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 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;
  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         struct timespec64 ts;
  30
  31         if (inode->i_ino == EXFAT_ROOT_INO)
  32                 return 0;
  33
  34         /*
  35          * If the inode 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_volume_dirty(sb);
  44
  45         /* get the directory entry of given file or directory */
  46         if (exfat_get_dentry_set_by_ei(&es, sb, ei))
  47                 return -EIO;
  48         ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
  49         ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
  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         ts = inode_get_mtime(inode);
  60         exfat_set_entry_time(sbi, &ts,
  61                              &ep->dentry.file.modify_tz,
  62                              &ep->dentry.file.modify_time,
  63                              &ep->dentry.file.modify_date,
  64                              &ep->dentry.file.modify_time_cs);
  65         ts = inode_get_atime(inode);
  66         exfat_set_entry_time(sbi, &ts,
  67                              &ep->dentry.file.access_tz,
  68                              &ep->dentry.file.access_time,
  69                              &ep->dentry.file.access_date,
  70                              NULL);
  71
  72         /* File size should be zero if there is no cluster allocated */
  73         on_disk_size = i_size_read(inode);
  74
  75         if (ei->start_clu == EXFAT_EOF_CLUSTER)
  76                 on_disk_size = 0;
  77
  78         ep2->dentry.stream.size = cpu_to_le64(on_disk_size);
  79         /*
  80          * mmap write does not use exfat_write_end(), valid_size may be
  81          * extended to the sector-aligned length in exfat_get_block().
  82          * So we need to fixup valid_size to the writren length.
  83          */
  84         if (on_disk_size < ei->valid_size)
  85                 ep2->dentry.stream.valid_size = ep2->dentry.stream.size;
  86         else
  87                 ep2->dentry.stream.valid_size = cpu_to_le64(ei->valid_size);
  88
  89         if (on_disk_size) {
  90                 ep2->dentry.stream.flags = ei->flags;
  91                 ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu);
  92         } else {
  93                 ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
  94                 ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
  95         }
  96
  97         exfat_update_dir_chksum(&es);
  98         return exfat_put_dentry_set(&es, sync);
  99 }
 100
 101 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
 102 {
 103         int ret;
 104
 105         if (unlikely(exfat_forced_shutdown(inode->i_sb)))
 106                 return -EIO;
 107
 108         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 109         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
 110         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 111
 112         return ret;
 113 }
 114
 115 void exfat_sync_inode(struct inode *inode)
 116 {
 117         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
 118         __exfat_write_inode(inode, 1);
 119 }
 120
 121 /*
 122  * Input: inode, (logical) clu_offset, target allocation area
 123  * Output: errcode, cluster number
 124  * *clu = (~0), if it's unable to allocate a new cluster
 125  */
 126 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 127                 unsigned int *clu, int create)
 128 {
 129         int ret;
 130         unsigned int last_clu;
 131         struct exfat_chain new_clu;
 132         struct super_block *sb = inode->i_sb;
 133         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 134         struct exfat_inode_info *ei = EXFAT_I(inode);
 135         unsigned int local_clu_offset = clu_offset;
 136         unsigned int num_to_be_allocated = 0, num_clusters;
 137
 138         num_clusters = EXFAT_B_TO_CLU(exfat_ondisk_size(inode), sbi);
 139
 140         if (clu_offset >= num_clusters)
 141                 num_to_be_allocated = clu_offset - num_clusters + 1;
 142
 143         if (!create && (num_to_be_allocated > 0)) {
 144                 *clu = EXFAT_EOF_CLUSTER;
 145                 return 0;
 146         }
 147
 148         *clu = last_clu = ei->start_clu;
 149
 150         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 151                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 152                         last_clu += clu_offset - 1;
 153
 154                         if (clu_offset == num_clusters)
 155                                 *clu = EXFAT_EOF_CLUSTER;
 156                         else
 157                                 *clu += clu_offset;
 158                 }
 159         } else if (ei->type == TYPE_FILE) {
 160                 unsigned int fclus = 0;
 161                 int err = exfat_get_cluster(inode, clu_offset,
 162                                 &fclus, clu, &last_clu, 1);
 163                 if (err)
 164                         return -EIO;
 165
 166                 clu_offset -= fclus;
 167         } else {
 168                 /* hint information */
 169                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
 170                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
 171                         clu_offset -= ei->hint_bmap.off;
 172                         /* hint_bmap.clu should be valid */
 173                         WARN_ON(ei->hint_bmap.clu < 2);
 174                         *clu = ei->hint_bmap.clu;
 175                 }
 176
 177                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 178                         last_clu = *clu;
 179                         if (exfat_get_next_cluster(sb, clu))
 180                                 return -EIO;
 181                         clu_offset--;
 182                 }
