src/disk.c

   1 /**
   2  * collectd - src/disk.c
   3  * Copyright (C) 2005-2012  Florian octo Forster
   4  * Copyright (C) 2009       Manuel Sanmartin
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; only version 2 of the License is applicable.
   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 collectd.org>
  21  *   Manuel Sanmartin
  22  **/
  23
  24 #include "collectd.h"
  25 #include "common.h"
  26 #include "plugin.h"
  27 #include "utils_ignorelist.h"
  28
  29 #if HAVE_MACH_MACH_TYPES_H
  30 #  include <mach/mach_types.h>
  31 #endif
  32 #if HAVE_MACH_MACH_INIT_H
  33 #  include <mach/mach_init.h>
  34 #endif
  35 #if HAVE_MACH_MACH_ERROR_H
  36 #  include <mach/mach_error.h>
  37 #endif
  38 #if HAVE_MACH_MACH_PORT_H
  39 #  include <mach/mach_port.h>
  40 #endif
  41 #if HAVE_COREFOUNDATION_COREFOUNDATION_H
  42 #  include <CoreFoundation/CoreFoundation.h>
  43 #endif
  44 #if HAVE_IOKIT_IOKITLIB_H
  45 #  include <IOKit/IOKitLib.h>
  46 #endif
  47 #if HAVE_IOKIT_IOTYPES_H
  48 #  include <IOKit/IOTypes.h>
  49 #endif
  50 #if HAVE_IOKIT_STORAGE_IOBLOCKSTORAGEDRIVER_H
  51 #  include <IOKit/storage/IOBlockStorageDriver.h>
  52 #endif
  53 #if HAVE_IOKIT_IOBSD_H
  54 #  include <IOKit/IOBSD.h>
  55 #endif
  56
  57 #if HAVE_LIMITS_H
  58 # include <limits.h>
  59 #endif
  60 #ifndef UINT_MAX
  61 #  define UINT_MAX 4294967295U
  62 #endif
  63
  64 #if HAVE_STATGRAB_H
  65 # include <statgrab.h>
  66 #endif
  67
  68 #if HAVE_PERFSTAT
  69 # ifndef _AIXVERSION_610
  70 # include <sys/systemcfg.h>
  71 # endif
  72 # include <sys/protosw.h>
  73 # include <libperfstat.h>
  74 #endif
  75
  76 #if HAVE_IOKIT_IOKITLIB_H
  77 static mach_port_t io_master_port = MACH_PORT_NULL;
  78 /* This defaults to false for backwards compatibility. Please fix in the next
  79  * major version. */
  80 static _Bool use_bsd_name = 0;
  81 /* #endif HAVE_IOKIT_IOKITLIB_H */
  82
  83 #elif KERNEL_LINUX
  84 typedef struct diskstats
  85 {
  86         char *name;
  87
  88         /* This overflows in roughly 1361 years */
  89         unsigned int poll_count;
  90
  91         derive_t read_sectors;
  92         derive_t write_sectors;
  93
  94         derive_t read_bytes;
  95         derive_t write_bytes;
  96
  97         derive_t read_ops;
  98         derive_t write_ops;
  99         derive_t read_time;
 100         derive_t write_time;
 101
 102         derive_t avg_read_time;
 103         derive_t avg_write_time;
 104
 105         struct diskstats *next;
 106 } diskstats_t;
 107
 108 static diskstats_t *disklist;
 109 /* #endif KERNEL_LINUX */
 110
 111 #elif HAVE_LIBKSTAT
 112 #define MAX_NUMDISK 1024
 113 extern kstat_ctl_t *kc;
 114 static kstat_t *ksp[MAX_NUMDISK];
 115 static int numdisk = 0;
 116 /* #endif HAVE_LIBKSTAT */
 117
 118 #elif defined(HAVE_LIBSTATGRAB)
 119 /* #endif HAVE_LIBKSTATGRAB */
 120
 121 #elif HAVE_PERFSTAT
 122 static perfstat_disk_t * stat_disk;
 123 static int numdisk;
 124 static int pnumdisk;
 125 /* #endif HAVE_PERFSTAT */
 126
 127 #else
 128 # error "No applicable input method."
