[fio.git] / engines / windowsaio.c

/*
 * windowsaio engine
 *
 * IO engine using Windows IO Completion Ports.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <windows.h>

#include "../fio.h"

typedef BOOL (WINAPI *CANCELIOEX)(HANDLE hFile, LPOVERLAPPED lpOverlapped);

int geterrno_from_win_error (DWORD code, int deferrno);

struct fio_overlapped {
	OVERLAPPED o;
	struct io_u *io_u;
	BOOL io_complete;
};

struct windowsaio_data {
	struct io_u **aio_events;
	HANDLE iocp;
	HANDLE iothread;
	HANDLE iocomplete_event;
	BOOL iothread_running;
};

struct thread_ctx {
	HANDLE iocp;
	struct windowsaio_data *wd;
};

static BOOL timeout_expired(DWORD start_count, DWORD end_count);
static int fio_windowsaio_getevents(struct thread_data *td, unsigned int min,
					unsigned int max, struct timespec *t);
static struct io_u *fio_windowsaio_event(struct thread_data *td, int event);
static int fio_windowsaio_queue(struct thread_data *td,
				  struct io_u *io_u);
static void fio_windowsaio_cleanup(struct thread_data *td);
static DWORD WINAPI IoCompletionRoutine(LPVOID lpParameter);
static int fio_windowsaio_init(struct thread_data *td);
static int fio_windowsaio_open_file(struct thread_data *td, struct fio_file *f);
static int fio_windowsaio_close_file(struct thread_data fio_unused *td, struct fio_file *f);

static int fio_windowsaio_init(struct thread_data *td)
{
	struct windowsaio_data *wd;
	int rc = 0;

	wd = calloc(1, sizeof(struct windowsaio_data));
	if (wd == NULL) {
		 log_err("windowsaio: failed to allocate memory for engine data\n");
		rc = 1;
	}

	if (!rc) {
		wd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u*));
		if (wd->aio_events == NULL) {
			log_err("windowsaio: failed to allocate memory for aio events list\n");
			rc = 1;
		}
	}

	if (!rc) {
		/* Create an auto-reset event */
		wd->iocomplete_event = CreateEvent(NULL, FALSE, FALSE, NULL);
		if (wd->iocomplete_event == NULL) {
			log_err("windowsaio: failed to create io complete event handle\n");
			rc = 1;
		}
	}

	if (rc) {
		if (wd != NULL) {
			if (wd->aio_events != NULL)
				free(wd->aio_events);

			free(wd);
		}
	}

	td->io_ops->data = wd;

	if (!rc) {
		struct thread_ctx *ctx;
		struct windowsaio_data *wd;
		HANDLE hFile;

		hFile = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
		if (hFile == INVALID_HANDLE_VALUE) {
			log_err("windowsaio: failed to create io completion port\n");
			rc = 1;
		}

		wd = td->io_ops->data;
		wd->iothread_running = TRUE;
		wd->iocp = hFile;

		if (!rc)
			ctx = malloc(sizeof(struct thread_ctx));

		if (!rc && ctx == NULL)
		{
			log_err("windowsaio: failed to allocate memory for thread context structure\n");
			CloseHandle(hFile);
			rc = 1;
		}

		if (!rc)
		{
			ctx->iocp = hFile;
			ctx->wd = wd;
			wd->iothread = CreateThread(NULL, 0, IoCompletionRoutine, ctx, 0, NULL);
			if (wd->iothread == NULL)
				log_err("windowsaio: failed to create io completion thread\n");
		}

		if (rc || wd->iothread == NULL)
			rc = 1;
	}

	return rc;
}

static void fio_windowsaio_cleanup(struct thread_data *td)
{
	struct windowsaio_data *wd;

	wd = td->io_ops->data;

	if (wd != NULL) {
		wd->iothread_running = FALSE;
		WaitForSingleObject(wd->iothread, INFINITE);

