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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 "config.h"
13 #include <stdio.h>
14 #include <string.h>
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #include <fcntl.h>
19 #include <time.h>
20 #if HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26 
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29 #include "ext2fsP.h"
30 
31 #ifndef EXT2_FT_DIR
32 #define EXT2_FT_DIR		2
33 #endif
34 
ext2fs_mkdir(ext2_filsys fs,ext2_ino_t parent,ext2_ino_t inum,const char * name)35 errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
36 		       const char *name)
37 {
38 	ext2_extent_handle_t	handle;
39 	errcode_t		retval;
40 	struct ext2_inode	parent_inode, inode;
41 	ext2_ino_t		ino = inum;
42 	ext2_ino_t		scratch_ino;
43 	blk64_t			blk;
44 	char			*block = 0;
45 	int			inline_data = 0;
46 
47 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
48 
49 	/*
50 	 * Create a new dir with inline data iff this feature is enabled
51 	 * and ino >= EXT2_FIRST_INO.
52 	 */
53 	if ((!ino || ino >= EXT2_FIRST_INO(fs->super)) &&
54 	    ext2fs_has_feature_inline_data(fs->super))
55 		inline_data = 1;
56 
57 	/*
58 	 * Allocate an inode, if necessary
59 	 */
60 	if (!ino) {
61 		retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755,
62 					  0, &ino);
63 		if (retval)
64 			goto cleanup;
65 	}
66 
67 	/*
68 	 * Allocate a data block for the directory
69 	 */
70 	memset(&inode, 0, sizeof(struct ext2_inode));
71 	if (!inline_data) {
72 		retval = ext2fs_new_block2(fs, ext2fs_find_inode_goal(fs, ino,
73 								      &inode,
74 								      0),
75 					   NULL, &blk);
76 		if (retval)
77 			goto cleanup;
78 	}
79 
80 	/*
81 	 * Create a scratch template for the directory
82 	 */
83 	if (inline_data)
84 		retval = ext2fs_new_dir_inline_data(fs, ino, parent,
85 						    inode.i_block);
86 	else
87 		retval = ext2fs_new_dir_block(fs, ino, parent, &block);
88 	if (retval)
89 		goto cleanup;
90 
91 	/*
92 	 * Get the parent's inode, if necessary
93 	 */
94 	if (parent != ino) {
95 		retval = ext2fs_read_inode(fs, parent, &parent_inode);
96 		if (retval)
97 			goto cleanup;
98 	} else
99 		memset(&parent_inode, 0, sizeof(parent_inode));
100 
101 	/*
102 	 * Create the inode structure....
103 	 */
104 	inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
105 	inode.i_uid = inode.i_gid = 0;
106 	if (inline_data) {
107 		inode.i_flags |= EXT4_INLINE_DATA_FL;
108 		inode.i_size = EXT4_MIN_INLINE_DATA_SIZE;
109 	} else {
110 		if (ext2fs_has_feature_extents(fs->super))
111 			inode.i_flags |= EXT4_EXTENTS_FL;
112 		else
113 			inode.i_block[0] = blk;
114 		inode.i_size = fs->blocksize;
115 		ext2fs_iblk_set(fs, &inode, 1);
116 	}
117 	inode.i_links_count = 2;
118 
119 	/*
120 	 * Write out the inode and inode data block.  The inode generation
121 	 * number is assigned by write_new_inode, which means that the call
122 	 * to write_dir_block must come after that.
123 	 */
124 	retval = ext2fs_write_new_inode(fs, ino, &inode);
125 	if (retval)
126 		goto cleanup;
127 	if (inline_data) {
128 		/* init "system.data" for new dir */
129 		retval = ext2fs_inline_data_init(fs, ino);
130 	} else {
131 		retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino);
132 		if (retval)
133 			goto cleanup;
134 
135 		if (ext2fs_has_feature_extents(fs->super)) {
136 			retval = ext2fs_extent_open2(fs, ino, &inode, &handle);
137 			if (retval)
138 				goto cleanup;
139 			retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
140 			ext2fs_extent_free(handle);
141 			if (retval)
142 				goto cleanup;
143 		}
144 	}
145 
146 	/*
147 	 * Link the directory into the filesystem hierarchy
148 	 */
149 	if (name) {
150 		retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
151 				       &scratch_ino);
152 		if (!retval) {
153 			retval = EXT2_ET_DIR_EXISTS;
154 			name = 0;
155 			goto cleanup;
156 		}
157 		if (retval != EXT2_ET_FILE_NOT_FOUND)
158 			goto cleanup;
159 		retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
160 		if (retval)
161 			goto cleanup;
162 	}
163 
164 	/*
165 	 * Update parent inode's counts
166 	 */
167 	if (parent != ino) {
168 		/* reload parent inode due to inline data */
169 		retval = ext2fs_read_inode(fs, parent, &parent_inode);
170 		if (retval)
171 			goto cleanup;
172 		parent_inode.i_links_count++;
173 		retval = ext2fs_write_inode(fs, parent, &parent_inode);
174 		if (retval)
175 			goto cleanup;
176 	}
177 
178 	/*
179 	 * Update accounting....
180 	 */
181 	if (!inline_data)
182 		ext2fs_block_alloc_stats2(fs, blk, +1);
183 	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
184 
185 cleanup:
186 	if (block)
187 		ext2fs_free_mem(&block);
188 	return retval;
189 
190 }
191 
192 
193