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 = 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 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         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         if (on_disk_size) {
  79                 ep2->dentry.stream.flags = ei->flags;
  80                 ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu);
  81         } else {
  82                 ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
  83                 ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
  84         }
  85
  86         exfat_update_dir_chksum_with_entry_set(es);
  87         return exfat_free_dentry_set(es, sync);
  88 }
  89
  90 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
  91 {
  92         int ret;
  93
  94         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
  95         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
  96         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
  97
  98         return ret;
  99 }
 100
 101 void exfat_sync_inode(struct inode *inode)
 102 {
 103         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
 104         __exfat_write_inode(inode, 1);
 105 }
 106
 107 /*
 108  * Input: inode, (logical) clu_offset, target allocation area
 109  * Output: errcode, cluster number
 110  * *clu = (~0), if it's unable to allocate a new cluster
 111  */
 112 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 113                 unsigned int *clu, int create)
 114 {
 115         int ret;
 116         unsigned int last_clu;
 117         struct exfat_chain new_clu;
 118         struct super_block *sb = inode->i_sb;
 119         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 120         struct exfat_inode_info *ei = EXFAT_I(inode);
 121         unsigned int local_clu_offset = clu_offset;
 122         unsigned int num_to_be_allocated = 0, num_clusters = 0;
 123
 124         if (ei->i_size_ondisk > 0)
 125                 num_clusters =
 126                         EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, 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_volume_dirty(sb);
 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                                 inode_needs_sync(inode));
 190                 if (ret)
 191                         return ret;
 192
 193                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
 194                     new_clu.dir == EXFAT_FREE_CLUSTER) {
 195                         exfat_fs_error(sb,
 196                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
 197                                 last_clu, new_clu.dir);
 198                         return -EIO;
 199                 }
 200
 201                 /* append to the FAT chain */
 202                 if (last_clu == EXFAT_EOF_CLUSTER) {
 203                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 204                                 ei->flags = ALLOC_FAT_CHAIN;
 205                         ei->start_clu = new_clu.dir;
 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                         }
 216                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 217                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 218                                         return -EIO;
 219                 }
 220
 221                 num_clusters += num_to_be_allocated;
 222                 *clu = new_clu.dir;
 223
 224                 inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
 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_writepage(struct page *page, struct writeback_control *wbc)
 348 {
 349         return block_write_full_page(page, exfat_get_block, wbc);
 350 }
 351
 352 static int exfat_writepages(struct address_space *mapping,
 353                 struct writeback_control *wbc)
 354 {
 355         return mpage_writepages(mapping, wbc, exfat_get_block);
 356 }
 357
 358 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 359 {
 360         struct inode *inode = mapping->host;
 361
 362         if (to > i_size_read(inode)) {
 363                 truncate_pagecache(inode, i_size_read(inode));
 364                 inode->i_mtime = inode->i_ctime = current_time(inode);
 365                 exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
 366         }
 367 }
 368
 369 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 370                 loff_t pos, unsigned int len,
 371                 struct page **pagep, void **fsdata)
 372 {
 373         int ret;
 374
 375         *pagep = NULL;
 376         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
 377                                exfat_get_block,
 378                                &EXFAT_I(mapping->host)->i_size_ondisk);
 379
 380         if (ret < 0)
 381                 exfat_write_failed(mapping, pos+len);
 382
 383         return ret;
 384 }
 385
 386 static int exfat_write_end(struct file *file, struct address_space *mapping,
 387                 loff_t pos, unsigned int len, unsigned int copied,
 388                 struct page *pagep, void *fsdata)
 389 {
 390         struct inode *inode = mapping->host;
 391         struct exfat_inode_info *ei = EXFAT_I(inode);
 392         int err;
 393
 394         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 395
 396         if (ei->i_size_aligned < i_size_read(inode)) {
 397                 exfat_fs_error(inode->i_sb,
 398                         "invalid size(size(%llu) > aligned(%llu)\n",
 399                         i_size_read(inode), ei->i_size_aligned);
 400                 return -EIO;
 401         }
 402
 403         if (err < len)
 404                 exfat_write_failed(mapping, pos+len);
 405
 406         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 407                 inode->i_mtime = inode->i_ctime = current_time(inode);
 408                 ei->attr |= ATTR_ARCHIVE;
 409                 mark_inode_dirty(inode);
 410         }
 411
 412         return err;
 413 }
 414
 415 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 416 {
 417         struct address_space *mapping = iocb->ki_filp->f_mapping;
 418         struct inode *inode = mapping->host;
 419         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 420         int rw = iov_iter_rw(iter);
 421         ssize_t ret;
 422
 423         if (rw == WRITE) {
 424                 /*
 425                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 426                  * so we need to update the ->i_size_aligned to block boundary.
 427                  *
 428                  * But we must fill the remaining area or hole by nul for
 429                  * updating ->i_size_aligned
 430                  *
 431                  * Return 0, and fallback to normal buffered write.
 432                  */
 433                 if (EXFAT_I(inode)->i_size_aligned < size)
 434                         return 0;
 435         }
 436
 437         /*
 438          * Need to use the DIO_LOCKING for avoiding the race
 439          * condition of exfat_get_block() and ->truncate().
 440          */
 441         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 442         if (ret < 0 && (rw & WRITE))
 443                 exfat_write_failed(mapping, size);
 444         return ret;
 445 }
 446
 447 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 448 {
 449         sector_t blocknr;
 450
 451         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 452         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 453         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 454         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 455         return blocknr;
 456 }
 457
 458 /*
 459  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 460  * up to the end of the block which corresponds to `from'.
 461  * This is required during truncate to physically zeroout the tail end
 462  * of that block so it doesn't yield old data if the file is later grown.
