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