 183         }
 184
 185         if (*clu == EXFAT_EOF_CLUSTER) {
 186                 exfat_set_volume_dirty(sb);
 187
 188                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 189                                 EXFAT_EOF_CLUSTER : last_clu + 1;
 190                 new_clu.size = 0;
 191                 new_clu.flags = ei->flags;
 192
 193                 /* allocate a cluster */
 194                 if (num_to_be_allocated < 1) {
 195                         /* Broken FAT (i_sze > allocated FAT) */
 196                         exfat_fs_error(sb, "broken FAT chain.");
 197                         return -EIO;
 198                 }
 199
 200                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
 201                                 inode_needs_sync(inode));
 202                 if (ret)
 203                         return ret;
 204
 205                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
 206                     new_clu.dir == EXFAT_FREE_CLUSTER) {
 207                         exfat_fs_error(sb,
 208                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
 209                                 last_clu, new_clu.dir);
 210                         return -EIO;
 211                 }
 212
 213                 /* append to the FAT chain */
 214                 if (last_clu == EXFAT_EOF_CLUSTER) {
 215                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 216                                 ei->flags = ALLOC_FAT_CHAIN;
 217                         ei->start_clu = new_clu.dir;
 218                 } else {
 219                         if (new_clu.flags != ei->flags) {
 220                                 /* no-fat-chain bit is disabled,
 221                                  * so fat-chain should be synced with
 222                                  * alloc-bitmap
 223                                  */
 224                                 exfat_chain_cont_cluster(sb, ei->start_clu,
 225                                         num_clusters);
 226                                 ei->flags = ALLOC_FAT_CHAIN;
 227                         }
 228                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 229                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 230                                         return -EIO;
 231                 }
 232
 233                 num_clusters += num_to_be_allocated;
 234                 *clu = new_clu.dir;
 235
 236                 inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
 237
 238                 /*
 239                  * Move *clu pointer along FAT chains (hole care) because the
 240                  * caller of this function expect *clu to be the last cluster.
 241                  * This only works when num_to_be_allocated >= 2,
 242                  * *clu = (the first cluster of the allocated chain) =>
 243                  * (the last cluster of ...)
 244                  */
 245                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 246                         *clu += num_to_be_allocated - 1;
 247                 } else {
 248                         while (num_to_be_allocated > 1) {
 249                                 if (exfat_get_next_cluster(sb, clu))
 250                                         return -EIO;
 251                                 num_to_be_allocated--;
 252                         }
 253                 }
 254
 255         }
 256
 257         /* hint information */
 258         ei->hint_bmap.off = local_clu_offset;
 259         ei->hint_bmap.clu = *clu;
 260
 261         return 0;
 262 }
 263
 264 static int exfat_get_block(struct inode *inode, sector_t iblock,
 265                 struct buffer_head *bh_result, int create)
 266 {
 267         struct exfat_inode_info *ei = EXFAT_I(inode);
 268         struct super_block *sb = inode->i_sb;
 269         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 270         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 271         int err = 0;
 272         unsigned long mapped_blocks = 0;
 273         unsigned int cluster, sec_offset;
 274         sector_t last_block;
 275         sector_t phys = 0;
 276         sector_t valid_blks;
 277
 278         mutex_lock(&sbi->s_lock);
 279         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 280         if (iblock >= last_block && !create)
 281                 goto done;
 282
 283         /* Is this block already allocated? */
 284         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 285                         &cluster, create);
 286         if (err) {
 287                 if (err != -ENOSPC)
 288                         exfat_fs_error_ratelimit(sb,
 289                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 290                                 inode, (unsigned long long)iblock, err);
 291                 goto unlock_ret;
 292         }
 293
 294         if (cluster == EXFAT_EOF_CLUSTER)
 295                 goto done;
 296
 297         /* sector offset in cluster */
 298         sec_offset = iblock & (sbi->sect_per_clus - 1);
 299
 300         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 301         mapped_blocks = sbi->sect_per_clus - sec_offset;
 302         max_blocks = min(mapped_blocks, max_blocks);
 303
 304         map_bh(bh_result, sb, phys);
 305         if (buffer_delay(bh_result))
 306                 clear_buffer_delay(bh_result);
 307
 308         if (create) {
 309                 valid_blks = EXFAT_B_TO_BLK_ROUND_UP(ei->valid_size, sb);
 310
 311                 if (iblock + max_blocks < valid_blks) {
 312                         /* The range has been written, map it */
 313                         goto done;
 314                 } else if (iblock < valid_blks) {
 315                         /*
 316                          * The range has been partially written,
 317                          * map the written part.
