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 static struct disk {
  31         char *disk;                             // the name of the disk (sda, sdb, etc)
  32         unsigned long major;
  33         unsigned long minor;
  34         int sector_size;
  35         int type;
  36         char *mount_point;
  37
  38         // disk options caching
  39         int configured;
  40         int do_io;
  41         int do_ops;
  42         int do_mops;
  43         int do_iotime;
  44         int do_qops;
  45         int do_util;
  46         int do_backlog;
  47         int do_space;
  48         int do_inodes;
  49
  50         struct disk *next;
  51 } *disk_root = NULL;
  52
  53 static struct mountinfo *disk_mountinfo_root = NULL;
  54
  55 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
  56         static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
  57         static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
  58         static char path_find_block_device[FILENAME_MAX + 1] = "";
  59         struct disk *d;
  60
  61         // search for it in our RAM list.
  62         // this is sequential, but since we just walk through
  63         // and the number of disks / partitions in a system
  64         // should not be that many, it should be acceptable
  65         for(d = disk_root; d ; d = d->next)
  66                 if(unlikely(d->major == major && d->minor == minor))
  67                         break;
  68
  69         // if we found it, return it
  70         if(likely(d))
  71                 return d;
  72
  73         // not found
  74         // create a new disk structure
  75         d = (struct disk *)malloc(sizeof(struct disk));
  76         if(!d) fatal("Cannot allocate memory for struct disk in proc_diskstats.");
  77
  78         d->disk = strdup(disk);
  79         d->major = major;
  80         d->minor = minor;
  81         d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
  82         d->configured = 0;
  83         d->sector_size = 512; // the default, will be changed below
  84         d->next = NULL;
  85
  86         // append it to the list
  87         if(!disk_root)
  88                 disk_root = d;
  89         else {
  90                 struct disk *last;
  91                 for(last = disk_root; last->next ;last = last->next);
  92                 last->next = d;
  93         }
  94
  95         // ------------------------------------------------------------------------
  96         // find the type of the device
  97
  98         char buffer[FILENAME_MAX + 1];
  99
 100         // get the default path for finding info about the block device
 101         if(unlikely(!path_find_block_device[0])) {
 102                 snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
 103                 snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", buffer));
 104         }
 105
 106         // find if it is a partition
 107         // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
 108         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
 109         if(access(buffer, R_OK) == 0) {
 110                 d->type = DISK_TYPE_PARTITION;
 111         } else {
 112                 // find if it is a container
 113                 // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
 114                 snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
 115                 DIR *dirp = opendir(buffer);
 116                 if (dirp != NULL) {
 117                         struct dirent *dp;
 118                         while( (dp = readdir(dirp)) ) {
 119                                 // . and .. are also files in empty folders.
 120                                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
 121                                         continue;
 122                                 }
 123
 124                                 d->type = DISK_TYPE_CONTAINER;
 125
 126                                 // Stop the loop after we found one file.
 127                                 break;
 128                         }
 129                         if(closedir(dirp) == -1)
 130                                 error("Unable to close dir %s", buffer);
 131                 }
 132         }
 133
 134         // ------------------------------------------------------------------------
 135         // check if we can find its mount point
 136
 137         // mountinfo_find() can be called with NULL disk_mountinfo_root
 138         struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 139         if(unlikely(!mi)) {
 140                 // mountinfo_free() can be called with NULL disk_mountinfo_root
 141                 mountinfo_free(disk_mountinfo_root);
 142
 143                 // re-read mountinfo in case something changed
 144                 disk_mountinfo_root = mountinfo_read();
 145
 146                 // search again for this disk
 147                 mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 148         }
 149
 150         if(mi)
 151                 d->mount_point = strdup(mi->mount_point);
 152                 // no need to check for NULL
 153         else
 154                 d->mount_point = NULL;
 155
 156         // ------------------------------------------------------------------------
 157         // find the disk sector size
 158
 159         if(!path_to_get_hw_sector_size[0]) {
 160                 snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 161                 snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", buffer));
 162         }
 163         if(!path_to_get_hw_sector_size_partitions[0]) {
 164                 snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 165                 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));
 166         }
 167
 168         {
 169                 char tf[FILENAME_MAX + 1], *t;
 170                 strncpyz(tf, d->disk, FILENAME_MAX);
 171
 172                 // replace all / with !
