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 <linux/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 unsigned char fat_tolower(unsigned char c) 39 { 40 return ((c >= 'A') && (c <= 'Z')) ? c+32 : c; 41 } 42 43 static inline loff_t fat_make_i_pos(struct super_block *sb, 44 struct buffer_head *bh, 45 struct msdos_dir_entry *de) 46 { 47 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) 48 | (de - (struct msdos_dir_entry *)bh->b_data); 49 } 50 51 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, 52 sector_t phys) 53 { 54 struct super_block *sb = dir->i_sb; 55 struct msdos_sb_info *sbi = MSDOS_SB(sb); 56 struct buffer_head *bh; 57 int sec; 58 59 /* This is not a first sector of cluster, or sec_per_clus == 1 */ 60 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) 61 return; 62 /* root dir of FAT12/FAT16 */ 63 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) 64 return; 65 66 bh = sb_find_get_block(sb, phys); 67 if (bh == NULL || !buffer_uptodate(bh)) { 68 for (sec = 0; sec < sbi->sec_per_clus; sec++) 69 sb_breadahead(sb, phys + sec); 70 } 71 brelse(bh); 72 } 73 74 /* Returns the inode number of the directory entry at offset pos. If bh is 75 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is 76 returned in bh. 77 AV. Most often we do it item-by-item. Makes sense to optimize. 78 AV. OK, there we go: if both bh and de are non-NULL we assume that we just 79 AV. want the next entry (took one explicit de=NULL in vfat/namei.c). 80 AV. It's done in fat_get_entry() (inlined), here the slow case lives. 81 AV. Additionally, when we return -1 (i.e. reached the end of directory) 82 AV. we make bh NULL. 83 */ 84 static int fat__get_entry(struct inode *dir, loff_t *pos, 85 struct buffer_head **bh, struct msdos_dir_entry **de) 86 { 87 struct super_block *sb = dir->i_sb; 88 sector_t phys, iblock; 89 unsigned long mapped_blocks; 90 int err, offset; 91 92 next: 93 if (*bh) 94 brelse(*bh); 95 96 *bh = NULL; 97 iblock = *pos >> sb->s_blocksize_bits; 98 err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0); 99 if (err || !phys) 100 return -1; /* beyond EOF or error */ 101 102 fat_dir_readahead(dir, iblock, phys); 103 104 *bh = sb_bread(sb, phys); 105 if (*bh == NULL) { 106 fat_msg_ratelimit(sb, KERN_ERR, 107 "Directory bread(block %llu) failed", (llu)phys); 108 /* skip this block */ 109 *pos = (iblock + 1) << sb->s_blocksize_bits; 110 goto next; 111 } 112 113 offset = *pos & (sb->s_blocksize - 1); 114 *pos += sizeof(struct msdos_dir_entry); 115 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 116 117 return 0; 118 } 119 120 static inline int fat_get_entry(struct inode *dir, loff_t *pos, 121 struct buffer_head **bh, 122 struct msdos_dir_entry **de) 123 { 124 /* Fast stuff first */ 125 if (*bh && *de && 126 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < 127 MSDOS_SB(dir->i_sb)->dir_per_block - 1) { 128 *pos += sizeof(struct msdos_dir_entry); 129 (*de)++; 130 return 0; 131 } 132 return fat__get_entry(dir, pos, bh, de); 133 } 134 135 /* 136 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. 137 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a 138 * colon as an escape character since it is normally invalid on the vfat 139 * filesystem. The following four characters are the hexadecimal digits 140 * of Unicode value. This lets us do a full dump and restore of Unicode 141 * filenames. We could get into some trouble with long Unicode names, 142 * but ignore that right now. 143 * Ahem... Stack smashing in ring 0 isn't fun. Fixed. 144 */ 145 static int uni16_to_x8(struct super_block *sb, unsigned char *ascii, 146 const wchar_t *uni, int len, struct nls_table *nls) 147 { 148 int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate; 149 const wchar_t *ip; 150 wchar_t ec; 151 unsigned char *op; 152 int charlen; 153 154 ip = uni; 155 op = ascii; 156 157 while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { 158 ec = *ip++; 159 charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE); 160 if (charlen > 0) { 161 op += charlen; 162 len -= charlen; 163 } else { 164 if (uni_xlate == 1) { 165 *op++ = ':'; 166 op = hex_byte_pack(op, ec >> 8); 167 op = hex_byte_pack(op, ec); 168 len -= 5; 169 } else { 170 *op++ = '?'; 171 len--; 172 } 173 } 174 } 175 176 if (unlikely(*ip)) { 177 fat_msg(sb, KERN_WARNING, 178 "filename was truncated while converting."); 179 } 180 181 *op = 0; 182 return op - ascii; 183 } 184 185 static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni, 186 unsigned char *buf, int size) 187 { 188 struct msdos_sb_info *sbi = MSDOS_SB(sb); 189 if (sbi->options.utf8) 190 return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS, 