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/module.h> 17 #include <linux/slab.h> 18 #include <linux/time.h> 19 #include <linux/buffer_head.h> 20 #include <linux/compat.h> 21 #include <asm/uaccess.h> 22 #include "fat.h" 23 24 /* 25 * Maximum buffer size of short name. 26 * [(MSDOS_NAME + '.') * max one char + nul] 27 * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] 28 */ 29 #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) 30 /* 31 * Maximum buffer size of unicode chars from slots. 32 * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] 33 */ 34 #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) 35 #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) 36 37 static inline loff_t fat_make_i_pos(struct super_block *sb, 38 struct buffer_head *bh, 39 struct msdos_dir_entry *de) 40 { 41 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) 42 | (de - (struct msdos_dir_entry *)bh->b_data); 43 } 44 45 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, 46 sector_t phys) 47 { 48 struct super_block *sb = dir->i_sb; 49 struct msdos_sb_info *sbi = MSDOS_SB(sb); 50 struct buffer_head *bh; 51 int sec; 52 53 /* This is not a first sector of cluster, or sec_per_clus == 1 */ 54 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) 55 return; 56 /* root dir of FAT12/FAT16 */ 57 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) 58 return; 59 60 bh = sb_find_get_block(sb, phys); 61 if (bh == NULL || !buffer_uptodate(bh)) { 62 for (sec = 0; sec < sbi->sec_per_clus; sec++) 63 sb_breadahead(sb, phys + sec); 64 } 65 brelse(bh); 66 } 67 68 /* Returns the inode number of the directory entry at offset pos. If bh is 69 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is 70 returned in bh. 71 AV. Most often we do it item-by-item. Makes sense to optimize. 72 AV. OK, there we go: if both bh and de are non-NULL we assume that we just 73 AV. want the next entry (took one explicit de=NULL in vfat/namei.c). 74 AV. It's done in fat_get_entry() (inlined), here the slow case lives. 75 AV. Additionally, when we return -1 (i.e. reached the end of directory) 76 AV. we make bh NULL. 77 */ 78 static int fat__get_entry(struct inode *dir, loff_t *pos, 79 struct buffer_head **bh, struct msdos_dir_entry **de) 80 { 81 struct super_block *sb = dir->i_sb; 82 sector_t phys, iblock; 83 unsigned long mapped_blocks; 84 int err, offset; 85 86 next: 87 if (*bh) 88 brelse(*bh); 89 90 *bh = NULL; 91 iblock = *pos >> sb->s_blocksize_bits; 92 err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0); 93 if (err || !phys) 94 return -1; /* beyond EOF or error */ 95 96 fat_dir_readahead(dir, iblock, phys); 97 98 *bh = sb_bread(sb, phys); 99 if (*bh == NULL) { 100 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n", 101 (llu)phys); 102 /* skip this block */ 103 *pos = (iblock + 1) << sb->s_blocksize_bits; 104 goto next; 105 } 106 107 offset = *pos & (sb->s_blocksize - 1); 108 *pos += sizeof(struct msdos_dir_entry); 109 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 110 111 return 0; 112 } 113 114 static inline int fat_get_entry(struct inode *dir, loff_t *pos, 115 struct buffer_head **bh, 116 struct msdos_dir_entry **de) 117 { 118 /* Fast stuff first */ 119 if (*bh && *de && 120 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) { 121 *pos += sizeof(struct msdos_dir_entry); 122 (*de)++; 123 return 0; 124 } 125 return fat__get_entry(dir, pos, bh, de); 126 } 127 128 /* 129 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. 130 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a 131 * colon as an escape character since it is normally invalid on the vfat 132 * filesystem. The following four characters are the hexadecimal digits 133 * of Unicode value. This lets us do a full dump and restore of Unicode 134 * filenames. We could get into some trouble with long Unicode names, 135 * but ignore that right now. 136 * Ahem... Stack smashing in ring 0 isn't fun. Fixed. 