 173                 for(t = tf; *t ;t++)
 174                         if(*t == '/') *t = '!';
 175
 176                 if(d->type == DISK_TYPE_PARTITION)
 177                         snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 178                 else
 179                         snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 180
 181                 FILE *fpss = fopen(buffer, "r");
 182                 if(fpss) {
 183                         char buffer2[1024 + 1];
 184                         char *tmp = fgets(buffer2, 1024, fpss);
 185
 186                         if(tmp) {
 187                                 d->sector_size = atoi(tmp);
 188                                 if(d->sector_size <= 0) {
 189                                         error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 190                                         d->sector_size = 512;
 191                                 }
 192                         }
 193                         else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 194
 195                         fclose(fpss);
 196                 }
 197                 else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 198         }
 199
 200         return d;
 201 }
 202
 203 static inline int select_positive_option(int option1, int option2) {
 204         if(option1 == CONFIG_ONDEMAND_YES || option2 == CONFIG_ONDEMAND_YES)
 205                 return CONFIG_ONDEMAND_YES;
 206         else if(option1 == CONFIG_ONDEMAND_ONDEMAND || option2 == CONFIG_ONDEMAND_ONDEMAND)
 207                 return CONFIG_ONDEMAND_ONDEMAND;
 208
 209         return CONFIG_ONDEMAND_NO;
 210 }
 211
 212 int do_proc_diskstats(int update_every, unsigned long long dt) {
 213         static procfile *ff = NULL;
 214         static struct statvfs buff_statvfs;
 215         static struct stat buff_stat;
 216         static int      global_enable_new_disks_detected_at_runtime = CONFIG_ONDEMAND_YES,
 217                                 global_enable_performance_for_physical_disks = CONFIG_ONDEMAND_ONDEMAND,
 218                                 global_enable_performance_for_virtual_disks = CONFIG_ONDEMAND_NO,
 219                                 global_enable_performance_for_partitions = CONFIG_ONDEMAND_NO,
 220                                 global_enable_performance_for_mountpoints = CONFIG_ONDEMAND_NO,
 221                                 global_enable_performance_for_virtual_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 222                                 global_enable_space_for_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 223                                 global_do_io = CONFIG_ONDEMAND_ONDEMAND,
 224                                 global_do_ops = CONFIG_ONDEMAND_ONDEMAND,
 225                                 global_do_mops = CONFIG_ONDEMAND_ONDEMAND,
 226                                 global_do_iotime = CONFIG_ONDEMAND_ONDEMAND,
 227                                 global_do_qops = CONFIG_ONDEMAND_ONDEMAND,
 228                                 global_do_util = CONFIG_ONDEMAND_ONDEMAND,
 229                                 global_do_backlog = CONFIG_ONDEMAND_ONDEMAND,
 230                                 global_do_space = CONFIG_ONDEMAND_ONDEMAND,
 231                                 global_do_inodes = CONFIG_ONDEMAND_ONDEMAND,
 232                                 globals_initialized = 0;
 233
 234         if(unlikely(!globals_initialized)) {
 235                 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);
 236
 237                 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);
 238                 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);
 239                 global_enable_performance_for_partitions = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for partitions", global_enable_performance_for_partitions);
 240                 global_enable_performance_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted filesystems", global_enable_performance_for_mountpoints);
 241                 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);
 242                 global_enable_space_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space metrics for mounted filesystems", global_enable_space_for_mountpoints);
 243
 244                 global_do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", global_do_io);
 245                 global_do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", global_do_ops);
 246                 global_do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", global_do_mops);
 247                 global_do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", global_do_iotime);
 248                 global_do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", global_do_qops);
