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 inode *dir, const struct qstr *name, 35 struct dentry *dentry, unsigned int flags) 36 { 37 if (flags & LOOKUP_RCU) 38 return -ECHILD; 39 40 /* 41 * This is not negative dentry. Always valid. 42 * 43 * Note, rename() to existing directory entry will have ->d_inode, and 44 * will use existing name which isn't specified name by user. 45 * 46 * We may be able to drop this positive dentry here. But dropping 47 * positive dentry isn't good idea. So it's unsupported like 48 * rename("filename", "FILENAME") for now. 49 */ 50 if (d_really_is_positive(dentry)) 51 return 1; 52 53 /* 54 * Drop the negative dentry, in order to make sure to use the case 55 * sensitive name which is specified by user if this is for creation. 56 */ 57 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 58 return 0; 59 60 return inode_eq_iversion(dir, exfat_d_version(dentry)); 61 } 62 63 /* returns the length of a struct qstr, ignoring trailing dots if necessary */ 64 static unsigned int exfat_striptail_len(unsigned int len, const char *name, 65 bool keep_last_dots) 66 { 67 if (!keep_last_dots) { 68 while (len && name[len - 1] == '.') 69 len--; 70 } 71 return len; 72 } 73 74 /* 75 * Compute the hash for the exfat name corresponding to the dentry. If the name 76 * is invalid, we leave the hash code unchanged so that the existing dentry can 77 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate. 78 */ 79 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) 80 { 81 struct super_block *sb = dentry->d_sb; 82 struct nls_table *t = EXFAT_SB(sb)->nls_io; 83 const unsigned char *name = qstr->name; 84 unsigned int len = exfat_striptail_len(qstr->len, qstr->name, 85 EXFAT_SB(sb)->options.keep_last_dots); 86 unsigned long hash = init_name_hash(dentry); 87 int i, charlen; 88 wchar_t c; 89 90 for (i = 0; i < len; i += charlen) { 91 charlen = t->char2uni(&name[i], len - i, &c); 92 if (charlen < 0) 93 return charlen; 94 hash = partial_name_hash(exfat_toupper(sb, c), hash); 95 } 96 97 qstr->hash = end_name_hash(hash); 98 return 0; 99 } 100 101 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len, 102 const char *str, const struct qstr *name) 103 { 104 struct super_block *sb = dentry->d_sb; 105 struct nls_table *t = EXFAT_SB(sb)->nls_io; 106 unsigned int alen = exfat_striptail_len(name->len, name->name, 107 EXFAT_SB(sb)->options.keep_last_dots); 108 unsigned int blen = exfat_striptail_len(len, str, 109 EXFAT_SB(sb)->options.keep_last_dots); 110 wchar_t c1, c2; 111 int charlen, i; 112 113 if (alen != blen) 114 return 1; 115 116 for (i = 0; i < len; i += charlen) { 117 charlen = t->char2uni(&name->name[i], alen - i, &c1); 118 if (charlen < 0) 119 return 1; 120 if (charlen != t->char2uni(&str[i], blen - i, &c2)) 121 return 1; 122 123 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2)) 124 return 1; 125 } 126 127 return 0; 128 } 129 130 const struct dentry_operations exfat_dentry_ops = { 131 .d_revalidate = exfat_d_revalidate, 132 .d_hash = exfat_d_hash, 133 .d_compare = exfat_d_cmp, 134 }; 135 136 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr) 137 { 138 struct super_block *sb = dentry->d_sb; 139 const unsigned char *name = qstr->name; 140 unsigned int len = exfat_striptail_len(qstr->len, qstr->name, 141 EXFAT_SB(sb)->options.keep_last_dots); 142 unsigned long hash = init_name_hash(dentry); 143 int i, charlen; 144 unicode_t u; 145 146 for (i = 0; i < len; i += charlen) { 147 charlen = utf8_to_utf32(&name[i], len - i, &u); 148 if (charlen < 0) 149 return charlen; 150 151 /* 152 * exfat_toupper() works only for code points up to the U+FFFF. 153 */ 154 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u, 155 hash); 156 } 157 158 qstr->hash = end_name_hash(hash); 159 return 0; 160 } 161 162 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len, 163 const char *str, const struct qstr *name) 164 { 165 struct super_block *sb = dentry->d_sb; 166 unsigned int alen = exfat_striptail_len(name->len, name->name, 167 EXFAT_SB(sb)->options.keep_last_dots); 168 unsigned int blen = exfat_striptail_len(len, str, 169 EXFAT_SB(sb)->options.keep_last_dots); 170 171 unicode_t u_a, u_b; 172 int charlen, i; 173 174 if (alen != blen) 175 return 1; 176 177 for (i = 0; i < alen; i += charlen) { 178 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a); 179 if (charlen < 0) 180 return 1; 181 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b)) 182 return 1; 183 184 if (u_a <= 0xFFFF && u_b <= 0xFFFF) { 185 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b)) 186 return 1; 187 } else { 188 if (u_a != u_b) 189 return 1; 190 } 191 } 192 193 return 0; 194 } 195 196 const struct dentry_operations exfat_utf8_dentry_ops = { 197 .d_revalidate = exfat_d_revalidate, 198 .d_hash = exfat_utf8_d_hash, 199 .d_compare = exfat_utf8_d_cmp, 200 }; 201 202 /* search EMPTY CONTINUOUS "num_entries" entries */ 203 static int exfat_search_empty_slot(struct super_block *sb, 204 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir, 205 int num_entries, struct exfat_entry_set_cache *es) 206 { 207 int i, dentry, ret; 208 int dentries_per_clu; 209 struct exfat_chain clu; 210 struct exfat_sb_info *sbi = EXFAT_SB(sb); 211 unsigned int total_entries = exfat_cluster_to_dentries(sbi, p_dir->size); 212 213 dentries_per_clu = sbi->dentries_per_clu; 214 215 if (hint_femp->eidx != EXFAT_HINT_NONE) { 216 dentry = hint_femp->eidx; 217 218 /* 219 * If hint_femp->count is enough, it is needed to check if 220 * there are actual empty entries. 221 * Otherwise, and if "dentry + hint_famp->count" is also equal 222 * to "p_dir->size * dentries_per_clu", it means ENOSPC. 223 */ 224 if (dentry + hint_femp->count == total_entries && 225 num_entries > hint_femp->count) 226 return -ENOSPC; 227 228 hint_femp->eidx = EXFAT_HINT_NONE; 229 exfat_chain_dup(&clu, &hint_femp->cur); 230 } else { 231 exfat_chain_dup(&clu, p_dir); 232 dentry = 0; 233 } 234 235 while (dentry + num_entries <= total_entries && 236 clu.dir != EXFAT_EOF_CLUSTER) { 237 i = dentry & (dentries_per_clu - 1); 238 239 ret = exfat_get_empty_dentry_set(es, sb, &clu, i, num_entries); 240 if (ret < 0) 241 return ret; 242 else if (ret == 0) 243 return dentry; 244 245 dentry += ret; 246 i += ret; 247 248 while (i >= dentries_per_clu) { 249 if (exfat_chain_advance(sb, &clu, 1)) 250 return -EIO; 251 252 i -= dentries_per_clu; 253 } 254 } 255 256 hint_femp->eidx = dentry; 257 hint_femp->count = 0; 258 if (dentry == total_entries || clu.dir == EXFAT_EOF_CLUSTER) 259 exfat_chain_set(&hint_femp->cur, EXFAT_EOF_CLUSTER, 0, 260 clu.flags); 261 else 262 hint_femp->cur = clu; 263 264 return -ENOSPC; 265 } 266 267 static int exfat_check_max_dentries(struct inode *inode) 268 { 269 if (exfat_bytes_to_dentries(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) { 270 /* 271 * exFAT spec allows a dir to grow up to 8388608(256MB) 272 * dentries 273 */ 274 return -ENOSPC; 275 } 276 return 0; 277 } 278 279 /* 280 * Find an empty directory entry set. 281 * 282 * If there isn't any empty slot, expand cluster chain. 283 * 284 * in: 285 * inode: inode of the parent directory 286 * num_entries: specifies how many dentries in the empty directory entry set 287 * 288 * out: 289 * p_dir: the cluster where the empty directory entry set is located 290 * es: The found empty directory entry set 291 * 292 * return: 293 * the directory entry index in p_dir is returned on succeeds 294 * -error code is returned on failure 295 */ 296 int exfat_find_empty_entry(struct inode *inode, 297 struct exfat_chain *p_dir, int num_entries, 298 struct exfat_entry_set_cache *es) 299 { 300 int dentry, ret; 301 unsigned int last_clu; 302 loff_t size = 0; 303 struct exfat_chain clu; 304 struct super_block *sb = inode->i_sb; 305 struct exfat_sb_info *sbi = EXFAT_SB(sb); 306 struct exfat_inode_info *ei = EXFAT_I(inode); 307 struct exfat_hint_femp hint_femp; 308 309 hint_femp.eidx = EXFAT_HINT_NONE; 310 311 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { 312 hint_femp = ei->hint_femp; 313 ei->hint_femp.eidx = EXFAT_HINT_NONE; 314 } 315 316 exfat_chain_set(p_dir, ei->start_clu, 317 exfat_bytes_to_cluster(sbi, i_size_read(inode)), 318 ei->flags); 319 320 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir, 321 num_entries, es)) < 0) { 322 if (dentry != -ENOSPC) 323 return dentry; 324 325 if (exfat_check_max_dentries(inode)) 326 return -ENOSPC; 327 328 /* 329 * Allocate new cluster to this directory 330 */ 331 if (ei->start_clu != EXFAT_EOF_CLUSTER) { 332 /* we trust p_dir->size regardless of FAT type */ 333 if (exfat_find_last_cluster(sb, p_dir, &last_clu)) 334 return -EIO; 335 336 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); 337 } else { 338 /* This directory is empty */ 339 exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0, 340 ALLOC_NO_FAT_CHAIN); 341 } 342 343 /* allocate a cluster */ 344 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode), false); 345 if (ret) 346 return ret; 347 348 if (exfat_zeroed_cluster(inode, clu.dir)) 349 return -EIO; 350 351 if (ei->start_clu == EXFAT_EOF_CLUSTER) { 352 ei->start_clu = clu.dir; 353 p_dir->dir = clu.dir; 354 hint_femp.eidx = 0; 355 } 356 357 /* append to the FAT chain */ 358 if (clu.flags != p_dir->flags) { 359 /* no-fat-chain bit is disabled, 360 * so fat-chain should be synced with alloc-bitmap 361 */ 362 if (exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size)) 363 return -EIO; 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.cur.dir == EXFAT_EOF_CLUSTER) 373 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); 374 375 hint_femp.count += sbi->dentries_per_clu; 376 377 hint_femp.cur.size++; 378 p_dir->size++; 379 size = exfat_cluster_to_bytes(sbi, p_dir->size); 380 381 /* directory inode should be updated in here */ 382 i_size_write(inode, size); 383 ei->valid_size += sbi->cluster_size; 384 ei->flags = p_dir->flags; 385 inode->i_blocks += sbi->cluster_size >> 9; 386 } 387 388 p_dir->dir = exfat_sector_to_cluster(sbi, es->bh[0]->b_blocknr); 389 p_dir->size -= dentry / sbi->dentries_per_clu; 390 391 return dentry & (sbi->dentries_per_clu - 1); 392 } 393 394 /* 395 * Name Resolution Functions : 396 * Zero if it was successful; otherwise nonzero. 397 */ 398 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, 399 struct exfat_uni_name *p_uniname, int lookup) 400 { 401 int namelen; 402 int lossy = NLS_NAME_NO_LOSSY; 403 struct super_block *sb = inode->i_sb; 404 int pathlen = strlen(path); 405 406 /* 407 * get the length of the pathname excluding 408 * trailing periods, if any. 409 */ 410 namelen = exfat_striptail_len(pathlen, path, false); 411 if (EXFAT_SB(sb)->options.keep_last_dots) { 412 /* 413 * Do not allow the creation of files with names 414 * ending with period(s). 415 */ 416 if (!lookup && (namelen < pathlen)) 417 return -EINVAL; 418 namelen = pathlen; 419 } 420 if (!namelen) 421 return -ENOENT; 422 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) 423 return -ENAMETOOLONG; 424 425 /* 426 * strip all leading spaces : 427 * "MS windows 7" supports leading spaces. 428 * So we should skip this preprocessing for compatibility. 429 */ 430 431 /* file name conversion : 432 * If lookup case, we allow bad-name for compatibility. 433 */ 434 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, 435 &lossy); 436 if (namelen < 0) 437 return namelen; /* return error value */ 438 439 if ((lossy && !lookup) || !namelen) 440 return -EINVAL; 441 442 return 0; 443 } 444 445 static inline int exfat_resolve_path(struct inode *inode, 446 const unsigned char *path, struct exfat_uni_name *uni) 447 { 448 return __exfat_resolve_path(inode, path, uni, 0); 449 } 450 451 static inline int exfat_resolve_path_for_lookup(struct inode *inode, 452 const unsigned char *path, struct exfat_uni_name *uni) 453 { 454 return __exfat_resolve_path(inode, path, uni, 1); 455 } 456 457 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) 458 { 459 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); 460 } 461 462 static int exfat_add_entry(struct inode *inode, const char *path, 463 unsigned int type, struct exfat_dir_entry *info) 464 { 465 int ret, dentry, num_entries; 466 struct super_block *sb = inode->i_sb; 467 struct exfat_sb_info *sbi = EXFAT_SB(sb); 468 struct exfat_uni_name uniname; 469 struct exfat_chain clu; 470 struct timespec64 ts = current_time(inode); 471 struct exfat_entry_set_cache es; 472 int clu_size = 0; 473 unsigned int start_clu = EXFAT_FREE_CLUSTER; 474 bool dir_allocated = false; 475 476 ret = exfat_resolve_path(inode, path, &uniname); 477 if (ret) 478 goto out; 479 480 num_entries = exfat_calc_num_entries(&uniname); 481 if (num_entries < 0) { 482 ret = num_entries; 483 goto out; 484 } 485 486 /* exfat_find_empty_entry must be called before alloc_cluster() */ 487 dentry = exfat_find_empty_entry(inode, &info->dir, num_entries, &es); 488 if (dentry < 0) { 489 ret = dentry; /* -EIO or -ENOSPC */ 490 goto out; 491 } 492 493 if (type == TYPE_DIR && !sbi->options.zero_size_dir) { 494 ret = exfat_alloc_new_dir(inode, &clu); 495 if (ret) { 496 exfat_put_dentry_set(&es, false); 497 goto out; 498 } 499 start_clu = clu.dir; 500 clu_size = sbi->cluster_size; 501 dir_allocated = true; 502 } 503 504 /* update the directory entry */ 505 /* fill the dos name directory entry information of the created file. 506 * the first cluster is not determined yet. (0) 507 */ 508 exfat_init_dir_entry(&es, type, start_clu, clu_size, &ts); 509 exfat_init_ext_entry(&es, num_entries, &uniname, NULL, 0); 510 511 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(inode)); 512 if (ret) { 513 int cleanup_ret; 514 515 cleanup_ret = exfat_get_dentry_set(&es, sb, &info->dir, 516 dentry, ES_ALL_ENTRIES); 517 if (!cleanup_ret) { 518 exfat_remove_entries(inode, &es, ES_IDX_FILE, false); 519 cleanup_ret = exfat_put_dentry_set(&es, 520 IS_DIRSYNC(inode)); 521 } 522 523 if (!cleanup_ret && dir_allocated) 524 exfat_free_cluster(inode, &clu); 525 goto out; 526 } 527 528 info->entry = dentry; 529 info->flags = ALLOC_NO_FAT_CHAIN; 530 info->type = type; 531 532 if (type == TYPE_FILE) { 533 info->attr = EXFAT_ATTR_ARCHIVE; 534 info->start_clu = EXFAT_EOF_CLUSTER; 535 info->size = 0; 536 