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 #if HAVE_LIBUDEV
 132 #include <libudev.h>
 133
 134 static char *conf_udev_name_attr = NULL;
 135 static struct udev *handle_udev;
 136 #endif
 137
 138 static const char *config_keys[] =
 139 {
 140         "Disk",
 141         "UseBSDName",
 142         "IgnoreSelected",
 143         "UdevNameAttr"
 144 };
 145 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 146
 147 static ignorelist_t *ignorelist = NULL;
 148
 149 static int disk_config (const char *key, const char *value)
 150 {
 151   if (ignorelist == NULL)
 152     ignorelist = ignorelist_create (/* invert = */ 1);
 153   if (ignorelist == NULL)
 154     return (1);
 155
 156   if (strcasecmp ("Disk", key) == 0)
 157   {
 158     ignorelist_add (ignorelist, value);
 159   }
 160   else if (strcasecmp ("IgnoreSelected", key) == 0)
 161   {
 162     int invert = 1;
 163     if (IS_TRUE (value))
 164       invert = 0;
 165     ignorelist_set_invert (ignorelist, invert);
 166   }
 167   else if (strcasecmp ("UseBSDName", key) == 0)
 168   {
 169 #if HAVE_IOKIT_IOKITLIB_H
 170     use_bsd_name = IS_TRUE (value) ? 1 : 0;
 171 #else
 172     WARNING ("disk plugin: The \"UseBSDName\" option is only supported "
 173         "on Mach / Mac OS X and will be ignored.");
 174 #endif
 175   }
 176   else if (strcasecmp ("UdevNameAttr", key) == 0)
 177   {
 178 #if HAVE_LIBUDEV
 179     if (conf_udev_name_attr != NULL)
 180     {
 181       free (conf_udev_name_attr);
 182       conf_udev_name_attr = NULL;
 183     }
 184     if ((conf_udev_name_attr = strdup (value)) == NULL)
 185       return (1);
 186 #else
 187     WARNING ("disk plugin: The \"UdevNameAttr\" option is only supported "
 188         "if collectd is built with libudev support");
 189 #endif
 190   }
 191   else
 192   {
 193     return (-1);
 194   }
 195
 196   return (0);
 197 } /* int disk_config */
 198
 199 static int disk_init (void)
 200 {
 201 #if HAVE_IOKIT_IOKITLIB_H
 202         kern_return_t status;
 203
 204         if (io_master_port != MACH_PORT_NULL)
 205         {
 206                 mach_port_deallocate (mach_task_self (),
 207                                 io_master_port);
 208                 io_master_port = MACH_PORT_NULL;
 209         }
 210
 211         status = IOMasterPort (MACH_PORT_NULL, &io_master_port);
 212         if (status != kIOReturnSuccess)
 213         {
 214                 ERROR ("IOMasterPort failed: %s",
 215                                 mach_error_string (status));
 216                 io_master_port = MACH_PORT_NULL;
 217                 return (-1);
 218         }
 219 /* #endif HAVE_IOKIT_IOKITLIB_H */
 220
 221 #elif KERNEL_LINUX
 222         /* do nothing */
 223 /* #endif KERNEL_LINUX */
 224
 225 #elif HAVE_LIBKSTAT
 226         kstat_t *ksp_chain;
 227
 228         numdisk = 0;
 229
 230         if (kc == NULL)
 231                 return (-1);
 232
 233         for (numdisk = 0, ksp_chain = kc->kc_chain;
 234                         (numdisk < MAX_NUMDISK) && (ksp_chain != NULL);
 235                         ksp_chain = ksp_chain->ks_next)
 236         {
 237                 if (strncmp (ksp_chain->ks_class, "disk", 4)
 238                                 && strncmp (ksp_chain->ks_class, "partition", 9))
 239                         continue;
 240                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
 241                         continue;
 242                 ksp[numdisk++] = ksp_chain;
 243         }
 244 #endif /* HAVE_LIBKSTAT */
 245
 246         return (0);
 247 } /* int disk_init */
 248
 249 static void disk_submit (const char *plugin_instance,
 250                 const char *type,
 251                 derive_t read, derive_t write)
 252 {
 253         value_t values[2];
 254         value_list_t vl = VALUE_LIST_INIT;
 255
 256         /* Both `ignorelist' and `plugin_instance' may be NULL. */
 257         if (ignorelist_match (ignorelist, plugin_instance) != 0)
 258           return;
 259
 260         values[0].derive = read;
 261         values[1].derive = write;
 262
