src/disk.c

   1 /**
   2  * collectd - src/disk.c
   3  * Copyright (C) 2005-2008  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; only version 2 of the License is applicable.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  17  *
  18  * Authors:
  19  *   Florian octo Forster <octo at verplant.org>
  20  **/
  21
  22 #include "collectd.h"
  23 #include "common.h"
  24 #include "plugin.h"
  25 #include "utils_ignorelist.h"
  26
  27 #if HAVE_MACH_MACH_TYPES_H
  28 #  include <mach/mach_types.h>
  29 #endif
  30 #if HAVE_MACH_MACH_INIT_H
  31 #  include <mach/mach_init.h>
  32 #endif
  33 #if HAVE_MACH_MACH_ERROR_H
  34 #  include <mach/mach_error.h>
  35 #endif
  36 #if HAVE_MACH_MACH_PORT_H
  37 #  include <mach/mach_port.h>
  38 #endif
  39 #if HAVE_COREFOUNDATION_COREFOUNDATION_H
  40 #  include <CoreFoundation/CoreFoundation.h>
  41 #endif
  42 #if HAVE_IOKIT_IOKITLIB_H
  43 #  include <IOKit/IOKitLib.h>
  44 #endif
  45 #if HAVE_IOKIT_IOTYPES_H
  46 #  include <IOKit/IOTypes.h>
  47 #endif
  48 #if HAVE_IOKIT_STORAGE_IOBLOCKSTORAGEDRIVER_H
  49 #  include <IOKit/storage/IOBlockStorageDriver.h>
  50 #endif
  51 #if HAVE_IOKIT_IOBSD_H
  52 #  include <IOKit/IOBSD.h>
  53 #endif
  54
  55 #if HAVE_LIMITS_H
  56 # include <limits.h>
  57 #endif
  58 #ifndef UINT_MAX
  59 #  define UINT_MAX 4294967295U
  60 #endif
  61
  62 #if HAVE_STATGRAB_H
  63 # include <statgrab.h>
  64 #endif
  65
  66 #if HAVE_IOKIT_IOKITLIB_H
  67 static mach_port_t io_master_port = MACH_PORT_NULL;
  68 /* #endif HAVE_IOKIT_IOKITLIB_H */
  69
  70 #elif KERNEL_LINUX
  71 typedef struct diskstats
  72 {
  73         char *name;
  74
  75         /* This overflows in roughly 1361 years */
  76         unsigned int poll_count;
  77
  78         counter_t read_sectors;
  79         counter_t write_sectors;
  80
  81         counter_t read_bytes;
  82         counter_t write_bytes;
  83
  84         counter_t read_ops;
  85         counter_t write_ops;
  86         counter_t read_time;
  87         counter_t write_time;
  88
  89         counter_t avg_read_time;
  90         counter_t avg_write_time;
  91
  92         struct diskstats *next;
  93 } diskstats_t;
  94
  95 static diskstats_t *disklist;
  96 /* #endif KERNEL_LINUX */
  97
  98 #elif HAVE_LIBKSTAT
  99 #define MAX_NUMDISK 256
 100 extern kstat_ctl_t *kc;
 101 static kstat_t *ksp[MAX_NUMDISK];
 102 static int numdisk = 0;
 103 /* #endif HAVE_LIBKSTAT */
 104
 105 #elif defined(HAVE_LIBSTATGRAB)
 106 /* #endif HAVE_LIBKSTATGRAB */
 107
 108 #else
 109 # error "No applicable input method."
