[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;

	while (!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) {
				int ret;

				ret = td_io_open_file(td, f);
				if (!ret) {
					free(ipo);
					continue;
				}
				td_verror(td, ret, "iolog open file");
				return 1;
			} else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
				td_io_close_file(td, f);
				free(ipo);
				continue;
			}
		}

		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);

		dprint(FD_IO, "iolog: get %llu/%lu/%s\n", io_u->offset,
					io_u->buflen, io_u->file->file_name);

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

		free(ipo);
		return 0;
	}

	td->done = 1;
	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);
	}

	while (!list_empty(&td->io_hist_list)) {
		ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
		list_del(&ipo->list);
		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) {
		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 reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
	char *fname, *act;
	char *str, *p;
	enum fio_ddir rw;

	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) {
			/*
			 * Don't add a write for ro mode
			 */
			if (read_only)
				continue;
			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 = 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);
		td->total_io_size += bytes;
	}

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

	if (writes && read_only) {
		log_err("fio: <%s> skips replay of %d writes due to"
			" read-only\n", td->o.name, writes);
		writes = 0;
	}

	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 reads, writes;
	int rw;

	/*
	 * 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) {
			/*
			 * Don't add a write for ro mode
			 */
			if (read_only)
				continue;
			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);
		td->total_io_size += bytes;
	}

	free(str);

	if (writes && read_only) {
		log_err("fio: <%s> skips replay of %d writes due to"
			" read-only\n", td->o.name, writes);
		writes = 0;
	}

