mkdir.c revision 6a525069a99787ef3ae1156f12230044b3568f4b 
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 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#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	int			group;
43
44	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
45
46	/*
47	 * Allocate an inode, if necessary
48	 */
49	if (!ino) {
50		retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755,
51					  0, &ino);
52		if (retval)
53			goto cleanup;
54	}
55
56	/*
57	 * Allocate a data block for the directory
58	 */
59	retval = ext2fs_new_block(fs, 0, 0, &blk);
60	if (retval)
61		goto cleanup;
62
63	/*
64	 * Create a scratch template for the directory
65	 */
66	retval = ext2fs_new_dir_block(fs, ino, parent, &block);
67	if (retval)
68		goto cleanup;
69
70	/*
71	 * Get the parent's inode, if necessary
72	 */
73	if (parent != ino) {
74		retval = ext2fs_read_inode(fs, parent, &parent_inode);
75		if (retval)
76			goto cleanup;
77	} else
78		memset(&parent_inode, 0, sizeof(parent_inode));
79
80	/*
81	 * Create the inode structure....
82	 */
83	memset(&inode, 0, sizeof(struct ext2_inode));
84	inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
85	inode.i_uid = inode.i_gid = 0;
86	inode.i_blocks = fs->blocksize / 512;
87	inode.i_block[0] = blk;
88	inode.i_links_count = 2;
89	inode.i_ctime = inode.i_atime = inode.i_mtime = time(NULL);
90	inode.i_size = fs->blocksize;
91
92	/*
93	 * Write out the inode and inode data block
94	 */
95	retval = ext2fs_write_dir_block(fs, blk, block);
96	if (retval)
97		goto cleanup;
98	retval = ext2fs_write_inode(fs, ino, &inode);
99	if (retval)
100		goto cleanup;
101
102	/*
103	 * Link the directory into the filesystem hierarchy
104	 */
105	if (name) {
106		retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
107				       &scratch_ino);
108		if (!retval) {
109			retval = EXT2_ET_DIR_EXISTS;
110			name = 0;
111			goto cleanup;
112		}
113		if (retval != EXT2_ET_FILE_NOT_FOUND)
114			goto cleanup;
115		retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
116		if (retval)
117			goto cleanup;
118	}
119
120	/*
121	 * Update parent inode's counts
122	 */
123	if (parent != ino) {
124		parent_inode.i_links_count++;
125		retval = ext2fs_write_inode(fs, parent, &parent_inode);
126		if (retval)
127			goto cleanup;
128	}
129
130	/*
131	 * Update accounting....
132	 */
133	ext2fs_mark_block_bitmap(fs->block_map, blk);
134	ext2fs_mark_bb_dirty(fs);
135	ext2fs_mark_inode_bitmap(fs->inode_map, ino);
136	ext2fs_mark_ib_dirty(fs);
137
138	group = ext2fs_group_of_blk(fs, blk);
139	fs->group_desc[group].bg_free_blocks_count--;
140	group = ext2fs_group_of_ino(fs, ino);
141	fs->group_desc[group].bg_free_inodes_count--;
142	fs->group_desc[group].bg_used_dirs_count++;
143	fs->super->s_free_blocks_count--;
144	fs->super->s_free_inodes_count--;
145	ext2fs_mark_super_dirty(fs);
146
147cleanup:
148	if (block)
149		ext2fs_free_mem((void **) &block);
150	return retval;
151
152}
153
154
155