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/fd.h>
  31 #include <linux/raid/md_u.h>
  32 #include <linux/mtio.h>
  33 #include <asm/uaccess.h>
  34
  35 #include <scsi/scsi.h>
  36 #include <scsi/scsi_ioctl.h>
  37 #include <scsi/scsi_cmnd.h>
  38
  39 struct blk_cmd_filter {
  40         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  41         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  42 };
  43
  44 static struct blk_cmd_filter blk_default_cmd_filter;
  45
  46 /* Command group 3 is reserved and should never be used.  */
  47 const unsigned char scsi_command_size_tbl[8] =
  48 {
  49         6, 10, 10, 12,
  50         16, 12, 10, 10
  51 };
  52 EXPORT_SYMBOL(scsi_command_size_tbl);
  53
  54 #include <scsi/sg.h>
  55
  56 static int sg_get_version(int __user *p)
  57 {
  58         static const int sg_version_num = 30527;
  59         return put_user(sg_version_num, p);
  60 }
  61
  62 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  63 {
  64         return put_user(0, p);
  65 }
  66
  67 static int scsi_get_bus(struct request_queue *q, int __user *p)
  68 {
  69         return put_user(0, p);
  70 }
  71
  72 static int sg_get_timeout(struct request_queue *q)
  73 {
  74         return jiffies_to_clock_t(q->sg_timeout);
  75 }
  76
  77 static int sg_set_timeout(struct request_queue *q, int __user *p)
  78 {
  79         int timeout, err = get_user(timeout, p);
  80
  81         if (!err)
  82                 q->sg_timeout = clock_t_to_jiffies(timeout);
  83
  84         return err;
  85 }
  86
  87 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  88 {
  89         unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
  90
  91         return put_user(val, p);
  92 }
  93
  94 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
  95 {
  96         int size, err = get_user(size, p);
  97
  98         if (err)
  99                 return err;
 100
 101         if (size < 0)
 102                 return -EINVAL;
 103         if (size > (queue_max_sectors(q) << 9))
 104                 size = queue_max_sectors(q) << 9;
 105
 106         q->sg_reserved_size = size;
 107         return 0;
 108 }
 109
 110 /*
 111  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 112  * so sure this is worth doing anything about (why would you care??)
 113  */
 114 static int sg_emulated_host(struct request_queue *q, int __user *p)
 115 {
 116         return put_user(1, p);
 117 }
 118
 119 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 120 {
 121         /* Basic read-only commands */
 122         __set_bit(TEST_UNIT_READY, filter->read_ok);
 123         __set_bit(REQUEST_SENSE, filter->read_ok);
 124         __set_bit(READ_6, filter->read_ok);
 125         __set_bit(READ_10, filter->read_ok);
 126         __set_bit(READ_12, filter->read_ok);
 127         __set_bit(READ_16, filter->read_ok);
 128         __set_bit(READ_BUFFER, filter->read_ok);
 129         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 130         __set_bit(READ_CAPACITY, filter->read_ok);
 131         __set_bit(READ_LONG, filter->read_ok);
 132         __set_bit(INQUIRY, filter->read_ok);
 133         __set_bit(MODE_SENSE, filter->read_ok);
 134         __set_bit(MODE_SENSE_10, filter->read_ok);
 135         __set_bit(LOG_SENSE, filter->read_ok);
 136         __set_bit(START_STOP, filter->read_ok);
 137         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 138         __set_bit(VERIFY_16, filter->read_ok);
 139         __set_bit(REPORT_LUNS, filter->read_ok);
 140         __set_bit(SERVICE_ACTION_IN, filter->read_ok);
 141         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 142         __set_bit(MAINTENANCE_IN, filter->read_ok);
 143         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 144
 145         /* Audio CD commands */
 146         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 147         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 148         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 149         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 150         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 151
 152         /* CD/DVD data reading */
 153         __set_bit(GPCMD_READ_CD, filter->read_ok);
 154         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 155         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 156         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 157         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 158         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 159         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 160         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 161         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 162         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 163         __set_bit(GPCMD_SCAN, filter->read_ok);
 164         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 165         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 166         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 167         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 168         __set_bit(GPCMD_SEEK, filter->read_ok);
 169         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 170
 171         /* Basic writing commands */
 172         __set_bit(WRITE_6, filter->write_ok);
