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         int ret = -EIO;
  23         unsigned long long on_disk_size;
  24         struct exfat_dentry *ep, *ep2;
  25         struct exfat_entry_set_cache *es = NULL;
  26         struct super_block *sb = inode->i_sb;
  27         struct exfat_sb_info *sbi = EXFAT_SB(sb);
  28         struct exfat_inode_info *ei = EXFAT_I(inode);
  29         bool is_dir = (ei->type == TYPE_DIR) ? true : false;
  30
  31         if (inode->i_ino == EXFAT_ROOT_INO)
  32                 return 0;
  33
  34         /*
  35          * If the indode is already unlinked, there is no need for updating it.
  36          */
  37         if (ei->dir.dir == DIR_DELETED)
  38                 return 0;
  39
  40         if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
  41                 return 0;
  42
  43         exfat_set_vol_flags(sb, VOL_DIRTY);
  44
  45         /* get the directory entry of given file or directory */
  46         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES,
  47                 &ep);
  48         if (!es)
  49                 return -EIO;
  50         ep2 = ep + 1;
  51
  52         ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
  53
  54         /* set FILE_INFO structure using the acquired struct exfat_dentry */
  55         exfat_set_entry_time(sbi, &ei->i_crtime,
  56                         &ep->dentry.file.create_tz,
  57                         &ep->dentry.file.create_time,
  58                         &ep->dentry.file.create_date,
  59                         &ep->dentry.file.create_time_ms);
  60         exfat_set_entry_time(sbi, &inode->i_mtime,
  61                         &ep->dentry.file.modify_tz,
  62                         &ep->dentry.file.modify_time,
  63                         &ep->dentry.file.modify_date,
  64                         &ep->dentry.file.modify_time_ms);
  65         exfat_set_entry_time(sbi, &inode->i_atime,
  66                         &ep->dentry.file.access_tz,
  67                         &ep->dentry.file.access_time,
  68                         &ep->dentry.file.access_date,
  69                         NULL);
  70
  71         /* File size should be zero if there is no cluster allocated */
  72         on_disk_size = i_size_read(inode);
  73
  74         if (ei->start_clu == EXFAT_EOF_CLUSTER)
  75                 on_disk_size = 0;
  76
  77         ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
  78         ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
  79
  80         ret = exfat_update_dir_chksum_with_entry_set(sb, es, sync);
  81         kfree(es);
  82         return ret;
  83 }
  84
  85 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
  86 {
  87         int ret;
  88
  89         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
  90         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
  91         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
  92
  93         return ret;
  94 }
  95
  96 void exfat_sync_inode(struct inode *inode)
  97 {
  98         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
  99         __exfat_write_inode(inode, 1);
 100 }
 101
 102 /*
 103  * Input: inode, (logical) clu_offset, target allocation area
 104  * Output: errcode, cluster number
 105  * *clu = (~0), if it's unable to allocate a new cluster
 106  */
 107 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 108                 unsigned int *clu, int create)
 109 {
 110         int ret, modified = false;
 111         unsigned int last_clu;
 112         struct exfat_chain new_clu;
 113         struct exfat_dentry *ep;
 114         struct exfat_entry_set_cache *es = NULL;
 115         struct super_block *sb = inode->i_sb;
 116         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 117         struct exfat_inode_info *ei = EXFAT_I(inode);
 118         unsigned int local_clu_offset = clu_offset;
 119         unsigned int num_to_be_allocated = 0, num_clusters = 0;
 120
 121         ei->rwoffset = EXFAT_CLU_TO_B(clu_offset, sbi);
 122
 123         if (EXFAT_I(inode)->i_size_ondisk > 0)
 124                 num_clusters =
 125                         EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk,
 126                         sbi);
 127
 128         if (clu_offset >= num_clusters)
 129                 num_to_be_allocated = clu_offset - num_clusters + 1;
 130
 131         if (!create && (num_to_be_allocated > 0)) {
 132                 *clu = EXFAT_EOF_CLUSTER;
 133                 return 0;
 134         }
 135
 136         *clu = last_clu = ei->start_clu;
 137
 138         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 139                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 140                         last_clu += clu_offset - 1;
 141
 142                         if (clu_offset == num_clusters)
 143                                 *clu = EXFAT_EOF_CLUSTER;
 144                         else
 145                                 *clu += clu_offset;
 146                 }
 147         } else if (ei->type == TYPE_FILE) {
 148                 unsigned int fclus = 0;
 149                 int err = exfat_get_cluster(inode, clu_offset,
 150                                 &fclus, clu, &last_clu, 1);
 151                 if (err)
 152                         return -EIO;
 153
 154                 clu_offset -= fclus;
