1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. 4 */ 5 6 #include <linux/iversion.h> 7 #include <linux/namei.h> 8 #include <linux/slab.h> 9 #include <linux/buffer_head.h> 10 #include <linux/nls.h> 11 12 #include "exfat_raw.h" 13 #include "exfat_fs.h" 14 15 static inline unsigned long exfat_d_version(struct dentry *dentry) 16 { 17 return (unsigned long) dentry->d_fsdata; 18 } 19 20 static inline void exfat_d_version_set(struct dentry *dentry, 21 unsigned long version) 22 { 23 dentry->d_fsdata = (void *) version; 24 } 25 26 /* 27 * If new entry was created in the parent, it could create the 8.3 alias (the 28 * shortname of logname). So, the parent may have the negative-dentry which 29 * matches the created 8.3 alias. 30 * 31 * If it happened, the negative dentry isn't actually negative anymore. So, 32 * drop it. 33 */ 34 static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags) 35 { 36 int ret; 37 38 if (flags & LOOKUP_RCU) 39 return -ECHILD; 40 41 /* 42 * This is not negative dentry. Always valid. 43 * 44 * Note, rename() to existing directory entry will have ->d_inode, and 45 * will use existing name which isn't specified name by user. 46 * 47 * We may be able to drop this positive dentry here. But dropping 48 * positive dentry isn't good idea. So it's unsupported like 49 * rename("filename", "FILENAME") for now. 50 */ 51 if (d_really_is_positive(dentry)) 52 return 1; 53 54 /* 55 * Drop the negative dentry, in order to make sure to use the case 56 * sensitive name which is specified by user if this is for creation. 57 */ 58 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 59 return 0; 60 61 spin_lock(&dentry->d_lock); 62 ret = inode_eq_iversion(d_inode(dentry->d_parent), 63 exfat_d_version(dentry)); 64 spin_unlock(&dentry->d_lock); 65 return ret; 66 } 67 68 /* returns the length of a struct qstr, ignoring trailing dots if necessary */ 69 static unsigned int exfat_striptail_len(unsigned int len, const char *name, 70 bool keep_last_dots) 71 { 72 if (!keep_last_dots) { 73 while (len && name[len - 1] == '.') 74 len--; 75 } 76 return len; 77 } 78 79 /* 80 * Compute the hash for the exfat name corresponding to the dentry. If the name 81 * is invalid, we leave the hash code unchanged so that the existing dentry can 82 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate. 83 */ 84 static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) 85 { 86 struct super_block *sb = dentry->d_sb; 87 struct nls_table *t = EXFAT_SB(sb)->nls_io; 88 const unsigned char *name = qstr->name; 89 unsigned int len = exfat_striptail_len(qstr->len, qstr->name, 90 EXFAT_SB(sb)->options.keep_last_dots); 91 unsigned long hash = init_name_hash(dentry); 92 int i, charlen; 93 wchar_t c; 94 95 for (i = 0; i < len; i += charlen) { 96 charlen = t->char2uni(&name[i], len - i, &c); 97 if (charlen < 0) 98 return charlen; 99 hash = partial_name_hash(exfat_toupper(sb, c), hash); 100 } 101 102 qstr->hash = end_name_hash(hash); 103 return 0; 104 } 105 106 static int exfat_d_cmp(const struct dentry *dentry, unsigned int len, 107 const char *str, const struct qstr *name) 108 { 109 struct super_block *sb = dentry->d_sb; 110 struct nls_table *t = EXFAT_SB(sb)->nls_io; 111 unsigned int alen = exfat_striptail_len(name->len, name->name, 112 EXFAT_SB(sb)->options.keep_last_dots); 113 unsigned int blen = exfat_striptail_len(len, str, 114 EXFAT_SB(sb)->options.keep_last_dots); 115 wchar_t c1, c2; 116 int charlen, i; 117 118 if (alen != blen) 119 return 1; 120 121 for (i = 0; i < len; i += charlen) { 122 charlen = t->char2uni(&name->name[i], alen - i, &c1); 123 if (charlen < 0) 124 return 1; 125 if (charlen != t->char2uni(&str[i], blen - i, &c2)) 126 return 1; 127 128 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2)) 129 return 1; 130 } 131 132 return 0; 133 } 134 135 const struct dentry_operations exfat_dentry_ops = { 136 .d_revalidate = exfat_d_revalidate, 137 .d_hash = exfat_d_hash, 138 .d_compare = exfat_d_cmp, 139 }; 140 141 static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr) 142 { 143 struct super_block *sb = dentry->d_sb; 144 const unsigned char *name = qstr->name; 145 unsigned int len = exfat_striptail_len(qstr->len, qstr->name, 146 EXFAT_SB(sb)->options.keep_last_dots); 147 unsigned long hash = init_name_hash(dentry); 148 int i, charlen; 149 unicode_t u; 150 151 for (i = 0; i < len; i += charlen) { 152 charlen = utf8_to_utf32(&name[i], len - i, &u); 153 if (charlen < 0) 154 return charlen; 155 156 /* 157 * exfat_toupper() works only for code points up to the U+FFFF. 158 */ 159 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u, 160 hash); 161 } 162 163 qstr->hash = end_name_hash(hash); 164 return 0; 165 } 166 167 static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len, 168 const char *str, const