	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
f29b25a3 JA	1	/*
	2	* Code related to writing an iolog of what a thread is doing, and to
	3	* later read that back and replay
	4	*/
3c39a379 JA	5	#include <stdio.h>
3c39a379 JA	6	#include <stdlib.h>
f29b25a3	7	#include <assert.h>
3c39a379 JA	8	#include "list.h"
	9	#include "fio.h"
	10
f29b25a3 JA	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)
3c39a379	14	{
f29b25a3 JA	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
5ec10eaa JA	22	fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name,
	23	act[io_u->ddir], io_u->offset,
	24	io_u->buflen);
f29b25a3 JA	25	}
	26
	27	void log_file(struct thread_data td, struct fio_file f,
	28	enum file_log_act what)
	29	{
	30	const char *act[] = { "add", "open", "close" };
	31
	32	assert(what < 3);
	33
	34	if (!td->o.write_iolog_file)
	35	return;
	36
	37	fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
3c39a379 JA	38	}
3c39a379 JA	39
a61eddec JA	40	static void iolog_delay(struct thread_data *td, unsigned long delay)
	41	{
	42	unsigned long usec = utime_since_now(&td->last_issue);
	43
	44	if (delay < usec)
	45	return;
	46
	47	delay -= usec;
	48
	49	/*
	50	* less than 100 usec delay, just regard it as noise
	51	*/
	52	if (delay < 100)
	53	return;
	54
	55	usec_sleep(td, delay);
	56	}
	57
3c39a379 JA	58	int read_iolog_get(struct thread_data td, struct io_u io_u)
	59	{
	60	struct io_piece *ipo;
	61
b3f4b4f5	62	while (!list_empty(&td->io_log_list)) {
3c39a379 JA	63	ipo = list_entry(td->io_log_list.next, struct io_piece, list);
3c39a379 JA	64	list_del(&ipo->list);
a61eddec	65
f29b25a3 JA	66	/*
	67	* invalid ddir, this is a file action
	68	*/
429f6675	69	if (ipo->ddir == DDIR_INVAL) {
126d65c6	70	struct fio_file *f = td->files[ipo->fileno];
f29b25a3 JA	71
f29b25a3 JA	72	if (ipo->file_action == FIO_LOG_OPEN_FILE) {
ed4aa707 JA	73	int ret;
	74
	75	ret = td_io_open_file(td, f);
	76	if (!ret) {
	77	free(ipo);
	78	continue;
	79	}
	80	td_verror(td, ret, "iolog open file");
	81	return 1;
f29b25a3 JA	82	} else if (ipo->file_action == FIO_LOG_CLOSE_FILE) {
	83	td_io_close_file(td, f);
	84	free(ipo);
b3f4b4f5	85	continue;
f29b25a3 JA	86	}
	87	}
	88
429f6675 JA	89	io_u->offset = ipo->offset;
	90	io_u->buflen = ipo->len;
	91	io_u->ddir = ipo->ddir;
126d65c6	92	io_u->file = td->files[ipo->fileno];
429f6675 JA	93	get_file(io_u->file);
429f6675 JA	94
ee56ad50 JA	95	dprint(FD_IO, "iolog: get %llu/%lu/%s\n", io_u->offset,
	96	io_u->buflen, io_u->file->file_name);
	97
a61eddec JA	98	if (ipo->delay)
	99	iolog_delay(td, ipo->delay);
	100
3c39a379 JA	101	free(ipo);
	102	return 0;
	103	}
	104
20e354ef	105	td->done = 1;
3c39a379 JA	106	return 1;
	107	}
	108
	109	void prune_io_piece_log(struct thread_data *td)
	110	{
	111	struct io_piece *ipo;
4b87898e	112	struct rb_node *n;
3c39a379	113
4b87898e JA	114	while ((n = rb_first(&td->io_hist_tree)) != NULL) {
	115	ipo = rb_entry(n, struct io_piece, rb_node);
	116	rb_erase(n, &td->io_hist_tree);
3c39a379 JA	117	free(ipo);
3c39a379 JA	118	}
8ce9cd3d JA	119
	120	while (!list_empty(&td->io_hist_list)) {
	121	ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
	122	list_del(&ipo->list);
	123	free(ipo);
	124	}
3c39a379 JA	125	}
	126
	127	/*
34403fb1	128	* log a successful write, so we can unwind the log for verify
3c39a379 JA	129	*/
	130	void log_io_piece(struct thread_data td, struct io_u io_u)
	131	{
8de8f047	132	struct rb_node *p, parent;
4b87898e	133	struct io_piece ipo, __ipo;
3c39a379	134
