linux/block/scsi_ioctl.c
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   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
  36struct 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
  41static struct blk_cmd_filter blk_default_cmd_filter;
  42
  43/* Command group 3 is reserved and should never be used.  */
  44const unsigned char scsi_command_size_tbl[8] =
  45{
  46        6, 10, 10, 12,
  47        16, 12, 10, 10
  48};
  49EXPORT_SYMBOL(scsi_command_size_tbl);
  50
  51#include <scsi/sg.h>
  52
  53static 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
  59static int scsi_get_idlun(struct request_queue *q, int __user *p)
  60{
  61        return put_user(0, p);
  62}
  63
  64static int scsi_get_bus(struct request_queue *q, int __user *p)
  65{
  66        return put_user(0, p);
  67}
  68
  69static int sg_get_timeout(struct request_queue *q)
  70{
  71        return jiffies_to_clock_t(q->sg_timeout);
  72}
  73
  74static 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
  84static 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
  91static 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 */
 111static int sg_emulated_host(struct request_queue *q, int __user *p)
 112{
 113        return put_user(1, p);
 114}
 115
 116static 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
 199int 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}
 221EXPORT_SYMBOL(blk_verify_command);
 222
 223static 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
 248static 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
 284static 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);
 390out:
 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 */
 429int 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
 518out:
 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        
 532error:
 533        kfree(buffer);
 534        blk_put_request(rq);
 535        return err;
 536}
 537EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 538
 539/* Send basic block requests */
 540static 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
 558static 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
 564int 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}
 692EXPORT_SYMBOL(scsi_cmd_ioctl);
 693
 694int 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        if (capable(CAP_SYS_RAWIO))
 725                return 0;
 726
 727        /* In particular, rule out all resets and host-specific ioctls.  */
 728        printk_ratelimited(KERN_WARNING
 729                           "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 730
 731        return -ENOIOCTLCMD;
 732}
 733EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 734
 735int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 736                       unsigned int cmd, void __user *arg)
 737{
 738        int ret;
 739
 740        ret = scsi_verify_blk_ioctl(bd, cmd);
 741        if (ret < 0)
 742                return ret;
 743
 744        return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 745}
 746EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 747
 748static int __init blk_scsi_ioctl_init(void)
 749{
 750        blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 751        return 0;
 752}
 753fs_initcall(blk_scsi_ioctl_init);
 754
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