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_ONDEMAND_ONDEMAND;
  87
  88         if(unlikely(strncmp(mount_point, "/run/user/", 10) == 0))
  89             def_space = CONFIG_ONDEMAND_NO;
  90
  91         // check the user configuration (this will also show our 'on demand' decision)
  92         def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
  93
  94         int ddo_space = def_space,
  95                 ddo_inodes = def_space;
  96
  97         do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
  98         do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
  99     }
 100
 101     if(do_space == CONFIG_ONDEMAND_NO && do_inodes == CONFIG_ONDEMAND_NO)
 102         return;
 103
 104     struct statvfs buff_statvfs;
 105     if (statvfs(mount_point, &buff_statvfs) < 0) {
 106         error("Failed statvfs() for '%s' (disk '%s')", mount_point, disk);
 107         return;
 108     }
 109
 110     // taken from get_fs_usage() found in coreutils
 111     unsigned long bsize = (buff_statvfs.f_frsize) ? buff_statvfs.f_frsize : buff_statvfs.f_bsize;
 112
 113     fsblkcnt_t bavail         = buff_statvfs.f_bavail;
 114     fsblkcnt_t btotal         = buff_statvfs.f_blocks;
 115     fsblkcnt_t bavail_root    = buff_statvfs.f_bfree;
 116     fsblkcnt_t breserved_root = bavail_root - bavail;
 117     fsblkcnt_t bused;
 118     if(likely(btotal >= bavail_root))
 119         bused = btotal - bavail_root;
 120     else
 121         bused = bavail_root - btotal;
 122
 123 #ifdef NETDATA_INTERNAL_CHECKS
 124     if(unlikely(btotal != bavail + breserved_root + bused))
 125         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);
 126 #endif
 127
 128     // --------------------------------------------------------------------------
 129
 130     fsfilcnt_t favail         = buff_statvfs.f_favail;
 131     fsfilcnt_t ftotal         = buff_statvfs.f_files;
 132     fsfilcnt_t favail_root    = buff_statvfs.f_ffree;
 133     fsfilcnt_t freserved_root = favail_root - favail;
 134     fsfilcnt_t fused          = ftotal - favail_root;
 135
 136 #ifdef NETDATA_INTERNAL_CHECKS
 137     if(unlikely(btotal != bavail + breserved_root + bused))
 138         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);
 139 #endif
 140
 141     // --------------------------------------------------------------------------
 142
 143     RRDSET *st;
 144
 145     if(do_space == CONFIG_ONDEMAND_YES || (do_space == CONFIG_ONDEMAND_ONDEMAND && (bavail || breserved_root || bused))) {
 146         st = rrdset_find_bytype("disk_space", disk);
 147         if(!st) {
 148             char title[4096 + 1];
 149             snprintfz(title, 4096, "Disk Space Usage for %s [%s]", family, mount_source);
 150             st = rrdset_create("disk_space", disk, NULL, family, "disk.space", title, "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 151
 152             rrddim_add(st, "avail", NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 153             rrddim_add(st, "used" , NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 154             rrddim_add(st, "reserved_for_root", "reserved for root", bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 155         }
 156         else rrdset_next_usec(st, dt);
 157
 158         rrddim_set(st, "avail", bavail);
 159         rrddim_set(st, "used", bused);
 160         rrddim_set(st, "reserved_for_root", breserved_root);
 161         rrdset_done(st);
 162     }
 163
 164     // --------------------------------------------------------------------------
 165
 166     if(do_inodes == CONFIG_ONDEMAND_YES || (do_inodes == CONFIG_ONDEMAND_ONDEMAND && (favail || freserved_root || fused))) {
 167         st = rrdset_find_bytype("disk_inodes", disk);
 168         if(!st) {
 169             char title[4096 + 1];
 170             snprintfz(title, 4096, "Disk Files (inodes) Usage for %s [%s]", family, mount_source);
 171             st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", title, "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 172
 173             rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 174             rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 175             rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 176         }
 177         else rrdset_next_usec(st, dt);
 178
 179         rrddim_set(st, "avail", favail);
 180         rrddim_set(st, "used", fused);
 181         rrddim_set(st, "reserved_for_root", freserved_root);
 182         rrdset_done(st);
 183     }
 184 }
 185
 186 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
 187     static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 188     static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
 189     static char path_find_block_device[FILENAME_MAX + 1] = "";
 190     struct disk *d;
 191
 192     // search for it in our RAM list.