 263         vl.values = values;
 264         vl.values_len = 2;
 265         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 266         sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
 267         sstrncpy (vl.plugin_instance, plugin_instance,
 268                         sizeof (vl.plugin_instance));
 269         sstrncpy (vl.type, type, sizeof (vl.type));
 270
 271         plugin_dispatch_values (&vl);
 272 } /* void disk_submit */
 273
 274 #if KERNEL_LINUX
 275 static void submit_in_progress (char const *disk_name, gauge_t in_progress)
 276 {
 277         value_t v;
 278         value_list_t vl = VALUE_LIST_INIT;
 279
 280         if (ignorelist_match (ignorelist, disk_name) != 0)
 281           return;
 282
 283         v.gauge = in_progress;
 284
 285         vl.values = &v;
 286         vl.values_len = 1;
 287         sstrncpy (vl.host, hostname_g, sizeof (vl.host));
 288         sstrncpy (vl.plugin, "disk", sizeof (vl.plugin));
 289         sstrncpy (vl.plugin_instance, disk_name, sizeof (vl.plugin_instance));
 290         sstrncpy (vl.type, "pending_operations", sizeof (vl.type));
 291
 292         plugin_dispatch_values (&vl);
 293 }
 294
 295 static counter_t disk_calc_time_incr (counter_t delta_time, counter_t delta_ops)
 296 {
 297         double interval = CDTIME_T_TO_DOUBLE (plugin_get_interval ());
 298         double avg_time = ((double) delta_time) / ((double) delta_ops);
 299         double avg_time_incr = interval * avg_time;
 300
 301         return ((counter_t) (avg_time_incr + .5));
 302 }
 303 #endif
 304
 305 #if HAVE_LIBUDEV
 306 /**
 307  * Attempt to provide an rename disk instance from an assigned udev attribute.
 308  *
 309  * On success, it returns a strduped char* to the desired attribute value.
 310  * Otherwise it returns NULL.
 311  */
 312
 313 static char *disk_udev_attr_name (struct udev *udev, char *disk_name, const char *attr)
 314 {
 315         struct udev_device *dev;
 316         const char *prop;
 317         char *output = NULL;
 318
 319         dev = udev_device_new_from_subsystem_sysname (udev, "block", disk_name);
 320         if (dev != NULL)
 321         {
 322                 prop = udev_device_get_property_value (dev, attr);
 323                 if (prop) {
 324                         output = strdup (prop);
 325                         DEBUG ("disk plugin: renaming %s => %s", disk_name, output);
 326                 }
 327                 udev_device_unref (dev);
 328         }
 329         return output;
 330 }
 331 #endif
 332
 333 #if HAVE_IOKIT_IOKITLIB_H
 334 static signed long long dict_get_value (CFDictionaryRef dict, const char *key)
 335 {
 336         signed long long val_int;
 337         CFNumberRef      val_obj;
 338         CFStringRef      key_obj;
 339
 340         /* `key_obj' needs to be released. */
 341         key_obj = CFStringCreateWithCString (kCFAllocatorDefault, key,
 342                         kCFStringEncodingASCII);
 343         if (key_obj == NULL)
 344         {
 345                 DEBUG ("CFStringCreateWithCString (%s) failed.", key);
 346                 return (-1LL);
 347         }
 348
 349         /* get => we don't need to release (== free) the object */
 350         val_obj = (CFNumberRef) CFDictionaryGetValue (dict, key_obj);
 351
 352         CFRelease (key_obj);
 353
 354         if (val_obj == NULL)
 355         {
 356                 DEBUG ("CFDictionaryGetValue (%s) failed.", key);
 357                 return (-1LL);
 358         }
 359
 360         if (!CFNumberGetValue (val_obj, kCFNumberSInt64Type, &val_int))
 361         {
 362                 DEBUG ("CFNumberGetValue (%s) failed.", key);
 363                 return (-1LL);
 364         }
 365
 366         return (val_int);
 367 }
 368 #endif /* HAVE_IOKIT_IOKITLIB_H */
 369
 370 static int disk_read (void)
 371 {
 372 #if HAVE_IOKIT_IOKITLIB_H
 373         io_registry_entry_t     disk;
 374         io_registry_entry_t     disk_child;
 375         io_iterator_t           disk_list;
 376         CFDictionaryRef         props_dict;
 377         CFDictionaryRef         stats_dict;
