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
 224                 /*
 225                 if(d->partition_id == -1)
 226                         def_enabled = enable_new_disks;
 227                 else
 228                         def_enabled = 0;
 229                 */
 230
 231                 // Enable real disks by default.
 232                 // To fine out if it is a harddrive we use
 233                 // Linux Assigned Names and Numbers Authority (http://www.lanana.org/)
 234                 switch(major) {
 235                         case 8: // SCSI disk devices (0-15)
 236                                 if(!(minor % 16)) {
 237                                         def_enabled = enable_new_disks;
 238                                 }
 239                                 break;
 240                         case 21: // Acorn MFM hard drive interface
 241                                 if(!(minor % 64)) {
 242                                         def_enabled = enable_new_disks;
 243                                 }
 244                                 break;
 245                         case 28: // ACSI disk (68k/Atari)
 246                                 if(!(minor % 16)) {
 247                                         def_enabled = enable_new_disks;
 248                                 }
 249                                 break;
 250                         case 36: // MCA ESDI hard disk
 251                                 if(!(minor % 64)) {
 252                                         def_enabled = enable_new_disks;
 253                                 }
 254                                 break;
 255                         case 48: // Mylex DAC960 PCI RAID controller; first controller
 256                                 if(!(minor % 8)) {
 257                                         def_enabled = enable_new_disks;
 258                                 }
 259                                 break;
 260                         case 49: // Mylex DAC960 PCI RAID controller; second controller
 261                                 if(!(minor % 8)) {
 262                                         def_enabled = enable_new_disks;
 263                                 }
 264                                 break;
 265                         case 50: // Mylex DAC960 PCI RAID controller; third controller
 266                                 if(!(minor % 8)) {
 267                                         def_enabled = enable_new_disks;
 268                                 }
 269                                 break;
 270                         case 51: // Mylex DAC960 PCI RAID controller; fourth controller
 271                                 if(!(minor % 8)) {
 272                                         def_enabled = enable_new_disks;
 273                                 }
 274                                 break;
 275                         case 52: // Mylex DAC960 PCI RAID controller; fifth controller
 276                                 if(!(minor % 8)) {
 277                                         def_enabled = enable_new_disks;
 278                                 }
 279                                 break;
 280                         case 53: // Mylex DAC960 PCI RAID controller; sixth controller
 281                                 if(!(minor % 8)) {
 282                                         def_enabled = enable_new_disks;
 283                                 }
 284                                 break;
 285                         case 54: // Mylex DAC960 PCI RAID controller; seventh controller
 286                                 if(!(minor % 8)) {
 287                                         def_enabled = enable_new_disks;
 288                                 }
 289                                 break;
 290                         case 55: // Mylex DAC960 PCI RAID controller; eigth controller
 291                                 if(!(minor % 8)) {
 292                                         def_enabled = enable_new_disks;
 293                                 }
 294                                 break;
 295                         case 65: // SCSI disk devices (16-31)
 296                                 if(!(minor % 16)) {
 297                                         def_enabled = enable_new_disks;
 298                                 }
 299                                 break;
 300                         case 66: // SCSI disk devices (32-47)
 301                                 if(!(minor % 16)) {
 302                                         def_enabled = enable_new_disks;
 303                                 }
 304                                 break;
 305                         case 67: // SCSI disk devices (48-63)
 306                                 if(!(minor % 16)) {
 307                                         def_enabled = enable_new_disks;
 308                                 }
 309                                 break;
 310                         case 68: // SCSI disk devices (64-79)
 311                                 if(!(minor % 16)) {
 312                                         def_enabled = enable_new_disks;
 313                                 }
 314                                 break;
 315                         case 69: // SCSI disk devices (80-95)
 316                                 if(!(minor % 16)) {
 317                                         def_enabled = enable_new_disks;
 318                                 }
 319                                 break;
 320                         case 70: // SCSI disk devices (96-111)
 321                                 if(!(minor % 16)) {
 322                                         def_enabled = enable_new_disks;
 323                                 }
 324                                 break;
 325                         case 71: // SCSI disk devices (112-127)
 326                                 if(!(minor % 16)) {
 327                                         def_enabled = enable_new_disks;
 328                                 }
 329                                 break;
 330                         case 80: // I2O hard disk
 331                                 if(!(minor % 16)) {
 332                                         def_enabled = enable_new_disks;
 333                                 }
 334                                 break;
 335                         case 81: // I2O hard disk
 336                                 if(!(minor % 16)) {
 337                                         def_enabled = enable_new_disks;
 338                                 }
 339                                 break;
 340                         case 82: // I2O hard disk
 341                                 if(!(minor % 16)) {
 342                                         def_enabled = enable_new_disks;
 343                                 }
 344                                 break;
 345                         case 83: // I2O hard disk
 346                                 if(!(minor % 16)) {
 347                                         def_enabled = enable_new_disks;
 348                                 }
 349                                 break;
 350                         case 84: // I2O hard disk
