blob: b8b92c2f96834baa310a20b007557f1b9e69ae91 [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 */
Linus Torvaldsda53be12013-05-21 15:22:44 -0700110static int vfat_hash(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
113 return 0;
114}
115
116/*
117 * Compute the hash for the vfat name corresponding to the dentry.
118 * Note: if the name is invalid, we leave the hash code unchanged so
119 * that the existing dentry can be used. The vfat fs routines will
120 * return ENOENT or EINVAL as appropriate.
121 */
Linus Torvaldsda53be12013-05-21 15:22:44 -0700122static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
Nick Pigginb1e6a012011-01-07 17:49:28 +1100124 struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 const unsigned char *name;
126 unsigned int len;
127 unsigned long hash;
128
129 name = qstr->name;
130 len = vfat_striptail_len(qstr);
131
132 hash = init_name_hash();
133 while (len--)
134 hash = partial_name_hash(nls_tolower(t, *name++), hash);
135 qstr->hash = end_name_hash(hash);
136
137 return 0;
138}
139
140/*
141 * Case insensitive compare of two vfat names.
142 */
Linus Torvaldsda53be12013-05-21 15:22:44 -0700143static int vfat_cmpi(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100144 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
Nick Piggin621e1552011-01-07 17:49:27 +1100146 struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 unsigned int alen, blen;
148
149 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100150 alen = vfat_striptail_len(name);
151 blen = __vfat_striptail_len(len, str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100153 if (nls_strnicmp(t, name->name, str, alen) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return 0;
155 }
156 return 1;
157}
158
159/*
160 * Case sensitive compare of two vfat names.
161 */
Linus Torvaldsda53be12013-05-21 15:22:44 -0700162static int vfat_cmp(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100163 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 unsigned int alen, blen;
166
167 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100168 alen = vfat_striptail_len(name);
169 blen = __vfat_striptail_len(len, str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100171 if (strncmp(name->name, str, alen) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return 0;
173 }
174 return 1;
175}
176
Al Viroce6cdc42009-02-20 05:59:46 +0000177static const struct dentry_operations vfat_ci_dentry_ops = {
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800178 .d_revalidate = vfat_revalidate_ci,
179 .d_hash = vfat_hashi,
180 .d_compare = vfat_cmpi,
181};
182
Al Viroce6cdc42009-02-20 05:59:46 +0000183static const struct dentry_operations vfat_dentry_ops = {
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800184 .d_revalidate = vfat_revalidate,
185 .d_hash = vfat_hash,
186 .d_compare = vfat_cmp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187};
188
189/* Characters that are undesirable in an MS-DOS file name */
190
191static inline wchar_t vfat_bad_char(wchar_t w)
192{
193 return (w < 0x0020)
194 || (w == '*') || (w == '?') || (w == '<') || (w == '>')
195 || (w == '|') || (w == '"') || (w == ':') || (w == '/')
196 || (w == '\\');
197}
198
199static inline wchar_t vfat_replace_char(wchar_t w)
200{
201 return (w == '[') || (w == ']') || (w == ';') || (w == ',')
202 || (w == '+') || (w == '=');
203}
204
205static wchar_t vfat_skip_char(wchar_t w)
206{
207 return (w == '.') || (w == ' ');
208}
209
210static inline int vfat_is_used_badchars(const wchar_t *s, int len)
211{
212 int i;
213
214 for (i = 0; i < len; i++)
215 if (vfat_bad_char(s[i]))
216 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Keith Mokf22032b2008-04-28 02:16:29 -0700218 if (s[i - 1] == ' ') /* last character cannot be space */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return -EINVAL;
Keith Mokf22032b2008-04-28 02:16:29 -0700220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return 0;
222}
223
224static int vfat_find_form(struct inode *dir, unsigned char *name)
225{
226 struct fat_slot_info sinfo;
227 int err = fat_scan(dir, name, &sinfo);
228 if (err)
229 return -ENOENT;
230 brelse(sinfo.bh);
231 return 0;
232}
233
234/*
235 * 1) Valid characters for the 8.3 format alias are any combination of
236 * letters, uppercase alphabets, digits, any of the
237 * following special characters:
238 * $ % ' ` - @ { } ~ ! # ( ) & _ ^
239 * In this case Longfilename is not stored in disk.
240 *
241 * WinNT's Extension:
242 * File name and extension name is contain uppercase/lowercase
243 * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT.
