src/plugin_proc_diskspace.c

   1 #include "common.h"
   2
   3 #define DELAULT_EXLUDED_PATHS "/proc/ /sys/ /var/run/user/ /run/user/"
   4
   5 static struct mountinfo *disk_mountinfo_root = NULL;
   6 static int check_for_new_mountpoints_every = 15;
   7
   8 static inline void mountinfo_reload(int force) {
   9     static time_t last_loaded = 0;
  10     time_t now = now_realtime_sec();
  11
  12     if(force || now - last_loaded >= check_for_new_mountpoints_every) {
  13         // mountinfo_free() can be called with NULL disk_mountinfo_root
  14         mountinfo_free(disk_mountinfo_root);
  15
  16         // re-read mountinfo in case something changed
  17         disk_mountinfo_root = mountinfo_read(1);
  18
  19         last_loaded = now;
  20     }
  21 }
  22
  23 // Data to be stored in DICTIONARY mount_points used by do_disk_space_stats().
  24 // This DICTIONARY is used to lookup the settings of the mount point on each iteration.
  25 struct mount_point_metadata {
  26     int do_space;
  27     int do_inodes;
  28 };
  29
  30 static inline void do_disk_space_stats(struct mountinfo *mi, int update_every) {
  31     const char *family = mi->mount_point;
  32     const char *disk = mi->persistent_id;
  33
  34     static DICTIONARY *mount_points = NULL;
  35     static NETDATA_SIMPLE_PATTERN *excluded_mountpoints = NULL;
  36     int do_space, do_inodes;
  37
  38     if(unlikely(!mount_points)) {
  39         const char *s;
  40
  41         if(config_exists("plugin:proc:/proc/diskstats", "exclude space metrics on paths") && !config_exists("plugin:proc:diskspace", "exclude space metrics on paths")) {
  42             // the config exists in the old section
  43             s = config_get("plugin:proc:/proc/diskstats", "exclude space metrics on paths", DELAULT_EXLUDED_PATHS);
  44
  45             // set it to the new section
  46             config_set("plugin:proc:diskspace", "exclude space metrics on paths", s);
  47         }
  48         else
  49             s = config_get("plugin:proc:diskspace", "exclude space metrics on paths", DELAULT_EXLUDED_PATHS);
  50
  51         mount_points = dictionary_create(DICTIONARY_FLAG_SINGLE_THREADED);
  52         excluded_mountpoints = netdata_simple_pattern_list_create(s, NETDATA_SIMPLE_PATTERN_MODE_PREFIX);
  53     }
  54
  55     struct mount_point_metadata *m = dictionary_get(mount_points, mi->mount_point);
  56     if(unlikely(!m)) {
  57         char var_name[4096 + 1];
  58         snprintfz(var_name, 4096, "plugin:proc:diskspace:%s", mi->mount_point);
  59
  60         int def_space = config_get_boolean_ondemand("plugin:proc:diskspace", "space usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
  61         int def_inodes = config_get_boolean_ondemand("plugin:proc:diskspace", "inodes usage for all disks", CONFIG_ONDEMAND_ONDEMAND);
  62
  63         if(unlikely(netdata_simple_pattern_list_matches(excluded_mountpoints, mi->mount_point))) {
  64             def_space = CONFIG_ONDEMAND_NO;
  65             def_inodes = CONFIG_ONDEMAND_NO;
  66         }
  67
  68         do_space = config_get_boolean_ondemand(var_name, "space usage", def_space);
  69         do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", def_inodes);
  70
  71         struct mount_point_metadata mp = {
  72                 .do_space = do_space,
  73                 .do_inodes = do_inodes
  74         };
  75
  76         dictionary_set(mount_points, mi->mount_point, &mp, sizeof(struct mount_point_metadata));
  77     }
  78     else {
  79         do_space = m->do_space;
  80         do_inodes = m->do_inodes;
  81     }
  82
  83     if(unlikely(do_space == CONFIG_ONDEMAND_NO && do_inodes == CONFIG_ONDEMAND_NO))
  84         return;
  85
  86     struct statvfs buff_statvfs;
  87     if (statvfs(mi->mount_point, &buff_statvfs) < 0) {
  88         error("Failed statvfs() for '%s' (disk '%s')", mi->mount_point, disk);
  89         return;
  90     }
  91
  92     // taken from get_fs_usage() found in coreutils
  93     unsigned long bsize = (buff_statvfs.f_frsize) ? buff_statvfs.f_frsize : buff_statvfs.f_bsize;
  94
  95     fsblkcnt_t bavail         = buff_statvfs.f_bavail;
  96     fsblkcnt_t btotal         = buff_statvfs.f_blocks;
  97     fsblkcnt_t bavail_root    = buff_statvfs.f_bfree;
  98     fsblkcnt_t breserved_root = bavail_root - bavail;
  99     fsblkcnt_t bused;
 100     if(likely(btotal >= bavail_root))
