4 * directory handling functions for fat-based filesystems
6 * Written 1992,1993 by Werner Almesberger
8 * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
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>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/time.h>
19 #include <linux/msdos_fs.h>
20 #include <linux/dirent.h>
21 #include <linux/smp_lock.h>
22 #include <linux/buffer_head.h>
23 #include <linux/compat.h>
24 #include <asm/uaccess.h>
26 static inline loff_t fat_make_i_pos(struct super_block *sb,
27 struct buffer_head *bh,
28 struct msdos_dir_entry *de)
30 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
31 | (de - (struct msdos_dir_entry *)bh->b_data);
34 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
37 struct super_block *sb = dir->i_sb;
38 struct msdos_sb_info *sbi = MSDOS_SB(sb);
39 struct buffer_head *bh;
42 /* This is not a first sector of cluster, or sec_per_clus == 1 */
43 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
45 /* root dir of FAT12/FAT16 */
46 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
49 bh = sb_find_get_block(sb, phys);
50 if (bh == NULL || !buffer_uptodate(bh)) {
51 for (sec = 0; sec < sbi->sec_per_clus; sec++)
52 sb_breadahead(sb, phys + sec);
57 /* Returns the inode number of the directory entry at offset pos. If bh is
58 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
60 AV. Most often we do it item-by-item. Makes sense to optimize.
61 AV. OK, there we go: if both bh and de are non-NULL we assume that we just
62 AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
63 AV. It's done in fat_get_entry() (inlined), here the slow case lives.
64 AV. Additionally, when we return -1 (i.e. reached the end of directory)
67 static int fat__get_entry(struct inode *dir, loff_t *pos,
68 struct buffer_head **bh, struct msdos_dir_entry **de)
70 struct super_block *sb = dir->i_sb;
71 sector_t phys, iblock;
72 unsigned long mapped_blocks;
80 iblock = *pos >> sb->s_blocksize_bits;
81 err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
83 return -1; /* beyond EOF or error */
85 fat_dir_readahead(dir, iblock, phys);
87 *bh = sb_bread(sb, phys);
89 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
90 (unsigned long long)phys);
92 *pos = (iblock + 1) << sb->s_blocksize_bits;
96 offset = *pos & (sb->s_blocksize - 1);
97 *pos += sizeof(struct msdos_dir_entry);
98 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
103 static inline int fat_get_entry(struct inode *dir, loff_t *pos,
104 struct buffer_head **bh,
105 struct msdos_dir_entry **de)
107 /* Fast stuff first */
109 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
110 *pos += sizeof(struct msdos_dir_entry);
114 return fat__get_entry(dir, pos, bh, de);
118 * Convert Unicode 16 to UTF-8, translated Unicode, or ASCII.
119 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
120 * colon as an escape character since it is normally invalid on the vfat
121 * filesystem. The following four characters are the hexadecimal digits
122 * of Unicode value. This lets us do a full dump and restore of Unicode
123 * filenames. We could get into some trouble with long Unicode names,
124 * but ignore that right now.
125 * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
127 static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
128 struct nls_table *nls)
131 unsigned char *op, nc;
140 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
143 if (uni_xlate == 1) {
145 for (k = 4; k > 0; k--) {
147 op[k] = nc > 9 ? nc + ('a' - 10)
156 /* We have some slack there, so it's OK */
167 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
171 charlen = t->char2uni(c, clen, uni);
173 *uni = 0x003f; /* a question mark */
180 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
185 charlen = t->char2uni(c, clen, &wc);
187 *uni = 0x003f; /* a question mark */
189 } else if (charlen <= 1) {
190 unsigned char nc = t->charset2lower[*c];
195 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
196 *uni = 0x003f; /* a question mark */
206 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
207 wchar_t *uni_buf, unsigned short opt, int lower)
211 if (opt & VFAT_SFN_DISPLAY_LOWER)
212 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
213 else if (opt & VFAT_SFN_DISPLAY_WIN95)
214 len = fat_short2uni(nls, buf, buf_size, uni_buf);
215 else if (opt & VFAT_SFN_DISPLAY_WINNT) {
217 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
219 len = fat_short2uni(nls, buf, buf_size, uni_buf);
221 len = fat_short2uni(nls, buf, buf_size, uni_buf);
226 enum { PARSE_INVALID = 1, PARSE_NOT_LONGNAME, PARSE_EOF, };
229 * fat_parse_long - Parse extended directory entry.