244 *
245 * 2) File name is 8.3 format, but it contain the uppercase and
246 * lowercase char, muliti bytes char, etc. In this case numtail is not
247 * added, but Longfilename is stored.
248 *
249 * 3) When the one except for the above, or the following special
250 * character are contained:
251 * . [ ] ; , + =
252 * numtail is added, and Longfilename must be stored in disk .
253 */
254struct shortname_info {
255 unsigned char lower:1,
256 upper:1,
257 valid:1;
258};
259#define INIT_SHORTNAME_INFO(x) do { \
260 (x)->lower = 1; \
261 (x)->upper = 1; \
262 (x)->valid = 1; \
263} while (0)
264
265static inline int to_shortname_char(struct nls_table *nls,
266 unsigned char *buf, int buf_size,
267 wchar_t *src, struct shortname_info *info)
268{
269 int len;
270
271 if (vfat_skip_char(*src)) {
272 info->valid = 0;
273 return 0;
274 }
275 if (vfat_replace_char(*src)) {
276 info->valid = 0;
277 buf[0] = '_';
278 return 1;
279 }
280
281 len = nls->uni2char(*src, buf, buf_size);
282 if (len <= 0) {
283 info->valid = 0;
284 buf[0] = '_';
285 len = 1;
286 } else if (len == 1) {
287 unsigned char prev = buf[0];
288
289 if (buf[0] >= 0x7F) {
290 info->lower = 0;
291 info->upper = 0;
292 }
293
294 buf[0] = nls_toupper(nls, buf[0]);
295 if (isalpha(buf[0])) {
296 if (buf[0] == prev)
297 info->lower = 0;
298 else
299 info->upper = 0;
300 }
301 } else {
302 info->lower = 0;
303 info->upper = 0;
304 }
305
306 return len;
307}
308
309/*
310 * Given a valid longname, create a unique shortname. Make sure the
311 * shortname does not exist
312 * Returns negative number on error, 0 for a normal
313 * return, and 1 for valid shortname
314 */
315static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
316 wchar_t *uname, int ulen,
317 unsigned char *name_res, unsigned char *lcase)
318{
319 struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
320 wchar_t *ip, *ext_start, *end, *name_start;
Nikolaus Schulz30d18722010-04-01 02:21:10 +0900321 unsigned char base[9], ext[4], buf[5], *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 unsigned char charbuf[NLS_MAX_CHARSET_SIZE];
323 int chl, chi;
324 int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen;
325 int is_shortname;
326 struct shortname_info base_info, ext_info;
327
328 is_shortname = 1;
329 INIT_SHORTNAME_INFO(&base_info);
330 INIT_SHORTNAME_INFO(&ext_info);
331
332 /* Now, we need to create a shortname from the long name */
333 ext_start = end = &uname[ulen];
334 while (--ext_start >= uname) {
335 if (*ext_start == 0x002E) { /* is `.' */
336 if (ext_start == end - 1) {
337 sz = ulen;
338 ext_start = NULL;
339 }
340 break;
341 }
342 }
343
344 if (ext_start == uname - 1) {
345 sz = ulen;
346 ext_start = NULL;
347 } else if (ext_start) {
348 /*
349 * Names which start with a dot could be just
350 * an extension eg. "...test". In this case Win95
351 * uses the extension as the name and sets no extension.
352 */
353 name_start = &uname[0];
354 while (name_start < ext_start) {
355 if (!vfat_skip_char(*name_start))
356 break;
357 name_start++;
358 }
359 if (name_start != ext_start) {
360 sz = ext_start - uname;
361 ext_start++;
362 } else {
363 sz = ulen;
364 ext_start = NULL;
365 }
366 }
367
368 numtail_baselen = 6;
369 numtail2_baselen = 2;
370 for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) {
371 chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
372 ip, &base_info);
373 if (chl == 0)
374 continue;
375
376 if (baselen < 2 && (baselen + chl) > 2)
377 numtail2_baselen = baselen;
378 if (baselen < 6 && (baselen + chl) > 6)
379 numtail_baselen = baselen;
380 for (chi = 0; chi < chl; chi++) {
381 *p++ = charbuf[chi];
382 baselen++;
383 if (baselen >= 8)
384 break;
385 }
386 if (baselen >= 8) {
387 if ((chi < chl - 1) || (ip + 1) - uname < sz)
388 is_shortname = 0;
389 break;
390 }
391 }
392 if (baselen == 0) {
393 return -EINVAL;
394 }
395
396 extlen = 0;
397 if (ext_start) {
398 for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
399 chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
400 ip, &ext_info);
401 if (chl == 0)
402 continue;
403
404 if ((extlen + chl) > 3) {
405 is_shortname = 0;
406 break;
407 }
408 for (chi = 0; chi < chl; chi++) {
409 *p++ = charbuf[chi];
410 extlen++;
411 }
412 if (extlen >= 3) {
413 if (ip + 1 != end)
414 is_shortname = 0;
415 break;
416 }
417 }
418 }
419 ext[extlen] = '\0';
420 base[baselen] = '\0';
421
422 /* Yes, it can happen. ".\xe5" would do it. */
423 if (base[0] == DELETED_FLAG)
424 base[0] = 0x05;
425
426 /* OK, at this point we know that base is not longer than 8 symbols,
427 * ext is not longer than 3, base is nonempty, both don't contain
428 * any bad symbols (lowercase transformed to uppercase).