137 */ 138 static int uni16_to_x8(unsigned char *ascii, const wchar_t *uni, int len, 139 int uni_xlate, struct nls_table *nls) 140 { 141 const wchar_t *ip; 142 wchar_t ec; 143 unsigned char *op, nc; 144 int charlen; 145 int k; 146 147 ip = uni; 148 op = ascii; 149 150 while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { 151 ec = *ip++; 152 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) { 153 op += charlen; 154 len -= charlen; 155 } else { 156 if (uni_xlate == 1) { 157 *op = ':'; 158 for (k = 4; k > 0; k--) { 159 nc = ec & 0xF; 160 op[k] = nc > 9 ? nc + ('a' - 10) 161 : nc + '0'; 162 ec >>= 4; 163 } 164 op += 5; 165 len -= 5; 166 } else { 167 *op++ = '?'; 168 len--; 169 } 170 } 171 } 172 173 if (unlikely(*ip)) { 174 printk(KERN_WARNING "FAT: filename was truncated while " 175 "converting."); 176 } 177 178 *op = 0; 179 return (op - ascii); 180 } 181 182 static inline int fat_uni_to_x8(struct msdos_sb_info *sbi, const wchar_t *uni, 183 unsigned char *buf, int size) 184 { 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(buf, uni, size, sbi->options.unicode_xlate, 190 sbi->nls_io); 191 } 192 193 static inline int 194 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 195 { 196 int charlen; 197 198 charlen = t->char2uni(c, clen, uni); 199 if (charlen < 0) { 200 *uni = 0x003f; /* a question mark */ 201 charlen = 1; 202 } 203 return charlen; 204 } 205 206 static inline int 207 fat_short2lower_uni(struct nls_table *t, unsigned char *c, 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 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) { 223 *uni = 0x003f; /* a question mark */ 224 charlen = 1; 225 } 226 } else 227 *uni = wc; 228 229 return charlen; 230 } 231 232 static inline int 233 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, 234 wchar_t *uni_buf, unsigned short opt, int lower) 235 { 236 int len = 0; 237 238 if (opt & VFAT_SFN_DISPLAY_LOWER) 239 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 240 else if (opt & VFAT_SFN_DISPLAY_WIN95) 241 len = fat_short2uni(nls, buf, buf_size, uni_buf); 242 else if (opt & VFAT_SFN_DISPLAY_WINNT) { 243 if (lower) 244 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 245 else 246 len = fat_short2uni(nls, buf, buf_size, uni_buf); 247 } else 248 len = fat_short2uni(nls, buf, buf_size, uni_buf); 249 250 return len; 251 } 252 253 static inline int fat_name_match(struct msdos_sb_info *sbi, 254 const unsigned char *a, int a_len, 255 const unsigned char *b, int b_len) 256 { 257 if (a_len != b_len) 258 return 0; 259 260 if (sbi->options.name_check != 's') 261 return !nls_strnicmp(sbi->nls_io, a, b, a_len); 262 else 263 return !memcmp(a, b, a_len); 264 } 265 266 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; 267 268 /** 269 * fat_parse_long - Parse extended directory entry. 270 * 271 * This function returns zero on success, negative value on error, or one of 272 * the following: 273 * 274 * %PARSE_INVALID - Directory entry is invalid. 275 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. 276 * %PARSE_EOF - Directory has no more entries. 277 */ 278 static int fat_parse_long(struct inode *dir, loff_t *pos, 279 struct buffer_head **bh, struct msdos_dir_entry **de, 280 wchar_t **unicode, unsigned char *nr_slots) 281 { 282 struct msdos_dir_slot *ds; 283 unsigned char id, slot, slots, alias_checksum; 284 285 if (!*unicode) { 286 *unicode = __getname(); 287 if (!*unicode) { 288 brelse(*bh); 289 return -ENOMEM; 290 } 291 } 292 parse_long: 293 slots = 0; 294 ds = (struct msdos_dir_slot *)*de; 295 id = ds->id; 296 if (!(id & 0x40)) 297 return PARSE_INVALID; 298 slots = id & ~0x40; 299 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ 300 return PARSE_INVALID; 301 *nr_slots = slots; 302 alias_checksum = ds->alias_checksum; 303 304 slot = slots; 305 while (1) { 306 int offset; 307 308 slot--; 309 offset = slot * 13; 310 fat16_towchar(*unicode + offset, ds->name0_4, 5); 311 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); 312 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); 313 314 if (ds->id & 0x40) 315 (*unicode)[offset + 13] = 0; 316 if (fat_get_entry(dir, pos, bh, de) < 0) 317 return PARSE_EOF; 318 if (slot == 0) 319 break; 320 ds = (struct msdos_dir_slot *)*de; 321 if (ds->attr != ATTR_EXT) 322 return PARSE_NOT_LONGNAME; 323 if ((ds->id & ~0x40) != slot) 324 goto parse_long; 325 if (ds->alias_checksum != alias_checksum) 326 goto parse_long; 327 } 328 if ((*de)->name[0] == DELETED_FLAG) 329 return PARSE_INVALID; 330 if ((*de)->attr == ATTR_EXT) 331 goto parse_long; 332 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) 333 return PARSE_INVALID; 334 if (fat_checksum((*de)->name) != alias_checksum) 335 *nr_slots = 0; 336 337 return 0; 338 } 339 340 /* 341 * Return values: negative -> error, 0 -> not found, positive -> found, 342 * value is the total amount of slots, including the shortname entry. 