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/*
* Copyright (C) 2010 Max Matveev. 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* kstat has counters for vnode operations for each filesystem.
*
* Unfortunately the counters for mounted fileystems are mixed with counters
* for the filesystem types and there is no obvious way to distinguish
* between the two except by trying to convert the kstat's name to the number
* and see if works */
#include <stdio.h>
#include <kstat.h>
#include <sys/mnttab.h>
#include <sys/stat.h>
#include "common.h"
struct mountpoint {
struct mountpoint *next;
dev_t dev;
char mountpoint[];
};
static struct mountpoint *mountpoints;
static struct timespec mtime;
/* NB! The order of entires in mountopoints list is important:
* lofs mounts use the same device number but appear later
* in /etc/mnttab then the target filesystem - keeping the
* order the same as /etc/mnttab means that more "logical"
* mountpoints are reported, in particular the counters
* for "/" are not reported as /lib/libc.so.1 */
static void
cache_mnttab(void)
{
FILE *f;
struct mnttab m;
struct mountpoint *mp;
struct stat sb;
struct mountpoint **tail = &mountpoints;
if (stat("/etc/mnttab", &sb) < 0)
return;
if (mountpoints &&
(sb.st_mtim.tv_sec == mtime.tv_sec) &&
(sb.st_mtim.tv_nsec == mtime.tv_nsec))
return;
if ((f = fopen("/etc/mnttab", "r")) == NULL)
return;
for (mp = mountpoints; mp; mp = mountpoints) {
mountpoints = mp->next;
free(mp);
}
while(getmntent(f, &m) == 0) {
char *devop= hasmntopt(&m, "dev");
if (devop) {
char *end;
dev_t d = strtoul(devop+4, &end, 16);
if ((end != devop+4) && (*end != '\0')) {
fprintf(stderr, "Bogus device number %s for filesystem %s\n",
devop+4, m.mnt_mountp);
continue;
}
mp = malloc(sizeof(*mp) + strlen(m.mnt_mountp) + 1);
if (mp == NULL) {
fprintf(stderr,
"Cannot allocate memory for cache entry of %s\n",
m.mnt_mountp);
continue;
}
mp->next = NULL;
mp->dev = d;
strcpy(mp->mountpoint, m.mnt_mountp);
*tail = mp;
tail = &mp->next;
}
}
fclose(f);
mtime = sb.st_mtim;
}
static const char *
mountpoint_bydev(dev_t dev)
{
int i;
for (i=0; i < 2; i++) {
struct mountpoint *mp = mountpoints;
while(mp) {
if (mp->dev == dev)
return mp->mountpoint;
mp = mp->next;
}
cache_mnttab();
}
return NULL;
}
int
vnops_fetch(pmdaMetric *pm, int inst, pmAtomValue *av)
{
char *fsname;
metricdesc_t *md = pm->m_user;
kstat_t *k;
char *stat = (char *)md->md_offset;
if (pmid_item(pm->m_desc.pmid) == 1023) { /* hinv.nfilesys */
int sts;
sts = pmdaCacheOp(indomtab[FILESYS_INDOM].it_indom, PMDA_CACHE_SIZE_ACTIVE);
if (sts < 0)
return 0;
else {
av->ul = sts;
return 1;
}
}
if (pmdaCacheLookup(pm->m_desc.indom, inst, &fsname,
(void **)&k) != PMDA_CACHE_ACTIVE)
return PM_ERR_INST;
if (k) {
kstat_named_t *kn = kstat_data_lookup(k, stat);
if (kn == NULL) {
fprintf(stderr, "No kstat called %s for %s\n", stat, fsname);
return 0;
}
return kstat_named_to_typed_atom(kn, pm->m_desc.type, av);
}
return 0;
}
static void
vnops_update_stats(int fetch)
{
kstat_t *k;
kstat_ctl_t *kc = kstat_ctl_update();
if (kc == NULL)
return;
for (k = kc->kc_chain; k != NULL; k = k->ks_next) {
int rv;
kstat_t *cached;
const char *key;
dev_t dev;
char *end;
pmInDom indom;
if (strcmp(k->ks_module, "unix") ||
strncmp(k->ks_name, "vopstats_", sizeof("vopstats_")-1))
continue;
key = k->ks_name + 9;
dev = strtoul(key, &end, 16);
if ((end != key) && (*end == '\0')) {
indom = indomtab[FILESYS_INDOM].it_indom;
if ((key = mountpoint_bydev(dev)) == NULL)
continue;
} else {
indom = indomtab[FSTYPE_INDOM].it_indom;
}
if (pmdaCacheLookupName(indom, key, &rv,
(void **)&cached) != PMDA_CACHE_ACTIVE) {
rv = pmdaCacheStore(indom, PMDA_CACHE_ADD, key, k);
if (rv < 0) {
__pmNotifyErr(LOG_WARNING,
"Cannot create instance for "
"filesystem '%s': %s\n",
key, pmErrStr(rv));
continue;
}
}
if (fetch)
kstat_read(kc, k, NULL);
}
}
void
vnops_refresh(void)
{
pmdaCacheOp(indomtab[FILESYS_INDOM].it_indom, PMDA_CACHE_INACTIVE);
pmdaCacheOp(indomtab[FSTYPE_INDOM].it_indom, PMDA_CACHE_INACTIVE);
vnops_update_stats(1);
pmdaCacheOp(indomtab[FILESYS_INDOM].it_indom, PMDA_CACHE_SAVE);
pmdaCacheOp(indomtab[FSTYPE_INDOM].it_indom, PMDA_CACHE_SAVE);
}
void
vnops_init(int first)
{
pmdaCacheOp(indomtab[FILESYS_INDOM].it_indom, PMDA_CACHE_LOAD);
pmdaCacheOp(indomtab[FSTYPE_INDOM].it_indom, PMDA_CACHE_LOAD);
vnops_update_stats(0);
pmdaCacheOp(indomtab[FILESYS_INDOM].it_indom, PMDA_CACHE_SAVE);
pmdaCacheOp(indomtab[FSTYPE_INDOM].it_indom, PMDA_CACHE_SAVE);
}
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