[fio.git] / log.c

/*
 * Code related to writing an iolog of what a thread is doing, and to
 * later read that back and replay
 */
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "list.h"
#include "fio.h"

static const char iolog_ver2[] = "fio version 2 iolog";

void log_io_u(struct thread_data *td, struct io_u *io_u)
{
	const char *act[] = { "read", "write", "sync" };

	assert(io_u->ddir < 3);

	if (!td->o.write_iolog_file)
		return;

	fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name, act[io_u->ddir], io_u->offset, io_u->buflen);
}

void log_file(struct thread_data *td, struct fio_file *f,
	      enum file_log_act what)
{
	const char *act[] = { "add", "open", "close" };

	assert(what < 3);

	if (!td->o.write_iolog_file)
		return;

	fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
}

static void iolog_delay(struct thread_data *td, unsigned long delay)
{
	unsigned long usec = utime_since_now(&td->last_issue);

	if (delay < usec)
		return;

	delay -= usec;

	/*
	 * less than 100 usec delay, just regard it as noise
	 */
	if (delay < 100)
		return;

	usec_sleep(td, delay);
}

int read_iolog_get(struct thread_data *td, struct io_u *io_u)
{
	struct io_piece *ipo;

restart:
	if (!list_empty(&td->io_log_list)) {
		ipo = list_entry(td->io_log_list.next, struct io_piece, list);
		list_del(&ipo->list);

		/*
		 * invalid ddir, this is a file action
		 */
		if (ipo->ddir == DDIR_INVAL) {
			struct fio_file *f = &td->files[ipo->fileno];

			if (ipo->file_action == FIO_LOG_OPEN_FILE) {
				assert(!td_io_open_file(td, f));
				free(ipo);
				goto restart;
			} else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
				td_io_close_file(td, f);
				free(ipo);
				goto restart;
			}
		}

		io_u->offset = ipo->offset;
		io_u->buflen = ipo->len;
		io_u->ddir = ipo->ddir;
		io_u->file = &td->files[ipo->fileno];
		get_file(io_u->file);

		if (ipo->delay)
			iolog_delay(td, ipo->delay);

		free(ipo);
		return 0;
	}

	return 1;
}

void prune_io_piece_log(struct thread_data *td)
{
	struct io_piece *ipo;
	struct rb_node *n;

	while ((n = rb_first(&td->io_hist_tree)) != NULL) {
		ipo = rb_entry(n, struct io_piece, rb_node);
		rb_erase(n, &td->io_hist_tree);
		free(ipo);
	}
}

/*
 * log a successful write, so we can unwind the log for verify
 */
void log_io_piece(struct thread_data *td, struct io_u *io_u)
{
	struct rb_node **p, *parent;
	struct io_piece *ipo, *__ipo;

	ipo = malloc(sizeof(struct io_piece));
	ipo->file = io_u->file;
	ipo->offset = io_u->offset;
	ipo->len = io_u->buflen;

	/*
	 * We don't need to sort the entries, if:
	 *
	 *	Sequential writes, or
	 *	Random writes that lay out the file as it goes along
	 *
	 * For both these cases, just reading back data in the order we
	 * wrote it out is the fastest.
	 */
	if (!td_random(td) || !td->o.overwrite ||
	     (io_u->file->flags & FIO_FILE_NOSORT)) {
		INIT_LIST_HEAD(&ipo->list);
		list_add_tail(&ipo->list, &td->io_hist_list);
		return;
	}

	RB_CLEAR_NODE(&ipo->rb_node);
	p = &td->io_hist_tree.rb_node;
	parent = NULL;

	/*
	 * Sort the entry into the verification list
	 */
	while (*p) {
		parent = *p;

		__ipo = rb_entry(parent, struct io_piece, rb_node);
		if (ipo->offset <= __ipo->offset)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&ipo->rb_node, parent, p);
	rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
}

void write_iolog_close(struct thread_data *td)
{
	fflush(td->iolog_f);
	fclose(td->iolog_f);
	free(td->iolog_buf);
	td->iolog_f = NULL;
	td->iolog_buf = NULL;
}

/*
 * Read version 2 iolog data. It is enhanced to include per-file logging,
 * syncs, etc.
 */
static int read_iolog2(struct thread_data *td, FILE *f)
{
	unsigned long long offset;
	unsigned int bytes;
	int rw, reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
	char *fname, *act;
	char *str, *p;

	free_release_files(td);

