block/scsi_ioctl.c

   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[8] =
  37 {
  38         6, 10, 10, 12,
  39         16, 12, 10, 10
  40 };
  41
  42 EXPORT_SYMBOL(scsi_command_size);
  43
  44 #include <scsi/sg.h>
  45
  46 static int sg_get_version(int __user *p)
  47 {
  48         static const int sg_version_num = 30527;
  49         return put_user(sg_version_num, p);
  50 }
  51
  52 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  53 {
  54         return put_user(0, p);
  55 }
  56
  57 static int scsi_get_bus(struct request_queue *q, int __user *p)
  58 {
  59         return put_user(0, p);
  60 }
  61
  62 static int sg_get_timeout(struct request_queue *q)
  63 {
  64         return q->sg_timeout / (HZ / USER_HZ);
  65 }
  66
  67 static int sg_set_timeout(struct request_queue *q, int __user *p)
  68 {
  69         int timeout, err = get_user(timeout, p);
  70
  71         if (!err)
  72                 q->sg_timeout = timeout * (HZ / USER_HZ);
  73
  74         return err;
  75 }
  76
  77 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  78 {
  79         unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
  80
  81         return put_user(val, p);
  82 }
  83
  84 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
  85 {
  86         int size, err = get_user(size, p);
  87
  88         if (err)
  89                 return err;
  90
  91         if (size < 0)
  92                 return -EINVAL;
  93         if (size > (q->max_sectors << 9))
  94                 size = q->max_sectors << 9;
  95
  96         q->sg_reserved_size = size;
  97         return 0;
  98 }
  99
 100 /*
 101  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 102  * so sure this is worth doing anything about (why would you care??)
 103  */
 104 static int sg_emulated_host(struct request_queue *q, int __user *p)
 105 {
 106         return put_user(1, p);
 107 }
 108
 109 #define CMD_READ_SAFE   0x01
 110 #define CMD_WRITE_SAFE  0x02
 111 #define CMD_WARNED      0x04
 112 #define safe_for_read(cmd)      [cmd] = CMD_READ_SAFE
 113 #define safe_for_write(cmd)     [cmd] = CMD_WRITE_SAFE
 114
 115 int blk_verify_command(unsigned char *cmd, int has_write_perm)
 116 {
 117         static unsigned char cmd_type[256] = {
 118
 119                 /* Basic read-only commands */
 120                 safe_for_read(TEST_UNIT_READY),
 121                 safe_for_read(REQUEST_SENSE),
 122                 safe_for_read(READ_6),
 123                 safe_for_read(READ_10),
 124                 safe_for_read(READ_12),
 125                 safe_for_read(READ_16),
 126                 safe_for_read(READ_BUFFER),
 127                 safe_for_read(READ_DEFECT_DATA),
 128                 safe_for_read(READ_LONG),
 129                 safe_for_read(INQUIRY),
 130                 safe_for_read(MODE_SENSE),
 131                 safe_for_read(MODE_SENSE_10),
 132                 safe_for_read(LOG_SENSE),
 133                 safe_for_read(START_STOP),
 134                 safe_for_read(GPCMD_VERIFY_10),
 135                 safe_for_read(VERIFY_16),
 136
 137                 /* Audio CD commands */
 138                 safe_for_read(GPCMD_PLAY_CD),
 139                 safe_for_read(GPCMD_PLAY_AUDIO_10),
 140                 safe_for_read(GPCMD_PLAY_AUDIO_MSF),
 141                 safe_for_read(GPCMD_PLAY_AUDIO_TI),
 142                 safe_for_read(GPCMD_PAUSE_RESUME),
 143
 144                 /* CD/DVD data reading */
 145                 safe_for_read(GPCMD_READ_BUFFER_CAPACITY),
 146                 safe_for_read(GPCMD_READ_CD),
 147                 safe_for_read(GPCMD_READ_CD_MSF),
 148                 safe_for_read(GPCMD_READ_DISC_INFO),
 149                 safe_for_read(GPCMD_READ_CDVD_CAPACITY),
 150                 safe_for_read(GPCMD_READ_DVD_STRUCTURE),
 151                 safe_for_read(GPCMD_READ_HEADER),
 152                 safe_for_read(GPCMD_READ_TRACK_RZONE_INFO),
