[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>

#include "./os-linux-syscall.h"
#include "binject.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_BINJECT
#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

typedef cpu_set_t os_cpu_mask_t;

typedef struct drand48_data os_random_state_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))
#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);
}

static inline int gettid(void)
{
	return syscall(__NR_gettid);
}

#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 void os_random_seed(unsigned long seed, os_random_state_t *rs)
{
	srand48_r(seed, rs);
}

static inline long os_random_long(os_random_state_t *rs)
{
	long val;

	lrand48_r(rs, &val);
	return val;
}

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_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, 0, len);
	if (ret == 0)
		return true;

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

	return false;
}
#endif

#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	#include "./os-linux-syscall.h"
	23	#include "binject.h"
	24	#include "../file.h"
	25
	26	#ifndef __has_builtin // Optional of course.
	27	#define __has_builtin(x) 0 // Compatibility with non-clang compilers.
	28	#endif
	29
	30	#define FIO_HAVE_CPU_AFFINITY
	31	#define FIO_HAVE_DISK_UTIL
	32	#define FIO_HAVE_SGIO
	33	#define FIO_HAVE_IOPRIO
	34	#define FIO_HAVE_IOPRIO_CLASS
	35	#define FIO_HAVE_IOSCHED_SWITCH
	36	#define FIO_HAVE_ODIRECT
	37	#define FIO_HAVE_HUGETLB
	38	#define FIO_HAVE_RAWBIND
	39	#define FIO_HAVE_BLKTRACE
	40	#define FIO_HAVE_CL_SIZE
	41	#define FIO_HAVE_CGROUPS
	42	#define FIO_HAVE_FS_STAT
	43	#define FIO_HAVE_TRIM
	44	#define FIO_HAVE_BINJECT
	45	#define FIO_HAVE_GETTID
	46	#define FIO_USE_GENERIC_INIT_RANDOM_STATE
	47	#define FIO_HAVE_PWRITEV2
	48	#define FIO_HAVE_SHM_ATTACH_REMOVED
	49
	50	#ifdef MAP_HUGETLB
	51	#define FIO_HAVE_MMAP_HUGE
	52	#endif
	53
	54	#define OS_MAP_ANON MAP_ANONYMOUS
	55
	56	typedef cpu_set_t os_cpu_mask_t;
	57
	58	typedef struct drand48_data os_random_state_t;
	59
	60	#ifdef CONFIG_3ARG_AFFINITY
	61	#define fio_setaffinity(pid, cpumask) \
	62	sched_setaffinity((pid), sizeof(cpumask), &(cpumask))
	63	#define fio_getaffinity(pid, ptr) \
	64	sched_getaffinity((pid), sizeof(cpu_set_t), (ptr))
	65	#elif defined(CONFIG_2ARG_AFFINITY)
	66	#define fio_setaffinity(pid, cpumask) \
	67	sched_setaffinity((pid), &(cpumask))
	68	#define fio_getaffinity(pid, ptr) \
	69	sched_getaffinity((pid), (ptr))
	70	#endif
	71
	72	#define fio_cpu_clear(mask, cpu) (void) CPU_CLR((cpu), (mask))
	73	#define fio_cpu_set(mask, cpu) (void) CPU_SET((cpu), (mask))
	74	#define fio_cpu_isset(mask, cpu) CPU_ISSET((cpu), (mask))
	75	#define fio_cpu_count(mask) CPU_COUNT((mask))
	76
