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