block/scsi_ioctl.c

   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 #include <linux/fd.h>
  33 #include <linux/raid/md_u.h>
  34 #include <linux/mtio.h>
  35
  36 #include <scsi/scsi.h>
  37 #include <scsi/scsi_ioctl.h>
  38 #include <scsi/scsi_cmnd.h>
  39
  40 struct blk_cmd_filter {
  41         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  42         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  43 };
  44
  45 static struct blk_cmd_filter blk_default_cmd_filter;
  46
  47 /* Command group 3 is reserved and should never be used.  */
  48 const unsigned char scsi_command_size_tbl[8] =
  49 {
  50         6, 10, 10, 12,
  51         16, 12, 10, 10
  52 };
  53 EXPORT_SYMBOL(scsi_command_size_tbl);
  54
  55 #include <scsi/sg.h>
  56
  57 static int sg_get_version(int __user *p)
  58 {
  59         static const int sg_version_num = 30527;
  60         return put_user(sg_version_num, p);
  61 }
  62
  63 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  64 {
  65         return put_user(0, p);
  66 }
  67
  68 static int scsi_get_bus(struct request_queue *q, int __user *p)
  69 {
  70         return put_user(0, p);
  71 }
  72
  73 static int sg_get_timeout(struct request_queue *q)
  74 {
  75         return jiffies_to_clock_t(q->sg_timeout);
  76 }
  77
  78 static int sg_set_timeout(struct request_queue *q, int __user *p)
  79 {
  80         int timeout, err = get_user(timeout, p);
  81
  82         if (!err)
  83                 q->sg_timeout = clock_t_to_jiffies(timeout);
  84
  85         return err;
  86 }
  87
  88 static int max_sectors_bytes(struct request_queue *q)
  89 {
  90         unsigned int max_sectors = queue_max_sectors(q);
  91
  92         max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
  93
  94         return max_sectors << 9;
  95 }
  96
  97 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  98 {
  99         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
 100
 101         return put_user(val, p);
 102 }
 103
 104 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
 105 {
 106         int size, err = get_user(size, p);
 107
 108         if (err)
 109                 return err;
 110
 111         if (size < 0)
 112                 return -EINVAL;
 113
 114         q->sg_reserved_size = min(size, max_sectors_bytes(q));
 115         return 0;
 116 }
 117
 118 /*
 119  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 120  * so sure this is worth doing anything about (why would you care??)
 121  */
 122 static int sg_emulated_host(struct request_queue *q, int __user *p)
 123 {
 124         return put_user(1, p);
 125 }
 126
 127 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 128 {
 129         /* Basic read-only commands */
 130         __set_bit(TEST_UNIT_READY, filter->read_ok);
 131         __set_bit(REQUEST_SENSE, filter->read_ok);
 132         __set_bit(READ_6, filter->read_ok);
 133         __set_bit(READ_10, filter->read_ok);
 134         __set_bit(READ_12, filter->read_ok);
 135         __set_bit(READ_16, filter->read_ok);
 136         __set_bit(READ_BUFFER, filter->read_ok);
 137         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 138         __set_bit(READ_CAPACITY, filter->read_ok);
 139         __set_bit(READ_LONG, filter->read_ok);
 140         __set_bit(INQUIRY, filter->read_ok);
 141         __set_bit(MODE_SENSE, filter->read_ok);
 142         __set_bit(MODE_SENSE_10, filter->read_ok);
 143         __set_bit(LOG_SENSE, filter->read_ok);
 144         __set_bit(START_STOP, filter->read_ok);
 145         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 146         __set_bit(VERIFY_16, filter->read_ok);
 147         __set_bit(REPORT_LUNS, filter->read_ok);
 148         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
 149         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 150         __set_bit(MAINTENANCE_IN, filter->read_ok);
 151         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 152
 153         /* Audio CD commands */
 154         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 155         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 156         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 157         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 158         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 159
 160         /* CD/DVD data reading */
 161         __set_bit(GPCMD_READ_CD, filter->read_ok);
 162         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 163         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 164         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 165         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 166         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 167         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 168         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 169         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 170         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 171         __set_bit(GPCMD_SCAN, filter->read_ok);
