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 EXPORT_SYMBOL(vfs_ioctl);
  53
  54 static int ioctl_fibmap(struct file *filp, int __user *p)
  55 {
  56         struct address_space *mapping = filp->f_mapping;
  57         int res, block;
  58
  59         /* do we support this mess? */
  60         if (!mapping->a_ops->bmap)
  61                 return -EINVAL;
  62         if (!capable(CAP_SYS_RAWIO))
  63                 return -EPERM;
  64         res = get_user(block, p);
  65         if (res)
  66                 return res;
  67         res = mapping->a_ops->bmap(mapping, block);
  68         return put_user(res, p);
  69 }
  70
  71 /**
  72  * fiemap_fill_next_extent - Fiemap helper function
  73  * @fieinfo:    Fiemap context passed into ->fiemap
  74  * @logical:    Extent logical start offset, in bytes
  75  * @phys:       Extent physical start offset, in bytes
  76  * @len:        Extent length, in bytes
  77  * @flags:      FIEMAP_EXTENT flags that describe this extent
  78  *
  79  * Called from file system ->fiemap callback. Will populate extent
  80  * info as passed in via arguments and copy to user memory. On
  81  * success, extent count on fieinfo is incremented.
  82  *
  83  * Returns 0 on success, -errno on error, 1 if this was the last
  84  * extent that will fit in user array.
  85  */
  86 #define SET_UNKNOWN_FLAGS       (FIEMAP_EXTENT_DELALLOC)
  87 #define SET_NO_UNMOUNTED_IO_FLAGS       (FIEMAP_EXTENT_DATA_ENCRYPTED)
  88 #define SET_NOT_ALIGNED_FLAGS   (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
  89 int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
  90                             u64 phys, u64 len, u32 flags)
  91 {
  92         struct fiemap_extent extent;
  93         struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
  94
  95         /* only count the extents */
  96         if (fieinfo->fi_extents_max == 0) {
  97                 fieinfo->fi_extents_mapped++;
  98                 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
  99         }
 100
 101         if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
 102                 return 1;
 103
 104         if (flags & SET_UNKNOWN_FLAGS)
 105                 flags |= FIEMAP_EXTENT_UNKNOWN;
 106         if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
 107                 flags |= FIEMAP_EXTENT_ENCODED;
 108         if (flags & SET_NOT_ALIGNED_FLAGS)
 109                 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
 110
 111         memset(&extent, 0, sizeof(extent));
 112         extent.fe_logical = logical;
 113         extent.fe_physical = phys;
 114         extent.fe_length = len;
 115         extent.fe_flags = flags;
 116
 117         dest += fieinfo->fi_extents_mapped;
 118         if (copy_to_user(dest, &extent, sizeof(extent)))
 119                 return -EFAULT;
 120
 121         fieinfo->fi_extents_mapped++;
 122         if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
 123                 return 1;
 124         return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
 125 }
 126 EXPORT_SYMBOL(fiemap_fill_next_extent);
 127
 128 /**
 129  * fiemap_check_flags - check validity of requested flags for fiemap
 130  * @fieinfo:    Fiemap context passed into ->fiemap
 131  * @fs_flags:   Set of fiemap flags that the file system understands
 132  *
 133  * Called from file system ->fiemap callback. This will compute the
 134  * intersection of valid fiemap flags and those that the fs supports. That
 135  * value is then compared against the user supplied flags. In case of bad user
 136  * flags, the invalid values will be written into the fieinfo structure, and
 137  * -EBADR is returned, which tells ioctl_fiemap() to return those values to
 138  * userspace. For this reason, a return code of -EBADR should be preserved.
 139  *
 140  * Returns 0 on success, -EBADR on bad flags.
 141  */
 142 int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
 143 {
 144         u32 incompat_flags;
 145
 146         incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
 147         if (incompat_flags) {
 148                 fieinfo->fi_flags = incompat_flags;
 149                 return -EBADR;
 150         }
 151         return 0;
 152 }
 153 EXPORT_SYMBOL(fiemap_check_flags);
 154
 155 static int fiemap_check_ranges(struct super_block *sb,
 156                                u64 start, u64 len, u64 *new_len)
 157 {
 158         u64 maxbytes = (u64) sb->s_maxbytes;
 159
 160         *new_len = len;
 161
 162         if (len == 0)
 163                 return -EINVAL;
 164
 165         if (start > maxbytes)
 166                 return -EFBIG;
 167
 168         /*
 169          * Shrink request scope to what the fs can actually handle.
