fs/fat/prince-fat/fat-2.6.19/dir.c

   1 /*
   2  *  linux/fs/fat/dir.c
   3  *
   4  *  directory handling functions for fat-based filesystems
   5  *
   6  *  Written 1992,1993 by Werner Almesberger
   7  *
   8  *  Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
   9  *
  10  *  VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
  11  *  Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
  12  *  Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
  13  *  Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/slab.h>
  18 #include <linux/time.h>
  19 #include <linux/msdos_fs.h>
  20 #include <linux/dirent.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/buffer_head.h>
  23 #include <linux/compat.h>
  24 #include <asm/uaccess.h>
  25
  26 static inline loff_t fat_make_i_pos(struct super_block *sb,
  27                                     struct buffer_head *bh,
  28                                     struct msdos_dir_entry *de)
  29 {
  30         return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
  31                 | (de - (struct msdos_dir_entry *)bh->b_data);
  32 }
  33
  34 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
  35                                      sector_t phys)
  36 {
  37         struct super_block *sb = dir->i_sb;
  38         struct msdos_sb_info *sbi = MSDOS_SB(sb);
  39         struct buffer_head *bh;
  40         int sec;
  41
  42         /* This is not a first sector of cluster, or sec_per_clus == 1 */
  43         if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
  44                 return;
  45         /* root dir of FAT12/FAT16 */
  46         if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
  47                 return;
  48
  49         bh = sb_find_get_block(sb, phys);
  50         if (bh == NULL || !buffer_uptodate(bh)) {
  51                 for (sec = 0; sec < sbi->sec_per_clus; sec++)
  52                         sb_breadahead(sb, phys + sec);
  53         }
  54         brelse(bh);
  55 }
  56
  57 /* Returns the inode number of the directory entry at offset pos. If bh is
  58    non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
  59    returned in bh.
  60    AV. Most often we do it item-by-item. Makes sense to optimize.
  61    AV. OK, there we go: if both bh and de are non-NULL we assume that we just
  62    AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
  63    AV. It's done in fat_get_entry() (inlined), here the slow case lives.
  64    AV. Additionally, when we return -1 (i.e. reached the end of directory)
  65    AV. we make bh NULL.
  66  */
  67 static int fat__get_entry(struct inode *dir, loff_t *pos,
  68                           struct buffer_head **bh, struct msdos_dir_entry **de)
  69 {
  70         struct super_block *sb = dir->i_sb;
  71         sector_t phys, iblock;
  72         unsigned long mapped_blocks;
  73         int err, offset;
  74
  75 next:
  76         if (*bh)
  77                 brelse(*bh);
  78
  79         *bh = NULL;
  80         iblock = *pos >> sb->s_blocksize_bits;
  81         err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
  82         if (err || !phys)
  83                 return -1;      /* beyond EOF or error */
  84
  85         fat_dir_readahead(dir, iblock, phys);
  86
  87         *bh = sb_bread(sb, phys);
  88         if (*bh == NULL) {
  89                 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
  90                        (unsigned long long)phys);
  91                 /* skip this block */
  92                 *pos = (iblock + 1) << sb->s_blocksize_bits;
  93                 goto next;
  94         }
  95
  96         offset = *pos & (sb->s_blocksize - 1);
  97         *pos += sizeof(struct msdos_dir_entry);
  98         *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
  99
 100         return 0;
 101 }
 102
 103 static inline int fat_get_entry(struct inode *dir, loff_t *pos,
 104                                 struct buffer_head **bh,
 105                                 struct msdos_dir_entry **de)
 106 {
 107         /* Fast stuff first */
 108         if (*bh && *de &&
 109             (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
 110                 *pos += sizeof(struct msdos_dir_entry);
 111                 (*de)++;
 112                 return 0;
 113         }
 114         return fat__get_entry(dir, pos, bh, de);
 115 }
 116
 117 /*
 118  * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII.
 119  * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
 120  * colon as an escape character since it is normally invalid on the vfat
 121  * filesystem. The following four characters are the hexadecimal digits
 122  * of Unicode value. This lets us do a full dump and restore of Unicode
 123  * filenames. We could get into some trouble with long Unicode names,
 124  * but ignore that right now.
