release/src-rt-6.x/linux/linux-2.6/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 */
  17 int
  18 befs_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 }