fs/ioctl.c

   1 /*
   2  *  linux/fs/ioctl.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 #include <linux/syscalls.h>
   8 #include <linux/mm.h>
   9 #include <linux/capability.h>
  10 #include <linux/file.h>
  11 #include <linux/fs.h>
  12 #include <linux/security.h>
  13 #include <linux/export.h>
  14 #include <linux/uaccess.h>
  15 #include <linux/writeback.h>
  16 #include <linux/buffer_head.h>
  17 #include <linux/falloc.h>
  18 #include <linux/sched/signal.h>
  19
  20 #include "internal.h"
  21
  22 #include <asm/ioctls.h>
  23
  24 /* So that the fiemap access checks can't overflow on 32 bit machines. */
  25 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
  26
  27 /**
  28  * vfs_ioctl - call filesystem specific ioctl methods
  29  * @filp:       open file to invoke ioctl method on
  30  * @cmd:        ioctl command to execute
  31  * @arg:        command-specific argument for ioctl
  32  *
  33  * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
  34  * returns -ENOTTY.
  35  *
  36  * Returns 0 on success, -errno on error.
  37  */
  38 long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  39 {
  40         int error = -ENOTTY;
  41
  42         if (!filp->f_op->unlocked_ioctl)
  43                 goto out;
  44
  45         error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
  46         if (error == -ENOIOCTLCMD)
  47                 error = -ENOTTY;
  48  out:
  49         return error;
  50 }
  51
  52 static int ioctl_fibmap(struct file *filp, int __user *p)
  53 {
  54         struct address_space *mapping = filp->f_mapping;
  55         int res, block;
  56
  57         /* do we support this mess? */
  58         if (!mapping->a_ops->bmap)
  59                 return -EINVAL;
  60         if (!capable(CAP_SYS_RAWIO))
  61                 return -EPERM;
  62         res = get_user(block, p);
  63         if (res)
  64                 return res;
  65         res = mapping->a_ops->bmap(mapping, block);
  66         return put_user(res, p);
  67 }
  68
  69 /**
  70  * fiemap_fill_next_extent - Fiemap helper function
  71  * @fieinfo:    Fiemap context passed into ->fiemap
  72  * @logical:    Extent logical start offset, in bytes
  73  * @phys:       Extent physical start offset, in bytes
  74  * @len:        Extent length, in bytes
  75  * @flags:      FIEMAP_EXTENT flags that describe this extent
  76  *
  77  * Called from file system ->fiemap callback. Will populate extent
  78  * info as passed in via arguments and copy to user memory. On
  79  * success, extent count on fieinfo is incremented.
  80  *
  81  * Returns 0 on success, -errno on error, 1 if this was the last
  82  * extent that will fit in user array.
  83  */
  84 #define SET_UNKNOWN_FLAGS       (FIEMAP_EXTENT_DELALLOC)
  85 #define SET_NO_UNMOUNTED_IO_FLAGS       (FIEMAP_EXTENT_DATA_ENCRYPTED)
  86 #define SET_NOT_ALIGNED_FLAGS   (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
  87 int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
  88                             u64 phys, u64 len, u32 flags)
  89 {
  90         struct fiemap_extent extent;
  91         struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
  92
  93         /* only count the extents */
  94         if (fieinfo->fi_extents_max == 0) {
  95                 fieinfo->fi_extents_mapped++;
  96                 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
  97         }
  98
  99         if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
 100                 return 1;
 101
 102         if (flags & SET_UNKNOWN_FLAGS)
 103                 flags |= FIEMAP_EXTENT_UNKNOWN;
 104         if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
 105                 flags |= FIEMAP_EXTENT_ENCODED;
 106         if (flags & SET_NOT_ALIGNED_FLAGS)
 107                 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
 108
 109         memset(&extent, 0, sizeof(extent));
 110         extent.fe_logical = logical;
 111         extent.fe_physical = phys;
 112         extent.fe_length = len;
 113         extent.fe_flags = flags;
 114
 115         dest += fieinfo->fi_extents_mapped;
 116         if (copy_to_user(dest, &extent, sizeof(extent)))
 117                 return -EFAULT;
 118
 119         fieinfo->fi_extents_mapped++;
 120         if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
 121                 return 1;
 122         return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
 123 }
 124 EXPORT_SYMBOL(fiemap_fill_next_extent);
 125
 126 /**
 127  * fiemap_check_flags - check validity of requested flags for fiemap
 128  * @fieinfo:    Fiemap context passed into ->fiemap
 129  * @fs_flags:   Set of fiemap flags that the file system understands
 130  *
 131  * Called from file system ->fiemap callback. This will compute the
 132  * intersection of valid fiemap flags and those that the fs supports. That
 133  * value is then compared against the user supplied flags. In case of bad user
 134  * flags, the invalid values will be written into the fieinfo structure, and
 135  * -EBADR is returned, which tells ioctl_fiemap() to return those values to
 136  * userspace. For this reason, a return code of -EBADR should be preserved.