 378         CFDictionaryRef         child_dict;
 379         CFStringRef             tmp_cf_string_ref;
 380         kern_return_t           status;
 381
 382         signed long long read_ops;
 383         signed long long read_byt;
 384         signed long long read_tme;
 385         signed long long write_ops;
 386         signed long long write_byt;
 387         signed long long write_tme;
 388
 389         int  disk_major;
 390         int  disk_minor;
 391         char disk_name[DATA_MAX_NAME_LEN];
 392         char disk_name_bsd[DATA_MAX_NAME_LEN];
 393
 394         /* Get the list of all disk objects. */
 395         if (IOServiceGetMatchingServices (io_master_port,
 396                                 IOServiceMatching (kIOBlockStorageDriverClass),
 397                                 &disk_list) != kIOReturnSuccess)
 398         {
 399                 ERROR ("disk plugin: IOServiceGetMatchingServices failed.");
 400                 return (-1);
 401         }
 402
 403         while ((disk = IOIteratorNext (disk_list)) != 0)
 404         {
 405                 props_dict = NULL;
 406                 stats_dict = NULL;
 407                 child_dict = NULL;
 408
 409                 /* `disk_child' must be released */
 410                 if ((status = IORegistryEntryGetChildEntry (disk, kIOServicePlane, &disk_child))
 411                                 != kIOReturnSuccess)
 412                 {
 413                         /* This fails for example for DVD/CD drives.. */
 414                         DEBUG ("IORegistryEntryGetChildEntry (disk) failed: 0x%08x", status);
 415                         IOObjectRelease (disk);
 416                         continue;
 417                 }
 418
 419                 /* We create `props_dict' => we need to release it later */
 420                 if (IORegistryEntryCreateCFProperties (disk,
 421                                         (CFMutableDictionaryRef *) &props_dict,
 422                                         kCFAllocatorDefault,
 423                                         kNilOptions)
 424                                 != kIOReturnSuccess)
 425                 {
 426                         ERROR ("disk-plugin: IORegistryEntryCreateCFProperties failed.");
 427                         IOObjectRelease (disk_child);
 428                         IOObjectRelease (disk);
 429                         continue;
 430                 }
 431
 432                 if (props_dict == NULL)
 433                 {
 434                         DEBUG ("IORegistryEntryCreateCFProperties (disk) failed.");
 435                         IOObjectRelease (disk_child);
 436                         IOObjectRelease (disk);
 437                         continue;
 438                 }
 439
 440                 /* tmp_cf_string_ref doesn't need to be released. */
 441                 tmp_cf_string_ref = (CFStringRef) CFDictionaryGetValue (props_dict,
 442                                 CFSTR(kIOBSDNameKey));
 443                 if (!tmp_cf_string_ref)
 444                 {
 445                         DEBUG ("disk plugin: CFDictionaryGetValue("
 446                                         "kIOBSDNameKey) failed.");
 447                         CFRelease (props_dict);
 448                         IOObjectRelease (disk_child);
 449                         IOObjectRelease (disk);
 450                         continue;
 451                 }
 452                 assert (CFGetTypeID (tmp_cf_string_ref) == CFStringGetTypeID ());
 453
 454                 memset (disk_name_bsd, 0, sizeof (disk_name_bsd));
 455                 CFStringGetCString (tmp_cf_string_ref,
 456                                 disk_name_bsd, sizeof (disk_name_bsd),
 457                                 kCFStringEncodingUTF8);
 458                 if (disk_name_bsd[0] == 0)
 459                 {
 460                         ERROR ("disk plugin: CFStringGetCString() failed.");
 461                         CFRelease (props_dict);
 462                         IOObjectRelease (disk_child);
 463                         IOObjectRelease (disk);