 125  * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
 126  */
 127 static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
 128                        struct nls_table *nls)
 129 {
 130         wchar_t *ip, ec;
 131         unsigned char *op, nc;
 132         int charlen;
 133         int k;
 134
 135         ip = uni;
 136         op = ascii;
 137
 138         while (*ip) {
 139                 ec = *ip++;
 140                 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
 141                         op += charlen;
 142                 } else {
 143                         if (uni_xlate == 1) {
 144                                 *op = ':';
 145                                 for (k = 4; k > 0; k--) {
 146                                         nc = ec & 0xF;
 147                                         op[k] = nc > 9  ? nc + ('a' - 10)
 148                                                         : nc + '0';
 149                                         ec >>= 4;
 150                                 }
 151                                 op += 5;
 152                         } else {
 153                                 *op++ = '?';
 154                         }
 155                 }
 156                 /* We have some slack there, so it's OK */
 157                 if (op>ascii+256) {
 158                         op = ascii + 256;
 159                         break;
 160                 }
 161         }
 162         *op = 0;
 163         return (op - ascii);
 164 }
 165
 166 static inline int
 167 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
 168 {
 169         int charlen;
 170
 171         charlen = t->char2uni(c, clen, uni);
 172         if (charlen < 0) {
 173                 *uni = 0x003f;  /* a question mark */
 174                 charlen = 1;
 175         }
 176         return charlen;
 177 }
 178
 179 static inline int
 180 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
 181 {
 182         int charlen;
 183         wchar_t wc;
 184
 185         charlen = t->char2uni(c, clen, &wc);
 186         if (charlen < 0) {
 187                 *uni = 0x003f;  /* a question mark */
 188                 charlen = 1;
 189         } else if (charlen <= 1) {
 190                 unsigned char nc = t->charset2lower[*c];
 191
 192                 if (!nc)
 193                         nc = *c;
 194
 195                 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
 196                         *uni = 0x003f;  /* a question mark */
 197                         charlen = 1;
 198                 }
 199         } else
 200                 *uni = wc;
 201
 202         return charlen;
 203 }
 204
 205 static inline int
 206 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
 207                   wchar_t *uni_buf, unsigned short opt, int lower)
 208 {
 209         int len = 0;
 210
 211         if (opt & VFAT_SFN_DISPLAY_LOWER)
 212                 len =  fat_short2lower_uni(nls, buf, buf_size, uni_buf);
 213         else if (opt & VFAT_SFN_DISPLAY_WIN95)
 214                 len = fat_short2uni(nls, buf, buf_size, uni_buf);
 215         else if (opt & VFAT_SFN_DISPLAY_WINNT) {
 216                 if (lower)
 217                         len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
 218                 else
 219                         len = fat_short2uni(nls, buf, buf_size, uni_buf);
 220         } else
 221                 len = fat_short2uni(nls, buf, buf_size, uni_buf);
 222
 223         return len;
 224 }
 225
 226 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
 227
 228 /**
 229  * fat_parse_long - Parse extended directory entry.
 230  *
 231  * This function returns zero on success, negative value on error, or one of
 232  * the following:
 233  *
 234  * %PARSE_INVALID - Directory entry is invalid.
 235  * %PARSE_NOT_LONGNAME - Directory entry does not contain longname.
 236  * %PARSE_EOF - Directory has no more entries.
 237  */
 238 static int fat_parse_long(struct inode *dir, loff_t *pos,
 239                           struct buffer_head **bh, struct msdos_dir_entry **de,
 240                           wchar_t **unicode, unsigned char *nr_slots)
 241 {
 242         struct msdos_dir_slot *ds;
 243         unsigned char id, slot, slots, alias_checksum;
 244
 245         if (!*unicode) {
 246                 *unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
 247                 if (!*unicode) {
 248                         brelse(*bh);
 249                         return -ENOMEM;
 250                 }
 251         }
 252 parse_long:
 253         slots = 0;
 254         ds = (struct msdos_dir_slot *)*de;
 255         id = ds->id;
 256         if (!(id & 0x40))
 257                 return PARSE_INVALID;
 258         slots = id & ~0x40;
 259         if (slots > 20 || !slots)       /* ceil(256 * 2 / 26) */
 260                 return PARSE_INVALID;
 261         *nr_slots = slots;
 262         alias_checksum = ds->alias_checksum;
 263
 264         slot = slots;
 265         while (1) {
 266                 int offset;
 267
 268                 slot--;
 269                 offset = slot * 13;
 270                 fat16_towchar(*unicode + offset, ds->name0_4, 5);
 271                 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6);
 272                 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2);
 273
 274                 if (ds->id & 0x40)
 275                         (*unicode)[offset + 13] = 0;
 276                 if (fat_get_entry(dir, pos, bh, de) < 0)
 277                         return PARSE_EOF;
 278                 if (slot == 0)
 279                         break;
 280                 ds = (struct msdos_dir_slot *)*de;
 281                 if (ds->attr != ATTR_EXT)
 282                         return PARSE_NOT_LONGNAME;
 283                 if ((ds->id & ~0x40) != slot)
 284                         goto parse_long;
 285                 if (ds->alias_checksum != alias_checksum)
 286                         goto parse_long;
 287         }
 288         if ((*de)->name[0] == DELETED_FLAG)
 289                 return PARSE_INVALID;
 290         if ((*de)->attr == ATTR_EXT)
 291                 goto parse_long;
 292         if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME))
 293                 return PARSE_INVALID;
 294         if (fat_checksum((*de)->name) != alias_checksum)
 295                 *nr_slots = 0;
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * Return values: negative -> error, 0 -> not found, positive -> found,
 302  * value is the total amount of slots, including the shortname entry.
