Merge tag 'timers-urgent-2021-02-22' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / block / scsi_ioctl.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
4  */
5 #include <linux/compat.h>
6 #include <linux/kernel.h>
7 #include <linux/errno.h>
8 #include <linux/string.h>
9 #include <linux/module.h>
10 #include <linux/blkdev.h>
11 #include <linux/capability.h>
12 #include <linux/completion.h>
13 #include <linux/cdrom.h>
14 #include <linux/ratelimit.h>
15 #include <linux/slab.h>
16 #include <linux/times.h>
17 #include <linux/uio.h>
18 #include <linux/uaccess.h>
19
20 #include <scsi/scsi.h>
21 #include <scsi/scsi_ioctl.h>
22 #include <scsi/scsi_cmnd.h>
23 #include <scsi/sg.h>
24
25 struct blk_cmd_filter {
26         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
27         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
28 };
29
30 static struct blk_cmd_filter blk_default_cmd_filter;
31
32 /* Command group 3 is reserved and should never be used.  */
33 const unsigned char scsi_command_size_tbl[8] =
34 {
35         6, 10, 10, 12,
36         16, 12, 10, 10
37 };
38 EXPORT_SYMBOL(scsi_command_size_tbl);
39
40 static int sg_get_version(int __user *p)
41 {
42         static const int sg_version_num = 30527;
43         return put_user(sg_version_num, p);
44 }
45
46 static int scsi_get_idlun(struct request_queue *q, int __user *p)
47 {
48         return put_user(0, p);
49 }
50
51 static int scsi_get_bus(struct request_queue *q, int __user *p)
52 {
53         return put_user(0, p);
54 }
55
56 static int sg_get_timeout(struct request_queue *q)
57 {
58         return jiffies_to_clock_t(q->sg_timeout);
59 }
60
61 static int sg_set_timeout(struct request_queue *q, int __user *p)
62 {
63         int timeout, err = get_user(timeout, p);
64
65         if (!err)
66                 q->sg_timeout = clock_t_to_jiffies(timeout);
67
68         return err;
69 }
70
71 static int max_sectors_bytes(struct request_queue *q)
72 {
73         unsigned int max_sectors = queue_max_sectors(q);
74
75         max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
76
77         return max_sectors << 9;
78 }
79
80 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
81 {
82         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
83
84         return put_user(val, p);
85 }
86
87 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
88 {
89         int size, err = get_user(size, p);
90
91         if (err)
92                 return err;
93
94         if (size < 0)
95                 return -EINVAL;
96
97         q->sg_reserved_size = min(size, max_sectors_bytes(q));
98         return 0;
99 }
100
101 /*
102  * will always return that we are ATAPI even for a real SCSI drive, I'm not
103  * so sure this is worth doing anything about (why would you care??)
104  */
105 static int sg_emulated_host(struct request_queue *q, int __user *p)
106 {
107         return put_user(1, p);
108 }
109
110 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
111 {
112         /* Basic read-only commands */
113         __set_bit(TEST_UNIT_READY, filter->read_ok);
114         __set_bit(REQUEST_SENSE, filter->read_ok);
115         __set_bit(READ_6, filter->read_ok);
116         __set_bit(READ_10, filter->read_ok);
117         __set_bit(READ_12, filter->read_ok);
118         __set_bit(READ_16, filter->read_ok);
119         __set_bit(READ_BUFFER, filter->read_ok);
120         __set_bit(READ_DEFECT_DATA, filter->read_ok);
121         __set_bit(READ_CAPACITY, filter->read_ok);
122         __set_bit(READ_LONG, filter->read_ok);
123         __set_bit(INQUIRY, filter->read_ok);
124         __set_bit(MODE_SENSE, filter->read_ok);
125         __set_bit(MODE_SENSE_10, filter->read_ok);
126         __set_bit(LOG_SENSE, filter->read_ok);
127         __set_bit(START_STOP, filter->read_ok);
128         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
129         __set_bit(VERIFY_16, filter->read_ok);
130         __set_bit(REPORT_LUNS, filter->read_ok);
131         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
132         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
133         __set_bit(MAINTENANCE_IN, filter->read_ok);
134         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
135
136         /* Audio CD commands */
137         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
138         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
139         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
140         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
141         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
142
143         /* CD/DVD data reading */
144         __set_bit(GPCMD_READ_CD, filter->read_ok);
145         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
146         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
147         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
148         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
149         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
150         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
151         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
152         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
153         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
154         __set_bit(GPCMD_SCAN, filter->read_ok);
155         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
156         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
157         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
158         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
159         __set_bit(GPCMD_SEEK, filter->read_ok);
160         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
161
