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         vl.time = time (NULL);
 216         strcpy (vl.host, hostname_g);
 217         strcpy (vl.plugin, "disk");
 218         strncpy (vl.plugin_instance, plugin_instance,
 219                         sizeof (vl.plugin_instance));
 220
 221         plugin_dispatch_values (type, &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 (snprintf (disk_name, 64, "%i-%i", disk_major, disk_minor) >= 64)
 379                 {
 380                         DEBUG ("snprintf (major, minor) failed.");
 381                         CFRelease (child_dict);
 382                         IOObjectRelease (disk_child);
 383                         CFRelease (props_dict);
 384                         IOObjectRelease (disk);
 385                         continue;
 386                 }
 387                 DEBUG ("disk_name = %s", disk_name);
 388
 389                 if ((read_byt != -1LL) || (write_byt != -1LL))
 390                         disk_submit (disk_name, "disk_octets", read_byt, write_byt);
 391                 if ((read_ops != -1LL) || (write_ops != -1LL))
 392                         disk_submit (disk_name, "disk_ops", read_ops, write_ops);
 393                 if ((read_tme != -1LL) || (write_tme != -1LL))
 394                         disk_submit (disk_name, "disk_time",
 395                                         read_tme / 1000,
 396                                         write_tme / 1000);
 397
 398                 CFRelease (child_dict);
 399                 IOObjectRelease (disk_child);
 400                 CFRelease (props_dict);
 401                 IOObjectRelease (disk);
 402         }
 403         IOObjectRelease (disk_list);
 404 /* #endif HAVE_IOKIT_IOKITLIB_H */
 405
 406 #elif KERNEL_LINUX
 407         FILE *fh;
 408         char buffer[1024];
 409
 410         char *fields[32];
 411         int numfields;
 412         int fieldshift = 0;
 413
 414         int major = 0;
 415         int minor = 0;
 416
 417         counter_t read_sectors  = 0;
 418         counter_t write_sectors = 0;
 419
 420         counter_t read_ops      = 0;
 421         counter_t read_merged   = 0;
 422         counter_t read_time     = 0;
 423         counter_t write_ops     = 0;
 424         counter_t write_merged  = 0;
 425         counter_t write_time    = 0;
 426         int is_disk = 0;
 427
 428         diskstats_t *ds, *pre_ds;
 429
 430         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 431         {
 432                 fh = fopen ("/proc/partitions", "r");
 433                 if (fh == NULL)
 434                 {
 435                         ERROR ("disk plugin: fopen (/proc/{diskstats,partitions}) failed.");
 436                         return (-1);
 437                 }
 438
 439                 /* Kernel is 2.4.* */
 440                 fieldshift = 1;
 441         }
 442
 443         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 444         {
 445                 char *disk_name;
 446
 447                 numfields = strsplit (buffer, fields, 32);
 448
 449                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 450                         continue;
 451
 452                 major = atoll (fields[0]);
 453                 minor = atoll (fields[1]);
 454
 455                 disk_name = fields[2];
 456
 457                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 458                         if (strcmp (disk_name, ds->name) == 0)
 459                                 break;
 460
 461                 if (ds == NULL)
 462                 {
 463                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 464                                 continue;
 465
 466                         if ((ds->name = strdup (disk_name)) == NULL)
 467                         {
 468                                 free (ds);
 469                                 continue;
 470                         }
 471
 472                         if (pre_ds == NULL)
 473                                 disklist = ds;
 474                         else
 475                                 pre_ds->next = ds;
 476                 }
 477
 478                 is_disk = 0;
 479                 if (numfields == 7)
 480                 {
 481                         /* Kernel 2.6, Partition */
 482                         read_ops      = atoll (fields[3]);
 483                         read_sectors  = atoll (fields[4]);
 484                         write_ops     = atoll (fields[5]);
 485                         write_sectors = atoll (fields[6]);
 486                 }
 487                 else if (numfields == (14 + fieldshift))
 488                 {
 489                         read_ops  =  atoll (fields[3 + fieldshift]);
 490                         write_ops =  atoll (fields[7 + fieldshift]);
 491
 492                         read_sectors  = atoll (fields[5 + fieldshift]);
