mkdir.c revision e0ed7404719a9ddd2ba427a80db5365c8bad18c0 
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	ext2_extent_handle_t	handle;
37	errcode_t		retval;
38	struct ext2_inode	parent_inode, inode;
39	ext2_ino_t		ino = inum;
40	ext2_ino_t		scratch_ino;
41	blk64_t			blk;
42	char			*block = 0;
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_block2(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	ext2fs_iblk_set(fs, &inode, 1);
87	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
88		inode.i_flags |= EXT4_EXTENTS_FL;
89	else
90		inode.i_block[0] = blk;
91	inode.i_links_count = 2;
92	inode.i_size = fs->blocksize;
93
94	/*
95	 * Write out the inode and inode data block
96	 */
97	retval = ext2fs_write_dir_block(fs, blk, block);
98	if (retval)
99		goto cleanup;
100	retval = ext2fs_write_new_inode(fs, ino, &inode);
101	if (retval)
102		goto cleanup;
103
104	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
105		retval = ext2fs_extent_open2(fs, ino, &inode, &handle);
106		if (retval)
107			goto cleanup;
108		retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
109		ext2fs_extent_free(handle);
110		if (retval)
111			goto cleanup;
112	}
113
114	/*
115	 * Link the directory into the filesystem hierarchy
116	 */
117	if (name) {
118		retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
119				       &scratch_ino);
120		if (!retval) {
121			retval = EXT2_ET_DIR_EXISTS;
122			name = 0;
123			goto cleanup;
124		}
125		if (retval != EXT2_ET_FILE_NOT_FOUND)
126			goto cleanup;
127		retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
128		if (retval)
129			goto cleanup;
130	}
131
132	/*
133	 * Update parent inode's counts
134	 */
135	if (parent != ino) {
136		parent_inode.i_links_count++;
137		retval = ext2fs_write_inode(fs, parent, &parent_inode);
138		if (retval)
139			goto cleanup;
140	}
141
142	/*
143	 * Update accounting....
144	 */
145	ext2fs_block_alloc_stats2(fs, blk, +1);
146	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
147
148cleanup:
149	if (block)
150		ext2fs_free_mem(&block);
151	return retval;
152
153}
154
155
156