 193     // this is sequential, but since we just walk through
 194     // and the number of disks / partitions in a system
 195     // should not be that many, it should be acceptable
 196     for(d = disk_root; d ; d = d->next)
 197         if(unlikely(d->major == major && d->minor == minor))
 198             break;
 199
 200     // if we found it, return it
 201     if(likely(d))
 202         return d;
 203
 204     // not found
 205     // create a new disk structure
 206     d = (struct disk *)mallocz(sizeof(struct disk));
 207
 208     d->disk = strdupz(disk);
 209     d->major = major;
 210     d->minor = minor;
 211     d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
 212     d->configured = 0;
 213     d->sector_size = 512; // the default, will be changed below
 214     d->next = NULL;
 215
 216     // append it to the list
 217     if(!disk_root)
 218         disk_root = d;
 219     else {
 220         struct disk *last;
 221         for(last = disk_root; last->next ;last = last->next);
 222         last->next = d;
 223     }
 224
 225     // ------------------------------------------------------------------------
 226     // find the type of the device
 227
 228     char buffer[FILENAME_MAX + 1];
 229
 230     // get the default path for finding info about the block device
 231     if(unlikely(!path_find_block_device[0])) {
 232         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
 233         snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", buffer));
 234     }
 235
 236     // find if it is a partition
 237     // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
 238     snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
 239     if(access(buffer, R_OK) == 0) {
 240         d->type = DISK_TYPE_PARTITION;
 241     } else {
 242         // find if it is a container
 243         // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
 244         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
 245         DIR *dirp = opendir(buffer);
 246         if (dirp != NULL) {
 247             struct dirent *dp;
 248             while( (dp = readdir(dirp)) ) {
 249                 // . and .. are also files in empty folders.
 250                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
 251                     continue;
 252                 }
 253
 254                 d->type = DISK_TYPE_CONTAINER;
 255
 256                 // Stop the loop after we found one file.
 257                 break;
 258             }
 259             if(closedir(dirp) == -1)
 260                 error("Unable to close dir %s", buffer);
 261         }
 262     }
 263
 264     // ------------------------------------------------------------------------
 265     // check if we can find its mount point
 266
 267     // mountinfo_find() can be called with NULL disk_mountinfo_root
 268     struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 269 /*    if(unlikely(!mi)) {
 270         mountinfo_reload(1);
 271
 272         // search again for this disk
 273         mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 274     }
 275 */
 276     if(mi) {
 277         d->mount_point = strdupz(mi->mount_point);
 278         d->mount_point_hash = mi->mount_point_hash;
 279     }
 280     else {
 281         d->mount_point = NULL;
 282         d->mount_point_hash = 0;
 283     }
 284
 285     // ------------------------------------------------------------------------
 286     // find the disk sector size
 287
 288     if(!path_to_get_hw_sector_size[0]) {
 289         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 290         snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", buffer));
 291     }
 292     if(!path_to_get_hw_sector_size_partitions[0]) {
 293         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 294         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));
 295     }
 296
 297     {
 298         char tf[FILENAME_MAX + 1], *t;
 299         strncpyz(tf, d->disk, FILENAME_MAX);
 300
 301         // replace all / with !
