[fio.git] / os / os-linux.h

#ifndef FIO_OS_LINUX_H
#define FIO_OS_LINUX_H

#define	FIO_OS	os_linux

#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/syscall.h>
#include <sys/sysmacros.h>
#include <sys/vfs.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sched.h>
#include <linux/unistd.h>
#include <linux/raw.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <scsi/sg.h>

#ifdef ARCH_HAVE_CRC_CRYPTO
#include <sys/auxv.h>
#ifndef HWCAP_CRC32
#define HWCAP_CRC32             (1 << 7)
#endif /* HWCAP_CRC32 */
#endif /* ARCH_HAVE_CRC_CRYPTO */

#include "./os-linux-syscall.h"
#include "../file.h"

#ifndef __has_builtin         // Optional of course.
  #define __has_builtin(x) 0  // Compatibility with non-clang compilers.
#endif

#define FIO_HAVE_CPU_AFFINITY
#define FIO_HAVE_DISK_UTIL
#define FIO_HAVE_SGIO
#define FIO_HAVE_IOPRIO
#define FIO_HAVE_IOPRIO_CLASS
#define FIO_HAVE_IOSCHED_SWITCH
#define FIO_HAVE_ODIRECT
#define FIO_HAVE_HUGETLB
#define FIO_HAVE_RAWBIND
#define FIO_HAVE_BLKTRACE
#define FIO_HAVE_CL_SIZE
#define FIO_HAVE_CGROUPS
#define FIO_HAVE_FS_STAT
#define FIO_HAVE_TRIM
#define FIO_HAVE_GETTID
#define FIO_USE_GENERIC_INIT_RANDOM_STATE
#define FIO_HAVE_PWRITEV2
#define FIO_HAVE_SHM_ATTACH_REMOVED

#ifdef MAP_HUGETLB
#define FIO_HAVE_MMAP_HUGE
#endif

#define OS_MAP_ANON		MAP_ANONYMOUS

#define FIO_EXT_ENG_DIR	"/usr/lib/fio"

typedef cpu_set_t os_cpu_mask_t;

#ifdef CONFIG_3ARG_AFFINITY
#define fio_setaffinity(pid, cpumask)		\
	sched_setaffinity((pid), sizeof(cpumask), &(cpumask))
#define fio_getaffinity(pid, ptr)	\
	sched_getaffinity((pid), sizeof(cpu_set_t), (ptr))
#elif defined(CONFIG_2ARG_AFFINITY)
#define fio_setaffinity(pid, cpumask)	\
	sched_setaffinity((pid), &(cpumask))
#define fio_getaffinity(pid, ptr)	\
	sched_getaffinity((pid), (ptr))
#endif

#define fio_cpu_clear(mask, cpu)	(void) CPU_CLR((cpu), (mask))
#define fio_cpu_set(mask, cpu)		(void) CPU_SET((cpu), (mask))
#define fio_cpu_isset(mask, cpu)	(CPU_ISSET((cpu), (mask)) != 0)
#define fio_cpu_count(mask)		CPU_COUNT((mask))

static inline int fio_cpuset_init(os_cpu_mask_t *mask)
{
	CPU_ZERO(mask);
	return 0;
}

static inline int fio_cpuset_exit(os_cpu_mask_t *mask)
{
	return 0;
}

#define FIO_MAX_CPUS			CPU_SETSIZE

enum {
	IOPRIO_CLASS_NONE,
	IOPRIO_CLASS_RT,
	IOPRIO_CLASS_BE,
	IOPRIO_CLASS_IDLE,
};

enum {
	IOPRIO_WHO_PROCESS = 1,
	IOPRIO_WHO_PGRP,
	IOPRIO_WHO_USER,
};

#define IOPRIO_BITS		16
#define IOPRIO_CLASS_SHIFT	13

#define IOPRIO_MIN_PRIO		0	/* highest priority */
#define IOPRIO_MAX_PRIO		7	/* lowest priority */

#define IOPRIO_MIN_PRIO_CLASS	0
#define IOPRIO_MAX_PRIO_CLASS	3

static inline int ioprio_set(int which, int who, int ioprio_class, int ioprio)
{
	/*
	 * If no class is set, assume BE
	 */
	if (!ioprio_class)
		ioprio_class = IOPRIO_CLASS_BE;

	ioprio |= ioprio_class << IOPRIO_CLASS_SHIFT;
	return syscall(__NR_ioprio_set, which, who, ioprio);
}