struct qstr *name) 169 { 170 struct super_block *sb = dentry->d_sb; 171 unsigned int alen = exfat_striptail_len(name->len, name->name, 172 EXFAT_SB(sb)->options.keep_last_dots); 173 unsigned int blen = exfat_striptail_len(len, str, 174 EXFAT_SB(sb)->options.keep_last_dots); 175 176 unicode_t u_a, u_b; 177 int charlen, i; 178 179 if (alen != blen) 180 return 1; 181 182 for (i = 0; i < alen; i += charlen) { 183 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a); 184 if (charlen < 0) 185 return 1; 186 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b)) 187 return 1; 188 189 if (u_a <= 0xFFFF && u_b <= 0xFFFF) { 190 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b)) 191 return 1; 192 } else { 193 if (u_a != u_b) 194 return 1; 195 } 196 } 197 198 return 0; 199 } 200 201 const struct dentry_operations exfat_utf8_dentry_ops = { 202 .d_revalidate = exfat_d_revalidate, 203 .d_hash = exfat_utf8_d_hash, 204 .d_compare = exfat_utf8_d_cmp, 205 }; 206 207 /* used only in search empty_slot() */ 208 #define CNT_UNUSED_NOHIT (-1) 209 #define CNT_UNUSED_HIT (-2) 210 /* search EMPTY CONTINUOUS "num_entries" entries */ 211 static int exfat_search_empty_slot(struct super_block *sb, 212 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir, 213 int num_entries) 214 { 215 int i, dentry, num_empty = 0; 216 int dentries_per_clu; 217 unsigned int type; 218 struct exfat_chain clu; 219 struct exfat_dentry *ep; 220 struct exfat_sb_info *sbi = EXFAT_SB(sb); 221 struct buffer_head *bh; 222 223 dentries_per_clu = sbi->dentries_per_clu; 224 225 if (hint_femp->eidx != EXFAT_HINT_NONE) { 226 dentry = hint_femp->eidx; 227 if (num_entries <= hint_femp->count) { 228 hint_femp->eidx = EXFAT_HINT_NONE; 229 return dentry; 230 } 231 232 exfat_chain_dup(&clu, &hint_femp->cur); 233 } else { 234 exfat_chain_dup(&clu, p_dir); 235 dentry = 0; 236 } 237 238 while (clu.dir != EXFAT_EOF_CLUSTER) { 239 i = dentry & (dentries_per_clu - 1); 240 241 for (; i < dentries_per_clu; i++, dentry++) { 242 ep = exfat_get_dentry(sb, &clu, i, &bh); 243 if (!ep) 244 return -EIO; 245 type = exfat_get_entry_type(ep); 246 brelse(bh); 247 248 if (type == TYPE_UNUSED || type == TYPE_DELETED) { 249 num_empty++; 250 if (hint_femp->eidx == EXFAT_HINT_NONE) { 251 hint_femp->eidx = dentry; 252 hint_femp->count = CNT_UNUSED_NOHIT; 253 exfat_chain_set(&hint_femp->cur, 254 clu.dir, clu.size, clu.flags); 255 } 256 257 if (type == TYPE_UNUSED && 258 hint_femp->count != CNT_UNUSED_HIT) 259 hint_femp->count = CNT_UNUSED_HIT; 260 } else { 261 if (hint_femp->eidx != EXFAT_HINT_NONE && 262 hint_femp->count == CNT_UNUSED_HIT) { 263 /* unused empty group means 264 * an empty group which includes 265 * unused dentry 266 */ 267 exfat_fs_error(sb, 268 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)", 269 dentry, hint_femp->eidx, 270 p_dir->dir, clu.dir); 271 return -EIO; 272 } 273 274 num_empty = 0; 275 hint_femp->eidx = EXFAT_HINT_NONE; 276 } 277 278 if (num_empty >= num_entries) { 279 /* found and invalidate hint_femp */ 280 hint_femp->eidx = EXFAT_HINT_NONE; 281 return (dentry - (num_entries - 1)); 282 } 283 } 284 285 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 286 if (--clu.size > 0) 287 clu.dir++; 288 else 289 clu.dir = EXFAT_EOF_CLUSTER; 290 } else { 291 if (exfat_get_next_cluster(sb, &clu.dir)) 292 return -EIO; 293 } 294 } 295 296 return -ENOSPC; 297 } 298 299 static int exfat_check_max_dentries(struct inode *inode) 300 { 301 if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) { 302 /* 303 * exFAT spec allows a dir to grow up to 8388608(256MB) 304 * dentries 305 */ 306 return -ENOSPC; 307 } 308 return 0; 309 } 310 311 /* find empty directory entry. 312 * if there isn't any empty slot, expand cluster chain. 313 */ 314 static int exfat_find_empty_entry(struct inode *inode, 315 struct exfat_chain *p_dir, int num_entries) 316 { 317 int dentry; 318 unsigned int ret, last_clu; 319 loff_t size = 0; 320 struct exfat_chain clu; 321 struct exfat_dentry *ep = NULL; 322 struct super_block *sb = inode->i_sb; 323 struct exfat_sb_info *sbi = EXFAT_SB(sb); 324 struct exfat_inode_info *ei = EXFAT_I(inode); 325 struct exfat_hint_femp hint_femp; 326 327 hint_femp.eidx = EXFAT_HINT_NONE; 328 329 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { 330 hint_femp = ei->hint_femp; 331 ei->hint_femp.eidx = EXFAT_HINT_NONE; 332 } 333 334 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir, 335 num_entries)) < 0) { 336 if (dentry == -EIO) 337 break; 338 339 if (exfat_check_max_dentries(inode)) 340 return -ENOSPC; 341 342 /* we trust p_dir->size regardless of FAT type */ 343 if (exfat_find_last_cluster(sb, p_dir, &last_clu)) 344 return -EIO; 345 346 /* 347 * Allocate new cluster to this directory 348 */ 349 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); 