 110 #endif
 111
 112 static const char *config_keys[] =
 113 {
 114         "Disk",
 115         "IgnoreSelected"
 116 };
 117 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 118
 119 static ignorelist_t *ignorelist = NULL;
 120
 121 static int disk_config (const char *key, const char *value)
 122 {
 123   if (ignorelist == NULL)
 124     ignorelist = ignorelist_create (/* invert = */ 1);
 125   if (ignorelist == NULL)
 126     return (1);
 127
 128   if (strcasecmp ("Disk", key) == 0)
 129   {
 130     ignorelist_add (ignorelist, value);
 131   }
 132   else if (strcasecmp ("IgnoreSelected", key) == 0)
 133   {
 134     int invert = 1;
 135     if ((strcasecmp ("True", value) == 0)
 136         || (strcasecmp ("Yes", value) == 0)
 137         || (strcasecmp ("On", value) == 0))
 138       invert = 0;
 139     ignorelist_set_invert (ignorelist, invert);
 140   }
 141   else
 142   {
 143     return (-1);
 144   }
 145
 146   return (0);
 147 } /* int disk_config */
 148
 149 static int disk_init (void)
 150 {
 151 #if HAVE_IOKIT_IOKITLIB_H
 152         kern_return_t status;
 153
 154         if (io_master_port != MACH_PORT_NULL)
 155         {
 156                 mach_port_deallocate (mach_task_self (),
 157                                 io_master_port);
 158                 io_master_port = MACH_PORT_NULL;
 159         }
 160
 161         status = IOMasterPort (MACH_PORT_NULL, &io_master_port);
 162         if (status != kIOReturnSuccess)
 163         {
 164                 ERROR ("IOMasterPort failed: %s",
 165                                 mach_error_string (status));
 166                 io_master_port = MACH_PORT_NULL;
 167                 return (-1);
 168         }
 169 /* #endif HAVE_IOKIT_IOKITLIB_H */
 170
 171 #elif KERNEL_LINUX
 172         /* do nothing */
 173 /* #endif KERNEL_LINUX */
 174
 175 #elif HAVE_LIBKSTAT
 176         kstat_t *ksp_chain;
 177
 178         numdisk = 0;
 179
 180         if (kc == NULL)
 181                 return (-1);
 182
 183         for (numdisk = 0, ksp_chain = kc->kc_chain;
 184                         (numdisk < MAX_NUMDISK) && (ksp_chain != NULL);
 185                         ksp_chain = ksp_chain->ks_next)
 186         {
 187                 if (strncmp (ksp_chain->ks_class, "disk", 4)
 188                                 && strncmp (ksp_chain->ks_class, "partition", 9))
 189                         continue;
 190                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
 191                         continue;
 192                 ksp[numdisk++] = ksp_chain;
 193         }
 194 #endif /* HAVE_LIBKSTAT */
 195
 196         return (0);
 197 } /* int disk_init */
 198
 199 static void disk_submit (const char *plugin_instance,
 200                 const char *type,
 201                 counter_t read, counter_t write)
 202 {
 203         value_t values[2];
 204         value_list_t vl = VALUE_LIST_INIT;
 205
 206         /* Both `ignorelist' and `plugin_instance' may be NULL. */
 207         if (ignorelist_match (ignorelist, plugin_instance) != 0)
 208           return;
 209
 210         values[0].counter = read;
 211         values[1].counter = write;
 212
 213         vl.values = values;
 214         vl.values_len = 2;
 215         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 216         sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
 217         sstrncpy (vl.plugin_instance, plugin_instance,
 218                         sizeof (vl.plugin_instance));
 219         sstrncpy (vl.type, type, sizeof (vl.type));
 220
 221         plugin_dispatch_values (&vl);
 222 } /* void disk_submit */
 223
 224 #if HAVE_IOKIT_IOKITLIB_H
 225 static signed long long dict_get_value (CFDictionaryRef dict, const char *key)
 226 {
 227         signed long long val_int;
 228         CFNumberRef      val_obj;
 229         CFStringRef      key_obj;
 230
 231         /* `key_obj' needs to be released. */
 232         key_obj = CFStringCreateWithCString (kCFAllocatorDefault, key,
 233                         kCFStringEncodingASCII);
 234         if (key_obj == NULL)
 235         {
 236                 DEBUG ("CFStringCreateWithCString (%s) failed.", key);
 237                 return (-1LL);
 238         }
 239
 240         /* get => we don't need to release (== free) the object */
 241         val_obj = (CFNumberRef) CFDictionaryGetValue (dict, key_obj);
 242
 243         CFRelease (key_obj);
 244
 245         if (val_obj == NULL)
 246         {
 247                 DEBUG ("CFDictionaryGetValue (%s) failed.", key);
 248                 return (-1LL);
 249         }
 250
 251         if (!CFNumberGetValue (val_obj, kCFNumberSInt64Type, &val_int))
 252         {
 253                 DEBUG ("CFNumberGetValue (%s) failed.", key);
 254                 return (-1LL);
 255         }
 256
 257         return (val_int);
 258 }
 259 #endif /* HAVE_IOKIT_IOKITLIB_H */
 260
 261 static int disk_read (void)
 262 {
 263 #if HAVE_IOKIT_IOKITLIB_H
 264         io_registry_entry_t     disk;
