blob: a81eb2367d39a4f65b5e75b93c179ca1780601ae [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/ctype.h>
21#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/buffer_head.h>
23#include <linux/namei.h>
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -080024#include "fat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080026/*
27 * If new entry was created in the parent, it could create the 8.3
28 * alias (the shortname of logname). So, the parent may have the
29 * negative-dentry which matches the created 8.3 alias.
30 *
31 * If it happened, the negative dentry isn't actually negative
32 * anymore. So, drop it.
33 */
34static int vfat_revalidate_shortname(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
36 int ret = 1;
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080037 spin_lock(&dentry->d_lock);
38 if (dentry->d_time != dentry->d_parent->d_inode->i_version)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 ret = 0;
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080040 spin_unlock(&dentry->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 return ret;
42}
43
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080044static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
45{
Al Viro9177ada2011-03-10 03:45:49 -050046 if (nd && nd->flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +110047 return -ECHILD;
48
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080049 /* This is not negative dentry. Always valid. */
50 if (dentry->d_inode)
51 return 1;
52 return vfat_revalidate_shortname(dentry);
53}
54
55static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
56{
Al Viro9177ada2011-03-10 03:45:49 -050057 if (nd && nd->flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +110058 return -ECHILD;
59
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080060 /*
61 * This is not negative dentry. Always valid.
62 *
63 * Note, rename() to existing directory entry will have ->d_inode,
64 * and will use existing name which isn't specified name by user.
65 *
66 * We may be able to drop this positive dentry here. But dropping
67 * positive dentry isn't good idea. So it's unsupported like
68 * rename("filename", "FILENAME") for now.
69 */
70 if (dentry->d_inode)
71 return 1;
72
73 /*
74 * This may be nfsd (or something), anyway, we can't see the
75 * intent of this. So, since this can be for creation, drop it.
76 */
77 if (!nd)
78 return 0;
79
80 /*
81 * Drop the negative dentry, in order to make sure to use the
82 * case sensitive name which is specified by user if this is
83 * for creation.
84 */
Al Viro407938e2011-06-25 21:37:18 -040085 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
86 return 0;
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080087
88 return vfat_revalidate_shortname(dentry);
89}
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/* returns the length of a struct qstr, ignoring trailing dots */
Nick Piggin621e1552011-01-07 17:49:27 +110092static unsigned int __vfat_striptail_len(unsigned int len, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Nick Piggin621e1552011-01-07 17:49:27 +110094 while (len && name[len - 1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 len--;
96 return len;
97}
98
Nick Piggin621e1552011-01-07 17:49:27 +110099static unsigned int vfat_striptail_len(const struct qstr *qstr)
100{
101 return __vfat_striptail_len(qstr->len, qstr->name);
102}
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/*
105 * Compute the hash for the vfat name corresponding to the dentry.
106 * Note: if the name is invalid, we leave the hash code unchanged so
107 * that the existing dentry can be used. The vfat fs routines will
108 * return ENOENT or EINVAL as appropriate.
109 */
Nick Pigginb1e6a012011-01-07 17:49:28 +1100110static int vfat_hash(const struct dentry *dentry, const struct inode *inode,
111 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
113 qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
114 return 0;
115}
116
117/*
118 * Compute the hash for the vfat name corresponding to the dentry.
119 * Note: if the name is invalid, we leave the hash code unchanged so
120 * that the existing dentry can be used. The vfat fs routines will
121 * return ENOENT or EINVAL as appropriate.
122 */
Nick Pigginb1e6a012011-01-07 17:49:28 +1100123static int vfat_hashi(const struct dentry *dentry, const struct inode *inode,
124 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Nick Pigginb1e6a012011-01-07 17:49:28 +1100126 struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 const unsigned char *name;
128 unsigned int len;
129 unsigned long hash;
130
131 name = qstr->name;
132 len = vfat_striptail_len(qstr);
133
134 hash = init_name_hash();
135 while (len--)
136 hash = partial_name_hash(nls_tolower(t, *name++), hash);
137 qstr->hash = end_name_hash(hash);
138
139 return 0;
140}
141
142/*
143 * Case insensitive compare of two vfat names.
