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 /* we trust p_dir->size regardless of FAT type */ 355 if (exfat_find_last_cluster(sb, p_dir, &last_clu)) 356 return -EIO; 357 358 /* 359 * Allocate new cluster to this directory 360 */ 361 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); 362 363 /* allocate a cluster */ 364 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode)); 365 if (ret) 366 return ret; 367 368 if (exfat_zeroed_cluster(inode, clu.dir)) 369 return -EIO; 370 371 /* append to the FAT chain */ 372 if (clu.flags != p_dir->flags) { 373 /* no-fat-chain bit is disabled, 374 * so fat-chain should be synced with alloc-bitmap 375 */ 376 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); 377 p_dir->flags = ALLOC_FAT_CHAIN; 378 hint_femp.cur.flags = ALLOC_FAT_CHAIN; 379 } 380 381 if (clu.flags == ALLOC_FAT_CHAIN) 382 if (exfat_ent_set(sb, last_clu, clu.dir)) 383 return -EIO; 384 385 if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER) 386 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); 387 388 hint_femp.count += sbi->dentries_per_clu; 389 390 hint_femp.cur.size++; 391 p_dir->size++; 392 size = EXFAT_CLU_TO_B(p_dir->size, sbi); 393 394 /* directory inode should be updated in here */ 395 i_size_write(inode, size); 396 ei->i_size_ondisk += sbi->cluster_size; 397 ei->i_size_aligned += sbi->cluster_size; 398 ei->flags = p_dir->flags; 399 inode->i_blocks += sbi->cluster_size >> 9; 400 } 401 402 return dentry; 403 } 404 405 /* 406 * Name Resolution Functions : 407 * Zero if it was successful; otherwise nonzero. 408 */ 409 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, 410 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 411 int lookup) 412 { 413 int namelen; 414 int lossy = NLS_NAME_NO_LOSSY; 415 struct super_block *sb = inode->i_sb; 416 struct exfat_sb_info *sbi = EXFAT_SB(sb); 417 struct exfat_inode_info *ei = EXFAT_I(inode); 418 int pathlen = strlen(path); 419 420 /* 421 * get the length of the pathname excluding 422 * trailing periods, if any. 423 */ 424 namelen = exfat_striptail_len(pathlen, path, false); 425 if (EXFAT_SB(sb)->options.keep_last_dots) { 426 /* 427 * Do not allow the creation of files with names 428 * ending with period(s). 429 */ 430 if (!lookup && (namelen < pathlen)) 431 return -EINVAL; 432 namelen = pathlen; 433 } 434 if (!namelen) 435 return -ENOENT; 436 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) 437 return -ENAMETOOLONG; 438 439 /* 440 * strip all leading spaces : 441 * "MS windows 7" supports leading spaces. 442 * So we should skip this preprocessing for compatibility. 443 */ 444 445 /* file name conversion : 446 * If lookup case, we allow bad-name for compatibility. 447 */ 448 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, 449 &lossy); 450 if (namelen < 0) 451 return namelen; /* return error value */ 452 453 if ((lossy && !lookup) || !namelen) 454 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL; 455 456 exfat_chain_set(p_dir, ei->start_clu, 457 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); 458 459 return 0; 460 } 461 462 static inline int exfat_resolve_path(struct inode *inode, 463 const unsigned char *path, struct exfat_chain *dir, 464 struct exfat_uni_name *uni) 465 { 466 return __exfat_resolve_path(inode, path, dir, uni, 0); 467 } 468 469 static inline int exfat_resolve_path_for_lookup(struct inode *inode, 470 const unsigned char *path, struct exfat_chain *dir, 471 struct exfat_uni_name *uni) 472 { 473 return __exfat_resolve_path(inode, path, dir, uni, 1); 474 } 475 476 