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