fs/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/ioctl.c
   4  *
   5  *  Copyright (C) 1991, 1992  Linus Torvalds
   6  */
   7
   8 #include <linux/syscalls.h>
   9 #include <linux/mm.h>
  10 #include <linux/capability.h>
  11 #include <linux/file.h>
  12 #include <linux/fs.h>
  13 #include <linux/security.h>
  14 #include <linux/export.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/writeback.h>
  17 #include <linux/buffer_head.h>
  18 #include <linux/falloc.h>
  19 #include <linux/sched/signal.h>
  20
  21 #include "internal.h"
  22
  23 #include <asm/ioctls.h>
  24
  25 /* So that the fiemap access checks can't overflow on 32 bit machines. */
  26 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
  27
  28 /**
  29  * vfs_ioctl - call filesystem specific ioctl methods
  30  * @filp:       open file to invoke ioctl method on
  31  * @cmd:        ioctl command to execute
  32  * @arg:        command-specific argument for ioctl
  33  *
  34  * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
  35  * returns -ENOTTY.
  36  *
  37  * Returns 0 on success, -errno on error.
  38  */
  39 long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  40 {
  41         int error = -ENOTTY;
  42
  43         if (!filp->f_op->unlocked_ioctl)
  44                 goto out;
  45
  46         error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
  47         if (error == -ENOIOCTLCMD)
  48                 error = -ENOTTY;
  49  out:
  50         return error;
  51 }
  52
  53 static int ioctl_fibmap(struct file *filp, int __user *p)
  54 {
  55         struct address_space *mapping = filp->f_mapping;
  56         int res, block;
  57
  58         /* do we support this mess? */
  59         if (!mapping->a_ops->bmap)
  60                 return -EINVAL;
  61         if (!capable(CAP_SYS_RAWIO))
  62                 return -EPERM;
  63         res = get_user(block, p);
  64         if (res)
  65                 return res;
  66         res = mapping->a_ops->bmap(mapping, block);
  67         return put_user(res, p);
  68 }
  69
  70 /**
  71  * fiemap_fill_next_extent - Fiemap helper function
  72  * @fieinfo:    Fiemap context passed into ->fiemap
  73  * @logical:    Extent logical start offset, in bytes
  74  * @phys:       Extent physical start offset, in bytes
  75  * @len:        Extent length, in bytes
  76  * @flags:      FIEMAP_EXTENT flags that describe this extent
  77  *
  78  * Called from file system ->fiemap callback. Will populate extent
  79  * info as passed in via arguments and copy to user memory. On
  80  * success, extent count on fieinfo is incremented.
  81  *
  82  * Returns 0 on success, -errno on error, 1 if this was the last
  83  * extent that will fit in user array.
  84  */
  85 #define SET_UNKNOWN_FLAGS       (FIEMAP_EXTENT_DELALLOC)
  86 #define SET_NO_UNMOUNTED_IO_FLAGS       (FIEMAP_EXTENT_DATA_ENCRYPTED)
  87 #define SET_NOT_ALIGNED_FLAGS   (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
  88 int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
  89                             u64 phys, u64 len, u32 flags)
  90 {
  91         struct fiemap_extent extent;
  92         struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
  93
  94         /* only count the extents */
  95         if (fieinfo->fi_extents_max == 0) {
  96                 fieinfo->fi_extents_mapped++;
  97                 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
  98         }
  99
 100         if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
 101                 return 1;
 102
 103         if (flags & SET_UNKNOWN_FLAGS)
 104                 flags |= FIEMAP_EXTENT_UNKNOWN;
 105         if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
 106                 flags |= FIEMAP_EXTENT_ENCODED;
 107         if (flags & SET_NOT_ALIGNED_FLAGS)
 108                 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
 109
 110         memset(&extent, 0, sizeof(extent));
 111         extent.fe_logical = logical;
 112         extent.fe_physical = phys;
 113         extent.fe_length = len;
 114         extent.fe_flags = flags;
 115
 116         dest += fieinfo->fi_extents_mapped;
 117         if (copy_to_user(dest, &extent, sizeof(extent)))
 118                 return -EFAULT;
 119
 120         fieinfo->fi_extents_mapped++;
 121         if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
 122                 return 1;
 123         return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
 124 }
 125 EXPORT_SYMBOL(fiemap_fill_next_extent);
 126
 127 /**
 128  * fiemap_check_flags - check validity of requested flags for fiemap
 129  * @fieinfo:    Fiemap context passed into ->fiemap
 130  * @fs_flags:   Set of fiemap flags that the file system understands
 131  *
 132  * Called from file system ->fiemap callback. This will compute the
 133  * intersection of valid fiemap flags and those that the fs supports. That
 134  * value is then compared against the user supplied flags. In case of bad user
 135  * flags, the invalid values will be written into the fieinfo structure, and
 136  * -EBADR is returned, which tells ioctl_fiemap() to return those values to
 137  * userspace. For this reason, a return code of -EBADR should be preserved.