 170          */
 171         if (len > maxbytes || (maxbytes - len) < start)
 172                 *new_len = maxbytes - start;
 173
 174         return 0;
 175 }
 176
 177 static int ioctl_fiemap(struct file *filp, unsigned long arg)
 178 {
 179         struct fiemap fiemap;
 180         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
 181         struct fiemap_extent_info fieinfo = { 0, };
 182         struct inode *inode = file_inode(filp);
 183         struct super_block *sb = inode->i_sb;
 184         u64 len;
 185         int error;
 186
 187         if (!inode->i_op->fiemap)
 188                 return -EOPNOTSUPP;
 189
 190         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 191                 return -EFAULT;
 192
 193         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 194                 return -EINVAL;
 195
 196         error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
 197                                     &len);
 198         if (error)
 199                 return error;
 200
 201         fieinfo.fi_flags = fiemap.fm_flags;
 202         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 203         fieinfo.fi_extents_start = ufiemap->fm_extents;
 204
 205         if (fiemap.fm_extent_count != 0 &&
 206             !access_ok(VERIFY_WRITE, fieinfo.fi_extents_start,
 207                        fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
 208                 return -EFAULT;
 209
 210         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
 211                 filemap_write_and_wait(inode->i_mapping);
 212
 213         error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, len);
 214         fiemap.fm_flags = fieinfo.fi_flags;
 215         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 216         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 217                 error = -EFAULT;
 218
 219         return error;
 220 }
 221
 222 static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
 223                              u64 off, u64 olen, u64 destoff)
 224 {
 225         struct fd src_file = fdget(srcfd);
 226         int ret;
 227
 228         if (!src_file.file)
 229                 return -EBADF;
 230         ret = -EXDEV;
 231         if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
 232                 goto fdput;
 233         ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
 234 fdput:
 235         fdput(src_file);
 236         return ret;
 237 }
 238
 239 static long ioctl_file_clone_range(struct file *file, void __user *argp)
 240 {
 241         struct file_clone_range args;
 242
 243         if (copy_from_user(&args, argp, sizeof(args)))
 244                 return -EFAULT;
 245         return ioctl_file_clone(file, args.src_fd, args.src_offset,
 246                                 args.src_length, args.dest_offset);
 247 }
 248
 249 #ifdef CONFIG_BLOCK
 250
 251 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
 252 {
 253         return (offset >> inode->i_blkbits);
 254 }
 255
 256 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
 257 {
 258         return (blk << inode->i_blkbits);
 259 }
 260
 261 /**
 262  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
 263  * @inode: the inode to map
 264  * @fieinfo: the fiemap info struct that will be passed back to userspace
 265  * @start: where to start mapping in the inode
 266  * @len: how much space to map
 267  * @get_block: the fs's get_block function
 268  *
 269  * This does FIEMAP for block based inodes.  Basically it will just loop
 270  * through get_block until we hit the number of extents we want to map, or we
 271  * go past the end of the file and hit a hole.
 272  *
 273  * If it is possible to have data blocks beyond a hole past @inode->i_size, then
 274  * please do not use this function, it will stop at the first unmapped block
 275  * beyond i_size.
 276  *
 277  * If you use this function directly, you need to do your own locking. Use
 278  * generic_block_fiemap if you want the locking done for you.
 279  */
 280
 281 int __generic_block_fiemap(struct inode *inode,
 282                            struct fiemap_extent_info *fieinfo, loff_t start,
 283                            loff_t len, get_block_t *get_block)
 284 {
 285         struct buffer_head map_bh;
 286         sector_t start_blk, last_blk;
 287         loff_t isize = i_size_read(inode);
 288         u64 logical = 0, phys = 0, size = 0;
 289         u32 flags = FIEMAP_EXTENT_MERGED;
 290         bool past_eof = false, whole_file = false;
 291         int ret = 0;
 292
 293         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
 294         if (ret)
 295                 return ret;
 296
 297         /*
 298          * Either the i_mutex or other appropriate locking needs to be held
 299          * since we expect isize to not change at all through the duration of
 300          * this call.