	/*
	 * Read in the read iolog and store it, reuse the infrastructure
	 * for doing verifications.
	 */
	str = malloc(4096);
	fname = malloc(256+16);
	act = malloc(256+16);

	reads = writes = 0;
	while ((p = fgets(str, 4096, f)) != NULL) {
		struct io_piece *ipo;
		int r;

		r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset, &bytes);
		if (r == 4) {
			/*
			 * Check action first
			 */
			if (!strcmp(act, "read"))
				rw = DDIR_READ;
			else if (!strcmp(act, "write"))
				rw = DDIR_WRITE;
			else if (!strcmp(act, "sync"))
				rw = DDIR_SYNC;
			else {
				log_err("fio: bad iolog file action: %s\n",act);
				continue;
			}
		} else if (r == 2) {
			rw = DDIR_INVAL;
			if (!strcmp(act, "add")) {
				td->o.nr_files++;
				fileno = add_file(td, fname);
				file_action = FIO_LOG_ADD_FILE;
				continue;
			} else if (!strcmp(act, "open")) {
				fileno = get_fileno(td, fname);
				file_action = FIO_LOG_OPEN_FILE;
			} else if (!strcmp(act, "close")) {
				fileno = get_fileno(td, fname);
				file_action = FIO_LOG_CLOSE_FILE;
			} else {
				log_err("fio: bad iolog file action: %s\n",act);
				continue;
			}
		} else {
			log_err("bad iolog2: %s", p);
			continue;
		}
			
		if (rw == DDIR_READ)
			reads++;
		else if (rw == DDIR_WRITE)
			writes++;
		else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
			log_err("bad ddir: %d\n", rw);
			continue;
		}

		/*
		 * Make note of file
		 */
		ipo = malloc(sizeof(*ipo));
		memset(ipo, 0, sizeof(*ipo));
		INIT_LIST_HEAD(&ipo->list);
		ipo->offset = offset;
		ipo->len = bytes;
		ipo->ddir = (enum fio_ddir) rw;
		if (bytes > td->o.max_bs[rw])
			td->o.max_bs[rw] = bytes;
		if (rw == DDIR_INVAL) {
			ipo->fileno = fileno;
			ipo->file_action = file_action;
		}
		list_add_tail(&ipo->list, &td->io_log_list);
	}

	free(str);
	free(act);
	free(fname);

	if (!reads && !writes)
		return 1;
	else if (reads && !writes)
		td->o.td_ddir = TD_DDIR_READ;
	else if (!reads && writes)
		td->o.td_ddir = TD_DDIR_WRITE;
	else
		td->o.td_ddir = TD_DDIR_RW;

	return 0;
}

/*
 * Read version 1 iolog data.
 */
static int read_iolog(struct thread_data *td, FILE *f)
{
	unsigned long long offset;
	unsigned int bytes;
	char *str, *p;
	int rw, reads, writes;

	/*
	 * Read in the read iolog and store it, reuse the infrastructure
	 * for doing verifications.
	 */
	str = malloc(4096);
	reads = writes = 0;
	while ((p = fgets(str, 4096, f)) != NULL) {
		struct io_piece *ipo;

		if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
			log_err("bad iolog: %s\n", p);
			continue;
		}
		if (rw == DDIR_READ)
			reads++;
		else if (rw == DDIR_WRITE)
			writes++;
		else if (rw != DDIR_SYNC) {
			log_err("bad ddir: %d\n", rw);
			continue;
		}

		ipo = malloc(sizeof(*ipo));
		memset(ipo, 0, sizeof(*ipo));
		INIT_LIST_HEAD(&ipo->list);
		ipo->offset = offset;
		ipo->len = bytes;
		ipo->ddir = (enum fio_ddir) rw;
		if (bytes > td->o.max_bs[rw])
			td->o.max_bs[rw] = bytes;
		list_add_tail(&ipo->list, &td->io_log_list);
	}

	free(str);

	if (!reads && !writes)
		return 1;
	else if (reads && !writes)
		td->o.td_ddir = TD_DDIR_READ;
	else if (!reads && writes)
		td->o.td_ddir = TD_DDIR_WRITE;
	else
		td->o.td_ddir = TD_DDIR_RW;

	return 0;
}

/*
 * open iolog, check version, and call appropriate parser
 */
static int init_iolog_read(struct thread_data *td)
{
	char buffer[256], *p;
	FILE *f;
	int ret;

	f = fopen(td->o.read_iolog_file, "r");
	if (!f) {
		perror("fopen read iolog");
		return 1;
	}

	p = fgets(buffer, sizeof(buffer), f);
	if (!p) {
		td_verror(td, errno, "iolog read");
		log_err("fio: unable to read iolog\n");
		return 1;
	}

