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
  38         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  39
  40         retval = ext2fs_get_mem(fs->blocksize, &buf);
  41         if (retval)
  42                 return retval;
  43         memset(buf, 0, fs->blocksize);
  44         dir = (struct ext2_dir_entry *) buf;
  45
  46         retval = ext2fs_set_rec_len(fs, fs->blocksize, dir);
  47         if (retval) {
  48                 ext2fs_free_mem(&buf);
  49                 return retval;
  50         }
  51
  52         if (dir_ino) {
  53                 if (fs->super->s_feature_incompat &
  54                     EXT2_FEATURE_INCOMPAT_FILETYPE)
  55                         filetype = EXT2_FT_DIR << 8;
  56                 /*
  57                  * Set up entry for '.'
  58                  */
  59                 dir->inode = dir_ino;
  60                 dir->name_len = 1 | filetype;
  61                 dir->name[0] = '.';
  62                 rec_len = fs->blocksize - EXT2_DIR_REC_LEN(1);
  63                 dir->rec_len = EXT2_DIR_REC_LEN(1);
  64
  65                 /*
  66                  * Set up entry for '..'
  67                  */
  68                 dir = (struct ext2_dir_entry *) (buf + dir->rec_len);
  69                 retval = ext2fs_set_rec_len(fs, rec_len, dir);
  70                 if (retval) {
  71                         ext2fs_free_mem(&buf);
  72                         return retval;
  73                 }
  74                 dir->inode = parent_ino;
  75                 dir->name_len = 2 | filetype;
  76                 dir->name[0] = '.';
  77                 dir->name[1] = '.';
  78
  79         }
  80         *block = buf;
  81         return 0;
  82 }