block/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/capability.h>
   3 #include <linux/compat.h>
   4 #include <linux/blkdev.h>
   5 #include <linux/export.h>
   6 #include <linux/gfp.h>
   7 #include <linux/blkpg.h>
   8 #include <linux/hdreg.h>
   9 #include <linux/backing-dev.h>
  10 #include <linux/fs.h>
  11 #include <linux/blktrace_api.h>
  12 #include <linux/pr.h>
  13 #include <linux/uaccess.h>
  14
  15 static int blkpg_do_ioctl(struct block_device *bdev,
  16                           struct blkpg_partition __user *upart, int op)
  17 {
  18         struct block_device *bdevp;
  19         struct gendisk *disk;
  20         struct hd_struct *part, *lpart;
  21         struct blkpg_partition p;
  22         struct disk_part_iter piter;
  23         long long start, length;
  24         int partno;
  25
  26         if (!capable(CAP_SYS_ADMIN))
  27                 return -EACCES;
  28         if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
  29                 return -EFAULT;
  30         disk = bdev->bd_disk;
  31         if (bdev != bdev->bd_contains)
  32                 return -EINVAL;
  33         partno = p.pno;
  34         if (partno <= 0)
  35                 return -EINVAL;
  36         switch (op) {
  37                 case BLKPG_ADD_PARTITION:
  38                         start = p.start >> 9;
  39                         length = p.length >> 9;
  40                         /* check for fit in a hd_struct */
  41                         if (sizeof(sector_t) == sizeof(long) &&
  42                             sizeof(long long) > sizeof(long)) {
  43                                 long pstart = start, plength = length;
  44                                 if (pstart != start || plength != length
  45                                     || pstart < 0 || plength < 0 || partno > 65535)
  46                                         return -EINVAL;
  47                         }
  48                         /* check if partition is aligned to blocksize */
  49                         if (p.start & (bdev_logical_block_size(bdev) - 1))
  50                                 return -EINVAL;
  51
  52                         mutex_lock(&bdev->bd_mutex);
  53
  54                         /* overlap? */
  55                         disk_part_iter_init(&piter, disk,
  56                                             DISK_PITER_INCL_EMPTY);
  57                         while ((part = disk_part_iter_next(&piter))) {
  58                                 if (!(start + length <= part->start_sect ||
  59                                       start >= part->start_sect + part->nr_sects)) {
  60                                         disk_part_iter_exit(&piter);
  61                                         mutex_unlock(&bdev->bd_mutex);
  62                                         return -EBUSY;
  63                                 }
  64                         }
  65                         disk_part_iter_exit(&piter);
  66
  67                         /* all seems OK */
  68                         part = add_partition(disk, partno, start, length,
  69                                              ADDPART_FLAG_NONE, NULL);
  70                         mutex_unlock(&bdev->bd_mutex);
  71                         return PTR_ERR_OR_ZERO(part);
  72                 case BLKPG_DEL_PARTITION:
  73                         part = disk_get_part(disk, partno);
  74                         if (!part)
  75                                 return -ENXIO;
  76
  77                         bdevp = bdget(part_devt(part));
  78                         disk_put_part(part);
  79                         if (!bdevp)
  80                                 return -ENOMEM;
  81
  82                         mutex_lock(&bdevp->bd_mutex);
  83                         if (bdevp->bd_openers) {
  84                                 mutex_unlock(&bdevp->bd_mutex);
  85                                 bdput(bdevp);
  86                                 return -EBUSY;
  87                         }
  88                         /* all seems OK */
  89                         fsync_bdev(bdevp);
  90                         invalidate_bdev(bdevp);
  91
  92                         mutex_lock_nested(&bdev->bd_mutex, 1);
  93                         delete_partition(disk, partno);
  94                         mutex_unlock(&bdev->bd_mutex);
