fs/tfs/super.c

   1 #include <stdio.h>
   2 #include <malloc.h>
   3 #include <tfs.h>
   4 #include <fd.h>
   5
   6
   7 struct tfs_sb_info * tfs_mount(void)
   8 {
   9         struct tfs_sb_info *sbi;
  10         struct tfs_super_block sb;
  11
  12         /* Read the sector */
  13         floppy_read(TFS_SB_SECTOR, &sb);
  14         if (sb.s_magic != TFS_MAGIC) {
  15                 printk("Trying to mount not tfs file system!\n");
  16                 return NULL;
  17         }
  18
  19         sbi = malloc(sizeof(*sbi));
  20         if (!sbi) {
  21                 printk("Malloc from tfs sbi object failed!\n");
  22                 return NULL;
  23         }
  24
  25         sbi->s_block_shift       = sb.s_block_shift;
  26         sbi->s_block_size        = 1 << sbi->s_block_shift;
  27         sbi->s_blocks_count      = sb.s_blocks_count;
  28         sbi->s_inodes_count      = sb.s_inodes_count;
  29         sbi->s_free_blocks_count = sb.s_free_blocks_count;
  30         sbi->s_free_inodes_count = sb.s_free_inodes_count;
  31
  32
  33         sbi->s_inode_bitmap = sb.s_inode_bitmap;
  34         sbi->s_block_bitmap = sb.s_block_bitmap;
  35         sbi->s_inode_table  = sb.s_inode_table;
  36         sbi->s_data_area    = sb.s_data_area;
  37
  38         sbi->s_inode_bitmap_count = sb.s_block_bitmap - sb.s_inode_bitmap;
  39         sbi->s_block_bitmap_count = sb.s_inode_table - sb.s_block_bitmap;
  40         sbi->s_inode_table_count  = sb.s_data_area - sb.s_inode_table;
  41
  42
  43         sbi->s_offset = sb.s_offset;
  44
  45         sbi->s_inodes_per_block = sbi->s_block_size / sizeof(struct tfs_inode);
  46
  47         return sbi;
  48 }