 265         io_registry_entry_t     disk_child;
 266         io_iterator_t           disk_list;
 267         CFDictionaryRef         props_dict;
 268         CFDictionaryRef         stats_dict;
 269         CFDictionaryRef         child_dict;
 270         kern_return_t           status;
 271
 272         signed long long read_ops;
 273         signed long long read_byt;
 274         signed long long read_tme;
 275         signed long long write_ops;
 276         signed long long write_byt;
 277         signed long long write_tme;
 278
 279         int  disk_major;
 280         int  disk_minor;
 281         char disk_name[64];
 282
 283         /* Get the list of all disk objects. */
 284         if (IOServiceGetMatchingServices (io_master_port,
 285                                 IOServiceMatching (kIOBlockStorageDriverClass),
 286                                 &disk_list) != kIOReturnSuccess)
 287         {
 288                 ERROR ("disk plugin: IOServiceGetMatchingServices failed.");
 289                 return (-1);
 290         }
 291
 292         while ((disk = IOIteratorNext (disk_list)) != 0)
 293         {
 294                 props_dict = NULL;
 295                 stats_dict = NULL;
 296                 child_dict = NULL;
 297
 298                 /* `disk_child' must be released */
 299                 if ((status = IORegistryEntryGetChildEntry (disk, kIOServicePlane, &disk_child))
 300                                 != kIOReturnSuccess)
 301                 {
 302                         /* This fails for example for DVD/CD drives.. */
 303                         DEBUG ("IORegistryEntryGetChildEntry (disk) failed: 0x%08x", status);
 304                         IOObjectRelease (disk);
 305                         continue;
 306                 }
 307
 308                 /* We create `props_dict' => we need to release it later */
 309                 if (IORegistryEntryCreateCFProperties (disk,
 310                                         (CFMutableDictionaryRef *) &props_dict,
 311                                         kCFAllocatorDefault,
 312                                         kNilOptions)
 313                                 != kIOReturnSuccess)
 314                 {
 315                         ERROR ("disk-plugin: IORegistryEntryCreateCFProperties failed.");
 316                         IOObjectRelease (disk_child);
 317                         IOObjectRelease (disk);
 318                         continue;
 319                 }
 320
 321                 if (props_dict == NULL)
 322                 {
 323                         DEBUG ("IORegistryEntryCreateCFProperties (disk) failed.");
 324                         IOObjectRelease (disk_child);
 325                         IOObjectRelease (disk);
 326                         continue;
 327                 }
 328
 329                 stats_dict = (CFDictionaryRef) CFDictionaryGetValue (props_dict,
 330                                 CFSTR (kIOBlockStorageDriverStatisticsKey));
 331
 332                 if (stats_dict == NULL)
 333                 {
 334                         DEBUG ("CFDictionaryGetValue (%s) failed.",
 335                                         kIOBlockStorageDriverStatisticsKey);
 336                         CFRelease (props_dict);
 337                         IOObjectRelease (disk_child);
 338                         IOObjectRelease (disk);
 339                         continue;
 340                 }
 341
 342                 if (IORegistryEntryCreateCFProperties (disk_child,
 343                                         (CFMutableDictionaryRef *) &child_dict,
 344                                         kCFAllocatorDefault,
 345                                         kNilOptions)
 346                                 != kIOReturnSuccess)
 347                 {
 348                         DEBUG ("IORegistryEntryCreateCFProperties (disk_child) failed.");
 349                         IOObjectRelease (disk_child);
 350                         CFRelease (props_dict);
 351                         IOObjectRelease (disk);
 352                         continue;
 353                 }
 354
 355                 /* kIOBSDNameKey */
 356                 disk_major = (int) dict_get_value (child_dict,
 357                                 kIOBSDMajorKey);
 358                 disk_minor = (int) dict_get_value (child_dict,
 359                                 kIOBSDMinorKey);
 360                 read_ops  = dict_get_value (stats_dict,
 361                                 kIOBlockStorageDriverStatisticsReadsKey);
 362                 read_byt  = dict_get_value (stats_dict,
 363                                 kIOBlockStorageDriverStatisticsBytesReadKey);
 364                 read_tme  = dict_get_value (stats_dict,
 365                                 kIOBlockStorageDriverStatisticsTotalReadTimeKey);
 366                 write_ops = dict_get_value (stats_dict,
 367                                 kIOBlockStorageDriverStatisticsWritesKey);
