1/* 2 * linux/fs/fat/dir.c 3 * 4 * directory handling functions for fat-based filesystems 5 * 6 * Written 1992,1993 by Werner Almesberger 7 * 8 * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu> 9 * 10 * VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu> 11 * Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk> 12 * Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV 13 * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de> 14 */ 15 16#include <linux/slab.h> 17#include <linux/compat.h> 18#include <linux/uaccess.h> 19#include "fat.h" 20 21/* 22 * Maximum buffer size of short name. 23 * [(MSDOS_NAME + '.') * max one char + nul] 24 * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] 25 */ 26#define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) 27/* 28 * Maximum buffer size of unicode chars from slots. 29 * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] 30 */ 31#define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) 32#define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) 33 34static inline unsigned char fat_tolower(unsigned char c) 35{ 36 return ((c >= 'A') && (c <= 'Z')) ? c+32 : c; 37} 38 39static inline loff_t fat_make_i_pos(struct super_block *sb, 40 struct buffer_head *bh, 41 struct msdos_dir_entry *de) 42{ 43 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) 44 | (de - (struct msdos_dir_entry *)bh->b_data); 45} 46 47static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, 48 sector_t phys) 49{ 50 struct super_block *sb = dir->i_sb; 51 struct msdos_sb_info *sbi = MSDOS_SB(sb); 52 struct buffer_head *bh; 53 int sec; 54 55 /* This is not a first sector of cluster, or sec_per_clus == 1 */ 56 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) 57 return; 58 /* root dir of FAT12/FAT16 */ 59 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) 60 return; 61 62 bh = sb_find_get_block(sb, phys); 63 if (bh == NULL || !buffer_uptodate(bh)) { 64 for (sec = 0; sec < sbi->sec_per_clus; sec++) 65 sb_breadahead(sb, phys + sec); 66 } 67 brelse(bh); 68} 69 70/* Returns the inode number of the directory entry at offset pos. If bh is 71 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is 72 returned in bh. 73 AV. Most often we do it item-by-item. Makes sense to optimize. 74 AV. OK, there we go: if both bh and de are non-NULL we assume that we just 75 AV. want the next entry (took one explicit de=NULL in vfat/namei.c). 76 AV. It's done in fat_get_entry() (inlined), here the slow case lives. 77 AV. Additionally, when we return -1 (i.e. reached the end of directory) 78 AV. we make bh NULL. 79 */ 80static int fat__get_entry(struct inode *dir, loff_t *pos, 81 struct buffer_head **bh, struct msdos_dir_entry **de) 82{ 83 struct super_block *sb = dir->i_sb; 84 sector_t phys, iblock; 85 unsigned long mapped_blocks; 86 int err, offset; 87 88next: 89 if (*bh) 90 brelse(*bh); 91 92 *bh = NULL; 93 iblock = *pos >> sb->s_blocksize_bits; 94 err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0); 95 if (err || !phys) 96 return -1; /* beyond EOF or error */ 97 98 fat_dir_readahead(dir, iblock, phys); 99 100 *bh = sb_bread(sb, phys); 101 if (*bh == NULL) { 102 fat_msg_ratelimit(sb, KERN_ERR, 103 "Directory bread(block %llu) failed", (llu)phys); 104 /* skip this block */ 105 *pos = (iblock + 1) << sb->s_blocksize_bits; 106 goto next; 107 } 108 109 offset = *pos & (sb->s_blocksize - 1); 110 *pos += sizeof(struct msdos_dir_entry); 111 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 112 113 return 0; 114} 115 116static inline int fat_get_entry(struct inode *dir, loff_t *pos, 117 struct buffer_head **bh, 118 struct msdos_dir_entry **de) 119{ 120 /* Fast stuff first */ 121 if (*bh && *de && 122 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < 123 MSDOS_SB(dir->i_sb)->dir_per_block - 1) { 124 *pos += sizeof(struct msdos_dir_entry); 125 (*de)++; 126 return 0; 127 } 128 return fat__get_entry(dir, pos, bh, de); 129} 130 131/* 132 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. 133 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a 134 * colon as an escape character since it is normally invalid on the vfat 135 * filesystem. The following four characters are the hexadecimal digits 136 * of Unicode value. This lets us do a full dump and restore of Unicode 137 * filenames. We could get into some trouble with long Unicode names, 138 * but ignore that right now. 139 * Ahem... Stack smashing in ring 0 isn't fun. Fixed. 