144 */
Nick Piggin621e1552011-01-07 17:49:27 +1100145static int vfat_cmpi(const struct dentry *parent, const struct inode *pinode,
146 const struct dentry *dentry, const struct inode *inode,
147 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Nick Piggin621e1552011-01-07 17:49:27 +1100149 struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 unsigned int alen, blen;
151
152 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100153 alen = vfat_striptail_len(name);
154 blen = __vfat_striptail_len(len, str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100156 if (nls_strnicmp(t, name->name, str, alen) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 return 0;
158 }
159 return 1;
160}
161
162/*
163 * Case sensitive compare of two vfat names.
164 */
Nick Piggin621e1552011-01-07 17:49:27 +1100165static int vfat_cmp(const struct dentry *parent, const struct inode *pinode,
166 const struct dentry *dentry, const struct inode *inode,
167 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
169 unsigned int alen, blen;
170
171 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100172 alen = vfat_striptail_len(name);
173 blen = __vfat_striptail_len(len, str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100175 if (strncmp(name->name, str, alen) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 return 0;
177 }
178 return 1;
179}
180
Al Viroce6cdc42009-02-20 05:59:46 +0000181static const struct dentry_operations vfat_ci_dentry_ops = {
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800182 .d_revalidate = vfat_revalidate_ci,
183 .d_hash = vfat_hashi,
184 .d_compare = vfat_cmpi,
185};
186
Al Viroce6cdc42009-02-20 05:59:46 +0000187static const struct dentry_operations vfat_dentry_ops = {
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800188 .d_revalidate = vfat_revalidate,
189 .d_hash = vfat_hash,
190 .d_compare = vfat_cmp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191};
192
193/* Characters that are undesirable in an MS-DOS file name */
194
195static inline wchar_t vfat_bad_char(wchar_t w)
196{
197 return (w < 0x0020)
198 || (w == '*') || (w == '?') || (w == '<') || (w == '>')
199 || (w == '|') || (w == '"') || (w == ':') || (w == '/')
200 || (w == '\\');
201}
202
203static inline wchar_t vfat_replace_char(wchar_t w)
204{
205 return (w == '[') || (w == ']') || (w == ';') || (w == ',')
206 || (w == '+') || (w == '=');
207}
208
209static wchar_t vfat_skip_char(wchar_t w)
210{
211 return (w == '.') || (w == ' ');
212}
213
214static inline int vfat_is_used_badchars(const wchar_t *s, int len)
215{
216 int i;
217
218 for (i = 0; i < len; i++)
219 if (vfat_bad_char(s[i]))
220 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Keith Mokf22032b2008-04-28 02:16:29 -0700222 if (s[i - 1] == ' ') /* last character cannot be space */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 return -EINVAL;
Keith Mokf22032b2008-04-28 02:16:29 -0700224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return 0;
226}
227
228static int vfat_find_form(struct inode *dir, unsigned char *name)
229{
230 struct fat_slot_info sinfo;
231 int err = fat_scan(dir, name, &sinfo);
232 if (err)
233 return -ENOENT;
234 brelse(sinfo.bh);
235 return 0;
236}
237
238/*
239 * 1) Valid characters for the 8.3 format alias are any combination of
240 * letters, uppercase alphabets, digits, any of the
241 * following special characters:
242 * $ % ' ` - @ { } ~ ! # ( ) & _ ^
243 * In this case Longfilename is not stored in disk.
244 *
245 * WinNT's Extension:
246 * File name and extension name is contain uppercase/lowercase
247 * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT.
248 *
249 * 2) File name is 8.3 format, but it contain the uppercase and
250 * lowercase char, muliti bytes char, etc. In this case numtail is not
251 * added, but Longfilename is stored.
252 *
253 * 3) When the one except for the above, or the following special
254 * character are contained:
255 * . [ ] ; , + =
256 * numtail is added, and Longfilename must be stored in disk .