 301          */
 302         if (len >= isize) {
 303                 whole_file = true;
 304                 len = isize;
 305         }
 306
 307         /*
 308          * Some filesystems can't deal with being asked to map less than
 309          * blocksize, so make sure our len is at least block length.
 310          */
 311         if (logical_to_blk(inode, len) == 0)
 312                 len = blk_to_logical(inode, 1);
 313
 314         start_blk = logical_to_blk(inode, start);
 315         last_blk = logical_to_blk(inode, start + len - 1);
 316
 317         do {
 318                 /*
 319                  * we set b_size to the total size we want so it will map as
 320                  * many contiguous blocks as possible at once
 321                  */
 322                 memset(&map_bh, 0, sizeof(struct buffer_head));
 323                 map_bh.b_size = len;
 324
 325                 ret = get_block(inode, start_blk, &map_bh, 0);
 326                 if (ret)
 327                         break;
 328
 329                 /* HOLE */
 330                 if (!buffer_mapped(&map_bh)) {
 331                         start_blk++;
 332
 333                         /*
 334                          * We want to handle the case where there is an
 335                          * allocated block at the front of the file, and then
 336                          * nothing but holes up to the end of the file properly,
 337                          * to make sure that extent at the front gets properly
 338                          * marked with FIEMAP_EXTENT_LAST
 339                          */
 340                         if (!past_eof &&
 341                             blk_to_logical(inode, start_blk) >= isize)
 342                                 past_eof = 1;
 343
 344                         /*
 345                          * First hole after going past the EOF, this is our
 346                          * last extent
 347                          */
 348                         if (past_eof && size) {
 349                                 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
 350                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 351                                                               phys, size,
 352                                                               flags);
 353                         } else if (size) {
 354                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 355                                                               phys, size, flags);
 356                                 size = 0;
 357                         }
 358
 359                         /* if we have holes up to/past EOF then we're done */
 360                         if (start_blk > last_blk || past_eof || ret)
 361                                 break;
 362                 } else {
 363                         /*
 364                          * We have gone over the length of what we wanted to
 365                          * map, and it wasn't the entire file, so add the extent
 366                          * we got last time and exit.
 367                          *
 368                          * This is for the case where say we want to map all the
 369                          * way up to the second to the last block in a file, but
 370                          * the last block is a hole, making the second to last
 371                          * block FIEMAP_EXTENT_LAST.  In this case we want to
 372                          * see if there is a hole after the second to last block
 373                          * so we can mark it properly.  If we found data after
 374                          * we exceeded the length we were requesting, then we
 375                          * are good to go, just add the extent to the fieinfo
 376                          * and break
 377                          */
 378                         if (start_blk > last_blk && !whole_file) {
 379                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 380                                                               phys, size,
 381                                                               flags);
 382                                 break;
 383                         }
 384
 385                         /*
 386                          * if size != 0 then we know we already have an extent
 387                          * to add, so add it.
 388                          */
 389                         if (size) {
 390                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 391                                                               phys, size,
 392                                                               flags);
 393                                 if (ret)
 394                                         break;
 395                         }
 396
 397                         logical = blk_to_logical(inode, start_blk);
 398                         phys = blk_to_logical(inode, map_bh.b_blocknr);
 399                         size = map_bh.b_size;
 400                         flags = FIEMAP_EXTENT_MERGED;
 401
 402                         start_blk += logical_to_blk(inode, size);
 403
 404                         /*
 405                          * If we are past the EOF, then we need to make sure as
 406                          * soon as we find a hole that the last extent we found
 407                          * is marked with FIEMAP_EXTENT_LAST
 408                          */
 409                         if (!past_eof && logical + size >= isize)
 410                                 past_eof = true;
 411                 }
 412                 cond_resched();
 413                 if (fatal_signal_pending(current)) {
 414                         ret = -EINTR;
 415                         break;
 416                 }
 417
 418         } while (1);
 419
 420         /* If ret is 1 then we just hit the end of the extent array */
 421         if (ret == 1)
 422                 ret = 0;
 423
 424         return ret;
 425 }
 426 EXPORT_SYMBOL(__generic_block_fiemap);
 427
 428 /**
 429  * generic_block_fiemap - FIEMAP for block based inodes
 430  * @inode: The inode to map
 431  * @fieinfo: The mapping information
 432  * @start: The initial block to map
 433  * @len: The length of the extect to attempt to map
 434  * @get_block: The block mapping function for the fs
 435  *
 436  * Calls __generic_block_fiemap to map the inode, after taking
 437  * the inode's mutex lock.