140 */ 141static int uni16_to_x8(struct super_block *sb, unsigned char *ascii, 142 const wchar_t *uni, int len, struct nls_table *nls) 143{ 144 int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate; 145 const wchar_t *ip; 146 wchar_t ec; 147 unsigned char *op; 148 int charlen; 149 150 ip = uni; 151 op = ascii; 152 153 while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { 154 ec = *ip++; 155 charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE); 156 if (charlen > 0) { 157 op += charlen; 158 len -= charlen; 159 } else { 160 if (uni_xlate == 1) { 161 *op++ = ':'; 162 op = hex_byte_pack(op, ec >> 8); 163 op = hex_byte_pack(op, ec); 164 len -= 5; 165 } else { 166 *op++ = '?'; 167 len--; 168 } 169 } 170 } 171 172 if (unlikely(*ip)) { 173 fat_msg(sb, KERN_WARNING, 174 "filename was truncated while converting."); 175 } 176 177 *op = 0; 178 return op - ascii; 179} 180 181static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni, 182 unsigned char *buf, int size) 183{ 184 struct msdos_sb_info *sbi = MSDOS_SB(sb); 185 if (sbi->options.utf8) 186 return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS, 187 UTF16_HOST_ENDIAN, buf, size); 188 else 189 return uni16_to_x8(sb, buf, uni, size, sbi->nls_io); 190} 191 192static inline int 193fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 194{ 195 int charlen; 196 197 charlen = t->char2uni(c, clen, uni); 198 if (charlen < 0) { 199 *uni = 0x003f; /* a question mark */ 200 charlen = 1; 201 } 202 return charlen; 203} 204 205static inline int 206fat_short2lower_uni(struct nls_table *t, unsigned char *c, 207 int clen, wchar_t *uni) 208{ 209 int charlen; 210 wchar_t wc; 211 212 charlen = t->char2uni(c, clen, &wc); 213 if (charlen < 0) { 214 *uni = 0x003f; /* a question mark */ 215 charlen = 1; 216 } else if (charlen <= 1) { 217 unsigned char nc = t->charset2lower[*c]; 218 219 if (!nc) 220 nc = *c; 221 222 charlen = t->char2uni(&nc, 1, uni); 223 if (charlen < 0) { 224 *uni = 0x003f; /* a question mark */ 225 charlen = 1; 226 } 227 } else 228 *uni = wc; 229 230 return charlen; 231} 232 233static inline int 234fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, 235 wchar_t *uni_buf, unsigned short opt, int lower) 236{ 237 int len = 0; 238 239 if (opt & VFAT_SFN_DISPLAY_LOWER) 240 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 241 else if (opt & VFAT_SFN_DISPLAY_WIN95) 242 len = fat_short2uni(nls, buf, buf_size, uni_buf); 243 else if (opt & VFAT_SFN_DISPLAY_WINNT) { 244 if (lower) 245 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 246 else 247 len = fat_short2uni(nls, buf, buf_size, uni_buf); 248 } else 249 len = fat_short2uni(nls, buf, buf_size, uni_buf); 250 251 return len; 252} 253 254static inline int fat_name_match(struct msdos_sb_info *sbi, 255 const unsigned char *a, int a_len, 256 const unsigned char *b, int b_len) 257{ 258 if (a_len != b_len) 259 return 0; 260 261 if (sbi->options.name_check != 's') 262 return !nls_strnicmp(sbi->nls_io, a, b, a_len); 263 else 264 return !memcmp(a, b, a_len); 265} 266 267enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; 268 269/** 270 * fat_parse_long - Parse extended directory entry. 271 * 272 * This function returns zero on success, negative value on error, or one of 273 * the following: 274 * 275 * %PARSE_INVALID - Directory entry is invalid. 276 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. 277 * %PARSE_EOF - Directory has no more entries. 278 */ 279static int fat_parse_long(struct inode *dir, loff_t *pos, 280 struct buffer_head **bh, struct msdos_dir_entry **de, 281 wchar_t **unicode, unsigned char *nr_slots) 282{ 283 struct msdos_dir_slot *ds; 284 unsigned char id, slot, slots, alias_checksum; 285 286 if (!*unicode) { 287 *unicode = __getname(); 288 if (!*unicode) { 289 brelse(*bh); 290 return -ENOMEM; 291 } 292 } 293parse_long: 294 slots = 0; 295 ds = (struct msdos_dir_slot *)*de; 296 id = ds->id; 297 if (!(id & 0x40)) 298 return PARSE_INVALID; 299 slots = id & ~0x40; 300 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ 301 return PARSE_INVALID; 302 *nr_slots = slots; 303 alias_checksum = ds->alias_checksum; 304 305 slot = slots; 306 while (1) { 307 int offset; 308 309 slot--; 310 offset = slot * 13; 311 fat16_towchar(*unicode + offset, ds->name0_4, 5); 312 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); 313 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); 314 315 if (ds->id & 0x40) 316 (*unicode)[offset + 13] = 0; 317 if (fat_get_entry(dir, pos, bh, de) < 0) 318 return PARSE_EOF; 319 if (slot == 0) 320 break; 321 ds = (struct msdos_dir_slot *)*de; 322 if (ds->attr != ATTR_EXT) 323 return PARSE_NOT_LONGNAME; 324 if ((ds->id & ~0x40) != slot) 325 goto parse_long; 326 if (ds->alias_checksum != alias_checksum) 327 goto parse_long; 328 } 329 if ((*de)->name[0] == DELETED_FLAG) 330 return PARSE_INVALID; 331 if ((*de)->attr == ATTR_EXT) 332 goto parse_long; 333 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) 334 return PARSE_INVALID; 335 if (fat_checksum((*de)->name) != alias_checksum) 336 *nr_slots = 0; 337 338 return 0; 339} 340 341/** 342 * fat_parse_short - Parse MS-DOS (short) directory entry. 