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Linux 3.12.28
[linux/fpc-iii.git] / fs / fat / dir.c
blob3963ede84eb021887531ea94eb41ea4f203fdc0e
1 /*
2 * linux/fs/fat/dir.c
3 *
4 * directory handling functions for fat-based filesystems
5 *
6 * Written 1992,1993 by Werner Almesberger
7 *
8 * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
9 *
10 * VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
11 * Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
12 * Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
13 * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
14 */
15
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/time.h>
19 #include <linux/buffer_head.h>
20 #include <linux/compat.h>
21 #include <linux/uaccess.h>
22 #include <linux/kernel.h>
23 #include "fat.h"
24
25 /*
26 * Maximum buffer size of short name.
27 * [(MSDOS_NAME + '.') * max one char + nul]
28 * For msdos style, ['.' (hidden) + MSDOS_NAME + '.' + nul]
29 */
30 #define FAT_MAX_SHORT_SIZE ((MSDOS_NAME + 1) * NLS_MAX_CHARSET_SIZE + 1)
31 /*
32 * Maximum buffer size of unicode chars from slots.
33 * [(max longname slots * 13 (size in a slot) + nul) * sizeof(wchar_t)]
34 */
35 #define FAT_MAX_UNI_CHARS ((MSDOS_SLOTS - 1) * 13 + 1)
36 #define FAT_MAX_UNI_SIZE (FAT_MAX_UNI_CHARS * sizeof(wchar_t))
37
38 static inline unsigned char fat_tolower(unsigned char c)
39 {
40 return ((c >= 'A') && (c <= 'Z')) ? c+32 : c;
41 }
42
43 static inline loff_t fat_make_i_pos(struct super_block *sb,
44 struct buffer_head *bh,
45 struct msdos_dir_entry *de)
46 {
47 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
48 | (de - (struct msdos_dir_entry *)bh->b_data);
49 }
50
51 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
52 sector_t phys)
53 {
54 struct super_block *sb = dir->i_sb;
55 struct msdos_sb_info *sbi = MSDOS_SB(sb);
56 struct buffer_head *bh;
57 int sec;
58
59 /* This is not a first sector of cluster, or sec_per_clus == 1 */
60 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
61 return;
62 /* root dir of FAT12/FAT16 */
63 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
64 return;
65
66 bh = sb_find_get_block(sb, phys);
67 if (bh == NULL || !buffer_uptodate(bh)) {
68 for (sec = 0; sec < sbi->sec_per_clus; sec++)
69 sb_breadahead(sb, phys + sec);
70 }
71 brelse(bh);
72 }
73
74 /* Returns the inode number of the directory entry at offset pos. If bh is
75 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
76 returned in bh.
77 AV. Most often we do it item-by-item. Makes sense to optimize.
78 AV. OK, there we go: if both bh and de are non-NULL we assume that we just
79 AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
80 AV. It's done in fat_get_entry() (inlined), here the slow case lives.
81 AV. Additionally, when we return -1 (i.e. reached the end of directory)
82 AV. we make bh NULL.
83 */
84 static int fat__get_entry(struct inode *dir, loff_t *pos,
85 struct buffer_head **bh, struct msdos_dir_entry **de)
86 {
87 struct super_block *sb = dir->i_sb;
88 sector_t phys, iblock;
89 unsigned long mapped_blocks;
90 int err, offset;
91
92 next:
93 if (*bh)
94 brelse(*bh);
95
96 *bh = NULL;
97 iblock = *pos >> sb->s_blocksize_bits;
98 err = fat_bmap(dir, iblock, &phys, &mapped_blocks, 0);
99 if (err || !phys)
100 return -1; /* beyond EOF or error */
101
102 fat_dir_readahead(dir, iblock, phys);
103
104 *bh = sb_bread(sb, phys);
105 if (*bh == NULL) {
106 fat_msg_ratelimit(sb, KERN_ERR,
107 "Directory bread(block %llu) failed", (llu)phys);
108 /* skip this block */
109 *pos = (iblock + 1) << sb->s_blocksize_bits;
110 goto next;
111 }
112
113 offset = *pos & (sb->s_blocksize - 1);
114 *pos += sizeof(struct msdos_dir_entry);
115 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
116
117 return 0;
118 }
119
120 static inline int fat_get_entry(struct inode *dir, loff_t *pos,
121 struct buffer_head **bh,
122 struct msdos_dir_entry **de)
123 {
124 /* Fast stuff first */
125 if (*bh && *de &&
126 (*de - (struct msdos_dir_entry *)(*bh)->b_data) <
127 MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
128 *pos += sizeof(struct msdos_dir_entry);
129 (*de)++;
130 return 0;
131 }
132 return fat__get_entry(dir, pos, bh, de);
133 }
134
135 /*
136 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII.
137 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
138 * colon as an escape character since it is normally invalid on the vfat
139 * filesystem. The following four characters are the hexadecimal digits
140 * of Unicode value. This lets us do a full dump and restore of Unicode
141 * filenames. We could get into some trouble with long Unicode names,
142 * but ignore that right now.
