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 "config.h" 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 */ 29 errcode_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 struct ext2_dir_entry_tail *t; 38 int csum_size = 0; 39 40 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 41 42 retval = ext2fs_get_mem(fs->blocksize, &buf); 43 if (retval) 44 return retval; 45 memset(buf, 0, fs->blocksize); 46 dir = (struct ext2_dir_entry *) buf; 47 48 if (ext2fs_has_feature_metadata_csum(fs->super)) 49 csum_size = sizeof(struct ext2_dir_entry_tail); 50 51 retval = ext2fs_set_rec_len(fs, fs->blocksize - csum_size, dir); 52 if (retval) { 53 ext2fs_free_mem(&buf); 54 return retval; 55 } 56 57 if (dir_ino) { 58 if (ext2fs_has_feature_filetype(fs->super)) 59 filetype = EXT2_FT_DIR; 60 /* 61 * Set up entry for '.' 62 */ 63 dir->inode = dir_ino; 64 ext2fs_dirent_set_name_len(dir, 1); 65 ext2fs_dirent_set_file_type(dir, filetype); 66 dir->name[0] = '.'; 67 rec_len = (fs->blocksize - csum_size) - EXT2_DIR_REC_LEN(1); 68 dir->rec_len = EXT2_DIR_REC_LEN(1); 69 70 /* 71 * Set up entry for '..' 72 */ 73 dir = (struct ext2_dir_entry *) (buf + dir->rec_len); 74 retval = ext2fs_set_rec_len(fs, rec_len, dir); 75 if (retval) { 76 ext2fs_free_mem(&buf); 77 return retval; 78 } 79 dir->inode = parent_ino; 80 ext2fs_dirent_set_name_len(dir, 2); 81 ext2fs_dirent_set_file_type(dir, filetype); 82 dir->name[0] = '.'; 83 dir->name[1] = '.'; 84 85 } 86 87 if (csum_size) { 88 t = EXT2_DIRENT_TAIL(buf, fs->blocksize); 89 ext2fs_initialize_dirent_tail(fs, t); 90 } 91 *block = buf; 92 return 0; 93 } 94 95 /* 96 * Create new directory on inline data 97 */ 98 errcode_t ext2fs_new_dir_inline_data(ext2_filsys fs, 99 ext2_ino_t dir_ino EXT2FS_ATTR((unused)), 100 ext2_ino_t parent_ino, __u32 *iblock) 101 { 102 struct ext2_dir_entry *dir = NULL; 103 errcode_t retval; 104 int rec_len; 105 106 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 107 108 iblock[0] = ext2fs_cpu_to_le32(parent_ino); 109 110 dir = (struct ext2_dir_entry *)((char *)iblock + 111 EXT4_INLINE_DATA_DOTDOT_SIZE); 112 dir->inode = 0; 113 rec_len = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DATA_DOTDOT_SIZE; 114 retval = ext2fs_set_rec_len(fs, rec_len, dir); 115 if (retval) 116 goto errout; 117 118 #ifdef WORDS_BIGENDIAN 119 retval = ext2fs_dirent_swab_out2(fs, (char *)dir, rec_len, 0); 120 if (retval) 121 goto errout; 122 #endif 123 124 errout: 125 return retval; 126 } 127
