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(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         loff_t cloned;
 227         int ret;
 228
 229         if (!src_file.file)
 230                 return -EBADF;
 231         ret = -EXDEV;
 232         if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
 233                 goto fdput;
 234         cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
 235                                       olen, 0);
 236         if (cloned < 0)
 237                 ret = cloned;
 238         else if (olen && cloned != olen)
 239                 ret = -EINVAL;
 240         else
 241                 ret = 0;
 242 fdput:
 243         fdput(src_file);
 244         return ret;
 245 }
 246
 247 static long ioctl_file_clone_range(struct file *file, void __user *argp)
 248 {
 249         struct file_clone_range args;
 250
 251         if (copy_from_user(&args, argp, sizeof(args)))
 252                 return -EFAULT;
 253         return ioctl_file_clone(file, args.src_fd, args.src_offset,
 254                                 args.src_length, args.dest_offset);
 255 }
 256
 257 #ifdef CONFIG_BLOCK
 258
 259 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
 260 {
 261         return (offset >> inode->i_blkbits);
 262 }
 263
 264 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
 265 {
 266         return (blk << inode->i_blkbits);
 267 }
 268
 269 /**
 270  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
 271  * @inode: the inode to map
 272  * @fieinfo: the fiemap info struct that will be passed back to userspace
 273  * @start: where to start mapping in the inode
 274  * @len: how much space to map
 275  * @get_block: the fs's get_block function
 276  *
 277  * This does FIEMAP for block based inodes.  Basically it will just loop
 278  * through get_block until we hit the number of extents we want to map, or we
 279  * go past the end of the file and hit a hole.
 280  *
 281  * If it is possible to have data blocks beyond a hole past @inode->i_size, then
 282  * please do not use this function, it will stop at the first unmapped block
 283  * beyond i_size.
 284  *
 285  * If you use this function directly, you need to do your own locking. Use
 286  * generic_block_fiemap if you want the locking done for you.
 287  */
 288
 289 int __generic_block_fiemap(struct inode *inode,
 290                            struct fiemap_extent_info *fieinfo, loff_t start,
 291                            loff_t len, get_block_t *get_block)
 292 {
 293         struct buffer_head map_bh;
 294         sector_t start_blk, last_blk;
 295         loff_t isize = i_size_read(inode);
 296         u64 logical = 0, phys = 0, size = 0;
 297         u32 flags = FIEMAP_EXTENT_MERGED;
 298         bool past_eof = false, whole_file = false;
 299         int ret = 0;
 300
 301         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
 302         if (ret)
 303                 return ret;
 304
 305         /*
 306          * Either the i_mutex or other appropriate locking needs to be held
 307          * since we expect isize to not change at all through the duration of
 308          * this call.
 309          */
 310         if (len >= isize) {
 311                 whole_file = true;
 312                 len = isize;
 313         }
 314
 315         /*
 316          * Some filesystems can't deal with being asked to map less than
 317          * blocksize, so make sure our len is at least block length.
 318          */
 319         if (logical_to_blk(inode, len) == 0)
 320                 len = blk_to_logical(inode, 1);
 321
 322         start_blk = logical_to_blk(inode, start);
 323         last_blk = logical_to_blk(inode, start + len - 1);
 324
 325         do {
 326                 /*
 327                  * we set b_size to the total size we want so it will map as
 328                  * many contiguous blocks as possible at once
 329                  */
 330                 memset(&map_bh, 0, sizeof(struct buffer_head));
 331                 map_bh.b_size = len;
 332
 333                 ret = get_block(inode, start_blk, &map_bh, 0);
 334                 if (ret)
 335                         break;
 336
 337                 /* HOLE */
 338                 if (!buffer_mapped(&map_bh)) {
 339                         start_blk++;
 340
 341                         /*
 342                          * We want to handle the case where there is an
 343                          * allocated block at the front of the file, and then
 344                          * nothing but holes up to the end of the file properly,
 345                          * to make sure that extent at the front gets properly
 346                          * marked with FIEMAP_EXTENT_LAST
 347                          */
 348                         if (!past_eof &&
 349                             blk_to_logical(inode, start_blk) >= isize)
 350                                 past_eof = 1;
 351
 352                         /*
 353                          * First hole after going past the EOF, this is our
 354                          * last extent
 355                          */
 356                         if (past_eof && size) {
 357                                 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
 358                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 359                                                               phys, size,
 360                                                               flags);
 361                         } else if (size) {
 362                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 363                                                               phys, size, flags);
 364                                 size = 0;
 365                         }
 366
 367                         /* if we have holes up to/past EOF then we're done */
 368                         if (start_blk > last_blk || past_eof || ret)
 369                                 break;
 370                 } else {
 371                         /*
 372                          * We have gone over the length of what we wanted to
 373                          * map, and it wasn't the entire file, so add the extent
 374                          * we got last time and exit.
