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 <linux/uio.h>
31#include <asm/uaccess.h>
32
33#include <scsi/scsi.h>
34#include <scsi/scsi_ioctl.h>
35#include <scsi/scsi_cmnd.h>
36
37struct blk_cmd_filter {
38    unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
39    unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
40};
41
42static struct blk_cmd_filter blk_default_cmd_filter;
43
44/* Command group 3 is reserved and should never be used. */
45const unsigned char scsi_command_size_tbl[8] =
46{
47    6, 10, 10, 12,
48    16, 12, 10, 10
49};
50EXPORT_SYMBOL(scsi_command_size_tbl);
51
52#include <scsi/sg.h>
53
54static int sg_get_version(int __user *p)
55{
56    static const int sg_version_num = 30527;
57    return put_user(sg_version_num, p);
58}
59
60static int scsi_get_idlun(struct request_queue *q, int __user *p)
61{
62    return put_user(0, p);
63}
64
65static int scsi_get_bus(struct request_queue *q, int __user *p)
66{
67    return put_user(0, p);
68}
69
70static int sg_get_timeout(struct request_queue *q)
71{
72    return jiffies_to_clock_t(q->sg_timeout);
73}
74
75static int sg_set_timeout(struct request_queue *q, int __user *p)
76{
77    int timeout, err = get_user(timeout, p);
78
79    if (!err)
80        q->sg_timeout = clock_t_to_jiffies(timeout);
81
82    return err;
83}
84
85static int sg_get_reserved_size(struct request_queue *q, int __user *p)
86{
87    unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
88
89    return put_user(val, p);
90}
91
92static int sg_set_reserved_size(struct request_queue *q, int __user *p)
93{
94    int size, err = get_user(size, p);
95
96    if (err)
97        return err;
98
99    if (size < 0)
100        return -EINVAL;
101    if (size > (queue_max_sectors(q) << 9))
102        size = queue_max_sectors(q) << 9;
103
104    q->sg_reserved_size = size;
105    return 0;
106}
107
108/*
109 * will always return that we are ATAPI even for a real SCSI drive, I'm not
110 * so sure this is worth doing anything about (why would you care??)
111 */
112static int sg_emulated_host(struct request_queue *q, int __user *p)
113{
114    return put_user(1, p);
115}
116
117static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
118{
119    /* Basic read-only commands */
120    __set_bit(TEST_UNIT_READY, filter->read_ok);
121    __set_bit(REQUEST_SENSE, filter->read_ok);
122    __set_bit(READ_6, filter->read_ok);
123    __set_bit(READ_10, filter->read_ok);
124    __set_bit(READ_12, filter->read_ok);
125    __set_bit(READ_16, filter->read_ok);
126    __set_bit(READ_BUFFER, filter->read_ok);
127    __set_bit(READ_DEFECT_DATA, filter->read_ok);
128    __set_bit(READ_CAPACITY, filter->read_ok);
129    __set_bit(READ_LONG, filter->read_ok);
130    __set_bit(INQUIRY, filter->read_ok);
131    __set_bit(MODE_SENSE, filter->read_ok);
132    __set_bit(MODE_SENSE_10, filter->read_ok);
133    __set_bit(LOG_SENSE, filter->read_ok);
134    __set_bit(START_STOP, filter->read_ok);
135    __set_bit(GPCMD_VERIFY_10, filter->read_ok);
136    __set_bit(VERIFY_16, filter->read_ok);
137    __set_bit(REPORT_LUNS, filter->read_ok);
138    __set_bit(SERVICE_ACTION_IN, filter->read_ok);
139    __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
140    __set_bit(MAINTENANCE_IN, filter->read_ok);
141    __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
142
143    /* Audio CD commands */
144    __set_bit(GPCMD_PLAY_CD, filter->read_ok);
145    __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
146    __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
147    __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
148    __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
149
150    /* CD/DVD data reading */
151    __set_bit(GPCMD_READ_CD, filter->read_ok);
152    __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
153    __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
154    __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
155    __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
156    __set_bit(GPCMD_READ_HEADER, filter->read_ok);
157    __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
158    __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
159    __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
160    __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
161    __set_bit(GPCMD_SCAN, filter->read_ok);
162    __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
163    __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
164    __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
165    __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
