block: WARN in __blk_put_request() for potential bio leak
[linux-2.6.git] / block / scsi_ioctl.c
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>
24 #include <linux/capability.h>
25 #include <linux/completion.h>
26 #include <linux/cdrom.h>
27 #include <linux/slab.h>
28 #include <linux/times.h>
29 #include <asm/uaccess.h>
30
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_ioctl.h>
33 #include <scsi/scsi_cmnd.h>
34
35 /* Command group 3 is reserved and should never be used.  */
36 const unsigned char scsi_command_size_tbl[8] =
37 {
38         6, 10, 10, 12,
39         16, 12, 10, 10
40 };
41 EXPORT_SYMBOL(scsi_command_size_tbl);
42
43 #include <scsi/sg.h>
44
45 static int sg_get_version(int __user *p)
46 {
47         static const int sg_version_num = 30527;
48         return put_user(sg_version_num, p);
49 }
50
51 static int scsi_get_idlun(struct request_queue *q, int __user *p)
52 {
53         return put_user(0, p);
54 }
55
56 static int scsi_get_bus(struct request_queue *q, int __user *p)
57 {
58         return put_user(0, p);
59 }
60
61 static int sg_get_timeout(struct request_queue *q)
62 {
63         return jiffies_to_clock_t(q->sg_timeout);
64 }
65
66 static int sg_set_timeout(struct request_queue *q, int __user *p)
67 {
68         int timeout, err = get_user(timeout, p);
69
70         if (!err)
71                 q->sg_timeout = clock_t_to_jiffies(timeout);
72
73         return err;
74 }
75
76 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
77 {
78         unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
79
80         return put_user(val, p);
81 }
82
83 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
84 {
85         int size, err = get_user(size, p);
86
87         if (err)
88                 return err;
89
90         if (size < 0)
91                 return -EINVAL;
92         if (size > (q->max_sectors << 9))
93                 size = q->max_sectors << 9;
94
95         q->sg_reserved_size = size;
96         return 0;
97 }
98
99 /*
100  * will always return that we are ATAPI even for a real SCSI drive, I'm not
101  * so sure this is worth doing anything about (why would you care??)
102  */
103 static int sg_emulated_host(struct request_queue *q, int __user *p)
104 {
105         return put_user(1, p);
106 }
107
108 void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
109 {
110         /* Basic read-only commands */
111         __set_bit(TEST_UNIT_READY, filter->read_ok);
112         __set_bit(REQUEST_SENSE, filter->read_ok);
113         __set_bit(READ_6, filter->read_ok);
114         __set_bit(READ_10, filter->read_ok);
115         __set_bit(READ_12, filter->read_ok);
116         __set_bit(READ_16, filter->read_ok);
117         __set_bit(READ_BUFFER, filter->read_ok);
118         __set_bit(READ_DEFECT_DATA, filter->read_ok);
119         __set_bit(READ_CAPACITY, filter->read_ok);
120         __set_bit(READ_LONG, filter->read_ok);
121         __set_bit(INQUIRY, filter->read_ok);
122         __set_bit(MODE_SENSE, filter->read_ok);
123         __set_bit(MODE_SENSE_10, filter->read_ok);
124         __set_bit(LOG_SENSE, filter->read_ok);
125         __set_bit(START_STOP, filter->read_ok);
126         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
127         __set_bit(VERIFY_16, filter->read_ok);
128         __set_bit(REPORT_LUNS, filter->read_ok);
129         __set_bit(SERVICE_ACTION_IN, filter->read_ok);
130         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
131         __set_bit(MAINTENANCE_IN, filter->read_ok);
132         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
133
134         /* Audio CD commands */
135         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
136         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
137         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
138         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
139         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
140
141         /* CD/DVD data reading */
142         __set_bit(GPCMD_READ_CD, filter->read_ok);
143         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
144         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
145         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
146         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
147         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
148         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
149         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
150         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
151         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
152         __set_bit(GPCMD_SCAN, filter->read_ok);
153         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
154         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
155         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
156         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
157         __set_bit(GPCMD_SEEK, filter->read_ok);
158         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
159
160         /* Basic writing commands */
161         __set_bit(WRITE_6, filter->write_ok);
162         __set_bit(WRITE_10, filter->write_ok);
163         __set_bit(WRITE_VERIFY, filter->write_ok);
164         __set_bit(WRITE_12, filter->write_ok);
165         __set_bit(WRITE_VERIFY_12, filter->write_ok);
166         __set_bit(WRITE_16, filter->write_ok);
167         __set_bit(WRITE_LONG, filter->write_ok);
168         __set_bit(WRITE_LONG_2, filter->write_ok);
169         __set_bit(ERASE, filter->write_ok);
170         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
171         __set_bit(MODE_SELECT, filter->write_ok);
172         __set_bit(LOG_SELECT, filter->write_ok);