 375                          *
 376                          * This is for the case where say we want to map all the
 377                          * way up to the second to the last block in a file, but
 378                          * the last block is a hole, making the second to last
 379                          * block FIEMAP_EXTENT_LAST.  In this case we want to
 380                          * see if there is a hole after the second to last block
 381                          * so we can mark it properly.  If we found data after
 382                          * we exceeded the length we were requesting, then we
 383                          * are good to go, just add the extent to the fieinfo
 384                          * and break
 385                          */
 386                         if (start_blk > last_blk && !whole_file) {
 387                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 388                                                               phys, size,
 389                                                               flags);
 390                                 break;
 391                         }
 392
 393                         /*
 394                          * if size != 0 then we know we already have an extent
 395                          * to add, so add it.
 396                          */
 397                         if (size) {
 398                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 399                                                               phys, size,
 400                                                               flags);
 401                                 if (ret)
 402                                         break;
 403                         }
 404
 405                         logical = blk_to_logical(inode, start_blk);
 406                         phys = blk_to_logical(inode, map_bh.b_blocknr);
 407                         size = map_bh.b_size;
 408                         flags = FIEMAP_EXTENT_MERGED;
 409
 410                         start_blk += logical_to_blk(inode, size);
 411
 412                         /*
 413                          * If we are past the EOF, then we need to make sure as
 414                          * soon as we find a hole that the last extent we found
 415                          * is marked with FIEMAP_EXTENT_LAST
 416                          */
 417                         if (!past_eof && logical + size >= isize)
 418                                 past_eof = true;
 419                 }
 420                 cond_resched();
 421                 if (fatal_signal_pending(current)) {
 422                         ret = -EINTR;
 423                         break;
 424                 }
 425
 426         } while (1);
 427
 428         /* If ret is 1 then we just hit the end of the extent array */
 429         if (ret == 1)
 430                 ret = 0;
 431
 432         return ret;
 433 }
 434 EXPORT_SYMBOL(__generic_block_fiemap);
 435
 436 /**
 437  * generic_block_fiemap - FIEMAP for block based inodes
 438  * @inode: The inode to map
 439  * @fieinfo: The mapping information
 440  * @start: The initial block to map
 441  * @len: The length of the extect to attempt to map
 442  * @get_block: The block mapping function for the fs
 443  *
 444  * Calls __generic_block_fiemap to map the inode, after taking
 445  * the inode's mutex lock.
 446  */
 447
 448 int generic_block_fiemap(struct inode *inode,
 449                          struct fiemap_extent_info *fieinfo, u64 start,
 450                          u64 len, get_block_t *get_block)
 451 {
 452         int ret;
 453         inode_lock(inode);
 454         ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
 455         inode_unlock(inode);
 456         return ret;
 457 }
 458 EXPORT_SYMBOL(generic_block_fiemap);
 459
 460 #endif  /*  CONFIG_BLOCK  */
 461
 462 /*
 463  * This provides compatibility with legacy XFS pre-allocation ioctls
 464  * which predate the fallocate syscall.