257 */
258struct shortname_info {
259 unsigned char lower:1,
260 upper:1,
261 valid:1;
262};
263#define INIT_SHORTNAME_INFO(x) do { \
264 (x)->lower = 1; \
265 (x)->upper = 1; \
266 (x)->valid = 1; \
267} while (0)
268
269static inline int to_shortname_char(struct nls_table *nls,
270 unsigned char *buf, int buf_size,
271 wchar_t *src, struct shortname_info *info)
272{
273 int len;
274
275 if (vfat_skip_char(*src)) {
276 info->valid = 0;
277 return 0;
278 }
279 if (vfat_replace_char(*src)) {
280 info->valid = 0;
281 buf[0] = '_';
282 return 1;
283 }
284
285 len = nls->uni2char(*src, buf, buf_size);
286 if (len <= 0) {
287 info->valid = 0;
288 buf[0] = '_';
289 len = 1;
290 } else if (len == 1) {
291 unsigned char prev = buf[0];
292
293 if (buf[0] >= 0x7F) {
294 info->lower = 0;
295 info->upper = 0;
296 }
297
298 buf[0] = nls_toupper(nls, buf[0]);
299 if (isalpha(buf[0])) {
300 if (buf[0] == prev)
301 info->lower = 0;
302 else
303 info->upper = 0;
304 }
305 } else {
306 info->lower = 0;
307 info->upper = 0;
308 }
309
310 return len;
311}
312
313/*
314 * Given a valid longname, create a unique shortname. Make sure the
315 * shortname does not exist
316 * Returns negative number on error, 0 for a normal
317 * return, and 1 for valid shortname
318 */
319static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
320 wchar_t *uname, int ulen,
321 unsigned char *name_res, unsigned char *lcase)
322{
323 struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
324 wchar_t *ip, *ext_start, *end, *name_start;
Nikolaus Schulz30d18722010-04-01 02:21:10 +0900325 unsigned char base[9], ext[4], buf[5], *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 unsigned char charbuf[NLS_MAX_CHARSET_SIZE];
327 int chl, chi;
328 int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen;
329 int is_shortname;
330 struct shortname_info base_info, ext_info;
331
332 is_shortname = 1;
333 INIT_SHORTNAME_INFO(&base_info);
334 INIT_SHORTNAME_INFO(&ext_info);
335
336 /* Now, we need to create a shortname from the long name */
337 ext_start = end = &uname[ulen];
338 while (--ext_start >= uname) {
339 if (*ext_start == 0x002E) { /* is `.' */
340 if (ext_start == end - 1) {
341 sz = ulen;
342 ext_start = NULL;
343 }
344 break;
345 }
346 }
347
348 if (ext_start == uname - 1) {
349 sz = ulen;
350 ext_start = NULL;
351 } else if (ext_start) {
352 /*
353 * Names which start with a dot could be just
354 * an extension eg. "...test". In this case Win95
355 * uses the extension as the name and sets no extension.
356 */
357 name_start = &uname[0];
358 while (name_start < ext_start) {
359 if (!vfat_skip_char(*name_start))
360 break;
361 name_start++;
362 }
363 if (name_start != ext_start) {
364 sz = ext_start - uname;
365 ext_start++;
366 } else {
367 sz = ulen;
368 ext_start = NULL;
369 }
370 }
371
372 numtail_baselen = 6;
373 numtail2_baselen = 2;
374 for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) {
375 chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
376 ip, &base_info);
377 if (chl == 0)
378 continue;
379
380 if (baselen < 2 && (baselen + chl) > 2)
381 numtail2_baselen = baselen;
382 if (baselen < 6 && (baselen + chl) > 6)
383 numtail_baselen = baselen;
384 for (chi = 0; chi < chl; chi++) {
385 *p++ = charbuf[chi];
386 baselen++;
387 if (baselen >= 8)
388 break;
389 }
390 if (baselen >= 8) {
391 if ((chi < chl - 1) || (ip + 1) - uname < sz)
392 is_shortname = 0;
393 break;
394 }
395 }
396 if (baselen == 0) {
397 return -EINVAL;
398 }
399
400 extlen = 0;
401 if (ext_start) {
402 for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
403 chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
404 ip, &ext_info);
405 if (chl == 0)
406 continue;
407
408 if ((extlen + chl) > 3) {
409 is_shortname = 0;
410 break;
411 }
412 for (chi = 0; chi < chl; chi++) {
413 *p++ = charbuf[chi];
414 extlen++;
415 }
416 if (extlen >= 3) {
417 if (ip + 1 != end)
418 is_shortname = 0;
419 break;
420 }
421 }
422 }
423 ext[extlen] = '\0';
424 base[baselen] = '\0';
425
426 /* Yes, it can happen. ".\xe5" would do it. */
427 if (base[0] == DELETED_FLAG)
428 base[0] = 0x05;
429
430 /* OK, at this point we know that base is not longer than 8 symbols,
431 * ext is not longer than 3, base is nonempty, both don't contain
432 * any bad symbols (lowercase transformed to uppercase).