		CloseHandle(wd->iothread);
		CloseHandle(wd->iocomplete_event);

		free(wd->aio_events);
		free(wd);

		td->io_ops->data = NULL;
	}
}


static int fio_windowsaio_open_file(struct thread_data *td, struct fio_file *f)
{
	int rc = 0;
	DWORD flags = FILE_FLAG_POSIX_SEMANTICS | FILE_FLAG_OVERLAPPED;
	DWORD sharemode = FILE_SHARE_READ | FILE_SHARE_WRITE;
	DWORD openmode = OPEN_ALWAYS;
	DWORD access;

	dprint(FD_FILE, "fd open %s\n", f->file_name);

	if (f->filetype == FIO_TYPE_PIPE) {
		log_err("windowsaio: pipes are not supported\n");
		return 1;
	}

	if (!strcmp(f->file_name, "-")) {
		log_err("windowsaio: can't read/write to stdin/out\n");
		return 1;
	}

	if (td->o.odirect)
		flags |= FILE_FLAG_NO_BUFFERING;
	if (td->o.sync_io)
		flags |= FILE_FLAG_WRITE_THROUGH;

	/*
	 * Inform Windows whether we're going to be doing sequential or
	 * random io so it can tune the Cache Manager
	 */
	if (td->o.td_ddir == TD_DDIR_READ  ||
		td->o.td_ddir == TD_DDIR_WRITE)
		flags |= FILE_FLAG_SEQUENTIAL_SCAN;
	else
		flags |= FILE_FLAG_RANDOM_ACCESS;

	if (!td_write(td) || read_only)
		access = GENERIC_READ;
	else
		access = (GENERIC_READ | GENERIC_WRITE);

	if (td->o.create_on_open)
		openmode = OPEN_ALWAYS;
	else
		openmode = OPEN_EXISTING;

	f->hFile = CreateFile(f->file_name, access, sharemode,
		NULL, openmode, flags, NULL);

	if (f->hFile == INVALID_HANDLE_VALUE) {
		log_err("windowsaio: failed to open file \"%s\"\n", f->file_name);
		rc = 1;
	}

	/* Only set up the completion port and thread if we're not just
	 * querying the device size */
	if (!rc && td->io_ops->data != NULL) {
		struct windowsaio_data *wd;

		wd = td->io_ops->data;

		if (CreateIoCompletionPort(f->hFile, wd->iocp, 0, 0) == NULL) {
			log_err("windowsaio: failed to create io completion port\n");
			rc = 1;
		}
	}

	return rc;
}

static int fio_windowsaio_close_file(struct thread_data fio_unused *td, struct fio_file *f)
{
	int rc = 0;

	dprint(FD_FILE, "fd close %s\n", f->file_name);

	if (f->hFile != INVALID_HANDLE_VALUE) {
		if (!CloseHandle(f->hFile)) {
			log_info("windowsaio: failed to close file handle for \"%s\"\n", f->file_name);
			rc = 1;
		}
	}

	f->hFile = INVALID_HANDLE_VALUE;
	return rc;
}

static BOOL timeout_expired(DWORD start_count, DWORD end_count)
{
	BOOL expired = FALSE;
	DWORD current_time;

	current_time = GetTickCount();

	if ((end_count > start_count) && current_time >= end_count)
		expired = TRUE;
	else if (current_time < start_count && current_time > end_count)
		expired = TRUE;

	return expired;
}

static struct io_u* fio_windowsaio_event(struct thread_data *td, int event)
{
	struct windowsaio_data *wd = td->io_ops->data;
	return wd->aio_events[event];
}

static int fio_windowsaio_getevents(struct thread_data *td, unsigned int min,
					unsigned int max, struct timespec *t)
{
	struct windowsaio_data *wd = td->io_ops->data;
	struct flist_head *entry;
	unsigned int dequeued = 0;
	struct io_u *io_u;
	struct fio_overlapped *fov;
	DWORD start_count = 0;
	DWORD end_count = 0;
	DWORD status;
	DWORD mswait = 250;

	if (t != NULL) {
		mswait = (t->tv_sec * 1000) + (t->tv_nsec / 1000000);
		start_count = GetTickCount();
		end_count = start_count + (t->tv_sec * 1000) + (t->tv_nsec / 1000000);
	}

	do {
		flist_for_each(entry, &td->io_u_busylist) {
			io_u = flist_entry(entry, struct io_u, list);
			fov = (struct fio_overlapped*)io_u->engine_data;

			if (fov->io_complete) {
				fov->io_complete = FALSE;
				ResetEvent(fov->o.hEvent);
				wd->aio_events[dequeued] = io_u;
				dequeued++;
			}

