Merging upstream version 1.11.0+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 1438 deletions

diff --git a/src/proc_diskstats.c b/src/proc_diskstats.c
deleted file mode 100644
index 8cde3334b..000000000
--- a/src/proc_diskstats.c
+++ /dev/null
@@ -1,1438 +0,0 @@
-#include "common.h"
-
-#define RRD_TYPE_DISK "disk"
-
-#define DISK_TYPE_UNKNOWN   0
-#define DISK_TYPE_PHYSICAL  1
-#define DISK_TYPE_PARTITION 2
-#define DISK_TYPE_VIRTUAL   3
-
-#define CONFIG_SECTION_DISKSTATS "plugin:proc:/proc/diskstats"
-#define DEFAULT_EXCLUDED_DISKS "loop* ram*"
-
-static struct disk {
-    char *disk;             // the name of the disk (sda, sdb, etc, after being looked up)
-    char *device;           // the device of the disk (before being looked up)
-    unsigned long major;
-    unsigned long minor;
-    int sector_size;
-    int type;
-
-    char *mount_point;
-
-    // disk options caching
-    int do_io;
-    int do_ops;
-    int do_mops;
-    int do_iotime;
-    int do_qops;
-    int do_util;
-    int do_backlog;
-    int do_bcache;
-
-    int updated;
-
-    int device_is_bcache;
-
-    char *bcache_filename_dirty_data;
-    char *bcache_filename_writeback_rate;
-    char *bcache_filename_cache_congested;
-    char *bcache_filename_cache_available_percent;
-    char *bcache_filename_stats_five_minute_cache_hit_ratio;
-    char *bcache_filename_stats_hour_cache_hit_ratio;
-    char *bcache_filename_stats_day_cache_hit_ratio;
-    char *bcache_filename_stats_total_cache_hit_ratio;
-    char *bcache_filename_stats_total_cache_hits;
-    char *bcache_filename_stats_total_cache_misses;
-    char *bcache_filename_stats_total_cache_miss_collisions;
-    char *bcache_filename_stats_total_cache_bypass_hits;
-    char *bcache_filename_stats_total_cache_bypass_misses;
-    char *bcache_filename_stats_total_cache_readaheads;
-
-    RRDSET *st_io;
-    RRDDIM *rd_io_reads;
-    RRDDIM *rd_io_writes;
-
-    RRDSET *st_ops;
-    RRDDIM *rd_ops_reads;
-    RRDDIM *rd_ops_writes;
-
-    RRDSET *st_qops;
-    RRDDIM *rd_qops_operations;
-
-    RRDSET *st_backlog;
-    RRDDIM *rd_backlog_backlog;
-
-    RRDSET *st_util;
-    RRDDIM *rd_util_utilization;
-
-    RRDSET *st_mops;
-    RRDDIM *rd_mops_reads;
-    RRDDIM *rd_mops_writes;
-
-    RRDSET *st_iotime;
-    RRDDIM *rd_iotime_reads;
-    RRDDIM *rd_iotime_writes;
-
-    RRDSET *st_await;
-    RRDDIM *rd_await_reads;
-    RRDDIM *rd_await_writes;
-
-    RRDSET *st_avgsz;
-    RRDDIM *rd_avgsz_reads;
-    RRDDIM *rd_avgsz_writes;
-
-    RRDSET *st_svctm;
-    RRDDIM *rd_svctm_svctm;
-
-    RRDSET *st_bcache_size;
-    RRDDIM *rd_bcache_dirty_size;
-
-    RRDSET *st_bcache_usage;
-    RRDDIM *rd_bcache_available_percent;
-
-    RRDSET *st_bcache_hit_ratio;
-    RRDDIM *rd_bcache_hit_ratio_5min;
-    RRDDIM *rd_bcache_hit_ratio_1hour;
-    RRDDIM *rd_bcache_hit_ratio_1day;
-    RRDDIM *rd_bcache_hit_ratio_total;
-
-    RRDSET *st_bcache;
-    RRDDIM *rd_bcache_hits;
-    RRDDIM *rd_bcache_misses;
-    RRDDIM *rd_bcache_miss_collisions;
-
-    RRDSET *st_bcache_bypass;
-    RRDDIM *rd_bcache_bypass_hits;
-    RRDDIM *rd_bcache_bypass_misses;
-
-    RRDSET *st_bcache_rates;
-    RRDDIM *rd_bcache_rate_congested;
-    RRDDIM *rd_bcache_readaheads;
-    RRDDIM *rd_bcache_rate_writeback;
-
-    struct disk *next;
-} *disk_root = NULL;
-
-#define rrdset_obsolete_and_pointer_null(st) do { if(st) { rrdset_is_obsolete(st); (st) = NULL; } } while(st)
-
-// static char *path_to_get_hw_sector_size = NULL;
-// static char *path_to_get_hw_sector_size_partitions = NULL;
-static char *path_to_sys_dev_block_major_minor_string = NULL;
-static char *path_to_sys_block_device = NULL;
-static char *path_to_sys_block_device_bcache = NULL;
-static char *path_to_sys_devices_virtual_block_device = NULL;
-static char *path_to_device_mapper = NULL;
-static char *path_to_device_label = NULL;
-static char *path_to_device_id = NULL;
-static int name_disks_by_id = CONFIG_BOOLEAN_NO;
-
-static int  global_enable_new_disks_detected_at_runtime = CONFIG_BOOLEAN_YES,
-        global_enable_performance_for_physical_disks = CONFIG_BOOLEAN_AUTO,
-        global_enable_performance_for_virtual_disks = CONFIG_BOOLEAN_AUTO,
-        global_enable_performance_for_partitions = CONFIG_BOOLEAN_NO,
-        global_do_io = CONFIG_BOOLEAN_AUTO,
-        global_do_ops = CONFIG_BOOLEAN_AUTO,
-        global_do_mops = CONFIG_BOOLEAN_AUTO,
-        global_do_iotime = CONFIG_BOOLEAN_AUTO,
-        global_do_qops = CONFIG_BOOLEAN_AUTO,
-        global_do_util = CONFIG_BOOLEAN_AUTO,
-        global_do_backlog = CONFIG_BOOLEAN_AUTO,
-        global_do_bcache = CONFIG_BOOLEAN_AUTO,
-        globals_initialized = 0,
-        global_cleanup_removed_disks = 1;
-
-static SIMPLE_PATTERN *excluded_disks = NULL;
-
-static unsigned long long int bcache_read_number_with_units(const char *filename) {
-    char buffer[50 + 1];
-    if(read_file(filename, buffer, 50) == 0) {
-        static int unknown_units_error = 10;
-
-        char *end = NULL;
-        long double value = str2ld(buffer, &end);
-        if(end && *end) {
-            if(*end == 'k')
-                return (unsigned long long int)(value * 1024.0);
-            else if(*end == 'M')
-                return (unsigned long long int)(value * 1024.0 * 1024.0);
-            else if(*end == 'G')
-                return (unsigned long long int)(value * 1024.0 * 1024.0 * 1024.0);
-            else if(unknown_units_error > 0) {
-                error("bcache file '%s' provides value '%s' with unknown units '%s'", filename, buffer, end);
-                unknown_units_error--;
-            }
-        }
-
-        return (unsigned long long int)value;
-    }
-
-    return 0;
-}
-
-static inline int is_major_enabled(int major) {
