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