mkdir.c revision a6ce1349539f866334ef3d5758bc2ee44a454acd 
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
33errcode_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
134cleanup:
135	if (block)
136		ext2fs_free_mem(&block);
137	return retval;
138
139}
140
141
142