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 #ifndef NETDATA_RELOAD_MOUNTINFO_EVERY
  10 #define NETDATA_RELOAD_MOUNTINFO_EVERY 10
  11 #endif
  12
  13 static struct disk {
  14     char *disk;             // the name of the disk (sda, sdb, etc)
  15     unsigned long major;
  16     unsigned long minor;
  17     int sector_size;
  18     int type;
  19
  20     char *mount_point;
  21     uint32_t mount_point_hash;
  22
  23     // disk options caching
  24     int configured;
  25     int do_io;
  26     int do_ops;
  27     int do_mops;
  28     int do_iotime;
  29     int do_qops;
  30     int do_util;
  31     int do_backlog;
  32     int do_space;
  33     int do_inodes;
  34
  35     struct disk *next;
  36 } *disk_root = NULL;
  37
  38 static struct mountinfo *disk_mountinfo_root = NULL;
  39
  40 static inline void mountinfo_reload(int force) {
  41     static time_t last_loaded = 0;
  42     time_t now = time(NULL);
  43
  44     if(force || now - last_loaded >= NETDATA_RELOAD_MOUNTINFO_EVERY) {
  45 //#ifdef NETDATA_INTERNAL_CHECKS
  46 //        info("Reloading mountinfo");
  47 //#endif
  48
  49         // mountinfo_free() can be called with NULL disk_mountinfo_root
  50         mountinfo_free(disk_mountinfo_root);
  51
  52         // re-read mountinfo in case something changed
  53         disk_mountinfo_root = mountinfo_read();
  54
  55         last_loaded = now;
  56     }
  57 }
  58
  59 static inline void do_disk_space_stats(struct disk *d, const char *mount_point, const char *mount_source, const char *disk, const char *family, int update_every, unsigned long long dt) {
  60     int do_space, do_inodes;
  61
  62     if(d) {
  63         // verify we collected the metrics for the right disk.
  64         // if not the mountpoint has changed.
  65
  66         struct stat buff_stat;
  67         if(stat(mount_point, &buff_stat) == -1) {
  68             error("Failed to stat() for '%s' (disk '%s')", mount_point, disk);
  69             return;
  70         }
  71         else if(major(buff_stat.st_dev) != d->major || minor(buff_stat.st_dev) != d->minor) {
  72             error("Disk '%s' (disk '%s') switched major:minor", mount_point, disk);
  73             freez(d->mount_point);
  74             d->mount_point = NULL;
  75             d->mount_point_hash = 0;
  76             return;
  77         }
  78
  79         do_space = d->do_space;
  80         do_inodes = d->do_inodes;
  81     }
  82     else {
  83         char var_name[4096 + 1];
  84         snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", mount_point);
  85
  86         int def_space = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
  87         int def_inodes = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
  88
  89         if(unlikely(strncmp(mount_point, "/run/user/", 10) == 0)) {
  90             def_space = CONFIG_ONDEMAND_NO;
  91             def_inodes = CONFIG_ONDEMAND_NO;
  92         }
  93
  94         do_space = config_get_boolean_ondemand(var_name, "space usage", def_space);
  95         do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", def_inodes);
  96     }
  97
  98     if(do_space == CONFIG_ONDEMAND_NO && do_inodes == CONFIG_ONDEMAND_NO)
  99         return;
 100
 101     struct statvfs buff_statvfs;
 102     if (statvfs(mount_point, &buff_statvfs) < 0) {
 103         error("Failed statvfs() for '%s' (disk '%s')", mount_point, disk);
 104         return;
 105     }
 106
 107     // taken from get_fs_usage() found in coreutils
 108     unsigned long bsize = (buff_statvfs.f_frsize) ? buff_statvfs.f_frsize : buff_statvfs.f_bsize;
 109
 110     fsblkcnt_t bavail         = buff_statvfs.f_bavail;
 111     fsblkcnt_t btotal         = buff_statvfs.f_blocks;
 112     fsblkcnt_t bavail_root    = buff_statvfs.f_bfree;
 113     fsblkcnt_t breserved_root = bavail_root - bavail;
 114     fsblkcnt_t bused;
 115     if(likely(btotal >= bavail_root))
 116         bused = btotal - bavail_root;
 117     else
 118         bused = bavail_root - btotal;
 119
 120 #ifdef NETDATA_INTERNAL_CHECKS
 121     if(unlikely(btotal != bavail + breserved_root + bused))
 122         error("Disk block statistics for '%s' (disk '%s') do not sum up: total = %llu, available = %llu, reserved = %llu, used = %llu", mount_point, disk, (unsigned long long)btotal, (unsigned long long)bavail, (unsigned long long)breserved_root, (unsigned long long)bused);
 123 #endif
 124
 125     // --------------------------------------------------------------------------
 126
 127     fsfilcnt_t favail         = buff_statvfs.f_favail;
 128     fsfilcnt_t ftotal         = buff_statvfs.f_files;
 129     fsfilcnt_t favail_root    = buff_statvfs.f_ffree;
 130     fsfilcnt_t freserved_root = favail_root - favail;
 131     fsfilcnt_t fused          = ftotal - favail_root;
 132
 133 #ifdef NETDATA_INTERNAL_CHECKS
 134     if(unlikely(btotal != bavail + breserved_root + bused))