 173         __set_bit(WRITE_10, filter->write_ok);
 174         __set_bit(WRITE_VERIFY, filter->write_ok);
 175         __set_bit(WRITE_12, filter->write_ok);
 176         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 177         __set_bit(WRITE_16, filter->write_ok);
 178         __set_bit(WRITE_LONG, filter->write_ok);
 179         __set_bit(WRITE_LONG_2, filter->write_ok);
 180         __set_bit(ERASE, filter->write_ok);
 181         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 182         __set_bit(MODE_SELECT, filter->write_ok);
 183         __set_bit(LOG_SELECT, filter->write_ok);
 184         __set_bit(GPCMD_BLANK, filter->write_ok);
 185         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 186         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 187         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 188         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 189         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 190         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 191         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 192         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 193         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 194         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 195         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 196         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 197         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 198         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 199         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 200 }
 201
 202 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 203 {
 204         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 205
 206         /* root can do any command. */
 207         if (capable(CAP_SYS_RAWIO))
 208                 return 0;
 209
 210         /* if there's no filter set, assume we're filtering everything out */
 211         if (!filter)
 212                 return -EPERM;
 213
 214         /* Anybody who can open the device can do a read-safe command */
 215         if (test_bit(cmd[0], filter->read_ok))
 216                 return 0;
 217
 218         /* Write-safe commands require a writable open */
 219         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 220                 return 0;
 221
 222         return -EPERM;
 223 }
 224 EXPORT_SYMBOL(blk_verify_command);
 225
 226 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 227                              struct sg_io_hdr *hdr, fmode_t mode)
 228 {
 229         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 230                 return -EFAULT;
 231         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 232                 return -EPERM;
 233
 234         /*
 235          * fill in request structure
 236          */
 237         rq->cmd_len = hdr->cmd_len;
 238         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 239
 240         rq->timeout = msecs_to_jiffies(hdr->timeout);
 241         if (!rq->timeout)
 242                 rq->timeout = q->sg_timeout;
 243         if (!rq->timeout)
 244                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 245         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 246                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 247
 248         return 0;
 249 }
 250
 251 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 252                                  struct bio *bio)
 253 {
 254         int r, ret = 0;
 255
 256         /*
 257          * fill in all the output members
 258          */
 259         hdr->status = rq->errors & 0xff;
 260         hdr->masked_status = status_byte(rq->errors);
 261         hdr->msg_status = msg_byte(rq->errors);
 262         hdr->host_status = host_byte(rq->errors);
 263         hdr->driver_status = driver_byte(rq->errors);
 264         hdr->info = 0;
 265         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 266                 hdr->info |= SG_INFO_CHECK;
 267         hdr->resid = rq->resid_len;
 268         hdr->sb_len_wr = 0;
 269
 270         if (rq->sense_len && hdr->sbp) {
 271                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 272
 273                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 274                         hdr->sb_len_wr = len;
 275                 else
 276                         ret = -EFAULT;
 277         }
 278
 279         r = blk_rq_unmap_user(bio);
 280         if (!ret)
 281                 ret = r;
 282         blk_put_request(rq);
 283
 284         return ret;
 285 }
 286
 287 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 288                 struct sg_io_hdr *hdr, fmode_t mode)
 289 {
 290         unsigned long start_time;
 291         int writing = 0, ret = 0;
 292         struct request *rq;
 293         char sense[SCSI_SENSE_BUFFERSIZE];
 294         struct bio *bio;
 295
 296         if (hdr->interface_id != 'S')
 297                 return -EINVAL;
 298         if (hdr->cmd_len > BLK_MAX_CDB)
 299                 return -EINVAL;
 300
 301         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 302                 return -EIO;
 303
 304         if (hdr->dxfer_len)
 305                 switch (hdr->dxfer_direction) {
 306                 default:
 307                         return -EINVAL;
 308                 case SG_DXFER_TO_DEV:
 309                         writing = 1;
 310                         break;
 311                 case SG_DXFER_TO_FROM_DEV:
 312                 case SG_DXFER_FROM_DEV:
 313                         break;
 314                 }
 315
 316         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 317         if (!rq)
 318                 return -ENOMEM;
 319
 320         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 321                 blk_put_request(rq);
 322                 return -EFAULT;
 323         }
 324
 325         if (hdr->iovec_count) {
 326                 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 327                 size_t iov_data_len;
 328                 struct sg_iovec *sg_iov;
 329                 struct iovec *iov;
 330                 int i;
 331
 332                 sg_iov = kmalloc(size, GFP_KERNEL);
 333                 if (!sg_iov) {
 334                         ret = -ENOMEM;
 335                         goto out;
 336                 }
 337
 338                 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
 339                         kfree(sg_iov);
 340                         ret = -EFAULT;
 341                         goto out;
 342                 }
 343
 344                 /*
 345                  * Sum up the vecs, making sure they don't overflow
 346                  */
 347                 iov = (struct iovec *) sg_iov;
 348                 iov_data_len = 0;
 349                 for (i = 0; i < hdr->iovec_count; i++) {
 350                         if (iov_data_len + iov[i].iov_len < iov_data_len) {
 351                                 kfree(sg_iov);
 352                                 ret = -EINVAL;
 353                                 goto out;
 354                         }
 355                         iov_data_len += iov[i].iov_len;
 356                 }
 357
 358                 /* SG_IO howto says that the shorter of the two wins */
 359                 if (hdr->dxfer_len < iov_data_len) {
 360                         hdr->iovec_count = iov_shorten(iov,
 361                                                        hdr->iovec_count,
 362                                                        hdr->dxfer_len);
 363                         iov_data_len = hdr->dxfer_len;
 364                 }
 365
 366                 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
 367                                           iov_data_len, GFP_KERNEL);
 368                 kfree(sg_iov);
 369         } else if (hdr->dxfer_len)
 370                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 371                                       GFP_KERNEL);
 372
 373         if (ret)
 374                 goto out;
 375
 376         bio = rq->bio;
 377         memset(sense, 0, sizeof(sense));
 378         rq->sense = sense;
 379         rq->sense_len = 0;
 380         rq->retries = 0;
 381
 382         start_time = jiffies;
 383
 384         /* ignore return value. All information is passed back to caller
 385          * (if he doesn't check that is his problem).
 386          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 387          */
 388         blk_execute_rq(q, bd_disk, rq, 0);
 389
 390         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 391
 392         return blk_complete_sghdr_rq(rq, hdr, bio);
 393 out:
 394         blk_put_request(rq);
 395         return ret;
 396 }
 397
 398 /**
 399  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 400  * @file:       file this ioctl operates on (optional)
 401  * @q:          request queue to send scsi commands down
 402  * @disk:       gendisk to operate on (option)
 403  * @sic:        userspace structure describing the command to perform
 404  *
 405  * Send down the scsi command described by @sic to the device below
 406  * the request queue @q.  If @file is non-NULL it's used to perform
 407  * fine-grained permission checks that allow users to send down
 408  * non-destructive SCSI commands.  If the caller has a struct gendisk
 409  * available it should be passed in as @disk to allow the low level
 410  * driver to use the information contained in it.  A non-NULL @disk
 411  * is only allowed if the caller knows that the low level driver doesn't
 412  * need it (e.g. in the scsi subsystem).
 413  *
 414  * Notes:
 415  *   -  This interface is deprecated - users should use the SG_IO
 416  *      interface instead, as this is a more flexible approach to
 417  *      performing SCSI commands on a device.
 418  *   -  The SCSI command length is determined by examining the 1st byte
 419  *      of the given command. There is no way to override this.
 420  *   -  Data transfers are limited to PAGE_SIZE
 421  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 422  *      accommodate the sense buffer when an error occurs.
 423  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 424  *      old code will not be surprised.
 425  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 426  *      a negative return and the Unix error code in 'errno'.
 427  *      If the SCSI command succeeds then 0 is returned.
 428  *      Positive numbers returned are the compacted SCSI error codes (4
 429  *      bytes in one int) where the lowest byte is the SCSI status.
