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->valid_size += sbi->cluster_size; 410 ei->flags = p_dir->flags; 411 inode->i_blocks += sbi->cluster_size >> 9; 412 } 413 414 return dentry; 415 } 416 417 /* 418 * Name Resolution Functions : 419 * Zero if it was successful; otherwise nonzero. 420 */ 421 static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, 422 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 423 int lookup) 424 { 425 int namelen; 426 int lossy = NLS_NAME_NO_LOSSY; 427 struct super_block *sb = inode->i_sb; 428 struct exfat_sb_info *sbi = EXFAT_SB(sb); 429 struct exfat_inode_info *ei = EXFAT_I(inode); 430 int pathlen = strlen(path); 431 432 /* 433 * get the length of the pathname excluding 434 * trailing periods, if any. 435 */ 436 namelen = exfat_striptail_len(pathlen, path, false); 437 if (EXFAT_SB(sb)->options.keep_last_dots) { 438 /* 439 * Do not allow the creation of files with names 440 * ending with period(s). 441 */ 442 if (!lookup && (namelen < pathlen)) 443 return -EINVAL; 444 namelen = pathlen; 445 } 446 if (!namelen) 447 return -ENOENT; 448 if (pathlen > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) 449 return -ENAMETOOLONG; 450 451 /* 452 * strip all leading spaces : 453 * "MS windows 7" supports leading spaces. 454 * So we should skip this preprocessing for compatibility. 455 */ 456 457 /* file name conversion : 458 * If lookup case, we allow bad-name for compatibility. 459 */ 460 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, 461 &lossy); 462 if (namelen < 0) 463 return namelen; /* return error value */ 464 465 if ((lossy && !lookup) || !namelen) 466 return (lossy & NLS_NAME_OVERLEN) ? -ENAMETOOLONG : -EINVAL; 467 468 exfat_chain_set(p_dir, ei->start_clu, 469 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); 470 471 return 0; 472 } 473 474 static inline int exfat_resolve_path(struct inode *inode, 475 const unsigned char *path, struct exfat_chain *dir, 476 struct exfat_uni_name *uni) 477 { 478 return __exfat_resolve_path(inode, path, dir, uni, 0); 479 } 480 481 static inline int exfat_resolve_path_for_lookup(struct inode *inode, 482 const unsigned char *path, struct exfat_chain *dir, 483 struct exfat_uni_name *uni) 484 { 485 return __exfat_resolve_path(inode, path, dir, uni, 1); 486 } 487 488 static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) 489 { 490 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); 491 } 492 493 static int exfat_add_entry(struct inode *inode, const char *path, 494 struct exfat_chain *p_dir, unsigned int type, 495 struct exfat_dir_entry *info) 496 { 497 int ret, dentry, num_entries; 498 struct super_block *sb = inode->i_sb; 499 struct exfat_sb_info *sbi = EXFAT_SB(sb); 500 struct exfat_uni_name uniname; 501 struct exfat_chain clu; 502 struct timespec64 ts = current_time(inode); 503 struct exfat_entry_set_cache es; 504 int clu_size = 0; 505 unsigned int start_clu = EXFAT_FREE_CLUSTER; 506 507 ret = exfat_resolve_path(inode, path, p_dir, &uniname); 508 if (ret) 509 goto out; 510 511 num_entries = exfat_calc_num_entries(&uniname); 512 if (num_entries < 0) { 513 ret = num_entries; 514 goto out; 515 } 516 517 /* exfat_find_empty_entry must be called before alloc_cluster() */ 518 dentry = exfat_find_empty_entry(inode, p_dir, num_entries); 519 if (dentry < 0) { 520 ret = dentry; /* -EIO or -ENOSPC */ 521 goto out; 522 } 523 524 if (type == TYPE_DIR && !sbi->options.zero_size_dir) { 525 ret = exfat_alloc_new_dir(inode, &clu); 526 if (ret) 527 goto out; 528 start_clu = clu.dir; 529 clu_size = sbi->cluster_size; 530 } 531 532 /* update the directory entry */ 533 /* fill the dos name directory entry information of the created file. 534 * the first cluster is not determined yet. (0) 535 */ 536 537 ret = exfat_get_empty_dentry_set(&es, sb, p_dir, dentry, num_entries); 538 if (ret) 539 goto out; 540 541 exfat_init_dir_entry(&es, type, start_clu, clu_size, &ts); 542 543 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(inode)); 544 if (ret) 545 goto out; 546 547 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); 548 if (ret) 549 goto out; 550 551 info->dir = *p_dir; 552 info->entry = dentry; 553 info->flags = ALLOC_NO_FAT_CHAIN; 554 info->type = type; 555 556 if (type == TYPE_FILE) { 557 info->attr = EXFAT_ATTR_ARCHIVE; 558 info->start_clu = EXFAT_EOF_CLUSTER; 559 info->size = 0; 560 info->num_subdirs = 0; 561 } else { 562 info->attr = EXFAT_ATTR_SUBDIR; 563 if (sbi->options.zero_size_dir) 564 info->start_clu = EXFAT_EOF_CLUSTER; 565 else 566 info->start_clu = start_clu; 567 info->size = clu_size; 568 info->num_subdirs = EXFAT_MIN_SUBDIR; 569 } 570 info->valid_size = info->size; 571 572 memset(&info->crtime, 0, sizeof(info->crtime)); 573 memset(&info->mtime, 0, sizeof(info->mtime)); 574 memset(&info->atime, 0, sizeof(info->atime)); 575 out: 576 return ret; 577 } 578 579 static int exfat_create(struct mnt_idmap *idmap, struct inode *dir, 580 struct dentry *dentry, umode_t mode, bool excl) 581 { 582 struct super_block *sb = dir->i_sb; 583 struct inode *inode; 584 struct exfat_chain cdir; 585 struct exfat_dir_entry info; 586 loff_t i_pos; 587 int err; 588 589 mutex_lock(&EXFAT_SB(sb)->s_lock); 590 exfat_set_volume_dirty(sb); 591 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, 592 &info); 593 if (err) 594 goto unlock; 595 596 inode_inc_iversion(dir); 597 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 598 if (IS_DIRSYNC(dir)) 599 exfat_sync_inode(dir); 600 else 601 mark_inode_dirty(dir); 602 603 i_pos = exfat_make_i_pos(&info); 604 inode = exfat_build_inode(sb, &info, i_pos); 605 err = PTR_ERR_OR_ZERO(inode); 606 if (err) 607 goto unlock; 608 609 inode_inc_iversion(inode); 610 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 611 exfat_truncate_inode_atime(inode); 612 613 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 614 615 d_instantiate(dentry, inode); 616 unlock: 617 mutex_unlock(&EXFAT_SB(sb)->s_lock); 618 return err; 619 } 620 621 /* lookup a file */ 622 static int exfat_find(struct inode *dir, struct qstr *qname, 623 struct exfat_dir_entry *info) 624 { 625 int ret, dentry, count; 626 struct exfat_chain cdir; 627 struct exfat_uni_name uni_name; 628 struct super_block *sb = dir->i_sb; 629 struct exfat_sb_info *sbi = EXFAT_SB(sb); 630 struct exfat_inode_info *ei = EXFAT_I(dir); 631 struct exfat_dentry *ep, *ep2; 632 struct exfat_entry_set_cache es; 633 /* for optimized dir & entry to prevent long traverse of cluster chain */ 634 struct exfat_hint hint_opt; 635 636 if (qname->len == 0) 637 return -ENOENT; 638 639 /* check the validity of directory name in the given pathname */ 640 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); 641 if (ret) 642 return ret; 643 644 /* check the validation of hint_stat and initialize it if required */ 645 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 646 ei->hint_stat.clu = cdir.dir; 647 ei->hint_stat.eidx = 0; 648 