 153                 safe_for_read(GPCMD_READ_SUBCHANNEL),
 154                 safe_for_read(GPCMD_READ_TOC_PMA_ATIP),
 155                 safe_for_read(GPCMD_REPORT_KEY),
 156                 safe_for_read(GPCMD_SCAN),
 157                 safe_for_read(GPCMD_GET_CONFIGURATION),
 158                 safe_for_read(GPCMD_READ_FORMAT_CAPACITIES),
 159                 safe_for_read(GPCMD_GET_EVENT_STATUS_NOTIFICATION),
 160                 safe_for_read(GPCMD_GET_PERFORMANCE),
 161                 safe_for_read(GPCMD_SEEK),
 162                 safe_for_read(GPCMD_STOP_PLAY_SCAN),
 163
 164                 /* Basic writing commands */
 165                 safe_for_write(WRITE_6),
 166                 safe_for_write(WRITE_10),
 167                 safe_for_write(WRITE_VERIFY),
 168                 safe_for_write(WRITE_12),
 169                 safe_for_write(WRITE_VERIFY_12),
 170                 safe_for_write(WRITE_16),
 171                 safe_for_write(WRITE_LONG),
 172                 safe_for_write(WRITE_LONG_2),
 173                 safe_for_write(ERASE),
 174                 safe_for_write(GPCMD_MODE_SELECT_10),
 175                 safe_for_write(MODE_SELECT),
 176                 safe_for_write(LOG_SELECT),
 177                 safe_for_write(GPCMD_BLANK),
 178                 safe_for_write(GPCMD_CLOSE_TRACK),
 179                 safe_for_write(GPCMD_FLUSH_CACHE),
 180                 safe_for_write(GPCMD_FORMAT_UNIT),
 181                 safe_for_write(GPCMD_REPAIR_RZONE_TRACK),
 182                 safe_for_write(GPCMD_RESERVE_RZONE_TRACK),
 183                 safe_for_write(GPCMD_SEND_DVD_STRUCTURE),
 184                 safe_for_write(GPCMD_SEND_EVENT),
 185                 safe_for_write(GPCMD_SEND_KEY),
 186                 safe_for_write(GPCMD_SEND_OPC),
 187                 safe_for_write(GPCMD_SEND_CUE_SHEET),
 188                 safe_for_write(GPCMD_SET_SPEED),
 189                 safe_for_write(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL),
 190                 safe_for_write(GPCMD_LOAD_UNLOAD),
 191                 safe_for_write(GPCMD_SET_STREAMING),
 192         };
 193         unsigned char type = cmd_type[cmd[0]];
 194
 195         /* Anybody who can open the device can do a read-safe command */
 196         if (type & CMD_READ_SAFE)
 197                 return 0;
 198
 199         /* Write-safe commands just require a writable open.. */
 200         if ((type & CMD_WRITE_SAFE) && has_write_perm)
 201                 return 0;
 202
 203         /* And root can do any command.. */
 204         if (capable(CAP_SYS_RAWIO))
 205                 return 0;
 206
 207         if (!type) {
 208                 cmd_type[cmd[0]] = CMD_WARNED;
 209                 printk(KERN_WARNING "scsi: unknown opcode 0x%02x\n", cmd[0]);
 210         }
 211
 212         /* Otherwise fail it with an "Operation not permitted" */
 213         return -EPERM;
 214 }
 215 EXPORT_SYMBOL_GPL(blk_verify_command);
 216
 217 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 218                              struct sg_io_hdr *hdr, int has_write_perm)
 219 {
 220         memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
 221
 222         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 223                 return -EFAULT;
 224         if (blk_verify_command(rq->cmd, has_write_perm))
 225                 return -EPERM;
 226
 227         /*
 228          * fill in request structure
 229          */
 230         rq->cmd_len = hdr->cmd_len;
 231         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 232
 233         rq->timeout = msecs_to_jiffies(hdr->timeout);
 234         if (!rq->timeout)
 235                 rq->timeout = q->sg_timeout;
 236         if (!rq->timeout)
 237                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 238
 239         return 0;
 240 }
 241
 242 /*
 243  * unmap a request that was previously mapped to this sg_io_hdr. handles
 244  * both sg and non-sg sg_io_hdr.
