src/disk.c

   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  **/
  22
  23 #include "disk.h"
  24
  25 #if COLLECT_DISK
  26 #define MODULE_NAME "disk"
  27
  28 #include "plugin.h"
  29 #include "common.h"
  30
  31 #ifdef KERNEL_LINUX
  32 typedef struct diskstats
  33 {
  34         char *name;
  35
  36         unsigned int read_sectors;
  37         unsigned int write_sectors;
  38
  39         unsigned long long read_bytes;
  40         unsigned long long write_bytes;
  41
  42         struct diskstats *next;
  43 } diskstats_t;
  44
  45 static diskstats_t *disklist;
  46 /* KERNEL_LINUX */
  47
  48 #elif defined(HAVE_LIBKSTAT)
  49 #define MAX_NUMDISK 256
  50 extern kstat_ctl_t *kc;
  51 static kstat_t *ksp[MAX_NUMDISK];
  52 static int numdisk = 0;
  53 #endif /* HAVE_LIBKSTAT */
  54
  55 static char *disk_filename_template = "disk-%s.rrd";
  56 static char *part_filename_template = "partition-%s.rrd";
  57
  58 /* 104857600 == 100 MB */
  59 static char *disk_ds_def[] =
  60 {
  61         "DS:rcount:COUNTER:25:0:U",
  62         "DS:rmerged:COUNTER:25:0:U",
  63         "DS:rbytes:COUNTER:25:0:104857600",
  64         "DS:rtime:COUNTER:25:0:U",
  65         "DS:wcount:COUNTER:25:0:U",
  66         "DS:wmerged:COUNTER:25:0:U",
  67         "DS:wbytes:COUNTER:25:0:104857600",
  68         "DS:wtime:COUNTER:25:0:U",
  69         NULL
  70 };
  71 static int disk_ds_num = 8;
  72
  73 static char *part_ds_def[] =
  74 {
  75         "DS:rcount:COUNTER:25:0:U",
  76         "DS:rbytes:COUNTER:25:0:104857600",
  77         "DS:wcount:COUNTER:25:0:U",
  78         "DS:wbytes:COUNTER:25:0:104857600",
  79         NULL
  80 };
  81 static int part_ds_num = 4;
  82
  83 extern time_t curtime;
  84
  85 void disk_init (void)
  86 {
  87 #ifdef HAVE_LIBKSTAT
  88         kstat_t *ksp_chain;
  89
  90         numdisk = 0;
  91
  92         if (kc == NULL)
  93                 return;
  94
  95         for (numdisk = 0, ksp_chain = kc->kc_chain;
  96                         (numdisk < MAX_NUMDISK) && (ksp_chain != NULL);
  97                         ksp_chain = ksp_chain->ks_next)
  98         {
  99                 if (strncmp (ksp_chain->ks_class, "disk", 4)
 100                                 && strncmp (ksp_chain->ks_class, "partition", 9))
 101                         continue;
 102                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
 103                         continue;
 104                 ksp[numdisk++] = ksp_chain;
 105         }
 106 #endif
 107
 108         return;
 109 }
 110
 111 void disk_write (char *host, char *inst, char *val)
 112 {
 113         char file[512];
 114         int status;
 115
 116         status = snprintf (file, 512, disk_filename_template, inst);
 117         if (status < 1)
 118                 return;
 119         else if (status >= 512)
 120                 return;
 121
 122         rrd_update_file (host, file, val, disk_ds_def, disk_ds_num);
 123 }
 124
 125 void partition_write (char *host, char *inst, char *val)
 126 {
 127         char file[512];
 128         int status;
 129
 130         status = snprintf (file, 512, part_filename_template, inst);
 131         if (status < 1)
 132                 return;
 133         else if (status >= 512)
 134                 return;
 135
 136         rrd_update_file (host, file, val, part_ds_def, part_ds_num);
 137 }
 138
 139 #define BUFSIZE 512
 140 void disk_submit (char *disk_name,
 141                 unsigned long long read_count,
 142                 unsigned long long read_merged,
 143                 unsigned long long read_bytes,
 144                 unsigned long long read_time,
 145                 unsigned long long write_count,
 146                 unsigned long long write_merged,
 147                 unsigned long long write_bytes,
 148                 unsigned long long write_time)
 149 {
 150         char buf[BUFSIZE];
 151
 152         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu:%llu:%llu:%llu",
 153                                 (unsigned int) curtime,
 154                                 read_count, read_merged, read_bytes, read_time,
 155                                 write_count, write_merged, write_bytes,
 156                                 write_time) >= BUFSIZE)
 157                 return;
 158
 159         plugin_submit (MODULE_NAME, disk_name, buf);
 160 }
 161
 162 void partition_submit (char *part_name,
 163                 unsigned long long read_count,
 164                 unsigned long long read_bytes,
 165                 unsigned long long write_count,
 166                 unsigned long long write_bytes)
 167 {
 168         char buf[BUFSIZE];
 169
 170         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu",
 171                                 (unsigned int) curtime,
 172                                 read_count, read_bytes, write_count,
 173                                 write_bytes) >= BUFSIZE)
 174                 return;
 175
 176         plugin_submit ("partition", part_name, buf);
 177 }
 178 #undef BUFSIZE
 179
 180 void disk_read (void)
 181 {
 182 #ifdef KERNEL_LINUX
 183         FILE *fh;
 184         char buffer[1024];
 185         char disk_name[128];
 186
 187         char *fields[32];
 188         int numfields;
 189         int fieldshift = 0;
 190
 191         int major = 0;
 192         int minor = 0;
 193
 194         unsigned int read_sectors;
 195         unsigned int write_sectors;
 196
 197         unsigned long long read_count    = 0;
 198         unsigned long long read_merged   = 0;
 199         unsigned long long read_bytes    = 0;
 200         unsigned long long read_time     = 0;
 201         unsigned long long write_count   = 0;
 202         unsigned long long write_merged  = 0;
 203         unsigned long long write_bytes   = 0;