  95                         mutex_unlock(&bdevp->bd_mutex);
  96                         bdput(bdevp);
  97
  98                         return 0;
  99                 case BLKPG_RESIZE_PARTITION:
 100                         start = p.start >> 9;
 101                         /* new length of partition in bytes */
 102                         length = p.length >> 9;
 103                         /* check for fit in a hd_struct */
 104                         if (sizeof(sector_t) == sizeof(long) &&
 105                             sizeof(long long) > sizeof(long)) {
 106                                 long pstart = start, plength = length;
 107                                 if (pstart != start || plength != length
 108                                     || pstart < 0 || plength < 0)
 109                                         return -EINVAL;
 110                         }
 111                         part = disk_get_part(disk, partno);
 112                         if (!part)
 113                                 return -ENXIO;
 114                         bdevp = bdget(part_devt(part));
 115                         if (!bdevp) {
 116                                 disk_put_part(part);
 117                                 return -ENOMEM;
 118                         }
 119                         mutex_lock(&bdevp->bd_mutex);
 120                         mutex_lock_nested(&bdev->bd_mutex, 1);
 121                         if (start != part->start_sect) {
 122                                 mutex_unlock(&bdevp->bd_mutex);
 123                                 mutex_unlock(&bdev->bd_mutex);
 124                                 bdput(bdevp);
 125                                 disk_put_part(part);
 126                                 return -EINVAL;
 127                         }
 128                         /* overlap? */
 129                         disk_part_iter_init(&piter, disk,
 130                                             DISK_PITER_INCL_EMPTY);
 131                         while ((lpart = disk_part_iter_next(&piter))) {
 132                                 if (lpart->partno != partno &&
 133                                    !(start + length <= lpart->start_sect ||
 134                                    start >= lpart->start_sect + lpart->nr_sects)
 135                                    ) {
 136                                         disk_part_iter_exit(&piter);
 137                                         mutex_unlock(&bdevp->bd_mutex);
 138                                         mutex_unlock(&bdev->bd_mutex);
 139                                         bdput(bdevp);
 140                                         disk_put_part(part);
 141                                         return -EBUSY;
 142                                 }
 143                         }
 144                         disk_part_iter_exit(&piter);
 145                         part_nr_sects_write(part, (sector_t)length);
 146                         i_size_write(bdevp->bd_inode, p.length);
 147                         mutex_unlock(&bdevp->bd_mutex);
 148                         mutex_unlock(&bdev->bd_mutex);
 149                         bdput(bdevp);
 150                         disk_put_part(part);
 151                         return 0;
 152                 default:
 153                         return -EINVAL;
 154         }
 155 }
 156
 157 static int blkpg_ioctl(struct block_device *bdev,
 158                        struct blkpg_ioctl_arg __user *arg)
 159 {
 160         struct blkpg_partition __user *udata;
 161         int op;
 162
 163         if (get_user(op, &arg->op) || get_user(udata, &arg->data))
 164                 return -EFAULT;
 165
 166         return blkpg_do_ioctl(bdev, udata, op);
 167 }
 168
 169 #ifdef CONFIG_COMPAT
 170 struct compat_blkpg_ioctl_arg {
 171         compat_int_t op;
 172         compat_int_t flags;
 173         compat_int_t datalen;
 174         compat_caddr_t data;
 175 };
 176
 177 static int compat_blkpg_ioctl(struct block_device *bdev,
 178                               struct compat_blkpg_ioctl_arg __user *arg)
 179 {
 180         compat_caddr_t udata;
 181         int op;
 182
 183         if (get_user(op, &arg->op) || get_user(udata, &arg->data))
 184                 return -EFAULT;
 185
 186         return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
 187 }
 188 #endif
 189
