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 <linux/kernel.h> 23 #include "fat.h" 24 25 /* 26 * Maximum buffer size of short name. 27 * [(MSDOS_NAME + '.') * max one char + nul] 28 * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] 29 */ 30 #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) 31 /* 32 * Maximum buffer size of unicode chars from slots. 33 * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] 34 */ 35 #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) 36 #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) 37 38 static inline loff_t fat_make_i_pos(struct super_block *sb, 39 struct buffer_head *bh, 40 struct msdos_dir_entry *de) 41 { 42 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) 43 | (de - (struct msdos_dir_entry *)bh->b_data); 44 } 45 46 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, 47 sector_t phys) 48 { 49 struct super_block *sb = dir->i_sb; 50 struct msdos_sb_info *sbi = MSDOS_SB(sb); 51 struct buffer_head *bh; 52 int sec; 53 54 /* This is not a first sector of cluster, or sec_per_clus == 1 */ 55 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) 56 return; 57 /* root dir of FAT12/FAT16 */ 58 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) 59 return; 60 61 bh = sb_find_get_block(sb, phys); 62 if (bh == NULL || !buffer_uptodate(bh)) { 63 for (sec = 0; sec < sbi->sec_per_clus; sec++) 64 sb_breadahead(sb, phys + sec); 65 } 66 brelse(bh); 67 } 68 69 /* Returns the inode number of the directory entry at offset pos. If bh is 70 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is 71 returned in bh. 72 AV. Most often we do it item-by-item. Makes sense to optimize. 73 AV. OK, there we go: if both bh and de are non-NULL we assume that we just 74 AV. want the next entry (took one explicit de=NULL in vfat/namei.c). 75 AV. It's done in fat_get_entry() (inlined), here the slow case lives. 76 AV. Additionally, when we return -1 (i.e. reached the end of directory) 77 AV. we make bh NULL. 78 */ 79 static int fat__get_entry(struct inode *dir, loff_t *pos, 80 struct buffer_head **bh, struct msdos_dir_entry **de) 81 { 82 struct super_block *sb = dir->i_sb; 83 sector_t phys, iblock; 84 unsigned long mapped_blocks; 85 int err, offset; 86 87 next: 88 if (*bh) 89 brelse(*bh); 90 91 *bh = NULL; 92 iblock = *pos >> sb->s_blocksize_bits; 93 err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0); 94 if (err || !phys) 95 return -1; /* beyond EOF or error */ 96 97 fat_dir_readahead(dir, iblock, phys); 98 99 *bh = sb_bread(sb, phys); 100 if (*bh == NULL) { 101 fat_msg(sb, KERN_ERR, "Directory bread(block %llu) failed", 102 (llu)phys); 103 /* skip this block */ 104 *pos = (iblock + 1) << sb->s_blocksize_bits; 105 goto next; 106 } 107 108 offset = *pos & (sb->s_blocksize - 1); 109 *pos += sizeof(struct msdos_dir_entry); 110 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 111 112 return 0; 113 } 114 115 static inline int fat_get_entry(struct inode *dir, loff_t *pos, 116 struct buffer_head **bh, 117 struct msdos_dir_entry **de) 118 { 119 /* Fast stuff first */ 120 if (*bh && *de && 121 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) { 122 *pos += sizeof(struct msdos_dir_entry); 123 (*de)++; 124 return 0; 125 } 126 return fat__get_entry(dir, pos, bh, de); 127 } 128 129 /* 130 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. 131 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a 132 * colon as an escape character since it is normally invalid on the vfat 133 * filesystem. The following four characters are the hexadecimal digits 134 * of Unicode value. This lets us do a full dump and restore of Unicode 135 * filenames. We could get into some trouble with long Unicode names, 136 * but ignore that right now. 137 * Ahem... Stack smashing in ring 0 isn't fun. Fixed. 138 */ 139 static int uni16_to_x8(struct super_block *sb, unsigned char *ascii, 140 const wchar_t *uni, int len, struct nls_table *nls) 141 { 142 int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate; 143 const wchar_t *ip; 144 wchar_t ec; 145 unsigned char *op; 146 int charlen; 147 148 ip = uni; 149 op = ascii; 150 151 while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { 152 ec = *ip++; 153 if ((charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) { 154 op += charlen; 155 len -= charlen; 156 } else { 157 if (uni_xlate == 1) { 158 *op++ = ':'; 159 op = hex_byte_pack(op, ec >> 8); 160 op = hex_byte_pack(op, ec); 161 len -= 5; 162 } else { 163 *op++ = '?'; 164 len--; 165 } 166 } 