fs/exfat/namei.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/iversion.h>
   7 #include <linux/namei.h>
   8 #include <linux/slab.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/nls.h>
  11
  12 #include "exfat_raw.h"
  13 #include "exfat_fs.h"
  14
  15 static inline unsigned long exfat_d_version(struct dentry *dentry)
  16 {
  17         return (unsigned long) dentry->d_fsdata;
  18 }
  19
  20 static inline void exfat_d_version_set(struct dentry *dentry,
  21                 unsigned long version)
  22 {
  23         dentry->d_fsdata = (void *) version;
  24 }
  25
  26 /*
  27  * If new entry was created in the parent, it could create the 8.3 alias (the
  28  * shortname of logname).  So, the parent may have the negative-dentry which
  29  * matches the created 8.3 alias.
  30  *
  31  * If it happened, the negative dentry isn't actually negative anymore.  So,
  32  * drop it.
  33  */
  34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
  35 {
  36         int ret;
  37
  38         if (flags & LOOKUP_RCU)
  39                 return -ECHILD;
  40
  41         /*
  42          * This is not negative dentry. Always valid.
  43          *
  44          * Note, rename() to existing directory entry will have ->d_inode, and
  45          * will use existing name which isn't specified name by user.
  46          *
  47          * We may be able to drop this positive dentry here. But dropping
  48          * positive dentry isn't good idea. So it's unsupported like
  49          * rename("filename", "FILENAME") for now.
  50          */
  51         if (d_really_is_positive(dentry))
  52                 return 1;
  53
  54         /*
  55          * Drop the negative dentry, in order to make sure to use the case
  56          * sensitive name which is specified by user if this is for creation.
  57          */
  58         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
  59                 return 0;
  60
  61         spin_lock(&dentry->d_lock);
  62         ret = inode_eq_iversion(d_inode(dentry->d_parent),
  63                         exfat_d_version(dentry));
  64         spin_unlock(&dentry->d_lock);
  65         return ret;
  66 }
  67
  68 /* returns the length of a struct qstr, ignoring trailing dots */
  69 static unsigned int exfat_striptail_len(unsigned int len, const char *name)
  70 {
  71         while (len && name[len - 1] == '.')
  72                 len--;
  73         return len;
  74 }
  75
  76 /*
  77  * Compute the hash for the exfat name corresponding to the dentry.  If the name
  78  * is invalid, we leave the hash code unchanged so that the existing dentry can
  79  * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
  80  */
  81 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
  82 {
  83         struct super_block *sb = dentry->d_sb;
  84         struct nls_table *t = EXFAT_SB(sb)->nls_io;
  85         const unsigned char *name = qstr->name;
  86         unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
  87         unsigned long hash = init_name_hash(dentry);
  88         int i, charlen;
  89         wchar_t c;
  90
  91         for (i = 0; i < len; i += charlen) {
  92                 charlen = t->char2uni(&name[i], len - i, &c);
  93                 if (charlen < 0)
  94                         return charlen;
  95                 hash = partial_name_hash(exfat_toupper(sb, c), hash);
  96         }
  97
  98         qstr->hash = end_name_hash(hash);
  99         return 0;
 100 }
 101
 102 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
 103                 const char *str, const struct qstr *name)
 104 {
 105         struct super_block *sb = dentry->d_sb;
 106         struct nls_table *t = EXFAT_SB(sb)->nls_io;
 107         unsigned int alen = exfat_striptail_len(name->len, name->name);
 108         unsigned int blen = exfat_striptail_len(len, str);
 109         wchar_t c1, c2;
 110         int charlen, i;
 111
 112         if (alen != blen)
 113                 return 1;
 114
 115         for (i = 0; i < len; i += charlen) {
 116                 charlen = t->char2uni(&name->name[i], alen - i, &c1);
 117                 if (charlen < 0)
 118                         return 1;
 119                 if (charlen != t->char2uni(&str[i], blen - i, &c2))
 120                         return 1;
 121
 122                 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
 123                         return 1;
 124         }
 125
 126         return 0;
 127 }
 128
 129 const struct dentry_operations exfat_dentry_ops = {
 130         .d_revalidate   = exfat_d_revalidate,
 131         .d_hash         = exfat_d_hash,
 132         .d_compare      = exfat_d_cmp,
 133 };
 134
 135 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
 136 {
 137         struct super_block *sb = dentry->d_sb;
 138         const unsigned char *name = qstr->name;
 139         unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
 140         unsigned long hash = init_name_hash(dentry);
 141         int i, charlen;
 142         unicode_t u;
 143
 144         for (i = 0; i < len; i += charlen) {
 145                 charlen = utf8_to_utf32(&name[i], len - i, &u);
 146                 if (charlen < 0)
 147                         return charlen;
 148
 149                 /*
 150                  * exfat_toupper() works only for code points up to the U+FFFF.