 137  *
 138  * Returns 0 on success, -EBADR on bad flags.
 139  */
 140 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
 141 {
 142         u32 incompat_flags;
 143
 144         incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
 145         if (incompat_flags) {
 146                 fieinfo->fi_flags = incompat_flags;
 147                 return -EBADR;
 148         }
 149         return 0;
 150 }
 151 EXPORT_SYMBOL(fiemap_check_flags);
 152
 153 static int fiemap_check_ranges(struct super_block *sb,
 154                                u64 start, u64 len, u64 *new_len)
 155 {
 156         u64 maxbytes = (u64) sb->s_maxbytes;
 157
 158         *new_len = len;
 159
 160         if (len == 0)
 161                 return -EINVAL;
 162
 163         if (start > maxbytes)
 164                 return -EFBIG;
 165
 166         /*
 167          * Shrink request scope to what the fs can actually handle.
 168          */
 169         if (len > maxbytes || (maxbytes - len) < start)
 170                 *new_len = maxbytes - start;
 171
 172         return 0;
 173 }
 174
 175 static int ioctl_fiemap(struct file *filp, unsigned long arg)
 176 {
 177         struct fiemap fiemap;
 178         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
 179         struct fiemap_extent_info fieinfo = { 0, };
 180         struct inode *inode = file_inode(filp);
 181         struct super_block *sb = inode->i_sb;
 182         u64 len;
 183         int error;
 184
 185         if (!inode->i_op->fiemap)
 186                 return -EOPNOTSUPP;
 187
 188         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 189                 return -EFAULT;
 190
 191         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 192                 return -EINVAL;
 193
 194         error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
 195                                     &len);
 196         if (error)
 197                 return error;
 198
 199         fieinfo.fi_flags = fiemap.fm_flags;
 200         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 201         fieinfo.fi_extents_start = ufiemap->fm_extents;
 202
 203         if (fiemap.fm_extent_count != 0 &&
 204             !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
 205                        fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
 206                 return -EFAULT;
 207
 208         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
 209                 filemap_write_and_wait(inode->i_mapping);
 210
 211         error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
 212         fiemap.fm_flags = fieinfo.fi_flags;
 213         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 214         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 215                 error = -EFAULT;
 216
 217         return error;
 218 }
 219
 220 static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
 221                              u64 off, u64 olen, u64 destoff)
 222 {
 223         struct fd src_file = fdget(srcfd);
 224         int ret;
 225
 226         if (!src_file.file)
 227                 return -EBADF;
 228         ret = -EXDEV;
 229         if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
 230                 goto fdput;
 231         ret = do_clone_file_range(src_file.file, off, dst_file, destoff, olen);
 232 fdput:
 233         fdput(src_file);
 234         return ret;
 235 }
 236
 237 static long ioctl_file_clone_range(struct file *file, void __user *argp)
 238 {
 239         struct file_clone_range args;
 240
 241         if (copy_from_user(&args, argp, sizeof(args)))
 242                 return -EFAULT;
 243         return ioctl_file_clone(file, args.src_fd, args.src_offset,
 244                                 args.src_length, args.dest_offset);
 245 }
 246
 247 #ifdef CONFIG_BLOCK
 248
 249 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
 250 {
 251         return (offset >> inode->i_blkbits);
 252 }
 253
 254 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
 255 {
 256         return (blk << inode->i_blkbits);
 257 }
 258
 259 /**
 260  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
 261  * @inode: the inode to map
 262  * @fieinfo: the fiemap info struct that will be passed back to userspace
 263  * @start: where to start mapping in the inode
 264  * @len: how much space to map
 265  * @get_block: the fs's get_block function
 266  *
 267  * This does FIEMAP for block based inodes.  Basically it will just loop
 268  * through get_block until we hit the number of extents we want to map, or we
 269  * go past the end of the file and hit a hole.
 270  *
 271  * If it is possible to have data blocks beyond a hole past @inode->i_size, then
 272  * please do not use this function, it will stop at the first unmapped block
 273  * beyond i_size.
 274  *
 275  * If you use this function directly, you need to do your own locking. Use
 276  * generic_block_fiemap if you want the locking done for you.
