fs/exfat/inode.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
   4  */
   5
   6 #include <linux/init.h>
   7 #include <linux/buffer_head.h>
   8 #include <linux/mpage.h>
   9 #include <linux/bio.h>
  10 #include <linux/blkdev.h>
  11 #include <linux/time.h>
  12 #include <linux/writeback.h>
  13 #include <linux/uio.h>
  14 #include <linux/random.h>
  15 #include <linux/iversion.h>
  16
  17 #include "exfat_raw.h"
  18 #include "exfat_fs.h"
  19
  20 int __exfat_write_inode(struct inode *inode, int sync)
  21 {
  22         unsigned long long on_disk_size;
  23         struct exfat_dentry *ep, *ep2;
  24         struct exfat_entry_set_cache es;
  25         struct super_block *sb = inode->i_sb;
  26         struct exfat_sb_info *sbi = EXFAT_SB(sb);
  27         struct exfat_inode_info *ei = EXFAT_I(inode);
  28         bool is_dir = (ei->type == TYPE_DIR) ? true : false;
  29         struct timespec64 ts;
  30
  31         if (inode->i_ino == EXFAT_ROOT_INO)
  32                 return 0;
  33
  34         /*
  35          * If the inode is already unlinked, there is no need for updating it.
  36          */
  37         if (ei->dir.dir == DIR_DELETED)
  38                 return 0;
  39
  40         if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1)
  41                 return 0;
  42
  43         exfat_set_volume_dirty(sb);
  44
  45         /* get the directory entry of given file or directory */
  46         if (exfat_get_dentry_set(&es, sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES))
  47                 return -EIO;
  48         ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
  49         ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
  50
  51         ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode));
  52
  53         /* set FILE_INFO structure using the acquired struct exfat_dentry */
  54         exfat_set_entry_time(sbi, &ei->i_crtime,
  55                         &ep->dentry.file.create_tz,
  56                         &ep->dentry.file.create_time,
  57                         &ep->dentry.file.create_date,
  58                         &ep->dentry.file.create_time_cs);
  59         ts = inode_get_mtime(inode);
  60         exfat_set_entry_time(sbi, &ts,
  61                              &ep->dentry.file.modify_tz,
  62                              &ep->dentry.file.modify_time,
  63                              &ep->dentry.file.modify_date,
  64                              &ep->dentry.file.modify_time_cs);
  65         ts = inode_get_atime(inode);
  66         exfat_set_entry_time(sbi, &ts,
  67                              &ep->dentry.file.access_tz,
  68                              &ep->dentry.file.access_time,
  69                              &ep->dentry.file.access_date,
  70                              NULL);
  71
  72         /* File size should be zero if there is no cluster allocated */
  73         on_disk_size = i_size_read(inode);
  74
  75         if (ei->start_clu == EXFAT_EOF_CLUSTER)
  76                 on_disk_size = 0;
  77
  78         ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size);
  79         ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
  80         if (on_disk_size) {
  81                 ep2->dentry.stream.flags = ei->flags;
  82                 ep2->dentry.stream.start_clu = cpu_to_le32(ei->start_clu);
  83         } else {
  84                 ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
  85                 ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
  86         }
  87
  88         exfat_update_dir_chksum_with_entry_set(&es);
  89         return exfat_put_dentry_set(&es, sync);
  90 }
  91
  92 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
  93 {
  94         int ret;
  95
  96         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
  97         ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
  98         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
  99
 100         return ret;
 101 }
 102
 103 void exfat_sync_inode(struct inode *inode)
 104 {
 105         lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock);
 106         __exfat_write_inode(inode, 1);
 107 }
 108
 109 /*
 110  * Input: inode, (logical) clu_offset, target allocation area
 111  * Output: errcode, cluster number
 112  * *clu = (~0), if it's unable to allocate a new cluster
 113  */
 114 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 115                 unsigned int *clu, int create)
 116 {
 117         int ret;
 118         unsigned int last_clu;
 119         struct exfat_chain new_clu;
 120         struct super_block *sb = inode->i_sb;
 121         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 122         struct exfat_inode_info *ei = EXFAT_I(inode);
 123         unsigned int local_clu_offset = clu_offset;
 124         unsigned int num_to_be_allocated = 0, num_clusters = 0;
 125
 126         if (ei->i_size_ondisk > 0)
 127                 num_clusters =
 128                         EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
 129
 130         if (clu_offset >= num_clusters)
 131                 num_to_be_allocated = clu_offset - num_clusters + 1;
 132
 133         if (!create && (num_to_be_allocated > 0)) {
 134                 *clu = EXFAT_EOF_CLUSTER;
 135                 return 0;
 136         }
 137
 138         *clu = last_clu = ei->start_clu;
 139
 140         if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 141                 if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 142                         last_clu += clu_offset - 1;