143 * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
144 */
145 static int uni16_to_x8(struct super_block *sb, unsigned char *ascii,
146 const wchar_t *uni, int len, struct nls_table *nls)
147 {
148 int uni_xlate = MSDOS_SB(sb)->options.unicode_xlate;
149 const wchar_t *ip;
150 wchar_t ec;
151 unsigned char *op;
152 int charlen;
153
154 ip = uni;
155 op = ascii;
156
157 while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) {
158 ec = *ip++;
159 charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE);
160 if (charlen > 0) {
161 op += charlen;
162 len -= charlen;
163 } else {
164 if (uni_xlate == 1) {
165 *op++ = ':';
166 op = hex_byte_pack(op, ec >> 8);
167 op = hex_byte_pack(op, ec);
168 len -= 5;
169 } else {
170 *op++ = '?';
171 len--;
172 }
173 }
174 }
175
176 if (unlikely(*ip)) {
177 fat_msg(sb, KERN_WARNING,
178 "filename was truncated while converting.");
179 }
180
181 *op = 0;
182 return op - ascii;
183 }
184
185 static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni,
186 unsigned char *buf, int size)
187 {
188 struct msdos_sb_info *sbi = MSDOS_SB(sb);
189 if (sbi->options.utf8)
190 return utf16s_to_utf8s(uni, FAT_MAX_UNI_CHARS,
191 UTF16_HOST_ENDIAN, buf, size);
192 else
193 return uni16_to_x8(sb, buf, uni, size, sbi->nls_io);
194 }
195
196 static inline int
197 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
198 {
199 int charlen;
200
201 charlen = t->char2uni(c, clen, uni);
202 if (charlen < 0) {
203 *uni = 0x003f; /* a question mark */
204 charlen = 1;
205 }
206 return charlen;
207 }
208
209 static inline int
210 fat_short2lower_uni(struct nls_table *t, unsigned char *c,
211 int clen, wchar_t *uni)
212 {
213 int charlen;
214 wchar_t wc;
215
216 charlen = t->char2uni(c, clen, &wc);
217 if (charlen < 0) {
218 *uni = 0x003f; /* a question mark */
219 charlen = 1;
220 } else if (charlen <= 1) {
221 unsigned char nc = t->charset2lower[*c];
222
223 if (!nc)
224 nc = *c;
225
226 charlen = t->char2uni(&nc, 1, uni);
227 if (charlen < 0) {
228 *uni = 0x003f; /* a question mark */
229 charlen = 1;
230 }
231 } else
232 *uni = wc;
233
234 return charlen;
235 }
236
237 static inline int
238 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
239 wchar_t *uni_buf, unsigned short opt, int lower)
240 {
241 int len = 0;
242
243 if (opt & VFAT_SFN_DISPLAY_LOWER)
244 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
245 else if (opt & VFAT_SFN_DISPLAY_WIN95)
246 len = fat_short2uni(nls, buf, buf_size, uni_buf);
247 else if (opt & VFAT_SFN_DISPLAY_WINNT) {
248 if (lower)
249 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
250 else
251 len = fat_short2uni(nls, buf, buf_size, uni_buf);
252 } else
253 len = fat_short2uni(nls, buf, buf_size, uni_buf);
254
255 return len;
256 }
257
258 static inline int fat_name_match(struct msdos_sb_info *sbi,
259 const unsigned char *a, int a_len,
260 const unsigned char *b, int b_len)
261 {
262 if (a_len != b_len)
263 return 0;
264
265 if (sbi->options.name_check != 's')
266 return !nls_strnicmp(sbi->nls_io, a, b, a_len);
267 else
268 return !memcmp(a, b, a_len);
269 }
270
271 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
272
273 /**
274 * fat_parse_long - Parse extended directory entry.
275 *
276 * This function returns zero on success, negative value on error, or one of
277 * the following:
278 *
279 * %PARSE_INVALID - Directory entry is invalid.
280 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname.
281 * %PARSE_EOF - Directory has no more entries.
282 */
283 static int fat_parse_long(struct inode *dir, loff_t *pos,
284 struct buffer_head **bh, struct msdos_dir_entry **de,
285 wchar_t **unicode, unsigned char *nr_slots)
286 {
287 struct msdos_dir_slot *ds;
288 unsigned char id, slot, slots, alias_checksum;
289
290 if (!*unicode) {
291 *unicode = __getname();
292 if (!*unicode) {
293 brelse(*bh);
294 return -ENOMEM;
295 }
296 }
297 parse_long:
298 slots = 0;
299 ds = (struct msdos_dir_slot *)*de;
300 id = ds->id;
301 if (!(id & 0x40))
302 return PARSE_INVALID;
303 slots = id & ~0x40;
304 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
305 return PARSE_INVALID;
306 *nr_slots = slots;
307 alias_checksum = ds->alias_checksum;
308
309 slot = slots;
310 while (1) {
311 int offset;
312
313 slot--;
314 offset = slot * 13;
315 fat16_towchar(*unicode + offset, ds->name0_4, 5);
316 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6);
317 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2);
318
319 if (ds->id & 0x40)
320 (*unicode)[offset + 13] = 0;
321 if (fat_get_entry(dir, pos, bh, de) < 0)
322 return PARSE_EOF;
323 if (slot == 0)
324 break;
325 ds = (struct msdos_dir_slot *)*de;
326 if (ds->attr != ATTR_EXT)
327 return PARSE_NOT_LONGNAME;
328 if ((ds->id & ~0x40) != slot)
329 goto parse_long;
330 if (ds->alias_checksum != alias_checksum)
331 goto parse_long;
332 }
333 if ((*de)->name[0] == DELETED_FLAG)
334 return PARSE_INVALID;
335 if ((*de)->attr == ATTR_EXT)
336 goto parse_long;
337 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME))
338 return PARSE_INVALID;
339 if (fat_checksum((*de)->name) != alias_checksum)
340 *nr_slots = 0;
341
342 return 0;
343 }
344
345 /**
346 * fat_parse_short - Parse MS-DOS (short) directory entry.