350 351 /* allocate a cluster */ 352 ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode)); 353 if (ret) 354 return ret; 355 356 if (exfat_zeroed_cluster(inode, clu.dir)) 357 return -EIO; 358 359 /* append to the FAT chain */ 360 if (clu.flags != p_dir->flags) { 361 /* no-fat-chain bit is disabled, 362 * so fat-chain should be synced with alloc-bitmap 363 */ 364 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); 365 p_dir->flags = ALLOC_FAT_CHAIN; 366 hint_femp.cur.flags = ALLOC_FAT_CHAIN; 367 } 368 369 if (clu.flags == ALLOC_FAT_CHAIN) 370 if (exfat_ent_set(sb, last_clu, clu.dir)) 371 return -EIO; 372 373 if (hint_femp.eidx == EXFAT_HINT_NONE) { 374 /* the special case that new dentry 375 * should be allocated from the start of new cluster 376 */ 377 hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi); 378 hint_femp.count = sbi->dentries_per_clu; 379 380 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); 381 } 382 hint_femp.cur.size++; 383 p_dir->size++; 384 size = EXFAT_CLU_TO_B(p_dir->size, sbi); 385 386 /* update the directory entry */ 387 if (p_dir->dir != sbi->root_dir) { 388 struct buffer_head *bh; 389 390 ep = exfat_get_dentry(sb, 391 &(ei->dir), ei->entry + 1, &bh); 392 if (!ep) 393 return -EIO; 394 395 ep->dentry.stream.valid_size = cpu_to_le64(size); 396 ep->dentry.stream.size = ep->dentry.stream.valid_size; 397 ep->dentry.stream.flags = p_dir->flags; 398 exfat_update_bh(bh, IS_DIRSYNC(inode)); 399 brelse(bh); 400 if (exfat_update_dir_chksum(inode, &(ei->dir), 401 ei->entry)) 402 return -EIO; 403 } 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 += 1 << sbi->sect_per_clus_bits; 411 } 412 413 return dentry; 414 } 415 416 /* 417 * Name Resolution Functions : 418 * Zero if it was successful; otherwise nonzero. 419 */ 420 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, 421 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 422 int lookup) 423 { 424 int namelen; 425 int lossy = NLS_NAME_NO_LOSSY; 426 struct super_block *sb = inode->i_sb; 427 struct exfat_sb_info *sbi = EXFAT_SB(sb); 428 struct exfat_inode_info *ei = EXFAT_I(inode); 429 int pathlen = strlen(path); 430 431 /* 432 * get the length of the pathname excluding 433 * trailing periods, if any. 434 */ 435 namelen = exfat_striptail_len(pathlen, path, false); 436 if (EXFAT_SB(sb)->options.keep_last_dots) { 437 /* 438 * Do not allow the creation of files with names 439 * ending with period(s). 440 */ 441 if (!lookup && (namelen < pathlen)) 442 return -EINVAL; 443 namelen = pathlen; 444 } 445 if (!namelen) 446 return -ENOENT; 447 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) 448 return -ENAMETOOLONG; 449 450 /* 451 * strip all leading spaces : 452 * "MS windows 7" supports leading spaces. 453 * So we should skip this preprocessing for compatibility. 454 */ 455 456 /* file name conversion : 457 * If lookup case, we allow bad-name for compatibility. 458 */ 459 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, 460 &lossy); 461 if (namelen < 0) 462 return namelen; /* return error value */ 463 464 if ((lossy && !lookup) || !namelen) 465 return -EINVAL; 466 467 exfat_chain_set(p_dir, ei->start_clu, 468 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); 469 470 return 0; 471 } 472 473 static inline int exfat_resolve_path(struct inode *inode, 474 const unsigned char *path, struct exfat_chain *dir, 475 struct exfat_uni_name *uni) 476 { 477 return __exfat_resolve_path(inode, path, dir, uni, 0); 478 } 479 480 static inline int exfat_resolve_path_for_lookup(struct inode *inode, 481 const unsigned char *path, struct exfat_chain *dir, 482 struct exfat_uni_name *uni) 483 { 484 return __exfat_resolve_path(inode, path, dir, uni, 1); 485 } 486 487 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) 488 { 489 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); 490 } 491 492 static int exfat_add_entry(struct inode *inode, const char *path, 493 struct exfat_chain *p_dir, unsigned int type, 494 struct exfat_dir_entry *info) 495 { 496 int ret, dentry, num_entries; 497 struct super_block *sb = inode->i_sb; 498 struct exfat_sb_info *sbi = EXFAT_SB(sb); 499 struct exfat_uni_name uniname; 500 struct exfat_chain clu; 501 int clu_size = 0; 502 unsigned int start_clu = EXFAT_FREE_CLUSTER; 503 504 ret = exfat_resolve_path(inode, path, p_dir, &uniname); 505 if (ret) 506 goto out; 507 508 num_entries = exfat_calc_num_entries(&uniname); 509 if (num_entries < 0) { 510 ret = num_entries; 511 goto out; 512 } 513 514 /* exfat_find_empty_entry must be called before alloc_cluster() */ 515 dentry = exfat_find_empty_entry(inode, p_dir, num_entries); 516 if (dentry < 0) { 517 ret = dentry; /* -EIO or -ENOSPC */ 518 goto out; 519 } 520 521 if (type == TYPE_DIR) { 522 ret = exfat_alloc_new_dir(inode, &clu); 523 if (ret) 