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 struct blk_cmd_filter {
  36         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  37         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  38 };
  39
  40 static struct blk_cmd_filter blk_default_cmd_filter;
  41
  42 /* Command group 3 is reserved and should never be used.  */
  43 const unsigned char scsi_command_size_tbl[8] =
  44 {
  45         6, 10, 10, 12,
  46         16, 12, 10, 10
  47 };
  48 EXPORT_SYMBOL(scsi_command_size_tbl);
  49
  50 #include <scsi/sg.h>
  51
  52 static int sg_get_version(int __user *p)
  53 {
  54         static const int sg_version_num = 30527;
  55         return put_user(sg_version_num, p);
  56 }
  57
  58 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  59 {
  60         return put_user(0, p);
  61 }
  62
  63 static int scsi_get_bus(struct request_queue *q, int __user *p)
  64 {
  65         return put_user(0, p);
  66 }
  67
  68 static int sg_get_timeout(struct request_queue *q)
  69 {
  70         return jiffies_to_clock_t(q->sg_timeout);
  71 }
  72
  73 static int sg_set_timeout(struct request_queue *q, int __user *p)
  74 {
  75         int timeout, err = get_user(timeout, p);
  76
  77         if (!err)
  78                 q->sg_timeout = clock_t_to_jiffies(timeout);
  79
  80         return err;
  81 }
  82
  83 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  84 {
  85         unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
  86
  87         return put_user(val, p);
  88 }
  89
  90 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
  91 {
  92         int size, err = get_user(size, p);
  93
  94         if (err)
  95                 return err;
  96
  97         if (size < 0)
  98                 return -EINVAL;
  99         if (size > (queue_max_sectors(q) << 9))
 100                 size = queue_max_sectors(q) << 9;
 101
 102         q->sg_reserved_size = size;
 103         return 0;
 104 }
 105
 106 /*
 107  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 108  * so sure this is worth doing anything about (why would you care??)
 109  */
 110 static int sg_emulated_host(struct request_queue *q, int __user *p)
 111 {
 112         return put_user(1, p);
 113 }
 114
 115 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 116 {
 117         /* Basic read-only commands */
 118         __set_bit(TEST_UNIT_READY, filter->read_ok);
 119         __set_bit(REQUEST_SENSE, filter->read_ok);
 120         __set_bit(READ_6, filter->read_ok);
 121         __set_bit(READ_10, filter->read_ok);
 122         __set_bit(READ_12, filter->read_ok);
 123         __set_bit(READ_16, filter->read_ok);
 124         __set_bit(READ_BUFFER, filter->read_ok);
 125         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 126         __set_bit(READ_CAPACITY, filter->read_ok);
 127         __set_bit(READ_LONG, filter->read_ok);
 128         __set_bit(INQUIRY, filter->read_ok);
 129         __set_bit(MODE_SENSE, filter->read_ok);
 130         __set_bit(MODE_SENSE_10, filter->read_ok);
 131         __set_bit(LOG_SENSE, filter->read_ok);
 132         __set_bit(START_STOP, filter->read_ok);
 133         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 134         __set_bit(VERIFY_16, filter->read_ok);
 135         __set_bit(REPORT_LUNS, filter->read_ok);
 136         __set_bit(SERVICE_ACTION_IN, filter->read_ok);
 137         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 138         __set_bit(MAINTENANCE_IN, filter->read_ok);
 139         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 140
 141         /* Audio CD commands */
 142         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 143         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 144         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 145         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 146         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 147
 148         /* CD/DVD data reading */
 149         __set_bit(GPCMD_READ_CD, filter->read_ok);
 150         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 151         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 152         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 153         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 154         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 155         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 156         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 157         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 158         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 159         __set_bit(GPCMD_SCAN, filter->read_ok);
 160         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 161         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 162         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 163         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 164         __set_bit(GPCMD_SEEK, filter->read_ok);
 165         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 166
 167         /* Basic writing commands */
 168         __set_bit(WRITE_6, filter->write_ok);
 169         __set_bit(WRITE_10, filter->write_ok);