 138  *
 139  * Returns 0 on success, -EBADR on bad flags.
 140  */
 141 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
 142 {
 143         u32 incompat_flags;
 144
 145         incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
 146         if (incompat_flags) {
 147                 fieinfo->fi_flags = incompat_flags;
 148                 return -EBADR;
 149         }
 150         return 0;
 151 }
 152 EXPORT_SYMBOL(fiemap_check_flags);
 153
 154 static int fiemap_check_ranges(struct super_block *sb,
 155                                u64 start, u64 len, u64 *new_len)
 156 {
 157         u64 maxbytes = (u64) sb->s_maxbytes;
 158
 159         *new_len = len;
 160
 161         if (len == 0)
 162                 return -EINVAL;
 163
 164         if (start > maxbytes)
 165                 return -EFBIG;
 166
 167         /*
 168          * Shrink request scope to what the fs can actually handle.
 169          */
 170         if (len > maxbytes || (maxbytes - len) < start)
 171                 *new_len = maxbytes - start;
 172
 173         return 0;
 174 }
 175
 176 static int ioctl_fiemap(struct file *filp, unsigned long arg)
 177 {
 178         struct fiemap fiemap;
 179         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
 180         struct fiemap_extent_info fieinfo = { 0, };
 181         struct inode *inode = file_inode(filp);
 182         struct super_block *sb = inode->i_sb;
 183         u64 len;
 184         int error;
 185
 186         if (!inode->i_op->fiemap)
 187                 return -EOPNOTSUPP;
 188
 189         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 190                 return -EFAULT;
 191
 192         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 193                 return -EINVAL;
 194
 195         error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
 196                                     &len);
 197         if (error)
 198                 return error;
 199
 200         fieinfo.fi_flags = fiemap.fm_flags;
 201         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 202         fieinfo.fi_extents_start = ufiemap->fm_extents;
 203
 204         if (fiemap.fm_extent_count != 0 &&
 205             !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
 206                        fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
 207                 return -EFAULT;
 208
 209         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
 210                 filemap_write_and_wait(inode->i_mapping);
 211
 212         error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
 213         fiemap.fm_flags = fieinfo.fi_flags;
 214         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 215         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 216                 error = -EFAULT;
 217
 218         return error;
 219 }
 220
 221 static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
 222                              u64 off, u64 olen, u64 destoff)
 223 {
 224         struct fd src_file = fdget(srcfd);
 225         int ret;
 226
 227         if (!src_file.file)
 228                 return -EBADF;
 229         ret = -EXDEV;
 230         if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
 231                 goto fdput;
 232         ret = do_clone_file_range(src_file.file, off, dst_file, destoff, olen);
 233 fdput:
 234         fdput(src_file);
 235         return ret;
 236 }
 237
 238 static long ioctl_file_clone_range(struct file *file, void __user *argp)
 239 {
 240         struct file_clone_range args;
 241
 242         if (copy_from_user(&args, argp, sizeof(args)))
 243                 return -EFAULT;
 244         return ioctl_file_clone(file, args.src_fd, args.src_offset,
 245                                 args.src_length, args.dest_offset);
 246 }
 247
 248 #ifdef CONFIG_BLOCK
 249
 250 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
 251 {
 252         return (offset >> inode->i_blkbits);
 253 }
 254
 255 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
 256 {
 257         return (blk << inode->i_blkbits);
 258 }
 259
 260 /**
 261  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
 262  * @inode: the inode to map
 263  * @fieinfo: the fiemap info struct that will be passed back to userspace
 264  * @start: where to start mapping in the inode
 265  * @len: how much space to map
 266  * @get_block: the fs's get_block function
 267  *
 268  * This does FIEMAP for block based inodes.  Basically it will just loop
 269  * through get_block until we hit the number of extents we want to map, or we
 270  * go past the end of the file and hit a hole.
 271  *
 272  * If it is possible to have data blocks beyond a hole past @inode->i_size, then
 273  * please do not use this function, it will stop at the first unmapped block
 274  * beyond i_size.
 275  *
 276  * If you use this function directly, you need to do your own locking. Use
 277  * generic_block_fiemap if you want the locking done for you.