162         /* Basic writing commands */
163         __set_bit(WRITE_6, filter->write_ok);
164         __set_bit(WRITE_10, filter->write_ok);
165         __set_bit(WRITE_VERIFY, filter->write_ok);
166         __set_bit(WRITE_12, filter->write_ok);
167         __set_bit(WRITE_VERIFY_12, filter->write_ok);
168         __set_bit(WRITE_16, filter->write_ok);
169         __set_bit(WRITE_LONG, filter->write_ok);
170         __set_bit(WRITE_LONG_2, filter->write_ok);
171         __set_bit(WRITE_SAME, filter->write_ok);
172         __set_bit(WRITE_SAME_16, filter->write_ok);
173         __set_bit(WRITE_SAME_32, 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         /* ZBC Commands */
196         __set_bit(ZBC_OUT, filter->write_ok);
197         __set_bit(ZBC_IN, filter->read_ok);
198 }
199
200 int blk_verify_command(unsigned char *cmd, fmode_t mode)
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         /* 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) && (mode & FMODE_WRITE))
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         struct scsi_request *req = scsi_req(rq);
224
225         if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
226                 return -EFAULT;
227         if (blk_verify_command(req->cmd, mode))
228                 return -EPERM;
229
230         /*
231          * fill in request structure
232          */
233         req->cmd_len = hdr->cmd_len;
234
235         rq->timeout = msecs_to_jiffies(hdr->timeout);
236         if (!rq->timeout)
237                 rq->timeout = q->sg_timeout;
238         if (!rq->timeout)
239                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
240         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
241                 rq->timeout = BLK_MIN_SG_TIMEOUT;
242
243         return 0;
244 }
245
246 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
247                                  struct bio *bio)
248 {
249         struct scsi_request *req = scsi_req(rq);
250         int r, ret = 0;
251
252         /*
253          * fill in all the output members
254          */
255         hdr->status = req->result & 0xff;
256         hdr->masked_status = status_byte(req->result);
257         hdr->msg_status = msg_byte(req->result);
258         hdr->host_status = host_byte(req->result);
259         hdr->driver_status = driver_byte(req->result);
260         hdr->info = 0;
261         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
262                 hdr->info |= SG_INFO_CHECK;
263         hdr->resid = req->resid_len;
264         hdr->sb_len_wr = 0;
265
266         if (req->sense_len && hdr->sbp) {
267                 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
268
269                 if (!copy_to_user(hdr->sbp, req->sense, len))
270                         hdr->sb_len_wr = len;
271                 else
272                         ret = -EFAULT;
273         }
274
275         r = blk_rq_unmap_user(bio);
276         if (!ret)
277                 ret = r;
278
279         return ret;
280 }
281
282 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
283                 struct sg_io_hdr *hdr, fmode_t mode)
284 {
285         unsigned long start_time;
286         ssize_t ret = 0;
287         int writing = 0;
288         int at_head = 0;
289         struct request *rq;
290         struct scsi_request *req;
291         struct bio *bio;
292
293         if (hdr->interface_id != 'S')
294                 return -EINVAL;
295
296         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
297                 return -EIO;
298
299         if (hdr->dxfer_len)
300                 switch (hdr->dxfer_direction) {
301                 default:
302                         return -EINVAL;
303                 case SG_DXFER_TO_DEV:
304                         writing = 1;
305                         break;
306                 case SG_DXFER_TO_FROM_DEV:
307                 case SG_DXFER_FROM_DEV:
308                         break;
309                 }
310         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
311                 at_head = 1;
312
313         ret = -ENOMEM;
314         rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
315         if (IS_ERR(rq))
316                 return PTR_ERR(rq);
317         req = scsi_req(rq);
318
319         if (hdr->cmd_len > BLK_MAX_CDB) {
320                 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
321                 if (!req->cmd)
322                         goto out_put_request;
323         }
324
325         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
326         if (ret < 0)
327                 goto out_free_cdb;
328
329         ret = 0;
330         if (hdr->iovec_count) {
331                 struct iov_iter i;
332                 struct iovec *iov = NULL;
333
334                 ret = import_iovec(rq_data_dir(rq), hdr->dxferp,
335                                    hdr->iovec_count, 0, &iov, &i);
336                 if (ret < 0)
337                         goto out_free_cdb;
338
339                 /* SG_IO howto says that the shorter of the two wins */
340                 iov_iter_truncate(&i, hdr->dxfer_len);
341
342                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
343                 kfree(iov);
344         } else if (hdr->dxfer_len)
345                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
346                                       GFP_KERNEL);
347
348         if (ret)
349                 goto out_free_cdb;
350
351         bio = rq->bio;
352         req->retries = 0;
353
354         start_time = jiffies;
355
356         /* ignore return value. All information is passed back to caller
357          * (if he doesn't check that is his problem).
