Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/vfat/namei.c |
| 3 | * |
| 4 | * Written 1992,1993 by Werner Almesberger |
| 5 | * |
| 6 | * Windows95/Windows NT compatible extended MSDOS filesystem |
| 7 | * by Gordon Chaffee Copyright (C) 1995. Send bug reports for the |
| 8 | * VFAT filesystem to <chaffee@cs.berkeley.edu>. Specify |
| 9 | * what file operation caused you trouble and if you can duplicate |
| 10 | * the problem, send a script that demonstrates it. |
| 11 | * |
| 12 | * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de> |
| 13 | * |
| 14 | * Support Multibyte characters and cleanup by |
| 15 | * OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/ctype.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/smp_lock.h> |
| 23 | #include <linux/buffer_head.h> |
| 24 | #include <linux/namei.h> |
OGAWA Hirofumi | 9e975da | 2008-11-06 12:53:46 -0800 | [diff] [blame] | 25 | #include "fat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 27 | /* |
| 28 | * If new entry was created in the parent, it could create the 8.3 |
| 29 | * alias (the shortname of logname). So, the parent may have the |
| 30 | * negative-dentry which matches the created 8.3 alias. |
| 31 | * |
| 32 | * If it happened, the negative dentry isn't actually negative |
| 33 | * anymore. So, drop it. |
| 34 | */ |
| 35 | static int vfat_revalidate_shortname(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
| 37 | int ret = 1; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 38 | spin_lock(&dentry->d_lock); |
| 39 | if (dentry->d_time != dentry->d_parent->d_inode->i_version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | ret = 0; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 41 | spin_unlock(&dentry->d_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | return ret; |
| 43 | } |
| 44 | |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 45 | static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 46 | { |
| 47 | /* This is not negative dentry. Always valid. */ |
| 48 | if (dentry->d_inode) |
| 49 | return 1; |
| 50 | return vfat_revalidate_shortname(dentry); |
| 51 | } |
| 52 | |
| 53 | static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd) |
| 54 | { |
| 55 | /* |
| 56 | * This is not negative dentry. Always valid. |
| 57 | * |
| 58 | * Note, rename() to existing directory entry will have ->d_inode, |
| 59 | * and will use existing name which isn't specified name by user. |
| 60 | * |
| 61 | * We may be able to drop this positive dentry here. But dropping |
| 62 | * positive dentry isn't good idea. So it's unsupported like |
| 63 | * rename("filename", "FILENAME") for now. |
| 64 | */ |
| 65 | if (dentry->d_inode) |
| 66 | return 1; |
| 67 | |
| 68 | /* |
| 69 | * This may be nfsd (or something), anyway, we can't see the |
| 70 | * intent of this. So, since this can be for creation, drop it. |
| 71 | */ |
| 72 | if (!nd) |
| 73 | return 0; |
| 74 | |
| 75 | /* |
| 76 | * Drop the negative dentry, in order to make sure to use the |
| 77 | * case sensitive name which is specified by user if this is |
| 78 | * for creation. |
| 79 | */ |
| 80 | if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) { |
OGAWA Hirofumi | ebeb040 | 2008-11-12 07:48:00 +0900 | [diff] [blame] | 81 | if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | return vfat_revalidate_shortname(dentry); |
| 86 | } |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* returns the length of a struct qstr, ignoring trailing dots */ |
| 89 | static unsigned int vfat_striptail_len(struct qstr *qstr) |
| 90 | { |
| 91 | unsigned int len = qstr->len; |
| 92 | |
| 93 | while (len && qstr->name[len - 1] == '.') |
| 94 | len--; |
| 95 | return len; |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * Compute the hash for the vfat name corresponding to the dentry. |
| 100 | * Note: if the name is invalid, we leave the hash code unchanged so |
| 101 | * that the existing dentry can be used. The vfat fs routines will |
| 102 | * return ENOENT or EINVAL as appropriate. |
| 103 | */ |
| 104 | static int vfat_hash(struct dentry *dentry, struct qstr *qstr) |
| 105 | { |
| 106 | qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr)); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Compute the hash for the vfat name corresponding to the dentry. |
| 112 | * Note: if the name is invalid, we leave the hash code unchanged so |
| 113 | * that the existing dentry can be used. The vfat fs routines will |
| 114 | * return ENOENT or EINVAL as appropriate. |
| 115 | */ |
| 116 | static int vfat_hashi(struct dentry *dentry, struct qstr *qstr) |
| 117 | { |
| 118 | struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io; |
| 119 | const unsigned char *name; |
| 120 | unsigned int len; |
| 121 | unsigned long hash; |
| 122 | |
| 123 | name = qstr->name; |
| 124 | len = vfat_striptail_len(qstr); |
| 125 | |
| 126 | hash = init_name_hash(); |
| 127 | while (len--) |
| 128 | hash = partial_name_hash(nls_tolower(t, *name++), hash); |
