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         /* Anybody who can open the device can do a read-safe command */
 209         if (test_bit(cmd[0], filter->read_ok))
 210                 return 0;
 211
 212         /* Write-safe commands require a writable open */
 213         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 214                 return 0;
 215
 216         return -EPERM;
 217 }
 218 EXPORT_SYMBOL(blk_verify_command);
 219
 220 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 221                              struct sg_io_hdr *hdr, fmode_t mode)
 222 {
 223         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 224                 return -EFAULT;
 225         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 226                 return -EPERM;
 227
 228         /*
 229          * fill in request structure
 230          */
 231         rq->cmd_len = hdr->cmd_len;
 232
 233         rq->timeout = msecs_to_jiffies(hdr->timeout);
 234         if (!rq->timeout)
 235                 rq->timeout = q->sg_timeout;
 236         if (!rq->timeout)
 237                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 238         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 239                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 240
 241         return 0;
 242 }
 243
 244 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 245                                  struct bio *bio)
 246 {
 247         int r, ret = 0;
 248
 249         /*
 250          * fill in all the output members
 251          */
 252         hdr->status = rq->errors & 0xff;
 253         hdr->masked_status = status_byte(rq->errors);
 254         hdr->msg_status = msg_byte(rq->errors);
 255         hdr->host_status = host_byte(rq->errors);
 256         hdr->driver_status = driver_byte(rq->errors);
 257         hdr->info = 0;
 258         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 259                 hdr->info |= SG_INFO_CHECK;
 260         hdr->resid = rq->resid_len;
 261         hdr->sb_len_wr = 0;
 262
 263         if (rq->sense_len && hdr->sbp) {
 264                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 265
 266                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 267                         hdr->sb_len_wr = len;
 268                 else
 269                         ret = -EFAULT;
 270         }
 271
 272         r = blk_rq_unmap_user(bio);
 273         if (!ret)
 274                 ret = r;
 275         blk_put_request(rq);
 276
 277         return ret;
 278 }
 279
 280 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 281                 struct sg_io_hdr *hdr, fmode_t mode)
 282 {
 283         unsigned long start_time;
 284         ssize_t ret = 0;
 285         int writing = 0;
 286         struct request *rq;
 287         char sense[SCSI_SENSE_BUFFERSIZE];
 288         struct bio *bio;
 289
 290         if (hdr->interface_id != 'S')
 291                 return -EINVAL;
 292         if (hdr->cmd_len > BLK_MAX_CDB)
 293                 return -EINVAL;
 294
 295         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 296                 return -EIO;
 297
 298         if (hdr->dxfer_len)
 299                 switch (hdr->dxfer_direction) {
 300                 default:
 301                         return -EINVAL;
 302                 case SG_DXFER_TO_DEV:
 303                         writing = 1;
 304                         break;
 305                 case SG_DXFER_TO_FROM_DEV:
 306                 case SG_DXFER_FROM_DEV:
 307                         break;
 308                 }
 309
 310         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 311         if (!rq)
 312                 return -ENOMEM;
 313         blk_rq_set_block_pc(rq);
 314
 315         if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 316                 blk_put_request(rq);
 317                 return -EFAULT;
 318         }
 319
 320         if (hdr->iovec_count) {
 321                 size_t iov_data_len;
 322                 struct iovec *iov = NULL;
 323
 324                 ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
 325                                             0, NULL, &iov);
 326                 if (ret < 0) {
 327                         kfree(iov);
 328                         goto out;
 329                 }
 330
 331                 iov_data_len = ret;
 332                 ret = 0;
 333
 334                 /* SG_IO howto says that the shorter of the two wins */
 335                 if (hdr->dxfer_len < iov_data_len) {
 336                         hdr->iovec_count = iov_shorten(iov,
 337                                                        hdr->iovec_count,
 338                                                        hdr->dxfer_len);
 339                         iov_data_len = hdr->dxfer_len;
 340                 }
 341
 342                 ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov,
 343                                           hdr->iovec_count,
 344                                           iov_data_len, GFP_KERNEL);
 345                 kfree(iov);
 346         } else if (hdr->dxfer_len)
 347                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 348                                       GFP_KERNEL);
 349
 350         if (ret)
 351                 goto out;
 352
 353         bio = rq->bio;
 354         memset(sense, 0, sizeof(sense));
 355         rq->sense = sense;
 356         rq->sense_len = 0;
 357         rq->retries = 0;
 358
 359         start_time = jiffies;
 360
 361         /* ignore return value. All information is passed back to caller
 362          * (if he doesn't check that is his problem).
