4 * directory handling functions for fat-based filesystems
6 * Written 1992,1993 by Werner Almesberger
12 * Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
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 <asm/uaccess.h>
25 static inline loff_t fat_make_i_pos(struct super_block *sb,
26 struct buffer_head *bh,
27 struct msdos_dir_entry *de)
29 return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
30 | (de - (struct msdos_dir_entry *)bh->b_data);
33 /* Returns the inode number of the directory entry at offset pos. If bh is
34 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
36 AV. Most often we do it item-by-item. Makes sense to optimize.
37 AV. OK, there we go: if both bh and de are non-NULL we assume that we just
38 AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
39 AV. It's done in fat_get_entry() (inlined), here the slow case lives.
40 AV. Additionally, when we return -1 (i.e. reached the end of directory)
43 static int fat__get_entry(struct inode *dir, loff_t *pos,
44 struct buffer_head **bh, struct msdos_dir_entry **de)
46 struct super_block *sb = dir->i_sb;
47 sector_t phys, iblock;
56 iblock = *pos >> sb->s_blocksize_bits;
57 err = fat_bmap(dir, iblock, &phys);
59 return -1; /* beyond EOF or error */
61 *bh = sb_bread(sb, phys);
63 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
64 (unsigned long long)phys);
66 *pos = (iblock + 1) << sb->s_blocksize_bits;
70 offset = *pos & (sb->s_blocksize - 1);
71 *pos += sizeof(struct msdos_dir_entry);
72 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
77 static inline int fat_get_entry(struct inode *dir, loff_t *pos,
78 struct buffer_head **bh,
79 struct msdos_dir_entry **de)
81 /* Fast stuff first */
83 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
84 *pos += sizeof(struct msdos_dir_entry);
88 return fat__get_entry(dir, pos, bh, de);
92 * Convert Unicode 16 to UTF8, translated Unicode, or ASCII.
93 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
94 * colon as an escape character since it is normally invalid on the vfat
95 * filesystem. The following four characters are the hexadecimal digits
96 * of Unicode value. This lets us do a full dump and restore of Unicode
97 * filenames. We could get into some trouble with long Unicode names,
98 * but ignore that right now.
99 * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
101 static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
102 struct nls_table *nls)
105 unsigned char *op, nc;
114 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
117 if (uni_xlate == 1) {
119 for (k = 4; k > 0; k--) {
121 op[k] = nc > 9 ? nc + ('a' - 10)
130 /* We have some slack there, so it's OK */
141 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
145 charlen = t->char2uni(c, clen, uni);
147 *uni = 0x003f; /* a question mark */
154 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
159 charlen = t->char2uni(c, clen, &wc);
161 *uni = 0x003f; /* a question mark */
163 } else if (charlen <= 1) {
164 unsigned char nc = t->charset2lower[*c];
169 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
170 *uni = 0x003f; /* a question mark */
180 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
181 wchar_t *uni_buf, unsigned short opt, int lower)
185 if (opt & VFAT_SFN_DISPLAY_LOWER)
186 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
187 else if (opt & VFAT_SFN_DISPLAY_WIN95)
188 len = fat_short2uni(nls, buf, buf_size, uni_buf);
189 else if (opt & VFAT_SFN_DISPLAY_WINNT) {
191 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
193 len = fat_short2uni(nls, buf, buf_size, uni_buf);
195 len = fat_short2uni(nls, buf, buf_size, uni_buf);
201 * Return values: negative -> error, 0 -> not found, positive -> found,
202 * value is the total amount of slots, including the shortname entry.
