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     struct statvfs buff_statvfs;
  61     if (statvfs(mount_point, &buff_statvfs) < 0) {
  62         error("Failed statvfs() for '%s' (disk '%s')", mount_point, disk);
  63         return;
  64     }
  65
  66     int do_space, do_inodes;
  67
  68     if(d) {
  69         // verify we collected the metrics for the right disk.
  70         // if not the mountpoint has changed.
  71
  72         struct stat buff_stat;
  73         if(stat(mount_point, &buff_stat) == -1) {
  74             error("Failed to stat() for '%s' (disk '%s')", mount_point, disk);
  75             return;
  76         }
  77         else if(major(buff_stat.st_dev) != d->major || minor(buff_stat.st_dev) != d->minor) {
  78             error("Disk '%s' (disk '%s') switched major:minor", mount_point, disk);
  79             freez(d->mount_point);
  80             d->mount_point = NULL;
  81             d->mount_point_hash = 0;
  82             return;
  83         }
  84
  85         do_space = d->do_space;
  86         do_inodes = d->do_inodes;
  87     }
  88     else {
  89         char var_name[4096 + 1];
  90         snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", mount_point);
  91
  92         int def_space = CONFIG_ONDEMAND_ONDEMAND;
  93
  94         // check the user configuration (this will also show our 'on demand' decision)
  95         def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
  96
  97         int ddo_space = def_space,
  98                 ddo_inodes = def_space;
  99
 100         do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 101         do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 102     }
 103
 104     // taken from get_fs_usage() found in coreutils
 105     unsigned long bsize = (buff_statvfs.f_frsize) ? buff_statvfs.f_frsize : buff_statvfs.f_bsize;
 106
 107     fsblkcnt_t bavail         = buff_statvfs.f_bavail;
 108     fsblkcnt_t btotal         = buff_statvfs.f_blocks;
 109     fsblkcnt_t bavail_root    = buff_statvfs.f_bfree;
 110     fsblkcnt_t breserved_root = bavail_root - bavail;
 111     fsblkcnt_t bused;
 112     if(likely(btotal >= bavail_root))
 113         bused = btotal - bavail_root;
 114     else
 115         bused = bavail_root - btotal;
 116
 117 #ifdef NETDATA_INTERNAL_CHECKS
 118     if(unlikely(btotal != bavail + breserved_root + bused))
 119         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);
 120 #endif
 121
 122     // --------------------------------------------------------------------------
 123
 124     fsfilcnt_t favail         = buff_statvfs.f_favail;
 125     fsfilcnt_t ftotal         = buff_statvfs.f_files;
 126     fsfilcnt_t favail_root    = buff_statvfs.f_ffree;
 127     fsfilcnt_t freserved_root = favail_root - favail;
 128     fsfilcnt_t fused          = ftotal - favail_root;
 129
 130 #ifdef NETDATA_INTERNAL_CHECKS
 131     if(unlikely(btotal != bavail + breserved_root + bused))
 132         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);
 133 #endif
 134
 135     // --------------------------------------------------------------------------
 136
 137     RRDSET *st;
 138
 139     if(do_space == CONFIG_ONDEMAND_YES || (do_space == CONFIG_ONDEMAND_ONDEMAND && (bavail || breserved_root || bused))) {
 140         st = rrdset_find_bytype("disk_space", disk);
 141         if(!st) {
 142             char title[4096 + 1];
 143             snprintfz(title, 4096, "Disk Space Usage for %s [%s]", family, mount_source);
 144             st = rrdset_create("disk_space", disk, NULL, family, "disk.space", title, "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 145
 146             rrddim_add(st, "avail", NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 147             rrddim_add(st, "used" , NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 148             rrddim_add(st, "reserved_for_root", "reserved for root", bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 149         }
 150         else rrdset_next_usec(st, dt);
 151
 152         rrddim_set(st, "avail", bavail);
 153         rrddim_set(st, "used", bused);
 154         rrddim_set(st, "reserved_for_root", breserved_root);
 155         rrdset_done(st);
 156     }
 157
 158     // --------------------------------------------------------------------------
 159
 160     if(do_inodes == CONFIG_ONDEMAND_YES || (do_inodes == CONFIG_ONDEMAND_ONDEMAND && (favail || freserved_root || fused))) {
 161         st = rrdset_find_bytype("disk_inodes", disk);
 162         if(!st) {
 163             char title[4096 + 1];
 164             snprintfz(title, 4096, "Disk Files (inodes) Usage for %s [%s]", family, mount_source);
 165             st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", title, "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 166
 167             rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 168             rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 169             rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 170         }
 171         else rrdset_next_usec(st, dt);
 172
 173         rrddim_set(st, "avail", favail);
 174         rrddim_set(st, "used", fused);
 175         rrddim_set(st, "reserved_for_root", freserved_root);
 176         rrdset_done(st);
 177     }
 178 }
 179
 180 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
 181     static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 182     static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
 183     static char path_find_block_device[FILENAME_MAX + 1] = "";
 184     struct disk *d;
 185
 186     // search for it in our RAM list.
