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 #include <scsi/sg.h>
  41
  42 static int sg_get_version(int __user *p)
  43 {
  44         static const int sg_version_num = 30527;
  45         return put_user(sg_version_num, p);
  46 }
  47
  48 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  49 {
  50         return put_user(0, p);
  51 }
  52
  53 static int scsi_get_bus(struct request_queue *q, int __user *p)
  54 {
  55         return put_user(0, p);
  56 }
  57
  58 static int sg_get_timeout(struct request_queue *q)
  59 {
  60         return jiffies_to_clock_t(q->sg_timeout);
  61 }
  62
  63 static int sg_set_timeout(struct request_queue *q, int __user *p)
  64 {
  65         int timeout, err = get_user(timeout, p);
  66
  67         if (!err)
  68                 q->sg_timeout = clock_t_to_jiffies(timeout);
  69
  70         return err;
  71 }
  72
  73 static int max_sectors_bytes(struct request_queue *q)
  74 {
  75         unsigned int max_sectors = queue_max_sectors(q);
  76
  77         max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
  78
  79         return max_sectors << 9;
  80 }
  81
  82 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  83 {
  84         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
  85
  86         return put_user(val, p);
  87 }
  88
  89 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
  90 {
  91         int size, err = get_user(size, p);
  92
  93         if (err)
  94                 return err;
  95
  96         if (size < 0)
  97                 return -EINVAL;
  98
  99         q->sg_reserved_size = min(size, max_sectors_bytes(q));
 100         return 0;
 101 }
 102
 103 /*
 104  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 105  * so sure this is worth doing anything about (why would you care??)
 106  */
 107 static int sg_emulated_host(struct request_queue *q, int __user *p)
 108 {
 109         return put_user(1, p);
 110 }
 111
 112 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 113 {
 114         /* Basic read-only commands */
 115         __set_bit(TEST_UNIT_READY, filter->read_ok);
 116         __set_bit(REQUEST_SENSE, filter->read_ok);
 117         __set_bit(READ_6, filter->read_ok);
 118         __set_bit(READ_10, filter->read_ok);
 119         __set_bit(READ_12, filter->read_ok);
 120         __set_bit(READ_16, filter->read_ok);
 121         __set_bit(READ_BUFFER, filter->read_ok);
 122         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 123         __set_bit(READ_CAPACITY, filter->read_ok);
 124         __set_bit(READ_LONG, filter->read_ok);
 125         __set_bit(INQUIRY, filter->read_ok);
 126         __set_bit(MODE_SENSE, filter->read_ok);
 127         __set_bit(MODE_SENSE_10, filter->read_ok);
 128         __set_bit(LOG_SENSE, filter->read_ok);
 129         __set_bit(START_STOP, filter->read_ok);
 130         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 131         __set_bit(VERIFY_16, filter->read_ok);
 132         __set_bit(REPORT_LUNS, filter->read_ok);
 133         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
 134         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 135         __set_bit(MAINTENANCE_IN, filter->read_ok);
 136         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 137
 138         /* Audio CD commands */
 139         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 140         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 141         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 142         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 143         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 144
 145         /* CD/DVD data reading */
 146         __set_bit(GPCMD_READ_CD, filter->read_ok);
 147         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 148         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 149         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 150         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 151         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 152         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 153         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 154         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 155         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 156         __set_bit(GPCMD_SCAN, filter->read_ok);
 157         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 158         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 159         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 160         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 161         __set_bit(GPCMD_SEEK, filter->read_ok);
 162         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 163
 164         /* Basic writing commands */
 165         __set_bit(WRITE_6, filter->write_ok);
 166         __set_bit(WRITE_10, filter->write_ok);
 167         __set_bit(WRITE_VERIFY, filter->write_ok);