204 int fat_search_long(struct inode *inode, const unsigned char *name,
205 int name_len, struct fat_slot_info *sinfo)
207 struct super_block *sb = inode->i_sb;
208 struct msdos_sb_info *sbi = MSDOS_SB(sb);
209 struct buffer_head *bh = NULL;
210 struct msdos_dir_entry *de;
211 struct nls_table *nls_io = sbi->nls_io;
212 struct nls_table *nls_disk = sbi->nls_disk;
213 wchar_t bufuname[14];
214 unsigned char xlate_len, nr_slots;
215 wchar_t *unicode = NULL;
216 unsigned char work[8], bufname[260]; /* 256 + 4 */
217 int uni_xlate = sbi->options.unicode_xlate;
218 int utf8 = sbi->options.utf8;
219 int anycase = (sbi->options.name_check != 's');
220 unsigned short opt_shortname = sbi->options.shortname;
222 int chl, i, j, last_u, err;
226 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
230 if (de->name[0] == DELETED_FLAG)
232 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
234 if (de->attr != ATTR_EXT && IS_FREE(de->name))
236 if (de->attr == ATTR_EXT) {
237 struct msdos_dir_slot *ds;
242 unsigned char alias_checksum;
245 unicode = (wchar_t *)
246 __get_free_page(GFP_KERNEL);
254 ds = (struct msdos_dir_slot *) de;
259 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
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;
277 if (fat_get_entry(inode, &cpos, &bh, &de) < 0)
281 ds = (struct msdos_dir_slot *) de;
282 if (ds->attr != ATTR_EXT)
284 if ((ds->id & ~0x40) != slot)
286 if (ds->alias_checksum != alias_checksum)
289 if (de->name[0] == DELETED_FLAG)
291 if (de->attr == ATTR_EXT)
293 if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
295 for (sum = 0, i = 0; i < 11; i++)
296 sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
297 if (sum != alias_checksum)
301 memcpy(work, de->name, sizeof(de->name));
302 /* see namei.c, msdos_format_name */
305 for (i = 0, j = 0, last_u = 0; i < 8;) {
307 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
308 &bufuname[j++], opt_shortname,
309 de->lcase & CASE_LOWER_BASE);
319 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
320 for (i = 0; i < 3;) {
321 if (!de->ext[i]) break;
322 chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
323 &bufuname[j++], opt_shortname,
324 de->lcase & CASE_LOWER_EXT);
326 if (de->ext[i] != ' ')
336 bufuname[last_u] = 0x0000;
338 ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
339 :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
340 if (xlate_len == name_len)
341 if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
342 (anycase && !nls_strnicmp(nls_io, name, bufname,
348 ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
349 :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
350 if (xlate_len != name_len)
352 if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
353 (anycase && !nls_strnicmp(nls_io, name, bufname,
360 nr_slots++; /* include the de */
361 sinfo->slot_off = cpos - nr_slots * sizeof(*de);
362 sinfo->nr_slots = nr_slots;
365 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
369 free_page((unsigned long)unicode);
374 EXPORT_SYMBOL(fat_search_long);
376 struct fat_ioctl_filldir_callback {
377 struct dirent __user *dirent;
380 const char *longname;
382 const char *shortname;
386 static int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
387 filldir_t filldir, int short_only, int both)
389 struct super_block *sb = inode->i_sb;
390 struct msdos_sb_info *sbi = MSDOS_SB(sb);
391 struct buffer_head *bh;
392 struct msdos_dir_entry *de;
393 struct nls_table *nls_io = sbi->nls_io;
394 struct nls_table *nls_disk = sbi->nls_disk;
395 unsigned char long_slots;
396 const char *fill_name;
398 wchar_t bufuname[14];
399 wchar_t *unicode = NULL;
400 unsigned char c, work[8], bufname[56], *ptname = bufname;
401 unsigned long lpos, dummy, *furrfu = &lpos;
402 int uni_xlate = sbi->options.unicode_xlate;
403 int isvfat = sbi->options.isvfat;
404 int utf8 = sbi->options.utf8;
405 int nocase = sbi->options.nocase;
406 unsigned short opt_shortname = sbi->options.shortname;
408 int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
415 /* Fake . and .. for the root directory. */
416 if (inode->i_ino == MSDOS_ROOT_INO) {
418 if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
429 if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
437 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
