xref: /linux/fs/befs/inode.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
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 }
54