 155         } else {
 156                 /* hint information */
 157                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
 158                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
 159                         clu_offset -= ei->hint_bmap.off;
 160                         /* hint_bmap.clu should be valid */
 161                         WARN_ON(ei->hint_bmap.clu < 2);
 162                         *clu = ei->hint_bmap.clu;
 163                 }
 164
 165                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 166                         last_clu = *clu;
 167                         if (exfat_get_next_cluster(sb, clu))
 168                                 return -EIO;
 169                         clu_offset--;
 170                 }
 171         }
 172
 173         if (*clu == EXFAT_EOF_CLUSTER) {
 174                 exfat_set_vol_flags(sb, VOL_DIRTY);
 175
 176                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 177                                 EXFAT_EOF_CLUSTER : last_clu + 1;
 178                 new_clu.size = 0;
 179                 new_clu.flags = ei->flags;
 180
 181                 /* allocate a cluster */
 182                 if (num_to_be_allocated < 1) {
 183                         /* Broken FAT (i_sze > allocated FAT) */
 184                         exfat_fs_error(sb, "broken FAT chain.");
 185                         return -EIO;
 186                 }
 187
 188                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu);
 189                 if (ret)
 190                         return ret;
 191
 192                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
 193                     new_clu.dir == EXFAT_FREE_CLUSTER) {
 194                         exfat_fs_error(sb,
 195                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
 196                                 last_clu, new_clu.dir);
 197                         return -EIO;
 198                 }
 199
 200                 /* append to the FAT chain */
 201                 if (last_clu == EXFAT_EOF_CLUSTER) {
 202                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 203                                 ei->flags = ALLOC_FAT_CHAIN;
 204                         ei->start_clu = new_clu.dir;
 205                         modified = true;
 206                 } else {
 207                         if (new_clu.flags != ei->flags) {
 208                                 /* no-fat-chain bit is disabled,
 209                                  * so fat-chain should be synced with
 210                                  * alloc-bitmap
 211                                  */
 212                                 exfat_chain_cont_cluster(sb, ei->start_clu,
 213                                         num_clusters);
 214                                 ei->flags = ALLOC_FAT_CHAIN;
 215                                 modified = true;
 216                         }
 217                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 218                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 219                                         return -EIO;
 220                 }
 221
 222                 num_clusters += num_to_be_allocated;
 223                 *clu = new_clu.dir;
 224
 225                 if (ei->dir.dir != DIR_DELETED) {
 226                         es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
 227                                 ES_ALL_ENTRIES, &ep);
 228                         if (!es)
 229                                 return -EIO;
 230                         /* get stream entry */
 231                         ep++;
 232
 233                         /* update directory entry */
 234                         if (modified) {
 235                                 if (ep->dentry.stream.flags != ei->flags)
 236                                         ep->dentry.stream.flags = ei->flags;
 237
 238                                 if (le32_to_cpu(ep->dentry.stream.start_clu) !=
 239                                                 ei->start_clu)
 240                                         ep->dentry.stream.start_clu =
 241                                                 cpu_to_le32(ei->start_clu);
 242
 243                                 ep->dentry.stream.valid_size =
 244                                         cpu_to_le64(i_size_read(inode));
 245                                 ep->dentry.stream.size =
 246                                         ep->dentry.stream.valid_size;
 247                         }
 248
 249                         if (exfat_update_dir_chksum_with_entry_set(sb, es,
 250                             inode_needs_sync(inode)))
 251                                 return -EIO;
 252                         kfree(es);
 253
 254                 } /* end of if != DIR_DELETED */
 255
 256                 inode->i_blocks +=
 257                         num_to_be_allocated << sbi->sect_per_clus_bits;
 258
 259                 /*
 260                  * Move *clu pointer along FAT chains (hole care) because the
 261                  * caller of this function expect *clu to be the last cluster.
 262                  * This only works when num_to_be_allocated >= 2,
 263                  * *clu = (the first cluster of the allocated chain) =>
 264                  * (the last cluster of ...)