358          * N.B. a non-zero SCSI status is _not_ necessarily an error.
359          */
360         blk_execute_rq(bd_disk, rq, at_head);
361
362         hdr->duration = jiffies_to_msecs(jiffies - start_time);
363
364         ret = blk_complete_sghdr_rq(rq, hdr, bio);
365
366 out_free_cdb:
367         scsi_req_free_cmd(req);
368 out_put_request:
369         blk_put_request(rq);
370         return ret;
371 }
372
373 /**
374  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
375  * @q:          request queue to send scsi commands down
376  * @disk:       gendisk to operate on (option)
377  * @mode:       mode used to open the file through which the ioctl has been
378  *              submitted
379  * @sic:        userspace structure describing the command to perform
380  *
381  * Send down the scsi command described by @sic to the device below
382  * the request queue @q.  If @file is non-NULL it's used to perform
383  * fine-grained permission checks that allow users to send down
384  * non-destructive SCSI commands.  If the caller has a struct gendisk
385  * available it should be passed in as @disk to allow the low level
386  * driver to use the information contained in it.  A non-NULL @disk
387  * is only allowed if the caller knows that the low level driver doesn't
388  * need it (e.g. in the scsi subsystem).
389  *
390  * Notes:
391  *   -  This interface is deprecated - users should use the SG_IO
392  *      interface instead, as this is a more flexible approach to
393  *      performing SCSI commands on a device.
394  *   -  The SCSI command length is determined by examining the 1st byte
395  *      of the given command. There is no way to override this.
396  *   -  Data transfers are limited to PAGE_SIZE
397  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
398  *      accommodate the sense buffer when an error occurs.
399  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
400  *      old code will not be surprised.
401  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
402  *      a negative return and the Unix error code in 'errno'.
403  *      If the SCSI command succeeds then 0 is returned.
404  *      Positive numbers returned are the compacted SCSI error codes (4
405  *      bytes in one int) where the lowest byte is the SCSI status.
406  */
407 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
408                 struct scsi_ioctl_command __user *sic)
409 {
410         enum { OMAX_SB_LEN = 16 };      /* For backward compatibility */
411         struct request *rq;
412         struct scsi_request *req;
413         int err;
414         unsigned int in_len, out_len, bytes, opcode, cmdlen;
415         char *buffer = NULL;
416
417         if (!sic)
418                 return -EINVAL;
419
420         /*
421          * get in an out lengths, verify they don't exceed a page worth of data
422          */
423         if (get_user(in_len, &sic->inlen))
424                 return -EFAULT;
425         if (get_user(out_len, &sic->outlen))
426                 return -EFAULT;
427         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
428                 return -EINVAL;
429         if (get_user(opcode, sic->data))
430                 return -EFAULT;
431
432         bytes = max(in_len, out_len);
433         if (bytes) {
434                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
435                 if (!buffer)
436                         return -ENOMEM;
437
438         }
439
440         rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
441         if (IS_ERR(rq)) {
442                 err = PTR_ERR(rq);
443                 goto error_free_buffer;
444         }
445         req = scsi_req(rq);
446
447         cmdlen = COMMAND_SIZE(opcode);
448
449         /*
450          * get command and data to send to device, if any
451          */
452         err = -EFAULT;
453         req->cmd_len = cmdlen;
454         if (copy_from_user(req->cmd, sic->data, cmdlen))
455                 goto error;
456
457         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
458                 goto error;
459
460         err = blk_verify_command(req->cmd, mode);
461         if (err)
462                 goto error;
463
464         /* default.  possible overriden later */
465         req->retries = 5;
466
467         switch (opcode) {
468         case SEND_DIAGNOSTIC:
469         case FORMAT_UNIT:
470                 rq->timeout = FORMAT_UNIT_TIMEOUT;
471                 req->retries = 1;
472                 break;
473         case START_STOP:
474                 rq->timeout = START_STOP_TIMEOUT;
475                 break;
476         case MOVE_MEDIUM:
477                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
478                 break;
479         case READ_ELEMENT_STATUS:
480                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
481                 break;
482         case READ_DEFECT_DATA:
483                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
484                 req->retries = 1;
485                 break;
486         default:
487                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
488                 break;
489         }
490
491         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
492                 err = DRIVER_ERROR << 24;
493                 goto error;
494         }
495
496         blk_execute_rq(disk, rq, 0);
497
498         err = req->result & 0xff;       /* only 8 bit SCSI status */
499         if (err) {
500                 if (req->sense_len && req->sense) {
501                         bytes = (OMAX_SB_LEN > req->sense_len) ?
