]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/fat/dir.c | |
3 | * | |
4 | * directory handling functions for fat-based filesystems | |
5 | * | |
6 | * Written 1992,1993 by Werner Almesberger | |
7 | * | |
8 | * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu> | |
9 | * | |
10 | * VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu> | |
11 | * Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk> | |
12 | * Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV | |
13 | * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de> | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/time.h> | |
1da177e4 LT |
19 | #include <linux/smp_lock.h> |
20 | #include <linux/buffer_head.h> | |
188f83df | 21 | #include <linux/compat.h> |
1da177e4 | 22 | #include <asm/uaccess.h> |
9e975dae | 23 | #include "fat.h" |
1da177e4 LT |
24 | |
25 | static inline loff_t fat_make_i_pos(struct super_block *sb, | |
26 | struct buffer_head *bh, | |
27 | struct msdos_dir_entry *de) | |
28 | { | |
29 | return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) | |
30 | | (de - (struct msdos_dir_entry *)bh->b_data); | |
31 | } | |
32 | ||
f3ef6f63 KW |
33 | static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, |
34 | sector_t phys) | |
35 | { | |
36 | struct super_block *sb = dir->i_sb; | |
37 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
38 | struct buffer_head *bh; | |
39 | int sec; | |
40 | ||
41 | /* This is not a first sector of cluster, or sec_per_clus == 1 */ | |
42 | if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) | |
43 | return; | |
44 | /* root dir of FAT12/FAT16 */ | |
45 | if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) | |
46 | return; | |
47 | ||
83b7c996 OH |
48 | bh = sb_find_get_block(sb, phys); |
49 | if (bh == NULL || !buffer_uptodate(bh)) { | |
f3ef6f63 KW |
50 | for (sec = 0; sec < sbi->sec_per_clus; sec++) |
51 | sb_breadahead(sb, phys + sec); | |
52 | } | |
53 | brelse(bh); | |
54 | } | |
55 | ||
1da177e4 LT |
56 | /* Returns the inode number of the directory entry at offset pos. If bh is |
57 | non-NULL, it is brelse'd before. Pos is incremented. The buffer header is | |
58 | returned in bh. | |
59 | AV. Most often we do it item-by-item. Makes sense to optimize. | |
60 | AV. OK, there we go: if both bh and de are non-NULL we assume that we just | |
61 | AV. want the next entry (took one explicit de=NULL in vfat/namei.c). | |
62 | AV. It's done in fat_get_entry() (inlined), here the slow case lives. | |
63 | AV. Additionally, when we return -1 (i.e. reached the end of directory) | |
64 | AV. we make bh NULL. | |
65 | */ | |
66 | static int fat__get_entry(struct inode *dir, loff_t *pos, | |
67 | struct buffer_head **bh, struct msdos_dir_entry **de) | |
68 | { | |
69 | struct super_block *sb = dir->i_sb; | |
70 | sector_t phys, iblock; | |
e5174baa OH |
71 | unsigned long mapped_blocks; |
72 | int err, offset; | |
1da177e4 LT |
73 | |
74 | next: | |
75 | if (*bh) | |
76 | brelse(*bh); | |
77 | ||
78 | *bh = NULL; | |
79 | iblock = *pos >> sb->s_blocksize_bits; | |
2bdf67eb | 80 | err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0); |
1da177e4 LT |
81 | if (err || !phys) |
82 | return -1; /* beyond EOF or error */ | |
83 | ||
f3ef6f63 KW |
84 | fat_dir_readahead(dir, iblock, phys); |
85 | ||
1da177e4 LT |
86 | *bh = sb_bread(sb, phys); |
87 | if (*bh == NULL) { | |
88 | printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n", | |
c3302931 | 89 | (llu)phys); |
1da177e4 LT |
90 | /* skip this block */ |
91 | *pos = (iblock + 1) << sb->s_blocksize_bits; | |
92 | goto next; | |
93 | } | |
94 | ||
95 | offset = *pos & (sb->s_blocksize - 1); | |
96 | *pos += sizeof(struct msdos_dir_entry); | |
97 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static inline int fat_get_entry(struct inode *dir, loff_t *pos, | |
103 | struct buffer_head **bh, | |
104 | struct msdos_dir_entry **de) | |
105 | { | |
106 | /* Fast stuff first */ | |
107 | if (*bh && *de && | |
108 | (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) { | |
109 | *pos += sizeof(struct msdos_dir_entry); | |
110 | (*de)++; | |
111 | return 0; | |
112 | } | |
113 | return fat__get_entry(dir, pos, bh, de); | |
114 | } | |
115 | ||
116 | /* | |
4de151d8 | 117 | * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. |
1da177e4 LT |
118 | * If uni_xlate is enabled and we can't get a 1:1 conversion, use a |
119 | * colon as an escape character since it is normally invalid on the vfat | |
120 | * filesystem. The following four characters are the hexadecimal digits | |
121 | * of Unicode value. This lets us do a full dump and restore of Unicode | |
122 | * filenames. We could get into some trouble with long Unicode names, | |
123 | * but ignore that right now. | |
124 | * Ahem... Stack smashing in ring 0 isn't fun. Fixed. | |
125 | */ | |
d6886116 | 126 | static int uni16_to_x8(unsigned char *ascii, const wchar_t *uni, int len, |
f22032ba | 127 | int uni_xlate, struct nls_table *nls) |
1da177e4 | 128 | { |
d6886116 OH |
129 | const wchar_t *ip; |
130 | wchar_t ec; | |
1da177e4 LT |
131 | unsigned char *op, nc; |
132 | int charlen; | |
133 | int k; | |
134 | ||
135 | ip = uni; | |
136 | op = ascii; | |
137 | ||
f22032ba | 138 | while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { |
1da177e4 LT |
139 | ec = *ip++; |
140 | if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) { | |
141 | op += charlen; | |
f22032ba | 142 | len -= charlen; |
1da177e4 LT |
143 | } else { |
144 | if (uni_xlate == 1) { | |
145 | *op = ':'; | |
146 | for (k = 4; k > 0; k--) { | |
147 | nc = ec & 0xF; | |
148 | op[k] = nc > 9 ? nc + ('a' - 10) | |
149 | : nc + '0'; | |
150 | ec >>= 4; | |
151 | } | |
152 | op += 5; | |
f22032ba | 153 | len -= 5; |
1da177e4 LT |
154 | } else { |
155 | *op++ = '?'; | |
f22032ba | 156 | len--; |
1da177e4 LT |
157 | } |
158 | } | |
1da177e4 | 159 | } |
f22032ba KM |
160 | |