347 * @sb: superblock
348 * @de: directory entry to parse
349 * @name: FAT_MAX_SHORT_SIZE array in which to place extracted name
350 * @dot_hidden: Nonzero == prepend '.' to names with ATTR_HIDDEN
351 *
352 * Returns the number of characters extracted into 'name'.
353 */
354 static int fat_parse_short(struct super_block *sb,
355 const struct msdos_dir_entry *de,
356 unsigned char *name, int dot_hidden)
357 {
358 const struct msdos_sb_info *sbi = MSDOS_SB(sb);
359 int isvfat = sbi->options.isvfat;
360 int nocase = sbi->options.nocase;
361 unsigned short opt_shortname = sbi->options.shortname;
362 struct nls_table *nls_disk = sbi->nls_disk;
363 wchar_t uni_name[14];
364 unsigned char c, work[MSDOS_NAME];
365 unsigned char *ptname = name;
366 int chi, chl, i, j, k;
367 int dotoffset = 0;
368 int name_len = 0, uni_len = 0;
369
370 if (!isvfat && dot_hidden && (de->attr & ATTR_HIDDEN)) {
371 *ptname++ = '.';
372 dotoffset = 1;
373 }
374
375 memcpy(work, de->name, sizeof(work));
376 /* see namei.c, msdos_format_name */
377 if (work[0] == 0x05)
378 work[0] = 0xE5;
379
380 /* Filename */
381 for (i = 0, j = 0; i < 8;) {
382 c = work[i];
383 if (!c)
384 break;
385 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
386 &uni_name[j++], opt_shortname,
387 de->lcase & CASE_LOWER_BASE);
388 if (chl <= 1) {
389 if (!isvfat)
390 ptname[i] = nocase ? c : fat_tolower(c);
391 i++;
392 if (c != ' ') {
393 name_len = i;
394 uni_len = j;
395 }
396 } else {
397 uni_len = j;
398 if (isvfat)
399 i += min(chl, 8-i);
400 else {
401 for (chi = 0; chi < chl && i < 8; chi++, i++)
402 ptname[i] = work[i];
403 }
404 if (chl)
405 name_len = i;
406 }
407 }
408
409 i = name_len;
410 j = uni_len;
411 fat_short2uni(nls_disk, ".", 1, &uni_name[j++]);
412 if (!isvfat)
413 ptname[i] = '.';
414 i++;
415
416 /* Extension */
417 for (k = 8; k < MSDOS_NAME;) {
418 c = work[k];
419 if (!c)
420 break;
421 chl = fat_shortname2uni(nls_disk, &work[k], MSDOS_NAME - k,
422 &uni_name[j++], opt_shortname,
423 de->lcase & CASE_LOWER_EXT);
424 if (chl <= 1) {
425 k++;
426 if (!isvfat)
427 ptname[i] = nocase ? c : fat_tolower(c);
428 i++;
429 if (c != ' ') {
430 name_len = i;
431 uni_len = j;
432 }
433 } else {
434 uni_len = j;
435 if (isvfat) {
436 int offset = min(chl, MSDOS_NAME-k);
437 k += offset;
438 i += offset;
439 } else {
440 for (chi = 0; chi < chl && k < MSDOS_NAME;
441 chi++, i++, k++) {
442 ptname[i] = work[k];
443 }
444 }
445 if (chl)
446 name_len = i;
447 }
448 }
449
450 if (name_len > 0) {
451 name_len += dotoffset;
452
453 if (sbi->options.isvfat) {
454 uni_name[uni_len] = 0x0000;
455 name_len = fat_uni_to_x8(sb, uni_name, name,
456 FAT_MAX_SHORT_SIZE);
457 }
458 }
459
460 return name_len;
461 }
462
463 /*
464 * Return values: negative -> error/not found, 0 -> found.
465 */
466 int fat_search_long(struct inode *inode, const unsigned char *name,
467 int name_len, struct fat_slot_info *sinfo)
468 {
469 struct super_block *sb = inode->i_sb;
470 struct msdos_sb_info *sbi = MSDOS_SB(sb);
471 struct buffer_head *bh = NULL;
472 struct msdos_dir_entry *de;
473 unsigned char nr_slots;
474 wchar_t *unicode = NULL;
475 unsigned char bufname[FAT_MAX_SHORT_SIZE];
476 loff_t cpos = 0;
477 int err, len;
478
479 err = -ENOENT;
480 while (1) {
481 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
482 goto end_of_dir;
483 parse_record:
484 nr_slots = 0;
485 if (de->name[0] == DELETED_FLAG)
486 continue;
487 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
488 continue;
489 if (de->attr != ATTR_EXT && IS_FREE(de->name))
490 continue;
491 if (de->attr == ATTR_EXT) {
492 int status = fat_parse_long(inode, &cpos, &bh, &de,
493 &unicode, &nr_slots);
494 if (status < 0) {
495 err = status;
496 goto end_of_dir;
497 } else if (status == PARSE_INVALID)
498 continue;
499 else if (status == PARSE_NOT_LONGNAME)
500 goto parse_record;
501 else if (status == PARSE_EOF)
502 goto end_of_dir;
503 }
504
505 /* Never prepend '.' to hidden files here.
506 * That is done only for msdos mounts (and only when
507 * 'dotsOK=yes'); if we are executing here, it is in the
508 * context of a vfat mount.
509 */
510 len = fat_parse_short(sb, de, bufname, 0);
511 if (len == 0)
512 continue;
513
514 /* Compare shortname */
515 if (fat_name_match(sbi, name, name_len, bufname, len))
516 goto found;
517
518 if (nr_slots) {
519 void *longname = unicode + FAT_MAX_UNI_CHARS;
520 int size = PATH_MAX - FAT_MAX_UNI_SIZE;
521
522 /* Compare longname */
523 len = fat_uni_to_x8(sb, unicode, longname, size);
524 if (fat_name_match(sbi, name, name_len, longname, len))
525 goto found;
526 }
527 }
528
529 found:
530 nr_slots++; /* include the de */
531 sinfo->slot_off = cpos - nr_slots * sizeof(*de);
532 sinfo->nr_slots = nr_slots;
533 sinfo->de = de;
534 sinfo->bh = bh;
535 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
536 err = 0;
537 end_of_dir:
538 if (unicode)
539 __putname(unicode);
540
541 return err;
542 }
543 EXPORT_SYMBOL_GPL(fat_search_long);
544
545 struct fat_ioctl_filldir_callback {
546 struct dir_context ctx;
547 void __user *dirent;
548 int result;
549 /* for dir ioctl */
550 const char *longname;
551 int long_len;
552 const char *shortname;
553 int short_len;
554 };
555
556 static int __fat_readdir(struct inode *inode, struct file *file,
557 struct dir_context *ctx, int short_only,
558 struct fat_ioctl_filldir_callback *both)
559 {
560 struct super_block *sb = inode->i_sb;
561 struct msdos_sb_info *sbi = MSDOS_SB(sb);
562 struct buffer_head *bh;
563 struct msdos_dir_entry *de;
564 unsigned char nr_slots;
565 wchar_t *unicode = NULL;
566 unsigned char bufname[FAT_MAX_SHORT_SIZE];
567 int isvfat = sbi->options.isvfat;
568 const char *fill_name = NULL;
569 int fake_offset = 0;
570 loff_t cpos;
571 int short_len = 0, fill_len = 0;
572 int ret = 0;
573
574 mutex_lock(&sbi->s_lock);
575
576 cpos = ctx->pos;
577 /* Fake . and .. for the root directory. */
578 if (inode->i_ino == MSDOS_ROOT_INO) {
579 if (!dir_emit_dots(file, ctx))
580 goto out;
581 if (ctx->pos == 2) {
582 fake_offset = 1;
583 cpos = 0;
584 }
585 }
586 if (cpos & (sizeof(struct msdos_dir_entry) - 1)) {
587 ret = -ENOENT;
588 goto out;
589 }
590
591 bh = NULL;
592 get_new:
593 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
594 goto end_of_dir;
595 parse_record:
596 nr_slots = 0;
597 /*
598 * Check for long filename entry, but if short_only, we don't
599 * need to parse long filename.
600 */
601 if (isvfat && !short_only) {
602 if (de->name[0] == DELETED_FLAG)
603 goto record_end;
604 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
605 goto record_end;
606 if (de->attr != ATTR_EXT && IS_FREE(de->name))
607 goto record_end;
608 } else {
609 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
610 goto record_end;
611 }
612
613 if (isvfat && de->attr == ATTR_EXT) {
614 int status = fat_parse_long(inode, &cpos, &bh, &de,
615 &unicode, &nr_slots);
616 if (status < 0) {
617 ctx->pos = cpos;
618 ret = status;
619 goto out;
620 } else if (status == PARSE_INVALID)
621 goto record_end;
622 else if (status == PARSE_NOT_LONGNAME)
623 goto parse_record;
624 else if (status == PARSE_EOF)
625 goto end_of_dir;
626
627 if (nr_slots) {
628 void *longname = unicode + FAT_MAX_UNI_CHARS;
629 int size = PATH_MAX - FAT_MAX_UNI_SIZE;
630 int len = fat_uni_to_x8(sb, unicode, longname, size);
631
632 fill_name = longname;
633 fill_len = len;
634 /* !both && !short_only, so we don't need shortname. */
635 if (!both)
636 goto start_filldir;
637
638 short_len = fat_parse_short(sb, de, bufname,
639 sbi->options.dotsOK);
640 if (short_len == 0)
641 goto record_end;
642 /* hack for fat_ioctl_filldir() */
643 both->longname = fill_name;
644 both->long_len = fill_len;
645 both->shortname = bufname;
646 both->short_len = short_len;
647 fill_name = NULL;
648 fill_len = 0;
649 goto start_filldir;
650 }
651 }
652
653 short_len = fat_parse_short(sb, de, bufname, sbi->options.dotsOK);
654 if (short_len == 0)
655 goto record_end;
656
657 fill_name = bufname;
658 fill_len = short_len;
659
660 start_filldir:
661 if (!fake_offset)
662 ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry);
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;
670 } else {
671 unsigned long inum;
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);
679 if (!dir_emit(ctx, fill_name, fill_len, inum,
680 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG))
681 goto fill_failed;
682 }
683
684 record_end:
685 fake_offset = 0;
686 ctx->pos = cpos;
687 goto get_new;
688 end_of_dir:
689 ctx->pos = cpos;
690 fill_failed:
691 brelse(bh);
692 if (unicode)
693 __putname(unicode);
694 out:
695 mutex_unlock(&sbi->s_lock);
696 return ret;
697 }
698
699 static int fat_readdir(struct file *file, struct dir_context *ctx)
700 {
701 return __fat_readdir(file_inode(file), file, ctx, 0, NULL);
702 }
703
704 #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \
705 static int func(void *__buf, const char *name, int name_len, \
706 loff_t offset, u64 ino, unsigned int d_type) \
707 { \
708 struct fat_ioctl_filldir_callback *buf = __buf; \
709 struct dirent_type __user *d1 = buf->dirent; \
710 struct dirent_type __user *d2 = d1 + 1; \
711 \
712 if (buf->result) \
713 return -EINVAL; \
714 buf->result++; \
715 \
716 if (name != NULL) { \
717 /* dirent has only short name */ \
718 if (name_len >= sizeof(d1->d_name)) \
719 name_len = sizeof(d1->d_name) - 1; \
720 \
721 if (put_user(0, d2->d_name) || \
722 put_user(0, &d2->d_reclen) || \
723 copy_to_user(d1->d_name, name, name_len) || \
724 put_user(0, d1->d_name + name_len) || \
725 put_user(name_len, &d1->d_reclen)) \
726 goto efault; \
727 } else { \
728 /* dirent has short and long name */ \
729 const char *longname = buf->longname; \
730 int long_len = buf->long_len; \
731 const char *shortname = buf->shortname; \
732 int short_len = buf->short_len; \
733 \
734 if (long_len >= sizeof(d1->d_name)) \
735 long_len = sizeof(d1->d_name) - 1; \
736 if (short_len >= sizeof(d1->d_name)) \
737 short_len = sizeof(d1->d_name) - 1; \
738 \
739 if (copy_to_user(d2->d_name, longname, long_len) || \
740 put_user(0, d2->d_name + long_len) || \
741 put_user(long_len, &d2->d_reclen) || \
742 put_user(ino, &d2->d_ino) || \
743 put_user(offset, &d2->d_off) || \
744 copy_to_user(d1->d_name, shortname, short_len) || \
745 put_user(0, d1->d_name + short_len) || \
746 put_user(short_len, &d1->d_reclen)) \
747 goto efault; \
748 } \
749 return 0; \
750 efault: \
751 buf->result = -EFAULT; \
752 return -EFAULT; \
753 }
754
755 FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent)
756
757 static int fat_ioctl_readdir(struct inode *inode, struct file *file,
758 void __user *dirent, filldir_t filldir,
759 int short_only, int both)
760 {
761 struct fat_ioctl_filldir_callback buf = {
762 .ctx.actor = filldir,
763 .dirent = dirent
764 };
765 int ret;
766
767 buf.dirent = dirent;
768 buf.result = 0;
769 mutex_lock(&inode->i_mutex);
770 buf.ctx.pos = file->f_pos;
771 ret = -ENOENT;
772 if (!IS_DEADDIR(inode)) {
773 ret = __fat_readdir(inode, file, &buf.ctx,
774 short_only, both ? &buf : NULL);
775 file->f_pos = buf.ctx.pos;
776 }
777 mutex_unlock(&inode->i_mutex);
778 if (ret >= 0)
779 ret = buf.result;
780 return ret;
781 }
782
783 static long fat_dir_ioctl(struct file *filp, unsigned int cmd,
784 unsigned long arg)
785 {
786 struct inode *inode = file_inode(filp);
787 struct __fat_dirent __user *d1 = (struct __fat_dirent __user *)arg;
788 int short_only, both;
789
790 switch (cmd) {
791 case VFAT_IOCTL_READDIR_SHORT:
792 short_only = 1;
793 both = 0;
794 break;
795 case VFAT_IOCTL_READDIR_BOTH:
796 short_only = 0;
797 both = 1;
798 break;
799 default:
800 return fat_generic_ioctl(filp, cmd, arg);
801 }
802
803 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct __fat_dirent[2])))
804 return -EFAULT;
805 /*
806 * Yes, we don't need this put_user() absolutely. However old
807 * code didn't return the right value. So, app use this value,
808 * in order to check whether it is EOF.
809 */
810 if (put_user(0, &d1->d_reclen))
811 return -EFAULT;
812
813 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir,
814 short_only, both);
815 }
816
817 #ifdef CONFIG_COMPAT
818 #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2])
819 #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2])
820
821 FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent)
822
823 static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
824 unsigned long arg)
825 {
826 struct inode *inode = file_inode(filp);
827 struct compat_dirent __user *d1 = compat_ptr(arg);
828 int short_only, both;
829
830 switch (cmd) {
831 case VFAT_IOCTL_READDIR_SHORT32:
832 short_only = 1;
833 both = 0;
834 break;
835 case VFAT_IOCTL_READDIR_BOTH32:
836 short_only = 0;
837 both = 1;
838 break;
839 default:
840 return fat_generic_ioctl(filp, cmd, (unsigned long)arg);
841 }
842
843 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2])))
844 return -EFAULT;
845 /*
846 * Yes, we don't need this put_user() absolutely. However old
847 * code didn't return the right value. So, app use this value,
848 * in order to check whether it is EOF.
849 */
850 if (put_user(0, &d1->d_reclen))
851 return -EFAULT;
852
853 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir,
854 short_only, both);
855 }
856 #endif /* CONFIG_COMPAT */
857
858 const struct file_operations fat_dir_operations = {
859 .llseek = generic_file_llseek,
860 .read = generic_read_dir,
861 .iterate = fat_readdir,
862 .unlocked_ioctl = fat_dir_ioctl,
863 #ifdef CONFIG_COMPAT
864 .compat_ioctl = fat_compat_dir_ioctl,
865 #endif
866 .fsync = fat_file_fsync,
867 };
868
869 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
870 struct buffer_head **bh,
871 struct msdos_dir_entry **de)
872 {
873 while (fat_get_entry(dir, pos, bh, de) >= 0) {
874 /* free entry or long name entry or volume label */
875 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
876 return 0;
877 }
878 return -ENOENT;
879 }
880
881 /*
882 * The ".." entry can not provide the "struct fat_slot_info" information
883 * for inode, nor a usable i_pos. So, this function provides some information
884 * only.
885 *
886 * Since this function walks through the on-disk inodes within a directory,
887 * callers are responsible for taking any locks necessary to prevent the
888 * directory from changing.
889 */
890 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
891 struct msdos_dir_entry **de)
892 {
893 loff_t offset = 0;
894
895 *de = NULL;
896 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
897 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME))
898 return 0;
899 }
900 return -ENOENT;
901 }
902 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
903
904 /* See if directory is empty */
905 int fat_dir_empty(struct inode *dir)
906 {
907 struct buffer_head *bh;
908 struct msdos_dir_entry *de;
909 loff_t cpos;
910 int result = 0;
911
912 bh = NULL;
913 cpos = 0;
914 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
915 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) &&
916 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
917 result = -ENOTEMPTY;
918 break;
919 }
920 }
921 brelse(bh);
922 return result;
923 }
924 EXPORT_SYMBOL_GPL(fat_dir_empty);
925
926 /*
927 * fat_subdirs counts the number of sub-directories of dir. It can be run
928 * on directories being created.
929 */
930 int fat_subdirs(struct inode *dir)
931 {
932 struct buffer_head *bh;
933 struct msdos_dir_entry *de;
934 loff_t cpos;
935 int count = 0;
936
937 bh = NULL;
938 cpos = 0;
939 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
940 if (de->attr & ATTR_DIR)
941 count++;
942 }
943 brelse(bh);
944 return count;
945 }
946
947 /*
948 * Scans a directory for a given file (name points to its formatted name).
949 * Returns an error code or zero.
950 */
951 int fat_scan(struct inode *dir, const unsigned char *name,
952 struct fat_slot_info *sinfo)
953 {
954 struct super_block *sb = dir->i_sb;
955
956 sinfo->slot_off = 0;
957 sinfo->bh = NULL;
958 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
959 &sinfo->de) >= 0) {
960 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
961 sinfo->slot_off -= sizeof(*sinfo->de);
962 sinfo->nr_slots = 1;
963 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
964 return 0;
965 }
966 }
967 return -ENOENT;
968 }
969 EXPORT_SYMBOL_GPL(fat_scan);
970
971 /*
972 * Scans a directory for a given logstart.
973 * Returns an error code or zero.
974 */
975 int fat_scan_logstart(struct inode *dir, int i_logstart,
976 struct fat_slot_info *sinfo)
977 {
978 struct super_block *sb = dir->i_sb;
979
980 sinfo->slot_off = 0;
981 sinfo->bh = NULL;
982 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
983 &sinfo->de) >= 0) {
984 if (fat_get_start(MSDOS_SB(sb), sinfo->de) == i_logstart) {
985 sinfo->slot_off -= sizeof(*sinfo->de);
986 sinfo->nr_slots = 1;
987 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
988 return 0;
989 }
990 }
991 return -ENOENT;
992 }
993
994 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
995 {
996 struct super_block *sb = dir->i_sb;
997 struct buffer_head *bh;
998 struct msdos_dir_entry *de, *endp;
999 int err = 0, orig_slots;
1000
1001 while (nr_slots) {
1002 bh = NULL;
1003 if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
1004 err = -EIO;
1005 break;
1006 }
1007
1008 orig_slots = nr_slots;
1009 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
1010 while (nr_slots && de < endp) {
1011 de->name[0] = DELETED_FLAG;
1012 de++;
1013 nr_slots--;
1014 }
1015 mark_buffer_dirty_inode(bh, dir);
1016 if (IS_DIRSYNC(dir))
1017 err = sync_dirty_buffer(bh);
1018 brelse(bh);
1019 if (err)
1020 break;
1021
1022 /* pos is *next* de's position, so this does `- sizeof(de)' */
1023 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
1024 }
1025
1026 return err;
1027 }
1028
1029 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
1030 {
1031 struct super_block *sb = dir->i_sb;
1032 struct msdos_dir_entry *de;
1033 struct buffer_head *bh;
1034 int err = 0, nr_slots;
1035
1036 /*
1037 * First stage: Remove the shortname. By this, the directory
1038 * entry is removed.
1039 */
1040 nr_slots = sinfo->nr_slots;
1041 de = sinfo->de;
1042 sinfo->de = NULL;
1043 bh = sinfo->bh;
1044 sinfo->bh = NULL;
1045 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
1046 de->name[0] = DELETED_FLAG;
1047 de--;
1048 nr_slots--;
1049 }
1050 mark_buffer_dirty_inode(bh, dir);
1051 if (IS_DIRSYNC(dir))
1052 err = sync_dirty_buffer(bh);
1053 brelse(bh);
1054 if (err)
1055 return err;
1056 dir->i_version++;
1057
1058 if (nr_slots) {
1059 /*
1060 * Second stage: remove the remaining longname slots.
1061 * (This directory entry is already removed, and so return
1062 * the success)
1063 */
1064 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
1065 if (err) {
1066 fat_msg(sb, KERN_WARNING,
1067 "Couldn't remove the long name slots");
1068 }
1069 }
1070
1071 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
1072 if (IS_DIRSYNC(dir))
1073 (void)fat_sync_inode(dir);
1074 else
1075 mark_inode_dirty(dir);
1076
1077 return 0;
1078 }
1079 EXPORT_SYMBOL_GPL(fat_remove_entries);
1080
1081 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
1082 struct buffer_head **bhs, int nr_bhs)
1083 {
1084 struct super_block *sb = dir->i_sb;
1085 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
1086 int err, i, n;
1087
1088 /* Zeroing the unused blocks on this cluster */
1089 blknr += nr_used;
1090 n = nr_used;
1091 while (blknr < last_blknr) {
1092 bhs[n] = sb_getblk(sb, blknr);
1093 if (!bhs[n]) {
1094 err = -ENOMEM;
1095 goto error;
1096 }
1097 memset(bhs[n]->b_data, 0, sb->s_blocksize);
1098 set_buffer_uptodate(bhs[n]);
1099 mark_buffer_dirty_inode(bhs[n], dir);
1100
1101 n++;
1102 blknr++;
1103 if (n == nr_bhs) {
1104 if (IS_DIRSYNC(dir)) {
1105 err = fat_sync_bhs(bhs, n);
1106 if (err)
1107 goto error;
1108 }
1109 for (i = 0; i < n; i++)
1110 brelse(bhs[i]);
1111 n = 0;
1112 }
1113 }
1114 if (IS_DIRSYNC(dir)) {
1115 err = fat_sync_bhs(bhs, n);
1116 if (err)
1117 goto error;
1118 }
1119 for (i = 0; i < n; i++)
1120 brelse(bhs[i]);
1121
1122 return 0;
1123
1124 error:
1125 for (i = 0; i < n; i++)
1126 bforget(bhs[i]);
1127 return err;
1128 }
1129
1130 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
1131 {
1132 struct super_block *sb = dir->i_sb;
1133 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1134 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1135 struct msdos_dir_entry *de;
1136 sector_t blknr;
1137 __le16 date, time;
1138 u8 time_cs;
1139 int err, cluster;
1140
1141 err = fat_alloc_clusters(dir, &cluster, 1);
1142 if (err)
1143 goto error;
1144
1145 blknr = fat_clus_to_blknr(sbi, cluster);
1146 bhs[0] = sb_getblk(sb, blknr);
1147 if (!bhs[0]) {
1148 err = -ENOMEM;
1149 goto error_free;
1150 }
1151
1152 fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
1153
1154 de = (struct msdos_dir_entry *)bhs[0]->b_data;
1155 /* filling the new directory slots ("." and ".." entries) */
1156 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
1157 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
1158 de->attr = de[1].attr = ATTR_DIR;
1159 de[0].lcase = de[1].lcase = 0;
1160 de[0].time = de[1].time = time;
1161 de[0].date = de[1].date = date;
1162 if (sbi->options.isvfat) {
1163 /* extra timestamps */
1164 de[0].ctime = de[1].ctime = time;
1165 de[0].ctime_cs = de[1].ctime_cs = time_cs;
1166 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
1167 } else {
1168 de[0].ctime = de[1].ctime = 0;
1169 de[0].ctime_cs = de[1].ctime_cs = 0;
1170 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
1171 }
1172 fat_set_start(&de[0], cluster);
1173 fat_set_start(&de[1], MSDOS_I(dir)->i_logstart);
1174 de[0].size = de[1].size = 0;
1175 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
1176 set_buffer_uptodate(bhs[0]);
1177 mark_buffer_dirty_inode(bhs[0], dir);
1178
1179 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
1180 if (err)
1181 goto error_free;
1182
1183 return cluster;
1184
1185 error_free:
1186 fat_free_clusters(dir, cluster);
1187 error:
1188 return err;
1189 }
1190 EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
1191
1192 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
1193 int *nr_cluster, struct msdos_dir_entry **de,
1194 struct buffer_head **bh, loff_t *i_pos)
1195 {
1196 struct super_block *sb = dir->i_sb;
1197 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1198 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1199 sector_t blknr, start_blknr, last_blknr;
1200 unsigned long size, copy;
1201 int err, i, n, offset, cluster[2];
1202
1203 /*
1204 * The minimum cluster size is 512bytes, and maximum entry
1205 * size is 32*slots (672bytes). So, iff the cluster size is
1206 * 512bytes, we may need two clusters.
1207 */
1208 size = nr_slots * sizeof(struct msdos_dir_entry);
1209 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
1210 BUG_ON(*nr_cluster > 2);
1211
1212 err = fat_alloc_clusters(dir, cluster, *nr_cluster);
1213 if (err)
1214 goto error;
1215
1216 /*
1217 * First stage: Fill the directory entry. NOTE: This cluster
1218 * is not referenced from any inode yet, so updates order is
1219 * not important.
