[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/vfs.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 <endian.h>

#include "indirect.h"
#include "binject.h"
#include "../file.h"

#define FIO_HAVE_LIBAIO
#define FIO_HAVE_POSIXAIO
#define FIO_HAVE_FADVISE
#define FIO_HAVE_CPU_AFFINITY
#define FIO_HAVE_DISK_UTIL
#define FIO_HAVE_SGIO
#define FIO_HAVE_IOPRIO
#define FIO_HAVE_SPLICE
#define FIO_HAVE_IOSCHED_SWITCH
#define FIO_HAVE_ODIRECT
#define FIO_HAVE_HUGETLB
#define FIO_HAVE_RAWBIND
#define FIO_HAVE_BLKTRACE
#define FIO_HAVE_STRSEP
#define FIO_HAVE_POSIXAIO_FSYNC
#define FIO_HAVE_PSHARED_MUTEX
#define FIO_HAVE_CL_SIZE
#define FIO_HAVE_CGROUPS
#define FIO_HAVE_FDATASYNC
#define FIO_HAVE_FS_STAT
#define FIO_HAVE_TRIM
#define FIO_HAVE_BINJECT
#define FIO_HAVE_CLOCK_MONOTONIC
#define FIO_HAVE_GETTID
#define FIO_USE_GENERIC_INIT_RANDOM_STATE

/*
 * Can only enable this for newer glibcs, or the header and defines are
 * missing
 */
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 6
#define FIO_HAVE_FALLOCATE
#endif
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 8
#define FIO_HAVE_LINUX_FALLOCATE
#endif

#ifdef SYNC_FILE_RANGE_WAIT_BEFORE
#define FIO_HAVE_SYNC_FILE_RANGE
#endif

#define OS_MAP_ANON		MAP_ANONYMOUS

#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC 1
#endif

typedef cpu_set_t os_cpu_mask_t;

typedef struct drand48_data os_random_state_t;

/*
 * we want fadvise64 really, but it's so tangled... later
 */
#ifdef FIO_HAVE_FADVISE
#define fadvise(fd, off, len, advice)	\
	posix_fadvise((fd), (off_t)(off), (len), (advice))
#endif

/*
 * If you are on an ancient glibc (2.3.2), then define GLIBC_2_3_2 if you want
 * the affinity helpers to work.
 */
#ifndef GLIBC_2_3_2
#define fio_setaffinity(pid, cpumask)		\
	sched_setaffinity((pid), sizeof(cpumask), &(cpumask))
#define fio_getaffinity(pid, ptr)	\
	sched_getaffinity((pid), sizeof(cpu_set_t), (ptr))
#else
#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))

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

static inline int ioprio_set(int which, int who, int ioprio)
{
	return syscall(__NR_ioprio_set, which, who, ioprio);
}

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

/*
 * Just check for SPLICE_F_MOVE, if that isn't there, assume the others
 * aren't either.
 */
#ifndef SPLICE_F_MOVE
#define SPLICE_F_MOVE	(0x01)	/* move pages instead of copying */
#define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
				 /* we may still block on the fd we splice */
				 /* from/to, of course */
#define SPLICE_F_MORE	(0x04)	/* expect more data */
#define SPLICE_F_GIFT   (0x08)  /* pages passed in are a gift */

static inline int splice(int fdin, loff_t *off_in, int fdout, loff_t *off_out,
			 size_t len, unsigned int flags)
{
	return syscall(__NR_sys_splice, fdin, off_in, fdout, off_out, len, flags);
}

static inline int tee(int fdin, int fdout, size_t len, unsigned int flags)
{
	return syscall(__NR_sys_tee, fdin, fdout, len, flags);
}

static inline int vmsplice(int fd, const struct iovec *iov,
			   unsigned long nr_segs, unsigned int flags)
{
	return syscall(__NR_sys_vmsplice, fd, iov, nr_segs, flags);
}
#endif

#define SPLICE_DEF_SIZE	(64*1024)

#ifdef FIO_HAVE_SYSLET

struct syslet_uatom;
struct async_head_user;

