src/proc_diskstats.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <dirent.h>
   5 #include <fcntl.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <sys/stat.h>
  10 #include <sys/statvfs.h>
  11 #include <sys/types.h>
  12 #include <unistd.h>
  13
  14
  15 #include "common.h"
  16 #include "log.h"
  17 #include "appconfig.h"
  18 #include "procfile.h"
  19 #include "rrd.h"
  20 #include "plugin_proc.h"
  21
  22 #include "proc_self_mountinfo.h"
  23
  24 #define RRD_TYPE_DISK "disk"
  25
  26 #define DISK_TYPE_PHYSICAL  1
  27 #define DISK_TYPE_PARTITION 2
  28 #define DISK_TYPE_CONTAINER 3
  29
  30 struct disk {
  31         unsigned long major;
  32         unsigned long minor;
  33         int type;
  34         char *mount_point;
  35         struct disk *next;
  36 } *disk_root = NULL;
  37
  38 struct disk *get_disk(unsigned long major, unsigned long minor) {
  39         static char path_find_block_device[FILENAME_MAX + 1] = "";
  40         static struct mountinfo *mountinfo_root = NULL;
  41         struct disk *d;
  42
  43         // search for it in our RAM list.
  44         // this is sequential, but since we just walk through
  45         // and the number of disks / partitions in a system
  46         // should not be that many, it should be acceptable
  47         for(d = disk_root; d ; d = d->next)
  48                 if(unlikely(d->major == major && d->minor == minor))
  49                         break;
  50
  51         // if we found it, return it
  52         if(likely(d))
  53                 return d;
  54
  55         if(unlikely(!path_find_block_device[0])) {
  56                 char dirname[FILENAME_MAX + 1];
  57                 snprintfz(dirname, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
  58                 snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", dirname));
  59         }
  60
  61         // not found
  62         // create a new disk structure
  63         d = (struct disk *)malloc(sizeof(struct disk));
  64         if(!d) fatal("Cannot allocate memory for struct disk in proc_diskstats.");
  65
  66         d->major = major;
  67         d->minor = minor;
  68         d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
  69         d->next = NULL;
  70
  71         // append it to the list
  72         if(!disk_root)
  73                 disk_root = d;
  74         else {
  75                 struct disk *last;
  76                 for(last = disk_root; last->next ;last = last->next);
  77                 last->next = d;
  78         }
  79
  80         // ------------------------------------------------------------------------
  81         // find the type of the device
  82
  83         // find if it is a partition
  84         // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
  85         char buffer[FILENAME_MAX + 1];
  86         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
  87         if(access(buffer, R_OK) == 0) {
  88                 d->type = DISK_TYPE_PARTITION;
  89         } else {
  90                 // find if it is a container
  91                 // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
  92                 int is_container = 0;
  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                                 d->type = DISK_TYPE_CONTAINER;
 103                                 // Stop the loop after we found one file.
 104                                 break;
 105                         }
 106                         if(closedir(dirp) == -1)
 107                                 error("Unable to close dir %s", buffer);
 108                 }
 109         }
 110
 111         // ------------------------------------------------------------------------
 112         // check if we can find its mount point
 113
 114         // mountinfo_find() can be called with NULL mountinfo_root
 115         struct mountinfo *mi = mountinfo_find(mountinfo_root, d->major, d->minor);
 116         if(unlikely(!mi)) {
 117                 // mountinfo_free() can be called with NULL mountinfo_root
 118                 mountinfo_free(mountinfo_root);
 119
 120                 // re-read mountinfo in case something changed
 121                 mountinfo_root = mountinfo_read();
 122
 123                 // search again for this disk
 124                 mi = mountinfo_find(mountinfo_root, d->major, d->minor);
 125         }
 126
 127         if(mi)
 128                 d->mount_point = strdup(mi->mount_point);
 129                 // no need to check for NULL
 130         else
 131                 d->mount_point = NULL;
 132
 133         return d;
 134 }
 135
 136 int do_proc_diskstats(int update_every, unsigned long long dt) {
 137         static procfile *ff = NULL;
 138         static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 139         static int enable_new_disks = -1;
 140         static int do_io = -1, do_ops = -1, do_mops = -1, do_iotime = -1, do_qops = -1, do_util = -1, do_backlog = -1, do_space = -1;
 141         static struct statvfs buff_statvfs;
 142         static struct stat buff_stat;
 143
 144         if(enable_new_disks == -1)      enable_new_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", CONFIG_ONDEMAND_ONDEMAND);