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) 477 { 478 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); 479 } 480 481 static int exfat_add_entry(struct inode *inode, const char *path, 482 struct exfat_chain *p_dir, unsigned int type, 483 struct exfat_dir_entry *info) 484 { 485 int ret, dentry, num_entries; 486 struct super_block *sb = inode->i_sb; 487 struct exfat_sb_info *sbi = EXFAT_SB(sb); 488 struct exfat_uni_name uniname; 489 struct exfat_chain clu; 490 int clu_size = 0; 491 unsigned int start_clu = EXFAT_FREE_CLUSTER; 492 493 ret = exfat_resolve_path(inode, path, p_dir, &uniname); 494 if (ret) 495 goto out; 496 497 num_entries = exfat_calc_num_entries(&uniname); 498 if (num_entries < 0) { 499 ret = num_entries; 500 goto out; 501 } 502 503 /* exfat_find_empty_entry must be called before alloc_cluster() */ 504 dentry = exfat_find_empty_entry(inode, p_dir, num_entries); 505 if (dentry < 0) { 506 ret = dentry; /* -EIO or -ENOSPC */ 507 goto out; 508 } 509 510 if (type == TYPE_DIR) { 511 ret = exfat_alloc_new_dir(inode, &clu); 512 if (ret) 513 goto out; 514 start_clu = clu.dir; 515 clu_size = sbi->cluster_size; 516 } 517 518 /* update the directory entry */ 519 /* fill the dos name directory entry information of the created file. 520 * the first cluster is not determined yet. (0) 521 */ 522 ret = exfat_init_dir_entry(inode, p_dir, dentry, type, 523 start_clu, clu_size); 524 if (ret) 525 goto out; 526 527 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); 528 if (ret) 529 goto out; 530 531 info->dir = *p_dir; 532 info->entry = dentry; 533 info->flags = ALLOC_NO_FAT_CHAIN; 534 info->type = type; 535 536 if (type == TYPE_FILE) { 537 info->attr = ATTR_ARCHIVE; 538 info->start_clu = EXFAT_EOF_CLUSTER; 539 info->size = 0; 540 info->num_subdirs = 0; 541 } else { 542 info->attr = ATTR_SUBDIR; 543 info->start_clu = start_clu; 544 info->size = clu_size; 545 info->num_subdirs = EXFAT_MIN_SUBDIR; 546 } 547 memset(&info->crtime, 0, sizeof(info->crtime)); 548 memset(&info->mtime, 0, sizeof(info->mtime)); 549 memset(&info->atime, 0, sizeof(info->atime)); 550 out: 551 return ret; 552 } 553 554 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, 555 struct dentry *dentry, umode_t mode, bool excl) 556 { 557 struct super_block *sb = dir->i_sb; 558 struct inode *inode; 559 struct exfat_chain cdir; 560 struct exfat_dir_entry info; 561 loff_t i_pos; 562 int err; 563 564 mutex_lock(&EXFAT_SB(sb)->s_lock); 565 exfat_set_volume_dirty(sb); 566 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, 567 &info); 568 if (err) 569 goto unlock; 570 571 inode_inc_iversion(dir); 572 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 573 if (IS_DIRSYNC(dir)) 574 exfat_sync_inode(dir); 575 else 576 mark_inode_dirty(dir); 577 578 i_pos = exfat_make_i_pos(&info); 579 inode = exfat_build_inode(sb, &info, i_pos); 580 err = PTR_ERR_OR_ZERO(inode); 581 if (err) 582 goto unlock; 583 584 inode_inc_iversion(inode); 585 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 586 exfat_truncate_inode_atime(inode); 587 588 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 589 590 d_instantiate(dentry, inode); 591 unlock: 592 mutex_unlock(&EXFAT_SB(sb)->s_lock); 593 return err; 594 } 595 596 /* lookup a file */ 597 static int exfat_find(struct inode *dir, struct qstr *qname, 598 struct exfat_dir_entry *info) 599 { 600 int ret, dentry, count; 601 struct exfat_chain cdir; 602 struct exfat_uni_name uni_name; 603 struct super_block *sb = dir->i_sb; 604 struct exfat_sb_info *sbi = EXFAT_SB(sb); 605 struct exfat_inode_info *ei = EXFAT_I(dir); 606 struct exfat_dentry *ep, *ep2; 607 struct exfat_entry_set_cache es; 608 /* for optimized dir & entry to prevent long traverse of cluster chain */ 609 struct exfat_hint hint_opt; 610 611 if (qname->len == 0) 612 return -ENOENT; 613 614 /* check the validity of directory name in the given pathname */ 615 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); 616 if (ret) 617 return ret; 618 619 /* check the validation of hint_stat and initialize it if required */ 620 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 621 ei->hint_stat.clu = cdir.dir; 622 ei->hint_stat.eidx = 0; 623 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 624 ei->hint_femp.eidx = EXFAT_HINT_NONE; 625 } 626 627 /* search the file name for directories */ 628 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt); 629 if (dentry < 0) 630 return dentry; /* -error value */ 631 632 info->dir = cdir; 633 info->entry = dentry; 634 info->num_subdirs = 0; 635 636 /* adjust cdir to the optimized value */ 637 cdir.dir = hint_opt.clu; 638 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 639 cdir.size -= dentry / sbi->dentries_per_clu; 640 dentry = hint_opt.eidx; 641 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES)) 642 return -EIO; 643 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE); 644 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM); 645 646 info->type = exfat_get_entry_type(ep); 647 info->attr = le16_to_cpu(ep->dentry.file.attr); 648 info->size = le64_to_cpu(ep2->dentry.stream.valid_size); 649 if ((info->type == TYPE_FILE) && (info->size == 0)) { 650 info->flags = ALLOC_NO_FAT_CHAIN; 651 info->start_clu = EXFAT_EOF_CLUSTER; 652 } else { 653 info->flags = ep2->dentry.stream.flags; 654 info->start_clu = 655 le32_to_cpu(ep2->dentry.stream.start_clu); 656 } 657 658 exfat_get_entry_time(sbi, &info->crtime, 659 ep->dentry.file.create_tz, 660 ep->dentry.file.create_time, 661 ep->dentry.file.create_date, 662 ep->dentry.file.create_time_cs); 663 exfat_get_entry_time(sbi, &info->mtime, 664 ep->dentry.file.modify_tz, 665 ep->dentry.file.modify_time, 666 ep->dentry.file.modify_date, 667 ep->dentry.file.modify_time_cs); 668 exfat_get_entry_time(sbi, &info->atime, 669 ep->dentry.file.access_tz, 670 ep->dentry.file.access_time, 671 ep->dentry.file.access_date, 672 0); 673 exfat_put_dentry_set(&es, false); 674 675 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 676 exfat_fs_error(sb, 677 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 678 i_size_read(dir), ei->dir.dir, ei->entry); 679 return -EIO; 680 } 681 682 if (info->type == TYPE_DIR) { 683 exfat_chain_set(&cdir, info->start_clu, 684 EXFAT_B_TO_CLU(info->size, sbi), info->flags); 685 count = exfat_count_dir_entries(sb, &cdir); 686 if (count < 0) 687 return -EIO; 688 689 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 690 } 691 return 0; 692 } 693 694 static int exfat_d_anon_disconn(struct dentry *dentry) 695 { 696 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); 697 } 698 699 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 700 unsigned int flags) 701 { 702 struct super_block *sb = dir->i_sb; 703 struct inode *inode; 704 struct dentry *alias; 705 struct exfat_dir_entry info; 706 int err; 707 loff_t i_pos; 708 mode_t i_mode; 709 710 mutex_lock(&EXFAT_SB(sb)->s_lock); 711 err = exfat_find(dir, &dentry->d_name, &info); 712 if (err) { 713 if (err == -ENOENT) { 714 inode = NULL; 715 goto out; 716 } 717 goto unlock; 718 } 719 720 i_pos = exfat_make_i_pos(&info); 721 inode = exfat_build_inode(sb, &info, i_pos); 722 err = PTR_ERR_OR_ZERO(inode); 723 if (err) 724 goto unlock; 725 726 i_mode = inode->i_mode; 727 alias = d_find_alias(inode); 728 729 /* 730 * Checking "alias->d_parent == dentry->d_parent" to make sure 731 * FS is not corrupted (especially double linked dir). 