| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright (C) 2018 HUAWEI, Inc. |
| * http://www.huawei.com/ |
| * Created by Li Guifu <bluce.liguifu@huawei.com> |
| * Modified by Gao Xiang <gaoxiang25@huawei.com> |
| */ |
| #ifndef __EROFS_DEFS_H |
| #define __EROFS_DEFS_H |
| |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <assert.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <stdbool.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #ifdef HAVE_LINUX_TYPES_H |
| #include <linux/types.h> |
| #endif |
| |
| /* |
| * container_of - cast a member of a structure out to the containing structure |
| * @ptr: the pointer to the member. |
| * @type: the type of the container struct this is embedded in. |
| * @member: the name of the member within the struct. |
| */ |
| #define container_of(ptr, type, member) ({ \ |
| const typeof(((type *)0)->member) *__mptr = (ptr); \ |
| (type *)((char *)__mptr - offsetof(type, member)); }) |
| |
| typedef uint8_t u8; |
| typedef uint16_t u16; |
| typedef uint32_t u32; |
| typedef uint64_t u64; |
| |
| #ifndef HAVE_LINUX_TYPES_H |
| typedef u8 __u8; |
| typedef u16 __u16; |
| typedef u32 __u32; |
| typedef u64 __u64; |
| typedef u16 __le16; |
| typedef u32 __le32; |
| typedef u64 __le64; |
| typedef u16 __be16; |
| typedef u32 __be32; |
| typedef u64 __be64; |
| #endif |
| |
| typedef int8_t s8; |
| typedef int16_t s16; |
| typedef int32_t s32; |
| typedef int64_t s64; |
| |
| |
| #if __BYTE_ORDER == __LITTLE_ENDIAN |
| /* |
| * The host byte order is the same as network byte order, |
| * so these functions are all just identity. |
| */ |
| #define cpu_to_le16(x) ((__u16)(x)) |
| #define cpu_to_le32(x) ((__u32)(x)) |
| #define cpu_to_le64(x) ((__u64)(x)) |
| #define le16_to_cpu(x) ((__u16)(x)) |
| #define le32_to_cpu(x) ((__u32)(x)) |
| #define le64_to_cpu(x) ((__u64)(x)) |
| |
| #else |
| #if __BYTE_ORDER == __BIG_ENDIAN |
| #define cpu_to_le16(x) (__builtin_bswap16(x)) |
| #define cpu_to_le32(x) (__builtin_bswap32(x)) |
| #define cpu_to_le64(x) (__builtin_bswap64(x)) |
| #define le16_to_cpu(x) (__builtin_bswap16(x)) |
| #define le32_to_cpu(x) (__builtin_bswap32(x)) |
| #define le64_to_cpu(x) (__builtin_bswap64(x)) |
| #else |
| #pragma error |
| #endif |
| #endif |
| |
| #ifdef __cplusplus |
| #define BUILD_BUG_ON(condition) static_assert(!(condition)) |
| #elif !defined(__OPTIMIZE__) |
| #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2 * !!(condition)])) |
| #else |
| #define BUILD_BUG_ON(condition) assert(!(condition)) |
| #endif |
| |
| #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) |
| |
| #define __round_mask(x, y) ((__typeof__(x))((y)-1)) |
| #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) |
| #define round_down(x, y) ((x) & ~__round_mask(x, y)) |
| |
| #ifndef roundup |
| /* The `const' in roundup() prevents gcc-3.3 from calling __divdi3 */ |
| #define roundup(x, y) ( \ |
| { \ |
| const typeof(y) __y = y; \ |
| (((x) + (__y - 1)) / __y) * __y; \ |
| } \ |
| ) |
| #endif |
| #define rounddown(x, y) ( \ |
| { \ |