#ifndef CONFIG_HAVE_GETTID
static inline int gettid(void)
{
	return syscall(__NR_gettid);
}
#endif

#define SPLICE_DEF_SIZE	(64*1024)

#ifndef BLKGETSIZE64
#define BLKGETSIZE64	_IOR(0x12,114,size_t)
#endif

#ifndef BLKFLSBUF
#define BLKFLSBUF	_IO(0x12,97)
#endif

#ifndef BLKDISCARD
#define BLKDISCARD	_IO(0x12,119)
#endif

static inline int blockdev_invalidate_cache(struct fio_file *f)
{
	return ioctl(f->fd, BLKFLSBUF);
}

static inline int blockdev_size(struct fio_file *f, unsigned long long *bytes)
{
	if (!ioctl(f->fd, BLKGETSIZE64, bytes))
		return 0;

	return errno;
}

static inline unsigned long long os_phys_mem(void)
{
	long pagesize, pages;

	pagesize = sysconf(_SC_PAGESIZE);
	pages = sysconf(_SC_PHYS_PAGES);
	if (pages == -1 || pagesize == -1)
		return 0;

	return (unsigned long long) pages * (unsigned long long) pagesize;
}

static inline int fio_lookup_raw(dev_t dev, int *majdev, int *mindev)
{
	struct raw_config_request rq;
	int fd;

	if (major(dev) != RAW_MAJOR)
		return 1;

	/*
	 * we should be able to find /dev/rawctl or /dev/raw/rawctl
	 */
	fd = open("/dev/rawctl", O_RDONLY);
	if (fd < 0) {
		fd = open("/dev/raw/rawctl", O_RDONLY);
		if (fd < 0)
			return 1;
	}

	rq.raw_minor = minor(dev);
	if (ioctl(fd, RAW_GETBIND, &rq) < 0) {
		close(fd);
		return 1;
	}

	close(fd);
	*majdev = rq.block_major;
	*mindev = rq.block_minor;
	return 0;
}

#ifdef O_NOATIME
#define FIO_O_NOATIME	O_NOATIME
#else
#define FIO_O_NOATIME	0
#endif

#ifdef O_ATOMIC
#define OS_O_ATOMIC	O_ATOMIC
#else
#define OS_O_ATOMIC	040000000
#endif

#ifdef MADV_REMOVE
#define FIO_MADV_FREE	MADV_REMOVE
#endif

/* Check for GCC or Clang byte swap intrinsics */
#if (__has_builtin(__builtin_bswap16) && __has_builtin(__builtin_bswap32) \
     && __has_builtin(__builtin_bswap64)) || (__GNUC__ > 4 \
     || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) /* fio_swapN */
#define fio_swap16(x)	__builtin_bswap16(x)
#define fio_swap32(x)	__builtin_bswap32(x)
#define fio_swap64(x)	__builtin_bswap64(x)
#else
#include <byteswap.h>
#define fio_swap16(x)	bswap_16(x)
#define fio_swap32(x)	bswap_32(x)
#define fio_swap64(x)	bswap_64(x)
#endif /* fio_swapN */

#define CACHE_LINE_FILE	\
	"/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"

static inline int arch_cache_line_size(void)
{
	char size[32];
	int fd, ret;

	fd = open(CACHE_LINE_FILE, O_RDONLY);
	if (fd < 0)
		return -1;

	ret = read(fd, size, sizeof(size));

	close(fd);

	if (ret <= 0)
		return -1;
	else
		return atoi(size);
}

#ifdef __powerpc64__
#define FIO_HAVE_CPU_ONLINE_SYSCONF
static inline unsigned int cpus_online(void)
{
        return sysconf(_SC_NPROCESSORS_CONF);
}
#endif

static inline unsigned long long get_fs_free_size(const char *path)
{
	unsigned long long ret;
	struct statfs s;

	if (statfs(path, &s) < 0)
		return -1ULL;

	ret = s.f_bsize;
	ret *= (unsigned long long) s.f_bfree;
	return ret;
}

static inline int os_trim(struct fio_file *f, unsigned long long start,
			  unsigned long long len)
{
	uint64_t range[2];

	range[0] = start;
	range[1] = len;

	if (!ioctl(f->fd, BLKDISCARD, range))
		return 0;

	return errno;
}

#ifdef CONFIG_SCHED_IDLE
static inline int fio_set_sched_idle(void)
{
	struct sched_param p = { .sched_priority = 0, };
	return sched_setscheduler(gettid(), SCHED_IDLE, &p);
}
#endif

