blob: 6cc480652433b66a52c42cbcd3bde3f19e348f30 [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
Al Viro0b728e12012-06-10 16:03:43 -040044static int vfat_revalidate(struct dentry *dentry, unsigned int flags)
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080045{
Al Viro0b728e12012-06-10 16:03:43 -040046 if (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
Al Viro0b728e12012-06-10 16:03:43 -040055static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080056{
Al Viro0b728e12012-06-10 16:03:43 -040057 if (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 */
Al Viro0b728e12012-06-10 16:03:43 -040077 if (!flags)
OGAWA Hirofumi1b524672008-11-06 12:53:51 -080078 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 Viro0b728e12012-06-10 16:03:43 -040085 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
Al Viro407938e2011-06-25 21:37:18 -040086 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 {
Namjae Jeon41f0c022012-03-23 15:02:38 -0700524 for (i = 0, ip = name, op = outname, *outlen = 0;
Namjae Jeond533df02012-03-23 15:02:39 -0700525 i < len && *outlen < FAT_LFN_LEN;
Namjae Jeon41f0c022012-03-23 15:02:38 -0700526 *outlen += 1) {
527 if (escape && (*ip == ':')) {
528 if (i > len - 5)
529 return -EINVAL;
530 ec = 0;
531 for (k = 1; k < 5; k++) {
532 nc = ip[k];
533 ec <<= 4;
534 if (nc >= '0' && nc <= '9') {
535 ec |= nc - '0';
536 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 }
Namjae Jeon41f0c022012-03-23 15:02:38 -0700538 if (nc >= 'a' && nc <= 'f') {
539 ec |= nc - ('a' - 10);
540 continue;
541 }
542 if (nc >= 'A' && nc <= 'F') {
543 ec |= nc - ('A' - 10);
544 continue;
545 }
546 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 }
Namjae Jeon41f0c022012-03-23 15:02:38 -0700548 *op++ = ec & 0xFF;
549 *op++ = ec >> 8;
550 ip += 5;
551 i += 5;
552 } else {
553 charlen = nls->char2uni(ip, len - i,
554 (wchar_t *)op);
555 if (charlen < 0)
556 return -EINVAL;
557 ip += charlen;
558 i += charlen;
559 op += 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 }
Namjae Jeon41f0c022012-03-23 15:02:38 -0700562 if (i < len)
563 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 *longlen = *outlen;
567 if (*outlen % 13) {
568 *op++ = 0;
569 *op++ = 0;
570 *outlen += 1;
571 if (*outlen % 13) {
572 fill = 13 - (*outlen % 13);
573 for (i = 0; i < fill; i++) {
574 *op++ = 0xff;
575 *op++ = 0xff;
576 }
577 *outlen += fill;
578 }
579 }
580
581 return 0;
582}
583
584static int vfat_build_slots(struct inode *dir, const unsigned char *name,
585 int len, int is_dir, int cluster,
586 struct timespec *ts,
587 struct msdos_dir_slot *slots, int *nr_slots)
588{
589 struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
590 struct fat_mount_options *opts = &sbi->options;
591 struct msdos_dir_slot *ps;
592 struct msdos_dir_entry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 unsigned char cksum, lcase;
594 unsigned char msdos_name[MSDOS_NAME];
595 wchar_t *uname;
596 __le16 time, date;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800597 u8 time_cs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 int err, ulen, usize, i;
599 loff_t offset;
600
601 *nr_slots = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
OGAWA Hirofumic7a6c4e2008-04-28 02:16:29 -0700603 uname = __getname();
604 if (!uname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 return -ENOMEM;
606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
608 opts->unicode_xlate, opts->utf8, sbi->nls_io);
609 if (err)
610 goto out_free;
611
612 err = vfat_is_used_badchars(uname, ulen);
613 if (err)
614 goto out_free;
615
616 err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
617 msdos_name, &lcase);
618 if (err < 0)
619 goto out_free;
620 else if (err == 1) {
621 de = (struct msdos_dir_entry *)slots;
622 err = 0;
623 goto shortname;
624 }
625
626 /* build the entry of long file name */
OGAWA Hirofumi451cbaa2005-10-30 15:03:49 -0800627 cksum = fat_checksum(msdos_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629 *nr_slots = usize / 13;
630 for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
631 ps->id = i;
632 ps->attr = ATTR_EXT;
633 ps->reserved = 0;
634 ps->alias_checksum = cksum;
635 ps->start = 0;
636 offset = (i - 1) * 13;
637 fatwchar_to16(ps->name0_4, uname + offset, 5);
638 fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
639 fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
640 }
641 slots[0].id |= 0x40;
642 de = (struct msdos_dir_entry *)ps;
643
644shortname:
645 /* build the entry of 8.3 alias name */
646 (*nr_slots)++;
647 memcpy(de->name, msdos_name, MSDOS_NAME);
648 de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
649 de->lcase = lcase;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800650 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 de->time = de->ctime = time;
652 de->date = de->cdate = de->adate = date;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800653 de->ctime_cs = time_cs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 de->start = cpu_to_le16(cluster);
655 de->starthi = cpu_to_le16(cluster >> 16);
656 de->size = 0;
657out_free:
OGAWA Hirofumic7a6c4e2008-04-28 02:16:29 -0700658 __putname(uname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 return err;
