LXR linux/block/scsi

   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 <linux/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 max_sectors_bytes(struct request_queue *q)
  86{
  87        unsigned int max_sectors = queue_max_sectors(q);
  88
  89        max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
  90
  91        return max_sectors << 9;
  92}
  93
  94static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  95{
  96        int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
  97
  98        return put_user(val, p);
  99}
 100
 101static int sg_set_reserved_size(struct request_queue *q, int __user *p)
 102{
 103        int size, err = get_user(size, p);
 104
 105        if (err)
 106                return err;
 107
 108        if (size < 0)
 109                return -EINVAL;
 110
 111        q->sg_reserved_size = min(size, max_sectors_bytes(q));
 112        return 0;
 113}
 114
 115/*
 116 * will always return that we are ATAPI even for a real SCSI drive, I'm not
 117 * so sure this is worth doing anything about (why would you care??)
 118 */
 119static int sg_emulated_host(struct request_queue *q, int __user *p)
 120{
 121        return put_user(1, p);
 122}
 123
 124static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 125{
 126        /* Basic read-only commands */
 127        __set_bit(TEST_UNIT_READY, filter->read_ok);
 128        __set_bit(REQUEST_SENSE, filter->read_ok);
 129        __set_bit(READ_6, filter->read_ok);
 130        __set_bit(READ_10, filter->read_ok);
 131        __set_bit(READ_12, filter->read_ok);
 132        __set_bit(READ_16, filter->read_ok);
 133        __set_bit(READ_BUFFER, filter->read_ok);
 134        __set_bit(READ_DEFECT_DATA, filter->read_ok);
 135        __set_bit(READ_CAPACITY, filter->read_ok);
 136        __set_bit(READ_LONG, filter->read_ok);
 137        __set_bit(INQUIRY, filter->read_ok);
 138        __set_bit(MODE_SENSE, filter->read_ok);
 139        __set_bit(MODE_SENSE_10, filter->read_ok);
 140        __set_bit(LOG_SENSE, filter->read_ok);
 141        __set_bit(START_STOP, filter->read_ok);
 142        __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 143        __set_bit(VERIFY_16, filter->read_ok);
 144        __set_bit(REPORT_LUNS, filter->read_ok);
 145        __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
 146        __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 147        __set_bit(MAINTENANCE_IN, filter->read_ok);
 148        __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 149
 150        /* Audio CD commands */
 151        __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 152        __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 153        __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 154        __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 155        __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 156
 157        /* CD/DVD data reading */
 158        __set_bit(GPCMD_READ_CD, filter->read_ok);
 159        __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 160        __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 161        __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 162        __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 163        __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 164        __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 165        __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 166        __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 167        __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 168        __set_bit(GPCMD_SCAN, filter->read_ok);
 169        __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 170        __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 171        __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 172        __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 173        __set_bit(GPCMD_SEEK, filter->read_ok);
 174        __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 175
 176        /* Basic writing commands */
 177        __set_bit(WRITE_6, filter->write_ok);
 178        __set_bit(WRITE_10, filter->write_ok);
 179        __set_bit(WRITE_VERIFY, filter->write_ok);
 180        __set_bit(WRITE_12, filter->write_ok);
 181        __set_bit(WRITE_VERIFY_12, filter->write_ok);
 182        __set_bit(WRITE_16, filter->write_ok);
 183        __set_bit(WRITE_LONG, filter->write_ok);
 184        __set_bit(WRITE_LONG_2, filter->write_ok);
 185        __set_bit(WRITE_SAME, filter->write_ok);
 186        __set_bit(WRITE_SAME_16, filter->write_ok);
 187        __set_bit(WRITE_SAME_32, filter->write_ok);
 188        __set_bit(ERASE, filter->write_ok);
 189        __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 190        __set_bit(MODE_SELECT, filter->write_ok);
 191        __set_bit(LOG_SELECT, filter->write_ok);
 192        __set_bit(GPCMD_BLANK, filter->write_ok);
 193        __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 194        __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 195        __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 196        __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 197        __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 198        __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 199        __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 200        __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 201        __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 202        __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 203        __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 204        __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 205        __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 206        __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 207        __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 208}
