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 <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 static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
36 struct super_block *sb = dir->i_sb;
37 struct msdos_sb_info *sbi = MSDOS_SB(sb);
38 struct buffer_head *bh;
41 /* This is not a first sector of cluster, or sec_per_clus == 1 */
42 if ((iblock & (sbi->sec_per_clus - 1)) || sbi->sec_per_clus == 1)
44 /* root dir of FAT12/FAT16 */
45 if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
48 bh = sb_getblk(sb, phys);
49 if (bh && !buffer_uptodate(bh)) {
50 for (sec = 0; sec < sbi->sec_per_clus; sec++)
51 sb_breadahead(sb, phys + sec);
56 /* Returns the inode number of the directory entry at offset pos. If bh is
57 non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
59 AV. Most often we do it item-by-item. Makes sense to optimize.
60 AV. OK, there we go: if both bh and de are non-NULL we assume that we just
61 AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
62 AV. It's done in fat_get_entry() (inlined), here the slow case lives.
63 AV. Additionally, when we return -1 (i.e. reached the end of directory)
66 static int fat__get_entry(struct inode *dir, loff_t *pos,
67 struct buffer_head **bh, struct msdos_dir_entry **de)
69 struct super_block *sb = dir->i_sb;
70 sector_t phys, iblock;
79 iblock = *pos >> sb->s_blocksize_bits;
80 err = fat_bmap(dir, iblock, &phys);
82 return -1; /* beyond EOF or error */
84 fat_dir_readahead(dir, iblock, phys);
86 *bh = sb_bread(sb, phys);
88 printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
89 (unsigned long long)phys);
91 *pos = (iblock + 1) << sb->s_blocksize_bits;
95 offset = *pos & (sb->s_blocksize - 1);
96 *pos += sizeof(struct msdos_dir_entry);
97 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
102 static inline int fat_get_entry(struct inode *dir, loff_t *pos,
103 struct buffer_head **bh,
104 struct msdos_dir_entry **de)
106 /* Fast stuff first */
108 (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
109 *pos += sizeof(struct msdos_dir_entry);
113 return fat__get_entry(dir, pos, bh, de);
117 * Convert Unicode 16 to UTF8, translated Unicode, or ASCII.
118 * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
119 * colon as an escape character since it is normally invalid on the vfat
120 * filesystem. The following four characters are the hexadecimal digits
121 * of Unicode value. This lets us do a full dump and restore of Unicode
122 * filenames. We could get into some trouble with long Unicode names,
123 * but ignore that right now.
124 * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
126 static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
127 struct nls_table *nls)
130 unsigned char *op, nc;
139 if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
142 if (uni_xlate == 1) {
144 for (k = 4; k > 0; k--) {
146 op[k] = nc > 9 ? nc + ('a' - 10)
155 /* We have some slack there, so it's OK */
166 fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
170 charlen = t->char2uni(c, clen, uni);
172 *uni = 0x003f; /* a question mark */
179 fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
184 charlen = t->char2uni(c, clen, &wc);
186 *uni = 0x003f; /* a question mark */
188 } else if (charlen <= 1) {
189 unsigned char nc = t->charset2lower[*c];
194 if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
195 *uni = 0x003f; /* a question mark */
205 fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
206 wchar_t *uni_buf, unsigned short opt, int lower)
210 if (opt & VFAT_SFN_DISPLAY_LOWER)
211 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
212 else if (opt & VFAT_SFN_DISPLAY_WIN95)
213 len = fat_short2uni(nls, buf, buf_size, uni_buf);
214 else if (opt & VFAT_SFN_DISPLAY_WINNT) {
216 len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
218 len = fat_short2uni(nls, buf, buf_size, uni_buf);
220 len = fat_short2uni(nls, buf, buf_size, uni_buf);
226 * Return values: negative -> error, 0 -> not found, positive -> found,
227 * value is the total amount of slots, including the shortname entry.
