fs/exfat/namei.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
   4  */
   5
   6 #include <linux/iversion.h>
   7 #include <linux/namei.h>
   8 #include <linux/slab.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/nls.h>
  11
  12 #include "exfat_raw.h"
  13 #include "exfat_fs.h"
  14
  15 static inline unsigned long exfat_d_version(struct dentry *dentry)
  16 {
  17         return (unsigned long) dentry->d_fsdata;
  18 }
  19
  20 static inline void exfat_d_version_set(struct dentry *dentry,
  21                 unsigned long version)
  22 {
  23         dentry->d_fsdata = (void *) version;
  24 }
  25
  26 /*
  27  * If new entry was created in the parent, it could create the 8.3 alias (the
  28  * shortname of logname).  So, the parent may have the negative-dentry which
  29  * matches the created 8.3 alias.
  30  *
  31  * If it happened, the negative dentry isn't actually negative anymore.  So,
  32  * drop it.
  33  */
  34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags)
  35 {
  36         int ret;
  37
  38         if (flags & LOOKUP_RCU)
  39                 return -ECHILD;
  40
  41         /*
  42          * This is not negative dentry. Always valid.
  43          *
  44          * Note, rename() to existing directory entry will have ->d_inode, and
  45          * will use existing name which isn't specified name by user.
  46          *
  47          * We may be able to drop this positive dentry here. But dropping
  48          * positive dentry isn't good idea. So it's unsupported like
  49          * rename("filename", "FILENAME") for now.
  50          */
  51         if (d_really_is_positive(dentry))
  52                 return 1;
  53
  54         /*
  55          * Drop the negative dentry, in order to make sure to use the case
  56          * sensitive name which is specified by user if this is for creation.
  57          */
  58         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
  59                 return 0;
  60
  61         spin_lock(&dentry->d_lock);
  62         ret = inode_eq_iversion(d_inode(dentry->d_parent),
  63                         exfat_d_version(dentry));
  64         spin_unlock(&dentry->d_lock);
  65         return ret;
  66 }
  67
  68 /* returns the length of a struct qstr, ignoring trailing dots if necessary */
  69 static unsigned int exfat_striptail_len(unsigned int len, const char *name,
  70                                         bool keep_last_dots)
  71 {
  72         if (!keep_last_dots) {
  73                 while (len && name[len - 1] == '.')
  74                         len--;
  75         }
  76         return len;
  77 }
  78
  79 /*
  80  * Compute the hash for the exfat name corresponding to the dentry.  If the name
  81  * is invalid, we leave the hash code unchanged so that the existing dentry can
  82  * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate.
  83  */
  84 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr)
  85 {
  86         struct super_block *sb = dentry->d_sb;
  87         struct nls_table *t = EXFAT_SB(sb)->nls_io;
  88         const unsigned char *name = qstr->name;
  89         unsigned int len = exfat_striptail_len(qstr->len, qstr->name,
  90                            EXFAT_SB(sb)->options.keep_last_dots);
  91         unsigned long hash = init_name_hash(dentry);
  92         int i, charlen;
  93         wchar_t c;
  94
  95         for (i = 0; i < len; i += charlen) {
  96                 charlen = t->char2uni(&name[i], len - i, &c);
  97                 if (charlen < 0)
  98                         return charlen;
  99                 hash = partial_name_hash(exfat_toupper(sb, c), hash);
 100         }
 101
 102         qstr->hash = end_name_hash(hash);
 103         return 0;
 104 }
 105
 106 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len,
 107                 const char *str, const struct qstr *name)
 108 {
 109         struct super_block *sb = dentry->d_sb;
 110         struct nls_table *t = EXFAT_SB(sb)->nls_io;
 111         unsigned int alen = exfat_striptail_len(name->len, name->name,
 112                                 EXFAT_SB(sb)->options.keep_last_dots);
 113         unsigned int blen = exfat_striptail_len(len, str,
 114                                 EXFAT_SB(sb)->options.keep_last_dots);
 115         wchar_t c1, c2;
 116         int charlen, i;
 117
 118         if (alen != blen)
 119                 return 1;
 120
 121         for (i = 0; i < len; i += charlen) {
 122                 charlen = t->char2uni(&name->name[i], alen - i, &c1);
 123                 if (charlen < 0)
 124                         return 1;
 125                 if (charlen != t->char2uni(&str[i], blen - i, &c2))
 126                         return 1;
 127
 128                 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2))
 129                         return 1;
 130         }
 131
 132         return 0;
 133 }
 134
 135 const struct dentry_operations exfat_dentry_ops = {
 136         .d_revalidate   = exfat_d_revalidate,
 137         .d_hash         = exfat_d_hash,
 138         .d_compare      = exfat_d_cmp,
 139 };
 140
 141 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr)
 142 {
 143         struct super_block *sb = dentry->d_sb;
 144         const unsigned char *name = qstr->name;
 145         unsigned int len = exfat_striptail_len(qstr->len, qstr->name,
 146                                EXFAT_SB(sb)->options.keep_last_dots);
 147         unsigned long hash = init_name_hash(dentry);
 148         int i, charlen;
 149         unicode_t u;
 150
 151         for (i = 0; i < len; i += charlen) {
 152                 charlen = utf8_to_utf32(&name[i], len - i, &u);
 153                 if (charlen < 0)
 154                         return charlen;
 155
 156                 /*
 157                  * exfat_toupper() works only for code points up to the U+FFFF.
