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