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 <asm/uaccess.h>
  32
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_ioctl.h>
  35 #include <scsi/scsi_cmnd.h>
  36
  37 struct blk_cmd_filter {
  38         unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
  39         unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
  40 };
  41
  42 static struct blk_cmd_filter blk_default_cmd_filter;
  43
  44 /* Command group 3 is reserved and should never be used.  */
  45 const unsigned char scsi_command_size_tbl[8] =
  46 {
  47         6, 10, 10, 12,
  48         16, 12, 10, 10
  49 };
  50 EXPORT_SYMBOL(scsi_command_size_tbl);
  51
  52 #include <scsi/sg.h>
  53
  54 static int sg_get_version(int __user *p)
  55 {
  56         static const int sg_version_num = 30527;
  57         return put_user(sg_version_num, p);
  58 }
  59
  60 static int scsi_get_idlun(struct request_queue *q, int __user *p)
  61 {
  62         return put_user(0, p);
  63 }
  64
  65 static int scsi_get_bus(struct request_queue *q, int __user *p)
  66 {
  67         return put_user(0, p);
  68 }
  69
  70 static int sg_get_timeout(struct request_queue *q)
  71 {
  72         return jiffies_to_clock_t(q->sg_timeout);
  73 }
  74
  75 static int sg_set_timeout(struct request_queue *q, int __user *p)
  76 {
  77         int timeout, err = get_user(timeout, p);
  78
  79         if (!err)
  80                 q->sg_timeout = clock_t_to_jiffies(timeout);
  81
  82         return err;
  83 }
  84
  85 static int max_sectors_bytes(struct request_queue *q)
  86 {
  87         unsigned int max_sectors = queue_max_sectors(q);
  88
  89         max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
  90
  91         return max_sectors << 9;
  92 }
  93
  94 static int sg_get_reserved_size(struct request_queue *q, int __user *p)
  95 {
  96         int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
  97
  98         return put_user(val, p);
  99 }
 100
 101 static int sg_set_reserved_size(struct request_queue *q, int __user *p)
 102 {
 103         int size, err = get_user(size, p);
 104
 105         if (err)
 106                 return err;
 107
 108         if (size < 0)
 109                 return -EINVAL;
 110
 111         q->sg_reserved_size = min(size, max_sectors_bytes(q));
 112         return 0;
 113 }
 114
 115 /*
 116  * will always return that we are ATAPI even for a real SCSI drive, I'm not
 117  * so sure this is worth doing anything about (why would you care??)
 118  */
 119 static int sg_emulated_host(struct request_queue *q, int __user *p)
 120 {
 121         return put_user(1, p);
 122 }
 123
 124 static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 125 {
 126         /* Basic read-only commands */
 127         __set_bit(TEST_UNIT_READY, filter->read_ok);
 128         __set_bit(REQUEST_SENSE, filter->read_ok);
 129         __set_bit(READ_6, filter->read_ok);
 130         __set_bit(READ_10, filter->read_ok);
 131         __set_bit(READ_12, filter->read_ok);
 132         __set_bit(READ_16, filter->read_ok);
 133         __set_bit(READ_BUFFER, filter->read_ok);
 134         __set_bit(READ_DEFECT_DATA, filter->read_ok);
 135         __set_bit(READ_CAPACITY, filter->read_ok);
 136         __set_bit(READ_LONG, filter->read_ok);
 137         __set_bit(INQUIRY, filter->read_ok);
 138         __set_bit(MODE_SENSE, filter->read_ok);
 139         __set_bit(MODE_SENSE_10, filter->read_ok);
 140         __set_bit(LOG_SENSE, filter->read_ok);
 141         __set_bit(START_STOP, filter->read_ok);
 142         __set_bit(GPCMD_VERIFY_10, filter->read_ok);
 143         __set_bit(VERIFY_16, filter->read_ok);
 144         __set_bit(REPORT_LUNS, filter->read_ok);
 145         __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
 146         __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
 147         __set_bit(MAINTENANCE_IN, filter->read_ok);
 148         __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
 149
 150         /* Audio CD commands */
 151         __set_bit(GPCMD_PLAY_CD, filter->read_ok);
 152         __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
 153         __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
 154         __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
 155         __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
 156
 157         /* CD/DVD data reading */
 158         __set_bit(GPCMD_READ_CD, filter->read_ok);
 159         __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
 160         __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
 161         __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
 162         __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
 163         __set_bit(GPCMD_READ_HEADER, filter->read_ok);
 164         __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
 165         __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
 166         __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
 167         __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
 168         __set_bit(GPCMD_SCAN, filter->read_ok);
 169         __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
 170         __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
 171         __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
 172         __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
 173         __set_bit(GPCMD_SEEK, filter->read_ok);
 174         __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
 175
 176         /* Basic writing commands */
 177         __set_bit(WRITE_6, filter->write_ok);