 465  *
 466  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
 467  * are used here, rest are ignored.
 468  */
 469 int ioctl_preallocate(struct file *filp, void __user *argp)
 470 {
 471         struct inode *inode = file_inode(filp);
 472         struct space_resv sr;
 473
 474         if (copy_from_user(&sr, argp, sizeof(sr)))
 475                 return -EFAULT;
 476
 477         switch (sr.l_whence) {
 478         case SEEK_SET:
 479                 break;
 480         case SEEK_CUR:
 481                 sr.l_start += filp->f_pos;
 482                 break;
 483         case SEEK_END:
 484                 sr.l_start += i_size_read(inode);
 485                 break;
 486         default:
 487                 return -EINVAL;
 488         }
 489
 490         return vfs_fallocate(filp, FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
 491 }
 492
 493 static int file_ioctl(struct file *filp, unsigned int cmd,
 494                 unsigned long arg)
 495 {
 496         struct inode *inode = file_inode(filp);
 497         int __user *p = (int __user *)arg;
 498
 499         switch (cmd) {
 500         case FIBMAP:
 501                 return ioctl_fibmap(filp, p);
 502         case FIONREAD:
 503                 return put_user(i_size_read(inode) - filp->f_pos, p);
 504         case FS_IOC_RESVSP:
 505         case FS_IOC_RESVSP64:
 506                 return ioctl_preallocate(filp, p);
 507         }
 508
 509         return vfs_ioctl(filp, cmd, arg);
 510 }
 511
 512 static int ioctl_fionbio(struct file *filp, int __user *argp)
 513 {
 514         unsigned int flag;
 515         int on, error;
 516
 517         error = get_user(on, argp);
 518         if (error)
 519                 return error;
 520         flag = O_NONBLOCK;
 521 #ifdef __sparc__
 522         /* SunOS compatibility item. */
 523         if (O_NONBLOCK != O_NDELAY)
 524                 flag |= O_NDELAY;
 525 #endif
 526         spin_lock(&filp->f_lock);
 527         if (on)
 528                 filp->f_flags |= flag;
 529         else
 530                 filp->f_flags &= ~flag;
 531         spin_unlock(&filp->f_lock);
 532         return error;
 533 }
 534
 535 static int ioctl_fioasync(unsigned int fd, struct file *filp,
 536                           int __user *argp)
 537 {
 538         unsigned int flag;
 539         int on, error;
 540
 541         error = get_user(on, argp);
 542         if (error)
 543                 return error;
 544         flag = on ? FASYNC : 0;
 545
 546         /* Did FASYNC state change ? */
 547         if ((flag ^ filp->f_flags) & FASYNC) {
 548                 if (filp->f_op->fasync)
 549                         /* fasync() adjusts filp->f_flags */
 550                         error = filp->f_op->fasync(fd, filp, on);
 551                 else
 552                         error = -ENOTTY;
 553         }
 554         return error < 0 ? error : 0;
 555 }
 556
 557 static int ioctl_fsfreeze(struct file *filp)
 558 {
 559         struct super_block *sb = file_inode(filp)->i_sb;
 560
 561         if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 562                 return -EPERM;
 563
 564         /* If filesystem doesn't support freeze feature, return. */
 565         if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
 566                 return -EOPNOTSUPP;
 567
 568         /* Freeze */
 569         if (sb->s_op->freeze_super)
 570                 return sb->s_op->freeze_super(sb);
 571         return freeze_super(sb);
 572 }
 573
 574 static int ioctl_fsthaw(struct file *filp)
 575 {
 576         struct super_block *sb = file_inode(filp)->i_sb;
 577
 578         if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 579                 return -EPERM;
 580
 581         /* Thaw */
 582         if (sb->s_op->thaw_super)
 583                 return sb->s_op->thaw_super(sb);
 584         return thaw_super(sb);
 585 }
 586
 587 static int ioctl_file_dedupe_range(struct file *file, void __user *arg)
 588 {
 589         struct file_dedupe_range __user *argp = arg;
 590         struct file_dedupe_range *same = NULL;
 591         int ret;
 592         unsigned long size;
 593         u16 count;
 594
 595         if (get_user(count, &argp->dest_count)) {
 596                 ret = -EFAULT;
 597                 goto out;
 598         }
 599
 600         size = offsetof(struct file_dedupe_range __user, info[count]);
 601         if (size > PAGE_SIZE) {
 602                 ret = -ENOMEM;
 603                 goto out;
 604         }
 605
 606         same = memdup_user(argp, size);
 607         if (IS_ERR(same)) {
 608                 ret = PTR_ERR(same);
 609                 same = NULL;
 610                 goto out;
 611         }
 612
 613         same->dest_count = count;
 614         ret = vfs_dedupe_file_range(file, same);
 615         if (ret)
 616                 goto out;
 617
 618         ret = copy_to_user(argp, same, size);
 619         if (ret)
 620                 ret = -EFAULT;
 621
 622 out:
 623         kfree(same);
 624         return ret;
 625 }
 626
 627 /*
 628  * When you add any new common ioctls to the switches above and below
 629  * please update compat_sys_ioctl() too.
