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/*
* Copyright (C) 2009 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.
*/
#include <libzfs.h>
#include "common.h"
struct zpool_stats {
int vdev_stats_fresh;
vdev_stat_t vds;
};
static libzfs_handle_t *zh;
static int zp_added;
/*
* For each zpool check the name in the instance cache, if it's not there then
* add it to the cache. Regardless if it's the first time we've seen this one
* or if it was in the cache before refresh the stats
*/
static int
zp_cache_pool(zpool_handle_t *zp, void *arg)
{
nvlist_t *cfg = zpool_get_config(zp, NULL);
char *zpname = (char *)zpool_get_name(zp);
struct zpool_stats *zps = NULL;
pmInDom zpindom = indomtab[ZPOOL_INDOM].it_indom;
uint_t cnt = 0;
vdev_stat_t *vds;
int rv;
int inst;
nvlist_t *vdt;
if ((rv = pmdaCacheLookupName(zpindom, zpname, &inst,
(void **)&zps)) != PMDA_CACHE_ACTIVE) {
int newpool = (zps == NULL);
if (rv != PMDA_CACHE_INACTIVE || zps == NULL) {
zps = malloc(sizeof(*zps));
if (zps == NULL) {
__pmNotifyErr(LOG_WARNING,
"Cannot allocate memory to hold stats for "
"zpool '%s'\n",
zpname);
goto done;
}
}
rv = pmdaCacheStore(zpindom, PMDA_CACHE_ADD, zpname, zps);
if (rv < 0) {
__pmNotifyErr(LOG_WARNING,
"Cannot add '%s' to the cache "
"for instance domain %s: %s\n",
zpname, pmInDomStr(zpindom), pmErrStr(rv));
free(zps);
goto done;
}
zp_added += newpool;
}
rv = nvlist_lookup_nvlist(cfg, ZPOOL_CONFIG_VDEV_TREE, &vdt);
if (rv != 0) {
__pmNotifyErr(LOG_ERR, "Cannot get vdev tree for '%s': %d %d\n",
zpname, rv, oserror());
zps->vdev_stats_fresh = 0;
} else {
/* accommodate zpool api changes ... */
#ifdef ZPOOL_CONFIG_VDEV_STATS
rv = nvlist_lookup_uint64_array(vdt, ZPOOL_CONFIG_VDEV_STATS,
(uint64_t **)&vds, &cnt);
#else
rv = nvlist_lookup_uint64_array(vdt, ZPOOL_CONFIG_STATS,
(uint64_t **)&vds, &cnt);
#endif
if (rv == 0) {
memcpy(&zps->vds, vds, sizeof(zps->vds));
zps->vdev_stats_fresh = 1;
} else {
__pmNotifyErr(LOG_ERR,
"Cannot get zpool stats for '%s': %d %d\n",
zpname, rv, oserror());
zps->vdev_stats_fresh = 0;
}
}
done:
zpool_close(zp);
return 0;
}
void
zpool_refresh(void)
{
zp_added = 0;
pmdaCacheOp(indomtab[ZPOOL_INDOM].it_indom, PMDA_CACHE_INACTIVE);
zpool_iter(zh, zp_cache_pool, NULL);
if (zp_added) {
pmdaCacheOp(indomtab[ZPOOL_INDOM].it_indom, PMDA_CACHE_SAVE);
}
}
int
zpool_fetch(pmdaMetric *pm, int inst, pmAtomValue *atom)
{
struct zpool_stats *zps;
char *zpname;
metricdesc_t *md = pm->m_user;
if (pmdaCacheLookup(indomtab[ZPOOL_INDOM].it_indom, inst, &zpname,
(void **)&zps) != PMDA_CACHE_ACTIVE)
return PM_ERR_INST;
if (zps->vdev_stats_fresh) {
switch (pmid_item(md->md_desc.pmid)) {
case 0: /* zpool.state */
atom->cp = zpool_state_to_name(zps->vds.vs_state, zps->vds.vs_aux);
break;
case 1: /* zpool.state_int */
atom->ul = (zps->vds.vs_aux << 8) | zps->vds.vs_state;
break;
default:
memcpy(&atom->ull, ((char *)&zps->vds) + md->md_offset,
sizeof(atom->ull));
}
}
return zps->vdev_stats_fresh;
}
void
zpool_init(int first)
{
if (zh)
return;
zh = libzfs_init();
if (zh) {
pmdaCacheOp(indomtab[ZPOOL_INDOM].it_indom, PMDA_CACHE_LOAD);
zpool_iter(zh, zp_cache_pool, NULL);
pmdaCacheOp(indomtab[ZPOOL_INDOM].it_indom, PMDA_CACHE_SAVE);
}
}
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