 277  */
 278
 279 int __generic_block_fiemap(struct inode *inode,
 280                            struct fiemap_extent_info *fieinfo, loff_t start,
 281                            loff_t len, get_block_t *get_block)
 282 {
 283         struct buffer_head map_bh;
 284         sector_t start_blk, last_blk;
 285         loff_t isize = i_size_read(inode);
 286         u64 logical = 0, phys = 0, size = 0;
 287         u32 flags = FIEMAP_EXTENT_MERGED;
 288         bool past_eof = false, whole_file = false;
 289         int ret = 0;
 290
 291         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
 292         if (ret)
 293                 return ret;
 294
 295         /*
 296          * Either the i_mutex or other appropriate locking needs to be held
 297          * since we expect isize to not change at all through the duration of
 298          * this call.
 299          */
 300         if (len >= isize) {
 301                 whole_file = true;
 302                 len = isize;
 303         }
 304
 305         /*
 306          * Some filesystems can't deal with being asked to map less than
 307          * blocksize, so make sure our len is at least block length.
 308          */
 309         if (logical_to_blk(inode, len) == 0)
 310                 len = blk_to_logical(inode, 1);
 311
 312         start_blk = logical_to_blk(inode, start);
 313         last_blk = logical_to_blk(inode, start + len - 1);
 314
 315         do {
 316                 /*
 317                  * we set b_size to the total size we want so it will map as
 318                  * many contiguous blocks as possible at once
 319                  */
 320                 memset(&map_bh, 0, sizeof(struct buffer_head));
 321                 map_bh.b_size = len;
 322
 323                 ret = get_block(inode, start_blk, &map_bh, 0);
 324                 if (ret)
 325                         break;
 326
 327                 /* HOLE */
 328                 if (!buffer_mapped(&map_bh)) {
 329                         start_blk++;
 330
 331                         /*
 332                          * We want to handle the case where there is an
 333                          * allocated block at the front of the file, and then
 334                          * nothing but holes up to the end of the file properly,
 335                          * to make sure that extent at the front gets properly
 336                          * marked with FIEMAP_EXTENT_LAST
 337                          */
 338                         if (!past_eof &&
 339                             blk_to_logical(inode, start_blk) >= isize)
 340                                 past_eof = 1;
 341
 342                         /*
 343                          * First hole after going past the EOF, this is our
 344                          * last extent
 345                          */
 346                         if (past_eof && size) {
 347                                 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
 348                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 349                                                               phys, size,
 350                                                               flags);
 351                         } else if (size) {
 352                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 353                                                               phys, size, flags);
 354                                 size = 0;
 355                         }
 356
 357                         /* if we have holes up to/past EOF then we're done */
 358                         if (start_blk > last_blk || past_eof || ret)
 359                                 break;
 360                 } else {
 361                         /*
 362                          * We have gone over the length of what we wanted to
 363                          * map, and it wasn't the entire file, so add the extent
 364                          * we got last time and exit.
 365                          *
 366                          * This is for the case where say we want to map all the
 367                          * way up to the second to the last block in a file, but
 368                          * the last block is a hole, making the second to last
 369                          * block FIEMAP_EXTENT_LAST.  In this case we want to
 370                          * see if there is a hole after the second to last block
 371                          * so we can mark it properly.  If we found data after
 372                          * we exceeded the length we were requesting, then we
 373                          * are good to go, just add the extent to the fieinfo
 374                          * and break
 375                          */
 376                         if (start_blk > last_blk && !whole_file) {
 377                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 378                                                               phys, size,
 379                                                               flags);
 380                                 break;
 381                         }
 382
 383                         /*
 384                          * if size != 0 then we know we already have an extent
 385                          * to add, so add it.
