src/proc_diskstats.c

   1 #include "common.h"
   2
   3 #define RRD_TYPE_DISK "disk"
   4
   5 #define DISK_TYPE_PHYSICAL  1
   6 #define DISK_TYPE_PARTITION 2
   7 #define DISK_TYPE_CONTAINER 3
   8
   9 static struct disk {
  10     char *disk;             // the name of the disk (sda, sdb, etc)
  11     unsigned long major;
  12     unsigned long minor;
  13     int sector_size;
  14     int type;
  15     char *mount_point;
  16
  17     // disk options caching
  18     int configured;
  19     int do_io;
  20     int do_ops;
  21     int do_mops;
  22     int do_iotime;
  23     int do_qops;
  24     int do_util;
  25     int do_backlog;
  26     int do_space;
  27     int do_inodes;
  28
  29     struct disk *next;
  30 } *disk_root = NULL;
  31
  32 static struct mountinfo *disk_mountinfo_root = NULL;
  33
  34 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
  35     static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
  36     static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
  37     static char path_find_block_device[FILENAME_MAX + 1] = "";
  38     struct disk *d;
  39
  40     // search for it in our RAM list.
  41     // this is sequential, but since we just walk through
  42     // and the number of disks / partitions in a system
  43     // should not be that many, it should be acceptable
  44     for(d = disk_root; d ; d = d->next)
  45         if(unlikely(d->major == major && d->minor == minor))
  46             break;
  47
  48     // if we found it, return it
  49     if(likely(d))
  50         return d;
  51
  52     // not found
  53     // create a new disk structure
  54     d = (struct disk *)mallocz(sizeof(struct disk));
  55
  56     d->disk = strdupz(disk);
  57     d->major = major;
  58     d->minor = minor;
  59     d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
  60     d->configured = 0;
  61     d->sector_size = 512; // the default, will be changed below
  62     d->next = NULL;
  63
  64     // append it to the list
  65     if(!disk_root)
  66         disk_root = d;
  67     else {
  68         struct disk *last;
  69         for(last = disk_root; last->next ;last = last->next);
  70         last->next = d;
  71     }
  72
  73     // ------------------------------------------------------------------------
  74     // find the type of the device
  75
  76     char buffer[FILENAME_MAX + 1];
  77
  78     // get the default path for finding info about the block device
  79     if(unlikely(!path_find_block_device[0])) {
  80         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
  81         snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", buffer));
  82     }
  83
  84     // find if it is a partition
  85     // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
  86     snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
  87     if(access(buffer, R_OK) == 0) {
  88         d->type = DISK_TYPE_PARTITION;
  89     } else {
  90         // find if it is a container
  91         // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
  92         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
  93         DIR *dirp = opendir(buffer);
  94         if (dirp != NULL) {
  95             struct dirent *dp;
  96             while( (dp = readdir(dirp)) ) {
  97                 // . and .. are also files in empty folders.
  98                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
  99                     continue;
 100                 }
 101
 102                 d->type = DISK_TYPE_CONTAINER;
 103
 104                 // Stop the loop after we found one file.
 105                 break;
 106             }
 107             if(closedir(dirp) == -1)
 108                 error("Unable to close dir %s", buffer);
 109         }
 110     }
 111
 112     // ------------------------------------------------------------------------
 113     // check if we can find its mount point
 114
 115     // mountinfo_find() can be called with NULL disk_mountinfo_root
 116     struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 117     if(unlikely(!mi)) {
 118         // mountinfo_free() can be called with NULL disk_mountinfo_root
 119         mountinfo_free(disk_mountinfo_root);
 120
 121         // re-read mountinfo in case something changed
 122         disk_mountinfo_root = mountinfo_read();
 123
 124         // search again for this disk
 125         mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 126     }
 127
 128     if(mi)
 129         d->mount_point = strdupz(mi->mount_point);
 130         // no need to check for NULL
 131     else
 132         d->mount_point = NULL;
 133
 134     // ------------------------------------------------------------------------
 135     // find the disk sector size
 136
 137     if(!path_to_get_hw_sector_size[0]) {
 138         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 139         snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", buffer));
 140     }
 141     if(!path_to_get_hw_sector_size_partitions[0]) {
 142         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 143         snprintfz(path_to_get_hw_sector_size_partitions, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size for partitions", buffer));
 144     }
 145
 146     {
 147         char tf[FILENAME_MAX + 1], *t;
 148         strncpyz(tf, d->disk, FILENAME_MAX);
 149
 150         // replace all / with !
