3 * Copyright (C) 2010,2011 Michael Hanselmann
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; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "utils_ignorelist.h"
27 #include <sys/ioctl.h>
29 #include <linux/major.h>
30 #include <linux/raid/md_u.h>
32 #define PROC_DISKSTATS "/proc/diskstats"
33 #define DEV_DIR "/dev"
35 static const char *config_keys[] =
40 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
42 static ignorelist_t *ignorelist = NULL;
44 static int md_config (const char *key, const char *value)
46 if (ignorelist == NULL)
47 ignorelist = ignorelist_create (/* invert = */ 1);
48 if (ignorelist == NULL)
51 if (strcasecmp (key, "Device") == 0)
53 ignorelist_add (ignorelist, value);
55 else if (strcasecmp (key, "IgnoreSelected") == 0)
57 ignorelist_set_invert (ignorelist, IS_TRUE (value) ? 0 : 1);
67 static void md_submit (const int minor, const char *type_instance,
71 value_list_t vl = VALUE_LIST_INIT;
73 values[0].gauge = value;
77 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
78 sstrncpy (vl.plugin, "md", sizeof (vl.plugin));
79 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
81 sstrncpy (vl.type, "md_disks", sizeof (vl.type));
82 sstrncpy (vl.type_instance, type_instance,
83 sizeof (vl.type_instance));
85 plugin_dispatch_values (&vl);
86 } /* void md_submit */
88 static void md_process (const int minor, const char *path)
93 mdu_array_info_t array;
94 gauge_t disks_missing;
96 fd = open (path, O_RDONLY);
99 WARNING ("md: open(%s): %s", path,
100 sstrerror (errno, errbuf, sizeof (errbuf)));
104 if (fstat (fd, &st) < 0)
106 WARNING ("md: Unable to fstat file descriptor for %s: %s", path,
107 sstrerror (errno, errbuf, sizeof (errbuf)));
112 if (! S_ISBLK (st.st_mode))
114 WARNING ("md: %s is no block device", path);
119 if (st.st_rdev != makedev (MD_MAJOR, minor))
121 WARNING ("md: Major/minor of %s are %i:%i, should be %i:%i",
122 path, (int)major(st.st_rdev), (int)minor(st.st_rdev),
123 (int)MD_MAJOR, minor);
128 /* Retrieve md information */
129 if (ioctl (fd, GET_ARRAY_INFO, &array) < 0) {
130 WARNING ("md: Unable to retrieve array info from %s: %s", path,
131 sstrerror (errno, errbuf, sizeof (errbuf)));
139 * The mdu_array_info_t structure contains numbers of disks in the array.
140 * However, disks are accounted for more than once:
142 * active: Number of active (in sync) disks.
143 * spare: Number of stand-by disks.
144 * working: Number of working disks. (active + sync)
145 * failed: Number of failed disks.
146 * nr: Number of physically present disks. (working + failed)
147 * raid: Number of disks in the RAID. This may be larger than "nr" if
148 * disks are missing and smaller than "nr" when spare disks are
151 md_submit (minor, "active", (gauge_t) array.active_disks);
152 md_submit (minor, "failed", (gauge_t) array.failed_disks);
153 md_submit (minor, "spare", (gauge_t) array.spare_disks);
156 if (array.raid_disks > array.nr_disks)
157 disks_missing = (gauge_t) (array.raid_disks - array.nr_disks);
158 md_submit (minor, "missing", disks_missing);
159 } /* void md_process */
161 static int md_read (void)
166 fh = fopen (PROC_DISKSTATS, "r");
169 WARNING ("md: Unable to open %s: %s",
171 sstrerror (errno, errbuf, sizeof (errbuf)));
175 /* Iterate md devices */
176 while (fgets (buffer, sizeof (buffer), fh) != NULL)
183 /* Extract interesting fields */
184 if (strsplit (buffer, fields, STATIC_ARRAY_SIZE(fields)) < 3)
187 major = atoi (fields[0]);
189 if (major != MD_MAJOR)
192 minor = atoi (fields[1]);
195 if (ignorelist_match (ignorelist, name))
198 /* FIXME: Don't hardcode path. Walk /dev collecting major,
199 * minor and name, then use lookup table to find device.
200 * Alternatively create a temporary device file with correct
201 * major/minor, but that again can be tricky if the filesystem
202 * with the device file is mounted using the "nodev" option.
204 ssnprintf (path, sizeof (path), "%s/%s", DEV_DIR, name);
206 md_process (minor, path);
214 void module_register (void)
216 plugin_register_config ("md", md_config, config_keys, config_keys_num);
217 plugin_register_read ("md", md_read);
218 } /* void module_register */