433 */
434
435 memset(name_res, ' ', MSDOS_NAME);
436 memcpy(name_res, base, baselen);
437 memcpy(name_res + 8, ext, extlen);
438 *lcase = 0;
439 if (is_shortname && base_info.valid && ext_info.valid) {
440 if (vfat_find_form(dir, name_res) == 0)
441 return -EEXIST;
442
443 if (opts->shortname & VFAT_SFN_CREATE_WIN95) {
444 return (base_info.upper && ext_info.upper);
445 } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) {
446 if ((base_info.upper || base_info.lower) &&
447 (ext_info.upper || ext_info.lower)) {
448 if (!base_info.upper && base_info.lower)
449 *lcase |= CASE_LOWER_BASE;
450 if (!ext_info.upper && ext_info.lower)
451 *lcase |= CASE_LOWER_EXT;
452 return 1;
453 }
454 return 0;
455 } else {
456 BUG();
457 }
458 }
459
460 if (opts->numtail == 0)
461 if (vfat_find_form(dir, name_res) < 0)
462 return 0;
463
464 /*
465 * Try to find a unique extension. This used to
466 * iterate through all possibilities sequentially,
467 * but that gave extremely bad performance. Windows
468 * only tries a few cases before using random
469 * values for part of the base.
470 */
471
472 if (baselen > 6) {
473 baselen = numtail_baselen;
474 name_res[7] = ' ';
475 }
476 name_res[baselen] = '~';
477 for (i = 1; i < 10; i++) {
478 name_res[baselen + 1] = i + '0';
479 if (vfat_find_form(dir, name_res) < 0)
480 return 0;
481 }
482
Nikolaus Schulz30d18722010-04-01 02:21:10 +0900483 i = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 sz = (jiffies >> 16) & 0x7;
485 if (baselen > 2) {
486 baselen = numtail2_baselen;
487 name_res[7] = ' ';
488 }
489 name_res[baselen + 4] = '~';
490 name_res[baselen + 5] = '1' + sz;
491 while (1) {
Nikolaus Schulz30d18722010-04-01 02:21:10 +0900492 snprintf(buf, sizeof(buf), "%04X", i & 0xffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 memcpy(&name_res[baselen], buf, 4);
494 if (vfat_find_form(dir, name_res) < 0)
495 break;
496 i -= 11;
497 }
498 return 0;
499}
500
501/* Translate a string, including coded sequences into Unicode */
502static int
503xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
504 int *longlen, int *outlen, int escape, int utf8,
505 struct nls_table *nls)
506{
507 const unsigned char *ip;
508 unsigned char nc;
509 unsigned char *op;
510 unsigned int ec;
511 int i, k, fill;
512 int charlen;
513
514 if (utf8) {
Alan Stern0720a062011-11-17 16:42:19 -0500515 *outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN,
516 (wchar_t *) outname, FAT_LFN_LEN + 2);
OGAWA Hirofumi67638e42009-08-01 21:30:31 +0900517 if (*outlen < 0)
518 return *outlen;
Kevin Dankwardteeb5b4a2010-02-10 23:43:40 +0900519 else if (*outlen > FAT_LFN_LEN)
Keith Mokf22032b2008-04-28 02:16:29 -0700520 return -ENAMETOOLONG;
521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 op = &outname[*outlen * sizeof(wchar_t)];
523 } else {
524 if (nls) {
525 for (i = 0, ip = name, op = outname, *outlen = 0;
Kevin Dankwardteeb5b4a2010-02-10 23:43:40 +0900526 i < len && *outlen <= FAT_LFN_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 *outlen += 1)
528 {
529 if (escape && (*ip == ':')) {
530 if (i > len - 5)
531 return -EINVAL;
532 ec = 0;
533 for (k = 1; k < 5; k++) {
534 nc = ip[k];
535 ec <<= 4;
536 if (nc >= '0' && nc <= '9') {
537 ec |= nc - '0';
538 continue;
539 }
540 if (nc >= 'a' && nc <= 'f') {
541 ec |= nc - ('a' - 10);
542 continue;
543 }
544 if (nc >= 'A' && nc <= 'F') {
545 ec |= nc - ('A' - 10);
546 continue;
547 }
548 return -EINVAL;
549 }
550 *op++ = ec & 0xFF;
551 *op++ = ec >> 8;
552 ip += 5;
553 i += 5;
554 } else {
555 if ((charlen = nls->char2uni(ip, len - i, (wchar_t *)op)) < 0)
556 return -EINVAL;
557 ip += charlen;
558 i += charlen;
559 op += 2;
560 }
561 }
Keith Mokf22032b2008-04-28 02:16:29 -0700562 if (i < len)
563 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 } else {
565 for (i = 0, ip = name, op = outname, *outlen = 0;
Kevin Dankwardteeb5b4a2010-02-10 23:43:40 +0900566 i < len && *outlen <= FAT_LFN_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 i++, *outlen += 1)
568 {
569 *op++ = *ip++;
570 *op++ = 0;
571 }
Keith Mokf22032b2008-04-28 02:16:29 -0700572 if (i < len)
573 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
575 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
577 *longlen = *outlen;
578 if (*outlen % 13) {
579 *op++ = 0;