 318                          */
 319                         max_blocks = valid_blks - iblock;
 320                         goto done;
 321                 }
 322
 323                 /* The area has not been written, map and mark as new. */
 324                 set_buffer_new(bh_result);
 325
 326                 ei->valid_size = EXFAT_BLK_TO_B(iblock + max_blocks, sb);
 327                 mark_inode_dirty(inode);
 328         } else {
 329                 valid_blks = EXFAT_B_TO_BLK(ei->valid_size, sb);
 330
 331                 if (iblock + max_blocks < valid_blks) {
 332                         /* The range has been written, map it */
 333                         goto done;
 334                 } else if (iblock < valid_blks) {
 335                         /*
 336                          * The area has been partially written,
 337                          * map the written part.
 338                          */
 339                         max_blocks = valid_blks - iblock;
 340                         goto done;
 341                 } else if (iblock == valid_blks &&
 342                            (ei->valid_size & (sb->s_blocksize - 1))) {
 343                         /*
 344                          * The block has been partially written,
 345                          * zero the unwritten part and map the block.
 346                          */
 347                         loff_t size, off, pos;
 348
 349                         max_blocks = 1;
 350
 351                         /*
 352                          * For direct read, the unwritten part will be zeroed in
 353                          * exfat_direct_IO()
 354                          */
 355                         if (!bh_result->b_folio)
 356                                 goto done;
 357
 358                         pos = EXFAT_BLK_TO_B(iblock, sb);
 359                         size = ei->valid_size - pos;
 360                         off = pos & (PAGE_SIZE - 1);
 361
 362                         folio_set_bh(bh_result, bh_result->b_folio, off);
 363                         err = bh_read(bh_result, 0);
 364                         if (err < 0)
 365                                 goto unlock_ret;
 366
 367                         folio_zero_segment(bh_result->b_folio, off + size,
 368                                         off + sb->s_blocksize);
 369                 } else {
 370                         /*
 371                          * The range has not been written, clear the mapped flag
 372                          * to only zero the cache and do not read from disk.
 373                          */
 374                         clear_buffer_mapped(bh_result);
 375                 }
 376         }
 377 done:
 378         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 379 unlock_ret:
 380         mutex_unlock(&sbi->s_lock);
 381         return err;
 382 }
 383
 384 static int exfat_read_folio(struct file *file, struct folio *folio)
 385 {
 386         return mpage_read_folio(folio, exfat_get_block);
 387 }
 388
 389 static void exfat_readahead(struct readahead_control *rac)
 390 {
 391         struct address_space *mapping = rac->mapping;
 392         struct inode *inode = mapping->host;
 393         struct exfat_inode_info *ei = EXFAT_I(inode);
 394         loff_t pos = readahead_pos(rac);
 395
 396         /* Range cross valid_size, read it page by page. */
 397         if (ei->valid_size < i_size_read(inode) &&
 398             pos <= ei->valid_size &&
 399             ei->valid_size < pos + readahead_length(rac))
 400                 return;
 401
 402         mpage_readahead(rac, exfat_get_block);
 403 }
 404
 405 static int exfat_writepages(struct address_space *mapping,
 406                 struct writeback_control *wbc)
 407 {
 408         if (unlikely(exfat_forced_shutdown(mapping->host->i_sb)))
 409                 return -EIO;
 410
 411         return mpage_writepages(mapping, wbc, exfat_get_block);
 412 }
 413
 414 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 415 {
 416         struct inode *inode = mapping->host;
 417
 418         if (to > i_size_read(inode)) {
