fs/exfat/inode.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/init.h>
   7 #include <linux/buffer_head.h>
   8 #include <linux/mpage.h>
   9 #include <linux/bio.h>
  10 #include <linux/blkdev.h>
  11 #include <linux/time.h>
  12 #include <linux/writeback.h>
  13 #include <linux/uio.h>
  14 #include <linux/random.h>
  15 #include <linux/iversion.h>
  16
  17 #include "exfat_raw.h"
  18 #include "exfat_fs.h"
  19
  20 static int __exfat_write_inode(struct inode *inode, int sync)
  21 {
  22         unsigned long long on_disk_size;
  23         struct exfat_dentry *ep, *ep2;
  24         struct exfat_entry_set_cache *es = NULL;
  25         struct super_block *sb = inode->i_sb;
  26         struct exfat_sb_info *sbi = EXFAT_SB(sb);
  27         struct exfat_inode_info *ei = EXFAT_I(inode);
  28         bool is_dir = (ei->type == TYPE_DIR) ? true : false;
  29
  30         if (inode->i_ino == EXFAT_ROOT_INO)
  31                 return 0;
  32
  33         /*
  34          * If the indode is already unlinked, there is no need for updating it.
  35          */
  36         if (ei->dir.dir == DIR_DELETED)
  37                 return 0;
  38
  39         if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
  40                 return 0;
  41
  42         exfat_set_volume_dirty(sb);
  43
  44         /* get the directory entry of given file or directory */
  45         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES);
  46         if (!es)
  47                 return -EIO;
  48         ep = exfat_get_dentry_cached(es, 0);
  49         ep2 = exfat_get_dentry_cached(es, 1);
  50
  51         ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
  52
  53         /* set FILE_INFO structure using the acquired struct exfat_dentry */
  54         exfat_set_entry_time(sbi, &ei->i_crtime,
  55                         &ep->dentry.file.create_tz,
  56                         &ep->dentry.file.create_time,
  57                         &ep->dentry.file.create_date,
  58                         &ep->dentry.file.create_time_cs);
  59         exfat_set_entry_time(sbi, &inode->i_mtime,
  60                         &ep->dentry.file.modify_tz,
  61                         &ep->dentry.file.modify_time,
  62                         &ep->dentry.file.modify_date,
  63                         &ep->dentry.file.modify_time_cs);
  64         exfat_set_entry_time(sbi, &inode->i_atime,
  65                         &ep->dentry.file.access_tz,
  66                         &ep->dentry.file.access_time,
  67                         &ep->dentry.file.access_date,
  68                         NULL);
  69
  70         /* File size should be zero if there is no cluster allocated */
  71         on_disk_size = i_size_read(inode);
  72
  73         if (ei->start_clu == EXFAT_EOF_CLUSTER)
  74                 on_disk_size = 0;
  75
  76         ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
  77         ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
  78
  79         exfat_update_dir_chksum_with_entry_set(es);
  80         return exfat_free_dentry_set(es, sync);
  81 }
  82
  83 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
  84 {
  85         int ret;
  86
  87         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
  88         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
  89         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
  90
  91         return ret;
  92 }
  93
  94 void exfat_sync_inode(struct inode *inode)
  95 {
  96         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
  97         __exfat_write_inode(inode, 1);
  98 }
  99
 100 /*
 101  * Input: inode, (logical) clu_offset, target allocation area
 102  * Output: errcode, cluster number
 103  * *clu = (~0), if it's unable to allocate a new cluster
 104  */
 105 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 106                 unsigned int *clu, int create)
 107 {
 108         int ret, modified = false;
 109         unsigned int last_clu;
 110         struct exfat_chain new_clu;
 111         struct super_block *sb = inode->i_sb;
 112         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 113         struct exfat_inode_info *ei = EXFAT_I(inode);
 114         unsigned int local_clu_offset = clu_offset;
 115         unsigned int num_to_be_allocated = 0, num_clusters = 0;
 116
 117         if (ei->i_size_ondisk > 0)
 118                 num_clusters =
 119                         EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
 120
 121         if (clu_offset >= num_clusters)
 122                 num_to_be_allocated = clu_offset - num_clusters + 1;
 123
 124         if (!create && (num_to_be_allocated > 0)) {
 125                 *clu = EXFAT_EOF_CLUSTER;
 126                 return 0;
 127         }
 128
 129         *clu = last_clu = ei->start_clu;
 130
 131         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 132                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 133                         last_clu += clu_offset - 1;
 134
 135                         if (clu_offset == num_clusters)
 136                                 *clu = EXFAT_EOF_CLUSTER;
 137                         else
 138                                 *clu += clu_offset;
 139                 }
 140         } else if (ei->type == TYPE_FILE) {
