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Commit | Line | Data |
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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> | |
19 | #include <linux/msdos_fs.h> | |
20 | #include <linux/dirent.h> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/buffer_head.h> | |
188f83df | 23 | #include <linux/compat.h> |
1da177e4 LT |
24 | #include <asm/uaccess.h> |
25 | ||
26 | static inline loff_t fat_make_i_pos(struct super_block *sb, | |
27 | struct buffer_head *bh, | |
28 | struct msdos_dir_entry *de) | |
29 | { | |
30 | return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) | |
31 | | (de - (struct msdos_dir_entry *)bh->b_data); | |
32 | } | |
33 | ||
f3ef6f63 KW |
34 | static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, |
35 | sector_t phys) | |
36 | { | |
37 | struct super_block *sb = dir->i_sb; | |
38 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
39 | struct buffer_head *bh; | |
40 | int sec; | |
41 | ||
42 | /* This is not a first sector of cluster, or sec_per_clus == 1 */ | |
43 | if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) | |
44 | return; | |
45 | /* root dir of FAT12/FAT16 */ | |
46 | if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO)) | |
47 | return; | |
48 | ||
83b7c996 OH |
49 | bh = sb_find_get_block(sb, phys); |
50 | if (bh == NULL || !buffer_uptodate(bh)) { | |
f3ef6f63 KW |
51 | for (sec = 0; sec < sbi->sec_per_clus; sec++) |
52 | sb_breadahead(sb, phys + sec); | |
53 | } | |
54 | brelse(bh); | |
55 | } | |
56 | ||
1da177e4 LT |
57 | /* Returns the inode number of the directory entry at offset pos. If bh is |
58 | non-NULL, it is brelse'd before. Pos is incremented. The buffer header is | |
59 | returned in bh. | |
60 | AV. Most often we do it item-by-item. Makes sense to optimize. | |
61 | AV. OK, there we go: if both bh and de are non-NULL we assume that we just | |
62 | AV. want the next entry (took one explicit de=NULL in vfat/namei.c). | |
63 | AV. It's done in fat_get_entry() (inlined), here the slow case lives. | |
64 | AV. Additionally, when we return -1 (i.e. reached the end of directory) | |
65 | AV. we make bh NULL. | |
66 | */ | |
67 | static int fat__get_entry(struct inode *dir, loff_t *pos, | |
68 | struct buffer_head **bh, struct msdos_dir_entry **de) | |
69 | { | |
70 | struct super_block *sb = dir->i_sb; | |
71 | sector_t phys, iblock; | |
e5174baa OH |
72 | unsigned long mapped_blocks; |
73 | int err, offset; | |
1da177e4 LT |
74 | |
75 | next: | |
76 | if (*bh) | |
77 | brelse(*bh); | |
78 | ||
79 | *bh = NULL; | |
80 | iblock = *pos >> sb->s_blocksize_bits; | |
e5174baa | 81 | err = fat_bmap(dir, iblock, &phys, &mapped_blocks); |
1da177e4 LT |
82 | if (err || !phys) |
83 | return -1; /* beyond EOF or error */ | |
84 | ||
f3ef6f63 KW |
85 | fat_dir_readahead(dir, iblock, phys); |
86 | ||
1da177e4 LT |
87 | *bh = sb_bread(sb, phys); |
88 | if (*bh == NULL) { | |
89 | printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n", | |
90 | (unsigned long long)phys); | |
91 | /* skip this block */ | |
92 | *pos = (iblock + 1) << sb->s_blocksize_bits; | |
93 | goto next; | |
94 | } | |
95 | ||
96 | offset = *pos & (sb->s_blocksize - 1); | |
97 | *pos += sizeof(struct msdos_dir_entry); | |
98 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static inline int fat_get_entry(struct inode *dir, loff_t *pos, | |
104 | struct buffer_head **bh, | |
105 | struct msdos_dir_entry **de) | |
106 | { | |
107 | /* Fast stuff first */ | |
108 | if (*bh && *de && | |
109 | (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) { | |
110 | *pos += sizeof(struct msdos_dir_entry); | |
111 | (*de)++; | |
112 | return 0; | |
113 | } | |
114 | return fat__get_entry(dir, pos, bh, de); | |
115 | } | |
116 | ||
117 | /* | |
4de151d8 | 118 | * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. |
1da177e4 LT |
119 | * If uni_xlate is enabled and we can't get a 1:1 conversion, use a |
120 | * colon as an escape character since it is normally invalid on the vfat | |
121 | * filesystem. The following four characters are the hexadecimal digits | |
122 | * of Unicode value. This lets us do a full dump and restore of Unicode | |
123 | * filenames. We could get into some trouble with long Unicode names, | |
124 | * but ignore that right now. | |
125 | * Ahem... Stack smashing in ring 0 isn't fun. Fixed. | |
126 | */ | |
f22032ba KM |
127 | static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int len, |
128 | int uni_xlate, struct nls_table *nls) | |
1da177e4 LT |
129 | { |
130 | wchar_t *ip, ec; | |
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 | ||
170 | static inline int | |
171 | fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) | |
172 | { | |
173 | int charlen; | |
174 | ||
175 | charlen = t->char2uni(c, clen, uni); | |
176 | if (charlen < 0) { | |
177 | *uni = 0x003f; /* a question mark */ | |
178 | charlen = 1; | |
179 | } | |
180 | return charlen; | |
181 | } | |
182 | ||
183 | static inline int | |
184 | fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) | |
185 | { | |
186 | int charlen; | |
187 | wchar_t wc; | |
188 | ||
189 | charlen = t->char2uni(c, clen, &wc); | |
190 | if (charlen < 0) { | |
191 | *uni = 0x003f; /* a question mark */ | |
192 | charlen = 1; | |
193 | } else if (charlen <= 1) { | |
194 | unsigned char nc = t->charset2lower[*c]; | |
195 | ||
196 | if (!nc) | |
197 | nc = *c; | |
198 | ||
199 | if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) { | |
200 | *uni = 0x003f; /* a question mark */ | |