 303  */
 304 int fat_search_long(struct inode *inode, const unsigned char *name,
 305                     int name_len, struct fat_slot_info *sinfo)
 306 {
 307         struct super_block *sb = inode->i_sb;
 308         struct msdos_sb_info *sbi = MSDOS_SB(sb);
 309         struct buffer_head *bh = NULL;
 310         struct msdos_dir_entry *de;
 311         struct nls_table *nls_io = sbi->nls_io;
 312         struct nls_table *nls_disk = sbi->nls_disk;
 313         wchar_t bufuname[14];
 314         unsigned char xlate_len, nr_slots;
 315         wchar_t *unicode = NULL;
 316         unsigned char work[8], bufname[260];    /* 256 + 4 */
 317         int uni_xlate = sbi->options.unicode_xlate;
 318         int utf8 = sbi->options.utf8;
 319         int anycase = (sbi->options.name_check != 's');
 320         unsigned short opt_shortname = sbi->options.shortname;
 321         loff_t cpos = 0;
 322         int chl, i, j, last_u, err;
 323
 324         err = -ENOENT;
 325         while(1) {
 326                 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
 327                         goto EODir;
 328 parse_record:
 329                 nr_slots = 0;
 330                 if (de->name[0] == DELETED_FLAG)
 331                         continue;
 332                 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
 333                         continue;
 334                 if (de->attr != ATTR_EXT && IS_FREE(de->name))
 335                         continue;
 336                 if (de->attr == ATTR_EXT) {
 337                         int status = fat_parse_long(inode, &cpos, &bh, &de,
 338                                                     &unicode, &nr_slots);
 339                         if (status < 0)
 340                                 return status;
 341                         else if (status == PARSE_INVALID)
 342                                 continue;
 343                         else if (status == PARSE_NOT_LONGNAME)
 344                                 goto parse_record;
 345                         else if (status == PARSE_EOF)
 346                                 goto EODir;
 347                 }
 348
 349                 memcpy(work, de->name, sizeof(de->name));
 350                 /* see namei.c, msdos_format_name */
 351                 if (work[0] == 0x05)
 352                         work[0] = 0xE5;
 353                 for (i = 0, j = 0, last_u = 0; i < 8;) {
 354                         if (!work[i]) break;
 355                         chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
 356                                                 &bufuname[j++], opt_shortname,
 357                                                 de->lcase & CASE_LOWER_BASE);
 358                         if (chl <= 1) {
 359                                 if (work[i] != ' ')
 360                                         last_u = j;
 361                         } else {
 362                                 last_u = j;
 363                         }
 364                         i += chl;
 365                 }
 366                 j = last_u;
 367                 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
 368                 for (i = 0; i < 3;) {
 369                         if (!de->ext[i]) break;
 370                         chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
 371                                                 &bufuname[j++], opt_shortname,
 372                                                 de->lcase & CASE_LOWER_EXT);
 373                         if (chl <= 1) {
 374                                 if (de->ext[i] != ' ')
 375                                         last_u = j;
 376                         } else {
 377                                 last_u = j;
 378                         }
 379                         i += chl;
 380                 }
 381                 if (!last_u)
 382                         continue;
 383
 384                 bufuname[last_u] = 0x0000;
 385                 xlate_len = utf8
 386                         ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
 387                         :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
 388                 if (xlate_len == name_len)
 389                         if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
 390                             (anycase && !nls_strnicmp(nls_io, name, bufname,
 391                                                                 xlate_len)))
 392                                 goto Found;
 393
 394                 if (nr_slots) {
 395                         xlate_len = utf8
 396                                 ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
 397                                 :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
 398                         if (xlate_len != name_len)
 399                                 continue;
 400                         if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
 401                             (anycase && !nls_strnicmp(nls_io, name, bufname,
 402                                                                 xlate_len)))
 403                                 goto Found;
 404                 }
 405         }
 406
 407 Found:
 408         nr_slots++;     /* include the de */
 409         sinfo->slot_off = cpos - nr_slots * sizeof(*de);
 410         sinfo->nr_slots = nr_slots;
 411         sinfo->de = de;
 412         sinfo->bh = bh;
 413         sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
 414         err = 0;
 415 EODir:
 416         if (unicode)
 417                 free_page((unsigned long)unicode);
 418
 419         return err;
 420 }
 421
 422 EXPORT_SYMBOL_GPL(fat_search_long);
 423
 424 struct fat_ioctl_filldir_callback {
 425         struct dirent __user *dirent;
 426         int result;
 427         /* for dir ioctl */
 428         const char *longname;
 429         int long_len;
 430         const char *shortname;
 431         int short_len;
 432 };
 433
 434 static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent,
 435                          filldir_t filldir, int short_only, int both)
 436 {
 437         struct super_block *sb = inode->i_sb;
 438         struct msdos_sb_info *sbi = MSDOS_SB(sb);
 439         struct buffer_head *bh;
 440         struct msdos_dir_entry *de;
 441         struct nls_table *nls_io = sbi->nls_io;
 442         struct nls_table *nls_disk = sbi->nls_disk;
 443         unsigned char long_slots;
 444         const char *fill_name;
 445         int fill_len;
 446         wchar_t bufuname[14];
 447         wchar_t *unicode = NULL;
 448         unsigned char c, work[8], bufname[56], *ptname = bufname;
 449         unsigned long lpos, dummy, *furrfu = &lpos;
 450         int uni_xlate = sbi->options.unicode_xlate;
 451         int isvfat = sbi->options.isvfat;
 452         int utf8 = sbi->options.utf8;
 453         int nocase = sbi->options.nocase;
 454         unsigned short opt_shortname = sbi->options.shortname;
 455         unsigned long inum;
 456         int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
 457         loff_t cpos;
 458         int ret = 0;
 459
 460         lock_kernel();
 461
 462         cpos = filp->f_pos;
 463         /* Fake . and .. for the root directory. */