	/*
	 * version 2 of the iolog stores a specific string as the
	 * first line, check for that
	 */
	if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
		ret = read_iolog2(td, f);
	else {
		/*
		 * seek back to the beginning
		 */
		if (fseek(f, 0, SEEK_SET) < 0) {
			td_verror(td, errno, "iolog read");
			log_err("fio: unable to read iolog\n");
			return 1;
		}

		ret = read_iolog(td, f);
	}

	fclose(f);
	return ret;
}

/*
 * Setup a log for storing io patterns.
 */
static int init_iolog_write(struct thread_data *td)
{
	struct fio_file *ff;
	FILE *f;
	unsigned int i;

	f = fopen(td->o.write_iolog_file, "w+");
	if (!f) {
		perror("fopen write iolog");
		return 1;
	}

	/*
	 * That's it for writing, setup a log buffer and we're done.
	  */
	td->iolog_f = f;
	td->iolog_buf = malloc(8192);
	setvbuf(f, td->iolog_buf, _IOFBF, 8192);

	/*
	 * write our version line
	 */
	if (fprintf(f, "%s\n", iolog_ver2) < 0) {
		perror("iolog init\n");
		return 1;
	}

	/*
	 * add all known files
	 */
	for_each_file(td, ff, i)
		log_file(td, ff, FIO_LOG_ADD_FILE);

	return 0;
}

int init_iolog(struct thread_data *td)
{
	int ret = 0;

	if (td->io_ops->flags & FIO_DISKLESSIO)
		return 0;

	if (td->o.read_iolog_file) {
		/*
		 * Check if it's a blktrace file and load that if possible.
		 * Otherwise assume it's a normal log file and load that.
		 */
		if (is_blktrace(td->o.read_iolog_file))
			ret = load_blktrace(td, td->o.read_iolog_file);
		else
			ret = init_iolog_read(td);
	} else if (td->o.write_iolog_file)
		ret = init_iolog_write(td);

	return ret;
}

void setup_log(struct io_log **log)
{
	struct io_log *l = malloc(sizeof(*l));

	l->nr_samples = 0;
	l->max_samples = 1024;
	l->log = malloc(l->max_samples * sizeof(struct io_sample));
	*log = l;
}

void __finish_log(struct io_log *log, const char *name)
{
	unsigned int i;
	FILE *f;

	f = fopen(name, "w");
	if (!f) {
		perror("fopen log");
		return;
	}

	for (i = 0; i < log->nr_samples; i++)
		fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val, log->log[i].ddir);

	fclose(f);
	free(log->log);
	free(log);
}

void finish_log(struct thread_data *td, struct io_log *log, const char *name)
{
	char file_name[256];

	snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
	__finish_log(log, file_name);
}
Commit	Line	Data
	1	/*
	2	* Code related to writing an iolog of what a thread is doing, and to
	3	* later read that back and replay
	4	*/
	5	#include <stdio.h>
	6	#include <stdlib.h>
	7	#include <assert.h>
	8	#include "list.h"
	9	#include "fio.h"
	10
	11	static const char iolog_ver2[] = "fio version 2 iolog";
	12
	13	void log_io_u(struct thread_data td, struct io_u io_u)
	14	{
	15	const char *act[] = { "read", "write", "sync" };
	16
	17	assert(io_u->ddir < 3);
	18
	19	if (!td->o.write_iolog_file)
	20	return;
	21
	22	fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name, act[io_u->ddir], io_u->offset, io_u->buflen);
	23	}
	24
	25	void log_file(struct thread_data td, struct fio_file f,
	26	enum file_log_act what)
	27	{
	28	const char *act[] = { "add", "open", "close" };
	29
	30	assert(what < 3);
	31
	32	if (!td->o.write_iolog_file)
	33	return;
	34
	35	fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
	36	}
	37
	38	static void iolog_delay(struct thread_data *td, unsigned long delay)
	39	{
	40	unsigned long usec = utime_since_now(&td->last_issue);
	41
	42	if (delay < usec)
	43	return;
	44
	45	delay -= usec;
	46
	47	/*
	48	* less than 100 usec delay, just regard it as noise
	49	*/
	50	if (delay < 100)
	51	return;
	52
	53	usec_sleep(td, delay);
	54	}
	55
	56	int read_iolog_get(struct thread_data td, struct io_u io_u)
	57	{
	58	struct io_piece *ipo;
	59
	60	restart:
	61	if (!list_empty(&td->io_log_list)) {
	62	ipo = list_entry(td->io_log_list.next, struct io_piece, list);
	63	list_del(&ipo->list);
	64
	65	/*
	66	* invalid ddir, this is a file action
	67	*/
	68	if (ipo->ddir == DDIR_INVAL) {
	69	struct fio_file *f = &td->files[ipo->fileno];
	70
	71	if (ipo->file_action == FIO_LOG_OPEN_FILE) {
	72	assert(!td_io_open_file(td, f));
	73	free(ipo);
	74	goto restart;
	75	} else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
	76	td_io_close_file(td, f);
	77	free(ipo);
	78	goto restart;
	79	}
	80	}
	81
	82	io_u->offset = ipo->offset;
	83	io_u->buflen = ipo->len;
	84	io_u->ddir = ipo->ddir;
	85	io_u->file = &td->files[ipo->fileno];
	86	get_file(io_u->file);
	87
	88	if (ipo->delay)
	89	iolog_delay(td, ipo->delay);
	90
	91	free(ipo);
	92	return 0;
	93	}
	94
	95	return 1;
	96	}
	97
	98	void prune_io_piece_log(struct thread_data *td)
	99	{
	100	struct io_piece *ipo;
	101	struct rb_node *n;
	102
	103	while ((n = rb_first(&td->io_hist_tree)) != NULL) {
	104	ipo = rb_entry(n, struct io_piece, rb_node);
	105	rb_erase(n, &td->io_hist_tree);
	106	free(ipo);
	107	}
	108	}
	109
	110	/*
	111	* log a successful write, so we can unwind the log for verify
	112	*/
	113	void log_io_piece(struct thread_data td, struct io_u io_u)
	114	{
	115	struct rb_node *p, parent;
	116	struct io_piece ipo, __ipo;
	117
	118	ipo = malloc(sizeof(struct io_piece));
	119	ipo->file = io_u->file;
	120	ipo->offset = io_u->offset;
	121	ipo->len = io_u->buflen;
	122
	123	/*
	124	* We don't need to sort the entries, if:
	125	*
	126	* Sequential writes, or
	127	* Random writes that lay out the file as it goes along
	128	*
	129	* For both these cases, just reading back data in the order we
	130	* wrote it out is the fastest.
	131	*/
	132	if (!td_random(td) \|\| !td->o.overwrite \|\|
	133	(io_u->file->flags & FIO_FILE_NOSORT)) {
	134	INIT_LIST_HEAD(&ipo->list);
	135	list_add_tail(&ipo->list, &td->io_hist_list);
	136	return;
	137	}
	138
	139	RB_CLEAR_NODE(&ipo->rb_node);
	140	p = &td->io_hist_tree.rb_node;
	141	parent = NULL;
	142
	143	/*
	144	* Sort the entry into the verification list
	145	*/
	146	while (*p) {
	147	parent = *p;
	148
	149	__ipo = rb_entry(parent, struct io_piece, rb_node);
	150	if (ipo->offset <= __ipo->offset)
	151	p = &(*p)->rb_left;
	152	else
	153	p = &(*p)->rb_right;