 172         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 173         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 174         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 175         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 176         __set_bit(GPCMD_SEEK, filter->read_ok);
 177         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 178
 179         /* Basic writing commands */
 180         __set_bit(WRITE_6, filter->write_ok);
 181         __set_bit(WRITE_10, filter->write_ok);
 182         __set_bit(WRITE_VERIFY, filter->write_ok);
 183         __set_bit(WRITE_12, filter->write_ok);
 184         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 185         __set_bit(WRITE_16, filter->write_ok);
 186         __set_bit(WRITE_LONG, filter->write_ok);
 187         __set_bit(WRITE_LONG_2, filter->write_ok);
 188         __set_bit(WRITE_SAME, filter->write_ok);
 189         __set_bit(WRITE_SAME_16, filter->write_ok);
 190         __set_bit(WRITE_SAME_32, filter->write_ok);
 191         __set_bit(ERASE, filter->write_ok);
 192         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 193         __set_bit(MODE_SELECT, filter->write_ok);
 194         __set_bit(LOG_SELECT, filter->write_ok);
 195         __set_bit(GPCMD_BLANK, filter->write_ok);
 196         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 197         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 198         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 199         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 200         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 201         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 202         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 203         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 204         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 205         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 206         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 207         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 208         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 209         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 210         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 211 }
 212
 213 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 214 {
 215         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 216
 217         /* root can do any command. */
 218         if (capable(CAP_SYS_RAWIO))
 219                 return 0;
 220
 221         /* Anybody who can open the device can do a read-safe command */
 222         if (test_bit(cmd[0], filter->read_ok))
 223                 return 0;
 224
 225         /* Write-safe commands require a writable open */
 226         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 227                 return 0;
 228
 229         return -EPERM;
 230 }
 231 EXPORT_SYMBOL(blk_verify_command);
 232
 233 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 234                              struct sg_io_hdr *hdr, fmode_t mode)
 235 {
 236         struct scsi_request *req = scsi_req(rq);
 237
 238         if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
 239                 return -EFAULT;
 240         if (blk_verify_command(req->cmd, mode & FMODE_WRITE))
 241                 return -EPERM;
 242
 243         /*
 244          * fill in request structure
 245          */
 246         req->cmd_len = hdr->cmd_len;
 247
 248         rq->timeout = msecs_to_jiffies(hdr->timeout);
 249         if (!rq->timeout)
 250                 rq->timeout = q->sg_timeout;
 251         if (!rq->timeout)
 252                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 253         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 254                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 255
 256         return 0;
 257 }
 258
 259 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 260                                  struct bio *bio)
 261 {
 262         struct scsi_request *req = scsi_req(rq);
 263         int r, ret = 0;
 264
 265         /*
 266          * fill in all the output members
 267          */
 268         hdr->status = req->result & 0xff;
 269         hdr->masked_status = status_byte(req->result);
 270         hdr->msg_status = msg_byte(req->result);
 271         hdr->host_status = host_byte(req->result);
 272         hdr->driver_status = driver_byte(req->result);
 273         hdr->info = 0;
 274         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 275                 hdr->info |= SG_INFO_CHECK;
 276         hdr->resid = req->resid_len;
 277         hdr->sb_len_wr = 0;
 278
 279         if (req->sense_len && hdr->sbp) {