161 | if (unlikely(*ip)) { | |
162 | printk(KERN_WARNING "FAT: filename was truncated while " | |
163 | "converting."); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | *op = 0; |
167 | return (op - ascii); | |
168 | } | |
169 | ||
d6886116 OH |
170 | static inline int fat_uni_to_x8(struct msdos_sb_info *sbi, const wchar_t *uni, |
171 | unsigned char *buf, int size) | |
172 | { | |
173 | if (sbi->options.utf8) | |
174 | return utf8_wcstombs(buf, uni, size); | |
175 | else | |
176 | return uni16_to_x8(buf, uni, size, sbi->options.unicode_xlate, | |
177 | sbi->nls_io); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | static inline int |
181 | fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) | |
182 | { | |
183 | int charlen; | |
184 | ||
185 | charlen = t->char2uni(c, clen, uni); | |
186 | if (charlen < 0) { | |
187 | *uni = 0x003f; /* a question mark */ | |
188 | charlen = 1; | |
189 | } | |
190 | return charlen; | |
191 | } | |
192 | ||
193 | static inline int | |
194 | fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) | |
195 | { | |
196 | int charlen; | |
197 | wchar_t wc; | |
198 | ||
199 | charlen = t->char2uni(c, clen, &wc); | |
200 | if (charlen < 0) { | |
201 | *uni = 0x003f; /* a question mark */ | |
202 | charlen = 1; | |
203 | } else if (charlen <= 1) { | |
204 | unsigned char nc = t->charset2lower[*c]; | |
205 | ||
206 | if (!nc) | |
207 | nc = *c; | |
208 | ||
209 | if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) { | |
210 | *uni = 0x003f; /* a question mark */ | |
211 | charlen = 1; | |
212 | } | |
213 | } else | |
214 | *uni = wc; | |
215 | ||
216 | return charlen; | |
217 | } | |
218 | ||
219 | static inline int | |
220 | fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, | |
221 | wchar_t *uni_buf, unsigned short opt, int lower) | |
222 | { | |
223 | int len = 0; | |
224 | ||
225 | if (opt & VFAT_SFN_DISPLAY_LOWER) | |
226 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
227 | else if (opt & VFAT_SFN_DISPLAY_WIN95) | |
228 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
229 | else if (opt & VFAT_SFN_DISPLAY_WINNT) { | |
230 | if (lower) | |
231 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
232 | else | |
233 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
234 | } else | |
235 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
236 | ||
237 | return len; | |
238 | } | |
239 | ||
d6886116 OH |
240 | static inline int fat_name_match(struct msdos_sb_info *sbi, |
241 | const unsigned char *a, int a_len, | |
242 | const unsigned char *b, int b_len) | |
243 | { | |
244 | if (a_len != b_len) | |
245 | return 0; | |
246 | ||
247 | if (sbi->options.name_check != 's') | |
248 | return !nls_strnicmp(sbi->nls_io, a, b, a_len); | |
249 | else | |
250 | return !memcmp(a, b, a_len); | |
251 | } | |
252 | ||
ad2c1604 PE |
253 | enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; |
254 | ||
255 | /** | |
256 | * fat_parse_long - Parse extended directory entry. | |
257 | * | |
258 | * This function returns zero on success, negative value on error, or one of | |
259 | * the following: | |
260 | * | |
261 | * %PARSE_INVALID - Directory entry is invalid. | |
262 | * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. | |
263 | * %PARSE_EOF - Directory has no more entries. | |
264 | */ | |
265 | static int fat_parse_long(struct inode *dir, loff_t *pos, | |
266 | struct buffer_head **bh, struct msdos_dir_entry **de, | |
267 | wchar_t **unicode, unsigned char *nr_slots) | |
268 | { | |
269 | struct msdos_dir_slot *ds; | |
270 | unsigned char id, slot, slots, alias_checksum; | |
271 | ||
272 | if (!*unicode) { | |
c7a6c4ed | 273 | *unicode = __getname(); |
ad2c1604 PE |
274 | if (!*unicode) { |
275 | brelse(*bh); | |
276 | return -ENOMEM; | |
277 | } | |
278 | } | |
279 | parse_long: | |
280 | slots = 0; | |
281 | ds = (struct msdos_dir_slot *)*de; | |
282 | id = ds->id; | |
283 | if (!(id & 0x40)) | |
284 | return PARSE_INVALID; | |
285 | slots = id & ~0x40; | |
286 | if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ | |
287 | return PARSE_INVALID; | |
288 | *nr_slots = slots; | |
289 | alias_checksum = ds->alias_checksum; | |
290 | ||
291 | slot = slots; | |
292 | while (1) { | |
293 | int offset; | |
294 | ||
295 | slot--; | |
296 | offset = slot * 13; | |
297 | fat16_towchar(*unicode + offset, ds->name0_4, 5); | |
298 | fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); | |
299 | fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); | |
300 | ||
301 | if (ds->id & 0x40) | |
302 | (*unicode)[offset + 13] = 0; | |
303 | if (fat_get_entry(dir, pos, bh, de) < 0) | |
304 | return PARSE_EOF; | |
305 | if (slot == 0) | |
306 | break; | |
307 | ds = (struct msdos_dir_slot *)*de; | |
308 | if (ds->attr != ATTR_EXT) | |
309 | return PARSE_NOT_LONGNAME; | |
310 | if ((ds->id & ~0x40) != slot) | |
311 | goto parse_long; | |
312 | if (ds->alias_checksum != alias_checksum) | |
313 | goto parse_long; | |
314 | } | |
315 | if ((*de)->name[0] == DELETED_FLAG) | |
316 | return PARSE_INVALID; | |
317 | if ((*de)->attr == ATTR_EXT) | |
318 | goto parse_long; | |
319 | if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) | |
320 | return PARSE_INVALID; | |
321 | if (fat_checksum((*de)->name) != alias_checksum) | |
322 | *nr_slots = 0; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
98a15160 OH |
327 | /* |
328 | * Maximum buffer size of short name. | |
329 | * [(MSDOS_NAME + '.') * max one char + nul] | |
330 | * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] | |
331 | */ | |
332 | #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) | |
333 | /* | |
334 | * Maximum buffer size of unicode chars from slots. | |
335 | * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] | |
336 | */ | |
337 | #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) | |
338 | #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) | |