| 129 | qstr->hash = end_name_hash(hash); |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Case insensitive compare of two vfat names. |
| 136 | */ |
| 137 | static int vfat_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b) |
| 138 | { |
| 139 | struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io; |
| 140 | unsigned int alen, blen; |
| 141 | |
| 142 | /* A filename cannot end in '.' or we treat it like it has none */ |
| 143 | alen = vfat_striptail_len(a); |
| 144 | blen = vfat_striptail_len(b); |
| 145 | if (alen == blen) { |
| 146 | if (nls_strnicmp(t, a->name, b->name, alen) == 0) |
| 147 | return 0; |
| 148 | } |
| 149 | return 1; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Case sensitive compare of two vfat names. |
| 154 | */ |
| 155 | static int vfat_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b) |
| 156 | { |
| 157 | unsigned int alen, blen; |
| 158 | |
| 159 | /* A filename cannot end in '.' or we treat it like it has none */ |
| 160 | alen = vfat_striptail_len(a); |
| 161 | blen = vfat_striptail_len(b); |
| 162 | if (alen == blen) { |
| 163 | if (strncmp(a->name, b->name, alen) == 0) |
| 164 | return 0; |
| 165 | } |
| 166 | return 1; |
| 167 | } |
| 168 | |
Al Viro | ce6cdc4 | 2009-02-20 05:59:46 +0000 | [diff] [blame] | 169 | static const struct dentry_operations vfat_ci_dentry_ops = { |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 170 | .d_revalidate = vfat_revalidate_ci, |
| 171 | .d_hash = vfat_hashi, |
| 172 | .d_compare = vfat_cmpi, |
| 173 | }; |
| 174 | |
Al Viro | ce6cdc4 | 2009-02-20 05:59:46 +0000 | [diff] [blame] | 175 | static const struct dentry_operations vfat_dentry_ops = { |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 176 | .d_revalidate = vfat_revalidate, |
| 177 | .d_hash = vfat_hash, |
| 178 | .d_compare = vfat_cmp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | }; |
| 180 | |
| 181 | /* Characters that are undesirable in an MS-DOS file name */ |
| 182 | |
| 183 | static inline wchar_t vfat_bad_char(wchar_t w) |
| 184 | { |
| 185 | return (w < 0x0020) |
| 186 | || (w == '*') || (w == '?') || (w == '<') || (w == '>') |
| 187 | || (w == '|') || (w == '"') || (w == ':') || (w == '/') |
| 188 | || (w == '\\'); |
| 189 | } |
| 190 | |
| 191 | static inline wchar_t vfat_replace_char(wchar_t w) |
| 192 | { |
| 193 | return (w == '[') || (w == ']') || (w == ';') || (w == ',') |
| 194 | || (w == '+') || (w == '='); |
| 195 | } |
| 196 | |
| 197 | static wchar_t vfat_skip_char(wchar_t w) |
| 198 | { |
| 199 | return (w == '.') || (w == ' '); |
| 200 | } |
| 201 | |
| 202 | static inline int vfat_is_used_badchars(const wchar_t *s, int len) |
| 203 | { |
| 204 | int i; |
| 205 | |
| 206 | for (i = 0; i < len; i++) |
| 207 | if (vfat_bad_char(s[i])) |
| 208 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 210 | if (s[i - 1] == ' ') /* last character cannot be space */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return -EINVAL; |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | static int vfat_find_form(struct inode *dir, unsigned char *name) |
| 217 | { |
| 218 | struct fat_slot_info sinfo; |
| 219 | int err = fat_scan(dir, name, &sinfo); |
| 220 | if (err) |
| 221 | return -ENOENT; |
| 222 | brelse(sinfo.bh); |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * 1) Valid characters for the 8.3 format alias are any combination of |
| 228 | * letters, uppercase alphabets, digits, any of the |
| 229 | * following special characters: |
| 230 | * $ % ' ` - @ { } ~ ! # ( ) & _ ^ |
| 231 | * In this case Longfilename is not stored in disk. |
| 232 | * |
| 233 | * WinNT's Extension: |
| 234 | * File name and extension name is contain uppercase/lowercase |
| 235 | * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT. |
| 236 | * |
| 237 | * 2) File name is 8.3 format, but it contain the uppercase and |
| 238 | * lowercase char, muliti bytes char, etc. In this case numtail is not |
| 239 | * added, but Longfilename is stored. |
| 240 | * |
| 241 | * 3) When the one except for the above, or the following special |
| 242 | * character are contained: |
| 243 | * . [ ] ; , + = |
| 244 | * numtail is added, and Longfilename must be stored in disk . |
| 245 | */ |
| 246 | struct shortname_info { |
| 247 | unsigned char lower:1, |
| 248 | upper:1, |
| 249 | valid:1; |
| 250 | }; |
| 251 | #define INIT_SHORTNAME_INFO(x) do { \ |
| 252 | (x)->lower = 1; \ |
| 253 | (x)->upper = 1; \ |
| 254 | (x)->valid = 1; \ |
| 255 | } while (0) |
| 256 | |
| 257 | static inline int to_shortname_char(struct nls_table *nls, |
| 258 | unsigned char *buf, int buf_size, |
| 259 | wchar_t *src, struct shortname_info *info) |
| 260 | { |
| 261 | int len; |
| 262 | |
| 263 | if (vfat_skip_char(*src)) { |
| 264 | info->valid = 0; |
| 265 | return 0; |
| 266 | } |
| 267 | if (vfat_replace_char(*src)) { |
| 268 | info->valid = 0; |
| 269 | buf[0] = '_'; |
| 270 | return 1; |
| 271 | } |
| 272 | |
| 273 | len = nls->uni2char(*src, buf, buf_size); |
