[fio.git] / io_u.c

#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <assert.h>

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

/*
 * The ->file_map[] contains a map of blocks we have or have not done io
 * to yet. Used to make sure we cover the entire range in a fair fashion.
 */
static int random_map_free(struct thread_data *td, struct fio_file *f,
			   unsigned long long block)
{
	unsigned int idx = RAND_MAP_IDX(td, f, block);
	unsigned int bit = RAND_MAP_BIT(td, f, block);

	return (f->file_map[idx] & (1UL << bit)) == 0;
}

/*
 * Mark a given offset as used in the map.
 */
static void mark_random_map(struct thread_data *td, struct fio_file *f,
			    struct io_u *io_u)
{
	unsigned int min_bs = td->rw_min_bs;
	unsigned long long block;
	unsigned int blocks;
	unsigned int nr_blocks;

	block = io_u->offset / (unsigned long long) min_bs;
	blocks = 0;
	nr_blocks = (io_u->buflen + min_bs - 1) / min_bs;

	while (blocks < nr_blocks) {
		unsigned int idx, bit;

		if (!random_map_free(td, f, block))
			break;

		idx = RAND_MAP_IDX(td, f, block);
		bit = RAND_MAP_BIT(td, f, block);

		assert(idx < f->num_maps);

		f->file_map[idx] |= (1UL << bit);
		block++;
		blocks++;
	}

	if ((blocks * min_bs) < io_u->buflen)
		io_u->buflen = blocks * min_bs;
}

/*
 * Return the next free block in the map.
 */
static int get_next_free_block(struct thread_data *td, struct fio_file *f,
			       unsigned long long *b)
{
	int i;

	i = f->last_free_lookup;
	*b = (i * BLOCKS_PER_MAP);
	while ((*b) * td->rw_min_bs < f->real_file_size) {
		if (f->file_map[i] != -1UL) {
			*b += ffz(f->file_map[i]);
			f->last_free_lookup = i;
			return 0;
		}

		*b += BLOCKS_PER_MAP;
		i++;
	}

	return 1;
}

/*
 * For random io, generate a random new block and see if it's used. Repeat
 * until we find a free one. For sequential io, just return the end of
 * the last io issued.
 */
static int get_next_offset(struct thread_data *td, struct fio_file *f,
			   struct io_u *io_u)
{
	const int ddir = io_u->ddir;
	unsigned long long b, rb;
	long r;

	if (!td->sequential) {
		unsigned long long max_blocks = f->file_size / td->min_bs[ddir];
		int loops = 5;

		do {
			r = os_random_long(&td->random_state);
			b = ((max_blocks - 1) * r / (unsigned long long) (RAND_MAX+1.0));
			if (td->norandommap)
				break;
			rb = b + (f->file_offset / td->min_bs[ddir]);
			loops--;
		} while (!random_map_free(td, f, rb) && loops);

		if (!loops) {
			if (get_next_free_block(td, f, &b))
				return 1;

			b += f->file_offset / td->min_bs[ddir];
		}
	} else
		b = f->last_pos / td->min_bs[ddir];

	io_u->offset = (b * td->min_bs[ddir]) + f->file_offset;
	if (io_u->offset > f->real_file_size)
		return 1;

	return 0;
}

static unsigned int get_next_buflen(struct thread_data *td, int ddir)
{
	unsigned int buflen;
	long r;

	if (td->min_bs[ddir] == td->max_bs[ddir])
		buflen = td->min_bs[ddir];
	else {
		r = os_random_long(&td->bsrange_state);
		buflen = (unsigned int) (1 + (double) (td->max_bs[ddir] - 1) * r / (RAND_MAX + 1.0));
		if (!td->bs_unaligned)
			buflen = (buflen + td->min_bs[ddir] - 1) & ~(td->min_bs[ddir] - 1);
	}

	if (buflen > td->io_size - td->this_io_bytes[ddir]) {
		/*
		 * if using direct/raw io, we may not be able to
		 * shrink the size. so just fail it.
		 */
		if (td->io_ops->flags & FIO_RAWIO)
			return 0;

		buflen = td->io_size - td->this_io_bytes[ddir];
	}

	return buflen;
}

/*
 * Return the data direction for the next io_u. If the job is a
 * mixed read/write workload, check the rwmix cycle and switch if
 * necessary.
 */
static enum fio_ddir get_rw_ddir(struct thread_data *td)
{
	if (td_rw(td)) {
		struct timeval now;
		unsigned long elapsed;

		fio_gettime(&now, NULL);
	 	elapsed = mtime_since_now(&td->rwmix_switch);

