1 /**
2 * collectd - src/df.c
3 * Copyright (C) 2005 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_STATFS
37 #define STATANYFS statfs
38 #define BLOCKSIZE(s) (s).f_bsize
40 #elif HAVE_STATVFS
41 #define STATANYFS statvfs
42 #define BLOCKSIZE(s) ((s).f_frsize ? (s).f_frsize : (s).f_bsize)
43 #endif
45 static char *filename_template = "df-%s.rrd";
47 /* 104857600 == 100 MB */
48 static char *ds_def[] =
49 {
50 "DS:used:GAUGE:25:0:U",
51 "DS:free:GAUGE:25:0:U",
52 NULL
53 };
54 static int ds_num = 2;
56 #define BUFSIZE 512
58 static void df_init (void)
59 {
60 return;
61 }
63 static void df_write (char *host, char *inst, char *val)
64 {
65 char file[BUFSIZE];
66 int status;
68 status = snprintf (file, BUFSIZE, filename_template, inst);
69 if (status < 1)
70 return;
71 else if (status >= BUFSIZE)
72 return;
74 rrd_update_file (host, file, val, ds_def, ds_num);
75 }
77 #if DF_HAVE_READ
78 static void df_submit (char *df_name,
79 unsigned long long df_used,
80 unsigned long long df_free)
81 {
82 char buf[BUFSIZE];
84 if (snprintf (buf, BUFSIZE, "%u:%llu:%llu", (unsigned int) curtime,
85 df_used, df_free) >= BUFSIZE)
86 return;
88 plugin_submit (MODULE_NAME, df_name, buf);
89 }
91 static void df_read (void)
92 {
93 struct STATANYFS statbuf;
94 cu_mount_t *mnt_list;
95 cu_mount_t *mnt_ptr;
97 unsigned long long blocksize;
98 unsigned long long df_free;
99 unsigned long long df_used;
100 char mnt_name[BUFSIZE];
102 mnt_list = NULL;
103 if (cu_mount_getlist (&mnt_list) == NULL)
104 {
105 syslog (LOG_WARNING, "cu_mount_getlist returned `NULL'");
106 return;
107 }
109 for (mnt_ptr = mnt_list; mnt_ptr != NULL; mnt_ptr = mnt_ptr->next)
110 {
111 if (STATANYFS (mnt_ptr->dir, &statbuf) < 0)
112 {
113 syslog (LOG_ERR, "statv?fs failed: %s", strerror (errno));
114 continue;
115 }
117 if (!statbuf.f_blocks)
118 continue;
120 blocksize = BLOCKSIZE(statbuf);
121 df_free = statbuf.f_bfree * blocksize;
122 df_used = (statbuf.f_blocks - statbuf.f_bfree) * blocksize;
124 if (strcmp (mnt_ptr->dir, "/") == 0)
125 {
126 strncpy (mnt_name, "root", BUFSIZE);
127 }
128 else
129 {
130 int i, len;
132 strncpy (mnt_name, mnt_ptr->dir + 1, BUFSIZE);
133 len = strlen (mnt_name);
135 for (i = 0; i < len; i++)
136 if (mnt_name[i] == '/')
137 mnt_name[i] = '-';
138 }
140 df_submit (mnt_name, df_used, df_free);
141 }
143 cu_mount_freelist (mnt_list);
144 } /* static void df_read (void) */
145 #else
146 # define df_read NULL
147 #endif /* DF_HAVE_READ */
149 void module_register (void)
150 {
151 plugin_register (MODULE_NAME, df_init, df_read, df_write);
152 }
154 #undef BUFSIZE
155 #undef MODULE_NAME