1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. 4 */ 5 6 #include <linux/slab.h> 7 #include <linux/compat.h> 8 #include <linux/bio.h> 9 #include <linux/buffer_head.h> 10 #include <linux/filelock.h> 11 12 #include "exfat_raw.h" 13 #include "exfat_fs.h" 14 15 static int exfat_extract_uni_name(struct exfat_dentry *ep, 16 unsigned short *uniname) 17 { 18 int i, len = 0; 19 20 for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { 21 *uniname = le16_to_cpu(ep->dentry.name.unicode_0_14[i]); 22 if (*uniname == 0x0) 23 return len; 24 uniname++; 25 len++; 26 } 27 28 *uniname = 0x0; 29 return len; 30 31 } 32 33 static int exfat_get_uniname_from_ext_entry(struct super_block *sb, 34 struct exfat_chain *p_dir, int entry, unsigned short *uniname) 35 { 36 int i, err; 37 struct exfat_entry_set_cache es; 38 unsigned int uni_len = 0, len; 39 40 err = exfat_get_dentry_set(&es, sb, p_dir, entry, ES_ALL_ENTRIES); 41 if (err) 42 return err; 43 44 /* 45 * First entry : file entry 46 * Second entry : stream-extension entry 47 * Third entry : first file-name entry 48 * So, the index of first file-name dentry should start from 2. 49 */ 50 for (i = ES_IDX_FIRST_FILENAME; i < es.num_entries; i++) { 51 struct exfat_dentry *ep = exfat_get_dentry_cached(&es, i); 52 53 /* end of name entry */ 54 if (exfat_get_entry_type(ep) != TYPE_EXTEND) 55 break; 56 57 len = exfat_extract_uni_name(ep, uniname); 58 uni_len += len; 59 if (len != EXFAT_FILE_NAME_LEN || uni_len >= MAX_NAME_LENGTH) 60 break; 61 uniname += EXFAT_FILE_NAME_LEN; 62 } 63 64 exfat_put_dentry_set(&es, false); 65 return 0; 66 } 67 68 /* read a directory entry from the opened directory */ 69 static int exfat_readdir(struct inode *inode, loff_t *cpos, struct exfat_dir_entry *dir_entry) 70 { 71 int i, dentries_per_clu, num_ext, err; 72 unsigned int type, clu_offset, max_dentries; 73 struct exfat_chain dir, clu; 74 struct exfat_uni_name uni_name; 75 struct exfat_dentry *ep; 76 struct super_block *sb = inode->i_sb; 77 struct exfat_sb_info *sbi = EXFAT_SB(sb); 78 struct exfat_inode_info *ei = EXFAT_I(inode); 79 unsigned int dentry = exfat_bytes_to_dentries(*cpos) & 0xFFFFFFFF; 80 struct buffer_head *bh; 81 82 /* check if the given file ID is opened */ 83 if (ei->type != TYPE_DIR) 84 return -EPERM; 85 86 exfat_chain_set(&dir, ei->start_clu, 87 exfat_bytes_to_cluster(sbi, i_size_read(inode)), ei->flags); 88 89 dentries_per_clu = sbi->dentries_per_clu; 90 max_dentries = min(MAX_EXFAT_DENTRIES, 91 exfat_cluster_to_dentries(sbi, sbi->num_clusters)); 92 93 clu_offset = exfat_dentries_to_cluster(sbi, dentry); 94 exfat_chain_dup(&clu, &dir); 95 96 if (clu.flags == ALLOC_FAT_CHAIN) { 97 /* hint_information */ 98 if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && 99 ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { 100 clu_offset -= ei->hint_bmap.off; 101 clu.dir = ei->hint_bmap.clu; 102 clu.size -= ei->hint_bmap.off; 103 } 104 } 105 106 if (exfat_chain_advance(sb, &clu, clu_offset)) 107 return -EIO; 108 109 while (clu.dir != EXFAT_EOF_CLUSTER && dentry < max_dentries) { 110 i = dentry & (dentries_per_clu - 1); 111 112 for ( ; i < dentries_per_clu; i++, dentry++) { 113 ep = exfat_get_dentry(sb, &clu, i, &bh); 114 if (!ep) 115 return -EIO; 116 117 type = exfat_get_entry_type(ep); 118 if (type == TYPE_UNUSED) { 119 brelse(bh); 120 goto out; 121 } 122 123 if (type != TYPE_FILE && type != TYPE_DIR) { 124 brelse(bh); 125 continue; 126 } 127 128 num_ext = ep->dentry.file.num_ext; 129 dir_entry->attr = le16_to_cpu(ep->dentry.file.attr); 130 131 *uni_name.name = 0x0; 132 err = exfat_get_uniname_from_ext_entry(sb, &clu, i, 133 uni_name.name); 134 if (err) { 135 brelse(bh); 136 continue; 137 } 138 exfat_utf16_to_nls(sb, &uni_name, 139 dir_entry->namebuf.lfn, 140 dir_entry->namebuf.lfnbuf_len); 141 brelse(bh); 142 143 ep = exfat_get_dentry(sb, &clu, i + 1, &bh); 144 if (!ep) 145 return -EIO; 146 dir_entry->entry = i; 147 dir_entry->dir = clu; 148 brelse(bh); 149 150 ei->hint_bmap.off = exfat_dentries_to_cluster(sbi, dentry); 151 ei->hint_bmap.clu = clu.dir; 152 153 *cpos = exfat_dentries_to_bytes(dentry + 1 + num_ext); 154 return 0; 155 } 156 157 if (exfat_chain_advance(sb, &clu, 1)) 158 return -EIO; 159 } 160 161 out: 162 dir_entry->namebuf.lfn[0] = '\0'; 163 *cpos = exfat_dentries_to_bytes(dentry); 164 return 0; 165 } 166 167 static void exfat_init_namebuf(struct exfat_dentry_namebuf *nb) 168 { 169 nb->lfn = NULL; 170 nb->lfnbuf_len = 0; 171 } 172 173 static int exfat_alloc_namebuf(struct exfat_dentry_namebuf *nb) 174 { 175 nb->lfn = __getname(); 176 if (!nb->lfn) 177 return -ENOMEM; 178 nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE; 179 return 0; 180 } 181 182 static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb) 183 { 184 if (!nb->lfn) 185 return; 186 187 __putname(nb->lfn); 188 exfat_init_namebuf(nb); 189 } 190 191 /* 192 * Before calling dir_emit*(), sbi->s_lock should be released 193 * because page fault can occur in dir_emit*(). 