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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  */
ext2fs_new_dir_block(ext2_filsys fs,ext2_ino_t dir_ino,ext2_ino_t parent_ino,char ** block)29 errcode_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 	struct ext2_dir_entry_tail	*t;
38 	int			csum_size = 0;
39 
40 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
41 
42 	retval = ext2fs_get_mem(fs->blocksize, &buf);
43 	if (retval)
44 		return retval;
45 	memset(buf, 0, fs->blocksize);
46 	dir = (struct ext2_dir_entry *) buf;
47 
48 	if (ext2fs_has_feature_metadata_csum(fs->super))
49 		csum_size = sizeof(struct ext2_dir_entry_tail);
50 
51 	retval = ext2fs_set_rec_len(fs, fs->blocksize - csum_size, dir);
52 	if (retval) {
53 		ext2fs_free_mem(&buf);
54 		return retval;
55 	}
56 
57 	if (dir_ino) {
58 		if (ext2fs_has_feature_filetype(fs->super))
59 			filetype = EXT2_FT_DIR;
60 		/*
61 		 * Set up entry for '.'
62 		 */
63 		dir->inode = dir_ino;
64 		ext2fs_dirent_set_name_len(dir, 1);
65 		ext2fs_dirent_set_file_type(dir, filetype);
66 		dir->name[0] = '.';
67 		rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1);
68 		dir->rec_len = EXT2_DIR_REC_LEN(1);
69 
70 		/*
71 		 * Set up entry for '..'
72 		 */
73 		dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
74 		retval = ext2fs_set_rec_len(fs, rec_len, dir);
75 		if (retval) {
76 			ext2fs_free_mem(&buf);
77 			return retval;
78 		}
79 		dir->inode = parent_ino;
80 		ext2fs_dirent_set_name_len(dir, 2);
81 		ext2fs_dirent_set_file_type(dir, filetype);
82 		dir->name[0] = '.';
83 		dir->name[1] = '.';
84 
85 	}
86 
87 	if (csum_size) {
88 		t = EXT2_DIRENT_TAIL(buf, fs->blocksize);
89 		ext2fs_initialize_dirent_tail(fs, t);
90 	}
91 	*block = buf;
92 	return 0;
93 }
94 
95 /*
96  * Create new directory on inline data
97  */
ext2fs_new_dir_inline_data(ext2_filsys fs,ext2_ino_t dir_ino EXT2FS_ATTR ((unused)),ext2_ino_t parent_ino,__u32 * iblock)98 errcode_t ext2fs_new_dir_inline_data(ext2_filsys fs,
99 				     ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
100 				     ext2_ino_t parent_ino, __u32 *iblock)
101 {
102 	struct ext2_dir_entry 	*dir = NULL;
103 	errcode_t		retval;
104 	int			rec_len;
105 
106 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
107 
108 	iblock[0] = ext2fs_cpu_to_le32(parent_ino);
109 
110 	dir = (struct ext2_dir_entry *)((char *)iblock +
111 					EXT4_INLINE_DATA_DOTDOT_SIZE);
112 	dir->inode = 0;
113 	rec_len = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DATA_DOTDOT_SIZE;
114 	retval = ext2fs_set_rec_len(fs, rec_len, dir);
115 	if (retval)
116 		goto errout;
117 
118 #ifdef WORDS_BIGENDIAN
119 	retval = ext2fs_dirent_swab_out2(fs, (char *)dir, rec_len, 0);
120 	if (retval)
121 		goto errout;
122 #endif
123 
124 errout:
125 	return retval;
126 }
127