439 /* Check for long filename entry */
441 if (de->name[0] == DELETED_FLAG)
443 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
445 if (de->attr != ATTR_EXT && IS_FREE(de->name))
448 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
452 if (isvfat && de->attr == ATTR_EXT) {
453 struct msdos_dir_slot *ds;
458 unsigned char alias_checksum;
461 unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
471 ds = (struct msdos_dir_slot *) de;
476 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
479 alias_checksum = ds->alias_checksum;
487 fat16_towchar(unicode + offset, ds->name0_4, 5);
488 fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
489 fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
492 unicode[offset + 13] = 0;
494 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
498 ds = (struct msdos_dir_slot *) de;
499 if (ds->attr != ATTR_EXT)
500 goto RecEnd; /* XXX */
501 if ((ds->id & ~0x40) != slot)
503 if (ds->alias_checksum != alias_checksum)
506 if (de->name[0] == DELETED_FLAG)
508 if (de->attr == ATTR_EXT)
510 if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
512 for (sum = 0, i = 0; i < 11; i++)
513 sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
514 if (sum != alias_checksum)
518 if (sbi->options.dotsOK) {
521 if (de->attr & ATTR_HIDDEN) {
527 memcpy(work, de->name, sizeof(de->name));
528 /* see namei.c, msdos_format_name */
531 for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
532 if (!(c = work[i])) break;
533 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
534 &bufuname[j++], opt_shortname,
535 de->lcase & CASE_LOWER_BASE);
537 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
544 for (chi = 0; chi < chl && i < 8; chi++) {
552 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
554 for (i2 = 0; i2 < 3;) {
555 if (!(c = de->ext[i2])) break;
556 chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
557 &bufuname[j++], opt_shortname,
558 de->lcase & CASE_LOWER_EXT);
561 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
568 for (chi = 0; chi < chl && i2 < 3; chi++) {
569 ptname[i++] = de->ext[i2++];
577 i = last + dotoffset;
580 lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
581 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
583 else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
584 inum = parent_ino(filp->f_dentry);
586 loff_t i_pos = fat_make_i_pos(sb, bh, de);
587 struct inode *tmp = fat_iget(sb, i_pos);
592 inum = iunique(sb, MSDOS_ROOT_INO);
596 bufuname[j] = 0x0000;
597 i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
598 : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
603 if (!short_only && long_slots) {
604 /* convert the unicode long name. 261 is maximum size
605 * of unicode buffer. (13 * slots + nul) */
606 void *longname = unicode + 261;
607 int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
609 ? utf8_wcstombs(longname, unicode, buf_size)
610 : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
613 fill_name = longname;
616 /* hack for fat_ioctl_filldir() */
617 struct fat_ioctl_filldir_callback *p = dirent;
619 p->longname = longname;
620 p->long_len = long_len;
621 p->shortname = bufname;
627 if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
628 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
641 free_page((unsigned long)unicode);
647 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
649 struct inode *inode = filp->f_dentry->d_inode;
650 return fat_readdirx(inode, filp, dirent, filldir, 0, 0);
653 static int fat_ioctl_filldir(void *__buf, const char *name, int name_len,
654 loff_t offset, ino_t ino, unsigned int d_type)
656 struct fat_ioctl_filldir_callback *buf = __buf;
657 struct dirent __user *d1 = buf->dirent;
658 struct dirent __user *d2 = d1 + 1;
665 /* dirent has only short name */
666 if (name_len >= sizeof(d1->d_name))
667 name_len = sizeof(d1->d_name) - 1;
669 if (put_user(0, d2->d_name) ||
670 put_user(0, &d2->d_reclen) ||
671 copy_to_user(d1->d_name, name, name_len) ||
672 put_user(0, d1->d_name + name_len) ||
673 put_user(name_len, &d1->d_reclen))
676 /* dirent has short and long name */
677 const char *longname = buf->longname;
678 int long_len = buf->long_len;
679 const char *shortname = buf->shortname;
680 int short_len = buf->short_len;
682 if (long_len >= sizeof(d1->d_name))