 168         __set_bit(WRITE_12, filter->write_ok);
 169         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 170         __set_bit(WRITE_16, filter->write_ok);
 171         __set_bit(WRITE_LONG, filter->write_ok);
 172         __set_bit(WRITE_LONG_2, filter->write_ok);
 173         __set_bit(WRITE_SAME, filter->write_ok);
 174         __set_bit(WRITE_SAME_16, filter->write_ok);
 175         __set_bit(WRITE_SAME_32, filter->write_ok);
 176         __set_bit(ERASE, filter->write_ok);
 177         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 178         __set_bit(MODE_SELECT, filter->write_ok);
 179         __set_bit(LOG_SELECT, filter->write_ok);
 180         __set_bit(GPCMD_BLANK, filter->write_ok);
 181         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 182         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 183         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 184         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 185         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 186         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 187         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 188         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 189         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 190         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 191         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 192         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 193         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 194         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 195         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 196
 197         /* ZBC Commands */
 198         __set_bit(ZBC_OUT, filter->write_ok);
 199         __set_bit(ZBC_IN, filter->read_ok);
 200 }
 201
 202 int blk_verify_command(unsigned char *cmd, fmode_t mode)
 203 {
 204         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 205
 206         /* root can do any command. */
 207         if (capable(CAP_SYS_RAWIO))
 208                 return 0;
 209
 210         /* Anybody who can open the device can do a read-safe command */
 211         if (test_bit(cmd[0], filter->read_ok))
 212                 return 0;
 213
 214         /* Write-safe commands require a writable open */
 215         if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
 216                 return 0;
 217
 218         return -EPERM;
 219 }
 220 EXPORT_SYMBOL(blk_verify_command);
 221
 222 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 223                              struct sg_io_hdr *hdr, fmode_t mode)
 224 {
 225         struct scsi_request *req = scsi_req(rq);
 226
 227         if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
 228                 return -EFAULT;
 229         if (blk_verify_command(req->cmd, mode))
 230                 return -EPERM;
 231
 232         /*
 233          * fill in request structure
 234          */
 235         req->cmd_len = hdr->cmd_len;
 236
 237         rq->timeout = msecs_to_jiffies(hdr->timeout);
 238         if (!rq->timeout)
 239                 rq->timeout = q->sg_timeout;
 240         if (!rq->timeout)
 241                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 242         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 243                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 244
 245         return 0;
 246 }
 247
 248 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 249                                  struct bio *bio)
 250 {
 251         struct scsi_request *req = scsi_req(rq);
 252         int r, ret = 0;
 253
 254         /*
 255          * fill in all the output members
 256          */
 257         hdr->status = req->result & 0xff;
 258         hdr->masked_status = status_byte(req->result);
 259         hdr->msg_status = msg_byte(req->result);
 260         hdr->host_status = host_byte(req->result);
 261         hdr->driver_status = driver_byte(req->result);
 262         hdr->info = 0;
 263         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 264                 hdr->info |= SG_INFO_CHECK;
 265         hdr->resid = req->resid_len;
 266         hdr->sb_len_wr = 0;
 267
 268         if (req->sense_len && hdr->sbp) {
 269                 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
 270
 271                 if (!copy_to_user(hdr->sbp, req->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
 281         return ret;
 282 }
 283
 284 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 285                 struct sg_io_hdr *hdr, fmode_t mode)
 286 {
 287         unsigned long start_time;
 288         ssize_t ret = 0;
 289         int writing = 0;
 290         int at_head = 0;
 291         struct request *rq;
 292         struct scsi_request *req;
 293         struct bio *bio;
 294
 295         if (hdr->interface_id != 'S')
 296                 return -EINVAL;
 297