#ifndef F_GET_RW_HINT
#ifndef F_LINUX_SPECIFIC_BASE
#define F_LINUX_SPECIFIC_BASE	1024
#endif
#define F_GET_RW_HINT		(F_LINUX_SPECIFIC_BASE + 11)
#define F_SET_RW_HINT		(F_LINUX_SPECIFIC_BASE + 12)
#define F_GET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 13)
#define F_SET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 14)
#endif

#ifndef RWH_WRITE_LIFE_NONE
#define RWH_WRITE_LIFE_NOT_SET	0
#define RWH_WRITE_LIFE_NONE	1
#define RWH_WRITE_LIFE_SHORT	2
#define RWH_WRITE_LIFE_MEDIUM	3
#define RWH_WRITE_LIFE_LONG	4
#define RWH_WRITE_LIFE_EXTREME	5
#endif

#define FIO_HAVE_WRITE_HINT

#ifndef RWF_HIPRI
#define RWF_HIPRI	0x00000001
#endif
#ifndef RWF_DSYNC
#define RWF_DSYNC	0x00000002
#endif
#ifndef RWF_SYNC
#define RWF_SYNC	0x00000004
#endif
#ifndef RWF_NOWAIT
#define RWF_NOWAIT	0x00000008
#endif

#ifndef RWF_UNCACHED
#define RWF_UNCACHED	0x00000040
#endif

#ifndef RWF_WRITE_LIFE_SHIFT
#define RWF_WRITE_LIFE_SHIFT		4
#define RWF_WRITE_LIFE_SHORT		(1 << RWF_WRITE_LIFE_SHIFT)
#define RWF_WRITE_LIFE_MEDIUM		(2 << RWF_WRITE_LIFE_SHIFT)
#define RWF_WRITE_LIFE_LONG		(3 << RWF_WRITE_LIFE_SHIFT)
#define RWF_WRITE_LIFE_EXTREME		(4 << RWF_WRITE_LIFE_SHIFT)
#endif

#ifndef CONFIG_PWRITEV2
#ifdef __NR_preadv2
static inline void make_pos_h_l(unsigned long *pos_h, unsigned long *pos_l,
				off_t offset)
{
#if BITS_PER_LONG == 64
	*pos_l = offset;
	*pos_h = 0;
#else
	*pos_l = offset & 0xffffffff;
	*pos_h = ((uint64_t) offset) >> 32;
#endif
}
static inline ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt,
			      off_t offset, unsigned int flags)
{
	unsigned long pos_l, pos_h;

	make_pos_h_l(&pos_h, &pos_l, offset);
	return syscall(__NR_preadv2, fd, iov, iovcnt, pos_l, pos_h, flags);
}
static inline ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt,
			       off_t offset, unsigned int flags)
{
	unsigned long pos_l, pos_h;

	make_pos_h_l(&pos_h, &pos_l, offset);
	return syscall(__NR_pwritev2, fd, iov, iovcnt, pos_l, pos_h, flags);
}
#else
static inline ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt,
			      off_t offset, unsigned int flags)
{
	errno = ENOSYS;
	return -1;
}
static inline ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt,
			       off_t offset, unsigned int flags)
{
	errno = ENOSYS;
	return -1;
}
#endif /* __NR_preadv2 */
#endif /* CONFIG_PWRITEV2 */

static inline int shm_attach_to_open_removed(void)
{
	return 1;
}

#ifdef CONFIG_LINUX_FALLOCATE
#define FIO_HAVE_NATIVE_FALLOCATE
static inline bool fio_fallocate(struct fio_file *f, uint64_t offset,
				 uint64_t len)
{
	int ret;
	ret = fallocate(f->fd, 0, offset, len);
	if (ret == 0)
		return true;

