fs/exfat/file.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
   4  */
   5
   6 #include <linux/slab.h>
   7 #include <linux/compat.h>
   8 #include <linux/cred.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/blkdev.h>
  11 #include <linux/fsnotify.h>
  12 #include <linux/security.h>
  13 #include <linux/msdos_fs.h>
  14 #include <linux/writeback.h>
  15
  16 #include "exfat_raw.h"
  17 #include "exfat_fs.h"
  18
  19 static int exfat_cont_expand(struct inode *inode, loff_t size)
  20 {
  21         int ret;
  22         unsigned int num_clusters, new_num_clusters, last_clu;
  23         struct exfat_inode_info *ei = EXFAT_I(inode);
  24         struct super_block *sb = inode->i_sb;
  25         struct exfat_sb_info *sbi = EXFAT_SB(sb);
  26         struct exfat_chain clu;
  27
  28         ret = inode_newsize_ok(inode, size);
  29         if (ret)
  30                 return ret;
  31
  32         num_clusters = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
  33         new_num_clusters = EXFAT_B_TO_CLU_ROUND_UP(size, sbi);
  34
  35         if (new_num_clusters == num_clusters)
  36                 goto out;
  37
  38         if (num_clusters) {
  39                 exfat_chain_set(&clu, ei->start_clu, num_clusters, ei->flags);
  40                 ret = exfat_find_last_cluster(sb, &clu, &last_clu);
  41                 if (ret)
  42                         return ret;
  43
  44                 clu.dir = last_clu + 1;
  45         } else {
  46                 last_clu = EXFAT_EOF_CLUSTER;
  47                 clu.dir = EXFAT_EOF_CLUSTER;
  48         }
  49
  50         clu.size = 0;
  51         clu.flags = ei->flags;
  52
  53         ret = exfat_alloc_cluster(inode, new_num_clusters - num_clusters,
  54                         &clu, inode_needs_sync(inode));
  55         if (ret)
  56                 return ret;
  57
  58         /* Append new clusters to chain */
  59         if (num_clusters) {
  60                 if (clu.flags != ei->flags)
  61                         if (exfat_chain_cont_cluster(sb, ei->start_clu, num_clusters))
  62                                 goto free_clu;
  63
  64                 if (clu.flags == ALLOC_FAT_CHAIN)
  65                         if (exfat_ent_set(sb, last_clu, clu.dir))
  66                                 goto free_clu;
  67         } else
  68                 ei->start_clu = clu.dir;
  69
  70         ei->flags = clu.flags;
  71
  72 out:
  73         inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
  74         /* Expanded range not zeroed, do not update valid_size */
  75         i_size_write(inode, size);
  76
  77         inode->i_blocks = round_up(size, sbi->cluster_size) >> 9;
  78         mark_inode_dirty(inode);
  79
  80         if (IS_SYNC(inode))
  81                 return write_inode_now(inode, 1);
  82
  83         return 0;
  84
  85 free_clu:
  86         exfat_free_cluster(inode, &clu);
  87         return -EIO;
  88 }
  89
  90 static bool exfat_allow_set_time(struct mnt_idmap *idmap,
  91                                  struct exfat_sb_info *sbi, struct inode *inode)
  92 {
  93         mode_t allow_utime = sbi->options.allow_utime;
  94
  95         if (!vfsuid_eq_kuid(i_uid_into_vfsuid(idmap, inode),
  96                             current_fsuid())) {
  97                 if (vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)))
  98                         allow_utime >>= 3;
  99                 if (allow_utime & MAY_WRITE)
 100                         return true;
 101         }
 102
 103         /* use a default check */
 104         return false;
 105 }
 106
 107 static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
 108                 struct inode *inode, umode_t *mode_ptr)
 109 {
 110         mode_t i_mode, mask, perm;
 111
 112         i_mode = inode->i_mode;
 113
 114         mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ?
 115                 sbi->options.fs_fmask : sbi->options.fs_dmask;
 116         perm = *mode_ptr & ~(S_IFMT | mask);
 117
 118         /* Of the r and x bits, all (subject to umask) must be present.*/
 119         if ((perm & 0555) != (i_mode & 0555))
 120                 return -EPERM;
 121
 122         if (exfat_mode_can_hold_ro(inode)) {
 123                 /*
 124                  * Of the w bits, either all (subject to umask) or none must
 125                  * be present.
 126                  */
 127                 if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
 128                         return -EPERM;
 129         } else {
 130                 /*
 131                  * If exfat_mode_can_hold_ro(inode) is false, can't change
 132                  * w bits.