194 */ 195 #define ITER_POS_FILLED_DOTS (2) 196 static int exfat_iterate(struct file *file, struct dir_context *ctx) 197 { 198 struct inode *inode = file_inode(file); 199 struct super_block *sb = inode->i_sb; 200 struct inode *tmp; 201 struct exfat_dir_entry de; 202 struct exfat_dentry_namebuf *nb = &(de.namebuf); 203 struct exfat_inode_info *ei = EXFAT_I(inode); 204 unsigned long inum; 205 loff_t cpos, i_pos; 206 int err = 0, fake_offset = 0; 207 208 exfat_init_namebuf(nb); 209 210 cpos = ctx->pos; 211 if (!dir_emit_dots(file, ctx)) 212 goto out; 213 214 if (ctx->pos == ITER_POS_FILLED_DOTS) { 215 cpos = 0; 216 fake_offset = 1; 217 } 218 219 cpos = round_up(cpos, DENTRY_SIZE); 220 221 /* name buffer should be allocated before use */ 222 err = exfat_alloc_namebuf(nb); 223 if (err) 224 goto out; 225 get_new: 226 mutex_lock(&EXFAT_SB(sb)->s_lock); 227 228 if (ei->flags == ALLOC_NO_FAT_CHAIN && cpos >= i_size_read(inode)) 229 goto end_of_dir; 230 231 err = exfat_readdir(inode, &cpos, &de); 232 if (err) { 233 /* 234 * At least we tried to read a sector. 235 * Move cpos to next sector position (should be aligned). 236 */ 237 if (err == -EIO) { 238 cpos += 1 << (sb->s_blocksize_bits); 239 cpos &= ~(loff_t)(sb->s_blocksize - 1); 240 } 241 242 err = -EIO; 243 goto end_of_dir; 244 } 245 246 if (!nb->lfn[0]) 247 goto end_of_dir; 248 249 i_pos = ((loff_t)de.dir.dir << 32) | (de.entry & 0xffffffff); 250 tmp = exfat_iget(sb, i_pos); 251 if (tmp) { 252 inum = tmp->i_ino; 253 iput(tmp); 254 } else { 255 inum = iunique(sb, EXFAT_ROOT_INO); 256 } 257 258 mutex_unlock(&EXFAT_SB(sb)->s_lock); 259 if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum, 260 (de.attr & EXFAT_ATTR_SUBDIR) ? DT_DIR : DT_REG)) 261 goto out; 262 ctx->pos = cpos; 263 goto get_new; 264 265 end_of_dir: 266 if (!cpos && fake_offset) 267 cpos = ITER_POS_FILLED_DOTS; 268 ctx->pos = cpos; 269 mutex_unlock(&EXFAT_SB(sb)->s_lock); 270 out: 271 /* 272 * To improve performance, free namebuf after unlock sb_lock. 273 * If namebuf is not allocated, this function do nothing 274 */ 275 exfat_free_namebuf(nb); 276 return err; 277 } 278 279 WRAP_DIR_ITER(exfat_iterate) // FIXME! 280 const struct file_operations exfat_dir_operations = { 281 .llseek = generic_file_llseek, 282 .read = generic_read_dir, 283 .iterate_shared = shared_exfat_iterate, 284 .unlocked_ioctl = exfat_ioctl, 285 #ifdef CONFIG_COMPAT 286 .compat_ioctl = exfat_compat_ioctl, 287 #endif 288 .fsync = exfat_file_fsync, 289 .setlease = generic_setlease, 290 }; 291 292 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu) 293 { 294 int ret; 295 296 exfat_chain_set(clu, EXFAT_EOF_CLUSTER, 0, ALLOC_NO_FAT_CHAIN); 297 298 ret = exfat_alloc_cluster(inode, 1, clu, IS_DIRSYNC(inode), false); 299 if (ret) 300 return ret; 301 302 return exfat_zeroed_cluster(inode, clu->dir); 303 } 304 305 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname) 306 { 307 int len; 308 309 len = p_uniname->name_len; 310 if (len == 0) 311 return -EINVAL; 312 313 /* 1 file entry + 1 stream entry + name entries */ 314 return ES_ENTRY_NUM(len); 315 } 316 317 unsigned int exfat_get_entry_type(struct exfat_dentry *ep) 318 { 319 if (ep->type == EXFAT_UNUSED) 320 return TYPE_UNUSED; 321 if (IS_EXFAT_DELETED(ep->type)) 322 return TYPE_DELETED; 323 if (ep->type == EXFAT_INVAL) 324 return TYPE_INVALID; 325 if (IS_EXFAT_CRITICAL_PRI(ep->type)) { 326 if (ep->type == EXFAT_BITMAP) 327 return TYPE_BITMAP; 328 if (ep->type == EXFAT_UPCASE) 329 return TYPE_UPCASE; 330 if (ep->type == EXFAT_VOLUME) 331 return TYPE_VOLUME; 332 if (ep->type == EXFAT_FILE) { 333 if (le16_to_cpu(ep->dentry.file.attr) & EXFAT_ATTR_SUBDIR) 334 return TYPE_DIR; 335 return TYPE_FILE; 336 } 337 return TYPE_CRITICAL_PRI; 338 } 339 if (IS_EXFAT_BENIGN_PRI(ep->type)) { 340 if (ep->type == EXFAT_GUID) 341 return TYPE_GUID; 342 if (ep->type == EXFAT_PADDING) 343 return TYPE_PADDING; 344 if (ep->type == EXFAT_ACLTAB) 345 return TYPE_ACLTAB; 346 return TYPE_BENIGN_PRI; 347 } 348 if (IS_EXFAT_CRITICAL_SEC(ep->type)) { 349 if (ep->type == EXFAT_STREAM) 350 return TYPE_STREAM; 351 if (ep->type == EXFAT_NAME) 352 return TYPE_EXTEND; 353 if (ep->type == EXFAT_ACL) 354 return TYPE_ACL; 355 return TYPE_CRITICAL_SEC; 356 } 357 358 if (ep->type == EXFAT_VENDOR_EXT) 359 return TYPE_VENDOR_EXT; 360 if (ep->type == EXFAT_VENDOR_ALLOC) 361 return