| 274 | if (len <= 0) { |
| 275 | info->valid = 0; |
| 276 | buf[0] = '_'; |
| 277 | len = 1; |
| 278 | } else if (len == 1) { |
| 279 | unsigned char prev = buf[0]; |
| 280 | |
| 281 | if (buf[0] >= 0x7F) { |
| 282 | info->lower = 0; |
| 283 | info->upper = 0; |
| 284 | } |
| 285 | |
| 286 | buf[0] = nls_toupper(nls, buf[0]); |
| 287 | if (isalpha(buf[0])) { |
| 288 | if (buf[0] == prev) |
| 289 | info->lower = 0; |
| 290 | else |
| 291 | info->upper = 0; |
| 292 | } |
| 293 | } else { |
| 294 | info->lower = 0; |
| 295 | info->upper = 0; |
| 296 | } |
| 297 | |
| 298 | return len; |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Given a valid longname, create a unique shortname. Make sure the |
| 303 | * shortname does not exist |
| 304 | * Returns negative number on error, 0 for a normal |
| 305 | * return, and 1 for valid shortname |
| 306 | */ |
| 307 | static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, |
| 308 | wchar_t *uname, int ulen, |
| 309 | unsigned char *name_res, unsigned char *lcase) |
| 310 | { |
| 311 | struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options; |
| 312 | wchar_t *ip, *ext_start, *end, *name_start; |
| 313 | unsigned char base[9], ext[4], buf[8], *p; |
| 314 | unsigned char charbuf[NLS_MAX_CHARSET_SIZE]; |
| 315 | int chl, chi; |
| 316 | int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen; |
| 317 | int is_shortname; |
| 318 | struct shortname_info base_info, ext_info; |
| 319 | |
| 320 | is_shortname = 1; |
| 321 | INIT_SHORTNAME_INFO(&base_info); |
| 322 | INIT_SHORTNAME_INFO(&ext_info); |
| 323 | |
| 324 | /* Now, we need to create a shortname from the long name */ |
| 325 | ext_start = end = &uname[ulen]; |
| 326 | while (--ext_start >= uname) { |
| 327 | if (*ext_start == 0x002E) { /* is `.' */ |
| 328 | if (ext_start == end - 1) { |
| 329 | sz = ulen; |
| 330 | ext_start = NULL; |
| 331 | } |
| 332 | break; |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | if (ext_start == uname - 1) { |
| 337 | sz = ulen; |
| 338 | ext_start = NULL; |
| 339 | } else if (ext_start) { |
| 340 | /* |
| 341 | * Names which start with a dot could be just |
| 342 | * an extension eg. "...test". In this case Win95 |
| 343 | * uses the extension as the name and sets no extension. |
| 344 | */ |
| 345 | name_start = &uname[0]; |
| 346 | while (name_start < ext_start) { |
| 347 | if (!vfat_skip_char(*name_start)) |
| 348 | break; |
| 349 | name_start++; |
| 350 | } |
| 351 | if (name_start != ext_start) { |
| 352 | sz = ext_start - uname; |
| 353 | ext_start++; |
| 354 | } else { |
| 355 | sz = ulen; |
| 356 | ext_start = NULL; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | numtail_baselen = 6; |
| 361 | numtail2_baselen = 2; |
| 362 | for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) { |
| 363 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), |
| 364 | ip, &base_info); |
| 365 | if (chl == 0) |
| 366 | continue; |
| 367 | |
| 368 | if (baselen < 2 && (baselen + chl) > 2) |
| 369 | numtail2_baselen = baselen; |
| 370 | if (baselen < 6 && (baselen + chl) > 6) |
| 371 | numtail_baselen = baselen; |
| 372 | for (chi = 0; chi < chl; chi++) { |
| 373 | *p++ = charbuf[chi]; |
| 374 | baselen++; |
| 375 | if (baselen >= 8) |
| 376 | break; |
| 377 | } |
| 378 | if (baselen >= 8) { |
| 379 | if ((chi < chl - 1) || (ip + 1) - uname < sz) |
| 380 | is_shortname = 0; |
| 381 | break; |
| 382 | } |
| 383 | } |
| 384 | if (baselen == 0) { |
| 385 | return -EINVAL; |
| 386 | } |
| 387 | |
| 388 | extlen = 0; |
| 389 | if (ext_start) { |
| 390 | for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) { |
| 391 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), |
| 392 | ip, &ext_info); |
| 393 | if (chl == 0) |
| 394 | continue; |
| 395 | |
| 396 | if ((extlen + chl) > 3) { |
| 397 | is_shortname = 0; |
| 398 | break; |
| 399 | } |
| 400 | for (chi = 0; chi < chl; chi++) { |
| 401 | *p++ = charbuf[chi]; |
| 402 | extlen++; |
| 403 | } |
| 404 | if (extlen >= 3) { |
| 405 | if (ip + 1 != end) |
| 406 | is_shortname = 0; |
| 407 | break; |
| 408 | } |
| 409 | } |
| 410 | } |
| 411 | ext[extlen] = '\0'; |
| 412 | base[baselen] = '\0'; |
| 413 | |
| 414 | /* Yes, it can happen. ".\xe5" would do it. */ |
| 415 | if (base[0] == DELETED_FLAG) |
| 416 | base[0] = 0x05; |
| 417 | |
| 418 | /* OK, at this point we know that base is not longer than 8 symbols, |
| 419 | * ext is not longer than 3, base is nonempty, both don't contain |
| 420 | * any bad symbols (lowercase transformed to uppercase). |
| 421 | */ |
| 422 | |
| 423 | memset(name_res, ' ', MSDOS_NAME); |
| 424 | memcpy(name_res, base, baselen); |
| 425 | memcpy(name_res + 8, ext, extlen); |
| 426 | *lcase = 0; |
| 427 | if (is_shortname && base_info.valid && ext_info.valid) { |
| 428 | if (vfat_find_form(dir, name_res) == 0) |
| 429 | return -EEXIST; |
| 430 | |
| 431 | if (opts->shortname & VFAT_SFN_CREATE_WIN95) { |
| 432 | return (base_info.upper && ext_info.upper); |
