bsg: support for full generic block layer SG v3
[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[8] =
37 {
38         6, 10, 10, 12,
39         16, 12, 10, 10
40 };
41
42 EXPORT_SYMBOL(scsi_command_size);
43
44 #include <scsi/sg.h>
45
46 static int sg_get_version(int __user *p)
47 {
48         static const int sg_version_num = 30527;
49         return put_user(sg_version_num, p);
50 }
51
52 static int scsi_get_idlun(request_queue_t *q, int __user *p)
53 {
54         return put_user(0, p);
55 }
56
57 static int scsi_get_bus(request_queue_t *q, int __user *p)
58 {
59         return put_user(0, p);
60 }
61
62 static int sg_get_timeout(request_queue_t *q)
63 {
64         return q->sg_timeout / (HZ / USER_HZ);
65 }
66
67 static int sg_set_timeout(request_queue_t *q, int __user *p)
68 {
69         int timeout, err = get_user(timeout, p);
70
71         if (!err)
72                 q->sg_timeout = timeout * (HZ / USER_HZ);
73
74         return err;
75 }
76
77 static int sg_get_reserved_size(request_queue_t *q, int __user *p)
78 {
79         unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
80
81         return put_user(val, p);
82 }
83
84 static int sg_set_reserved_size(request_queue_t *q, int __user *p)
85 {
86         int size, err = get_user(size, p);
87
88         if (err)
89                 return err;
90
91         if (size < 0)
92                 return -EINVAL;
93         if (size > (q->max_sectors << 9))
94                 size = q->max_sectors << 9;
95
96         q->sg_reserved_size = size;
97         return 0;
98 }
99
100 /*
101  * will always return that we are ATAPI even for a real SCSI drive, I'm not
102  * so sure this is worth doing anything about (why would you care??)
103  */
104 static int sg_emulated_host(request_queue_t *q, int __user *p)
105 {
106         return put_user(1, p);
107 }
108
109 #define CMD_READ_SAFE   0x01
110 #define CMD_WRITE_SAFE  0x02
111 #define CMD_WARNED      0x04
112 #define safe_for_read(cmd)      [cmd] = CMD_READ_SAFE
113 #define safe_for_write(cmd)     [cmd] = CMD_WRITE_SAFE
114
115 static int verify_command(unsigned char *cmd, int has_write_perm)
116 {
117         static unsigned char cmd_type[256] = {
118
119                 /* Basic read-only commands */
120                 safe_for_read(TEST_UNIT_READY),
121                 safe_for_read(REQUEST_SENSE),
122                 safe_for_read(READ_6),
123                 safe_for_read(READ_10),
124                 safe_for_read(READ_12),
125                 safe_for_read(READ_16),
126                 safe_for_read(READ_BUFFER),
127                 safe_for_read(READ_DEFECT_DATA),
128                 safe_for_read(READ_LONG),
129                 safe_for_read(INQUIRY),
130                 safe_for_read(MODE_SENSE),
131                 safe_for_read(MODE_SENSE_10),
132                 safe_for_read(LOG_SENSE),
133                 safe_for_read(START_STOP),
134                 safe_for_read(GPCMD_VERIFY_10),
135                 safe_for_read(VERIFY_16),
136
137                 /* Audio CD commands */
138                 safe_for_read(GPCMD_PLAY_CD),
139                 safe_for_read(GPCMD_PLAY_AUDIO_10),
140                 safe_for_read(GPCMD_PLAY_AUDIO_MSF),
141                 safe_for_read(GPCMD_PLAY_AUDIO_TI),
142                 safe_for_read(GPCMD_PAUSE_RESUME),
143
144                 /* CD/DVD data reading */
145                 safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
146                 safe_for_read(GPCMD_READ_CD),
147                 safe_for_read(GPCMD_READ_CD_MSF),
148                 safe_for_read(GPCMD_READ_DISC_INFO),
149                 safe_for_read(GPCMD_READ_CDVD_CAPACITY),
150                 safe_for_read(GPCMD_READ_DVD_STRUCTURE),
151                 safe_for_read(GPCMD_READ_HEADER),
152                 safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
153                 safe_for_read(GPCMD_READ_SUBCHANNEL),
