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