4b87898e	135	ipo = malloc(sizeof(struct io_piece));
53cdc686	136	ipo->file = io_u->file;
3c39a379 JA	137	ipo->offset = io_u->offset;
	138	ipo->len = io_u->buflen;
	139
8de8f047 JA	140	/*
	141	* We don't need to sort the entries, if:
	142	*
	143	* Sequential writes, or
	144	* Random writes that lay out the file as it goes along
	145	*
	146	* For both these cases, just reading back data in the order we
	147	* wrote it out is the fastest.
	148	*/
9b23c9fb	149	if (!td_random(td) \|\| !td->o.overwrite) {
8de8f047 JA	150	INIT_LIST_HEAD(&ipo->list);
	151	list_add_tail(&ipo->list, &td->io_hist_list);
	152	return;
	153	}
	154
	155	RB_CLEAR_NODE(&ipo->rb_node);
	156	p = &td->io_hist_tree.rb_node;
	157	parent = NULL;
	158
3c39a379	159	/*
4b87898e	160	* Sort the entry into the verification list
3c39a379	161	*/
4b87898e JA	162	while (*p) {
	163	parent = *p;
	164
	165	__ipo = rb_entry(parent, struct io_piece, rb_node);
bb5d7d0b	166	if (ipo->offset <= __ipo->offset)
4b87898e	167	p = &(*p)->rb_left;
4b87898e	168	else
bb5d7d0b	169	p = &(*p)->rb_right;
3c39a379 JA	170	}
3c39a379 JA	171
4b87898e JA	172	rb_link_node(&ipo->rb_node, parent, p);
4b87898e JA	173	rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
3c39a379 JA	174	}
	175
	176	void write_iolog_close(struct thread_data *td)
	177	{
	178	fflush(td->iolog_f);
	179	fclose(td->iolog_f);
	180	free(td->iolog_buf);
f29b25a3 JA	181	td->iolog_f = NULL;
f29b25a3 JA	182	td->iolog_buf = NULL;
3c39a379 JA	183	}
3c39a379 JA	184
fb71fbd7	185	/*
f29b25a3 JA	186	* Read version 2 iolog data. It is enhanced to include per-file logging,
f29b25a3 JA	187	* syncs, etc.
fb71fbd7	188	*/
f29b25a3	189	static int read_iolog2(struct thread_data td, FILE f)
3c39a379 JA	190	{
	191	unsigned long long offset;
	192	unsigned int bytes;
53fa9b69	193	int reads, writes, fileno = 0, file_action = 0; /* stupid gcc */
f29b25a3	194	char fname, act;
3c39a379	195	char str, p;
53fa9b69	196	enum fio_ddir rw;
3c39a379	197
f29b25a3 JA	198	free_release_files(td);
	199
	200	/*
	201	* Read in the read iolog and store it, reuse the infrastructure
	202	* for doing verifications.
	203	*/
	204	str = malloc(4096);
	205	fname = malloc(256+16);
	206	act = malloc(256+16);
	207
	208	reads = writes = 0;
	209	while ((p = fgets(str, 4096, f)) != NULL) {
	210	struct io_piece *ipo;
	211	int r;
	212
5ec10eaa JA	213	r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset,
5ec10eaa JA	214	&bytes);
f29b25a3 JA	215	if (r == 4) {
	216	/*
	217	* Check action first
	218	*/
	219	if (!strcmp(act, "read"))
	220	rw = DDIR_READ;
	221	else if (!strcmp(act, "write"))
	222	rw = DDIR_WRITE;
	223	else if (!strcmp(act, "sync"))
	224	rw = DDIR_SYNC;
	225	else {
5ec10eaa JA	226	log_err("fio: bad iolog file action: %s\n",
5ec10eaa JA	227	act);
f29b25a3 JA	228	continue;
	229	}
	230	} else if (r == 2) {
	231	rw = DDIR_INVAL;
	232	if (!strcmp(act, "add")) {
	233	td->o.nr_files++;
	234	fileno = add_file(td, fname);
	235	file_action = FIO_LOG_ADD_FILE;
	236	continue;
	237	} else if (!strcmp(act, "open")) {
	238	fileno = get_fileno(td, fname);
	239	file_action = FIO_LOG_OPEN_FILE;
	240	} else if (!strcmp(act, "close")) {
	241	fileno = get_fileno(td, fname);
	242	file_action = FIO_LOG_CLOSE_FILE;
	243	} else {
5ec10eaa JA	244	log_err("fio: bad iolog file action: %s\n",
5ec10eaa JA	245	act);
f29b25a3 JA	246	continue;
	247	}
	248	} else {
	249	log_err("bad iolog2: %s", p);
	250	continue;
	251	}
5ec10eaa	252
f29b25a3 JA	253	if (rw == DDIR_READ)
f29b25a3 JA	254	reads++;