 249                 global_do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", global_do_util);
 250                 global_do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", global_do_backlog);
 251                 global_do_space   = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", global_do_space);
 252                 global_do_inodes  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", global_do_inodes);
 253
 254                 globals_initialized = 1;
 255         }
 256
 257         if(!ff) {
 258                 char filename[FILENAME_MAX + 1];
 259                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 260                 ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 261         }
 262         if(!ff) return 1;
 263
 264         ff = procfile_readall(ff);
 265         if(!ff) return 0; // we return 0, so that we will retry to open it next time
 266
 267         uint32_t lines = procfile_lines(ff), l;
 268         uint32_t words;
 269
 270         for(l = 0; l < lines ;l++) {
 271                 // --------------------------------------------------------------------------
 272                 // Read parameters
 273
 274                 char *disk;
 275                 unsigned long long      major = 0, minor = 0,
 276                                                         reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 277                                                         writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 278                                                         queued_ios = 0, busy_ms = 0, backlog_ms = 0,
 279                                                         space_avail = 0, space_avail_root = 0, space_used = 0,
 280                                                         inodes_avail = 0, inodes_avail_root = 0, inodes_used = 0;
 281
 282                 unsigned long long      last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 283                                                         last_writes = 0, last_writesectors = 0, last_writems = 0,
 284                                                         last_busy_ms = 0;
 285
 286                 words = procfile_linewords(ff, l);
 287                 if(words < 14) continue;
 288
 289                 major                   = strtoull(procfile_lineword(ff, l, 0), NULL, 10);
 290                 minor                   = strtoull(procfile_lineword(ff, l, 1), NULL, 10);
 291                 disk                    = procfile_lineword(ff, l, 2);
 292
 293                 // # of reads completed # of writes completed
 294                 // This is the total number of reads or writes completed successfully.
 295                 reads                   = strtoull(procfile_lineword(ff, l, 3), NULL, 10);      // rd_ios
 296                 writes                  = strtoull(procfile_lineword(ff, l, 7), NULL, 10);      // wr_ios
 297
 298                 // # of reads merged # of writes merged
 299                 // Reads and writes which are adjacent to each other may be merged for
 300             // efficiency.  Thus two 4K reads may become one 8K read before it is
 301             // ultimately handed to the disk, and so it will be counted (and queued)
 302                 mreads                  = strtoull(procfile_lineword(ff, l, 4), NULL, 10);      // rd_merges_or_rd_sec
 303                 mwrites                 = strtoull(procfile_lineword(ff, l, 8), NULL, 10);      // wr_merges
 304
 305                 // # of sectors read # of sectors written
 306                 // This is the total number of sectors read or written successfully.
 307                 readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);      // rd_sec_or_wr_ios
 308                 writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);      // wr_sec
 309
 310                 // # of milliseconds spent reading # of milliseconds spent writing
 311                 // This is the total number of milliseconds spent by all reads or writes (as
 312                 // measured from __make_request() to end_that_request_last()).
 313                 readms                  = strtoull(procfile_lineword(ff, l, 6), NULL, 10);      // rd_ticks_or_wr_sec
 314                 writems                 = strtoull(procfile_lineword(ff, l, 10), NULL, 10);     // wr_ticks
 315
 316                 // # of I/Os currently in progress
 317                 // The only field that should go to zero. Incremented as requests are
 318                 // given to appropriate struct request_queue and decremented as they finish.
 319                 queued_ios              = strtoull(procfile_lineword(ff, l, 11), NULL, 10);     // ios_pgr
 320
 321                 // # of milliseconds spent doing I/Os
 322                 // This field increases so long as field queued_ios is nonzero.