429 */
430
431 memset(name_res, ' ', MSDOS_NAME);
432 memcpy(name_res, base, baselen);
433 memcpy(name_res + 8, ext, extlen);
434 *lcase = 0;
435 if (is_shortname && base_info.valid && ext_info.valid) {
436 if (vfat_find_form(dir, name_res) == 0)
437 return -EEXIST;
438
439 if (opts->shortname & VFAT_SFN_CREATE_WIN95) {
440 return (base_info.upper && ext_info.upper);
441 } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) {
442 if ((base_info.upper || base_info.lower) &&
443 (ext_info.upper || ext_info.lower)) {
444 if (!base_info.upper && base_info.lower)
445 *lcase |= CASE_LOWER_BASE;
446 if (!ext_info.upper && ext_info.lower)
447 *lcase |= CASE_LOWER_EXT;
448 return 1;
449 }
450 return 0;
451 } else {
452 BUG();
453 }
454 }
455
456 if (opts->numtail == 0)
457 if (vfat_find_form(dir, name_res) < 0)
458 return 0;
459
460 /*
461 * Try to find a unique extension. This used to
462 * iterate through all possibilities sequentially,
463 * but that gave extremely bad performance. Windows
464 * only tries a few cases before using random
465 * values for part of the base.
466 */
467
468 if (baselen > 6) {
469 baselen = numtail_baselen;
470 name_res[7] = ' ';
471 }
472 name_res[baselen] = '~';
473 for (i = 1; i < 10; i++) {
474 name_res[baselen + 1] = i + '0';
475 if (vfat_find_form(dir, name_res) < 0)
476 return 0;
477 }
478
Nikolaus Schulz30d18722010-04-01 02:21:10 +0900479 i = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 sz = (jiffies >> 16) & 0x7;
481 if (baselen > 2) {
482 baselen = numtail2_baselen;
483 name_res[7] = ' ';
484 }
485 name_res[baselen + 4] = '~';
486 name_res[baselen + 5] = '1' + sz;
487 while (1) {
Nikolaus Schulz30d18722010-04-01 02:21:10 +0900488 snprintf(buf, sizeof(buf), "%04X", i & 0xffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 memcpy(&name_res[baselen], buf, 4);
490 if (vfat_find_form(dir, name_res) < 0)
491 break;
492 i -= 11;
493 }
494 return 0;
495}
496
497/* Translate a string, including coded sequences into Unicode */
498static int
499xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
500 int *longlen, int *outlen, int escape, int utf8,
501 struct nls_table *nls)
502{
503 const unsigned char *ip;
504 unsigned char nc;
505 unsigned char *op;
506 unsigned int ec;
507 int i, k, fill;
508 int charlen;
509
510 if (utf8) {
Alan Stern0720a062011-11-17 16:42:19 -0500511 *outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN,
512 (wchar_t *) outname, FAT_LFN_LEN + 2);
OGAWA Hirofumi67638e42009-08-01 21:30:31 +0900513 if (*outlen < 0)
514 return *outlen;
Kevin Dankwardteeb5b4a2010-02-10 23:43:40 +0900515 else if (*outlen > FAT_LFN_LEN)
Keith Mokf22032b2008-04-28 02:16:29 -0700516 return -ENAMETOOLONG;
517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 op = &outname[*outlen * sizeof(wchar_t)];
519 } else {
Namjae Jeon41f0c022012-03-23 15:02:38 -0700520 for (i = 0, ip = name, op = outname, *outlen = 0;
Namjae Jeond533df02012-03-23 15:02:39 -0700521 i < len && *outlen < FAT_LFN_LEN;
Namjae Jeon41f0c022012-03-23 15:02:38 -0700522 *outlen += 1) {
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 }
Namjae Jeon41f0c022012-03-23 15:02:38 -0700534 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
Namjae Jeon41f0c022012-03-23 15:02:38 -0700544 *op++ = ec & 0xFF;
545 *op++ = ec >> 8;
546 ip += 5;
547 i += 5;
548 } else {
549 charlen = nls->char2uni(ip, len - i,
550 (wchar_t *)op);
551 if (charlen < 0)
552 return -EINVAL;
553 ip += charlen;
554 i += charlen;
555 op += 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
Namjae Jeon41f0c022012-03-23 15:02:38 -0700558 if (i < len)
559 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 *longlen = *outlen;
563 if (*outlen % 13) {
564 *op++ = 0;
565 *op++ = 0;
566 *outlen += 1;
567 if (*outlen % 13) {
568 fill = 13 - (*outlen % 13);
569 for (i = 0; i < fill; i++) {
570 *op++ = 0xff;
571 *op++ = 0xff;
572 }
573 *outlen += fill;
574 }
575 }
576
577 return 0;
578}
579
580static int vfat_build_slots(struct inode *dir, const unsigned char *name,