231 * This function returns zero on success, negative value on error, or one of
234 * %PARSE_INVALID - Directory entry is invalid.
235 * %PARSE_NOT_LONGNAME - Directory entry does not contain longname.
236 * %PARSE_EOF - Directory has no more entries.
238 static int fat_parse_long(struct inode *dir, loff_t *pos,
239 struct buffer_head **bh, struct msdos_dir_entry **de,
240 wchar_t **unicode, unsigned char *nr_slots)
242 struct msdos_dir_slot *ds;
243 unsigned char id, slot, slots, alias_checksum;
246 *unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
254 ds = (struct msdos_dir_slot *)*de;
257 return PARSE_INVALID;
259 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
260 return PARSE_INVALID;
262 alias_checksum = ds->alias_checksum;
270 fat16_towchar(*unicode + offset, ds->name0_4, 5);
271 fat16_towchar(*unicode + offset + 5, ds->name5_10, 6);
272 fat16_towchar(*unicode + offset + 11, ds->name11_12, 2);
275 (*unicode)[offset + 13] = 0;
276 if (fat_get_entry(dir, pos, bh, de) < 0)
280 ds = (struct msdos_dir_slot *)*de;
281 if (ds->attr != ATTR_EXT)
282 return PARSE_NOT_LONGNAME;
283 if ((ds->id & ~0x40) != slot)
285 if (ds->alias_checksum != alias_checksum)
288 if ((*de)->name[0] == DELETED_FLAG)
289 return PARSE_INVALID;
290 if ((*de)->attr == ATTR_EXT)
292 if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME))
293 return PARSE_INVALID;
294 if (fat_checksum((*de)->name) != alias_checksum)
301 * Return values: negative -> error, 0 -> not found, positive -> found,
302 * value is the total amount of slots, including the shortname entry.
304 int fat_search_long(struct inode *inode, const unsigned char *name,
305 int name_len, struct fat_slot_info *sinfo)
307 struct super_block *sb = inode->i_sb;
308 struct msdos_sb_info *sbi = MSDOS_SB(sb);
309 struct buffer_head *bh = NULL;
310 struct msdos_dir_entry *de;
311 struct nls_table *nls_io = sbi->nls_io;
312 struct nls_table *nls_disk = sbi->nls_disk;
313 wchar_t bufuname[14];
314 unsigned char xlate_len, nr_slots;
315 wchar_t *unicode = NULL;
316 unsigned char work[8], bufname[260]; /* 256 + 4 */
317 int uni_xlate = sbi->options.unicode_xlate;
318 int utf8 = sbi->options.utf8;
319 int anycase = (sbi->options.name_check != 's');
320 unsigned short opt_shortname = sbi->options.shortname;
322 int chl, i, j, last_u, err;
326 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
330 if (de->name[0] == DELETED_FLAG)
332 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
334 if (de->attr != ATTR_EXT && IS_FREE(de->name))
336 if (de->attr == ATTR_EXT) {
337 int status = fat_parse_long(inode, &cpos, &bh, &de,
338 &unicode, &nr_slots);
341 else if (status == PARSE_INVALID)
343 else if (status == PARSE_NOT_LONGNAME)
345 else if (status == PARSE_EOF)
349 memcpy(work, de->name, sizeof(de->name));
350 /* see namei.c, msdos_format_name */
353 for (i = 0, j = 0, last_u = 0; i < 8;) {
355 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
356 &bufuname[j++], opt_shortname,
357 de->lcase & CASE_LOWER_BASE);
367 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
368 for (i = 0; i < 3;) {
369 if (!de->ext[i]) break;
370 chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
371 &bufuname[j++], opt_shortname,
372 de->lcase & CASE_LOWER_EXT);
374 if (de->ext[i] != ' ')
384 bufuname[last_u] = 0x0000;
386 ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
387 :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
388 if (xlate_len == name_len)
389 if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
390 (anycase && !nls_strnicmp(nls_io, name, bufname,
396 ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
397 :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
398 if (xlate_len != name_len)
400 if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
401 (anycase && !nls_strnicmp(nls_io, name, bufname,
408 nr_slots++; /* include the de */
409 sinfo->slot_off = cpos - nr_slots * sizeof(*de);
410 sinfo->nr_slots = nr_slots;
413 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
417 free_page((unsigned long)unicode);
422 EXPORT_SYMBOL_GPL(fat_search_long);
424 struct fat_ioctl_filldir_callback {
428 const char *longname;
430 const char *shortname;
434 static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent,
435 filldir_t filldir, int short_only, int both)
437 struct super_block *sb = inode->i_sb;
438 struct msdos_sb_info *sbi = MSDOS_SB(sb);
439 struct buffer_head *bh;
440 struct msdos_dir_entry *de;
441 struct nls_table *nls_io = sbi->nls_io;
442 struct nls_table *nls_disk = sbi->nls_disk;
443 unsigned char long_slots;
444 const char *fill_name;
446 wchar_t bufuname[14];
447 wchar_t *unicode = NULL;
448 unsigned char c, work[8], bufname[56], *ptname = bufname;
449 unsigned long lpos, dummy, *furrfu = &lpos;
450 int uni_xlate = sbi->options.unicode_xlate;
451 int isvfat = sbi->options.isvfat;
452 int utf8 = sbi->options.utf8;
453 int nocase = sbi->options.nocase;
454 unsigned short opt_shortname = sbi->options.shortname;
456 int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
463 /* Fake . and .. for the root directory. */
464 if (inode->i_ino == MSDOS_ROOT_INO) {
466 if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
477 if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
484 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
488 /* Check for long filename entry */
490 if (de->name[0] == DELETED_FLAG)
492 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
494 if (de->attr != ATTR_EXT && IS_FREE(de->name))
497 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
501 if (isvfat && de->attr == ATTR_EXT) {
502 int status = fat_parse_long(inode, &cpos, &bh, &de,
503 &unicode, &long_slots);
508 } else if (status == PARSE_INVALID)
510 else if (status == PARSE_NOT_LONGNAME)
512 else if (status == PARSE_EOF)
516 if (sbi->options.dotsOK) {
519 if (de->attr & ATTR_HIDDEN) {
525 memcpy(work, de->name, sizeof(de->name));
526 /* see namei.c, msdos_format_name */
529 for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
530 if (!(c = work[i])) break;
531 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
532 &bufuname[j++], opt_shortname,
533 de->lcase & CASE_LOWER_BASE);
535 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
542 for (chi = 0; chi < chl && i < 8; chi++) {
550 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
552 for (i2 = 0; i2 < 3;) {
553 if (!(c = de->ext[i2])) break;
554 chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
555 &bufuname[j++], opt_shortname,
556 de->lcase & CASE_LOWER_EXT);
559 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
566 for (chi = 0; chi < chl && i2 < 3; chi++) {
567 ptname[i++] = de->ext[i2++];
575 i = last + dotoffset;
578 lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
579 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
581 else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
582 inum = parent_ino(filp->f_path.dentry);
584 loff_t i_pos = fat_make_i_pos(sb, bh, de);
585 struct inode *tmp = fat_iget(sb, i_pos);
590 inum = iunique(sb, MSDOS_ROOT_INO);
594 bufuname[j] = 0x0000;
595 i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
596 : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
601 if (!short_only && long_slots) {
602 /* convert the unicode long name. 261 is maximum size
603 * of unicode buffer. (13 * slots + nul) */
604 void *longname = unicode + 261;
605 int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
607 ? utf8_wcstombs(longname, unicode, buf_size)
608 : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
611 fill_name = longname;
614 /* hack for fat_ioctl_filldir() */
615 struct fat_ioctl_filldir_callback *p = dirent;
617 p->longname = longname;
618 p->long_len = long_len;
619 p->shortname = bufname;
625 if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
626 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
638 free_page((unsigned long)unicode);
644 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
646 struct inode *inode = filp->f_path.dentry->d_inode;
647 return __fat_readdir(inode, filp, dirent, filldir, 0, 0);
650 #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \
651 static int func(void *__buf, const char *name, int name_len, \
652 loff_t offset, u64 ino, unsigned int d_type) \
654 struct fat_ioctl_filldir_callback *buf = __buf; \
655 struct dirent_type __user *d1 = buf->dirent; \
656 struct dirent_type __user *d2 = d1 + 1; \
662 if (name != NULL) { \
663 /* dirent has only short name */ \
664 if (name_len >= sizeof(d1->d_name)) \
665 name_len = sizeof(d1->d_name) - 1; \
667 if (put_user(0, d2->d_name) || \
668 put_user(0, &d2->d_reclen) || \
669 copy_to_user(d1->d_name, name, name_len) || \
670 put_user(0, d1->d_name + name_len) || \
671 put_user(name_len, &d1->d_reclen)) \
674 /* dirent has short and long name */ \
675 const char *longname = buf->longname; \
676 int long_len = buf->long_len; \
677 const char *shortname = buf->shortname; \
678 int short_len = buf->short_len; \
680 if (long_len >= sizeof(d1->d_name)) \
681 long_len = sizeof(d1->d_name) - 1; \
682 if (short_len >= sizeof(d1->d_name)) \
683 short_len = sizeof(d1->d_name) - 1; \
685 if (copy_to_user(d2->d_name, longname, long_len) || \
686 put_user(0, d2->d_name + long_len) || \
687 put_user(long_len, &d2->d_reclen) || \
688 put_user(ino, &d2->d_ino) || \
689 put_user(offset, &d2->d_off) || \
690 copy_to_user(d1->d_name, shortname, short_len) || \
691 put_user(0, d1->d_name + short_len) || \
692 put_user(short_len, &d1->d_reclen)) \
697 buf->result = -EFAULT; \
701 FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, dirent)
703 static int fat_ioctl_readdir(struct inode *inode, struct file *filp,
704 void __user *dirent, filldir_t filldir,
705 int short_only, int both)
707 struct fat_ioctl_filldir_callback buf;
712 mutex_lock(&inode->i_mutex);
714 if (!IS_DEADDIR(inode)) {
715 ret = __fat_readdir(inode, filp, &buf, filldir,
718 mutex_unlock(&inode->i_mutex);
724 static int fat_dir_ioctl(struct inode *inode, struct file *filp,
725 unsigned int cmd, unsigned long arg)
727 struct dirent __user *d1 = (struct dirent __user *)arg;
728 int short_only, both;
731 case VFAT_IOCTL_READDIR_SHORT:
735 case VFAT_IOCTL_READDIR_BOTH:
740 return fat_generic_ioctl(inode, filp, cmd, arg);
743 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
746 * Yes, we don't need this put_user() absolutely. However old
747 * code didn't return the right value. So, app use this value,
748 * in order to check whether it is EOF.
750 if (put_user(0, &d1->d_reclen))
753 return fat_ioctl_readdir(inode, filp, d1, fat_ioctl_filldir,
758 #define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2])
759 #define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2])
761 FAT_IOCTL_FILLDIR_FUNC(fat_compat_ioctl_filldir, compat_dirent)
763 static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd,
766 struct inode *inode = filp->f_path.dentry->d_inode;
767 struct compat_dirent __user *d1 = compat_ptr(arg);
768 int short_only, both;
771 case VFAT_IOCTL_READDIR_SHORT32:
775 case VFAT_IOCTL_READDIR_BOTH32:
783 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct compat_dirent[2])))
786 * Yes, we don't need this put_user() absolutely. However old
787 * code didn't return the right value. So, app use this value,
788 * in order to check whether it is EOF.
790 if (put_user(0, &d1->d_reclen))
793 return fat_ioctl_readdir(inode, filp, d1, fat_compat_ioctl_filldir,
796 #endif /* CONFIG_COMPAT */
798 const struct file_operations fat_dir_operations = {
799 .read = generic_read_dir,
800 .readdir = fat_readdir,
801 .ioctl = fat_dir_ioctl,
803 .compat_ioctl = fat_compat_dir_ioctl,
808 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
809 struct buffer_head **bh,
810 struct msdos_dir_entry **de)
812 while (fat_get_entry(dir, pos, bh, de) >= 0) {
813 /* free entry or long name entry or volume label */
814 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
821 * The ".." entry can not provide the "struct fat_slot_info" informations
822 * for inode. So, this function provide the some informations only.
824 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
825 struct msdos_dir_entry **de, loff_t *i_pos)
831 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
832 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
833 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
840 EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
842 /* See if directory is empty */
843 int fat_dir_empty(struct inode *dir)
845 struct buffer_head *bh;
846 struct msdos_dir_entry *de;
852 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
853 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) &&
854 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
863 EXPORT_SYMBOL_GPL(fat_dir_empty);
866 * fat_subdirs counts the number of sub-directories of dir. It can be run
867 * on directories being created.
869 int fat_subdirs(struct inode *dir)
871 struct buffer_head *bh;
872 struct msdos_dir_entry *de;
878 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
879 if (de->attr & ATTR_DIR)
887 * Scans a directory for a given file (name points to its formatted name).
888 * Returns an error code or zero.
