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/smp_lock.h> 20 #include <linux/buffer_head.h> 21 #include <linux/compat.h> 22 #include <asm/uaccess.h> 23 #include "fat.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, 0); 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 (llu)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 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 = file_fsync, 844 .llseek = generic_file_llseek, 845 }; 846 847 static int fat_get_short_entry(struct inode *dir, loff_t *pos, 848 struct buffer_head **bh, 849 struct msdos_dir_entry **de) 850 { 851 while (fat_get_entry(dir, pos, bh, de) >= 0) { 852 /* free entry or long name entry or volume label */ 853 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) 854 return 0; 855 } 856 return -ENOENT; 857 } 858 859 /* 860 * The ".." entry can not provide the "struct fat_slot_info" informations 861 * for inode. So, this function provide the some informations only. 862 */ 863 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, 864 struct msdos_dir_entry **de, loff_t *i_pos) 865 { 866 loff_t offset; 867 868 offset = 0; 869 *bh = NULL; 870 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { 871 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) { 872 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de); 873 return 0; 874 } 875 } 876 return -ENOENT; 877 } 878 879 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); 880 881 /* See if directory is empty */ 882 int fat_dir_empty(struct inode *dir) 883 { 884 struct buffer_head *bh; 885 struct msdos_dir_entry *de; 886 loff_t cpos; 887 int result = 0; 888 889 bh = NULL; 890 cpos = 0; 891 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 892 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && 893 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 894 result = -ENOTEMPTY; 895 break; 896 } 897 } 898 brelse(bh); 899 return result; 900 } 901 902 EXPORT_SYMBOL_GPL(fat_dir_empty); 903 904 /* 905 * fat_subdirs counts the number of sub-directories of dir. It can be run 906 * on directories being created. 907 */ 908 int fat_subdirs(struct inode *dir) 909 { 910 struct buffer_head *bh; 911 struct msdos_dir_entry *de; 912 loff_t cpos; 913 int count = 0; 914 915 bh = NULL; 916 cpos = 0; 917 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 918 if (de->attr & ATTR_DIR) 919 count++; 920 } 921 brelse(bh); 922 return count; 923 } 924 925 /* 926 * Scans a directory for a given file (name points to its formatted name). 927 * Returns an error code or zero. 928 */ 929 int fat_scan(struct inode *dir, const unsigned char *name, 930 struct fat_slot_info *sinfo) 931 { 932 struct super_block *sb = dir->i_sb; 933 934 sinfo->slot_off = 0; 935 sinfo->bh = NULL; 936 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 937 &sinfo->de) >= 0) { 938 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { 939 sinfo->slot_off -= sizeof(*sinfo->de); 940 sinfo->nr_slots = 1; 941 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 942 return 0; 943 } 944 } 945 return -ENOENT; 946 } 947 948 EXPORT_SYMBOL_GPL(fat_scan); 949 950 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) 951 { 952 struct super_block *sb = dir->i_sb; 953 struct buffer_head *bh; 954 struct msdos_dir_entry *de, *endp; 955 int err = 0, orig_slots; 956 957 while (nr_slots) { 958 bh = NULL; 959 if (fat_get_entry(dir, &pos, &bh, &de) < 0) { 960 err = -EIO; 961 break; 962 } 963 964 orig_slots = nr_slots; 965 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); 966 while (nr_slots && de < endp) { 967 de->name[0] = DELETED_FLAG; 968 de++; 969 