block/scsi_ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
   4  */
   5 #include <linux/compat.h>
   6 #include <linux/kernel.h>
   7 #include <linux/errno.h>
   8 #include <linux/string.h>
   9 #include <linux/module.h>
  10 #include <linux/blkdev.h>
  11 #include <linux/capability.h>
  12 #include <linux/completion.h>
  13 #include <linux/cdrom.h>
  14 #include <linux/ratelimit.h>
  15 #include <linux/slab.h>
  16 #include <linux/times.h>
  17 #include <linux/uio.h>
  18 #include <linux/uaccess.h>
  19
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_ioctl.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/sg.h>
  24
  25 struct blk_cmd_filter {
  26         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  27         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  28 };
  29
  30 static struct blk_cmd_filter blk_default_cmd_filter;
  31
  32 /* Command group 3 is reserved and should never be used.  */
  33 const unsigned char scsi_command_size_tbl[8] =
  34 {
  35         6, 10, 10, 12,
  36         16, 12, 10, 10
  37 };
  38 EXPORT_SYMBOL(scsi_command_size_tbl);
  39
  40 static int sg_get_version(int __user *p)
  41 {
  42         static const int sg_version_num = 30527;
  43         return put_user(sg_version_num, p);
  44 }
  45
  46 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  47 {
  48         return put_user(0, p);
  49 }
  50
  51 static int scsi_get_bus(struct request_queue *q, int __user *p)
  52 {
  53         return put_user(0, p);
  54 }
  55
  56 static int sg_get_timeout(struct request_queue *q)
  57 {
  58         return jiffies_to_clock_t(q->sg_timeout);
  59 }
  60
  61 static int sg_set_timeout(struct request_queue *q, int __user *p)
  62 {
  63         int timeout, err = get_user(timeout, p);
  64
  65         if (!err)
  66                 q->sg_timeout = clock_t_to_jiffies(timeout);
  67
  68         return err;
  69 }
  70
  71 static int max_sectors_bytes(struct request_queue *q)
  72 {
  73         unsigned int max_sectors = queue_max_sectors(q);
  74
  75         max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
  76
  77         return max_sectors << 9;
  78 }
  79
  80 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  81 {
  82         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
  83
  84         return put_user(val, p);
  85 }
  86
  87 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
  88 {
  89         int size, err = get_user(size, p);
  90
  91         if (err)
  92                 return err;
  93
  94         if (size < 0)
  95                 return -EINVAL;
  96
  97         q->sg_reserved_size = min(size, max_sectors_bytes(q));
  98         return 0;
  99 }
 100
 101 /*
 102  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 103  * so sure this is worth doing anything about (why would you care??)
 104  */
 105 static int sg_emulated_host(struct request_queue *q, int __user *p)
 106 {
 107         return put_user(1, p);
 108 }
 109
 110 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 111 {
 112         /* Basic read-only commands */
 113         __set_bit(TEST_UNIT_READY, filter->read_ok);
 114         __set_bit(REQUEST_SENSE, filter->read_ok);
 115         __set_bit(READ_6, filter->read_ok);
 116         __set_bit(READ_10, filter->read_ok);
 117         __set_bit(READ_12, filter->read_ok);
 118         __set_bit(READ_16, filter->read_ok);
 119         __set_bit(READ_BUFFER, filter->read_ok);
 120         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 121         __set_bit(READ_CAPACITY, filter->read_ok);
 122         __set_bit(READ_LONG, filter->read_ok);
 123         __set_bit(INQUIRY, filter->read_ok);
 124         __set_bit(MODE_SENSE, filter->read_ok);
 125         __set_bit(MODE_SENSE_10, filter->read_ok);
 126         __set_bit(LOG_SENSE, filter->read_ok);
 127         __set_bit(START_STOP, filter->read_ok);
 128         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 129         __set_bit(VERIFY_16, filter->read_ok);
 130         __set_bit(REPORT_LUNS, filter->read_ok);
 131         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
 132         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 133         __set_bit(MAINTENANCE_IN, filter->read_ok);
 134         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 135
 136         /* Audio CD commands */
 137         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 138         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 139         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 140         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 141         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 142
 143         /* CD/DVD data reading */
 144         __set_bit(GPCMD_READ_CD, filter->read_ok);
 145         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 146         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 147         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 148         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 149         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 150         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 151         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 152         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 153         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 154         __set_bit(GPCMD_SCAN, filter->read_ok);