	154	}
	155
	156	rb_link_node(&ipo->rb_node, parent, p);
	157	rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
	158	}
	159
	160	void write_iolog_close(struct thread_data *td)
	161	{
	162	fflush(td->iolog_f);
	163	fclose(td->iolog_f);
	164	free(td->iolog_buf);
	165	td->iolog_f = NULL;
	166	td->iolog_buf = NULL;
	167	}
	168
	169	/*
	170	* Read version 2 iolog data. It is enhanced to include per-file logging,
	171	* syncs, etc.
	172	*/
	173	static int read_iolog2(struct thread_data td, FILE f)
	174	{
	175	unsigned long long offset;
	176	unsigned int bytes;
	177	int rw, reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
	178	char fname, act;
	179	char str, p;
	180
	181	free_release_files(td);
	182
	183	/*
	184	* Read in the read iolog and store it, reuse the infrastructure
	185	* for doing verifications.
	186	*/
	187	str = malloc(4096);
	188	fname = malloc(256+16);
	189	act = malloc(256+16);
	190
	191	reads = writes = 0;
	192	while ((p = fgets(str, 4096, f)) != NULL) {
	193	struct io_piece *ipo;
	194	int r;
	195
	196	r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset, &bytes);
	197	if (r == 4) {
	198	/*
	199	* Check action first
	200	*/
	201	if (!strcmp(act, "read"))
	202	rw = DDIR_READ;
	203	else if (!strcmp(act, "write"))
	204	rw = DDIR_WRITE;
	205	else if (!strcmp(act, "sync"))
	206	rw = DDIR_SYNC;
	207	else {
	208	log_err("fio: bad iolog file action: %s\n",act);
	209	continue;
	210	}
	211	} else if (r == 2) {
	212	rw = DDIR_INVAL;
	213	if (!strcmp(act, "add")) {
	214	td->o.nr_files++;
	215	fileno = add_file(td, fname);
	216	file_action = FIO_LOG_ADD_FILE;
	217	continue;
	218	} else if (!strcmp(act, "open")) {
	219	fileno = get_fileno(td, fname);
	220	file_action = FIO_LOG_OPEN_FILE;
	221	} else if (!strcmp(act, "close")) {
	222	fileno = get_fileno(td, fname);
	223	file_action = FIO_LOG_CLOSE_FILE;
	224	} else {
	225	log_err("fio: bad iolog file action: %s\n",act);
	226	continue;
	227	}
	228	} else {
	229	log_err("bad iolog2: %s", p);
	230	continue;
	231	}
	232
	233	if (rw == DDIR_READ)
	234	reads++;
	235	else if (rw == DDIR_WRITE)
	236	writes++;
	237	else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
	238	log_err("bad ddir: %d\n", rw);
	239	continue;
	240	}
	241
	242	/*
	243	* Make note of file
	244	*/
	245	ipo = malloc(sizeof(*ipo));
	246	memset(ipo, 0, sizeof(*ipo));
	247	INIT_LIST_HEAD(&ipo->list);
	248	ipo->offset = offset;
	249	ipo->len = bytes;
	250	ipo->ddir = (enum fio_ddir) rw;
	251	if (bytes > td->o.max_bs[rw])
	252	td->o.max_bs[rw] = bytes;
	253	if (rw == DDIR_INVAL) {
	254	ipo->fileno = fileno;
	255	ipo->file_action = file_action;
	256	}
	257	list_add_tail(&ipo->list, &td->io_log_list);
	258	}
	259
	260	free(str);
	261	free(act);
	262	free(fname);
	263
	264	if (!reads && !writes)
	265	return 1;
	266	else if (reads && !writes)
	267	td->o.td_ddir = TD_DDIR_READ;
	268	else if (!reads && writes)
	269	td->o.td_ddir = TD_DDIR_WRITE;
	270	else
	271	td->o.td_ddir = TD_DDIR_RW;
	272
	273	return 0;
	274	}
	275
	276	/*
	277	* Read version 1 iolog data.
	278	*/
	279	static int read_iolog(struct thread_data td, FILE f)
	280	{
	281	unsigned long long offset;
	282	unsigned int bytes;
	283	char str, p;
	284	int rw, reads, writes;
	285
	286	/*
	287	* Read in the read iolog and store it, reuse the infrastructure
	288	* for doing verifications.
	289	*/
	290	str = malloc(4096);
	291	reads = writes = 0;
	292	while ((p = fgets(str, 4096, f)) != NULL) {
	293	struct io_piece *ipo;
	294
	295	if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
	296	log_err("bad iolog: %s\n", p);
	297	continue;
	298	}
	299	if (rw == DDIR_READ)
	300	reads++;
	301	else if (rw == DDIR_WRITE)
	302	writes++;
	303	else if (rw != DDIR_SYNC) {
	304	log_err("bad ddir: %d\n", rw);
	305	continue;
	306	}
	307
