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 /* search EMPTY CONTINUOUS "num_entries" entries */
 208 static int exfat_search_empty_slot(struct super_block *sb,
 209                 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
 210                 int num_entries, struct exfat_entry_set_cache *es)
 211 {
 212         int i, dentry, ret;
 213         int dentries_per_clu;
 214         struct exfat_chain clu;
 215         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 216         int total_entries = EXFAT_CLU_TO_DEN(p_dir->size, sbi);
 217
 218         dentries_per_clu = sbi->dentries_per_clu;
 219
 220         if (hint_femp->eidx != EXFAT_HINT_NONE) {
 221                 dentry = hint_femp->eidx;
 222
 223                 /*
 224                  * If hint_femp->count is enough, it is needed to check if
 225                  * there are actual empty entries.
 226                  * Otherwise, and if "dentry + hint_famp->count" is also equal
 227                  * to "p_dir->size * dentries_per_clu", it means ENOSPC.
 228                  */
 229                 if (dentry + hint_femp->count == total_entries &&
 230                     num_entries > hint_femp->count)
 231                         return -ENOSPC;
 232
 233                 hint_femp->eidx = EXFAT_HINT_NONE;
 234                 exfat_chain_dup(&clu, &hint_femp->cur);
 235         } else {
 236                 exfat_chain_dup(&clu, p_dir);
 237                 dentry = 0;
 238         }
 239
 240         while (dentry + num_entries < total_entries &&
 241                clu.dir != EXFAT_EOF_CLUSTER) {
 242                 i = dentry & (dentries_per_clu - 1);
 243
 244                 ret = exfat_get_empty_dentry_set(es, sb, &clu, i, num_entries);
 245                 if (ret < 0)
 246                         return ret;
 247                 else if (ret == 0)
 248                         return dentry;
 249
 250                 dentry += ret;
 251                 i += ret;
 252
 253                 while (i >= dentries_per_clu) {
 254                         if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 255                                 if (--clu.size > 0)
 256                                         clu.dir++;
 257                                 else
 258                                         clu.dir = EXFAT_EOF_CLUSTER;
 259                         } else {
 260                                 if (exfat_get_next_cluster(sb, &clu.dir))
 261                                         return -EIO;
 262                         }
 263
 264                         i -= dentries_per_clu;
 265                 }
 266         }
 267
 268         hint_femp->eidx = dentry;
 269         hint_femp->count = 0;
 270         if (dentry == total_entries || clu.dir == EXFAT_EOF_CLUSTER)
 271                 exfat_chain_set(&hint_femp->cur, EXFAT_EOF_CLUSTER, 0,
 272                                 clu.flags);
 273         else
 274                 hint_femp->cur = clu;
 275
 276         return -ENOSPC;
 277 }
 278
 279 static int exfat_check_max_dentries(struct inode *inode)
 280 {
 281         if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
 282                 /*
 283                  * exFAT spec allows a dir to grow up to 8388608(256MB)
 284                  * dentries
 285                  */
 286                 return -ENOSPC;
 287         }
 288         return 0;
 289 }
 290
 291 /* find empty directory entry.
 292  * if there isn't any empty slot, expand cluster chain.
 293  */
 294 static int exfat_find_empty_entry(struct inode *inode,
 295                 struct exfat_chain *p_dir, int num_entries,
 296                 struct exfat_entry_set_cache *es)
 297 {
 298         int dentry;
 299         unsigned int ret, last_clu;
 300         loff_t size = 0;
 301         struct exfat_chain clu;
 302         struct super_block *sb = inode->i_sb;
 303         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 304         struct exfat_inode_info *ei = EXFAT_I(inode);
 305         struct exfat_hint_femp hint_femp;
 306
 307         hint_femp.eidx = EXFAT_HINT_NONE;
 308
 309         if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
 310                 hint_femp = ei->hint_femp;
 311                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 312         }
 313
 314         while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
 315                                         num_entries, es)) < 0) {
 316                 if (dentry == -EIO)
 317                         break;
 318
 319                 if (exfat_check_max_dentries(inode))
 320                         return -ENOSPC;
 321
 322                 /*
 323                  * Allocate new cluster to this directory
 324                  */
 325                 if (ei->start_clu != EXFAT_EOF_CLUSTER) {
 326                         /* we trust p_dir->size regardless of FAT type */
 327                         if (exfat_find_last_cluster(sb, p_dir, &last_clu))
 328                                 return -EIO;
 329
 330                         exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
 331                 } else {
 332                         /* This directory is empty */
 333                         exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0,
 334                                         ALLOC_NO_FAT_CHAIN);
 335                 }
 336
 337                 /* allocate a cluster */
 338                 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
 339                 if (ret)
 340                         return ret;
 341
 342                 if (exfat_zeroed_cluster(inode, clu.dir))
 343                         return -EIO;
 344
 345                 if (ei->start_clu == EXFAT_EOF_CLUSTER) {
 346                         ei->start_clu = clu.dir;
 347                         p_dir->dir = clu.dir;
 348                 }
 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.cur.dir == EXFAT_EOF_CLUSTER)
 365                         exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
 366
 367                 hint_femp.count += sbi->dentries_per_clu;
 368
 369                 hint_femp.cur.size++;
 370                 p_dir->size++;
 371                 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
 372
 373                 /* directory inode should be updated in here */
 374                 i_size_write(inode, size);
 375                 ei->i_size_ondisk += sbi->cluster_size;
 376                 ei->i_size_aligned += sbi->cluster_size;
 377                 ei->valid_size += sbi->cluster_size;
 378                 ei->flags = p_dir->flags;
 379                 inode->i_blocks += sbi->cluster_size >> 9;
 380         }
 381
 382         return dentry;
 383 }
 384
 385 /*
 386  * Name Resolution Functions :
 387  * Zero if it was successful; otherwise nonzero.
