 | struct scsi_request *req; |
aeb5d727 | 413 | int err; |
1da177e4 | 414 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
82ed4db4 | 415 | char *buffer = NULL; |
1da177e4 | 416 | |
21b2f0c8 CH |
417 | if (!sic) |
418 | return -EINVAL; | |
419 | ||
1da177e4 LT |
420 | /* |
421 | * get in an out lengths, verify they don't exceed a page worth of data | |
422 | */ | |
423 | if (get_user(in_len, &sic->inlen)) | |
424 | return -EFAULT; | |
425 | if (get_user(out_len, &sic->outlen)) | |
426 | return -EFAULT; | |
427 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) | |
428 | return -EINVAL; | |
429 | if (get_user(opcode, sic->data)) | |
430 | return -EFAULT; | |
431 | ||
432 | bytes = max(in_len, out_len); | |
433 | if (bytes) { | |
dd00cc48 | 434 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
1da177e4 LT |
435 | if (!buffer) |
436 | return -ENOMEM; | |
437 | ||
1da177e4 LT |
438 | } |
439 | ||
ff005a06 | 440 | rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 JL |
441 | if (IS_ERR(rq)) { |
442 | err = PTR_ERR(rq); | |
92697dc9 | 443 | goto error_free_buffer; |
eb571eea | 444 | } |
82ed4db4 | 445 | req = scsi_req(rq); |
1da177e4 LT |
446 | |
447 | cmdlen = COMMAND_SIZE(opcode); | |
448 | ||
449 | /* | |
450 | * get command and data to send to device, if any | |
451 | */ | |
452 | err = -EFAULT; | |
82ed4db4 CH |
453 | req->cmd_len = cmdlen; |
454 | if (copy_from_user(req->cmd, sic->data, cmdlen)) | |
1da177e4 LT |
455 | goto error; |
456 | ||
21b2f0c8 | 457 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
1da177e4 LT |
458 | goto error; |
459 | ||
f00c4d80 | 460 | err = blk_verify_command(req->cmd, mode); |
1da177e4 LT |
461 | if (err) |
462 | goto error; | |
463 | ||
21b2f0c8 | 464 | /* default. possible overriden later */ |
64c7f1d1 | 465 | req->retries = 5; |
21b2f0c8 | 466 | |
1da177e4 | 467 | switch (opcode) { |
21b2f0c8 CH |
468 | case SEND_DIAGNOSTIC: |
469 | case FORMAT_UNIT: | |
470 | rq->timeout = FORMAT_UNIT_TIMEOUT; | |
64c7f1d1 | 471 | req->retries = 1; |
21b2f0c8 CH |
472 | break; |
473 | case START_STOP: | |
474 | rq->timeout = START_STOP_TIMEOUT; | |
475 | break; | |
476 | case MOVE_MEDIUM: | |
477 | rq->timeout = MOVE_MEDIUM_TIMEOUT; | |
478 | break; | |
479 | case READ_ELEMENT_STATUS: | |
480 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; | |
481 | break; | |
482 | case READ_DEFECT_DATA: | |
483 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; | |
64c7f1d1 | 484 | req->retries = 1; |
21b2f0c8 CH |
485 | break; |
486 | default: | |
3d6392cf | 487 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
21b2f0c8 CH |
488 | break; |
489 | } | |
490 | ||
0eb0b63c | 491 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) { |
21b2f0c8 | 492 | err = DRIVER_ERROR << 24; |
84ce0f0e | 493 | goto error; |
1da177e4 LT |
494 | } |
495 | ||
684da762 | 496 | blk_execute_rq(disk, rq, 0); |
21b2f0c8 | 497 | |
17d5363b | 498 | err = req->result & 0xff; /* only 8 bit SCSI status */ |
1da177e4 | 499 | if (err) { |
82ed4db4 CH |
500 | if (req->sense_len && req->sense) { |
501 | bytes = (OMAX_SB_LEN > req->sense_len) ? | |
502 | req->sense_len : OMAX_SB_LEN; | |