 209
 210int blk_verify_command(unsigned char *cmd, fmode_t mode)
 211{
 212        struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 213
 214        /* root can do any command. */
 215        if (capable(CAP_SYS_RAWIO))
 216                return 0;
 217
 218        /* Anybody who can open the device can do a read-safe command */
 219        if (test_bit(cmd[0], filter->read_ok))
 220                return 0;
 221
 222        /* Write-safe commands require a writable open */
 223        if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
 224                return 0;
 225
 226        return -EPERM;
 227}
 228EXPORT_SYMBOL(blk_verify_command);
 229
 230static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 231                             struct sg_io_hdr *hdr, fmode_t mode)
 232{
 233        struct scsi_request *req = scsi_req(rq);
 234
 235        if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
 236                return -EFAULT;
 237        if (blk_verify_command(req->cmd, mode))
 238                return -EPERM;
 239
 240        /*
 241         * fill in request structure
 242         */
 243        req->cmd_len = hdr->cmd_len;
 244
 245        rq->timeout = msecs_to_jiffies(hdr->timeout);
 246        if (!rq->timeout)
 247                rq->timeout = q->sg_timeout;
 248        if (!rq->timeout)
 249                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 250        if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 251                rq->timeout = BLK_MIN_SG_TIMEOUT;
 252
 253        return 0;
 254}
 255
 256static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 257                                 struct bio *bio)
 258{
 259        struct scsi_request *req = scsi_req(rq);
 260        int r, ret = 0;
 261
 262        /*
 263         * fill in all the output members
 264         */
 265        hdr->status = req->result & 0xff;
 266        hdr->masked_status = status_byte(req->result);
 267        hdr->msg_status = msg_byte(req->result);
 268        hdr->host_status = host_byte(req->result);
 269        hdr->driver_status = driver_byte(req->result);
 270        hdr->info = 0;
 271        if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 272                hdr->info |= SG_INFO_CHECK;
 273        hdr->resid = req->resid_len;
 274        hdr->sb_len_wr = 0;
 275
 276        if (req->sense_len && hdr->sbp) {
 277                int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
 278
 279                if (!copy_to_user(hdr->sbp, req->sense, len))
 280                        hdr->sb_len_wr = len;
 281                else
 282                        ret = -EFAULT;
 283        }
 284
 285        r = blk_rq_unmap_user(bio);
 286        if (!ret)
 287                ret = r;
 288
 289        return ret;
 290}
 291
 292static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 293                struct sg_io_hdr *hdr, fmode_t mode)
 294{
 295        unsigned long start_time;
 296        ssize_t ret = 0;
 297        int writing = 0;
 298        int at_head = 0;
 299        struct request *rq;
 300        struct scsi_request *req;
 301        struct bio *bio;
 302
 303        if (hdr->interface_id != 'S')
 304                return -EINVAL;
 305
 306        if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 307                return -EIO;
 308
 309        if (hdr->dxfer_len)
 310                switch (hdr->dxfer_direction) {
 311                default:
 312                        return -EINVAL;
 313                case SG_DXFER_TO_DEV:
 314                        writing = 1;
 315                        break;
 316                case SG_DXFER_TO_FROM_DEV:
 317                case SG_DXFER_FROM_DEV:
 318                        break;
 319                }
 320        if (hdr->flags & SG_FLAG_Q_AT_HEAD)
 321                at_head = 1;
 322
 323        ret = -ENOMEM;
 324        rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
 325                        GFP_KERNEL);
 326        if (IS_ERR(rq))
 327                return PTR_ERR(rq);
 328        req = scsi_req(rq);
 329
 330        if (hdr->cmd_len > BLK_MAX_CDB) {
 331                req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
 332                if (!req->cmd)
 333                        goto out_put_request;
 334        }
 335
 336        ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
 337        if (ret < 0)
 338                goto out_free_cdb;
 339
 340        ret = 0;
 341        if (hdr->iovec_count) {
 342                struct iov_iter i;
 343                struct iovec *iov = NULL;
 344
 345                ret = import_iovec(rq_data_dir(rq),
 346                                   hdr->dxferp, hdr->iovec_count,
 347                                   0, &iov, &i);
 348                if (ret < 0)
 349                        goto out_free_cdb;
 350
 351                /* SG_IO howto says that the shorter of the two wins */
 352                iov_iter_truncate(&i, hdr->dxfer_len);
 353
 354                ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
 355                kfree(iov);
 356        } else if (hdr->dxfer_len)
 357                ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 358                                      GFP_KERNEL);
 359
 360        if (ret)
 361                goto out_free_cdb;
 362
 363        bio = rq->bio;
 364        req->retries = 0;
 365
 366        start_time = jiffies;
 367
 368        /* ignore return value. All information is passed back to caller
 369         * (if he doesn't check that is his problem).
