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/msdos_fs.h> 20 #include <linux/smp_lock.h> 21 #include <linux/buffer_head.h> 22 #include <linux/compat.h> 23 #include <asm/uaccess.h> 24 25 static inline loff_t fat_make_i_pos(struct super_block *sb, 26 struct buffer_head *bh, 27 struct msdos_dir_entry *de) 28 { 29 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) 30 | (de - (struct msdos_dir_entry *)bh->b_data); 31 } 32 33 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, 34 sector_t phys) 35 { 36 struct super_block *sb = dir->i_sb; 37 struct msdos_sb_info *sbi = MSDOS_SB(sb); 38 struct buffer_head *bh; 39 int sec; 40 41 /* This is not a first sector of cluster, or sec_per_clus == 1 */ 42 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) 43 return; 44 /* root dir of FAT12/FAT16 */ 45 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) 46 return; 47 48 bh = sb_find_get_block(sb, phys); 49 if (bh == NULL || !buffer_uptodate(bh)) { 50 for (sec = 0; sec < sbi->sec_per_clus; sec++) 51 sb_breadahead(sb, phys + sec); 52 } 53 brelse(bh); 54 } 55 56 /* Returns the inode number of the directory entry at offset pos. If bh is 57 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is 58 returned in bh. 59 AV. Most often we do it item-by-item. Makes sense to optimize. 60 AV. OK, there we go: if both bh and de are non-NULL we assume that we just 61 AV. want the next entry (took one explicit de=NULL in vfat/namei.c). 62 AV. It's done in fat_get_entry() (inlined), here the slow case lives. 63 AV. Additionally, when we return -1 (i.e. reached the end of directory) 64 AV. we make bh NULL. 65 */ 66 static int fat__get_entry(struct inode *dir, loff_t *pos, 67 struct buffer_head **bh, struct msdos_dir_entry **de) 68 { 69 struct super_block *sb = dir->i_sb; 70 sector_t phys, iblock; 71 unsigned long mapped_blocks; 72 int err, offset; 73 74 next: 75 if (*bh) 76 brelse(*bh); 77 78 *bh = NULL; 79 iblock = *pos >> sb->s_blocksize_bits; 80 err = fat_bmap(dir, iblock, &phys, &mapped_blocks); 81 if (err || !phys) 82 return -1; /* beyond EOF or error */ 83 84 fat_dir_readahead(dir, iblock, phys); 85 86 *bh = sb_bread(sb, phys); 87 if (*bh == NULL) { 88 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n", 89 (unsigned long long)phys); 90 /* skip this block */ 91 *pos = (iblock + 1) << sb->s_blocksize_bits; 92 goto next; 93 } 94 95 offset = *pos & (sb->s_blocksize - 1); 96 *pos += sizeof(struct msdos_dir_entry); 97 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 98 99 return 0; 100 } 101 102 static inline int fat_get_entry(struct inode *dir, loff_t *pos, 103 struct buffer_head **bh, 104 struct msdos_dir_entry **de) 105 { 106 /* Fast stuff first */ 107 if (*bh && *de && 108 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) { 109 *pos += sizeof(struct msdos_dir_entry); 110 (*de)++; 111 return 0; 112 } 113 return fat__get_entry(dir, pos, bh, de); 114 } 115 116 /* 117 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. 118 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a 119 * colon as an escape character since it is normally invalid on the vfat 120 * filesystem. The following four characters are the hexadecimal digits 121 * of Unicode value. This lets us do a full dump and restore of Unicode 122 * filenames. We could get into some trouble with long Unicode names, 123 * but ignore that right now. 124 * Ahem... Stack smashing in ring 0 isn't fun. Fixed. 125 */ 126 static int uni16_to_x8(unsigned char *ascii, const wchar_t *uni, int len, 127 int uni_xlate, struct nls_table *nls) 128 { 129 const wchar_t *ip; 130 wchar_t ec; 131 unsigned char *op, nc; 132 int charlen; 133 int k; 134 135 ip = uni; 136 op = ascii; 137 138 while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { 139 ec = *ip++; 140 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) { 141 op += charlen; 142 len -= charlen; 143 } else { 144 if (uni_xlate == 1) { 145 *op = ':'; 146 for (k = 4; k > 0; k--) { 147 nc = ec & 0xF; 148 op[k] = nc > 9 ? nc + ('a' - 10) 149 : nc + '0'; 150 ec >>= 4; 151 } 152 op += 5; 153 len -= 5; 154 } else { 155 *op++ = '?'; 156 len--; 157 } 158 } 159 } 160 161 if (unlikely(*ip)) { 162 printk(KERN_WARNING "FAT: filename was truncated while " 163 "converting."); 164 } 165 166 *op = 0; 167 return (op - ascii); 168 } 169 170 static inline int fat_uni_to_x8(struct msdos_sb_info *sbi, const wchar_t *uni, 171 unsigned char *buf, int size) 172 { 173 if (sbi->options.utf8) 174 return utf8_wcstombs(buf, uni, size); 175 else 176 return uni16_to_x8(buf, uni, size, sbi->options.unicode_xlate, 177 sbi->nls_io); 178 } 179 180 static inline int 181 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 182 { 183 int charlen; 184 185 charlen = t->char2uni(c, clen, uni); 186 if (charlen < 0) { 187 *uni = 0x003f; /* a question mark */ 188 charlen = 1; 189 } 190 return charlen; 191 } 192 193 static inline int 194 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 195 { 196 int charlen; 197 wchar_t wc; 198 199 charlen = t->char2uni(c, clen, &wc); 200 if (charlen < 0) { 201 *uni = 0x003f; /* a question mark */ 202 charlen = 1; 203 } else if (charlen <= 1) { 204 unsigned char nc = t->charset2lower[*c]; 205 206 if (!nc) 207 nc = *c; 208 209 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) { 210 *uni = 0x003f; /* a question mark */ 211 charlen = 1; 212 } 213 } else 214 *uni = wc; 215 216 return charlen; 217 } 218 219 static inline int 220 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, 221 wchar_t *uni_buf, unsigned short opt, int lower) 222 { 223 int len = 0; 224 225 if (opt & VFAT_SFN_DISPLAY_LOWER) 226 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 227 else if (opt & VFAT_SFN_DISPLAY_WIN95) 228 len = fat_short2uni(nls, buf, buf_size, uni_buf); 229 else if (opt & VFAT_SFN_DISPLAY_WINNT) { 230 if (lower) 231 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 232 else 233 len = fat_short2uni(nls, buf, buf_size, uni_buf); 234 } else 235 len = fat_short2uni(nls, buf, buf_size, uni_buf); 236 237 return len; 238 } 239 240 static inline int fat_name_match(struct msdos_sb_info *sbi, 241 const unsigned char *a, int a_len, 242 const unsigned char *b, int b_len) 243 { 244 if (a_len != b_len) 245 return 0; 246 247 if (sbi->options.name_check != 's') 248 return !nls_strnicmp(sbi->nls_io, a, b, a_len); 249 else 250 return !memcmp(a, b, a_len); 251 } 252 253 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; 254 255 /** 256 * fat_parse_long - Parse extended directory entry. 257 * 258 * This function returns zero on success, negative value on error, or one of 259 * the following: 260 * 261 * %PARSE_INVALID - Directory entry is invalid. 262 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. 263 * %PARSE_EOF - Directory has no more entries. 264 */ 265 static int fat_parse_long(struct inode *dir, loff_t *pos, 266 struct buffer_head **bh, struct msdos_dir_entry **de, 267 wchar_t **unicode, unsigned char *nr_slots) 268 { 269 struct msdos_dir_slot *ds; 270 unsigned char id, slot, slots, alias_checksum; 271 272 if (!*unicode) { 273 *unicode = __getname(); 274 if (!*unicode) { 275 brelse(*bh); 276 return -ENOMEM; 277 } 278 } 279 parse_long: 280 slots = 0; 281 ds = (struct msdos_dir_slot *)*de; 282 id = ds->id; 283 if (!(id & 0x40)) 284 return PARSE_INVALID; 285 slots = id & ~0x40; 286 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ 287 return PARSE_INVALID; 288 *nr_slots = slots; 289 alias_checksum = ds->alias_checksum; 290 291 slot = slots; 292 while (1) { 293 int offset; 294 295 slot--; 296 offset = slot * 13; 297 fat16_towchar(*unicode + offset, ds->name0_4, 5); 298 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); 299 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); 300 301 if (ds->id & 0x40) 302 (*unicode)[offset + 13] = 0; 303 if (fat_get_entry(dir, pos, bh, de) < 0) 304 return PARSE_EOF; 305 if (slot == 0) 306 break; 307 ds = (struct msdos_dir_slot *)*de; 308 if (ds->attr != ATTR_EXT) 309 return PARSE_NOT_LONGNAME; 310 if ((ds->id & ~0x40) != slot) 311 goto parse_long; 312 if (ds->alias_checksum != alias_checksum) 313 goto parse_long; 314 } 315 if ((*de)->name[0] == DELETED_FLAG) 316 return PARSE_INVALID; 317 if ((*de)->attr == ATTR_EXT) 318 goto parse_long; 319 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) 320 return PARSE_INVALID; 321 if (fat_checksum((*de)->name) != alias_checksum) 322 *nr_slots = 0; 323 324 return 0; 325 } 326 327 /* 328 * Maximum buffer size of short name. 329 * [(MSDOS_NAME + '.') * max one char + nul] 330 * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] 331 */ 332 #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) 333 /* 334 * Maximum buffer size of unicode chars from slots. 