[fio.git] / diskutil.c

#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <libgen.h>
#include <math.h>

#include "fio.h"

static int last_majdev, last_mindev;

static struct list_head disk_list = LIST_HEAD_INIT(disk_list);

static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
{
	unsigned in_flight;
	char line[256];
	FILE *f;
	char *p;
	int ret;

	dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);

	f = fopen(du->path, "r");
	if (!f)
		return 1;

	p = fgets(line, sizeof(line), f);
	if (!p) {
		fclose(f);
		return 1;
	}

	dprint(FD_DISKUTIL, "%s: %s", du->path, p);

	ret = sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n", &dus->ios[0],
					&dus->merges[0], &dus->sectors[0],
					&dus->ticks[0], &dus->ios[1],
					&dus->merges[1], &dus->sectors[1],
					&dus->ticks[1], &in_flight,
					&dus->io_ticks, &dus->time_in_queue);
	fclose(f);
	dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
	return ret != 11;
}

static void update_io_tick_disk(struct disk_util *du)
{
	struct disk_util_stat __dus, *dus, *ldus;
	struct timeval t;

	if (get_io_ticks(du, &__dus))
		return;

	dus = &du->dus;
	ldus = &du->last_dus;

	dus->sectors[0] += (__dus.sectors[0] - ldus->sectors[0]);
	dus->sectors[1] += (__dus.sectors[1] - ldus->sectors[1]);
	dus->ios[0] += (__dus.ios[0] - ldus->ios[0]);
	dus->ios[1] += (__dus.ios[1] - ldus->ios[1]);
	dus->merges[0] += (__dus.merges[0] - ldus->merges[0]);
	dus->merges[1] += (__dus.merges[1] - ldus->merges[1]);
	dus->ticks[0] += (__dus.ticks[0] - ldus->ticks[0]);
	dus->ticks[1] += (__dus.ticks[1] - ldus->ticks[1]);
	dus->io_ticks += (__dus.io_ticks - ldus->io_ticks);
	dus->time_in_queue += (__dus.time_in_queue - ldus->time_in_queue);

	fio_gettime(&t, NULL);
	du->msec += mtime_since(&du->time, &t);
	memcpy(&du->time, &t, sizeof(t));
	memcpy(ldus, &__dus, sizeof(__dus));
}

void update_io_ticks(void)
{
	struct list_head *entry;
	struct disk_util *du;

	dprint(FD_DISKUTIL, "update io ticks\n");

	list_for_each(entry, &disk_list) {
		du = list_entry(entry, struct disk_util, list);
		update_io_tick_disk(du);
	}
}

static struct disk_util *disk_util_exists(int major, int minor)
{
	struct list_head *entry;
	struct disk_util *du;

	list_for_each(entry, &disk_list) {
		du = list_entry(entry, struct disk_util, list);

		if (major == du->major && minor == du->minor)
			return du;
	}

	return NULL;
}

static void disk_util_add(int majdev, int mindev, char *path)
{
	struct disk_util *du, *__du;
	struct list_head *entry;

	dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);

	du = malloc(sizeof(*du));
	memset(du, 0, sizeof(*du));
	INIT_LIST_HEAD(&du->list);
	sprintf(du->path, "%s/stat", path);
	du->name = strdup(basename(path));
	du->sysfs_root = path;
	du->major = majdev;
	du->minor = mindev;

	list_for_each(entry, &disk_list) {
		__du = list_entry(entry, struct disk_util, list);

		dprint(FD_DISKUTIL, "found %s in list\n", __du->name);

		if (!strcmp(du->name, __du->name)) {
			free(du->name);
			free(du);
			return;
		}
	}

	dprint(FD_DISKUTIL, "add %s to list\n", du->name);

	fio_gettime(&du->time, NULL);
	get_io_ticks(du, &du->last_dus);

	list_add_tail(&du->list, &disk_list);
}

static int check_dev_match(int majdev, int mindev, char *path)
{
	int major, minor;
	char line[256], *p;
	FILE *f;

	f = fopen(path, "r");
	if (!f) {
		perror("open path");
		return 1;
	}

	p = fgets(line, sizeof(line), f);
	if (!p) {
		fclose(f);
		return 1;
	}

	if (sscanf(p, "%u:%u", &major, &minor) != 2) {
		fclose(f);
		return 1;
	}

	if (majdev == major && mindev == minor) {
		fclose(f);
		return 0;
	}

	fclose(f);
	return 1;
}

static int find_block_dir(int majdev, int mindev, char *path)
{
	struct dirent *dir;
	struct stat st;
	int found = 0;
	DIR *D;

