original development tree for Linux kernel GTP module; now long in mainline.
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/*
* inode.c
*
* Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
*/
#include <linux/fs.h>
#include "befs.h"
#include "inode.h"
/*
Validates the correctness of the befs inode
Returns BEFS_OK if the inode should be used, otherwise
returns BEFS_BAD_INODE
*/
int
befs_check_inode(struct super_block *sb, befs_inode * raw_inode,
befs_blocknr_t inode)
{
u32 magic1 = fs32_to_cpu(sb, raw_inode->magic1);
befs_inode_addr ino_num = fsrun_to_cpu(sb, raw_inode->inode_num);
u32 flags = fs32_to_cpu(sb, raw_inode->flags);
/* check magic header. */
if (magic1 != BEFS_INODE_MAGIC1) {
befs_error(sb,
"Inode has a bad magic header - inode = %lu", inode);
return BEFS_BAD_INODE;
}
/*
* Sanity check2: inodes store their own block address. Check it.
*/
if (inode != iaddr2blockno(sb, &ino_num)) {
befs_error(sb, "inode blocknr field disagrees with vfs "
"VFS: %lu, Inode %lu",
inode, iaddr2blockno(sb, &ino_num));
return BEFS_BAD_INODE;
}
/*
* check flag
*/
if (!(flags & BEFS_INODE_IN_USE)) {
befs_error(sb, "inode is not used - inode = %lu", inode);
return BEFS_BAD_INODE;
}
return BEFS_OK;
}