| 433 | } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) { |
| 434 | if ((base_info.upper || base_info.lower) && |
| 435 | (ext_info.upper || ext_info.lower)) { |
| 436 | if (!base_info.upper && base_info.lower) |
| 437 | *lcase |= CASE_LOWER_BASE; |
| 438 | if (!ext_info.upper && ext_info.lower) |
| 439 | *lcase |= CASE_LOWER_EXT; |
| 440 | return 1; |
| 441 | } |
| 442 | return 0; |
| 443 | } else { |
| 444 | BUG(); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | if (opts->numtail == 0) |
| 449 | if (vfat_find_form(dir, name_res) < 0) |
| 450 | return 0; |
| 451 | |
| 452 | /* |
| 453 | * Try to find a unique extension. This used to |
| 454 | * iterate through all possibilities sequentially, |
| 455 | * but that gave extremely bad performance. Windows |
| 456 | * only tries a few cases before using random |
| 457 | * values for part of the base. |
| 458 | */ |
| 459 | |
| 460 | if (baselen > 6) { |
| 461 | baselen = numtail_baselen; |
| 462 | name_res[7] = ' '; |
| 463 | } |
| 464 | name_res[baselen] = '~'; |
| 465 | for (i = 1; i < 10; i++) { |
| 466 | name_res[baselen + 1] = i + '0'; |
| 467 | if (vfat_find_form(dir, name_res) < 0) |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | i = jiffies & 0xffff; |
| 472 | sz = (jiffies >> 16) & 0x7; |
| 473 | if (baselen > 2) { |
| 474 | baselen = numtail2_baselen; |
| 475 | name_res[7] = ' '; |
| 476 | } |
| 477 | name_res[baselen + 4] = '~'; |
| 478 | name_res[baselen + 5] = '1' + sz; |
| 479 | while (1) { |
| 480 | sprintf(buf, "%04X", i); |
| 481 | memcpy(&name_res[baselen], buf, 4); |
| 482 | if (vfat_find_form(dir, name_res) < 0) |
| 483 | break; |
| 484 | i -= 11; |
| 485 | } |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | /* Translate a string, including coded sequences into Unicode */ |
| 490 | static int |
| 491 | xlate_to_uni(const unsigned char *name, int len, unsigned char *outname, |
| 492 | int *longlen, int *outlen, int escape, int utf8, |
| 493 | struct nls_table *nls) |
| 494 | { |
| 495 | const unsigned char *ip; |
| 496 | unsigned char nc; |
| 497 | unsigned char *op; |
| 498 | unsigned int ec; |
| 499 | int i, k, fill; |
| 500 | int charlen; |
| 501 | |
| 502 | if (utf8) { |
| 503 | int name_len = strlen(name); |
| 504 | |
Alan Stern | 74675a5 | 2009-04-30 10:08:18 -0400 | [diff] [blame] | 505 | *outlen = utf8s_to_utf16s(name, PATH_MAX, (wchar_t *) outname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | /* |
| 508 | * We stripped '.'s before and set len appropriately, |
Alan Stern | 74675a5 | 2009-04-30 10:08:18 -0400 | [diff] [blame] | 509 | * but utf8s_to_utf16s doesn't care about len |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | */ |
| 511 | *outlen -= (name_len - len); |
| 512 | |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 513 | if (*outlen > 255) |
| 514 | return -ENAMETOOLONG; |
| 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | op = &outname[*outlen * sizeof(wchar_t)]; |
| 517 | } else { |
| 518 | if (nls) { |
| 519 | for (i = 0, ip = name, op = outname, *outlen = 0; |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 520 | i < len && *outlen <= 255; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | *outlen += 1) |
| 522 | { |
| 523 | if (escape && (*ip == ':')) { |
| 524 | if (i > len - 5) |
| 525 | return -EINVAL; |
| 526 | ec = 0; |
| 527 | for (k = 1; k < 5; k++) { |
| 528 | nc = ip[k]; |
| 529 | ec <<= 4; |
| 530 | if (nc >= '0' && nc <= '9') { |
| 531 | ec |= nc - '0'; |
| 532 | continue; |
| 533 | } |
| 534 | if (nc >= 'a' && nc <= 'f') { |
| 535 | ec |= nc - ('a' - 10); |
| 536 | continue; |
| 537 | } |
| 538 | if (nc >= 'A' && nc <= 'F') { |
| 539 | ec |= nc - ('A' - 10); |
| 540 | continue; |
| 541 | } |
| 542 | return -EINVAL; |
| 543 | } |
| 544 | *op++ = ec & 0xFF; |
| 545 | *op++ = ec >> 8; |
| 546 | ip += 5; |
| 547 | i += 5; |
| 548 | } else { |
| 549 | if ((charlen = nls->char2uni(ip, len - i, (wchar_t *)op)) < 0) |
| 550 | return -EINVAL; |
| 551 | ip += charlen; |
| 552 | i += charlen; |
| 553 | op += 2; |
| 554 | } |
| 555 | } |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 556 | if (i < len) |
| 557 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } else { |
| 559 | for (i = 0, ip = name, op = outname, *outlen = 0; |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 560 | i < len && *outlen <= 255; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | i++, *outlen += 1) |
| 562 | { |
| 563 | *op++ = *ip++; |
| 564 | *op++ = 0; |
| 565 | } |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 566 | if (i < len) |
| 567 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } |
| 569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
| 571 | *longlen = *outlen; |
| 572 | if (*outlen % 13) { |
| 573 | *op++ = 0; |
| 574 | *op++ = 0; |
| 575 | *outlen += 1; |
| 576 | if (*outlen % 13) { |
| 577 | fill = 13 - (*outlen % 13); |
| 578 | for (i = 0; i < fill; i++) { |
| 579 | *op++ = 0xff; |
| 580 | *op++ = 0xff; |
| 581 | } |