 151                  */
 152                 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
 153                                          hash);
 154         }
 155
 156         qstr->hash = end_name_hash(hash);
 157         return 0;
 158 }
 159
 160 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
 161                 const char *str, const struct qstr *name)
 162 {
 163         struct super_block *sb = dentry->d_sb;
 164         unsigned int alen = exfat_striptail_len(name->len, name->name);
 165         unsigned int blen = exfat_striptail_len(len, str);
 166         unicode_t u_a, u_b;
 167         int charlen, i;
 168
 169         if (alen != blen)
 170                 return 1;
 171
 172         for (i = 0; i < alen; i += charlen) {
 173                 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
 174                 if (charlen < 0)
 175                         return 1;
 176                 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
 177                         return 1;
 178
 179                 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
 180                         if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
 181                                 return 1;
 182                 } else {
 183                         if (u_a != u_b)
 184                                 return 1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 const struct dentry_operations exfat_utf8_dentry_ops = {
 192         .d_revalidate   = exfat_d_revalidate,
 193         .d_hash         = exfat_utf8_d_hash,
 194         .d_compare      = exfat_utf8_d_cmp,
 195 };
 196
 197 /* used only in search empty_slot() */
 198 #define CNT_UNUSED_NOHIT        (-1)
 199 #define CNT_UNUSED_HIT          (-2)
 200 /* search EMPTY CONTINUOUS "num_entries" entries */
 201 static int exfat_search_empty_slot(struct super_block *sb,
 202                 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
 203                 int num_entries)
 204 {
 205         int i, dentry, num_empty = 0;
 206         int dentries_per_clu;
 207         unsigned int type;
 208         struct exfat_chain clu;
 209         struct exfat_dentry *ep;
 210         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 211         struct buffer_head *bh;
 212
 213         dentries_per_clu = sbi->dentries_per_clu;
 214
 215         if (hint_femp->eidx != EXFAT_HINT_NONE) {
 216                 dentry = hint_femp->eidx;
 217                 if (num_entries <= hint_femp->count) {
 218                         hint_femp->eidx = EXFAT_HINT_NONE;
 219                         return dentry;
 220                 }
 221
 222                 exfat_chain_dup(&clu, &hint_femp->cur);
 223         } else {
 224                 exfat_chain_dup(&clu, p_dir);
 225                 dentry = 0;
 226         }
 227
 228         while (clu.dir != EXFAT_EOF_CLUSTER) {
 229                 i = dentry & (dentries_per_clu - 1);
 230
 231                 for (; i < dentries_per_clu; i++, dentry++) {
 232                         ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
 233                         if (!ep)
 234                                 return -EIO;
 235                         type = exfat_get_entry_type(ep);
 236                         brelse(bh);
 237
 238                         if (type == TYPE_UNUSED || type == TYPE_DELETED) {
 239                                 num_empty++;
 240                                 if (hint_femp->eidx == EXFAT_HINT_NONE) {
 241                                         hint_femp->eidx = dentry;
 242                                         hint_femp->count = CNT_UNUSED_NOHIT;
 243                                         exfat_chain_set(&hint_femp->cur,
 244                                                 clu.dir, clu.size, clu.flags);
 245                                 }
 246
 247                                 if (type == TYPE_UNUSED &&
 248                                     hint_femp->count != CNT_UNUSED_HIT)
 249                                         hint_femp->count = CNT_UNUSED_HIT;
 250                         } else {
 251                                 if (hint_femp->eidx != EXFAT_HINT_NONE &&
 252                                     hint_femp->count == CNT_UNUSED_HIT) {
 253                                         /* unused empty group means
 254                                          * an empty group which includes
 255                                          * unused dentry
 256                                          */
 257                                         exfat_fs_error(sb,
 258                                                 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
 259                                                 dentry, hint_femp->eidx,
 260                                                 p_dir->dir, clu.dir);
 261                                         return -EIO;
 262                                 }
 263
 264                                 num_empty = 0;
 265                                 hint_femp->eidx = EXFAT_HINT_NONE;
 266                         }
 267
 268                         if (num_empty >= num_entries) {
 269                                 /* found and invalidate hint_femp */
 270                                 hint_femp->eidx = EXFAT_HINT_NONE;
 271                                 return (dentry - (num_entries - 1));
 272                         }
 273                 }
 274
 275                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 276                         if (--clu.size > 0)
 277                                 clu.dir++;
 278                         else
 279                                 clu.dir = EXFAT_EOF_CLUSTER;
 280                 } else {
 281                         if (exfat_get_next_cluster(sb, &clu.dir))
 282                                 return -EIO;
 283                 }
 284         }
 285
 286         return -ENOSPC;
 287 }
 288
 289 static int exfat_check_max_dentries(struct inode *inode)
 290 {
 291         if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
 292                 /*
 293                  * exFAT spec allows a dir to grow up to 8388608(256MB)
 294                  * dentries
 295                  */
 296                 return -ENOSPC;
 297         }
 298         return 0;
 299 }
 300
 301 /* find empty directory entry.
 302  * if there isn't any empty slot, expand cluster chain.
