fs/exfat/namei.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
   4  */
   5
   6 #include <linux/iversion.h>
   7 #include <linux/namei.h>
   8 #include <linux/slab.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/nls.h>
  11
  12 #include "exfat_raw.h"
  13 #include "exfat_fs.h"
  14
  15 static inline unsigned long exfat_d_version(struct dentry *dentry)
  16 {
  17         return (unsigned long) dentry->d_fsdata;
  18 }
  19
  20 static inline void exfat_d_version_set(struct dentry *dentry,
  21                 unsigned long version)
  22 {
  23         dentry->d_fsdata = (void *) version;
  24 }
  25
  26 /*
  27  * If new entry was created in the parent, it could create the 8.3 alias (the
  28  * shortname of logname).  So, the parent may have the negative-dentry which
  29  * matches the created 8.3 alias.
  30  *
  31  * If it happened, the negative dentry isn't actually negative anymore.  So,
  32  * drop it.
  33  */
  34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
  35 {
  36         int ret;
  37
  38         if (flags & LOOKUP_RCU)
  39                 return -ECHILD;
  40
  41         /*
  42          * This is not negative dentry. Always valid.
  43          *
  44          * Note, rename() to existing directory entry will have ->d_inode, and
  45          * will use existing name which isn't specified name by user.
  46          *
  47          * We may be able to drop this positive dentry here. But dropping
  48          * positive dentry isn't good idea. So it's unsupported like
  49          * rename("filename", "FILENAME") for now.
  50          */
  51         if (d_really_is_positive(dentry))
  52                 return 1;
  53
  54         /*
  55          * Drop the negative dentry, in order to make sure to use the case
  56          * sensitive name which is specified by user if this is for creation.
  57          */
  58         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
  59                 return 0;
  60
  61         spin_lock(&dentry->d_lock);
  62         ret = inode_eq_iversion(d_inode(dentry->d_parent),
  63                         exfat_d_version(dentry));
  64         spin_unlock(&dentry->d_lock);
  65         return ret;
  66 }
  67
  68 /* returns the length of a struct qstr, ignoring trailing dots */
  69 static unsigned int exfat_striptail_len(unsigned int len, const char *name)
  70 {
  71         while (len && name[len - 1] == '.')
  72                 len--;
  73         return len;
  74 }
  75
  76 /*
  77  * Compute the hash for the exfat name corresponding to the dentry.  If the name
  78  * is invalid, we leave the hash code unchanged so that the existing dentry can
  79  * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
  80  */
  81 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
  82 {
  83         struct super_block *sb = dentry->d_sb;
  84         struct nls_table *t = EXFAT_SB(sb)->nls_io;
  85         const unsigned char *name = qstr->name;
  86         unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
  87         unsigned long hash = init_name_hash(dentry);
  88         int i, charlen;
  89         wchar_t c;
  90
  91         for (i = 0; i < len; i += charlen) {
  92                 charlen = t->char2uni(&name[i], len - i, &c);
  93                 if (charlen < 0)
  94                         return charlen;
  95                 hash = partial_name_hash(exfat_toupper(sb, c), hash);
  96         }
  97
  98         qstr->hash = end_name_hash(hash);
  99         return 0;
 100 }
 101
 102 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
 103                 const char *str, const struct qstr *name)
 104 {
 105         struct super_block *sb = dentry->d_sb;
 106         struct nls_table *t = EXFAT_SB(sb)->nls_io;
 107         unsigned int alen = exfat_striptail_len(name->len, name->name);
 108         unsigned int blen = exfat_striptail_len(len, str);
 109         wchar_t c1, c2;
 110         int charlen, i;
 111
 112         if (alen != blen)
 113                 return 1;
 114
 115         for (i = 0; i < len; i += charlen) {
 116                 charlen = t->char2uni(&name->name[i], alen - i, &c1);
 117                 if (charlen < 0)
 118                         return 1;
 119                 if (charlen != t->char2uni(&str[i], blen - i, &c2))
 120                         return 1;
 121
 122                 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
 123                         return 1;
 124         }
 125
 126         return 0;
 127 }
 128
 129 const struct dentry_operations exfat_dentry_ops = {
 130         .d_revalidate   = exfat_d_revalidate,
 131         .d_hash         = exfat_d_hash,
 132         .d_compare      = exfat_d_cmp,
 133 };
 134
 135 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
 136 {
 137         struct super_block *sb = dentry->d_sb;
 138         const unsigned char *name = qstr->name;
 139         unsigned int len = exfat_striptail_len(qstr->len, qstr->name);
 140         unsigned long hash = init_name_hash(dentry);
 141         int i, charlen;
 142         unicode_t u;
 143
 144         for (i = 0; i < len; i += charlen) {
 145                 charlen = utf8_to_utf32(&name[i], len - i, &u);
 146                 if (charlen < 0)
 147                         return charlen;
 148
 149                 /*
 150                  * exfat_toupper() works only for code points up to the U+FFFF.