 129 #endif
 130
 131 static const char *config_keys[] =
 132 {
 133         "Disk",
 134         "UseBSDName",
 135         "IgnoreSelected"
 136 };
 137 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 138
 139 static ignorelist_t *ignorelist = NULL;
 140
 141 static int disk_config (const char *key, const char *value)
 142 {
 143   if (ignorelist == NULL)
 144     ignorelist = ignorelist_create (/* invert = */ 1);
 145   if (ignorelist == NULL)
 146     return (1);
 147
 148   if (strcasecmp ("Disk", key) == 0)
 149   {
 150     ignorelist_add (ignorelist, value);
 151   }
 152   else if (strcasecmp ("IgnoreSelected", key) == 0)
 153   {
 154     int invert = 1;
 155     if (IS_TRUE (value))
 156       invert = 0;
 157     ignorelist_set_invert (ignorelist, invert);
 158   }
 159   else if (strcasecmp ("UseBSDName", key) == 0)
 160   {
 161 #if HAVE_IOKIT_IOKITLIB_H
 162     use_bsd_name = IS_TRUE (value) ? 1 : 0;
 163 #else
 164     WARNING ("disk plugin: The \"UseBSDName\" option is only supported "
 165         "on Mach / Mac OS X and will be ignored.");
 166 #endif
 167   }
 168   else
 169   {
 170     return (-1);
 171   }
 172
 173   return (0);
 174 } /* int disk_config */
 175
 176 static int disk_init (void)
 177 {
 178 #if HAVE_IOKIT_IOKITLIB_H
 179         kern_return_t status;
 180
 181         if (io_master_port != MACH_PORT_NULL)
 182         {
 183                 mach_port_deallocate (mach_task_self (),
 184                                 io_master_port);
 185                 io_master_port = MACH_PORT_NULL;
 186         }
 187
 188         status = IOMasterPort (MACH_PORT_NULL, &io_master_port);
 189         if (status != kIOReturnSuccess)
 190         {
 191                 ERROR ("IOMasterPort failed: %s",
 192                                 mach_error_string (status));
 193                 io_master_port = MACH_PORT_NULL;
 194                 return (-1);
 195         }
 196 /* #endif HAVE_IOKIT_IOKITLIB_H */
 197
 198 #elif KERNEL_LINUX
 199         /* do nothing */
 200 /* #endif KERNEL_LINUX */
 201
 202 #elif HAVE_LIBKSTAT
 203         kstat_t *ksp_chain;
 204
 205         numdisk = 0;
 206
 207         if (kc == NULL)
 208                 return (-1);
 209
 210         for (numdisk = 0, ksp_chain = kc->kc_chain;
 211                         (numdisk < MAX_NUMDISK) && (ksp_chain != NULL);
 212                         ksp_chain = ksp_chain->ks_next)
 213         {
 214                 if (strncmp (ksp_chain->ks_class, "disk", 4)
 215                                 && strncmp (ksp_chain->ks_class, "partition", 9))
 216                         continue;
 217                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
 218                         continue;
 219                 ksp[numdisk++] = ksp_chain;
 220         }
 221 #endif /* HAVE_LIBKSTAT */
 222
 223         return (0);
 224 } /* int disk_init */
 225
 226 static void disk_submit (const char *plugin_instance,
 227                 const char *type,
 228                 derive_t read, derive_t write)
 229 {
 230         value_t values[2];
 231         value_list_t vl = VALUE_LIST_INIT;
 232
 233         /* Both `ignorelist' and `plugin_instance' may be NULL. */
 234         if (ignorelist_match (ignorelist, plugin_instance) != 0)
 235           return;
 236
 237         values[0].derive = read;
 238         values[1].derive = write;
 239
 240         vl.values = values;
 241         vl.values_len = 2;
 242         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 243         sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
 244         sstrncpy (vl.plugin_instance, plugin_instance,
 245                         sizeof (vl.plugin_instance));
 246         sstrncpy (vl.type, type, sizeof (vl.type));
 247
 248         plugin_dispatch_values (&vl);
 249 } /* void disk_submit */
 250
 251 #if KERNEL_LINUX
 252 static counter_t disk_calc_time_incr (counter_t delta_time, counter_t delta_ops)
 253 {
 254         double interval = CDTIME_T_TO_DOUBLE (plugin_get_interval ());
 255         double avg_time = ((double) delta_time) / ((double) delta_ops);
 256         double avg_time_incr = interval * avg_time;
 257
 258         return ((counter_t) (avg_time_incr + .5));
