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(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
 200int 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        /* if there's no filter set, assume we're filtering everything out */
 209        if (!filter)
 210                return -EPERM;
 211
 212        /* Anybody who can open the device can do a read-safe command */
 213        if (test_bit(cmd[0], filter->read_ok))
 214                return 0;
 215
 216        /* Write-safe commands require a writable open */
 217        if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 218                return 0;
 219
 220        return -EPERM;
 221}
 222EXPORT_SYMBOL(blk_verify_command);
 223
 224static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 225                             struct sg_io_hdr *hdr, fmode_t mode)
 226{
 227        if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 228                return -EFAULT;
 229        if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 230                return -EPERM;
 231
 232        /*
 233         * fill in request structure
 234         */
 235        rq->cmd_len = hdr->cmd_len;
 236        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 237
 238        rq->timeout = msecs_to_jiffies(hdr->timeout);
 239        if (!rq->timeout)
 240                rq->timeout = q->sg_timeout;
 241        if (!rq->timeout)
 242                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 243        if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 244                rq->timeout = BLK_MIN_SG_TIMEOUT;
 245
 246        return 0;
 247}
 248
 249static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 250                                 struct bio *bio)
 251{
 252        int r, ret = 0;
 253
 254        /*
 255         * fill in all the output members
 256         */
 257        hdr->status = rq->errors & 0xff;
 258        hdr->masked_status = status_byte(rq->errors);
 259        hdr->msg_status = msg_byte(rq->errors);
 260        hdr->host_status = host_byte(rq->errors);
 261        hdr->driver_status = driver_byte(rq->errors);
 262        hdr->info = 0;
 263        if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 264                hdr->info |= SG_INFO_CHECK;
 265        hdr->resid = rq->resid_len;
 266        hdr->sb_len_wr = 0;
 267
 268        if (rq->sense_len && hdr->sbp) {
 269                int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 270
 271                if (!copy_to_user(hdr->sbp, rq->sense, len))
 272                        hdr->sb_len_wr = len;
 273                else
 274                        ret = -EFAULT;
 275        }
 276
 277        r = blk_rq_unmap_user(bio);
 278        if (!ret)
 279                ret = r;
 280        blk_put_request(rq);
 281
 282        return ret;
 283}
 284
 285static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 286                struct sg_io_hdr *hdr, fmode_t mode)
 287{
 288        unsigned long start_time;
 289        int writing = 0, ret = 0;
 290        struct request *rq;
 291        char sense[SCSI_SENSE_BUFFERSIZE];
 292        struct bio *bio;
 293
 294        if (hdr->interface_id != 'S')
 295                return -EINVAL;
 296        if (hdr->cmd_len > BLK_MAX_CDB)
 297                return -EINVAL;
 298
 299        if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 300                return -EIO;
 301
 302        if (hdr->dxfer_len)
 303                switch (hdr->dxfer_direction) {
 304                default:
 305                        return -EINVAL;
 306                case SG_DXFER_TO_DEV:
 307                        writing = 1;
 308                        break;
 309                case SG_DXFER_TO_FROM_DEV:
 310                case SG_DXFER_FROM_DEV:
 311                        break;
 312                }
 313
 314        rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 315        if (!rq)
 316                return -ENOMEM;
 317
 318        if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
 319                blk_put_request(rq);
 320                return -EFAULT;
 321        }
 322
 323        if (hdr->iovec_count) {
 324                const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
 325                size_t iov_data_len;
 326                struct sg_iovec *sg_iov;
 327                struct iovec *iov;
 328                int i;
 329
 330                sg_iov = kmalloc(size, GFP_KERNEL);
 331                if (!sg_iov) {
 332                        ret = -ENOMEM;
 333                        goto out;
 334                }
 335
 336                if (copy_from_user(sg_iov, hdr->dxferp, size)) {
 337                        kfree(sg_iov);
 338                        ret = -EFAULT;
 339                        goto out;
 340                }
 341
 342                /*
 343                 * Sum up the vecs, making sure they don't overflow
 344                 */
 345                iov = (struct iovec *) sg_iov;
 346                iov_data_len = 0;
 347                for (i = 0; i < hdr->iovec_count; i++) {
 348                        if (iov_data_len + iov[i].iov_len < iov_data_len) {
 349                                kfree(sg_iov);
 350                                ret = -EINVAL;
 351                                goto out;
 352                        }
 353                        iov_data_len += iov[i].iov_len;
 354                }
 355
 356                /* SG_IO howto says that the shorter of the two wins */
 357                if (hdr->dxfer_len < iov_data_len) {
 358                        hdr->iovec_count = iov_shorten(iov,
 359                                                       hdr->iovec_count,
 360                                                       hdr->dxfer_len);
 361                        iov_data_len = hdr->dxfer_len;
 362                }
 363
 364                ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
 365                                          iov_data_len, GFP_KERNEL);
 366                kfree(sg_iov);
 367        } else if (hdr->dxfer_len)
 368                ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 369                                      GFP_KERNEL);
 370
 371        if (ret)
 372                goto out;
 373
 374        bio = rq->bio;
 375        memset(sense, 0, sizeof(sense));
 376        rq->sense = sense;
 377        rq->sense_len = 0;
 378        rq->retries = 0;
 379
 380        start_time = jiffies;
 381
 382        /* ignore return value. All information is passed back to caller
 383         * (if he doesn't check that is his problem).