nr_slots--; 970 } 971 mark_buffer_dirty(bh); 972 if (IS_DIRSYNC(dir)) 973 err = sync_dirty_buffer(bh); 974 brelse(bh); 975 if (err) 976 break; 977 978 /* pos is *next* de's position, so this does `- sizeof(de)' */ 979 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); 980 } 981 982 return err; 983 } 984 985 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) 986 { 987 struct msdos_dir_entry *de; 988 struct buffer_head *bh; 989 int err = 0, nr_slots; 990 991 /* 992 * First stage: Remove the shortname. By this, the directory 993 * entry is removed. 994 */ 995 nr_slots = sinfo->nr_slots; 996 de = sinfo->de; 997 sinfo->de = NULL; 998 bh = sinfo->bh; 999 sinfo->bh = NULL; 1000 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { 1001 de->name[0] = DELETED_FLAG; 1002 de--; 1003 nr_slots--; 1004 } 1005 mark_buffer_dirty(bh); 1006 if (IS_DIRSYNC(dir)) 1007 err = sync_dirty_buffer(bh); 1008 brelse(bh); 1009 if (err) 1010 return err; 1011 dir->i_version++; 1012 1013 if (nr_slots) { 1014 /* 1015 * Second stage: remove the remaining longname slots. 1016 * (This directory entry is already removed, and so return 1017 * the success) 1018 */ 1019 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); 1020 if (err) { 1021 printk(KERN_WARNING 1022 "FAT: Couldn't remove the long name slots\n"); 1023 } 1024 } 1025 1026 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; 1027 if (IS_DIRSYNC(dir)) 1028 (void)fat_sync_inode(dir); 1029 else 1030 mark_inode_dirty(dir); 1031 1032 return 0; 1033 } 1034 1035 EXPORT_SYMBOL_GPL(fat_remove_entries); 1036 1037 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, 1038 struct buffer_head **bhs, int nr_bhs) 1039 { 1040 struct super_block *sb = dir->i_sb; 1041 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; 1042 int err, i, n; 1043 1044 /* Zeroing the unused blocks on this cluster */ 1045 blknr += nr_used; 1046 n = nr_used; 1047 while (blknr < last_blknr) { 1048 bhs[n] = sb_getblk(sb, blknr); 1049 if (!bhs[n]) { 1050 err = -ENOMEM; 1051 goto error; 1052 } 1053 memset(bhs[n]->b_data, 0, sb->s_blocksize); 1054 set_buffer_uptodate(bhs[n]); 1055 mark_buffer_dirty(bhs[n]); 1056 1057 n++; 1058 blknr++; 1059 if (n == nr_bhs) { 1060 if (IS_DIRSYNC(dir)) { 1061 err = fat_sync_bhs(bhs, n); 1062 if (err) 1063 goto error; 1064 } 1065 for (i = 0; i < n; i++) 1066 brelse(bhs[i]); 1067 n = 0; 1068 } 1069 } 1070 if (IS_DIRSYNC(dir)) { 1071 err = fat_sync_bhs(bhs, n); 1072 if (err) 1073 goto error; 1074 } 1075 for (i = 0; i < n; i++) 1076 brelse(bhs[i]); 1077 1078 return 0; 1079 1080 error: 1081 for (i = 0; i < n; i++) 1082 bforget(bhs[i]); 1083 return err; 1084 } 1085 1086 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) 1087 { 1088 struct super_block *sb = dir->i_sb; 1089 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1090 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1091 struct msdos_dir_entry *de; 1092 sector_t blknr; 1093 __le16 date, time; 1094 u8 time_cs; 1095 int err, cluster; 1096 1097 err = fat_alloc_clusters(dir, &cluster, 1); 1098 if (err) 1099 goto error; 1100 1101 blknr = fat_clus_to_blknr(sbi, cluster); 1102 bhs[0] = sb_getblk(sb, blknr); 1103 if (!bhs[0]) { 1104 err = -ENOMEM; 1105 goto error_free; 1106 } 1107 1108 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); 1109 1110 de = (struct msdos_dir_entry *)bhs[0]->b_data; 1111 /* filling the new directory slots ("." and ".." entries) */ 1112 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); 1113 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); 1114 de->attr = de[1].attr = ATTR_DIR; 1115 de[0].lcase = de[1].lcase = 0; 1116 de[0].time = de[1].time = time; 1117 de[0].date = de[1].date = date; 1118 if (sbi->options.isvfat) { 1119 /* extra timestamps */ 1120 de[0].ctime = de[1].ctime = time; 1121 de[0].ctime_cs = de[1].ctime_cs = time_cs; 1122 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; 1123 } else { 1124 de[0].ctime = de[1].ctime = 0; 1125 de[0].ctime_cs = de[1].ctime_cs = 0; 1126 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; 1127 } 1128 de[0].start = cpu_to_le16(cluster); 1129 de[0].starthi = cpu_to_le16(cluster >> 16); 1130 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart); 1131 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16); 1132 de[0].size = de[1].size = 0; 1133 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); 1134 set_buffer_uptodate(bhs[0]); 1135 mark_buffer_dirty(bhs[0]); 1136 1137 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); 1138 if (err) 1139 goto error_free; 1140 1141 return cluster; 1142 1143 error_free: 1144 fat_free_clusters(dir, cluster); 1145 error: 1146 return err; 1147 } 1148 1149 EXPORT_SYMBOL_GPL(fat_alloc_new_dir); 1150 1151 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, 1152 int *nr_cluster, struct msdos_dir_entry **de, 1153 struct buffer_head **bh, loff_t *i_pos) 1154 { 1155 struct super_block *sb = dir->i_sb; 1156 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1157 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1158 sector_t blknr, start_blknr, last_blknr; 1159 unsigned long size, copy; 1160 int err, i, n, offset, cluster[2]; 1161 1162 /* 1163 * The minimum cluster size is 512bytes, and maximum entry 1164 * size is 32*slots (672bytes). So, iff the cluster size is 1165 * 512bytes, we may need two clusters. 1166 */ 1167 size = nr_slots * sizeof(struct msdos_dir_entry); 1168 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; 1169 BUG_ON(*nr_cluster > 2); 1170 1171 err = fat_alloc_clusters(dir, cluster, *nr_cluster); 1172 if (err) 1173 goto error; 1174 1175 /* 1176 * First stage: Fill the directory entry. NOTE: This cluster 1177 * is not referenced from any inode yet, so updates order is 1178 * not important. 1179 */ 1180 i = n = copy = 0; 1181 do { 1182 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); 1183 last_blknr = start_blknr + sbi->sec_per_clus; 1184 while (blknr < last_blknr) { 1185 bhs[n] = sb_getblk(sb, blknr); 1186 if (!bhs[n]) { 1187 err = -ENOMEM; 1188 goto error_nomem; 1189 } 1190 1191 /* fill the directory entry */ 1192 copy = min(size, sb->s_blocksize); 1193 memcpy(bhs[n]->b_data, slots, copy); 1194 slots += copy; 1195 size -= copy; 1196 set_buffer_uptodate(bhs[n]); 1197 mark_buffer_dirty(bhs[n]); 1198 if (!size) 1199 break; 1200 n++; 1201 blknr++; 1202 } 1203 } while (++i < *nr_cluster); 1204 1205 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); 1206 offset = copy - sizeof(struct msdos_dir_entry); 1207 get_bh(bhs[n]); 1208 *bh = bhs[n]; 1209 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 1210 *i_pos = fat_make_i_pos(sb, *bh, *de); 1211 1212 /* Second stage: clear the rest of cluster, and write outs */ 1213 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); 1214 if (err) 1215 goto error_free; 1216 1217 return cluster[0]; 1218 1219 error_free: 1220 brelse(*bh); 1221 *bh = NULL; 1222 n = 0; 1223 error_nomem: 1224 for (i = 0; i < n; i++) 1225 bforget(bhs[i]); 1226 fat_free_clusters(dir, cluster[0]); 1227 error: 1228 return err; 1229 } 1230 1231 int fat_add_entries(struct inode *dir, void *slots, int nr_slots, 1232 struct fat_slot_info *sinfo) 1233 { 1234 struct super_block *sb = dir->i_sb; 1235 