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/*
* Copyright (c) 2004 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <mach/mach.h>
#define IOKIT 1
#include <device/device_types.h>
#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOKitLib.h>
#include <IOKit/storage/IOBlockStorageDriver.h>
#include <IOKit/storage/IOMedia.h>
#include <IOKit/IOBSD.h>
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include "disk.h"
/*
* Ensure we have space for the next device in our pre-allocated
* device pool. If not, make some or pass on the error.
*/
static int
check_stats_size(struct diskstats *stats, int count)
{
if (count > stats->highwater) {
stats->highwater++;
stats->disks = realloc(stats->disks,
stats->highwater * sizeof(struct diskstat));
if (!stats->disks) {
stats->highwater = 0;
return -ENOMEM;
}
}
return 0;
}
/*
* Insert all disks into the global disk instance domain.
*/
static int
update_disk_indom(struct diskstats *all, int count, pmdaIndom *indom)
{
int i;
if (count > 0 && count != indom->it_numinst) {
i = sizeof(pmdaInstid) * count;
if ((indom->it_set = realloc(indom->it_set, i)) == NULL) {
indom->it_numinst = 0;
return -ENOMEM;
}
}
for (i = 0; i < count; i++) {
indom->it_set[i].i_name = all->disks[i].name;
indom->it_set[i].i_inst = i;
}
indom->it_numinst = count;
return 0;
}
/*
* Update the global counters with values from one disk.
*/
static void
update_disk_totals(struct diskstats *all, struct diskstat *disk)
{
all->read += disk->read;
all->write += disk->write;
all->read_bytes += disk->read_bytes;
all->write_bytes += disk->write_bytes;
all->blkread += disk->read_bytes / disk->blocksize;
all->blkwrite += disk->write_bytes / disk->blocksize;
all->read_time += disk->read_time;
all->write_time += disk->write_time;
}
static void
clear_disk_totals(struct diskstats *all)
{
all->read = 0;
all->write = 0;
all->read_bytes = 0;
all->write_bytes = 0;
all->blkread = 0;
all->blkwrite = 0;
all->read_time = 0;
all->write_time = 0;
}
/*
* Update the counters associated with a single disk.
*/
static void
update_disk_stats(struct diskstat *disk,
CFDictionaryRef pproperties, CFDictionaryRef properties)
{
CFDictionaryRef statistics;
CFStringRef name;
CFNumberRef number;
memset(disk, 0, sizeof(struct diskstat));
/* Get name from the drive properties */
name = (CFStringRef) CFDictionaryGetValue(pproperties,
CFSTR(kIOBSDNameKey));
if(name == NULL)
return; /* Not much we can do with no name */
CFStringGetCString(name, disk->name, DEVNAMEMAX,
CFStringGetSystemEncoding());
/* Get the blocksize from the drive properties */
number = (CFNumberRef) CFDictionaryGetValue(pproperties,
CFSTR(kIOMediaPreferredBlockSizeKey));
if(number == NULL)
return; /* Not much we can do with no number */
CFNumberGetValue(number, kCFNumberSInt64Type, &disk->blocksize);
/* Get the statistics from the device properties. */
statistics = (CFDictionaryRef) CFDictionaryGetValue(properties,
CFSTR(kIOBlockStorageDriverStatisticsKey));
if (statistics) {
number = (CFNumberRef) CFDictionaryGetValue(statistics,
CFSTR(kIOBlockStorageDriverStatisticsReadsKey));
if (number)
CFNumberGetValue(number, kCFNumberSInt64Type,
&disk->read);
number = (CFNumberRef) CFDictionaryGetValue(statistics,
CFSTR(kIOBlockStorageDriverStatisticsWritesKey));
if (number)
CFNumberGetValue(number, kCFNumberSInt64Type,