 135         error("Disk inode statistics for '%s' (disk '%s') do not sum up: total = %llu, available = %llu, reserved = %llu, used = %llu", mount_point, disk, (unsigned long long)ftotal, (unsigned long long)favail, (unsigned long long)freserved_root, (unsigned long long)fused);
 136 #endif
 137
 138     // --------------------------------------------------------------------------
 139
 140     RRDSET *st;
 141
 142     if(do_space == CONFIG_ONDEMAND_YES || (do_space == CONFIG_ONDEMAND_ONDEMAND && (bavail || breserved_root || bused))) {
 143         st = rrdset_find_bytype("disk_space", disk);
 144         if(!st) {
 145             char title[4096 + 1];
 146             snprintfz(title, 4096, "Disk Space Usage for %s [%s]", family, mount_source);
 147             st = rrdset_create("disk_space", disk, NULL, family, "disk.space", title, "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 148
 149             rrddim_add(st, "avail", NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 150             rrddim_add(st, "used" , NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 151             rrddim_add(st, "reserved_for_root", "reserved for root", bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 152         }
 153         else rrdset_next_usec(st, dt);
 154
 155         rrddim_set(st, "avail", bavail);
 156         rrddim_set(st, "used", bused);
 157         rrddim_set(st, "reserved_for_root", breserved_root);
 158         rrdset_done(st);
 159     }
 160
 161     // --------------------------------------------------------------------------
 162
 163     if(do_inodes == CONFIG_ONDEMAND_YES || (do_inodes == CONFIG_ONDEMAND_ONDEMAND && (favail || freserved_root || fused))) {
 164         st = rrdset_find_bytype("disk_inodes", disk);
 165         if(!st) {
 166             char title[4096 + 1];
 167             snprintfz(title, 4096, "Disk Files (inodes) Usage for %s [%s]", family, mount_source);
 168             st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", title, "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 169
 170             rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 171             rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 172             rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 173         }
 174         else rrdset_next_usec(st, dt);
 175
 176         rrddim_set(st, "avail", favail);
 177         rrddim_set(st, "used", fused);
 178         rrddim_set(st, "reserved_for_root", freserved_root);
 179         rrdset_done(st);
 180     }
 181 }
 182
 183 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
 184     static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 185     static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
 186     static char path_find_block_device[FILENAME_MAX + 1] = "";
 187     struct disk *d;
 188
 189     // search for it in our RAM list.
 190     // this is sequential, but since we just walk through
 191     // and the number of disks / partitions in a system
 192     // should not be that many, it should be acceptable
 193     for(d = disk_root; d ; d = d->next)
 194         if(unlikely(d->major == major && d->minor == minor))
 195             break;
 196
 197     // if we found it, return it
 198     if(likely(d))
 199         return d;
 200
 201     // not found
 202     // create a new disk structure
 203     d = (struct disk *)mallocz(sizeof(struct disk));
 204
 205     d->disk = strdupz(disk);
 206     d->major = major;
 207     d->minor = minor;
 208     d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
 209     d->configured = 0;
 210     d->sector_size = 512; // the default, will be changed below
 211     d->next = NULL;
 212
 213     // append it to the list
 214     if(!disk_root)
 215         disk_root = d;
 216     else {
 217         struct disk *last;
 218         for(last = disk_root; last->next ;last = last->next);
 219         last->next = d;
 220     }
 221
 222     // ------------------------------------------------------------------------
 223     // find the type of the device
 224
 225     char buffer[FILENAME_MAX + 1];
 226
 227     // get the default path for finding info about the block device
 228     if(unlikely(!path_find_block_device[0])) {
 229         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
 230         snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", buffer));
 231     }
 232
 233     // find if it is a partition
 234     // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
 235     snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
 236     if(access(buffer, R_OK) == 0) {
 237         d->type = DISK_TYPE_PARTITION;
 238     } else {
 239         // find if it is a container
 240         // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
 241         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
 242         DIR *dirp = opendir(buffer);
 243         if (dirp != NULL) {
 244             struct dirent *dp;
 245             while( (dp = readdir(dirp)) ) {
 246                 // . and .. are also files in empty folders.