 280                 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
 281
 282                 if (!copy_to_user(hdr->sbp, req->sense, len))
 283                         hdr->sb_len_wr = len;
 284                 else
 285                         ret = -EFAULT;
 286         }
 287
 288         r = blk_rq_unmap_user(bio);
 289         if (!ret)
 290                 ret = r;
 291
 292         return ret;
 293 }
 294
 295 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 296                 struct sg_io_hdr *hdr, fmode_t mode)
 297 {
 298         unsigned long start_time;
 299         ssize_t ret = 0;
 300         int writing = 0;
 301         int at_head = 0;
 302         struct request *rq;
 303         struct scsi_request *req;
 304         struct bio *bio;
 305
 306         if (hdr->interface_id != 'S')
 307                 return -EINVAL;
 308
 309         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 310                 return -EIO;
 311
 312         if (hdr->dxfer_len)
 313                 switch (hdr->dxfer_direction) {
 314                 default:
 315                         return -EINVAL;
 316                 case SG_DXFER_TO_DEV:
 317                         writing = 1;
 318                         break;
 319                 case SG_DXFER_TO_FROM_DEV:
 320                 case SG_DXFER_FROM_DEV:
 321                         break;
 322                 }
 323         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
 324                 at_head = 1;
 325
 326         ret = -ENOMEM;
 327         rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
 328                         GFP_KERNEL);
 329         if (IS_ERR(rq))
 330                 return PTR_ERR(rq);
 331         req = scsi_req(rq);
 332
 333         if (hdr->cmd_len > BLK_MAX_CDB) {
 334                 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
 335                 if (!req->cmd)
 336                         goto out_put_request;
 337         }
 338
 339         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
 340         if (ret < 0)
 341                 goto out_free_cdb;
 342
 343         ret = 0;
 344         if (hdr->iovec_count) {
 345                 struct iov_iter i;
 346                 struct iovec *iov = NULL;
 347
 348                 ret = import_iovec(rq_data_dir(rq),
 349                                    hdr->dxferp, hdr->iovec_count,
 350                                    0, &iov, &i);
 351                 if (ret < 0)
 352                         goto out_free_cdb;
 353
 354                 /* SG_IO howto says that the shorter of the two wins */
 355                 iov_iter_truncate(&i, hdr->dxfer_len);
 356
 357                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
 358                 kfree(iov);
 359         } else if (hdr->dxfer_len)
 360                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 361                                       GFP_KERNEL);
 362
 363         if (ret)
 364                 goto out_free_cdb;
 365
 366         bio = rq->bio;
 367         req->retries = 0;
 368
 369         start_time = jiffies;
 370
 371         /* ignore return value. All information is passed back to caller
 372          * (if he doesn't check that is his problem).
 373          * N.B. a non-zero SCSI status is _not_ necessarily an error.
 374          */
 375         blk_execute_rq(q, bd_disk, rq, at_head);
 376
 377         hdr->duration = jiffies_to_msecs(jiffies - start_time);
 378
 379         ret = blk_complete_sghdr_rq(rq, hdr, bio);
 380
 381 out_free_cdb:
 382         scsi_req_free_cmd(req);
 383 out_put_request:
 384         blk_put_request(rq);
 385         return ret;
 386 }
 387
 388 /**
 389  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 390  * @file:       file this ioctl operates on (optional)
 391  * @q:          request queue to send scsi commands down
 392  * @disk:       gendisk to operate on (option)
 393  * @sic:        userspace structure describing the command to perform
 394  *
 395  * Send down the scsi command described by @sic to the device below
 396  * the request queue @q.  If @file is non-NULL it's used to perform
 397  * fine-grained permission checks that allow users to send down
 398  * non-destructive SCSI commands.  If the caller has a struct gendisk
 399  * available it should be passed in as @disk to allow the low level
 400  * driver to use the information contained in it.  A non-NULL @disk
 401  * is only allowed if the caller knows that the low level driver doesn't
 402  * need it (e.g. in the scsi subsystem).
 403  *
 404  * Notes:
 405  *   -  This interface is deprecated - users should use the SG_IO
 406  *      interface instead, as this is a more flexible approach to
 407  *      performing SCSI commands on a device.
 408  *   -  The SCSI command length is determined by examining the 1st byte
 409  *      of the given command. There is no way to override this.