		/*
		 * Check if it's time to seed a new data direction.
		 */
		if (elapsed >= td->rwmixcycle) {
			unsigned int v;
			long r;

			r = os_random_long(&td->rwmix_state);
			v = 1 + (int) (100.0 * (r / (RAND_MAX + 1.0)));
			if (v < td->rwmixread)
				td->rwmix_ddir = DDIR_READ;
			else
				td->rwmix_ddir = DDIR_WRITE;
			memcpy(&td->rwmix_switch, &now, sizeof(now));
		}
		return td->rwmix_ddir;
	} else if (td_read(td))
		return DDIR_READ;
	else
		return DDIR_WRITE;
}

void put_io_u(struct thread_data *td, struct io_u *io_u)
{
	io_u->file = NULL;
	list_del(&io_u->list);
	list_add(&io_u->list, &td->io_u_freelist);
	td->cur_depth--;
}

static int fill_io_u(struct thread_data *td, struct fio_file *f,
		     struct io_u *io_u)
{
	/*
	 * If using an iolog, grab next piece if any available.
	 */
	if (td->read_iolog)
		return read_iolog_get(td, io_u);

	/*
	 * see if it's time to sync
	 */
	if (td->fsync_blocks && !(td->io_blocks[DDIR_WRITE] % td->fsync_blocks)
	    && should_fsync(td)) {
		io_u->ddir = DDIR_SYNC;
		io_u->file = f;
		return 0;
	}

	io_u->ddir = get_rw_ddir(td);

	/*
	 * No log, let the seq/rand engine retrieve the next buflen and
	 * position.
	 */
	io_u->buflen = get_next_buflen(td, io_u->ddir);
	if (io_u->buflen) {
		if (!get_next_offset(td, f, io_u)) {
			/*
			 * mark entry before potentially trimming io_u
			 */
			if (!td->read_iolog && !td->sequential &&
			    !td->norandommap)
				mark_random_map(td, f, io_u);

			/*
			 * If using a write iolog, store this entry.
			 */
			if (td->write_iolog_file)
				write_iolog_put(td, io_u);

			io_u->file = f;
			return 0;
		}
	}

	return 1;
}

static void io_u_mark_depth(struct thread_data *td)
{
	int index = 0;

	switch (td->cur_depth) {
	default:
		index++;
	case 32 ... 63:
		index++;
	case 16 ... 31:
		index++;
	case 8 ... 15:
		index++;
	case 4 ... 7:
		index++;
	case 2 ... 3:
		index++;
	case 1:
		break;
	}

	td->io_u_map[index]++;
	td->total_io_u++;
}

struct io_u *__get_io_u(struct thread_data *td)
{
	struct io_u *io_u = NULL;

	if (!queue_full(td)) {
		io_u = list_entry(td->io_u_freelist.next, struct io_u, list);

		io_u->buflen = 0;
		io_u->error = 0;
		io_u->resid = 0;
		list_del(&io_u->list);
		list_add(&io_u->list, &td->io_u_busylist);
		td->cur_depth++;
		io_u_mark_depth(td);
	}

	return io_u;
}

/*
 * Return an io_u to be processed. Gets a buflen and offset, sets direction,
 * etc. The returned io_u is fully ready to be prepped and submitted.
 */
struct io_u *get_io_u(struct thread_data *td, struct fio_file *f)
{
	struct io_u *io_u;

	io_u = __get_io_u(td);
	if (!io_u)
		return NULL;

	if (td->zone_bytes >= td->zone_size) {
		td->zone_bytes = 0;
		f->last_pos += td->zone_skip;
	}

	if (fill_io_u(td, f, io_u)) {
		put_io_u(td, io_u);
		return NULL;
	}

	if (io_u->buflen + io_u->offset > f->real_file_size) {
		if (td->io_ops->flags & FIO_RAWIO) {
			put_io_u(td, io_u);
			return NULL;
		}