 145
 146         if(do_io == -1)         do_io           = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", CONFIG_ONDEMAND_ONDEMAND);
 147         if(do_ops == -1)        do_ops          = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 148         if(do_mops == -1)       do_mops         = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 149         if(do_iotime == -1)     do_iotime       = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", CONFIG_ONDEMAND_ONDEMAND);
 150         if(do_qops == -1)       do_qops         = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", CONFIG_ONDEMAND_ONDEMAND);
 151         if(do_util == -1)       do_util         = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 152         if(do_backlog == -1)do_backlog  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", CONFIG_ONDEMAND_ONDEMAND);
 153         if(do_space == -1)  do_space    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
 154
 155         if(!ff) {
 156                 char filename[FILENAME_MAX + 1];
 157                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 158                 ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 159         }
 160         if(!ff) return 1;
 161
 162         if(!path_to_get_hw_sector_size[0]) {
 163                 char filename[FILENAME_MAX + 1];
 164                 snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 165                 snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", filename));
 166         }
 167
 168         ff = procfile_readall(ff);
 169         if(!ff) return 0; // we return 0, so that we will retry to open it next time
 170
 171         uint32_t lines = procfile_lines(ff), l;
 172         uint32_t words;
 173
 174         for(l = 0; l < lines ;l++) {
 175                 char *disk;
 176                 unsigned long long      major = 0, minor = 0,
 177                                                         reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 178                                                         writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 179                                                         queued_ios = 0, busy_ms = 0, backlog_ms = 0,
 180                                                         space_avail = 0, space_avail_root = 0, space_used = 0;
 181
 182                 unsigned long long      last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 183                                                         last_writes = 0, last_writesectors = 0, last_writems = 0,
 184                                                         last_busy_ms = 0;
 185
 186                 words = procfile_linewords(ff, l);
 187                 if(words < 14) continue;
 188
 189                 major                   = strtoull(procfile_lineword(ff, l, 0), NULL, 10);
 190                 minor                   = strtoull(procfile_lineword(ff, l, 1), NULL, 10);
 191                 disk                    = procfile_lineword(ff, l, 2);
 192
 193                 // # of reads completed # of writes completed
 194                 // This is the total number of reads or writes completed successfully.
 195                 reads                   = strtoull(procfile_lineword(ff, l, 3), NULL, 10);      // rd_ios
 196                 writes                  = strtoull(procfile_lineword(ff, l, 7), NULL, 10);      // wr_ios
 197
 198                 // # of reads merged # of writes merged
 199                 // Reads and writes which are adjacent to each other may be merged for
 200             // efficiency.  Thus two 4K reads may become one 8K read before it is
 201             // ultimately handed to the disk, and so it will be counted (and queued)
 202                 mreads                  = strtoull(procfile_lineword(ff, l, 4), NULL, 10);      // rd_merges_or_rd_sec
 203                 mwrites                 = strtoull(procfile_lineword(ff, l, 8), NULL, 10);      // wr_merges
 204
 205                 // # of sectors read # of sectors written
 206                 // This is the total number of sectors read or written successfully.
 207                 readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);      // rd_sec_or_wr_ios
 208                 writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);      // wr_sec
 209
 210                 // # of milliseconds spent reading # of milliseconds spent writing
 211                 // This is the total number of milliseconds spent by all reads or writes (as
 212                 // measured from __make_request() to end_that_request_last()).
 213                 readms                  = strtoull(procfile_lineword(ff, l, 6), NULL, 10);      // rd_ticks_or_wr_sec
 214                 writems                 = strtoull(procfile_lineword(ff, l, 10), NULL, 10);     // wr_ticks
 215
 216                 // # of I/Os currently in progress
 217                 // The only field that should go to zero. Incremented as requests are
 218                 // given to appropriate struct request_queue and decremented as they finish.
