[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 "../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 DWORD WINAPI IoCompletionRoutine(LPVOID lpParameter);

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)
		{
			DWORD threadid;

			ctx->iocp = hFile;
			ctx->wd = wd;
			wd->iothread = CreateThread(NULL, 0, IoCompletionRoutine, ctx, 0, &threadid);

			if (wd->iothread != NULL)
				fio_setaffinity(threadid, td->o.cpumask);
			else
				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,
				    const struct timespec *t)
{
	struct windowsaio_data *wd = td->io_ops_data;
	unsigned int dequeued = 0;
	struct io_u *io_u;
	int i;
	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 {
		io_u_qiter(&td->io_u_all, io_u, i) {
			if (!(io_u->flags & IO_U_F_FLIGHT))
				continue;

			fov = (struct fio_overlapped*)io_u->engine_data;

			if (fov->io_complete) {
				fov->io_complete = FALSE;
				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;
	BOOL success = FALSE;
	int rc = FIO_Q_COMPLETED;

	fio_ro_check(td, io_u);

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