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Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/fat/dir.c | |
4 | * | |
5 | * directory handling functions for fat-based filesystems | |
6 | * | |
7 | * Written 1992,1993 by Werner Almesberger | |
8 | * | |
9 | * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu> | |
10 | * | |
11 | * VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu> | |
12 | * Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk> | |
13 | * Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV | |
14 | * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de> | |
15 | */ | |
16 | ||
1da177e4 | 17 | #include <linux/slab.h> |
188f83df | 18 | #include <linux/compat.h> |
f08b4988 | 19 | #include <linux/uaccess.h> |
2489dbab | 20 | #include <linux/iversion.h> |
9e975dae | 21 | #include "fat.h" |
1da177e4 | 22 | |
74675a58 AS |
23 | /* |
24 | * Maximum buffer size of short name. | |
25 | * [(MSDOS_NAME + '.') * max one char + nul] | |
26 | * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul] | |
27 | */ | |
28 | #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1) | |
29 | /* | |
30 | * Maximum buffer size of unicode chars from slots. | |
31 | * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)] | |
32 | */ | |
33 | #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1) | |
34 | #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t)) | |
35 | ||
deb8274a SM |
36 | static inline unsigned char fat_tolower(unsigned char c) |
37 | { | |
38 | return ((c >= 'A') && (c <= 'Z')) ? c+32 : c; | |
39 | } | |
40 | ||
1da177e4 LT |
41 | static inline loff_t fat_make_i_pos(struct super_block *sb, |
42 | struct buffer_head *bh, | |
43 | struct msdos_dir_entry *de) | |
44 | { | |
45 | return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits) | |
46 | | (de - (struct msdos_dir_entry *)bh->b_data); | |
47 | } | |
48 | ||
f3ef6f63 KW |
49 | static inline void fat_dir_readahead(struct inode *dir, sector_t iblock, |
50 | sector_t phys) | |
51 | { | |
52 | struct super_block *sb = dir->i_sb; | |
53 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
54 | struct buffer_head *bh; | |
55 | int sec; | |
56 | ||
57 | /* This is not a first sector of cluster, or sec_per_clus == 1 */ | |
58 | if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1) | |
59 | return; | |
60 | /* root dir of FAT12/FAT16 */ | |
306790f7 | 61 | if (!is_fat32(sbi) && (dir->i_ino == MSDOS_ROOT_INO)) |
f3ef6f63 KW |
62 | return; |
63 | ||
83b7c996 OH |
64 | bh = sb_find_get_block(sb, phys); |
65 | if (bh == NULL || !buffer_uptodate(bh)) { | |
f3ef6f63 KW |
66 | for (sec = 0; sec < sbi->sec_per_clus; sec++) |
67 | sb_breadahead(sb, phys + sec); | |
68 | } | |
69 | brelse(bh); | |
70 | } | |
71 | ||
1da177e4 LT |
72 | /* Returns the inode number of the directory entry at offset pos. If bh is |
73 | non-NULL, it is brelse'd before. Pos is incremented. The buffer header is | |
74 | returned in bh. | |
75 | AV. Most often we do it item-by-item. Makes sense to optimize. | |
76 | AV. OK, there we go: if both bh and de are non-NULL we assume that we just | |
77 | AV. want the next entry (took one explicit de=NULL in vfat/namei.c). | |
78 | AV. It's done in fat_get_entry() (inlined), here the slow case lives. | |
79 | AV. Additionally, when we return -1 (i.e. reached the end of directory) | |
80 | AV. we make bh NULL. | |
81 | */ | |
82 | static int fat__get_entry(struct inode *dir, loff_t *pos, | |
83 | struct buffer_head **bh, struct msdos_dir_entry **de) | |
84 | { | |
85 | struct super_block *sb = dir->i_sb; | |
86 | sector_t phys, iblock; | |
e5174baa OH |
87 | unsigned long mapped_blocks; |
88 | int err, offset; | |
1da177e4 LT |
89 | |
90 | next: | |
91 | if (*bh) | |
92 | brelse(*bh); | |
93 | ||
94 | *bh = NULL; | |
95 | iblock = *pos >> sb->s_blocksize_bits; | |
16fab201 | 96 | err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0, false); |
1da177e4 LT |
97 | if (err || !phys) |
98 | return -1; /* beyond EOF or error */ | |
99 | ||
f3ef6f63 KW |
100 | fat_dir_readahead(dir, iblock, phys); |
101 | ||
1da177e4 LT |
102 | *bh = sb_bread(sb, phys); |
103 | if (*bh == NULL) { | |
f0aac616 NJ |
104 | fat_msg_ratelimit(sb, KERN_ERR, |
105 | "Directory bread(block %llu) failed", (llu)phys); | |
1da177e4 LT |
106 | /* skip this block */ |
107 | *pos = (iblock + 1) << sb->s_blocksize_bits; | |
108 | goto next; | |
109 | } | |
110 | ||
111 | offset = *pos & (sb->s_blocksize - 1); | |
112 | *pos += sizeof(struct msdos_dir_entry); | |
113 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static inline int fat_get_entry(struct inode *dir, loff_t *pos, | |
119 | struct buffer_head **bh, | |
120 | struct msdos_dir_entry **de) | |
121 | { | |
122 | /* Fast stuff first */ | |
123 | if (*bh && *de && | |
f08b4988 CJB |
124 | (*de - (struct msdos_dir_entry *)(*bh)->b_data) < |
125 | MSDOS_SB(dir->i_sb)->dir_per_block - 1) { | |
1da177e4 LT |
126 | *pos += sizeof(struct msdos_dir_entry); |
127 | (*de)++; | |
128 | return 0; | |
129 | } | |
130 | return fat__get_entry(dir, pos, bh, de); | |
131 | } | |
132 | ||
133 | /* | |
4de151d8 | 134 | * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII. |
1da177e4 LT |
135 | * If uni_xlate is enabled and we can't get a 1:1 conversion, use a |
136 | * colon as an escape character since it is normally invalid on the vfat | |
137 | * filesystem. The following four characters are the hexadecimal digits | |
138 | * of Unicode value. This lets us do a full dump and restore of Unicode | |
139 | * filenames. We could get into some trouble with long Unicode names, | |
140 | * but ignore that right now. | |
141 | * Ahem... Stack smashing in ring 0 isn't fun. Fixed. | |
142 | */ | |
869f58c0 OR |
143 | static int uni16_to_x8(struct super_block *sb, unsigned char *ascii, |
144 | const wchar_t *uni, int len, struct nls_table *nls) | |
1da177e4 | 145 | { |
869f58c0 | 146 | int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate; |
d6886116 OH |
147 | const wchar_t *ip; |
148 | wchar_t ec; | |
3ed3dec1 | 149 | unsigned char *op; |
1da177e4 | 150 | int charlen; |
1da177e4 LT |
151 | |
152 | ip = uni; | |
153 | op = ascii; | |
154 | ||
f22032ba | 155 | while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) { |
1da177e4 | 156 | ec = *ip++; |
f08b4988 CJB |
