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 gendisk *disk = bdev->bd_disk;
  20         struct blkpg_partition p;
  21         sector_t start, length, capacity, end;
  22
  23         if (!capable(CAP_SYS_ADMIN))
  24                 return -EACCES;
  25         if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))
  26                 return -EFAULT;
  27         if (bdev_is_partition(bdev))
  28                 return -EINVAL;
  29
  30         if (p.pno <= 0)
  31                 return -EINVAL;
  32
  33         if (op == BLKPG_DEL_PARTITION)
  34                 return bdev_del_partition(disk, p.pno);
  35
  36         if (p.start < 0 || p.length <= 0 || LLONG_MAX - p.length < p.start)
  37                 return -EINVAL;
  38         /* Check that the partition is aligned to the block size */
  39         if (!IS_ALIGNED(p.start | p.length, bdev_logical_block_size(bdev)))
  40                 return -EINVAL;
  41
  42         start = p.start >> SECTOR_SHIFT;
  43         length = p.length >> SECTOR_SHIFT;
  44         capacity = get_capacity(disk);
  45
  46         if (check_add_overflow(start, length, &end))
  47                 return -EINVAL;
  48
  49         if (start >= capacity || end > capacity)
  50                 return -EINVAL;
  51
  52         switch (op) {
  53         case BLKPG_ADD_PARTITION:
  54                 return bdev_add_partition(disk, p.pno, start, length);
  55         case BLKPG_RESIZE_PARTITION:
  56                 return bdev_resize_partition(disk, p.pno, start, length);
  57         default:
  58                 return -EINVAL;
  59         }
  60 }
  61
  62 static int blkpg_ioctl(struct block_device *bdev,
  63                        struct blkpg_ioctl_arg __user *arg)
  64 {
  65         struct blkpg_partition __user *udata;
  66         int op;
  67
  68         if (get_user(op, &arg->op) || get_user(udata, &arg->data))
  69                 return -EFAULT;
  70
  71         return blkpg_do_ioctl(bdev, udata, op);
  72 }
  73
  74 #ifdef CONFIG_COMPAT
  75 struct compat_blkpg_ioctl_arg {
  76         compat_int_t op;
  77         compat_int_t flags;
  78         compat_int_t datalen;
  79         compat_caddr_t data;
  80 };
  81
  82 static int compat_blkpg_ioctl(struct block_device *bdev,
  83                               struct compat_blkpg_ioctl_arg __user *arg)
  84 {
  85         compat_caddr_t udata;
  86         int op;
  87
  88         if (get_user(op, &arg->op) || get_user(udata, &arg->data))
  89                 return -EFAULT;
  90
  91         return blkpg_do_ioctl(bdev, compat_ptr(udata), op);
  92 }
  93 #endif
  94
  95 static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode,
  96                 unsigned long arg)
  97 {
  98         unsigned int bs_mask = bdev_logical_block_size(bdev) - 1;
  99         uint64_t range[2], start, len, end;
 100         struct bio *prev = NULL, *bio;
 101         sector_t sector, nr_sects;
 102         struct blk_plug plug;
 103         int err;
 104
 105         if (!(mode & BLK_OPEN_WRITE))
 106                 return -EBADF;
 107
 108         if (!bdev_max_discard_sectors(bdev))
 109                 return -EOPNOTSUPP;
 110         if (bdev_read_only(bdev))
 111                 return -EPERM;
 112
 113         if (copy_from_user(range, (void __user *)arg, sizeof(range)))
 114                 return -EFAULT;
 115
 116         start = range[0];
 117         len = range[1];
 118
 119         if (!len)
 120                 return -EINVAL;
 121         if ((start | len) & bs_mask)
 122                 return -EINVAL;
 123
 124         if (check_add_overflow(start, len, &end) ||
 125             end > bdev_nr_bytes(bdev))
 126                 return -EINVAL;
 127
 128         filemap_invalidate_lock(bdev->bd_mapping);
 129         err = truncate_bdev_range(bdev, mode, start, start + len - 1);
 130         if (err)
 131                 goto fail;
 132
 133         sector = start >> SECTOR_SHIFT;
 134         nr_sects = len >> SECTOR_SHIFT;
 135
 136         blk_start_plug(&plug);
 137         while (1) {
 138                 if (fatal_signal_pending(current)) {
 139                         if (prev)
 140                                 bio_await_chain(prev);
 141                         err = -EINTR;
 142                         goto out_unplug;
 143                 }
 144                 bio = blk_alloc_discard_bio(bdev, &sector, &nr_sects,
 145                                 GFP_KERNEL);
 146                 if (!bio)
 147                         break;
 148                 prev = bio_chain_and_submit(prev, bio);
 149         }
 150         if (prev) {
 151                 err = submit_bio_wait(prev);
 152                 if (err == -EOPNOTSUPP)
 153                         err = 0;
 154                 bio_put(prev);
 155         }