		io_u->buflen = f->real_file_size - io_u->offset;
	}

	if (io_u->ddir != DDIR_SYNC) {
		if (!io_u->buflen) {
			put_io_u(td, io_u);
			return NULL;
		}

		f->last_pos += io_u->buflen;

		if (td->verify != VERIFY_NONE)
			populate_verify_io_u(td, io_u);
	}

	if (td_io_prep(td, io_u)) {
		put_io_u(td, io_u);
		return NULL;
	}

	/*
	 * Set io data pointers.
	 */
	io_u->xfer_buf = io_u->buf;
	io_u->xfer_buflen = io_u->buflen;

	fio_gettime(&io_u->start_time, NULL);
	return io_u;
}

void io_completed(struct thread_data *td, struct io_u *io_u,
		  struct io_completion_data *icd)
{
	unsigned long msec;

	if (io_u->ddir == DDIR_SYNC) {
		td->last_was_sync = 1;
		return;
	}

	td->last_was_sync = 0;

	if (!io_u->error) {
		unsigned int bytes = io_u->buflen - io_u->resid;
		const enum fio_ddir idx = io_u->ddir;

		td->io_blocks[idx]++;
		td->io_bytes[idx] += bytes;
		td->zone_bytes += bytes;
		td->this_io_bytes[idx] += bytes;

		io_u->file->last_completed_pos = io_u->offset + io_u->buflen;

		msec = mtime_since(&io_u->issue_time, &icd->time);

		add_clat_sample(td, idx, msec);
		add_bw_sample(td, idx, &icd->time);

		if ((td_rw(td) || td_write(td)) && idx == DDIR_WRITE)
			log_io_piece(td, io_u);

		icd->bytes_done[idx] += bytes;
	} else
		icd->error = io_u->error;
}

void ios_completed(struct thread_data *td, struct io_completion_data *icd)
{
	struct io_u *io_u;
	int i;

	fio_gettime(&icd->time, NULL);

	icd->error = 0;
	icd->bytes_done[0] = icd->bytes_done[1] = 0;

	for (i = 0; i < icd->nr; i++) {
		io_u = td->io_ops->event(td, i);