 370         * N.B. a non-zero SCSI status is _not_ necessarily an error.
 371         */
 372        blk_execute_rq(q, bd_disk, rq, at_head);
 373
 374        hdr->duration = jiffies_to_msecs(jiffies - start_time);
 375
 376        ret = blk_complete_sghdr_rq(rq, hdr, bio);
 377
 378out_free_cdb:
 379        scsi_req_free_cmd(req);
 380out_put_request:
 381        blk_put_request(rq);
 382        return ret;
 383}
 384
 385/**
 386 * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 387 * @q:          request queue to send scsi commands down
 388 * @disk:       gendisk to operate on (option)
 389 * @mode:       mode used to open the file through which the ioctl has been
 390 *              submitted
 391 * @sic:        userspace structure describing the command to perform
 392 *
 393 * Send down the scsi command described by @sic to the device below
 394 * the request queue @q.  If @file is non-NULL it's used to perform
 395 * fine-grained permission checks that allow users to send down
 396 * non-destructive SCSI commands.  If the caller has a struct gendisk
 397 * available it should be passed in as @disk to allow the low level
 398 * driver to use the information contained in it.  A non-NULL @disk
 399 * is only allowed if the caller knows that the low level driver doesn't
 400 * need it (e.g. in the scsi subsystem).
 401 *
 402 * Notes:
 403 *   -  This interface is deprecated - users should use the SG_IO
 404 *      interface instead, as this is a more flexible approach to
 405 *      performing SCSI commands on a device.
 406 *   -  The SCSI command length is determined by examining the 1st byte
 407 *      of the given command. There is no way to override this.
 408 *   -  Data transfers are limited to PAGE_SIZE
 409 *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 410 *      accommodate the sense buffer when an error occurs.
 411 *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 412 *      old code will not be surprised.
 413 *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 414 *      a negative return and the Unix error code in 'errno'.
 415 *      If the SCSI command succeeds then 0 is returned.
 416 *      Positive numbers returned are the compacted SCSI error codes (4
 417 *      bytes in one int) where the lowest byte is the SCSI status.
 418 */
 419int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 420                struct scsi_ioctl_command __user *sic)
 421{
 422        enum { OMAX_SB_LEN = 16 };      /* For backward compatibility */
 423        struct request *rq;
 424        struct scsi_request *req;
 425        int err;
 426        unsigned int in_len, out_len, bytes, opcode, cmdlen;
 427        char *buffer = NULL;
 428
 429        if (!sic)
 430                return -EINVAL;
 431
 432        /*
 433         * get in an out lengths, verify they don't exceed a page worth of data
 434         */
 435        if (get_user(in_len, &sic->inlen))
 436                return -EFAULT;
 437        if (get_user(out_len, &sic->outlen))
 438                return -EFAULT;
 439        if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 440                return -EINVAL;
 441        if (get_user(opcode, sic->data))
 442                return -EFAULT;
 443
 444        bytes = max(in_len, out_len);
 445        if (bytes) {
 446                buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 447                if (!buffer)
 448                        return -ENOMEM;
 449
 450        }
 451
 452        rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
 453                        __GFP_RECLAIM);
 454        if (IS_ERR(rq)) {
 455                err = PTR_ERR(rq);
 456                goto error_free_buffer;
 457        }
 458        req = scsi_req(rq);
 459
 460        cmdlen = COMMAND_SIZE(opcode);
 461
 462        /*
 463         * get command and data to send to device, if any
 464         */
 465        err = -EFAULT;
 466        req->cmd_len = cmdlen;
 467        if (copy_from_user(req->cmd, sic->data, cmdlen))
 468                goto error;
 469
 470        if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 471                goto error;
 472
 473        err = blk_verify_command(req->cmd, mode);
 474        if (err)
 475                goto error;
 476
 477        /* default.  possible overriden later */
 478        req->retries = 5;
 479
 480        switch (opcode) {
 481        case SEND_DIAGNOSTIC:
 482        case FORMAT_UNIT:
 483                rq->timeout = FORMAT_UNIT_TIMEOUT;
 484                req->retries = 1;
 485                break;
 486        case START_STOP:
 487                rq->timeout = START_STOP_TIMEOUT;
 488                break;
 489        case MOVE_MEDIUM:
 490                rq->timeout = MOVE_MEDIUM_TIMEOUT;