 463  * Also, avoid causing failure from fsx for cases of "data past EOF"
 464  */
 465 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 466 {
 467         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 468 }
 469
 470 static const struct address_space_operations exfat_aops = {
 471         .dirty_folio    = block_dirty_folio,
 472         .invalidate_folio = block_invalidate_folio,
 473         .read_folio     = exfat_read_folio,
 474         .readahead      = exfat_readahead,
 475         .writepage      = exfat_writepage,
 476         .writepages     = exfat_writepages,
 477         .write_begin    = exfat_write_begin,
 478         .write_end      = exfat_write_end,
 479         .direct_IO      = exfat_direct_IO,
 480         .bmap           = exfat_aop_bmap
 481 };
 482
 483 static inline unsigned long exfat_hash(loff_t i_pos)
 484 {
 485         return hash_32(i_pos, EXFAT_HASH_BITS);
 486 }
 487
 488 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 489 {
 490         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 491         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 492
 493         spin_lock(&sbi->inode_hash_lock);
 494         EXFAT_I(inode)->i_pos = i_pos;
 495         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 496         spin_unlock(&sbi->inode_hash_lock);
 497 }
 498
 499 void exfat_unhash_inode(struct inode *inode)
 500 {
 501         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 502
 503         spin_lock(&sbi->inode_hash_lock);
 504         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 505         EXFAT_I(inode)->i_pos = 0;
 506         spin_unlock(&sbi->inode_hash_lock);
 507 }
 508
 509 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 510 {
 511         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 512         struct exfat_inode_info *info;
 513         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 514         struct inode *inode = NULL;
 515
 516         spin_lock(&sbi->inode_hash_lock);
 517         hlist_for_each_entry(info, head, i_hash_fat) {
 518                 WARN_ON(info->vfs_inode.i_sb != sb);
 519
 520                 if (i_pos != info->i_pos)
 521                         continue;
 522                 inode = igrab(&info->vfs_inode);
 523                 if (inode)
 524                         break;
 525         }
 526         spin_unlock(&sbi->inode_hash_lock);
 527         return inode;
 528 }
 529
 530 /* doesn't deal with root inode */
 531 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 532 {
 533         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 534         struct exfat_inode_info *ei = EXFAT_I(inode);
 535         loff_t size = info->size;
 536
 537         ei->dir = info->dir;
 538         ei->entry = info->entry;
 539         ei->attr = info->attr;
 540         ei->start_clu = info->start_clu;
 541         ei->flags = info->flags;
 542         ei->type = info->type;
 543
 544         ei->version = 0;
 545         ei->hint_stat.eidx = 0;
 546         ei->hint_stat.clu = info->start_clu;
 547         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 548         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 549         ei->i_pos = 0;
 550
 551         inode->i_uid = sbi->options.fs_uid;
 552         inode->i_gid = sbi->options.fs_gid;
 553         inode_inc_iversion(inode);
 554         inode->i_generation = get_random_u32();
 555
 556         if (info->attr & ATTR_SUBDIR) { /* directory */
 557                 inode->i_generation &= ~1;
 558                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 559                 inode->i_op = &exfat_dir_inode_operations;
 560                 inode->i_fop = &exfat_dir_operations;
 561                 set_nlink(inode, info->num_subdirs);
 562         } else { /* regular file */
 563                 inode->i_generation |= 1;
 564                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 565                 inode->i_op = &exfat_file_inode_operations;
 566                 inode->i_fop = &exfat_file_operations;
 567                 inode->i_mapping->a_ops = &exfat_aops;
 568                 inode->i_mapping->nrpages = 0;
 569         }
 570
 571         i_size_write(inode, size);
 572
 573         /* ondisk and aligned size should be aligned with block size */
 574         if (size & (inode->i_sb->s_blocksize - 1)) {
 575                 size |= (inode->i_sb->s_blocksize - 1);
 576                 size++;
 577         }
 578
 579         ei->i_size_aligned = size;
 580         ei->i_size_ondisk = size;
 581
 582         exfat_save_attr(inode, info->attr);
 583
 584         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 585         inode->i_mtime = info->mtime;
 586         inode->i_ctime = info->mtime;
 587         ei->i_crtime = info->crtime;
 588         inode->i_atime = info->atime;
 589
 590         return 0;
 591 }
 592
 593 struct inode *exfat_build_inode(struct super_block *sb,
 594                 struct exfat_dir_entry *info, loff_t i_pos)
 595 {
 596         struct inode *inode;
 597         int err;
 598
 599         inode = exfat_iget(sb, i_pos);
 600         if (inode)
 601                 goto out;
 602         inode = new_inode(sb);
 603         if (!inode) {
 604                 inode = ERR_PTR(-ENOMEM);
 605                 goto out;
 606         }
 607         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 608         inode_set_iversion(inode, 1);
 609         err = exfat_fill_inode(inode, info);
 610         if (err) {
 611                 iput(inode);
 612                 inode = ERR_PTR(err);
 613                 goto out;
 614         }
 615         exfat_hash_inode(inode, i_pos);
 616         insert_inode_hash(inode);
 617 out:
 618         return inode;
 619 }
 620
 621 void exfat_evict_inode(struct inode *inode)
 622 {
 623         truncate_inode_pages(&inode->i_data, 0);
 624
 625         if (!inode->i_nlink) {
 626                 i_size_write(inode, 0);
 627                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 628                 __exfat_truncate(inode, 0);
 629                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 630         }
 631
 632         invalidate_inode_buffers(inode);
 633         clear_inode(inode);
 634         exfat_cache_inval_inode(inode);
 635         exfat_unhash_inode(inode);
 636 }