fs/exfat/namei.c

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