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 15static inline unsigned long exfat_d_version(struct dentry *dentry) 16{ 17 return (unsigned long) dentry->d_fsdata; 18} 19 20static 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 */ 34static 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 */ 69static 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 */ 84static 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 106static 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 135const 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 141static 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 167static 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 201const 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 */ 211static 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 312static 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 */ 327static int exfat_find_empty_entry(struct inode *inode, 328 struct exfat_chain *p_dir, int num_entries) 329{ 330 int dentry; 331 unsigned int ret, last_clu; 332 loff_t size = 0; 333 struct exfat_chain clu; 334 struct super_block *sb = inode->i_sb; 335 struct exfat_sb_info *sbi = EXFAT_SB(sb); 336 struct exfat_inode_info *ei = EXFAT_I(inode); 337 struct exfat_hint_femp hint_femp; 338 339 hint_femp.eidx = EXFAT_HINT_NONE; 340 341 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { 342 hint_femp = ei->hint_femp; 343 ei->hint_femp.eidx = EXFAT_HINT_NONE; 344 } 345 346 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir, 347 num_entries)) < 0) { 348 if (dentry == -EIO) 349 break; 350 351 if (exfat_check_max_dentries(inode)) 352 return -ENOSPC; 353 354 /* 355 * Allocate new cluster to this directory 356 */ 357 if (ei->start_clu != EXFAT_EOF_CLUSTER) { 358 /* we trust p_dir->size regardless of FAT type */ 359 if (exfat_find_last_cluster(sb, p_dir, &last_clu)) 360 return -EIO; 361 362 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); 363 } else { 364 /* This directory is empty */ 365 exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0, 366 ALLOC_NO_FAT_CHAIN); 367 } 368 369 /* allocate a cluster */ 370 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode)); 371 if (ret) 372 return ret; 373 374 if (exfat_zeroed_cluster(inode, clu.dir)) 375 return -EIO; 376 377 if (ei->start_clu == EXFAT_EOF_CLUSTER) { 378 ei->start_clu = clu.dir; 379 p_dir->dir = clu.dir; 380 } 381 382 /* append to the FAT chain */ 383 if (clu.flags != p_dir->flags) { 384 /* no-fat-chain bit is disabled, 385 * so fat-chain should be synced with alloc-bitmap 386 */ 387 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); 388 p_dir->flags = ALLOC_FAT_CHAIN; 389 hint_femp.cur.flags = ALLOC_FAT_CHAIN; 390 } 391 392 if (clu.flags == ALLOC_FAT_CHAIN) 393 if (exfat_ent_set(sb, last_clu, clu.dir)) 394 return -EIO; 395 396 if (hint_femp.cur.dir == EXFAT_EOF_CLUSTER) 397 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); 398 399 hint_femp.count += sbi->dentries_per_clu; 400 401 hint_femp.cur.size++; 402 p_dir->size++; 403 size = EXFAT_CLU_TO_B(p_dir->size, sbi); 404 405 /* directory inode should be updated in here */ 406 i_size_write(inode, size); 407 ei->i_size_ondisk += sbi->cluster_size; 408 ei->i_size_aligned += sbi->cluster_size; 409 ei->flags = p_dir->flags; 410 inode->i_blocks += sbi->cluster_size >> 9; 411 } 412 413 return dentry; 414} 415 416/* 417 * Name Resolution Functions : 418 * Zero if it was successful; otherwise nonzero. 419 */ 420static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, 421 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 422 int lookup) 423{ 424 int namelen; 425 int lossy = NLS_NAME_NO_LOSSY; 426 struct super_block *sb = inode->i_sb; 427 struct exfat_sb_info *sbi = EXFAT_SB(sb); 428 struct exfat_inode_info *ei = EXFAT_I(inode); 429 int pathlen = strlen(path); 430 431 /* 432 * get the length of the pathname excluding 433 * trailing periods, if any. 434 */ 435 namelen = exfat_striptail_len(pathlen, path, false); 436 if (EXFAT_SB(sb)->options.keep_last_dots) { 437 /* 438 * Do not allow the creation of files with names 439 * ending with period(s). 