 247                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
 248                     continue;
 249                 }
 250
 251                 d->type = DISK_TYPE_CONTAINER;
 252
 253                 // Stop the loop after we found one file.
 254                 break;
 255             }
 256             if(closedir(dirp) == -1)
 257                 error("Unable to close dir %s", buffer);
 258         }
 259     }
 260
 261     // ------------------------------------------------------------------------
 262     // check if we can find its mount point
 263
 264     // mountinfo_find() can be called with NULL disk_mountinfo_root
 265     struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 266 /*    if(unlikely(!mi)) {
 267         mountinfo_reload(1);
 268
 269         // search again for this disk
 270         mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 271     }
 272 */
 273     if(mi) {
 274         d->mount_point = strdupz(mi->mount_point);
 275         d->mount_point_hash = mi->mount_point_hash;
 276     }
 277     else {
 278         d->mount_point = NULL;
 279         d->mount_point_hash = 0;
 280     }
 281
 282     // ------------------------------------------------------------------------
 283     // find the disk sector size
 284
 285     if(!path_to_get_hw_sector_size[0]) {
 286         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 287         snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", buffer));
 288     }
 289     if(!path_to_get_hw_sector_size_partitions[0]) {
 290         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 291         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));
 292     }
 293
 294     {
 295         char tf[FILENAME_MAX + 1], *t;
 296         strncpyz(tf, d->disk, FILENAME_MAX);
 297
 298         // replace all / with !
 299         for(t = tf; *t ;t++)
 300             if(*t == '/') *t = '!';
 301
 302         if(d->type == DISK_TYPE_PARTITION)
 303             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 304         else
 305             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 306
 307         FILE *fpss = fopen(buffer, "r");
 308         if(fpss) {
 309             char buffer2[1024 + 1];
 310             char *tmp = fgets(buffer2, 1024, fpss);
 311
 312             if(tmp) {
 313                 d->sector_size = atoi(tmp);
 314                 if(d->sector_size <= 0) {
 315                     error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 316                     d->sector_size = 512;
 317                 }
 318             }
 319             else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 320
 321             fclose(fpss);
 322         }
 323         else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 324     }
 325
 326     return d;
 327 }
 328
 329 static inline int select_positive_option(int option1, int option2) {
 330     if(option1 == CONFIG_ONDEMAND_YES || option2 == CONFIG_ONDEMAND_YES)
 331         return CONFIG_ONDEMAND_YES;
 332     else if(option1 == CONFIG_ONDEMAND_ONDEMAND || option2 == CONFIG_ONDEMAND_ONDEMAND)
 333         return CONFIG_ONDEMAND_ONDEMAND;
 334
 335     return CONFIG_ONDEMAND_NO;
 336 }
 337
 338 int do_proc_diskstats(int update_every, unsigned long long dt) {
 339     static procfile *ff = NULL;
 340     static int  global_enable_new_disks_detected_at_runtime = CONFIG_ONDEMAND_YES,
 341                 global_enable_performance_for_physical_disks = CONFIG_ONDEMAND_ONDEMAND,
 342                 global_enable_performance_for_virtual_disks = CONFIG_ONDEMAND_NO,
 343                 global_enable_performance_for_partitions = CONFIG_ONDEMAND_NO,
 344                 global_enable_performance_for_mountpoints = CONFIG_ONDEMAND_NO,
 345                 global_enable_performance_for_virtual_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 346                 global_do_io = CONFIG_ONDEMAND_ONDEMAND,
 347                 global_do_ops = CONFIG_ONDEMAND_ONDEMAND,
 348                 global_do_mops = CONFIG_ONDEMAND_ONDEMAND,
 349                 global_do_iotime = CONFIG_ONDEMAND_ONDEMAND,
 350                 global_do_qops = CONFIG_ONDEMAND_ONDEMAND,
 351                 global_do_util = CONFIG_ONDEMAND_ONDEMAND,
 352                 global_do_backlog = CONFIG_ONDEMAND_ONDEMAND,
 353                 globals_initialized = 0;
 354
 355     if(unlikely(!globals_initialized)) {
 356         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);
 357
 358         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);
 359         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);