343 */ 344 int fat_search_long(struct inode *inode, const unsigned char *name, 345 int name_len, struct fat_slot_info *sinfo) 346 { 347 struct super_block *sb = inode->i_sb; 348 struct msdos_sb_info *sbi = MSDOS_SB(sb); 349 struct buffer_head *bh = NULL; 350 struct msdos_dir_entry *de; 351 struct nls_table *nls_disk = sbi->nls_disk; 352 unsigned char nr_slots; 353 wchar_t bufuname[14]; 354 wchar_t *unicode = NULL; 355 unsigned char work[MSDOS_NAME]; 356 unsigned char bufname[FAT_MAX_SHORT_SIZE]; 357 unsigned short opt_shortname = sbi->options.shortname; 358 loff_t cpos = 0; 359 int chl, i, j, last_u, err, len; 360 361 err = -ENOENT; 362 while (1) { 363 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 364 goto end_of_dir; 365 parse_record: 366 nr_slots = 0; 367 if (de->name[0] == DELETED_FLAG) 368 continue; 369 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 370 continue; 371 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 372 continue; 373 if (de->attr == ATTR_EXT) { 374 int status = fat_parse_long(inode, &cpos, &bh, &de, 375 &unicode, &nr_slots); 376 if (status < 0) { 377 err = status; 378 goto end_of_dir; 379 } else if (status == PARSE_INVALID) 380 continue; 381 else if (status == PARSE_NOT_LONGNAME) 382 goto parse_record; 383 else if (status == PARSE_EOF) 384 goto end_of_dir; 385 } 386 387 memcpy(work, de->name, sizeof(de->name)); 388 /* see namei.c, msdos_format_name */ 389 if (work[0] == 0x05) 390 work[0] = 0xE5; 391 for (i = 0, j = 0, last_u = 0; i < 8;) { 392 if (!work[i]) 393 break; 394 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 395 &bufuname[j++], opt_shortname, 396 de->lcase & CASE_LOWER_BASE); 397 if (chl <= 1) { 398 if (work[i] != ' ') 399 last_u = j; 400 } else { 401 last_u = j; 402 } 403 i += chl; 404 } 405 j = last_u; 406 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); 407 for (i = 8; i < MSDOS_NAME;) { 408 if (!work[i]) 409 break; 410 chl = fat_shortname2uni(nls_disk, &work[i], 411 MSDOS_NAME - i, 412 &bufuname[j++], opt_shortname, 413 de->lcase & CASE_LOWER_EXT); 414 if (chl <= 1) { 415 if (work[i] != ' ') 416 last_u = j; 417 } else { 418 last_u = j; 419 } 420 i += chl; 421 } 422 if (!last_u) 423 continue; 424 425 /* Compare shortname */ 426 bufuname[last_u] = 0x0000; 427 len = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); 428 if (fat_name_match(sbi, name, name_len, bufname, len)) 429 goto found; 430 431 if (nr_slots) { 432 void *longname = unicode + FAT_MAX_UNI_CHARS; 433 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 434 435 /* Compare longname */ 436 len = fat_uni_to_x8(sbi, unicode, longname, size); 437 if (fat_name_match(sbi, name, name_len, longname, len)) 438 goto found; 439 } 440 } 441 442 found: 443 nr_slots++; /* include the de */ 444 sinfo->slot_off = cpos - nr_slots * sizeof(*de); 445 sinfo->nr_slots = nr_slots; 446 sinfo->de = de; 447 sinfo->bh = bh; 448 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 449 err = 0; 450 end_of_dir: 451 if (unicode) 452 __putname(unicode); 453 454 return err; 455 } 456 457 EXPORT_SYMBOL_GPL(fat_search_long); 458 459 struct fat_ioctl_filldir_callback { 460 void __user *dirent; 461 int result; 462 /* for dir ioctl */ 463 const char *longname; 464 int long_len; 465 const char *shortname; 466 int short_len; 467 }; 468 469 static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, 470 filldir_t filldir, int short_only, int both) 471 { 472 struct super_block *sb = inode->i_sb; 473 struct msdos_sb_info *sbi = MSDOS_SB(sb); 474 struct buffer_head *bh; 475 struct msdos_dir_entry *de; 476 struct nls_table *nls_disk = sbi->nls_disk; 477 unsigned char nr_slots; 478 wchar_t bufuname[14]; 479 wchar_t *unicode = NULL; 480 unsigned char c, work[MSDOS_NAME]; 481 unsigned char bufname[FAT_MAX_SHORT_SIZE], *ptname = bufname; 482 unsigned short opt_shortname = sbi->options.shortname; 483 int isvfat = sbi->options.isvfat; 484 int nocase = sbi->options.nocase; 485 const char *fill_name = NULL; 486 unsigned long inum; 487 unsigned long lpos, dummy, *furrfu = &lpos; 488 loff_t cpos; 489 int chi, chl, i, i2, j, last, last_u, dotoffset = 0, fill_len = 0; 490 int ret = 0; 491 492 lock_super(sb); 493 494 cpos = filp->f_pos; 495 /* Fake . and .. for the root directory. */ 496 if (inode->i_ino == MSDOS_ROOT_INO) { 497 while (cpos < 2) { 498 if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0) 499 goto out; 500 cpos++; 501 filp->f_pos++; 502 } 503 if (cpos == 2) { 504 dummy = 2; 505 furrfu = &dummy; 506 cpos = 0; 507 } 508 } 509 if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { 510 ret = -ENOENT; 511 goto out; 512 } 513 514 bh = NULL; 515 get_new: 516 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 517 goto end_of_dir; 518 parse_record: 519 nr_slots = 0; 520 /* 521 * Check for long filename entry, but if short_only, we don't 522 * need to parse long filename. 