 151                  */
 152                 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
 153                                          hash);
 154         }
 155
 156         qstr->hash = end_name_hash(hash);
 157         return 0;
 158 }
 159
 160 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
 161                 const char *str, const struct qstr *name)
 162 {
 163         struct super_block *sb = dentry->d_sb;
 164         unsigned int alen = exfat_striptail_len(name->len, name->name);
 165         unsigned int blen = exfat_striptail_len(len, str);
 166         unicode_t u_a, u_b;
 167         int charlen, i;
 168
 169         if (alen != blen)
 170                 return 1;
 171
 172         for (i = 0; i < alen; i += charlen) {
 173                 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
 174                 if (charlen < 0)
 175                         return 1;
 176                 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
 177                         return 1;
 178
 179                 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
 180                         if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
 181                                 return 1;
 182                 } else {
 183                         if (u_a != u_b)
 184                                 return 1;
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 const struct dentry_operations exfat_utf8_dentry_ops = {
 192         .d_revalidate   = exfat_d_revalidate,
 193         .d_hash         = exfat_utf8_d_hash,
 194         .d_compare      = exfat_utf8_d_cmp,
 195 };
 196
 197 /* used only in search empty_slot() */
 198 #define CNT_UNUSED_NOHIT        (-1)
 199 #define CNT_UNUSED_HIT          (-2)
 200 /* search EMPTY CONTINUOUS "num_entries" entries */
 201 static int exfat_search_empty_slot(struct super_block *sb,
 202                 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
 203                 int num_entries)
 204 {
 205         int i, dentry, num_empty = 0;
 206         int dentries_per_clu;
 207         unsigned int type;
 208         struct exfat_chain clu;
 209         struct exfat_dentry *ep;
 210         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 211         struct buffer_head *bh;
 212
 213         dentries_per_clu = sbi->dentries_per_clu;
 214
 215         if (hint_femp->eidx != EXFAT_HINT_NONE) {
 216                 dentry = hint_femp->eidx;
 217                 if (num_entries <= hint_femp->count) {
 218                         hint_femp->eidx = EXFAT_HINT_NONE;
 219                         return dentry;
 220                 }
 221
 222                 exfat_chain_dup(&clu, &hint_femp->cur);
 223         } else {
 224                 exfat_chain_dup(&clu, p_dir);
 225                 dentry = 0;
 226         }
 227
 228         while (clu.dir != EXFAT_EOF_CLUSTER) {
 229                 i = dentry & (dentries_per_clu - 1);
 230
 231                 for (; i < dentries_per_clu; i++, dentry++) {
 232                         ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
 233                         if (!ep)
 234                                 return -EIO;
 235                         type = exfat_get_entry_type(ep);
 236                         brelse(bh);
 237
 238                         if (type == TYPE_UNUSED || type == TYPE_DELETED) {
 239                                 num_empty++;
 240                                 if (hint_femp->eidx == EXFAT_HINT_NONE) {
 241                                         hint_femp->eidx = dentry;
 242                                         hint_femp->count = CNT_UNUSED_NOHIT;
 243                                         exfat_chain_set(&hint_femp->cur,
 244                                                 clu.dir, clu.size, clu.flags);
 245                                 }
 246
 247                                 if (type == TYPE_UNUSED &&
 248                                     hint_femp->count != CNT_UNUSED_HIT)
 249                                         hint_femp->count = CNT_UNUSED_HIT;
 250                         } else {
 251                                 if (hint_femp->eidx != EXFAT_HINT_NONE &&
 252                                     hint_femp->count == CNT_UNUSED_HIT) {
 253                                         /* unused empty group means
 254                                          * an empty group which includes
 255                                          * unused dentry
 256                                          */
 257                                         exfat_fs_error(sb,
 258                                                 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
 259                                                 dentry, hint_femp->eidx,
 260                                                 p_dir->dir, clu.dir);
 261                                         return -EIO;
 262                                 }
 263
 264                                 num_empty = 0;
 265                                 hint_femp->eidx = EXFAT_HINT_NONE;
 266                         }
 267
 268                         if (num_empty >= num_entries) {
 269                                 /* found and invalidate hint_femp */
 270                                 hint_femp->eidx = EXFAT_HINT_NONE;
 271                                 return (dentry - (num_entries - 1));
 272                         }
 273                 }
 274
 275                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 276                         if (--clu.size > 0)
 277                                 clu.dir++;
 278                         else
 279                                 clu.dir = EXFAT_EOF_CLUSTER;
 280                 } else {
 281                         if (exfat_get_next_cluster(sb, &clu.dir))
 282                                 return -EIO;
 283                 }
 284         }
 285
 286         return -ENOSPC;
 287 }
 288
 289 static int exfat_check_max_dentries(struct inode *inode)
 290 {
 291         if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
 292                 /*
 293                  * exFAT spec allows a dir to grow up to 8388608(256MB)
 294                  * dentries
 295                  */
 296                 return -ENOSPC;
 297         }
 298         return 0;
 299 }
 300
 301 /* find empty directory entry.
 302  * if there isn't any empty slot, expand cluster chain.