 360         global_enable_performance_for_partitions = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for partitions", global_enable_performance_for_partitions);
 361         global_enable_performance_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted filesystems", global_enable_performance_for_mountpoints);
 362         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);
 363
 364         global_do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", global_do_io);
 365         global_do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", global_do_ops);
 366         global_do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", global_do_mops);
 367         global_do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", global_do_iotime);
 368         global_do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", global_do_qops);
 369         global_do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", global_do_util);
 370         global_do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", global_do_backlog);
 371
 372         globals_initialized = 1;
 373     }
 374
 375     if(!ff) {
 376         char filename[FILENAME_MAX + 1];
 377         snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 378         ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 379     }
 380     if(!ff) return 1;
 381
 382     ff = procfile_readall(ff);
 383     if(!ff) return 0; // we return 0, so that we will retry to open it next time
 384
 385     uint32_t lines = procfile_lines(ff), l;
 386     uint32_t words;
 387
 388     // this is smart enough not to reload it every time
 389     mountinfo_reload(0);
 390
 391     for(l = 0; l < lines ;l++) {
 392         // --------------------------------------------------------------------------
 393         // Read parameters
 394
 395         char *disk;
 396         unsigned long       major = 0, minor = 0;
 397
 398         collected_number    reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 399                             writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 400                             queued_ios = 0, busy_ms = 0, backlog_ms = 0;
 401
 402         collected_number    last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 403                             last_writes = 0, last_writesectors = 0, last_writems = 0,
 404                             last_busy_ms = 0;
 405
 406         words = procfile_linewords(ff, l);
 407         if(words < 14) continue;
 408
 409         major           = strtoul(procfile_lineword(ff, l, 0), NULL, 10);
 410         minor           = strtoul(procfile_lineword(ff, l, 1), NULL, 10);
 411         disk            = procfile_lineword(ff, l, 2);
 412
 413         // # of reads completed # of writes completed
 414         // This is the total number of reads or writes completed successfully.
 415         reads           = strtoull(procfile_lineword(ff, l, 3), NULL, 10);  // rd_ios
 416         writes          = strtoull(procfile_lineword(ff, l, 7), NULL, 10);  // wr_ios
 417
 418         // # of reads merged # of writes merged
 419         // Reads and writes which are adjacent to each other may be merged for
 420         // efficiency.  Thus two 4K reads may become one 8K read before it is
 421         // ultimately handed to the disk, and so it will be counted (and queued)
 422         mreads          = strtoull(procfile_lineword(ff, l, 4), NULL, 10);  // rd_merges_or_rd_sec
 423         mwrites         = strtoull(procfile_lineword(ff, l, 8), NULL, 10);  // wr_merges
 424
 425         // # of sectors read # of sectors written
 426         // This is the total number of sectors read or written successfully.
 427         readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);  // rd_sec_or_wr_ios
 428         writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);  // wr_sec
 429
 430         // # of milliseconds spent reading # of milliseconds spent writing
 431         // This is the total number of milliseconds spent by all reads or writes (as
 432         // measured from __make_request() to end_that_request_last()).
 433         readms          = strtoull(procfile_lineword(ff, l, 6), NULL, 10);  // rd_ticks_or_wr_sec
 434         writems         = strtoull(procfile_lineword(ff, l, 10), NULL, 10); // wr_ticks
 435
 436         // # of I/Os currently in progress
 437         // The only field that should go to zero. Incremented as requests are
 438         // given to appropriate struct request_queue and decremented as they finish.
 439         queued_ios      = strtoull(procfile_lineword(ff, l, 11), NULL, 10); // ios_pgr
 440
 441         // # of milliseconds spent doing I/Os
 442         // This field increases so long as field queued_ios is nonzero.
