cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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inode.c (1267B)

      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 */
     18int
     19befs_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",
     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, &ino_num)) {
     38		befs_error(sb, "inode blocknr field disagrees with vfs "
     39			   "VFS: %lu, Inode %lu", (unsigned long)
     40			   inode, (unsigned long)iaddr2blockno(sb, &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, "inode is not used - inode = %lu",
     50			   (unsigned long)inode);
     51		return BEFS_BAD_INODE;
     52	}
     53
     54	return BEFS_OK;
     55}