Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David Howells | 188f83d | 2006-08-31 12:50:04 +0200 | [diff] [blame] | 23 | #include <linux/compat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Karsten Wiese | f3ef6f6 | 2005-09-06 15:17:12 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 83b7c99 | 2006-01-08 01:02:09 -0800 | [diff] [blame] | 49 | bh = sb_find_get_block(sb, phys); |
| 50 | if (bh == NULL || !buffer_uptodate(bh)) { |
Karsten Wiese | f3ef6f6 | 2005-09-06 15:17:12 -0700 | [diff] [blame] | 51 | for (sec = 0; sec < sbi->sec_per_clus; sec++) |
| 52 | sb_breadahead(sb, phys + sec); |
| 53 | } |
| 54 | brelse(bh); |
| 55 | } |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 72 | unsigned long mapped_blocks; |
| 73 | int err, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | next: |
| 76 | if (*bh) |
| 77 | brelse(*bh); |
| 78 | |
| 79 | *bh = NULL; |
| 80 | iblock = *pos >> sb->s_blocksize_bits; |
OGAWA Hirofumi | e5174ba | 2006-01-08 01:02:11 -0800 | [diff] [blame] | 81 | err = fat_bmap(dir, iblock, &phys, &mapped_blocks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | if (err || !phys) |
| 83 | return -1; /* beyond EOF or error */ |
| 84 | |
Karsten Wiese | f3ef6f6 | 2005-09-06 15:17:12 -0700 | [diff] [blame] | 85 | fat_dir_readahead(dir, iblock, phys); |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | /* |
Alexey Dobriyan | 4de151d | 2006-03-22 00:13:35 +0100 | [diff] [blame] | 118 | * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | continue; |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 343 | else if (status == PARSE_NOT_LONGNAME) |
| 344 | goto parse_record; |
| 345 | else if (status == PARSE_EOF) |
| 346 | goto EODir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 422 | EXPORT_SYMBOL_GPL(fat_search_long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 434 | static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, |
| 435 | filldir_t filldir, int short_only, int both) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
| 485 | goto EODir; |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 486 | parse_record: |
| 487 | long_slots = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | goto RecEnd; |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 510 | else if (status == PARSE_NOT_LONGNAME) |
| 511 | goto parse_record; |
| 512 | else if (status == PARSE_EOF) |
| 513 | goto EODir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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: |
Karsten Wiese | f3ef6f6 | 2005-09-06 15:17:12 -0700 | [diff] [blame] | 636 | brelse(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 647 | return __fat_readdir(inode, filp, dirent, filldir, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | } |
| 649 | |
| 650 | static int fat_ioctl_filldir(void *__buf, const char *name, int name_len, |
David Howells | afefdbb | 2006-10-03 01:13:46 -0700 | [diff] [blame] | 651 | loff_t offset, u64 ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 733 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | ret = -ENOENT; |
| 735 | if (!IS_DEADDIR(inode)) { |
Pekka Enberg | ad2c160 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 736 | ret = __fat_readdir(inode, filp, &buf, fat_ioctl_filldir, |
| 737 | short_only, both); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 739 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | if (ret >= 0) |
| 741 | ret = buf.result; |
| 742 | return ret; |
| 743 | } |
| 744 | |
David Howells | 188f83d | 2006-08-31 12:50:04 +0200 | [diff] [blame] | 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 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 797 | const struct file_operations fat_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | .read = generic_read_dir, |
| 799 | .readdir = fat_readdir, |
| 800 | .ioctl = fat_dir_ioctl, |
David Howells | 188f83d | 2006-08-31 12:50:04 +0200 | [diff] [blame] | 801 | #ifdef CONFIG_COMPAT |
| 802 | .compat_ioctl = fat_compat_dir_ioctl, |
| 803 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 839 | EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 862 | EXPORT_SYMBOL_GPL(fat_dir_empty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 908 | EXPORT_SYMBOL_GPL(fat_scan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 995 | EXPORT_SYMBOL_GPL(fat_remove_entries); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 1107 | EXPORT_SYMBOL_GPL(fat_alloc_new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
OGAWA Hirofumi | 7c709d0 | 2006-01-08 01:02:10 -0800 | [diff] [blame] | 1323 | EXPORT_SYMBOL_GPL(fat_add_entries); |