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btrfs-progs/kerncompat.h
David Sterba 2b603d9819 btrfs-progs: kernel-lib: add simplified READ_ONCE and WRITE_ONCE 
For easier source synchronization with kernel, add the _ONCE wrappers,
but only the simplified version as we don't do any lock-less
algorithms or use the semantics in userspace.

Signed-off-by: David Sterba <dsterba@suse.com>
2022-05-12 12:43:27 +02:00

567 lines
14 KiB
C
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/*
* Copyright (C) 2007 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __KERNCOMPAT_H__
#define __KERNCOMPAT_H__
#ifndef __SANE_USERSPACE_TYPES__
/* For PPC64 to get LL64 types */
#define __SANE_USERSPACE_TYPES__
#endif
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <endian.h>
#include <byteswap.h>
#include <assert.h>
#include <stddef.h>
#include <linux/types.h>
#include <linux/const.h>
#include <stdint.h>
#include <features.h>
/*
* Glibc supports backtrace, some other libc implementations don't but need to
* be more careful detecting proper glibc.
*/
#if !defined(__GLIBC__) || defined(__UCLIBC__)
#ifndef BTRFS_DISABLE_BACKTRACE
#define BTRFS_DISABLE_BACKTRACE
#endif
#ifndef __always_inline
#define __always_inline __inline __attribute__ ((__always_inline__))
#endif
#endif
#ifndef BTRFS_DISABLE_BACKTRACE
#include <execinfo.h>
#endif
#define ptr_to_u64(x) ((u64)(uintptr_t)x)
#define u64_to_ptr(x) ((void *)(uintptr_t)x)
#ifndef READ
#define READ 0
#define WRITE 1
#define READA 2
#endif
#define gfp_t int
#define get_cpu_var(p) (p)
#define __get_cpu_var(p) (p)
#define BITS_PER_BYTE 8
#define BITS_PER_LONG (__SIZEOF_LONG__ * BITS_PER_BYTE)
#define __GFP_BITS_SHIFT 20
#define __GFP_BITS_MASK ((int)((1 << __GFP_BITS_SHIFT) - 1))
#define GFP_KERNEL 0
#define GFP_NOFS 0
#define __read_mostly
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#ifndef ULONG_MAX
#define ULONG_MAX (~0UL)
#endif
#ifndef SECTOR_SHIFT
#define SECTOR_SHIFT (9)
#endif
#define __token_glue(a,b,c) ___token_glue(a,b,c)
#define ___token_glue(a,b,c) a ## b ## c
#ifdef DEBUG_BUILD_CHECKS
#define BUILD_ASSERT(x) extern int __token_glue(compile_time_assert_,__LINE__,__COUNTER__)[1-2*!(x)] __attribute__((unused))
#else
#define BUILD_ASSERT(x)
#endif
#ifndef BTRFS_DISABLE_BACKTRACE
#define MAX_BACKTRACE 16
static inline void print_trace(void)
{
void *array[MAX_BACKTRACE];
int size;
size = backtrace(array, MAX_BACKTRACE);
backtrace_symbols_fd(array, size, 2);
}
#endif
static inline void warning_trace(const char *assertion, const char *filename,
const char *func, unsigned line, long val)
{
if (!val)
return;
fprintf(stderr,
"%s:%u: %s: Warning: assertion `%s` failed, value %ld\n",
filename, line, func, assertion, val);
#ifndef BTRFS_DISABLE_BACKTRACE
print_trace();
#endif
}
static inline void bugon_trace(const char *assertion, const char *filename,
const char *func, unsigned line, long val)
{
if (!val)
return;
fprintf(stderr,
"%s:%u: %s: BUG_ON `%s` triggered, value %ld\n",
filename, line, func, assertion, val);
#ifndef BTRFS_DISABLE_BACKTRACE
print_trace();
#endif
abort();
exit(1);
}
#ifdef __CHECKER__
#define __force __attribute__((force))
#define __bitwise__ __attribute__((bitwise))
#else
#define __force
#define __bitwise__
#endif
#ifndef __CHECKER__
/*
* Since we're using primitive definitions from kernel-space, we need to
* define __KERNEL__ so that system header files know which definitions
* to use.
*/
#define __KERNEL__
#include <asm/types.h>
typedef __u32 u32;
typedef __u64 u64;
typedef __u16 u16;
typedef __u8 u8;
typedef __s64 s64;
typedef __s32 s32;
/*
* Continuing to define __KERNEL__ breaks others parts of the code, so
* we can just undefine it now that we have the correct headers...
