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/compat.h>
  12 #include <linux/file.h>
  13 #include <linux/fs.h>
  14 #include <linux/security.h>
  15 #include <linux/export.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/writeback.h>
  18 #include <linux/buffer_head.h>
  19 #include <linux/falloc.h>
  20 #include <linux/sched/signal.h>
  21 #include <linux/fiemap.h>
  22
  23 #include "internal.h"
  24
  25 #include <asm/ioctls.h>
  26
  27 /* So that the fiemap access checks can't overflow on 32 bit machines. */
  28 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
  29
  30 /**
  31  * vfs_ioctl - call filesystem specific ioctl methods
  32  * @filp:       open file to invoke ioctl method on
  33  * @cmd:        ioctl command to execute
  34  * @arg:        command-specific argument for ioctl
  35  *
  36  * Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
  37  * returns -ENOTTY.
  38  *
  39  * Returns 0 on success, -errno on error.
  40  */
  41 long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
  42 {
  43         int error = -ENOTTY;
  44
  45         if (!filp->f_op->unlocked_ioctl)
  46                 goto out;
  47
  48         error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
  49         if (error == -ENOIOCTLCMD)
  50                 error = -ENOTTY;
  51  out:
  52         return error;
  53 }
  54 EXPORT_SYMBOL(vfs_ioctl);
  55
  56 static int ioctl_fibmap(struct file *filp, int __user *p)
  57 {
  58         struct inode *inode = file_inode(filp);
  59         struct super_block *sb = inode->i_sb;
  60         int error, ur_block;
  61         sector_t block;
  62
  63         if (!capable(CAP_SYS_RAWIO))
  64                 return -EPERM;
  65
  66         error = get_user(ur_block, p);
  67         if (error)
  68                 return error;
  69
  70         if (ur_block < 0)
  71                 return -EINVAL;
  72
  73         block = ur_block;
  74         error = bmap(inode, &block);
  75
  76         if (block > INT_MAX) {
  77                 error = -ERANGE;
  78                 pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n",
  79                                     current->comm, task_pid_nr(current),
  80                                     sb->s_id, filp);
  81         }
  82
  83         if (error)
  84                 ur_block = 0;
  85         else
  86                 ur_block = block;
  87
  88         if (put_user(ur_block, p))
  89                 error = -EFAULT;
  90
  91         return error;
  92 }
  93
  94 /**
  95  * fiemap_fill_next_extent - Fiemap helper function
  96  * @fieinfo:    Fiemap context passed into ->fiemap
  97  * @logical:    Extent logical start offset, in bytes
  98  * @phys:       Extent physical start offset, in bytes
  99  * @len:        Extent length, in bytes
 100  * @flags:      FIEMAP_EXTENT flags that describe this extent
 101  *
 102  * Called from file system ->fiemap callback. Will populate extent
 103  * info as passed in via arguments and copy to user memory. On
 104  * success, extent count on fieinfo is incremented.
 105  *
 106  * Returns 0 on success, -errno on error, 1 if this was the last
 107  * extent that will fit in user array.
 108  */
 109 #define SET_UNKNOWN_FLAGS       (FIEMAP_EXTENT_DELALLOC)
 110 #define SET_NO_UNMOUNTED_IO_FLAGS       (FIEMAP_EXTENT_DATA_ENCRYPTED)
 111 #define SET_NOT_ALIGNED_FLAGS   (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
 112 int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
 113                             u64 phys, u64 len, u32 flags)
 114 {
 115         struct fiemap_extent extent;
 116         struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
 117
 118         /* only count the extents */
 119         if (fieinfo->fi_extents_max == 0) {
 120                 fieinfo->fi_extents_mapped++;
 121                 return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
 122         }
 123
 124         if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
 125                 return 1;
 126
 127         if (flags & SET_UNKNOWN_FLAGS)
 128                 flags |= FIEMAP_EXTENT_UNKNOWN;
 129         if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
 130                 flags |= FIEMAP_EXTENT_ENCODED;
 131         if (flags & SET_NOT_ALIGNED_FLAGS)
 132                 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
 133
 134         memset(&extent, 0, sizeof(extent));
 135         extent.fe_logical = logical;
 136         extent.fe_physical = phys;
 137         extent.fe_length = len;
 138         extent.fe_flags = flags;
 139
 140         dest += fieinfo->fi_extents_mapped;
 141         if (copy_to_user(dest, &extent, sizeof(extent)))
 142                 return -EFAULT;
 143
 144         fieinfo->fi_extents_mapped++;
 145         if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
 146                 return 1;
 147         return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
 148 }
 149 EXPORT_SYMBOL(fiemap_fill_next_extent);
 150
 151 /**
 152  * fiemap_prep - check validity of requested flags for fiemap
 153  * @inode:      Inode to operate on
 154  * @fieinfo:    Fiemap context passed into ->fiemap
 155  * @start:      Start of the mapped range
 156  * @len:        Length of the mapped range, can be truncated by this function.
