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-rw-r--r--lib/ext2fs/newdir.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/lib/ext2fs/newdir.c b/lib/ext2fs/newdir.c
new file mode 100644
index 0000000..7f47285
--- /dev/null
+++ b/lib/ext2fs/newdir.c
@@ -0,0 +1,126 @@
+/*
+ * newdir.c --- create a new directory block
+ *
+ * Copyright (C) 1994, 1995 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+#ifndef EXT2_FT_DIR
+#define EXT2_FT_DIR 2
+#endif
+
+/*
+ * Create new directory block
+ */
+errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
+ ext2_ino_t parent_ino, char **block)
+{
+ struct ext2_dir_entry *dir = NULL;
+ errcode_t retval;
+ char *buf;
+ int rec_len;
+ int filetype = 0;
+ struct ext2_dir_entry_tail *t;
+ int csum_size = 0;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ retval = ext2fs_get_mem(fs->blocksize, &buf);
+ if (retval)
+ return retval;
+ memset(buf, 0, fs->blocksize);
+ dir = (struct ext2_dir_entry *) buf;
+
+ if (ext2fs_has_feature_metadata_csum(fs->super))
+ csum_size = sizeof(struct ext2_dir_entry_tail);
+
+ retval = ext2fs_set_rec_len(fs, fs->blocksize - csum_size, dir);
+ if (retval) {
+ ext2fs_free_mem(&buf);
+ return retval;
+ }
+
+ if (dir_ino) {
+ if (ext2fs_has_feature_filetype(fs->super))
+ filetype = EXT2_FT_DIR;
+ /*
+ * Set up entry for '.'
+ */
+ dir->inode = dir_ino;
+ ext2fs_dirent_set_name_len(dir, 1);
+ ext2fs_dirent_set_file_type(dir, filetype);
+ dir->name[0] = '.';
+ rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1);
+ dir->rec_len = EXT2_DIR_REC_LEN(1);
+
+ /*
+ * Set up entry for '..'
+ */
+ dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
+ retval = ext2fs_set_rec_len(fs, rec_len, dir);
+ if (retval) {
+ ext2fs_free_mem(&buf);
+ return retval;
+ }
+ dir->inode = parent_ino;
+ ext2fs_dirent_set_name_len(dir, 2);
+ ext2fs_dirent_set_file_type(dir, filetype);
+ dir->name[0] = '.';
+ dir->name[1] = '.';
+
+ }
+
+ if (csum_size) {
+ t = EXT2_DIRENT_TAIL(buf, fs->blocksize);
+ ext2fs_initialize_dirent_tail(fs, t);
+ }
+ *block = buf;
+ return 0;
+}
+
+/*
+ * Create new directory on inline data
+ */
+errcode_t ext2fs_new_dir_inline_data(ext2_filsys fs,
+ ext2_ino_t dir_ino EXT2FS_ATTR((unused)),
+ ext2_ino_t parent_ino, __u32 *iblock)
+{
+ struct ext2_dir_entry *dir = NULL;
+ errcode_t retval;
+ int rec_len;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ iblock[0] = ext2fs_cpu_to_le32(parent_ino);
+
+ dir = (struct ext2_dir_entry *)((char *)iblock +
+ EXT4_INLINE_DATA_DOTDOT_SIZE);
+ dir->inode = 0;
+ rec_len = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DATA_DOTDOT_SIZE;
+ retval = ext2fs_set_rec_len(fs, rec_len, dir);
+ if (retval)
+ goto errout;
+
+#ifdef WORDS_BIGENDIAN
+ retval = ext2fs_dirent_swab_out2(fs, (char *)dir, rec_len, 0);
+ if (retval)
+ goto errout;
+#endif
+
+errout:
+ return retval;
+}