	/* Work around buggy old glibc versions... */
	if (ret > 0)
		errno = ret;

	return false;
}
#endif

#define FIO_HAVE_CPU_HAS
static inline bool os_cpu_has(cpu_features feature)
{
	bool have_feature;
	unsigned long fio_unused hwcap;

	switch (feature) {
#ifdef ARCH_HAVE_CRC_CRYPTO
	case CPU_ARM64_CRC32C:
		hwcap = getauxval(AT_HWCAP);
		have_feature = (hwcap & HWCAP_CRC32) != 0;
		break;
#endif
	default:
		have_feature = false;
	}

	return have_feature;
}

#endif
Commit	Line	Data
	1	#ifndef FIO_OS_LINUX_H
	2	#define FIO_OS_LINUX_H
	3
	4	#define FIO_OS os_linux
	5
	6	#include <sys/ioctl.h>
	7	#include <sys/uio.h>
	8	#include <sys/syscall.h>
	9	#include <sys/sysmacros.h>
	10	#include <sys/vfs.h>
	11	#include <sys/mman.h>
	12	#include <unistd.h>
	13	#include <fcntl.h>
	14	#include <errno.h>
	15	#include <sched.h>
	16	#include <linux/unistd.h>
	17	#include <linux/raw.h>
	18	#include <linux/major.h>
	19	#include <linux/fs.h>
	20	#include <scsi/sg.h>
	21
	22	#ifdef ARCH_HAVE_CRC_CRYPTO
	23	#include <sys/auxv.h>
	24	#ifndef HWCAP_CRC32
	25	#define HWCAP_CRC32 (1 << 7)
	26	#endif /* HWCAP_CRC32 */
	27	#endif /* ARCH_HAVE_CRC_CRYPTO */
	28
	29	#include "./os-linux-syscall.h"
	30	#include "../file.h"
	31
	32	#ifndef __has_builtin // Optional of course.
	33	#define __has_builtin(x) 0 // Compatibility with non-clang compilers.
	34	#endif
	35
	36	#define FIO_HAVE_CPU_AFFINITY
	37	#define FIO_HAVE_DISK_UTIL
	38	#define FIO_HAVE_SGIO
	39	#define FIO_HAVE_IOPRIO
	40	#define FIO_HAVE_IOPRIO_CLASS
	41	#define FIO_HAVE_IOSCHED_SWITCH
	42	#define FIO_HAVE_ODIRECT
	43	#define FIO_HAVE_HUGETLB
	44	#define FIO_HAVE_RAWBIND
	45	#define FIO_HAVE_BLKTRACE
	46	#define FIO_HAVE_CL_SIZE
	47	#define FIO_HAVE_CGROUPS
	48	#define FIO_HAVE_FS_STAT
	49	#define FIO_HAVE_TRIM
	50	#define FIO_HAVE_GETTID
	51	#define FIO_USE_GENERIC_INIT_RANDOM_STATE
	52	#define FIO_HAVE_PWRITEV2
	53	#define FIO_HAVE_SHM_ATTACH_REMOVED
	54
	55	#ifdef MAP_HUGETLB
	56	#define FIO_HAVE_MMAP_HUGE
	57	#endif
	58
	59	#define OS_MAP_ANON MAP_ANONYMOUS
	60
	61	#define FIO_EXT_ENG_DIR "/usr/lib/fio"
	62
	63	typedef cpu_set_t os_cpu_mask_t;
	64
	65	#ifdef CONFIG_3ARG_AFFINITY
	66	#define fio_setaffinity(pid, cpumask) \
	67	sched_setaffinity((pid), sizeof(cpumask), &(cpumask))
	68	#define fio_getaffinity(pid, ptr) \
	69	sched_getaffinity((pid), sizeof(cpu_set_t), (ptr))
	70	#elif defined(CONFIG_2ARG_AFFINITY)
	71	#define fio_setaffinity(pid, cpumask) \
	72	sched_setaffinity((pid), &(cpumask))
	73	#define fio_getaffinity(pid, ptr) \
	74	sched_getaffinity((pid), (ptr))
	75	#endif
	76
	77	#define fio_cpu_clear(mask, cpu) (void) CPU_CLR((cpu), (mask))
	78	#define fio_cpu_set(mask, cpu) (void) CPU_SET((cpu), (mask))
	79	#define fio_cpu_isset(mask, cpu) (CPU_ISSET((cpu), (mask)) != 0)
	80	#define fio_cpu_count(mask) CPU_COUNT((mask))
	81
	82	static inline int fio_cpuset_init(os_cpu_mask_t *mask)
	83	{
