smsc75xx: fix phy init reset loop
[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/ratelimit.h>
28 #include <linux/slab.h>
29 #include <linux/times.h>
30 #include <asm/uaccess.h>
31
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_ioctl.h>
34 #include <scsi/scsi_cmnd.h>
35
36 struct blk_cmd_filter {
37         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
38         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
39 };
40
41 static struct blk_cmd_filter blk_default_cmd_filter;
42
43 /* Command group 3 is reserved and should never be used.  */
44 const unsigned char scsi_command_size_tbl[8] =
45 {
46         6, 10, 10, 12,
47         16, 12, 10, 10
48 };
49 EXPORT_SYMBOL(scsi_command_size_tbl);
50
51 #include <scsi/sg.h>
52
53 static int sg_get_version(int __user *p)
54 {
55         static const int sg_version_num = 30527;
56         return put_user(sg_version_num, p);
57 }
58
59 static int scsi_get_idlun(struct request_queue *q, int __user *p)
60 {
61         return put_user(0, p);
62 }
63
64 static int scsi_get_bus(struct request_queue *q, int __user *p)
65 {
66         return put_user(0, p);
67 }
68
69 static int sg_get_timeout(struct request_queue *q)
70 {
71         return jiffies_to_clock_t(q->sg_timeout);
72 }
73
74 static int sg_set_timeout(struct request_queue *q, int __user *p)
75 {
76         int timeout, err = get_user(timeout, p);
77
78         if (!err)
79                 q->sg_timeout = clock_t_to_jiffies(timeout);
80
81         return err;
82 }
83
84 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
85 {
86         unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
87
88         return put_user(val, p);
89 }
90
91 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
92 {
93         int size, err = get_user(size, p);
94
95         if (err)
96                 return err;
97
98         if (size < 0)
99                 return -EINVAL;
100         if (size > (queue_max_sectors(q) << 9))
101                 size = queue_max_sectors(q) << 9;
102
103         q->sg_reserved_size = size;
104         return 0;
105 }
106
107 /*
108  * will always return that we are ATAPI even for a real SCSI drive, I'm not
109  * so sure this is worth doing anything about (why would you care??)
110  */
111 static int sg_emulated_host(struct request_queue *q, int __user *p)
112 {
113         return put_user(1, p);
114 }
115
116 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
117 {
118         /* Basic read-only commands */
119         __set_bit(TEST_UNIT_READY, filter->read_ok);
120         __set_bit(REQUEST_SENSE, filter->read_ok);
121         __set_bit(READ_6, filter->read_ok);
122         __set_bit(READ_10, filter->read_ok);
123         __set_bit(READ_12, filter->read_ok);
124         __set_bit(READ_16, filter->read_ok);
125         __set_bit(READ_BUFFER, filter->read_ok);
126         __set_bit(READ_DEFECT_DATA, filter->read_ok);
127         __set_bit(READ_CAPACITY, filter->read_ok);
128         __set_bit(READ_LONG, filter->read_ok);
129         __set_bit(INQUIRY, filter->read_ok);
130         __set_bit(MODE_SENSE, filter->read_ok);
131         __set_bit(MODE_SENSE_10, filter->read_ok);
132         __set_bit(LOG_SENSE, filter->read_ok);
133         __set_bit(START_STOP, filter->read_ok);
134         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
135         __set_bit(VERIFY_16, filter->read_ok);
136         __set_bit(REPORT_LUNS, filter->read_ok);
137         __set_bit(SERVICE_ACTION_IN, filter->read_ok);
138         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
139         __set_bit(MAINTENANCE_IN, filter->read_ok);
140         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
141
142         /* Audio CD commands */
143         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
144         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
145         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
146         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
147         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
148
149         /* CD/DVD data reading */
150         __set_bit(GPCMD_READ_CD, filter->read_ok);
151         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
152         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
153         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
154         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
155         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
156         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
157         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
158         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
159         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
160         __set_bit(GPCMD_SCAN, filter->read_ok);
161         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
162         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
163         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
164         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
165         __set_bit(GPCMD_SEEK, filter->read_ok);
166         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
167
168         /* Basic writing commands */
169         __set_bit(WRITE_6, filter->write_ok);