 190 static int blkdev_reread_part(struct block_device *bdev)
 191 {
 192         int ret;
 193
 194         if (!disk_part_scan_enabled(bdev->bd_disk) || bdev != bdev->bd_contains)
 195                 return -EINVAL;
 196         if (!capable(CAP_SYS_ADMIN))
 197                 return -EACCES;
 198
 199         mutex_lock(&bdev->bd_mutex);
 200         ret = bdev_disk_changed(bdev, false);
 201         mutex_unlock(&bdev->bd_mutex);
 202
 203         return ret;
 204 }
 205
 206 static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode,
 207                 unsigned long arg, unsigned long flags)
 208 {
 209         uint64_t range[2];
 210         uint64_t start, len;
 211         struct request_queue *q = bdev_get_queue(bdev);
 212         struct address_space *mapping = bdev->bd_inode->i_mapping;
 213
 214
 215         if (!(mode & FMODE_WRITE))
 216                 return -EBADF;
 217
 218         if (!blk_queue_discard(q))
 219                 return -EOPNOTSUPP;
 220
 221         if (copy_from_user(range, (void __user *)arg, sizeof(range)))
 222                 return -EFAULT;
 223
 224         start = range[0];
 225         len = range[1];
 226
 227         if (start & 511)
 228                 return -EINVAL;
 229         if (len & 511)
 230                 return -EINVAL;
 231
 232         if (start + len > i_size_read(bdev->bd_inode))
 233                 return -EINVAL;
 234         truncate_inode_pages_range(mapping, start, start + len - 1);
 235         return blkdev_issue_discard(bdev, start >> 9, len >> 9,
 236                                     GFP_KERNEL, flags);
 237 }
 238
 239 static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode,
 240                 unsigned long arg)
 241 {
 242         uint64_t range[2];
 243         struct address_space *mapping;
 244         uint64_t start, end, len;
 245
 246         if (!(mode & FMODE_WRITE))
 247                 return -EBADF;
 248
 249         if (copy_from_user(range, (void __user *)arg, sizeof(range)))
 250                 return -EFAULT;
 251
 252         start = range[0];
 253         len = range[1];
 254         end = start + len - 1;
 255
 256         if (start & 511)
 257                 return -EINVAL;
 258         if (len & 511)
 259                 return -EINVAL;
 260         if (end >= (uint64_t)i_size_read(bdev->bd_inode))
 261                 return -EINVAL;
 262         if (end < start)
 263                 return -EINVAL;
 264
 265         /* Invalidate the page cache, including dirty pages */
 266         mapping = bdev->bd_inode->i_mapping;
 267         truncate_inode_pages_range(mapping, start, end);
 268
 269         return blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
 270                         BLKDEV_ZERO_NOUNMAP);
 271 }
 272
 273 static int put_ushort(unsigned short __user *argp, unsigned short val)
 274 {
 275         return put_user(val, argp);
 276 }
 277
 278 static int put_int(int __user *argp, int val)
 279 {
 280         return put_user(val, argp);
 281 }
 282
 283 static int put_uint(unsigned int __user *argp, unsigned int val)
 284 {
 285         return put_user(val, argp);
 286 }
 287
 288 static int put_long(long __user *argp, long val)
 289 {
 290         return put_user(val, argp);
 291 }
 292
 293 static int put_ulong(unsigned long __user *argp, unsigned long val)
 294 {
 295         return put_user(val, argp);
 296 }
 297
 298 static int put_u64(u64 __user *argp, u64 val)
 299 {
 300         return put_user(val, argp);
 301 }
 302
 303 #ifdef CONFIG_COMPAT
 304 static int compat_put_long(compat_long_t *argp, long val)
 305 {
 306         return put_user(val, argp);
 307 }
 308
 309 static int compat_put_ulong(compat_ulong_t *argp, compat_ulong_t val)
 310 {
 311         return put_user(val, argp);
 312 }
 313 #endif
 314
 315 int __blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
 316                         unsigned cmd, unsigned long arg)
 317 {
 318         struct gendisk *disk = bdev->bd_disk;
 319
 320         if (disk->fops->ioctl)
 321                 return disk->fops->ioctl(bdev, mode, cmd, arg);
 322
 323         return -ENOTTY;
 324 }
 325 /*
 326  * For the record: _GPL here is only because somebody decided to slap it
 327  * on the previous export.  Sheer idiocy, since it wasn't copyrightable
 328  * at all and could be open-coded without any exports by anybody who cares.