info->num_subdirs = 0; 537 } else { 538 info->attr = EXFAT_ATTR_SUBDIR; 539 if (sbi->options.zero_size_dir) 540 info->start_clu = EXFAT_EOF_CLUSTER; 541 else 542 info->start_clu = start_clu; 543 info->size = clu_size; 544 info->num_subdirs = EXFAT_MIN_SUBDIR; 545 } 546 info->valid_size = info->size; 547 548 memset(&info->crtime, 0, sizeof(info->crtime)); 549 memset(&info->mtime, 0, sizeof(info->mtime)); 550 memset(&info->atime, 0, sizeof(info->atime)); 551 out: 552 return ret; 553 } 554 555 static int exfat_create(const struct mnt_idmap *idmap, struct inode *dir, 556 struct dentry *dentry, umode_t mode) 557 { 558 struct super_block *sb = dir->i_sb; 559 struct inode *inode; 560 struct exfat_dir_entry info; 561 loff_t i_pos; 562 int err; 563 loff_t size = i_size_read(dir); 564 565 if (unlikely(exfat_forced_shutdown(sb))) 566 return -EIO; 567 568 mutex_lock(&EXFAT_SB(sb)->s_lock); 569 exfat_set_volume_dirty(sb); 570 err = exfat_add_entry(dir, dentry->d_name.name, TYPE_FILE, &info); 571 if (err) 572 goto unlock; 573 574 inode_inc_iversion(dir); 575 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 576 if (IS_DIRSYNC(dir) && size != i_size_read(dir)) 577 exfat_sync_inode(dir); 578 else 579 mark_inode_dirty(dir); 580 581 i_pos = exfat_make_i_pos(&info); 582 inode = exfat_build_inode(sb, &info, i_pos); 583 err = PTR_ERR_OR_ZERO(inode); 584 if (err) 585 goto unlock; 586 587 inode_inc_iversion(inode); 588 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 589 exfat_truncate_inode_atime(inode); 590 591 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 592 593 d_instantiate(dentry, inode); 594 unlock: 595 mutex_unlock(&EXFAT_SB(sb)->s_lock); 596 return err; 597 } 598 599 /* lookup a file */ 600 static int exfat_find(struct inode *dir, const struct qstr *qname, 601 struct exfat_dir_entry *info) 602 { 603 int ret, dentry, count; 604 struct exfat_chain cdir; 605 struct exfat_uni_name uni_name; 606 struct super_block *sb = dir->i_sb; 607 struct exfat_sb_info *sbi = EXFAT_SB(sb); 608 struct exfat_inode_info *ei = EXFAT_I(dir); 609 struct exfat_dentry *ep, *ep2; 610 struct exfat_entry_set_cache es; 611 /* for optimized dir & entry to prevent long traverse of cluster chain */ 612 struct exfat_hint hint_opt; 613 614 if (qname->len == 0) 615 return -ENOENT; 616 617 /* check the validity of directory name in the given pathname */ 618 ret = exfat_resolve_path_for_lookup(dir, qname->name, &uni_name); 619 if (ret) 620 return ret; 621 622 exfat_chain_set(&cdir, ei->start_clu, 623 exfat_bytes_to_cluster(sbi, i_size_read(dir)), ei->flags); 624 625 /* check the validation of hint_stat and initialize it if required */ 626 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 627 ei->hint_stat.clu = cdir.dir; 628 ei->hint_stat.eidx = 0; 629 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 630 ei->hint_femp.eidx = EXFAT_HINT_NONE; 631 } 632 633 /* search the file name for directories */ 634 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt); 635 if (dentry < 0) 636 return dentry; /* -error value */ 637 638 /* adjust cdir to the optimized value */ 639 cdir.dir = hint_opt.clu; 640 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 641 cdir.size -= dentry / sbi->dentries_per_clu; 642 dentry = hint_opt.eidx; 643 644 info->dir = cdir; 645 info->entry = dentry; 646 info->num_subdirs = 0; 647 648 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES)) 649 return -EIO; 650 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE); 651 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM); 652 653 info->type = exfat_get_entry_type(ep); 654 info->attr = le16_to_cpu(ep->dentry.file.attr); 655 info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size); 656 info->size = le64_to_cpu(ep2->dentry.stream.size); 657 658 info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu); 659 if (!is_valid_cluster(sbi, info->start_clu) && info->size) { 660 exfat_warn(sb, "start_clu is invalid cluster(0x%x)", 661 info->start_clu); 662 info->size = 0; 663 info->valid_size = 0; 664 } 665 666 if (info->valid_size > info->size) { 667 exfat_warn(sb, "valid_size(%lld) is greater than size(%lld)", 668 info->valid_size, info->size); 669 info->valid_size = info->size; 670 } 671 672 if (info->size == 0) { 673 info->flags = ALLOC_NO_FAT_CHAIN; 674 info->start_clu = EXFAT_EOF_CLUSTER; 675 } else 676 info->flags = ep2->dentry.stream.flags; 677 678 exfat_get_entry_time(sbi, &info->crtime, 679 ep->dentry.file.create_tz, 680 ep->dentry.file.create_time, 681 ep->dentry.file.create_date, 682 ep->dentry.file.create_time_cs); 683 exfat_get_entry_time(sbi, &info->mtime, 684 ep->dentry.file.modify_tz, 685 ep->dentry.file.modify_time, 686 ep->dentry.file.modify_date, 687 