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 +=
 225                         num_to_be_allocated << sbi->sect_per_clus_bits;
 226
 227                 /*
 228                  * Move *clu pointer along FAT chains (hole care) because the
 229                  * caller of this function expect *clu to be the last cluster.
 230                  * This only works when num_to_be_allocated >= 2,
 231                  * *clu = (the first cluster of the allocated chain) =>
 232                  * (the last cluster of ...)
 233                  */
 234                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 235                         *clu += num_to_be_allocated - 1;
 236                 } else {
 237                         while (num_to_be_allocated > 1) {
 238                                 if (exfat_get_next_cluster(sb, clu))
 239                                         return -EIO;
 240                                 num_to_be_allocated--;
 241                         }
 242                 }
 243
 244         }
 245
 246         /* hint information */
 247         ei->hint_bmap.off = local_clu_offset;
 248         ei->hint_bmap.clu = *clu;
 249
 250         return 0;
 251 }
 252
 253 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 254                 struct buffer_head *bh, loff_t pos)
 255 {
 256         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 257                 return -EIO;
 258         set_buffer_new(bh);
 259
 260         /*
 261          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 262          */
 263         if (ei->i_size_ondisk > ei->i_size_aligned)
 264                 ei->i_size_aligned = ei->i_size_ondisk;
 265         return 0;
 266 }
 267
 268 static int exfat_get_block(struct inode *inode, sector_t iblock,
 269                 struct buffer_head *bh_result, int create)
 270 {
 271         struct exfat_inode_info *ei = EXFAT_I(inode);
 272         struct super_block *sb = inode->i_sb;
 273         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 274         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 275         int err = 0;
 276         unsigned long mapped_blocks = 0;
 277         unsigned int cluster, sec_offset;
 278         sector_t last_block;
 279         sector_t phys = 0;
 280         loff_t pos;
 281
 282         mutex_lock(&sbi->s_lock);
 283         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 284         if (iblock >= last_block && !create)
 285                 goto done;
 286
 287         /* Is this block already allocated? */
 288         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 289                         &cluster, create);
 290         if (err) {
 291                 if (err != -ENOSPC)
 292                         exfat_fs_error_ratelimit(sb,
 293                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 294                                 inode, (unsigned long long)iblock, err);
 295                 goto unlock_ret;
 296         }
 297
 298         if (cluster == EXFAT_EOF_CLUSTER)
 299                 goto done;
 300
 301         /* sector offset in cluster */
 302         sec_offset = iblock & (sbi->sect_per_clus - 1);
 303
 304         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 305         mapped_blocks = sbi->sect_per_clus - sec_offset;
 306         max_blocks = min(mapped_blocks, max_blocks);
 307
 308         /* Treat newly added block / cluster */
 309         if (iblock < last_block)
 310                 create = 0;
 311
 312         if (create || buffer_delay(bh_result)) {
 313                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 314                 if (ei->i_size_ondisk < pos)
 315                         ei->i_size_ondisk = pos;
 316         }
 317
 318         if (create) {
 319                 err = exfat_map_new_buffer(ei, bh_result, pos);
 320                 if (err) {
 321                         exfat_fs_error(sb,
 322                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 323                                         pos, ei->i_size_aligned);
 324                         goto unlock_ret;
 325                 }
 326         }
 327
 328         if (buffer_delay(bh_result))
 329                 clear_buffer_delay(bh_result);
 330         map_bh(bh_result, sb, phys);
 331 done:
 332         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 333 unlock_ret:
 334         mutex_unlock(&sbi->s_lock);
 335         return err;
 336 }
 337
 338 static int exfat_read_folio(struct file *file, struct folio *folio)
 339 {
 340         return mpage_read_folio(folio, exfat_get_block);
 341 }
 342
 343 static void exfat_readahead(struct readahead_control *rac)
 344 {
 345         mpage_readahead(rac, exfat_get_block);
 346 }
 347
 348 static int exfat_writepage(struct page *page, struct writeback_control *wbc)
 349 {
 350         return block_write_full_page(page, exfat_get_block, wbc);
 351 }
 352
 353 static int exfat_writepages(struct address_space *mapping,
 354                 struct writeback_control *wbc)
 355 {
 356         return mpage_writepages(mapping, wbc, exfat_get_block);
 357 }
 358
 359 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 360 {