503 | if (copy_to_user(sic->data, req->sense, bytes)) | |
1da177e4 LT |
504 | err = -EFAULT; |
505 | } | |
506 | } else { | |
507 | if (copy_to_user(sic->data, buffer, out_len)) | |
508 | err = -EFAULT; | |
509 | } | |
510 | ||
511 | error: | |
92697dc9 TB |
512 | blk_put_request(rq); |
513 | ||
514 | error_free_buffer: | |
eb571eea | 515 | kfree(buffer); |
92697dc9 | 516 | |
1da177e4 LT |
517 | return err; |
518 | } | |
21b2f0c8 | 519 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
f98d2dfd BC |
520 | |
521 | /* Send basic block requests */ | |
165125e1 JA |
522 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
523 | int cmd, int data) | |
f98d2dfd BC |
524 | { |
525 | struct request *rq; | |
526 | int err; | |
527 | ||
ff005a06 | 528 | rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0); |
a492f075 JL |
529 | if (IS_ERR(rq)) |
530 | return PTR_ERR(rq); | |
3d6392cf | 531 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
82ed4db4 CH |
532 | scsi_req(rq)->cmd[0] = cmd; |
533 | scsi_req(rq)->cmd[4] = data; | |
534 | scsi_req(rq)->cmd_len = 6; | |
684da762 | 535 | blk_execute_rq(bd_disk, rq, 0); |
17d5363b | 536 | err = scsi_req(rq)->result ? -EIO : 0; |
f98d2dfd BC |
537 | blk_put_request(rq); |
538 | ||
539 | return err; | |
540 | } | |
541 | ||
165125e1 JA |
542 | static inline int blk_send_start_stop(struct request_queue *q, |
543 | struct gendisk *bd_disk, int data) | |
f98d2dfd BC |
544 | { |
545 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); | |
546 | } | |
547 | ||
98aaaec4 AB |
548 | int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp) |
549 | { | |
550 | #ifdef CONFIG_COMPAT | |
551 | if (in_compat_syscall()) { | |
552 | struct compat_sg_io_hdr hdr32 = { | |
553 | .interface_id = hdr->interface_id, | |
554 | .dxfer_direction = hdr->dxfer_direction, | |
555 | .cmd_len = hdr->cmd_len, | |
556 | .mx_sb_len = hdr->mx_sb_len, | |
557 | .iovec_count = hdr->iovec_count, | |
558 | .dxfer_len = hdr->dxfer_len, | |
559 | .dxferp = (uintptr_t)hdr->dxferp, | |
560 | .cmdp = (uintptr_t)hdr->cmdp, | |
561 | .sbp = (uintptr_t)hdr->sbp, | |
562 | .timeout = hdr->timeout, | |
563 | .flags = hdr->flags, | |
564 | .pack_id = hdr->pack_id, | |
565 | .usr_ptr = (uintptr_t)hdr->usr_ptr, | |
566 | .status = hdr->status, | |
567 | .masked_status = hdr->masked_status, | |
568 | .msg_status = hdr->msg_status, | |
569 | .sb_len_wr = hdr->sb_len_wr, | |
570 | .host_status = hdr->host_status, | |
571 | .driver_status = hdr->driver_status, | |
572 | .resid = hdr->resid, | |
573 | .duration = hdr->duration, | |
574 | .info = hdr->info, | |
575 | }; | |
576 | ||
577 | if (copy_to_user(argp, &hdr32, sizeof(hdr32))) | |
578 | return -EFAULT; | |
579 | ||
580 | return 0; | |
581 | } | |
582 | #endif | |
583 | ||
584 | if (copy_to_user(argp, hdr, sizeof(*hdr))) | |
585 | return -EFAULT; | |
586 | ||
587 | return 0; | |
588 | } | |
589 | EXPORT_SYMBOL(put_sg_io_hdr); | |
590 | ||
591 | int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp) | |
592 | { | |
593 | #ifdef CONFIG_COMPAT | |
594 | struct compat_sg_io_hdr hdr32; | |
595 | ||
596 | if (in_compat_syscall()) { | |
597 | if (copy_from_user(&hdr32, argp, sizeof(hdr32))) | |
