newdir.c revision c4e3d3f374b409500e3dd05c0b0eca6ac98a6b4e
1/* 2 * newdir.c --- create a new directory block 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 Public 8 * License. 9 * %End-Header% 10 */ 11 12#include <stdio.h> 13#include <string.h> 14#if HAVE_UNISTD_H 15#include <unistd.h> 16#endif 17 18#include "ext2_fs.h" 19#include "ext2fs.h" 20 21#ifndef EXT2_FT_DIR 22#define EXT2_FT_DIR 2 23#endif 24 25/* 26 * Create new directory block 27 */ 28errcode_t ext2fs_new_dir_block(ext2_filsys fs, ext2_ino_t dir_ino, 29 ext2_ino_t parent_ino, char **block) 30{ 31 struct ext2_dir_entry *dir = NULL; 32 errcode_t retval; 33 char *buf; 34 int rec_len; 35 int filetype = 0; 36 37 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 38 39 retval = ext2fs_get_mem(fs->blocksize, &buf); 40 if (retval) 41 return retval; 42 memset(buf, 0, fs->blocksize); 43 dir = (struct ext2_dir_entry *) buf; 44 dir->rec_len = fs->blocksize; 45 46 if (dir_ino) { 47 if (fs->super->s_feature_incompat & 48 EXT2_FEATURE_INCOMPAT_FILETYPE) 49 filetype = EXT2_FT_DIR << 8; 50 /* 51 * Set up entry for '.' 52 */ 53 dir->inode = dir_ino; 54 dir->name_len = 1 | filetype; 55 dir->name[0] = '.'; 56 rec_len = dir->rec_len - EXT2_DIR_REC_LEN(1); 57 dir->rec_len = EXT2_DIR_REC_LEN(1); 58 59 /* 60 * Set up entry for '..' 61 */ 62 dir = (struct ext2_dir_entry *) (buf + dir->rec_len); 63 dir->rec_len = rec_len; 64 dir->inode = parent_ino; 65 dir->name_len = 2 | filetype; 66 dir->name[0] = '.'; 67 dir->name[1] = '.'; 68 69 } 70 *block = buf; 71 return 0; 72} 73