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 /* 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 */ 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 (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 } 472 473 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 && !sbi->options.zero_size_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 = EXFAT_ATTR_ARCHIVE; 549 info->start_clu = EXFAT_EOF_CLUSTER; 550 info->size = 0; 551 info->num_subdirs = 0; 552 } else { 553 info->attr = EXFAT_ATTR_SUBDIR; 554 if (sbi->options.zero_size_dir) 555 info->start_clu = EXFAT_EOF_CLUSTER; 556 else 557 info->start_clu = start_clu; 558 info->size = clu_size; 559 info->num_subdirs = EXFAT_MIN_SUBDIR; 560 } 561 memset(&info->crtime, 0, sizeof(info->crtime)); 562 memset(&info->mtime, 0, sizeof(info->mtime)); 563 memset(&info->atime, 0, sizeof(info->atime)); 564 out: 565 return ret; 566 } 567 568 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, 569 struct dentry *dentry, umode_t mode, bool excl) 570 { 571 struct super_block *sb = dir->i_sb; 572 struct inode *inode; 573 struct exfat_chain cdir; 574 struct exfat_dir_entry info; 575 loff_t i_pos; 576 int err; 577 578 mutex_lock(&EXFAT_SB(sb)->s_lock); 579 exfat_set_volume_dirty(sb); 580 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, 581 &info); 582 if (err) 583 goto unlock; 584 585 inode_inc_iversion(dir); 586 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 587 if (IS_DIRSYNC(dir)) 588 exfat_sync_inode(dir); 589 else 590 mark_inode_dirty(dir); 591 592 i_pos = exfat_make_i_pos(&info); 593 inode = exfat_build_inode(sb, &info, i_pos); 594 err = PTR_ERR_OR_ZERO(inode); 595 if (err) 596 goto unlock; 597 598 inode_inc_iversion(inode); 599 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 600 exfat_truncate_inode_atime(inode); 601 602 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 603 604 d_instantiate(dentry, inode); 605 unlock: 606 mutex_unlock(&EXFAT_SB(sb)->s_lock); 607 return err; 608 } 609 610 /* lookup a file */ 611 static int exfat_find(struct inode *dir, struct qstr *qname, 612 struct exfat_dir_entry *info) 613 { 614 int ret, dentry, count; 615 struct exfat_chain cdir; 616 struct exfat_uni_name uni_name; 617 struct super_block *sb = dir->i_sb; 618 struct exfat_sb_info *sbi = EXFAT_SB(sb); 619 struct exfat_inode_info *ei = EXFAT_I(dir); 620 struct exfat_dentry *ep, *ep2; 621 struct exfat_entry_set_cache es; 622 /* for optimized dir & entry to prevent long traverse of cluster chain */ 623 struct exfat_hint hint_opt; 624 625 if (qname->len == 0) 626 return -ENOENT; 627 628 /* check the validity of directory name in the given pathname */ 629 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); 630 if (ret) 631 return ret; 632 633 /* check the validation of hint_stat and initialize it if required */ 634 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 635 ei->hint_stat.clu = cdir.dir; 636 ei->hint_stat.eidx = 0; 637 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 638 ei->hint_femp.eidx = EXFAT_HINT_NONE; 639 } 640 641 /* search the file name for directories */ 642 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt); 643 if (dentry < 0) 644 return dentry; /* -error value */ 645 646 info->dir = cdir; 647 info->entry = dentry; 648 info->num_subdirs = 0; 649 650 /* adjust cdir to the optimized value */ 651 cdir.dir = hint_opt.clu; 652 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 653 cdir.size -= dentry / sbi->dentries_per_clu; 654 dentry = hint_opt.eidx; 655 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES)) 656 return -EIO; 657 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE); 658 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM); 659 660 info->type = exfat_get_entry_type(ep); 661 info->attr = le16_to_cpu(ep->dentry.file.attr); 662 info->size = le64_to_cpu(ep2->dentry.stream.valid_size); 663 if (info->size == 0) { 664 info->flags = ALLOC_NO_FAT_CHAIN; 665 info->start_clu = EXFAT_EOF_CLUSTER; 