*/
#undef __KERNEL__
#else
typedef unsigned int u32;
typedef unsigned int __u32;
typedef unsigned long long u64;
typedef unsigned char u8;
typedef unsigned short u16;
typedef long long s64;
typedef int s32;
#endif
typedef u64 sector_t;
struct vma_shared { int prio_tree_node; };
struct vm_area_struct {
unsigned long vm_pgoff;
unsigned long vm_start;
unsigned long vm_end;
struct vma_shared shared;
};
struct page {
unsigned long index;
};
struct mutex {
unsigned long lock;
};
#define mutex_init(m) \
do { \
(m)->lock = 1; \
} while (0)
static inline void mutex_lock(struct mutex *m)
{
m->lock--;
}
static inline void mutex_unlock(struct mutex *m)
{
m->lock++;
}
static inline int mutex_is_locked(struct mutex *m)
{
return (m->lock != 1);
}
#define cond_resched() do { } while (0)
#define preempt_enable() do { } while (0)
#define preempt_disable() do { } while (0)
#define BITOP_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
#ifndef __attribute_const__
#define __attribute_const__ __attribute__((__const__))
#endif
/**
* __set_bit - Set a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*
* Unlike set_bit(), this function is non-atomic and may be reordered.
* If it's called on the same region of memory simultaneously, the effect
* may be that only one operation succeeds.
*/
static inline void __set_bit(int nr, volatile unsigned long *addr)
{
unsigned long mask = BITOP_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
*p |= mask;
}
static inline void __clear_bit(int nr, volatile unsigned long *addr)
{
unsigned long mask = BITOP_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
*p &= ~mask;
}
/**
* test_bit - Determine whether a bit is set
* @nr: bit number to test
* @addr: Address to start counting from
*/
static inline int test_bit(int nr, const volatile unsigned long *addr)
{
return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
}
/*
* error pointer
*/
#define MAX_ERRNO 4095
#define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
static inline void *ERR_PTR(long error)
{
return (void *) error;
}
static inline long PTR_ERR(const void *ptr)
{
return (long) ptr;
}
static inline int IS_ERR(const void *ptr)
{
return IS_ERR_VALUE((unsigned long)ptr);
}
static inline int IS_ERR_OR_NULL(const void *ptr)
{
return !ptr || IS_ERR(ptr);
}
#define div_u64(x, y) ((x) / (y))
/**
* __swap - swap values of @a and @b
* @a: first value
* @b: second value
*/
#define __swap(a, b) \
do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
/*
* This looks more complex than it should be. But we need to
* get the type for the ~ right in round_down (it needs to be
* as wide as the result!), and we want to evaluate the macro
* arguments just once each.
*/
#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))
/*
* printk
*/
#define printk(fmt, args...) fprintf(stderr, fmt, ##args)
#define KERN_CRIT ""
#define KERN_ERR ""
/*
* kmalloc/kfree
*/
#define kmalloc(x, y) malloc(x)
#define kzalloc(x, y) calloc(1, x)
#define kstrdup(x, y) strdup(x)
#define kfree(x) free(x)
#define vmalloc(x) malloc(x)
#define vfree(x) free(x)
#define kvzalloc(x, y) kzalloc(x,y)
#define kvfree(x) free(x)
#define memalloc_nofs_save() (0)
#define memalloc_nofs_restore(x) ((void)(x))
#ifndef BTRFS_DISABLE_BACKTRACE
static inline void assert_trace(const char *assertion, const char *filename,
const char *func, unsigned line, long val)
{
if (val)
return;
fprintf(stderr,
"%s:%d: %s: Assertion `%s` failed, value %ld\n",
filename, line, func, assertion, val);
#ifndef BTRFS_DISABLE_BACKTRACE
print_trace();
#endif
abort();
exit(1);
}
#define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
#else
#define ASSERT(c) assert(c)
#endif
#define BUG_ON(c) bugon_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
#define BUG() \
do { \
BUG_ON(1); \
__builtin_unreachable(); \
} while (0)
#define WARN_ON(c) warning_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#ifndef __bitwise
#ifdef __CHECKER__
#define __bitwise __bitwise__
#else
#define __bitwise
#endif /* __CHECKER__ */
#endif /* __bitwise */
/* Alignment check */
#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
/*
* Alignment, copied and renamed from /usr/include/linux/const.h to work around
* issues caused by moving the definition in 5.12
*/
#define __ALIGN_KERNEL__(x, a) __ALIGN_KERNEL_MASK__(x, (typeof(x))(a) - 1)
#define __ALIGN_KERNEL_MASK__(x, mask) (((x) + (mask)) & ~(mask))
#define ALIGN(x, a) __ALIGN_KERNEL__((x), (a))
static inline int is_power_of_2(unsigned long n)
{
return (n != 0 && ((n & (n - 1)) == 0));
}
/**
* const_ilog2 - log base 2 of 32-bit or a 64-bit constant unsigned value
* @n: parameter
*
* Use this where sparse expects a true constant expression, e.g. for array
* indices.
