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 Library 8 * General Public License, version 2. 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 */ 28 errcode_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 45 retval = ext2fs_set_rec_len(fs, fs->blocksize, dir); 46 if (retval) 47 return retval; 48 49 if (dir_ino) { 50 if (fs->super->s_feature_incompat & 51 EXT2_FEATURE_INCOMPAT_FILETYPE) 52 filetype = EXT2_FT_DIR << 8; 53 /* 54 * Set up entry for '.' 55 */ 56 dir->inode = dir_ino; 57 dir->name_len = 1 | filetype; 58 dir->name[0] = '.'; 59 rec_len = fs->blocksize - EXT2_DIR_REC_LEN(1); 60 dir->rec_len = EXT2_DIR_REC_LEN(1); 61 62 /* 63 * Set up entry for '..' 64 */ 65 dir = (struct ext2_dir_entry *) (buf + dir->rec_len); 66 retval = ext2fs_set_rec_len(fs, rec_len, dir); 67 if (retval) 68 return retval; 69 dir->inode = parent_ino; 70 dir->name_len = 2 | filetype; 71 dir->name[0] = '.'; 72 dir->name[1] = '.'; 73 74 } 75 *block = buf; 76 return 0; 77 } 78
