newdir.c revision 9f8046fc6dfc13eee2f5c363214e60b533872cac 
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, (void **) &buf);
40	if (retval)
41		return retval;
42	memset(buf, 0, fs->blocksize);
43	dir = (struct ext2_dir_entry *) buf;
44	dir->rec_len = fs->blocksize;
45
46	if (dir_ino) {
47		if (fs->super->s_feature_incompat &
48		    EXT2_FEATURE_INCOMPAT_FILETYPE)
49			filetype = EXT2_FT_DIR << 8;
50		/*
51		 * Set up entry for '.'
52		 */
53		dir->inode = dir_ino;
54		dir->name_len = 1 | filetype;
55		dir->name[0] = '.';
56		rec_len = dir->rec_len - EXT2_DIR_REC_LEN(1);
57		dir->rec_len = EXT2_DIR_REC_LEN(1);
58
59		/*
60		 * Set up entry for '..'
61		 */
62		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
63		dir->rec_len = rec_len;
64		dir->inode = parent_ino;
65		dir->name_len = 2 | filetype;
66		dir->name[0] = '.';
67		dir->name[1] = '.';
68
69	}
70	*block = buf;
71	return 0;
72}
73