339 | ||
1da177e4 LT |
340 | /* |
341 | * Return values: negative -> error, 0 -> not found, positive -> found, | |
342 | * value is the total amount of slots, including the shortname entry. | |
343 | */ | |
344 | int fat_search_long(struct inode *inode, const unsigned char *name, | |
345 | int name_len, struct fat_slot_info *sinfo) | |
346 | { | |
347 | struct super_block *sb = inode->i_sb; | |
348 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
349 | struct buffer_head *bh = NULL; | |
350 | struct msdos_dir_entry *de; | |
1da177e4 | 351 | struct nls_table *nls_disk = sbi->nls_disk; |
f22032ba | 352 | unsigned char nr_slots; |
d6886116 | 353 | wchar_t bufuname[14]; |
1da177e4 | 354 | wchar_t *unicode = NULL; |
f22032ba | 355 | unsigned char work[MSDOS_NAME]; |
98a15160 | 356 | unsigned char bufname[FAT_MAX_SHORT_SIZE]; |
1da177e4 LT |
357 | unsigned short opt_shortname = sbi->options.shortname; |
358 | loff_t cpos = 0; | |
d6886116 | 359 | int chl, i, j, last_u, err, len; |
1da177e4 LT |
360 | |
361 | err = -ENOENT; | |
d6886116 | 362 | while (1) { |
1da177e4 | 363 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
d6886116 | 364 | goto end_of_dir; |
1da177e4 LT |
365 | parse_record: |
366 | nr_slots = 0; | |
367 | if (de->name[0] == DELETED_FLAG) | |
368 | continue; | |
369 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) | |
370 | continue; | |
371 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) | |
372 | continue; | |
373 | if (de->attr == ATTR_EXT) { | |
ad2c1604 PE |
374 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
375 | &unicode, &nr_slots); | |
52e9d9f4 DJ |
376 | if (status < 0) { |
377 | err = status; | |
378 | goto end_of_dir; | |
379 | } else if (status == PARSE_INVALID) | |
1da177e4 | 380 | continue; |
ad2c1604 PE |
381 | else if (status == PARSE_NOT_LONGNAME) |
382 | goto parse_record; | |
383 | else if (status == PARSE_EOF) | |
d6886116 | 384 | goto end_of_dir; |
1da177e4 LT |
385 | } |
386 | ||
387 | memcpy(work, de->name, sizeof(de->name)); | |
388 | /* see namei.c, msdos_format_name */ | |
389 | if (work[0] == 0x05) | |
390 | work[0] = 0xE5; | |
391 | for (i = 0, j = 0, last_u = 0; i < 8;) { | |
9aacd599 OH |
392 | if (!work[i]) |
393 | break; | |
1da177e4 LT |
394 | chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, |
395 | &bufuname[j++], opt_shortname, | |
396 | de->lcase & CASE_LOWER_BASE); | |
397 | if (chl <= 1) { | |
398 | if (work[i] != ' ') | |
399 | last_u = j; | |
400 | } else { | |
401 | last_u = j; | |
402 | } | |
403 | i += chl; | |
404 | } | |
405 | j = last_u; | |
406 | fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); | |
9aacd599 OH |
407 | for (i = 8; i < MSDOS_NAME;) { |
408 | if (!work[i]) | |
409 | break; | |
410 | chl = fat_shortname2uni(nls_disk, &work[i], | |
411 | MSDOS_NAME - i, | |
1da177e4 LT |
412 | &bufuname[j++], opt_shortname, |
413 | de->lcase & CASE_LOWER_EXT); | |
414 | if (chl <= 1) { | |
9aacd599 | 415 | if (work[i] != ' ') |
1da177e4 LT |
416 | last_u = j; |
417 | } else { | |
418 | last_u = j; | |
419 | } | |
420 | i += chl; | |
421 | } | |
422 | if (!last_u) | |
423 | continue; | |
424 | ||
d6886116 | 425 | /* Compare shortname */ |
1da177e4 | 426 | bufuname[last_u] = 0x0000; |
98a15160 | 427 | len = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); |
d6886116 OH |
428 | if (fat_name_match(sbi, name, name_len, bufname, len)) |
429 | goto found; | |
1da177e4 LT |
430 | |
431 | if (nr_slots) { | |
98a15160 OH |
432 | void *longname = unicode + FAT_MAX_UNI_CHARS; |
433 | int size = PATH_MAX - FAT_MAX_UNI_SIZE; | |
434 | ||
d6886116 | 435 | /* Compare longname */ |
98a15160 OH |
436 | len = fat_uni_to_x8(sbi, unicode, longname, size); |
437 | if (fat_name_match(sbi, name, name_len, longname, len)) | |
d6886116 | 438 | goto found; |
1da177e4 LT |
439 | } |
440 | } | |
441 | ||
d6886116 | 442 | found: |
1da177e4 LT |
443 | nr_slots++; /* include the de */ |
444 | sinfo->slot_off = cpos - nr_slots * sizeof(*de); | |
445 | sinfo->nr_slots = nr_slots; | |
446 | sinfo->de = de; | |
447 | sinfo->bh = bh; | |
448 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
449 | err = 0; | |
d6886116 | 450 | end_of_dir: |
1da177e4 | 451 | if (unicode) |
c7a6c4ed | 452 | __putname(unicode); |
1da177e4 LT |
453 | |
454 | return err; | |
455 | } | |
456 | ||
7c709d00 | 457 | EXPORT_SYMBOL_GPL(fat_search_long); |
1da177e4 LT |
458 | |
459 | struct fat_ioctl_filldir_callback { | |
c483bab0 | 460 | void __user *dirent; |
1da177e4 LT |
461 | int result; |
462 | /* for dir ioctl */ | |
463 | const char *longname; | |
464 | int long_len; | |
465 | const char *shortname; | |
466 | int short_len; | |
467 | }; | |
468 | ||
ad2c1604 PE |
469 | static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, |
470 | filldir_t filldir, int short_only, int both) | |
1da177e4 LT |
471 | { |
472 | struct super_block *sb = inode->i_sb; | |
473 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
474 | struct buffer_head *bh; | |
475 | struct msdos_dir_entry *de; | |
1da177e4 | 476 | struct nls_table *nls_disk = sbi->nls_disk; |
d6886116 | 477 | unsigned char nr_slots; |
1da177e4 LT |
478 | wchar_t bufuname[14]; |
479 | wchar_t *unicode = NULL; | |
98a15160 OH |
480 | unsigned char c, work[MSDOS_NAME]; |
481 | unsigned char bufname[FAT_MAX_SHORT_SIZE], *ptname = bufname; | |
d6886116 | 482 | unsigned short opt_shortname = sbi->options.shortname; |
1da177e4 | 483 | int isvfat = sbi->options.isvfat; |
1da177e4 | 484 | int nocase = sbi->options.nocase; |
dcd8c53f | 485 | const char *fill_name = NULL; |
1da177e4 | 486 | unsigned long inum; |
d6886116 | 487 | unsigned long lpos, dummy, *furrfu = &lpos; |
1da177e4 | 488 | loff_t cpos; |
dcd8c53f | 489 | int chi, chl, i, i2, j, last, last_u, dotoffset = 0, fill_len = 0; |
1da177e4 LT |
490 | int ret = 0; |
491 | ||
8f593427 | 492 | lock_super(sb); |
1da177e4 LT |
493 | |
494 | cpos = filp->f_pos; | |