	77	static inline int fio_cpuset_init(os_cpu_mask_t *mask)
	78	{
	79	CPU_ZERO(mask);
	80	return 0;
	81	}
	82
	83	static inline int fio_cpuset_exit(os_cpu_mask_t *mask)
	84	{
	85	return 0;
	86	}
	87
	88	#define FIO_MAX_CPUS CPU_SETSIZE
	89
	90	enum {
	91	IOPRIO_CLASS_NONE,
	92	IOPRIO_CLASS_RT,
	93	IOPRIO_CLASS_BE,
	94	IOPRIO_CLASS_IDLE,
	95	};
	96
	97	enum {
	98	IOPRIO_WHO_PROCESS = 1,
	99	IOPRIO_WHO_PGRP,
	100	IOPRIO_WHO_USER,
	101	};
	102
	103	#define IOPRIO_BITS 16
	104	#define IOPRIO_CLASS_SHIFT 13
	105
	106	#define IOPRIO_MIN_PRIO 0 /* highest priority */
	107	#define IOPRIO_MAX_PRIO 7 /* lowest priority */
	108
	109	#define IOPRIO_MIN_PRIO_CLASS 0
	110	#define IOPRIO_MAX_PRIO_CLASS 3
	111
	112	static inline int ioprio_set(int which, int who, int ioprio_class, int ioprio)
	113	{
	114	/*
	115	* If no class is set, assume BE
	116	*/
	117	if (!ioprio_class)
	118	ioprio_class = IOPRIO_CLASS_BE;
	119
	120	ioprio \|= ioprio_class << IOPRIO_CLASS_SHIFT;
	121	return syscall(__NR_ioprio_set, which, who, ioprio);
	122	}
	123
	124	static inline int gettid(void)
	125	{
	126	return syscall(__NR_gettid);
	127	}
	128
	129	#define SPLICE_DEF_SIZE (64*1024)
	130
	131	#ifndef BLKGETSIZE64
	132	#define BLKGETSIZE64 _IOR(0x12,114,size_t)
	133	#endif
	134
	135	#ifndef BLKFLSBUF
	136	#define BLKFLSBUF _IO(0x12,97)
	137	#endif
	138
	139	#ifndef BLKDISCARD
	140	#define BLKDISCARD _IO(0x12,119)
	141	#endif
	142
	143	static inline int blockdev_invalidate_cache(struct fio_file *f)
	144	{
	145	return ioctl(f->fd, BLKFLSBUF);
	146	}
	147
	148	static inline int blockdev_size(struct fio_file f, unsigned long long bytes)
	149	{
	150	if (!ioctl(f->fd, BLKGETSIZE64, bytes))
	151	return 0;
	152
	153	return errno;
	154	}
	155
	156	static inline unsigned long long os_phys_mem(void)
	157	{
	158	long pagesize, pages;
	159
	160	pagesize = sysconf(_SC_PAGESIZE);
	161	pages = sysconf(_SC_PHYS_PAGES);
	162	if (pages == -1 \|\| pagesize == -1)
	163	return 0;
	164
	165	return (unsigned long long) pages * (unsigned long long) pagesize;
	166	}
	167
	168	static inline void os_random_seed(unsigned long seed, os_random_state_t *rs)
	169	{
	170	srand48_r(seed, rs);
	171	}
	172
	173	static inline long os_random_long(os_random_state_t *rs)
	174	{
	175	long val;
	176
	177	lrand48_r(rs, &val);
	178	return val;
	179	}
	180
	181	static inline int fio_lookup_raw(dev_t dev, int majdev, int mindev)
	182	{
	183	struct raw_config_request rq;
	184	int fd;
	185
	186	if (major(dev) != RAW_MAJOR)
	187	return 1;
	188
	189	/*
	190	* we should be able to find /dev/rawctl or /dev/raw/rawctl
	191	*/
	192	fd = open("/dev/rawctl", O_RDONLY);
	193	if (fd < 0) {
	194	fd = open("/dev/raw/rawctl", O_RDONLY);
	195	if (fd < 0)
	196	return 1;
	197	}
	198
	199	rq.raw_minor = minor(dev);
	200	if (ioctl(fd, RAW_GETBIND, &rq) < 0) {