666 } else { 667 info->flags = ep2->dentry.stream.flags; 668 info->start_clu = 669 le32_to_cpu(ep2->dentry.stream.start_clu); 670 } 671 672 exfat_get_entry_time(sbi, &info->crtime, 673 ep->dentry.file.create_tz, 674 ep->dentry.file.create_time, 675 ep->dentry.file.create_date, 676 ep->dentry.file.create_time_cs); 677 exfat_get_entry_time(sbi, &info->mtime, 678 ep->dentry.file.modify_tz, 679 ep->dentry.file.modify_time, 680 ep->dentry.file.modify_date, 681 ep->dentry.file.modify_time_cs); 682 exfat_get_entry_time(sbi, &info->atime, 683 ep->dentry.file.access_tz, 684 ep->dentry.file.access_time, 685 ep->dentry.file.access_date, 686 0); 687 exfat_put_dentry_set(&es, false); 688 689 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 690 exfat_fs_error(sb, 691 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 692 i_size_read(dir), ei->dir.dir, ei->entry); 693 return -EIO; 694 } 695 696 if (info->type == TYPE_DIR) { 697 exfat_chain_set(&cdir, info->start_clu, 698 EXFAT_B_TO_CLU(info->size, sbi), info->flags); 699 count = exfat_count_dir_entries(sb, &cdir); 700 if (count < 0) 701 return -EIO; 702 703 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 704 } 705 return 0; 706 } 707 708 static int exfat_d_anon_disconn(struct dentry *dentry) 709 { 710 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); 711 } 712 713 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 714 unsigned int flags) 715 { 716 struct super_block *sb = dir->i_sb; 717 struct inode *inode; 718 struct dentry *alias; 719 struct exfat_dir_entry info; 720 int err; 721 loff_t i_pos; 722 mode_t i_mode; 723 724 mutex_lock(&EXFAT_SB(sb)->s_lock); 725 err = exfat_find(dir, &dentry->d_name, &info); 726 if (err) { 727 if (err == -ENOENT) { 728 inode = NULL; 729 goto out; 730 } 731 goto unlock; 732 } 733 734 i_pos = exfat_make_i_pos(&info); 735 inode = exfat_build_inode(sb, &info, i_pos); 736 err = PTR_ERR_OR_ZERO(inode); 737 if (err) 738 goto unlock; 739 740 i_mode = inode->i_mode; 741 alias = d_find_alias(inode); 742 743 /* 744 * Checking "alias->d_parent == dentry->d_parent" to make sure 745 * FS is not corrupted (especially double linked dir). 746 */ 747 if (alias && alias->d_parent == dentry->d_parent && 748 !exfat_d_anon_disconn(alias)) { 749 750 /* 751 * Unhashed alias is able to exist because of revalidate() 752 * called by lookup_fast. You can easily make this status 753 * by calling create and lookup concurrently 754 * In such case, we reuse an alias instead of new dentry 755 */ 756 if (d_unhashed(alias)) { 757 WARN_ON(alias->d_name.hash_len != 758 dentry->d_name.hash_len); 759 exfat_info(sb, "rehashed a dentry(%p) in read lookup", 760 alias); 761 d_drop(dentry); 762 d_rehash(alias); 763 } else if (!S_ISDIR(i_mode)) { 764 /* 765 * This inode has non anonymous-DCACHE_DISCONNECTED 766 * dentry. This means, the user did ->lookup() by an 767 * another name (longname vs 8.3 alias of it) in past. 768 * 769 * Switch to new one for reason of locality if possible. 770 */ 771 d_move(alias, dentry); 772 } 773 iput(inode); 774 mutex_unlock(&EXFAT_SB(sb)->s_lock); 775 return alias; 776 } 777 dput(alias); 778 out: 779 mutex_unlock(&EXFAT_SB(sb)->s_lock); 780 if (!inode) 781 exfat_d_version_set(dentry, inode_query_iversion(dir)); 782 783 return d_splice_alias(inode, dentry); 784 unlock: 785 mutex_unlock(&EXFAT_SB(sb)->s_lock); 786 return ERR_PTR(err); 787 } 788 789 /* remove an entry, BUT don't truncate */ 790 static int exfat_unlink(struct inode *dir, struct dentry *dentry) 791 { 792 struct exfat_chain cdir; 793 struct exfat_dentry *ep; 794 struct super_block *sb = dir->i_sb; 795 struct inode *inode = dentry->d_inode; 796 struct exfat_inode_info *ei = EXFAT_I(inode); 797 struct buffer_head *bh; 798 int num_entries, entry, err = 0; 799 800 mutex_lock(&EXFAT_SB(sb)->s_lock); 801 exfat_chain_dup(&cdir, &ei->dir); 802 entry = ei->entry; 803 if (ei->dir.dir == DIR_DELETED) { 804 exfat_err(sb, "abnormal access to deleted dentry"); 805 err = -ENOENT; 806 