 158                  */
 159                 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u,
 160                                          hash);
 161         }
 162
 163         qstr->hash = end_name_hash(hash);
 164         return 0;
 165 }
 166
 167 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len,
 168                 const char *str, const struct qstr *name)
 169 {
 170         struct super_block *sb = dentry->d_sb;
 171         unsigned int alen = exfat_striptail_len(name->len, name->name,
 172                                 EXFAT_SB(sb)->options.keep_last_dots);
 173         unsigned int blen = exfat_striptail_len(len, str,
 174                                 EXFAT_SB(sb)->options.keep_last_dots);
 175
 176         unicode_t u_a, u_b;
 177         int charlen, i;
 178
 179         if (alen != blen)
 180                 return 1;
 181
 182         for (i = 0; i < alen; i += charlen) {
 183                 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a);
 184                 if (charlen < 0)
 185                         return 1;
 186                 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b))
 187                         return 1;
 188
 189                 if (u_a <= 0xFFFF && u_b <= 0xFFFF) {
 190                         if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b))
 191                                 return 1;
 192                 } else {
 193                         if (u_a != u_b)
 194                                 return 1;
 195                 }
 196         }
 197
 198         return 0;
 199 }
 200
 201 const struct dentry_operations exfat_utf8_dentry_ops = {
 202         .d_revalidate   = exfat_d_revalidate,
 203         .d_hash         = exfat_utf8_d_hash,
 204         .d_compare      = exfat_utf8_d_cmp,
 205 };
 206
 207 /* used only in search empty_slot() */
 208 #define CNT_UNUSED_NOHIT        (-1)
 209 #define CNT_UNUSED_HIT          (-2)
 210 /* search EMPTY CONTINUOUS "num_entries" entries */
 211 static int exfat_search_empty_slot(struct super_block *sb,
 212                 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir,
 213                 int num_entries)
 214 {
 215         int i, dentry, num_empty = 0;
 216         int dentries_per_clu;
 217         unsigned int type;
 218         struct exfat_chain clu;
 219         struct exfat_dentry *ep;
 220         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 221         struct buffer_head *bh;
 222
 223         dentries_per_clu = sbi->dentries_per_clu;
 224
 225         if (hint_femp->eidx != EXFAT_HINT_NONE) {
 226                 dentry = hint_femp->eidx;
 227
 228                 /*
 229                  * If hint_femp->count is enough, it is needed to check if
 230                  * there are actual empty entries.
 231                  * Otherwise, and if "dentry + hint_famp->count" is also equal
 232                  * to "p_dir->size * dentries_per_clu", it means ENOSPC.
 233                  */
 234                 if (dentry + hint_femp->count == p_dir->size * dentries_per_clu &&
 235                     num_entries > hint_femp->count)
 236                         return -ENOSPC;
 237
 238                 hint_femp->eidx = EXFAT_HINT_NONE;
 239                 exfat_chain_dup(&clu, &hint_femp->cur);
 240         } else {
 241                 exfat_chain_dup(&clu, p_dir);
 242                 dentry = 0;
 243         }
 244
 245         while (clu.dir != EXFAT_EOF_CLUSTER) {
 246                 i = dentry & (dentries_per_clu - 1);
 247
 248                 for (; i < dentries_per_clu; i++, dentry++) {
 249                         ep = exfat_get_dentry(sb, &clu, i, &bh);
 250                         if (!ep)
 251                                 return -EIO;
 252                         type = exfat_get_entry_type(ep);
 253                         brelse(bh);
 254
 255                         if (type == TYPE_UNUSED || type == TYPE_DELETED) {
 256                                 num_empty++;
 257                                 if (hint_femp->eidx == EXFAT_HINT_NONE) {
 258                                         hint_femp->eidx = dentry;
 259                                         hint_femp->count = CNT_UNUSED_NOHIT;
 260                                         exfat_chain_set(&hint_femp->cur,
 261                                                 clu.dir, clu.size, clu.flags);
 262                                 }
 263
 264                                 if (type == TYPE_UNUSED &&
 265                                     hint_femp->count != CNT_UNUSED_HIT)
 266                                         hint_femp->count = CNT_UNUSED_HIT;
 267                         } else {
 268                                 if (hint_femp->eidx != EXFAT_HINT_NONE &&
 269                                     hint_femp->count == CNT_UNUSED_HIT) {
 270                                         /* unused empty group means
 271                                          * an empty group which includes
 272                                          * unused dentry
 273                                          */
 274                                         exfat_fs_error(sb,
 275                                                 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)",
 276                                                 dentry, hint_femp->eidx,
 277                                                 p_dir->dir, clu.dir);
 278                                         return -EIO;
 279                                 }
 280
 281                                 num_empty = 0;
 282                                 hint_femp->eidx = EXFAT_HINT_NONE;
 283                         }
 284
 285                         if (num_empty >= num_entries) {
 286                                 /* found and invalidate hint_femp */
 287                                 hint_femp->eidx = EXFAT_HINT_NONE;
 288                                 return (dentry - (num_entries - 1));
 289                         }
 290                 }
 291
 292                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 293                         if (--clu.size > 0)
 294                                 clu.dir++;
 295                         else
 296                                 clu.dir = EXFAT_EOF_CLUSTER;
 297                 } else {
 298                         if (exfat_get_next_cluster(sb, &clu.dir))
 299                                 return -EIO;
 300                 }
 301         }
 302
 303         hint_femp->eidx = p_dir->size * dentries_per_clu - num_empty;
 304         hint_femp->count = num_empty;
 305         if (num_empty == 0)
 306                 exfat_chain_set(&hint_femp->cur, EXFAT_EOF_CLUSTER, 0,
 307                                 clu.flags);
 308
 309         return -ENOSPC;
 310 }
 311
 312 static int exfat_check_max_dentries(struct inode *inode)
 313 {
 314         if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) {
 315                 /*
 316                  * exFAT spec allows a dir to grow up to 8388608(256MB)
 317                  * dentries
 318                  */
 319                 return -ENOSPC;
 320         }
 321         return 0;
 322 }
 323
 324 /* find empty directory entry.
 325  * if there isn't any empty slot, expand cluster chain.