 438  */
 439
 440 int generic_block_fiemap(struct inode *inode,
 441                          struct fiemap_extent_info *fieinfo, u64 start,
 442                          u64 len, get_block_t *get_block)
 443 {
 444         int ret;
 445         inode_lock(inode);
 446         ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
 447         inode_unlock(inode);
 448         return ret;
 449 }
 450 EXPORT_SYMBOL(generic_block_fiemap);
 451
 452 #endif  /*  CONFIG_BLOCK  */
 453
 454 /*
 455  * This provides compatibility with legacy XFS pre-allocation ioctls
 456  * which predate the fallocate syscall.
 457  *
 458  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
 459  * are used here, rest are ignored.
 460  */
 461 int ioctl_preallocate(struct file *filp, void __user *argp)
 462 {
 463         struct inode *inode = file_inode(filp);
 464         struct space_resv sr;
 465
 466         if (copy_from_user(&sr, argp, sizeof(sr)))
 467                 return -EFAULT;
 468
 469         switch (sr.l_whence) {
 470         case SEEK_SET:
 471                 break;
 472         case SEEK_CUR:
 473                 sr.l_start += filp->f_pos;
 474                 break;
 475         case SEEK_END:
 476                 sr.l_start += i_size_read(inode);
 477                 break;
 478         default:
 479                 return -EINVAL;
 480         }
 481
 482         return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
 483 }
 484
 485 static int file_ioctl(struct file *filp, unsigned int cmd,
 486                 unsigned long arg)
 487 {
 488         struct inode *inode = file_inode(filp);
 489         int __user *p = (int __user *)arg;
 490
 491         switch (cmd) {
 492         case FIBMAP:
 493                 return ioctl_fibmap(filp, p);
 494         case FIONREAD:
 495                 return put_user(i_size_read(inode) - filp->f_pos, p);
 496         case FS_IOC_RESVSP:
 497         case FS_IOC_RESVSP64:
 498                 return ioctl_preallocate(filp, p);
 499         }
 500
 501         return vfs_ioctl(filp, cmd, arg);
 502 }
 503
 504 static int ioctl_fionbio(struct file *filp, int __user *argp)
 505 {
 506         unsigned int flag;
 507         int on, error;
 508
 509         error = get_user(on, argp);
 510         if (error)
 511                 return error;
 512         flag = O_NONBLOCK;
 513 #ifdef __sparc__
 514         /* SunOS compatibility item. */
 515         if (O_NONBLOCK != O_NDELAY)
 516                 flag |= O_NDELAY;
 517 #endif
 518         spin_lock(&filp->f_lock);
 519         if (on)
 520                 filp->f_flags |= flag;
 521         else
 522                 filp->f_flags &= ~flag;
 523         spin_unlock(&filp->f_lock);
 524         return error;
 525 }
 526
 527 static int ioctl_fioasync(unsigned int fd, struct file *filp,
 528                           int __user *argp)
 529 {
 530         unsigned int flag;
 531         int on, error;
 532
 533         error = get_user(on, argp);
 534         if (error)
 535                 return error;
 536         flag = on ? FASYNC : 0;
 537
 538         /* Did FASYNC state change ? */
 539         if ((flag ^ filp->f_flags) & FASYNC) {
 540                 if (filp->f_op->fasync)
 541                         /* fasync() adjusts filp->f_flags */
 542                         error = filp->f_op->fasync(fd, filp, on);
 543                 else
 544                         error = -ENOTTY;
 545         }
 546         return error < 0 ? error : 0;
 547 }
 548
 549 static int ioctl_fsfreeze(struct file *filp)
 550 {
 551         struct super_block *sb = file_inode(filp)->i_sb;
 552
 553         if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 554                 return -EPERM;
 555
 556         /* If filesystem doesn't support freeze feature, return. */
 557         if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
 558                 return -EOPNOTSUPP;
 559
 560         /* Freeze */
 561         if (sb->s_op->freeze_super)
 562                 return sb->s_op->freeze_super(sb);
 563         return freeze_super(sb);
 564 }
 565
 566 static int ioctl_fsthaw(struct file *filp)
 567 {
 568         struct super_block *sb = file_inode(filp)->i_sb;
 569
 570         if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 571                 return -EPERM;
 572
 573         /* Thaw */
 574         if (sb->s_op->thaw_super)