| typeof(x) __x = (x); \ |
| __x - (__x % (y)); \ |
| } \ |
| ) |
| |
| /* Can easily conflict with C++'s std::min */ |
| #ifndef __cplusplus |
| #define min(x, y) ({ \ |
| typeof(x) _min1 = (x); \ |
| typeof(y) _min2 = (y); \ |
| (void) (&_min1 == &_min2); \ |
| _min1 < _min2 ? _min1 : _min2; }) |
| |
| #define max(x, y) ({ \ |
| typeof(x) _max1 = (x); \ |
| typeof(y) _max2 = (y); \ |
| (void) (&_max1 == &_max2); \ |
| _max1 > _max2 ? _max1 : _max2; }) |
| #endif |
| |
| /* |
| * ..and if you can't take the strict types, you can specify one yourself. |
| * Or don't use min/max at all, of course. |
| */ |
| #define min_t(type, x, y) ({ \ |
| type __min1 = (x); \ |
| type __min2 = (y); \ |
| __min1 < __min2 ? __min1: __min2; }) |
| |
| #define max_t(type, x, y) ({ \ |
| type __max1 = (x); \ |
| type __max2 = (y); \ |
| __max1 > __max2 ? __max1: __max2; }) |
| |
| #define cmpsgn(x, y) ({ \ |
| typeof(x) _x = (x); \ |
| typeof(y) _y = (y); \ |
| (_x > _y) - (_x < _y); }) |
| |
| #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) |
| |
| #define BIT(nr) (1UL << (nr)) |
| #define BIT_ULL(nr) (1ULL << (nr)) |
| #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
| #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
| #define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG)) |
| #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
| #define BITS_PER_BYTE 8 |
| #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
| |
| #ifdef __SIZEOF_LONG__ |
| #define BITS_PER_LONG (__CHAR_BIT__ * __SIZEOF_LONG__) |
| #else |
| #define BITS_PER_LONG __WORDSIZE |
| #endif |
| |
| #define BUG_ON(cond) assert(!(cond)) |
| |
| #ifdef NDEBUG |
| #define DBG_BUGON(condition) ((void)(condition)) |
| #else |
| #define DBG_BUGON(condition) BUG_ON(condition) |
| #endif |
| |
| #ifndef __maybe_unused |
| #define __maybe_unused __attribute__((__unused__)) |
| #endif |
| |
| static inline u32 get_unaligned_le32(const u8 *p) |
| { |
| return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; |
| } |
| |
| /** |
| * ilog2 - log of base 2 of 32-bit or a 64-bit unsigned value |
| * @n - parameter |
| * |
| * constant-capable log of base 2 calculation |
| * - this can be used to initialise global variables from constant data, hence |
| * the massive ternary operator construction |
| * |
| * selects the appropriately-sized optimised version depending on sizeof(n) |
| */ |
| #define ilog2(n) \ |
| ( \ |
| (n) & (1ULL << 63) ? 63 : \ |
| (n) & (1ULL << 62) ? 62 : \ |
| (n) & (1ULL << 61) ? 61 : \ |
| (n) & (1ULL << 60) ? 60 : \ |
| (n) & (1ULL << 59) ? 59 : \ |
| (n) & (1ULL << 58) ? 58 : \ |
| (n) & (1ULL << 57) ? 57 : \ |
| (n) & (1ULL << 56) ? 56 : \ |
| (n) & (1ULL << 55) ? 55 : \ |
| (n) & (1ULL << 54) ? 54 : \ |
| (n) & (1ULL << 53) ? 53 : \ |
| (n) & (1ULL << 52) ? 52 : \ |
| (n) & (1ULL << 51) ? 51 : \ |
| (n) & (1ULL << 50) ? 50 : \ |
| (n) & (1ULL << 49) ? 49 : \ |
| (n) & (1ULL << 48) ? 48 : \ |
| (n) & (1ULL << 47) ? 47 : \ |
| (n) & (1ULL << 46) ? 46 : \ |
| (n) & (1ULL << 45) ? 45 : \ |
| (n) & (1ULL << 44) ? 44 : \ |