 302         for(t = tf; *t ;t++)
 303             if(*t == '/') *t = '!';
 304
 305         if(d->type == DISK_TYPE_PARTITION)
 306             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 307         else
 308             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 309
 310         FILE *fpss = fopen(buffer, "r");
 311         if(fpss) {
 312             char buffer2[1024 + 1];
 313             char *tmp = fgets(buffer2, 1024, fpss);
 314
 315             if(tmp) {
 316                 d->sector_size = atoi(tmp);
 317                 if(d->sector_size <= 0) {
 318                     error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 319                     d->sector_size = 512;
 320                 }
 321             }
 322             else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 323
 324             fclose(fpss);
 325         }
 326         else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 327     }
 328
 329     return d;
 330 }
 331
 332 static inline int select_positive_option(int option1, int option2) {
 333     if(option1 == CONFIG_ONDEMAND_YES || option2 == CONFIG_ONDEMAND_YES)
 334         return CONFIG_ONDEMAND_YES;
 335     else if(option1 == CONFIG_ONDEMAND_ONDEMAND || option2 == CONFIG_ONDEMAND_ONDEMAND)
 336         return CONFIG_ONDEMAND_ONDEMAND;
 337
 338     return CONFIG_ONDEMAND_NO;
 339 }
 340
 341 int do_proc_diskstats(int update_every, unsigned long long dt) {
 342     static procfile *ff = NULL;
 343     static int  global_enable_new_disks_detected_at_runtime = CONFIG_ONDEMAND_YES,
 344                 global_enable_performance_for_physical_disks = CONFIG_ONDEMAND_ONDEMAND,
 345                 global_enable_performance_for_virtual_disks = CONFIG_ONDEMAND_NO,
 346                 global_enable_performance_for_partitions = CONFIG_ONDEMAND_NO,
 347                 global_enable_performance_for_mountpoints = CONFIG_ONDEMAND_NO,
 348                 global_enable_performance_for_virtual_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 349                 global_enable_space_for_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 350                 global_do_io = CONFIG_ONDEMAND_ONDEMAND,
 351                 global_do_ops = CONFIG_ONDEMAND_ONDEMAND,
 352                 global_do_mops = CONFIG_ONDEMAND_ONDEMAND,
 353                 global_do_iotime = CONFIG_ONDEMAND_ONDEMAND,
 354                 global_do_qops = CONFIG_ONDEMAND_ONDEMAND,
 355                 global_do_util = CONFIG_ONDEMAND_ONDEMAND,
 356                 global_do_backlog = CONFIG_ONDEMAND_ONDEMAND,
 357                 global_do_space = CONFIG_ONDEMAND_ONDEMAND,
 358                 global_do_inodes = CONFIG_ONDEMAND_ONDEMAND,
 359                 globals_initialized = 0;
 360
 361     if(unlikely(!globals_initialized)) {
 362         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);
 363
 364         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);
 365         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);
 366         global_enable_performance_for_partitions = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for partitions", global_enable_performance_for_partitions);
 367         global_enable_performance_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted filesystems", global_enable_performance_for_mountpoints);
 368         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);
 369         global_enable_space_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space metrics for mounted filesystems", global_enable_space_for_mountpoints);
 370
 371         global_do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", global_do_io);
 372         global_do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", global_do_ops);
 373         global_do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", global_do_mops);
 374         global_do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", global_do_iotime);
 375         global_do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", global_do_qops);
 376         global_do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", global_do_util);
 377         global_do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", global_do_backlog);
 378         global_do_space   = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", global_do_space);
 379         global_do_inodes  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", global_do_inodes);
 380
 381         globals_initialized = 1;
 382     }
 383
 384     if(!ff) {
 385         char filename[FILENAME_MAX + 1];
 386         snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 387         ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 388     }
 389     if(!ff) return 1;
 390
 391     ff = procfile_readall(ff);
 392     if(!ff) return 0; // we return 0, so that we will retry to open it next time
 393
 394     uint32_t lines = procfile_lines(ff), l;
 395     uint32_t words;
 396
 397     // this is smart enough not to reload it every time
 398     mountinfo_reload(0);
 399
 400     for(l = 0; l < lines ;l++) {
 401         // --------------------------------------------------------------------------
 402         // Read parameters
 403
 404         char *disk;
 405         unsigned long       major = 0, minor = 0;
 406
 407         collected_number    reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 408                             writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 409                             queued_ios = 0, busy_ms = 0, backlog_ms = 0;
 410
 411         collected_number    last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 412                             last_writes = 0, last_writesectors = 0, last_writems = 0,
 413                             last_busy_ms = 0;
 414
 415         words = procfile_linewords(ff, l);
 416         if(words < 14) continue;
 417
 418         major           = strtoul(procfile_lineword(ff, l, 0), NULL, 10);
 419         minor           = strtoul(procfile_lineword(ff, l, 1), NULL, 10);
 420         disk            = procfile_lineword(ff, l, 2);
 421
 422         // # of reads completed # of writes completed
 423         // This is the total number of reads or writes completed successfully.