524 goto out; 525 start_clu = clu.dir; 526 clu_size = sbi->cluster_size; 527 } 528 529 /* update the directory entry */ 530 /* fill the dos name directory entry information of the created file. 531 * the first cluster is not determined yet. (0) 532 */ 533 ret = exfat_init_dir_entry(inode, p_dir, dentry, type, 534 start_clu, clu_size); 535 if (ret) 536 goto out; 537 538 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); 539 if (ret) 540 goto out; 541 542 info->dir = *p_dir; 543 info->entry = dentry; 544 info->flags = ALLOC_NO_FAT_CHAIN; 545 info->type = type; 546 547 if (type == TYPE_FILE) { 548 info->attr = ATTR_ARCHIVE; 549 info->start_clu = EXFAT_EOF_CLUSTER; 550 info->size = 0; 551 info->num_subdirs = 0; 552 } else { 553 info->attr = ATTR_SUBDIR; 554 info->start_clu = start_clu; 555 info->size = clu_size; 556 info->num_subdirs = EXFAT_MIN_SUBDIR; 557 } 558 memset(&info->crtime, 0, sizeof(info->crtime)); 559 memset(&info->mtime, 0, sizeof(info->mtime)); 560 memset(&info->atime, 0, sizeof(info->atime)); 561 out: 562 return ret; 563 } 564 565 static int exfat_create(struct user_namespace *mnt_userns, 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_ctime = dir->i_mtime = current_time(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 = inode->i_ctime = 597 EXFAT_I(inode)->i_crtime = current_time(inode); 598 exfat_truncate_atime(&inode->i_atime); 599 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 600 601 d_instantiate(dentry, inode); 602 unlock: 603 mutex_unlock(&EXFAT_SB(sb)->s_lock); 604 return err; 605 } 606 607 /* lookup a file */ 608 static int exfat_find(struct inode *dir, struct qstr *qname, 609 struct exfat_dir_entry *info) 610 { 611 int ret, dentry, num_entries, count; 612 struct exfat_chain cdir; 613 struct exfat_uni_name uni_name; 614 struct super_block *sb = dir->i_sb; 615 struct exfat_sb_info *sbi = EXFAT_SB(sb); 616 struct exfat_inode_info *ei = EXFAT_I(dir); 617 struct exfat_dentry *ep, *ep2; 618 struct exfat_entry_set_cache *es; 619 /* for optimized dir & entry to prevent long traverse of cluster chain */ 620 struct exfat_hint hint_opt; 621 622 if (qname->len == 0) 623 return -ENOENT; 624 625 /* check the validity of directory name in the given pathname */ 626 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); 627 if (ret) 628 return ret; 629 630 num_entries = exfat_calc_num_entries(&uni_name); 631 if (num_entries < 0) 632 return num_entries; 633 634 /* check the validation of hint_stat and initialize it if required */ 635 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 636 ei->hint_stat.clu = cdir.dir; 637 ei->hint_stat.eidx = 0; 638 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 639 ei->hint_femp.eidx = EXFAT_HINT_NONE; 640 } 641 642 /* search the file name for directories */ 643 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, 644 num_entries, TYPE_ALL, &hint_opt); 645 646 if (dentry < 0) 647 return dentry; /* -error value */ 648 649 info->dir = cdir; 650 info->entry = dentry; 651 info->num_subdirs = 0; 652 653 /* adjust cdir to the optimized value */ 654 cdir.dir = hint_opt.clu; 655 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 656 cdir.size -= dentry / sbi->dentries_per_clu; 657 dentry = hint_opt.eidx; 658 es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES); 659 if (!es) 660 return -EIO; 661 ep = exfat_get_dentry_cached(es, 0); 662 ep2 = exfat_get_dentry_cached(es, 1); 663 664 info->type = exfat_get_entry_type(ep); 665 info->attr = le16_to_cpu(ep->dentry.file.attr); 666 info->size = le64_to_cpu(ep2->dentry.stream.valid_size); 667 if ((info->type == TYPE_FILE) && (info->size == 0)) { 668 info->flags = ALLOC_NO_FAT_CHAIN; 669 info->start_clu = EXFAT_EOF_CLUSTER; 670 } else { 671 info->flags = ep2->dentry.stream.flags; 672 info->start_clu = 673 le32_to_cpu(ep2->dentry.stream.start_clu); 674 } 675 676 exfat_get_entry_time(sbi, &info->crtime, 677 ep->dentry.file.create_tz, 678 ep->dentry.file.create_time, 679 ep->dentry.file.create_date, 680 ep->dentry.file.create_time_cs); 681 exfat_get_entry_time(sbi, &info->mtime, 682 ep->dentry.file.modify_tz, 683 ep->dentry.file.modify_time, 684 ep->dentry.file.modify_date, 685 ep->dentry.file.modify_time_cs); 686 exfat_get_entry_time(sbi, &info->atime, 687 ep->dentry.file.access_tz, 688 ep->dentry.file.access_time, 689 ep->dentry.file.access_date, 690 0); 691 exfat_free_dentry_set(es, false); 692 693 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 694 exfat_fs_error(sb, 695 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 696 i_size_read(dir), ei->dir.dir, ei->entry); 697 return -EIO; 698 } 699 700 if (info->type == TYPE_DIR) { 701 exfat_chain_set(&cdir, info->start_clu, 702 EXFAT_B_TO_CLU(info->size, sbi), info->flags); 703 count = exfat_count_dir_entries(sb, &cdir); 704 if (count < 0) 705 return -EIO; 706 707 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 708 } 709 return 0; 710 } 711 712 static int exfat_d_anon_disconn(struct dentry *dentry) 713 { 714 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); 715 } 716 717 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 718 unsigned int flags) 719 { 720 struct super_block *sb = dir->i_sb; 721 struct inode *inode; 722 struct dentry *alias; 723 struct exfat_dir_entry info; 724 int err; 725 loff_t i_pos; 726 mode_t i_mode; 727 728 mutex_lock(&EXFAT_SB(sb)->s_lock); 729 err = exfat_find(dir, &dentry->d_name, &info); 730 if (err) { 731 if (err == -ENOENT) { 732 inode = NULL; 733 goto out; 734 } 735 goto unlock; 736 } 737 738 i_pos = exfat_make_i_pos(&info); 739 inode = exfat_build_inode(sb, &info, i_pos); 740 err = PTR_ERR_OR_ZERO(inode); 741 if (err) 742 goto unlock; 743 744 i_mode = inode->i_mode; 745 alias = d_find_alias(inode); 746 747 /* 748 * Checking "alias->d_parent == dentry->d_parent" to make sure 749 * FS is not corrupted (especially double linked dir). 750 */ 751 if (alias && alias->d_parent == dentry->d_parent && 752 !exfat_d_anon_disconn(alias)) { 753 754 /* 755 * Unhashed alias is able to exist because of revalidate() 756 * called by lookup_fast. You can easily make this status 757 * by calling create and lookup concurrently 758 * In such case, we reuse an alias instead of new dentry 759 */ 760 if (d_unhashed(alias)) { 761 WARN_ON(alias->d_name.hash_len != 762 dentry->d_name.hash_len); 763 exfat_info(sb, "rehashed a dentry(%p) in read lookup", 764 alias); 765 d_drop(dentry); 766 d_rehash(alias); 767 } else if (!S_ISDIR(i_mode)) { 768 /* 769 * This inode has non anonymous-DCACHE_DISCONNECTED 770 * dentry. This means, the user did ->lookup() by an 771 * another name (longname vs 8.3 alias of it) in past. 772 * 773 * Switch to new one for reason of locality if possible. 774 */ 775 d_move(alias, dentry); 776 } 777 iput(inode); 778 mutex_unlock(&EXFAT_SB(sb)->s_lock); 779 return alias; 780 } 781 dput(alias); 782 out: 783 mutex_unlock(&EXFAT_SB(sb)->s_lock); 784 if (!inode) 785 exfat_d_version_set(dentry, inode_query_iversion(dir)); 786 787 return d_splice_alias(inode, dentry); 788 unlock: 789 mutex_unlock(&EXFAT_SB(sb)->s_lock); 790 return ERR_PTR(err); 791 } 792 793 /* remove an entry, BUT don't truncate */ 794 static int exfat_unlink(struct inode *dir, struct dentry *dentry) 795 { 796 struct exfat_chain cdir; 797 struct exfat_dentry *ep; 798 struct super_block *sb = dir->i_sb; 799 struct inode *inode = dentry->d_inode; 800 struct exfat_inode_info *ei = EXFAT_I(inode); 801 struct buffer_head *bh; 802 int num_entries, entry, err = 0; 803 804 mutex_lock(&EXFAT_SB(sb)->s_lock); 805 exfat_chain_dup(&cdir, &ei->dir); 806 entry = ei->entry; 807 if (ei->dir.dir == DIR_DELETED) { 808 exfat_err(sb, "abnormal access to deleted dentry"); 809 err = -ENOENT; 810 goto unlock; 811 } 812 813 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 814 if (!ep) { 815 err = -EIO; 816 goto unlock; 817 } 818 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 819 if (num_entries < 0) { 820 err = -EIO; 821 brelse(bh); 822 goto unlock; 823 } 824 num_entries++; 825 brelse(bh); 826 827 exfat_set_volume_dirty(sb); 828 /* update the directory entry */ 829 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { 830 err = -EIO; 831 goto unlock; 832 } 833 834 /* This doesn't modify ei */ 835 ei->dir.dir = DIR_DELETED; 836 837 inode_inc_iversion(dir); 838 dir->i_mtime = dir->i_atime = current_time(dir); 839 exfat_truncate_atime(&dir->i_atime); 840 if (IS_DIRSYNC(dir)) 841 exfat_sync_inode(dir); 842 else 843 mark_inode_dirty(dir); 844 845 clear_nlink(inode); 846 inode->i_mtime = inode->i_atime = current_time(inode); 847 exfat_truncate_atime(&inode->i_atime); 848 exfat_unhash_inode(inode); 849 exfat_d_version_set(dentry, inode_query_iversion(dir)); 850 unlock: 851 mutex_unlock(&EXFAT_SB(sb)->s_lock); 852 return err; 853 } 854 855 static int exfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 856 struct dentry *dentry, umode_t mode) 857 { 858 struct super_block *sb = dir->i_sb; 859 struct inode *inode; 860 struct exfat_dir_entry info; 861 struct exfat_chain cdir; 862 loff_t i_pos; 863 int err; 864 865 mutex_lock(&EXFAT_SB(sb)->s_lock); 866 exfat_set_volume_dirty(sb); 867 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, 868 &info); 869 if (err) 870 goto unlock; 871 872 inode_inc_iversion(dir); 873 dir->i_ctime = dir->i_mtime = current_time(dir); 874 if (IS_DIRSYNC(dir)) 875 exfat_sync_inode(dir); 876 else 877 mark_inode_dirty(dir); 878 inc_nlink(dir); 879 880 i_pos = exfat_make_i_pos(&info); 881 inode = exfat_build_inode(sb, &info, i_pos); 882 err = PTR_ERR_OR_ZERO(inode); 883 if (err) 884 goto unlock; 885 886 inode_inc_iversion(inode); 