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/* disks.c (cpudyn) - Functions to put a disk in stand by */
/* - by Ricardo Galli (C) 2003 -- Licence GPL */
/* Some code extracted from hdparm v 5.3 by Mark Lord */
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <endian.h>
#include <sys/ioctl.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <linux/types.h>
#include <linux/hdreg.h>
#include <linux/major.h>
#include <asm/byteorder.h>
#include <fcntl.h>
#include "cpudynd.h"
#include "disks.h"
static device_t *devices;
static get_opts_t get_device_t_ops;
static char *proc_stat_dir = NULL;
extern unsigned standby_timeout;
int is_active(device_t *dev)
{
unsigned char args[4] = {WIN_CHECKPOWERMODE1,0,0,0};
unsigned state;
if (ioctl(dev->fd, HDIO_DRIVE_CMD, &args)
&& (args[0] = WIN_CHECKPOWERMODE2) /* try again with 0x98 */
&& ioctl(dev->fd, HDIO_DRIVE_CMD, &args)) {
if (errno != EIO || args[0] != 0 || args[1] != 0)
state = 1;
else {
state = 0; // it's sleeping
errprintf("Drive state is: sleeping\n");
}
} else {
state = (args[2] == 255) ? 1 : 0; // 1=active, 0=standby
errprintf("Drive state is: %s\n", state==1 ? "active" : "standby");
}
return state;
}
int flush_buffer_cache (device_t *dev)
{
int res;
res = fsync (dev->fd); /* flush buffers */
if (ioctl(dev->fd, BLKFLSBUF, NULL)) { /* do it again, big time */
errprintf("BLKFLSBUF failed");
return -1;
}
if (ioctl(dev->fd, HDIO_DRIVE_CMD, NULL) && errno != EINVAL) /* await completion */
errprintf("HDIO_DRIVE_CMD(null) (wait for flush complete) failed\n");
dev->flushed = time(NULL);
errprintf("Buffer cache flushed\n");
return 0;
}
int get_dev (char *devname)
{
int fd;
static long parm, multcount;
struct stat stat_buf;
if (stat(devname,&stat_buf)) {
perror(devname);
return -1;
}
switch(major(stat_buf.st_rdev)) {
#ifdef SCSI_DISK0_MAJOR
case (SCSI_DISK0_MAJOR):
case (SCSI_DISK1_MAJOR):
case (SCSI_DISK2_MAJOR):
case (SCSI_DISK3_MAJOR):
case (SCSI_DISK4_MAJOR):
case (SCSI_DISK5_MAJOR):
case (SCSI_DISK6_MAJOR):
case (SCSI_DISK7_MAJOR):
#else
case (SCSI_DISK_MAJOR):
#endif
#ifdef MD_MAJOR
case (MD_MAJOR):
#endif
case (VXVM_MAJOR):
#ifdef LVM_BLK_MAJOR
case (LVM_BLK_MAJOR):
#endif
return -1;
break;
#ifdef XT_DISK_MAJOR
case (XT_DISK_MAJOR):
#endif
case IDE0_MAJOR:
case IDE1_MAJOR:
#ifdef IDE2_MAJOR
case IDE2_MAJOR:
#endif
#ifdef IDE3_MAJOR
case IDE3_MAJOR:
#endif
#ifdef IDE4_MAJOR
case IDE4_MAJOR:
#endif
#ifdef IDE5_MAJOR
case IDE5_MAJOR:
#endif
#ifdef IDE6_MAJOR
case IDE6_MAJOR:
#endif
#ifdef IDE7_MAJOR
case IDE7_MAJOR:
#endif
#ifdef IDE8_MAJOR
case IDE8_MAJOR:
#endif
#ifdef IDE9_MAJOR
case IDE9_MAJOR:
#endif
// Do nothing
break;
default:
return -1;
break;
}
fd = open (devname, O_RDONLY|O_NONBLOCK);
if (fd < 0) {
errprintf("Error opening %d\n", devname);
return -1;
}
return fd;
}
int send_standby(device_t *dev)
{
#ifndef WIN_STANDBYNOW1
#define WIN_STANDBYNOW1 0xE0
#endif
#ifndef WIN_STANDBYNOW2
#define WIN_STANDBYNOW2 0x94
#endif
unsigned char args1[4] = {WIN_STANDBYNOW1,0,0,0};
unsigned char args2[4] = {WIN_STANDBYNOW2,0,0,0};
errprintf("------Issuing standby command\n");
if (ioctl(dev->fd, HDIO_DRIVE_CMD, &args1)
&& ioctl(dev->fd, HDIO_DRIVE_CMD, &args2)) {
errprintf(" HDIO_DRIVE_CMD(standby) failed");
return -1;
}
dev->sleeping = 1;
return 0;
}
void add_device_t(char *dev, int fd)
{
// device_t *ptr = devices, *prev = NULL;
device_t *new;
struct stat stat_buf;
char *tmp;
new = malloc(sizeof(device_t));
if (!new)
die(FALSE, "Couldn't malloc\n");
new->dev = malloc(strlen(dev) + 1);
if (!new->dev)
die(FALSE, "Couldn't malloc\n");
strcpy(new->dev, dev);
if(proc_stat_dir != NULL) {
// Linux 2.5, prepare for /sys/block/dev
tmp = dev + (strlen(dev) -1);
while(*tmp != '/' && tmp > dev) tmp--;
if (*tmp == '/') tmp++;
new->sys_stat = malloc(strlen(proc_stat_dir) + strlen(tmp) + 8);
if (!new->sys_stat)
die(FALSE, "Couldn't malloc\n");
sprintf(new->sys_stat, "%s/%s/stat", proc_stat_dir, tmp);
errprintf("The proc device is %s\n", new->sys_stat);
} else {