 464         if (inode->i_ino == MSDOS_ROOT_INO) {
 465                 while (cpos < 2) {
 466                         if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
 467                                 goto out;
 468                         cpos++;
 469                         filp->f_pos++;
 470                 }
 471                 if (cpos == 2) {
 472                         dummy = 2;
 473                         furrfu = &dummy;
 474                         cpos = 0;
 475                 }
 476         }
 477         if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
 478                 ret = -ENOENT;
 479                 goto out;
 480         }
 481
 482         bh = NULL;
 483 GetNew:
 484         if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
 485                 goto EODir;
 486 parse_record:
 487         long_slots = 0;
 488         /* Check for long filename entry */
 489         if (isvfat) {
 490                 if (de->name[0] == DELETED_FLAG)
 491                         goto RecEnd;
 492                 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
 493                         goto RecEnd;
 494                 if (de->attr != ATTR_EXT && IS_FREE(de->name))
 495                         goto RecEnd;
 496         } else {
 497                 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
 498                         goto RecEnd;
 499         }
 500
 501         if (isvfat && de->attr == ATTR_EXT) {
 502                 int status = fat_parse_long(inode, &cpos, &bh, &de,
 503                                             &unicode, &long_slots);
 504                 if (status < 0) {
 505                         filp->f_pos = cpos;
 506                         ret = status;
 507                         goto out;
 508                 } else if (status == PARSE_INVALID)
 509                         goto RecEnd;
 510                 else if (status == PARSE_NOT_LONGNAME)
 511                         goto parse_record;
 512                 else if (status == PARSE_EOF)
 513                         goto EODir;
 514         }
 515
 516         if (sbi->options.dotsOK) {
 517                 ptname = bufname;
 518                 dotoffset = 0;
 519                 if (de->attr & ATTR_HIDDEN) {
 520                         *ptname++ = '.';
 521                         dotoffset = 1;
 522                 }
 523         }
 524
 525         memcpy(work, de->name, sizeof(de->name));
 526         /* see namei.c, msdos_format_name */
 527         if (work[0] == 0x05)
 528                 work[0] = 0xE5;
 529         for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
 530                 if (!(c = work[i])) break;
 531                 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
 532                                         &bufuname[j++], opt_shortname,
 533                                         de->lcase & CASE_LOWER_BASE);
 534                 if (chl <= 1) {
 535                         ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
 536                         if (c != ' ') {
 537                                 last = i;
 538                                 last_u = j;
 539                         }
 540                 } else {
 541                         last_u = j;
 542                         for (chi = 0; chi < chl && i < 8; chi++) {
 543                                 ptname[i] = work[i];
 544                                 i++; last = i;
 545                         }
 546                 }
 547         }
 548         i = last;
 549         j = last_u;
 550         fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
 551         ptname[i++] = '.';
 552         for (i2 = 0; i2 < 3;) {
 553                 if (!(c = de->ext[i2])) break;
 554                 chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
 555                                         &bufuname[j++], opt_shortname,
 556                                         de->lcase & CASE_LOWER_EXT);
 557                 if (chl <= 1) {
 558                         i2++;
 559                         ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
 560                         if (c != ' ') {
 561                                 last = i;
 562                                 last_u = j;
 563                         }
 564                 } else {
 565                         last_u = j;
 566                         for (chi = 0; chi < chl && i2 < 3; chi++) {
 567                                 ptname[i++] = de->ext[i2++];
 568                                 last = i;
 569                         }
 570                 }
 571         }
 572         if (!last)
 573                 goto RecEnd;
 574
 575         i = last + dotoffset;
 576         j = last_u;
 577
 578         lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
 579         if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
 580                 inum = inode->i_ino;
 581         else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 582                 inum = parent_ino(filp->f_dentry);
 583         } else {
 584                 loff_t i_pos = fat_make_i_pos(sb, bh, de);
 585                 struct inode *tmp = fat_iget(sb, i_pos);
 586                 if (tmp) {
 587                         inum = tmp->i_ino;
 588                         iput(tmp);
 589                 } else
 590                         inum = iunique(sb, MSDOS_ROOT_INO);
 591         }
 592
 593         if (isvfat) {
 594                 bufuname[j] = 0x0000;
 595                 i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
 596                          : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
 597         }
 598
 599         fill_name = bufname;
 600         fill_len = i;
 601         if (!short_only && long_slots) {
 602                 /* convert the unicode long name. 261 is maximum size
 603                  * of unicode buffer. (13 * slots + nul) */
 604                 void *longname = unicode + 261;
 605                 int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
 606                 int long_len = utf8
 607                         ? utf8_wcstombs(longname, unicode, buf_size)
 608                         : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
 609
 610                 if (!both) {
 611                         fill_name = longname;
 612                         fill_len = long_len;
 613                 } else {
 614                         /* hack for fat_ioctl_filldir() */
 615                         struct fat_ioctl_filldir_callback *p = dirent;
 616
 617                         p->longname = longname;
 618                         p->long_len = long_len;
 619                         p->shortname = bufname;
 620                         p->short_len = i;
 621                         fill_name = NULL;
 622                         fill_len = 0;
 623                 }
 624         }
 625         if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
 626                     (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
 627                 goto FillFailed;
 628
 629 RecEnd:
 630         furrfu = &lpos;
 631         filp->f_pos = cpos;
 632         goto GetNew;
 633 EODir:
 634         filp->f_pos = cpos;
 635 FillFailed:
 636         brelse(bh);
 637         if (unicode)
 638                 free_page((unsigned long)unicode);
 639 out:
 640         unlock_kernel();
 641         return ret;
 642 }
 643
 644 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
 645 {
 646         struct inode *inode = filp->f_dentry->d_inode;
 647         return __fat_readdir(inode, filp, dirent, filldir, 0, 0);
 648 }
 649
 650 static int fat_ioctl_filldir(void *__buf, const char *name, int name_len,
 651                              loff_t offset, u64 ino, unsigned int d_type)
 652 {
 653         struct fat_ioctl_filldir_callback *buf = __buf;
 654         struct dirent __user *d1 = buf->dirent;
 655         struct dirent __user *d2 = d1 + 1;
 656
 657         if (buf->result)
 658                 return -EINVAL;
 659         buf->result++;
 660
 661         if (name != NULL) {
 662                 /* dirent has only short name */
 663                 if (name_len >= sizeof(d1->d_name))
 664                         name_len = sizeof(d1->d_name) - 1;
 665
 666                 if (put_user(0, d2->d_name)                     ||
 667                     put_user(0, &d2->d_reclen)                  ||
 668                     copy_to_user(d1->d_name, name, name_len)    ||
 669                     put_user(0, d1->d_name + name_len)          ||
 670                     put_user(name_len, &d1->d_reclen))
 671                         goto efault;
 672         } else {
 673                 /* dirent has short and long name */
 674                 const char *longname = buf->longname;
 675                 int long_len = buf->long_len;
 676                 const char *shortname = buf->shortname;
 677                 int short_len = buf->short_len;
 678
 679                 if (long_len >= sizeof(d1->d_name))
 680                         long_len = sizeof(d1->d_name) - 1;
 681                 if (short_len >= sizeof(d1->d_name))
 682                         short_len = sizeof(d1->d_name) - 1;
 683
 684                 if (copy_to_user(d2->d_name, longname, long_len)        ||
 685                     put_user(0, d2->d_name + long_len)                  ||
 686                     put_user(long_len, &d2->d_reclen)                   ||
 687                     put_user(ino, &d2->d_ino)                           ||
 688                     put_user(offset, &d2->d_off)                        ||
 689                     copy_to_user(d1->d_name, shortname, short_len)      ||
 690                     put_user(0, d1->d_name + short_len)                 ||
 691                     put_user(short_len, &d1->d_reclen))
 692                         goto efault;
 693         }
 694         return 0;
 695 efault:
 696         buf->result = -EFAULT;
 697         return -EFAULT;
 698 }
 699
 700 static int fat_dir_ioctl(struct inode * inode, struct file * filp,
 701                   unsigned int cmd, unsigned long arg)
 702 {
 703         struct fat_ioctl_filldir_callback buf;
 704         struct dirent __user *d1;
 705         int ret, short_only, both;
 706
 707         switch (cmd) {
 708         case VFAT_IOCTL_READDIR_SHORT:
 709                 short_only = 1;
 710                 both = 0;
 711                 break;
 712         case VFAT_IOCTL_READDIR_BOTH:
 713                 short_only = 0;
 714                 both = 1;
 715                 break;
 716         default:
 717                 return fat_generic_ioctl(inode, filp, cmd, arg);
 718         }
 719
 720         d1 = (struct dirent __user *)arg;
 721         if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
 722                 return -EFAULT;
 723         /*
 724          * Yes, we don't need this put_user() absolutely. However old
 725          * code didn't return the right value. So, app use this value,
 726          * in order to check whether it is EOF.
 727          */
 728         if (put_user(0, &d1->d_reclen))
 729                 return -EFAULT;
 730
 731         buf.dirent = d1;
 732         buf.result = 0;
 733         mutex_lock(&inode->i_mutex);
 734         ret = -ENOENT;
 735         if (!IS_DEADDIR(inode)) {
 736                 ret = __fat_readdir(inode, filp, &buf, fat_ioctl_filldir,
 737                                     short_only, both);
 738         }
 739         mutex_unlock(&inode->i_mutex);
 740         if (ret >= 0)
 741                 ret = buf.result;
 742         return ret;
 743 }
 744
 745 #ifdef CONFIG_COMPAT
 746 #define VFAT_IOCTL_READDIR_BOTH32       _IOR('r', 1, struct compat_dirent[2])
 747 #define VFAT_IOCTL_READDIR_SHORT32      _IOR('r', 2, struct compat_dirent[2])
 748
 749 static long fat_compat_put_dirent32(struct dirent *d,
 750                                     struct compat_dirent __user *d32)
 751 {
 752         if (!access_ok(VERIFY_WRITE, d32, sizeof(struct compat_dirent)))
 753                 return -EFAULT;
 754
 755         __put_user(d->d_ino, &d32->d_ino);
 756         __put_user(d->d_off, &d32->d_off);
 757         __put_user(d->d_reclen, &d32->d_reclen);
 758         if (__copy_to_user(d32->d_name, d->d_name, d->d_reclen))
 759                 return -EFAULT;
 760
 761         return 0;
 762 }
 763
 764 static long fat_compat_dir_ioctl(struct file *file, unsigned cmd,
 765                                  unsigned long arg)
 766 {
 767         struct compat_dirent __user *p = compat_ptr(arg);
 768         int ret;
 769         mm_segment_t oldfs = get_fs();
 770         struct dirent d[2];
 771
 772         switch (cmd) {
 773         case VFAT_IOCTL_READDIR_BOTH32:
 774                 cmd = VFAT_IOCTL_READDIR_BOTH;
 775                 break;
 776         case VFAT_IOCTL_READDIR_SHORT32:
 777                 cmd = VFAT_IOCTL_READDIR_SHORT;
 778                 break;
 779         default:
 780                 return -ENOIOCTLCMD;
 781         }
 782
 783         set_fs(KERNEL_DS);
 784         lock_kernel();
 785         ret = fat_dir_ioctl(file->f_dentry->d_inode, file,
 786                             cmd, (unsigned long) &d);
 787         unlock_kernel();
 788         set_fs(oldfs);
 789         if (ret >= 0) {
 790                 ret |= fat_compat_put_dirent32(&d[0], p);
 791                 ret |= fat_compat_put_dirent32(&d[1], p + 1);
 792         }
 793         return ret;
 794 }
 795 #endif /* CONFIG_COMPAT */
 796
 797 const struct file_operations fat_dir_operations = {
 798         .read           = generic_read_dir,
 799         .readdir        = fat_readdir,
 800         .ioctl          = fat_dir_ioctl,
 801 #ifdef CONFIG_COMPAT
 802         .compat_ioctl   = fat_compat_dir_ioctl,
 803 #endif
 804         .fsync          = file_fsync,
 805 };
 806
 807 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
 808                                struct buffer_head **bh,
 809                                struct msdos_dir_entry **de)
 810 {
 811         while (fat_get_entry(dir, pos, bh, de) >= 0) {
 812                 /* free entry or long name entry or volume label */
 813                 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
 814                         return 0;
 815         }
 816         return -ENOENT;
 817 }
 818
 819 /*
 820  * The ".." entry can not provide the "struct fat_slot_info" informations
 821  * for inode. So, this function provide the some informations only.