495 | /* Fake . and .. for the root directory. */ | |
496 | if (inode->i_ino == MSDOS_ROOT_INO) { | |
497 | while (cpos < 2) { | |
498 | if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0) | |
499 | goto out; | |
500 | cpos++; | |
501 | filp->f_pos++; | |
502 | } | |
503 | if (cpos == 2) { | |
504 | dummy = 2; | |
505 | furrfu = &dummy; | |
506 | cpos = 0; | |
507 | } | |
508 | } | |
d6886116 | 509 | if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { |
1da177e4 LT |
510 | ret = -ENOENT; |
511 | goto out; | |
512 | } | |
513 | ||
514 | bh = NULL; | |
d6886116 | 515 | get_new: |
1da177e4 | 516 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
d6886116 | 517 | goto end_of_dir; |
ad2c1604 | 518 | parse_record: |
d6886116 | 519 | nr_slots = 0; |
dcd8c53f OH |
520 | /* |
521 | * Check for long filename entry, but if short_only, we don't | |
522 | * need to parse long filename. | |
523 | */ | |
524 | if (isvfat && !short_only) { | |
1da177e4 | 525 | if (de->name[0] == DELETED_FLAG) |
d6886116 | 526 | goto record_end; |
1da177e4 | 527 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) |
d6886116 | 528 | goto record_end; |
1da177e4 | 529 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) |
d6886116 | 530 | goto record_end; |
1da177e4 LT |
531 | } else { |
532 | if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) | |
d6886116 | 533 | goto record_end; |
1da177e4 LT |
534 | } |
535 | ||
536 | if (isvfat && de->attr == ATTR_EXT) { | |
ad2c1604 | 537 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
d6886116 | 538 | &unicode, &nr_slots); |
ad2c1604 PE |
539 | if (status < 0) { |
540 | filp->f_pos = cpos; | |
541 | ret = status; | |
542 | goto out; | |
543 | } else if (status == PARSE_INVALID) | |
d6886116 | 544 | goto record_end; |
ad2c1604 PE |
545 | else if (status == PARSE_NOT_LONGNAME) |
546 | goto parse_record; | |
547 | else if (status == PARSE_EOF) | |
d6886116 | 548 | goto end_of_dir; |
dcd8c53f OH |
549 | |
550 | if (nr_slots) { | |
551 | void *longname = unicode + FAT_MAX_UNI_CHARS; | |
552 | int size = PATH_MAX - FAT_MAX_UNI_SIZE; | |
553 | int len = fat_uni_to_x8(sbi, unicode, longname, size); | |
554 | ||
555 | fill_name = longname; | |
556 | fill_len = len; | |
557 | /* !both && !short_only, so we don't need shortname. */ | |
558 | if (!both) | |
559 | goto start_filldir; | |
560 | } | |
1da177e4 LT |
561 | } |
562 | ||
563 | if (sbi->options.dotsOK) { | |
564 | ptname = bufname; | |
565 | dotoffset = 0; | |
566 | if (de->attr & ATTR_HIDDEN) { | |
567 | *ptname++ = '.'; | |
568 | dotoffset = 1; | |
569 | } | |
570 | } | |
571 | ||
572 | memcpy(work, de->name, sizeof(de->name)); | |
573 | /* see namei.c, msdos_format_name */ | |
574 | if (work[0] == 0x05) | |
575 | work[0] = 0xE5; | |
576 | for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) { | |
9aacd599 OH |
577 | if (!(c = work[i])) |
578 | break; | |
1da177e4 LT |
579 | chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, |
580 | &bufuname[j++], opt_shortname, | |
581 | de->lcase & CASE_LOWER_BASE); | |
582 | if (chl <= 1) { | |
583 | ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; | |
584 | if (c != ' ') { | |
585 | last = i; | |
586 | last_u = j; | |
587 | } | |
588 | } else { | |
589 | last_u = j; | |
590 | for (chi = 0; chi < chl && i < 8; chi++) { | |
591 | ptname[i] = work[i]; | |
592 | i++; last = i; | |
593 | } | |
594 | } | |
595 | } | |
596 | i = last; | |
597 | j = last_u; | |
598 | fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); | |
599 | ptname[i++] = '.'; | |
9aacd599 OH |
600 | for (i2 = 8; i2 < MSDOS_NAME;) { |
601 | if (!(c = work[i2])) | |
602 | break; | |
603 | chl = fat_shortname2uni(nls_disk, &work[i2], MSDOS_NAME - i2, | |
1da177e4 LT |
604 | &bufuname[j++], opt_shortname, |
605 | de->lcase & CASE_LOWER_EXT); | |
606 | if (chl <= 1) { | |
607 | i2++; | |
608 | ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; | |
609 | if (c != ' ') { | |
610 | last = i; | |
611 | last_u = j; | |
612 | } | |
613 | } else { | |
614 | last_u = j; | |
9aacd599 OH |
615 | for (chi = 0; chi < chl && i2 < MSDOS_NAME; chi++) { |
616 | ptname[i++] = work[i2++]; | |
1da177e4 LT |
617 | last = i; |
618 | } | |
619 | } | |
620 | } | |
621 | if (!last) | |
d6886116 | 622 | goto record_end; |
1da177e4 LT |
623 | |
624 | i = last + dotoffset; | |
625 | j = last_u; | |
626 | ||
dcd8c53f OH |
627 | if (isvfat) { |
628 | bufuname[j] = 0x0000; | |
629 | i = fat_uni_to_x8(sbi, bufuname, bufname, sizeof(bufname)); | |
630 | } | |
631 | if (nr_slots) { | |
632 | /* hack for fat_ioctl_filldir() */ | |
633 | struct fat_ioctl_filldir_callback *p = dirent; | |
634 | ||
635 | p->longname = fill_name; | |
636 | p->long_len = fill_len; | |
637 | p->shortname = bufname; | |
638 | p->short_len = i; | |
639 | fill_name = NULL; | |
640 | fill_len = 0; | |
641 | } else { | |
642 | fill_name = bufname; | |
643 | fill_len = i; | |
644 | } | |
645 | ||
646 | start_filldir: | |
d6886116 | 647 | lpos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); |
1da177e4 LT |
648 | if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) |
649 | inum = inode->i_ino; | |
650 | else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
dba32306 | 651 | inum = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
652 | } else { |
653 | loff_t i_pos = fat_make_i_pos(sb, bh, de); | |
654 | struct inode *tmp = fat_iget(sb, i_pos); | |
655 | if (tmp) { | |
656 | inum = tmp->i_ino; | |
657 | iput(tmp); | |
658 | } else | |
659 | inum = iunique(sb, MSDOS_ROOT_INO); | |
660 | } | |
661 | ||
1da177e4 LT |
662 | if (filldir(dirent, fill_name, fill_len, *furrfu, inum, |
663 | (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0) | |
d6886116 | 664 | goto fill_failed; |
1da177e4 | 665 | |
d6886116 | 666 | record_end: |
1da177e4 LT |
667 | furrfu = &lpos; |
668 | filp->f_pos = cpos; | |
d6886116 OH |
669 | goto get_new; |