 464                         continue;
 465                 }
 466                 DEBUG ("disk plugin: disk_name_bsd = \"%s\"", disk_name_bsd);
 467
 468                 stats_dict = (CFDictionaryRef) CFDictionaryGetValue (props_dict,
 469                                 CFSTR (kIOBlockStorageDriverStatisticsKey));
 470
 471                 if (stats_dict == NULL)
 472                 {
 473                         DEBUG ("disk plugin: CFDictionaryGetValue ("
 474                                         "%s) failed.",
 475                                         kIOBlockStorageDriverStatisticsKey);
 476                         CFRelease (props_dict);
 477                         IOObjectRelease (disk_child);
 478                         IOObjectRelease (disk);
 479                         continue;
 480                 }
 481
 482                 if (IORegistryEntryCreateCFProperties (disk_child,
 483                                         (CFMutableDictionaryRef *) &child_dict,
 484                                         kCFAllocatorDefault,
 485                                         kNilOptions)
 486                                 != kIOReturnSuccess)
 487                 {
 488                         DEBUG ("disk plugin: IORegistryEntryCreateCFProperties ("
 489                                         "disk_child) failed.");
 490                         IOObjectRelease (disk_child);
 491                         CFRelease (props_dict);
 492                         IOObjectRelease (disk);
 493                         continue;
 494                 }
 495
 496                 /* kIOBSDNameKey */
 497                 disk_major = (int) dict_get_value (child_dict,
 498                                 kIOBSDMajorKey);
 499                 disk_minor = (int) dict_get_value (child_dict,
 500                                 kIOBSDMinorKey);
 501                 read_ops  = dict_get_value (stats_dict,
 502                                 kIOBlockStorageDriverStatisticsReadsKey);
 503                 read_byt  = dict_get_value (stats_dict,
 504                                 kIOBlockStorageDriverStatisticsBytesReadKey);
 505                 read_tme  = dict_get_value (stats_dict,
 506                                 kIOBlockStorageDriverStatisticsTotalReadTimeKey);
 507                 write_ops = dict_get_value (stats_dict,
 508                                 kIOBlockStorageDriverStatisticsWritesKey);
 509                 write_byt = dict_get_value (stats_dict,
 510                                 kIOBlockStorageDriverStatisticsBytesWrittenKey);
 511                 /* This property describes the number of nanoseconds spent
 512                  * performing writes since the block storage driver was
 513                  * instantiated. It is one of the statistic entries listed
 514                  * under the top-level kIOBlockStorageDriverStatisticsKey
 515                  * property table. It has an OSNumber value. */
 516                 write_tme = dict_get_value (stats_dict,
 517                                 kIOBlockStorageDriverStatisticsTotalWriteTimeKey);
 518
 519                 if (use_bsd_name)
 520                         sstrncpy (disk_name, disk_name_bsd, sizeof (disk_name));
 521                 else
 522                         ssnprintf (disk_name, sizeof (disk_name), "%i-%i",
 523                                         disk_major, disk_minor);
 524                 DEBUG ("disk plugin: disk_name = \"%s\"", disk_name);
 525
 526                 if ((read_byt != -1LL) || (write_byt != -1LL))
 527                         disk_submit (disk_name, "disk_octets", read_byt, write_byt);
 528                 if ((read_ops != -1LL) || (write_ops != -1LL))
 529                         disk_submit (disk_name, "disk_ops", read_ops, write_ops);
 530                 if ((read_tme != -1LL) || (write_tme != -1LL))
 531                         disk_submit (disk_name, "disk_time",
 532                                         read_tme / 1000,
 533                                         write_tme / 1000);
 534