 323                 busy_ms                 = strtoull(procfile_lineword(ff, l, 12), NULL, 10);     // tot_ticks
 324
 325                 // weighted # of milliseconds spent doing I/Os
 326                 // This field is incremented at each I/O start, I/O completion, I/O
 327                 // merge, or read of these stats by the number of I/Os in progress
 328                 // (field queued_ios) times the number of milliseconds spent doing I/O since the
 329                 // last update of this field.  This can provide an easy measure of both
 330                 // I/O completion time and the backlog that may be accumulating.
 331                 backlog_ms              = strtoull(procfile_lineword(ff, l, 13), NULL, 10);     // rq_ticks
 332
 333
 334                 // --------------------------------------------------------------------------
 335                 // remove slashes from disk names
 336                 char *s;
 337                 for(s = disk; *s ;s++)
 338                         if(*s == '/') *s = '_';
 339
 340                 // --------------------------------------------------------------------------
 341                 // get a disk structure for the disk
 342
 343                 struct disk *d = get_disk(major, minor, disk);
 344
 345
 346                 // --------------------------------------------------------------------------
 347                 // Set its family based on mount point
 348
 349                 char *family = d->mount_point;
 350                 if(!family) family = disk;
 351
 352
 353                 // --------------------------------------------------------------------------
 354                 // Check the configuration for the device
 355
 356                 if(unlikely(!d->configured)) {
 357                         char var_name[4096 + 1];
 358                         snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 359
 360                         int def_enable = config_get_boolean_ondemand(var_name, "enable", global_enable_new_disks_detected_at_runtime);
 361                         if(def_enable == CONFIG_ONDEMAND_NO) {
 362                                 // the user does not want any metrics for this disk
 363                                 d->do_io = CONFIG_ONDEMAND_NO;
 364                                 d->do_ops = CONFIG_ONDEMAND_NO;
 365                                 d->do_mops = CONFIG_ONDEMAND_NO;
 366                                 d->do_iotime = CONFIG_ONDEMAND_NO;
 367                                 d->do_qops = CONFIG_ONDEMAND_NO;
 368                                 d->do_util = CONFIG_ONDEMAND_NO;
 369                                 d->do_backlog = CONFIG_ONDEMAND_NO;
 370                                 d->do_space = CONFIG_ONDEMAND_NO;
 371                                 d->do_inodes = CONFIG_ONDEMAND_NO;
 372                         }
 373                         else {
 374                                 // this disk is enabled
 375                                 // check its direct settings
 376
 377                                 int def_performance = CONFIG_ONDEMAND_ONDEMAND;
 378                                 int def_space = (d->mount_point)?CONFIG_ONDEMAND_ONDEMAND:CONFIG_ONDEMAND_NO;
 379
 380                                 // since this is 'on demand' we can figure the performance settings
 381                                 // based on the type of disk
 382
 383                                 switch(d->type) {
 384                                         case DISK_TYPE_PHYSICAL:
 385                                                 def_performance = global_enable_performance_for_physical_disks;
 386                                                 break;
 387
 388                                         case DISK_TYPE_PARTITION:
 389                                                 def_performance = global_enable_performance_for_partitions;
 390                                                 break;
 391
 392                                         case DISK_TYPE_CONTAINER:
 393                                                 def_performance = global_enable_performance_for_virtual_disks;
 394
 395                                                 if(d->mount_point)
 396                                                         def_performance = select_positive_option(def_performance, global_enable_performance_for_virtual_mountpoints);
 397
 398                                                 break;
 399                                 }
 400
 401                                 if(d->mount_point)
 402                                         def_performance = select_positive_option(def_performance, global_enable_performance_for_mountpoints);
 403
 404                                 // ------------------------------------------------------------
 405                                 // now we have def_performance and def_space
 406                                 // to work further
 407
 408                                 // def_performance
 409                                 // check the user configuration (this will also show our 'on demand' decision)
 410                                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 411
 412                                 int ddo_io = CONFIG_ONDEMAND_NO,
 413                                         ddo_ops = CONFIG_ONDEMAND_NO,
 414                                         ddo_mops = CONFIG_ONDEMAND_NO,
 415                                         ddo_iotime = CONFIG_ONDEMAND_NO,
 416                                         ddo_qops = CONFIG_ONDEMAND_NO,
 417                                         ddo_util = CONFIG_ONDEMAND_NO,
 418                                         ddo_backlog = CONFIG_ONDEMAND_NO;
 419
 420                                 // we enable individual performance charts only when def_performance is not disabled
 421                                 if(def_performance != CONFIG_ONDEMAND_NO) {