581 int len, int is_dir, int cluster,
582 struct timespec *ts,
583 struct msdos_dir_slot *slots, int *nr_slots)
584{
585 struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
586 struct fat_mount_options *opts = &sbi->options;
587 struct msdos_dir_slot *ps;
588 struct msdos_dir_entry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 unsigned char cksum, lcase;
590 unsigned char msdos_name[MSDOS_NAME];
591 wchar_t *uname;
592 __le16 time, date;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800593 u8 time_cs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 int err, ulen, usize, i;
595 loff_t offset;
596
597 *nr_slots = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
OGAWA Hirofumic7a6c4e2008-04-28 02:16:29 -0700599 uname = __getname();
600 if (!uname)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 return -ENOMEM;
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
604 opts->unicode_xlate, opts->utf8, sbi->nls_io);
605 if (err)
606 goto out_free;
607
608 err = vfat_is_used_badchars(uname, ulen);
609 if (err)
610 goto out_free;
611
612 err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
613 msdos_name, &lcase);
614 if (err < 0)
615 goto out_free;
616 else if (err == 1) {
617 de = (struct msdos_dir_entry *)slots;
618 err = 0;
619 goto shortname;
620 }
621
622 /* build the entry of long file name */
OGAWA Hirofumi451cbaa2005-10-30 15:03:49 -0800623 cksum = fat_checksum(msdos_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625 *nr_slots = usize / 13;
626 for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
627 ps->id = i;
628 ps->attr = ATTR_EXT;
629 ps->reserved = 0;
630 ps->alias_checksum = cksum;
631 ps->start = 0;
632 offset = (i - 1) * 13;
633 fatwchar_to16(ps->name0_4, uname + offset, 5);
634 fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
635 fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
636 }
637 slots[0].id |= 0x40;
638 de = (struct msdos_dir_entry *)ps;
639
640shortname:
641 /* build the entry of 8.3 alias name */
642 (*nr_slots)++;
643 memcpy(de->name, msdos_name, MSDOS_NAME);
644 de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
645 de->lcase = lcase;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800646 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 de->time = de->ctime = time;
648 de->date = de->cdate = de->adate = date;
OGAWA Hirofumi7decd1c2008-11-06 12:53:47 -0800649 de->ctime_cs = time_cs;
Steven J. Magnania943ed72012-07-30 14:42:13 -0700650 fat_set_start(de, cluster);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 de->size = 0;
652out_free:
OGAWA Hirofumic7a6c4e2008-04-28 02:16:29 -0700653 __putname(uname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 return err;
655}
656
657static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
658 int cluster, struct timespec *ts,
659 struct fat_slot_info *sinfo)
660{
661 struct msdos_dir_slot *slots;
662 unsigned int len;
663 int err, nr_slots;
664
665 len = vfat_striptail_len(qname);
666 if (len == 0)
667 return -ENOENT;
668
Linus Torvalds8f593422008-05-19 19:53:01 -0700669 slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 if (slots == NULL)
671 return -ENOMEM;
672
673 err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts,
674 slots, &nr_slots);
675 if (err)
676 goto cleanup;
677
678 err = fat_add_entries(dir, slots, nr_slots, sinfo);
679 if (err)
680 goto cleanup;
681
682 /* update timestamp */
683 dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
684 if (IS_DIRSYNC(dir))
685 (void)fat_sync_inode(dir);
686 else
687 mark_inode_dirty(dir);
688cleanup:
689 kfree(slots);
690 return err;
691}
692
693static int vfat_find(struct inode *dir, struct qstr *qname,
694 struct fat_slot_info *sinfo)
695{
696 unsigned int len = vfat_striptail_len(qname);
697 if (len == 0)
698 return -ENOENT;
699 return fat_search_long(dir, qname->name, len, sinfo);
700}
701
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900702/*
703 * (nfsd's) anonymous disconnected dentry?
