1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * inode.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/fs.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include "befs.h"
11*4882a593Smuzhiyun #include "inode.h"
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun /*
14*4882a593Smuzhiyun * Validates the correctness of the befs inode
15*4882a593Smuzhiyun * Returns BEFS_OK if the inode should be used, otherwise
16*4882a593Smuzhiyun * returns BEFS_BAD_INODE
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun int
befs_check_inode(struct super_block * sb,befs_inode * raw_inode,befs_blocknr_t inode)19*4882a593Smuzhiyun befs_check_inode(struct super_block *sb, befs_inode *raw_inode,
20*4882a593Smuzhiyun befs_blocknr_t inode)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun u32 magic1 = fs32_to_cpu(sb, raw_inode->magic1);
23*4882a593Smuzhiyun befs_inode_addr ino_num = fsrun_to_cpu(sb, raw_inode->inode_num);
24*4882a593Smuzhiyun u32 flags = fs32_to_cpu(sb, raw_inode->flags);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /* check magic header. */
27*4882a593Smuzhiyun if (magic1 != BEFS_INODE_MAGIC1) {
28*4882a593Smuzhiyun befs_error(sb,
29*4882a593Smuzhiyun "Inode has a bad magic header - inode = %lu",
30*4882a593Smuzhiyun (unsigned long)inode);
31*4882a593Smuzhiyun return BEFS_BAD_INODE;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /*
35*4882a593Smuzhiyun * Sanity check2: inodes store their own block address. Check it.
36*4882a593Smuzhiyun */
37*4882a593Smuzhiyun if (inode != iaddr2blockno(sb, &ino_num)) {
38*4882a593Smuzhiyun befs_error(sb, "inode blocknr field disagrees with vfs "
39*4882a593Smuzhiyun "VFS: %lu, Inode %lu", (unsigned long)
40*4882a593Smuzhiyun inode, (unsigned long)iaddr2blockno(sb, &ino_num));
41*4882a593Smuzhiyun return BEFS_BAD_INODE;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun /*
45*4882a593Smuzhiyun * check flag
46*4882a593Smuzhiyun */
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun if (!(flags & BEFS_INODE_IN_USE)) {
49*4882a593Smuzhiyun befs_error(sb, "inode is not used - inode = %lu",
50*4882a593Smuzhiyun (unsigned long)inode);
51*4882a593Smuzhiyun return BEFS_BAD_INODE;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun return BEFS_OK;
55*4882a593Smuzhiyun }
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