src/proc_diskstats.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <dirent.h>
   5 #include <fcntl.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <sys/statvfs.h>
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13
  14
  15 #include "common.h"
  16 #include "log.h"
  17 #include "appconfig.h"
  18 #include "procfile.h"
  19 #include "rrd.h"
  20 #include "plugin_proc.h"
  21
  22 #include "proc_self_mountinfo.h"
  23
  24 #define RRD_TYPE_DISK "disk"
  25
  26 #define DISK_TYPE_PHYSICAL  1
  27 #define DISK_TYPE_PARTITION 2
  28 #define DISK_TYPE_CONTAINER 3
  29
  30 struct disk {
  31         unsigned long major;
  32         unsigned long minor;
  33         int type;
  34         char *mount_point;
  35         struct disk *next;
  36 } *disk_root = NULL;
  37
  38 struct disk *get_disk(unsigned long major, unsigned long minor) {
  39         static char path_find_block_device[FILENAME_MAX + 1] = "";
  40         static struct mountinfo *mountinfo_root = NULL;
  41         struct disk *d;
  42
  43         // search for it in our RAM list.
  44         // this is sequential, but since we just walk through
  45         // and the number of disks / partitions in a system
  46         // should not be that many, it should be acceptable
  47         for(d = disk_root; d ; d = d->next)
  48                 if(unlikely(d->major == major && d->minor == minor))
  49                         break;
  50
  51         // if we found it, return it
  52         if(likely(d))
  53                 return d;
  54
  55         if(unlikely(!path_find_block_device[0])) {
  56                 char dirname[FILENAME_MAX + 1];
  57                 snprintfz(dirname, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
  58                 snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", dirname));
  59         }
  60
  61         // not found
  62         // create a new disk structure
  63         d = (struct disk *)malloc(sizeof(struct disk));
  64         if(!d) fatal("Cannot allocate memory for struct disk in proc_diskstats.");
  65
  66         d->major = major;
  67         d->minor = minor;
  68         d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
  69         d->next = NULL;
  70
  71         // append it to the list
  72         if(!disk_root)
  73                 disk_root = d;
  74         else {
  75                 struct disk *last;
  76                 for(last = disk_root; last->next ;last = last->next);
  77                 last->next = d;
  78         }
  79
  80         // ------------------------------------------------------------------------
  81         // find the type of the device
  82
  83         // find if it is a partition
  84         // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
  85         char buffer[FILENAME_MAX + 1];
  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                 int is_container = 0;
  93                 snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
  94                 DIR *dirp = opendir(buffer);
  95                 if (dirp != NULL) {
  96                 struct dirent *dp;
  97                         while(dp = readdir(dirp)) {
  98                                 // . and .. are also files in empty folders.
  99                                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
 100                                         continue;
 101                                 }
 102                                 d->type = DISK_TYPE_CONTAINER;
 103                                 // Stop the loop after we found one file.
 104                                 break;
 105                         }
 106                         if(closedir(dirp) == -1)
 107                                 error("Unable to close dir %s", buffer);
 108                 }
 109         }
 110
 111         // ------------------------------------------------------------------------
 112         // check if we can find its mount point
 113
 114         // mountinfo_find() can be called with NULL mountinfo_root
 115         struct mountinfo *mi = mountinfo_find(mountinfo_root, d->major, d->minor);
 116         if(unlikely(!mi)) {
 117                 // mountinfo_free() can be called with NULL mountinfo_root
 118                 mountinfo_free(mountinfo_root);
 119
 120                 // re-read mountinfo in case something changed
 121                 mountinfo_root = mountinfo_read();
 122
 123                 // search again for this disk
 124                 mi = mountinfo_find(mountinfo_root, d->major, d->minor);
 125         }
 126
 127         if(mi)
 128                 d->mount_point = strdup(mi->mount_point);
 129                 // no need to check for NULL
 130         else
 131                 d->mount_point = NULL;
 132
 133         return d;
 134 }
 135
 136 int do_proc_diskstats(int update_every, unsigned long long dt) {
 137         static procfile *ff = NULL;
 138         static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 139         static int enable_autodetection;
 140         static int enable_physical_disks, enable_virtual_disks, enable_partitions, enable_mountpoints, enable_space_metrics;
 141         static int do_io, do_ops, do_mops, do_iotime, do_qops, do_util, do_backlog, do_space, do_inodes;
 142         static struct statvfs buff_statvfs;
 143         static struct stat buff_stat;
 144
 145         enable_autodetection = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", CONFIG_ONDEMAND_ONDEMAND);
 146
 147         enable_physical_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for physical disks", CONFIG_ONDEMAND_ONDEMAND);
 148         enable_virtual_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for virtual disks", CONFIG_ONDEMAND_NO);