 157  * @supported_flags:    Set of fiemap flags that the file system understands
 158  *
 159  * This function must be called from each ->fiemap instance to validate the
 160  * fiemap request against the file system parameters.
 161  *
 162  * Returns 0 on success, or a negative error on failure.
 163  */
 164 int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
 165                 u64 start, u64 *len, u32 supported_flags)
 166 {
 167         u64 maxbytes = inode->i_sb->s_maxbytes;
 168         u32 incompat_flags;
 169         int ret = 0;
 170
 171         if (*len == 0)
 172                 return -EINVAL;
 173         if (start > maxbytes)
 174                 return -EFBIG;
 175
 176         /*
 177          * Shrink request scope to what the fs can actually handle.
 178          */
 179         if (*len > maxbytes || (maxbytes - *len) < start)
 180                 *len = maxbytes - start;
 181
 182         supported_flags |= FIEMAP_FLAG_SYNC;
 183         supported_flags &= FIEMAP_FLAGS_COMPAT;
 184         incompat_flags = fieinfo->fi_flags & ~supported_flags;
 185         if (incompat_flags) {
 186                 fieinfo->fi_flags = incompat_flags;
 187                 return -EBADR;
 188         }
 189
 190         if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
 191                 ret = filemap_write_and_wait(inode->i_mapping);
 192         return ret;
 193 }
 194 EXPORT_SYMBOL(fiemap_prep);
 195
 196 static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
 197 {
 198         struct fiemap fiemap;
 199         struct fiemap_extent_info fieinfo = { 0, };
 200         struct inode *inode = file_inode(filp);
 201         int error;
 202
 203         if (!inode->i_op->fiemap)
 204                 return -EOPNOTSUPP;
 205
 206         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 207                 return -EFAULT;
 208
 209         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 210                 return -EINVAL;
 211
 212         fieinfo.fi_flags = fiemap.fm_flags;
 213         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 214         fieinfo.fi_extents_start = ufiemap->fm_extents;
 215
 216         error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
 217                         fiemap.fm_length);
 218
 219         fiemap.fm_flags = fieinfo.fi_flags;
 220         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 221         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 222                 error = -EFAULT;
 223
 224         return error;
 225 }
 226
 227 static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
 228                              u64 off, u64 olen, u64 destoff)
 229 {
 230         struct fd src_file = fdget(srcfd);
 231         loff_t cloned;
 232         int ret;
 233
 234         if (!src_file.file)
 235                 return -EBADF;
 236         ret = -EXDEV;
 237         if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
 238                 goto fdput;
 239         cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
 240                                       olen, 0);
 241         if (cloned < 0)
 242                 ret = cloned;
 243         else if (olen && cloned != olen)
 244                 ret = -EINVAL;
 245         else
 246                 ret = 0;
 247 fdput:
 248         fdput(src_file);
 249         return ret;
 250 }
 251
 252 static long ioctl_file_clone_range(struct file *file,
 253                                    struct file_clone_range __user *argp)
 254 {
 255         struct file_clone_range args;
 256
 257         if (copy_from_user(&args, argp, sizeof(args)))
 258                 return -EFAULT;
 259         return ioctl_file_clone(file, args.src_fd, args.src_offset,
 260                                 args.src_length, args.dest_offset);
 261 }
 262
 263 #ifdef CONFIG_BLOCK
 264
 265 static inline sector_t logical_to_blk(struct inode *inode, loff_t offset)
 266 {
 267         return (offset >> inode->i_blkbits);
 268 }
 269
 270 static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
 271 {
 272         return (blk << inode->i_blkbits);
 273 }
 274
 275 /**
 276  * __generic_block_fiemap - FIEMAP for block based inodes (no locking)
 277  * @inode: the inode to map
 278  * @fieinfo: the fiemap info struct that will be passed back to userspace
 279  * @start: where to start mapping in the inode
 280  * @len: how much space to map
 281  * @get_block: the fs's get_block function
 282  *
 283  * This does FIEMAP for block based inodes.  Basically it will just loop
 284  * through get_block until we hit the number of extents we want to map, or we
 285  * go past the end of the file and hit a hole.
