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 <linux/uaccess.h>
  32 #include <linux/fd.h>
  33 #include <linux/raid/md_u.h>
  34 #include <linux/mtio.h>
  35
  36 #include <scsi/scsi.h>
  37 #include <scsi/scsi_ioctl.h>
  38 #include <scsi/scsi_cmnd.h>
  39
  40 struct blk_cmd_filter {
  41         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  42         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  43 };
  44
  45 static struct blk_cmd_filter blk_default_cmd_filter;
  46
  47 /* Command group 3 is reserved and should never be used.  */
  48 const unsigned char scsi_command_size_tbl[8] =
  49 {
  50         6, 10, 10, 12,
  51         16, 12, 10, 10
  52 };
  53 EXPORT_SYMBOL(scsi_command_size_tbl);
  54
  55 #include <scsi/sg.h>
  56
  57 static int sg_get_version(int __user *p)
  58 {
  59         static const int sg_version_num = 30527;
  60         return put_user(sg_version_num, p);
  61 }
  62
  63 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  64 {
  65         return put_user(0, p);
  66 }
  67
  68 static int scsi_get_bus(struct request_queue *q, int __user *p)
  69 {
  70         return put_user(0, p);
  71 }
  72
  73 static int sg_get_timeout(struct request_queue *q)
  74 {
  75         return jiffies_to_clock_t(q->sg_timeout);
  76 }
  77
  78 static int sg_set_timeout(struct request_queue *q, int __user *p)
  79 {
  80         int timeout, err = get_user(timeout, p);
  81
  82         if (!err)
  83                 q->sg_timeout = clock_t_to_jiffies(timeout);
  84
  85         return err;
  86 }
  87
  88 static int max_sectors_bytes(struct request_queue *q)
  89 {
  90         unsigned int max_sectors = queue_max_sectors(q);
  91
  92         max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
  93
  94         return max_sectors << 9;
  95 }
  96
  97 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  98 {
  99         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
 100
 101         return put_user(val, p);
 102 }
 103
 104 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
 105 {
 106         int size, err = get_user(size, p);
 107
 108         if (err)
 109                 return err;
 110
 111         if (size < 0)
 112                 return -EINVAL;
 113
 114         q->sg_reserved_size = min(size, max_sectors_bytes(q));
 115         return 0;
 116 }
 117
 118 /*
 119  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 120  * so sure this is worth doing anything about (why would you care??)
 121  */
 122 static int sg_emulated_host(struct request_queue *q, int __user *p)
 123 {
 124         return put_user(1, p);
 125 }
 126
 127 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 128 {
 129         /* Basic read-only commands */
 130         __set_bit(TEST_UNIT_READY, filter->read_ok);
 131         __set_bit(REQUEST_SENSE, filter->read_ok);
 132         __set_bit(READ_6, filter->read_ok);
 133         __set_bit(READ_10, filter->read_ok);
 134         __set_bit(READ_12, filter->read_ok);
 135         __set_bit(READ_16, filter->read_ok);
 136         __set_bit(READ_BUFFER, filter->read_ok);
 137         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 138         __set_bit(READ_CAPACITY, filter->read_ok);
 139         __set_bit(READ_LONG, filter->read_ok);
 140         __set_bit(INQUIRY, filter->read_ok);
 141         __set_bit(MODE_SENSE, filter->read_ok);
 142         __set_bit(MODE_SENSE_10, filter->read_ok);
 143         __set_bit(LOG_SENSE, filter->read_ok);
 144         __set_bit(START_STOP, filter->read_ok);
 145         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 146         __set_bit(VERIFY_16, filter->read_ok);
 147         __set_bit(REPORT_LUNS, filter->read_ok);
 148         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
 149         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 150         __set_bit(MAINTENANCE_IN, filter->read_ok);
 151         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 152
 153         /* Audio CD commands */
 154         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 155         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 156         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 157         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 158         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 159
 160         /* CD/DVD data reading */
 161         __set_bit(GPCMD_READ_CD, filter->read_ok);
 162         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 163         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 164         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 165         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 166         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 167         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 168         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 169         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 170         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 171         __set_bit(GPCMD_SCAN, filter->read_ok);
