1 /**
2 * collectd - src/df.c
3 * Copyright (C) 2005,2006 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
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.
14 *
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
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "utils_mount.h"
28 #define MODULE_NAME "df"
30 #if HAVE_STATFS || HAVE_STATVFS
31 # define DF_HAVE_READ 1
32 #else
33 # define DF_HAVE_READ 0
34 #endif
36 #if HAVE_STATVFS
37 # if HAVE_SYS_STATVFS_H
38 # include <sys/statvfs.h>
39 # endif
40 # define STATANYFS statvfs
41 # define BLOCKSIZE(s) ((s).f_frsize ? (s).f_frsize : (s).f_bsize)
42 #elif HAVE_STATFS
43 # if HAVE_SYS_STATFS_H
44 # include <sys/statfs.h>
45 # endif
46 # define STATANYFS statfs
47 # define BLOCKSIZE(s) (s).f_bsize
48 #endif
50 static char *filename_template = "df-%s.rrd";
52 static char *ds_def[] =
53 {
54 "DS:used:GAUGE:"COLLECTD_HEARTBEAT":0:U",
55 "DS:free:GAUGE:"COLLECTD_HEARTBEAT":0:U",
56 NULL
57 };
58 static int ds_num = 2;
60 #define BUFSIZE 512
62 static void df_init (void)
63 {
64 return;
65 }
67 static void df_write (char *host, char *inst, char *val)
68 {
69 char file[BUFSIZE];
70 int status;
72 status = snprintf (file, BUFSIZE, filename_template, inst);
73 if (status < 1)
74 return;
75 else if (status >= BUFSIZE)
76 return;
78 rrd_update_file (host, file, val, ds_def, ds_num);
79 }
81 #if DF_HAVE_READ
82 static void df_submit (char *df_name,
83 unsigned long long df_used,
84 unsigned long long df_free)
85 {
86 char buf[BUFSIZE];
88 if (snprintf (buf, BUFSIZE, "%u:%llu:%llu", (unsigned int) curtime,
89 df_used, df_free) >= BUFSIZE)
90 return;
92 plugin_submit (MODULE_NAME, df_name, buf);
93 }
95 static void df_read (void)
96 {
97 #if HAVE_STATVFS
98 struct statvfs statbuf;
99 #elif HAVE_STATFS
100 struct statfs statbuf;
101 #endif
102 /* struct STATANYFS statbuf; */
103 cu_mount_t *mnt_list;
104 cu_mount_t *mnt_ptr;
106 unsigned long long blocksize;
107 unsigned long long df_free;
108 unsigned long long df_used;
109 char mnt_name[BUFSIZE];
111 mnt_list = NULL;
112 if (cu_mount_getlist (&mnt_list) == NULL)
113 return;
115 for (mnt_ptr = mnt_list; mnt_ptr != NULL; mnt_ptr = mnt_ptr->next)
116 {
117 if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
118 {
119 syslog (LOG_ERR, "statv?fs failed: %s", strerror (errno));
120 continue;
121 }
123 if (!statbuf.f_blocks)
124 continue;
126 blocksize = BLOCKSIZE(statbuf);
127 df_free = statbuf.f_bfree * blocksize;
128 df_used = (statbuf.f_blocks - statbuf.f_bfree) * blocksize;
130 if (strcmp (mnt_ptr->dir, "/") == 0)
131 {
132 strncpy (mnt_name, "root", BUFSIZE);
133 }
134 else
135 {
136 int i, len;
138 strncpy (mnt_name, mnt_ptr->dir + 1, BUFSIZE);
139 len = strlen (mnt_name);
141 for (i = 0; i < len; i++)
142 if (mnt_name[i] == '/')
143 mnt_name[i] = '-';
144 }
146 df_submit (mnt_name, df_used, df_free);
147 }
149 cu_mount_freelist (mnt_list);
150 } /* static void df_read (void) */
151 #else
152 # define df_read NULL
153 #endif /* DF_HAVE_READ */
155 void module_register (void)
156 {
157 plugin_register (MODULE_NAME, df_init, df_read, df_write);
158 }
160 #undef BUFSIZE
161 #undef MODULE_NAME