newdir.c revision 6a26b38ac46a0489bd477832dcaebd276c2f489b 
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 Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12#include "config.h"
13#include <stdio.h>
14#include <string.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18
19#include "ext2_fs.h"
20#include "ext2fs.h"
21
22#ifndef EXT2_FT_DIR
23#define EXT2_FT_DIR		2
24#endif
25
26/*
27 * Create new directory block
28 */
29errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
30			       ext2_ino_t parent_ino, char **block)
31{
32	struct ext2_dir_entry 	*dir = NULL;
33	errcode_t		retval;
34	char			*buf;
35	int			rec_len;
36	int			filetype = 0;
37
38	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
39
40	retval = ext2fs_get_mem(fs->blocksize, &buf);
41	if (retval)
42		return retval;
43	memset(buf, 0, fs->blocksize);
44	dir = (struct ext2_dir_entry *) buf;
45
46	retval = ext2fs_set_rec_len(fs, fs->blocksize, dir);
47	if (retval) {
48		ext2fs_free_mem(&buf);
49		return retval;
50	}
51
52	if (dir_ino) {
53		if (fs->super->s_feature_incompat &
54		    EXT2_FEATURE_INCOMPAT_FILETYPE)
55			filetype = EXT2_FT_DIR << 8;
56		/*
57		 * Set up entry for '.'
58		 */
59		dir->inode = dir_ino;
60		dir->name_len = 1 | filetype;
61		dir->name[0] = '.';
62		rec_len = fs->blocksize - EXT2_DIR_REC_LEN(1);
63		dir->rec_len = EXT2_DIR_REC_LEN(1);
64
65		/*
66		 * Set up entry for '..'
67		 */
68		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
69		retval = ext2fs_set_rec_len(fs, rec_len, dir);
70		if (retval) {
71			ext2fs_free_mem(&buf);
72			return retval;
73		}
74		dir->inode = parent_ino;
75		dir->name_len = 2 | filetype;
76		dir->name[0] = '.';
77		dir->name[1] = '.';
78
79	}
80	*block = buf;
81	return 0;
82}
83