580 *op++ = 0;
581 *outlen += 1;
582 if (*outlen % 13) {
583 fill = 13 - (*outlen % 13);
584 for (i = 0; i < fill; i++) {
585 *op++ = 0xff;
586 *op++ = 0xff;
587 }
588 *outlen += fill;
589 }
590 }
591
592 return 0;
593}
594
595static int vfat_build_slots(struct inode *dir, const unsigned char *name,
596 int len, int is_dir, int cluster,
597 struct timespec *ts,
598 struct msdos_dir_slot *slots, int *nr_slots)
599{
600 struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
601 struct fat_mount_options *opts = &sbi->options;
602 struct msdos_dir_slot *ps;
603 struct msdos_dir_entry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 unsigned char cksum, lcase;
605 unsigned char msdos_name[MSDOS_NAME];
606 wchar_t *uname;
607 __le16 time, date;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800608 u8 time_cs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 int err, ulen, usize, i;
610 loff_t offset;
611
612 *nr_slots = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
OGAWA Hirofumic7a6c4e2008-04-28 02:16:29 -0700614 uname = __getname();
615 if (!uname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 return -ENOMEM;
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
619 opts->unicode_xlate, opts->utf8, sbi->nls_io);
620 if (err)
621 goto out_free;
622
623 err = vfat_is_used_badchars(uname, ulen);
624 if (err)
625 goto out_free;
626
627 err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
628 msdos_name, &lcase);
629 if (err < 0)
630 goto out_free;
631 else if (err == 1) {
632 de = (struct msdos_dir_entry *)slots;
633 err = 0;
634 goto shortname;
635 }
636
637 /* build the entry of long file name */
OGAWA Hirofumi451cbaa2005-10-30 15:03:49 -0800638 cksum = fat_checksum(msdos_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 *nr_slots = usize / 13;
641 for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
642 ps->id = i;
643 ps->attr = ATTR_EXT;
644 ps->reserved = 0;
645 ps->alias_checksum = cksum;
646 ps->start = 0;
647 offset = (i - 1) * 13;
648 fatwchar_to16(ps->name0_4, uname + offset, 5);
649 fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
650 fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
651 }
652 slots[0].id |= 0x40;
653 de = (struct msdos_dir_entry *)ps;
654
655shortname:
656 /* build the entry of 8.3 alias name */
657 (*nr_slots)++;
658 memcpy(de->name, msdos_name, MSDOS_NAME);
659 de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
660 de->lcase = lcase;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800661 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 de->time = de->ctime = time;
663 de->date = de->cdate = de->adate = date;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800664 de->ctime_cs = time_cs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 de->start = cpu_to_le16(cluster);
666 de->starthi = cpu_to_le16(cluster >> 16);
667 de->size = 0;
668out_free:
OGAWA Hirofumic7a6c4e2008-04-28 02:16:29 -0700669 __putname(uname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 return err;
671}
672
673static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
674 int cluster, struct timespec *ts,
675 struct fat_slot_info *sinfo)
676{
677 struct msdos_dir_slot *slots;
678 unsigned int len;
679 int err, nr_slots;
680
681 len = vfat_striptail_len(qname);
682 if (len == 0)
683 return -ENOENT;
684
Linus Torvalds8f593422008-05-19 19:53:01 -0700685 slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if (slots == NULL)
687 return -ENOMEM;
688
689 err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts,
690 slots, &nr_slots);
691 if (err)
692 goto cleanup;
693
694 err = fat_add_entries(dir, slots, nr_slots, sinfo);
695 if (err)
696 goto cleanup;
697
698 /* update timestamp */
699 dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
700 if (IS_DIRSYNC(dir))
701 (void)fat_sync_inode(dir);
702 else
703 mark_inode_dirty(dir);
704cleanup:
705 kfree(slots);
706 return err;
707}
708
709static int vfat_find(struct inode *dir, struct qstr *qname,
710 struct fat_slot_info *sinfo)
711{
712 unsigned int len = vfat_striptail_len(qname);
713 if (len == 0)
714 return -ENOENT;
715 return fat_search_long(dir, qname->name, len, sinfo);
716}
717
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900718/*
719 * (nfsd's) anonymous disconnected dentry?
