fs/befs/inode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * inode.c
   4  *
   5  * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
   6  */
   7
   8 #include <linux/fs.h>
   9
  10 #include "befs.h"
  11 #include "inode.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",
  30                            (unsigned long)inode);
  31                 return BEFS_BAD_INODE;
  32         }
  33
  34         /*
  35          * Sanity check2: inodes store their own block address. Check it.
  36          */
  37         if (inode != iaddr2blockno(sb, &ino_num)) {
  38                 befs_error(sb, "inode blocknr field disagrees with vfs "
  39                            "VFS: %lu, Inode %lu", (unsigned long)
  40                            inode, (unsigned long)iaddr2blockno(sb, &ino_num));
  41                 return BEFS_BAD_INODE;
  42         }
  43
  44         /*
  45          * check flag
  46          */
  47
  48         if (!(flags & BEFS_INODE_IN_USE)) {
  49                 befs_error(sb, "inode is not used - inode = %lu",
  50                            (unsigned long)inode);
  51                 return BEFS_BAD_INODE;
  52         }
  53
  54         return BEFS_OK;
  55 }