 326  */
 327 static int exfat_find_empty_entry(struct inode *inode,
 328                 struct exfat_chain *p_dir, int num_entries)
 329 {
 330         int dentry;
 331         unsigned int ret, last_clu;
 332         loff_t size = 0;
 333         struct exfat_chain clu;
 334         struct super_block *sb = inode->i_sb;
 335         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 336         struct exfat_inode_info *ei = EXFAT_I(inode);
 337         struct exfat_hint_femp hint_femp;
 338
 339         hint_femp.eidx = EXFAT_HINT_NONE;
 340
 341         if (ei->hint_femp.eidx != EXFAT_HINT_NONE) {
 342                 hint_femp = ei->hint_femp;
 343                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 344         }
 345
 346         while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir,
 347                                         num_entries)) < 0) {
 348                 if (dentry == -EIO)
 349                         break;
 350
 351                 if (exfat_check_max_dentries(inode))
 352                         return -ENOSPC;
 353
 354                 /*
 355                  * Allocate new cluster to this directory
 356                  */
 357                 if (ei->start_clu != EXFAT_EOF_CLUSTER) {
 358                         /* we trust p_dir->size regardless of FAT type */
 359                         if (exfat_find_last_cluster(sb, p_dir, &last_clu))
 360                                 return -EIO;
 361
 362                         exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags);
 363                 } else {
 364                         /* This directory is empty */
 365                         exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0,
 366                                         ALLOC_NO_FAT_CHAIN);
 367                 }
 368
 369                 /* allocate a cluster */
 370                 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode));
 371                 if (ret)
 372                         return ret;
 373
 374                 if (exfat_zeroed_cluster(inode, clu.dir))
 375                         return -EIO;
 376
 377                 if (ei->start_clu == EXFAT_EOF_CLUSTER) {
 378                         ei->start_clu = clu.dir;
 379                         p_dir->dir = clu.dir;
 380                 }
 381
 382                 /* append to the FAT chain */
 383                 if (clu.flags != p_dir->flags) {
 384                         /* no-fat-chain bit is disabled,
 385                          * so fat-chain should be synced with alloc-bitmap
 386                          */
 387                         exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size);
 388                         p_dir->flags = ALLOC_FAT_CHAIN;
 389                         hint_femp.cur.flags = ALLOC_FAT_CHAIN;
 390                 }
 391
 392                 if (clu.flags == ALLOC_FAT_CHAIN)
 393                         if (exfat_ent_set(sb, last_clu, clu.dir))
 394                                 return -EIO;
 395
 396                 if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER)
 397                         exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags);
 398
 399                 hint_femp.count += sbi->dentries_per_clu;
 400
 401                 hint_femp.cur.size++;
 402                 p_dir->size++;
 403                 size = EXFAT_CLU_TO_B(p_dir->size, sbi);
 404
 405                 /* directory inode should be updated in here */
 406                 i_size_write(inode, size);
 407                 ei->i_size_ondisk += sbi->cluster_size;
 408                 ei->i_size_aligned += sbi->cluster_size;
 409                 ei->valid_size += sbi->cluster_size;
 410                 ei->flags = p_dir->flags;
 411                 inode->i_blocks += sbi->cluster_size >> 9;
 412         }
 413
 414         return dentry;
 415 }
 416
 417 /*
 418  * Name Resolution Functions :
 419  * Zero if it was successful; otherwise nonzero.
 420  */
 421 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path,
 422                 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
 423                 int lookup)
 424 {
 425         int namelen;
 426         int lossy = NLS_NAME_NO_LOSSY;
 427         struct super_block *sb = inode->i_sb;
 428         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 429         struct exfat_inode_info *ei = EXFAT_I(inode);
 430         int pathlen = strlen(path);
 431
 432         /*
 433          * get the length of the pathname excluding
 434          * trailing periods, if any.
 435          */
 436         namelen = exfat_striptail_len(pathlen, path, false);
 437         if (EXFAT_SB(sb)->options.keep_last_dots) {
 438                 /*
 439                  * Do not allow the creation of files with names
 440                  * ending with period(s).
 441                  */
 442                 if (!lookup && (namelen < pathlen))
 443                         return -EINVAL;
 444                 namelen = pathlen;
 445         }
 446         if (!namelen)
 447                 return -ENOENT;
 448         if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE))
 449                 return -ENAMETOOLONG;
 450
 451         /*
 452          * strip all leading spaces :
 453          * "MS windows 7" supports leading spaces.
 454          * So we should skip this preprocessing for compatibility.
 455          */
 456
 457         /* file name conversion :
 458          * If lookup case, we allow bad-name for compatibility.
 459          */
 460         namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname,
 461                         &lossy);
 462         if (namelen < 0)
 463                 return namelen; /* return error value */
 464
 465         if ((lossy && !lookup) || !namelen)
 466                 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL;
 467
 468         exfat_chain_set(p_dir, ei->start_clu,
 469                 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags);
 470
 471         return 0;
 472 }
 473
 474 static inline int exfat_resolve_path(struct inode *inode,
 475                 const unsigned char *path, struct exfat_chain *dir,
 476                 struct exfat_uni_name *uni)
 477 {
 478         return __exfat_resolve_path(inode, path, dir, uni, 0);
 479 }
 480
 481 static inline int exfat_resolve_path_for_lookup(struct inode *inode,
 482                 const unsigned char *path, struct exfat_chain *dir,
 483                 struct exfat_uni_name *uni)
 484 {
 485         return __exfat_resolve_path(inode, path, dir, uni, 1);
 486 }
 487
 488 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info)
 489 {
 490         return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff);
 491 }
 492
 493 static int exfat_add_entry(struct inode *inode, const char *path,
 494                 struct exfat_chain *p_dir, unsigned int type,
 495                 struct exfat_dir_entry *info)
 496 {
 497         int ret, dentry, num_entries;
 498         struct super_block *sb = inode->i_sb;
 499         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 500         struct exfat_uni_name uniname;
 501         struct exfat_chain clu;
 502         int clu_size = 0;
 503         unsigned int start_clu = EXFAT_FREE_CLUSTER;
 504
 505         ret = exfat_resolve_path(inode, path, p_dir, &uniname);
 506         if (ret)
 507                 goto out;
 508
 509         num_entries = exfat_calc_num_entries(&uniname);
 510         if (num_entries < 0) {
 511                 ret = num_entries;
 512                 goto out;
 513         }
 514
 515         /* exfat_find_empty_entry must be called before alloc_cluster() */
 516         dentry = exfat_find_empty_entry(inode, p_dir, num_entries);
 517         if (dentry < 0) {
 518                 ret = dentry; /* -EIO or -ENOSPC */
 519                 goto out;
 520         }
 521
 522         if (type == TYPE_DIR && !sbi->options.zero_size_dir) {
 523                 ret = exfat_alloc_new_dir(inode, &clu);
 524                 if (ret)
 525                         goto out;
 526                 start_clu = clu.dir;
 527                 clu_size = sbi->cluster_size;
 528         }
 529
 530         /* update the directory entry */
 531         /* fill the dos name directory entry information of the created file.