 493                         write_sectors = atoll (fields[9 + fieldshift]);
 494
 495                         if ((fieldshift == 0) || (minor == 0))
 496                         {
 497                                 is_disk = 1;
 498                                 read_merged  = atoll (fields[4 + fieldshift]);
 499                                 read_time    = atoll (fields[6 + fieldshift]);
 500                                 write_merged = atoll (fields[8 + fieldshift]);
 501                                 write_time   = atoll (fields[10+ fieldshift]);
 502                         }
 503                 }
 504                 else
 505                 {
 506                         DEBUG ("numfields = %i; => unknown file format.", numfields);
 507                         continue;
 508                 }
 509
 510                 {
 511                         counter_t diff_read_sectors;
 512                         counter_t diff_write_sectors;
 513
 514                 /* If the counter wraps around, it's only 32 bits.. */
 515                         if (read_sectors < ds->read_sectors)
 516                                 diff_read_sectors = 1 + read_sectors
 517                                         + (UINT_MAX - ds->read_sectors);
 518                         else
 519                                 diff_read_sectors = read_sectors - ds->read_sectors;
 520                         if (write_sectors < ds->write_sectors)
 521                                 diff_write_sectors = 1 + write_sectors
 522                                         + (UINT_MAX - ds->write_sectors);
 523                         else
 524                                 diff_write_sectors = write_sectors - ds->write_sectors;
 525
 526                         ds->read_bytes += 512 * diff_read_sectors;
 527                         ds->write_bytes += 512 * diff_write_sectors;
 528                         ds->read_sectors = read_sectors;
 529                         ds->write_sectors = write_sectors;
 530                 }
 531
 532                 /* Calculate the average time an io-op needs to complete */
 533                 if (is_disk)
 534                 {
 535                         counter_t diff_read_ops;
 536                         counter_t diff_write_ops;
 537                         counter_t diff_read_time;
 538                         counter_t diff_write_time;
 539
 540                         if (read_ops < ds->read_ops)
 541                                 diff_read_ops = 1 + read_ops
 542                                         + (UINT_MAX - ds->read_ops);
 543                         else
 544                                 diff_read_ops = read_ops - ds->read_ops;
 545                         DEBUG ("disk plugin: disk_name = %s; read_ops = %llu; "
 546                                         "ds->read_ops = %llu; diff_read_ops = %llu;",
 547                                         disk_name,
 548                                         read_ops, ds->read_ops, diff_read_ops);
 549
 550                         if (write_ops < ds->write_ops)
 551                                 diff_write_ops = 1 + write_ops
 552                                         + (UINT_MAX - ds->write_ops);
 553                         else
 554                                 diff_write_ops = write_ops - ds->write_ops;
 555
 556                         if (read_time < ds->read_time)
 557                                 diff_read_time = 1 + read_time
 558                                         + (UINT_MAX - ds->read_time);
 559                         else
 560                                 diff_read_time = read_time - ds->read_time;
 561
 562                         if (write_time < ds->write_time)
 563                                 diff_write_time = 1 + write_time
 564                                         + (UINT_MAX - ds->write_time);
 565                         else
 566                                 diff_write_time = write_time - ds->write_time;
 567
 568                         if (diff_read_ops != 0)
 569                                 ds->avg_read_time += (diff_read_time
 570                                                 + (diff_read_ops / 2))
 571                                         / diff_read_ops;
 572                         if (diff_write_ops != 0)
 573                                 ds->avg_write_time += (diff_write_time
 574                                                 + (diff_write_ops / 2))
 575                                         / diff_write_ops;
 576
 577                         ds->read_ops = read_ops;
 578                         ds->read_time = read_time;
 579                         ds->write_ops = write_ops;
 580                         ds->write_time = write_time;
 581                 } /* if (is_disk) */
 582