 384         * N.B. a non-zero SCSI status is _not_ necessarily an error.
 385         */
 386        blk_execute_rq(q, bd_disk, rq, 0);
 387
 388        hdr->duration = jiffies_to_msecs(jiffies - start_time);
 389
 390        return blk_complete_sghdr_rq(rq, hdr, bio);
 391out:
 392        blk_put_request(rq);
 393        return ret;
 394}
 395
 396/**
 397 * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 398 * @file:       file this ioctl operates on (optional)
 399 * @q:          request queue to send scsi commands down
 400 * @disk:       gendisk to operate on (option)
 401 * @sic:        userspace structure describing the command to perform
 402 *
 403 * Send down the scsi command described by @sic to the device below
 404 * the request queue @q.  If @file is non-NULL it's used to perform
 405 * fine-grained permission checks that allow users to send down
 406 * non-destructive SCSI commands.  If the caller has a struct gendisk
 407 * available it should be passed in as @disk to allow the low level
 408 * driver to use the information contained in it.  A non-NULL @disk
 409 * is only allowed if the caller knows that the low level driver doesn't
 410 * need it (e.g. in the scsi subsystem).
 411 *
 412 * Notes:
 413 *   -  This interface is deprecated - users should use the SG_IO
 414 *      interface instead, as this is a more flexible approach to
 415 *      performing SCSI commands on a device.
 416 *   -  The SCSI command length is determined by examining the 1st byte
 417 *      of the given command. There is no way to override this.
 418 *   -  Data transfers are limited to PAGE_SIZE
 419 *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 420 *      accommodate the sense buffer when an error occurs.
 421 *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 422 *      old code will not be surprised.
 423 *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 424 *      a negative return and the Unix error code in 'errno'.
 425 *      If the SCSI command succeeds then 0 is returned.
 426 *      Positive numbers returned are the compacted SCSI error codes (4
 427 *      bytes in one int) where the lowest byte is the SCSI status.
 428 */
 429#define OMAX_SB_LEN 16          /* For backward compatibility */
 430int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 431                struct scsi_ioctl_command __user *sic)
 432{
 433        struct request *rq;
 434        int err;
 435        unsigned int in_len, out_len, bytes, opcode, cmdlen;
 436        char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 437
 438        if (!sic)
 439                return -EINVAL;
 440
 441        /*
 442         * get in an out lengths, verify they don't exceed a page worth of data
 443         */
 444        if (get_user(in_len, &sic->inlen))
 445                return -EFAULT;
 446        if (get_user(out_len, &sic->outlen))
 447                return -EFAULT;
 448        if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 449                return -EINVAL;
 450        if (get_user(opcode, sic->data))
 451                return -EFAULT;
 452
 453        bytes = max(in_len, out_len);
 454        if (bytes) {
 455                buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 456                if (!buffer)
 457                        return -ENOMEM;
 458
 459        }
 460
 461        rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
 462
 463        cmdlen = COMMAND_SIZE(opcode);
 464
 465        /*
 466         * get command and data to send to device, if any
 467         */
 468        err = -EFAULT;
 469        rq->cmd_len = cmdlen;
 470        if (copy_from_user(rq->cmd, sic->data, cmdlen))
 471                goto error;
 472
 473        if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 474                goto error;
 475
 476        err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 477        if (err)
 478                goto error;
 479
 480        /* default.  possible overriden later */
 481        rq->retries = 5;
 482
 483        switch (opcode) {
 484        case SEND_DIAGNOSTIC:
 485        case FORMAT_UNIT:
 486                rq->timeout = FORMAT_UNIT_TIMEOUT;
 487                rq->retries = 1;
 488                break;
 489        case START_STOP:
 490                rq->timeout = START_STOP_TIMEOUT;
 491                break;
 492        case MOVE_MEDIUM:
 493                rq->timeout = MOVE_MEDIUM_TIMEOUT;
 494                break;
 495        case READ_ELEMENT_STATUS:
 496                rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 497                break;
 498        case READ_DEFECT_DATA:
 499                rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 500                rq->retries = 1;
 501                break;
 502        default:
 503                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 504                break;
 505        }
 506
 507        if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
 508                err = DRIVER_ERROR << 24;
 509                goto out;
 510        }
 511
 512        memset(sense, 0, sizeof(sense));
 513        rq->sense = sense;
 514        rq->sense_len = 0;
 515        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 516
 517        blk_execute_rq(q, disk, rq, 0);
 518
 519out:
 520        err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 521        if (err) {
 522                if (rq->sense_len && rq->sense) {
 523                        bytes = (OMAX_SB_LEN > rq->sense_len) ?