 298         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 299                 return -EIO;
 300
 301         if (hdr->dxfer_len)
 302                 switch (hdr->dxfer_direction) {
 303                 default:
 304                         return -EINVAL;
 305                 case SG_DXFER_TO_DEV:
 306                         writing = 1;
 307                         break;
 308                 case SG_DXFER_TO_FROM_DEV:
 309                 case SG_DXFER_FROM_DEV:
 310                         break;
 311                 }
 312         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
 313                 at_head = 1;
 314
 315         ret = -ENOMEM;
 316         rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
 317         if (IS_ERR(rq))
 318                 return PTR_ERR(rq);
 319         req = scsi_req(rq);
 320
 321         if (hdr->cmd_len > BLK_MAX_CDB) {
 322                 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
 323                 if (!req->cmd)
 324                         goto out_put_request;
 325         }
 326
 327         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
 328         if (ret < 0)
 329                 goto out_free_cdb;
 330
 331         ret = 0;
 332         if (hdr->iovec_count) {
 333                 struct iov_iter i;
 334                 struct iovec *iov = NULL;
 335
 336 #ifdef CONFIG_COMPAT
 337                 if (in_compat_syscall())
 338                         ret = compat_import_iovec(rq_data_dir(rq),
 339                                    hdr->dxferp, hdr->iovec_count,
 340                                    0, &iov, &i);
 341                 else
 342 #endif
 343                         ret = import_iovec(rq_data_dir(rq),
 344                                    hdr->dxferp, hdr->iovec_count,
 345                                    0, &iov, &i);
 346                 if (ret < 0)
 347                         goto out_free_cdb;
 348
 349                 /* SG_IO howto says that the shorter of the two wins */
 350                 iov_iter_truncate(&i, hdr->dxfer_len);
 351
 352                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
 353                 kfree(iov);
 354         } else if (hdr->dxfer_len)
 355                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 356                                       GFP_KERNEL);
 357
 358         if (ret)
 359                 goto out_free_cdb;
 360
 361         bio = rq->bio;
 362         req->retries = 0;
 363
 364         start_time = jiffies;
 365
 366         /* ignore return value. All information is passed back to caller
 367          * (if he doesn't check that is his problem).
 368          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 369          */
 370         blk_execute_rq(q, bd_disk, rq, at_head);
 371
 372         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 373
 374         ret = blk_complete_sghdr_rq(rq, hdr, bio);
 375
 376 out_free_cdb:
 377         scsi_req_free_cmd(req);
 378 out_put_request:
 379         blk_put_request(rq);
 380         return ret;
 381 }
 382
 383 /**
 384  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 385  * @q:          request queue to send scsi commands down
 386  * @disk:       gendisk to operate on (option)
 387  * @mode:       mode used to open the file through which the ioctl has been
 388  *              submitted
 389  * @sic:        userspace structure describing the command to perform
 390  *
 391  * Send down the scsi command described by @sic to the device below
 392  * the request queue @q.  If @file is non-NULL it's used to perform
 393  * fine-grained permission checks that allow users to send down
 394  * non-destructive SCSI commands.  If the caller has a struct gendisk
 395  * available it should be passed in as @disk to allow the low level
 396  * driver to use the information contained in it.  A non-NULL @disk
 397  * is only allowed if the caller knows that the low level driver doesn't
 398  * need it (e.g. in the scsi subsystem).
 399  *
 400  * Notes:
 401  *   -  This interface is deprecated - users should use the SG_IO
 402  *      interface instead, as this is a more flexible approach to
 403  *      performing SCSI commands on a device.
 404  *   -  The SCSI command length is determined by examining the 1st byte
 405  *      of the given command. There is no way to override this.
 406  *   -  Data transfers are limited to PAGE_SIZE
 407  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 408  *      accommodate the sense buffer when an error occurs.
 409  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 410  *      old code will not be surprised.
 411  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 412  *      a negative return and the Unix error code in 'errno'.
 413  *      If the SCSI command succeeds then 0 is returned.
 414  *      Positive numbers returned are the compacted SCSI error codes (4
 415  *      bytes in one int) where the lowest byte is the SCSI status.