 265                  */
 266                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 267                         *clu += num_to_be_allocated - 1;
 268                 } else {
 269                         while (num_to_be_allocated > 1) {
 270                                 if (exfat_get_next_cluster(sb, clu))
 271                                         return -EIO;
 272                                 num_to_be_allocated--;
 273                         }
 274                 }
 275
 276         }
 277
 278         /* hint information */
 279         ei->hint_bmap.off = local_clu_offset;
 280         ei->hint_bmap.clu = *clu;
 281
 282         return 0;
 283 }
 284
 285 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 286                 struct buffer_head *bh, loff_t pos)
 287 {
 288         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 289                 return -EIO;
 290         set_buffer_new(bh);
 291
 292         /*
 293          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 294          */
 295         if (ei->i_size_ondisk > ei->i_size_aligned)
 296                 ei->i_size_aligned = ei->i_size_ondisk;
 297         return 0;
 298 }
 299
 300 static int exfat_get_block(struct inode *inode, sector_t iblock,
 301                 struct buffer_head *bh_result, int create)
 302 {
 303         struct exfat_inode_info *ei = EXFAT_I(inode);
 304         struct super_block *sb = inode->i_sb;
 305         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 306         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 307         int err = 0;
 308         unsigned long mapped_blocks = 0;
 309         unsigned int cluster, sec_offset;
 310         sector_t last_block;
 311         sector_t phys = 0;
 312         loff_t pos;
 313
 314         mutex_lock(&sbi->s_lock);
 315         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 316         if (iblock >= last_block && !create)
 317                 goto done;
 318
 319         /* Is this block already allocated? */
 320         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 321                         &cluster, create);
 322         if (err) {
 323                 if (err != -ENOSPC)
 324                         exfat_fs_error_ratelimit(sb,
 325                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 326                                 inode, (unsigned long long)iblock, err);
 327                 goto unlock_ret;
 328         }
 329
 330         if (cluster == EXFAT_EOF_CLUSTER)
 331                 goto done;
 332
 333         /* sector offset in cluster */
 334         sec_offset = iblock & (sbi->sect_per_clus - 1);
 335
 336         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 337         mapped_blocks = sbi->sect_per_clus - sec_offset;
 338         max_blocks = min(mapped_blocks, max_blocks);
 339
 340         /* Treat newly added block / cluster */
 341         if (iblock < last_block)
 342                 create = 0;
 343
 344         if (create || buffer_delay(bh_result)) {
 345                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 346                 if (ei->i_size_ondisk < pos)
 347                         ei->i_size_ondisk = pos;
 348         }
 349
 350         if (create) {
 351                 err = exfat_map_new_buffer(ei, bh_result, pos);
 352                 if (err) {
 353                         exfat_fs_error(sb,
 354                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 355                                         pos, ei->i_size_aligned);
 356                         goto unlock_ret;
 357                 }
 358         }
 359
 360         if (buffer_delay(bh_result))
 361                 clear_buffer_delay(bh_result);
 362         map_bh(bh_result, sb, phys);
 363 done:
 364         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 365 unlock_ret:
 366         mutex_unlock(&sbi->s_lock);
 367         return err;
 368 }
 369
 370 static int exfat_readpage(struct file *file, struct page *page)
 371 {
 372         return mpage_readpage(page, exfat_get_block);
 373 }
 374
 375 static int exfat_readpages(struct file *file, struct address_space *mapping,
 376                 struct list_head *pages, unsigned int nr_pages)
 377 {
 378         return mpage_readpages(mapping, pages, nr_pages, exfat_get_block);
 379 }
 380
 381 static int exfat_writepage(struct page *page, struct writeback_control *wbc)
 382 {
 383         return block_write_full_page(page, exfat_get_block, wbc);
 384 }
 385
 386 static int exfat_writepages(struct address_space *mapping,
 387                 struct writeback_control *wbc)
 388 {
 389         return mpage_writepages(mapping, wbc, exfat_get_block);
 390 }
 391
 392 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 393 {
 394         struct inode *inode = mapping->host;
 395
 396         if (to > i_size_read(inode)) {
 397                 truncate_pagecache(inode, i_size_read(inode));
 398                 exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
 399         }
 400 }
 401