 351                                 if(!(minor % 16)) {
 352                                         def_enabled = enable_new_disks;
 353                                 }
 354                                 break;
 355                         case 85: // I2O hard disk
 356                                 if(!(minor % 16)) {
 357                                         def_enabled = enable_new_disks;
 358                                 }
 359                                 break;
 360                         case 86: // I2O hard disk
 361                                 if(!(minor % 16)) {
 362                                         def_enabled = enable_new_disks;
 363                                 }
 364                                 break;
 365                         case 87: // I2O hard disk
 366                                 if(!(minor % 16)) {
 367                                         def_enabled = enable_new_disks;
 368                                 }
 369                                 break;
 370                         case 128: // SCSI disk devices (128-143)
 371                                 if(!(minor % 16)) {
 372                                         def_enabled = enable_new_disks;
 373                                 }
 374                                 break;
 375                         case 129: // SCSI disk devices (144-159)
 376                                 if(!(minor % 16)) {
 377                                         def_enabled = enable_new_disks;
 378                                 }
 379                                 break;
 380                         case 130: // SCSI disk devices (160-175)
 381                                 if(!(minor % 16)) {
 382                                         def_enabled = enable_new_disks;
 383                                 }
 384                                 break;
 385                         case 131: // SCSI disk devices (176-191)
 386                                 if(!(minor % 16)) {
 387                                         def_enabled = enable_new_disks;
 388                                 }
 389                                 break;
 390                         case 132: // SCSI disk devices (192-207)
 391                                 if(!(minor % 16)) {
 392                                         def_enabled = enable_new_disks;
 393                                 }
 394                                 break;
 395                         case 133: // SCSI disk devices (208-223)
 396                                 if(!(minor % 16)) {
 397                                         def_enabled = enable_new_disks;
 398                                 }
 399                                 break;
 400                         case 134: // SCSI disk devices (224-239)
 401                                 if(!(minor % 16)) {
 402                                         def_enabled = enable_new_disks;
 403                                 }
 404                                 break;
 405                         case 135: // SCSI disk devices (240-255)
 406                                 if(!(minor % 16)) {
 407                                         def_enabled = enable_new_disks;
 408                                 }
 409                                 break;
 410                         case 136: // Mylex DAC960 PCI RAID controller; nineth controller
 411                                 if(!(minor % 8)) {
 412                                         def_enabled = enable_new_disks;
 413                                 }
 414                                 break;
 415                         case 137: // Mylex DAC960 PCI RAID controller; tenth controller
 416                                 if(!(minor % 8)) {
 417                                         def_enabled = enable_new_disks;
 418                                 }
 419                                 break;
 420                         case 138: // Mylex DAC960 PCI RAID controller; eleventh controller
 421                                 if(!(minor % 8)) {
 422                                         def_enabled = enable_new_disks;
 423                                 }
 424                                 break;
 425                         case 139: // Mylex DAC960 PCI RAID controller; twelfth controller
 426                                 if(!(minor % 8)) {
 427                                         def_enabled = enable_new_disks;
 428                                 }
 429                                 break;
 430                         case 140: // Mylex DAC960 PCI RAID controller; thirteenth controller
 431                                 if(!(minor % 8)) {
 432                                         def_enabled = enable_new_disks;
 433                                 }
 434                                 break;
 435                         case 141: // Mylex DAC960 PCI RAID controller; fourteenth controller
 436                                 if(!(minor % 8)) {
 437                                         def_enabled = enable_new_disks;
 438                                 }
 439                                 break;
 440                         case 142: // Mylex DAC960 PCI RAID controller; fifteenth controller
 441                                 if(!(minor % 8)) {
 442                                         def_enabled = enable_new_disks;
 443                                 }
 444                                 break;
 445                         case 143: // Mylex DAC960 PCI RAID controller; sixteenth controller
 446                                 if(!(minor % 8)) {
 447                                         def_enabled = enable_new_disks;
 448                                 }
 449                                 break;
 450                         case 160: // Carmel 8-port SATA Disks on First Controller
 451                                 if(!(minor % 32)) {
 452                                         def_enabled = enable_new_disks;
 453                                 }
 454                                 break;
 455                         case 161: // Carmel 8-port SATA Disks on Second Controller
 456                                 if(!(minor % 32)) {
 457                                         def_enabled = enable_new_disks;
 458                                 }
 459                                 break;
 460                         default:
 461                                 def_enabled = 0;
 462                                 break;
 463                 }
 464
 465                 char *mount_point = d->mount_point;
 466                 char *family = d->mount_point;
 467                 if(!family) family = disk;
 468
 469                 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;
 470
 471                 // check which charts are enabled for this disk
 472                 {
 473                         char var_name[4096 + 1];
 474                         snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 475                         def_enabled = config_get_boolean_ondemand(var_name, "enabled", def_enabled);
 476                         if(def_enabled == CONFIG_ONDEMAND_NO) continue;