 416  */
 417 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 418                 struct scsi_ioctl_command __user *sic)
 419 {
 420         enum { OMAX_SB_LEN = 16 };      /* For backward compatibility */
 421         struct request *rq;
 422         struct scsi_request *req;
 423         int err;
 424         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 425         char *buffer = NULL;
 426
 427         if (!sic)
 428                 return -EINVAL;
 429
 430         /*
 431          * get in an out lengths, verify they don't exceed a page worth of data
 432          */
 433         if (get_user(in_len, &sic->inlen))
 434                 return -EFAULT;
 435         if (get_user(out_len, &sic->outlen))
 436                 return -EFAULT;
 437         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 438                 return -EINVAL;
 439         if (get_user(opcode, sic->data))
 440                 return -EFAULT;
 441
 442         bytes = max(in_len, out_len);
 443         if (bytes) {
 444                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 445                 if (!buffer)
 446                         return -ENOMEM;
 447
 448         }
 449
 450         rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
 451         if (IS_ERR(rq)) {
 452                 err = PTR_ERR(rq);
 453                 goto error_free_buffer;
 454         }
 455         req = scsi_req(rq);
 456
 457         cmdlen = COMMAND_SIZE(opcode);
 458
 459         /*
 460          * get command and data to send to device, if any
 461          */
 462         err = -EFAULT;
 463         req->cmd_len = cmdlen;
 464         if (copy_from_user(req->cmd, sic->data, cmdlen))
 465                 goto error;
 466
 467         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 468                 goto error;
 469
 470         err = blk_verify_command(req->cmd, mode);
 471         if (err)
 472                 goto error;
 473
 474         /* default.  possible overriden later */
 475         req->retries = 5;
 476
 477         switch (opcode) {
 478         case SEND_DIAGNOSTIC:
 479         case FORMAT_UNIT:
 480                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 481                 req->retries = 1;
 482                 break;
 483         case START_STOP:
 484                 rq->timeout = START_STOP_TIMEOUT;
 485                 break;
 486         case MOVE_MEDIUM:
 487                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 488                 break;
 489         case READ_ELEMENT_STATUS:
 490                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 491                 break;
 492         case READ_DEFECT_DATA:
 493                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 494                 req->retries = 1;
 495                 break;
 496         default:
 497                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 498                 break;
 499         }
 500
 501         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
 502                 err = DRIVER_ERROR << 24;
 503                 goto error;
 504         }
 505
 506         blk_execute_rq(q, disk, rq, 0);
 507
 508         err = req->result & 0xff;       /* only 8 bit SCSI status */
 509         if (err) {
 510                 if (req->sense_len && req->sense) {
 511                         bytes = (OMAX_SB_LEN > req->sense_len) ?
 512                                 req->sense_len : OMAX_SB_LEN;
 513                         if (copy_to_user(sic->data, req->sense, bytes))
 514                                 err = -EFAULT;
 515                 }
 516         } else {
 517                 if (copy_to_user(sic->data, buffer, out_len))
 518                         err = -EFAULT;
 519         }
 520
 521 error:
 522         blk_put_request(rq);
 523
 524 error_free_buffer:
 525         kfree(buffer);
 526
 527         return err;
 528 }
 529 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 530
 531 /* Send basic block requests */
 532 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 533                               int cmd, int data)
 534 {
 535         struct request *rq;
 536         int err;
 537
 538         rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
 539         if (IS_ERR(rq))
 540                 return PTR_ERR(rq);
 541         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 542         scsi_req(rq)->cmd[0] = cmd;
 543         scsi_req(rq)->cmd[4] = data;
 544         scsi_req(rq)->cmd_len = 6;
 545         blk_execute_rq(q, bd_disk, rq, 0);
 546         err = scsi_req(rq)->result ? -EIO : 0;
 547         blk_put_request(rq);