 172         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 173         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 174         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 175         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 176         __set_bit(GPCMD_SEEK, filter->read_ok);
 177         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 178
 179         /* Basic writing commands */
 180         __set_bit(WRITE_6, filter->write_ok);
 181         __set_bit(WRITE_10, filter->write_ok);
 182         __set_bit(WRITE_VERIFY, filter->write_ok);
 183         __set_bit(WRITE_12, filter->write_ok);
 184         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 185         __set_bit(WRITE_16, filter->write_ok);
 186         __set_bit(WRITE_LONG, filter->write_ok);
 187         __set_bit(WRITE_LONG_2, filter->write_ok);
 188         __set_bit(WRITE_SAME, filter->write_ok);
 189         __set_bit(WRITE_SAME_16, filter->write_ok);
 190         __set_bit(WRITE_SAME_32, filter->write_ok);
 191         __set_bit(ERASE, filter->write_ok);
 192         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 193         __set_bit(MODE_SELECT, filter->write_ok);
 194         __set_bit(LOG_SELECT, filter->write_ok);
 195         __set_bit(GPCMD_BLANK, filter->write_ok);
 196         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 197         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 198         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 199         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 200         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 201         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 202         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 203         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 204         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 205         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 206         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 207         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 208         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 209         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 210         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 211 }
 212
 213 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 214 {
 215         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 216
 217         /* root can do any command. */
 218         if (capable(CAP_SYS_RAWIO))
 219                 return 0;
 220
 221         /* Anybody who can open the device can do a read-safe command */
 222         if (test_bit(cmd[0], filter->read_ok))
 223                 return 0;
 224
 225         /* Write-safe commands require a writable open */
 226         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 227                 return 0;
 228
 229         return -EPERM;
 230 }
 231 EXPORT_SYMBOL(blk_verify_command);
 232
 233 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 234                              struct sg_io_hdr *hdr, fmode_t mode)
 235 {
 236         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 237                 return -EFAULT;
 238         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 239                 return -EPERM;
 240
 241         /*
 242          * fill in request structure
 243          */
 244         rq->cmd_len = hdr->cmd_len;
 245
 246         rq->timeout = msecs_to_jiffies(hdr->timeout);
 247         if (!rq->timeout)
 248                 rq->timeout = q->sg_timeout;
 249         if (!rq->timeout)
 250                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 251         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 252                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 253
 254         return 0;
 255 }
 256
 257 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 258                                  struct bio *bio)
 259 {
 260         int r, ret = 0;
 261
 262         /*
 263          * fill in all the output members
 264          */
 265         hdr->status = rq->errors & 0xff;
 266         hdr->masked_status = status_byte(rq->errors);
 267         hdr->msg_status = msg_byte(rq->errors);
 268         hdr->host_status = host_byte(rq->errors);
 269         hdr->driver_status = driver_byte(rq->errors);
 270         hdr->info = 0;
 271         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 272                 hdr->info |= SG_INFO_CHECK;
 273         hdr->resid = rq->resid_len;
 274         hdr->sb_len_wr = 0;
 275
 276         if (rq->sense_len && hdr->sbp) {
 277                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 278
 279                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 280                         hdr->sb_len_wr = len;
 281                 else
 282                         ret = -EFAULT;
 283         }
 284
 285         r = blk_rq_unmap_user(bio);
 286         if (!ret)
 287                 ret = r;
 288
 289         return ret;
 290 }
 291
 292 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 293                 struct sg_io_hdr *hdr, fmode_t mode)
