[fio.git] / engines / mmap.c

/*
 * mmap engine
 *
 * IO engine that reads/writes from files by doing memcpy to/from
 * a memory mapped region of the file.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>

#include "../fio.h"
#include "../verify.h"

/*
 * Limits us to 1GiB of mapped files in total
 */
#define MMAP_TOTAL_SZ	(1 * 1024 * 1024 * 1024UL)

static unsigned long mmap_map_size;

struct fio_mmap_data {
	void *mmap_ptr;
	size_t mmap_sz;
	off_t mmap_off;
};

static bool fio_madvise_file(struct thread_data *td, struct fio_file *f,
			     size_t length)

{
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);

	if (!td->o.fadvise_hint)
		return true;

	if (!td_random(td)) {
		if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_SEQUENTIAL) < 0) {
			td_verror(td, errno, "madvise");
			return false;
		}
	} else {
		if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_RANDOM) < 0) {
			td_verror(td, errno, "madvise");
			return false;
		}
	}

	return true;
}

static int fio_mmap_file(struct thread_data *td, struct fio_file *f,
			 size_t length, off_t off)
{
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	int flags = 0;

	if (td_rw(td) && !td->o.verify_only)
		flags = PROT_READ | PROT_WRITE;
	else if (td_write(td) && !td->o.verify_only) {
		flags = PROT_WRITE;

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

	fmd->mmap_ptr = mmap(NULL, length, flags, MAP_SHARED, f->fd, off);
	if (fmd->mmap_ptr == MAP_FAILED) {
		fmd->mmap_ptr = NULL;
		td_verror(td, errno, "mmap");
		goto err;
	}

	if (!fio_madvise_file(td, f, length))
		goto err;

	if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_DONTNEED) < 0) {
		td_verror(td, errno, "madvise");
		goto err;
	}

#ifdef FIO_MADV_FREE
	if (f->filetype == FIO_TYPE_BLOCK)
		(void) posix_madvise(fmd->mmap_ptr, fmd->mmap_sz, FIO_MADV_FREE);
#endif

err:
	if (td->error && fmd->mmap_ptr)
		munmap(fmd->mmap_ptr, length);

	return td->error;
}

/*
 * Just mmap an appropriate portion, we cannot mmap the full extent
 */
static int fio_mmapio_prep_limited(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);

	if (io_u->buflen > mmap_map_size) {
		log_err("fio: bs too big for mmap engine\n");
		return EIO;
	}

	fmd->mmap_sz = mmap_map_size;
	if (fmd->mmap_sz  > f->io_size)
		fmd->mmap_sz = f->io_size;

	fmd->mmap_off = io_u->offset;

	return fio_mmap_file(td, f, fmd->mmap_sz, fmd->mmap_off);
}

/*
 * Attempt to mmap the entire file
 */
static int fio_mmapio_prep_full(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	int ret;

	if (fio_file_partial_mmap(f))
		return EINVAL;
	if (io_u->offset != (size_t) io_u->offset ||
	    f->io_size != (size_t) f->io_size) {
		fio_file_set_partial_mmap(f);
		return EINVAL;
	}

	fmd->mmap_sz = f->io_size;
	fmd->mmap_off = 0;

	ret = fio_mmap_file(td, f, fmd->mmap_sz, fmd->mmap_off);
	if (ret)
		fio_file_set_partial_mmap(f);

	return ret;
}

static int fio_mmapio_prep(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	int ret;

	/*
	 * It fits within existing mapping, use it
	 */
	if (io_u->offset >= fmd->mmap_off &&
	    io_u->offset + io_u->buflen <= fmd->mmap_off + fmd->mmap_sz)
		goto done;