670 | end_of_dir: | |
1da177e4 | 671 | filp->f_pos = cpos; |
d6886116 | 672 | fill_failed: |
f3ef6f63 | 673 | brelse(bh); |
1da177e4 | 674 | if (unicode) |
c7a6c4ed | 675 | __putname(unicode); |
1da177e4 | 676 | out: |
8f593427 | 677 | unlock_super(sb); |
1da177e4 LT |
678 | return ret; |
679 | } | |
680 | ||
681 | static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
682 | { | |
dba32306 | 683 | struct inode *inode = filp->f_path.dentry->d_inode; |
ad2c1604 | 684 | return __fat_readdir(inode, filp, dirent, filldir, 0, 0); |
1da177e4 LT |
685 | } |
686 | ||
c483bab0 OH |
687 | #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ |
688 | static int func(void *__buf, const char *name, int name_len, \ | |
689 | loff_t offset, u64 ino, unsigned int d_type) \ | |
690 | { \ | |
691 | struct fat_ioctl_filldir_callback *buf = __buf; \ | |
692 | struct dirent_type __user *d1 = buf->dirent; \ | |
693 | struct dirent_type __user *d2 = d1 + 1; \ | |
694 | \ | |
695 | if (buf->result) \ | |
696 | return -EINVAL; \ | |
697 | buf->result++; \ | |
698 | \ | |
699 | if (name != NULL) { \ | |
700 | /* dirent has only short name */ \ | |
701 | if (name_len >= sizeof(d1->d_name)) \ | |
702 | name_len = sizeof(d1->d_name) - 1; \ | |
703 | \ | |
704 | if (put_user(0, d2->d_name) || \ | |
705 | put_user(0, &d2->d_reclen) || \ | |
706 | copy_to_user(d1->d_name, name, name_len) || \ | |
707 | put_user(0, d1->d_name + name_len) || \ | |
708 | put_user(name_len, &d1->d_reclen)) \ | |
709 | goto efault; \ | |
710 | } else { \ | |
711 | /* dirent has short and long name */ \ | |
712 | const char *longname = buf->longname; \ | |
713 | int long_len = buf->long_len; \ | |
714 | const char *shortname = buf->shortname; \ | |
715 | int short_len = buf->short_len; \ | |
716 | \ | |
717 | if (long_len >= sizeof(d1->d_name)) \ | |
718 | long_len = sizeof(d1->d_name) - 1; \ | |
719 | if (short_len >= sizeof(d1->d_name)) \ | |
720 | short_len = sizeof(d1->d_name) - 1; \ | |
721 | \ | |
722 | if (copy_to_user(d2->d_name, longname, long_len) || \ | |
723 | put_user(0, d2->d_name + long_len) || \ | |
724 | put_user(long_len, &d2->d_reclen) || \ | |
725 | put_user(ino, &d2->d_ino) || \ | |
726 | put_user(offset, &d2->d_off) || \ | |
727 | copy_to_user(d1->d_name, shortname, short_len) || \ | |
728 | put_user(0, d1->d_name + short_len) || \ | |
729 | put_user(short_len, &d1->d_reclen)) \ | |
730 | goto efault; \ | |
731 | } \ | |
732 | return 0; \ | |
733 | efault: \ | |
734 | buf->result = -EFAULT; \ | |
735 | return -EFAULT; \ | |
736 | } | |
737 | ||
531f710f | 738 | FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) |
c483bab0 OH |
739 | |
740 | static int fat_ioctl_readdir(struct inode *inode, struct file *filp, | |
741 | void __user *dirent, filldir_t filldir, | |
742 | int short_only, int both) | |
1da177e4 | 743 | { |
c483bab0 OH |
744 | struct fat_ioctl_filldir_callback buf; |
745 | int ret; | |
746 | ||
747 | buf.dirent = dirent; | |
748 | buf.result = 0; | |
749 | mutex_lock(&inode->i_mutex); | |
750 | ret = -ENOENT; | |
751 | if (!IS_DEADDIR(inode)) { | |
752 | ret = __fat_readdir(inode, filp, &buf, filldir, | |
753 | short_only, both); | |
1da177e4 | 754 | } |
c483bab0 OH |
755 | mutex_unlock(&inode->i_mutex); |
756 | if (ret >= 0) | |
757 | ret = buf.result; | |
758 | return ret; | |
1da177e4 LT |
759 | } |
760 | ||
c483bab0 OH |
761 | static int fat_dir_ioctl(struct inode *inode, struct file *filp, |
762 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 763 | { |
531f710f | 764 | struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; |
c483bab0 | 765 | int short_only, both; |
1da177e4 LT |
766 | |
767 | switch (cmd) { | |
768 | case VFAT_IOCTL_READDIR_SHORT: | |
769 | short_only = 1; | |
770 | both = 0; | |
771 | break; | |
772 | case VFAT_IOCTL_READDIR_BOTH: | |
773 | short_only = 0; | |
774 | both = 1; | |
775 | break; | |
776 | default: | |
777 | return fat_generic_ioctl(inode, filp, cmd, arg); | |
778 | } | |
779 | ||
531f710f | 780 | if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2]))) |
1da177e4 LT |
781 | return -EFAULT; |
782 | /* | |
783 | * Yes, we don't need this put_user() absolutely. However old | |
784 | * code didn't return the right value. So, app use this value, | |
785 | * in order to check whether it is EOF. | |
786 | */ | |
787 | if (put_user(0, &d1->d_reclen)) | |
788 | return -EFAULT; | |
789 | ||
c483bab0 OH |
790 | return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, |
791 | short_only, both); | |
1da177e4 LT |
792 | } |
793 | ||
188f83df DH |
794 | #ifdef CONFIG_COMPAT |
795 | #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) | |
796 | #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) | |
797 | ||
c483bab0 | 798 | FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) |
188f83df | 799 | |
c483bab0 | 800 | static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, |
188f83df DH |
801 | unsigned long arg) |
802 | { | |
c483bab0 OH |
803 | struct inode *inode = filp->f_path.dentry->d_inode; |
804 | struct compat_dirent __user *d1 = compat_ptr(arg); | |
805 | int short_only, both; | |
188f83df DH |
806 | |
807 | switch (cmd) { | |
188f83df | 808 | case VFAT_IOCTL_READDIR_SHORT32: |
c483bab0 OH |
809 | short_only = 1; |
810 | both = 0; | |
811 | break; | |
812 | case VFAT_IOCTL_READDIR_BOTH32: | |
813 | short_only = 0; | |
814 | both = 1; | |
188f83df DH |
815 | break; |
816 | default: | |
817 | return -ENOIOCTLCMD; | |
818 | } | |
819 | ||
c483bab0 OH |
820 | if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) |
821 | return -EFAULT; | |
822 | /* | |
823 | * Yes, we don't need this put_user() absolutely. However old | |
824 | * code didn't return the right value. So, app use this value, | |
825 | * in order to check whether it is EOF. | |
826 | */ | |
827 | if (put_user(0, &d1->d_reclen)) | |
828 | return -EFAULT; | |
829 | ||