 363          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 364          */
 365         blk_execute_rq(q, bd_disk, rq, 0);
 366
 367         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 368
 369         return blk_complete_sghdr_rq(rq, hdr, bio);
 370 out:
 371         blk_put_request(rq);
 372         return ret;
 373 }
 374
 375 /**
 376  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 377  * @file:       file this ioctl operates on (optional)
 378  * @q:          request queue to send scsi commands down
 379  * @disk:       gendisk to operate on (option)
 380  * @sic:        userspace structure describing the command to perform
 381  *
 382  * Send down the scsi command described by @sic to the device below
 383  * the request queue @q.  If @file is non-NULL it's used to perform
 384  * fine-grained permission checks that allow users to send down
 385  * non-destructive SCSI commands.  If the caller has a struct gendisk
 386  * available it should be passed in as @disk to allow the low level
 387  * driver to use the information contained in it.  A non-NULL @disk
 388  * is only allowed if the caller knows that the low level driver doesn't
 389  * need it (e.g. in the scsi subsystem).
 390  *
 391  * Notes:
 392  *   -  This interface is deprecated - users should use the SG_IO
 393  *      interface instead, as this is a more flexible approach to
 394  *      performing SCSI commands on a device.
 395  *   -  The SCSI command length is determined by examining the 1st byte
 396  *      of the given command. There is no way to override this.
 397  *   -  Data transfers are limited to PAGE_SIZE
 398  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 399  *      accommodate the sense buffer when an error occurs.
 400  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 401  *      old code will not be surprised.
 402  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 403  *      a negative return and the Unix error code in 'errno'.
 404  *      If the SCSI command succeeds then 0 is returned.
 405  *      Positive numbers returned are the compacted SCSI error codes (4
 406  *      bytes in one int) where the lowest byte is the SCSI status.
 407  */
 408 #define OMAX_SB_LEN 16          /* For backward compatibility */
 409 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 410                 struct scsi_ioctl_command __user *sic)
 411 {
 412         struct request *rq;
 413         int err;
 414         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 415         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 416
 417         if (!sic)
 418                 return -EINVAL;
 419
 420         /*
 421          * get in an out lengths, verify they don't exceed a page worth of data
 422          */
 423         if (get_user(in_len, &sic->inlen))
 424                 return -EFAULT;
 425         if (get_user(out_len, &sic->outlen))
 426                 return -EFAULT;
 427         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 428                 return -EINVAL;
 429         if (get_user(opcode, sic->data))
 430                 return -EFAULT;
 431
 432         bytes = max(in_len, out_len);
 433         if (bytes) {
 434                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 435                 if (!buffer)
 436                         return -ENOMEM;
 437
 438         }
 439
 440         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 441
 442         cmdlen = COMMAND_SIZE(opcode);
 443
 444         /*
 445          * get command and data to send to device, if any
 446          */
 447         err = -EFAULT;
 448         rq->cmd_len = cmdlen;
 449         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 450                 goto error;
 451
 452         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 453                 goto error;
 454
 455         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 456         if (err)
 457                 goto error;
 458
 459         /* default.  possible overriden later */
 460         rq->retries = 5;
 461
 462         switch (opcode) {
 463         case SEND_DIAGNOSTIC:
 464         case FORMAT_UNIT:
 465                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 466                 rq->retries = 1;
 467                 break;
 468         case START_STOP:
 469                 rq->timeout = START_STOP_TIMEOUT;
 470                 break;
 471         case MOVE_MEDIUM:
 472                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 473                 break;
 474         case READ_ELEMENT_STATUS:
 475                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 476                 break;
 477         case READ_DEFECT_DATA:
 478                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 479                 rq->retries = 1;
 480                 break;
 481         default:
 482                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 483                 break;
 484         }
 485
 486         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 487                 err = DRIVER_ERROR << 24;
 488                 goto out;
 489         }
 490
 491         memset(sense, 0, sizeof(sense));
 492         rq->sense = sense;
 493         rq->sense_len = 0;
 494         blk_rq_set_block_pc(rq);
 495
 496         blk_execute_rq(q, disk, rq, 0);
 497
 498 out:
 499         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 500         if (err) {
 501                 if (rq->sense_len && rq->sense) {
 502                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 503                                 rq->sense_len : OMAX_SB_LEN;
 504                         if (copy_to_user(sic->data, rq->sense, bytes))
 505                                 err = -EFAULT;
 506                 }
 507         } else {
 508                 if (copy_to_user(sic->data, buffer, out_len))
 509                         err = -EFAULT;
 510         }
 511
 512 error:
 513         kfree(buffer);
 514         blk_put_request(rq);
 515         return err;
 516 }
 517 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 518
 519 /* Send basic block requests */
 520 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 521                               int cmd, int data)
 522 {
 523         struct request *rq;
 524         int err;
 525
 526         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 527         blk_rq_set_block_pc(rq);
 528         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 529         rq->cmd[0] = cmd;
 530         rq->cmd[4] = data;
 531         rq->cmd_len = 6;
 532         err = blk_execute_rq(q, bd_disk, rq, 0);
 533         blk_put_request(rq);
 534
 535         return err;
 536 }
 537
 538 static inline int blk_send_start_stop(struct request_queue *q,
 539                                       struct gendisk *bd_disk, int data)
 540 {
 541         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 542 }
 543
 544 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 545                    unsigned int cmd, void __user *arg)
 546 {
 547         int err;
 548
 549         if (!q)
 550                 return -ENXIO;
 551
 552         switch (cmd) {
 553                 /*
 554                  * new sgv3 interface
 555                  */
 556                 case SG_GET_VERSION_NUM:
 557                         err = sg_get_version(arg);
 558                         break;
 559                 case SCSI_IOCTL_GET_IDLUN:
 560                         err = scsi_get_idlun(q, arg);
 561                         break;
 562                 case SCSI_IOCTL_GET_BUS_NUMBER:
 563                         err = scsi_get_bus(q, arg);
 564                         break;
 565                 case SG_SET_TIMEOUT:
 566                         err = sg_set_timeout(q, arg);
 567                         break;
 568                 case SG_GET_TIMEOUT:
 569                         err = sg_get_timeout(q);
 570                         break;
 571                 case SG_GET_RESERVED_SIZE:
 572                         err = sg_get_reserved_size(q, arg);
 573                         break;
 574                 case SG_SET_RESERVED_SIZE:
 575                         err = sg_set_reserved_size(q, arg);
 576                         break;
 577                 case SG_EMULATED_HOST:
 578                         err = sg_emulated_host(q, arg);
 579                         break;
 580                 case SG_IO: {
 581                         struct sg_io_hdr hdr;
 582
 583                         err = -EFAULT;
 584                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 585                                 break;
 586                         err = sg_io(q, bd_disk, &hdr, mode);
 587                         if (err == -EFAULT)
 588                                 break;
 589
 590                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 591                                 err = -EFAULT;
 592                         break;
 593                 }
 594                 case CDROM_SEND_PACKET: {
 595                         struct cdrom_generic_command cgc;
 596                         struct sg_io_hdr hdr;
 597
 598                         err = -EFAULT;
 599                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 600                                 break;
 601                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 602                         memset(&hdr, 0, sizeof(hdr));
 603                         hdr.interface_id = 'S';
 604                         hdr.cmd_len = sizeof(cgc.cmd);
 605                         hdr.dxfer_len = cgc.buflen;
 606                         err = 0;
 607                         switch (cgc.data_direction) {
 608                                 case CGC_DATA_UNKNOWN:
 609                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 610                                         break;
 611                                 case CGC_DATA_WRITE:
 612                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 613                                         break;
 614                                 case CGC_DATA_READ:
 615                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 616                                         break;
 617                                 case CGC_DATA_NONE:
 618                                         hdr.dxfer_direction = SG_DXFER_NONE;
 619                                         break;
 620                                 default:
 621                                         err = -EINVAL;
 622                         }
 623                         if (err)
 624                                 break;
 625
 626                         hdr.dxferp = cgc.buffer;
 627                         hdr.sbp = cgc.sense;
 628                         if (hdr.sbp)
 629                                 hdr.mx_sb_len = sizeof(struct request_sense);
 630                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 631                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 632                         hdr.cmd_len = sizeof(cgc.cmd);
 633
 634                         err = sg_io(q, bd_disk, &hdr, mode);
 635                         if (err == -EFAULT)
 636                                 break;
 637
 638                         if (hdr.status)
 639                                 err = -EIO;
 640
 641                         cgc.stat = err;
 642                         cgc.buflen = hdr.resid;
 643                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 644                                 err = -EFAULT;
 645
 646                         break;
 647                 }
 648
 649                 /*
 650                  * old junk scsi send command ioctl
 651                  */
 652                 case SCSI_IOCTL_SEND_COMMAND:
 653                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 654                         err = -EINVAL;
 655                         if (!arg)
 656                                 break;
 657
 658                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 659                         break;
 660                 case CDROMCLOSETRAY:
 661                         err = blk_send_start_stop(q, bd_disk, 0x03);
 662                         break;
 663                 case CDROMEJECT:
 664                         err = blk_send_start_stop(q, bd_disk, 0x02);
 665                         break;
 666                 default:
 667                         err = -ENOTTY;
 668         }
 669
 670         return err;
 671 }
 672 EXPORT_SYMBOL(scsi_cmd_ioctl);
 673
 674 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 675 {
 676         if (bd && bd == bd->bd_contains)
 677                 return 0;
 678
 679         /* Actually none of these is particularly useful on a partition,
 680          * but they are safe.
 681          */
 682         switch (cmd) {
 683         case SCSI_IOCTL_GET_IDLUN:
 684         case SCSI_IOCTL_GET_BUS_NUMBER:
 685         case SCSI_IOCTL_GET_PCI:
 686         case SCSI_IOCTL_PROBE_HOST:
 687         case SG_GET_VERSION_NUM:
 688         case SG_SET_TIMEOUT:
 689         case SG_GET_TIMEOUT:
 690         case SG_GET_RESERVED_SIZE:
 691         case SG_SET_RESERVED_SIZE:
 692         case SG_EMULATED_HOST:
 693                 return 0;
 694         case CDROM_GET_CAPABILITY:
 695                 /* Keep this until we remove the printk below.  udev sends it
 696                  * and we do not want to spam dmesg about it.   CD-ROMs do
 697                  * not have partitions, so we get here only for disks.
 698                  */
 699                 return -ENOIOCTLCMD;
 700         default:
 701                 break;
 702         }
 703
 704         if (capable(CAP_SYS_RAWIO))
 705                 return 0;
 706
 707         /* In particular, rule out all resets and host-specific ioctls.  */
 708         printk_ratelimited(KERN_WARNING
 709                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 710
 711         return -ENOIOCTLCMD;
 712 }
 713 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 714
 715 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 716                        unsigned int cmd, void __user *arg)
 717 {
 718         int ret;
 719
 720         ret = scsi_verify_blk_ioctl(bd, cmd);
 721         if (ret < 0)
 722                 return ret;
 723
 724         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 725 }
 726 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 727
 728 static int __init blk_scsi_ioctl_init(void)
 729 {
 730         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 731         return 0;
 732 }
 733 fs_initcall(blk_scsi_ioctl_init);