154                 safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
155                 safe_for_read(GPCMD_REPORT_KEY),
156                 safe_for_read(GPCMD_SCAN),
157                 safe_for_read(GPCMD_GET_CONFIGURATION),
158                 safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
159                 safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
160                 safe_for_read(GPCMD_GET_PERFORMANCE),
161                 safe_for_read(GPCMD_SEEK),
162                 safe_for_read(GPCMD_STOP_PLAY_SCAN),
163
164                 /* Basic writing commands */
165                 safe_for_write(WRITE_6),
166                 safe_for_write(WRITE_10),
167                 safe_for_write(WRITE_VERIFY),
168                 safe_for_write(WRITE_12),
169                 safe_for_write(WRITE_VERIFY_12),
170                 safe_for_write(WRITE_16),
171                 safe_for_write(WRITE_LONG),
172                 safe_for_write(WRITE_LONG_2),
173                 safe_for_write(ERASE),
174                 safe_for_write(GPCMD_MODE_SELECT_10),
175                 safe_for_write(MODE_SELECT),
176                 safe_for_write(LOG_SELECT),
177                 safe_for_write(GPCMD_BLANK),
178                 safe_for_write(GPCMD_CLOSE_TRACK),
179                 safe_for_write(GPCMD_FLUSH_CACHE),
180                 safe_for_write(GPCMD_FORMAT_UNIT),
181                 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
182                 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
183                 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
184                 safe_for_write(GPCMD_SEND_EVENT),
185                 safe_for_write(GPCMD_SEND_KEY),
186                 safe_for_write(GPCMD_SEND_OPC),
187                 safe_for_write(GPCMD_SEND_CUE_SHEET),
188                 safe_for_write(GPCMD_SET_SPEED),
189                 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
190                 safe_for_write(GPCMD_LOAD_UNLOAD),
191                 safe_for_write(GPCMD_SET_STREAMING),
192         };
193         unsigned char type = cmd_type[cmd[0]];
194
195         /* Anybody who can open the device can do a read-safe command */
196         if (type & CMD_READ_SAFE)
197                 return 0;
198
199         /* Write-safe commands just require a writable open.. */
200         if ((type & CMD_WRITE_SAFE) && has_write_perm)
201                 return 0;
202
203         /* And root can do any command.. */
204         if (capable(CAP_SYS_RAWIO))
205                 return 0;
206
207         if (!type) {
208                 cmd_type[cmd[0]] = CMD_WARNED;
209                 printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
210         }
211
212         /* Otherwise fail it with an "Operation not permitted" */
213         return -EPERM;
214 }
215
216 int blk_fill_sghdr_rq(request_queue_t *q, struct request *rq,
217                       struct sg_io_hdr *hdr, int has_write_perm)
218 {
219         memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
220
221         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
222                 return -EFAULT;
223         if (verify_command(rq->cmd, has_write_perm))
224                 return -EPERM;
225
226         /*
227          * fill in request structure
228          */
229         rq->cmd_len = hdr->cmd_len;
230         rq->cmd_type = REQ_TYPE_BLOCK_PC;
231
232         rq->timeout = (hdr->timeout * HZ) / 1000;
233         if (!rq->timeout)
234                 rq->timeout = q->sg_timeout;
235         if (!rq->timeout)
236                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
237
238         return 0;
239 }
240 EXPORT_SYMBOL_GPL(blk_fill_sghdr_rq);
241
242 /*
243  * unmap a request that was previously mapped to this sg_io_hdr. handles
244  * both sg and non-sg sg_io_hdr.