 386                          */
 387                         if (size) {
 388                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 389                                                               phys, size,
 390                                                               flags);
 391                                 if (ret)
 392                                         break;
 393                         }
 394
 395                         logical = blk_to_logical(inode, start_blk);
 396                         phys = blk_to_logical(inode, map_bh.b_blocknr);
 397                         size = map_bh.b_size;
 398                         flags = FIEMAP_EXTENT_MERGED;
 399
 400                         start_blk += logical_to_blk(inode, size);
 401
 402                         /*
 403                          * If we are past the EOF, then we need to make sure as
 404                          * soon as we find a hole that the last extent we found
 405                          * is marked with FIEMAP_EXTENT_LAST
 406                          */
 407                         if (!past_eof && logical + size >= isize)
 408                                 past_eof = true;
 409                 }
 410                 cond_resched();
 411                 if (fatal_signal_pending(current)) {
 412                         ret = -EINTR;
 413                         break;
 414                 }
 415
 416         } while (1);
 417
 418         /* If ret is 1 then we just hit the end of the extent array */
 419         if (ret == 1)
 420                 ret = 0;
 421
 422         return ret;
 423 }
 424 EXPORT_SYMBOL(__generic_block_fiemap);
 425
 426 /**
 427  * generic_block_fiemap - FIEMAP for block based inodes
 428  * @inode: The inode to map
 429  * @fieinfo: The mapping information
 430  * @start: The initial block to map
 431  * @len: The length of the extect to attempt to map
 432  * @get_block: The block mapping function for the fs
 433  *
 434  * Calls __generic_block_fiemap to map the inode, after taking
 435  * the inode's mutex lock.
 436  */
 437
 438 int generic_block_fiemap(struct inode *inode,
 439                          struct fiemap_extent_info *fieinfo, u64 start,
 440                          u64 len, get_block_t *get_block)
 441 {
 442         int ret;
 443         inode_lock(inode);
 444         ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
 445         inode_unlock(inode);
 446         return ret;
 447 }
 448 EXPORT_SYMBOL(generic_block_fiemap);
 449
 450 #endif  /*  CONFIG_BLOCK  */
 451
 452 /*
 453  * This provides compatibility with legacy XFS pre-allocation ioctls
 454  * which predate the fallocate syscall.
 455  *
 456  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
 457  * are used here, rest are ignored.
 458  */
 459 int ioctl_preallocate(struct file *filp, void __user *argp)
 460 {
 461         struct inode *inode = file_inode(filp);
 462         struct space_resv sr;
 463
 464         if (copy_from_user(&sr, argp, sizeof(sr)))
 465                 return -EFAULT;
 466
 467         switch (sr.l_whence) {
 468         case SEEK_SET:
 469                 break;
 470         case SEEK_CUR:
 471                 sr.l_start += filp->f_pos;
 472                 break;
 473         case SEEK_END:
 474                 sr.l_start += i_size_read(inode);
 475                 break;
 476         default:
 477                 return -EINVAL;
 478         }
 479
 480         return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
 481 }
 482
 483 static int file_ioctl(struct file *filp, unsigned int cmd,
 484                 unsigned long arg)
 485 {
 486         struct inode *inode = file_inode(filp);
 487         int __user *p = (int __user *)arg;
 488
 489         switch (cmd) {
 490         case FIBMAP:
 491                 return ioctl_fibmap(filp, p);
 492         case FIONREAD:
 493                 return put_user(i_size_read(inode) - filp->f_pos, p);
 494         case FS_IOC_RESVSP:
 495         case FS_IOC_RESVSP64:
 496                 return ioctl_preallocate(filp, p);
 497         }
 498
 499         return vfs_ioctl(filp, cmd, arg);
 500 }
 501
 502 static int ioctl_fionbio(struct file *filp, int __user *argp)
 503 {
 504         unsigned int flag;
 505         int on, error;
 506
 507         error = get_user(on, argp);
 508         if (error)
 509                 return error;
 510         flag = O_NONBLOCK;
 511 #ifdef __sparc__
 512         /* SunOS compatibility item. */
 513         if (O_NONBLOCK != O_NDELAY)
 514                 flag |= O_NDELAY;
 515 #endif
 516         spin_lock(&filp->f_lock);
 517         if (on)
 518                 filp->f_flags |= flag;
 519         else
 520                 filp->f_flags &= ~flag;
 521         spin_unlock(&filp->f_lock);
 522         return error;
 523 }
 524
 525 static int ioctl_fioasync(unsigned int fd, struct file *filp,
 526                           int __user *argp)
 527 {
 528         unsigned int flag;
 529         int on, error;
 530
 531         error = get_user(on, argp);
 532         if (error)
 533                 return error;
 534         flag = on ? FASYNC : 0;
 535
 536         /* Did FASYNC state change ? */
 537         if ((flag ^ filp->f_flags) & FASYNC) {