440 */ 441 if (!lookup && (namelen < pathlen)) 442 return -EINVAL; 443 namelen = pathlen; 444 } 445 if (!namelen) 446 return -ENOENT; 447 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) 448 return -ENAMETOOLONG; 449 450 /* 451 * strip all leading spaces : 452 * "MS windows 7" supports leading spaces. 453 * So we should skip this preprocessing for compatibility. 454 */ 455 456 /* file name conversion : 457 * If lookup case, we allow bad-name for compatibility. 458 */ 459 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, 460 &lossy); 461 if (namelen < 0) 462 return namelen; /* return error value */ 463 464 if ((lossy && !lookup) || !namelen) 465 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL; 466 467 exfat_chain_set(p_dir, ei->start_clu, 468 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); 469 470 return 0; 471} 472 473static inline int exfat_resolve_path(struct inode *inode, 474 const unsigned char *path, struct exfat_chain *dir, 475 struct exfat_uni_name *uni) 476{ 477 return __exfat_resolve_path(inode, path, dir, uni, 0); 478} 479 480static inline int exfat_resolve_path_for_lookup(struct inode *inode, 481 const unsigned char *path, struct exfat_chain *dir, 482 struct exfat_uni_name *uni) 483{ 484 return __exfat_resolve_path(inode, path, dir, uni, 1); 485} 486 487static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) 488{ 489 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); 490} 491 492static int exfat_add_entry(struct inode *inode, const char *path, 493 struct exfat_chain *p_dir, unsigned int type, 494 struct exfat_dir_entry *info) 495{ 496 int ret, dentry, num_entries; 497 struct super_block *sb = inode->i_sb; 498 struct exfat_sb_info *sbi = EXFAT_SB(sb); 499 struct exfat_uni_name uniname; 500 struct exfat_chain clu; 501 int clu_size = 0; 502 unsigned int start_clu = EXFAT_FREE_CLUSTER; 503 504 ret = exfat_resolve_path(inode, path, p_dir, &uniname); 505 if (ret) 506 goto out; 507 508 num_entries = exfat_calc_num_entries(&uniname); 509 if (num_entries < 0) { 510 ret = num_entries; 511 goto out; 512 } 513 514 /* exfat_find_empty_entry must be called before alloc_cluster() */ 515 dentry = exfat_find_empty_entry(inode, p_dir, num_entries); 516 if (dentry < 0) { 517 ret = dentry; /* -EIO or -ENOSPC */ 518 goto out; 519 } 520 521 if (type == TYPE_DIR) { 522 ret = exfat_alloc_new_dir(inode, &clu); 523 if (ret) 524 goto out; 525 start_clu = clu.dir; 526 clu_size = sbi->cluster_size; 527 } 528 529 /* update the directory entry */ 530 /* fill the dos name directory entry information of the created file. 531 * the first cluster is not determined yet. (0) 532 */ 533 ret = exfat_init_dir_entry(inode, p_dir, dentry, type, 534 start_clu, clu_size); 535 if (ret) 536 goto out; 537 538 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); 539 if (ret) 540 goto out; 541 542 info->dir = *p_dir; 543 info->entry = dentry; 544 info->flags = ALLOC_NO_FAT_CHAIN; 545 info->type = type; 546 547 if (type == TYPE_FILE) { 548 info->attr = ATTR_ARCHIVE; 549 info->start_clu = EXFAT_EOF_CLUSTER; 550 info->size = 0; 551 info->num_subdirs = 0; 552 } else { 553 info->attr = ATTR_SUBDIR; 554 info->start_clu = start_clu; 555 info->size = clu_size; 556 info->num_subdirs = EXFAT_MIN_SUBDIR; 557 } 558 memset(&info->crtime, 0, sizeof(info->crtime)); 559 memset(&info->mtime, 0, sizeof(info->mtime)); 560 memset(&info->atime, 0, sizeof(info->atime)); 561out: 562 return ret; 563} 564 565static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, 566 struct dentry *dentry, umode_t mode, bool excl) 567{ 