 101         bused = btotal - bavail_root;
 102     else
 103         bused = bavail_root - btotal;
 104
 105 #ifdef NETDATA_INTERNAL_CHECKS
 106     if(unlikely(btotal != bavail + breserved_root + bused))
 107         error("Disk block statistics for '%s' (disk '%s') do not sum up: total = %llu, available = %llu, reserved = %llu, used = %llu", mi->mount_point, disk, (unsigned long long)btotal, (unsigned long long)bavail, (unsigned long long)breserved_root, (unsigned long long)bused);
 108 #endif
 109
 110     // --------------------------------------------------------------------------
 111
 112     fsfilcnt_t favail         = buff_statvfs.f_favail;
 113     fsfilcnt_t ftotal         = buff_statvfs.f_files;
 114     fsfilcnt_t favail_root    = buff_statvfs.f_ffree;
 115     fsfilcnt_t freserved_root = favail_root - favail;
 116     fsfilcnt_t fused          = ftotal - favail_root;
 117
 118 #ifdef NETDATA_INTERNAL_CHECKS
 119     if(unlikely(btotal != bavail + breserved_root + bused))
 120         error("Disk inode statistics for '%s' (disk '%s') do not sum up: total = %llu, available = %llu, reserved = %llu, used = %llu", mi->mount_point, disk, (unsigned long long)ftotal, (unsigned long long)favail, (unsigned long long)freserved_root, (unsigned long long)fused);
 121 #endif
 122
 123     // --------------------------------------------------------------------------
 124
 125     RRDSET *st;
 126
 127     if(do_space == CONFIG_ONDEMAND_YES || (do_space == CONFIG_ONDEMAND_ONDEMAND && (bavail || breserved_root || bused))) {
 128         st = rrdset_find_bytype("disk_space", disk);
 129         if(unlikely(!st)) {
 130             char title[4096 + 1];
 131             snprintfz(title, 4096, "Disk Space Usage for %s [%s]", family, mi->mount_source);
 132             st = rrdset_create("disk_space", disk, NULL, family, "disk.space", title, "GB", 2023, update_every, RRDSET_TYPE_STACKED);
 133
 134             rrddim_add(st, "avail", NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 135             rrddim_add(st, "used" , NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 136             rrddim_add(st, "reserved_for_root", "reserved for root", bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 137         }
 138         else rrdset_next(st);
 139
 140         rrddim_set(st, "avail", (collected_number)bavail);
 141         rrddim_set(st, "used", (collected_number)bused);
 142         rrddim_set(st, "reserved_for_root", (collected_number)breserved_root);
 143         rrdset_done(st);
 144     }
 145
 146     // --------------------------------------------------------------------------
 147
 148     if(do_inodes == CONFIG_ONDEMAND_YES || (do_inodes == CONFIG_ONDEMAND_ONDEMAND && (favail || freserved_root || fused))) {
 149         st = rrdset_find_bytype("disk_inodes", disk);
 150         if(unlikely(!st)) {
 151             char title[4096 + 1];
 152             snprintfz(title, 4096, "Disk Files (inodes) Usage for %s [%s]", family, mi->mount_source);
 153             st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", title, "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 154
 155             rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 156             rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 157             rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 158         }
 159         else rrdset_next(st);
 160
 161         rrddim_set(st, "avail", (collected_number)favail);
 162         rrddim_set(st, "used", (collected_number)fused);
 163         rrddim_set(st, "reserved_for_root", (collected_number)freserved_root);
 164         rrdset_done(st);
 165     }
 166 }
 167
 168 void *proc_diskspace_main(void *ptr) {
 169     struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
 170
 171     info("DISKSPACE thread created with task id %d", gettid());
 172
 173     if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
 174         error("Cannot set pthread cancel type to DEFERRED.");
 175
 176     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
 177         error("Cannot set pthread cancel state to ENABLE.");
 178
 179     int vdo_cpu_netdata = config_get_boolean("plugin:proc", "netdata server resources", 1);
 180
 181     int update_every = (int)config_get_number("plugin:proc:diskspace", "update every", rrd_update_every);
 182     if(update_every < rrd_update_every)