 141                 unsigned int fclus = 0;
 142                 int err = exfat_get_cluster(inode, clu_offset,
 143                                 &fclus, clu, &last_clu, 1);
 144                 if (err)
 145                         return -EIO;
 146
 147                 clu_offset -= fclus;
 148         } else {
 149                 /* hint information */
 150                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
 151                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
 152                         clu_offset -= ei->hint_bmap.off;
 153                         /* hint_bmap.clu should be valid */
 154                         WARN_ON(ei->hint_bmap.clu < 2);
 155                         *clu = ei->hint_bmap.clu;
 156                 }
 157
 158                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 159                         last_clu = *clu;
 160                         if (exfat_get_next_cluster(sb, clu))
 161                                 return -EIO;
 162                         clu_offset--;
 163                 }
 164         }
 165
 166         if (*clu == EXFAT_EOF_CLUSTER) {
 167                 exfat_set_volume_dirty(sb);
 168
 169                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 170                                 EXFAT_EOF_CLUSTER : last_clu + 1;
 171                 new_clu.size = 0;
 172                 new_clu.flags = ei->flags;
 173
 174                 /* allocate a cluster */
 175                 if (num_to_be_allocated < 1) {
 176                         /* Broken FAT (i_sze > allocated FAT) */
 177                         exfat_fs_error(sb, "broken FAT chain.");
 178                         return -EIO;
 179                 }
 180
 181                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
 182                                 inode_needs_sync(inode));
 183                 if (ret)
 184                         return ret;
 185
 186                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
 187                     new_clu.dir == EXFAT_FREE_CLUSTER) {
 188                         exfat_fs_error(sb,
 189                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
 190                                 last_clu, new_clu.dir);
 191                         return -EIO;
 192                 }
 193
 194                 /* append to the FAT chain */
 195                 if (last_clu == EXFAT_EOF_CLUSTER) {
 196                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 197                                 ei->flags = ALLOC_FAT_CHAIN;
 198                         ei->start_clu = new_clu.dir;
 199                         modified = true;
 200                 } else {
 201                         if (new_clu.flags != ei->flags) {
 202                                 /* no-fat-chain bit is disabled,
 203                                  * so fat-chain should be synced with
 204                                  * alloc-bitmap
 205                                  */
 206                                 exfat_chain_cont_cluster(sb, ei->start_clu,
 207                                         num_clusters);
 208                                 ei->flags = ALLOC_FAT_CHAIN;
 209                                 modified = true;
 210                         }
 211                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 212                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 213                                         return -EIO;
 214                 }
 215
 216                 num_clusters += num_to_be_allocated;
 217                 *clu = new_clu.dir;
 218
 219                 if (ei->dir.dir != DIR_DELETED && modified) {
 220                         struct exfat_dentry *ep;
 221                         struct exfat_entry_set_cache *es;
 222                         int err;
 223
 224                         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 225                                 ES_ALL_ENTRIES);
 226                         if (!es)
 227                                 return -EIO;
 228                         /* get stream entry */
 229                         ep = exfat_get_dentry_cached(es, 1);
 230
 231                         /* update directory entry */
 232                         ep->dentry.stream.flags = ei->flags;
 233                         ep->dentry.stream.start_clu =
 234                                 cpu_to_le32(ei->start_clu);
 235                         ep->dentry.stream.valid_size =
 236                                 cpu_to_le64(i_size_read(inode));
 237                         ep->dentry.stream.size =
 238                                 ep->dentry.stream.valid_size;
 239
 240                         exfat_update_dir_chksum_with_entry_set(es);
 241                         err = exfat_free_dentry_set(es, inode_needs_sync(inode));
 242                         if (err)
 243                                 return err;
 244                 } /* end of if != DIR_DELETED */
 245
 246                 inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
 247
 248                 /*
 249                  * Move *clu pointer along FAT chains (hole care) because the
 250                  * caller of this function expect *clu to be the last cluster.
