treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers
[sfrench/cifs-2.6.git] / block / scsi_ioctl.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
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>
10 #include <linux/capability.h>
11 #include <linux/completion.h>
12 #include <linux/cdrom.h>
13 #include <linux/ratelimit.h>
14 #include <linux/slab.h>
15 #include <linux/times.h>
16 #include <linux/uio.h>
17 #include <linux/uaccess.h>
18
19 #include <scsi/scsi.h>
20 #include <scsi/scsi_ioctl.h>
21 #include <scsi/scsi_cmnd.h>
22
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];
26 };
27
28 static struct blk_cmd_filter blk_default_cmd_filter;
29
30 /* Command group 3 is reserved and should never be used.  */
31 const unsigned char scsi_command_size_tbl[8] =
32 {
33         6, 10, 10, 12,
34         16, 12, 10, 10
35 };
36 EXPORT_SYMBOL(scsi_command_size_tbl);
37
38 #include <scsi/sg.h>
39
40 static int sg_get_version(int __user *p)
41 {
42         static const int sg_version_num = 30527;
43         return put_user(sg_version_num, p);
44 }
45
46 static int scsi_get_idlun(struct request_queue *q, int __user *p)
47 {
48         return put_user(0, p);
49 }
50
51 static int scsi_get_bus(struct request_queue *q, int __user *p)
52 {
53         return put_user(0, p);
54 }
55
56 static int sg_get_timeout(struct request_queue *q)
57 {
58         return jiffies_to_clock_t(q->sg_timeout);
59 }
60
61 static int sg_set_timeout(struct request_queue *q, int __user *p)
62 {
63         int timeout, err = get_user(timeout, p);
64
65         if (!err)
66                 q->sg_timeout = clock_t_to_jiffies(timeout);
67
68         return err;
69 }
70
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
80 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
81 {
82         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
83
84         return put_user(val, p);
85 }
86
87 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
88 {
89         int size, err = get_user(size, p);
90
91         if (err)
92                 return err;
93
94         if (size < 0)
95                 return -EINVAL;
96
97         q->sg_reserved_size = min(size, max_sectors_bytes(q));
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  */
105 static int sg_emulated_host(struct request_queue *q, int __user *p)
106 {
107         return put_user(1, p);
108 }
109
110 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
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);
131         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
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);
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);
174         __set_bit(ERASE, filter->write_ok);
175         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
176         __set_bit(MODE_SELECT, filter->write_ok);
177         __set_bit(LOG_SELECT, filter->write_ok);
178         __set_bit(GPCMD_BLANK, filter->write_ok);
179         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
180         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
181         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
182         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
183         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
184         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
185         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
186         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
187         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
188         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
189         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
190         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
191         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
192         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
193         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
194 }
195
196 int blk_verify_command(unsigned char *cmd, fmode_t mode)
197 {
198         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
199
200         /* root can do any command. */
201         if (capable(CAP_SYS_RAWIO))
202                 return 0;
203
204         /* 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 */
209         if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
210                 return 0;
211
212         return -EPERM;
213 }
214 EXPORT_SYMBOL(blk_verify_command);
215
216 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
217                              struct sg_io_hdr *hdr, fmode_t mode)
218 {
219         struct scsi_request *req = scsi_req(rq);
220
221         if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
222                 return -EFAULT;
223         if (blk_verify_command(req->cmd, mode))
224                 return -EPERM;
225
226         /*
227          * fill in request structure
228          */
229         req->cmd_len = hdr->cmd_len;
230
231         rq->timeout = msecs_to_jiffies(hdr->timeout);
232         if (!rq->timeout)
233                 rq->timeout = q->sg_timeout;
234         if (!rq->timeout)
235                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
236         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
237                 rq->timeout = BLK_MIN_SG_TIMEOUT;
238
239         return 0;
240 }
241
242 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
243                                  struct bio *bio)
244 {
245         struct scsi_request *req = scsi_req(rq);
246         int r, ret = 0;
247
248         /*
249          * fill in all the output members
250          */
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);
256         hdr->info = 0;
257         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
258                 hdr->info |= SG_INFO_CHECK;
259         hdr->resid = req->resid_len;
260         hdr->sb_len_wr = 0;
261
262         if (req->sense_len && hdr->sbp) {
263                 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
264
265                 if (!copy_to_user(hdr->sbp, req->sense, len))
266                         hdr->sb_len_wr = len;
267                 else
268                         ret = -EFAULT;
269         }
270
271         r = blk_rq_unmap_user(bio);
272         if (!ret)
273                 ret = r;
274
275         return ret;
276 }
277
278 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
279                 struct sg_io_hdr *hdr, fmode_t mode)
280 {
281         unsigned long start_time;
282         ssize_t ret = 0;
283         int writing = 0;
284         int at_head = 0;
285         struct request *rq;
286         struct scsi_request *req;
287         struct bio *bio;
288
289         if (hdr->interface_id != 'S')
290                 return -EINVAL;
291
292         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
293                 return -EIO;
294
295         if (hdr->dxfer_len)
296                 switch (hdr->dxfer_direction) {
297                 default:
298                         return -EINVAL;
299                 case SG_DXFER_TO_DEV:
300                         writing = 1;
301                         break;
302                 case SG_DXFER_TO_FROM_DEV:
303                 case SG_DXFER_FROM_DEV:
304                         break;
305                 }
306         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
307                 at_head = 1;
308
309         ret = -ENOMEM;
310         rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
311         if (IS_ERR(rq))
312                 return PTR_ERR(rq);
313         req = scsi_req(rq);
314
315         if (hdr->cmd_len > BLK_MAX_CDB) {
316                 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
