+++ /dev/null
-/**
- * collectd - src/lvm.c
- * Copyright (C) 2013 Chad Malfait
- * Copyright (C) 2014 Carnegie Mellon University
- *
- * 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; only version 2 of the License is applicable.
- *
- * 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 St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Authors:
- * Chad Malfait <malfaitc at yahoo.com>
- * Benjamin Gilbert <bgilbert at backtick.net>
- **/
-
-#include "collectd.h"
-
-#include "common.h"
-#include "plugin.h"
-
-#include <lvm2app.h>
-
-#ifdef HAVE_SYS_CAPABILITY_H
-#include <sys/capability.h>
-#endif /* HAVE_SYS_CAPABILITY_H */
-
-#define NO_VALUE UINT64_MAX
-#define PERCENT_SCALE_FACTOR 1e-8
-
-static uint64_t get_lv_property_int(lv_t lv, char const *property) {
- lvm_property_value_t v;
-
- v = lvm_lv_get_property(lv, property);
- if (!v.is_valid || !v.is_integer)
- return NO_VALUE;
- /* May be NO_VALUE if @property does not apply to this LV */
- return v.value.integer;
-}
-
-static char const *get_lv_property_string(lv_t lv, char const *property) {
- lvm_property_value_t v;
-
- v = lvm_lv_get_property(lv, property);
- if (!v.is_valid || !v.is_string)
- return NULL;
- return v.value.string;
-}
-
-static void lvm_submit(char const *plugin_instance, char const *type_instance,
- uint64_t ivalue) {
- value_list_t vl = VALUE_LIST_INIT;
-
- vl.values = &(value_t){.gauge = (gauge_t)ivalue};
- vl.values_len = 1;
-
- sstrncpy(vl.plugin, "lvm", sizeof(vl.plugin));
- sstrncpy(vl.plugin_instance, plugin_instance, sizeof(vl.plugin_instance));
- sstrncpy(vl.type, "df_complex", sizeof(vl.type));
- sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
-
- plugin_dispatch_values(&vl);
-}
-
-static void report_lv_utilization(lv_t lv, char const *vg_name,
- char const *lv_name, uint64_t lv_size,
- char const *used_percent_property) {
- uint64_t used_percent_unscaled;
- uint64_t used_bytes;
- char plugin_instance[DATA_MAX_NAME_LEN];
-
- used_percent_unscaled = get_lv_property_int(lv, used_percent_property);
- if (used_percent_unscaled == NO_VALUE)
- return;
- used_bytes = lv_size * (used_percent_unscaled * PERCENT_SCALE_FACTOR);
-
- snprintf(plugin_instance, sizeof(plugin_instance), "%s-%s", vg_name, lv_name);
- lvm_submit(plugin_instance, "used", used_bytes);
- lvm_submit(plugin_instance, "free", lv_size - used_bytes);
-}
-
-static void report_thin_pool_utilization(lv_t lv, char const *vg_name,
- uint64_t lv_size) {
- char const *data_lv;
- char const *metadata_lv;
- uint64_t metadata_size;
-
- data_lv = get_lv_property_string(lv, "data_lv");
- metadata_lv = get_lv_property_string(lv, "metadata_lv");
- metadata_size = get_lv_property_int(lv, "lv_metadata_size");
- if (data_lv == NULL || metadata_lv == NULL || metadata_size == NO_VALUE)
- return;
-
- report_lv_utilization(lv, vg_name, data_lv, lv_size, "data_percent");
- report_lv_utilization(lv, vg_name, metadata_lv, metadata_size,
- "metadata_percent");
-}
-
-static void vg_read(vg_t vg, char const *vg_name) {
- struct dm_list *lvs;
- struct lvm_lv_list *lvl;
- char const *name;
- char const *attrs;
- uint64_t size;
-
- lvm_submit(vg_name, "free", lvm_vg_get_free_size(vg));
-
- lvs = lvm_vg_list_lvs(vg);
- if (!lvs) {
- /* no VGs are defined, which is not an error per se */
- return;
- }
-
- dm_list_iterate_items(lvl, lvs) {
- name = lvm_lv_get_name(lvl->lv);
- attrs = get_lv_property_string(lvl->lv, "lv_attr");
- size = lvm_lv_get_size(lvl->lv);
- if (name == NULL || attrs == NULL || size == NO_VALUE)
- continue;
-
- /* Condition on volume type. We want the reported sizes in the
- volume group to sum to the size of the volume group, so we ignore
- virtual volumes. */
- switch (attrs[0]) {
- case 's':
- case 'S':
- /* Snapshot. Also report used/free space. */
- report_lv_utilization(lvl->lv, vg_name, name, size, "data_percent");
- break;
- case 't':
- /* Thin pool virtual volume. We report the underlying data
- and metadata volumes, not this one. Report used/free
- space, then ignore. */
- report_thin_pool_utilization(lvl->lv, vg_name, size);
- continue;
- case 'v':
- /* Virtual volume. Ignore. */
- continue;
- case 'V':
- /* Thin volume or thin snapshot. Ignore. */
- continue;
- }
- lvm_submit(vg_name, name, size);
- }
-}
-
-static int lvm_read(void) {
- lvm_t lvm;
- struct dm_list *vg_names;
- struct lvm_str_list *name_list;
-
- lvm = lvm_init(NULL);
- if (!lvm) {
- ERROR("lvm plugin: lvm_init failed.");
- return -1;
- }
-
- vg_names = lvm_list_vg_names(lvm);
- if (!vg_names) {
- ERROR("lvm plugin lvm_list_vg_name failed %s", lvm_errmsg(lvm));
- lvm_quit(lvm);
- return -1;
- }
-
- dm_list_iterate_items(name_list, vg_names) {
- vg_t vg;
-
- vg = lvm_vg_open(lvm, name_list->str, "r", 0);
- if (!vg) {
- ERROR("lvm plugin: lvm_vg_open (%s) failed: %s", name_list->str,
- lvm_errmsg(lvm));
- continue;
- }
-
- vg_read(vg, name_list->str);
- lvm_vg_close(vg);
- }
-
- lvm_quit(lvm);
- return 0;
-} /*lvm_read */
-
-static int c_lvm_init(void) {
-#if defined(HAVE_SYS_CAPABILITY_H) && defined(CAP_SYS_ADMIN)
- if (check_capability(CAP_SYS_ADMIN) != 0) {
- if (getuid() == 0)
- WARNING("lvm plugin: Running collectd as root, but the "
- "CAP_SYS_ADMIN capability is missing. The plugin's read "
- "function will probably fail. Is your init system dropping "
- "capabilities?");
- else
- WARNING("lvm plugin: collectd doesn't have the CAP_SYS_ADMIN "
- "capability. If you don't want to run collectd as root, try "
- "running \"setcap cap_sys_admin=ep\" on the collectd binary.");
- }
-#endif
- return 0;
-}
-
-void module_register(void) {
- plugin_register_init("lvm", c_lvm_init);
- plugin_register_read("lvm", lvm_read);
-} /* void module_register */
projects / collectd.git / blobdiff