			if (dequeued >= min)
				break;
		}

		if (dequeued < min) {
			status = WaitForSingleObject(wd->iocomplete_event, mswait);
			if (status != WAIT_OBJECT_0 && dequeued >= min)
				break;
		}

		if (dequeued >= min || (t != NULL && timeout_expired(start_count, end_count)))
			break;
	} while (1);

	return dequeued;
}

static int fio_windowsaio_queue(struct thread_data *td, struct io_u *io_u)
{
	struct fio_overlapped *o = io_u->engine_data;
	LPOVERLAPPED lpOvl = &o->o;
	DWORD iobytes;
	BOOL success = FALSE;
	int rc = FIO_Q_COMPLETED;

	fio_ro_check(td, io_u);

	lpOvl->Internal = STATUS_PENDING;
	lpOvl->InternalHigh = 0;
	lpOvl->Offset = io_u->offset & 0xFFFFFFFF;
	lpOvl->OffsetHigh = io_u->offset >> 32;

	switch (io_u->ddir) {
	case DDIR_WRITE:
		success = WriteFile(io_u->file->hFile, io_u->xfer_buf, io_u->xfer_buflen, &iobytes, lpOvl);
		break;
	case DDIR_READ:
		success = ReadFile(io_u->file->hFile, io_u->xfer_buf, io_u->xfer_buflen, &iobytes, lpOvl);
		break;
	case DDIR_SYNC:
	case DDIR_DATASYNC:
	case DDIR_SYNC_FILE_RANGE:
		success = FlushFileBuffers(io_u->file->hFile);
		if (!success) {
			log_err("windowsaio: failed to flush file buffers\n");
			io_u->error = win_to_posix_error(GetLastError());
		}

		return FIO_Q_COMPLETED;
		break;
	case DDIR_TRIM:
		log_err("windowsaio: manual TRIM isn't supported on Windows\n");
		io_u->error = 1;
		io_u->resid = io_u->xfer_buflen;
		return FIO_Q_COMPLETED;
		break;
	default:
		assert(0);
		break;
	}

	if (success || GetLastError() == ERROR_IO_PENDING)
		rc = FIO_Q_QUEUED;
	else {
		io_u->error = win_to_posix_error(GetLastError());
		io_u->resid = io_u->xfer_buflen;
	}

	return rc;
}

/* Runs as a thread and waits for queued IO to complete */
static DWORD WINAPI IoCompletionRoutine(LPVOID lpParameter)
{
	OVERLAPPED *ovl;
	struct fio_overlapped *fov;
	struct io_u *io_u;
	struct windowsaio_data *wd;
	struct thread_ctx *ctx;
	ULONG_PTR ulKey = 0;
	DWORD bytes;

	ctx = (struct thread_ctx*)lpParameter;
	wd = ctx->wd;

	do {
		if (!GetQueuedCompletionStatus(ctx->iocp, &bytes, &ulKey, &ovl, 250) && ovl == NULL)
			continue;

		fov = CONTAINING_RECORD(ovl, struct fio_overlapped, o);
		io_u = fov->io_u;

		if (ovl->Internal == ERROR_SUCCESS) {
			io_u->resid = io_u->xfer_buflen - ovl->InternalHigh;
			io_u->error = 0;
		} else {
			io_u->resid = io_u->xfer_buflen;
			io_u->error = win_to_posix_error(GetLastError());
		}

		fov->io_complete = TRUE;
		SetEvent(wd->iocomplete_event);
	} while (ctx->wd->iothread_running);

	CloseHandle(ctx->iocp);
	free(ctx);
	return 0;
}

static void fio_windowsaio_io_u_free(struct thread_data *td, struct io_u *io_u)
{
	struct fio_overlapped *o = io_u->engine_data;

	if (o) {
		CloseHandle(o->o.hEvent);
		io_u->engine_data = NULL;
		free(o);
	}
}

static int fio_windowsaio_io_u_init(struct thread_data *td, struct io_u *io_u)
{
	struct fio_overlapped *o;

	o = malloc(sizeof(*o));
	o->io_complete = FALSE;
	o->io_u = io_u;
	o->o.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
	if (o->o.hEvent == NULL) {
		log_err("windowsaio: failed to create event handle\n");
		free(o);
		return 1;
	}

	io_u->engine_data = o;
	return 0;
}

static struct ioengine_ops ioengine = {
	.name		= "windowsaio",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_windowsaio_init,
	.queue		= fio_windowsaio_queue,
	.getevents	= fio_windowsaio_getevents,
	.event		= fio_windowsaio_event,
	.cleanup	= fio_windowsaio_cleanup,
	.open_file	= fio_windowsaio_open_file,
	.close_file	= fio_windowsaio_close_file,
	.get_file_size	= generic_get_file_size,
	.io_u_init	= fio_windowsaio_io_u_init,
	.io_u_free	= fio_windowsaio_io_u_free,
};