343 * @sb: superblock 344 * @de: directory entry to parse 345 * @name: FAT_MAX_SHORT_SIZE array in which to place extracted name 346 * @dot_hidden: Nonzero == prepend '.' to names with ATTR_HIDDEN 347 * 348 * Returns the number of characters extracted into 'name'. 349 */ 350static int fat_parse_short(struct super_block *sb, 351 const struct msdos_dir_entry *de, 352 unsigned char *name, int dot_hidden) 353{ 354 const struct msdos_sb_info *sbi = MSDOS_SB(sb); 355 int isvfat = sbi->options.isvfat; 356 int nocase = sbi->options.nocase; 357 unsigned short opt_shortname = sbi->options.shortname; 358 struct nls_table *nls_disk = sbi->nls_disk; 359 wchar_t uni_name[14]; 360 unsigned char c, work[MSDOS_NAME]; 361 unsigned char *ptname = name; 362 int chi, chl, i, j, k; 363 int dotoffset = 0; 364 int name_len = 0, uni_len = 0; 365 366 if (!isvfat && dot_hidden && (de->attr & ATTR_HIDDEN)) { 367 *ptname++ = '.'; 368 dotoffset = 1; 369 } 370 371 memcpy(work, de->name, sizeof(work)); 372 /* see namei.c, msdos_format_name */ 373 if (work[0] == 0x05) 374 work[0] = 0xE5; 375 376 /* Filename */ 377 for (i = 0, j = 0; i < 8;) { 378 c = work[i]; 379 if (!c) 380 break; 381 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 382 &uni_name[j++], opt_shortname, 383 de->lcase & CASE_LOWER_BASE); 384 if (chl <= 1) { 385 if (!isvfat) 386 ptname[i] = nocase ? c : fat_tolower(c); 387 i++; 388 if (c != ' ') { 389 name_len = i; 390 uni_len = j; 391 } 392 } else { 393 uni_len = j; 394 if (isvfat) 395 i += min(chl, 8-i); 396 else { 397 for (chi = 0; chi < chl && i < 8; chi++, i++) 398 ptname[i] = work[i]; 399 } 400 if (chl) 401 name_len = i; 402 } 403 } 404 405 i = name_len; 406 j = uni_len; 407 fat_short2uni(nls_disk, ".", 1, &uni_name[j++]); 408 if (!isvfat) 409 ptname[i] = '.'; 410 i++; 411 412 /* Extension */ 413 for (k = 8; k < MSDOS_NAME;) { 414 c = work[k]; 415 if (!c) 416 break; 417 chl = fat_shortname2uni(nls_disk, &work[k], MSDOS_NAME - k, 418 &uni_name[j++], opt_shortname, 419 de->lcase & CASE_LOWER_EXT); 420 if (chl <= 1) { 421 k++; 422 if (!isvfat) 423 ptname[i] = nocase ? c : fat_tolower(c); 424 i++; 425 if (c != ' ') { 426 name_len = i; 427 uni_len = j; 428 } 429 } else { 430 uni_len = j; 431 if (isvfat) { 432 int offset = min(chl, MSDOS_NAME-k); 433 k += offset; 434 i += offset; 435 } else { 436 for (chi = 0; chi < chl && k < MSDOS_NAME; 437 chi++, i++, k++) { 438 ptname[i] = work[k]; 439 } 440 } 441 if (chl) 442 name_len = i; 443 } 444 } 445 446 if (name_len > 0) { 447 name_len += dotoffset; 448 449 if (sbi->options.isvfat) { 450 uni_name[uni_len] = 0x0000; 451 name_len = fat_uni_to_x8(sb, uni_name, name, 452 FAT_MAX_SHORT_SIZE); 453 } 454 } 455 456 return name_len; 457} 458 459/* 460 * Return values: negative -> error/not found, 0 -> found. 461 */ 462int fat_search_long(struct inode *inode, const unsigned char *name, 463 int name_len, struct fat_slot_info *sinfo) 464{ 465 struct super_block *sb = inode->i_sb; 466 struct msdos_sb_info *sbi = MSDOS_SB(sb); 467 struct buffer_head *bh = NULL; 468 struct msdos_dir_entry *de; 469 unsigned char nr_slots; 470 wchar_t *unicode = NULL; 471 unsigned char bufname[FAT_MAX_SHORT_SIZE]; 472 loff_t cpos = 0; 473 int err, len; 474 475 err = -ENOENT; 476 while (1) { 477 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 478 goto end_of_dir; 479parse_record: 480 nr_slots = 0; 481 if (de->name[0] == DELETED_FLAG) 482 continue; 483 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 484 continue; 485 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 486 continue; 487 if (de->attr == ATTR_EXT) { 488 int status = fat_parse_long(inode, &cpos, &bh, &de, 489 &unicode, &nr_slots); 490 if (status < 0) { 491 err = status; 492 goto end_of_dir; 493 } else if (status == PARSE_INVALID) 494 continue; 495 else if (status == PARSE_NOT_LONGNAME) 496 goto parse_record; 497 else if (status == PARSE_EOF) 498 goto end_of_dir; 499 } 500 501 /* Never prepend '.' to hidden files here. 502 * That is done only for msdos mounts (and only when 503 * 'dotsOK=yes'); if we are executing here, it is in the 504 * context of a vfat mount. 