	D = opendir(path);
	if (!D)
		return 0;

	while ((dir = readdir(D)) != NULL) {
		char full_path[256];

		if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
			continue;

		sprintf(full_path, "%s/%s", path, dir->d_name);

		if (!strcmp(dir->d_name, "dev")) {
			if (!check_dev_match(majdev, mindev, full_path)) {
				found = 1;
				break;
			}
		}

		if (lstat(full_path, &st) == -1) {
			perror("stat");
			break;
		}

		if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
			continue;

		found = find_block_dir(majdev, mindev, full_path);
		if (found) {
			strcpy(path, full_path);
			break;
		}
	}

	closedir(D);
	return found;
}

static void __init_disk_util(struct thread_data *td, struct fio_file *f)
{
	struct stat st;
	char foo[PATH_MAX], tmp[PATH_MAX];
	struct disk_util *du;
	int mindev, majdev;
	char *p;

	if (!lstat(f->file_name, &st)) {
		if (S_ISBLK(st.st_mode)) {
			majdev = major(st.st_rdev);
			mindev = minor(st.st_rdev);
		} else if (S_ISCHR(st.st_mode)) {
			majdev = major(st.st_rdev);
			mindev = minor(st.st_rdev);
			if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
				return;
		} else if (S_ISFIFO(st.st_mode))
			return;
		else {
			majdev = major(st.st_dev);
			mindev = minor(st.st_dev);
		}
	} else {
		/*
		 * must be a file, open "." in that path
		 */
		strncpy(foo, f->file_name, PATH_MAX - 1);
		p = dirname(foo);
		if (stat(p, &st)) {
			perror("disk util stat");
			return;
		}

		majdev = major(st.st_dev);
		mindev = minor(st.st_dev);
	}

	dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", f->file_name,
							majdev, mindev);

	du = disk_util_exists(majdev, mindev);
	if (du) {
		if (td->o.ioscheduler && !td->sysfs_root)
			td->sysfs_root = strdup(du->sysfs_root);

		return;
	}

	/*
	 * for an fs without a device, we will repeatedly stat through
	 * sysfs which can take oodles of time for thousands of files. so
	 * cache the last lookup and compare with that before going through
	 * everything again.
	 */
	if (mindev == last_mindev && majdev == last_majdev)
		return;

	last_mindev = mindev;
	last_majdev = majdev;

	sprintf(foo, "/sys/block");
	if (!find_block_dir(majdev, mindev, foo))
		return;

	/*
	 * If there's a ../queue/ directory there, we are inside a partition.
	 * Check if that is the case and jump back. For loop/md/dm etc we
	 * are already in the right spot.
	 */
	sprintf(tmp, "%s/../queue", foo);
	if (!stat(tmp, &st)) {
		p = dirname(foo);
		sprintf(tmp, "%s/queue", p);
		if (stat(tmp, &st)) {
			log_err("unknown sysfs layout\n");
			return;
		}
		strncpy(tmp, p, PATH_MAX - 1);
		sprintf(foo, "%s", tmp);
	}

	if (td->o.ioscheduler && !td->sysfs_root)
		td->sysfs_root = strdup(foo);

	disk_util_add(majdev, mindev, foo);
}

void init_disk_util(struct thread_data *td)
{
	struct fio_file *f;
	unsigned int i;

	if (!td->o.do_disk_util ||
	    (td->io_ops->flags & (FIO_DISKLESSIO | FIO_NODISKUTIL)))
		return;

	for_each_file(td, f, i)
		__init_disk_util(td, f);
}

void show_disk_util(void)
{
	struct disk_util_stat *dus;
	struct list_head *entry, *next;
	struct disk_util *du;
	double util;

	if (list_empty(&disk_list))
		return;

	log_info("\nDisk stats (read/write):\n");

	list_for_each(entry, &disk_list) {
		du = list_entry(entry, struct disk_util, list);
		dus = &du->dus;

		util = (double) 100 * du->dus.io_ticks / (double) du->msec;
		if (util > 100.0)
			util = 100.0;

		log_info("  %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, "
			 "in_queue=%u, util=%3.2f%%\n", du->name,
						dus->ios[0], dus->ios[1],
						dus->merges[0], dus->merges[1],
						dus->ticks[0], dus->ticks[1],
						dus->time_in_queue, util);
	}