 178         __set_bit(WRITE_10, filter->write_ok);
 179         __set_bit(WRITE_VERIFY, filter->write_ok);
 180         __set_bit(WRITE_12, filter->write_ok);
 181         __set_bit(WRITE_VERIFY_12, filter->write_ok);
 182         __set_bit(WRITE_16, filter->write_ok);
 183         __set_bit(WRITE_LONG, filter->write_ok);
 184         __set_bit(WRITE_LONG_2, filter->write_ok);
 185         __set_bit(ERASE, filter->write_ok);
 186         __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 187         __set_bit(MODE_SELECT, filter->write_ok);
 188         __set_bit(LOG_SELECT, filter->write_ok);
 189         __set_bit(GPCMD_BLANK, filter->write_ok);
 190         __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
 191         __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
 192         __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
 193         __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
 194         __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
 195         __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
 196         __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
 197         __set_bit(GPCMD_SEND_KEY, filter->write_ok);
 198         __set_bit(GPCMD_SEND_OPC, filter->write_ok);
 199         __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
 200         __set_bit(GPCMD_SET_SPEED, filter->write_ok);
 201         __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
 202         __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
 203         __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
 204         __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
 205 }
 206
 207 int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
 208 {
 209         struct blk_cmd_filter *filter = &blk_default_cmd_filter;
 210
 211         /* root can do any command. */
 212         if (capable(CAP_SYS_RAWIO))
 213                 return 0;
 214
 215         /* Anybody who can open the device can do a read-safe command */
 216         if (test_bit(cmd[0], filter->read_ok))
 217                 return 0;
 218
 219         /* Write-safe commands require a writable open */
 220         if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
 221                 return 0;
 222
 223         return -EPERM;
 224 }
 225 EXPORT_SYMBOL(blk_verify_command);
 226
 227 static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
 228                              struct sg_io_hdr *hdr, fmode_t mode)
 229 {
 230         if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
 231                 return -EFAULT;
 232         if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
 233                 return -EPERM;
 234
 235         /*
 236          * fill in request structure
 237          */
 238         rq->cmd_len = hdr->cmd_len;
 239
 240         rq->timeout = msecs_to_jiffies(hdr->timeout);
 241         if (!rq->timeout)
 242                 rq->timeout = q->sg_timeout;
 243         if (!rq->timeout)
 244                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 245         if (rq->timeout < BLK_MIN_SG_TIMEOUT)
 246                 rq->timeout = BLK_MIN_SG_TIMEOUT;
 247
 248         return 0;
 249 }
 250
 251 static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 252                                  struct bio *bio)
 253 {
 254         int r, ret = 0;
 255
 256         /*
 257          * fill in all the output members
 258          */
 259         hdr->status = rq->errors & 0xff;
 260         hdr->masked_status = status_byte(rq->errors);
 261         hdr->msg_status = msg_byte(rq->errors);
 262         hdr->host_status = host_byte(rq->errors);
 263         hdr->driver_status = driver_byte(rq->errors);
 264         hdr->info = 0;
 265         if (hdr->masked_status || hdr->host_status || hdr->driver_status)
 266                 hdr->info |= SG_INFO_CHECK;
 267         hdr->resid = rq->resid_len;
 268         hdr->sb_len_wr = 0;
 269
 270         if (rq->sense_len && hdr->sbp) {
 271                 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
 272
 273                 if (!copy_to_user(hdr->sbp, rq->sense, len))
 274                         hdr->sb_len_wr = len;
 275                 else
 276                         ret = -EFAULT;
 277         }
 278
 279         r = blk_rq_unmap_user(bio);
 280         if (!ret)
 281                 ret = r;
 282
 283         return ret;
 284 }
 285
 286 static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 287                 struct sg_io_hdr *hdr, fmode_t mode)
 288 {
 289         unsigned long start_time;
 290         ssize_t ret = 0;
 291         int writing = 0;
 292         int at_head = 0;
 293         struct request *rq;
 294         char sense[SCSI_SENSE_BUFFERSIZE];
 295         struct bio *bio;
 296
 297         if (hdr->interface_id != 'S')
 298                 return -EINVAL;
 299
 300         if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
 301                 return -EIO;
 302
 303         if (hdr->dxfer_len)
 304                 switch (hdr->dxfer_direction) {
 305                 default:
 306                         return -EINVAL;
 307                 case SG_DXFER_TO_DEV:
 308                         writing = 1;
 309                         break;
 310                 case SG_DXFER_TO_FROM_DEV:
 311                 case SG_DXFER_FROM_DEV:
 312                         break;
 313                 }
 314         if (hdr->flags & SG_FLAG_Q_AT_HEAD)
 315                 at_head = 1;
 316
 317         ret = -ENOMEM;
 318         rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
