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 "collectd.h"
  24 #include "common.h"
  25 #include "plugin.h"
  26
  27 #define MODULE_NAME "disk"
  28
  29 #if defined(KERNEL_LINUX) || defined(HAVE_LIBKSTAT)
  30 # define DISK_HAVE_READ 1
  31 #else
  32 # define DISK_HAVE_READ 0
  33 #endif
  34
  35 static char *disk_filename_template = "disk-%s.rrd";
  36 static char *part_filename_template = "partition-%s.rrd";
  37
  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;
  52
  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;
  62
  63 #ifdef KERNEL_LINUX
  64 typedef struct diskstats
  65 {
  66         char *name;
  67
  68         unsigned int read_sectors;
  69         unsigned int write_sectors;
  70
  71         unsigned long long read_bytes;
  72         unsigned long long write_bytes;
  73
  74         struct diskstats *next;
  75 } diskstats_t;
  76
  77 static diskstats_t *disklist;
  78 /* #endif defined(KERNEL_LINUX) */
  79
  80 #elif defined(HAVE_LIBKSTAT)
  81 #define MAX_NUMDISK 256
  82 extern kstat_ctl_t *kc;
  83 static kstat_t *ksp[MAX_NUMDISK];
  84 static int numdisk = 0;
  85 #endif /* HAVE_LIBKSTAT */
  86
  87 static void disk_init (void)
  88 {
  89 #ifdef HAVE_LIBKSTAT
  90         kstat_t *ksp_chain;
  91
  92         numdisk = 0;
  93
  94         if (kc == NULL)
  95                 return;
  96
  97         for (numdisk = 0, ksp_chain = kc->kc_chain;
  98                         (numdisk < MAX_NUMDISK) && (ksp_chain != NULL);
  99                         ksp_chain = ksp_chain->ks_next)
 100         {
 101                 if (strncmp (ksp_chain->ks_class, "disk", 4)
 102                                 && strncmp (ksp_chain->ks_class, "partition", 9))
 103                         continue;
 104                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
 105                         continue;
 106                 ksp[numdisk++] = ksp_chain;
 107         }
 108 #endif
 109
 110         return;
 111 }
 112
 113 static void disk_write (char *host, char *inst, char *val)
 114 {
 115         char file[512];
 116         int status;
 117
 118         status = snprintf (file, 512, disk_filename_template, inst);
 119         if (status < 1)
 120                 return;
 121         else if (status >= 512)
 122                 return;
 123
 124         rrd_update_file (host, file, val, disk_ds_def, disk_ds_num);
 125 }
 126
 127 static void partition_write (char *host, char *inst, char *val)
 128 {
 129         char file[512];
 130         int status;
 131
 132         status = snprintf (file, 512, part_filename_template, inst);
 133         if (status < 1)
 134                 return;
 135         else if (status >= 512)
 136                 return;
 137
 138         rrd_update_file (host, file, val, part_ds_def, part_ds_num);
 139 }
 140
 141 #define BUFSIZE 512
 142 static void disk_submit (char *disk_name,
 143                 unsigned long long read_count,
 144                 unsigned long long read_merged,
 145                 unsigned long long read_bytes,
 146                 unsigned long long read_time,
 147                 unsigned long long write_count,
 148                 unsigned long long write_merged,
 149                 unsigned long long write_bytes,
 150                 unsigned long long write_time)
 151 {
 152         char buf[BUFSIZE];
 153
 154         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu:%llu:%llu:%llu",
 155                                 (unsigned int) curtime,
 156                                 read_count, read_merged, read_bytes, read_time,
 157                                 write_count, write_merged, write_bytes,
 158                                 write_time) >= BUFSIZE)
 159                 return;
 160
 161         plugin_submit (MODULE_NAME, disk_name, buf);
 162 }
 163
 164 static void partition_submit (char *part_name,
 165                 unsigned long long read_count,
 166                 unsigned long long read_bytes,
 167                 unsigned long long write_count,
 168                 unsigned long long write_bytes)
 169 {
 170         char buf[BUFSIZE];
 171
 172         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu",
 173                                 (unsigned int) curtime,
 174                                 read_count, read_bytes, write_count,
 175                                 write_bytes) >= BUFSIZE)
 176                 return;
 177
 178         plugin_submit ("partition", part_name, buf);
 179 }
 180 #undef BUFSIZE
 181
 182 #if DISK_HAVE_READ
 183 static void disk_read (void)
 184 {
 185 #ifdef KERNEL_LINUX
 186         FILE *fh;
 187         char buffer[1024];
 188         char disk_name[128];
 189
 190         char *fields[32];
 191         int numfields;
 192         int fieldshift = 0;
 193
 194         int major = 0;
 195         int minor = 0;
 196
 197         unsigned int read_sectors;
 198         unsigned int write_sectors;
 199
 200         unsigned long long read_count    = 0;
 201         unsigned long long read_merged   = 0;
 202         unsigned long long read_bytes    = 0;
 203         unsigned long long read_time     = 0;
 204         unsigned long long write_count   = 0;
 205         unsigned long long write_merged  = 0;
 206         unsigned long long write_bytes   = 0;
 207         unsigned long long write_time    = 0;
 208         int is_disk = 0;
 209
 210         diskstats_t *ds, *pre_ds;
 211
 212         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 213         {
 214                 if ((fh = fopen ("/proc/partitions", "r")) == NULL)
 215                         return;