335 * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] 336 */ 337 #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) 338 #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) 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 return status; 378 else if (status == PARSE_INVALID) 379 continue; 380 else if (status == PARSE_NOT_LONGNAME) 381 goto parse_record; 382 else if (status == PARSE_EOF) 383 goto end_of_dir; 384 } 385 386 memcpy(work, de->name, sizeof(de->name)); 387 /* see namei.c, msdos_format_name */ 388 if (work[0] == 0x05) 389 work[0] = 0xE5; 390 for (i = 0, j = 0, last_u = 0; i < 8;) { 391 if (!work[i]) 392 break; 393 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 394 &bufuname[j++], opt_shortname, 395 de->lcase & CASE_LOWER_BASE); 396 if (chl <= 1) { 397 if (work[i] != ' ') 398 last_u = j; 399 } else { 400 last_u = j; 401 } 402 i += chl; 403 } 404 j = last_u; 405 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); 406 for (i = 8; i < MSDOS_NAME;) { 407 if (!work[i]) 408 break; 409 chl = fat_shortname2uni(nls_disk, &work[i], 410 MSDOS_NAME - i, 411 &bufuname[j++], opt_shortname, 412 de->lcase & CASE_LOWER_EXT); 413 if (chl <= 1) { 414 if (work[i] != ' ') 415 last_u = j; 416 } else { 417 last_u = j; 418 } 419 i += chl; 420 } 421 if (!last_u) 422 continue; 423 424 /* Compare shortname */ 425 bufuname[last_u] = 0x0000; 426 len = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); 427 if (fat_name_match(sbi, name, name_len, bufname, len)) 428 goto found; 429 430 if (nr_slots) { 431 void *longname = unicode + FAT_MAX_UNI_CHARS; 432 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 433 434 /* Compare longname */ 435 len = fat_uni_to_x8(sbi, unicode, longname, size); 436 if (fat_name_match(sbi, name, name_len, longname, len)) 437 goto found; 438 } 439 } 440 441 found: 442 nr_slots++; /* include the de */ 443 sinfo->slot_off = cpos - nr_slots * sizeof(*de); 444 sinfo->nr_slots = nr_slots; 445 sinfo->de = de; 446 sinfo->bh = bh; 447 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 448 err = 0; 449 end_of_dir: 450 if (unicode) 451 __putname(unicode); 452 453 return err; 454 } 455 456 EXPORT_SYMBOL_GPL(fat_search_long); 457 458 struct fat_ioctl_filldir_callback { 459 void __user *dirent; 460 int result; 461 /* for dir ioctl */ 462 const char *longname; 463 int long_len; 464 const char *shortname; 465 int short_len; 466 }; 467 468 static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, 469 filldir_t filldir, int short_only, int both) 470 { 471 struct super_block *sb = inode->i_sb; 472 struct msdos_sb_info *sbi = MSDOS_SB(sb); 473 struct buffer_head *bh; 474 struct msdos_dir_entry *de; 475 struct nls_table *nls_disk = sbi->nls_disk; 476 unsigned char nr_slots; 477 wchar_t bufuname[14]; 478 wchar_t *unicode = NULL; 479 unsigned char c, work[MSDOS_NAME]; 480 unsigned char bufname[FAT_MAX_SHORT_SIZE], *ptname = bufname; 481 unsigned short opt_shortname = sbi->options.shortname; 482 int isvfat = sbi->options.isvfat; 483 int nocase = sbi->options.nocase; 484 const char *fill_name = NULL; 485 unsigned long inum; 486 unsigned long lpos, dummy, *furrfu = &lpos; 487 loff_t cpos; 488 int chi, chl, i, i2, j, last, last_u, dotoffset = 0, fill_len = 0; 489 int ret = 0; 490 491 lock_super(sb); 492 493 cpos = filp->f_pos; 494 /* Fake . and .. for the root directory. */ 495 if (inode->i_ino == MSDOS_ROOT_INO) { 496 while (cpos < 2) { 497 if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0) 498 goto out; 499 cpos++; 500 filp->f_pos++; 501 } 502 if (cpos == 2) { 503 dummy = 2; 504 furrfu = &dummy; 505 cpos = 0; 506 } 507 } 508 if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { 509 ret = -ENOENT; 510 goto out; 511 } 512 513 bh = NULL; 514 get_new: 515 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 516 goto end_of_dir; 517 parse_record: 518 nr_slots = 0; 519 /* 520 * Check for long filename entry, but if short_only, we don't 521 * need to parse long filename. 