 548
 549         return err;
 550 }
 551
 552 static inline int blk_send_start_stop(struct request_queue *q,
 553                                       struct gendisk *bd_disk, int data)
 554 {
 555         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 556 }
 557
 558 int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
 559 {
 560 #ifdef CONFIG_COMPAT
 561         if (in_compat_syscall()) {
 562                 struct compat_sg_io_hdr hdr32 =  {
 563                         .interface_id    = hdr->interface_id,
 564                         .dxfer_direction = hdr->dxfer_direction,
 565                         .cmd_len         = hdr->cmd_len,
 566                         .mx_sb_len       = hdr->mx_sb_len,
 567                         .iovec_count     = hdr->iovec_count,
 568                         .dxfer_len       = hdr->dxfer_len,
 569                         .dxferp          = (uintptr_t)hdr->dxferp,
 570                         .cmdp            = (uintptr_t)hdr->cmdp,
 571                         .sbp             = (uintptr_t)hdr->sbp,
 572                         .timeout         = hdr->timeout,
 573                         .flags           = hdr->flags,
 574                         .pack_id         = hdr->pack_id,
 575                         .usr_ptr         = (uintptr_t)hdr->usr_ptr,
 576                         .status          = hdr->status,
 577                         .masked_status   = hdr->masked_status,
 578                         .msg_status      = hdr->msg_status,
 579                         .sb_len_wr       = hdr->sb_len_wr,
 580                         .host_status     = hdr->host_status,
 581                         .driver_status   = hdr->driver_status,
 582                         .resid           = hdr->resid,
 583                         .duration        = hdr->duration,
 584                         .info            = hdr->info,
 585                 };
 586
 587                 if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
 588                         return -EFAULT;
 589
 590                 return 0;
 591         }
 592 #endif
 593
 594         if (copy_to_user(argp, hdr, sizeof(*hdr)))
 595                 return -EFAULT;
 596
 597         return 0;
 598 }
 599 EXPORT_SYMBOL(put_sg_io_hdr);
 600
 601 int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
 602 {
 603 #ifdef CONFIG_COMPAT
 604         struct compat_sg_io_hdr hdr32;
 605
 606         if (in_compat_syscall()) {
 607                 if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
 608                         return -EFAULT;
 609
 610                 *hdr = (struct sg_io_hdr) {
 611                         .interface_id    = hdr32.interface_id,
 612                         .dxfer_direction = hdr32.dxfer_direction,
 613                         .cmd_len         = hdr32.cmd_len,
 614                         .mx_sb_len       = hdr32.mx_sb_len,
 615                         .iovec_count     = hdr32.iovec_count,
 616                         .dxfer_len       = hdr32.dxfer_len,
 617                         .dxferp          = compat_ptr(hdr32.dxferp),
 618                         .cmdp            = compat_ptr(hdr32.cmdp),
 619                         .sbp             = compat_ptr(hdr32.sbp),
 620                         .timeout         = hdr32.timeout,
 621                         .flags           = hdr32.flags,
 622                         .pack_id         = hdr32.pack_id,
 623                         .usr_ptr         = compat_ptr(hdr32.usr_ptr),
 624                         .status          = hdr32.status,
 625                         .masked_status   = hdr32.masked_status,
 626                         .msg_status      = hdr32.msg_status,
 627                         .sb_len_wr       = hdr32.sb_len_wr,
 628                         .host_status     = hdr32.host_status,
 629                         .driver_status   = hdr32.driver_status,
 630                         .resid           = hdr32.resid,
 631                         .duration        = hdr32.duration,
 632                         .info            = hdr32.info,
 633                 };
 634
 635                 return 0;
 636         }
 637 #endif
 638
 639         if (copy_from_user(hdr, argp, sizeof(*hdr)))
 640                 return -EFAULT;
 641
 642         return 0;
 643 }
 644 EXPORT_SYMBOL(get_sg_io_hdr);
 645
 646 #ifdef CONFIG_COMPAT
 647 struct compat_cdrom_generic_command {
 648         unsigned char   cmd[CDROM_PACKET_SIZE];
 649         compat_caddr_t  buffer;
 650         compat_uint_t   buflen;
 651         compat_int_t    stat;
 652         compat_caddr_t  sense;
 653         unsigned char   data_direction;