TYPE_VENDOR_ALLOC; 362 363 return TYPE_BENIGN_SEC; 364 } 365 366 static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type) 367 { 368 if (type == TYPE_UNUSED) { 369 ep->type = EXFAT_UNUSED; 370 } else if (type == TYPE_DELETED) { 371 ep->type &= EXFAT_DELETE; 372 } else if (type == TYPE_STREAM) { 373 ep->type = EXFAT_STREAM; 374 } else if (type == TYPE_EXTEND) { 375 ep->type = EXFAT_NAME; 376 } else if (type == TYPE_BITMAP) { 377 ep->type = EXFAT_BITMAP; 378 } else if (type == TYPE_UPCASE) { 379 ep->type = EXFAT_UPCASE; 380 } else if (type == TYPE_VOLUME) { 381 ep->type = EXFAT_VOLUME; 382 } else if (type == TYPE_DIR) { 383 ep->type = EXFAT_FILE; 384 ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_SUBDIR); 385 } else if (type == TYPE_FILE) { 386 ep->type = EXFAT_FILE; 387 ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_ARCHIVE); 388 } 389 } 390 391 static void exfat_init_stream_entry(struct exfat_dentry *ep, 392 unsigned int start_clu, unsigned long long size) 393 { 394 memset(ep, 0, sizeof(*ep)); 395 exfat_set_entry_type(ep, TYPE_STREAM); 396 if (size == 0) 397 ep->dentry.stream.flags = ALLOC_FAT_CHAIN; 398 else 399 ep->dentry.stream.flags = ALLOC_NO_FAT_CHAIN; 400 ep->dentry.stream.start_clu = cpu_to_le32(start_clu); 401 ep->dentry.stream.valid_size = cpu_to_le64(size); 402 ep->dentry.stream.size = cpu_to_le64(size); 403 } 404 405 static void exfat_init_name_entry(struct exfat_dentry *ep, 406 unsigned short *uniname) 407 { 408 int i; 409 410 exfat_set_entry_type(ep, TYPE_EXTEND); 411 ep->dentry.name.flags = 0x0; 412 413 for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { 414 if (*uniname != 0x0) { 415 ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname); 416 uniname++; 417 } else { 418 ep->dentry.name.unicode_0_14[i] = 0x0; 419 } 420 } 421 } 422 423 void exfat_init_dir_entry(struct exfat_entry_set_cache *es, 424 unsigned int type, unsigned int start_clu, 425 unsigned long long size, struct timespec64 *ts) 426 { 427 struct super_block *sb = es->sb; 428 struct exfat_sb_info *sbi = EXFAT_SB(sb); 429 struct exfat_dentry *ep; 430 431 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 432 memset(ep, 0, sizeof(*ep)); 433 exfat_set_entry_type(ep, type); 434 exfat_set_entry_time(sbi, ts, 435 &ep->dentry.file.create_tz, 436 &ep->dentry.file.create_time, 437 &ep->dentry.file.create_date, 438 &ep->dentry.file.create_time_cs); 439 exfat_set_entry_time(sbi, ts, 440 &ep->dentry.file.modify_tz, 441 &ep->dentry.file.modify_time, 442 &ep->dentry.file.modify_date, 443 &ep->dentry.file.modify_time_cs); 444 exfat_set_entry_time(sbi, ts, 445 &ep->dentry.file.access_tz, 446 &ep->dentry.file.access_time, 447 &ep->dentry.file.access_date, 448 NULL); 449 450 ep = exfat_get_dentry_cached(es, ES_IDX_STREAM); 451 exfat_init_stream_entry(ep, start_clu, size); 452 } 453 454 static void exfat_free_benign_secondary_clusters(struct inode *inode, 455 struct exfat_dentry *ep) 456 { 457 struct super_block *sb = inode->i_sb; 458 struct exfat_chain dir; 459 unsigned int start_clu = 460 le32_to_cpu(ep->dentry.generic_secondary.start_clu); 461 u64 size = le64_to_cpu(ep->dentry.generic_secondary.size); 462 unsigned char flags = ep->dentry.generic_secondary.flags; 463 464 if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size) 465 return; 466 467 exfat_chain_set(&dir, start_clu, 468 exfat_bytes_to_cluster_round_up(EXFAT_SB(sb), size), 469 flags); 470 exfat_free_cluster(inode, &dir); 471 } 472 473 /* 474 * exfat_init_ext_entry - initialize extension entries in a directory entry set 475 * @es: target entry set 476 * @num_entries: number of entries excluding benign secondary entries 477 * @p_uniname: filename to store 478 * @old_es: optional source entry set with benign secondary entries, or NULL 479 * @num_extra: number of benign secondary entries to copy from @old_es 480 * 481 * Set up the file, stream extension, and filename entries in @es, optionally 482 * preserving @num_extra benign secondary entries from @old_es. @es and @old_es 483 * may refer to the same entry set; excess entries are marked as deleted. 