522 */ 523 if (isvfat && !short_only) { 524 if (de->name[0] == DELETED_FLAG) 525 goto record_end; 526 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 527 goto record_end; 528 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 529 goto record_end; 530 } else { 531 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) 532 goto record_end; 533 } 534 535 if (isvfat && de->attr == ATTR_EXT) { 536 int status = fat_parse_long(inode, &cpos, &bh, &de, 537 &unicode, &nr_slots); 538 if (status < 0) { 539 filp->f_pos = cpos; 540 ret = status; 541 goto out; 542 } else if (status == PARSE_INVALID) 543 goto record_end; 544 else if (status == PARSE_NOT_LONGNAME) 545 goto parse_record; 546 else if (status == PARSE_EOF) 547 goto end_of_dir; 548 549 if (nr_slots) { 550 void *longname = unicode + FAT_MAX_UNI_CHARS; 551 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 552 int len = fat_uni_to_x8(sbi, unicode, longname, size); 553 554 fill_name = longname; 555 fill_len = len; 556 /* !both && !short_only, so we don't need shortname. */ 557 if (!both) 558 goto start_filldir; 559 } 560 } 561 562 if (sbi->options.dotsOK) { 563 ptname = bufname; 564 dotoffset = 0; 565 if (de->attr & ATTR_HIDDEN) { 566 *ptname++ = '.'; 567 dotoffset = 1; 568 } 569 } 570 571 memcpy(work, de->name, sizeof(de->name)); 572 /* see namei.c, msdos_format_name */ 573 if (work[0] == 0x05) 574 work[0] = 0xE5; 575 for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) { 576 if (!(c = work[i])) 577 break; 578 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 579 &bufuname[j++], opt_shortname, 580 de->lcase & CASE_LOWER_BASE); 581 if (chl <= 1) { 582 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; 583 if (c != ' ') { 584 last = i; 585 last_u = j; 586 } 587 } else { 588 last_u = j; 589 for (chi = 0; chi < chl && i < 8; chi++) { 590 ptname[i] = work[i]; 591 i++; last = i; 592 } 593 } 594 } 595 i = last; 596 j = last_u; 597 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); 598 ptname[i++] = '.'; 599 for (i2 = 8; i2 < MSDOS_NAME;) { 600 if (!(c = work[i2])) 601 break; 602 chl = fat_shortname2uni(nls_disk, &work[i2], MSDOS_NAME - i2, 603 &bufuname[j++], opt_shortname, 604 de->lcase & CASE_LOWER_EXT); 605 if (chl <= 1) { 606 i2++; 607 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; 608 if (c != ' ') { 609 last = i; 610 last_u = j; 611 } 612 } else { 613 last_u = j; 614 for (chi = 0; chi < chl && i2 < MSDOS_NAME; chi++) { 615 ptname[i++] = work[i2++]; 616 last = i; 617 } 618 } 619 } 620 if (!last) 621 goto record_end; 622 623 i = last + dotoffset; 624 j = last_u; 625 626 if (isvfat) { 627 bufuname[j] = 0x0000; 628 i = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); 629 } 630 if (nr_slots) { 631 /* hack for fat_ioctl_filldir() */ 632 struct fat_ioctl_filldir_callback *p = dirent; 633 634 p->longname = fill_name; 635 p->long_len = fill_len; 636 p->shortname = bufname; 637 p->short_len = i; 638 fill_name = NULL; 639 fill_len = 0; 640 } else { 641 fill_name = bufname; 642 fill_len = i; 643 } 644 645 start_filldir: 646 lpos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); 647 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) 648 inum = inode->i_ino; 649 else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 650 inum = parent_ino(filp->f_path.dentry); 651 } else { 652 loff_t i_pos = fat_make_i_pos(sb, bh, de); 653 struct inode *tmp = fat_iget(sb, i_pos); 654 if (tmp) { 655 inum = tmp->i_ino; 656 iput(tmp); 657 } else 658 inum = iunique(sb, MSDOS_ROOT_INO); 659 } 660 661 if (filldir(dirent, fill_name, fill_len, *furrfu, inum, 662 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0) 663 goto fill_failed; 664 665 record_end: 666 furrfu = &lpos; 667 filp->f_pos = cpos; 668 goto get_new; 669 end_of_dir: 670 filp->f_pos = cpos; 671 fill_failed: 672 brelse(bh); 673 if (unicode) 674 __putname(unicode); 675 out: 676 unlock_super(sb); 677 return ret; 678 } 679 680 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir) 681 { 682 struct inode *inode = filp->f_path.dentry->d_inode; 683 return __fat_readdir(inode, filp, dirent, filldir, 0, 0); 684 } 685 686 #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ 687 static int func(void *__buf, const char *name, int name_len, \ 688 loff_t offset, u64 ino, unsigned int d_type) \ 689 { \ 690 struct fat_ioctl_filldir_callback *buf = __buf; \ 691 struct dirent_type __user *d1 = buf->dirent; \ 692 struct dirent_type __user *d2 = d1 + 1; \ 693 \ 694 if (buf->result) \ 695 return -EINVAL; \ 696 buf->result++; \ 697 \ 698 if (name != NULL) { \ 699 /* dirent has only short name */ \ 700 if (name_len >= sizeof(d1->d_name)) \ 701 name_len = sizeof(d1->d_name) - 1; \ 702 \ 703 if (put_user(0, d2->d_name) || \ 704 put_user(0, &d2->d_reclen) || \ 705 copy_to_user(d1->d_name, name, name_len) || \ 706 put_user(0, d1->d_name + name_len) || \ 707 put_user(name_len, &d1->d_reclen)) \ 708 goto efault; \ 709 } else { \ 710 /* dirent has