720 * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job).
721 */
722static int vfat_d_anon_disconn(struct dentry *dentry)
723{
724 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
725}
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
728 struct nameidata *nd)
729{
730 struct super_block *sb = dir->i_sb;
731 struct fat_slot_info sinfo;
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800732 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 struct dentry *alias;
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800734 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Linus Torvalds8f593422008-05-19 19:53:01 -0700736 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738 err = vfat_find(dir, &dentry->d_name, &sinfo);
739 if (err) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800740 if (err == -ENOENT) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800741 inode = NULL;
742 goto out;
743 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 goto error;
745 }
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
748 brelse(sinfo.bh);
749 if (IS_ERR(inode)) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800750 err = PTR_ERR(inode);
751 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 }
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800753
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 alias = d_find_alias(inode);
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900755 if (alias && !vfat_d_anon_disconn(alias)) {
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800756 /*
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900757 * This inode has non anonymous-DCACHE_DISCONNECTED
758 * dentry. This means, the user did ->lookup() by an
759 * another name (longname vs 8.3 alias of it) in past.
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800760 *
761 * Switch to new one for reason of locality if possible.
762 */
OGAWA Hirofumi1c13a242008-11-06 12:53:52 -0800763 BUG_ON(d_unhashed(alias));
764 if (!S_ISDIR(inode->i_mode))
765 d_move(alias, dentry);
766 iput(inode);
767 unlock_super(sb);
768 return alias;
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900769 } else
770 dput(alias);
771
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800772out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700773 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 dentry->d_time = dentry->d_parent->d_inode->i_version;
775 dentry = d_splice_alias(inode, dentry);
Al Viro3d239852010-12-18 10:44:00 -0500776 if (dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 dentry->d_time = dentry->d_parent->d_inode->i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 return dentry;
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800779
780error:
781 unlock_super(sb);
782 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}
784
Al Viro4acdaf22011-07-26 01:42:34 -0400785static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 struct nameidata *nd)
787{
788 struct super_block *sb = dir->i_sb;
789 struct inode *inode;
790 struct fat_slot_info sinfo;
791 struct timespec ts;
792 int err;
793
Linus Torvalds8f593422008-05-19 19:53:01 -0700794 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796 ts = CURRENT_TIME_SEC;
797 err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
798 if (err)
799 goto out;
800 dir->i_version++;
801
802 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
803 brelse(sinfo.bh);
804 if (IS_ERR(inode)) {
805 err = PTR_ERR(inode);
806 goto out;
807 }
808 inode->i_version++;
809 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
810 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
811
812 dentry->d_time = dentry->d_parent->d_inode->i_version;
813 d_instantiate(dentry, inode);
814out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700815 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 return err;
817}
818
819static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
820{
821 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700822 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 struct fat_slot_info sinfo;
824 int err;
825
Linus Torvalds8f593422008-05-19 19:53:01 -0700826 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
828 err = fat_dir_empty(inode);
829 if (err)
830 goto out;
831 err = vfat_find(dir, &dentry->d_name, &sinfo);
832 if (err)
833 goto out;
834
835 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
836 if (err)
837 goto out;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700838 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Dave Hansence71ec32006-09-30 23:29:06 -0700840 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
842 fat_detach(inode);
843out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700844 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
