1 /**
2 * collectd - src/disk.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"
27 #define MODULE_NAME "disk"
29 #if defined(KERNEL_LINUX) || defined(HAVE_LIBKSTAT)
30 # define DISK_HAVE_READ 1
31 #else
32 # define DISK_HAVE_READ 0
33 #endif
35 static char *disk_filename_template = "disk-%s.rrd";
36 static char *part_filename_template = "partition-%s.rrd";
38 /* 104857600 == 100 MB */
39 static char *disk_ds_def[] =
40 {
41 "DS:rcount:COUNTER:25:0:U",
42 "DS:rmerged:COUNTER:25:0:U",
43 "DS:rbytes:COUNTER:25:0:104857600",
44 "DS:rtime:COUNTER:25:0:U",
45 "DS:wcount:COUNTER:25:0:U",
46 "DS:wmerged:COUNTER:25:0:U",
47 "DS:wbytes:COUNTER:25:0:104857600",
48 "DS:wtime:COUNTER:25:0:U",
49 NULL
50 };
51 static int disk_ds_num = 8;
53 static char *part_ds_def[] =
54 {
55 "DS:rcount:COUNTER:25:0:U",
56 "DS:rbytes:COUNTER:25:0:104857600",
57 "DS:wcount:COUNTER:25:0:U",
58 "DS:wbytes:COUNTER:25:0:104857600",
59 NULL
60 };
61 static int part_ds_num = 4;
63 #ifdef KERNEL_LINUX
64 typedef struct diskstats
65 {
66 char *name;
68 /* This overflows in roughly 1361 year */
69 unsigned int poll_count;
71 unsigned int read_sectors;
72 unsigned int write_sectors;
74 unsigned long long read_bytes;
75 unsigned long long write_bytes;
77 struct diskstats *next;
78 } diskstats_t;
80 static diskstats_t *disklist;
81 /* #endif defined(KERNEL_LINUX) */
83 #elif defined(HAVE_LIBKSTAT)
84 #define MAX_NUMDISK 256
85 extern kstat_ctl_t *kc;
86 static kstat_t *ksp[MAX_NUMDISK];
87 static int numdisk = 0;
88 #endif /* HAVE_LIBKSTAT */
90 static void disk_init (void)
91 {
92 #ifdef HAVE_LIBKSTAT
93 kstat_t *ksp_chain;
95 numdisk = 0;
97 if (kc == NULL)
98 return;
100 for (numdisk = 0, ksp_chain = kc->kc_chain;
101 (numdisk < MAX_NUMDISK) && (ksp_chain != NULL);
102 ksp_chain = ksp_chain->ks_next)
103 {
104 if (strncmp (ksp_chain->ks_class, "disk", 4)
105 && strncmp (ksp_chain->ks_class, "partition", 9))
106 continue;
107 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
108 continue;
109 ksp[numdisk++] = ksp_chain;
110 }
111 #endif
113 return;
114 }
116 static void disk_write (char *host, char *inst, char *val)
117 {
118 char file[512];
119 int status;
121 status = snprintf (file, 512, disk_filename_template, inst);
122 if (status < 1)
123 return;
124 else if (status >= 512)
125 return;
127 rrd_update_file (host, file, val, disk_ds_def, disk_ds_num);
128 }
130 static void partition_write (char *host, char *inst, char *val)
131 {
132 char file[512];
133 int status;
135 status = snprintf (file, 512, part_filename_template, inst);
136 if (status < 1)
137 return;
138 else if (status >= 512)
139 return;
141 rrd_update_file (host, file, val, part_ds_def, part_ds_num);
142 }
144 #if DISK_HAVE_READ
145 #define BUFSIZE 512
146 static void disk_submit (char *disk_name,
147 unsigned long long read_count,
148 unsigned long long read_merged,
149 unsigned long long read_bytes,
150 unsigned long long read_time,
151 unsigned long long write_count,
152 unsigned long long write_merged,
153 unsigned long long write_bytes,
154 unsigned long long write_time)
155 {
156 char buf[BUFSIZE];
158 if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu:%llu:%llu:%llu",
159 (unsigned int) curtime,
160 read_count, read_merged, read_bytes, read_time,
161 write_count, write_merged, write_bytes,
162 write_time) >= BUFSIZE)
163 return;
165 plugin_submit (MODULE_NAME, disk_name, buf);
166 }
168 static void partition_submit (char *part_name,
169 unsigned long long read_count,
170 unsigned long long read_bytes,
171 unsigned long long write_count,
172 unsigned long long write_bytes)
173 {
174 char buf[BUFSIZE];
176 if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu",
177 (unsigned int) curtime,
178 read_count, read_bytes, write_count,
179 write_bytes) >= BUFSIZE)
180 return;
182 plugin_submit ("partition", part_name, buf);
183 }
184 #undef BUFSIZE
186 static void disk_read (void)
187 {
188 #ifdef KERNEL_LINUX
189 FILE *fh;
190 char buffer[1024];
191 char disk_name[128];
193 char *fields[32];
194 int numfields;
195 int fieldshift = 0;
197 int major = 0;