732 */ 733 if (alias && alias->d_parent == dentry->d_parent && 734 !exfat_d_anon_disconn(alias)) { 735 736 /* 737 * Unhashed alias is able to exist because of revalidate() 738 * called by lookup_fast. You can easily make this status 739 * by calling create and lookup concurrently 740 * In such case, we reuse an alias instead of new dentry 741 */ 742 if (d_unhashed(alias)) { 743 WARN_ON(alias->d_name.hash_len != 744 dentry->d_name.hash_len); 745 exfat_info(sb, "rehashed a dentry(%p) in read lookup", 746 alias); 747 d_drop(dentry); 748 d_rehash(alias); 749 } else if (!S_ISDIR(i_mode)) { 750 /* 751 * This inode has non anonymous-DCACHE_DISCONNECTED 752 * dentry. This means, the user did ->lookup() by an 753 * another name (longname vs 8.3 alias of it) in past. 754 * 755 * Switch to new one for reason of locality if possible. 756 */ 757 d_move(alias, dentry); 758 } 759 iput(inode); 760 mutex_unlock(&EXFAT_SB(sb)->s_lock); 761 return alias; 762 } 763 dput(alias); 764 out: 765 mutex_unlock(&EXFAT_SB(sb)->s_lock); 766 if (!inode) 767 exfat_d_version_set(dentry, inode_query_iversion(dir)); 768 769 return d_splice_alias(inode, dentry); 770 unlock: 771 mutex_unlock(&EXFAT_SB(sb)->s_lock); 772 return ERR_PTR(err); 773 } 774 775 /* remove an entry, BUT don't truncate */ 776 static int exfat_unlink(struct inode *dir, struct dentry *dentry) 777 { 778 struct exfat_chain cdir; 779 struct exfat_dentry *ep; 780 struct super_block *sb = dir->i_sb; 781 struct inode *inode = dentry->d_inode; 782 struct exfat_inode_info *ei = EXFAT_I(inode); 783 struct buffer_head *bh; 784 int num_entries, entry, err = 0; 785 786 mutex_lock(&EXFAT_SB(sb)->s_lock); 787 exfat_chain_dup(&cdir, &ei->dir); 788 entry = ei->entry; 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 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 796 if (!ep) { 797 err = -EIO; 798 goto unlock; 799 } 800 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 801 if (num_entries < 0) { 802 err = -EIO; 803 brelse(bh); 804 goto unlock; 805 } 806 num_entries++; 807 brelse(bh); 808 809 exfat_set_volume_dirty(sb); 810 /* update the directory entry */ 811 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { 812 err = -EIO; 813 goto unlock; 814 } 815 816 /* This doesn't modify ei */ 817 ei->dir.dir = DIR_DELETED; 818 819 inode_inc_iversion(dir); 820 simple_inode_init_ts(dir); 821 exfat_truncate_inode_atime(dir); 822 if (IS_DIRSYNC(dir)) 823 exfat_sync_inode(dir); 824 else 825 mark_inode_dirty(dir); 826 827 clear_nlink(inode); 828 simple_inode_init_ts(inode); 829 exfat_truncate_inode_atime(inode); 830 exfat_unhash_inode(inode); 831 exfat_d_version_set(dentry, inode_query_iversion(dir)); 832 unlock: 833 mutex_unlock(&EXFAT_SB(sb)->s_lock); 834 return err; 835 } 836 837 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, 838 struct dentry *dentry, umode_t mode) 839 { 840 struct super_block *sb = dir->i_sb; 841 struct inode *inode; 842 struct exfat_dir_entry info; 843 struct exfat_chain cdir; 844 loff_t i_pos; 845 int err; 846 847 mutex_lock(&EXFAT_SB(sb)->s_lock); 848 exfat_set_volume_dirty(sb); 849 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, 850 &info); 851 if (err) 852 goto unlock; 853 854 inode_inc_iversion(dir); 855 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 856 if (IS_DIRSYNC(dir)) 