 388  */
 389 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
 390                 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
 391                 int lookup)
 392 {
 393         int namelen;
 394         int lossy = NLS_NAME_NO_LOSSY;
 395         struct super_block *sb = inode->i_sb;
 396         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 397         struct exfat_inode_info *ei = EXFAT_I(inode);
 398         int pathlen = strlen(path);
 399
 400         /*
 401          * get the length of the pathname excluding
 402          * trailing periods, if any.
 403          */
 404         namelen = exfat_striptail_len(pathlen, path, false);
 405         if (EXFAT_SB(sb)->options.keep_last_dots) {
 406                 /*
 407                  * Do not allow the creation of files with names
 408                  * ending with period(s).
 409                  */
 410                 if (!lookup && (namelen < pathlen))
 411                         return -EINVAL;
 412                 namelen = pathlen;
 413         }
 414         if (!namelen)
 415                 return -ENOENT;
 416         if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
 417                 return -ENAMETOOLONG;
 418
 419         /*
 420          * strip all leading spaces :
 421          * "MS windows 7" supports leading spaces.
 422          * So we should skip this preprocessing for compatibility.
 423          */
 424
 425         /* file name conversion :
 426          * If lookup case, we allow bad-name for compatibility.
 427          */
 428         namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
 429                         &lossy);
 430         if (namelen < 0)
 431                 return namelen; /* return error value */
 432
 433         if ((lossy && !lookup) || !namelen)
 434                 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
 435
 436         exfat_chain_set(p_dir, ei->start_clu,
 437                 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
 438
 439         return 0;
 440 }
 441
 442 static inline int exfat_resolve_path(struct inode *inode,
 443                 const unsigned char *path, struct exfat_chain *dir,
 444                 struct exfat_uni_name *uni)
 445 {
 446         return __exfat_resolve_path(inode, path, dir, uni, 0);
 447 }
 448
 449 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
 450                 const unsigned char *path, struct exfat_chain *dir,
 451                 struct exfat_uni_name *uni)
 452 {
 453         return __exfat_resolve_path(inode, path, dir, uni, 1);
 454 }
 455
 456 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
 457 {
 458         return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
 459 }
 460
 461 static int exfat_add_entry(struct inode *inode, const char *path,
 462                 struct exfat_chain *p_dir, unsigned int type,
 463                 struct exfat_dir_entry *info)
 464 {
 465         int ret, dentry, num_entries;
 466         struct super_block *sb = inode->i_sb;
 467         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 468         struct exfat_uni_name uniname;
 469         struct exfat_chain clu;
 470         struct timespec64 ts = current_time(inode);
 471         struct exfat_entry_set_cache es;
 472         int clu_size = 0;
 473         unsigned int start_clu = EXFAT_FREE_CLUSTER;
 474
 475         ret = exfat_resolve_path(inode, path, p_dir, &uniname);
 476         if (ret)
 477                 goto out;
 478
 479         num_entries = exfat_calc_num_entries(&uniname);
 480         if (num_entries < 0) {
 481                 ret = num_entries;
 482                 goto out;
 483         }
 484
 485         /* exfat_find_empty_entry must be called before alloc_cluster() */
 486         dentry = exfat_find_empty_entry(inode, p_dir, num_entries, &es);
 487         if (dentry < 0) {
 488                 ret = dentry; /* -EIO or -ENOSPC */
 489                 goto out;
 490         }
 491
 492         if (type == TYPE_DIR && !sbi->options.zero_size_dir) {
 493                 ret = exfat_alloc_new_dir(inode, &clu);
 494                 if (ret) {
 495                         exfat_put_dentry_set(&es, false);
 496                         goto out;
 497                 }
 498                 start_clu = clu.dir;
 499                 clu_size = sbi->cluster_size;
 500         }
 501
 502         /* update the directory entry */
 503         /* fill the dos name directory entry information of the created file.