229 int fat_search_long(struct inode *inode, const unsigned char *name,
230 int name_len, struct fat_slot_info *sinfo)
232 struct super_block *sb = inode->i_sb;
233 struct msdos_sb_info *sbi = MSDOS_SB(sb);
234 struct buffer_head *bh = NULL;
235 struct msdos_dir_entry *de;
236 struct nls_table *nls_io = sbi->nls_io;
237 struct nls_table *nls_disk = sbi->nls_disk;
238 wchar_t bufuname[14];
239 unsigned char xlate_len, nr_slots;
240 wchar_t *unicode = NULL;
241 unsigned char work[8], bufname[260]; /* 256 + 4 */
242 int uni_xlate = sbi->options.unicode_xlate;
243 int utf8 = sbi->options.utf8;
244 int anycase = (sbi->options.name_check != 's');
245 unsigned short opt_shortname = sbi->options.shortname;
247 int chl, i, j, last_u, err;
251 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
255 if (de->name[0] == DELETED_FLAG)
257 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
259 if (de->attr != ATTR_EXT && IS_FREE(de->name))
261 if (de->attr == ATTR_EXT) {
262 struct msdos_dir_slot *ds;
267 unsigned char alias_checksum;
270 unicode = (wchar_t *)
271 __get_free_page(GFP_KERNEL);
279 ds = (struct msdos_dir_slot *) de;
284 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
287 alias_checksum = ds->alias_checksum;
295 fat16_towchar(unicode + offset, ds->name0_4, 5);
296 fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
297 fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
300 unicode[offset + 13] = 0;
302 if (fat_get_entry(inode, &cpos, &bh, &de) < 0)
306 ds = (struct msdos_dir_slot *) de;
307 if (ds->attr != ATTR_EXT)
309 if ((ds->id & ~0x40) != slot)
311 if (ds->alias_checksum != alias_checksum)
314 if (de->name[0] == DELETED_FLAG)
316 if (de->attr == ATTR_EXT)
318 if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
320 for (sum = 0, i = 0; i < 11; i++)
321 sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
322 if (sum != alias_checksum)
326 memcpy(work, de->name, sizeof(de->name));
327 /* see namei.c, msdos_format_name */
330 for (i = 0, j = 0, last_u = 0; i < 8;) {
332 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
333 &bufuname[j++], opt_shortname,
334 de->lcase & CASE_LOWER_BASE);
344 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
345 for (i = 0; i < 3;) {
346 if (!de->ext[i]) break;
347 chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
348 &bufuname[j++], opt_shortname,
349 de->lcase & CASE_LOWER_EXT);
351 if (de->ext[i] != ' ')
361 bufuname[last_u] = 0x0000;
363 ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
364 :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
365 if (xlate_len == name_len)
366 if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
367 (anycase && !nls_strnicmp(nls_io, name, bufname,
373 ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
374 :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
375 if (xlate_len != name_len)
377 if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
378 (anycase && !nls_strnicmp(nls_io, name, bufname,
385 nr_slots++; /* include the de */
386 sinfo->slot_off = cpos - nr_slots * sizeof(*de);
387 sinfo->nr_slots = nr_slots;
390 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
394 free_page((unsigned long)unicode);
399 EXPORT_SYMBOL(fat_search_long);
401 struct fat_ioctl_filldir_callback {
402 struct dirent __user *dirent;
405 const char *longname;
407 const char *shortname;
411 static int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
412 filldir_t filldir, int short_only, int both)
414 struct super_block *sb = inode->i_sb;
415 struct msdos_sb_info *sbi = MSDOS_SB(sb);
416 struct buffer_head *bh;
417 struct msdos_dir_entry *de;
418 struct nls_table *nls_io = sbi->nls_io;
419 struct nls_table *nls_disk = sbi->nls_disk;
420 unsigned char long_slots;
421 const char *fill_name;
423 wchar_t bufuname[14];
424 wchar_t *unicode = NULL;
425 unsigned char c, work[8], bufname[56], *ptname = bufname;
426 unsigned long lpos, dummy, *furrfu = &lpos;
427 int uni_xlate = sbi->options.unicode_xlate;
428 int isvfat = sbi->options.isvfat;
429 int utf8 = sbi->options.utf8;
430 int nocase = sbi->options.nocase;
431 unsigned short opt_shortname = sbi->options.shortname;
433 int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
440 /* Fake . and .. for the root directory. */
441 if (inode->i_ino == MSDOS_ROOT_INO) {
443 if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