 259 }
 260 #endif
 261
 262 #if HAVE_IOKIT_IOKITLIB_H
 263 static signed long long dict_get_value (CFDictionaryRef dict, const char *key)
 264 {
 265         signed long long val_int;
 266         CFNumberRef      val_obj;
 267         CFStringRef      key_obj;
 268
 269         /* `key_obj' needs to be released. */
 270         key_obj = CFStringCreateWithCString (kCFAllocatorDefault, key,
 271                         kCFStringEncodingASCII);
 272         if (key_obj == NULL)
 273         {
 274                 DEBUG ("CFStringCreateWithCString (%s) failed.", key);
 275                 return (-1LL);
 276         }
 277
 278         /* get => we don't need to release (== free) the object */
 279         val_obj = (CFNumberRef) CFDictionaryGetValue (dict, key_obj);
 280
 281         CFRelease (key_obj);
 282
 283         if (val_obj == NULL)
 284         {
 285                 DEBUG ("CFDictionaryGetValue (%s) failed.", key);
 286                 return (-1LL);
 287         }
 288
 289         if (!CFNumberGetValue (val_obj, kCFNumberSInt64Type, &val_int))
 290         {
 291                 DEBUG ("CFNumberGetValue (%s) failed.", key);
 292                 return (-1LL);
 293         }
 294
 295         return (val_int);
 296 }
 297 #endif /* HAVE_IOKIT_IOKITLIB_H */
 298
 299 static int disk_read (void)
 300 {
 301 #if HAVE_IOKIT_IOKITLIB_H
 302         io_registry_entry_t     disk;
 303         io_registry_entry_t     disk_child;
 304         io_iterator_t           disk_list;
 305         CFDictionaryRef         props_dict;
 306         CFDictionaryRef         stats_dict;
 307         CFDictionaryRef         child_dict;
 308         CFStringRef             tmp_cf_string_ref;
 309         kern_return_t           status;
 310
 311         signed long long read_ops;
 312         signed long long read_byt;
 313         signed long long read_tme;
 314         signed long long write_ops;
 315         signed long long write_byt;
 316         signed long long write_tme;
 317
 318         int  disk_major;
 319         int  disk_minor;
 320         char disk_name[DATA_MAX_NAME_LEN];
 321         char disk_name_bsd[DATA_MAX_NAME_LEN];
 322
 323         /* Get the list of all disk objects. */
 324         if (IOServiceGetMatchingServices (io_master_port,
 325                                 IOServiceMatching (kIOBlockStorageDriverClass),
 326                                 &disk_list) != kIOReturnSuccess)
 327         {
 328                 ERROR ("disk plugin: IOServiceGetMatchingServices failed.");
 329                 return (-1);
 330         }
 331
 332         while ((disk = IOIteratorNext (disk_list)) != 0)
 333         {
 334                 props_dict = NULL;
 335                 stats_dict = NULL;
 336                 child_dict = NULL;
 337
 338                 /* `disk_child' must be released */
 339                 if ((status = IORegistryEntryGetChildEntry (disk, kIOServicePlane, &disk_child))
 340                                 != kIOReturnSuccess)
 341                 {
 342                         /* This fails for example for DVD/CD drives.. */
 343                         DEBUG ("IORegistryEntryGetChildEntry (disk) failed: 0x%08x", status);
 344                         IOObjectRelease (disk);
 345                         continue;
 346                 }
 347
 348                 /* We create `props_dict' => we need to release it later */
 349                 if (IORegistryEntryCreateCFProperties (disk,
 350                                         (CFMutableDictionaryRef *) &props_dict,
 351                                         kCFAllocatorDefault,
 352                                         kNilOptions)
 353                                 != kIOReturnSuccess)
 354                 {
 355                         ERROR ("disk-plugin: IORegistryEntryCreateCFProperties failed.");
 356                         IOObjectRelease (disk_child);
 357                         IOObjectRelease (disk);
 358                         continue;
 359                 }
 360
 361                 if (props_dict == NULL)
 362                 {
 363                         DEBUG ("IORegistryEntryCreateCFProperties (disk) failed.");