ep->dentry.file.modify_time_cs); 688 exfat_get_entry_time(sbi, &info->atime, 689 ep->dentry.file.access_tz, 690 ep->dentry.file.access_time, 691 ep->dentry.file.access_date, 692 0); 693 exfat_put_dentry_set(&es, false); 694 695 if (info->valid_size < 0) { 696 exfat_fs_error(sb, "data valid size is invalid(%lld)", info->valid_size); 697 return -EIO; 698 } 699 700 if (unlikely(exfat_bytes_to_cluster_round_up(sbi, info->size) > sbi->used_clusters)) { 701 exfat_fs_error(sb, "data size is invalid(%lld)", info->size); 702 return -EIO; 703 } 704 705 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 706 exfat_fs_error(sb, 707 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 708 i_size_read(dir), ei->dir.dir, ei->entry); 709 return -EIO; 710 } 711 712 if (info->type == TYPE_DIR) { 713 exfat_chain_set(&cdir, info->start_clu, 714 exfat_bytes_to_cluster(sbi, info->size), 715 info->flags); 716 count = exfat_count_dir_entries(sb, &cdir); 717 if (count < 0) 718 return -EIO; 719 720 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 721 } 722 return 0; 723 } 724 725 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 726 unsigned int flags) 727 { 728 struct super_block *sb = dir->i_sb; 729 struct inode *inode = NULL; 730 struct dentry *alias; 731 struct exfat_dir_entry info; 732 int err; 733 loff_t i_pos; 734 735 mutex_lock(&EXFAT_SB(sb)->s_lock); 736 err = exfat_find(dir, &dentry->d_name, &info); 737 if (err) { 738 if (unlikely(err != -ENOENT)) 739 inode = ERR_PTR(err); 740 goto out; 741 } 742 743 i_pos = exfat_make_i_pos(&info); 744 inode = exfat_build_inode(sb, &info, i_pos); 745 if (IS_ERR(inode) || S_ISDIR(inode->i_mode)) 746 goto out; 747 748 alias = d_find_alias(inode); 749 750 /* 751 * Checking "alias->d_parent == dentry->d_parent" to make sure 752 * FS is not corrupted (especially double linked dir). 753 */ 754 if (alias && alias->d_parent == dentry->d_parent) { 755 /* 756 * This inode has a hashed alias dentry with different 757 * name. This means, the user did ->lookup() by an 758 * another name (longname vs 8.3 alias of it) in past. 759 * 760 * Switch to new one for reason of locality if possible. 761 */ 762 d_move(alias, dentry); 763 iput(inode); 764 mutex_unlock(&EXFAT_SB(sb)->s_lock); 765 return alias; 766 } 767 dput(alias); 768 out: 769 mutex_unlock(&EXFAT_SB(sb)->s_lock); 770 if (!inode) 771 exfat_d_version_set(dentry, inode_query_iversion(dir)); 772 773 return d_splice_alias(inode, dentry); 774 } 775 776 /* remove an entry, BUT don't truncate */ 777 static int exfat_unlink(struct inode *dir, struct dentry *dentry) 778 { 779 struct super_block *sb = dir->i_sb; 780 struct inode *inode = dentry->d_inode; 781 struct exfat_inode_info *ei = EXFAT_I(inode); 782 struct exfat_entry_set_cache es; 783 int err = 0; 784 785 if (unlikely(exfat_forced_shutdown(sb))) 786 return -EIO; 787 788 mutex_lock(&EXFAT_SB(sb)->s_lock); 789 if (ei->dir.dir == DIR_DELETED) { 790 exfat_err(sb, "abnormal access to deleted dentry"); 791 err = -ENOENT; 792 goto unlock; 793 } 794 795 err = exfat_get_dentry_set_by_ei(&es, sb, ei); 796 if (err) { 797 err = -EIO; 798 goto unlock; 799 } 800 801 exfat_set_volume_dirty(sb); 802 803 /* update the directory entry */ 804 exfat_remove_entries(inode, &es, ES_IDX_FILE, true); 805 806 err = exfat_put_dentry_set(&es, IS_DIRSYNC(inode)); 807 if (err) 808 goto unlock; 809 810 /* This doesn't modify ei */ 811 ei->dir.dir = DIR_DELETED; 812 813 inode_inc_iversion(dir); 814 simple_inode_init_ts(dir); 815 exfat_truncate_inode_atime(dir); 816 mark_inode_dirty(dir); 817 818 clear_nlink(inode); 819 simple_inode_init_ts(inode); 820 exfat_truncate_inode_atime(inode); 821 exfat_unhash_inode(inode); 822 exfat_d_version_set(dentry, inode_query_iversion(dir)); 823 unlock: 824 mutex_unlock(&EXFAT_SB(sb)->s_lock); 825 return err; 826 } 827 828 static struct dentry *exfat_mkdir(const struct mnt_idmap *idmap, struct inode *dir, 829 struct dentry *dentry, umode_t mode) 830 { 831 struct super_block *sb = dir->i_sb; 832 struct inode *inode; 833 struct exfat_dir_entry info; 834 loff_t i_pos; 835 int err; 836 loff_t size = i_size_read(dir); 837 838 if (unlikely(exfat_forced_shutdown(sb))) 839 return ERR_PTR(-EIO); 840 841 mutex_lock(&EXFAT_SB(sb)->s_lock); 842 exfat_set_volume_dirty(sb); 843 err = exfat_add_entry(dir, dentry->d_name.name, TYPE_DIR, &info); 844 if (err) 845 goto unlock; 846 847 inode_inc_iversion(dir); 848 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 849 if (IS_DIRSYNC(dir) && size != i_size_read(dir)) 850 exfat_sync_inode(dir); 851 else 852 mark_inode_dirty(dir); 853 inc_nlink(dir); 854 855 i_pos = exfat_make_i_pos(&info); 856 inode = exfat_build_inode(sb, &info, i_pos); 857 if (IS_ERR(inode)) { 858 err = PTR_ERR(inode); 859 goto