660}
661
662static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
663 int cluster, struct timespec *ts,
664 struct fat_slot_info *sinfo)
665{
666 struct msdos_dir_slot *slots;
667 unsigned int len;
668 int err, nr_slots;
669
670 len = vfat_striptail_len(qname);
671 if (len == 0)
672 return -ENOENT;
673
Linus Torvalds8f593422008-05-19 19:53:01 -0700674 slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 if (slots == NULL)
676 return -ENOMEM;
677
678 err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts,
679 slots, &nr_slots);
680 if (err)
681 goto cleanup;
682
683 err = fat_add_entries(dir, slots, nr_slots, sinfo);
684 if (err)
685 goto cleanup;
686
687 /* update timestamp */
688 dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
689 if (IS_DIRSYNC(dir))
690 (void)fat_sync_inode(dir);
691 else
692 mark_inode_dirty(dir);
693cleanup:
694 kfree(slots);
695 return err;
696}
697
698static int vfat_find(struct inode *dir, struct qstr *qname,
699 struct fat_slot_info *sinfo)
700{
701 unsigned int len = vfat_striptail_len(qname);
702 if (len == 0)
703 return -ENOENT;
704 return fat_search_long(dir, qname->name, len, sinfo);
705}
706
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900707/*
708 * (nfsd's) anonymous disconnected dentry?
709 * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job).
710 */
711static int vfat_d_anon_disconn(struct dentry *dentry)
712{
713 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
714}
715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400717 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718{
719 struct super_block *sb = dir->i_sb;
720 struct fat_slot_info sinfo;
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800721 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 struct dentry *alias;
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800723 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
Linus Torvalds8f593422008-05-19 19:53:01 -0700725 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727 err = vfat_find(dir, &dentry->d_name, &sinfo);
728 if (err) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800729 if (err == -ENOENT) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800730 inode = NULL;
731 goto out;
732 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 goto error;
734 }
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
737 brelse(sinfo.bh);
738 if (IS_ERR(inode)) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800739 err = PTR_ERR(inode);
740 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 }
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 alias = d_find_alias(inode);
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900744 if (alias && !vfat_d_anon_disconn(alias)) {
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800745 /*
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900746 * This inode has non anonymous-DCACHE_DISCONNECTED
747 * dentry. This means, the user did ->lookup() by an
748 * another name (longname vs 8.3 alias of it) in past.
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800749 *
750 * Switch to new one for reason of locality if possible.
751 */
OGAWA Hirofumi1c13a242008-11-06 12:53:52 -0800752 BUG_ON(d_unhashed(alias));
753 if (!S_ISDIR(inode->i_mode))
754 d_move(alias, dentry);
755 iput(inode);
756 unlock_super(sb);
757 return alias;
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900758 } else
759 dput(alias);
760
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800761out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700762 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 dentry->d_time = dentry->d_parent->d_inode->i_version;
764 dentry = d_splice_alias(inode, dentry);
Al Viro3d239852010-12-18 10:44:00 -0500765 if (dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 dentry->d_time = dentry->d_parent->d_inode->i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 return dentry;
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800768
769error:
770 unlock_super(sb);
771 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
Al Viro4acdaf22011-07-26 01:42:34 -0400774static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400775 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
777 struct super_block *sb = dir->i_sb;
778 struct inode *inode;
779 struct fat_slot_info sinfo;
780 struct timespec ts;
781 int err;
782
Linus Torvalds8f593422008-05-19 19:53:01 -0700783 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 ts = CURRENT_TIME_SEC;
786 err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
787 if (err)
788 goto out;
789 dir->i_version++;
790
791 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
792 brelse(sinfo.bh);
793 if (IS_ERR(inode)) {
794 err = PTR_ERR(inode);
795 goto out;
796 }
797 inode->i_version++;
798 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
799 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
800
801 dentry->d_time = dentry->d_parent->d_inode->i_version;
802 d_instantiate(dentry, inode);
803out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700804 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 return err;
806}
807