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 649 ei->hint_femp.eidx = EXFAT_HINT_NONE; 650 } 651 652 /* search the file name for directories */ 653 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, &hint_opt); 654 if (dentry < 0) 655 return dentry; /* -error value */ 656 657 info->dir = cdir; 658 info->entry = dentry; 659 info->num_subdirs = 0; 660 661 /* adjust cdir to the optimized value */ 662 cdir.dir = hint_opt.clu; 663 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 664 cdir.size -= dentry / sbi->dentries_per_clu; 665 dentry = hint_opt.eidx; 666 if (exfat_get_dentry_set(&es, sb, &cdir, dentry, ES_2_ENTRIES)) 667 return -EIO; 668 ep = exfat_get_dentry_cached(&es, ES_IDX_FILE); 669 ep2 = exfat_get_dentry_cached(&es, ES_IDX_STREAM); 670 671 info->type = exfat_get_entry_type(ep); 672 info->attr = le16_to_cpu(ep->dentry.file.attr); 673 info->size = le64_to_cpu(ep2->dentry.stream.valid_size); 674 info->valid_size = le64_to_cpu(ep2->dentry.stream.valid_size); 675 info->size = le64_to_cpu(ep2->dentry.stream.size); 676 if (info->size == 0) { 677 info->flags = ALLOC_NO_FAT_CHAIN; 678 info->start_clu = EXFAT_EOF_CLUSTER; 679 } else { 680 info->flags = ep2->dentry.stream.flags; 681 info->start_clu = 682 le32_to_cpu(ep2->dentry.stream.start_clu); 683 } 684 685 exfat_get_entry_time(sbi, &info->crtime, 686 ep->dentry.file.create_tz, 687 ep->dentry.file.create_time, 688 ep->dentry.file.create_date, 689 ep->dentry.file.create_time_cs); 690 exfat_get_entry_time(sbi, &info->mtime, 691 ep->dentry.file.modify_tz, 692 ep->dentry.file.modify_time, 693 ep->dentry.file.modify_date, 694 ep->dentry.file.modify_time_cs); 695 exfat_get_entry_time(sbi, &info->atime, 696 ep->dentry.file.access_tz, 697 ep->dentry.file.access_time, 698 ep->dentry.file.access_date, 699 0); 700 exfat_put_dentry_set(&es, false); 701 702 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 703 exfat_fs_error(sb, 704 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 705 i_size_read(dir), ei->dir.dir, ei->entry); 706 return -EIO; 707 } 708 709 if (info->type == TYPE_DIR) { 710 exfat_chain_set(&cdir, info->start_clu, 711 EXFAT_B_TO_CLU(info->size, sbi), info->flags); 712 count = exfat_count_dir_entries(sb, &cdir); 713 if (count < 0) 714 return -EIO; 715 716 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 717 } 718 return 0; 719 } 720 721 static int exfat_d_anon_disconn(struct dentry *dentry) 722 { 723 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); 724 } 725 726 static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 727 unsigned int flags) 728 { 729 struct super_block *sb = dir->i_sb; 730 struct inode *inode; 731 struct dentry *alias; 732 struct exfat_dir_entry info; 733 int err; 734 loff_t i_pos; 735 mode_t i_mode; 736 737 mutex_lock(&EXFAT_SB(sb)->s_lock); 738 err = exfat_find(dir, &dentry->d_name, &info); 739 if (err) { 740 if (err == -ENOENT) { 741 inode = NULL; 742 goto out; 743 } 744 goto unlock; 745 } 746 747 i_pos = exfat_make_i_pos(&info); 748 inode = exfat_build_inode(sb, &info, i_pos); 749 err = PTR_ERR_OR_ZERO(inode); 750 if (err) 751 goto unlock; 752 753 i_mode = inode->i_mode; 754 alias = d_find_alias(inode); 755 756 /* 757 * Checking "alias->d_parent == dentry->d_parent" to make sure 758 * FS is not corrupted (especially double linked dir). 