 303  */
 304 static int exfat_find_empty_entry(struct inode *inode,
 305                 struct exfat_chain *p_dir, int num_entries)
 306 {
 307         int dentry;
 308         unsigned int ret, last_clu;
 309         sector_t sector;
 310         loff_t size = 0;
 311         struct exfat_chain clu;
 312         struct exfat_dentry *ep = NULL;
 313         struct super_block *sb = inode->i_sb;
 314         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 315         struct exfat_inode_info *ei = EXFAT_I(inode);
 316         struct exfat_hint_femp hint_femp;
 317
 318         hint_femp.eidx = EXFAT_HINT_NONE;
 319
 320         if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
 321                 hint_femp = ei->hint_femp;
 322                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 323         }
 324
 325         while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
 326                                         num_entries)) < 0) {
 327                 if (dentry == -EIO)
 328                         break;
 329
 330                 if (exfat_check_max_dentries(inode))
 331                         return -ENOSPC;
 332
 333                 /* we trust p_dir->size regardless of FAT type */
 334                 if (exfat_find_last_cluster(sb, p_dir, &last_clu))
 335                         return -EIO;
 336
 337                 /*
 338                  * Allocate new cluster to this directory
 339                  */
 340                 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
 341
 342                 /* allocate a cluster */
 343                 ret = exfat_alloc_cluster(inode, 1, &clu);
 344                 if (ret)
 345                         return ret;
 346
 347                 if (exfat_zeroed_cluster(inode, clu.dir))
 348                         return -EIO;
 349
 350                 /* append to the FAT chain */
 351                 if (clu.flags != p_dir->flags) {
 352                         /* no-fat-chain bit is disabled,
 353                          * so fat-chain should be synced with alloc-bitmap
 354                          */
 355                         exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
 356                         p_dir->flags = ALLOC_FAT_CHAIN;
 357                         hint_femp.cur.flags = ALLOC_FAT_CHAIN;
 358                 }
 359
 360                 if (clu.flags == ALLOC_FAT_CHAIN)
 361                         if (exfat_ent_set(sb, last_clu, clu.dir))
 362                                 return -EIO;
 363
 364                 if (hint_femp.eidx == EXFAT_HINT_NONE) {
 365                         /* the special case that new dentry
 366                          * should be allocated from the start of new cluster
 367                          */
 368                         hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi);
 369                         hint_femp.count = sbi->dentries_per_clu;
 370
 371                         exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
 372                 }
 373                 hint_femp.cur.size++;
 374                 p_dir->size++;
 375                 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
 376
 377                 /* update the directory entry */
 378                 if (p_dir->dir != sbi->root_dir) {
 379                         struct buffer_head *bh;
 380
 381                         ep = exfat_get_dentry(sb,
 382                                 &(ei->dir), ei->entry + 1, &bh, &sector);
 383                         if (!ep)
 384                                 return -EIO;
 385
 386                         ep->dentry.stream.valid_size = cpu_to_le64(size);
 387                         ep->dentry.stream.size = ep->dentry.stream.valid_size;
 388                         ep->dentry.stream.flags = p_dir->flags;
 389                         exfat_update_bh(bh, IS_DIRSYNC(inode));
 390                         brelse(bh);
 391                         if (exfat_update_dir_chksum(inode, &(ei->dir),
 392                             ei->entry))
 393                                 return -EIO;
 394                 }
 395
 396                 /* directory inode should be updated in here */
 397                 i_size_write(inode, size);
 398                 EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
 399                 EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
 400                 EXFAT_I(inode)->flags = p_dir->flags;
 401                 inode->i_blocks += 1 << sbi->sect_per_clus_bits;
 402         }
 403
 404         return dentry;
 405 }
 406
 407 /*
 408  * Name Resolution Functions :
 409  * Zero if it was successful; otherwise nonzero.
 410  */
 411 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
 412                 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
 413                 int lookup)
 414 {
 415         int namelen;
 416         int lossy = NLS_NAME_NO_LOSSY;
 417         struct super_block *sb = inode->i_sb;
 418         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 419         struct exfat_inode_info *ei = EXFAT_I(inode);
 420
 421         /* strip all trailing periods */
 422         namelen = exfat_striptail_len(strlen(path), path);
 423         if (!namelen)
 424                 return -ENOENT;
 425
 426         if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
 427                 return -ENAMETOOLONG;
 428
 429         /*
 430          * strip all leading spaces :
 431          * "MS windows 7" supports leading spaces.
 432          * So we should skip this preprocessing for compatibility.
 433          */
 434
 435         /* file name conversion :
 436          * If lookup case, we allow bad-name for compatibility.
 437          */
 438         namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
 439                         &lossy);
 440         if (namelen < 0)
 441                 return namelen; /* return error value */
 442
 443         if ((lossy && !lookup) || !namelen)
 444                 return -EINVAL;
 445
 446         exfat_chain_set(p_dir, ei->start_clu,
 447                 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
 448
 449         return 0;
 450 }
 451
 452 static inline int exfat_resolve_path(struct inode *inode,
 453                 const unsigned char *path, struct exfat_chain *dir,
 454                 struct exfat_uni_name *uni)
 455 {
 456         return __exfat_resolve_path(inode, path, dir, uni, 0);
 457 }
 458
 459 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
 460                 const unsigned char *path, struct exfat_chain *dir,
 461                 struct exfat_uni_name *uni)
 462 {
 463         return __exfat_resolve_path(inode, path, dir, uni, 1);
 464 }
 465
 466 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
 467 {
 468         return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
 469 }
 470
 471 static int exfat_add_entry(struct inode *inode, const char *path,
 472                 struct exfat_chain *p_dir, unsigned int type,
 473                 struct exfat_dir_entry *info)
 474 {
 475         int ret, dentry, num_entries;
 476         struct super_block *sb = inode->i_sb;
 477         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 478         struct exfat_uni_name uniname;
 479         struct exfat_chain clu;
 480         int clu_size = 0;
 481         unsigned int start_clu = EXFAT_FREE_CLUSTER;
 482
 483         ret = exfat_resolve_path(inode, path, p_dir, &uniname);
 484         if (ret)
 485                 goto out;
 486
 487         num_entries = exfat_calc_num_entries(&uniname);
 488         if (num_entries < 0) {
 489                 ret = num_entries;
 490                 goto out;
 491         }
 492
 493         /* exfat_find_empty_entry must be called before alloc_cluster() */
 494         dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
 495         if (dentry < 0) {
 496                 ret = dentry; /* -EIO or -ENOSPC */
 497                 goto out;
 498         }
 499
 500         if (type == TYPE_DIR) {
 501                 ret = exfat_alloc_new_dir(inode, &clu);
 502                 if (ret)
 503                         goto out;
 504                 start_clu = clu.dir;
 505                 clu_size = sbi->cluster_size;
 506         }
 507
 508         /* update the directory entry */
 509         /* fill the dos name directory entry information of the created file.