201 | charlen = 1; | |
202 | } | |
203 | } else | |
204 | *uni = wc; | |
205 | ||
206 | return charlen; | |
207 | } | |
208 | ||
209 | static inline int | |
210 | fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, | |
211 | wchar_t *uni_buf, unsigned short opt, int lower) | |
212 | { | |
213 | int len = 0; | |
214 | ||
215 | if (opt & VFAT_SFN_DISPLAY_LOWER) | |
216 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
217 | else if (opt & VFAT_SFN_DISPLAY_WIN95) | |
218 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
219 | else if (opt & VFAT_SFN_DISPLAY_WINNT) { | |
220 | if (lower) | |
221 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
222 | else | |
223 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
224 | } else | |
225 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
226 | ||
227 | return len; | |
228 | } | |
229 | ||
ad2c1604 PE |
230 | enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; |
231 | ||
232 | /** | |
233 | * fat_parse_long - Parse extended directory entry. | |
234 | * | |
235 | * This function returns zero on success, negative value on error, or one of | |
236 | * the following: | |
237 | * | |
238 | * %PARSE_INVALID - Directory entry is invalid. | |
239 | * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. | |
240 | * %PARSE_EOF - Directory has no more entries. | |
241 | */ | |
242 | static int fat_parse_long(struct inode *dir, loff_t *pos, | |
243 | struct buffer_head **bh, struct msdos_dir_entry **de, | |
244 | wchar_t **unicode, unsigned char *nr_slots) | |
245 | { | |
246 | struct msdos_dir_slot *ds; | |
247 | unsigned char id, slot, slots, alias_checksum; | |
248 | ||
249 | if (!*unicode) { | |
250 | *unicode = (wchar_t *)__get_free_page(GFP_KERNEL); | |
251 | if (!*unicode) { | |
252 | brelse(*bh); | |
253 | return -ENOMEM; | |
254 | } | |
255 | } | |
256 | parse_long: | |
257 | slots = 0; | |
258 | ds = (struct msdos_dir_slot *)*de; | |
259 | id = ds->id; | |
260 | if (!(id & 0x40)) | |
261 | return PARSE_INVALID; | |
262 | slots = id & ~0x40; | |
263 | if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ | |
264 | return PARSE_INVALID; | |
265 | *nr_slots = slots; | |
266 | alias_checksum = ds->alias_checksum; | |
267 | ||
268 | slot = slots; | |
269 | while (1) { | |
270 | int offset; | |
271 | ||
272 | slot--; | |
273 | offset = slot * 13; | |
274 | fat16_towchar(*unicode + offset, ds->name0_4, 5); | |
275 | fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); | |
276 | fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); | |
277 | ||
278 | if (ds->id & 0x40) | |
279 | (*unicode)[offset + 13] = 0; | |
280 | if (fat_get_entry(dir, pos, bh, de) < 0) | |
281 | return PARSE_EOF; | |
282 | if (slot == 0) | |
283 | break; | |
284 | ds = (struct msdos_dir_slot *)*de; | |
285 | if (ds->attr != ATTR_EXT) | |
286 | return PARSE_NOT_LONGNAME; | |
287 | if ((ds->id & ~0x40) != slot) | |
288 | goto parse_long; | |
289 | if (ds->alias_checksum != alias_checksum) | |
290 | goto parse_long; | |
291 | } | |
292 | if ((*de)->name[0] == DELETED_FLAG) | |
293 | return PARSE_INVALID; | |
294 | if ((*de)->attr == ATTR_EXT) | |
295 | goto parse_long; | |
296 | if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) | |
297 | return PARSE_INVALID; | |
298 | if (fat_checksum((*de)->name) != alias_checksum) | |
299 | *nr_slots = 0; | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
1da177e4 LT |
304 | /* |
305 | * Return values: negative -> error, 0 -> not found, positive -> found, | |
306 | * value is the total amount of slots, including the shortname entry. | |
307 | */ | |
308 | int fat_search_long(struct inode *inode, const unsigned char *name, | |
309 | int name_len, struct fat_slot_info *sinfo) | |
310 | { | |
311 | struct super_block *sb = inode->i_sb; | |
312 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
313 | struct buffer_head *bh = NULL; | |
314 | struct msdos_dir_entry *de; | |
315 | struct nls_table *nls_io = sbi->nls_io; | |
316 | struct nls_table *nls_disk = sbi->nls_disk; | |
317 | wchar_t bufuname[14]; | |
f22032ba KM |
318 | unsigned char nr_slots; |
319 | int xlate_len; | |
1da177e4 | 320 | wchar_t *unicode = NULL; |
f22032ba KM |
321 | unsigned char work[MSDOS_NAME]; |
322 | unsigned char *bufname = NULL; | |
1da177e4 LT |
323 | int uni_xlate = sbi->options.unicode_xlate; |
324 | int utf8 = sbi->options.utf8; | |
325 | int anycase = (sbi->options.name_check != 's'); | |
326 | unsigned short opt_shortname = sbi->options.shortname; | |
327 | loff_t cpos = 0; | |
328 | int chl, i, j, last_u, err; | |
329 | ||
f22032ba KM |
330 | bufname = (unsigned char*)__get_free_page(GFP_KERNEL); |
331 | if (!bufname) | |
332 | return -ENOMEM; | |
333 | ||
1da177e4 LT |
334 | err = -ENOENT; |
335 | while(1) { | |
336 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) | |
337 | goto EODir; | |
338 | parse_record: | |
339 | nr_slots = 0; | |
340 | if (de->name[0] == DELETED_FLAG) | |
341 | continue; | |
342 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) | |
343 | continue; | |
344 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) | |
345 | continue; | |
346 | if (de->attr == ATTR_EXT) { | |
ad2c1604 PE |
347 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
348 | &unicode, &nr_slots); | |
349 | if (status < 0) | |
350 | return status; | |
351 | else if (status == PARSE_INVALID) | |
1da177e4 | 352 | continue; |
ad2c1604 PE |
353 | else if (status == PARSE_NOT_LONGNAME) |
354 | goto parse_record; | |
355 | else if (status == PARSE_EOF) | |