-    static int8_t *major_configs = NULL;
-    static size_t major_size = 0;
-
-    if(major < 0) return 1;
-
-    size_t wanted_size = (size_t)major + 1;
-
-    if(major_size < wanted_size) {
-        major_configs = reallocz(major_configs, wanted_size * sizeof(int8_t));
-
-        size_t i;
-        for(i = major_size; i < wanted_size ; i++)
-            major_configs[i] = -1;
-
-        major_size = wanted_size;
-    }
-
-    if(major_configs[major] == -1) {
-        char buffer[CONFIG_MAX_NAME + 1];
-        snprintfz(buffer, CONFIG_MAX_NAME, "performance metrics for disks with major %d", major);
-        major_configs[major] = (char)config_get_boolean(CONFIG_SECTION_DISKSTATS, buffer, 1);
-    }
-
-    return (int)major_configs[major];
-}
-
-static inline int get_disk_name_from_path(const char *path, char *result, size_t result_size, unsigned long major, unsigned long minor, char *disk) {
-    char filename[FILENAME_MAX + 1];
-    int found = 0;
-
-    result_size--;
-
-    DIR *dir = opendir(path);
-    if (!dir) {
-        error("DEVICE-MAPPER ('%s', %lu:%lu): Cannot open directory '%s'. Disabling device-mapper support.", disk, major, minor, path);
-        goto cleanup;
-    }
-
-    struct dirent *de = NULL;
-    while ((de = readdir(dir))) {
-        if(de->d_type != DT_LNK) continue;
-
-        snprintfz(filename, FILENAME_MAX, "%s/%s", path, de->d_name);
-        ssize_t len = readlink(filename, result, result_size);
-        if(len <= 0) {
-            error("DEVICE-MAPPER ('%s', %lu:%lu): Cannot read link '%s'.", disk, major, minor, filename);
-            continue;
-        }
-
-        result[len] = '\0';
-        if(result[0] != '/')
-            snprintfz(filename, FILENAME_MAX, "%s/%s", path, result);
-        else
-            strncpyz(filename, result, FILENAME_MAX);
-
-        struct stat sb;
-        if(stat(filename, &sb) == -1) {
-            error("DEVICE-MAPPER ('%s', %lu:%lu): Cannot stat() file '%s'.", disk, major, minor, filename);
-            continue;
-        }
-
-        if((sb.st_mode & S_IFMT) != S_IFBLK) {
-            // info("DEVICE-MAPPER ('%s', %lu:%lu): file '%s' is not a block device.", disk, major, minor, filename);
-            continue;
-        }
-
-        if(major(sb.st_rdev) != major || minor(sb.st_rdev) != minor) {
-            // info("DEVICE-MAPPER ('%s', %lu:%lu): filename '%s' does not match %lu:%lu.", disk, major, minor, filename, (unsigned long)major(sb.st_rdev), (unsigned long)minor(sb.st_rdev));
-            continue;
-        }
-
-        // info("DEVICE-MAPPER ('%s', %lu:%lu): filename '%s' matches.", disk, major, minor, filename);
-
-        strncpy(result, de->d_name, result_size);
-        found = 1;
-        break;
-    }
-    closedir(dir);
-
-
-cleanup:
-
-    if(!found)
-        result[0] = '\0';
-
-    return found;
-}
-
-static inline char *get_disk_name(unsigned long major, unsigned long minor, char *disk) {
-    char result[FILENAME_MAX + 1] = "";
-
-    if(!path_to_device_mapper || !*path_to_device_mapper || !get_disk_name_from_path(path_to_device_mapper, result, FILENAME_MAX + 1, major, minor, disk))
-        if(!path_to_device_label || !*path_to_device_label || !get_disk_name_from_path(path_to_device_label, result, FILENAME_MAX + 1, major, minor, disk))
-            if(name_disks_by_id != CONFIG_BOOLEAN_YES || !path_to_device_id || !*path_to_device_id || !get_disk_name_from_path(path_to_device_id, result, FILENAME_MAX + 1, major, minor, disk))
-                strncpy(result, disk, FILENAME_MAX);
-
-    if(!result[0])
-        strncpy(result, disk, FILENAME_MAX);
-
-    netdata_fix_chart_name(result);
-    return strdup(result);
-}
-
-static void get_disk_config(struct disk *d) {
-    int def_enable = global_enable_new_disks_detected_at_runtime;
-
-    if(def_enable != CONFIG_BOOLEAN_NO && (simple_pattern_matches(excluded_disks, d->device) || simple_pattern_matches(excluded_disks, d->disk)))
-        def_enable = CONFIG_BOOLEAN_NO;
-
-    char var_name[4096 + 1];
-    snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", d->disk);
-
-    def_enable = config_get_boolean_ondemand(var_name, "enable", def_enable);
-    if(unlikely(def_enable == CONFIG_BOOLEAN_NO)) {
-        // the user does not want any metrics for this disk
-        d->do_io = CONFIG_BOOLEAN_NO;
-        d->do_ops = CONFIG_BOOLEAN_NO;
-        d->do_mops = CONFIG_BOOLEAN_NO;
-        d->do_iotime = CONFIG_BOOLEAN_NO;
-        d->do_qops = CONFIG_BOOLEAN_NO;
-        d->do_util = CONFIG_BOOLEAN_NO;
-        d->do_backlog = CONFIG_BOOLEAN_NO;
-        d->do_bcache = CONFIG_BOOLEAN_NO;
-    }
-    else {
-        // this disk is enabled
-        // check its direct settings
-
-        int def_performance = CONFIG_BOOLEAN_AUTO;
-
-        // since this is 'on demand' we can figure the performance settings
-        // based on the type of disk
-
-        if(!d->device_is_bcache) {
-            switch(d->type) {
-                default:
-                case DISK_TYPE_UNKNOWN:
-                    break;
-
-                case DISK_TYPE_PHYSICAL:
-                    def_performance = global_enable_performance_for_physical_disks;
-                    break;
-
-                case DISK_TYPE_PARTITION:
-                    def_performance = global_enable_performance_for_partitions;
-                    break;
-
-                case DISK_TYPE_VIRTUAL:
-                    def_performance = global_enable_performance_for_virtual_disks;
-                    break;
-            }
-        }
-
-        // check if we have to disable performance for this disk
-        if(def_performance)
-            def_performance = is_major_enabled((int)d->major);
-
-        // ------------------------------------------------------------
