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         ei->rwoffset = EXFAT_CLU_TO_B(clu_offset, sbi);
 118
 119         if (EXFAT_I(inode)->i_size_ondisk > 0)
 120                 num_clusters =
 121                         EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk,
 122                         sbi);
 123
 124         if (clu_offset >= num_clusters)
 125                 num_to_be_allocated = clu_offset - num_clusters + 1;
 126
 127         if (!create && (num_to_be_allocated > 0)) {
 128                 *clu = EXFAT_EOF_CLUSTER;
 129                 return 0;
 130         }
 131
 132         *clu = last_clu = ei->start_clu;
 133
 134         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 135                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 136                         last_clu += clu_offset - 1;
 137
 138                         if (clu_offset == num_clusters)
 139                                 *clu = EXFAT_EOF_CLUSTER;
 140                         else
 141                                 *clu += clu_offset;
 142                 }
 143         } else if (ei->type == TYPE_FILE) {
 144                 unsigned int fclus = 0;
 145                 int err = exfat_get_cluster(inode, clu_offset,
 146                                 &fclus, clu, &last_clu, 1);
 147                 if (err)
 148                         return -EIO;
 149
 150                 clu_offset -= fclus;
 151         } else {
 152                 /* hint information */
 153                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
 154                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
 155                         clu_offset -= ei->hint_bmap.off;
 156                         /* hint_bmap.clu should be valid */
 157                         WARN_ON(ei->hint_bmap.clu < 2);
 158                         *clu = ei->hint_bmap.clu;
 159                 }
 160
 161                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 162                         last_clu = *clu;
 163                         if (exfat_get_next_cluster(sb, clu))
 164                                 return -EIO;
 165                         clu_offset--;
 166                 }
 167         }
 168
 169         if (*clu == EXFAT_EOF_CLUSTER) {
 170                 exfat_set_volume_dirty(sb);
 171
 172                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 173                                 EXFAT_EOF_CLUSTER : last_clu + 1;
 174                 new_clu.size = 0;
 175                 new_clu.flags = ei->flags;
 176
 177                 /* allocate a cluster */
 178                 if (num_to_be_allocated < 1) {
 179                         /* Broken FAT (i_sze > allocated FAT) */
 180                         exfat_fs_error(sb, "broken FAT chain.");
 181                         return -EIO;
 182                 }
 183
 184                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu);
 185                 if (ret)
 186                         return ret;
 187
 188                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
 189                     new_clu.dir == EXFAT_FREE_CLUSTER) {
 190                         exfat_fs_error(sb,
 191                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
 192                                 last_clu, new_clu.dir);
 193                         return -EIO;
 194                 }
 195
 196                 /* append to the FAT chain */
 197                 if (last_clu == EXFAT_EOF_CLUSTER) {
 198                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 199                                 ei->flags = ALLOC_FAT_CHAIN;
 200                         ei->start_clu = new_clu.dir;
 201                         modified = true;
 202                 } else {
 203                         if (new_clu.flags != ei->flags) {
 204                                 /* no-fat-chain bit is disabled,
 205                                  * so fat-chain should be synced with
 206                                  * alloc-bitmap
 207                                  */
 208                                 exfat_chain_cont_cluster(sb, ei->start_clu,
 209                                         num_clusters);
 210                                 ei->flags = ALLOC_FAT_CHAIN;
 211                                 modified = true;
 212                         }
 213                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 214                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 215                                         return -EIO;
 216                 }
 217
 218                 num_clusters += num_to_be_allocated;
 219                 *clu = new_clu.dir;
 220
 221                 if (ei->dir.dir != DIR_DELETED && modified) {
 222                         struct exfat_dentry *ep;
 223                         struct exfat_entry_set_cache *es;
 224                         int err;
 225
 226                         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 227                                 ES_ALL_ENTRIES);
 228                         if (!es)
 229                                 return -EIO;
 230                         /* get stream entry */
 231                         ep = exfat_get_dentry_cached(es, 1);
 232
 233                         /* update directory entry */
 234                         ep->dentry.stream.flags = ei->flags;
 235                         ep->dentry.stream.start_clu =
 236                                 cpu_to_le32(ei->start_clu);
 237                         ep->dentry.stream.valid_size =
 238                                 cpu_to_le64(i_size_read(inode));
 239                         ep->dentry.stream.size =
 240                                 ep->dentry.stream.valid_size;
 241
 242                         exfat_update_dir_chksum_with_entry_set(es);
 243                         err = exfat_free_dentry_set(es, inode_needs_sync(inode));
 244                         if (err)
 245                                 return err;
 246                 } /* end of if != DIR_DELETED */
 247
 248                 inode->i_blocks +=
 249                         num_to_be_allocated << sbi->sect_per_clus_bits;
 250
 251                 /*
 252                  * Move *clu pointer along FAT chains (hole care) because the
 253                  * caller of this function expect *clu to be the last cluster.