4241ea8f	255	else if (rw == DDIR_WRITE) {
4241ea8f JA	256	/*
	257	* Don't add a write for ro mode
	258	*/
	259	if (read_only)
	260	continue;
ed4aa707	261	writes++;
4241ea8f	262	} else if (rw != DDIR_SYNC && rw != DDIR_INVAL) {
f29b25a3 JA	263	log_err("bad ddir: %d\n", rw);
	264	continue;
	265	}
	266
	267	/*
	268	* Make note of file
	269	*/
	270	ipo = malloc(sizeof(*ipo));
	271	memset(ipo, 0, sizeof(*ipo));
	272	INIT_LIST_HEAD(&ipo->list);
	273	ipo->offset = offset;
	274	ipo->len = bytes;
53fa9b69	275	ipo->ddir = rw;
f29b25a3 JA	276	if (bytes > td->o.max_bs[rw])
	277	td->o.max_bs[rw] = bytes;
	278	if (rw == DDIR_INVAL) {
	279	ipo->fileno = fileno;
	280	ipo->file_action = file_action;
	281	}
	282	list_add_tail(&ipo->list, &td->io_log_list);
ea966f81	283	td->total_io_size += bytes;
3c39a379 JA	284	}
3c39a379 JA	285
f29b25a3 JA	286	free(str);
	287	free(act);
	288	free(fname);
	289
4241ea8f	290	if (writes && read_only) {
5ec10eaa JA	291	log_err("fio: <%s> skips replay of %d writes due to"
5ec10eaa JA	292	" read-only\n", td->o.name, writes);
4241ea8f JA	293	writes = 0;
	294	}
	295
f29b25a3 JA	296	if (!reads && !writes)
	297	return 1;
	298	else if (reads && !writes)
	299	td->o.td_ddir = TD_DDIR_READ;
	300	else if (!reads && writes)
	301	td->o.td_ddir = TD_DDIR_WRITE;
	302	else
	303	td->o.td_ddir = TD_DDIR_RW;
	304
	305	return 0;
	306	}
	307
	308	/*
	309	* Read version 1 iolog data.
	310	*/
	311	static int read_iolog(struct thread_data td, FILE f)
	312	{
	313	unsigned long long offset;
	314	unsigned int bytes;
	315	char str, p;
21bd2987	316	int reads, writes;
59b9ddfc	317	int rw;
f29b25a3	318
3c39a379 JA	319	/*
	320	* Read in the read iolog and store it, reuse the infrastructure
	321	* for doing verifications.
	322	*/
	323	str = malloc(4096);
fb71fbd7	324	reads = writes = 0;
3c39a379 JA	325	while ((p = fgets(str, 4096, f)) != NULL) {
	326	struct io_piece *ipo;
	327
	328	if (sscanf(p, "%d,%llu,%u", &rw, &offset, &bytes) != 3) {
3b70d7e5	329	log_err("bad iolog: %s\n", p);
3c39a379 JA	330	continue;
	331	}
	332	if (rw == DDIR_READ)
	333	reads++;
4241ea8f	334	else if (rw == DDIR_WRITE) {
4241ea8f JA	335	/*
	336	* Don't add a write for ro mode
	337	*/
	338	if (read_only)
	339	continue;
ed4aa707	340	writes++;
4241ea8f	341	} else if (rw != DDIR_SYNC) {
3b70d7e5	342	log_err("bad ddir: %d\n", rw);
3c39a379 JA	343	continue;
	344	}
	345
	346	ipo = malloc(sizeof(*ipo));
733ed597	347	memset(ipo, 0, sizeof(*ipo));
3c39a379 JA	348	INIT_LIST_HEAD(&ipo->list);
	349	ipo->offset = offset;
	350	ipo->len = bytes;
59b9ddfc	351	ipo->ddir = (enum fio_ddir) rw;
2dc1bbeb JA	352	if (bytes > td->o.max_bs[rw])
2dc1bbeb JA	353	td->o.max_bs[rw] = bytes;
3c39a379	354	list_add_tail(&ipo->list, &td->io_log_list);
ea966f81	355	td->total_io_size += bytes;
3c39a379 JA	356	}
	357
	358	free(str);
3c39a379	359
4241ea8f	360	if (writes && read_only) {
5ec10eaa JA	361	log_err("fio: <%s> skips replay of %d writes due to"
5ec10eaa JA	362	" read-only\n", td->o.name, writes);
4241ea8f JA	363	writes = 0;
	364	}
	365
fb71fbd7	366	if (!reads && !writes)
3c39a379	367	return 1;
fb71fbd7	368	else if (reads && !writes)
2dc1bbeb	369	td->o.td_ddir = TD_DDIR_READ;
3c39a379	370	else if (!reads && writes)
36361ebb	371	td->o.td_ddir = TD_DDIR_WRITE;
3c39a379	372	else
2dc1bbeb	373	td->o.td_ddir = TD_DDIR_RW;
3c39a379 JA	374
	375	return 0;
	376	}
8914a9d8	377
fb71fbd7	378	/*
f29b25a3	379	* open iolog, check version, and call appropriate parser
fb71fbd7	380	*/
