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/ratelimit.h>
  28 #include <linux/slab.h>
  29 #include <linux/times.h>
  30 #include <linux/uio.h>
  31 #include <asm/uaccess.h>
  32
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_ioctl.h>
  35 #include <scsi/scsi_cmnd.h>
  36
  37 struct blk_cmd_filter {
  38         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  39         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  40 };
  41
  42 static struct blk_cmd_filter blk_default_cmd_filter;
  43
  44 /* Command group 3 is reserved and should never be used.  */
  45 const unsigned char scsi_command_size_tbl[8] =
  46 {
  47         6, 10, 10, 12,
  48         16, 12, 10, 10
  49 };
  50 EXPORT_SYMBOL(scsi_command_size_tbl);
  51
  52 #include <scsi/sg.h>
  53
  54 static int sg_get_version(int __user *p)
  55 {
  56         static const int sg_version_num = 30527;
  57         return put_user(sg_version_num, p);
  58 }
  59
  60 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  61 {
  62         return put_user(0, p);
  63 }
  64
  65 static int scsi_get_bus(struct request_queue *q, int __user *p)
  66 {
  67         return put_user(0, p);
  68 }
  69
  70 static int sg_get_timeout(struct request_queue *q)
  71 {
  72         return jiffies_to_clock_t(q->sg_timeout);
  73 }
  74
  75 static int sg_set_timeout(struct request_queue *q, int __user *p)
  76 {
  77         int timeout, err = get_user(timeout, p);
  78
  79         if (!err)
  80                 q->sg_timeout = clock_t_to_jiffies(timeout);
  81
  82         return err;
  83 }
  84
  85 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  86 {
  87         unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
  88
  89         return put_user(val, p);
  90 }
  91
  92 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
  93 {
  94         int size, err = get_user(size, p);
  95
  96         if (err)
  97                 return err;
  98
  99         if (size < 0)
 100                 return -EINVAL;
 101         if (size > (queue_max_sectors(q) << 9))
 102                 size = queue_max_sectors(q) << 9;
 103
 104         q->sg_reserved_size = size;
 105         return 0;
 106 }
 107
 108 /*
 109  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 110  * so sure this is worth doing anything about (why would you care??)
 111  */
 112 static int sg_emulated_host(struct request_queue *q, int __user *p)
 113 {
 114         return put_user(1, p);
 115 }
 116
 117 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 118 {
 119         /* Basic read-only commands */
 120         __set_bit(TEST_UNIT_READY, filter->read_ok);
 121         __set_bit(REQUEST_SENSE, filter->read_ok);
 122         __set_bit(READ_6, filter->read_ok);
 123         __set_bit(READ_10, filter->read_ok);
 124         __set_bit(READ_12, filter->read_ok);
 125         __set_bit(READ_16, filter->read_ok);
 126         __set_bit(READ_BUFFER, filter->read_ok);
 127         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 128         __set_bit(READ_CAPACITY, filter->read_ok);
 129         __set_bit(READ_LONG, filter->read_ok);
 130         __set_bit(INQUIRY, filter->read_ok);
 131         __set_bit(MODE_SENSE, filter->read_ok);
 132         __set_bit(MODE_SENSE_10, filter->read_ok);
 133         __set_bit(LOG_SENSE, filter->read_ok);
 134         __set_bit(START_STOP, filter->read_ok);
 135         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 136         __set_bit(VERIFY_16, filter->read_ok);
 137         __set_bit(REPORT_LUNS, filter->read_ok);
 138         __set_bit(SERVICE_ACTION_IN, filter->read_ok);
 139         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 140         __set_bit(MAINTENANCE_IN, filter->read_ok);
 141         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 142
 143         /* Audio CD commands */
 144         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 145         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 146         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 147         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 148         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 149
 150         /* CD/DVD data reading */
 151         __set_bit(GPCMD_READ_CD, filter->read_ok);
 152         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 153         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 154         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 155         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 156         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 157         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 158         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 159         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 160         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 161         __set_bit(GPCMD_SCAN, filter->read_ok);
 162         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 163         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 164         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 165         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 166         __set_bit(GPCMD_SEEK, filter->read_ok);
 167         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 168
 169         /* Basic writing commands */