 535                 CFRelease (child_dict);
 536                 IOObjectRelease (disk_child);
 537                 CFRelease (props_dict);
 538                 IOObjectRelease (disk);
 539         }
 540         IOObjectRelease (disk_list);
 541 /* #endif HAVE_IOKIT_IOKITLIB_H */
 542
 543 #elif KERNEL_LINUX
 544         FILE *fh;
 545         char buffer[1024];
 546
 547         char *fields[32];
 548         int numfields;
 549         int fieldshift = 0;
 550
 551         int minor = 0;
 552
 553         derive_t read_sectors  = 0;
 554         derive_t write_sectors = 0;
 555
 556         derive_t read_ops      = 0;
 557         derive_t read_merged   = 0;
 558         derive_t read_time     = 0;
 559         derive_t write_ops     = 0;
 560         derive_t write_merged  = 0;
 561         derive_t write_time    = 0;
 562         gauge_t in_progress    = NAN;
 563         int is_disk = 0;
 564
 565         diskstats_t *ds, *pre_ds;
 566
 567         if ((fh = fopen ("/proc/diskstats", "r")) == NULL)
 568         {
 569                 fh = fopen ("/proc/partitions", "r");
 570                 if (fh == NULL)
 571                 {
 572                         ERROR ("disk plugin: fopen (/proc/{diskstats,partitions}) failed.");
 573                         return (-1);
 574                 }
 575
 576                 /* Kernel is 2.4.* */
 577                 fieldshift = 1;
 578         }
 579
 580 #if HAVE_LIBUDEV
 581         handle_udev = udev_new();
 582 #endif
 583
 584         while (fgets (buffer, sizeof (buffer), fh) != NULL)
 585         {
 586                 char *disk_name;
 587                 char *output_name;
 588                 char *alt_name;
 589
 590                 numfields = strsplit (buffer, fields, 32);
 591
 592                 if ((numfields != (14 + fieldshift)) && (numfields != 7))
 593                         continue;
 594
 595                 minor = atoll (fields[1]);
 596
 597                 disk_name = fields[2 + fieldshift];
 598
 599                 for (ds = disklist, pre_ds = disklist; ds != NULL; pre_ds = ds, ds = ds->next)
 600                         if (strcmp (disk_name, ds->name) == 0)
 601                                 break;
 602
 603                 if (ds == NULL)
 604                 {
 605                         if ((ds = (diskstats_t *) calloc (1, sizeof (diskstats_t))) == NULL)
 606                                 continue;
 607
 608                         if ((ds->name = strdup (disk_name)) == NULL)
 609                         {
 610                                 free (ds);
 611                                 continue;
 612                         }
 613
 614                         if (pre_ds == NULL)
 615                                 disklist = ds;
 616                         else
 617                                 pre_ds->next = ds;
 618                 }
 619
 620                 is_disk = 0;
 621                 if (numfields == 7)
 622                 {
 623                         /* Kernel 2.6, Partition */
 624                         read_ops      = atoll (fields[3]);
 625                         read_sectors  = atoll (fields[4]);
 626                         write_ops     = atoll (fields[5]);
 627                         write_sectors = atoll (fields[6]);
 628                 }
 629                 else if (numfields == (14 + fieldshift))
 630                 {
 631                         read_ops  =  atoll (fields[3 + fieldshift]);
 632                         write_ops =  atoll (fields[7 + fieldshift]);
 633
 634                         read_sectors  = atoll (fields[5 + fieldshift]);
 635                         write_sectors = atoll (fields[9 + fieldshift]);
 636
 637                         if ((fieldshift == 0) || (minor == 0))
 638                         {
 639                                 is_disk = 1;
 640                                 read_merged  = atoll (fields[4 + fieldshift]);
 641                                 read_time    = atoll (fields[6 + fieldshift]);
 642                                 write_merged = atoll (fields[8 + fieldshift]);