 504          * the first cluster is not determined yet. (0)
 505          */
 506         exfat_init_dir_entry(&es, type, start_clu, clu_size, &ts);
 507         exfat_init_ext_entry(&es, num_entries, &uniname);
 508
 509         ret = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
 510         if (ret)
 511                 goto out;
 512
 513         info->dir = *p_dir;
 514         info->entry = dentry;
 515         info->flags = ALLOC_NO_FAT_CHAIN;
 516         info->type = type;
 517
 518         if (type == TYPE_FILE) {
 519                 info->attr = EXFAT_ATTR_ARCHIVE;
 520                 info->start_clu = EXFAT_EOF_CLUSTER;
 521                 info->size = 0;
 522                 info->num_subdirs = 0;
 523         } else {
 524                 info->attr = EXFAT_ATTR_SUBDIR;
 525                 if (sbi->options.zero_size_dir)
 526                         info->start_clu = EXFAT_EOF_CLUSTER;
 527                 else
 528                         info->start_clu = start_clu;
 529                 info->size = clu_size;
 530                 info->num_subdirs = EXFAT_MIN_SUBDIR;
 531         }
 532         info->valid_size = info->size;
 533
 534         memset(&info->crtime, 0, sizeof(info->crtime));
 535         memset(&info->mtime, 0, sizeof(info->mtime));
 536         memset(&info->atime, 0, sizeof(info->atime));
 537 out:
 538         return ret;
 539 }
 540
 541 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir,
 542                         struct dentry *dentry, umode_t mode, bool excl)
 543 {
 544         struct super_block *sb = dir->i_sb;
 545         struct inode *inode;
 546         struct exfat_chain cdir;
 547         struct exfat_dir_entry info;
 548         loff_t i_pos;
 549         int err;
 550         loff_t size = i_size_read(dir);
 551
 552         mutex_lock(&EXFAT_SB(sb)->s_lock);
 553         exfat_set_volume_dirty(sb);
 554         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
 555                 &info);
 556         if (err)
 557                 goto unlock;
 558
 559         inode_inc_iversion(dir);
 560         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 561         if (IS_DIRSYNC(dir) && size != i_size_read(dir))
 562                 exfat_sync_inode(dir);
 563         else
 564                 mark_inode_dirty(dir);
 565
 566         i_pos = exfat_make_i_pos(&info);
 567         inode = exfat_build_inode(sb, &info, i_pos);
 568         err = PTR_ERR_OR_ZERO(inode);
 569         if (err)
 570                 goto unlock;
 571
 572         inode_inc_iversion(inode);
 573         EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
 574         exfat_truncate_inode_atime(inode);
 575
 576         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 577
 578         d_instantiate(dentry, inode);
 579 unlock:
 580         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 581         return err;
 582 }
 583
 584 /* lookup a file */
 585 static int exfat_find(struct inode *dir, struct qstr *qname,
 586                 struct exfat_dir_entry *info)
 587 {
 588         int ret, dentry, count;
 589         struct exfat_chain cdir;
 590         struct exfat_uni_name uni_name;
 591         struct super_block *sb = dir->i_sb;
 592         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 593         struct exfat_inode_info *ei = EXFAT_I(dir);
 594         struct exfat_dentry *ep, *ep2;
 595         struct exfat_entry_set_cache es;
 596         /* for optimized dir & entry to prevent long traverse of cluster chain */
 597         struct exfat_hint hint_opt;
 598
 599         if (qname->len == 0)
 600                 return -ENOENT;
 601
 602         /* check the validity of directory name in the given pathname */
 603         ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
 604         if (ret)
 605                 return ret;
 606
 607         /* check the validation of hint_stat and initialize it if required */
 608         if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
 609                 ei->hint_stat.clu = cdir.dir;
 610                 ei->hint_stat.eidx = 0;
 611                 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
 612                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 613         }
 614
 615         /* search the file name for directories */
 616         dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt);
 617         if (dentry < 0)
 618                 return dentry; /* -error value */
 619
 620         info->dir = cdir;
 621         info->entry = dentry;
 622         info->num_subdirs = 0;
 623
 624         /* adjust cdir to the optimized value */
 625         cdir.dir = hint_opt.clu;
 626         if (cdir.flags & ALLOC_NO_FAT_CHAIN)
 627                 cdir.size -= dentry / sbi->dentries_per_clu;
 628         dentry = hint_opt.eidx;
 629         if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES))
 630                 return -EIO;
 631         ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
 632         ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