 329  */
 330 EXPORT_SYMBOL_GPL(__blkdev_driver_ioctl);
 331
 332 #ifdef CONFIG_COMPAT
 333 /*
 334  * This is the equivalent of compat_ptr_ioctl(), to be used by block
 335  * drivers that implement only commands that are completely compatible
 336  * between 32-bit and 64-bit user space
 337  */
 338 int blkdev_compat_ptr_ioctl(struct block_device *bdev, fmode_t mode,
 339                         unsigned cmd, unsigned long arg)
 340 {
 341         struct gendisk *disk = bdev->bd_disk;
 342
 343         if (disk->fops->ioctl)
 344                 return disk->fops->ioctl(bdev, mode, cmd,
 345                                          (unsigned long)compat_ptr(arg));
 346
 347         return -ENOIOCTLCMD;
 348 }
 349 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
 350 #endif
 351
 352 static int blkdev_pr_register(struct block_device *bdev,
 353                 struct pr_registration __user *arg)
 354 {
 355         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 356         struct pr_registration reg;
 357
 358         if (!capable(CAP_SYS_ADMIN))
 359                 return -EPERM;
 360         if (!ops || !ops->pr_register)
 361                 return -EOPNOTSUPP;
 362         if (copy_from_user(&reg, arg, sizeof(reg)))
 363                 return -EFAULT;
 364
 365         if (reg.flags & ~PR_FL_IGNORE_KEY)
 366                 return -EOPNOTSUPP;
 367         return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
 368 }
 369
 370 static int blkdev_pr_reserve(struct block_device *bdev,
 371                 struct pr_reservation __user *arg)
 372 {
 373         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 374         struct pr_reservation rsv;
 375
 376         if (!capable(CAP_SYS_ADMIN))
 377                 return -EPERM;
 378         if (!ops || !ops->pr_reserve)
 379                 return -EOPNOTSUPP;
 380         if (copy_from_user(&rsv, arg, sizeof(rsv)))
 381                 return -EFAULT;
 382
 383         if (rsv.flags & ~PR_FL_IGNORE_KEY)
 384                 return -EOPNOTSUPP;
 385         return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
 386 }
 387
 388 static int blkdev_pr_release(struct block_device *bdev,
 389                 struct pr_reservation __user *arg)
 390 {
 391         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 392         struct pr_reservation rsv;
 393
 394         if (!capable(CAP_SYS_ADMIN))
 395                 return -EPERM;
 396         if (!ops || !ops->pr_release)
 397                 return -EOPNOTSUPP;
 398         if (copy_from_user(&rsv, arg, sizeof(rsv)))
 399                 return -EFAULT;
 400
 401         if (rsv.flags)
 402                 return -EOPNOTSUPP;
 403         return ops->pr_release(bdev, rsv.key, rsv.type);
 404 }
 405
 406 static int blkdev_pr_preempt(struct block_device *bdev,
 407                 struct pr_preempt __user *arg, bool abort)
 408 {
 409         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 410         struct pr_preempt p;
 411
 412         if (!capable(CAP_SYS_ADMIN))
 413                 return -EPERM;
 414         if (!ops || !ops->pr_preempt)
 415                 return -EOPNOTSUPP;
 416         if (copy_from_user(&p, arg, sizeof(p)))
 417                 return -EFAULT;
 418
 419         if (p.flags)
 420                 return -EOPNOTSUPP;
 421         return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
 422 }
 423
 424 static int blkdev_pr_clear(struct block_device *bdev,
 425                 struct pr_clear __user *arg)
 426 {
 427         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 428         struct pr_clear c;
 429
 430         if (!capable(CAP_SYS_ADMIN))
 431                 return -EPERM;
 432         if (!ops || !ops->pr_clear)
 433                 return -EOPNOTSUPP;
 434         if (copy_from_user(&c, arg, sizeof(c)))
 435                 return -EFAULT;
 436
 437         if (c.flags)
 438                 return -EOPNOTSUPP;
 439         return ops->pr_clear(bdev, c.key);
 440 }
 441
 442 /*
 443  * Is it an unrecognized ioctl? The correct returns are either
 444  * ENOTTY (final) or ENOIOCTLCMD ("I don't know this one, try a
 445  * fallback"). ENOIOCTLCMD gets turned into ENOTTY by the ioctl
 446  * code before returning.
 447  *
 448  * Confused drivers sometimes return EINVAL, which is wrong. It
 449  * means "I understood the ioctl command, but the parameters to
 450  * it were wrong".
 451  *
 452  * We should aim to just fix the broken drivers, the EINVAL case
 453  * should go away.