704 * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job).
705 */
706static int vfat_d_anon_disconn(struct dentry *dentry)
707{
708 return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED);
709}
710
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400712 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713{
714 struct super_block *sb = dir->i_sb;
715 struct fat_slot_info sinfo;
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800716 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 struct dentry *alias;
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800718 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Marco Stornellie40b34c2012-10-06 12:40:03 +0200720 mutex_lock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722 err = vfat_find(dir, &dentry->d_name, &sinfo);
723 if (err) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800724 if (err == -ENOENT) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800725 inode = NULL;
726 goto out;
727 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 goto error;
729 }
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
732 brelse(sinfo.bh);
733 if (IS_ERR(inode)) {
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800734 err = PTR_ERR(inode);
735 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 }
OGAWA Hirofumi1b524672008-11-06 12:53:51 -0800737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 alias = d_find_alias(inode);
Al Viro1ead0e72014-12-02 15:59:37 -0800739 /*
740 * Checking "alias->d_parent == dentry->d_parent" to make sure
741 * FS is not corrupted (especially double linked dir).
742 */
743 if (alias && alias->d_parent == dentry->d_parent &&
744 !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);
Marco Stornellie40b34c2012-10-06 12:40:03 +0200756 mutex_unlock(&MSDOS_SB(sb)->s_lock);
OGAWA Hirofumi1c13a242008-11-06 12:53:52 -0800757 return alias;
OGAWA Hirofumi8045e292010-01-12 03:32:24 +0900758 } else
759 dput(alias);
760
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800761out:
Marco Stornellie40b34c2012-10-06 12:40:03 +0200762 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Al Viro1ead0e72014-12-02 15:59:37 -0800763 if (!inode)
764 dentry->d_time = dir->i_version;
765 return d_splice_alias(inode, dentry);
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800766error:
Marco Stornellie40b34c2012-10-06 12:40:03 +0200767 mutex_unlock(&MSDOS_SB(sb)->s_lock);
OGAWA Hirofumi068f5ae2008-11-06 12:53:51 -0800768 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
Al Viro4acdaf22011-07-26 01:42:34 -0400771static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400772 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773{
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
Marco Stornellie40b34c2012-10-06 12:40:03 +0200780 mutex_lock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 d_instantiate(dentry, inode);
799out:
Marco Stornellie40b34c2012-10-06 12:40:03 +0200800 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 return err;
802}
803
804static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
805{
806 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700807 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 struct fat_slot_info sinfo;
809 int err;
810
Marco Stornellie40b34c2012-10-06 12:40:03 +0200811 mutex_lock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
813 err = fat_dir_empty(inode);
814 if (err)
815 goto out;
816 err = vfat_find(dir, &dentry->d_name, &sinfo);
817 if (err)
818 goto out;
819
820 err = fat_remove_entries(dir, &sinfo); /* and releases bh */
821 if (err)
822 goto out;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700823 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Dave Hansence71ec32006-09-30 23:29:06 -0700825 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
827 fat_detach(inode);
Al Viro1ead0e72014-12-02 15:59:37 -0800828 dentry->d_time = dir->i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829out:
Marco Stornellie40b34c2012-10-06 12:40:03 +0200830 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 return err;
833}
834
835static int vfat_unlink(struct inode *dir, struct dentry *dentry)
836{
837 struct inode *inode = dentry->d_inode;
Linus Torvalds8f593422008-05-19 19:53:01 -0700838 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 struct fat_slot_info sinfo;
840 int err;
841
Marco Stornellie40b34c2012-10-06 12:40:03 +0200842 mutex_lock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
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 Hansence71ec32006-09-30 23:29:06 -0700851 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
853 fat_detach(inode);
Al Viro1ead0e72014-12-02 15:59:37 -0800854 dentry->d_time = dir->i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855out:
Marco Stornellie40b34c2012-10-06 12:40:03 +0200856 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 return err;
859}
860
Al Viro18bb1db2011-07-26 01:41:39 -0400861static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862{
863 struct super_block *sb = dir->i_sb;
864 struct inode *inode;
865 struct fat_slot_info sinfo;
866 struct timespec ts;
867 int err, cluster;
868
Marco Stornellie40b34c2012-10-06 12:40:03 +0200869 mutex_lock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871 ts = CURRENT_TIME_SEC;