 364                         IOObjectRelease (disk_child);
 365                         IOObjectRelease (disk);
 366                         continue;
 367                 }
 368
 369                 /* tmp_cf_string_ref doesn't need to be released. */
 370                 tmp_cf_string_ref = (CFStringRef) CFDictionaryGetValue (props_dict,
 371                                 CFSTR(kIOBSDNameKey));
 372                 if (!tmp_cf_string_ref)
 373                 {
 374                         DEBUG ("disk plugin: CFDictionaryGetValue("
 375                                         "kIOBSDNameKey) failed.");
 376                         CFRelease (props_dict);
 377                         IOObjectRelease (disk_child);
 378                         IOObjectRelease (disk);
 379                         continue;
 380                 }
 381                 assert (CFGetTypeID (tmp_cf_string_ref) == CFStringGetTypeID ());
 382
 383                 memset (disk_name_bsd, 0, sizeof (disk_name_bsd));
 384                 CFStringGetCString (tmp_cf_string_ref,
 385                                 disk_name_bsd, sizeof (disk_name_bsd),
 386                                 kCFStringEncodingUTF8);
 387                 if (disk_name_bsd[0] == 0)
 388                 {
 389                         ERROR ("disk plugin: CFStringGetCString() failed.");
 390                         CFRelease (props_dict);
 391                         IOObjectRelease (disk_child);
 392                         IOObjectRelease (disk);
 393                         continue;
 394                 }
 395                 DEBUG ("disk plugin: disk_name_bsd = \"%s\"", disk_name_bsd);
 396
 397                 stats_dict = (CFDictionaryRef) CFDictionaryGetValue (props_dict,
 398                                 CFSTR (kIOBlockStorageDriverStatisticsKey));
 399
 400                 if (stats_dict == NULL)
 401                 {
 402                         DEBUG ("disk plugin: CFDictionaryGetValue ("
 403                                         "%s) failed.",
 404                                         kIOBlockStorageDriverStatisticsKey);
 405                         CFRelease (props_dict);
 406                         IOObjectRelease (disk_child);
 407                         IOObjectRelease (disk);
 408                         continue;
 409                 }
 410
 411                 if (IORegistryEntryCreateCFProperties (disk_child,
 412                                         (CFMutableDictionaryRef *) &child_dict,
 413                                         kCFAllocatorDefault,
 414                                         kNilOptions)
 415                                 != kIOReturnSuccess)
 416                 {
 417                         DEBUG ("disk plugin: IORegistryEntryCreateCFProperties ("
 418                                         "disk_child) failed.");
 419                         IOObjectRelease (disk_child);
 420                         CFRelease (props_dict);
 421                         IOObjectRelease (disk);
 422                         continue;
 423                 }
 424
 425                 /* kIOBSDNameKey */
 426                 disk_major = (int) dict_get_value (child_dict,
 427                                 kIOBSDMajorKey);
 428                 disk_minor = (int) dict_get_value (child_dict,
 429                                 kIOBSDMinorKey);
 430                 read_ops  = dict_get_value (stats_dict,
 431                                 kIOBlockStorageDriverStatisticsReadsKey);
 432                 read_byt  = dict_get_value (stats_dict,
 433                                 kIOBlockStorageDriverStatisticsBytesReadKey);
 434                 read_tme  = dict_get_value (stats_dict,
 435                                 kIOBlockStorageDriverStatisticsTotalReadTimeKey);
 436                 write_ops = dict_get_value (stats_dict,
 437                                 kIOBlockStorageDriverStatisticsWritesKey);
 438                 write_byt = dict_get_value (stats_dict,
 439                                 kIOBlockStorageDriverStatisticsBytesWrittenKey);
 440                 /* This property describes the number of nanoseconds spent