 319         if (IS_ERR(rq))
 320                 return PTR_ERR(rq);
 321         blk_rq_set_block_pc(rq);
 322
 323         if (hdr->cmd_len > BLK_MAX_CDB) {
 324                 rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
 325                 if (!rq->cmd)
 326                         goto out_put_request;
 327         }
 328
 329         ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
 330         if (ret < 0)
 331                 goto out_free_cdb;
 332
 333         ret = 0;
 334         if (hdr->iovec_count) {
 335                 struct iov_iter i;
 336                 struct iovec *iov = NULL;
 337
 338                 ret = import_iovec(rq_data_dir(rq),
 339                                    hdr->dxferp, hdr->iovec_count,
 340                                    0, &iov, &i);
 341                 if (ret < 0)
 342                         goto out_free_cdb;
 343
 344                 /* SG_IO howto says that the shorter of the two wins */
 345                 iov_iter_truncate(&i, hdr->dxfer_len);
 346
 347                 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
 348                 kfree(iov);
 349         } else if (hdr->dxfer_len)
 350                 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
 351                                       GFP_KERNEL);
 352
 353         if (ret)
 354                 goto out_free_cdb;
 355
 356         bio = rq->bio;
 357         memset(sense, 0, sizeof(sense));
 358         rq->sense = sense;
 359         rq->sense_len = 0;
 360         rq->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         if (rq->cmd != rq->__cmd)
 376                 kfree(rq->cmd);
 377 out_put_request:
 378         blk_put_request(rq);
 379         return ret;
 380 }
 381
 382 /**
 383  * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 384  * @file:       file this ioctl operates on (optional)
 385  * @q:          request queue to send scsi commands down
 386  * @disk:       gendisk to operate on (option)
 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 #define OMAX_SB_LEN 16          /* For backward compatibility */
 416 int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
 417                 struct scsi_ioctl_command __user *sic)
 418 {
 419         struct request *rq;
 420         int err;
 421         unsigned int in_len, out_len, bytes, opcode, cmdlen;
 422         char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
 423
 424         if (!sic)
 425                 return -EINVAL;
 426
 427         /*
 428          * get in an out lengths, verify they don't exceed a page worth of data
 429          */
 430         if (get_user(in_len, &sic->inlen))
 431                 return -EFAULT;
 432         if (get_user(out_len, &sic->outlen))
 433                 return -EFAULT;
 434         if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
 435                 return -EINVAL;
 436         if (get_user(opcode, sic->data))
 437                 return -EFAULT;
 438
 439         bytes = max(in_len, out_len);
 440         if (bytes) {
 441                 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
 442                 if (!buffer)
 443                         return -ENOMEM;
 444
 445         }
 446
 447         rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_RECLAIM);
 448         if (IS_ERR(rq)) {
 449                 err = PTR_ERR(rq);
 450                 goto error_free_buffer;
 451         }
 452         blk_rq_set_block_pc(rq);
 453
 454         cmdlen = COMMAND_SIZE(opcode);
 455
 456         /*
 457          * get command and data to send to device, if any
 458          */
 459         err = -EFAULT;
 460         rq->cmd_len = cmdlen;
 461         if (copy_from_user(rq->cmd, sic->data, cmdlen))
 462                 goto error;
 463
 464         if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
 465                 goto error;
 466
 467         err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
 468         if (err)
 469                 goto error;
 470
 471         /* default.  possible overriden later */
 472         rq->retries = 5;
 473
 474         switch (opcode) {
 475         case SEND_DIAGNOSTIC:
 476         case FORMAT_UNIT:
 477                 rq->timeout = FORMAT_UNIT_TIMEOUT;
 478                 rq->retries = 1;
 479                 break;
 480         case START_STOP:
 481                 rq->timeout = START_STOP_TIMEOUT;
 482                 break;
 483         case MOVE_MEDIUM:
 484                 rq->timeout = MOVE_MEDIUM_TIMEOUT;
 485                 break;
 486         case READ_ELEMENT_STATUS:
 487                 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
 488                 break;
 489         case READ_DEFECT_DATA:
 490                 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
 491                 rq->retries = 1;
 492                 break;
 493         default:
 494                 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 495                 break;
 496         }
 497
 498         if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
 499                 err = DRIVER_ERROR << 24;
 500                 goto error;
 501         }
 502
 503         memset(sense, 0, sizeof(sense));
 504         rq->sense = sense;
 505         rq->sense_len = 0;
 506
 507         blk_execute_rq(q, disk, rq, 0);
 508
 509         err = rq->errors & 0xff;        /* only 8 bit SCSI status */
 510         if (err) {
 511                 if (rq->sense_len && rq->sense) {
 512                         bytes = (OMAX_SB_LEN > rq->sense_len) ?