191 UTF16_HOST_ENDIAN, buf, size); 192 else 193 return uni16_to_x8(sb, buf, uni, size, sbi->nls_io); 194 } 195 196 static inline int 197 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) 198 { 199 int charlen; 200 201 charlen = t->char2uni(c, clen, uni); 202 if (charlen < 0) { 203 *uni = 0x003f; /* a question mark */ 204 charlen = 1; 205 } 206 return charlen; 207 } 208 209 static inline int 210 fat_short2lower_uni(struct nls_table *t, unsigned char *c, 211 int clen, wchar_t *uni) 212 { 213 int charlen; 214 wchar_t wc; 215 216 charlen = t->char2uni(c, clen, &wc); 217 if (charlen < 0) { 218 *uni = 0x003f; /* a question mark */ 219 charlen = 1; 220 } else if (charlen <= 1) { 221 unsigned char nc = t->charset2lower[*c]; 222 223 if (!nc) 224 nc = *c; 225 226 charlen = t->char2uni(&nc, 1, uni); 227 if (charlen < 0) { 228 *uni = 0x003f; /* a question mark */ 229 charlen = 1; 230 } 231 } else 232 *uni = wc; 233 234 return charlen; 235 } 236 237 static inline int 238 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, 239 wchar_t *uni_buf, unsigned short opt, int lower) 240 { 241 int len = 0; 242 243 if (opt & VFAT_SFN_DISPLAY_LOWER) 244 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 245 else if (opt & VFAT_SFN_DISPLAY_WIN95) 246 len = fat_short2uni(nls, buf, buf_size, uni_buf); 247 else if (opt & VFAT_SFN_DISPLAY_WINNT) { 248 if (lower) 249 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); 250 else 251 len = fat_short2uni(nls, buf, buf_size, uni_buf); 252 } else 253 len = fat_short2uni(nls, buf, buf_size, uni_buf); 254 255 return len; 256 } 257 258 static inline int fat_name_match(struct msdos_sb_info *sbi, 259 const unsigned char *a, int a_len, 260 const unsigned char *b, int b_len) 261 { 262 if (a_len != b_len) 263 return 0; 264 265 if (sbi->options.name_check != 's') 266 return !nls_strnicmp(sbi->nls_io, a, b, a_len); 267 else 268 return !memcmp(a, b, a_len); 269 } 270 271 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; 272 273 /** 274 * fat_parse_long - Parse extended directory entry. 275 * 276 * This function returns zero on success, negative value on error, or one of 277 * the following: 278 * 279 * %PARSE_INVALID - Directory entry is invalid. 280 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. 281 * %PARSE_EOF - Directory has no more entries. 282 */ 283 static int fat_parse_long(struct inode *dir, loff_t *pos, 284 struct buffer_head **bh, struct msdos_dir_entry **de, 285 wchar_t **unicode, unsigned char *nr_slots) 286 { 287 struct msdos_dir_slot *ds; 288 unsigned char id, slot, slots, alias_checksum; 289 290 if (!*unicode) { 291 *unicode = __getname(); 292 if (!*unicode) { 293 brelse(*bh); 294 return -ENOMEM; 295 } 296 } 297 parse_long: 298 slots = 0; 299 ds = (struct msdos_dir_slot *)*de; 300 id = ds->id; 301 if (!(id & 0x40)) 302 return PARSE_INVALID; 303 slots = id & ~0x40; 304 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ 305 return PARSE_INVALID; 306 *nr_slots = slots; 307 alias_checksum = ds->alias_checksum; 308 309 slot = slots; 310 while (1) { 311 int offset; 312 313 slot--; 314 offset = slot * 13; 315 fat16_towchar(*unicode + offset, ds->name0_4, 5); 316 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); 317 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); 318 319 if (ds->id & 0x40) 320 (*unicode)[offset + 13] = 0; 321 if (fat_get_entry(dir, pos, bh, de) < 0) 322 return PARSE_EOF; 323 if (slot == 0) 324 break; 325 ds = (struct msdos_dir_slot *)*de; 326 if (ds->attr != ATTR_EXT) 327 return PARSE_NOT_LONGNAME; 328 if ((ds->id & ~0x40) != slot) 329 goto parse_long; 330 if (ds->alias_checksum != alias_checksum) 331 goto parse_long; 332 } 333 if ((*de)->name[0] == DELETED_FLAG) 334 return PARSE_INVALID; 335 if ((*de)->attr == ATTR_EXT) 336 goto parse_long; 337 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) 338 return PARSE_INVALID; 339 if (fat_checksum((*de)->name) != alias_checksum) 340 *nr_slots = 0; 341 342 return 0; 343 } 344 345 /** 346 * fat_parse_short - Parse MS-DOS (short) directory entry. 347 * @sb: superblock 348 * @de: directory entry to parse 349 * @name: FAT_MAX_SHORT_SIZE array in which to place extracted name 350 * @dot_hidden: Nonzero == prepend '.' to names with ATTR_HIDDEN 351 * 352 * Returns the number of characters extracted into 'name'. 