598 | return -EFAULT; | |
599 | ||
600 | *hdr = (struct sg_io_hdr) { | |
601 | .interface_id = hdr32.interface_id, | |
602 | .dxfer_direction = hdr32.dxfer_direction, | |
603 | .cmd_len = hdr32.cmd_len, | |
604 | .mx_sb_len = hdr32.mx_sb_len, | |
605 | .iovec_count = hdr32.iovec_count, | |
606 | .dxfer_len = hdr32.dxfer_len, | |
607 | .dxferp = compat_ptr(hdr32.dxferp), | |
608 | .cmdp = compat_ptr(hdr32.cmdp), | |
609 | .sbp = compat_ptr(hdr32.sbp), | |
610 | .timeout = hdr32.timeout, | |
611 | .flags = hdr32.flags, | |
612 | .pack_id = hdr32.pack_id, | |
613 | .usr_ptr = compat_ptr(hdr32.usr_ptr), | |
614 | .status = hdr32.status, | |
615 | .masked_status = hdr32.masked_status, | |
616 | .msg_status = hdr32.msg_status, | |
617 | .sb_len_wr = hdr32.sb_len_wr, | |
618 | .host_status = hdr32.host_status, | |
619 | .driver_status = hdr32.driver_status, | |
620 | .resid = hdr32.resid, | |
621 | .duration = hdr32.duration, | |
622 | .info = hdr32.info, | |
623 | }; | |
624 | ||
625 | return 0; | |
626 | } | |
627 | #endif | |
628 | ||
629 | if (copy_from_user(hdr, argp, sizeof(*hdr))) | |
630 | return -EFAULT; | |
631 | ||
632 | return 0; | |
633 | } | |
634 | EXPORT_SYMBOL(get_sg_io_hdr); | |
635 | ||
f3ee6e63 AB |
636 | #ifdef CONFIG_COMPAT |
637 | struct compat_cdrom_generic_command { | |
638 | unsigned char cmd[CDROM_PACKET_SIZE]; | |
639 | compat_caddr_t buffer; | |
640 | compat_uint_t buflen; | |
641 | compat_int_t stat; | |
642 | compat_caddr_t sense; | |
643 | unsigned char data_direction; | |
6d53a9fe | 644 | unsigned char pad[3]; |
f3ee6e63 AB |
645 | compat_int_t quiet; |
646 | compat_int_t timeout; | |
f5ace5ef | 647 | compat_caddr_t unused; |
f3ee6e63 AB |
648 | }; |
649 | #endif | |
650 | ||
651 | static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc, | |
652 | const void __user *arg) | |
653 | { | |
654 | #ifdef CONFIG_COMPAT | |
655 | if (in_compat_syscall()) { | |
656 | struct compat_cdrom_generic_command cgc32; | |
657 | ||
658 | if (copy_from_user(&cgc32, arg, sizeof(cgc32))) | |
659 | return -EFAULT; | |
660 | ||
661 | *cgc = (struct cdrom_generic_command) { | |
662 | .buffer = compat_ptr(cgc32.buffer), | |
663 | .buflen = cgc32.buflen, | |
664 | .stat = cgc32.stat, | |
665 | .sense = compat_ptr(cgc32.sense), | |
666 | .data_direction = cgc32.data_direction, | |
667 | .quiet = cgc32.quiet, | |
668 | .timeout = cgc32.timeout, | |
f5ace5ef | 669 | .unused = compat_ptr(cgc32.unused), |
f3ee6e63 AB |
670 | }; |
671 | memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE); | |
672 | return 0; | |
673 | } | |
674 | #endif | |
675 | if (copy_from_user(cgc, arg, sizeof(*cgc))) | |
676 | return -EFAULT; | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
681 | static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc, | |
682 | void __user *arg) | |
683 | { | |
684 | #ifdef CONFIG_COMPAT | |
685 | if (in_compat_syscall()) { | |
686 | struct compat_cdrom_generic_command cgc32 = { | |
687 | .buffer = (uintptr_t)(cgc->buffer), | |
688 | .buflen = cgc->buflen, | |
689 | .stat = cgc->stat, | |
690 | .sense = (uintptr_t)(cgc->sense), | |
691 | .data_direction = cgc->data_direction, | |
692 | .quiet = cgc->quiet, | |