short and long name */ \ 711 const char *longname = buf->longname; \ 712 int long_len = buf->long_len; \ 713 const char *shortname = buf->shortname; \ 714 int short_len = buf->short_len; \ 715 \ 716 if (long_len >= sizeof(d1->d_name)) \ 717 long_len = sizeof(d1->d_name) - 1; \ 718 if (short_len >= sizeof(d1->d_name)) \ 719 short_len = sizeof(d1->d_name) - 1; \ 720 \ 721 if (copy_to_user(d2->d_name, longname, long_len) || \ 722 put_user(0, d2->d_name + long_len) || \ 723 put_user(long_len, &d2->d_reclen) || \ 724 put_user(ino, &d2->d_ino) || \ 725 put_user(offset, &d2->d_off) || \ 726 copy_to_user(d1->d_name, shortname, short_len) || \ 727 put_user(0, d1->d_name + short_len) || \ 728 put_user(short_len, &d1->d_reclen)) \ 729 goto efault; \ 730 } \ 731 return 0; \ 732 efault: \ 733 buf->result = -EFAULT; \ 734 return -EFAULT; \ 735 } 736 737 FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) 738 739 static int fat_ioctl_readdir(struct inode *inode, struct file *filp, 740 void __user *dirent, filldir_t filldir, 741 int short_only, int both) 742 { 743 struct fat_ioctl_filldir_callback buf; 744 int ret; 745 746 buf.dirent = dirent; 747 buf.result = 0; 748 mutex_lock(&inode->i_mutex); 749 ret = -ENOENT; 750 if (!IS_DEADDIR(inode)) { 751 ret = __fat_readdir(inode, filp, &buf, filldir, 752 short_only, both); 753 } 754 mutex_unlock(&inode->i_mutex); 755 if (ret >= 0) 756 ret = buf.result; 757 return ret; 758 } 759 760 static int fat_dir_ioctl(struct inode *inode, struct file *filp, 761 unsigned int cmd, unsigned long arg) 762 { 763 struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; 764 int short_only, both; 765 766 switch (cmd) { 767 case VFAT_IOCTL_READDIR_SHORT: 768 short_only = 1; 769 both = 0; 770 break; 771 case VFAT_IOCTL_READDIR_BOTH: 772 short_only = 0; 773 both = 1; 774 break; 775 default: 776 return fat_generic_ioctl(inode, filp, cmd, arg); 777 } 778 779 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2]))) 780 return -EFAULT; 781 /* 782 * Yes, we don't need this put_user() absolutely. However old 783 * code didn't return the right value. So, app use this value, 784 * in order to check whether it is EOF. 785 */ 786 if (put_user(0, &d1->d_reclen)) 787 return -EFAULT; 788 789 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, 790 short_only, both); 791 } 792 793 #ifdef CONFIG_COMPAT 794 #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) 795 #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) 796 797 FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) 798 799 static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, 800 unsigned long arg) 801 { 802 struct inode *inode = filp->f_path.dentry->d_inode; 803 struct compat_dirent __user *d1 = compat_ptr(arg); 804 int short_only, both; 805 806 switch (cmd) { 807 case VFAT_IOCTL_READDIR_SHORT32: 808 short_only = 1; 809 both = 0; 810 break; 811 case VFAT_IOCTL_READDIR_BOTH32: 812 short_only = 0; 813 both = 1; 814 break; 815 default: 816 return -ENOIOCTLCMD; 817 } 818 819 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) 820 return -EFAULT; 821 /* 822 * Yes, we don't need this put_user() absolutely. However old 823 * code didn't return the right value. So, app use this value, 824 * in order to check whether it is EOF. 825 */ 826 if (put_user(0, &d1->d_reclen)) 827 return -EFAULT; 828 829 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, 830 short_only, both); 831 } 832 #endif /* CONFIG_COMPAT */ 833 834 const struct file_operations fat_dir_operations = { 835 .read = generic_read_dir, 836 .readdir = fat_readdir, 837 .ioctl = fat_dir_ioctl, 838 #ifdef CONFIG_COMPAT 839 .compat_ioctl = fat_compat_dir_ioctl, 840 #endif 841 .fsync = file_fsync, 842 .llseek = generic_file_llseek, 843 }; 844 845 static int fat_get_short_entry(struct inode *dir, loff_t *pos, 846 struct buffer_head **bh, 847 struct msdos_dir_entry **de) 848 { 849 while (fat_get_entry(dir, pos, bh, de) >= 0) { 850 /* free entry or long name entry or volume label */ 851 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) 852 return 0; 853 } 854 return -ENOENT; 855 } 856 857 /* 858 * The ".." entry can not provide the "struct fat_slot_info" informations 859 * for inode. So, this function provide the some informations only. 860 */ 861 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, 862 struct msdos_dir_entry **de, loff_t *i_pos) 863 { 864 loff_t offset; 865 866 offset = 