/*
 * syslet stuff
 */
static inline struct syslet_uatom *
async_exec(struct syslet_uatom *atom, struct async_head_user *ahu)
{
	return (struct syslet_uatom *) syscall(__NR_async_exec, atom, ahu);
}

static inline long
async_wait(unsigned long min_wait_events, unsigned long user_ring_idx,
	   struct async_head_user *ahu)
{
	return syscall(__NR_async_wait, min_wait_events,
			user_ring_idx, ahu);
}

static inline long async_thread(void *event, struct async_head_user *ahu)
{
	return syscall(__NR_async_thread, event, ahu);
}

static inline long umem_add(unsigned long *uptr, unsigned long inc)
{
	return syscall(__NR_umem_add, uptr, inc);
}
#endif /* FIO_HAVE_SYSLET */

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

#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 MADV_REMOVE
#define FIO_MADV_FREE	MADV_REMOVE
#endif

#if __BYTE_ORDER == __LITTLE_ENDIAN
#define FIO_LITTLE_ENDIAN
#elif __BYTE_ORDER == __BIG_ENDIAN
#define FIO_BIG_ENDIAN
#else
#error "Unknown endianness"
#endif

#define fio_swap16(x)	__bswap_16(x)
#define fio_swap32(x)	__bswap_32(x)
#define fio_swap64(x)	__bswap_64(x)

#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);
}

static inline unsigned long long get_fs_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(int fd, unsigned long long start,
			  unsigned long long len)
{
	uint64_t range[2];