 155         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 156         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 157         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 158         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 159         __set_bit(GPCMD_SEEK, filter->read_ok);
 160         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 161
 162         /* Basic writing commands */
 163         __set_bit(WRITE_6, filter->write_ok);
 164         __set_bit(WRITE_10, filter->write_ok);
 165         __set_bit(WRITE_VERIFY, filter->write_ok);
 166         __set_bit(WRITE_12, filter->write_ok);
 167         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 168         __set_bit(WRITE_16, filter->write_ok);
 169         __set_bit(WRITE_LONG, filter->write_ok);
 170         __set_bit(WRITE_LONG_2, filter->write_ok);
 171         __set_bit(WRITE_SAME, filter->write_ok);
 172         __set_bit(WRITE_SAME_16, filter->write_ok);
 173         __set_bit(WRITE_SAME_32, filter->write_ok);
 174         __set_bit(ERASE, filter->write_ok);
 175         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 176         __set_bit(MODE_SELECT, filter->write_ok);
 177         __set_bit(LOG_SELECT, filter->write_ok);
 178         __set_bit(GPCMD_BLANK, filter->write_ok);
 179         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 180         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 181         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 182         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 183         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 184         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 185         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 186         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 187         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 188         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 189         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 190         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 191         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 192         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 193         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 194
 195         /* ZBC Commands */
 196         __set_bit(ZBC_OUT, filter->write_ok);
 197         __set_bit(ZBC_IN, filter->read_ok);
 198 }
 199
 200 int blk_verify_command(unsigned char *cmd, fmode_t mode)
 201 {
 202         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 203
 204         /* root can do any command. */
 205         if (capable(CAP_SYS_RAWIO))
 206                 return 0;
 207
 208         /* Anybody who can open the device can do a read-safe command */
 209         if (test_bit(cmd[0], filter->read_ok))
 210                 return 0;
 211
 212         /* Write-safe commands require a writable open */
 213         if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
 214                 return 0;
 215
 216         return -EPERM;
 217 }
 218 EXPORT_SYMBOL(blk_verify_command);
 219
 220 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 221                              struct sg_io_hdr *hdr, fmode_t mode)
 222 {
 223         struct scsi_request *req = scsi_req(rq);
 224
 225         if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
 226                 return -EFAULT;
 227         if (blk_verify_command(req->cmd, mode))
 228                 return -EPERM;
 229
 230         /*
 231          * fill in request structure
 232          */
 233         req->cmd_len = hdr->cmd_len;
 234
 235         rq->timeout = msecs_to_jiffies(hdr->timeout);
 236         if (!rq->timeout)
 237                 rq->timeout = q->sg_timeout;
 238         if (!rq->timeout)
 239                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 240         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 241                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 242
 243         return 0;
 244 }
 245
 246 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 247                                  struct bio *bio)
 248 {
 249         struct scsi_request *req = scsi_req(rq);
 250         int r, ret = 0;
 251
 252         /*
 253          * fill in all the output members
 254          */
 255         hdr->status = req->result & 0xff;
 256         hdr->masked_status = status_byte(req->result);
 257         hdr->msg_status = msg_byte(req->result);
 258         hdr->host_status = host_byte(req->result);
 259         hdr->driver_status = driver_byte(req->result);
 260         hdr->info = 0;
 261         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 262                 hdr->info |= SG_INFO_CHECK;
 263         hdr->resid = req->resid_len;
 264         hdr->sb_len_wr = 0;
 265
 266         if (req->sense_len && hdr->sbp) {
 267                 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