| (n) & (1ULL << 43) ? 43 : \ |
| (n) & (1ULL << 42) ? 42 : \ |
| (n) & (1ULL << 41) ? 41 : \ |
| (n) & (1ULL << 40) ? 40 : \ |
| (n) & (1ULL << 39) ? 39 : \ |
| (n) & (1ULL << 38) ? 38 : \ |
| (n) & (1ULL << 37) ? 37 : \ |
| (n) & (1ULL << 36) ? 36 : \ |
| (n) & (1ULL << 35) ? 35 : \ |
| (n) & (1ULL << 34) ? 34 : \ |
| (n) & (1ULL << 33) ? 33 : \ |
| (n) & (1ULL << 32) ? 32 : \ |
| (n) & (1ULL << 31) ? 31 : \ |
| (n) & (1ULL << 30) ? 30 : \ |
| (n) & (1ULL << 29) ? 29 : \ |
| (n) & (1ULL << 28) ? 28 : \ |
| (n) & (1ULL << 27) ? 27 : \ |
| (n) & (1ULL << 26) ? 26 : \ |
| (n) & (1ULL << 25) ? 25 : \ |
| (n) & (1ULL << 24) ? 24 : \ |
| (n) & (1ULL << 23) ? 23 : \ |
| (n) & (1ULL << 22) ? 22 : \ |
| (n) & (1ULL << 21) ? 21 : \ |
| (n) & (1ULL << 20) ? 20 : \ |
| (n) & (1ULL << 19) ? 19 : \ |
| (n) & (1ULL << 18) ? 18 : \ |
| (n) & (1ULL << 17) ? 17 : \ |
| (n) & (1ULL << 16) ? 16 : \ |
| (n) & (1ULL << 15) ? 15 : \ |
| (n) & (1ULL << 14) ? 14 : \ |
| (n) & (1ULL << 13) ? 13 : \ |
| (n) & (1ULL << 12) ? 12 : \ |
| (n) & (1ULL << 11) ? 11 : \ |
| (n) & (1ULL << 10) ? 10 : \ |
| (n) & (1ULL << 9) ? 9 : \ |
| (n) & (1ULL << 8) ? 8 : \ |
| (n) & (1ULL << 7) ? 7 : \ |
| (n) & (1ULL << 6) ? 6 : \ |
| (n) & (1ULL << 5) ? 5 : \ |
| (n) & (1ULL << 4) ? 4 : \ |
| (n) & (1ULL << 3) ? 3 : \ |
| (n) & (1ULL << 2) ? 2 : \ |
| (n) & (1ULL << 1) ? 1 : 0 \ |
| ) |
| |
| static inline unsigned int fls_long(unsigned long x) |
| { |
| return x ? sizeof(x) * 8 - __builtin_clz(x) : 0; |
| } |
| |
| /** |
| * __roundup_pow_of_two() - round up to nearest power of two |
| * @n: value to round up |
| */ |
| static inline __attribute__((const)) |
| unsigned long __roundup_pow_of_two(unsigned long n) |
| { |
| return 1UL << fls_long(n - 1); |
| } |
| |
| /** |
| * roundup_pow_of_two - round the given value up to nearest power of two |
| * @n: parameter |
| * |
| * round the given value up to the nearest power of two |
| * - the result is undefined when n == 0 |
| * - this can be used to initialise global variables from constant data |
| */ |
| #define roundup_pow_of_two(n) \ |
| ( \ |
| __builtin_constant_p(n) ? ( \ |
| ((n) == 1) ? 1 : \ |
| (1UL << (ilog2((n) - 1) + 1)) \ |
| ) : \ |
| __roundup_pow_of_two(n) \ |
| ) |
| |
| #ifndef __always_inline |
| #define __always_inline inline |
| #endif |
| |
| #ifdef HAVE_STRUCT_STAT_ST_ATIM |
| /* Linux */ |
| #define ST_ATIM_NSEC(stbuf) ((stbuf)->st_atim.tv_nsec) |
| #define ST_CTIM_NSEC(stbuf) ((stbuf)->st_ctim.tv_nsec) |
| #define ST_MTIM_NSEC(stbuf) ((stbuf)->st_mtim.tv_nsec) |
| #elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC) |
| /* macOS */ |
| #define ST_ATIM_NSEC(stbuf) ((stbuf)->st_atimensec) |
| #define ST_CTIM_NSEC(stbuf) ((stbuf)->st_ctimensec) |
| #define ST_MTIM_NSEC(stbuf) ((stbuf)->st_mtimensec) |
| #else |
| #define ST_ATIM_NSEC(stbuf) 0 |
| #define ST_CTIM_NSEC(stbuf) 0 |
| #define ST_MTIM_NSEC(stbuf) 0 |
| #endif |
| |
| #ifdef __APPLE__ |
| #define stat64 stat |
| #define lstat64 lstat |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |