1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. 4 */ 5 6#include <linux/iversion.h> 7#include <linux/namei.h> 8#include <linux/slab.h> 9#include <linux/buffer_head.h> 10#include <linux/nls.h> 11 12#include "exfat_raw.h" 13#include "exfat_fs.h" 14 15static inline unsigned long exfat_d_version(struct dentry *dentry) 16{ 17 return (unsigned long) dentry->d_fsdata; 18} 19 20static inline void exfat_d_version_set(struct dentry *dentry, 21 unsigned long version) 22{ 23 dentry->d_fsdata = (void *) version; 24} 25 26/* 27 * If new entry was created in the parent, it could create the 8.3 alias (the 28 * shortname of logname). So, the parent may have the negative-dentry which 29 * matches the created 8.3 alias. 30 * 31 * If it happened, the negative dentry isn't actually negative anymore. So, 32 * drop it. 33 */ 34static int exfat_d_revalidate(struct dentry *dentry, unsigned int flags) 35{ 36 int ret; 37 38 if (flags & LOOKUP_RCU) 39 return -ECHILD; 40 41 /* 42 * This is not negative dentry. Always valid. 43 * 44 * Note, rename() to existing directory entry will have ->d_inode, and 45 * will use existing name which isn't specified name by user. 46 * 47 * We may be able to drop this positive dentry here. But dropping 48 * positive dentry isn't good idea. So it's unsupported like 49 * rename("filename", "FILENAME") for now. 50 */ 51 if (d_really_is_positive(dentry)) 52 return 1; 53 54 /* 55 * Drop the negative dentry, in order to make sure to use the case 56 * sensitive name which is specified by user if this is for creation. 57 */ 58 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 59 return 0; 60 61 spin_lock(&dentry->d_lock); 62 ret = inode_eq_iversion(d_inode(dentry->d_parent), 63 exfat_d_version(dentry)); 64 spin_unlock(&dentry->d_lock); 65 return ret; 66} 67 68/* returns the length of a struct qstr, ignoring trailing dots */ 69static unsigned int exfat_striptail_len(unsigned int len, const char *name) 70{ 71 while (len && name[len - 1] == '.') 72 len--; 73 return len; 74} 75 76/* 77 * Compute the hash for the exfat name corresponding to the dentry. If the name 78 * is invalid, we leave the hash code unchanged so that the existing dentry can 79 * be used. The exfat fs routines will return ENOENT or EINVAL as appropriate. 80 */ 81static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) 82{ 83 struct super_block *sb = dentry->d_sb; 84 struct nls_table *t = EXFAT_SB(sb)->nls_io; 85 const unsigned char *name = qstr->name; 86 unsigned int len = exfat_striptail_len(qstr->len, qstr->name); 87 unsigned long hash = init_name_hash(dentry); 88 int i, charlen; 89 wchar_t c; 90 91 for (i = 0; i < len; i += charlen) { 92 charlen = t->char2uni(&name[i], len - i, &c); 93 if (charlen < 0) 94 return charlen; 95 hash = partial_name_hash(exfat_toupper(sb, c), hash); 96 } 97 98 qstr->hash = end_name_hash(hash); 99 return 0; 100} 101 102static int exfat_d_cmp(const struct dentry *dentry, unsigned int len, 103 const char *str, const struct qstr *name) 104{ 105 struct super_block *sb = dentry->d_sb; 106 struct nls_table *t = EXFAT_SB(sb)->nls_io; 107 unsigned int alen = exfat_striptail_len(name->len, name->name); 108 unsigned int blen = exfat_striptail_len(len, str); 109 wchar_t c1, c2; 110 int charlen, i; 111 112 if (alen != blen) 113 return 1; 114 115 for (i = 0; i < len; i += charlen) { 116 charlen = t->char2uni(&name->name[i], alen - i, &c1); 117 if (charlen < 0) 118 return 1; 119 if (charlen != t->char2uni(&str[i], blen - i, &c2)) 120 return 1; 121 122 if (exfat_toupper(sb, c1) != exfat_toupper(sb, c2)) 123 return 1; 124 } 125 126 return 0; 127} 128 129const struct dentry_operations exfat_dentry_ops = { 130 .d_revalidate = exfat_d_revalidate, 131 .d_hash = exfat_d_hash, 132 .d_compare = exfat_d_cmp, 133}; 134 135static int exfat_utf8_d_hash(const struct dentry *dentry, struct qstr *qstr) 136{ 137 struct super_block *sb = dentry->d_sb; 138 const unsigned char *name = qstr->name; 139 unsigned int len = exfat_striptail_len(qstr->len, qstr->name); 140 unsigned long hash = init_name_hash(dentry); 141 int i, charlen; 142 unicode_t u; 143 144 for (i = 0; i < len; i += charlen) { 145 charlen = utf8_to_utf32(&name[i], len - i, &u); 146 if (charlen < 0) 147 return charlen; 148 149 /* 150 * exfat_toupper() works only for code points up to the U+FFFF. 151 */ 152 hash = partial_name_hash(u <= 0xFFFF ? exfat_toupper(sb, u) : u, 153 hash); 154 } 155 156 qstr->hash = end_name_hash(hash); 157 return 0; 158} 159 160static int exfat_utf8_d_cmp(const struct dentry *dentry, unsigned int len, 161 const char *str, const struct qstr *name) 162{ 163 struct super_block *sb = dentry->d_sb; 164 unsigned int alen = exfat_striptail_len(name->len, name->name); 165 unsigned int blen = exfat_striptail_len(len, str); 166 unicode_t u_a, u_b; 167 int charlen, i; 168 169 if (alen != blen) 170 return 1; 171 172 for (i = 0; i < alen; i += charlen) { 173 charlen = utf8_to_utf32(&name->name[i], alen - i, &u_a); 174 if (charlen < 0) 175 return 1; 176 if (charlen != utf8_to_utf32(&str[i], blen - i, &u_b)) 177 return 1; 178 179 if (u_a <= 0xFFFF && u_b <= 0xFFFF) { 180 if (exfat_toupper(sb, u_a) != exfat_toupper(sb, u_b)) 181 return 1; 182 } else { 183 if (u_a != u_b) 184 return 1; 185 } 186 } 187 188 return 0; 189} 190 191const struct dentry_operations exfat_utf8_dentry_ops = { 192 .d_revalidate = exfat_d_revalidate, 193 .d_hash = exfat_utf8_d_hash, 194 .d_compare = exfat_utf8_d_cmp, 195}; 196 197/* used only in search empty_slot() */ 198#define CNT_UNUSED_NOHIT (-1) 199#define CNT_UNUSED_HIT (-2) 200/* search EMPTY CONTINUOUS "num_entries" entries */ 201static int exfat_search_empty_slot(struct super_block *sb, 202 struct exfat_hint_femp *hint_femp, struct exfat_chain *p_dir, 203 int num_entries) 204{ 205 int i, dentry, num_empty = 0; 206 int dentries_per_clu; 207 unsigned int type; 208 struct exfat_chain clu; 209 struct exfat_dentry *ep; 210 struct exfat_sb_info *sbi = EXFAT_SB(sb); 211 struct buffer_head *bh; 212 213 dentries_per_clu = sbi->dentries_per_clu; 214 215 if (hint_femp->eidx != EXFAT_HINT_NONE) { 216 dentry = hint_femp->eidx; 217 if (num_entries <= hint_femp->count) { 218 hint_femp->eidx = EXFAT_HINT_NONE; 219 return dentry; 220 } 221 222 exfat_chain_dup(&clu, &hint_femp->cur); 223 } else { 224 exfat_chain_dup(&clu, p_dir); 225 dentry = 0; 226 } 227 228 while (clu.dir != EXFAT_EOF_CLUSTER) { 229 i = dentry & (dentries_per_clu - 1); 230 231 for (; i < dentries_per_clu; i++, dentry++) { 232 ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); 233 if (!ep) 234 return -EIO; 235 type = exfat_get_entry_type(ep); 236 brelse(bh); 237 238 if (type == TYPE_UNUSED || type == TYPE_DELETED) { 239 num_empty++; 240 if (hint_femp->eidx == EXFAT_HINT_NONE) { 241 hint_femp->eidx = dentry; 242 hint_femp->count = CNT_UNUSED_NOHIT; 243 exfat_chain_set(&hint_femp->cur, 244 clu.dir, clu.size, clu.flags); 245 } 246 247 if (type == TYPE_UNUSED && 248 hint_femp->count != CNT_UNUSED_HIT) 249 hint_femp->count = CNT_UNUSED_HIT; 250 } else { 251 if (hint_femp->eidx != EXFAT_HINT_NONE && 252 hint_femp->count == CNT_UNUSED_HIT) { 253 /* unused empty group means 254 * an empty group which includes 255 * unused dentry 256 */ 257 exfat_fs_error(sb, 258 "found bogus dentry(%d) beyond unused empty group(%d) (start_clu : %u, cur_clu : %u)", 259 dentry, hint_femp->eidx, 260 p_dir->dir, clu.dir); 261 return -EIO; 262 } 263 264 num_empty = 0; 265 hint_femp->eidx = EXFAT_HINT_NONE; 266 } 267 268 if (num_empty >= num_entries) { 269 /* found and invalidate hint_femp */ 270 hint_femp->eidx = EXFAT_HINT_NONE; 271 return (dentry - (num_entries - 1)); 272 } 273 } 274 275 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 276 if (--clu.size > 0) 277 clu.dir++; 278 else 279 clu.dir = EXFAT_EOF_CLUSTER; 280 } else { 281 if (exfat_get_next_cluster(sb, &clu.dir)) 282 return -EIO; 283 } 284 } 285 286 return -ENOSPC; 287} 288 289static int exfat_check_max_dentries(struct inode *inode) 290{ 291 if (EXFAT_B_TO_DEN(i_size_read(inode)) >= MAX_EXFAT_DENTRIES) { 292 /* 293 * exFAT spec allows a dir to grow up to 8388608(256MB) 294 * dentries 295 */ 296 return -ENOSPC; 297 } 298 return 0; 299} 300 301/* find empty directory entry. 302 * if there isn't any empty slot, expand cluster chain. 303 */ 304static int exfat_find_empty_entry(struct inode *inode, 305 struct exfat_chain *p_dir, int num_entries) 306{ 307 int dentry; 308 unsigned int ret, last_clu; 309 sector_t sector; 310 loff_t size = 0; 311 struct exfat_chain clu; 312 struct exfat_dentry *ep = NULL; 313 struct super_block *sb = inode->i_sb; 314 struct exfat_sb_info *sbi = EXFAT_SB(sb); 315 struct exfat_inode_info *ei = EXFAT_I(inode); 316 struct exfat_hint_femp hint_femp; 317 318 hint_femp.eidx = EXFAT_HINT_NONE; 319 320 if (ei->hint_femp.eidx != EXFAT_HINT_NONE) { 321 hint_femp = ei->hint_femp; 322 ei->hint_femp.eidx = EXFAT_HINT_NONE; 323 } 324 325 while ((dentry = exfat_search_empty_slot(sb, &hint_femp, p_dir, 326 num_entries)) < 0) { 327 if (dentry == -EIO) 328 break; 329 330 if (exfat_check_max_dentries(inode)) 331 return -ENOSPC; 332 333 /* 334 * Allocate new cluster to this directory 335 */ 336 if (ei->start_clu != EXFAT_EOF_CLUSTER) { 337 /* we trust p_dir->size regardless of FAT type */ 338 if (exfat_find_last_cluster(sb, p_dir, &last_clu)) 339 return -EIO; 340 341 exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); 342 } else { 343 /* This directory is empty */ 344 exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0, 345 ALLOC_NO_FAT_CHAIN); 346 } 347 348 /* allocate a cluster */ 349 ret = exfat_alloc_cluster(inode, 1, &clu); 350 if (ret) 351 return ret; 352 353 if (exfat_zeroed_cluster(inode, clu.dir)) 354 return -EIO; 355 356 if (ei->start_clu == EXFAT_EOF_CLUSTER) { 357 ei->start_clu = clu.dir; 358 p_dir->dir = clu.dir; 359 } 360 361 /* append to the FAT chain */ 362 if (clu.flags != p_dir->flags) { 363 /* no-fat-chain bit is disabled, 364 * so fat-chain should be synced with alloc-bitmap 365 */ 366 exfat_chain_cont_cluster(sb, p_dir->dir, p_dir->size); 367 p_dir->flags = ALLOC_FAT_CHAIN; 368 hint_femp.cur.flags = ALLOC_FAT_CHAIN; 369 } 370 371 if (clu.flags == ALLOC_FAT_CHAIN) 372 if (exfat_ent_set(sb, last_clu, clu.dir)) 373 return -EIO; 374 375 if (hint_femp.eidx == EXFAT_HINT_NONE) { 376 /* the special case that new dentry 377 * should be allocated from the start of new cluster 378 */ 379 hint_femp.eidx = EXFAT_B_TO_DEN_IDX(p_dir->size, sbi); 380 hint_femp.count = sbi->dentries_per_clu; 381 382 exfat_chain_set(&hint_femp.cur, clu.dir, 0, clu.flags); 383 } 384 hint_femp.cur.size++; 385 p_dir->size++; 386 size = EXFAT_CLU_TO_B(p_dir->size, sbi); 387 388 /* update the directory entry */ 389 if (p_dir->dir != sbi->root_dir) { 390 struct buffer_head *bh; 391 392 ep = exfat_get_dentry(sb, 393 &(ei->dir), ei->entry + 1, &bh, §or); 394 if (!ep) 395 return -EIO; 396 397 ep->dentry.stream.valid_size = cpu_to_le64(size); 398 ep->dentry.stream.size = ep->dentry.stream.valid_size; 399 ep->dentry.stream.flags = p_dir->flags; 400 exfat_update_bh(bh, IS_DIRSYNC(inode)); 401 brelse(bh); 402 if (exfat_update_dir_chksum(inode, &(ei->dir), 403 ei->entry)) 404 return -EIO; 405 } 406 407 /* directory inode should be updated in here */ 408 i_size_write(inode, size); 409 ei->i_size_ondisk += sbi->cluster_size; 410 ei->i_size_aligned += sbi->cluster_size; 411 ei->flags = p_dir->flags; 412 inode->i_blocks += sbi->cluster_size >> 9; 413 } 414 415 return dentry; 416} 417 418/* 419 * Name Resolution Functions : 420 * Zero if it was successful; otherwise nonzero. 421 */ 422static int __exfat_resolve_path(struct inode *inode, const unsigned char *path, 423 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 424 int lookup) 425{ 426 int namelen; 427 int lossy = NLS_NAME_NO_LOSSY; 428 struct super_block *sb = inode->i_sb; 429 struct exfat_sb_info *sbi = EXFAT_SB(sb); 430 struct exfat_inode_info *ei = EXFAT_I(inode); 431 432 /* strip all trailing periods */ 433 namelen = exfat_striptail_len(strlen(path), path); 434 if (!namelen) 435 return -ENOENT; 436 437 if (strlen(path) > (MAX_NAME_LENGTH * MAX_CHARSET_SIZE)) 438 return -ENAMETOOLONG; 439 440 /* 441 * strip all leading spaces : 442 * "MS windows 7" supports leading spaces. 443 * So we should skip this preprocessing for compatibility. 444 */ 445 446 /* file name conversion : 447 * If lookup case, we allow bad-name for compatibility. 448 */ 449 namelen = exfat_nls_to_utf16(sb, path, namelen, p_uniname, 450 &lossy); 451 if (namelen < 0) 452 return namelen; /* return error value */ 453 454 if ((lossy && !lookup) || !namelen) 455 return -EINVAL; 456 457 exfat_chain_set(p_dir, ei->start_clu, 458 EXFAT_B_TO_CLU(i_size_read(inode), sbi), ei->flags); 459 460 return 0; 461} 462 463static inline int exfat_resolve_path(struct inode *inode, 464 const unsigned char *path, struct exfat_chain *dir, 465 struct exfat_uni_name *uni) 466{ 467 return __exfat_resolve_path(inode, path, dir, uni, 0); 468} 469 470static inline int exfat_resolve_path_for_lookup(struct inode *inode, 471 const unsigned char *path, struct exfat_chain *dir, 472 struct exfat_uni_name *uni) 473{ 474 return __exfat_resolve_path(inode, path, dir, uni, 1); 475} 476 477static inline loff_t exfat_make_i_pos(struct exfat_dir_entry *info) 478{ 479 return ((loff_t) info->dir.dir << 32) | (info->entry & 0xffffffff); 480} 481 482static int exfat_add_entry(struct inode *inode, const char *path, 483 struct exfat_chain *p_dir, unsigned int type, 484 struct exfat_dir_entry *info) 485{ 486 int ret, dentry, num_entries; 487 struct super_block *sb = inode->i_sb; 488 struct exfat_sb_info *sbi = EXFAT_SB(sb); 489 struct exfat_uni_name uniname; 490 struct exfat_chain clu; 491 int clu_size = 0; 492 unsigned int start_clu = EXFAT_FREE_CLUSTER; 493 494 ret = exfat_resolve_path(inode, path, p_dir, &uniname); 495 if (ret) 496 goto out; 497 498 num_entries = exfat_calc_num_entries(&uniname); 499 if (num_entries < 0) { 500 ret = num_entries; 501 goto out; 502 } 503 504 /* exfat_find_empty_entry must be called before alloc_cluster() */ 505 dentry = exfat_find_empty_entry(inode, p_dir, num_entries); 506 if (dentry < 0) { 507 ret = dentry; /* -EIO or -ENOSPC */ 508 goto out; 509 } 510 511 if (type == TYPE_DIR) { 512 ret = exfat_alloc_new_dir(inode, &clu); 513 if (ret) 514 goto out; 515 start_clu = clu.dir; 516 clu_size = sbi->cluster_size; 517 } 518 519 /* update the directory entry */ 520 /* fill the dos name directory entry information of the created file. 521 * the first cluster is not determined yet. (0) 522 */ 523 ret = exfat_init_dir_entry(inode, p_dir, dentry, type, 524 start_clu, clu_size); 525 if (ret) 526 goto out; 527 528 ret = exfat_init_ext_entry(inode, p_dir, dentry, num_entries, &uniname); 529 if (ret) 530 goto out; 531 532 info->dir = *p_dir; 533 info->entry = dentry; 534 info->flags = ALLOC_NO_FAT_CHAIN; 535 info->type = type; 536 537 if (type == TYPE_FILE) { 538 info->attr = ATTR_ARCHIVE; 539 info->start_clu = EXFAT_EOF_CLUSTER; 540 info->size = 0; 541 info->num_subdirs = 0; 542 } else { 543 info->attr = ATTR_SUBDIR; 544 info->start_clu = start_clu; 545 info->size = clu_size; 546 info->num_subdirs = EXFAT_MIN_SUBDIR; 547 } 548 memset(&info->crtime, 0, sizeof(info->crtime)); 549 memset(&info->mtime, 0, sizeof(info->mtime)); 550 memset(&info->atime, 0, sizeof(info->atime)); 551out: 552 return ret; 553} 554 555static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, 556 bool excl) 557{ 558 struct super_block *sb = dir->i_sb; 559 struct inode *inode; 560 struct exfat_chain cdir; 561 struct exfat_dir_entry info; 562 loff_t i_pos; 563 int err; 564 565 mutex_lock(&EXFAT_SB(sb)->s_lock); 566 exfat_set_volume_dirty(sb); 567 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_FILE, 568 &info); 569 exfat_clear_volume_dirty(sb); 570 if (err) 571 goto unlock; 572 573 inode_inc_iversion(dir); 574 dir->i_ctime = dir->i_mtime = current_time(dir); 575 if (IS_DIRSYNC(dir)) 576 exfat_sync_inode(dir); 577 else 578 mark_inode_dirty(dir); 579 580 i_pos = exfat_make_i_pos(&info); 581 inode = exfat_build_inode(sb, &info, i_pos); 582 err = PTR_ERR_OR_ZERO(inode); 583 if (err) 584 goto unlock; 585 586 inode_inc_iversion(inode); 587 inode->i_mtime = inode->i_atime = inode->i_ctime = 588 EXFAT_I(inode)->i_crtime = current_time(inode); 589 exfat_truncate_atime(&inode->i_atime); 590 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 591 592 d_instantiate(dentry, inode); 593unlock: 594 mutex_unlock(&EXFAT_SB(sb)->s_lock); 595 return err; 596} 597 598/* lookup a file */ 599static int exfat_find(struct inode *dir, struct qstr *qname, 600 struct exfat_dir_entry *info) 601{ 602 int ret, dentry, num_entries, count; 603 struct exfat_chain cdir; 604 struct exfat_uni_name uni_name; 605 struct super_block *sb = dir->i_sb; 606 struct exfat_sb_info *sbi = EXFAT_SB(sb); 607 struct exfat_inode_info *ei = EXFAT_I(dir); 608 struct exfat_dentry *ep, *ep2; 609 struct exfat_entry_set_cache *es; 610 /* for optimized dir & entry to prevent long traverse of cluster chain */ 611 struct exfat_hint hint_opt; 612 613 if (qname->len == 0) 614 return -ENOENT; 615 616 /* check the validity of directory name in the given pathname */ 617 ret = exfat_resolve_path_for_lookup(dir, qname->name, &cdir, &uni_name); 618 if (ret) 619 return ret; 620 621 num_entries = exfat_calc_num_entries(&uni_name); 622 if (num_entries < 0) 623 return num_entries; 624 625 /* check the validation of hint_stat and initialize it if required */ 626 if (ei->version != (inode_peek_iversion_raw(dir) & 0xffffffff)) { 627 ei->hint_stat.clu = cdir.dir; 628 ei->hint_stat.eidx = 0; 629 ei->version = (inode_peek_iversion_raw(dir) & 0xffffffff); 630 ei->hint_femp.eidx = EXFAT_HINT_NONE; 631 } 632 633 /* search the file name for directories */ 634 dentry = exfat_find_dir_entry(sb, ei, &cdir, &uni_name, 635 num_entries, TYPE_ALL, &hint_opt); 636 637 if (dentry < 0) 638 return dentry; /* -error value */ 639 640 info->dir = cdir; 641 info->entry = dentry; 642 info->num_subdirs = 0; 643 644 /* adjust cdir to the optimized value */ 645 cdir.dir = hint_opt.clu; 646 if (cdir.flags & ALLOC_NO_FAT_CHAIN) 647 cdir.size -= dentry / sbi->dentries_per_clu; 648 dentry = hint_opt.eidx; 649 es = exfat_get_dentry_set(sb, &cdir, dentry, ES_2_ENTRIES); 650 if (!es) 651 return -EIO; 652 ep = exfat_get_dentry_cached(es, 0); 653 ep2 = exfat_get_dentry_cached(es, 1); 654 655 info->type = exfat_get_entry_type(ep); 656 info->attr = le16_to_cpu(ep->dentry.file.attr); 657 info->size = le64_to_cpu(ep2->dentry.stream.valid_size); 658 if (info->size == 0) { 659 info->flags = ALLOC_NO_FAT_CHAIN; 660 info->start_clu = EXFAT_EOF_CLUSTER; 661 } else { 662 info->flags = ep2->dentry.stream.flags; 663 info->start_clu = 664 le32_to_cpu(ep2->dentry.stream.start_clu); 665 } 666 667 exfat_get_entry_time(sbi, &info->crtime, 668 ep->dentry.file.create_tz, 669 ep->dentry.file.create_time, 670 ep->dentry.file.create_date, 671 ep->dentry.file.create_time_cs); 672 exfat_get_entry_time(sbi, &info->mtime, 673 ep->dentry.file.modify_tz, 674 ep->dentry.file.modify_time, 675 ep->dentry.file.modify_date, 676 ep->dentry.file.modify_time_cs); 677 exfat_get_entry_time(sbi, &info->atime, 678 ep->dentry.file.access_tz, 679 ep->dentry.file.access_time, 680 ep->dentry.file.access_date, 681 0); 682 exfat_free_dentry_set(es, false); 683 684 if (ei->start_clu == EXFAT_FREE_CLUSTER) { 685 exfat_fs_error(sb, 686 "non-zero size file starts with zero cluster (size : %llu, p_dir : %u, entry : 0x%08x)", 687 i_size_read(dir), ei->dir.dir, ei->entry); 688 return -EIO; 689 } 690 691 if (info->type == TYPE_DIR) { 692 exfat_chain_set(&cdir, info->start_clu, 693 EXFAT_B_TO_CLU(info->size, sbi), info->flags); 694 count = exfat_count_dir_entries(sb, &cdir); 695 if (count < 0) 696 return -EIO; 697 698 info->num_subdirs = count + EXFAT_MIN_SUBDIR; 