 424         reads           = strtoull(procfile_lineword(ff, l, 3), NULL, 10);  // rd_ios
 425         writes          = strtoull(procfile_lineword(ff, l, 7), NULL, 10);  // wr_ios
 426
 427         // # of reads merged # of writes merged
 428         // Reads and writes which are adjacent to each other may be merged for
 429         // efficiency.  Thus two 4K reads may become one 8K read before it is
 430         // ultimately handed to the disk, and so it will be counted (and queued)
 431         mreads          = strtoull(procfile_lineword(ff, l, 4), NULL, 10);  // rd_merges_or_rd_sec
 432         mwrites         = strtoull(procfile_lineword(ff, l, 8), NULL, 10);  // wr_merges
 433
 434         // # of sectors read # of sectors written
 435         // This is the total number of sectors read or written successfully.
 436         readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);  // rd_sec_or_wr_ios
 437         writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);  // wr_sec
 438
 439         // # of milliseconds spent reading # of milliseconds spent writing
 440         // This is the total number of milliseconds spent by all reads or writes (as
 441         // measured from __make_request() to end_that_request_last()).
 442         readms          = strtoull(procfile_lineword(ff, l, 6), NULL, 10);  // rd_ticks_or_wr_sec
 443         writems         = strtoull(procfile_lineword(ff, l, 10), NULL, 10); // wr_ticks
 444
 445         // # of I/Os currently in progress
 446         // The only field that should go to zero. Incremented as requests are
 447         // given to appropriate struct request_queue and decremented as they finish.
 448         queued_ios      = strtoull(procfile_lineword(ff, l, 11), NULL, 10); // ios_pgr
 449
 450         // # of milliseconds spent doing I/Os
 451         // This field increases so long as field queued_ios is nonzero.
 452         busy_ms         = strtoull(procfile_lineword(ff, l, 12), NULL, 10); // tot_ticks
 453
 454         // weighted # of milliseconds spent doing I/Os
 455         // This field is incremented at each I/O start, I/O completion, I/O
 456         // merge, or read of these stats by the number of I/Os in progress
 457         // (field queued_ios) times the number of milliseconds spent doing I/O since the
 458         // last update of this field.  This can provide an easy measure of both
 459         // I/O completion time and the backlog that may be accumulating.
 460         backlog_ms      = strtoull(procfile_lineword(ff, l, 13), NULL, 10); // rq_ticks
 461
 462
 463         // --------------------------------------------------------------------------
 464         // remove slashes from disk names
 465         char *s;
 466         for(s = disk; *s ;s++)
 467             if(*s == '/') *s = '_';
 468
 469         // --------------------------------------------------------------------------
 470         // get a disk structure for the disk
 471
 472         struct disk *d = get_disk(major, minor, disk);
 473
 474
 475         // --------------------------------------------------------------------------
 476         // Set its family based on mount point
 477
 478         char *family = d->mount_point;
 479         if(!family) family = disk;
 480
 481
 482         // --------------------------------------------------------------------------
 483         // Check the configuration for the device
 484
 485         if(unlikely(!d->configured)) {
 486             char var_name[4096 + 1];
 487             snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 488
 489             int def_enable = config_get_boolean_ondemand(var_name, "enable", global_enable_new_disks_detected_at_runtime);
 490             if(def_enable == CONFIG_ONDEMAND_NO) {
 491                 // the user does not want any metrics for this disk
 492                 d->do_io = CONFIG_ONDEMAND_NO;
 493                 d->do_ops = CONFIG_ONDEMAND_NO;
 494                 d->do_mops = CONFIG_ONDEMAND_NO;
 495                 d->do_iotime = CONFIG_ONDEMAND_NO;
 496                 d->do_qops = CONFIG_ONDEMAND_NO;
 497                 d->do_util = CONFIG_ONDEMAND_NO;
 498                 d->do_backlog = CONFIG_ONDEMAND_NO;
 499                 d->do_space = CONFIG_ONDEMAND_NO;
 500                 d->do_inodes = CONFIG_ONDEMAND_NO;
 501             }
 502             else {
 503                 // this disk is enabled
 504                 // check its direct settings
 505
 506                 int def_performance = CONFIG_ONDEMAND_ONDEMAND;
 507                 int def_space = (d->mount_point)?CONFIG_ONDEMAND_ONDEMAND:CONFIG_ONDEMAND_NO;
 508
 509                 // since this is 'on demand' we can figure the performance settings
 510                 // based on the type of disk
 511
 512                 switch(d->type) {
 513                     case DISK_TYPE_PHYSICAL:
 514                         def_performance = global_enable_performance_for_physical_disks;
 515                         break;
 516
 517                     case DISK_TYPE_PARTITION:
 518                         def_performance = global_enable_performance_for_partitions;
 519                         break;
 520
 521                     case DISK_TYPE_CONTAINER:
 522                         def_performance = global_enable_performance_for_virtual_disks;
 523
 524                         if(d->mount_point)
 525                             def_performance = select_positive_option(def_performance, global_enable_performance_for_virtual_mountpoints);
 526                         break;
 527                 }
 528
 529                 if(d->mount_point)
 530                     def_performance = select_positive_option(def_performance, global_enable_performance_for_mountpoints);
 531
 532                 // ------------------------------------------------------------
 533                 // now we have def_performance and def_space
 534                 // to work further
 535
 536                 // def_performance
 537                 // check the user configuration (this will also show our 'on demand' decision)
 538                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 539
 540                 int ddo_io = CONFIG_ONDEMAND_NO,
 541                     ddo_ops = CONFIG_ONDEMAND_NO,
 542                     ddo_mops = CONFIG_ONDEMAND_NO,
 543                     ddo_iotime = CONFIG_ONDEMAND_NO,
 544                     ddo_qops = CONFIG_ONDEMAND_NO,
 545                     ddo_util = CONFIG_ONDEMAND_NO,
 546                     ddo_backlog = CONFIG_ONDEMAND_NO;
 547
 548                 // we enable individual performance charts only when def_performance is not disabled
 549                 if(def_performance != CONFIG_ONDEMAND_NO) {
 550                     ddo_io = global_do_io,
 551                     ddo_ops = global_do_ops,
 552                     ddo_mops = global_do_mops,
 553                     ddo_iotime = global_do_iotime,
 554                     ddo_qops = global_do_qops,
 555                     ddo_util = global_do_util,
 556                     ddo_backlog = global_do_backlog;
 557                 }
 558
 559                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 560                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 561                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 562                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 563                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 564                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 565                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 566
 567                 // def_space
 568                 if(d->mount_point) {