356 | goto EODir; | |
1da177e4 LT |
357 | } |
358 | ||
359 | memcpy(work, de->name, sizeof(de->name)); | |
360 | /* see namei.c, msdos_format_name */ | |
361 | if (work[0] == 0x05) | |
362 | work[0] = 0xE5; | |
363 | for (i = 0, j = 0, last_u = 0; i < 8;) { | |
9aacd599 OH |
364 | if (!work[i]) |
365 | break; | |
1da177e4 LT |
366 | chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, |
367 | &bufuname[j++], opt_shortname, | |
368 | de->lcase & CASE_LOWER_BASE); | |
369 | if (chl <= 1) { | |
370 | if (work[i] != ' ') | |
371 | last_u = j; | |
372 | } else { | |
373 | last_u = j; | |
374 | } | |
375 | i += chl; | |
376 | } | |
377 | j = last_u; | |
378 | fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); | |
9aacd599 OH |
379 | for (i = 8; i < MSDOS_NAME;) { |
380 | if (!work[i]) | |
381 | break; | |
382 | chl = fat_shortname2uni(nls_disk, &work[i], | |
383 | MSDOS_NAME - i, | |
1da177e4 LT |
384 | &bufuname[j++], opt_shortname, |
385 | de->lcase & CASE_LOWER_EXT); | |
386 | if (chl <= 1) { | |
9aacd599 | 387 | if (work[i] != ' ') |
1da177e4 LT |
388 | last_u = j; |
389 | } else { | |
390 | last_u = j; | |
391 | } | |
392 | i += chl; | |
393 | } | |
394 | if (!last_u) | |
395 | continue; | |
396 | ||
397 | bufuname[last_u] = 0x0000; | |
398 | xlate_len = utf8 | |
f22032ba KM |
399 | ?utf8_wcstombs(bufname, bufuname, PAGE_SIZE) |
400 | :uni16_to_x8(bufname, bufuname, PAGE_SIZE, uni_xlate, nls_io); | |
1da177e4 LT |
401 | if (xlate_len == name_len) |
402 | if ((!anycase && !memcmp(name, bufname, xlate_len)) || | |
403 | (anycase && !nls_strnicmp(nls_io, name, bufname, | |
404 | xlate_len))) | |
405 | goto Found; | |
406 | ||
407 | if (nr_slots) { | |
408 | xlate_len = utf8 | |
f22032ba KM |
409 | ?utf8_wcstombs(bufname, unicode, PAGE_SIZE) |
410 | :uni16_to_x8(bufname, unicode, PAGE_SIZE, uni_xlate, nls_io); | |
1da177e4 LT |
411 | if (xlate_len != name_len) |
412 | continue; | |
413 | if ((!anycase && !memcmp(name, bufname, xlate_len)) || | |
414 | (anycase && !nls_strnicmp(nls_io, name, bufname, | |
415 | xlate_len))) | |
416 | goto Found; | |
417 | } | |
418 | } | |
419 | ||
420 | Found: | |
421 | nr_slots++; /* include the de */ | |
422 | sinfo->slot_off = cpos - nr_slots * sizeof(*de); | |
423 | sinfo->nr_slots = nr_slots; | |
424 | sinfo->de = de; | |
425 | sinfo->bh = bh; | |
426 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
427 | err = 0; | |
428 | EODir: | |
f22032ba KM |
429 | if (bufname) |
430 | free_page((unsigned long)bufname); | |
1da177e4 LT |
431 | if (unicode) |
432 | free_page((unsigned long)unicode); | |
433 | ||
434 | return err; | |
435 | } | |
436 | ||
7c709d00 | 437 | EXPORT_SYMBOL_GPL(fat_search_long); |
1da177e4 LT |
438 | |
439 | struct fat_ioctl_filldir_callback { | |
c483bab0 | 440 | void __user *dirent; |
1da177e4 LT |
441 | int result; |
442 | /* for dir ioctl */ | |
443 | const char *longname; | |
444 | int long_len; | |
445 | const char *shortname; | |
446 | int short_len; | |
447 | }; | |
448 | ||
ad2c1604 PE |
449 | static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, |
450 | filldir_t filldir, int short_only, int both) | |
1da177e4 LT |
451 | { |
452 | struct super_block *sb = inode->i_sb; | |
453 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
454 | struct buffer_head *bh; | |
455 | struct msdos_dir_entry *de; | |
456 | struct nls_table *nls_io = sbi->nls_io; | |
457 | struct nls_table *nls_disk = sbi->nls_disk; | |
458 | unsigned char long_slots; | |
459 | const char *fill_name; | |
460 | int fill_len; | |
461 | wchar_t bufuname[14]; | |
462 | wchar_t *unicode = NULL; | |
9aacd599 | 463 | unsigned char c, work[MSDOS_NAME], bufname[56], *ptname = bufname; |
1da177e4 LT |
464 | unsigned long lpos, dummy, *furrfu = &lpos; |
465 | int uni_xlate = sbi->options.unicode_xlate; | |
466 | int isvfat = sbi->options.isvfat; | |
467 | int utf8 = sbi->options.utf8; | |
468 | int nocase = sbi->options.nocase; | |
469 | unsigned short opt_shortname = sbi->options.shortname; | |
470 | unsigned long inum; | |
471 | int chi, chl, i, i2, j, last, last_u, dotoffset = 0; | |
472 | loff_t cpos; | |
473 | int ret = 0; | |
474 | ||
475 | lock_kernel(); | |
476 | ||
477 | cpos = filp->f_pos; | |
478 | /* Fake . and .. for the root directory. */ | |
479 | if (inode->i_ino == MSDOS_ROOT_INO) { | |
480 | while (cpos < 2) { | |
481 | if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0) | |
482 | goto out; | |
483 | cpos++; | |
484 | filp->f_pos++; | |
485 | } | |
486 | if (cpos == 2) { | |
487 | dummy = 2; | |
488 | furrfu = &dummy; | |
489 | cpos = 0; | |
490 | } | |
491 | } | |
492 | if (cpos & (sizeof(struct msdos_dir_entry)-1)) { | |
493 | ret = -ENOENT; | |
494 | goto out; | |
495 | } | |
496 | ||
497 | bh = NULL; | |
498 | GetNew: | |
1da177e4 LT |
499 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
500 | goto EODir; | |
ad2c1604 PE |
501 | parse_record: |
502 | long_slots = 0; | |
1da177e4 LT |
503 | /* Check for long filename entry */ |
504 | if (isvfat) { | |
505 | if (de->name[0] == DELETED_FLAG) | |
506 | goto RecEnd; | |
507 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) | |
508 | goto RecEnd; | |
509 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) | |
510 | goto RecEnd; | |
511 | } else { | |
512 | if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) | |
513 | goto RecEnd; | |
514 | } | |
515 | ||
516 | if (isvfat && de->attr == ATTR_EXT) { | |
ad2c1604 PE |
517 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
518 | &unicode, &long_slots); | |