568 struct super_block *sb = dir->i_sb; 569 struct inode *inode; 570 struct exfat_chain cdir; 571 struct exfat_dir_entry info; 572 loff_t i_pos; 573 int err; 574 575 mutex_lock(&EXFAT_SB(sb)->s_lock); 576 exfat_set_volume_dirty(sb); 577 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, 578 &info); 579 if (err) 580 goto unlock; 581 582 inode_inc_iversion(dir); 583 dir->i_mtime = inode_set_ctime_current(dir); 584 if (IS_DIRSYNC(dir)) 585 exfat_sync_inode(dir); 586 else 587 mark_inode_dirty(dir); 588 589 i_pos = exfat_make_i_pos(&info); 590 inode = exfat_build_inode(sb, &info, i_pos); 591 err = PTR_ERR_OR_ZERO(inode); 592 if (err) 593 goto unlock; 594 595 inode_inc_iversion(inode); 596 inode->i_mtime = inode->i_atime = EXFAT_I(inode)->i_crtime = inode_set_ctime_current(inode); 597 exfat_truncate_atime(&inode->i_atime); 598 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 599 600 d_instantiate(dentry, inode); 601unlock: 602 mutex_unlock(&EXFAT_SB(sb)->s_lock); 603 return err; 604} 605 606/* lookup a file */ 607static int exfat_find(struct inode *dir, struct qstr *qname, 608 struct exfat_dir_entry *info) 609{ 610 int ret, dentry, count; 611 struct exfat_chain cdir; 612 struct exfat_uni_name uni_name; 613 struct super_block *sb = dir->i_sb; 614 struct exfat_sb_info *sbi = EXFAT_SB(sb); 615 struct exfat_inode_info *ei = EXFAT_I(dir); 616 struct exfat_dentry *ep, *ep2; 617 struct exfat_entry_set_cache es; 618 /* for optimized dir & entry to prevent long traverse of cluster chain */ 619 struct exfat_hint hint_opt; 620 621 if (qname->len == 0) 622 return -ENOENT; 623 624 /* check the validity of directory name in the given pathname */ 625 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); 626 if (ret) 627 return ret; 628 629 /* check the validation of hint_stat and initialize it if required */ 630 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 631 ei->hint_stat.clu = cdir.dir; 632 ei->hint_stat.eidx = 0; 633 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 634 ei->hint_femp.eidx = EXFAT_HINT_NONE; 635 } 636 637 /* search the file name for directories */ 638 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt); 639 if (dentry < 0) 640 return dentry; /* -error value */ 641 642 info->dir = cdir; 643 info->entry = dentry; 644 info->num_subdirs = 0; 645 646 /* adjust cdir to the optimized value */ 647 cdir.dir = hint_opt.clu; 648 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 649 cdir.size -= dentry / sbi->dentries_per_clu; 650 dentry = hint_opt.eidx; 651 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES)) 652 return -EIO; 653 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE); 654 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM); 655 656 info->type = exfat_get_entry_type(ep); 657 info->attr = le16_to_cpu(ep->dentry.file.attr); 658 info->size = le64_to_cpu(ep2->dentry.stream.valid_size); 659 if (info->size == 0) { 660 info->flags = ALLOC_NO_FAT_CHAIN; 661 info->start_clu = EXFAT_EOF_CLUSTER; 662 } else { 663 info->flags = ep2->dentry.stream.flags; 664 info->start_clu = 665 le32_to_cpu(ep2->dentry.stream.start_clu); 666 } 667 668 exfat_get_entry_time(sbi, &info->crtime, 669 ep->dentry.file.create_tz, 670 ep->dentry.file.create_time, 671 ep->dentry.file.create_date, 672 ep->dentry.file.create_time_cs); 673 exfat_get_entry_time(sbi, &info->mtime, 674 ep->dentry.file.modify_tz, 675 ep->dentry.file.modify_time, 676 ep->dentry.file.modify_date, 677 ep->dentry.file.modify_time_cs); 678 exfat_get_entry_time(sbi, &info->atime, 679 ep->dentry.file.access_tz, 680 ep->dentry.file.access_time, 681 ep->dentry.file.access_date, 682 0); 683 exfat_put_dentry_set(&es, false); 684 685 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 686 exfat_fs_error(sb, 687 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 688 i_size_read(dir), ei->dir.dir, ei->entry); 