 187     // this is sequential, but since we just walk through
 188     // and the number of disks / partitions in a system
 189     // should not be that many, it should be acceptable
 190     for(d = disk_root; d ; d = d->next)
 191         if(unlikely(d->major == major && d->minor == minor))
 192             break;
 193
 194     // if we found it, return it
 195     if(likely(d))
 196         return d;
 197
 198     // not found
 199     // create a new disk structure
 200     d = (struct disk *)mallocz(sizeof(struct disk));
 201
 202     d->disk = strdupz(disk);
 203     d->major = major;
 204     d->minor = minor;
 205     d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
 206     d->configured = 0;
 207     d->sector_size = 512; // the default, will be changed below
 208     d->next = NULL;
 209
 210     // append it to the list
 211     if(!disk_root)
 212         disk_root = d;
 213     else {
 214         struct disk *last;
 215         for(last = disk_root; last->next ;last = last->next);
 216         last->next = d;
 217     }
 218
 219     // ------------------------------------------------------------------------
 220     // find the type of the device
 221
 222     char buffer[FILENAME_MAX + 1];
 223
 224     // get the default path for finding info about the block device
 225     if(unlikely(!path_find_block_device[0])) {
 226         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
 227         snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", buffer));
 228     }
 229
 230     // find if it is a partition
 231     // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
 232     snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
 233     if(access(buffer, R_OK) == 0) {
 234         d->type = DISK_TYPE_PARTITION;
 235     } else {
 236         // find if it is a container
 237         // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
 238         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
 239         DIR *dirp = opendir(buffer);
 240         if (dirp != NULL) {
 241             struct dirent *dp;
 242             while( (dp = readdir(dirp)) ) {
 243                 // . and .. are also files in empty folders.
 244                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
 245                     continue;
 246                 }
 247
 248                 d->type = DISK_TYPE_CONTAINER;
 249
 250                 // Stop the loop after we found one file.
 251                 break;
 252             }
 253             if(closedir(dirp) == -1)
 254                 error("Unable to close dir %s", buffer);
 255         }
 256     }
 257
 258     // ------------------------------------------------------------------------
 259     // check if we can find its mount point
 260
 261     // mountinfo_find() can be called with NULL disk_mountinfo_root
 262     struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 263 /*    if(unlikely(!mi)) {
 264         mountinfo_reload(1);
 265
 266         // search again for this disk
 267         mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 268     }
 269 */
 270     if(mi) {
 271         d->mount_point = strdupz(mi->mount_point);
 272         d->mount_point_hash = mi->mount_point_hash;
 273     }
 274     else {
 275         d->mount_point = NULL;
 276         d->mount_point_hash = 0;
 277     }
 278
 279     // ------------------------------------------------------------------------
 280     // find the disk sector size
 281
 282     if(!path_to_get_hw_sector_size[0]) {
 283         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 284         snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", buffer));
 285     }
 286     if(!path_to_get_hw_sector_size_partitions[0]) {
 287         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 288         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));
 289     }
 290
 291     {
 292         char tf[FILENAME_MAX + 1], *t;
 293         strncpyz(tf, d->disk, FILENAME_MAX);
 294
 295         // replace all / with !