519 | if (status < 0) { | |
520 | filp->f_pos = cpos; | |
521 | ret = status; | |
522 | goto out; | |
523 | } else if (status == PARSE_INVALID) | |
1da177e4 | 524 | goto RecEnd; |
ad2c1604 PE |
525 | else if (status == PARSE_NOT_LONGNAME) |
526 | goto parse_record; | |
527 | else if (status == PARSE_EOF) | |
528 | goto EODir; | |
1da177e4 LT |
529 | } |
530 | ||
531 | if (sbi->options.dotsOK) { | |
532 | ptname = bufname; | |
533 | dotoffset = 0; | |
534 | if (de->attr & ATTR_HIDDEN) { | |
535 | *ptname++ = '.'; | |
536 | dotoffset = 1; | |
537 | } | |
538 | } | |
539 | ||
540 | memcpy(work, de->name, sizeof(de->name)); | |
541 | /* see namei.c, msdos_format_name */ | |
542 | if (work[0] == 0x05) | |
543 | work[0] = 0xE5; | |
544 | for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) { | |
9aacd599 OH |
545 | if (!(c = work[i])) |
546 | break; | |
1da177e4 LT |
547 | chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, |
548 | &bufuname[j++], opt_shortname, | |
549 | de->lcase & CASE_LOWER_BASE); | |
550 | if (chl <= 1) { | |
551 | ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; | |
552 | if (c != ' ') { | |
553 | last = i; | |
554 | last_u = j; | |
555 | } | |
556 | } else { | |
557 | last_u = j; | |
558 | for (chi = 0; chi < chl && i < 8; chi++) { | |
559 | ptname[i] = work[i]; | |
560 | i++; last = i; | |
561 | } | |
562 | } | |
563 | } | |
564 | i = last; | |
565 | j = last_u; | |
566 | fat_short2uni(nls_disk, ".", 1, &bufuname[j++]); | |
567 | ptname[i++] = '.'; | |
9aacd599 OH |
568 | for (i2 = 8; i2 < MSDOS_NAME;) { |
569 | if (!(c = work[i2])) | |
570 | break; | |
571 | chl = fat_shortname2uni(nls_disk, &work[i2], MSDOS_NAME - i2, | |
1da177e4 LT |
572 | &bufuname[j++], opt_shortname, |
573 | de->lcase & CASE_LOWER_EXT); | |
574 | if (chl <= 1) { | |
575 | i2++; | |
576 | ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c; | |
577 | if (c != ' ') { | |
578 | last = i; | |
579 | last_u = j; | |
580 | } | |
581 | } else { | |
582 | last_u = j; | |
9aacd599 OH |
583 | for (chi = 0; chi < chl && i2 < MSDOS_NAME; chi++) { |
584 | ptname[i++] = work[i2++]; | |
1da177e4 LT |
585 | last = i; |
586 | } | |
587 | } | |
588 | } | |
589 | if (!last) | |
590 | goto RecEnd; | |
591 | ||
592 | i = last + dotoffset; | |
593 | j = last_u; | |
594 | ||
595 | lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry); | |
596 | if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) | |
597 | inum = inode->i_ino; | |
598 | else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
dba32306 | 599 | inum = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
600 | } else { |
601 | loff_t i_pos = fat_make_i_pos(sb, bh, de); | |
602 | struct inode *tmp = fat_iget(sb, i_pos); | |
603 | if (tmp) { | |
604 | inum = tmp->i_ino; | |
605 | iput(tmp); | |
606 | } else | |
607 | inum = iunique(sb, MSDOS_ROOT_INO); | |
608 | } | |
609 | ||
610 | if (isvfat) { | |
611 | bufuname[j] = 0x0000; | |
612 | i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname)) | |
f22032ba | 613 | : uni16_to_x8(bufname, bufuname, sizeof(bufname), uni_xlate, nls_io); |
1da177e4 LT |
614 | } |
615 | ||
616 | fill_name = bufname; | |
617 | fill_len = i; | |
618 | if (!short_only && long_slots) { | |
619 | /* convert the unicode long name. 261 is maximum size | |
620 | * of unicode buffer. (13 * slots + nul) */ | |
621 | void *longname = unicode + 261; | |
622 | int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0])); | |
623 | int long_len = utf8 | |
624 | ? utf8_wcstombs(longname, unicode, buf_size) | |
f22032ba | 625 | : uni16_to_x8(longname, unicode, buf_size, uni_xlate, nls_io); |
1da177e4 LT |
626 | |
627 | if (!both) { | |
628 | fill_name = longname; | |
629 | fill_len = long_len; | |
630 | } else { | |
631 | /* hack for fat_ioctl_filldir() */ | |
632 | struct fat_ioctl_filldir_callback *p = dirent; | |
633 | ||
634 | p->longname = longname; | |
635 | p->long_len = long_len; | |
636 | p->shortname = bufname; | |
637 | p->short_len = i; | |
638 | fill_name = NULL; | |
639 | fill_len = 0; | |
640 | } | |
641 | } | |
642 | if (filldir(dirent, fill_name, fill_len, *furrfu, inum, | |
643 | (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0) | |
644 | goto FillFailed; | |
645 | ||
646 | RecEnd: | |
647 | furrfu = &lpos; | |
648 | filp->f_pos = cpos; | |
649 | goto GetNew; | |
650 | EODir: | |
651 | filp->f_pos = cpos; | |
652 | FillFailed: | |
f3ef6f63 | 653 | brelse(bh); |
1da177e4 LT |
654 | if (unicode) |
655 | free_page((unsigned long)unicode); | |
656 | out: | |
657 | unlock_kernel(); | |
658 | return ret; | |
659 | } | |
660 | ||
661 | static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
662 | { | |
dba32306 | 663 | struct inode *inode = filp->f_path.dentry->d_inode; |
ad2c1604 | 664 | return __fat_readdir(inode, filp, dirent, filldir, 0, 0); |
1da177e4 LT |
665 | } |
666 | ||
c483bab0 OH |
667 | #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ |
668 | static int func(void *__buf, const char *name, int name_len, \ | |
669 | loff_t offset, u64 ino, unsigned int d_type) \ | |
670 | { \ | |
671 | struct fat_ioctl_filldir_callback *buf = __buf; \ | |
672 | struct dirent_type __user *d1 = buf->dirent; \ | |
673 | struct dirent_type __user *d2 = d1 + 1; \ | |
674 | \ | |
675 | if (buf->result) \ | |
676 | return -EINVAL; \ | |
677 | buf->result++; \ | |
678 | \ | |
679 | if (name != NULL) { \ | |
680 | /* dirent has only short name */ \ | |
681 | if (name_len >= sizeof(d1->d_name)) \ | |
682 | name_len = sizeof(d1->d_name) - 1; \ | |