808static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
809{
810 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700811 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 struct fat_slot_info sinfo;
813 int err;
814
Linus Torvalds8f593422008-05-19 19:53:01 -0700815 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
817 err = fat_dir_empty(inode);
818 if (err)
819 goto out;
820 err = vfat_find(dir, &dentry->d_name, &sinfo);
821 if (err)
822 goto out;
823
824 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
825 if (err)
826 goto out;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700827 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Dave Hansence71ec32006-09-30 23:29:06 -0700829 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
831 fat_detach(inode);
832out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700833 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835 return err;
836}
837
838static int vfat_unlink(struct inode *dir, struct dentry *dentry)
839{
840 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700841 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 struct fat_slot_info sinfo;
843 int err;
844
Linus Torvalds8f593422008-05-19 19:53:01 -0700845 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847 err = vfat_find(dir, &dentry->d_name, &sinfo);
848 if (err)
849 goto out;
850
851 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
852 if (err)
853 goto out;
Dave Hansence71ec32006-09-30 23:29:06 -0700854 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
856 fat_detach(inode);
857out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700858 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
860 return err;
861}
862
Al Viro18bb1db2011-07-26 01:41:39 -0400863static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864{
865 struct super_block *sb = dir->i_sb;
866 struct inode *inode;
867 struct fat_slot_info sinfo;
868 struct timespec ts;
869 int err, cluster;
870
Linus Torvalds8f593422008-05-19 19:53:01 -0700871 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
873 ts = CURRENT_TIME_SEC;
874 cluster = fat_alloc_new_dir(dir, &ts);
875 if (cluster < 0) {
876 err = cluster;
877 goto out;
878 }
879 err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
880 if (err)
881 goto out_free;
882 dir->i_version++;
Dave Hansend8c76e62006-09-30 23:29:04 -0700883 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
885 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
886 brelse(sinfo.bh);
887 if (IS_ERR(inode)) {
888 err = PTR_ERR(inode);
889 /* the directory was completed, just return a error */
890 goto out;
891 }
892 inode->i_version++;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200893 set_nlink(inode, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
895 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
896
897 dentry->d_time = dentry->d_parent->d_inode->i_version;
898 d_instantiate(dentry, inode);
899
Linus Torvalds8f593422008-05-19 19:53:01 -0700900 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 return 0;
902
903out_free:
904 fat_free_clusters(dir, cluster);
905out:
Linus Torvalds8f593422008-05-19 19:53:01 -0700906 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 return err;
908}
909
910static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
911 struct inode *new_dir, struct dentry *new_dentry)
912{
913 struct buffer_head *dotdot_bh;
914 struct msdos_dir_entry *dotdot_de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 struct inode *old_inode, *new_inode;
916 struct fat_slot_info old_sinfo, sinfo;
917 struct timespec ts;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800918 loff_t dotdot_i_pos, new_i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 int err, is_dir, update_dotdot, corrupt = 0;
Linus Torvalds8f593422008-05-19 19:53:01 -0700920 struct super_block *sb = old_dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
922 old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
923 old_inode = old_dentry->d_inode;
924 new_inode = new_dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700925 lock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
927 if (err)
928 goto out;
929
930 is_dir = S_ISDIR(old_inode->i_mode);
931 update_dotdot = (is_dir && old_dir != new_dir);
932 if (update_dotdot) {
933 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
934 &dotdot_i_pos) < 0) {
935 err = -EIO;
936 goto out;
937 }
938 }
939
940 ts = CURRENT_TIME_SEC;
941 if (new_inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 if (is_dir) {
943 err = fat_dir_empty(new_inode);
944 if (err)
945 goto out;
946 }
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800947 new_i_pos = MSDOS_I(new_inode)->i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 fat_detach(new_inode);
949 } else {
950 err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0,
951 &ts, &sinfo);
952 if (err)
953 goto out;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800954 new_i_pos = sinfo.i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 }
956 new_dir->i_version++;
957
958 fat_detach(old_inode);
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800959 fat_attach(old_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 if (IS_DIRSYNC(new_dir)) {