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

static void fio_exit fio_windowsaio_unregister(void)
{
	unregister_ioengine(&ioengine);
}
Commit	Line	Data
	1	/*
	2	* windowsaio engine
	3	*
	4	* IO engine using Windows IO Completion Ports.
	5	*/
	6
	7	#include <stdio.h>
	8	#include <stdlib.h>
	9	#include <unistd.h>
	10	#include <signal.h>
	11	#include <errno.h>
	12	#include <windows.h>
	13
	14	#include "../fio.h"
	15
	16	typedef BOOL (WINAPI *CANCELIOEX)(HANDLE hFile, LPOVERLAPPED lpOverlapped);
	17
	18	int geterrno_from_win_error (DWORD code, int deferrno);
	19
	20	struct fio_overlapped {
	21	OVERLAPPED o;
	22	struct io_u *io_u;
	23	BOOL io_complete;
	24	};
	25
	26	struct windowsaio_data {
	27	struct io_u **aio_events;
	28	HANDLE iocp;
	29	HANDLE iothread;
	30	HANDLE iocomplete_event;
	31	BOOL iothread_running;
	32	};
	33
	34	struct thread_ctx {
	35	HANDLE iocp;
	36	struct windowsaio_data *wd;
	37	};
	38
	39	static BOOL timeout_expired(DWORD start_count, DWORD end_count);
	40	static int fio_windowsaio_getevents(struct thread_data *td, unsigned int min,
	41	unsigned int max, struct timespec *t);
	42	static struct io_u fio_windowsaio_event(struct thread_data td, int event);
	43	static int fio_windowsaio_queue(struct thread_data *td,
	44	struct io_u *io_u);
	45	static void fio_windowsaio_cleanup(struct thread_data *td);
	46	static DWORD WINAPI IoCompletionRoutine(LPVOID lpParameter);
	47	static int fio_windowsaio_init(struct thread_data *td);
	48	static int fio_windowsaio_open_file(struct thread_data td, struct fio_file f);
	49	static int fio_windowsaio_close_file(struct thread_data fio_unused td, struct fio_file f);
	50
	51	static int fio_windowsaio_init(struct thread_data *td)
	52	{
	53	struct windowsaio_data *wd;
	54	int rc = 0;
	55
	56	wd = calloc(1, sizeof(struct windowsaio_data));
	57	if (wd == NULL) {
	58	log_err("windowsaio: failed to allocate memory for engine data\n");
	59	rc = 1;
	60	}
	61
	62	if (!rc) {
	63	wd->aio_events = malloc(td->o.iodepth * sizeof(struct io_u*));
	64	if (wd->aio_events == NULL) {
	65	log_err("windowsaio: failed to allocate memory for aio events list\n");
	66	rc = 1;
	67	}
	68	}
	69
	70	if (!rc) {
	71	/* Create an auto-reset event */
	72	wd->iocomplete_event = CreateEvent(NULL, FALSE, FALSE, NULL);
	73	if (wd->iocomplete_event == NULL) {
	74	log_err("windowsaio: failed to create io complete event handle\n");
	75	rc = 1;
	76	}
	77	}
	78
	79	if (rc) {
	80	if (wd != NULL) {
	81	if (wd->aio_events != NULL)
	82	free(wd->aio_events);
	83
	84	free(wd);
	85	}
	86	}
	87
	88	td->io_ops->data = wd;
	89
	90	if (!rc) {
	91	struct thread_ctx *ctx;
	92	struct windowsaio_data *wd;
	93	HANDLE hFile;
	94
	95	hFile = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 0);
	96	if (hFile == INVALID_HANDLE_VALUE) {
	97	log_err("windowsaio: failed to create io completion port\n");
	98	rc = 1;
	99	}
	100
	101	wd = td->io_ops->data;
	102	wd->iothread_running = TRUE;
	103	wd->iocp = hFile;
	104
	105	if (!rc)
	106	ctx = malloc(sizeof(struct thread_ctx));
	107
	108	if (!rc && ctx == NULL)
	109	{