 491                break;
 492        case READ_ELEMENT_STATUS:
 493                rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 494                break;
 495        case READ_DEFECT_DATA:
 496                rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 497                req->retries = 1;
 498                break;
 499        default:
 500                rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 501                break;
 502        }
 503
 504        if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
 505                err = DRIVER_ERROR << 24;
 506                goto error;
 507        }
 508
 509        blk_execute_rq(q, disk, rq, 0);
 510
 511        err = req->result & 0xff;       /* only 8 bit SCSI status */
 512        if (err) {
 513                if (req->sense_len && req->sense) {
 514                        bytes = (OMAX_SB_LEN > req->sense_len) ?
 515                                req->sense_len : OMAX_SB_LEN;
 516                        if (copy_to_user(sic->data, req->sense, bytes))
 517                                err = -EFAULT;
 518                }
 519        } else {
 520                if (copy_to_user(sic->data, buffer, out_len))
 521                        err = -EFAULT;
 522        }
 523        
 524error:
 525        blk_put_request(rq);
 526
 527error_free_buffer:
 528        kfree(buffer);
 529
 530        return err;
 531}
 532EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 533
 534/* Send basic block requests */
 535static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 536                              int cmd, int data)
 537{
 538        struct request *rq;
 539        int err;
 540
 541        rq = blk_get_request(q, REQ_OP_SCSI_OUT, __GFP_RECLAIM);
 542        if (IS_ERR(rq))
 543                return PTR_ERR(rq);
 544        rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 545        scsi_req(rq)->cmd[0] = cmd;
 546        scsi_req(rq)->cmd[4] = data;
 547        scsi_req(rq)->cmd_len = 6;
 548        blk_execute_rq(q, bd_disk, rq, 0);
 549        err = scsi_req(rq)->result ? -EIO : 0;
 550        blk_put_request(rq);
 551
 552        return err;
 553}
 554
 555static inline int blk_send_start_stop(struct request_queue *q,
 556                                      struct gendisk *bd_disk, int data)
 557{
 558        return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 559}
 560
 561int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 562                   unsigned int cmd, void __user *arg)
 563{
 564        int err;
 565
 566        if (!q)
 567                return -ENXIO;
 568
 569        switch (cmd) {
 570                /*
 571                 * new sgv3 interface
 572                 */
 573                case SG_GET_VERSION_NUM:
 574                        err = sg_get_version(arg);
 575                        break;
 576                case SCSI_IOCTL_GET_IDLUN:
 577                        err = scsi_get_idlun(q, arg);
 578                        break;
 579                case SCSI_IOCTL_GET_BUS_NUMBER:
 580                        err = scsi_get_bus(q, arg);
 581                        break;
 582                case SG_SET_TIMEOUT:
 583                        err = sg_set_timeout(q, arg);
 584                        break;
 585                case SG_GET_TIMEOUT:
 586                        err = sg_get_timeout(q);
 587                        break;
 588                case SG_GET_RESERVED_SIZE:
 589                        err = sg_get_reserved_size(q, arg);
 590                        break;
 591                case SG_SET_RESERVED_SIZE:
 592                        err = sg_set_reserved_size(q, arg);
 593                        break;
 594                case SG_EMULATED_HOST:
 595                        err = sg_emulated_host(q, arg);
 596                        break;
 597                case SG_IO: {
 598                        struct sg_io_hdr hdr;
 599
 600                        err = -EFAULT;
 601                        if (copy_from_user(&hdr, arg, sizeof(hdr)))
 602                                break;
 603                        err = sg_io(q, bd_disk, &hdr, mode);
 604                        if (err == -EFAULT)
 605                                break;
 606
 607                        if (copy_to_user(arg, &hdr, sizeof(hdr)))
 608                                err = -EFAULT;
 609                        break;
 610                }
 611                case CDROM_SEND_PACKET: {
 612                        struct cdrom_generic_command cgc;
 613                        struct sg_io_hdr hdr;
 614
 615                        err = -EFAULT;
 616                        if (copy_from_user(&cgc, arg, sizeof(cgc)))
 617                                break;
