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 = (unsigned int)min_t(u64, 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 ret = exfat_zeroed_cluster(inode, clu->dir); 303 if (ret) { 304 exfat_free_cluster(inode, clu); 305 return ret; 306 } 307 308 return 0; 309 } 310 311 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname) 312 { 313 int len; 314 315 len = p_uniname->name_len; 316 if (len == 0) 317 return -EINVAL; 318 319 /* 1 file entry + 1 stream entry + name entries */ 320 return ES_ENTRY_NUM(len); 321 } 322 323 unsigned int exfat_get_entry_type(struct exfat_dentry *ep) 324 { 325 if (ep->type == EXFAT_UNUSED) 326 return TYPE_UNUSED; 327 if (IS_EXFAT_DELETED(ep->type)) 328 return TYPE_DELETED; 329 if (ep->type == EXFAT_INVAL) 330 return TYPE_INVALID; 331 if (IS_EXFAT_CRITICAL_PRI(ep->type)) { 332 if (ep->type == EXFAT_BITMAP) 333 return TYPE_BITMAP; 334 if (ep->type == EXFAT_UPCASE) 335 return TYPE_UPCASE; 336 if (ep->type == EXFAT_VOLUME) 337 return TYPE_VOLUME; 338 if (ep->type == EXFAT_FILE) { 339 if (le16_to_cpu(ep->dentry.file.attr) & EXFAT_ATTR_SUBDIR) 340 return TYPE_DIR; 341 return TYPE_FILE; 342 } 343 return TYPE_CRITICAL_PRI; 344 } 345 if (IS_EXFAT_BENIGN_PRI(ep->type)) { 346 if (ep->type == EXFAT_GUID) 347 return TYPE_GUID; 348 if (ep->type == EXFAT_PADDING) 349 return TYPE_PADDING; 350 if (ep->type == EXFAT_ACLTAB) 351 return TYPE_ACLTAB; 352 return TYPE_BENIGN_PRI; 353 } 354 if (IS_EXFAT_CRITICAL_SEC(ep->type)) { 355 if (ep->type == EXFAT_STREAM) 356 return TYPE_STREAM; 357 if (ep->type == EXFAT_NAME) 358 return TYPE_EXTEND; 359 if (ep->type == EXFAT_ACL) 360 return TYPE_ACL; 361 return TYPE_CRITICAL_SEC; 362 } 363 364 if (ep->type == EXFAT_VENDOR_EXT) 365 return TYPE_VENDOR_EXT; 366 if (ep->type == EXFAT_VENDOR_ALLOC) 367 return TYPE_VENDOR_ALLOC; 368 369 return TYPE_BENIGN_SEC; 370 } 371 372 static void exfat_set_entry_type(struct exfat_dentry *ep, unsigned int type) 373 { 374 if (type == TYPE_UNUSED) { 375 ep->type = EXFAT_UNUSED; 376 } else if (type == TYPE_DELETED) { 377 ep->type &= EXFAT_DELETE; 378 } else if (type == TYPE_STREAM) { 379 ep->type = EXFAT_STREAM; 380 } else if (type == TYPE_EXTEND) { 381 ep->type = EXFAT_NAME; 382 } else if (type == TYPE_BITMAP) { 383 ep->type = EXFAT_BITMAP; 384 } else if (type == TYPE_UPCASE) { 385 ep->type = EXFAT_UPCASE; 386 } else if (type == TYPE_VOLUME) { 387 ep->type = EXFAT_VOLUME; 388 } else if (type == TYPE_DIR) { 389 ep->type = EXFAT_FILE; 390 ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_SUBDIR); 391 } else if (type == TYPE_FILE) { 392 ep->type = EXFAT_FILE; 393 ep->dentry.file.attr = cpu_to_le16(EXFAT_ATTR_ARCHIVE); 394 } 395 } 396 397 static void exfat_init_stream_entry(struct exfat_dentry *ep, 398 unsigned int start_clu, unsigned long long size) 399 { 400 memset(ep, 0, sizeof(*ep)); 401 exfat_set_entry_type(ep, TYPE_STREAM); 402 if (size == 0) 403 ep->dentry.stream.flags = ALLOC_FAT_CHAIN; 404 else 405 ep->dentry.stream.flags = ALLOC_NO_FAT_CHAIN; 406 ep->dentry.stream.start_clu = cpu_to_le32(start_clu); 407 ep->dentry.stream.valid_size = cpu_to_le64(size); 408 ep->dentry.stream.size = cpu_to_le64(size); 409 } 410 411 static void exfat_init_name_entry(struct exfat_dentry *ep, 412 unsigned short *uniname) 413 { 414 int i; 415 416 exfat_set_entry_type(ep, TYPE_EXTEND); 417 ep->dentry.name.flags = 0x0; 418 419 for (i = 0; i < EXFAT_FILE_NAME_LEN; i++) { 420 if (*uniname != 0x0) { 421 ep->dentry.name.unicode_0_14[i] = cpu_to_le16(*uniname); 422 uniname++; 423 } else { 424 ep->dentry.name.unicode_0_14[i] = 0x0; 425 } 426 } 427 } 428 429 void exfat_init_dir_entry(struct exfat_entry_set_cache *es, 430 unsigned int type, unsigned int start_clu, 431 unsigned