// SPDX-License-Identifier: GPL-2.0
/*
 * 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",
                           (unsigned long)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", (unsigned long)
                           inode, (unsigned long)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",
                           (unsigned long)inode);
                return BEFS_BAD_INODE;
        }

        return BEFS_OK;
}