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

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

	return errno;
}

#endif
Commit	Line	Data
ebac4655 JA	1	#ifndef FIO_OS_LINUX_H
	2	#define FIO_OS_LINUX_H
	3
cca84643 JA	4	#define FIO_OS os_linux
cca84643 JA	5
ebac4655	6	#include <sys/ioctl.h>
8756e4d4	7	#include <sys/uio.h>
3c39a379	8	#include <sys/syscall.h>
2e3bd4c2	9	#include <sys/vfs.h>
3c39a379	10	#include <unistd.h>
97fbdfa1	11	#include <fcntl.h>
3c2d93ed	12	#include <errno.h>
d09913c2	13	#include <sched.h>
ea421790	14	#include <linux/unistd.h>
07e5b264 JA	15	#include <linux/raw.h>
07e5b264 JA	16	#include <linux/major.h>
610a730c	17	#include <endian.h>
ebac4655	18
f3de88a7	19	#include "indirect.h"
79a43187	20	#include "binject.h"
e2e58886	21	#include "../file.h"
f3de88a7	22
ebac4655 JA	23	#define FIO_HAVE_LIBAIO
	24	#define FIO_HAVE_POSIXAIO
	25	#define FIO_HAVE_FADVISE
	26	#define FIO_HAVE_CPU_AFFINITY
	27	#define FIO_HAVE_DISK_UTIL
	28	#define FIO_HAVE_SGIO
ba4f8923	29	#define FIO_HAVE_IOPRIO
8756e4d4	30	#define FIO_HAVE_SPLICE
22f78b32	31	#define FIO_HAVE_IOSCHED_SWITCH
2c0ecd28	32	#define FIO_HAVE_ODIRECT
74b025b0	33	#define FIO_HAVE_HUGETLB
07e5b264	34	#define FIO_HAVE_RAWBIND
5e62c22a	35	#define FIO_HAVE_BLKTRACE
5921e80c	36	#define FIO_HAVE_STRSEP
207cb0f0	37	#define FIO_HAVE_POSIXAIO_FSYNC
f356d01d	38	#define FIO_HAVE_PSHARED_MUTEX
eb7ccf38	39	#define FIO_HAVE_CL_SIZE
a696fa2a	40	#define FIO_HAVE_CGROUPS
c36d16f5	41	#define FIO_HAVE_FDATASYNC
2e3bd4c2	42	#define FIO_HAVE_FS_STAT
a5f3027c	43	#define FIO_HAVE_TRIM
79a43187	44	#define FIO_HAVE_BINJECT
ecc314ba	45	#define FIO_HAVE_CLOCK_MONOTONIC
47f767c1	46	#define FIO_HAVE_GETTID
93bcfd20	47	#define FIO_USE_GENERIC_INIT_RANDOM_STATE
b6959b55	48
804bb9a1 JA	49	/*
	50	* Can only enable this for newer glibcs, or the header and defines are
	51	* missing
	52	*/
52ad4b94 JA	53	#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 6
	54	#define FIO_HAVE_FALLOCATE
	55	#endif
78b269e3	56	#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 8
804bb9a1 JA	57	#define FIO_HAVE_LINUX_FALLOCATE
	58	#endif
	59
093729f7 JA	60	#ifdef SYNC_FILE_RANGE_WAIT_BEFORE
	61	#define FIO_HAVE_SYNC_FILE_RANGE
	62	#endif
	63
dc873b6f	64	#define OS_MAP_ANON MAP_ANONYMOUS
ebac4655	65
4d8947de SL	66	#ifndef CLOCK_MONOTONIC
	67	#define CLOCK_MONOTONIC 1
	68	#endif
	69
ebac4655	70	typedef cpu_set_t os_cpu_mask_t;
4e78e405	71
6dfd46b9	72	typedef struct drand48_data os_random_state_t;
ebac4655 JA	73
	74	/*
	75	* we want fadvise64 really, but it's so tangled... later
	76	*/
4d8947de	77	#ifdef FIO_HAVE_FADVISE
ebac4655 JA	78	#define fadvise(fd, off, len, advice) \
ebac4655 JA	79	posix_fadvise((fd), (off_t)(off), (len), (advice))
4d8947de	80	#endif
ebac4655	81
c8f025f8 JA	82	/*
	83	* If you are on an ancient glibc (2.3.2), then define GLIBC_2_3_2 if you want
	84	* the affinity helpers to work.
	85	*/
	86	#ifndef GLIBC_2_3_2
e8462bd8 JA	87	#define fio_setaffinity(pid, cpumask) \
e8462bd8 JA	88	sched_setaffinity((pid), sizeof(cpumask), &(cpumask))
ebac4655 JA	89	#define fio_getaffinity(pid, ptr) \
ebac4655 JA	90	sched_getaffinity((pid), sizeof(cpu_set_t), (ptr))
c8f025f8	91	#else
e8462bd8 JA	92	#define fio_setaffinity(pid, cpumask) \
e8462bd8 JA	93	sched_setaffinity((pid), &(cpumask))
c8f025f8 JA	94	#define fio_getaffinity(pid, ptr) \
	95	sched_getaffinity((pid), (ptr))
	96	#endif
be4ecfdf	97
1f4c0a4f JA	98	#define fio_cpu_clear(mask, cpu) (void) CPU_CLR((cpu), (mask))