 294 {
 295         unsigned long start_time;
 296         ssize_t ret = 0;
 297         int writing = 0;
 298         int at_head = 0;
 299         struct request *rq;
 300         char sense[SCSI_SENSE_BUFFERSIZE];
 301         struct bio *bio;
 302
 303         if (hdr->interface_id != 'S')
 304                 return -EINVAL;
 305
 306         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 307                 return -EIO;
 308
 309         if (hdr->dxfer_len)
 310                 switch (hdr->dxfer_direction) {
 311                 default:
 312                         return -EINVAL;
 313                 case SG_DXFER_TO_DEV:
 314                         writing = 1;
 315                         break;
 316                 case SG_DXFER_TO_FROM_DEV:
 317                 case SG_DXFER_FROM_DEV:
 318                         break;
 319                 }
 320         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
 321                 at_head = 1;
 322
 323         ret = -ENOMEM;
 324         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 325         if (IS_ERR(rq))
 326                 return PTR_ERR(rq);
 327         blk_rq_set_block_pc(rq);
 328
 329         if (hdr->cmd_len > BLK_MAX_CDB) {
 330                 rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
 331                 if (!rq->cmd)
 332                         goto out_put_request;
 333         }
 334
 335         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
 336         if (ret < 0)
 337                 goto out_free_cdb;
 338
 339         ret = 0;
 340         if (hdr->iovec_count) {
 341                 struct iov_iter i;
 342                 struct iovec *iov = NULL;
 343
 344                 ret = import_iovec(rq_data_dir(rq),
 345                                    hdr->dxferp, hdr->iovec_count,
 346                                    0, &iov, &i);
 347                 if (ret < 0)
 348                         goto out_free_cdb;
 349
 350                 /* SG_IO howto says that the shorter of the two wins */
 351                 iov_iter_truncate(&i, hdr->dxfer_len);
 352
 353                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
 354                 kfree(iov);
 355         } else if (hdr->dxfer_len)
 356                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 357                                       GFP_KERNEL);
 358
 359         if (ret)
 360                 goto out_free_cdb;
 361
 362         bio = rq->bio;
 363         memset(sense, 0, sizeof(sense));
 364         rq->sense = sense;
 365         rq->sense_len = 0;
 366         rq->retries = 0;
 367
 368         start_time = jiffies;
 369
 370         /* ignore return value. All information is passed back to caller
 371          * (if he doesn't check that is his problem).
 372          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 373          */
 374         blk_execute_rq(q, bd_disk, rq, at_head);
 375
 376         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 377
 378         ret = blk_complete_sghdr_rq(rq, hdr, bio);
 379
 380 out_free_cdb:
 381         if (rq->cmd != rq->__cmd)
 382                 kfree(rq->cmd);
 383 out_put_request:
 384         blk_put_request(rq);
 385         return ret;
 386 }
 387
 388 /**
 389  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 390  * @file:       file this ioctl operates on (optional)
 391  * @q:          request queue to send scsi commands down
 392  * @disk:       gendisk to operate on (option)
 393  * @sic:        userspace structure describing the command to perform
 394  *
 395  * Send down the scsi command described by @sic to the device below
 396  * the request queue @q.  If @file is non-NULL it's used to perform
 397  * fine-grained permission checks that allow users to send down
 398  * non-destructive SCSI commands.  If the caller has a struct gendisk
 399  * available it should be passed in as @disk to allow the low level
 400  * driver to use the information contained in it.  A non-NULL @disk
 401  * is only allowed if the caller knows that the low level driver doesn't
 402  * need it (e.g. in the scsi subsystem).
 403  *
 404  * Notes:
 405  *   -  This interface is deprecated - users should use the SG_IO
 406  *      interface instead, as this is a more flexible approach to
 407  *      performing SCSI commands on a device.
 408  *   -  The SCSI command length is determined by examining the 1st byte
 409  *      of the given command. There is no way to override this.
 410  *   -  Data transfers are limited to PAGE_SIZE
 411  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 412  *      accommodate the sense buffer when an error occurs.
 413  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 414  *      old code will not be surprised.
 415  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 416  *      a negative return and the Unix error code in 'errno'.
 417  *      If the SCSI command succeeds then 0 is returned.
 418  *      Positive numbers returned are the compacted SCSI error codes (4
 419  *      bytes in one int) where the lowest byte is the SCSI status.