 454  */
 455 static inline int is_unrecognized_ioctl(int ret)
 456 {
 457         return  ret == -EINVAL ||
 458                 ret == -ENOTTY ||
 459                 ret == -ENOIOCTLCMD;
 460 }
 461
 462 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
 463                 unsigned cmd, unsigned long arg)
 464 {
 465         int ret;
 466
 467         if (!capable(CAP_SYS_ADMIN))
 468                 return -EACCES;
 469
 470         ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 471         if (!is_unrecognized_ioctl(ret))
 472                 return ret;
 473
 474         fsync_bdev(bdev);
 475         invalidate_bdev(bdev);
 476         return 0;
 477 }
 478
 479 static int blkdev_roset(struct block_device *bdev, fmode_t mode,
 480                 unsigned cmd, unsigned long arg)
 481 {
 482         int ret, n;
 483
 484         if (!capable(CAP_SYS_ADMIN))
 485                 return -EACCES;
 486
 487         ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 488         if (!is_unrecognized_ioctl(ret))
 489                 return ret;
 490         if (get_user(n, (int __user *)arg))
 491                 return -EFAULT;
 492         set_device_ro(bdev, n);
 493         return 0;
 494 }
 495
 496 static int blkdev_getgeo(struct block_device *bdev,
 497                 struct hd_geometry __user *argp)
 498 {
 499         struct gendisk *disk = bdev->bd_disk;
 500         struct hd_geometry geo;
 501         int ret;
 502
 503         if (!argp)
 504                 return -EINVAL;
 505         if (!disk->fops->getgeo)
 506                 return -ENOTTY;
 507
 508         /*
 509          * We need to set the startsect first, the driver may
 510          * want to override it.
 511          */
 512         memset(&geo, 0, sizeof(geo));
 513         geo.start = get_start_sect(bdev);
 514         ret = disk->fops->getgeo(bdev, &geo);
 515         if (ret)
 516                 return ret;
 517         if (copy_to_user(argp, &geo, sizeof(geo)))
 518                 return -EFAULT;
 519         return 0;
 520 }
 521
 522 #ifdef CONFIG_COMPAT
 523 struct compat_hd_geometry {
 524         unsigned char heads;
 525         unsigned char sectors;
 526         unsigned short cylinders;
 527         u32 start;
 528 };
 529
 530 static int compat_hdio_getgeo(struct block_device *bdev,
 531                               struct compat_hd_geometry __user *ugeo)
 532 {
 533         struct gendisk *disk = bdev->bd_disk;
 534         struct hd_geometry geo;
 535         int ret;
 536
 537         if (!ugeo)
 538                 return -EINVAL;
 539         if (!disk->fops->getgeo)
 540                 return -ENOTTY;
 541
 542         memset(&geo, 0, sizeof(geo));
 543         /*
 544          * We need to set the startsect first, the driver may
 545          * want to override it.
 546          */
 547         geo.start = get_start_sect(bdev);
 548         ret = disk->fops->getgeo(bdev, &geo);
 549         if (ret)
 550                 return ret;
 551
 552         ret = copy_to_user(ugeo, &geo, 4);
 553         ret |= put_user(geo.start, &ugeo->start);
 554         if (ret)
 555                 ret = -EFAULT;
 556
 557         return ret;
 558 }
 559 #endif
 560
 561 /* set the logical block size */
 562 static int blkdev_bszset(struct block_device *bdev, fmode_t mode,
 563                 int __user *argp)
 564 {
 565         int ret, n;
 566
 567         if (!capable(CAP_SYS_ADMIN))
 568                 return -EACCES;
 569         if (!argp)
 570                 return -EINVAL;
 571         if (get_user(n, argp))
 572                 return -EFAULT;
 573
 574         if (!(mode & FMODE_EXCL)) {
 575                 bdgrab(bdev);
 576                 if (blkdev_get(bdev, mode | FMODE_EXCL, &bdev) < 0)
 577                         return -EBUSY;
 578         }
 579
 580         ret = set_blocksize(bdev, n);
 581         if (!(mode & FMODE_EXCL))
 582                 blkdev_put(bdev, mode | FMODE_EXCL);
 583         return ret;
 584 }
 585
 586 /*
 587  * Common commands that are handled the same way on native and compat
 588  * user space. Note the separate arg/argp parameters that are needed
 589  * to deal with the compat_ptr() conversion.