454 if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
462 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
464 /* Check for long filename entry */
466 if (de->name[0] == DELETED_FLAG)
468 if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
470 if (de->attr != ATTR_EXT && IS_FREE(de->name))
473 if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
477 if (isvfat && de->attr == ATTR_EXT) {
478 struct msdos_dir_slot *ds;
483 unsigned char alias_checksum;
486 unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
496 ds = (struct msdos_dir_slot *) de;
501 if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
504 alias_checksum = ds->alias_checksum;
512 fat16_towchar(unicode + offset, ds->name0_4, 5);
513 fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
514 fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
517 unicode[offset + 13] = 0;
519 if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
523 ds = (struct msdos_dir_slot *) de;
524 if (ds->attr != ATTR_EXT)
525 goto RecEnd; /* XXX */
526 if ((ds->id & ~0x40) != slot)
528 if (ds->alias_checksum != alias_checksum)
531 if (de->name[0] == DELETED_FLAG)
533 if (de->attr == ATTR_EXT)
535 if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
537 for (sum = 0, i = 0; i < 11; i++)
538 sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
539 if (sum != alias_checksum)
543 if (sbi->options.dotsOK) {
546 if (de->attr & ATTR_HIDDEN) {
552 memcpy(work, de->name, sizeof(de->name));
553 /* see namei.c, msdos_format_name */
556 for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
557 if (!(c = work[i])) break;
558 chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
559 &bufuname[j++], opt_shortname,
560 de->lcase & CASE_LOWER_BASE);
562 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
569 for (chi = 0; chi < chl && i < 8; chi++) {
577 fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
579 for (i2 = 0; i2 < 3;) {
580 if (!(c = de->ext[i2])) break;
581 chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
582 &bufuname[j++], opt_shortname,
583 de->lcase & CASE_LOWER_EXT);
586 ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
593 for (chi = 0; chi < chl && i2 < 3; chi++) {
594 ptname[i++] = de->ext[i2++];
602 i = last + dotoffset;
605 lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
606 if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
608 else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
609 inum = parent_ino(filp->f_dentry);
611 loff_t i_pos = fat_make_i_pos(sb, bh, de);
612 struct inode *tmp = fat_iget(sb, i_pos);
617 inum = iunique(sb, MSDOS_ROOT_INO);
621 bufuname[j] = 0x0000;
622 i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
623 : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
628 if (!short_only && long_slots) {
629 /* convert the unicode long name. 261 is maximum size
630 * of unicode buffer. (13 * slots + nul) */
631 void *longname = unicode + 261;
632 int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
634 ? utf8_wcstombs(longname, unicode, buf_size)
635 : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
638 fill_name = longname;
641 /* hack for fat_ioctl_filldir() */
642 struct fat_ioctl_filldir_callback *p = dirent;
644 p->longname = longname;
645 p->long_len = long_len;
646 p->shortname = bufname;
652 if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
653 (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
665 free_page((unsigned long)unicode);
671 static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
673 struct inode *inode = filp->f_dentry->d_inode;
674 return fat_readdirx(inode, filp, dirent, filldir, 0, 0);
677 static int fat_ioctl_filldir(void *__buf, const char *name, int name_len,
678 loff_t offset, ino_t ino, unsigned int d_type)
680 struct fat_ioctl_filldir_callback *buf = __buf;
681 struct dirent __user *d1 = buf->dirent;
682 struct dirent __user *d2 = d1 + 1;
689 /* dirent has only short name */
690 if (name_len >= sizeof(d1->d_name))
691 name_len = sizeof(d1->d_name) - 1;
693 if (put_user(0, d2->d_name) ||
694 put_user(0, &d2->d_reclen) ||
695 copy_to_user(d1->d_name, name, name_len) ||
696 put_user(0, d1->d_name + name_len) ||
697 put_user(name_len, &d1->d_reclen))
700 /* dirent has short and long name */
701 const char *longname = buf->longname;
702 int long_len = buf->long_len;
703 const char *shortname = buf->shortname;
704 int short_len = buf->short_len;