173         __set_bit(GPCMD_BLANK, filter->write_ok);
174         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
175         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
176         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
177         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
178         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
179         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
180         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
181         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
182         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
183         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
184         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
185         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
186         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
187         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
188         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
189 }
190 EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults);
191
192 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
193                              struct sg_io_hdr *hdr, fmode_t mode)
194 {
195         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
196                 return -EFAULT;
197         if (blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE))
198                 return -EPERM;
199
200         /*
201          * fill in request structure
202          */
203         rq->cmd_len = hdr->cmd_len;
204         rq->cmd_type = REQ_TYPE_BLOCK_PC;
205
206         rq->timeout = msecs_to_jiffies(hdr->timeout);
207         if (!rq->timeout)
208                 rq->timeout = q->sg_timeout;
209         if (!rq->timeout)
210                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
211         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
212                 rq->timeout = BLK_MIN_SG_TIMEOUT;
213
214         return 0;
215 }
216
217 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
218                                  struct bio *bio)
219 {
220         int ret = 0;
221
222         /*
223          * fill in all the output members
224          */
225         hdr->status = rq->errors & 0xff;
226         hdr->masked_status = status_byte(rq->errors);
227         hdr->msg_status = msg_byte(rq->errors);
228         hdr->host_status = host_byte(rq->errors);
229         hdr->driver_status = driver_byte(rq->errors);
230         hdr->info = 0;
231         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
232                 hdr->info |= SG_INFO_CHECK;
233         hdr->resid = rq->data_len;
234         hdr->sb_len_wr = 0;
235
236         if (rq->sense_len && hdr->sbp) {
237                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
238
239                 if (!copy_to_user(hdr->sbp, rq->sense, len))
240                         hdr->sb_len_wr = len;
241                 else
242                         ret = -EFAULT;
243         }
244
245         blk_rq_unmap_user(bio);
246         blk_put_request(rq);
247
248         return ret;
249 }
250
251 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
252                 struct sg_io_hdr *hdr, fmode_t mode)
253 {
254         unsigned long start_time;
255         int writing = 0, ret = 0;
256         struct request *rq;
257         char sense[SCSI_SENSE_BUFFERSIZE];
258         struct bio *bio;
259
260         if (hdr->interface_id != 'S')
261                 return -EINVAL;
262         if (hdr->cmd_len > BLK_MAX_CDB)
263                 return -EINVAL;
264
265         if (hdr->dxfer_len > (q->max_hw_sectors << 9))
266                 return -EIO;
267
268         if (hdr->dxfer_len)
269                 switch (hdr->dxfer_direction) {
270                 default:
271                         return -EINVAL;
272                 case SG_DXFER_TO_DEV:
273                         writing = 1;
274                         break;
275                 case SG_DXFER_TO_FROM_DEV:
276                 case SG_DXFER_FROM_DEV:
277                         break;
278                 }
279
280         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
281         if (!rq)
282                 return -ENOMEM;
283
284         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
285                 blk_put_request(rq);
286                 return -EFAULT;
287         }
288
289         if (hdr->iovec_count) {
290                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
291                 struct sg_iovec *iov;
292
293                 iov = kmalloc(size, GFP_KERNEL);
294                 if (!iov) {
295                         ret = -ENOMEM;
296                         goto out;
297                 }
298
299                 if (copy_from_user(iov, hdr->dxferp, size)) {
300                         kfree(iov);
301                         ret = -EFAULT;
302                         goto out;
303                 }
304
305                 ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
306                                           hdr->dxfer_len, GFP_KERNEL);
307                 kfree(iov);
308         } else if (hdr->dxfer_len)
309                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
310                                       GFP_KERNEL);
311
312         if (ret)
313                 goto out;
314
315         bio = rq->bio;
316         memset(sense, 0, sizeof(sense));
317         rq->sense = sense;
318         rq->sense_len = 0;
319         rq->retries = 0;
320
321         start_time = jiffies;
322
323         /* ignore return value. All information is passed back to caller
324          * (if he doesn't check that is his problem).
325          * N.B. a non-zero SCSI status is _not_ necessarily an error.
