block: call blk_scsi_ioctl_init()
[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 struct blk_cmd_filter {
36         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
37         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
38 } blk_default_cmd_filter;
39
40 /* Command group 3 is reserved and should never be used.  */
41 const unsigned char scsi_command_size_tbl[8] =
42 {
43         6, 10, 10, 12,
44         16, 12, 10, 10
45 };
46 EXPORT_SYMBOL(scsi_command_size_tbl);
47
48 #include <scsi/sg.h>
49
50 static int sg_get_version(int __user *p)
51 {
52         static const int sg_version_num = 30527;
53         return put_user(sg_version_num, p);
54 }
55
56 static int scsi_get_idlun(struct request_queue *q, int __user *p)
57 {
58         return put_user(0, p);
59 }
60
61 static int scsi_get_bus(struct request_queue *q, int __user *p)
62 {
63         return put_user(0, p);
64 }
65
66 static int sg_get_timeout(struct request_queue *q)
67 {
68         return jiffies_to_clock_t(q->sg_timeout);
69 }
70
71 static int sg_set_timeout(struct request_queue *q, int __user *p)
72 {
73         int timeout, err = get_user(timeout, p);
74
75         if (!err)
76                 q->sg_timeout = clock_t_to_jiffies(timeout);
77
78         return err;
79 }
80
81 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
82 {
83         unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
84
85         return put_user(val, p);
86 }
87
88 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
89 {
90         int size, err = get_user(size, p);
91
92         if (err)
93                 return err;
94
95         if (size < 0)
96                 return -EINVAL;
97         if (size > (queue_max_sectors(q) << 9))
98                 size = queue_max_sectors(q) << 9;
99
100         q->sg_reserved_size = size;
101         return 0;
102 }
103
104 /*
105  * will always return that we are ATAPI even for a real SCSI drive, I'm not
106  * so sure this is worth doing anything about (why would you care??)
107  */
108 static int sg_emulated_host(struct request_queue *q, int __user *p)
109 {
110         return put_user(1, p);
111 }
112
113 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
114 {
115         /* Basic read-only commands */
116         __set_bit(TEST_UNIT_READY, filter->read_ok);
117         __set_bit(REQUEST_SENSE, filter->read_ok);
118         __set_bit(READ_6, filter->read_ok);
119         __set_bit(READ_10, filter->read_ok);
120         __set_bit(READ_12, filter->read_ok);
121         __set_bit(READ_16, filter->read_ok);
122         __set_bit(READ_BUFFER, filter->read_ok);
123         __set_bit(READ_DEFECT_DATA, filter->read_ok);
124         __set_bit(READ_CAPACITY, filter->read_ok);
125         __set_bit(READ_LONG, filter->read_ok);
126         __set_bit(INQUIRY, filter->read_ok);
127         __set_bit(MODE_SENSE, filter->read_ok);
128         __set_bit(MODE_SENSE_10, filter->read_ok);
129         __set_bit(LOG_SENSE, filter->read_ok);
130         __set_bit(START_STOP, filter->read_ok);
131         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
132         __set_bit(VERIFY_16, filter->read_ok);
133         __set_bit(REPORT_LUNS, filter->read_ok);
134         __set_bit(SERVICE_ACTION_IN, filter->read_ok);
135         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
136         __set_bit(MAINTENANCE_IN, filter->read_ok);
137         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
138
139         /* Audio CD commands */
140         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
141         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
142         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
143         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
144         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
145
146         /* CD/DVD data reading */
147         __set_bit(GPCMD_READ_CD, filter->read_ok);
148         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
149         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
150         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
151         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
152         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
153         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
154         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
155         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
156         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
157         __set_bit(GPCMD_SCAN, filter->read_ok);
158         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
159         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
160         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
161         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
162         __set_bit(GPCMD_SEEK, filter->read_ok);
163         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
164
165         /* Basic writing commands */
166         __set_bit(WRITE_6, filter->write_ok);
167         __set_bit(WRITE_10, filter->write_ok);
168         __set_bit(WRITE_VERIFY, filter->write_ok);
169         __set_bit(WRITE_12, filter->write_ok);
170         __set_bit(WRITE_VERIFY_12, filter->write_ok);
171         __set_bit(WRITE_16, filter->write_ok);
172         __set_bit(WRITE_LONG, filter->write_ok);
173         __set_bit(WRITE_LONG_2, 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 has_write_perm)
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         /* if there's no filter set, assume we're filtering everything out */
205         if (!filter)