 590  */
 591 static int blkdev_common_ioctl(struct block_device *bdev, fmode_t mode,
 592                                 unsigned cmd, unsigned long arg, void __user *argp)
 593 {
 594         unsigned int max_sectors;
 595
 596         switch (cmd) {
 597         case BLKFLSBUF:
 598                 return blkdev_flushbuf(bdev, mode, cmd, arg);
 599         case BLKROSET:
 600                 return blkdev_roset(bdev, mode, cmd, arg);
 601         case BLKDISCARD:
 602                 return blk_ioctl_discard(bdev, mode, arg, 0);
 603         case BLKSECDISCARD:
 604                 return blk_ioctl_discard(bdev, mode, arg,
 605                                 BLKDEV_DISCARD_SECURE);
 606         case BLKZEROOUT:
 607                 return blk_ioctl_zeroout(bdev, mode, arg);
 608         case BLKREPORTZONE:
 609                 return blkdev_report_zones_ioctl(bdev, mode, cmd, arg);
 610         case BLKRESETZONE:
 611         case BLKOPENZONE:
 612         case BLKCLOSEZONE:
 613         case BLKFINISHZONE:
 614                 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
 615         case BLKGETZONESZ:
 616                 return put_uint(argp, bdev_zone_sectors(bdev));
 617         case BLKGETNRZONES:
 618                 return put_uint(argp, blkdev_nr_zones(bdev->bd_disk));
 619         case BLKROGET:
 620                 return put_int(argp, bdev_read_only(bdev) != 0);
 621         case BLKSSZGET: /* get block device logical block size */
 622                 return put_int(argp, bdev_logical_block_size(bdev));
 623         case BLKPBSZGET: /* get block device physical block size */
 624                 return put_uint(argp, bdev_physical_block_size(bdev));
 625         case BLKIOMIN:
 626                 return put_uint(argp, bdev_io_min(bdev));
 627         case BLKIOOPT:
 628                 return put_uint(argp, bdev_io_opt(bdev));
 629         case BLKALIGNOFF:
 630                 return put_int(argp, bdev_alignment_offset(bdev));
 631         case BLKDISCARDZEROES:
 632                 return put_uint(argp, 0);
 633         case BLKSECTGET:
 634                 max_sectors = min_t(unsigned int, USHRT_MAX,
 635                                     queue_max_sectors(bdev_get_queue(bdev)));
 636                 return put_ushort(argp, max_sectors);
 637         case BLKROTATIONAL:
 638                 return put_ushort(argp, !blk_queue_nonrot(bdev_get_queue(bdev)));
 639         case BLKRASET:
 640         case BLKFRASET:
 641                 if(!capable(CAP_SYS_ADMIN))
 642                         return -EACCES;
 643                 bdev->bd_bdi->ra_pages = (arg * 512) / PAGE_SIZE;
 644                 return 0;
 645         case BLKRRPART:
 646                 return blkdev_reread_part(bdev);
 647         case BLKTRACESTART:
 648         case BLKTRACESTOP:
 649         case BLKTRACETEARDOWN:
 650                 return blk_trace_ioctl(bdev, cmd, argp);
 651         case IOC_PR_REGISTER:
 652                 return blkdev_pr_register(bdev, argp);
 653         case IOC_PR_RESERVE:
 654                 return blkdev_pr_reserve(bdev, argp);
 655         case IOC_PR_RELEASE:
 656                 return blkdev_pr_release(bdev, argp);
 657         case IOC_PR_PREEMPT:
 658                 return blkdev_pr_preempt(bdev, argp, false);
 659         case IOC_PR_PREEMPT_ABORT:
 660                 return blkdev_pr_preempt(bdev, argp, true);
 661         case IOC_PR_CLEAR:
 662                 return blkdev_pr_clear(bdev, argp);
 663         default:
 664                 return -ENOIOCTLCMD;
 665         }
 666 }
 667
 668 /*
 669  * Always keep this in sync with compat_blkdev_ioctl()
 670  * to handle all incompatible commands in both functions.