 286  *
 287  * If it is possible to have data blocks beyond a hole past @inode->i_size, then
 288  * please do not use this function, it will stop at the first unmapped block
 289  * beyond i_size.
 290  *
 291  * If you use this function directly, you need to do your own locking. Use
 292  * generic_block_fiemap if you want the locking done for you.
 293  */
 294 static int __generic_block_fiemap(struct inode *inode,
 295                            struct fiemap_extent_info *fieinfo, loff_t start,
 296                            loff_t len, get_block_t *get_block)
 297 {
 298         struct buffer_head map_bh;
 299         sector_t start_blk, last_blk;
 300         loff_t isize = i_size_read(inode);
 301         u64 logical = 0, phys = 0, size = 0;
 302         u32 flags = FIEMAP_EXTENT_MERGED;
 303         bool past_eof = false, whole_file = false;
 304         int ret = 0;
 305
 306         ret = fiemap_prep(inode, fieinfo, start, &len, FIEMAP_FLAG_SYNC);
 307         if (ret)
 308                 return ret;
 309
 310         /*
 311          * Either the i_mutex or other appropriate locking needs to be held
 312          * since we expect isize to not change at all through the duration of
 313          * this call.
 314          */
 315         if (len >= isize) {
 316                 whole_file = true;
 317                 len = isize;
 318         }
 319
 320         /*
 321          * Some filesystems can't deal with being asked to map less than
 322          * blocksize, so make sure our len is at least block length.
 323          */
 324         if (logical_to_blk(inode, len) == 0)
 325                 len = blk_to_logical(inode, 1);
 326
 327         start_blk = logical_to_blk(inode, start);
 328         last_blk = logical_to_blk(inode, start + len - 1);
 329
 330         do {
 331                 /*
 332                  * we set b_size to the total size we want so it will map as
 333                  * many contiguous blocks as possible at once
 334                  */
 335                 memset(&map_bh, 0, sizeof(struct buffer_head));
 336                 map_bh.b_size = len;
 337
 338                 ret = get_block(inode, start_blk, &map_bh, 0);
 339                 if (ret)
 340                         break;
 341
 342                 /* HOLE */
 343                 if (!buffer_mapped(&map_bh)) {
 344                         start_blk++;
 345
 346                         /*
 347                          * We want to handle the case where there is an
 348                          * allocated block at the front of the file, and then
 349                          * nothing but holes up to the end of the file properly,
 350                          * to make sure that extent at the front gets properly
 351                          * marked with FIEMAP_EXTENT_LAST
 352                          */
 353                         if (!past_eof &&
 354                             blk_to_logical(inode, start_blk) >= isize)
 355                                 past_eof = 1;
 356
 357                         /*
 358                          * First hole after going past the EOF, this is our
 359                          * last extent
 360                          */
 361                         if (past_eof && size) {
 362                                 flags = FIEMAP_EXTENT_MERGED|FIEMAP_EXTENT_LAST;
 363                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 364                                                               phys, size,
 365                                                               flags);
 366                         } else if (size) {
 367                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 368                                                               phys, size, flags);
 369                                 size = 0;
 370                         }
 371
 372                         /* if we have holes up to/past EOF then we're done */
 373                         if (start_blk > last_blk || past_eof || ret)
 374                                 break;
 375                 } else {
 376                         /*
 377                          * We have gone over the length of what we wanted to
 378                          * map, and it wasn't the entire file, so add the extent
 379                          * we got last time and exit.
