[fio.git] / engines / mmap.c

/*
 * regular read/write sync io engine
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <sys/mman.h>

#include "../fio.h"
#include "../os.h"

static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	unsigned long long real_off = io_u->offset - f->file_offset;

	if (io_u->ddir == DDIR_READ)
		memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
	else if (io_u->ddir == DDIR_WRITE)
		memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
	else if (io_u->ddir == DDIR_SYNC) {
		size_t len = (f->file_size + page_size - 1) & ~page_mask;

		if (msync(f->mmap, len, MS_SYNC)) {
			io_u->error = errno;
			td_verror(td, io_u->error, "msync");
		}
	}

	/*
	 * not really direct, but should drop the pages from the cache
	 */
	if (td->odirect && io_u->ddir != DDIR_SYNC) {
		size_t len = (io_u->xfer_buflen + page_size - 1) & ~page_mask;
		unsigned long long off = real_off & ~page_mask;

		if (msync(f->mmap + off, len, MS_SYNC) < 0) {
			io_u->error = errno;
			td_verror(td, io_u->error, "msync");
		}
		if (madvise(f->mmap + off, len,  MADV_DONTNEED) < 0) {
			io_u->error = errno;
			td_verror(td, io_u->error, "madvise");
		}
	}

	return FIO_Q_COMPLETED;
}

static int fio_mmapio_open(struct thread_data *td, struct fio_file *f)
{
	int ret, flags;

	ret = generic_open_file(td, f);
	if (ret)
		return ret;

	if (td_rw(td))
		flags = PROT_READ | PROT_WRITE;
	else if (td_write(td)) {
		flags = PROT_WRITE;

		if (td->verify != VERIFY_NONE)
			flags |= PROT_READ;
	} else
		flags = PROT_READ;

	f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
	if (f->mmap == MAP_FAILED) {
		f->mmap = NULL;
		td_verror(td, errno, "mmap");
		goto err;
	}

	if (file_invalidate_cache(td, f))
		goto err;

	if (!td_random(td)) {
		if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
			td_verror(td, errno, "madvise");
			goto err;
		}
	} else {
		if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
			td_verror(td, errno, "madvise");
			goto err;
		}
	}

	return 0;

err:
	td->io_ops->close_file(td, f);
	return 1;
}

static void fio_mmapio_close(struct thread_data fio_unused *td,
			     struct fio_file *f)
{
	if (f->mmap) {
		munmap(f->mmap, f->file_size);
		f->mmap = NULL;
	}
	generic_close_file(td, f);
}

static struct ioengine_ops ioengine = {
	.name		= "mmap",
	.version	= FIO_IOOPS_VERSION,
	.queue		= fio_mmapio_queue,
	.open_file	= fio_mmapio_open,
	.close_file	= fio_mmapio_close,
	.flags		= FIO_SYNCIO | FIO_NOEXTEND,
};

