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
  30         if (inode->i_ino == EXFAT_ROOT_INO)
  31                 return 0;
  32
  33         /*
  34          * If the inode 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         if (exfat_get_dentry_set(&es, sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES))
  46                 return -EIO;
  47         ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
  48         ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
  49
  50         ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
  51
  52         /* set FILE_INFO structure using the acquired struct exfat_dentry */
  53         exfat_set_entry_time(sbi, &ei->i_crtime,
  54                         &ep->dentry.file.create_tz,
  55                         &ep->dentry.file.create_time,
  56                         &ep->dentry.file.create_date,
  57                         &ep->dentry.file.create_time_cs);
  58         exfat_set_entry_time(sbi, &inode->i_mtime,
  59                         &ep->dentry.file.modify_tz,
  60                         &ep->dentry.file.modify_time,
  61                         &ep->dentry.file.modify_date,
  62                         &ep->dentry.file.modify_time_cs);
  63         exfat_set_entry_time(sbi, &inode->i_atime,
  64                         &ep->dentry.file.access_tz,
  65                         &ep->dentry.file.access_time,
  66                         &ep->dentry.file.access_date,
  67                         NULL);
  68
  69         /* File size should be zero if there is no cluster allocated */
  70         on_disk_size = i_size_read(inode);
  71
  72         if (ei->start_clu == EXFAT_EOF_CLUSTER)
  73                 on_disk_size = 0;
  74
  75         ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
  76         ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
  77         if (on_disk_size) {
  78                 ep2->dentry.stream.flags = ei->flags;
  79                 ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu);
  80         } else {
  81                 ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
  82                 ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
  83         }
  84
  85         exfat_update_dir_chksum_with_entry_set(&es);
  86         return exfat_put_dentry_set(&es, sync);
  87 }
  88
  89 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
  90 {
  91         int ret;
  92
  93         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
  94         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
  95         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
  96
  97         return ret;
  98 }
  99
 100 void exfat_sync_inode(struct inode *inode)
 101 {
 102         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
 103         __exfat_write_inode(inode, 1);
 104 }
 105
 106 /*
 107  * Input: inode, (logical) clu_offset, target allocation area
 108  * Output: errcode, cluster number
 109  * *clu = (~0), if it's unable to allocate a new cluster
 110  */
 111 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 112                 unsigned int *clu, int create)
 113 {
 114         int ret;
 115         unsigned int last_clu;
 116         struct exfat_chain new_clu;
 117         struct super_block *sb = inode->i_sb;
 118         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 119         struct exfat_inode_info *ei = EXFAT_I(inode);
 120         unsigned int local_clu_offset = clu_offset;
 121         unsigned int num_to_be_allocated = 0, num_clusters = 0;
 122
 123         if (ei->i_size_ondisk > 0)
 124                 num_clusters =
 125                         EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
 126
 127         if (clu_offset >= num_clusters)
 128                 num_to_be_allocated = clu_offset - num_clusters + 1;
 129
 130         if (!create && (num_to_be_allocated > 0)) {
 131                 *clu = EXFAT_EOF_CLUSTER;
 132                 return 0;
 133         }
 134
 135         *clu = last_clu = ei->start_clu;
 136
 137         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 138                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 139                         last_clu += clu_offset - 1;
 140
 141                         if (clu_offset == num_clusters)
 142                                 *clu = EXFAT_EOF_CLUSTER;
 143                         else
 144                                 *clu += clu_offset;
 145                 }
 146         } else if (ei->type == TYPE_FILE) {
 147                 unsigned int fclus = 0;
 148                 int err = exfat_get_cluster(inode, clu_offset,
 149                                 &fclus, clu, &last_clu, 1);
 150                 if (err)
 151                         return -EIO;
 152
 153                 clu_offset -= fclus;
 154         } else {
 155                 /* hint information */
 156                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
 157                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
 158                         clu_offset -= ei->hint_bmap.off;
 159                         /* hint_bmap.clu should be valid */
 160                         WARN_ON(ei->hint_bmap.clu < 2);
 161                         *clu = ei->hint_bmap.clu;
 162                 }
 163
 164                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 165                         last_clu = *clu;
 166                         if (exfat_get_next_cluster(sb, clu))
 167                                 return -EIO;
 168                         clu_offset--;
 169                 }
 170         }
 171
 172         if (*clu == EXFAT_EOF_CLUSTER) {
 173                 exfat_set_volume_dirty(sb);
 174
 175                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 176                                 EXFAT_EOF_CLUSTER : last_clu + 1;
 177                 new_clu.size = 0;
 178                 new_clu.flags = ei->flags;
 179
 180                 /* allocate a cluster */
 181                 if (num_to_be_allocated < 1) {
 182                         /* Broken FAT (i_sze > allocated FAT) */
 183                         exfat_fs_error(sb, "broken FAT chain.");
 184                         return -EIO;
 185                 }
 186
 187                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
 188                                 inode_needs_sync(inode));
 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                 } else {
 206                         if (new_clu.flags != ei->flags) {
 207                                 /* no-fat-chain bit is disabled,
 208                                  * so fat-chain should be synced with
 209                                  * alloc-bitmap
 210                                  */
 211                                 exfat_chain_cont_cluster(sb, ei->start_clu,
 212                                         num_clusters);
 213                                 ei->flags = ALLOC_FAT_CHAIN;
 214                         }
 215                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 216                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 217                                         return -EIO;
 218                 }
 219
 220                 num_clusters += num_to_be_allocated;
 221                 *clu = new_clu.dir;
 222
 223                 inode->i_blocks +=
 224                         num_to_be_allocated << sbi->sect_per_clus_bits;
 225
 226                 /*
 227                  * Move *clu pointer along FAT chains (hole care) because the
 228                  * caller of this function expect *clu to be the last cluster.
