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   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.  */
  36 const unsigned char scsi_command_size_tbl[8] =
  37 {
  38         6, 10, 10, 12,
  39         16, 12, 10, 10
  40 };
  41 EXPORT_SYMBOL(scsi_command_size_tbl);
  42
  43 #include <scsi/sg.h>
  44
  45 static 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
  51 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  52 {
  53         return put_user(0, p);
  54 }
  55
  56 static int scsi_get_bus(struct request_queue *q, int __user *p)
  57 {
  58         return put_user(0, p);
  59 }
  60
  61 static int sg_get_timeout(struct request_queue *q)
  62 {
  63         return q->sg_timeout / (HZ / USER_HZ);
  64 }
  65
  66 static 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
  76 static 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
  83 static 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  */
 103 static int sg_emulated_host(struct request_queue *q, int __user *p)
 104 {
 105         return put_user(1, p);
 106 }
 107
 108 void 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 }
 190 EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults);
 191
 192 static 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
 212         return 0;
 213 }
 214
 215 /*
 216  * unmap a request that was previously mapped to this sg_io_hdr. handles
 217  * both sg and non-sg sg_io_hdr.
 218  */
 219 static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
 220 {
 221         blk_rq_unmap_user(rq->bio);
 222         blk_put_request(rq);
 223         return 0;
 224 }
 225
 226 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 227                                  struct bio *bio)
 228 {
 229         int r, ret = 0;
 230
 231         /*
 232          * fill in all the output members
 233          */
 234         hdr->status = rq->errors & 0xff;
 235         hdr->masked_status = status_byte(rq->errors);
 236         hdr->msg_status = msg_byte(rq->errors);
 237         hdr->host_status = host_byte(rq->errors);
 238         hdr->driver_status = driver_byte(rq->errors);
 239         hdr->info = 0;
 240         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 241                 hdr->info |= SG_INFO_CHECK;
 242         hdr->resid = rq->data_len;
 243         hdr->sb_len_wr = 0;
 244
 245         if (rq->sense_len && hdr->sbp) {
 246                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 247
 248                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 249                         hdr->sb_len_wr = len;
 250                 else
 251                         ret = -EFAULT;
 252         }
 253
 254         rq->bio = bio;
 255         r = blk_unmap_sghdr_rq(rq, hdr);
 256         if (ret)
 257                 r = ret;
 258
 259         return r;
 260 }
 261
 262 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 263                 struct sg_io_hdr *hdr, fmode_t mode)
 264 {
 265         unsigned long start_time;
 266         int writing = 0, ret = 0;
 267         struct request *rq;
 268         char sense[SCSI_SENSE_BUFFERSIZE];
 269         struct bio *bio;
 270
 271         if (hdr->interface_id != 'S')
 272                 return -EINVAL;
 273         if (hdr->cmd_len > BLK_MAX_CDB)
 274                 return -EINVAL;
 275
 276         if (hdr->dxfer_len > (q->max_hw_sectors << 9))
 277                 return -EIO;
 278
 279         if (hdr->dxfer_len)
 280                 switch (hdr->dxfer_direction) {
 281                 default:
 282                         return -EINVAL;
 283                 case SG_DXFER_TO_DEV:
 284                         writing = 1;
 285                         break;
 286                 case SG_DXFER_TO_FROM_DEV:
 287                 case SG_DXFER_FROM_DEV:
 288                         break;
 289                 }
 290
 291         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 292         if (!rq)
 293                 return -ENOMEM;
 294
 295         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 296                 blk_put_request(rq);
 297                 return -EFAULT;
 298         }
 299
 300         if (hdr->iovec_count) {
 301                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 302                 struct sg_iovec *iov;
 303
 304                 iov = kmalloc(size, GFP_KERNEL);
 305                 if (!iov) {
 306                         ret = -ENOMEM;
 307                         goto out;
 308                 }
 309
 310                 if (copy_from_user(iov, hdr->dxferp, size)) {
 311                         kfree(iov);
 312                         ret = -EFAULT;
 313                         goto out;
 314                 }
 315
 316                 ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
 317                                           hdr->dxfer_len, GFP_KERNEL);
 318                 kfree(iov);
 319         } else if (hdr->dxfer_len)
 320                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 321                                       GFP_KERNEL);
 322
 323         if (ret)
 324                 goto out;
 325
 326         bio = rq->bio;
 327         memset(sense, 0, sizeof(sense));
 328         rq->sense = sense;
 329         rq->sense_len = 0;
 330         rq->retries = 0;
 331
 332         start_time = jiffies;
 333
 334         /* ignore return value. All information is passed back to caller
 335          * (if he doesn't check that is his problem).
