src/proc_diskstats.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <sys/statvfs.h>
  10 #include <fcntl.h>
  11
  12 #include "common.h"
  13 #include "log.h"
  14 #include "appconfig.h"
  15 #include "procfile.h"
  16 #include "rrd.h"
  17 #include "plugin_proc.h"
  18
  19 #include "proc_self_mountinfo.h"
  20
  21 #define RRD_TYPE_DISK "disk"
  22
  23 struct disk {
  24         unsigned long major;
  25         unsigned long minor;
  26         int partition_id;       // -1 = this is not a partition
  27         char *mount_point;
  28         char *family;
  29         struct disk *next;
  30 } *disk_root = NULL;
  31
  32 struct disk *get_disk(unsigned long major, unsigned long minor) {
  33         static char path_find_block_device_partition[FILENAME_MAX + 1] = "";
  34         static struct mountinfo *mountinfo_root = NULL;
  35         struct disk *d;
  36
  37         // search for it in our RAM list.
  38         // this is sequential, but since we just walk through
  39         // and the number of disks / partitions in a system
  40         // should not be that many, it should be acceptable
  41         for(d = disk_root; d ; d = d->next)
  42                 if(unlikely(d->major == major && d->minor == minor))
  43                         break;
  44
  45         // if we found it, return it
  46         if(likely(d))
  47                 return d;
  48
  49         if(unlikely(!path_find_block_device_partition[0])) {
  50                 char filename[FILENAME_MAX + 1];
  51                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/partition");
  52                 snprintfz(path_find_block_device_partition, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device partition", filename));
  53         }
  54
  55         // not found
  56         // create a new disk structure
  57         d = (struct disk *)malloc(sizeof(struct disk));
  58         if(!d) fatal("Cannot allocate memory for struct disk in proc_diskstats.");
  59
  60         d->major = major;
  61         d->minor = minor;
  62         d->partition_id = -1;
  63         d->next = NULL;
  64
  65         // append it to the list
  66         if(!disk_root)
  67                 disk_root = d;
  68         else {
  69                 struct disk *last;
  70                 for(last = disk_root; last->next ;last = last->next);
  71                 last->next = d;
  72         }
  73
  74         // find if it is a partition
  75         // by reading /sys/dev/block/MAJOR:MINOR/partition
  76         char buffer[FILENAME_MAX + 1];
  77         snprintfz(buffer, FILENAME_MAX, path_find_block_device_partition, major, minor);
  78
  79         int fd = open(buffer, O_RDONLY, 0666);
  80         if(likely(fd != -1)) {
  81                 // we opened it
  82                 int bytes = read(fd, buffer, FILENAME_MAX);
  83                 close(fd);
  84
  85                 if(bytes > 0)
  86                         d->partition_id = strtoul(buffer, NULL, 10);
  87         }
  88         // if the /partition file does not exist, it is a disk, not a partition
  89
  90         // ------------------------------------------------------------------------
  91         // check if we can find its mount point
  92
  93         // mountinfo_find() can be called with NULL mountinfo_root
  94         struct mountinfo *mi = mountinfo_find(mountinfo_root, d->major, d->minor);
  95         if(unlikely(!mi)) {
  96                 // mountinfo_free() can be called with NULL mountinfo_root
  97                 mountinfo_free(mountinfo_root);
  98
  99                 // re-read mountinfo in case something changed
 100                 mountinfo_root = mountinfo_read();
 101
 102                 // search again for this disk
 103                 mi = mountinfo_find(mountinfo_root, d->major, d->minor);
 104         }
 105
 106         if(mi)
 107                 d->mount_point = strdup(mi->mount_point);
 108                 // no need to check for NULL
 109         else
 110                 d->mount_point = NULL;
 111
 112         return d;
 113 }
 114
 115 int do_proc_diskstats(int update_every, unsigned long long dt) {
 116         static procfile *ff = NULL;
 117         static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 118         static int enable_new_disks = -1;
 119         static int do_io = -1, do_ops = -1, do_mops = -1, do_iotime = -1, do_qops = -1, do_util = -1, do_backlog = -1, do_space = -1;
 120
 121         if(enable_new_disks == -1)      enable_new_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", CONFIG_ONDEMAND_ONDEMAND);
 122
 123         if(do_io == -1)         do_io           = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", CONFIG_ONDEMAND_ONDEMAND);