 419                 truncate_pagecache(inode, i_size_read(inode));
 420                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 421                 exfat_truncate(inode);
 422         }
 423 }
 424
 425 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 426                 loff_t pos, unsigned int len,
 427                 struct folio **foliop, void **fsdata)
 428 {
 429         int ret;
 430
 431         if (unlikely(exfat_forced_shutdown(mapping->host->i_sb)))
 432                 return -EIO;
 433
 434         ret = block_write_begin(mapping, pos, len, foliop, exfat_get_block);
 435
 436         if (ret < 0)
 437                 exfat_write_failed(mapping, pos+len);
 438
 439         return ret;
 440 }
 441
 442 static int exfat_write_end(struct file *file, struct address_space *mapping,
 443                 loff_t pos, unsigned int len, unsigned int copied,
 444                 struct folio *folio, void *fsdata)
 445 {
 446         struct inode *inode = mapping->host;
 447         struct exfat_inode_info *ei = EXFAT_I(inode);
 448         int err;
 449
 450         err = generic_write_end(file, mapping, pos, len, copied, folio, fsdata);
 451         if (err < len)
 452                 exfat_write_failed(mapping, pos+len);
 453
 454         if (!(err < 0) && pos + err > ei->valid_size) {
 455                 ei->valid_size = pos + err;
 456                 mark_inode_dirty(inode);
 457         }
 458
 459         if (!(err < 0) && !(ei->attr & EXFAT_ATTR_ARCHIVE)) {
 460                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 461                 ei->attr |= EXFAT_ATTR_ARCHIVE;
 462                 mark_inode_dirty(inode);
 463         }
 464
 465         return err;
 466 }
 467
 468 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 469 {
 470         struct address_space *mapping = iocb->ki_filp->f_mapping;
 471         struct inode *inode = mapping->host;
 472         struct exfat_inode_info *ei = EXFAT_I(inode);
 473         loff_t pos = iocb->ki_pos;
 474         loff_t size = pos + iov_iter_count(iter);
 475         int rw = iov_iter_rw(iter);
 476         ssize_t ret;
 477
 478         /*
 479          * Need to use the DIO_LOCKING for avoiding the race
 480          * condition of exfat_get_block() and ->truncate().
 481          */
 482         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 483         if (ret < 0) {
 484                 if (rw == WRITE && ret != -EIOCBQUEUED)
 485                         exfat_write_failed(mapping, size);
 486
 487                 return ret;
 488         } else
 489                 size = pos + ret;
 490
 491         if (rw == WRITE) {
 492                 /*
 493                  * If the block had been partially written before this write,
 494                  * ->valid_size will not be updated in exfat_get_block(),
 495                  * update it here.
 496                  */
 497                 if (ei->valid_size < size) {
 498                         ei->valid_size = size;
 499                         mark_inode_dirty(inode);
 500                 }
 501         } else if (pos < ei->valid_size && ei->valid_size < size) {
 502                 /* zero the unwritten part in the partially written block */
 503                 iov_iter_revert(iter, size - ei->valid_size);
 504                 iov_iter_zero(size - ei->valid_size, iter);
 505         }
 506
 507         return ret;
 508 }
 509
 510 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 511 {
 512         sector_t blocknr;
 513
 514         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 515         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 516         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 517         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 518         return blocknr;
 519 }
 520
 521 /*
 522  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 523  * up to the end of the block which corresponds to `from'.
 524  * This is required during truncate to physically zeroout the tail end
 525  * of that block so it doesn't yield old data if the file is later grown.