 368                 write_byt = dict_get_value (stats_dict,
 369                                 kIOBlockStorageDriverStatisticsBytesWrittenKey);
 370                 /* This property describes the number of nanoseconds spent
 371                  * performing writes since the block storage driver was
 372                  * instantiated. It is one of the statistic entries listed
 373                  * under the top-level kIOBlockStorageDriverStatisticsKey
 374                  * property table. It has an OSNumber value. */
 375                 write_tme = dict_get_value (stats_dict,
 376                                 kIOBlockStorageDriverStatisticsTotalWriteTimeKey);
 377
 378                 if (ssnprintf (disk_name, sizeof (disk_name),
 379                                 "%i-%i", disk_major, disk_minor) >= sizeof (disk_name))
 380                 {
 381                         DEBUG ("snprintf (major, minor) failed.");
 382                         CFRelease (child_dict);
 383                         IOObjectRelease (disk_child);
 384                         CFRelease (props_dict);
 385                         IOObjectRelease (disk);
 386                         continue;
 387                 }
 388                 DEBUG ("disk_name = %s", disk_name);
 389
 390                 if ((read_byt != -1LL) || (write_byt != -1LL))
 391                         disk_submit (disk_name, "disk_octets", read_byt, write_byt);
 392                 if ((read_ops != -1LL) || (write_ops != -1LL))
 393                         disk_submit (disk_name, "disk_ops", read_ops, write_ops);
 394                 if ((read_tme != -1LL) || (write_tme != -1LL))
 395                         disk_submit (disk_name, "disk_time",
 396                                         read_tme / 1000,
 397                                         write_tme / 1000);
 398
 399                 CFRelease (child_dict);
 400                 IOObjectRelease (disk_child);
 401                 CFRelease (props_dict);
 402                 IOObjectRelease (disk);
 403         }
 404         IOObjectRelease (disk_list);
 405 /* #endif HAVE_IOKIT_IOKITLIB_H */
 406
 407 #elif KERNEL_LINUX
 408         FILE *fh;
 409         char buffer[1024];
 410
 411         char *fields[32];
 412         int numfields;
 413         int fieldshift = 0;
 414
 415         int major = 0;
 416         int minor = 0;
 417
 418         counter_t read_sectors  = 0;
 419         counter_t write_sectors = 0;
 420
 421         counter_t read_ops      = 0;
 422         counter_t read_merged   = 0;
 423         counter_t read_time     = 0;
 424         counter_t write_ops     = 0;
 425         counter_t write_merged  = 0;
 426         counter_t write_time    = 0;
 427         int is_disk = 0;
 428
 429         diskstats_t *ds, *pre_ds;
 430
 431         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 432         {
 433                 fh = fopen ("/proc/partitions", "r");
 434                 if (fh == NULL)
 435                 {
 436                         ERROR ("disk plugin: fopen (/proc/{diskstats,partitions}) failed.");
 437                         return (-1);
 438                 }
 439
 440                 /* Kernel is 2.4.* */
 441                 fieldshift = 1;
 442         }
 443
 444         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 445         {
 446                 char *disk_name;
 447
 448                 numfields = strsplit (buffer, fields, 32);
 449
 450                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 451                         continue;
 452
 453                 major = atoll (fields[0]);
 454                 minor = atoll (fields[1]);
 455
 456                 disk_name = fields[2 + fieldshift];
 457
 458                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 459                         if (strcmp (disk_name, ds->name) == 0)
 460                                 break;
 461
 462                 if (ds == NULL)
 463                 {
 464                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 465                                 continue;
 466
 467                         if ((ds->name = strdup (disk_name)) == NULL)
 468                         {
 469                                 free (ds);
 470                                 continue;
 471                         }
 472
 473                         if (pre_ds == NULL)
 474                                 disklist = ds;
 475                         else
 476                                 pre_ds->next = ds;
 477                 }
 478
 479                 is_disk = 0;
 480                 if (numfields == 7)
 481                 {
 482                         /* Kernel 2.6, Partition */
 483                         read_ops      = atoll (fields[3]);
 484                         read_sectors  = atoll (fields[4]);
 485                         write_ops     = atoll (fields[5]);
 486                         write_sectors = atoll (fields[6]);
 487                 }