846 return err;
847}
848
849static int vfat_unlink(struct inode *dir, struct dentry *dentry)
850{
851 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700852 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 struct fat_slot_info sinfo;
854 int err;
855
Linus Torvalds8f593422008-05-19 19:53:01 -0700856 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 err = vfat_find(dir, &dentry->d_name, &sinfo);
859 if (err)
860 goto out;
861
862 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
863 if (err)
864 goto out;
Dave Hansence71ec32006-09-30 23:29:06 -0700865 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
867 fat_detach(inode);
868out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700869 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871 return err;
872}
873
Al Viro18bb1db2011-07-26 01:41:39 -0400874static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875{
876 struct super_block *sb = dir->i_sb;
877 struct inode *inode;
878 struct fat_slot_info sinfo;
879 struct timespec ts;
880 int err, cluster;
881
Linus Torvalds8f593422008-05-19 19:53:01 -0700882 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
884 ts = CURRENT_TIME_SEC;
885 cluster = fat_alloc_new_dir(dir, &ts);
886 if (cluster < 0) {
887 err = cluster;
888 goto out;
889 }
890 err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
891 if (err)
892 goto out_free;
893 dir->i_version++;
Dave Hansend8c76e62006-09-30 23:29:04 -0700894 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
896 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
897 brelse(sinfo.bh);
898 if (IS_ERR(inode)) {
899 err = PTR_ERR(inode);
900 /* the directory was completed, just return a error */
901 goto out;
902 }
903 inode->i_version++;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200904 set_nlink(inode, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
906 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
907
908 dentry->d_time = dentry->d_parent->d_inode->i_version;
909 d_instantiate(dentry, inode);
910
Linus Torvalds8f593422008-05-19 19:53:01 -0700911 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 return 0;
913
914out_free:
915 fat_free_clusters(dir, cluster);
916out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700917 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 return err;
919}
920
921static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
922 struct inode *new_dir, struct dentry *new_dentry)
923{
924 struct buffer_head *dotdot_bh;
925 struct msdos_dir_entry *dotdot_de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 struct inode *old_inode, *new_inode;
927 struct fat_slot_info old_sinfo, sinfo;
928 struct timespec ts;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800929 loff_t dotdot_i_pos, new_i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 int err, is_dir, update_dotdot, corrupt = 0;
Linus Torvalds8f593422008-05-19 19:53:01 -0700931 struct super_block *sb = old_dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
933 old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
934 old_inode = old_dentry->d_inode;
935 new_inode = new_dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700936 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
938 if (err)
939 goto out;
940
941 is_dir = S_ISDIR(old_inode->i_mode);
942 update_dotdot = (is_dir && old_dir != new_dir);
943 if (update_dotdot) {
944 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
945 &dotdot_i_pos) < 0) {
946 err = -EIO;
947 goto out;
948 }
949 }
950
951 ts = CURRENT_TIME_SEC;
952 if (new_inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 if (is_dir) {
954 err = fat_dir_empty(new_inode);
955 if (err)
956 goto out;
957 }
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800958 new_i_pos = MSDOS_I(new_inode)->i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 fat_detach(new_inode);
960 } else {
961 err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0,
962 &ts, &sinfo);
963 if (err)
964 goto out;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800965 new_i_pos = sinfo.i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 }
967 new_dir->i_version++;
968
969 fat_detach(old_inode);
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800970 fat_attach(old_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 if (IS_DIRSYNC(new_dir)) {
972 err = fat_sync_inode(old_inode);
973 if (err)
974 goto error_inode;
975 } else
976 mark_inode_dirty(old_inode);
977
978 if (update_dotdot) {
979 int start = MSDOS_I(new_dir)->i_logstart;
980 dotdot_de->start = cpu_to_le16(start);
981 dotdot_de->starthi = cpu_to_le16(start >> 16);
Al Virob5224122009-06-07 13:44:36 -0400982 mark_buffer_dirty_inode(dotdot_bh, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 if (IS_DIRSYNC(new_dir)) {