857 exfat_sync_inode(dir); 858 else 859 mark_inode_dirty(dir); 860 inc_nlink(dir); 861 862 i_pos = exfat_make_i_pos(&info); 863 inode = exfat_build_inode(sb, &info, i_pos); 864 err = PTR_ERR_OR_ZERO(inode); 865 if (err) 866 goto unlock; 867 868 inode_inc_iversion(inode); 869 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 870 exfat_truncate_inode_atime(inode); 871 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 872 873 d_instantiate(dentry, inode); 874 875 unlock: 876 mutex_unlock(&EXFAT_SB(sb)->s_lock); 877 return err; 878 } 879 880 static int exfat_check_dir_empty(struct super_block *sb, 881 struct exfat_chain *p_dir) 882 { 883 int i, dentries_per_clu; 884 unsigned int type; 885 struct exfat_chain clu; 886 struct exfat_dentry *ep; 887 struct exfat_sb_info *sbi = EXFAT_SB(sb); 888 struct buffer_head *bh; 889 890 dentries_per_clu = sbi->dentries_per_clu; 891 892 exfat_chain_dup(&clu, p_dir); 893 894 while (clu.dir != EXFAT_EOF_CLUSTER) { 895 for (i = 0; i < dentries_per_clu; i++) { 896 ep = exfat_get_dentry(sb, &clu, i, &bh); 897 if (!ep) 898 return -EIO; 899 type = exfat_get_entry_type(ep); 900 brelse(bh); 901 if (type == TYPE_UNUSED) 902 return 0; 903 904 if (type != TYPE_FILE && type != TYPE_DIR) 905 continue; 906 907 return -ENOTEMPTY; 908 } 909 910 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 911 if (--clu.size > 0) 912 clu.dir++; 913 else 914 clu.dir = EXFAT_EOF_CLUSTER; 915 } else { 916 if (exfat_get_next_cluster(sb, &(clu.dir))) 917 return -EIO; 918 } 919 } 920 921 return 0; 922 } 923 924 static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 925 { 926 struct inode *inode = dentry->d_inode; 927 struct exfat_dentry *ep; 928 struct exfat_chain cdir, clu_to_free; 929 struct super_block *sb = inode->i_sb; 930 struct exfat_sb_info *sbi = EXFAT_SB(sb); 931 struct exfat_inode_info *ei = EXFAT_I(inode); 932 struct buffer_head *bh; 933 int num_entries, entry, err; 934 935 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 936 937 exfat_chain_dup(&cdir, &ei->dir); 938 entry = ei->entry; 939 940 if (ei->dir.dir == DIR_DELETED) { 941 exfat_err(sb, "abnormal access to deleted dentry"); 942 err = -ENOENT; 943 goto unlock; 944 } 945 946 exfat_chain_set(&clu_to_free, ei->start_clu, 947 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); 948 949 err = exfat_check_dir_empty(sb, &clu_to_free); 950 if (err) { 951 if (err == -EIO) 952 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 953 err); 954 goto unlock; 955 } 956 957 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 958 if (!ep) { 959 err = -EIO; 960 goto unlock; 961 } 962 963 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 964 if (num_entries < 0) { 965 err = -EIO; 966 brelse(bh); 967 goto unlock; 968 } 969 num_entries++; 970 brelse(bh); 971 972 exfat_set_volume_dirty(sb); 973 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); 974 if (err) { 975 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); 976 goto unlock; 977 } 978 ei->dir.dir = DIR_DELETED; 979 980 inode_inc_iversion(dir); 981 simple_inode_init_ts(dir); 982 exfat_truncate_inode_atime(dir); 983 if (IS_DIRSYNC(dir)) 984 exfat_sync_inode(dir); 985 else 986 mark_inode_dirty(dir); 987 drop_nlink(dir); 988 989 clear_nlink(inode); 990 simple_inode_init_ts(inode); 991 exfat_truncate_inode_atime(inode); 992 exfat_unhash_inode(inode); 993 exfat_d_version_set(dentry, inode_query_iversion(dir)); 994 unlock: 995 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 996 return err; 997 } 998 999 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, 