 380                          *
 381                          * This is for the case where say we want to map all the
 382                          * way up to the second to the last block in a file, but
 383                          * the last block is a hole, making the second to last
 384                          * block FIEMAP_EXTENT_LAST.  In this case we want to
 385                          * see if there is a hole after the second to last block
 386                          * so we can mark it properly.  If we found data after
 387                          * we exceeded the length we were requesting, then we
 388                          * are good to go, just add the extent to the fieinfo
 389                          * and break
 390                          */
 391                         if (start_blk > last_blk && !whole_file) {
 392                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 393                                                               phys, size,
 394                                                               flags);
 395                                 break;
 396                         }
 397
 398                         /*
 399                          * if size != 0 then we know we already have an extent
 400                          * to add, so add it.
 401                          */
 402                         if (size) {
 403                                 ret = fiemap_fill_next_extent(fieinfo, logical,
 404                                                               phys, size,
 405                                                               flags);
 406                                 if (ret)
 407                                         break;
 408                         }
 409
 410                         logical = blk_to_logical(inode, start_blk);
 411                         phys = blk_to_logical(inode, map_bh.b_blocknr);
 412                         size = map_bh.b_size;
 413                         flags = FIEMAP_EXTENT_MERGED;
 414
 415                         start_blk += logical_to_blk(inode, size);
 416
 417                         /*
 418                          * If we are past the EOF, then we need to make sure as
 419                          * soon as we find a hole that the last extent we found
 420                          * is marked with FIEMAP_EXTENT_LAST
 421                          */
 422                         if (!past_eof && logical + size >= isize)
 423                                 past_eof = true;
 424                 }
 425                 cond_resched();
 426                 if (fatal_signal_pending(current)) {
 427                         ret = -EINTR;
 428                         break;
 429                 }
 430
 431         } while (1);
 432
 433         /* If ret is 1 then we just hit the end of the extent array */
 434         if (ret == 1)
 435                 ret = 0;
 436
 437         return ret;
 438 }
 439
 440 /**
 441  * generic_block_fiemap - FIEMAP for block based inodes
 442  * @inode: The inode to map
 443  * @fieinfo: The mapping information
 444  * @start: The initial block to map
 445  * @len: The length of the extect to attempt to map
 446  * @get_block: The block mapping function for the fs
 447  *
 448  * Calls __generic_block_fiemap to map the inode, after taking
 449  * the inode's mutex lock.
 450  */
 451
 452 int generic_block_fiemap(struct inode *inode,
 453                          struct fiemap_extent_info *fieinfo, u64 start,
 454                          u64 len, get_block_t *get_block)
 455 {
 456         int ret;
 457         inode_lock(inode);
 458         ret = __generic_block_fiemap(inode, fieinfo, start, len, get_block);
 459         inode_unlock(inode);
 460         return ret;
 461 }
 462 EXPORT_SYMBOL(generic_block_fiemap);
 463
 464 #endif  /*  CONFIG_BLOCK  */
 465
 466 /*
 467  * This provides compatibility with legacy XFS pre-allocation ioctls
 468  * which predate the fallocate syscall.
 469  *
 470  * Only the l_start, l_len and l_whence fields of the 'struct space_resv'
 471  * are used here, rest are ignored.
