lib/ext2fs/newdir.c

   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_NAME_LEN(1);
  68                 dir->rec_len = EXT2_DIR_NAME_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 }