166    __set_bit(GPCMD_SEEK, filter->read_ok);
167    __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
168
169    /* Basic writing commands */
170    __set_bit(WRITE_6, filter->write_ok);
171    __set_bit(WRITE_10, filter->write_ok);
172    __set_bit(WRITE_VERIFY, filter->write_ok);
173    __set_bit(WRITE_12, filter->write_ok);
174    __set_bit(WRITE_VERIFY_12, filter->write_ok);
175    __set_bit(WRITE_16, filter->write_ok);
176    __set_bit(WRITE_LONG, filter->write_ok);
177    __set_bit(WRITE_LONG_2, filter->write_ok);
178    __set_bit(ERASE, filter->write_ok);
179    __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
180    __set_bit(MODE_SELECT, filter->write_ok);
181    __set_bit(LOG_SELECT, filter->write_ok);
182    __set_bit(GPCMD_BLANK, filter->write_ok);
183    __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
184    __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
185    __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
186    __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
187    __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
188    __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
189    __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
190    __set_bit(GPCMD_SEND_KEY, filter->write_ok);
191    __set_bit(GPCMD_SEND_OPC, filter->write_ok);
192    __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
193    __set_bit(GPCMD_SET_SPEED, filter->write_ok);
194    __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
195    __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
196    __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
197    __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
198}
199
200int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
201{
202    struct blk_cmd_filter *filter = &blk_default_cmd_filter;
203
204    /* root can do any command. */
205    if (capable(CAP_SYS_RAWIO))
206        return 0;
207
208    /* if there's no filter set, assume we're filtering everything out */
209    if (!filter)
210        return -EPERM;
211
212    /* Anybody who can open the device can do a read-safe command */
213    if (test_bit(cmd[0], filter->read_ok))
214        return 0;
215
216    /* Write-safe commands require a writable open */
217    if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
218        return 0;
219
220    return -EPERM;
221}
222EXPORT_SYMBOL(blk_verify_command);
223
224static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
225                 struct sg_io_hdr *hdr, fmode_t mode)
226{
227    if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
228        return -EFAULT;
229    if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
230        return -EPERM;
231
232    /*
233     * fill in request structure
234     */
235    rq->cmd_len = hdr->cmd_len;
236    rq->cmd_type = REQ_TYPE_BLOCK_PC;
237
238    rq->timeout = msecs_to_jiffies(hdr->timeout);
239    if (!rq->timeout)
240        rq->timeout = q->sg_timeout;
241    if (!rq->timeout)
242        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
243    if (rq->timeout < BLK_MIN_SG_TIMEOUT)
244        rq->timeout = BLK_MIN_SG_TIMEOUT;
245
246    return 0;
247}
248
249static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
250                 struct bio *bio)
251{
252    int r, ret = 0;
253
254    /*
255     * fill in all the output members
256     */
257    hdr->status = rq->errors & 0xff;
258    hdr->masked_status = status_byte(rq->errors);
259    hdr->msg_status = msg_byte(rq->errors);
260    hdr->host_status = host_byte(rq->errors);
261    hdr->driver_status = driver_byte(rq->errors);
262    hdr->info = 0;
263    if (hdr->masked_status || hdr->host_status || hdr->driver_status)
264        hdr->info |= SG_INFO_CHECK;
265    hdr->resid = rq->resid_len;
266    hdr->sb_len_wr = 0;
267
268    if (rq->sense_len && hdr->sbp) {
269        int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
270
271        if (!copy_to_user(hdr->sbp, rq->sense, len))
272            hdr->sb_len_wr = len;
273        else
274            ret = -EFAULT;
275    }
276
277    r = blk_rq_unmap_user(bio);
278    if (!ret)
279        ret = r;
280    blk_put_request(rq);
281
282    return ret;
283}
284
285static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
286        struct sg_io_hdr *hdr, fmode_t mode)
287{
288    unsigned long start_time;
289    int writing = 0, ret = 0;
290    struct request *rq;
291    char sense[SCSI_SENSE_BUFFERSIZE];
292    struct bio *bio;
293
294    if (hdr->interface_id != 'S')
295        return -EINVAL;
296    if (hdr->cmd_len > BLK_MAX_CDB)
297        return -EINVAL;