	84	CPU_ZERO(mask);
	85	return 0;
	86	}
	87
	88	static inline int fio_cpuset_exit(os_cpu_mask_t *mask)
	89	{
	90	return 0;
	91	}
	92
	93	#define FIO_MAX_CPUS CPU_SETSIZE
	94
	95	enum {
	96	IOPRIO_CLASS_NONE,
	97	IOPRIO_CLASS_RT,
	98	IOPRIO_CLASS_BE,
	99	IOPRIO_CLASS_IDLE,
	100	};
	101
	102	enum {
	103	IOPRIO_WHO_PROCESS = 1,
	104	IOPRIO_WHO_PGRP,
	105	IOPRIO_WHO_USER,
	106	};
	107
	108	#define IOPRIO_BITS 16
	109	#define IOPRIO_CLASS_SHIFT 13
	110
	111	#define IOPRIO_MIN_PRIO 0 /* highest priority */
	112	#define IOPRIO_MAX_PRIO 7 /* lowest priority */
	113
	114	#define IOPRIO_MIN_PRIO_CLASS 0
	115	#define IOPRIO_MAX_PRIO_CLASS 3
	116
	117	static inline int ioprio_set(int which, int who, int ioprio_class, int ioprio)
	118	{
	119	/*
	120	* If no class is set, assume BE
	121	*/
	122	if (!ioprio_class)
	123	ioprio_class = IOPRIO_CLASS_BE;
	124
	125	ioprio \|= ioprio_class << IOPRIO_CLASS_SHIFT;
	126	return syscall(__NR_ioprio_set, which, who, ioprio);
	127	}
	128
	129	#ifndef CONFIG_HAVE_GETTID
	130	static inline int gettid(void)
	131	{
	132	return syscall(__NR_gettid);
	133	}
	134	#endif
	135
	136	#define SPLICE_DEF_SIZE (64*1024)
	137
	138	#ifndef BLKGETSIZE64
	139	#define BLKGETSIZE64 _IOR(0x12,114,size_t)
	140	#endif
	141
	142	#ifndef BLKFLSBUF
	143	#define BLKFLSBUF _IO(0x12,97)
	144	#endif
	145
	146	#ifndef BLKDISCARD
	147	#define BLKDISCARD _IO(0x12,119)
	148	#endif
	149
	150	static inline int blockdev_invalidate_cache(struct fio_file *f)
	151	{
	152	return ioctl(f->fd, BLKFLSBUF);
	153	}
	154
	155	static inline int blockdev_size(struct fio_file f, unsigned long long bytes)
	156	{
	157	if (!ioctl(f->fd, BLKGETSIZE64, bytes))
	158	return 0;
	159
	160	return errno;
	161	}
	162
	163	static inline unsigned long long os_phys_mem(void)
	164	{
	165	long pagesize, pages;
	166
	167	pagesize = sysconf(_SC_PAGESIZE);
	168	pages = sysconf(_SC_PHYS_PAGES);
	169	if (pages == -1 \|\| pagesize == -1)
	170	return 0;
	171
	172	return (unsigned long long) pages * (unsigned long long) pagesize;
	173	}
	174
	175	static inline int fio_lookup_raw(dev_t dev, int majdev, int mindev)
	176	{
	177	struct raw_config_request rq;
	178	int fd;
	179
	180	if (major(dev) != RAW_MAJOR)
	181	return 1;
	182
	183	/*
	184	* we should be able to find /dev/rawctl or /dev/raw/rawctl
	185	*/
	186	fd = open("/dev/rawctl", O_RDONLY);
	187	if (fd < 0) {
	188	fd = open("/dev/raw/rawctl", O_RDONLY);
	189	if (fd < 0)
	190	return 1;
	191	}
	192
	193	rq.raw_minor = minor(dev);
	194	if (ioctl(fd, RAW_GETBIND, &rq) < 0) {
	195	close(fd);
	196	return 1;
	197	}
	198
	199	close(fd);
	200	*majdev = rq.block_major;
	201	*mindev = rq.block_minor;
	202	return 0;
	203	}
	204
	205	#ifdef O_NOATIME
	206	#define FIO_O_NOATIME O_NOATIME
	207	#else
	208	#define FIO_O_NOATIME 0
	209	#endif
	210
	211	#ifdef O_ATOMIC
	212	#define OS_O_ATOMIC O_ATOMIC
	213	#else
	214	#define OS_O_ATOMIC 040000000
	215	#endif