 229                  * This only works when num_to_be_allocated >= 2,
 230                  * *clu = (the first cluster of the allocated chain) =>
 231                  * (the last cluster of ...)
 232                  */
 233                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 234                         *clu += num_to_be_allocated - 1;
 235                 } else {
 236                         while (num_to_be_allocated > 1) {
 237                                 if (exfat_get_next_cluster(sb, clu))
 238                                         return -EIO;
 239                                 num_to_be_allocated--;
 240                         }
 241                 }
 242
 243         }
 244
 245         /* hint information */
 246         ei->hint_bmap.off = local_clu_offset;
 247         ei->hint_bmap.clu = *clu;
 248
 249         return 0;
 250 }
 251
 252 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 253                 struct buffer_head *bh, loff_t pos)
 254 {
 255         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 256                 return -EIO;
 257         set_buffer_new(bh);
 258
 259         /*
 260          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 261          */
 262         if (ei->i_size_ondisk > ei->i_size_aligned)
 263                 ei->i_size_aligned = ei->i_size_ondisk;
 264         return 0;
 265 }
 266
 267 static int exfat_get_block(struct inode *inode, sector_t iblock,
 268                 struct buffer_head *bh_result, int create)
 269 {
 270         struct exfat_inode_info *ei = EXFAT_I(inode);
 271         struct super_block *sb = inode->i_sb;
 272         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 273         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 274         int err = 0;
 275         unsigned long mapped_blocks = 0;
 276         unsigned int cluster, sec_offset;
 277         sector_t last_block;
 278         sector_t phys = 0;
 279         loff_t pos;
 280
 281         mutex_lock(&sbi->s_lock);
 282         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 283         if (iblock >= last_block && !create)
 284                 goto done;
 285
 286         /* Is this block already allocated? */
 287         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 288                         &cluster, create);
 289         if (err) {
 290                 if (err != -ENOSPC)
 291                         exfat_fs_error_ratelimit(sb,
 292                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 293                                 inode, (unsigned long long)iblock, err);
 294                 goto unlock_ret;
 295         }
 296
 297         if (cluster == EXFAT_EOF_CLUSTER)
 298                 goto done;
 299
 300         /* sector offset in cluster */
 301         sec_offset = iblock & (sbi->sect_per_clus - 1);
 302
 303         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 304         mapped_blocks = sbi->sect_per_clus - sec_offset;
 305         max_blocks = min(mapped_blocks, max_blocks);
 306
 307         /* Treat newly added block / cluster */
 308         if (iblock < last_block)
 309                 create = 0;
 310
 311         if (create || buffer_delay(bh_result)) {
 312                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 313                 if (ei->i_size_ondisk < pos)
 314                         ei->i_size_ondisk = pos;
 315         }
 316
 317         if (create) {
 318                 err = exfat_map_new_buffer(ei, bh_result, pos);
 319                 if (err) {
 320                         exfat_fs_error(sb,
 321                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 322                                         pos, ei->i_size_aligned);
 323                         goto unlock_ret;
 324                 }
 325         }
 326
 327         if (buffer_delay(bh_result))
 328                 clear_buffer_delay(bh_result);
 329         map_bh(bh_result, sb, phys);
 330 done:
 331         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 332 unlock_ret:
 333         mutex_unlock(&sbi->s_lock);
 334         return err;
 335 }
 336
 337 static int exfat_read_folio(struct file *file, struct folio *folio)
 338 {
 339         return mpage_read_folio(folio, exfat_get_block);
 340 }
 341