 472  */
 473 static int ioctl_preallocate(struct file *filp, int mode, void __user *argp)
 474 {
 475         struct inode *inode = file_inode(filp);
 476         struct space_resv sr;
 477
 478         if (copy_from_user(&sr, argp, sizeof(sr)))
 479                 return -EFAULT;
 480
 481         switch (sr.l_whence) {
 482         case SEEK_SET:
 483                 break;
 484         case SEEK_CUR:
 485                 sr.l_start += filp->f_pos;
 486                 break;
 487         case SEEK_END:
 488                 sr.l_start += i_size_read(inode);
 489                 break;
 490         default:
 491                 return -EINVAL;
 492         }
 493
 494         return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start,
 495                         sr.l_len);
 496 }
 497
 498 /* on ia32 l_start is on a 32-bit boundary */
 499 #if defined CONFIG_COMPAT && defined(CONFIG_X86_64)
 500 /* just account for different alignment */
 501 static int compat_ioctl_preallocate(struct file *file, int mode,
 502                                     struct space_resv_32 __user *argp)
 503 {
 504         struct inode *inode = file_inode(file);
 505         struct space_resv_32 sr;
 506
 507         if (copy_from_user(&sr, argp, sizeof(sr)))
 508                 return -EFAULT;
 509
 510         switch (sr.l_whence) {
 511         case SEEK_SET:
 512                 break;
 513         case SEEK_CUR:
 514                 sr.l_start += file->f_pos;
 515                 break;
 516         case SEEK_END:
 517                 sr.l_start += i_size_read(inode);
 518                 break;
 519         default:
 520                 return -EINVAL;
 521         }
 522
 523         return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
 524 }
 525 #endif
 526
 527 static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p)
 528 {
 529         switch (cmd) {
 530         case FIBMAP:
 531                 return ioctl_fibmap(filp, p);
 532         case FS_IOC_RESVSP:
 533         case FS_IOC_RESVSP64:
 534                 return ioctl_preallocate(filp, 0, p);
 535         case FS_IOC_UNRESVSP:
 536         case FS_IOC_UNRESVSP64:
 537                 return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p);
 538         case FS_IOC_ZERO_RANGE:
 539                 return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p);
 540         }
 541
 542         return -ENOIOCTLCMD;
 543 }
 544
 545 static int ioctl_fionbio(struct file *filp, int __user *argp)
 546 {
 547         unsigned int flag;
 548         int on, error;
 549
 550         error = get_user(on, argp);
 551         if (error)
 552                 return error;
 553         flag = O_NONBLOCK;
 554 #ifdef __sparc__
 555         /* SunOS compatibility item. */
 556         if (O_NONBLOCK != O_NDELAY)
 557                 flag |= O_NDELAY;
 558 #endif
 559         spin_lock(&filp->f_lock);
 560         if (on)
 561                 filp->f_flags |= flag;
 562         else
 563                 filp->f_flags &= ~flag;
 564         spin_unlock(&filp->f_lock);
 565         return error;
 566 }
 567
 568 static int ioctl_fioasync(unsigned int fd, struct file *filp,
 569                           int __user *argp)
 570 {
 571         unsigned int flag;
 572         int on, error;
 573
 574         error = get_user(on, argp);
 575         if (error)
 576                 return error;
 577         flag = on ? FASYNC : 0;
 578
 579         /* Did FASYNC state change ? */
 580         if ((flag ^ filp->f_flags) & FASYNC) {
 581                 if (filp->f_op->fasync)
 582                         /* fasync() adjusts filp->f_flags */
 583                         error = filp->f_op->fasync(fd, filp, on);
 584                 else
 585                         error = -ENOTTY;
 586         }
 587         return error < 0 ? error : 0;
 588 }
 589
 590 static int ioctl_fsfreeze(struct file *filp)
 591 {
 592         struct super_block *sb = file_inode(filp)->i_sb;
 593
 594         if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 595                 return -EPERM;
 596
 597         /* If filesystem doesn't support freeze feature, return. */
 598         if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
 599                 return -EOPNOTSUPP;
 600
 601         /* Freeze */
 602         if (sb->s_op->freeze_super)
