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