 251                  * This only works when num_to_be_allocated >= 2,
 252                  * *clu = (the first cluster of the allocated chain) =>
 253                  * (the last cluster of ...)
 254                  */
 255                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 256                         *clu += num_to_be_allocated - 1;
 257                 } else {
 258                         while (num_to_be_allocated > 1) {
 259                                 if (exfat_get_next_cluster(sb, clu))
 260                                         return -EIO;
 261                                 num_to_be_allocated--;
 262                         }
 263                 }
 264
 265         }
 266
 267         /* hint information */
 268         ei->hint_bmap.off = local_clu_offset;
 269         ei->hint_bmap.clu = *clu;
 270
 271         return 0;
 272 }
 273
 274 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 275                 struct buffer_head *bh, loff_t pos)
 276 {
 277         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 278                 return -EIO;
 279         set_buffer_new(bh);
 280
 281         /*
 282          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 283          */
 284         if (ei->i_size_ondisk > ei->i_size_aligned)
 285                 ei->i_size_aligned = ei->i_size_ondisk;
 286         return 0;
 287 }
 288
 289 static int exfat_get_block(struct inode *inode, sector_t iblock,
 290                 struct buffer_head *bh_result, int create)
 291 {
 292         struct exfat_inode_info *ei = EXFAT_I(inode);
 293         struct super_block *sb = inode->i_sb;
 294         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 295         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 296         int err = 0;
 297         unsigned long mapped_blocks = 0;
 298         unsigned int cluster, sec_offset;
 299         sector_t last_block;
 300         sector_t phys = 0;
 301         loff_t pos;
 302
 303         mutex_lock(&sbi->s_lock);
 304         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 305         if (iblock >= last_block && !create)
 306                 goto done;
 307
 308         /* Is this block already allocated? */
 309         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 310                         &cluster, create);
 311         if (err) {
 312                 if (err != -ENOSPC)
 313                         exfat_fs_error_ratelimit(sb,
 314                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 315                                 inode, (unsigned long long)iblock, err);
 316                 goto unlock_ret;
 317         }
 318
 319         if (cluster == EXFAT_EOF_CLUSTER)
 320                 goto done;
 321
 322         /* sector offset in cluster */
 323         sec_offset = iblock & (sbi->sect_per_clus - 1);
 324
 325         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 326         mapped_blocks = sbi->sect_per_clus - sec_offset;
 327         max_blocks = min(mapped_blocks, max_blocks);
 328
 329         /* Treat newly added block / cluster */
 330         if (iblock < last_block)
 331                 create = 0;
 332
 333         if (create || buffer_delay(bh_result)) {
 334                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 335                 if (ei->i_size_ondisk < pos)
 336                         ei->i_size_ondisk = pos;
 337         }
 338
 339         if (create) {
 340                 err = exfat_map_new_buffer(ei, bh_result, pos);
 341                 if (err) {
 342                         exfat_fs_error(sb,
 343                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 344                                         pos, ei->i_size_aligned);
 345                         goto unlock_ret;
 346                 }
 347         }
 348
 349         if (buffer_delay(bh_result))
 350                 clear_buffer_delay(bh_result);
 351         map_bh(bh_result, sb, phys);
 352 done:
 353         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 354 unlock_ret:
 355         mutex_unlock(&sbi->s_lock);
 356         return err;
 357 }
 358
 359 static int exfat_readpage(struct file *file, struct page *page)
 360 {
 361         return mpage_readpage(page, exfat_get_block);
 362 }
 363
 364 static void exfat_readahead(struct readahead_control *rac)
 365 {
 366         mpage_readahead(rac, exfat_get_block);
 367 }
 368
 369 static int exfat_writepage(struct page *page, struct writeback_control *wbc)
 370 {
 371         return block_write_full_page(page, exfat_get_block, wbc);
 372 }
 373
 374 static int exfat_writepages(struct address_space *mapping,
 375                 struct writeback_control *wbc)
 376 {
 377         return mpage_writepages(mapping, wbc, exfat_get_block);
 378 }
 379
 380 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 381 {
 382         struct inode *inode = mapping->host;
 383
 384         if (to > i_size_read(inode)) {
 385                 truncate_pagecache(inode, i_size_read(inode));