-        // now we have def_performance and def_space
-        // to work further
-
-        // def_performance
-        // check the user configuration (this will also show our 'on demand' decision)
-        def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
-
-        int ddo_io = CONFIG_BOOLEAN_NO,
-                ddo_ops = CONFIG_BOOLEAN_NO,
-                ddo_mops = CONFIG_BOOLEAN_NO,
-                ddo_iotime = CONFIG_BOOLEAN_NO,
-                ddo_qops = CONFIG_BOOLEAN_NO,
-                ddo_util = CONFIG_BOOLEAN_NO,
-                ddo_backlog = CONFIG_BOOLEAN_NO,
-                ddo_bcache = CONFIG_BOOLEAN_NO;
-
-        // we enable individual performance charts only when def_performance is not disabled
-        if(unlikely(def_performance != CONFIG_BOOLEAN_NO)) {
-            ddo_io = global_do_io,
-            ddo_ops = global_do_ops,
-            ddo_mops = global_do_mops,
-            ddo_iotime = global_do_iotime,
-            ddo_qops = global_do_qops,
-            ddo_util = global_do_util,
-            ddo_backlog = global_do_backlog,
-            ddo_bcache = global_do_bcache;
-        }
-
-        d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
-        d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
-        d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
-        d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
-        d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
-        d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
-        d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
-
-        if(d->device_is_bcache)
-            d->do_bcache  = config_get_boolean_ondemand(var_name, "bcache", ddo_bcache);
-        else
-            d->do_bcache = 0;
-    }
-}
-
-static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
-    static struct mountinfo *disk_mountinfo_root = NULL;
-
-    struct disk *d;
-
-    // search for it in our RAM list.
-    // this is sequential, but since we just walk through
-    // and the number of disks / partitions in a system
-    // should not be that many, it should be acceptable
-    for(d = disk_root; d ; d = d->next)
-        if(unlikely(d->major == major && d->minor == minor))
-            return d;
-
-    // not found
-    // create a new disk structure
-    d = (struct disk *)callocz(1, sizeof(struct disk));
-
-    d->disk = get_disk_name(major, minor, disk);
-    d->device = strdupz(disk);
-    d->major = major;
-    d->minor = minor;
-    d->type = DISK_TYPE_UNKNOWN; // Default type. Changed later if not correct.
-    d->sector_size = 512; // the default, will be changed below
-    d->next = NULL;
-
-    // append it to the list
-    if(unlikely(!disk_root))
-        disk_root = d;
-    else {
-        struct disk *last;
-        for(last = disk_root; last->next ;last = last->next);
-        last->next = d;
-    }
-
-    char buffer[FILENAME_MAX + 1];
-
-    // find if it is a physical disk
-    // by checking if /sys/block/DISK is readable.
-    snprintfz(buffer, FILENAME_MAX, path_to_sys_block_device, disk);
-    if(likely(access(buffer, R_OK) == 0)) {
-        // assign it here, but it will be overwritten if it is not a physical disk
-        d->type = DISK_TYPE_PHYSICAL;
-    }
-
-    // find if it is a partition
-    // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
-    snprintfz(buffer, FILENAME_MAX, path_to_sys_dev_block_major_minor_string, major, minor, "partition");
-    if(likely(access(buffer, R_OK) == 0)) {
-        d->type = DISK_TYPE_PARTITION;
-    }
-    else {
-        // find if it is a virtual disk
-        // by checking if /sys/devices/virtual/block/DISK is readable.
-        snprintfz(buffer, FILENAME_MAX, path_to_sys_devices_virtual_block_device, disk);
-        if(likely(access(buffer, R_OK) == 0)) {
-            d->type = DISK_TYPE_VIRTUAL;
-        }
-        else {
-            // find if it is a virtual device
-            // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
-            snprintfz(buffer, FILENAME_MAX, path_to_sys_dev_block_major_minor_string, major, minor, "slaves/");
-            DIR *dirp = opendir(buffer);
-            if (likely(dirp != NULL)) {
-                struct dirent *dp;
-                while ((dp = readdir(dirp))) {
-                    // . and .. are also files in empty folders.
-                    if (unlikely(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0)) {
-                        continue;
-                    }
-
-                    d->type = DISK_TYPE_VIRTUAL;
-
-                    // Stop the loop after we found one file.
-                    break;
-                }
-                if (unlikely(closedir(dirp) == -1))
-                    error("Unable to close dir %s", buffer);
-            }
-        }
-    }
-
-    // ------------------------------------------------------------------------
-    // check if we can find its mount point
-
-    // mountinfo_find() can be called with NULL disk_mountinfo_root
-    struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
-    if(unlikely(!mi)) {
-        // mountinfo_free_all can be called with NULL
-        mountinfo_free_all(disk_mountinfo_root);
-        disk_mountinfo_root = mountinfo_read(0);
-        mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
-    }
-
-    if(unlikely(mi))
-        d->mount_point = strdupz(mi->mount_point);
-    else
-        d->mount_point = NULL;
-
-    // ------------------------------------------------------------------------
-    // find the disk sector size
-
-    /*
-     * sector size is always 512 bytes inside the kernel #3481
-     *
-    {
-        char tf[FILENAME_MAX + 1], *t;
-        strncpyz(tf, d->device, FILENAME_MAX);
-
-        // replace all / with !
