newdir.c revision 8a480350952f6f0fdbce54326b6d847e66368897 
1/*
2 * newdir.c --- create a new directory block
3 *
4 * Copyright (C) 1994, 1995 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17
18#include "ext2_fs.h"
19#include "ext2fs.h"
20
21#ifndef EXT2_FT_DIR
22#define EXT2_FT_DIR		2
23#endif
24
25/*
26 * Create new directory block
27 */
28errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
29			       ext2_ino_t parent_ino, char **block)
30{
31	struct ext2_dir_entry 	*dir = NULL;
32	errcode_t		retval;
33	char			*buf;
34	int			rec_len;
35	int			filetype = 0;
36
37	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
38
39	retval = ext2fs_get_mem(fs->blocksize, &buf);
40	if (retval)
41		return retval;
42	memset(buf, 0, fs->blocksize);
43	dir = (struct ext2_dir_entry *) buf;
44
45	retval = ext2fs_set_rec_len(fs, fs->blocksize, dir);
46	if (retval)
47		return retval;
48
49	if (dir_ino) {
50		if (fs->super->s_feature_incompat &
51		    EXT2_FEATURE_INCOMPAT_FILETYPE)
52			filetype = EXT2_FT_DIR << 8;
53		/*
54		 * Set up entry for '.'
55		 */
56		dir->inode = dir_ino;
57		dir->name_len = 1 | filetype;
58		dir->name[0] = '.';
59		rec_len = fs->blocksize - EXT2_DIR_REC_LEN(1);
60		dir->rec_len = EXT2_DIR_REC_LEN(1);
61
62		/*
63		 * Set up entry for '..'
64		 */
65		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
66		retval = ext2fs_set_rec_len(fs, rec_len, dir);
67		if (retval)
68			return retval;
69		dir->inode = parent_ino;
70		dir->name_len = 2 | filetype;
71		dir->name[0] = '.';
72		dir->name[1] = '.';
73
74	}
75	*block = buf;
76	return 0;
77}
78