// Linux 2.4, we don't need it
new->sys_stat = NULL;
}
new->fd = fd;
stat(dev,&stat_buf);
new->major = major(stat_buf.st_rdev);
new->minor = minor(stat_buf.st_rdev);
new->ops = 0;
new->timestamp = time(NULL);
new->sleeping = 0;
new->flushed = 0;
new->next = devices;
devices = new;
}
int standby_init(unsigned timeout, char *devnames)
{
char *dev_s = NULL;
char devs[1024];
int fd;
int count = 0;
strncpy(devs, devnames, 1023);
dev_s = strtok(devs, ", ");
if( (get_device_t_ops = get_device_t_ops_version()) == NULL) {
errprintf("/proc/stat | /sys/block | /sysfs are not available in the kernel\n");
return 0;
}
while ( dev_s != NULL) {
fd = get_dev(dev_s);
if (fd >= 0 ) {
errprintf("Addind device %s (%d)\n", dev_s, fd);
count ++;
add_device_t(dev_s, fd);
} else {
errprintf("Device %s doesn't allow standby\n", dev_s);
}
dev_s = strtok(NULL, ", ");
}
errprintf("Devices for standby: %d\n", count);
return count;
}
void check_standby()
{
int count = 0;
device_t *ptr = devices;
unsigned ops;
time_t now;
int res;
unsigned elapsed;
now = time(NULL);
while (ptr != NULL) {
ops = get_device_t_ops(ptr, count);
count++;
if ( ops >= 0) {
if ( ops - ptr->ops == 0 ) {
if (ptr->sleeping) {
// Do nothing for this disk
ptr = ptr->next;
continue;
}
elapsed = now - ptr->timestamp;
if( elapsed > standby_timeout) {
if (is_active(ptr)) {
if (ptr->flushed == 0)
flush_buffer_cache(ptr);
res = send_standby(ptr);
if( res < 0) {
errprintf("Error in standby %s\n", ptr->dev);
ptr->timestamp = now;
}
} else {
ptr->sleeping = 1;
}
ptr->flushed = 0;
} else if ( elapsed > (standby_timeout - TIME_TO_FLUSH)
&& ptr->flushed == 0 && is_active(ptr)) {
// We flush in advance before trying to sleep
flush_buffer_cache(ptr);
}
} else {
if (ptr->flushed > 0 && now - ptr->flushed < TIME_TO_FLUSH) {
errprintf("Forgiving, it's flushing\n");
} else {
ptr->flushed = 0;
ptr->timestamp = now;
}
ptr->sleeping = 0;
ptr->ops = ops;
}
}
ptr = ptr->next;
}
}
unsigned get_device_t_ops_24(device_t *dev, int count)
{
static char *dev_line = NULL;
static char major_minor[64];
FILE *fp;
char *str = NULL;
unsigned ops;
if(dev_line == NULL)
dev_line = malloc(1024);
if (!dev)
return 0;
if (count == 0) {
fp = fopen("/proc/stat", "r");
while ( fp && (str=fgets(dev_line, 1024, fp)) ) {
if (strncmp(dev_line, "disk_io:", 8) == 0)
break;
}
fclose(fp);
if (str == NULL) {
errprintf("/proc/stat not available for disk_io\n");
return -1;
}
}
sprintf(major_minor, "(%u,%u):", dev->major, dev->minor);
str = strstr(dev_line, major_minor);
if(str != NULL) {
str = str + strlen(major_minor);
//"(%u,%u):(%u,%u,%u,%u,%u) "
if(sscanf(str, "(%u,%*u,%*u,%*u,%*u)", &ops) == 1) {
errprintf("%s %u operations\n", dev->dev, ops);
return ops;
}
}
return 0;
}
unsigned get_device_t_ops_25(device_t *dev, int count)
{
static char *dev_line = NULL;
static char major_minor[64];
int fd, bytes;
unsigned long long in, out;
if(dev_line == NULL)
dev_line = malloc(1024);
if (!dev)
return 0;
fd = open(dev->sys_stat, O_RDONLY);
if (fd < 0 || (bytes = read(fd, dev_line, 1024)) <= 0) {
errprintf("%s not available for disk_io\n", dev->sys_stat);
close(fd);
return -1;
}
close(fd);
dev_line[bytes] = 0;
//"%u %u %u %u %u %u %u %u %u %u %u"
//"%8u %8u %8llu %8u "
//"%8u %8u %8llu %8u "
//"%8u %8u %8u"
if(sscanf(dev_line, "%*u %*u %llu %*u %*u %*u %llu %*u %*u %*u %*u", &in, &out) == 2) {
errprintf("%s %u operations\n", dev->dev, in+out);
return (unsigned) (in+out) ;
}
return 0;
}
get_opts_t get_device_t_ops_version()
{
struct stat stat_buf;
// Linux >2.5
if (stat("/sys/block",&stat_buf) == 0) {
errprintf("Detected kernel 2.5\n");
proc_stat_dir = "/sys/block";
return get_device_t_ops_25;
}
// Linux >2.5
if (stat("/sysfs/block",&stat_buf) == 0) {
errprintf("Detected kernel 2.5\n");
proc_stat_dir = "/sysfs/block";
return get_device_t_ops_25;
}
// Linux 2.4
if (stat("/proc/stat",&stat_buf) == 0) {
errprintf("Detected kernel 2.4\n");
return get_device_t_ops_24;
}
return NULL;
}
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