	/*
	 * unmap any existing mapping
	 */
	if (fmd->mmap_ptr) {
		if (munmap(fmd->mmap_ptr, fmd->mmap_sz) < 0)
			return errno;
		fmd->mmap_ptr = NULL;
	}

	if (fio_mmapio_prep_full(td, io_u)) {
		td_clear_error(td);
		ret = fio_mmapio_prep_limited(td, io_u);
		if (ret)
			return ret;
	}

done:
	io_u->mmap_data = fmd->mmap_ptr + io_u->offset - fmd->mmap_off -
				f->file_offset;
	return 0;
}

static int fio_mmapio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);

	fio_ro_check(td, io_u);

	if (io_u->ddir == DDIR_READ)
		memcpy(io_u->xfer_buf, io_u->mmap_data, io_u->xfer_buflen);
	else if (io_u->ddir == DDIR_WRITE)
		memcpy(io_u->mmap_data, io_u->xfer_buf, io_u->xfer_buflen);
	else if (ddir_sync(io_u->ddir)) {
		if (msync(fmd->mmap_ptr, fmd->mmap_sz, MS_SYNC)) {
			io_u->error = errno;
			td_verror(td, io_u->error, "msync");
		}
	} else if (io_u->ddir == DDIR_TRIM) {
		int ret = do_io_u_trim(td, io_u);

		if (!ret)
			td_verror(td, io_u->error, "trim");
	}


	/*
	 * not really direct, but should drop the pages from the cache
	 */
	if (td->o.odirect && ddir_rw(io_u->ddir)) {
		if (msync(io_u->mmap_data, io_u->xfer_buflen, MS_SYNC) < 0) {
			io_u->error = errno;
			td_verror(td, io_u->error, "msync");
		}
		if (posix_madvise(io_u->mmap_data, io_u->xfer_buflen, POSIX_MADV_DONTNEED) < 0) {
			io_u->error = errno;
			td_verror(td, io_u->error, "madvise");
		}
	}

	return FIO_Q_COMPLETED;
}

static int fio_mmapio_init(struct thread_data *td)
{
	struct thread_options *o = &td->o;

	if ((o->rw_min_bs & page_mask) &&
	    (o->odirect || o->fsync_blocks || o->fdatasync_blocks)) {
		log_err("fio: mmap options dictate a minimum block size of "
			"%llu bytes\n", (unsigned long long) page_size);
		return 1;
	}

	mmap_map_size = MMAP_TOTAL_SZ / o->nr_files;
	return 0;
}

static int fio_mmapio_open_file(struct thread_data *td, struct fio_file *f)
{
	struct fio_mmap_data *fmd;
	int ret;

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

	fmd = calloc(1, sizeof(*fmd));
	if (!fmd) {
		int fio_unused __ret;
		__ret = generic_close_file(td, f);
		return 1;
	}

	FILE_SET_ENG_DATA(f, fmd);
	return 0;
}

static int fio_mmapio_close_file(struct thread_data *td, struct fio_file *f)
{
	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);

	FILE_SET_ENG_DATA(f, NULL);
	free(fmd);
	fio_file_clear_partial_mmap(f);

	return generic_close_file(td, f);
}

static struct ioengine_ops ioengine = {
	.name		= "mmap",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_mmapio_init,
	.prep		= fio_mmapio_prep,
	.queue		= fio_mmapio_queue,
	.open_file	= fio_mmapio_open_file,
	.close_file	= fio_mmapio_close_file,
	.get_file_size	= generic_get_file_size,
	.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
	1	/*
	2	* mmap engine
	3	*
	4	* IO engine that reads/writes from files by doing memcpy to/from
	5	* a memory mapped region of the file.
	6	*
	7	*/
	8	#include <stdio.h>
	9	#include <stdlib.h>
	10	#include <unistd.h>
	11	#include <errno.h>
	12	#include <sys/mman.h>
	13
	14	#include "../fio.h"
	15	#include "../verify.h"
	16
	17	/*
	18	* Limits us to 1GiB of mapped files in total
	19	*/
	20	#define MMAP_TOTAL_SZ (1 * 1024 * 1024 * 1024UL)
	21
	22	static unsigned long mmap_map_size;
	23
	24	struct fio_mmap_data {
	25	void *mmap_ptr;
	26	size_t mmap_sz;
	27	off_t mmap_off;
	28	};
	29
	30	static bool fio_madvise_file(struct thread_data td, struct fio_file f,
	31	size_t length)
	32
	33	{
	34	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	35
	36	if (!td->o.fadvise_hint)
	37	return true;
	38
	39	if (!td_random(td)) {
	40	if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_SEQUENTIAL) < 0) {
	41	td_verror(td, errno, "madvise");
	42	return false;
	43	}
	44	} else {
	45	if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_RANDOM) < 0) {
	46	td_verror(td, errno, "madvise");
	47	return false;
	48	}
	49	}
	50
	51	return true;
	52	}
	53
	54	static int fio_mmap_file(struct thread_data td, struct fio_file f,
	55	size_t length, off_t off)
	56	{
	57	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	58	int flags = 0;
	59
	60	if (td_rw(td) && !td->o.verify_only)
	61	flags = PROT_READ \| PROT_WRITE;
	62	else if (td_write(td) && !td->o.verify_only) {
	63	flags = PROT_WRITE;
	64
	65	if (td->o.verify != VERIFY_NONE)
	66	flags \|= PROT_READ;
	67	} else
	68	flags = PROT_READ;
	69
	70	fmd->mmap_ptr = mmap(NULL, length, flags, MAP_SHARED, f->fd, off);
	71	if (fmd->mmap_ptr == MAP_FAILED) {
	72	fmd->mmap_ptr = NULL;
	73	td_verror(td, errno, "mmap");
	74	goto err;
	75	}
	76
	77	if (!fio_madvise_file(td, f, length))
	78	goto err;
	79
	80	if (posix_madvise(fmd->mmap_ptr, length, POSIX_MADV_DONTNEED) < 0) {
	81	td_verror(td, errno, "madvise");
	82	goto err;
	83	}
	84
	85	#ifdef FIO_MADV_FREE
	86	if (f->filetype == FIO_TYPE_BLOCK)
	87	(void) posix_madvise(fmd->mmap_ptr, fmd->mmap_sz, FIO_MADV_FREE);
	88	#endif
	89
	90	err:
	91	if (td->error && fmd->mmap_ptr)
	92	munmap(fmd->mmap_ptr, length);
	93
	94	return td->error;
	95	}
	96
	97	/*
	98	* Just mmap an appropriate portion, we cannot mmap the full extent
	99	*/
	100	static int fio_mmapio_prep_limited(struct thread_data td, struct io_u io_u)
	101	{
	102	struct fio_file *f = io_u->file;
	103	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	104
	105	if (io_u->buflen > mmap_map_size) {
	106	log_err("fio: bs too big for mmap engine\n");
	107	return EIO;
	108	}
	109
	110	fmd->mmap_sz = mmap_map_size;
	111	if (fmd->mmap_sz > f->io_size)
	112	fmd->mmap_sz = f->io_size;
	113
	114	fmd->mmap_off = io_u->offset;
	115
	116	return fio_mmap_file(td, f, fmd->mmap_sz, fmd->mmap_off);
	117	}
	118
	119	/*
	120	* Attempt to mmap the entire file
	121	*/
	122	static int fio_mmapio_prep_full(struct thread_data td, struct io_u io_u)
	123	{
	124	struct fio_file *f = io_u->file;
	125	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	126	int ret;
	127
	128	if (fio_file_partial_mmap(f))
	129	return EINVAL;
	130	if (io_u->offset != (size_t) io_u->offset \|\|
	131	f->io_size != (size_t) f->io_size) {
	132	fio_file_set_partial_mmap(f);
	133	return EINVAL;
	134	}
	135
	136	fmd->mmap_sz = f->io_size;
	137	fmd->mmap_off = 0;
	138
	139	ret = fio_mmap_file(td, f, fmd->mmap_sz, fmd->mmap_off);
	140	if (ret)
