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