699 } 700 return 0; 701} 702 703static int exfat_d_anon_disconn(struct dentry *dentry) 704{ 705 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); 706} 707 708static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, 709 unsigned int flags) 710{ 711 struct super_block *sb = dir->i_sb; 712 struct inode *inode; 713 struct dentry *alias; 714 struct exfat_dir_entry info; 715 int err; 716 loff_t i_pos; 717 mode_t i_mode; 718 719 mutex_lock(&EXFAT_SB(sb)->s_lock); 720 err = exfat_find(dir, &dentry->d_name, &info); 721 if (err) { 722 if (err == -ENOENT) { 723 inode = NULL; 724 goto out; 725 } 726 goto unlock; 727 } 728 729 i_pos = exfat_make_i_pos(&info); 730 inode = exfat_build_inode(sb, &info, i_pos); 731 err = PTR_ERR_OR_ZERO(inode); 732 if (err) 733 goto unlock; 734 735 i_mode = inode->i_mode; 736 alias = d_find_alias(inode); 737 738 /* 739 * Checking "alias->d_parent == dentry->d_parent" to make sure 740 * FS is not corrupted (especially double linked dir). 741 */ 742 if (alias && alias->d_parent == dentry->d_parent && 743 !exfat_d_anon_disconn(alias)) { 744 745 /* 746 * Unhashed alias is able to exist because of revalidate() 747 * called by lookup_fast. You can easily make this status 748 * by calling create and lookup concurrently 749 * In such case, we reuse an alias instead of new dentry 750 */ 751 if (d_unhashed(alias)) { 752 WARN_ON(alias->d_name.hash_len != 753 dentry->d_name.hash_len); 754 exfat_info(sb, "rehashed a dentry(%p) in read lookup", 755 alias); 756 d_drop(dentry); 757 d_rehash(alias); 758 } else if (!S_ISDIR(i_mode)) { 759 /* 760 * This inode has non anonymous-DCACHE_DISCONNECTED 761 * dentry. This means, the user did ->lookup() by an 762 * another name (longname vs 8.3 alias of it) in past. 763 * 764 * Switch to new one for reason of locality if possible. 765 */ 766 d_move(alias, dentry); 767 } 768 iput(inode); 769 mutex_unlock(&EXFAT_SB(sb)->s_lock); 770 return alias; 771 } 772 dput(alias); 773out: 774 mutex_unlock(&EXFAT_SB(sb)->s_lock); 775 if (!inode) 776 exfat_d_version_set(dentry, inode_query_iversion(dir)); 777 778 return d_splice_alias(inode, dentry); 779unlock: 780 mutex_unlock(&EXFAT_SB(sb)->s_lock); 781 return ERR_PTR(err); 782} 783 784/* remove an entry, BUT don't truncate */ 785static int exfat_unlink(struct inode *dir, struct dentry *dentry) 786{ 787 struct exfat_chain cdir; 788 struct exfat_dentry *ep; 789 struct super_block *sb = dir->i_sb; 790 struct inode *inode = dentry->d_inode; 791 struct exfat_inode_info *ei = EXFAT_I(inode); 792 struct buffer_head *bh; 793 sector_t sector; 794 int num_entries, entry, err = 0; 795 796 mutex_lock(&EXFAT_SB(sb)->s_lock); 797 exfat_chain_dup(&cdir, &ei->dir); 798 entry = ei->entry; 799 if (ei->dir.dir == DIR_DELETED) { 800 exfat_err(sb, "abnormal access to deleted dentry"); 801 err = -ENOENT; 802 goto unlock; 803 } 804 805 ep = exfat_get_dentry(sb, &cdir, entry, &bh, §or); 806 if (!ep) { 807 err = -EIO; 808 goto unlock; 809 } 810 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 811 if (num_entries < 0) { 812 err = -EIO; 813 brelse(bh); 814 goto unlock; 815 } 816 num_entries++; 817 brelse(bh); 818 819 exfat_set_volume_dirty(sb); 820 /* update the directory entry */ 821 if (exfat_remove_entries(dir, &cdir, entry, 0, num_entries)) { 822 err = -EIO; 823 goto unlock; 824 } 825 826 /* This doesn't modify ei */ 827 ei->dir.dir = DIR_DELETED; 828 exfat_clear_volume_dirty(sb); 829 830 inode_inc_iversion(dir); 831 dir->i_mtime = dir->i_atime = current_time(dir); 832 exfat_truncate_atime(&dir->i_atime); 833 if (IS_DIRSYNC(dir)) 834 exfat_sync_inode(dir); 835 else 836 mark_inode_dirty(dir); 837 838 clear_nlink(inode); 839 inode->i_mtime = inode->i_atime = current_time(inode); 840 exfat_truncate_atime(&inode->i_atime); 841 exfat_unhash_inode(inode); 842 exfat_d_version_set(dentry, inode_query_iversion(dir)); 843unlock: 844 mutex_unlock(&EXFAT_SB(sb)->s_lock); 845 return err; 846} 847 848static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 849{ 850 struct super_block *sb = dir->i_sb; 851 struct inode *inode; 852 struct exfat_dir_entry info; 853 struct exfat_chain cdir; 854 loff_t i_pos; 855 int err; 856 857 mutex_lock(&EXFAT_SB(sb)->s_lock); 858 exfat_set_volume_dirty(sb); 859 err = exfat_add_entry(dir, dentry->d_name.name, &cdir, TYPE_DIR, 860 &info); 861 exfat_clear_volume_dirty(sb); 862 if (err) 863 goto unlock; 864 865 inode_inc_iversion(dir); 866 dir->i_ctime = dir->i_mtime = current_time(dir); 867 if (IS_DIRSYNC(dir)) 868 exfat_sync_inode(dir); 869 else 870 mark_inode_dirty(dir); 871 inc_nlink(dir); 872 873 i_pos = exfat_make_i_pos(&info); 874 inode = exfat_build_inode(sb, &info, i_pos); 875 err = PTR_ERR_OR_ZERO(inode); 876 if (err) 877 goto unlock; 878 879 inode_inc_iversion(inode); 880 inode->i_mtime = inode->i_atime = inode->i_ctime = 881 EXFAT_I(inode)->i_crtime = current_time(inode); 882 exfat_truncate_atime(&inode->i_atime); 883 /* timestamp is already written, so