759 */ 760 if (alias && alias->d_parent == dentry->d_parent && 761 !exfat_d_anon_disconn(alias)) { 762 763 /* 764 * Unhashed alias is able to exist because of revalidate() 765 * called by lookup_fast. You can easily make this status 766 * by calling create and lookup concurrently 767 * In such case, we reuse an alias instead of new dentry 768 */ 769 if (d_unhashed(alias)) { 770 WARN_ON(alias->d_name.hash_len != 771 dentry->d_name.hash_len); 772 exfat_info(sb, "rehashed a dentry(%p) in read lookup", 773 alias); 774 d_drop(dentry); 775 d_rehash(alias); 776 } else if (!S_ISDIR(i_mode)) { 777 /* 778 * This inode has non anonymous-DCACHE_DISCONNECTED 779 * dentry. This means, the user did ->lookup() by an 780 * another name (longname vs 8.3 alias of it) in past. 781 * 782 * Switch to new one for reason of locality if possible. 783 */ 784 d_move(alias, dentry); 785 } 786 iput(inode); 787 mutex_unlock(&EXFAT_SB(sb)->s_lock); 788 return alias; 789 } 790 dput(alias); 791 out: 792 mutex_unlock(&EXFAT_SB(sb)->s_lock); 793 if (!inode) 794 exfat_d_version_set(dentry, inode_query_iversion(dir)); 795 796 return d_splice_alias(inode, dentry); 797 unlock: 798 mutex_unlock(&EXFAT_SB(sb)->s_lock); 799 return ERR_PTR(err); 800 } 801 802 /* remove an entry, BUT don't truncate */ 803 static int exfat_unlink(struct inode *dir, struct dentry *dentry) 804 { 805 struct exfat_chain cdir; 806 struct super_block *sb = dir->i_sb; 807 struct inode *inode = dentry->d_inode; 808 struct exfat_inode_info *ei = EXFAT_I(inode); 809 struct exfat_entry_set_cache es; 810 int entry, err = 0; 811 812 mutex_lock(&EXFAT_SB(sb)->s_lock); 813 exfat_chain_dup(&cdir, &ei->dir); 814 entry = ei->entry; 815 if (ei->dir.dir == DIR_DELETED) { 816 exfat_err(sb, "abnormal access to deleted dentry"); 817 err = -ENOENT; 818 goto unlock; 819 } 820 821 err = exfat_get_dentry_set(&es, sb, &cdir, entry, ES_ALL_ENTRIES); 822 if (err) { 823 err = -EIO; 824 goto unlock; 825 } 826 827 exfat_set_volume_dirty(sb); 828 829 /* update the directory entry */ 830 exfat_remove_entries(inode, &es, ES_IDX_FILE); 831 832 err = exfat_put_dentry_set(&es, IS_DIRSYNC(inode)); 833 if (err) 834 goto unlock; 835 836 /* This doesn't modify ei */ 837 ei->dir.dir = DIR_DELETED; 838 839 inode_inc_iversion(dir); 840 simple_inode_init_ts(dir); 841 exfat_truncate_inode_atime(dir); 842 if (IS_DIRSYNC(dir)) 843 exfat_sync_inode(dir); 844 else 845 mark_inode_dirty(dir); 846 847 clear_nlink(inode); 848 simple_inode_init_ts(inode); 849 exfat_truncate_inode_atime(inode); 850 exfat_unhash_inode(inode); 851 exfat_d_version_set(dentry, inode_query_iversion(dir)); 852 unlock: 853 mutex_unlock(&EXFAT_SB(sb)->s_lock); 854 return err; 855 } 856 857 static int exfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, 858 struct dentry *dentry, umode_t mode) 859 { 860 struct super_block *sb = dir->i_sb; 861 struct inode *inode; 862 struct exfat_dir_entry info; 863 struct exfat_chain cdir; 864 loff_t i_pos; 865 int err; 866 867 mutex_lock(&EXFAT_SB(sb)->s_lock); 868 exfat_set_volume_dirty(sb); 869 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, 870 &info); 871 if (err) 872 goto unlock; 873 874 inode_inc_iversion(dir); 875 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 876 if (IS_DIRSYNC(dir)) 877 exfat_sync_inode(dir); 878 else 879 mark_inode_dirty(dir); 880 inc_nlink(dir); 881 882 i_pos = exfat_make_i_pos(&info); 883 inode = exfat_build_inode(sb, &info, i_pos); 884 err = PTR_ERR_OR_ZERO(inode); 885 if (err) 886 goto unlock; 887 888 inode_inc_iversion(inode); 889 EXFAT_I(inode)->i_crtime = simple_inode_init_ts(inode); 890 exfat_truncate_inode_atime(inode); 