 630  *
 631  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 632  * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 633  */
 634 int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 635              unsigned long arg)
 636 {
 637         int error = 0;
 638         int __user *argp = (int __user *)arg;
 639         struct inode *inode = file_inode(filp);
 640
 641         switch (cmd) {
 642         case FIOCLEX:
 643                 set_close_on_exec(fd, 1);
 644                 break;
 645
 646         case FIONCLEX:
 647                 set_close_on_exec(fd, 0);
 648                 break;
 649
 650         case FIONBIO:
 651                 error = ioctl_fionbio(filp, argp);
 652                 break;
 653
 654         case FIOASYNC:
 655                 error = ioctl_fioasync(fd, filp, argp);
 656                 break;
 657
 658         case FIOQSIZE:
 659                 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
 660                     S_ISLNK(inode->i_mode)) {
 661                         loff_t res = inode_get_bytes(inode);
 662                         error = copy_to_user(argp, &res, sizeof(res)) ?
 663                                         -EFAULT : 0;
 664                 } else
 665                         error = -ENOTTY;
 666                 break;
 667
 668         case FIFREEZE:
 669                 error = ioctl_fsfreeze(filp);
 670                 break;
 671
 672         case FITHAW:
 673                 error = ioctl_fsthaw(filp);
 674                 break;
 675
 676         case FS_IOC_FIEMAP:
 677                 return ioctl_fiemap(filp, arg);
 678
 679         case FIGETBSZ:
 680                 /* anon_bdev filesystems may not have a block size */
 681                 if (!inode->i_sb->s_blocksize)
 682                         return -EINVAL;
 683                 return put_user(inode->i_sb->s_blocksize, argp);
 684
 685         case FICLONE:
 686                 return ioctl_file_clone(filp, arg, 0, 0, 0);
 687
 688         case FICLONERANGE:
 689                 return ioctl_file_clone_range(filp, argp);
 690
 691         case FIDEDUPERANGE:
 692                 return ioctl_file_dedupe_range(filp, argp);
 693
 694         default:
 695                 if (S_ISREG(inode->i_mode))
 696                         error = file_ioctl(filp, cmd, arg);
 697                 else
 698                         error = vfs_ioctl(filp, cmd, arg);
 699                 break;
 700         }
 701         return error;
 702 }
 703
 704 int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 705 {
 706         int error;
 707         struct fd f = fdget(fd);
 708
 709         if (!f.file)
 710                 return -EBADF;
 711         error = security_file_ioctl(f.file, cmd, arg);
 712         if (!error)
 713                 error = do_vfs_ioctl(f.file, fd, cmd, arg);
 714         fdput(f);
 715         return error;
 716 }
 717
 718 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
 719 {
 720         return ksys_ioctl(fd, cmd, arg);
 721 }