 532          * the first cluster is not determined yet. (0)
 533          */
 534         ret = exfat_init_dir_entry(inode, p_dir, dentry, type,
 535                 start_clu, clu_size);
 536         if (ret)
 537                 goto out;
 538
 539         ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname);
 540         if (ret)
 541                 goto out;
 542
 543         info->dir = *p_dir;
 544         info->entry = dentry;
 545         info->flags = ALLOC_NO_FAT_CHAIN;
 546         info->type = type;
 547
 548         if (type == TYPE_FILE) {
 549                 info->attr = EXFAT_ATTR_ARCHIVE;
 550                 info->start_clu = EXFAT_EOF_CLUSTER;
 551                 info->size = 0;
 552                 info->num_subdirs = 0;
 553         } else {
 554                 info->attr = EXFAT_ATTR_SUBDIR;
 555                 if (sbi->options.zero_size_dir)
 556                         info->start_clu = EXFAT_EOF_CLUSTER;
 557                 else
 558                         info->start_clu = start_clu;
 559                 info->size = clu_size;
 560                 info->num_subdirs = EXFAT_MIN_SUBDIR;
 561         }
 562         info->valid_size = info->size;
 563
 564         memset(&info->crtime, 0, sizeof(info->crtime));
 565         memset(&info->mtime, 0, sizeof(info->mtime));
 566         memset(&info->atime, 0, sizeof(info->atime));
 567 out:
 568         return ret;
 569 }
 570
 571 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir,
 572                         struct dentry *dentry, umode_t mode, bool excl)
 573 {
 574         struct super_block *sb = dir->i_sb;
 575         struct inode *inode;
 576         struct exfat_chain cdir;
 577         struct exfat_dir_entry info;
 578         loff_t i_pos;
 579         int err;
 580
 581         mutex_lock(&EXFAT_SB(sb)->s_lock);
 582         exfat_set_volume_dirty(sb);
 583         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE,
 584                 &info);
 585         if (err)
 586                 goto unlock;
 587
 588         inode_inc_iversion(dir);
 589         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 590         if (IS_DIRSYNC(dir))
 591                 exfat_sync_inode(dir);
 592         else
 593                 mark_inode_dirty(dir);
 594
 595         i_pos = exfat_make_i_pos(&info);
 596         inode = exfat_build_inode(sb, &info, i_pos);
 597         err = PTR_ERR_OR_ZERO(inode);
 598         if (err)
 599                 goto unlock;
 600
 601         inode_inc_iversion(inode);
 602         EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
 603         exfat_truncate_inode_atime(inode);
 604
 605         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 606
 607         d_instantiate(dentry, inode);
 608 unlock:
 609         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 610         return err;
 611 }
 612
 613 /* lookup a file */
 614 static int exfat_find(struct inode *dir, struct qstr *qname,
 615                 struct exfat_dir_entry *info)
 616 {
 617         int ret, dentry, count;
 618         struct exfat_chain cdir;
 619         struct exfat_uni_name uni_name;
 620         struct super_block *sb = dir->i_sb;
 621         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 622         struct exfat_inode_info *ei = EXFAT_I(dir);
 623         struct exfat_dentry *ep, *ep2;
 624         struct exfat_entry_set_cache es;
 625         /* for optimized dir & entry to prevent long traverse of cluster chain */
 626         struct exfat_hint hint_opt;
 627
 628         if (qname->len == 0)
 629                 return -ENOENT;
 630
 631         /* check the validity of directory name in the given pathname */
 632         ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name);
 633         if (ret)
 634                 return ret;
 635
 636         /* check the validation of hint_stat and initialize it if required */
 637         if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) {
 638                 ei->hint_stat.clu = cdir.dir;
 639                 ei->hint_stat.eidx = 0;
 640                 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff);
 641                 ei->hint_femp.eidx = EXFAT_HINT_NONE;
 642         }
 643
 644         /* search the file name for directories */
 645         dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt);
 646         if (dentry < 0)
 647                 return dentry; /* -error value */
 648
 649         info->dir = cdir;
 650         info->entry = dentry;
 651         info->num_subdirs = 0;
 652
 653         /* adjust cdir to the optimized value */
 654         cdir.dir = hint_opt.clu;
 655         if (cdir.flags & ALLOC_NO_FAT_CHAIN)
 656                 cdir.size -= dentry / sbi->dentries_per_clu;
 657         dentry = hint_opt.eidx;
 658         if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES))
 659                 return -EIO;
 660         ep = exfat_get_dentry_cached(&es, ES_IDX_FILE);
 661         ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM);
 662
 663         info->type = exfat_get_entry_type(ep);
 664         info->attr = le16_to_cpu(ep->dentry.file.attr);
 665         info->size = le64_to_cpu(ep2->dentry.stream.valid_size);
 666         info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size);
 667         info->size = le64_to_cpu(ep2->dentry.stream.size);
 668         if (info->size == 0) {
 669                 info->flags = ALLOC_NO_FAT_CHAIN;
 670                 info->start_clu = EXFAT_EOF_CLUSTER;
 671         } else {
 672                 info->flags = ep2->dentry.stream.flags;
 673                 info->start_clu =
 674                         le32_to_cpu(ep2->dentry.stream.start_clu);
 675         }
 676
 677         exfat_get_entry_time(sbi, &info->crtime,
 678                              ep->dentry.file.create_tz,
 679                              ep->dentry.file.create_time,
 680                              ep->dentry.file.create_date,
 681                              ep->dentry.file.create_time_cs);
 682         exfat_get_entry_time(sbi, &info->mtime,
 683                              ep->dentry.file.modify_tz,
 684                              ep->dentry.file.modify_time,
 685                              ep->dentry.file.modify_date,
 686                              ep->dentry.file.modify_time_cs);
 687         exfat_get_entry_time(sbi, &info->atime,
 688                              ep->dentry.file.access_tz,
 689                              ep->dentry.file.access_time,
 690                              ep->dentry.file.access_date,
 691                              0);
 692         exfat_put_dentry_set(&es, false);
 693
 694         if (ei->start_clu == EXFAT_FREE_CLUSTER) {
 695                 exfat_fs_error(sb,