170         __set_bit(WRITE_10, filter->write_ok);
171         __set_bit(WRITE_VERIFY, filter->write_ok);
172         __set_bit(WRITE_12, filter->write_ok);
173         __set_bit(WRITE_VERIFY_12, filter->write_ok);
174         __set_bit(WRITE_16, filter->write_ok);
175         __set_bit(WRITE_LONG, filter->write_ok);
176         __set_bit(WRITE_LONG_2, filter->write_ok);
177         __set_bit(ERASE, filter->write_ok);
178         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
179         __set_bit(MODE_SELECT, filter->write_ok);
180         __set_bit(LOG_SELECT, filter->write_ok);
181         __set_bit(GPCMD_BLANK, filter->write_ok);
182         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
183         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
184         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
185         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
186         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
187         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
188         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
189         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
190         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
191         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
192         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
193         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
194         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
195         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
196         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
197 }
198
199 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
200 {
201         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
202
203         /* root can do any command. */
204         if (capable(CAP_SYS_RAWIO))
205                 return 0;
206
207         /* if there's no filter set, assume we're filtering everything out */
208         if (!filter)
209                 return -EPERM;
210
211         /* Anybody who can open the device can do a read-safe command */
212         if (test_bit(cmd[0], filter->read_ok))
213                 return 0;
214
215         /* Write-safe commands require a writable open */
216         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
217                 return 0;
218
219         return -EPERM;
220 }
221 EXPORT_SYMBOL(blk_verify_command);
222
223 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
224                              struct sg_io_hdr *hdr, fmode_t mode)
225 {
226         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
227                 return -EFAULT;
228         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
229                 return -EPERM;
230
231         /*
232          * fill in request structure
233          */
234         rq->cmd_len = hdr->cmd_len;
235         rq->cmd_type = REQ_TYPE_BLOCK_PC;
236
237         rq->timeout = msecs_to_jiffies(hdr->timeout);
238         if (!rq->timeout)
239                 rq->timeout = q->sg_timeout;
240         if (!rq->timeout)
241                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
242         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
243                 rq->timeout = BLK_MIN_SG_TIMEOUT;
244
245         return 0;
246 }
247
248 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
249                                  struct bio *bio)
250 {
251         int r, ret = 0;
252
253         /*
254          * fill in all the output members
255          */
256         hdr->status = rq->errors & 0xff;
257         hdr->masked_status = status_byte(rq->errors);
258         hdr->msg_status = msg_byte(rq->errors);
259         hdr->host_status = host_byte(rq->errors);
260         hdr->driver_status = driver_byte(rq->errors);
261         hdr->info = 0;
262         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
263                 hdr->info |= SG_INFO_CHECK;
264         hdr->resid = rq->resid_len;
265         hdr->sb_len_wr = 0;
266
267         if (rq->sense_len && hdr->sbp) {
268                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
269
270                 if (!copy_to_user(hdr->sbp, rq->sense, len))
271                         hdr->sb_len_wr = len;
272                 else
273                         ret = -EFAULT;
274         }
275
276         r = blk_rq_unmap_user(bio);
277         if (!ret)
278                 ret = r;
279         blk_put_request(rq);
280
281         return ret;
282 }
283
284 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
285                 struct sg_io_hdr *hdr, fmode_t mode)
286 {
287         unsigned long start_time;
288         int writing = 0, ret = 0;
289         struct request *rq;
290         char sense[SCSI_SENSE_BUFFERSIZE];
291         struct bio *bio;
292
293         if (hdr->interface_id != 'S')
294                 return -EINVAL;
295         if (hdr->cmd_len > BLK_MAX_CDB)
296                 return -EINVAL;
297
298         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
299                 return -EIO;
300
301         if (hdr->dxfer_len)
302                 switch (hdr->dxfer_direction) {
303                 default:
304                         return -EINVAL;
305                 case SG_DXFER_TO_DEV:
306                         writing = 1;
307                         break;
308                 case SG_DXFER_TO_FROM_DEV:
309                 case SG_DXFER_FROM_DEV:
310                         break;
311                 }
312
313         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
314         if (!rq)
315                 return -ENOMEM;
316
317         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
318                 blk_put_request(rq);
319                 return -EFAULT;
320         }
321
322         if (hdr->iovec_count) {
323                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
324                 size_t iov_data_len;
325                 struct sg_iovec *sg_iov;
326                 struct iovec *iov;
327                 int i;
328
329                 sg_iov = kmalloc(size, GFP_KERNEL);
330                 if (!sg_iov) {
331                         ret = -ENOMEM;
332                         goto out;
333                 }
334
335                 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
336                         kfree(sg_iov);
337                         ret = -EFAULT;
338                         goto out;
339                 }
340
341                 /*
342                  * Sum up the vecs, making sure they don't overflow
343                  */
344                 iov = (struct iovec *) sg_iov;
345                 iov_data_len = 0;
346                 for (i = 0; i < hdr->iovec_count; i++) {
347                         if (iov_data_len + iov[i].iov_len < iov_data_len) {
348                                 kfree(sg_iov);
349                                 ret = -EINVAL;
350                                 goto out;
351                         }
352                         iov_data_len += iov[i].iov_len;
353                 }
354
355                 /* SG_IO howto says that the shorter of the two wins */
356                 if (hdr->dxfer_len < iov_data_len) {
357                         hdr->iovec_count = iov_shorten(iov,
358                                                        hdr->iovec_count,
359                                                        hdr->dxfer_len);
360                         iov_data_len = hdr->dxfer_len;
361                 }
362
363                 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
364                                           iov_data_len, GFP_KERNEL);
365                 kfree(sg_iov);
366         } else if (hdr->dxfer_len)
367                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
368                                       GFP_KERNEL);
369
370         if (ret)
371                 goto out;
372
373         bio = rq->bio;
374         memset(sense, 0, sizeof(sense));
375         rq->sense = sense;
376         rq->sense_len = 0;
377         rq->retries = 0;
378
379         start_time = jiffies;
380
381         /* ignore return value. All information is passed back to caller
382          * (if he doesn't check that is his problem).
383          * N.B. a non-zero SCSI status is _not_ necessarily an error.
384          */
385         blk_execute_rq(q, bd_disk, rq, 0);
386
387         hdr->duration = jiffies_to_msecs(jiffies - start_time);
388
389         return blk_complete_sghdr_rq(rq, hdr, bio);
390 out:
391         blk_put_request(rq);
392         return ret;
393 }
394
395 /**
396  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
397  * @file:       file this ioctl operates on (optional)
398  * @q:          request queue to send scsi commands down
399  * @disk:       gendisk to operate on (option)
400  * @sic:        userspace structure describing the command to perform
401  *
402  * Send down the scsi command described by @sic to the device below
403  * the request queue @q.  If @file is non-NULL it's used to perform
404  * fine-grained permission checks that allow users to send down
405  * non-destructive SCSI commands.  If the caller has a struct gendisk
406  * available it should be passed in as @disk to allow the low level
407  * driver to use the information contained in it.  A non-NULL @disk
408  * is only allowed if the caller knows that the low level driver doesn't
409  * need it (e.g. in the scsi subsystem).
410  *
411  * Notes:
412  *   -  This interface is deprecated - users should use the SG_IO
413  *      interface instead, as this is a more flexible approach to
414  *      performing SCSI commands on a device.
415  *   -  The SCSI command length is determined by examining the 1st byte
416  *      of the given command. There is no way to override this.
417  *   -  Data transfers are limited to PAGE_SIZE
418  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
419  *      accommodate the sense buffer when an error occurs.
420  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
421  *      old code will not be surprised.
422  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
423  *      a negative return and the Unix error code in 'errno'.
424  *      If the SCSI command succeeds then 0 is returned.
425  *      Positive numbers returned are the compacted SCSI error codes (4
426  *      bytes in one int) where the lowest byte is the SCSI status.