		io_completed(td, io_u, icd);
		put_io_u(td, io_u);
	}
}
Commit	Line	Data
10ba535a JA	1	#include <unistd.h>
	2	#include <fcntl.h>
	3	#include <string.h>
	4	#include <signal.h>
	5	#include <time.h>
	6	#include <assert.h>
	7
	8	#include "fio.h"
	9	#include "os.h"
	10
	11	/*
	12	* The ->file_map[] contains a map of blocks we have or have not done io
	13	* to yet. Used to make sure we cover the entire range in a fair fashion.
	14	*/
	15	static int random_map_free(struct thread_data td, struct fio_file f,
	16	unsigned long long block)
	17	{
	18	unsigned int idx = RAND_MAP_IDX(td, f, block);
	19	unsigned int bit = RAND_MAP_BIT(td, f, block);
	20
	21	return (f->file_map[idx] & (1UL << bit)) == 0;
	22	}
	23
df415585 JA	24	/*
	25	* Mark a given offset as used in the map.
	26	*/
	27	static void mark_random_map(struct thread_data td, struct fio_file f,
	28	struct io_u *io_u)
	29	{
afdbe580	30	unsigned int min_bs = td->rw_min_bs;
a00735e6 JA	31	unsigned long long block;
a00735e6 JA	32	unsigned int blocks;
c685b5b2	33	unsigned int nr_blocks;
df415585	34
a00735e6 JA	35	block = io_u->offset / (unsigned long long) min_bs;
a00735e6 JA	36	blocks = 0;
c685b5b2 JA	37	nr_blocks = (io_u->buflen + min_bs - 1) / min_bs;
	38
	39	while (blocks < nr_blocks) {
df415585 JA	40	unsigned int idx, bit;
	41
	42	if (!random_map_free(td, f, block))
	43	break;
	44
	45	idx = RAND_MAP_IDX(td, f, block);
	46	bit = RAND_MAP_BIT(td, f, block);
	47
	48	assert(idx < f->num_maps);
	49
	50	f->file_map[idx] \|= (1UL << bit);
	51	block++;
	52	blocks++;
	53	}
	54
a00735e6 JA	55	if ((blocks * min_bs) < io_u->buflen)
a00735e6 JA	56	io_u->buflen = blocks * min_bs;
df415585 JA	57	}
df415585 JA	58
10ba535a JA	59	/*
	60	* Return the next free block in the map.
	61	*/
	62	static int get_next_free_block(struct thread_data td, struct fio_file f,
	63	unsigned long long *b)
	64	{
	65	int i;
	66
c685b5b2 JA	67	i = f->last_free_lookup;
c685b5b2 JA	68	b = (i BLOCKS_PER_MAP);
ee88470c	69	while ((b) td->rw_min_bs < f->real_file_size) {
10ba535a JA	70	if (f->file_map[i] != -1UL) {
10ba535a JA	71	*b += ffz(f->file_map[i]);
c685b5b2	72	f->last_free_lookup = i;
10ba535a JA	73	return 0;
	74	}
	75
	76	*b += BLOCKS_PER_MAP;
	77	i++;
	78	}
	79
	80	return 1;
	81	}
	82
	83	/*
	84	* For random io, generate a random new block and see if it's used. Repeat
	85	* until we find a free one. For sequential io, just return the end of
	86	* the last io issued.
	87	*/
	88	static int get_next_offset(struct thread_data td, struct fio_file f,
c685b5b2	89	struct io_u *io_u)
10ba535a	90	{
c685b5b2	91	const int ddir = io_u->ddir;
10ba535a JA	92	unsigned long long b, rb;
	93	long r;
	94
	95	if (!td->sequential) {
f697125a	96	unsigned long long max_blocks = f->file_size / td->min_bs[ddir];
c685b5b2	97	int loops = 5;
10ba535a JA	98
	99	do {
	100	r = os_random_long(&td->random_state);
	101	b = ((max_blocks - 1) * r / (unsigned long long) (RAND_MAX+1.0));
bb8895e0 JA	102	if (td->norandommap)
bb8895e0 JA	103	break;
a00735e6	104	rb = b + (f->file_offset / td->min_bs[ddir]);
10ba535a JA	105	loops--;
	106	} while (!random_map_free(td, f, rb) && loops);
	107
	108	if (!loops) {
	109	if (get_next_free_block(td, f, &b))
	110	return 1;
c685b5b2 JA	111
c685b5b2 JA	112	b += f->file_offset / td->min_bs[ddir];
10ba535a JA	113	}
10ba535a JA	114	} else
a00735e6	115	b = f->last_pos / td->min_bs[ddir];
10ba535a	116
c685b5b2 JA	117	io_u->offset = (b * td->min_bs[ddir]) + f->file_offset;
c685b5b2 JA	118	if (io_u->offset > f->real_file_size)
10ba535a JA	119	return 1;
	120
	121	return 0;
	122	}
	123