 361         struct inode *inode = mapping->host;
 362
 363         if (to > i_size_read(inode)) {
 364                 truncate_pagecache(inode, i_size_read(inode));
 365                 inode->i_mtime = inode->i_ctime = current_time(inode);
 366                 exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned);
 367         }
 368 }
 369
 370 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 371                 loff_t pos, unsigned int len,
 372                 struct page **pagep, void **fsdata)
 373 {
 374         int ret;
 375
 376         *pagep = NULL;
 377         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
 378                                exfat_get_block,
 379                                &EXFAT_I(mapping->host)->i_size_ondisk);
 380
 381         if (ret < 0)
 382                 exfat_write_failed(mapping, pos+len);
 383
 384         return ret;
 385 }
 386
 387 static int exfat_write_end(struct file *file, struct address_space *mapping,
 388                 loff_t pos, unsigned int len, unsigned int copied,
 389                 struct page *pagep, void *fsdata)
 390 {
 391         struct inode *inode = mapping->host;
 392         struct exfat_inode_info *ei = EXFAT_I(inode);
 393         int err;
 394
 395         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 396
 397         if (ei->i_size_aligned < i_size_read(inode)) {
 398                 exfat_fs_error(inode->i_sb,
 399                         "invalid size(size(%llu) > aligned(%llu)\n",
 400                         i_size_read(inode), ei->i_size_aligned);
 401                 return -EIO;
 402         }
 403
 404         if (err < len)
 405                 exfat_write_failed(mapping, pos+len);
 406
 407         if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) {
 408                 inode->i_mtime = inode->i_ctime = current_time(inode);
 409                 ei->attr |= ATTR_ARCHIVE;
 410                 mark_inode_dirty(inode);
 411         }
 412
 413         return err;
 414 }
 415
 416 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 417 {
 418         struct address_space *mapping = iocb->ki_filp->f_mapping;
 419         struct inode *inode = mapping->host;
 420         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 421         int rw = iov_iter_rw(iter);
 422         ssize_t ret;
 423
 424         if (rw == WRITE) {
 425                 /*
 426                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 427                  * so we need to update the ->i_size_aligned to block boundary.
 428                  *
 429                  * But we must fill the remaining area or hole by nul for
 430                  * updating ->i_size_aligned
 431                  *
 432                  * Return 0, and fallback to normal buffered write.
 433                  */
 434                 if (EXFAT_I(inode)->i_size_aligned < size)
 435                         return 0;
 436         }
 437
 438         /*
 439          * Need to use the DIO_LOCKING for avoiding the race
 440          * condition of exfat_get_block() and ->truncate().
 441          */
 442         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 443         if (ret < 0 && (rw & WRITE))
 444                 exfat_write_failed(mapping, size);
 445         return ret;
 446 }
 447
 448 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 449 {
 450         sector_t blocknr;
 451
 452         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 453         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 454         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 455         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 456         return blocknr;
 457 }
 458
 459 /*
 460  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 461  * up to the end of the block which corresponds to `from'.
 462  * This is required during truncate to physically zeroout the tail end
 463  * of that block so it doesn't yield old data if the file is later grown.
 464  * Also, avoid causing failure from fsx for cases of "data past EOF"
 465  */
 466 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 467 {
 468         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 469 }
 470
 471 static const struct address_space_operations exfat_aops = {
 472         .dirty_folio    = block_dirty_folio,
 473         .invalidate_folio = block_invalidate_folio,
 474         .read_folio     = exfat_read_folio,
 475         .readahead      = exfat_readahead,
 476         .writepage      = exfat_writepage,
 477         .writepages     = exfat_writepages,
 478         .write_begin    = exfat_write_begin,
 479         .write_end      = exfat_write_end,
 480         .direct_IO      = exfat_direct_IO,
 481         .bmap           = exfat_aop_bmap
 482 };
 483
 484 static inline unsigned long exfat_hash(loff_t i_pos)
 485 {
 486         return hash_32(i_pos, EXFAT_HASH_BITS);
 487 }
 488
 489 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 490 {
 491         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 492         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 493
 494         spin_lock(&sbi->inode_hash_lock);
 495         EXFAT_I(inode)->i_pos = i_pos;