484 */ 485 void exfat_init_ext_entry(struct exfat_entry_set_cache *es, int num_entries, 486 struct exfat_uni_name *p_uniname, 487 struct exfat_entry_set_cache *old_es, int num_extra) 488 { 489 int i, src_start = 0, old_num; 490 unsigned short *uniname = p_uniname->name; 491 struct exfat_dentry *ep; 492 493 if (WARN_ON(num_extra < 0 || (num_extra && (!old_es || 494 old_es->num_entries < ES_IDX_FIRST_FILENAME + num_extra)))) 495 num_extra = 0; 496 497 /* 498 * Save old entry count and source position before modifying 499 * es->num_entries, since old_es and es may point to the same 500 * entry set. 501 */ 502 old_num = es->num_entries; 503 if (old_es && num_extra > 0) 504 src_start = old_es->num_entries - num_extra; 505 506 es->num_entries = num_entries + num_extra; 507 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 508 ep->dentry.file.num_ext = (unsigned char)(num_entries - 1 + num_extra); 509 510 ep = exfat_get_dentry_cached(es, ES_IDX_STREAM); 511 ep->dentry.stream.name_len = p_uniname->name_len; 512 ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); 513 514 if (old_es && num_extra > 0) { 515 for (i = 0; i < num_extra; i++) 516 *exfat_get_dentry_cached(es, num_entries + i) = 517 *exfat_get_dentry_cached(old_es, src_start + i); 518 } 519 520 for (i = ES_IDX_FIRST_FILENAME; i < num_entries; i++) { 521 ep = exfat_get_dentry_cached(es, i); 522 exfat_init_name_entry(ep, uniname); 523 uniname += EXFAT_FILE_NAME_LEN; 524 } 525 526 /* Mark excess old entries as deleted (in-place shrink) */ 527 for (i = num_entries + num_extra; i < old_num; i++) { 528 ep = exfat_get_dentry_cached(es, i); 529 exfat_set_entry_type(ep, TYPE_DELETED); 530 } 531 532 exfat_update_dir_chksum(es); 533 } 534 535 void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es, 536 int order, bool free_benign) 537 { 538 int i; 539 struct exfat_dentry *ep; 540 541 for (i = order; i < es->num_entries; i++) { 542 ep = exfat_get_dentry_cached(es, i); 543 544 if (free_benign && (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)) 545 exfat_free_benign_secondary_clusters(inode, ep); 546 547 exfat_set_entry_type(ep, TYPE_DELETED); 548 } 549 550 if (order < es->num_entries) 551 es->modified = true; 552 } 553 554 void exfat_update_dir_chksum(struct exfat_entry_set_cache *es) 555 { 556 int chksum_type = CS_DIR_ENTRY, i; 557 unsigned short chksum = 0; 558 struct exfat_dentry *ep; 559 560 for (i = ES_IDX_FILE; i < es->num_entries; i++) { 561 ep = exfat_get_dentry_cached(es, i); 562 chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, 563 chksum_type); 564 chksum_type = CS_DEFAULT; 565 } 566 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 567 ep->dentry.file.checksum = cpu_to_le16(chksum); 568 es->modified = true; 569 } 570 571 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync) 572 { 573 int i, err = 0; 574 575 if (es->modified) 576 err = exfat_update_bhs(es->bh, es->num_bh, sync); 577 578 for (i = 0; i < es->num_bh; i++) 579 if (err) 580 bforget(es->bh[i]); 581 else 582 brelse(es->bh[i]); 583 584 if (IS_DYNAMIC_ES(es)) 585 kfree(es->bh); 586 587 return err; 588 } 589 590 static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, 591 int entry, sector_t *sector, int *offset) 592 { 593 int ret; 594 unsigned int off, clu = 0; 595 struct exfat_sb_info *sbi = EXFAT_SB(sb); 596 597 off = exfat_dentries_to_bytes(entry); 598 599 clu = p_dir->dir; 600 ret = exfat_cluster_walk(sb, &clu, exfat_bytes_to_cluster(sbi, off), 601 p_dir->flags); 602 if (ret) 603 return ret; 604 605 if (clu == EXFAT_EOF_CLUSTER) { 606 exfat_fs_error(sb, 607 "unexpected early break in cluster chain (clu : %u, len : %d)", 608 p_dir->dir, 609 exfat_bytes_to_cluster(sbi, off)); 610 return -EIO; 611 } 612 613 if (!exfat_test_bitmap(sb, clu)) { 614 exfat_err(sb, "failed to test cluster bit(%u)", clu); 615 return -EIO; 616 } 617 618 /* byte offset in cluster */ 619 off = exfat_cluster_offset(sbi, off); 620 621 /* byte offset in sector */ 622 *offset = exfat_block_offset(sb, off); 623 624 /* sector offset in cluster */ 625 *sector = exfat_bytes_to_block(sb, off); 626 *sector += exfat_cluster_to_sector(sbi, clu); 627 return 0; 628 } 629 630 struct exfat_dentry *exfat_get_dentry(struct super_block *sb, 631 struct exfat_chain *p_dir, int entry, struct buffer_head **bh) 632 { 633 struct exfat_sb_info *sbi = EXFAT_SB(sb); 634 unsigned int sect_per_clus = sbi->sect_per_clus; 635 unsigned int dentries_per_page = exfat_bytes_to_dentries(PAGE_SIZE); 636 int off; 637 sector_t sec; 638 639 if (p_dir->dir == DIR_DELETED) { 640 exfat_err(sb, "abnormal access to deleted dentry"); 641 return NULL; 642 } 643 644 if (exfat_find_location(sb, p_dir, entry, &sec, &off)) 645 return NULL; 646 647 if (sect_per_clus > 1 && 648 (entry & (dentries_per_page - 1)) == 0) { 649 sector_t ra = sec; 650 blkcnt_t cnt = 0; 651 unsigned int ra_count = sect_per_clus; 652 653 /* Not sector aligned with ra_count, resize ra_count to page size */ 654 if ((sec - sbi->data_start_sector) & (ra_count - 1)) 655 ra_count = PAGE_SIZE >> sb->s_blocksize_bits; 656 657 exfat_blk_readahead(sb, sec, &ra, &cnt, sec + ra_count - 1); 658 } 659 660 *bh = sb_bread(sb, sec); 661 if (!