 654         unsigned char   pad[3];
 655         compat_int_t    quiet;
 656         compat_int_t    timeout;
 657         compat_caddr_t  reserved[1];
 658 };
 659 #endif
 660
 661 static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
 662                                       const void __user *arg)
 663 {
 664 #ifdef CONFIG_COMPAT
 665         if (in_compat_syscall()) {
 666                 struct compat_cdrom_generic_command cgc32;
 667
 668                 if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
 669                         return -EFAULT;
 670
 671                 *cgc = (struct cdrom_generic_command) {
 672                         .buffer         = compat_ptr(cgc32.buffer),
 673                         .buflen         = cgc32.buflen,
 674                         .stat           = cgc32.stat,
 675                         .sense          = compat_ptr(cgc32.sense),
 676                         .data_direction = cgc32.data_direction,
 677                         .quiet          = cgc32.quiet,
 678                         .timeout        = cgc32.timeout,
 679                         .reserved[0]    = compat_ptr(cgc32.reserved[0]),
 680                 };
 681                 memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
 682                 return 0;
 683         }
 684 #endif
 685         if (copy_from_user(cgc, arg, sizeof(*cgc)))
 686                 return -EFAULT;
 687
 688         return 0;
 689 }
 690
 691 static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
 692                                       void __user *arg)
 693 {
 694 #ifdef CONFIG_COMPAT
 695         if (in_compat_syscall()) {
 696                 struct compat_cdrom_generic_command cgc32 = {
 697                         .buffer         = (uintptr_t)(cgc->buffer),
 698                         .buflen         = cgc->buflen,
 699                         .stat           = cgc->stat,
 700                         .sense          = (uintptr_t)(cgc->sense),
 701                         .data_direction = cgc->data_direction,
 702                         .quiet          = cgc->quiet,
 703                         .timeout        = cgc->timeout,
 704                         .reserved[0]    = (uintptr_t)(cgc->reserved[0]),
 705                 };
 706                 memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
 707
 708                 if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
 709                         return -EFAULT;
 710
 711                 return 0;
 712         }
 713 #endif
 714         if (copy_to_user(arg, cgc, sizeof(*cgc)))
 715                 return -EFAULT;
 716
 717         return 0;
 718 }
 719
 720 static int scsi_cdrom_send_packet(struct request_queue *q,
 721                                   struct gendisk *bd_disk,
 722                                   fmode_t mode, void __user *arg)
 723 {
 724         struct cdrom_generic_command cgc;
 725         struct sg_io_hdr hdr;
 726         int err;
 727
 728         err = scsi_get_cdrom_generic_arg(&cgc, arg);
 729         if (err)
 730                 return err;
 731
 732         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 733         memset(&hdr, 0, sizeof(hdr));
 734         hdr.interface_id = 'S';
 735         hdr.cmd_len = sizeof(cgc.cmd);
 736         hdr.dxfer_len = cgc.buflen;
 737         switch (cgc.data_direction) {
 738                 case CGC_DATA_UNKNOWN:
 739                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 740                         break;
 741                 case CGC_DATA_WRITE:
 742                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 743                         break;
 744                 case CGC_DATA_READ:
 745                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 746                         break;
 747                 case CGC_DATA_NONE:
 748                         hdr.dxfer_direction = SG_DXFER_NONE;
 749                         break;
 750                 default:
 751                         return -EINVAL;
 752         }
 753
 754         hdr.dxferp = cgc.buffer;
 755         hdr.sbp = cgc.sense;
 756         if (hdr.sbp)
 757                 hdr.mx_sb_len = sizeof(struct request_sense);
 758         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 759         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 760         hdr.cmd_len = sizeof(cgc.cmd);
 761
 762         err = sg_io(q, bd_disk, &hdr, mode);
 763         if (err == -EFAULT)
 764                 return -EFAULT;
 765
 766         if (hdr.status)
 767                 return -EIO;
 768
 769         cgc.stat = err;
 770         cgc.buflen = hdr.resid;