 143
 144                         if (clu_offset == num_clusters)
 145                                 *clu = EXFAT_EOF_CLUSTER;
 146                         else
 147                                 *clu += clu_offset;
 148                 }
 149         } else if (ei->type == TYPE_FILE) {
 150                 unsigned int fclus = 0;
 151                 int err = exfat_get_cluster(inode, clu_offset,
 152                                 &fclus, clu, &last_clu, 1);
 153                 if (err)
 154                         return -EIO;
 155
 156                 clu_offset -= fclus;
 157         } else {
 158                 /* hint information */
 159                 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER &&
 160                     ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) {
 161                         clu_offset -= ei->hint_bmap.off;
 162                         /* hint_bmap.clu should be valid */
 163                         WARN_ON(ei->hint_bmap.clu < 2);
 164                         *clu = ei->hint_bmap.clu;
 165                 }
 166
 167                 while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
 168                         last_clu = *clu;
 169                         if (exfat_get_next_cluster(sb, clu))
 170                                 return -EIO;
 171                         clu_offset--;
 172                 }
 173         }
 174
 175         if (*clu == EXFAT_EOF_CLUSTER) {
 176                 exfat_set_volume_dirty(sb);
 177
 178                 new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ?
 179                                 EXFAT_EOF_CLUSTER : last_clu + 1;
 180                 new_clu.size = 0;
 181                 new_clu.flags = ei->flags;
 182
 183                 /* allocate a cluster */
 184                 if (num_to_be_allocated < 1) {
 185                         /* Broken FAT (i_sze > allocated FAT) */
 186                         exfat_fs_error(sb, "broken FAT chain.");
 187                         return -EIO;
 188                 }
 189
 190                 ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu,
 191                                 inode_needs_sync(inode));
 192                 if (ret)
 193                         return ret;
 194
 195                 if (new_clu.dir == EXFAT_EOF_CLUSTER ||
 196                     new_clu.dir == EXFAT_FREE_CLUSTER) {
 197                         exfat_fs_error(sb,
 198                                 "bogus cluster new allocated (last_clu : %u, new_clu : %u)",
 199                                 last_clu, new_clu.dir);
 200                         return -EIO;
 201                 }
 202
 203                 /* append to the FAT chain */
 204                 if (last_clu == EXFAT_EOF_CLUSTER) {
 205                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 206                                 ei->flags = ALLOC_FAT_CHAIN;
 207                         ei->start_clu = new_clu.dir;
 208                 } else {
 209                         if (new_clu.flags != ei->flags) {
 210                                 /* no-fat-chain bit is disabled,
 211                                  * so fat-chain should be synced with
 212                                  * alloc-bitmap
 213                                  */
 214                                 exfat_chain_cont_cluster(sb, ei->start_clu,
 215                                         num_clusters);
 216                                 ei->flags = ALLOC_FAT_CHAIN;
 217                         }
 218                         if (new_clu.flags == ALLOC_FAT_CHAIN)
 219                                 if (exfat_ent_set(sb, last_clu, new_clu.dir))
 220                                         return -EIO;
 221                 }
 222
 223                 num_clusters += num_to_be_allocated;
 224                 *clu = new_clu.dir;
 225
 226                 inode->i_blocks += EXFAT_CLU_TO_B(num_to_be_allocated, sbi) >> 9;
 227
 228                 /*
 229                  * Move *clu pointer along FAT chains (hole care) because the
 230                  * caller of this function expect *clu to be the last cluster.
 231                  * This only works when num_to_be_allocated >= 2,
 232                  * *clu = (the first cluster of the allocated chain) =>
 233                  * (the last cluster of ...)
 234                  */
 235                 if (ei->flags == ALLOC_NO_FAT_CHAIN) {
 236                         *clu += num_to_be_allocated - 1;
 237                 } else {
 238                         while (num_to_be_allocated > 1) {
 239                                 if (exfat_get_next_cluster(sb, clu))
 240                                         return -EIO;
 241                                 num_to_be_allocated--;
 242                         }
 243                 }
 244
 245         }
 246
 247         /* hint information */
 248         ei->hint_bmap.off = local_clu_offset;
 249         ei->hint_bmap.clu = *clu;
 250
 251         return 0;
 252 }
 253
 254 static int exfat_map_new_buffer(struct exfat_inode_info *ei,
 255                 struct buffer_head *bh, loff_t pos)
 256 {
 257         if (buffer_delay(bh) && pos > ei->i_size_aligned)
 258                 return -EIO;
 259         set_buffer_new(bh);
 260
 261         /*
 262          * Adjust i_size_aligned if i_size_ondisk is bigger than it.