693 | .timeout = cgc->timeout, | |
f5ace5ef | 694 | .unused = (uintptr_t)(cgc->unused), |
f3ee6e63 AB |
695 | }; |
696 | memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE); | |
697 | ||
698 | if (copy_to_user(arg, &cgc32, sizeof(cgc32))) | |
699 | return -EFAULT; | |
700 | ||
701 | return 0; | |
702 | } | |
703 | #endif | |
704 | if (copy_to_user(arg, cgc, sizeof(*cgc))) | |
705 | return -EFAULT; | |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | static int scsi_cdrom_send_packet(struct request_queue *q, | |
711 | struct gendisk *bd_disk, | |
712 | fmode_t mode, void __user *arg) | |
713 | { | |
714 | struct cdrom_generic_command cgc; | |
715 | struct sg_io_hdr hdr; | |
716 | int err; | |
717 | ||
718 | err = scsi_get_cdrom_generic_arg(&cgc, arg); | |
719 | if (err) | |
720 | return err; | |
721 | ||
722 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); | |
723 | memset(&hdr, 0, sizeof(hdr)); | |
724 | hdr.interface_id = 'S'; | |
725 | hdr.cmd_len = sizeof(cgc.cmd); | |
726 | hdr.dxfer_len = cgc.buflen; | |
727 | switch (cgc.data_direction) { | |
728 | case CGC_DATA_UNKNOWN: | |
729 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; | |
730 | break; | |
731 | case CGC_DATA_WRITE: | |
732 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
733 | break; | |
734 | case CGC_DATA_READ: | |
735 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
736 | break; | |
737 | case CGC_DATA_NONE: | |
738 | hdr.dxfer_direction = SG_DXFER_NONE; | |
739 | break; | |
740 | default: | |
741 | return -EINVAL; | |
742 | } | |
743 | ||
744 | hdr.dxferp = cgc.buffer; | |
745 | hdr.sbp = cgc.sense; | |
746 | if (hdr.sbp) | |
747 | hdr.mx_sb_len = sizeof(struct request_sense); | |
748 | hdr.timeout = jiffies_to_msecs(cgc.timeout); | |
749 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; | |
750 | hdr.cmd_len = sizeof(cgc.cmd); | |
751 | ||
752 | err = sg_io(q, bd_disk, &hdr, mode); | |
753 | if (err == -EFAULT) | |
754 | return -EFAULT; | |
755 | ||
756 | if (hdr.status) | |
757 | return -EIO; | |
758 | ||
759 | cgc.stat = err; | |
760 | cgc.buflen = hdr.resid; | |
761 | if (scsi_put_cdrom_generic_arg(&cgc, arg)) | |
762 | return -EFAULT; | |
763 | ||
764 | return err; | |
765 | } | |
766 | ||
74f3c8af AV |
767 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
768 | unsigned int cmd, void __user *arg) | |
1da177e4 | 769 | { |
f98d2dfd | 770 | int err; |
1da177e4 | 771 | |
315fceee | 772 | if (!q) |
1da177e4 LT |
773 | return -ENXIO; |
774 | ||
775 | switch (cmd) { | |
776 | /* | |
777 | * new sgv3 interface | |
778 | */ | |
779 | case SG_GET_VERSION_NUM: | |
780 | err = sg_get_version(arg); | |
781 | break; | |
782 | case SCSI_IOCTL_GET_IDLUN: | |
783 | err = scsi_get_idlun(q, arg); | |
784 | break; | |
785 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
786 | err = scsi_get_bus(q, arg); | |
787 | break; | |
788 | case SG_SET_TIMEOUT: | |
789 | err = sg_set_timeout(q, arg); | |
790 | break; | |
791 | case SG_GET_TIMEOUT: | |
792 | err = sg_get_timeout(q); | |
793 | break; | |
794 | case SG_GET_RESERVED_SIZE: | |
795 | err = sg_get_reserved_size(q, arg); | |
796 | break; | |