427  */
428 #define OMAX_SB_LEN 16          /* For backward compatibility */
429 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
430                 struct scsi_ioctl_command __user *sic)
431 {
432         struct request *rq;
433         int err;
434         unsigned int in_len, out_len, bytes, opcode, cmdlen;
435         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
436
437         if (!sic)
438                 return -EINVAL;
439
440         /*
441          * get in an out lengths, verify they don't exceed a page worth of data
442          */
443         if (get_user(in_len, &sic->inlen))
444                 return -EFAULT;
445         if (get_user(out_len, &sic->outlen))
446                 return -EFAULT;
447         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
448                 return -EINVAL;
449         if (get_user(opcode, sic->data))
450                 return -EFAULT;
451
452         bytes = max(in_len, out_len);
453         if (bytes) {
454                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
455                 if (!buffer)
456                         return -ENOMEM;
457
458         }
459
460         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
461
462         cmdlen = COMMAND_SIZE(opcode);
463
464         /*
465          * get command and data to send to device, if any
466          */
467         err = -EFAULT;
468         rq->cmd_len = cmdlen;
469         if (copy_from_user(rq->cmd, sic->data, cmdlen))
470                 goto error;
471
472         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
473                 goto error;
474
475         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
476         if (err)
477                 goto error;
478
479         /* default.  possible overriden later */
480         rq->retries = 5;
481
482         switch (opcode) {
483         case SEND_DIAGNOSTIC:
484         case FORMAT_UNIT:
485                 rq->timeout = FORMAT_UNIT_TIMEOUT;
486                 rq->retries = 1;
487                 break;
488         case START_STOP:
489                 rq->timeout = START_STOP_TIMEOUT;
490                 break;
491         case MOVE_MEDIUM:
492                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
493                 break;
494         case READ_ELEMENT_STATUS:
495                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
496                 break;
497         case READ_DEFECT_DATA:
498                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
499                 rq->retries = 1;
500                 break;
501         default:
502                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
503                 break;
504         }
505
506         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
507                 err = DRIVER_ERROR << 24;
508                 goto out;
509         }
510
511         memset(sense, 0, sizeof(sense));
512         rq->sense = sense;
513         rq->sense_len = 0;
514         rq->cmd_type = REQ_TYPE_BLOCK_PC;
515
516         blk_execute_rq(q, disk, rq, 0);
517
518 out:
519         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
520         if (err) {
521                 if (rq->sense_len && rq->sense) {
522                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
523                                 rq->sense_len : OMAX_SB_LEN;
524                         if (copy_to_user(sic->data, rq->sense, bytes))
525                                 err = -EFAULT;
526                 }
527         } else {
528                 if (copy_to_user(sic->data, buffer, out_len))
529                         err = -EFAULT;
530         }
531         
532 error:
533         kfree(buffer);
534         blk_put_request(rq);
535         return err;
536 }
537 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
538
539 /* Send basic block requests */
540 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
541                               int cmd, int data)
542 {
543         struct request *rq;
544         int err;
545
546         rq = blk_get_request(q, WRITE, __GFP_WAIT);
547         rq->cmd_type = REQ_TYPE_BLOCK_PC;
548         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
549         rq->cmd[0] = cmd;
550         rq->cmd[4] = data;
551         rq->cmd_len = 6;
552         err = blk_execute_rq(q, bd_disk, rq, 0);
553         blk_put_request(rq);
554
555         return err;
556 }
557
558 static inline int blk_send_start_stop(struct request_queue *q,
559                                       struct gendisk *bd_disk, int data)
560 {
561         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
562 }
563
564 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
565                    unsigned int cmd, void __user *arg)
566 {
567         int err;
568
569         if (!q)
570                 return -ENXIO;
571
572         switch (cmd) {
573                 /*
574                  * new sgv3 interface
575                  */
576                 case SG_GET_VERSION_NUM:
577                         err = sg_get_version(arg);
578                         break;
579                 case SCSI_IOCTL_GET_IDLUN:
580                         err = scsi_get_idlun(q, arg);
581                         break;
582                 case SCSI_IOCTL_GET_BUS_NUMBER:
583                         err = scsi_get_bus(q, arg);
584                         break;
585                 case SG_SET_TIMEOUT:
586                         err = sg_set_timeout(q, arg);
587                         break;
588                 case SG_GET_TIMEOUT:
589                         err = sg_get_timeout(q);
590                         break;
591                 case SG_GET_RESERVED_SIZE:
592                         err = sg_get_reserved_size(q, arg);
593                         break;
594                 case SG_SET_RESERVED_SIZE:
595                         err = sg_set_reserved_size(q, arg);
596                         break;
597                 case SG_EMULATED_HOST:
598                         err = sg_emulated_host(q, arg);
599                         break;
600                 case SG_IO: {