&disk->write);
number = (CFNumberRef) CFDictionaryGetValue(statistics,
CFSTR(kIOBlockStorageDriverStatisticsBytesReadKey));
if (number)
CFNumberGetValue(number, kCFNumberSInt64Type,
&disk->read_bytes);
number = (CFNumberRef) CFDictionaryGetValue(statistics,
CFSTR(kIOBlockStorageDriverStatisticsBytesWrittenKey));
if (number)
CFNumberGetValue(number, kCFNumberSInt64Type,
&disk->write_bytes);
number = (CFNumberRef) CFDictionaryGetValue(statistics,
CFSTR(kIOBlockStorageDriverStatisticsLatentReadTimeKey));
if (number)
CFNumberGetValue(number, kCFNumberSInt64Type,
&disk->read_time);
number = (CFNumberRef) CFDictionaryGetValue(statistics,
CFSTR(kIOBlockStorageDriverStatisticsLatentWriteTimeKey));
if (number)
CFNumberGetValue(number, kCFNumberSInt64Type,
&disk->write_time);
}
}
static int
update_disk(diskstats_t *stats, io_registry_entry_t drive, int index)
{
io_registry_entry_t device;
CFDictionaryRef pproperties, properties;
int status;
/* Get the drives parent, from which we get statistics. */
status = IORegistryEntryGetParentEntry(drive, kIOServicePlane, &device);
if (status != KERN_SUCCESS)
return -oserror();
if (!IOObjectConformsTo(device, "IOBlockStorageDriver")) {
IOObjectRelease(device);
return 0;
}
/* Obtain the drive properties. */
pproperties = 0;
status = IORegistryEntryCreateCFProperties(drive,
(CFMutableDictionaryRef *)&pproperties,
kCFAllocatorDefault, kNilOptions);
if (status != KERN_SUCCESS) {
IOObjectRelease(device);
return -oserror();
}
/* Obtain the device properties. */
properties = 0;
status = IORegistryEntryCreateCFProperties(device,
(CFMutableDictionaryRef *)&properties,
kCFAllocatorDefault, kNilOptions);
if (status != KERN_SUCCESS) {
IOObjectRelease(device);
return -oserror();
}
/* Make space to store the actual values, then go get them. */
status = check_stats_size(stats, index + 1);
if (status < 0) {
IOObjectRelease(device);
} else {
update_disk_stats(&stats->disks[index], pproperties, properties);
update_disk_totals(stats, &stats->disks[index]);
}
CFRelease(pproperties);
CFRelease(properties);
return status;
}
int
refresh_disks(struct diskstats *stats, pmdaIndom *indom)
{
io_registry_entry_t drive;
CFMutableDictionaryRef match;
int i, status;
static int inited = 0;
static mach_port_t mach_master_port;
static io_iterator_t mach_device_list;
if (!inited) {
/* Get ports and services for device statistics. */
if (IOMasterPort(bootstrap_port, &mach_master_port)) {
fprintf(stderr, "%s: IOMasterPort error\n", __FUNCTION__);
return -oserror();
}
memset(stats, 0, sizeof(struct diskstats));
inited = 1;
}
/* Get an interator for IOMedia objects (drives). */
match = IOServiceMatching("IOMedia");
CFDictionaryAddValue(match, CFSTR(kIOMediaWholeKey), kCFBooleanTrue);
status = IOServiceGetMatchingServices(mach_master_port,
match, &mach_device_list);
if (status != KERN_SUCCESS) {
fprintf(stderr, "%s: IOServiceGetMatchingServices error\n",
__FUNCTION__);
return -oserror();
}
indom->it_numinst = 0;
clear_disk_totals(stats);
for (i = 0; (drive = IOIteratorNext(mach_device_list)) != 0; i++) {
status = update_disk(stats, drive, i);
if (status)
break;
IOObjectRelease(drive);
}
IOIteratorReset(mach_device_list);
if (!status)
status = update_disk_indom(stats, i, indom);
return status;
}
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