167 } 168 169 if (unlikely(*ip)) { 170 fat_msg(sb, KERN_WARNING, "filename was truncated while " 171 "converting."); 172 } 173 174 *op = 0; 175 return (op - ascii); 176 } 177 178 static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni, 179 unsigned char *buf, int size) 180 { 181 struct msdos_sb_info *sbi = MSDOS_SB(sb); 182 if (sbi->options.utf8) 183 return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS, 184 UTF16_HOST_ENDIAN, buf, size); 185 else 186 return uni16_to_x8(sb, buf, uni, size, sbi->nls_io); 187 } 188 189 static inline int 190 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 191 { 192 int charlen; 193 194 charlen = t->char2uni(c, clen, uni); 195 if (charlen < 0) { 196 *uni = 0x003f; /* a question mark */ 197 charlen = 1; 198 } 199 return charlen; 200 } 201 202 static inline int 203 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 204 { 205 int charlen; 206 wchar_t wc; 207 208 charlen = t->char2uni(c, clen, &wc); 209 if (charlen < 0) { 210 *uni = 0x003f; /* a question mark */ 211 charlen = 1; 212 } else if (charlen <= 1) { 213 unsigned char nc = t->charset2lower[*c]; 214 215 if (!nc) 216 nc = *c; 217 218 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) { 219 *uni = 0x003f; /* a question mark */ 220 charlen = 1; 221 } 222 } else 223 *uni = wc; 224 225 return charlen; 226 } 227 228 static inline int 229 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, 230 wchar_t *uni_buf, unsigned short opt, int lower) 231 { 232 int len = 0; 233 234 if (opt & VFAT_SFN_DISPLAY_LOWER) 235 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 236 else if (opt & VFAT_SFN_DISPLAY_WIN95) 237 len = fat_short2uni(nls, buf, buf_size, uni_buf); 238 else if (opt & VFAT_SFN_DISPLAY_WINNT) { 239 if (lower) 240 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 241 else 242 len = fat_short2uni(nls, buf, buf_size, uni_buf); 243 } else 244 len = fat_short2uni(nls, buf, buf_size, uni_buf); 245 246 return len; 247 } 248 249 static inline int fat_name_match(struct msdos_sb_info *sbi, 250 const unsigned char *a, int a_len, 251 const unsigned char *b, int b_len) 252 { 253 if (a_len != b_len) 254 return 0; 255 256 if (sbi->options.name_check != 's') 257 return !nls_strnicmp(sbi->nls_io, a, b, a_len); 258 else 259 return !memcmp(a, b, a_len); 260 } 261 262 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; 263 264 /** 265 * fat_parse_long - Parse extended directory entry. 266 * 267 * This function returns zero on success, negative value on error, or one of 268 * the following: 269 * 270 * %PARSE_INVALID - Directory entry is invalid. 271 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. 272 * %PARSE_EOF - Directory has no more entries. 273 */ 274 static int fat_parse_long(struct inode *dir, loff_t *pos, 275 struct buffer_head **bh, struct msdos_dir_entry **de, 276 wchar_t **unicode, unsigned char *nr_slots) 277 { 278 struct msdos_dir_slot *ds; 279 unsigned char id, slot, slots, alias_checksum; 280 281 if (!*unicode) { 282 *unicode = __getname(); 283 if (!*unicode) { 284 brelse(*bh); 285 return -ENOMEM; 286 } 287 } 288 parse_long: 289 slots = 0; 290 ds = (struct msdos_dir_slot *)*de; 291 id = ds->id; 292 if (!(id & 0x40)) 293 return PARSE_INVALID; 294 slots = id & ~0x40; 295 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ 296 return PARSE_INVALID; 297 *nr_slots = slots; 298 alias_checksum = ds->alias_checksum; 299 300 slot = slots; 301 while (1) { 302 int offset; 303 304 slot--; 305 offset = slot * 13; 306 fat16_towchar(*unicode + offset, ds->name0_4, 5); 307 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); 308 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); 309 310 if (ds->id & 0x40) 311 (*unicode)[offset + 13] = 0; 312 if (fat_get_entry(dir, pos, bh, de) < 0) 313 return PARSE_EOF; 314 if (slot == 0) 315 break; 316 ds = (struct msdos_dir_slot *)*de; 317 if (ds->attr != ATTR_EXT) 318 return PARSE_NOT_LONGNAME; 319 if ((ds->id & ~0x40) != slot) 320 goto parse_long; 321 if (ds->alias_checksum != alias_checksum) 322 goto parse_long; 323 } 324 if ((*de)->name[0] == DELETED_FLAG) 325 return PARSE_INVALID; 326 if ((*de)->attr == ATTR_EXT) 327 goto parse_long; 328 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) 329 return PARSE_INVALID; 330 if (fat_checksum((*de)->name) != alias_checksum) 331 *nr_slots = 0; 332 333 return 0; 334 } 335 336 /* 337 * Return values: negative -> error, 0 -> not found, positive -> found, 338 * value is the total amount of slots, including the shortname entry. 