LXR linux/block/scsi

   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 *sg_iov;
 325                struct iovec *iov;
 326                int i;
 327
 328                sg_iov = kmalloc(size, GFP_KERNEL);
 329                if (!sg_iov) {
 330                        ret = -ENOMEM;
 331                        goto out;
 332                }
 333
 334                if (copy_from_user(sg_iov, hdr->dxferp, size)) {
 335                        kfree(sg_iov);
 336                        ret = -EFAULT;
 337                        goto out;
 338                }
 339
 340                /*
 341                 * Sum up the vecs, making sure they don't overflow
 342                 */
 343                iov = (struct iovec *) sg_iov;
 344                iov_data_len = 0;
 345                for (i = 0; i < hdr->iovec_count; i++) {
 346                        if (iov_data_len + iov[i].iov_len < iov_data_len) {
 347                                kfree(sg_iov);
 348                                ret = -EINVAL;
 349                                goto out;
 350                        }
 351                        iov_data_len += iov[i].iov_len;
 352                }
 353
 354                /* SG_IO howto says that the shorter of the two wins */
 355                if (hdr->dxfer_len < iov_data_len) {
 356                        hdr->iovec_count = iov_shorten(iov,
 357                                                       hdr->iovec_count,
 358                                                       hdr->dxfer_len);
 359                        iov_data_len = hdr->dxfer_len;
 360                }
 361
 362                ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
 363                                          iov_data_len, GFP_KERNEL);
 364                kfree(sg_iov);
 365        } else if (hdr->dxfer_len)
 366                ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 367                                      GFP_KERNEL);
 368
 369        if (ret)
 370                goto out;
 371
 372        bio = rq->bio;
 373        memset(sense, 0, sizeof(sense));
 374        rq->sense = sense;
 375        rq->sense_len = 0;
 376        rq->retries = 0;
 377
 378        start_time = jiffies;
 379
 380        /* ignore return value. All information is passed back to caller
 381         * (if he doesn't check that is his problem).
 382         * N.B. a non-zero SCSI status is _not_ necessarily an error.
 383         */
 384        blk_execute_rq(q, bd_disk, rq, 0);
 385
 386        hdr->duration = jiffies_to_msecs(jiffies - start_time);
 387
 388        return blk_complete_sghdr_rq(rq, hdr, bio);
 389out:
 390        blk_put_request(rq);
 391        return ret;
 392}
 393
 394/**
 395 * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 396 * @file:       file this ioctl operates on (optional)
 397 * @q:          request queue to send scsi commands down
 398 * @disk:       gendisk to operate on (option)
 399 * @sic:        userspace structure describing the command to perform
 400 *
 401 * Send down the scsi command described by @sic to the device below
 402 * the request queue @q.  If @file is non-NULL it's used to perform
 403 * fine-grained permission checks that allow users to send down
 404 * non-destructive SCSI commands.  If the caller has a struct gendisk
 405 * available it should be passed in as @disk to allow the low level
 406 * driver to use the information contained in it.  A non-NULL @disk
 407 * is only allowed if the caller knows that the low level driver doesn't
 408 * need it (e.g. in the scsi subsystem).
 409 *
 410 * Notes:
 411 *   -  This interface is deprecated - users should use the SG_IO
 412 *      interface instead, as this is a more flexible approach to
 413 *      performing SCSI commands on a device.
 414 *   -  The SCSI command length is determined by examining the 1st byte
 415 *      of the given command. There is no way to override this.
 416 *   -  Data transfers are limited to PAGE_SIZE
 417 *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 418 *      accommodate the sense buffer when an error occurs.
 419 *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 420 *      old code will not be surprised.
 421 *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 422 *      a negative return and the Unix error code in 'errno'.
 423 *      If the SCSI command succeeds then 0 is returned.
 424 *      Positive numbers returned are the compacted SCSI error codes (4
 425 *      bytes in one int) where the lowest byte is the SCSI status.
