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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.
*
* 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
*/
#include <libzfs.h>
#include "common.h"
static libzfs_handle_t *zh;
static int zf_added;
struct zfs_data {
zfs_handle_t *zh;
uint64_t nsnaps;
};
/*
* For each filesystem or snapshot check if the name is in the
* corresponding instance cache. If it's not there then add it to the
* cache. If we've cached the new instance then we keep the zfs_handle
* which we've received in the argument, otherwise we need to close it
* - zfs_iter_root() expects that from us.
*
* For filesystems iterate over their snapshots and update snapshot
* count which is stored in the cached data for the instances in ZFS_INDOM
* domain.
*/
static int
zfs_cache_inst(zfs_handle_t *zf, void *arg)
{
const char *fsname = zfs_get_name(zf);
pmInDom zfindom;
int inst, rv;
struct zfs_data *zdata = NULL;
uint64_t *snapcnt = arg;
switch (zfs_get_type(zf)) {
case ZFS_TYPE_FILESYSTEM:
zfindom = indomtab[ZFS_INDOM].it_indom;
break;
case ZFS_TYPE_SNAPSHOT:
(*snapcnt)++;
zfindom = indomtab[ZFS_SNAP_INDOM].it_indom;
break;
default:
zfs_close(zf);
return 0;
}
if ((rv = pmdaCacheLookupName(zfindom, fsname, &inst,
(void **)&zdata)) == PMDA_CACHE_ACTIVE) {
zfs_close(zf);
zfs_refresh_properties(zdata->zh);
zf = zdata->zh;
} else if ((rv == PMDA_CACHE_INACTIVE) && zdata) {
rv = pmdaCacheStore(zfindom, PMDA_CACHE_ADD, fsname, zdata);
if (rv < 0) {
__pmNotifyErr(LOG_WARNING,
"Cannot reactivate cached data for '%s': %s\n",
fsname, pmErrStr(rv));
zfs_close(zf);
return 0;
}
zfs_close(zf);
zfs_refresh_properties(zdata->zh);
zf = zdata->zh;
} else {
if ((zdata = calloc(1, sizeof(*zdata))) == NULL) {
__pmNotifyErr(LOG_WARNING,
"Out of memory for data of %s\n", fsname);
zfs_close(zf);
return 0;
}
zdata->zh = zf;
rv = pmdaCacheStore(zfindom, PMDA_CACHE_ADD, fsname, zdata);
if (rv < 0) {
__pmNotifyErr(LOG_WARNING,
"Cannot cache data for '%s': %s\n",
fsname, pmErrStr(rv));
zfs_close(zf);
return 0;
}
zf_added++;
}
zfs_iter_filesystems(zf, zfs_cache_inst, NULL);
if (zfs_get_type(zf) == ZFS_TYPE_FILESYSTEM) {
zdata->nsnaps = 0;
zfs_iter_snapshots(zf, zfs_cache_inst, &zdata->nsnaps);
}
return 0;
}
void
zfs_refresh(void)
{
zf_added = 0;
pmdaCacheOp(indomtab[ZFS_INDOM].it_indom, PMDA_CACHE_INACTIVE);
pmdaCacheOp(indomtab[ZFS_SNAP_INDOM].it_indom, PMDA_CACHE_INACTIVE);
zfs_iter_root(zh, zfs_cache_inst, NULL);
if (zf_added) {
pmdaCacheOp(indomtab[ZFS_INDOM].it_indom, PMDA_CACHE_SAVE);
pmdaCacheOp(indomtab[ZFS_SNAP_INDOM].it_indom, PMDA_CACHE_SAVE);
}
}
int
zfs_fetch(pmdaMetric *pm, int inst, pmAtomValue *atom)
{
char *fsname;
metricdesc_t *md = pm->m_user;
struct zfs_data *zdata;
uint64_t v;
if (pmdaCacheLookup(pm->m_desc.indom, inst, &fsname,
(void **)&zdata) != PMDA_CACHE_ACTIVE)
return PM_ERR_INST;
if (md->md_offset == -1) { /* nsnapshot */
atom->ull = zdata->nsnaps;
return 1;
}
v = zfs_prop_get_int(zdata->zh, md->md_offset);
/* Special processing - compression ratio is in precent, we export
* it as multiplier */
switch (md->md_offset) {
case ZFS_PROP_COMPRESSRATIO:
atom->d = v / 100.0;
break;
default:
atom->ull = v;
break;
}
return 1;
}
void
zfs_init(int first)
{
if (zh)
return;
zh = libzfs_init();
if (zh) {
pmdaCacheOp(indomtab[ZFS_INDOM].it_indom, PMDA_CACHE_LOAD);
pmdaCacheOp(indomtab[ZFS_SNAP_INDOM].it_indom, PMDA_CACHE_LOAD);
zfs_iter_root(zh, zfs_cache_inst, &first);
pmdaCacheOp(indomtab[ZFS_INDOM].it_indom, PMDA_CACHE_SAVE);
pmdaCacheOp(indomtab[ZFS_SNAP_INDOM].it_indom, PMDA_CACHE_SAVE);
}
}
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