523 */ 524 if (isvfat && !short_only) { 525 if (de->name[0] == DELETED_FLAG) 526 goto record_end; 527 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 528 goto record_end; 529 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 530 goto record_end; 531 } else { 532 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) 533 goto record_end; 534 } 535 536 if (isvfat && de->attr == ATTR_EXT) { 537 int status = fat_parse_long(inode, &cpos, &bh, &de, 538 &unicode, &nr_slots); 539 if (status < 0) { 540 filp->f_pos = cpos; 541 ret = status; 542 goto out; 543 } else if (status == PARSE_INVALID) 544 goto record_end; 545 else if (status == PARSE_NOT_LONGNAME) 546 goto parse_record; 547 else if (status == PARSE_EOF) 548 goto end_of_dir; 549 550 if (nr_slots) { 551 void *longname = unicode + FAT_MAX_UNI_CHARS; 552 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 553 int len = fat_uni_to_x8(sbi, unicode, longname, size); 554 555 fill_name = longname; 556 fill_len = len; 557 /* !both && !short_only, so we don't need shortname. */ 558 if (!both) 559 goto start_filldir; 560 } 561 } 562 563 if (sbi->options.dotsOK) { 564 ptname = bufname; 565 dotoffset = 0; 566 if (de->attr & ATTR_HIDDEN) { 567 *ptname++ = '.'; 568 dotoffset = 1; 569 } 570 } 571 572 memcpy(work, de->name, sizeof(de->name)); 573 /* see namei.c, msdos_format_name */ 574 if (work[0] == 0x05) 575 work[0] = 0xE5; 576 for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) { 577 if (!(c = work[i])) 578 break; 579 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 580 &bufuname[j++], opt_shortname, 581 de->lcase & CASE_LOWER_BASE); 582 if (chl <= 1) { 583 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; 584 if (c != ' ') { 585 last = i; 586 last_u = j; 587 } 588 } else { 589 last_u = j; 590 for (chi = 0; chi < chl && i < 8; chi++) { 591 ptname[i] = work[i]; 592 i++; last = i; 593 } 594 } 595 } 596 i = last; 597 j = last_u; 598 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); 599 ptname[i++] = '.'; 600 for (i2 = 8; i2 < MSDOS_NAME;) { 601 if (!(c = work[i2])) 602 break; 603 chl = fat_shortname2uni(nls_disk, &work[i2], MSDOS_NAME - i2, 604 &bufuname[j++], opt_shortname, 605 de->lcase & CASE_LOWER_EXT); 606 if (chl <= 1) { 607 i2++; 608 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; 609 if (c != ' ') { 610 last = i; 611 last_u = j; 612 } 613 } else { 614 last_u = j; 615 for (chi = 0; chi < chl && i2 < MSDOS_NAME; chi++) { 616 ptname[i++] = work[i2++]; 617 last = i; 618 } 619 } 620 } 621 if (!last) 622 goto record_end; 623 624 i = last + dotoffset; 625 j = last_u; 626 627 if (isvfat) { 628 bufuname[j] = 0x0000; 629 i = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); 630 } 631 if (nr_slots) { 632 /* hack for fat_ioctl_filldir() */ 633 struct fat_ioctl_filldir_callback *p = dirent; 634 635 p->longname = fill_name; 636 p->long_len = fill_len; 637 p->shortname = bufname; 638 p->short_len = i; 639 fill_name = NULL; 640 fill_len = 0; 641 } else { 642 fill_name = bufname; 643 fill_len = i; 644 } 645 646 start_filldir: 647 lpos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); 648 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) 649 inum = inode->i_ino; 650 else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 651 inum = parent_ino(filp->f_path.dentry); 652 } else { 653 loff_t i_pos = fat_make_i_pos(sb, bh, de); 654 struct inode *tmp = fat_iget(sb, i_pos); 655 if (tmp) { 656 inum = tmp->i_ino; 657 iput(tmp); 658 } else 659 inum = iunique(sb, MSDOS_ROOT_INO); 660 } 661 662 if (filldir(dirent, fill_name, fill_len, *furrfu, inum, 663 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0) 664 goto fill_failed; 665 666 record_end: 667 furrfu = &lpos; 668 filp->f_pos = cpos; 669 goto get_new; 670 end_of_dir: 671 filp->f_pos = cpos; 672 fill_failed: 673 brelse(bh); 674 if (unicode) 675 __putname(unicode); 676 out: 677 unlock_super(sb); 678 return ret; 679 } 680 681 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir) 682 { 683 struct inode *inode = filp->f_path.dentry->d_inode; 684 return __fat_readdir(inode, filp, dirent, filldir, 0, 0); 685 } 686 687 #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ 688 static int func(void *__buf, const char *name, int name_len, \ 689 loff_t offset, u64 ino, unsigned int d_type) \ 690 { \ 691 struct fat_ioctl_filldir_callback *buf = __buf; \ 692 struct dirent_type __user *d1 = buf->dirent; \ 693 struct dirent_type __user *d2 = d1 + 1; \ 694 \ 695 if (buf->result) \ 696 return -EINVAL; \ 697 