 386                 exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
 387         }
 388 }
 389
 390 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 391                 loff_t pos, unsigned int len, unsigned int flags,
 392                 struct page **pagep, void **fsdata)
 393 {
 394         int ret;
 395
 396         *pagep = NULL;
 397         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 398                                exfat_get_block,
 399                                &EXFAT_I(mapping->host)->i_size_ondisk);
 400
 401         if (ret < 0)
 402                 exfat_write_failed(mapping, pos+len);
 403
 404         return ret;
 405 }
 406
 407 static int exfat_write_end(struct file *file, struct address_space *mapping,
 408                 loff_t pos, unsigned int len, unsigned int copied,
 409                 struct page *pagep, void *fsdata)
 410 {
 411         struct inode *inode = mapping->host;
 412         struct exfat_inode_info *ei = EXFAT_I(inode);
 413         int err;
 414
 415         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 416
 417         if (ei->i_size_aligned < i_size_read(inode)) {
 418                 exfat_fs_error(inode->i_sb,
 419                         "invalid size(size(%llu) > aligned(%llu)\n",
 420                         i_size_read(inode), ei->i_size_aligned);
 421                 return -EIO;
 422         }
 423
 424         if (err < len)
 425                 exfat_write_failed(mapping, pos+len);
 426
 427         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 428                 inode->i_mtime = inode->i_ctime = current_time(inode);
 429                 ei->attr |= ATTR_ARCHIVE;
 430                 mark_inode_dirty(inode);
 431         }
 432
 433         return err;
 434 }
 435
 436 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 437 {
 438         struct address_space *mapping = iocb->ki_filp->f_mapping;
 439         struct inode *inode = mapping->host;
 440         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 441         int rw = iov_iter_rw(iter);
 442         ssize_t ret;
 443
 444         if (rw == WRITE) {
 445                 /*
 446                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 447                  * so we need to update the ->i_size_aligned to block boundary.
 448                  *
 449                  * But we must fill the remaining area or hole by nul for
 450                  * updating ->i_size_aligned
 451                  *
 452                  * Return 0, and fallback to normal buffered write.
 453                  */
 454                 if (EXFAT_I(inode)->i_size_aligned < size)
 455                         return 0;
 456         }
 457
 458         /*
 459          * Need to use the DIO_LOCKING for avoiding the race
 460          * condition of exfat_get_block() and ->truncate().
 461          */
 462         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 463         if (ret < 0 && (rw & WRITE))
 464                 exfat_write_failed(mapping, size);
 465         return ret;
 466 }
 467
 468 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 469 {
 470         sector_t blocknr;
 471
 472         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 473         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 474         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 475         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 476         return blocknr;
 477 }
 478
 479 /*
 480  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 481  * up to the end of the block which corresponds to `from'.
 482  * This is required during truncate to physically zeroout the tail end
 483  * of that block so it doesn't yield old data if the file is later grown.
 484  * Also, avoid causing failure from fsx for cases of "data past EOF"
 485  */
 486 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 487 {
 488         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 489 }
 490
 491 static const struct address_space_operations exfat_aops = {
 492         .set_page_dirty = __set_page_dirty_buffers,
 493         .readpage       = exfat_readpage,
 494         .readahead      = exfat_readahead,
 495         .writepage      = exfat_writepage,
 496         .writepages     = exfat_writepages,
 497         .write_begin    = exfat_write_begin,
 498         .write_end      = exfat_write_end,
 499         .direct_IO      = exfat_direct_IO,
 500         .bmap           = exfat_aop_bmap
 501 };
 502
 503 static inline unsigned long exfat_hash(loff_t i_pos)
 504 {
 505         return hash_32(i_pos, EXFAT_HASH_BITS);
 506 }
 507
 508 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 509 {
 510         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 511         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 512
 513         spin_lock(&sbi->inode_hash_lock);
 514         EXFAT_I(inode)->i_pos = i_pos;
 515         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 516         spin_unlock(&sbi->inode_hash_lock);