 441                  * performing writes since the block storage driver was
 442                  * instantiated. It is one of the statistic entries listed
 443                  * under the top-level kIOBlockStorageDriverStatisticsKey
 444                  * property table. It has an OSNumber value. */
 445                 write_tme = dict_get_value (stats_dict,
 446                                 kIOBlockStorageDriverStatisticsTotalWriteTimeKey);
 447
 448                 if (use_bsd_name)
 449                         sstrncpy (disk_name, disk_name_bsd, sizeof (disk_name));
 450                 else
 451                         ssnprintf (disk_name, sizeof (disk_name), "%i-%i",
 452                                         disk_major, disk_minor);
 453                 DEBUG ("disk plugin: disk_name = \"%s\"", disk_name);
 454
 455                 if ((read_byt != -1LL) || (write_byt != -1LL))
 456                         disk_submit (disk_name, "disk_octets", read_byt, write_byt);
 457                 if ((read_ops != -1LL) || (write_ops != -1LL))
 458                         disk_submit (disk_name, "disk_ops", read_ops, write_ops);
 459                 if ((read_tme != -1LL) || (write_tme != -1LL))
 460                         disk_submit (disk_name, "disk_time",
 461                                         read_tme / 1000,
 462                                         write_tme / 1000);
 463
 464                 CFRelease (child_dict);
 465                 IOObjectRelease (disk_child);
 466                 CFRelease (props_dict);
 467                 IOObjectRelease (disk);
 468         }
 469         IOObjectRelease (disk_list);
 470 /* #endif HAVE_IOKIT_IOKITLIB_H */
 471
 472 #elif KERNEL_LINUX
 473         FILE *fh;
 474         char buffer[1024];
 475
 476         char *fields[32];
 477         int numfields;
 478         int fieldshift = 0;
 479
 480         int minor = 0;
 481
 482         derive_t read_sectors  = 0;
 483         derive_t write_sectors = 0;
 484
 485         derive_t read_ops      = 0;
 486         derive_t read_merged   = 0;
 487         derive_t read_time     = 0;
 488         derive_t write_ops     = 0;
 489         derive_t write_merged  = 0;
 490         derive_t write_time    = 0;
 491         int is_disk = 0;
 492
 493         diskstats_t *ds, *pre_ds;
 494
 495         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 496         {
 497                 fh = fopen ("/proc/partitions", "r");
 498                 if (fh == NULL)
 499                 {
 500                         ERROR ("disk plugin: fopen (/proc/{diskstats,partitions}) failed.");
 501                         return (-1);
 502                 }
 503
 504                 /* Kernel is 2.4.* */
 505                 fieldshift = 1;
 506         }
 507
 508         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 509         {
 510                 char *disk_name;
 511
 512                 numfields = strsplit (buffer, fields, 32);
 513
 514                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 515                         continue;
 516
 517                 minor = atoll (fields[1]);
 518
 519                 disk_name = fields[2 + fieldshift];
 520
 521                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 522                         if (strcmp (disk_name, ds->name) == 0)
 523                                 break;
 524
 525                 if (ds == NULL)
 526                 {
 527                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 528                                 continue;
 529
 530                         if ((ds->name = strdup (disk_name)) == NULL)
 531                         {
 532                                 free (ds);
 533                                 continue;
 534                         }
 535
 536                         if (pre_ds == NULL)
 537                                 disklist = ds;
 538                         else
 539                                 pre_ds->next = ds;
 540                 }
 541
 542                 is_disk = 0;
 543                 if (numfields == 7)
 544                 {
 545                         /* Kernel 2.6, Partition */