mark_inode_dirty() is unneeded. */ 884 885 d_instantiate(dentry, inode); 886 887unlock: 888 mutex_unlock(&EXFAT_SB(sb)->s_lock); 889 return err; 890} 891 892static int exfat_check_dir_empty(struct super_block *sb, 893 struct exfat_chain *p_dir) 894{ 895 int i, dentries_per_clu; 896 unsigned int type; 897 struct exfat_chain clu; 898 struct exfat_dentry *ep; 899 struct exfat_sb_info *sbi = EXFAT_SB(sb); 900 struct buffer_head *bh; 901 902 dentries_per_clu = sbi->dentries_per_clu; 903 904 if (p_dir->dir == EXFAT_EOF_CLUSTER) 905 return 0; 906 907 exfat_chain_dup(&clu, p_dir); 908 909 while (clu.dir != EXFAT_EOF_CLUSTER) { 910 for (i = 0; i < dentries_per_clu; i++) { 911 ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); 912 if (!ep) 913 return -EIO; 914 type = exfat_get_entry_type(ep); 915 brelse(bh); 916 if (type == TYPE_UNUSED) 917 return 0; 918 919 if (type != TYPE_FILE && type != TYPE_DIR) 920 continue; 921 922 return -ENOTEMPTY; 923 } 924 925 if (clu.flags == ALLOC_NO_FAT_CHAIN) { 926 if (--clu.size > 0) 927 clu.dir++; 928 else 929 clu.dir = EXFAT_EOF_CLUSTER; 930 } else { 931 if (exfat_get_next_cluster(sb, &(clu.dir))) 932 return -EIO; 933 } 934 } 935 936 return 0; 937} 938 939static int exfat_rmdir(struct inode *dir, struct dentry *dentry) 940{ 941 struct inode *inode = dentry->d_inode; 942 struct exfat_dentry *ep; 943 struct exfat_chain cdir, clu_to_free; 944 struct super_block *sb = inode->i_sb; 945 struct exfat_sb_info *sbi = EXFAT_SB(sb); 946 struct exfat_inode_info *ei = EXFAT_I(inode); 947 struct buffer_head *bh; 948 sector_t sector; 949 int num_entries, entry, err; 950 951 mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); 952 953 exfat_chain_dup(&cdir, &ei->dir); 954 entry = ei->entry; 955 956 if (ei->dir.dir == DIR_DELETED) { 957 exfat_err(sb, "abnormal access to deleted dentry"); 958 err = -ENOENT; 959 goto unlock; 960 } 961 962 exfat_chain_set(&clu_to_free, ei->start_clu, 963 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi), ei->flags); 964 965 err = exfat_check_dir_empty(sb, &clu_to_free); 966 if (err) { 967 if (err == -EIO) 968 exfat_err(sb, "failed to exfat_check_dir_empty : err(%d)", 969 err); 970 goto unlock; 971 } 972 973 ep = exfat_get_dentry(sb, &cdir, entry, &bh, §or); 974 if (!ep) { 975 err = -EIO; 976 goto unlock; 977 } 978 979 num_entries = exfat_count_ext_entries(sb, &cdir, entry, ep); 980 if (num_entries < 0) { 981 err = -EIO; 982 brelse(bh); 983 goto unlock; 984 } 985 num_entries++; 986 brelse(bh); 987 988 exfat_set_volume_dirty(sb); 989 err = exfat_remove_entries(dir, &cdir, entry, 0, num_entries); 990 if (err) { 991 exfat_err(sb, "failed to exfat_remove_entries : err(%d)", err); 992 goto unlock; 993 } 994 ei->dir.dir = DIR_DELETED; 995 exfat_clear_volume_dirty(sb); 996 997 inode_inc_iversion(dir); 998 dir->i_mtime = dir->i_atime = current_time(dir); 999 exfat_truncate_atime(&dir->i_atime); 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 inode->i_mtime = inode->i_atime = current_time(inode); 1008 exfat_truncate_atime(&inode->i_atime); 1009 exfat_unhash_inode(inode); 1010 exfat_d_version_set(dentry, inode_query_iversion(dir)); 1011unlock: 1012 mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); 1013 return err; 1014} 1015 1016static 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 sector_t sector_old, sector_new; 1022 struct exfat_dentry *epold, *epnew; 1023 struct super_block *sb = inode->i_sb; 1024 struct buffer_head *new_bh, *old_bh; 1025 int sync = IS_DIRSYNC(inode); 1026 1027 epold = exfat_get_dentry(sb, p_dir, oldentry, &old_bh, §or_old); 1028 if (!epold) 1029 return -EIO; 1030 1031 num_old_entries = exfat_count_ext_entries(sb, p_dir, oldentry, epold); 1032 if (num_old_entries < 0) 1033 return -EIO; 1034 num_old_entries++; 1035 1036 num_new_entries = exfat_calc_num_entries(p_uniname); 1037 if (num_new_entries < 0) 1038 return num_new_entries; 1039 1040 if (num_old_entries < num_new_entries) { 1041 int newentry; 1042 1043 newentry = 1044 exfat_find_empty_entry(inode, p_dir, num_new_entries); 1045 if (newentry < 0) 1046 return newentry; /* -EIO or -ENOSPC */ 1047 1048 epnew = exfat_get_dentry(sb, p_dir, newentry, &new_bh, 1049 §or_new); 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 §or_old); 1064 if (!epold) 1065 return -EIO; 1066 epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh, 1067 §or_new); 1068 if (!epnew) { 1069 brelse(old_bh); 1070 return -EIO; 1071 } 1072 1073 *epnew = *epold; 1074 exfat_update_bh(new_bh, sync); 1075 brelse(old_bh); 1076 brelse(new_bh); 1077 1078 ret = exfat_init_ext_entry(inode, p_dir, newentry, 1079 num_new_entries, p_uniname); 1080 if (ret) 1081 return ret; 1082 1083 exfat_remove_entries(inode, p_dir, oldentry, 0, 1084 num_old_entries); 1085 ei->entry = newentry; 1086 } else { 1087 if (exfat_get_entry_type(epold) == TYPE_FILE) { 1088 epold->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1089 ei->attr |= ATTR_ARCHIVE; 1090 } 1091 exfat_update_bh(old_bh, sync); 