 696                                "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)",
 697                                i_size_read(dir), ei->dir.dir, ei->entry);
 698                 return -EIO;
 699         }
 700
 701         if (info->type == TYPE_DIR) {
 702                 exfat_chain_set(&cdir, info->start_clu,
 703                                 EXFAT_B_TO_CLU(info->size, sbi), info->flags);
 704                 count = exfat_count_dir_entries(sb, &cdir);
 705                 if (count < 0)
 706                         return -EIO;
 707
 708                 info->num_subdirs = count + EXFAT_MIN_SUBDIR;
 709         }
 710         return 0;
 711 }
 712
 713 static int exfat_d_anon_disconn(struct dentry *dentry)
 714 {
 715         return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
 716 }
 717
 718 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry,
 719                 unsigned int flags)
 720 {
 721         struct super_block *sb = dir->i_sb;
 722         struct inode *inode;
 723         struct dentry *alias;
 724         struct exfat_dir_entry info;
 725         int err;
 726         loff_t i_pos;
 727         mode_t i_mode;
 728
 729         mutex_lock(&EXFAT_SB(sb)->s_lock);
 730         err = exfat_find(dir, &dentry->d_name, &info);
 731         if (err) {
 732                 if (err == -ENOENT) {
 733                         inode = NULL;
 734                         goto out;
 735                 }
 736                 goto unlock;
 737         }
 738
 739         i_pos = exfat_make_i_pos(&info);
 740         inode = exfat_build_inode(sb, &info, i_pos);
 741         err = PTR_ERR_OR_ZERO(inode);
 742         if (err)
 743                 goto unlock;
 744
 745         i_mode = inode->i_mode;
 746         alias = d_find_alias(inode);
 747
 748         /*
 749          * Checking "alias->d_parent == dentry->d_parent" to make sure
 750          * FS is not corrupted (especially double linked dir).
 751          */
 752         if (alias && alias->d_parent == dentry->d_parent &&
 753                         !exfat_d_anon_disconn(alias)) {
 754
 755                 /*
 756                  * Unhashed alias is able to exist because of revalidate()
 757                  * called by lookup_fast. You can easily make this status
 758                  * by calling create and lookup concurrently
 759                  * In such case, we reuse an alias instead of new dentry
 760                  */
 761                 if (d_unhashed(alias)) {
 762                         WARN_ON(alias->d_name.hash_len !=
 763                                 dentry->d_name.hash_len);
 764                         exfat_info(sb, "rehashed a dentry(%p) in read lookup",
 765                                    alias);
 766                         d_drop(dentry);
 767                         d_rehash(alias);
 768                 } else if (!S_ISDIR(i_mode)) {
 769                         /*
 770                          * This inode has non anonymous-DCACHE_DISCONNECTED
 771                          * dentry. This means, the user did ->lookup() by an
 772                          * another name (longname vs 8.3 alias of it) in past.
 773                          *
 774                          * Switch to new one for reason of locality if possible.
 775                          */
 776                         d_move(alias, dentry);
 777                 }
 778                 iput(inode);
 779                 mutex_unlock(&EXFAT_SB(sb)->s_lock);
 780                 return alias;
 781         }
 782         dput(alias);
 783 out:
 784         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 785         if (!inode)
 786                 exfat_d_version_set(dentry, inode_query_iversion(dir));
 787
 788         return d_splice_alias(inode, dentry);
 789 unlock:
 790         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 791         return ERR_PTR(err);
 792 }
 793
 794 /* remove an entry, BUT don't truncate */
 795 static int exfat_unlink(struct inode *dir, struct dentry *dentry)
 796 {
 797         struct exfat_chain cdir;
 798         struct exfat_dentry *ep;
 799         struct super_block *sb = dir->i_sb;
 800         struct inode *inode = dentry->d_inode;
 801         struct exfat_inode_info *ei = EXFAT_I(inode);
 802         struct buffer_head *bh;
 803         int num_entries, entry, err = 0;
 804
 805         mutex_lock(&EXFAT_SB(sb)->s_lock);
 806         exfat_chain_dup(&cdir, &ei->dir);
 807         entry = ei->entry;
 808         if (ei->dir.dir == DIR_DELETED) {
 809                 exfat_err(sb, "abnormal access to deleted dentry");
 810                 err = -ENOENT;
 811                 goto unlock;
 812         }
 813
 814         ep = exfat_get_dentry(sb, &cdir, entry, &bh);
 815         if (!ep) {
 816                 err = -EIO;
 817                 goto unlock;
 818         }
 819         num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
 820         if (num_entries < 0) {
 821                 err = -EIO;
 822                 brelse(bh);
 823                 goto unlock;
 824         }
 825         num_entries++;
 826         brelse(bh);
 827
 828         exfat_set_volume_dirty(sb);
 829         /* update the directory entry */
 830         if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) {
 831                 err = -EIO;
 832                 goto unlock;
 833         }
 834
 835         /* This doesn't modify ei */
 836         ei->dir.dir = DIR_DELETED;
 837
 838         inode_inc_iversion(dir);
 839         simple_inode_init_ts(dir);
 840         exfat_truncate_inode_atime(dir);
 841         if (IS_DIRSYNC(dir))
 842                 exfat_sync_inode(dir);
 843         else
 844                 mark_inode_dirty(dir);
 845
 846         clear_nlink(inode);
 847         simple_inode_init_ts(inode);
 848         exfat_truncate_inode_atime(inode);
 849         exfat_unhash_inode(inode);
 850         exfat_d_version_set(dentry, inode_query_iversion(dir));
 851 unlock:
 852         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 853         return err;
 854 }
 855
 856 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 857                        struct dentry *dentry, umode_t mode)
 858 {
 859         struct super_block *sb = dir->i_sb;
 860         struct inode *inode;
 861         struct exfat_dir_entry info;
 862         struct exfat_chain cdir;
 863         loff_t i_pos;
 864         int err;
 865
 866         mutex_lock(&EXFAT_SB(sb)->s_lock);
 867         exfat_set_volume_dirty(sb);
 868         err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR,
 869                 &info);
 870         if (err)
 871                 goto unlock;
 872
 873         inode_inc_iversion(dir);
 874         inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 875         if (IS_DIRSYNC(dir))