 170         __set_bit(WRITE_6, filter->write_ok);
 171         __set_bit(WRITE_10, filter->write_ok);
 172         __set_bit(WRITE_VERIFY, filter->write_ok);
 173         __set_bit(WRITE_12, filter->write_ok);
 174         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 175         __set_bit(WRITE_16, filter->write_ok);
 176         __set_bit(WRITE_LONG, filter->write_ok);
 177         __set_bit(WRITE_LONG_2, filter->write_ok);
 178         __set_bit(ERASE, filter->write_ok);
 179         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 180         __set_bit(MODE_SELECT, filter->write_ok);
 181         __set_bit(LOG_SELECT, filter->write_ok);
 182         __set_bit(GPCMD_BLANK, filter->write_ok);
 183         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 184         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 185         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 186         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 187         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 188         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 189         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 190         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 191         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 192         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 193         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 194         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 195         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 196         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 197         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 198 }
 199
 200 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 201 {
 202         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 203
 204         /* root can do any command. */
 205         if (capable(CAP_SYS_RAWIO))
 206                 return 0;
 207
 208         /* if there's no filter set, assume we're filtering everything out */
 209         if (!filter)
 210                 return -EPERM;
 211
 212         /* Anybody who can open the device can do a read-safe command */
 213         if (test_bit(cmd[0], filter->read_ok))
 214                 return 0;
 215
 216         /* Write-safe commands require a writable open */
 217         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 218                 return 0;
 219
 220         return -EPERM;
 221 }
 222 EXPORT_SYMBOL(blk_verify_command);
 223
 224 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 225                              struct sg_io_hdr *hdr, fmode_t mode)
 226 {
 227         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 228                 return -EFAULT;
 229         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 230                 return -EPERM;
 231
 232         /*
 233          * fill in request structure
 234          */
 235         rq->cmd_len = hdr->cmd_len;
 236         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 237
 238         rq->timeout = msecs_to_jiffies(hdr->timeout);
 239         if (!rq->timeout)
 240                 rq->timeout = q->sg_timeout;
 241         if (!rq->timeout)
 242                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 243         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 244                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 245
 246         return 0;
 247 }
 248
 249 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 250                                  struct bio *bio)
 251 {
 252         int r, ret = 0;
 253
 254         /*
 255          * fill in all the output members
 256          */
 257         hdr->status = rq->errors & 0xff;
 258         hdr->masked_status = status_byte(rq->errors);
 259         hdr->msg_status = msg_byte(rq->errors);
 260         hdr->host_status = host_byte(rq->errors);
 261         hdr->driver_status = driver_byte(rq->errors);
 262         hdr->info = 0;
 263         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 264                 hdr->info |= SG_INFO_CHECK;
 265         hdr->resid = rq->resid_len;
 266         hdr->sb_len_wr = 0;
 267
 268         if (rq->sense_len && hdr->sbp) {
 269                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 270
 271                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 272                         hdr->sb_len_wr = len;
 273                 else
 274                         ret = -EFAULT;
 275         }
 276
 277         r = blk_rq_unmap_user(bio);
 278         if (!ret)
 279                 ret = r;
 280         blk_put_request(rq);
 281
 282         return ret;
 283 }
 284
 285 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 286                 struct sg_io_hdr *hdr, fmode_t mode)
 287 {
 288         unsigned long start_time;
 289         int writing = 0, ret = 0;
 290         struct request *rq;
 291         char sense[SCSI_SENSE_BUFFERSIZE];
 292         struct bio *bio;
 293
 294         if (hdr->interface_id != 'S')
 295                 return -EINVAL;
 296         if (hdr->cmd_len > BLK_MAX_CDB)
 297                 return -EINVAL;
 298
 299         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 300                 return -EIO;
 301
 302         if (hdr->dxfer_len)
 303                 switch (hdr->dxfer_direction) {