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1236 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ 1237 struct msdos_dir_entry *de; 1238 int err, free_slots, i, nr_bhs; 1239 loff_t pos, i_pos; 1240 1241 sinfo->nr_slots = nr_slots; 1242 1243 /* First stage: search free direcotry entries */ 1244 free_slots = nr_bhs = 0; 1245 bh = prev = NULL; 1246 pos = 0; 1247 err = -ENOSPC; 1248 while (fat_get_entry(dir, &pos, &bh, &de) > -1) { 1249 /* check the maximum size of directory */ 1250 if (pos >= FAT_MAX_DIR_SIZE) 1251 goto error; 1252 1253 if (IS_FREE(de->name)) { 1254 if (prev != bh) { 1255 get_bh(bh); 1256 bhs[nr_bhs] = prev = bh; 1257 nr_bhs++; 1258 } 1259 free_slots++; 1260 if (free_slots == nr_slots) 1261 goto found; 1262 } else { 1263 for (i = 0; i < nr_bhs; i++) 1264 brelse(bhs[i]); 1265 prev = NULL; 1266 free_slots = nr_bhs = 0; 1267 } 1268 } 1269 if (dir->i_ino == MSDOS_ROOT_INO) { 1270 if (sbi->fat_bits != 32) 1271 goto error; 1272 } else if (MSDOS_I(dir)->i_start == 0) { 1273 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n", 1274 MSDOS_I(dir)->i_pos); 1275 err = -EIO; 1276 goto error; 1277 } 1278 1279 found: 1280 err = 0; 1281 pos -= free_slots * sizeof(*de); 1282 nr_slots -= free_slots; 1283 if (free_slots) { 1284 /* 1285 * Second stage: filling the free entries with new entries. 1286 * NOTE: If this slots has shortname, first, we write 1287 * the long name slots, then write the short name. 1288 */ 1289 int size = free_slots * sizeof(*de); 1290 int offset = pos & (sb->s_blocksize - 1); 1291 int long_bhs = nr_bhs - (nr_slots == 0); 1292 1293 /* Fill the long name slots. */ 1294 for (i = 0; i < long_bhs; i++) { 1295 int copy = min_t(int, sb->s_blocksize - offset, size); 1296 memcpy(bhs[i]->b_data + offset, slots, copy); 1297 mark_buffer_dirty(bhs[i]); 1298 offset = 0; 1299 slots += copy; 1300 size -= copy; 1301 } 1302 if (long_bhs && IS_DIRSYNC(dir)) 1303 err = fat_sync_bhs(bhs, long_bhs); 1304 if (!err && i < nr_bhs) { 1305 /* Fill the short name slot. */ 1306 int copy = min_t(int, sb->s_blocksize - offset, size); 1307 memcpy(bhs[i]->b_data + offset, slots, copy); 1308 mark_buffer_dirty(bhs[i]); 1309 if (IS_DIRSYNC(dir)) 1310 err = sync_dirty_buffer(bhs[i]); 1311 } 1312 for (i = 0; i < nr_bhs; i++) 1313 brelse(bhs[i]); 1314 if (err) 1315 goto error_remove; 1316 } 1317 1318 if (nr_slots) { 1319 int cluster, nr_cluster; 1320 1321 /* 1322 * Third stage: allocate the cluster for new entries. 1323 * And initialize the cluster with new entries, then 1324 * add the cluster to dir. 1325 */ 1326 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, 1327 &de, &bh, &i_pos); 1328 if (cluster < 0) { 1329 err = cluster; 1330 goto error_remove; 1331 } 1332 err = fat_chain_add(dir, cluster, nr_cluster); 1333 if (err) { 1334 fat_free_clusters(dir, cluster); 1335 goto error_remove; 1336 } 1337 if (dir->i_size & (sbi->cluster_size - 1)) { 1338 fat_fs_panic(sb, "Odd directory size"); 1339 dir->i_size = (dir->i_size + sbi->cluster_size - 1) 1340 & ~((loff_t)sbi->cluster_size - 1); 1341 } 1342 dir->i_size += nr_cluster << sbi->cluster_bits; 1343 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; 1344 } 1345 sinfo->slot_off = pos; 1346 sinfo->de = de; 1347 sinfo->bh = bh; 1348 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 1349 1350 return 0; 1351 1352 error: 1353 brelse(bh); 1354 for (i = 0; i < nr_bhs; i++) 1355 brelse(bhs[i]); 1356 return err; 1357 1358 error_remove: 1359 brelse(bh); 1360 if (free_slots) 1361 __fat_remove_entries(dir, pos, free_slots); 1362 return err; 1363 } 1364 1365 EXPORT_SYMBOL_GPL(fat_add_entries); 1366