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         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 217         sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
 218         sstrncpy (vl.plugin_instance, plugin_instance,
 219                         sizeof (vl.plugin_instance));
 220         sstrncpy (vl.type, type, sizeof (vl.type));
 221
 222         plugin_dispatch_values (&vl);
 223 } /* void disk_submit */
 224
 225 #if HAVE_IOKIT_IOKITLIB_H
 226 static signed long long dict_get_value (CFDictionaryRef dict, const char *key)
 227 {
 228         signed long long val_int;
 229         CFNumberRef      val_obj;
 230         CFStringRef      key_obj;
 231
 232         /* `key_obj' needs to be released. */
 233         key_obj = CFStringCreateWithCString (kCFAllocatorDefault, key,
 234                         kCFStringEncodingASCII);
 235         if (key_obj == NULL)
 236         {
 237                 DEBUG ("CFStringCreateWithCString (%s) failed.", key);
 238                 return (-1LL);
 239         }
 240
 241         /* get => we don't need to release (== free) the object */
 242         val_obj = (CFNumberRef) CFDictionaryGetValue (dict, key_obj);
 243
 244         CFRelease (key_obj);
 245
 246         if (val_obj == NULL)
 247         {
 248                 DEBUG ("CFDictionaryGetValue (%s) failed.", key);
 249                 return (-1LL);
 250         }
 251
 252         if (!CFNumberGetValue (val_obj, kCFNumberSInt64Type, &val_int))
 253         {
 254                 DEBUG ("CFNumberGetValue (%s) failed.", key);
 255                 return (-1LL);
 256         }
 257
 258         return (val_int);
 259 }
 260 #endif /* HAVE_IOKIT_IOKITLIB_H */
 261
 262 static int disk_read (void)
 263 {
 264 #if HAVE_IOKIT_IOKITLIB_H
 265         io_registry_entry_t     disk;
 266         io_registry_entry_t     disk_child;
 267         io_iterator_t           disk_list;
 268         CFDictionaryRef         props_dict;
 269         CFDictionaryRef         stats_dict;
 270         CFDictionaryRef         child_dict;
 271         kern_return_t           status;
 272
 273         signed long long read_ops;
 274         signed long long read_byt;
 275         signed long long read_tme;
 276         signed long long write_ops;
 277         signed long long write_byt;
 278         signed long long write_tme;
 279
 280         int  disk_major;
 281         int  disk_minor;
 282         char disk_name[64];
 283
 284         /* Get the list of all disk objects. */
 285         if (IOServiceGetMatchingServices (io_master_port,
 286                                 IOServiceMatching (kIOBlockStorageDriverClass),
 287                                 &disk_list) != kIOReturnSuccess)
 288         {
 289                 ERROR ("disk plugin: IOServiceGetMatchingServices failed.");
 290                 return (-1);
 291         }
 292
 293         while ((disk = IOIteratorNext (disk_list)) != 0)
 294         {
 295                 props_dict = NULL;
 296                 stats_dict = NULL;
 297                 child_dict = NULL;
 298
 299                 /* `disk_child' must be released */
 300                 if ((status = IORegistryEntryGetChildEntry (disk, kIOServicePlane, &disk_child))
 301                                 != kIOReturnSuccess)
 302                 {
 303                         /* This fails for example for DVD/CD drives.. */
 304                         DEBUG ("IORegistryEntryGetChildEntry (disk) failed: 0x%08x", status);
 305                         IOObjectRelease (disk);
 306                         continue;
 307                 }
 308
 309                 /* We create `props_dict' => we need to release it later */
 310                 if (IORegistryEntryCreateCFProperties (disk,
 311                                         (CFMutableDictionaryRef *) &props_dict,
 312                                         kCFAllocatorDefault,
 313                                         kNilOptions)
 314                                 != kIOReturnSuccess)
 315                 {
 316                         ERROR ("disk-plugin: IORegistryEntryCreateCFProperties failed.");
 317                         IOObjectRelease (disk_child);
 318                         IOObjectRelease (disk);
 319                         continue;
 320                 }
 321
 322                 if (props_dict == NULL)
 323                 {
 324                         DEBUG ("IORegistryEntryCreateCFProperties (disk) failed.");
 325                         IOObjectRelease (disk_child);
 326                         IOObjectRelease (disk);
 327                         continue;
 328                 }
 329
 330                 stats_dict = (CFDictionaryRef) CFDictionaryGetValue (props_dict,
 331                                 CFSTR (kIOBlockStorageDriverStatisticsKey));
 332
 333                 if (stats_dict == NULL)
 334                 {
 335                         DEBUG ("CFDictionaryGetValue (%s) failed.",
 336                                         kIOBlockStorageDriverStatisticsKey);
 337                         CFRelease (props_dict);
 338                         IOObjectRelease (disk_child);
 339                         IOObjectRelease (disk);
 340                         continue;
 341                 }
 342
 343                 if (IORegistryEntryCreateCFProperties (disk_child,
 344                                         (CFMutableDictionaryRef *) &child_dict,