 151         for(t = tf; *t ;t++)
 152             if(*t == '/') *t = '!';
 153
 154         if(d->type == DISK_TYPE_PARTITION)
 155             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 156         else
 157             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 158
 159         FILE *fpss = fopen(buffer, "r");
 160         if(fpss) {
 161             char buffer2[1024 + 1];
 162             char *tmp = fgets(buffer2, 1024, fpss);
 163
 164             if(tmp) {
 165                 d->sector_size = atoi(tmp);
 166                 if(d->sector_size <= 0) {
 167                     error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 168                     d->sector_size = 512;
 169                 }
 170             }
 171             else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 172
 173             fclose(fpss);
 174         }
 175         else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 176     }
 177
 178     return d;
 179 }
 180
 181 static inline int select_positive_option(int option1, int option2) {
 182     if(option1 == CONFIG_ONDEMAND_YES || option2 == CONFIG_ONDEMAND_YES)
 183         return CONFIG_ONDEMAND_YES;
 184     else if(option1 == CONFIG_ONDEMAND_ONDEMAND || option2 == CONFIG_ONDEMAND_ONDEMAND)
 185         return CONFIG_ONDEMAND_ONDEMAND;
 186
 187     return CONFIG_ONDEMAND_NO;
 188 }
 189
 190 int do_proc_diskstats(int update_every, unsigned long long dt) {
 191     static procfile *ff = NULL;
 192     static struct statvfs buff_statvfs;
 193     static struct stat buff_stat;
 194     static int  global_enable_new_disks_detected_at_runtime = CONFIG_ONDEMAND_YES,
 195                 global_enable_performance_for_physical_disks = CONFIG_ONDEMAND_ONDEMAND,
 196                 global_enable_performance_for_virtual_disks = CONFIG_ONDEMAND_NO,
 197                 global_enable_performance_for_partitions = CONFIG_ONDEMAND_NO,
 198                 global_enable_performance_for_mountpoints = CONFIG_ONDEMAND_NO,
 199                 global_enable_performance_for_virtual_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 200                 global_enable_space_for_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 201                 global_do_io = CONFIG_ONDEMAND_ONDEMAND,
 202                 global_do_ops = CONFIG_ONDEMAND_ONDEMAND,
 203                 global_do_mops = CONFIG_ONDEMAND_ONDEMAND,
 204                 global_do_iotime = CONFIG_ONDEMAND_ONDEMAND,
 205                 global_do_qops = CONFIG_ONDEMAND_ONDEMAND,
 206                 global_do_util = CONFIG_ONDEMAND_ONDEMAND,
 207                 global_do_backlog = CONFIG_ONDEMAND_ONDEMAND,
 208                 global_do_space = CONFIG_ONDEMAND_ONDEMAND,
 209                 global_do_inodes = CONFIG_ONDEMAND_ONDEMAND,
 210                 globals_initialized = 0;
 211
 212     if(unlikely(!globals_initialized)) {
 213         global_enable_new_disks_detected_at_runtime = config_get_boolean("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", global_enable_new_disks_detected_at_runtime);
 214
 215         global_enable_performance_for_physical_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for physical disks", global_enable_performance_for_physical_disks);
 216         global_enable_performance_for_virtual_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for virtual disks", global_enable_performance_for_virtual_disks);
 217         global_enable_performance_for_partitions = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for partitions", global_enable_performance_for_partitions);
 218         global_enable_performance_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted filesystems", global_enable_performance_for_mountpoints);
 219         global_enable_performance_for_virtual_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted virtual disks", global_enable_performance_for_virtual_mountpoints);
 220         global_enable_space_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space metrics for mounted filesystems", global_enable_space_for_mountpoints);
 221
 222         global_do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", global_do_io);
 223         global_do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", global_do_ops);
 224         global_do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", global_do_mops);
 225         global_do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", global_do_iotime);
 226         global_do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", global_do_qops);
 227         global_do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", global_do_util);
 228         global_do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", global_do_backlog);
 229         global_do_space   = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", global_do_space);
 230         global_do_inodes  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", global_do_inodes);
 231
 232         globals_initialized = 1;
 233     }
 234
 235     if(!ff) {
 236         char filename[FILENAME_MAX + 1];
 237         snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 238         ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 239     }
 240     if(!ff) return 1;
 241
 242     ff = procfile_readall(ff);
 243     if(!ff) return 0; // we return 0, so that we will retry to open it next time
 244
 245     uint32_t lines = procfile_lines(ff), l;
 246     uint32_t words;
 247
 248     for(l = 0; l < lines ;l++) {
 249         // --------------------------------------------------------------------------
 250         // Read parameters
 251
 252         char *disk;
 253         unsigned long long  major = 0, minor = 0,
 254                             reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 255                             writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 256                             queued_ios = 0, busy_ms = 0, backlog_ms = 0,
 257                             space_avail = 0, space_avail_root = 0, space_used = 0,
 258                             inodes_avail = 0, inodes_avail_root = 0, inodes_used = 0;
 259
 260         unsigned long long  last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 261                             last_writes = 0, last_writesectors = 0, last_writems = 0,
 262                             last_busy_ms = 0;
 263
 264         words = procfile_linewords(ff, l);
 265         if(words < 14) continue;
 266
 267         major           = strtoull(procfile_lineword(ff, l, 0), NULL, 10);
 268         minor           = strtoull(procfile_lineword(ff, l, 1), NULL, 10);
 269         disk            = procfile_lineword(ff, l, 2);
 270
 271         // # of reads completed # of writes completed
 272         // This is the total number of reads or writes completed successfully.