 296         for(t = tf; *t ;t++)
 297             if(*t == '/') *t = '!';
 298
 299         if(d->type == DISK_TYPE_PARTITION)
 300             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 301         else
 302             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 303
 304         FILE *fpss = fopen(buffer, "r");
 305         if(fpss) {
 306             char buffer2[1024 + 1];
 307             char *tmp = fgets(buffer2, 1024, fpss);
 308
 309             if(tmp) {
 310                 d->sector_size = atoi(tmp);
 311                 if(d->sector_size <= 0) {
 312                     error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 313                     d->sector_size = 512;
 314                 }
 315             }
 316             else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 317
 318             fclose(fpss);
 319         }
 320         else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 321     }
 322
 323     return d;
 324 }
 325
 326 static inline int select_positive_option(int option1, int option2) {
 327     if(option1 == CONFIG_ONDEMAND_YES || option2 == CONFIG_ONDEMAND_YES)
 328         return CONFIG_ONDEMAND_YES;
 329     else if(option1 == CONFIG_ONDEMAND_ONDEMAND || option2 == CONFIG_ONDEMAND_ONDEMAND)
 330         return CONFIG_ONDEMAND_ONDEMAND;
 331
 332     return CONFIG_ONDEMAND_NO;
 333 }
 334
 335 int do_proc_diskstats(int update_every, unsigned long long dt) {
 336     static procfile *ff = NULL;
 337     static int  global_enable_new_disks_detected_at_runtime = CONFIG_ONDEMAND_YES,
 338                 global_enable_performance_for_physical_disks = CONFIG_ONDEMAND_ONDEMAND,
 339                 global_enable_performance_for_virtual_disks = CONFIG_ONDEMAND_NO,
 340                 global_enable_performance_for_partitions = CONFIG_ONDEMAND_NO,
 341                 global_enable_performance_for_mountpoints = CONFIG_ONDEMAND_NO,
 342                 global_enable_performance_for_virtual_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 343                 global_enable_space_for_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 344                 global_do_io = CONFIG_ONDEMAND_ONDEMAND,
 345                 global_do_ops = CONFIG_ONDEMAND_ONDEMAND,
 346                 global_do_mops = CONFIG_ONDEMAND_ONDEMAND,
 347                 global_do_iotime = CONFIG_ONDEMAND_ONDEMAND,
 348                 global_do_qops = CONFIG_ONDEMAND_ONDEMAND,
 349                 global_do_util = CONFIG_ONDEMAND_ONDEMAND,
 350                 global_do_backlog = CONFIG_ONDEMAND_ONDEMAND,
 351                 global_do_space = CONFIG_ONDEMAND_ONDEMAND,
 352                 global_do_inodes = 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         global_enable_space_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space metrics for mounted filesystems", global_enable_space_for_mountpoints);
 364
 365         global_do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", global_do_io);
 366         global_do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", global_do_ops);
 367         global_do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", global_do_mops);
 368         global_do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", global_do_iotime);
 369         global_do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", global_do_qops);
 370         global_do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", global_do_util);
 371         global_do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", global_do_backlog);
 372         global_do_space   = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", global_do_space);
 373         global_do_inodes  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", global_do_inodes);
 374
 375         globals_initialized = 1;
 376     }
 377
 378     if(!ff) {
 379         char filename[FILENAME_MAX + 1];
 380         snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 381         ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 382     }
 383     if(!ff) return 1;
 384
 385     ff = procfile_readall(ff);
 386     if(!ff) return 0; // we return 0, so that we will retry to open it next time
 387
 388     uint32_t lines = procfile_lines(ff), l;
 389     uint32_t words;
 390
 391     // this is smart enough not to reload it every time
 392     mountinfo_reload(0);
 393
 394     for(l = 0; l < lines ;l++) {
 395         // --------------------------------------------------------------------------
 396         // Read parameters
 397
 398         char *disk;
 399         unsigned long       major = 0, minor = 0;
 400
 401         collected_number    reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 402                             writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 403                             queued_ios = 0, busy_ms = 0, backlog_ms = 0;
 404
 405         collected_number    last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 406                             last_writes = 0, last_writesectors = 0, last_writems = 0,
 407                             last_busy_ms = 0;
 408
 409         words = procfile_linewords(ff, l);
 410         if(words < 14) continue;
 411
 412         major           = strtoul(procfile_lineword(ff, l, 0), NULL, 10);
 413         minor           = strtoul(procfile_lineword(ff, l, 1), NULL, 10);
 414         disk            = procfile_lineword(ff, l, 2);
 415
 416         // # of reads completed # of writes completed
 417         // This is the total number of reads or writes completed successfully.