339 */ 340 int fat_search_long(struct inode *inode, const unsigned char *name, 341 int name_len, struct fat_slot_info *sinfo) 342 { 343 struct super_block *sb = inode->i_sb; 344 struct msdos_sb_info *sbi = MSDOS_SB(sb); 345 struct buffer_head *bh = NULL; 346 struct msdos_dir_entry *de; 347 struct nls_table *nls_disk = sbi->nls_disk; 348 unsigned char nr_slots; 349 wchar_t bufuname[14]; 350 wchar_t *unicode = NULL; 351 unsigned char work[MSDOS_NAME]; 352 unsigned char bufname[FAT_MAX_SHORT_SIZE]; 353 unsigned short opt_shortname = sbi->options.shortname; 354 loff_t cpos = 0; 355 int chl, i, j, last_u, err, len; 356 357 err = -ENOENT; 358 while (1) { 359 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 360 goto end_of_dir; 361 parse_record: 362 nr_slots = 0; 363 if (de->name[0] == DELETED_FLAG) 364 continue; 365 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 366 continue; 367 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 368 continue; 369 if (de->attr == ATTR_EXT) { 370 int status = fat_parse_long(inode, &cpos, &bh, &de, 371 &unicode, &nr_slots); 372 if (status < 0) { 373 err = status; 374 goto end_of_dir; 375 } else if (status == PARSE_INVALID) 376 continue; 377 else if (status == PARSE_NOT_LONGNAME) 378 goto parse_record; 379 else if (status == PARSE_EOF) 380 goto end_of_dir; 381 } 382 383 memcpy(work, de->name, sizeof(de->name)); 384 /* see namei.c, msdos_format_name */ 385 if (work[0] == 0x05) 386 work[0] = 0xE5; 387 for (i = 0, j = 0, last_u = 0; i < 8;) { 388 if (!work[i]) 389 break; 390 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 391 &bufuname[j++], opt_shortname, 392 de->lcase & CASE_LOWER_BASE); 393 if (chl <= 1) { 394 if (work[i] != ' ') 395 last_u = j; 396 } else { 397 last_u = j; 398 } 399 i += chl; 400 } 401 j = last_u; 402 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); 403 for (i = 8; i < MSDOS_NAME;) { 404 if (!work[i]) 405 break; 406 chl = fat_shortname2uni(nls_disk, &work[i], 407 MSDOS_NAME - i, 408 &bufuname[j++], opt_shortname, 409 de->lcase & CASE_LOWER_EXT); 410 if (chl <= 1) { 411 if (work[i] != ' ') 412 last_u = j; 413 } else { 414 last_u = j; 415 } 416 i += chl; 417 } 418 if (!last_u) 419 continue; 420 421 /* Compare shortname */ 422 bufuname[last_u] = 0x0000; 423 len = fat_uni_to_x8(sb, bufuname, bufname, sizeof(bufname)); 424 if (fat_name_match(sbi, name, name_len, bufname, len)) 425 goto found; 426 427 if (nr_slots) { 428 void *longname = unicode + FAT_MAX_UNI_CHARS; 429 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 430 431 /* Compare longname */ 432 len = fat_uni_to_x8(sb, unicode, longname, size); 433 if (fat_name_match(sbi, name, name_len, longname, len)) 434 goto found; 435 } 436 } 437 438 found: 439 nr_slots++; /* include the de */ 440 sinfo->slot_off = cpos - nr_slots * sizeof(*de); 441 sinfo->nr_slots = nr_slots; 442 sinfo->de = de; 443 sinfo->bh = bh; 444 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 445 err = 0; 446 end_of_dir: 447 if (unicode) 448 __putname(unicode); 449 450 return err; 451 } 452 453 EXPORT_SYMBOL_GPL(fat_search_long); 454 455 struct fat_ioctl_filldir_callback { 456 void __user *dirent; 457 int result; 458 /* for dir ioctl */ 459 const char *longname; 460 int long_len; 461 const char *shortname; 462 int short_len; 463 }; 464 465 static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, 466 filldir_t filldir, int short_only, int both) 467 { 468 struct super_block *sb = inode->i_sb; 469 struct msdos_sb_info *sbi = MSDOS_SB(sb); 470 struct buffer_head *bh; 471 struct msdos_dir_entry *de; 472 struct nls_table *nls_disk = sbi->nls_disk; 473 unsigned char nr_slots; 474 wchar_t bufuname[14]; 475 wchar_t *unicode = NULL; 476 unsigned char c, work[MSDOS_NAME]; 477 unsigned char bufname[FAT_MAX_SHORT_SIZE], *ptname = bufname; 478 unsigned short opt_shortname = sbi->options.shortname; 479 int isvfat = sbi->options.isvfat; 480 int nocase = sbi->options.nocase; 481 const char *fill_name = NULL; 482 unsigned long inum; 483 unsigned long lpos, dummy, *furrfu = &lpos; 484 loff_t cpos; 485 int chi, chl, i, i2, j, last, last_u, dotoffset = 0, fill_len = 0; 486 int ret = 0; 487 488 lock_super(sb); 489 490 cpos = filp->f_pos; 491 /* Fake . and .. for the root directory. */ 492 if (inode->i_ino == MSDOS_ROOT_INO) { 493 while (cpos < 2) { 494 if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0) 495 goto out; 496 cpos++; 497 filp->f_pos++; 498 } 499 if (cpos == 2) { 500 dummy = 2; 501 furrfu = &dummy; 502 cpos = 0; 503 } 504 } 505 if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { 506 ret = -ENOENT; 507 goto out; 508 } 509 510 bh = NULL; 511 get_new: 512 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 513 goto end_of_dir; 514 parse_record: 515 nr_slots = 0; 516 /* 517 * Check for long filename entry, but if short_only, we don't 518 * need to parse long filename. 