 133                  */
 134                 if ((perm & 0222) != (0222 & ~mask))
 135                         return -EPERM;
 136         }
 137
 138         *mode_ptr &= S_IFMT | perm;
 139
 140         return 0;
 141 }
 142
 143 /* resize the file length */
 144 int __exfat_truncate(struct inode *inode)
 145 {
 146         unsigned int num_clusters_new, num_clusters_phys;
 147         unsigned int last_clu = EXFAT_FREE_CLUSTER;
 148         struct exfat_chain clu;
 149         struct super_block *sb = inode->i_sb;
 150         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 151         struct exfat_inode_info *ei = EXFAT_I(inode);
 152
 153         /* check if the given file ID is opened */
 154         if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
 155                 return -EPERM;
 156
 157         exfat_set_volume_dirty(sb);
 158
 159         num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
 160         num_clusters_phys = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
 161
 162         exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
 163
 164         if (i_size_read(inode) > 0) {
 165                 /*
 166                  * Truncate FAT chain num_clusters after the first cluster
 167                  * num_clusters = min(new, phys);
 168                  */
 169                 unsigned int num_clusters =
 170                         min(num_clusters_new, num_clusters_phys);
 171
 172                 /*
 173                  * Follow FAT chain
 174                  * (defensive coding - works fine even with corrupted FAT table
 175                  */
 176                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 177                         clu.dir += num_clusters;
 178                         clu.size -= num_clusters;
 179                 } else {
 180                         while (num_clusters > 0) {
 181                                 last_clu = clu.dir;
 182                                 if (exfat_get_next_cluster(sb, &(clu.dir)))
 183                                         return -EIO;
 184
 185                                 num_clusters--;
 186                                 clu.size--;
 187                         }
 188                 }
 189         } else {
 190                 ei->flags = ALLOC_NO_FAT_CHAIN;
 191                 ei->start_clu = EXFAT_EOF_CLUSTER;
 192         }
 193
 194         if (i_size_read(inode) < ei->valid_size)
 195                 ei->valid_size = i_size_read(inode);
 196
 197         if (ei->type == TYPE_FILE)
 198                 ei->attr |= EXFAT_ATTR_ARCHIVE;
 199
 200         /*
 201          * update the directory entry
 202          *
 203          * If the directory entry is updated by mark_inode_dirty(), the
 204          * directory entry will be written after a writeback cycle of
 205          * updating the bitmap/FAT, which may result in clusters being
 206          * freed but referenced by the directory entry in the event of a
 207          * sudden power failure.
 208          * __exfat_write_inode() is called for directory entry, bitmap
 209          * and FAT to be written in a same writeback.
 210          */
 211         if (__exfat_write_inode(inode, inode_needs_sync(inode)))
 212                 return -EIO;
 213
 214         /* cut off from the FAT chain */
 215         if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
 216                         last_clu != EXFAT_EOF_CLUSTER) {
 217                 if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
 218                         return -EIO;
 219         }
 220
 221         /* invalidate cache and free the clusters */
 222         /* clear exfat cache */
 223         exfat_cache_inval_inode(inode);
 224
 225         /* hint information */
 226         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 227         ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
 228
 229         /* hint_stat will be used if this is directory. */
 230         ei->hint_stat.eidx = 0;
 231         ei->hint_stat.clu = ei->start_clu;
 232         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 233
 234         /* free the clusters */
 235         if (exfat_free_cluster(inode, &clu))
 236                 return -EIO;
 237
 238         return 0;
 239 }
 240
 241 void exfat_truncate(struct inode *inode)
 242 {
 243         struct super_block *sb = inode->i_sb;
 244         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 245         struct exfat_inode_info *ei = EXFAT_I(inode);
 246         int err;
 247
 248         mutex_lock(&sbi->s_lock);
 249         if (ei->start_clu == 0) {
 250                 /*
 251                  * Empty start_clu != ~0 (not allocated)
 252                  */
 253                 exfat_fs_error(sb, "tried to truncate zeroed cluster.");
 254                 goto write_size;
 255         }
 256
 257         err = __exfat_truncate(inode);
 258         if (err)
 259                 goto write_size;
 260
 261         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 262 write_size:
 263         mutex_unlock(&sbi->s_lock);
 264 }
 265
 266 int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
 267                   struct kstat *stat, unsigned int request_mask,
 268                   unsigned int query_flags)
 269 {
 270         struct inode *inode = d_backing_inode(path->dentry);
 271         struct exfat_inode_info *ei = EXFAT_I(inode);
 272
 273         generic_fillattr(idmap, request_mask, inode, stat);
 274         exfat_truncate_atime(&stat->atime);
 275         stat->result_mask |= STATX_BTIME;
 276         stat->btime.tv_sec = ei->i_crtime.tv_sec;
 277         stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
 278         stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
 279         return 0;
 280 }
 281
 282 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 283                   struct iattr *attr)
 284 {
 285         struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
 286         struct inode *inode = dentry->d_inode;
 287         unsigned int ia_valid;
 288         int error;
 289
 290         if (unlikely(exfat_forced_shutdown(inode->i_sb)))
 291                 return -EIO;
 292
 293         if ((attr->ia_valid & ATTR_SIZE) &&
 294             attr->ia_size > i_size_read(inode)) {
 295                 error = exfat_cont_expand(inode, attr->ia_size);
 296                 if (error || attr->ia_valid == ATTR_SIZE)
 297                         return error;
 298                 attr->ia_valid &= ~ATTR_SIZE;
 299         }
 300
 301         /* Check for setting the inode time. */
 302         ia_valid = attr->ia_valid;
 303         if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
 304             exfat_allow_set_time(idmap, sbi, inode)) {
 305                 attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
 306                                 ATTR_TIMES_SET);
 307         }
 308
 309         error = setattr_prepare(idmap, dentry, attr);
 310         attr->ia_valid = ia_valid;
 311         if (error)
 312                 goto out;
 313
 314         if (((attr->ia_valid & ATTR_UID) &&
 315               (!uid_eq(from_vfsuid(idmap, i_user_ns(inode), attr->ia_vfsuid),
 316                sbi->options.fs_uid))) ||
 317             ((attr->ia_valid & ATTR_GID) &&
 318               (!gid_eq(from_vfsgid(idmap, i_user_ns(inode), attr->ia_vfsgid),
 319                sbi->options.fs_gid))) ||
 320             ((attr->ia_valid & ATTR_MODE) &&
 321              (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
 322                 error = -EPERM;
 323                 goto out;
 324         }
 325
 326         /*
 327          * We don't return -EPERM here. Yes, strange, but this is too
 328          * old behavior.
 329          */
 330         if (attr->ia_valid & ATTR_MODE) {
 331                 if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
 332                         attr->ia_valid &= ~ATTR_MODE;
 333         }
 334
 335         if (attr->ia_valid & ATTR_SIZE)
 336                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 337
 338         setattr_copy(idmap, inode, attr);
 339         exfat_truncate_inode_atime(inode);
 340
 341         if (attr->ia_valid & ATTR_SIZE) {
 342                 error = exfat_block_truncate_page(inode, attr->ia_size);
 343                 if (error)
 344                         goto out;
 345
 346                 down_write(&EXFAT_I(inode)->truncate_lock);
 347                 truncate_setsize(inode, attr->ia_size);
 348
 349                 /*
 350                  * __exfat_write_inode() is called from exfat_truncate(), inode
 351                  * is already written by it, so mark_inode_dirty() is unneeded.
 352                  */
 353                 exfat_truncate(inode);
 354                 up_write(&EXFAT_I(inode)->truncate_lock);
 355         } else
 356                 mark_inode_dirty(inode);
 357
 358 out:
 359         return error;
 360 }
 361
 362 /*
 363  * modified ioctls from fat/file.c by Welmer Almesberger
 364  */
 365 static int exfat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
 366 {
 367         u32 attr;
 368
 369         inode_lock_shared(inode);
 370         attr = exfat_make_attr(inode);
 371         inode_unlock_shared(inode);
 372
 373         return put_user(attr, user_attr);
 374 }
 375
 376 static int exfat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
 377 {
 378         struct inode *inode = file_inode(file);
 379         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 380         int is_dir = S_ISDIR(inode->i_mode);
 381         u32 attr, oldattr;
 382         struct iattr ia;
 383         int err;
 384
 385         err = get_user(attr, user_attr);
 386         if (err)
 387                 goto out;
 388
 389         err = mnt_want_write_file(file);
 390         if (err)
 391                 goto out;
 392         inode_lock(inode);
 393
 394         oldattr = exfat_make_attr(inode);
 395
 396         /*
 397          * Mask attributes so we don't set reserved fields.