| 582 | *outlen += fill; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | static int vfat_build_slots(struct inode *dir, const unsigned char *name, |
| 590 | int len, int is_dir, int cluster, |
| 591 | struct timespec *ts, |
| 592 | struct msdos_dir_slot *slots, int *nr_slots) |
| 593 | { |
| 594 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
| 595 | struct fat_mount_options *opts = &sbi->options; |
| 596 | struct msdos_dir_slot *ps; |
| 597 | struct msdos_dir_entry *de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | unsigned char cksum, lcase; |
| 599 | unsigned char msdos_name[MSDOS_NAME]; |
| 600 | wchar_t *uname; |
| 601 | __le16 time, date; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 602 | u8 time_cs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | int err, ulen, usize, i; |
| 604 | loff_t offset; |
| 605 | |
| 606 | *nr_slots = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
OGAWA Hirofumi | c7a6c4e | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 608 | uname = __getname(); |
| 609 | if (!uname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | return -ENOMEM; |
| 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize, |
| 613 | opts->unicode_xlate, opts->utf8, sbi->nls_io); |
| 614 | if (err) |
| 615 | goto out_free; |
| 616 | |
| 617 | err = vfat_is_used_badchars(uname, ulen); |
| 618 | if (err) |
| 619 | goto out_free; |
| 620 | |
| 621 | err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen, |
| 622 | msdos_name, &lcase); |
| 623 | if (err < 0) |
| 624 | goto out_free; |
| 625 | else if (err == 1) { |
| 626 | de = (struct msdos_dir_entry *)slots; |
| 627 | err = 0; |
| 628 | goto shortname; |
| 629 | } |
| 630 | |
| 631 | /* build the entry of long file name */ |
OGAWA Hirofumi | 451cbaa | 2005-10-30 15:03:49 -0800 | [diff] [blame] | 632 | cksum = fat_checksum(msdos_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
| 634 | *nr_slots = usize / 13; |
| 635 | for (ps = slots, i = *nr_slots; i > 0; i--, ps++) { |
| 636 | ps->id = i; |
| 637 | ps->attr = ATTR_EXT; |
| 638 | ps->reserved = 0; |
| 639 | ps->alias_checksum = cksum; |
| 640 | ps->start = 0; |
| 641 | offset = (i - 1) * 13; |
| 642 | fatwchar_to16(ps->name0_4, uname + offset, 5); |
| 643 | fatwchar_to16(ps->name5_10, uname + offset + 5, 6); |
| 644 | fatwchar_to16(ps->name11_12, uname + offset + 11, 2); |
| 645 | } |
| 646 | slots[0].id |= 0x40; |
| 647 | de = (struct msdos_dir_entry *)ps; |
| 648 | |
| 649 | shortname: |
| 650 | /* build the entry of 8.3 alias name */ |
| 651 | (*nr_slots)++; |
| 652 | memcpy(de->name, msdos_name, MSDOS_NAME); |
| 653 | de->attr = is_dir ? ATTR_DIR : ATTR_ARCH; |
| 654 | de->lcase = lcase; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 655 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | de->time = de->ctime = time; |
| 657 | de->date = de->cdate = de->adate = date; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 658 | de->ctime_cs = time_cs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | de->start = cpu_to_le16(cluster); |
| 660 | de->starthi = cpu_to_le16(cluster >> 16); |
| 661 | de->size = 0; |
| 662 | out_free: |
OGAWA Hirofumi | c7a6c4e | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 663 | __putname(uname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | return err; |
| 665 | } |
| 666 | |
| 667 | static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir, |
| 668 | int cluster, struct timespec *ts, |
| 669 | struct fat_slot_info *sinfo) |
| 670 | { |
| 671 | struct msdos_dir_slot *slots; |
| 672 | unsigned int len; |
| 673 | int err, nr_slots; |
| 674 | |
| 675 | len = vfat_striptail_len(qname); |
| 676 | if (len == 0) |
| 677 | return -ENOENT; |
| 678 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 679 | slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | if (slots == NULL) |
| 681 | return -ENOMEM; |
| 682 | |
| 683 | err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts, |
| 684 | slots, &nr_slots); |
| 685 | if (err) |
| 686 | goto cleanup; |
| 687 | |
| 688 | err = fat_add_entries(dir, slots, nr_slots, sinfo); |
| 689 | if (err) |
| 690 | goto cleanup; |
| 691 | |
| 692 | /* update timestamp */ |
| 693 | dir->i_ctime = dir->i_mtime = dir->i_atime = *ts; |
| 694 | if (IS_DIRSYNC(dir)) |
| 695 | (void)fat_sync_inode(dir); |
| 696 | else |
| 697 | mark_inode_dirty(dir); |
| 698 | cleanup: |
| 699 | kfree(slots); |
| 700 | return err; |
| 701 | } |
| 702 | |
| 703 | static int vfat_find(struct inode *dir, struct qstr *qname, |
| 704 | struct fat_slot_info *sinfo) |
| 705 | { |
| 706 | unsigned int len = vfat_striptail_len(qname); |
| 707 | if (len == 0) |
| 708 | return -ENOENT; |
| 709 | return fat_search_long(dir, qname->name, len, sinfo); |
| 710 | } |
| 711 | |
| 712 | static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, |
| 713 | struct nameidata *nd) |
| 714 | { |
| 715 | struct super_block *sb = dir->i_sb; |