 263          */
 264         if (ei->i_size_ondisk > ei->i_size_aligned)
 265                 ei->i_size_aligned = ei->i_size_ondisk;
 266         return 0;
 267 }
 268
 269 static int exfat_get_block(struct inode *inode, sector_t iblock,
 270                 struct buffer_head *bh_result, int create)
 271 {
 272         struct exfat_inode_info *ei = EXFAT_I(inode);
 273         struct super_block *sb = inode->i_sb;
 274         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 275         unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 276         int err = 0;
 277         unsigned long mapped_blocks = 0;
 278         unsigned int cluster, sec_offset;
 279         sector_t last_block;
 280         sector_t phys = 0;
 281         loff_t pos;
 282
 283         mutex_lock(&sbi->s_lock);
 284         last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb);
 285         if (iblock >= last_block && !create)
 286                 goto done;
 287
 288         /* Is this block already allocated? */
 289         err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
 290                         &cluster, create);
 291         if (err) {
 292                 if (err != -ENOSPC)
 293                         exfat_fs_error_ratelimit(sb,
 294                                 "failed to bmap (inode : %p iblock : %llu, err : %d)",
 295                                 inode, (unsigned long long)iblock, err);
 296                 goto unlock_ret;
 297         }
 298
 299         if (cluster == EXFAT_EOF_CLUSTER)
 300                 goto done;
 301
 302         /* sector offset in cluster */
 303         sec_offset = iblock & (sbi->sect_per_clus - 1);
 304
 305         phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
 306         mapped_blocks = sbi->sect_per_clus - sec_offset;
 307         max_blocks = min(mapped_blocks, max_blocks);
 308
 309         /* Treat newly added block / cluster */
 310         if (iblock < last_block)
 311                 create = 0;
 312
 313         if (create || buffer_delay(bh_result)) {
 314                 pos = EXFAT_BLK_TO_B((iblock + 1), sb);
 315                 if (ei->i_size_ondisk < pos)
 316                         ei->i_size_ondisk = pos;
 317         }
 318
 319         if (create) {
 320                 err = exfat_map_new_buffer(ei, bh_result, pos);
 321                 if (err) {
 322                         exfat_fs_error(sb,
 323                                         "requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n",
 324                                         pos, ei->i_size_aligned);
 325                         goto unlock_ret;
 326                 }
 327         }
 328
 329         if (buffer_delay(bh_result))
 330                 clear_buffer_delay(bh_result);
 331         map_bh(bh_result, sb, phys);
 332 done:
 333         bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb);
 334 unlock_ret:
 335         mutex_unlock(&sbi->s_lock);
 336         return err;
 337 }
 338
 339 static int exfat_read_folio(struct file *file, struct folio *folio)
 340 {
 341         return mpage_read_folio(folio, exfat_get_block);
 342 }
 343
 344 static void exfat_readahead(struct readahead_control *rac)
 345 {
 346         mpage_readahead(rac, exfat_get_block);
 347 }
 348
 349 static int exfat_writepages(struct address_space *mapping,
 350                 struct writeback_control *wbc)
 351 {
 352         return mpage_writepages(mapping, wbc, exfat_get_block);
 353 }
 354
 355 static void exfat_write_failed(struct address_space *mapping, loff_t to)
 356 {
 357         struct inode *inode = mapping->host;
 358
 359         if (to > i_size_read(inode)) {
 360                 truncate_pagecache(inode, i_size_read(inode));
 361                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 362                 exfat_truncate(inode);
 363         }
 364 }
 365
 366 static int exfat_write_begin(struct file *file, struct address_space *mapping,
 367                 loff_t pos, unsigned int len,
 368                 struct page **pagep, void **fsdata)
 369 {
 370         int ret;
 371
 372         *pagep = NULL;
 373         ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
 374                                exfat_get_block,
 375                                &EXFAT_I(mapping->host)->i_size_ondisk);
 376
 377         if (ret < 0)
 378                 exfat_write_failed(mapping, pos+len);
 379
 380         return ret;
 381 }
 382
 383 static int exfat_write_end(struct file *file, struct address_space *mapping,
 384                 loff_t pos, unsigned int len, unsigned int copied,
 385                 struct page *pagep, void *fsdata)
 386 {