206                 return -EPERM;
207
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 */
213         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
214                 return 0;
215
216         return -EPERM;
217 }
218 EXPORT_SYMBOL(blk_verify_command);
219
220 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
221                              struct sg_io_hdr *hdr, fmode_t mode)
222 {
223         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
224                 return -EFAULT;
225         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
226                 return -EPERM;
227
228         /*
229          * fill in request structure
230          */
231         rq->cmd_len = hdr->cmd_len;
232         rq->cmd_type = REQ_TYPE_BLOCK_PC;
233
234         rq->timeout = msecs_to_jiffies(hdr->timeout);
235         if (!rq->timeout)
236                 rq->timeout = q->sg_timeout;
237         if (!rq->timeout)
238                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
239         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
240                 rq->timeout = BLK_MIN_SG_TIMEOUT;
241
242         return 0;
243 }
244
245 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
246                                  struct bio *bio)
247 {
248         int r, ret = 0;
249
250         /*
251          * fill in all the output members
252          */
253         hdr->status = rq->errors & 0xff;
254         hdr->masked_status = status_byte(rq->errors);
255         hdr->msg_status = msg_byte(rq->errors);
256         hdr->host_status = host_byte(rq->errors);
257         hdr->driver_status = driver_byte(rq->errors);
258         hdr->info = 0;
259         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
260                 hdr->info |= SG_INFO_CHECK;
261         hdr->resid = rq->resid_len;
262         hdr->sb_len_wr = 0;
263
264         if (rq->sense_len && hdr->sbp) {
265                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
266
267                 if (!copy_to_user(hdr->sbp, rq->sense, len))
268                         hdr->sb_len_wr = len;
269                 else
270                         ret = -EFAULT;
271         }
272
273         r = blk_rq_unmap_user(bio);
274         if (!ret)
275                 ret = r;
276         blk_put_request(rq);
277
278         return ret;
279 }
280
281 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
282                 struct sg_io_hdr *hdr, fmode_t mode)
283 {
284         unsigned long start_time;
285         int writing = 0, ret = 0;
286         struct request *rq;
287         char sense[SCSI_SENSE_BUFFERSIZE];
288         struct bio *bio;
289
290         if (hdr->interface_id != 'S')
291                 return -EINVAL;
292         if (hdr->cmd_len > BLK_MAX_CDB)
293                 return -EINVAL;
294
295         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
296                 return -EIO;
297
298         if (hdr->dxfer_len)
299                 switch (hdr->dxfer_direction) {
300                 default:
301                         return -EINVAL;
302                 case SG_DXFER_TO_DEV:
303                         writing = 1;
304                         break;
305                 case SG_DXFER_TO_FROM_DEV:
306                 case SG_DXFER_FROM_DEV:
307                         break;
308                 }
309
310         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
311         if (!rq)
312                 return -ENOMEM;
313
314         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
315                 blk_put_request(rq);
316                 return -EFAULT;
317         }
318
319         if (hdr->iovec_count) {
320                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
321                 size_t iov_data_len;
322                 struct sg_iovec *iov;
323
324                 iov = kmalloc(size, GFP_KERNEL);
325                 if (!iov) {
326                         ret = -ENOMEM;
327                         goto out;
328                 }
329
330                 if (copy_from_user(iov, hdr->dxferp, size)) {
331                         kfree(iov);
332                         ret = -EFAULT;
333                         goto out;
334                 }
335
336                 /* SG_IO howto says that the shorter of the two wins */
337                 iov_data_len = iov_length((struct iovec *)iov,
338                                           hdr->iovec_count);
339                 if (hdr->dxfer_len < iov_data_len) {
340                         hdr->iovec_count = iov_shorten((struct iovec *)iov,
341                                                        hdr->iovec_count,
342                                                        hdr->dxfer_len);
343                         iov_data_len = hdr->dxfer_len;
344                 }
345
346                 ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
347                                           iov_data_len, GFP_KERNEL);
348                 kfree(iov);
349         } else if (hdr->dxfer_len)
350                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
351                                       GFP_KERNEL);
352
353         if (ret)
354                 goto out;
355
356         bio = rq->bio;
357         memset(sense, 0, sizeof(sense));
358         rq->sense = sense;
359         rq->sense_len = 0;
360         rq->retries = 0;
361
362         start_time = jiffies;
363
364         /* ignore return value. All information is passed back to caller
365          * (if he doesn't check that is his problem).
366          * N.B. a non-zero SCSI status is _not_ necessarily an error.