*bh) 662 return NULL; 663 664 return (struct exfat_dentry *)((*bh)->b_data + off); 665 } 666 667 enum exfat_validate_dentry_mode { 668 ES_MODE_GET_FILE_ENTRY, 669 ES_MODE_GET_STRM_ENTRY, 670 ES_MODE_GET_NAME_ENTRY, 671 ES_MODE_GET_CRITICAL_SEC_ENTRY, 672 ES_MODE_GET_BENIGN_SEC_ENTRY, 673 }; 674 675 static bool exfat_validate_entry(unsigned int type, 676 enum exfat_validate_dentry_mode *mode) 677 { 678 if (type == TYPE_UNUSED || type == TYPE_DELETED) 679 return false; 680 681 switch (*mode) { 682 case ES_MODE_GET_FILE_ENTRY: 683 if (type != TYPE_STREAM) 684 return false; 685 *mode = ES_MODE_GET_STRM_ENTRY; 686 break; 687 case ES_MODE_GET_STRM_ENTRY: 688 if (type != TYPE_EXTEND) 689 return false; 690 *mode = ES_MODE_GET_NAME_ENTRY; 691 break; 692 case ES_MODE_GET_NAME_ENTRY: 693 if (type & TYPE_BENIGN_SEC) 694 *mode = ES_MODE_GET_BENIGN_SEC_ENTRY; 695 else if (type != TYPE_EXTEND) 696 return false; 697 break; 698 case ES_MODE_GET_BENIGN_SEC_ENTRY: 699 /* Assume unreconized benign secondary entry */ 700 if (!(type & TYPE_BENIGN_SEC)) 701 return false; 702 break; 703 default: 704 return false; 705 } 706 707 return true; 708 } 709 710 struct exfat_dentry *exfat_get_dentry_cached( 711 struct exfat_entry_set_cache *es, int num) 712 { 713 int off = es->start_off + num * DENTRY_SIZE; 714 struct buffer_head *bh = es->bh[exfat_bytes_to_block(es->sb, off)]; 715 char *p = bh->b_data + exfat_block_offset(es->sb, off); 716 717 return (struct exfat_dentry *)p; 718 } 719 720 /* 721 * Returns a set of dentries. 722 * 723 * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached(). 724 * User should call exfat_get_dentry_set() after setting 'modified' to apply 725 * changes made in this entry set to the real device. 726 * 727 * in: 728 * sb+p_dir+entry: indicates a file/dir 729 * num_entries: specifies how many dentries should be included. 730 * It will be set to es->num_entries if it is not 0. 731 * If num_entries is 0, es->num_entries will be obtained 732 * from the first dentry. 733 * out: 734 * es: pointer of entry set on success. 735 * return: 736 * 0 on success 737 * -error code on failure 738 */ 739 static int __exfat_get_dentry_set(struct exfat_entry_set_cache *es, 740 struct super_block *sb, struct exfat_chain *p_dir, int entry, 741 unsigned int num_entries) 742 { 743 int ret, i, num_bh; 744 unsigned int off; 745 sector_t sec; 746 struct exfat_sb_info *sbi = EXFAT_SB(sb); 747 struct buffer_head *bh; 748 749 if (p_dir->dir == DIR_DELETED) { 750 exfat_err(sb, "access to deleted dentry"); 751 return -EIO; 752 } 753 754 ret = exfat_find_location(sb, p_dir, entry, &sec, &off); 755 if (ret) 756 return ret; 757 758 memset(es, 0, sizeof(*es)); 759 es->sb = sb; 760 es->modified = false; 761 es->start_off = off; 762 es->bh = es->__bh; 763 764 bh = sb_bread(sb, sec); 765 if (!bh) 766 return -EIO; 767 es->bh[es->num_bh++] = bh; 768 769 if (num_entries == ES_ALL_ENTRIES) { 770 struct exfat_dentry *ep; 771 772 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 773 if (ep->type != EXFAT_FILE) { 774 brelse(bh); 775 return -EIO; 776 } 777 778 num_entries = ep->dentry.file.num_ext + 1; 779 } 780 781 es->num_entries = num_entries; 782 783 num_bh = exfat_bytes_to_block_round_up(sb, off + num_entries * DENTRY_SIZE); 784 if (num_bh > ARRAY_SIZE(es->__bh)) { 785 es->bh = kmalloc_objs(*es->bh, num_bh, GFP_NOFS); 786 if (!es->bh) { 787 brelse(bh); 788 return -ENOMEM; 789 } 790 es->bh[0] = bh; 791 } 792 793 for (i = 1; i < num_bh; i++) { 794 /* get the next sector */ 795 if (exfat_is_last_sector_in_cluster(sbi, sec)) { 796 unsigned int clu = exfat_sector_to_cluster(sbi, sec); 797 798 if (exfat_cluster_walk(sb, &clu, 1, p_dir->flags)) 799 goto put_es; 800 sec = exfat_cluster_to_sector(sbi, clu); 801 } else { 802 sec++; 803 } 804 805 bh = sb_bread(sb, sec); 806 if (!bh) 807 goto put_es; 808 es->bh[es->num_bh++] = bh; 809 } 810 811 return 0; 812 813 put_es: 814 exfat_put_dentry_set(es, false); 815 return -EIO; 816 } 817 818 int exfat_get_dentry_set(struct exfat_entry_set_cache *es, 819 struct super_block *sb, struct exfat_chain *p_dir, 820 int entry, unsigned int num_entries) 821 { 822 int ret, i; 823 struct exfat_dentry *ep; 824 enum exfat_validate_dentry_mode mode = ES_MODE_GET_FILE_ENTRY; 825 826 ret = __exfat_get_dentry_set(es, sb, p_dir, entry, num_entries); 827 if (ret < 0) 828 return ret; 829 830 /* validate cached dentries */ 831 for (i = ES_IDX_STREAM; i < es->num_entries; i++) { 832 ep = exfat_get_dentry_cached(es, i); 833 if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) 834 goto put_es; 835 } 836 return 0; 837 838 put_es: 839 exfat_put_dentry_set(es, false); 840 return -EIO; 841 } 842 843 static int exfat_validate_empty_dentry_set(struct exfat_entry_set_cache *es) 