 488                 else if (numfields == (14 + fieldshift))
 489                 {
 490                         read_ops  =  atoll (fields[3 + fieldshift]);
 491                         write_ops =  atoll (fields[7 + fieldshift]);
 492
 493                         read_sectors  = atoll (fields[5 + fieldshift]);
 494                         write_sectors = atoll (fields[9 + fieldshift]);
 495
 496                         if ((fieldshift == 0) || (minor == 0))
 497                         {
 498                                 is_disk = 1;
 499                                 read_merged  = atoll (fields[4 + fieldshift]);
 500                                 read_time    = atoll (fields[6 + fieldshift]);
 501                                 write_merged = atoll (fields[8 + fieldshift]);
 502                                 write_time   = atoll (fields[10+ fieldshift]);
 503                         }
 504                 }
 505                 else
 506                 {
 507                         DEBUG ("numfields = %i; => unknown file format.", numfields);
 508                         continue;
 509                 }
 510
 511                 {
 512                         counter_t diff_read_sectors;
 513                         counter_t diff_write_sectors;
 514
 515                 /* If the counter wraps around, it's only 32 bits.. */
 516                         if (read_sectors < ds->read_sectors)
 517                                 diff_read_sectors = 1 + read_sectors
 518                                         + (UINT_MAX - ds->read_sectors);
 519                         else
 520                                 diff_read_sectors = read_sectors - ds->read_sectors;
 521                         if (write_sectors < ds->write_sectors)
 522                                 diff_write_sectors = 1 + write_sectors
 523                                         + (UINT_MAX - ds->write_sectors);
 524                         else
 525                                 diff_write_sectors = write_sectors - ds->write_sectors;
 526
 527                         ds->read_bytes += 512 * diff_read_sectors;
 528                         ds->write_bytes += 512 * diff_write_sectors;
 529                         ds->read_sectors = read_sectors;
 530                         ds->write_sectors = write_sectors;
 531                 }
 532
 533                 /* Calculate the average time an io-op needs to complete */
 534                 if (is_disk)
 535                 {
 536                         counter_t diff_read_ops;
 537                         counter_t diff_write_ops;
 538                         counter_t diff_read_time;
 539                         counter_t diff_write_time;
 540
 541                         if (read_ops < ds->read_ops)
 542                                 diff_read_ops = 1 + read_ops
 543                                         + (UINT_MAX - ds->read_ops);
 544                         else
 545                                 diff_read_ops = read_ops - ds->read_ops;
 546                         DEBUG ("disk plugin: disk_name = %s; read_ops = %llu; "
 547                                         "ds->read_ops = %llu; diff_read_ops = %llu;",
 548                                         disk_name,
 549                                         read_ops, ds->read_ops, diff_read_ops);
 550
 551                         if (write_ops < ds->write_ops)
 552                                 diff_write_ops = 1 + write_ops
 553                                         + (UINT_MAX - ds->write_ops);
 554                         else
 555                                 diff_write_ops = write_ops - ds->write_ops;
 556
 557                         if (read_time < ds->read_time)
 558                                 diff_read_time = 1 + read_time
 559                                         + (UINT_MAX - ds->read_time);
 560                         else
 561                                 diff_read_time = read_time - ds->read_time;
 562
 563                         if (write_time < ds->write_time)
 564                                 diff_write_time = 1 + write_time
 565                                         + (UINT_MAX - ds->write_time);
 566                         else
 567                                 diff_write_time = write_time - ds->write_time;
 568
 569                         if (diff_read_ops != 0)
 570                                 ds->avg_read_time += (diff_read_time
 571                                                 + (diff_read_ops / 2))
 572                                         / diff_read_ops;
 573                         if (diff_write_ops != 0)
 574                                 ds->avg_write_time += (diff_write_time
 575                                                 + (diff_write_ops / 2))
 576                                         / diff_write_ops;
 577
 578                         ds->read_ops = read_ops;
 579                         ds->read_time = read_time;
 580                         ds->write_ops = write_ops;
