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