 278  */
 279
 280 int __generic_block_fiemap(struct inode *inode,
 281                            struct fiemap_extent_info *fieinfo, loff_t start,
 282                            loff_t len, get_block_t *get_block)
 283 {
 284         struct buffer_head map_bh;
 285         sector_t start_blk, last_blk;
 286         loff_t isize = i_size_read(inode);
 287         u64 logical = 0, phys = 0, size = 0;
 288         u32 flags = FIEMAP_EXTENT_MERGED;
 289         bool past_eof = false, whole_file = false;
 290         int ret = 0;
 291
 292         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
 293         if (ret)
 294                 return ret;
 295
 296         /*
 297          * Either the i_mutex or other appropriate locking needs to be held
 298          * since we expect isize to not change at all through the duration of
 299          * this call.
 300          */
 301         if (len >= isize) {
 302                 whole_file = true;
 303                 len = isize;
 304         }
 305
 306         /*
 307          * Some filesystems can't deal with being asked to map less than
 308          * blocksize, so make sure our len is at least block length.
 309          */
 310         if (logical_to_blk(inode, len) == 0)
 311                 len = blk_to_logical(inode, 1);
 312
 313         start_blk = logical_to_blk(inode, start);
 314         last_blk = logical_to_blk(inode, start + len - 1);
 315
 316         do {
 317                 /*
 318                  * we set b_size to the total size we want so it will map as
 319                  * many contiguous blocks as possible at once
 320                  */
 321                 memset(&map_bh, 0, sizeof(struct buffer_head));
 322                 map_bh.b_size = len;
 323
 324                 ret = get_block(inode, start_blk, &map_bh, 0);
 325                 if (ret)
 326                         break;
 327
 328                 /* HOLE */
 329                 if (!buffer_mapped(&map_bh)) {
 330                         start_blk++;
 331
 332                         /*
 333                          * We want to handle the case where there is an
 334                          * allocated block at the front of the file, and then
 335                          * nothing but holes up to the end of the file properly,
 336                          * to make sure that extent at the front gets properly
 337                          * marked with FIEMAP_EXTENT_LAST
 338                          */
 339                         if (!past_eof &&
 340                             blk_to_logical(inode, start_blk) >= isize)
 341                                 past_eof = 1;
 342
 343                         /*
 344                          * First hole after going past the EOF, this is our
 345                          * last extent
 346                          */
 347                         if (past_eof && size) {
 348                                 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
 349                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 350                                                               phys, size,
 351                                                               flags);
 352                         } else if (size) {
 353                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 354                                                               phys, size, flags);
 355                                 size = 0;
 356                         }
 357
 358                         /* if we have holes up to/past EOF then we're done */
 359                         if (start_blk > last_blk || past_eof || ret)
 360                                 break;
 361                 } else {
 362                         /*
 363                          * We have gone over the length of what we wanted to
 364                          * map, and it wasn't the entire file, so add the extent
 365                          * we got last time and exit.
 366                          *
 367                          * This is for the case where say we want to map all the
 368                          * way up to the second to the last block in a file, but
 369                          * the last block is a hole, making the second to last
 370                          * block FIEMAP_EXTENT_LAST.  In this case we want to
 371                          * see if there is a hole after the second to last block
 372                          * so we can mark it properly.  If we found data after
 373                          * we exceeded the length we were requesting, then we
 374                          * are good to go, just add the extent to the fieinfo
 375                          * and break
 376                          */
 377                         if (start_blk > last_blk && !whole_file) {
 378                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 379                                                               phys, size,
 380                                                               flags);
 381                                 break;
 382                         }
 383
 384                         /*
 385                          * if size != 0 then we know we already have an extent
 386                          * to add, so add it.
 387                          */
 388                         if (size) {
 389                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 390                                                               phys, size,
 391                                                               flags);
 392                                 if (ret)
 393                                         break;
 394                         }
 395
 396                         logical = blk_to_logical(inode, start_blk);
 397                         phys = blk_to_logical(inode, map_bh.b_blocknr);
 398                         size = map_bh.b_size;
 399                         flags = FIEMAP_EXTENT_MERGED;
 400
 401                         start_blk += logical_to_blk(inode, size);
 402
 403                         /*
 404                          * If we are past the EOF, then we need to make sure as
 405                          * soon as we find a hole that the last extent we found
 406                          * is marked with FIEMAP_EXTENT_LAST
 407                          */
 408                         if (!past_eof && logical + size >= isize)
 409                                 past_eof = true;
 410                 }
 411                 cond_resched();
 412                 if (fatal_signal_pending(current)) {
 413                         ret = -EINTR;
 414                         break;
 415                 }
 416
 417         } while (1);
 418
 419         /* If ret is 1 then we just hit the end of the extent array */
 420         if (ret == 1)
 421                 ret = 0;
 422
 423         return ret;
 424 }
 425 EXPORT_SYMBOL(__generic_block_fiemap);
 426
 427 /**
 428  * generic_block_fiemap - FIEMAP for block based inodes
 429  * @inode: The inode to map
 430  * @fieinfo: The mapping information
 431  * @start: The initial block to map
 432  * @len: The length of the extect to attempt to map
 433  * @get_block: The block mapping function for the fs
 434  *
 435  * Calls __generic_block_fiemap to map the inode, after taking
 436  * the inode's mutex lock.