 771         if (scsi_put_cdrom_generic_arg(&cgc, arg))
 772                 return -EFAULT;
 773
 774         return err;
 775 }
 776
 777 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 778                    unsigned int cmd, void __user *arg)
 779 {
 780         int err;
 781
 782         if (!q)
 783                 return -ENXIO;
 784
 785         switch (cmd) {
 786                 /*
 787                  * new sgv3 interface
 788                  */
 789                 case SG_GET_VERSION_NUM:
 790                         err = sg_get_version(arg);
 791                         break;
 792                 case SCSI_IOCTL_GET_IDLUN:
 793                         err = scsi_get_idlun(q, arg);
 794                         break;
 795                 case SCSI_IOCTL_GET_BUS_NUMBER:
 796                         err = scsi_get_bus(q, arg);
 797                         break;
 798                 case SG_SET_TIMEOUT:
 799                         err = sg_set_timeout(q, arg);
 800                         break;
 801                 case SG_GET_TIMEOUT:
 802                         err = sg_get_timeout(q);
 803                         break;
 804                 case SG_GET_RESERVED_SIZE:
 805                         err = sg_get_reserved_size(q, arg);
 806                         break;
 807                 case SG_SET_RESERVED_SIZE:
 808                         err = sg_set_reserved_size(q, arg);
 809                         break;
 810                 case SG_EMULATED_HOST:
 811                         err = sg_emulated_host(q, arg);
 812                         break;
 813                 case SG_IO: {
 814                         struct sg_io_hdr hdr;
 815
 816                         err = get_sg_io_hdr(&hdr, arg);
 817                         if (err)
 818                                 break;
 819                         err = sg_io(q, bd_disk, &hdr, mode);
 820                         if (err == -EFAULT)
 821                                 break;
 822
 823                         if (put_sg_io_hdr(&hdr, arg))
 824                                 err = -EFAULT;
 825                         break;
 826                 }
 827                 case CDROM_SEND_PACKET:
 828                         err = scsi_cdrom_send_packet(q, bd_disk, mode, arg);
 829                         break;
 830
 831                 /*
 832                  * old junk scsi send command ioctl
 833                  */
 834                 case SCSI_IOCTL_SEND_COMMAND:
 835                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 836                         err = -EINVAL;
 837                         if (!arg)
 838                                 break;
 839
 840                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 841                         break;
 842                 case CDROMCLOSETRAY:
 843                         err = blk_send_start_stop(q, bd_disk, 0x03);
 844                         break;
 845                 case CDROMEJECT:
 846                         err = blk_send_start_stop(q, bd_disk, 0x02);
 847                         break;
 848                 default:
 849                         err = -ENOTTY;
 850         }
 851
 852         return err;
 853 }
 854 EXPORT_SYMBOL(scsi_cmd_ioctl);
 855
 856 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 857 {
 858         if (bd && bd == bd->bd_contains)
 859                 return 0;
 860
 861         if (capable(CAP_SYS_RAWIO))
 862                 return 0;
 863
 864         return -ENOIOCTLCMD;
 865 }
 866 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 867
 868 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 869                        unsigned int cmd, void __user *arg)
 870 {
 871         int ret;
 872
 873         ret = scsi_verify_blk_ioctl(bd, cmd);
 874         if (ret < 0)
 875                 return ret;
 876
 877         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 878 }
 879 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 880
 881 /**
 882  * scsi_req_init - initialize certain fields of a scsi_request structure
 883  * @req: Pointer to a scsi_request structure.
 884  * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
 885  * of struct scsi_request.
 886  */
 887 void scsi_req_init(struct scsi_request *req)
 888 {
 889         memset(req->__cmd, 0, sizeof(req->__cmd));
 890         req->cmd = req->__cmd;
 891         req->cmd_len = BLK_MAX_CDB;
 892         req->sense_len = 0;
 893 }
 894 EXPORT_SYMBOL(scsi_req_init);
 895
 896 static int __init blk_scsi_ioctl_init(void)
 897 {
 898         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 899         return 0;
 900 }
 901 fs_initcall(blk_scsi_ioctl_init);