	/*
	 * now free the list
	 */
	list_for_each_safe(entry, next, &disk_list) {
		list_del(entry);
		du = list_entry(entry, struct disk_util, list);
		free(du->name);
		free(du);
	}
}
Commit	Line	Data
9f8f2064 JA	1	#include <stdio.h>
	2	#include <string.h>
	3	#include <sys/time.h>
	4	#include <sys/types.h>
	5	#include <sys/stat.h>
	6	#include <dirent.h>
	7	#include <libgen.h>
	8	#include <math.h>
	9
	10	#include "fio.h"
	11
	12	static int last_majdev, last_mindev;
9f8f2064 JA	13
	14	static struct list_head disk_list = LIST_HEAD_INIT(disk_list);
	15
	16	static int get_io_ticks(struct disk_util du, struct disk_util_stat dus)
	17	{
	18	unsigned in_flight;
	19	char line[256];
	20	FILE *f;
	21	char *p;
5ec10eaa	22	int ret;
9f8f2064	23
cd991b9e JA	24	dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
cd991b9e JA	25
9f8f2064 JA	26	f = fopen(du->path, "r");
	27	if (!f)
	28	return 1;
	29
	30	p = fgets(line, sizeof(line), f);
	31	if (!p) {
	32	fclose(f);
	33	return 1;
	34	}
	35
cd991b9e JA	36	dprint(FD_DISKUTIL, "%s: %s", du->path, p);
	37
	38	ret = sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n", &dus->ios[0],
5ec10eaa JA	39	&dus->merges[0], &dus->sectors[0],
	40	&dus->ticks[0], &dus->ios[1],
	41	&dus->merges[1], &dus->sectors[1],
	42	&dus->ticks[1], &in_flight,
	43	&dus->io_ticks, &dus->time_in_queue);
9f8f2064	44	fclose(f);
cd991b9e JA	45	dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
cd991b9e JA	46	return ret != 11;
9f8f2064 JA	47	}
	48
	49	static void update_io_tick_disk(struct disk_util *du)
	50	{
	51	struct disk_util_stat __dus, dus, ldus;
	52	struct timeval t;
	53
	54	if (get_io_ticks(du, &__dus))
	55	return;
	56
	57	dus = &du->dus;
	58	ldus = &du->last_dus;
	59
	60	dus->sectors[0] += (__dus.sectors[0] - ldus->sectors[0]);
	61	dus->sectors[1] += (__dus.sectors[1] - ldus->sectors[1]);
	62	dus->ios[0] += (__dus.ios[0] - ldus->ios[0]);
	63	dus->ios[1] += (__dus.ios[1] - ldus->ios[1]);
	64	dus->merges[0] += (__dus.merges[0] - ldus->merges[0]);
	65	dus->merges[1] += (__dus.merges[1] - ldus->merges[1]);
	66	dus->ticks[0] += (__dus.ticks[0] - ldus->ticks[0]);
	67	dus->ticks[1] += (__dus.ticks[1] - ldus->ticks[1]);
	68	dus->io_ticks += (__dus.io_ticks - ldus->io_ticks);
	69	dus->time_in_queue += (__dus.time_in_queue - ldus->time_in_queue);
	70
	71	fio_gettime(&t, NULL);
	72	du->msec += mtime_since(&du->time, &t);
	73	memcpy(&du->time, &t, sizeof(t));
	74	memcpy(ldus, &__dus, sizeof(__dus));
	75	}
	76
	77	void update_io_ticks(void)
	78	{
	79	struct list_head *entry;
	80	struct disk_util *du;
	81
cd991b9e JA	82	dprint(FD_DISKUTIL, "update io ticks\n");
cd991b9e JA	83
9f8f2064 JA	84	list_for_each(entry, &disk_list) {
	85	du = list_entry(entry, struct disk_util, list);
	86	update_io_tick_disk(du);
	87	}
	88	}
	89
e11c410c	90	static struct disk_util *disk_util_exists(int major, int minor)
9f8f2064 JA	91	{
	92	struct list_head *entry;
	93	struct disk_util *du;
	94
	95	list_for_each(entry, &disk_list) {
	96	du = list_entry(entry, struct disk_util, list);
	97
	98	if (major == du->major && minor == du->minor)
e11c410c	99	return du;
9f8f2064 JA	100	}
9f8f2064 JA	101
e11c410c	102	return NULL;
9f8f2064 JA	103	}
	104
	105	static void disk_util_add(int majdev, int mindev, char *path)
	106	{
	107	struct disk_util du, __du;
	108	struct list_head *entry;
	109
cd991b9e JA	110	dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
cd991b9e JA	111
9f8f2064 JA	112	du = malloc(sizeof(*du));
	113	memset(du, 0, sizeof(*du));
	114	INIT_LIST_HEAD(&du->list);
	115	sprintf(du->path, "%s/stat", path);
	116	du->name = strdup(basename(path));
e11c410c	117	du->sysfs_root = path;
9f8f2064 JA	118	du->major = majdev;
	119	du->minor = mindev;
	120
	121	list_for_each(entry, &disk_list) {
	122	__du = list_entry(entry, struct disk_util, list);
	123
cd991b9e JA	124	dprint(FD_DISKUTIL, "found %s in list\n", __du->name);
cd991b9e JA	125
9f8f2064 JA	126	if (!strcmp(du->name, __du->name)) {
	127	free(du->name);
	128	free(du);
	129	return;
	130	}
	131	}
	132
cd991b9e JA	133	dprint(FD_DISKUTIL, "add %s to list\n", du->name);
cd991b9e JA	134
9f8f2064 JA	135	fio_gettime(&du->time, NULL);
	136	get_io_ticks(du, &du->last_dus);
	137
	138	list_add_tail(&du->list, &disk_list);
	139	}
	140
	141	static int check_dev_match(int majdev, int mindev, char *path)
	142	{
	143	int major, minor;
	144	char line[256], *p;
	145	FILE *f;
	146
	147	f = fopen(path, "r");
	148	if (!f) {
	149	perror("open path");
	150	return 1;
	151	}
	152
	153	p = fgets(line, sizeof(line), f);
	154	if (!p) {
	155	fclose(f);
	156	return 1;
	157	}
	158
	159	if (sscanf(p, "%u:%u", &major, &minor) != 2) {
	160	fclose(f);
	161	return 1;
	162	}
	163
	164	if (majdev == major && mindev == minor) {
	165	fclose(f);
	166	return 0;
	167	}
	168
	169	fclose(f);
	170	return 1;
	171	}
	172
	173	static int find_block_dir(int majdev, int mindev, char *path)
	174	{
	175	struct dirent *dir;
	176	struct stat st;
	177	int found = 0;
	178	DIR *D;
	179
	180	D = opendir(path);
	181	if (!D)
	182	return 0;
	183
	184	while ((dir = readdir(D)) != NULL) {
	185	char full_path[256];
	186
	187	if (!strcmp(dir->d_name, ".") \|\| !strcmp(dir->d_name, ".."))
	188	continue;
	189
	190	sprintf(full_path, "%s/%s", path, dir->d_name);
	191
	192	if (!strcmp(dir->d_name, "dev")) {
	193	if (!check_dev_match(majdev, mindev, full_path)) {
	194	found = 1;
	195	break;
	196	}
	197	}
	198
199	if (lstat(full_path, &st) == -1) {
200	perror("stat");
201	break;
202	}
203
204	if (!S_ISDIR(st.st_mode) \|\| S_ISLNK(st.st_mode))
205	continue;
206
207	found = find_block_dir(majdev, mindev, full_path);
208	if (found) {
209	strcpy(path, full_path);
210	break;
211	}
212	}
213
214	closedir(D);
215	return found;
216	}
217
218	static void __init_disk_util(struct thread_data td, struct fio_file f)
219	{
220	struct stat st;
221	char foo[PATH_MAX], tmp[PATH_MAX];
e11c410c	222	struct disk_util *du;
9f8f2064 JA	223	int mindev, majdev;
	224	char *p;
	225
8cc7afa9	226	if (!lstat(f->file_name, &st)) {
9f8f2064 JA	227	if (S_ISBLK(st.st_mode)) {
	228	majdev = major(st.st_rdev);
	229	mindev = minor(st.st_rdev);
	230	} else if (S_ISCHR(st.st_mode)) {
	231	majdev = major(st.st_rdev);
	232	mindev = minor(st.st_rdev);
8cc7afa9 JA	233	if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
	234	return;
	235	} else if (S_ISFIFO(st.st_mode))
	236	return;
	237	else {