961 err = fat_sync_inode(old_inode);
962 if (err)
963 goto error_inode;
964 } else
965 mark_inode_dirty(old_inode);
966
967 if (update_dotdot) {
968 int start = MSDOS_I(new_dir)->i_logstart;
969 dotdot_de->start = cpu_to_le16(start);
970 dotdot_de->starthi = cpu_to_le16(start >> 16);
Al Virob5224122009-06-07 13:44:36 -0400971 mark_buffer_dirty_inode(dotdot_bh, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 if (IS_DIRSYNC(new_dir)) {
973 err = sync_dirty_buffer(dotdot_bh);
974 if (err)
975 goto error_dotdot;
976 }
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700977 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 if (!new_inode)
Dave Hansend8c76e62006-09-30 23:29:04 -0700979 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 }
981
982 err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */
983 old_sinfo.bh = NULL;
984 if (err)
985 goto error_dotdot;
986 old_dir->i_version++;
987 old_dir->i_ctime = old_dir->i_mtime = ts;
988 if (IS_DIRSYNC(old_dir))
989 (void)fat_sync_inode(old_dir);
990 else
991 mark_inode_dirty(old_dir);
992
993 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700994 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 if (is_dir)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700996 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 new_inode->i_ctime = ts;
998 }
999out:
1000 brelse(sinfo.bh);
1001 brelse(dotdot_bh);
1002 brelse(old_sinfo.bh);
Linus Torvalds8f593422008-05-19 19:53:01 -07001003 unlock_super(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
1005 return err;
1006
1007error_dotdot:
1008 /* data cluster is shared, serious corruption */
1009 corrupt = 1;
1010
1011 if (update_dotdot) {
1012 int start = MSDOS_I(old_dir)->i_logstart;
1013 dotdot_de->start = cpu_to_le16(start);
1014 dotdot_de->starthi = cpu_to_le16(start >> 16);
Al Virob5224122009-06-07 13:44:36 -04001015 mark_buffer_dirty_inode(dotdot_bh, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 corrupt |= sync_dirty_buffer(dotdot_bh);
1017 }
1018error_inode:
1019 fat_detach(old_inode);
1020 fat_attach(old_inode, old_sinfo.i_pos);
1021 if (new_inode) {
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -08001022 fat_attach(new_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 if (corrupt)
1024 corrupt |= fat_sync_inode(new_inode);
1025 } else {
1026 /*
1027 * If new entry was not sharing the data cluster, it
1028 * shouldn't be serious corruption.
1029 */
1030 int err2 = fat_remove_entries(new_dir, &sinfo);
1031 if (corrupt)
1032 corrupt |= err2;
1033 sinfo.bh = NULL;
1034 }
1035 if (corrupt < 0) {
Denis Karpov85c78592009-06-04 02:34:22 +09001036 fat_fs_error(new_dir->i_sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 "%s: Filesystem corrupted (i_pos %lld)",
Harvey Harrison8e24eea2008-04-30 00:55:09 -07001038 __func__, sinfo.i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 }
1040 goto out;
1041}
1042
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001043static const struct inode_operations vfat_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 .create = vfat_create,
1045 .lookup = vfat_lookup,
1046 .unlink = vfat_unlink,
1047 .mkdir = vfat_mkdir,
1048 .rmdir = vfat_rmdir,
1049 .rename = vfat_rename,
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -07001050 .setattr = fat_setattr,
OGAWA Hirofumida63fc72006-11-16 01:19:28 -08001051 .getattr = fat_getattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052};
1053
Al Viro3d239852010-12-18 10:44:00 -05001054static void setup(struct super_block *sb)
1055{
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +09001056 MSDOS_SB(sb)->dir_ops = &vfat_dir_inode_operations;
Al Viro3d239852010-12-18 10:44:00 -05001057 if (MSDOS_SB(sb)->options.name_check != 's')
1058 sb->s_d_op = &vfat_ci_dentry_ops;
1059 else
1060 sb->s_d_op = &vfat_dentry_ops;
1061}
1062
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063static int vfat_fill_super(struct super_block *sb, void *data, int silent)
1064{
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +09001065 return fat_fill_super(sb, data, silent, 1, setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066}
1067
Al Viro152a0832010-07-25 00:46:55 +04001068static struct dentry *vfat_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001069 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001070 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071{
Al Viro152a0832010-07-25 00:46:55 +04001072 return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073}
1074
1075static struct file_system_type vfat_fs_type = {
1076 .owner = THIS_MODULE,
1077 .name = "vfat",
Al Viro152a0832010-07-25 00:46:55 +04001078 .mount = vfat_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 .kill_sb = kill_block_super,
1080 .fs_flags = FS_REQUIRES_DEV,
1081};
1082
1083static int __init init_vfat_fs(void)
1084{
1085 return register_filesystem(&vfat_fs_type);
1086}
1087
1088static void __exit exit_vfat_fs(void)
1089{
1090 unregister_filesystem(&vfat_fs_type);
1091}
1092
1093MODULE_LICENSE("GPL");
1094MODULE_DESCRIPTION("VFAT filesystem support");
1095MODULE_AUTHOR("Gordon Chaffee");
1096
1097module_init(init_vfat_fs)
1098module_exit(exit_vfat_fs)