 273         reads           = strtoull(procfile_lineword(ff, l, 3), NULL, 10);  // rd_ios
 274         writes          = strtoull(procfile_lineword(ff, l, 7), NULL, 10);  // wr_ios
 275
 276         // # of reads merged # of writes merged
 277         // Reads and writes which are adjacent to each other may be merged for
 278         // efficiency.  Thus two 4K reads may become one 8K read before it is
 279         // ultimately handed to the disk, and so it will be counted (and queued)
 280         mreads          = strtoull(procfile_lineword(ff, l, 4), NULL, 10);  // rd_merges_or_rd_sec
 281         mwrites         = strtoull(procfile_lineword(ff, l, 8), NULL, 10);  // wr_merges
 282
 283         // # of sectors read # of sectors written
 284         // This is the total number of sectors read or written successfully.
 285         readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);  // rd_sec_or_wr_ios
 286         writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);  // wr_sec
 287
 288         // # of milliseconds spent reading # of milliseconds spent writing
 289         // This is the total number of milliseconds spent by all reads or writes (as
 290         // measured from __make_request() to end_that_request_last()).
 291         readms          = strtoull(procfile_lineword(ff, l, 6), NULL, 10);  // rd_ticks_or_wr_sec
 292         writems         = strtoull(procfile_lineword(ff, l, 10), NULL, 10); // wr_ticks
 293
 294         // # of I/Os currently in progress
 295         // The only field that should go to zero. Incremented as requests are
 296         // given to appropriate struct request_queue and decremented as they finish.
 297         queued_ios      = strtoull(procfile_lineword(ff, l, 11), NULL, 10); // ios_pgr
 298
 299         // # of milliseconds spent doing I/Os
 300         // This field increases so long as field queued_ios is nonzero.
 301         busy_ms         = strtoull(procfile_lineword(ff, l, 12), NULL, 10); // tot_ticks
 302
 303         // weighted # of milliseconds spent doing I/Os
 304         // This field is incremented at each I/O start, I/O completion, I/O
 305         // merge, or read of these stats by the number of I/Os in progress
 306         // (field queued_ios) times the number of milliseconds spent doing I/O since the
 307         // last update of this field.  This can provide an easy measure of both
 308         // I/O completion time and the backlog that may be accumulating.