198 int minor = 0;
200 unsigned int read_sectors;
201 unsigned int write_sectors;
203 unsigned long long read_count = 0;
204 unsigned long long read_merged = 0;
205 unsigned long long read_bytes = 0;
206 unsigned long long read_time = 0;
207 unsigned long long write_count = 0;
208 unsigned long long write_merged = 0;
209 unsigned long long write_bytes = 0;
210 unsigned long long write_time = 0;
211 int is_disk = 0;
213 diskstats_t *ds, *pre_ds;
215 if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
216 {
217 if ((fh = fopen ("/proc/partitions", "r")) == NULL)
218 return;
220 /* Kernel is 2.4.* */
221 fieldshift = 1;
222 }
224 while (fgets (buffer, 1024, fh) != NULL)
225 {
226 numfields = strsplit (buffer, fields, 32);
228 if ((numfields != (14 + fieldshift)) && (numfields != 7))
229 continue;
231 major = atoll (fields[0]);
232 minor = atoll (fields[1]);
234 if (snprintf (disk_name, 128, "%i-%i", major, minor) < 1)
235 continue;
236 disk_name[127] = '\0';
238 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
239 if (strcmp (disk_name, ds->name) == 0)
240 break;
242 if (ds == NULL)
243 {
244 if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
245 continue;
247 if ((ds->name = strdup (disk_name)) == NULL)
248 {
249 free (ds);
250 continue;
251 }
253 if (pre_ds == NULL)
254 disklist = ds;
255 else
256 pre_ds->next = ds;
257 }
259 is_disk = 0;
260 if (numfields == 7)
261 {
262 /* Kernel 2.6, Partition */
263 read_count = atoll (fields[3]);
264 read_sectors = atoi (fields[4]);
265 write_count = atoll (fields[5]);
266 write_sectors = atoi (fields[6]);
267 }
268 else if (numfields == (14 + fieldshift))
269 {
270 read_count = atoll (fields[3 + fieldshift]);
271 write_count = atoll (fields[7 + fieldshift]);
273 read_sectors = atoi (fields[5 + fieldshift]);
274 write_sectors = atoi (fields[9 + fieldshift]);
276 if ((fieldshift == 0) || (minor == 0))
277 {
278 is_disk = 1;
279 read_merged = atoll (fields[4 + fieldshift]);
280 read_time = atoll (fields[6 + fieldshift]);
281 write_merged = atoll (fields[8 + fieldshift]);
282 write_time = atoll (fields[10+ fieldshift]);
283 }
284 }
285 else
286 {
287 continue;
288 }
291 if (read_sectors >= ds->read_sectors)
292 ds->read_bytes += 512 * (read_sectors - ds->read_sectors);
293 else
294 ds->read_bytes += 512 * ((UINT_MAX - ds->read_sectors) + read_sectors);
296 if (write_sectors >= ds->write_sectors)
297 ds->write_bytes += 512 * (write_sectors - ds->write_sectors);
298 else
299 ds->write_bytes += 512 * ((UINT_MAX - ds->write_sectors) + write_sectors);
301 ds->read_sectors = read_sectors;
302 ds->write_sectors = write_sectors;
303 read_bytes = ds->read_bytes;
304 write_bytes = ds->write_bytes;
306 /* Don't write to the RRDs if we've just started.. */
307 ds->poll_count++;
308 if (ds->poll_count <= 6)
309 continue;
311 if ((read_count == 0) && (write_count == 0))
312 continue;
314 if (is_disk)
315 disk_submit (disk_name, read_count, read_merged, read_bytes, read_time,
316 write_count, write_merged, write_bytes, write_time);
317 else
318 partition_submit (disk_name, read_count, read_bytes, write_count, write_bytes);
319 }
321 fclose (fh);
322 /* #endif defined(KERNEL_LINUX) */
324 #elif defined(HAVE_LIBKSTAT)
325 static kstat_io_t kio;
326 int i;
328 if (kc == NULL)
329 return;
331 for (i = 0; i < numdisk; i++)
332 {
333 if (kstat_read (kc, ksp[i], &kio) == -1)
334 continue;
336 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
337 disk_submit (ksp[i]->ks_name,
338 kio.reads, 0LL, kio.nread, kio.rtime,
339 kio.writes, 0LL, kio.nwritten, kio.wtime);
340 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
341 partition_submit (ksp[i]->ks_name,
342 kio.reads, kio.nread,
343 kio.writes,kio.nwritten);
344 }
345 #endif /* defined(HAVE_LIBKSTAT) */
346 } /* static void disk_read (void) */
347 #else
348 # define disk_read NULL
349 #endif /* DISK_HAVE_READ */
351 void module_register (void)
352 {
353 plugin_register ("partition", NULL, NULL, partition_write);
354 plugin_register (MODULE_NAME, disk_init, disk_read, disk_write);
355 }
357 #undef MODULE_NAME