689 return -EIO; 690 } 691 692 if (info->type == TYPE_DIR) { 693 exfat_chain_set(&cdir, info->start_clu, 694 EXFAT_B_TO_CLU(info->size, sbi), info->flags); 695 count = exfat_count_dir_entries(sb, &cdir); 696 if (count < 0) 697 return -EIO; 698 699 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 700 } 701 return 0; 702} 703 704static int exfat_d_anon_disconn(struct dentry *dentry) 705{ 706 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); 707} 708 709static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 710 unsigned int flags) 711{ 712 struct super_block *sb = dir->i_sb; 713 struct inode *inode; 714 struct dentry *alias; 715 struct exfat_dir_entry info; 716 int err; 717 loff_t i_pos; 718 mode_t i_mode; 719 720 mutex_lock(&EXFAT_SB(sb)->s_lock); 721 err = exfat_find(dir, &dentry->d_name, &info); 722 if (err) { 723 if (err == -ENOENT) { 724 inode = NULL; 725 goto out; 726 } 727 goto unlock; 728 } 729 730 i_pos = exfat_make_i_pos(&info); 731 inode = exfat_build_inode(sb, &info, i_pos); 732 err = PTR_ERR_OR_ZERO(inode); 733 if (err) 734 goto unlock; 735 736 i_mode = inode->i_mode; 737 alias = d_find_alias(inode); 738 739 /* 740 * Checking "alias->d_parent == dentry->d_parent" to make sure 741 * FS is not corrupted (especially double linked dir). 742 */ 743 if (alias && alias->d_parent == dentry->d_parent && 744 !exfat_d_anon_disconn(alias)) { 745 746 /* 747 * Unhashed alias is able to exist because of revalidate() 748 * called by lookup_fast. You can easily make this status 749 * by calling create and lookup concurrently 750 * In such case, we reuse an alias instead of new dentry 751 */ 752 if (d_unhashed(alias)) { 753 WARN_ON(alias->d_name.hash_len != 754 dentry->d_name.hash_len); 755 exfat_info(sb, "rehashed a dentry(%p) in read lookup", 756 alias); 757 d_drop(dentry); 758 d_rehash(alias); 759 } else if (!S_ISDIR(i_mode)) { 760 /* 761 * This inode has non anonymous-DCACHE_DISCONNECTED 762 * dentry. This means, the user did ->lookup() by an 763 * another name (longname vs 8.3 alias of it) in past. 764 * 765 * Switch to new one for reason of locality if possible. 766 */ 767 d_move(alias, dentry); 768 } 769 iput(inode); 770 mutex_unlock(&EXFAT_SB(sb)->s_lock); 771 return alias; 772 } 773 dput(alias); 774out: 775 mutex_unlock(&EXFAT_SB(sb)->s_lock); 776 if (!inode) 777 exfat_d_version_set(dentry, inode_query_iversion(dir)); 778 779 return d_splice_alias(inode, dentry); 780unlock: 781 mutex_unlock(&EXFAT_SB(sb)->s_lock); 782 return ERR_PTR(err); 783} 784 785/* remove an entry, BUT don't truncate */ 786static int exfat_unlink(struct inode *dir, struct dentry *dentry) 787{ 788 struct exfat_chain cdir; 789 struct exfat_dentry *ep; 790 struct super_block *sb = dir->i_sb; 791 struct inode *inode = dentry->d_inode; 792 struct exfat_inode_info *ei = EXFAT_I(inode); 793 struct buffer_head *bh; 794 int num_entries, entry, err = 0; 795 796 mutex_lock(&EXFAT_SB(sb)->s_lock); 797 exfat_chain_dup(&cdir, &ei->dir); 798 entry = ei->entry; 799 if (ei->dir.dir == DIR_DELETED) { 800 exfat_err(sb, "abnormal access to deleted dentry"); 801 err = -ENOENT; 802 goto unlock; 803 } 804 805 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 806 if (!ep) { 807 err = -EIO; 808 goto unlock; 809 } 810 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 811 if (num_entries < 0) { 812 err = -EIO; 813 brelse(bh); 814 goto unlock; 815 } 816 num_entries++; 817 brelse(bh); 818 819 exfat_set_volume_dirty(sb); 820 /* update the directory entry */ 821 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { 822 err = -EIO; 823 goto unlock; 824 } 825 826 /* This doesn't modify ei */ 827 ei->dir.dir = DIR_DELETED; 828 829 inode_inc_iversion(dir); 830 dir->i_mtime = dir->i_atime = inode_set_ctime_current(dir); 831 exfat_truncate_atime(&dir->i_atime); 832 if (IS_DIRSYNC(dir)) 833 