 303  */
 304 static int exfat_find_empty_entry(struct inode *inode,
 305                 struct exfat_chain *p_dir, int num_entries)
 306 {
 307         int dentry;
 308         unsigned int ret, last_clu;
 309         sector_t sector;
 310         loff_t size = 0;
 311         struct exfat_chain clu;
 312         struct exfat_dentry *ep = NULL;
 313         struct super_block *sb = inode->i_sb;
 314         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 315         struct exfat_inode_info *ei = EXFAT_I(inode);
 316         struct exfat_hint_femp hint_femp;
 317
 318         hint_femp.eidx = EXFAT_HINT_NONE;
 319
 320         if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
 321                 hint_femp = ei->hint_femp;
 322                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 323         }
 324
 325         while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
 326                                         num_entries)) < 0) {
 327                 if (dentry == -EIO)
 328                         break;
 329
 330                 if (exfat_check_max_dentries(inode))
 331                         return -ENOSPC;
 332
 333                 /* we trust p_dir->size regardless of FAT type */
 334                 if (exfat_find_last_cluster(sb, p_dir, &last_clu))
 335                         return -EIO;
 336
 337                 /*
 338                  * Allocate new cluster to this directory
 339                  */
 340                 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
 341
 342                 /* allocate a cluster */
 343                 ret = exfat_alloc_cluster(inode, 1, &clu);
 344                 if (ret)
 345                         return ret;
 346
 347                 if (exfat_zeroed_cluster(inode, clu.dir))
 348                         return -EIO;
 349
 350                 /* append to the FAT chain */
 351                 if (clu.flags != p_dir->flags) {
 352                         /* no-fat-chain bit is disabled,
 353                          * so fat-chain should be synced with alloc-bitmap
 354                          */
 355                         exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
 356                         p_dir->flags = ALLOC_FAT_CHAIN;
 357                         hint_femp.cur.flags = ALLOC_FAT_CHAIN;
 358                 }
 359
 360                 if (clu.flags == ALLOC_FAT_CHAIN)
 361                         if (exfat_ent_set(sb, last_clu, clu.dir))
 362                                 return -EIO;
 363
 364                 if (hint_femp.eidx == EXFAT_HINT_NONE) {
 365                         /* the special case that new dentry
 366                          * should be allocated from the start of new cluster
 367                          */
 368                         hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
 369                         hint_femp.count = sbi->dentries_per_clu;
 370
 371                         exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
 372                 }
 373                 hint_femp.cur.size++;
 374                 p_dir->size++;
 375                 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
 376
 377                 /* update the directory entry */
 378                 if (p_dir->dir != sbi->root_dir) {
 379                         struct buffer_head *bh;
 380
 381                         ep = exfat_get_dentry(sb,
 382                                 &(ei->dir), ei->entry + 1, &bh, &sector);
 383                         if (!ep)
 384                                 return -EIO;
 385
 386                         ep->dentry.stream.valid_size = cpu_to_le64(size);
 387                         ep->dentry.stream.size = ep->dentry.stream.valid_size;
 388                         ep->dentry.stream.flags = p_dir->flags;
 389                         exfat_update_bh(bh, IS_DIRSYNC(inode));
 390                         brelse(bh);
 391                         if (exfat_update_dir_chksum(inode, &(ei->dir),
 392                             ei->entry))
 393                                 return -EIO;
 394                 }
 395
 396                 /* directory inode should be updated in here */
 397                 i_size_write(inode, size);
 398                 EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
 399                 EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
 400                 EXFAT_I(inode)->flags = p_dir->flags;
 401                 inode->i_blocks += 1 << sbi->sect_per_clus_bits;
 402         }
 403
 404         return dentry;
 405 }
 406
 407 /*
 408  * Name Resolution Functions :
 409  * Zero if it was successful; otherwise nonzero.
 410  */
 411 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
 412                 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
 413                 int lookup)
 414 {
 415         int namelen;
 416         int lossy = NLS_NAME_NO_LOSSY;
 417         struct super_block *sb = inode->i_sb;
 418         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 419         struct exfat_inode_info *ei = EXFAT_I(inode);
 420
 421         /* strip all trailing periods */
 422         namelen = exfat_striptail_len(strlen(path), path);
 423         if (!namelen)
 424                 return -ENOENT;
 425
 426         if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
 427                 return -ENAMETOOLONG;
 428
 429         /*
 430          * strip all leading spaces :
 431          * "MS windows 7" supports leading spaces.
 432          * So we should skip this preprocessing for compatibility.
 433          */
 434
 435         /* file name conversion :
 436          * If lookup case, we allow bad-name for compatibility.
 437          */
 438         namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
 439                         &lossy);
 440         if (namelen < 0)
 441                 return namelen; /* return error value */
 442
 443         if ((lossy && !lookup) || !namelen)
 444                 return -EINVAL;
 445
 446         exfat_chain_set(p_dir, ei->start_clu,
 447                 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
 448
 449         return 0;
 450 }
 451
 452 static inline int exfat_resolve_path(struct inode *inode,
 453                 const unsigned char *path, struct exfat_chain *dir,
 454                 struct exfat_uni_name *uni)
 455 {
 456         return __exfat_resolve_path(inode, path, dir, uni, 0);
 457 }
 458
 459 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
 460                 const unsigned char *path, struct exfat_chain *dir,
 461                 struct exfat_uni_name *uni)
 462 {
 463         return __exfat_resolve_path(inode, path, dir, uni, 1);
 464 }
 465
 466 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
 467 {
 468         return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
 469 }
 470
 471 static int exfat_add_entry(struct inode *inode, const char *path,
 472                 struct exfat_chain *p_dir, unsigned int type,
 473                 struct exfat_dir_entry *info)
 474 {
 475         int ret, dentry, num_entries;
 476         struct super_block *sb = inode->i_sb;
 477         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 478         struct exfat_uni_name uniname;
 479         struct exfat_chain clu;
 480         int clu_size = 0;
 481         unsigned int start_clu = EXFAT_FREE_CLUSTER;
 482
 483         ret = exfat_resolve_path(inode, path, p_dir, &uniname);
 484         if (ret)
 485                 goto out;
 486
 487         num_entries = exfat_calc_num_entries(&uniname);
 488         if (num_entries < 0) {
 489                 ret = num_entries;
 490                 goto out;
 491         }
 492
 493         /* exfat_find_empty_entry must be called before alloc_cluster() */
 494         dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
 495         if (dentry < 0) {
 496                 ret = dentry; /* -EIO or -ENOSPC */
 497                 goto out;
 498         }
 499
 500         if (type == TYPE_DIR) {
 501                 ret = exfat_alloc_new_dir(inode, &clu);
 502                 if (ret)
 503                         goto out;
 504                 start_clu = clu.dir;
 505                 clu_size = sbi->cluster_size;
 506         }
 507
 508         /* update the directory entry */
 509         /* fill the dos name directory entry information of the created file.