 268
 269                 if (!copy_to_user(hdr->sbp, req->sense, len))
 270                         hdr->sb_len_wr = len;
 271                 else
 272                         ret = -EFAULT;
 273         }
 274
 275         r = blk_rq_unmap_user(bio);
 276         if (!ret)
 277                 ret = r;
 278
 279         return ret;
 280 }
 281
 282 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 283                 struct sg_io_hdr *hdr, fmode_t mode)
 284 {
 285         unsigned long start_time;
 286         ssize_t ret = 0;
 287         int writing = 0;
 288         int at_head = 0;
 289         struct request *rq;
 290         struct scsi_request *req;
 291         struct bio *bio;
 292
 293         if (hdr->interface_id != 'S')
 294                 return -EINVAL;
 295
 296         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 297                 return -EIO;
 298
 299         if (hdr->dxfer_len)
 300                 switch (hdr->dxfer_direction) {
 301                 default:
 302                         return -EINVAL;
 303                 case SG_DXFER_TO_DEV:
 304                         writing = 1;
 305                         break;
 306                 case SG_DXFER_TO_FROM_DEV:
 307                 case SG_DXFER_FROM_DEV:
 308                         break;
 309                 }
 310         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
 311                 at_head = 1;
 312
 313         ret = -ENOMEM;
 314         rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
 315         if (IS_ERR(rq))
 316                 return PTR_ERR(rq);
 317         req = scsi_req(rq);
 318
 319         if (hdr->cmd_len > BLK_MAX_CDB) {
 320                 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
 321                 if (!req->cmd)
 322                         goto out_put_request;
 323         }
 324
 325         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
 326         if (ret < 0)
 327                 goto out_free_cdb;
 328
 329         ret = 0;
 330         if (hdr->iovec_count) {
 331                 struct iov_iter i;
 332                 struct iovec *iov = NULL;
 333
 334 #ifdef CONFIG_COMPAT
 335                 if (in_compat_syscall())
 336                         ret = compat_import_iovec(rq_data_dir(rq),
 337                                    hdr->dxferp, hdr->iovec_count,
 338                                    0, &iov, &i);
 339                 else
 340 #endif
 341                         ret = import_iovec(rq_data_dir(rq),
 342                                    hdr->dxferp, hdr->iovec_count,
 343                                    0, &iov, &i);
 344                 if (ret < 0)
 345                         goto out_free_cdb;
 346
 347                 /* SG_IO howto says that the shorter of the two wins */
 348                 iov_iter_truncate(&i, hdr->dxfer_len);
 349
 350                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
 351                 kfree(iov);
 352         } else if (hdr->dxfer_len)
 353                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 354                                       GFP_KERNEL);
 355
 356         if (ret)
 357                 goto out_free_cdb;
 358
 359         bio = rq->bio;
 360         req->retries = 0;
 361
 362         start_time = jiffies;
 363
 364         /* ignore return value. All information is passed back to caller
 365          * (if he doesn't check that is his problem).
 366          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 367          */
 368         blk_execute_rq(q, bd_disk, rq, at_head);
 369
 370         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 371
 372         ret = blk_complete_sghdr_rq(rq, hdr, bio);
 373
 374 out_free_cdb:
 375         scsi_req_free_cmd(req);
 376 out_put_request:
 377         blk_put_request(rq);
 378         return ret;
 379 }
 380
 381 /**
 382  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 383  * @q:          request queue to send scsi commands down
 384  * @disk:       gendisk to operate on (option)
 385  * @mode:       mode used to open the file through which the ioctl has been
 386  *              submitted
 387  * @sic:        userspace structure describing the command to perform
 388  *
 389  * Send down the scsi command described by @sic to the device below
 390  * the request queue @q.  If @file is non-NULL it's used to perform
 391  * fine-grained permission checks that allow users to send down
 392  * non-destructive SCSI commands.  If the caller has a struct gendisk
 393  * available it should be passed in as @disk to allow the low level
 394  * driver to use the information contained in it.  A non-NULL @disk
 395  * is only allowed if the caller knows that the low level driver doesn't
 396  * need it (e.g. in the scsi subsystem).
 397  *
 398  * Notes:
 399  *   -  This interface is deprecated - users should use the SG_IO
 400  *      interface instead, as this is a more flexible approach to
 401  *      performing SCSI commands on a device.
 402  *   -  The SCSI command length is determined by examining the 1st byte
 403  *      of the given command. There is no way to override this.
