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 <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
  37struct 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
  42static struct blk_cmd_filter blk_default_cmd_filter;
  43
  44/* Command group 3 is reserved and should never be used.  */
  45const unsigned char scsi_command_size_tbl[8] =
  46{
  47        6, 10, 10, 12,
  48        16, 12, 10, 10
  49};
  50EXPORT_SYMBOL(scsi_command_size_tbl);
  51
  52#include <scsi/sg.h>
  53
  54static 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
  60static int scsi_get_idlun(struct request_queue *q, int __user *p)
  61{
  62        return put_user(0, p);
  63}
  64
  65static int scsi_get_bus(struct request_queue *q, int __user *p)
  66{
  67        return put_user(0, p);
  68}
  69
  70static int sg_get_timeout(struct request_queue *q)
  71{
  72        return jiffies_to_clock_t(q->sg_timeout);
  73}
  74
  75static 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
  85static 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
  92static 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 */
 112static int sg_emulated_host(struct request_queue *q, int __user *p)
 113{
 114        return put_user(1, p);
 115}
 116
 117static 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(WRITE_SAME, filter->write_ok);
 179        __set_bit(WRITE_SAME_16, filter->write_ok);
 180        __set_bit(WRITE_SAME_32, filter->write_ok);
 181        __set_bit(ERASE, filter->write_ok);
 182        __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 183        __set_bit(MODE_SELECT, filter->write_ok);
 184        __set_bit(LOG_SELECT, filter->write_ok);
 185        __set_bit(GPCMD_BLANK, filter->write_ok);
 186        __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 187        __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 188        __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 189        __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 190        __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 191        __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 192        __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 193        __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 194        __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 195        __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 196        __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 197        __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 198        __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 199        __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 200        __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 201}
 202
 203int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 204{
 205        struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 206
 207        /* root can do any command. */
 208        if (capable(CAP_SYS_RAWIO))
 209                return 0;
 210
 211        /* if there's no filter set, assume we're filtering everything out */
 212        if (!filter)
 213                return -EPERM;
 214
 215        /* Anybody who can open the device can do a read-safe command */
 216        if (test_bit(cmd[0], filter->read_ok))
 217                return 0;
 218
 219        /* Write-safe commands require a writable open */
 220        if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 221                return 0;
 222
 223        return -EPERM;
 224}
 225EXPORT_SYMBOL(blk_verify_command);
 226
 227static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 228                             struct sg_io_hdr *hdr, fmode_t mode)
 229{
 230        if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 231                return -EFAULT;
 232        if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 233                return -EPERM;
 234
 235        /*
 236         * fill in request structure
 237         */
 238        rq->cmd_len = hdr->cmd_len;
 239        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 240
 241        rq->timeout = msecs_to_jiffies(hdr->timeout);
 242        if (!rq->timeout)
 243                rq->timeout = q->sg_timeout;
 244        if (!rq->timeout)
 245                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 246        if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 247                rq->timeout = BLK_MIN_SG_TIMEOUT;
 248
 249        return 0;
 250}
 251
 252static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 253                                 struct bio *bio)
 254{
 255        int r, ret = 0;
 256
 257        /*
 258         * fill in all the output members
 259         */
 260        hdr->status = rq->errors & 0xff;
 261        hdr->masked_status = status_byte(rq->errors);
 262        hdr->msg_status = msg_byte(rq->errors);
 263        hdr->host_status = host_byte(rq->errors);
 264        hdr->driver_status = driver_byte(rq->errors);
 265        hdr->info = 0;
 266        if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 267                hdr->info |= SG_INFO_CHECK;
 268        hdr->resid = rq->resid_len;
 269        hdr->sb_len_wr = 0;
 270
 271        if (rq->sense_len && hdr->sbp) {
 272                int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 273
 274                if (!copy_to_user(hdr->sbp, rq->sense, len))
 275                        hdr->sb_len_wr = len;
 276                else
 277                        ret = -EFAULT;
 278        }