 822  */
 823 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
 824                          struct msdos_dir_entry **de, loff_t *i_pos)
 825 {
 826         loff_t offset;
 827
 828         offset = 0;
 829         *bh = NULL;
 830         while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
 831                 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 832                         *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
 833                         return 0;
 834                 }
 835         }
 836         return -ENOENT;
 837 }
 838
 839 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
 840
 841 /* See if directory is empty */
 842 int fat_dir_empty(struct inode *dir)
 843 {
 844         struct buffer_head *bh;
 845         struct msdos_dir_entry *de;
 846         loff_t cpos;
 847         int result = 0;
 848
 849         bh = NULL;
 850         cpos = 0;
 851         while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
 852                 if (strncmp(de->name, MSDOS_DOT   , MSDOS_NAME) &&
 853                     strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
 854                         result = -ENOTEMPTY;
 855                         break;
 856                 }
 857         }
 858         brelse(bh);
 859         return result;
 860 }
 861
 862 EXPORT_SYMBOL_GPL(fat_dir_empty);
 863
 864 /*
 865  * fat_subdirs counts the number of sub-directories of dir. It can be run
 866  * on directories being created.
 867  */
 868 int fat_subdirs(struct inode *dir)
 869 {
 870         struct buffer_head *bh;
 871         struct msdos_dir_entry *de;
 872         loff_t cpos;
 873         int count = 0;
 874
 875         bh = NULL;
 876         cpos = 0;
 877         while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
 878                 if (de->attr & ATTR_DIR)
 879                         count++;
 880         }
 881         brelse(bh);
 882         return count;
 883 }
 884
 885 /*
 886  * Scans a directory for a given file (name points to its formatted name).
 887  * Returns an error code or zero.
 888  */
 889 int fat_scan(struct inode *dir, const unsigned char *name,
 890              struct fat_slot_info *sinfo)
 891 {
 892         struct super_block *sb = dir->i_sb;
 893
 894         sinfo->slot_off = 0;
 895         sinfo->bh = NULL;
 896         while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
 897                                    &sinfo->de) >= 0) {
 898                 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
 899                         sinfo->slot_off -= sizeof(*sinfo->de);
 900                         sinfo->nr_slots = 1;
 901                         sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
 902                         return 0;
 903                 }
 904         }
 905         return -ENOENT;
 906 }
 907
 908 EXPORT_SYMBOL_GPL(fat_scan);
 909
 910 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
 911 {
 912         struct super_block *sb = dir->i_sb;
 913         struct buffer_head *bh;
 914         struct msdos_dir_entry *de, *endp;
 915         int err = 0, orig_slots;
 916
 917         while (nr_slots) {
 918                 bh = NULL;
 919                 if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
 920                         err = -EIO;
 921                         break;
 922                 }
 923
 924                 orig_slots = nr_slots;
 925                 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
 926                 while (nr_slots && de < endp) {
 927                         de->name[0] = DELETED_FLAG;
 928                         de++;
 929                         nr_slots--;
 930                 }
 931                 mark_buffer_dirty(bh);
 932                 if (IS_DIRSYNC(dir))
 933                         err = sync_dirty_buffer(bh);
 934                 brelse(bh);
 935                 if (err)
 936                         break;
 937
 938                 /* pos is *next* de's position, so this does `- sizeof(de)' */
 939                 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
 940         }
 941
 942         return err;
 943 }
 944
 945 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
 946 {
 947         struct msdos_dir_entry *de;
 948         struct buffer_head *bh;
 949         int err = 0, nr_slots;
 950
 951         /*
 952          * First stage: Remove the shortname. By this, the directory
 953          * entry is removed.
 954          */
 955         nr_slots = sinfo->nr_slots;
 956         de = sinfo->de;
 957         sinfo->de = NULL;
 958         bh = sinfo->bh;
 959         sinfo->bh = NULL;
 960         while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
 961                 de->name[0] = DELETED_FLAG;
 962                 de--;
 963                 nr_slots--;
 964         }
 965         mark_buffer_dirty(bh);
 966         if (IS_DIRSYNC(dir))
 967                 err = sync_dirty_buffer(bh);
 968         brelse(bh);
 969         if (err)
 970                 return err;
 971         dir->i_version++;
 972
 973         if (nr_slots) {
 974                 /*
 975                  * Second stage: remove the remaining longname slots.