 304                 default:
 305                         return -EINVAL;
 306                 case SG_DXFER_TO_DEV:
 307                         writing = 1;
 308                         break;
 309                 case SG_DXFER_TO_FROM_DEV:
 310                 case SG_DXFER_FROM_DEV:
 311                         break;
 312                 }
 313
 314         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 315         if (!rq)
 316                 return -ENOMEM;
 317
 318         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 319                 blk_put_request(rq);
 320                 return -EFAULT;
 321         }
 322
 323         if (hdr->iovec_count) {
 324                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 325                 size_t iov_data_len;
 326                 struct sg_iovec *sg_iov;
 327                 struct iovec *iov;
 328                 int i;
 329
 330                 sg_iov = kmalloc(size, GFP_KERNEL);
 331                 if (!sg_iov) {
 332                         ret = -ENOMEM;
 333                         goto out;
 334                 }
 335
 336                 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
 337                         kfree(sg_iov);
 338                         ret = -EFAULT;
 339                         goto out;
 340                 }
 341
 342                 /*
 343                  * Sum up the vecs, making sure they don't overflow
 344                  */
 345                 iov = (struct iovec *) sg_iov;
 346                 iov_data_len = 0;
 347                 for (i = 0; i < hdr->iovec_count; i++) {
 348                         if (iov_data_len + iov[i].iov_len < iov_data_len) {
 349                                 kfree(sg_iov);
 350                                 ret = -EINVAL;
 351                                 goto out;
 352                         }
 353                         iov_data_len += iov[i].iov_len;
 354                 }
 355
 356                 /* SG_IO howto says that the shorter of the two wins */
 357                 if (hdr->dxfer_len < iov_data_len) {
 358                         hdr->iovec_count = iov_shorten(iov,
 359                                                        hdr->iovec_count,
 360                                                        hdr->dxfer_len);
 361                         iov_data_len = hdr->dxfer_len;
 362                 }
 363
 364                 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
 365                                           iov_data_len, GFP_KERNEL);
 366                 kfree(sg_iov);
 367         } else if (hdr->dxfer_len)
 368                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 369                                       GFP_KERNEL);
 370
 371         if (ret)
 372                 goto out;
 373
 374         bio = rq->bio;
 375         memset(sense, 0, sizeof(sense));
 376         rq->sense = sense;
 377         rq->sense_len = 0;
 378         rq->retries = 0;
 379
 380         start_time = jiffies;
 381
 382         /* ignore return value. All information is passed back to caller
 383          * (if he doesn't check that is his problem).
 384          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 385          */
 386         blk_execute_rq(q, bd_disk, rq, 0);
 387
 388         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 389
 390         return blk_complete_sghdr_rq(rq, hdr, bio);
 391 out:
 392         blk_put_request(rq);
 393         return ret;
 394 }
 395
 396 /**
 397  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 398  * @file:       file this ioctl operates on (optional)
 399  * @q:          request queue to send scsi commands down
 400  * @disk:       gendisk to operate on (option)
 401  * @sic:        userspace structure describing the command to perform
 402  *
 403  * Send down the scsi command described by @sic to the device below
 404  * the request queue @q.  If @file is non-NULL it's used to perform
 405  * fine-grained permission checks that allow users to send down
 406  * non-destructive SCSI commands.  If the caller has a struct gendisk
 407  * available it should be passed in as @disk to allow the low level
 408  * driver to use the information contained in it.  A non-NULL @disk
 409  * is only allowed if the caller knows that the low level driver doesn't
 410  * need it (e.g. in the scsi subsystem).
 411  *
 412  * Notes:
 413  *   -  This interface is deprecated - users should use the SG_IO
 414  *      interface instead, as this is a more flexible approach to
 415  *      performing SCSI commands on a device.
 416  *   -  The SCSI command length is determined by examining the 1st byte
 417  *      of the given command. There is no way to override this.
 418  *   -  Data transfers are limited to PAGE_SIZE
 419  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 420  *      accommodate the sense buffer when an error occurs.
 421  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 422  *      old code will not be surprised.
 423  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 424  *      a negative return and the Unix error code in 'errno'.
 425  *      If the SCSI command succeeds then 0 is returned.
 426  *      Positive numbers returned are the compacted SCSI error codes (4
 427  *      bytes in one int) where the lowest byte is the SCSI status.
