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