9f8f2064 JA	238	majdev = major(st.st_dev);
	239	mindev = minor(st.st_dev);
	240	}
	241	} else {
	242	/*
	243	* must be a file, open "." in that path
	244	*/
	245	strncpy(foo, f->file_name, PATH_MAX - 1);
	246	p = dirname(foo);
	247	if (stat(p, &st)) {
	248	perror("disk util stat");
	249	return;
	250	}
	251
	252	majdev = major(st.st_dev);
	253	mindev = minor(st.st_dev);
	254	}
	255
cd991b9e JA	256	dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", f->file_name,
	257	majdev, mindev);
	258
e11c410c JA	259	du = disk_util_exists(majdev, mindev);
	260	if (du) {
	261	if (td->o.ioscheduler && !td->sysfs_root)
	262	td->sysfs_root = strdup(du->sysfs_root);
	263
9f8f2064	264	return;
e11c410c	265	}
9f8f2064 JA	266
	267	/*
	268	* for an fs without a device, we will repeatedly stat through
	269	* sysfs which can take oodles of time for thousands of files. so
	270	* cache the last lookup and compare with that before going through
	271	* everything again.
	272	*/
	273	if (mindev == last_mindev && majdev == last_majdev)
	274	return;
	275
	276	last_mindev = mindev;
	277	last_majdev = majdev;
5ec10eaa	278
9f8f2064 JA	279	sprintf(foo, "/sys/block");
	280	if (!find_block_dir(majdev, mindev, foo))
	281	return;
	282
	283	/*
	284	* If there's a ../queue/ directory there, we are inside a partition.
	285	* Check if that is the case and jump back. For loop/md/dm etc we
	286	* are already in the right spot.
	287	*/
	288	sprintf(tmp, "%s/../queue", foo);
	289	if (!stat(tmp, &st)) {
	290	p = dirname(foo);
	291	sprintf(tmp, "%s/queue", p);
	292	if (stat(tmp, &st)) {
	293	log_err("unknown sysfs layout\n");
	294	return;
	295	}
	296	strncpy(tmp, p, PATH_MAX - 1);
	297	sprintf(foo, "%s", tmp);
	298	}
	299
	300	if (td->o.ioscheduler && !td->sysfs_root)
	301	td->sysfs_root = strdup(foo);
	302
	303	disk_util_add(majdev, mindev, foo);
	304	}
	305
	306	void init_disk_util(struct thread_data *td)
	307	{
	308	struct fio_file *f;
	309	unsigned int i;
	310
	311	if (!td->o.do_disk_util \|\|
	312	(td->io_ops->flags & (FIO_DISKLESSIO \| FIO_NODISKUTIL)))
	313	return;
	314
	315	for_each_file(td, f, i)
	316	__init_disk_util(td, f);
	317	}
	318
9f8f2064 JA	319	void show_disk_util(void)
	320	{
	321	struct disk_util_stat *dus;
	322	struct list_head entry, next;
	323	struct disk_util *du;
	324	double util;
	325
0a839f30 JA	326	if (list_empty(&disk_list))
	327	return;
	328
9f8f2064 JA	329	log_info("\nDisk stats (read/write):\n");
	330
	331	list_for_each(entry, &disk_list) {
	332	du = list_entry(entry, struct disk_util, list);
	333	dus = &du->dus;
	334
	335	util = (double) 100 * du->dus.io_ticks / (double) du->msec;
	336	if (util > 100.0)
	337	util = 100.0;
	338
5ec10eaa JA	339	log_info(" %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, "
	340	"in_queue=%u, util=%3.2f%%\n", du->name,
	341	dus->ios[0], dus->ios[1],
	342	dus->merges[0], dus->merges[1],
	343	dus->ticks[0], dus->ticks[1],
	344	dus->time_in_queue, util);
9f8f2064 JA	345	}
	346
	347	/*
	348	* now free the list
	349	*/
	350	list_for_each_safe(entry, next, &disk_list) {
	351	list_del(entry);
	352	du = list_entry(entry, struct disk_util, list);
	353	free(du->name);
	354	free(du);
	355	}
	356	}