goto unlock; 807 } 808 809 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 810 if (!ep) { 811 err = -EIO; 812 goto unlock; 813 } 814 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 815 if (num_entries < 0) { 816 err = -EIO; 817 brelse(bh); 818 goto unlock; 819 } 820 num_entries++; 821 brelse(bh); 822 823 exfat_set_volume_dirty(sb); 824 /* update the directory entry */ 825 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { 826 err = -EIO; 827 goto unlock; 828 } 829 830 /* This doesn't modify ei */ 831 ei->dir.dir = DIR_DELETED; 832 833 inode_inc_iversion(dir); 834 simple_inode_init_ts(dir); 835 exfat_truncate_inode_atime(dir); 836 if (IS_DIRSYNC(dir)) 837 exfat_sync_inode(dir); 838 else 839 mark_inode_dirty(dir); 840 841 clear_nlink(inode); 842 simple_inode_init_ts(inode); 843 exfat_truncate_inode_atime(inode); 844 exfat_unhash_inode(inode); 845 exfat_d_version_set(dentry, inode_query_iversion(dir)); 846 unlock: 847 mutex_unlock(&EXFAT_SB(sb)->s_lock); 848 return err; 849 } 850 851 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, 852 struct dentry *dentry, umode_t mode) 853 { 854 struct super_block *sb = dir->i_sb; 855 struct inode *inode; 856 struct exfat_dir_entry info; 857 struct exfat_chain cdir; 858 loff_t i_pos; 859 int err; 860 861 mutex_lock(&EXFAT_SB(sb)->s_lock); 862 exfat_set_volume_dirty(sb); 863 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, 864 &info); 865 if (err) 866 goto unlock; 867 868 inode_inc_iversion(dir); 869 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 870 if (IS_DIRSYNC(dir)) 871 exfat_sync_inode(dir); 872 else 873 mark_inode_dirty(dir); 874 inc_nlink(dir); 875 876 i_pos = exfat_make_i_pos(&info); 877 inode = exfat_build_inode(sb, &info, i_pos); 878 err = PTR_ERR_OR_ZERO(inode); 879 if (err) 880 goto unlock; 881 882 inode_inc_iversion(inode); 883 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 884 exfat_truncate_inode_atime(inode); 885 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 886 887 d_instantiate(dentry, inode); 888 889 unlock: 890 mutex_unlock(&EXFAT_SB(sb)->s_lock); 891 return err; 892 } 893 894 static int exfat_check_dir_empty(struct super_block *sb, 895 struct exfat_chain *p_dir) 896 { 897 int i, dentries_per_clu; 898 unsigned int type; 899 struct exfat_chain clu; 900 struct exfat_dentry *ep; 901 struct exfat_sb_info *sbi = EXFAT_SB(sb); 902 struct buffer_head *bh; 903 904 dentries_per_clu = sbi->dentries_per_clu; 905 906 if (p_dir->dir == EXFAT_EOF_CLUSTER) 907 return 0; 908 909 exfat_chain_dup(&clu, p_dir); 910 911 while (clu.dir != EXFAT_EOF_CLUSTER) { 912 for (i = 0; i < dentries_per_clu; i++) { 913 ep = exfat_get_dentry(sb, &clu, i, &bh); 914 if (!ep) 915 return -EIO; 916 type = exfat_get_entry_type(ep); 917 brelse(bh); 918 if (type == TYPE_UNUSED) 919 return 0; 920 921 if (type != TYPE_FILE && type != TYPE_DIR) 922 continue; 923 924 return -ENOTEMPTY; 925 } 926 927 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 928 if (--clu.size > 0) 929 clu.dir++; 930 else 931 clu.dir = EXFAT_EOF_CLUSTER; 932 } else { 933 if (exfat_get_next_cluster(sb, &(clu.dir))) 934 return -EIO; 935 } 936 } 937 938 return 0; 939 } 940 941 static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 942 { 943 struct inode *inode = dentry->d_inode; 944 struct exfat_dentry *ep; 945 struct exfat_chain cdir, clu_to_free; 946 struct super_block *sb = inode->i_sb; 947 struct exfat_sb_info *sbi = EXFAT_SB(sb); 948 struct exfat_inode_info *ei = EXFAT_I(inode); 949 struct buffer_head *bh; 950 int num_entries, entry, err; 951 952 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 953 954 exfat_chain_dup(&cdir, &ei->dir); 955 entry = ei->entry; 956 957 if (ei->dir.dir == DIR_DELETED) { 958 exfat_err(sb, "abnormal access to deleted dentry"); 959 err = -ENOENT; 960 goto unlock; 961 } 962 963 exfat_chain_set(&clu_to_free, ei->start_clu, 964 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); 965 966 err = exfat_check_dir_empty(sb, &clu_to_free); 967 