long long size, struct timespec64 *ts) 432 { 433 struct super_block *sb = es->sb; 434 struct exfat_sb_info *sbi = EXFAT_SB(sb); 435 struct exfat_dentry *ep; 436 437 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 438 memset(ep, 0, sizeof(*ep)); 439 exfat_set_entry_type(ep, type); 440 exfat_set_entry_time(sbi, ts, 441 &ep->dentry.file.create_tz, 442 &ep->dentry.file.create_time, 443 &ep->dentry.file.create_date, 444 &ep->dentry.file.create_time_cs); 445 exfat_set_entry_time(sbi, ts, 446 &ep->dentry.file.modify_tz, 447 &ep->dentry.file.modify_time, 448 &ep->dentry.file.modify_date, 449 &ep->dentry.file.modify_time_cs); 450 exfat_set_entry_time(sbi, ts, 451 &ep->dentry.file.access_tz, 452 &ep->dentry.file.access_time, 453 &ep->dentry.file.access_date, 454 NULL); 455 456 ep = exfat_get_dentry_cached(es, ES_IDX_STREAM); 457 exfat_init_stream_entry(ep, start_clu, size); 458 } 459 460 static void exfat_free_benign_secondary_clusters(struct inode *inode, 461 struct exfat_dentry *ep) 462 { 463 struct super_block *sb = inode->i_sb; 464 struct exfat_chain dir; 465 unsigned int start_clu = 466 le32_to_cpu(ep->dentry.generic_secondary.start_clu); 467 u64 size = le64_to_cpu(ep->dentry.generic_secondary.size); 468 unsigned char flags = ep->dentry.generic_secondary.flags; 469 470 if (!(flags & ALLOC_POSSIBLE) || !start_clu || !size) 471 return; 472 473 exfat_chain_set(&dir, start_clu, 474 exfat_bytes_to_cluster_round_up(EXFAT_SB(sb), size), 475 flags); 476 exfat_free_cluster(inode, &dir); 477 } 478 479 /* 480 * exfat_init_ext_entry - initialize extension entries in a directory entry set 481 * @es: target entry set 482 * @num_entries: number of entries excluding benign secondary entries 483 * @p_uniname: filename to store 484 * @old_es: optional source entry set with benign secondary entries, or NULL 485 * @num_extra: number of benign secondary entries to copy from @old_es 486 * 487 * Set up the file, stream extension, and filename entries in @es, optionally 488 * preserving @num_extra benign secondary entries from @old_es. @es and @old_es 489 * may refer to the same entry set; excess entries are marked as deleted. 490 */ 491 void exfat_init_ext_entry(struct exfat_entry_set_cache *es, int num_entries, 492 struct exfat_uni_name *p_uniname, 493 struct exfat_entry_set_cache *old_es, int num_extra) 494 { 495 int i, src_start = 0, old_num; 496 unsigned short *uniname = p_uniname->name; 497 struct exfat_dentry *ep; 498 499 if (WARN_ON(num_extra < 0 || (num_extra && (!old_es || 500 old_es->num_entries < ES_IDX_FIRST_FILENAME + num_extra)))) 501 num_extra = 0; 502 503 /* 504 * Save old entry count and source position before modifying 505 * es->num_entries, since old_es and es may point to the same 506 * entry set. 507 */ 508 old_num = es->num_entries; 509 if (old_es && num_extra > 0) 510 src_start = old_es->num_entries - num_extra; 511 512 es->num_entries = num_entries + num_extra; 513 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 514 ep->dentry.file.num_ext = (unsigned char)(num_entries - 1 + num_extra); 515 516 ep = exfat_get_dentry_cached(es, ES_IDX_STREAM); 517 ep->dentry.stream.name_len = p_uniname->name_len; 518 ep->dentry.stream.name_hash = cpu_to_le16(p_uniname->name_hash); 519 520 if (old_es && num_extra > 0) { 521 for (i = 0; i < num_extra; i++) 522 *exfat_get_dentry_cached(es, num_entries + i) = 523 *exfat_get_dentry_cached(old_es, src_start + i); 524 } 525 526 for (i = ES_IDX_FIRST_FILENAME; i < num_entries; i++) { 527 ep = exfat_get_dentry_cached(es, i); 528 exfat_init_name_entry(ep, uniname); 529 uniname += EXFAT_FILE_NAME_LEN; 530 } 531 532 /* Mark excess old entries as deleted (in-place shrink) */ 533 for (i = num_entries + num_extra; i < old_num; i++) { 534 ep = exfat_get_dentry_cached(es, i); 535 exfat_set_entry_type(ep, TYPE_DELETED); 536 } 537 538 exfat_update_dir_chksum(es); 539 } 540 541 void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es, 542 int order, bool free_benign) 543 { 544 int i; 545 struct exfat_dentry *ep; 546 547 for (i = order; i < es->num_entries; i++) { 548 ep = exfat_get_dentry_cached(es, i); 549 550 if (free_benign && (exfat_get_entry_type(ep) & TYPE_BENIGN_SEC)) 551 exfat_free_benign_secondary_clusters(inode, ep); 552 553 exfat_set_entry_type(ep, TYPE_DELETED); 554 } 555 556 if (order < es->num_entries) 557 es->modified = true; 558 } 559 560 void exfat_update_dir_chksum(struct exfat_entry_set_cache *es) 561 { 562 int chksum_type = CS_DIR_ENTRY, i; 563 unsigned short chksum = 0; 564 struct exfat_dentry *ep; 565 566 for (i = ES_IDX_FILE; i < es->num_entries; i++) { 567 ep = exfat_get_dentry_cached(es, i); 568 chksum = exfat_calc_chksum16(ep, DENTRY_SIZE, chksum, 569 chksum_type); 570 chksum_type = CS_DEFAULT; 571 } 572 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 573 ep->dentry.file.checksum = cpu_to_le16(chksum); 574 es->modified = true; 575 } 576 577 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync) 578 { 579 int i, err = 0; 580 581 if (es->modified) 582 err = exfat_update_bhs(es->bh, es->num_bh, sync); 583 584 for (i = 0; i < es->num_bh; i++) 585 if (err) 586 bforget(es->bh[i]); 587 else 588 brelse(es->bh[i]); 589 590 if (IS_DYNAMIC_ES(es)) 591 kfree(es->bh); 592 593 return err; 594 } 595 596 static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, 597 int entry, sector_t *sector, int *offset) 598 { 599 int ret; 600 unsigned int off, clu = 0; 601 struct exfat_sb_info *sbi = EXFAT_SB(sb); 602 603 off = exfat_dentries_to_bytes(entry); 604 605 clu = p_dir->dir; 606 ret = exfat_cluster_walk(sb, &clu, exfat_bytes_to_cluster(sbi, off), 607 p_dir->flags); 608 if (ret) 609 return ret; 610 611 if (clu == EXFAT_EOF_CLUSTER) { 612 exfat_fs_error(sb, 613 "unexpected early break in cluster chain (clu : %u, len : %d)", 614 p_dir->dir, 615 exfat_bytes_to_cluster(sbi, off)); 616 return -EIO; 617 } 618 619 if (!exfat_test_bitmap(sb, clu)) { 620 exfat_err(sb, "failed to test cluster bit(%u)", clu); 621 return -EIO; 622 } 623 624 /* byte offset in cluster */ 625 off = exfat_cluster_offset(sbi, off); 626 627 /* byte offset in sector */ 628 *offset = exfat_block_offset(sb, off); 629 630 /* sector offset in cluster */ 631 *sector = exfat_bytes_to_block(sb, off); 632 *sector += exfat_cluster_to_sector(sbi, clu); 633 return 0; 634 } 635 636 struct exfat_dentry *exfat_get_dentry(struct super_block *sb, 637 struct exfat_chain *p_dir, int entry, struct buffer_head **bh) 638 { 639 struct exfat_sb_info *sbi = EXFAT_SB(sb); 640 unsigned int sect_per_clus = sbi->sect_per_clus; 641 unsigned int dentries_per_page = exfat_bytes_to_dentries(PAGE_SIZE); 642 int off; 643 sector_t sec; 644 645 if (p_dir->dir == DIR_DELETED) { 646 exfat_err(sb, "abnormal access to deleted dentry"); 647 return NULL; 648 } 649 650 if (exfat_find_location(sb, p_dir, entry, &sec, &off)) 651 return NULL; 652 653 if (sect_per_clus > 1 && 654 (entry & (dentries_per_page - 1)) == 0) { 655 sector_t ra = sec; 656 blkcnt_t cnt = 0; 657 unsigned int ra_count = sect_per_clus; 658 659 /* Not sector aligned with ra_count, resize ra_count to page size */ 660 if ((sec - sbi->data_start_sector) & (ra_count - 1)) 661 ra_count = PAGE_SIZE >> sb->s_blocksize_bits; 662 663 exfat_blk_readahead(sb, sec, &ra, &cnt, sec + ra_count - 1); 664 } 665 666 *bh = sb_bread(sb, sec); 667 if (!