844 { 845 struct exfat_dentry *ep; 846 struct buffer_head *bh; 847 int i, off; 848 bool unused_hit = false; 849 850 /* 851 * ONLY UNUSED OR DELETED DENTRIES ARE ALLOWED: 852 * Although it violates the specification for a deleted entry to 853 * follow an unused entry, some exFAT implementations could work 854 * like this. Therefore, to improve compatibility, let's allow it. 855 */ 856 for (i = 0; i < es->num_entries; i++) { 857 ep = exfat_get_dentry_cached(es, i); 858 if (ep->type == EXFAT_UNUSED) { 859 unused_hit = true; 860 } else if (!IS_EXFAT_DELETED(ep->type)) { 861 if (unused_hit) 862 goto err_used_follow_unused; 863 i++; 864 goto count_skip_entries; 865 } 866 } 867 868 return 0; 869 870 err_used_follow_unused: 871 off = es->start_off + (i << DENTRY_SIZE_BITS); 872 bh = es->bh[exfat_bytes_to_block(es->sb, off)]; 873 874 exfat_fs_error(es->sb, 875 "in sector %lld, dentry %d should be unused, but 0x%x", 876 bh->b_blocknr, off >> DENTRY_SIZE_BITS, ep->type); 877 878 return -EIO; 879 880 count_skip_entries: 881 es->num_entries = 882 exfat_bytes_to_dentries(exfat_block_to_bytes(es->sb, es->num_bh) - es->start_off); 883 for (; i < es->num_entries; i++) { 884 ep = exfat_get_dentry_cached(es, i); 885 if (IS_EXFAT_DELETED(ep->type)) 886 break; 887 } 888 889 return i; 890 } 891 892 /* 893 * Get an empty dentry set. 894 * 895 * in: 896 * sb+p_dir+entry: indicates the empty dentry location 897 * num_entries: specifies how many empty dentries should be included. 898 * out: 899 * es: pointer of empty dentry set on success. 900 * return: 901 * 0 : on success 902 * >0 : the dentries are not empty, the return value is the number of 903 * dentries to be skipped for the next lookup. 904 * <0 : on failure 905 */ 906 int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es, 907 struct super_block *sb, struct exfat_chain *p_dir, 908 int entry, unsigned int num_entries) 909 { 910 int ret; 911 912 ret = __exfat_get_dentry_set(es, sb, p_dir, entry, num_entries); 913 if (ret < 0) 914 return ret; 915 916 ret = exfat_validate_empty_dentry_set(es); 917 if (ret) 918 exfat_put_dentry_set(es, false); 919 920 return ret; 921 } 922 923 static inline void exfat_reset_empty_hint(struct exfat_hint_femp *hint_femp) 924 { 925 hint_femp->eidx = EXFAT_HINT_NONE; 926 hint_femp->count = 0; 927 } 928 929 static inline void exfat_set_empty_hint(struct exfat_inode_info *ei, 930 struct exfat_hint_femp *candi_empty, struct exfat_chain *clu, 931 int dentry, int num_entries, int entry_type) 932 { 933 if (ei->hint_femp.eidx == EXFAT_HINT_NONE || 934 ei->hint_femp.eidx > dentry) { 935 int total_entries = exfat_bytes_to_dentries(i_size_read(&ei->vfs_inode)); 936 937 if (candi_empty->count == 0) { 938 candi_empty->cur = *clu; 939 candi_empty->eidx = dentry; 940 } 941 942 if (entry_type == TYPE_UNUSED) 943 candi_empty->count += total_entries - dentry; 944 else 945 candi_empty->count++; 946 947 if (candi_empty->count == num_entries || 948 candi_empty->count + candi_empty->eidx == total_entries) 949 ei->hint_femp = *candi_empty; 950 } 951 } 952 953 enum { 954 DIRENT_STEP_FILE, 955 DIRENT_STEP_STRM, 956 DIRENT_STEP_NAME, 957 DIRENT_STEP_SECD, 958 }; 959 960 /* 961 * @ei: inode info of parent directory 962 * @p_dir: directory structure of parent directory 963 * @num_entries:entry size of p_uniname 964 * @hint_opt: If p_uniname is found, filled with optimized dir/entry 965 * for traversing cluster chain. 966 * @return: 967 * >= 0: file directory entry position where the name exists 968 * -ENOENT: entry with the name does not exist 969 * -EIO: I/O error 970 */ 971 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, 972 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 973 struct exfat_hint *hint_opt) 974 { 975 int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; 976 int order, step, name_len = 0; 977 int dentries_per_clu; 978 unsigned int entry_type; 979 unsigned short *uniname = NULL; 980 struct exfat_chain clu; 981 struct exfat_hint *hint_stat = &ei->hint_stat; 982 struct exfat_hint_femp candi_empty; 983 struct exfat_sb_info *sbi = EXFAT_SB(sb); 984 int num_entries = exfat_calc_num_entries(p_uniname); 985 unsigned int clu_count = 0; 986 987 if (num_entries < 0) 988 return num_entries; 989 990 dentries_per_clu = sbi->dentries_per_clu; 991 992 exfat_chain_dup(&clu, p_dir); 993 994 if (hint_stat->eidx) { 995 clu.dir = hint_stat->clu; 996 dentry = hint_stat->eidx; 997 end_eidx = dentry; 998 } 999 1000 exfat_reset_empty_hint(&ei->hint_femp); 1001 1002 rewind: 1003 order = 0; 1004 step = DIRENT_STEP_FILE; 1005 exfat_reset_empty_hint(&candi_empty); 1006 1007 while (clu.dir != EXFAT_EOF_CLUSTER) { 1008 i = dentry & (dentries_per_clu - 1); 1009 for (; i < dentries_per_clu; i++, dentry++) { 1010 struct exfat_dentry *ep; 1011 struct buffer_head *bh; 1012 1013 if (rewind && dentry == end_eidx) 1014 goto not_found; 1015 1016 ep = exfat_get_dentry(sb, &clu, i, &bh); 1017 if (!ep) 1018 return -EIO; 1019 1020 entry_type = exfat_get_entry_type(ep); 1021 1022 if (entry_type == TYPE_UNUSED || 1023 entry_type == TYPE_DELETED) { 1024 step = DIRENT_STEP_FILE; 1025 1026 exfat_set_empty_hint(ei, &candi_empty, &clu, 1027 dentry, num_entries, 1028 entry_type); 1029 1030 brelse(bh); 1031 if (entry_type == TYPE_UNUSED) 1032 goto not_found; 1033 continue; 1034 } 1035 1036 exfat_reset_empty_hint(&candi_empty); 1037 1038 if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { 1039 step = DIRENT_STEP_FILE; 1040 hint_opt->clu = clu.dir; 1041 hint_opt->eidx = i; 1042 num_ext = ep->dentry.file.num_ext; 1043 step = DIRENT_STEP_STRM; 1044 brelse(bh); 1045 continue; 1046 } 1047 1048 if (entry_type == TYPE_STREAM) { 1049 u16 name_hash; 1050 1051 if (step != DIRENT_STEP_STRM) { 1052 step = DIRENT_STEP_FILE; 1053 brelse(bh); 1054 continue; 1055 } 1056 step = DIRENT_STEP_FILE; 1057 name_hash = le16_to_cpu( 1058 ep->dentry.stream.name_hash); 1059 if (p_uniname->name_hash == name_hash && 1060 p_uniname->name_len == 1061 ep->dentry.stream.name_len) { 1062 step = DIRENT_STEP_NAME; 1063 order = 1; 1064 name_len = 0; 1065 } 1066 brelse(bh); 1067 continue; 1068 } 1069 1070 if (entry_type == TYPE_EXTEND) { 1071 unsigned short entry_uniname[16], unichar; 1072 unsigned int offset; 1073 1074 if (step != DIRENT_STEP_NAME || 1075 name_len >= MAX_NAME_LENGTH) { 1076 brelse(bh); 1077 step = DIRENT_STEP_FILE; 1078 continue; 1079 } 1080 1081 offset = (++order - 2) * EXFAT_FILE_NAME_LEN; 1082 len = exfat_extract_uni_name(ep, entry_uniname); 1083 brelse(bh); 1084 if (offset > MAX_NAME_LENGTH || 1085 len > MAX_NAME_LENGTH - offset) { 1086 step = DIRENT_STEP_FILE; 1087 continue; 1088 } 1089 uniname = p_uniname->name + offset; 1090 name_len += len; 1091 1092 unichar = *(uniname+len); 1093 *(uniname+len) = 0x0; 1094 1095 if (exfat_uniname_ncmp(sb, uniname, 1096 entry_uniname, len)) { 1097 step = DIRENT_STEP_FILE; 1098 } else if (p_uniname->name_len == name_len) { 1099 if (order == num_ext) 1100 goto found; 1101 step = DIRENT_STEP_SECD; 1102 } 1103 1104 *(uniname+len) = unichar; 1105 continue; 1106 } 1107 1108 brelse(bh); 1109 if (entry_type & 1110 (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { 1111 if (step == DIRENT_STEP_SECD) { 1112 if (++order == num_ext) 1113 goto found; 1114 continue; 1115 } 1116 } 1117 step = DIRENT_STEP_FILE; 1118 } 1119 1120 if (exfat_chain_advance(sb, &clu, 1)) 1121 return -EIO; 1122 1123 /* break if the cluster chain includes a loop */ 1124 if (unlikely(++clu_count > EXFAT_DATA_CLUSTER_COUNT(sbi))) 1125 goto not_found; 1126 } 1127 1128 not_found: 1129 /* 1130 * We started at not 0 index,so we should try to find target 1131 * from 0 index to the index we started at. 1132 */ 1133 if (!rewind && end_eidx) { 1134 rewind = 1; 1135 dentry = 0; 1136 clu.dir = p_dir->dir; 1137 goto rewind; 1138 } 1139 1140 /* 1141 * set the EXFAT_EOF_CLUSTER flag to avoid search 1142 * from the beginning again when allocated a new cluster 1143 */ 1144 if (ei->hint_femp.eidx == EXFAT_HINT_NONE) { 1145 ei->hint_femp.cur.dir = EXFAT_EOF_CLUSTER; 1146 ei->hint_femp.eidx = p_dir->size * dentries_per_clu; 1147 ei->hint_femp.count = 0; 1148 } 1149 1150 /* initialized hint_stat */ 1151 hint_stat->clu = p_dir->dir; 1152 hint_stat->eidx = 0; 1153 return -ENOENT; 1154 1155 found: 1156 /* next dentry we'll find is out of this cluster */ 1157 if (!((dentry + 1) & (dentries_per_clu - 1))) { 1158 int ret = 0; 1159 1160 ret = exfat_chain_advance(sb, &clu, 1); 1161 1162 if (ret || clu.dir == EXFAT_EOF_CLUSTER) { 1163 /* just initialized hint_stat */ 1164 hint_stat->clu = p_dir->dir; 1165 hint_stat->eidx = 0; 1166 return (dentry - num_ext); 1167 } 1168 } 1169 1170 hint_stat->clu = clu.dir; 1171 hint_stat->eidx = dentry + 1; 1172 return dentry - num_ext; 1173 } 1174 1175 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) 1176 { 1177 int i, count = 0; 1178 int dentries_per_clu; 1179 unsigned int entry_type; 1180 unsigned int clu_count = 0; 1181 struct exfat_chain clu; 1182 struct exfat_dentry *ep; 1183 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1184 struct buffer_head *bh; 1185 1186 dentries_per_clu = sbi->dentries_per_clu; 1187 1188 exfat_chain_dup(&clu, p_dir); 1189 1190 while (clu.dir != EXFAT_EOF_CLUSTER) { 1191 for (i = 0; i < dentries_per_clu; i++) { 1192 ep = exfat_get_dentry(sb, &clu, i, &bh); 1193 if (!ep) 1194 return -EIO; 1195 