519 */ 520 if (isvfat && !short_only) { 521 if (de->name[0] == DELETED_FLAG) 522 goto record_end; 523 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 524 goto record_end; 525 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 526 goto record_end; 527 } else { 528 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) 529 goto record_end; 530 } 531 532 if (isvfat && de->attr == ATTR_EXT) { 533 int status = fat_parse_long(inode, &cpos, &bh, &de, 534 &unicode, &nr_slots); 535 if (status < 0) { 536 filp->f_pos = cpos; 537 ret = status; 538 goto out; 539 } else if (status == PARSE_INVALID) 540 goto record_end; 541 else if (status == PARSE_NOT_LONGNAME) 542 goto parse_record; 543 else if (status == PARSE_EOF) 544 goto end_of_dir; 545 546 if (nr_slots) { 547 void *longname = unicode + FAT_MAX_UNI_CHARS; 548 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 549 int len = fat_uni_to_x8(sb, unicode, longname, size); 550 551 fill_name = longname; 552 fill_len = len; 553 /* !both && !short_only, so we don't need shortname. */ 554 if (!both) 555 goto start_filldir; 556 } 557 } 558 559 if (sbi->options.dotsOK) { 560 ptname = bufname; 561 dotoffset = 0; 562 if (de->attr & ATTR_HIDDEN) { 563 *ptname++ = '.'; 564 dotoffset = 1; 565 } 566 } 567 568 memcpy(work, de->name, sizeof(de->name)); 569 /* see namei.c, msdos_format_name */ 570 if (work[0] == 0x05) 571 work[0] = 0xE5; 572 for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) { 573 if (!(c = work[i])) 574 break; 575 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 576 &bufuname[j++], opt_shortname, 577 de->lcase & CASE_LOWER_BASE); 578 if (chl <= 1) { 579 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; 580 if (c != ' ') { 581 last = i; 582 last_u = j; 583 } 584 } else { 585 last_u = j; 586 for (chi = 0; chi < chl && i < 8; chi++) { 587 ptname[i] = work[i]; 588 i++; last = i; 589 } 590 } 591 } 592 i = last; 593 j = last_u; 594 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); 595 ptname[i++] = '.'; 596 for (i2 = 8; i2 < MSDOS_NAME;) { 597 if (!(c = work[i2])) 598 break; 599 chl = fat_shortname2uni(nls_disk, &work[i2], MSDOS_NAME - i2, 600 &bufuname[j++], opt_shortname, 601 de->lcase & CASE_LOWER_EXT); 602 if (chl <= 1) { 603 i2++; 604 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; 605 if (c != ' ') { 606 last = i; 607 last_u = j; 608 } 609 } else { 610 last_u = j; 611 for (chi = 0; chi < chl && i2 < MSDOS_NAME; chi++) { 612 ptname[i++] = work[i2++]; 613 last = i; 614 } 615 } 616 } 617 if (!last) 618 goto record_end; 619 620 i = last + dotoffset; 621 j = last_u; 622 623 if (isvfat) { 624 bufuname[j] = 0x0000; 625 i = fat_uni_to_x8(sb, bufuname, bufname, sizeof(bufname)); 626 } 627 if (nr_slots) { 628 /* hack for fat_ioctl_filldir() */ 629 struct fat_ioctl_filldir_callback *p = dirent; 630 631 p->longname = fill_name; 632 p->long_len = fill_len; 633 p->shortname = bufname; 634 p->short_len = i; 635 fill_name = NULL; 636 fill_len = 0; 637 } else { 638 fill_name = bufname; 639 fill_len = i; 640 } 641 642 start_filldir: 643 lpos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); 644 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) 645 inum = inode->i_ino; 646 else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 647 inum = parent_ino(filp->f_path.dentry); 648 } else { 649 loff_t i_pos = fat_make_i_pos(sb, bh, de); 650 struct inode *tmp = fat_iget(sb, i_pos); 651 if (tmp) { 652 inum = tmp->i_ino; 653 iput(tmp); 654 } else 655 inum = iunique(sb, MSDOS_ROOT_INO); 656 } 657 658 if (filldir(dirent, fill_name, fill_len, *furrfu, inum, 659 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0) 660 goto fill_failed; 661 662 record_end: 663 furrfu = &lpos; 664 filp->f_pos = cpos; 665 goto get_new; 666 end_of_dir: 667 filp->f_pos = cpos; 668 fill_failed: 669 brelse(bh); 670 if (unicode) 671 __putname(unicode); 672 out: 673 unlock_super(sb); 674 return ret; 675 } 676 677 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir) 678 { 679 struct inode *inode = filp->f_path.dentry->d_inode; 680 return __fat_readdir(inode, filp, dirent, filldir, 0, 0); 681 } 682 683 #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ 684 static int func(void *__buf, const char *name, int name_len, \ 685 loff_t offset, u64 ino, unsigned int d_type) \ 686 { \ 687 struct fat_ioctl_filldir_callback *buf = __buf; \ 688 struct dirent_type __user *d1 = buf->dirent; \ 689 struct dirent_type __user *d2 = d1 + 1; \ 690 \ 691 if (buf->result) \ 692 return -EINVAL; \ 693 buf->result++; \ 694 \ 695 if (name != NULL) { \ 696 /* dirent has only short name */ \ 697 if (name_len >= sizeof(d1->d_name)) \ 698 name_len = sizeof(d1->d_name) - 1; \ 699 \ 700 if (put_user(0, d2->d_name) || \ 701 put_user(0, &d2->d_reclen) || \ 702 copy_to_user(d1->d_name, name, name_len) || \ 703 put_user(0, d1->d_name + name_len) || \ 704 put_user(name_len, &d1->d_reclen)) \ 705 goto efault; \ 706 } else { \ 707 /* dirent has short and long name */ \ 708 const char *longname = buf->longname; \ 709 int long_len = buf->long_len; \ 710 const char *shortname = buf->shortname; \ 711 int short_len = buf->short_len; \ 712 \ 713 if (long_len >= sizeof(d1->d_name)) \ 714 long_len = sizeof(d1->d_name) - 1; \ 715 if (short_len >= sizeof(d1->d_name)) \ 716 short_len = sizeof(d1->d_name) - 1; \ 717 \ 718 if (copy_to_user(d2->d_name, longname, long_len) || \ 719 put_user(0, d2->d_name + long_len) || \ 720 put_user(long_len, &d2->d_reclen) || \ 721 put_user(ino, &d2->d_ino) || \ 722 put_user(offset, &d2->d_off) || \ 723 copy_to_user(d1->d_name, shortname, short_len) || \ 724 put_user(0, d1->d_name + short_len) || \ 725 put_user(short_len, &d1->d_reclen)) \ 726 goto efault; \ 727 } \ 728 return 0; \ 729 efault: \ 730 buf->result = -EFAULT; \ 731 return -EFAULT; \ 732 } 733 734 FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) 735 736 static int fat_ioctl_readdir(struct inode *inode, struct file *filp, 737 void __user *dirent, filldir_t filldir, 738 int short_only, int both) 739 { 740 struct fat_ioctl_filldir_callback buf; 741 int ret; 742 743 buf.dirent = dirent; 744 buf.result = 0; 745 mutex_lock(&inode->i_mutex); 746 ret = -ENOENT; 747 if (!IS_DEADDIR(inode)) { 748 ret = __fat_readdir(inode, filp, &buf, filldir, 749 short_only, both); 750 } 751 mutex_unlock(&inode->i_mutex); 752 if (ret >= 0) 753 ret = buf.result; 754 return ret; 755 } 756 757 static long fat_dir_ioctl(struct file *filp, unsigned int cmd, 758 unsigned long arg) 759 { 760 struct inode *inode = filp->f_path.dentry->d_inode; 761 struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; 762 int short_only, both; 763 764 switch (cmd) { 765 case VFAT_IOCTL_READDIR_SHORT: 766 short_only = 1; 767 both = 0; 768 break; 769 case VFAT_IOCTL_READDIR_BOTH: 770 short_only = 0; 771 both = 1; 772 break; 773 default: 774 return fat_generic_ioctl(filp, cmd, arg); 775 } 776 777 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2]))) 778 return -EFAULT; 779 /* 780 * Yes, we don't need this put_user() absolutely. However old 781 * code didn't return the right value. So, app use this value, 782 * in order to check whether it is EOF. 783 */ 784 if (put_user(0, &d1->d_reclen)) 785 return -EFAULT; 786 787 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, 788 short_only, both); 789 } 790 791 #ifdef CONFIG_COMPAT 792 #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) 793 #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) 794 795 FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) 796 797 static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, 798 unsigned long arg) 799 { 800 struct inode *inode = filp->f_path.dentry->d_inode; 801 struct compat_dirent __user *d1 = compat_ptr(arg); 802 int short_only, both; 803 804 switch (cmd) { 805 case VFAT_IOCTL_READDIR_SHORT32: 806 short_only = 1; 807 both = 0; 808 break; 809 case VFAT_IOCTL_READDIR_BOTH32: 810 short_only = 0; 811 both = 1; 812 break; 813 default: 814 return fat_generic_ioctl(filp, cmd, (unsigned long)arg); 815 } 816 817 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) 818 return -EFAULT; 819 /* 820 * Yes, we don't need this put_user() absolutely. However old 821 * code didn't return the right value. So, app use this value, 822 * in order to check whether it is EOF. 823 */ 824 if (put_user(0, &d1->d_reclen)) 825 return -EFAULT; 826 827 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, 828 short_only, both); 829 } 830 #endif /* CONFIG_COMPAT */ 831 832 const struct file_operations fat_dir_operations = { 833 .llseek = generic_file_llseek, 834 .read = generic_read_dir, 835 .readdir = fat_readdir, 836 .unlocked_ioctl = fat_dir_ioctl, 837 #ifdef CONFIG_COMPAT 