 219                 queued_ios              = strtoull(procfile_lineword(ff, l, 11), NULL, 10);     // ios_pgr
 220
 221                 // # of milliseconds spent doing I/Os
 222                 // This field increases so long as field queued_ios is nonzero.
 223                 busy_ms                 = strtoull(procfile_lineword(ff, l, 12), NULL, 10);     // tot_ticks
 224
 225                 // weighted # of milliseconds spent doing I/Os
 226                 // This field is incremented at each I/O start, I/O completion, I/O
 227                 // merge, or read of these stats by the number of I/Os in progress
 228                 // (field queued_ios) times the number of milliseconds spent doing I/O since the
 229                 // last update of this field.  This can provide an easy measure of both
 230                 // I/O completion time and the backlog that may be accumulating.
 231                 backlog_ms              = strtoull(procfile_lineword(ff, l, 13), NULL, 10);     // rq_ticks
 232
 233                 int def_enabled = 0;
 234
 235                 // remove slashes from disk names
 236                 char *s;
 237                 for(s = disk; *s ;s++) if(*s == '/') *s = '_';
 238
 239                 struct disk *d = get_disk(major, minor);
 240
 241                 // Enable statistics for physical disks and mount points by default.
 242                 if( (d->type == DISK_TYPE_PHYSICAL) || (d->mount_point != NULL) ) {
 243                         def_enabled = enable_new_disks;
 244                 }
 245
 246                 /*
 247                 // Enable physical disks by default.
 248                 // To fine out if it is a harddrive we use
 249                 // Linux Assigned Names and Numbers Authority (http://www.lanana.org/)
 250                 // We can't do that because proprietary disk drivers do not stick to
 251                 // the standard. To detect re
 252                 switch(major) {
 253                         case 8: // SCSI disk devices (0-15)
 254                                 if(!(minor % 16)) {
 255                                         def_enabled = enable_new_disks;
 256                                 }
 257                                 break;
 258                         case 21: // Acorn MFM hard drive interface
 259                                 if(!(minor % 64)) {
 260                                         def_enabled = enable_new_disks;
 261                                 }
 262                                 break;
 263                         case 28: // ACSI disk (68k/Atari)
 264                                 if(!(minor % 16)) {
 265                                         def_enabled = enable_new_disks;
 266                                 }
 267                                 break;
 268                         case 36: // MCA ESDI hard disk
 269                                 if(!(minor % 64)) {
 270                                         def_enabled = enable_new_disks;
 271                                 }
 272                                 break;
 273                         case 48: // Mylex DAC960 PCI RAID controller; first controller
 274                                 if(!(minor % 8)) {
 275                                         def_enabled = enable_new_disks;
 276                                 }
 277                                 break;
 278                         case 49: // Mylex DAC960 PCI RAID controller; second controller
 279                                 if(!(minor % 8)) {
 280                                         def_enabled = enable_new_disks;
 281                                 }
 282                                 break;
 283                         case 50: // Mylex DAC960 PCI RAID controller; third controller
 284                                 if(!(minor % 8)) {
 285                                         def_enabled = enable_new_disks;
 286                                 }
 287                                 break;
 288                         case 51: // Mylex DAC960 PCI RAID controller; fourth controller
 289                                 if(!(minor % 8)) {
 290                                         def_enabled = enable_new_disks;
 291                                 }
 292                                 break;
 293                         case 52: // Mylex DAC960 PCI RAID controller; fifth controller
 294                                 if(!(minor % 8)) {
 295                                         def_enabled = enable_new_disks;
 296                                 }
 297                                 break;
 298                         case 53: // Mylex DAC960 PCI RAID controller; sixth controller
 299                                 if(!(minor % 8)) {
 300                                         def_enabled = enable_new_disks;
 301                                 }
 302                                 break;
 303                         case 54: // Mylex DAC960 PCI RAID controller; seventh controller
 304                                 if(!(minor % 8)) {
 305                                         def_enabled = enable_new_disks;
 306                                 }
 307                                 break;
 308                         case 55: // Mylex DAC960 PCI RAID controller; eigth controller
 309                                 if(!(minor % 8)) {
 310                                         def_enabled = enable_new_disks;
 311                                 }
 312                                 break;
 313                         case 65: // SCSI disk devices (16-31)
 314                                 if(!(minor % 16)) {
 315                                         def_enabled = enable_new_disks;
 316                                 }
 317                                 break;
 318                         case 66: // SCSI disk devices (32-47)
 319                                 if(!(minor % 16)) {
 320                                         def_enabled = enable_new_disks;
 321                                 }
 322                                 break;
 323                         case 67: // SCSI disk devices (48-63)