326          */
327         blk_execute_rq(q, bd_disk, rq, 0);
328
329         hdr->duration = jiffies_to_msecs(jiffies - start_time);
330
331         return blk_complete_sghdr_rq(rq, hdr, bio);
332 out:
333         blk_put_request(rq);
334         return ret;
335 }
336
337 /**
338  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
339  * @file:       file this ioctl operates on (optional)
340  * @q:          request queue to send scsi commands down
341  * @disk:       gendisk to operate on (option)
342  * @sic:        userspace structure describing the command to perform
343  *
344  * Send down the scsi command described by @sic to the device below
345  * the request queue @q.  If @file is non-NULL it's used to perform
346  * fine-grained permission checks that allow users to send down
347  * non-destructive SCSI commands.  If the caller has a struct gendisk
348  * available it should be passed in as @disk to allow the low level
349  * driver to use the information contained in it.  A non-NULL @disk
350  * is only allowed if the caller knows that the low level driver doesn't
351  * need it (e.g. in the scsi subsystem).
352  *
353  * Notes:
354  *   -  This interface is deprecated - users should use the SG_IO
355  *      interface instead, as this is a more flexible approach to
356  *      performing SCSI commands on a device.
357  *   -  The SCSI command length is determined by examining the 1st byte
358  *      of the given command. There is no way to override this.
359  *   -  Data transfers are limited to PAGE_SIZE
360  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
361  *      accommodate the sense buffer when an error occurs.
362  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
363  *      old code will not be surprised.
364  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
365  *      a negative return and the Unix error code in 'errno'.
366  *      If the SCSI command succeeds then 0 is returned.
367  *      Positive numbers returned are the compacted SCSI error codes (4
368  *      bytes in one int) where the lowest byte is the SCSI status.
369  */
370 #define OMAX_SB_LEN 16          /* For backward compatibility */
371 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
372                 struct scsi_ioctl_command __user *sic)
373 {
374         struct request *rq;
375         int err;
376         unsigned int in_len, out_len, bytes, opcode, cmdlen;
377         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
378
379         if (!sic)
380                 return -EINVAL;
381
382         /*
383          * get in an out lengths, verify they don't exceed a page worth of data
384          */
385         if (get_user(in_len, &sic->inlen))
386                 return -EFAULT;
387         if (get_user(out_len, &sic->outlen))
388                 return -EFAULT;
389         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
390                 return -EINVAL;
391         if (get_user(opcode, sic->data))
392                 return -EFAULT;
393
394         bytes = max(in_len, out_len);
395         if (bytes) {
396                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
397                 if (!buffer)
398                         return -ENOMEM;
399
400         }
401
402         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
403
404         cmdlen = COMMAND_SIZE(opcode);
405
406         /*
407          * get command and data to send to device, if any
408          */
409         err = -EFAULT;
410         rq->cmd_len = cmdlen;
411         if (copy_from_user(rq->cmd, sic->data, cmdlen))
412                 goto error;
413
414         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
415                 goto error;
416
417         err = blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE);
418         if (err)
419                 goto error;
420
421         /* default.  possible overriden later */
422         rq->retries = 5;
423
424         switch (opcode) {
425         case SEND_DIAGNOSTIC:
426         case FORMAT_UNIT:
427                 rq->timeout = FORMAT_UNIT_TIMEOUT;
428                 rq->retries = 1;
429                 break;
430         case START_STOP:
431                 rq->timeout = START_STOP_TIMEOUT;
432                 break;
433         case MOVE_MEDIUM:
434                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
435                 break;
436         case READ_ELEMENT_STATUS:
437                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
438                 break;
439         case READ_DEFECT_DATA:
440                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
441                 rq->retries = 1;
442                 break;
443         default:
444                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
445                 break;
446         }
447
448         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
449                 err = DRIVER_ERROR << 24;
450                 goto out;
451         }
452
453         memset(sense, 0, sizeof(sense));
454         rq->sense = sense;
455         rq->sense_len = 0;
456         rq->cmd_type = REQ_TYPE_BLOCK_PC;
457
458         blk_execute_rq(q, disk, rq, 0);
459
460 out:
461         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
462         if (err) {
463                 if (rq->sense_len && rq->sense) {
464                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
465                                 rq->sense_len : OMAX_SB_LEN;
466                         if (copy_to_user(sic->data, rq->sense, bytes))
467                                 err = -EFAULT;
468                 }
469         } else {
470                 if (copy_to_user(sic->data, buffer, out_len))
471                         err = -EFAULT;
472         }
473         
474 error:
475         kfree(buffer);
476         blk_put_request(rq);
477         return err;
478 }
479 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
480
481 /* Send basic block requests */
482 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
483                               int cmd, int data)
484 {
485         struct request *rq;
486         int err;
487
488         rq = blk_get_request(q, WRITE, __GFP_WAIT);