157 | charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE); |
158 | if (charlen > 0) { | |
1da177e4 | 159 | op += charlen; |
f22032ba | 160 | len -= charlen; |
1da177e4 LT |
161 | } else { |
162 | if (uni_xlate == 1) { | |
3ed3dec1 | 163 | *op++ = ':'; |
0a90e0f1 AS |
164 | op = hex_byte_pack(op, ec >> 8); |
165 | op = hex_byte_pack(op, ec); | |
f22032ba | 166 | len -= 5; |
1da177e4 LT |
167 | } else { |
168 | *op++ = '?'; | |
f22032ba | 169 | len--; |
1da177e4 LT |
170 | } |
171 | } | |
1da177e4 | 172 | } |
f22032ba KM |
173 | |
174 | if (unlikely(*ip)) { | |
f08b4988 CJB |
175 | fat_msg(sb, KERN_WARNING, |
176 | "filename was truncated while converting."); | |
f22032ba KM |
177 | } |
178 | ||
1da177e4 | 179 | *op = 0; |
f08b4988 | 180 | return op - ascii; |
1da177e4 LT |
181 | } |
182 | ||
869f58c0 | 183 | static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni, |
d6886116 OH |
184 | unsigned char *buf, int size) |
185 | { | |
869f58c0 | 186 | struct msdos_sb_info *sbi = MSDOS_SB(sb); |
d6886116 | 187 | if (sbi->options.utf8) |
74675a58 AS |
188 | return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS, |
189 | UTF16_HOST_ENDIAN, buf, size); | |
d6886116 | 190 | else |
869f58c0 | 191 | return uni16_to_x8(sb, buf, uni, size, sbi->nls_io); |
d6886116 OH |
192 | } |
193 | ||
1da177e4 LT |
194 | static inline int |
195 | fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni) | |
196 | { | |
197 | int charlen; | |
198 | ||
199 | charlen = t->char2uni(c, clen, uni); | |
200 | if (charlen < 0) { | |
201 | *uni = 0x003f; /* a question mark */ | |
202 | charlen = 1; | |
203 | } | |
204 | return charlen; | |
205 | } | |
206 | ||
207 | static inline int | |
f08b4988 CJB |
208 | fat_short2lower_uni(struct nls_table *t, unsigned char *c, |
209 | int clen, wchar_t *uni) | |
1da177e4 LT |
210 | { |
211 | int charlen; | |
212 | wchar_t wc; | |
213 | ||
214 | charlen = t->char2uni(c, clen, &wc); | |
215 | if (charlen < 0) { | |
216 | *uni = 0x003f; /* a question mark */ | |
217 | charlen = 1; | |
218 | } else if (charlen <= 1) { | |
219 | unsigned char nc = t->charset2lower[*c]; | |
220 | ||
221 | if (!nc) | |
222 | nc = *c; | |
223 | ||
f08b4988 CJB |
224 | charlen = t->char2uni(&nc, 1, uni); |
225 | if (charlen < 0) { | |
1da177e4 LT |
226 | *uni = 0x003f; /* a question mark */ |
227 | charlen = 1; | |
228 | } | |
229 | } else | |
230 | *uni = wc; | |
231 | ||
232 | return charlen; | |
233 | } | |
234 | ||
235 | static inline int | |
236 | fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size, | |
237 | wchar_t *uni_buf, unsigned short opt, int lower) | |
238 | { | |
239 | int len = 0; | |
240 | ||
241 | if (opt & VFAT_SFN_DISPLAY_LOWER) | |
242 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
243 | else if (opt & VFAT_SFN_DISPLAY_WIN95) | |
244 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
245 | else if (opt & VFAT_SFN_DISPLAY_WINNT) { | |
246 | if (lower) | |
247 | len = fat_short2lower_uni(nls, buf, buf_size, uni_buf); | |
248 | else | |
249 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
250 | } else | |
251 | len = fat_short2uni(nls, buf, buf_size, uni_buf); | |
252 | ||
253 | return len; | |
254 | } | |
255 | ||
d6886116 OH |
256 | static inline int fat_name_match(struct msdos_sb_info *sbi, |
257 | const unsigned char *a, int a_len, | |
258 | const unsigned char *b, int b_len) | |
259 | { | |
260 | if (a_len != b_len) | |
261 | return 0; | |
262 | ||
263 | if (sbi->options.name_check != 's') | |
264 | return !nls_strnicmp(sbi->nls_io, a, b, a_len); | |
265 | else | |
266 | return !memcmp(a, b, a_len); | |
267 | } | |
268 | ||
ad2c1604 PE |
269 | enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, }; |
270 | ||
271 | /** | |
272 | * fat_parse_long - Parse extended directory entry. | |
273 | * | |
274 | * This function returns zero on success, negative value on error, or one of | |
275 | * the following: | |
276 | * | |
277 | * %PARSE_INVALID - Directory entry is invalid. | |
278 | * %PARSE_NOT_LONGNAME - Directory entry does not contain longname. | |
279 | * %PARSE_EOF - Directory has no more entries. | |
280 | */ | |
281 | static int fat_parse_long(struct inode *dir, loff_t *pos, | |
282 | struct buffer_head **bh, struct msdos_dir_entry **de, | |
283 | wchar_t **unicode, unsigned char *nr_slots) | |
284 | { | |
285 | struct msdos_dir_slot *ds; | |
286 | unsigned char id, slot, slots, alias_checksum; | |
287 | ||
288 | if (!*unicode) { | |
c7a6c4ed | 289 | *unicode = __getname(); |
ad2c1604 PE |
290 | if (!*unicode) { |
291 | brelse(*bh); | |
292 | return -ENOMEM; | |
293 | } | |
294 | } | |
295 | parse_long: | |
ad2c1604 PE |
296 | ds = (struct msdos_dir_slot *)*de; |
297 | id = ds->id; | |
298 | if (!(id & 0x40)) | |
299 | return PARSE_INVALID; | |
300 | slots = id & ~0x40; | |
301 | if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */ | |
302 | return PARSE_INVALID; | |
303 | *nr_slots = slots; | |
304 | alias_checksum = ds->alias_checksum; | |
305 | ||
306 | slot = slots; | |
307 | while (1) { | |
308 | int offset; | |
309 | ||
310 | slot--; | |
311 | offset = slot * 13; | |
312 | fat16_towchar(*unicode + offset, ds->name0_4, 5); | |
313 | fat16_towchar(*unicode + offset + 5, ds->name5_10, 6); | |
314 | fat16_towchar(*unicode + offset + 11, ds->name11_12, 2); | |
315 | ||
316 | if (ds->id & 0x40) | |
317 | (*unicode)[offset + 13] = 0; | |
318 | if (fat_get_entry(dir, pos, bh, de) < 0) | |
319 | return PARSE_EOF; | |
320 | if (slot == 0) | |
321 | break; | |
322 | ds = (struct msdos_dir_slot *)*de; | |
323 | if (ds->attr != ATTR_EXT) | |
324 | return PARSE_NOT_LONGNAME; | |
325 | if ((ds->id & ~0x40) != slot) | |
326 | goto parse_long; | |
327 | if (ds->alias_checksum != alias_checksum) | |
328 | goto parse_long; | |
329 | } | |
330 | if ((*de)->name[0] == DELETED_FLAG) | |
331 | return PARSE_INVALID; | |
332 | if ((*de)->attr == ATTR_EXT) | |
333 | goto parse_long; | |
334 | if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) | |
335 | return PARSE_INVALID; | |
336 | if (fat_checksum((*de)->name) != alias_checksum) | |
337 | *nr_slots = 0; | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
deb8274a SM |
342 | /** |
343 | * fat_parse_short - Parse MS-DOS (short) directory entry. | |
344 | * @sb: superblock | |