 643                                 write_time   = atoll (fields[10+ fieldshift]);
 644
 645                                 in_progress = atof (fields[11 + fieldshift]);
 646                         }
 647                 }
 648                 else
 649                 {
 650                         DEBUG ("numfields = %i; => unknown file format.", numfields);
 651                         continue;
 652                 }
 653
 654                 {
 655                         derive_t diff_read_sectors;
 656                         derive_t diff_write_sectors;
 657
 658                 /* If the counter wraps around, it's only 32 bits.. */
 659                         if (read_sectors < ds->read_sectors)
 660                                 diff_read_sectors = 1 + read_sectors
 661                                         + (UINT_MAX - ds->read_sectors);
 662                         else
 663                                 diff_read_sectors = read_sectors - ds->read_sectors;
 664                         if (write_sectors < ds->write_sectors)
 665                                 diff_write_sectors = 1 + write_sectors
 666                                         + (UINT_MAX - ds->write_sectors);
 667                         else
 668                                 diff_write_sectors = write_sectors - ds->write_sectors;
 669
 670                         ds->read_bytes += 512 * diff_read_sectors;
 671                         ds->write_bytes += 512 * diff_write_sectors;
 672                         ds->read_sectors = read_sectors;
 673                         ds->write_sectors = write_sectors;
 674                 }
 675
 676                 /* Calculate the average time an io-op needs to complete */
 677                 if (is_disk)
 678                 {
 679                         derive_t diff_read_ops;
 680                         derive_t diff_write_ops;
 681                         derive_t diff_read_time;
 682                         derive_t diff_write_time;
 683
 684                         if (read_ops < ds->read_ops)
 685                                 diff_read_ops = 1 + read_ops
 686                                         + (UINT_MAX - ds->read_ops);
 687                         else
 688                                 diff_read_ops = read_ops - ds->read_ops;
 689                         DEBUG ("disk plugin: disk_name = %s; read_ops = %"PRIi64"; "
 690                                         "ds->read_ops = %"PRIi64"; diff_read_ops = %"PRIi64";",
 691                                         disk_name,
 692                                         read_ops, ds->read_ops, diff_read_ops);
 693
 694                         if (write_ops < ds->write_ops)
 695                                 diff_write_ops = 1 + write_ops
 696                                         + (UINT_MAX - ds->write_ops);
 697                         else
 698                                 diff_write_ops = write_ops - ds->write_ops;
 699
 700                         if (read_time < ds->read_time)
 701                                 diff_read_time = 1 + read_time
 702                                         + (UINT_MAX - ds->read_time);
 703                         else
 704                                 diff_read_time = read_time - ds->read_time;
 705
 706                         if (write_time < ds->write_time)
 707                                 diff_write_time = 1 + write_time
 708                                         + (UINT_MAX - ds->write_time);
 709                         else
 710                                 diff_write_time = write_time - ds->write_time;
 711
 712                         if (diff_read_ops != 0)
 713                                 ds->avg_read_time += disk_calc_time_incr (
 714                                                 diff_read_time, diff_read_ops);
 715                         if (diff_write_ops != 0)
 716                                 ds->avg_write_time += disk_calc_time_incr (
 717                                                 diff_write_time, diff_write_ops);
 718