	110	log_err("windowsaio: failed to allocate memory for thread context structure\n");
	111	CloseHandle(hFile);
	112	rc = 1;
	113	}
	114
	115	if (!rc)
	116	{
	117	ctx->iocp = hFile;
	118	ctx->wd = wd;
	119	wd->iothread = CreateThread(NULL, 0, IoCompletionRoutine, ctx, 0, NULL);
	120	if (wd->iothread == NULL)
	121	log_err("windowsaio: failed to create io completion thread\n");
	122	}
	123
	124	if (rc \|\| wd->iothread == NULL)
	125	rc = 1;
	126	}
	127
	128	return rc;
	129	}
	130
	131	static void fio_windowsaio_cleanup(struct thread_data *td)
	132	{
	133	struct windowsaio_data *wd;
	134
	135	wd = td->io_ops->data;
	136
	137	if (wd != NULL) {
	138	wd->iothread_running = FALSE;
	139	WaitForSingleObject(wd->iothread, INFINITE);
	140
	141	CloseHandle(wd->iothread);
	142	CloseHandle(wd->iocomplete_event);
	143
	144	free(wd->aio_events);
	145	free(wd);
	146
	147	td->io_ops->data = NULL;
	148	}
	149	}
	150
	151
	152	static int fio_windowsaio_open_file(struct thread_data td, struct fio_file f)
	153	{
	154	int rc = 0;
	155	DWORD flags = FILE_FLAG_POSIX_SEMANTICS \| FILE_FLAG_OVERLAPPED;
	156	DWORD sharemode = FILE_SHARE_READ \| FILE_SHARE_WRITE;
	157	DWORD openmode = OPEN_ALWAYS;
	158	DWORD access;
	159
	160	dprint(FD_FILE, "fd open %s\n", f->file_name);
	161
	162	if (f->filetype == FIO_TYPE_PIPE) {
	163	log_err("windowsaio: pipes are not supported\n");
	164	return 1;
	165	}
	166
	167	if (!strcmp(f->file_name, "-")) {
	168	log_err("windowsaio: can't read/write to stdin/out\n");
	169	return 1;
	170	}
	171
	172	if (td->o.odirect)
	173	flags \|= FILE_FLAG_NO_BUFFERING;
	174	if (td->o.sync_io)
	175	flags \|= FILE_FLAG_WRITE_THROUGH;
	176
	177	/*
	178	* Inform Windows whether we're going to be doing sequential or
	179	* random io so it can tune the Cache Manager
	180	*/
	181	if (td->o.td_ddir == TD_DDIR_READ \|\|
	182	td->o.td_ddir == TD_DDIR_WRITE)
	183	flags \|= FILE_FLAG_SEQUENTIAL_SCAN;
	184	else
	185	flags \|= FILE_FLAG_RANDOM_ACCESS;
	186
	187	if (!td_write(td) \|\| read_only)
	188	access = GENERIC_READ;
	189	else
	190	access = (GENERIC_READ \| GENERIC_WRITE);
	191
	192	if (td->o.create_on_open)
	193	openmode = OPEN_ALWAYS;
	194	else
	195	openmode = OPEN_EXISTING;
	196
	197	f->hFile = CreateFile(f->file_name, access, sharemode,
	198	NULL, openmode, flags, NULL);
	199
	200	if (f->hFile == INVALID_HANDLE_VALUE) {
	201	log_err("windowsaio: failed to open file \"%s\"\n", f->file_name);
	202	rc = 1;
	203	}
	204
	205	/* Only set up the completion port and thread if we're not just
	206	* querying the device size */
	207	if (!rc && td->io_ops->data != NULL) {
	208	struct windowsaio_data *wd;
	209
	210	wd = td->io_ops->data;
	211
	212	if (CreateIoCompletionPort(f->hFile, wd->iocp, 0, 0) == NULL) {
	213	log_err("windowsaio: failed to create io completion port\n");
	214	rc = 1;
	215	}
	216	}
	217
	218	return rc;
	219	}
	220
	221	static int fio_windowsaio_close_file(struct thread_data fio_unused td, struct fio_file f)
	222	{
	223	int rc = 0;
	224
	225	dprint(FD_FILE, "fd close %s\n", f->file_name);
	226
	227	if (f->hFile != INVALID_HANDLE_VALUE) {