245  */
246 int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
247 {
248         struct bio *bio = rq->bio;
249
250         /*
251          * also releases request
252          */
253         if (!hdr->iovec_count)
254                 return blk_rq_unmap_user(bio, hdr->dxfer_len);
255
256         rq_for_each_bio(bio, rq)
257                 bio_unmap_user(bio);
258
259         blk_put_request(rq);
260         return 0;
261 }
262 EXPORT_SYMBOL_GPL(blk_unmap_sghdr_rq);
263
264 int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
265                           struct bio *bio)
266 {
267         int r, ret = 0;
268
269         /*
270          * fill in all the output members
271          */
272         hdr->status = rq->errors & 0xff;
273         hdr->masked_status = status_byte(rq->errors);
274         hdr->msg_status = msg_byte(rq->errors);
275         hdr->host_status = host_byte(rq->errors);
276         hdr->driver_status = driver_byte(rq->errors);
277         hdr->info = 0;
278         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
279                 hdr->info |= SG_INFO_CHECK;
280         hdr->resid = rq->data_len;
281         hdr->sb_len_wr = 0;
282
283         if (rq->sense_len && hdr->sbp) {
284                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
285
286                 if (!copy_to_user(hdr->sbp, rq->sense, len))
287                         hdr->sb_len_wr = len;
288                 else
289                         ret = -EFAULT;
290         }
291
292         rq->bio = bio;
293         r = blk_unmap_sghdr_rq(rq, hdr);
294         if (ret)
295                 r = ret;
296
297         return r;
298 }
299 EXPORT_SYMBOL_GPL(blk_complete_sghdr_rq);
300
301 static int sg_io(struct file *file, request_queue_t *q,
302                 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
303 {
304         unsigned long start_time;
305         int writing = 0, ret = 0, has_write_perm = 0;
306         struct request *rq;
307         char sense[SCSI_SENSE_BUFFERSIZE];
308         struct bio *bio;
309
310         if (hdr->interface_id != 'S')
311                 return -EINVAL;
312         if (hdr->cmd_len > BLK_MAX_CDB)
313                 return -EINVAL;
314
315         if (hdr->dxfer_len > (q->max_hw_sectors << 9))
316                 return -EIO;
317
318         if (hdr->dxfer_len)
319                 switch (hdr->dxfer_direction) {
320                 default:
321                         return -EINVAL;
322                 case SG_DXFER_TO_DEV:
323                         writing = 1;
324                         break;
325                 case SG_DXFER_TO_FROM_DEV:
326                 case SG_DXFER_FROM_DEV:
327                         break;
328                 }
329
330         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
331         if (!rq)
332                 return -ENOMEM;
333
334         if (file)
335                 has_write_perm = file->f_mode & FMODE_WRITE;
336
337         if (blk_fill_sghdr_rq(q, rq, hdr, has_write_perm)) {
338                 blk_rq_unmap_user(bio, hdr->dxfer_len);
339                 blk_put_request(rq);
340                 return -EFAULT;
341         }
342
343         if (hdr->iovec_count) {
344                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
345                 struct sg_iovec *iov;
346
347                 iov = kmalloc(size, GFP_KERNEL);
348                 if (!iov) {
349                         ret = -ENOMEM;
350                         goto out;
351                 }
352
353                 if (copy_from_user(iov, hdr->dxferp, size)) {
354                         kfree(iov);
355                         ret = -EFAULT;
356                         goto out;
357                 }
358
359                 ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
360                                           hdr->dxfer_len);
361                 kfree(iov);
362         } else if (hdr->dxfer_len)
363                 ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
364
365         if (ret)
366                 goto out;
367
368         bio = rq->bio;
369         memset(sense, 0, sizeof(sense));
370         rq->sense = sense;
371         rq->sense_len = 0;
372         rq->retries = 0;
373
374         start_time = jiffies;
375
376         /* ignore return value. All information is passed back to caller
377          * (if he doesn't check that is his problem).
378          * N.B. a non-zero SCSI status is _not_ necessarily an error.
379          */
380         blk_execute_rq(q, bd_disk, rq, 0);
381
382         hdr->duration = ((jiffies - start_time) * 1000) / HZ;
383
384         return blk_complete_sghdr_rq(rq, hdr, bio);
385 out:
386         blk_put_request(rq);
387         return ret;
388 }
389
390 /**
391  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
392  * @file:       file this ioctl operates on (optional)
393  * @q:          request queue to send scsi commands down
394  * @disk:       gendisk to operate on (option)
395  * @sic:        userspace structure describing the command to perform
396  *
397  * Send down the scsi command described by @sic to the device below
398  * the request queue @q.  If @file is non-NULL it's used to perform
399  * fine-grained permission checks that allow users to send down
400  * non-destructive SCSI commands.  If the caller has a struct gendisk
401  * available it should be passed in as @disk to allow the low level
402  * driver to use the information contained in it.  A non-NULL @disk
403  * is only allowed if the caller knows that the low level driver doesn't
404  * need it (e.g. in the scsi subsystem).
405  *
406  * Notes:
407  *   -  This interface is deprecated - users should use the SG_IO
408  *      interface instead, as this is a more flexible approach to
409  *      performing SCSI commands on a device.