buf->result++; \ 698 \ 699 if (name != NULL) { \ 700 /* dirent has only short name */ \ 701 if (name_len >= sizeof(d1->d_name)) \ 702 name_len = sizeof(d1->d_name) - 1; \ 703 \ 704 if (put_user(0, d2->d_name) || \ 705 put_user(0, &d2->d_reclen) || \ 706 copy_to_user(d1->d_name, name, name_len) || \ 707 put_user(0, d1->d_name + name_len) || \ 708 put_user(name_len, &d1->d_reclen)) \ 709 goto efault; \ 710 } else { \ 711 /* dirent has short and long name */ \ 712 const char *longname = buf->longname; \ 713 int long_len = buf->long_len; \ 714 const char *shortname = buf->shortname; \ 715 int short_len = buf->short_len; \ 716 \ 717 if (long_len >= sizeof(d1->d_name)) \ 718 long_len = sizeof(d1->d_name) - 1; \ 719 if (short_len >= sizeof(d1->d_name)) \ 720 short_len = sizeof(d1->d_name) - 1; \ 721 \ 722 if (copy_to_user(d2->d_name, longname, long_len) || \ 723 put_user(0, d2->d_name + long_len) || \ 724 put_user(long_len, &d2->d_reclen) || \ 725 put_user(ino, &d2->d_ino) || \ 726 put_user(offset, &d2->d_off) || \ 727 copy_to_user(d1->d_name, shortname, short_len) || \ 728 put_user(0, d1->d_name + short_len) || \ 729 put_user(short_len, &d1->d_reclen)) \ 730 goto efault; \ 731 } \ 732 return 0; \ 733 efault: \ 734 buf->result = -EFAULT; \ 735 return -EFAULT; \ 736 } 737 738 FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) 739 740 static int fat_ioctl_readdir(struct inode *inode, struct file *filp, 741 void __user *dirent, filldir_t filldir, 742 int short_only, int both) 743 { 744 struct fat_ioctl_filldir_callback buf; 745 int ret; 746 747 buf.dirent = dirent; 748 buf.result = 0; 749 mutex_lock(&inode->i_mutex); 750 ret = -ENOENT; 751 if (!IS_DEADDIR(inode)) { 752 ret = __fat_readdir(inode, filp, &buf, filldir, 753 short_only, both); 754 } 755 mutex_unlock(&inode->i_mutex); 756 if (ret >= 0) 757 ret = buf.result; 758 return ret; 759 } 760 761 static int fat_dir_ioctl(struct inode *inode, struct file *filp, 762 unsigned int cmd, unsigned long arg) 763 { 764 struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; 765 int short_only, both; 766 767 switch (cmd) { 768 case VFAT_IOCTL_READDIR_SHORT: 769 short_only = 1; 770 both = 0; 771 break; 772 case VFAT_IOCTL_READDIR_BOTH: 773 short_only = 0; 774 both = 1; 775 break; 776 default: 777 return fat_generic_ioctl(inode, filp, cmd, arg); 778 } 779 780 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2]))) 781 return -EFAULT; 782 /* 783 * Yes, we don't need this put_user() absolutely. However old 784 * code didn't return the right value. So, app use this value, 785 * in order to check whether it is EOF. 786 */ 787 if (put_user(0, &d1->d_reclen)) 788 return -EFAULT; 789 790 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, 791 short_only, both); 792 } 793 794 #ifdef CONFIG_COMPAT 795 #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) 796 #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) 797 798 FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) 799 800 static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, 801 unsigned long arg) 802 { 803 struct inode *inode = filp->f_path.dentry->d_inode; 804 struct compat_dirent __user *d1 = compat_ptr(arg); 805 int short_only, both; 806 807 switch (cmd) { 808 case VFAT_IOCTL_READDIR_SHORT32: 809 short_only = 1; 810 both = 0; 811 break; 812 case VFAT_IOCTL_READDIR_BOTH32: 813 short_only = 0; 814 both = 1; 815 break; 816 default: 817 return -ENOIOCTLCMD; 818 } 819 820 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) 821 return -EFAULT; 822 /* 823 * Yes, we don't need this put_user() absolutely. However old 824 * code didn't return the right value. So, app use this value, 825 * in order to check whether it is EOF. 826 */ 827 if (put_user(0, &d1->d_reclen)) 828 return -EFAULT; 829 830 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, 831 short_only, both); 832 } 833 #endif /* CONFIG_COMPAT */ 834 835 const struct file_operations fat_dir_operations = { 836 .llseek = generic_file_llseek, 837 .read = generic_read_dir, 838 .readdir = fat_readdir, 839 .ioctl = fat_dir_ioctl, 840 #ifdef CONFIG_COMPAT 841 .compat_ioctl = fat_compat_dir_ioctl, 842 #endif 843 .fsync = fat_file_fsync, 844 }; 845 846 static int fat_get_short_entry(struct inode *dir, loff_t *pos, 847 struct buffer_head **bh, 848 struct msdos_dir_entry **de) 849 { 850 while (fat_get_entry(dir, pos, bh, de) >= 0) { 851 /* free entry or long name entry or volume label */ 852 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) 853 return 0; 854 } 855 return -ENOENT; 856 } 857 858 /* 859 * The ".." entry can not provide the "struct fat_slot_info" informations 860 * for inode. So, this function provide the some informations only. 861 */ 862 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, 863 struct msdos_dir_entry **de, loff_t *i_pos) 864 { 865 loff_t offset; 866 867 offset = 0; 868 *bh = NULL; 869 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { 870 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) { 871 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de); 872 return 0; 873 } 874 } 875 return -ENOENT; 876 } 877 878 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); 879 880 /* See if directory is empty */ 881 int fat_dir_empty(struct inode *dir) 882 { 883 struct buffer_head *bh; 884 struct msdos_dir_entry *de; 885 loff_t cpos; 886 int result = 0; 887 888 bh = NULL; 889 cpos = 0; 890 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 891 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && 892 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 893 result = -ENOTEMPTY; 894 break; 895 } 896 } 897 brelse(bh); 898 return result; 899 } 900 901 EXPORT_SYMBOL_GPL(fat_dir_empty); 902 903 /* 904 * fat_subdirs counts the number of sub-directories of dir. It can be run 905 * on directories being created. 906 */ 907 int fat_subdirs(struct inode *dir) 908 { 909 struct buffer_head *bh; 910 struct msdos_dir_entry *de; 911 loff_t cpos; 912 int count = 0; 913 914 bh = NULL; 915 cpos = 0; 916 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 917 if (de->attr & ATTR_DIR) 918 count++; 919 } 920 brelse(bh); 921 return count; 922 } 923 924 /* 925 * Scans a directory for a given file (name points to its formatted name). 926 * Returns an error code or zero. 927 */ 928 int fat_scan(struct inode *dir, const unsigned char *name, 929 struct fat_slot_info *sinfo) 930 { 931 struct super_block *sb = dir->i_sb; 932 933 sinfo->slot_off = 0; 934 sinfo->bh = NULL; 935 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 936 &sinfo->de) >= 0) { 937 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { 938 sinfo->slot_off -= sizeof(*sinfo->de); 939 sinfo->nr_slots = 1; 940 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 941 return 0; 942 } 943 } 944 return -ENOENT; 945 } 946 947 EXPORT_SYMBOL_GPL(fat_scan); 948 949 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) 950 { 951 struct super_block *sb = dir->i_sb; 952 struct buffer_head *bh; 953 struct msdos_dir_entry *de, *endp; 954 int err = 0, orig_slots; 955 956 while (nr_slots) { 957 bh = NULL; 958 if (fat_get_entry(dir, &pos, &bh, &de) < 0) { 959 err = -EIO; 960 break; 961 } 962 963 orig_slots = nr_slots; 964 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); 965 while (nr_slots && de < endp) { 966 de->name[0] = DELETED_FLAG; 967 de++; 968 nr_slots--; 969 } 970 mark_buffer_dirty_inode(bh, dir); 971 if (IS_DIRSYNC(dir)) 972 err = sync_dirty_buffer(bh); 973 brelse(bh); 974 if (err) 975 break; 976 977 /* pos is *next* de's position, so this does `- sizeof(de)' */ 978 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); 979 } 980 981 return err; 982 } 983 984 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) 985 { 986 struct msdos_dir_entry *de; 987 struct buffer_head *bh; 988 int err = 0, nr_slots; 989 990 /* 991 * First stage: Remove the shortname. By this, the directory 992 * entry is removed. 993 */ 994 nr_slots = sinfo->nr_slots; 995 de = sinfo->de; 996 sinfo->de = NULL; 997 bh = sinfo->bh; 998 sinfo->bh = NULL; 999 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { 1000 de->name[0] = DELETED_FLAG; 1001 de--; 1002 nr_slots--; 1003 } 1004 mark_buffer_dirty_inode(bh, dir); 1005 if (IS_DIRSYNC(dir)) 1006 err = sync_dirty_buffer(bh); 1007 brelse(bh); 1008 if (err) 1009 return err; 1010 dir->i_version++; 1011 1012 if (nr_slots) { 1013 /* 1014 * Second stage: remove the remaining longname slots. 1015 * (This directory entry is already removed, and so return 1016 * the success) 1017 */ 1018 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); 1019 if (err) { 1020 printk(KERN_WARNING 1021 "FAT: Couldn't remove the long name slots\n"); 1022 } 1023 } 1024 1025 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; 1026 if (IS_DIRSYNC(dir)) 1027 (void)fat_sync_inode(dir); 1028 else 1029 mark_inode_dirty(dir); 1030 1031 return 0; 1032 } 1033 1034 EXPORT_SYMBOL_GPL(fat_remove_entries); 1035 1036 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, 1037 struct buffer_head **bhs, int nr_bhs) 1038 { 1039 struct super_block *sb = dir->i_sb; 1040 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; 