exfat_sync_inode(dir); 834 else 835 mark_inode_dirty(dir); 836 837 clear_nlink(inode); 838 inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode); 839 exfat_truncate_atime(&inode->i_atime); 840 exfat_unhash_inode(inode); 841 exfat_d_version_set(dentry, inode_query_iversion(dir)); 842unlock: 843 mutex_unlock(&EXFAT_SB(sb)->s_lock); 844 return err; 845} 846 847static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, 848 struct dentry *dentry, umode_t mode) 849{ 850 struct super_block *sb = dir->i_sb; 851 struct inode *inode; 852 struct exfat_dir_entry info; 853 struct exfat_chain cdir; 854 loff_t i_pos; 855 int err; 856 857 mutex_lock(&EXFAT_SB(sb)->s_lock); 858 exfat_set_volume_dirty(sb); 859 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, 860 &info); 861 if (err) 862 goto unlock; 863 864 inode_inc_iversion(dir); 865 dir->i_mtime = inode_set_ctime_current(dir); 866 if (IS_DIRSYNC(dir)) 867 exfat_sync_inode(dir); 868 else 869 mark_inode_dirty(dir); 870 inc_nlink(dir); 871 872 i_pos = exfat_make_i_pos(&info); 873 inode = exfat_build_inode(sb, &info, i_pos); 874 err = PTR_ERR_OR_ZERO(inode); 875 if (err) 876 goto unlock; 877 878 inode_inc_iversion(inode); 879 inode->i_mtime = inode->i_atime = EXFAT_I(inode)->i_crtime = inode_set_ctime_current(inode); 880 exfat_truncate_atime(&inode->i_atime); 881 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 882 883 d_instantiate(dentry, inode); 884 885unlock: 886 mutex_unlock(&EXFAT_SB(sb)->s_lock); 887 return err; 888} 889 890static int exfat_check_dir_empty(struct super_block *sb, 891 struct exfat_chain *p_dir) 892{ 893 int i, dentries_per_clu; 894 unsigned int type; 895 struct exfat_chain clu; 896 struct exfat_dentry *ep; 897 struct exfat_sb_info *sbi = EXFAT_SB(sb); 898 struct buffer_head *bh; 899 900 dentries_per_clu = sbi->dentries_per_clu; 901 902 if (p_dir->dir == EXFAT_EOF_CLUSTER) 903 return 0; 904 905 exfat_chain_dup(&clu, p_dir); 906 907 while (clu.dir != EXFAT_EOF_CLUSTER) { 908 for (i = 0; i < dentries_per_clu; i++) { 909 ep = exfat_get_dentry(sb, &clu, i, &bh); 910 if (!ep) 911 return -EIO; 912 type = exfat_get_entry_type(ep); 913 brelse(bh); 914 if (type == TYPE_UNUSED) 915 return 0; 916 917 if (type != TYPE_FILE && type != TYPE_DIR) 918 continue; 919 920 return -ENOTEMPTY; 921 } 922 923 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 924 if (--clu.size > 0) 925 clu.dir++; 926 else 927 clu.dir = EXFAT_EOF_CLUSTER; 928 } else { 929 if (exfat_get_next_cluster(sb, &(clu.dir))) 930 return -EIO; 931 } 932 } 933 934 return 0; 935} 936 937static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 938{ 939 struct inode *inode = dentry->d_inode; 940 struct exfat_dentry *ep; 941 struct exfat_chain cdir, clu_to_free; 942 struct super_block *sb = inode->i_sb; 943 struct exfat_sb_info *sbi = EXFAT_SB(sb); 944 struct exfat_inode_info *ei = EXFAT_I(inode); 945 struct buffer_head *bh; 946 int num_entries, entry, err; 947 948 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 949 950 exfat_chain_dup(&cdir, &ei->dir); 951 entry = ei->entry; 952 953 if (ei->dir.dir == DIR_DELETED) { 954 exfat_err(sb, "abnormal access to deleted dentry"); 955 err = -ENOENT; 956 goto unlock; 957 } 958 959 exfat_chain_set(&clu_to_free, ei->start_clu, 960 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); 961 962 err = exfat_check_dir_empty(sb, &clu_to_free); 963 if (err) { 964 if (err == -EIO) 965 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 966 err); 967 goto unlock; 968 } 969 970 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 971 if (!ep) { 972 err = -EIO; 973 goto unlock; 974 } 975 976 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 977 if (num_entries < 0) { 978 err = -EIO; 979 brelse(bh); 980 goto unlock; 981 } 982 num_entries++; 983 brelse(bh); 984 985 exfat_set_volume_dirty(sb); 986 