-        for(t = tf; *t ;t++)
-            if(unlikely(*t == '/')) *t = '!';
-
-        if(likely(d->type == DISK_TYPE_PARTITION))
-            snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
-        else
-            snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
-
-        FILE *fpss = fopen(buffer, "r");
-        if(likely(fpss)) {
-            char buffer2[1024 + 1];
-            char *tmp = fgets(buffer2, 1024, fpss);
-
-            if(likely(tmp)) {
-                d->sector_size = str2i(tmp);
-                if(unlikely(d->sector_size <= 0)) {
-                    error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->device, buffer);
-                    d->sector_size = 512;
-                }
-            }
-            else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->device, buffer);
-
-            fclose(fpss);
-        }
-        else error("Cannot read sector size for device %s from %s. Assuming 512.", d->device, buffer);
-    }
-    */
-
-    // ------------------------------------------------------------------------
-    // check if the device is a bcache
-
-    struct stat bcache;
-    snprintfz(buffer, FILENAME_MAX, path_to_sys_block_device_bcache, disk);
-    if(unlikely(stat(buffer, &bcache) == 0 && (bcache.st_mode & S_IFMT) == S_IFDIR)) {
-        // we have the 'bcache' directory
-        d->device_is_bcache = 1;
-
-        char buffer2[FILENAME_MAX + 1];
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/cache/congested", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_cache_congested = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/readahead", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_readaheads = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/dirty_data", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_dirty_data = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/writeback_rate", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_writeback_rate = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/cache/cache_available_percent", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_cache_available_percent = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_hits", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_hits = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_five_minute/cache_hit_ratio", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_five_minute_cache_hit_ratio = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_hour/cache_hit_ratio", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_hour_cache_hit_ratio = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_day/cache_hit_ratio", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_day_cache_hit_ratio = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_hit_ratio", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_hit_ratio = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_misses", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_misses = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_bypass_hits", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_bypass_hits = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_bypass_misses", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_bypass_misses = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-
-        snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_miss_collisions", buffer);
-        if(access(buffer2, R_OK) == 0)
-            d->bcache_filename_stats_total_cache_miss_collisions = strdupz(buffer2);
-        else
-            error("bcache file '%s' cannot be read.", buffer2);
-    }
-
-    get_disk_config(d);
-    return d;
-}
-
-int do_proc_diskstats(int update_every, usec_t dt) {
-    static procfile *ff = NULL;
-
-    if(unlikely(!globals_initialized)) {
-        globals_initialized = 1;
-
-        global_enable_new_disks_detected_at_runtime = config_get_boolean(CONFIG_SECTION_DISKSTATS, "enable new disks detected at runtime", global_enable_new_disks_detected_at_runtime);
-        global_enable_performance_for_physical_disks = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "performance metrics for physical disks", global_enable_performance_for_physical_disks);
-        global_enable_performance_for_virtual_disks = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "performance metrics for virtual disks", global_enable_performance_for_virtual_disks);
-        global_enable_performance_for_partitions = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "performance metrics for partitions", global_enable_performance_for_partitions);
-
-        global_do_io      = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "bandwidth for all disks", global_do_io);
-        global_do_ops     = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "operations for all disks", global_do_ops);
-        global_do_mops    = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "merged operations for all disks", global_do_mops);
-        global_do_iotime  = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "i/o time for all disks", global_do_iotime);
-        global_do_qops    = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "queued operations for all disks", global_do_qops);
-        global_do_util    = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "utilization percentage for all disks", global_do_util);
-        global_do_backlog = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "backlog for all disks", global_do_backlog);
-        global_do_bcache  = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "bcache for all disks", global_do_bcache);
-
-        global_cleanup_removed_disks = config_get_boolean(CONFIG_SECTION_DISKSTATS, "remove charts of removed disks" , global_cleanup_removed_disks);
-        
-        char buffer[FILENAME_MAX + 1];
-
-        snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s");
-        path_to_sys_block_device = config_get(CONFIG_SECTION_DISKSTATS, "path to get block device", buffer);
-
-        snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s/bcache");
-        path_to_sys_block_device_bcache = config_get(CONFIG_SECTION_DISKSTATS, "path to get block device bcache", buffer);
-
-        snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/devices/virtual/block/%s");
-        path_to_sys_devices_virtual_block_device = config_get(CONFIG_SECTION_DISKSTATS, "path to get virtual block device", buffer);
-
-        snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/dev/block/%lu:%lu/%s");
-        path_to_sys_dev_block_major_minor_string = config_get(CONFIG_SECTION_DISKSTATS, "path to get block device infos", buffer);
-
-        //snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s/queue/hw_sector_size");
-        //path_to_get_hw_sector_size = config_get(CONFIG_SECTION_DISKSTATS, "path to get h/w sector size", buffer);
-
-        //snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
-        //path_to_get_hw_sector_size_partitions = config_get(CONFIG_SECTION_DISKSTATS, "path to get h/w sector size for partitions", buffer);
-
-        snprintfz(buffer, FILENAME_MAX, "%s/dev/mapper", netdata_configured_host_prefix);
-        path_to_device_mapper = config_get(CONFIG_SECTION_DISKSTATS, "path to device mapper", buffer);
-
-        snprintfz(buffer, FILENAME_MAX, "%s/dev/disk/by-label", netdata_configured_host_prefix);
-        path_to_device_label = config_get(CONFIG_SECTION_DISKSTATS, "path to /dev/disk/by-label", buffer);
-
-        snprintfz(buffer, FILENAME_MAX, "%s/dev/disk/by-id", netdata_configured_host_prefix);
-        path_to_device_id = config_get(CONFIG_SECTION_DISKSTATS, "path to /dev/disk/by-id", buffer);
-
-        name_disks_by_id = config_get_boolean(CONFIG_SECTION_DISKSTATS, "name disks by id", name_disks_by_id);
-
-        excluded_disks = simple_pattern_create(
-                config_get(CONFIG_SECTION_DISKSTATS, "exclude disks", DEFAULT_EXCLUDED_DISKS)
-                , NULL
-                , SIMPLE_PATTERN_EXACT
-        );
-    }
-
-    // --------------------------------------------------------------------------
-
-    if(unlikely(!ff)) {
-        char filename[FILENAME_MAX + 1];
-        snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/diskstats");
-        ff = procfile_open(config_get(CONFIG_SECTION_DISKSTATS, "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
-    }
-    if(unlikely(!ff)) return 0;
-
-    ff = procfile_readall(ff);
-    if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
-
-    size_t lines = procfile_lines(ff), l;
-
-    collected_number system_read_kb = 0, system_write_kb = 0;
-
-    for(l = 0; l < lines ;l++) {
-        // --------------------------------------------------------------------------
-        // Read parameters
-
-        char *disk;
-        unsigned long       major = 0, minor = 0;
-
-        collected_number    reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
-                            writes = 0, mwrites = 0, writesectors = 0, writems = 0,
-                            queued_ios = 0, busy_ms = 0, backlog_ms = 0;
-
-        collected_number    last_reads = 0,  last_readsectors = 0,  last_readms = 0,
-                            last_writes = 0, last_writesectors = 0, last_writems = 0,
-                            last_busy_ms = 0;
-
-        size_t words = procfile_linewords(ff, l);
-        if(unlikely(words < 14)) continue;
-
-        major           = str2ul(procfile_lineword(ff, l, 0));
-        minor           = str2ul(procfile_lineword(ff, l, 1));
-        disk            = procfile_lineword(ff, l, 2);
-
-        // # of reads completed # of writes completed
-        // This is the total number of reads or writes completed successfully.
-        reads           = str2ull(procfile_lineword(ff, l, 3));  // rd_ios
-        writes          = str2ull(procfile_lineword(ff, l, 7));  // wr_ios
-
-        // # of reads merged # of writes merged
-        // Reads and writes which are adjacent to each other may be merged for
-        // efficiency.  Thus two 4K reads may become one 8K read before it is
-        // ultimately handed to the disk, and so it will be counted (and queued)
-        mreads          = str2ull(procfile_lineword(ff, l, 4));  // rd_merges_or_rd_sec
-        mwrites         = str2ull(procfile_lineword(ff, l, 8));  // wr_merges
-
-        // # of sectors read # of sectors written
-        // This is the total number of sectors read or written successfully.
-        readsectors     = str2ull(procfile_lineword(ff, l, 5));  // rd_sec_or_wr_ios
-        writesectors    = str2ull(procfile_lineword(ff, l, 9));  // wr_sec
-
-        // # of milliseconds spent reading # of milliseconds spent writing
-        // This is the total number of milliseconds spent by all reads or writes (as
-        // measured from __make_request() to end_that_request_last()).
-        readms          = str2ull(procfile_lineword(ff, l, 6));  // rd_ticks_or_wr_sec
-        writems         = str2ull(procfile_lineword(ff, l, 10)); // wr_ticks
-
-        // # of I/Os currently in progress
-        // The only field that should go to zero. Incremented as requests are
-        // given to appropriate struct request_queue and decremented as they finish.
-        queued_ios      = str2ull(procfile_lineword(ff, l, 11)); // ios_pgr
-
-        // # of milliseconds spent doing I/Os
-        // This field increases so long as field queued_ios is nonzero.
-        busy_ms         = str2ull(procfile_lineword(ff, l, 12)); // tot_ticks
-
-        // weighted # of milliseconds spent doing I/Os
-        // This field is incremented at each I/O start, I/O completion, I/O
-        // merge, or read of these stats by the number of I/Os in progress
-        // (field queued_ios) times the number of milliseconds spent doing I/O since the
-        // last update of this field.  This can provide an easy measure of both
-        // I/O completion time and the backlog that may be accumulating.
-        backlog_ms      = str2ull(procfile_lineword(ff, l, 13)); // rq_ticks
-
-
-        // --------------------------------------------------------------------------
-        // remove slashes from disk names
-        char *s;
-        for(s = disk; *s ;s++)
-            if(*s == '/') *s = '_';
-
-        // --------------------------------------------------------------------------
-        // get a disk structure for the disk
-
-        struct disk *d = get_disk(major, minor, disk);
-        d->updated = 1;
-
-        // --------------------------------------------------------------------------
-        // count the global system disk I/O of physical disks
-
-        if(unlikely(d->type == DISK_TYPE_PHYSICAL)) {
-            system_read_kb  += readsectors * d->sector_size / 1024;
-            system_write_kb += writesectors * d->sector_size / 1024;
-        }
-
-        // --------------------------------------------------------------------------
-        // Set its family based on mount point
-
-        char *family = d->mount_point;
-        if(!family) family = d->disk;
-
-
-        // --------------------------------------------------------------------------
-        // Do performance metrics
-
-        if(d->do_io == CONFIG_BOOLEAN_YES || (d->do_io == CONFIG_BOOLEAN_AUTO && (readsectors || writesectors))) {
-            d->do_io = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_io)) {
-                d->st_io = rrdset_create_localhost(
-                        RRD_TYPE_DISK
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.io"
-                        , "Disk I/O Bandwidth"
-                        , "kilobytes/s"
-                        , "proc"
-                        , "diskstats"
-                        , 2000
-                        , update_every
-                        , RRDSET_TYPE_AREA
-                );
-
-                d->rd_io_reads  = rrddim_add(d->st_io, "reads",  NULL, d->sector_size, 1024,      RRD_ALGORITHM_INCREMENTAL);
-                d->rd_io_writes = rrddim_add(d->st_io, "writes", NULL, d->sector_size * -1, 1024, RRD_ALGORITHM_INCREMENTAL);
-            }
-            else rrdset_next(d->st_io);
-
-            last_readsectors  = rrddim_set_by_pointer(d->st_io, d->rd_io_reads, readsectors);
-            last_writesectors = rrddim_set_by_pointer(d->st_io, d->rd_io_writes, writesectors);
-            rrdset_done(d->st_io);
-        }
-
-        // --------------------------------------------------------------------
-
-        if(d->do_ops == CONFIG_BOOLEAN_YES || (d->do_ops == CONFIG_BOOLEAN_AUTO && (reads || writes))) {
-            d->do_ops = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_ops)) {
-                d->st_ops = rrdset_create_localhost(
-                        "disk_ops"
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.ops"
-                        , "Disk Completed I/O Operations"
-                        , "operations/s"
-                        , "proc"
-                        , "diskstats"
-                        , 2001
-                        , update_every
-                        , RRDSET_TYPE_LINE
-                );
-
-                rrdset_flag_set(d->st_ops, RRDSET_FLAG_DETAIL);
-
-                d->rd_ops_reads  = rrddim_add(d->st_ops, "reads",  NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-                d->rd_ops_writes = rrddim_add(d->st_ops, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-            }
-            else rrdset_next(d->st_ops);
-
-            last_reads  = rrddim_set_by_pointer(d->st_ops, d->rd_ops_reads, reads);
-            last_writes = rrddim_set_by_pointer(d->st_ops, d->rd_ops_writes, writes);
-            rrdset_done(d->st_ops);
-        }
-
-        // --------------------------------------------------------------------
-
-        if(d->do_qops == CONFIG_BOOLEAN_YES || (d->do_qops == CONFIG_BOOLEAN_AUTO && queued_ios)) {
-            d->do_qops = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_qops)) {
-                d->st_qops = rrdset_create_localhost(
-                        "disk_qops"
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.qops"
-                        , "Disk Current I/O Operations"
-                        , "operations"
-                        , "proc"
-                        , "diskstats"
-                        , 2002
-                        , update_every
-                        , RRDSET_TYPE_LINE
-                );
-
-                rrdset_flag_set(d->st_qops, RRDSET_FLAG_DETAIL);
-
-                d->rd_qops_operations = rrddim_add(d->st_qops, "operations", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
-            }
-            else rrdset_next(d->st_qops);
-
-            rrddim_set_by_pointer(d->st_qops, d->rd_qops_operations, queued_ios);
-            rrdset_done(d->st_qops);
-        }
-
-        // --------------------------------------------------------------------
-
-        if(d->do_backlog == CONFIG_BOOLEAN_YES || (d->do_backlog == CONFIG_BOOLEAN_AUTO && backlog_ms)) {
-            d->do_backlog = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_backlog)) {
-                d->st_backlog = rrdset_create_localhost(
-                        "disk_backlog"
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.backlog"
-                        , "Disk Backlog"
-                        , "backlog (ms)"
-                        , "proc"
-                        , "diskstats"
-                        , 2003
-                        , update_every
-                        , RRDSET_TYPE_AREA
-                );
-
-                rrdset_flag_set(d->st_backlog, RRDSET_FLAG_DETAIL);
-
-                d->rd_backlog_backlog = rrddim_add(d->st_backlog, "backlog", NULL, 1, 10, RRD_ALGORITHM_INCREMENTAL);
-            }
-            else rrdset_next(d->st_backlog);
-
-            rrddim_set_by_pointer(d->st_backlog, d->rd_backlog_backlog, backlog_ms);
-            rrdset_done(d->st_backlog);
-        }
-
-        // --------------------------------------------------------------------
-
-        if(d->do_util == CONFIG_BOOLEAN_YES || (d->do_util == CONFIG_BOOLEAN_AUTO && busy_ms)) {
-            d->do_util = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_util)) {
-                d->st_util = rrdset_create_localhost(
-                        "disk_util"
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.util"
-                        , "Disk Utilization Time"
-                        , "% of time working"
-                        , "proc"
-                        , "diskstats"
-                        , 2004
-                        , update_every
-                        , RRDSET_TYPE_AREA
-                );
-
-                rrdset_flag_set(d->st_util, RRDSET_FLAG_DETAIL);
-
-                d->rd_util_utilization = rrddim_add(d->st_util, "utilization", NULL, 1, 10, RRD_ALGORITHM_INCREMENTAL);
-            }
-            else rrdset_next(d->st_util);
-
-            last_busy_ms = rrddim_set_by_pointer(d->st_util, d->rd_util_utilization, busy_ms);
-            rrdset_done(d->st_util);
-        }
-
-        // --------------------------------------------------------------------
-
-        if(d->do_mops == CONFIG_BOOLEAN_YES || (d->do_mops == CONFIG_BOOLEAN_AUTO && (mreads || mwrites))) {
-            d->do_mops = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_mops)) {
-                d->st_mops = rrdset_create_localhost(
-                        "disk_mops"
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.mops"
-                        , "Disk Merged Operations"
-                        , "merged operations/s"
-                        , "proc"
-                        , "diskstats"
-                        , 2021
-                        , update_every
-                        , RRDSET_TYPE_LINE
-                );
-
-                rrdset_flag_set(d->st_mops, RRDSET_FLAG_DETAIL);
-
-                d->rd_mops_reads  = rrddim_add(d->st_mops, "reads",  NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-                d->rd_mops_writes = rrddim_add(d->st_mops, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-            }
-            else rrdset_next(d->st_mops);
-
-            rrddim_set_by_pointer(d->st_mops, d->rd_mops_reads,  mreads);
-            rrddim_set_by_pointer(d->st_mops, d->rd_mops_writes, mwrites);
-            rrdset_done(d->st_mops);
-        }
-
-        // --------------------------------------------------------------------
-
-        if(d->do_iotime == CONFIG_BOOLEAN_YES || (d->do_iotime == CONFIG_BOOLEAN_AUTO && (readms || writems))) {
-            d->do_iotime = CONFIG_BOOLEAN_YES;
-
-            if(unlikely(!d->st_iotime)) {
-                d->st_iotime = rrdset_create_localhost(
-                        "disk_iotime"
-                        , d->device
-                        , d->disk
-                        , family
-                        , "disk.iotime"
-                        , "Disk Total I/O Time"
-                        , "milliseconds/s"
-                        , "proc"
-                        , "diskstats"
-                        , 2022
-                        , update_every
-                        , RRDSET_TYPE_LINE
-                );
-
-                rrdset_flag_set(d->st_iotime, RRDSET_FLAG_DETAIL);
-
-                d->rd_iotime_reads  = rrddim_add(d->st_iotime, "reads",  NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-                d->rd_iotime_writes = rrddim_add(d->st_iotime, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-            }
-            else rrdset_next(d->st_iotime);
-
-            last_readms  = rrddim_set_by_pointer(d->st_iotime, d->rd_iotime_reads, readms);
-            last_writems = rrddim_set_by_pointer(d->st_iotime, d->rd_iotime_writes, writems);
-            rrdset_done(d->st_iotime);
-        }
-
-        // --------------------------------------------------------------------
-        // calculate differential charts
-        // only if this is not the first time we run
-
-        if(likely(dt)) {
-            if( (d->do_iotime == CONFIG_BOOLEAN_YES || (d->do_iotime == CONFIG_BOOLEAN_AUTO && (readms || writems))) &&