890 int fat_scan(struct inode *dir, const unsigned char *name,
891 struct fat_slot_info *sinfo)
893 struct super_block *sb = dir->i_sb;
897 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
899 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
900 sinfo->slot_off -= sizeof(*sinfo->de);
902 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
909 EXPORT_SYMBOL_GPL(fat_scan);
911 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
913 struct super_block *sb = dir->i_sb;
914 struct buffer_head *bh;
915 struct msdos_dir_entry *de, *endp;
916 int err = 0, orig_slots;
920 if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
925 orig_slots = nr_slots;
926 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
927 while (nr_slots && de < endp) {
928 de->name[0] = DELETED_FLAG;
932 mark_buffer_dirty(bh);
934 err = sync_dirty_buffer(bh);
939 /* pos is *next* de's position, so this does `- sizeof(de)' */
940 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
946 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
948 struct msdos_dir_entry *de;
949 struct buffer_head *bh;
950 int err = 0, nr_slots;
953 * First stage: Remove the shortname. By this, the directory
956 nr_slots = sinfo->nr_slots;
961 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
962 de->name[0] = DELETED_FLAG;
966 mark_buffer_dirty(bh);
968 err = sync_dirty_buffer(bh);
976 * Second stage: remove the remaining longname slots.
977 * (This directory entry is already removed, and so return
980 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
983 "FAT: Couldn't remove the long name slots\n");
987 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
989 (void)fat_sync_inode(dir);
991 mark_inode_dirty(dir);
996 EXPORT_SYMBOL_GPL(fat_remove_entries);
998 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
999 struct buffer_head **bhs, int nr_bhs)
1001 struct super_block *sb = dir->i_sb;
1002 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
1005 /* Zeroing the unused blocks on this cluster */
1008 while (blknr < last_blknr) {
1009 bhs[n] = sb_getblk(sb, blknr);
1014 memset(bhs[n]->b_data, 0, sb->s_blocksize);
1015 set_buffer_uptodate(bhs[n]);
1016 mark_buffer_dirty(bhs[n]);
1021 if (IS_DIRSYNC(dir)) {
1022 err = fat_sync_bhs(bhs, n);
1026 for (i = 0; i < n; i++)
1031 if (IS_DIRSYNC(dir)) {
1032 err = fat_sync_bhs(bhs, n);
1036 for (i = 0; i < n; i++)
1042 for (i = 0; i < n; i++)
1047 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
1049 struct super_block *sb = dir->i_sb;
1050 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1051 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1052 struct msdos_dir_entry *de;
1057 err = fat_alloc_clusters(dir, &cluster, 1);
1061 blknr = fat_clus_to_blknr(sbi, cluster);
1062 bhs[0] = sb_getblk(sb, blknr);
1068 fat_date_unix2dos(ts->tv_sec, &time, &date);
1070 de = (struct msdos_dir_entry *)bhs[0]->b_data;
1071 /* filling the new directory slots ("." and ".." entries) */
1072 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
1073 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
1074 de->attr = de[1].attr = ATTR_DIR;
1075 de[0].lcase = de[1].lcase = 0;
1076 de[0].time = de[1].time = time;
1077 de[0].date = de[1].date = date;
1078 de[0].ctime_cs = de[1].ctime_cs = 0;
1079 if (sbi->options.isvfat) {
1080 /* extra timestamps */
1081 de[0].ctime = de[1].ctime = time;
1082 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
1084 de[0].ctime = de[1].ctime = 0;
1085 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
1087 de[0].start = cpu_to_le16(cluster);
1088 de[0].starthi = cpu_to_le16(cluster >> 16);
1089 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
1090 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
1091 de[0].size = de[1].size = 0;
1092 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
1093 set_buffer_uptodate(bhs[0]);
1094 mark_buffer_dirty(bhs[0]);
1096 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
1103 fat_free_clusters(dir, cluster);
1108 EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
1110 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
1111 int *nr_cluster, struct msdos_dir_entry **de,
1112 struct buffer_head **bh, loff_t *i_pos)
1114 struct super_block *sb = dir->i_sb;
1115 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1116 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1117 sector_t blknr, start_blknr, last_blknr;
1118 unsigned long size, copy;
1119 int err, i, n, offset, cluster[2];
1122 * The minimum cluster size is 512bytes, and maximum entry
1123 * size is 32*slots (672bytes). So, iff the cluster size is
1124 * 512bytes, we may need two clusters.