 422                                         ddo_io = global_do_io,
 423                                         ddo_ops = global_do_ops,
 424                                         ddo_mops = global_do_mops,
 425                                         ddo_iotime = global_do_iotime,
 426                                         ddo_qops = global_do_qops,
 427                                         ddo_util = global_do_util,
 428                                         ddo_backlog = global_do_backlog;
 429                                 }
 430
 431                                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 432                                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 433                                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 434                                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 435                                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 436                                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 437                                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 438
 439                                 // def_space
 440                                 if(d->mount_point) {
 441                                         // check the user configuration (this will also show our 'on demand' decision)
 442                                         def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 443
 444                                         int ddo_space = def_space,
 445                                                 ddo_inodes = def_space;
 446
 447                                         d->do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 448                                         d->do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 449                                 }
 450                                 else {
 451                                         // don't show settings for this disk
 452                                         d->do_space = CONFIG_ONDEMAND_NO;
 453                                         d->do_inodes = CONFIG_ONDEMAND_NO;
 454                                 }
 455                         }
 456
 457                         d->configured = 1;
 458                 }
 459
 460                 RRDSET *st;
 461
 462                 // --------------------------------------------------------------------------
 463                 // Do performance metrics
 464
 465                 if(d->do_io == CONFIG_ONDEMAND_YES || (d->do_io == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) {
 466                         d->do_io = CONFIG_ONDEMAND_YES;
 467
 468                         st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 469                         if(!st) {
 470                                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 471
 472                                 rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_INCREMENTAL);
 473                                 rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 474                         }
 475                         else rrdset_next_usec(st, dt);
 476
 477                         last_readsectors  = rrddim_set(st, "reads", readsectors);
 478                         last_writesectors = rrddim_set(st, "writes", writesectors);
 479                         rrdset_done(st);
 480                 }
 481
 482                 // --------------------------------------------------------------------
 483
 484                 if(d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes))) {
 485                         d->do_ops = CONFIG_ONDEMAND_YES;
 486
 487                         st = rrdset_find_bytype("disk_ops", disk);
 488                         if(!st) {
 489                                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 490                                 st->isdetail = 1;
 491
 492                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 493                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 494                         }
 495                         else rrdset_next_usec(st, dt);
 496
 497                         last_reads  = rrddim_set(st, "reads", reads);
 498                         last_writes = rrddim_set(st, "writes", writes);
 499                         rrdset_done(st);
 500                 }
 501
 502                 // --------------------------------------------------------------------
 503
 504                 if(d->do_qops == CONFIG_ONDEMAND_YES || (d->do_qops == CONFIG_ONDEMAND_ONDEMAND && queued_ios)) {
 505                         d->do_qops = CONFIG_ONDEMAND_YES;
 506
 507                         st = rrdset_find_bytype("disk_qops", disk);
 508                         if(!st) {
 509                                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 510                                 st->isdetail = 1;
 511
 512                                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 513                         }
 514                         else rrdset_next_usec(st, dt);
 515
 516                         rrddim_set(st, "operations", queued_ios);
 517                         rrdset_done(st);
 518                 }
 519
 520                 // --------------------------------------------------------------------
 521
 522                 if(d->do_backlog == CONFIG_ONDEMAND_YES || (d->do_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms)) {
 523                         d->do_backlog = CONFIG_ONDEMAND_YES;
 524
 525                         st = rrdset_find_bytype("disk_backlog", disk);
 526                         if(!st) {
 527                                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 528                                 st->isdetail = 1;
 529