 618                        cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 619                        memset(&hdr, 0, sizeof(hdr));
 620                        hdr.interface_id = 'S';
 621                        hdr.cmd_len = sizeof(cgc.cmd);
 622                        hdr.dxfer_len = cgc.buflen;
 623                        err = 0;
 624                        switch (cgc.data_direction) {
 625                                case CGC_DATA_UNKNOWN:
 626                                        hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 627                                        break;
 628                                case CGC_DATA_WRITE:
 629                                        hdr.dxfer_direction = SG_DXFER_TO_DEV;
 630                                        break;
 631                                case CGC_DATA_READ:
 632                                        hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 633                                        break;
 634                                case CGC_DATA_NONE:
 635                                        hdr.dxfer_direction = SG_DXFER_NONE;
 636                                        break;
 637                                default:
 638                                        err = -EINVAL;
 639                        }
 640                        if (err)
 641                                break;
 642
 643                        hdr.dxferp = cgc.buffer;
 644                        hdr.sbp = cgc.sense;
 645                        if (hdr.sbp)
 646                                hdr.mx_sb_len = sizeof(struct request_sense);
 647                        hdr.timeout = jiffies_to_msecs(cgc.timeout);
 648                        hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 649                        hdr.cmd_len = sizeof(cgc.cmd);
 650
 651                        err = sg_io(q, bd_disk, &hdr, mode);
 652                        if (err == -EFAULT)
 653                                break;
 654
 655                        if (hdr.status)
 656                                err = -EIO;
 657
 658                        cgc.stat = err;
 659                        cgc.buflen = hdr.resid;
 660                        if (copy_to_user(arg, &cgc, sizeof(cgc)))
 661                                err = -EFAULT;
 662
 663                        break;
 664                }
 665
 666                /*
 667                 * old junk scsi send command ioctl
 668                 */
 669                case SCSI_IOCTL_SEND_COMMAND:
 670                        printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 671                        err = -EINVAL;
 672                        if (!arg)
 673                                break;
 674
 675                        err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 676                        break;
 677                case CDROMCLOSETRAY:
 678                        err = blk_send_start_stop(q, bd_disk, 0x03);
 679                        break;
 680                case CDROMEJECT:
 681                        err = blk_send_start_stop(q, bd_disk, 0x02);
 682                        break;
 683                default:
 684                        err = -ENOTTY;
 685        }
 686
 687        return err;
 688}
 689EXPORT_SYMBOL(scsi_cmd_ioctl);
 690
 691int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 692{
 693        if (bd && bd == bd->bd_contains)
 694                return 0;
 695
 696        if (capable(CAP_SYS_RAWIO))
 697                return 0;
 698
 699        return -ENOIOCTLCMD;
 700}
 701EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 702
 703int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 704                       unsigned int cmd, void __user *arg)
 705{
 706        int ret;
 707
 708        ret = scsi_verify_blk_ioctl(bd, cmd);
 709        if (ret < 0)
 710                return ret;
 711
 712        return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 713}
 714EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 715
 716/**
 717 * scsi_req_init - initialize certain fields of a scsi_request structure
 718 * @req: Pointer to a scsi_request structure.
 719 * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
 720 * of struct scsi_request.
 721 */
 722void scsi_req_init(struct scsi_request *req)
 723{
 724        memset(req->__cmd, 0, sizeof(req->__cmd));
 725        req->cmd = req->__cmd;
 726        req->cmd_len = BLK_MAX_CDB;
 727        req->sense_len = 0;
 728}
 729EXPORT_SYMBOL(scsi_req_init);
 730
 731static int __init blk_scsi_ioctl_init(void)
 732{
 733        blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 734        return 0;
 735}
 736fs_initcall(blk_scsi_ioctl_init);
 737