 603                 return sb->s_op->freeze_super(sb);
 604         return freeze_super(sb);
 605 }
 606
 607 static int ioctl_fsthaw(struct file *filp)
 608 {
 609         struct super_block *sb = file_inode(filp)->i_sb;
 610
 611         if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 612                 return -EPERM;
 613
 614         /* Thaw */
 615         if (sb->s_op->thaw_super)
 616                 return sb->s_op->thaw_super(sb);
 617         return thaw_super(sb);
 618 }
 619
 620 static int ioctl_file_dedupe_range(struct file *file,
 621                                    struct file_dedupe_range __user *argp)
 622 {
 623         struct file_dedupe_range *same = NULL;
 624         int ret;
 625         unsigned long size;
 626         u16 count;
 627
 628         if (get_user(count, &argp->dest_count)) {
 629                 ret = -EFAULT;
 630                 goto out;
 631         }
 632
 633         size = offsetof(struct file_dedupe_range __user, info[count]);
 634         if (size > PAGE_SIZE) {
 635                 ret = -ENOMEM;
 636                 goto out;
 637         }
 638
 639         same = memdup_user(argp, size);
 640         if (IS_ERR(same)) {
 641                 ret = PTR_ERR(same);
 642                 same = NULL;
 643                 goto out;
 644         }
 645
 646         same->dest_count = count;
 647         ret = vfs_dedupe_file_range(file, same);
 648         if (ret)
 649                 goto out;
 650
 651         ret = copy_to_user(argp, same, size);
 652         if (ret)
 653                 ret = -EFAULT;
 654
 655 out:
 656         kfree(same);
 657         return ret;
 658 }
 659
 660 /*
 661  * do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
 662  * It's just a simple helper for sys_ioctl and compat_sys_ioctl.
 663  *
 664  * When you add any new common ioctls to the switches above and below,
 665  * please ensure they have compatible arguments in compat mode.
 666  */
 667 static int do_vfs_ioctl(struct file *filp, unsigned int fd,
 668                         unsigned int cmd, unsigned long arg)
 669 {
 670         void __user *argp = (void __user *)arg;
 671         struct inode *inode = file_inode(filp);
 672
 673         switch (cmd) {
 674         case FIOCLEX:
 675                 set_close_on_exec(fd, 1);
 676                 return 0;
 677
 678         case FIONCLEX:
 679                 set_close_on_exec(fd, 0);
 680                 return 0;
 681
 682         case FIONBIO:
 683                 return ioctl_fionbio(filp, argp);
 684
 685         case FIOASYNC:
 686                 return ioctl_fioasync(fd, filp, argp);
 687
 688         case FIOQSIZE:
 689                 if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
 690                     S_ISLNK(inode->i_mode)) {
 691                         loff_t res = inode_get_bytes(inode);
 692                         return copy_to_user(argp, &res, sizeof(res)) ?
 693                                             -EFAULT : 0;
 694                 }
 695
 696                 return -ENOTTY;
 697
 698         case FIFREEZE:
 699                 return ioctl_fsfreeze(filp);
 700
 701         case FITHAW:
 702                 return ioctl_fsthaw(filp);
 703
 704         case FS_IOC_FIEMAP:
 705                 return ioctl_fiemap(filp, argp);
 706
 707         case FIGETBSZ:
 708                 /* anon_bdev filesystems may not have a block size */
 709                 if (!inode->i_sb->s_blocksize)
 710                         return -EINVAL;
 711
 712                 return put_user(inode->i_sb->s_blocksize, (int __user *)argp);
 713
 714         case FICLONE:
 715                 return ioctl_file_clone(filp, arg, 0, 0, 0);
 716
 717         case FICLONERANGE:
 718                 return ioctl_file_clone_range(filp, argp);
 719
 720         case FIDEDUPERANGE:
 721                 return ioctl_file_dedupe_range(filp, argp);
 722
 723         case FIONREAD:
 724                 if (!S_ISREG(inode->i_mode))
 725                         return vfs_ioctl(filp, cmd, arg);
 726
 727                 return put_user(i_size_read(inode) - filp->f_pos,
 728                                 (int __user *)argp);
 729
 730         default:
 731                 if (S_ISREG(inode->i_mode))
 732                         return file_ioctl(filp, cmd, argp);
