LXR linux/fs/befs/inode.c

   1/*
   2 * inode.c
   3 * 
   4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
   5 */
   6
   7#include <linux/fs.h>
   8
   9#include "befs.h"
  10#include "inode.h"
  11
  12/*
  13        Validates the correctness of the befs inode
  14        Returns BEFS_OK if the inode should be used, otherwise
  15        returns BEFS_BAD_INODE
  16*/
  17int
  18befs_check_inode(struct super_block *sb, befs_inode * raw_inode,
  19                 befs_blocknr_t inode)
  20{
  21        u32 magic1 = fs32_to_cpu(sb, raw_inode->magic1);
  22        befs_inode_addr ino_num = fsrun_to_cpu(sb, raw_inode->inode_num);
  23        u32 flags = fs32_to_cpu(sb, raw_inode->flags);
  24
  25        /* check magic header. */
  26        if (magic1 != BEFS_INODE_MAGIC1) {
  27                befs_error(sb,
  28                           "Inode has a bad magic header - inode = %lu", inode);
  29                return BEFS_BAD_INODE;
  30        }
  31
  32        /*
  33         * Sanity check2: inodes store their own block address. Check it.
  34         */
  35        if (inode != iaddr2blockno(sb, &ino_num)) {
  36                befs_error(sb, "inode blocknr field disagrees with vfs "
  37                           "VFS: %lu, Inode %lu",
  38                           inode, iaddr2blockno(sb, &ino_num));
  39                return BEFS_BAD_INODE;
  40        }
  41
  42        /*
  43         * check flag
  44         */
  45
  46        if (!(flags & BEFS_INODE_IN_USE)) {
  47                befs_error(sb, "inode is not used - inode = %lu", inode);
  48                return BEFS_BAD_INODE;
  49        }
  50
  51        return BEFS_OK;
  52}
  53