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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 | ||
1da177e4 | 16 | #include <linux/slab.h> |
188f83df | 17 | #include <linux/compat.h> |
f08b4988 | 18 | #include <linux/uaccess.h> |
2489dbab | 19 | #include <linux/iversion.h> |
9e975dae | 20 | #include "fat.h" |
1da177e4 | 21 | |
74675a58 AS |
22 | /* |
23 | * Maximum buffer size of short name. | |
24 | * [(MSDOS_NAME + '.') * max one char + nul] | |
25 | * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] | |
26 | */ | |
27 | #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) | |
28 | /* | |
29 | * Maximum buffer size of unicode chars from slots. | |
30 | * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] | |
31 | */ | |
32 | #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) | |
33 | #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) | |
34 | ||
deb8274a SM |
35 | static inline unsigned char fat_tolower(unsigned char c) |
36 | { | |
37 | return ((c >= 'A') && (c <= 'Z')) ? c+32 : c; | |
38 | } | |
39 | ||
1da177e4 LT |
40 | static inline loff_t fat_make_i_pos(struct super_block *sb, |
41 | struct buffer_head *bh, | |
42 | struct msdos_dir_entry *de) | |
43 | { | |
44 | return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) | |
45 | | (de - (struct msdos_dir_entry *)bh->b_data); | |
46 | } | |
47 | ||
f3ef6f63 KW |
48 | static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, |
49 | sector_t phys) | |
50 | { | |
51 | struct super_block *sb = dir->i_sb; | |
52 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
53 | struct buffer_head *bh; | |
54 | int sec; | |
55 | ||
56 | /* This is not a first sector of cluster, or sec_per_clus == 1 */ | |
57 | if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) | |
58 | return; | |
59 | /* root dir of FAT12/FAT16 */ | |
306790f7 | 60 | if (!is_fat32(sbi) && (dir->i_ino == MSDOS_ROOT_INO)) |
f3ef6f63 KW |
61 | return; |
62 | ||
83b7c996 OH |
63 | bh = sb_find_get_block(sb, phys); |
64 | if (bh == NULL || !buffer_uptodate(bh)) { | |
f3ef6f63 KW |
65 | for (sec = 0; sec < sbi->sec_per_clus; sec++) |
66 | sb_breadahead(sb, phys + sec); | |
67 | } | |
68 | brelse(bh); | |
69 | } | |
70 | ||
1da177e4 LT |
71 | /* Returns the inode number of the directory entry at offset pos. If bh is |
72 | non-NULL, it is brelse'd before. Pos is incremented. The buffer header is | |
73 | returned in bh. | |
74 | AV. Most often we do it item-by-item. Makes sense to optimize. | |
75 | AV. OK, there we go: if both bh and de are non-NULL we assume that we just | |
76 | AV. want the next entry (took one explicit de=NULL in vfat/namei.c). | |
77 | AV. It's done in fat_get_entry() (inlined), here the slow case lives. | |
78 | AV. Additionally, when we return -1 (i.e. reached the end of directory) | |
79 | AV. we make bh NULL. | |
80 | */ | |
81 | static int fat__get_entry(struct inode *dir, loff_t *pos, | |
82 | struct buffer_head **bh, struct msdos_dir_entry **de) | |
83 | { | |
84 | struct super_block *sb = dir->i_sb; | |
85 | sector_t phys, iblock; | |
e5174baa OH |
86 | unsigned long mapped_blocks; |
87 | int err, offset; | |
1da177e4 LT |
88 | |
89 | next: | |
90 | if (*bh) | |
91 | brelse(*bh); | |
92 | ||
93 | *bh = NULL; | |
94 | iblock = *pos >> sb->s_blocksize_bits; | |
16fab201 | 95 | err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0, false); |
1da177e4 LT |
96 | if (err || !phys) |
97 | return -1; /* beyond EOF or error */ | |
98 | ||
f3ef6f63 KW |
99 | fat_dir_readahead(dir, iblock, phys); |
100 | ||
1da177e4 LT |
101 | *bh = sb_bread(sb, phys); |
102 | if (*bh == NULL) { | |
f0aac616 NJ |
103 | fat_msg_ratelimit(sb, KERN_ERR, |
104 | "Directory bread(block %llu) failed", (llu)phys); | |
1da177e4 LT |
105 | /* skip this block */ |
106 | *pos = (iblock + 1) << sb->s_blocksize_bits; | |
107 | goto next; | |
108 | } | |
109 | ||
110 | offset = *pos & (sb->s_blocksize - 1); | |
111 | *pos += sizeof(struct msdos_dir_entry); | |
112 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static inline int fat_get_entry(struct inode *dir, loff_t *pos, | |
118 | struct buffer_head **bh, | |
119 | struct msdos_dir_entry **de) | |
120 | { | |
121 | /* Fast stuff first */ | |
122 | if (*bh && *de && | |
f08b4988 CJB |
123 | (*de - (struct msdos_dir_entry *)(*bh)->b_data) < |
124 | MSDOS_SB(dir->i_sb)->dir_per_block - 1) { | |
1da177e4 LT |
125 | *pos += sizeof(struct msdos_dir_entry); |
126 | (*de)++; | |
127 | return 0; | |
128 | } | |
129 | return fat__get_entry(dir, pos, bh, de); | |
130 | } | |
131 | ||
132 | /* | |
4de151d8 | 133 | * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. |
1da177e4 LT |
134 | * If uni_xlate is enabled and we can't get a 1:1 conversion, use a |
135 | * colon as an escape character since it is normally invalid on the vfat | |
136 | * filesystem. The following four characters are the hexadecimal digits | |
137 | * of Unicode value. This lets us do a full dump and restore of Unicode | |
138 | * filenames. We could get into some trouble with long Unicode names, | |
139 | * but ignore that right now. | |
140 | * Ahem... Stack smashing in ring 0 isn't fun. Fixed. | |
141 | */ | |
869f58c0 OR |
142 | static int uni16_to_x8(struct super_block *sb, unsigned char *ascii, |
143 | const wchar_t *uni, int len, struct nls_table *nls) | |
1da177e4 | 144 | { |
869f58c0 | 145 | int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate; |
d6886116 OH |
146 | const wchar_t *ip; |
147 | wchar_t ec; | |
3ed3dec1 | 148 | unsigned char *op; |
1da177e4 | 149 | int charlen; |
1da177e4 LT |
150 | |
151 | ip = uni; | |
152 | op = ascii; | |
153 | ||
f22032ba | 154 | while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { |
1da177e4 | 155 | ec = *ip++; |
f08b4988 CJB |
156 | charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE); |
157 | if (charlen > 0) { | |
1da177e4 | 158 | op += charlen; |
f22032ba | 159 | len -= charlen; |
1da177e4 LT |
160 | } else { |
161 | if (uni_xlate == 1) { | |
3ed3dec1 | 162 | *op++ = ':'; |
0a90e0f1 AS |
163 | op = hex_byte_pack(op, ec >> 8); |
164 | op = hex_byte_pack(op, ec); | |
f22032ba | 165 | len -= 5; |
1da177e4 LT |
166 | } else { |
167 | *op++ = '?'; | |
f22032ba | 168 | len--; |