 170         __set_bit(WRITE_VERIFY, filter->write_ok);
 171         __set_bit(WRITE_12, filter->write_ok);
 172         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 173         __set_bit(WRITE_16, filter->write_ok);
 174         __set_bit(WRITE_LONG, filter->write_ok);
 175         __set_bit(WRITE_LONG_2, filter->write_ok);
 176         __set_bit(ERASE, filter->write_ok);
 177         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 178         __set_bit(MODE_SELECT, filter->write_ok);
 179         __set_bit(LOG_SELECT, filter->write_ok);
 180         __set_bit(GPCMD_BLANK, filter->write_ok);
 181         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 182         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 183         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 184         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 185         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 186         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 187         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 188         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 189         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 190         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 191         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 192         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 193         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 194         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 195         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 196 }
 197
 198 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 199 {
 200         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 201
 202         /* root can do any command. */
 203         if (capable(CAP_SYS_RAWIO))
 204                 return 0;
 205
 206         /* if there's no filter set, assume we're filtering everything out */
 207         if (!filter)
 208                 return -EPERM;
 209
 210         /* Anybody who can open the device can do a read-safe command */
 211         if (test_bit(cmd[0], filter->read_ok))
 212                 return 0;
 213
 214         /* Write-safe commands require a writable open */
 215         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 216                 return 0;
 217
 218         return -EPERM;
 219 }
 220 EXPORT_SYMBOL(blk_verify_command);
 221
 222 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 223                              struct sg_io_hdr *hdr, fmode_t mode)
 224 {
 225         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 226                 return -EFAULT;
 227         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 228                 return -EPERM;
 229
 230         /*
 231          * fill in request structure
 232          */
 233         rq->cmd_len = hdr->cmd_len;
 234         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 235
 236         rq->timeout = msecs_to_jiffies(hdr->timeout);
 237         if (!rq->timeout)
 238                 rq->timeout = q->sg_timeout;
 239         if (!rq->timeout)
 240                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 241         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 242                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 243
 244         return 0;
 245 }
 246
 247 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 248                                  struct bio *bio)
 249 {
 250         int r, ret = 0;
 251
 252         /*
 253          * fill in all the output members
 254          */
 255         hdr->status = rq->errors & 0xff;
 256         hdr->masked_status = status_byte(rq->errors);
 257         hdr->msg_status = msg_byte(rq->errors);
 258         hdr->host_status = host_byte(rq->errors);
 259         hdr->driver_status = driver_byte(rq->errors);
 260         hdr->info = 0;
 261         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 262                 hdr->info |= SG_INFO_CHECK;
 263         hdr->resid = rq->resid_len;
 264         hdr->sb_len_wr = 0;
 265
 266         if (rq->sense_len && hdr->sbp) {
 267                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 268
 269                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 270                         hdr->sb_len_wr = len;
 271                 else
 272                         ret = -EFAULT;
 273         }
 274
 275         r = blk_rq_unmap_user(bio);
 276         if (!ret)
 277                 ret = r;
 278         blk_put_request(rq);
 279
 280         return ret;
 281 }
 282
 283 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 284                 struct sg_io_hdr *hdr, fmode_t mode)
 285 {
 286         unsigned long start_time;
 287         int writing = 0, ret = 0;
 288         struct request *rq;
 289         char sense[SCSI_SENSE_BUFFERSIZE];
 290         struct bio *bio;
 291
 292         if (hdr->interface_id != 'S')
 293                 return -EINVAL;
 294         if (hdr->cmd_len > BLK_MAX_CDB)
 295                 return -EINVAL;
 296
 297         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 298                 return -EIO;
 299
 300         if (hdr->dxfer_len)
 301                 switch (hdr->dxfer_direction) {