 183         update_every = rrd_update_every;
 184
 185     check_for_new_mountpoints_every = (int)config_get_number("plugin:proc:diskspace", "check for new mount points every", check_for_new_mountpoints_every);
 186     if(check_for_new_mountpoints_every < update_every)
 187         check_for_new_mountpoints_every = update_every;
 188
 189     RRDSET *stcpu_thread = NULL, *st_duration = NULL;
 190     RRDDIM *rd_user = NULL, *rd_system = NULL, *rd_duration = NULL;
 191     struct rusage thread;
 192
 193     usec_t last = 0, dt = 0;
 194     usec_t step = update_every * USEC_PER_SEC;
 195     for(;;) {
 196         usec_t now = now_monotonic_usec();
 197         usec_t next = now - (now % step) + step;
 198
 199         dt = (last)?now - last:0;
 200
 201         while(now < next) {
 202             sleep_usec(next - now);
 203             now = now_monotonic_usec();
 204         }
 205
 206         last = now;
 207
 208         if(unlikely(netdata_exit)) break;
 209
 210
 211         // --------------------------------------------------------------------------
 212         // this is smart enough not to reload it every time
 213
 214         mountinfo_reload(0);
 215
 216
 217         // --------------------------------------------------------------------------
 218         // disk space metrics
 219
 220         struct mountinfo *mi;
 221         for(mi = disk_mountinfo_root; mi; mi = mi->next) {
 222
 223             if(unlikely(mi->flags &
 224                         (MOUNTINFO_IS_DUMMY | MOUNTINFO_IS_BIND | MOUNTINFO_IS_SAME_DEV | MOUNTINFO_NO_STAT |
 225                          MOUNTINFO_NO_SIZE | MOUNTINFO_READONLY)))
 226                 continue;
 227
 228             do_disk_space_stats(mi, update_every);
 229             if(unlikely(netdata_exit)) break;
 230         }
 231
 232         if(unlikely(netdata_exit)) break;
 233
 234         if(vdo_cpu_netdata) {
 235             // ----------------------------------------------------------------
 236
 237             getrusage(RUSAGE_THREAD, &thread);
 238
 239             if(!stcpu_thread) {
 240                 stcpu_thread = rrdset_find("netdata.plugin_diskspace");
 241                 if(!stcpu_thread) {
 242                     stcpu_thread = rrdset_create("netdata", "plugin_diskspace", NULL, "diskspace", NULL
 243                                                  , "NetData Disk Space Plugin CPU usage", "milliseconds/s", 132020
 244                                                  , update_every, RRDSET_TYPE_STACKED);
 245
 246                     rd_user = rrddim_add(stcpu_thread, "user", NULL, 1, 1000, RRDDIM_INCREMENTAL);
 247                     rd_system = rrddim_add(stcpu_thread, "system", NULL, 1, 1000, RRDDIM_INCREMENTAL);
 248                 }
 249             }
 250             else
 251                 rrdset_next(stcpu_thread);
 252
 253             rrddim_set_by_pointer(stcpu_thread, rd_user, thread.ru_utime.tv_sec * 1000000ULL + thread.ru_utime.tv_usec);
 254             rrddim_set_by_pointer(stcpu_thread, rd_system, thread.ru_stime.tv_sec * 1000000ULL + thread.ru_stime.tv_usec);
 255             rrdset_done(stcpu_thread);
 256
 257             // ----------------------------------------------------------------
 258
 259             if(!st_duration) {
 260                 st_duration = rrdset_find("netdata.plugin_diskspace_dt");
 261                 if(!st_duration) {
 262                     st_duration = rrdset_create("netdata", "plugin_diskspace_dt", NULL, "diskspace", NULL
 263                                                  , "NetData Disk Space Plugin Duration", "milliseconds/run", 132021
 264                                                  , update_every, RRDSET_TYPE_AREA);
 265
 266                     rd_duration = rrddim_add(st_duration, "duration", NULL, 1, 1000, RRDDIM_ABSOLUTE);
 267                 }
 268             }
 269             else
 270                 rrdset_next(st_duration);
 271
 272             rrddim_set_by_pointer(st_duration, rd_duration, dt);
 273             rrdset_done(st_duration);
 274
 275             // ----------------------------------------------------------------
 276
 277             if(unlikely(netdata_exit)) break;
 278         }
 279     }
 280
 281     info("DISKSPACE thread exiting");
 282
 283     static_thread->enabled = 0;
 284     static_thread->thread = NULL;
 285     pthread_exit(NULL);
 286     return NULL;
 287 }