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 += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
 224
 225                 /*
 226                  * Move *clu pointer along FAT chains (hole care) because the
 227                  * caller of this function expect *clu to be the last cluster.
 228                  * This only works when num_to_be_allocated >= 2,
 229                  * *clu = (the first cluster of the allocated chain) =>
 230                  * (the last cluster of ...)
 231                  */
 232                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 233                         *clu += num_to_be_allocated - 1;
 234                 } else {
 235                         while (num_to_be_allocated > 1) {
 236                                 if (exfat_get_next_cluster(sb, clu))
 237                                         return -EIO;
 238                                 num_to_be_allocated--;
 239                         }
 240                 }
 241
 242         }
 243
 244         /* hint information */
 245         ei->hint_bmap.off = local_clu_offset;
 246         ei->hint_bmap.clu = *clu;
 247
 248         return 0;
 249 }
 250
 251 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 252                 struct buffer_head *bh, loff_t pos)
 253 {
 254         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 255                 return -EIO;
 256         set_buffer_new(bh);
 257
 258         /*
 259          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 260          */
 261         if (ei->i_size_ondisk > ei->i_size_aligned)
 262                 ei->i_size_aligned = ei->i_size_ondisk;
 263         return 0;
 264 }
 265
 266 static int exfat_get_block(struct inode *inode, sector_t iblock,
 267                 struct buffer_head *bh_result, int create)
 268 {
 269         struct exfat_inode_info *ei = EXFAT_I(inode);
 270         struct super_block *sb = inode->i_sb;
 271         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 272         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 273         int err = 0;
 274         unsigned long mapped_blocks = 0;
 275         unsigned int cluster, sec_offset;
 276         sector_t last_block;
 277         sector_t phys = 0;
 278         loff_t pos;
 279
 280         mutex_lock(&sbi->s_lock);
 281         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 282         if (iblock >= last_block && !create)
 283                 goto done;
 284
 285         /* Is this block already allocated? */
 286         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 287                         &cluster, create);
 288         if (err) {
 289                 if (err != -ENOSPC)
 290                         exfat_fs_error_ratelimit(sb,
 291                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 292                                 inode, (unsigned long long)iblock, err);
 293                 goto unlock_ret;
 294         }
 295
 296         if (cluster == EXFAT_EOF_CLUSTER)
 297                 goto done;
 298
 299         /* sector offset in cluster */
 300         sec_offset = iblock & (sbi->sect_per_clus - 1);
 301
 302         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 303         mapped_blocks = sbi->sect_per_clus - sec_offset;
 304         max_blocks = min(mapped_blocks, max_blocks);
 305
 306         /* Treat newly added block / cluster */
 307         if (iblock < last_block)
 308                 create = 0;
 309
 310         if (create || buffer_delay(bh_result)) {
 311                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 312                 if (ei->i_size_ondisk < pos)
 313                         ei->i_size_ondisk = pos;
 314         }
 315
 316         if (create) {
 317                 err = exfat_map_new_buffer(ei, bh_result, pos);
 318                 if (err) {
 319                         exfat_fs_error(sb,
 320                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 321                                         pos, ei->i_size_aligned);
 322                         goto unlock_ret;
 323                 }
 324         }
 325
 326         if (buffer_delay(bh_result))
 327                 clear_buffer_delay(bh_result);
 328         map_bh(bh_result, sb, phys);
 329 done:
 330         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 331 unlock_ret:
 332         mutex_unlock(&sbi->s_lock);
 333         return err;
 334 }
 335
 336 static int exfat_read_folio(struct file *file, struct folio *folio)
 337 {
 338         return mpage_read_folio(folio, exfat_get_block);
 339 }
 340
 341 static void exfat_readahead(struct readahead_control *rac)
 342 {
 343         mpage_readahead(rac, exfat_get_block);
 344 }
 345
 346 static int exfat_writepages(struct address_space *mapping,
 347                 struct writeback_control *wbc)
 348 {
 349         return mpage_writepages(mapping, wbc, exfat_get_block);
 350 }
 351
 352 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 353 {
 354         struct inode *inode = mapping->host;
 355
 356         if (to > i_size_read(inode)) {