1da177e4 LT |
169 | } |
170 | } | |
1da177e4 | 171 | } |
f22032ba KM |
172 | |
173 | if (unlikely(*ip)) { | |
f08b4988 CJB |
174 | fat_msg(sb, KERN_WARNING, |
175 | "filename was truncated while converting."); | |
f22032ba KM |
176 | } |
177 | ||
1da177e4 | 178 | *op = 0; |
f08b4988 | 179 | return op - ascii; |
1da177e4 LT |
180 | } |
181 | ||
869f58c0 | 182 | static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni, |
d6886116 OH |
183 | unsigned char *buf, int size) |
184 | { | |
869f58c0 | 185 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
d6886116 | 186 | if (sbi->options.utf8) |
74675a58 AS |
187 | return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS, |
188 | UTF16_HOST_ENDIAN, buf, size); | |
d6886116 | 189 | else |
869f58c0 | 190 | return uni16_to_x8(sb, buf, uni, size, sbi->nls_io); |
d6886116 OH |
191 | } |
192 | ||
1da177e4 LT |
193 | static inline int |
194 | fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) | |
195 | { | |
196 | int charlen; | |
197 | ||
198 | charlen = t->char2uni(c, clen, uni); | |
199 | if (charlen < 0) { | |
200 | *uni = 0x003f; /* a question mark */ | |
201 | charlen = 1; | |
202 | } | |
203 | return charlen; | |
204 | } | |
205 | ||
206 | static inline int | |
f08b4988 CJB |
207 | fat_short2lower_uni(struct nls_table *t, unsigned char *c, |
208 | int clen, wchar_t *uni) | |
1da177e4 LT |
209 | { |
210 | int charlen; | |
211 | wchar_t wc; | |
212 | ||
213 | charlen = t->char2uni(c, clen, &wc); | |
214 | if (charlen < 0) { | |
215 | *uni = 0x003f; /* a question mark */ | |
216 | charlen = 1; | |
217 | } else if (charlen <= 1) { | |
218 | unsigned char nc = t->charset2lower[*c]; | |
219 | ||
220 | if (!nc) | |
221 | nc = *c; | |
222 | ||
f08b4988 CJB |
223 | charlen = t->char2uni(&nc, 1, uni); |
224 | if (charlen < 0) { | |
1da177e4 LT |
225 | *uni = 0x003f; /* a question mark */ |
226 | charlen = 1; | |
227 | } | |
228 | } else | |
229 | *uni = wc; | |
230 | ||
231 | return charlen; | |
232 | } | |
233 | ||
234 | static inline int | |
235 | fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, | |
236 | wchar_t *uni_buf, unsigned short opt, int lower) | |
237 | { | |
238 | int len = 0; | |
239 | ||
240 | if (opt & VFAT_SFN_DISPLAY_LOWER) | |
241 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
242 | else if (opt & VFAT_SFN_DISPLAY_WIN95) | |
243 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
244 | else if (opt & VFAT_SFN_DISPLAY_WINNT) { | |
245 | if (lower) | |
246 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
247 | else | |
248 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
249 | } else | |
250 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
251 | ||
252 | return len; | |
253 | } | |
254 | ||
d6886116 OH |
255 | static inline int fat_name_match(struct msdos_sb_info *sbi, |
256 | const unsigned char *a, int a_len, | |
257 | const unsigned char *b, int b_len) | |
258 | { | |
259 | if (a_len != b_len) | |
260 | return 0; | |
261 | ||
262 | if (sbi->options.name_check != 's') | |
263 | return !nls_strnicmp(sbi->nls_io, a, b, a_len); | |
264 | else | |
265 | return !memcmp(a, b, a_len); | |
266 | } | |
267 | ||
ad2c1604 PE |
268 | enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; |
269 | ||
270 | /** | |
271 | * fat_parse_long - Parse extended directory entry. | |
272 | * | |
273 | * This function returns zero on success, negative value on error, or one of | |
274 | * the following: | |
275 | * | |
276 | * %PARSE_INVALID - Directory entry is invalid. | |
277 | * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. | |
278 | * %PARSE_EOF - Directory has no more entries. | |
279 | */ | |
280 | static int fat_parse_long(struct inode *dir, loff_t *pos, | |
281 | struct buffer_head **bh, struct msdos_dir_entry **de, | |
282 | wchar_t **unicode, unsigned char *nr_slots) | |
283 | { | |
284 | struct msdos_dir_slot *ds; | |
285 | unsigned char id, slot, slots, alias_checksum; | |
286 | ||
287 | if (!*unicode) { | |
c7a6c4ed | 288 | *unicode = __getname(); |
ad2c1604 PE |
289 | if (!*unicode) { |
290 | brelse(*bh); | |
291 | return -ENOMEM; | |
292 | } | |
293 | } | |
294 | parse_long: | |
ad2c1604 PE |
295 | ds = (struct msdos_dir_slot *)*de; |
296 | id = ds->id; | |
297 | if (!(id & 0x40)) | |
298 | return PARSE_INVALID; | |
299 | slots = id & ~0x40; | |
300 | if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ | |
301 | return PARSE_INVALID; | |
302 | *nr_slots = slots; | |
303 | alias_checksum = ds->alias_checksum; | |
304 | ||
305 | slot = slots; | |
306 | while (1) { | |
307 | int offset; | |
308 | ||
309 | slot--; | |
310 | offset = slot * 13; | |
311 | fat16_towchar(*unicode + offset, ds->name0_4, 5); | |
312 | fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); | |
313 | fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); | |
314 | ||
315 | if (ds->id & 0x40) | |
316 | (*unicode)[offset + 13] = 0; | |
317 | if (fat_get_entry(dir, pos, bh, de) < 0) | |
318 | return PARSE_EOF; | |
319 | if (slot == 0) | |
320 | break; | |
321 | ds = (struct msdos_dir_slot *)*de; | |
322 | if (ds->attr != ATTR_EXT) | |
323 | return PARSE_NOT_LONGNAME; | |
324 | if ((ds->id & ~0x40) != slot) | |
325 | goto parse_long; | |
326 | if (ds->alias_checksum != alias_checksum) | |
327 | goto parse_long; | |
328 | } | |
329 | if ((*de)->name[0] == DELETED_FLAG) | |
330 | return PARSE_INVALID; | |
331 | if ((*de)->attr == ATTR_EXT) | |
332 | goto parse_long; | |
333 | if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) | |
334 | return PARSE_INVALID; | |
335 | if (fat_checksum((*de)->name) != alias_checksum) | |
336 | *nr_slots = 0; | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
deb8274a SM |
341 | /** |
342 | * fat_parse_short - Parse MS-DOS (short) directory entry. | |
343 | * @sb: superblock | |
344 | * @de: directory entry to parse | |
345 | * @name: FAT_MAX_SHORT_SIZE array in which to place extracted name | |
346 | * @dot_hidden: Nonzero == prepend '.' to names with ATTR_HIDDEN | |
347 | * | |
348 | * Returns the number of characters extracted into 'name'. | |
349 | */ | |
350 | static int fat_parse_short(struct super_block *sb, | |
351 | const struct msdos_dir_entry *de, | |