505 */ 506 len = fat_parse_short(sb, de, bufname, 0); 507 if (len == 0) 508 continue; 509 510 /* Compare shortname */ 511 if (fat_name_match(sbi, name, name_len, bufname, len)) 512 goto found; 513 514 if (nr_slots) { 515 void *longname = unicode + FAT_MAX_UNI_CHARS; 516 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 517 518 /* Compare longname */ 519 len = fat_uni_to_x8(sb, unicode, longname, size); 520 if (fat_name_match(sbi, name, name_len, longname, len)) 521 goto found; 522 } 523 } 524 525found: 526 nr_slots++; /* include the de */ 527 sinfo->slot_off = cpos - nr_slots * sizeof(*de); 528 sinfo->nr_slots = nr_slots; 529 sinfo->de = de; 530 sinfo->bh = bh; 531 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 532 err = 0; 533end_of_dir: 534 if (unicode) 535 __putname(unicode); 536 537 return err; 538} 539EXPORT_SYMBOL_GPL(fat_search_long); 540 541struct fat_ioctl_filldir_callback { 542 struct dir_context ctx; 543 void __user *dirent; 544 int result; 545 /* for dir ioctl */ 546 const char *longname; 547 int long_len; 548 const char *shortname; 549 int short_len; 550}; 551 552static int __fat_readdir(struct inode *inode, struct file *file, 553 struct dir_context *ctx, int short_only, 554 struct fat_ioctl_filldir_callback *both) 555{ 556 struct super_block *sb = inode->i_sb; 557 struct msdos_sb_info *sbi = MSDOS_SB(sb); 558 struct buffer_head *bh; 559 struct msdos_dir_entry *de; 560 unsigned char nr_slots; 561 wchar_t *unicode = NULL; 562 unsigned char bufname[FAT_MAX_SHORT_SIZE]; 563 int isvfat = sbi->options.isvfat; 564 const char *fill_name = NULL; 565 int fake_offset = 0; 566 loff_t cpos; 567 int short_len = 0, fill_len = 0; 568 int ret = 0; 569 570 mutex_lock(&sbi->s_lock); 571 572 cpos = ctx->pos; 573 /* Fake . and .. for the root directory. */ 574 if (inode->i_ino == MSDOS_ROOT_INO) { 575 if (!dir_emit_dots(file, ctx)) 576 goto out; 577 if (ctx->pos == 2) { 578 fake_offset = 1; 579 cpos = 0; 580 } 581 } 582 if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { 583 ret = -ENOENT; 584 goto out; 585 } 586 587 bh = NULL; 588get_new: 589 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 590 goto end_of_dir; 591parse_record: 592 nr_slots = 0; 593 /* 594 * Check for long filename entry, but if short_only, we don't 595 * need to parse long filename. 596 */ 597 if (isvfat && !short_only) { 598 if (de->name[0] == DELETED_FLAG) 599 goto record_end; 600 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 601 goto record_end; 602 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 603 goto record_end; 604 } else { 605 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) 606 goto record_end; 607 } 608 609 if (isvfat && de->attr == ATTR_EXT) { 610 int status = fat_parse_long(inode, &cpos, &bh, &de, 611 &unicode, &nr_slots); 612 if (status < 0) { 613 ctx->pos = cpos; 614 ret = status; 615 goto out; 616 } else if (status == PARSE_INVALID) 617 goto record_end; 618 else if (status == PARSE_NOT_LONGNAME) 619 goto parse_record; 620 else if (status == PARSE_EOF) 621 goto end_of_dir; 622 623 if (nr_slots) { 624 void *longname = unicode + FAT_MAX_UNI_CHARS; 625 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 626 int len = fat_uni_to_x8(sb, unicode, longname, size); 627 628 fill_name = longname; 629 fill_len = len; 630 /* !both && !short_only, so we don't need shortname. */ 631 if (!both) 632 goto start_filldir; 633 634 short_len = fat_parse_short(sb, de, bufname, 635 sbi->options.dotsOK); 636 if (short_len == 0) 637 goto record_end; 638 /* hack for fat_ioctl_filldir() */ 639 both->longname = fill_name; 640 both->long_len = fill_len; 641 both->shortname = bufname; 642 both->short_len = short_len; 643 fill_name = NULL; 644 fill_len = 0; 645 goto start_filldir; 646 } 647 } 648 649 short_len = fat_parse_short(sb, de, bufname, sbi->options.dotsOK); 650 if (short_len == 0) 651 goto record_end; 652 653 fill_name = bufname; 654 fill_len = short_len; 655 656start_filldir: 657 if (!fake_offset) 658 ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); 659 660 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) { 661 if (!dir_emit_dot(file, ctx)) 662 goto fill_failed; 663 } else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 664 if (!dir_emit_dotdot(file, ctx)) 665 goto fill_failed; 666 } else { 667 unsigned long inum; 668 loff_t i_pos = fat_make_i_pos(sb, bh, de); 669 struct inode *tmp = fat_iget(sb, i_pos); 670 if (tmp) { 671 inum = tmp->i_ino; 672 iput(tmp); 673 } else 674 inum = iunique(sb, MSDOS_ROOT_INO); 675 if (!dir_emit(ctx, fill_name, fill_len, inum, 676 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG)) 677 goto fill_failed; 678 } 679 680record_end: 681 fake_offset = 0; 682 ctx->pos = cpos; 683 goto get_new; 684end_of_dir: 685 ctx->pos = cpos; 686fill_failed: 687 brelse(bh); 688 if (unicode) 689 __putname(unicode); 690out: 691 mutex_unlock(&sbi->s_lock); 692 return ret; 693} 694 695static int fat_readdir(struct file *file, struct dir_context *ctx) 696{ 697 return __fat_readdir(file_inode(file), file, ctx, 0, NULL); 698} 699 700#define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ 701static int func(struct dir_context *ctx, const char *name, int name_len, \ 702 loff_t offset, u64 ino, unsigned int d_type) \ 703{ \ 704 struct fat_ioctl_filldir_callback *buf = \ 705 container_of(ctx, struct fat_ioctl_filldir_callback, ctx); \ 706 struct dirent_type __user *d1 = buf->dirent; \ 