 124         if(do_ops == -1)        do_ops          = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 125         if(do_mops == -1)       do_mops         = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 126         if(do_iotime == -1)     do_iotime       = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", CONFIG_ONDEMAND_ONDEMAND);
 127         if(do_qops == -1)       do_qops         = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 128         if(do_util == -1)       do_util         = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 129         if(do_backlog == -1)do_backlog  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", CONFIG_ONDEMAND_ONDEMAND);
 130         if(do_space == -1)  do_space    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 131
 132         if(!ff) {
 133                 char filename[FILENAME_MAX + 1];
 134                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 135                 ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 136         }
 137         if(!ff) return 1;
 138
 139         if(!path_to_get_hw_sector_size[0]) {
 140                 char filename[FILENAME_MAX + 1];
 141                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 142                 snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", filename));
 143         }
 144
 145         ff = procfile_readall(ff);
 146         if(!ff) return 0; // we return 0, so that we will retry to open it next time
 147
 148         struct statvfs * buff_statvfs;
 149         if ( !(buff_statvfs = (struct statvfs *)
 150                                 malloc(sizeof(struct statvfs)))) {
 151                 error("Failed to allocate memory to buffer.");
 152         }
 153
 154         uint32_t lines = procfile_lines(ff), l;
 155         uint32_t words;
 156
 157         for(l = 0; l < lines ;l++) {
 158                 char *disk;
 159                 unsigned long long      major = 0, minor = 0,
 160                                                         reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 161                                                         writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 162                                                         queued_ios = 0, busy_ms = 0, backlog_ms = 0,
 163                                                         space_avail = 0, space_avail_root = 0, space_used = 0;
 164
 165                 unsigned long long      last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 166                                                         last_writes = 0, last_writesectors = 0, last_writems = 0,
 167                                                         last_busy_ms = 0;
 168
 169                 words = procfile_linewords(ff, l);
 170                 if(words < 14) continue;
 171
 172                 major                   = strtoull(procfile_lineword(ff, l, 0), NULL, 10);
 173                 minor                   = strtoull(procfile_lineword(ff, l, 1), NULL, 10);
 174                 disk                    = procfile_lineword(ff, l, 2);
 175
 176                 // # of reads completed # of writes completed
 177                 // This is the total number of reads or writes completed successfully.
 178                 reads                   = strtoull(procfile_lineword(ff, l, 3), NULL, 10);      // rd_ios
 179                 writes                  = strtoull(procfile_lineword(ff, l, 7), NULL, 10);      // wr_ios
 180
 181                 // # of reads merged # of writes merged
 182                 // Reads and writes which are adjacent to each other may be merged for
 183             // efficiency.  Thus two 4K reads may become one 8K read before it is
 184             // ultimately handed to the disk, and so it will be counted (and queued)
 185                 mreads                  = strtoull(procfile_lineword(ff, l, 4), NULL, 10);      // rd_merges_or_rd_sec
 186                 mwrites                 = strtoull(procfile_lineword(ff, l, 8), NULL, 10);      // wr_merges
 187
 188                 // # of sectors read # of sectors written
 189                 // This is the total number of sectors read or written successfully.
 190                 readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);      // rd_sec_or_wr_ios
 191                 writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);      // wr_sec
 192
 193                 // # of milliseconds spent reading # of milliseconds spent writing
 194                 // This is the total number of milliseconds spent by all reads or writes (as
 195                 // measured from __make_request() to end_that_request_last()).