345 | * @de: directory entry to parse | |
346 | * @name: FAT_MAX_SHORT_SIZE array in which to place extracted name | |
347 | * @dot_hidden: Nonzero == prepend '.' to names with ATTR_HIDDEN | |
348 | * | |
349 | * Returns the number of characters extracted into 'name'. | |
350 | */ | |
351 | static int fat_parse_short(struct super_block *sb, | |
352 | const struct msdos_dir_entry *de, | |
353 | unsigned char *name, int dot_hidden) | |
354 | { | |
355 | const struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
356 | int isvfat = sbi->options.isvfat; | |
357 | int nocase = sbi->options.nocase; | |
358 | unsigned short opt_shortname = sbi->options.shortname; | |
359 | struct nls_table *nls_disk = sbi->nls_disk; | |
360 | wchar_t uni_name[14]; | |
361 | unsigned char c, work[MSDOS_NAME]; | |
362 | unsigned char *ptname = name; | |
363 | int chi, chl, i, j, k; | |
364 | int dotoffset = 0; | |
365 | int name_len = 0, uni_len = 0; | |
366 | ||
367 | if (!isvfat && dot_hidden && (de->attr & ATTR_HIDDEN)) { | |
368 | *ptname++ = '.'; | |
369 | dotoffset = 1; | |
370 | } | |
371 | ||
372 | memcpy(work, de->name, sizeof(work)); | |
eceb8902 MM |
373 | /* For an explanation of the special treatment of 0x05 in |
374 | * filenames, see msdos_format_name in namei_msdos.c | |
375 | */ | |
deb8274a SM |
376 | if (work[0] == 0x05) |
377 | work[0] = 0xE5; | |
378 | ||
379 | /* Filename */ | |
380 | for (i = 0, j = 0; i < 8;) { | |
381 | c = work[i]; | |
382 | if (!c) | |
383 | break; | |
384 | chl = fat_shortname2uni(nls_disk, &work[i], 8 - i, | |
385 | &uni_name[j++], opt_shortname, | |
386 | de->lcase & CASE_LOWER_BASE); | |
387 | if (chl <= 1) { | |
388 | if (!isvfat) | |
389 | ptname[i] = nocase ? c : fat_tolower(c); | |
390 | i++; | |
391 | if (c != ' ') { | |
392 | name_len = i; | |
393 | uni_len = j; | |
394 | } | |
395 | } else { | |
396 | uni_len = j; | |
397 | if (isvfat) | |
398 | i += min(chl, 8-i); | |
399 | else { | |
400 | for (chi = 0; chi < chl && i < 8; chi++, i++) | |
401 | ptname[i] = work[i]; | |
402 | } | |
403 | if (chl) | |
404 | name_len = i; | |
405 | } | |
406 | } | |
407 | ||
408 | i = name_len; | |
409 | j = uni_len; | |
410 | fat_short2uni(nls_disk, ".", 1, &uni_name[j++]); | |
411 | if (!isvfat) | |
412 | ptname[i] = '.'; | |
413 | i++; | |
414 | ||
415 | /* Extension */ | |
416 | for (k = 8; k < MSDOS_NAME;) { | |
417 | c = work[k]; | |
418 | if (!c) | |
419 | break; | |
420 | chl = fat_shortname2uni(nls_disk, &work[k], MSDOS_NAME - k, | |
421 | &uni_name[j++], opt_shortname, | |
422 | de->lcase & CASE_LOWER_EXT); | |
423 | if (chl <= 1) { | |
424 | k++; | |
425 | if (!isvfat) | |
426 | ptname[i] = nocase ? c : fat_tolower(c); | |
427 | i++; | |
428 | if (c != ' ') { | |
429 | name_len = i; | |
430 | uni_len = j; | |
431 | } | |
432 | } else { | |
433 | uni_len = j; | |
434 | if (isvfat) { | |
435 | int offset = min(chl, MSDOS_NAME-k); | |
436 | k += offset; | |
437 | i += offset; | |
438 | } else { | |
439 | for (chi = 0; chi < chl && k < MSDOS_NAME; | |
440 | chi++, i++, k++) { | |
441 | ptname[i] = work[k]; | |
442 | } | |
443 | } | |
444 | if (chl) | |
445 | name_len = i; | |
446 | } | |
447 | } | |
448 | ||
449 | if (name_len > 0) { | |
450 | name_len += dotoffset; | |
451 | ||
452 | if (sbi->options.isvfat) { | |
453 | uni_name[uni_len] = 0x0000; | |
454 | name_len = fat_uni_to_x8(sb, uni_name, name, | |
455 | FAT_MAX_SHORT_SIZE); | |
456 | } | |
457 | } | |
458 | ||
459 | return name_len; | |
460 | } | |
461 | ||
1da177e4 | 462 | /* |
c39540c6 | 463 | * Return values: negative -> error/not found, 0 -> found. |
1da177e4 LT |
464 | */ |
465 | int fat_search_long(struct inode *inode, const unsigned char *name, | |
466 | int name_len, struct fat_slot_info *sinfo) | |
467 | { | |
468 | struct super_block *sb = inode->i_sb; | |
469 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
470 | struct buffer_head *bh = NULL; | |
471 | struct msdos_dir_entry *de; | |
f22032ba | 472 | unsigned char nr_slots; |
1da177e4 | 473 | wchar_t *unicode = NULL; |
98a15160 | 474 | unsigned char bufname[FAT_MAX_SHORT_SIZE]; |
1da177e4 | 475 | loff_t cpos = 0; |
deb8274a | 476 | int err, len; |
1da177e4 LT |
477 | |
478 | err = -ENOENT; | |
d6886116 | 479 | while (1) { |
1da177e4 | 480 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
d6886116 | 481 | goto end_of_dir; |
1da177e4 LT |
482 | parse_record: |
483 | nr_slots = 0; | |
484 | if (de->name[0] == DELETED_FLAG) | |
485 | continue; | |
486 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) | |
487 | continue; | |
488 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) | |
489 | continue; | |
490 | if (de->attr == ATTR_EXT) { | |
ad2c1604 PE |
491 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
492 | &unicode, &nr_slots); | |
52e9d9f4 DJ |
493 | if (status < 0) { |
494 | err = status; | |
495 | goto end_of_dir; | |
496 | } else if (status == PARSE_INVALID) | |
1da177e4 | 497 | continue; |
ad2c1604 PE |
498 | else if (status == PARSE_NOT_LONGNAME) |
499 | goto parse_record; | |
500 | else if (status == PARSE_EOF) | |
d6886116 | 501 | goto end_of_dir; |
1da177e4 LT |
502 | } |
503 | ||
deb8274a SM |
504 | /* Never prepend '.' to hidden files here. |
505 | * That is done only for msdos mounts (and only when | |
506 | * 'dotsOK=yes'); if we are executing here, it is in the | |
507 | * context of a vfat mount. | |
508 | */ | |
509 | len = fat_parse_short(sb, de, bufname, 0); | |
510 | if (len == 0) | |
1da177e4 LT |
511 | continue; |
512 | ||
d6886116 | 513 | /* Compare shortname */ |
d6886116 OH |
514 | if (fat_name_match(sbi, name, name_len, bufname, len)) |
515 | goto found; | |
1da177e4 LT |
516 | |
517 | if (nr_slots) { | |
98a15160 OH |
518 | void *longname = unicode + FAT_MAX_UNI_CHARS; |
519 | int size = PATH_MAX - FAT_MAX_UNI_SIZE; | |
520 | ||
d6886116 | 521 | /* Compare longname */ |
869f58c0 | 522 | len = fat_uni_to_x8(sb, unicode, longname, size); |
98a15160 | 523 | if (fat_name_match(sbi, name, name_len, longname, len)) |
d6886116 | 524 | goto found; |
1da177e4 LT |
525 | } |
526 | } | |
527 | ||
d6886116 | 528 | found: |
1da177e4 LT |
529 | nr_slots++; /* include the de */ |
530 | sinfo->slot_off = cpos - nr_slots * sizeof(*de); | |
531 | sinfo->nr_slots = nr_slots; | |
532 | sinfo->de = de; | |