*bh) 668 return NULL; 669 670 return (struct exfat_dentry *)((*bh)->b_data + off); 671 } 672 673 enum exfat_validate_dentry_mode { 674 ES_MODE_GET_FILE_ENTRY, 675 ES_MODE_GET_STRM_ENTRY, 676 ES_MODE_GET_NAME_ENTRY, 677 ES_MODE_GET_CRITICAL_SEC_ENTRY, 678 ES_MODE_GET_BENIGN_SEC_ENTRY, 679 }; 680 681 static bool exfat_validate_entry(unsigned int type, 682 enum exfat_validate_dentry_mode *mode) 683 { 684 if (type == TYPE_UNUSED || type == TYPE_DELETED) 685 return false; 686 687 switch (*mode) { 688 case ES_MODE_GET_FILE_ENTRY: 689 if (type != TYPE_STREAM) 690 return false; 691 *mode = ES_MODE_GET_STRM_ENTRY; 692 break; 693 case ES_MODE_GET_STRM_ENTRY: 694 if (type != TYPE_EXTEND) 695 return false; 696 *mode = ES_MODE_GET_NAME_ENTRY; 697 break; 698 case ES_MODE_GET_NAME_ENTRY: 699 if (type & TYPE_BENIGN_SEC) 700 *mode = ES_MODE_GET_BENIGN_SEC_ENTRY; 701 else if (type != TYPE_EXTEND) 702 return false; 703 break; 704 case ES_MODE_GET_BENIGN_SEC_ENTRY: 705 /* Assume unreconized benign secondary entry */ 706 if (!(type & TYPE_BENIGN_SEC)) 707 return false; 708 break; 709 default: 710 return false; 711 } 712 713 return true; 714 } 715 716 struct exfat_dentry *exfat_get_dentry_cached( 717 struct exfat_entry_set_cache *es, int num) 718 { 719 int off = es->start_off + num * DENTRY_SIZE; 720 struct buffer_head *bh = es->bh[exfat_bytes_to_block(es->sb, off)]; 721 char *p = bh->b_data + exfat_block_offset(es->sb, off); 722 723 return (struct exfat_dentry *)p; 724 } 725 726 /* 727 * Returns a set of dentries. 728 * 729 * Note It provides a direct pointer to bh->data via exfat_get_dentry_cached(). 730 * User should call exfat_get_dentry_set() after setting 'modified' to apply 731 * changes made in this entry set to the real device. 732 * 733 * in: 734 * sb+p_dir+entry: indicates a file/dir 735 * num_entries: specifies how many dentries should be included. 736 * It will be set to es->num_entries if it is not 0. 737 * If num_entries is 0, es->num_entries will be obtained 738 * from the first dentry. 739 * out: 740 * es: pointer of entry set on success. 741 * return: 742 * 0 on success 743 * -error code on failure 744 */ 745 static int __exfat_get_dentry_set(struct exfat_entry_set_cache *es, 746 struct super_block *sb, struct exfat_chain *p_dir, int entry, 747 unsigned int num_entries) 748 { 749 int ret, i, num_bh; 750 unsigned int off; 751 sector_t sec; 752 struct exfat_sb_info *sbi = EXFAT_SB(sb); 753 struct buffer_head *bh; 754 755 if (p_dir->dir == DIR_DELETED) { 756 exfat_err(sb, "access to deleted dentry"); 757 return -EIO; 758 } 759 760 ret = exfat_find_location(sb, p_dir, entry, &sec, &off); 761 if (ret) 762 return ret; 763 764 memset(es, 0, sizeof(*es)); 765 es->sb = sb; 766 es->modified = false; 767 es->start_off = off; 768 es->bh = es->__bh; 769 770 bh = sb_bread(sb, sec); 771 if (!bh) 772 return -EIO; 773 es->bh[es->num_bh++] = bh; 774 775 if (num_entries == ES_ALL_ENTRIES) { 776 struct exfat_dentry *ep; 777 778 ep = exfat_get_dentry_cached(es, ES_IDX_FILE); 779 if (ep->type != EXFAT_FILE) { 780 brelse(bh); 781 return -EIO; 782 } 783 784 num_entries = ep->dentry.file.num_ext + 1; 785 } 786 787 es->num_entries = num_entries; 788 789 num_bh = exfat_bytes_to_block_round_up(sb, off + num_entries * DENTRY_SIZE); 790 if (num_bh > ARRAY_SIZE(es->__bh)) { 791 es->bh = kmalloc_objs(*es->bh, num_bh, GFP_NOFS); 792 if (!es->bh) { 793 brelse(bh); 794 return -ENOMEM; 795 } 796 es->bh[0] = bh; 797 } 798 799 for (i = 1; i < num_bh; i++) { 800 /* get the next sector */ 801 if (exfat_is_last_sector_in_cluster(sbi, sec)) { 802 unsigned int clu = exfat_sector_to_cluster(sbi, sec); 803 804 if (exfat_cluster_walk(sb, &clu, 1, p_dir->flags)) 805 goto put_es; 806 sec = exfat_cluster_to_sector(sbi, clu); 807 } else { 808 sec++; 809 } 810 811 bh = sb_bread(sb, sec); 812 if (!bh) 813 goto put_es; 814 