 510          * the first cluster is not determined yet. (0)
 511          */
 512         ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
 513                 start_clu, clu_size);
 514         if (ret)
 515                 goto out;
 516
 517         ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
 518         if (ret)
 519                 goto out;
 520
 521         info->dir = *p_dir;
 522         info->entry = dentry;
 523         info->flags = ALLOC_NO_FAT_CHAIN;
 524         info->type = type;
 525
 526         if (type == TYPE_FILE) {
 527                 info->attr = ATTR_ARCHIVE;
 528                 info->start_clu = EXFAT_EOF_CLUSTER;
 529                 info->size = 0;
 530                 info->num_subdirs = 0;
 531         } else {
 532                 info->attr = ATTR_SUBDIR;
 533                 info->start_clu = start_clu;
 534                 info->size = clu_size;
 535                 info->num_subdirs = EXFAT_MIN_SUBDIR;
 536         }
 537         memset(&info->crtime, 0, sizeof(info->crtime));
 538         memset(&info->mtime, 0, sizeof(info->mtime));
 539         memset(&info->atime, 0, sizeof(info->atime));
 540 out:
 541         return ret;
 542 }
 543
 544 static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 545                 bool excl)
 546 {
 547         struct super_block *sb = dir->i_sb;
 548         struct inode *inode;
 549         struct exfat_chain cdir;
 550         struct exfat_dir_entry info;
 551         loff_t i_pos;
 552         int err;
 553
 554         mutex_lock(&EXFAT_SB(sb)->s_lock);
 555         exfat_set_volume_dirty(sb);
 556         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
 557                 &info);
 558         exfat_clear_volume_dirty(sb);
 559         if (err)
 560                 goto unlock;
 561
 562         inode_inc_iversion(dir);
 563         dir->i_ctime = dir->i_mtime = current_time(dir);
 564         if (IS_DIRSYNC(dir))
 565                 exfat_sync_inode(dir);
 566         else
 567                 mark_inode_dirty(dir);
 568
 569         i_pos = exfat_make_i_pos(&info);
 570         inode = exfat_build_inode(sb, &info, i_pos);
 571         err = PTR_ERR_OR_ZERO(inode);
 572         if (err)
 573                 goto unlock;
 574
 575         inode_inc_iversion(inode);
 576         inode->i_mtime = inode->i_atime = inode->i_ctime =
 577                 EXFAT_I(inode)->i_crtime = current_time(inode);
 578         exfat_truncate_atime(&inode->i_atime);
 579         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 580
 581         d_instantiate(dentry, inode);
 582 unlock:
 583         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 584         return err;
 585 }
 586
 587 /* lookup a file */
 588 static int exfat_find(struct inode *dir, struct qstr *qname,
 589                 struct exfat_dir_entry *info)
 590 {
 591         int ret, dentry, num_entries, count;
 592         struct exfat_chain cdir;
 593         struct exfat_uni_name uni_name;
 594         struct super_block *sb = dir->i_sb;
 595         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 596         struct exfat_inode_info *ei = EXFAT_I(dir);
 597         struct exfat_dentry *ep, *ep2;
 598         struct exfat_entry_set_cache *es;
 599
 600         if (qname->len == 0)
 601                 return -ENOENT;
 602
 603         /* check the validity of directory name in the given pathname */
 604         ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
 605         if (ret)
 606                 return ret;
 607
 608         num_entries = exfat_calc_num_entries(&uni_name);
 609         if (num_entries < 0)
 610                 return num_entries;
 611
 612         /* check the validation of hint_stat and initialize it if required */
 613         if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
 614                 ei->hint_stat.clu = cdir.dir;
 615                 ei->hint_stat.eidx = 0;
 616                 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
 617                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 618         }
 619
 620         /* search the file name for directories */
 621         dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
 622                         num_entries, TYPE_ALL);
 623
 624         if (dentry < 0)
 625                 return dentry; /* -error value */
 626
 627         info->dir = cdir;
 628         info->entry = dentry;
 629         info->num_subdirs = 0;
 630
 631         es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
 632         if (!es)
 633                 return -EIO;
 634         ep = exfat_get_dentry_cached(es, 0);
 635         ep2 = exfat_get_dentry_cached(es, 1);
 636
 637         info->type = exfat_get_entry_type(ep);
 638         info->attr = le16_to_cpu(ep->dentry.file.attr);
 639         info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
 640         if ((info->type == TYPE_FILE) && (info->size == 0)) {
 641                 info->flags = ALLOC_NO_FAT_CHAIN;
 642                 info->start_clu = EXFAT_EOF_CLUSTER;
 643         } else {
 644                 info->flags = ep2->dentry.stream.flags;
 645                 info->start_clu =
 646                         le32_to_cpu(ep2->dentry.stream.start_clu);
 647         }
 648
 649         exfat_get_entry_time(sbi, &info->crtime,
 650                              ep->dentry.file.create_tz,
 651                              ep->dentry.file.create_time,
 652                              ep->dentry.file.create_date,
 653                              ep->dentry.file.create_time_cs);
 654         exfat_get_entry_time(sbi, &info->mtime,
 655                              ep->dentry.file.modify_tz,
 656                              ep->dentry.file.modify_time,
 657                              ep->dentry.file.modify_date,
 658                              ep->dentry.file.modify_time_cs);
 659         exfat_get_entry_time(sbi, &info->atime,
 660                              ep->dentry.file.access_tz,
 661                              ep->dentry.file.access_time,
 662                              ep->dentry.file.access_date,
 663                              0);
 664         exfat_free_dentry_set(es, false);
 665
 666         if (ei->start_clu == EXFAT_FREE_CLUSTER) {
 667                 exfat_fs_error(sb,
 668                                "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
 669                                i_size_read(dir), ei->dir.dir, ei->entry);
 670                 return -EIO;
 671         }
 672
 673         if (info->type == TYPE_DIR) {
 674                 exfat_chain_set(&cdir, info->start_clu,
 675                                 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
 676                 count = exfat_count_dir_entries(sb, &cdir);
 677                 if (count < 0)
 678                         return -EIO;
 679
 680                 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
 681         }
 682         return 0;
 683 }
 684
 685 static int exfat_d_anon_disconn(struct dentry *dentry)
 686 {
 687         return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
 688 }
 689
 690 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
 691                 unsigned int flags)
 692 {
 693         struct super_block *sb = dir->i_sb;
 694         struct inode *inode;
 695         struct dentry *alias;
 696         struct exfat_dir_entry info;
 697         int err;
 698         loff_t i_pos;
 699         mode_t i_mode;
 700
 701         mutex_lock(&EXFAT_SB(sb)->s_lock);
 702         err = exfat_find(dir, &dentry->d_name, &info);
 703         if (err) {
 704                 if (err == -ENOENT) {
 705                         inode = NULL;
 706                         goto out;
 707                 }
 708                 goto unlock;
 709         }
 710
 711         i_pos = exfat_make_i_pos(&info);
 712         inode = exfat_build_inode(sb, &info, i_pos);
 713         err = PTR_ERR_OR_ZERO(inode);
 714         if (err)
 715                 goto unlock;
 716
 717         i_mode = inode->i_mode;
 718         alias = d_find_alias(inode);
 719
 720         /*
 721          * Checking "alias->d_parent == dentry->d_parent" to make sure
 722          * FS is not corrupted (especially double linked dir).