 309         backlog_ms      = strtoull(procfile_lineword(ff, l, 13), NULL, 10); // rq_ticks
 310
 311
 312         // --------------------------------------------------------------------------
 313         // remove slashes from disk names
 314         char *s;
 315         for(s = disk; *s ;s++)
 316             if(*s == '/') *s = '_';
 317
 318         // --------------------------------------------------------------------------
 319         // get a disk structure for the disk
 320
 321         struct disk *d = get_disk(major, minor, disk);
 322
 323
 324         // --------------------------------------------------------------------------
 325         // Set its family based on mount point
 326
 327         char *family = d->mount_point;
 328         if(!family) family = disk;
 329
 330
 331         // --------------------------------------------------------------------------
 332         // Check the configuration for the device
 333
 334         if(unlikely(!d->configured)) {
 335             char var_name[4096 + 1];
 336             snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 337
 338             int def_enable = config_get_boolean_ondemand(var_name, "enable", global_enable_new_disks_detected_at_runtime);
 339             if(def_enable == CONFIG_ONDEMAND_NO) {
 340                 // the user does not want any metrics for this disk
 341                 d->do_io = CONFIG_ONDEMAND_NO;
 342                 d->do_ops = CONFIG_ONDEMAND_NO;
 343                 d->do_mops = CONFIG_ONDEMAND_NO;
 344                 d->do_iotime = CONFIG_ONDEMAND_NO;
 345                 d->do_qops = CONFIG_ONDEMAND_NO;
 346                 d->do_util = CONFIG_ONDEMAND_NO;
 347                 d->do_backlog = CONFIG_ONDEMAND_NO;
 348                 d->do_space = CONFIG_ONDEMAND_NO;
 349                 d->do_inodes = CONFIG_ONDEMAND_NO;
 350             }
 351             else {
 352                 // this disk is enabled
 353                 // check its direct settings
 354
 355                 int def_performance = CONFIG_ONDEMAND_ONDEMAND;
 356                 int def_space = (d->mount_point)?CONFIG_ONDEMAND_ONDEMAND:CONFIG_ONDEMAND_NO;
 357
 358                 // since this is 'on demand' we can figure the performance settings
 359                 // based on the type of disk
 360
 361                 switch(d->type) {
 362                     case DISK_TYPE_PHYSICAL:
 363                         def_performance = global_enable_performance_for_physical_disks;
 364                         break;
 365
 366                     case DISK_TYPE_PARTITION:
 367                         def_performance = global_enable_performance_for_partitions;
 368                         break;
 369
 370                     case DISK_TYPE_CONTAINER:
 371                         def_performance = global_enable_performance_for_virtual_disks;
 372
 373                         if(d->mount_point)
 374                             def_performance = select_positive_option(def_performance, global_enable_performance_for_virtual_mountpoints);
 375
 376                         break;
 377                 }
 378
 379                 if(d->mount_point)
 380                     def_performance = select_positive_option(def_performance, global_enable_performance_for_mountpoints);
 381
 382                 // ------------------------------------------------------------
 383                 // now we have def_performance and def_space
 384                 // to work further
 385
 386                 // def_performance
 387                 // check the user configuration (this will also show our 'on demand' decision)
 388                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 389
 390                 int ddo_io = CONFIG_ONDEMAND_NO,
 391                     ddo_ops = CONFIG_ONDEMAND_NO,
 392                     ddo_mops = CONFIG_ONDEMAND_NO,
 393                     ddo_iotime = CONFIG_ONDEMAND_NO,
 394                     ddo_qops = CONFIG_ONDEMAND_NO,
 395                     ddo_util = CONFIG_ONDEMAND_NO,
 396                     ddo_backlog = CONFIG_ONDEMAND_NO;
 397
 398                 // we enable individual performance charts only when def_performance is not disabled
 399                 if(def_performance != CONFIG_ONDEMAND_NO) {
 400                     ddo_io = global_do_io,
 401                     ddo_ops = global_do_ops,
 402                     ddo_mops = global_do_mops,
 403                     ddo_iotime = global_do_iotime,
 404                     ddo_qops = global_do_qops,
 405                     ddo_util = global_do_util,
 406                     ddo_backlog = global_do_backlog;
 407                 }
 408
 409                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 410                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 411                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 412                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 413                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 414                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 415                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 416
 417                 // def_space
 418                 if(d->mount_point) {
 419                     // check the user configuration (this will also show our 'on demand' decision)
 420                     def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 421
 422                     int ddo_space = def_space,
 423                         ddo_inodes = def_space;
 424
 425                     d->do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 426                     d->do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 427                 }
 428                 else {
 429                     // don't show settings for this disk
 430                     d->do_space = CONFIG_ONDEMAND_NO;
 431                     d->do_inodes = CONFIG_ONDEMAND_NO;
 432                 }
 433             }
 434
 435             d->configured = 1;
 436         }
 437
 438         RRDSET *st;
 439
 440         // --------------------------------------------------------------------------