a00735e6	124	static unsigned int get_next_buflen(struct thread_data *td, int ddir)
10ba535a JA	125	{
	126	unsigned int buflen;
	127	long r;
	128
a00735e6 JA	129	if (td->min_bs[ddir] == td->max_bs[ddir])
a00735e6 JA	130	buflen = td->min_bs[ddir];
10ba535a JA	131	else {
10ba535a JA	132	r = os_random_long(&td->bsrange_state);
1e97cce9	133	buflen = (unsigned int) (1 + (double) (td->max_bs[ddir] - 1) * r / (RAND_MAX + 1.0));
690adba3	134	if (!td->bs_unaligned)
a00735e6	135	buflen = (buflen + td->min_bs[ddir] - 1) & ~(td->min_bs[ddir] - 1);
10ba535a JA	136	}
10ba535a JA	137
a00735e6	138	if (buflen > td->io_size - td->this_io_bytes[ddir]) {
10ba535a JA	139	/*
	140	* if using direct/raw io, we may not be able to
	141	* shrink the size. so just fail it.
	142	*/
	143	if (td->io_ops->flags & FIO_RAWIO)
	144	return 0;
	145
a00735e6	146	buflen = td->io_size - td->this_io_bytes[ddir];
10ba535a JA	147	}
	148
	149	return buflen;
	150	}
	151
	152	/*
	153	* Return the data direction for the next io_u. If the job is a
	154	* mixed read/write workload, check the rwmix cycle and switch if
	155	* necessary.
	156	*/
1e97cce9	157	static enum fio_ddir get_rw_ddir(struct thread_data *td)
10ba535a JA	158	{
	159	if (td_rw(td)) {
	160	struct timeval now;
	161	unsigned long elapsed;
	162
02bcaa8c	163	fio_gettime(&now, NULL);
10ba535a JA	164	elapsed = mtime_since_now(&td->rwmix_switch);
	165
	166	/*
	167	* Check if it's time to seed a new data direction.
	168	*/
	169	if (elapsed >= td->rwmixcycle) {
	170	unsigned int v;
	171	long r;
	172
	173	r = os_random_long(&td->rwmix_state);
	174	v = 1 + (int) (100.0 * (r / (RAND_MAX + 1.0)));
	175	if (v < td->rwmixread)
	176	td->rwmix_ddir = DDIR_READ;
	177	else
	178	td->rwmix_ddir = DDIR_WRITE;
	179	memcpy(&td->rwmix_switch, &now, sizeof(now));
	180	}
	181	return td->rwmix_ddir;
	182	} else if (td_read(td))
	183	return DDIR_READ;
	184	else
	185	return DDIR_WRITE;
	186	}
	187
10ba535a JA	188	void put_io_u(struct thread_data td, struct io_u io_u)
	189	{
	190	io_u->file = NULL;
	191	list_del(&io_u->list);
	192	list_add(&io_u->list, &td->io_u_freelist);
	193	td->cur_depth--;
	194	}
	195
	196	static int fill_io_u(struct thread_data td, struct fio_file f,
	197	struct io_u *io_u)
	198	{
	199	/*
	200	* If using an iolog, grab next piece if any available.
	201	*/
	202	if (td->read_iolog)
	203	return read_iolog_get(td, io_u);
	204
87dc1ab1 JA	205	/*
	206	* see if it's time to sync
	207	*/
	208	if (td->fsync_blocks && !(td->io_blocks[DDIR_WRITE] % td->fsync_blocks)
	209	&& should_fsync(td)) {
	210	io_u->ddir = DDIR_SYNC;
	211	io_u->file = f;
	212	return 0;
	213	}
	214
a00735e6 JA	215	io_u->ddir = get_rw_ddir(td);
a00735e6 JA	216
10ba535a	217	/*
c685b5b2 JA	218	* No log, let the seq/rand engine retrieve the next buflen and
c685b5b2 JA	219	* position.
10ba535a	220	*/
c685b5b2 JA	221	io_u->buflen = get_next_buflen(td, io_u->ddir);
	222	if (io_u->buflen) {
	223	if (!get_next_offset(td, f, io_u)) {
	224	/*
	225	* mark entry before potentially trimming io_u
	226	*/
	227	if (!td->read_iolog && !td->sequential &&
	228	!td->norandommap)
	229	mark_random_map(td, f, io_u);
	230
10ba535a JA	231	/*
	232	* If using a write iolog, store this entry.
	233	*/
076efc7c	234	if (td->write_iolog_file)
10ba535a JA	235	write_iolog_put(td, io_u);
	236
	237	io_u->file = f;
	238	return 0;
	239	}
	240	}
	241
	242	return 1;
	243	}
	244
71619dc2 JA	245	static void io_u_mark_depth(struct thread_data *td)
	246	{
	247	int index = 0;
	248
	249	switch (td->cur_depth) {
	250	default:
	251	index++;
	252	case 32 ... 63:
	253	index++;
	254	case 16 ... 31:
	255	index++;
	256	case 8 ... 15:
	257	index++;