 410  *   -  Data transfers are limited to PAGE_SIZE
 411  *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 412  *      accommodate the sense buffer when an error occurs.
 413  *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 414  *      old code will not be surprised.
 415  *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 416  *      a negative return and the Unix error code in 'errno'.
 417  *      If the SCSI command succeeds then 0 is returned.
 418  *      Positive numbers returned are the compacted SCSI error codes (4
 419  *      bytes in one int) where the lowest byte is the SCSI status.
 420  */
 421 #define OMAX_SB_LEN 16          /* For backward compatibility */
 422 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 423                 struct scsi_ioctl_command __user *sic)
 424 {
 425         struct request *rq;
 426         struct scsi_request *req;
 427         int err;
 428         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 429         char *buffer = NULL;
 430
 431         if (!sic)
 432                 return -EINVAL;
 433
 434         /*
 435          * get in an out lengths, verify they don't exceed a page worth of data
 436          */
 437         if (get_user(in_len, &sic->inlen))
 438                 return -EFAULT;
 439         if (get_user(out_len, &sic->outlen))
 440                 return -EFAULT;
 441         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 442                 return -EINVAL;
 443         if (get_user(opcode, sic->data))
 444                 return -EFAULT;
 445
 446         bytes = max(in_len, out_len);
 447         if (bytes) {
 448                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 449                 if (!buffer)
 450                         return -ENOMEM;
 451
 452         }
 453
 454         rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN,
 455                         __GFP_RECLAIM);
 456         if (IS_ERR(rq)) {
 457                 err = PTR_ERR(rq);
 458                 goto error_free_buffer;
 459         }
 460         req = scsi_req(rq);
 461
 462         cmdlen = COMMAND_SIZE(opcode);
 463
 464         /*
 465          * get command and data to send to device, if any
 466          */
 467         err = -EFAULT;
 468         req->cmd_len = cmdlen;
 469         if (copy_from_user(req->cmd, sic->data, cmdlen))
 470                 goto error;
 471
 472         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 473                 goto error;
 474
 475         err = blk_verify_command(req->cmd, mode & FMODE_WRITE);
 476         if (err)
 477                 goto error;
 478
 479         /* default.  possible overriden later */
 480         req->retries = 5;
 481
 482         switch (opcode) {
 483         case SEND_DIAGNOSTIC:
 484         case FORMAT_UNIT:
 485                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 486                 req->retries = 1;
 487                 break;
 488         case START_STOP:
 489                 rq->timeout = START_STOP_TIMEOUT;
 490                 break;
 491         case MOVE_MEDIUM:
 492                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 493                 break;
 494         case READ_ELEMENT_STATUS:
 495                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 496                 break;
 497         case READ_DEFECT_DATA:
 498                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 499                 req->retries = 1;
 500                 break;
 501         default:
 502                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 503                 break;
 504         }
 505
 506         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
 507                 err = DRIVER_ERROR << 24;
 508                 goto error;
 509         }
 510
 511         blk_execute_rq(q, disk, rq, 0);
 512
 513         err = req->result & 0xff;       /* only 8 bit SCSI status */
 514         if (err) {
 515                 if (req->sense_len && req->sense) {
 516                         bytes = (OMAX_SB_LEN > req->sense_len) ?