830 | return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, | |
831 | short_only, both); | |
188f83df DH |
832 | } |
833 | #endif /* CONFIG_COMPAT */ | |
834 | ||
4b6f5d20 | 835 | const struct file_operations fat_dir_operations = { |
53472bc8 | 836 | .llseek = generic_file_llseek, |
1da177e4 LT |
837 | .read = generic_read_dir, |
838 | .readdir = fat_readdir, | |
839 | .ioctl = fat_dir_ioctl, | |
188f83df DH |
840 | #ifdef CONFIG_COMPAT |
841 | .compat_ioctl = fat_compat_dir_ioctl, | |
842 | #endif | |
1da177e4 LT |
843 | .fsync = file_fsync, |
844 | }; | |
845 | ||
846 | static int fat_get_short_entry(struct inode *dir, loff_t *pos, | |
847 | struct buffer_head **bh, | |
848 | struct msdos_dir_entry **de) | |
849 | { | |
850 | while (fat_get_entry(dir, pos, bh, de) >= 0) { | |
851 | /* free entry or long name entry or volume label */ | |
852 | if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) | |
853 | return 0; | |
854 | } | |
855 | return -ENOENT; | |
856 | } | |
857 | ||
858 | /* | |
859 | * The ".." entry can not provide the "struct fat_slot_info" informations | |
860 | * for inode. So, this function provide the some informations only. | |
861 | */ | |
862 | int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, | |
863 | struct msdos_dir_entry **de, loff_t *i_pos) | |
864 | { | |
865 | loff_t offset; | |
866 | ||
867 | offset = 0; | |
868 | *bh = NULL; | |
869 | while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { | |
870 | if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
871 | *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de); | |
872 | return 0; | |
873 | } | |
874 | } | |
875 | return -ENOENT; | |
876 | } | |
877 | ||
7c709d00 | 878 | EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); |
1da177e4 LT |
879 | |
880 | /* See if directory is empty */ | |
881 | int fat_dir_empty(struct inode *dir) | |
882 | { | |
883 | struct buffer_head *bh; | |
884 | struct msdos_dir_entry *de; | |
885 | loff_t cpos; | |
886 | int result = 0; | |
887 | ||
888 | bh = NULL; | |
889 | cpos = 0; | |
890 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
891 | if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && | |
892 | strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
893 | result = -ENOTEMPTY; | |
894 | break; | |
895 | } | |
896 | } | |
897 | brelse(bh); | |
898 | return result; | |
899 | } | |
900 | ||
7c709d00 | 901 | EXPORT_SYMBOL_GPL(fat_dir_empty); |
1da177e4 LT |
902 | |
903 | /* | |
904 | * fat_subdirs counts the number of sub-directories of dir. It can be run | |
905 | * on directories being created. | |
906 | */ | |
907 | int fat_subdirs(struct inode *dir) | |
908 | { | |
909 | struct buffer_head *bh; | |
910 | struct msdos_dir_entry *de; | |
911 | loff_t cpos; | |
912 | int count = 0; | |
913 | ||
914 | bh = NULL; | |
915 | cpos = 0; | |
916 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
917 | if (de->attr & ATTR_DIR) | |
918 | count++; | |
919 | } | |
920 | brelse(bh); | |
921 | return count; | |
922 | } | |
923 | ||
924 | /* | |
925 | * Scans a directory for a given file (name points to its formatted name). | |
926 | * Returns an error code or zero. | |
927 | */ | |
928 | int fat_scan(struct inode *dir, const unsigned char *name, | |
929 | struct fat_slot_info *sinfo) | |
930 | { | |
931 | struct super_block *sb = dir->i_sb; | |
932 | ||
933 | sinfo->slot_off = 0; | |
934 | sinfo->bh = NULL; | |
935 | while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, | |
936 | &sinfo->de) >= 0) { | |
937 | if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { | |
938 | sinfo->slot_off -= sizeof(*sinfo->de); | |
939 | sinfo->nr_slots = 1; | |
940 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
941 | return 0; | |
942 | } | |
943 | } | |
944 | return -ENOENT; | |
945 | } | |
946 | ||
7c709d00 | 947 | EXPORT_SYMBOL_GPL(fat_scan); |
1da177e4 LT |
948 | |
949 | static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) | |
950 | { | |
951 | struct super_block *sb = dir->i_sb; | |
952 | struct buffer_head *bh; | |
953 | struct msdos_dir_entry *de, *endp; | |
954 | int err = 0, orig_slots; | |
955 | ||
956 | while (nr_slots) { | |
957 | bh = NULL; | |
958 | if (fat_get_entry(dir, &pos, &bh, &de) < 0) { | |
959 | err = -EIO; | |
960 | break; | |
961 | } | |
962 | ||
963 | orig_slots = nr_slots; | |
964 | endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); | |
965 | while (nr_slots && de < endp) { | |
966 | de->name[0] = DELETED_FLAG; | |
967 | de++; | |
968 | nr_slots--; | |
969 | } | |
970 | mark_buffer_dirty(bh); | |
971 | if (IS_DIRSYNC(dir)) | |
972 | err = sync_dirty_buffer(bh); | |
973 | brelse(bh); | |
974 | if (err) | |
975 | break; | |
976 | ||
977 | /* pos is *next* de's position, so this does `- sizeof(de)' */ | |
978 | pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); | |
979 | } | |
980 | ||
981 | return err; | |
982 | } | |
983 | ||
984 | int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) | |
985 | { | |
986 | struct msdos_dir_entry *de; | |
987 | struct buffer_head *bh; | |
988 | int err = 0, nr_slots; | |
989 | ||
990 | /* | |
991 | * First stage: Remove the shortname. By this, the directory | |
992 | * entry is removed. | |
993 | */ | |
994 | nr_slots = sinfo->nr_slots; | |
995 | de = sinfo->de; | |
996 | sinfo->de = NULL; | |
997 | bh = sinfo->bh; | |
998 | sinfo->bh = NULL; | |
999 | while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { | |
1000 | de->name[0] = DELETED_FLAG; | |
1001 | de--; | |
1002 | nr_slots--; | |
1003 | } | |
1004 | mark_buffer_dirty(bh); | |
1005 | if (IS_DIRSYNC(dir)) | |
1006 | err = sync_dirty_buffer(bh); | |
1007 | brelse(bh); | |
1008 | if (err) | |
1009 | return err; | |
1010 | dir->i_version++; | |
1011 | ||
1012 | if (nr_slots) { | |
1013 | /* | |
1014 | * Second stage: remove the remaining longname slots. | |
1015 | * (This directory entry is already removed, and so return | |