0; 867 *bh = NULL; 868 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { 869 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) { 870 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de); 871 return 0; 872 } 873 } 874 return -ENOENT; 875 } 876 877 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); 878 879 /* See if directory is empty */ 880 int fat_dir_empty(struct inode *dir) 881 { 882 struct buffer_head *bh; 883 struct msdos_dir_entry *de; 884 loff_t cpos; 885 int result = 0; 886 887 bh = NULL; 888 cpos = 0; 889 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 890 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && 891 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 892 result = -ENOTEMPTY; 893 break; 894 } 895 } 896 brelse(bh); 897 return result; 898 } 899 900 EXPORT_SYMBOL_GPL(fat_dir_empty); 901 902 /* 903 * fat_subdirs counts the number of sub-directories of dir. It can be run 904 * on directories being created. 905 */ 906 int fat_subdirs(struct inode *dir) 907 { 908 struct buffer_head *bh; 909 struct msdos_dir_entry *de; 910 loff_t cpos; 911 int count = 0; 912 913 bh = NULL; 914 cpos = 0; 915 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 916 if (de->attr & ATTR_DIR) 917 count++; 918 } 919 brelse(bh); 920 return count; 921 } 922 923 /* 924 * Scans a directory for a given file (name points to its formatted name). 925 * Returns an error code or zero. 926 */ 927 int fat_scan(struct inode *dir, const unsigned char *name, 928 struct fat_slot_info *sinfo) 929 { 930 struct super_block *sb = dir->i_sb; 931 932 sinfo->slot_off = 0; 933 sinfo->bh = NULL; 934 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 935 &sinfo->de) >= 0) { 936 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { 937 sinfo->slot_off -= sizeof(*sinfo->de); 938 sinfo->nr_slots = 1; 939 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 940 return 0; 941 } 942 } 943 return -ENOENT; 944 } 945 946 EXPORT_SYMBOL_GPL(fat_scan); 947 948 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) 949 { 950 struct super_block *sb = dir->i_sb; 951 struct buffer_head *bh; 952 struct msdos_dir_entry *de, *endp; 953 int err = 0, orig_slots; 954 955 while (nr_slots) { 956 bh = NULL; 957 if (fat_get_entry(dir, &pos, &bh, &de) < 0) { 958 err = -EIO; 959 break; 960 } 961 962 orig_slots = nr_slots; 963 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); 964 while (nr_slots && de < endp) { 965 de->name[0] = DELETED_FLAG; 966 de++; 967 nr_slots--; 968 } 969 mark_buffer_dirty(bh); 970 if (IS_DIRSYNC(dir)) 971 err = sync_dirty_buffer(bh); 972 brelse(bh); 973 if (err) 974 break; 975 976 /* pos is *next* de's position, so this does `- sizeof(de)' */ 977 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); 978 } 979 980 return err; 981 } 982 983 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) 984 { 985 struct msdos_dir_entry *de; 986 struct buffer_head *bh; 987 int err = 0, nr_slots; 988 989 /* 990 * First stage: Remove the shortname. By this, the directory 991 * entry is removed. 992 */ 993 nr_slots = sinfo->nr_slots; 994 de = sinfo->de; 995 sinfo->de = NULL; 996 bh = sinfo->bh; 997 sinfo->bh = NULL; 998 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { 999 de->name[0] = DELETED_FLAG; 1000 de--; 1001 nr_slots--; 1002 } 1003 mark_buffer_dirty(bh); 1004 if (IS_DIRSYNC(dir)) 1005 err = sync_dirty_buffer(bh); 1006 brelse(bh); 1007 if (err) 1008 return err; 1009 dir->i_version++; 1010 1011 if (nr_slots) { 1012 /* 1013 * Second stage: remove the remaining longname slots. 1014 * (This directory entry is already removed, and so return 1015 * the success) 1016 */ 1017 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); 1018 if (err) { 1019 printk(KERN_WARNING 1020 "FAT: Couldn't remove the long name slots\n"); 1021 } 1022 } 1023 1024 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; 1025 if (IS_DIRSYNC(dir)) 1026 (void)fat_sync_inode(dir); 1027 else 1028 mark_inode_dirty(dir); 1029 1030 return 0; 1031 } 1032 1033 EXPORT_SYMBOL_GPL(fat_remove_entries); 1034 1035 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, 1036 struct buffer_head **bhs, int nr_bhs) 1037 { 1038 struct super_block *sb = dir->i_sb; 1039 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; 1040 int err, i, n; 1041 1042 /* Zeroing the unused blocks on this cluster */ 1043 blknr += nr_used; 1044 n = nr_used; 1045 while (blknr < last_blknr) { 