533 | sinfo->bh = bh; | |
534 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
535 | err = 0; | |
d6886116 | 536 | end_of_dir: |
1da177e4 | 537 | if (unicode) |
c7a6c4ed | 538 | __putname(unicode); |
1da177e4 LT |
539 | |
540 | return err; | |
541 | } | |
7c709d00 | 542 | EXPORT_SYMBOL_GPL(fat_search_long); |
1da177e4 LT |
543 | |
544 | struct fat_ioctl_filldir_callback { | |
2c6a2473 | 545 | struct dir_context ctx; |
c483bab0 | 546 | void __user *dirent; |
1da177e4 LT |
547 | int result; |
548 | /* for dir ioctl */ | |
549 | const char *longname; | |
550 | int long_len; | |
551 | const char *shortname; | |
552 | int short_len; | |
553 | }; | |
554 | ||
2c6a2473 AV |
555 | static int __fat_readdir(struct inode *inode, struct file *file, |
556 | struct dir_context *ctx, int short_only, | |
557 | struct fat_ioctl_filldir_callback *both) | |
1da177e4 LT |
558 | { |
559 | struct super_block *sb = inode->i_sb; | |
560 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
561 | struct buffer_head *bh; | |
562 | struct msdos_dir_entry *de; | |
d6886116 | 563 | unsigned char nr_slots; |
1da177e4 | 564 | wchar_t *unicode = NULL; |
deb8274a | 565 | unsigned char bufname[FAT_MAX_SHORT_SIZE]; |
1da177e4 | 566 | int isvfat = sbi->options.isvfat; |
dcd8c53f | 567 | const char *fill_name = NULL; |
2c6a2473 | 568 | int fake_offset = 0; |
1da177e4 | 569 | loff_t cpos; |
deb8274a | 570 | int short_len = 0, fill_len = 0; |
1da177e4 LT |
571 | int ret = 0; |
572 | ||
e40b34c7 | 573 | mutex_lock(&sbi->s_lock); |
1da177e4 | 574 | |
2c6a2473 | 575 | cpos = ctx->pos; |
1da177e4 LT |
576 | /* Fake . and .. for the root directory. */ |
577 | if (inode->i_ino == MSDOS_ROOT_INO) { | |
2c6a2473 AV |
578 | if (!dir_emit_dots(file, ctx)) |
579 | goto out; | |
580 | if (ctx->pos == 2) { | |
581 | fake_offset = 1; | |
1da177e4 LT |
582 | cpos = 0; |
583 | } | |
584 | } | |
d6886116 | 585 | if (cpos & (sizeof(struct msdos_dir_entry) - 1)) { |
1da177e4 LT |
586 | ret = -ENOENT; |
587 | goto out; | |
588 | } | |
589 | ||
590 | bh = NULL; | |
d6886116 | 591 | get_new: |
1da177e4 | 592 | if (fat_get_entry(inode, &cpos, &bh, &de) == -1) |
d6886116 | 593 | goto end_of_dir; |
ad2c1604 | 594 | parse_record: |
d6886116 | 595 | nr_slots = 0; |
dcd8c53f OH |
596 | /* |
597 | * Check for long filename entry, but if short_only, we don't | |
598 | * need to parse long filename. | |
599 | */ | |
600 | if (isvfat && !short_only) { | |
1da177e4 | 601 | if (de->name[0] == DELETED_FLAG) |
d6886116 | 602 | goto record_end; |
1da177e4 | 603 | if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) |
d6886116 | 604 | goto record_end; |
1da177e4 | 605 | if (de->attr != ATTR_EXT && IS_FREE(de->name)) |
d6886116 | 606 | goto record_end; |
1da177e4 LT |
607 | } else { |
608 | if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name)) | |
d6886116 | 609 | goto record_end; |
1da177e4 LT |
610 | } |
611 | ||
612 | if (isvfat && de->attr == ATTR_EXT) { | |
ad2c1604 | 613 | int status = fat_parse_long(inode, &cpos, &bh, &de, |
d6886116 | 614 | &unicode, &nr_slots); |
ad2c1604 | 615 | if (status < 0) { |
928a4771 | 616 | bh = NULL; |
ad2c1604 | 617 | ret = status; |
928a4771 | 618 | goto end_of_dir; |
ad2c1604 | 619 | } else if (status == PARSE_INVALID) |
d6886116 | 620 | goto record_end; |
ad2c1604 PE |
621 | else if (status == PARSE_NOT_LONGNAME) |
622 | goto parse_record; | |
623 | else if (status == PARSE_EOF) | |
d6886116 | 624 | goto end_of_dir; |
dcd8c53f OH |
625 | |
626 | if (nr_slots) { | |
627 | void *longname = unicode + FAT_MAX_UNI_CHARS; | |
628 | int size = PATH_MAX - FAT_MAX_UNI_SIZE; | |
869f58c0 | 629 | int len = fat_uni_to_x8(sb, unicode, longname, size); |
dcd8c53f OH |
630 | |
631 | fill_name = longname; | |
632 | fill_len = len; | |
633 | /* !both && !short_only, so we don't need shortname. */ | |
634 | if (!both) | |
635 | goto start_filldir; | |
2c6a2473 AV |
636 | |
637 | short_len = fat_parse_short(sb, de, bufname, | |
638 | sbi->options.dotsOK); | |
639 | if (short_len == 0) | |
640 | goto record_end; | |
641 | /* hack for fat_ioctl_filldir() */ | |
642 | both->longname = fill_name; | |
643 | both->long_len = fill_len; | |
644 | both->shortname = bufname; | |
645 | both->short_len = short_len; | |
646 | fill_name = NULL; | |
647 | fill_len = 0; | |
648 | goto start_filldir; | |
dcd8c53f | 649 | } |
1da177e4 LT |
650 | } |
651 | ||
deb8274a SM |
652 | short_len = fat_parse_short(sb, de, bufname, sbi->options.dotsOK); |
653 | if (short_len == 0) | |
d6886116 | 654 | goto record_end; |
1da177e4 | 655 | |
2c6a2473 AV |
656 | fill_name = bufname; |
657 | fill_len = short_len; | |
dcd8c53f OH |
658 | |
659 | start_filldir: | |
928a4771 OH |
660 | ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); |
661 | if (fake_offset && ctx->pos < 2) | |
662 | ctx->pos = 2; | |
2c6a2473 AV |
663 | |
664 | if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) { | |
665 | if (!dir_emit_dot(file, ctx)) | |
666 | goto fill_failed; | |
667 | } else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
668 | if (!dir_emit_dotdot(file, ctx)) | |
669 | goto fill_failed; | |
1da177e4 | 670 | } else { |
2c6a2473 | 671 | unsigned long inum; |
1da177e4 LT |
672 | loff_t i_pos = fat_make_i_pos(sb, bh, de); |
673 | struct inode *tmp = fat_iget(sb, i_pos); | |
674 | if (tmp) { | |
675 | inum = tmp->i_ino; | |
676 | iput(tmp); | |
677 | } else | |
678 | inum = iunique(sb, MSDOS_ROOT_INO); | |
2c6a2473 AV |
679 | if (!dir_emit(ctx, fill_name, fill_len, inum, |
680 | (de->attr & ATTR_DIR) ? DT_DIR : DT_REG)) | |
681 | goto fill_failed; | |
1da177e4 LT |
682 | } |
683 | ||
d6886116 | 684 | record_end: |
2c6a2473 AV |
685 | fake_offset = 0; |
686 | ctx->pos = cpos; | |
d6886116 | 687 | goto get_new; |
928a4771 | 688 | |
d6886116 | 689 | end_of_dir: |
928a4771 OH |
690 | if (fake_offset && cpos < 2) |
691 | ctx->pos = 2; | |
692 | else | |
693 | ctx->pos = cpos; | |
d6886116 | 694 | fill_failed: |
f3ef6f63 | 695 | brelse(bh); |
1da177e4 | 696 | if (unicode) |
c7a6c4ed | 697 | __putname(unicode); |
1da177e4 | 698 | out: |
e40b34c7 | 699 | mutex_unlock(&sbi->s_lock); |
928a4771 | 700 | |
1da177e4 LT |
701 | return ret; |
702 | } | |
703 | ||
2c6a2473 | 704 | static int fat_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 705 | { |