1016 | * the success) | |
1017 | */ | |
1018 | err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); | |
1019 | if (err) { | |
1020 | printk(KERN_WARNING | |
1021 | "FAT: Couldn't remove the long name slots\n"); | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; | |
1026 | if (IS_DIRSYNC(dir)) | |
1027 | (void)fat_sync_inode(dir); | |
1028 | else | |
1029 | mark_inode_dirty(dir); | |
1030 | ||
1031 | return 0; | |
1032 | } | |
1033 | ||
7c709d00 | 1034 | EXPORT_SYMBOL_GPL(fat_remove_entries); |
1da177e4 LT |
1035 | |
1036 | static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, | |
1037 | struct buffer_head **bhs, int nr_bhs) | |
1038 | { | |
1039 | struct super_block *sb = dir->i_sb; | |
1040 | sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; | |
1041 | int err, i, n; | |
1042 | ||
1043 | /* Zeroing the unused blocks on this cluster */ | |
1044 | blknr += nr_used; | |
1045 | n = nr_used; | |
1046 | while (blknr < last_blknr) { | |
1047 | bhs[n] = sb_getblk(sb, blknr); | |
1048 | if (!bhs[n]) { | |
1049 | err = -ENOMEM; | |
1050 | goto error; | |
1051 | } | |
1052 | memset(bhs[n]->b_data, 0, sb->s_blocksize); | |
1053 | set_buffer_uptodate(bhs[n]); | |
1054 | mark_buffer_dirty(bhs[n]); | |
1055 | ||
1056 | n++; | |
1057 | blknr++; | |
1058 | if (n == nr_bhs) { | |
1059 | if (IS_DIRSYNC(dir)) { | |
1060 | err = fat_sync_bhs(bhs, n); | |
1061 | if (err) | |
1062 | goto error; | |
1063 | } | |
1064 | for (i = 0; i < n; i++) | |
1065 | brelse(bhs[i]); | |
1066 | n = 0; | |
1067 | } | |
1068 | } | |
1069 | if (IS_DIRSYNC(dir)) { | |
1070 | err = fat_sync_bhs(bhs, n); | |
1071 | if (err) | |
1072 | goto error; | |
1073 | } | |
1074 | for (i = 0; i < n; i++) | |
1075 | brelse(bhs[i]); | |
1076 | ||
1077 | return 0; | |
1078 | ||
1079 | error: | |
1080 | for (i = 0; i < n; i++) | |
1081 | bforget(bhs[i]); | |
1082 | return err; | |
1083 | } | |
1084 | ||
1085 | int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) | |
1086 | { | |
1087 | struct super_block *sb = dir->i_sb; | |
1088 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1089 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1090 | struct msdos_dir_entry *de; | |
1091 | sector_t blknr; | |
1092 | __le16 date, time; | |
7decd1cb | 1093 | u8 time_cs; |
1da177e4 LT |
1094 | int err, cluster; |
1095 | ||
1096 | err = fat_alloc_clusters(dir, &cluster, 1); | |
1097 | if (err) | |
1098 | goto error; | |
1099 | ||
1100 | blknr = fat_clus_to_blknr(sbi, cluster); | |
1101 | bhs[0] = sb_getblk(sb, blknr); | |
1102 | if (!bhs[0]) { | |
1103 | err = -ENOMEM; | |
1104 | goto error_free; | |
1105 | } | |
1106 | ||
7decd1cb | 1107 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
1da177e4 LT |
1108 | |
1109 | de = (struct msdos_dir_entry *)bhs[0]->b_data; | |
1110 | /* filling the new directory slots ("." and ".." entries) */ | |
1111 | memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); | |
1112 | memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); | |
1113 | de->attr = de[1].attr = ATTR_DIR; | |
1114 | de[0].lcase = de[1].lcase = 0; | |
1115 | de[0].time = de[1].time = time; | |
1116 | de[0].date = de[1].date = date; | |
1da177e4 LT |
1117 | if (sbi->options.isvfat) { |
1118 | /* extra timestamps */ | |
1119 | de[0].ctime = de[1].ctime = time; | |
7decd1cb | 1120 | de[0].ctime_cs = de[1].ctime_cs = time_cs; |
1da177e4 LT |
1121 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; |
1122 | } else { | |
1123 | de[0].ctime = de[1].ctime = 0; | |
7decd1cb | 1124 | de[0].ctime_cs = de[1].ctime_cs = 0; |
1da177e4 LT |
1125 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; |
1126 | } | |
1127 | de[0].start = cpu_to_le16(cluster); | |
1128 | de[0].starthi = cpu_to_le16(cluster >> 16); | |
1129 | de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart); | |
1130 | de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16); | |
1131 | de[0].size = de[1].size = 0; | |
1132 | memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); | |
1133 | set_buffer_uptodate(bhs[0]); | |
1134 | mark_buffer_dirty(bhs[0]); | |
1135 | ||
1136 | err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); | |
1137 | if (err) | |
1138 | goto error_free; | |
1139 | ||
1140 | return cluster; | |
1141 | ||
1142 | error_free: | |
1143 | fat_free_clusters(dir, cluster); | |
1144 | error: | |
1145 | return err; | |
1146 | } | |
1147 | ||
7c709d00 | 1148 | EXPORT_SYMBOL_GPL(fat_alloc_new_dir); |
1da177e4 LT |
1149 | |
1150 | static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, | |
1151 | int *nr_cluster, struct msdos_dir_entry **de, | |
1152 | struct buffer_head **bh, loff_t *i_pos) | |
1153 | { | |
1154 | struct super_block *sb = dir->i_sb; | |
1155 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1156 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1157 | sector_t blknr, start_blknr, last_blknr; | |
1158 | unsigned long size, copy; | |
1159 | int err, i, n, offset, cluster[2]; | |
1160 | ||
1161 | /* | |
1162 | * The minimum cluster size is 512bytes, and maximum entry | |
1163 | * size is 32*slots (672bytes). So, iff the cluster size is | |
1164 | * 512bytes, we may need two clusters. | |
1165 | */ | |
1166 | size = nr_slots * sizeof(struct msdos_dir_entry); | |
1167 | *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; | |
1168 | BUG_ON(*nr_cluster > 2); | |
1169 | ||
1170 | err = fat_alloc_clusters(dir, cluster, *nr_cluster); | |
1171 | if (err) | |
1172 | goto error; | |
1173 | ||
1174 | /* | |
1175 | * First stage: Fill the directory entry. NOTE: This cluster | |
1176 | * is not referenced from any inode yet, so updates order is | |
1177 | * not important. | |
1178 | */ | |
1179 | i = n = copy = 0; | |
1180 | do { | |
1181 | start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); | |
1182 | last_blknr = start_blknr + sbi->sec_per_clus; | |
1183 | while (blknr < last_blknr) { | |
1184 | bhs[n] = sb_getblk(sb, blknr); | |