 546                         read_ops      = atoll (fields[3]);
 547                         read_sectors  = atoll (fields[4]);
 548                         write_ops     = atoll (fields[5]);
 549                         write_sectors = atoll (fields[6]);
 550                 }
 551                 else if (numfields == (14 + fieldshift))
 552                 {
 553                         read_ops  =  atoll (fields[3 + fieldshift]);
 554                         write_ops =  atoll (fields[7 + fieldshift]);
 555
 556                         read_sectors  = atoll (fields[5 + fieldshift]);
 557                         write_sectors = atoll (fields[9 + fieldshift]);
 558
 559                         if ((fieldshift == 0) || (minor == 0))
 560                         {
 561                                 is_disk = 1;
 562                                 read_merged  = atoll (fields[4 + fieldshift]);
 563                                 read_time    = atoll (fields[6 + fieldshift]);
 564                                 write_merged = atoll (fields[8 + fieldshift]);
 565                                 write_time   = atoll (fields[10+ fieldshift]);
 566                         }
 567                 }
 568                 else
 569                 {
 570                         DEBUG ("numfields = %i; => unknown file format.", numfields);
 571                         continue;
 572                 }
 573
 574                 {
 575                         derive_t diff_read_sectors;
 576                         derive_t diff_write_sectors;
 577
 578                 /* If the counter wraps around, it's only 32 bits.. */
 579                         if (read_sectors < ds->read_sectors)
 580                                 diff_read_sectors = 1 + read_sectors
 581                                         + (UINT_MAX - ds->read_sectors);
 582                         else
 583                                 diff_read_sectors = read_sectors - ds->read_sectors;
 584                         if (write_sectors < ds->write_sectors)
 585                                 diff_write_sectors = 1 + write_sectors
 586                                         + (UINT_MAX - ds->write_sectors);
 587                         else
 588                                 diff_write_sectors = write_sectors - ds->write_sectors;
 589
 590                         ds->read_bytes += 512 * diff_read_sectors;
 591                         ds->write_bytes += 512 * diff_write_sectors;
 592                         ds->read_sectors = read_sectors;
 593                         ds->write_sectors = write_sectors;
 594                 }
 595
 596                 /* Calculate the average time an io-op needs to complete */
 597                 if (is_disk)
 598                 {
 599                         derive_t diff_read_ops;
 600                         derive_t diff_write_ops;
 601                         derive_t diff_read_time;
 602                         derive_t diff_write_time;
 603
 604                         if (read_ops < ds->read_ops)
 605                                 diff_read_ops = 1 + read_ops
 606                                         + (UINT_MAX - ds->read_ops);
 607                         else
 608                                 diff_read_ops = read_ops - ds->read_ops;
 609                         DEBUG ("disk plugin: disk_name = %s; read_ops = %"PRIi64"; "
 610                                         "ds->read_ops = %"PRIi64"; diff_read_ops = %"PRIi64";",
 611                                         disk_name,
 612                                         read_ops, ds->read_ops, diff_read_ops);
 613
 614                         if (write_ops < ds->write_ops)
 615                                 diff_write_ops = 1 + write_ops
 616                                         + (UINT_MAX - ds->write_ops);
 617                         else
 618                                 diff_write_ops = write_ops - ds->write_ops;
 619
 620                         if (read_time < ds->read_time)
 621                                 diff_read_time = 1 + read_time
 622                                         + (UINT_MAX - ds->read_time);
 623                         else