 196                 readms                  = strtoull(procfile_lineword(ff, l, 6), NULL, 10);      // rd_ticks_or_wr_sec
 197                 writems                 = strtoull(procfile_lineword(ff, l, 10), NULL, 10);     // wr_ticks
 198
 199                 // # of I/Os currently in progress
 200                 // The only field that should go to zero. Incremented as requests are
 201                 // given to appropriate struct request_queue and decremented as they finish.
 202                 queued_ios              = strtoull(procfile_lineword(ff, l, 11), NULL, 10);     // ios_pgr
 203
 204                 // # of milliseconds spent doing I/Os
 205                 // This field increases so long as field queued_ios is nonzero.
 206                 busy_ms                 = strtoull(procfile_lineword(ff, l, 12), NULL, 10);     // tot_ticks
 207
 208                 // weighted # of milliseconds spent doing I/Os
 209                 // This field is incremented at each I/O start, I/O completion, I/O
 210                 // merge, or read of these stats by the number of I/Os in progress
 211                 // (field queued_ios) times the number of milliseconds spent doing I/O since the
 212                 // last update of this field.  This can provide an easy measure of both
 213                 // I/O completion time and the backlog that may be accumulating.
 214                 backlog_ms              = strtoull(procfile_lineword(ff, l, 13), NULL, 10);     // rq_ticks
 215
 216                 int def_enabled = 0;
 217
 218                 // remove slashes from disk names
 219                 char *s;
 220                 for(s = disk; *s ;s++) if(*s == '/') *s = '_';
 221
 222                 struct disk *d = get_disk(major, minor);
 223                 if(d->partition_id == -1)
 224                         def_enabled = enable_new_disks;
 225                 else
 226                         def_enabled = 0;
 227
 228                 char *mount_point = d->mount_point;
 229                 char *family = d->mount_point;
 230                 if(!family) family = disk;
 231
 232 /*
 233                 switch(major) {
 234                         case 9: // MDs
 235                         case 43: // network block
 236                         case 144: // nfs
 237                         case 145: // nfs
 238                         case 146: // nfs
 239                         case 199: // veritas
 240                         case 201: // veritas
 241                         case 251: // dm
 242                         case 253: // virtio
 243                                 def_enabled = enable_new_disks;
 244                                 break;
 245
 246                         case 48: // RAID
 247                         case 49: // RAID
 248                         case 50: // RAID
 249                         case 51: // RAID
 250                         case 52: // RAID
 251                         case 53: // RAID
 252                         case 54: // RAID
 253                         case 55: // RAID
 254                         case 112: // RAID
 255                         case 136: // RAID
 256                         case 137: // RAID
 257                         case 138: // RAID
 258                         case 139: // RAID
 259                         case 140: // RAID
 260                         case 141: // RAID
 261                         case 142: // RAID
 262                         case 143: // RAID
 263                         case 179: // MMC
 264                         case 180: // USB
 265                                 if(minor % 8) def_enabled = 0; // partitions
 266                                 else def_enabled = enable_new_disks;
 267                                 break;
 268
 269                         case 8: // scsi disks
 270                         case 65: // scsi disks
 271                         case 66: // scsi disks
 272                         case 67: // scsi disks
 273                         case 68: // scsi disks
 274                         case 69: // scsi disks
 275                         case 70: // scsi disks
 276                         case 71: // scsi disks
 277                         case 72: // scsi disks
 278                         case 73: // scsi disks
 279                         case 74: // scsi disks
 280                         case 75: // scsi disks
 281                         case 76: // scsi disks
 282                         case 77: // scsi disks
 283                         case 78: // scsi disks
 284                         case 79: // scsi disks
 285                         case 80: // i2o
 286                         case 81: // i2o
 287                         case 82: // i2o
 288                         case 83: // i2o
 289                         case 84: // i2o
 290                         case 85: // i2o
 291                         case 86: // i2o
 292                         case 87: // i2o
 293                         case 101: // hyperdisk
 294                         case 102: // compressed
 295                         case 104: // scsi
 296                         case 105: // scsi
 297                         case 106: // scsi
 298                         case 107: // scsi
 299                         case 108: // scsi
 300                         case 109: // scsi
 301                         case 110: // scsi
 302                         case 111: // scsi
