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