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