 517 }
 518
 519 void exfat_unhash_inode(struct inode *inode)
 520 {
 521         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 522
 523         spin_lock(&sbi->inode_hash_lock);
 524         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 525         EXFAT_I(inode)->i_pos = 0;
 526         spin_unlock(&sbi->inode_hash_lock);
 527 }
 528
 529 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 530 {
 531         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 532         struct exfat_inode_info *info;
 533         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 534         struct inode *inode = NULL;
 535
 536         spin_lock(&sbi->inode_hash_lock);
 537         hlist_for_each_entry(info, head, i_hash_fat) {
 538                 WARN_ON(info->vfs_inode.i_sb != sb);
 539
 540                 if (i_pos != info->i_pos)
 541                         continue;
 542                 inode = igrab(&info->vfs_inode);
 543                 if (inode)
 544                         break;
 545         }
 546         spin_unlock(&sbi->inode_hash_lock);
 547         return inode;
 548 }
 549
 550 /* doesn't deal with root inode */
 551 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 552 {
 553         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 554         struct exfat_inode_info *ei = EXFAT_I(inode);
 555         loff_t size = info->size;
 556
 557         ei->dir = info->dir;
 558         ei->entry = info->entry;
 559         ei->attr = info->attr;
 560         ei->start_clu = info->start_clu;
 561         ei->flags = info->flags;
 562         ei->type = info->type;
 563
 564         ei->version = 0;
 565         ei->hint_stat.eidx = 0;
 566         ei->hint_stat.clu = info->start_clu;
 567         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 568         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 569         ei->i_pos = 0;
 570
 571         inode->i_uid = sbi->options.fs_uid;
 572         inode->i_gid = sbi->options.fs_gid;
 573         inode_inc_iversion(inode);
 574         inode->i_generation = prandom_u32();
 575
 576         if (info->attr & ATTR_SUBDIR) { /* directory */
 577                 inode->i_generation &= ~1;
 578                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 579                 inode->i_op = &exfat_dir_inode_operations;
 580                 inode->i_fop = &exfat_dir_operations;
 581                 set_nlink(inode, info->num_subdirs);
 582         } else { /* regular file */
 583                 inode->i_generation |= 1;
 584                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 585                 inode->i_op = &exfat_file_inode_operations;
 586                 inode->i_fop = &exfat_file_operations;
 587                 inode->i_mapping->a_ops = &exfat_aops;
 588                 inode->i_mapping->nrpages = 0;
 589         }
 590
 591         i_size_write(inode, size);
 592
 593         /* ondisk and aligned size should be aligned with block size */
 594         if (size & (inode->i_sb->s_blocksize - 1)) {
 595                 size |= (inode->i_sb->s_blocksize - 1);
 596                 size++;
 597         }
 598
 599         ei->i_size_aligned = size;
 600         ei->i_size_ondisk = size;
 601
 602         exfat_save_attr(inode, info->attr);
 603
 604         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 605         inode->i_mtime = info->mtime;
 606         inode->i_ctime = info->mtime;
 607         ei->i_crtime = info->crtime;
 608         inode->i_atime = info->atime;
 609
 610         return 0;
 611 }
 612
 613 struct inode *exfat_build_inode(struct super_block *sb,
 614                 struct exfat_dir_entry *info, loff_t i_pos)
 615 {
 616         struct inode *inode;
 617         int err;
 618
 619         inode = exfat_iget(sb, i_pos);
 620         if (inode)
 621                 goto out;
 622         inode = new_inode(sb);
 623         if (!inode) {
 624                 inode = ERR_PTR(-ENOMEM);
 625                 goto out;
 626         }
 627         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 628         inode_set_iversion(inode, 1);
 629         err = exfat_fill_inode(inode, info);
 630         if (err) {
 631                 iput(inode);
 632                 inode = ERR_PTR(err);
 633                 goto out;
 634         }
 635         exfat_hash_inode(inode, i_pos);
 636         insert_inode_hash(inode);
 637 out:
 638         return inode;
 639 }
 640
 641 void exfat_evict_inode(struct inode *inode)
 642 {
 643         truncate_inode_pages(&inode->i_data, 0);
 644
 645         if (!inode->i_nlink) {
 646                 i_size_write(inode, 0);
 647                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 648                 __exfat_truncate(inode, 0);
 649                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 650         }
 651
 652         invalidate_inode_buffers(inode);
 653         clear_inode(inode);
 654         exfat_cache_inval_inode(inode);
 655         exfat_unhash_inode(inode);
 656 }