 418         reads           = strtoull(procfile_lineword(ff, l, 3), NULL, 10);  // rd_ios
 419         writes          = strtoull(procfile_lineword(ff, l, 7), NULL, 10);  // wr_ios
 420
 421         // # of reads merged # of writes merged
 422         // Reads and writes which are adjacent to each other may be merged for
 423         // efficiency.  Thus two 4K reads may become one 8K read before it is
 424         // ultimately handed to the disk, and so it will be counted (and queued)
 425         mreads          = strtoull(procfile_lineword(ff, l, 4), NULL, 10);  // rd_merges_or_rd_sec
 426         mwrites         = strtoull(procfile_lineword(ff, l, 8), NULL, 10);  // wr_merges
 427
 428         // # of sectors read # of sectors written
 429         // This is the total number of sectors read or written successfully.
 430         readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);  // rd_sec_or_wr_ios
 431         writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);  // wr_sec
 432
 433         // # of milliseconds spent reading # of milliseconds spent writing
 434         // This is the total number of milliseconds spent by all reads or writes (as
 435         // measured from __make_request() to end_that_request_last()).
 436         readms          = strtoull(procfile_lineword(ff, l, 6), NULL, 10);  // rd_ticks_or_wr_sec
 437         writems         = strtoull(procfile_lineword(ff, l, 10), NULL, 10); // wr_ticks
 438
 439         // # of I/Os currently in progress
 440         // The only field that should go to zero. Incremented as requests are
 441         // given to appropriate struct request_queue and decremented as they finish.
 442         queued_ios      = strtoull(procfile_lineword(ff, l, 11), NULL, 10); // ios_pgr
 443
 444         // # of milliseconds spent doing I/Os
 445         // This field increases so long as field queued_ios is nonzero.
 446         busy_ms         = strtoull(procfile_lineword(ff, l, 12), NULL, 10); // tot_ticks
 447
 448         // weighted # of milliseconds spent doing I/Os
 449         // This field is incremented at each I/O start, I/O completion, I/O
 450         // merge, or read of these stats by the number of I/Os in progress
 451         // (field queued_ios) times the number of milliseconds spent doing I/O since the
 452         // last update of this field.  This can provide an easy measure of both
 453         // I/O completion time and the backlog that may be accumulating.
