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