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