| 716 | struct fat_slot_info sinfo; |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 717 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | struct dentry *alias; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 719 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 721 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
| 723 | err = vfat_find(dir, &dentry->d_name, &sinfo); |
| 724 | if (err) { |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 725 | if (err == -ENOENT) { |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 726 | inode = NULL; |
| 727 | goto out; |
| 728 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | goto error; |
| 730 | } |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 733 | brelse(sinfo.bh); |
| 734 | if (IS_ERR(inode)) { |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 735 | err = PTR_ERR(inode); |
| 736 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | alias = d_find_alias(inode); |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 740 | if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { |
| 741 | /* |
| 742 | * This inode has non DCACHE_DISCONNECTED dentry. This |
| 743 | * means, the user did ->lookup() by an another name |
| 744 | * (longname vs 8.3 alias of it) in past. |
| 745 | * |
| 746 | * Switch to new one for reason of locality if possible. |
| 747 | */ |
OGAWA Hirofumi | 1c13a24 | 2008-11-06 12:53:52 -0800 | [diff] [blame] | 748 | BUG_ON(d_unhashed(alias)); |
| 749 | if (!S_ISDIR(inode->i_mode)) |
| 750 | d_move(alias, dentry); |
| 751 | iput(inode); |
| 752 | unlock_super(sb); |
| 753 | return alias; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 755 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 756 | unlock_super(sb); |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 757 | dentry->d_op = sb->s_root->d_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | dentry->d_time = dentry->d_parent->d_inode->i_version; |
| 759 | dentry = d_splice_alias(inode, dentry); |
| 760 | if (dentry) { |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 761 | dentry->d_op = sb->s_root->d_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | dentry->d_time = dentry->d_parent->d_inode->i_version; |
| 763 | } |
| 764 | return dentry; |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 765 | |
| 766 | error: |
| 767 | unlock_super(sb); |
| 768 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | static int vfat_create(struct inode *dir, struct dentry *dentry, int mode, |
| 772 | struct nameidata *nd) |
| 773 | { |
| 774 | struct super_block *sb = dir->i_sb; |
| 775 | struct inode *inode; |
| 776 | struct fat_slot_info sinfo; |
| 777 | struct timespec ts; |
| 778 | int err; |
| 779 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 780 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | ts = CURRENT_TIME_SEC; |
| 783 | err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo); |
| 784 | if (err) |
| 785 | goto out; |
| 786 | dir->i_version++; |
| 787 | |
| 788 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 789 | brelse(sinfo.bh); |
| 790 | if (IS_ERR(inode)) { |
| 791 | err = PTR_ERR(inode); |
| 792 | goto out; |
| 793 | } |
| 794 | inode->i_version++; |
| 795 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
| 796 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
| 797 | |
| 798 | dentry->d_time = dentry->d_parent->d_inode->i_version; |
| 799 | d_instantiate(dentry, inode); |
| 800 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 801 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | return err; |
| 803 | } |
| 804 | |
| 805 | static int vfat_rmdir(struct inode *dir, struct dentry *dentry) |
| 806 | { |
| 807 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 808 | struct super_block *sb = dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | struct fat_slot_info sinfo; |
| 810 | int err; |
| 811 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 812 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | err = fat_dir_empty(inode); |
| 815 | if (err) |
| 816 | goto out; |
| 817 | err = vfat_find(dir, &dentry->d_name, &sinfo); |
| 818 | if (err) |
| 819 | goto out; |
| 820 | |
| 821 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
| 822 | if (err) |
| 823 | goto out; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 824 | drop_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 826 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
| 828 | fat_detach(inode); |
| 829 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 830 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
| 832 | return err; |
| 833 | } |
| 834 | |
| 835 | static int vfat_unlink(struct inode *dir, struct dentry *dentry) |
| 836 | { |
| 837 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 838 | struct super_block *sb = dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | struct fat_slot_info sinfo; |
| 840 | int err; |
| 841 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 842 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
| 844 | err = vfat_find(dir, &dentry->d_name, &sinfo); |