 526  * Also, avoid causing failure from fsx for cases of "data past EOF"
 527  */
 528 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 529 {
 530         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 531 }
 532
 533 static const struct address_space_operations exfat_aops = {
 534         .dirty_folio    = block_dirty_folio,
 535         .invalidate_folio = block_invalidate_folio,
 536         .read_folio     = exfat_read_folio,
 537         .readahead      = exfat_readahead,
 538         .writepages     = exfat_writepages,
 539         .write_begin    = exfat_write_begin,
 540         .write_end      = exfat_write_end,
 541         .direct_IO      = exfat_direct_IO,
 542         .bmap           = exfat_aop_bmap,
 543         .migrate_folio  = buffer_migrate_folio,
 544 };
 545
 546 static inline unsigned long exfat_hash(loff_t i_pos)
 547 {
 548         return hash_32(i_pos, EXFAT_HASH_BITS);
 549 }
 550
 551 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 552 {
 553         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 554         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 555
 556         spin_lock(&sbi->inode_hash_lock);
 557         EXFAT_I(inode)->i_pos = i_pos;
 558         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 559         spin_unlock(&sbi->inode_hash_lock);
 560 }
 561
 562 void exfat_unhash_inode(struct inode *inode)
 563 {
 564         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 565
 566         spin_lock(&sbi->inode_hash_lock);
 567         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 568         EXFAT_I(inode)->i_pos = 0;
 569         spin_unlock(&sbi->inode_hash_lock);
 570 }
 571
 572 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 573 {
 574         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 575         struct exfat_inode_info *info;
 576         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 577         struct inode *inode = NULL;
 578
 579         spin_lock(&sbi->inode_hash_lock);
 580         hlist_for_each_entry(info, head, i_hash_fat) {
 581                 WARN_ON(info->vfs_inode.i_sb != sb);
 582
 583                 if (i_pos != info->i_pos)
 584                         continue;
 585                 inode = igrab(&info->vfs_inode);
 586                 if (inode)
 587                         break;
 588         }
 589         spin_unlock(&sbi->inode_hash_lock);
 590         return inode;
 591 }
 592
 593 /* doesn't deal with root inode */
 594 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 595 {
 596         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 597         struct exfat_inode_info *ei = EXFAT_I(inode);
 598         loff_t size = info->size;
 599
 600         ei->dir = info->dir;
 601         ei->entry = info->entry;
 602         ei->attr = info->attr;
 603         ei->start_clu = info->start_clu;
 604         ei->flags = info->flags;
 605         ei->type = info->type;
 606         ei->valid_size = info->valid_size;
 607
 608         ei->version = 0;
 609         ei->hint_stat.eidx = 0;
 610         ei->hint_stat.clu = info->start_clu;
 611         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 612         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 613         ei->i_pos = 0;
 614
 615         inode->i_uid = sbi->options.fs_uid;
 616         inode->i_gid = sbi->options.fs_gid;
 617         inode_inc_iversion(inode);
 618         inode->i_generation = get_random_u32();
 619
 620         if (info->attr & EXFAT_ATTR_SUBDIR) { /* directory */
 621                 inode->i_generation &= ~1;
 622                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 623                 inode->i_op = &exfat_dir_inode_operations;
 624                 inode->i_fop = &exfat_dir_operations;
 625                 set_nlink(inode, info->num_subdirs);
 626         } else { /* regular file */
 627                 inode->i_generation |= 1;
 628                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 629                 inode->i_op = &exfat_file_inode_operations;
 630                 inode->i_fop = &exfat_file_operations;
 631                 inode->i_mapping->a_ops = &exfat_aops;
 632                 inode->i_mapping->nrpages = 0;
 633         }
 634
 635         i_size_write(inode, size);
 636
 637         exfat_save_attr(inode, info->attr);
 638
 639         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 640         inode_set_mtime_to_ts(inode, info->mtime);
 641         inode_set_ctime_to_ts(inode, info->mtime);
 642         ei->i_crtime = info->crtime;
 643         inode_set_atime_to_ts(inode, info->atime);
 644
 645         return 0;
 646 }
 647
 648 struct inode *exfat_build_inode(struct super_block *sb,
 649                 struct exfat_dir_entry *info, loff_t i_pos)
 650 {
 651         struct inode *inode;
 652         int err;
 653
 654         inode = exfat_iget(sb, i_pos);
 655         if (inode)
 656                 goto out;
 657         inode = new_inode(sb);
 658         if (!inode) {
 659                 inode = ERR_PTR(-ENOMEM);
 660                 goto out;
 661         }
 662         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 663         inode_set_iversion(inode, 1);
 664         err = exfat_fill_inode(inode, info);
 665         if (err) {
 666                 iput(inode);
 667                 inode = ERR_PTR(err);
 668                 goto out;
 669         }
 670         exfat_hash_inode(inode, i_pos);
 671         insert_inode_hash(inode);
 672 out:
 673         return inode;
 674 }
 675
 676 void exfat_evict_inode(struct inode *inode)
 677 {
 678         truncate_inode_pages(&inode->i_data, 0);
 679
 680         if (!inode->i_nlink) {
 681                 i_size_write(inode, 0);
 682                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 683                 __exfat_truncate(inode);
 684                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 685         }
 686
 687         invalidate_inode_buffers(inode);
 688         clear_inode(inode);
 689         exfat_cache_inval_inode(inode);
 690         exfat_unhash_inode(inode);
 691 }