1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2020 Bootlin
4  *
5  * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
6  */
7 
8 #ifndef SQFS_UTILS_H
9 #define SQFS_UTILS_H
10 
11 #include <linux/bitops.h>
12 #include <linux/kernel.h>
13 #include <stdbool.h>
14 
15 #define SQFS_FRAGMENT_INDEX_OFFSET(A) ((A) % SQFS_MAX_ENTRIES)
16 #define SQFS_FRAGMENT_INDEX(A) ((A) / SQFS_MAX_ENTRIES)
17 #define SQFS_BLOCK_SIZE(A) ((A) & GENMASK(23, 0))
18 #define SQFS_CHECK_FLAG(flag, bit) (((flag) >> (bit)) & 1)
19 /* Useful for both fragment and data blocks */
20 #define SQFS_COMPRESSED_BLOCK(A) (!((A) & BIT(24)))
21 /* SQFS_COMPRESSED_DATA strictly used with super block's 'flags' member */
22 #define SQFS_COMPRESSED_DATA(A) (!((A) & 0x0002))
23 #define SQFS_IS_FRAGMENTED(A) ((A) != 0xFFFFFFFF)
24 /*
25  * These two macros work as getters for a metada block header, retrieving the
26  * data size and if it is compressed/uncompressed
27  */
28 #define SQFS_COMPRESSED_METADATA(A) (!((A) & BIT(15)))
29 #define SQFS_METADATA_SIZE(A) ((A) & GENMASK(14, 0))
30 
31 struct squashfs_super_block_flags {
32 	/* check: unused
33 	 * uncompressed_ids: not supported
34 	 */
35 	bool uncompressed_inodes;
36 	bool uncompressed_data;
37 	bool check;
38 	bool uncompressed_frags;
39 	bool no_frags;
40 	bool always_frags;
41 	bool duplicates;
42 	bool exportable;
43 	bool uncompressed_xattrs;
44 	bool no_xattrs;
45 	bool compressor_options;
46 	bool uncompressed_ids;
47 };
48 
49 #endif /* SQFS_UTILS_H  */
50