683 long_len = sizeof(d1->d_name) - 1;
684 if (short_len >= sizeof(d1->d_name))
685 short_len = sizeof(d1->d_name) - 1;
687 if (copy_to_user(d2->d_name, longname, long_len) ||
688 put_user(0, d2->d_name + long_len) ||
689 put_user(long_len, &d2->d_reclen) ||
690 put_user(ino, &d2->d_ino) ||
691 put_user(offset, &d2->d_off) ||
692 copy_to_user(d1->d_name, shortname, short_len) ||
693 put_user(0, d1->d_name + short_len) ||
694 put_user(short_len, &d1->d_reclen))
699 buf->result = -EFAULT;
703 static int fat_dir_ioctl(struct inode * inode, struct file * filp,
704 unsigned int cmd, unsigned long arg)
706 struct fat_ioctl_filldir_callback buf;
707 struct dirent __user *d1;
708 int ret, short_only, both;
711 case VFAT_IOCTL_READDIR_SHORT:
715 case VFAT_IOCTL_READDIR_BOTH:
720 return fat_generic_ioctl(inode, filp, cmd, arg);
723 d1 = (struct dirent __user *)arg;
724 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
727 * Yes, we don't need this put_user() absolutely. However old
728 * code didn't return the right value. So, app use this value,
729 * in order to check whether it is EOF.
731 if (put_user(0, &d1->d_reclen))
738 if (!IS_DEADDIR(inode)) {
739 ret = fat_readdirx(inode, filp, &buf, fat_ioctl_filldir,
748 struct file_operations fat_dir_operations = {
749 .read = generic_read_dir,
750 .readdir = fat_readdir,
751 .ioctl = fat_dir_ioctl,
755 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
756 struct buffer_head **bh,
757 struct msdos_dir_entry **de)
759 while (fat_get_entry(dir, pos, bh, de) >= 0) {
760 /* free entry or long name entry or volume label */
761 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
768 * The ".." entry can not provide the "struct fat_slot_info" informations
769 * for inode. So, this function provide the some informations only.
771 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
772 struct msdos_dir_entry **de, loff_t *i_pos)
778 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
779 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
780 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
787 EXPORT_SYMBOL(fat_get_dotdot_entry);
789 /* See if directory is empty */
790 int fat_dir_empty(struct inode *dir)
792 struct buffer_head *bh;
793 struct msdos_dir_entry *de;
799 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
800 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) &&
801 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
810 EXPORT_SYMBOL(fat_dir_empty);
813 * fat_subdirs counts the number of sub-directories of dir. It can be run
814 * on directories being created.
816 int fat_subdirs(struct inode *dir)
818 struct buffer_head *bh;
819 struct msdos_dir_entry *de;
825 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
826 if (de->attr & ATTR_DIR)
834 * Scans a directory for a given file (name points to its formatted name).
835 * Returns an error code or zero.
837 int fat_scan(struct inode *dir, const unsigned char *name,
838 struct fat_slot_info *sinfo)
840 struct super_block *sb = dir->i_sb;
844 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
846 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
847 sinfo->slot_off -= sizeof(*sinfo->de);
849 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
856 EXPORT_SYMBOL(fat_scan);
858 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
860 struct super_block *sb = dir->i_sb;
861 struct buffer_head *bh;
862 struct msdos_dir_entry *de, *endp;
863 int err = 0, orig_slots;
867 if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
872 orig_slots = nr_slots;
873 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
874 while (nr_slots && de < endp) {
875 de->name[0] = DELETED_FLAG;
879 mark_buffer_dirty(bh);
881 err = sync_dirty_buffer(bh);
886 /* pos is *next* de's position, so this does `- sizeof(de)' */
887 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
893 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
895 struct msdos_dir_entry *de;
896 struct buffer_head *bh;
897 int err = 0, nr_slots;
900 * First stage: Remove the shortname. By this, the directory
903 nr_slots = sinfo->nr_slots;
908 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
909 de->name[0] = DELETED_FLAG;
913 mark_buffer_dirty(bh);
915 err = sync_dirty_buffer(bh);
923 * Second stage: remove the remaining longname slots.