1000 int oldentry, struct exfat_uni_name *p_uniname, 1001 struct exfat_inode_info *ei) 1002 { 1003 int ret, num_old_entries, num_new_entries; 1004 struct exfat_dentry *epold, *epnew; 1005 struct super_block *sb = inode->i_sb; 1006 struct buffer_head *new_bh, *old_bh; 1007 int sync = IS_DIRSYNC(inode); 1008 1009 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh); 1010 if (!epold) 1011 return -EIO; 1012 1013 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); 1014 if (num_old_entries < 0) 1015 return -EIO; 1016 num_old_entries++; 1017 1018 num_new_entries = exfat_calc_num_entries(p_uniname); 1019 if (num_new_entries < 0) 1020 return num_new_entries; 1021 1022 if (num_old_entries < num_new_entries) { 1023 int newentry; 1024 1025 newentry = 1026 exfat_find_empty_entry(inode, p_dir, num_new_entries); 1027 if (newentry < 0) 1028 return newentry; /* -EIO or -ENOSPC */ 1029 1030 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh); 1031 if (!epnew) 1032 return -EIO; 1033 1034 *epnew = *epold; 1035 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1036 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1037 ei->attr |= ATTR_ARCHIVE; 1038 } 1039 exfat_update_bh(new_bh, sync); 1040 brelse(old_bh); 1041 brelse(new_bh); 1042 1043 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh); 1044 if (!epold) 1045 return -EIO; 1046 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); 1047 if (!epnew) { 1048 brelse(old_bh); 1049 return -EIO; 1050 } 1051 1052 *epnew = *epold; 1053 exfat_update_bh(new_bh, sync); 1054 brelse(old_bh); 1055 brelse(new_bh); 1056 1057 ret = exfat_init_ext_entry(inode, p_dir, newentry, 1058 num_new_entries, p_uniname); 1059 if (ret) 1060 return ret; 1061 1062 exfat_remove_entries(inode, p_dir, oldentry, 0, 1063 num_old_entries); 1064 ei->dir = *p_dir; 1065 ei->entry = newentry; 1066 } else { 1067 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1068 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1069 ei->attr |= ATTR_ARCHIVE; 1070 } 1071 exfat_update_bh(old_bh, sync); 1072 brelse(old_bh); 1073 ret = exfat_init_ext_entry(inode, p_dir, oldentry, 1074 num_new_entries, p_uniname); 1075 if (ret) 1076 return ret; 1077 1078 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries, 1079 num_old_entries); 1080 } 1081 return 0; 1082 } 1083 1084 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, 1085 int oldentry, struct exfat_chain *p_newdir, 1086 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1087 { 1088 int ret, newentry, num_new_entries, num_old_entries; 1089 struct exfat_dentry *epmov, *epnew; 1090 struct super_block *sb = inode->i_sb; 1091 struct buffer_head *mov_bh, *new_bh; 1092 1093 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh); 1094 if (!epmov) 1095 return -EIO; 1096 1097 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, 1098 epmov); 1099 if (num_old_entries < 0) 1100 return -EIO; 1101 num_old_entries++; 1102 1103 num_new_entries = exfat_calc_num_entries(p_uniname); 1104 if (num_new_entries < 0) 1105 return num_new_entries; 1106 1107 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); 1108 if (newentry < 0) 1109 return newentry; /* -EIO or -ENOSPC */ 1110 1111 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh); 1112 if (!epnew) 1113 return -EIO; 1114 1115 *epnew = *epmov; 1116 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1117 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1118 ei->attr |= ATTR_ARCHIVE; 1119 } 1120 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1121 brelse(mov_bh); 1122 brelse(new_bh); 