 345                                         kCFAllocatorDefault,
 346                                         kNilOptions)
 347                                 != kIOReturnSuccess)
 348                 {
 349                         DEBUG ("IORegistryEntryCreateCFProperties (disk_child) failed.");
 350                         IOObjectRelease (disk_child);
 351                         CFRelease (props_dict);
 352                         IOObjectRelease (disk);
 353                         continue;
 354                 }
 355
 356                 /* kIOBSDNameKey */
 357                 disk_major = (int) dict_get_value (child_dict,
 358                                 kIOBSDMajorKey);
 359                 disk_minor = (int) dict_get_value (child_dict,
 360                                 kIOBSDMinorKey);
 361                 read_ops  = dict_get_value (stats_dict,
 362                                 kIOBlockStorageDriverStatisticsReadsKey);
 363                 read_byt  = dict_get_value (stats_dict,
 364                                 kIOBlockStorageDriverStatisticsBytesReadKey);
 365                 read_tme  = dict_get_value (stats_dict,
 366                                 kIOBlockStorageDriverStatisticsTotalReadTimeKey);
 367                 write_ops = dict_get_value (stats_dict,
 368                                 kIOBlockStorageDriverStatisticsWritesKey);
 369                 write_byt = dict_get_value (stats_dict,
 370                                 kIOBlockStorageDriverStatisticsBytesWrittenKey);
 371                 /* This property describes the number of nanoseconds spent
 372                  * performing writes since the block storage driver was
 373                  * instantiated. It is one of the statistic entries listed
 374                  * under the top-level kIOBlockStorageDriverStatisticsKey
 375                  * property table. It has an OSNumber value. */
 376                 write_tme = dict_get_value (stats_dict,
 377                                 kIOBlockStorageDriverStatisticsTotalWriteTimeKey);
 378
 379                 if (ssnprintf (disk_name, sizeof (disk_name),
 380                                 "%i-%i", disk_major, disk_minor) >= sizeof (disk_name))
 381                 {
 382                         DEBUG ("snprintf (major, minor) failed.");
 383                         CFRelease (child_dict);
 384                         IOObjectRelease (disk_child);
 385                         CFRelease (props_dict);
 386                         IOObjectRelease (disk);
 387                         continue;
 388                 }
 389                 DEBUG ("disk_name = %s", disk_name);
 390
 391                 if ((read_byt != -1LL) || (write_byt != -1LL))
 392                         disk_submit (disk_name, "disk_octets", read_byt, write_byt);
 393                 if ((read_ops != -1LL) || (write_ops != -1LL))
 394                         disk_submit (disk_name, "disk_ops", read_ops, write_ops);
 395                 if ((read_tme != -1LL) || (write_tme != -1LL))
 396                         disk_submit (disk_name, "disk_time",
 397                                         read_tme / 1000,
 398                                         write_tme / 1000);
 399
 400                 CFRelease (child_dict);
 401                 IOObjectRelease (disk_child);
 402                 CFRelease (props_dict);
 403                 IOObjectRelease (disk);
 404         }
 405         IOObjectRelease (disk_list);
 406 /* #endif HAVE_IOKIT_IOKITLIB_H */
 407
 408 #elif KERNEL_LINUX
 409         FILE *fh;
 410         char buffer[1024];
 411
 412         char *fields[32];
 413         int numfields;
 414         int fieldshift = 0;
 415
 416         int major = 0;
 417         int minor = 0;
 418
 419         counter_t read_sectors  = 0;
 420         counter_t write_sectors = 0;
 421
 422         counter_t read_ops      = 0;
 423         counter_t read_merged   = 0;
 424         counter_t read_time     = 0;
 425         counter_t write_ops     = 0;
 426         counter_t write_merged  = 0;
 427         counter_t write_time    = 0;
 428         int is_disk = 0;
 429
 430         diskstats_t *ds, *pre_ds;
 431
 432         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 433         {
 434                 fh = fopen ("/proc/partitions", "r");
 435                 if (fh == NULL)
 436                 {
 437                         ERROR ("disk plugin: fopen (/proc/{diskstats,partitions}) failed.");
 438                         return (-1);
 439                 }
 440
 441                 /* Kernel is 2.4.* */
 442                 fieldshift = 1;
 443         }
 444
 445         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 446         {
 447                 char *disk_name;
 448
 449                 numfields = strsplit (buffer, fields, 32);
 450
 451                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 452                         continue;
 453
 454                 major = atoll (fields[0]);
 455                 minor = atoll (fields[1]);
 456
 457                 disk_name = fields[2 + fieldshift];
 458
 459                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 460                         if (strcmp (disk_name, ds->name) == 0)
 461                                 break;
 462
 463                 if (ds == NULL)
 464                 {
 465                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 466                                 continue;