 437  */
 438
 439 int generic_block_fiemap(struct inode *inode,
 440                          struct fiemap_extent_info *fieinfo, u64 start,
 441                          u64 len, get_block_t *get_block)
 442 {
 443         int ret;
 444         inode_lock(inode);
 445         ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
 446         inode_unlock(inode);
 447         return ret;
 448 }
 449 EXPORT_SYMBOL(generic_block_fiemap);
 450
 451 #endif  /*  CONFIG_BLOCK  */
 452
 453 /*
 454  * This provides compatibility with legacy XFS pre-allocation ioctls
 455  * which predate the fallocate syscall.
 456  *
 457  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
 458  * are used here, rest are ignored.
 459  */
 460 int ioctl_preallocate(struct file *filp, void __user *argp)
 461 {
 462         struct inode *inode = file_inode(filp);
 463         struct space_resv sr;
 464
 465         if (copy_from_user(&sr, argp, sizeof(sr)))
 466                 return -EFAULT;
 467
 468         switch (sr.l_whence) {
 469         case SEEK_SET:
 470                 break;
 471         case SEEK_CUR:
 472                 sr.l_start += filp->f_pos;
 473                 break;
 474         case SEEK_END:
 475                 sr.l_start += i_size_read(inode);
 476                 break;
 477         default:
 478                 return -EINVAL;
 479         }
 480
 481         return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
 482 }
 483
 484 static int file_ioctl(struct file *filp, unsigned int cmd,
 485                 unsigned long arg)
 486 {
 487         struct inode *inode = file_inode(filp);
 488         int __user *p = (int __user *)arg;
 489
 490         switch (cmd) {
 491         case FIBMAP:
 492                 return ioctl_fibmap(filp, p);
 493         case FIONREAD:
 494                 return put_user(i_size_read(inode) - filp->f_pos, p);
 495         case FS_IOC_RESVSP:
 496         case FS_IOC_RESVSP64:
 497                 return ioctl_preallocate(filp, p);
 498         }
 499
 500         return vfs_ioctl(filp, cmd, arg);
 501 }
 502
 503 static int ioctl_fionbio(struct file *filp, int __user *argp)
 504 {
 505         unsigned int flag;
 506         int on, error;
 507
 508         error = get_user(on, argp);
 509         if (error)
 510                 return error;
 511         flag = O_NONBLOCK;
 512 #ifdef __sparc__
 513         /* SunOS compatibility item. */
 514         if (O_NONBLOCK != O_NDELAY)
 515                 flag |= O_NDELAY;
 516 #endif
 517         spin_lock(&filp->f_lock);
 518         if (on)
 519                 filp->f_flags |= flag;
 520         else
 521                 filp->f_flags &= ~flag;
 522         spin_unlock(&filp->f_lock);
 523         return error;
 524 }
 525
 526 static int ioctl_fioasync(unsigned int fd, struct file *filp,
 527                           int __user *argp)
 528 {
 529         unsigned int flag;
 530         int on, error;
 531
 532         error = get_user(on, argp);
 533         if (error)
 534                 return error;
 535         flag = on ? FASYNC : 0;
 536
 537         /* Did FASYNC state change ? */
 538         if ((flag ^ filp->f_flags) & FASYNC) {
 539                 if (filp->f_op->fasync)
 540                         /* fasync() adjusts filp->f_flags */
 541                         error = filp->f_op->fasync(fd, filp, on);
 542                 else
 543                         error = -ENOTTY;
 544         }
 545         return error < 0 ? error : 0;
 546 }
 547
 548 static int ioctl_fsfreeze(struct file *filp)
 549 {
 550         struct super_block *sb = file_inode(filp)->i_sb;
 551
 552         if (!capable(CAP_SYS_ADMIN))
 553                 return -EPERM;
 554
 555         /* If filesystem doesn't support freeze feature, return. */
 556         if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
 557                 return -EOPNOTSUPP;
 558
 559         /* Freeze */
 560         if (sb->s_op->freeze_super)
 561                 return sb->s_op->freeze_super(sb);
 562         return freeze_super(sb);
 563 }
 564
 565 static int ioctl_fsthaw(struct file *filp)
 566 {
 567         struct super_block *sb = file_inode(filp)->i_sb;
 568
 569         if (!capable(CAP_SYS_ADMIN))
 570                 return -EPERM;
 571