 404  *   -  Data transfers are limited to PAGE_SIZE
 405  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 406  *      accommodate the sense buffer when an error occurs.
 407  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 408  *      old code will not be surprised.
 409  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 410  *      a negative return and the Unix error code in 'errno'.
 411  *      If the SCSI command succeeds then 0 is returned.
 412  *      Positive numbers returned are the compacted SCSI error codes (4
 413  *      bytes in one int) where the lowest byte is the SCSI status.
 414  */
 415 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 416                 struct scsi_ioctl_command __user *sic)
 417 {
 418         enum { OMAX_SB_LEN = 16 };      /* For backward compatibility */
 419         struct request *rq;
 420         struct scsi_request *req;
 421         int err;
 422         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 423         char *buffer = NULL;
 424
 425         if (!sic)
 426                 return -EINVAL;
 427
 428         /*
 429          * get in an out lengths, verify they don't exceed a page worth of data
 430          */
 431         if (get_user(in_len, &sic->inlen))
 432                 return -EFAULT;
 433         if (get_user(out_len, &sic->outlen))
 434                 return -EFAULT;
 435         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 436                 return -EINVAL;
 437         if (get_user(opcode, sic->data))
 438                 return -EFAULT;
 439
 440         bytes = max(in_len, out_len);
 441         if (bytes) {
 442                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 443                 if (!buffer)
 444                         return -ENOMEM;
 445
 446         }
 447
 448         rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
 449         if (IS_ERR(rq)) {
 450                 err = PTR_ERR(rq);
 451                 goto error_free_buffer;
 452         }
 453         req = scsi_req(rq);
 454
 455         cmdlen = COMMAND_SIZE(opcode);
 456
 457         /*
 458          * get command and data to send to device, if any
 459          */
 460         err = -EFAULT;
 461         req->cmd_len = cmdlen;
 462         if (copy_from_user(req->cmd, sic->data, cmdlen))
 463                 goto error;
 464
 465         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 466                 goto error;
 467
 468         err = blk_verify_command(req->cmd, mode);
 469         if (err)
 470                 goto error;
 471
 472         /* default.  possible overriden later */
 473         req->retries = 5;
 474
 475         switch (opcode) {
 476         case SEND_DIAGNOSTIC:
 477         case FORMAT_UNIT:
 478                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 479                 req->retries = 1;
 480                 break;
 481         case START_STOP:
 482                 rq->timeout = START_STOP_TIMEOUT;
 483                 break;
 484         case MOVE_MEDIUM:
 485                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 486                 break;
 487         case READ_ELEMENT_STATUS:
 488                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 489                 break;
 490         case READ_DEFECT_DATA:
 491                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 492                 req->retries = 1;
 493                 break;
 494         default:
 495                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 496                 break;
 497         }
 498
 499         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
 500                 err = DRIVER_ERROR << 24;
 501                 goto error;
 502         }
 503
 504         blk_execute_rq(q, disk, rq, 0);
 505
 506         err = req->result & 0xff;       /* only 8 bit SCSI status */
 507         if (err) {
 508                 if (req->sense_len && req->sense) {
 509                         bytes = (OMAX_SB_LEN > req->sense_len) ?