 336          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 337          */
 338         blk_execute_rq(q, bd_disk, rq, 0);
 339
 340         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 341
 342         return blk_complete_sghdr_rq(rq, hdr, bio);
 343 out:
 344         blk_put_request(rq);
 345         return ret;
 346 }
 347
 348 /**
 349  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 350  * @file:       file this ioctl operates on (optional)
 351  * @q:          request queue to send scsi commands down
 352  * @disk:       gendisk to operate on (option)
 353  * @sic:        userspace structure describing the command to perform
 354  *
 355  * Send down the scsi command described by @sic to the device below
 356  * the request queue @q.  If @file is non-NULL it's used to perform
 357  * fine-grained permission checks that allow users to send down
 358  * non-destructive SCSI commands.  If the caller has a struct gendisk
 359  * available it should be passed in as @disk to allow the low level
 360  * driver to use the information contained in it.  A non-NULL @disk
 361  * is only allowed if the caller knows that the low level driver doesn't
 362  * need it (e.g. in the scsi subsystem).
 363  *
 364  * Notes:
 365  *   -  This interface is deprecated - users should use the SG_IO
 366  *      interface instead, as this is a more flexible approach to
 367  *      performing SCSI commands on a device.
 368  *   -  The SCSI command length is determined by examining the 1st byte
 369  *      of the given command. There is no way to override this.
 370  *   -  Data transfers are limited to PAGE_SIZE
 371  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 372  *      accommodate the sense buffer when an error occurs.
 373  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 374  *      old code will not be surprised.
 375  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 376  *      a negative return and the Unix error code in 'errno'.
 377  *      If the SCSI command succeeds then 0 is returned.
 378  *      Positive numbers returned are the compacted SCSI error codes (4
 379  *      bytes in one int) where the lowest byte is the SCSI status.
 380  */
 381 #define OMAX_SB_LEN 16          /* For backward compatibility */
 382 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 383                 struct scsi_ioctl_command __user *sic)
 384 {
 385         struct request *rq;
 386         int err;
 387         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 388         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 389
 390         if (!sic)
 391                 return -EINVAL;
 392
 393         /*
 394          * get in an out lengths, verify they don't exceed a page worth of data
 395          */
 396         if (get_user(in_len, &sic->inlen))
 397                 return -EFAULT;
 398         if (get_user(out_len, &sic->outlen))
 399                 return -EFAULT;
 400         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 401                 return -EINVAL;
 402         if (get_user(opcode, sic->data))
 403                 return -EFAULT;
 404
 405         bytes = max(in_len, out_len);
 406         if (bytes) {
 407                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 408                 if (!buffer)
 409                         return -ENOMEM;
 410
 411         }
 412
 413         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 414
 415         cmdlen = COMMAND_SIZE(opcode);
 416
 417         /*
 418          * get command and data to send to device, if any
 419          */
 420         err = -EFAULT;
 421         rq->cmd_len = cmdlen;
 422         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 423                 goto error;
 424
 425         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 426                 goto error;
 427
 428         err = blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE);
 429         if (err)
 430                 goto error;
 431
 432         /* default.  possible overriden later */
 433         rq->retries = 5;
 434
 435         switch (opcode) {
 436         case SEND_DIAGNOSTIC:
 437         case FORMAT_UNIT:
 438                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 439                 rq->retries = 1;
 440                 break;
 441         case START_STOP:
 442                 rq->timeout = START_STOP_TIMEOUT;
 443                 break;
 444         case MOVE_MEDIUM:
 445                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 446                 break;
 447         case READ_ELEMENT_STATUS:
 448                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 449                 break;
 450         case READ_DEFECT_DATA:
 451                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 452                 rq->retries = 1;
 453                 break;
 454         default:
 455                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 456                 break;
 457         }
 458
 459         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 460                 err = DRIVER_ERROR << 24;
 461                 goto out;
 462         }
 463
 464         memset(sense, 0, sizeof(sense));
 465         rq->sense = sense;
 466         rq->sense_len = 0;
 467         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 468
 469         blk_execute_rq(q, disk, rq, 0);
 470
 471 out:
 472         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 473         if (err) {
 474                 if (rq->sense_len && rq->sense) {
 475                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 476                                 rq->sense_len : OMAX_SB_LEN;
 477                         if (copy_to_user(sic->data, rq->sense, bytes))
 478                                 err = -EFAULT;
 479                 }
 480         } else {
 481                 if (copy_to_user(sic->data, buffer, out_len))
 482                         err = -EFAULT;
 483         }
 484
 485 error:
 486         kfree(buffer);
 487         blk_put_request(rq);
 488         return err;
 489 }
 490 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 491
 492 /* Send basic block requests */
 493 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 494                               int cmd, int data)
 495 {
 496         struct request *rq;
 497         int err;
 498