 510          * the first cluster is not determined yet. (0)
 511          */
 512         ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
 513                 start_clu, clu_size);
 514         if (ret)
 515                 goto out;
 516
 517         ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
 518         if (ret)
 519                 goto out;
 520
 521         info->dir = *p_dir;
 522         info->entry = dentry;
 523         info->flags = ALLOC_NO_FAT_CHAIN;
 524         info->type = type;
 525
 526         if (type == TYPE_FILE) {
 527                 info->attr = ATTR_ARCHIVE;
 528                 info->start_clu = EXFAT_EOF_CLUSTER;
 529                 info->size = 0;
 530                 info->num_subdirs = 0;
 531         } else {
 532                 info->attr = ATTR_SUBDIR;
 533                 info->start_clu = start_clu;
 534                 info->size = clu_size;
 535                 info->num_subdirs = EXFAT_MIN_SUBDIR;
 536         }
 537         memset(&info->crtime, 0, sizeof(info->crtime));
 538         memset(&info->mtime, 0, sizeof(info->mtime));
 539         memset(&info->atime, 0, sizeof(info->atime));
 540 out:
 541         return ret;
 542 }
 543
 544 static int exfat_create(struct user_namespace *mnt_userns, struct inode *dir,
 545                         struct dentry *dentry, umode_t mode, bool excl)
 546 {
 547         struct super_block *sb = dir->i_sb;
 548         struct inode *inode;
 549         struct exfat_chain cdir;
 550         struct exfat_dir_entry info;
 551         loff_t i_pos;
 552         int err;
 553
 554         mutex_lock(&EXFAT_SB(sb)->s_lock);
 555         exfat_set_volume_dirty(sb);
 556         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
 557                 &info);
 558         exfat_clear_volume_dirty(sb);
 559         if (err)
 560                 goto unlock;
 561
 562         inode_inc_iversion(dir);
 563         dir->i_ctime = dir->i_mtime = current_time(dir);
 564         if (IS_DIRSYNC(dir))
 565                 exfat_sync_inode(dir);
 566         else
 567                 mark_inode_dirty(dir);
 568
 569         i_pos = exfat_make_i_pos(&info);
 570         inode = exfat_build_inode(sb, &info, i_pos);
 571         err = PTR_ERR_OR_ZERO(inode);
 572         if (err)
 573                 goto unlock;
 574
 575         inode_inc_iversion(inode);
 576         inode->i_mtime = inode->i_atime = inode->i_ctime =
 577                 EXFAT_I(inode)->i_crtime = current_time(inode);
 578         exfat_truncate_atime(&inode->i_atime);
 579         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 580
 581         d_instantiate(dentry, inode);
 582 unlock:
 583         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 584         return err;
 585 }
 586
 587 /* lookup a file */
 588 static int exfat_find(struct inode *dir, struct qstr *qname,
 589                 struct exfat_dir_entry *info)
 590 {
 591         int ret, dentry, num_entries, count;
 592         struct exfat_chain cdir;
 593         struct exfat_uni_name uni_name;
 594         struct super_block *sb = dir->i_sb;
 595         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 596         struct exfat_inode_info *ei = EXFAT_I(dir);
 597         struct exfat_dentry *ep, *ep2;
 598         struct exfat_entry_set_cache *es;
 599
 600         if (qname->len == 0)
 601                 return -ENOENT;
 602
 603         /* check the validity of directory name in the given pathname */
 604         ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
 605         if (ret)
 606                 return ret;
 607
 608         num_entries = exfat_calc_num_entries(&uni_name);
 609         if (num_entries < 0)
 610                 return num_entries;
 611
 612         /* check the validation of hint_stat and initialize it if required */
 613         if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
 614                 ei->hint_stat.clu = cdir.dir;
 615                 ei->hint_stat.eidx = 0;
 616                 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
 617                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 618         }
 619
 620         /* search the file name for directories */
 621         dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name,
 622                         num_entries, TYPE_ALL);
 623
 624         if (dentry < 0)
 625                 return dentry; /* -error value */
 626
 627         info->dir = cdir;
 628         info->entry = dentry;
 629         info->num_subdirs = 0;
 630
 631         es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES);
 632         if (!es)
 633                 return -EIO;
 634         ep = exfat_get_dentry_cached(es, 0);
 635         ep2 = exfat_get_dentry_cached(es, 1);
 636
 637         info->type = exfat_get_entry_type(ep);
 638         info->attr = le16_to_cpu(ep->dentry.file.attr);
 639         info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
 640         if ((info->type == TYPE_FILE) && (info->size == 0)) {
 641                 info->flags = ALLOC_NO_FAT_CHAIN;
 642                 info->start_clu = EXFAT_EOF_CLUSTER;
 643         } else {
 644                 info->flags = ep2->dentry.stream.flags;
 645                 info->start_clu =
 646                         le32_to_cpu(ep2->dentry.stream.start_clu);
 647         }
 648
 649         exfat_get_entry_time(sbi, &info->crtime,
 650                              ep->dentry.file.create_tz,
 651                              ep->dentry.file.create_time,
 652                              ep->dentry.file.create_date,
 653                              ep->dentry.file.create_time_cs);
 654         exfat_get_entry_time(sbi, &info->mtime,
 655                              ep->dentry.file.modify_tz,
 656                              ep->dentry.file.modify_time,
 657                              ep->dentry.file.modify_date,
 658                              ep->dentry.file.modify_time_cs);
 659         exfat_get_entry_time(sbi, &info->atime,
 660                              ep->dentry.file.access_tz,
 661                              ep->dentry.file.access_time,
 662                              ep->dentry.file.access_date,
 663                              0);
 664         exfat_free_dentry_set(es, false);
 665
 666         if (ei->start_clu == EXFAT_FREE_CLUSTER) {
 667                 exfat_fs_error(sb,
 668                                "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
 669                                i_size_read(dir), ei->dir.dir, ei->entry);
 670                 return -EIO;
 671         }
 672
 673         if (info->type == TYPE_DIR) {
 674                 exfat_chain_set(&cdir, info->start_clu,
 675                                 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
 676                 count = exfat_count_dir_entries(sb, &cdir);
 677                 if (count < 0)
 678                         return -EIO;
 679
 680                 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
 681         }
 682         return 0;
 683 }
 684
 685 static int exfat_d_anon_disconn(struct dentry *dentry)
 686 {
 687         return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
 688 }
 689
 690 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
 691                 unsigned int flags)
 692 {
 693         struct super_block *sb = dir->i_sb;
 694         struct inode *inode;
 695         struct dentry *alias;
 696         struct exfat_dir_entry info;
 697         int err;
 698         loff_t i_pos;
 699         mode_t i_mode;
 700
 701         mutex_lock(&EXFAT_SB(sb)->s_lock);
 702         err = exfat_find(dir, &dentry->d_name, &info);
 703         if (err) {
 704                 if (err == -ENOENT) {
 705                         inode = NULL;
 706                         goto out;
 707                 }
 708                 goto unlock;
 709         }
 710
 711         i_pos = exfat_make_i_pos(&info);
 712         inode = exfat_build_inode(sb, &info, i_pos);
 713         err = PTR_ERR_OR_ZERO(inode);
 714         if (err)
 715                 goto unlock;
 716
 717         i_mode = inode->i_mode;
 718         alias = d_find_alias(inode);
 719
 720         /*
 721          * Checking "alias->d_parent == dentry->d_parent" to make sure
 722          * FS is not corrupted (especially double linked dir).