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); 987 if (err) { 988 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); 989 goto unlock; 990 } 991 ei->dir.dir = DIR_DELETED; 992 993 inode_inc_iversion(dir); 994 dir->i_mtime = dir->i_atime = inode_set_ctime_current(dir); 995 exfat_truncate_atime(&dir->i_atime); 996 if (IS_DIRSYNC(dir)) 997 exfat_sync_inode(dir); 998 else 999 mark_inode_dirty(dir); 1000 drop_nlink(dir); 1001 1002 clear_nlink(inode); 1003 inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode); 1004 exfat_truncate_atime(&inode->i_atime); 1005 exfat_unhash_inode(inode); 1006 exfat_d_version_set(dentry, inode_query_iversion(dir)); 1007unlock: 1008 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 1009 return err; 1010} 1011 1012static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, 1013 int oldentry, struct exfat_uni_name *p_uniname, 1014 struct exfat_inode_info *ei) 1015{ 1016 int ret, num_old_entries, num_new_entries; 1017 struct exfat_dentry *epold, *epnew; 1018 struct super_block *sb = inode->i_sb; 1019 struct buffer_head *new_bh, *old_bh; 1020 int sync = IS_DIRSYNC(inode); 1021 1022 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh); 1023 if (!epold) 1024 return -EIO; 1025 1026 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); 1027 if (num_old_entries < 0) 1028 return -EIO; 1029 num_old_entries++; 1030 1031 num_new_entries = exfat_calc_num_entries(p_uniname); 1032 if (num_new_entries < 0) 1033 return num_new_entries; 1034 1035 if (num_old_entries < num_new_entries) { 1036 int newentry; 1037 1038 newentry = 1039 exfat_find_empty_entry(inode, p_dir, num_new_entries); 1040 if (newentry < 0) 1041 return newentry; /* -EIO or -ENOSPC */ 1042 1043 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh); 1044 if (!epnew) 1045 return -EIO; 1046 1047 *epnew = *epold; 1048 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1049 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1050 ei->attr |= ATTR_ARCHIVE; 1051 } 1052 exfat_update_bh(new_bh, sync); 1053 brelse(old_bh); 1054 brelse(new_bh); 1055 1056 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh); 1057 if (!epold) 1058 return -EIO; 1059 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); 1060 if (!epnew) { 1061 brelse(old_bh); 1062 return -EIO; 1063 } 1064 1065 *epnew = *epold; 1066 exfat_update_bh(new_bh, sync); 1067 brelse(old_bh); 1068 brelse(new_bh); 1069 1070 ret = exfat_init_ext_entry(inode, p_dir, newentry, 1071 num_new_entries, p_uniname); 1072 if (ret) 1073 return ret; 1074 1075 exfat_remove_entries(inode, p_dir, oldentry, 0, 1076 num_old_entries); 1077 ei->dir = *p_dir; 1078 ei->entry = newentry; 1079 } else { 1080 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1081 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1082 ei->attr |= ATTR_ARCHIVE; 1083 } 1084 exfat_update_bh(old_bh, sync); 1085 brelse(old_bh); 1086 ret = exfat_init_ext_entry(inode, p_dir, oldentry, 1087 num_new_entries, p_uniname); 1088 if (ret) 1089 return ret; 1090 1091 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries, 1092 num_old_entries); 1093 } 1094 return 0; 1095} 1096 1097static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, 1098 int oldentry, struct exfat_chain *p_newdir, 1099 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1100{ 1101 int ret, newentry, num_new_entries, num_old_entries; 1102 struct exfat_dentry *epmov, *epnew; 1103 struct super_block *sb = inode->i_sb; 1104 struct buffer_head *mov_bh, *new_bh; 1105 1106 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh); 1107 if (!epmov) 1108 return -EIO; 1109 1110 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, 1111 epmov); 1112 if (num_old_entries < 0) 1113 return -EIO; 1114 num_old_entries++; 1115 1116 num_new_entries = exfat_calc_num_entries(p_uniname); 1117 if (num_new_entries < 0) 1118 return