683 | \ | |
684 | if (put_user(0, d2->d_name) || \ | |
685 | put_user(0, &d2->d_reclen) || \ | |
686 | copy_to_user(d1->d_name, name, name_len) || \ | |
687 | put_user(0, d1->d_name + name_len) || \ | |
688 | put_user(name_len, &d1->d_reclen)) \ | |
689 | goto efault; \ | |
690 | } else { \ | |
691 | /* dirent has short and long name */ \ | |
692 | const char *longname = buf->longname; \ | |
693 | int long_len = buf->long_len; \ | |
694 | const char *shortname = buf->shortname; \ | |
695 | int short_len = buf->short_len; \ | |
696 | \ | |
697 | if (long_len >= sizeof(d1->d_name)) \ | |
698 | long_len = sizeof(d1->d_name) - 1; \ | |
699 | if (short_len >= sizeof(d1->d_name)) \ | |
700 | short_len = sizeof(d1->d_name) - 1; \ | |
701 | \ | |
702 | if (copy_to_user(d2->d_name, longname, long_len) || \ | |
703 | put_user(0, d2->d_name + long_len) || \ | |
704 | put_user(long_len, &d2->d_reclen) || \ | |
705 | put_user(ino, &d2->d_ino) || \ | |
706 | put_user(offset, &d2->d_off) || \ | |
707 | copy_to_user(d1->d_name, shortname, short_len) || \ | |
708 | put_user(0, d1->d_name + short_len) || \ | |
709 | put_user(short_len, &d1->d_reclen)) \ | |
710 | goto efault; \ | |
711 | } \ | |
712 | return 0; \ | |
713 | efault: \ | |
714 | buf->result = -EFAULT; \ | |
715 | return -EFAULT; \ | |
716 | } | |
717 | ||
718 | FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, dirent) | |
719 | ||
720 | static int fat_ioctl_readdir(struct inode *inode, struct file *filp, | |
721 | void __user *dirent, filldir_t filldir, | |
722 | int short_only, int both) | |
1da177e4 | 723 | { |
c483bab0 OH |
724 | struct fat_ioctl_filldir_callback buf; |
725 | int ret; | |
726 | ||
727 | buf.dirent = dirent; | |
728 | buf.result = 0; | |
729 | mutex_lock(&inode->i_mutex); | |
730 | ret = -ENOENT; | |
731 | if (!IS_DEADDIR(inode)) { | |
732 | ret = __fat_readdir(inode, filp, &buf, filldir, | |
733 | short_only, both); | |
1da177e4 | 734 | } |
c483bab0 OH |
735 | mutex_unlock(&inode->i_mutex); |
736 | if (ret >= 0) | |
737 | ret = buf.result; | |
738 | return ret; | |
1da177e4 LT |
739 | } |
740 | ||
c483bab0 OH |
741 | static int fat_dir_ioctl(struct inode *inode, struct file *filp, |
742 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 743 | { |
c483bab0 OH |
744 | struct dirent __user *d1 = (struct dirent __user *)arg; |
745 | int short_only, both; | |
1da177e4 LT |
746 | |
747 | switch (cmd) { | |
748 | case VFAT_IOCTL_READDIR_SHORT: | |
749 | short_only = 1; | |
750 | both = 0; | |
751 | break; | |
752 | case VFAT_IOCTL_READDIR_BOTH: | |
753 | short_only = 0; | |
754 | both = 1; | |
755 | break; | |
756 | default: | |
757 | return fat_generic_ioctl(inode, filp, cmd, arg); | |
758 | } | |
759 | ||
1da177e4 LT |
760 | if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2]))) |
761 | return -EFAULT; | |
762 | /* | |
763 | * Yes, we don't need this put_user() absolutely. However old | |
764 | * code didn't return the right value. So, app use this value, | |
765 | * in order to check whether it is EOF. | |
766 | */ | |
767 | if (put_user(0, &d1->d_reclen)) | |
768 | return -EFAULT; | |
769 | ||
c483bab0 OH |
770 | return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, |
771 | short_only, both); | |
1da177e4 LT |
772 | } |
773 | ||
188f83df DH |
774 | #ifdef CONFIG_COMPAT |
775 | #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) | |
776 | #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) | |
777 | ||
c483bab0 | 778 | FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) |
188f83df | 779 | |
c483bab0 | 780 | static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, |
188f83df DH |
781 | unsigned long arg) |
782 | { | |
c483bab0 OH |
783 | struct inode *inode = filp->f_path.dentry->d_inode; |
784 | struct compat_dirent __user *d1 = compat_ptr(arg); | |
785 | int short_only, both; | |
188f83df DH |
786 | |
787 | switch (cmd) { | |
188f83df | 788 | case VFAT_IOCTL_READDIR_SHORT32: |
c483bab0 OH |
789 | short_only = 1; |
790 | both = 0; | |
791 | break; | |
792 | case VFAT_IOCTL_READDIR_BOTH32: | |
793 | short_only = 0; | |
794 | both = 1; | |
188f83df DH |
795 | break; |
796 | default: | |
797 | return -ENOIOCTLCMD; | |
798 | } | |
799 | ||
c483bab0 OH |
800 | if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2]))) |
801 | return -EFAULT; | |
802 | /* | |
803 | * Yes, we don't need this put_user() absolutely. However old | |
804 | * code didn't return the right value. So, app use this value, | |
805 | * in order to check whether it is EOF. | |
806 | */ | |
807 | if (put_user(0, &d1->d_reclen)) | |
808 | return -EFAULT; | |
809 | ||
810 | return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, | |
811 | short_only, both); | |
188f83df DH |
812 | } |
813 | #endif /* CONFIG_COMPAT */ | |
814 | ||
4b6f5d20 | 815 | const struct file_operations fat_dir_operations = { |
1da177e4 LT |
816 | .read = generic_read_dir, |
817 | .readdir = fat_readdir, | |
818 | .ioctl = fat_dir_ioctl, | |
188f83df DH |
819 | #ifdef CONFIG_COMPAT |
820 | .compat_ioctl = fat_compat_dir_ioctl, | |
821 | #endif | |
1da177e4 LT |
822 | .fsync = file_fsync, |
823 | }; | |
824 | ||
825 | static int fat_get_short_entry(struct inode *dir, loff_t *pos, | |
826 | struct buffer_head **bh, | |
827 | struct msdos_dir_entry **de) | |
828 | { | |
829 | while (fat_get_entry(dir, pos, bh, de) >= 0) { | |
830 | /* free entry or long name entry or volume label */ | |
831 | if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) | |
832 | return 0; | |
833 | } | |