es->bh[es->num_bh++] = bh; 815 } 816 817 return 0; 818 819 put_es: 820 exfat_put_dentry_set(es, false); 821 return -EIO; 822 } 823 824 int exfat_get_dentry_set(struct exfat_entry_set_cache *es, 825 struct super_block *sb, struct exfat_chain *p_dir, 826 int entry, unsigned int num_entries) 827 { 828 int ret, i; 829 struct exfat_dentry *ep; 830 enum exfat_validate_dentry_mode mode = ES_MODE_GET_FILE_ENTRY; 831 832 ret = __exfat_get_dentry_set(es, sb, p_dir, entry, num_entries); 833 if (ret < 0) 834 return ret; 835 836 /* validate cached dentries */ 837 for (i = ES_IDX_STREAM; i < es->num_entries; i++) { 838 ep = exfat_get_dentry_cached(es, i); 839 if (!exfat_validate_entry(exfat_get_entry_type(ep), &mode)) 840 goto put_es; 841 } 842 return 0; 843 844 put_es: 845 exfat_put_dentry_set(es, false); 846 return -EIO; 847 } 848 849 static int exfat_validate_empty_dentry_set(struct exfat_entry_set_cache *es) 850 { 851 struct exfat_dentry *ep; 852 struct buffer_head *bh; 853 int i, off; 854 bool unused_hit = false; 855 856 /* 857 * ONLY UNUSED OR DELETED DENTRIES ARE ALLOWED: 858 * Although it violates the specification for a deleted entry to 859 * follow an unused entry, some exFAT implementations could work 860 * like this. Therefore, to improve compatibility, let's allow it. 861 */ 862 for (i = 0; i < es->num_entries; i++) { 863 ep = exfat_get_dentry_cached(es, i); 864 if (ep->type == EXFAT_UNUSED) { 865 unused_hit = true; 866 } else if (!IS_EXFAT_DELETED(ep->type)) { 867 if (unused_hit) 868 goto err_used_follow_unused; 869 i++; 870 goto count_skip_entries; 871 } 872 } 873 874 return 0; 875 876 err_used_follow_unused: 877 off = es->start_off + (i << DENTRY_SIZE_BITS); 878 bh = es->bh[exfat_bytes_to_block(es->sb, off)]; 879 880 exfat_fs_error(es->sb, 881 "in sector %lld, dentry %d should be unused, but 0x%x", 882 bh->b_blocknr, off >> DENTRY_SIZE_BITS, ep->type); 883 884 return -EIO; 885 886 count_skip_entries: 887 es->num_entries = 888 exfat_bytes_to_dentries(exfat_block_to_bytes(es->sb, es->num_bh) - es->start_off); 889 for (; i < es->num_entries; i++) { 890 ep = exfat_get_dentry_cached(es, i); 891 if (IS_EXFAT_DELETED(ep->type)) 892 break; 893 } 894 895 return i; 896 } 897 898 /* 899 * Get an empty dentry set. 900 * 901 * in: 902 * sb+p_dir+entry: indicates the empty dentry location 903 * num_entries: specifies how many empty dentries should be included. 904 * out: 905 * es: pointer of empty dentry set on success. 906 * return: 907 * 0 : on success 908 * >0 : the dentries are not empty, the return value is the number of 909 * dentries to be skipped for the next lookup. 910 * <0 : on failure 911 */ 912 int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es, 913 struct super_block *sb, struct exfat_chain *p_dir, 914 int entry, unsigned int num_entries) 915 { 916 int ret; 917 918 ret = __exfat_get_dentry_set(es, sb, p_dir, entry, num_entries); 919 if (ret < 0) 920 return ret; 921 922 ret = exfat_validate_empty_dentry_set(es); 923 if (ret) 924 exfat_put_dentry_set(es, false); 925 926 return ret; 927 } 928 929 static inline void exfat_reset_empty_hint(struct exfat_hint_femp *hint_femp) 930 { 931 hint_femp->eidx = EXFAT_HINT_NONE; 932 hint_femp->count = 0; 933 } 934 935 static inline void exfat_set_empty_hint(struct exfat_inode_info *ei, 936 struct exfat_hint_femp *candi_empty, struct exfat_chain *clu, 937 int dentry, int num_entries, int entry_type) 938 { 939 if (ei->hint_femp.eidx == EXFAT_HINT_NONE || 940 ei->hint_femp.eidx > dentry) { 941 int total_entries = exfat_bytes_to_dentries(i_size_read(&ei->vfs_inode)); 942 943 if (candi_empty->count == 0) { 944 candi_empty->cur = *clu; 945 candi_empty->eidx = dentry; 946 } 947 948 if (entry_type == TYPE_UNUSED) 