 530                                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 531                         }
 532                         else rrdset_next_usec(st, dt);
 533
 534                         rrddim_set(st, "backlog", backlog_ms);
 535                         rrdset_done(st);
 536                 }
 537
 538                 // --------------------------------------------------------------------
 539
 540                 if(d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) {
 541                         d->do_util = CONFIG_ONDEMAND_YES;
 542
 543                         st = rrdset_find_bytype("disk_util", disk);
 544                         if(!st) {
 545                                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 546                                 st->isdetail = 1;
 547
 548                                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 549                         }
 550                         else rrdset_next_usec(st, dt);
 551
 552                         last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 553                         rrdset_done(st);
 554                 }
 555
 556                 // --------------------------------------------------------------------
 557
 558                 if(d->do_mops == CONFIG_ONDEMAND_YES || (d->do_mops == CONFIG_ONDEMAND_ONDEMAND && (mreads || mwrites))) {
 559                         d->do_mops = CONFIG_ONDEMAND_YES;
 560
 561                         st = rrdset_find_bytype("disk_mops", disk);
 562                         if(!st) {
 563                                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 564                                 st->isdetail = 1;
 565
 566                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 567                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 568                         }
 569                         else rrdset_next_usec(st, dt);
 570
 571                         rrddim_set(st, "reads", mreads);
 572                         rrddim_set(st, "writes", mwrites);
 573                         rrdset_done(st);
 574                 }
 575
 576                 // --------------------------------------------------------------------
 577
 578                 if(d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) {
 579                         d->do_iotime = CONFIG_ONDEMAND_YES;
 580
 581                         st = rrdset_find_bytype("disk_iotime", disk);
 582                         if(!st) {
 583                                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 584                                 st->isdetail = 1;
 585
 586                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 587                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 588                         }
 589                         else rrdset_next_usec(st, dt);
 590
 591                         last_readms  = rrddim_set(st, "reads", readms);
 592                         last_writems = rrddim_set(st, "writes", writems);
 593                         rrdset_done(st);
 594                 }
 595
 596                 // --------------------------------------------------------------------
 597                 // calculate differential charts
 598                 // only if this is not the first time we run
 599
 600                 if(dt) {
 601                         if( (d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) &&
 602                                 (d->do_ops    == CONFIG_ONDEMAND_YES || (d->do_ops    == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 603                                 st = rrdset_find_bytype("disk_await", disk);
 604                                 if(!st) {
 605                                         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);
 606                                         st->isdetail = 1;
 607
 608                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 609                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 610                                 }
 611                                 else rrdset_next_usec(st, dt);
 612
 613                                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 614                                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 615                                 rrdset_done(st);
 616                         }
 617
 618                         if( (d->do_io  == CONFIG_ONDEMAND_YES || (d->do_io  == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) &&
 619                                 (d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 620                                 st = rrdset_find_bytype("disk_avgsz", disk);
 621                                 if(!st) {
 622                                         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);
 623                                         st->isdetail = 1;
 624
 625                                         rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_ABSOLUTE);
 626                                         rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_ABSOLUTE);
 627                                 }
 628                                 else rrdset_next_usec(st, dt);
 629
 630                                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 631                                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 632                                 rrdset_done(st);
 633                         }
 634
 635                         if( (d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) &&
 636                                 (d->do_ops  == CONFIG_ONDEMAND_YES || (d->do_ops  == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 637                                 st = rrdset_find_bytype("disk_svctm", disk);
 638                                 if(!st) {