 324                                 if(!(minor % 16)) {
 325                                         def_enabled = enable_new_disks;
 326                                 }
 327                                 break;
 328                         case 68: // SCSI disk devices (64-79)
 329                                 if(!(minor % 16)) {
 330                                         def_enabled = enable_new_disks;
 331                                 }
 332                                 break;
 333                         case 69: // SCSI disk devices (80-95)
 334                                 if(!(minor % 16)) {
 335                                         def_enabled = enable_new_disks;
 336                                 }
 337                                 break;
 338                         case 70: // SCSI disk devices (96-111)
 339                                 if(!(minor % 16)) {
 340                                         def_enabled = enable_new_disks;
 341                                 }
 342                                 break;
 343                         case 71: // SCSI disk devices (112-127)
 344                                 if(!(minor % 16)) {
 345                                         def_enabled = enable_new_disks;
 346                                 }
 347                                 break;
 348                         case 80: // I2O hard disk
 349                                 if(!(minor % 16)) {
 350                                         def_enabled = enable_new_disks;
 351                                 }
 352                                 break;
 353                         case 81: // I2O hard disk
 354                                 if(!(minor % 16)) {
 355                                         def_enabled = enable_new_disks;
 356                                 }
 357                                 break;
 358                         case 82: // I2O hard disk
 359                                 if(!(minor % 16)) {
 360                                         def_enabled = enable_new_disks;
 361                                 }
 362                                 break;
 363                         case 83: // I2O hard disk
 364                                 if(!(minor % 16)) {
 365                                         def_enabled = enable_new_disks;
 366                                 }
 367                                 break;
 368                         case 84: // I2O hard disk
 369                                 if(!(minor % 16)) {
 370                                         def_enabled = enable_new_disks;
 371                                 }
 372                                 break;
 373                         case 85: // I2O hard disk
 374                                 if(!(minor % 16)) {
 375                                         def_enabled = enable_new_disks;
 376                                 }
 377                                 break;
 378                         case 86: // I2O hard disk
 379                                 if(!(minor % 16)) {
 380                                         def_enabled = enable_new_disks;
 381                                 }
 382                                 break;
 383                         case 87: // I2O hard disk
 384                                 if(!(minor % 16)) {
 385                                         def_enabled = enable_new_disks;
 386                                 }
 387                                 break;
 388                         case 128: // SCSI disk devices (128-143)
 389                                 if(!(minor % 16)) {
 390                                         def_enabled = enable_new_disks;
 391                                 }
 392                                 break;
 393                         case 129: // SCSI disk devices (144-159)
 394                                 if(!(minor % 16)) {
 395                                         def_enabled = enable_new_disks;
 396                                 }
 397                                 break;
 398                         case 130: // SCSI disk devices (160-175)
 399                                 if(!(minor % 16)) {
 400                                         def_enabled = enable_new_disks;
 401                                 }
 402                                 break;
 403                         case 131: // SCSI disk devices (176-191)
 404                                 if(!(minor % 16)) {
 405                                         def_enabled = enable_new_disks;
 406                                 }
 407                                 break;
 408                         case 132: // SCSI disk devices (192-207)
 409                                 if(!(minor % 16)) {
 410                                         def_enabled = enable_new_disks;
 411                                 }
 412                                 break;
 413                         case 133: // SCSI disk devices (208-223)
 414                                 if(!(minor % 16)) {
 415                                         def_enabled = enable_new_disks;
 416                                 }
 417                                 break;
 418                         case 134: // SCSI disk devices (224-239)
 419                                 if(!(minor % 16)) {
 420                                         def_enabled = enable_new_disks;
 421                                 }
 422                                 break;
 423                         case 135: // SCSI disk devices (240-255)
 424                                 if(!(minor % 16)) {
 425                                         def_enabled = enable_new_disks;
 426                                 }
 427                                 break;
 428                         case 136: // Mylex DAC960 PCI RAID controller; nineth controller
 429                                 if(!(minor % 8)) {
 430                                         def_enabled = enable_new_disks;
 431                                 }
 432                                 break;
 433                         case 137: // Mylex DAC960 PCI RAID controller; tenth controller