 398          */
 399         attr &= (EXFAT_ATTR_READONLY | EXFAT_ATTR_HIDDEN | EXFAT_ATTR_SYSTEM |
 400                  EXFAT_ATTR_ARCHIVE);
 401         attr |= (is_dir ? EXFAT_ATTR_SUBDIR : 0);
 402
 403         /* Equivalent to a chmod() */
 404         ia.ia_valid = ATTR_MODE | ATTR_CTIME;
 405         ia.ia_ctime = current_time(inode);
 406         if (is_dir)
 407                 ia.ia_mode = exfat_make_mode(sbi, attr, 0777);
 408         else
 409                 ia.ia_mode = exfat_make_mode(sbi, attr, 0666 | (inode->i_mode & 0111));
 410
 411         /* The root directory has no attributes */
 412         if (inode->i_ino == EXFAT_ROOT_INO && attr != EXFAT_ATTR_SUBDIR) {
 413                 err = -EINVAL;
 414                 goto out_unlock_inode;
 415         }
 416
 417         if (((attr | oldattr) & EXFAT_ATTR_SYSTEM) &&
 418             !capable(CAP_LINUX_IMMUTABLE)) {
 419                 err = -EPERM;
 420                 goto out_unlock_inode;
 421         }
 422
 423         /*
 424          * The security check is questionable...  We single
 425          * out the RO attribute for checking by the security
 426          * module, just because it maps to a file mode.
 427          */
 428         err = security_inode_setattr(file_mnt_idmap(file),
 429                                      file->f_path.dentry, &ia);
 430         if (err)
 431                 goto out_unlock_inode;
 432
 433         /* This MUST be done before doing anything irreversible... */
 434         err = exfat_setattr(file_mnt_idmap(file), file->f_path.dentry, &ia);
 435         if (err)
 436                 goto out_unlock_inode;
 437
 438         fsnotify_change(file->f_path.dentry, ia.ia_valid);
 439
 440         exfat_save_attr(inode, attr);
 441         mark_inode_dirty(inode);
 442 out_unlock_inode:
 443         inode_unlock(inode);
 444         mnt_drop_write_file(file);
 445 out:
 446         return err;
 447 }
 448
 449 static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg)
 450 {
 451         struct fstrim_range range;
 452         int ret = 0;
 453
 454         if (!capable(CAP_SYS_ADMIN))
 455                 return -EPERM;
 456
 457         if (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
 458                 return -EOPNOTSUPP;
 459
 460         if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
 461                 return -EFAULT;
 462
 463         range.minlen = max_t(unsigned int, range.minlen,
 464                                 bdev_discard_granularity(inode->i_sb->s_bdev));
 465
 466         ret = exfat_trim_fs(inode, &range);
 467         if (ret < 0)
 468                 return ret;
 469
 470         if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
 471                 return -EFAULT;
 472
 473         return 0;
 474 }
 475
 476 static int exfat_ioctl_shutdown(struct super_block *sb, unsigned long arg)
 477 {
 478         u32 flags;
 479
 480         if (!capable(CAP_SYS_ADMIN))
 481                 return -EPERM;
 482
 483         if (get_user(flags, (__u32 __user *)arg))
 484                 return -EFAULT;
 485
 486         return exfat_force_shutdown(sb, flags);
 487 }
 488
 489 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 490 {
 491         struct inode *inode = file_inode(filp);
 492         u32 __user *user_attr = (u32 __user *)arg;
 493
 494         switch (cmd) {
 495         case FAT_IOCTL_GET_ATTRIBUTES:
 496                 return exfat_ioctl_get_attributes(inode, user_attr);
 497         case FAT_IOCTL_SET_ATTRIBUTES:
 498                 return exfat_ioctl_set_attributes(filp, user_attr);
 499         case EXFAT_IOC_SHUTDOWN:
 500                 return exfat_ioctl_shutdown(inode->i_sb, arg);
 501         case FITRIM:
 502                 return exfat_ioctl_fitrim(inode, arg);
 503         default:
 504                 return -ENOTTY;
 505         }
 506 }
 507
 508 #ifdef CONFIG_COMPAT
 509 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
 510                                 unsigned long arg)
 511 {
 512         return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
 513 }
 514 #endif
 515
 516 int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
 517 {
 518         struct inode *inode = filp->f_mapping->host;
 519         int err;
 520
 521         if (unlikely(exfat_forced_shutdown(inode->i_sb)))
 522                 return -EIO;
 523
 524         err = __generic_file_fsync(filp, start, end, datasync);
 525         if (err)
 526                 return err;
 527
 528         err = sync_blockdev(inode->i_sb->s_bdev);
 529         if (err)
 530                 return err;
 531
 532         return blkdev_issue_flush(inode->i_sb->s_bdev);
 533 }
 534
 535 static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
 536 {
 537         int err;
 538         loff_t pos;
 539         struct inode *inode = file_inode(file);
