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