707 struct dirent_type __user *d2 = d1 + 1; \ 708 \ 709 if (buf->result) \ 710 return -EINVAL; \ 711 buf->result++; \ 712 \ 713 if (name != NULL) { \ 714 /* dirent has only short name */ \ 715 if (name_len >= sizeof(d1->d_name)) \ 716 name_len = sizeof(d1->d_name) - 1; \ 717 \ 718 if (put_user(0, d2->d_name) || \ 719 put_user(0, &d2->d_reclen) || \ 720 copy_to_user(d1->d_name, name, name_len) || \ 721 put_user(0, d1->d_name + name_len) || \ 722 put_user(name_len, &d1->d_reclen)) \ 723 goto efault; \ 724 } else { \ 725 /* dirent has short and long name */ \ 726 const char *longname = buf->longname; \ 727 int long_len = buf->long_len; \ 728 const char *shortname = buf->shortname; \ 729 int short_len = buf->short_len; \ 730 \ 731 if (long_len >= sizeof(d1->d_name)) \ 732 long_len = sizeof(d1->d_name) - 1; \ 733 if (short_len >= sizeof(d1->d_name)) \ 734 short_len = sizeof(d1->d_name) - 1; \ 735 \ 736 if (copy_to_user(d2->d_name, longname, long_len) || \ 737 put_user(0, d2->d_name + long_len) || \ 738 put_user(long_len, &d2->d_reclen) || \ 739 put_user(ino, &d2->d_ino) || \ 740 put_user(offset, &d2->d_off) || \ 741 copy_to_user(d1->d_name, shortname, short_len) || \ 742 put_user(0, d1->d_name + short_len) || \ 743 put_user(short_len, &d1->d_reclen)) \ 744 goto efault; \ 745 } \ 746 return 0; \ 747efault: \ 748 buf->result = -EFAULT; \ 749 return -EFAULT; \ 750} 751 752FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) 753 754static int fat_ioctl_readdir(struct inode *inode, struct file *file, 755 void __user *dirent, filldir_t filldir, 756 int short_only, int both) 757{ 758 struct fat_ioctl_filldir_callback buf = { 759 .ctx.actor = filldir, 760 .dirent = dirent 761 }; 762 int ret; 763 764 buf.dirent = dirent; 765 buf.result = 0; 766 mutex_lock(&inode->i_mutex); 767 buf.ctx.pos = file->f_pos; 768 ret = -ENOENT; 769 if (!IS_DEADDIR(inode)) { 770 ret = __fat_readdir(inode, file, &buf.ctx, 771 short_only, both ? &buf : NULL); 772 file->f_pos = buf.ctx.pos; 773 } 774 mutex_unlock(&inode->i_mutex); 775 if (ret >= 0) 776 ret = buf.result; 777 return ret; 778} 779 780static long fat_dir_ioctl(struct file *filp, unsigned int cmd, 781 unsigned long arg) 782{ 783 struct inode *inode = file_inode(filp); 784 struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; 785 int short_only, both; 786 787 switch (cmd) { 788 case VFAT_IOCTL_READDIR_SHORT: 789 short_only = 1; 790 both = 0; 791 break; 792 case VFAT_IOCTL_READDIR_BOTH: 793 short_only = 0; 794 both = 1; 795 break; 796 default: 797 return fat_generic_ioctl(filp, cmd, arg); 798 } 799 800 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2]))) 801 return -EFAULT; 802 /* 803 * Yes, we don't need this put_user() absolutely. However old 804 * code didn't return the right value. So, app use this value, 805 * in order to check whether it is EOF. 806 */ 807 if (put_user(0, &d1->d_reclen)) 808 return -EFAULT; 809 810 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, 811 short_only, both); 812} 813 814#ifdef CONFIG_COMPAT 815#define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) 816#define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) 817 818FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) 819 820static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, 821 unsigned long arg) 822{ 823 struct inode *inode = file_inode(filp); 824 struct compat_dirent __user *d1 = compat_ptr(arg); 825 int short_only, both; 826 827 switch (cmd) { 828 case VFAT_IOCTL_READDIR_SHORT32: 829 short_only = 1; 830 both = 0; 831 break; 832 case VFAT_IOCTL_READDIR_BOTH32: 833 short_only = 0; 834 both = 1; 835 break; 836 default: 837 return fat_generic_ioctl(filp, cmd, (unsigned long)arg); 838 } 839 840 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) 841 return -EFAULT; 842 /* 843 * Yes, we don't need this put_user() absolutely. However old 844 * code didn't return the right value. So, app use this value, 845 * in order to check whether it is EOF. 846 */ 847 if (put_user(0, &d1->d_reclen)) 848 return -EFAULT; 849 850 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, 851 short_only, both); 852} 853#endif /* CONFIG_COMPAT */ 854 855const struct file_operations fat_dir_operations = { 856 .llseek = generic_file_llseek, 857 .read = generic_read_dir, 858 .iterate = fat_readdir, 859 .unlocked_ioctl = fat_dir_ioctl, 860#ifdef CONFIG_COMPAT 861 .compat_ioctl = fat_compat_dir_ioctl, 862#endif 863 .fsync = fat_file_fsync, 864}; 865 866static int fat_get_short_entry(struct inode *dir, loff_t *pos, 867 struct buffer_head **bh, 868 struct msdos_dir_entry **de) 869{ 870 while (fat_get_entry(dir, pos, bh, de) >= 0) { 871 /* free entry or long name entry or volume label */ 872 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) 873 return 0; 874 } 875 return -ENOENT; 876} 877 878/* 879 * The ".." entry can not provide the "struct fat_slot_info" information 880 * for inode, nor a usable i_pos. So, this function provides some information 881 * only. 882 * 883 * Since this function walks through the on-disk inodes within a directory, 884 * callers are responsible for taking any locks necessary to prevent the 885 * directory from changing. 