 434                                 if(!(minor % 8)) {
 435                                         def_enabled = enable_new_disks;
 436                                 }
 437                                 break;
 438                         case 138: // Mylex DAC960 PCI RAID controller; eleventh controller
 439                                 if(!(minor % 8)) {
 440                                         def_enabled = enable_new_disks;
 441                                 }
 442                                 break;
 443                         case 139: // Mylex DAC960 PCI RAID controller; twelfth controller
 444                                 if(!(minor % 8)) {
 445                                         def_enabled = enable_new_disks;
 446                                 }
 447                                 break;
 448                         case 140: // Mylex DAC960 PCI RAID controller; thirteenth controller
 449                                 if(!(minor % 8)) {
 450                                         def_enabled = enable_new_disks;
 451                                 }
 452                                 break;
 453                         case 141: // Mylex DAC960 PCI RAID controller; fourteenth controller
 454                                 if(!(minor % 8)) {
 455                                         def_enabled = enable_new_disks;
 456                                 }
 457                                 break;
 458                         case 142: // Mylex DAC960 PCI RAID controller; fifteenth controller
 459                                 if(!(minor % 8)) {
 460                                         def_enabled = enable_new_disks;
 461                                 }
 462                                 break;
 463                         case 143: // Mylex DAC960 PCI RAID controller; sixteenth controller
 464                                 if(!(minor % 8)) {
 465                                         def_enabled = enable_new_disks;
 466                                 }
 467                                 break;
 468                         case 160: // Carmel 8-port SATA Disks on First Controller
 469                                 if(!(minor % 32)) {
 470                                         def_enabled = enable_new_disks;
 471                                 }
 472                                 break;
 473                         case 161: // Carmel 8-port SATA Disks on Second Controller
 474                                 if(!(minor % 32)) {
 475                                         def_enabled = enable_new_disks;
 476                                 }
 477                                 break;
 478                         default:
 479                                 def_enabled = 0;
 480                                 break;
 481                 }
 482                 */
 483
 484                 char *mount_point = d->mount_point;
 485                 char *family = d->mount_point;
 486                 if(!family) family = disk;
 487
 488                 int ddo_io = do_io, ddo_ops = do_ops, ddo_mops = do_mops, ddo_iotime = do_iotime, ddo_qops = do_qops, ddo_util = do_util, ddo_backlog = do_backlog, ddo_space = do_space;
 489
 490                 // check which charts are enabled for this disk
 491                 {
 492                         char var_name[4096 + 1];
 493                         snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 494                         def_enabled = config_get_boolean_ondemand(var_name, "enabled", def_enabled);
 495                         if(def_enabled == CONFIG_ONDEMAND_NO) continue;
 496                         if(def_enabled == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) continue;
 497
 498
 499                         ddo_io          = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 500                         ddo_ops         = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 501                         ddo_mops        = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 502                         ddo_iotime      = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 503                         ddo_qops        = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 504                         ddo_util        = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 505                         ddo_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 506                         ddo_space   = config_get_boolean_ondemand(var_name, "space", ddo_space);
 507
 508                         // by default, do not add charts that do not have values
 509                         if(ddo_io == CONFIG_ONDEMAND_ONDEMAND && !reads && !writes) ddo_io = 0;
 510                         if(ddo_mops == CONFIG_ONDEMAND_ONDEMAND && mreads == 0 && mwrites == 0) ddo_mops = 0;
 511                         if(ddo_iotime == CONFIG_ONDEMAND_ONDEMAND && readms == 0 && writems == 0) ddo_iotime = 0;
 512                         if(ddo_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms == 0) ddo_util = 0;
 513                         if(ddo_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_backlog = 0;
 514                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND && backlog_ms == 0) ddo_qops = 0;
 515
 516                         // for absolute values, we need to switch the setting to 'yes'
 517                         // to allow it refresh from now on
 518                         if(ddo_qops == CONFIG_ONDEMAND_ONDEMAND) config_set(var_name, "queued operations", "yes");
 519                 }
 520
 521                 RRDSET *st;
 522
 523                 // --------------------------------------------------------------------
 524
 525                 int sector_size = 512;
 526                 if(ddo_io) {
 527                         st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 528                         if(!st) {
 529                                 char tf[FILENAME_MAX + 1], *t;
 530                                 char ssfilename[FILENAME_MAX + 1];
 531
 532                                 strncpyz(tf, disk, FILENAME_MAX);
 533
 534                                 // replace all / with !
