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

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