 149         enable_partitions = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for partitions", CONFIG_ONDEMAND_NO);
 150         enable_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted filesystems", CONFIG_ONDEMAND_NO);
 151         enable_space_metrics = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space metrics for mounted filesystems", CONFIG_ONDEMAND_ONDEMAND);
 152
 153         do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", CONFIG_ONDEMAND_ONDEMAND);
 154         do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 155         do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 156         do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", CONFIG_ONDEMAND_ONDEMAND);
 157         do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 158         do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 159         do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", CONFIG_ONDEMAND_ONDEMAND);
 160         do_space   = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 161         do_inodes  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 162
 163         if(!ff) {
 164                 char filename[FILENAME_MAX + 1];
 165                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 166                 ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 167         }
 168         if(!ff) return 1;
 169
 170         if(!path_to_get_hw_sector_size[0]) {
 171                 char filename[FILENAME_MAX + 1];
 172                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 173                 snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", filename));
 174         }
 175
 176         ff = procfile_readall(ff);
 177         if(!ff) return 0; // we return 0, so that we will retry to open it next time
 178
 179         uint32_t lines = procfile_lines(ff), l;
 180         uint32_t words;
 181
 182         for(l = 0; l < lines ;l++) {
 183                 // --------------------------------------------------------------------------
 184                 // Read parameters
 185                 char *disk;
 186                 unsigned long long      major = 0, minor = 0,
 187                                                         reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 188                                                         writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 189                                                         queued_ios = 0, busy_ms = 0, backlog_ms = 0,
 190                                                         space_avail = 0, space_avail_root = 0, space_used = 0,
 191                                                         inodes_avail = 0, inodes_avail_root = 0, inodes_used = 0;
 192
 193                 unsigned long long      last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 194                                                         last_writes = 0, last_writesectors = 0, last_writems = 0,
 195                                                         last_busy_ms = 0;
 196
 197                 words = procfile_linewords(ff, l);
 198                 if(words < 14) continue;
 199
 200                 major                   = strtoull(procfile_lineword(ff, l, 0), NULL, 10);
 201                 minor                   = strtoull(procfile_lineword(ff, l, 1), NULL, 10);
 202                 disk                    = procfile_lineword(ff, l, 2);
 203
 204                 // # of reads completed # of writes completed
 205                 // This is the total number of reads or writes completed successfully.
 206                 reads                   = strtoull(procfile_lineword(ff, l, 3), NULL, 10);      // rd_ios
 207                 writes                  = strtoull(procfile_lineword(ff, l, 7), NULL, 10);      // wr_ios
 208
 209                 // # of reads merged # of writes merged
 210                 // Reads and writes which are adjacent to each other may be merged for
 211             // efficiency.  Thus two 4K reads may become one 8K read before it is
 212             // ultimately handed to the disk, and so it will be counted (and queued)
 213                 mreads                  = strtoull(procfile_lineword(ff, l, 4), NULL, 10);      // rd_merges_or_rd_sec
 214                 mwrites                 = strtoull(procfile_lineword(ff, l, 8), NULL, 10);      // wr_merges
 215
 216                 // # of sectors read # of sectors written
 217                 // This is the total number of sectors read or written successfully.
 218                 readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);      // rd_sec_or_wr_ios
 219                 writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);      // wr_sec
 220
 221                 // # of milliseconds spent reading # of milliseconds spent writing
 222                 // This is the total number of milliseconds spent by all reads or writes (as
 223                 // measured from __make_request() to end_that_request_last()).
 224                 readms                  = strtoull(procfile_lineword(ff, l, 6), NULL, 10);      // rd_ticks_or_wr_sec
 225                 writems                 = strtoull(procfile_lineword(ff, l, 10), NULL, 10);     // wr_ticks
 226
 227                 // # of I/Os currently in progress
 228                 // The only field that should go to zero. Incremented as requests are
 229                 // given to appropriate struct request_queue and decremented as they finish.
 230                 queued_ios              = strtoull(procfile_lineword(ff, l, 11), NULL, 10);     // ios_pgr
 231
 232                 // # of milliseconds spent doing I/Os
 233                 // This field increases so long as field queued_ios is nonzero.