entry_type = exfat_get_entry_type(ep); 1196 brelse(bh); 1197 1198 if (entry_type == TYPE_UNUSED) 1199 return count; 1200 if (entry_type != TYPE_DIR) 1201 continue; 1202 count++; 1203 } 1204 1205 if (exfat_chain_advance(sb, &clu, 1)) 1206 return -EIO; 1207 1208 if (unlikely(++clu_count > sbi->used_clusters)) { 1209 exfat_fs_error(sb, "FAT or bitmap is corrupted"); 1210 return -EIO; 1211 } 1212 } 1213 1214 return count; 1215 } 1216 1217 static int exfat_get_volume_label_dentry(struct super_block *sb, 1218 struct exfat_entry_set_cache *es) 1219 { 1220 int i; 1221 int dentry = 0; 1222 unsigned int type; 1223 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1224 struct exfat_hint_femp hint_femp; 1225 struct exfat_inode_info *ei = EXFAT_I(sb->s_root->d_inode); 1226 struct exfat_chain clu; 1227 struct exfat_dentry *ep; 1228 struct buffer_head *bh; 1229 1230 hint_femp.eidx = EXFAT_HINT_NONE; 1231 exfat_chain_set(&clu, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 1232 1233 while (clu.dir != EXFAT_EOF_CLUSTER) { 1234 for (i = 0; i < sbi->dentries_per_clu; i++, dentry++) { 1235 ep = exfat_get_dentry(sb, &clu, i, &bh); 1236 if (!ep) 1237 return -EIO; 1238 1239 type = exfat_get_entry_type(ep); 1240 if (hint_femp.eidx == EXFAT_HINT_NONE) { 1241 if (type == TYPE_DELETED || type == TYPE_UNUSED) { 1242 hint_femp.cur = clu; 1243 hint_femp.eidx = dentry; 1244 hint_femp.count = 1; 1245 } 1246 } 1247 1248 if (type == TYPE_UNUSED) { 1249 brelse(bh); 1250 goto not_found; 1251 } 1252 1253 if (type != TYPE_VOLUME) { 1254 brelse(bh); 1255 continue; 1256 } 1257 1258 memset(es, 0, sizeof(*es)); 1259 es->sb = sb; 1260 es->bh = es->__bh; 1261 es->bh[0] = bh; 1262 es->num_bh = 1; 1263 es->start_off = exfat_dentries_to_bytes(i) % sb->s_blocksize; 1264 1265 return 0; 1266 } 1267 1268 if (exfat_get_next_cluster(sb, &(clu.dir))) 1269 return -EIO; 1270 } 1271 1272 not_found: 1273 if (hint_femp.eidx == EXFAT_HINT_NONE) { 1274 hint_femp.cur.dir = EXFAT_EOF_CLUSTER; 1275 hint_femp.eidx = dentry; 1276 hint_femp.count = 0; 1277 } 1278 1279 ei->hint_femp = hint_femp; 1280 1281 return -ENOENT; 1282 } 1283 1284 int exfat_read_volume_label(struct super_block *sb, struct exfat_uni_name *label_out) 1285 { 1286 int ret, i; 1287 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1288 struct exfat_entry_set_cache es; 1289 struct exfat_dentry *ep; 1290 1291 mutex_lock(&sbi->s_lock); 1292 1293 memset(label_out, 0, sizeof(*label_out)); 1294 ret = exfat_get_volume_label_dentry(sb, &es); 1295 if (ret < 0) { 1296 /* 1297 * ENOENT signifies that a volume label dentry doesn't exist 1298 * We will treat this as an empty volume label and not fail. 1299 */ 1300 if (ret == -ENOENT) 1301 ret = 0; 1302 1303 goto unlock; 1304 } 1305 1306 ep = exfat_get_dentry_cached(&es, 0); 1307 label_out->name_len = ep->dentry.volume_label.char_count; 1308 if (label_out->name_len > EXFAT_VOLUME_LABEL_LEN) { 1309 ret = -EIO; 1310 exfat_put_dentry_set(&es, false); 1311 goto unlock; 1312 } 1313 1314 for (i = 0; i < label_out->name_len; i++) 1315 label_out->name[i] = le16_to_cpu(ep->dentry.volume_label.volume_label[i]); 1316 1317 exfat_put_dentry_set(&es, false); 1318 unlock: 1319 mutex_unlock(&sbi->s_lock); 1320 return ret; 1321 } 1322 1323 int exfat_write_volume_label(struct super_block *sb, 1324 struct exfat_uni_name *label) 1325 { 1326 int ret, i; 1327 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1328 struct inode *root_inode = sb->s_root->d_inode; 1329 struct exfat_entry_set_cache es; 1330 struct exfat_chain clu; 1331 struct exfat_dentry *ep; 1332 1333 if (label->name_len > EXFAT_VOLUME_LABEL_LEN) 1334 return -EINVAL; 1335 1336 mutex_lock(&sbi->s_lock); 1337 1338 ret = exfat_get_volume_label_dentry(sb, &es); 1339 if (ret == -ENOENT) { 1340 if (label->name_len == 0) { 1341 /* No volume label dentry, no need to clear */ 1342 ret = 0; 1343 goto unlock; 1344 } 1345 1346 ret = exfat_find_empty_entry(root_inode, &clu, 1, &es); 1347 } 1348 1349 if (ret < 0) 1350 goto unlock; 1351 1352 ep = exfat_get_dentry_cached(&es, 0); 1353 1354 if (label->name_len == 0 && ep->dentry.volume_label.char_count == 0) { 1355 /* volume label had been cleared */ 1356 exfat_put_dentry_set(&es, 0); 1357 goto unlock; 1358 } 1359 1360 memset(ep, 0, sizeof(*ep)); 1361 ep->type = EXFAT_VOLUME; 1362 1363 for (i = 0; i < label->name_len; i++) 1364 ep->dentry.volume_label.volume_label[i] = 1365 cpu_to_le16(label->name[i]); 1366 1367 ep->dentry.volume_label.char_count = label->name_len; 1368 es.modified = true; 1369 1370 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(root_inode)); 1371 1372 unlock: 1373 mutex_unlock(&sbi->s_lock); 1374 return ret; 1375 } 1376