LXR busybox/e2fsprogs/old_e2fsprogs/ext2fs/newdir.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * newdir.c --- create a new directory block
   4 *
   5 * Copyright (C) 1994, 1995 Theodore Ts'o.
   6 *
   7 * %Begin-Header%
   8 * This file may be redistributed under the terms of the GNU Public
   9 * License.
  10 * %End-Header%
  11 */
  12
  13#include <stdio.h>
  14#include <string.h>
  15#if HAVE_UNISTD_H
  16#include <unistd.h>
  17#endif
  18
  19#include "ext2_fs.h"
  20#include "ext2fs.h"
  21
  22#ifndef EXT2_FT_DIR
  23#define EXT2_FT_DIR             2
  24#endif
  25
  26/*
  27 * Create new directory block
  28 */
  29errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino,
  30                               ext2_ino_t parent_ino, char **block)
  31{
  32        struct ext2_dir_entry   *dir = NULL;
  33        errcode_t               retval;
  34        char                    *buf;
  35        int                     rec_len;
  36        int                     filetype = 0;
  37
  38        EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  39
  40        retval = ext2fs_get_mem(fs->blocksize, &buf);
  41        if (retval)
  42                return retval;
  43        memset(buf, 0, fs->blocksize);
  44        dir = (struct ext2_dir_entry *) buf;
  45        dir->rec_len = fs->blocksize;
  46
  47        if (dir_ino) {
  48                if (fs->super->s_feature_incompat &
  49                    EXT2_FEATURE_INCOMPAT_FILETYPE)
  50                        filetype = EXT2_FT_DIR << 8;
  51                /*
  52                 * Set up entry for '.'
  53                 */
  54                dir->inode = dir_ino;
  55                dir->name_len = 1 | filetype;
  56                dir->name[0] = '.';
  57                rec_len = dir->rec_len - EXT2_DIR_REC_LEN(1);
  58                dir->rec_len = EXT2_DIR_REC_LEN(1);
  59
  60                /*
  61                 * Set up entry for '..'
  62                 */
  63                dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
  64                dir->rec_len = rec_len;
  65                dir->inode = parent_ino;
  66                dir->name_len = 2 | filetype;
  67                dir->name[0] = '.';
  68                dir->name[1] = '.';
  69        }
  70        *block = buf;
  71        return 0;
  72}
  73