 303                         case 114: // bios raid
 304                         case 116: // ram board
 305                         case 128: // scsi
 306                         case 129: // scsi
 307                         case 130: // scsi
 308                         case 131: // scsi
 309                         case 132: // scsi
 310                         case 133: // scsi
 311                         case 134: // scsi
 312                         case 135: // scsi
 313                         case 153: // raid
 314                         case 202: // xen
 315                         case 254: // virtio3
 316                         case 256: // flash
 317                         case 257: // flash
 318                         case 259: // nvme0n1 issue #119
 319                                 if(minor % 16) def_enabled = 0; // partitions
 320                                 else def_enabled = enable_new_disks;
 321                                 break;
 322
 323                         case 160: // raid
 324                         case 161: // raid
 325                                 if(minor % 32) def_enabled = 0; // partitions
 326                                 else def_enabled = enable_new_disks;
 327                                 break;
 328
 329                         case 3: // ide
 330                         case 13: // 8bit ide
 331                         case 22: // ide
 332                         case 33: // ide
 333                         case 34: // ide
 334                         case 56: // ide
 335                         case 57: // ide
 336                         case 88: // ide
 337                         case 89: // ide
 338                         case 90: // ide
 339                         case 91: // ide
 340                                 if(minor % 64) def_enabled = 0; // partitions
 341                                 else def_enabled = enable_new_disks;
 342                                 break;
 343
 344                         case 252: // zram
 345                                 def_enabled = 0;
 346                                 break;
 347
 348                         default:
 349                                 def_enabled = 0;
 350                                 break;
 351                 }
 352 */
 353
 354                 int ddo_io = do_io, ddo_ops = do_ops, ddo_mops = do_mops, ddo_iotime = do_iotime, ddo_qops = do_qops, ddo_util = do_util, ddo_backlog = do_backlog, ddo_space = do_space;
 355
 356                 // check which charts are enabled for this disk
 357                 {
 358                         char var_name[4096 + 1];
 359                         snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 360                         def_enabled = config_get_boolean_ondemand(var_name, "enabled", def_enabled);
 361                         if(def_enabled == CONFIG_ONDEMAND_NO) continue;
 362                         if(def_enabled == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) continue;
 363
 364
 365                         ddo_io          = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 366                         ddo_ops         = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 367                         ddo_mops        = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 368                         ddo_iotime      = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 369                         ddo_qops        = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 370                         ddo_util        = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 371                         ddo_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 372                         ddo_space   = config_get_boolean_ondemand(var_name, "space", ddo_space);
 373
 374                         // by default, do not add charts that do not have values
 375                         if(ddo_io == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) ddo_io = 0;
 376                         if(ddo_mops == CONFIG_ONDEMAND_ONDEMAND && mreads == 0 && mwrites == 0) ddo_mops = 0;
 377                         if(ddo_iotime == CONFIG_ONDEMAND_ONDEMAND && readms == 0 && writems == 0) ddo_iotime = 0;
 378                         if(ddo_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms == 0) ddo_util = 0;
 379                         if(ddo_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_backlog = 0;
 380                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_qops = 0;
 381
 382                         // for absolute values, we need to switch the setting to 'yes'
 383                         // to allow it refresh from now on
 384                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND) config_set(var_name, "queued operations", "yes");
 385                 }
 386
 387                 RRDSET *st;
 388
 389                 // --------------------------------------------------------------------
 390
 391                 int sector_size = 512;
 392                 if(ddo_io) {
 393                         st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 394                         if(!st) {
 395                                 char tf[FILENAME_MAX + 1], *t;
 396                                 char ssfilename[FILENAME_MAX + 1];
 397
 398                                 strncpyz(tf, disk, FILENAME_MAX);
 399
 400                                 // replace all / with !