 723          */
 724         if (alias && alias->d_parent == dentry->d_parent &&
 725                         !exfat_d_anon_disconn(alias)) {
 726
 727                 /*
 728                  * Unhashed alias is able to exist because of revalidate()
 729                  * called by lookup_fast. You can easily make this status
 730                  * by calling create and lookup concurrently
 731                  * In such case, we reuse an alias instead of new dentry
 732                  */
 733                 if (d_unhashed(alias)) {
 734                         WARN_ON(alias->d_name.hash_len !=
 735                                 dentry->d_name.hash_len);
 736                         exfat_info(sb, "rehashed a dentry(%p) in read lookup",
 737                                    alias);
 738                         d_drop(dentry);
 739                         d_rehash(alias);
 740                 } else if (!S_ISDIR(i_mode)) {
 741                         /*
 742                          * This inode has non anonymous-DCACHE_DISCONNECTED
 743                          * dentry. This means, the user did ->lookup() by an
 744                          * another name (longname vs 8.3 alias of it) in past.
 745                          *
 746                          * Switch to new one for reason of locality if possible.
 747                          */
 748                         d_move(alias, dentry);
 749                 }
 750                 iput(inode);
 751                 mutex_unlock(&EXFAT_SB(sb)->s_lock);
 752                 return alias;
 753         }
 754         dput(alias);
 755 out:
 756         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 757         if (!inode)
 758                 exfat_d_version_set(dentry, inode_query_iversion(dir));
 759
 760         return d_splice_alias(inode, dentry);
 761 unlock:
 762         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 763         return ERR_PTR(err);
 764 }
 765
 766 /* remove an entry, BUT don't truncate */
 767 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
 768 {
 769         struct exfat_chain cdir;
 770         struct exfat_dentry *ep;
 771         struct super_block *sb = dir->i_sb;
 772         struct inode *inode = dentry->d_inode;
 773         struct exfat_inode_info *ei = EXFAT_I(inode);
 774         struct buffer_head *bh;
 775         sector_t sector;
 776         int num_entries, entry, err = 0;
 777
 778         mutex_lock(&EXFAT_SB(sb)->s_lock);
 779         exfat_chain_dup(&cdir, &ei->dir);
 780         entry = ei->entry;
 781         if (ei->dir.dir == DIR_DELETED) {
 782                 exfat_err(sb, "abnormal access to deleted dentry");
 783                 err = -ENOENT;
 784                 goto unlock;
 785         }
 786
 787         ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
 788         if (!ep) {
 789                 err = -EIO;
 790                 goto unlock;
 791         }
 792         num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
 793         if (num_entries < 0) {
 794                 err = -EIO;
 795                 brelse(bh);
 796                 goto unlock;
 797         }
 798         num_entries++;
 799         brelse(bh);
 800
 801         exfat_set_volume_dirty(sb);
 802         /* update the directory entry */
 803         if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
 804                 err = -EIO;
 805                 goto unlock;
 806         }
 807
 808         /* This doesn't modify ei */
 809         ei->dir.dir = DIR_DELETED;
 810         exfat_clear_volume_dirty(sb);
 811
 812         inode_inc_iversion(dir);
 813         dir->i_mtime = dir->i_atime = current_time(dir);
 814         exfat_truncate_atime(&dir->i_atime);
 815         if (IS_DIRSYNC(dir))
 816                 exfat_sync_inode(dir);
 817         else
 818                 mark_inode_dirty(dir);
 819
 820         clear_nlink(inode);
 821         inode->i_mtime = inode->i_atime = current_time(inode);
 822         exfat_truncate_atime(&inode->i_atime);
 823         exfat_unhash_inode(inode);
 824         exfat_d_version_set(dentry, inode_query_iversion(dir));
 825 unlock:
 826         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 827         return err;
 828 }
 829
 830 static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 831 {
 832         struct super_block *sb = dir->i_sb;
 833         struct inode *inode;
 834         struct exfat_dir_entry info;
 835         struct exfat_chain cdir;
 836         loff_t i_pos;
 837         int err;
 838
 839         mutex_lock(&EXFAT_SB(sb)->s_lock);
 840         exfat_set_volume_dirty(sb);
 841         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
 842                 &info);
 843         exfat_clear_volume_dirty(sb);
 844         if (err)
 845                 goto unlock;
 846
 847         inode_inc_iversion(dir);
 848         dir->i_ctime = dir->i_mtime = current_time(dir);
 849         if (IS_DIRSYNC(dir))
 850                 exfat_sync_inode(dir);
 851         else
 852                 mark_inode_dirty(dir);
 853         inc_nlink(dir);
 854
 855         i_pos = exfat_make_i_pos(&info);
 856         inode = exfat_build_inode(sb, &info, i_pos);
 857         err = PTR_ERR_OR_ZERO(inode);
 858         if (err)
 859                 goto unlock;
 860
 861         inode_inc_iversion(inode);
 862         inode->i_mtime = inode->i_atime = inode->i_ctime =
 863                 EXFAT_I(inode)->i_crtime = current_time(inode);
 864         exfat_truncate_atime(&inode->i_atime);
 865         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 866
 867         d_instantiate(dentry, inode);
 868
 869 unlock:
 870         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 871         return err;
 872 }
 873
 874 static int exfat_check_dir_empty(struct super_block *sb,
 875                 struct exfat_chain *p_dir)
 876 {
 877         int i, dentries_per_clu;
 878         unsigned int type;
 879         struct exfat_chain clu;
 880         struct exfat_dentry *ep;
 881         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 882         struct buffer_head *bh;
 883
 884         dentries_per_clu = sbi->dentries_per_clu;
 885
 886         exfat_chain_dup(&clu, p_dir);
 887
 888         while (clu.dir != EXFAT_EOF_CLUSTER) {
 889                 for (i = 0; i < dentries_per_clu; i++) {
 890                         ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
 891                         if (!ep)
 892                                 return -EIO;
 893                         type = exfat_get_entry_type(ep);
 894                         brelse(bh);
 895                         if (type == TYPE_UNUSED)