2c6a2473 | 706 | return __fat_readdir(file_inode(file), file, ctx, 0, NULL); |
1da177e4 LT |
707 | } |
708 | ||
c483bab0 | 709 | #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ |
ac7576f4 | 710 | static int func(struct dir_context *ctx, const char *name, int name_len, \ |
c483bab0 OH |
711 | loff_t offset, u64 ino, unsigned int d_type) \ |
712 | { \ | |
ac7576f4 MS |
713 | struct fat_ioctl_filldir_callback *buf = \ |
714 | container_of(ctx, struct fat_ioctl_filldir_callback, ctx); \ | |
c483bab0 OH |
715 | struct dirent_type __user *d1 = buf->dirent; \ |
716 | struct dirent_type __user *d2 = d1 + 1; \ | |
717 | \ | |
718 | if (buf->result) \ | |
719 | return -EINVAL; \ | |
720 | buf->result++; \ | |
721 | \ | |
722 | if (name != NULL) { \ | |
723 | /* dirent has only short name */ \ | |
724 | if (name_len >= sizeof(d1->d_name)) \ | |
725 | name_len = sizeof(d1->d_name) - 1; \ | |
726 | \ | |
727 | if (put_user(0, d2->d_name) || \ | |
728 | put_user(0, &d2->d_reclen) || \ | |
729 | copy_to_user(d1->d_name, name, name_len) || \ | |
730 | put_user(0, d1->d_name + name_len) || \ | |
731 | put_user(name_len, &d1->d_reclen)) \ | |
732 | goto efault; \ | |
733 | } else { \ | |
734 | /* dirent has short and long name */ \ | |
735 | const char *longname = buf->longname; \ | |
736 | int long_len = buf->long_len; \ | |
737 | const char *shortname = buf->shortname; \ | |
738 | int short_len = buf->short_len; \ | |
739 | \ | |
740 | if (long_len >= sizeof(d1->d_name)) \ | |
741 | long_len = sizeof(d1->d_name) - 1; \ | |
742 | if (short_len >= sizeof(d1->d_name)) \ | |
743 | short_len = sizeof(d1->d_name) - 1; \ | |
744 | \ | |
745 | if (copy_to_user(d2->d_name, longname, long_len) || \ | |
746 | put_user(0, d2->d_name + long_len) || \ | |
747 | put_user(long_len, &d2->d_reclen) || \ | |
748 | put_user(ino, &d2->d_ino) || \ | |
749 | put_user(offset, &d2->d_off) || \ | |
750 | copy_to_user(d1->d_name, shortname, short_len) || \ | |
751 | put_user(0, d1->d_name + short_len) || \ | |
752 | put_user(short_len, &d1->d_reclen)) \ | |
753 | goto efault; \ | |
754 | } \ | |
755 | return 0; \ | |
756 | efault: \ | |
757 | buf->result = -EFAULT; \ | |
758 | return -EFAULT; \ | |
759 | } | |
760 | ||
531f710f | 761 | FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) |
c483bab0 | 762 | |
2c6a2473 | 763 | static int fat_ioctl_readdir(struct inode *inode, struct file *file, |
c483bab0 OH |
764 | void __user *dirent, filldir_t filldir, |
765 | int short_only, int both) | |
1da177e4 | 766 | { |
2c6a2473 AV |
767 | struct fat_ioctl_filldir_callback buf = { |
768 | .ctx.actor = filldir, | |
769 | .dirent = dirent | |
770 | }; | |
c483bab0 OH |
771 | int ret; |
772 | ||
773 | buf.dirent = dirent; | |
774 | buf.result = 0; | |
98d4b8d8 | 775 | inode_lock_shared(inode); |
2c6a2473 | 776 | buf.ctx.pos = file->f_pos; |
c483bab0 OH |
777 | ret = -ENOENT; |
778 | if (!IS_DEADDIR(inode)) { | |
2c6a2473 AV |
779 | ret = __fat_readdir(inode, file, &buf.ctx, |
780 | short_only, both ? &buf : NULL); | |
781 | file->f_pos = buf.ctx.pos; | |
1da177e4 | 782 | } |
98d4b8d8 | 783 | inode_unlock_shared(inode); |
c483bab0 OH |
784 | if (ret >= 0) |
785 | ret = buf.result; | |
786 | return ret; | |
1da177e4 LT |
787 | } |
788 | ||
7845bc3e AB |
789 | static long fat_dir_ioctl(struct file *filp, unsigned int cmd, |
790 | unsigned long arg) | |
1da177e4 | 791 | { |
496ad9aa | 792 | struct inode *inode = file_inode(filp); |
531f710f | 793 | struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg; |
c483bab0 | 794 | int short_only, both; |
1da177e4 LT |
795 | |
796 | switch (cmd) { | |
797 | case VFAT_IOCTL_READDIR_SHORT: | |
798 | short_only = 1; | |
799 | both = 0; | |
800 | break; | |
801 | case VFAT_IOCTL_READDIR_BOTH: | |
802 | short_only = 0; | |
803 | both = 1; | |
804 | break; | |
805 | default: | |
7845bc3e | 806 | return fat_generic_ioctl(filp, cmd, arg); |
1da177e4 LT |
807 | } |
808 | ||
96d4f267 | 809 | if (!access_ok(d1, sizeof(struct __fat_dirent[2]))) |
1da177e4 LT |
810 | return -EFAULT; |
811 | /* | |
812 | * Yes, we don't need this put_user() absolutely. However old | |
813 | * code didn't return the right value. So, app use this value, | |
814 | * in order to check whether it is EOF. | |
815 | */ | |
816 | if (put_user(0, &d1->d_reclen)) | |
817 | return -EFAULT; | |
818 | ||
c483bab0 OH |
819 | return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir, |
820 | short_only, both); | |
1da177e4 LT |
821 | } |
822 | ||
188f83df DH |
823 | #ifdef CONFIG_COMPAT |
824 | #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2]) | |
825 | #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2]) | |
826 | ||
c483bab0 | 827 | FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent) |
188f83df | 828 | |
c483bab0 | 829 | static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, |
188f83df DH |
830 | unsigned long arg) |
831 | { | |
496ad9aa | 832 | struct inode *inode = file_inode(filp); |
c483bab0 OH |
833 | struct compat_dirent __user *d1 = compat_ptr(arg); |
834 | int short_only, both; | |
188f83df DH |
835 | |
836 | switch (cmd) { | |
188f83df | 837 | case VFAT_IOCTL_READDIR_SHORT32: |
c483bab0 OH |
838 | short_only = 1; |
839 | both = 0; | |
840 | break; | |
841 | case VFAT_IOCTL_READDIR_BOTH32: | |
842 | short_only = 0; | |
843 | both = 1; | |
188f83df DH |
844 | break; |
845 | default: | |
7845bc3e | 846 | return fat_generic_ioctl(filp, cmd, (unsigned long)arg); |
188f83df DH |
847 | } |
848 | ||
96d4f267 | 849 | if (!access_ok(d1, sizeof(struct compat_dirent[2]))) |
c483bab0 OH |
850 | return -EFAULT; |
851 | /* | |
852 | * Yes, we don't need this put_user() absolutely. However old | |
853 | * code didn't return the right value. So, app use this value, | |
854 | * in order to check whether it is EOF. | |
855 | */ | |
856 | if (put_user(0, &d1->d_reclen)) | |
857 | return -EFAULT; | |
858 | ||
859 | return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir, | |
860 | short_only, both); | |
188f83df DH |
861 | } |
862 | #endif /* CONFIG_COMPAT */ | |
863 | ||
4b6f5d20 | 864 | const struct file_operations fat_dir_operations = { |
53472bc8 | 865 | .llseek = generic_file_llseek, |
1da177e4 | 866 | .read = generic_read_dir, |
98d4b8d8 | 867 | .iterate_shared = fat_readdir, |
7845bc3e | 868 | .unlocked_ioctl = fat_dir_ioctl, |