-                (d->do_ops    == CONFIG_BOOLEAN_YES || (d->do_ops    == CONFIG_BOOLEAN_AUTO && (reads || writes)))) {
-
-                if(unlikely(!d->st_await)) {
-                    d->st_await = rrdset_create_localhost(
-                            "disk_await"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.await"
-                            , "Average Completed I/O Operation Time"
-                            , "ms per operation"
-                            , "proc"
-                            , "diskstats"
-                            , 2005
-                            , update_every
-                            , RRDSET_TYPE_LINE
-                    );
-
-                    rrdset_flag_set(d->st_await, RRDSET_FLAG_DETAIL);
-
-                    d->rd_await_reads  = rrddim_add(d->st_await, "reads",  NULL,  1, 1, RRD_ALGORITHM_ABSOLUTE);
-                    d->rd_await_writes = rrddim_add(d->st_await, "writes", NULL, -1, 1, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_await);
-
-                rrddim_set_by_pointer(d->st_await, d->rd_await_reads,  (reads  - last_reads)  ? (readms  - last_readms)  / (reads  - last_reads)  : 0);
-                rrddim_set_by_pointer(d->st_await, d->rd_await_writes, (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
-                rrdset_done(d->st_await);
-            }
-
-            if( (d->do_io  == CONFIG_BOOLEAN_YES || (d->do_io  == CONFIG_BOOLEAN_AUTO && (readsectors || writesectors))) &&
-                (d->do_ops == CONFIG_BOOLEAN_YES || (d->do_ops == CONFIG_BOOLEAN_AUTO && (reads || writes)))) {
-
-                if(unlikely(!d->st_avgsz)) {
-                    d->st_avgsz = rrdset_create_localhost(
-                            "disk_avgsz"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.avgsz"
-                            , "Average Completed I/O Operation Bandwidth"
-                            , "kilobytes per operation"
-                            , "proc"
-                            , "diskstats"
-                            , 2006
-                            , update_every
-                            , RRDSET_TYPE_AREA
-                    );
-
-                    rrdset_flag_set(d->st_avgsz, RRDSET_FLAG_DETAIL);
-
-                    d->rd_avgsz_reads  = rrddim_add(d->st_avgsz, "reads",  NULL, d->sector_size, 1024,      RRD_ALGORITHM_ABSOLUTE);
-                    d->rd_avgsz_writes = rrddim_add(d->st_avgsz, "writes", NULL, d->sector_size * -1, 1024, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_avgsz);
-
-                rrddim_set_by_pointer(d->st_avgsz, d->rd_avgsz_reads,  (reads  - last_reads)  ? (readsectors  - last_readsectors)  / (reads  - last_reads)  : 0);
-                rrddim_set_by_pointer(d->st_avgsz, d->rd_avgsz_writes, (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
-                rrdset_done(d->st_avgsz);
-            }
-
-            if( (d->do_util == CONFIG_BOOLEAN_YES || (d->do_util == CONFIG_BOOLEAN_AUTO && busy_ms)) &&
-                (d->do_ops  == CONFIG_BOOLEAN_YES || (d->do_ops  == CONFIG_BOOLEAN_AUTO && (reads || writes)))) {
-
-                if(unlikely(!d->st_svctm)) {
-                    d->st_svctm = rrdset_create_localhost(
-                            "disk_svctm"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.svctm"
-                            , "Average Service Time"
-                            , "ms per operation"
-                            , "proc"
-                            , "diskstats"
-                            , 2007
-                            , update_every
-                            , RRDSET_TYPE_LINE
-                    );
-
-                    rrdset_flag_set(d->st_svctm, RRDSET_FLAG_DETAIL);
-
-                    d->rd_svctm_svctm = rrddim_add(d->st_svctm, "svctm", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_svctm);
-
-                rrddim_set_by_pointer(d->st_svctm, d->rd_svctm_svctm, ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
-                rrdset_done(d->st_svctm);
-            }
-        }
-
-        // --------------------------------------------------------------------------
-        // read bcache metrics and generate the bcache charts
-
-        if(d->device_is_bcache && d->do_bcache != CONFIG_BOOLEAN_NO) {
-            unsigned long long int
-                    stats_total_cache_bypass_hits = 0,
-                    stats_total_cache_bypass_misses = 0,
-                    stats_total_cache_hits = 0,
-                    stats_total_cache_miss_collisions = 0,
-                    stats_total_cache_misses = 0,
-                    stats_five_minute_cache_hit_ratio = 0,
-                    stats_hour_cache_hit_ratio = 0,
-                    stats_day_cache_hit_ratio = 0,
-                    stats_total_cache_hit_ratio = 0,
-                    cache_available_percent = 0,
-                    cache_readaheads = 0,
-                    cache_congested = 0,
-                    dirty_data = 0,
-                    writeback_rate = 0;
-
-            // read the bcache values
-
-            if(d->bcache_filename_dirty_data)
-                dirty_data = bcache_read_number_with_units(d->bcache_filename_dirty_data);
-
-            if(d->bcache_filename_writeback_rate)
-                writeback_rate = bcache_read_number_with_units(d->bcache_filename_writeback_rate);
-
-            if(d->bcache_filename_cache_congested)
-                cache_congested = bcache_read_number_with_units(d->bcache_filename_cache_congested);
-
-            if(d->bcache_filename_cache_available_percent)
-                read_single_number_file(d->bcache_filename_cache_available_percent, &cache_available_percent);
-
-            if(d->bcache_filename_stats_five_minute_cache_hit_ratio)
-                read_single_number_file(d->bcache_filename_stats_five_minute_cache_hit_ratio, &stats_five_minute_cache_hit_ratio);
-
-            if(d->bcache_filename_stats_hour_cache_hit_ratio)
-                read_single_number_file(d->bcache_filename_stats_hour_cache_hit_ratio, &stats_hour_cache_hit_ratio);
-
-            if(d->bcache_filename_stats_day_cache_hit_ratio)
-                read_single_number_file(d->bcache_filename_stats_day_cache_hit_ratio, &stats_day_cache_hit_ratio);