834 | return -ENOENT; | |
835 | } | |
836 | ||
837 | /* | |
838 | * The ".." entry can not provide the "struct fat_slot_info" informations | |
839 | * for inode. So, this function provide the some informations only. | |
840 | */ | |
841 | int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, | |
842 | struct msdos_dir_entry **de, loff_t *i_pos) | |
843 | { | |
844 | loff_t offset; | |
845 | ||
846 | offset = 0; | |
847 | *bh = NULL; | |
848 | while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { | |
849 | if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
850 | *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de); | |
851 | return 0; | |
852 | } | |
853 | } | |
854 | return -ENOENT; | |
855 | } | |
856 | ||
7c709d00 | 857 | EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); |
1da177e4 LT |
858 | |
859 | /* See if directory is empty */ | |
860 | int fat_dir_empty(struct inode *dir) | |
861 | { | |
862 | struct buffer_head *bh; | |
863 | struct msdos_dir_entry *de; | |
864 | loff_t cpos; | |
865 | int result = 0; | |
866 | ||
867 | bh = NULL; | |
868 | cpos = 0; | |
869 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
870 | if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && | |
871 | strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
872 | result = -ENOTEMPTY; | |
873 | break; | |
874 | } | |
875 | } | |
876 | brelse(bh); | |
877 | return result; | |
878 | } | |
879 | ||
7c709d00 | 880 | EXPORT_SYMBOL_GPL(fat_dir_empty); |
1da177e4 LT |
881 | |
882 | /* | |
883 | * fat_subdirs counts the number of sub-directories of dir. It can be run | |
884 | * on directories being created. | |
885 | */ | |
886 | int fat_subdirs(struct inode *dir) | |
887 | { | |
888 | struct buffer_head *bh; | |
889 | struct msdos_dir_entry *de; | |
890 | loff_t cpos; | |
891 | int count = 0; | |
892 | ||
893 | bh = NULL; | |
894 | cpos = 0; | |
895 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
896 | if (de->attr & ATTR_DIR) | |
897 | count++; | |
898 | } | |
899 | brelse(bh); | |
900 | return count; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Scans a directory for a given file (name points to its formatted name). | |
905 | * Returns an error code or zero. | |
906 | */ | |
907 | int fat_scan(struct inode *dir, const unsigned char *name, | |
908 | struct fat_slot_info *sinfo) | |
909 | { | |
910 | struct super_block *sb = dir->i_sb; | |
911 | ||
912 | sinfo->slot_off = 0; | |
913 | sinfo->bh = NULL; | |
914 | while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, | |
915 | &sinfo->de) >= 0) { | |
916 | if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { | |
917 | sinfo->slot_off -= sizeof(*sinfo->de); | |
918 | sinfo->nr_slots = 1; | |
919 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
920 | return 0; | |
921 | } | |
922 | } | |
923 | return -ENOENT; | |
924 | } | |
925 | ||
7c709d00 | 926 | EXPORT_SYMBOL_GPL(fat_scan); |
1da177e4 LT |
927 | |
928 | static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) | |
929 | { | |
930 | struct super_block *sb = dir->i_sb; | |
931 | struct buffer_head *bh; | |
932 | struct msdos_dir_entry *de, *endp; | |
933 | int err = 0, orig_slots; | |
934 | ||
935 | while (nr_slots) { | |
936 | bh = NULL; | |
937 | if (fat_get_entry(dir, &pos, &bh, &de) < 0) { | |
938 | err = -EIO; | |
939 | break; | |
940 | } | |
941 | ||
942 | orig_slots = nr_slots; | |
943 | endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); | |
944 | while (nr_slots && de < endp) { | |
945 | de->name[0] = DELETED_FLAG; | |
946 | de++; | |
947 | nr_slots--; | |
948 | } | |
949 | mark_buffer_dirty(bh); | |
950 | if (IS_DIRSYNC(dir)) | |
951 | err = sync_dirty_buffer(bh); | |
952 | brelse(bh); | |
953 | if (err) | |
954 | break; | |
955 | ||
956 | /* pos is *next* de's position, so this does `- sizeof(de)' */ | |
957 | pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); | |
958 | } | |
959 | ||
960 | return err; | |
961 | } | |
962 | ||
963 | int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) | |
964 | { | |
965 | struct msdos_dir_entry *de; | |
966 | struct buffer_head *bh; | |
967 | int err = 0, nr_slots; | |
968 | ||
969 | /* | |
970 | * First stage: Remove the shortname. By this, the directory | |
971 | * entry is removed. | |
972 | */ | |
973 | nr_slots = sinfo->nr_slots; | |
974 | de = sinfo->de; | |
975 | sinfo->de = NULL; | |
976 | bh = sinfo->bh; | |
977 | sinfo->bh = NULL; | |
978 | while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { | |
979 | de->name[0] = DELETED_FLAG; | |
980 | de--; | |
981 | nr_slots--; | |
982 | } | |
983 | mark_buffer_dirty(bh); | |
984 | if (IS_DIRSYNC(dir)) | |
985 | err = sync_dirty_buffer(bh); | |
986 | brelse(bh); | |
987 | if (err) | |
988 | return err; | |
989 | dir->i_version++; | |
990 | ||
991 | if (nr_slots) { | |
992 | /* | |
993 | * Second stage: remove the remaining longname slots. | |
994 | * (This directory entry is already removed, and so return | |
995 | * the success) | |
996 | */ | |
997 | err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); | |
998 | if (err) { | |
999 | printk(KERN_WARNING | |
1000 | "FAT: Couldn't remove the long name slots\n"); | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC; | |
1005 | if (IS_DIRSYNC(dir)) | |
1006 | (void)fat_sync_inode(dir); | |
1007 | else | |
1008 | mark_inode_dirty(dir); | |
1009 | ||
1010 | return 0; | |
1011 | } | |
1012 | ||
7c709d00 | 1013 | EXPORT_SYMBOL_GPL(fat_remove_entries); |
1da177e4 LT |
1014 | |
1015 | static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, | |