352 | unsigned char *name, int dot_hidden) | |
353 | { | |
354 | const struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
355 | int isvfat = sbi->options.isvfat; | |
356 | int nocase = sbi->options.nocase; | |
357 | unsigned short opt_shortname = sbi->options.shortname; | |
358 | struct nls_table *nls_disk = sbi->nls_disk; | |
359 | wchar_t uni_name[14]; | |
360 | unsigned char c, work[MSDOS_NAME]; | |
361 | unsigned char *ptname = name; | |
362 | int chi, chl, i, j, k; | |
363 | int dotoffset = 0; | |
364 | int name_len = 0, uni_len = 0; | |
365 | ||
366 | if (!isvfat && dot_hidden && (de->attr & ATTR_HIDDEN)) { | |
367 | *ptname++ = '.'; | |
368 | dotoffset = 1; | |
369 | } | |
370 | ||
371 | memcpy(work, de->name, sizeof(work)); | |
eceb8902 MM |
372 | /* For an explanation of the special treatment of 0x05 in |
373 | * filenames, see msdos_format_name in namei_msdos.c | |
374 | */ | |
deb8274a SM |
375 | if (work[0] == 0x05) |
376 | work[0] = 0xE5; | |
377 | ||
378 | /* Filename */ | |
379 | for (i = 0, j = 0; i < 8;) { | |
380 | c = work[i]; | |
381 | if (!c) | |
382 | break; | |
383 | chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, | |
384 | &uni_name[j++], opt_shortname, | |
385 | de->lcase & CASE_LOWER_BASE); | |
386 | if (chl <= 1) { | |
387 | if (!isvfat) | |
388 | ptname[i] = nocase ? c : fat_tolower(c); | |
389 | i++; | |
390 | if (c != ' ') { | |
391 | name_len = i; | |
392 | uni_len = j; | |
393 | } | |
394 | } else { | |
395 | uni_len = j; | |
396 | if (isvfat) | |
397 | i += min(chl, 8-i); | |
398 | else { | |
399 | for (chi = 0; chi < chl && i < 8; chi++, i++) | |
400 | ptname[i] = work[i]; | |
401 | } | |
402 | if (chl) | |
403 | name_len = i; | |
404 | } | |
405 | } | |
406 | ||
407 | i = name_len; | |
408 | j = uni_len; | |
409 | fat_short2uni(nls_disk, ".", 1, &uni_name[j++]); | |
410 | if (!isvfat) | |
411 | ptname[i] = '.'; | |
412 | i++; | |
413 | ||
414 | /* Extension */ | |
415 | for (k = 8; k < MSDOS_NAME;) { | |
416 | c = work[k]; | |
417 | if (!c) | |
418 | break; | |
419 | chl = fat_shortname2uni(nls_disk, &work[k], MSDOS_NAME - k, | |
420 | &uni_name[j++], opt_shortname, | |
421 | de->lcase & CASE_LOWER_EXT); | |
422 | if (chl <= 1) { | |
423 | k++; | |
424 | if (!isvfat) | |
425 | ptname[i] = nocase ? c : fat_tolower(c); | |
426 | i++; | |
427 | if (c != ' ') { | |
428 | name_len = i; | |
429 | uni_len = j; | |
430 | } | |
431 | } else { | |
432 | uni_len = j; | |
433 | if (isvfat) { | |
434 | int offset = min(chl, MSDOS_NAME-k); | |
435 | k += offset; | |
436 | i += offset; | |
437 | } else { | |
438 | for (chi = 0; chi < chl && k < MSDOS_NAME; | |
439 | chi++, i++, k++) { | |
440 | ptname[i] = work[k]; | |
441 | } | |
442 | } | |
443 | if (chl) | |
444 | name_len = i; | |
445 | } | |
446 | } | |
447 | ||
448 | if (name_len > 0) { | |
449 | name_len += dotoffset; | |
450 | ||
451 | if (sbi->options.isvfat) { | |
452 | uni_name[uni_len] = 0x0000; | |
453 | name_len = fat_uni_to_x8(sb, uni_name, name, | |
454 | FAT_MAX_SHORT_SIZE); | |
455 | } | |
456 | } | |
457 | ||
458 | return name_len; | |
459 | } | |
460 | ||
1da177e4 | 461 | /* |
c39540c6 | 462 | * Return values: negative -> error/not found, 0 -> found. |
1da177e4 LT |
463 | */ |
464 | int fat_search_long(struct inode *inode, const unsigned char *name, | |
465 | int name_len, struct fat_slot_info *sinfo) | |
466 | { | |
467 | struct super_block *sb = inode->i_sb; | |
468 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
469 | struct buffer_head *bh = NULL; | |
470 | struct msdos_dir_entry *de; | |
f22032ba | 471 | unsigned char nr_slots; |
1da177e4 | 472 | wchar_t *unicode = NULL; |
98a15160 | 473 | unsigned char bufname[FAT_MAX_SHORT_SIZE]; |
1da177e4 | 474 | loff_t cpos = 0; |
deb8274a | 475 | int err, len; |
1da177e4 LT |
476 | |
477 | err = -ENOENT; | |
d6886116 | 478 | while (1) { |
1da177e4 | 479 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
d6886116 | 480 | goto end_of_dir; |
1da177e4 LT |
481 | parse_record: |
482 | nr_slots = 0; | |
483 | if (de->name[0] == DELETED_FLAG) | |
484 | continue; | |
485 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) | |
486 | continue; | |
487 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) | |
488 | continue; | |
489 | if (de->attr == ATTR_EXT) { | |
ad2c1604 PE |
490 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
491 | &unicode, &nr_slots); | |
52e9d9f4 DJ |
492 | if (status < 0) { |
493 | err = status; | |
494 | goto end_of_dir; | |
495 | } else if (status == PARSE_INVALID) | |
1da177e4 | 496 | continue; |
ad2c1604 PE |
497 | else if (status == PARSE_NOT_LONGNAME) |
498 | goto parse_record; | |
499 | else if (status == PARSE_EOF) | |
d6886116 | 500 | goto end_of_dir; |
1da177e4 LT |
501 | } |
502 | ||
deb8274a SM |
503 | /* Never prepend '.' to hidden files here. |
504 | * That is done only for msdos mounts (and only when | |
505 | * 'dotsOK=yes'); if we are executing here, it is in the | |
506 | * context of a vfat mount. | |
507 | */ | |
508 | len = fat_parse_short(sb, de, bufname, 0); | |
509 | if (len == 0) | |
1da177e4 LT |
510 | continue; |
511 | ||
d6886116 | 512 | /* Compare shortname */ |
d6886116 OH |
513 | if (fat_name_match(sbi, name, name_len, bufname, len)) |
514 | goto found; | |
1da177e4 LT |
515 | |
516 | if (nr_slots) { | |
98a15160 OH |
517 | void *longname = unicode + FAT_MAX_UNI_CHARS; |
518 | int size = PATH_MAX - FAT_MAX_UNI_SIZE; | |
519 | ||
d6886116 | 520 | /* Compare longname */ |
869f58c0 | 521 | len = fat_uni_to_x8(sb, unicode, longname, size); |
98a15160 | 522 | if (fat_name_match(sbi, name, name_len, longname, len)) |
d6886116 | 523 | goto found; |
1da177e4 LT |
524 | } |
525 | } | |
526 | ||
d6886116 | 527 | found: |
1da177e4 LT |
528 | nr_slots++; /* include the de */ |
529 | sinfo->slot_off = cpos - nr_slots * sizeof(*de); | |
530 | sinfo->nr_slots = nr_slots; | |
531 | sinfo->de = de; | |
532 | sinfo->bh = bh; | |
533 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
534 | err = 0; | |
d6886116 | 535 | end_of_dir: |
1da177e4 | 536 | if (unicode) |
c7a6c4ed | 537 | __putname(unicode); |
1da177e4 LT |
538 | |
539 | return err; | |
540 | } | |
7c709d00 | 541 | EXPORT_SYMBOL_GPL(fat_search_long); |