887 inode->i_mtime = inode->i_atime = inode->i_ctime = 888 EXFAT_I(inode)->i_crtime = current_time(inode); 889 exfat_truncate_atime(&inode->i_atime); 890 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 891 892 d_instantiate(dentry, inode); 893 894 unlock: 895 mutex_unlock(&EXFAT_SB(sb)->s_lock); 896 return err; 897 } 898 899 static int exfat_check_dir_empty(struct super_block *sb, 900 struct exfat_chain *p_dir) 901 { 902 int i, dentries_per_clu; 903 unsigned int type; 904 struct exfat_chain clu; 905 struct exfat_dentry *ep; 906 struct exfat_sb_info *sbi = EXFAT_SB(sb); 907 struct buffer_head *bh; 908 909 dentries_per_clu = sbi->dentries_per_clu; 910 911 exfat_chain_dup(&clu, p_dir); 912 913 while (clu.dir != EXFAT_EOF_CLUSTER) { 914 for (i = 0; i < dentries_per_clu; i++) { 915 ep = exfat_get_dentry(sb, &clu, i, &bh); 916 if (!ep) 917 return -EIO; 918 type = exfat_get_entry_type(ep); 919 brelse(bh); 920 if (type == TYPE_UNUSED) 921 return 0; 922 923 if (type != TYPE_FILE && type != TYPE_DIR) 924 continue; 925 926 return -ENOTEMPTY; 927 } 928 929 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 930 if (--clu.size > 0) 931 clu.dir++; 932 else 933 clu.dir = EXFAT_EOF_CLUSTER; 934 } else { 935 if (exfat_get_next_cluster(sb, &(clu.dir))) 936 return -EIO; 937 } 938 } 939 940 return 0; 941 } 942 943 static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 944 { 945 struct inode *inode = dentry->d_inode; 946 struct exfat_dentry *ep; 947 struct exfat_chain cdir, clu_to_free; 948 struct super_block *sb = inode->i_sb; 949 struct exfat_sb_info *sbi = EXFAT_SB(sb); 950 struct exfat_inode_info *ei = EXFAT_I(inode); 951 struct buffer_head *bh; 952 int num_entries, entry, err; 953 954 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 955 956 exfat_chain_dup(&cdir, &ei->dir); 957 entry = ei->entry; 958 959 if (ei->dir.dir == DIR_DELETED) { 960 exfat_err(sb, "abnormal access to deleted dentry"); 961 err = -ENOENT; 962 goto unlock; 963 } 964 965 exfat_chain_set(&clu_to_free, ei->start_clu, 966 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); 967 968 err = exfat_check_dir_empty(sb, &clu_to_free); 969 if (err) { 970 if (err == -EIO) 971 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 972 err); 973 goto unlock; 974 } 975 976 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 977 if (!ep) { 978 err = -EIO; 979 goto unlock; 980 } 981 982 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 983 if (num_entries < 0) { 984 err = -EIO; 985 brelse(bh); 986 goto unlock; 987 } 988 num_entries++; 989 brelse(bh); 990 991 exfat_set_volume_dirty(sb); 992 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); 993 if (err) { 994 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); 995 goto unlock; 996 } 997 ei->dir.dir = DIR_DELETED; 998 999 inode_inc_iversion(dir); 1000 dir->i_mtime = dir->i_atime = current_time(dir); 1001 exfat_truncate_atime(&dir->i_atime); 1002 if (IS_DIRSYNC(dir)) 1003 exfat_sync_inode(dir); 1004 else 1005 mark_inode_dirty(dir); 1006 drop_nlink(dir); 1007 1008 clear_nlink(inode); 1009 inode->i_mtime = inode->i_atime = current_time(inode); 1010 exfat_truncate_atime(&inode->i_atime); 1011 exfat_unhash_inode(inode); 1012 exfat_d_version_set(dentry, inode_query_iversion(dir)); 1013 unlock: 1014 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 1015 return err; 1016 } 1017 1018 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, 1019 int oldentry, struct exfat_uni_name *p_uniname, 1020 struct exfat_inode_info *ei) 1021 { 1022 int ret, num_old_entries, num_new_entries; 1023 struct exfat_dentry *epold, *epnew; 1024 struct super_block *sb = inode->i_sb; 1025 struct buffer_head *new_bh, *old_bh; 1026 int sync = IS_DIRSYNC(inode); 1027 1028 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh); 1029 if (!epold) 1030 return -EIO; 1031 1032 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); 1033 if (num_old_entries < 0) 1034 return -EIO; 1035 num_old_entries++; 1036 1037 num_new_entries = exfat_calc_num_entries(p_uniname); 1038 if (num_new_entries < 0) 1039 return num_new_entries; 1040 1041 if (num_old_entries < num_new_entries) { 1042 int newentry; 1043 1044 newentry = 1045 exfat_find_empty_entry(inode, p_dir, num_new_entries); 1046 if (newentry < 0) 1047 return newentry; /* -EIO or -ENOSPC */ 1048 1049 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh); 1050 if (!epnew) 1051 return -EIO; 1052 1053 *epnew = *epold; 1054 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1055 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1056 ei->attr |= ATTR_ARCHIVE; 1057 } 1058 exfat_update_bh(new_bh, sync); 1059 brelse(old_bh); 1060 brelse(new_bh); 1061 1062 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh); 1063 if (!epold) 1064 return -EIO; 1065 