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