 216
 217                 /* Kernel is 2.4.* */
 218                 fieldshift = 1;
 219         }
 220
 221         while (fgets (buffer, 1024, fh) != NULL)
 222         {
 223                 numfields = strsplit (buffer, fields, 32);
 224
 225                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 226                         continue;
 227
 228                 major = atoll (fields[0]);
 229                 minor = atoll (fields[1]);
 230
 231                 if (snprintf (disk_name, 128, "%i-%i", major, minor) < 1)
 232                         continue;
 233                 disk_name[127] = '\0';
 234
 235                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 236                         if (strcmp (disk_name, ds->name) == 0)
 237                                 break;
 238
 239                 if (ds == NULL)
 240                 {
 241                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 242                                 continue;
 243
 244                         if ((ds->name = strdup (disk_name)) == NULL)
 245                         {
 246                                 free (ds);
 247                                 continue;
 248                         }
 249
 250                         if (pre_ds == NULL)
 251                                 disklist = ds;
 252                         else
 253                                 pre_ds->next = ds;
 254                 }
 255
 256                 is_disk = 0;
 257                 if (numfields == 7)
 258                 {
 259                         /* Kernel 2.6, Partition */
 260                         read_count    = atoll (fields[3]);
 261                         read_sectors  = atoi  (fields[4]);
 262                         write_count   = atoll (fields[5]);
 263                         write_sectors = atoi  (fields[6]);
 264                 }
 265                 else if (numfields == (14 + fieldshift))
 266                 {
 267                         read_count  =  atoll (fields[3 + fieldshift]);
 268                         write_count =  atoll (fields[7 + fieldshift]);
 269
 270                         read_sectors  = atoi (fields[5 + fieldshift]);
 271                         write_sectors = atoi (fields[9 + fieldshift]);
 272
 273                         if ((fieldshift == 0) || (minor == 0))
 274                         {
 275                                 is_disk = 1;
 276                                 read_merged  = atoll (fields[4 + fieldshift]);
 277                                 read_time    = atoll (fields[6 + fieldshift]);
 278                                 write_merged = atoll (fields[8 + fieldshift]);
 279                                 write_time   = atoll (fields[10+ fieldshift]);
 280                         }
 281                 }
 282                 else
 283                 {
 284                         continue;
 285                 }
 286
 287
 288                 if (read_sectors >= ds->read_sectors)
 289                         ds->read_bytes += 512 * (read_sectors - ds->read_sectors);
 290                 else
 291                         ds->read_bytes += 512 * ((UINT_MAX - ds->read_sectors) + read_sectors);
 292
 293                 if (write_sectors >= ds->write_sectors)
 294                         ds->write_bytes += 512 * (write_sectors - ds->write_sectors);
 295                 else
 296                         ds->write_bytes += 512 * ((UINT_MAX - ds->write_sectors) + write_sectors);
 297
 298                 ds->read_sectors  = read_sectors;
 299                 ds->write_sectors = write_sectors;
 300                 read_bytes  = ds->read_bytes;
 301                 write_bytes = ds->write_bytes;
 302
 303
 304                 if ((read_count == 0) && (write_count == 0))
 305                         continue;
 306
 307                 if (is_disk)
 308                         disk_submit (disk_name, read_count, read_merged, read_bytes, read_time,
 309                                         write_count, write_merged, write_bytes, write_time);
 310                 else
 311                         partition_submit (disk_name, read_count, read_bytes, write_count, write_bytes);
 312         }
 313
 314         fclose (fh);
 315 /* #endif defined(KERNEL_LINUX) */
 316
 317 #elif defined(HAVE_LIBKSTAT)
 318         static kstat_io_t kio;
 319         int i;
 320
 321         if (kc == NULL)
 322                 return;
 323
 324         for (i = 0; i < numdisk; i++)
 325         {
 326                 if (kstat_read (kc, ksp[i], &kio) == -1)
 327                         continue;
 328
 329                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 330                         disk_submit (ksp[i]->ks_name,
 331                                         kio.reads,  0LL, kio.nread,    kio.rtime,
 332                                         kio.writes, 0LL, kio.nwritten, kio.wtime);
 333                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 334                         partition_submit (ksp[i]->ks_name,
 335                                         kio.reads, kio.nread,
 336                                         kio.writes,kio.nwritten);
 337         }
 338 #endif /* defined(HAVE_LIBKSTAT) */
 339 } /* static void disk_read (void) */
 340 #else
 341 # define disk_read NULL
 342 #endif /* DISK_HAVE_READ */
 343
 344 void module_register (void)
 345 {
 346         plugin_register ("partition", NULL, NULL, partition_write);
 347         plugin_register (MODULE_NAME, disk_init, disk_read, disk_write);
 348 }
 349
 350 #undef MODULE_NAME