1 /*
2 * mkdir.c --- make a directory in the filesystem
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 <stdio.h>
13 #include <string.h>
14 #if HAVE_UNISTD_H
15 #include <unistd.h>
16 #endif
17 #include <fcntl.h>
18 #include <time.h>
19 #if HAVE_SYS_STAT_H
20 #include <sys/stat.h>
21 #endif
22 #if HAVE_SYS_TYPES_H
23 #include <sys/types.h>
24 #endif
25
26 #include "ext2_fs.h"
27 #include "ext2fs.h"
28
29 #ifndef EXT2_FT_DIR
30 #define EXT2_FT_DIR 2
31 #endif
32
ext2fs_mkdir(ext2_filsys fs,ext2_ino_t parent,ext2_ino_t inum,const char * name)33 errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
34 const char *name)
35 {
36 errcode_t retval;
37 struct ext2_inode parent_inode, inode;
38 ext2_ino_t ino = inum;
39 ext2_ino_t scratch_ino;
40 blk_t blk;
41 char *block = 0;
42
43 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
44
45 /*
46 * Allocate an inode, if necessary
47 */
48 if (!ino) {
49 retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755,
50 0, &ino);
51 if (retval)
52 goto cleanup;
53 }
54
55 /*
56 * Allocate a data block for the directory
57 */
58 retval = ext2fs_new_block(fs, 0, 0, &blk);
59 if (retval)
60 goto cleanup;
61
62 /*
63 * Create a scratch template for the directory
64 */
65 retval = ext2fs_new_dir_block(fs, ino, parent, &block);
66 if (retval)
67 goto cleanup;
68
69 /*
70 * Get the parent's inode, if necessary
71 */
72 if (parent != ino) {
73 retval = ext2fs_read_inode(fs, parent, &parent_inode);
74 if (retval)
75 goto cleanup;
76 } else
77 memset(&parent_inode, 0, sizeof(parent_inode));
78
79 /*
80 * Create the inode structure....
81 */
82 memset(&inode, 0, sizeof(struct ext2_inode));
83 inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
84 inode.i_uid = inode.i_gid = 0;
85 ext2fs_iblk_set(fs, &inode, 1);
86 inode.i_block[0] = blk;
87 inode.i_links_count = 2;
88 inode.i_size = fs->blocksize;
89
90 /*
91 * Write out the inode and inode data block
92 */
93 retval = ext2fs_write_dir_block(fs, blk, block);
94 if (retval)
95 goto cleanup;
96 retval = ext2fs_write_new_inode(fs, ino, &inode);
97 if (retval)
98 goto cleanup;
99
100 /*
101 * Link the directory into the filesystem hierarchy
102 */
103 if (name) {
104 retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
105 &scratch_ino);
106 if (!retval) {
107 retval = EXT2_ET_DIR_EXISTS;
108 name = 0;
109 goto cleanup;
110 }
111 if (retval != EXT2_ET_FILE_NOT_FOUND)
112 goto cleanup;
113 retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
114 if (retval)
115 goto cleanup;
116 }
117
118 /*
119 * Update parent inode's counts
120 */
121 if (parent != ino) {
122 parent_inode.i_links_count++;
123 retval = ext2fs_write_inode(fs, parent, &parent_inode);
124 if (retval)
125 goto cleanup;
126 }
127
128 /*
129 * Update accounting....
130 */
131 ext2fs_block_alloc_stats(fs, blk, +1);
132 ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
133
134 cleanup:
135 if (block)
136 ext2fs_free_mem(&block);
137 return retval;
138
139 }
140
141
142