 430  */
 431 #define OMAX_SB_LEN 16          /* For backward compatibility */
 432 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 433                 struct scsi_ioctl_command __user *sic)
 434 {
 435         struct request *rq;
 436         int err;
 437         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 438         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 439
 440         if (!sic)
 441                 return -EINVAL;
 442
 443         /*
 444          * get in an out lengths, verify they don't exceed a page worth of data
 445          */
 446         if (get_user(in_len, &sic->inlen))
 447                 return -EFAULT;
 448         if (get_user(out_len, &sic->outlen))
 449                 return -EFAULT;
 450         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 451                 return -EINVAL;
 452         if (get_user(opcode, sic->data))
 453                 return -EFAULT;
 454
 455         bytes = max(in_len, out_len);
 456         if (bytes) {
 457                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 458                 if (!buffer)
 459                         return -ENOMEM;
 460
 461         }
 462
 463         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 464
 465         cmdlen = COMMAND_SIZE(opcode);
 466
 467         /*
 468          * get command and data to send to device, if any
 469          */
 470         err = -EFAULT;
 471         rq->cmd_len = cmdlen;
 472         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 473                 goto error;
 474
 475         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 476                 goto error;
 477
 478         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 479         if (err)
 480                 goto error;
 481
 482         /* default.  possible overriden later */
 483         rq->retries = 5;
 484
 485         switch (opcode) {
 486         case SEND_DIAGNOSTIC:
 487         case FORMAT_UNIT:
 488                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 489                 rq->retries = 1;
 490                 break;
 491         case START_STOP:
 492                 rq->timeout = START_STOP_TIMEOUT;
 493                 break;
 494         case MOVE_MEDIUM:
 495                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 496                 break;
 497         case READ_ELEMENT_STATUS:
 498                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 499                 break;
 500         case READ_DEFECT_DATA:
 501                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 502                 rq->retries = 1;
 503                 break;
 504         default:
 505                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 506                 break;
 507         }
 508
 509         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 510                 err = DRIVER_ERROR << 24;
 511                 goto out;
 512         }
 513
 514         memset(sense, 0, sizeof(sense));
 515         rq->sense = sense;
 516         rq->sense_len = 0;
 517         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 518
 519         blk_execute_rq(q, disk, rq, 0);
 520
 521 out:
 522         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 523         if (err) {
 524                 if (rq->sense_len && rq->sense) {
 525                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 526                                 rq->sense_len : OMAX_SB_LEN;
 527                         if (copy_to_user(sic->data, rq->sense, bytes))
 528                                 err = -EFAULT;
 529                 }
 530         } else {
 531                 if (copy_to_user(sic->data, buffer, out_len))
 532                         err = -EFAULT;
 533         }
 534
 535 error:
 536         kfree(buffer);
 537         blk_put_request(rq);
 538         return err;
 539 }
 540 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 541
 542 /* Send basic block requests */
 543 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 544                               int cmd, int data)
 545 {
 546         struct request *rq;
 547         int err;
 548
 549         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 550         rq->cmd_type = REQ_TYPE_BLOCK_PC;
 551         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 552         rq->cmd[0] = cmd;
 553         rq->cmd[4] = data;
 554         rq->cmd_len = 6;
 555         err = blk_execute_rq(q, bd_disk, rq, 0);
 556         blk_put_request(rq);
 557
 558         return err;
 559 }
 560
 561 static inline int blk_send_start_stop(struct request_queue *q,
 562                                       struct gendisk *bd_disk, int data)
 563 {
 564         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 565 }
 566
 567 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 568                    unsigned int cmd, void __user *arg)
 569 {
 570         int err;
 571
 572         if (!q)
 573                 return -ENXIO;
 574
 575         switch (cmd) {
 576                 /*
 577                  * new sgv3 interface
 578                  */
 579                 case SG_GET_VERSION_NUM:
 580                         err = sg_get_version(arg);
 581                         break;
 582                 case SCSI_IOCTL_GET_IDLUN:
 583                         err = scsi_get_idlun(q, arg);
 584                         break;
 585                 case SCSI_IOCTL_GET_BUS_NUMBER:
 586                         err = scsi_get_bus(q, arg);
 587                         break;
 588                 case SG_SET_TIMEOUT:
 589                         err = sg_set_timeout(q, arg);
 590                         break;
 591                 case SG_GET_TIMEOUT:
 592                         err = sg_get_timeout(q);
 593                         break;
 594                 case SG_GET_RESERVED_SIZE:
 595                         err = sg_get_reserved_size(q, arg);
 596                         break;
 597                 case SG_SET_RESERVED_SIZE:
 598                         err = sg_set_reserved_size(q, arg);
 599                         break;
 600                 case SG_EMULATED_HOST:
 601                         err = sg_emulated_host(q, arg);
 602                         break;
 603                 case SG_IO: {
 604                         struct sg_io_hdr hdr;
 605
 606                         err = -EFAULT;