 633
 634         info->type = exfat_get_entry_type(ep);
 635         info->attr = le16_to_cpu(ep->dentry.file.attr);
 636         info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
 637         info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size);
 638         info->size = le64_to_cpu(ep2->dentry.stream.size);
 639         if (info->size == 0) {
 640                 info->flags = ALLOC_NO_FAT_CHAIN;
 641                 info->start_clu = EXFAT_EOF_CLUSTER;
 642         } else {
 643                 info->flags = ep2->dentry.stream.flags;
 644                 info->start_clu =
 645                         le32_to_cpu(ep2->dentry.stream.start_clu);
 646         }
 647
 648         exfat_get_entry_time(sbi, &info->crtime,
 649                              ep->dentry.file.create_tz,
 650                              ep->dentry.file.create_time,
 651                              ep->dentry.file.create_date,
 652                              ep->dentry.file.create_time_cs);
 653         exfat_get_entry_time(sbi, &info->mtime,
 654                              ep->dentry.file.modify_tz,
 655                              ep->dentry.file.modify_time,
 656                              ep->dentry.file.modify_date,
 657                              ep->dentry.file.modify_time_cs);
 658         exfat_get_entry_time(sbi, &info->atime,
 659                              ep->dentry.file.access_tz,
 660                              ep->dentry.file.access_time,
 661                              ep->dentry.file.access_date,
 662                              0);
 663         exfat_put_dentry_set(&es, false);
 664
 665         if (ei->start_clu == EXFAT_FREE_CLUSTER) {
 666                 exfat_fs_error(sb,
 667                                "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
 668                                i_size_read(dir), ei->dir.dir, ei->entry);
 669                 return -EIO;
 670         }
 671
 672         if (info->type == TYPE_DIR) {
 673                 exfat_chain_set(&cdir, info->start_clu,
 674                                 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
 675                 count = exfat_count_dir_entries(sb, &cdir);
 676                 if (count < 0)
 677                         return -EIO;
 678
 679                 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
 680         }
 681         return 0;
 682 }
 683
 684 static int exfat_d_anon_disconn(struct dentry *dentry)
 685 {
 686         return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
 687 }
 688
 689 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
 690                 unsigned int flags)
 691 {
 692         struct super_block *sb = dir->i_sb;
 693         struct inode *inode;
 694         struct dentry *alias;
 695         struct exfat_dir_entry info;
 696         int err;
 697         loff_t i_pos;
 698         mode_t i_mode;
 699
 700         mutex_lock(&EXFAT_SB(sb)->s_lock);
 701         err = exfat_find(dir, &dentry->d_name, &info);
 702         if (err) {
 703                 if (err == -ENOENT) {
 704                         inode = NULL;
 705                         goto out;
 706                 }
 707                 goto unlock;
 708         }
 709
 710         i_pos = exfat_make_i_pos(&info);
 711         inode = exfat_build_inode(sb, &info, i_pos);
 712         err = PTR_ERR_OR_ZERO(inode);
 713         if (err)
 714                 goto unlock;
 715
 716         i_mode = inode->i_mode;
 717         alias = d_find_alias(inode);
 718
 719         /*
 720          * Checking "alias->d_parent == dentry->d_parent" to make sure
 721          * FS is not corrupted (especially double linked dir).
 722          */
 723         if (alias && alias->d_parent == dentry->d_parent &&
 724                         !exfat_d_anon_disconn(alias)) {
 725
 726                 /*
 727                  * Unhashed alias is able to exist because of revalidate()
 728                  * called by lookup_fast. You can easily make this status
 729                  * by calling create and lookup concurrently
 730                  * In such case, we reuse an alias instead of new dentry
 731                  */
 732                 if (d_unhashed(alias)) {
 733                         WARN_ON(alias->d_name.hash_len !=
 734                                 dentry->d_name.hash_len);
 735                         exfat_info(sb, "rehashed a dentry(%p) in read lookup",
 736                                    alias);
 737                         d_drop(dentry);
 738                         d_rehash(alias);
 739                 } else if (!S_ISDIR(i_mode)) {
 740                         /*
 741                          * This inode has non anonymous-DCACHE_DISCONNECTED
 742                          * dentry. This means, the user did ->lookup() by an
 743                          * another name (longname vs 8.3 alias of it) in past.
 744                          *
 745                          * Switch to new one for reason of locality if possible.