 357                 truncate_pagecache(inode, i_size_read(inode));
 358                 inode->i_mtime = inode->i_ctime = current_time(inode);
 359                 exfat_truncate(inode);
 360         }
 361 }
 362
 363 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 364                 loff_t pos, unsigned int len,
 365                 struct page **pagep, void **fsdata)
 366 {
 367         int ret;
 368
 369         *pagep = NULL;
 370         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
 371                                exfat_get_block,
 372                                &EXFAT_I(mapping->host)->i_size_ondisk);
 373
 374         if (ret < 0)
 375                 exfat_write_failed(mapping, pos+len);
 376
 377         return ret;
 378 }
 379
 380 static int exfat_write_end(struct file *file, struct address_space *mapping,
 381                 loff_t pos, unsigned int len, unsigned int copied,
 382                 struct page *pagep, void *fsdata)
 383 {
 384         struct inode *inode = mapping->host;
 385         struct exfat_inode_info *ei = EXFAT_I(inode);
 386         int err;
 387
 388         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 389
 390         if (ei->i_size_aligned < i_size_read(inode)) {
 391                 exfat_fs_error(inode->i_sb,
 392                         "invalid size(size(%llu) > aligned(%llu)\n",
 393                         i_size_read(inode), ei->i_size_aligned);
 394                 return -EIO;
 395         }
 396
 397         if (err < len)
 398                 exfat_write_failed(mapping, pos+len);
 399
 400         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 401                 inode->i_mtime = inode->i_ctime = current_time(inode);
 402                 ei->attr |= ATTR_ARCHIVE;
 403                 mark_inode_dirty(inode);
 404         }
 405
 406         return err;
 407 }
 408
 409 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 410 {
 411         struct address_space *mapping = iocb->ki_filp->f_mapping;
 412         struct inode *inode = mapping->host;
 413         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 414         int rw = iov_iter_rw(iter);
 415         ssize_t ret;
 416
 417         if (rw == WRITE) {
 418                 /*
 419                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 420                  * so we need to update the ->i_size_aligned to block boundary.
 421                  *
 422                  * But we must fill the remaining area or hole by nul for
 423                  * updating ->i_size_aligned
 424                  *
 425                  * Return 0, and fallback to normal buffered write.
 426                  */
 427                 if (EXFAT_I(inode)->i_size_aligned < size)
 428                         return 0;
 429         }
 430
 431         /*
 432          * Need to use the DIO_LOCKING for avoiding the race
 433          * condition of exfat_get_block() and ->truncate().
 434          */
 435         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 436         if (ret < 0 && (rw & WRITE))
 437                 exfat_write_failed(mapping, size);
 438         return ret;
 439 }
 440
 441 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 442 {
 443         sector_t blocknr;
 444
 445         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 446         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 447         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 448         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 449         return blocknr;
 450 }
 451
 452 /*
 453  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 454  * up to the end of the block which corresponds to `from'.
 455  * This is required during truncate to physically zeroout the tail end
 456  * of that block so it doesn't yield old data if the file is later grown.
 457  * Also, avoid causing failure from fsx for cases of "data past EOF"
 458  */
 459 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 460 {
 461         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 462 }
 463
 464 static const struct address_space_operations exfat_aops = {
 465         .dirty_folio    = block_dirty_folio,
 466         .invalidate_folio = block_invalidate_folio,
 467         .read_folio     = exfat_read_folio,
 468         .readahead      = exfat_readahead,
 469         .writepages     = exfat_writepages,
 470         .write_begin    = exfat_write_begin,
 471         .write_end      = exfat_write_end,
 472         .direct_IO      = exfat_direct_IO,
 473         .bmap           = exfat_aop_bmap,
 474         .migrate_folio  = buffer_migrate_folio,
 475 };
 476
 477 static inline unsigned long exfat_hash(loff_t i_pos)
 478 {
 479         return hash_32(i_pos, EXFAT_HASH_BITS);
 480 }
 481
 482 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 483 {
 484         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 485         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 486
 487         spin_lock(&sbi->inode_hash_lock);
 488         EXFAT_I(inode)->i_pos = i_pos;