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); 1066 if (!epnew) { 1067 brelse(old_bh); 1068 return -EIO; 1069 } 1070 1071 *epnew = *epold; 1072 exfat_update_bh(new_bh, sync); 1073 brelse(old_bh); 1074 brelse(new_bh); 1075 1076 ret = exfat_init_ext_entry(inode, p_dir, newentry, 1077 num_new_entries, p_uniname); 1078 if (ret) 1079 return ret; 1080 1081 exfat_remove_entries(inode, p_dir, oldentry, 0, 1082 num_old_entries); 1083 ei->dir = *p_dir; 1084 ei->entry = newentry; 1085 } else { 1086 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1087 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1088 ei->attr |= ATTR_ARCHIVE; 1089 } 1090 exfat_update_bh(old_bh, sync); 1091 brelse(old_bh); 1092 ret = exfat_init_ext_entry(inode, p_dir, oldentry, 1093 num_new_entries, p_uniname); 1094 if (ret) 1095 return ret; 1096 1097 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries, 1098 num_old_entries); 1099 } 1100 return 0; 1101 } 1102 1103 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, 1104 int oldentry, struct exfat_chain *p_newdir, 1105 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1106 { 1107 int ret, newentry, num_new_entries, num_old_entries; 1108 struct exfat_dentry *epmov, *epnew; 1109 struct super_block *sb = inode->i_sb; 1110 struct buffer_head *mov_bh, *new_bh; 1111 1112 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh); 1113 if (!epmov) 1114 return -EIO; 1115 1116 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, 1117 epmov); 1118 if (num_old_entries < 0) 1119 return -EIO; 1120 num_old_entries++; 1121 1122 num_new_entries = exfat_calc_num_entries(p_uniname); 1123 if (num_new_entries < 0) 1124 return num_new_entries; 1125 1126 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); 1127 if (newentry < 0) 1128 return newentry; /* -EIO or -ENOSPC */ 1129 1130 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh); 1131 if (!epnew) 1132 return -EIO; 1133 1134 *epnew = *epmov; 1135 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1136 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1137 ei->attr |= ATTR_ARCHIVE; 1138 } 1139 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1140 brelse(mov_bh); 1141 brelse(new_bh); 1142 1143 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh); 1144 if (!epmov) 1145 return -EIO; 1146 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); 1147 if (!epnew) { 1148 brelse(mov_bh); 1149 return -EIO; 1150 } 1151 1152 *epnew = *epmov; 1153 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1154 brelse(mov_bh); 1155 brelse(new_bh); 1156 1157 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, 1158 p_uniname); 1159 if (ret) 1160 return ret; 1161 1162 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); 1163 1164 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, 1165 p_newdir->flags); 1166 1167 ei->entry = newentry; 1168 return 0; 1169 } 1170 1171 /* rename or move a old file into a new file */ 1172 static int __exfat_rename(struct inode *old_parent_inode, 1173 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1174 struct dentry *new_dentry) 1175 { 1176 int ret; 1177 int dentry; 1178 struct exfat_chain olddir, newdir; 1179 struct exfat_chain *p_dir = NULL; 1180 struct exfat_uni_name uni_name; 1181 struct exfat_dentry *ep; 1182 struct super_block *sb = old_parent_inode->i_sb; 1183 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1184 const unsigned char *new_path = new_dentry->d_name.name; 1185 struct inode *new_inode = new_dentry->d_inode; 1186 int num_entries; 1187 struct exfat_inode_info *new_ei = NULL; 1188 unsigned int new_entry_type = TYPE_UNUSED; 1189 int new_entry = 0; 1190 struct buffer_head *old_bh, *new_bh = NULL; 1191 1192 /* check the validity of pointer parameters */ 1193 if (new_path == NULL || strlen(new_path) == 0) 1194 return -EINVAL; 1195 1196 if (ei->dir.dir == DIR_DELETED) { 1197 exfat_err(sb, "abnormal access to deleted source dentry"); 1198 return -ENOENT; 1199 } 1200 1201 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, 1202 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), 1203 EXFAT_I(old_parent_inode)->flags); 1204 dentry = ei->entry; 1205 1206 ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh); 1207 if (!ep) { 1208 ret = -EIO; 1209 goto out; 1210 } 1211 brelse(old_bh); 1212 1213 /* check whether new dir is existing directory and empty */ 1214 if (new_inode) { 1215 ret = -EIO; 1216 new_ei = EXFAT_I(new_inode); 1217 1218 if (new_ei->dir.dir == DIR_DELETED) { 1219 exfat_err(sb, "abnormal access to deleted target dentry"); 1220 goto out; 1221 } 1222 1223 p_dir = &(new_ei->dir); 1224 new_entry = new_ei->entry; 1225 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1226 if (!ep) 1227 goto out; 1228 1229 new_entry_type = exfat_get_entry_type(ep); 1230 brelse(new_bh); 