949 candi_empty->count += total_entries - dentry; 950 else 951 candi_empty->count++; 952 953 if (candi_empty->count == num_entries || 954 candi_empty->count + candi_empty->eidx == total_entries) 955 ei->hint_femp = *candi_empty; 956 } 957 } 958 959 enum { 960 DIRENT_STEP_FILE, 961 DIRENT_STEP_STRM, 962 DIRENT_STEP_NAME, 963 DIRENT_STEP_SECD, 964 }; 965 966 /* 967 * @ei: inode info of parent directory 968 * @p_dir: directory structure of parent directory 969 * @num_entries:entry size of p_uniname 970 * @hint_opt: If p_uniname is found, filled with optimized dir/entry 971 * for traversing cluster chain. 972 * @return: 973 * >= 0: file directory entry position where the name exists 974 * -ENOENT: entry with the name does not exist 975 * -EIO: I/O error 976 */ 977 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, 978 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 979 struct exfat_hint *hint_opt) 980 { 981 int i, rewind = 0, dentry = 0, end_eidx = 0, num_ext = 0, len; 982 int order, step, name_len = 0; 983 int dentries_per_clu; 984 unsigned int entry_type; 985 unsigned short *uniname = NULL; 986 struct exfat_chain clu; 987 struct exfat_hint *hint_stat = &ei->hint_stat; 988 struct exfat_hint_femp candi_empty; 989 struct exfat_sb_info *sbi = EXFAT_SB(sb); 990 int num_entries = exfat_calc_num_entries(p_uniname); 991 unsigned int clu_count = 0; 992 993 if (num_entries < 0) 994 return num_entries; 995 996 dentries_per_clu = sbi->dentries_per_clu; 997 998 exfat_chain_dup(&clu, p_dir); 999 1000 if (hint_stat->eidx) { 1001 clu.dir = hint_stat->clu; 1002 dentry = hint_stat->eidx; 1003 end_eidx = dentry; 1004 } 1005 1006 exfat_reset_empty_hint(&ei->hint_femp); 1007 1008 rewind: 1009 order = 0; 1010 step = DIRENT_STEP_FILE; 1011 exfat_reset_empty_hint(&candi_empty); 1012 1013 while (clu.dir != EXFAT_EOF_CLUSTER) { 1014 i = dentry & (dentries_per_clu - 1); 1015 for (; i < dentries_per_clu; i++, dentry++) { 1016 struct exfat_dentry *ep; 1017 struct buffer_head *bh; 1018 1019 if (rewind && dentry == end_eidx) 1020 goto not_found; 1021 1022 ep = exfat_get_dentry(sb, &clu, i, &bh); 1023 if (!ep) 1024 return -EIO; 1025 1026 entry_type = exfat_get_entry_type(ep); 1027 1028 if (entry_type == TYPE_UNUSED || 1029 entry_type == TYPE_DELETED) { 1030 step = DIRENT_STEP_FILE; 1031 1032 exfat_set_empty_hint(ei, &candi_empty, &clu, 1033 dentry, num_entries, 1034 entry_type); 1035 1036 brelse(bh); 1037 if (entry_type == TYPE_UNUSED) 1038 goto not_found; 1039 continue; 1040 } 1041 1042 exfat_reset_empty_hint(&candi_empty); 1043 1044 if (entry_type == TYPE_FILE || entry_type == TYPE_DIR) { 1045 step = DIRENT_STEP_FILE; 1046 hint_opt->clu = clu.dir; 1047 hint_opt->eidx = i; 1048 num_ext = ep->dentry.file.num_ext; 1049 step = DIRENT_STEP_STRM; 1050 brelse(bh); 1051 continue; 1052 } 1053 1054 if (entry_type == TYPE_STREAM) { 1055 u16 name_hash; 1056 1057 if (step != DIRENT_STEP_STRM) { 1058 step = DIRENT_STEP_FILE; 1059 brelse(bh); 1060 continue; 1061 } 1062 step = DIRENT_STEP_FILE; 1063 name_hash = le16_to_cpu( 1064 ep->dentry.stream.name_hash); 1065 if (p_uniname->name_hash == name_hash && 1066 p_uniname->name_len == 1067 ep->dentry.stream.name_len) { 1068 step = DIRENT_STEP_NAME; 1069 order = 1; 1070 name_len = 0; 1071 } 1072 brelse(bh); 1073 continue; 1074 } 1075 1076 if (entry_type == TYPE_EXTEND) { 1077 unsigned short entry_uniname[16], unichar; 1078 unsigned int offset; 1079 1080 if (step != DIRENT_STEP_NAME || 1081 name_len >= MAX_NAME_LENGTH) { 1082 brelse(bh); 1083 step = DIRENT_STEP_FILE; 1084 continue; 1085 } 1086 1087 offset = (++order - 2) * EXFAT_FILE_NAME_LEN; 1088 len = exfat_extract_uni_name(ep, entry_uniname); 1089 brelse(bh); 1090 if (offset > MAX_NAME_LENGTH || 1091 len > MAX_NAME_LENGTH - offset) { 1092 step = DIRENT_STEP_FILE; 1093 continue; 1094 } 1095 uniname = p_uniname->name + offset; 1096 name_len += len; 1097 1098 unichar = *(uniname+len); 1099 *(uniname+len) = 0x0; 1100 1101 if (exfat_uniname_ncmp(sb, uniname, 1102 entry_uniname, len)) { 1103 step = DIRENT_STEP_FILE; 1104 } else if (p_uniname->name_len == name_len) { 1105 if (order == num_ext) 1106 goto found; 1107 step = DIRENT_STEP_SECD; 1108 } 1109 1110 *(uniname+len) = unichar; 1111 continue; 1112 } 1113 1114 brelse(bh); 1115 if (entry_type & 1116 (TYPE_CRITICAL_SEC | TYPE_BENIGN_SEC)) { 1117 if (step == DIRENT_STEP_SECD) { 1118 if (++order == num_ext) 1119 goto found; 1120 continue; 1121 } 1122 } 1123 step = DIRENT_STEP_FILE; 1124 } 1125 1126 if (exfat_chain_advance(sb, &clu, 1)) 1127 return -EIO; 1128 1129 /* break if the cluster chain includes a loop */ 1130 if (unlikely(++clu_count > EXFAT_DATA_CLUSTER_COUNT(sbi))) 1131 goto not_found; 1132 } 1133 1134 not_found: 1135 /* 1136 * We started at not 0 index,so we should try to find target 1137 * from 0 index to the index we started at. 1138 */ 1139 if (!rewind && end_eidx) { 1140 rewind = 1; 1141 dentry = 0; 1142 clu.dir = p_dir->dir; 1143 goto rewind; 1144 } 1145 1146 /* 1147 * set the EXFAT_EOF_CLUSTER flag to avoid search 1148 * from the beginning again when allocated a new cluster 1149 */ 1150 if (ei->hint_femp.eidx == EXFAT_HINT_NONE) { 1151 ei->hint_femp.cur.dir = EXFAT_EOF_CLUSTER; 1152 ei->hint_femp.eidx = p_dir->size * dentries_per_clu; 1153 ei->hint_femp.count = 0; 1154 } 1155 1156 /* initialized hint_stat */ 1157 hint_stat->clu = p_dir->dir; 1158 hint_stat->eidx = 0; 1159 return -ENOENT; 1160 1161 found: 1162 /* next dentry we'll find is out of this cluster */ 1163 if (!((dentry + 1) & (dentries_per_clu - 1))) { 1164 int ret = 0; 1165 1166 ret = exfat_chain_advance(sb, &clu, 1); 1167 1168 if (ret || clu.dir == EXFAT_EOF_CLUSTER) { 1169 /* just initialized hint_stat */ 1170 hint_stat->clu = p_dir->dir; 1171 hint_stat->eidx = 0; 1172 return (dentry - num_ext); 1173 } 1174 } 1175 1176 hint_stat->clu = clu.dir; 1177 hint_stat->eidx = dentry + 1; 1178 return dentry - num_ext; 1179 } 1180 1181 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir) 1182 { 1183 int i, count = 0; 1184 int dentries_per_clu; 1185 unsigned int entry_type; 1186 unsigned int clu_count = 0; 1187 struct exfat_chain clu; 1188 struct exfat_dentry *ep; 1189 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1190 struct buffer_head *bh; 1191 1192 dentries_per_clu = sbi->dentries_per_clu; 1193 1194 exfat_chain_dup(&clu, p_dir); 1195 1196 while (clu.dir != EXFAT_EOF_CLUSTER) { 1197 for (i = 0; i < dentries_per_clu; i++) { 1198 ep = exfat_get_dentry(sb, &clu, i, &bh); 1199 if (!ep) 1200 return -EIO; 1201 entry_type = exfat_get_entry_type(ep); 1202 brelse(bh); 1203 1204 if (entry_type == TYPE_UNUSED) 1205 return count; 1206 if (entry_type != TYPE_DIR) 1207 continue; 1208 count++; 1209 } 1210 1211 if (exfat_chain_advance(sb, &clu, 1)) 1212 return -EIO; 1213 1214 if (unlikely(++clu_count > sbi->used_clusters)) { 1215 exfat_fs_error(sb, "FAT or bitmap is corrupted"); 1216 return -EIO; 1217 } 1218 } 1219 1220 return count; 1221 } 1222 1223 static int exfat_get_volume_label_dentry(struct super_block *sb, 1224 struct exfat_entry_set_cache *es) 1225 { 1226 int i; 1227 int dentry = 0; 1228 unsigned int type; 1229 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1230 struct exfat_hint_femp hint_femp; 1231 struct exfat_inode_info *ei = EXFAT_I(sb->s_root->d_inode); 1232 struct exfat_chain clu; 1233 struct exfat_dentry *ep; 1234 struct buffer_head *bh; 1235 1236 hint_femp.eidx = EXFAT_HINT_NONE; 1237 exfat_chain_set(&clu, sbi->root_dir, 0, ALLOC_FAT_CHAIN); 1238 1239 while (clu.dir != EXFAT_EOF_CLUSTER) { 1240 for (i = 0; i < sbi->dentries_per_clu; i++, dentry++) { 1241 ep = exfat_get_dentry(sb, &clu, i, &bh); 1242 if (!ep) 1243 return -EIO; 1244 1245 type = exfat_get_entry_type(ep); 1246 if (hint_femp.eidx == EXFAT_HINT_NONE) { 1247 if (type == TYPE_DELETED || type == TYPE_UNUSED) { 1248 hint_femp.cur = clu; 1249 hint_femp.eidx = dentry; 1250 hint_femp.count = 1; 1251 } 1252 } 1253 1254 if (type == TYPE_UNUSED) { 1255 brelse(bh); 1256 goto not_found; 1257 } 1258 1259 if (type != TYPE_VOLUME) { 1260 brelse(bh); 1261 continue; 1262 } 1263 1264 memset(es, 0, sizeof(*es)); 1265 es->sb = sb; 1266 es->bh = es->__bh; 1267 es->bh[0] = bh; 1268 es->num_bh = 1; 1269 es->start_off = exfat_dentries_to_bytes(i) % sb->s_blocksize; 1270 1271 return 0; 1272 } 1273 1274 if (exfat_get_next_cluster(sb, &(clu.dir))) 1275 return -EIO; 1276 } 1277 1278 not_found: 1279 if (hint_femp.eidx == EXFAT_HINT_NONE) { 1280 hint_femp.cur.dir = EXFAT_EOF_CLUSTER; 1281 hint_femp.eidx = dentry; 1282 hint_femp.count = 0; 1283 } 1284 1285 ei->hint_femp = hint_femp; 1286 1287 return -ENOENT; 1288 } 1289 1290 int exfat_read_volume_label(struct super_block *sb, struct exfat_uni_name *label_out) 1291 { 1292 int ret, i; 1293 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1294 struct exfat_entry_set_cache es; 1295 struct exfat_dentry *ep; 1296 1297 mutex_lock(&sbi->s_lock); 1298 1299 memset(label_out, 0, sizeof(*label_out)); 1300 ret = exfat_get_volume_label_dentry(sb, &es); 1301 if (ret < 0) { 1302 /* 1303 * ENOENT signifies that a volume label dentry doesn't exist 1304 * We will treat this as an empty volume label and not fail. 1305 */ 1306 if (ret == -ENOENT) 1307 ret = 0; 1308 1309 goto unlock; 1310 } 1311 1312 ep = exfat_get_dentry_cached(&es, 0); 1313 label_out->name_len = ep->dentry.volume_label.char_count; 1314 if (label_out->name_len > EXFAT_VOLUME_LABEL_LEN) { 1315 ret = -EIO; 1316 exfat_put_dentry_set(&es, false); 1317 goto unlock; 1318 } 1319 1320 for (i = 0; i < label_out->name_len; i++) 1321 label_out->name[i] = le16_to_cpu(ep->dentry.volume_label.volume_label[i]); 1322 1323 exfat_put_dentry_set(&es, false); 1324 unlock: 1325 mutex_unlock(&sbi->s_lock); 1326 return ret; 1327 } 1328 1329 int exfat_write_volume_label(struct super_block *sb, 1330 struct exfat_uni_name *label) 1331 { 1332 int ret, i; 1333 struct exfat_sb_info *sbi = EXFAT_SB(sb); 1334 struct inode *root_inode = sb->s_root->d_inode; 1335 struct exfat_entry_set_cache es; 1336 struct exfat_chain clu; 1337 struct exfat_dentry *ep; 1338 1339 if (label->name_len > EXFAT_VOLUME_LABEL_LEN) 1340 return -EINVAL; 1341 1342 mutex_lock(&sbi->s_lock); 1343 1344 ret = exfat_get_volume_label_dentry(sb, &es); 1345 if (ret == -ENOENT) { 1346 if (label->name_len == 0) { 1347 /* No volume label dentry, no need to clear */ 1348 ret = 0; 1349 goto unlock; 1350 } 1351 1352 ret = exfat_find_empty_entry(root_inode, &clu, 1, &es); 1353 } 1354 1355 if (ret < 0) 1356 goto unlock; 1357 1358 ep = exfat_get_dentry_cached(&es, 0); 1359 1360 if (label->name_len == 0 && ep->dentry.volume_label.char_count == 0) { 1361 /* volume label had been cleared */ 1362 exfat_put_dentry_set(&es, 0); 1363 goto unlock; 1364 } 1365 1366 memset(ep, 0, sizeof(*ep)); 1367 ep->type = EXFAT_VOLUME; 1368 1369 for (i = 0; i < label->name_len; i++) 1370 ep->dentry.volume_label.volume_label[i] = 1371 cpu_to_le16(label->name[i]); 1372 1373 ep->dentry.volume_label.char_count = label->name_len; 1374 es.modified = true; 1375 1376 ret = exfat_put_dentry_set(&es, IS_DIRSYNC(root_inode)); 1377 1378 unlock: 1379 mutex_unlock(&sbi->s_lock); 1380 return ret; 1381 } 1382