 489         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 490         spin_unlock(&sbi->inode_hash_lock);
 491 }
 492
 493 void exfat_unhash_inode(struct inode *inode)
 494 {
 495         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 496
 497         spin_lock(&sbi->inode_hash_lock);
 498         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 499         EXFAT_I(inode)->i_pos = 0;
 500         spin_unlock(&sbi->inode_hash_lock);
 501 }
 502
 503 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 504 {
 505         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 506         struct exfat_inode_info *info;
 507         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 508         struct inode *inode = NULL;
 509
 510         spin_lock(&sbi->inode_hash_lock);
 511         hlist_for_each_entry(info, head, i_hash_fat) {
 512                 WARN_ON(info->vfs_inode.i_sb != sb);
 513
 514                 if (i_pos != info->i_pos)
 515                         continue;
 516                 inode = igrab(&info->vfs_inode);
 517                 if (inode)
 518                         break;
 519         }
 520         spin_unlock(&sbi->inode_hash_lock);
 521         return inode;
 522 }
 523
 524 /* doesn't deal with root inode */
 525 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 526 {
 527         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 528         struct exfat_inode_info *ei = EXFAT_I(inode);
 529         loff_t size = info->size;
 530
 531         ei->dir = info->dir;
 532         ei->entry = info->entry;
 533         ei->attr = info->attr;
 534         ei->start_clu = info->start_clu;
 535         ei->flags = info->flags;
 536         ei->type = info->type;
 537
 538         ei->version = 0;
 539         ei->hint_stat.eidx = 0;
 540         ei->hint_stat.clu = info->start_clu;
 541         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 542         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 543         ei->i_pos = 0;
 544
 545         inode->i_uid = sbi->options.fs_uid;
 546         inode->i_gid = sbi->options.fs_gid;
 547         inode_inc_iversion(inode);
 548         inode->i_generation = get_random_u32();
 549
 550         if (info->attr & ATTR_SUBDIR) { /* directory */
 551                 inode->i_generation &= ~1;
 552                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 553                 inode->i_op = &exfat_dir_inode_operations;
 554                 inode->i_fop = &exfat_dir_operations;
 555                 set_nlink(inode, info->num_subdirs);
 556         } else { /* regular file */
 557                 inode->i_generation |= 1;
 558                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 559                 inode->i_op = &exfat_file_inode_operations;
 560                 inode->i_fop = &exfat_file_operations;
 561                 inode->i_mapping->a_ops = &exfat_aops;
 562                 inode->i_mapping->nrpages = 0;
 563         }
 564
 565         i_size_write(inode, size);
 566
 567         /* ondisk and aligned size should be aligned with block size */
 568         if (size & (inode->i_sb->s_blocksize - 1)) {
 569                 size |= (inode->i_sb->s_blocksize - 1);
 570                 size++;
 571         }
 572
 573         ei->i_size_aligned = size;
 574         ei->i_size_ondisk = size;
 575
 576         exfat_save_attr(inode, info->attr);
 577
 578         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 579         inode->i_mtime = info->mtime;
 580         inode->i_ctime = info->mtime;
 581         ei->i_crtime = info->crtime;
 582         inode->i_atime = info->atime;
 583
 584         return 0;
 585 }
 586
 587 struct inode *exfat_build_inode(struct super_block *sb,
 588                 struct exfat_dir_entry *info, loff_t i_pos)
 589 {
 590         struct inode *inode;
 591         int err;
 592
 593         inode = exfat_iget(sb, i_pos);
 594         if (inode)
 595                 goto out;
 596         inode = new_inode(sb);
 597         if (!inode) {
 598                 inode = ERR_PTR(-ENOMEM);
 599                 goto out;
 600         }
 601         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 602         inode_set_iversion(inode, 1);
 603         err = exfat_fill_inode(inode, info);
 604         if (err) {
 605                 iput(inode);
 606                 inode = ERR_PTR(err);
 607                 goto out;
 608         }
 609         exfat_hash_inode(inode, i_pos);
 610         insert_inode_hash(inode);
 611 out:
 612         return inode;
 613 }
 614
 615 void exfat_evict_inode(struct inode *inode)
 616 {
 617         truncate_inode_pages(&inode->i_data, 0);
 618
 619         if (!inode->i_nlink) {
 620                 i_size_write(inode, 0);
 621                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 622                 __exfat_truncate(inode);
 623                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 624         }
 625
 626         invalidate_inode_buffers(inode);
 627         clear_inode(inode);
 628         exfat_cache_inval_inode(inode);
 629         exfat_unhash_inode(inode);
 630 }