 254                  * This only works when num_to_be_allocated >= 2,
 255                  * *clu = (the first cluster of the allocated chain) =>
 256                  * (the last cluster of ...)
 257                  */
 258                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 259                         *clu += num_to_be_allocated - 1;
 260                 } else {
 261                         while (num_to_be_allocated > 1) {
 262                                 if (exfat_get_next_cluster(sb, clu))
 263                                         return -EIO;
 264                                 num_to_be_allocated--;
 265                         }
 266                 }
 267
 268         }
 269
 270         /* hint information */
 271         ei->hint_bmap.off = local_clu_offset;
 272         ei->hint_bmap.clu = *clu;
 273
 274         return 0;
 275 }
 276
 277 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 278                 struct buffer_head *bh, loff_t pos)
 279 {
 280         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 281                 return -EIO;
 282         set_buffer_new(bh);
 283
 284         /*
 285          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 286          */
 287         if (ei->i_size_ondisk > ei->i_size_aligned)
 288                 ei->i_size_aligned = ei->i_size_ondisk;
 289         return 0;
 290 }
 291
 292 static int exfat_get_block(struct inode *inode, sector_t iblock,
 293                 struct buffer_head *bh_result, int create)
 294 {
 295         struct exfat_inode_info *ei = EXFAT_I(inode);
 296         struct super_block *sb = inode->i_sb;
 297         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 298         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 299         int err = 0;
 300         unsigned long mapped_blocks = 0;
 301         unsigned int cluster, sec_offset;
 302         sector_t last_block;
 303         sector_t phys = 0;
 304         loff_t pos;
 305
 306         mutex_lock(&sbi->s_lock);
 307         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 308         if (iblock >= last_block && !create)
 309                 goto done;
 310
 311         /* Is this block already allocated? */
 312         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 313                         &cluster, create);
 314         if (err) {
 315                 if (err != -ENOSPC)
 316                         exfat_fs_error_ratelimit(sb,
 317                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 318                                 inode, (unsigned long long)iblock, err);
 319                 goto unlock_ret;
 320         }
 321
 322         if (cluster == EXFAT_EOF_CLUSTER)
 323                 goto done;
 324
 325         /* sector offset in cluster */
 326         sec_offset = iblock & (sbi->sect_per_clus - 1);
 327
 328         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 329         mapped_blocks = sbi->sect_per_clus - sec_offset;
 330         max_blocks = min(mapped_blocks, max_blocks);
 331
 332         /* Treat newly added block / cluster */
 333         if (iblock < last_block)
 334                 create = 0;
 335
 336         if (create || buffer_delay(bh_result)) {
 337                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 338                 if (ei->i_size_ondisk < pos)
 339                         ei->i_size_ondisk = pos;
 340         }
 341
 342         if (create) {
 343                 err = exfat_map_new_buffer(ei, bh_result, pos);
 344                 if (err) {
 345                         exfat_fs_error(sb,
 346                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 347                                         pos, ei->i_size_aligned);
 348                         goto unlock_ret;
 349                 }
 350         }
 351
 352         if (buffer_delay(bh_result))
 353                 clear_buffer_delay(bh_result);
 354         map_bh(bh_result, sb, phys);
 355 done:
 356         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 357 unlock_ret:
 358         mutex_unlock(&sbi->s_lock);
 359         return err;
 360 }
 361
 362 static int exfat_readpage(struct file *file, struct page *page)
 363 {
 364         return mpage_readpage(page, exfat_get_block);
 365 }
 366
 367 static void exfat_readahead(struct readahead_control *rac)
 368 {
 369         mpage_readahead(rac, exfat_get_block);