 454         backlog_ms      = strtoull(procfile_lineword(ff, l, 13), NULL, 10); // rq_ticks
 455
 456
 457         // --------------------------------------------------------------------------
 458         // remove slashes from disk names
 459         char *s;
 460         for(s = disk; *s ;s++)
 461             if(*s == '/') *s = '_';
 462
 463         // --------------------------------------------------------------------------
 464         // get a disk structure for the disk
 465
 466         struct disk *d = get_disk(major, minor, disk);
 467
 468
 469         // --------------------------------------------------------------------------
 470         // Set its family based on mount point
 471
 472         char *family = d->mount_point;
 473         if(!family) family = disk;
 474
 475
 476         // --------------------------------------------------------------------------
 477         // Check the configuration for the device
 478
 479         if(unlikely(!d->configured)) {
 480             char var_name[4096 + 1];
 481             snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 482
 483             int def_enable = config_get_boolean_ondemand(var_name, "enable", global_enable_new_disks_detected_at_runtime);
 484             if(def_enable == CONFIG_ONDEMAND_NO) {
 485                 // the user does not want any metrics for this disk
 486                 d->do_io = CONFIG_ONDEMAND_NO;
 487                 d->do_ops = CONFIG_ONDEMAND_NO;
 488                 d->do_mops = CONFIG_ONDEMAND_NO;
 489                 d->do_iotime = CONFIG_ONDEMAND_NO;
 490                 d->do_qops = CONFIG_ONDEMAND_NO;
 491                 d->do_util = CONFIG_ONDEMAND_NO;
 492                 d->do_backlog = CONFIG_ONDEMAND_NO;
 493                 d->do_space = CONFIG_ONDEMAND_NO;
 494                 d->do_inodes = CONFIG_ONDEMAND_NO;
 495             }
 496             else {
 497                 // this disk is enabled
 498                 // check its direct settings
 499
 500                 int def_performance = CONFIG_ONDEMAND_ONDEMAND;
 501                 int def_space = (d->mount_point)?CONFIG_ONDEMAND_ONDEMAND:CONFIG_ONDEMAND_NO;
 502
 503                 // since this is 'on demand' we can figure the performance settings
 504                 // based on the type of disk
 505
 506                 switch(d->type) {
 507                     case DISK_TYPE_PHYSICAL:
 508                         def_performance = global_enable_performance_for_physical_disks;
 509                         break;
 510
 511                     case DISK_TYPE_PARTITION:
 512                         def_performance = global_enable_performance_for_partitions;
 513                         break;
 514
 515                     case DISK_TYPE_CONTAINER:
 516                         def_performance = global_enable_performance_for_virtual_disks;
 517
 518                         if(d->mount_point)
 519                             def_performance = select_positive_option(def_performance, global_enable_performance_for_virtual_mountpoints);
 520                         break;
 521                 }
 522
 523                 if(d->mount_point)
 524                     def_performance = select_positive_option(def_performance, global_enable_performance_for_mountpoints);
 525
 526                 // ------------------------------------------------------------
 527                 // now we have def_performance and def_space
 528                 // to work further
 529
 530                 // def_performance
 531                 // check the user configuration (this will also show our 'on demand' decision)
 532                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 533
 534                 int ddo_io = CONFIG_ONDEMAND_NO,
 535                     ddo_ops = CONFIG_ONDEMAND_NO,
 536                     ddo_mops = CONFIG_ONDEMAND_NO,
 537                     ddo_iotime = CONFIG_ONDEMAND_NO,
 538                     ddo_qops = CONFIG_ONDEMAND_NO,
 539                     ddo_util = CONFIG_ONDEMAND_NO,
 540                     ddo_backlog = CONFIG_ONDEMAND_NO;
 541
 542                 // we enable individual performance charts only when def_performance is not disabled
 543                 if(def_performance != CONFIG_ONDEMAND_NO) {
 544                     ddo_io = global_do_io,
 545                     ddo_ops = global_do_ops,
 546                     ddo_mops = global_do_mops,
 547                     ddo_iotime = global_do_iotime,
 548                     ddo_qops = global_do_qops,
 549                     ddo_util = global_do_util,
 550                     ddo_backlog = global_do_backlog;
 551                 }
 552
 553                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 554                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 555                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 556                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 557                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 558                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 559                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 560
 561                 // def_space
 562                 if(d->mount_point) {