1046 bhs[n] = sb_getblk(sb, blknr); 1047 if (!bhs[n]) { 1048 err = -ENOMEM; 1049 goto error; 1050 } 1051 memset(bhs[n]->b_data, 0, sb->s_blocksize); 1052 set_buffer_uptodate(bhs[n]); 1053 mark_buffer_dirty(bhs[n]); 1054 1055 n++; 1056 blknr++; 1057 if (n == nr_bhs) { 1058 if (IS_DIRSYNC(dir)) { 1059 err = fat_sync_bhs(bhs, n); 1060 if (err) 1061 goto error; 1062 } 1063 for (i = 0; i < n; i++) 1064 brelse(bhs[i]); 1065 n = 0; 1066 } 1067 } 1068 if (IS_DIRSYNC(dir)) { 1069 err = fat_sync_bhs(bhs, n); 1070 if (err) 1071 goto error; 1072 } 1073 for (i = 0; i < n; i++) 1074 brelse(bhs[i]); 1075 1076 return 0; 1077 1078 error: 1079 for (i = 0; i < n; i++) 1080 bforget(bhs[i]); 1081 return err; 1082 } 1083 1084 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) 1085 { 1086 struct super_block *sb = dir->i_sb; 1087 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1088 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1089 struct msdos_dir_entry *de; 1090 sector_t blknr; 1091 __le16 date, time; 1092 int err, cluster; 1093 1094 err = fat_alloc_clusters(dir, &cluster, 1); 1095 if (err) 1096 goto error; 1097 1098 blknr = fat_clus_to_blknr(sbi, cluster); 1099 bhs[0] = sb_getblk(sb, blknr); 1100 if (!bhs[0]) { 1101 err = -ENOMEM; 1102 goto error_free; 1103 } 1104 1105 fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc); 1106 1107 de = (struct msdos_dir_entry *)bhs[0]->b_data; 1108 /* filling the new directory slots ("." and ".." entries) */ 1109 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); 1110 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); 1111 de->attr = de[1].attr = ATTR_DIR; 1112 de[0].lcase = de[1].lcase = 0; 1113 de[0].time = de[1].time = time; 1114 de[0].date = de[1].date = date; 1115 de[0].ctime_cs = de[1].ctime_cs = 0; 1116 if (sbi->options.isvfat) { 1117 /* extra timestamps */ 1118 de[0].ctime = de[1].ctime = time; 1119 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; 1120 } else { 1121 de[0].ctime = de[1].ctime = 0; 1122 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; 1123 } 1124 de[0].start = cpu_to_le16(cluster); 1125 de[0].starthi = cpu_to_le16(cluster >> 16); 1126 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart); 1127 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16); 1128 de[0].size = de[1].size = 0; 1129 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); 1130 set_buffer_uptodate(bhs[0]); 1131 mark_buffer_dirty(bhs[0]); 1132 1133 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); 1134 if (err) 1135 goto error_free; 1136 1137 return cluster; 1138 1139 error_free: 1140 fat_free_clusters(dir, cluster); 1141 error: 1142 return err; 1143 } 1144 1145 EXPORT_SYMBOL_GPL(fat_alloc_new_dir); 1146 1147 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, 1148 int *nr_cluster, struct msdos_dir_entry **de, 1149 struct buffer_head **bh, loff_t *i_pos) 1150 { 1151 struct super_block *sb = dir->i_sb; 1152 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1153 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1154 sector_t blknr, start_blknr, last_blknr; 1155 unsigned long size, copy; 1156 int err, i, n, offset, cluster[2]; 1157 1158 /* 1159 * The minimum cluster size is 512bytes, and maximum entry 1160 * size is 32*slots (672bytes). So, iff the cluster size is 1161 * 512bytes, we may need two clusters. 1162 */ 1163 size = nr_slots * sizeof(struct msdos_dir_entry); 1164 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; 1165 BUG_ON(*nr_cluster > 2); 1166 1167 err = fat_alloc_clusters(dir, cluster, *nr_cluster); 1168 if (err) 1169 goto error; 1170 1171 /* 1172 * First stage: Fill the directory entry. NOTE: This cluster 1173 * is not referenced from any inode yet, so updates order is 1174 * not important. 