872 cluster = fat_alloc_new_dir(dir, &ts);
873 if (cluster < 0) {
874 err = cluster;
875 goto out;
876 }
877 err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
878 if (err)
879 goto out_free;
880 dir->i_version++;
Dave Hansend8c76e62006-09-30 23:29:04 -0700881 inc_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
883 inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
884 brelse(sinfo.bh);
885 if (IS_ERR(inode)) {
886 err = PTR_ERR(inode);
887 /* the directory was completed, just return a error */
888 goto out;
889 }
890 inode->i_version++;
Miklos Szeredibfe86842011-10-28 14:13:29 +0200891 set_nlink(inode, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
893 /* timestamp is already written, so mark_inode_dirty() is unneeded. */
894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 d_instantiate(dentry, inode);
896
Marco Stornellie40b34c2012-10-06 12:40:03 +0200897 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 return 0;
899
900out_free:
901 fat_free_clusters(dir, cluster);
902out:
Marco Stornellie40b34c2012-10-06 12:40:03 +0200903 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 return err;
905}
906
907static 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 Torvalds1da177e2005-04-16 15:20:36 -0700912 struct inode *old_inode, *new_inode;
913 struct fat_slot_info old_sinfo, sinfo;
914 struct timespec ts;
Steven J. Magnani7669e8f2012-10-04 17:14:45 -0700915 loff_t new_i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 int err, is_dir, update_dotdot, corrupt = 0;
Linus Torvalds8f593422008-05-19 19:53:01 -0700917 struct super_block *sb = old_dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
920 old_inode = old_dentry->d_inode;
921 new_inode = new_dentry->d_inode;
Marco Stornellie40b34c2012-10-06 12:40:03 +0200922 mutex_lock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 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) {
Steven J. Magnani7669e8f2012-10-04 17:14:45 -0700930 if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 err = -EIO;
932 goto out;
933 }
934 }
935
936 ts = CURRENT_TIME_SEC;
937 if (new_inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 if (is_dir) {
939 err = fat_dir_empty(new_inode);
940 if (err)
941 goto out;
942 }
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800943 new_i_pos = MSDOS_I(new_inode)->i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 fat_detach(new_inode);
945 } else {
946 err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0,
947 &ts, &sinfo);
948 if (err)
949 goto out;
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800950 new_i_pos = sinfo.i_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 }
952 new_dir->i_version++;
953
954 fat_detach(old_inode);
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -0800955 fat_attach(old_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 if (IS_DIRSYNC(new_dir)) {
957 err = fat_sync_inode(old_inode);
958 if (err)
959 goto error_inode;
960 } else
961 mark_inode_dirty(old_inode);
962
963 if (update_dotdot) {
Steven J. Magnania943ed72012-07-30 14:42:13 -0700964 fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
Al Virob5224122009-06-07 13:44:36 -0400965 mark_buffer_dirty_inode(dotdot_bh, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 if (IS_DIRSYNC(new_dir)) {
967 err = sync_dirty_buffer(dotdot_bh);
968 if (err)
969 goto error_dotdot;
970 }
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700971 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 if (!new_inode)
Dave Hansend8c76e62006-09-30 23:29:04 -0700973 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 }
975
976 err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */
977 old_sinfo.bh = NULL;
978 if (err)
979 goto error_dotdot;
980 old_dir->i_version++;
981 old_dir->i_ctime = old_dir->i_mtime = ts;
982 if (IS_DIRSYNC(old_dir))
983 (void)fat_sync_inode(old_dir);
984 else
985 mark_inode_dirty(old_dir);
986
987 if (new_inode) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700988 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 if (is_dir)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700990 drop_nlink(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 new_inode->i_ctime = ts;
992 }
993out:
994 brelse(sinfo.bh);
995 brelse(dotdot_bh);
996 brelse(old_sinfo.bh);
Marco Stornellie40b34c2012-10-06 12:40:03 +0200997 mutex_unlock(&MSDOS_SB(sb)->s_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999 return err;
1000
1001error_dotdot:
1002 /* data cluster is shared, serious corruption */
1003 corrupt = 1;
1004
1005 if (update_dotdot) {
Steven J. Magnania943ed72012-07-30 14:42:13 -07001006 fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
Al Virob5224122009-06-07 13:44:36 -04001007 mark_buffer_dirty_inode(dotdot_bh, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 corrupt |= sync_dirty_buffer(dotdot_bh);
1009 }
1010error_inode:
1011 fat_detach(old_inode);
1012 fat_attach(old_inode, old_sinfo.i_pos);
1013 if (new_inode) {
OGAWA Hirofumi9131dd42005-10-30 15:03:50 -08001014 fat_attach(new_inode, new_i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 if (corrupt)
1016 corrupt |= fat_sync_inode(new_inode);
1017 } else {
1018 /*
1019 * If new entry was not sharing the data cluster, it
1020 * shouldn't be serious corruption.