 746                          */
 747                         d_move(alias, dentry);
 748                 }
 749                 iput(inode);
 750                 mutex_unlock(&EXFAT_SB(sb)->s_lock);
 751                 return alias;
 752         }
 753         dput(alias);
 754 out:
 755         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 756         if (!inode)
 757                 exfat_d_version_set(dentry, inode_query_iversion(dir));
 758
 759         return d_splice_alias(inode, dentry);
 760 unlock:
 761         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 762         return ERR_PTR(err);
 763 }
 764
 765 /* remove an entry, BUT don't truncate */
 766 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
 767 {
 768         struct exfat_chain cdir;
 769         struct super_block *sb = dir->i_sb;
 770         struct inode *inode = dentry->d_inode;
 771         struct exfat_inode_info *ei = EXFAT_I(inode);
 772         struct exfat_entry_set_cache es;
 773         int entry, err = 0;
 774
 775         mutex_lock(&EXFAT_SB(sb)->s_lock);
 776         exfat_chain_dup(&cdir, &ei->dir);
 777         entry = ei->entry;
 778         if (ei->dir.dir == DIR_DELETED) {
 779                 exfat_err(sb, "abnormal access to deleted dentry");
 780                 err = -ENOENT;
 781                 goto unlock;
 782         }
 783
 784         err = exfat_get_dentry_set(&es, sb, &cdir, entry, ES_ALL_ENTRIES);
 785         if (err) {
 786                 err = -EIO;
 787                 goto unlock;
 788         }
 789
 790         exfat_set_volume_dirty(sb);
 791
 792         /* update the directory entry */
 793         exfat_remove_entries(inode, &es, ES_IDX_FILE);
 794
 795         err = exfat_put_dentry_set(&es, IS_DIRSYNC(inode));
 796         if (err)
 797                 goto unlock;
 798
 799         /* This doesn't modify ei */
 800         ei->dir.dir = DIR_DELETED;
 801
 802         inode_inc_iversion(dir);
 803         simple_inode_init_ts(dir);
 804         exfat_truncate_inode_atime(dir);
 805         mark_inode_dirty(dir);
 806
 807         clear_nlink(inode);
 808         simple_inode_init_ts(inode);
 809         exfat_truncate_inode_atime(inode);
 810         exfat_unhash_inode(inode);
 811         exfat_d_version_set(dentry, inode_query_iversion(dir));
 812 unlock:
 813         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 814         return err;
 815 }
 816
 817 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 818                        struct dentry *dentry, umode_t mode)
 819 {
 820         struct super_block *sb = dir->i_sb;
 821         struct inode *inode;
 822         struct exfat_dir_entry info;
 823         struct exfat_chain cdir;
 824         loff_t i_pos;
 825         int err;
 826         loff_t size = i_size_read(dir);
 827
 828         mutex_lock(&EXFAT_SB(sb)->s_lock);
 829         exfat_set_volume_dirty(sb);
 830         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
 831                 &info);
 832         if (err)
 833                 goto unlock;
 834
 835         inode_inc_iversion(dir);
 836         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 837         if (IS_DIRSYNC(dir) && size != i_size_read(dir))
 838                 exfat_sync_inode(dir);
 839         else
 840                 mark_inode_dirty(dir);
 841         inc_nlink(dir);
 842
 843         i_pos = exfat_make_i_pos(&info);
 844         inode = exfat_build_inode(sb, &info, i_pos);
 845         err = PTR_ERR_OR_ZERO(inode);
 846         if (err)
 847                 goto unlock;
 848
 849         inode_inc_iversion(inode);
 850         EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
 851         exfat_truncate_inode_atime(inode);
 852         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 853
 854         d_instantiate(dentry, inode);
 855
 856 unlock:
 857         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 858         return err;
 859 }
 860
 861 static int exfat_check_dir_empty(struct super_block *sb,
 862                 struct exfat_chain *p_dir)
 863 {
 864         int i, dentries_per_clu;
 865         unsigned int type;
 866         struct exfat_chain clu;
 867         struct exfat_dentry *ep;
 868         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 869         struct buffer_head *bh;
 870
 871         dentries_per_clu = sbi->dentries_per_clu;
 872
 873         if (p_dir->dir == EXFAT_EOF_CLUSTER)
 874                 return 0;
 875
 876         exfat_chain_dup(&clu, p_dir);
 877
 878         while (clu.dir != EXFAT_EOF_CLUSTER) {
 879                 for (i = 0; i < dentries_per_clu; i++) {
 880                         ep = exfat_get_dentry(sb, &clu, i, &bh);
 881                         if (!ep)
 882                                 return -EIO;
 883                         type = exfat_get_entry_type(ep);
 884                         brelse(bh);
 885                         if (type == TYPE_UNUSED)
 886                                 return 0;
 887
 888                         if (type != TYPE_FILE && type != TYPE_DIR)
 889                                 continue;
 890
 891                         return -ENOTEMPTY;
 892                 }
 893
 894                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 895                         if (--clu.size > 0)
 896                                 clu.dir++;
 897                         else
 898                                 clu.dir = EXFAT_EOF_CLUSTER;
 899                 } else {
