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} blk_default_cmd_filter;
39
40/* Command group 3 is reserved and should never be used. */
41const unsigned char scsi_command_size_tbl[8] =
42{
43    6, 10, 10, 12,
44    16, 12, 10, 10
45};
46EXPORT_SYMBOL(scsi_command_size_tbl);
47
48#include <scsi/sg.h>
49
50static int sg_get_version(int __user *p)
51{
52    static const int sg_version_num = 30527;
53    return put_user(sg_version_num, p);
54}
55
56static int scsi_get_idlun(struct request_queue *q, int __user *p)
57{
58    return put_user(0, p);
59}
60
61static int scsi_get_bus(struct request_queue *q, int __user *p)
62{
63    return put_user(0, p);
64}
65
66static int sg_get_timeout(struct request_queue *q)
67{
68    return jiffies_to_clock_t(q->sg_timeout);
69}
70
71static int sg_set_timeout(struct request_queue *q, int __user *p)
72{
73    int timeout, err = get_user(timeout, p);
74
75    if (!err)
76        q->sg_timeout = clock_t_to_jiffies(timeout);
77
78    return err;
79}
80
81static int sg_get_reserved_size(struct request_queue *q, int __user *p)
82{
83    unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
84
85    return put_user(val, p);
86}
87
88static int sg_set_reserved_size(struct request_queue *q, int __user *p)
89{
90    int size, err = get_user(size, p);
91
92    if (err)
93        return err;
94
95    if (size < 0)
96        return -EINVAL;
97    if (size > (queue_max_sectors(q) << 9))
98        size = queue_max_sectors(q) << 9;
99
100    q->sg_reserved_size = size;
101    return 0;
102}
103
104/*
105 * will always return that we are ATAPI even for a real SCSI drive, I'm not
106 * so sure this is worth doing anything about (why would you care??)
107 */
108static int sg_emulated_host(struct request_queue *q, int __user *p)
109{
110    return put_user(1, p);
111}
112
113static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
114{
115    /* Basic read-only commands */
116    __set_bit(TEST_UNIT_READY, filter->read_ok);
117    __set_bit(REQUEST_SENSE, filter->read_ok);
118    __set_bit(READ_6, filter->read_ok);
119    __set_bit(READ_10, filter->read_ok);
120    __set_bit(READ_12, filter->read_ok);
121    __set_bit(READ_16, filter->read_ok);
122    __set_bit(READ_BUFFER, filter->read_ok);
123    __set_bit(READ_DEFECT_DATA, filter->read_ok);
124    __set_bit(READ_CAPACITY, filter->read_ok);
125    __set_bit(READ_LONG, filter->read_ok);
126    __set_bit(INQUIRY, filter->read_ok);
127    __set_bit(MODE_SENSE, filter->read_ok);
128    __set_bit(MODE_SENSE_10, filter->read_ok);
129    __set_bit(LOG_SENSE, filter->read_ok);
130    __set_bit(START_STOP, filter->read_ok);
131    __set_bit(GPCMD_VERIFY_10, filter->read_ok);
132    __set_bit(VERIFY_16, filter->read_ok);
133    __set_bit(REPORT_LUNS, filter->read_ok);
134    __set_bit(SERVICE_ACTION_IN, filter->read_ok);
135    __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
136    __set_bit(MAINTENANCE_IN, filter->read_ok);
137    __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
138
139    /* Audio CD commands */
140    __set_bit(GPCMD_PLAY_CD, filter->read_ok);
141    __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
142    __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
143    __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
144    __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
145
146    /* CD/DVD data reading */
147    __set_bit(GPCMD_READ_CD, filter->read_ok);
148    __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
149    __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
150    __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
151    __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
152    __set_bit(GPCMD_READ_HEADER, filter->read_ok);
153    __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
154    __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
155    __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
156    __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
157    __set_bit(GPCMD_SCAN, filter->read_ok);
158    __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
159    __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
160    __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
161    __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
162    __set_bit(GPCMD_SEEK, filter->read_ok);
163    __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
164
165    /* Basic writing commands */
166    __set_bit(WRITE_6, filter->write_ok);
167    __set_bit(WRITE_10, filter->write_ok);
168    __set_bit(WRITE_VERIFY, filter->write_ok);
169    __set_bit(WRITE_12, filter->write_ok);
170    __set_bit(WRITE_VERIFY_12, filter->write_ok);
171    __set_bit(WRITE_16, filter->write_ok);
172    __set_bit(WRITE_LONG, filter->write_ok);
173    __set_bit(WRITE_LONG_2, 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
196int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
197{
198    struct blk_cmd_filter *filter = &blk_default_cmd_filter;
199
200    /* root can do any command. */
201    if (capable(CAP_SYS_RAWIO))
202        return 0;
203
204    /* if there's no filter set, assume we're filtering everything out */
205    if (!filter)
206        return -EPERM;
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) && has_write_perm)
214        return 0;
215
216    return -EPERM;
217}
218EXPORT_SYMBOL(blk_verify_command);
219
220static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
221                 struct sg_io_hdr *hdr, fmode_t mode)
222{
223    if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
224        return -EFAULT;
225    if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
226        return -EPERM;
227
228    /*
229     * fill in request structure
230     */
231    rq->cmd_len = hdr->cmd_len;
232    rq->cmd_type = REQ_TYPE_BLOCK_PC;
233
234    rq->timeout = msecs_to_jiffies(hdr->timeout);
235    if (!rq->timeout)
236        rq->timeout = q->sg_timeout;
237    if (!rq->timeout)
238        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
239    if (rq->timeout < BLK_MIN_SG_TIMEOUT)
240        rq->timeout = BLK_MIN_SG_TIMEOUT;
241
242    return 0;
243}
244
245static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
246                 struct bio *bio)
247{
248    int r, ret = 0;
249
250    /*
251     * fill in all the output members
252     */
253    hdr->status = rq->errors & 0xff;
254    hdr->masked_status = status_byte(rq->errors);
255    hdr->msg_status = msg_byte(rq->errors);
256    hdr->host_status = host_byte(rq->errors);
257    hdr->driver_status = driver_byte(rq->errors);
258    hdr->info = 0;
259    if (hdr->masked_status || hdr->host_status || hdr->driver_status)
260        hdr->info |= SG_INFO_CHECK;
261    hdr->resid = rq->resid_len;
262    hdr->sb_len_wr = 0;
263
264    if (rq->sense_len && hdr->sbp) {
265        int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
266
267        if (!copy_to_user(hdr->sbp, rq->sense, len))
268            hdr->sb_len_wr = len;
269        else
270            ret = -EFAULT;
271    }
272
273    r = blk_rq_unmap_user(bio);
274    if (!ret)
275        ret = r;
276    blk_put_request(rq);
277
278    return ret;
279}
280
281static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
282        struct sg_io_hdr *hdr, fmode_t mode)
283{
284    unsigned long start_time;
285    int writing = 0, ret = 0;
286    struct request *rq;
287    char sense[SCSI_SENSE_BUFFERSIZE];
288    struct bio *bio;
289
290    if (hdr->interface_id != 'S')
291        return -EINVAL;
292    if (hdr->cmd_len > BLK_MAX_CDB)
293        return -EINVAL;
294
295    if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
296        return -EIO;
297
298    if (hdr->dxfer_len)
299        switch (hdr->dxfer_direction) {
300        default:
301            return -EINVAL;
302        case SG_DXFER_TO_DEV:
303            writing = 1;
304            break;
305        case SG_DXFER_TO_FROM_DEV:
306        case SG_DXFER_FROM_DEV:
307            break;
308        }
309
310    rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
311    if (!rq)
312        return -ENOMEM;
313
314    if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
315        blk_put_request(rq);
316        return -EFAULT;
317    }
318
319    if (hdr->iovec_count) {
320        const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
321        size_t iov_data_len;
322        struct sg_iovec *iov;
323
324        iov = kmalloc(size, GFP_KERNEL);
325        if (!iov) {
326            ret = -ENOMEM;
327            goto out;
328        }
329
330        if (copy_from_user(iov, hdr->dxferp, size)) {
331            kfree(iov);
332            ret = -EFAULT;
333            goto out;
334        }
335
336        /* SG_IO howto says that the shorter of the two wins */
337        iov_data_len = iov_length((struct iovec *)iov,
338                      hdr->iovec_count);
339        if (hdr->dxfer_len < iov_data_len) {
340            hdr->iovec_count = iov_shorten((struct iovec *)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, iov, hdr->iovec_count,
347                      iov_data_len, GFP_KERNEL);
348        kfree(iov);
349    } else if (hdr->dxfer_len)
350        ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
351                      GFP_KERNEL);
352
353    if (ret)
354        goto out;
355
356    bio = rq->bio;
357    memset(sense, 0, sizeof(sense));
358    rq->sense = sense;
359    rq->sense_len = 0;
360    rq->retries = 0;
361
362    start_time = jiffies;
363
364    /* ignore return value. All information is passed back to caller
365     * (if he doesn't check that is his problem).
366     * N.B. a non-zero SCSI status is _not_ necessarily an error.
367     */
368    blk_execute_rq(q, bd_disk, rq, 0);
369
370    hdr->duration = jiffies_to_msecs(jiffies - start_time);
371
372    return blk_complete_sghdr_rq(rq, hdr, bio);
373out:
374    blk_put_request(rq);
375    return ret;
376}
377
378/**
379 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
380 * @file: file this ioctl operates on (optional)
381 * @q: request queue to send scsi commands down
382 * @disk: gendisk to operate on (option)
383 * @sic: userspace structure describing the command to perform
384 *
385 * Send down the scsi command described by @sic to the device below
386 * the request queue @q. If @file is non-NULL it's used to perform
387 * fine-grained permission checks that allow users to send down
388 * non-destructive SCSI commands. If the caller has a struct gendisk
389 * available it should be passed in as @disk to allow the low level
390 * driver to use the information contained in it. A non-NULL @disk
391 * is only allowed if the caller knows that the low level driver doesn't
392 * need it (e.g. in the scsi subsystem).
393 *
394 * Notes:
395 * - This interface is deprecated - users should use the SG_IO
396 * interface instead, as this is a more flexible approach to
397 * performing SCSI commands on a device.
398 * - The SCSI command length is determined by examining the 1st byte
399 * of the given command. There is no way to override this.
400 * - Data transfers are limited to PAGE_SIZE
401 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
402 * accommodate the sense buffer when an error occurs.
403 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
404 * old code will not be surprised.
405 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
406 * a negative return and the Unix error code in 'errno'.
407 * If the SCSI command succeeds then 0 is returned.
408 * Positive numbers returned are the compacted SCSI error codes (4
409 * bytes in one int) where the lowest byte is the SCSI status.
410 */
411#define OMAX_SB_LEN 16 /* For backward compatibility */
412int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
413        struct scsi_ioctl_command __user *sic)
414{
415    struct request *rq;
416    int err;
417    unsigned int in_len, out_len, bytes, opcode, cmdlen;
418    char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
419
420    if (!sic)
421        return -EINVAL;
422
423    /*
424     * get in an out lengths, verify they don't exceed a page worth of data
425     */
426    if (get_user(in_len, &sic->inlen))
427        return -EFAULT;
428    if (get_user(out_len, &sic->outlen))
429        return -EFAULT;
430    if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
431        return -EINVAL;
432    if (get_user(opcode, sic->data))
433        return -EFAULT;
434
435    bytes = max(in_len, out_len);
436    if (bytes) {
437        buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
438        if (!buffer)
439            return -ENOMEM;
440
441    }
442
443    rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
444
445    cmdlen = COMMAND_SIZE(opcode);
446
447    /*
448     * get command and data to send to device, if any
449     */
450    err = -EFAULT;
451    rq->cmd_len = cmdlen;
452    if (copy_from_user(rq->cmd, sic->data, cmdlen))
453        goto error;
454
455    if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
456        goto error;
457
458    err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
459    if (err)
460        goto error;
461
462    /* default. possible overriden later */
463    rq->retries = 5;
464
465    switch (opcode) {
466    case SEND_DIAGNOSTIC:
467    case FORMAT_UNIT:
468        rq->timeout = FORMAT_UNIT_TIMEOUT;
469        rq->retries = 1;
470        break;
471    case START_STOP:
472        rq->timeout = START_STOP_TIMEOUT;
473        break;
474    case MOVE_MEDIUM:
475        rq->timeout = MOVE_MEDIUM_TIMEOUT;
476        break;
477    case READ_ELEMENT_STATUS:
478        rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
479        break;
480    case READ_DEFECT_DATA:
481        rq->timeout = READ_DEFECT_DATA_TIMEOUT;
482        rq->retries = 1;
483        break;
484    default:
485        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
486        break;
487    }
488
489    if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
490        err = DRIVER_ERROR << 24;
491        goto out;
492    }
493
494    memset(sense, 0, sizeof(sense));
495    rq->sense = sense;
496    rq->sense_len = 0;
497    rq->cmd_type = REQ_TYPE_BLOCK_PC;
498
499    blk_execute_rq(q, disk, rq, 0);
500
501out:
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    
515error:
516    kfree(buffer);
517    blk_put_request(rq);
518    return err;
519}
520EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
521
522/* Send basic block requests */
523static 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
541static 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
547int 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 || blk_get_queue(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    blk_put_queue(q);
674    return err;
675}
676EXPORT_SYMBOL(scsi_cmd_ioctl);
677
678int __init blk_scsi_ioctl_init(void)
679{
680    blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
681    return 0;
682}
683fs_initcall(blk_scsi_ioctl_init);
684

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