886 */ 887int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, 888 struct msdos_dir_entry **de) 889{ 890 loff_t offset = 0; 891 892 *de = NULL; 893 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { 894 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) 895 return 0; 896 } 897 return -ENOENT; 898} 899EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); 900 901/* See if directory is empty */ 902int fat_dir_empty(struct inode *dir) 903{ 904 struct buffer_head *bh; 905 struct msdos_dir_entry *de; 906 loff_t cpos; 907 int result = 0; 908 909 bh = NULL; 910 cpos = 0; 911 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 912 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && 913 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 914 result = -ENOTEMPTY; 915 break; 916 } 917 } 918 brelse(bh); 919 return result; 920} 921EXPORT_SYMBOL_GPL(fat_dir_empty); 922 923/* 924 * fat_subdirs counts the number of sub-directories of dir. It can be run 925 * on directories being created. 926 */ 927int fat_subdirs(struct inode *dir) 928{ 929 struct buffer_head *bh; 930 struct msdos_dir_entry *de; 931 loff_t cpos; 932 int count = 0; 933 934 bh = NULL; 935 cpos = 0; 936 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 937 if (de->attr & ATTR_DIR) 938 count++; 939 } 940 brelse(bh); 941 return count; 942} 943 944/* 945 * Scans a directory for a given file (name points to its formatted name). 946 * Returns an error code or zero. 947 */ 948int fat_scan(struct inode *dir, const unsigned char *name, 949 struct fat_slot_info *sinfo) 950{ 951 struct super_block *sb = dir->i_sb; 952 953 sinfo->slot_off = 0; 954 sinfo->bh = NULL; 955 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 956 &sinfo->de) >= 0) { 957 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { 958 sinfo->slot_off -= sizeof(*sinfo->de); 959 sinfo->nr_slots = 1; 960 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 961 return 0; 962 } 963 } 964 return -ENOENT; 965} 966EXPORT_SYMBOL_GPL(fat_scan); 967 968/* 969 * Scans a directory for a given logstart. 970 * Returns an error code or zero. 971 */ 972int fat_scan_logstart(struct inode *dir, int i_logstart, 973 struct fat_slot_info *sinfo) 974{ 975 struct super_block *sb = dir->i_sb; 976 977 sinfo->slot_off = 0; 978 sinfo->bh = NULL; 979 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 980 &sinfo->de) >= 0) { 981 if (fat_get_start(MSDOS_SB(sb), sinfo->de) == i_logstart) { 982 sinfo->slot_off -= sizeof(*sinfo->de); 983 sinfo->nr_slots = 1; 984 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 985 return 0; 986 } 987 } 988 return -ENOENT; 989} 990 991static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) 992{ 993 struct super_block *sb = dir->i_sb; 994 struct buffer_head *bh; 995 struct msdos_dir_entry *de, *endp; 996 int err = 0, orig_slots; 997 998 while (nr_slots) { 999 bh = NULL; 1000 if (fat_get_entry(dir, &pos, &bh, &de) < 0) { 1001 err = -EIO; 1002 break; 1003 } 1004 1005 orig_slots = nr_slots; 1006 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); 1007 while (nr_slots && de < endp) { 1008 de->name[0] = DELETED_FLAG; 1009 de++; 1010 nr_slots--; 1011 } 1012 mark_buffer_dirty_inode(bh, dir); 1013 if (IS_DIRSYNC(dir)) 1014 err = sync_dirty_buffer(bh); 1015 brelse(bh); 1016 if (err) 1017 break; 1018 1019 /* pos is *next* de's position, so this does `- sizeof(de)' */ 1020 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); 1021 } 1022 1023 return err; 1024} 1025 1026int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) 1027{ 1028 struct super_block *sb = dir->i_sb; 1029 struct msdos_dir_entry *de; 1030 struct buffer_head *bh; 1031 int err = 0, nr_slots; 1032 1033 /* 1034 * First stage: Remove the shortname. By this, the directory 1035 * entry is removed. 1036 */ 1037 nr_slots = sinfo->nr_slots; 1038 de = sinfo->de; 1039 sinfo->de = NULL; 1040 bh = sinfo->bh; 1041 sinfo->bh = NULL; 1042 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { 1043 de->name[0] = DELETED_FLAG; 1044 de--; 1045 nr_slots--; 1046 } 1047 mark_buffer_dirty_inode(bh, dir); 1048 if (IS_DIRSYNC(dir)) 1049 err = sync_dirty_buffer(bh); 1050 brelse(bh); 1051 if (err) 1052 return err; 1053 dir->i_version++; 1054 1055 if (nr_slots) { 1056 /* 1057 * Second stage: remove the remaining longname slots. 