diskutil.c - pub/scm/linux/kernel/git/axboe/fio - Git at Google

 #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 itimerval itimer;

 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;

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

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

 	if (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) != 11) {
 		fclose(f);
 		return 1;
 	}

 	fclose(f);
 	return 0;
 }

 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;

 	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;

 	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);

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

 	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);
 	}

 	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 disk_util_timer_arm(void)
 {
 	itimer.it_value.tv_sec = 0;
 	itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
 	setitimer(ITIMER_REAL, &itimer, NULL);
 }

 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);
 	}
 }
	#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 itimerval itimer;

	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;

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

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

	if (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) != 11) {
	fclose(f);
	return 1;
	}

	fclose(f);
	return 0;
	}

	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;

	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;

	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);

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

	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);
	}

	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 disk_util_timer_arm(void)
	{
	itimer.it_value.tv_sec = 0;
	itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
	setitimer(ITIMER_REAL, &itimer, NULL);
	}

	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);
	}
	}