	216
	217	#ifdef MADV_REMOVE
	218	#define FIO_MADV_FREE MADV_REMOVE
	219	#endif
	220
	221	/* Check for GCC or Clang byte swap intrinsics */
	222	#if (__has_builtin(__builtin_bswap16) && __has_builtin(__builtin_bswap32) \
	223	&& __has_builtin(__builtin_bswap64)) \|\| (__GNUC__ > 4 \
	224	\|\| (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) /* fio_swapN */
	225	#define fio_swap16(x) __builtin_bswap16(x)
	226	#define fio_swap32(x) __builtin_bswap32(x)
	227	#define fio_swap64(x) __builtin_bswap64(x)
	228	#else
	229	#include <byteswap.h>
	230	#define fio_swap16(x) bswap_16(x)
	231	#define fio_swap32(x) bswap_32(x)
	232	#define fio_swap64(x) bswap_64(x)
	233	#endif /* fio_swapN */
	234
	235	#define CACHE_LINE_FILE \
	236	"/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"
	237
	238	static inline int arch_cache_line_size(void)
	239	{
	240	char size[32];
	241	int fd, ret;
	242
	243	fd = open(CACHE_LINE_FILE, O_RDONLY);
	244	if (fd < 0)
	245	return -1;
	246
	247	ret = read(fd, size, sizeof(size));
	248
	249	close(fd);
	250
	251	if (ret <= 0)
	252	return -1;
	253	else
	254	return atoi(size);
	255	}
	256
	257	#ifdef __powerpc64__
	258	#define FIO_HAVE_CPU_ONLINE_SYSCONF
	259	static inline unsigned int cpus_online(void)
	260	{
	261	return sysconf(_SC_NPROCESSORS_CONF);
	262	}
	263	#endif
	264
	265	static inline unsigned long long get_fs_free_size(const char *path)
	266	{
	267	unsigned long long ret;
	268	struct statfs s;
	269
	270	if (statfs(path, &s) < 0)
	271	return -1ULL;
	272
	273	ret = s.f_bsize;
	274	ret *= (unsigned long long) s.f_bfree;
	275	return ret;
	276	}
	277
	278	static inline int os_trim(struct fio_file *f, unsigned long long start,
	279	unsigned long long len)
	280	{
	281	uint64_t range[2];
	282
	283	range[0] = start;
	284	range[1] = len;
	285
	286	if (!ioctl(f->fd, BLKDISCARD, range))
	287	return 0;
	288
	289	return errno;
	290	}
	291
	292	#ifdef CONFIG_SCHED_IDLE
	293	static inline int fio_set_sched_idle(void)
	294	{
	295	struct sched_param p = { .sched_priority = 0, };
	296	return sched_setscheduler(gettid(), SCHED_IDLE, &p);
	297	}
	298	#endif
	299
	300	#ifndef F_GET_RW_HINT
	301	#ifndef F_LINUX_SPECIFIC_BASE
	302	#define F_LINUX_SPECIFIC_BASE 1024
	303	#endif
	304	#define F_GET_RW_HINT (F_LINUX_SPECIFIC_BASE + 11)
	305	#define F_SET_RW_HINT (F_LINUX_SPECIFIC_BASE + 12)
	306	#define F_GET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 13)
	307	#define F_SET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 14)
	308	#endif
	309
	310	#ifndef RWH_WRITE_LIFE_NONE
	311	#define RWH_WRITE_LIFE_NOT_SET 0
	312	#define RWH_WRITE_LIFE_NONE 1
	313	#define RWH_WRITE_LIFE_SHORT 2
	314	#define RWH_WRITE_LIFE_MEDIUM 3
	315	#define RWH_WRITE_LIFE_LONG 4
	316	#define RWH_WRITE_LIFE_EXTREME 5
	317	#endif
	318
	319	#define FIO_HAVE_WRITE_HINT
	320
	321	#ifndef RWF_HIPRI
	322	#define RWF_HIPRI 0x00000001
	323	#endif