 477                         if(def_enabled == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) continue;
 478
 479
 480                         ddo_io          = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 481                         ddo_ops         = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 482                         ddo_mops        = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 483                         ddo_iotime      = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 484                         ddo_qops        = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 485                         ddo_util        = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 486                         ddo_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 487                         ddo_space   = config_get_boolean_ondemand(var_name, "space", ddo_space);
 488
 489                         // by default, do not add charts that do not have values
 490                         if(ddo_io == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) ddo_io = 0;
 491                         if(ddo_mops == CONFIG_ONDEMAND_ONDEMAND && mreads == 0 && mwrites == 0) ddo_mops = 0;
 492                         if(ddo_iotime == CONFIG_ONDEMAND_ONDEMAND && readms == 0 && writems == 0) ddo_iotime = 0;
 493                         if(ddo_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms == 0) ddo_util = 0;
 494                         if(ddo_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_backlog = 0;
 495                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_qops = 0;
 496
 497                         // for absolute values, we need to switch the setting to 'yes'
 498                         // to allow it refresh from now on
 499                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND) config_set(var_name, "queued operations", "yes");
 500                 }
 501
 502                 RRDSET *st;
 503
 504                 // --------------------------------------------------------------------
 505
 506                 int sector_size = 512;
 507                 if(ddo_io) {
 508                         st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 509                         if(!st) {
 510                                 char tf[FILENAME_MAX + 1], *t;
 511                                 char ssfilename[FILENAME_MAX + 1];
 512
 513                                 strncpyz(tf, disk, FILENAME_MAX);
 514
 515                                 // replace all / with !
 516                                 while((t = strchr(tf, '/'))) *t = '!';
 517
 518                                 snprintfz(ssfilename, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 519                                 FILE *fpss = fopen(ssfilename, "r");
 520                                 if(fpss) {
 521                                         char ssbuffer[1025];
 522                                         char *tmp = fgets(ssbuffer, 1024, fpss);
 523
 524                                         if(tmp) {
 525                                                 sector_size = atoi(tmp);
 526                                                 if(sector_size <= 0) {
 527                                                         error("Invalid sector size %d for device %s in %s. Assuming 512.", sector_size, disk, ssfilename);
 528                                                         sector_size = 512;
 529                                                 }
 530                                         }
 531                                         else error("Cannot read data for sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 532
 533                                         fclose(fpss);
 534                                 }
 535                                 else error("Cannot read sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 536
 537                                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 538
 539                                 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_INCREMENTAL);
 540                                 rrddim_add(st, "writes", NULL, sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 541                         }
 542                         else rrdset_next_usec(st, dt);
 543
 544                         last_readsectors  = rrddim_set(st, "reads", readsectors);
 545                         last_writesectors = rrddim_set(st, "writes", writesectors);
 546                         rrdset_done(st);
 547                 }
 548
 549                 // --------------------------------------------------------------------
 550
 551                 if(ddo_ops) {
 552                         st = rrdset_find_bytype("disk_ops", disk);
 553                         if(!st) {
 554                                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 555                                 st->isdetail = 1;
 556
 557                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 558                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 559                         }
 560                         else rrdset_next_usec(st, dt);
 561
 562                         last_reads  = rrddim_set(st, "reads", reads);
 563                         last_writes = rrddim_set(st, "writes", writes);
 564                         rrdset_done(st);
 565                 }
 566
 567                 // --------------------------------------------------------------------
 568
 569                 if(ddo_qops) {
 570                         st = rrdset_find_bytype("disk_qops", disk);
 571                         if(!st) {
 572                                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 573                                 st->isdetail = 1;
 574
 575                                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 576                         }
 577                         else rrdset_next_usec(st, dt);
 578
 579                         rrddim_set(st, "operations", queued_ios);
 580                         rrdset_done(st);
 581                 }
 582
 583                 // --------------------------------------------------------------------
 584
 585                 if(ddo_backlog) {
 586                         st = rrdset_find_bytype("disk_backlog", disk);
 587                         if(!st) {
 588                                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 589                                 st->isdetail = 1;
 590
 591                                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 592                         }
 593                         else rrdset_next_usec(st, dt);
 594
 595                         rrddim_set(st, "backlog", backlog_ms);
 596                         rrdset_done(st);
 597                 }
 598
 599                 // --------------------------------------------------------------------
 600
 601                 if(ddo_util) {
 602                         st = rrdset_find_bytype("disk_util", disk);
 603                         if(!st) {
 604                                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 605                                 st->isdetail = 1;