 639                                         st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 640                                         st->isdetail = 1;
 641
 642                                         rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 643                                 }
 644                                 else rrdset_next_usec(st, dt);
 645
 646                                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 647                                 rrdset_done(st);
 648                         }
 649                 }
 650
 651                 // --------------------------------------------------------------------------
 652                 // space metrics
 653
 654                 if(d->mount_point && (d->do_space || d->do_inodes) ) {
 655                         // collect space metrics using statvfs
 656
 657                         if (statvfs(d->mount_point, &buff_statvfs) < 0)
 658                                 error("Failed statvfs() for '%s' (disk '%s')", d->mount_point, d->disk);
 659                         else {
 660                                 space_avail = buff_statvfs.f_bavail * buff_statvfs.f_bsize;
 661                                 space_avail_root = (buff_statvfs.f_bfree - buff_statvfs.f_bavail) * buff_statvfs.f_bsize;
 662                                 space_used = (buff_statvfs.f_blocks - buff_statvfs.f_bfree) * buff_statvfs.f_bsize;
 663
 664                                 inodes_avail = buff_statvfs.f_favail;
 665                                 inodes_avail_root = buff_statvfs.f_ffree - buff_statvfs.f_favail;
 666                                 inodes_used = buff_statvfs.f_files - buff_statvfs.f_ffree;
 667
 668                                 // verify we collected the metrics for the right disk.
 669                                 // if not the mountpoint has changed.
 670
 671                                 if(stat(d->mount_point, &buff_stat) == -1)
 672                                         error("Failed to stat() for '%s' (disk '%s')", d->mount_point, d->disk);
 673                                 else {
 674                                         if(major(buff_stat.st_dev) == major && minor(buff_stat.st_dev) == minor) {
 675
 676                                                 // --------------------------------------------------------------------------
 677
 678                                                 if(d->do_space == CONFIG_ONDEMAND_YES || (d->do_space == CONFIG_ONDEMAND_ONDEMAND && (space_avail || space_avail_root || space_used))) {
 679                                                         st = rrdset_find_bytype("disk_space", disk);
 680                                                         if(!st) {
 681                                                                 st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 682                                                                 st->isdetail = 1;
 683
 684                                                                 rrddim_add(st, "avail", NULL, 1, 1024*1024*1024, RRDDIM_ABSOLUTE);
 685                                                                 rrddim_add(st, "used" , NULL, 1, 1024*1024*1024, RRDDIM_ABSOLUTE);
 686                                                                 rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1024*1024*1024, RRDDIM_ABSOLUTE);
 687                                                         }
 688                                                         else rrdset_next_usec(st, dt);
 689
 690                                                         rrddim_set(st, "avail", space_avail);
 691                                                         rrddim_set(st, "used", space_used);
 692                                                         rrddim_set(st, "reserved_for_root", space_avail_root);
 693                                                         rrdset_done(st);
 694                                                 }
 695
 696                                                 // --------------------------------------------------------------------------
 697
 698                                                 if(d->do_inodes == CONFIG_ONDEMAND_YES || (d->do_inodes == CONFIG_ONDEMAND_ONDEMAND && (inodes_avail || inodes_avail_root || inodes_used))) {
 699                                                         st = rrdset_find_bytype("disk_inodes", disk);
 700                                                         if(!st) {
 701                                                                 st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", "Disk Inodes Usage", "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 702                                                                 st->isdetail = 1;
 703
 704                                                                 rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 705                                                                 rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 706                                                                 rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 707                                                         }
 708                                                         else rrdset_next_usec(st, dt);
 709
 710                                                         rrddim_set(st, "avail", inodes_avail);
 711                                                         rrddim_set(st, "used", inodes_used);
 712                                                         rrddim_set(st, "reserved_for_root", inodes_avail_root);
 713                                                         rrdset_done(st);
 714                                                 }
 715                                         }
 716                                 }
 717                         }
 718                 }
 719         }
 720
 721         return 0;
 722 }