unlock; 860 } 861 862 inode_inc_iversion(inode); 863 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 864 exfat_truncate_inode_atime(inode); 865 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 866 867 d_instantiate(dentry, inode); 868 869 unlock: 870 mutex_unlock(&EXFAT_SB(sb)->s_lock); 871 return err ? ERR_PTR(err) : NULL; 872 } 873 874 static int exfat_check_dir_empty(struct super_block *sb, 875 struct exfat_chain *p_dir) 876 { 877 int i, dentries_per_clu; 878 unsigned int type; 879 unsigned int clu_count = 0; 880 struct exfat_chain clu; 881 struct exfat_dentry *ep; 882 struct exfat_sb_info *sbi = EXFAT_SB(sb); 883 struct buffer_head *bh; 884 885 dentries_per_clu = sbi->dentries_per_clu; 886 887 if (p_dir->dir == EXFAT_EOF_CLUSTER) 888 return 0; 889 890 exfat_chain_dup(&clu, p_dir); 891 892 while (clu.dir != EXFAT_EOF_CLUSTER) { 893 for (i = 0; i < dentries_per_clu; i++) { 894 ep = exfat_get_dentry(sb, &clu, i, &bh); 895 if (!ep) 896 return -EIO; 897 type = exfat_get_entry_type(ep); 898 brelse(bh); 899 if (type == TYPE_UNUSED) 900 return 0; 901 902 if (type != TYPE_FILE && type != TYPE_DIR) 903 continue; 904 905 return -ENOTEMPTY; 906 } 907 908 if (exfat_chain_advance(sb, &clu, 1)) 909 return -EIO; 910 911 /* break if the cluster chain includes a loop */ 912 if (unlikely(++clu_count > EXFAT_DATA_CLUSTER_COUNT(sbi))) 913 break; 914 } 915 916 return 0; 917 } 918 919 static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 920 { 921 struct inode *inode = dentry->d_inode; 922 struct exfat_chain clu_to_free; 923 struct super_block *sb = inode->i_sb; 924 struct exfat_sb_info *sbi = EXFAT_SB(sb); 925 struct exfat_inode_info *ei = EXFAT_I(inode); 926 struct exfat_entry_set_cache es; 927 int err; 928 929 if (unlikely(exfat_forced_shutdown(sb))) 930 return -EIO; 931 932 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 933 934 if (ei->dir.dir == DIR_DELETED) { 935 exfat_err(sb, "abnormal access to deleted dentry"); 936 err = -ENOENT; 937 goto unlock; 938 } 939 940 exfat_chain_set(&clu_to_free, ei->start_clu, 941 exfat_bytes_to_cluster_round_up(sbi, i_size_read(inode)), ei->flags); 942 943 err = exfat_check_dir_empty(sb, &clu_to_free); 944 if (err) { 945 if (err == -EIO) 946 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 947 err); 948 goto unlock; 949 } 950 951 err = exfat_get_dentry_set_by_ei(&es, sb, ei); 952 if (err) { 953 err = -EIO; 954 goto unlock; 955 } 956 957 exfat_set_volume_dirty(sb); 958 959 exfat_remove_entries(inode, &es, ES_IDX_FILE, true); 960 961 err = exfat_put_dentry_set(&es, IS_DIRSYNC(dir)); 962 if (err) 963 goto unlock; 964 965 ei->dir.dir = DIR_DELETED; 966 967 inode_inc_iversion(dir); 968 simple_inode_init_ts(dir); 969 exfat_truncate_inode_atime(dir); 970 if (IS_DIRSYNC(dir)) 971 exfat_sync_inode(dir); 972 else 973 mark_inode_dirty(dir); 974 drop_nlink(dir); 975 976 clear_nlink(inode); 977 simple_inode_init_ts(inode); 978 exfat_truncate_inode_atime(inode); 979 exfat_unhash_inode(inode); 980 exfat_d_version_set(dentry, inode_query_iversion(dir)); 981 unlock: 982 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 983 return err; 984 } 985 986 /* 987 * Count benign secondary entries beyond the filename entries. 988 * Returns the count, or -EIO if the entry set is inconsistent. 989 */ 990 static int exfat_count_extra_entries(struct exfat_entry_set_cache *es) 991 { 992 struct exfat_dentry *stream; 993 unsigned int name_entries; 994 int extra; 995 996 stream = exfat_get_dentry_cached(es, ES_IDX_STREAM); 997 name_entries = EXFAT_FILENAME_ENTRY_NUM(stream->dentry.stream.name_len); 998 extra = es->num_entries - (ES_IDX_FIRST_FILENAME + name_entries); 999 1000 return extra >= 0 ? extra : -EIO; 1001 } 1002 1003 static int exfat_rename_file(struct inode *parent_inode, 1004 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1005 { 1006 int ret, num_new_entries; 1007 struct exfat_dentry *epold, *epnew; 1008 struct super_block *sb = parent_inode->i_sb; 1009 struct exfat_entry_set_cache old_es, new_es; 1010 int sync = IS_DIRSYNC(parent_inode); 1011 unsigned int num_extra_entries, num_total_entries; 1012 1013 if (unlikely(exfat_forced_shutdown(sb))) 1014 return -EIO; 1015 1016 num_new_entries = exfat_calc_num_entries(p_uniname); 1017 if (num_new_entries < 0) 1018 return num_new_entries; 1019 1020 ret = exfat_get_dentry_set_by_ei(&old_es, sb, ei); 1021 if (ret) 1022 return -EIO; 1023 1024 epold = exfat_get_dentry_cached(&old_es, ES_IDX_FILE); 1025 1026 ret = exfat_count_extra_entries(&old_es); 1027 if (ret < 0) 1028 goto put_old_es; 1029 num_extra_entries = ret; 1030 num_total_entries = num_new_entries + num_extra_entries; 1031 1032 if (old_es.num_entries < num_total_entries) { 1033 int newentry; 1034 struct