 538                 if (filp->f_op->fasync)
 539                         /* fasync() adjusts filp->f_flags */
 540                         error = filp->f_op->fasync(fd, filp, on);
 541                 else
 542                         error = -ENOTTY;
 543         }
 544         return error < 0 ? error : 0;
 545 }
 546
 547 static int ioctl_fsfreeze(struct file *filp)
 548 {
 549         struct super_block *sb = file_inode(filp)->i_sb;
 550
 551         if (!capable(CAP_SYS_ADMIN))
 552                 return -EPERM;
 553
 554         /* If filesystem doesn't support freeze feature, return. */
 555         if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
 556                 return -EOPNOTSUPP;
 557
 558         /* Freeze */
 559         if (sb->s_op->freeze_super)
 560                 return sb->s_op->freeze_super(sb);
 561         return freeze_super(sb);
 562 }
 563
 564 static int ioctl_fsthaw(struct file *filp)
 565 {
 566         struct super_block *sb = file_inode(filp)->i_sb;
 567
 568         if (!capable(CAP_SYS_ADMIN))
 569                 return -EPERM;
 570
 571         /* Thaw */
 572         if (sb->s_op->thaw_super)
 573                 return sb->s_op->thaw_super(sb);
 574         return thaw_super(sb);
 575 }
 576
 577 static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
 578 {
 579         struct file_dedupe_range __user *argp = arg;
 580         struct file_dedupe_range *same = NULL;
 581         int ret;
 582         unsigned long size;
 583         u16 count;
 584
 585         if (get_user(count, &argp->dest_count)) {
 586                 ret = -EFAULT;
 587                 goto out;
 588         }
 589
 590         size = offsetof(struct file_dedupe_range __user, info[count]);
 591         if (size > PAGE_SIZE) {
 592                 ret = -ENOMEM;
 593                 goto out;
 594         }
 595
 596         same = memdup_user(argp, size);
 597         if (IS_ERR(same)) {
 598                 ret = PTR_ERR(same);
 599                 same = NULL;
 600                 goto out;
 601         }
 602
 603         same->dest_count = count;
 604         ret = vfs_dedupe_file_range(file, same);
 605         if (ret)
 606                 goto out;
 607
 608         ret = copy_to_user(argp, same, size);
 609         if (ret)
 610                 ret = -EFAULT;
 611
 612 out:
 613         kfree(same);
 614         return ret;
 615 }
 616
 617 /*
 618  * When you add any new common ioctls to the switches above and below
 619  * please update compat_sys_ioctl() too.
 620  *
 621  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 622  * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 623  */
 624 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 625              unsigned long arg)
 626 {
 627         int error = 0;
 628         int __user *argp = (int __user *)arg;
 629         struct inode *inode = file_inode(filp);
 630
 631         switch (cmd) {
 632         case FIOCLEX:
 633                 set_close_on_exec(fd, 1);
 634                 break;
 635
 636         case FIONCLEX:
 637                 set_close_on_exec(fd, 0);
 638                 break;
 639
 640         case FIONBIO:
 641                 error = ioctl_fionbio(filp, argp);
 642                 break;
 643
 644         case FIOASYNC:
 645                 error = ioctl_fioasync(fd, filp, argp);
 646                 break;
 647
 648         case FIOQSIZE:
 649                 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
 650                     S_ISLNK(inode->i_mode)) {
 651                         loff_t res = inode_get_bytes(inode);
 652                         error = copy_to_user(argp, &res, sizeof(res)) ?
 653                                         -EFAULT : 0;
 654                 } else
 655                         error = -ENOTTY;
 656                 break;
 657
 658         case FIFREEZE:
 659                 error = ioctl_fsfreeze(filp);
 660                 break;
 661
 662         case FITHAW:
 663                 error = ioctl_fsthaw(filp);
 664                 break;
 665
 666         case FS_IOC_FIEMAP:
 667                 return ioctl_fiemap(filp, arg);
 668
 669         case FIGETBSZ:
 670                 return put_user(inode->i_sb->s_blocksize, argp);
 671
 672         case FICLONE:
 673                 return ioctl_file_clone(filp, arg, 0, 0, 0);
 674
 675         case FICLONERANGE:
 676                 return ioctl_file_clone_range(filp, argp);
 677
 678         case FIDEDUPERANGE:
 679                 return ioctl_file_dedupe_range(filp, argp);
 680
 681         default:
 682                 if (S_ISREG(inode->i_mode))
 683                         error = file_ioctl(filp, cmd, arg);
 684                 else
 685                         error = vfs_ioctl(filp, cmd, arg);
 686                 break;
 687         }
 688         return error;
 689 }
 690
 691 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
 692 {
 693         int error;
 694         struct fd f = fdget(fd);
 695
 696         if (!f.file)
 697                 return -EBADF;
 698         error = security_file_ioctl(f.file, cmd, arg);
 699         if (!error)
 700                 error = do_vfs_ioctl(f.file, fd, cmd, arg);
 701         fdput(f);
 702         return error;
 703 }