 302                 default:
 303                         return -EINVAL;
 304                 case SG_DXFER_TO_DEV:
 305                         writing = 1;
 306                         break;
 307                 case SG_DXFER_TO_FROM_DEV:
 308                 case SG_DXFER_FROM_DEV:
 309                         break;
 310                 }
 311
 312         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 313         if (!rq)
 314                 return -ENOMEM;
 315
 316         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 317                 blk_put_request(rq);
 318                 return -EFAULT;
 319         }
 320
 321         if (hdr->iovec_count) {
 322                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 323                 size_t iov_data_len;
 324                 struct sg_iovec *sg_iov;
 325                 struct iovec *iov;
 326                 int i;
 327
 328                 sg_iov = kmalloc(size, GFP_KERNEL);
 329                 if (!sg_iov) {
 330                         ret = -ENOMEM;
 331                         goto out;
 332                 }
 333
 334                 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
 335                         kfree(sg_iov);
 336                         ret = -EFAULT;
 337                         goto out;
 338                 }
 339
 340                 /*
 341                  * Sum up the vecs, making sure they don't overflow
 342                  */
 343                 iov = (struct iovec *) sg_iov;
 344                 iov_data_len = 0;
 345                 for (i = 0; i < hdr->iovec_count; i++) {
 346                         if (iov_data_len + iov[i].iov_len < iov_data_len) {
 347                                 kfree(sg_iov);
 348                                 ret = -EINVAL;
 349                                 goto out;
 350                         }
 351                         iov_data_len += iov[i].iov_len;
 352                 }
 353
 354                 /* SG_IO howto says that the shorter of the two wins */
 355                 if (hdr->dxfer_len < iov_data_len) {
 356                         hdr->iovec_count = iov_shorten(iov,
 357                                                        hdr->iovec_count,
 358                                                        hdr->dxfer_len);
 359                         iov_data_len = hdr->dxfer_len;
 360                 }
 361
 362                 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
 363                                           iov_data_len, GFP_KERNEL);
 364                 kfree(sg_iov);
 365         } else if (hdr->dxfer_len)
 366                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 367                                       GFP_KERNEL);
 368
 369         if (ret)
 370                 goto out;
 371
 372         bio = rq->bio;
 373         memset(sense, 0, sizeof(sense));
 374         rq->sense = sense;
 375         rq->sense_len = 0;
 376         rq->retries = 0;
 377
 378         start_time = jiffies;
 379
 380         /* ignore return value. All information is passed back to caller
 381          * (if he doesn't check that is his problem).
 382          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 383          */
 384         blk_execute_rq(q, bd_disk, rq, 0);
 385
 386         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 387
 388         return blk_complete_sghdr_rq(rq, hdr, bio);
 389 out:
 390         blk_put_request(rq);
 391         return ret;
 392 }
 393
 394 /**
 395  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 396  * @file:       file this ioctl operates on (optional)
 397  * @q:          request queue to send scsi commands down
 398  * @disk:       gendisk to operate on (option)
 399  * @sic:        userspace structure describing the command to perform
 400  *
 401  * Send down the scsi command described by @sic to the device below
 402  * the request queue @q.  If @file is non-NULL it's used to perform
 403  * fine-grained permission checks that allow users to send down
 404  * non-destructive SCSI commands.  If the caller has a struct gendisk
 405  * available it should be passed in as @disk to allow the low level
 406  * driver to use the information contained in it.  A non-NULL @disk
 407  * is only allowed if the caller knows that the low level driver doesn't
 408  * need it (e.g. in the scsi subsystem).
 409  *
 410  * Notes:
 411  *   -  This interface is deprecated - users should use the SG_IO
 412  *      interface instead, as this is a more flexible approach to
 413  *      performing SCSI commands on a device.
 414  *   -  The SCSI command length is determined by examining the 1st byte
 415  *      of the given command. There is no way to override this.
 416  *   -  Data transfers are limited to PAGE_SIZE
 417  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 418  *      accommodate the sense buffer when an error occurs.
 419  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 420  *      old code will not be surprised.
 421  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 422  *      a negative return and the Unix error code in 'errno'.
 423  *      If the SCSI command succeeds then 0 is returned.