 535                                 while((t = strchr(tf, '/'))) *t = '!';
 536
 537                                 snprintfz(ssfilename, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 538                                 FILE *fpss = fopen(ssfilename, "r");
 539                                 if(fpss) {
 540                                         char ssbuffer[1025];
 541                                         char *tmp = fgets(ssbuffer, 1024, fpss);
 542
 543                                         if(tmp) {
 544                                                 sector_size = atoi(tmp);
 545                                                 if(sector_size <= 0) {
 546                                                         error("Invalid sector size %d for device %s in %s. Assuming 512.", sector_size, disk, ssfilename);
 547                                                         sector_size = 512;
 548                                                 }
 549                                         }
 550                                         else error("Cannot read data for sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 551
 552                                         fclose(fpss);
 553                                 }
 554                                 else error("Cannot read sector size for device %s from %s. Assuming 512.", disk, ssfilename);
 555
 556                                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 557
 558                                 rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_INCREMENTAL);
 559                                 rrddim_add(st, "writes", NULL, sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 560                         }
 561                         else rrdset_next_usec(st, dt);
 562
 563                         last_readsectors  = rrddim_set(st, "reads", readsectors);
 564                         last_writesectors = rrddim_set(st, "writes", writesectors);
 565                         rrdset_done(st);
 566                 }
 567
 568                 // --------------------------------------------------------------------
 569
 570                 if(ddo_ops) {
 571                         st = rrdset_find_bytype("disk_ops", disk);
 572                         if(!st) {
 573                                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 574                                 st->isdetail = 1;
 575
 576                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 577                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 578                         }
 579                         else rrdset_next_usec(st, dt);
 580
 581                         last_reads  = rrddim_set(st, "reads", reads);
 582                         last_writes = rrddim_set(st, "writes", writes);
 583                         rrdset_done(st);
 584                 }
 585
 586                 // --------------------------------------------------------------------
 587
 588                 if(ddo_qops) {
 589                         st = rrdset_find_bytype("disk_qops", disk);
 590                         if(!st) {
 591                                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 592                                 st->isdetail = 1;
 593
 594                                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 595                         }
 596                         else rrdset_next_usec(st, dt);
 597
 598                         rrddim_set(st, "operations", queued_ios);
 599                         rrdset_done(st);
 600                 }
 601
 602                 // --------------------------------------------------------------------
 603
 604                 if(ddo_backlog) {
 605                         st = rrdset_find_bytype("disk_backlog", disk);
 606                         if(!st) {
 607                                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 608                                 st->isdetail = 1;
 609
 610                                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 611                         }
 612                         else rrdset_next_usec(st, dt);
 613
 614                         rrddim_set(st, "backlog", backlog_ms);
 615                         rrdset_done(st);
 616                 }
 617
 618                 // --------------------------------------------------------------------
 619
 620                 if(ddo_util) {
 621                         st = rrdset_find_bytype("disk_util", disk);
 622                         if(!st) {
 623                                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 624                                 st->isdetail = 1;
 625
 626                                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 627                         }
 628                         else rrdset_next_usec(st, dt);
 629
 630                         last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 631                         rrdset_done(st);
 632                 }
 633
 634                 // --------------------------------------------------------------------
 635
 636                 if(ddo_mops) {
 637                         st = rrdset_find_bytype("disk_mops", disk);
 638                         if(!st) {
 639                                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 640                                 st->isdetail = 1;
 641
 642                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 643                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 644                         }
 645                         else rrdset_next_usec(st, dt);
 646
 647                         rrddim_set(st, "reads", mreads);
 648                         rrddim_set(st, "writes", mwrites);
 649                         rrdset_done(st);
 650                 }
 651
 652                 // --------------------------------------------------------------------
 653
 654                 if(ddo_iotime) {
 655                         st = rrdset_find_bytype("disk_iotime", disk);
 656                         if(!st) {
 657                                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 658                                 st->isdetail = 1;
 659
 660                                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 661                                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 662                         }
 663                         else rrdset_next_usec(st, dt);
 664
 665                         last_readms  = rrddim_set(st, "reads", readms);
 666                         last_writems = rrddim_set(st, "writes", writems);
 667                         rrdset_done(st);
 668                 }
 669
 670                 // --------------------------------------------------------------------
 671
 672                 if(ddo_space && mount_point) {
 673                         // collect space metrics using statvfs
 674                         if (statvfs(mount_point, &buff_statvfs) < 0) {
 675                                 error("Failed checking disk space usage of %s", family);
 676                         } else {
 677                                 // verify we collected the metrics for the right disk.