f29b25a3	381	static int init_iolog_read(struct thread_data *td)
fb71fbd7	382	{
f29b25a3	383	char buffer[256], *p;
076efc7c	384	FILE *f;
f29b25a3 JA	385	int ret;
	386
	387	f = fopen(td->o.read_iolog_file, "r");
	388	if (!f) {
	389	perror("fopen read iolog");
	390	return 1;
	391	}
fb71fbd7	392
f29b25a3 JA	393	p = fgets(buffer, sizeof(buffer), f);
	394	if (!p) {
	395	td_verror(td, errno, "iolog read");
	396	log_err("fio: unable to read iolog\n");
733ed597 JA	397	return 1;
	398	}
	399
f29b25a3 JA	400	/*
	401	* version 2 of the iolog stores a specific string as the
	402	* first line, check for that
	403	*/
	404	if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
	405	ret = read_iolog2(td, f);
	406	else {
	407	/*
	408	* seek back to the beginning
	409	*/
	410	if (fseek(f, 0, SEEK_SET) < 0) {
	411	td_verror(td, errno, "iolog read");
	412	log_err("fio: unable to read iolog\n");
	413	return 1;
	414	}
	415
	416	ret = read_iolog(td, f);
	417	}
	418
	419	fclose(f);
	420	return ret;
	421	}
	422
	423	/*
	424	* Setup a log for storing io patterns.
	425	*/
	426	static int init_iolog_write(struct thread_data *td)
	427	{
	428	struct fio_file *ff;
	429	FILE *f;
	430	unsigned int i;
	431
2dc1bbeb	432	f = fopen(td->o.write_iolog_file, "w+");
fb71fbd7 JA	433	if (!f) {
	434	perror("fopen write iolog");
	435	return 1;
	436	}
	437
	438	/*
	439	* That's it for writing, setup a log buffer and we're done.
	440	*/
	441	td->iolog_f = f;
	442	td->iolog_buf = malloc(8192);
	443	setvbuf(f, td->iolog_buf, _IOFBF, 8192);
f29b25a3 JA	444
	445	/*
	446	* write our version line
	447	*/
	448	if (fprintf(f, "%s\n", iolog_ver2) < 0) {
	449	perror("iolog init\n");
	450	return 1;
	451	}
	452
	453	/*
	454	* add all known files
	455	*/
	456	for_each_file(td, ff, i)
	457	log_file(td, ff, FIO_LOG_ADD_FILE);
	458
fb71fbd7 JA	459	return 0;
	460	}
	461
	462	int init_iolog(struct thread_data *td)
	463	{
b4a6a59a JA	464	int ret = 0;
b4a6a59a JA	465
ba0fbe10	466	if (td->io_ops->flags & FIO_DISKLESSIO)
f48b467c JA	467	return 0;
f48b467c JA	468
fb7b71a3 JA	469	if (td->o.read_iolog_file) {
	470	/*
	471	* Check if it's a blktrace file and load that if possible.
	472	* Otherwise assume it's a normal log file and load that.
	473	*/
	474	if (is_blktrace(td->o.read_iolog_file))
	475	ret = load_blktrace(td, td->o.read_iolog_file);
	476	else
	477	ret = init_iolog_read(td);
	478	} else if (td->o.write_iolog_file)
b4a6a59a	479	ret = init_iolog_write(td);
fb71fbd7	480
1e97cce9	481	return ret;
fb71fbd7 JA	482	}
fb71fbd7 JA	483
8914a9d8 JA	484	void setup_log(struct io_log **log)
	485	{
	486	struct io_log l = malloc(sizeof(l));
	487
	488	l->nr_samples = 0;
	489	l->max_samples = 1024;
	490	l->log = malloc(l->max_samples * sizeof(struct io_sample));
	491	*log = l;
	492	}
	493
bb3884d8	494	void __finish_log(struct io_log log, const char name)
8914a9d8	495	{
8914a9d8	496	unsigned int i;
bb3884d8	497	FILE *f;
8914a9d8	498
bb3884d8	499	f = fopen(name, "w");
8914a9d8 JA	500	if (!f) {
	501	perror("fopen log");
	502	return;
	503	}
	504
5ec10eaa JA	505	for (i = 0; i < log->nr_samples; i++) {
	506	fprintf(f, "%lu, %lu, %u\n", log->log[i].time, log->log[i].val,
	507	log->log[i].ddir);
	508	}
8914a9d8 JA	509
	510	fclose(f);
	511	free(log->log);
	512	free(log);
	513	}
bb3884d8 JA	514
	515	void finish_log(struct thread_data td, struct io_log log, const char *name)
	516	{
	517	char file_name[256];
	518
	519	snprintf(file_name, 200, "client%d_%s.log", td->thread_number, name);
	520	__finish_log(log, file_name);
	521	}