 900                         if (exfat_get_next_cluster(sb, &(clu.dir)))
 901                                 return -EIO;
 902                 }
 903         }
 904
 905         return 0;
 906 }
 907
 908 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
 909 {
 910         struct inode *inode = dentry->d_inode;
 911         struct exfat_chain cdir, clu_to_free;
 912         struct super_block *sb = inode->i_sb;
 913         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 914         struct exfat_inode_info *ei = EXFAT_I(inode);
 915         struct exfat_entry_set_cache es;
 916         int entry, err;
 917
 918         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 919
 920         exfat_chain_dup(&cdir, &ei->dir);
 921         entry = ei->entry;
 922
 923         if (ei->dir.dir == DIR_DELETED) {
 924                 exfat_err(sb, "abnormal access to deleted dentry");
 925                 err = -ENOENT;
 926                 goto unlock;
 927         }
 928
 929         exfat_chain_set(&clu_to_free, ei->start_clu,
 930                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
 931
 932         err = exfat_check_dir_empty(sb, &clu_to_free);
 933         if (err) {
 934                 if (err == -EIO)
 935                         exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
 936                                   err);
 937                 goto unlock;
 938         }
 939
 940         err = exfat_get_dentry_set(&es, sb, &cdir, entry, ES_ALL_ENTRIES);
 941         if (err) {
 942                 err = -EIO;
 943                 goto unlock;
 944         }
 945
 946         exfat_set_volume_dirty(sb);
 947
 948         exfat_remove_entries(inode, &es, ES_IDX_FILE);
 949
 950         err = exfat_put_dentry_set(&es, IS_DIRSYNC(dir));
 951         if (err)
 952                 goto unlock;
 953
 954         ei->dir.dir = DIR_DELETED;
 955
 956         inode_inc_iversion(dir);
 957         simple_inode_init_ts(dir);
 958         exfat_truncate_inode_atime(dir);
 959         if (IS_DIRSYNC(dir))
 960                 exfat_sync_inode(dir);
 961         else
 962                 mark_inode_dirty(dir);
 963         drop_nlink(dir);
 964
 965         clear_nlink(inode);
 966         simple_inode_init_ts(inode);
 967         exfat_truncate_inode_atime(inode);
 968         exfat_unhash_inode(inode);
 969         exfat_d_version_set(dentry, inode_query_iversion(dir));
 970 unlock:
 971         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 972         return err;
 973 }
 974
 975 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 976                 int oldentry, struct exfat_uni_name *p_uniname,
 977                 struct exfat_inode_info *ei)
 978 {
 979         int ret, num_new_entries;
 980         struct exfat_dentry *epold, *epnew;
 981         struct super_block *sb = inode->i_sb;
 982         struct exfat_entry_set_cache old_es, new_es;
 983         int sync = IS_DIRSYNC(inode);
 984
 985         num_new_entries = exfat_calc_num_entries(p_uniname);
 986         if (num_new_entries < 0)
 987                 return num_new_entries;
 988
 989         ret = exfat_get_dentry_set(&old_es, sb, p_dir, oldentry, ES_ALL_ENTRIES);
 990         if (ret) {
 991                 ret = -EIO;
 992                 return ret;
 993         }
 994
 995         epold = exfat_get_dentry_cached(&old_es, ES_IDX_FILE);
 996
 997         if (old_es.num_entries < num_new_entries) {
 998                 int newentry;
 999
1000                 newentry = exfat_find_empty_entry(inode, p_dir, num_new_entries,
1001                                 &new_es);
1002                 if (newentry < 0) {
1003                         ret = newentry; /* -EIO or -ENOSPC */
1004                         goto put_old_es;
1005                 }
1006
1007                 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE);
1008                 *epnew = *epold;
1009                 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1010                         epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1011                         ei->attr |= EXFAT_ATTR_ARCHIVE;
1012                 }
1013
1014                 epold = exfat_get_dentry_cached(&old_es, ES_IDX_STREAM);
1015                 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM);
1016                 *epnew = *epold;
1017
1018                 exfat_init_ext_entry(&new_es, num_new_entries, p_uniname);
1019
1020                 ret = exfat_put_dentry_set(&new_es, sync);
1021                 if (ret)
1022                         goto put_old_es;
1023
1024                 exfat_remove_entries(inode, &old_es, ES_IDX_FILE);
1025                 ei->dir = *p_dir;
1026                 ei->entry = newentry;
1027         } else {
1028                 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1029                         epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1030                         ei->attr |= EXFAT_ATTR_ARCHIVE;
1031                 }
1032
1033                 exfat_remove_entries(inode, &old_es, ES_IDX_FIRST_FILENAME + 1);
1034                 exfat_init_ext_entry(&old_es, num_new_entries, p_uniname);
1035         }
1036         return exfat_put_dentry_set(&old_es, sync);
1037
1038 put_old_es:
1039         exfat_put_dentry_set(&old_es, false);
1040         return ret;
1041 }
1042
1043 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1044                 int oldentry, struct exfat_chain *p_newdir,