838 .compat_ioctl = fat_compat_dir_ioctl, 839 #endif 840 .fsync = fat_file_fsync, 841 }; 842 843 static int fat_get_short_entry(struct inode *dir, loff_t *pos, 844 struct buffer_head **bh, 845 struct msdos_dir_entry **de) 846 { 847 while (fat_get_entry(dir, pos, bh, de) >= 0) { 848 /* free entry or long name entry or volume label */ 849 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) 850 return 0; 851 } 852 return -ENOENT; 853 } 854 855 /* 856 * The ".." entry can not provide the "struct fat_slot_info" informations 857 * for inode. So, this function provide the some informations only. 858 */ 859 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, 860 struct msdos_dir_entry **de, loff_t *i_pos) 861 { 862 loff_t offset; 863 864 offset = 0; 865 *bh = NULL; 866 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { 867 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) { 868 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de); 869 return 0; 870 } 871 } 872 return -ENOENT; 873 } 874 875 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); 876 877 /* See if directory is empty */ 878 int fat_dir_empty(struct inode *dir) 879 { 880 struct buffer_head *bh; 881 struct msdos_dir_entry *de; 882 loff_t cpos; 883 int result = 0; 884 885 bh = NULL; 886 cpos = 0; 887 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 888 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && 889 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 890 result = -ENOTEMPTY; 891 break; 892 } 893 } 894 brelse(bh); 895 return result; 896 } 897 898 EXPORT_SYMBOL_GPL(fat_dir_empty); 899 900 /* 901 * fat_subdirs counts the number of sub-directories of dir. It can be run 902 * on directories being created. 903 */ 904 int fat_subdirs(struct inode *dir) 905 { 906 struct buffer_head *bh; 907 struct msdos_dir_entry *de; 908 loff_t cpos; 909 int count = 0; 910 911 bh = NULL; 912 cpos = 0; 913 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 914 if (de->attr & ATTR_DIR) 915 count++; 916 } 917 brelse(bh); 918 return count; 919 } 920 921 /* 922 * Scans a directory for a given file (name points to its formatted name). 923 * Returns an error code or zero. 924 */ 925 int fat_scan(struct inode *dir, const unsigned char *name, 926 struct fat_slot_info *sinfo) 927 { 928 struct super_block *sb = dir->i_sb; 929 930 sinfo->slot_off = 0; 931 sinfo->bh = NULL; 932 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 933 &sinfo->de) >= 0) { 934 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { 935 sinfo->slot_off -= sizeof(*sinfo->de); 936 sinfo->nr_slots = 1; 937 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 938 return 0; 939 } 940 } 941 return -ENOENT; 942 } 943 944 EXPORT_SYMBOL_GPL(fat_scan); 945 946 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) 947 { 948 struct super_block *sb = dir->i_sb; 949 struct buffer_head *bh; 950 struct msdos_dir_entry *de, *endp; 951 int err = 0, orig_slots; 952 953 while (nr_slots) { 954 bh = NULL; 955 if (fat_get_entry(dir, &pos, &bh, &de) < 0) { 956 err = -EIO; 957 break; 958 } 959 960 orig_slots = nr_slots; 961 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); 962 while (nr_slots && de < endp) { 963 de->name[0] = DELETED_FLAG; 964 de++; 965 nr_slots--; 966 } 967 mark_buffer_dirty_inode(bh, dir); 968 if (IS_DIRSYNC(dir)) 969 err = sync_dirty_buffer(bh); 970 brelse(bh); 971 if (err) 972 break; 973 974 /* pos is *next* de's position, so this does `- sizeof(de)' */ 975 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); 976 } 977 978 return err; 979 } 980 981 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) 982 { 983 struct super_block *sb = dir->i_sb; 984 struct msdos_dir_entry *de; 985 struct buffer_head *bh; 986 int err = 0, nr_slots; 987 988 /* 989 * First stage: Remove the shortname. By this, the directory 990 * entry is removed. 991 */ 992 nr_slots = sinfo->nr_slots; 993 de = sinfo->de; 994 sinfo->de = NULL; 995 bh = sinfo->bh; 996 sinfo->bh = NULL; 997 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { 998 de->name[0] = DELETED_FLAG; 999 de--; 1000 nr_slots--; 1001 } 1002 mark_buffer_dirty_inode(bh, dir); 1003 if (IS_DIRSYNC(dir)) 1004 err = sync_dirty_buffer(bh); 1005 brelse(bh); 1006 if (err) 1007 return err; 1008 dir->i_version++; 1009 1010 if (nr_slots) { 1011 /* 1012 * Second stage: remove the remaining longname slots. 