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, n: raw_inode->magic1); |
23 | befs_inode_addr ino_num = fsrun_to_cpu(sb, n: raw_inode->inode_num); |
24 | u32 flags = fs32_to_cpu(sb, n: raw_inode->flags); |
25 | |
26 | /* check magic header. */ |
27 | if (magic1 != BEFS_INODE_MAGIC1) { |
28 | befs_error(sb, |
29 | fmt: "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, iaddr: &ino_num)) { |
38 | befs_error(sb, fmt: "inode blocknr field disagrees with vfs " |
39 | "VFS: %lu, Inode %lu" , (unsigned long) |
40 | inode, (unsigned long)iaddr2blockno(sb, iaddr: &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, fmt: "inode is not used - inode = %lu" , |
50 | (unsigned long)inode); |
51 | return BEFS_BAD_INODE; |
52 | } |
53 | |
54 | return BEFS_OK; |
55 | } |
56 | |