 467
 468                         if ((ds->name = strdup (disk_name)) == NULL)
 469                         {
 470                                 free (ds);
 471                                 continue;
 472                         }
 473
 474                         if (pre_ds == NULL)
 475                                 disklist = ds;
 476                         else
 477                                 pre_ds->next = ds;
 478                 }
 479
 480                 is_disk = 0;
 481                 if (numfields == 7)
 482                 {
 483                         /* Kernel 2.6, Partition */
 484                         read_ops      = atoll (fields[3]);
 485                         read_sectors  = atoll (fields[4]);
 486                         write_ops     = atoll (fields[5]);
 487                         write_sectors = atoll (fields[6]);
 488                 }
 489                 else if (numfields == (14 + fieldshift))
 490                 {
 491                         read_ops  =  atoll (fields[3 + fieldshift]);
 492                         write_ops =  atoll (fields[7 + fieldshift]);
 493
 494                         read_sectors  = atoll (fields[5 + fieldshift]);
 495                         write_sectors = atoll (fields[9 + fieldshift]);
 496
 497                         if ((fieldshift == 0) || (minor == 0))
 498                         {
 499                                 is_disk = 1;
 500                                 read_merged  = atoll (fields[4 + fieldshift]);
 501                                 read_time    = atoll (fields[6 + fieldshift]);
 502                                 write_merged = atoll (fields[8 + fieldshift]);
 503                                 write_time   = atoll (fields[10+ fieldshift]);
 504                         }
 505                 }
 506                 else
 507                 {
 508                         DEBUG ("numfields = %i; => unknown file format.", numfields);
 509                         continue;
 510                 }
 511
 512                 {
 513                         counter_t diff_read_sectors;
 514                         counter_t diff_write_sectors;
 515
 516                 /* If the counter wraps around, it's only 32 bits.. */
 517                         if (read_sectors < ds->read_sectors)
 518                                 diff_read_sectors = 1 + read_sectors
 519                                         + (UINT_MAX - ds->read_sectors);
 520                         else
 521                                 diff_read_sectors = read_sectors - ds->read_sectors;
 522                         if (write_sectors < ds->write_sectors)
 523                                 diff_write_sectors = 1 + write_sectors
 524                                         + (UINT_MAX - ds->write_sectors);
 525                         else
 526                                 diff_write_sectors = write_sectors - ds->write_sectors;
 527
 528                         ds->read_bytes += 512 * diff_read_sectors;
 529                         ds->write_bytes += 512 * diff_write_sectors;
 530                         ds->read_sectors = read_sectors;
 531                         ds->write_sectors = write_sectors;
 532                 }
 533
 534                 /* Calculate the average time an io-op needs to complete */
 535                 if (is_disk)
 536                 {
 537                         counter_t diff_read_ops;
 538                         counter_t diff_write_ops;
 539                         counter_t diff_read_time;
 540                         counter_t diff_write_time;
 541
 542                         if (read_ops < ds->read_ops)
 543                                 diff_read_ops = 1 + read_ops
 544                                         + (UINT_MAX - ds->read_ops);
 545                         else
 546                                 diff_read_ops = read_ops - ds->read_ops;
 547                         DEBUG ("disk plugin: disk_name = %s; read_ops = %llu; "
 548                                         "ds->read_ops = %llu; diff_read_ops = %llu;",
 549                                         disk_name,
 550                                         read_ops, ds->read_ops, diff_read_ops);
 551
 552                         if (write_ops < ds->write_ops)
 553                                 diff_write_ops = 1 + write_ops
 554                                         + (UINT_MAX - ds->write_ops);
 555                         else
 556                                 diff_write_ops = write_ops - ds->write_ops;
 557
 558                         if (read_time < ds->read_time)
 559                                 diff_read_time = 1 + read_time
 560                                         + (UINT_MAX - ds->read_time);
 561                         else
 562                                 diff_read_time = read_time - ds->read_time;
 563
 564                         if (write_time < ds->write_time)
 565                                 diff_write_time = 1 + write_time
 566                                         + (UINT_MAX - ds->write_time);
 567                         else
 568                                 diff_write_time = write_time - ds->write_time;
 569
 570                         if (diff_read_ops != 0)
 571                                 ds->avg_read_time += (diff_read_time
 572                                                 + (diff_read_ops / 2))
 573                                         / diff_read_ops;