1045                 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1046 {
1047         int ret, newentry, num_new_entries;
1048         struct exfat_dentry *epmov, *epnew;
1049         struct super_block *sb = inode->i_sb;
1050         struct exfat_entry_set_cache mov_es, new_es;
1051
1052         num_new_entries = exfat_calc_num_entries(p_uniname);
1053         if (num_new_entries < 0)
1054                 return num_new_entries;
1055
1056         ret = exfat_get_dentry_set(&mov_es, sb, p_olddir, oldentry,
1057                         ES_ALL_ENTRIES);
1058         if (ret)
1059                 return -EIO;
1060
1061         newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries,
1062                         &new_es);
1063         if (newentry < 0) {
1064                 ret = newentry; /* -EIO or -ENOSPC */
1065                 goto put_mov_es;
1066         }
1067
1068         epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_FILE);
1069         epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE);
1070         *epnew = *epmov;
1071         if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1072                 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1073                 ei->attr |= EXFAT_ATTR_ARCHIVE;
1074         }
1075
1076         epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_STREAM);
1077         epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM);
1078         *epnew = *epmov;
1079
1080         exfat_init_ext_entry(&new_es, num_new_entries, p_uniname);
1081         exfat_remove_entries(inode, &mov_es, ES_IDX_FILE);
1082
1083         exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1084                 p_newdir->flags);
1085
1086         ei->entry = newentry;
1087
1088         ret = exfat_put_dentry_set(&new_es, IS_DIRSYNC(inode));
1089         if (ret)
1090                 goto put_mov_es;
1091
1092         return exfat_put_dentry_set(&mov_es, IS_DIRSYNC(inode));
1093
1094 put_mov_es:
1095         exfat_put_dentry_set(&mov_es, false);
1096
1097         return ret;
1098 }
1099
1100 /* rename or move a old file into a new file */
1101 static int __exfat_rename(struct inode *old_parent_inode,
1102                 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1103                 struct dentry *new_dentry)
1104 {
1105         int ret;
1106         int dentry;
1107         struct exfat_chain olddir, newdir;
1108         struct exfat_chain *p_dir = NULL;
1109         struct exfat_uni_name uni_name;
1110         struct exfat_dentry *ep;
1111         struct super_block *sb = old_parent_inode->i_sb;
1112         struct exfat_sb_info *sbi = EXFAT_SB(sb);
1113         const unsigned char *new_path = new_dentry->d_name.name;
1114         struct inode *new_inode = new_dentry->d_inode;
1115         struct exfat_inode_info *new_ei = NULL;
1116         unsigned int new_entry_type = TYPE_UNUSED;
1117         int new_entry = 0;
1118         struct buffer_head *new_bh = NULL;
1119
1120         /* check the validity of pointer parameters */
1121         if (new_path == NULL || strlen(new_path) == 0)
1122                 return -EINVAL;
1123
1124         if (ei->dir.dir == DIR_DELETED) {
1125                 exfat_err(sb, "abnormal access to deleted source dentry");
1126                 return -ENOENT;
1127         }
1128
1129         exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu,
1130                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi),
1131                 EXFAT_I(old_parent_inode)->flags);
1132         dentry = ei->entry;
1133
1134         /* check whether new dir is existing directory and empty */
1135         if (new_inode) {
1136                 ret = -EIO;
1137                 new_ei = EXFAT_I(new_inode);
1138
1139                 if (new_ei->dir.dir == DIR_DELETED) {
1140                         exfat_err(sb, "abnormal access to deleted target dentry");
1141                         goto out;
1142                 }
1143
1144                 p_dir = &(new_ei->dir);
1145                 new_entry = new_ei->entry;
1146                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1147                 if (!ep)
1148                         goto out;
1149
1150                 new_entry_type = exfat_get_entry_type(ep);
1151                 brelse(new_bh);
1152
1153                 /* if new_inode exists, update ei */
1154                 if (new_entry_type == TYPE_DIR) {
1155                         struct exfat_chain new_clu;
1156
1157                         new_clu.dir = new_ei->start_clu;
1158                         new_clu.size =
1159                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1160                                 sbi);
1161                         new_clu.flags = new_ei->flags;
1162
1163                         ret = exfat_check_dir_empty(sb, &new_clu);
1164                         if (ret)
1165                                 goto out;
1166                 }
1167         }
1168
1169         /* check the validity of directory name in the given new pathname */
1170         ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1171                         &uni_name);
1172         if (ret)
1173                 goto out;
1174
1175         exfat_set_volume_dirty(sb);
1176
1177         if (olddir.dir == newdir.dir)
1178                 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1179                                 &uni_name, ei);
1180         else
1181                 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1182                                 &newdir, &uni_name, ei);