 402 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 403                 loff_t pos, unsigned int len, unsigned int flags,
 404                 struct page **pagep, void **fsdata)
 405 {
 406         int ret;
 407
 408         *pagep = NULL;
 409         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 410                                exfat_get_block,
 411                                &EXFAT_I(mapping->host)->i_size_ondisk);
 412
 413         if (ret < 0)
 414                 exfat_write_failed(mapping, pos+len);
 415
 416         return ret;
 417 }
 418
 419 static int exfat_write_end(struct file *file, struct address_space *mapping,
 420                 loff_t pos, unsigned int len, unsigned int copied,
 421                 struct page *pagep, void *fsdata)
 422 {
 423         struct inode *inode = mapping->host;
 424         struct exfat_inode_info *ei = EXFAT_I(inode);
 425         int err;
 426
 427         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 428
 429         if (EXFAT_I(inode)->i_size_aligned < i_size_read(inode)) {
 430                 exfat_fs_error(inode->i_sb,
 431                         "invalid size(size(%llu) > aligned(%llu)\n",
 432                         i_size_read(inode), EXFAT_I(inode)->i_size_aligned);
 433                 return -EIO;
 434         }
 435
 436         if (err < len)
 437                 exfat_write_failed(mapping, pos+len);
 438
 439         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 440                 inode->i_mtime = inode->i_ctime = current_time(inode);
 441                 ei->attr |= ATTR_ARCHIVE;
 442                 mark_inode_dirty(inode);
 443         }
 444
 445         return err;
 446 }
 447
 448 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 449 {
 450         struct address_space *mapping = iocb->ki_filp->f_mapping;
 451         struct inode *inode = mapping->host;
 452         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 453         int rw = iov_iter_rw(iter);
 454         ssize_t ret;
 455
 456         if (rw == WRITE) {
 457                 /*
 458                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 459                  * so we need to update the ->i_size_aligned to block boundary.
 460                  *
 461                  * But we must fill the remaining area or hole by nul for
 462                  * updating ->i_size_aligned
 463                  *
 464                  * Return 0, and fallback to normal buffered write.
 465                  */
 466                 if (EXFAT_I(inode)->i_size_aligned < size)
 467                         return 0;
 468         }
 469
 470         /*
 471          * Need to use the DIO_LOCKING for avoiding the race
 472          * condition of exfat_get_block() and ->truncate().
 473          */
 474         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 475         if (ret < 0 && (rw & WRITE))
 476                 exfat_write_failed(mapping, size);
 477         return ret;
 478 }
 479
 480 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 481 {
 482         sector_t blocknr;
 483
 484         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 485         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 486         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 487         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 488         return blocknr;
 489 }
 490
 491 /*
 492  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 493  * up to the end of the block which corresponds to `from'.
 494  * This is required during truncate to physically zeroout the tail end
 495  * of that block so it doesn't yield old data if the file is later grown.
 496  * Also, avoid causing failure from fsx for cases of "data past EOF"
 497  */
 498 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 499 {
 500         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 501 }
 502
 503 static const struct address_space_operations exfat_aops = {
 504         .readpage       = exfat_readpage,
 505         .readpages      = exfat_readpages,
 506         .writepage      = exfat_writepage,
 507         .writepages     = exfat_writepages,
 508         .write_begin    = exfat_write_begin,
 509         .write_end      = exfat_write_end,
 510         .direct_IO      = exfat_direct_IO,
 511         .bmap           = exfat_aop_bmap
 512 };
 513
 514 static inline unsigned long exfat_hash(loff_t i_pos)
 515 {
 516         return hash_32(i_pos, EXFAT_HASH_BITS);
 517 }
 518
 519 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 520 {
 521         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 522         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 523
 524         spin_lock(&sbi->inode_hash_lock);
 525         EXFAT_I(inode)->i_pos = i_pos;
 526         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 527         spin_unlock(&sbi->inode_hash_lock);
 528 }
 529
 530 void exfat_unhash_inode(struct inode *inode)
 531 {
 532         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 533
 534         spin_lock(&sbi->inode_hash_lock);