if (err) { 968 if (err == -EIO) 969 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 970 err); 971 goto unlock; 972 } 973 974 ep = exfat_get_dentry(sb, &cdir, entry, &bh); 975 if (!ep) { 976 err = -EIO; 977 goto unlock; 978 } 979 980 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 981 if (num_entries < 0) { 982 err = -EIO; 983 brelse(bh); 984 goto unlock; 985 } 986 num_entries++; 987 brelse(bh); 988 989 exfat_set_volume_dirty(sb); 990 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); 991 if (err) { 992 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); 993 goto unlock; 994 } 995 ei->dir.dir = DIR_DELETED; 996 997 inode_inc_iversion(dir); 998 simple_inode_init_ts(dir); 999 exfat_truncate_inode_atime(dir); 1000 if (IS_DIRSYNC(dir)) 1001 exfat_sync_inode(dir); 1002 else 1003 mark_inode_dirty(dir); 1004 drop_nlink(dir); 1005 1006 clear_nlink(inode); 1007 simple_inode_init_ts(inode); 1008 exfat_truncate_inode_atime(inode); 1009 exfat_unhash_inode(inode); 1010 exfat_d_version_set(dentry, inode_query_iversion(dir)); 1011 unlock: 1012 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 1013 return err; 1014 } 1015 1016 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, 1017 int oldentry, struct exfat_uni_name *p_uniname, 1018 struct exfat_inode_info *ei) 1019 { 1020 int ret, num_old_entries, num_new_entries; 1021 struct exfat_dentry *epold, *epnew; 1022 struct super_block *sb = inode->i_sb; 1023 struct buffer_head *new_bh, *old_bh; 1024 int sync = IS_DIRSYNC(inode); 1025 1026 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh); 1027 if (!epold) 1028 return -EIO; 1029 1030 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); 1031 if (num_old_entries < 0) 1032 return -EIO; 1033 num_old_entries++; 1034 1035 num_new_entries = exfat_calc_num_entries(p_uniname); 1036 if (num_new_entries < 0) 1037 return num_new_entries; 1038 1039 if (num_old_entries < num_new_entries) { 1040 int newentry; 1041 1042 newentry = 1043 exfat_find_empty_entry(inode, p_dir, num_new_entries); 1044 if (newentry < 0) 1045 return newentry; /* -EIO or -ENOSPC */ 1046 1047 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh); 1048 if (!epnew) 1049 return -EIO; 1050 1051 *epnew = *epold; 1052 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1053 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1054 ei->attr |= EXFAT_ATTR_ARCHIVE; 1055 } 1056 exfat_update_bh(new_bh, sync); 1057 brelse(old_bh); 1058 brelse(new_bh); 1059 1060 epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh); 1061 if (!epold) 1062 return -EIO; 1063 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); 1064 if (!epnew) { 1065 brelse(old_bh); 1066 return -EIO; 1067 } 1068 1069 *epnew = *epold; 1070 exfat_update_bh(new_bh, sync); 1071 brelse(old_bh); 1072 brelse(new_bh); 1073 1074 ret = exfat_init_ext_entry(inode, p_dir, newentry, 1075 num_new_entries, p_uniname); 1076 if (ret) 1077 return ret; 1078 1079 exfat_remove_entries(inode, p_dir, oldentry, 0, 1080 num_old_entries); 1081 ei->dir = *p_dir; 1082 ei->entry = newentry; 1083 } else { 1084 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1085 epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1086 ei->attr |= EXFAT_ATTR_ARCHIVE; 1087 } 1088 exfat_update_bh(old_bh, sync); 1089 brelse(old_bh); 1090 ret = exfat_init_ext_entry(inode, p_dir, oldentry, 1091 num_new_entries, p_uniname); 1092 if (ret) 1093 return ret; 1094 1095 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries, 1096 num_old_entries); 1097 } 1098 return 0; 1099 } 1100 1101 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, 1102 int oldentry, struct exfat_chain *p_newdir, 1103 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1104 { 1105 int ret, newentry, num_new_entries, num_old_entries; 1106 struct exfat_dentry *epmov, *epnew; 1107 struct super_block *sb = inode->i_sb; 1108 struct buffer_head *mov_bh, *new_bh; 1109 1110 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh); 1111 if (!epmov) 1112 return -EIO; 1113 1114 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, 1115 epmov); 1116 if (num_old_entries < 0) 1117 return -EIO; 1118 num_old_entries++; 1119 1120 num_new_entries = exfat_calc_num_entries(p_uniname); 1121 if (num_new_entries < 0) 1122 return num_new_entries; 1123 1124 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); 1125 if (newentry < 0) 1126 return newentry; /* -EIO or -ENOSPC */ 1127 1128 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh); 1129 if (!epnew) 1130 return -EIO; 1131 1132 *epnew = *epmov; 1133 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1134 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1135 ei->attr |= EXFAT_ATTR_ARCHIVE; 1136 } 1137 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1138 brelse(mov_bh); 1139 brelse(new_bh); 1140 1141 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh); 1142 if (!epmov) 1143 return -EIO; 1144 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); 1145 if (!epnew) { 1146 brelse(mov_bh); 1147 return -EIO; 1148 } 1149 1150 *epnew = *epmov; 1151 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1152 brelse(mov_bh); 1153 brelse(new_bh); 1154 1155 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, 1156 p_uniname); 1157 if (ret) 1158 return ret; 1159 1160 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); 1161 1162 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, 1163 p_newdir->flags); 1164 1165 ei->entry = newentry; 1166 return 0; 1167 } 1168 1169 /* rename or move a old file into a new file */ 1170 static int __exfat_rename(struct inode *old_parent_inode, 1171 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1172 struct dentry *new_dentry) 1173 { 1174 int ret; 1175 int dentry; 1176 struct exfat_chain olddir, newdir; 1177 struct exfat_chain *p_dir = NULL; 1178 struct exfat_uni_name uni_name; 1179 struct exfat_dentry *ep; 1180 struct super_block *sb = old_parent_inode->i_sb; 1181 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1182 const unsigned char *new_path = new_dentry->d_name.name; 1183 struct inode *new_inode = new_dentry->d_inode; 1184 int num_entries; 1185 struct exfat_inode_info *new_ei = NULL; 1186 unsigned int new_entry_type = TYPE_UNUSED; 1187 int new_entry = 0; 1188 struct buffer_head *new_bh = NULL; 1189 1190 /* check the validity of pointer parameters */ 1191 if (new_path == NULL || strlen(new_path) == 0) 1192 return -EINVAL; 1193 1194 if (ei->dir.dir == DIR_DELETED) { 1195 exfat_err(sb, "abnormal access to deleted source dentry"); 1196 return -ENOENT; 1197 } 1198 1199 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, 1200 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), 1201 EXFAT_I(old_parent_inode)->flags); 1202 dentry = ei->entry; 1203 1204 /* check whether new dir is existing directory and empty */ 1205 if (new_inode) { 1206 ret = -EIO; 1207 new_ei = EXFAT_I(new_inode); 1208 1209 if (new_ei->dir.dir == DIR_DELETED) { 1210 exfat_err(sb, "abnormal access to deleted target dentry"); 1211 goto out; 1212 } 1213 1214 p_dir = &(new_ei->dir); 1215 new_entry = new_ei->entry; 1216 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1217 if (!ep) 1218 goto out; 1219 1220 new_entry_type = exfat_get_entry_type(ep); 1221 brelse(new_bh); 1222 1223 /* if new_inode exists, update ei */ 1224 if (new_entry_type == TYPE_DIR) { 1225 struct exfat_chain new_clu; 1226 1227 new_clu.dir = new_ei->start_clu; 1228 new_clu.size = 1229 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1230 sbi); 1231 new_clu.flags = new_ei->flags; 1232 1233 ret = exfat_check_dir_empty(sb, &new_clu); 1234 if (ret) 1235 goto out; 1236 } 1237 } 1238 1239 /* check the validity of directory name in the given new pathname */ 1240 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, 1241 &uni_name); 1242 if (ret) 1243 goto out; 1244 1245 exfat_set_volume_dirty(sb); 1246 1247 if (olddir.dir == newdir.dir) 1248 ret = exfat_rename_file(new_parent_inode, &olddir, dentry, 1249 &uni_name, ei); 1250 else 1251 