1013 * (This directory entry is already removed, and so return 1014 * the success) 1015 */ 1016 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); 1017 if (err) { 1018 fat_msg(sb, KERN_WARNING, 1019 "Couldn't remove the long name slots"); 1020 } 1021 } 1022 1023 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; 1024 if (IS_DIRSYNC(dir)) 1025 (void)fat_sync_inode(dir); 1026 else 1027 mark_inode_dirty(dir); 1028 1029 return 0; 1030 } 1031 1032 EXPORT_SYMBOL_GPL(fat_remove_entries); 1033 1034 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, 1035 struct buffer_head **bhs, int nr_bhs) 1036 { 1037 struct super_block *sb = dir->i_sb; 1038 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; 1039 int err, i, n; 1040 1041 /* Zeroing the unused blocks on this cluster */ 1042 blknr += nr_used; 1043 n = nr_used; 1044 while (blknr < last_blknr) { 1045 bhs[n] = sb_getblk(sb, blknr); 1046 if (!bhs[n]) { 1047 err = -ENOMEM; 1048 goto error; 1049 } 1050 memset(bhs[n]->b_data, 0, sb->s_blocksize); 1051 set_buffer_uptodate(bhs[n]); 1052 mark_buffer_dirty_inode(bhs[n], dir); 1053 1054 n++; 1055 blknr++; 1056 if (n == nr_bhs) { 1057 if (IS_DIRSYNC(dir)) { 1058 err = fat_sync_bhs(bhs, n); 1059 if (err) 1060 goto error; 1061 } 1062 for (i = 0; i < n; i++) 1063 brelse(bhs[i]); 1064 n = 0; 1065 } 1066 } 1067 if (IS_DIRSYNC(dir)) { 1068 err = fat_sync_bhs(bhs, n); 1069 if (err) 1070 goto error; 1071 } 1072 for (i = 0; i < n; i++) 1073 brelse(bhs[i]); 1074 1075 return 0; 1076 1077 error: 1078 for (i = 0; i < n; i++) 1079 bforget(bhs[i]); 1080 return err; 1081 } 1082 1083 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) 1084 { 1085 struct super_block *sb = dir->i_sb; 1086 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1087 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1088 struct msdos_dir_entry *de; 1089 sector_t blknr; 1090 __le16 date, time; 1091 u8 time_cs; 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_time_unix2fat(sbi, ts, &time, &date, &time_cs); 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 if (sbi->options.isvfat) { 1116 /* extra timestamps */ 1117 de[0].ctime = de[1].ctime = time; 1118 de[0].ctime_cs = de[1].ctime_cs = time_cs; 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].ctime_cs = de[1].ctime_cs = 0; 1123 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; 1124 } 1125 de[0].start = cpu_to_le16(cluster); 1126 de[0].starthi = cpu_to_le16(cluster >> 16); 1127 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart); 1128 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16); 1129 de[0].size = de[1].size = 0; 1130 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); 1131 set_buffer_uptodate(bhs[0]); 1132 mark_buffer_dirty_inode(bhs[0], dir); 1133 1134 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); 1135 if (err) 1136 goto error_free; 1137 1138 return cluster; 1139 1140 error_free: 1141 fat_free_clusters(dir, cluster); 1142 error: 1143 return err; 1144 } 1145 1146 EXPORT_SYMBOL_GPL(fat_alloc_new_dir); 1147 1148 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, 1149 int *nr_cluster, struct msdos_dir_entry **de, 1150 struct buffer_head **bh, loff_t *i_pos) 1151 { 1152 struct super_block *sb = dir->i_sb; 1153 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1154 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1155 sector_t blknr, start_blknr, last_blknr; 1156 unsigned long size, copy; 1157 int err, i, n, offset, cluster[2]; 1158 1159 /* 1160 * The minimum cluster size is 512bytes, and maximum entry 1161 * size is 32*slots (672bytes). So, iff the cluster size is 1162 * 512bytes, we may need two clusters. 1163 */ 1164 size = nr_slots * sizeof(struct msdos_dir_entry); 1165 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; 1166 BUG_ON(*nr_cluster > 2); 1167 1168 err = fat_alloc_clusters(dir, cluster, *nr_cluster); 1169 if (err) 1170 goto error; 1171 1172 /* 1173 * First stage: Fill the directory entry. NOTE: This cluster 1174 * is not referenced from any inode yet, so updates order is 1175 * not important. 