 510                                 req->sense_len : OMAX_SB_LEN;
 511                         if (copy_to_user(sic->data, req->sense, bytes))
 512                                 err = -EFAULT;
 513                 }
 514         } else {
 515                 if (copy_to_user(sic->data, buffer, out_len))
 516                         err = -EFAULT;
 517         }
 518
 519 error:
 520         blk_put_request(rq);
 521
 522 error_free_buffer:
 523         kfree(buffer);
 524
 525         return err;
 526 }
 527 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 528
 529 /* Send basic block requests */
 530 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 531                               int cmd, int data)
 532 {
 533         struct request *rq;
 534         int err;
 535
 536         rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
 537         if (IS_ERR(rq))
 538                 return PTR_ERR(rq);
 539         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 540         scsi_req(rq)->cmd[0] = cmd;
 541         scsi_req(rq)->cmd[4] = data;
 542         scsi_req(rq)->cmd_len = 6;
 543         blk_execute_rq(q, bd_disk, rq, 0);
 544         err = scsi_req(rq)->result ? -EIO : 0;
 545         blk_put_request(rq);
 546
 547         return err;
 548 }
 549
 550 static inline int blk_send_start_stop(struct request_queue *q,
 551                                       struct gendisk *bd_disk, int data)
 552 {
 553         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 554 }
 555
 556 int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
 557 {
 558 #ifdef CONFIG_COMPAT
 559         if (in_compat_syscall()) {
 560                 struct compat_sg_io_hdr hdr32 =  {
 561                         .interface_id    = hdr->interface_id,
 562                         .dxfer_direction = hdr->dxfer_direction,
 563                         .cmd_len         = hdr->cmd_len,
 564                         .mx_sb_len       = hdr->mx_sb_len,
 565                         .iovec_count     = hdr->iovec_count,
 566                         .dxfer_len       = hdr->dxfer_len,
 567                         .dxferp          = (uintptr_t)hdr->dxferp,
 568                         .cmdp            = (uintptr_t)hdr->cmdp,
 569                         .sbp             = (uintptr_t)hdr->sbp,
 570                         .timeout         = hdr->timeout,
 571                         .flags           = hdr->flags,
 572                         .pack_id         = hdr->pack_id,
 573                         .usr_ptr         = (uintptr_t)hdr->usr_ptr,
 574                         .status          = hdr->status,
 575                         .masked_status   = hdr->masked_status,
 576                         .msg_status      = hdr->msg_status,
 577                         .sb_len_wr       = hdr->sb_len_wr,
 578                         .host_status     = hdr->host_status,
 579                         .driver_status   = hdr->driver_status,
 580                         .resid           = hdr->resid,
 581                         .duration        = hdr->duration,
 582                         .info            = hdr->info,
 583                 };
 584
 585                 if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
 586                         return -EFAULT;
 587
 588                 return 0;
 589         }
 590 #endif
 591
 592         if (copy_to_user(argp, hdr, sizeof(*hdr)))
 593                 return -EFAULT;
 594
 595         return 0;
 596 }
 597 EXPORT_SYMBOL(put_sg_io_hdr);
 598
 599 int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
 600 {
 601 #ifdef CONFIG_COMPAT
 602         struct compat_sg_io_hdr hdr32;
 603
 604         if (in_compat_syscall()) {
 605                 if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
 606                         return -EFAULT;
 607
 608                 *hdr = (struct sg_io_hdr) {
 609                         .interface_id    = hdr32.interface_id,
 610                         .dxfer_direction = hdr32.dxfer_direction,
 611                         .cmd_len         = hdr32.cmd_len,
 612                         .mx_sb_len       = hdr32.mx_sb_len,
 613                         .iovec_count     = hdr32.iovec_count,
 614                         .dxfer_len       = hdr32.dxfer_len,
 615                         .dxferp          = compat_ptr(hdr32.dxferp),
 616                         .cmdp            = compat_ptr(hdr32.cmdp),
 617                         .sbp             = compat_ptr(hdr32.sbp),
 618                         .timeout         = hdr32.timeout,
 619                         .flags           = hdr32.flags,
 620                         .pack_id         = hdr32.pack_id,
 621                         .usr_ptr         = compat_ptr(hdr32.usr_ptr),
 622                         .status          = hdr32.status,
 623                         .masked_status   = hdr32.masked_status,
 624                         .msg_status      = hdr32.msg_status,
 625                         .sb_len_wr       = hdr32.sb_len_wr,
 626                         .host_status     = hdr32.host_status,
