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
26 #include "utils_ignorelist.h"
28 #include <sys/ioctl.h>
30 #include <linux/major.h>
31 #include <linux/raid/md_u.h>
33 #ifdef HAVE_SYS_SYSMACROS_H
34 #include <sys/sysmacros.h>
37 #define PROC_DISKSTATS "/proc/diskstats"
38 #define DEV_DIR "/dev"
40 static const char *config_keys[] =
45 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
47 static ignorelist_t *ignorelist = NULL;
49 static int md_config (const char *key, const char *value)
51 if (ignorelist == NULL)
52 ignorelist = ignorelist_create (/* invert = */ 1);
53 if (ignorelist == NULL)
56 if (strcasecmp (key, "Device") == 0)
58 ignorelist_add (ignorelist, value);
60 else if (strcasecmp (key, "IgnoreSelected") == 0)
62 ignorelist_set_invert (ignorelist, IS_TRUE (value) ? 0 : 1);
72 static void md_submit (const int minor, const char *type_instance,
75 value_list_t vl = VALUE_LIST_INIT;
77 vl.values = &(value_t) { .gauge = value };
79 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
80 sstrncpy (vl.plugin, "md", sizeof (vl.plugin));
81 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
83 sstrncpy (vl.type, "md_disks", sizeof (vl.type));
84 sstrncpy (vl.type_instance, type_instance,
85 sizeof (vl.type_instance));
87 plugin_dispatch_values (&vl);
88 } /* void md_submit */
90 static void md_process (const int minor, const char *path)
95 mdu_array_info_t array;
96 gauge_t disks_missing;
98 fd = open (path, O_RDONLY);
101 WARNING ("md: open(%s): %s", path,
102 sstrerror (errno, errbuf, sizeof (errbuf)));
106 if (fstat (fd, &st) < 0)
108 WARNING ("md: Unable to fstat file descriptor for %s: %s", path,
109 sstrerror (errno, errbuf, sizeof (errbuf)));
114 if (! S_ISBLK (st.st_mode))
116 WARNING ("md: %s is no block device", path);
121 if (st.st_rdev != makedev (MD_MAJOR, minor))
123 WARNING ("md: Major/minor of %s are %i:%i, should be %i:%i",
124 path, (int)major(st.st_rdev), (int)minor(st.st_rdev),
125 (int)MD_MAJOR, minor);
130 /* Retrieve md information */
131 if (ioctl (fd, GET_ARRAY_INFO, &array) < 0) {
132 WARNING ("md: Unable to retrieve array info from %s: %s", path,
133 sstrerror (errno, errbuf, sizeof (errbuf)));
141 * The mdu_array_info_t structure contains numbers of disks in the array.
142 * However, disks are accounted for more than once:
144 * active: Number of active (in sync) disks.
145 * spare: Number of stand-by disks.
146 * working: Number of working disks. (active + sync)
147 * failed: Number of failed disks.
148 * nr: Number of physically present disks. (working + failed)
149 * raid: Number of disks in the RAID. This may be larger than "nr" if
150 * disks are missing and smaller than "nr" when spare disks are
153 md_submit (minor, "active", (gauge_t) array.active_disks);
154 md_submit (minor, "failed", (gauge_t) array.failed_disks);
155 md_submit (minor, "spare", (gauge_t) array.spare_disks);
158 if (array.raid_disks > array.nr_disks)
159 disks_missing = (gauge_t) (array.raid_disks - array.nr_disks);
160 md_submit (minor, "missing", disks_missing);
161 } /* void md_process */
163 static int md_read (void)
168 fh = fopen (PROC_DISKSTATS, "r");
171 WARNING ("md: Unable to open %s: %s",
173 sstrerror (errno, errbuf, sizeof (errbuf)));
177 /* Iterate md devices */
178 while (fgets (buffer, sizeof (buffer), fh) != NULL)
185 /* Extract interesting fields */
186 if (strsplit (buffer, fields, STATIC_ARRAY_SIZE(fields)) < 3)
189 major = atoi (fields[0]);
191 if (major != MD_MAJOR)
194 minor = atoi (fields[1]);
197 if (ignorelist_match (ignorelist, name))
200 /* FIXME: Don't hardcode path. Walk /dev collecting major,
201 * minor and name, then use lookup table to find device.
202 * Alternatively create a temporary device file with correct
203 * major/minor, but that again can be tricky if the filesystem
204 * with the device file is mounted using the "nodev" option.
206 ssnprintf (path, sizeof (path), "%s/%s", DEV_DIR, name);
208 md_process (minor, path);
216 void module_register (void)
218 plugin_register_config ("md", md_config, config_keys, config_keys_num);
219 plugin_register_read ("md", md_read);
220 } /* void module_register */