353 */ 354 static int fat_parse_short(struct super_block *sb, 355 const struct msdos_dir_entry *de, 356 unsigned char *name, int dot_hidden) 357 { 358 const struct msdos_sb_info *sbi = MSDOS_SB(sb); 359 int isvfat = sbi->options.isvfat; 360 int nocase = sbi->options.nocase; 361 unsigned short opt_shortname = sbi->options.shortname; 362 struct nls_table *nls_disk = sbi->nls_disk; 363 wchar_t uni_name[14]; 364 unsigned char c, work[MSDOS_NAME]; 365 unsigned char *ptname = name; 366 int chi, chl, i, j, k; 367 int dotoffset = 0; 368 int name_len = 0, uni_len = 0; 369 370 if (!isvfat && dot_hidden && (de->attr & ATTR_HIDDEN)) { 371 *ptname++ = '.'; 372 dotoffset = 1; 373 } 374 375 memcpy(work, de->name, sizeof(work)); 376 /* see namei.c, msdos_format_name */ 377 if (work[0] == 0x05) 378 work[0] = 0xE5; 379 380 /* Filename */ 381 for (i = 0, j = 0; i < 8;) { 382 c = work[i]; 383 if (!c) 384 break; 385 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, 386 &uni_name[j++], opt_shortname, 387 de->lcase & CASE_LOWER_BASE); 388 if (chl <= 1) { 389 if (!isvfat) 390 ptname[i] = nocase ? c : fat_tolower(c); 391 i++; 392 if (c != ' ') { 393 name_len = i; 394 uni_len = j; 395 } 396 } else { 397 uni_len = j; 398 if (isvfat) 399 i += min(chl, 8-i); 400 else { 401 for (chi = 0; chi < chl && i < 8; chi++, i++) 402 ptname[i] = work[i]; 403 } 404 if (chl) 405 name_len = i; 406 } 407 } 408 409 i = name_len; 410 j = uni_len; 411 fat_short2uni(nls_disk, ".", 1, &uni_name[j++]); 412 if (!isvfat) 413 ptname[i] = '.'; 414 i++; 415 416 /* Extension */ 417 for (k = 8; k < MSDOS_NAME;) { 418 c = work[k]; 419 if (!c) 420 break; 421 chl = fat_shortname2uni(nls_disk, &work[k], MSDOS_NAME - k, 422 &uni_name[j++], opt_shortname, 423 de->lcase & CASE_LOWER_EXT); 424 if (chl <= 1) { 425 k++; 426 if (!isvfat) 427 ptname[i] = nocase ? c : fat_tolower(c); 428 i++; 429 if (c != ' ') { 430 name_len = i; 431 uni_len = j; 432 } 433 } else { 434 uni_len = j; 435 if (isvfat) { 436 int offset = min(chl, MSDOS_NAME-k); 437 k += offset; 438 i += offset; 439 } else { 440 for (chi = 0; chi < chl && k < MSDOS_NAME; 441 chi++, i++, k++) { 442 ptname[i] = work[k]; 443 } 444 } 445 if (chl) 446 name_len = i; 447 } 448 } 449 450 if (name_len > 0) { 451 name_len += dotoffset; 452 453 if (sbi->options.isvfat) { 454 uni_name[uni_len] = 0x0000; 455 name_len = fat_uni_to_x8(sb, uni_name, name, 456 FAT_MAX_SHORT_SIZE); 457 } 458 } 459 460 return name_len; 461 } 462 463 /* 464 * Return values: negative -> error/not found, 0 -> found. 465 */ 466 int fat_search_long(struct inode *inode, const unsigned char *name, 467 int name_len, struct fat_slot_info *sinfo) 468 { 469 struct super_block *sb = inode->i_sb; 470 struct msdos_sb_info *sbi = MSDOS_SB(sb); 471 struct buffer_head *bh = NULL; 472 struct msdos_dir_entry *de; 473 unsigned char nr_slots; 474 wchar_t *unicode = NULL; 475 unsigned char bufname[FAT_MAX_SHORT_SIZE]; 476 loff_t cpos = 0; 477 int err, len; 478 479 err = -ENOENT; 480 while (1) { 481 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 482 goto end_of_dir; 483 parse_record: 484 nr_slots = 0; 485 if (de->name[0] == DELETED_FLAG) 486 continue; 487 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 488 continue; 489 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 490 continue; 491 if (de->attr == ATTR_EXT) { 492 int status = fat_parse_long(inode, &cpos, &bh, &de, 493 &unicode, &nr_slots); 494 if (status < 0) { 495 err = status; 496 goto end_of_dir; 497 } else if (status == PARSE_INVALID) 498 continue; 499 else if (status == PARSE_NOT_LONGNAME) 500 goto parse_record; 501 else if (status == PARSE_EOF) 502 goto end_of_dir; 503 } 504 505 /* Never prepend '.' to hidden files here. 506 * That is done only for msdos mounts (and only when 507 * 'dotsOK=yes'); if we are executing here, it is in the 508 * context of a vfat mount. 509 */ 510 len = fat_parse_short(sb, de, bufname, 0); 511 if (len == 0) 512 continue; 513 514 /* Compare shortname */ 515 if (fat_name_match(sbi, name, name_len, bufname, len)) 516 goto found; 517 518 if (nr_slots) { 519 void *longname = unicode + FAT_MAX_UNI_CHARS; 520 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 521 522 /* Compare longname */ 523 len = fat_uni_to_x8(sb, unicode, longname, size); 524 if (fat_name_match(sbi, name, name_len, longname, len)) 525 goto found; 526 } 527 } 528 529 found: 530 nr_slots++; /* include the de */ 531 sinfo->slot_off = cpos - nr_slots * sizeof(*de); 532 sinfo->nr_slots = nr_slots; 533 sinfo->de = de; 534 sinfo->bh = bh; 535 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 536 err = 0; 537 end_of_dir: 538 if (unicode) 539 __putname(unicode); 540 541 return err; 542 } 543 EXPORT_SYMBOL_GPL(fat_search_long); 544 545 struct fat_ioctl_filldir_callback { 546 struct dir_context ctx; 547 void __user *dirent; 548 int result; 549 /* for dir ioctl */ 550 const char *longname; 551 int long_len; 552 const char *shortname; 553 int short_len; 554 }; 555 556 static int __fat_readdir(struct inode *inode, struct