 441         // Do performance metrics
 442
 443         if(d->do_io == CONFIG_ONDEMAND_YES || (d->do_io == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) {
 444             d->do_io = CONFIG_ONDEMAND_YES;
 445
 446             st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 447             if(!st) {
 448                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 449
 450                 rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_INCREMENTAL);
 451                 rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 452             }
 453             else rrdset_next_usec(st, dt);
 454
 455             last_readsectors  = rrddim_set(st, "reads", readsectors);
 456             last_writesectors = rrddim_set(st, "writes", writesectors);
 457             rrdset_done(st);
 458         }
 459
 460         // --------------------------------------------------------------------
 461
 462         if(d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes))) {
 463             d->do_ops = CONFIG_ONDEMAND_YES;
 464
 465             st = rrdset_find_bytype("disk_ops", disk);
 466             if(!st) {
 467                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 468                 st->isdetail = 1;
 469
 470                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 471                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 472             }
 473             else rrdset_next_usec(st, dt);
 474
 475             last_reads  = rrddim_set(st, "reads", reads);
 476             last_writes = rrddim_set(st, "writes", writes);
 477             rrdset_done(st);
 478         }
 479
 480         // --------------------------------------------------------------------
 481
 482         if(d->do_qops == CONFIG_ONDEMAND_YES || (d->do_qops == CONFIG_ONDEMAND_ONDEMAND && queued_ios)) {
 483             d->do_qops = CONFIG_ONDEMAND_YES;
 484
 485             st = rrdset_find_bytype("disk_qops", disk);
 486             if(!st) {
 487                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 488                 st->isdetail = 1;
 489
 490                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 491             }
 492             else rrdset_next_usec(st, dt);
 493
 494             rrddim_set(st, "operations", queued_ios);
 495             rrdset_done(st);
 496         }
 497
 498         // --------------------------------------------------------------------
 499
 500         if(d->do_backlog == CONFIG_ONDEMAND_YES || (d->do_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms)) {
 501             d->do_backlog = CONFIG_ONDEMAND_YES;
 502
 503             st = rrdset_find_bytype("disk_backlog", disk);
 504             if(!st) {
 505                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 506                 st->isdetail = 1;
 507
 508                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 509             }
 510             else rrdset_next_usec(st, dt);
 511
 512             rrddim_set(st, "backlog", backlog_ms);
 513             rrdset_done(st);
 514         }
 515
 516         // --------------------------------------------------------------------
 517
 518         if(d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) {
 519             d->do_util = CONFIG_ONDEMAND_YES;
 520
 521             st = rrdset_find_bytype("disk_util", disk);
 522             if(!st) {
 523                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 524                 st->isdetail = 1;
 525
 526                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 527             }
 528             else rrdset_next_usec(st, dt);
 529
 530             last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 531             rrdset_done(st);
 532         }
 533
 534         // --------------------------------------------------------------------
 535
 536         if(d->do_mops == CONFIG_ONDEMAND_YES || (d->do_mops == CONFIG_ONDEMAND_ONDEMAND && (mreads || mwrites))) {
 537             d->do_mops = CONFIG_ONDEMAND_YES;
 538
 539             st = rrdset_find_bytype("disk_mops", disk);
 540             if(!st) {
 541                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 542                 st->isdetail = 1;
 543
 544                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 545                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 546             }
 547             else rrdset_next_usec(st, dt);
 548
 549             rrddim_set(st, "reads", mreads);
 550             rrddim_set(st, "writes", mwrites);
 551             rrdset_done(st);
 552         }
 553
 554         // --------------------------------------------------------------------
 555
 556         if(d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) {
 557             d->do_iotime = CONFIG_ONDEMAND_YES;
 558
 559             st = rrdset_find_bytype("disk_iotime", disk);
 560             if(!st) {
 561                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 562                 st->isdetail = 1;
 563
 564                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 565                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 566             }
 567             else rrdset_next_usec(st, dt);
 568
 569             last_readms  = rrddim_set(st, "reads", readms);
 570             last_writems = rrddim_set(st, "writes", writems);
 571             rrdset_done(st);
 572         }
 573
 574         // --------------------------------------------------------------------
 575         // calculate differential charts
 576         // only if this is not the first time we run
 577
 578         if(dt) {
 579             if( (d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) &&
 580                 (d->do_ops    == CONFIG_ONDEMAND_YES || (d->do_ops    == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 581                 st = rrdset_find_bytype("disk_await", disk);
 582                 if(!st) {
 583                     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);
 584                     st->isdetail = 1;
 585