 719                         ds->read_ops = read_ops;
 720                         ds->read_time = read_time;
 721                         ds->write_ops = write_ops;
 722                         ds->write_time = write_time;
 723                 } /* if (is_disk) */
 724
 725                 /* Don't write to the RRDs if we've just started.. */
 726                 ds->poll_count++;
 727                 if (ds->poll_count <= 2)
 728                 {
 729                         DEBUG ("disk plugin: (ds->poll_count = %i) <= "
 730                                         "(min_poll_count = 2); => Not writing.",
 731                                         ds->poll_count);
 732                         continue;
 733                 }
 734
 735                 if ((read_ops == 0) && (write_ops == 0))
 736                 {
 737                         DEBUG ("disk plugin: ((read_ops == 0) && "
 738                                         "(write_ops == 0)); => Not writing.");
 739                         continue;
 740                 }
 741
 742                 output_name = disk_name;
 743
 744 #if HAVE_LIBUDEV
 745                 alt_name = disk_udev_attr_name (handle_udev, disk_name,
 746                                 conf_udev_name_attr);
 747 #else
 748                 alt_name = NULL;
 749 #endif
 750                 if (alt_name != NULL)
 751                         output_name = alt_name;
 752
 753                 if ((ds->read_bytes != 0) || (ds->write_bytes != 0))
 754                         disk_submit (output_name, "disk_octets",
 755                                         ds->read_bytes, ds->write_bytes);
 756
 757                 if ((ds->read_ops != 0) || (ds->write_ops != 0))
 758                         disk_submit (output_name, "disk_ops",
 759                                         read_ops, write_ops);
 760
 761                 if ((ds->avg_read_time != 0) || (ds->avg_write_time != 0))
 762                         disk_submit (output_name, "disk_time",
 763                                         ds->avg_read_time, ds->avg_write_time);
 764
 765                 if (is_disk)
 766                 {
 767                         disk_submit (output_name, "disk_merged",
 768                                         read_merged, write_merged);
 769                         submit_in_progress (output_name, in_progress);
 770                 } /* if (is_disk) */
 771
 772                 /* release udev-based alternate name, if allocated */
 773                 free(alt_name);
 774         } /* while (fgets (buffer, sizeof (buffer), fh) != NULL) */
 775
 776 #if HAVE_LIBUDEV
 777         udev_unref(handle_udev);
 778 #endif
 779
 780         fclose (fh);
 781 /* #endif defined(KERNEL_LINUX) */
 782
 783 #elif HAVE_LIBKSTAT
 784 # if HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_NWRITES && HAVE_KSTAT_IO_T_WTIME
 785 #  define KIO_ROCTETS reads
 786 #  define KIO_WOCTETS writes
 787 #  define KIO_ROPS    nreads
 788 #  define KIO_WOPS    nwrites
 789 #  define KIO_RTIME   rtime
 790 #  define KIO_WTIME   wtime
 791 # elif HAVE_KSTAT_IO_T_NWRITTEN && HAVE_KSTAT_IO_T_WRITES && HAVE_KSTAT_IO_T_WTIME
 792 #  define KIO_ROCTETS nread
 793 #  define KIO_WOCTETS nwritten
 794 #  define KIO_ROPS    reads
 795 #  define KIO_WOPS    writes
 796 #  define KIO_RTIME   rtime
 797 #  define KIO_WTIME   wtime
 798 # else
 799 #  error "kstat_io_t does not have the required members"
 800 # endif
 801         static kstat_io_t kio;
 802         int i;
 803
 804         if (kc == NULL)
 805                 return (-1);
 806
 807         for (i = 0; i < numdisk; i++)
 808         {
 809                 if (kstat_read (kc, ksp[i], &kio) == -1)
 810                         continue;
 811
 812                 if (strncmp (ksp[i]->ks_class, "disk", 4) == 0)
 813                 {
 814                         disk_submit (ksp[i]->ks_name, "disk_octets",
 815                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 816                         disk_submit (ksp[i]->ks_name, "disk_ops",
 817                                         kio.KIO_ROPS, kio.KIO_WOPS);