 563                     // check the user configuration (this will also show our 'on demand' decision)
 564                     def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 565
 566                     int ddo_space = def_space,
 567                         ddo_inodes = def_space;
 568
 569                     d->do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 570                     d->do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 571                 }
 572                 else {
 573                     // don't show settings for this disk
 574                     d->do_space = CONFIG_ONDEMAND_NO;
 575                     d->do_inodes = CONFIG_ONDEMAND_NO;
 576                 }
 577             }
 578
 579             d->configured = 1;
 580         }
 581
 582         RRDSET *st;
 583
 584         // --------------------------------------------------------------------------
 585         // Do performance metrics
 586
 587         if(d->do_io == CONFIG_ONDEMAND_YES || (d->do_io == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) {
 588             d->do_io = CONFIG_ONDEMAND_YES;
 589
 590             st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 591             if(!st) {
 592                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 593
 594                 rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_INCREMENTAL);
 595                 rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 596             }
 597             else rrdset_next_usec(st, dt);
 598
 599             last_readsectors  = rrddim_set(st, "reads", readsectors);
 600             last_writesectors = rrddim_set(st, "writes", writesectors);
 601             rrdset_done(st);
 602         }
 603
 604         // --------------------------------------------------------------------
 605
 606         if(d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes))) {
 607             d->do_ops = CONFIG_ONDEMAND_YES;
 608
 609             st = rrdset_find_bytype("disk_ops", disk);
 610             if(!st) {
 611                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 612                 st->isdetail = 1;
 613
 614                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 615                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 616             }
 617             else rrdset_next_usec(st, dt);
 618
 619             last_reads  = rrddim_set(st, "reads", reads);
 620             last_writes = rrddim_set(st, "writes", writes);
 621             rrdset_done(st);
 622         }
 623
 624         // --------------------------------------------------------------------
 625
 626         if(d->do_qops == CONFIG_ONDEMAND_YES || (d->do_qops == CONFIG_ONDEMAND_ONDEMAND && queued_ios)) {
 627             d->do_qops = CONFIG_ONDEMAND_YES;
 628
 629             st = rrdset_find_bytype("disk_qops", disk);
 630             if(!st) {
 631                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 632                 st->isdetail = 1;
 633
 634                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 635             }
 636             else rrdset_next_usec(st, dt);
 637
 638             rrddim_set(st, "operations", queued_ios);
 639             rrdset_done(st);
 640         }
 641
 642         // --------------------------------------------------------------------
 643
 644         if(d->do_backlog == CONFIG_ONDEMAND_YES || (d->do_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms)) {
 645             d->do_backlog = CONFIG_ONDEMAND_YES;
 646
 647             st = rrdset_find_bytype("disk_backlog", disk);
 648             if(!st) {
 649                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 650                 st->isdetail = 1;
 651
 652                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 653             }
 654             else rrdset_next_usec(st, dt);
 655
 656             rrddim_set(st, "backlog", backlog_ms);
 657             rrdset_done(st);
 658         }
 659
 660         // --------------------------------------------------------------------
 661
 662         if(d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) {
 663             d->do_util = CONFIG_ONDEMAND_YES;
 664
 665             st = rrdset_find_bytype("disk_util", disk);
 666             if(!st) {
 667                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 668                 st->isdetail = 1;
 669
 670                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 671             }
 672             else rrdset_next_usec(st, dt);
 673
 674             last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 675             rrdset_done(st);
 676         }
 677
 678         // --------------------------------------------------------------------
 679
 680         if(d->do_mops == CONFIG_ONDEMAND_YES || (d->do_mops == CONFIG_ONDEMAND_ONDEMAND && (mreads || mwrites))) {
 681             d->do_mops = CONFIG_ONDEMAND_YES;
 682
 683             st = rrdset_find_bytype("disk_mops", disk);
 684             if(!st) {
 685                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 686                 st->isdetail = 1;
 687
 688                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 689                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 690             }