891 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 892 893 d_instantiate(dentry, inode); 894 895 unlock: 896 mutex_unlock(&EXFAT_SB(sb)->s_lock); 897 return err; 898 } 899 900 static int exfat_check_dir_empty(struct super_block *sb, 901 struct exfat_chain *p_dir) 902 { 903 int i, dentries_per_clu; 904 unsigned int type; 905 struct exfat_chain clu; 906 struct exfat_dentry *ep; 907 struct exfat_sb_info *sbi = EXFAT_SB(sb); 908 struct buffer_head *bh; 909 910 dentries_per_clu = sbi->dentries_per_clu; 911 912 if (p_dir->dir == EXFAT_EOF_CLUSTER) 913 return 0; 914 915 exfat_chain_dup(&clu, p_dir); 916 917 while (clu.dir != EXFAT_EOF_CLUSTER) { 918 for (i = 0; i < dentries_per_clu; i++) { 919 ep = exfat_get_dentry(sb, &clu, i, &bh); 920 if (!ep) 921 return -EIO; 922 type = exfat_get_entry_type(ep); 923 brelse(bh); 924 if (type == TYPE_UNUSED) 925 return 0; 926 927 if (type != TYPE_FILE && type != TYPE_DIR) 928 continue; 929 930 return -ENOTEMPTY; 931 } 932 933 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 934 if (--clu.size > 0) 935 clu.dir++; 936 else 937 clu.dir = EXFAT_EOF_CLUSTER; 938 } else { 939 if (exfat_get_next_cluster(sb, &(clu.dir))) 940 return -EIO; 941 } 942 } 943 944 return 0; 945 } 946 947 static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 948 { 949 struct inode *inode = dentry->d_inode; 950 struct exfat_chain cdir, clu_to_free; 951 struct super_block *sb = inode->i_sb; 952 struct exfat_sb_info *sbi = EXFAT_SB(sb); 953 struct exfat_inode_info *ei = EXFAT_I(inode); 954 struct exfat_entry_set_cache es; 955 int entry, err; 956 957 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 958 959 exfat_chain_dup(&cdir, &ei->dir); 960 entry = ei->entry; 961 962 if (ei->dir.dir == DIR_DELETED) { 963 exfat_err(sb, "abnormal access to deleted dentry"); 964 err = -ENOENT; 965 goto unlock; 966 } 967 968 exfat_chain_set(&clu_to_free, ei->start_clu, 969 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); 970 971 err = exfat_check_dir_empty(sb, &clu_to_free); 972 if (err) { 973 if (err == -EIO) 974 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 975 err); 976 goto unlock; 977 } 978 979 err = exfat_get_dentry_set(&es, sb, &cdir, entry, ES_ALL_ENTRIES); 980 if (err) { 981 err = -EIO; 982 goto unlock; 983 } 984 985 exfat_set_volume_dirty(sb); 986 987 exfat_remove_entries(inode, &es, ES_IDX_FILE); 988 989 err = exfat_put_dentry_set(&es, IS_DIRSYNC(dir)); 990 if (err) 991 goto unlock; 992 993 ei->dir.dir = DIR_DELETED; 994 995 inode_inc_iversion(dir); 996 simple_inode_init_ts(dir); 997 exfat_truncate_inode_atime(dir); 998 if (IS_DIRSYNC(dir)) 999 exfat_sync_inode(dir); 1000 else 1001 mark_inode_dirty(dir); 1002 drop_nlink(dir); 1003 1004 clear_nlink(inode); 1005 simple_inode_init_ts(inode); 1006 exfat_truncate_inode_atime(inode); 1007 exfat_unhash_inode(inode); 1008 exfat_d_version_set(dentry, inode_query_iversion(dir)); 1009 unlock: 1010 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 1011 return err; 1012 } 1013 1014 static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir, 1015 int oldentry, struct exfat_uni_name *p_uniname, 1016 struct exfat_inode_info *ei) 1017 { 1018 int ret, num_new_entries; 1019 struct exfat_dentry *epold, *epnew; 1020 struct super_block *sb = inode->i_sb; 1021 struct buffer_head *new_bh; 1022 struct exfat_entry_set_cache old_es; 1023 int sync = IS_DIRSYNC(inode); 1024 1025 num_new_entries = exfat_calc_num_entries(p_uniname); 1026 if (num_new_entries < 0) 1027 return num_new_entries; 1028 1029 ret = exfat_get_dentry_set(&old_es, sb, p_dir, oldentry, ES_ALL_ENTRIES); 1030 if (ret) { 1031 ret = -EIO; 1032 return ret; 1033 } 1034 1035 epold = exfat_get_dentry_cached(&old_es, ES_IDX_FILE); 1036 1037 if (old_es.num_entries < num_new_entries) { 1038 int newentry; 1039 1040 newentry = 1041 exfat_find_empty_entry(inode, p_dir, num_new_entries); 1042 if (newentry < 0) { 1043 ret = newentry; /* -EIO or -ENOSPC */ 1044 goto put_old_es; 1045 } 1046 1047 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh); 1048 if (!epnew) { 1049 ret = -EIO; 1050 goto put_old_es; 1051 } 1052 1053 *epnew = *epold; 1054 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1055 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1056 ei->attr |= EXFAT_ATTR_ARCHIVE; 1057 } 1058 exfat_update_bh(new_bh, sync); 1059 brelse(new_bh); 1060 1061 epold = exfat_get_dentry_cached(&old_es, ES_IDX_STREAM); 1062 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh); 1063 if (!epnew) { 1064 ret = -EIO; 1065 goto put_old_es; 1066 } 1067 1068 *epnew = *epold; 1069 exfat_update_bh(new_bh, sync); 1070 brelse(new_bh); 1071 1072 ret = exfat_init_ext_entry(inode, p_dir, newentry, 1073 num_new_entries, p_uniname); 1074 if (ret) 1075 goto put_old_es; 1076 1077 exfat_remove_entries(inode, &old_es, ES_IDX_FILE); 1078 ei->dir = *p_dir; 1079 ei->entry = newentry; 1080 } else { 1081 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1082 epold->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1083 ei->attr |= EXFAT_ATTR_ARCHIVE; 1084 } 1085 ret = exfat_init_ext_entry(inode, p_dir, oldentry, 1086 num_new_entries, p_uniname); 1087 if (ret) 1088 goto put_old_es; 1089 1090 exfat_remove_entries(inode, &old_es, num_new_entries); 1091 } 1092 return exfat_put_dentry_set(&old_es, sync); 1093 1094 put_old_es: 1095 exfat_put_dentry_set(&old_es, false); 1096 return ret; 1097 } 1098 1099 static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, 1100 int oldentry, struct exfat_chain *p_newdir, 1101 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1102 { 1103 int ret, newentry, num_new_entries; 1104 struct exfat_dentry *epmov, *epnew; 1105 struct super_block *sb = inode->i_sb; 1106 struct buffer_head *new_bh; 1107 struct exfat_entry_set_cache mov_es; 1108 1109 num_new_entries = exfat_calc_num_entries(p_uniname); 1110 if (num_new_entries < 0) 1111 return num_new_entries; 1112 1113 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); 1114 if (newentry < 0) 1115 return newentry; /* -EIO or -ENOSPC */ 1116 1117 ret = exfat_get_dentry_set(&mov_es, sb, p_olddir, oldentry, 1118 ES_ALL_ENTRIES); 1119 if (ret) 1120 return -EIO; 1121 1122 epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_FILE); 1123 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh); 1124 if (!epnew) { 1125 ret = -EIO; 1126 goto put_mov_es; 1127 } 1128 1129 *epnew = *epmov; 1130 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1131 epnew->dentry.file.attr |= cpu_to_le16(EXFAT_ATTR_ARCHIVE); 1132 ei->attr |= EXFAT_ATTR_ARCHIVE; 1133 } 1134 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1135 brelse(new_bh); 1136 1137 epmov = exfat_get_dentry_cached(&mov_es, ES_IDX_STREAM); 1138 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh); 1139 if (!epnew) { 1140 ret = -EIO; 1141 goto put_mov_es; 1142 } 1143 1144 *epnew = *epmov; 1145 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1146 brelse(new_bh); 1147 1148 