 574                         if (diff_write_ops != 0)
 575                                 ds->avg_write_time += (diff_write_time
 576                                                 + (diff_write_ops / 2))
 577                                         / diff_write_ops;
 578
 579                         ds->read_ops = read_ops;
 580                         ds->read_time = read_time;
 581                         ds->write_ops = write_ops;
 582                         ds->write_time = write_time;
 583                 } /* if (is_disk) */
 584
 585                 /* Don't write to the RRDs if we've just started.. */
 586                 ds->poll_count++;
 587                 if (ds->poll_count <= 2)
 588                 {
 589                         DEBUG ("disk plugin: (ds->poll_count = %i) <= "
 590                                         "(min_poll_count = 2); => Not writing.",
 591                                         ds->poll_count);
 592                         continue;
 593                 }
 594
 595                 if ((read_ops == 0) && (write_ops == 0))
 596                 {
 597                         DEBUG ("disk plugin: ((read_ops == 0) && "
 598                                         "(write_ops == 0)); => Not writing.");
 599                         continue;
 600                 }
 601
 602                 if ((ds->read_bytes != 0) || (ds->write_bytes != 0))
 603                         disk_submit (disk_name, "disk_octets",
 604                                         ds->read_bytes, ds->write_bytes);
 605
 606                 if ((ds->read_ops != 0) || (ds->write_ops != 0))
 607                         disk_submit (disk_name, "disk_ops",
 608                                         read_ops, write_ops);
 609
 610                 if ((ds->avg_read_time != 0) || (ds->avg_write_time != 0))
 611                         disk_submit (disk_name, "disk_time",
 612                                         ds->avg_read_time, ds->avg_write_time);
 613
 614                 if (is_disk)
 615                 {
 616                         disk_submit (disk_name, "disk_merged",
 617                                         read_merged, write_merged);
 618                 } /* if (is_disk) */
 619         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 620
 621         fclose (fh);
 622 /* #endif defined(KERNEL_LINUX) */
 623
 624 #elif HAVE_LIBKSTAT
 625 # if HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_NWRITES && HAVE_KSTAT_IO_T_WTIME
 626 #  define KIO_ROCTETS reads
 627 #  define KIO_WOCTETS writes
 628 #  define KIO_ROPS    nreads
 629 #  define KIO_WOPS    nwrites
 630 #  define KIO_RTIME   rtime
 631 #  define KIO_WTIME   wtime
 632 # elif HAVE_KSTAT_IO_T_NWRITTEN && HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_WTIME
 633 #  define KIO_ROCTETS nread
 634 #  define KIO_WOCTETS nwritten
 635 #  define KIO_ROPS    reads
 636 #  define KIO_WOPS    writes
 637 #  define KIO_RTIME   rtime
 638 #  define KIO_WTIME   wtime
 639 # else
 640 #  error "kstat_io_t does not have the required members"
 641 # endif
 642         static kstat_io_t kio;
 643         int i;
 644
 645         if (kc == NULL)
 646                 return (-1);
 647
 648         for (i = 0; i < numdisk; i++)
 649         {
 650                 if (kstat_read (kc, ksp[i], &kio) == -1)
 651                         continue;
 652
 653                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 654                 {
 655                         disk_submit (ksp[i]->ks_name, "disk_octets",
 656                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 657                         disk_submit (ksp[i]->ks_name, "disk_ops",
 658                                         kio.KIO_ROPS, kio.KIO_WOPS);
 659                         /* FIXME: Convert this to microseconds if necessary */
 660                         disk_submit (ksp[i]->ks_name, "disk_time",
 661                                         kio.KIO_RTIME, kio.KIO_WTIME);
 662                 }
 663                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 664                 {
 665                         disk_submit (ksp[i]->ks_name, "disk_octets",
 666                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 667                         disk_submit (ksp[i]->ks_name, "disk_ops",
 668                                         kio.KIO_ROPS, kio.KIO_WOPS);
 669                 }
 670         }
 671 /* #endif defined(HAVE_LIBKSTAT) */
 672
 673 #elif defined(HAVE_LIBSTATGRAB)
 674         sg_disk_io_stats *ds;
 675         int disks, counter;
 676         char name[DATA_MAX_NAME_LEN];
 677
 678         if ((ds = sg_get_disk_io_stats(&disks)) == NULL)
 679                 return (0);
 680
 681         for (counter=0; counter < disks; counter++) {
 682                 strncpy(name, ds->disk_name, sizeof(name));
 683                 name[sizeof(name)-1] = '\0'; /* strncpy doesn't terminate longer strings */
 684                 disk_submit (name, "disk_octets", ds->read_bytes, ds->write_bytes);
 685                 ds++;
 686         }
 687 #endif /* defined(HAVE_LIBSTATGRAB) */
 688
 689         return (0);
 690 } /* int disk_read */
 691
 692 void module_register (void)
 693 {
 694   plugin_register_config ("disk", disk_config,
 695       config_keys, config_keys_num);
 696   plugin_register_init ("disk", disk_init);
 697   plugin_register_read ("disk", disk_read);
 698 } /* void module_register */