1123 1124 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh); 1125 if (!epmov) 1126 return -EIO; 1127 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); 1128 if (!epnew) { 1129 brelse(mov_bh); 1130 return -EIO; 1131 } 1132 1133 *epnew = *epmov; 1134 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1135 brelse(mov_bh); 1136 brelse(new_bh); 1137 1138 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, 1139 p_uniname); 1140 if (ret) 1141 return ret; 1142 1143 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); 1144 1145 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, 1146 p_newdir->flags); 1147 1148 ei->entry = newentry; 1149 return 0; 1150 } 1151 1152 /* rename or move a old file into a new file */ 1153 static int __exfat_rename(struct inode *old_parent_inode, 1154 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1155 struct dentry *new_dentry) 1156 { 1157 int ret; 1158 int dentry; 1159 struct exfat_chain olddir, newdir; 1160 struct exfat_chain *p_dir = NULL; 1161 struct exfat_uni_name uni_name; 1162 struct exfat_dentry *ep; 1163 struct super_block *sb = old_parent_inode->i_sb; 1164 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1165 const unsigned char *new_path = new_dentry->d_name.name; 1166 struct inode *new_inode = new_dentry->d_inode; 1167 int num_entries; 1168 struct exfat_inode_info *new_ei = NULL; 1169 unsigned int new_entry_type = TYPE_UNUSED; 1170 int new_entry = 0; 1171 struct buffer_head *new_bh = NULL; 1172 1173 /* check the validity of pointer parameters */ 1174 if (new_path == NULL || strlen(new_path) == 0) 1175 return -EINVAL; 1176 1177 if (ei->dir.dir == DIR_DELETED) { 1178 exfat_err(sb, "abnormal access to deleted source dentry"); 1179 return -ENOENT; 1180 } 1181 1182 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, 1183 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), 1184 EXFAT_I(old_parent_inode)->flags); 1185 dentry = ei->entry; 1186 1187 /* check whether new dir is existing directory and empty */ 1188 if (new_inode) { 1189 ret = -EIO; 1190 new_ei = EXFAT_I(new_inode); 1191 1192 if (new_ei->dir.dir == DIR_DELETED) { 1193 exfat_err(sb, "abnormal access to deleted target dentry"); 1194 goto out; 1195 } 1196 1197 p_dir = &(new_ei->dir); 1198 new_entry = new_ei->entry; 1199 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1200 if (!ep) 1201 goto out; 1202 1203 new_entry_type = exfat_get_entry_type(ep); 1204 brelse(new_bh); 1205 1206 /* if new_inode exists, update ei */ 1207 if (new_entry_type == TYPE_DIR) { 1208 struct exfat_chain new_clu; 1209 1210 new_clu.dir = new_ei->start_clu; 1211 new_clu.size = 1212 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1213 sbi); 1214 new_clu.flags = new_ei->flags; 1215 1216 ret = exfat_check_dir_empty(sb, &new_clu); 1217 if (ret) 1218 goto out; 1219 } 1220 } 1221 1222 /* check the validity of directory name in the given new pathname */ 1223 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, 1224 &uni_name); 1225 if (ret) 1226 goto out; 1227 1228 exfat_set_volume_dirty(sb); 1229 1230 if (olddir.dir == newdir.dir) 1231 ret = exfat_rename_file(new_parent_inode, &olddir, dentry, 1232 &uni_name, ei); 1233 else 1234 ret = exfat_move_file(new_parent_inode, &olddir, dentry, 1235 &newdir, &uni_name, ei); 1236 1237 if (!ret && new_inode) { 1238 /* delete entries of new_dir */ 1239 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1240 if (!ep) { 1241 ret = -EIO; 1242 goto del_out; 1243 } 1244 1245 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); 1246 if (num_entries < 0) { 1247 