1058 * (This directory entry is already removed, and so return 1059 * the success) 1060 */ 1061 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); 1062 if (err) { 1063 fat_msg(sb, KERN_WARNING, 1064 "Couldn't remove the long name slots"); 1065 } 1066 } 1067 1068 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; 1069 if (IS_DIRSYNC(dir)) 1070 (void)fat_sync_inode(dir); 1071 else 1072 mark_inode_dirty(dir); 1073 1074 return 0; 1075} 1076EXPORT_SYMBOL_GPL(fat_remove_entries); 1077 1078static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, 1079 struct buffer_head **bhs, int nr_bhs) 1080{ 1081 struct super_block *sb = dir->i_sb; 1082 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; 1083 int err, i, n; 1084 1085 /* Zeroing the unused blocks on this cluster */ 1086 blknr += nr_used; 1087 n = nr_used; 1088 while (blknr < last_blknr) { 1089 bhs[n] = sb_getblk(sb, blknr); 1090 if (!bhs[n]) { 1091 err = -ENOMEM; 1092 goto error; 1093 } 1094 memset(bhs[n]->b_data, 0, sb->s_blocksize); 1095 set_buffer_uptodate(bhs[n]); 1096 mark_buffer_dirty_inode(bhs[n], dir); 1097 1098 n++; 1099 blknr++; 1100 if (n == nr_bhs) { 1101 if (IS_DIRSYNC(dir)) { 1102 err = fat_sync_bhs(bhs, n); 1103 if (err) 1104 goto error; 1105 } 1106 for (i = 0; i < n; i++) 1107 brelse(bhs[i]); 1108 n = 0; 1109 } 1110 } 1111 if (IS_DIRSYNC(dir)) { 1112 err = fat_sync_bhs(bhs, n); 1113 if (err) 1114 goto error; 1115 } 1116 for (i = 0; i < n; i++) 1117 brelse(bhs[i]); 1118 1119 return 0; 1120 1121error: 1122 for (i = 0; i < n; i++) 1123 bforget(bhs[i]); 1124 return err; 1125} 1126 1127int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) 1128{ 1129 struct super_block *sb = dir->i_sb; 1130 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1131 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1132 struct msdos_dir_entry *de; 1133 sector_t blknr; 1134 __le16 date, time; 1135 u8 time_cs; 1136 int err, cluster; 1137 1138 err = fat_alloc_clusters(dir, &cluster, 1); 1139 if (err) 1140 goto error; 1141 1142 blknr = fat_clus_to_blknr(sbi, cluster); 1143 bhs[0] = sb_getblk(sb, blknr); 1144 if (!bhs[0]) { 1145 err = -ENOMEM; 1146 goto error_free; 1147 } 1148 1149 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); 1150 1151 de = (struct msdos_dir_entry *)bhs[0]->b_data; 1152 /* filling the new directory slots ("." and ".." entries) */ 1153 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); 1154 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); 1155 de->attr = de[1].attr = ATTR_DIR; 1156 de[0].lcase = de[1].lcase = 0; 1157 de[0].time = de[1].time = time; 1158 de[0].date = de[1].date = date; 1159 if (sbi->options.isvfat) { 1160 /* extra timestamps */ 1161 de[0].ctime = de[1].ctime = time; 1162 de[0].ctime_cs = de[1].ctime_cs = time_cs; 1163 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; 1164 } else { 1165 de[0].ctime = de[1].ctime = 0; 1166 de[0].ctime_cs = de[1].ctime_cs = 0; 1167 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; 1168 } 1169 fat_set_start(&de[0], cluster); 1170 fat_set_start(&de[1], MSDOS_I(dir)->i_logstart); 1171 de[0].size = de[1].size = 0; 1172 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); 1173 set_buffer_uptodate(bhs[0]); 1174 mark_buffer_dirty_inode(bhs[0], dir); 1175 1176 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); 1177 if (err) 1178 goto error_free; 1179 1180 return cluster; 1181 1182error_free: 1183 fat_free_clusters(dir, cluster); 1184error: 1185 return err; 1186} 1187EXPORT_SYMBOL_GPL(fat_alloc_new_dir); 1188 1189static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, 1190 int *nr_cluster, struct msdos_dir_entry **de, 1191 struct buffer_head **bh, loff_t *i_pos) 1192{ 1193 struct super_block *sb = dir->i_sb; 1194 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1195 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1196 sector_t blknr, start_blknr, last_blknr; 1197 unsigned long size, copy; 1198 int err, i, n, offset, cluster[2]; 1199 1200 /* 1201 * The minimum cluster size is 512bytes, and maximum entry 1202 * size is 32*slots (672bytes). So, iff the cluster size is 1203 * 512bytes, we may need two clusters. 1204 */ 1205 size = nr_slots * sizeof(struct msdos_dir_entry); 1206 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; 1207 BUG_ON(*nr_cluster > 2); 1208 1209 err = fat_alloc_clusters(dir, cluster, *nr_cluster); 1210 if (err) 1211 goto error; 1212 1213 /* 1214 * First stage: Fill the directory entry. NOTE: This cluster 1215 * is not referenced from any inode yet, so updates order is 1216 * not important. 