188f83df DH |
869 | #ifdef CONFIG_COMPAT |
870 | .compat_ioctl = fat_compat_dir_ioctl, | |
871 | #endif | |
b522412a | 872 | .fsync = fat_file_fsync, |
1da177e4 LT |
873 | }; |
874 | ||
875 | static int fat_get_short_entry(struct inode *dir, loff_t *pos, | |
876 | struct buffer_head **bh, | |
877 | struct msdos_dir_entry **de) | |
878 | { | |
879 | while (fat_get_entry(dir, pos, bh, de) >= 0) { | |
880 | /* free entry or long name entry or volume label */ | |
881 | if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) | |
882 | return 0; | |
883 | } | |
884 | return -ENOENT; | |
885 | } | |
886 | ||
887 | /* | |
7669e8fb SM |
888 | * The ".." entry can not provide the "struct fat_slot_info" information |
889 | * for inode, nor a usable i_pos. So, this function provides some information | |
890 | * only. | |
891 | * | |
892 | * Since this function walks through the on-disk inodes within a directory, | |
893 | * callers are responsible for taking any locks necessary to prevent the | |
894 | * directory from changing. | |
1da177e4 LT |
895 | */ |
896 | int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, | |
7669e8fb | 897 | struct msdos_dir_entry **de) |
1da177e4 | 898 | { |
7669e8fb | 899 | loff_t offset = 0; |
1da177e4 | 900 | |
7669e8fb | 901 | *de = NULL; |
1da177e4 | 902 | while (fat_get_short_entry(dir, &offset, bh, de) >= 0) { |
7669e8fb | 903 | if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) |
1da177e4 | 904 | return 0; |
1da177e4 LT |
905 | } |
906 | return -ENOENT; | |
907 | } | |
7c709d00 | 908 | EXPORT_SYMBOL_GPL(fat_get_dotdot_entry); |
1da177e4 LT |
909 | |
910 | /* See if directory is empty */ | |
911 | int fat_dir_empty(struct inode *dir) | |
912 | { | |
913 | struct buffer_head *bh; | |
914 | struct msdos_dir_entry *de; | |
915 | loff_t cpos; | |
916 | int result = 0; | |
917 | ||
918 | bh = NULL; | |
919 | cpos = 0; | |
920 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
921 | if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) && | |
922 | strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { | |
923 | result = -ENOTEMPTY; | |
924 | break; | |
925 | } | |
926 | } | |
927 | brelse(bh); | |
928 | return result; | |
929 | } | |
7c709d00 | 930 | EXPORT_SYMBOL_GPL(fat_dir_empty); |
1da177e4 LT |
931 | |
932 | /* | |
933 | * fat_subdirs counts the number of sub-directories of dir. It can be run | |
934 | * on directories being created. | |
935 | */ | |
936 | int fat_subdirs(struct inode *dir) | |
937 | { | |
938 | struct buffer_head *bh; | |
939 | struct msdos_dir_entry *de; | |
940 | loff_t cpos; | |
941 | int count = 0; | |
942 | ||
943 | bh = NULL; | |
944 | cpos = 0; | |
945 | while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) { | |
946 | if (de->attr & ATTR_DIR) | |
947 | count++; | |
948 | } | |
949 | brelse(bh); | |
950 | return count; | |
951 | } | |
952 | ||
953 | /* | |
954 | * Scans a directory for a given file (name points to its formatted name). | |
955 | * Returns an error code or zero. | |
956 | */ | |
957 | int fat_scan(struct inode *dir, const unsigned char *name, | |
958 | struct fat_slot_info *sinfo) | |
959 | { | |
960 | struct super_block *sb = dir->i_sb; | |
961 | ||
962 | sinfo->slot_off = 0; | |
963 | sinfo->bh = NULL; | |
964 | while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, | |
965 | &sinfo->de) >= 0) { | |
966 | if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) { | |
967 | sinfo->slot_off -= sizeof(*sinfo->de); | |
968 | sinfo->nr_slots = 1; | |
969 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
970 | return 0; | |
971 | } | |
972 | } | |
973 | return -ENOENT; | |
974 | } | |
7c709d00 | 975 | EXPORT_SYMBOL_GPL(fat_scan); |
1da177e4 | 976 | |
f1e6fb0a NJ |
977 | /* |
978 | * Scans a directory for a given logstart. | |
979 | * Returns an error code or zero. | |
980 | */ | |
981 | int fat_scan_logstart(struct inode *dir, int i_logstart, | |
982 | struct fat_slot_info *sinfo) | |
983 | { | |
984 | struct super_block *sb = dir->i_sb; | |
985 | ||
986 | sinfo->slot_off = 0; | |
987 | sinfo->bh = NULL; | |
988 | while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh, | |
989 | &sinfo->de) >= 0) { | |
990 | if (fat_get_start(MSDOS_SB(sb), sinfo->de) == i_logstart) { | |
991 | sinfo->slot_off -= sizeof(*sinfo->de); | |
992 | sinfo->nr_slots = 1; | |
993 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
994 | return 0; | |
995 | } | |
996 | } | |
997 | return -ENOENT; | |
998 | } | |
999 | ||
1da177e4 LT |
1000 | static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots) |
1001 | { | |
1002 | struct super_block *sb = dir->i_sb; | |
1003 | struct buffer_head *bh; | |
1004 | struct msdos_dir_entry *de, *endp; | |
1005 | int err = 0, orig_slots; | |
1006 | ||
1007 | while (nr_slots) { | |
1008 | bh = NULL; | |
1009 | if (fat_get_entry(dir, &pos, &bh, &de) < 0) { | |
1010 | err = -EIO; | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | orig_slots = nr_slots; | |
1015 | endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize); | |
1016 | while (nr_slots && de < endp) { | |
1017 | de->name[0] = DELETED_FLAG; | |
1018 | de++; | |
1019 | nr_slots--; | |
1020 | } | |
b522412a | 1021 | mark_buffer_dirty_inode(bh, dir); |
1da177e4 LT |
1022 | if (IS_DIRSYNC(dir)) |
1023 | err = sync_dirty_buffer(bh); | |
1024 | brelse(bh); | |
1025 | if (err) | |
1026 | break; | |
1027 | ||
1028 | /* pos is *next* de's position, so this does `- sizeof(de)' */ | |
1029 | pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de); | |
1030 | } | |
1031 | ||
1032 | return err; | |
1033 | } | |
1034 | ||
1035 | int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo) | |
1036 | { | |
869f58c0 | 1037 | struct super_block *sb = dir->i_sb; |
1da177e4 LT |
1038 | struct msdos_dir_entry *de; |
1039 | struct buffer_head *bh; | |
1040 | int err = 0, nr_slots; | |
1041 | ||
1042 | /* | |
1043 | * First stage: Remove the shortname. By this, the directory | |
1044 | * entry is removed. | |
1045 | */ | |
1046 | nr_slots = sinfo->nr_slots; | |
1047 | de = sinfo->de; | |
1048 | sinfo->de = NULL; | |
1049 | bh = sinfo->bh; | |
1050 | sinfo->bh = NULL; | |
1051 | while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) { | |
1052 | de->name[0] = DELETED_FLAG; | |
1053 | de--; | |