1176 */ 1177 i = n = copy = 0; 1178 do { 1179 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); 1180 last_blknr = start_blknr + sbi->sec_per_clus; 1181 while (blknr < last_blknr) { 1182 bhs[n] = sb_getblk(sb, blknr); 1183 if (!bhs[n]) { 1184 err = -ENOMEM; 1185 goto error_nomem; 1186 } 1187 1188 /* fill the directory entry */ 1189 copy = min(size, sb->s_blocksize); 1190 memcpy(bhs[n]->b_data, slots, copy); 1191 slots += copy; 1192 size -= copy; 1193 set_buffer_uptodate(bhs[n]); 1194 mark_buffer_dirty_inode(bhs[n], dir); 1195 if (!size) 1196 break; 1197 n++; 1198 blknr++; 1199 } 1200 } while (++i < *nr_cluster); 1201 1202 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); 1203 offset = copy - sizeof(struct msdos_dir_entry); 1204 get_bh(bhs[n]); 1205 *bh = bhs[n]; 1206 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 1207 *i_pos = fat_make_i_pos(sb, *bh, *de); 1208 1209 /* Second stage: clear the rest of cluster, and write outs */ 1210 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); 1211 if (err) 1212 goto error_free; 1213 1214 return cluster[0]; 1215 1216 error_free: 1217 brelse(*bh); 1218 *bh = NULL; 1219 n = 0; 1220 error_nomem: 1221 for (i = 0; i < n; i++) 1222 bforget(bhs[i]); 1223 fat_free_clusters(dir, cluster[0]); 1224 error: 1225 return err; 1226 } 1227 1228 int fat_add_entries(struct inode *dir, void *slots, int nr_slots, 1229 struct fat_slot_info *sinfo) 1230 { 1231 struct super_block *sb = dir->i_sb; 1232 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1233 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ 1234 struct msdos_dir_entry *uninitialized_var(de); 1235 int err, free_slots, i, nr_bhs; 1236 loff_t pos, i_pos; 1237 1238 sinfo->nr_slots = nr_slots; 1239 1240 /* First stage: search free direcotry entries */ 1241 free_slots = nr_bhs = 0; 1242 bh = prev = NULL; 1243 pos = 0; 1244 err = -ENOSPC; 1245 while (fat_get_entry(dir, &pos, &bh, &de) > -1) { 1246 /* check the maximum size of directory */ 1247 if (pos >= FAT_MAX_DIR_SIZE) 1248 goto error; 1249 1250 if (IS_FREE(de->name)) { 1251 if (prev != bh) { 1252 get_bh(bh); 1253 bhs[nr_bhs] = prev = bh; 1254 nr_bhs++; 1255 } 1256 free_slots++; 1257 if (free_slots == nr_slots) 1258 goto found; 1259 } else { 1260 for (i = 0; i < nr_bhs; i++) 1261 brelse(bhs[i]); 1262 prev = NULL; 1263 free_slots = nr_bhs = 0; 1264 } 1265 } 1266 if (dir->i_ino == MSDOS_ROOT_INO) { 1267 if (sbi->fat_bits != 32) 1268 goto error; 1269 } else if (MSDOS_I(dir)->i_start == 0) { 1270 fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)", 1271 MSDOS_I(dir)->i_pos); 1272 err = -EIO; 1273 goto error; 1274 } 1275 1276 found: 1277 err = 0; 1278 pos -= free_slots * sizeof(*de); 1279 nr_slots -= free_slots; 1280 if (free_slots) { 1281 /* 1282 * Second stage: filling the free entries with new entries. 1283 * NOTE: If this slots has shortname, first, we write 1284 * the long name slots, then write the short name. 1285 */ 1286 int size = free_slots * sizeof(*de); 1287 int offset = pos & (sb->s_blocksize - 1); 1288 int long_bhs = nr_bhs - (nr_slots == 0); 1289 1290 /* Fill the long name slots. */ 1291 for (i = 0; i < long_bhs; i++) { 1292 int copy = min_t(int, sb->s_blocksize - offset, size); 1293 memcpy(bhs[i]->b_data + offset, slots, copy); 1294 mark_buffer_dirty_inode(bhs[i], dir); 1295 offset = 0; 1296 slots += copy; 1297 size -= copy; 1298 } 1299 if (long_bhs && IS_DIRSYNC(dir)) 1300 err = fat_sync_bhs(bhs, long_bhs); 1301 if (!err && i < nr_bhs) { 1302 /* Fill the short name slot. */ 1303 int copy = min_t(int, sb->s_blocksize - offset, size); 1304 memcpy(bhs[i]->b_data + offset, slots, copy); 1305 mark_buffer_dirty_inode(bhs[i], dir); 1306 if (IS_DIRSYNC(dir)) 1307 err = sync_dirty_buffer(bhs[i]); 1308 } 1309 for (i = 0; i < nr_bhs; i++) 1310 brelse(bhs[i]); 1311 if (err) 1312 goto error_remove; 1313 } 1314 1315 if (nr_slots) { 1316 int cluster, nr_cluster; 1317 1318 /* 1319 * Third stage: allocate the cluster for new entries. 1320 * And initialize the cluster with new entries, then 1321 * add the cluster to dir. 1322 */ 1323 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, 1324 &de, &bh, &i_pos); 1325 if (cluster < 0) { 1326 err = cluster; 1327 goto error_remove; 1328 } 1329 err = fat_chain_add(dir, cluster, nr_cluster); 1330 if (err) { 1331 fat_free_clusters(dir, cluster); 1332 goto error_remove; 1333 } 1334 if (dir->i_size & (sbi->cluster_size - 1)) { 1335 fat_fs_error(sb, "Odd directory size"); 1336 dir->i_size = (dir->i_size + sbi->cluster_size - 1) 1337 & ~((loff_t)sbi->cluster_size - 1); 1338 } 1339 dir->i_size += nr_cluster << sbi->cluster_bits; 1340 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; 1341 } 1342 sinfo->slot_off = pos; 1343 sinfo->de = de; 1344 sinfo->bh = bh; 1345 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 1346 1347 return 0; 1348 1349 error: 1350 brelse(bh); 1351 for (i = 0; i < nr_bhs; i++) 1352 brelse(bhs[i]); 1353 return err; 1354 1355 error_remove: 1356 brelse(bh); 1357 if (free_slots) 1358 __fat_remove_entries(dir, pos, free_slots); 1359 return err; 1360 } 1361 1362 EXPORT_SYMBOL_GPL(fat_add_entries); 1363