 204         unsigned long long write_time    = 0;
 205         int is_disk = 0;
 206
 207         diskstats_t *ds, *pre_ds;
 208
 209         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 210         {
 211                 if ((fh = fopen ("/proc/partitions", "r")) == NULL)
 212                         return;
 213
 214                 /* Kernel is 2.4.* */
 215                 fieldshift = 1;
 216         }
 217
 218         while (fgets (buffer, 1024, fh) != NULL)
 219         {
 220                 numfields = strsplit (buffer, fields, 32);
 221
 222                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 223                         continue;
 224
 225                 major = atoll (fields[0]);
 226                 minor = atoll (fields[1]);
 227
 228                 if (snprintf (disk_name, 128, "%i-%i", major, minor) < 1)
 229                         continue;
 230                 disk_name[127] = '\0';
 231
 232                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 233                         if (strcmp (disk_name, ds->name) == 0)
 234                                 break;
 235
 236                 if (ds == NULL)
 237                 {
 238                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 239                                 continue;
 240
 241                         if ((ds->name = strdup (disk_name)) == NULL)
 242                         {
 243                                 free (ds);
 244                                 continue;
 245                         }
 246
 247                         if (pre_ds == NULL)
 248                                 disklist = ds;
 249                         else
 250                                 pre_ds->next = ds;
 251                 }
 252
 253                 is_disk = 0;
 254                 if (numfields == 7)
 255                 {
 256                         /* Kernel 2.6, Partition */
 257                         read_count    = atoll (fields[3]);
 258                         read_sectors  = atoi  (fields[4]);
 259                         write_count   = atoll (fields[5]);
 260                         write_sectors = atoi  (fields[6]);
 261                 }
 262                 else if (numfields == (14 + fieldshift))
 263                 {
 264                         read_count  =  atoll (fields[3 + fieldshift]);
 265                         write_count =  atoll (fields[7 + fieldshift]);
 266
 267                         read_sectors  = atoi (fields[5 + fieldshift]);
 268                         write_sectors = atoi (fields[9 + fieldshift]);
 269
 270                         if ((fieldshift == 0) || (minor == 0))
 271                         {
 272                                 is_disk = 1;
 273                                 read_merged  = atoll (fields[4 + fieldshift]);
 274                                 read_time    = atoll (fields[6 + fieldshift]);
 275                                 write_merged = atoll (fields[8 + fieldshift]);
 276                                 write_time   = atoll (fields[10+ fieldshift]);
 277                         }
 278                 }
 279                 else
 280                 {
 281                         continue;
 282                 }
 283
 284
 285                 if (read_sectors >= ds->read_sectors)
 286                         ds->read_bytes += 512 * (read_sectors - ds->read_sectors);
 287                 else
 288                         ds->read_bytes += 512 * ((UINT_MAX - ds->read_sectors) + read_sectors);
 289
 290                 if (write_sectors >= ds->write_sectors)
 291                         ds->write_bytes += 512 * (write_sectors - ds->write_sectors);
 292                 else
 293                         ds->write_bytes += 512 * ((UINT_MAX - ds->write_sectors) + write_sectors);
 294
 295                 ds->read_sectors  = read_sectors;
 296                 ds->write_sectors = write_sectors;
 297                 read_bytes  = ds->read_bytes;
 298                 write_bytes = ds->write_bytes;
 299
 300
 301                 if ((read_count == 0) && (write_count == 0))
 302                         continue;
 303
 304                 if (is_disk)
 305                         disk_submit (disk_name, read_count, read_merged, read_bytes, read_time,
 306                                         write_count, write_merged, write_bytes, write_time);
 307                 else
 308                         partition_submit (disk_name, read_count, read_bytes, write_count, write_bytes);
 309         }
 310
 311         fclose (fh);
 312 /* #endif defined(KERNEL_LINUX) */
 313
 314 #elif defined(HAVE_LIBKSTAT)
 315         static kstat_io_t kio;
 316         int i;
 317
 318         if (kc == NULL)
 319                 return;
 320
 321         for (i = 0; i < numdisk; i++)
 322         {
 323                 if (kstat_read (kc, ksp[i], &kio) == -1)
 324                         continue;
 325
 326                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 327                         disk_submit (ksp[i]->ks_name,
 328                                         kio.reads,  0LL, kio.nread,    kio.rtime,
 329                                         kio.writes, 0LL, kio.nwritten, kio.wtime);
 330                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 331                         partition_submit (ksp[i]->ks_name,
 332                                         kio.reads, kio.nread,
 333                                         kio.writes,kio.nwritten);
 334         }
 335 #endif /* defined(HAVE_LIBKSTAT) */
 336 }
 337
 338 void module_register (void)
 339 {
 340         plugin_register ("partition", NULL, NULL, partition_write);
 341         plugin_register (MODULE_NAME, disk_init, disk_read, disk_write);
 342 }
 343
 344 #undef MODULE_NAME
 345 #endif /* COLLECT_DISK */