1f4c0a4f JA	99	#define fio_cpu_set(mask, cpu) (void) CPU_SET((cpu), (mask))
d2ce18b5 JA	100
	101	static inline int fio_cpuset_init(os_cpu_mask_t *mask)
	102	{
	103	CPU_ZERO(mask);
	104	return 0;
	105	}
	106
	107	static inline int fio_cpuset_exit(os_cpu_mask_t *mask)
	108	{
	109	return 0;
	110	}
6d459ee7 JA	111
6d459ee7 JA	112	#define FIO_MAX_CPUS CPU_SETSIZE
4d8947de	113
ebac4655 JA	114	static inline int ioprio_set(int which, int who, int ioprio)
	115	{
	116	return syscall(__NR_ioprio_set, which, who, ioprio);
	117	}
	118
47f767c1 JA	119	static inline int gettid(void)
	120	{
	121	return syscall(__NR_gettid);
	122	}
	123
97fbdfa1 JA	124	/*
	125	* Just check for SPLICE_F_MOVE, if that isn't there, assume the others
	126	* aren't either.
	127	*/
	128	#ifndef SPLICE_F_MOVE
	129	#define SPLICE_F_MOVE (0x01) /* move pages instead of copying */
	130	#define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
	131	/* we may still block on the fd we splice */
	132	/* from/to, of course */
	133	#define SPLICE_F_MORE (0x04) /* expect more data */
	134	#define SPLICE_F_GIFT (0x08) /* pages passed in are a gift */
8756e4d4 JA	135
8756e4d4 JA	136	static inline int splice(int fdin, loff_t off_in, int fdout, loff_t off_out,
495ee9b6	137	size_t len, unsigned int flags)
8756e4d4	138	{
97fbdfa1	139	return syscall(__NR_sys_splice, fdin, off_in, fdout, off_out, len, flags);
8756e4d4 JA	140	}
	141
	142	static inline int tee(int fdin, int fdout, size_t len, unsigned int flags)
	143	{
97fbdfa1	144	return syscall(__NR_sys_tee, fdin, fdout, len, flags);
8756e4d4 JA	145	}
	146
	147	static inline int vmsplice(int fd, const struct iovec *iov,
	148	unsigned long nr_segs, unsigned int flags)
	149	{
97fbdfa1	150	return syscall(__NR_sys_vmsplice, fd, iov, nr_segs, flags);
8756e4d4	151	}
97fbdfa1	152	#endif
8756e4d4	153
3feedc60 JA	154	#define SPLICE_DEF_SIZE (64*1024)
3feedc60 JA	155
b6959b55	156	#ifdef FIO_HAVE_SYSLET
bf0dc8fa IM	157
	158	struct syslet_uatom;
	159	struct async_head_user;
	160
a4f4fdd7 JA	161	/*
	162	* syslet stuff
	163	*/
bf0dc8fa IM	164	static inline struct syslet_uatom *
bf0dc8fa IM	165	async_exec(struct syslet_uatom atom, struct async_head_user ahu)
a4f4fdd7	166	{
2b52511f	167	return (struct syslet_uatom *) syscall(__NR_async_exec, atom, ahu);
a4f4fdd7 JA	168	}
a4f4fdd7 JA	169
bf0dc8fa IM	170	static inline long
	171	async_wait(unsigned long min_wait_events, unsigned long user_ring_idx,
	172	struct async_head_user *ahu)
a4f4fdd7	173	{
bf0dc8fa IM	174	return syscall(__NR_async_wait, min_wait_events,
bf0dc8fa IM	175	user_ring_idx, ahu);
a4f4fdd7 JA	176	}
a4f4fdd7 JA	177
7756b0d0	178	static inline long async_thread(void event, struct async_head_user ahu)
a4f4fdd7	179	{
7756b0d0	180	return syscall(__NR_async_thread, event, ahu);
a4f4fdd7 JA	181	}
	182
	183	static inline long umem_add(unsigned long *uptr, unsigned long inc)
	184	{
	185	return syscall(__NR_umem_add, uptr, inc);
	186	}
b6959b55	187	#endif /* FIO_HAVE_SYSLET */
a4f4fdd7	188
6cefbe33 JA	189	enum {
	190	IOPRIO_CLASS_NONE,
	191	IOPRIO_CLASS_RT,
	192	IOPRIO_CLASS_BE,
	193	IOPRIO_CLASS_IDLE,
	194	};
	195
ebac4655 JA	196	enum {
	197	IOPRIO_WHO_PROCESS = 1,
	198	IOPRIO_WHO_PGRP,
	199	IOPRIO_WHO_USER,
	200	};
	201
6cefbe33	202	#define IOPRIO_BITS 16
ebac4655 JA	203	#define IOPRIO_CLASS_SHIFT 13
	204
	205	#ifndef BLKGETSIZE64
	206	#define BLKGETSIZE64 _IOR(0x12,114,size_t)
	207	#endif
	208
e5b401d4 JA	209	#ifndef BLKFLSBUF
	210	#define BLKFLSBUF _IO(0x12,97)
	211	#endif
	212
a5f3027c JA	213	#ifndef BLKDISCARD