924 * (This directory entry is already removed, and so return
927 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
930 "FAT: Couldn't remove the long name slots\n");
934 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
936 (void)fat_sync_inode(dir);
938 mark_inode_dirty(dir);
943 EXPORT_SYMBOL(fat_remove_entries);
945 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
946 struct buffer_head **bhs, int nr_bhs)
948 struct super_block *sb = dir->i_sb;
949 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
952 /* Zeroing the unused blocks on this cluster */
955 while (blknr < last_blknr) {
956 bhs[n] = sb_getblk(sb, blknr);
961 memset(bhs[n]->b_data, 0, sb->s_blocksize);
962 set_buffer_uptodate(bhs[n]);
963 mark_buffer_dirty(bhs[n]);
968 if (IS_DIRSYNC(dir)) {
969 err = fat_sync_bhs(bhs, n);
973 for (i = 0; i < n; i++)
978 if (IS_DIRSYNC(dir)) {
979 err = fat_sync_bhs(bhs, n);
983 for (i = 0; i < n; i++)
989 for (i = 0; i < n; i++)
994 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
996 struct super_block *sb = dir->i_sb;
997 struct msdos_sb_info *sbi = MSDOS_SB(sb);
998 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
999 struct msdos_dir_entry *de;
1004 err = fat_alloc_clusters(dir, &cluster, 1);
1008 blknr = fat_clus_to_blknr(sbi, cluster);
1009 bhs[0] = sb_getblk(sb, blknr);
1015 fat_date_unix2dos(ts->tv_sec, &time, &date);
1017 de = (struct msdos_dir_entry *)bhs[0]->b_data;
1018 /* filling the new directory slots ("." and ".." entries) */
1019 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
1020 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
1021 de->attr = de[1].attr = ATTR_DIR;
1022 de[0].lcase = de[1].lcase = 0;
1023 de[0].time = de[1].time = time;
1024 de[0].date = de[1].date = date;
1025 de[0].ctime_cs = de[1].ctime_cs = 0;
1026 if (sbi->options.isvfat) {
1027 /* extra timestamps */
1028 de[0].ctime = de[1].ctime = time;
1029 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
1031 de[0].ctime = de[1].ctime = 0;
1032 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
1034 de[0].start = cpu_to_le16(cluster);
1035 de[0].starthi = cpu_to_le16(cluster >> 16);
1036 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
1037 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
1038 de[0].size = de[1].size = 0;
1039 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
1040 set_buffer_uptodate(bhs[0]);
1041 mark_buffer_dirty(bhs[0]);
1043 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
1050 fat_free_clusters(dir, cluster);
1055 EXPORT_SYMBOL(fat_alloc_new_dir);
1057 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
1058 int *nr_cluster, struct msdos_dir_entry **de,
1059 struct buffer_head **bh, loff_t *i_pos)
1061 struct super_block *sb = dir->i_sb;
1062 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1063 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1064 sector_t blknr, start_blknr, last_blknr;
1065 unsigned long size, copy;
1066 int err, i, n, offset, cluster[2];
1069 * The minimum cluster size is 512bytes, and maximum entry
1070 * size is 32*slots (672bytes). So, iff the cluster size is
1071 * 512bytes, we may need two clusters.