 428  */
 429 #define OMAX_SB_LEN 16          /* For backward compatibility */
 430 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 431                 struct scsi_ioctl_command __user *sic)
 432 {
 433         struct request *rq;
 434         int err;
 435         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 436         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 437
 438         if (!sic)
 439                 return -EINVAL;
 440
 441         /*
 442          * get in an out lengths, verify they don't exceed a page worth of data
 443          */
 444         if (get_user(in_len, &sic->inlen))
 445                 return -EFAULT;
 446         if (get_user(out_len, &sic->outlen))
 447                 return -EFAULT;
 448         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 449                 return -EINVAL;
 450         if (get_user(opcode, sic->data))
 451                 return -EFAULT;
 452
 453         bytes = max(in_len, out_len);
 454         if (bytes) {
 455                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 456                 if (!buffer)
 457                         return -ENOMEM;
 458
 459         }
 460
 461         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 462
 463         cmdlen = COMMAND_SIZE(opcode);
 464
 465         /*
 466          * get command and data to send to device, if any
 467          */
 468         err = -EFAULT;
 469         rq->cmd_len = cmdlen;
 470         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 471                 goto error;
 472
 473         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 474                 goto error;
 475
 476         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 477         if (err)
 478                 goto error;
 479
 480         /* default.  possible overriden later */
 481         rq->retries = 5;
 482
 483         switch (opcode) {
 484         case SEND_DIAGNOSTIC:
 485         case FORMAT_UNIT:
 486                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 487                 rq->retries = 1;
 488                 break;
 489         case START_STOP:
 490                 rq->timeout = START_STOP_TIMEOUT;
 491                 break;
 492         case MOVE_MEDIUM:
 493                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 494                 break;
 495         case READ_ELEMENT_STATUS:
 496                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 497                 break;
 498         case READ_DEFECT_DATA:
 499                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 500                 rq->retries = 1;
 501                 break;
 502         default:
 503                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 504                 break;
 505         }
 506
 507         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 508                 err = DRIVER_ERROR << 24;
 509                 goto out;
 510         }
 511
 512         memset(sense, 0, sizeof(sense));
 513         rq->sense = sense;
 514         rq->sense_len = 0;
 515         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 516
 517         blk_execute_rq(q, disk, rq, 0);
 518
 519 out:
 520         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 521         if (err) {
 522                 if (rq->sense_len && rq->sense) {
 523                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 524                                 rq->sense_len : OMAX_SB_LEN;
 525                         if (copy_to_user(sic->data, rq->sense, bytes))
 526                                 err = -EFAULT;
 527                 }
 528         } else {
 529                 if (copy_to_user(sic->data, buffer, out_len))
 530                         err = -EFAULT;
 531         }
 532
 533 error:
 534         kfree(buffer);
 535         blk_put_request(rq);
 536         return err;
 537 }
 538 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 539
 540 /* Send basic block requests */
 541 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 542                               int cmd, int data)
 543 {
 544         struct request *rq;
 545         int err;
 546
 547         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 548         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 549         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 550         rq->cmd[0] = cmd;
 551         rq->cmd[4] = data;
 552         rq->cmd_len = 6;
 553         err = blk_execute_rq(q, bd_disk, rq, 0);
 554         blk_put_request(rq);
 555
 556         return err;
 557 }
 558
 559 static inline int blk_send_start_stop(struct request_queue *q,
 560                                       struct gendisk *bd_disk, int data)
 561 {
 562         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 563 }
 564
 565 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 566                    unsigned int cmd, void __user *arg)
 567 {
 568         int err;
 569
 570         if (!q)
 571                 return -ENXIO;
 572
 573         switch (cmd) {
 574                 /*
 575                  * new sgv3 interface
 576                  */
 577                 case SG_GET_VERSION_NUM:
 578                         err = sg_get_version(arg);
 579                         break;
 580                 case SCSI_IOCTL_GET_IDLUN:
 581                         err = scsi_get_idlun(q, arg);
 582                         break;
 583                 case SCSI_IOCTL_GET_BUS_NUMBER:
 584                         err = scsi_get_bus(q, arg);
 585                         break;
 586                 case SG_SET_TIMEOUT:
 587                         err = sg_set_timeout(q, arg);
 588                         break;
 589                 case SG_GET_TIMEOUT:
 590                         err = sg_get_timeout(q);
 591                         break;
 592                 case SG_GET_RESERVED_SIZE:
 593                         err = sg_get_reserved_size(q, arg);
 594                         break;
 595                 case SG_SET_RESERVED_SIZE:
 596                         err = sg_set_reserved_size(q, arg);
 597                         break;
 598                 case SG_EMULATED_HOST:
 599                         err = sg_emulated_host(q, arg);
 600                         break;