 443         busy_ms         = strtoull(procfile_lineword(ff, l, 12), NULL, 10); // tot_ticks
 444
 445         // weighted # of milliseconds spent doing I/Os
 446         // This field is incremented at each I/O start, I/O completion, I/O
 447         // merge, or read of these stats by the number of I/Os in progress
 448         // (field queued_ios) times the number of milliseconds spent doing I/O since the
 449         // last update of this field.  This can provide an easy measure of both
 450         // I/O completion time and the backlog that may be accumulating.
 451         backlog_ms      = strtoull(procfile_lineword(ff, l, 13), NULL, 10); // rq_ticks
 452
 453
 454         // --------------------------------------------------------------------------
 455         // remove slashes from disk names
 456         char *s;
 457         for(s = disk; *s ;s++)
 458             if(*s == '/') *s = '_';
 459
 460         // --------------------------------------------------------------------------
 461         // get a disk structure for the disk
 462
 463         struct disk *d = get_disk(major, minor, disk);
 464
 465
 466         // --------------------------------------------------------------------------
 467         // Set its family based on mount point
 468
 469         char *family = d->mount_point;
 470         if(!family) family = disk;
 471
 472
 473         // --------------------------------------------------------------------------
 474         // Check the configuration for the device
 475
 476         if(unlikely(!d->configured)) {
 477             char var_name[4096 + 1];
 478             snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 479
 480             int def_enable = config_get_boolean_ondemand(var_name, "enable", global_enable_new_disks_detected_at_runtime);
 481             if(def_enable == CONFIG_ONDEMAND_NO) {
 482                 // the user does not want any metrics for this disk
 483                 d->do_io = CONFIG_ONDEMAND_NO;
 484                 d->do_ops = CONFIG_ONDEMAND_NO;
 485                 d->do_mops = CONFIG_ONDEMAND_NO;
 486                 d->do_iotime = CONFIG_ONDEMAND_NO;
 487                 d->do_qops = CONFIG_ONDEMAND_NO;
 488                 d->do_util = CONFIG_ONDEMAND_NO;
 489                 d->do_backlog = CONFIG_ONDEMAND_NO;
 490                 d->do_space = CONFIG_ONDEMAND_NO;
 491                 d->do_inodes = CONFIG_ONDEMAND_NO;
 492             }
 493             else {
 494                 // this disk is enabled
 495                 // check its direct settings
 496
 497                 int def_performance = CONFIG_ONDEMAND_ONDEMAND;
 498                 int def_space = (d->mount_point)?CONFIG_ONDEMAND_ONDEMAND:CONFIG_ONDEMAND_NO;
 499
 500                 // since this is 'on demand' we can figure the performance settings
 501                 // based on the type of disk
 502
 503                 switch(d->type) {
 504                     case DISK_TYPE_PHYSICAL:
 505                         def_performance = global_enable_performance_for_physical_disks;
 506                         break;
 507
 508                     case DISK_TYPE_PARTITION:
 509                         def_performance = global_enable_performance_for_partitions;
 510                         break;
 511
 512                     case DISK_TYPE_CONTAINER:
 513                         def_performance = global_enable_performance_for_virtual_disks;
 514
 515                         if(d->mount_point)
 516                             def_performance = select_positive_option(def_performance, global_enable_performance_for_virtual_mountpoints);
 517                         break;
 518                 }
 519
 520                 if(d->mount_point)
 521                     def_performance = select_positive_option(def_performance, global_enable_performance_for_mountpoints);
 522
 523                 // ------------------------------------------------------------
 524                 // now we have def_performance and def_space
 525                 // to work further
 526
 527                 // def_performance
 528                 // check the user configuration (this will also show our 'on demand' decision)
 529                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 530
 531                 int ddo_io = CONFIG_ONDEMAND_NO,
 532                     ddo_ops = CONFIG_ONDEMAND_NO,
 533                     ddo_mops = CONFIG_ONDEMAND_NO,
 534                     ddo_iotime = CONFIG_ONDEMAND_NO,
 535                     ddo_qops = CONFIG_ONDEMAND_NO,
 536                     ddo_util = CONFIG_ONDEMAND_NO,
 537                     ddo_backlog = CONFIG_ONDEMAND_NO;
 538
 539                 // we enable individual performance charts only when def_performance is not disabled
 540                 if(def_performance != CONFIG_ONDEMAND_NO) {
 541                     ddo_io = global_do_io,
 542                     ddo_ops = global_do_ops,
 543                     ddo_mops = global_do_mops,
 544                     ddo_iotime = global_do_iotime,
 545                     ddo_qops = global_do_qops,
 546                     ddo_util = global_do_util,
 547                     ddo_backlog = global_do_backlog;
 548                 }
 549