 876                 exfat_sync_inode(dir);
 877         else
 878                 mark_inode_dirty(dir);
 879         inc_nlink(dir);
 880
 881         i_pos = exfat_make_i_pos(&info);
 882         inode = exfat_build_inode(sb, &info, i_pos);
 883         err = PTR_ERR_OR_ZERO(inode);
 884         if (err)
 885                 goto unlock;
 886
 887         inode_inc_iversion(inode);
 888         EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode);
 889         exfat_truncate_inode_atime(inode);
 890         /* timestamp is already written, so mark_inode_dirty() is unneeded. */
 891
 892         d_instantiate(dentry, inode);
 893
 894 unlock:
 895         mutex_unlock(&EXFAT_SB(sb)->s_lock);
 896         return err;
 897 }
 898
 899 static int exfat_check_dir_empty(struct super_block *sb,
 900                 struct exfat_chain *p_dir)
 901 {
 902         int i, dentries_per_clu;
 903         unsigned int type;
 904         struct exfat_chain clu;
 905         struct exfat_dentry *ep;
 906         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 907         struct buffer_head *bh;
 908
 909         dentries_per_clu = sbi->dentries_per_clu;
 910
 911         if (p_dir->dir == EXFAT_EOF_CLUSTER)
 912                 return 0;
 913
 914         exfat_chain_dup(&clu, p_dir);
 915
 916         while (clu.dir != EXFAT_EOF_CLUSTER) {
 917                 for (i = 0; i < dentries_per_clu; i++) {
 918                         ep = exfat_get_dentry(sb, &clu, i, &bh);
 919                         if (!ep)
 920                                 return -EIO;
 921                         type = exfat_get_entry_type(ep);
 922                         brelse(bh);
 923                         if (type == TYPE_UNUSED)
 924                                 return 0;
 925
 926                         if (type != TYPE_FILE && type != TYPE_DIR)
 927                                 continue;
 928
 929                         return -ENOTEMPTY;
 930                 }
 931
 932                 if (clu.flags == ALLOC_NO_FAT_CHAIN) {
 933                         if (--clu.size > 0)
 934                                 clu.dir++;
 935                         else
 936                                 clu.dir = EXFAT_EOF_CLUSTER;
 937                 } else {
 938                         if (exfat_get_next_cluster(sb, &(clu.dir)))
 939                                 return -EIO;
 940                 }
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int exfat_rmdir(struct inode *dir, struct dentry *dentry)
 947 {
 948         struct inode *inode = dentry->d_inode;
 949         struct exfat_dentry *ep;
 950         struct exfat_chain cdir, clu_to_free;
 951         struct super_block *sb = inode->i_sb;
 952         struct exfat_sb_info *sbi = EXFAT_SB(sb);
 953         struct exfat_inode_info *ei = EXFAT_I(inode);
 954         struct buffer_head *bh;
 955         int num_entries, entry, err;
 956
 957         mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock);
 958
 959         exfat_chain_dup(&cdir, &ei->dir);
 960         entry = ei->entry;
 961
 962         if (ei->dir.dir == DIR_DELETED) {
 963                 exfat_err(sb, "abnormal access to deleted dentry");
 964                 err = -ENOENT;
 965                 goto unlock;
 966         }
 967
 968         exfat_chain_set(&clu_to_free, ei->start_clu,
 969                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags);
 970
 971         err = exfat_check_dir_empty(sb, &clu_to_free);
 972         if (err) {
 973                 if (err == -EIO)
 974                         exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)",
 975                                   err);
 976                 goto unlock;
 977         }
 978
 979         ep = exfat_get_dentry(sb, &cdir, entry, &bh);
 980         if (!ep) {
 981                 err = -EIO;
 982                 goto unlock;
 983         }
 984
 985         num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep);
 986         if (num_entries < 0) {
 987                 err = -EIO;
 988                 brelse(bh);
 989                 goto unlock;
 990         }
 991         num_entries++;
 992         brelse(bh);
 993
 994         exfat_set_volume_dirty(sb);
 995         err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries);
 996         if (err) {
 997                 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err);
 998                 goto unlock;
 999         }
1000         ei->dir.dir = DIR_DELETED;
1001
1002         inode_inc_iversion(dir);
1003         simple_inode_init_ts(dir);
1004         exfat_truncate_inode_atime(dir);
1005         if (IS_DIRSYNC(dir))
1006                 exfat_sync_inode(dir);
1007         else
1008                 mark_inode_dirty(dir);
1009         drop_nlink(dir);
1010
1011         clear_nlink(inode);
1012         simple_inode_init_ts(inode);
1013         exfat_truncate_inode_atime(inode);
1014         exfat_unhash_inode(inode);
1015         exfat_d_version_set(dentry, inode_query_iversion(dir));
1016 unlock:
1017         mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock);
1018         return err;
1019 }
1020
1021 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
1022                 int oldentry, struct exfat_uni_name *p_uniname,
1023                 struct exfat_inode_info *ei)
1024 {
1025         int ret, num_old_entries, num_new_entries;
1026         struct exfat_dentry *epold, *epnew;
1027         struct super_block *sb = inode->i_sb;
1028         struct buffer_head *new_bh, *old_bh;
1029         int sync = IS_DIRSYNC(inode);
1030
1031         epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh);
1032         if (!epold)
1033                 return -EIO;
1034
1035         num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold);
1036         if (num_old_entries < 0)
1037                 return -EIO;
1038         num_old_entries++;
1039
1040         num_new_entries = exfat_calc_num_entries(p_uniname);
1041         if (num_new_entries < 0)
1042                 return num_new_entries;
1043
1044         if (num_old_entries < num_new_entries) {
1045                 int newentry;
1046
1047                 newentry =
1048                         exfat_find_empty_entry(inode, p_dir, num_new_entries);
1049                 if (newentry < 0)
1050                         return newentry; /* -EIO or -ENOSPC */
1051
1052                 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh);
1053                 if (!epnew)
1054                         return -EIO;
1055
1056                 *epnew = *epold;
1057                 if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1058                         epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1059                         ei->attr |= EXFAT_ATTR_ARCHIVE;