 575                 return sb->s_op->thaw_super(sb);
 576         return thaw_super(sb);
 577 }
 578
 579 static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
 580 {
 581         struct file_dedupe_range __user *argp = arg;
 582         struct file_dedupe_range *same = NULL;
 583         int ret;
 584         unsigned long size;
 585         u16 count;
 586
 587         if (get_user(count, &argp->dest_count)) {
 588                 ret = -EFAULT;
 589                 goto out;
 590         }
 591
 592         size = offsetof(struct file_dedupe_range __user, info[count]);
 593         if (size > PAGE_SIZE) {
 594                 ret = -ENOMEM;
 595                 goto out;
 596         }
 597
 598         same = memdup_user(argp, size);
 599         if (IS_ERR(same)) {
 600                 ret = PTR_ERR(same);
 601                 same = NULL;
 602                 goto out;
 603         }
 604
 605         same->dest_count = count;
 606         ret = vfs_dedupe_file_range(file, same);
 607         if (ret)
 608                 goto out;
 609
 610         ret = copy_to_user(argp, same, size);
 611         if (ret)
 612                 ret = -EFAULT;
 613
 614 out:
 615         kfree(same);
 616         return ret;
 617 }
 618
 619 /*
 620  * When you add any new common ioctls to the switches above and below
 621  * please update compat_sys_ioctl() too.
 622  *
 623  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 624  * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 625  */
 626 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 627              unsigned long arg)
 628 {
 629         int error = 0;
 630         int __user *argp = (int __user *)arg;
 631         struct inode *inode = file_inode(filp);
 632
 633         switch (cmd) {
 634         case FIOCLEX:
 635                 set_close_on_exec(fd, 1);
 636                 break;
 637
 638         case FIONCLEX:
 639                 set_close_on_exec(fd, 0);
 640                 break;
 641
 642         case FIONBIO:
 643                 error = ioctl_fionbio(filp, argp);
 644                 break;
 645
 646         case FIOASYNC:
 647                 error = ioctl_fioasync(fd, filp, argp);
 648                 break;
 649
 650         case FIOQSIZE:
 651                 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
 652                     S_ISLNK(inode->i_mode)) {
 653                         loff_t res = inode_get_bytes(inode);
 654                         error = copy_to_user(argp, &res, sizeof(res)) ?
 655                                         -EFAULT : 0;
 656                 } else
 657                         error = -ENOTTY;
 658                 break;
 659
 660         case FIFREEZE:
 661                 error = ioctl_fsfreeze(filp);
 662                 break;
 663
 664         case FITHAW:
 665                 error = ioctl_fsthaw(filp);
 666                 break;
 667
 668         case FS_IOC_FIEMAP:
 669                 return ioctl_fiemap(filp, arg);
 670
 671         case FIGETBSZ:
 672                 /* anon_bdev filesystems may not have a block size */
 673                 if (!inode->i_sb->s_blocksize)
 674                         return -EINVAL;
 675                 return put_user(inode->i_sb->s_blocksize, argp);
 676
 677         case FICLONE:
 678                 return ioctl_file_clone(filp, arg, 0, 0, 0);
 679
 680         case FICLONERANGE:
 681                 return ioctl_file_clone_range(filp, argp);
 682
 683         case FIDEDUPERANGE:
 684                 return ioctl_file_dedupe_range(filp, argp);
 685
 686         default:
 687                 if (S_ISREG(inode->i_mode))
 688                         error = file_ioctl(filp, cmd, arg);
 689                 else
 690                         error = vfs_ioctl(filp, cmd, arg);
 691                 break;
 692         }
 693         return error;
 694 }
 695
 696 int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 697 {
 698         int error;
 699         struct fd f = fdget(fd);
 700
 701         if (!f.file)
 702                 return -EBADF;
 703         error = security_file_ioctl(f.file, cmd, arg);
 704         if (!error)
 705                 error = do_vfs_ioctl(f.file, fd, cmd, arg);
 706         fdput(f);
 707         return error;
 708 }
 709
 710 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
 711 {
 712         return ksys_ioctl(fd, cmd, arg);
 713 }