 424  *      Positive numbers returned are the compacted SCSI error codes (4
 425  *      bytes in one int) where the lowest byte is the SCSI status.
 426  */
 427 #define OMAX_SB_LEN 16          /* For backward compatibility */
 428 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 429                 struct scsi_ioctl_command __user *sic)
 430 {
 431         struct request *rq;
 432         int err;
 433         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 434         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 435
 436         if (!sic)
 437                 return -EINVAL;
 438
 439         /*
 440          * get in an out lengths, verify they don't exceed a page worth of data
 441          */
 442         if (get_user(in_len, &sic->inlen))
 443                 return -EFAULT;
 444         if (get_user(out_len, &sic->outlen))
 445                 return -EFAULT;
 446         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 447                 return -EINVAL;
 448         if (get_user(opcode, sic->data))
 449                 return -EFAULT;
 450
 451         bytes = max(in_len, out_len);
 452         if (bytes) {
 453                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 454                 if (!buffer)
 455                         return -ENOMEM;
 456
 457         }
 458
 459         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 460
 461         cmdlen = COMMAND_SIZE(opcode);
 462
 463         /*
 464          * get command and data to send to device, if any
 465          */
 466         err = -EFAULT;
 467         rq->cmd_len = cmdlen;
 468         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 469                 goto error;
 470
 471         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 472                 goto error;
 473
 474         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 475         if (err)
 476                 goto error;
 477
 478         /* default.  possible overriden later */
 479         rq->retries = 5;
 480
 481         switch (opcode) {
 482         case SEND_DIAGNOSTIC:
 483         case FORMAT_UNIT:
 484                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 485                 rq->retries = 1;
 486                 break;
 487         case START_STOP:
 488                 rq->timeout = START_STOP_TIMEOUT;
 489                 break;
 490         case MOVE_MEDIUM:
 491                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 492                 break;
 493         case READ_ELEMENT_STATUS:
 494                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 495                 break;
 496         case READ_DEFECT_DATA:
 497                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 498                 rq->retries = 1;
 499                 break;
 500         default:
 501                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 502                 break;
 503         }
 504
 505         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 506                 err = DRIVER_ERROR << 24;
 507                 goto out;
 508         }
 509
 510         memset(sense, 0, sizeof(sense));
 511         rq->sense = sense;
 512         rq->sense_len = 0;
 513         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 514
 515         blk_execute_rq(q, disk, rq, 0);
 516
 517 out:
 518         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 519         if (err) {
 520                 if (rq->sense_len && rq->sense) {
 521                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 522                                 rq->sense_len : OMAX_SB_LEN;
 523                         if (copy_to_user(sic->data, rq->sense, bytes))
 524                                 err = -EFAULT;
 525                 }
 526         } else {
 527                 if (copy_to_user(sic->data, buffer, out_len))
 528                         err = -EFAULT;
 529         }
 530
 531 error:
 532         kfree(buffer);
 533         blk_put_request(rq);
 534         return err;
 535 }
 536 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 537
 538 /* Send basic block requests */
 539 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 540                               int cmd, int data)
 541 {
 542         struct request *rq;
 543         int err;
 544
 545         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 546         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 547         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 548         rq->cmd[0] = cmd;
 549         rq->cmd[4] = data;
 550         rq->cmd_len = 6;
 551         err = blk_execute_rq(q, bd_disk, rq, 0);
 552         blk_put_request(rq);
 553
 554         return err;
 555 }
 556
 557 static inline int blk_send_start_stop(struct request_queue *q,
 558                                       struct gendisk *bd_disk, int data)
 559 {
 560         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 561 }
 562
 563 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 564                    unsigned int cmd, void __user *arg)
 565 {
 566         int err;
 567
 568         if (!q || blk_get_queue(q))
 569                 return -ENXIO;
 570
 571         switch (cmd) {
 572                 /*
 573                  * new sgv3 interface
 574                  */
 575                 case SG_GET_VERSION_NUM:
 576                         err = sg_get_version(arg);