 426 */
 427#define OMAX_SB_LEN 16          /* For backward compatibility */
 428int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 429                struct scsi_ioctl_command __user *sic)
 430{
 431        struct request *rq;
 432        int err;
 433        unsigned int in_len, out_len, bytes, opcode, cmdlen;
 434        char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 435
 436        if (!sic)
 437                return -EINVAL;
 438
 439        /*
 440         * get in an out lengths, verify they don't exceed a page worth of data
 441         */
 442        if (get_user(in_len, &sic->inlen))
 443                return -EFAULT;
 444        if (get_user(out_len, &sic->outlen))
 445                return -EFAULT;
 446        if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 447                return -EINVAL;
 448        if (get_user(opcode, sic->data))
 449                return -EFAULT;
 450
 451        bytes = max(in_len, out_len);
 452        if (bytes) {
 453                buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 454                if (!buffer)
 455                        return -ENOMEM;
 456
 457        }
 458
 459        rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 460
 461        cmdlen = COMMAND_SIZE(opcode);
 462
 463        /*
 464         * get command and data to send to device, if any
 465         */
 466        err = -EFAULT;
 467        rq->cmd_len = cmdlen;
 468        if (copy_from_user(rq->cmd, sic->data, cmdlen))
 469                goto error;
 470
 471        if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 472                goto error;
 473
 474        err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 475        if (err)
 476                goto error;
 477
 478        /* default.  possible overriden later */
 479        rq->retries = 5;
 480
 481        switch (opcode) {
 482        case SEND_DIAGNOSTIC:
 483        case FORMAT_UNIT:
 484                rq->timeout = FORMAT_UNIT_TIMEOUT;
 485                rq->retries = 1;
 486                break;
 487        case START_STOP:
 488                rq->timeout = START_STOP_TIMEOUT;
 489                break;
 490        case MOVE_MEDIUM:
 491                rq->timeout = MOVE_MEDIUM_TIMEOUT;
 492                break;
 493        case READ_ELEMENT_STATUS:
 494                rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 495                break;
 496        case READ_DEFECT_DATA:
 497                rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 498                rq->retries = 1;
 499                break;
 500        default:
 501                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 502                break;
 503        }
 504
 505        if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 506                err = DRIVER_ERROR << 24;
 507                goto out;
 508        }
 509
 510        memset(sense, 0, sizeof(sense));
 511        rq->sense = sense;
 512        rq->sense_len = 0;
 513        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 514
 515        blk_execute_rq(q, disk, rq, 0);
 516
 517out:
 518        err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 519        if (err) {
 520                if (rq->sense_len && rq->sense) {
 521                        bytes = (OMAX_SB_LEN > rq->sense_len) ?
 522                                rq->sense_len : OMAX_SB_LEN;
 523                        if (copy_to_user(sic->data, rq->sense, bytes))
 524                                err = -EFAULT;
 525                }
 526        } else {
 527                if (copy_to_user(sic->data, buffer, out_len))
 528                        err = -EFAULT;
 529        }
 530        
 531error:
 532        kfree(buffer);
 533        blk_put_request(rq);
 534        return err;
 535}
 536EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 537
 538/* Send basic block requests */
 539static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 540                              int cmd, int data)
 541{
 542        struct request *rq;
 543        int err;
 544
 545        rq = blk_get_request(q, WRITE, __GFP_WAIT);
 546        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 547        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 548        rq->cmd[0] = cmd;
 549        rq->cmd[4] = data;
 550        rq->cmd_len = 6;
 551        err = blk_execute_rq(q, bd_disk, rq, 0);
 552        blk_put_request(rq);
 553
 554        return err;
 555}
 556
 557static inline int blk_send_start_stop(struct request_queue *q,
 558                                      struct gendisk *bd_disk, int data)
 559{
 560        return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 561}
 562
 563int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 564                   unsigned int cmd, void __user *arg)
 565{
 566        int err;
 567
 568        if (!q || blk_get_queue(q))
 569                return -ENXIO;
 570
 571        switch (cmd) {
 572                /*
 573                 * new sgv3 interface
 574                 */
 575                case SG_GET_VERSION_NUM:
 576                        err = sg_get_version(arg);
 577                        break;
 578                case SCSI_IOCTL_GET_IDLUN:
 579                        err = scsi_get_idlun(q, arg);