1060                 }
1061                 exfat_update_bh(new_bh, sync);
1062                 brelse(old_bh);
1063                 brelse(new_bh);
1064
1065                 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh);
1066                 if (!epold)
1067                         return -EIO;
1068                 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh);
1069                 if (!epnew) {
1070                         brelse(old_bh);
1071                         return -EIO;
1072                 }
1073
1074                 *epnew = *epold;
1075                 exfat_update_bh(new_bh, sync);
1076                 brelse(old_bh);
1077                 brelse(new_bh);
1078
1079                 ret = exfat_init_ext_entry(inode, p_dir, newentry,
1080                         num_new_entries, p_uniname);
1081                 if (ret)
1082                         return ret;
1083
1084                 exfat_remove_entries(inode, p_dir, oldentry, 0,
1085                         num_old_entries);
1086                 ei->dir = *p_dir;
1087                 ei->entry = newentry;
1088         } else {
1089                 if (exfat_get_entry_type(epold) == TYPE_FILE) {
1090                         epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1091                         ei->attr |= EXFAT_ATTR_ARCHIVE;
1092                 }
1093                 exfat_update_bh(old_bh, sync);
1094                 brelse(old_bh);
1095                 ret = exfat_init_ext_entry(inode, p_dir, oldentry,
1096                         num_new_entries, p_uniname);
1097                 if (ret)
1098                         return ret;
1099
1100                 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries,
1101                         num_old_entries);
1102         }
1103         return 0;
1104 }
1105
1106 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir,
1107                 int oldentry, struct exfat_chain *p_newdir,
1108                 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei)
1109 {
1110         int ret, newentry, num_new_entries, num_old_entries;
1111         struct exfat_dentry *epmov, *epnew;
1112         struct super_block *sb = inode->i_sb;
1113         struct buffer_head *mov_bh, *new_bh;
1114
1115         epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh);
1116         if (!epmov)
1117                 return -EIO;
1118
1119         num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry,
1120                 epmov);
1121         if (num_old_entries < 0)
1122                 return -EIO;
1123         num_old_entries++;
1124
1125         num_new_entries = exfat_calc_num_entries(p_uniname);
1126         if (num_new_entries < 0)
1127                 return num_new_entries;
1128
1129         newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries);
1130         if (newentry < 0)
1131                 return newentry; /* -EIO or -ENOSPC */
1132
1133         epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh);
1134         if (!epnew)
1135                 return -EIO;
1136
1137         *epnew = *epmov;
1138         if (exfat_get_entry_type(epnew) == TYPE_FILE) {
1139                 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE);
1140                 ei->attr |= EXFAT_ATTR_ARCHIVE;
1141         }
1142         exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1143         brelse(mov_bh);
1144         brelse(new_bh);
1145
1146         epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh);
1147         if (!epmov)
1148                 return -EIO;
1149         epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh);
1150         if (!epnew) {
1151                 brelse(mov_bh);
1152                 return -EIO;
1153         }
1154
1155         *epnew = *epmov;
1156         exfat_update_bh(new_bh, IS_DIRSYNC(inode));
1157         brelse(mov_bh);
1158         brelse(new_bh);
1159
1160         ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries,
1161                 p_uniname);
1162         if (ret)
1163                 return ret;
1164
1165         exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries);
1166
1167         exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size,
1168                 p_newdir->flags);
1169
1170         ei->entry = newentry;
1171         return 0;
1172 }
1173
1174 /* rename or move a old file into a new file */
1175 static int __exfat_rename(struct inode *old_parent_inode,
1176                 struct exfat_inode_info *ei, struct inode *new_parent_inode,
1177                 struct dentry *new_dentry)
1178 {
1179         int ret;
1180         int dentry;
1181         struct exfat_chain olddir, newdir;
1182         struct exfat_chain *p_dir = NULL;
1183         struct exfat_uni_name uni_name;
1184         struct exfat_dentry *ep;
1185         struct super_block *sb = old_parent_inode->i_sb;
1186         struct exfat_sb_info *sbi = EXFAT_SB(sb);
1187         const unsigned char *new_path = new_dentry->d_name.name;
1188         struct inode *new_inode = new_dentry->d_inode;
1189         int num_entries;
1190         struct exfat_inode_info *new_ei = NULL;
1191         unsigned int new_entry_type = TYPE_UNUSED;
1192         int new_entry = 0;
1193         struct buffer_head *new_bh = NULL;
1194
1195         /* check the validity of pointer parameters */
1196         if (new_path == NULL || strlen(new_path) == 0)
1197                 return -EINVAL;
1198
1199         if (ei->dir.dir == DIR_DELETED) {
1200                 exfat_err(sb, "abnormal access to deleted source dentry");
1201                 return -ENOENT;
1202         }
1203
1204         exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu,
1205                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi),
1206                 EXFAT_I(old_parent_inode)->flags);
1207         dentry = ei->entry;
1208
1209         /* check whether new dir is existing directory and empty */
1210         if (new_inode) {
1211                 ret = -EIO;
1212                 new_ei = EXFAT_I(new_inode);
1213
1214                 if (new_ei->dir.dir == DIR_DELETED) {
1215                         exfat_err(sb, "abnormal access to deleted target dentry");
1216                         goto out;
1217                 }
1218
1219                 p_dir = &(new_ei->dir);
1220                 new_entry = new_ei->entry;
1221                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1222                 if (!ep)
1223                         goto out;
1224
1225                 new_entry_type = exfat_get_entry_type(ep);
1226                 brelse(new_bh);
1227
1228                 /* if new_inode exists, update ei */
1229                 if (new_entry_type == TYPE_DIR) {