	201	close(fd);
	202	return 1;
	203	}
	204
	205	close(fd);
	206	*majdev = rq.block_major;
	207	*mindev = rq.block_minor;
	208	return 0;
	209	}
	210
	211	#ifdef O_NOATIME
	212	#define FIO_O_NOATIME O_NOATIME
	213	#else
	214	#define FIO_O_NOATIME 0
	215	#endif
	216
	217	#ifdef O_ATOMIC
	218	#define OS_O_ATOMIC O_ATOMIC
	219	#else
	220	#define OS_O_ATOMIC 040000000
	221	#endif
	222
	223	#ifdef MADV_REMOVE
	224	#define FIO_MADV_FREE MADV_REMOVE
	225	#endif
	226
	227	/* Check for GCC or Clang byte swap intrinsics */
	228	#if (__has_builtin(__builtin_bswap16) && __has_builtin(__builtin_bswap32) \
	229	&& __has_builtin(__builtin_bswap64)) \|\| (__GNUC__ > 4 \
	230	\|\| (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) /* fio_swapN */
	231	#define fio_swap16(x) __builtin_bswap16(x)
	232	#define fio_swap32(x) __builtin_bswap32(x)
	233	#define fio_swap64(x) __builtin_bswap64(x)
	234	#else
	235	#include <byteswap.h>
	236	#define fio_swap16(x) bswap_16(x)
	237	#define fio_swap32(x) bswap_32(x)
	238	#define fio_swap64(x) bswap_64(x)
	239	#endif /* fio_swapN */
	240
	241	#define CACHE_LINE_FILE \
	242	"/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"
	243
	244	static inline int arch_cache_line_size(void)
	245	{
	246	char size[32];
	247	int fd, ret;
	248
	249	fd = open(CACHE_LINE_FILE, O_RDONLY);
	250	if (fd < 0)
	251	return -1;
	252
	253	ret = read(fd, size, sizeof(size));
	254
	255	close(fd);
	256
	257	if (ret <= 0)
	258	return -1;
	259	else
	260	return atoi(size);
	261	}
	262
	263	#ifdef __powerpc64__
	264	#define FIO_HAVE_CPU_ONLINE_SYSCONF
	265	static inline unsigned int cpus_online(void)
	266	{
	267	return sysconf(_SC_NPROCESSORS_CONF);
	268	}
	269	#endif
	270
	271	static inline unsigned long long get_fs_free_size(const char *path)
	272	{
	273	unsigned long long ret;
	274	struct statfs s;
	275
	276	if (statfs(path, &s) < 0)
	277	return -1ULL;
	278
	279	ret = s.f_bsize;
	280	ret *= (unsigned long long) s.f_bfree;
	281	return ret;
	282	}
	283
	284	static inline int os_trim(struct fio_file *f, unsigned long long start,
	285	unsigned long long len)
	286	{
	287	uint64_t range[2];
	288
	289	range[0] = start;
	290	range[1] = len;
	291
	292	if (!ioctl(f->fd, BLKDISCARD, range))
	293	return 0;
	294
	295	return errno;
	296	}
	297
	298	#ifdef CONFIG_SCHED_IDLE
	299	static inline int fio_set_sched_idle(void)
	300	{
	301	struct sched_param p = { .sched_priority = 0, };
	302	return sched_setscheduler(gettid(), SCHED_IDLE, &p);
	303	}
	304	#endif
	305
	306	#ifndef F_GET_RW_HINT
	307	#ifndef F_LINUX_SPECIFIC_BASE
	308	#define F_LINUX_SPECIFIC_BASE 1024
	309	#endif
	310	#define F_GET_RW_HINT (F_LINUX_SPECIFIC_BASE + 11)
	311	#define F_SET_RW_HINT (F_LINUX_SPECIFIC_BASE + 12)
	312	#define F_GET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 13)