 896                                 return 0;
 897
 898                         if (type != TYPE_FILE && type != TYPE_DIR)
 899                                 continue;
 900
 901                         return -ENOTEMPTY;
 902                 }
 903
 904                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 905                         if (--clu.size > 0)
 906                                 clu.dir++;
 907                         else
 908                                 clu.dir = EXFAT_EOF_CLUSTER;
 909                 } else {
 910                         if (exfat_get_next_cluster(sb, &(clu.dir)))
 911                                 return -EIO;
 912                 }
 913         }
 914
 915         return 0;
 916 }
 917
 918 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
 919 {
 920         struct inode *inode = dentry->d_inode;
 921         struct exfat_dentry *ep;
 922         struct exfat_chain cdir, clu_to_free;
 923         struct super_block *sb = inode->i_sb;
 924         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 925         struct exfat_inode_info *ei = EXFAT_I(inode);
 926         struct buffer_head *bh;
 927         sector_t sector;
 928         int num_entries, entry, err;
 929
 930         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 931
 932         exfat_chain_dup(&cdir, &ei->dir);
 933         entry = ei->entry;
 934
 935         if (ei->dir.dir == DIR_DELETED) {
 936                 exfat_err(sb, "abnormal access to deleted dentry");
 937                 err = -ENOENT;
 938                 goto unlock;
 939         }
 940
 941         exfat_chain_set(&clu_to_free, ei->start_clu,
 942                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
 943
 944         err = exfat_check_dir_empty(sb, &clu_to_free);
 945         if (err) {
 946                 if (err == -EIO)
 947                         exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
 948                                   err);
 949                 goto unlock;
 950         }
 951
 952         ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
 953         if (!ep) {
 954                 err = -EIO;
 955                 goto unlock;
 956         }
 957
 958         num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
 959         if (num_entries < 0) {
 960                 err = -EIO;
 961                 brelse(bh);
 962                 goto unlock;
 963         }
 964         num_entries++;
 965         brelse(bh);
 966
 967         exfat_set_volume_dirty(sb);
 968         err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
 969         if (err) {
 970                 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
 971                 goto unlock;
 972         }
 973         ei->dir.dir = DIR_DELETED;
 974         exfat_clear_volume_dirty(sb);
 975
 976         inode_inc_iversion(dir);
 977         dir->i_mtime = dir->i_atime = current_time(dir);
 978         exfat_truncate_atime(&dir->i_atime);
 979         if (IS_DIRSYNC(dir))
 980                 exfat_sync_inode(dir);
 981         else
 982                 mark_inode_dirty(dir);
 983         drop_nlink(dir);
 984
 985         clear_nlink(inode);
 986         inode->i_mtime = inode->i_atime = current_time(inode);
 987         exfat_truncate_atime(&inode->i_atime);
 988         exfat_unhash_inode(inode);
 989         exfat_d_version_set(dentry, inode_query_iversion(dir));
 990 unlock:
 991         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 992         return err;
 993 }
 994
 995 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 996                 int oldentry, struct exfat_uni_name *p_uniname,
 997                 struct exfat_inode_info *ei)
 998 {
 999         int ret, num_old_entries, num_new_entries;
1000         sector_t sector_old, sector_new;
1001         struct exfat_dentry *epold, *epnew;
1002         struct super_block *sb = inode->i_sb;
1003         struct buffer_head *new_bh, *old_bh;
1004         int sync = IS_DIRSYNC(inode);
1005
1006         epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, &sector_old);
1007         if (!epold)
1008                 return -EIO;
1009
1010         num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1011         if (num_old_entries < 0)
1012                 return -EIO;
1013         num_old_entries++;
1014
1015         num_new_entries = exfat_calc_num_entries(p_uniname);
1016         if (num_new_entries < 0)
1017                 return num_new_entries;
1018
1019         if (num_old_entries < num_new_entries) {
1020                 int newentry;
1021
1022                 newentry =
1023                         exfat_find_empty_entry(inode, p_dir, num_new_entries);
1024                 if (newentry < 0)
1025                         return newentry; /* -EIO or -ENOSPC */
1026
1027                 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh,
1028                         &sector_new);
1029                 if (!epnew)
1030                         return -EIO;
1031
1032                 *epnew = *epold;
1033                 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1034                         epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1035                         ei->attr |= ATTR_ARCHIVE;
1036                 }
1037                 exfat_update_bh(new_bh, sync);
1038                 brelse(old_bh);
1039                 brelse(new_bh);
1040
1041                 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
1042                         &sector_old);
1043                 if (!epold)
1044                         return -EIO;
1045                 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
1046                         &sector_new);
1047                 if (!epnew) {
1048                         brelse(old_bh);
1049                         return -EIO;
1050                 }
1051
1052                 *epnew = *epold;
1053                 exfat_update_bh(new_bh, sync);
1054                 brelse(old_bh);
1055                 brelse(new_bh);
1056
1057                 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1058                         num_new_entries, p_uniname);
1059                 if (ret)
1060                         return ret;
1061
1062                 exfat_remove_entries(inode, p_dir, oldentry, 0,
1063                         num_old_entries);
1064                 ei->entry = newentry;
1065         } else {
1066                 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1067                         epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1068                         ei->attr |= ATTR_ARCHIVE;
1069                 }