984 err = sync_dirty_buffer(dotdot_bh);
985 if (err)
986 goto error_dotdot;
987 }
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700988 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 if (!new_inode)
Dave Hansend8c76e62006-09-30 23:29:04 -0700990 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 }
992
993 err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */
994 old_sinfo.bh = NULL;
995 if (err)
996 goto error_dotdot;
997 old_dir->i_version++;
998 old_dir->i_ctime = old_dir->i_mtime = ts;
999 if (IS_DIRSYNC(old_dir))
1000 (void)fat_sync_inode(old_dir);
1001 else
1002 mark_inode_dirty(old_dir);
1003
1004 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001005 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 if (is_dir)
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001007 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 new_inode->i_ctime = ts;
1009 }
1010out:
1011 brelse(sinfo.bh);
1012 brelse(dotdot_bh);
1013 brelse(old_sinfo.bh);
Linus Torvalds8f593422008-05-19 19:53:01 -07001014 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
1016 return err;
1017
1018error_dotdot:
1019 /* data cluster is shared, serious corruption */
1020 corrupt = 1;
1021
1022 if (update_dotdot) {
1023 int start = MSDOS_I(old_dir)->i_logstart;
1024 dotdot_de->start = cpu_to_le16(start);
1025 dotdot_de->starthi = cpu_to_le16(start >> 16);
Al Virob5224122009-06-07 13:44:36 -04001026 mark_buffer_dirty_inode(dotdot_bh, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 corrupt |= sync_dirty_buffer(dotdot_bh);
1028 }
1029error_inode:
1030 fat_detach(old_inode);
1031 fat_attach(old_inode, old_sinfo.i_pos);
1032 if (new_inode) {
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -08001033 fat_attach(new_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 if (corrupt)
1035 corrupt |= fat_sync_inode(new_inode);
1036 } else {
1037 /*
1038 * If new entry was not sharing the data cluster, it
1039 * shouldn't be serious corruption.
1040 */
1041 int err2 = fat_remove_entries(new_dir, &sinfo);
1042 if (corrupt)
1043 corrupt |= err2;
1044 sinfo.bh = NULL;
1045 }
1046 if (corrupt < 0) {
Denis Karpov85c78592009-06-04 02:34:22 +09001047 fat_fs_error(new_dir->i_sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 "%s: Filesystem corrupted (i_pos %lld)",
Harvey Harrison8e24eea2008-04-30 00:55:09 -07001049 __func__, sinfo.i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 }
1051 goto out;
1052}
1053
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001054static const struct inode_operations vfat_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 .create = vfat_create,
1056 .lookup = vfat_lookup,
1057 .unlink = vfat_unlink,
1058 .mkdir = vfat_mkdir,
1059 .rmdir = vfat_rmdir,
1060 .rename = vfat_rename,
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -07001061 .setattr = fat_setattr,
OGAWA Hirofumida63fc72006-11-16 01:19:28 -08001062 .getattr = fat_getattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063};
1064
Al Viro3d239852010-12-18 10:44:00 -05001065static void setup(struct super_block *sb)
1066{
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +09001067 MSDOS_SB(sb)->dir_ops = &vfat_dir_inode_operations;
Al Viro3d239852010-12-18 10:44:00 -05001068 if (MSDOS_SB(sb)->options.name_check != 's')
1069 sb->s_d_op = &vfat_ci_dentry_ops;
1070 else
1071 sb->s_d_op = &vfat_dentry_ops;
1072}
1073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074static int vfat_fill_super(struct super_block *sb, void *data, int silent)
1075{
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +09001076 return fat_fill_super(sb, data, silent, 1, setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077}
1078
Al Viro152a0832010-07-25 00:46:55 +04001079static struct dentry *vfat_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001080 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001081 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082{
Al Viro152a0832010-07-25 00:46:55 +04001083 return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084}
1085
1086static struct file_system_type vfat_fs_type = {
1087 .owner = THIS_MODULE,
1088 .name = "vfat",
Al Viro152a0832010-07-25 00:46:55 +04001089 .mount = vfat_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 .kill_sb = kill_block_super,
1091 .fs_flags = FS_REQUIRES_DEV,
1092};
1093
1094static int __init init_vfat_fs(void)
1095{
1096 return register_filesystem(&vfat_fs_type);
1097}
1098
1099static void __exit exit_vfat_fs(void)
1100{
1101 unregister_filesystem(&vfat_fs_type);
1102}
1103
1104MODULE_LICENSE("GPL");
1105MODULE_DESCRIPTION("VFAT filesystem support");
1106MODULE_AUTHOR("Gordon Chaffee");
1107
1108module_init(init_vfat_fs)
1109module_exit(exit_vfat_fs)