 156 out_unplug:
 157         blk_finish_plug(&plug);
 158 fail:
 159         filemap_invalidate_unlock(bdev->bd_mapping);
 160         return err;
 161 }
 162
 163 static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode,
 164                 void __user *argp)
 165 {
 166         uint64_t start, len;
 167         uint64_t range[2];
 168         int err;
 169
 170         if (!(mode & BLK_OPEN_WRITE))
 171                 return -EBADF;
 172         if (!bdev_max_secure_erase_sectors(bdev))
 173                 return -EOPNOTSUPP;
 174         if (copy_from_user(range, argp, sizeof(range)))
 175                 return -EFAULT;
 176
 177         start = range[0];
 178         len = range[1];
 179         if ((start & 511) || (len & 511))
 180                 return -EINVAL;
 181         if (start + len > bdev_nr_bytes(bdev))
 182                 return -EINVAL;
 183
 184         filemap_invalidate_lock(bdev->bd_mapping);
 185         err = truncate_bdev_range(bdev, mode, start, start + len - 1);
 186         if (!err)
 187                 err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9,
 188                                                 GFP_KERNEL);
 189         filemap_invalidate_unlock(bdev->bd_mapping);
 190         return err;
 191 }
 192
 193
 194 static int blk_ioctl_zeroout(struct block_device *bdev, blk_mode_t mode,
 195                 unsigned long arg)
 196 {
 197         uint64_t range[2];
 198         uint64_t start, end, len;
 199         int err;
 200
 201         if (!(mode & BLK_OPEN_WRITE))
 202                 return -EBADF;
 203
 204         if (copy_from_user(range, (void __user *)arg, sizeof(range)))
 205                 return -EFAULT;
 206
 207         start = range[0];
 208         len = range[1];
 209         end = start + len - 1;
 210
 211         if (start & 511)
 212                 return -EINVAL;
 213         if (len & 511)
 214                 return -EINVAL;
 215         if (end >= (uint64_t)bdev_nr_bytes(bdev))
 216                 return -EINVAL;
 217         if (end < start)
 218                 return -EINVAL;
 219
 220         /* Invalidate the page cache, including dirty pages */
 221         filemap_invalidate_lock(bdev->bd_mapping);
 222         err = truncate_bdev_range(bdev, mode, start, end);
 223         if (err)
 224                 goto fail;
 225
 226         err = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL,
 227                                    BLKDEV_ZERO_NOUNMAP | BLKDEV_ZERO_KILLABLE);
 228
 229 fail:
 230         filemap_invalidate_unlock(bdev->bd_mapping);
 231         return err;
 232 }
 233
 234 static int put_ushort(unsigned short __user *argp, unsigned short val)
 235 {
 236         return put_user(val, argp);
 237 }
 238
 239 static int put_int(int __user *argp, int val)
 240 {
 241         return put_user(val, argp);
 242 }
 243
 244 static int put_uint(unsigned int __user *argp, unsigned int val)
 245 {
 246         return put_user(val, argp);
 247 }
 248
 249 static int put_long(long __user *argp, long val)
 250 {
 251         return put_user(val, argp);
 252 }
 253
 254 static int put_ulong(unsigned long __user *argp, unsigned long val)
 255 {
 256         return put_user(val, argp);
 257 }
 258
 259 static int put_u64(u64 __user *argp, u64 val)
 260 {
 261         return put_user(val, argp);
 262 }
 263
 264 #ifdef CONFIG_COMPAT
 265 static int compat_put_long(compat_long_t __user *argp, long val)
 266 {
 267         return put_user(val, argp);
 268 }
 269
 270 static int compat_put_ulong(compat_ulong_t __user *argp, compat_ulong_t val)
 271 {
 272         return put_user(val, argp);
 273 }
 274 #endif
 275
 276 #ifdef CONFIG_COMPAT
 277 /*
 278  * This is the equivalent of compat_ptr_ioctl(), to be used by block
 279  * drivers that implement only commands that are completely compatible
 280  * between 32-bit and 64-bit user space
 281  */
 282 int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
 283                         unsigned cmd, unsigned long arg)
 284 {
 285         struct gendisk *disk = bdev->bd_disk;
 286
 287         if (disk->fops->ioctl)
 288                 return disk->fops->ioctl(bdev, mode, cmd,
 289                                          (unsigned long)compat_ptr(arg));
 290
 291         return -ENOIOCTLCMD;
 292 }
 293 EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
 294 #endif
 295
 296 static bool blkdev_pr_allowed(struct block_device *bdev, blk_mode_t mode)
 297 {
 298         /* no sense to make reservations for partitions */
 299         if (bdev_is_partition(bdev))
 300                 return false;
 301
 302         if (capable(CAP_SYS_ADMIN))
 303                 return true;
 304         /*
 305          * Only allow unprivileged reservations if the file descriptor is open
 306          * for writing.