 496         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 497         spin_unlock(&sbi->inode_hash_lock);
 498 }
 499
 500 void exfat_unhash_inode(struct inode *inode)
 501 {
 502         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 503
 504         spin_lock(&sbi->inode_hash_lock);
 505         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 506         EXFAT_I(inode)->i_pos = 0;
 507         spin_unlock(&sbi->inode_hash_lock);
 508 }
 509
 510 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 511 {
 512         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 513         struct exfat_inode_info *info;
 514         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 515         struct inode *inode = NULL;
 516
 517         spin_lock(&sbi->inode_hash_lock);
 518         hlist_for_each_entry(info, head, i_hash_fat) {
 519                 WARN_ON(info->vfs_inode.i_sb != sb);
 520
 521                 if (i_pos != info->i_pos)
 522                         continue;
 523                 inode = igrab(&info->vfs_inode);
 524                 if (inode)
 525                         break;
 526         }
 527         spin_unlock(&sbi->inode_hash_lock);
 528         return inode;
 529 }
 530
 531 /* doesn't deal with root inode */
 532 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 533 {
 534         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 535         struct exfat_inode_info *ei = EXFAT_I(inode);
 536         loff_t size = info->size;
 537
 538         ei->dir = info->dir;
 539         ei->entry = info->entry;
 540         ei->attr = info->attr;
 541         ei->start_clu = info->start_clu;
 542         ei->flags = info->flags;
 543         ei->type = info->type;
 544
 545         ei->version = 0;
 546         ei->hint_stat.eidx = 0;
 547         ei->hint_stat.clu = info->start_clu;
 548         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 549         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 550         ei->i_pos = 0;
 551
 552         inode->i_uid = sbi->options.fs_uid;
 553         inode->i_gid = sbi->options.fs_gid;
 554         inode_inc_iversion(inode);
 555         inode->i_generation = get_random_u32();
 556
 557         if (info->attr & ATTR_SUBDIR) { /* directory */
 558                 inode->i_generation &= ~1;
 559                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 560                 inode->i_op = &exfat_dir_inode_operations;
 561                 inode->i_fop = &exfat_dir_operations;
 562                 set_nlink(inode, info->num_subdirs);
 563         } else { /* regular file */
 564                 inode->i_generation |= 1;
 565                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 566                 inode->i_op = &exfat_file_inode_operations;
 567                 inode->i_fop = &exfat_file_operations;
 568                 inode->i_mapping->a_ops = &exfat_aops;
 569                 inode->i_mapping->nrpages = 0;
 570         }
 571
 572         i_size_write(inode, size);
 573
 574         /* ondisk and aligned size should be aligned with block size */
 575         if (size & (inode->i_sb->s_blocksize - 1)) {
 576                 size |= (inode->i_sb->s_blocksize - 1);
 577                 size++;
 578         }
 579
 580         ei->i_size_aligned = size;
 581         ei->i_size_ondisk = size;
 582
 583         exfat_save_attr(inode, info->attr);
 584
 585         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
 586                                 inode->i_blkbits;
 587         inode->i_mtime = info->mtime;
 588         inode->i_ctime = info->mtime;
 589         ei->i_crtime = info->crtime;
 590         inode->i_atime = info->atime;
 591
 592         return 0;
 593 }
 594
 595 struct inode *exfat_build_inode(struct super_block *sb,
 596                 struct exfat_dir_entry *info, loff_t i_pos)
 597 {
 598         struct inode *inode;
 599         int err;
 600
 601         inode = exfat_iget(sb, i_pos);
 602         if (inode)
 603                 goto out;
 604         inode = new_inode(sb);
 605         if (!inode) {
 606                 inode = ERR_PTR(-ENOMEM);
 607                 goto out;
 608         }
 609         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 610         inode_set_iversion(inode, 1);
 611         err = exfat_fill_inode(inode, info);
 612         if (err) {
 613                 iput(inode);
 614                 inode = ERR_PTR(err);
 615                 goto out;
 616         }
 617         exfat_hash_inode(inode, i_pos);
 618         insert_inode_hash(inode);
 619 out:
 620         return inode;
 621 }
 622
 623 void exfat_evict_inode(struct inode *inode)
 624 {
 625         truncate_inode_pages(&inode->i_data, 0);
 626
 627         if (!inode->i_nlink) {
 628                 i_size_write(inode, 0);
 629                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 630                 __exfat_truncate(inode, 0);
 631                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 632         }
 633
 634         invalidate_inode_buffers(inode);
 635         clear_inode(inode);
 636         exfat_cache_inval_inode(inode);
 637         exfat_unhash_inode(inode);
 638 }