 370 }
 371
 372 static int exfat_writepage(struct page *page, struct writeback_control *wbc)
 373 {
 374         return block_write_full_page(page, exfat_get_block, wbc);
 375 }
 376
 377 static int exfat_writepages(struct address_space *mapping,
 378                 struct writeback_control *wbc)
 379 {
 380         return mpage_writepages(mapping, wbc, exfat_get_block);
 381 }
 382
 383 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 384 {
 385         struct inode *inode = mapping->host;
 386
 387         if (to > i_size_read(inode)) {
 388                 truncate_pagecache(inode, i_size_read(inode));
 389                 exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
 390         }
 391 }
 392
 393 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 394                 loff_t pos, unsigned int len, unsigned int flags,
 395                 struct page **pagep, void **fsdata)
 396 {
 397         int ret;
 398
 399         *pagep = NULL;
 400         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 401                                exfat_get_block,
 402                                &EXFAT_I(mapping->host)->i_size_ondisk);
 403
 404         if (ret < 0)
 405                 exfat_write_failed(mapping, pos+len);
 406
 407         return ret;
 408 }
 409
 410 static int exfat_write_end(struct file *file, struct address_space *mapping,
 411                 loff_t pos, unsigned int len, unsigned int copied,
 412                 struct page *pagep, void *fsdata)
 413 {
 414         struct inode *inode = mapping->host;
 415         struct exfat_inode_info *ei = EXFAT_I(inode);
 416         int err;
 417
 418         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 419
 420         if (EXFAT_I(inode)->i_size_aligned < i_size_read(inode)) {
 421                 exfat_fs_error(inode->i_sb,
 422                         "invalid size(size(%llu) > aligned(%llu)\n",
 423                         i_size_read(inode), EXFAT_I(inode)->i_size_aligned);
 424                 return -EIO;
 425         }
 426
 427         if (err < len)
 428                 exfat_write_failed(mapping, pos+len);
 429
 430         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 431                 inode->i_mtime = inode->i_ctime = current_time(inode);
 432                 ei->attr |= ATTR_ARCHIVE;
 433                 mark_inode_dirty(inode);
 434         }
 435
 436         return err;
 437 }
 438
 439 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 440 {
 441         struct address_space *mapping = iocb->ki_filp->f_mapping;
 442         struct inode *inode = mapping->host;
 443         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 444         int rw = iov_iter_rw(iter);
 445         ssize_t ret;
 446
 447         if (rw == WRITE) {
 448                 /*
 449                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 450                  * so we need to update the ->i_size_aligned to block boundary.
 451                  *
 452                  * But we must fill the remaining area or hole by nul for
 453                  * updating ->i_size_aligned
 454                  *
 455                  * Return 0, and fallback to normal buffered write.
 456                  */
 457                 if (EXFAT_I(inode)->i_size_aligned < size)
 458                         return 0;
 459         }
 460
 461         /*
 462          * Need to use the DIO_LOCKING for avoiding the race
 463          * condition of exfat_get_block() and ->truncate().
 464          */
 465         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 466         if (ret < 0 && (rw & WRITE))
 467                 exfat_write_failed(mapping, size);
 468         return ret;
 469 }
 470
 471 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 472 {
 473         sector_t blocknr;
 474
 475         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 476         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 477         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 478         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 479         return blocknr;
 480 }
 481
 482 /*
 483  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 484  * up to the end of the block which corresponds to `from'.
 485  * This is required during truncate to physically zeroout the tail end
 486  * of that block so it doesn't yield old data if the file is later grown.