1073 size = nr_slots * sizeof(struct msdos_dir_entry);
1074 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
1075 BUG_ON(*nr_cluster > 2);
1077 err = fat_alloc_clusters(dir, cluster, *nr_cluster);
1082 * First stage: Fill the directory entry. NOTE: This cluster
1083 * is not referenced from any inode yet, so updates order is
1088 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
1089 last_blknr = start_blknr + sbi->sec_per_clus;
1090 while (blknr < last_blknr) {
1091 bhs[n] = sb_getblk(sb, blknr);
1097 /* fill the directory entry */
1098 copy = min(size, sb->s_blocksize);
1099 memcpy(bhs[n]->b_data, slots, copy);
1102 set_buffer_uptodate(bhs[n]);
1103 mark_buffer_dirty(bhs[n]);
1109 } while (++i < *nr_cluster);
1111 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
1112 offset = copy - sizeof(struct msdos_dir_entry);
1115 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
1116 *i_pos = fat_make_i_pos(sb, *bh, *de);
1118 /* Second stage: clear the rest of cluster, and write outs */
1119 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
1130 for (i = 0; i < n; i++)
1132 fat_free_clusters(dir, cluster[0]);
1137 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
1138 struct fat_slot_info *sinfo)
1140 struct super_block *sb = dir->i_sb;
1141 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1142 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
1143 struct msdos_dir_entry *de;
1144 int err, free_slots, i, nr_bhs;
1147 sinfo->nr_slots = nr_slots;
1149 /* First stage: search free direcotry entries */
1150 free_slots = nr_bhs = 0;
1154 while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
1155 /* check the maximum size of directory */
1156 if (pos >= FAT_MAX_DIR_SIZE)
1159 if (IS_FREE(de->name)) {
1162 bhs[nr_bhs] = prev = bh;
1166 if (free_slots == nr_slots)
1169 for (i = 0; i < nr_bhs; i++)
1172 free_slots = nr_bhs = 0;
1175 if (dir->i_ino == MSDOS_ROOT_INO) {
1176 if (sbi->fat_bits != 32)
1178 } else if (MSDOS_I(dir)->i_start == 0) {
1179 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
1180 MSDOS_I(dir)->i_pos);
1187 pos -= free_slots * sizeof(*de);
1188 nr_slots -= free_slots;
1191 * Second stage: filling the free entries with new entries.
1192 * NOTE: If this slots has shortname, first, we write
1193 * the long name slots, then write the short name.
1195 int size = free_slots * sizeof(*de);
1196 int offset = pos & (sb->s_blocksize - 1);
1197 int long_bhs = nr_bhs - (nr_slots == 0);
1199 /* Fill the long name slots. */
1200 for (i = 0; i < long_bhs; i++) {
1201 int copy = min_t(int, sb->s_blocksize - offset, size);
1202 memcpy(bhs[i]->b_data + offset, slots, copy);
1203 mark_buffer_dirty(bhs[i]);
1208 if (long_bhs && IS_DIRSYNC(dir))
1209 err = fat_sync_bhs(bhs, long_bhs);
1210 if (!err && i < nr_bhs) {
1211 /* Fill the short name slot. */
1212 int copy = min_t(int, sb->s_blocksize - offset, size);
1213 memcpy(bhs[i]->b_data + offset, slots, copy);
1214 mark_buffer_dirty(bhs[i]);
1215 if (IS_DIRSYNC(dir))
1216 err = sync_dirty_buffer(bhs[i]);
1218 for (i = 0; i < nr_bhs; i++)
1225 int cluster, nr_cluster;
1228 * Third stage: allocate the cluster for new entries.
1229 * And initialize the cluster with new entries, then
1230 * add the cluster to dir.
1232 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
1238 err = fat_chain_add(dir, cluster, nr_cluster);
1240 fat_free_clusters(dir, cluster);
1243 if (dir->i_size & (sbi->cluster_size - 1)) {
1244 fat_fs_panic(sb, "Odd directory size");
1245 dir->i_size = (dir->i_size + sbi->cluster_size - 1)
1246 & ~((loff_t)sbi->cluster_size - 1);
1248 dir->i_size += nr_cluster << sbi->cluster_bits;
1249 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
1251 sinfo->slot_off = pos;
1254 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
1260 for (i = 0; i < nr_bhs; i++)
1267 __fat_remove_entries(dir, pos, free_slots);
1271 EXPORT_SYMBOL(fat_add_entries);