 586                     rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 587                     rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 588                 }
 589                 else rrdset_next_usec(st, dt);
 590
 591                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 592                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 593                 rrdset_done(st);
 594             }
 595
 596             if( (d->do_io  == CONFIG_ONDEMAND_YES || (d->do_io  == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) &&
 597                 (d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 598                 st = rrdset_find_bytype("disk_avgsz", disk);
 599                 if(!st) {
 600                     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);
 601                     st->isdetail = 1;
 602
 603                     rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_ABSOLUTE);
 604                     rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_ABSOLUTE);
 605                 }
 606                 else rrdset_next_usec(st, dt);
 607
 608                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 609                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 610                 rrdset_done(st);
 611             }
 612
 613             if( (d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) &&
 614                 (d->do_ops  == CONFIG_ONDEMAND_YES || (d->do_ops  == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 615                 st = rrdset_find_bytype("disk_svctm", disk);
 616                 if(!st) {
 617                     st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 618                     st->isdetail = 1;
 619
 620                     rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 621                 }
 622                 else rrdset_next_usec(st, dt);
 623
 624                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 625                 rrdset_done(st);
 626             }
 627         }
 628
 629         // --------------------------------------------------------------------------
 630         // space metrics
 631
 632         if(d->mount_point && (d->do_space || d->do_inodes) ) {
 633             // collect space metrics using statvfs
 634
 635             if (statvfs(d->mount_point, &buff_statvfs) < 0)
 636                 error("Failed statvfs() for '%s' (disk '%s')", d->mount_point, d->disk);
 637             else {
 638                 space_avail = buff_statvfs.f_bavail * buff_statvfs.f_bsize;
 639                 space_avail_root = (buff_statvfs.f_bfree - buff_statvfs.f_bavail) * buff_statvfs.f_bsize;
 640                 space_used = (buff_statvfs.f_blocks - buff_statvfs.f_bfree) * buff_statvfs.f_bsize;
 641
 642                 inodes_avail = buff_statvfs.f_favail;
 643                 inodes_avail_root = buff_statvfs.f_ffree - buff_statvfs.f_favail;
 644                 inodes_used = buff_statvfs.f_files - buff_statvfs.f_ffree;
 645
 646                 // verify we collected the metrics for the right disk.
 647                 // if not the mountpoint has changed.
 648
 649                 if(stat(d->mount_point, &buff_stat) == -1)
 650                     error("Failed to stat() for '%s' (disk '%s')", d->mount_point, d->disk);
 651                 else {
 652                     if(major(buff_stat.st_dev) == major && minor(buff_stat.st_dev) == minor) {
 653
 654                         // --------------------------------------------------------------------------
 655
 656                         if(d->do_space == CONFIG_ONDEMAND_YES || (d->do_space == CONFIG_ONDEMAND_ONDEMAND && (space_avail || space_avail_root || space_used))) {
 657                             st = rrdset_find_bytype("disk_space", disk);
 658                             if(!st) {
 659                                 st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 660                                 st->isdetail = 1;
 661
 662                                 rrddim_add(st, "avail", NULL, 1, 1024*1024*1024, RRDDIM_ABSOLUTE);
 663                                 rrddim_add(st, "used" , NULL, 1, 1024*1024*1024, RRDDIM_ABSOLUTE);
 664                                 rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1024*1024*1024, RRDDIM_ABSOLUTE);
 665                             }
 666                             else rrdset_next_usec(st, dt);
 667
 668                             rrddim_set(st, "avail", space_avail);
 669                             rrddim_set(st, "used", space_used);
 670                             rrddim_set(st, "reserved_for_root", space_avail_root);
 671                             rrdset_done(st);
 672                         }
 673
 674                         // --------------------------------------------------------------------------
 675
 676                         if(d->do_inodes == CONFIG_ONDEMAND_YES || (d->do_inodes == CONFIG_ONDEMAND_ONDEMAND && (inodes_avail || inodes_avail_root || inodes_used))) {
 677                             st = rrdset_find_bytype("disk_inodes", disk);
 678                             if(!st) {
 679                                 st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", "Disk Inodes Usage", "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 680                                 st->isdetail = 1;
 681
 682                                 rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 683                                 rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 684                                 rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 685                             }
 686                             else rrdset_next_usec(st, dt);
 687
 688                             rrddim_set(st, "avail", inodes_avail);
 689                             rrddim_set(st, "used", inodes_used);
 690                             rrddim_set(st, "reserved_for_root", inodes_avail_root);
 691                             rrdset_done(st);
 692                         }
 693                     }
 694                 }
 695             }
 696         }
 697     }
 698
 699     return 0;
 700 }