1da177e4 LT |
542 | |
543 | struct fat_ioctl_filldir_callback { | |
2c6a2473 | 544 | struct dir_context ctx; |
c483bab0 | 545 | void __user *dirent; |
1da177e4 LT |
546 | int result; |
547 | /* for dir ioctl */ | |
548 | const char *longname; | |
549 | int long_len; | |
550 | const char *shortname; | |
551 | int short_len; | |
552 | }; | |
553 | ||
2c6a2473 AV |
554 | static int __fat_readdir(struct inode *inode, struct file *file, |
555 | struct dir_context *ctx, int short_only, | |
556 | struct fat_ioctl_filldir_callback *both) | |
1da177e4 LT |
557 | { |
558 | struct super_block *sb = inode->i_sb; | |
559 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
560 | struct buffer_head *bh; | |
561 | struct msdos_dir_entry *de; | |
d6886116 | 562 | unsigned char nr_slots; |
1da177e4 | 563 | wchar_t *unicode = NULL; |
deb8274a | 564 | unsigned char bufname[FAT_MAX_SHORT_SIZE]; |
1da177e4 | 565 | int isvfat = sbi->options.isvfat; |
dcd8c53f | 566 | const char *fill_name = NULL; |
2c6a2473 | 567 | int fake_offset = 0; |
1da177e4 | 568 | loff_t cpos; |
deb8274a | 569 | int short_len = 0, fill_len = 0; |
1da177e4 LT |
570 | int ret = 0; |
571 | ||
e40b34c7 | 572 | mutex_lock(&sbi->s_lock); |
1da177e4 | 573 | |
2c6a2473 | 574 | cpos = ctx->pos; |
1da177e4 LT |
575 | /* Fake . and .. for the root directory. */ |
576 | if (inode->i_ino == MSDOS_ROOT_INO) { | |
2c6a2473 AV |
577 | if (!dir_emit_dots(file, ctx)) |
578 | goto out; | |
579 | if (ctx->pos == 2) { | |
580 | fake_offset = 1; | |
1da177e4 LT |
581 | cpos = 0; |
582 | } | |
583 | } | |
d6886116 | 584 | if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { |
1da177e4 LT |
585 | ret = -ENOENT; |
586 | goto out; | |
587 | } | |
588 | ||
589 | bh = NULL; | |
d6886116 | 590 | get_new: |
1da177e4 | 591 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
d6886116 | 592 | goto end_of_dir; |
ad2c1604 | 593 | parse_record: |
d6886116 | 594 | nr_slots = 0; |
dcd8c53f OH |
595 | /* |
596 | * Check for long filename entry, but if short_only, we don't | |
597 | * need to parse long filename. | |
598 | */ | |
599 | if (isvfat && !short_only) { | |
1da177e4 | 600 | if (de->name[0] == DELETED_FLAG) |
d6886116 | 601 | goto record_end; |
1da177e4 | 602 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) |
d6886116 | 603 | goto record_end; |
1da177e4 | 604 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) |
d6886116 | 605 | goto record_end; |
1da177e4 LT |
606 | } else { |
607 | if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) | |
d6886116 | 608 | goto record_end; |
1da177e4 LT |
609 | } |
610 | ||
611 | if (isvfat && de->attr == ATTR_EXT) { | |
ad2c1604 | 612 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
d6886116 | 613 | &unicode, &nr_slots); |
ad2c1604 | 614 | if (status < 0) { |
928a4771 | 615 | bh = NULL; |
ad2c1604 | 616 | ret = status; |
928a4771 | 617 | goto end_of_dir; |
ad2c1604 | 618 | } else if (status == PARSE_INVALID) |
d6886116 | 619 | goto record_end; |
ad2c1604 PE |
620 | else if (status == PARSE_NOT_LONGNAME) |
621 | goto parse_record; | |
622 | else if (status == PARSE_EOF) | |
d6886116 | 623 | goto end_of_dir; |
dcd8c53f OH |
624 | |
625 | if (nr_slots) { | |
626 | void *longname = unicode + FAT_MAX_UNI_CHARS; | |
627 | int size = PATH_MAX - FAT_MAX_UNI_SIZE; | |
869f58c0 | 628 | int len = fat_uni_to_x8(sb, unicode, longname, size); |
dcd8c53f OH |
629 | |
630 | fill_name = longname; | |
631 | fill_len = len; | |
632 | /* !both && !short_only, so we don't need shortname. */ | |
633 | if (!both) | |
634 | goto start_filldir; | |
2c6a2473 AV |
635 | |
636 | short_len = fat_parse_short(sb, de, bufname, | |
637 | sbi->options.dotsOK); | |
638 | if (short_len == 0) | |
639 | goto record_end; | |
640 | /* hack for fat_ioctl_filldir() */ | |
641 | both->longname = fill_name; | |
642 | both->long_len = fill_len; | |
643 | both->shortname = bufname; | |
644 | both->short_len = short_len; | |
645 | fill_name = NULL; | |
646 | fill_len = 0; | |
647 | goto start_filldir; | |
dcd8c53f | 648 | } |
1da177e4 LT |
649 | } |
650 | ||
deb8274a SM |
651 | short_len = fat_parse_short(sb, de, bufname, sbi->options.dotsOK); |
652 | if (short_len == 0) | |
d6886116 | 653 | goto record_end; |
1da177e4 | 654 | |
2c6a2473 AV |
655 | fill_name = bufname; |
656 | fill_len = short_len; | |
dcd8c53f OH |
657 | |
658 | start_filldir: | |
928a4771 OH |
659 | ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); |
660 | if (fake_offset && ctx->pos < 2) | |
661 | ctx->pos = 2; | |
2c6a2473 AV |
662 | |
663 | if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) { | |
664 | if (!dir_emit_dot(file, ctx)) | |
665 | goto fill_failed; | |
666 | } else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
667 | if (!dir_emit_dotdot(file, ctx)) | |
668 | goto fill_failed; | |
1da177e4 | 669 | } else { |
2c6a2473 | 670 | unsigned long inum; |
1da177e4 LT |
671 | loff_t i_pos = fat_make_i_pos(sb, bh, de); |
672 | struct inode *tmp = fat_iget(sb, i_pos); | |
673 | if (tmp) { | |
674 | inum = tmp->i_ino; | |
675 | iput(tmp); | |
676 | } else | |
677 | inum = iunique(sb, MSDOS_ROOT_INO); | |
2c6a2473 AV |
678 | if (!dir_emit(ctx, fill_name, fill_len, inum, |
679 | (de->attr & ATTR_DIR) ? DT_DIR : DT_REG)) | |
680 | goto fill_failed; | |
1da177e4 LT |
681 | } |
682 | ||
d6886116 | 683 | record_end: |
2c6a2473 AV |
684 | fake_offset = 0; |
685 | ctx->pos = cpos; | |
d6886116 | 686 | goto get_new; |
928a4771 | 687 | |
d6886116 | 688 | end_of_dir: |
928a4771 OH |
689 | if (fake_offset && cpos < 2) |
690 | ctx->pos = 2; | |
691 | else | |
692 | ctx->pos = cpos; | |
d6886116 | 693 | fill_failed: |
f3ef6f63 | 694 | brelse(bh); |
1da177e4 | 695 | if (unicode) |
c7a6c4ed | 696 | __putname(unicode); |
1da177e4 | 697 | out: |
e40b34c7 | 698 | mutex_unlock(&sbi->s_lock); |
928a4771 | 699 | |
1da177e4 LT |
700 | return ret; |
701 | } | |
702 | ||
2c6a2473 | 703 | static int fat_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 704 | { |
2c6a2473 | 705 | return __fat_readdir(file_inode(file), file, ctx, 0, NULL); |
1da177e4 LT |
706 | } |
707 | ||
c483bab0 | 708 | #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ |
ac7576f4 | 709 | static int func(struct dir_context *ctx, const char *name, int name_len, \ |