 583                 /* Don't write to the RRDs if we've just started.. */
 584                 ds->poll_count++;
 585                 if (ds->poll_count <= 2)
 586                 {
 587                         DEBUG ("disk plugin: (ds->poll_count = %i) <= "
 588                                         "(min_poll_count = 2); => Not writing.",
 589                                         ds->poll_count);
 590                         continue;
 591                 }
 592
 593                 if ((read_ops == 0) && (write_ops == 0))
 594                 {
 595                         DEBUG ("disk plugin: ((read_ops == 0) && "
 596                                         "(write_ops == 0)); => Not writing.");
 597                         continue;
 598                 }
 599
 600                 if ((ds->read_bytes != 0) || (ds->write_bytes != 0))
 601                         disk_submit (disk_name, "disk_octets",
 602                                         ds->read_bytes, ds->write_bytes);
 603
 604                 if ((ds->read_ops != 0) || (ds->write_ops != 0))
 605                         disk_submit (disk_name, "disk_ops",
 606                                         read_ops, write_ops);
 607
 608                 if ((ds->avg_read_time != 0) || (ds->avg_write_time != 0))
 609                         disk_submit (disk_name, "disk_time",
 610                                         ds->avg_read_time, ds->avg_write_time);
 611
 612                 if (is_disk)
 613                 {
 614                         disk_submit (disk_name, "disk_merged",
 615                                         read_merged, write_merged);
 616                 } /* if (is_disk) */
 617         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 618
 619         fclose (fh);
 620 /* #endif defined(KERNEL_LINUX) */
 621
 622 #elif HAVE_LIBKSTAT
 623 # if HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_NWRITES && HAVE_KSTAT_IO_T_WTIME
 624 #  define KIO_ROCTETS reads
 625 #  define KIO_WOCTETS writes
 626 #  define KIO_ROPS    nreads
 627 #  define KIO_WOPS    nwrites
 628 #  define KIO_RTIME   rtime
 629 #  define KIO_WTIME   wtime
 630 # elif HAVE_KSTAT_IO_T_NWRITTEN && HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_WTIME
 631 #  define KIO_ROCTETS nread
 632 #  define KIO_WOCTETS nwritten
 633 #  define KIO_ROPS    reads
 634 #  define KIO_WOPS    writes
 635 #  define KIO_RTIME   rtime
 636 #  define KIO_WTIME   wtime
 637 # else
 638 #  error "kstat_io_t does not have the required members"
 639 # endif
 640         static kstat_io_t kio;
 641         int i;
 642
 643         if (kc == NULL)
 644                 return (-1);
 645
 646         for (i = 0; i < numdisk; i++)
 647         {
 648                 if (kstat_read (kc, ksp[i], &kio) == -1)
 649                         continue;
 650
 651                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 652                 {
 653                         disk_submit (ksp[i]->ks_name, "disk_octets",
 654                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 655                         disk_submit (ksp[i]->ks_name, "disk_ops",
 656                                         kio.KIO_ROPS, kio.KIO_WOPS);
 657                         /* FIXME: Convert this to microseconds if necessary */
 658                         disk_submit (ksp[i]->ks_name, "disk_time",
 659                                         kio.KIO_RTIME, kio.KIO_WTIME);
 660                 }
 661                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 662                 {
 663                         disk_submit (ksp[i]->ks_name, "disk_octets",
 664                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 665                         disk_submit (ksp[i]->ks_name, "disk_ops",
 666                                         kio.KIO_ROPS, kio.KIO_WOPS);
 667                 }
 668         }
 669 /* #endif defined(HAVE_LIBKSTAT) */
 670
 671 #elif defined(HAVE_LIBSTATGRAB)
 672         sg_disk_io_stats *ds;
 673         int disks, counter;
 674         char name[DATA_MAX_NAME_LEN];
 675
 676         if ((ds = sg_get_disk_io_stats(&disks)) == NULL)
 677                 return (0);
 678
 679         for (counter=0; counter < disks; counter++) {
 680                 strncpy(name, ds->disk_name, sizeof(name));
 681                 name[sizeof(name)-1] = '\0'; /* strncpy doesn't terminate longer strings */
 682                 disk_submit (name, "disk_octets", ds->read_bytes, ds->write_bytes);
 683                 ds++;
 684         }
 685 #endif /* defined(HAVE_LIBSTATGRAB) */
 686
 687         return (0);
 688 } /* int disk_read */
 689
 690 void module_register (void)
 691 {
 692   plugin_register_config ("disk", disk_config,
 693       config_keys, config_keys_num);
 694   plugin_register_init ("disk", disk_init);
 695   plugin_register_read ("disk", disk_read);
 696 } /* void module_register */