 733                 break;
 734         }
 735
 736         return -ENOIOCTLCMD;
 737 }
 738
 739 SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
 740 {
 741         struct fd f = fdget(fd);
 742         int error;
 743
 744         if (!f.file)
 745                 return -EBADF;
 746
 747         error = security_file_ioctl(f.file, cmd, arg);
 748         if (error)
 749                 goto out;
 750
 751         error = do_vfs_ioctl(f.file, fd, cmd, arg);
 752         if (error == -ENOIOCTLCMD)
 753                 error = vfs_ioctl(f.file, cmd, arg);
 754
 755 out:
 756         fdput(f);
 757         return error;
 758 }
 759
 760 #ifdef CONFIG_COMPAT
 761 /**
 762  * compat_ptr_ioctl - generic implementation of .compat_ioctl file operation
 763  *
 764  * This is not normally called as a function, but instead set in struct
 765  * file_operations as
 766  *
 767  *     .compat_ioctl = compat_ptr_ioctl,
 768  *
 769  * On most architectures, the compat_ptr_ioctl() just passes all arguments
 770  * to the corresponding ->ioctl handler. The exception is arch/s390, where
 771  * compat_ptr() clears the top bit of a 32-bit pointer value, so user space
 772  * pointers to the second 2GB alias the first 2GB, as is the case for
 773  * native 32-bit s390 user space.
 774  *
 775  * The compat_ptr_ioctl() function must therefore be used only with ioctl
 776  * functions that either ignore the argument or pass a pointer to a
 777  * compatible data type.
 778  *
 779  * If any ioctl command handled by fops->unlocked_ioctl passes a plain
 780  * integer instead of a pointer, or any of the passed data types
 781  * is incompatible between 32-bit and 64-bit architectures, a proper
 782  * handler is required instead of compat_ptr_ioctl.
 783  */
 784 long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 785 {
 786         if (!file->f_op->unlocked_ioctl)
 787                 return -ENOIOCTLCMD;
 788
 789         return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
 790 }
 791 EXPORT_SYMBOL(compat_ptr_ioctl);
 792
 793 COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
 794                        compat_ulong_t, arg)
 795 {
 796         struct fd f = fdget(fd);
 797         int error;
 798
 799         if (!f.file)
 800                 return -EBADF;
 801
 802         /* RED-PEN how should LSM module know it's handling 32bit? */
 803         error = security_file_ioctl(f.file, cmd, arg);
 804         if (error)
 805                 goto out;
 806
 807         switch (cmd) {
 808         /* FICLONE takes an int argument, so don't use compat_ptr() */
 809         case FICLONE:
 810                 error = ioctl_file_clone(f.file, arg, 0, 0, 0);
 811                 break;
 812
 813 #if defined(CONFIG_X86_64)
 814         /* these get messy on amd64 due to alignment differences */
 815         case FS_IOC_RESVSP_32:
 816         case FS_IOC_RESVSP64_32:
 817                 error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
 818                 break;
 819         case FS_IOC_UNRESVSP_32:
 820         case FS_IOC_UNRESVSP64_32:
 821                 error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
 822                                 compat_ptr(arg));
 823                 break;
 824         case FS_IOC_ZERO_RANGE_32:
 825                 error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
 826                                 compat_ptr(arg));
 827                 break;
 828 #endif
 829
 830         /*
 831          * everything else in do_vfs_ioctl() takes either a compatible
 832          * pointer argument or no argument -- call it with a modified
 833          * argument.
 834          */
 835         default:
 836                 error = do_vfs_ioctl(f.file, fd, cmd,
 837                                      (unsigned long)compat_ptr(arg));
 838                 if (error != -ENOIOCTLCMD)
 839                         break;
 840
 841                 if (f.file->f_op->compat_ioctl)
 842                         error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
 843                 if (error == -ENOIOCTLCMD)
 844                         error = -ENOTTY;
 845                 break;
 846         }
 847
 848  out:
 849         fdput(f);
 850
 851         return error;
 852 }
 853 #endif