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