489         rq->cmd_type = REQ_TYPE_BLOCK_PC;
490         rq->data = NULL;
491         rq->data_len = 0;
492         rq->extra_len = 0;
493         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
494         rq->cmd[0] = cmd;
495         rq->cmd[4] = data;
496         rq->cmd_len = 6;
497         err = blk_execute_rq(q, bd_disk, rq, 0);
498         blk_put_request(rq);
499
500         return err;
501 }
502
503 static inline int blk_send_start_stop(struct request_queue *q,
504                                       struct gendisk *bd_disk, int data)
505 {
506         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
507 }
508
509 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
510                    unsigned int cmd, void __user *arg)
511 {
512         int err;
513
514         if (!q || blk_get_queue(q))
515                 return -ENXIO;
516
517         switch (cmd) {
518                 /*
519                  * new sgv3 interface
520                  */
521                 case SG_GET_VERSION_NUM:
522                         err = sg_get_version(arg);
523                         break;
524                 case SCSI_IOCTL_GET_IDLUN:
525                         err = scsi_get_idlun(q, arg);
526                         break;
527                 case SCSI_IOCTL_GET_BUS_NUMBER:
528                         err = scsi_get_bus(q, arg);
529                         break;
530                 case SG_SET_TIMEOUT:
531                         err = sg_set_timeout(q, arg);
532                         break;
533                 case SG_GET_TIMEOUT:
534                         err = sg_get_timeout(q);
535                         break;
536                 case SG_GET_RESERVED_SIZE:
537                         err = sg_get_reserved_size(q, arg);
538                         break;
539                 case SG_SET_RESERVED_SIZE:
540                         err = sg_set_reserved_size(q, arg);
541                         break;
542                 case SG_EMULATED_HOST:
543                         err = sg_emulated_host(q, arg);
544                         break;
545                 case SG_IO: {
546                         struct sg_io_hdr hdr;
547
548                         err = -EFAULT;
549                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
550                                 break;
551                         err = sg_io(q, bd_disk, &hdr, mode);
552                         if (err == -EFAULT)
553                                 break;
554
555                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
556                                 err = -EFAULT;
557                         break;
558                 }
559                 case CDROM_SEND_PACKET: {
560                         struct cdrom_generic_command cgc;
561                         struct sg_io_hdr hdr;
562
563                         err = -EFAULT;
564                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
565                                 break;
566                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
567                         memset(&hdr, 0, sizeof(hdr));
568                         hdr.interface_id = 'S';
569                         hdr.cmd_len = sizeof(cgc.cmd);
570                         hdr.dxfer_len = cgc.buflen;
571                         err = 0;
572                         switch (cgc.data_direction) {
573                                 case CGC_DATA_UNKNOWN:
574                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
575                                         break;
576                                 case CGC_DATA_WRITE:
577                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
578                                         break;
579                                 case CGC_DATA_READ:
580                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
581                                         break;
582                                 case CGC_DATA_NONE:
583                                         hdr.dxfer_direction = SG_DXFER_NONE;
584                                         break;
585                                 default:
586                                         err = -EINVAL;
587                         }
588                         if (err)
589                                 break;
590
591                         hdr.dxferp = cgc.buffer;
592                         hdr.sbp = cgc.sense;
593                         if (hdr.sbp)
594                                 hdr.mx_sb_len = sizeof(struct request_sense);
595                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
596                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
597                         hdr.cmd_len = sizeof(cgc.cmd);
598
599                         err = sg_io(q, bd_disk, &hdr, mode);
600                         if (err == -EFAULT)
601                                 break;
602
603                         if (hdr.status)
604                                 err = -EIO;
605
606                         cgc.stat = err;
607                         cgc.buflen = hdr.resid;
608                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
609                                 err = -EFAULT;
610
611                         break;
612                 }
613
614                 /*
615                  * old junk scsi send command ioctl
616                  */
617                 case SCSI_IOCTL_SEND_COMMAND:
618                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
619                         err = -EINVAL;
620                         if (!arg)
621                                 break;
622
623                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
624                         break;
625                 case CDROMCLOSETRAY:
626                         err = blk_send_start_stop(q, bd_disk, 0x03);
627                         break;
628                 case CDROMEJECT:
629                         err = blk_send_start_stop(q, bd_disk, 0x02);
630                         break;
631                 default:
632                         err = -ENOTTY;
633         }
634
635         blk_put_queue(q);
636         return err;
637 }
638
639 EXPORT_SYMBOL(scsi_cmd_ioctl);