newdir.c revision e5b38a5fafe4807b54d90a2e70bddf4b41b1695b 
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#if EXT2_FLAT_INCLUDES
19#include "ext2_fs.h"
20#else
21#include <linux/ext2_fs.h>
22#endif
23
24#include "ext2fs.h"
25
26#ifndef EXT2_FT_DIR
27#define EXT2_FT_DIR		2
28#endif
29
30/*
31 * Create new directory block
32 */
33errcode_t ext2fs_new_dir_block(ext2_filsys fs, ino_t dir_ino, ino_t parent_ino,
34			       char **block)
35{
36	struct ext2_dir_entry 	*dir = NULL;
37	errcode_t		retval;
38	char			*buf;
39	int			rec_len;
40	int			filetype = 0;
41
42	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
43
44	retval = ext2fs_get_mem(fs->blocksize, (void **) &buf);
45	if (retval)
46		return retval;
47	memset(buf, 0, fs->blocksize);
48	dir = (struct ext2_dir_entry *) buf;
49	dir->rec_len = fs->blocksize;
50
51	if (dir_ino) {
52		if (fs->super->s_feature_incompat &
53		    EXT2_FEATURE_INCOMPAT_FILETYPE)
54			filetype = EXT2_FT_DIR << 8;
55		/*
56		 * Set up entry for '.'
57		 */
58		dir->inode = dir_ino;
59		dir->name_len = 1 | filetype;
60		dir->name[0] = '.';
61		rec_len = dir->rec_len - EXT2_DIR_REC_LEN(1);
62		dir->rec_len = EXT2_DIR_REC_LEN(1);
63
64		/*
65		 * Set up entry for '..'
66		 */
67		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
68		dir->rec_len = rec_len;
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