 723          */
 724         if (alias && alias->d_parent == dentry->d_parent &&
 725                         !exfat_d_anon_disconn(alias)) {
 726
 727                 /*
 728                  * Unhashed alias is able to exist because of revalidate()
 729                  * called by lookup_fast. You can easily make this status
 730                  * by calling create and lookup concurrently
 731                  * In such case, we reuse an alias instead of new dentry
 732                  */
 733                 if (d_unhashed(alias)) {
 734                         WARN_ON(alias->d_name.hash_len !=
 735                                 dentry->d_name.hash_len);
 736                         exfat_info(sb, "rehashed a dentry(%p) in read lookup",
 737                                    alias);
 738                         d_drop(dentry);
 739                         d_rehash(alias);
 740                 } else if (!S_ISDIR(i_mode)) {
 741                         /*
 742                          * This inode has non anonymous-DCACHE_DISCONNECTED
 743                          * dentry. This means, the user did ->lookup() by an
 744                          * another name (longname vs 8.3 alias of it) in past.
 745                          *
 746                          * Switch to new one for reason of locality if possible.
 747                          */
 748                         d_move(alias, dentry);
 749                 }
 750                 iput(inode);
 751                 mutex_unlock(&EXFAT_SB(sb)->s_lock);
 752                 return alias;
 753         }
 754         dput(alias);
 755 out:
 756         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 757         if (!inode)
 758                 exfat_d_version_set(dentry, inode_query_iversion(dir));
 759
 760         return d_splice_alias(inode, dentry);
 761 unlock:
 762         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 763         return ERR_PTR(err);
 764 }
 765
 766 /* remove an entry, BUT don't truncate */
 767 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
 768 {
 769         struct exfat_chain cdir;
 770         struct exfat_dentry *ep;
 771         struct super_block *sb = dir->i_sb;
 772         struct inode *inode = dentry->d_inode;
 773         struct exfat_inode_info *ei = EXFAT_I(inode);
 774         struct buffer_head *bh;
 775         sector_t sector;
 776         int num_entries, entry, err = 0;
 777
 778         mutex_lock(&EXFAT_SB(sb)->s_lock);
 779         exfat_chain_dup(&cdir, &ei->dir);
 780         entry = ei->entry;
 781         if (ei->dir.dir == DIR_DELETED) {
 782                 exfat_err(sb, "abnormal access to deleted dentry");
 783                 err = -ENOENT;
 784                 goto unlock;
 785         }
 786
 787         ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
 788         if (!ep) {
 789                 err = -EIO;
 790                 goto unlock;
 791         }
 792         num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
 793         if (num_entries < 0) {
 794                 err = -EIO;
 795                 brelse(bh);
 796                 goto unlock;
 797         }
 798         num_entries++;
 799         brelse(bh);
 800
 801         exfat_set_volume_dirty(sb);
 802         /* update the directory entry */
 803         if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
 804                 err = -EIO;
 805                 goto unlock;
 806         }
 807
 808         /* This doesn't modify ei */
 809         ei->dir.dir = DIR_DELETED;
 810         exfat_clear_volume_dirty(sb);
 811
 812         inode_inc_iversion(dir);
 813         dir->i_mtime = dir->i_atime = current_time(dir);
 814         exfat_truncate_atime(&dir->i_atime);
 815         if (IS_DIRSYNC(dir))
 816                 exfat_sync_inode(dir);
 817         else
 818                 mark_inode_dirty(dir);
 819
 820         clear_nlink(inode);
 821         inode->i_mtime = inode->i_atime = current_time(inode);
 822         exfat_truncate_atime(&inode->i_atime);
 823         exfat_unhash_inode(inode);
 824         exfat_d_version_set(dentry, inode_query_iversion(dir));
 825 unlock:
 826         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 827         return err;
 828 }
 829
 830 static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 831                        struct dentry *dentry, umode_t mode)
 832 {
 833         struct super_block *sb = dir->i_sb;
 834         struct inode *inode;
 835         struct exfat_dir_entry info;
 836         struct exfat_chain cdir;
 837         loff_t i_pos;
 838         int err;
 839
 840         mutex_lock(&EXFAT_SB(sb)->s_lock);
 841         exfat_set_volume_dirty(sb);
 842         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
 843                 &info);
 844         exfat_clear_volume_dirty(sb);
 845         if (err)
 846                 goto unlock;
 847
 848         inode_inc_iversion(dir);
 849         dir->i_ctime = dir->i_mtime = current_time(dir);
 850         if (IS_DIRSYNC(dir))
 851                 exfat_sync_inode(dir);
 852         else
 853                 mark_inode_dirty(dir);
 854         inc_nlink(dir);
 855
 856         i_pos = exfat_make_i_pos(&info);
 857         inode = exfat_build_inode(sb, &info, i_pos);
 858         err = PTR_ERR_OR_ZERO(inode);
 859         if (err)
 860                 goto unlock;
 861
 862         inode_inc_iversion(inode);
 863         inode->i_mtime = inode->i_atime = inode->i_ctime =
 864                 EXFAT_I(inode)->i_crtime = current_time(inode);
 865         exfat_truncate_atime(&inode->i_atime);
 866         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 867
 868         d_instantiate(dentry, inode);
 869
 870 unlock:
 871         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 872         return err;
 873 }
 874
 875 static int exfat_check_dir_empty(struct super_block *sb,
 876                 struct exfat_chain *p_dir)
 877 {
 878         int i, dentries_per_clu;
 879         unsigned int type;
 880         struct exfat_chain clu;
 881         struct exfat_dentry *ep;
 882         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 883         struct buffer_head *bh;
 884
 885         dentries_per_clu = sbi->dentries_per_clu;
 886
 887         exfat_chain_dup(&clu, p_dir);
 888
 889         while (clu.dir != EXFAT_EOF_CLUSTER) {
 890                 for (i = 0; i < dentries_per_clu; i++) {
 891                         ep = exfat_get_dentry(sb, &clu, i, &bh, NULL);
 892                         if (!ep)
 893                                 return -EIO;