706 if (long_len >= sizeof(d1->d_name))
707 long_len = sizeof(d1->d_name) - 1;
708 if (short_len >= sizeof(d1->d_name))
709 short_len = sizeof(d1->d_name) - 1;
711 if (copy_to_user(d2->d_name, longname, long_len) ||
712 put_user(0, d2->d_name + long_len) ||
713 put_user(long_len, &d2->d_reclen) ||
714 put_user(ino, &d2->d_ino) ||
715 put_user(offset, &d2->d_off) ||
716 copy_to_user(d1->d_name, shortname, short_len) ||
717 put_user(0, d1->d_name + short_len) ||
718 put_user(short_len, &d1->d_reclen))
723 buf->result = -EFAULT;
727 static int fat_dir_ioctl(struct inode * inode, struct file * filp,
728 unsigned int cmd, unsigned long arg)
730 struct fat_ioctl_filldir_callback buf;
731 struct dirent __user *d1;
732 int ret, short_only, both;
735 case VFAT_IOCTL_READDIR_SHORT:
739 case VFAT_IOCTL_READDIR_BOTH:
744 return fat_generic_ioctl(inode, filp, cmd, arg);
747 d1 = (struct dirent __user *)arg;
748 if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
751 * Yes, we don't need this put_user() absolutely. However old
752 * code didn't return the right value. So, app use this value,
753 * in order to check whether it is EOF.
755 if (put_user(0, &d1->d_reclen))
762 if (!IS_DEADDIR(inode)) {
763 ret = fat_readdirx(inode, filp, &buf, fat_ioctl_filldir,
772 struct file_operations fat_dir_operations = {
773 .read = generic_read_dir,
774 .readdir = fat_readdir,
775 .ioctl = fat_dir_ioctl,
779 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
780 struct buffer_head **bh,
781 struct msdos_dir_entry **de)
783 while (fat_get_entry(dir, pos, bh, de) >= 0) {
784 /* free entry or long name entry or volume label */
785 if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
792 * The ".." entry can not provide the "struct fat_slot_info" informations
793 * for inode. So, this function provide the some informations only.
795 int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
796 struct msdos_dir_entry **de, loff_t *i_pos)
802 while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
803 if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
804 *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
811 EXPORT_SYMBOL(fat_get_dotdot_entry);
813 /* See if directory is empty */
814 int fat_dir_empty(struct inode *dir)
816 struct buffer_head *bh;
817 struct msdos_dir_entry *de;
823 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
824 if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) &&
825 strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
834 EXPORT_SYMBOL(fat_dir_empty);
837 * fat_subdirs counts the number of sub-directories of dir. It can be run
838 * on directories being created.
840 int fat_subdirs(struct inode *dir)
842 struct buffer_head *bh;
843 struct msdos_dir_entry *de;
849 while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
850 if (de->attr & ATTR_DIR)
858 * Scans a directory for a given file (name points to its formatted name).
859 * Returns an error code or zero.
861 int fat_scan(struct inode *dir, const unsigned char *name,
862 struct fat_slot_info *sinfo)
864 struct super_block *sb = dir->i_sb;
868 while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
870 if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
871 sinfo->slot_off -= sizeof(*sinfo->de);
873 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
880 EXPORT_SYMBOL(fat_scan);
882 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
884 struct super_block *sb = dir->i_sb;
885 struct buffer_head *bh;
886 struct msdos_dir_entry *de, *endp;
887 int err = 0, orig_slots;
891 if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
896 orig_slots = nr_slots;
897 endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
898 while (nr_slots && de < endp) {
899 de->name[0] = DELETED_FLAG;
903 mark_buffer_dirty(bh);
905 err = sync_dirty_buffer(bh);
910 /* pos is *next* de's position, so this does `- sizeof(de)' */
911 pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
917 int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
919 struct msdos_dir_entry *de;
920 struct buffer_head *bh;
921 int err = 0, nr_slots;
924 * First stage: Remove the shortname. By this, the directory
927 nr_slots = sinfo->nr_slots;
932 while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
933 de->name[0] = DELETED_FLAG;
937 mark_buffer_dirty(bh);
939 err = sync_dirty_buffer(bh);
947 * Second stage: remove the remaining longname slots.
