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TOMOYO Linux Cross Reference
Linux/block/scsi_ioctl.c

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

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