*/
#define const_ilog2(n) \
( \
__builtin_constant_p(n) ? ( \
(n) < 2 ? 0 : \
(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 : \
1) : \
-1)
static inline int ilog2(u64 num)
{
int l = 0;
num >>= 1;
while (num) {
l++;
num >>= 1;
}
return l;
}
typedef u16 __bitwise __le16;
typedef u16 __bitwise __be16;
typedef u32 __bitwise __le32;
typedef u32 __bitwise __be32;
typedef u64 __bitwise __le64;
typedef u64 __bitwise __be64;
#define U64_MAX UINT64_MAX
#define U32_MAX UINT32_MAX
/* Macros to generate set/get funcs for the struct fields
* assume there is a lefoo_to_cpu for every type, so lets make a simple
* one for u8:
*/
#define le8_to_cpu(v) (v)
#define cpu_to_le8(v) (v)
#define __le8 u8
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le64(x) ((__force __le64)(u64)(bswap_64(x)))
#define le64_to_cpu(x) ((__force u64)(__le64)(bswap_64(x)))
#define cpu_to_le32(x) ((__force __le32)(u32)(bswap_32(x)))
#define le32_to_cpu(x) ((__force u32)(__le32)(bswap_32(x)))
#define cpu_to_le16(x) ((__force __le16)(u16)(bswap_16(x)))
#define le16_to_cpu(x) ((__force u16)(__le16)(bswap_16(x)))
#else
#define cpu_to_le64(x) ((__force __le64)(u64)(x))
#define le64_to_cpu(x) ((__force u64)(__le64)(x))
#define cpu_to_le32(x) ((__force __le32)(u32)(x))
#define le32_to_cpu(x) ((__force u32)(__le32)(x))
#define cpu_to_le16(x) ((__force __le16)(u16)(x))
#define le16_to_cpu(x) ((__force u16)(__le16)(x))
#endif
struct __una_u16 { __le16 x; } __attribute__((__packed__));
struct __una_u32 { __le32 x; } __attribute__((__packed__));
struct __una_u64 { __le64 x; } __attribute__((__packed__));
#define get_unaligned_le8(p) (*((u8 *)(p)))
#define get_unaligned_8(p) (*((u8 *)(p)))
#define put_unaligned_le8(val,p) ((*((u8 *)(p))) = (val))
#define put_unaligned_8(val,p) ((*((u8 *)(p))) = (val))
#define get_unaligned_le16(p) le16_to_cpu(((const struct __una_u16 *)(p))->x)
#define get_unaligned_16(p) (((const struct __una_u16 *)(p))->x)
#define put_unaligned_le16(val,p) (((struct __una_u16 *)(p))->x = cpu_to_le16(val))
#define put_unaligned_16(val,p) (((struct __una_u16 *)(p))->x = (val))
#define get_unaligned_le32(p) le32_to_cpu(((const struct __una_u32 *)(p))->x)
#define get_unaligned_32(p) (((const struct __una_u32 *)(p))->x)
#define put_unaligned_le32(val,p) (((struct __una_u32 *)(p))->x = cpu_to_le32(val))
#define put_unaligned_32(val,p) (((struct __una_u32 *)(p))->x = (val))
#define get_unaligned_le64(p) le64_to_cpu(((const struct __una_u64 *)(p))->x)
#define get_unaligned_64(p) (((const struct __una_u64 *)(p))->x)
#define put_unaligned_le64(val,p) (((struct __una_u64 *)(p))->x = cpu_to_le64(val))
#define put_unaligned_64(val,p) (((struct __una_u64 *)(p))->x = (val))
#ifndef true
#define true 1
#define false 0
#endif
#ifndef noinline
#define noinline
#endif
/*
* Note: simplified versions of READ_ONCE and WRITE_ONCE for source
* compatibility only, not usable for lock-less implementation like in kernel.
*
* Changed:
* - __unqual_scalar_typeof: volatile cast to typeof()
* - compiletime_assert_rwonce_type: no word size compatibility checks
*/
/*
* Use __READ_ONCE() instead of READ_ONCE() if you do not require any
* atomicity. Note that this may result in tears!
*/
#ifndef __READ_ONCE
#define __READ_ONCE(x) (*(const volatile typeof(x) *)&(x))
#endif
#define READ_ONCE(x) \
({ \
__READ_ONCE(x); \
})
#define __WRITE_ONCE(x, val) \
do { \
*(volatile typeof(x) *)&(x) = (val); \
} while (0)
#define WRITE_ONCE(x, val) \
do { \
__WRITE_ONCE(x, val); \
} while (0)
#endif
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