367          */
368         blk_execute_rq(q, bd_disk, rq, 0);
369
370         hdr->duration = jiffies_to_msecs(jiffies - start_time);
371
372         return blk_complete_sghdr_rq(rq, hdr, bio);
373 out:
374         blk_put_request(rq);
375         return ret;
376 }
377
378 /**
379  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
380  * @file:       file this ioctl operates on (optional)
381  * @q:          request queue to send scsi commands down
382  * @disk:       gendisk to operate on (option)
383  * @sic:        userspace structure describing the command to perform
384  *
385  * Send down the scsi command described by @sic to the device below
386  * the request queue @q.  If @file is non-NULL it's used to perform
387  * fine-grained permission checks that allow users to send down
388  * non-destructive SCSI commands.  If the caller has a struct gendisk
389  * available it should be passed in as @disk to allow the low level
390  * driver to use the information contained in it.  A non-NULL @disk
391  * is only allowed if the caller knows that the low level driver doesn't
392  * need it (e.g. in the scsi subsystem).
393  *
394  * Notes:
395  *   -  This interface is deprecated - users should use the SG_IO
396  *      interface instead, as this is a more flexible approach to
397  *      performing SCSI commands on a device.
398  *   -  The SCSI command length is determined by examining the 1st byte
399  *      of the given command. There is no way to override this.
400  *   -  Data transfers are limited to PAGE_SIZE
401  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
402  *      accommodate the sense buffer when an error occurs.
403  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
404  *      old code will not be surprised.
405  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
406  *      a negative return and the Unix error code in 'errno'.
407  *      If the SCSI command succeeds then 0 is returned.
408  *      Positive numbers returned are the compacted SCSI error codes (4
409  *      bytes in one int) where the lowest byte is the SCSI status.
410  */
411 #define OMAX_SB_LEN 16          /* For backward compatibility */
412 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
413                 struct scsi_ioctl_command __user *sic)
414 {
415         struct request *rq;
416         int err;
417         unsigned int in_len, out_len, bytes, opcode, cmdlen;
418         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
419
420         if (!sic)
421                 return -EINVAL;
422
423         /*
424          * get in an out lengths, verify they don't exceed a page worth of data
425          */
426         if (get_user(in_len, &sic->inlen))
427                 return -EFAULT;
428         if (get_user(out_len, &sic->outlen))
429                 return -EFAULT;
430         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
431                 return -EINVAL;
432         if (get_user(opcode, sic->data))
433                 return -EFAULT;
434
435         bytes = max(in_len, out_len);
436         if (bytes) {
437                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
438                 if (!buffer)
439                         return -ENOMEM;
440
441         }
442
443         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
444
445         cmdlen = COMMAND_SIZE(opcode);
446
447         /*
448          * get command and data to send to device, if any
449          */
450         err = -EFAULT;
451         rq->cmd_len = cmdlen;
452         if (copy_from_user(rq->cmd, sic->data, cmdlen))
453                 goto error;
454
455         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
456                 goto error;
457
458         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
459         if (err)
460                 goto error;
461
462         /* default.  possible overriden later */
463         rq->retries = 5;
464
465         switch (opcode) {
466         case SEND_DIAGNOSTIC:
467         case FORMAT_UNIT:
468                 rq->timeout = FORMAT_UNIT_TIMEOUT;
469                 rq->retries = 1;
470                 break;
471         case START_STOP:
472                 rq->timeout = START_STOP_TIMEOUT;
473                 break;
474         case MOVE_MEDIUM:
475                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
476                 break;
477         case READ_ELEMENT_STATUS:
478                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
479                 break;
480         case READ_DEFECT_DATA:
481                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
482                 rq->retries = 1;
483                 break;
484         default:
485                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
486                 break;
487         }
488
489         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
490                 err = DRIVER_ERROR << 24;
491                 goto out;
492         }
493
494         memset(sense, 0, sizeof(sense));
495         rq->sense = sense;
496         rq->sense_len = 0;
497         rq->cmd_type = REQ_TYPE_BLOCK_PC;
498
499         blk_execute_rq(q, disk, rq, 0);
500
501 out:
502         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
503         if (err) {
504                 if (rq->sense_len && rq->sense) {
505                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
506                                 rq->sense_len : OMAX_SB_LEN;
507                         if (copy_to_user(sic->data, rq->sense, bytes))
508                                 err = -EFAULT;
509                 }
510         } else {
511                 if (copy_to_user(sic->data, buffer, out_len))
512                         err = -EFAULT;
513         }
514         
515 error:
516         kfree(buffer);
517         blk_put_request(rq);
518         return err;
519 }
520 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
521
522 /* Send basic block requests */
523 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
524                               int cmd, int data)
525 {
526         struct request *rq;
527         int err;
528
529         rq = blk_get_request(q, WRITE, __GFP_WAIT);
530         rq->cmd_type = REQ_TYPE_BLOCK_PC;
531         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
532         rq->cmd[0] = cmd;
533         rq->cmd[4] = data;
534         rq->cmd_len = 6;
535         err = blk_execute_rq(q, bd_disk, rq, 0);
536         blk_put_request(rq);
537
538         return err;
539 }
540
541 static inline int blk_send_start_stop(struct request_queue *q,
542                                       struct gendisk *bd_disk, int data)
543 {
544         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
545 }
546
547 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
548                    unsigned int cmd, void __user *arg)
549 {
550         int err;
551
552         if (!q || blk_get_queue(q))
553                 return -ENXIO;
554
555         switch (cmd) {
556                 /*
557                  * new sgv3 interface
558                  */
559                 case SG_GET_VERSION_NUM:
560                         err = sg_get_version(arg);
561                         break;
562                 case SCSI_IOCTL_GET_IDLUN:
563                         err = scsi_get_idlun(q, arg);
564                         break;
565                 case SCSI_IOCTL_GET_BUS_NUMBER:
566                         err = scsi_get_bus(q, arg);
567                         break;
568                 case SG_SET_TIMEOUT:
569                         err = sg_set_timeout(q, arg);
570                         break;
571                 case SG_GET_TIMEOUT:
572                         err = sg_get_timeout(q);
573                         break;
574                 case SG_GET_RESERVED_SIZE:
575                         err = sg_get_reserved_size(q, arg);
576                         break;
577                 case SG_SET_RESERVED_SIZE:
578                         err = sg_set_reserved_size(q, arg);
579                         break;
580                 case SG_EMULATED_HOST:
581                         err = sg_emulated_host(q, arg);
582                         break;
583                 case SG_IO: {
584                         struct sg_io_hdr hdr;
585
586                         err = -EFAULT;
587                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
588                                 break;
589                         err = sg_io(q, bd_disk, &hdr, mode);
590                         if (err == -EFAULT)
591                                 break;
592
593                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
594                                 err = -EFAULT;
595                         break;
596                 }
597                 case CDROM_SEND_PACKET: {
598                         struct cdrom_generic_command cgc;
599                         struct sg_io_hdr hdr;
600
601                         err = -EFAULT;
602                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
603                                 break;
604                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
605                         memset(&hdr, 0, sizeof(hdr));
606                         hdr.interface_id = 'S';
607                         hdr.cmd_len = sizeof(cgc.cmd);
608                         hdr.dxfer_len = cgc.buflen;
609                         err = 0;
610                         switch (cgc.data_direction) {
611                                 case CGC_DATA_UNKNOWN:
612                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
613                                         break;
614                                 case CGC_DATA_WRITE:
615                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
616                                         break;
617                                 case CGC_DATA_READ:
618                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
619                                         break;
620                                 case CGC_DATA_NONE:
621                                         hdr.dxfer_direction = SG_DXFER_NONE;
622                                         break;
623                                 default:
624                                         err = -EINVAL;
625                         }
626                         if (err)
627                                 break;
628
629                         hdr.dxferp = cgc.buffer;
630                         hdr.sbp = cgc.sense;
631                         if (hdr.sbp)
632                                 hdr.mx_sb_len = sizeof(struct request_sense);
633                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
634                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
635                         hdr.cmd_len = sizeof(cgc.cmd);
636
637                         err = sg_io(q, bd_disk, &hdr, mode);
638                         if (err == -EFAULT)
639                                 break;
640
641                         if (hdr.status)
642                                 err = -EIO;
643
644                         cgc.stat = err;
645                         cgc.buflen = hdr.resid;
646                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
647                                 err = -EFAULT;
648
649                         break;
650                 }
651
652                 /*
653                  * old junk scsi send command ioctl
654                  */
655                 case SCSI_IOCTL_SEND_COMMAND:
656                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
657                         err = -EINVAL;
658                         if (!arg)
659                                 break;
660
661                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
662                         break;
663                 case CDROMCLOSETRAY:
664                         err = blk_send_start_stop(q, bd_disk, 0x03);
665                         break;
666                 case CDROMEJECT:
667                         err = blk_send_start_stop(q, bd_disk, 0x02);
668                         break;
669                 default:
670                         err = -ENOTTY;
671         }
672
673         blk_put_queue(q);
674         return err;
675 }
676 EXPORT_SYMBOL(scsi_cmd_ioctl);
677
678 int __init blk_scsi_ioctl_init(void)
679 {
680         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
681         return 0;
682 }
683 fs_initcall(blk_scsi_ioctl_init);