1021 */
1022 int err2 = fat_remove_entries(new_dir, &sinfo);
1023 if (corrupt)
1024 corrupt |= err2;
1025 sinfo.bh = NULL;
1026 }
1027 if (corrupt < 0) {
Denis Karpov85c78592009-06-04 02:34:22 +09001028 fat_fs_error(new_dir->i_sb,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 "%s: Filesystem corrupted (i_pos %lld)",
Harvey Harrison8e24eea2008-04-30 00:55:09 -07001030 __func__, sinfo.i_pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
1032 goto out;
1033}
1034
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001035static const struct inode_operations vfat_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 .create = vfat_create,
1037 .lookup = vfat_lookup,
1038 .unlink = vfat_unlink,
1039 .mkdir = vfat_mkdir,
1040 .rmdir = vfat_rmdir,
1041 .rename = vfat_rename,
OGAWA Hirofumi1278fdd2008-04-28 02:16:25 -07001042 .setattr = fat_setattr,
OGAWA Hirofumida63fc72006-11-16 01:19:28 -08001043 .getattr = fat_getattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044};
1045
Al Viro3d239852010-12-18 10:44:00 -05001046static void setup(struct super_block *sb)
1047{
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +09001048 MSDOS_SB(sb)->dir_ops = &vfat_dir_inode_operations;
Al Viro3d239852010-12-18 10:44:00 -05001049 if (MSDOS_SB(sb)->options.name_check != 's')
1050 sb->s_d_op = &vfat_ci_dentry_ops;
1051 else
1052 sb->s_d_op = &vfat_dentry_ops;
1053}
1054
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055static int vfat_fill_super(struct super_block *sb, void *data, int silent)
1056{
OGAWA Hirofumi384f5c92011-04-12 21:08:37 +09001057 return fat_fill_super(sb, data, silent, 1, setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
1059
Al Viro152a0832010-07-25 00:46:55 +04001060static struct dentry *vfat_mount(struct file_system_type *fs_type,
David Howells454e2392006-06-23 02:02:57 -07001061 int flags, const char *dev_name,
Al Viro152a0832010-07-25 00:46:55 +04001062 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063{
Al Viro152a0832010-07-25 00:46:55 +04001064 return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065}
1066
1067static struct file_system_type vfat_fs_type = {
1068 .owner = THIS_MODULE,
1069 .name = "vfat",
Al Viro152a0832010-07-25 00:46:55 +04001070 .mount = vfat_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 .kill_sb = kill_block_super,
1072 .fs_flags = FS_REQUIRES_DEV,
1073};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001074MODULE_ALIAS_FS("vfat");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
1076static int __init init_vfat_fs(void)
1077{
1078 return register_filesystem(&vfat_fs_type);
1079}
1080
1081static void __exit exit_vfat_fs(void)
1082{
1083 unregister_filesystem(&vfat_fs_type);
1084}
1085
1086MODULE_LICENSE("GPL");
1087MODULE_DESCRIPTION("VFAT filesystem support");
1088MODULE_AUTHOR("Gordon Chaffee");
1089
1090module_init(init_vfat_fs)
1091module_exit(exit_vfat_fs)