 234                 busy_ms                 = strtoull(procfile_lineword(ff, l, 12), NULL, 10);     // tot_ticks
 235
 236                 // weighted # of milliseconds spent doing I/Os
 237                 // This field is incremented at each I/O start, I/O completion, I/O
 238                 // merge, or read of these stats by the number of I/Os in progress
 239                 // (field queued_ios) times the number of milliseconds spent doing I/O since the
 240                 // last update of this field.  This can provide an easy measure of both
 241                 // I/O completion time and the backlog that may be accumulating.
 242                 backlog_ms              = strtoull(procfile_lineword(ff, l, 13), NULL, 10);     // rq_ticks
 243
 244                 // --------------------------------------------------------------------------
 245                 // remove slashes from disk names
 246                 char *s;
 247                 for(s = disk; *s ;s++) if(*s == '/') *s = '_';
 248                 struct disk *d = get_disk(major, minor);
 249                 // Find mount point and family
 250                 char *mount_point = d->mount_point;
 251                 char *family = d->mount_point;
 252                 if(!family) family = disk;
 253
 254                 // --------------------------------------------------------------------------
 255                 // Check if device is enabled by autodetection or config
 256                 int def_enable = -1;
 257                 char var_name[4096 + 1];
 258                 snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 259
 260                 if(def_enable == -1) def_enable = config_get_boolean_ondemand(var_name, "enable", CONFIG_ONDEMAND_ONDEMAND);
 261                 if(def_enable == CONFIG_ONDEMAND_NO) continue;
 262
 263                 int def_performance = CONFIG_ONDEMAND_NO, def_space = CONFIG_ONDEMAND_NO;
 264                 if(enable_autodetection)  {
 265                         if(enable_physical_disks && (d->type == DISK_TYPE_PHYSICAL)) {
 266                                 def_performance = enable_physical_disks;
 267                         } else if(enable_virtual_disks && (d->type == DISK_TYPE_CONTAINER)) {
 268                                 def_performance = enable_virtual_disks;
 269                         } else if(enable_partitions && (d->type == DISK_TYPE_PARTITION)) {
 270                                 def_performance = enable_partitions;
 271                         } else if(enable_mountpoints && (d->mount_point != NULL)) {
 272                                 def_performance = enable_mountpoints;
 273                         }
 274
 275                         if(enable_space_metrics && (d->mount_point != NULL)) {
 276                                 def_space = enable_space_metrics;
 277                         }
 278                 }
 279
 280                 RRDSET *st;
 281
 282                 // --------------------------------------------------------------------------
 283                 // Do performance metrics
 284                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 285                 if( (def_performance == CONFIG_ONDEMAND_YES) || (def_performance == CONFIG_ONDEMAND_ONDEMAND && reads && writes) ) {
 286                         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;
 287
 288                         ddo_io          = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 289                         ddo_ops         = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 290                         ddo_mops        = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 291                         ddo_iotime      = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 292                         ddo_qops        = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 293                         ddo_util        = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 294                         ddo_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 295
 296                         // by default, do not add charts that do not have values
 297                         if(ddo_io == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) ddo_io = 0;
 298                         if(ddo_mops == CONFIG_ONDEMAND_ONDEMAND && mreads == 0 && mwrites == 0) ddo_mops = 0;
 299                         if(ddo_iotime == CONFIG_ONDEMAND_ONDEMAND && readms == 0 && writems == 0) ddo_iotime = 0;
 300                         if(ddo_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms == 0) ddo_util = 0;
 301                         if(ddo_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_backlog = 0;
 302                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_qops = 0;
 303
 304                         // for absolute values, we need to switch the setting to 'yes'
 305                         // to allow it refresh from now on
 306                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND) config_set(var_name, "queued operations", "yes");
 307
 308                         // --------------------------------------------------------------------
 309                         int sector_size = 512;
 310                         if(ddo_io) {
 311                                 st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 312                                 if(!st) {
 313                                         char tf[FILENAME_MAX + 1], *t;
 314                                         char ssfilename[FILENAME_MAX + 1];
 315
 316                                         strncpyz(tf, disk, FILENAME_MAX);
 317
 318                                         // replace all / with !
