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/*
* compat.h - definitions for compatibility
*/
#ifndef __COMPAT_H__
#define __COMPAT_H__
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif /* HAVE_SYS_IOCTL_H */
#if HAVE_TIME_H
#include <time.h>
#endif /* HAVE_TIME_H */
#include <endian.h>
#include <byteswap.h>
/* GCC related declarations */
#ifdef __GNUC__
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
#endif
#if GCC_VERSION < 29600
#define __builtin_expect(x, e) (x)
#endif
/* Old linux/magic.h may not have the file system magic number of NILFS */
#ifndef NILFS_SUPER_MAGIC
#define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */
#endif
/* Sizes of integral types */
#ifndef U64_MAX
#define U64_MAX 18446744073709551615LL /* __u64 (or u64) max */
#endif
#ifndef S64_MAX
#define S64_MAX 9223372036854775807LL /* __s64 (or s64) max */
#endif
/* Ioctls for freeze and thaw */
#ifndef FIFREEZE
#define FIFREEZE _IOWR('X', 119, int)
#define FITHAW _IOWR('X', 120, int)
#endif
/* Linux specific system clocks */
#ifndef CLOCK_REALTIME_COARSE
#define CLOCK_REALTIME_COARSE 5 /* Supported on Linux 2.6.32 or later */
#endif
#ifndef CLOCK_MONOTONIC_COARSE
#define CLOCK_MONOTONIC_COARSE 6 /* Supported on Linux 2.6.32 or later */
#endif
#ifndef CLOCK_BOOTTIME
#define CLOCK_BOOTTIME 7 /* Supported on Linux 2.6.39 or later */
#endif
/* Operations on timespecs */
#ifndef timespecadd
#define timespecadd(a, b, res) \
do { \
(res)->tv_sec = (a)->tv_sec + (b)->tv_sec; \
(res)->tv_nsec = (a)->tv_nsec + (b)->tv_nsec; \
if ((res)->tv_nsec >= 1000000000L) { \
(res)->tv_sec++; \
(res)->tv_nsec -= 1000000000L; \
} \
} while (0)
#endif
#ifndef timespecsub
#define timespecsub(a, b, res) \
do { \
(res)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(res)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \
if ((res)->tv_nsec < 0) { \
(res)->tv_sec--; \
(res)->tv_nsec += 1000000000L; \
} \
} while (0)
#endif
#ifndef timespecclear
#define timespecclear(ts) \
do { (ts)->tv_sec = 0; (ts)->tv_nsec = 0; } while (0)
#endif
#ifndef timespecisset
#define timespecisset(ts) ((ts)->tv_sec || (ts)->tv_nsec)
#endif
#ifndef timespeccmp
#define timespeccmp(a, b, cmp) \
(((a)->tv_sec == (b)->tv_sec) ? \
((a)->tv_nsec cmp (b)->tv_nsec) : \
((a)->tv_sec cmp (b)->tv_sec))
#endif
/* Byte order */
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define le16_to_cpu(x) ((__u16)(x))
#define le32_to_cpu(x) ((__u32)(x))
#define le64_to_cpu(x) ((__u64)(x))
#define cpu_to_le16(x) ((__u16)(x))
#define cpu_to_le32(x) ((__u32)(x))
#define cpu_to_le64(x) ((__u64)(x))
#define be16_to_cpu(x) bswap_16(x)
#define be32_to_cpu(x) bswap_32(x)
#define be64_to_cpu(x) bswap_64(x)
#define cpu_to_be16(x) bswap_16(x)
#define cpu_to_be32(x) bswap_32(x)
#define cpu_to_be64(x) bswap_64(x)
#elif __BYTE_ORDER == __BIG_ENDIAN
#define le16_to_cpu(x) bswap_16(x)
#define le32_to_cpu(x) bswap_32(x)
#define le64_to_cpu(x) bswap_64(x)
#define cpu_to_le16(x) bswap_16(x)
#define cpu_to_le32(x) bswap_32(x)
#define cpu_to_le64(x) bswap_64(x)
#define be16_to_cpu(x) ((__u16)(x))
#define be32_to_cpu(x) ((__u32)(x))
#define be64_to_cpu(x) ((__u64)(x))
#define cpu_to_be16(x) ((__u16)(x))
#define cpu_to_be32(x) ((__u32)(x))
#define cpu_to_be64(x) ((__u64)(x))
#else
#error "unknown endian"
#endif /* __BYTE_ORDER */
#if HAVE_LIMITS_H
#include <limits.h> /* PATH_MAX */
#endif /* HAVE_LIMITS_H */
#ifndef PATH_MAX
#define PATH_MAX 8192
#endif
#if HAVE_SYS_SYSMACROS_H
#include <sys/sysmacros.h> /* major(), minor() */
#else
#ifndef major
#define major(dev) gnu_dev_major(dev)
#define minor(dev) gnu_dev_minor(dev)
#endif
#endif /* HAVE_SYS_SYSMACROS_H */
#endif /* __COMPAT_H__ */
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