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} 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