 894                         type = exfat_get_entry_type(ep);
 895                         brelse(bh);
 896                         if (type == TYPE_UNUSED)
 897                                 return 0;
 898
 899                         if (type != TYPE_FILE && type != TYPE_DIR)
 900                                 continue;
 901
 902                         return -ENOTEMPTY;
 903                 }
 904
 905                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 906                         if (--clu.size > 0)
 907                                 clu.dir++;
 908                         else
 909                                 clu.dir = EXFAT_EOF_CLUSTER;
 910                 } else {
 911                         if (exfat_get_next_cluster(sb, &(clu.dir)))
 912                                 return -EIO;
 913                 }
 914         }
 915
 916         return 0;
 917 }
 918
 919 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
 920 {
 921         struct inode *inode = dentry->d_inode;
 922         struct exfat_dentry *ep;
 923         struct exfat_chain cdir, clu_to_free;
 924         struct super_block *sb = inode->i_sb;
 925         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 926         struct exfat_inode_info *ei = EXFAT_I(inode);
 927         struct buffer_head *bh;
 928         sector_t sector;
 929         int num_entries, entry, err;
 930
 931         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 932
 933         exfat_chain_dup(&cdir, &ei->dir);
 934         entry = ei->entry;
 935
 936         if (ei->dir.dir == DIR_DELETED) {
 937                 exfat_err(sb, "abnormal access to deleted dentry");
 938                 err = -ENOENT;
 939                 goto unlock;
 940         }
 941
 942         exfat_chain_set(&clu_to_free, ei->start_clu,
 943                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
 944
 945         err = exfat_check_dir_empty(sb, &clu_to_free);
 946         if (err) {
 947                 if (err == -EIO)
 948                         exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
 949                                   err);
 950                 goto unlock;
 951         }
 952
 953         ep = exfat_get_dentry(sb, &cdir, entry, &bh, &sector);
 954         if (!ep) {
 955                 err = -EIO;
 956                 goto unlock;
 957         }
 958
 959         num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
 960         if (num_entries < 0) {
 961                 err = -EIO;
 962                 brelse(bh);
 963                 goto unlock;
 964         }
 965         num_entries++;
 966         brelse(bh);
 967
 968         exfat_set_volume_dirty(sb);
 969         err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
 970         if (err) {
 971                 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
 972                 goto unlock;
 973         }
 974         ei->dir.dir = DIR_DELETED;
 975         exfat_clear_volume_dirty(sb);
 976
 977         inode_inc_iversion(dir);
 978         dir->i_mtime = dir->i_atime = current_time(dir);
 979         exfat_truncate_atime(&dir->i_atime);
 980         if (IS_DIRSYNC(dir))
 981                 exfat_sync_inode(dir);
 982         else
 983                 mark_inode_dirty(dir);
 984         drop_nlink(dir);
 985
 986         clear_nlink(inode);
 987         inode->i_mtime = inode->i_atime = current_time(inode);
 988         exfat_truncate_atime(&inode->i_atime);
 989         exfat_unhash_inode(inode);
 990         exfat_d_version_set(dentry, inode_query_iversion(dir));
 991 unlock:
 992         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
 993         return err;
 994 }
 995
 996 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 997                 int oldentry, struct exfat_uni_name *p_uniname,
 998                 struct exfat_inode_info *ei)
 999 {
1000         int ret, num_old_entries, num_new_entries;
1001         sector_t sector_old, sector_new;
1002         struct exfat_dentry *epold, *epnew;
1003         struct super_block *sb = inode->i_sb;
1004         struct buffer_head *new_bh, *old_bh;
1005         int sync = IS_DIRSYNC(inode);
1006
1007         epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, &sector_old);
1008         if (!epold)
1009                 return -EIO;
1010
1011         num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1012         if (num_old_entries < 0)
1013                 return -EIO;
1014         num_old_entries++;
1015
1016         num_new_entries = exfat_calc_num_entries(p_uniname);
1017         if (num_new_entries < 0)
1018                 return num_new_entries;
1019
1020         if (num_old_entries < num_new_entries) {
1021                 int newentry;
1022
1023                 newentry =
1024                         exfat_find_empty_entry(inode, p_dir, num_new_entries);
1025                 if (newentry < 0)
1026                         return newentry; /* -EIO or -ENOSPC */
1027
1028                 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh,
1029                         &sector_new);
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                         &sector_old);
1044                 if (!epold)
1045                         return -EIO;
1046                 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
1047                         &sector_new);
1048                 if (!epnew) {
1049                         brelse(old_bh);
1050                         return -EIO;
1051                 }
1052
1053                 *epnew = *epold;
1054                 exfat_update_bh(new_bh, sync);
1055                 brelse(old_bh);
1056                 brelse(new_bh);
1057
1058                 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1059                         num_new_entries, p_uniname);
1060                 if (ret)
1061                         return ret;
1062
1063                 exfat_remove_entries(inode, p_dir, oldentry, 0,
1064                         num_old_entries);
1065                 ei->entry = newentry;
1066         } else {
1067                 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1068                         epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1069                         ei->attr |= ATTR_ARCHIVE;
1070                 }
1071                 exfat_update_bh(old_bh, sync);
1072                 brelse(old_bh);
1073                 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1074                         num_new_entries, p_uniname);
1075                 if (ret)
1076                         return ret;
1077