1230                         struct exfat_chain new_clu;
1231
1232                         new_clu.dir = new_ei->start_clu;
1233                         new_clu.size =
1234                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1235                                 sbi);
1236                         new_clu.flags = new_ei->flags;
1237
1238                         ret = exfat_check_dir_empty(sb, &new_clu);
1239                         if (ret)
1240                                 goto out;
1241                 }
1242         }
1243
1244         /* check the validity of directory name in the given new pathname */
1245         ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
1246                         &uni_name);
1247         if (ret)
1248                 goto out;
1249
1250         exfat_set_volume_dirty(sb);
1251
1252         if (olddir.dir == newdir.dir)
1253                 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
1254                                 &uni_name, ei);
1255         else
1256                 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
1257                                 &newdir, &uni_name, ei);
1258
1259         if (!ret && new_inode) {
1260                 /* delete entries of new_dir */
1261                 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh);
1262                 if (!ep) {
1263                         ret = -EIO;
1264                         goto del_out;
1265                 }
1266
1267                 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
1268                 if (num_entries < 0) {
1269                         ret = -EIO;
1270                         goto del_out;
1271                 }
1272                 brelse(new_bh);
1273
1274                 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
1275                                 num_entries + 1)) {
1276                         ret = -EIO;
1277                         goto del_out;
1278                 }
1279
1280                 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
1281                 if (new_entry_type == TYPE_DIR &&
1282                     new_ei->start_clu != EXFAT_EOF_CLUSTER) {
1283                         /* new_ei, new_clu_to_free */
1284                         struct exfat_chain new_clu_to_free;
1285
1286                         exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
1287                                 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
1288                                 sbi), new_ei->flags);
1289
1290                         if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
1291                                 /* just set I/O error only */
1292                                 ret = -EIO;
1293                         }
1294
1295                         i_size_write(new_inode, 0);
1296                         new_ei->valid_size = 0;
1297                         new_ei->start_clu = EXFAT_EOF_CLUSTER;
1298                         new_ei->flags = ALLOC_NO_FAT_CHAIN;
1299                 }
1300 del_out:
1301                 /* Update new_inode ei
1302                  * Prevent syncing removed new_inode
1303                  * (new_ei is already initialized above code ("if (new_inode)")
1304                  */
1305                 new_ei->dir.dir = DIR_DELETED;
1306         }
1307 out:
1308         return ret;
1309 }
1310
1311 static int exfat_rename(struct mnt_idmap *idmap,
1312                         struct inode *old_dir, struct dentry *old_dentry,
1313                         struct inode *new_dir, struct dentry *new_dentry,
1314                         unsigned int flags)
1315 {
1316         struct inode *old_inode, *new_inode;
1317         struct super_block *sb = old_dir->i_sb;
1318         loff_t i_pos;
1319         int err;
1320
1321         /*
1322          * The VFS already checks for existence, so for local filesystems
1323          * the RENAME_NOREPLACE implementation is equivalent to plain rename.
1324          * Don't support any other flags
1325          */
1326         if (flags & ~RENAME_NOREPLACE)
1327                 return -EINVAL;
1328
1329         mutex_lock(&EXFAT_SB(sb)->s_lock);
1330         old_inode = old_dentry->d_inode;
1331         new_inode = new_dentry->d_inode;
1332
1333         err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry);
1334         if (err)
1335                 goto unlock;
1336
1337         inode_inc_iversion(new_dir);
1338         simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1339         EXFAT_I(new_dir)->i_crtime = current_time(new_dir);
1340         exfat_truncate_inode_atime(new_dir);
1341         if (IS_DIRSYNC(new_dir))
1342                 exfat_sync_inode(new_dir);
1343         else
1344                 mark_inode_dirty(new_dir);
1345
1346         i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) |
1347                 (EXFAT_I(old_inode)->entry & 0xffffffff);
1348         exfat_unhash_inode(old_inode);
1349         exfat_hash_inode(old_inode, i_pos);
1350         if (IS_DIRSYNC(new_dir))
1351                 exfat_sync_inode(old_inode);
1352         else
1353                 mark_inode_dirty(old_inode);
1354
1355         if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
1356                 drop_nlink(old_dir);
1357                 if (!new_inode)
1358                         inc_nlink(new_dir);
1359         }
1360
1361         inode_inc_iversion(old_dir);
1362         if (IS_DIRSYNC(old_dir))
1363                 exfat_sync_inode(old_dir);
1364         else
1365                 mark_inode_dirty(old_dir);
1366
1367         if (new_inode) {
1368                 exfat_unhash_inode(new_inode);
1369
1370                 /* skip drop_nlink if new_inode already has been dropped */
1371                 if (new_inode->i_nlink) {
1372                         drop_nlink(new_inode);
1373                         if (S_ISDIR(new_inode->i_mode))
1374                                 drop_nlink(new_inode);
1375                 } else {
1376                         exfat_warn(sb, "abnormal access to an inode dropped");
1377                         WARN_ON(new_inode->i_nlink == 0);
1378                 }
1379                 EXFAT_I(new_inode)->i_crtime = current_time(new_inode);
1380         }
1381
1382 unlock:
1383         mutex_unlock(&EXFAT_SB(sb)->s_lock);
1384         return err;
1385 }
1386
1387 const struct inode_operations exfat_dir_inode_operations = {
1388         .create         = exfat_create,
1389         .lookup         = exfat_lookup,
1390         .unlink         = exfat_unlink,
1391         .mkdir          = exfat_mkdir,
1392         .rmdir          = exfat_rmdir,
1393         .rename         = exfat_rename,
1394         .setattr        = exfat_setattr,
1395         .getattr        = exfat_getattr,
1396 };