1054 | nr_slots--; | |
1055 | } | |
b522412a | 1056 | mark_buffer_dirty_inode(bh, dir); |
1da177e4 LT |
1057 | if (IS_DIRSYNC(dir)) |
1058 | err = sync_dirty_buffer(bh); | |
1059 | brelse(bh); | |
1060 | if (err) | |
1061 | return err; | |
2489dbab | 1062 | inode_inc_iversion(dir); |
1da177e4 LT |
1063 | |
1064 | if (nr_slots) { | |
1065 | /* | |
1066 | * Second stage: remove the remaining longname slots. | |
1067 | * (This directory entry is already removed, and so return | |
1068 | * the success) | |
1069 | */ | |
1070 | err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots); | |
1071 | if (err) { | |
869f58c0 OR |
1072 | fat_msg(sb, KERN_WARNING, |
1073 | "Couldn't remove the long name slots"); | |
1da177e4 LT |
1074 | } |
1075 | } | |
1076 | ||
cd83f6b1 | 1077 | fat_truncate_time(dir, NULL, S_ATIME|S_MTIME); |
1da177e4 LT |
1078 | if (IS_DIRSYNC(dir)) |
1079 | (void)fat_sync_inode(dir); | |
1080 | else | |
1081 | mark_inode_dirty(dir); | |
1082 | ||
1083 | return 0; | |
1084 | } | |
7c709d00 | 1085 | EXPORT_SYMBOL_GPL(fat_remove_entries); |
1da177e4 LT |
1086 | |
1087 | static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used, | |
1088 | struct buffer_head **bhs, int nr_bhs) | |
1089 | { | |
1090 | struct super_block *sb = dir->i_sb; | |
1091 | sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus; | |
1092 | int err, i, n; | |
1093 | ||
1094 | /* Zeroing the unused blocks on this cluster */ | |
1095 | blknr += nr_used; | |
1096 | n = nr_used; | |
1097 | while (blknr < last_blknr) { | |
1098 | bhs[n] = sb_getblk(sb, blknr); | |
1099 | if (!bhs[n]) { | |
1100 | err = -ENOMEM; | |
1101 | goto error; | |
1102 | } | |
1103 | memset(bhs[n]->b_data, 0, sb->s_blocksize); | |
1104 | set_buffer_uptodate(bhs[n]); | |
b522412a | 1105 | mark_buffer_dirty_inode(bhs[n], dir); |
1da177e4 LT |
1106 | |
1107 | n++; | |
1108 | blknr++; | |
1109 | if (n == nr_bhs) { | |
1110 | if (IS_DIRSYNC(dir)) { | |
1111 | err = fat_sync_bhs(bhs, n); | |
1112 | if (err) | |
1113 | goto error; | |
1114 | } | |
1115 | for (i = 0; i < n; i++) | |
1116 | brelse(bhs[i]); | |
1117 | n = 0; | |
1118 | } | |
1119 | } | |
1120 | if (IS_DIRSYNC(dir)) { | |
1121 | err = fat_sync_bhs(bhs, n); | |
1122 | if (err) | |
1123 | goto error; | |
1124 | } | |
1125 | for (i = 0; i < n; i++) | |
1126 | brelse(bhs[i]); | |
1127 | ||
1128 | return 0; | |
1129 | ||
1130 | error: | |
1131 | for (i = 0; i < n; i++) | |
1132 | bforget(bhs[i]); | |
1133 | return err; | |
1134 | } | |
1135 | ||
f423420c | 1136 | int fat_alloc_new_dir(struct inode *dir, struct timespec64 *ts) |
1da177e4 LT |
1137 | { |
1138 | struct super_block *sb = dir->i_sb; | |
1139 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1140 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1141 | struct msdos_dir_entry *de; | |
1142 | sector_t blknr; | |
1143 | __le16 date, time; | |
7decd1cb | 1144 | u8 time_cs; |
1da177e4 LT |
1145 | int err, cluster; |
1146 | ||
1147 | err = fat_alloc_clusters(dir, &cluster, 1); | |
1148 | if (err) | |
1149 | goto error; | |
1150 | ||
1151 | blknr = fat_clus_to_blknr(sbi, cluster); | |
1152 | bhs[0] = sb_getblk(sb, blknr); | |
1153 | if (!bhs[0]) { | |
1154 | err = -ENOMEM; | |
1155 | goto error_free; | |
1156 | } | |
1157 | ||
7decd1cb | 1158 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
1da177e4 LT |
1159 | |
1160 | de = (struct msdos_dir_entry *)bhs[0]->b_data; | |
1161 | /* filling the new directory slots ("." and ".." entries) */ | |
1162 | memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME); | |
1163 | memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME); | |
1164 | de->attr = de[1].attr = ATTR_DIR; | |
1165 | de[0].lcase = de[1].lcase = 0; | |
1166 | de[0].time = de[1].time = time; | |
1167 | de[0].date = de[1].date = date; | |
1da177e4 LT |
1168 | if (sbi->options.isvfat) { |
1169 | /* extra timestamps */ | |
1170 | de[0].ctime = de[1].ctime = time; | |
7decd1cb | 1171 | de[0].ctime_cs = de[1].ctime_cs = time_cs; |
1da177e4 LT |
1172 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date; |
1173 | } else { | |
1174 | de[0].ctime = de[1].ctime = 0; | |
7decd1cb | 1175 | de[0].ctime_cs = de[1].ctime_cs = 0; |
1da177e4 LT |
1176 | de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0; |
1177 | } | |
4b637098 NJ |
1178 | fat_set_start(&de[0], cluster); |
1179 | fat_set_start(&de[1], MSDOS_I(dir)->i_logstart); | |
1da177e4 LT |
1180 | de[0].size = de[1].size = 0; |
1181 | memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de)); | |
1182 | set_buffer_uptodate(bhs[0]); | |
b522412a | 1183 | mark_buffer_dirty_inode(bhs[0], dir); |
1da177e4 LT |
1184 | |
1185 | err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE); | |
1186 | if (err) | |
1187 | goto error_free; | |
1188 | ||
1189 | return cluster; | |
1190 | ||
1191 | error_free: | |
1192 | fat_free_clusters(dir, cluster); | |
1193 | error: | |
1194 | return err; | |
1195 | } | |
7c709d00 | 1196 | EXPORT_SYMBOL_GPL(fat_alloc_new_dir); |
1da177e4 LT |
1197 | |
1198 | static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots, | |
1199 | int *nr_cluster, struct msdos_dir_entry **de, | |
1200 | struct buffer_head **bh, loff_t *i_pos) | |
1201 | { | |
1202 | struct super_block *sb = dir->i_sb; | |
1203 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1204 | struct buffer_head *bhs[MAX_BUF_PER_PAGE]; | |
1205 | sector_t blknr, start_blknr, last_blknr; | |
1206 | unsigned long size, copy; | |
1207 | int err, i, n, offset, cluster[2]; | |
1208 | ||
1209 | /* | |
1210 | * The minimum cluster size is 512bytes, and maximum entry | |
1211 | * size is 32*slots (672bytes). So, iff the cluster size is | |
1212 | * 512bytes, we may need two clusters. | |
1213 | */ | |
1214 | size = nr_slots * sizeof(struct msdos_dir_entry); | |
1215 | *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits; | |
1216 | BUG_ON(*nr_cluster > 2); | |
1217 | ||
1218 | err = fat_alloc_clusters(dir, cluster, *nr_cluster); | |
1219 | if (err) | |
1220 | goto error; | |
1221 | ||
1222 | /* | |
1223 | * First stage: Fill the directory entry. NOTE: This cluster | |
1224 | * is not referenced from any inode yet, so updates order is | |
1225 | * not important. | |
1226 | */ | |
1227 | i = n = copy = 0; | |
1228 | do { | |
1229 | start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]); | |