 691             else rrdset_next_usec(st, dt);
 692
 693             rrddim_set(st, "reads", mreads);
 694             rrddim_set(st, "writes", mwrites);
 695             rrdset_done(st);
 696         }
 697
 698         // --------------------------------------------------------------------
 699
 700         if(d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) {
 701             d->do_iotime = CONFIG_ONDEMAND_YES;
 702
 703             st = rrdset_find_bytype("disk_iotime", disk);
 704             if(!st) {
 705                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 706                 st->isdetail = 1;
 707
 708                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 709                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 710             }
 711             else rrdset_next_usec(st, dt);
 712
 713             last_readms  = rrddim_set(st, "reads", readms);
 714             last_writems = rrddim_set(st, "writes", writems);
 715             rrdset_done(st);
 716         }
 717
 718         // --------------------------------------------------------------------
 719         // calculate differential charts
 720         // only if this is not the first time we run
 721
 722         if(dt) {
 723             if( (d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) &&
 724                 (d->do_ops    == CONFIG_ONDEMAND_YES || (d->do_ops    == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 725                 st = rrdset_find_bytype("disk_await", disk);
 726                 if(!st) {
 727                     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);
 728                     st->isdetail = 1;
 729
 730                     rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 731                     rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 732                 }
 733                 else rrdset_next_usec(st, dt);
 734
 735                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 736                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 737                 rrdset_done(st);
 738             }
 739
 740             if( (d->do_io  == CONFIG_ONDEMAND_YES || (d->do_io  == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) &&
 741                 (d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 742                 st = rrdset_find_bytype("disk_avgsz", disk);
 743                 if(!st) {
 744                     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);
 745                     st->isdetail = 1;
 746
 747                     rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_ABSOLUTE);
 748                     rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_ABSOLUTE);
 749                 }
 750                 else rrdset_next_usec(st, dt);
 751
 752                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 753                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 754                 rrdset_done(st);
 755             }
 756
 757             if( (d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) &&
 758                 (d->do_ops  == CONFIG_ONDEMAND_YES || (d->do_ops  == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 759                 st = rrdset_find_bytype("disk_svctm", disk);
 760                 if(!st) {
 761                     st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 762                     st->isdetail = 1;
 763
 764                     rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 765                 }
 766                 else rrdset_next_usec(st, dt);
 767
 768                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 769                 rrdset_done(st);
 770             }
 771         }
 772
 773 /*
 774         // --------------------------------------------------------------------------
 775         // space metrics
 776
 777         if(d->mount_point && (d->do_space || d->do_inodes) ) {
 778             do_disk_space_stats(d, d->mount_point, disk, disk, family, update_every, dt);
 779         }
 780 */
 781     }
 782
 783     // --------------------------------------------------------------------------
 784     // space metrics for non-block devices
 785
 786     struct mountinfo *mi;
 787     for(mi = disk_mountinfo_root; mi ;mi = mi->next) {
 788         if(unlikely(mi->flags & (MOUNTINFO_IS_DUMMY|MOUNTINFO_IS_BIND|MOUNTINFO_IS_SAME_DEV|MOUNTINFO_NO_STAT|MOUNTINFO_NO_SIZE)))
 789             continue;
 790
 791 /*
 792         // skip the ones with block devices
 793         int skip = 0;
 794         struct disk *d;
 795         for(d = disk_root; d ;d = d->next) {
 796             if(unlikely(d->mount_point && mi->mount_point_hash == d->mount_point_hash && strcmp(mi->mount_point, d->mount_point))) {
 797                 skip = 1;
 798                 break;
 799             }
 800         }
 801
 802         if(unlikely(skip))
 803             continue;
 804
 805         // fprintf(stderr, "Will process mount point '%s', source '%s', filesystem '%s'\n", mi->mount_point, mi->mount_source, mi->filesystem);
 806 */
 807
 808         do_disk_space_stats(NULL, mi->mount_point, mi->mount_source, mi->persistent_id, mi->mount_point , update_every, dt);
 809     }
 810
 811     return 0;
 812 }