 569                     // check the user configuration (this will also show our 'on demand' decision)
 570                     def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 571
 572                     int ddo_space = def_space,
 573                         ddo_inodes = def_space;
 574
 575                     d->do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 576                     d->do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 577                 }
 578                 else {
 579                     // don't show settings for this disk
 580                     d->do_space = CONFIG_ONDEMAND_NO;
 581                     d->do_inodes = CONFIG_ONDEMAND_NO;
 582                 }
 583             }
 584
 585             d->configured = 1;
 586         }
 587
 588         RRDSET *st;
 589
 590         // --------------------------------------------------------------------------
 591         // Do performance metrics
 592
 593         if(d->do_io == CONFIG_ONDEMAND_YES || (d->do_io == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) {
 594             d->do_io = CONFIG_ONDEMAND_YES;
 595
 596             st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 597             if(!st) {
 598                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 599
 600                 rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_INCREMENTAL);
 601                 rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 602             }
 603             else rrdset_next_usec(st, dt);
 604
 605             last_readsectors  = rrddim_set(st, "reads", readsectors);
 606             last_writesectors = rrddim_set(st, "writes", writesectors);
 607             rrdset_done(st);
 608         }
 609
 610         // --------------------------------------------------------------------
 611
 612         if(d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes))) {
 613             d->do_ops = CONFIG_ONDEMAND_YES;
 614
 615             st = rrdset_find_bytype("disk_ops", disk);
 616             if(!st) {
 617                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 618                 st->isdetail = 1;
 619
 620                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 621                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 622             }
 623             else rrdset_next_usec(st, dt);
 624
 625             last_reads  = rrddim_set(st, "reads", reads);
 626             last_writes = rrddim_set(st, "writes", writes);
 627             rrdset_done(st);
 628         }
 629
 630         // --------------------------------------------------------------------
 631
 632         if(d->do_qops == CONFIG_ONDEMAND_YES || (d->do_qops == CONFIG_ONDEMAND_ONDEMAND && queued_ios)) {
 633             d->do_qops = CONFIG_ONDEMAND_YES;
 634
 635             st = rrdset_find_bytype("disk_qops", disk);
 636             if(!st) {
 637                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 638                 st->isdetail = 1;
 639
 640                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 641             }
 642             else rrdset_next_usec(st, dt);
 643
 644             rrddim_set(st, "operations", queued_ios);
 645             rrdset_done(st);
 646         }
 647
 648         // --------------------------------------------------------------------
 649
 650         if(d->do_backlog == CONFIG_ONDEMAND_YES || (d->do_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms)) {
 651             d->do_backlog = CONFIG_ONDEMAND_YES;
 652
 653             st = rrdset_find_bytype("disk_backlog", disk);
 654             if(!st) {
 655                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 656                 st->isdetail = 1;
 657
 658                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 659             }
 660             else rrdset_next_usec(st, dt);
 661
 662             rrddim_set(st, "backlog", backlog_ms);
 663             rrdset_done(st);
 664         }
 665
 666         // --------------------------------------------------------------------
 667
 668         if(d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) {
 669             d->do_util = CONFIG_ONDEMAND_YES;
 670
 671             st = rrdset_find_bytype("disk_util", disk);
 672             if(!st) {
 673                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 674                 st->isdetail = 1;
 675
 676                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 677             }
 678             else rrdset_next_usec(st, dt);
 679
 680             last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 681             rrdset_done(st);
 682         }
 683
 684         // --------------------------------------------------------------------
 685
 686         if(d->do_mops == CONFIG_ONDEMAND_YES || (d->do_mops == CONFIG_ONDEMAND_ONDEMAND && (mreads || mwrites))) {
 687             d->do_mops = CONFIG_ONDEMAND_YES;
 688
 689             st = rrdset_find_bytype("disk_mops", disk);
 690             if(!st) {
 691                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 692                 st->isdetail = 1;
 693
 694                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 695                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 696             }