 319                                         while((t = strchr(tf, '/'))) *t = '!';
 320
 321                                         snprintfz(ssfilename, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 322                                         FILE *fpss = fopen(ssfilename, "r");
 323                                         if(fpss) {
 324                                                 char ssbuffer[1025];
 325                                                 char *tmp = fgets(ssbuffer, 1024, fpss);
 326
 327                                                 if(tmp) {
 328                                                         sector_size = atoi(tmp);
 329                                                         if(sector_size <= 0) {
 330                                                                 error("Invalid sector size %d for device %s in %s. Assuming 512.", sector_size, disk, ssfilename);
 331                                                                 sector_size = 512;
 332                                                         }
 333                                                 }
 334                                                 else error("Cannot read data for sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 335
 336                                                 fclose(fpss);
 337                                         }
 338                                         else error("Cannot read sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 339
 340                                         st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 341
 342                                         rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_INCREMENTAL);
 343                                         rrddim_add(st, "writes", NULL, sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 344                                 }
 345                                 else rrdset_next_usec(st, dt);
 346
 347                                 last_readsectors  = rrddim_set(st, "reads", readsectors);
 348                                 last_writesectors = rrddim_set(st, "writes", writesectors);
 349                                 rrdset_done(st);
 350                         }
 351
 352                         // --------------------------------------------------------------------
 353                         if(ddo_ops) {
 354                                 st = rrdset_find_bytype("disk_ops", disk);
 355                                 if(!st) {
 356                                         st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 357                                         st->isdetail = 1;
 358
 359                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 360                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 361                                 }
 362                                 else rrdset_next_usec(st, dt);
 363
 364                                 last_reads  = rrddim_set(st, "reads", reads);
 365                                 last_writes = rrddim_set(st, "writes", writes);
 366                                 rrdset_done(st);
 367                         }
 368
 369                         // --------------------------------------------------------------------
 370                         if(ddo_qops) {
 371                                 st = rrdset_find_bytype("disk_qops", disk);
 372                                 if(!st) {
 373                                         st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 374                                         st->isdetail = 1;
 375
 376                                         rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 377                                 }
 378                                 else rrdset_next_usec(st, dt);
 379
 380                                 rrddim_set(st, "operations", queued_ios);
 381                                 rrdset_done(st);
 382                         }
 383
 384                         // --------------------------------------------------------------------
 385                         if(ddo_backlog) {
 386                                 st = rrdset_find_bytype("disk_backlog", disk);
 387                                 if(!st) {
 388                                         st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 389                                         st->isdetail = 1;
 390
 391                                         rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 392                                 }
 393                                 else rrdset_next_usec(st, dt);
 394
 395                                 rrddim_set(st, "backlog", backlog_ms);
 396                                 rrdset_done(st);
 397                         }
 398
 399                         // --------------------------------------------------------------------
 400                         if(ddo_util) {
 401                                 st = rrdset_find_bytype("disk_util", disk);
 402                                 if(!st) {
 403                                         st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 404                                         st->isdetail = 1;
 405
 406                                         rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 407                                 }
 408                                 else rrdset_next_usec(st, dt);
 409
 410                                 last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 411                                 rrdset_done(st);
 412                         }
 413
 414                         // --------------------------------------------------------------------
 415                         if(ddo_mops) {
 416                                 st = rrdset_find_bytype("disk_mops", disk);
 417                                 if(!st) {
 418                                         st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 419                                         st->isdetail = 1;
 420
 421                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 422                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 423                                 }
 424                                 else rrdset_next_usec(st, dt);
 425
 426                                 rrddim_set(st, "reads", mreads);
 427                                 rrddim_set(st, "writes", mwrites);
 428                                 rrdset_done(st);
 429                         }
 430
 431                         // --------------------------------------------------------------------
 432                         if(ddo_iotime) {
 433                                 st = rrdset_find_bytype("disk_iotime", disk);
 434                                 if(!st) {
 435                                         st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 436                                         st->isdetail = 1;
 437
 438                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 439                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 440                                 }
 441                                 else rrdset_next_usec(st, dt);
 442
 443                                 last_readms  = rrddim_set(st, "reads", readms);
 444                                 last_writems = rrddim_set(st, "writes", writems);
 445                                 rrdset_done(st);
 446                         }
 447
 448                         // --------------------------------------------------------------------
 449                         // calculate differential charts
 450                         // only if this is not the first time we run
 451                         if(dt) {
 452                                 if(ddo_iotime && ddo_ops) {
 453                                         st = rrdset_find_bytype("disk_await", disk);
 454                                         if(!st) {
 455                                                 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);
 456                                                 st->isdetail = 1;
 457