 245  */
 246 static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
 247 {
 248         blk_rq_unmap_user(rq->bio);
 249         blk_put_request(rq);
 250         return 0;
 251 }
 252
 253 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 254                                  struct bio *bio)
 255 {
 256         int r, ret = 0;
 257
 258         /*
 259          * fill in all the output members
 260          */
 261         hdr->status = rq->errors & 0xff;
 262         hdr->masked_status = status_byte(rq->errors);
 263         hdr->msg_status = msg_byte(rq->errors);
 264         hdr->host_status = host_byte(rq->errors);
 265         hdr->driver_status = driver_byte(rq->errors);
 266         hdr->info = 0;
 267         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 268                 hdr->info |= SG_INFO_CHECK;
 269         hdr->resid = rq->data_len;
 270         hdr->sb_len_wr = 0;
 271
 272         if (rq->sense_len && hdr->sbp) {
 273                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 274
 275                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 276                         hdr->sb_len_wr = len;
 277                 else
 278                         ret = -EFAULT;
 279         }
 280
 281         rq->bio = bio;
 282         r = blk_unmap_sghdr_rq(rq, hdr);
 283         if (ret)
 284                 r = ret;
 285
 286         return r;
 287 }
 288
 289 static int sg_io(struct file *file, struct request_queue *q,
 290                 struct gendisk *bd_disk, struct sg_io_hdr *hdr)
 291 {
 292         unsigned long start_time;
 293         int writing = 0, ret = 0, has_write_perm = 0;
 294         struct request *rq;
 295         char sense[SCSI_SENSE_BUFFERSIZE];
 296         struct bio *bio;
 297
 298         if (hdr->interface_id != 'S')
 299                 return -EINVAL;
 300         if (hdr->cmd_len > BLK_MAX_CDB)
 301                 return -EINVAL;
 302
 303         if (hdr->dxfer_len > (q->max_hw_sectors << 9))
 304                 return -EIO;
 305
 306         if (hdr->dxfer_len)
 307                 switch (hdr->dxfer_direction) {
 308                 default:
 309                         return -EINVAL;
 310                 case SG_DXFER_TO_DEV:
 311                         writing = 1;
 312                         break;
 313                 case SG_DXFER_TO_FROM_DEV:
 314                 case SG_DXFER_FROM_DEV:
 315                         break;
 316                 }
 317
 318         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 319         if (!rq)
 320                 return -ENOMEM;
 321
 322         if (file)
 323                 has_write_perm = file->f_mode & FMODE_WRITE;
 324
 325         if (blk_fill_sghdr_rq(q, rq, hdr, has_write_perm)) {
 326                 blk_put_request(rq);
 327                 return -EFAULT;
 328         }
 329
 330         if (hdr->iovec_count) {
 331                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 332                 struct sg_iovec *iov;
 333
 334                 iov = kmalloc(size, GFP_KERNEL);
 335                 if (!iov) {
 336                         ret = -ENOMEM;
 337                         goto out;
 338                 }
 339
 340                 if (copy_from_user(iov, hdr->dxferp, size)) {
 341                         kfree(iov);
 342                         ret = -EFAULT;
 343                         goto out;
 344                 }
 345
 346                 ret = blk_rq_map_user_iov(q, rq, iov, hdr->iovec_count,
 347                                           hdr->dxfer_len);
 348                 kfree(iov);
 349         } else if (hdr->dxfer_len)
 350                 ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
 351
 352         if (ret)
 353                 goto out;
 354
 355         bio = rq->bio;
 356         memset(sense, 0, sizeof(sense));
 357         rq->sense = sense;
 358         rq->sense_len = 0;
 359         rq->retries = 0;
 360
 361         start_time = jiffies;
 362
 363         /* ignore return value. All information is passed back to caller
 364          * (if he doesn't check that is his problem).
 365          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 366          */
 367         blk_execute_rq(q, bd_disk, rq, 0);
 368
 369         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 370
 371         return blk_complete_sghdr_rq(rq, hdr, bio);
 372 out:
 373         blk_put_request(rq);
 374         return ret;
 375 }
 376
 377 /**
 378  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 379  * @file:       file this ioctl operates on (optional)
 380  * @q:          request queue to send scsi commands down
 381  * @disk:       gendisk to operate on (option)
 382  * @sic:        userspace structure describing the command to perform
 383  *
 384  * Send down the scsi command described by @sic to the device below
 385  * the request queue @q.  If @file is non-NULL it's used to perform
 386  * fine-grained permission checks that allow users to send down
 387  * non-destructive SCSI commands.  If the caller has a struct gendisk
 388  * available it should be passed in as @disk to allow the low level
 389  * driver to use the information contained in it.  A non-NULL @disk
 390  * is only allowed if the caller knows that the low level driver doesn't
 391  * need it (e.g. in the scsi subsystem).
 392  *
 393  * Notes:
 394  *   -  This interface is deprecated - users should use the SG_IO
 395  *      interface instead, as this is a more flexible approach to
 396  *      performing SCSI commands on a device.
 397  *   -  The SCSI command length is determined by examining the 1st byte
 398  *      of the given command. There is no way to override this.
 399  *   -  Data transfers are limited to PAGE_SIZE
 400  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 401  *      accommodate the sense buffer when an error occurs.
 402  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 403  *      old code will not be surprised.
 404  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 405  *      a negative return and the Unix error code in 'errno'.
 406  *      If the SCSI command succeeds then 0 is returned.
 407  *      Positive numbers returned are the compacted SCSI error codes (4
 408  *      bytes in one int) where the lowest byte is the SCSI status.
 409  */
 410 #define OMAX_SB_LEN 16          /* For backward compatibility */
 411 int sg_scsi_ioctl(struct file *file, struct request_queue *q,
 412                   struct gendisk *disk, struct scsi_ioctl_command __user *sic)
 413 {
 414         struct request *rq;
 415         int err;
 416         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 417         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 418
 419         if (!sic)
 420                 return -EINVAL;
 421
 422         /*
 423          * get in an out lengths, verify they don't exceed a page worth of data
 424          */
 425         if (get_user(in_len, &sic->inlen))
 426                 return -EFAULT;
 427         if (get_user(out_len, &sic->outlen))
 428                 return -EFAULT;
 429         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 430                 return -EINVAL;
 431         if (get_user(opcode, sic->data))
 432                 return -EFAULT;
 433
 434         bytes = max(in_len, out_len);
 435         if (bytes) {
 436                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 437                 if (!buffer)
 438                         return -ENOMEM;
 439
 440         }
 441
 442         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 443
 444         cmdlen = COMMAND_SIZE(opcode);
 445
 446         /*
 447          * get command and data to send to device, if any
 448          */
 449         err = -EFAULT;
 450         rq->cmd_len = cmdlen;
 451         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 452                 goto error;
 453
 454         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 455                 goto error;
 456
 457         err = blk_verify_command(rq->cmd, file->f_mode & FMODE_WRITE);
 458         if (err)
 459                 goto error;
 460
 461         /* default.  possible overriden later */
 462         rq->retries = 5;
 463
 464         switch (opcode) {
 465         case SEND_DIAGNOSTIC:
 466         case FORMAT_UNIT:
 467                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 468                 rq->retries = 1;
 469                 break;
 470         case START_STOP:
 471                 rq->timeout = START_STOP_TIMEOUT;
 472                 break;
 473         case MOVE_MEDIUM:
 474                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 475                 break;
 476         case READ_ELEMENT_STATUS:
 477                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 478                 break;
 479         case READ_DEFECT_DATA:
 480                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 481                 rq->retries = 1;
 482                 break;
 483         default:
 484                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 485                 break;
 486         }
 487
 488         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 489                 err = DRIVER_ERROR << 24;
 490                 goto out;
 491         }
 492
 493         memset(sense, 0, sizeof(sense));
 494         rq->sense = sense;
 495         rq->sense_len = 0;
 496         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 497
 498         blk_execute_rq(q, disk, rq, 0);
 499
 500 out:
 501         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 502         if (err) {
 503                 if (rq->sense_len && rq->sense) {
 504                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 505                                 rq->sense_len : OMAX_SB_LEN;
 506                         if (copy_to_user(sic->data, rq->sense, bytes))
 507                                 err = -EFAULT;
 508                 }
 509         } else {
 510                 if (copy_to_user(sic->data, buffer, out_len))
 511                         err = -EFAULT;
 512         }
 513
 514 error:
 515         kfree(buffer);
 516         blk_put_request(rq);
 517         return err;
 518 }
 519 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 520
 521 /* Send basic block requests */
 522 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 523                               int cmd, int data)
 524 {
 525         struct request *rq;
 526         int err;
 527
 528         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 529         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 530         rq->data = NULL;
 531         rq->data_len = 0;
 532         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 533         memset(rq->cmd, 0, sizeof(rq->cmd));
 534         rq->cmd[0] = cmd;
 535         rq->cmd[4] = data;
 536         rq->cmd_len = 6;
 537         err = blk_execute_rq(q, bd_disk, rq, 0);
 538         blk_put_request(rq);
 539
 540         return err;
 541 }
 542
 543 static inline int blk_send_start_stop(struct request_queue *q,
 544                                       struct gendisk *bd_disk, int data)
 545 {
 546         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 547 }
 548
 549 int scsi_cmd_ioctl(struct file *file, struct request_queue *q,
 550                    struct gendisk *bd_disk, unsigned int cmd, void __user *arg)
 551 {
 552         int err;
 553
 554         if (!q || blk_get_queue(q))
 555                 return -ENXIO;
 556
 557         switch (cmd) {
 558                 /*
 559                  * new sgv3 interface
 560                  */
 561                 case SG_GET_VERSION_NUM:
 562                         err = sg_get_version(arg);
 563                         break;
 564                 case SCSI_IOCTL_GET_IDLUN:
 565                         err = scsi_get_idlun(q, arg);
 566                         break;
 567                 case SCSI_IOCTL_GET_BUS_NUMBER:
 568                         err = scsi_get_bus(q, arg);
 569                         break;
 570                 case SG_SET_TIMEOUT:
 571                         err = sg_set_timeout(q, arg);
 572                         break;
 573                 case SG_GET_TIMEOUT:
 574                         err = sg_get_timeout(q);
 575                         break;
 576                 case SG_GET_RESERVED_SIZE:
 577                         err = sg_get_reserved_size(q, arg);
 578                         break;
 579                 case SG_SET_RESERVED_SIZE:
 580                         err = sg_set_reserved_size(q, arg);
 581                         break;
 582                 case SG_EMULATED_HOST:
 583                         err = sg_emulated_host(q, arg);
 584                         break;
 585                 case SG_IO: {
 586                         struct sg_io_hdr hdr;
 587
 588                         err = -EFAULT;
 589                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 590                                 break;
 591                         err = sg_io(file, q, bd_disk, &hdr);
 592                         if (err == -EFAULT)
 593                                 break;
 594
 595                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 596                                 err = -EFAULT;
 597                         break;
 598                 }
 599                 case CDROM_SEND_PACKET: {
 600                         struct cdrom_generic_command cgc;
 601                         struct sg_io_hdr hdr;
 602
 603                         err = -EFAULT;
 604                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 605                                 break;
 606                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 607                         memset(&hdr, 0, sizeof(hdr));
 608                         hdr.interface_id = 'S';
 609                         hdr.cmd_len = sizeof(cgc.cmd);
 610                         hdr.dxfer_len = cgc.buflen;
 611                         err = 0;
 612                         switch (cgc.data_direction) {
 613                                 case CGC_DATA_UNKNOWN:
 614                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 615                                         break;
 616                                 case CGC_DATA_WRITE:
 617                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 618                                         break;
 619                                 case CGC_DATA_READ:
 620                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 621                                         break;
 622                                 case CGC_DATA_NONE:
 623                                         hdr.dxfer_direction = SG_DXFER_NONE;
 624                                         break;
 625                                 default:
 626                                         err = -EINVAL;
 627                         }
 628                         if (err)
 629                                 break;
 630
 631                         hdr.dxferp = cgc.buffer;
 632                         hdr.sbp = cgc.sense;
 633                         if (hdr.sbp)
 634                                 hdr.mx_sb_len = sizeof(struct request_sense);
 635                         hdr.timeout = cgc.timeout;
 636                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 637                         hdr.cmd_len = sizeof(cgc.cmd);
 638
 639                         err = sg_io(file, q, bd_disk, &hdr);
 640                         if (err == -EFAULT)
 641                                 break;
 642
 643                         if (hdr.status)
 644                                 err = -EIO;
 645
 646                         cgc.stat = err;
 647                         cgc.buflen = hdr.resid;
 648                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 649                                 err = -EFAULT;
 650
 651                         break;
 652                 }
 653
 654                 /*
 655                  * old junk scsi send command ioctl
 656                  */
 657                 case SCSI_IOCTL_SEND_COMMAND:
 658                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 659                         err = -EINVAL;
 660                         if (!arg)
 661                                 break;
 662
 663                         err = sg_scsi_ioctl(file, q, bd_disk, arg);
 664                         break;
 665                 case CDROMCLOSETRAY:
 666                         err = blk_send_start_stop(q, bd_disk, 0x03);
 667                         break;
 668                 case CDROMEJECT:
 669                         err = blk_send_start_stop(q, bd_disk, 0x02);
 670                         break;
 671                 default:
 672                         err = -ENOTTY;
 673         }
 674
 675         blk_put_queue(q);
 676         return err;
 677 }
 678
 679 EXPORT_SYMBOL(scsi_cmd_ioctl);