 513                                 rq->sense_len : OMAX_SB_LEN;
 514                         if (copy_to_user(sic->data, rq->sense, bytes))
 515                                 err = -EFAULT;
 516                 }
 517         } else {
 518                 if (copy_to_user(sic->data, buffer, out_len))
 519                         err = -EFAULT;
 520         }
 521
 522 error:
 523         blk_put_request(rq);
 524
 525 error_free_buffer:
 526         kfree(buffer);
 527
 528         return err;
 529 }
 530 EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
 531
 532 /* Send basic block requests */
 533 static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
 534                               int cmd, int data)
 535 {
 536         struct request *rq;
 537         int err;
 538
 539         rq = blk_get_request(q, WRITE, __GFP_RECLAIM);
 540         if (IS_ERR(rq))
 541                 return PTR_ERR(rq);
 542         blk_rq_set_block_pc(rq);
 543         rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
 544         rq->cmd[0] = cmd;
 545         rq->cmd[4] = data;
 546         rq->cmd_len = 6;
 547         err = blk_execute_rq(q, bd_disk, rq, 0);
 548         blk_put_request(rq);
 549
 550         return err;
 551 }
 552
 553 static inline int blk_send_start_stop(struct request_queue *q,
 554                                       struct gendisk *bd_disk, int data)
 555 {
 556         return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
 557 }
 558
 559 int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
 560                    unsigned int cmd, void __user *arg)
 561 {
 562         int err;
 563
 564         if (!q)
 565                 return -ENXIO;
 566
 567         switch (cmd) {
 568                 /*
 569                  * new sgv3 interface
 570                  */
 571                 case SG_GET_VERSION_NUM:
 572                         err = sg_get_version(arg);
 573                         break;
 574                 case SCSI_IOCTL_GET_IDLUN:
 575                         err = scsi_get_idlun(q, arg);
 576                         break;
 577                 case SCSI_IOCTL_GET_BUS_NUMBER:
 578                         err = scsi_get_bus(q, arg);
 579                         break;
 580                 case SG_SET_TIMEOUT:
 581                         err = sg_set_timeout(q, arg);
 582                         break;
 583                 case SG_GET_TIMEOUT:
 584                         err = sg_get_timeout(q);
 585                         break;
 586                 case SG_GET_RESERVED_SIZE:
 587                         err = sg_get_reserved_size(q, arg);
 588                         break;
 589                 case SG_SET_RESERVED_SIZE:
 590                         err = sg_set_reserved_size(q, arg);
 591                         break;
 592                 case SG_EMULATED_HOST:
 593                         err = sg_emulated_host(q, arg);
 594                         break;
 595                 case SG_IO: {
 596                         struct sg_io_hdr hdr;
 597
 598                         err = -EFAULT;
 599                         if (copy_from_user(&hdr, arg, sizeof(hdr)))
 600                                 break;
 601                         err = sg_io(q, bd_disk, &hdr, mode);
 602                         if (err == -EFAULT)
 603                                 break;
 604
 605                         if (copy_to_user(arg, &hdr, sizeof(hdr)))
 606                                 err = -EFAULT;
 607                         break;
 608                 }
 609                 case CDROM_SEND_PACKET: {
 610                         struct cdrom_generic_command cgc;
 611                         struct sg_io_hdr hdr;
 612
 613                         err = -EFAULT;
 614                         if (copy_from_user(&cgc, arg, sizeof(cgc)))
 615                                 break;
 616                         cgc.timeout = clock_t_to_jiffies(cgc.timeout);
 617                         memset(&hdr, 0, sizeof(hdr));
 618                         hdr.interface_id = 'S';
 619                         hdr.cmd_len = sizeof(cgc.cmd);
 620                         hdr.dxfer_len = cgc.buflen;
 621                         err = 0;
 622                         switch (cgc.data_direction) {
 623                                 case CGC_DATA_UNKNOWN:
 624                                         hdr.dxfer_direction = SG_DXFER_UNKNOWN;
 625                                         break;
 626                                 case CGC_DATA_WRITE:
 627                                         hdr.dxfer_direction = SG_DXFER_TO_DEV;
 628                                         break;