1220 */
1221 i = n = copy = 0;
1222 do {
1223 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
1224 last_blknr = start_blknr + sbi->sec_per_clus;
1225 while (blknr < last_blknr) {
1226 bhs[n] = sb_getblk(sb, blknr);
1227 if (!bhs[n]) {
1228 err = -ENOMEM;
1229 goto error_nomem;
1230 }
1231
1232 /* fill the directory entry */
1233 copy = min(size, sb->s_blocksize);
1234 memcpy(bhs[n]->b_data, slots, copy);
1235 slots += copy;
1236 size -= copy;
1237 set_buffer_uptodate(bhs[n]);
1238 mark_buffer_dirty_inode(bhs[n], dir);
1239 if (!size)
1240 break;
1241 n++;
1242 blknr++;
1243 }
1244 } while (++i < *nr_cluster);
1245
1246 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
1247 offset = copy - sizeof(struct msdos_dir_entry);
1248 get_bh(bhs[n]);
1249 *bh = bhs[n];
1250 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
1251 *i_pos = fat_make_i_pos(sb, *bh, *de);
1252
1253 /* Second stage: clear the rest of cluster, and write outs */
1254 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
1255 if (err)
1256 goto error_free;
1257
1258 return cluster[0];
1259
1260 error_free:
1261 brelse(*bh);
1262 *bh = NULL;
1263 n = 0;
1264 error_nomem:
1265 for (i = 0; i < n; i++)
1266 bforget(bhs[i]);
1267 fat_free_clusters(dir, cluster[0]);
1268 error:
1269 return err;
1270 }
1271
1272 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
1273 struct fat_slot_info *sinfo)
1274 {
1275 struct super_block *sb = dir->i_sb;
1276 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1277 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
1278 struct msdos_dir_entry *uninitialized_var(de);
1279 int err, free_slots, i, nr_bhs;
1280 loff_t pos, i_pos;
1281
1282 sinfo->nr_slots = nr_slots;
1283
1284 /* First stage: search free directory entries */
1285 free_slots = nr_bhs = 0;
1286 bh = prev = NULL;
1287 pos = 0;
1288 err = -ENOSPC;
1289 while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
1290 /* check the maximum size of directory */
1291 if (pos >= FAT_MAX_DIR_SIZE)
1292 goto error;
1293
1294 if (IS_FREE(de->name)) {
1295 if (prev != bh) {
1296 get_bh(bh);
1297 bhs[nr_bhs] = prev = bh;
1298 nr_bhs++;
1299 }
1300 free_slots++;
1301 if (free_slots == nr_slots)
1302 goto found;
1303 } else {
1304 for (i = 0; i < nr_bhs; i++)
1305 brelse(bhs[i]);
1306 prev = NULL;
1307 free_slots = nr_bhs = 0;
1308 }
1309 }
1310 if (dir->i_ino == MSDOS_ROOT_INO) {
1311 if (sbi->fat_bits != 32)
1312 goto error;
1313 } else if (MSDOS_I(dir)->i_start == 0) {
1314 fat_msg(sb, KERN_ERR, "Corrupted directory (i_pos %lld)",
1315 MSDOS_I(dir)->i_pos);
1316 err = -EIO;
1317 goto error;
1318 }
1319
1320 found:
1321 err = 0;
1322 pos -= free_slots * sizeof(*de);
1323 nr_slots -= free_slots;
1324 if (free_slots) {
1325 /*
1326 * Second stage: filling the free entries with new entries.
1327 * NOTE: If this slots has shortname, first, we write
1328 * the long name slots, then write the short name.
1329 */
1330 int size = free_slots * sizeof(*de);
1331 int offset = pos & (sb->s_blocksize - 1);
1332 int long_bhs = nr_bhs - (nr_slots == 0);
1333
1334 /* Fill the long name slots. */
1335 for (i = 0; i < long_bhs; i++) {
1336 int copy = min_t(int, sb->s_blocksize - offset, size);
1337 memcpy(bhs[i]->b_data + offset, slots, copy);
1338 mark_buffer_dirty_inode(bhs[i], dir);
1339 offset = 0;
1340 slots += copy;
1341 size -= copy;
1342 }
1343 if (long_bhs && IS_DIRSYNC(dir))
1344 err = fat_sync_bhs(bhs, long_bhs);
1345 if (!err && i < nr_bhs) {
1346 /* Fill the short name slot. */
1347 int copy = min_t(int, sb->s_blocksize - offset, size);
1348 memcpy(bhs[i]->b_data + offset, slots, copy);
1349 mark_buffer_dirty_inode(bhs[i], dir);
1350 if (IS_DIRSYNC(dir))
1351 err = sync_dirty_buffer(bhs[i]);
1352 }
1353 for (i = 0; i < nr_bhs; i++)
1354 brelse(bhs[i]);
1355 if (err)
1356 goto error_remove;
1357 }
1358
1359 if (nr_slots) {
1360 int cluster, nr_cluster;
1361
1362 /*
1363 * Third stage: allocate the cluster for new entries.
1364 * And initialize the cluster with new entries, then
1365 * add the cluster to dir.
1366 */
1367 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
1368 &de, &bh, &i_pos);
1369 if (cluster < 0) {
1370 err = cluster;
1371 goto error_remove;
1372 }
1373 err = fat_chain_add(dir, cluster, nr_cluster);
1374 if (err) {
1375 fat_free_clusters(dir, cluster);
1376 goto error_remove;
1377 }
1378 if (dir->i_size & (sbi->cluster_size - 1)) {
1379 fat_fs_error(sb, "Odd directory size");
1380 dir->i_size = (dir->i_size + sbi->cluster_size - 1)
1381 & ~((loff_t)sbi->cluster_size - 1);
1382 }
1383 dir->i_size += nr_cluster << sbi->cluster_bits;
1384 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
1385 }
1386 sinfo->slot_off = pos;
1387 sinfo->de = de;
1388 sinfo->bh = bh;
1389 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
1390
1391 return 0;
1392
1393 error:
1394 brelse(bh);
1395 for (i = 0; i < nr_bhs; i++)
1396 brelse(bhs[i]);
1397 return err;
1398
1399 error_remove:
1400 brelse(bh);
1401 if (free_slots)
1402 __fat_remove_entries(dir, pos, free_slots);
1403 return err;
1404 }
1405 EXPORT_SYMBOL_GPL(fat_add_entries);
Linux with added FPC-III support