	308	ipo = malloc(sizeof(*ipo));
	309	memset(ipo, 0, sizeof(*ipo));
	310	INIT_LIST_HEAD(&ipo->list);
	311	ipo->offset = offset;
	312	ipo->len = bytes;
	313	ipo->ddir = (enum fio_ddir) rw;
	314	if (bytes > td->o.max_bs[rw])
	315	td->o.max_bs[rw] = bytes;
	316	list_add_tail(&ipo->list, &td->io_log_list);
	317	}
	318
	319	free(str);
	320
	321	if (!reads && !writes)
	322	return 1;
	323	else if (reads && !writes)
	324	td->o.td_ddir = TD_DDIR_READ;
	325	else if (!reads && writes)
	326	td->o.td_ddir = TD_DDIR_WRITE;
	327	else
	328	td->o.td_ddir = TD_DDIR_RW;
	329
	330	return 0;
	331	}
	332
	333	/*
	334	* open iolog, check version, and call appropriate parser
	335	*/
	336	static int init_iolog_read(struct thread_data *td)
	337	{
	338	char buffer[256], *p;
	339	FILE *f;
	340	int ret;
	341
	342	f = fopen(td->o.read_iolog_file, "r");
	343	if (!f) {
	344	perror("fopen read iolog");
	345	return 1;
	346	}
	347
	348	p = fgets(buffer, sizeof(buffer), f);
	349	if (!p) {
	350	td_verror(td, errno, "iolog read");
	351	log_err("fio: unable to read iolog\n");
	352	return 1;
	353	}
	354
	355	/*
	356	* version 2 of the iolog stores a specific string as the
	357	* first line, check for that
	358	*/
	359	if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
	360	ret = read_iolog2(td, f);
	361	else {
	362	/*
	363	* seek back to the beginning
	364	*/
	365	if (fseek(f, 0, SEEK_SET) < 0) {
	366	td_verror(td, errno, "iolog read");
	367	log_err("fio: unable to read iolog\n");
	368	return 1;
	369	}
	370
	371	ret = read_iolog(td, f);
	372	}
	373
	374	fclose(f);
	375	return ret;
	376	}
	377
	378	/*
	379	* Setup a log for storing io patterns.
	380	*/
	381	static int init_iolog_write(struct thread_data *td)
	382	{
	383	struct fio_file *ff;
	384	FILE *f;
	385	unsigned int i;
	386
	387	f = fopen(td->o.write_iolog_file, "w+");
	388	if (!f) {
	389	perror("fopen write iolog");
	390	return 1;
	391	}
	392
	393	/*
	394	* That's it for writing, setup a log buffer and we're done.
	395	*/
	396	td->iolog_f = f;
	397	td->iolog_buf = malloc(8192);
	398	setvbuf(f, td->iolog_buf, _IOFBF, 8192);
	399
	400	/*
	401	* write our version line
	402	*/
	403	if (fprintf(f, "%s\n", iolog_ver2) < 0) {
	404	perror("iolog init\n");
	405	return 1;
	406	}
	407
	408	/*
	409	* add all known files
	410	*/
	411	for_each_file(td, ff, i)
	412	log_file(td, ff, FIO_LOG_ADD_FILE);
	413
	414	return 0;
	415	}
	416
	417	int init_iolog(struct thread_data *td)
	418	{
	419	int ret = 0;
	420
	421	if (td->io_ops->flags & FIO_DISKLESSIO)
	422	return 0;
	423
	424	if (td->o.read_iolog_file) {
	425	/*
	426	* Check if it's a blktrace file and load that if possible.
	427	* Otherwise assume it's a normal log file and load that.
	428	*/
	429	if (is_blktrace(td->o.read_iolog_file))
	430	ret = load_blktrace(td, td->o.read_iolog_file);
	431	else
	432	ret = init_iolog_read(td);
	433	} else if (td->o.write_iolog_file)
	434	ret = init_iolog_write(td);
	435
	436	return ret;
	437	}
	438
	439	void setup_log(struct io_log **log)
	440	{
	441	struct io_log l = malloc(sizeof(l));
	442
	443	l->nr_samples = 0;
	444	l->max_samples = 1024;
	445	l->log = malloc(l->max_samples * sizeof(struct io_sample));
	446	*log = l;
	447	}
	448
	449	void __finish_log(struct io_log log, const char name)
	450	{
	451	unsigned int i;
	452	FILE *f;
	453
	454	f = fopen(name, "w");
	455	if (!f) {
	456	perror("fopen log");
	457	return;
	458	}
	459
	460	for (i = 0; i < log->nr_samples; i++)
	461	fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val, log->log[i].ddir);
	462
	463	fclose(f);
	464	free(log->log);
	465	free(log);
	466	}
	467
	468	void finish_log(struct thread_data td, struct io_log log, const char *name)
	469	{
	470	char file_name[256];
	471
	472	snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
	473	__finish_log(log, file_name);
	474	}