 607                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 608                                 break;
 609                         err = sg_io(q, bd_disk, &hdr, mode);
 610                         if (err == -EFAULT)
 611                                 break;
 612
 613                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 614                                 err = -EFAULT;
 615                         break;
 616                 }
 617                 case CDROM_SEND_PACKET: {
 618                         struct cdrom_generic_command cgc;
 619                         struct sg_io_hdr hdr;
 620
 621                         err = -EFAULT;
 622                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 623                                 break;
 624                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 625                         memset(&hdr, 0, sizeof(hdr));
 626                         hdr.interface_id = 'S';
 627                         hdr.cmd_len = sizeof(cgc.cmd);
 628                         hdr.dxfer_len = cgc.buflen;
 629                         err = 0;
 630                         switch (cgc.data_direction) {
 631                                 case CGC_DATA_UNKNOWN:
 632                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 633                                         break;
 634                                 case CGC_DATA_WRITE:
 635                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 636                                         break;
 637                                 case CGC_DATA_READ:
 638                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 639                                         break;
 640                                 case CGC_DATA_NONE:
 641                                         hdr.dxfer_direction = SG_DXFER_NONE;
 642                                         break;
 643                                 default:
 644                                         err = -EINVAL;
 645                         }
 646                         if (err)
 647                                 break;
 648
 649                         hdr.dxferp = cgc.buffer;
 650                         hdr.sbp = cgc.sense;
 651                         if (hdr.sbp)
 652                                 hdr.mx_sb_len = sizeof(struct request_sense);
 653                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 654                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 655                         hdr.cmd_len = sizeof(cgc.cmd);
 656
 657                         err = sg_io(q, bd_disk, &hdr, mode);
 658                         if (err == -EFAULT)
 659                                 break;
 660
 661                         if (hdr.status)
 662                                 err = -EIO;
 663
 664                         cgc.stat = err;
 665                         cgc.buflen = hdr.resid;
 666                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 667                                 err = -EFAULT;
 668
 669                         break;
 670                 }
 671
 672                 /*
 673                  * old junk scsi send command ioctl
 674                  */
 675                 case SCSI_IOCTL_SEND_COMMAND:
 676                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 677                         err = -EINVAL;
 678                         if (!arg)
 679                                 break;
 680
 681                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 682                         break;
 683                 case CDROMCLOSETRAY:
 684                         err = blk_send_start_stop(q, bd_disk, 0x03);
 685                         break;
 686                 case CDROMEJECT:
 687                         err = blk_send_start_stop(q, bd_disk, 0x02);
 688                         break;
 689                 default:
 690                         err = -ENOTTY;
 691         }
 692
 693         return err;
 694 }
 695 EXPORT_SYMBOL(scsi_cmd_ioctl);
 696
 697 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 698 {
 699         if (bd && bd == bd->bd_contains)
 700                 return 0;
 701
 702         /* Actually none of these is particularly useful on a partition,
 703          * but they are safe.
 704          */
 705         switch (cmd) {
 706         case SCSI_IOCTL_GET_IDLUN:
 707         case SCSI_IOCTL_GET_BUS_NUMBER:
 708         case SCSI_IOCTL_GET_PCI:
 709         case SCSI_IOCTL_PROBE_HOST:
 710         case SG_GET_VERSION_NUM:
 711         case SG_SET_TIMEOUT:
 712         case SG_GET_TIMEOUT:
 713         case SG_GET_RESERVED_SIZE:
 714         case SG_SET_RESERVED_SIZE:
 715         case SG_EMULATED_HOST:
 716         case BLKFLSBUF:
 717         case BLKROSET:
 718                 return 0;
 719         case CDROM_GET_CAPABILITY:
 720         case CDROM_DRIVE_STATUS:
 721         case FDGETPRM:
 722         case RAID_VERSION:
 723         case MTIOCGET:
 724 #ifdef CONFIG_COMPAT
 725         case 0x801c6d02:        /* MTIOCGET32 */
 726 #endif
 727                 /* Keep this until we remove the printk below.  udev sends it
 728                  * and we do not want to spam dmesg about it.   CD-ROMs do
 729                  * not have partitions, so we get here only for disks.
 730                  */
 731                 return -ENOTTY;
 732         default:
 733                 break;
 734         }
 735
 736         /* In particular, rule out all resets and host-specific ioctls.  */
 737         printk_ratelimited(KERN_WARNING
 738                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 739
 740         return capable(CAP_SYS_RAWIO) ? 0 : -ENOTTY;
 741 }
 742 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 743
 744 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 745                        unsigned int cmd, void __user *arg)
 746 {
 747         int ret;
 748
 749         ret = scsi_verify_blk_ioctl(bd, cmd);
 750         if (ret < 0)
 751                 return ret;
 752
 753         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 754 }
 755 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 756
 757 static int __init blk_scsi_ioctl_init(void)
 758 {
 759         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 760         return 0;
 761 }
 762 fs_initcall(blk_scsi_ioctl_init);