num_new_entries; 1119 1120 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); 1121 if (newentry < 0) 1122 return newentry; /* -EIO or -ENOSPC */ 1123 1124 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh); 1125 if (!epnew) 1126 return -EIO; 1127 1128 *epnew = *epmov; 1129 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1130 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1131 ei->attr |= ATTR_ARCHIVE; 1132 } 1133 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1134 brelse(mov_bh); 1135 brelse(new_bh); 1136 1137 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh); 1138 if (!epmov) 1139 return -EIO; 1140 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); 1141 if (!epnew) { 1142 brelse(mov_bh); 1143 return -EIO; 1144 } 1145 1146 *epnew = *epmov; 1147 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1148 brelse(mov_bh); 1149 brelse(new_bh); 1150 1151 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, 1152 p_uniname); 1153 if (ret) 1154 return ret; 1155 1156 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); 1157 1158 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, 1159 p_newdir->flags); 1160 1161 ei->entry = newentry; 1162 return 0; 1163} 1164 1165/* rename or move a old file into a new file */ 1166static int __exfat_rename(struct inode *old_parent_inode, 1167 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1168 struct dentry *new_dentry) 1169{ 1170 int ret; 1171 int dentry; 1172 struct exfat_chain olddir, newdir; 1173 struct exfat_chain *p_dir = NULL; 1174 struct exfat_uni_name uni_name; 1175 struct exfat_dentry *ep; 1176 struct super_block *sb = old_parent_inode->i_sb; 1177 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1178 const unsigned char *new_path = new_dentry->d_name.name; 1179 struct inode *new_inode = new_dentry->d_inode; 1180 int num_entries; 1181 struct exfat_inode_info *new_ei = NULL; 1182 unsigned int new_entry_type = TYPE_UNUSED; 1183 int new_entry = 0; 1184 struct buffer_head *new_bh = NULL; 1185 1186 /* check the validity of pointer parameters */ 1187 if (new_path == NULL || strlen(new_path) == 0) 1188 return -EINVAL; 1189 1190 if (ei->dir.dir == DIR_DELETED) { 1191 exfat_err(sb, "abnormal access to deleted source dentry"); 1192 return -ENOENT; 1193 } 1194 1195 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, 1196 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), 1197 EXFAT_I(old_parent_inode)->flags); 1198 dentry = ei->entry; 1199 1200 /* check whether new dir is existing directory and empty */ 1201 if (new_inode) { 1202 ret = -EIO; 1203 new_ei = EXFAT_I(new_inode); 1204 1205 if (new_ei->dir.dir == DIR_DELETED) { 1206 exfat_err(sb, "abnormal access to deleted target dentry"); 1207 goto out; 1208 } 1209 1210 p_dir = &(new_ei->dir); 1211 new_entry = new_ei->entry; 1212 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1213 if (!ep) 1214 goto out; 1215 1216 new_entry_type = exfat_get_entry_type(ep); 1217 brelse(new_bh); 1218 1219 /* if new_inode exists, update ei */ 1220 if (new_entry_type == TYPE_DIR) { 1221 struct exfat_chain new_clu; 1222 1223 new_clu.dir = new_ei->start_clu; 1224 new_clu.size = 1225 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1226 sbi); 1227 new_clu.flags = new_ei->flags; 1228 1229 ret = exfat_check_dir_empty(sb, &new_clu); 1230 if (ret) 1231 goto out; 1232 } 1233 } 1234 1235 /* check the validity of directory name in the given new pathname */ 1236 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, 1237 &uni_name); 1238 if (ret) 1239 goto out; 1240 1241 exfat_set_volume_dirty(sb); 1242 1243 if (olddir.dir == newdir.dir) 1244 ret = exfat_rename_file(new_parent_inode, &olddir, dentry, 1245 &uni_name, ei); 1246 else 1247 ret = exfat_move_file(new_parent_inode, &olddir, dentry, 1248 &newdir, &uni_name, ei); 1249 1250 if (!ret && new_inode) { 1251 /* delete