file *file, 557 struct dir_context *ctx, int short_only, 558 struct fat_ioctl_filldir_callback *both) 559 { 560 struct super_block *sb = inode->i_sb; 561 struct msdos_sb_info *sbi = MSDOS_SB(sb); 562 struct buffer_head *bh; 563 struct msdos_dir_entry *de; 564 unsigned char nr_slots; 565 wchar_t *unicode = NULL; 566 unsigned char bufname[FAT_MAX_SHORT_SIZE]; 567 int isvfat = sbi->options.isvfat; 568 const char *fill_name = NULL; 569 int fake_offset = 0; 570 loff_t cpos; 571 int short_len = 0, fill_len = 0; 572 int ret = 0; 573 574 mutex_lock(&sbi->s_lock); 575 576 cpos = ctx->pos; 577 /* Fake . and .. for the root directory. */ 578 if (inode->i_ino == MSDOS_ROOT_INO) { 579 if (!dir_emit_dots(file, ctx)) 580 goto out; 581 if (ctx->pos == 2) { 582 fake_offset = 1; 583 cpos = 0; 584 } 585 } 586 if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { 587 ret = -ENOENT; 588 goto out; 589 } 590 591 bh = NULL; 592 get_new: 593 if (fat_get_entry(inode, &cpos, &bh, &de) == -1) 594 goto end_of_dir; 595 parse_record: 596 nr_slots = 0; 597 /* 598 * Check for long filename entry, but if short_only, we don't 599 * need to parse long filename. 600 */ 601 if (isvfat && !short_only) { 602 if (de->name[0] == DELETED_FLAG) 603 goto record_end; 604 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) 605 goto record_end; 606 if (de->attr != ATTR_EXT && IS_FREE(de->name)) 607 goto record_end; 608 } else { 609 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) 610 goto record_end; 611 } 612 613 if (isvfat && de->attr == ATTR_EXT) { 614 int status = fat_parse_long(inode, &cpos, &bh, &de, 615 &unicode, &nr_slots); 616 if (status < 0) { 617 ctx->pos = cpos; 618 ret = status; 619 goto out; 620 } else if (status == PARSE_INVALID) 621 goto record_end; 622 else if (status == PARSE_NOT_LONGNAME) 623 goto parse_record; 624 else if (status == PARSE_EOF) 625 goto end_of_dir; 626 627 if (nr_slots) { 628 void *longname = unicode + FAT_MAX_UNI_CHARS; 629 int size = PATH_MAX - FAT_MAX_UNI_SIZE; 630 int len = fat_uni_to_x8(sb, unicode, longname, size); 631 632 fill_name = longname; 633 fill_len = len; 634 /* !both && !short_only, so we don't need shortname. */ 635 if (!both) 636 goto start_filldir; 637 638 short_len = fat_parse_short(sb, de, bufname, 639 sbi->options.dotsOK); 640 if (short_len == 0) 641 goto record_end; 642 /* hack for fat_ioctl_filldir() */ 643 both->longname = fill_name; 644 both->long_len = fill_len; 645 both->shortname = bufname; 646 both->short_len = short_len; 647 fill_name = NULL; 648 fill_len = 0; 649 goto start_filldir; 650 } 651 } 652 653 short_len = fat_parse_short(sb, de, bufname, sbi->options.dotsOK); 654 if (short_len == 0) 655 goto record_end; 656 657 fill_name = bufname; 658 fill_len = short_len; 659 660 start_filldir: 661 if (!fake_offset) 662 ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); 663 664 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) { 665 if (!dir_emit_dot(file, ctx)) 666 goto fill_failed; 667 } else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 668 if (!dir_emit_dotdot(file, ctx)) 669 goto fill_failed; 670 } else { 671 unsigned long inum; 672 loff_t i_pos = fat_make_i_pos(sb, bh, de); 673 struct inode *tmp = fat_iget(sb, i_pos); 674 if (tmp) { 675 inum = tmp->i_ino; 676 iput(tmp); 677 } else 678 inum = iunique(sb, MSDOS_ROOT_INO); 679 if (!dir_emit(ctx, fill_name, fill_len, inum, 680 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG)) 681 goto fill_failed; 682 } 683 684 record_end: 685 fake_offset = 0; 686 ctx->pos = cpos; 687 goto get_new; 688 end_of_dir: 689 ctx->pos = cpos; 690 fill_failed: 691 brelse(bh); 692 if (unicode) 693 __putname(unicode); 694 out: 695 mutex_unlock(&sbi->s_lock); 696 return ret; 697 } 698 699 static int fat_readdir(struct file *file, struct dir_context *ctx) 700 { 701 return __fat_readdir(file_inode(file), file, ctx, 0, NULL); 702 } 703 704 #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ 705 static int func(void *__buf, const char *name, int name_len, \ 706 loff_t offset, u64 ino, unsigned int d_type) \ 707 { \ 708 struct fat_ioctl_filldir_callback *buf = __buf; \ 709 struct dirent_type __user *d1 = buf->dirent; \ 710 struct dirent_type __user *d2 = d1 + 1; \ 711 \ 712 if (buf->result) \ 713 return -EINVAL; \ 714 buf->result++; \ 715 \ 716 if (name != NULL) { \ 717 /* dirent has only short name */ \ 718 if (name_len >= sizeof(d1->d_name)) \ 719 name_len = sizeof(d1->d_name) - 1; \ 720 \ 721 if (put_user(0, d2->d_name) || \ 722 put_user(0, &d2->d_reclen) || \ 723 copy_to_user(d1->d_name, name, name_len) || \ 724 put_user(0, d1->d_name + name_len) || \ 725 put_user(name_len, &d1->d_reclen)) \ 726 goto