948 * (This directory entry is already removed, and so return
951 err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
954 "FAT: Couldn't remove the long name slots\n");
958 dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
960 (void)fat_sync_inode(dir);
962 mark_inode_dirty(dir);
967 EXPORT_SYMBOL(fat_remove_entries);
969 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
970 struct buffer_head **bhs, int nr_bhs)
972 struct super_block *sb = dir->i_sb;
973 sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
976 /* Zeroing the unused blocks on this cluster */
979 while (blknr < last_blknr) {
980 bhs[n] = sb_getblk(sb, blknr);
985 memset(bhs[n]->b_data, 0, sb->s_blocksize);
986 set_buffer_uptodate(bhs[n]);
987 mark_buffer_dirty(bhs[n]);
992 if (IS_DIRSYNC(dir)) {
993 err = fat_sync_bhs(bhs, n);
997 for (i = 0; i < n; i++)
1002 if (IS_DIRSYNC(dir)) {
1003 err = fat_sync_bhs(bhs, n);
1007 for (i = 0; i < n; i++)
1013 for (i = 0; i < n; i++)
1018 int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
1020 struct super_block *sb = dir->i_sb;
1021 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1022 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1023 struct msdos_dir_entry *de;
1028 err = fat_alloc_clusters(dir, &cluster, 1);
1032 blknr = fat_clus_to_blknr(sbi, cluster);
1033 bhs[0] = sb_getblk(sb, blknr);
1039 fat_date_unix2dos(ts->tv_sec, &time, &date);
1041 de = (struct msdos_dir_entry *)bhs[0]->b_data;
1042 /* filling the new directory slots ("." and ".." entries) */
1043 memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
1044 memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
1045 de->attr = de[1].attr = ATTR_DIR;
1046 de[0].lcase = de[1].lcase = 0;
1047 de[0].time = de[1].time = time;
1048 de[0].date = de[1].date = date;
1049 de[0].ctime_cs = de[1].ctime_cs = 0;
1050 if (sbi->options.isvfat) {
1051 /* extra timestamps */
1052 de[0].ctime = de[1].ctime = time;
1053 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
1055 de[0].ctime = de[1].ctime = 0;
1056 de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
1058 de[0].start = cpu_to_le16(cluster);
1059 de[0].starthi = cpu_to_le16(cluster >> 16);
1060 de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
1061 de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
1062 de[0].size = de[1].size = 0;
1063 memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
1064 set_buffer_uptodate(bhs[0]);
1065 mark_buffer_dirty(bhs[0]);
1067 err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
1074 fat_free_clusters(dir, cluster);
1079 EXPORT_SYMBOL(fat_alloc_new_dir);
1081 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
1082 int *nr_cluster, struct msdos_dir_entry **de,
1083 struct buffer_head **bh, loff_t *i_pos)
1085 struct super_block *sb = dir->i_sb;
1086 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1087 struct buffer_head *bhs[MAX_BUF_PER_PAGE];
1088 sector_t blknr, start_blknr, last_blknr;
1089 unsigned long size, copy;
1090 int err, i, n, offset, cluster[2];
1093 * The minimum cluster size is 512bytes, and maximum entry
1094 * size is 32*slots (672bytes). So, iff the cluster size is
1095 * 512bytes, we may need two clusters.