 342 static void exfat_readahead(struct readahead_control *rac)
 343 {
 344         mpage_readahead(rac, exfat_get_block);
 345 }
 346
 347 static int exfat_writepages(struct address_space *mapping,
 348                 struct writeback_control *wbc)
 349 {
 350         return mpage_writepages(mapping, wbc, exfat_get_block);
 351 }
 352
 353 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 354 {
 355         struct inode *inode = mapping->host;
 356
 357         if (to > i_size_read(inode)) {
 358                 truncate_pagecache(inode, i_size_read(inode));
 359                 inode->i_mtime = inode->i_ctime = current_time(inode);
 360                 exfat_truncate(inode);
 361         }
 362 }
 363
 364 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 365                 loff_t pos, unsigned int len,
 366                 struct page **pagep, void **fsdata)
 367 {
 368         int ret;
 369
 370         *pagep = NULL;
 371         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
 372                                exfat_get_block,
 373                                &EXFAT_I(mapping->host)->i_size_ondisk);
 374
 375         if (ret < 0)
 376                 exfat_write_failed(mapping, pos+len);
 377
 378         return ret;
 379 }
 380
 381 static int exfat_write_end(struct file *file, struct address_space *mapping,
 382                 loff_t pos, unsigned int len, unsigned int copied,
 383                 struct page *pagep, void *fsdata)
 384 {
 385         struct inode *inode = mapping->host;
 386         struct exfat_inode_info *ei = EXFAT_I(inode);
 387         int err;
 388
 389         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 390
 391         if (ei->i_size_aligned < i_size_read(inode)) {
 392                 exfat_fs_error(inode->i_sb,
 393                         "invalid size(size(%llu) > aligned(%llu)\n",
 394                         i_size_read(inode), ei->i_size_aligned);
 395                 return -EIO;
 396         }
 397
 398         if (err < len)
 399                 exfat_write_failed(mapping, pos+len);
 400
 401         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 402                 inode->i_mtime = inode->i_ctime = current_time(inode);
 403                 ei->attr |= ATTR_ARCHIVE;
 404                 mark_inode_dirty(inode);
 405         }
 406
 407         return err;
 408 }
 409
 410 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 411 {
 412         struct address_space *mapping = iocb->ki_filp->f_mapping;
 413         struct inode *inode = mapping->host;
 414         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 415         int rw = iov_iter_rw(iter);
 416         ssize_t ret;
 417
 418         if (rw == WRITE) {
 419                 /*
 420                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 421                  * so we need to update the ->i_size_aligned to block boundary.
 422                  *
 423                  * But we must fill the remaining area or hole by nul for
 424                  * updating ->i_size_aligned
 425                  *
 426                  * Return 0, and fallback to normal buffered write.
 427                  */
 428                 if (EXFAT_I(inode)->i_size_aligned < size)
 429                         return 0;
 430         }
 431
 432         /*
 433          * Need to use the DIO_LOCKING for avoiding the race
 434          * condition of exfat_get_block() and ->truncate().
 435          */
 436         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 437         if (ret < 0 && (rw & WRITE))
 438                 exfat_write_failed(mapping, size);
 439         return ret;
 440 }
 441
 442 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 443 {
 444         sector_t blocknr;
 445
 446         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 447         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 448         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 449         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 450         return blocknr;
 451 }
 452
 453 /*
 454  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 455  * up to the end of the block which corresponds to `from'.
 456  * This is required during truncate to physically zeroout the tail end
 457  * of that block so it doesn't yield old data if the file is later grown.