 606
 607                                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 608                         }
 609                         else rrdset_next_usec(st, dt);
 610
 611                         last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 612                         rrdset_done(st);
 613                 }
 614
 615                 // --------------------------------------------------------------------
 616
 617                 if(ddo_mops) {
 618                         st = rrdset_find_bytype("disk_mops", disk);
 619                         if(!st) {
 620                                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 621                                 st->isdetail = 1;
 622
 623                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 624                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 625                         }
 626                         else rrdset_next_usec(st, dt);
 627
 628                         rrddim_set(st, "reads", mreads);
 629                         rrddim_set(st, "writes", mwrites);
 630                         rrdset_done(st);
 631                 }
 632
 633                 // --------------------------------------------------------------------
 634
 635                 if(ddo_iotime) {
 636                         st = rrdset_find_bytype("disk_iotime", disk);
 637                         if(!st) {
 638                                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 639                                 st->isdetail = 1;
 640
 641                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 642                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 643                         }
 644                         else rrdset_next_usec(st, dt);
 645
 646                         last_readms  = rrddim_set(st, "reads", readms);
 647                         last_writems = rrddim_set(st, "writes", writems);
 648                         rrdset_done(st);
 649                 }
 650
 651                 // --------------------------------------------------------------------
 652
 653                 if(ddo_space) {
 654                         if(mount_point) {
 655                                 st = rrdset_find_bytype("disk_space", disk);
 656                                 if(!st) {
 657                                         st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "Megabyte", 2023, update_every, RRDSET_TYPE_AREA);
 658                                         st->isdetail = 1;
 659
 660                                         rrddim_add(st, "avail", NULL, 1, 1048576, RRDDIM_ABSOLUTE);
 661                                         rrddim_add(st, "reserved for root", NULL, 1, 1048576, RRDDIM_ABSOLUTE);
 662                                         rrddim_add(st, "used" , NULL, 1, 1045576, RRDDIM_ABSOLUTE);
 663                                 }
 664                                 else rrdset_next_usec(st, dt);
 665
 666
 667
 668                                 if (statvfs(family, buff_statvfs) < 0) {
 669                                         error("Faild checking disk space usage of %s", family);
 670                                 } else {
 671                                         space_avail = buff_statvfs->f_bavail * buff_statvfs->f_bsize;
 672                                         space_avail_root = (buff_statvfs->f_bfree - buff_statvfs->f_bavail) * buff_statvfs->f_bsize;
 673                                         space_used = (buff_statvfs->f_blocks - buff_statvfs->f_bfree) * buff_statvfs->f_bsize;
 674                                 }
 675
 676                                 rrddim_set(st, "avail", space_avail);
 677                                 rrddim_set(st, "reserved for root", space_avail_root);
 678                                 rrddim_set(st, "used", space_used);
 679                                 rrdset_done(st);
 680                         } else {
 681                                 if(ddo_space != CONFIG_ONDEMAND_ONDEMAND) {
 682                                         error("Cannot find space usage for disk %s. It does not have a mount point.", family);
 683                                 }
 684                         }
 685                 }
 686
 687                 // --------------------------------------------------------------------
 688                 // calculate differential charts
 689                 // only if this is not the first time we run
 690
 691                 if(dt) {
 692                         if(ddo_iotime && ddo_ops) {
 693                                 st = rrdset_find_bytype("disk_await", disk);
 694                                 if(!st) {
 695                                         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);
 696                                         st->isdetail = 1;
 697
 698                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 699                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 700                                 }
 701                                 else rrdset_next_usec(st, dt);
 702
 703                                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 704                                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 705                                 rrdset_done(st);
 706                         }
 707
 708                         if(ddo_io && ddo_ops) {
 709                                 st = rrdset_find_bytype("disk_avgsz", disk);
 710                                 if(!st) {
 711                                         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);
 712                                         st->isdetail = 1;
 713
 714                                         rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_ABSOLUTE);
 715                                         rrddim_add(st, "writes", NULL, -sector_size, 1024, RRDDIM_ABSOLUTE);
 716                                 }
 717                                 else rrdset_next_usec(st, dt);
 718
 719                                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 720                                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 721                                 rrdset_done(st);
 722                         }
 723
 724                         if(ddo_util && ddo_ops) {
 725                                 st = rrdset_find_bytype("disk_svctm", disk);
 726                                 if(!st) {
 727                                         st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 728                                         st->isdetail = 1;
 729
 730                                         rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 731                                 }
 732                                 else rrdset_next_usec(st, dt);
 733
 734                                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 735                                 rrdset_done(st);
 736                         }
 737                 }
 738         }
 739         free(buff_statvfs);
 740
 741         return 0;
 742 }