502                                 req->sense_len : OMAX_SB_LEN;
503                         if (copy_to_user(sic->data, req->sense, bytes))
504                                 err = -EFAULT;
505                 }
506         } else {
507                 if (copy_to_user(sic->data, buffer, out_len))
508                         err = -EFAULT;
509         }
510         
511 error:
512         blk_put_request(rq);
513
514 error_free_buffer:
515         kfree(buffer);
516
517         return err;
518 }
519 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
520
521 /* Send basic block requests */
522 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
523                               int cmd, int data)
524 {
525         struct request *rq;
526         int err;
527
528         rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
529         if (IS_ERR(rq))
530                 return PTR_ERR(rq);
531         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
532         scsi_req(rq)->cmd[0] = cmd;
533         scsi_req(rq)->cmd[4] = data;
534         scsi_req(rq)->cmd_len = 6;
535         blk_execute_rq(bd_disk, rq, 0);
536         err = scsi_req(rq)->result ? -EIO : 0;
537         blk_put_request(rq);
538
539         return err;
540 }
541
542 static inline int blk_send_start_stop(struct request_queue *q,
543                                       struct gendisk *bd_disk, int data)
544 {
545         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
546 }
547
548 int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
549 {
550 #ifdef CONFIG_COMPAT
551         if (in_compat_syscall()) {
552                 struct compat_sg_io_hdr hdr32 =  {
553                         .interface_id    = hdr->interface_id,
554                         .dxfer_direction = hdr->dxfer_direction,
555                         .cmd_len         = hdr->cmd_len,
556                         .mx_sb_len       = hdr->mx_sb_len,
557                         .iovec_count     = hdr->iovec_count,
558                         .dxfer_len       = hdr->dxfer_len,
559                         .dxferp          = (uintptr_t)hdr->dxferp,
560                         .cmdp            = (uintptr_t)hdr->cmdp,
561                         .sbp             = (uintptr_t)hdr->sbp,
562                         .timeout         = hdr->timeout,
563                         .flags           = hdr->flags,
564                         .pack_id         = hdr->pack_id,
565                         .usr_ptr         = (uintptr_t)hdr->usr_ptr,
566                         .status          = hdr->status,
567                         .masked_status   = hdr->masked_status,
568                         .msg_status      = hdr->msg_status,
569                         .sb_len_wr       = hdr->sb_len_wr,
570                         .host_status     = hdr->host_status,
571                         .driver_status   = hdr->driver_status,
572                         .resid           = hdr->resid,
573                         .duration        = hdr->duration,
574                         .info            = hdr->info,
575                 };
576
577                 if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
578                         return -EFAULT;
579
580                 return 0;
581         }
582 #endif
583
584         if (copy_to_user(argp, hdr, sizeof(*hdr)))
585                 return -EFAULT;
586
587         return 0;
588 }
589 EXPORT_SYMBOL(put_sg_io_hdr);
590
591 int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
592 {
593 #ifdef CONFIG_COMPAT
594         struct compat_sg_io_hdr hdr32;
595
596         if (in_compat_syscall()) {
597                 if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
598                         return -EFAULT;
599
600                 *hdr = (struct sg_io_hdr) {
601                         .interface_id    = hdr32.interface_id,
602                         .dxfer_direction = hdr32.dxfer_direction,
603                         .cmd_len         = hdr32.cmd_len,
604                         .mx_sb_len       = hdr32.mx_sb_len,
605                         .iovec_count     = hdr32.iovec_count,
606                         .dxfer_len       = hdr32.dxfer_len,
607                         .dxferp          = compat_ptr(hdr32.dxferp),
608                         .cmdp            = compat_ptr(hdr32.cmdp),
609                         .sbp             = compat_ptr(hdr32.sbp),
610                         .timeout         = hdr32.timeout,
611                         .flags           = hdr32.flags,
612                         .pack_id         = hdr32.pack_id,
613                         .usr_ptr         = compat_ptr(hdr32.usr_ptr),
614                         .status          = hdr32.status,
615                         .masked_status   = hdr32.masked_status,
616                         .msg_status      = hdr32.msg_status,
617                         .sb_len_wr       = hdr32.sb_len_wr,
618                         .host_status     = hdr32.host_status,