1078                 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1079                         num_old_entries);
1080         }
1081         return 0;
1082 }
1083
1084 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1085                 int oldentry, struct exfat_chain *p_newdir,
1086                 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1087 {
1088         int ret, newentry, num_new_entries, num_old_entries;
1089         sector_t sector_mov, sector_new;
1090         struct exfat_dentry *epmov, *epnew;
1091         struct super_block *sb = inode->i_sb;
1092         struct buffer_head *mov_bh, *new_bh;
1093
1094         epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, &sector_mov);
1095         if (!epmov)
1096                 return -EIO;
1097
1098         num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1099                 epmov);
1100         if (num_old_entries < 0)
1101                 return -EIO;
1102         num_old_entries++;
1103
1104         num_new_entries = exfat_calc_num_entries(p_uniname);
1105         if (num_new_entries < 0)
1106                 return num_new_entries;
1107
1108         newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1109         if (newentry < 0)
1110                 return newentry; /* -EIO or -ENOSPC */
1111
1112         epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, &sector_new);
1113         if (!epnew)
1114                 return -EIO;
1115
1116         *epnew = *epmov;
1117         if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1118                 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE);
1119                 ei->attr |= ATTR_ARCHIVE;
1120         }
1121         exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1122         brelse(mov_bh);
1123         brelse(new_bh);
1124
1125         epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh,
1126                 &sector_mov);
1127         if (!epmov)
1128                 return -EIO;
1129         epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh,
1130                 &sector_new);
1131         if (!epnew) {
1132                 brelse(mov_bh);
1133                 return -EIO;
1134         }
1135
1136         *epnew = *epmov;
1137         exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1138         brelse(mov_bh);
1139         brelse(new_bh);
1140
1141         ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1142                 p_uniname);
1143         if (ret)
1144                 return ret;
1145
1146         exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1147
1148         exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1149                 p_newdir->flags);
1150
1151         ei->entry = newentry;
1152         return 0;
1153 }
1154
1155 static void exfat_update_parent_info(struct exfat_inode_info *ei,
1156                 struct inode *parent_inode)
1157 {
1158         struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb);
1159         struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode);
1160         loff_t parent_isize = i_size_read(parent_inode);
1161
1162         /*
1163          * the problem that struct exfat_inode_info caches wrong parent info.
1164          *
1165          * because of flag-mismatch of ei->dir,
1166          * there is abnormal traversing cluster chain.
1167          */
1168         if (unlikely(parent_ei->flags != ei->dir.flags ||
1169                      parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) ||
1170                      parent_ei->start_clu != ei->dir.dir)) {
1171                 exfat_chain_set(&ei->dir, parent_ei->start_clu,
1172                         EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi),
1173                         parent_ei->flags);
1174         }
1175 }
1176
1177 /* rename or move a old file into a new file */
1178 static int __exfat_rename(struct inode *old_parent_inode,
1179                 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1180                 struct dentry *new_dentry)
1181 {
1182         int ret;
1183         int dentry;
1184         struct exfat_chain olddir, newdir;
1185         struct exfat_chain *p_dir = NULL;
1186         struct exfat_uni_name uni_name;
1187         struct exfat_dentry *ep;
1188         struct super_block *sb = old_parent_inode->i_sb;
1189         struct exfat_sb_info *sbi = EXFAT_SB(sb);
1190         const unsigned char *new_path = new_dentry->d_name.name;
1191         struct inode *new_inode = new_dentry->d_inode;
1192         int num_entries;
1193         struct exfat_inode_info *new_ei = NULL;
1194         unsigned int new_entry_type = TYPE_UNUSED;
1195         int new_entry = 0;
1196         struct buffer_head *old_bh, *new_bh = NULL;
1197
1198         /* check the validity of pointer parameters */
1199         if (new_path == NULL || strlen(new_path) == 0)
1200                 return -EINVAL;
1201
1202         if (ei->dir.dir == DIR_DELETED) {
1203                 exfat_err(sb, "abnormal access to deleted source dentry");
1204                 return -ENOENT;
1205         }
1206
1207         exfat_update_parent_info(ei, old_parent_inode);
1208
1209         exfat_chain_dup(&olddir, &ei->dir);
1210         dentry = ei->entry;
1211
1212         ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
1213         if (!ep) {
1214                 ret = -EIO;
1215                 goto out;
1216         }
1217         brelse(old_bh);
1218
1219         /* check whether new dir is existing directory and empty */
1220         if (new_inode) {
1221                 ret = -EIO;
1222                 new_ei = EXFAT_I(new_inode);
1223
1224                 if (new_ei->dir.dir == DIR_DELETED) {
1225                         exfat_err(sb, "abnormal access to deleted target dentry");
1226                         goto out;
1227                 }
1228
1229                 exfat_update_parent_info(new_ei, new_parent_inode);
1230
1231                 p_dir = &(new_ei->dir);
1232                 new_entry = new_ei->entry;
1233                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1234                 if (!ep)
1235                         goto out;
1236
1237                 new_entry_type = exfat_get_entry_type(ep);
1238                 brelse(new_bh);
1239
1240                 /* if new_inode exists, update ei */
1241                 if (new_entry_type == TYPE_DIR) {
1242                         struct exfat_chain new_clu;
1243
1244                         new_clu.dir = new_ei->start_clu;
1245                         new_clu.size =