 624                                 diff_read_time = read_time - ds->read_time;
 625
 626                         if (write_time < ds->write_time)
 627                                 diff_write_time = 1 + write_time
 628                                         + (UINT_MAX - ds->write_time);
 629                         else
 630                                 diff_write_time = write_time - ds->write_time;
 631
 632                         if (diff_read_ops != 0)
 633                                 ds->avg_read_time += disk_calc_time_incr (
 634                                                 diff_read_time, diff_read_ops);
 635                         if (diff_write_ops != 0)
 636                                 ds->avg_write_time += disk_calc_time_incr (
 637                                                 diff_write_time, diff_write_ops);
 638
 639                         ds->read_ops = read_ops;
 640                         ds->read_time = read_time;
 641                         ds->write_ops = write_ops;
 642                         ds->write_time = write_time;
 643                 } /* if (is_disk) */
 644
 645                 /* Don't write to the RRDs if we've just started.. */
 646                 ds->poll_count++;
 647                 if (ds->poll_count <= 2)
 648                 {
 649                         DEBUG ("disk plugin: (ds->poll_count = %i) <= "
 650                                         "(min_poll_count = 2); => Not writing.",
 651                                         ds->poll_count);
 652                         continue;
 653                 }
 654
 655                 if ((read_ops == 0) && (write_ops == 0))
 656                 {
 657                         DEBUG ("disk plugin: ((read_ops == 0) && "
 658                                         "(write_ops == 0)); => Not writing.");
 659                         continue;
 660                 }
 661
 662                 if ((ds->read_bytes != 0) || (ds->write_bytes != 0))
 663                         disk_submit (disk_name, "disk_octets",
 664                                         ds->read_bytes, ds->write_bytes);
 665
 666                 if ((ds->read_ops != 0) || (ds->write_ops != 0))
 667                         disk_submit (disk_name, "disk_ops",
 668                                         read_ops, write_ops);
 669
 670                 if ((ds->avg_read_time != 0) || (ds->avg_write_time != 0))
 671                         disk_submit (disk_name, "disk_time",
 672                                         ds->avg_read_time, ds->avg_write_time);
 673
 674                 if (is_disk)
 675                 {
 676                         disk_submit (disk_name, "disk_merged",
 677                                         read_merged, write_merged);
 678                 } /* if (is_disk) */
 679         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 680
 681         fclose (fh);
 682 /* #endif defined(KERNEL_LINUX) */
 683
 684 #elif HAVE_LIBKSTAT
 685 # if HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_NWRITES && HAVE_KSTAT_IO_T_WTIME
 686 #  define KIO_ROCTETS reads
 687 #  define KIO_WOCTETS writes
 688 #  define KIO_ROPS    nreads
 689 #  define KIO_WOPS    nwrites
 690 #  define KIO_RTIME   rtime
 691 #  define KIO_WTIME   wtime
 692 # elif HAVE_KSTAT_IO_T_NWRITTEN && HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_WTIME
 693 #  define KIO_ROCTETS nread
 694 #  define KIO_WOCTETS nwritten
 695 #  define KIO_ROPS    reads
 696 #  define KIO_WOPS    writes
 697 #  define KIO_RTIME   rtime
 698 #  define KIO_WTIME   wtime
 699 # else
 700 #  error "kstat_io_t does not have the required members"
 701 # endif
 702         static kstat_io_t kio;
 703         int i;
 704
 705         if (kc == NULL)
 706                 return (-1);
 707
 708         for (i = 0; i < numdisk; i++)
 709         {
 710                 if (kstat_read (kc, ksp[i], &kio) == -1)
 711                         continue;
 712
 713                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 714                 {
 715                         disk_submit (ksp[i]->ks_name, "disk_octets",
 716                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 717                         disk_submit (ksp[i]->ks_name, "disk_ops",