 401                                 while((t = strchr(tf, '/'))) *t = '!';
 402
 403                                 snprintfz(ssfilename, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 404                                 FILE *fpss = fopen(ssfilename, "r");
 405                                 if(fpss) {
 406                                         char ssbuffer[1025];
 407                                         char *tmp = fgets(ssbuffer, 1024, fpss);
 408
 409                                         if(tmp) {
 410                                                 sector_size = atoi(tmp);
 411                                                 if(sector_size <= 0) {
 412                                                         error("Invalid sector size %d for device %s in %s. Assuming 512.", sector_size, disk, ssfilename);
 413                                                         sector_size = 512;
 414                                                 }
 415                                         }
 416                                         else error("Cannot read data for sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 417
 418                                         fclose(fpss);
 419                                 }
 420                                 else error("Cannot read sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 421
 422                                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 423
 424                                 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_INCREMENTAL);
 425                                 rrddim_add(st, "writes", NULL, sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 426                         }
 427                         else rrdset_next_usec(st, dt);
 428
 429                         last_readsectors  = rrddim_set(st, "reads", readsectors);
 430                         last_writesectors = rrddim_set(st, "writes", writesectors);
 431                         rrdset_done(st);
 432                 }
 433
 434                 // --------------------------------------------------------------------
 435
 436                 if(ddo_ops) {
 437                         st = rrdset_find_bytype("disk_ops", disk);
 438                         if(!st) {
 439                                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 440                                 st->isdetail = 1;
 441
 442                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 443                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 444                         }
 445                         else rrdset_next_usec(st, dt);
 446
 447                         last_reads  = rrddim_set(st, "reads", reads);
 448                         last_writes = rrddim_set(st, "writes", writes);
 449                         rrdset_done(st);
 450                 }
 451
 452                 // --------------------------------------------------------------------
 453
 454                 if(ddo_qops) {
 455                         st = rrdset_find_bytype("disk_qops", disk);
 456                         if(!st) {
 457                                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 458                                 st->isdetail = 1;
 459
 460                                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 461                         }
 462                         else rrdset_next_usec(st, dt);
 463
 464                         rrddim_set(st, "operations", queued_ios);
 465                         rrdset_done(st);
 466                 }
 467
 468                 // --------------------------------------------------------------------
 469
 470                 if(ddo_backlog) {
 471                         st = rrdset_find_bytype("disk_backlog", disk);
 472                         if(!st) {
 473                                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 474                                 st->isdetail = 1;
 475
 476                                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 477                         }
 478                         else rrdset_next_usec(st, dt);
 479
 480                         rrddim_set(st, "backlog", backlog_ms);
 481                         rrdset_done(st);
 482                 }
 483
 484                 // --------------------------------------------------------------------
 485
 486                 if(ddo_util) {
 487                         st = rrdset_find_bytype("disk_util", disk);
 488                         if(!st) {
 489                                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 490                                 st->isdetail = 1;
 491
 492                                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 493                         }
 494                         else rrdset_next_usec(st, dt);
 495
 496                         last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 497                         rrdset_done(st);
 498                 }
 499
 500                 // --------------------------------------------------------------------
 501
 502                 if(ddo_mops) {
 503                         st = rrdset_find_bytype("disk_mops", disk);
 504                         if(!st) {
 505                                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 506                                 st->isdetail = 1;
 507
 508                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 509                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 510                         }
 511                         else rrdset_next_usec(st, dt);
 512
 513                         rrddim_set(st, "reads", mreads);
 514                         rrddim_set(st, "writes", mwrites);
 515                         rrdset_done(st);
 516                 }
 517
 518                 // --------------------------------------------------------------------
 519
 520                 if(ddo_iotime) {
 521                         st = rrdset_find_bytype("disk_iotime", disk);