 627                         .driver_status   = hdr32.driver_status,
 628                         .resid           = hdr32.resid,
 629                         .duration        = hdr32.duration,
 630                         .info            = hdr32.info,
 631                 };
 632
 633                 return 0;
 634         }
 635 #endif
 636
 637         if (copy_from_user(hdr, argp, sizeof(*hdr)))
 638                 return -EFAULT;
 639
 640         return 0;
 641 }
 642 EXPORT_SYMBOL(get_sg_io_hdr);
 643
 644 #ifdef CONFIG_COMPAT
 645 struct compat_cdrom_generic_command {
 646         unsigned char   cmd[CDROM_PACKET_SIZE];
 647         compat_caddr_t  buffer;
 648         compat_uint_t   buflen;
 649         compat_int_t    stat;
 650         compat_caddr_t  sense;
 651         unsigned char   data_direction;
 652         compat_int_t    quiet;
 653         compat_int_t    timeout;
 654         compat_caddr_t  reserved[1];
 655 };
 656 #endif
 657
 658 static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
 659                                       const void __user *arg)
 660 {
 661 #ifdef CONFIG_COMPAT
 662         if (in_compat_syscall()) {
 663                 struct compat_cdrom_generic_command cgc32;
 664
 665                 if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
 666                         return -EFAULT;
 667
 668                 *cgc = (struct cdrom_generic_command) {
 669                         .buffer         = compat_ptr(cgc32.buffer),
 670                         .buflen         = cgc32.buflen,
 671                         .stat           = cgc32.stat,
 672                         .sense          = compat_ptr(cgc32.sense),
 673                         .data_direction = cgc32.data_direction,
 674                         .quiet          = cgc32.quiet,
 675                         .timeout        = cgc32.timeout,
 676                         .reserved[0]    = compat_ptr(cgc32.reserved[0]),
 677                 };
 678                 memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
 679                 return 0;
 680         }
 681 #endif
 682         if (copy_from_user(cgc, arg, sizeof(*cgc)))
 683                 return -EFAULT;
 684
 685         return 0;
 686 }
 687
 688 static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
 689                                       void __user *arg)
 690 {
 691 #ifdef CONFIG_COMPAT
 692         if (in_compat_syscall()) {
 693                 struct compat_cdrom_generic_command cgc32 = {
 694                         .buffer         = (uintptr_t)(cgc->buffer),
 695                         .buflen         = cgc->buflen,
 696                         .stat           = cgc->stat,
 697                         .sense          = (uintptr_t)(cgc->sense),
 698                         .data_direction = cgc->data_direction,
 699                         .quiet          = cgc->quiet,
 700                         .timeout        = cgc->timeout,
 701                         .reserved[0]    = (uintptr_t)(cgc->reserved[0]),
 702                 };
 703                 memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
 704
 705                 if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
 706                         return -EFAULT;
 707
 708                 return 0;
 709         }
 710 #endif
 711         if (copy_to_user(arg, cgc, sizeof(*cgc)))
 712                 return -EFAULT;
 713
 714         return 0;
 715 }
 716
 717 static int scsi_cdrom_send_packet(struct request_queue *q,
 718                                   struct gendisk *bd_disk,
 719                                   fmode_t mode, void __user *arg)
 720 {
 721         struct cdrom_generic_command cgc;
 722         struct sg_io_hdr hdr;
 723         int err;
 724
 725         err = scsi_get_cdrom_generic_arg(&cgc, arg);
 726         if (err)
 727                 return err;
 728
 729         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 730         memset(&hdr, 0, sizeof(hdr));
 731         hdr.interface_id = 'S';
 732         hdr.cmd_len = sizeof(cgc.cmd);
 733         hdr.dxfer_len = cgc.buflen;
 734         switch (cgc.data_direction) {
 735                 case CGC_DATA_UNKNOWN:
 736                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 737                         break;
 738                 case CGC_DATA_WRITE:
 739                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 740                         break;
 741                 case CGC_DATA_READ:
 742                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 743                         break;
 744                 case CGC_DATA_NONE:
 745                         hdr.dxfer_direction = SG_DXFER_NONE;
 746                         break;
 747                 default:
 748                         return -EINVAL;
 749         }
 750
 751         hdr.dxferp = cgc.buffer;
 752         hdr.sbp = cgc.sense;
 753         if (hdr.sbp)
 754                 hdr.mx_sb_len = sizeof(struct request_sense);