1070                 exfat_update_bh(old_bh, sync);
1071                 brelse(old_bh);
1072                 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1073                         num_new_entries, p_uniname);
1074                 if (ret)
1075                         return ret;
1076
1077                 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1078                         num_old_entries);
1079         }
1080         return 0;
1081 }
1082
1083 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1084                 int oldentry, struct exfat_chain *p_newdir,
1085                 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1086 {
1087         int ret, newentry, num_new_entries, num_old_entries;
1088         sector_t sector_mov, sector_new;
1089         struct exfat_dentry *epmov, *epnew;
1090         struct super_block *sb = inode->i_sb;
1091         struct buffer_head *mov_bh, *new_bh;
1092
1093         epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, &sector_mov);
1094         if (!epmov)
1095                 return -EIO;
1096
1097         num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1098                 epmov);
1099         if (num_old_entries < 0)
1100                 return -EIO;
1101         num_old_entries++;
1102
1103         num_new_entries = exfat_calc_num_entries(p_uniname);
1104         if (num_new_entries < 0)
1105                 return num_new_entries;
1106
1107         newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1108         if (newentry < 0)
1109                 return newentry; /* -EIO or -ENOSPC */
1110
1111         epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, &sector_new);
1112         if (!epnew)
1113                 return -EIO;
1114
1115         *epnew = *epmov;
1116         if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1117                 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1118                 ei->attr |= ATTR_ARCHIVE;
1119         }
1120         exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1121         brelse(mov_bh);
1122         brelse(new_bh);
1123
1124         epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
1125                 &sector_mov);
1126         if (!epmov)
1127                 return -EIO;
1128         epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
1129                 &sector_new);
1130         if (!epnew) {
1131                 brelse(mov_bh);
1132                 return -EIO;
1133         }
1134
1135         *epnew = *epmov;
1136         exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1137         brelse(mov_bh);
1138         brelse(new_bh);
1139
1140         ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1141                 p_uniname);
1142         if (ret)
1143                 return ret;
1144
1145         exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1146
1147         exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1148                 p_newdir->flags);
1149
1150         ei->entry = newentry;
1151         return 0;
1152 }
1153
1154 static void exfat_update_parent_info(struct exfat_inode_info *ei,
1155                 struct inode *parent_inode)
1156 {
1157         struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
1158         struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
1159         loff_t parent_isize = i_size_read(parent_inode);
1160
1161         /*
1162          * the problem that struct exfat_inode_info caches wrong parent info.
1163          *
1164          * because of flag-mismatch of ei->dir,
1165          * there is abnormal traversing cluster chain.
1166          */
1167         if (unlikely(parent_ei->flags != ei->dir.flags ||
1168                      parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
1169                      parent_ei->start_clu != ei->dir.dir)) {
1170                 exfat_chain_set(&ei->dir, parent_ei->start_clu,
1171                         EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
1172                         parent_ei->flags);
1173         }
1174 }
1175
1176 /* rename or move a old file into a new file */
1177 static int __exfat_rename(struct inode *old_parent_inode,
1178                 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1179                 struct dentry *new_dentry)
1180 {
1181         int ret;
1182         int dentry;
1183         struct exfat_chain olddir, newdir;
1184         struct exfat_chain *p_dir = NULL;
1185         struct exfat_uni_name uni_name;
1186         struct exfat_dentry *ep;
1187         struct super_block *sb = old_parent_inode->i_sb;
1188         struct exfat_sb_info *sbi = EXFAT_SB(sb);
1189         const unsigned char *new_path = new_dentry->d_name.name;
1190         struct inode *new_inode = new_dentry->d_inode;
1191         int num_entries;
1192         struct exfat_inode_info *new_ei = NULL;
1193         unsigned int new_entry_type = TYPE_UNUSED;
1194         int new_entry = 0;
1195         struct buffer_head *old_bh, *new_bh = NULL;
1196
1197         /* check the validity of pointer parameters */
1198         if (new_path == NULL || strlen(new_path) == 0)
1199                 return -EINVAL;
1200
1201         if (ei->dir.dir == DIR_DELETED) {
1202                 exfat_err(sb, "abnormal access to deleted source dentry");
1203                 return -ENOENT;
1204         }
1205
1206         exfat_update_parent_info(ei, old_parent_inode);
1207
1208         exfat_chain_dup(&olddir, &ei->dir);
1209         dentry = ei->entry;
1210
1211         ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
1212         if (!ep) {
1213                 ret = -EIO;
1214                 goto out;
1215         }
1216         brelse(old_bh);
1217
1218         /* check whether new dir is existing directory and empty */
1219         if (new_inode) {
1220                 ret = -EIO;
1221                 new_ei = EXFAT_I(new_inode);
1222
1223                 if (new_ei->dir.dir == DIR_DELETED) {
1224                         exfat_err(sb, "abnormal access to deleted target dentry");
1225                         goto out;
1226                 }
1227
1228                 exfat_update_parent_info(new_ei, new_parent_inode);
1229
1230                 p_dir = &(new_ei->dir);
1231                 new_entry = new_ei->entry;
1232                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1233                 if (!ep)
1234                         goto out;
1235
1236                 new_entry_type = exfat_get_entry_type(ep);
1237                 brelse(new_bh);
1238
1239                 /* if new_inode exists, update ei */
1240                 if (new_entry_type == TYPE_DIR) {
1241                         struct exfat_chain new_clu;
1242
1243                         new_clu.dir = new_ei->start_clu;
1244                         new_clu.size =
1245                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1246                                 sbi);
1247                         new_clu.flags = new_ei->flags;
1248
1249                         ret = exfat_check_dir_empty(sb, &new_clu);
1250                         if (ret)
1251                                 goto out;
1252                 }
1253         }
1254
1255         /* check the validity of directory name in the given new pathname */
1256         ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1257                         &uni_name);
1258         if (ret)
1259                 goto out;
1260
1261         exfat_set_volume_dirty(sb);
1262
1263         if (olddir.dir == newdir.dir)
1264                 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1265                                 &uni_name, ei);
1266         else
1267                 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1268                                 &newdir, &uni_name, ei);
1269
1270         if (!ret && new_inode) {
1271                 /* delete entries of new_dir */
1272                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1273                 if (!ep) {
1274                         ret = -EIO;
1275                         goto del_out;
1276                 }
1277
1278                 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1279                 if (num_entries < 0) {
1280                         ret = -EIO;
1281                         goto del_out;
1282                 }
1283                 brelse(new_bh);
1284
1285                 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1286                                 num_entries + 1)) {
1287                         ret = -EIO;
1288                         goto del_out;
1289                 }
1290
1291                 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1292                 if (new_entry_type == TYPE_DIR) {
1293                         /* new_ei, new_clu_to_free */
1294                         struct exfat_chain new_clu_to_free;
1295
1296                         exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1297                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1298                                 sbi), new_ei->flags);
1299
1300                         if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1301                                 /* just set I/O error only */
1302                                 ret = -EIO;
1303                         }
1304
1305                         i_size_write(new_inode, 0);
1306                         new_ei->start_clu = EXFAT_EOF_CLUSTER;
1307                         new_ei->flags = ALLOC_NO_FAT_CHAIN;
1308                 }
1309 del_out:
1310                 /* Update new_inode ei
1311                  * Prevent syncing removed new_inode
1312                  * (new_ei is already initialized above code ("if (new_inode)")
1313                  */
1314                 new_ei->dir.dir = DIR_DELETED;
1315         }
1316         exfat_clear_volume_dirty(sb);
1317 out:
1318         return ret;
1319 }
1320
1321 static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry,
1322                 struct inode *new_dir, struct dentry *new_dentry,
1323                 unsigned int flags)
1324 {
1325         struct inode *old_inode, *new_inode;
1326         struct super_block *sb = old_dir->i_sb;
1327         loff_t i_pos;
1328         int err;
1329
1330         /*
1331          * The VFS already checks for existence, so for local filesystems
1332          * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1333          * Don't support any other flags
1334          */
1335         if (flags & ~RENAME_NOREPLACE)
1336                 return -EINVAL;
1337
1338         mutex_lock(&EXFAT_SB(sb)->s_lock);
1339         old_inode = old_dentry->d_inode;
1340         new_inode = new_dentry->d_inode;
1341
1342         err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1343         if (err)
1344                 goto unlock;
1345
1346         inode_inc_iversion(new_dir);
1347         new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
1348                 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1349         exfat_truncate_atime(&new_dir->i_atime);
1350         if (IS_DIRSYNC(new_dir))
1351                 exfat_sync_inode(new_dir);
1352         else
1353                 mark_inode_dirty(new_dir);
1354
1355         i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1356                 (EXFAT_I(old_inode)->entry & 0xffffffff);
1357         exfat_unhash_inode(old_inode);
1358         exfat_hash_inode(old_inode, i_pos);
1359         if (IS_DIRSYNC(new_dir))
1360                 exfat_sync_inode(old_inode);
1361         else
1362                 mark_inode_dirty(old_inode);
1363
1364         if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1365                 drop_nlink(old_dir);
1366                 if (!new_inode)
1367                         inc_nlink(new_dir);
1368         }
1369
1370         inode_inc_iversion(old_dir);
1371         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1372         if (IS_DIRSYNC(old_dir))
1373                 exfat_sync_inode(old_dir);
1374         else
1375                 mark_inode_dirty(old_dir);
1376
1377         if (new_inode) {
1378                 exfat_unhash_inode(new_inode);
1379
1380                 /* skip drop_nlink if new_inode already has been dropped */
1381                 if (new_inode->i_nlink) {
1382                         drop_nlink(new_inode);
1383                         if (S_ISDIR(new_inode->i_mode))
1384                                 drop_nlink(new_inode);
1385                 } else {
1386                         exfat_warn(sb, "abnormal access to an inode dropped");
1387                         WARN_ON(new_inode->i_nlink == 0);
1388                 }
1389                 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
1390                         current_time(new_inode);
1391         }
1392
1393 unlock:
1394         mutex_unlock(&EXFAT_SB(sb)->s_lock);
1395         return err;
1396 }
1397
1398 const struct inode_operations exfat_dir_inode_operations = {
1399         .create         = exfat_create,
1400         .lookup         = exfat_lookup,
1401         .unlink         = exfat_unlink,
1402         .mkdir          = exfat_mkdir,
1403         .rmdir          = exfat_rmdir,
1404         .rename         = exfat_rename,
1405         .setattr        = exfat_setattr,
1406         .getattr        = exfat_getattr,
1407 };