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