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, 1149 p_uniname); 1150 if (ret) 1151 return ret; 1152 1153 exfat_remove_entries(inode, &mov_es, ES_IDX_FILE); 1154 1155 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, 1156 p_newdir->flags); 1157 1158 ei->entry = newentry; 1159 return exfat_put_dentry_set(&mov_es, IS_DIRSYNC(inode)); 1160 1161 put_mov_es: 1162 exfat_put_dentry_set(&mov_es, false); 1163 1164 return ret; 1165 } 1166 1167 /* rename or move a old file into a new file */ 1168 static int __exfat_rename(struct inode *old_parent_inode, 1169 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1170 struct dentry *new_dentry) 1171 { 1172 int ret; 1173 int dentry; 1174 struct exfat_chain olddir, newdir; 1175 struct exfat_chain *p_dir = NULL; 1176 struct exfat_uni_name uni_name; 1177 struct exfat_dentry *ep; 1178 struct super_block *sb = old_parent_inode->i_sb; 1179 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1180 const unsigned char *new_path = new_dentry->d_name.name; 1181 struct inode *new_inode = new_dentry->d_inode; 1182 struct exfat_inode_info *new_ei = NULL; 1183 unsigned int new_entry_type = TYPE_UNUSED; 1184 int new_entry = 0; 1185 struct buffer_head *new_bh = NULL; 1186 1187 /* check the validity of pointer parameters */ 1188 if (new_path == NULL || strlen(new_path) == 0) 1189 return -EINVAL; 1190 1191 if (ei->dir.dir == DIR_DELETED) { 1192 exfat_err(sb, "abnormal access to deleted source dentry"); 1193 return -ENOENT; 1194 } 1195 1196 exfat_chain_set(&olddir, EXFAT_I(old_parent_inode)->start_clu, 1197 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(old_parent_inode), sbi), 1198 EXFAT_I(old_parent_inode)->flags); 1199 dentry = ei->entry; 1200 1201 /* check whether new dir is existing directory and empty */ 1202 if (new_inode) { 1203 ret = -EIO; 1204 new_ei = EXFAT_I(new_inode); 1205 1206 if (new_ei->dir.dir == DIR_DELETED) { 1207 exfat_err(sb, "abnormal access to deleted target dentry"); 1208 goto out; 1209 } 1210 1211 p_dir = &(new_ei->dir); 1212 new_entry = new_ei->entry; 1213 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh); 1214 if (!ep) 1215 goto out; 1216 1217 new_entry_type = exfat_get_entry_type(ep); 1218 brelse(new_bh); 1219 1220 /* if new_inode exists, update ei */ 1221 if (new_entry_type == TYPE_DIR) { 1222 struct exfat_chain new_clu; 1223 1224 new_clu.dir = new_ei->start_clu; 1225 new_clu.size = 1226 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1227 sbi); 1228 new_clu.flags = new_ei->flags; 1229 1230 ret = exfat_check_dir_empty(sb, &new_clu); 1231 if (ret) 1232 goto out; 1233 } 1234 } 1235 1236 /* check the validity of directory name in the given new pathname */ 1237 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, 1238 &uni_name); 1239 if (ret) 1240 goto out; 1241 1242 exfat_set_volume_dirty(sb); 1243 1244 if (olddir.dir == newdir.dir) 1245 ret = exfat_rename_file(new_parent_inode, &olddir, dentry, 1246 &uni_name, ei); 1247 else 1248 ret = exfat_move_file(new_parent_inode, &olddir, dentry, 1249 &newdir, &uni_name, ei); 1250 1251 if (!ret && new_inode) { 1252 struct exfat_entry_set_cache es; 1253 1254 /* delete entries of new_dir */ 1255 ret = exfat_get_dentry_set(&es, sb, p_dir, new_entry, 1256 ES_ALL_ENTRIES); 1257 if (ret) { 1258 ret = -EIO; 1259 goto del_out; 1260 } 1261 1262 exfat_remove_entries(new_inode, &es, ES_IDX_FILE); 1263 1264 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(new_inode)); 1265 if (ret) 1266 