 458                                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 459                                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 460                                         }
 461                                         else rrdset_next_usec(st, dt);
 462
 463                                         rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 464                                         rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 465                                         rrdset_done(st);
 466                                 }
 467
 468                                 if(ddo_io && ddo_ops) {
 469                                         st = rrdset_find_bytype("disk_avgsz", disk);
 470                                         if(!st) {
 471                                                 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);
 472                                                 st->isdetail = 1;
 473
 474                                                 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_ABSOLUTE);
 475                                                 rrddim_add(st, "writes", NULL, -sector_size, 1024, RRDDIM_ABSOLUTE);
 476                                         }
 477                                         else rrdset_next_usec(st, dt);
 478
 479                                         rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 480                                         rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 481                                         rrdset_done(st);
 482                                 }
 483
 484                                 if(ddo_util && ddo_ops) {
 485                                         st = rrdset_find_bytype("disk_svctm", disk);
 486                                         if(!st) {
 487                                                 st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 488                                                 st->isdetail = 1;
 489
 490                                                 rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 491                                         }
 492                                         else rrdset_next_usec(st, dt);
 493
 494                                         rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 495                                         rrdset_done(st);
 496                                 }
 497                         }
 498                 }
 499
 500                 // --------------------------------------------------------------------------
 501                 // Do space metrics
 502                 def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 503                 if(def_space != CONFIG_ONDEMAND_NO) {
 504                         int ddo_space = do_space, ddo_inodes = do_inodes;
 505
 506                         ddo_space = config_get_boolean_ondemand(var_name, "space", ddo_space);
 507                         ddo_inodes = config_get_boolean_ondemand(var_name, "inodes", ddo_space);
 508                         if(mount_point && (ddo_space || ddo_inodes) ) {
 509                                 // collect space metrics using statvfs
 510                                 if (statvfs(mount_point, &buff_statvfs) < 0) {
 511                                         error("Failed checking disk space usage of %s", family);
 512                                 } else {
 513                                         // verify we collected the metrics for the right disk.
 514                                         // if not the mountpoint has changed.
 515                                         if(stat(mount_point, &buff_stat) == -1) {
 516                                                 error("Failed to call stat for %s", family);
 517                                         } else {
 518                                                 if(major(buff_stat.st_dev) == major && minor(buff_stat.st_dev) == minor)
 519                                                 {
 520                                                         if(ddo_space) {
 521                                                                 space_avail = buff_statvfs.f_bavail * buff_statvfs.f_bsize;
 522                                                                 space_avail_root = (buff_statvfs.f_bfree - buff_statvfs.f_bavail) * buff_statvfs.f_bsize;
 523                                                                 space_used = (buff_statvfs.f_blocks - buff_statvfs.f_bfree) * buff_statvfs.f_bsize;
 524
 525                                                                 st = rrdset_find_bytype("disk_space", disk);
 526                                                                 if(!st) {
 527                                                                         st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 528                                                                         st->isdetail = 1;
 529
 530                                                                         rrddim_add(st, "avail", NULL, 1, 1000*1000*1000, RRDDIM_ABSOLUTE);
 531                                                                         rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1000*1000*1000, RRDDIM_ABSOLUTE);
 532                                                                         rrddim_add(st, "used" , NULL, 1, 1000*1000*1000, RRDDIM_ABSOLUTE);
 533                                                                 }
 534                                                                 else rrdset_next_usec(st, dt);
 535
 536                                                                 rrddim_set(st, "avail", space_avail);
 537                                                                 rrddim_set(st, "reserved_for_root", space_avail_root);
 538                                                                 rrddim_set(st, "used", space_used);
 539                                                                 rrdset_done(st);
 540                                                         }
 541                                                         if(ddo_inodes) {
 542                                                                 inodes_avail = buff_statvfs.f_favail;
 543                                                                 inodes_avail_root = buff_statvfs.f_ffree - buff_statvfs.f_favail;
 544                                                                 inodes_used = buff_statvfs.f_files - buff_statvfs.f_ffree;
 545
 546                                                                 st = rrdset_find_bytype("disk_inodes", disk);
 547                                                                 if(!st) {
 548                                                                         st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", "Disk Inodes Usage", "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 549                                                                         st->isdetail = 1;
 550
 551                                                                         rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 552                                                                         rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 553                                                                         rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 554                                                                 }
 555                                                                 else rrdset_next_usec(st, dt);
 556
 557                                                                 rrddim_set(st, "avail", inodes_avail);
 558                                                                 rrddim_set(st, "reserved_for_root", inodes_avail_root);
 559                                                                 rrddim_set(st, "used", inodes_used);
 560                                                                 rrdset_done(st);
 561                                                         }
 562                                                 }
 563                                         }
 564                                 }
 565                         }
 566                 }
 567         }
 568         return 0;
 569 }