lib/ext2fs/alloc_tables.c

   1 /*
   2  * alloc_tables.c --- Allocate tables for a newly initialized
   3  * filesystem.  Used by mke2fs when initializing a filesystem
   4  *
   5  * Copyright (C) 1996 Theodore Ts'o.
   6  *
   7  * %Begin-Header%
   8  * This file may be redistributed under the terms of the GNU Public
   9  * License.
  10  * %End-Header%
  11  */
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <fcntl.h>
  18 #include <time.h>
  19 #include <sys/stat.h>
  20 #include <sys/types.h>
  21 #if HAVE_ERRNO_H
  22 #include <errno.h>
  23 #endif
  24
  25 #include <linux/ext2_fs.h>
  26
  27 #include "ext2fs.h"
  28
  29 errcode_t ext2fs_allocate_tables(ext2_filsys fs)
  30 {
  31         errcode_t       retval;
  32         blk_t           group_blk, last_blk, new_blk, blk;
  33         int             i, j;
  34
  35         group_blk = fs->super->s_first_data_block;
  36         for (i = 0; i < fs->group_desc_count; i++) {
  37                 last_blk = group_blk + fs->super->s_blocks_per_group;
  38
  39                 /*
  40                  * Allocate the block bitmap
  41                  */
  42                 retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
  43                                                 1, fs->block_map, &new_blk);
  44                 if (retval)
  45                         return retval;
  46                 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
  47                 fs->group_desc[i].bg_block_bitmap = new_blk;
  48
  49                 /*
  50                  * ... and the inode bitmap
  51                  */
  52                 retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
  53                                                 1, fs->block_map, &new_blk);
  54                 if (retval)
  55                         return retval;
  56                 ext2fs_mark_block_bitmap(fs->block_map, new_blk);
  57                 fs->group_desc[i].bg_inode_bitmap = new_blk;
  58
  59                 /*
  60                  * Finally, allocate the inode table
  61                  */
  62                 retval = ext2fs_get_free_blocks(fs, group_blk, last_blk,
  63                                                 fs->inode_blocks_per_group,
  64                                                 fs->block_map, &new_blk);
  65                 if (retval)
  66                         return retval;
  67                 for (j=0, blk = new_blk;
  68                      j < fs->inode_blocks_per_group;
  69                      j++, blk++)
  70                         ext2fs_mark_block_bitmap(fs->block_map, blk);
  71                 fs->group_desc[i].bg_inode_table = new_blk;
  72
  73                 /*
  74                  * Increment the start of the block group
  75                  */
  76                 group_blk += fs->super->s_blocks_per_group;
  77         }
  78         return 0;
  79 }
  80