 458  * Also, avoid causing failure from fsx for cases of "data past EOF"
 459  */
 460 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 461 {
 462         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 463 }
 464
 465 static const struct address_space_operations exfat_aops = {
 466         .dirty_folio    = block_dirty_folio,
 467         .invalidate_folio = block_invalidate_folio,
 468         .read_folio     = exfat_read_folio,
 469         .readahead      = exfat_readahead,
 470         .writepages     = exfat_writepages,
 471         .write_begin    = exfat_write_begin,
 472         .write_end      = exfat_write_end,
 473         .direct_IO      = exfat_direct_IO,
 474         .bmap           = exfat_aop_bmap,
 475         .migrate_folio  = buffer_migrate_folio,
 476 };
 477
 478 static inline unsigned long exfat_hash(loff_t i_pos)
 479 {
 480         return hash_32(i_pos, EXFAT_HASH_BITS);
 481 }
 482
 483 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 484 {
 485         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 486         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 487
 488         spin_lock(&sbi->inode_hash_lock);
 489         EXFAT_I(inode)->i_pos = i_pos;
 490         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 491         spin_unlock(&sbi->inode_hash_lock);
 492 }
 493
 494 void exfat_unhash_inode(struct inode *inode)
 495 {
 496         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 497
 498         spin_lock(&sbi->inode_hash_lock);
 499         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 500         EXFAT_I(inode)->i_pos = 0;
 501         spin_unlock(&sbi->inode_hash_lock);
 502 }
 503
 504 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 505 {
 506         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 507         struct exfat_inode_info *info;
 508         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 509         struct inode *inode = NULL;
 510
 511         spin_lock(&sbi->inode_hash_lock);
 512         hlist_for_each_entry(info, head, i_hash_fat) {
 513                 WARN_ON(info->vfs_inode.i_sb != sb);
 514
 515                 if (i_pos != info->i_pos)
 516                         continue;
 517                 inode = igrab(&info->vfs_inode);
 518                 if (inode)
 519                         break;
 520         }
 521         spin_unlock(&sbi->inode_hash_lock);
 522         return inode;
 523 }
 524
 525 /* doesn't deal with root inode */
 526 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 527 {
 528         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 529         struct exfat_inode_info *ei = EXFAT_I(inode);
 530         loff_t size = info->size;
 531
 532         ei->dir = info->dir;
 533         ei->entry = info->entry;
 534         ei->attr = info->attr;
 535         ei->start_clu = info->start_clu;
 536         ei->flags = info->flags;
 537         ei->type = info->type;
 538
 539         ei->version = 0;
 540         ei->hint_stat.eidx = 0;
 541         ei->hint_stat.clu = info->start_clu;
 542         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 543         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 544         ei->i_pos = 0;
 545
 546         inode->i_uid = sbi->options.fs_uid;
 547         inode->i_gid = sbi->options.fs_gid;
 548         inode_inc_iversion(inode);
 549         inode->i_generation = get_random_u32();
 550
 551         if (info->attr & ATTR_SUBDIR) { /* directory */
 552                 inode->i_generation &= ~1;
 553                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 554                 inode->i_op = &exfat_dir_inode_operations;
 555                 inode->i_fop = &exfat_dir_operations;
 556                 set_nlink(inode, info->num_subdirs);
 557         } else { /* regular file */
 558                 inode->i_generation |= 1;
 559                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 560                 inode->i_op = &exfat_file_inode_operations;
 561                 inode->i_fop = &exfat_file_operations;
 562                 inode->i_mapping->a_ops = &exfat_aops;
 563                 inode->i_mapping->nrpages = 0;
 564         }
 565
 566         i_size_write(inode, size);
 567
 568         /* ondisk and aligned size should be aligned with block size */
 569         if (size & (inode->i_sb->s_blocksize - 1)) {
 570                 size |= (inode->i_sb->s_blocksize - 1);
 571                 size++;
 572         }
 573
 574         ei->i_size_aligned = size;
 575         ei->i_size_ondisk = size;
 576
 577         exfat_save_attr(inode, info->attr);
 578
 579         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
 580                                 inode->i_blkbits;
 581         inode->i_mtime = info->mtime;
 582         inode->i_ctime = info->mtime;
 583         ei->i_crtime = info->crtime;
 584         inode->i_atime = info->atime;
 585
 586         return 0;
 587 }
 588
 589 struct inode *exfat_build_inode(struct super_block *sb,
 590                 struct exfat_dir_entry *info, loff_t i_pos)
 591 {
 592         struct inode *inode;
 593         int err;
 594
 595         inode = exfat_iget(sb, i_pos);
 596         if (inode)
 597                 goto out;
 598         inode = new_inode(sb);
 599         if (!inode) {
 600                 inode = ERR_PTR(-ENOMEM);
 601                 goto out;
 602         }
 603         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 604         inode_set_iversion(inode, 1);
 605         err = exfat_fill_inode(inode, info);
 606         if (err) {
 607                 iput(inode);
 608                 inode = ERR_PTR(err);
 609                 goto out;
 610         }
 611         exfat_hash_inode(inode, i_pos);
 612         insert_inode_hash(inode);
 613 out:
 614         return inode;
 615 }
 616
 617 void exfat_evict_inode(struct inode *inode)
 618 {
 619         truncate_inode_pages(&inode->i_data, 0);
 620
 621         if (!inode->i_nlink) {
 622                 i_size_write(inode, 0);
 623                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 624                 __exfat_truncate(inode);
 625                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 626         }
 627
 628         invalidate_inode_buffers(inode);
 629         clear_inode(inode);
 630         exfat_cache_inval_inode(inode);
 631         exfat_unhash_inode(inode);
 632 }