1183
1184         if (!ret && new_inode) {
1185                 struct exfat_entry_set_cache es;
1186
1187                 /* delete entries of new_dir */
1188                 ret = exfat_get_dentry_set(&es, sb, p_dir, new_entry,
1189                                 ES_ALL_ENTRIES);
1190                 if (ret) {
1191                         ret = -EIO;
1192                         goto del_out;
1193                 }
1194
1195                 exfat_remove_entries(new_inode, &es, ES_IDX_FILE);
1196
1197                 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(new_inode));
1198                 if (ret)
1199                         goto del_out;
1200
1201                 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1202                 if (new_entry_type == TYPE_DIR &&
1203                     new_ei->start_clu != EXFAT_EOF_CLUSTER) {
1204                         /* new_ei, new_clu_to_free */
1205                         struct exfat_chain new_clu_to_free;
1206
1207                         exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1208                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1209                                 sbi), new_ei->flags);
1210
1211                         if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1212                                 /* just set I/O error only */
1213                                 ret = -EIO;
1214                         }
1215
1216                         i_size_write(new_inode, 0);
1217                         new_ei->valid_size = 0;
1218                         new_ei->start_clu = EXFAT_EOF_CLUSTER;
1219                         new_ei->flags = ALLOC_NO_FAT_CHAIN;
1220                 }
1221 del_out:
1222                 /* Update new_inode ei
1223                  * Prevent syncing removed new_inode
1224                  * (new_ei is already initialized above code ("if (new_inode)")
1225                  */
1226                 new_ei->dir.dir = DIR_DELETED;
1227         }
1228 out:
1229         return ret;
1230 }
1231
1232 static int exfat_rename(struct mnt_idmap *idmap,
1233                         struct inode *old_dir, struct dentry *old_dentry,
1234                         struct inode *new_dir, struct dentry *new_dentry,
1235                         unsigned int flags)
1236 {
1237         struct inode *old_inode, *new_inode;
1238         struct super_block *sb = old_dir->i_sb;
1239         loff_t i_pos;
1240         int err;
1241         loff_t size = i_size_read(new_dir);
1242
1243         /*
1244          * The VFS already checks for existence, so for local filesystems
1245          * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1246          * Don't support any other flags
1247          */
1248         if (flags & ~RENAME_NOREPLACE)
1249                 return -EINVAL;
1250
1251         mutex_lock(&EXFAT_SB(sb)->s_lock);
1252         old_inode = old_dentry->d_inode;
1253         new_inode = new_dentry->d_inode;
1254
1255         err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1256         if (err)
1257                 goto unlock;
1258
1259         inode_inc_iversion(new_dir);
1260         simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1261         EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1262         exfat_truncate_inode_atime(new_dir);
1263         if (IS_DIRSYNC(new_dir) && size != i_size_read(new_dir))
1264                 exfat_sync_inode(new_dir);
1265         else
1266                 mark_inode_dirty(new_dir);
1267
1268         i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1269                 (EXFAT_I(old_inode)->entry & 0xffffffff);
1270         exfat_unhash_inode(old_inode);
1271         exfat_hash_inode(old_inode, i_pos);
1272         if (IS_DIRSYNC(new_dir))
1273                 exfat_sync_inode(old_inode);
1274         else
1275                 mark_inode_dirty(old_inode);
1276
1277         if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1278                 drop_nlink(old_dir);
1279                 if (!new_inode)
1280                         inc_nlink(new_dir);
1281         }
1282
1283         inode_inc_iversion(old_dir);
1284         if (new_dir != old_dir)
1285                 mark_inode_dirty(old_dir);
1286
1287         if (new_inode) {
1288                 exfat_unhash_inode(new_inode);
1289
1290                 /* skip drop_nlink if new_inode already has been dropped */
1291                 if (new_inode->i_nlink) {
1292                         drop_nlink(new_inode);
1293                         if (S_ISDIR(new_inode->i_mode))
1294                                 drop_nlink(new_inode);
1295                 } else {
1296                         exfat_warn(sb, "abnormal access to an inode dropped");
1297                         WARN_ON(new_inode->i_nlink == 0);
1298                 }
1299                 EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
1300         }
1301
1302 unlock:
1303         mutex_unlock(&EXFAT_SB(sb)->s_lock);
1304         return err;
1305 }
1306
1307 const struct inode_operations exfat_dir_inode_operations = {
1308         .create         = exfat_create,
1309         .lookup         = exfat_lookup,
1310         .unlink         = exfat_unlink,
1311         .mkdir          = exfat_mkdir,
1312         .rmdir          = exfat_rmdir,
1313         .rename         = exfat_rename,
1314         .setattr        = exfat_setattr,
1315         .getattr        = exfat_getattr,
1316 };