1175 */ 1176 i = n = copy = 0; 1177 do { 1178 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); 1179 last_blknr = start_blknr + sbi->sec_per_clus; 1180 while (blknr < last_blknr) { 1181 bhs[n] = sb_getblk(sb, blknr); 1182 if (!bhs[n]) { 1183 err = -ENOMEM; 1184 goto error_nomem; 1185 } 1186 1187 /* fill the directory entry */ 1188 copy = min(size, sb->s_blocksize); 1189 memcpy(bhs[n]->b_data, slots, copy); 1190 slots += copy; 1191 size -= copy; 1192 set_buffer_uptodate(bhs[n]); 1193 mark_buffer_dirty(bhs[n]); 1194 if (!size) 1195 break; 1196 n++; 1197 blknr++; 1198 } 1199 } while (++i < *nr_cluster); 1200 1201 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); 1202 offset = copy - sizeof(struct msdos_dir_entry); 1203 get_bh(bhs[n]); 1204 *bh = bhs[n]; 1205 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 1206 *i_pos = fat_make_i_pos(sb, *bh, *de); 1207 1208 /* Second stage: clear the rest of cluster, and write outs */ 1209 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); 1210 if (err) 1211 goto error_free; 1212 1213 return cluster[0]; 1214 1215 error_free: 1216 brelse(*bh); 1217 *bh = NULL; 1218 n = 0; 1219 error_nomem: 1220 for (i = 0; i < n; i++) 1221 bforget(bhs[i]); 1222 fat_free_clusters(dir, cluster[0]); 1223 error: 1224 return err; 1225 } 1226 1227 int fat_add_entries(struct inode *dir, void *slots, int nr_slots, 1228 struct fat_slot_info *sinfo) 1229 { 1230 struct super_block *sb = dir->i_sb; 1231 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1232 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ 1233 struct msdos_dir_entry *de; 1234 int err, free_slots, i, nr_bhs; 1235 loff_t pos, i_pos; 1236 1237 sinfo->nr_slots = nr_slots; 1238 1239 /* First stage: search free direcotry entries */ 1240 free_slots = nr_bhs = 0; 1241 bh = prev = NULL; 1242 pos = 0; 1243 err = -ENOSPC; 1244 while (fat_get_entry(dir, &pos, &bh, &de) > -1) { 1245 /* check the maximum size of directory */ 1246 if (pos >= FAT_MAX_DIR_SIZE) 1247 goto error; 1248 1249 if (IS_FREE(de->name)) { 1250 if (prev != bh) { 1251 get_bh(bh); 1252 bhs[nr_bhs] = prev = bh; 1253 nr_bhs++; 1254 } 1255 free_slots++; 1256 if (free_slots == nr_slots) 1257 goto found; 1258 } else { 1259 for (i = 0; i < nr_bhs; i++) 1260 brelse(bhs[i]); 1261 prev = NULL; 1262 free_slots = nr_bhs = 0; 1263 } 1264 } 1265 if (dir->i_ino == MSDOS_ROOT_INO) { 1266 if (sbi->fat_bits != 32) 1267 goto error; 1268 } else if (MSDOS_I(dir)->i_start == 0) { 1269 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n", 1270 MSDOS_I(dir)->i_pos); 1271 err = -EIO; 1272 goto error; 1273 } 1274 1275 found: 1276 err = 0; 1277 pos -= free_slots * sizeof(*de); 1278 nr_slots -= free_slots; 1279 if (free_slots) { 1280 /* 1281 * Second stage: filling the free entries with new entries. 1282 * NOTE: If this slots has shortname, first, we write 1283 * the long name slots, then write the short name. 1284 */ 1285 int size = free_slots * sizeof(*de); 1286 int offset = pos & (sb->s_blocksize - 1); 1287 int long_bhs = nr_bhs - (nr_slots == 0); 1288 1289 /* Fill the long name slots. */ 1290 for (i = 0; i < long_bhs; i++) { 1291 int copy = min_t(int, sb->s_blocksize - offset, size); 1292 memcpy(bhs[i]->b_data + offset, slots, copy); 1293 mark_buffer_dirty(bhs[i]); 1294 offset = 0; 1295 slots += copy; 1296 size -= copy; 1297 } 1298 if (long_bhs && IS_DIRSYNC(dir)) 1299 err = fat_sync_bhs(bhs, long_bhs); 1300 if (!err && i < nr_bhs) { 1301 /* Fill the short name slot. */ 1302 int copy = min_t(int, sb->s_blocksize - offset, size); 1303 memcpy(bhs[i]->b_data + offset, slots, copy); 1304 mark_buffer_dirty(bhs[i]); 1305 if (IS_DIRSYNC(dir)) 1306 err = sync_dirty_buffer(bhs[i]); 1307 } 1308 for (i = 0; i < nr_bhs; i++) 1309 brelse(bhs[i]); 1310 if (err) 1311 goto error_remove; 1312 } 1313 1314 if (nr_slots) { 1315 int cluster, nr_cluster; 1316 1317 /* 1318 * Third stage: allocate the cluster for new entries. 1319 * And initialize the cluster with new entries, then 1320 * add the cluster to dir. 1321 */ 1322 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, 1323 &de, &bh, &i_pos); 1324 if (cluster < 0) { 1325 err = cluster; 1326 goto error_remove; 1327 } 1328 err = fat_chain_add(dir, cluster, nr_cluster); 1329 if (err) { 1330 fat_free_clusters(dir, cluster); 1331 goto error_remove; 1332 } 1333 if (dir->i_size & (sbi->cluster_size - 1)) { 1334 fat_fs_panic(sb, "Odd directory size"); 1335 dir->i_size = (dir->i_size + sbi->cluster_size - 1) 1336 & ~((loff_t)sbi->cluster_size - 1); 1337 } 1338 dir->i_size += nr_cluster << sbi->cluster_bits; 1339 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; 1340 } 1341 sinfo->slot_off = pos; 1342 sinfo->de = de; 1343 sinfo->bh = bh; 1344 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 1345 1346 return 0; 1347 1348 error: 1349 brelse(bh); 1350 for (i = 0; i < nr_bhs; i++) 1351 brelse(bhs[i]); 1352 return err; 1353 1354 error_remove: 1355 brelse(bh); 1356 if (free_slots) 1357 __fat_remove_entries(dir, pos, free_slots); 1358 return err; 1359 } 1360 1361 EXPORT_SYMBOL_GPL(fat_add_entries); 1362