entries of new_dir */ 1252 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1253 if (!ep) { 1254 ret = -EIO; 1255 goto del_out; 1256 } 1257 1258 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); 1259 if (num_entries < 0) { 1260 ret = -EIO; 1261 goto del_out; 1262 } 1263 brelse(new_bh); 1264 1265 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, 1266 num_entries + 1)) { 1267 ret = -EIO; 1268 goto del_out; 1269 } 1270 1271 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1272 if (new_entry_type == TYPE_DIR && 1273 new_ei->start_clu != EXFAT_EOF_CLUSTER) { 1274 /* new_ei, new_clu_to_free */ 1275 struct exfat_chain new_clu_to_free; 1276 1277 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1278 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1279 sbi), new_ei->flags); 1280 1281 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1282 /* just set I/O error only */ 1283 ret = -EIO; 1284 } 1285 1286 i_size_write(new_inode, 0); 1287 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1288 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1289 } 1290del_out: 1291 /* Update new_inode ei 1292 * Prevent syncing removed new_inode 1293 * (new_ei is already initialized above code ("if (new_inode)") 1294 */ 1295 new_ei->dir.dir = DIR_DELETED; 1296 } 1297out: 1298 return ret; 1299} 1300 1301static int exfat_rename(struct mnt_idmap *idmap, 1302 struct inode *old_dir, struct dentry *old_dentry, 1303 struct inode *new_dir, struct dentry *new_dentry, 1304 unsigned int flags) 1305{ 1306 struct inode *old_inode, *new_inode; 1307 struct super_block *sb = old_dir->i_sb; 1308 loff_t i_pos; 1309 int err; 1310 1311 /* 1312 * The VFS already checks for existence, so for local filesystems 1313 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1314 * Don't support any other flags 1315 */ 1316 if (flags & ~RENAME_NOREPLACE) 1317 return -EINVAL; 1318 1319 mutex_lock(&EXFAT_SB(sb)->s_lock); 1320 old_inode = old_dentry->d_inode; 1321 new_inode = new_dentry->d_inode; 1322 1323 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1324 if (err) 1325 goto unlock; 1326 1327 inode_inc_iversion(new_dir); 1328 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); 1329 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1330 exfat_truncate_atime(&new_dir->i_atime); 1331 if (IS_DIRSYNC(new_dir)) 1332 exfat_sync_inode(new_dir); 1333 else 1334 mark_inode_dirty(new_dir); 1335 1336 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1337 (EXFAT_I(old_inode)->entry & 0xffffffff); 1338 exfat_unhash_inode(old_inode); 1339 exfat_hash_inode(old_inode, i_pos); 1340 if (IS_DIRSYNC(new_dir)) 1341 exfat_sync_inode(old_inode); 1342 else 1343 mark_inode_dirty(old_inode); 1344 1345 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1346 drop_nlink(old_dir); 1347 if (!new_inode) 1348 inc_nlink(new_dir); 1349 } 1350 1351 inode_inc_iversion(old_dir); 1352 if (IS_DIRSYNC(old_dir)) 1353 exfat_sync_inode(old_dir); 1354 else 1355 mark_inode_dirty(old_dir); 1356 1357 if (new_inode) { 1358 exfat_unhash_inode(new_inode); 1359 1360 /* skip drop_nlink if new_inode already has been dropped */ 1361 if (new_inode->i_nlink) { 1362 drop_nlink(new_inode); 1363 if (S_ISDIR(new_inode->i_mode)) 1364 drop_nlink(new_inode); 1365 } else { 1366 exfat_warn(sb, "abnormal access to an inode dropped"); 1367 WARN_ON(new_inode->i_nlink == 0); 1368 } 1369 EXFAT_I(new_inode)->i_crtime = current_time(new_inode); 1370 } 1371 1372unlock: 1373 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1374 return err; 1375} 1376 1377const struct inode_operations exfat_dir_inode_operations = { 1378 .create = exfat_create, 1379 .lookup = exfat_lookup, 1380 .unlink = exfat_unlink, 1381 .mkdir = exfat_mkdir, 1382 .rmdir = exfat_rmdir, 1383 .rename = exfat_rename, 1384 .setattr = exfat_setattr, 1385 .getattr = exfat_getattr, 1386}; 1387