ret = -EIO; 1248 goto del_out; 1249 } 1250 brelse(new_bh); 1251 1252 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, 1253 num_entries + 1)) { 1254 ret = -EIO; 1255 goto del_out; 1256 } 1257 1258 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1259 if (new_entry_type == TYPE_DIR) { 1260 /* new_ei, new_clu_to_free */ 1261 struct exfat_chain new_clu_to_free; 1262 1263 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1264 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1265 sbi), new_ei->flags); 1266 1267 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1268 /* just set I/O error only */ 1269 ret = -EIO; 1270 } 1271 1272 i_size_write(new_inode, 0); 1273 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1274 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1275 } 1276 del_out: 1277 /* Update new_inode ei 1278 * Prevent syncing removed new_inode 1279 * (new_ei is already initialized above code ("if (new_inode)") 1280 */ 1281 new_ei->dir.dir = DIR_DELETED; 1282 } 1283 out: 1284 return ret; 1285 } 1286 1287 static int exfat_rename(struct mnt_idmap *idmap, 1288 struct inode *old_dir, struct dentry *old_dentry, 1289 struct inode *new_dir, struct dentry *new_dentry, 1290 unsigned int flags) 1291 { 1292 struct inode *old_inode, *new_inode; 1293 struct super_block *sb = old_dir->i_sb; 1294 loff_t i_pos; 1295 int err; 1296 1297 /* 1298 * The VFS already checks for existence, so for local filesystems 1299 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1300 * Don't support any other flags 1301 */ 1302 if (flags & ~RENAME_NOREPLACE) 1303 return -EINVAL; 1304 1305 mutex_lock(&EXFAT_SB(sb)->s_lock); 1306 old_inode = old_dentry->d_inode; 1307 new_inode = new_dentry->d_inode; 1308 1309 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1310 if (err) 1311 goto unlock; 1312 1313 inode_inc_iversion(new_dir); 1314 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); 1315 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1316 exfat_truncate_inode_atime(new_dir); 1317 if (IS_DIRSYNC(new_dir)) 1318 exfat_sync_inode(new_dir); 1319 else 1320 mark_inode_dirty(new_dir); 1321 1322 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1323 (EXFAT_I(old_inode)->entry & 0xffffffff); 1324 exfat_unhash_inode(old_inode); 1325 exfat_hash_inode(old_inode, i_pos); 1326 if (IS_DIRSYNC(new_dir)) 1327 exfat_sync_inode(old_inode); 1328 else 1329 mark_inode_dirty(old_inode); 1330 1331 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1332 drop_nlink(old_dir); 1333 if (!new_inode) 1334 inc_nlink(new_dir); 1335 } 1336 1337 inode_inc_iversion(old_dir); 1338 if (IS_DIRSYNC(old_dir)) 1339 exfat_sync_inode(old_dir); 1340 else 1341 mark_inode_dirty(old_dir); 1342 1343 if (new_inode) { 1344 exfat_unhash_inode(new_inode); 1345 1346 /* skip drop_nlink if new_inode already has been dropped */ 1347 if (new_inode->i_nlink) { 1348 drop_nlink(new_inode); 1349 if (S_ISDIR(new_inode->i_mode)) 1350 drop_nlink(new_inode); 1351 } else { 1352 exfat_warn(sb, "abnormal access to an inode dropped"); 1353 WARN_ON(new_inode->i_nlink == 0); 1354 } 1355 EXFAT_I(new_inode)->i_crtime = current_time(new_inode); 1356 } 1357 1358 unlock: 1359 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1360 return err; 1361 } 1362 1363 const struct inode_operations exfat_dir_inode_operations = { 1364 .create = exfat_create, 1365 .lookup = exfat_lookup, 1366 .unlink = exfat_unlink, 1367 .mkdir = exfat_mkdir, 1368 .rmdir = exfat_rmdir, 1369 .rename = exfat_rename, 1370 .setattr = exfat_setattr, 1371 .getattr = exfat_getattr, 1372 }; 1373