1246                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1247                                 sbi);
1248                         new_clu.flags = new_ei->flags;
1249
1250                         ret = exfat_check_dir_empty(sb, &new_clu);
1251                         if (ret)
1252                                 goto out;
1253                 }
1254         }
1255
1256         /* check the validity of directory name in the given new pathname */
1257         ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1258                         &uni_name);
1259         if (ret)
1260                 goto out;
1261
1262         exfat_set_volume_dirty(sb);
1263
1264         if (olddir.dir == newdir.dir)
1265                 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1266                                 &uni_name, ei);
1267         else
1268                 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1269                                 &newdir, &uni_name, ei);
1270
1271         if (!ret && new_inode) {
1272                 /* delete entries of new_dir */
1273                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
1274                 if (!ep) {
1275                         ret = -EIO;
1276                         goto del_out;
1277                 }
1278
1279                 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1280                 if (num_entries < 0) {
1281                         ret = -EIO;
1282                         goto del_out;
1283                 }
1284                 brelse(new_bh);
1285
1286                 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1287                                 num_entries + 1)) {
1288                         ret = -EIO;
1289                         goto del_out;
1290                 }
1291
1292                 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1293                 if (new_entry_type == TYPE_DIR) {
1294                         /* new_ei, new_clu_to_free */
1295                         struct exfat_chain new_clu_to_free;
1296
1297                         exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1298                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1299                                 sbi), new_ei->flags);
1300
1301                         if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1302                                 /* just set I/O error only */
1303                                 ret = -EIO;
1304                         }
1305
1306                         i_size_write(new_inode, 0);
1307                         new_ei->start_clu = EXFAT_EOF_CLUSTER;
1308                         new_ei->flags = ALLOC_NO_FAT_CHAIN;
1309                 }
1310 del_out:
1311                 /* Update new_inode ei
1312                  * Prevent syncing removed new_inode
1313                  * (new_ei is already initialized above code ("if (new_inode)")
1314                  */
1315                 new_ei->dir.dir = DIR_DELETED;
1316         }
1317         exfat_clear_volume_dirty(sb);
1318 out:
1319         return ret;
1320 }
1321
1322 static int exfat_rename(struct user_namespace *mnt_userns,
1323                         struct inode *old_dir, struct dentry *old_dentry,
1324                         struct inode *new_dir, struct dentry *new_dentry,
1325                         unsigned int flags)
1326 {
1327         struct inode *old_inode, *new_inode;
1328         struct super_block *sb = old_dir->i_sb;
1329         loff_t i_pos;
1330         int err;
1331
1332         /*
1333          * The VFS already checks for existence, so for local filesystems
1334          * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1335          * Don't support any other flags
1336          */
1337         if (flags & ~RENAME_NOREPLACE)
1338                 return -EINVAL;
1339
1340         mutex_lock(&EXFAT_SB(sb)->s_lock);
1341         old_inode = old_dentry->d_inode;
1342         new_inode = new_dentry->d_inode;
1343
1344         err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1345         if (err)
1346                 goto unlock;
1347
1348         inode_inc_iversion(new_dir);
1349         new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime =
1350                 EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1351         exfat_truncate_atime(&new_dir->i_atime);
1352         if (IS_DIRSYNC(new_dir))
1353                 exfat_sync_inode(new_dir);
1354         else
1355                 mark_inode_dirty(new_dir);
1356
1357         i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1358                 (EXFAT_I(old_inode)->entry & 0xffffffff);
1359         exfat_unhash_inode(old_inode);
1360         exfat_hash_inode(old_inode, i_pos);
1361         if (IS_DIRSYNC(new_dir))
1362                 exfat_sync_inode(old_inode);
1363         else
1364                 mark_inode_dirty(old_inode);
1365
1366         if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1367                 drop_nlink(old_dir);
1368                 if (!new_inode)
1369                         inc_nlink(new_dir);
1370         }
1371
1372         inode_inc_iversion(old_dir);
1373         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1374         if (IS_DIRSYNC(old_dir))
1375                 exfat_sync_inode(old_dir);
1376         else
1377                 mark_inode_dirty(old_dir);
1378
1379         if (new_inode) {
1380                 exfat_unhash_inode(new_inode);
1381
1382                 /* skip drop_nlink if new_inode already has been dropped */
1383                 if (new_inode->i_nlink) {
1384                         drop_nlink(new_inode);
1385                         if (S_ISDIR(new_inode->i_mode))
1386                                 drop_nlink(new_inode);
1387                 } else {
1388                         exfat_warn(sb, "abnormal access to an inode dropped");
1389                         WARN_ON(new_inode->i_nlink == 0);
1390                 }
1391                 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime =
1392                         current_time(new_inode);
1393         }
1394
1395 unlock:
1396         mutex_unlock(&EXFAT_SB(sb)->s_lock);
1397         return err;
1398 }
1399
1400 const struct inode_operations exfat_dir_inode_operations = {
1401         .create         = exfat_create,
1402         .lookup         = exfat_lookup,
1403         .unlink         = exfat_unlink,
1404         .mkdir          = exfat_mkdir,
1405         .rmdir          = exfat_rmdir,
1406         .rename         = exfat_rename,
1407         .setattr        = exfat_setattr,
1408         .getattr        = exfat_getattr,
1409 };