1230 | last_blknr = start_blknr + sbi->sec_per_clus; | |
1231 | while (blknr < last_blknr) { | |
1232 | bhs[n] = sb_getblk(sb, blknr); | |
1233 | if (!bhs[n]) { | |
1234 | err = -ENOMEM; | |
1235 | goto error_nomem; | |
1236 | } | |
1237 | ||
1238 | /* fill the directory entry */ | |
1239 | copy = min(size, sb->s_blocksize); | |
1240 | memcpy(bhs[n]->b_data, slots, copy); | |
1241 | slots += copy; | |
1242 | size -= copy; | |
1243 | set_buffer_uptodate(bhs[n]); | |
b522412a | 1244 | mark_buffer_dirty_inode(bhs[n], dir); |
1da177e4 LT |
1245 | if (!size) |
1246 | break; | |
1247 | n++; | |
1248 | blknr++; | |
1249 | } | |
1250 | } while (++i < *nr_cluster); | |
1251 | ||
1252 | memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy); | |
1253 | offset = copy - sizeof(struct msdos_dir_entry); | |
1254 | get_bh(bhs[n]); | |
1255 | *bh = bhs[n]; | |
1256 | *de = (struct msdos_dir_entry *)((*bh)->b_data + offset); | |
1257 | *i_pos = fat_make_i_pos(sb, *bh, *de); | |
1258 | ||
1259 | /* Second stage: clear the rest of cluster, and write outs */ | |
1260 | err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE); | |
1261 | if (err) | |
1262 | goto error_free; | |
1263 | ||
1264 | return cluster[0]; | |
1265 | ||
1266 | error_free: | |
1267 | brelse(*bh); | |
1268 | *bh = NULL; | |
1269 | n = 0; | |
1270 | error_nomem: | |
1271 | for (i = 0; i < n; i++) | |
1272 | bforget(bhs[i]); | |
1273 | fat_free_clusters(dir, cluster[0]); | |
1274 | error: | |
1275 | return err; | |
1276 | } | |
1277 | ||
1278 | int fat_add_entries(struct inode *dir, void *slots, int nr_slots, | |
1279 | struct fat_slot_info *sinfo) | |
1280 | { | |
1281 | struct super_block *sb = dir->i_sb; | |
1282 | struct msdos_sb_info *sbi = MSDOS_SB(sb); | |
1283 | struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */ | |
8c320c07 | 1284 | struct msdos_dir_entry *uninitialized_var(de); |
1da177e4 LT |
1285 | int err, free_slots, i, nr_bhs; |
1286 | loff_t pos, i_pos; | |
1287 | ||
1288 | sinfo->nr_slots = nr_slots; | |
1289 | ||
c39540c6 | 1290 | /* First stage: search free directory entries */ |
1da177e4 LT |
1291 | free_slots = nr_bhs = 0; |
1292 | bh = prev = NULL; | |
1293 | pos = 0; | |
1294 | err = -ENOSPC; | |
1295 | while (fat_get_entry(dir, &pos, &bh, &de) > -1) { | |
1296 | /* check the maximum size of directory */ | |
1297 | if (pos >= FAT_MAX_DIR_SIZE) | |
1298 | goto error; | |
1299 | ||
1300 | if (IS_FREE(de->name)) { | |
1301 | if (prev != bh) { | |
1302 | get_bh(bh); | |
1303 | bhs[nr_bhs] = prev = bh; | |
1304 | nr_bhs++; | |
1305 | } | |
1306 | free_slots++; | |
1307 | if (free_slots == nr_slots) | |
1308 | goto found; | |
1309 | } else { | |
1310 | for (i = 0; i < nr_bhs; i++) | |
1311 | brelse(bhs[i]); | |
1312 | prev = NULL; | |
1313 | free_slots = nr_bhs = 0; | |
1314 | } | |
1315 | } | |
1316 | if (dir->i_ino == MSDOS_ROOT_INO) { | |
306790f7 | 1317 | if (!is_fat32(sbi)) |
1da177e4 LT |
1318 | goto error; |
1319 | } else if (MSDOS_I(dir)->i_start == 0) { | |
869f58c0 | 1320 | fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)", |
1da177e4 LT |
1321 | MSDOS_I(dir)->i_pos); |
1322 | err = -EIO; | |
1323 | goto error; | |
1324 | } | |
1325 | ||
1326 | found: | |
1327 | err = 0; | |
1328 | pos -= free_slots * sizeof(*de); | |
1329 | nr_slots -= free_slots; | |
1330 | if (free_slots) { | |
1331 | /* | |
1332 | * Second stage: filling the free entries with new entries. | |
1333 | * NOTE: If this slots has shortname, first, we write | |
1334 | * the long name slots, then write the short name. | |
1335 | */ | |
1336 | int size = free_slots * sizeof(*de); | |
1337 | int offset = pos & (sb->s_blocksize - 1); | |
1338 | int long_bhs = nr_bhs - (nr_slots == 0); | |
1339 | ||
1340 | /* Fill the long name slots. */ | |
1341 | for (i = 0; i < long_bhs; i++) { | |
1342 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1343 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
b522412a | 1344 | mark_buffer_dirty_inode(bhs[i], dir); |
1da177e4 LT |
1345 | offset = 0; |
1346 | slots += copy; | |
1347 | size -= copy; | |
1348 | } | |
1349 | if (long_bhs && IS_DIRSYNC(dir)) | |
1350 | err = fat_sync_bhs(bhs, long_bhs); | |
1351 | if (!err && i < nr_bhs) { | |
1352 | /* Fill the short name slot. */ | |
1353 | int copy = min_t(int, sb->s_blocksize - offset, size); | |
1354 | memcpy(bhs[i]->b_data + offset, slots, copy); | |
b522412a | 1355 | mark_buffer_dirty_inode(bhs[i], dir); |
1da177e4 LT |
1356 | if (IS_DIRSYNC(dir)) |
1357 | err = sync_dirty_buffer(bhs[i]); | |
1358 | } | |
1359 | for (i = 0; i < nr_bhs; i++) | |
1360 | brelse(bhs[i]); | |
1361 | if (err) | |
1362 | goto error_remove; | |
1363 | } | |
1364 | ||
1365 | if (nr_slots) { | |
1366 | int cluster, nr_cluster; | |
1367 | ||
1368 | /* | |
1369 | * Third stage: allocate the cluster for new entries. | |
1370 | * And initialize the cluster with new entries, then | |
1371 | * add the cluster to dir. | |
1372 | */ | |
1373 | cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster, | |
1374 | &de, &bh, &i_pos); | |
1375 | if (cluster < 0) { | |
1376 | err = cluster; | |
1377 | goto error_remove; | |
1378 | } | |
1379 | err = fat_chain_add(dir, cluster, nr_cluster); | |
1380 | if (err) { | |
1381 | fat_free_clusters(dir, cluster); | |
1382 | goto error_remove; | |
1383 | } | |
1384 | if (dir->i_size & (sbi->cluster_size - 1)) { | |
85c78591 | 1385 | fat_fs_error(sb, "Odd directory size"); |
1da177e4 LT |
1386 | dir->i_size = (dir->i_size + sbi->cluster_size - 1) |
1387 | & ~((loff_t)sbi->cluster_size - 1); | |
1388 | } | |
1389 | dir->i_size += nr_cluster << sbi->cluster_bits; | |
1390 | MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits; | |
1391 | } | |
1392 | sinfo->slot_off = pos; | |
1393 | sinfo->de = de; | |
1394 | sinfo->bh = bh; | |
1395 | sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de); | |
1396 | ||
1397 | return 0; | |
1398 | ||
1399 | error: | |
1400 | brelse(bh); | |
1401 | for (i = 0; i < nr_bhs; i++) | |
1402 | brelse(bhs[i]); | |
1403 | return err; | |
1404 | ||
1405 | error_remove: | |
1406 | brelse(bh); | |
1407 | if (free_slots) | |
1408 | __fat_remove_entries(dir, pos, free_slots); | |
1409 | return err; | |
1410 | } | |
7c709d00 | 1411 | EXPORT_SYMBOL_GPL(fat_add_entries); |