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