	228	if (!CloseHandle(f->hFile)) {
	229	log_info("windowsaio: failed to close file handle for \"%s\"\n", f->file_name);
	230	rc = 1;
	231	}
	232	}
	233
	234	f->hFile = INVALID_HANDLE_VALUE;
	235	return rc;
	236	}
	237
	238	static BOOL timeout_expired(DWORD start_count, DWORD end_count)
	239	{
	240	BOOL expired = FALSE;
	241	DWORD current_time;
	242
	243	current_time = GetTickCount();
	244
	245	if ((end_count > start_count) && current_time >= end_count)
	246	expired = TRUE;
	247	else if (current_time < start_count && current_time > end_count)
	248	expired = TRUE;
	249
	250	return expired;
	251	}
	252
	253	static struct io_u* fio_windowsaio_event(struct thread_data *td, int event)
	254	{
	255	struct windowsaio_data *wd = td->io_ops->data;
	256	return wd->aio_events[event];
	257	}
	258
	259	static int fio_windowsaio_getevents(struct thread_data *td, unsigned int min,
	260	unsigned int max, struct timespec *t)
	261	{
	262	struct windowsaio_data *wd = td->io_ops->data;
	263	struct flist_head *entry;
	264	unsigned int dequeued = 0;
	265	struct io_u *io_u;
	266	struct fio_overlapped *fov;
	267	DWORD start_count = 0;
	268	DWORD end_count = 0;
	269	DWORD status;
	270	DWORD mswait = 250;
	271
	272	if (t != NULL) {
	273	mswait = (t->tv_sec * 1000) + (t->tv_nsec / 1000000);
	274	start_count = GetTickCount();
	275	end_count = start_count + (t->tv_sec * 1000) + (t->tv_nsec / 1000000);
	276	}
	277
	278	do {
	279	flist_for_each(entry, &td->io_u_busylist) {
	280	io_u = flist_entry(entry, struct io_u, list);
	281	fov = (struct fio_overlapped*)io_u->engine_data;
	282
	283	if (fov->io_complete) {
	284	fov->io_complete = FALSE;
	285	ResetEvent(fov->o.hEvent);
	286	wd->aio_events[dequeued] = io_u;
	287	dequeued++;
	288	}
	289
	290	if (dequeued >= min)
	291	break;
	292	}
	293
	294	if (dequeued < min) {
	295	status = WaitForSingleObject(wd->iocomplete_event, mswait);
	296	if (status != WAIT_OBJECT_0 && dequeued >= min)
	297	break;
	298	}
	299
	300	if (dequeued >= min \|\| (t != NULL && timeout_expired(start_count, end_count)))
	301	break;
	302	} while (1);
	303
	304	return dequeued;
	305	}
	306
	307	static int fio_windowsaio_queue(struct thread_data td, struct io_u io_u)
	308	{
	309	struct fio_overlapped *o = io_u->engine_data;
	310	LPOVERLAPPED lpOvl = &o->o;
	311	DWORD iobytes;
	312	BOOL success = FALSE;
	313	int rc = FIO_Q_COMPLETED;
	314
	315	fio_ro_check(td, io_u);
	316
	317	lpOvl->Internal = STATUS_PENDING;
	318	lpOvl->InternalHigh = 0;
	319	lpOvl->Offset = io_u->offset & 0xFFFFFFFF;
	320	lpOvl->OffsetHigh = io_u->offset >> 32;
	321
	322	switch (io_u->ddir) {
	323	case DDIR_WRITE:
	324	success = WriteFile(io_u->file->hFile, io_u->xfer_buf, io_u->xfer_buflen, &iobytes, lpOvl);
	325	break;
	326	case DDIR_READ:
	327	success = ReadFile(io_u->file->hFile, io_u->xfer_buf, io_u->xfer_buflen, &iobytes, lpOvl);
	328	break;
	329	case DDIR_SYNC:
	330	case DDIR_DATASYNC:
	331	case DDIR_SYNC_FILE_RANGE:
	332	success = FlushFileBuffers(io_u->file->hFile);
	333	if (!success) {
	334	log_err("windowsaio: failed to flush file buffers\n");