efault; \ 727 } else { \ 728 /* dirent has short and long name */ \ 729 const char *longname = buf->longname; \ 730 int long_len = buf->long_len; \ 731 const char *shortname = buf->shortname; \ 732 int short_len = buf->short_len; \ 733 \ 734 if (long_len >= sizeof(d1->d_name)) \ 735 long_len = sizeof(d1->d_name) - 1; \ 736 if (short_len >= sizeof(d1->d_name)) \ 737 short_len = sizeof(d1->d_name) - 1; \ 738 \ 739 if (copy_to_user(d2->d_name, longname, long_len) || \ 740 put_user(0, d2->d_name + long_len) || \ 741 put_user(long_len, &d2->d_reclen) || \ 742 put_user(ino, &d2->d_ino) || \ 743 put_user(offset, &d2->d_off) || \ 744 copy_to_user(d1->d_name, shortname, short_len) || \ 745 put_user(0, d1->d_name + short_len) || \ 746 put_user(short_len, &d1->d_reclen)) \ 747 goto efault; \ 748 } \ 749 return 0; \ 750 efault: \ 751 buf->result = -EFAULT; \ 752 return -EFAULT; \ 753 } 754 755 FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) 756 757 static int fat_ioctl_readdir(struct inode *inode, struct file *file, 758 void __user *dirent, filldir_t filldir, 759 int short_only, int both) 760 { 761 struct fat_ioctl_filldir_callback buf = { 762 .ctx.actor = filldir, 763 .dirent = dirent 764 }; 765 int ret; 766 767 buf.dirent = dirent; 768 buf.result = 0; 769 mutex_lock(&inode->i_mutex); 770 buf.ctx.pos = file->f_pos; 771 ret = -ENOENT; 772 if (!IS_DEADDIR(inode)) { 773 ret = __fat_readdir(inode, file, &buf.ctx, 774 short_only, both ? &buf : NULL); 775 file->f_pos = buf.ctx.pos; 776 } 777 mutex_unlock(&inode->i_mutex); 778 if (ret >= 0) 779 ret = buf.result; 780 return ret; 781 } 782 783 static long fat_dir_ioctl(struct file *filp, unsigned int cmd, 784 unsigned long arg) 785 { 786 struct inode *inode = file_inode(filp); 787 struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; 788 int short_only, both; 789 790 switch (cmd) { 791 case VFAT_IOCTL_READDIR_SHORT: 792 short_only = 1; 793 both = 0; 794 break; 795 case VFAT_IOCTL_READDIR_BOTH: 796 short_only = 0; 797 both = 1; 798 break; 799 default: 800 return fat_generic_ioctl(filp, cmd, arg); 801 } 802 803 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2]))) 804 return -EFAULT; 805 /* 806 * Yes, we don't need this put_user() absolutely. However old 807 * code didn't return the right value. So, app use this value, 808 * in order to check whether it is EOF. 809 */ 810 if (put_user(0, &d1->d_reclen)) 811 return -EFAULT; 812 813 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, 814 short_only, both); 815 } 816 817 #ifdef CONFIG_COMPAT 818 #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) 819 #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) 820 821 FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) 822 823 static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, 824 unsigned long arg) 825 { 826 struct inode *inode = file_inode(filp); 827 struct compat_dirent __user *d1 = compat_ptr(arg); 828 int short_only, both; 829 830 switch (cmd) { 831 case VFAT_IOCTL_READDIR_SHORT32: 832 short_only = 1; 833 both = 0; 834 break; 835 case VFAT_IOCTL_READDIR_BOTH32: 836 short_only = 0; 837 both = 1; 838 break; 839 default: 840 return fat_generic_ioctl(filp, cmd, (unsigned long)arg); 841 } 842 843 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) 844 return -EFAULT; 845 /* 846 * Yes, we don't need this put_user() absolutely. However old 847 * code didn't return the right value. So, app use this value, 848 * in order to check whether it is EOF. 849 */ 850 if (put_user(0, &d1->d_reclen)) 851 return -EFAULT; 852 853 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, 854 short_only, both); 855 } 856 #endif /* CONFIG_COMPAT */ 857 858 const struct file_operations fat_dir_operations = { 859 .llseek = generic_file_llseek, 860 .read = generic_read_dir, 861 .iterate = fat_readdir, 862 .unlocked_ioctl = fat_dir_ioctl, 863 #ifdef CONFIG_COMPAT 864 .compat_ioctl = fat_compat_dir_ioctl, 865 #endif 866 .fsync = fat_file_fsync, 867 }; 868 869 static int fat_get_short_entry(struct inode *dir, loff_t *pos, 870 struct buffer_head **bh, 871 struct msdos_dir_entry **de) 872 { 873 while (fat_get_entry(dir, pos, bh, de) >= 0) { 874 /* free entry or long name entry or volume label */ 875 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) 876 return 0; 877 } 878 return -ENOENT; 879 } 880 881 /* 882 * The ".." entry can not provide the "struct fat_slot_info" information 883 * for inode, nor a usable i_pos. So, this function provides some information 884 * only. 885 * 886 * Since this function walks through the on-disk inodes within a directory, 887 * callers are responsible for taking any locks necessary to prevent the 888 * directory from changing. 