exfat_chain dir; 1035 1036 newentry = exfat_find_empty_entry(parent_inode, &dir, 1037 num_total_entries, &new_es); 1038 if (newentry < 0) { 1039 ret = newentry; /* -EIO or -ENOSPC */ 1040 goto put_old_es; 1041 } 1042 1043 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE); 1044 *epnew = *epold; 1045 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1046 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1047 ei->attr |= EXFAT_ATTR_ARCHIVE; 1048 } 1049 1050 epold = exfat_get_dentry_cached(&old_es, ES_IDX_STREAM); 1051 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM); 1052 *epnew = *epold; 1053 1054 exfat_init_ext_entry(&new_es, num_new_entries, p_uniname, 1055 &old_es, num_extra_entries); 1056 1057 ret = exfat_put_dentry_set(&new_es, sync); 1058 if (ret) { 1059 /* Best-effort delete to avoid duplicate entries */ 1060 if (!exfat_get_dentry_set(&new_es, sb, 1061 &dir, newentry, 1062 ES_ALL_ENTRIES)) { 1063 exfat_remove_entries(parent_inode, &new_es, 1064 ES_IDX_FILE, false); 1065 exfat_put_dentry_set(&new_es, false); 1066 } 1067 goto put_old_es; 1068 } 1069 1070 exfat_remove_entries(parent_inode, &old_es, ES_IDX_FILE, false); 1071 ei->dir = dir; 1072 ei->entry = newentry; 1073 } else { 1074 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1075 epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1076 ei->attr |= EXFAT_ATTR_ARCHIVE; 1077 } 1078 1079 exfat_init_ext_entry(&old_es, num_new_entries, p_uniname, 1080 &old_es, num_extra_entries); 1081 } 1082 return exfat_put_dentry_set(&old_es, sync); 1083 1084 put_old_es: 1085 exfat_put_dentry_set(&old_es, false); 1086 return ret; 1087 } 1088 1089 static int exfat_move_file(struct inode *parent_inode, 1090 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1091 { 1092 int ret, newentry, num_new_entries; 1093 struct exfat_dentry *epmov, *epnew; 1094 struct exfat_entry_set_cache mov_es, new_es; 1095 struct exfat_chain newdir; 1096 unsigned int num_extra_entries, num_total_entries; 1097 1098 num_new_entries = exfat_calc_num_entries(p_uniname); 1099 if (num_new_entries < 0) 1100 return num_new_entries; 1101 1102 ret = exfat_get_dentry_set_by_ei(&mov_es, parent_inode->i_sb, ei); 1103 if (ret) 1104 return -EIO; 1105 1106 ret = exfat_count_extra_entries(&mov_es); 1107 if (ret < 0) 1108 goto put_mov_es; 1109 num_extra_entries = ret; 1110 num_total_entries = num_new_entries + num_extra_entries; 1111 1112 newentry = exfat_find_empty_entry(parent_inode, &newdir, 1113 num_total_entries, &new_es); 1114 if (newentry < 0) { 1115 ret = newentry; /* -EIO or -ENOSPC */ 1116 goto put_mov_es; 1117 } 1118 1119 epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_FILE); 1120 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_FILE); 1121 *epnew = *epmov; 1122 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1123 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1124 ei->attr |= EXFAT_ATTR_ARCHIVE; 1125 } 1126 1127 epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_STREAM); 1128 epnew = exfat_get_dentry_cached(&new_es, ES_IDX_STREAM); 1129 *epnew = *epmov; 1130 1131 exfat_init_ext_entry(&new_es, num_new_entries, p_uniname, 1132 &mov_es, num_extra_entries); 1133 1134 ret = exfat_put_dentry_set(&new_es, IS_DIRSYNC(parent_inode)); 1135 if (ret) { 1136 /* Best-effort delete to avoid duplicate entries */ 1137 if (!exfat_get_dentry_set(&new_es, parent_inode->i_sb, 1138 &newdir, newentry, 1139 ES_ALL_ENTRIES)) { 1140 exfat_remove_entries(parent_inode, &new_es, 1141 ES_IDX_FILE, false); 1142 exfat_put_dentry_set(&new_es, false); 1143 } 1144 goto put_mov_es; 1145 } 1146 1147 exfat_remove_entries(parent_inode, &mov_es, ES_IDX_FILE, false); 1148 1149 ei->dir = newdir; 1150 ei->entry = newentry; 1151 1152 return exfat_put_dentry_set(&mov_es, IS_DIRSYNC(parent_inode)); 1153 1154 put_mov_es: 1155 exfat_put_dentry_set(&mov_es, false); 1156 return ret; 1157 } 1158 1159 /* rename or move a old file into a new file */ 1160 static int __exfat_rename(struct inode *old_parent_inode, 1161 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1162 struct dentry *new_dentry) 1163 { 1164 int ret; 1165 struct exfat_uni_name uni_name; 1166 struct super_block *sb = old_parent_inode->i_sb; 1167 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1168 const unsigned char *new_path = new_dentry->d_name.name; 1169 struct inode *new_inode = new_dentry->d_inode; 1170 struct exfat_inode_info *new_ei = 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 /* check whether new dir is existing directory and empty */ 1182 if (new_inode) { 1183 ret = -EIO; 1184 new_ei = EXFAT_I(new_inode); 1185 1186 if (new_ei->dir.dir == DIR_DELETED) { 1187 exfat_err(sb, "abnormal access to deleted target dentry"); 1188 goto out; 1189 } 1190 1191 /* if new_inode exists, update ei */ 1192 if (S_ISDIR(new_inode->i_mode)) { 1193 struct exfat_chain new_clu; 1194 1195 new_clu.dir = new_ei->start_clu; 1196 new_clu.size = 1197 exfat_bytes_to_cluster_round_up(sbi, 1198 i_size_read(new_inode)); 1199 new_clu.flags = new_ei->flags; 1200 1201 ret = exfat_check_dir_empty(sb, &new_clu); 1202 if (ret) 1203 goto out; 1204 } 1205 } 1206 1207 /* check the validity of directory name in the given new pathname */ 1208 ret = exfat_resolve_path(new_parent_inode, new_path, &uni_name); 1209 if (ret) 1210 goto out; 1211 1212 exfat_set_volume_dirty(sb); 1213 1214 if (new_parent_inode == old_parent_inode) 1215 ret = exfat_rename_file(new_parent_inode, &uni_name, ei); 1216 else 1217 ret = exfat_move_file(new_parent_inode, &uni_name, ei); 1218 1219 if (!ret && new_inode) { 1220 struct exfat_entry_set_cache es; 1221 1222 /* delete entries of new_dir */ 1223 ret = exfat_get_dentry_set_by_ei(&es, sb, new_ei); 1224 if (ret) { 1225 ret = -EIO; 1226 goto del_out; 1227 } 1228 1229 exfat_remove_entries(new_inode, &es, ES_IDX_FILE, true); 1230 1231 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(new_inode)); 1232 if (ret) 1233 goto del_out; 1234 1235 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1236 if (S_ISDIR(new_inode->i_mode) && 1237 new_ei->start_clu != EXFAT_EOF_CLUSTER) { 1238 /* new_ei, new_clu_to_free */ 1239 struct exfat_chain new_clu_to_free; 1240 1241 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1242 exfat_bytes_to_cluster_round_up(sbi, i_size_read(new_inode)), 1243 new_ei->flags); 1244 1245 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1246 /* just set I/O error only */ 1247 ret = -EIO; 1248 } 1249 1250 i_size_write(new_inode, 0); 1251 new_ei->valid_size = 0; 1252 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1253 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1254 } 1255 del_out: 1256 /* Update new_inode ei 1257 * Prevent syncing removed new_inode 1258 * (new_ei is already initialized above code ("if (new_inode)") 1259 */ 1260 new_ei->dir.dir = DIR_DELETED; 1261 } 1262 out: 1263 return ret; 1264 } 1265 1266 static int exfat_rename(const struct mnt_idmap *idmap, 1267 struct inode *old_dir, struct dentry *old_dentry, 1268 struct inode *new_dir, struct dentry *new_dentry, 1269 unsigned int flags) 1270 { 1271 struct inode *old_inode, *new_inode; 1272 struct super_block *sb = old_dir->i_sb; 1273 loff_t i_pos; 1274 int err; 1275 loff_t size = i_size_read(new_dir); 1276 1277 /* 1278 * The VFS already checks for existence, so for local filesystems 1279 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1280 * Don't support any other flags 1281 */ 1282 if (flags & ~RENAME_NOREPLACE) 1283 return -EINVAL; 1284 1285 mutex_lock(&EXFAT_SB(sb)->s_lock); 1286 old_inode = old_dentry->d_inode; 1287 new_inode = new_dentry->d_inode; 1288 1289 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1290 if (err) 1291 goto unlock; 1292 1293 inode_inc_iversion(new_dir); 1294 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); 1295 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1296 exfat_truncate_inode_atime(new_dir); 1297 if (IS_DIRSYNC(new_dir) && size != i_size_read(new_dir)) 1298 exfat_sync_inode(new_dir); 1299 else 1300 mark_inode_dirty(new_dir); 1301 1302 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1303 (EXFAT_I(old_inode)->entry & 0xffffffff); 1304 exfat_unhash_inode(old_inode); 1305 exfat_hash_inode(old_inode, i_pos); 1306 if (IS_DIRSYNC(new_dir)) 1307 exfat_sync_inode(old_inode); 1308 else 1309 mark_inode_dirty(old_inode); 1310 1311 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1312 drop_nlink(old_dir); 1313 if (!new_inode) 1314 inc_nlink(new_dir); 1315 } 1316 1317 inode_inc_iversion(old_dir); 1318 if (new_dir != old_dir) 1319 mark_inode_dirty(old_dir); 1320 1321 if (new_inode) { 1322 exfat_unhash_inode(new_inode); 1323 1324 /* skip drop_nlink if new_inode already has been dropped */ 1325 if (new_inode->i_nlink) { 1326 drop_nlink(new_inode); 1327 if (S_ISDIR(new_inode->i_mode)) 1328 drop_nlink(new_inode); 1329 } else { 1330 exfat_warn(sb, "abnormal access to an inode dropped"); 1331 WARN_ON(new_inode->i_nlink == 0); 1332 } 1333 EXFAT_I(new_inode)->i_crtime = current_time(new_inode); 1334 } 1335 1336 unlock: 1337 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1338 return err; 1339 } 1340 1341 const struct inode_operations exfat_dir_inode_operations = { 1342 .create = exfat_create, 1343 .lookup = exfat_lookup, 1344 .unlink = exfat_unlink, 1345 .mkdir = exfat_mkdir, 1346 .rmdir = exfat_rmdir, 1347 .rename = exfat_rename, 1348 .setattr = exfat_setattr, 1349 .getattr = exfat_getattr, 1350 .fileattr_get = exfat_fileattr_get, 1351 }; 1352