 487  * Also, avoid causing failure from fsx for cases of "data past EOF"
 488  */
 489 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 490 {
 491         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 492 }
 493
 494 static const struct address_space_operations exfat_aops = {
 495         .readpage       = exfat_readpage,
 496         .readahead      = exfat_readahead,
 497         .writepage      = exfat_writepage,
 498         .writepages     = exfat_writepages,
 499         .write_begin    = exfat_write_begin,
 500         .write_end      = exfat_write_end,
 501         .direct_IO      = exfat_direct_IO,
 502         .bmap           = exfat_aop_bmap
 503 };
 504
 505 static inline unsigned long exfat_hash(loff_t i_pos)
 506 {
 507         return hash_32(i_pos, EXFAT_HASH_BITS);
 508 }
 509
 510 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 511 {
 512         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 513         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 514
 515         spin_lock(&sbi->inode_hash_lock);
 516         EXFAT_I(inode)->i_pos = i_pos;
 517         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 518         spin_unlock(&sbi->inode_hash_lock);
 519 }
 520
 521 void exfat_unhash_inode(struct inode *inode)
 522 {
 523         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 524
 525         spin_lock(&sbi->inode_hash_lock);
 526         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 527         EXFAT_I(inode)->i_pos = 0;
 528         spin_unlock(&sbi->inode_hash_lock);
 529 }
 530
 531 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 532 {
 533         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 534         struct exfat_inode_info *info;
 535         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 536         struct inode *inode = NULL;
 537
 538         spin_lock(&sbi->inode_hash_lock);
 539         hlist_for_each_entry(info, head, i_hash_fat) {
 540                 WARN_ON(info->vfs_inode.i_sb != sb);
 541
 542                 if (i_pos != info->i_pos)
 543                         continue;
 544                 inode = igrab(&info->vfs_inode);
 545                 if (inode)
 546                         break;
 547         }
 548         spin_unlock(&sbi->inode_hash_lock);
 549         return inode;
 550 }
 551
 552 /* doesn't deal with root inode */
 553 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 554 {
 555         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 556         struct exfat_inode_info *ei = EXFAT_I(inode);
 557         loff_t size = info->size;
 558
 559         memcpy(&ei->dir, &info->dir, sizeof(struct exfat_chain));
 560         ei->entry = info->entry;
 561         ei->attr = info->attr;
 562         ei->start_clu = info->start_clu;
 563         ei->flags = info->flags;
 564         ei->type = info->type;
 565
 566         ei->version = 0;
 567         ei->hint_stat.eidx = 0;
 568         ei->hint_stat.clu = info->start_clu;
 569         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 570         ei->rwoffset = 0;
 571         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 572         ei->i_pos = 0;
 573
 574         inode->i_uid = sbi->options.fs_uid;
 575         inode->i_gid = sbi->options.fs_gid;
 576         inode_inc_iversion(inode);
 577         inode->i_generation = prandom_u32();
 578
 579         if (info->attr & ATTR_SUBDIR) { /* directory */
 580                 inode->i_generation &= ~1;
 581                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 582                 inode->i_op = &exfat_dir_inode_operations;
 583                 inode->i_fop = &exfat_dir_operations;
 584                 set_nlink(inode, info->num_subdirs);
 585         } else { /* regular file */
 586                 inode->i_generation |= 1;
 587                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 588                 inode->i_op = &exfat_file_inode_operations;
 589                 inode->i_fop = &exfat_file_operations;
 590                 inode->i_mapping->a_ops = &exfat_aops;
 591                 inode->i_mapping->nrpages = 0;
 592         }
 593
 594         i_size_write(inode, size);
 595
 596         /* ondisk and aligned size should be aligned with block size */
 597         if (size & (inode->i_sb->s_blocksize - 1)) {
 598                 size |= (inode->i_sb->s_blocksize - 1);
 599                 size++;
 600         }
 601
 602         ei->i_size_aligned = size;
 603         ei->i_size_ondisk = size;
 604
 605         exfat_save_attr(inode, info->attr);
 606
 607         inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
 608                 ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
 609         inode->i_mtime = info->mtime;
 610         inode->i_ctime = info->mtime;
 611         ei->i_crtime = info->crtime;
 612         inode->i_atime = info->atime;
 613
 614         return 0;
 615 }
 616
 617 struct inode *exfat_build_inode(struct super_block *sb,
 618                 struct exfat_dir_entry *info, loff_t i_pos)
 619 {
 620         struct inode *inode;
 621         int err;
 622
 623         inode = exfat_iget(sb, i_pos);
 624         if (inode)
 625                 goto out;
 626         inode = new_inode(sb);
 627         if (!inode) {
 628                 inode = ERR_PTR(-ENOMEM);
 629                 goto out;
 630         }
 631         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 632         inode_set_iversion(inode, 1);
 633         err = exfat_fill_inode(inode, info);
 634         if (err) {
 635                 iput(inode);
 636                 inode = ERR_PTR(err);
 637                 goto out;
 638         }
 639         exfat_hash_inode(inode, i_pos);
 640         insert_inode_hash(inode);
 641 out:
 642         return inode;
 643 }
 644
 645 void exfat_evict_inode(struct inode *inode)
 646 {
 647         truncate_inode_pages(&inode->i_data, 0);
 648
 649         if (!inode->i_nlink) {
 650                 i_size_write(inode, 0);
 651                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 652                 __exfat_truncate(inode, 0);
 653                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 654         }
 655
 656         invalidate_inode_buffers(inode);
 657         clear_inode(inode);
 658         exfat_cache_inval_inode(inode);
 659         exfat_unhash_inode(inode);
 660 }