 976                  * (This directory entry is already removed, and so return
 977                  * the success)
 978                  */
 979                 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
 980                 if (err) {
 981                         printk(KERN_WARNING
 982                                "FAT: Couldn't remove the long name slots\n");
 983                 }
 984         }
 985
 986         dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
 987         if (IS_DIRSYNC(dir))
 988                 (void)fat_sync_inode(dir);
 989         else
 990                 mark_inode_dirty(dir);
 991
 992         return 0;
 993 }
 994
 995 EXPORT_SYMBOL_GPL(fat_remove_entries);
 996
 997 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
 998                               struct buffer_head **bhs, int nr_bhs)
 999 {
1000         struct super_block *sb = dir->i_sb;
1001         sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
1002         int err, i, n;
1003
1004         /* Zeroing the unused blocks on this cluster */
1005         blknr += nr_used;
1006         n = nr_used;
1007         while (blknr < last_blknr) {
1008                 bhs[n] = sb_getblk(sb, blknr);
1009                 if (!bhs[n]) {
1010                         err = -ENOMEM;
1011                         goto error;
1012                 }
1013                 memset(bhs[n]->b_data, 0, sb->s_blocksize);
1014                 set_buffer_uptodate(bhs[n]);
1015                 mark_buffer_dirty(bhs[n]);
1016
1017                 n++;
1018                 blknr++;
1019                 if (n == nr_bhs) {
1020                         if (IS_DIRSYNC(dir)) {
1021                                 err = fat_sync_bhs(bhs, n);
1022                                 if (err)
1023                                         goto error;
1024                         }
1025                         for (i = 0; i < n; i++)
1026                                 brelse(bhs[i]);
1027                         n = 0;
1028                 }
1029         }
1030         if (IS_DIRSYNC(dir)) {
1031                 err = fat_sync_bhs(bhs, n);
1032                 if (err)
1033                         goto error;
1034         }
1035         for (i = 0; i < n; i++)
1036                 brelse(bhs[i]);
1037
1038         return 0;
1039
1040 error:
1041         for (i = 0; i < n; i++)
1042                 bforget(bhs[i]);
1043         return err;
1044 }
1045
1046 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
1047 {
1048         struct super_block *sb = dir->i_sb;
1049         struct msdos_sb_info *sbi = MSDOS_SB(sb);
1050         struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1051         struct msdos_dir_entry *de;
1052         sector_t blknr;
1053         __le16 date, time;
1054         int err, cluster;
1055
1056         err = fat_alloc_clusters(dir, &cluster, 1);
1057         if (err)
1058                 goto error;
1059
1060         blknr = fat_clus_to_blknr(sbi, cluster);
1061         bhs[0] = sb_getblk(sb, blknr);
1062         if (!bhs[0]) {
1063                 err = -ENOMEM;
1064                 goto error_free;
1065         }
1066
1067         fat_date_unix2dos(ts->tv_sec, &time, &date);
1068
1069         de = (struct msdos_dir_entry *)bhs[0]->b_data;
1070         /* filling the new directory slots ("." and ".." entries) */
1071         memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
1072         memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
1073         de->attr = de[1].attr = ATTR_DIR;
1074         de[0].lcase = de[1].lcase = 0;
1075         de[0].time = de[1].time = time;
1076         de[0].date = de[1].date = date;
1077         de[0].ctime_cs = de[1].ctime_cs = 0;
1078         if (sbi->options.isvfat) {
1079                 /* extra timestamps */
1080                 de[0].ctime = de[1].ctime = time;
1081                 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
1082         } else {
1083                 de[0].ctime = de[1].ctime = 0;
1084                 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
1085         }
1086         de[0].start = cpu_to_le16(cluster);
1087         de[0].starthi = cpu_to_le16(cluster >> 16);
1088         de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
1089         de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
1090         de[0].size = de[1].size = 0;
1091         memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
1092         set_buffer_uptodate(bhs[0]);
1093         mark_buffer_dirty(bhs[0]);
1094
1095         err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
1096         if (err)
1097                 goto error_free;
1098
1099         return cluster;
1100
1101 error_free:
1102         fat_free_clusters(dir, cluster);
1103 error:
1104         return err;
1105 }
1106
1107 EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
1108
1109 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
1110                                int *nr_cluster, struct msdos_dir_entry **de,
1111                                struct buffer_head **bh, loff_t *i_pos)
1112 {
1113         struct super_block *sb = dir->i_sb;
1114         struct msdos_sb_info *sbi = MSDOS_SB(sb);
1115         struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1116         sector_t blknr, start_blknr, last_blknr;
1117         unsigned long size, copy;
1118         int err, i, n, offset, cluster[2];
1119
1120         /*
1121          * The minimum cluster size is 512bytes, and maximum entry
1122          * size is 32*slots (672bytes).  So, iff the cluster size is
1123          * 512bytes, we may need two clusters.
1124          */
1125         size = nr_slots * sizeof(struct msdos_dir_entry);
1126         *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
1127         BUG_ON(*nr_cluster > 2);
1128
1129         err = fat_alloc_clusters(dir, cluster, *nr_cluster);
1130         if (err)
1131                 goto error;
1132
1133         /*
1134          * First stage: Fill the directory entry.  NOTE: This cluster
1135          * is not referenced from any inode yet, so updates order is
1136          * not important.