797 | case SG_SET_RESERVED_SIZE: | |
798 | err = sg_set_reserved_size(q, arg); | |
799 | break; | |
800 | case SG_EMULATED_HOST: | |
801 | err = sg_emulated_host(q, arg); | |
802 | break; | |
803 | case SG_IO: { | |
804 | struct sg_io_hdr hdr; | |
805 | ||
98aaaec4 AB |
806 | err = get_sg_io_hdr(&hdr, arg); |
807 | if (err) | |
1da177e4 | 808 | break; |
74f3c8af | 809 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
810 | if (err == -EFAULT) |
811 | break; | |
812 | ||
98aaaec4 | 813 | if (put_sg_io_hdr(&hdr, arg)) |
1da177e4 LT |
814 | err = -EFAULT; |
815 | break; | |
816 | } | |
f3ee6e63 AB |
817 | case CDROM_SEND_PACKET: |
818 | err = scsi_cdrom_send_packet(q, bd_disk, mode, arg); | |
1da177e4 | 819 | break; |
1da177e4 LT |
820 | |
821 | /* | |
822 | * old junk scsi send command ioctl | |
823 | */ | |
824 | case SCSI_IOCTL_SEND_COMMAND: | |
825 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); | |
826 | err = -EINVAL; | |
827 | if (!arg) | |
828 | break; | |
829 | ||
74f3c8af | 830 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
1da177e4 LT |
831 | break; |
832 | case CDROMCLOSETRAY: | |
f98d2dfd BC |
833 | err = blk_send_start_stop(q, bd_disk, 0x03); |
834 | break; | |
1da177e4 | 835 | case CDROMEJECT: |
f98d2dfd | 836 | err = blk_send_start_stop(q, bd_disk, 0x02); |
1da177e4 LT |
837 | break; |
838 | default: | |
839 | err = -ENOTTY; | |
840 | } | |
841 | ||
1da177e4 LT |
842 | return err; |
843 | } | |
1da177e4 | 844 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
018e0446 | 845 | |
0bfc96cb PB |
846 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
847 | { | |
fa01b1e9 | 848 | if (bd && !bdev_is_partition(bd)) |
0bfc96cb PB |
849 | return 0; |
850 | ||
6d935928 JK |
851 | if (capable(CAP_SYS_RAWIO)) |
852 | return 0; | |
853 | ||
6d935928 | 854 | return -ENOIOCTLCMD; |
0bfc96cb PB |
855 | } |
856 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); | |
857 | ||
577ebb37 PB |
858 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
859 | unsigned int cmd, void __user *arg) | |
860 | { | |
0bfc96cb PB |
861 | int ret; |
862 | ||
863 | ret = scsi_verify_blk_ioctl(bd, cmd); | |
864 | if (ret < 0) | |
865 | return ret; | |
866 | ||
577ebb37 PB |
867 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
868 | } | |
869 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); | |
870 | ||
c8d9cf22 BVA |
871 | /** |
872 | * scsi_req_init - initialize certain fields of a scsi_request structure | |
873 | * @req: Pointer to a scsi_request structure. | |
874 | * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members | |
875 | * of struct scsi_request. | |
876 | */ | |
877 | void scsi_req_init(struct scsi_request *req) | |
82ed4db4 | 878 | { |
82ed4db4 CH |
879 | memset(req->__cmd, 0, sizeof(req->__cmd)); |
880 | req->cmd = req->__cmd; | |
881 | req->cmd_len = BLK_MAX_CDB; | |
882 | req->sense_len = 0; | |
883 | } | |
884 | EXPORT_SYMBOL(scsi_req_init); | |
885 | ||
476d42f1 | 886 | static int __init blk_scsi_ioctl_init(void) |
018e0446 JA |
887 | { |
888 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); | |
889 | return 0; | |
890 | } | |
76da0346 | 891 | fs_initcall(blk_scsi_ioctl_init); |