 671  *
 672  * New commands must be compatible and go into blkdev_common_ioctl
 673  */
 674 int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 675                         unsigned long arg)
 676 {
 677         int ret;
 678         loff_t size;
 679         void __user *argp = (void __user *)arg;
 680
 681         switch (cmd) {
 682         /* These need separate implementations for the data structure */
 683         case HDIO_GETGEO:
 684                 return blkdev_getgeo(bdev, argp);
 685         case BLKPG:
 686                 return blkpg_ioctl(bdev, argp);
 687
 688         /* Compat mode returns 32-bit data instead of 'long' */
 689         case BLKRAGET:
 690         case BLKFRAGET:
 691                 if (!argp)
 692                         return -EINVAL;
 693                 return put_long(argp, (bdev->bd_bdi->ra_pages*PAGE_SIZE) / 512);
 694         case BLKGETSIZE:
 695                 size = i_size_read(bdev->bd_inode);
 696                 if ((size >> 9) > ~0UL)
 697                         return -EFBIG;
 698                 return put_ulong(argp, size >> 9);
 699
 700         /* The data is compatible, but the command number is different */
 701         case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
 702                 return put_int(argp, block_size(bdev));
 703         case BLKBSZSET:
 704                 return blkdev_bszset(bdev, mode, argp);
 705         case BLKGETSIZE64:
 706                 return put_u64(argp, i_size_read(bdev->bd_inode));
 707
 708         /* Incompatible alignment on i386 */
 709         case BLKTRACESETUP:
 710                 return blk_trace_ioctl(bdev, cmd, argp);
 711         default:
 712                 break;
 713         }
 714
 715         ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
 716         if (ret == -ENOIOCTLCMD)
 717                 return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 718
 719         return ret;
 720 }
 721 EXPORT_SYMBOL_GPL(blkdev_ioctl); /* for /dev/raw */
 722
 723 #ifdef CONFIG_COMPAT
 724
 725 #define BLKBSZGET_32            _IOR(0x12, 112, int)
 726 #define BLKBSZSET_32            _IOW(0x12, 113, int)
 727 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
 728
 729 /* Most of the generic ioctls are handled in the normal fallback path.
 730    This assumes the blkdev's low level compat_ioctl always returns
 731    ENOIOCTLCMD for unknown ioctls. */
 732 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 733 {
 734         int ret;
 735         void __user *argp = compat_ptr(arg);
 736         struct inode *inode = file->f_mapping->host;
 737         struct block_device *bdev = inode->i_bdev;
 738         struct gendisk *disk = bdev->bd_disk;
 739         fmode_t mode = file->f_mode;
 740         loff_t size;
 741
 742         /*
 743          * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have
 744          * to updated it before every ioctl.
 745          */
 746         if (file->f_flags & O_NDELAY)
 747                 mode |= FMODE_NDELAY;
 748         else
 749                 mode &= ~FMODE_NDELAY;
 750
 751         switch (cmd) {
 752         /* These need separate implementations for the data structure */
 753         case HDIO_GETGEO:
 754                 return compat_hdio_getgeo(bdev, argp);
 755         case BLKPG:
 756                 return compat_blkpg_ioctl(bdev, argp);
 757
 758         /* Compat mode returns 32-bit data instead of 'long' */
 759         case BLKRAGET:
 760         case BLKFRAGET:
 761                 if (!argp)
 762                         return -EINVAL;
 763                 return compat_put_long(argp,
 764                                (bdev->bd_bdi->ra_pages * PAGE_SIZE) / 512);
 765         case BLKGETSIZE:
 766                 size = i_size_read(bdev->bd_inode);
 767                 if ((size >> 9) > ~0UL)
 768                         return -EFBIG;
 769                 return compat_put_ulong(argp, size >> 9);
 770
 771         /* The data is compatible, but the command number is different */
 772         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 773                 return put_int(argp, bdev_logical_block_size(bdev));
 774         case BLKBSZSET_32:
 775                 return blkdev_bszset(bdev, mode, argp);
 776         case BLKGETSIZE64_32:
 777                 return put_u64(argp, i_size_read(bdev->bd_inode));
 778
 779         /* Incompatible alignment on i386 */
 780         case BLKTRACESETUP32:
 781                 return blk_trace_ioctl(bdev, cmd, argp);
 782         default:
 783                 break;
 784         }
 785
 786         ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
 787         if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
 788                 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 789
 790         return ret;
 791 }
 792 #endif