	258	case 4 ... 7:
	259	index++;
	260	case 2 ... 3:
	261	index++;
	262	case 1:
	263	break;
	264	}
	265
	266	td->io_u_map[index]++;
	267	td->total_io_u++;
	268	}
	269
10ba535a JA	270	struct io_u __get_io_u(struct thread_data td)
	271	{
	272	struct io_u *io_u = NULL;
	273
	274	if (!queue_full(td)) {
	275	io_u = list_entry(td->io_u_freelist.next, struct io_u, list);
	276
6040dabc	277	io_u->buflen = 0;
10ba535a JA	278	io_u->error = 0;
	279	io_u->resid = 0;
	280	list_del(&io_u->list);
	281	list_add(&io_u->list, &td->io_u_busylist);
	282	td->cur_depth++;
71619dc2	283	io_u_mark_depth(td);
10ba535a JA	284	}
	285
	286	return io_u;
	287	}
	288
	289	/*
	290	* Return an io_u to be processed. Gets a buflen and offset, sets direction,
	291	* etc. The returned io_u is fully ready to be prepped and submitted.
	292	*/
	293	struct io_u get_io_u(struct thread_data td, struct fio_file *f)
	294	{
	295	struct io_u *io_u;
	296
	297	io_u = __get_io_u(td);
	298	if (!io_u)
	299	return NULL;
	300
	301	if (td->zone_bytes >= td->zone_size) {
	302	td->zone_bytes = 0;
	303	f->last_pos += td->zone_skip;
	304	}
	305
	306	if (fill_io_u(td, f, io_u)) {
	307	put_io_u(td, io_u);
	308	return NULL;
	309	}
	310
ee88470c	311	if (io_u->buflen + io_u->offset > f->real_file_size) {
10ba535a JA	312	if (td->io_ops->flags & FIO_RAWIO) {
	313	put_io_u(td, io_u);
	314	return NULL;
	315	}
	316
ee88470c	317	io_u->buflen = f->real_file_size - io_u->offset;
10ba535a JA	318	}
10ba535a JA	319
87dc1ab1 JA	320	if (io_u->ddir != DDIR_SYNC) {
	321	if (!io_u->buflen) {
	322	put_io_u(td, io_u);
	323	return NULL;
	324	}
10ba535a	325
87dc1ab1	326	f->last_pos += io_u->buflen;
10ba535a	327
87dc1ab1 JA	328	if (td->verify != VERIFY_NONE)
	329	populate_verify_io_u(td, io_u);
	330	}
10ba535a JA	331
	332	if (td_io_prep(td, io_u)) {
	333	put_io_u(td, io_u);
	334	return NULL;
	335	}
	336
165faf16 JA	337	/*
	338	* Set io data pointers.
	339	*/
cec6b55d JA	340	io_u->xfer_buf = io_u->buf;
cec6b55d JA	341	io_u->xfer_buflen = io_u->buflen;
165faf16	342
02bcaa8c	343	fio_gettime(&io_u->start_time, NULL);
10ba535a JA	344	return io_u;
	345	}
	346
	347	void io_completed(struct thread_data td, struct io_u io_u,
	348	struct io_completion_data *icd)
	349	{
10ba535a JA	350	unsigned long msec;
10ba535a JA	351
87dc1ab1 JA	352	if (io_u->ddir == DDIR_SYNC) {
	353	td->last_was_sync = 1;
	354	return;
	355	}
	356
	357	td->last_was_sync = 0;
	358
10ba535a JA	359	if (!io_u->error) {
10ba535a JA	360	unsigned int bytes = io_u->buflen - io_u->resid;
1e97cce9	361	const enum fio_ddir idx = io_u->ddir;
10ba535a JA	362
	363	td->io_blocks[idx]++;
	364	td->io_bytes[idx] += bytes;
	365	td->zone_bytes += bytes;
	366	td->this_io_bytes[idx] += bytes;
	367
02bcaa8c JA	368	io_u->file->last_completed_pos = io_u->offset + io_u->buflen;
	369
	370	msec = mtime_since(&io_u->issue_time, &icd->time);
10ba535a JA	371
10ba535a JA	372	add_clat_sample(td, idx, msec);
02bcaa8c	373	add_bw_sample(td, idx, &icd->time);
10ba535a JA	374
	375	if ((td_rw(td) \|\| td_write(td)) && idx == DDIR_WRITE)
	376	log_io_piece(td, io_u);
	377
	378	icd->bytes_done[idx] += bytes;
	379	} else
	380	icd->error = io_u->error;
	381	}
	382
	383	void ios_completed(struct thread_data td, struct io_completion_data icd)
	384	{
	385	struct io_u *io_u;
	386	int i;
	387
02bcaa8c JA	388	fio_gettime(&icd->time, NULL);
02bcaa8c JA	389
10ba535a JA	390	icd->error = 0;
	391	icd->bytes_done[0] = icd->bytes_done[1] = 0;
	392
	393	for (i = 0; i < icd->nr; i++) {
	394	io_u = td->io_ops->event(td, i);
	395
	396	io_completed(td, io_u, icd);
	397	put_io_u(td, io_u);
	398	}
	399	}