 517                                 req->sense_len : OMAX_SB_LEN;
 518                         if (copy_to_user(sic->data, req->sense, bytes))
 519                                 err = -EFAULT;
 520                 }
 521         } else {
 522                 if (copy_to_user(sic->data, buffer, out_len))
 523                         err = -EFAULT;
 524         }
 525
 526 error:
 527         blk_put_request(rq);
 528
 529 error_free_buffer:
 530         kfree(buffer);
 531
 532         return err;
 533 }
 534 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 535
 536 /* Send basic block requests */
 537 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 538                               int cmd, int data)
 539 {
 540         struct request *rq;
 541         int err;
 542
 543         rq = blk_get_request(q, REQ_OP_SCSI_OUT, __GFP_RECLAIM);
 544         if (IS_ERR(rq))
 545                 return PTR_ERR(rq);
 546         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 547         scsi_req(rq)->cmd[0] = cmd;
 548         scsi_req(rq)->cmd[4] = data;
 549         scsi_req(rq)->cmd_len = 6;
 550         blk_execute_rq(q, bd_disk, rq, 0);
 551         err = scsi_req(rq)->result ? -EIO : 0;
 552         blk_put_request(rq);
 553
 554         return err;
 555 }
 556
 557 static inline int blk_send_start_stop(struct request_queue *q,
 558                                       struct gendisk *bd_disk, int data)
 559 {
 560         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 561 }
 562
 563 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 564                    unsigned int cmd, void __user *arg)
 565 {
 566         int err;
 567
 568         if (!q)
 569                 return -ENXIO;
 570
 571         switch (cmd) {
 572                 /*
 573                  * new sgv3 interface
 574                  */
 575                 case SG_GET_VERSION_NUM:
 576                         err = sg_get_version(arg);
 577                         break;
 578                 case SCSI_IOCTL_GET_IDLUN:
 579                         err = scsi_get_idlun(q, arg);
 580                         break;
 581                 case SCSI_IOCTL_GET_BUS_NUMBER:
 582                         err = scsi_get_bus(q, arg);
 583                         break;
 584                 case SG_SET_TIMEOUT:
 585                         err = sg_set_timeout(q, arg);
 586                         break;
 587                 case SG_GET_TIMEOUT:
 588                         err = sg_get_timeout(q);
 589                         break;
 590                 case SG_GET_RESERVED_SIZE:
 591                         err = sg_get_reserved_size(q, arg);
 592                         break;
 593                 case SG_SET_RESERVED_SIZE:
 594                         err = sg_set_reserved_size(q, arg);
 595                         break;
 596                 case SG_EMULATED_HOST:
 597                         err = sg_emulated_host(q, arg);
 598                         break;
 599                 case SG_IO: {
 600                         struct sg_io_hdr hdr;
 601
 602                         err = -EFAULT;
 603                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 604                                 break;
 605                         err = sg_io(q, bd_disk, &hdr, mode);
 606                         if (err == -EFAULT)
 607                                 break;
 608
 609                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 610                                 err = -EFAULT;
 611                         break;
 612                 }
 613                 case CDROM_SEND_PACKET: {
 614                         struct cdrom_generic_command cgc;
 615                         struct sg_io_hdr hdr;
 616
 617                         err = -EFAULT;
 618                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 619                                 break;
 620                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 621                         memset(&hdr, 0, sizeof(hdr));
 622                         hdr.interface_id = 'S';
 623                         hdr.cmd_len = sizeof(cgc.cmd);
 624                         hdr.dxfer_len = cgc.buflen;
 625                         err = 0;
 626                         switch (cgc.data_direction) {
 627                                 case CGC_DATA_UNKNOWN:
 628                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 629                                         break;
 630                                 case CGC_DATA_WRITE:
 631                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 632                                         break;
 633                                 case CGC_DATA_READ:
 634                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 635                                         break;
 636                                 case CGC_DATA_NONE:
 637                                         hdr.dxfer_direction = SG_DXFER_NONE;
 638                                         break;