 601                 case SG_IO: {
 602                         struct sg_io_hdr hdr;
 603
 604                         err = -EFAULT;
 605                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 606                                 break;
 607                         err = sg_io(q, bd_disk, &hdr, mode);
 608                         if (err == -EFAULT)
 609                                 break;
 610
 611                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 612                                 err = -EFAULT;
 613                         break;
 614                 }
 615                 case CDROM_SEND_PACKET: {
 616                         struct cdrom_generic_command cgc;
 617                         struct sg_io_hdr hdr;
 618
 619                         err = -EFAULT;
 620                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 621                                 break;
 622                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 623                         memset(&hdr, 0, sizeof(hdr));
 624                         hdr.interface_id = 'S';
 625                         hdr.cmd_len = sizeof(cgc.cmd);
 626                         hdr.dxfer_len = cgc.buflen;
 627                         err = 0;
 628                         switch (cgc.data_direction) {
 629                                 case CGC_DATA_UNKNOWN:
 630                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 631                                         break;
 632                                 case CGC_DATA_WRITE:
 633                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 634                                         break;
 635                                 case CGC_DATA_READ:
 636                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 637                                         break;
 638                                 case CGC_DATA_NONE:
 639                                         hdr.dxfer_direction = SG_DXFER_NONE;
 640                                         break;
 641                                 default:
 642                                         err = -EINVAL;
 643                         }
 644                         if (err)
 645                                 break;
 646
 647                         hdr.dxferp = cgc.buffer;
 648                         hdr.sbp = cgc.sense;
 649                         if (hdr.sbp)
 650                                 hdr.mx_sb_len = sizeof(struct request_sense);
 651                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 652                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 653                         hdr.cmd_len = sizeof(cgc.cmd);
 654
 655                         err = sg_io(q, bd_disk, &hdr, mode);
 656                         if (err == -EFAULT)
 657                                 break;
 658
 659                         if (hdr.status)
 660                                 err = -EIO;
 661
 662                         cgc.stat = err;
 663                         cgc.buflen = hdr.resid;
 664                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 665                                 err = -EFAULT;
 666
 667                         break;
 668                 }
 669
 670                 /*
 671                  * old junk scsi send command ioctl
 672                  */
 673                 case SCSI_IOCTL_SEND_COMMAND:
 674                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 675                         err = -EINVAL;
 676                         if (!arg)
 677                                 break;
 678
 679                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 680                         break;
 681                 case CDROMCLOSETRAY:
 682                         err = blk_send_start_stop(q, bd_disk, 0x03);
 683                         break;
 684                 case CDROMEJECT:
 685                         err = blk_send_start_stop(q, bd_disk, 0x02);
 686                         break;
 687                 default:
 688                         err = -ENOTTY;
 689         }
 690
 691         return err;
 692 }
 693 EXPORT_SYMBOL(scsi_cmd_ioctl);
 694
 695 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 696 {
 697         if (bd && bd == bd->bd_contains)
 698                 return 0;
 699
 700         /* Actually none of these is particularly useful on a partition,
 701          * but they are safe.
 702          */
 703         switch (cmd) {
 704         case SCSI_IOCTL_GET_IDLUN:
 705         case SCSI_IOCTL_GET_BUS_NUMBER:
 706         case SCSI_IOCTL_GET_PCI:
 707         case SCSI_IOCTL_PROBE_HOST:
 708         case SG_GET_VERSION_NUM:
 709         case SG_SET_TIMEOUT:
 710         case SG_GET_TIMEOUT:
 711         case SG_GET_RESERVED_SIZE:
 712         case SG_SET_RESERVED_SIZE:
 713         case SG_EMULATED_HOST:
 714                 return 0;
 715         case CDROM_GET_CAPABILITY:
 716                 /* Keep this until we remove the printk below.  udev sends it
 717                  * and we do not want to spam dmesg about it.   CD-ROMs do
 718                  * not have partitions, so we get here only for disks.
 719                  */
 720                 return -ENOIOCTLCMD;
 721         default:
 722                 break;
 723         }
 724
 725         if (capable(CAP_SYS_RAWIO))
 726                 return 0;
 727
 728         /* In particular, rule out all resets and host-specific ioctls.  */
 729         printk_ratelimited(KERN_WARNING
 730                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 731
 732         return -ENOIOCTLCMD;
 733 }
 734 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 735
 736 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 737                        unsigned int cmd, void __user *arg)
 738 {
 739         int ret;
 740
 741         ret = scsi_verify_blk_ioctl(bd, cmd);
 742         if (ret < 0)
 743                 return ret;
 744
 745         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 746 }
 747 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 748
 749 static int __init blk_scsi_ioctl_init(void)
 750 {
 751         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 752         return 0;
 753 }
 754 fs_initcall(blk_scsi_ioctl_init);