1092 brelse(old_bh); 1093 ret = exfat_init_ext_entry(inode, p_dir, oldentry, 1094 num_new_entries, p_uniname); 1095 if (ret) 1096 return ret; 1097 1098 exfat_remove_entries(inode, p_dir, oldentry, num_new_entries, 1099 num_old_entries); 1100 } 1101 return 0; 1102} 1103 1104static int exfat_move_file(struct inode *inode, struct exfat_chain *p_olddir, 1105 int oldentry, struct exfat_chain *p_newdir, 1106 struct exfat_uni_name *p_uniname, struct exfat_inode_info *ei) 1107{ 1108 int ret, newentry, num_new_entries, num_old_entries; 1109 sector_t sector_mov, sector_new; 1110 struct exfat_dentry *epmov, *epnew; 1111 struct super_block *sb = inode->i_sb; 1112 struct buffer_head *mov_bh, *new_bh; 1113 1114 epmov = exfat_get_dentry(sb, p_olddir, oldentry, &mov_bh, §or_mov); 1115 if (!epmov) 1116 return -EIO; 1117 1118 num_old_entries = exfat_count_ext_entries(sb, p_olddir, oldentry, 1119 epmov); 1120 if (num_old_entries < 0) 1121 return -EIO; 1122 num_old_entries++; 1123 1124 num_new_entries = exfat_calc_num_entries(p_uniname); 1125 if (num_new_entries < 0) 1126 return num_new_entries; 1127 1128 newentry = exfat_find_empty_entry(inode, p_newdir, num_new_entries); 1129 if (newentry < 0) 1130 return newentry; /* -EIO or -ENOSPC */ 1131 1132 epnew = exfat_get_dentry(sb, p_newdir, newentry, &new_bh, §or_new); 1133 if (!epnew) 1134 return -EIO; 1135 1136 *epnew = *epmov; 1137 if (exfat_get_entry_type(epnew) == TYPE_FILE) { 1138 epnew->dentry.file.attr |= cpu_to_le16(ATTR_ARCHIVE); 1139 ei->attr |= ATTR_ARCHIVE; 1140 } 1141 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1142 brelse(mov_bh); 1143 brelse(new_bh); 1144 1145 epmov = exfat_get_dentry(sb, p_olddir, oldentry + 1, &mov_bh, 1146 §or_mov); 1147 if (!epmov) 1148 return -EIO; 1149 epnew = exfat_get_dentry(sb, p_newdir, newentry + 1, &new_bh, 1150 §or_new); 1151 if (!epnew) { 1152 brelse(mov_bh); 1153 return -EIO; 1154 } 1155 1156 *epnew = *epmov; 1157 exfat_update_bh(new_bh, IS_DIRSYNC(inode)); 1158 brelse(mov_bh); 1159 brelse(new_bh); 1160 1161 ret = exfat_init_ext_entry(inode, p_newdir, newentry, num_new_entries, 1162 p_uniname); 1163 if (ret) 1164 return ret; 1165 1166 exfat_remove_entries(inode, p_olddir, oldentry, 0, num_old_entries); 1167 1168 exfat_chain_set(&ei->dir, p_newdir->dir, p_newdir->size, 1169 p_newdir->flags); 1170 1171 ei->entry = newentry; 1172 return 0; 1173} 1174 1175static void exfat_update_parent_info(struct exfat_inode_info *ei, 1176 struct inode *parent_inode) 1177{ 1178 struct exfat_sb_info *sbi = EXFAT_SB(parent_inode->i_sb); 1179 struct exfat_inode_info *parent_ei = EXFAT_I(parent_inode); 1180 loff_t parent_isize = i_size_read(parent_inode); 1181 1182 /* 1183 * the problem that struct exfat_inode_info caches wrong parent info. 1184 * 1185 * because of flag-mismatch of ei->dir, 1186 * there is abnormal traversing cluster chain. 1187 */ 1188 if (unlikely(parent_ei->flags != ei->dir.flags || 1189 parent_isize != EXFAT_CLU_TO_B(ei->dir.size, sbi) || 1190 parent_ei->start_clu != ei->dir.dir)) { 1191 exfat_chain_set(&ei->dir, parent_ei->start_clu, 1192 EXFAT_B_TO_CLU_ROUND_UP(parent_isize, sbi), 1193 parent_ei->flags); 1194 } 1195} 1196 1197/* rename or move a old file into a new file */ 1198static int __exfat_rename(struct inode *old_parent_inode, 1199 struct exfat_inode_info *ei, struct inode *new_parent_inode, 1200 struct dentry *new_dentry) 1201{ 1202 int ret; 1203 int dentry; 1204 struct exfat_chain olddir, newdir; 1205 struct exfat_chain *p_dir = NULL; 1206 struct exfat_uni_name uni_name; 1207 struct exfat_dentry *ep; 1208 struct super_block *sb = old_parent_inode->i_sb; 1209 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1210 const unsigned char *new_path = new_dentry->d_name.name; 1211 struct inode *new_inode = new_dentry->d_inode; 1212 int num_entries; 1213 struct exfat_inode_info *new_ei = NULL; 1214 unsigned int new_entry_type = TYPE_UNUSED; 1215 int new_entry = 0; 1216 struct buffer_head *old_bh, *new_bh = NULL; 1217 1218 /* check the validity of pointer parameters */ 1219 if (new_path == NULL || strlen(new_path) == 0) 1220 return -EINVAL; 1221 1222 if (ei->dir.dir == DIR_DELETED) { 1223 exfat_err(sb, "abnormal access to deleted source dentry"); 1224 return -ENOENT; 1225 } 1226 1227 exfat_update_parent_info(ei, old_parent_inode); 1228 1229 exfat_chain_dup(&olddir, &ei->dir); 1230 dentry = ei->entry; 1231 1232 ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL); 1233 if (!ep) { 1234 ret = -EIO; 1235 goto out; 1236 } 1237 brelse(old_bh); 1238 1239 /* check whether new dir is existing directory and empty */ 1240 if (new_inode) { 1241 ret = -EIO; 1242 new_ei = EXFAT_I(new_inode); 1243 1244 if (new_ei->dir.dir == DIR_DELETED) { 1245 exfat_err(sb, "abnormal access to deleted target dentry"); 1246 goto out; 1247 } 1248 1249 exfat_update_parent_info(new_ei, new_parent_inode); 1250 1251 p_dir = &(new_ei->dir); 1252 new_entry = new_ei->entry; 1253 