1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _VSTRUCTS_H
3 #define _VSTRUCTS_H
4
5 #include "util.h"
6
7 /*
8 * NOTE: we can't differentiate between __le64 and u64 with type_is - this
9 * assumes u64 is little endian:
10 */
11 #define __vstruct_u64s(_s) \
12 ({ \
13 ( type_is((_s)->u64s, u64) ? le64_to_cpu((__force __le64) (_s)->u64s) \
14 : type_is((_s)->u64s, u32) ? le32_to_cpu((__force __le32) (_s)->u64s) \
15 : type_is((_s)->u64s, u16) ? le16_to_cpu((__force __le16) (_s)->u64s) \
16 : ((__force u8) ((_s)->u64s))); \
17 })
18
19 #define __vstruct_bytes(_type, _u64s) \
20 ({ \
21 BUILD_BUG_ON(offsetof(_type, _data) % sizeof(u64)); \
22 \
23 (size_t) (offsetof(_type, _data) + (_u64s) * sizeof(u64)); \
24 })
25
26 #define vstruct_bytes(_s) \
27 __vstruct_bytes(typeof(*(_s)), __vstruct_u64s(_s))
28
29 #define __vstruct_blocks(_type, _sector_block_bits, _u64s) \
30 (round_up(__vstruct_bytes(_type, _u64s), \
31 512 << (_sector_block_bits)) >> (9 + (_sector_block_bits)))
32
33 #define vstruct_blocks(_s, _sector_block_bits) \
34 __vstruct_blocks(typeof(*(_s)), _sector_block_bits, __vstruct_u64s(_s))
35
36 #define vstruct_blocks_plus(_s, _sector_block_bits, _u64s) \
37 __vstruct_blocks(typeof(*(_s)), _sector_block_bits, \
38 __vstruct_u64s(_s) + (_u64s))
39
40 #define vstruct_sectors(_s, _sector_block_bits) \
41 (round_up(vstruct_bytes(_s), 512 << (_sector_block_bits)) >> 9)
42
43 #define vstruct_next(_s) \
44 ((typeof(_s)) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
45 #define vstruct_last(_s) \
46 ((typeof(&(_s)->start[0])) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
47 #define vstruct_end(_s) \
48 ((void *) ((u64 *) (_s)->_data + __vstruct_u64s(_s)))
49
50 #define vstruct_for_each(_s, _i) \
51 for (typeof(&(_s)->start[0]) _i = (_s)->start; \
52 _i < vstruct_last(_s); \
53 _i = vstruct_next(_i))
54
55 #define vstruct_for_each_safe(_s, _i) \
56 for (typeof(&(_s)->start[0]) _next, _i = (_s)->start; \
57 _i < vstruct_last(_s) && (_next = vstruct_next(_i), true); \
58 _i = _next)
59
60 #define vstruct_idx(_s, _idx) \
61 ((typeof(&(_s)->start[0])) ((_s)->_data + (_idx)))
62
63 #endif /* _VSTRUCTS_H */
64
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.