889 */ 890 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, 891 struct msdos_dir_entry **de) 892 { 893 loff_t offset = 0; 894 895 *de = NULL; 896 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { 897 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) 898 return 0; 899 } 900 return -ENOENT; 901 } 902 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); 903 904 /* See if directory is empty */ 905 int fat_dir_empty(struct inode *dir) 906 { 907 struct buffer_head *bh; 908 struct msdos_dir_entry *de; 909 loff_t cpos; 910 int result = 0; 911 912 bh = NULL; 913 cpos = 0; 914 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 915 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && 916 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { 917 result = -ENOTEMPTY; 918 break; 919 } 920 } 921 brelse(bh); 922 return result; 923 } 924 EXPORT_SYMBOL_GPL(fat_dir_empty); 925 926 /* 927 * fat_subdirs counts the number of sub-directories of dir. It can be run 928 * on directories being created. 929 */ 930 int fat_subdirs(struct inode *dir) 931 { 932 struct buffer_head *bh; 933 struct msdos_dir_entry *de; 934 loff_t cpos; 935 int count = 0; 936 937 bh = NULL; 938 cpos = 0; 939 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { 940 if (de->attr & ATTR_DIR) 941 count++; 942 } 943 brelse(bh); 944 return count; 945 } 946 947 /* 948 * Scans a directory for a given file (name points to its formatted name). 949 * Returns an error code or zero. 950 */ 951 int fat_scan(struct inode *dir, const unsigned char *name, 952 struct fat_slot_info *sinfo) 953 { 954 struct super_block *sb = dir->i_sb; 955 956 sinfo->slot_off = 0; 957 sinfo->bh = NULL; 958 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 959 &sinfo->de) >= 0) { 960 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { 961 sinfo->slot_off -= sizeof(*sinfo->de); 962 sinfo->nr_slots = 1; 963 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 964 return 0; 965 } 966 } 967 return -ENOENT; 968 } 969 EXPORT_SYMBOL_GPL(fat_scan); 970 971 /* 972 * Scans a directory for a given logstart. 973 * Returns an error code or zero. 974 */ 975 int fat_scan_logstart(struct inode *dir, int i_logstart, 976 struct fat_slot_info *sinfo) 977 { 978 struct super_block *sb = dir->i_sb; 979 980 sinfo->slot_off = 0; 981 sinfo->bh = NULL; 982 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, 983 &sinfo->de) >= 0) { 984 if (fat_get_start(MSDOS_SB(sb), sinfo->de) == i_logstart) { 985 sinfo->slot_off -= sizeof(*sinfo->de); 986 sinfo->nr_slots = 1; 987 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 988 return 0; 989 } 990 } 991 return -ENOENT; 992 } 993 994 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) 995 { 996 struct super_block *sb = dir->i_sb; 997 struct buffer_head *bh; 998 struct msdos_dir_entry *de, *endp; 999 int err = 0, orig_slots; 1000 1001 while (nr_slots) { 1002 bh = NULL; 1003 if (fat_get_entry(dir, &pos, &bh, &de) < 0) { 1004 err = -EIO; 1005 break; 1006 } 1007 1008 orig_slots = nr_slots; 1009 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); 1010 while (nr_slots && de < endp) { 1011 de->name[0] = DELETED_FLAG; 1012 de++; 1013 nr_slots--; 1014 } 1015 mark_buffer_dirty_inode(bh, dir); 1016 if (IS_DIRSYNC(dir)) 1017 err = sync_dirty_buffer(bh); 1018 brelse(bh); 1019 if (err) 1020 break; 1021 1022 /* pos is *next* de's position, so this does `- sizeof(de)' */ 1023 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); 1024 } 1025 1026 return err; 1027 } 1028 1029 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) 1030 { 1031 struct super_block *sb = dir->i_sb; 1032 struct msdos_dir_entry *de; 1033 struct buffer_head *bh; 1034 int err = 0, nr_slots; 1035 1036 /* 1037 * First stage: Remove the shortname. By this, the directory 1038 * entry is removed. 1039 */ 1040 nr_slots = sinfo->nr_slots; 1041 de = sinfo->de; 1042 sinfo->de = NULL; 1043 bh = sinfo->bh; 1044 sinfo->bh = NULL; 1045 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { 1046 de->name[0] = DELETED_FLAG; 1047 de--; 1048 nr_slots--; 1049 } 1050 mark_buffer_dirty_inode(bh, dir); 1051 if (IS_DIRSYNC(dir)) 1052 err = sync_dirty_buffer(bh); 1053 brelse(bh); 1054 if (err) 1055 return err; 1056 dir->i_version++; 1057 1058 if (nr_slots) { 1059 /* 1060 * Second stage: remove the remaining longname slots. 