super.c

   1 #include <stdio.h>
   2 #include <malloc.h>
   3
   4 #include "tfs.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         if (read_sector(1, &sb, 1) == -1) {
  14                 printf("Read the tfs super block error!\n");
  15                 return NULL;
  16         }
  17         if (sb.s_magic != TFS_MAGIC) {
  18                 printf("Trying to mount not tfs file system!\n");
  19                 return NULL;
  20         }
  21
  22         sbi = malloc(sizeof(*sbi));
  23         if (!sbi) {
  24                 printf("Malloc from tfs sbi object failed!\n");
  25                 return NULL;
  26         }
  27
  28         sbi->s_block_shift       = sb.s_block_shift;
  29         sbi->s_block_size        = 1 << sbi->s_block_shift;
  30         sbi->s_blocks_count      = sb.s_blocks_count;
  31         sbi->s_inodes_count      = sb.s_inodes_count;
  32         sbi->s_free_blocks_count = sb.s_free_blocks_count;
  33         sbi->s_free_inodes_count = sb.s_free_inodes_count;
  34
  35
  36         sbi->s_inode_bitmap = sb.s_inode_bitmap;
  37         sbi->s_block_bitmap = sb.s_block_bitmap;
  38         sbi->s_inode_table  = sb.s_inode_table;
  39         sbi->s_data_area    = sb.s_data_area;
  40
  41         sbi->s_inode_bitmap_count = sb.s_block_bitmap - sb.s_inode_bitmap;
  42         sbi->s_block_bitmap_count = sb.s_inode_table - sb.s_block_bitmap;
  43         sbi->s_inode_table_count  = sb.s_data_area - sb.s_inode_table;
  44
  45
  46         sbi->s_offset = sb.s_offset;
  47
  48         sbi->s_inodes_per_block = sbi->s_block_size / sizeof(struct tfs_inode);
  49
  50         return sbi;
  51 }
  52
  53
  54
  55
  56
  57
  58 struct tfs_sb_info * tfs_mount_by_fsname(const char *fs)
  59 {
  60         open_fs(fs);
  61
  62         return tfs_mount();
  63 }