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