 535         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 536         EXFAT_I(inode)->i_pos = 0;
 537         spin_unlock(&sbi->inode_hash_lock);
 538 }
 539
 540 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 541 {
 542         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 543         struct exfat_inode_info *info;
 544         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 545         struct inode *inode = NULL;
 546
 547         spin_lock(&sbi->inode_hash_lock);
 548         hlist_for_each_entry(info, head, i_hash_fat) {
 549                 WARN_ON(info->vfs_inode.i_sb != sb);
 550
 551                 if (i_pos != info->i_pos)
 552                         continue;
 553                 inode = igrab(&info->vfs_inode);
 554                 if (inode)
 555                         break;
 556         }
 557         spin_unlock(&sbi->inode_hash_lock);
 558         return inode;
 559 }
 560
 561 /* doesn't deal with root inode */
 562 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 563 {
 564         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 565         struct exfat_inode_info *ei = EXFAT_I(inode);
 566         loff_t size = info->size;
 567
 568         memcpy(&ei->dir, &info->dir, sizeof(struct exfat_chain));
 569         ei->entry = info->entry;
 570         ei->attr = info->attr;
 571         ei->start_clu = info->start_clu;
 572         ei->flags = info->flags;
 573         ei->type = info->type;
 574
 575         ei->version = 0;
 576         ei->hint_stat.eidx = 0;
 577         ei->hint_stat.clu = info->start_clu;
 578         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 579         ei->rwoffset = 0;
 580         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 581         ei->i_pos = 0;
 582
 583         inode->i_uid = sbi->options.fs_uid;
 584         inode->i_gid = sbi->options.fs_gid;
 585         inode_inc_iversion(inode);
 586         inode->i_generation = prandom_u32();
 587
 588         if (info->attr & ATTR_SUBDIR) { /* directory */
 589                 inode->i_generation &= ~1;
 590                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 591                 inode->i_op = &exfat_dir_inode_operations;
 592                 inode->i_fop = &exfat_dir_operations;
 593                 set_nlink(inode, info->num_subdirs);
 594         } else { /* regular file */
 595                 inode->i_generation |= 1;
 596                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 597                 inode->i_op = &exfat_file_inode_operations;
 598                 inode->i_fop = &exfat_file_operations;
 599                 inode->i_mapping->a_ops = &exfat_aops;
 600                 inode->i_mapping->nrpages = 0;
 601         }
 602
 603         i_size_write(inode, size);
 604
 605         /* ondisk and aligned size should be aligned with block size */
 606         if (size & (inode->i_sb->s_blocksize - 1)) {
 607                 size |= (inode->i_sb->s_blocksize - 1);
 608                 size++;
 609         }
 610
 611         ei->i_size_aligned = size;
 612         ei->i_size_ondisk = size;
 613
 614         exfat_save_attr(inode, info->attr);
 615
 616         inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) &
 617                 ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
 618         inode->i_mtime = info->mtime;
 619         inode->i_ctime = info->mtime;
 620         ei->i_crtime = info->crtime;
 621         inode->i_atime = info->atime;
 622
 623         exfat_cache_init_inode(inode);
 624
 625         return 0;
 626 }
 627
 628 struct inode *exfat_build_inode(struct super_block *sb,
 629                 struct exfat_dir_entry *info, loff_t i_pos)
 630 {
 631         struct inode *inode;
 632         int err;
 633
 634         inode = exfat_iget(sb, i_pos);
 635         if (inode)
 636                 goto out;
 637         inode = new_inode(sb);
 638         if (!inode) {
 639                 inode = ERR_PTR(-ENOMEM);
 640                 goto out;
 641         }
 642         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 643         inode_set_iversion(inode, 1);
 644         err = exfat_fill_inode(inode, info);
 645         if (err) {
 646                 iput(inode);
 647                 inode = ERR_PTR(err);
 648                 goto out;
 649         }
 650         exfat_hash_inode(inode, i_pos);
 651         insert_inode_hash(inode);
 652 out:
 653         return inode;
 654 }
 655
 656 void exfat_evict_inode(struct inode *inode)
 657 {
 658         truncate_inode_pages(&inode->i_data, 0);
 659
 660         if (!inode->i_nlink) {
 661                 i_size_write(inode, 0);
 662                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 663                 __exfat_truncate(inode, 0);
 664                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 665         }
 666
 667         invalidate_inode_buffers(inode);
 668         clear_inode(inode);
 669         exfat_cache_inval_inode(inode);
 670         exfat_unhash_inode(inode);
 671 }