Root/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
36struct 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
41static struct blk_cmd_filter blk_default_cmd_filter;
42
43/* Command group 3 is reserved and should never be used. */
44const unsigned char scsi_command_size_tbl[8] =
45{
46    6, 10, 10, 12,
47    16, 12, 10, 10
48};
49EXPORT_SYMBOL(scsi_command_size_tbl);
50
51#include <scsi/sg.h>
52
53static 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
59static int scsi_get_idlun(struct request_queue *q, int __user *p)
60{
61    return put_user(0, p);
62}
63
64static int scsi_get_bus(struct request_queue *q, int __user *p)
65{
66    return put_user(0, p);
67}
68
69static int sg_get_timeout(struct request_queue *q)
70{
71    return jiffies_to_clock_t(q->sg_timeout);
72}
73
74static 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
84static 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
91static 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 */
111static int sg_emulated_host(struct request_queue *q, int __user *p)
112{
113    return put_user(1, p);
114}
115
116static 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
199int 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}
221EXPORT_SYMBOL(blk_verify_command);
222
223static 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
248static 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
284static 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);
390out:
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 */
429int 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
518out:
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    
532error:
533    kfree(buffer);
534    blk_put_request(rq);
535    return err;
536}
537EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
538
539/* Send basic block requests */
540static 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
558static 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
564int 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}
692EXPORT_SYMBOL(scsi_cmd_ioctl);
693
694int 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    if (capable(CAP_SYS_RAWIO))
725        return 0;
726
727    /* In particular, rule out all resets and host-specific ioctls. */
728    printk_ratelimited(KERN_WARNING
729               "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
730
731    return -ENOIOCTLCMD;
732}
733EXPORT_SYMBOL(scsi_verify_blk_ioctl);
734
735int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
736               unsigned int cmd, void __user *arg)
737{
738    int ret;
739
740    ret = scsi_verify_blk_ioctl(bd, cmd);
741    if (ret < 0)
742        return ret;
743
744    return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
745}
746EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
747
748static int __init blk_scsi_ioctl_init(void)
749{
750    blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
751    return 0;
752}
753fs_initcall(blk_scsi_ioctl_init);
754

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