 639                                 default:
 640                                         err = -EINVAL;
 641                         }
 642                         if (err)
 643                                 break;
 644
 645                         hdr.dxferp = cgc.buffer;
 646                         hdr.sbp = cgc.sense;
 647                         if (hdr.sbp)
 648                                 hdr.mx_sb_len = sizeof(struct request_sense);
 649                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 650                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 651                         hdr.cmd_len = sizeof(cgc.cmd);
 652
 653                         err = sg_io(q, bd_disk, &hdr, mode);
 654                         if (err == -EFAULT)
 655                                 break;
 656
 657                         if (hdr.status)
 658                                 err = -EIO;
 659
 660                         cgc.stat = err;
 661                         cgc.buflen = hdr.resid;
 662                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 663                                 err = -EFAULT;
 664
 665                         break;
 666                 }
 667
 668                 /*
 669                  * old junk scsi send command ioctl
 670                  */
 671                 case SCSI_IOCTL_SEND_COMMAND:
 672                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 673                         err = -EINVAL;
 674                         if (!arg)
 675                                 break;
 676
 677                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 678                         break;
 679                 case CDROMCLOSETRAY:
 680                         err = blk_send_start_stop(q, bd_disk, 0x03);
 681                         break;
 682                 case CDROMEJECT:
 683                         err = blk_send_start_stop(q, bd_disk, 0x02);
 684                         break;
 685                 default:
 686                         err = -ENOTTY;
 687         }
 688
 689         return err;
 690 }
 691 EXPORT_SYMBOL(scsi_cmd_ioctl);
 692
 693 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 694 {
 695         if (bd && bd == bd->bd_contains)
 696                 return 0;
 697
 698         /* Actually none of these is particularly useful on a partition,
 699          * but they are safe.
 700          */
 701         switch (cmd) {
 702         case SCSI_IOCTL_GET_IDLUN:
 703         case SCSI_IOCTL_GET_BUS_NUMBER:
 704         case SCSI_IOCTL_GET_PCI:
 705         case SCSI_IOCTL_PROBE_HOST:
 706         case SG_GET_VERSION_NUM:
 707         case SG_SET_TIMEOUT:
 708         case SG_GET_TIMEOUT:
 709         case SG_GET_RESERVED_SIZE:
 710         case SG_SET_RESERVED_SIZE:
 711         case SG_EMULATED_HOST:
 712         case BLKFLSBUF:
 713         case BLKROSET:
 714                 return 0;
 715         case CDROM_GET_CAPABILITY:
 716         case CDROM_DRIVE_STATUS:
 717         case FDGETPRM:
 718         case RAID_VERSION:
 719         case MTIOCGET:
 720 #ifdef CONFIG_COMPAT
 721         case 0x801c6d02:        /* MTIOCGET32 */
 722 #endif
 723                 /* Keep this until we remove the printk below.  udev sends it
 724                  * and we do not want to spam dmesg about it.   CD-ROMs do
 725                  * not have partitions, so we get here only for disks.
 726                  */
 727                 return -ENOIOCTLCMD;
 728         default:
 729                 break;
 730         }
 731
 732         if (capable(CAP_SYS_RAWIO))
 733                 return 0;
 734
 735         /* In particular, rule out all resets and host-specific ioctls.  */
 736         printk_ratelimited(KERN_WARNING
 737                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 738
 739         return -ENOIOCTLCMD;
 740 }
 741 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 742
 743 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 744                        unsigned int cmd, void __user *arg)
 745 {
 746         int ret;
 747
 748         ret = scsi_verify_blk_ioctl(bd, cmd);
 749         if (ret < 0)
 750                 return ret;
 751
 752         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 753 }
 754 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 755
 756 /**
 757  * scsi_req_init - initialize certain fields of a scsi_request structure
 758  * @req: Pointer to a scsi_request structure.
 759  * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
 760  * of struct scsi_request.
 761  */
 762 void scsi_req_init(struct scsi_request *req)
 763 {
 764         memset(req->__cmd, 0, sizeof(req->__cmd));
 765         req->cmd = req->__cmd;
 766         req->cmd_len = BLK_MAX_CDB;
 767         req->sense_len = 0;
 768 }
 769 EXPORT_SYMBOL(scsi_req_init);
 770
 771 static int __init blk_scsi_ioctl_init(void)
 772 {
 773         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 774         return 0;
 775 }
 776 fs_initcall(blk_scsi_ioctl_init);