	214	#define BLKDISCARD _IO(0x12,119)
	215	#endif
	216
e2e58886	217	static inline int blockdev_invalidate_cache(struct fio_file *f)
e5b401d4	218	{
ecc314ba	219	return ioctl(f->fd, BLKFLSBUF);
e5b401d4 JA	220	}
e5b401d4 JA	221
ecc314ba	222	static inline int blockdev_size(struct fio_file f, unsigned long long bytes)
ebac4655	223	{
ecc314ba	224	if (!ioctl(f->fd, BLKGETSIZE64, bytes))
ebac4655 JA	225	return 0;
	226
	227	return errno;
	228	}
	229
32cd46a0 JA	230	static inline unsigned long long os_phys_mem(void)
	231	{
	232	long pagesize, pages;
	233
	234	pagesize = sysconf(_SC_PAGESIZE);
	235	pages = sysconf(_SC_PHYS_PAGES);
	236	if (pages == -1 \|\| pagesize == -1)
	237	return 0;
	238
	239	return (unsigned long long) pages * (unsigned long long) pagesize;
	240	}
	241
6dfd46b9 JA	242	static inline void os_random_seed(unsigned long seed, os_random_state_t *rs)
	243	{
	244	srand48_r(seed, rs);
	245	}
	246
	247	static inline long os_random_long(os_random_state_t *rs)
	248	{
	249	long val;
	250
	251	lrand48_r(rs, &val);
	252	return val;
	253	}
	254
8cc7afa9	255	static inline int fio_lookup_raw(dev_t dev, int majdev, int mindev)
07e5b264 JA	256	{
	257	struct raw_config_request rq;
	258	int fd;
	259
	260	if (major(dev) != RAW_MAJOR)
8cc7afa9	261	return 1;
07e5b264 JA	262
	263	/*
	264	* we should be able to find /dev/rawctl or /dev/raw/rawctl
	265	*/
	266	fd = open("/dev/rawctl", O_RDONLY);
	267	if (fd < 0) {
	268	fd = open("/dev/raw/rawctl", O_RDONLY);
	269	if (fd < 0)
8cc7afa9	270	return 1;
07e5b264 JA	271	}
	272
	273	rq.raw_minor = minor(dev);
	274	if (ioctl(fd, RAW_GETBIND, &rq) < 0) {
	275	close(fd);
8cc7afa9	276	return 1;
07e5b264 JA	277	}
	278
	279	close(fd);
	280	*majdev = rq.block_major;
	281	*mindev = rq.block_minor;
8cc7afa9	282	return 0;
07e5b264 JA	283	}
07e5b264 JA	284
5b6f5c66	285	#ifdef O_NOATIME
5921e80c	286	#define FIO_O_NOATIME O_NOATIME
5b6f5c66 JA	287	#else
	288	#define FIO_O_NOATIME 0
	289	#endif
5921e80c	290
a1c58075 JA	291	#ifdef MADV_REMOVE
	292	#define FIO_MADV_FREE MADV_REMOVE
	293	#endif
	294
610a730c JA	295	#if __BYTE_ORDER == __LITTLE_ENDIAN
	296	#define FIO_LITTLE_ENDIAN
	297	#elif __BYTE_ORDER == __BIG_ENDIAN
	298	#define FIO_BIG_ENDIAN
	299	#else
	300	#error "Unknown endianness"
	301	#endif
	302
ff245192 JA	303	#define fio_swap16(x) __bswap_16(x)
	304	#define fio_swap32(x) __bswap_32(x)
	305	#define fio_swap64(x) __bswap_64(x)
	306
eb7ccf38 JA	307	#define CACHE_LINE_FILE \
	308	"/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"
	309
	310	static inline int arch_cache_line_size(void)
	311	{
	312	char size[32];
	313	int fd, ret;
	314
	315	fd = open(CACHE_LINE_FILE, O_RDONLY);
	316	if (fd < 0)
	317	return -1;
	318
	319	ret = read(fd, size, sizeof(size));
ec76f15a JA	320
	321	close(fd);
	322
eb7ccf38 JA	323	if (ret <= 0)
eb7ccf38 JA	324	return -1;
ec76f15a JA	325	else
ec76f15a JA	326	return atoi(size);
eb7ccf38 JA	327	}
eb7ccf38 JA	328
2e3bd4c2 JA	329	static inline unsigned long long get_fs_size(const char *path)
	330	{
	331	unsigned long long ret;
	332	struct statfs s;
	333
	334	if (statfs(path, &s) < 0)
	335	return -1ULL;
	336
	337	ret = s.f_bsize;
	338	ret *= (unsigned long long) s.f_bfree;
	339	return ret;
	340	}
	341
a5f3027c JA	342	static inline int os_trim(int fd, unsigned long long start,
	343	unsigned long long len)
	344	{
	345	uint64_t range[2];
	346
	347	range[0] = start;
	348	range[1] = len;
	349
	350	if (!ioctl(fd, BLKDISCARD, range))
	351	return 0;
	352
	353	return errno;
	354	}
	355
ebac4655	356	#endif