 580                        break;
 581                case SCSI_IOCTL_GET_BUS_NUMBER:
 582                        err = scsi_get_bus(q, arg);
 583                        break;
 584                case SG_SET_TIMEOUT:
 585                        err = sg_set_timeout(q, arg);
 586                        break;
 587                case SG_GET_TIMEOUT:
 588                        err = sg_get_timeout(q);
 589                        break;
 590                case SG_GET_RESERVED_SIZE:
 591                        err = sg_get_reserved_size(q, arg);
 592                        break;
 593                case SG_SET_RESERVED_SIZE:
 594                        err = sg_set_reserved_size(q, arg);
 595                        break;
 596                case SG_EMULATED_HOST:
 597                        err = sg_emulated_host(q, arg);
 598                        break;
 599                case SG_IO: {
 600                        struct sg_io_hdr hdr;
 601
 602                        err = -EFAULT;
 603                        if (copy_from_user(&hdr, arg, sizeof(hdr)))
 604                                break;
 605                        err = sg_io(q, bd_disk, &hdr, mode);
 606                        if (err == -EFAULT)
 607                                break;
 608
 609                        if (copy_to_user(arg, &hdr, sizeof(hdr)))
 610                                err = -EFAULT;
 611                        break;
 612                }
 613                case CDROM_SEND_PACKET: {
 614                        struct cdrom_generic_command cgc;
 615                        struct sg_io_hdr hdr;
 616
 617                        err = -EFAULT;
 618                        if (copy_from_user(&cgc, arg, sizeof(cgc)))
 619                                break;
 620                        cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 621                        memset(&hdr, 0, sizeof(hdr));
 622                        hdr.interface_id = 'S';
 623                        hdr.cmd_len = sizeof(cgc.cmd);
 624                        hdr.dxfer_len = cgc.buflen;
 625                        err = 0;
 626                        switch (cgc.data_direction) {
 627                                case CGC_DATA_UNKNOWN:
 628                                        hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 629                                        break;
 630                                case CGC_DATA_WRITE:
 631                                        hdr.dxfer_direction = SG_DXFER_TO_DEV;
 632                                        break;
 633                                case CGC_DATA_READ:
 634                                        hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 635                                        break;
 636                                case CGC_DATA_NONE:
 637                                        hdr.dxfer_direction = SG_DXFER_NONE;
 638                                        break;
 639                                default:
 640                                        err = -EINVAL;
 641                        }
 642                        if (err)
 643                                break;
 644
 645                        hdr.dxferp = cgc.buffer;
 646                        hdr.sbp = cgc.sense;
 647                        if (hdr.sbp)
 648                                hdr.mx_sb_len = sizeof(struct request_sense);
 649                        hdr.timeout = jiffies_to_msecs(cgc.timeout);
 650                        hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 651                        hdr.cmd_len = sizeof(cgc.cmd);
 652
 653                        err = sg_io(q, bd_disk, &hdr, mode);
 654                        if (err == -EFAULT)
 655                                break;
 656
 657                        if (hdr.status)
 658                                err = -EIO;
 659
 660                        cgc.stat = err;
 661                        cgc.buflen = hdr.resid;
 662                        if (copy_to_user(arg, &cgc, sizeof(cgc)))
 663                                err = -EFAULT;
 664
 665                        break;
 666                }
 667
 668                /*
 669                 * old junk scsi send command ioctl
 670                 */
 671                case SCSI_IOCTL_SEND_COMMAND:
 672                        printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 673                        err = -EINVAL;
 674                        if (!arg)
 675                                break;
 676
 677                        err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 678                        break;
 679                case CDROMCLOSETRAY:
 680                        err = blk_send_start_stop(q, bd_disk, 0x03);
 681                        break;
 682                case CDROMEJECT:
 683                        err = blk_send_start_stop(q, bd_disk, 0x02);
 684                        break;
 685                default:
 686                        err = -ENOTTY;
 687        }
 688
 689        blk_put_queue(q);
 690        return err;
 691}
 692EXPORT_SYMBOL(scsi_cmd_ioctl);
 693
 694static int __init blk_scsi_ioctl_init(void)
 695{
 696        blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 697        return 0;
 698}
 699fs_initcall(blk_scsi_ioctl_init);
 700