 387         struct inode *inode = mapping->host;
 388         struct exfat_inode_info *ei = EXFAT_I(inode);
 389         int err;
 390
 391         err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 392
 393         if (ei->i_size_aligned < i_size_read(inode)) {
 394                 exfat_fs_error(inode->i_sb,
 395                         "invalid size(size(%llu) > aligned(%llu)\n",
 396                         i_size_read(inode), ei->i_size_aligned);
 397                 return -EIO;
 398         }
 399
 400         if (err < len)
 401                 exfat_write_failed(mapping, pos+len);
 402
 403         if (!(err < 0) && !(ei->attr & EXFAT_ATTR_ARCHIVE)) {
 404                 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
 405                 ei->attr |= EXFAT_ATTR_ARCHIVE;
 406                 mark_inode_dirty(inode);
 407         }
 408
 409         return err;
 410 }
 411
 412 static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
 413 {
 414         struct address_space *mapping = iocb->ki_filp->f_mapping;
 415         struct inode *inode = mapping->host;
 416         loff_t size = iocb->ki_pos + iov_iter_count(iter);
 417         int rw = iov_iter_rw(iter);
 418         ssize_t ret;
 419
 420         if (rw == WRITE) {
 421                 /*
 422                  * FIXME: blockdev_direct_IO() doesn't use ->write_begin(),
 423                  * so we need to update the ->i_size_aligned to block boundary.
 424                  *
 425                  * But we must fill the remaining area or hole by nul for
 426                  * updating ->i_size_aligned
 427                  *
 428                  * Return 0, and fallback to normal buffered write.
 429                  */
 430                 if (EXFAT_I(inode)->i_size_aligned < size)
 431                         return 0;
 432         }
 433
 434         /*
 435          * Need to use the DIO_LOCKING for avoiding the race
 436          * condition of exfat_get_block() and ->truncate().
 437          */
 438         ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block);
 439         if (ret < 0 && (rw & WRITE))
 440                 exfat_write_failed(mapping, size);
 441         return ret;
 442 }
 443
 444 static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
 445 {
 446         sector_t blocknr;
 447
 448         /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
 449         down_read(&EXFAT_I(mapping->host)->truncate_lock);
 450         blocknr = generic_block_bmap(mapping, block, exfat_get_block);
 451         up_read(&EXFAT_I(mapping->host)->truncate_lock);
 452         return blocknr;
 453 }
 454
 455 /*
 456  * exfat_block_truncate_page() zeroes out a mapping from file offset `from'
 457  * up to the end of the block which corresponds to `from'.
 458  * This is required during truncate to physically zeroout the tail end
 459  * of that block so it doesn't yield old data if the file is later grown.
 460  * Also, avoid causing failure from fsx for cases of "data past EOF"
 461  */
 462 int exfat_block_truncate_page(struct inode *inode, loff_t from)
 463 {
 464         return block_truncate_page(inode->i_mapping, from, exfat_get_block);
 465 }
 466
 467 static const struct address_space_operations exfat_aops = {
 468         .dirty_folio    = block_dirty_folio,
 469         .invalidate_folio = block_invalidate_folio,
 470         .read_folio     = exfat_read_folio,
 471         .readahead      = exfat_readahead,
 472         .writepages     = exfat_writepages,
 473         .write_begin    = exfat_write_begin,
 474         .write_end      = exfat_write_end,
 475         .direct_IO      = exfat_direct_IO,
 476         .bmap           = exfat_aop_bmap,
 477         .migrate_folio  = buffer_migrate_folio,
 478 };
 479
 480 static inline unsigned long exfat_hash(loff_t i_pos)
 481 {
 482         return hash_32(i_pos, EXFAT_HASH_BITS);
 483 }
 484
 485 void exfat_hash_inode(struct inode *inode, loff_t i_pos)
 486 {
 487         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 488         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 489
 490         spin_lock(&sbi->inode_hash_lock);
 491         EXFAT_I(inode)->i_pos = i_pos;
 492         hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head);
 493         spin_unlock(&sbi->inode_hash_lock);
 494 }
 495
 496 void exfat_unhash_inode(struct inode *inode)
 497 {
 498         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 499
 500         spin_lock(&sbi->inode_hash_lock);
 501         hlist_del_init(&EXFAT_I(inode)->i_hash_fat);
 502         EXFAT_I(inode)->i_pos = 0;
 503         spin_unlock(&sbi->inode_hash_lock);
 504 }
 505
 506 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos)