	324	#ifndef RWF_DSYNC
	325	#define RWF_DSYNC 0x00000002
	326	#endif
	327	#ifndef RWF_SYNC
	328	#define RWF_SYNC 0x00000004
	329	#endif
	330	#ifndef RWF_NOWAIT
	331	#define RWF_NOWAIT 0x00000008
	332	#endif
	333
	334	#ifndef RWF_UNCACHED
	335	#define RWF_UNCACHED 0x00000040
	336	#endif
	337
	338	#ifndef RWF_WRITE_LIFE_SHIFT
	339	#define RWF_WRITE_LIFE_SHIFT 4
	340	#define RWF_WRITE_LIFE_SHORT (1 << RWF_WRITE_LIFE_SHIFT)
	341	#define RWF_WRITE_LIFE_MEDIUM (2 << RWF_WRITE_LIFE_SHIFT)
	342	#define RWF_WRITE_LIFE_LONG (3 << RWF_WRITE_LIFE_SHIFT)
	343	#define RWF_WRITE_LIFE_EXTREME (4 << RWF_WRITE_LIFE_SHIFT)
	344	#endif
	345
	346	#ifndef CONFIG_PWRITEV2
	347	#ifdef __NR_preadv2
	348	static inline void make_pos_h_l(unsigned long pos_h, unsigned long pos_l,
	349	off_t offset)
	350	{
	351	#if BITS_PER_LONG == 64
	352	*pos_l = offset;
	353	*pos_h = 0;
	354	#else
	355	*pos_l = offset & 0xffffffff;
	356	*pos_h = ((uint64_t) offset) >> 32;
	357	#endif
	358	}
	359	static inline ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt,
	360	off_t offset, unsigned int flags)
	361	{
	362	unsigned long pos_l, pos_h;
	363
	364	make_pos_h_l(&pos_h, &pos_l, offset);
	365	return syscall(__NR_preadv2, fd, iov, iovcnt, pos_l, pos_h, flags);
	366	}
	367	static inline ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt,
	368	off_t offset, unsigned int flags)
	369	{
	370	unsigned long pos_l, pos_h;
	371
	372	make_pos_h_l(&pos_h, &pos_l, offset);
	373	return syscall(__NR_pwritev2, fd, iov, iovcnt, pos_l, pos_h, flags);
	374	}
	375	#else
	376	static inline ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt,
	377	off_t offset, unsigned int flags)
	378	{
	379	errno = ENOSYS;
	380	return -1;
	381	}
	382	static inline ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt,
	383	off_t offset, unsigned int flags)
	384	{
	385	errno = ENOSYS;
	386	return -1;
	387	}
	388	#endif /* __NR_preadv2 */
	389	#endif /* CONFIG_PWRITEV2 */
	390
	391	static inline int shm_attach_to_open_removed(void)
	392	{
	393	return 1;
	394	}
	395
	396	#ifdef CONFIG_LINUX_FALLOCATE
	397	#define FIO_HAVE_NATIVE_FALLOCATE
	398	static inline bool fio_fallocate(struct fio_file *f, uint64_t offset,
	399	uint64_t len)
	400	{
	401	int ret;
	402	ret = fallocate(f->fd, 0, offset, len);
	403	if (ret == 0)
	404	return true;
	405
	406	/* Work around buggy old glibc versions... */
	407	if (ret > 0)
	408	errno = ret;
	409
	410	return false;
	411	}
	412	#endif
	413
	414	#define FIO_HAVE_CPU_HAS
	415	static inline bool os_cpu_has(cpu_features feature)
	416	{
	417	bool have_feature;
	418	unsigned long fio_unused hwcap;
	419
	420	switch (feature) {
	421	#ifdef ARCH_HAVE_CRC_CRYPTO
	422	case CPU_ARM64_CRC32C:
	423	hwcap = getauxval(AT_HWCAP);
	424	have_feature = (hwcap & HWCAP_CRC32) != 0;
	425	break;
	426	#endif
	427	default:
	428	have_feature = false;
	429	}
	430
	431	return have_feature;
	432	}
	433
	434	#endif