298
299    if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
300        return -EIO;
301
302    if (hdr->dxfer_len)
303        switch (hdr->dxfer_direction) {
304        default:
305            return -EINVAL;
306        case SG_DXFER_TO_DEV:
307            writing = 1;
308            break;
309        case SG_DXFER_TO_FROM_DEV:
310        case SG_DXFER_FROM_DEV:
311            break;
312        }
313
314    rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
315    if (!rq)
316        return -ENOMEM;
317
318    if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
319        blk_put_request(rq);
320        return -EFAULT;
321    }
322
323    if (hdr->iovec_count) {
324        const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
325        size_t iov_data_len;
326        struct sg_iovec *sg_iov;
327        struct iovec *iov;
328        int i;
329
330        sg_iov = kmalloc(size, GFP_KERNEL);
331        if (!sg_iov) {
332            ret = -ENOMEM;
333            goto out;
334        }
335
336        if (copy_from_user(sg_iov, hdr->dxferp, size)) {
337            kfree(sg_iov);
338            ret = -EFAULT;
339            goto out;
340        }
341
342        /*
343         * Sum up the vecs, making sure they don't overflow
344         */
345        iov = (struct iovec *) sg_iov;
346        iov_data_len = 0;
347        for (i = 0; i < hdr->iovec_count; i++) {
348            if (iov_data_len + iov[i].iov_len < iov_data_len) {
349                kfree(sg_iov);
350                ret = -EINVAL;
351                goto out;
352            }
353            iov_data_len += iov[i].iov_len;
354        }
355
356        /* SG_IO howto says that the shorter of the two wins */
357        if (hdr->dxfer_len < iov_data_len) {
358            hdr->iovec_count = iov_shorten(iov,
359                               hdr->iovec_count,
360                               hdr->dxfer_len);
361            iov_data_len = hdr->dxfer_len;
362        }
363
364        ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
365                      iov_data_len, GFP_KERNEL);
366        kfree(sg_iov);
367    } else if (hdr->dxfer_len)
368        ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
369                      GFP_KERNEL);
370
371    if (ret)
372        goto out;
373
374    bio = rq->bio;
375    memset(sense, 0, sizeof(sense));
376    rq->sense = sense;
377    rq->sense_len = 0;
378    rq->retries = 0;
379
380    start_time = jiffies;
381
382    /* ignore return value. All information is passed back to caller
383     * (if he doesn't check that is his problem).
384     * N.B. a non-zero SCSI status is _not_ necessarily an error.
385     */
386    blk_execute_rq(q, bd_disk, rq, 0);
387
388    hdr->duration = jiffies_to_msecs(jiffies - start_time);
389
390    return blk_complete_sghdr_rq(rq, hdr, bio);
391out:
392    blk_put_request(rq);
393    return ret;
394}
395
396/**
397 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
398 * @file: file this ioctl operates on (optional)
399 * @q: request queue to send scsi commands down
400 * @disk: gendisk to operate on (option)
401 * @sic: userspace structure describing the command to perform
402 *
403 * Send down the scsi command described by @sic to the device below
404 * the request queue @q. If @file is non-NULL it's used to perform
405 * fine-grained permission checks that allow users to send down
406 * non-destructive SCSI commands. If the caller has a struct gendisk
407 * available it should be passed in as @disk to allow the low level
408 * driver to use the information contained in it. A non-NULL @disk
409 * is only allowed if the caller knows that the low level driver doesn't
410 * need it (e.g. in the scsi subsystem).
411 *
412 * Notes:
413 * - This interface is deprecated - users should use the SG_IO
414 * interface instead, as this is a more flexible approach to
415 * performing SCSI commands on a device.
416 * - The SCSI command length is determined by examining the 1st byte
417 * of the given command. There is no way to override this.
418 * - Data transfers are limited to PAGE_SIZE
419 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
420 * accommodate the sense buffer when an error occurs.
421 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
422 * old code will not be surprised.
423 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
424 * a negative return and the Unix error code in 'errno'.
425 * If the SCSI command succeeds then 0 is returned.
426 * Positive numbers returned are the compacted SCSI error codes (4
427 * bytes in one int) where the lowest byte is the SCSI status.
428 */
429#define OMAX_SB_LEN 16 /* For backward compatibility */
430int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
431        struct scsi_ioctl_command __user *sic)
432{
433    struct request *rq;
434    int err;
435    unsigned int in_len, out_len, bytes, opcode, cmdlen;
436    char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
437
438    if (!sic)
439        return -EINVAL;
440
441    /*
442     * get in an out lengths, verify they don't exceed a page worth of data
443     */
444    if (get_user(in_len, &sic->inlen))
445        return -EFAULT;
446    if (get_user(out_len, &sic->outlen))
447        return -EFAULT;
448    if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
449        return -EINVAL;
450    if (get_user(opcode, sic->data))
451        return -EFAULT;
452
453    bytes = max(in_len, out_len);
454    if (bytes) {
455        buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
456        if (!buffer)
457            return -ENOMEM;
458
459    }
460
461    rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
462
463    cmdlen = COMMAND_SIZE(opcode);
464
465    /*
466     * get command and data to send to device, if any
467     */
468    err = -EFAULT;
469    rq->cmd_len = cmdlen;
470    if (copy_from_user(rq->cmd, sic->data, cmdlen))
471        goto error;
472
473    if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
474        goto error;
475
476    err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
477    if (err)
478        goto error;
479
480    /* default. possible overriden later */
481    rq->retries = 5;
482
483    switch (opcode) {
484    case SEND_DIAGNOSTIC:
485    case FORMAT_UNIT:
486        rq->timeout = FORMAT_UNIT_TIMEOUT;
487        rq->retries = 1;
488        break;
489    case START_STOP:
490        rq->timeout = START_STOP_TIMEOUT;
491        break;
492    case MOVE_MEDIUM:
493        rq->timeout = MOVE_MEDIUM_TIMEOUT;
494        break;
495    case READ_ELEMENT_STATUS:
496        rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
497        break;
498    case READ_DEFECT_DATA:
499        rq->timeout = READ_DEFECT_DATA_TIMEOUT;
500        rq->retries = 1;
501        break;
502    default:
503        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
504        break;
505    }
506
507    if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
508        err = DRIVER_ERROR << 24;
509        goto out;
510    }
511
512    memset(sense, 0, sizeof(sense));
513    rq->sense = sense;
514    rq->sense_len = 0;
515    rq->cmd_type = REQ_TYPE_BLOCK_PC;
516
517    blk_execute_rq(q, disk, rq, 0);
518
519out:
520    err = rq->errors & 0xff; /* only 8 bit SCSI status */
521    if (err) {
522        if (rq->sense_len && rq->sense) {
523            bytes = (OMAX_SB_LEN > rq->sense_len) ?
524                rq->sense_len : OMAX_SB_LEN;
525            if (copy_to_user(sic->data, rq->sense, bytes))
526                err = -EFAULT;
527        }
528    } else {
529        if (copy_to_user(sic->data, buffer, out_len))
530            err = -EFAULT;
531    }
532    
533error:
534    kfree(buffer);
535    blk_put_request(rq);
536    return err;
537}
538EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
539
540/* Send basic block requests */
541static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
542                  int cmd, int data)
543{
544    struct request *rq;
545    int err;
546
547    rq = blk_get_request(q, WRITE, __GFP_WAIT);
548    rq->cmd_type = REQ_TYPE_BLOCK_PC;
549    rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
550    rq->cmd[0] = cmd;
551    rq->cmd[4] = data;
552    rq->cmd_len = 6;
553    err = blk_execute_rq(q, bd_disk, rq, 0);
554    blk_put_request(rq);
555
556    return err;
557}
558
559static inline int blk_send_start_stop(struct request_queue *q,
560                      struct gendisk *bd_disk, int data)
561{
562    return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
563}
564
565int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
566           unsigned int cmd, void __user *arg)
567{
568    int err;
569
570    if (!q)
571        return -ENXIO;
572
573    switch (cmd) {
574        /*
575         * new sgv3 interface
576         */
577        case SG_GET_VERSION_NUM:
578            err = sg_get_version(arg);
579            break;
580        case SCSI_IOCTL_GET_IDLUN:
581            err = scsi_get_idlun(q, arg);
582            break;
583        case SCSI_IOCTL_GET_BUS_NUMBER:
584            err = scsi_get_bus(q, arg);
585            break;
586        case SG_SET_TIMEOUT:
587            err = sg_set_timeout(q, arg);
588            break;
589        case SG_GET_TIMEOUT:
590            err = sg_get_timeout(q);
591            break;
592        case SG_GET_RESERVED_SIZE:
593            err = sg_get_reserved_size(q, arg);
594            break;
595        case SG_SET_RESERVED_SIZE:
596            err = sg_set_reserved_size(q, arg);
597            break;
598        case SG_EMULATED_HOST:
599            err = sg_emulated_host(q, arg);
600            break;
601        case SG_IO: {
602            struct sg_io_hdr hdr;
603
604            err = -EFAULT;
605            if (copy_from_user(&hdr, arg, sizeof(hdr)))
606                break;
607            err = sg_io(q, bd_disk, &hdr, mode);
608            if (err == -EFAULT)
609                break;
610
611            if (copy_to_user(arg, &hdr, sizeof(hdr)))
612                err = -EFAULT;
613            break;
614        }
615        case CDROM_SEND_PACKET: {
616            struct cdrom_generic_command cgc;
617            struct sg_io_hdr hdr;
618
619            err = -EFAULT;
620            if (copy_from_user(&cgc, arg, sizeof(cgc)))
621                break;
622            cgc.timeout = clock_t_to_jiffies(cgc.timeout);
623            memset(&hdr, 0, sizeof(hdr));
624            hdr.interface_id = 'S';
625            hdr.cmd_len = sizeof(cgc.cmd);
626            hdr.dxfer_len = cgc.buflen;
627            err = 0;
628            switch (cgc.data_direction) {
629                case CGC_DATA_UNKNOWN:
630                    hdr.dxfer_direction = SG_DXFER_UNKNOWN;
631                    break;
632                case CGC_DATA_WRITE:
633                    hdr.dxfer_direction = SG_DXFER_TO_DEV;
634                    break;
635                case CGC_DATA_READ:
636                    hdr.dxfer_direction = SG_DXFER_FROM_DEV;
637                    break;
638                case CGC_DATA_NONE:
639                    hdr.dxfer_direction = SG_DXFER_NONE;
640                    break;
641                default:
642                    err = -EINVAL;
643            }
644            if (err)
645                break;
646
647            hdr.dxferp = cgc.buffer;
648            hdr.sbp = cgc.sense;
649            if (hdr.sbp)
650                hdr.mx_sb_len = sizeof(struct request_sense);
651            hdr.timeout = jiffies_to_msecs(cgc.timeout);
652            hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
653            hdr.cmd_len = sizeof(cgc.cmd);
654
655            err = sg_io(q, bd_disk, &hdr, mode);
656            if (err == -EFAULT)
657                break;
658
659            if (hdr.status)
660                err = -EIO;
661
662            cgc.stat = err;
663            cgc.buflen = hdr.resid;
664            if (copy_to_user(arg, &cgc, sizeof(cgc)))
665                err = -EFAULT;
666
667            break;
668        }
669
670        /*
671         * old junk scsi send command ioctl
672         */
673        case SCSI_IOCTL_SEND_COMMAND:
674            printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
675            err = -EINVAL;
676            if (!arg)
677                break;
678
679            err = sg_scsi_ioctl(q, bd_disk, mode, arg);
680            break;
681        case CDROMCLOSETRAY:
682            err = blk_send_start_stop(q, bd_disk, 0x03);
683            break;
684        case CDROMEJECT:
685            err = blk_send_start_stop(q, bd_disk, 0x02);
686            break;
687        default:
688            err = -ENOTTY;
689    }
690
691    return err;
692}
693EXPORT_SYMBOL(scsi_cmd_ioctl);
694
695int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
696{
697    if (bd && bd == bd->bd_contains)
698        return 0;
699
700    /* Actually none of these is particularly useful on a partition,
701     * but they are safe.
702     */
703    switch (cmd) {
704    case SCSI_IOCTL_GET_IDLUN:
705    case SCSI_IOCTL_GET_BUS_NUMBER:
706    case SCSI_IOCTL_GET_PCI:
707    case SCSI_IOCTL_PROBE_HOST:
708    case SG_GET_VERSION_NUM:
709    case SG_SET_TIMEOUT:
710    case SG_GET_TIMEOUT:
711    case SG_GET_RESERVED_SIZE:
712    case SG_SET_RESERVED_SIZE:
713    case SG_EMULATED_HOST:
714        return 0;
715    case CDROM_GET_CAPABILITY:
716        /* Keep this until we remove the printk below. udev sends it
717         * and we do not want to spam dmesg about it. CD-ROMs do
718         * not have partitions, so we get here only for disks.
719         */
720        return -ENOIOCTLCMD;
721    default:
722        break;
723    }
724
725    if (capable(CAP_SYS_RAWIO))
726        return 0;
727
728    /* In particular, rule out all resets and host-specific ioctls. */
729    printk_ratelimited(KERN_WARNING
730               "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
731
732    return -ENOIOCTLCMD;
733}
734EXPORT_SYMBOL(scsi_verify_blk_ioctl);
735
736int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
737               unsigned int cmd, void __user *arg)
738{
739    int ret;
740
741    ret = scsi_verify_blk_ioctl(bd, cmd);
742    if (ret < 0)
743        return ret;
744
745    return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
746}
747EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
748
749static int __init blk_scsi_ioctl_init(void)
750{
751    blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
752    return 0;
753}
754fs_initcall(blk_scsi_ioctl_init);
755

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