 572         /* Thaw */
 573         if (sb->s_op->thaw_super)
 574                 return sb->s_op->thaw_super(sb);
 575         return thaw_super(sb);
 576 }
 577
 578 static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
 579 {
 580         struct file_dedupe_range __user *argp = arg;
 581         struct file_dedupe_range *same = NULL;
 582         int ret;
 583         unsigned long size;
 584         u16 count;
 585
 586         if (get_user(count, &argp->dest_count)) {
 587                 ret = -EFAULT;
 588                 goto out;
 589         }
 590
 591         size = offsetof(struct file_dedupe_range __user, info[count]);
 592         if (size > PAGE_SIZE) {
 593                 ret = -ENOMEM;
 594                 goto out;
 595         }
 596
 597         same = memdup_user(argp, size);
 598         if (IS_ERR(same)) {
 599                 ret = PTR_ERR(same);
 600                 same = NULL;
 601                 goto out;
 602         }
 603
 604         same->dest_count = count;
 605         ret = vfs_dedupe_file_range(file, same);
 606         if (ret)
 607                 goto out;
 608
 609         ret = copy_to_user(argp, same, size);
 610         if (ret)
 611                 ret = -EFAULT;
 612
 613 out:
 614         kfree(same);
 615         return ret;
 616 }
 617
 618 /*
 619  * When you add any new common ioctls to the switches above and below
 620  * please update compat_sys_ioctl() too.
 621  *
 622  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 623  * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 624  */
 625 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 626              unsigned long arg)
 627 {
 628         int error = 0;
 629         int __user *argp = (int __user *)arg;
 630         struct inode *inode = file_inode(filp);
 631
 632         switch (cmd) {
 633         case FIOCLEX:
 634                 set_close_on_exec(fd, 1);
 635                 break;
 636
 637         case FIONCLEX:
 638                 set_close_on_exec(fd, 0);
 639                 break;
 640
 641         case FIONBIO:
 642                 error = ioctl_fionbio(filp, argp);
 643                 break;
 644
 645         case FIOASYNC:
 646                 error = ioctl_fioasync(fd, filp, argp);
 647                 break;
 648
 649         case FIOQSIZE:
 650                 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
 651                     S_ISLNK(inode->i_mode)) {
 652                         loff_t res = inode_get_bytes(inode);
 653                         error = copy_to_user(argp, &res, sizeof(res)) ?
 654                                         -EFAULT : 0;
 655                 } else
 656                         error = -ENOTTY;
 657                 break;
 658
 659         case FIFREEZE:
 660                 error = ioctl_fsfreeze(filp);
 661                 break;
 662
 663         case FITHAW:
 664                 error = ioctl_fsthaw(filp);
 665                 break;
 666
 667         case FS_IOC_FIEMAP:
 668                 return ioctl_fiemap(filp, arg);
 669
 670         case FIGETBSZ:
 671                 return put_user(inode->i_sb->s_blocksize, argp);
 672
 673         case FICLONE:
 674                 return ioctl_file_clone(filp, arg, 0, 0, 0);
 675
 676         case FICLONERANGE:
 677                 return ioctl_file_clone_range(filp, argp);
 678
 679         case FIDEDUPERANGE:
 680                 return ioctl_file_dedupe_range(filp, argp);
 681
 682         default:
 683                 if (S_ISREG(inode->i_mode))
 684                         error = file_ioctl(filp, cmd, arg);
 685                 else
 686                         error = vfs_ioctl(filp, cmd, arg);
 687                 break;
 688         }
 689         return error;
 690 }
 691
 692 int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 693 {
 694         int error;
 695         struct fd f = fdget(fd);
 696
 697         if (!f.file)
 698                 return -EBADF;
 699         error = security_file_ioctl(f.file, cmd, arg);
 700         if (!error)
 701                 error = do_vfs_ioctl(f.file, fd, cmd, arg);
 702         fdput(f);
 703         return error;
 704 }
 705
 706 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
 707 {
 708         return ksys_ioctl(fd, cmd, arg);
 709 }