 307          */
 308         return mode & BLK_OPEN_WRITE;
 309 }
 310
 311 static int blkdev_pr_register(struct block_device *bdev, blk_mode_t mode,
 312                 struct pr_registration __user *arg)
 313 {
 314         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 315         struct pr_registration reg;
 316
 317         if (!blkdev_pr_allowed(bdev, mode))
 318                 return -EPERM;
 319         if (!ops || !ops->pr_register)
 320                 return -EOPNOTSUPP;
 321         if (copy_from_user(&reg, arg, sizeof(reg)))
 322                 return -EFAULT;
 323
 324         if (reg.flags & ~PR_FL_IGNORE_KEY)
 325                 return -EOPNOTSUPP;
 326         return ops->pr_register(bdev, reg.old_key, reg.new_key, reg.flags);
 327 }
 328
 329 static int blkdev_pr_reserve(struct block_device *bdev, blk_mode_t mode,
 330                 struct pr_reservation __user *arg)
 331 {
 332         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 333         struct pr_reservation rsv;
 334
 335         if (!blkdev_pr_allowed(bdev, mode))
 336                 return -EPERM;
 337         if (!ops || !ops->pr_reserve)
 338                 return -EOPNOTSUPP;
 339         if (copy_from_user(&rsv, arg, sizeof(rsv)))
 340                 return -EFAULT;
 341
 342         if (rsv.flags & ~PR_FL_IGNORE_KEY)
 343                 return -EOPNOTSUPP;
 344         return ops->pr_reserve(bdev, rsv.key, rsv.type, rsv.flags);
 345 }
 346
 347 static int blkdev_pr_release(struct block_device *bdev, blk_mode_t mode,
 348                 struct pr_reservation __user *arg)
 349 {
 350         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 351         struct pr_reservation rsv;
 352
 353         if (!blkdev_pr_allowed(bdev, mode))
 354                 return -EPERM;
 355         if (!ops || !ops->pr_release)
 356                 return -EOPNOTSUPP;
 357         if (copy_from_user(&rsv, arg, sizeof(rsv)))
 358                 return -EFAULT;
 359
 360         if (rsv.flags)
 361                 return -EOPNOTSUPP;
 362         return ops->pr_release(bdev, rsv.key, rsv.type);
 363 }
 364
 365 static int blkdev_pr_preempt(struct block_device *bdev, blk_mode_t mode,
 366                 struct pr_preempt __user *arg, bool abort)
 367 {
 368         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 369         struct pr_preempt p;
 370
 371         if (!blkdev_pr_allowed(bdev, mode))
 372                 return -EPERM;
 373         if (!ops || !ops->pr_preempt)
 374                 return -EOPNOTSUPP;
 375         if (copy_from_user(&p, arg, sizeof(p)))
 376                 return -EFAULT;
 377
 378         if (p.flags)
 379                 return -EOPNOTSUPP;
 380         return ops->pr_preempt(bdev, p.old_key, p.new_key, p.type, abort);
 381 }
 382
 383 static int blkdev_pr_clear(struct block_device *bdev, blk_mode_t mode,
 384                 struct pr_clear __user *arg)
 385 {
 386         const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
 387         struct pr_clear c;
 388
 389         if (!blkdev_pr_allowed(bdev, mode))
 390                 return -EPERM;
 391         if (!ops || !ops->pr_clear)
 392                 return -EOPNOTSUPP;
 393         if (copy_from_user(&c, arg, sizeof(c)))
 394                 return -EFAULT;
 395
 396         if (c.flags)
 397                 return -EOPNOTSUPP;
 398         return ops->pr_clear(bdev, c.key);
 399 }
 400
 401 static int blkdev_flushbuf(struct block_device *bdev, unsigned cmd,
 402                 unsigned long arg)
 403 {
 404         if (!capable(CAP_SYS_ADMIN))
 405                 return -EACCES;
 406
 407         mutex_lock(&bdev->bd_holder_lock);
 408         if (bdev->bd_holder_ops && bdev->bd_holder_ops->sync)
 409                 bdev->bd_holder_ops->sync(bdev);
 410         else {
 411                 mutex_unlock(&bdev->bd_holder_lock);
 412                 sync_blockdev(bdev);
 413         }
 414