 718                                         kio.KIO_ROPS, kio.KIO_WOPS);
 719                         /* FIXME: Convert this to microseconds if necessary */
 720                         disk_submit (ksp[i]->ks_name, "disk_time",
 721                                         kio.KIO_RTIME, kio.KIO_WTIME);
 722                 }
 723                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 724                 {
 725                         disk_submit (ksp[i]->ks_name, "disk_octets",
 726                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 727                         disk_submit (ksp[i]->ks_name, "disk_ops",
 728                                         kio.KIO_ROPS, kio.KIO_WOPS);
 729                 }
 730         }
 731 /* #endif defined(HAVE_LIBKSTAT) */
 732
 733 #elif defined(HAVE_LIBSTATGRAB)
 734         sg_disk_io_stats *ds;
 735         int disks, counter;
 736         char name[DATA_MAX_NAME_LEN];
 737
 738         if ((ds = sg_get_disk_io_stats(&disks)) == NULL)
 739                 return (0);
 740
 741         for (counter=0; counter < disks; counter++) {
 742                 strncpy(name, ds->disk_name, sizeof(name));
 743                 name[sizeof(name)-1] = '\0'; /* strncpy doesn't terminate longer strings */
 744                 disk_submit (name, "disk_octets", ds->read_bytes, ds->write_bytes);
 745                 ds++;
 746         }
 747 /* #endif defined(HAVE_LIBSTATGRAB) */
 748
 749 #elif defined(HAVE_PERFSTAT)
 750         derive_t read_sectors;
 751         derive_t write_sectors;
 752         derive_t read_time;
 753         derive_t write_time;
 754         derive_t read_ops;
 755         derive_t write_ops;
 756         perfstat_id_t firstpath;
 757         int rnumdisk;
 758         int i;
 759
 760         if ((numdisk = perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0)) < 0)
 761         {
 762                 char errbuf[1024];
 763                 WARNING ("disk plugin: perfstat_disk: %s",
 764                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 765                 return (-1);
 766         }
 767
 768         if (numdisk != pnumdisk || stat_disk==NULL) {
 769                 if (stat_disk!=NULL)
 770                         free(stat_disk);
 771                 stat_disk = (perfstat_disk_t *)calloc(numdisk, sizeof(perfstat_disk_t));
 772         }
 773         pnumdisk = numdisk;
 774
 775         firstpath.name[0]='\0';
 776         if ((rnumdisk = perfstat_disk(&firstpath, stat_disk, sizeof(perfstat_disk_t), numdisk)) < 0)
 777         {
 778                 char errbuf[1024];
 779                 WARNING ("disk plugin: perfstat_disk : %s",
 780                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 781                 return (-1);
 782         }
 783
 784         for (i = 0; i < rnumdisk; i++)
 785         {
 786                 read_sectors = stat_disk[i].rblks*stat_disk[i].bsize;
 787                 write_sectors = stat_disk[i].wblks*stat_disk[i].bsize;
 788                 disk_submit (stat_disk[i].name, "disk_octets", read_sectors, write_sectors);
 789
 790                 read_ops = stat_disk[i].xrate;
 791                 write_ops = stat_disk[i].xfers - stat_disk[i].xrate;
 792                 disk_submit (stat_disk[i].name, "disk_ops", read_ops, write_ops);
 793
 794                 read_time = stat_disk[i].rserv;
 795                 read_time *= ((double)(_system_configuration.Xint)/(double)(_system_configuration.Xfrac)) / 1000000.0;
 796                 write_time = stat_disk[i].wserv;
 797                 write_time *= ((double)(_system_configuration.Xint)/(double)(_system_configuration.Xfrac)) / 1000000.0;
 798                 disk_submit (stat_disk[i].name, "disk_time", read_time, write_time);
 799         }
 800 #endif /* defined(HAVE_PERFSTAT) */
 801
 802         return (0);
 803 } /* int disk_read */
 804
 805 void module_register (void)
 806 {
 807   plugin_register_config ("disk", disk_config,
 808       config_keys, config_keys_num);
 809   plugin_register_init ("disk", disk_init);
 810   plugin_register_read ("disk", disk_read);
 811 } /* void module_register */