| 845 | if (err) |
| 846 | goto out; |
| 847 | |
| 848 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
| 849 | if (err) |
| 850 | goto out; |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 851 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
| 853 | fat_detach(inode); |
| 854 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 855 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
| 857 | return err; |
| 858 | } |
| 859 | |
| 860 | static int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 861 | { |
| 862 | struct super_block *sb = dir->i_sb; |
| 863 | struct inode *inode; |
| 864 | struct fat_slot_info sinfo; |
| 865 | struct timespec ts; |
| 866 | int err, cluster; |
| 867 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 868 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | ts = CURRENT_TIME_SEC; |
| 871 | cluster = fat_alloc_new_dir(dir, &ts); |
| 872 | if (cluster < 0) { |
| 873 | err = cluster; |
| 874 | goto out; |
| 875 | } |
| 876 | err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo); |
| 877 | if (err) |
| 878 | goto out_free; |
| 879 | dir->i_version++; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 880 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
| 882 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 883 | brelse(sinfo.bh); |
| 884 | if (IS_ERR(inode)) { |
| 885 | err = PTR_ERR(inode); |
| 886 | /* the directory was completed, just return a error */ |
| 887 | goto out; |
| 888 | } |
| 889 | inode->i_version++; |
| 890 | inode->i_nlink = 2; |
| 891 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
| 892 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
| 893 | |
| 894 | dentry->d_time = dentry->d_parent->d_inode->i_version; |
| 895 | d_instantiate(dentry, inode); |
| 896 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 897 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | return 0; |
| 899 | |
| 900 | out_free: |
| 901 | fat_free_clusters(dir, cluster); |
| 902 | out: |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 903 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | return err; |
| 905 | } |
| 906 | |
| 907 | static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 908 | struct inode *new_dir, struct dentry *new_dentry) |
| 909 | { |
| 910 | struct buffer_head *dotdot_bh; |
| 911 | struct msdos_dir_entry *dotdot_de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | struct inode *old_inode, *new_inode; |
| 913 | struct fat_slot_info old_sinfo, sinfo; |
| 914 | struct timespec ts; |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 915 | loff_t dotdot_i_pos, new_i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | int err, is_dir, update_dotdot, corrupt = 0; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 917 | struct super_block *sb = old_dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; |
| 920 | old_inode = old_dentry->d_inode; |
| 921 | new_inode = new_dentry->d_inode; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 922 | lock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo); |
| 924 | if (err) |
| 925 | goto out; |
| 926 | |
| 927 | is_dir = S_ISDIR(old_inode->i_mode); |
| 928 | update_dotdot = (is_dir && old_dir != new_dir); |
| 929 | if (update_dotdot) { |
| 930 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de, |
| 931 | &dotdot_i_pos) < 0) { |
| 932 | err = -EIO; |
| 933 | goto out; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | ts = CURRENT_TIME_SEC; |
| 938 | if (new_inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | if (is_dir) { |
| 940 | err = fat_dir_empty(new_inode); |
| 941 | if (err) |
| 942 | goto out; |
| 943 | } |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 944 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | fat_detach(new_inode); |
| 946 | } else { |
| 947 | err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0, |
| 948 | &ts, &sinfo); |
| 949 | if (err) |
| 950 | goto out; |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 951 | new_i_pos = sinfo.i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | } |
| 953 | new_dir->i_version++; |
| 954 | |
| 955 | fat_detach(old_inode); |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 956 | fat_attach(old_inode, new_i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | if (IS_DIRSYNC(new_dir)) { |
| 958 | err = fat_sync_inode(old_inode); |
| 959 | if (err) |
| 960 | goto error_inode; |
| 961 | } else |
| 962 | mark_inode_dirty(old_inode); |
| 963 | |
| 964 | if (update_dotdot) { |
| 965 | int start = MSDOS_I(new_dir)->i_logstart; |
| 966 | dotdot_de->start = cpu_to_le16(start); |
| 967 | dotdot_de->starthi = cpu_to_le16(start >> 16); |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 968 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | if (IS_DIRSYNC(new_dir)) { |
| 970 | err = sync_dirty_buffer(dotdot_bh); |
| 971 | if (err) |
| 972 | goto error_dotdot; |