 507 {
 508         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 509         struct exfat_inode_info *info;
 510         struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos);
 511         struct inode *inode = NULL;
 512
 513         spin_lock(&sbi->inode_hash_lock);
 514         hlist_for_each_entry(info, head, i_hash_fat) {
 515                 WARN_ON(info->vfs_inode.i_sb != sb);
 516
 517                 if (i_pos != info->i_pos)
 518                         continue;
 519                 inode = igrab(&info->vfs_inode);
 520                 if (inode)
 521                         break;
 522         }
 523         spin_unlock(&sbi->inode_hash_lock);
 524         return inode;
 525 }
 526
 527 /* doesn't deal with root inode */
 528 static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info)
 529 {
 530         struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
 531         struct exfat_inode_info *ei = EXFAT_I(inode);
 532         loff_t size = info->size;
 533
 534         ei->dir = info->dir;
 535         ei->entry = info->entry;
 536         ei->attr = info->attr;
 537         ei->start_clu = info->start_clu;
 538         ei->flags = info->flags;
 539         ei->type = info->type;
 540
 541         ei->version = 0;
 542         ei->hint_stat.eidx = 0;
 543         ei->hint_stat.clu = info->start_clu;
 544         ei->hint_femp.eidx = EXFAT_HINT_NONE;
 545         ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
 546         ei->i_pos = 0;
 547
 548         inode->i_uid = sbi->options.fs_uid;
 549         inode->i_gid = sbi->options.fs_gid;
 550         inode_inc_iversion(inode);
 551         inode->i_generation = get_random_u32();
 552
 553         if (info->attr & EXFAT_ATTR_SUBDIR) { /* directory */
 554                 inode->i_generation &= ~1;
 555                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 556                 inode->i_op = &exfat_dir_inode_operations;
 557                 inode->i_fop = &exfat_dir_operations;
 558                 set_nlink(inode, info->num_subdirs);
 559         } else { /* regular file */
 560                 inode->i_generation |= 1;
 561                 inode->i_mode = exfat_make_mode(sbi, info->attr, 0777);
 562                 inode->i_op = &exfat_file_inode_operations;
 563                 inode->i_fop = &exfat_file_operations;
 564                 inode->i_mapping->a_ops = &exfat_aops;
 565                 inode->i_mapping->nrpages = 0;
 566         }
 567
 568         i_size_write(inode, size);
 569
 570         /* ondisk and aligned size should be aligned with block size */
 571         if (size & (inode->i_sb->s_blocksize - 1)) {
 572                 size |= (inode->i_sb->s_blocksize - 1);
 573                 size++;
 574         }
 575
 576         ei->i_size_aligned = size;
 577         ei->i_size_ondisk = size;
 578
 579         exfat_save_attr(inode, info->attr);
 580
 581         inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >> 9;
 582         inode_set_mtime_to_ts(inode, info->mtime);
 583         inode_set_ctime_to_ts(inode, info->mtime);
 584         ei->i_crtime = info->crtime;
 585         inode_set_atime_to_ts(inode, info->atime);
 586
 587         return 0;
 588 }
 589
 590 struct inode *exfat_build_inode(struct super_block *sb,
 591                 struct exfat_dir_entry *info, loff_t i_pos)
 592 {
 593         struct inode *inode;
 594         int err;
 595
 596         inode = exfat_iget(sb, i_pos);
 597         if (inode)
 598                 goto out;
 599         inode = new_inode(sb);
 600         if (!inode) {
 601                 inode = ERR_PTR(-ENOMEM);
 602                 goto out;
 603         }
 604         inode->i_ino = iunique(sb, EXFAT_ROOT_INO);
 605         inode_set_iversion(inode, 1);
 606         err = exfat_fill_inode(inode, info);
 607         if (err) {
 608                 iput(inode);
 609                 inode = ERR_PTR(err);
 610                 goto out;
 611         }
 612         exfat_hash_inode(inode, i_pos);
 613         insert_inode_hash(inode);
 614 out:
 615         return inode;
 616 }
 617
 618 void exfat_evict_inode(struct inode *inode)
 619 {
 620         truncate_inode_pages(&inode->i_data, 0);
 621
 622         if (!inode->i_nlink) {
 623                 i_size_write(inode, 0);
 624                 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 625                 __exfat_truncate(inode);
 626                 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 627         }
 628
 629         invalidate_inode_buffers(inode);
 630         clear_inode(inode);
 631         exfat_cache_inval_inode(inode);
 632         exfat_unhash_inode(inode);
 633 }