	141	fio_file_set_partial_mmap(f);
	142
	143	return ret;
	144	}
	145
	146	static int fio_mmapio_prep(struct thread_data td, struct io_u io_u)
	147	{
	148	struct fio_file *f = io_u->file;
	149	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	150	int ret;
	151
	152	/*
	153	* It fits within existing mapping, use it
	154	*/
	155	if (io_u->offset >= fmd->mmap_off &&
	156	io_u->offset + io_u->buflen <= fmd->mmap_off + fmd->mmap_sz)
	157	goto done;
	158
	159	/*
	160	* unmap any existing mapping
	161	*/
	162	if (fmd->mmap_ptr) {
	163	if (munmap(fmd->mmap_ptr, fmd->mmap_sz) < 0)
	164	return errno;
	165	fmd->mmap_ptr = NULL;
	166	}
	167
	168	if (fio_mmapio_prep_full(td, io_u)) {
	169	td_clear_error(td);
	170	ret = fio_mmapio_prep_limited(td, io_u);
	171	if (ret)
	172	return ret;
	173	}
	174
	175	done:
	176	io_u->mmap_data = fmd->mmap_ptr + io_u->offset - fmd->mmap_off -
	177	f->file_offset;
	178	return 0;
	179	}
	180
	181	static int fio_mmapio_queue(struct thread_data td, struct io_u io_u)
	182	{
	183	struct fio_file *f = io_u->file;
	184	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	185
	186	fio_ro_check(td, io_u);
	187
	188	if (io_u->ddir == DDIR_READ)
	189	memcpy(io_u->xfer_buf, io_u->mmap_data, io_u->xfer_buflen);
	190	else if (io_u->ddir == DDIR_WRITE)
	191	memcpy(io_u->mmap_data, io_u->xfer_buf, io_u->xfer_buflen);
	192	else if (ddir_sync(io_u->ddir)) {
	193	if (msync(fmd->mmap_ptr, fmd->mmap_sz, MS_SYNC)) {
	194	io_u->error = errno;
	195	td_verror(td, io_u->error, "msync");
	196	}
	197	} else if (io_u->ddir == DDIR_TRIM) {
	198	int ret = do_io_u_trim(td, io_u);
	199
	200	if (!ret)
	201	td_verror(td, io_u->error, "trim");
	202	}
	203
	204
	205	/*
	206	* not really direct, but should drop the pages from the cache
	207	*/
	208	if (td->o.odirect && ddir_rw(io_u->ddir)) {
	209	if (msync(io_u->mmap_data, io_u->xfer_buflen, MS_SYNC) < 0) {
	210	io_u->error = errno;
	211	td_verror(td, io_u->error, "msync");
	212	}
	213	if (posix_madvise(io_u->mmap_data, io_u->xfer_buflen, POSIX_MADV_DONTNEED) < 0) {
	214	io_u->error = errno;
	215	td_verror(td, io_u->error, "madvise");
	216	}
	217	}
	218
	219	return FIO_Q_COMPLETED;
	220	}
	221
	222	static int fio_mmapio_init(struct thread_data *td)
	223	{
	224	struct thread_options *o = &td->o;
	225
	226	if ((o->rw_min_bs & page_mask) &&
	227	(o->odirect \|\| o->fsync_blocks \|\| o->fdatasync_blocks)) {
	228	log_err("fio: mmap options dictate a minimum block size of "
	229	"%llu bytes\n", (unsigned long long) page_size);
	230	return 1;
	231	}
	232
	233	mmap_map_size = MMAP_TOTAL_SZ / o->nr_files;
	234	return 0;
	235	}
	236
	237	static int fio_mmapio_open_file(struct thread_data td, struct fio_file f)
	238	{
	239	struct fio_mmap_data *fmd;
	240	int ret;
	241
	242	ret = generic_open_file(td, f);
	243	if (ret)
	244	return ret;
	245
	246	fmd = calloc(1, sizeof(*fmd));
	247	if (!fmd) {
	248	int fio_unused __ret;
	249	__ret = generic_close_file(td, f);
	250	return 1;
	251	}
	252
	253	FILE_SET_ENG_DATA(f, fmd);
	254	return 0;
	255	}
	256
	257	static int fio_mmapio_close_file(struct thread_data td, struct fio_file f)
	258	{
	259	struct fio_mmap_data *fmd = FILE_ENG_DATA(f);
	260
	261	FILE_SET_ENG_DATA(f, NULL);
	262	free(fmd);
	263	fio_file_clear_partial_mmap(f);
	264
	265	return generic_close_file(td, f);
	266	}
	267
	268	static struct ioengine_ops ioengine = {
	269	.name = "mmap",
	270	.version = FIO_IOOPS_VERSION,
	271	.init = fio_mmapio_init,
	272	.prep = fio_mmapio_prep,
	273	.queue = fio_mmapio_queue,
	274	.open_file = fio_mmapio_open_file,
	275	.close_file = fio_mmapio_close_file,
	276	.get_file_size = generic_get_file_size,
	277	.flags = FIO_SYNCIO \| FIO_NOEXTEND,
	278	};
	279
	280	static void fio_init fio_mmapio_register(void)
	281	{
	282	register_ioengine(&ioengine);
	283	}
	284
	285	static void fio_exit fio_mmapio_unregister(void)
	286	{
	287	unregister_ioengine(&ioengine);
	288	}