 577                         break;
 578                 case SCSI_IOCTL_GET_IDLUN:
 579                         err = scsi_get_idlun(q, arg);
 580                         break;
 581                 case SCSI_IOCTL_GET_BUS_NUMBER:
 582                         err = scsi_get_bus(q, arg);
 583                         break;
 584                 case SG_SET_TIMEOUT:
 585                         err = sg_set_timeout(q, arg);
 586                         break;
 587                 case SG_GET_TIMEOUT:
 588                         err = sg_get_timeout(q);
 589                         break;
 590                 case SG_GET_RESERVED_SIZE:
 591                         err = sg_get_reserved_size(q, arg);
 592                         break;
 593                 case SG_SET_RESERVED_SIZE:
 594                         err = sg_set_reserved_size(q, arg);
 595                         break;
 596                 case SG_EMULATED_HOST:
 597                         err = sg_emulated_host(q, arg);
 598                         break;
 599                 case SG_IO: {
 600                         struct sg_io_hdr hdr;
 601
 602                         err = -EFAULT;
 603                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 604                                 break;
 605                         err = sg_io(q, bd_disk, &hdr, mode);
 606                         if (err == -EFAULT)
 607                                 break;
 608
 609                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 610                                 err = -EFAULT;
 611                         break;
 612                 }
 613                 case CDROM_SEND_PACKET: {
 614                         struct cdrom_generic_command cgc;
 615                         struct sg_io_hdr hdr;
 616
 617                         err = -EFAULT;
 618                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 619                                 break;
 620                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 621                         memset(&hdr, 0, sizeof(hdr));
 622                         hdr.interface_id = 'S';
 623                         hdr.cmd_len = sizeof(cgc.cmd);
 624                         hdr.dxfer_len = cgc.buflen;
 625                         err = 0;
 626                         switch (cgc.data_direction) {
 627                                 case CGC_DATA_UNKNOWN:
 628                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 629                                         break;
 630                                 case CGC_DATA_WRITE:
 631                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 632                                         break;
 633                                 case CGC_DATA_READ:
 634                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 635                                         break;
 636                                 case CGC_DATA_NONE:
 637                                         hdr.dxfer_direction = SG_DXFER_NONE;
 638                                         break;
 639                                 default:
 640                                         err = -EINVAL;
 641                         }
 642                         if (err)
 643                                 break;
 644
 645                         hdr.dxferp = cgc.buffer;
 646                         hdr.sbp = cgc.sense;
 647                         if (hdr.sbp)
 648                                 hdr.mx_sb_len = sizeof(struct request_sense);
 649                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 650                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 651                         hdr.cmd_len = sizeof(cgc.cmd);
 652
 653                         err = sg_io(q, bd_disk, &hdr, mode);
 654                         if (err == -EFAULT)
 655                                 break;
 656
 657                         if (hdr.status)
 658                                 err = -EIO;
 659
 660                         cgc.stat = err;
 661                         cgc.buflen = hdr.resid;
 662                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 663                                 err = -EFAULT;
 664
 665                         break;
 666                 }
 667
 668                 /*
 669                  * old junk scsi send command ioctl
 670                  */
 671                 case SCSI_IOCTL_SEND_COMMAND:
 672                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 673                         err = -EINVAL;
 674                         if (!arg)
 675                                 break;
 676
 677                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 678                         break;
 679                 case CDROMCLOSETRAY:
 680                         err = blk_send_start_stop(q, bd_disk, 0x03);
 681                         break;
 682                 case CDROMEJECT:
 683                         err = blk_send_start_stop(q, bd_disk, 0x02);
 684                         break;
 685                 default:
 686                         err = -ENOTTY;
 687         }
 688
 689         blk_put_queue(q);
 690         return err;
 691 }
 692 EXPORT_SYMBOL(scsi_cmd_ioctl);
 693
 694 static int __init blk_scsi_ioctl_init(void)
 695 {
 696         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 697         return 0;
 698 }
 699 fs_initcall(blk_scsi_ioctl_init);