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL); 1254 if (!ep) 1255 goto out; 1256 1257 new_entry_type = exfat_get_entry_type(ep); 1258 brelse(new_bh); 1259 1260 /* if new_inode exists, update ei */ 1261 if (new_entry_type == TYPE_DIR) { 1262 struct exfat_chain new_clu; 1263 1264 new_clu.dir = new_ei->start_clu; 1265 new_clu.size = 1266 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1267 sbi); 1268 new_clu.flags = new_ei->flags; 1269 1270 ret = exfat_check_dir_empty(sb, &new_clu); 1271 if (ret) 1272 goto out; 1273 } 1274 } 1275 1276 /* check the validity of directory name in the given new pathname */ 1277 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir, 1278 &uni_name); 1279 if (ret) 1280 goto out; 1281 1282 exfat_set_volume_dirty(sb); 1283 1284 if (olddir.dir == newdir.dir) 1285 ret = exfat_rename_file(new_parent_inode, &olddir, dentry, 1286 &uni_name, ei); 1287 else 1288 ret = exfat_move_file(new_parent_inode, &olddir, dentry, 1289 &newdir, &uni_name, ei); 1290 1291 if (!ret && new_inode) { 1292 /* delete entries of new_dir */ 1293 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL); 1294 if (!ep) { 1295 ret = -EIO; 1296 goto del_out; 1297 } 1298 1299 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep); 1300 if (num_entries < 0) { 1301 ret = -EIO; 1302 goto del_out; 1303 } 1304 brelse(new_bh); 1305 1306 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0, 1307 num_entries + 1)) { 1308 ret = -EIO; 1309 goto del_out; 1310 } 1311 1312 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ 1313 if (new_entry_type == TYPE_DIR && 1314 new_ei->start_clu != EXFAT_EOF_CLUSTER) { 1315 /* new_ei, new_clu_to_free */ 1316 struct exfat_chain new_clu_to_free; 1317 1318 exfat_chain_set(&new_clu_to_free, new_ei->start_clu, 1319 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode), 1320 sbi), new_ei->flags); 1321 1322 if (exfat_free_cluster(new_inode, &new_clu_to_free)) { 1323 /* just set I/O error only */ 1324 ret = -EIO; 1325 } 1326 1327 i_size_write(new_inode, 0); 1328 new_ei->start_clu = EXFAT_EOF_CLUSTER; 1329 new_ei->flags = ALLOC_NO_FAT_CHAIN; 1330 } 1331del_out: 1332 /* Update new_inode ei 1333 * Prevent syncing removed new_inode 1334 * (new_ei is already initialized above code ("if (new_inode)") 1335 */ 1336 new_ei->dir.dir = DIR_DELETED; 1337 } 1338 exfat_clear_volume_dirty(sb); 1339out: 1340 return ret; 1341} 1342 1343static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry, 1344 struct inode *new_dir, struct dentry *new_dentry, 1345 unsigned int flags) 1346{ 1347 struct inode *old_inode, *new_inode; 1348 struct super_block *sb = old_dir->i_sb; 1349 loff_t i_pos; 1350 int err; 1351 1352 /* 1353 * The VFS already checks for existence, so for local filesystems 1354 * the RENAME_NOREPLACE implementation is equivalent to plain rename. 1355 * Don't support any other flags 1356 */ 1357 if (flags & ~RENAME_NOREPLACE) 1358 return -EINVAL; 1359 1360 mutex_lock(&EXFAT_SB(sb)->s_lock); 1361 old_inode = old_dentry->d_inode; 1362 new_inode = new_dentry->d_inode; 1363 1364 err = __exfat_rename(old_dir, EXFAT_I(old_inode), new_dir, new_dentry); 1365 if (err) 1366 goto unlock; 1367 1368 inode_inc_iversion(new_dir); 1369 new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = 1370 EXFAT_I(new_dir)->i_crtime = current_time(new_dir); 1371 exfat_truncate_atime(&new_dir->i_atime); 1372 if (IS_DIRSYNC(new_dir)) 1373 exfat_sync_inode(new_dir); 1374 else 1375 mark_inode_dirty(new_dir); 1376 1377 i_pos = ((loff_t)EXFAT_I(old_inode)->dir.dir << 32) | 1378 (EXFAT_I(old_inode)->entry & 0xffffffff); 1379 exfat_unhash_inode(old_inode); 1380 exfat_hash_inode(old_inode, i_pos); 1381 if (IS_DIRSYNC(new_dir)) 1382 exfat_sync_inode(old_inode); 1383 else 1384 mark_inode_dirty(old_inode); 1385 1386 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { 1387 drop_nlink(old_dir); 1388 if (!new_inode) 1389 inc_nlink(new_dir); 1390 } 1391 1392 inode_inc_iversion(old_dir); 1393 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1394 if (IS_DIRSYNC(old_dir)) 1395 exfat_sync_inode(old_dir); 1396 else 1397 mark_inode_dirty(old_dir); 1398 1399 if (new_inode) { 1400 exfat_unhash_inode(new_inode); 1401 1402 /* skip drop_nlink if new_inode already has been dropped */ 1403 if (new_inode->i_nlink) { 1404 drop_nlink(new_inode); 1405 if (S_ISDIR(new_inode->i_mode)) 1406 drop_nlink(new_inode); 1407 } else { 1408 exfat_warn(sb, "abnormal access to an inode dropped"); 1409 WARN_ON(new_inode->i_nlink == 0); 1410 } 1411 new_inode->i_ctime = EXFAT_I(new_inode)->i_crtime = 1412 current_time(new_inode); 1413 } 1414 1415unlock: 1416 mutex_unlock(&EXFAT_SB(sb)->s_lock); 1417 return err; 1418} 1419 1420const struct inode_operations exfat_dir_inode_operations = { 1421 .create = exfat_create, 1422 .lookup = exfat_lookup, 1423 .unlink = exfat_unlink, 1424 .mkdir = exfat_mkdir, 1425 .rmdir = exfat_rmdir, 1426 .rename = exfat_rename, 1427 .setattr = exfat_setattr, 1428 .getattr = exfat_getattr, 1429}; 1430