	335	io_u->error = win_to_posix_error(GetLastError());
	336	}
	337
	338	return FIO_Q_COMPLETED;
	339	break;
	340	case DDIR_TRIM:
	341	log_err("windowsaio: manual TRIM isn't supported on Windows\n");
	342	io_u->error = 1;
	343	io_u->resid = io_u->xfer_buflen;
	344	return FIO_Q_COMPLETED;
	345	break;
	346	default:
	347	assert(0);
	348	break;
	349	}
	350
	351	if (success \|\| GetLastError() == ERROR_IO_PENDING)
	352	rc = FIO_Q_QUEUED;
	353	else {
	354	io_u->error = win_to_posix_error(GetLastError());
	355	io_u->resid = io_u->xfer_buflen;
	356	}
	357
	358	return rc;
	359	}
	360
	361	/* Runs as a thread and waits for queued IO to complete */
	362	static DWORD WINAPI IoCompletionRoutine(LPVOID lpParameter)
	363	{
	364	OVERLAPPED *ovl;
	365	struct fio_overlapped *fov;
	366	struct io_u *io_u;
	367	struct windowsaio_data *wd;
	368	struct thread_ctx *ctx;
	369	ULONG_PTR ulKey = 0;
	370	DWORD bytes;
	371
	372	ctx = (struct thread_ctx*)lpParameter;
	373	wd = ctx->wd;
	374
	375	do {
	376	if (!GetQueuedCompletionStatus(ctx->iocp, &bytes, &ulKey, &ovl, 250) && ovl == NULL)
	377	continue;
	378
	379	fov = CONTAINING_RECORD(ovl, struct fio_overlapped, o);
	380	io_u = fov->io_u;
	381
	382	if (ovl->Internal == ERROR_SUCCESS) {
	383	io_u->resid = io_u->xfer_buflen - ovl->InternalHigh;
	384	io_u->error = 0;
	385	} else {
	386	io_u->resid = io_u->xfer_buflen;
	387	io_u->error = win_to_posix_error(GetLastError());
	388	}
	389
	390	fov->io_complete = TRUE;
	391	SetEvent(wd->iocomplete_event);
	392	} while (ctx->wd->iothread_running);
	393
	394	CloseHandle(ctx->iocp);
	395	free(ctx);
	396	return 0;
	397	}
	398
	399	static void fio_windowsaio_io_u_free(struct thread_data td, struct io_u io_u)
	400	{
	401	struct fio_overlapped *o = io_u->engine_data;
	402
	403	if (o) {
	404	CloseHandle(o->o.hEvent);
	405	io_u->engine_data = NULL;
	406	free(o);
	407	}
	408	}
	409
	410	static int fio_windowsaio_io_u_init(struct thread_data td, struct io_u io_u)
	411	{
	412	struct fio_overlapped *o;
	413
	414	o = malloc(sizeof(*o));
	415	o->io_complete = FALSE;
	416	o->io_u = io_u;
	417	o->o.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
	418	if (o->o.hEvent == NULL) {
	419	log_err("windowsaio: failed to create event handle\n");
	420	free(o);
	421	return 1;
	422	}
	423
	424	io_u->engine_data = o;
	425	return 0;
	426	}
	427
	428	static struct ioengine_ops ioengine = {
	429	.name = "windowsaio",
	430	.version = FIO_IOOPS_VERSION,
	431	.init = fio_windowsaio_init,
	432	.queue = fio_windowsaio_queue,
	433	.getevents = fio_windowsaio_getevents,
	434	.event = fio_windowsaio_event,
	435	.cleanup = fio_windowsaio_cleanup,
	436	.open_file = fio_windowsaio_open_file,
	437	.close_file = fio_windowsaio_close_file,
	438	.get_file_size = generic_get_file_size,
	439	.io_u_init = fio_windowsaio_io_u_init,
	440	.io_u_free = fio_windowsaio_io_u_free,
	441	};
	442
	443	static void fio_init fio_windowsaio_register(void)
	444	{
	445	register_ioengine(&ioengine);
	446	}
	447
	448	static void fio_exit fio_windowsaio_unregister(void)
	449	{
	450	unregister_ioengine(&ioengine);
	451	}