1041 int err, i, n; 1042 1043 /* Zeroing the unused blocks on this cluster */ 1044 blknr += nr_used; 1045 n = nr_used; 1046 while (blknr < last_blknr) { 1047 bhs[n] = sb_getblk(sb, blknr); 1048 if (!bhs[n]) { 1049 err = -ENOMEM; 1050 goto error; 1051 } 1052 memset(bhs[n]->b_data, 0, sb->s_blocksize); 1053 set_buffer_uptodate(bhs[n]); 1054 mark_buffer_dirty_inode(bhs[n], dir); 1055 1056 n++; 1057 blknr++; 1058 if (n == nr_bhs) { 1059 if (IS_DIRSYNC(dir)) { 1060 err = fat_sync_bhs(bhs, n); 1061 if (err) 1062 goto error; 1063 } 1064 for (i = 0; i < n; i++) 1065 brelse(bhs[i]); 1066 n = 0; 1067 } 1068 } 1069 if (IS_DIRSYNC(dir)) { 1070 err = fat_sync_bhs(bhs, n); 1071 if (err) 1072 goto error; 1073 } 1074 for (i = 0; i < n; i++) 1075 brelse(bhs[i]); 1076 1077 return 0; 1078 1079 error: 1080 for (i = 0; i < n; i++) 1081 bforget(bhs[i]); 1082 return err; 1083 } 1084 1085 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) 1086 { 1087 struct super_block *sb = dir->i_sb; 1088 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1089 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1090 struct msdos_dir_entry *de; 1091 sector_t blknr; 1092 __le16 date, time; 1093 u8 time_cs; 1094 int err, cluster; 1095 1096 err = fat_alloc_clusters(dir, &cluster, 1); 1097 if (err) 1098 goto error; 1099 1100 blknr = fat_clus_to_blknr(sbi, cluster); 1101 bhs[0] = sb_getblk(sb, blknr); 1102 if (!bhs[0]) { 1103 err = -ENOMEM; 1104 goto error_free; 1105 } 1106 1107 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); 1108 1109 de = (struct msdos_dir_entry *)bhs[0]->b_data; 1110 /* filling the new directory slots ("." and ".." entries) */ 1111 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); 1112 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); 1113 de->attr = de[1].attr = ATTR_DIR; 1114 de[0].lcase = de[1].lcase = 0; 1115 de[0].time = de[1].time = time; 1116 de[0].date = de[1].date = date; 1117 if (sbi->options.isvfat) { 1118 /* extra timestamps */ 1119 de[0].ctime = de[1].ctime = time; 1120 de[0].ctime_cs = de[1].ctime_cs = time_cs; 1121 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; 1122 } else { 1123 de[0].ctime = de[1].ctime = 0; 1124 de[0].ctime_cs = de[1].ctime_cs = 0; 1125 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; 1126 } 1127 de[0].start = cpu_to_le16(cluster); 1128 de[0].starthi = cpu_to_le16(cluster >> 16); 1129 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart); 1130 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16); 1131 de[0].size = de[1].size = 0; 1132 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); 1133 set_buffer_uptodate(bhs[0]); 1134 mark_buffer_dirty_inode(bhs[0], dir); 1135 1136 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); 1137 if (err) 1138 goto error_free; 1139 1140 return cluster; 1141 1142 error_free: 1143 fat_free_clusters(dir, cluster); 1144 error: 1145 return err; 1146 } 1147 1148 EXPORT_SYMBOL_GPL(fat_alloc_new_dir); 1149 1150 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, 1151 int *nr_cluster, struct msdos_dir_entry **de, 1152 struct buffer_head **bh, loff_t *i_pos) 1153 { 1154 struct super_block *sb = dir->i_sb; 1155 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1156 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1157 sector_t blknr, start_blknr, last_blknr; 1158 unsigned long size, copy; 1159 int err, i, n, offset, cluster[2]; 1160 1161 /* 1162 * The minimum cluster size is 512bytes, and maximum entry 1163 * size is 32*slots (672bytes). So, iff the cluster size is 1164 * 512bytes, we may need two clusters. 1165 */ 1166 size = nr_slots * sizeof(struct msdos_dir_entry); 1167 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; 1168 BUG_ON(*nr_cluster > 2); 1169 1170 err = fat_alloc_clusters(dir, cluster, *nr_cluster); 1171 if (err) 1172 goto error; 1173 1174 /* 1175 * First stage: Fill the directory entry. NOTE: This cluster 1176 * is not referenced from any inode yet, so updates order is 1177 * not important. 