1185 | if (!bhs[n]) { | |
1186 | err = -ENOMEM; | |
1187 | goto error_nomem; | |
1188 | } | |
1189 | ||
1190 | /* fill the directory entry */ | |
1191 | copy = min(size, sb->s_blocksize); | |
1192 | memcpy(bhs[n]->b_data, slots, copy); | |
1193 | slots += copy; | |
1194 | size -= copy; | |
1195 | set_buffer_uptodate(bhs[n]); | |
1196 | mark_buffer_dirty(bhs[n]); | |
1197 | if (!size) | |
1198 | break; | |
1199 | n++; | |
1200 | blknr++; | |
1201 | } | |
1202 | } while (++i < *nr_cluster); | |
1203 | ||
1204 | memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); | |
1205 | offset = copy - sizeof(struct msdos_dir_entry); | |
1206 | get_bh(bhs[n]); | |
1207 | *bh = bhs[n]; | |
1208 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
1209 | *i_pos = fat_make_i_pos(sb, *bh, *de); | |
1210 | ||
1211 | /* Second stage: clear the rest of cluster, and write outs */ | |
1212 | err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); | |
1213 | if (err) | |
1214 | goto error_free; | |
1215 | ||
1216 | return cluster[0]; | |
1217 | ||
1218 | error_free: | |
1219 | brelse(*bh); | |
1220 | *bh = NULL; | |
1221 | n = 0; | |
1222 | error_nomem: | |
1223 | for (i = 0; i < n; i++) | |
1224 | bforget(bhs[i]); | |
1225 | fat_free_clusters(dir, cluster[0]); | |
1226 | error: | |
1227 | return err; | |
1228 | } | |
1229 | ||
1230 | int fat_add_entries(struct inode *dir, void *slots, int nr_slots, | |
1231 | struct fat_slot_info *sinfo) | |
1232 | { | |
1233 | struct super_block *sb = dir->i_sb; | |
1234 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1235 | struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ | |
1236 | struct msdos_dir_entry *de; | |
1237 | int err, free_slots, i, nr_bhs; | |
1238 | loff_t pos, i_pos; | |
1239 | ||
1240 | sinfo->nr_slots = nr_slots; | |
1241 | ||
1242 | /* First stage: search free direcotry entries */ | |
1243 | free_slots = nr_bhs = 0; | |
1244 | bh = prev = NULL; | |
1245 | pos = 0; | |
1246 | err = -ENOSPC; | |
1247 | while (fat_get_entry(dir, &pos, &bh, &de) > -1) { | |
1248 | /* check the maximum size of directory */ | |
1249 | if (pos >= FAT_MAX_DIR_SIZE) | |
1250 | goto error; | |
1251 | ||
1252 | if (IS_FREE(de->name)) { | |
1253 | if (prev != bh) { | |
1254 | get_bh(bh); | |
1255 | bhs[nr_bhs] = prev = bh; | |
1256 | nr_bhs++; | |
1257 | } | |
1258 | free_slots++; | |
1259 | if (free_slots == nr_slots) | |
1260 | goto found; | |
1261 | } else { | |
1262 | for (i = 0; i < nr_bhs; i++) | |
1263 | brelse(bhs[i]); | |
1264 | prev = NULL; | |
1265 | free_slots = nr_bhs = 0; | |
1266 | } | |
1267 | } | |
1268 | if (dir->i_ino == MSDOS_ROOT_INO) { | |
1269 | if (sbi->fat_bits != 32) | |
1270 | goto error; | |
1271 | } else if (MSDOS_I(dir)->i_start == 0) { | |
1272 | printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n", | |
1273 | MSDOS_I(dir)->i_pos); | |
1274 | err = -EIO; | |
1275 | goto error; | |
1276 | } | |
1277 | ||
1278 | found: | |
1279 | err = 0; | |
1280 | pos -= free_slots * sizeof(*de); | |
1281 | nr_slots -= free_slots; | |
1282 | if (free_slots) { | |
1283 | /* | |
1284 | * Second stage: filling the free entries with new entries. | |
1285 | * NOTE: If this slots has shortname, first, we write | |
1286 | * the long name slots, then write the short name. | |
1287 | */ | |
1288 | int size = free_slots * sizeof(*de); | |
1289 | int offset = pos & (sb->s_blocksize - 1); | |
1290 | int long_bhs = nr_bhs - (nr_slots == 0); | |
1291 | ||
1292 | /* Fill the long name slots. */ | |
1293 | for (i = 0; i < long_bhs; i++) { | |
1294 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1295 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
1296 | mark_buffer_dirty(bhs[i]); | |
1297 | offset = 0; | |
1298 | slots += copy; | |
1299 | size -= copy; | |
1300 | } | |
1301 | if (long_bhs && IS_DIRSYNC(dir)) | |
1302 | err = fat_sync_bhs(bhs, long_bhs); | |
1303 | if (!err && i < nr_bhs) { | |
1304 | /* Fill the short name slot. */ | |
1305 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1306 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
1307 | mark_buffer_dirty(bhs[i]); | |
1308 | if (IS_DIRSYNC(dir)) | |
1309 | err = sync_dirty_buffer(bhs[i]); | |
1310 | } | |
1311 | for (i = 0; i < nr_bhs; i++) | |
1312 | brelse(bhs[i]); | |
1313 | if (err) | |
1314 | goto error_remove; | |
1315 | } | |
1316 | ||
1317 | if (nr_slots) { | |
1318 | int cluster, nr_cluster; | |
1319 | ||
1320 | /* | |
1321 | * Third stage: allocate the cluster for new entries. | |
1322 | * And initialize the cluster with new entries, then | |
1323 | * add the cluster to dir. | |
1324 | */ | |
1325 | cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, | |
1326 | &de, &bh, &i_pos); | |
1327 | if (cluster < 0) { | |
1328 | err = cluster; | |
1329 | goto error_remove; | |
1330 | } | |
1331 | err = fat_chain_add(dir, cluster, nr_cluster); | |
1332 | if (err) { | |
1333 | fat_free_clusters(dir, cluster); | |
1334 | goto error_remove; | |
1335 | } | |
1336 | if (dir->i_size & (sbi->cluster_size - 1)) { | |
1337 | fat_fs_panic(sb, "Odd directory size"); | |
1338 | dir->i_size = (dir->i_size + sbi->cluster_size - 1) | |
1339 | & ~((loff_t)sbi->cluster_size - 1); | |
1340 | } | |
1341 | dir->i_size += nr_cluster << sbi->cluster_bits; | |
1342 | MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; | |
1343 | } | |
1344 | sinfo->slot_off = pos; | |
1345 | sinfo->de = de; | |
1346 | sinfo->bh = bh; | |
1347 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
1348 | ||
1349 | return 0; | |
1350 | ||
1351 | error: | |
1352 | brelse(bh); | |
1353 | for (i = 0; i < nr_bhs; i++) | |
1354 | brelse(bhs[i]); | |
1355 | return err; | |
1356 | ||
1357 | error_remove: | |
1358 | brelse(bh); | |
1359 | if (free_slots) | |
1360 | __fat_remove_entries(dir, pos, free_slots); | |
1361 | return err; | |
1362 | } | |
1363 | ||
7c709d00 | 1364 | EXPORT_SYMBOL_GPL(fat_add_entries); |