1016 | struct buffer_head **bhs, int nr_bhs) | |
1017 | { | |
1018 | struct super_block *sb = dir->i_sb; | |
1019 | sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; | |
1020 | int err, i, n; | |
1021 | ||
1022 | /* Zeroing the unused blocks on this cluster */ | |
1023 | blknr += nr_used; | |
1024 | n = nr_used; | |
1025 | while (blknr < last_blknr) { | |
1026 | bhs[n] = sb_getblk(sb, blknr); | |
1027 | if (!bhs[n]) { | |
1028 | err = -ENOMEM; | |
1029 | goto error; | |
1030 | } | |
1031 | memset(bhs[n]->b_data, 0, sb->s_blocksize); | |
1032 | set_buffer_uptodate(bhs[n]); | |
1033 | mark_buffer_dirty(bhs[n]); | |
1034 | ||
1035 | n++; | |
1036 | blknr++; | |
1037 | if (n == nr_bhs) { | |
1038 | if (IS_DIRSYNC(dir)) { | |
1039 | err = fat_sync_bhs(bhs, n); | |
1040 | if (err) | |
1041 | goto error; | |
1042 | } | |
1043 | for (i = 0; i < n; i++) | |
1044 | brelse(bhs[i]); | |
1045 | n = 0; | |
1046 | } | |
1047 | } | |
1048 | if (IS_DIRSYNC(dir)) { | |
1049 | err = fat_sync_bhs(bhs, n); | |
1050 | if (err) | |
1051 | goto error; | |
1052 | } | |
1053 | for (i = 0; i < n; i++) | |
1054 | brelse(bhs[i]); | |
1055 | ||
1056 | return 0; | |
1057 | ||
1058 | error: | |
1059 | for (i = 0; i < n; i++) | |
1060 | bforget(bhs[i]); | |
1061 | return err; | |
1062 | } | |
1063 | ||
1064 | int fat_alloc_new_dir(struct inode *dir, struct timespec *ts) | |
1065 | { | |
1066 | struct super_block *sb = dir->i_sb; | |
1067 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1068 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1069 | struct msdos_dir_entry *de; | |
1070 | sector_t blknr; | |
1071 | __le16 date, time; | |
1072 | int err, cluster; | |
1073 | ||
1074 | err = fat_alloc_clusters(dir, &cluster, 1); | |
1075 | if (err) | |
1076 | goto error; | |
1077 | ||
1078 | blknr = fat_clus_to_blknr(sbi, cluster); | |
1079 | bhs[0] = sb_getblk(sb, blknr); | |
1080 | if (!bhs[0]) { | |
1081 | err = -ENOMEM; | |
1082 | goto error_free; | |
1083 | } | |
1084 | ||
1085 | fat_date_unix2dos(ts->tv_sec, &time, &date); | |
1086 | ||
1087 | de = (struct msdos_dir_entry *)bhs[0]->b_data; | |
1088 | /* filling the new directory slots ("." and ".." entries) */ | |
1089 | memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); | |
1090 | memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); | |
1091 | de->attr = de[1].attr = ATTR_DIR; | |
1092 | de[0].lcase = de[1].lcase = 0; | |
1093 | de[0].time = de[1].time = time; | |
1094 | de[0].date = de[1].date = date; | |
1095 | de[0].ctime_cs = de[1].ctime_cs = 0; | |
1096 | if (sbi->options.isvfat) { | |
1097 | /* extra timestamps */ | |
1098 | de[0].ctime = de[1].ctime = time; | |
1099 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; | |
1100 | } else { | |
1101 | de[0].ctime = de[1].ctime = 0; | |
1102 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; | |
1103 | } | |
1104 | de[0].start = cpu_to_le16(cluster); | |
1105 | de[0].starthi = cpu_to_le16(cluster >> 16); | |
1106 | de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart); | |
1107 | de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16); | |
1108 | de[0].size = de[1].size = 0; | |
1109 | memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); | |
1110 | set_buffer_uptodate(bhs[0]); | |
1111 | mark_buffer_dirty(bhs[0]); | |
1112 | ||
1113 | err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); | |
1114 | if (err) | |
1115 | goto error_free; | |
1116 | ||
1117 | return cluster; | |
1118 | ||
1119 | error_free: | |
1120 | fat_free_clusters(dir, cluster); | |
1121 | error: | |
1122 | return err; | |
1123 | } | |
1124 | ||
7c709d00 | 1125 | EXPORT_SYMBOL_GPL(fat_alloc_new_dir); |
1da177e4 LT |
1126 | |
1127 | static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, | |
1128 | int *nr_cluster, struct msdos_dir_entry **de, | |
1129 | struct buffer_head **bh, loff_t *i_pos) | |
1130 | { | |
1131 | struct super_block *sb = dir->i_sb; | |
1132 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1133 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1134 | sector_t blknr, start_blknr, last_blknr; | |
1135 | unsigned long size, copy; | |
1136 | int err, i, n, offset, cluster[2]; | |
1137 | ||
1138 | /* | |
1139 | * The minimum cluster size is 512bytes, and maximum entry | |
1140 | * size is 32*slots (672bytes). So, iff the cluster size is | |
1141 | * 512bytes, we may need two clusters. | |
1142 | */ | |
1143 | size = nr_slots * sizeof(struct msdos_dir_entry); | |
1144 | *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; | |
1145 | BUG_ON(*nr_cluster > 2); | |
1146 | ||
1147 | err = fat_alloc_clusters(dir, cluster, *nr_cluster); | |
1148 | if (err) | |
1149 | goto error; | |
1150 | ||
1151 | /* | |
1152 | * First stage: Fill the directory entry. NOTE: This cluster | |
1153 | * is not referenced from any inode yet, so updates order is | |
1154 | * not important. | |
1155 | */ | |
1156 | i = n = copy = 0; | |
1157 | do { | |
1158 | start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); | |
1159 | last_blknr = start_blknr + sbi->sec_per_clus; | |
1160 | while (blknr < last_blknr) { | |
1161 | bhs[n] = sb_getblk(sb, blknr); | |
1162 | if (!bhs[n]) { | |
1163 | err = -ENOMEM; | |
1164 | goto error_nomem; | |
1165 | } | |
1166 | ||
1167 | /* fill the directory entry */ | |
1168 | copy = min(size, sb->s_blocksize); | |
1169 | memcpy(bhs[n]->b_data, slots, copy); | |
1170 | slots += copy; | |
1171 | size -= copy; | |
1172 | set_buffer_uptodate(bhs[n]); | |
1173 | mark_buffer_dirty(bhs[n]); | |