 522                         if(!st) {
 523                                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 524                                 st->isdetail = 1;
 525
 526                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 527                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 528                         }
 529                         else rrdset_next_usec(st, dt);
 530
 531                         last_readms  = rrddim_set(st, "reads", readms);
 532                         last_writems = rrddim_set(st, "writes", writems);
 533                         rrdset_done(st);
 534                 }
 535
 536                 // --------------------------------------------------------------------
 537
 538                 if(ddo_space) {
 539                         if(mount_point) {
 540                                 st = rrdset_find_bytype("disk_space", disk);
 541                                 if(!st) {
 542                                         st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "Megabyte", 2023, update_every, RRDSET_TYPE_AREA);
 543                                         st->isdetail = 1;
 544
 545                                         rrddim_add(st, "avail", NULL, 1, 1048576, RRDDIM_ABSOLUTE);
 546                                         rrddim_add(st, "reserved for root", NULL, 1, 1048576, RRDDIM_ABSOLUTE);
 547                                         rrddim_add(st, "used" , NULL, 1, 1045576, RRDDIM_ABSOLUTE);
 548                                 }
 549                                 else rrdset_next_usec(st, dt);
 550
 551
 552
 553                                 if (statvfs(family, buff_statvfs) < 0) {
 554                                         error("Faild checking disk space usage of %s", family);
 555                                 } else {
 556                                         space_avail = buff_statvfs->f_bavail * buff_statvfs->f_bsize;
 557                                         space_avail_root = (buff_statvfs->f_bfree - buff_statvfs->f_bavail) * buff_statvfs->f_bsize;
 558                                         space_used = (buff_statvfs->f_blocks - buff_statvfs->f_bfree) * buff_statvfs->f_bsize;
 559                                 }
 560
 561                                 rrddim_set(st, "avail", space_avail);
 562                                 rrddim_set(st, "reserved for root", space_avail_root);
 563                                 rrddim_set(st, "used", space_used);
 564                                 rrdset_done(st);
 565                         } else {
 566                                 if(ddo_space != CONFIG_ONDEMAND_ONDEMAND) {
 567                                         error("Cannot find space usage for disk %s. It does not have a mount point.", family);
 568                                 }
 569                         }
 570                 }
 571
 572                 // --------------------------------------------------------------------
 573                 // calculate differential charts
 574                 // only if this is not the first time we run
 575
 576                 if(dt) {
 577                         if(ddo_iotime && ddo_ops) {
 578                                 st = rrdset_find_bytype("disk_await", disk);
 579                                 if(!st) {
 580                                         st = rrdset_create("disk_await", disk, NULL, family, "disk.await", "Average Completed I/O Operation Time", "ms per operation", 2005, update_every, RRDSET_TYPE_LINE);
 581                                         st->isdetail = 1;
 582
 583                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 584                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 585                                 }
 586                                 else rrdset_next_usec(st, dt);
 587
 588                                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 589                                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 590                                 rrdset_done(st);
 591                         }
 592
 593                         if(ddo_io && ddo_ops) {
 594                                 st = rrdset_find_bytype("disk_avgsz", disk);
 595                                 if(!st) {
 596                                         st = rrdset_create("disk_avgsz", disk, NULL, family, "disk.avgsz", "Average Completed I/O Operation Bandwidth", "kilobytes per operation", 2006, update_every, RRDSET_TYPE_AREA);
 597                                         st->isdetail = 1;
 598
 599                                         rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_ABSOLUTE);
 600                                         rrddim_add(st, "writes", NULL, -sector_size, 1024, RRDDIM_ABSOLUTE);
 601                                 }
 602                                 else rrdset_next_usec(st, dt);
 603
 604                                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 605                                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 606                                 rrdset_done(st);
 607                         }
 608
 609                         if(ddo_util && ddo_ops) {
 610                                 st = rrdset_find_bytype("disk_svctm", disk);
 611                                 if(!st) {
 612                                         st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 613                                         st->isdetail = 1;
 614
 615                                         rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 616                                 }
 617                                 else rrdset_next_usec(st, dt);
 618
 619                                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 620                                 rrdset_done(st);
 621                         }
 622                 }
 623         }
 624         free(buff_statvfs);
 625
 626         return 0;
 627 }