 415         invalidate_bdev(bdev);
 416         return 0;
 417 }
 418
 419 static int blkdev_roset(struct block_device *bdev, unsigned cmd,
 420                 unsigned long arg)
 421 {
 422         int ret, n;
 423
 424         if (!capable(CAP_SYS_ADMIN))
 425                 return -EACCES;
 426
 427         if (get_user(n, (int __user *)arg))
 428                 return -EFAULT;
 429         if (bdev->bd_disk->fops->set_read_only) {
 430                 ret = bdev->bd_disk->fops->set_read_only(bdev, n);
 431                 if (ret)
 432                         return ret;
 433         }
 434         if (n)
 435                 bdev_set_flag(bdev, BD_READ_ONLY);
 436         else
 437                 bdev_clear_flag(bdev, BD_READ_ONLY);
 438         return 0;
 439 }
 440
 441 static int blkdev_getgeo(struct block_device *bdev,
 442                 struct hd_geometry __user *argp)
 443 {
 444         struct gendisk *disk = bdev->bd_disk;
 445         struct hd_geometry geo;
 446         int ret;
 447
 448         if (!argp)
 449                 return -EINVAL;
 450         if (!disk->fops->getgeo)
 451                 return -ENOTTY;
 452
 453         /*
 454          * We need to set the startsect first, the driver may
 455          * want to override it.
 456          */
 457         memset(&geo, 0, sizeof(geo));
 458         geo.start = get_start_sect(bdev);
 459         ret = disk->fops->getgeo(bdev, &geo);
 460         if (ret)
 461                 return ret;
 462         if (copy_to_user(argp, &geo, sizeof(geo)))
 463                 return -EFAULT;
 464         return 0;
 465 }
 466
 467 #ifdef CONFIG_COMPAT
 468 struct compat_hd_geometry {
 469         unsigned char heads;
 470         unsigned char sectors;
 471         unsigned short cylinders;
 472         u32 start;
 473 };
 474
 475 static int compat_hdio_getgeo(struct block_device *bdev,
 476                               struct compat_hd_geometry __user *ugeo)
 477 {
 478         struct gendisk *disk = bdev->bd_disk;
 479         struct hd_geometry geo;
 480         int ret;
 481
 482         if (!ugeo)
 483                 return -EINVAL;
 484         if (!disk->fops->getgeo)
 485                 return -ENOTTY;
 486
 487         memset(&geo, 0, sizeof(geo));
 488         /*
 489          * We need to set the startsect first, the driver may
 490          * want to override it.
 491          */
 492         geo.start = get_start_sect(bdev);
 493         ret = disk->fops->getgeo(bdev, &geo);
 494         if (ret)
 495                 return ret;
 496
 497         ret = copy_to_user(ugeo, &geo, 4);
 498         ret |= put_user(geo.start, &ugeo->start);
 499         if (ret)
 500                 ret = -EFAULT;
 501
 502         return ret;
 503 }
 504 #endif
 505
 506 /* set the logical block size */
 507 static int blkdev_bszset(struct file *file, blk_mode_t mode,
 508                 int __user *argp)
 509 {
 510         // this one might be file_inode(file)->i_rdev - a rare valid
 511         // use of file_inode() for those.
 512         dev_t dev = I_BDEV(file->f_mapping->host)->bd_dev;
 513         struct file *excl_file;
 514         int ret, n;
 515
 516         if (!capable(CAP_SYS_ADMIN))
 517                 return -EACCES;
 518         if (!argp)
 519                 return -EINVAL;
 520         if (get_user(n, argp))
 521                 return -EFAULT;
 522
 523         if (mode & BLK_OPEN_EXCL)
 524                 return set_blocksize(file, n);
 525
 526         excl_file = bdev_file_open_by_dev(dev, mode, &dev, NULL);
 527         if (IS_ERR(excl_file))
 528                 return -EBUSY;
 529         ret = set_blocksize(excl_file, n);
 530         fput(excl_file);
 531         return ret;
 532 }
 533
 534 /*
 535  * Common commands that are handled the same way on native and compat
 536  * user space. Note the separate arg/argp parameters that are needed
 537  * to deal with the compat_ptr() conversion.