1061 * (This directory entry is already removed, and so return 1062 * the success) 1063 */ 1064 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); 1065 if (err) { 1066 fat_msg(sb, KERN_WARNING, 1067 "Couldn't remove the long name slots"); 1068 } 1069 } 1070 1071 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; 1072 if (IS_DIRSYNC(dir)) 1073 (void)fat_sync_inode(dir); 1074 else 1075 mark_inode_dirty(dir); 1076 1077 return 0; 1078 } 1079 EXPORT_SYMBOL_GPL(fat_remove_entries); 1080 1081 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, 1082 struct buffer_head **bhs, int nr_bhs) 1083 { 1084 struct super_block *sb = dir->i_sb; 1085 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; 1086 int err, i, n; 1087 1088 /* Zeroing the unused blocks on this cluster */ 1089 blknr += nr_used; 1090 n = nr_used; 1091 while (blknr < last_blknr) { 1092 bhs[n] = sb_getblk(sb, blknr); 1093 if (!bhs[n]) { 1094 err = -ENOMEM; 1095 goto error; 1096 } 1097 memset(bhs[n]->b_data, 0, sb->s_blocksize); 1098 set_buffer_uptodate(bhs[n]); 1099 mark_buffer_dirty_inode(bhs[n], dir); 1100 1101 n++; 1102 blknr++; 1103 if (n == nr_bhs) { 1104 if (IS_DIRSYNC(dir)) { 1105 err = fat_sync_bhs(bhs, n); 1106 if (err) 1107 goto error; 1108 } 1109 for (i = 0; i < n; i++) 1110 brelse(bhs[i]); 1111 n = 0; 1112 } 1113 } 1114 if (IS_DIRSYNC(dir)) { 1115 err = fat_sync_bhs(bhs, n); 1116 if (err) 1117 goto error; 1118 } 1119 for (i = 0; i < n; i++) 1120 brelse(bhs[i]); 1121 1122 return 0; 1123 1124 error: 1125 for (i = 0; i < n; i++) 1126 bforget(bhs[i]); 1127 return err; 1128 } 1129 1130 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) 1131 { 1132 struct super_block *sb = dir->i_sb; 1133 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1134 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1135 struct msdos_dir_entry *de; 1136 sector_t blknr; 1137 __le16 date, time; 1138 u8 time_cs; 1139 int err, cluster; 1140 1141 err = fat_alloc_clusters(dir, &cluster, 1); 1142 if (err) 1143 goto error; 1144 1145 blknr = fat_clus_to_blknr(sbi, cluster); 1146 bhs[0] = sb_getblk(sb, blknr); 1147 if (!bhs[0]) { 1148 err = -ENOMEM; 1149 goto error_free; 1150 } 1151 1152 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); 1153 1154 de = (struct msdos_dir_entry *)bhs[0]->b_data; 1155 /* filling the new directory slots ("." and ".." entries) */ 1156 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); 1157 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); 1158 de->attr = de[1].attr = ATTR_DIR; 1159 de[0].lcase = de[1].lcase = 0; 1160 de[0].time = de[1].time = time; 1161 de[0].date = de[1].date = date; 1162 if (sbi->options.isvfat) { 1163 /* extra timestamps */ 1164 de[0].ctime = de[1].ctime = time; 1165 de[0].ctime_cs = de[1].ctime_cs = time_cs; 1166 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; 1167 } else { 1168 de[0].ctime = de[1].ctime = 0; 1169 de[0].ctime_cs = de[1].ctime_cs = 0; 1170 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; 1171 } 1172 fat_set_start(&de[0], cluster); 1173 fat_set_start(&de[1], MSDOS_I(dir)->i_logstart); 1174 de[0].size = de[1].size = 0; 1175 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); 1176 set_buffer_uptodate(bhs[0]); 1177 mark_buffer_dirty_inode(bhs[0], dir); 1178 1179 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); 1180 if (err) 1181 goto error_free; 1182 1183 return cluster; 1184 1185 error_free: 1186 fat_free_clusters(dir, cluster); 1187 error: 1188 return err; 1189 } 1190 EXPORT_SYMBOL_GPL(fat_alloc_new_dir); 1191 1192 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, 1193 int *nr_cluster, struct msdos_dir_entry **de, 1194 struct buffer_head **bh, loff_t *i_pos) 1195 { 1196 struct super_block *sb = dir->i_sb; 1197 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1198 struct buffer_head *bhs[MAX_BUF_PER_PAGE]; 1199 sector_t blknr, start_blknr, last_blknr; 1200 unsigned long size, copy; 1201 int err, i, n, offset, cluster[2]; 1202 1203 /* 1204 * The minimum cluster size is 512bytes, and maximum entry 1205 * size is 32*slots (672bytes). So, iff the cluster size is 1206 * 512bytes, we may need two clusters. 1207 */ 1208 size = nr_slots * sizeof(struct msdos_dir_entry); 1209 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; 1210 BUG_ON(*nr_cluster > 2); 1211 1212 err = fat_alloc_clusters(dir, cluster, *nr_cluster); 1213 if (err) 1214 goto error; 1215 1216 /* 1217 * First stage: Fill the directory entry. NOTE: This cluster 1218 * is not referenced from any inode yet, so updates order is 1219 * not important. 