static void fio_init fio_mmapio_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_mmapio_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
2866c82d JA	1	/*
	2	* regular read/write sync io engine
	3	*
	4	*/
	5	#include <stdio.h>
	6	#include <stdlib.h>
	7	#include <unistd.h>
	8	#include <errno.h>
	9	#include <assert.h>
	10	#include <sys/mman.h>
5f350952 JA	11
	12	#include "../fio.h"
	13	#include "../os.h"
2866c82d	14
2866c82d JA	15	static int fio_mmapio_queue(struct thread_data td, struct io_u io_u)
2866c82d JA	16	{
53cdc686 JA	17	struct fio_file *f = io_u->file;
53cdc686 JA	18	unsigned long long real_off = io_u->offset - f->file_offset;
2866c82d JA	19
2866c82d JA	20	if (io_u->ddir == DDIR_READ)
cec6b55d	21	memcpy(io_u->xfer_buf, f->mmap + real_off, io_u->xfer_buflen);
87dc1ab1	22	else if (io_u->ddir == DDIR_WRITE)
cec6b55d	23	memcpy(f->mmap + real_off, io_u->xfer_buf, io_u->xfer_buflen);
b907a5b5	24	else if (io_u->ddir == DDIR_SYNC) {
cfc99db7 JA	25	size_t len = (f->file_size + page_size - 1) & ~page_mask;
	26
	27	if (msync(f->mmap, len, MS_SYNC)) {
b907a5b5	28	io_u->error = errno;
cfc99db7 JA	29	td_verror(td, io_u->error, "msync");
cfc99db7 JA	30	}
b907a5b5	31	}
2866c82d JA	32
	33	/*
	34	* not really direct, but should drop the pages from the cache
	35	*/
b907a5b5	36	if (td->odirect && io_u->ddir != DDIR_SYNC) {
cfc99db7 JA	37	size_t len = (io_u->xfer_buflen + page_size - 1) & ~page_mask;
	38	unsigned long long off = real_off & ~page_mask;
	39
	40	if (msync(f->mmap + off, len, MS_SYNC) < 0) {
2866c82d	41	io_u->error = errno;
cfc99db7 JA	42	td_verror(td, io_u->error, "msync");
	43	}
	44	if (madvise(f->mmap + off, len, MADV_DONTNEED) < 0) {
2866c82d	45	io_u->error = errno;
cfc99db7 JA	46	td_verror(td, io_u->error, "madvise");
cfc99db7 JA	47	}
2866c82d JA	48	}
2866c82d JA	49
36167d82	50	return FIO_Q_COMPLETED;
2866c82d JA	51	}
2866c82d JA	52
b5af8293 JA	53	static int fio_mmapio_open(struct thread_data td, struct fio_file f)
	54	{
	55	int ret, flags;
	56
	57	ret = generic_open_file(td, f);
	58	if (ret)
	59	return ret;
	60
	61	if (td_rw(td))
	62	flags = PROT_READ \| PROT_WRITE;
	63	else if (td_write(td)) {
	64	flags = PROT_WRITE;
	65
	66	if (td->verify != VERIFY_NONE)
	67	flags \|= PROT_READ;
	68	} else
	69	flags = PROT_READ;
	70
	71	f->mmap = mmap(NULL, f->file_size, flags, MAP_SHARED, f->fd, f->file_offset);
	72	if (f->mmap == MAP_FAILED) {
	73	f->mmap = NULL;
	74	td_verror(td, errno, "mmap");
	75	goto err;
	76	}
	77
	78	if (file_invalidate_cache(td, f))
	79	goto err;
	80
	81	if (!td_random(td)) {
	82	if (madvise(f->mmap, f->file_size, MADV_SEQUENTIAL) < 0) {
	83	td_verror(td, errno, "madvise");
	84	goto err;
	85	}
	86	} else {
	87	if (madvise(f->mmap, f->file_size, MADV_RANDOM) < 0) {
	88	td_verror(td, errno, "madvise");
	89	goto err;
	90	}
	91	}
	92
	93	return 0;
	94
	95	err:
0263882a	96	td->io_ops->close_file(td, f);
b5af8293 JA	97	return 1;
	98	}
	99
	100	static void fio_mmapio_close(struct thread_data fio_unused *td,
	101	struct fio_file *f)
	102	{
	103	if (f->mmap) {
	104	munmap(f->mmap, f->file_size);
	105	f->mmap = NULL;
	106	}
0263882a	107	generic_close_file(td, f);
b5af8293 JA	108	}
b5af8293 JA	109
5f350952	110	static struct ioengine_ops ioengine = {
2866c82d JA	111	.name = "mmap",
2866c82d JA	112	.version = FIO_IOOPS_VERSION,
2866c82d	113	.queue = fio_mmapio_queue,
b5af8293 JA	114	.open_file = fio_mmapio_open,
b5af8293 JA	115	.close_file = fio_mmapio_close,
0263882a	116	.flags = FIO_SYNCIO \| FIO_NOEXTEND,
2866c82d	117	};
5f350952 JA	118
	119	static void fio_init fio_mmapio_register(void)
	120	{
	121	register_ioengine(&ioengine);
	122	}
	123
	124	static void fio_exit fio_mmapio_unregister(void)
	125	{
	126	unregister_ioengine(&ioengine);
	127	}