1126 size = nr_slots * sizeof(struct msdos_dir_entry);
1127 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
1128 BUG_ON(*nr_cluster > 2);
1130 err = fat_alloc_clusters(dir, cluster, *nr_cluster);
1135 * First stage: Fill the directory entry. NOTE: This cluster
1136 * is not referenced from any inode yet, so updates order is
1141 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
1142 last_blknr = start_blknr + sbi->sec_per_clus;
1143 while (blknr < last_blknr) {
1144 bhs[n] = sb_getblk(sb, blknr);
1150 /* fill the directory entry */
1151 copy = min(size, sb->s_blocksize);
1152 memcpy(bhs[n]->b_data, slots, copy);
1155 set_buffer_uptodate(bhs[n]);
1156 mark_buffer_dirty(bhs[n]);
1162 } while (++i < *nr_cluster);
1164 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
1165 offset = copy - sizeof(struct msdos_dir_entry);
1168 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
1169 *i_pos = fat_make_i_pos(sb, *bh, *de);
1171 /* Second stage: clear the rest of cluster, and write outs */
1172 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
1183 for (i = 0; i < n; i++)
1185 fat_free_clusters(dir, cluster[0]);
1190 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
1191 struct fat_slot_info *sinfo)
1193 struct super_block *sb = dir->i_sb;
1194 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1195 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
1196 struct msdos_dir_entry *de;
1197 int err, free_slots, i, nr_bhs;
1200 sinfo->nr_slots = nr_slots;
1202 /* First stage: search free direcotry entries */
1203 free_slots = nr_bhs = 0;
1207 while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
1208 /* check the maximum size of directory */
1209 if (pos >= FAT_MAX_DIR_SIZE)
1212 if (IS_FREE(de->name)) {
1215 bhs[nr_bhs] = prev = bh;
1219 if (free_slots == nr_slots)
1222 for (i = 0; i < nr_bhs; i++)
1225 free_slots = nr_bhs = 0;
1228 if (dir->i_ino == MSDOS_ROOT_INO) {
1229 if (sbi->fat_bits != 32)
1231 } else if (MSDOS_I(dir)->i_start == 0) {
1232 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
1233 MSDOS_I(dir)->i_pos);
1240 pos -= free_slots * sizeof(*de);
1241 nr_slots -= free_slots;
1244 * Second stage: filling the free entries with new entries.
1245 * NOTE: If this slots has shortname, first, we write
1246 * the long name slots, then write the short name.
1248 int size = free_slots * sizeof(*de);
1249 int offset = pos & (sb->s_blocksize - 1);
1250 int long_bhs = nr_bhs - (nr_slots == 0);
1252 /* Fill the long name slots. */
1253 for (i = 0; i < long_bhs; i++) {
1254 int copy = min_t(int, sb->s_blocksize - offset, size);
1255 memcpy(bhs[i]->b_data + offset, slots, copy);
1256 mark_buffer_dirty(bhs[i]);
1261 if (long_bhs && IS_DIRSYNC(dir))
1262 err = fat_sync_bhs(bhs, long_bhs);
1263 if (!err && i < nr_bhs) {
1264 /* Fill the short name slot. */
1265 int copy = min_t(int, sb->s_blocksize - offset, size);
1266 memcpy(bhs[i]->b_data + offset, slots, copy);
1267 mark_buffer_dirty(bhs[i]);
1268 if (IS_DIRSYNC(dir))
1269 err = sync_dirty_buffer(bhs[i]);
1271 for (i = 0; i < nr_bhs; i++)
1278 int cluster, nr_cluster;
1281 * Third stage: allocate the cluster for new entries.
1282 * And initialize the cluster with new entries, then
1283 * add the cluster to dir.
1285 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
1291 err = fat_chain_add(dir, cluster, nr_cluster);
1293 fat_free_clusters(dir, cluster);
1296 if (dir->i_size & (sbi->cluster_size - 1)) {
1297 fat_fs_panic(sb, "Odd directory size");
1298 dir->i_size = (dir->i_size + sbi->cluster_size - 1)
1299 & ~((loff_t)sbi->cluster_size - 1);
1301 dir->i_size += nr_cluster << sbi->cluster_bits;
1302 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
1304 sinfo->slot_off = pos;
1307 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
1313 for (i = 0; i < nr_bhs; i++)
1320 __fat_remove_entries(dir, pos, free_slots);
1324 EXPORT_SYMBOL_GPL(fat_add_entries);