 538  */
 539 static int blkdev_common_ioctl(struct block_device *bdev, blk_mode_t mode,
 540                                unsigned int cmd, unsigned long arg,
 541                                void __user *argp)
 542 {
 543         unsigned int max_sectors;
 544
 545         switch (cmd) {
 546         case BLKFLSBUF:
 547                 return blkdev_flushbuf(bdev, cmd, arg);
 548         case BLKROSET:
 549                 return blkdev_roset(bdev, cmd, arg);
 550         case BLKDISCARD:
 551                 return blk_ioctl_discard(bdev, mode, arg);
 552         case BLKSECDISCARD:
 553                 return blk_ioctl_secure_erase(bdev, mode, argp);
 554         case BLKZEROOUT:
 555                 return blk_ioctl_zeroout(bdev, mode, arg);
 556         case BLKGETDISKSEQ:
 557                 return put_u64(argp, bdev->bd_disk->diskseq);
 558         case BLKREPORTZONE:
 559                 return blkdev_report_zones_ioctl(bdev, cmd, arg);
 560         case BLKRESETZONE:
 561         case BLKOPENZONE:
 562         case BLKCLOSEZONE:
 563         case BLKFINISHZONE:
 564                 return blkdev_zone_mgmt_ioctl(bdev, mode, cmd, arg);
 565         case BLKGETZONESZ:
 566                 return put_uint(argp, bdev_zone_sectors(bdev));
 567         case BLKGETNRZONES:
 568                 return put_uint(argp, bdev_nr_zones(bdev));
 569         case BLKROGET:
 570                 return put_int(argp, bdev_read_only(bdev) != 0);
 571         case BLKSSZGET: /* get block device logical block size */
 572                 return put_int(argp, bdev_logical_block_size(bdev));
 573         case BLKPBSZGET: /* get block device physical block size */
 574                 return put_uint(argp, bdev_physical_block_size(bdev));
 575         case BLKIOMIN:
 576                 return put_uint(argp, bdev_io_min(bdev));
 577         case BLKIOOPT:
 578                 return put_uint(argp, bdev_io_opt(bdev));
 579         case BLKALIGNOFF:
 580                 return put_int(argp, bdev_alignment_offset(bdev));
 581         case BLKDISCARDZEROES:
 582                 return put_uint(argp, 0);
 583         case BLKSECTGET:
 584                 max_sectors = min_t(unsigned int, USHRT_MAX,
 585                                     queue_max_sectors(bdev_get_queue(bdev)));
 586                 return put_ushort(argp, max_sectors);
 587         case BLKROTATIONAL:
 588                 return put_ushort(argp, !bdev_nonrot(bdev));
 589         case BLKRASET:
 590         case BLKFRASET:
 591                 if(!capable(CAP_SYS_ADMIN))
 592                         return -EACCES;
 593                 bdev->bd_disk->bdi->ra_pages = (arg * 512) / PAGE_SIZE;
 594                 return 0;
 595         case BLKRRPART:
 596                 if (!capable(CAP_SYS_ADMIN))
 597                         return -EACCES;
 598                 if (bdev_is_partition(bdev))
 599                         return -EINVAL;
 600                 return disk_scan_partitions(bdev->bd_disk,
 601                                 mode | BLK_OPEN_STRICT_SCAN);
 602         case BLKTRACESTART:
 603         case BLKTRACESTOP:
 604         case BLKTRACETEARDOWN:
 605                 return blk_trace_ioctl(bdev, cmd, argp);
 606         case IOC_PR_REGISTER:
 607                 return blkdev_pr_register(bdev, mode, argp);
 608         case IOC_PR_RESERVE:
 609                 return blkdev_pr_reserve(bdev, mode, argp);
 610         case IOC_PR_RELEASE:
 611                 return blkdev_pr_release(bdev, mode, argp);
 612         case IOC_PR_PREEMPT:
 613                 return blkdev_pr_preempt(bdev, mode, argp, false);
 614         case IOC_PR_PREEMPT_ABORT:
 615                 return blkdev_pr_preempt(bdev, mode, argp, true);
 616         case IOC_PR_CLEAR:
 617                 return blkdev_pr_clear(bdev, mode, argp);
 618         default:
 619                 return -ENOIOCTLCMD;
 620         }
 621 }
 622
 623 /*
 624  * Always keep this in sync with compat_blkdev_ioctl()
 625  * to handle all incompatible commands in both functions.