 420  */
 421 #define OMAX_SB_LEN 16          /* For backward compatibility */
 422 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 423                 struct scsi_ioctl_command __user *sic)
 424 {
 425         struct request *rq;
 426         int err;
 427         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 428         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 429
 430         if (!sic)
 431                 return -EINVAL;
 432
 433         /*
 434          * get in an out lengths, verify they don't exceed a page worth of data
 435          */
 436         if (get_user(in_len, &sic->inlen))
 437                 return -EFAULT;
 438         if (get_user(out_len, &sic->outlen))
 439                 return -EFAULT;
 440         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 441                 return -EINVAL;
 442         if (get_user(opcode, sic->data))
 443                 return -EFAULT;
 444
 445         bytes = max(in_len, out_len);
 446         if (bytes) {
 447                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 448                 if (!buffer)
 449                         return -ENOMEM;
 450
 451         }
 452
 453         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_RECLAIM);
 454         if (IS_ERR(rq)) {
 455                 err = PTR_ERR(rq);
 456                 goto error_free_buffer;
 457         }
 458         blk_rq_set_block_pc(rq);
 459
 460         cmdlen = COMMAND_SIZE(opcode);
 461
 462         /*
 463          * get command and data to send to device, if any
 464          */
 465         err = -EFAULT;
 466         rq->cmd_len = cmdlen;
 467         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 468                 goto error;
 469
 470         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 471                 goto error;
 472
 473         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 474         if (err)
 475                 goto error;
 476
 477         /* default.  possible overriden later */
 478         rq->retries = 5;
 479
 480         switch (opcode) {
 481         case SEND_DIAGNOSTIC:
 482         case FORMAT_UNIT:
 483                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 484                 rq->retries = 1;
 485                 break;
 486         case START_STOP:
 487                 rq->timeout = START_STOP_TIMEOUT;
 488                 break;
 489         case MOVE_MEDIUM:
 490                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 491                 break;
 492         case READ_ELEMENT_STATUS:
 493                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 494                 break;
 495         case READ_DEFECT_DATA:
 496                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 497                 rq->retries = 1;
 498                 break;
 499         default:
 500                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 501                 break;
 502         }
 503
 504         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
 505                 err = DRIVER_ERROR << 24;
 506                 goto error;
 507         }
 508
 509         memset(sense, 0, sizeof(sense));
 510         rq->sense = sense;
 511         rq->sense_len = 0;
 512
 513         blk_execute_rq(q, disk, rq, 0);
 514
 515         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 516         if (err) {
 517                 if (rq->sense_len && rq->sense) {
 518                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 519                                 rq->sense_len : OMAX_SB_LEN;
 520                         if (copy_to_user(sic->data, rq->sense, bytes))
 521                                 err = -EFAULT;
 522                 }
 523         } else {
 524                 if (copy_to_user(sic->data, buffer, out_len))
 525                         err = -EFAULT;
 526         }
 527
 528 error:
 529         blk_put_request(rq);
 530
 531 error_free_buffer:
 532         kfree(buffer);
 533
 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_RECLAIM);
 546         if (IS_ERR(rq))
 547                 return PTR_ERR(rq);
 548         blk_rq_set_block_pc(rq);
 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         case BLKFLSBUF:
 715         case BLKROSET:
 716                 return 0;
 717         case CDROM_GET_CAPABILITY:
 718         case CDROM_DRIVE_STATUS:
 719         case FDGETPRM:
 720         case RAID_VERSION:
 721         case MTIOCGET:
 722 #ifdef CONFIG_COMPAT
 723         case 0x801c6d02:        /* MTIOCGET32 */
 724 #endif
 725                 /* Keep this until we remove the printk below.  udev sends it
 726                  * and we do not want to spam dmesg about it.   CD-ROMs do
 727                  * not have partitions, so we get here only for disks.
 728                  */
 729                 return -ENOIOCTLCMD;
 730         default:
 731                 break;
 732         }
 733
 734         if (capable(CAP_SYS_RAWIO))
 735                 return 0;
 736
 737         /* In particular, rule out all resets and host-specific ioctls.  */
 738         printk_ratelimited(KERN_WARNING
 739                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 740
 741         return -ENOIOCTLCMD;
 742 }
 743 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 744
 745 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 746                        unsigned int cmd, void __user *arg)
 747 {
 748         int ret;
 749
 750         ret = scsi_verify_blk_ioctl(bd, cmd);
 751         if (ret < 0)
 752                 return ret;
 753
 754         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 755 }
 756 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 757
 758 static int __init blk_scsi_ioctl_init(void)
 759 {
 760         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 761         return 0;
 762 }
 763 fs_initcall(blk_scsi_ioctl_init);