1217 */ 1218 i = n = copy = 0; 1219 do { 1220 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); 1221 last_blknr = start_blknr + sbi->sec_per_clus; 1222 while (blknr < last_blknr) { 1223 bhs[n] = sb_getblk(sb, blknr); 1224 if (!bhs[n]) { 1225 err = -ENOMEM; 1226 goto error_nomem; 1227 } 1228 1229 /* fill the directory entry */ 1230 copy = min(size, sb->s_blocksize); 1231 memcpy(bhs[n]->b_data, slots, copy); 1232 slots += copy; 1233 size -= copy; 1234 set_buffer_uptodate(bhs[n]); 1235 mark_buffer_dirty_inode(bhs[n], dir); 1236 if (!size) 1237 break; 1238 n++; 1239 blknr++; 1240 } 1241 } while (++i < *nr_cluster); 1242 1243 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); 1244 offset = copy - sizeof(struct msdos_dir_entry); 1245 get_bh(bhs[n]); 1246 *bh = bhs[n]; 1247 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 1248 *i_pos = fat_make_i_pos(sb, *bh, *de); 1249 1250 /* Second stage: clear the rest of cluster, and write outs */ 1251 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); 1252 if (err) 1253 goto error_free; 1254 1255 return cluster[0]; 1256 1257error_free: 1258 brelse(*bh); 1259 *bh = NULL; 1260 n = 0; 1261error_nomem: 1262 for (i = 0; i < n; i++) 1263 bforget(bhs[i]); 1264 fat_free_clusters(dir, cluster[0]); 1265error: 1266 return err; 1267} 1268 1269int fat_add_entries(struct inode *dir, void *slots, int nr_slots, 1270 struct fat_slot_info *sinfo) 1271{ 1272 struct super_block *sb = dir->i_sb; 1273 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1274 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ 1275 struct msdos_dir_entry *uninitialized_var(de); 1276 int err, free_slots, i, nr_bhs; 1277 loff_t pos, i_pos; 1278 1279 sinfo->nr_slots = nr_slots; 1280 1281 /* First stage: search free directory entries */ 1282 free_slots = nr_bhs = 0; 1283 bh = prev = NULL; 1284 pos = 0; 1285 err = -ENOSPC; 1286 while (fat_get_entry(dir, &pos, &bh, &de) > -1) { 1287 /* check the maximum size of directory */ 1288 if (pos >= FAT_MAX_DIR_SIZE) 1289 goto error; 1290 1291 if (IS_FREE(de->name)) { 1292 if (prev != bh) { 1293 get_bh(bh); 1294 bhs[nr_bhs] = prev = bh; 1295 nr_bhs++; 1296 } 1297 free_slots++; 1298 if (free_slots == nr_slots) 1299 goto found; 1300 } else { 1301 for (i = 0; i < nr_bhs; i++) 1302 brelse(bhs[i]); 1303 prev = NULL; 1304 free_slots = nr_bhs = 0; 1305 } 1306 } 1307 if (dir->i_ino == MSDOS_ROOT_INO) { 1308 if (sbi->fat_bits != 32) 1309 goto error; 1310 } else if (MSDOS_I(dir)->i_start == 0) { 1311 fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)", 1312 MSDOS_I(dir)->i_pos); 1313 err = -EIO; 1314 goto error; 1315 } 1316 1317found: 1318 err = 0; 1319 pos -= free_slots * sizeof(*de); 1320 nr_slots -= free_slots; 1321 if (free_slots) { 1322 /* 1323 * Second stage: filling the free entries with new entries. 1324 * NOTE: If this slots has shortname, first, we write 1325 * the long name slots, then write the short name. 1326 */ 1327 int size = free_slots * sizeof(*de); 1328 int offset = pos & (sb->s_blocksize - 1); 1329 int long_bhs = nr_bhs - (nr_slots == 0); 1330 1331 /* Fill the long name slots. */ 1332 for (i = 0; i < long_bhs; i++) { 1333 int copy = min_t(int, sb->s_blocksize - offset, size); 1334 memcpy(bhs[i]->b_data + offset, slots, copy); 1335 mark_buffer_dirty_inode(bhs[i], dir); 1336 offset = 0; 1337 slots += copy; 1338 size -= copy; 1339 } 1340 if (long_bhs && IS_DIRSYNC(dir)) 1341 err = fat_sync_bhs(bhs, long_bhs); 1342 if (!err && i < nr_bhs) { 1343 /* Fill the short name slot. */ 1344 int copy = min_t(int, sb->s_blocksize - offset, size); 1345 memcpy(bhs[i]->b_data + offset, slots, copy); 1346 mark_buffer_dirty_inode(bhs[i], dir); 1347 if (IS_DIRSYNC(dir)) 1348 err = sync_dirty_buffer(bhs[i]); 1349 } 1350 for (i = 0; i < nr_bhs; i++) 1351 brelse(bhs[i]); 1352 if (err) 1353 goto error_remove; 1354 } 1355 1356 if (nr_slots) { 1357 int cluster, nr_cluster; 1358 1359 /* 1360 * Third stage: allocate the cluster for new entries. 1361 * And initialize the cluster with new entries, then 1362 * add the cluster to dir. 1363 */ 1364 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, 1365 &de, &bh, &i_pos); 1366 if (cluster < 0) { 1367 err = cluster; 1368 goto error_remove; 1369 } 1370 err = fat_chain_add(dir, cluster, nr_cluster); 1371 if (err) { 1372 fat_free_clusters(dir, cluster); 1373 goto error_remove; 1374 } 1375 if (dir->i_size & (sbi->cluster_size - 1)) { 1376 fat_fs_error(sb, "Odd directory size"); 1377 dir->i_size = (dir->i_size + sbi->cluster_size - 1) 1378 & ~((loff_t)sbi->cluster_size - 1); 1379 } 1380 dir->i_size += nr_cluster << sbi->cluster_bits; 1381 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; 1382 } 1383 sinfo->slot_off = pos; 1384 sinfo->de = de; 1385 sinfo->bh = bh; 1386 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 1387 1388 return 0; 1389 1390error: 1391 brelse(bh); 1392 for (i = 0; i < nr_bhs; i++) 1393 brelse(bhs[i]); 1394 return err; 1395 1396error_remove: 1397 brelse(bh); 1398 if (free_slots) 1399 __fat_remove_entries(dir, pos, free_slots); 1400 return err; 1401} 1402EXPORT_SYMBOL_GPL(fat_add_entries); 1403