| 973 | } |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 974 | drop_nlink(old_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | if (!new_inode) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 976 | inc_nlink(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | } |
| 978 | |
| 979 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ |
| 980 | old_sinfo.bh = NULL; |
| 981 | if (err) |
| 982 | goto error_dotdot; |
| 983 | old_dir->i_version++; |
| 984 | old_dir->i_ctime = old_dir->i_mtime = ts; |
| 985 | if (IS_DIRSYNC(old_dir)) |
| 986 | (void)fat_sync_inode(old_dir); |
| 987 | else |
| 988 | mark_inode_dirty(old_dir); |
| 989 | |
| 990 | if (new_inode) { |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 991 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | if (is_dir) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 993 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | new_inode->i_ctime = ts; |
| 995 | } |
| 996 | out: |
| 997 | brelse(sinfo.bh); |
| 998 | brelse(dotdot_bh); |
| 999 | brelse(old_sinfo.bh); |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 1000 | unlock_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
| 1002 | return err; |
| 1003 | |
| 1004 | error_dotdot: |
| 1005 | /* data cluster is shared, serious corruption */ |
| 1006 | corrupt = 1; |
| 1007 | |
| 1008 | if (update_dotdot) { |
| 1009 | int start = MSDOS_I(old_dir)->i_logstart; |
| 1010 | dotdot_de->start = cpu_to_le16(start); |
| 1011 | dotdot_de->starthi = cpu_to_le16(start >> 16); |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1012 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | corrupt |= sync_dirty_buffer(dotdot_bh); |
| 1014 | } |
| 1015 | error_inode: |
| 1016 | fat_detach(old_inode); |
| 1017 | fat_attach(old_inode, old_sinfo.i_pos); |
| 1018 | if (new_inode) { |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 1019 | fat_attach(new_inode, new_i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | if (corrupt) |
| 1021 | corrupt |= fat_sync_inode(new_inode); |
| 1022 | } else { |
| 1023 | /* |
| 1024 | * If new entry was not sharing the data cluster, it |
| 1025 | * shouldn't be serious corruption. |
| 1026 | */ |
| 1027 | int err2 = fat_remove_entries(new_dir, &sinfo); |
| 1028 | if (corrupt) |
| 1029 | corrupt |= err2; |
| 1030 | sinfo.bh = NULL; |
| 1031 | } |
| 1032 | if (corrupt < 0) { |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 1033 | fat_fs_error(new_dir->i_sb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | "%s: Filesystem corrupted (i_pos %lld)", |
Harvey Harrison | 8e24eea | 2008-04-30 00:55:09 -0700 | [diff] [blame] | 1035 | __func__, sinfo.i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | } |
| 1037 | goto out; |
| 1038 | } |
| 1039 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1040 | static const struct inode_operations vfat_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | .create = vfat_create, |
| 1042 | .lookup = vfat_lookup, |
| 1043 | .unlink = vfat_unlink, |
| 1044 | .mkdir = vfat_mkdir, |
| 1045 | .rmdir = vfat_rmdir, |
| 1046 | .rename = vfat_rename, |
OGAWA Hirofumi | 1278fdd | 2008-04-28 02:16:25 -0700 | [diff] [blame] | 1047 | .setattr = fat_setattr, |
OGAWA Hirofumi | da63fc7 | 2006-11-16 01:19:28 -0800 | [diff] [blame] | 1048 | .getattr = fat_getattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | }; |
| 1050 | |
| 1051 | static int vfat_fill_super(struct super_block *sb, void *data, int silent) |
| 1052 | { |
| 1053 | int res; |
| 1054 | |
| 1055 | res = fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, 1); |
| 1056 | if (res) |
| 1057 | return res; |
| 1058 | |
| 1059 | if (MSDOS_SB(sb)->options.name_check != 's') |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 1060 | sb->s_root->d_op = &vfat_ci_dentry_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | else |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 1062 | sb->s_root->d_op = &vfat_dentry_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1067 | static int vfat_get_sb(struct file_system_type *fs_type, |
| 1068 | int flags, const char *dev_name, |
| 1069 | void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1071 | return get_sb_bdev(fs_type, flags, dev_name, data, vfat_fill_super, |
| 1072 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
| 1075 | static struct file_system_type vfat_fs_type = { |
| 1076 | .owner = THIS_MODULE, |
| 1077 | .name = "vfat", |
| 1078 | .get_sb = vfat_get_sb, |
| 1079 | .kill_sb = kill_block_super, |
| 1080 | .fs_flags = FS_REQUIRES_DEV, |
| 1081 | }; |
| 1082 | |
| 1083 | static int __init init_vfat_fs(void) |
| 1084 | { |
| 1085 | return register_filesystem(&vfat_fs_type); |
| 1086 | } |
| 1087 | |
| 1088 | static void __exit exit_vfat_fs(void) |
| 1089 | { |
| 1090 | unregister_filesystem(&vfat_fs_type); |
| 1091 | } |
| 1092 | |
| 1093 | MODULE_LICENSE("GPL"); |
| 1094 | MODULE_DESCRIPTION("VFAT filesystem support"); |
| 1095 | MODULE_AUTHOR("Gordon Chaffee"); |
| 1096 | |
| 1097 | module_init(init_vfat_fs) |
| 1098 | module_exit(exit_vfat_fs) |