	313	#define F_SET_FILE_RW_HINT (F_LINUX_SPECIFIC_BASE + 14)
	314	#endif
	315
	316	#ifndef RWH_WRITE_LIFE_NONE
	317	#define RWH_WRITE_LIFE_NOT_SET 0
	318	#define RWH_WRITE_LIFE_NONE 1
	319	#define RWH_WRITE_LIFE_SHORT 2
	320	#define RWH_WRITE_LIFE_MEDIUM 3
	321	#define RWH_WRITE_LIFE_LONG 4
	322	#define RWH_WRITE_LIFE_EXTREME 5
	323	#endif
	324
	325	#define FIO_HAVE_WRITE_HINT
	326
	327	#ifndef RWF_HIPRI
	328	#define RWF_HIPRI 0x00000001
	329	#endif
	330	#ifndef RWF_DSYNC
	331	#define RWF_DSYNC 0x00000002
	332	#endif
	333	#ifndef RWF_SYNC
	334	#define RWF_SYNC 0x00000004
	335	#endif
	336
	337	#ifndef RWF_WRITE_LIFE_SHIFT
	338	#define RWF_WRITE_LIFE_SHIFT 4
	339	#define RWF_WRITE_LIFE_SHORT (1 << RWF_WRITE_LIFE_SHIFT)
	340	#define RWF_WRITE_LIFE_MEDIUM (2 << RWF_WRITE_LIFE_SHIFT)
	341	#define RWF_WRITE_LIFE_LONG (3 << RWF_WRITE_LIFE_SHIFT)
	342	#define RWF_WRITE_LIFE_EXTREME (4 << RWF_WRITE_LIFE_SHIFT)
	343	#endif
	344
	345	#ifndef CONFIG_PWRITEV2
	346	#ifdef __NR_preadv2
	347	static inline void make_pos_h_l(unsigned long pos_h, unsigned long pos_l,
	348	off_t offset)
	349	{
	350	#if BITS_PER_LONG == 64
	351	*pos_l = offset;
	352	*pos_h = 0;
	353	#else
	354	*pos_l = offset & 0xffffffff;
	355	*pos_h = ((uint64_t) offset) >> 32;
	356	#endif
	357	}
	358	static inline ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt,
	359	off_t offset, unsigned int flags)
	360	{
	361	unsigned long pos_l, pos_h;
	362
	363	make_pos_h_l(&pos_h, &pos_l, offset);
	364	return syscall(__NR_preadv2, fd, iov, iovcnt, pos_l, pos_h, flags);
	365	}
	366	static inline ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt,
	367	off_t offset, unsigned int flags)
	368	{
	369	unsigned long pos_l, pos_h;
	370
	371	make_pos_h_l(&pos_h, &pos_l, offset);
	372	return syscall(__NR_pwritev2, fd, iov, iovcnt, pos_l, pos_h, flags);
	373	}
	374	#else
	375	static inline ssize_t preadv2(int fd, const struct iovec *iov, int iovcnt,
	376	off_t offset, unsigned int flags)
	377	{
	378	errno = ENOSYS;
	379	return -1;
	380	}
	381	static inline ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt,
	382	off_t offset, unsigned int flags)
	383	{
	384	errno = ENOSYS;
	385	return -1;
	386	}
	387	#endif /* __NR_preadv2 */
	388	#endif /* CONFIG_PWRITEV2 */
	389
	390	static inline int shm_attach_to_open_removed(void)
	391	{
	392	return 1;
	393	}
	394
	395	#ifdef CONFIG_LINUX_FALLOCATE
	396	#define FIO_HAVE_NATIVE_FALLOCATE
	397	static inline bool fio_fallocate(struct fio_file *f, uint64_t offset,
	398	uint64_t len)
	399	{
	400	int ret;
	401	ret = fallocate(f->fd, 0, 0, len);
	402	if (ret == 0)
	403	return true;
	404
	405	/* Work around buggy old glibc versions... */
	406	if (ret > 0)
	407	errno = ret;
	408
	409	return false;
	410	}
	411	#endif
	412
	413	#endif