 279
 280        r = blk_rq_unmap_user(bio);
 281        if (!ret)
 282                ret = r;
 283        blk_put_request(rq);
 284
 285        return ret;
 286}
 287
 288static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 289                struct sg_io_hdr *hdr, fmode_t mode)
 290{
 291        unsigned long start_time;
 292        int writing = 0, ret = 0;
 293        struct request *rq;
 294        char sense[SCSI_SENSE_BUFFERSIZE];
 295        struct bio *bio;
 296
 297        if (hdr->interface_id != 'S')
 298                return -EINVAL;
 299        if (hdr->cmd_len > BLK_MAX_CDB)
 300                return -EINVAL;
 301
 302        if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 303                return -EIO;
 304
 305        if (hdr->dxfer_len)
 306                switch (hdr->dxfer_direction) {
 307                default:
 308                        return -EINVAL;
 309                case SG_DXFER_TO_DEV:
 310                        writing = 1;
 311                        break;
 312                case SG_DXFER_TO_FROM_DEV:
 313                case SG_DXFER_FROM_DEV:
 314                        break;
 315                }
 316
 317        rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 318        if (!rq)
 319                return -ENOMEM;
 320
 321        if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 322                blk_put_request(rq);
 323                return -EFAULT;
 324        }
 325
 326        if (hdr->iovec_count) {
 327                const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 328                size_t iov_data_len;
 329                struct sg_iovec *sg_iov;
 330                struct iovec *iov;
 331                int i;
 332
 333                sg_iov = kmalloc(size, GFP_KERNEL);
 334                if (!sg_iov) {
 335                        ret = -ENOMEM;
 336                        goto out;
 337                }
 338
 339                if (copy_from_user(sg_iov, hdr->dxferp, size)) {
 340                        kfree(sg_iov);
 341                        ret = -EFAULT;
 342                        goto out;
 343                }
 344
 345                /*
 346                 * Sum up the vecs, making sure they don't overflow
 347                 */
 348                iov = (struct iovec *) sg_iov;
 349                iov_data_len = 0;
 350                for (i = 0; i < hdr->iovec_count; i++) {
 351                        if (iov_data_len + iov[i].iov_len < iov_data_len) {
 352                                kfree(sg_iov);
 353                                ret = -EINVAL;
 354                                goto out;
 355                        }
 356                        iov_data_len += iov[i].iov_len;
 357                }
 358
 359                /* SG_IO howto says that the shorter of the two wins */
 360                if (hdr->dxfer_len < iov_data_len) {
 361                        hdr->iovec_count = iov_shorten(iov,
 362                                                       hdr->iovec_count,
 363                                                       hdr->dxfer_len);
 364                        iov_data_len = hdr->dxfer_len;
 365                }
 366
 367                ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
 368                                          iov_data_len, GFP_KERNEL);
 369                kfree(sg_iov);
 370        } else if (hdr->dxfer_len)
 371                ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 372                                      GFP_KERNEL);
 373
 374        if (ret)
 375                goto out;
 376
 377        bio = rq->bio;
 378        memset(sense, 0, sizeof(sense));
 379        rq->sense = sense;
 380        rq->sense_len = 0;
 381        rq->retries = 0;
 382
 383        start_time = jiffies;
 384
 385        /* ignore return value. All information is passed back to caller
 386         * (if he doesn't check that is his problem).
 387         * N.B. a non-zero SCSI status is _not_ necessarily an error.
 388         */
 389        blk_execute_rq(q, bd_disk, rq, 0);
 390
 391        hdr->duration = jiffies_to_msecs(jiffies - start_time);
 392
 393        return blk_complete_sghdr_rq(rq, hdr, bio);
 394out:
 395        blk_put_request(rq);
 396        return ret;
 397}
 398
 399/**
 400 * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 401 * @file:       file this ioctl operates on (optional)
 402 * @q:          request queue to send scsi commands down
 403 * @disk:       gendisk to operate on (option)
 404 * @sic:        userspace structure describing the command to perform
 405 *
 406 * Send down the scsi command described by @sic to the device below
 407 * the request queue @q.  If @file is non-NULL it's used to perform
 408 * fine-grained permission checks that allow users to send down
 409 * non-destructive SCSI commands.  If the caller has a struct gendisk
 410 * available it should be passed in as @disk to allow the low level
 411 * driver to use the information contained in it.  A non-NULL @disk
 412 * is only allowed if the caller knows that the low level driver doesn't
 413 * need it (e.g. in the scsi subsystem).
 414 *
 415 * Notes:
 416 *   -  This interface is deprecated - users should use the SG_IO
 417 *      interface instead, as this is a more flexible approach to
 418 *      performing SCSI commands on a device.
 419 *   -  The SCSI command length is determined by examining the 1st byte
 420 *      of the given command. There is no way to override this.