 499         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 500         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 501         rq->data = NULL;
 502         rq->data_len = 0;
 503         rq->extra_len = 0;
 504         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 505         rq->cmd[0] = cmd;
 506         rq->cmd[4] = data;
 507         rq->cmd_len = 6;
 508         err = blk_execute_rq(q, bd_disk, rq, 0);
 509         blk_put_request(rq);
 510
 511         return err;
 512 }
 513
 514 static inline int blk_send_start_stop(struct request_queue *q,
 515                                       struct gendisk *bd_disk, int data)
 516 {
 517         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 518 }
 519
 520 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 521                    unsigned int cmd, void __user *arg)
 522 {
 523         int err;
 524
 525         if (!q || blk_get_queue(q))
 526                 return -ENXIO;
 527
 528         switch (cmd) {
 529                 /*
 530                  * new sgv3 interface
 531                  */
 532                 case SG_GET_VERSION_NUM:
 533                         err = sg_get_version(arg);
 534                         break;
 535                 case SCSI_IOCTL_GET_IDLUN:
 536                         err = scsi_get_idlun(q, arg);
 537                         break;
 538                 case SCSI_IOCTL_GET_BUS_NUMBER:
 539                         err = scsi_get_bus(q, arg);
 540                         break;
 541                 case SG_SET_TIMEOUT:
 542                         err = sg_set_timeout(q, arg);
 543                         break;
 544                 case SG_GET_TIMEOUT:
 545                         err = sg_get_timeout(q);
 546                         break;
 547                 case SG_GET_RESERVED_SIZE:
 548                         err = sg_get_reserved_size(q, arg);
 549                         break;
 550                 case SG_SET_RESERVED_SIZE:
 551                         err = sg_set_reserved_size(q, arg);
 552                         break;
 553                 case SG_EMULATED_HOST:
 554                         err = sg_emulated_host(q, arg);
 555                         break;
 556                 case SG_IO: {
 557                         struct sg_io_hdr hdr;
 558
 559                         err = -EFAULT;
 560                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 561                                 break;
 562                         err = sg_io(q, bd_disk, &hdr, mode);
 563                         if (err == -EFAULT)
 564                                 break;
 565
 566                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 567                                 err = -EFAULT;
 568                         break;
 569                 }
 570                 case CDROM_SEND_PACKET: {
 571                         struct cdrom_generic_command cgc;
 572                         struct sg_io_hdr hdr;
 573
 574                         err = -EFAULT;
 575                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 576                                 break;
 577                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 578                         memset(&hdr, 0, sizeof(hdr));
 579                         hdr.interface_id = 'S';
 580                         hdr.cmd_len = sizeof(cgc.cmd);
 581                         hdr.dxfer_len = cgc.buflen;
 582                         err = 0;
 583                         switch (cgc.data_direction) {
 584                                 case CGC_DATA_UNKNOWN:
 585                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 586                                         break;
 587                                 case CGC_DATA_WRITE:
 588                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 589                                         break;
 590                                 case CGC_DATA_READ:
 591                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 592                                         break;
 593                                 case CGC_DATA_NONE:
 594                                         hdr.dxfer_direction = SG_DXFER_NONE;
 595                                         break;
 596                                 default:
 597                                         err = -EINVAL;
 598                         }
 599                         if (err)
 600                                 break;
 601
 602                         hdr.dxferp = cgc.buffer;
 603                         hdr.sbp = cgc.sense;
 604                         if (hdr.sbp)
 605                                 hdr.mx_sb_len = sizeof(struct request_sense);
 606                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 607                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 608                         hdr.cmd_len = sizeof(cgc.cmd);
 609
 610                         err = sg_io(q, bd_disk, &hdr, mode);
 611                         if (err == -EFAULT)
 612                                 break;
 613
 614                         if (hdr.status)
 615                                 err = -EIO;
 616
 617                         cgc.stat = err;
 618                         cgc.buflen = hdr.resid;
 619                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 620                                 err = -EFAULT;
 621
 622                         break;
 623                 }
 624
 625                 /*
 626                  * old junk scsi send command ioctl
 627                  */
 628                 case SCSI_IOCTL_SEND_COMMAND:
 629                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 630                         err = -EINVAL;
 631                         if (!arg)
 632                                 break;
 633
 634                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 635                         break;
 636                 case CDROMCLOSETRAY:
 637                         err = blk_send_start_stop(q, bd_disk, 0x03);
 638                         break;
 639                 case CDROMEJECT:
 640                         err = blk_send_start_stop(q, bd_disk, 0x02);
 641                         break;
 642                 default:
 643                         err = -ENOTTY;
 644         }
 645
 646         blk_put_queue(q);
 647         return err;
 648 }
 649
 650 EXPORT_SYMBOL(scsi_cmd_ioctl);