 550                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 551                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 552                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 553                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 554                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 555                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 556                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 557
 558                 // def_space
 559                 if(d->mount_point) {
 560                     // check the user configuration (this will also show our 'on demand' decision)
 561                     def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 562
 563                     int ddo_space = def_space,
 564                         ddo_inodes = def_space;
 565
 566                     d->do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 567                     d->do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 568                 }
 569                 else {
 570                     // don't show settings for this disk
 571                     d->do_space = CONFIG_ONDEMAND_NO;
 572                     d->do_inodes = CONFIG_ONDEMAND_NO;
 573                 }
 574             }
 575
 576             d->configured = 1;
 577         }
 578
 579         RRDSET *st;
 580
 581         // --------------------------------------------------------------------------
 582         // Do performance metrics
 583
 584         if(d->do_io == CONFIG_ONDEMAND_YES || (d->do_io == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) {
 585             d->do_io = CONFIG_ONDEMAND_YES;
 586
 587             st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 588             if(!st) {
 589                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 590
 591                 rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_INCREMENTAL);
 592                 rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 593             }
 594             else rrdset_next_usec(st, dt);
 595
 596             last_readsectors  = rrddim_set(st, "reads", readsectors);
 597             last_writesectors = rrddim_set(st, "writes", writesectors);
 598             rrdset_done(st);
 599         }
 600
 601         // --------------------------------------------------------------------
 602
 603         if(d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes))) {
 604             d->do_ops = CONFIG_ONDEMAND_YES;
 605
 606             st = rrdset_find_bytype("disk_ops", disk);
 607             if(!st) {
 608                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 609                 st->isdetail = 1;
 610
 611                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 612                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 613             }
 614             else rrdset_next_usec(st, dt);
 615
 616             last_reads  = rrddim_set(st, "reads", reads);
 617             last_writes = rrddim_set(st, "writes", writes);
 618             rrdset_done(st);
 619         }
 620
 621         // --------------------------------------------------------------------
 622
 623         if(d->do_qops == CONFIG_ONDEMAND_YES || (d->do_qops == CONFIG_ONDEMAND_ONDEMAND && queued_ios)) {
 624             d->do_qops = CONFIG_ONDEMAND_YES;
 625
 626             st = rrdset_find_bytype("disk_qops", disk);
 627             if(!st) {
 628                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 629                 st->isdetail = 1;
 630
 631                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 632             }
 633             else rrdset_next_usec(st, dt);
 634
 635             rrddim_set(st, "operations", queued_ios);
 636             rrdset_done(st);
 637         }
 638
 639         // --------------------------------------------------------------------
 640
 641         if(d->do_backlog == CONFIG_ONDEMAND_YES || (d->do_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms)) {
 642             d->do_backlog = CONFIG_ONDEMAND_YES;
 643
 644             st = rrdset_find_bytype("disk_backlog", disk);
 645             if(!st) {
 646                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 647                 st->isdetail = 1;
 648
 649                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 650             }
 651             else rrdset_next_usec(st, dt);
 652
 653             rrddim_set(st, "backlog", backlog_ms);
 654             rrdset_done(st);
 655         }
 656
 657         // --------------------------------------------------------------------
 658
 659         if(d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) {
 660             d->do_util = CONFIG_ONDEMAND_YES;
 661
 662             st = rrdset_find_bytype("disk_util", disk);
 663             if(!st) {
 664                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 665                 st->isdetail = 1;
 666
 667                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 668             }
 669             else rrdset_next_usec(st, dt);
 670
 671             last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 672             rrdset_done(st);
 673         }
 674
 675         // --------------------------------------------------------------------
 676
 677         if(d->do_mops == CONFIG_ONDEMAND_YES || (d->do_mops == CONFIG_ONDEMAND_ONDEMAND && (mreads || mwrites))) {
 678             d->do_mops = CONFIG_ONDEMAND_YES;
 679
 680             st = rrdset_find_bytype("disk_mops", disk);
 681             if(!st) {
 682                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 683                 st->isdetail = 1;