 540         struct exfat_inode_info *ei = EXFAT_I(inode);
 541         struct address_space *mapping = inode->i_mapping;
 542         const struct address_space_operations *ops = mapping->a_ops;
 543
 544         pos = ei->valid_size;
 545         while (pos < new_valid_size) {
 546                 u32 len;
 547                 struct folio *folio;
 548
 549                 len = PAGE_SIZE - (pos & (PAGE_SIZE - 1));
 550                 if (pos + len > new_valid_size)
 551                         len = new_valid_size - pos;
 552
 553                 err = ops->write_begin(file, mapping, pos, len, &folio, NULL);
 554                 if (err)
 555                         goto out;
 556
 557                 err = ops->write_end(file, mapping, pos, len, len, folio, NULL);
 558                 if (err < 0)
 559                         goto out;
 560                 pos += len;
 561
 562                 balance_dirty_pages_ratelimited(mapping);
 563                 cond_resched();
 564         }
 565
 566 out:
 567         return err;
 568 }
 569
 570 static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
 571 {
 572         ssize_t ret;
 573         struct file *file = iocb->ki_filp;
 574         struct inode *inode = file_inode(file);
 575         struct exfat_inode_info *ei = EXFAT_I(inode);
 576         loff_t pos = iocb->ki_pos;
 577         loff_t valid_size;
 578
 579         inode_lock(inode);
 580
 581         valid_size = ei->valid_size;
 582
 583         ret = generic_write_checks(iocb, iter);
 584         if (ret < 0)
 585                 goto unlock;
 586
 587         if (pos > valid_size) {
 588                 ret = exfat_extend_valid_size(file, pos);
 589                 if (ret < 0 && ret != -ENOSPC) {
 590                         exfat_err(inode->i_sb,
 591                                 "write: fail to zero from %llu to %llu(%zd)",
 592                                 valid_size, pos, ret);
 593                 }
 594                 if (ret < 0)
 595                         goto unlock;
 596         }
 597
 598         ret = __generic_file_write_iter(iocb, iter);
 599         if (ret < 0)
 600                 goto unlock;
 601
 602         inode_unlock(inode);
 603
 604         if (pos > valid_size)
 605                 pos = valid_size;
 606
 607         if (iocb_is_dsync(iocb) && iocb->ki_pos > pos) {
 608                 ssize_t err = vfs_fsync_range(file, pos, iocb->ki_pos - 1,
 609                                 iocb->ki_flags & IOCB_SYNC);
 610                 if (err < 0)
 611                         return err;
 612         }
 613
 614         return ret;
 615
 616 unlock:
 617         inode_unlock(inode);
 618
 619         return ret;
 620 }
 621
 622 static vm_fault_t exfat_page_mkwrite(struct vm_fault *vmf)
 623 {
 624         int err;
 625         struct vm_area_struct *vma = vmf->vma;
 626         struct file *file = vma->vm_file;
 627         struct inode *inode = file_inode(file);
 628         struct exfat_inode_info *ei = EXFAT_I(inode);
 629         loff_t start, end;
 630
 631         if (!inode_trylock(inode))
 632                 return VM_FAULT_RETRY;
 633
 634         start = ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
 635         end = min_t(loff_t, i_size_read(inode),
 636                         start + vma->vm_end - vma->vm_start);
 637
 638         if (ei->valid_size < end) {
 639                 err = exfat_extend_valid_size(file, end);
 640                 if (err < 0) {
 641                         inode_unlock(inode);
 642                         return vmf_fs_error(err);
 643                 }
 644         }
 645
 646         inode_unlock(inode);
 647
 648         return filemap_page_mkwrite(vmf);
 649 }
 650
 651 static const struct vm_operations_struct exfat_file_vm_ops = {
 652         .fault          = filemap_fault,
 653         .map_pages      = filemap_map_pages,
 654         .page_mkwrite   = exfat_page_mkwrite,
 655 };
 656
 657 static int exfat_file_mmap(struct file *file, struct vm_area_struct *vma)
 658 {
 659         file_accessed(file);
 660         vma->vm_ops = &exfat_file_vm_ops;
 661         return 0;
 662 }
 663
 664 const struct file_operations exfat_file_operations = {
 665         .llseek         = generic_file_llseek,
 666         .read_iter      = generic_file_read_iter,
 667         .write_iter     = exfat_file_write_iter,
 668         .unlocked_ioctl = exfat_ioctl,
 669 #ifdef CONFIG_COMPAT
 670         .compat_ioctl = exfat_compat_ioctl,
 671 #endif
 672         .mmap           = exfat_file_mmap,
 673         .fsync          = exfat_file_fsync,
 674         .splice_read    = filemap_splice_read,
 675         .splice_write   = iter_file_splice_write,
 676 };
 677
 678 const struct inode_operations exfat_file_inode_operations = {
 679         .setattr     = exfat_setattr,
 680         .getattr     = exfat_getattr,
 681 };