GNU Linux-libre 6.9-gnu
[releases.git] / fs / bcachefs / vstructs.h
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 */