 421 *   -  Data transfers are limited to PAGE_SIZE
 422 *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 423 *      accommodate the sense buffer when an error occurs.
 424 *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 425 *      old code will not be surprised.
 426 *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 427 *      a negative return and the Unix error code in 'errno'.
 428 *      If the SCSI command succeeds then 0 is returned.
 429 *      Positive numbers returned are the compacted SCSI error codes (4
 430 *      bytes in one int) where the lowest byte is the SCSI status.
 431 */
 432#define OMAX_SB_LEN 16          /* For backward compatibility */
 433int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 434                struct scsi_ioctl_command __user *sic)
 435{
 436        struct request *rq;
 437        int err;
 438        unsigned int in_len, out_len, bytes, opcode, cmdlen;
 439        char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 440
 441        if (!sic)
 442                return -EINVAL;
 443
 444        /*
 445         * get in an out lengths, verify they don't exceed a page worth of data
 446         */
 447        if (get_user(in_len, &sic->inlen))
 448                return -EFAULT;
 449        if (get_user(out_len, &sic->outlen))
 450                return -EFAULT;
 451        if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 452                return -EINVAL;
 453        if (get_user(opcode, sic->data))
 454                return -EFAULT;
 455
 456        bytes = max(in_len, out_len);
 457        if (bytes) {
 458                buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 459                if (!buffer)
 460                        return -ENOMEM;
 461
 462        }
 463
 464        rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 465
 466        cmdlen = COMMAND_SIZE(opcode);
 467
 468        /*
 469         * get command and data to send to device, if any
 470         */
 471        err = -EFAULT;
 472        rq->cmd_len = cmdlen;
 473        if (copy_from_user(rq->cmd, sic->data, cmdlen))
 474                goto error;
 475
 476        if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 477                goto error;
 478
 479        err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 480        if (err)
 481                goto error;
 482
 483        /* default.  possible overriden later */
 484        rq->retries = 5;
 485
 486        switch (opcode) {
 487        case SEND_DIAGNOSTIC:
 488        case FORMAT_UNIT:
 489                rq->timeout = FORMAT_UNIT_TIMEOUT;
 490                rq->retries = 1;
 491                break;
 492        case START_STOP:
 493                rq->timeout = START_STOP_TIMEOUT;
 494                break;
 495        case MOVE_MEDIUM:
 496                rq->timeout = MOVE_MEDIUM_TIMEOUT;
 497                break;
 498        case READ_ELEMENT_STATUS:
 499                rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 500                break;
 501        case READ_DEFECT_DATA:
 502                rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 503                rq->retries = 1;
 504                break;
 505        default:
 506                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 507                break;
 508        }
 509
 510        if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 511                err = DRIVER_ERROR << 24;
 512                goto error;
 513        }
 514
 515        memset(sense, 0, sizeof(sense));
 516        rq->sense = sense;
 517        rq->sense_len = 0;
 518        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 519
 520        blk_execute_rq(q, disk, rq, 0);
 521
 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        
 535error:
 536        kfree(buffer);
 537        blk_put_request(rq);
 538        return err;
 539}
 540EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 541
 542/* Send basic block requests */
 543static 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
 561static 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
 567int 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}
 695EXPORT_SYMBOL(scsi_cmd_ioctl);
 696
 697int 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                return 0;
 717        case CDROM_GET_CAPABILITY:
 718                /* Keep this until we remove the printk below.  udev sends it
 719                 * and we do not want to spam dmesg about it.   CD-ROMs do
 720                 * not have partitions, so we get here only for disks.
 721                 */
 722                return -ENOIOCTLCMD;
 723        default:
 724                break;
 725        }
 726
 727        if (capable(CAP_SYS_RAWIO))
 728                return 0;
 729
 730        /* In particular, rule out all resets and host-specific ioctls.  */
 731        printk_ratelimited(KERN_WARNING
 732                           "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 733
 734        return -ENOIOCTLCMD;
 735}
 736EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 737
 738int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 739                       unsigned int cmd, void __user *arg)
 740{
 741        int ret;
 742
 743        ret = scsi_verify_blk_ioctl(bd, cmd);
 744        if (ret < 0)
 745                return ret;
 746
 747        return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 748}
 749EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 750
 751static int __init blk_scsi_ioctl_init(void)
 752{
 753        blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 754        return 0;
 755}
 756fs_initcall(blk_scsi_ioctl_init);
 757