619                         .driver_status   = hdr32.driver_status,
620                         .resid           = hdr32.resid,
621                         .duration        = hdr32.duration,
622                         .info            = hdr32.info,
623                 };
624
625                 return 0;
626         }
627 #endif
628
629         if (copy_from_user(hdr, argp, sizeof(*hdr)))
630                 return -EFAULT;
631
632         return 0;
633 }
634 EXPORT_SYMBOL(get_sg_io_hdr);
635
636 #ifdef CONFIG_COMPAT
637 struct compat_cdrom_generic_command {
638         unsigned char   cmd[CDROM_PACKET_SIZE];
639         compat_caddr_t  buffer;
640         compat_uint_t   buflen;
641         compat_int_t    stat;
642         compat_caddr_t  sense;
643         unsigned char   data_direction;
644         unsigned char   pad[3];
645         compat_int_t    quiet;
646         compat_int_t    timeout;
647         compat_caddr_t  unused;
648 };
649 #endif
650
651 static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
652                                       const void __user *arg)
653 {
654 #ifdef CONFIG_COMPAT
655         if (in_compat_syscall()) {
656                 struct compat_cdrom_generic_command cgc32;
657
658                 if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
659                         return -EFAULT;
660
661                 *cgc = (struct cdrom_generic_command) {
662                         .buffer         = compat_ptr(cgc32.buffer),
663                         .buflen         = cgc32.buflen,
664                         .stat           = cgc32.stat,
665                         .sense          = compat_ptr(cgc32.sense),
666                         .data_direction = cgc32.data_direction,
667                         .quiet          = cgc32.quiet,
668                         .timeout        = cgc32.timeout,
669                         .unused         = compat_ptr(cgc32.unused),
670                 };
671                 memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
672                 return 0;
673         }
674 #endif
675         if (copy_from_user(cgc, arg, sizeof(*cgc)))
676                 return -EFAULT;
677
678         return 0;
679 }
680
681 static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
682                                       void __user *arg)
683 {
684 #ifdef CONFIG_COMPAT
685         if (in_compat_syscall()) {
686                 struct compat_cdrom_generic_command cgc32 = {
687                         .buffer         = (uintptr_t)(cgc->buffer),
688                         .buflen         = cgc->buflen,
689                         .stat           = cgc->stat,
690                         .sense          = (uintptr_t)(cgc->sense),
691                         .data_direction = cgc->data_direction,
692                         .quiet          = cgc->quiet,
693                         .timeout        = cgc->timeout,
694                         .unused         = (uintptr_t)(cgc->unused),
695                 };
696                 memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
697
698                 if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
699                         return -EFAULT;
700
701                 return 0;
702         }
703 #endif
704         if (copy_to_user(arg, cgc, sizeof(*cgc)))
705                 return -EFAULT;
706
707         return 0;
708 }
709
710 static int scsi_cdrom_send_packet(struct request_queue *q,
711                                   struct gendisk *bd_disk,
712                                   fmode_t mode, void __user *arg)
713 {
714         struct cdrom_generic_command cgc;
715         struct sg_io_hdr hdr;
716         int err;
717
718         err = scsi_get_cdrom_generic_arg(&cgc, arg);
719         if (err)
720                 return err;
721
722         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
723         memset(&hdr, 0, sizeof(hdr));
724         hdr.interface_id = 'S';
725         hdr.cmd_len = sizeof(cgc.cmd);
726         hdr.dxfer_len = cgc.buflen;
727         switch (cgc.data_direction) {
728                 case CGC_DATA_UNKNOWN:
729                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
730                         break;
731                 case CGC_DATA_WRITE:
732                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
733                         break;
734                 case CGC_DATA_READ:
735                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
736                         break;
737                 case CGC_DATA_NONE:
738                         hdr.dxfer_direction = SG_DXFER_NONE;
739                         break;
740                 default:
741                         return -EINVAL;
742         }
743
744         hdr.dxferp = cgc.buffer;
745         hdr.sbp = cgc.sense;
746         if (hdr.sbp)
747                 hdr.mx_sb_len = sizeof(struct request_sense);
748         hdr.timeout = jiffies_to_msecs(cgc.timeout);