 684
 685                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 686                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 687             }
 688             else rrdset_next_usec(st, dt);
 689
 690             rrddim_set(st, "reads", mreads);
 691             rrddim_set(st, "writes", mwrites);
 692             rrdset_done(st);
 693         }
 694
 695         // --------------------------------------------------------------------
 696
 697         if(d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) {
 698             d->do_iotime = CONFIG_ONDEMAND_YES;
 699
 700             st = rrdset_find_bytype("disk_iotime", disk);
 701             if(!st) {
 702                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 703                 st->isdetail = 1;
 704
 705                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 706                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 707             }
 708             else rrdset_next_usec(st, dt);
 709
 710             last_readms  = rrddim_set(st, "reads", readms);
 711             last_writems = rrddim_set(st, "writes", writems);
 712             rrdset_done(st);
 713         }
 714
 715         // --------------------------------------------------------------------
 716         // calculate differential charts
 717         // only if this is not the first time we run
 718
 719         if(dt) {
 720             if( (d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) &&
 721                 (d->do_ops    == CONFIG_ONDEMAND_YES || (d->do_ops    == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 722                 st = rrdset_find_bytype("disk_await", disk);
 723                 if(!st) {
 724                     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);
 725                     st->isdetail = 1;
 726
 727                     rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 728                     rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 729                 }
 730                 else rrdset_next_usec(st, dt);
 731
 732                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 733                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 734                 rrdset_done(st);
 735             }
 736
 737             if( (d->do_io  == CONFIG_ONDEMAND_YES || (d->do_io  == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) &&
 738                 (d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 739                 st = rrdset_find_bytype("disk_avgsz", disk);
 740                 if(!st) {
 741                     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);
 742                     st->isdetail = 1;
 743
 744                     rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_ABSOLUTE);
 745                     rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_ABSOLUTE);
 746                 }
 747                 else rrdset_next_usec(st, dt);
 748
 749                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 750                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 751                 rrdset_done(st);
 752             }
 753
 754             if( (d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) &&
 755                 (d->do_ops  == CONFIG_ONDEMAND_YES || (d->do_ops  == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 756                 st = rrdset_find_bytype("disk_svctm", disk);
 757                 if(!st) {
 758                     st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 759                     st->isdetail = 1;
 760
 761                     rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 762                 }
 763                 else rrdset_next_usec(st, dt);
 764
 765                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 766                 rrdset_done(st);
 767             }
 768         }
 769
 770 /*
 771         // --------------------------------------------------------------------------
 772         // space metrics
 773
 774         if(d->mount_point && (d->do_space || d->do_inodes) ) {
 775             do_disk_space_stats(d, d->mount_point, disk, disk, family, update_every, dt);
 776         }
 777 */
 778     }
 779
 780     // --------------------------------------------------------------------------
 781     // space metrics for non-block devices
 782
 783     struct mountinfo *mi;
 784     for(mi = disk_mountinfo_root; mi ;mi = mi->next) {
 785         if(unlikely(mi->flags & (MOUNTINFO_IS_DUMMY|MOUNTINFO_IS_BIND|MOUNTINFO_IS_SAME_DEV|MOUNTINFO_NO_STAT|MOUNTINFO_NO_SIZE)))
 786             continue;
 787
 788 /*
 789         // skip the ones with block devices
 790         int skip = 0;
 791         struct disk *d;
 792         for(d = disk_root; d ;d = d->next) {
 793             if(unlikely(d->mount_point && mi->mount_point_hash == d->mount_point_hash && strcmp(mi->mount_point, d->mount_point))) {
 794                 skip = 1;
 795                 break;
 796             }
 797         }
 798
 799         if(unlikely(skip))
 800             continue;
 801
 802         // fprintf(stderr, "Will process mount point '%s', source '%s', filesystem '%s'\n", mi->mount_point, mi->mount_source, mi->filesystem);
 803 */
 804
 805         do_disk_space_stats(NULL, mi->mount_point, mi->mount_source, mi->persistent_id, mi->mount_point , update_every, dt);
 806     }
 807
 808     return 0;
 809 }