410  *   -  The SCSI command length is determined by examining the 1st byte
411  *      of the given command. There is no way to override this.
412  *   -  Data transfers are limited to PAGE_SIZE
413  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
414  *      accommodate the sense buffer when an error occurs.
415  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
416  *      old code will not be surprised.
417  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
418  *      a negative return and the Unix error code in 'errno'.
419  *      If the SCSI command succeeds then 0 is returned.
420  *      Positive numbers returned are the compacted SCSI error codes (4
421  *      bytes in one int) where the lowest byte is the SCSI status.
422  */
423 #define OMAX_SB_LEN 16          /* For backward compatibility */
424 int sg_scsi_ioctl(struct file *file, struct request_queue *q,
425                   struct gendisk *disk, struct scsi_ioctl_command __user *sic)
426 {
427         struct request *rq;
428         int err;
429         unsigned int in_len, out_len, bytes, opcode, cmdlen;
430         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
431
432         if (!sic)
433                 return -EINVAL;
434
435         /*
436          * get in an out lengths, verify they don't exceed a page worth of data
437          */
438         if (get_user(in_len, &sic->inlen))
439                 return -EFAULT;
440         if (get_user(out_len, &sic->outlen))
441                 return -EFAULT;
442         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
443                 return -EINVAL;
444         if (get_user(opcode, sic->data))
445                 return -EFAULT;
446
447         bytes = max(in_len, out_len);
448         if (bytes) {
449                 buffer = kmalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
450                 if (!buffer)
451                         return -ENOMEM;
452
453                 memset(buffer, 0, bytes);
454         }
455
456         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
457
458         cmdlen = COMMAND_SIZE(opcode);
459
460         /*
461          * get command and data to send to device, if any
462          */
463         err = -EFAULT;
464         rq->cmd_len = cmdlen;
465         if (copy_from_user(rq->cmd, sic->data, cmdlen))
466                 goto error;
467
468         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
469                 goto error;
470
471         err = verify_command(rq->cmd, file->f_mode & FMODE_WRITE);
472         if (err)
473                 goto error;
474
475         /* default.  possible overriden later */
476         rq->retries = 5;
477
478         switch (opcode) {
479         case SEND_DIAGNOSTIC:
480         case FORMAT_UNIT:
481                 rq->timeout = FORMAT_UNIT_TIMEOUT;
482                 rq->retries = 1;
483                 break;
484         case START_STOP:
485                 rq->timeout = START_STOP_TIMEOUT;
486                 break;
487         case MOVE_MEDIUM:
488                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
489                 break;
490         case READ_ELEMENT_STATUS:
491                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
492                 break;
493         case READ_DEFECT_DATA:
494                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
495                 rq->retries = 1;
496                 break;
497         default:
498                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
499                 break;
500         }
501
502         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
503                 err = DRIVER_ERROR << 24;
504                 goto out;
505         }
506
507         memset(sense, 0, sizeof(sense));
508         rq->sense = sense;
509         rq->sense_len = 0;
510         rq->cmd_type = REQ_TYPE_BLOCK_PC;
511
512         blk_execute_rq(q, disk, rq, 0);
513
514 out:
515         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
516         if (err) {
517                 if (rq->sense_len && rq->sense) {
518                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
519                                 rq->sense_len : OMAX_SB_LEN;
520                         if (copy_to_user(sic->data, rq->sense, bytes))
521                                 err = -EFAULT;
522                 }
523         } else {
524                 if (copy_to_user(sic->data, buffer, out_len))
525                         err = -EFAULT;
526         }
527         
528 error:
529         kfree(buffer);
530         blk_put_request(rq);
531         return err;
532 }
533 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
534
535 /* Send basic block requests */
536 static int __blk_send_generic(request_queue_t *q, struct gendisk *bd_disk, int cmd, int data)
537 {
538         struct request *rq;
539         int err;
540
541         rq = blk_get_request(q, WRITE, __GFP_WAIT);
542         rq->cmd_type = REQ_TYPE_BLOCK_PC;
543         rq->data = NULL;
544         rq->data_len = 0;
545         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
546         memset(rq->cmd, 0, sizeof(rq->cmd));
547         rq->cmd[0] = cmd;
548         rq->cmd[4] = data;
549         rq->cmd_len = 6;
550         err = blk_execute_rq(q, bd_disk, rq, 0);
551         blk_put_request(rq);
552
553         return err;
554 }
555
556 static inline int blk_send_start_stop(request_queue_t *q, struct gendisk *bd_disk, int data)
557 {
558         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
559 }
560
561 int scsi_cmd_ioctl(struct file *file, struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