 697             else rrdset_next_usec(st, dt);
 698
 699             rrddim_set(st, "reads", mreads);
 700             rrddim_set(st, "writes", mwrites);
 701             rrdset_done(st);
 702         }
 703
 704         // --------------------------------------------------------------------
 705
 706         if(d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) {
 707             d->do_iotime = CONFIG_ONDEMAND_YES;
 708
 709             st = rrdset_find_bytype("disk_iotime", disk);
 710             if(!st) {
 711                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 712                 st->isdetail = 1;
 713
 714                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 715                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 716             }
 717             else rrdset_next_usec(st, dt);
 718
 719             last_readms  = rrddim_set(st, "reads", readms);
 720             last_writems = rrddim_set(st, "writes", writems);
 721             rrdset_done(st);
 722         }
 723
 724         // --------------------------------------------------------------------
 725         // calculate differential charts
 726         // only if this is not the first time we run
 727
 728         if(dt) {
 729             if( (d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) &&
 730                 (d->do_ops    == CONFIG_ONDEMAND_YES || (d->do_ops    == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 731                 st = rrdset_find_bytype("disk_await", disk);
 732                 if(!st) {
 733                     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);
 734                     st->isdetail = 1;
 735
 736                     rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 737                     rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 738                 }
 739                 else rrdset_next_usec(st, dt);
 740
 741                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 742                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 743                 rrdset_done(st);
 744             }
 745
 746             if( (d->do_io  == CONFIG_ONDEMAND_YES || (d->do_io  == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) &&
 747                 (d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 748                 st = rrdset_find_bytype("disk_avgsz", disk);
 749                 if(!st) {
 750                     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);
 751                     st->isdetail = 1;
 752
 753                     rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_ABSOLUTE);
 754                     rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_ABSOLUTE);
 755                 }
 756                 else rrdset_next_usec(st, dt);
 757
 758                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 759                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 760                 rrdset_done(st);
 761             }
 762
 763             if( (d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) &&
 764                 (d->do_ops  == CONFIG_ONDEMAND_YES || (d->do_ops  == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 765                 st = rrdset_find_bytype("disk_svctm", disk);
 766                 if(!st) {
 767                     st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 768                     st->isdetail = 1;
 769
 770                     rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 771                 }
 772                 else rrdset_next_usec(st, dt);
 773
 774                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 775                 rrdset_done(st);
 776             }
 777         }
 778
 779 /*
 780         // --------------------------------------------------------------------------
 781         // space metrics
 782
 783         if(d->mount_point && (d->do_space || d->do_inodes) ) {
 784             do_disk_space_stats(d, d->mount_point, disk, disk, family, update_every, dt);
 785         }
 786 */
 787     }
 788
 789     // --------------------------------------------------------------------------
 790     // space metrics for non-block devices
 791
 792     struct mountinfo *mi;
 793     for(mi = disk_mountinfo_root; mi ;mi = mi->next) {
 794         if(unlikely(mi->flags & (MOUNTINFO_IS_DUMMY|MOUNTINFO_IS_BIND|MOUNTINFO_IS_SAME_DEV|MOUNTINFO_NO_STAT|MOUNTINFO_NO_SIZE)))
 795             continue;
 796
 797 /*
 798         // skip the ones with block devices
 799         int skip = 0;
 800         struct disk *d;
 801         for(d = disk_root; d ;d = d->next) {
 802             if(unlikely(d->mount_point && mi->mount_point_hash == d->mount_point_hash && strcmp(mi->mount_point, d->mount_point))) {
 803                 skip = 1;
 804                 break;
 805             }
 806         }
 807
 808         if(unlikely(skip))
 809             continue;
 810
 811         // fprintf(stderr, "Will process mount point '%s', source '%s', filesystem '%s'\n", mi->mount_point, mi->mount_source, mi->filesystem);
 812 */
 813
 814         do_disk_space_stats(NULL, mi->mount_point, mi->mount_source, mi->persistent_id, mi->mount_point , update_every, dt);
 815     }
 816
 817     return 0;
 818 }