goto del_out; 1267 1268 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1269 if (new_entry_type == TYPE_DIR && 1270 new_ei->start_clu != EXFAT_EOF_CLUSTER) { 1271 /* new_ei, new_clu_to_free */ 1272 struct exfat_chain new_clu_to_free; 1273 1274 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1275 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1276 sbi), new_ei->flags); 1277 1278 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1279 /* just set I/O error only */ 1280 ret = -EIO; 1281 } 1282 1283 i_size_write(new_inode, 0); 1284 new_ei->valid_size = 0; 1285 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1286 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1287 } 1288 del_out: 1289 /* Update new_inode ei 1290 * Prevent syncing removed new_inode 1291 * (new_ei is already initialized above code ("if (new_inode)") 1292 */ 1293 new_ei->dir.dir = DIR_DELETED; 1294 } 1295 out: 1296 return ret; 1297 } 1298 1299 static int exfat_rename(struct mnt_idmap *idmap, 1300 struct inode *old_dir, struct dentry *old_dentry, 1301 struct inode *new_dir, struct dentry *new_dentry, 1302 unsigned int flags) 1303 { 1304 struct inode *old_inode, *new_inode; 1305 struct super_block *sb = old_dir->i_sb; 1306 loff_t i_pos; 1307 int err; 1308 1309 /* 1310 * The VFS already checks for existence, so for local filesystems 1311 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1312 * Don't support any other flags 1313 */ 1314 if (flags & ~RENAME_NOREPLACE) 1315 return -EINVAL; 1316 1317 mutex_lock(&EXFAT_SB(sb)->s_lock); 1318 old_inode = old_dentry->d_inode; 1319 new_inode = new_dentry->d_inode; 1320 1321 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1322 if (err) 1323 goto unlock; 1324 1325 inode_inc_iversion(new_dir); 1326 simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry); 1327 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1328 exfat_truncate_inode_atime(new_dir); 1329 if (IS_DIRSYNC(new_dir)) 1330 exfat_sync_inode(new_dir); 1331 else 1332 mark_inode_dirty(new_dir); 1333 1334 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1335 (EXFAT_I(old_inode)->entry & 0xffffffff); 1336 exfat_unhash_inode(old_inode); 1337 exfat_hash_inode(old_inode, i_pos); 1338 if (IS_DIRSYNC(new_dir)) 1339 exfat_sync_inode(old_inode); 1340 else 1341 mark_inode_dirty(old_inode); 1342 1343 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1344 drop_nlink(old_dir); 1345 if (!new_inode) 1346 inc_nlink(new_dir); 1347 } 1348 1349 inode_inc_iversion(old_dir); 1350 if (IS_DIRSYNC(old_dir)) 1351 exfat_sync_inode(old_dir); 1352 else 1353 mark_inode_dirty(old_dir); 1354 1355 if (new_inode) { 1356 exfat_unhash_inode(new_inode); 1357 1358 /* skip drop_nlink if new_inode already has been dropped */ 1359 if (new_inode->i_nlink) { 1360 drop_nlink(new_inode); 1361 if (S_ISDIR(new_inode->i_mode)) 1362 drop_nlink(new_inode); 1363 } else { 1364 exfat_warn(sb, "abnormal access to an inode dropped"); 1365 WARN_ON(new_inode->i_nlink == 0); 1366 } 1367 EXFAT_I(new_inode)->i_crtime = current_time(new_inode); 1368 } 1369 1370 unlock: 1371 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1372 return err; 1373 } 1374 1375 const struct inode_operations exfat_dir_inode_operations = { 1376 .create = exfat_create, 1377 .lookup = exfat_lookup, 1378 .unlink = exfat_unlink, 1379 .mkdir = exfat_mkdir, 1380 .rmdir = exfat_rmdir, 1381 .rename = exfat_rename, 1382 .setattr = exfat_setattr, 1383 .getattr = exfat_getattr, 1384 }; 1385