562 {
563         request_queue_t *q;
564         int err;
565
566         q = bd_disk->queue;
567         if (!q)
568                 return -ENXIO;
569
570         if (blk_get_queue(q))
571                 return -ENXIO;
572
573         switch (cmd) {
574                 /*
575                  * new sgv3 interface
576                  */
577                 case SG_GET_VERSION_NUM:
578                         err = sg_get_version(arg);
579                         break;
580                 case SCSI_IOCTL_GET_IDLUN:
581                         err = scsi_get_idlun(q, arg);
582                         break;
583                 case SCSI_IOCTL_GET_BUS_NUMBER:
584                         err = scsi_get_bus(q, arg);
585                         break;
586                 case SG_SET_TIMEOUT:
587                         err = sg_set_timeout(q, arg);
588                         break;
589                 case SG_GET_TIMEOUT:
590                         err = sg_get_timeout(q);
591                         break;
592                 case SG_GET_RESERVED_SIZE:
593                         err = sg_get_reserved_size(q, arg);
594                         break;
595                 case SG_SET_RESERVED_SIZE:
596                         err = sg_set_reserved_size(q, arg);
597                         break;
598                 case SG_EMULATED_HOST:
599                         err = sg_emulated_host(q, arg);
600                         break;
601                 case SG_IO: {
602                         struct sg_io_hdr hdr;
603
604                         err = -EFAULT;
605                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
606                                 break;
607                         err = sg_io(file, q, bd_disk, &hdr);
608                         if (err == -EFAULT)
609                                 break;
610
611                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
612                                 err = -EFAULT;
613                         break;
614                 }
615                 case CDROM_SEND_PACKET: {
616                         struct cdrom_generic_command cgc;
617                         struct sg_io_hdr hdr;
618
619                         err = -EFAULT;
620                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
621                                 break;
622                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
623                         memset(&hdr, 0, sizeof(hdr));
624                         hdr.interface_id = 'S';
625                         hdr.cmd_len = sizeof(cgc.cmd);
626                         hdr.dxfer_len = cgc.buflen;
627                         err = 0;
628                         switch (cgc.data_direction) {
629                                 case CGC_DATA_UNKNOWN:
630                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
631                                         break;
632                                 case CGC_DATA_WRITE:
633                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
634                                         break;
635                                 case CGC_DATA_READ:
636                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
637                                         break;
638                                 case CGC_DATA_NONE:
639                                         hdr.dxfer_direction = SG_DXFER_NONE;
640                                         break;
641                                 default:
642                                         err = -EINVAL;
643                         }
644                         if (err)
645                                 break;
646
647                         hdr.dxferp = cgc.buffer;
648                         hdr.sbp = cgc.sense;
649                         if (hdr.sbp)
650                                 hdr.mx_sb_len = sizeof(struct request_sense);
651                         hdr.timeout = cgc.timeout;
652                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
653                         hdr.cmd_len = sizeof(cgc.cmd);
654
655                         err = sg_io(file, q, bd_disk, &hdr);
656                         if (err == -EFAULT)
657                                 break;
658
659                         if (hdr.status)
660                                 err = -EIO;
661
662                         cgc.stat = err;
663                         cgc.buflen = hdr.resid;
664                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
665                                 err = -EFAULT;
666
667                         break;
668                 }
669
670                 /*
671                  * old junk scsi send command ioctl
672                  */
673                 case SCSI_IOCTL_SEND_COMMAND:
674                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
675                         err = -EINVAL;
676                         if (!arg)
677                                 break;
678
679                         err = sg_scsi_ioctl(file, q, bd_disk, arg);
680                         break;
681                 case CDROMCLOSETRAY:
682                         err = blk_send_start_stop(q, bd_disk, 0x03);
683                         break;
684                 case CDROMEJECT:
685                         err = blk_send_start_stop(q, bd_disk, 0x02);
686                         break;
687                 default:
688                         err = -ENOTTY;
689         }
690
691         blk_put_queue(q);
692         return err;
693 }
694
695 EXPORT_SYMBOL(scsi_cmd_ioctl);