ret = exfat_move_file(new_parent_inode, &olddir, dentry, 1252 &newdir, &uni_name, ei); 1253 1254 if (!ret && new_inode) { 1255 /* delete entries of new_dir */ 1256 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1257 if (!ep) { 1258 ret = -EIO; 1259 goto del_out; 1260 } 1261 1262 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); 1263 if (num_entries < 0) { 1264 ret = -EIO; 1265 goto del_out; 1266 } 1267 brelse(new_bh); 1268 1269 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, 1270 num_entries + 1)) { 1271 ret = -EIO; 1272 goto del_out; 1273 } 1274 1275 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1276 if (new_entry_type == TYPE_DIR && 1277 new_ei->start_clu != EXFAT_EOF_CLUSTER) { 1278 /* new_ei, new_clu_to_free */ 1279 struct exfat_chain new_clu_to_free; 1280 1281 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1282 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1283 sbi), new_ei->flags); 1284 1285 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1286 /* just set I/O error only */ 1287 ret = -EIO; 1288 } 1289 1290 i_size_write(new_inode, 0); 1291 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1292 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1293 } 1294 del_out: 1295 /* Update new_inode ei 1296 * Prevent syncing removed new_inode 1297 * (new_ei is already initialized above code ("if (new_inode)") 1298 */ 1299 new_ei->dir.dir = DIR_DELETED; 1300 } 1301 out: 1302 return ret; 1303 } 1304 1305 static int exfat_rename(struct mnt_idmap *idmap, 1306 struct inode *old_dir, struct dentry *old_dentry, 1307 struct inode *new_dir, struct dentry *new_dentry, 1308 unsigned int flags) 1309 { 1310 struct inode *old_inode, *new_inode; 1311 struct super_block *sb = old_dir->i_sb; 1312 loff_t i_pos; 1313 int err; 1314 1315 /* 1316 * The VFS already checks for existence, so for local filesystems 1317 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1318 * Don't support any other flags 1319 */ 1320 if (flags & ~RENAME_NOREPLACE) 1321 return -EINVAL; 1322 1323 mutex_lock(&EXFAT_SB(sb)->s_lock); 1324 old_inode = old_dentry->d_inode; 1325 new_inode = new_dentry->d_inode; 1326 1327 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1328 if (err) 1329 goto unlock; 1330 1331 inode_inc_iversion(new_dir); 1332 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); 1333 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1334 exfat_truncate_inode_atime(new_dir); 1335 if (IS_DIRSYNC(new_dir)) 1336 exfat_sync_inode(new_dir); 1337 else 1338 mark_inode_dirty(new_dir); 1339 1340 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1341 (EXFAT_I(old_inode)->entry & 0xffffffff); 1342 exfat_unhash_inode(old_inode); 1343 exfat_hash_inode(old_inode, i_pos); 1344 if (IS_DIRSYNC(new_dir)) 1345 exfat_sync_inode(old_inode); 1346 else 1347 mark_inode_dirty(old_inode); 1348 1349 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1350 drop_nlink(old_dir); 1351 if (!new_inode) 1352 inc_nlink(new_dir); 1353 } 1354 1355 inode_inc_iversion(old_dir); 1356 if (IS_DIRSYNC(old_dir)) 1357 exfat_sync_inode(old_dir); 1358 else 1359 mark_inode_dirty(old_dir); 1360 1361 if (new_inode) { 1362 exfat_unhash_inode(new_inode); 1363 1364 /* skip drop_nlink if new_inode already has been dropped */ 1365 if (new_inode->i_nlink) { 1366 drop_nlink(new_inode); 1367 if (S_ISDIR(new_inode->i_mode)) 1368 drop_nlink(new_inode); 1369 } else { 1370 exfat_warn(sb, "abnormal access to an inode dropped"); 1371 WARN_ON(new_inode->i_nlink == 0); 1372 } 1373 EXFAT_I(new_inode)->i_crtime = current_time(new_inode); 1374 } 1375 1376 unlock: 1377 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1378 return err; 1379 } 1380 1381 const struct inode_operations exfat_dir_inode_operations = { 1382 .create = exfat_create, 1383 .lookup = exfat_lookup, 1384 .unlink = exfat_unlink, 1385 .mkdir = exfat_mkdir, 1386 .rmdir = exfat_rmdir, 1387 .rename = exfat_rename, 1388 .setattr = exfat_setattr, 1389 .getattr = exfat_getattr, 1390 }; 1391