1137          */
1138         i = n = copy = 0;
1139         do {
1140                 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
1141                 last_blknr = start_blknr + sbi->sec_per_clus;
1142                 while (blknr < last_blknr) {
1143                         bhs[n] = sb_getblk(sb, blknr);
1144                         if (!bhs[n]) {
1145                                 err = -ENOMEM;
1146                                 goto error_nomem;
1147                         }
1148
1149                         /* fill the directory entry */
1150                         copy = min(size, sb->s_blocksize);
1151                         memcpy(bhs[n]->b_data, slots, copy);
1152                         slots += copy;
1153                         size -= copy;
1154                         set_buffer_uptodate(bhs[n]);
1155                         mark_buffer_dirty(bhs[n]);
1156                         if (!size)
1157                                 break;
1158                         n++;
1159                         blknr++;
1160                 }
1161         } while (++i < *nr_cluster);
1162
1163         memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
1164         offset = copy - sizeof(struct msdos_dir_entry);
1165         get_bh(bhs[n]);
1166         *bh = bhs[n];
1167         *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
1168         *i_pos = fat_make_i_pos(sb, *bh, *de);
1169
1170         /* Second stage: clear the rest of cluster, and write outs */
1171         err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
1172         if (err)
1173                 goto error_free;
1174
1175         return cluster[0];
1176
1177 error_free:
1178         brelse(*bh);
1179         *bh = NULL;
1180         n = 0;
1181 error_nomem:
1182         for (i = 0; i < n; i++)
1183                 bforget(bhs[i]);
1184         fat_free_clusters(dir, cluster[0]);
1185 error:
1186         return err;
1187 }
1188
1189 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
1190                     struct fat_slot_info *sinfo)
1191 {
1192         struct super_block *sb = dir->i_sb;
1193         struct msdos_sb_info *sbi = MSDOS_SB(sb);
1194         struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
1195         struct msdos_dir_entry *de;
1196         int err, free_slots, i, nr_bhs;
1197         loff_t pos, i_pos;
1198
1199         sinfo->nr_slots = nr_slots;
1200
1201         /* First stage: search free direcotry entries */
1202         free_slots = nr_bhs = 0;
1203         bh = prev = NULL;
1204         pos = 0;
1205         err = -ENOSPC;
1206         while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
1207                 /* check the maximum size of directory */
1208                 if (pos >= FAT_MAX_DIR_SIZE)
1209                         goto error;
1210
1211                 if (IS_FREE(de->name)) {
1212                         if (prev != bh) {
1213                                 get_bh(bh);
1214                                 bhs[nr_bhs] = prev = bh;
1215                                 nr_bhs++;
1216                         }
1217                         free_slots++;
1218                         if (free_slots == nr_slots)
1219                                 goto found;
1220                 } else {
1221                         for (i = 0; i < nr_bhs; i++)
1222                                 brelse(bhs[i]);
1223                         prev = NULL;
1224                         free_slots = nr_bhs = 0;
1225                 }
1226         }
1227         if (dir->i_ino == MSDOS_ROOT_INO) {
1228                 if (sbi->fat_bits != 32)
1229                         goto error;
1230         } else if (MSDOS_I(dir)->i_start == 0) {
1231                 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
1232                        MSDOS_I(dir)->i_pos);
1233                 err = -EIO;
1234                 goto error;
1235         }
1236
1237 found:
1238         err = 0;
1239         pos -= free_slots * sizeof(*de);
1240         nr_slots -= free_slots;
1241         if (free_slots) {
1242                 /*
1243                  * Second stage: filling the free entries with new entries.
1244                  * NOTE: If this slots has shortname, first, we write
1245                  * the long name slots, then write the short name.
1246                  */
1247                 int size = free_slots * sizeof(*de);
1248                 int offset = pos & (sb->s_blocksize - 1);
1249                 int long_bhs = nr_bhs - (nr_slots == 0);
1250
1251                 /* Fill the long name slots. */
1252                 for (i = 0; i < long_bhs; i++) {
1253                         int copy = min_t(int, sb->s_blocksize - offset, size);
1254                         memcpy(bhs[i]->b_data + offset, slots, copy);
1255                         mark_buffer_dirty(bhs[i]);
1256                         offset = 0;
1257                         slots += copy;
1258                         size -= copy;
1259                 }
1260                 if (long_bhs && IS_DIRSYNC(dir))
1261                         err = fat_sync_bhs(bhs, long_bhs);
1262                 if (!err && i < nr_bhs) {
1263                         /* Fill the short name slot. */
1264                         int copy = min_t(int, sb->s_blocksize - offset, size);
1265                         memcpy(bhs[i]->b_data + offset, slots, copy);
1266                         mark_buffer_dirty(bhs[i]);
1267                         if (IS_DIRSYNC(dir))
1268                                 err = sync_dirty_buffer(bhs[i]);
1269                 }
1270                 for (i = 0; i < nr_bhs; i++)
1271                         brelse(bhs[i]);
1272                 if (err)
1273                         goto error_remove;
1274         }
1275
1276         if (nr_slots) {
1277                 int cluster, nr_cluster;
1278
1279                 /*
1280                  * Third stage: allocate the cluster for new entries.
1281                  * And initialize the cluster with new entries, then
1282                  * add the cluster to dir.
1283                  */
1284                 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
1285                                               &de, &bh, &i_pos);
1286                 if (cluster < 0) {
1287                         err = cluster;
1288                         goto error_remove;
1289                 }
1290                 err = fat_chain_add(dir, cluster, nr_cluster);
1291                 if (err) {
1292                         fat_free_clusters(dir, cluster);
1293                         goto error_remove;
1294                 }
1295                 if (dir->i_size & (sbi->cluster_size - 1)) {
1296                         fat_fs_panic(sb, "Odd directory size");
1297                         dir->i_size = (dir->i_size + sbi->cluster_size - 1)
1298                                 & ~((loff_t)sbi->cluster_size - 1);
1299                 }
1300                 dir->i_size += nr_cluster << sbi->cluster_bits;
1301                 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
1302         }
1303         sinfo->slot_off = pos;
1304         sinfo->de = de;
1305         sinfo->bh = bh;
1306         sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
1307
1308         return 0;
1309
1310 error:
1311         brelse(bh);
1312         for (i = 0; i < nr_bhs; i++)
1313                 brelse(bhs[i]);
1314         return err;
1315
1316 error_remove:
1317         brelse(bh);
1318         if (free_slots)
1319                 __fat_remove_entries(dir, pos, free_slots);
1320         return err;
1321 }
1322
1323 EXPORT_SYMBOL_GPL(fat_add_entries);