 581                         ds->write_time = write_time;
 582                 } /* if (is_disk) */
 583
 584                 /* Don't write to the RRDs if we've just started.. */
 585                 ds->poll_count++;
 586                 if (ds->poll_count <= 2)
 587                 {
 588                         DEBUG ("disk plugin: (ds->poll_count = %i) <= "
 589                                         "(min_poll_count = 2); => Not writing.",
 590                                         ds->poll_count);
 591                         continue;
 592                 }
 593
 594                 if ((read_ops == 0) && (write_ops == 0))
 595                 {
 596                         DEBUG ("disk plugin: ((read_ops == 0) && "
 597                                         "(write_ops == 0)); => Not writing.");
 598                         continue;
 599                 }
 600
 601                 if ((ds->read_bytes != 0) || (ds->write_bytes != 0))
 602                         disk_submit (disk_name, "disk_octets",
 603                                         ds->read_bytes, ds->write_bytes);
 604
 605                 if ((ds->read_ops != 0) || (ds->write_ops != 0))
 606                         disk_submit (disk_name, "disk_ops",
 607                                         read_ops, write_ops);
 608
 609                 if ((ds->avg_read_time != 0) || (ds->avg_write_time != 0))
 610                         disk_submit (disk_name, "disk_time",
 611                                         ds->avg_read_time, ds->avg_write_time);
 612
 613                 if (is_disk)
 614                 {
 615                         disk_submit (disk_name, "disk_merged",
 616                                         read_merged, write_merged);
 617                 } /* if (is_disk) */
 618         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 619
 620         fclose (fh);
 621 /* #endif defined(KERNEL_LINUX) */
 622
 623 #elif HAVE_LIBKSTAT
 624 # if HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_NWRITES && HAVE_KSTAT_IO_T_WTIME
 625 #  define KIO_ROCTETS reads
 626 #  define KIO_WOCTETS writes
 627 #  define KIO_ROPS    nreads
 628 #  define KIO_WOPS    nwrites
 629 #  define KIO_RTIME   rtime
 630 #  define KIO_WTIME   wtime
 631 # elif HAVE_KSTAT_IO_T_NWRITTEN && HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_WTIME
 632 #  define KIO_ROCTETS nread
 633 #  define KIO_WOCTETS nwritten
 634 #  define KIO_ROPS    reads
 635 #  define KIO_WOPS    writes
 636 #  define KIO_RTIME   rtime
 637 #  define KIO_WTIME   wtime
 638 # else
 639 #  error "kstat_io_t does not have the required members"
 640 # endif
 641         static kstat_io_t kio;
 642         int i;
 643
 644         if (kc == NULL)
 645                 return (-1);
 646
 647         for (i = 0; i < numdisk; i++)
 648         {
 649                 if (kstat_read (kc, ksp[i], &kio) == -1)
 650                         continue;
 651
 652                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 653                 {
 654                         disk_submit (ksp[i]->ks_name, "disk_octets",
 655                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 656                         disk_submit (ksp[i]->ks_name, "disk_ops",
 657                                         kio.KIO_ROPS, kio.KIO_WOPS);
 658                         /* FIXME: Convert this to microseconds if necessary */
 659                         disk_submit (ksp[i]->ks_name, "disk_time",
 660                                         kio.KIO_RTIME, kio.KIO_WTIME);
 661                 }
 662                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 663                 {
 664                         disk_submit (ksp[i]->ks_name, "disk_octets",
 665                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 666                         disk_submit (ksp[i]->ks_name, "disk_ops",
 667                                         kio.KIO_ROPS, kio.KIO_WOPS);
 668                 }
 669         }
 670 /* #endif defined(HAVE_LIBKSTAT) */
 671
 672 #elif defined(HAVE_LIBSTATGRAB)
 673         sg_disk_io_stats *ds;
 674         int disks, counter;
 675         char name[DATA_MAX_NAME_LEN];
 676
 677         if ((ds = sg_get_disk_io_stats(&disks)) == NULL)
 678                 return (0);
 679
 680         for (counter=0; counter < disks; counter++) {
 681                 strncpy(name, ds->disk_name, sizeof(name));
 682                 name[sizeof(name)-1] = '\0'; /* strncpy doesn't terminate longer strings */
 683                 disk_submit (name, "disk_octets", ds->read_bytes, ds->write_bytes);
 684                 ds++;
 685         }
 686 #endif /* defined(HAVE_LIBSTATGRAB) */
 687
 688         return (0);
 689 } /* int disk_read */
 690
 691 void module_register (void)
 692 {
 693   plugin_register_config ("disk", disk_config,
 694       config_keys, config_keys_num);
 695   plugin_register_init ("disk", disk_init);
 696   plugin_register_read ("disk", disk_read);
 697 } /* void module_register */