 818                         /* FIXME: Convert this to microseconds if necessary */
 819                         disk_submit (ksp[i]->ks_name, "disk_time",
 820                                         kio.KIO_RTIME, kio.KIO_WTIME);
 821                 }
 822                 else if (strncmp (ksp[i]->ks_class, "partition", 9) == 0)
 823                 {
 824                         disk_submit (ksp[i]->ks_name, "disk_octets",
 825                                         kio.KIO_ROCTETS, kio.KIO_WOCTETS);
 826                         disk_submit (ksp[i]->ks_name, "disk_ops",
 827                                         kio.KIO_ROPS, kio.KIO_WOPS);
 828                 }
 829         }
 830 /* #endif defined(HAVE_LIBKSTAT) */
 831
 832 #elif defined(HAVE_LIBSTATGRAB)
 833         sg_disk_io_stats *ds;
 834         int disks, counter;
 835         char name[DATA_MAX_NAME_LEN];
 836
 837         if ((ds = sg_get_disk_io_stats(&disks)) == NULL)
 838                 return (0);
 839
 840         for (counter=0; counter < disks; counter++) {
 841                 strncpy(name, ds->disk_name, sizeof(name));
 842                 name[sizeof(name)-1] = '\0'; /* strncpy doesn't terminate longer strings */
 843                 disk_submit (name, "disk_octets", ds->read_bytes, ds->write_bytes);
 844                 ds++;
 845         }
 846 /* #endif defined(HAVE_LIBSTATGRAB) */
 847
 848 #elif defined(HAVE_PERFSTAT)
 849         derive_t read_sectors;
 850         derive_t write_sectors;
 851         derive_t read_time;
 852         derive_t write_time;
 853         derive_t read_ops;
 854         derive_t write_ops;
 855         perfstat_id_t firstpath;
 856         int rnumdisk;
 857         int i;
 858
 859         if ((numdisk = perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0)) < 0)
 860         {
 861                 char errbuf[1024];
 862                 WARNING ("disk plugin: perfstat_disk: %s",
 863                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 864                 return (-1);
 865         }
 866
 867         if (numdisk != pnumdisk || stat_disk==NULL) {
 868                 if (stat_disk!=NULL)
 869                         free(stat_disk);
 870                 stat_disk = (perfstat_disk_t *)calloc(numdisk, sizeof(perfstat_disk_t));
 871         }
 872         pnumdisk = numdisk;
 873
 874         firstpath.name[0]='\0';
 875         if ((rnumdisk = perfstat_disk(&firstpath, stat_disk, sizeof(perfstat_disk_t), numdisk)) < 0)
 876         {
 877                 char errbuf[1024];
 878                 WARNING ("disk plugin: perfstat_disk : %s",
 879                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 880                 return (-1);
 881         }
 882
 883         for (i = 0; i < rnumdisk; i++)
 884         {
 885                 read_sectors = stat_disk[i].rblks*stat_disk[i].bsize;
 886                 write_sectors = stat_disk[i].wblks*stat_disk[i].bsize;
 887                 disk_submit (stat_disk[i].name, "disk_octets", read_sectors, write_sectors);
 888
 889                 read_ops = stat_disk[i].xrate;
 890                 write_ops = stat_disk[i].xfers - stat_disk[i].xrate;
 891                 disk_submit (stat_disk[i].name, "disk_ops", read_ops, write_ops);
 892
 893                 read_time = stat_disk[i].rserv;
 894                 read_time *= ((double)(_system_configuration.Xint)/(double)(_system_configuration.Xfrac)) / 1000000.0;
 895                 write_time = stat_disk[i].wserv;
 896                 write_time *= ((double)(_system_configuration.Xint)/(double)(_system_configuration.Xfrac)) / 1000000.0;
 897                 disk_submit (stat_disk[i].name, "disk_time", read_time, write_time);
 898         }
 899 #endif /* defined(HAVE_PERFSTAT) */
 900
 901         return (0);
 902 } /* int disk_read */
 903
 904 void module_register (void)
 905 {
 906   plugin_register_config ("disk", disk_config,
 907       config_keys, config_keys_num);
 908   plugin_register_init ("disk", disk_init);
 909   plugin_register_read ("disk", disk_read);
 910 } /* void module_register */