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 int drop_refcount = 0;
47
48 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
49
50 /*
51 * Create a new dir with inline data iff this feature is enabled
52 * and ino >= EXT2_FIRST_INO.
53 */
54 if ((!ino || ino >= EXT2_FIRST_INO(fs->super)) &&
55 ext2fs_has_feature_inline_data(fs->super))
56 inline_data = 1;
57
58 /*
59 * Allocate an inode, if necessary
60 */
61 if (!ino) {
62 retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755,
63 0, &ino);
64 if (retval)
65 goto cleanup;
66 }
67
68 /*
69 * Allocate a data block for the directory
70 */
71 memset(&inode, 0, sizeof(struct ext2_inode));
72 if (!inline_data) {
73 retval = ext2fs_new_block2(fs, ext2fs_find_inode_goal(fs, ino,
74 &inode,
75 0),
76 NULL, &blk);
77 if (retval)
78 goto cleanup;
79 }
80
81 /*
82 * Create a scratch template for the directory
83 */
84 if (inline_data)
85 retval = ext2fs_new_dir_inline_data(fs, ino, parent,
86 inode.i_block);
87 else
88 retval = ext2fs_new_dir_block(fs, ino, parent, &block);
89 if (retval)
90 goto cleanup;
91
92 /*
93 * Get the parent's inode, if necessary
94 */
95 if (parent != ino) {
96 retval = ext2fs_read_inode(fs, parent, &parent_inode);
97 if (retval)
98 goto cleanup;
99 } else
100 memset(&parent_inode, 0, sizeof(parent_inode));
101
102 /*
103 * Create the inode structure....
104 */
105 inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
106 inode.i_uid = inode.i_gid = 0;
107 if (inline_data) {
108 inode.i_flags |= EXT4_INLINE_DATA_FL;
109 inode.i_size = EXT4_MIN_INLINE_DATA_SIZE;
110 } else {
111 if (ext2fs_has_feature_extents(fs->super))
112 inode.i_flags |= EXT4_EXTENTS_FL;
113 else
114 inode.i_block[0] = blk;
115 inode.i_size = fs->blocksize;
116 ext2fs_iblk_set(fs, &inode, 1);
117 }
118 inode.i_links_count = 2;
119
120 /*
121 * Write out the inode and inode data block. The inode generation
122 * number is assigned by write_new_inode, which means that the call
123 * to write_dir_block must come after that.
124 */
125 retval = ext2fs_write_new_inode(fs, ino, &inode);
126 if (retval)
127 goto cleanup;
128 if (inline_data) {
129 /* init "system.data" for new dir */
130 retval = ext2fs_inline_data_init(fs, ino);
131 } else {
132 retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino);
133 if (retval)
134 goto cleanup;
135
136 if (ext2fs_has_feature_extents(fs->super)) {
137 retval = ext2fs_extent_open2(fs, ino, &inode, &handle);
138 if (retval)
139 goto cleanup;
140 retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
141 ext2fs_extent_free(handle);
142 if (retval)
143 goto cleanup;
144 }
145 }
146
147 /*
148 * Update accounting....
149 */
150 if (!inline_data)
151 ext2fs_block_alloc_stats2(fs, blk, +1);
152 ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
153 drop_refcount = 1;
154
155 /*
156 * Link the directory into the filesystem hierarchy
157 */
158 if (name) {
159 retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
160 &scratch_ino);
161 if (!retval) {
162 retval = EXT2_ET_DIR_EXISTS;
163 name = 0;
164 goto cleanup;
165 }
166 if (retval != EXT2_ET_FILE_NOT_FOUND)
167 goto cleanup;
168 retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
169 if (retval)
170 goto cleanup;
171 }
172
173 /*
174 * Update parent inode's counts
175 */
176 if (parent != ino) {
177 /* reload parent inode due to inline data */
178 retval = ext2fs_read_inode(fs, parent, &parent_inode);
179 if (retval)
180 goto cleanup;
181 parent_inode.i_links_count++;
182 retval = ext2fs_write_inode(fs, parent, &parent_inode);
183 if (retval)
184 goto cleanup;
185 }
186 drop_refcount = 0;
187
188 cleanup:
189 if (block)
190 ext2fs_free_mem(&block);
191 if (drop_refcount) {
192 if (!inline_data)
193 ext2fs_block_alloc_stats2(fs, blk, -1);
194 ext2fs_inode_alloc_stats2(fs, ino, -1, 1);
195 }
196 return retval;
197
198 }
199
200
201