 678                                 // if not the mountpoint has changed.
 679                                 if(stat(mount_point, &buff_stat) == -1) {
 680                                 } else {
 681                                         if(major(buff_stat.st_dev) == major && minor(buff_stat.st_dev) == minor)
 682                                         {
 683                                                 space_avail = buff_statvfs.f_bavail * buff_statvfs.f_bsize;
 684                                                 space_avail_root = (buff_statvfs.f_bfree - buff_statvfs.f_bavail) * buff_statvfs.f_bsize;
 685                                                 space_used = (buff_statvfs.f_blocks - buff_statvfs.f_bfree) * buff_statvfs.f_bsize;
 686
 687                                                 st = rrdset_find_bytype("disk_space", disk);
 688                                                 if(!st) {
 689                                                         st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 690                                                         st->isdetail = 1;
 691
 692                                                         rrddim_add(st, "avail", NULL, 1, 1000*1000*1000, RRDDIM_ABSOLUTE);
 693                                                         rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1000*1000*1000, RRDDIM_ABSOLUTE);
 694                                                         rrddim_add(st, "used" , NULL, 1, 1000*1000*1000, RRDDIM_ABSOLUTE);
 695                                                 }
 696                                                 else rrdset_next_usec(st, dt);
 697
 698                                                 rrddim_set(st, "avail", space_avail);
 699                                                 rrddim_set(st, "reserved_for_root", space_avail_root);
 700                                                 rrddim_set(st, "used", space_used);
 701                                                 rrdset_done(st);
 702                                         }
 703                                 }
 704                         }
 705                 }
 706
 707                 // --------------------------------------------------------------------
 708                 // calculate differential charts
 709                 // only if this is not the first time we run
 710
 711                 if(dt) {
 712                         if(ddo_iotime && ddo_ops) {
 713                                 st = rrdset_find_bytype("disk_await", disk);
 714                                 if(!st) {
 715                                         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);
 716                                         st->isdetail = 1;
 717
 718                                         rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 719                                         rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 720                                 }
 721                                 else rrdset_next_usec(st, dt);
 722
 723                                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 724                                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 725                                 rrdset_done(st);
 726                         }
 727
 728                         if(ddo_io && ddo_ops) {
 729                                 st = rrdset_find_bytype("disk_avgsz", disk);
 730                                 if(!st) {
 731                                         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);
 732                                         st->isdetail = 1;
 733
 734                                         rrddim_add(st, "reads", NULL, sector_size, 1024, RRDDIM_ABSOLUTE);
 735                                         rrddim_add(st, "writes", NULL, -sector_size, 1024, RRDDIM_ABSOLUTE);
 736                                 }
 737                                 else rrdset_next_usec(st, dt);
 738
 739                                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 740                                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 741                                 rrdset_done(st);
 742                         }
 743
 744                         if(ddo_util && ddo_ops) {
 745                                 st = rrdset_find_bytype("disk_svctm", disk);
 746                                 if(!st) {
 747                                         st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 748                                         st->isdetail = 1;
 749
 750                                         rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 751                                 }
 752                                 else rrdset_next_usec(st, dt);
 753
 754                                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 755                                 rrdset_done(st);
 756                         }
 757                 }
 758         }
 759
 760         return 0;
 761 }