1231 1232 /* if new_inode exists, update ei */ 1233 if (new_entry_type == TYPE_DIR) { 1234 struct exfat_chain new_clu; 1235 1236 new_clu.dir = new_ei->start_clu; 1237 new_clu.size = 1238 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1239 sbi); 1240 new_clu.flags = new_ei->flags; 1241 1242 ret = exfat_check_dir_empty(sb, &new_clu); 1243 if (ret) 1244 goto out; 1245 } 1246 } 1247 1248 /* check the validity of directory name in the given new pathname */ 1249 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, 1250 &uni_name); 1251 if (ret) 1252 goto out; 1253 1254 exfat_set_volume_dirty(sb); 1255 1256 if (olddir.dir == newdir.dir) 1257 ret = exfat_rename_file(new_parent_inode, &olddir, dentry, 1258 &uni_name, ei); 1259 else 1260 ret = exfat_move_file(new_parent_inode, &olddir, dentry, 1261 &newdir, &uni_name, ei); 1262 1263 if (!ret && new_inode) { 1264 /* delete entries of new_dir */ 1265 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1266 if (!ep) { 1267 ret = -EIO; 1268 goto del_out; 1269 } 1270 1271 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); 1272 if (num_entries < 0) { 1273 ret = -EIO; 1274 goto del_out; 1275 } 1276 brelse(new_bh); 1277 1278 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, 1279 num_entries + 1)) { 1280 ret = -EIO; 1281 goto del_out; 1282 } 1283 1284 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1285 if (new_entry_type == TYPE_DIR) { 1286 /* new_ei, new_clu_to_free */ 1287 struct exfat_chain new_clu_to_free; 1288 1289 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1290 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1291 sbi), new_ei->flags); 1292 1293 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1294 /* just set I/O error only */ 1295 ret = -EIO; 1296 } 1297 1298 i_size_write(new_inode, 0); 1299 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1300 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1301 } 1302 del_out: 1303 /* Update new_inode ei 1304 * Prevent syncing removed new_inode 1305 * (new_ei is already initialized above code ("if (new_inode)") 1306 */ 1307 new_ei->dir.dir = DIR_DELETED; 1308 } 1309 out: 1310 return ret; 1311 } 1312 1313 static int exfat_rename(struct user_namespace *mnt_userns, 1314 struct inode *old_dir, struct dentry *old_dentry, 1315 struct inode *new_dir, struct dentry *new_dentry, 1316 unsigned int flags) 1317 { 1318 struct inode *old_inode, *new_inode; 1319 struct super_block *sb = old_dir->i_sb; 1320 loff_t i_pos; 1321 int err; 1322 1323 /* 1324 * The VFS already checks for existence, so for local filesystems 1325 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1326 * Don't support any other flags 1327 */ 1328 if (flags & ~RENAME_NOREPLACE) 1329 return -EINVAL; 1330 1331 mutex_lock(&EXFAT_SB(sb)->s_lock); 1332 old_inode = old_dentry->d_inode; 1333 new_inode = new_dentry->d_inode; 1334 1335 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1336 if (err) 1337 goto unlock; 1338 1339 inode_inc_iversion(new_dir); 1340 new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = 1341 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1342 exfat_truncate_atime(&new_dir->i_atime); 1343 if (IS_DIRSYNC(new_dir)) 1344 exfat_sync_inode(new_dir); 1345 else 1346 mark_inode_dirty(new_dir); 1347 1348 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1349 (EXFAT_I(old_inode)->entry & 0xffffffff); 1350 exfat_unhash_inode(old_inode); 1351 exfat_hash_inode(old_inode, i_pos); 1352 if (IS_DIRSYNC(new_dir)) 1353 exfat_sync_inode(old_inode); 1354 else 1355 mark_inode_dirty(old_inode); 1356 1357 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1358 drop_nlink(old_dir); 1359 if (!new_inode) 1360 inc_nlink(new_dir); 1361 } 1362 1363 inode_inc_iversion(old_dir); 1364 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1365 if (IS_DIRSYNC(old_dir)) 1366 exfat_sync_inode(old_dir); 1367 else 1368 mark_inode_dirty(old_dir); 1369 1370 if (new_inode) { 1371 exfat_unhash_inode(new_inode); 1372 1373 /* skip drop_nlink if new_inode already has been dropped */ 1374 if (new_inode->i_nlink) { 1375 drop_nlink(new_inode); 1376 if (S_ISDIR(new_inode->i_mode)) 1377 drop_nlink(new_inode); 1378 } else { 1379 exfat_warn(sb, "abnormal access to an inode dropped"); 1380 WARN_ON(new_inode->i_nlink == 0); 1381 } 1382 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime = 1383 current_time(new_inode); 1384 } 1385 1386 unlock: 1387 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1388 return err; 1389 } 1390 1391 const struct inode_operations exfat_dir_inode_operations = { 1392 .create = exfat_create, 1393 .lookup = exfat_lookup, 1394 .unlink = exfat_unlink, 1395 .mkdir = exfat_mkdir, 1396 .rmdir = exfat_rmdir, 1397 .rename = exfat_rename, 1398 .setattr = exfat_setattr, 1399 .getattr = exfat_getattr, 1400 }; 1401