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