| /* |
| * 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 (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, |
| EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) |
| 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 (fs->super->s_feature_incompat & |
| EXT2_FEATURE_INCOMPAT_FILETYPE) |
| 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; |
| } |