 626  *
 627  * New commands must be compatible and go into blkdev_common_ioctl
 628  */
 629 long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 630 {
 631         struct block_device *bdev = I_BDEV(file->f_mapping->host);
 632         void __user *argp = (void __user *)arg;
 633         blk_mode_t mode = file_to_blk_mode(file);
 634         int ret;
 635
 636         switch (cmd) {
 637         /* These need separate implementations for the data structure */
 638         case HDIO_GETGEO:
 639                 return blkdev_getgeo(bdev, argp);
 640         case BLKPG:
 641                 return blkpg_ioctl(bdev, argp);
 642
 643         /* Compat mode returns 32-bit data instead of 'long' */
 644         case BLKRAGET:
 645         case BLKFRAGET:
 646                 if (!argp)
 647                         return -EINVAL;
 648                 return put_long(argp,
 649                         (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
 650         case BLKGETSIZE:
 651                 if (bdev_nr_sectors(bdev) > ~0UL)
 652                         return -EFBIG;
 653                 return put_ulong(argp, bdev_nr_sectors(bdev));
 654
 655         /* The data is compatible, but the command number is different */
 656         case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
 657                 return put_int(argp, block_size(bdev));
 658         case BLKBSZSET:
 659                 return blkdev_bszset(file, mode, argp);
 660         case BLKGETSIZE64:
 661                 return put_u64(argp, bdev_nr_bytes(bdev));
 662
 663         /* Incompatible alignment on i386 */
 664         case BLKTRACESETUP:
 665                 return blk_trace_ioctl(bdev, cmd, argp);
 666         default:
 667                 break;
 668         }
 669
 670         ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
 671         if (ret != -ENOIOCTLCMD)
 672                 return ret;
 673
 674         if (!bdev->bd_disk->fops->ioctl)
 675                 return -ENOTTY;
 676         return bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg);
 677 }
 678
 679 #ifdef CONFIG_COMPAT
 680
 681 #define BLKBSZGET_32            _IOR(0x12, 112, int)
 682 #define BLKBSZSET_32            _IOW(0x12, 113, int)
 683 #define BLKGETSIZE64_32         _IOR(0x12, 114, int)
 684
 685 /* Most of the generic ioctls are handled in the normal fallback path.
 686    This assumes the blkdev's low level compat_ioctl always returns
 687    ENOIOCTLCMD for unknown ioctls. */
 688 long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 689 {
 690         int ret;
 691         void __user *argp = compat_ptr(arg);
 692         struct block_device *bdev = I_BDEV(file->f_mapping->host);
 693         struct gendisk *disk = bdev->bd_disk;
 694         blk_mode_t mode = file_to_blk_mode(file);
 695
 696         switch (cmd) {
 697         /* These need separate implementations for the data structure */
 698         case HDIO_GETGEO:
 699                 return compat_hdio_getgeo(bdev, argp);
 700         case BLKPG:
 701                 return compat_blkpg_ioctl(bdev, argp);
 702
 703         /* Compat mode returns 32-bit data instead of 'long' */
 704         case BLKRAGET:
 705         case BLKFRAGET:
 706                 if (!argp)
 707                         return -EINVAL;
 708                 return compat_put_long(argp,
 709                         (bdev->bd_disk->bdi->ra_pages * PAGE_SIZE) / 512);
 710         case BLKGETSIZE:
 711                 if (bdev_nr_sectors(bdev) > ~(compat_ulong_t)0)
 712                         return -EFBIG;
 713                 return compat_put_ulong(argp, bdev_nr_sectors(bdev));
 714
 715         /* The data is compatible, but the command number is different */
 716         case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
 717                 return put_int(argp, bdev_logical_block_size(bdev));
 718         case BLKBSZSET_32:
 719                 return blkdev_bszset(file, mode, argp);
 720         case BLKGETSIZE64_32:
 721                 return put_u64(argp, bdev_nr_bytes(bdev));
 722
 723         /* Incompatible alignment on i386 */
 724         case BLKTRACESETUP32:
 725                 return blk_trace_ioctl(bdev, cmd, argp);
 726         default:
 727                 break;
 728         }
 729
 730         ret = blkdev_common_ioctl(bdev, mode, cmd, arg, argp);
 731         if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
 732                 ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
 733
 734         return ret;
 735 }
 736 #endif