317                 if (!req->cmd)
318                         goto out_put_request;
319         }
320
321         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
322         if (ret < 0)
323                 goto out_free_cdb;
324
325         ret = 0;
326         if (hdr->iovec_count) {
327                 struct iov_iter i;
328                 struct iovec *iov = NULL;
329
330                 ret = import_iovec(rq_data_dir(rq),
331                                    hdr->dxferp, hdr->iovec_count,
332                                    0, &iov, &i);
333                 if (ret < 0)
334                         goto out_free_cdb;
335
336                 /* SG_IO howto says that the shorter of the two wins */
337                 iov_iter_truncate(&i, hdr->dxfer_len);
338
339                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
340                 kfree(iov);
341         } else if (hdr->dxfer_len)
342                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
343                                       GFP_KERNEL);
344
345         if (ret)
346                 goto out_free_cdb;
347
348         bio = rq->bio;
349         req->retries = 0;
350
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          */
357         blk_execute_rq(q, bd_disk, rq, at_head);
358
359         hdr->duration = jiffies_to_msecs(jiffies - start_time);
360
361         ret = blk_complete_sghdr_rq(rq, hdr, bio);
362
363 out_free_cdb:
364         scsi_req_free_cmd(req);
365 out_put_request:
366         blk_put_request(rq);
367         return ret;
368 }
369
370 /**
371  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
372  * @q:          request queue to send scsi commands down
373  * @disk:       gendisk to operate on (option)
374  * @mode:       mode used to open the file through which the ioctl has been
375  *              submitted
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  */
404 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
405                 struct scsi_ioctl_command __user *sic)
406 {
407         enum { OMAX_SB_LEN = 16 };      /* For backward compatibility */
408         struct request *rq;
409         struct scsi_request *req;
410         int err;
411         unsigned int in_len, out_len, bytes, opcode, cmdlen;
412         char *buffer = NULL;
413
414         if (!sic)
415                 return -EINVAL;
416
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) {
431                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
432                 if (!buffer)
433                         return -ENOMEM;
434
435         }
436
437         rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
438         if (IS_ERR(rq)) {
439                 err = PTR_ERR(rq);
440                 goto error_free_buffer;
441         }
442         req = scsi_req(rq);
443
444         cmdlen = COMMAND_SIZE(opcode);
445
446         /*
447          * get command and data to send to device, if any
448          */
449         err = -EFAULT;
450         req->cmd_len = cmdlen;
451         if (copy_from_user(req->cmd, sic->data, cmdlen))
452                 goto error;
453
454         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
455                 goto error;
456
457         err = blk_verify_command(req->cmd, mode);
458         if (err)
459                 goto error;
460
461         /* default.  possible overriden later */
462         req->retries = 5;
463
464         switch (opcode) {
465         case SEND_DIAGNOSTIC:
466         case FORMAT_UNIT:
467                 rq->timeout = FORMAT_UNIT_TIMEOUT;
468                 req->retries = 1;
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;
481                 req->retries = 1;
482                 break;
483         default:
484                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
485                 break;
486         }
487
488         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
489                 err = DRIVER_ERROR << 24;
490                 goto error;
491         }
492
493         blk_execute_rq(q, disk, rq, 0);
494
495         err = req->result & 0xff;       /* only 8 bit SCSI status */
496         if (err) {
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))
501                                 err = -EFAULT;
502                 }
503         } else {
504                 if (copy_to_user(sic->data, buffer, out_len))
505                         err = -EFAULT;
506         }
507         
508 error:
509         blk_put_request(rq);
510
511 error_free_buffer:
512         kfree(buffer);
513
514         return err;
515 }
516 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
517
518 /* Send basic block requests */
519 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
520                               int cmd, int data)
521 {
522         struct request *rq;
523         int err;
524
525         rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
526         if (IS_ERR(rq))
527                 return PTR_ERR(rq);
528         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
529         scsi_req(rq)->cmd[0] = cmd;
530         scsi_req(rq)->cmd[4] = data;
531         scsi_req(rq)->cmd_len = 6;
532         blk_execute_rq(q, bd_disk, rq, 0);
533         err = scsi_req(rq)->result ? -EIO : 0;
534         blk_put_request(rq);
535
536         return err;
537 }
538
539 static inline int blk_send_start_stop(struct request_queue *q,
540                                       struct gendisk *bd_disk, int data)
541 {
542         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
543 }
544
545 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
546                    unsigned int cmd, void __user *arg)
547 {
548         int err;
549
550         if (!q)
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;
587                         err = sg_io(q, bd_disk, &hdr, mode);
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);
631                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
632                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
633                         hdr.cmd_len = sizeof(cgc.cmd);
634
635                         err = sg_io(q, bd_disk, &hdr, mode);
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
659                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
660                         break;
661                 case CDROMCLOSETRAY:
662                         err = blk_send_start_stop(q, bd_disk, 0x03);
663                         break;
664                 case CDROMEJECT:
665                         err = blk_send_start_stop(q, bd_disk, 0x02);
666                         break;
667                 default:
668                         err = -ENOTTY;
669         }
670
671         return err;
672 }
673 EXPORT_SYMBOL(scsi_cmd_ioctl);
674
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
680         if (capable(CAP_SYS_RAWIO))
681                 return 0;
682
683         return -ENOIOCTLCMD;
684 }
685 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
686
687 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
688                        unsigned int cmd, void __user *arg)
689 {
690         int ret;
691
692         ret = scsi_verify_blk_ioctl(bd, cmd);
693         if (ret < 0)
694                 return ret;
695
696         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
697 }
698 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
699
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)
707 {
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
715 static int __init blk_scsi_ioctl_init(void)
716 {
717         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
718         return 0;
719 }
720 fs_initcall(blk_scsi_ioctl_init);