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, 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 } 56