 755         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 756         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 757         hdr.cmd_len = sizeof(cgc.cmd);
 758
 759         err = sg_io(q, bd_disk, &hdr, mode);
 760         if (err == -EFAULT)
 761                 return -EFAULT;
 762
 763         if (hdr.status)
 764                 return -EIO;
 765
 766         cgc.stat = err;
 767         cgc.buflen = hdr.resid;
 768         if (scsi_put_cdrom_generic_arg(&cgc, arg))
 769                 return -EFAULT;
 770
 771         return err;
 772 }
 773
 774 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 775                    unsigned int cmd, void __user *arg)
 776 {
 777         int err;
 778
 779         if (!q)
 780                 return -ENXIO;
 781
 782         switch (cmd) {
 783                 /*
 784                  * new sgv3 interface
 785                  */
 786                 case SG_GET_VERSION_NUM:
 787                         err = sg_get_version(arg);
 788                         break;
 789                 case SCSI_IOCTL_GET_IDLUN:
 790                         err = scsi_get_idlun(q, arg);
 791                         break;
 792                 case SCSI_IOCTL_GET_BUS_NUMBER:
 793                         err = scsi_get_bus(q, arg);
 794                         break;
 795                 case SG_SET_TIMEOUT:
 796                         err = sg_set_timeout(q, arg);
 797                         break;
 798                 case SG_GET_TIMEOUT:
 799                         err = sg_get_timeout(q);
 800                         break;
 801                 case SG_GET_RESERVED_SIZE:
 802                         err = sg_get_reserved_size(q, arg);
 803                         break;
 804                 case SG_SET_RESERVED_SIZE:
 805                         err = sg_set_reserved_size(q, arg);
 806                         break;
 807                 case SG_EMULATED_HOST:
 808                         err = sg_emulated_host(q, arg);
 809                         break;
 810                 case SG_IO: {
 811                         struct sg_io_hdr hdr;
 812
 813                         err = get_sg_io_hdr(&hdr, arg);
 814                         if (err)
 815                                 break;
 816                         err = sg_io(q, bd_disk, &hdr, mode);
 817                         if (err == -EFAULT)
 818                                 break;
 819
 820                         if (put_sg_io_hdr(&hdr, arg))
 821                                 err = -EFAULT;
 822                         break;
 823                 }
 824                 case CDROM_SEND_PACKET:
 825                         err = scsi_cdrom_send_packet(q, bd_disk, mode, arg);
 826                         break;
 827
 828                 /*
 829                  * old junk scsi send command ioctl
 830                  */
 831                 case SCSI_IOCTL_SEND_COMMAND:
 832                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 833                         err = -EINVAL;
 834                         if (!arg)
 835                                 break;
 836
 837                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 838                         break;
 839                 case CDROMCLOSETRAY:
 840                         err = blk_send_start_stop(q, bd_disk, 0x03);
 841                         break;
 842                 case CDROMEJECT:
 843                         err = blk_send_start_stop(q, bd_disk, 0x02);
 844                         break;
 845                 default:
 846                         err = -ENOTTY;
 847         }
 848
 849         return err;
 850 }
 851 EXPORT_SYMBOL(scsi_cmd_ioctl);
 852
 853 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 854 {
 855         if (bd && bd == bd->bd_contains)
 856                 return 0;
 857
 858         if (capable(CAP_SYS_RAWIO))
 859                 return 0;
 860
 861         return -ENOIOCTLCMD;
 862 }
 863 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 864
 865 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 866                        unsigned int cmd, void __user *arg)
 867 {
 868         int ret;
 869
 870         ret = scsi_verify_blk_ioctl(bd, cmd);
 871         if (ret < 0)
 872                 return ret;
 873
 874         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 875 }
 876 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 877
 878 /**
 879  * scsi_req_init - initialize certain fields of a scsi_request structure
 880  * @req: Pointer to a scsi_request structure.
 881  * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
 882  * of struct scsi_request.
 883  */
 884 void scsi_req_init(struct scsi_request *req)
 885 {
 886         memset(req->__cmd, 0, sizeof(req->__cmd));
 887         req->cmd = req->__cmd;
 888         req->cmd_len = BLK_MAX_CDB;
 889         req->sense_len = 0;
 890 }
 891 EXPORT_SYMBOL(scsi_req_init);
 892
 893 static int __init blk_scsi_ioctl_init(void)
 894 {
 895         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 896         return 0;
 897 }
 898 fs_initcall(blk_scsi_ioctl_init);