749         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
750         hdr.cmd_len = sizeof(cgc.cmd);
751
752         err = sg_io(q, bd_disk, &hdr, mode);
753         if (err == -EFAULT)
754                 return -EFAULT;
755
756         if (hdr.status)
757                 return -EIO;
758
759         cgc.stat = err;
760         cgc.buflen = hdr.resid;
761         if (scsi_put_cdrom_generic_arg(&cgc, arg))
762                 return -EFAULT;
763
764         return err;
765 }
766
767 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
768                    unsigned int cmd, void __user *arg)
769 {
770         int err;
771
772         if (!q)
773                 return -ENXIO;
774
775         switch (cmd) {
776                 /*
777                  * new sgv3 interface
778                  */
779                 case SG_GET_VERSION_NUM:
780                         err = sg_get_version(arg);
781                         break;
782                 case SCSI_IOCTL_GET_IDLUN:
783                         err = scsi_get_idlun(q, arg);
784                         break;
785                 case SCSI_IOCTL_GET_BUS_NUMBER:
786                         err = scsi_get_bus(q, arg);
787                         break;
788                 case SG_SET_TIMEOUT:
789                         err = sg_set_timeout(q, arg);
790                         break;
791                 case SG_GET_TIMEOUT:
792                         err = sg_get_timeout(q);
793                         break;
794                 case SG_GET_RESERVED_SIZE:
795                         err = sg_get_reserved_size(q, arg);
796                         break;
797                 case SG_SET_RESERVED_SIZE:
798                         err = sg_set_reserved_size(q, arg);
799                         break;
800                 case SG_EMULATED_HOST:
801                         err = sg_emulated_host(q, arg);
802                         break;
803                 case SG_IO: {
804                         struct sg_io_hdr hdr;
805
806                         err = get_sg_io_hdr(&hdr, arg);
807                         if (err)
808                                 break;
809                         err = sg_io(q, bd_disk, &hdr, mode);
810                         if (err == -EFAULT)
811                                 break;
812
813                         if (put_sg_io_hdr(&hdr, arg))
814                                 err = -EFAULT;
815                         break;
816                 }
817                 case CDROM_SEND_PACKET:
818                         err = scsi_cdrom_send_packet(q, bd_disk, mode, arg);
819                         break;
820
821                 /*
822                  * old junk scsi send command ioctl
823                  */
824                 case SCSI_IOCTL_SEND_COMMAND:
825                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
826                         err = -EINVAL;
827                         if (!arg)
828                                 break;
829
830                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
831                         break;
832                 case CDROMCLOSETRAY:
833                         err = blk_send_start_stop(q, bd_disk, 0x03);
834                         break;
835                 case CDROMEJECT:
836                         err = blk_send_start_stop(q, bd_disk, 0x02);
837                         break;
838                 default:
839                         err = -ENOTTY;
840         }
841
842         return err;
843 }
844 EXPORT_SYMBOL(scsi_cmd_ioctl);
845
846 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
847 {
848         if (bd && !bdev_is_partition(bd))
849                 return 0;
850
851         if (capable(CAP_SYS_RAWIO))
852                 return 0;
853
854         return -ENOIOCTLCMD;
855 }
856 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
857
858 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
859                        unsigned int cmd, void __user *arg)
860 {
861         int ret;
862
863         ret = scsi_verify_blk_ioctl(bd, cmd);
864         if (ret < 0)
865                 return ret;
866
867         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
868 }
869 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
870
871 /**
872  * scsi_req_init - initialize certain fields of a scsi_request structure
873  * @req: Pointer to a scsi_request structure.
874  * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
875  * of struct scsi_request.
876  */
877 void scsi_req_init(struct scsi_request *req)
878 {
879         memset(req->__cmd, 0, sizeof(req->__cmd));
880         req->cmd = req->__cmd;
881         req->cmd_len = BLK_MAX_CDB;
882         req->sense_len = 0;
883 }
884 EXPORT_SYMBOL(scsi_req_init);
885
886 static int __init blk_scsi_ioctl_init(void)
887 {
888         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
889         return 0;
890 }
891 fs_initcall(blk_scsi_ioctl_init);