1174 | if (!size) | |
1175 | break; | |
1176 | n++; | |
1177 | blknr++; | |
1178 | } | |
1179 | } while (++i < *nr_cluster); | |
1180 | ||
1181 | memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); | |
1182 | offset = copy - sizeof(struct msdos_dir_entry); | |
1183 | get_bh(bhs[n]); | |
1184 | *bh = bhs[n]; | |
1185 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
1186 | *i_pos = fat_make_i_pos(sb, *bh, *de); | |
1187 | ||
1188 | /* Second stage: clear the rest of cluster, and write outs */ | |
1189 | err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); | |
1190 | if (err) | |
1191 | goto error_free; | |
1192 | ||
1193 | return cluster[0]; | |
1194 | ||
1195 | error_free: | |
1196 | brelse(*bh); | |
1197 | *bh = NULL; | |
1198 | n = 0; | |
1199 | error_nomem: | |
1200 | for (i = 0; i < n; i++) | |
1201 | bforget(bhs[i]); | |
1202 | fat_free_clusters(dir, cluster[0]); | |
1203 | error: | |
1204 | return err; | |
1205 | } | |
1206 | ||
1207 | int fat_add_entries(struct inode *dir, void *slots, int nr_slots, | |
1208 | struct fat_slot_info *sinfo) | |
1209 | { | |
1210 | struct super_block *sb = dir->i_sb; | |
1211 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1212 | struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ | |
1213 | struct msdos_dir_entry *de; | |
1214 | int err, free_slots, i, nr_bhs; | |
1215 | loff_t pos, i_pos; | |
1216 | ||
1217 | sinfo->nr_slots = nr_slots; | |
1218 | ||
1219 | /* First stage: search free direcotry entries */ | |
1220 | free_slots = nr_bhs = 0; | |
1221 | bh = prev = NULL; | |
1222 | pos = 0; | |
1223 | err = -ENOSPC; | |
1224 | while (fat_get_entry(dir, &pos, &bh, &de) > -1) { | |
1225 | /* check the maximum size of directory */ | |
1226 | if (pos >= FAT_MAX_DIR_SIZE) | |
1227 | goto error; | |
1228 | ||
1229 | if (IS_FREE(de->name)) { | |
1230 | if (prev != bh) { | |
1231 | get_bh(bh); | |
1232 | bhs[nr_bhs] = prev = bh; | |
1233 | nr_bhs++; | |
1234 | } | |
1235 | free_slots++; | |
1236 | if (free_slots == nr_slots) | |
1237 | goto found; | |
1238 | } else { | |
1239 | for (i = 0; i < nr_bhs; i++) | |
1240 | brelse(bhs[i]); | |
1241 | prev = NULL; | |
1242 | free_slots = nr_bhs = 0; | |
1243 | } | |
1244 | } | |
1245 | if (dir->i_ino == MSDOS_ROOT_INO) { | |
1246 | if (sbi->fat_bits != 32) | |
1247 | goto error; | |
1248 | } else if (MSDOS_I(dir)->i_start == 0) { | |
1249 | printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n", | |
1250 | MSDOS_I(dir)->i_pos); | |
1251 | err = -EIO; | |
1252 | goto error; | |
1253 | } | |
1254 | ||
1255 | found: | |
1256 | err = 0; | |
1257 | pos -= free_slots * sizeof(*de); | |
1258 | nr_slots -= free_slots; | |
1259 | if (free_slots) { | |
1260 | /* | |
1261 | * Second stage: filling the free entries with new entries. | |
1262 | * NOTE: If this slots has shortname, first, we write | |
1263 | * the long name slots, then write the short name. | |
1264 | */ | |
1265 | int size = free_slots * sizeof(*de); | |
1266 | int offset = pos & (sb->s_blocksize - 1); | |
1267 | int long_bhs = nr_bhs - (nr_slots == 0); | |
1268 | ||
1269 | /* Fill the long name slots. */ | |
1270 | for (i = 0; i < long_bhs; i++) { | |
1271 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1272 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
1273 | mark_buffer_dirty(bhs[i]); | |
1274 | offset = 0; | |
1275 | slots += copy; | |
1276 | size -= copy; | |
1277 | } | |
1278 | if (long_bhs && IS_DIRSYNC(dir)) | |
1279 | err = fat_sync_bhs(bhs, long_bhs); | |
1280 | if (!err && i < nr_bhs) { | |
1281 | /* Fill the short name slot. */ | |
1282 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1283 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
1284 | mark_buffer_dirty(bhs[i]); | |
1285 | if (IS_DIRSYNC(dir)) | |
1286 | err = sync_dirty_buffer(bhs[i]); | |
1287 | } | |
1288 | for (i = 0; i < nr_bhs; i++) | |
1289 | brelse(bhs[i]); | |
1290 | if (err) | |
1291 | goto error_remove; | |
1292 | } | |
1293 | ||
1294 | if (nr_slots) { | |
1295 | int cluster, nr_cluster; | |
1296 | ||
1297 | /* | |
1298 | * Third stage: allocate the cluster for new entries. | |
1299 | * And initialize the cluster with new entries, then | |
1300 | * add the cluster to dir. | |
1301 | */ | |
1302 | cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, | |
1303 | &de, &bh, &i_pos); | |
1304 | if (cluster < 0) { | |
1305 | err = cluster; | |
1306 | goto error_remove; | |
1307 | } | |
1308 | err = fat_chain_add(dir, cluster, nr_cluster); | |
1309 | if (err) { | |
1310 | fat_free_clusters(dir, cluster); | |
1311 | goto error_remove; | |
1312 | } | |
1313 | if (dir->i_size & (sbi->cluster_size - 1)) { | |
1314 | fat_fs_panic(sb, "Odd directory size"); | |
1315 | dir->i_size = (dir->i_size + sbi->cluster_size - 1) | |
1316 | & ~((loff_t)sbi->cluster_size - 1); | |
1317 | } | |
1318 | dir->i_size += nr_cluster << sbi->cluster_bits; | |
1319 | MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; | |
1320 | } | |
1321 | sinfo->slot_off = pos; | |
1322 | sinfo->de = de; | |
1323 | sinfo->bh = bh; | |
1324 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
1325 | ||
1326 | return 0; | |
1327 | ||
1328 | error: | |
1329 | brelse(bh); | |
1330 | for (i = 0; i < nr_bhs; i++) | |
1331 | brelse(bhs[i]); | |
1332 | return err; | |
1333 | ||
1334 | error_remove: | |
1335 | brelse(bh); | |
1336 | if (free_slots) | |
1337 | __fat_remove_entries(dir, pos, free_slots); | |
1338 | return err; | |
1339 | } | |
1340 | ||
7c709d00 | 1341 | EXPORT_SYMBOL_GPL(fat_add_entries); |