1097 size = nr_slots * sizeof(struct msdos_dir_entry);
1098 *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
1099 BUG_ON(*nr_cluster > 2);
1101 err = fat_alloc_clusters(dir, cluster, *nr_cluster);
1106 * First stage: Fill the directory entry. NOTE: This cluster
1107 * is not referenced from any inode yet, so updates order is
1112 start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
1113 last_blknr = start_blknr + sbi->sec_per_clus;
1114 while (blknr < last_blknr) {
1115 bhs[n] = sb_getblk(sb, blknr);
1121 /* fill the directory entry */
1122 copy = min(size, sb->s_blocksize);
1123 memcpy(bhs[n]->b_data, slots, copy);
1126 set_buffer_uptodate(bhs[n]);
1127 mark_buffer_dirty(bhs[n]);
1133 } while (++i < *nr_cluster);
1135 memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
1136 offset = copy - sizeof(struct msdos_dir_entry);
1139 *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
1140 *i_pos = fat_make_i_pos(sb, *bh, *de);
1142 /* Second stage: clear the rest of cluster, and write outs */
1143 err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
1154 for (i = 0; i < n; i++)
1156 fat_free_clusters(dir, cluster[0]);
1161 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
1162 struct fat_slot_info *sinfo)
1164 struct super_block *sb = dir->i_sb;
1165 struct msdos_sb_info *sbi = MSDOS_SB(sb);
1166 struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
1167 struct msdos_dir_entry *de;
1168 int err, free_slots, i, nr_bhs;
1171 sinfo->nr_slots = nr_slots;
1173 /* First stage: search free direcotry entries */
1174 free_slots = nr_bhs = 0;
1178 while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
1179 /* check the maximum size of directory */
1180 if (pos >= FAT_MAX_DIR_SIZE)
1183 if (IS_FREE(de->name)) {
1186 bhs[nr_bhs] = prev = bh;
1190 if (free_slots == nr_slots)
1193 for (i = 0; i < nr_bhs; i++)
1196 free_slots = nr_bhs = 0;
1199 if (dir->i_ino == MSDOS_ROOT_INO) {
1200 if (sbi->fat_bits != 32)
1202 } else if (MSDOS_I(dir)->i_start == 0) {
1203 printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
1204 MSDOS_I(dir)->i_pos);
1211 pos -= free_slots * sizeof(*de);
1212 nr_slots -= free_slots;
1215 * Second stage: filling the free entries with new entries.
1216 * NOTE: If this slots has shortname, first, we write
1217 * the long name slots, then write the short name.
1219 int size = free_slots * sizeof(*de);
1220 int offset = pos & (sb->s_blocksize - 1);
1221 int long_bhs = nr_bhs - (nr_slots == 0);
1223 /* Fill the long name slots. */
1224 for (i = 0; i < long_bhs; i++) {
1225 int copy = min_t(int, sb->s_blocksize - offset, size);
1226 memcpy(bhs[i]->b_data + offset, slots, copy);
1227 mark_buffer_dirty(bhs[i]);
1232 if (long_bhs && IS_DIRSYNC(dir))
1233 err = fat_sync_bhs(bhs, long_bhs);
1234 if (!err && i < nr_bhs) {
1235 /* Fill the short name slot. */
1236 int copy = min_t(int, sb->s_blocksize - offset, size);
1237 memcpy(bhs[i]->b_data + offset, slots, copy);
1238 mark_buffer_dirty(bhs[i]);
1239 if (IS_DIRSYNC(dir))
1240 err = sync_dirty_buffer(bhs[i]);
1242 for (i = 0; i < nr_bhs; i++)
1249 int cluster, nr_cluster;
1252 * Third stage: allocate the cluster for new entries.
1253 * And initialize the cluster with new entries, then
1254 * add the cluster to dir.
1256 cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
1262 err = fat_chain_add(dir, cluster, nr_cluster);
1264 fat_free_clusters(dir, cluster);
1267 if (dir->i_size & (sbi->cluster_size - 1)) {
1268 fat_fs_panic(sb, "Odd directory size");
1269 dir->i_size = (dir->i_size + sbi->cluster_size - 1)
1270 & ~((loff_t)sbi->cluster_size - 1);
1272 dir->i_size += nr_cluster << sbi->cluster_bits;
1273 MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
1275 sinfo->slot_off = pos;
1278 sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
1284 for (i = 0; i < nr_bhs; i++)
1291 __fat_remove_entries(dir, pos, free_slots);
1295 EXPORT_SYMBOL(fat_add_entries);