c483bab0 OH |
710 | loff_t offset, u64 ino, unsigned int d_type) \ |
711 | { \ | |
ac7576f4 MS |
712 | struct fat_ioctl_filldir_callback *buf = \ |
713 | container_of(ctx, struct fat_ioctl_filldir_callback, ctx); \ | |
c483bab0 OH |
714 | struct dirent_type __user *d1 = buf->dirent; \ |
715 | struct dirent_type __user *d2 = d1 + 1; \ | |
716 | \ | |
717 | if (buf->result) \ | |
718 | return -EINVAL; \ | |
719 | buf->result++; \ | |
720 | \ | |
721 | if (name != NULL) { \ | |
722 | /* dirent has only short name */ \ | |
723 | if (name_len >= sizeof(d1->d_name)) \ | |
724 | name_len = sizeof(d1->d_name) - 1; \ | |
725 | \ | |
726 | if (put_user(0, d2->d_name) || \ | |
727 | put_user(0, &d2->d_reclen) || \ | |
728 | copy_to_user(d1->d_name, name, name_len) || \ | |
729 | put_user(0, d1->d_name + name_len) || \ | |
730 | put_user(name_len, &d1->d_reclen)) \ | |
731 | goto efault; \ | |
732 | } else { \ | |
733 | /* dirent has short and long name */ \ | |
734 | const char *longname = buf->longname; \ | |
735 | int long_len = buf->long_len; \ | |
736 | const char *shortname = buf->shortname; \ | |
737 | int short_len = buf->short_len; \ | |
738 | \ | |
739 | if (long_len >= sizeof(d1->d_name)) \ | |
740 | long_len = sizeof(d1->d_name) - 1; \ | |
741 | if (short_len >= sizeof(d1->d_name)) \ | |
742 | short_len = sizeof(d1->d_name) - 1; \ | |
743 | \ | |
744 | if (copy_to_user(d2->d_name, longname, long_len) || \ | |
745 | put_user(0, d2->d_name + long_len) || \ | |
746 | put_user(long_len, &d2->d_reclen) || \ | |
747 | put_user(ino, &d2->d_ino) || \ | |
748 | put_user(offset, &d2->d_off) || \ | |
749 | copy_to_user(d1->d_name, shortname, short_len) || \ | |
750 | put_user(0, d1->d_name + short_len) || \ | |
751 | put_user(short_len, &d1->d_reclen)) \ | |
752 | goto efault; \ | |
753 | } \ | |
754 | return 0; \ | |
755 | efault: \ | |
756 | buf->result = -EFAULT; \ | |
757 | return -EFAULT; \ | |
758 | } | |
759 | ||
531f710f | 760 | FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) |
c483bab0 | 761 | |
2c6a2473 | 762 | static int fat_ioctl_readdir(struct inode *inode, struct file *file, |
c483bab0 OH |
763 | void __user *dirent, filldir_t filldir, |
764 | int short_only, int both) | |
1da177e4 | 765 | { |
2c6a2473 AV |
766 | struct fat_ioctl_filldir_callback buf = { |
767 | .ctx.actor = filldir, | |
768 | .dirent = dirent | |
769 | }; | |
c483bab0 OH |
770 | int ret; |
771 | ||
772 | buf.dirent = dirent; | |
773 | buf.result = 0; | |
98d4b8d8 | 774 | inode_lock_shared(inode); |
2c6a2473 | 775 | buf.ctx.pos = file->f_pos; |
c483bab0 OH |
776 | ret = -ENOENT; |
777 | if (!IS_DEADDIR(inode)) { | |
2c6a2473 AV |
778 | ret = __fat_readdir(inode, file, &buf.ctx, |
779 | short_only, both ? &buf : NULL); | |
780 | file->f_pos = buf.ctx.pos; | |
1da177e4 | 781 | } |
98d4b8d8 | 782 | inode_unlock_shared(inode); |
c483bab0 OH |
783 | if (ret >= 0) |
784 | ret = buf.result; | |
785 | return ret; | |
1da177e4 LT |
786 | } |
787 | ||
7845bc3e AB |
788 | static long fat_dir_ioctl(struct file *filp, unsigned int cmd, |
789 | unsigned long arg) | |
1da177e4 | 790 | { |
496ad9aa | 791 | struct inode *inode = file_inode(filp); |
531f710f | 792 | struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; |
c483bab0 | 793 | int short_only, both; |
1da177e4 LT |
794 | |
795 | switch (cmd) { | |
796 | case VFAT_IOCTL_READDIR_SHORT: | |
797 | short_only = 1; | |
798 | both = 0; | |
799 | break; | |
800 | case VFAT_IOCTL_READDIR_BOTH: | |
801 | short_only = 0; | |
802 | both = 1; | |
803 | break; | |
804 | default: | |
7845bc3e | 805 | return fat_generic_ioctl(filp, cmd, arg); |
1da177e4 LT |
806 | } |
807 | ||
96d4f267 | 808 | if (!access_ok(d1, sizeof(struct __fat_dirent[2]))) |
1da177e4 LT |
809 | return -EFAULT; |
810 | /* | |
811 | * Yes, we don't need this put_user() absolutely. However old | |
812 | * code didn't return the right value. So, app use this value, | |
813 | * in order to check whether it is EOF. | |
814 | */ | |
815 | if (put_user(0, &d1->d_reclen)) | |
816 | return -EFAULT; | |
817 | ||
c483bab0 OH |
818 | return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, |
819 | short_only, both); | |
1da177e4 LT |
820 | } |
821 | ||
188f83df DH |
822 | #ifdef CONFIG_COMPAT |
823 | #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) | |
824 | #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) | |
825 | ||
c483bab0 | 826 | FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) |
188f83df | 827 | |
c483bab0 | 828 | static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, |
188f83df DH |
829 | unsigned long arg) |
830 | { | |
496ad9aa | 831 | struct inode *inode = file_inode(filp); |
c483bab0 OH |
832 | struct compat_dirent __user *d1 = compat_ptr(arg); |
833 | int short_only, both; | |
188f83df DH |
834 | |
835 | switch (cmd) { | |
188f83df | 836 | case VFAT_IOCTL_READDIR_SHORT32: |
c483bab0 OH |
837 | short_only = 1; |
838 | both = 0; | |
839 | break; | |
840 | case VFAT_IOCTL_READDIR_BOTH32: | |
841 | short_only = 0; | |
842 | both = 1; | |
188f83df DH |
843 | break; |
844 | default: | |
7845bc3e | 845 | return fat_generic_ioctl(filp, cmd, (unsigned long)arg); |
188f83df DH |
846 | } |
847 | ||
96d4f267 | 848 | if (!access_ok(d1, sizeof(struct compat_dirent[2]))) |
c483bab0 OH |
849 | return -EFAULT; |
850 | /* | |
851 | * Yes, we don't need this put_user() absolutely. However old | |
852 | * code didn't return the right value. So, app use this value, | |
853 | * in order to check whether it is EOF. | |
854 | */ | |
855 | if (put_user(0, &d1->d_reclen)) | |
856 | return -EFAULT; | |
857 | ||
858 | return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, | |
859 | short_only, both); | |
188f83df DH |
860 | } |
861 | #endif /* CONFIG_COMPAT */ | |
862 | ||
4b6f5d20 | 863 | const struct file_operations fat_dir_operations = { |
53472bc8 | 864 | .llseek = generic_file_llseek, |
1da177e4 | 865 | .read = generic_read_dir, |
98d4b8d8 | 866 | .iterate_shared = fat_readdir, |
7845bc3e | 867 | .unlocked_ioctl = fat_dir_ioctl, |
188f83df DH |
868 | #ifdef CONFIG_COMPAT |
869 | .compat_ioctl = fat_compat_dir_ioctl, | |
870 | #endif | |
b522412a | 871 | .fsync = fat_file_fsync, |
1da177e4 LT |
872 | }; |
873 | ||
874 | static int fat_get_short_entry(struct inode *dir, loff_t *pos, | |
875 | struct buffer_head **bh, | |
876 | struct msdos_dir_entry **de) | |
877 | { | |
878 | while (fat_get_entry(dir, pos, bh, de) >= 0) { | |
879 | /* free entry or long name entry or volume label */ | |
880 | if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) | |
881 | return 0; | |
882 | } | |
883 | return -ENOENT; | |
884 | } | |
885 | ||
886 | /* | |
7669e8fb SM |
887 | * The ".." entry can not provide the "struct fat_slot_info" information |
888 | * for inode, nor a usable i_pos. So, this function provides some information | |
889 | * only. | |
890 | * | |
891 | * Since this function walks through the on-disk inodes within a directory, | |
892 | * callers are responsible for taking any locks necessary to prevent the | |
893 | * directory from changing. | |
1da177e4 LT |
894 | */ |
895 | int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, | |
7669e8fb | 896 | struct msdos_dir_entry **de) |
1da177e4 | 897 | { |
7669e8fb | 898 | loff_t offset = 0; |
1da177e4 | 899 | |
7669e8fb | 900 | *de = NULL; |
1da177e4 | 901 | while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { |
7669e8fb | 902 | if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) |
1da177e4 | 903 | return 0; |
1da177e4 LT |
904 | } |
905 | return -ENOENT; | |
906 | } | |
7c709d00 | 907 | EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); |
1da177e4 LT |
908 | |
909 | /* See if directory is empty */ | |
910 | int fat_dir_empty(struct inode *dir) | |
911 | { | |
912 | struct buffer_head *bh; | |
913 | struct msdos_dir_entry *de; | |
914 | loff_t cpos; | |
915 | int result = 0; | |
916 | ||
917 | bh = NULL; | |
918 | cpos = 0; | |
919 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
920 | if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && | |
921 | strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
922 | result = -ENOTEMPTY; | |
923 | break; | |
924 | } | |
925 | } | |
926 | brelse(bh); | |
927 | return result; | |
928 | } | |
7c709d00 | 929 | EXPORT_SYMBOL_GPL(fat_dir_empty); |
1da177e4 LT |
930 | |
931 | /* | |
932 | * fat_subdirs counts the number of sub-directories of dir. It can be run | |
933 | * on directories being created. | |
934 | */ | |
935 | int fat_subdirs(struct inode *dir) | |
936 | { | |
937 | struct buffer_head *bh; | |
938 | struct msdos_dir_entry *de; | |
939 | loff_t cpos; | |
940 | int count = 0; | |
941 | ||
942 | bh = NULL; | |
943 | cpos = 0; | |
944 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
945 | if (de->attr & ATTR_DIR) | |
946 | count++; | |
947 | } | |
948 | brelse(bh); | |
949 | return count; | |
950 | } | |
951 | ||
952 | /* | |
953 | * Scans a directory for a given file (name points to its formatted name). | |
954 | * Returns an error code or zero. | |
955 | */ | |
956 | int fat_scan(struct inode *dir, const unsigned char *name, | |
957 | struct fat_slot_info *sinfo) | |
958 | { | |
959 | struct super_block *sb = dir->i_sb; | |
960 | ||
961 | sinfo->slot_off = 0; | |
962 | sinfo->bh = NULL; | |
963 | while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, | |
964 | &sinfo->de) >= 0) { | |
965 | if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { | |
966 | sinfo->slot_off -= sizeof(*sinfo->de); | |
967 | sinfo->nr_slots = 1; | |
968 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
969 | return 0; | |
970 | } | |
971 | } | |
972 | return -ENOENT; | |
973 | } | |
7c709d00 | 974 | EXPORT_SYMBOL_GPL(fat_scan); |
1da177e4 | 975 | |
f1e6fb0a NJ |
976 | /* |
977 | * Scans a directory for a given logstart. | |
978 | * Returns an error code or zero. | |
979 | */ | |
980 | int fat_scan_logstart(struct inode *dir, int i_logstart, | |
981 | struct fat_slot_info *sinfo) | |
982 | { | |
983 | struct super_block *sb = dir->i_sb; | |
984 | ||
985 | sinfo->slot_off = 0; | |
986 | sinfo->bh = NULL; | |
987 | while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, | |
988 | &sinfo->de) >= 0) { | |
989 | if (fat_get_start(MSDOS_SB(sb), sinfo->de) == i_logstart) { | |
990 | sinfo->slot_off -= sizeof(*sinfo->de); | |
991 | sinfo->nr_slots = 1; | |
992 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
993 | return 0; | |
994 | } | |
995 | } | |
996 | return -ENOENT; | |
997 | } | |
998 | ||
1da177e4 LT |
999 | static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) |
1000 | { | |
1001 | struct super_block *sb = dir->i_sb; | |
1002 | struct buffer_head *bh; | |
1003 | struct msdos_dir_entry *de, *endp; | |
1004 | int err = 0, orig_slots; | |
1005 | ||
1006 | while (nr_slots) { | |
1007 | bh = NULL; | |
1008 | if (fat_get_entry(dir, &pos, &bh, &de) < 0) { | |
1009 | err = -EIO; | |
1010 | break; | |
1011 | } | |
1012 | ||
1013 | orig_slots = nr_slots; | |
1014 | endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); | |
1015 | while (nr_slots && de < endp) { | |
1016 | de->name[0] = DELETED_FLAG; | |
1017 | de++; | |
1018 | nr_slots--; | |
1019 | } | |
b522412a | 1020 | mark_buffer_dirty_inode(bh, dir); |
1da177e4 LT |
1021 | if (IS_DIRSYNC(dir)) |
1022 | err = sync_dirty_buffer(bh); | |
1023 | brelse(bh); | |
1024 | if (err) | |
1025 | break; | |
1026 | ||
1027 | /* pos is *next* de's position, so this does `- sizeof(de)' */ | |
1028 | pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); | |
1029 | } | |
1030 | ||
1031 | return err; | |
1032 | } | |
1033 | ||
1034 | int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) | |
1035 | { | |
869f58c0 | 1036 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
1037 | struct msdos_dir_entry *de; |
1038 | struct buffer_head *bh; | |
1039 | int err = 0, nr_slots; | |
1040 | ||
1041 | /* | |
1042 | * First stage: Remove the shortname. By this, the directory | |
1043 | * entry is removed. | |
1044 | */ | |
1045 | nr_slots = sinfo->nr_slots; | |
1046 | de = sinfo->de; | |
1047 | sinfo->de = NULL; | |
1048 | bh = sinfo->bh; | |
1049 | sinfo->bh = NULL; | |
1050 | while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { | |
1051 | de->name[0] = DELETED_FLAG; | |
1052 | de--; | |
1053 | nr_slots--; | |
1054 | } | |
b522412a | 1055 | mark_buffer_dirty_inode(bh, dir); |
1da177e4 LT |
1056 | if (IS_DIRSYNC(dir)) |
1057 | err = sync_dirty_buffer(bh); | |
1058 | brelse(bh); | |
1059 | if (err) | |
1060 | return err; | |
2489dbab | 1061 | inode_inc_iversion(dir); |
1da177e4 LT |
1062 | |
1063 | if (nr_slots) { | |
1064 | /* | |
1065 | * Second stage: remove the remaining longname slots. | |
1066 | * (This directory entry is already removed, and so return | |
1067 | * the success) | |
1068 | */ | |
1069 | err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); | |
1070 | if (err) { | |
869f58c0 OR |
1071 | fat_msg(sb, KERN_WARNING, |
1072 | "Couldn't remove the long name slots"); | |
1da177e4 LT |
1073 | } |
1074 | } | |
1075 | ||
cd83f6b1 | 1076 | fat_truncate_time(dir, NULL, S_ATIME|S_MTIME); |
1da177e4 LT |
1077 | if (IS_DIRSYNC(dir)) |
1078 | (void)fat_sync_inode(dir); | |
1079 | else | |
1080 | mark_inode_dirty(dir); | |
1081 | ||
1082 | return 0; | |
1083 | } | |
7c709d00 | 1084 | EXPORT_SYMBOL_GPL(fat_remove_entries); |
1da177e4 LT |
1085 | |
1086 | static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, | |
1087 | struct buffer_head **bhs, int nr_bhs) | |
1088 | { | |
1089 | struct super_block *sb = dir->i_sb; | |
1090 | sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; | |
1091 | int err, i, n; | |
1092 | ||
1093 | /* Zeroing the unused blocks on this cluster */ | |
1094 | blknr += nr_used; | |
1095 | n = nr_used; | |
1096 | while (blknr < last_blknr) { | |
1097 | bhs[n] = sb_getblk(sb, blknr); | |
1098 | if (!bhs[n]) { | |
1099 | err = -ENOMEM; | |
1100 | goto error; | |
1101 | } | |
1102 | memset(bhs[n]->b_data, 0, sb->s_blocksize); | |
1103 | set_buffer_uptodate(bhs[n]); | |
b522412a | 1104 | mark_buffer_dirty_inode(bhs[n], dir); |
1da177e4 LT |
1105 | |
1106 | n++; | |
1107 | blknr++; | |
1108 | if (n == nr_bhs) { | |
1109 | if (IS_DIRSYNC(dir)) { | |
1110 | err = fat_sync_bhs(bhs, n); | |
1111 | if (err) | |
1112 | goto error; | |
1113 | } | |
1114 | for (i = 0; i < n; i++) | |
1115 | brelse(bhs[i]); | |
1116 | n = 0; | |
1117 | } | |
1118 | } | |
1119 | if (IS_DIRSYNC(dir)) { | |
1120 | err = fat_sync_bhs(bhs, n); | |
1121 | if (err) | |
1122 | goto error; | |
1123 | } | |
1124 | for (i = 0; i < n; i++) | |
1125 | brelse(bhs[i]); | |
1126 | ||
1127 | return 0; | |
1128 | ||
1129 | error: | |
1130 | for (i = 0; i < n; i++) | |
1131 | bforget(bhs[i]); | |
1132 | return err; | |
1133 | } | |
1134 | ||
f423420c | 1135 | int fat_alloc_new_dir(struct inode *dir, struct timespec64 *ts) |
1da177e4 LT |
1136 | { |
1137 | struct super_block *sb = dir->i_sb; | |
1138 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1139 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1140 | struct msdos_dir_entry *de; | |
1141 | sector_t blknr; | |
1142 | __le16 date, time; | |
7decd1cb | 1143 | u8 time_cs; |
1da177e4 LT |
1144 | int err, cluster; |
1145 | ||
1146 | err = fat_alloc_clusters(dir, &cluster, 1); | |
1147 | if (err) | |
1148 | goto error; | |
1149 | ||
1150 | blknr = fat_clus_to_blknr(sbi, cluster); | |
1151 | bhs[0] = sb_getblk(sb, blknr); | |
1152 | if (!bhs[0]) { | |
1153 | err = -ENOMEM; | |
1154 | goto error_free; | |
1155 | } | |
1156 | ||
7decd1cb | 1157 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
1da177e4 LT |
1158 | |
1159 | de = (struct msdos_dir_entry *)bhs[0]->b_data; | |
1160 | /* filling the new directory slots ("." and ".." entries) */ | |
1161 | memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); | |
1162 | memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); | |
1163 | de->attr = de[1].attr = ATTR_DIR; | |
1164 | de[0].lcase = de[1].lcase = 0; | |
1165 | de[0].time = de[1].time = time; | |
1166 | de[0].date = de[1].date = date; | |
1da177e4 LT |
1167 | if (sbi->options.isvfat) { |
1168 | /* extra timestamps */ | |
1169 | de[0].ctime = de[1].ctime = time; | |
7decd1cb | 1170 | de[0].ctime_cs = de[1].ctime_cs = time_cs; |
1da177e4 LT |
1171 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; |
1172 | } else { | |
1173 | de[0].ctime = de[1].ctime = 0; | |
7decd1cb | 1174 | de[0].ctime_cs = de[1].ctime_cs = 0; |
1da177e4 LT |
1175 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; |
1176 | } | |
4b637098 NJ |
1177 | fat_set_start(&de[0], cluster); |
1178 | fat_set_start(&de[1], MSDOS_I(dir)->i_logstart); | |
1da177e4 LT |
1179 | de[0].size = de[1].size = 0; |
1180 | memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); | |
1181 | set_buffer_uptodate(bhs[0]); | |
b522412a | 1182 | mark_buffer_dirty_inode(bhs[0], dir); |
1da177e4 LT |
1183 | |
1184 | err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); | |
1185 | if (err) | |
1186 | goto error_free; | |
1187 | ||
1188 | return cluster; | |
1189 | ||
1190 | error_free: | |
1191 | fat_free_clusters(dir, cluster); | |
1192 | error: | |
1193 | return err; | |
1194 | } | |
7c709d00 | 1195 | EXPORT_SYMBOL_GPL(fat_alloc_new_dir); |
1da177e4 LT |
1196 | |
1197 | static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, | |
1198 | int *nr_cluster, struct msdos_dir_entry **de, | |
1199 | struct buffer_head **bh, loff_t *i_pos) | |
1200 | { | |
1201 | struct super_block *sb = dir->i_sb; | |
1202 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1203 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1204 | sector_t blknr, start_blknr, last_blknr; | |
1205 | unsigned long size, copy; | |
1206 | int err, i, n, offset, cluster[2]; | |
1207 | ||
1208 | /* | |
1209 | * The minimum cluster size is 512bytes, and maximum entry | |
1210 | * size is 32*slots (672bytes). So, iff the cluster size is | |
1211 | * 512bytes, we may need two clusters. | |
1212 | */ | |
1213 | size = nr_slots * sizeof(struct msdos_dir_entry); | |
1214 | *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; | |
1215 | BUG_ON(*nr_cluster > 2); | |
1216 | ||
1217 | err = fat_alloc_clusters(dir, cluster, *nr_cluster); | |
1218 | if (err) | |
1219 | goto error; | |
1220 | ||
1221 | /* | |
1222 | * First stage: Fill the directory entry. NOTE: This cluster | |
1223 | * is not referenced from any inode yet, so updates order is | |
1224 | * not important. | |
1225 | */ | |
1226 | i = n = copy = 0; | |
1227 | do { | |
1228 | start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); | |
1229 | last_blknr = start_blknr + sbi->sec_per_clus; | |
1230 | while (blknr < last_blknr) { | |
1231 | bhs[n] = sb_getblk(sb, blknr); | |
1232 | if (!bhs[n]) { | |
1233 | err = -ENOMEM; | |
1234 | goto error_nomem; | |
1235 | } | |
1236 | ||
1237 | /* fill the directory entry */ | |
1238 | copy = min(size, sb->s_blocksize); | |
1239 | memcpy(bhs[n]->b_data, slots, copy); | |
1240 | slots += copy; | |
1241 | size -= copy; | |
1242 | set_buffer_uptodate(bhs[n]); | |
b522412a | 1243 | mark_buffer_dirty_inode(bhs[n], dir); |
1da177e4 LT |
1244 | if (!size) |
1245 | break; | |
1246 | n++; | |
1247 | blknr++; | |
1248 | } | |
1249 | } while (++i < *nr_cluster); | |
1250 | ||
1251 | memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); | |
1252 | offset = copy - sizeof(struct msdos_dir_entry); | |
1253 | get_bh(bhs[n]); | |
1254 | *bh = bhs[n]; | |
1255 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
1256 | *i_pos = fat_make_i_pos(sb, *bh, *de); | |
1257 | ||
1258 | /* Second stage: clear the rest of cluster, and write outs */ | |
1259 | err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); | |
1260 | if (err) | |
1261 | goto error_free; | |
1262 | ||
1263 | return cluster[0]; | |
1264 | ||
1265 | error_free: | |
1266 | brelse(*bh); | |
1267 | *bh = NULL; | |
1268 | n = 0; | |
1269 | error_nomem: | |
1270 | for (i = 0; i < n; i++) | |
1271 | bforget(bhs[i]); | |
1272 | fat_free_clusters(dir, cluster[0]); | |
1273 | error: | |
1274 | return err; | |
1275 | } | |
1276 | ||
1277 | int fat_add_entries(struct inode *dir, void *slots, int nr_slots, | |
1278 | struct fat_slot_info *sinfo) | |
1279 | { | |
1280 | struct super_block *sb = dir->i_sb; | |
1281 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1282 | struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ | |
8c320c07 | 1283 | struct msdos_dir_entry *uninitialized_var(de); |
1da177e4 LT |
1284 | int err, free_slots, i, nr_bhs; |
1285 | loff_t pos, i_pos; | |
1286 | ||
1287 | sinfo->nr_slots = nr_slots; | |
1288 | ||
c39540c6 | 1289 | /* First stage: search free directory entries */ |
1da177e4 LT |
1290 | free_slots = nr_bhs = 0; |
1291 | bh = prev = NULL; | |
1292 | pos = 0; | |
1293 | err = -ENOSPC; | |
1294 | while (fat_get_entry(dir, &pos, &bh, &de) > -1) { | |
1295 | /* check the maximum size of directory */ | |
1296 | if (pos >= FAT_MAX_DIR_SIZE) | |
1297 | goto error; | |
1298 | ||
1299 | if (IS_FREE(de->name)) { | |
1300 | if (prev != bh) { | |
1301 | get_bh(bh); | |
1302 | bhs[nr_bhs] = prev = bh; | |
1303 | nr_bhs++; | |
1304 | } | |
1305 | free_slots++; | |
1306 | if (free_slots == nr_slots) | |
1307 | goto found; | |
1308 | } else { | |
1309 | for (i = 0; i < nr_bhs; i++) | |
1310 | brelse(bhs[i]); | |
1311 | prev = NULL; | |
1312 | free_slots = nr_bhs = 0; | |
1313 | } | |
1314 | } | |
1315 | if (dir->i_ino == MSDOS_ROOT_INO) { | |
306790f7 | 1316 | if (!is_fat32(sbi)) |
1da177e4 LT |
1317 | goto error; |
1318 | } else if (MSDOS_I(dir)->i_start == 0) { | |
869f58c0 | 1319 | fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)", |
1da177e4 LT |
1320 | MSDOS_I(dir)->i_pos); |
1321 | err = -EIO; | |
1322 | goto error; | |
1323 | } | |
1324 | ||
1325 | found: | |
1326 | err = 0; | |
1327 | pos -= free_slots * sizeof(*de); | |
1328 | nr_slots -= free_slots; | |
1329 | if (free_slots) { | |
1330 | /* | |
1331 | * Second stage: filling the free entries with new entries. | |
1332 | * NOTE: If this slots has shortname, first, we write | |
1333 | * the long name slots, then write the short name. | |
1334 | */ | |
1335 | int size = free_slots * sizeof(*de); | |
1336 | int offset = pos & (sb->s_blocksize - 1); | |
1337 | int long_bhs = nr_bhs - (nr_slots == 0); | |
1338 | ||
1339 | /* Fill the long name slots. */ | |
1340 | for (i = 0; i < long_bhs; i++) { | |
1341 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1342 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
b522412a | 1343 | mark_buffer_dirty_inode(bhs[i], dir); |
1da177e4 LT |
1344 | offset = 0; |
1345 | slots += copy; | |
1346 | size -= copy; | |
1347 | } | |
1348 | if (long_bhs && IS_DIRSYNC(dir)) | |
1349 | err = fat_sync_bhs(bhs, long_bhs); | |
1350 | if (!err && i < nr_bhs) { | |
1351 | /* Fill the short name slot. */ | |
1352 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1353 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
b522412a | 1354 | mark_buffer_dirty_inode(bhs[i], dir); |
1da177e4 LT |
1355 | if (IS_DIRSYNC(dir)) |
1356 | err = sync_dirty_buffer(bhs[i]); | |
1357 | } | |
1358 | for (i = 0; i < nr_bhs; i++) | |
1359 | brelse(bhs[i]); | |
1360 | if (err) | |
1361 | goto error_remove; | |
1362 | } | |
1363 | ||
1364 | if (nr_slots) { | |
1365 | int cluster, nr_cluster; | |
1366 | ||
1367 | /* | |
1368 | * Third stage: allocate the cluster for new entries. | |
1369 | * And initialize the cluster with new entries, then | |
1370 | * add the cluster to dir. | |
1371 | */ | |
1372 | cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, | |
1373 | &de, &bh, &i_pos); | |
1374 | if (cluster < 0) { | |
1375 | err = cluster; | |
1376 | goto error_remove; | |
1377 | } | |
1378 | err = fat_chain_add(dir, cluster, nr_cluster); | |
1379 | if (err) { | |
1380 | fat_free_clusters(dir, cluster); | |
1381 | goto error_remove; | |
1382 | } | |
1383 | if (dir->i_size & (sbi->cluster_size - 1)) { | |
85c78591 | 1384 | fat_fs_error(sb, "Odd directory size"); |
1da177e4 LT |
1385 | dir->i_size = (dir->i_size + sbi->cluster_size - 1) |
1386 | & ~((loff_t)sbi->cluster_size - 1); | |
1387 | } | |
1388 | dir->i_size += nr_cluster << sbi->cluster_bits; | |
1389 | MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; | |
1390 | } | |
1391 | sinfo->slot_off = pos; | |
1392 | sinfo->de = de; | |
1393 | sinfo->bh = bh; | |
1394 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
1395 | ||
1396 | return 0; | |
1397 | ||
1398 | error: | |
1399 | brelse(bh); | |
1400 | for (i = 0; i < nr_bhs; i++) | |
1401 | brelse(bhs[i]); | |
1402 | return err; | |
1403 | ||
1404 | error_remove: | |
1405 | brelse(bh); | |
1406 | if (free_slots) | |
1407 | __fat_remove_entries(dir, pos, free_slots); | |
1408 | return err; | |
1409 | } | |
7c709d00 | 1410 | EXPORT_SYMBOL_GPL(fat_add_entries); |