1178 */ 1179 i = n = copy = 0; 1180 do { 1181 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); 1182 last_blknr = start_blknr + sbi->sec_per_clus; 1183 while (blknr < last_blknr) { 1184 bhs[n] = sb_getblk(sb, blknr); 1185 if (!bhs[n]) { 1186 err = -ENOMEM; 1187 goto error_nomem; 1188 } 1189 1190 /* fill the directory entry */ 1191 copy = min(size, sb->s_blocksize); 1192 memcpy(bhs[n]->b_data, slots, copy); 1193 slots += copy; 1194 size -= copy; 1195 set_buffer_uptodate(bhs[n]); 1196 mark_buffer_dirty_inode(bhs[n], dir); 1197 if (!size) 1198 break; 1199 n++; 1200 blknr++; 1201 } 1202 } while (++i < *nr_cluster); 1203 1204 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); 1205 offset = copy - sizeof(struct msdos_dir_entry); 1206 get_bh(bhs[n]); 1207 *bh = bhs[n]; 1208 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 1209 *i_pos = fat_make_i_pos(sb, *bh, *de); 1210 1211 /* Second stage: clear the rest of cluster, and write outs */ 1212 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); 1213 if (err) 1214 goto error_free; 1215 1216 return cluster[0]; 1217 1218 error_free: 1219 brelse(*bh); 1220 *bh = NULL; 1221 n = 0; 1222 error_nomem: 1223 for (i = 0; i < n; i++) 1224 bforget(bhs[i]); 1225 fat_free_clusters(dir, cluster[0]); 1226 error: 1227 return err; 1228 } 1229 1230 int fat_add_entries(struct inode *dir, void *slots, int nr_slots, 1231 struct fat_slot_info *sinfo) 1232 { 1233 struct super_block *sb = dir->i_sb; 1234 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1235 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ 1236 struct msdos_dir_entry *de; 1237 int err, free_slots, i, nr_bhs; 1238 loff_t pos, i_pos; 1239 1240 sinfo->nr_slots = nr_slots; 1241 1242 /* First stage: search free direcotry entries */ 1243 free_slots = nr_bhs = 0; 1244 bh = prev = NULL; 1245 pos = 0; 1246 err = -ENOSPC; 1247 while (fat_get_entry(dir, &pos, &bh, &de) > -1) { 1248 /* check the maximum size of directory */ 1249 if (pos >= FAT_MAX_DIR_SIZE) 1250 goto error; 1251 1252 if (IS_FREE(de->name)) { 1253 if (prev != bh) { 1254 get_bh(bh); 1255 bhs[nr_bhs] = prev = bh; 1256 nr_bhs++; 1257 } 1258 free_slots++; 1259 if (free_slots == nr_slots) 1260 goto found; 1261 } else { 1262 for (i = 0; i < nr_bhs; i++) 1263 brelse(bhs[i]); 1264 prev = NULL; 1265 free_slots = nr_bhs = 0; 1266 } 1267 } 1268 if (dir->i_ino == MSDOS_ROOT_INO) { 1269 if (sbi->fat_bits != 32) 1270 goto error; 1271 } else if (MSDOS_I(dir)->i_start == 0) { 1272 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n", 1273 MSDOS_I(dir)->i_pos); 1274 err = -EIO; 1275 goto error; 1276 } 1277 1278 found: 1279 err = 0; 1280 pos -= free_slots * sizeof(*de); 1281 nr_slots -= free_slots; 1282 if (free_slots) { 1283 /* 1284 * Second stage: filling the free entries with new entries. 1285 * NOTE: If this slots has shortname, first, we write 1286 * the long name slots, then write the short name. 1287 */ 1288 int size = free_slots * sizeof(*de); 1289 int offset = pos & (sb->s_blocksize - 1); 1290 int long_bhs = nr_bhs - (nr_slots == 0); 1291 1292 /* Fill the long name slots. */ 1293 for (i = 0; i < long_bhs; i++) { 1294 int copy = min_t(int, sb->s_blocksize - offset, size); 1295 memcpy(bhs[i]->b_data + offset, slots, copy); 1296 mark_buffer_dirty_inode(bhs[i], dir); 1297 offset = 0; 1298 slots += copy; 1299 size -= copy; 1300 } 1301 if (long_bhs && IS_DIRSYNC(dir)) 1302 err = fat_sync_bhs(bhs, long_bhs); 1303 if (!err && i < nr_bhs) { 1304 /* Fill the short name slot. */ 1305 int copy = min_t(int, sb->s_blocksize - offset, size); 1306 memcpy(bhs[i]->b_data + offset, slots, copy); 1307 mark_buffer_dirty_inode(bhs[i], dir); 1308 if (IS_DIRSYNC(dir)) 1309 err = sync_dirty_buffer(bhs[i]); 1310 } 1311 for (i = 0; i < nr_bhs; i++) 1312 brelse(bhs[i]); 1313 if (err) 1314 goto error_remove; 1315 } 1316 1317 if (nr_slots) { 1318 int cluster, nr_cluster; 1319 1320 /* 1321 * Third stage: allocate the cluster for new entries. 1322 * And initialize the cluster with new entries, then 1323 * add the cluster to dir. 1324 */ 1325 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, 1326 &de, &bh, &i_pos); 1327 if (cluster < 0) { 1328 err = cluster; 1329 goto error_remove; 1330 } 1331 err = fat_chain_add(dir, cluster, nr_cluster); 1332 if (err) { 1333 fat_free_clusters(dir, cluster); 1334 goto error_remove; 1335 } 1336 if (dir->i_size & (sbi->cluster_size - 1)) { 1337 fat_fs_error(sb, "Odd directory size"); 1338 dir->i_size = (dir->i_size + sbi->cluster_size - 1) 1339 & ~((loff_t)sbi->cluster_size - 1); 1340 } 1341 dir->i_size += nr_cluster << sbi->cluster_bits; 1342 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; 1343 } 1344 sinfo->slot_off = pos; 1345 sinfo->de = de; 1346 sinfo->bh = bh; 1347 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 1348 1349 return 0; 1350 1351 error: 1352 brelse(bh); 1353 for (i = 0; i < nr_bhs; i++) 1354 brelse(bhs[i]); 1355 return err; 1356 1357 error_remove: 1358 brelse(bh); 1359 if (free_slots) 1360 __fat_remove_entries(dir, pos, free_slots); 1361 return err; 1362 } 1363 1364 EXPORT_SYMBOL_GPL(fat_add_entries); 1365