3 * Copyright (C) 2013 Chad Malfait
4 * Copyright (C) 2014 Carnegie Mellon University
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Chad Malfait <malfaitc at yahoo.com>
21 * Benjamin Gilbert <bgilbert at backtick.net>
31 #define NO_VALUE UINT64_MAX
32 #define PERCENT_SCALE_FACTOR 1e-8
34 static uint64_t get_lv_property_int(lv_t lv, char const *property)
36 lvm_property_value_t v;
38 v = lvm_lv_get_property(lv, property);
39 if (!v.is_valid || !v.is_integer)
41 /* May be NO_VALUE if @property does not apply to this LV */
42 return v.value.integer;
45 static char const *get_lv_property_string(lv_t lv, char const *property)
47 lvm_property_value_t v;
49 v = lvm_lv_get_property(lv, property);
50 if (!v.is_valid || !v.is_string)
52 return v.value.string;
55 static void lvm_submit (char const *plugin_instance, char const *type_instance,
58 value_list_t vl = VALUE_LIST_INIT;
60 vl.values = &(value_t) { .gauge = (gauge_t) ivalue };
63 sstrncpy(vl.plugin, "lvm", sizeof (vl.plugin));
64 sstrncpy(vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance));
65 sstrncpy(vl.type, "df_complex", sizeof (vl.type));
66 sstrncpy(vl.type_instance, type_instance, sizeof (vl.type_instance));
68 plugin_dispatch_values (&vl);
71 static void report_lv_utilization(lv_t lv, char const *vg_name,
72 char const *lv_name, uint64_t lv_size,
73 char const *used_percent_property)
75 uint64_t used_percent_unscaled;
77 char plugin_instance[DATA_MAX_NAME_LEN];
79 used_percent_unscaled = get_lv_property_int(lv, used_percent_property);
80 if (used_percent_unscaled == NO_VALUE)
82 used_bytes = lv_size * (used_percent_unscaled * PERCENT_SCALE_FACTOR);
84 ssnprintf(plugin_instance, sizeof(plugin_instance), "%s-%s",
86 lvm_submit(plugin_instance, "used", used_bytes);
87 lvm_submit(plugin_instance, "free", lv_size - used_bytes);
90 static void report_thin_pool_utilization(lv_t lv, char const *vg_name,
94 char const *metadata_lv;
95 uint64_t metadata_size;
97 data_lv = get_lv_property_string(lv, "data_lv");
98 metadata_lv = get_lv_property_string(lv, "metadata_lv");
99 metadata_size = get_lv_property_int(lv, "lv_metadata_size");
100 if (data_lv == NULL || metadata_lv == NULL || metadata_size == NO_VALUE)
103 report_lv_utilization(lv, vg_name, data_lv, lv_size, "data_percent");
104 report_lv_utilization(lv, vg_name, metadata_lv, metadata_size,
108 static void vg_read(vg_t vg, char const *vg_name)
111 struct lvm_lv_list *lvl;
116 lvm_submit (vg_name, "free", lvm_vg_get_free_size(vg));
118 lvs = lvm_vg_list_lvs(vg);
120 /* no VGs are defined, which is not an error per se */
124 dm_list_iterate_items(lvl, lvs) {
125 name = lvm_lv_get_name(lvl->lv);
126 attrs = get_lv_property_string(lvl->lv, "lv_attr");
127 size = lvm_lv_get_size(lvl->lv);
128 if (name == NULL || attrs == NULL || size == NO_VALUE)
131 /* Condition on volume type. We want the reported sizes in the
132 volume group to sum to the size of the volume group, so we ignore
137 /* Snapshot. Also report used/free space. */
138 report_lv_utilization(lvl->lv, vg_name, name, size,
142 /* Thin pool virtual volume. We report the underlying data
143 and metadata volumes, not this one. Report used/free
144 space, then ignore. */
145 report_thin_pool_utilization(lvl->lv, vg_name, size);
148 /* Virtual volume. Ignore. */
151 /* Thin volume or thin snapshot. Ignore. */
154 lvm_submit(vg_name, name, size);
158 static int lvm_read(void)
161 struct dm_list *vg_names;
162 struct lvm_str_list *name_list;
164 lvm = lvm_init(NULL);
166 ERROR("lvm plugin: lvm_init failed.");
170 vg_names = lvm_list_vg_names(lvm);
172 ERROR("lvm plugin lvm_list_vg_name failed %s", lvm_errmsg(lvm));
177 dm_list_iterate_items(name_list, vg_names) {
180 vg = lvm_vg_open(lvm, name_list->str, "r", 0);
182 ERROR ("lvm plugin: lvm_vg_open (%s) failed: %s",
183 name_list->str, lvm_errmsg(lvm));
187 vg_read(vg, name_list->str);
195 void module_register(void)
197 plugin_register_read("lvm", lvm_read);
198 } /* void module_register */