1220 */ 1221 i = n = copy = 0; 1222 do { 1223 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); 1224 last_blknr = start_blknr + sbi->sec_per_clus; 1225 while (blknr < last_blknr) { 1226 bhs[n] = sb_getblk(sb, blknr); 1227 if (!bhs[n]) { 1228 err = -ENOMEM; 1229 goto error_nomem; 1230 } 1231 1232 /* fill the directory entry */ 1233 copy = min(size, sb->s_blocksize); 1234 memcpy(bhs[n]->b_data, slots, copy); 1235 slots += copy; 1236 size -= copy; 1237 set_buffer_uptodate(bhs[n]); 1238 mark_buffer_dirty_inode(bhs[n], dir); 1239 if (!size) 1240 break; 1241 n++; 1242 blknr++; 1243 } 1244 } while (++i < *nr_cluster); 1245 1246 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); 1247 offset = copy - sizeof(struct msdos_dir_entry); 1248 get_bh(bhs[n]); 1249 *bh = bhs[n]; 1250 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); 1251 *i_pos = fat_make_i_pos(sb, *bh, *de); 1252 1253 /* Second stage: clear the rest of cluster, and write outs */ 1254 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); 1255 if (err) 1256 goto error_free; 1257 1258 return cluster[0]; 1259 1260 error_free: 1261 brelse(*bh); 1262 *bh = NULL; 1263 n = 0; 1264 error_nomem: 1265 for (i = 0; i < n; i++) 1266 bforget(bhs[i]); 1267 fat_free_clusters(dir, cluster[0]); 1268 error: 1269 return err; 1270 } 1271 1272 int fat_add_entries(struct inode *dir, void *slots, int nr_slots, 1273 struct fat_slot_info *sinfo) 1274 { 1275 struct super_block *sb = dir->i_sb; 1276 struct msdos_sb_info *sbi = MSDOS_SB(sb); 1277 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ 1278 struct msdos_dir_entry *uninitialized_var(de); 1279 int err, free_slots, i, nr_bhs; 1280 loff_t pos, i_pos; 1281 1282 sinfo->nr_slots = nr_slots; 1283 1284 /* First stage: search free directory entries */ 1285 free_slots = nr_bhs = 0; 1286 bh = prev = NULL; 1287 pos = 0; 1288 err = -ENOSPC; 1289 while (fat_get_entry(dir, &pos, &bh, &de) > -1) { 1290 /* check the maximum size of directory */ 1291 if (pos >= FAT_MAX_DIR_SIZE) 1292 goto error; 1293 1294 if (IS_FREE(de->name)) { 1295 if (prev != bh) { 1296 get_bh(bh); 1297 bhs[nr_bhs] = prev = bh; 1298 nr_bhs++; 1299 } 1300 free_slots++; 1301 if (free_slots == nr_slots) 1302 goto found; 1303 } else { 1304 for (i = 0; i < nr_bhs; i++) 1305 brelse(bhs[i]); 1306 prev = NULL; 1307 free_slots = nr_bhs = 0; 1308 } 1309 } 1310 if (dir->i_ino == MSDOS_ROOT_INO) { 1311 if (sbi->fat_bits != 32) 1312 goto error; 1313 } else if (MSDOS_I(dir)->i_start == 0) { 1314 fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)", 1315 MSDOS_I(dir)->i_pos); 1316 err = -EIO; 1317 goto error; 1318 } 1319 1320 found: 1321 err = 0; 1322 pos -= free_slots * sizeof(*de); 1323 nr_slots -= free_slots; 1324 if (free_slots) { 1325 /* 1326 * Second stage: filling the free entries with new entries. 1327 * NOTE: If this slots has shortname, first, we write 1328 * the long name slots, then write the short name. 1329 */ 1330 int size = free_slots * sizeof(*de); 1331 int offset = pos & (sb->s_blocksize - 1); 1332 int long_bhs = nr_bhs - (nr_slots == 0); 1333 1334 /* Fill the long name slots. */ 1335 for (i = 0; i < long_bhs; i++) { 1336 int copy = min_t(int, sb->s_blocksize - offset, size); 1337 memcpy(bhs[i]->b_data + offset, slots, copy); 1338 mark_buffer_dirty_inode(bhs[i], dir); 1339 offset = 0; 1340 slots += copy; 1341 size -= copy; 1342 } 1343 if (long_bhs && IS_DIRSYNC(dir)) 1344 err = fat_sync_bhs(bhs, long_bhs); 1345 if (!err && i < nr_bhs) { 1346 /* Fill the short name slot. */ 1347 int copy = min_t(int, sb->s_blocksize - offset, size); 1348 memcpy(bhs[i]->b_data + offset, slots, copy); 1349 mark_buffer_dirty_inode(bhs[i], dir); 1350 if (IS_DIRSYNC(dir)) 1351 err = sync_dirty_buffer(bhs[i]); 1352 } 1353 for (i = 0; i < nr_bhs; i++) 1354 brelse(bhs[i]); 1355 if (err) 1356 goto error_remove; 1357 } 1358 1359 if (nr_slots) { 1360 int cluster, nr_cluster; 1361 1362 /* 1363 * Third stage: allocate the cluster for new entries. 1364 * And initialize the cluster with new entries, then 1365 * add the cluster to dir. 1366 */ 1367 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, 1368 &de, &bh, &i_pos); 1369 if (cluster < 0) { 1370 err = cluster; 1371 goto error_remove; 1372 } 1373 err = fat_chain_add(dir, cluster, nr_cluster); 1374 if (err) { 1375 fat_free_clusters(dir, cluster); 1376 goto error_remove; 1377 } 1378 if (dir->i_size & (sbi->cluster_size - 1)) { 1379 fat_fs_error(sb, "Odd directory size"); 1380 dir->i_size = (dir->i_size + sbi->cluster_size - 1) 1381 & ~((loff_t)sbi->cluster_size - 1); 1382 } 1383 dir->i_size += nr_cluster << sbi->cluster_bits; 1384 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; 1385 } 1386 sinfo->slot_off = pos; 1387 sinfo->de = de; 1388 sinfo->bh = bh; 1389 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); 1390 1391 return 0; 1392 1393 error: 1394 brelse(bh); 1395 for (i = 0; i < nr_bhs; i++) 1396 brelse(bhs[i]); 1397 return err; 1398 1399 error_remove: 1400 brelse(bh); 1401 if (free_slots) 1402 __fat_remove_entries(dir, pos, free_slots); 1403 return err; 1404 } 1405 EXPORT_SYMBOL_GPL(fat_add_entries); 1406