 629                                 case CGC_DATA_READ:
 630                                         hdr.dxfer_direction = SG_DXFER_FROM_DEV;
 631                                         break;
 632                                 case CGC_DATA_NONE:
 633                                         hdr.dxfer_direction = SG_DXFER_NONE;
 634                                         break;
 635                                 default:
 636                                         err = -EINVAL;
 637                         }
 638                         if (err)
 639                                 break;
 640
 641                         hdr.dxferp = cgc.buffer;
 642                         hdr.sbp = cgc.sense;
 643                         if (hdr.sbp)
 644                                 hdr.mx_sb_len = sizeof(struct request_sense);
 645                         hdr.timeout = jiffies_to_msecs(cgc.timeout);
 646                         hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
 647                         hdr.cmd_len = sizeof(cgc.cmd);
 648
 649                         err = sg_io(q, bd_disk, &hdr, mode);
 650                         if (err == -EFAULT)
 651                                 break;
 652
 653                         if (hdr.status)
 654                                 err = -EIO;
 655
 656                         cgc.stat = err;
 657                         cgc.buflen = hdr.resid;
 658                         if (copy_to_user(arg, &cgc, sizeof(cgc)))
 659                                 err = -EFAULT;
 660
 661                         break;
 662                 }
 663
 664                 /*
 665                  * old junk scsi send command ioctl
 666                  */
 667                 case SCSI_IOCTL_SEND_COMMAND:
 668                         printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
 669                         err = -EINVAL;
 670                         if (!arg)
 671                                 break;
 672
 673                         err = sg_scsi_ioctl(q, bd_disk, mode, arg);
 674                         break;
 675                 case CDROMCLOSETRAY:
 676                         err = blk_send_start_stop(q, bd_disk, 0x03);
 677                         break;
 678                 case CDROMEJECT:
 679                         err = blk_send_start_stop(q, bd_disk, 0x02);
 680                         break;
 681                 default:
 682                         err = -ENOTTY;
 683         }
 684
 685         return err;
 686 }
 687 EXPORT_SYMBOL(scsi_cmd_ioctl);
 688
 689 int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
 690 {
 691         if (bd && bd == bd->bd_contains)
 692                 return 0;
 693
 694         /* Actually none of these is particularly useful on a partition,
 695          * but they are safe.
 696          */
 697         switch (cmd) {
 698         case SCSI_IOCTL_GET_IDLUN:
 699         case SCSI_IOCTL_GET_BUS_NUMBER:
 700         case SCSI_IOCTL_GET_PCI:
 701         case SCSI_IOCTL_PROBE_HOST:
 702         case SG_GET_VERSION_NUM:
 703         case SG_SET_TIMEOUT:
 704         case SG_GET_TIMEOUT:
 705         case SG_GET_RESERVED_SIZE:
 706         case SG_SET_RESERVED_SIZE:
 707         case SG_EMULATED_HOST:
 708                 return 0;
 709         case CDROM_GET_CAPABILITY:
 710                 /* Keep this until we remove the printk below.  udev sends it
 711                  * and we do not want to spam dmesg about it.   CD-ROMs do
 712                  * not have partitions, so we get here only for disks.
 713                  */
 714                 return -ENOIOCTLCMD;
 715         default:
 716                 break;
 717         }
 718
 719         if (capable(CAP_SYS_RAWIO))
 720                 return 0;
 721
 722         /* In particular, rule out all resets and host-specific ioctls.  */
 723         printk_ratelimited(KERN_WARNING
 724                            "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
 725
 726         return -ENOIOCTLCMD;
 727 }
 728 EXPORT_SYMBOL(scsi_verify_blk_ioctl);
 729
 730 int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
 731                        unsigned int cmd, void __user *arg)
 732 {
 733         int ret;
 734
 735         ret = scsi_verify_blk_ioctl(bd, cmd);
 736         if (ret < 0)
 737                 return ret;
 738
 739         return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
 740 }
 741 EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
 742
 743 static int __init blk_scsi_ioctl_init(void)
 744 {
 745         blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
 746         return 0;
 747 }
 748 fs_initcall(blk_scsi_ioctl_init);