 524                                rq->sense_len : OMAX_SB_LEN;
 525                        if (copy_to_user(sic->data, rq->sense, bytes))
 526                                err = -EFAULT;
 527                }
 528        } else {
 529                if (copy_to_user(sic->data, buffer, out_len))
 530                        err = -EFAULT;
 531        }
 532        
 533error:
 534        kfree(buffer);
 535        blk_put_request(rq);
 536        return err;
 537}
 538EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 539
 540/* Send basic block requests */
 541static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 542                              int cmd, int data)
 543{
 544        struct request *rq;
 545        int err;
 546
 547        rq = blk_get_request(q, WRITE, __GFP_WAIT);
 548        rq->cmd_type = REQ_TYPE_BLOCK_PC;
 549        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 550        rq->cmd[0] = cmd;
 551        rq->cmd[4] = data;
 552        rq->cmd_len = 6;
 553        err = blk_execute_rq(q, bd_disk, rq, 0);
 554        blk_put_request(rq);
 555
 556        return err;
 557}
 558
 559static inline int blk_send_start_stop(struct request_queue *q,
 560                                      struct gendisk *bd_disk, int data)
 561{
 562        return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 563}
 564
 565int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 566                   unsigned int cmd, void __user *arg)
 567{
 568        int err;
 569
 570        if (!q)
 571                return -ENXIO;
 572
 573        switch (cmd) {
 574                /*
 575                 * new sgv3 interface
 576                 */
 577                case SG_GET_VERSION_NUM:
 578                        err = sg_get_version(arg);
 579                        break;
 580                case SCSI_IOCTL_GET_IDLUN:
 581                        err = scsi_get_idlun(q, arg);
 582                        break;
 583                case SCSI_IOCTL_GET_BUS_NUMBER:
 584                        err = scsi_get_bus(q, arg);
 585                        break;
 586                case SG_SET_TIMEOUT:
 587                        err = sg_set_timeout(q, arg);
 588                        break;
 589                case SG_GET_TIMEOUT:
 590                        err = sg_get_timeout(q);
 591                        break;
 592                case SG_GET_RESERVED_SIZE:
 593                        err = sg_get_reserved_size(q, arg);
 594                        break;
 595                case SG_SET_RESERVED_SIZE:
 596                        err = sg_set_reserved_size(q, arg);
 597                        break;
 598                case SG_EMULATED_HOST:
 599                        err = sg_emulated_host(q, arg);
 600                        break;
 601                case SG_IO: {
 602                        struct sg_io_hdr hdr;
 603
 604                        err = -EFAULT;
 605                        if (copy_from_user(&hdr, arg, sizeof(hdr)))
 606                                break;
 607                        err = sg_io(q, bd_disk, &hdr, mode);
 608                        if (err == -EFAULT)
 609                                break;
 610
 611                        if (copy_to_user(arg, &hdr, sizeof(hdr)))
 612                                err = -EFAULT;
 613                        break;
 614                }
 615                case CDROM_SEND_PACKET: {
 616                        struct cdrom_generic_command cgc;
 617                        struct sg_io_hdr hdr;
 618
 619                        err = -EFAULT;
 620                        if (copy_from_user(&cgc, arg, sizeof(cgc)))
 621                                break;
 622                        cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 623                        memset(&hdr, 0, sizeof(hdr));
 624                        hdr.interface_id = 'S';
 625                        hdr.cmd_len = sizeof(cgc.cmd);
 626                        hdr.dxfer_len = cgc.buflen;
 627                        err = 0;
 628                        switch (cgc.data_direction) {
 629                                case CGC_DATA_UNKNOWN:
 630                                        hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 631                                        break;
 632                                case CGC_DATA_WRITE:
 633                                        hdr.dxfer_direction = SG_DXFER_TO_DEV;
 634                                        break;
 635                                case CGC_DATA_READ:
 636                                        hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 637                                        break;
 638                                case CGC_DATA_NONE:
 639                                        hdr.dxfer_direction = SG_DXFER_NONE;
 640                                        break;
 641                                default:
 642                                        err = -EINVAL;
 643                        }
 644                        if (err)
 645                                break;
 646
 647                        hdr.dxferp = cgc.buffer;
 648                        hdr.sbp = cgc.sense;
 649                        if (hdr.sbp)
 650                                hdr.mx_sb_len = sizeof(struct request_sense);
 651                        hdr.timeout = jiffies_to_msecs(cgc.timeout);
 652                        hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 653                        hdr.cmd_len = sizeof(cgc.cmd);
 654
 655                        err = sg_io(q, bd_disk, &hdr, mode);
 656                        if (err == -EFAULT)
 657                                break;
 658
 659                        if (hdr.status)
 660                                err = -EIO;
 661
 662                        cgc.stat = err;
 663                        cgc.buflen = hdr.resid;
 664                        if (copy_to_user(arg, &cgc, sizeof(cgc)))
 665                                err = -EFAULT;
 666
 667                        break;
 668                }
 669
 670                /*
 671                 * old junk scsi send command ioctl
 672                 */
 673                case SCSI_IOCTL_SEND_COMMAND:
 674                        printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 675                        err = -EINVAL;
 676                        if (!arg)
 677                                break;
 678
 679                        err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 680                        break;
 681                case CDROMCLOSETRAY:
 682                        err = blk_send_start_stop(q, bd_disk, 0x03);
 683                        break;
 684                case CDROMEJECT:
 685                        err = blk_send_start_stop(q, bd_disk, 0x02);
 686                        break;
 687                default:
 688                        err = -ENOTTY;
 689        }
 690
 691        return err;
 692}
 693EXPORT_SYMBOL(scsi_cmd_ioctl);
 694
 695int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 696{
 697        if (bd && bd == bd->bd_contains)
 698                return 0;
 699
 700        /* Actually none of these is particularly useful on a partition,
 701         * but they are safe.
 702         */
 703        switch (cmd) {
 704        case SCSI_IOCTL_GET_IDLUN:
 705        case SCSI_IOCTL_GET_BUS_NUMBER:
 706        case SCSI_IOCTL_GET_PCI:
 707        case SCSI_IOCTL_PROBE_HOST:
 708        case SG_GET_VERSION_NUM:
 709        case SG_SET_TIMEOUT:
 710        case SG_GET_TIMEOUT:
 711        case SG_GET_RESERVED_SIZE:
 712        case SG_SET_RESERVED_SIZE:
 713        case SG_EMULATED_HOST:
 714                return 0;
 715        case CDROM_GET_CAPABILITY:
 716                /* Keep this until we remove the printk below.  udev sends it
 717                 * and we do not want to spam dmesg about it.   CD-ROMs do
 718                 * not have partitions, so we get here only for disks.
 719                 */
 720                return -ENOIOCTLCMD;
 721        default:
 722                break;
 723        }
 724
 725        if (capable(CAP_SYS_RAWIO))
 726                return 0;
 727
 728        /* In particular, rule out all resets and host-specific ioctls.  */
 729        printk_ratelimited(KERN_WARNING
 730                           "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 731
 732        return -ENOIOCTLCMD;
 733}
 734EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 735
 736int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 737                       unsigned int cmd, void __user *arg)
 738{
 739        int ret;
 740
 741        ret = scsi_verify_blk_ioctl(bd, cmd);
 742        if (ret < 0)
 743                return ret;
 744
 745        return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 746}
 747EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 748
 749static int __init blk_scsi_ioctl_init(void)
 750{
 751        blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 752        return 0;
 753}
 754fs_initcall(blk_scsi_ioctl_init);
 755
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