601                         struct sg_io_hdr hdr;
602
603                         err = -EFAULT;
604                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
605                                 break;
606                         err = sg_io(q, bd_disk, &hdr, mode);
607                         if (err == -EFAULT)
608                                 break;
609
610                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
611                                 err = -EFAULT;
612                         break;
613                 }
614                 case CDROM_SEND_PACKET: {
615                         struct cdrom_generic_command cgc;
616                         struct sg_io_hdr hdr;
617
618                         err = -EFAULT;
619                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
620                                 break;
621                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
622                         memset(&hdr, 0, sizeof(hdr));
623                         hdr.interface_id = 'S';
624                         hdr.cmd_len = sizeof(cgc.cmd);
625                         hdr.dxfer_len = cgc.buflen;
626                         err = 0;
627                         switch (cgc.data_direction) {
628                                 case CGC_DATA_UNKNOWN:
629                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
630                                         break;
631                                 case CGC_DATA_WRITE:
632                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
633                                         break;
634                                 case CGC_DATA_READ:
635                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
636                                         break;
637                                 case CGC_DATA_NONE:
638                                         hdr.dxfer_direction = SG_DXFER_NONE;
639                                         break;
640                                 default:
641                                         err = -EINVAL;
642                         }
643                         if (err)
644                                 break;
645
646                         hdr.dxferp = cgc.buffer;
647                         hdr.sbp = cgc.sense;
648                         if (hdr.sbp)
649                                 hdr.mx_sb_len = sizeof(struct request_sense);
650                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
651                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
652                         hdr.cmd_len = sizeof(cgc.cmd);
653
654                         err = sg_io(q, bd_disk, &hdr, mode);
655                         if (err == -EFAULT)
656                                 break;
657
658                         if (hdr.status)
659                                 err = -EIO;
660
661                         cgc.stat = err;
662                         cgc.buflen = hdr.resid;
663                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
664                                 err = -EFAULT;
665
666                         break;
667                 }
668
669                 /*
670                  * old junk scsi send command ioctl
671                  */
672                 case SCSI_IOCTL_SEND_COMMAND:
673                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
674                         err = -EINVAL;
675                         if (!arg)
676                                 break;
677
678                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
679                         break;
680                 case CDROMCLOSETRAY:
681                         err = blk_send_start_stop(q, bd_disk, 0x03);
682                         break;
683                 case CDROMEJECT:
684                         err = blk_send_start_stop(q, bd_disk, 0x02);
685                         break;
686                 default:
687                         err = -ENOTTY;
688         }
689
690         return err;
691 }
692 EXPORT_SYMBOL(scsi_cmd_ioctl);
693
694 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
695 {
696         if (bd && bd == bd->bd_contains)
697                 return 0;
698
699         /* Actually none of these is particularly useful on a partition,
700          * but they are safe.
701          */
702         switch (cmd) {
703         case SCSI_IOCTL_GET_IDLUN:
704         case SCSI_IOCTL_GET_BUS_NUMBER:
705         case SCSI_IOCTL_GET_PCI:
706         case SCSI_IOCTL_PROBE_HOST:
707         case SG_GET_VERSION_NUM:
708         case SG_SET_TIMEOUT:
709         case SG_GET_TIMEOUT:
710         case SG_GET_RESERVED_SIZE:
711         case SG_SET_RESERVED_SIZE:
712         case SG_EMULATED_HOST:
713                 return 0;
714         case CDROM_GET_CAPABILITY:
715                 /* Keep this until we remove the printk below.  udev sends it
716                  * and we do not want to spam dmesg about it.   CD-ROMs do
717                  * not have partitions, so we get here only for disks.
718                  */
719                 return -ENOIOCTLCMD;
720         default:
721                 break;
722         }
723
724         /* In particular, rule out all resets and host-specific ioctls.  */
725         printk_ratelimited(KERN_WARNING
726                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
727
728         return capable(CAP_SYS_RAWIO) ? 0 : -ENOIOCTLCMD;
729 }
730 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
731
732 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
733                        unsigned int cmd, void __user *arg)
734 {
735         int ret;
736
737         ret = scsi_verify_blk_ioctl(bd, cmd);
738         if (ret < 0)
739                 return ret;
740
741         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
742 }
743 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
744
745 static int __init blk_scsi_ioctl_init(void)
746 {
747         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
748         return 0;
749 }
750 fs_initcall(blk_scsi_ioctl_init);