-
-            if(d->bcache_filename_stats_total_cache_hit_ratio)
-                read_single_number_file(d->bcache_filename_stats_total_cache_hit_ratio, &stats_total_cache_hit_ratio);
-
-            if(d->bcache_filename_stats_total_cache_hits)
-                read_single_number_file(d->bcache_filename_stats_total_cache_hits, &stats_total_cache_hits);
-
-            if(d->bcache_filename_stats_total_cache_misses)
-                read_single_number_file(d->bcache_filename_stats_total_cache_misses, &stats_total_cache_misses);
-
-            if(d->bcache_filename_stats_total_cache_miss_collisions)
-                read_single_number_file(d->bcache_filename_stats_total_cache_miss_collisions, &stats_total_cache_miss_collisions);
-
-            if(d->bcache_filename_stats_total_cache_bypass_hits)
-                read_single_number_file(d->bcache_filename_stats_total_cache_bypass_hits, &stats_total_cache_bypass_hits);
-
-            if(d->bcache_filename_stats_total_cache_bypass_misses)
-                read_single_number_file(d->bcache_filename_stats_total_cache_bypass_misses, &stats_total_cache_bypass_misses);
-
-            if(d->bcache_filename_stats_total_cache_readaheads)
-                cache_readaheads = bcache_read_number_with_units(d->bcache_filename_stats_total_cache_readaheads);
-
-
-            // update the charts
-
-            {
-
-                if(unlikely(!d->st_bcache_hit_ratio)) {
-                    d->st_bcache_hit_ratio = rrdset_create_localhost(
-                            "disk_bcache_hit_ratio"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.bcache_hit_ratio"
-                            , "BCache Cache Hit Ratio"
-                            , "percentage"
-                            , "proc"
-                            , "diskstats"
-                            , 2120
-                            , update_every
-                            , RRDSET_TYPE_LINE
-                    );
-
-                    d->rd_bcache_hit_ratio_5min  = rrddim_add(d->st_bcache_hit_ratio, "5min",  NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
-                    d->rd_bcache_hit_ratio_1hour = rrddim_add(d->st_bcache_hit_ratio, "1hour", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
-                    d->rd_bcache_hit_ratio_1day  = rrddim_add(d->st_bcache_hit_ratio, "1day",  NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
-                    d->rd_bcache_hit_ratio_total = rrddim_add(d->st_bcache_hit_ratio, "ever",  NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_bcache_hit_ratio);
-
-                rrddim_set_by_pointer(d->st_bcache_hit_ratio, d->rd_bcache_hit_ratio_5min, stats_five_minute_cache_hit_ratio);
-                rrddim_set_by_pointer(d->st_bcache_hit_ratio, d->rd_bcache_hit_ratio_1hour, stats_hour_cache_hit_ratio);
-                rrddim_set_by_pointer(d->st_bcache_hit_ratio, d->rd_bcache_hit_ratio_1day, stats_day_cache_hit_ratio);
-                rrddim_set_by_pointer(d->st_bcache_hit_ratio, d->rd_bcache_hit_ratio_total, stats_total_cache_hit_ratio);
-                rrdset_done(d->st_bcache_hit_ratio);
-            }
-
-            {
-
-                if(unlikely(!d->st_bcache_rates)) {
-                    d->st_bcache_rates = rrdset_create_localhost(
-                            "disk_bcache_rates"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.bcache_rates"
-                            , "BCache Rates"
-                            , "KB/s"
-                            , "proc"
-                            , "diskstats"
-                            , 2121
-                            , update_every
-                            , RRDSET_TYPE_AREA
-                    );
-
-                    d->rd_bcache_rate_congested = rrddim_add(d->st_bcache_rates, "congested", NULL,  1, 1024, RRD_ALGORITHM_ABSOLUTE);
-                    d->rd_bcache_rate_writeback = rrddim_add(d->st_bcache_rates, "writeback", NULL, -1, 1024, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_bcache_rates);
-
-                rrddim_set_by_pointer(d->st_bcache_rates, d->rd_bcache_rate_writeback, writeback_rate);
-                rrddim_set_by_pointer(d->st_bcache_rates, d->rd_bcache_rate_congested, cache_congested);
-                rrdset_done(d->st_bcache_rates);
-            }
-
-            {
-                if(unlikely(!d->st_bcache_size)) {
-                    d->st_bcache_size = rrdset_create_localhost(
-                            "disk_bcache_size"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.bcache_size"
-                            , "BCache Cache Sizes"
-                            , "MB"
-                            , "proc"
-                            , "diskstats"
-                            , 2122
-                            , update_every
-                            , RRDSET_TYPE_AREA
-                    );
-
-                    d->rd_bcache_dirty_size = rrddim_add(d->st_bcache_size, "dirty", NULL,  1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_bcache_size);
-
-                rrddim_set_by_pointer(d->st_bcache_size, d->rd_bcache_dirty_size, dirty_data);
-                rrdset_done(d->st_bcache_size);
-            }
-
-            {
-                if(unlikely(!d->st_bcache_usage)) {
-                    d->st_bcache_usage = rrdset_create_localhost(
-                            "disk_bcache_usage"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.bcache_usage"
-                            , "BCache Cache Usage"
-                            , "percent"
-                            , "proc"
-                            , "diskstats"
-                            , 2123
-                            , update_every
-                            , RRDSET_TYPE_AREA
-                    );
-
-                    d->rd_bcache_available_percent = rrddim_add(d->st_bcache_usage, "avail", NULL,  1, 1, RRD_ALGORITHM_ABSOLUTE);
-                }
-                else rrdset_next(d->st_bcache_usage);
-
-                rrddim_set_by_pointer(d->st_bcache_usage, d->rd_bcache_available_percent, cache_available_percent);
-                rrdset_done(d->st_bcache_usage);
-            }
-
-            if(d->do_bcache == CONFIG_BOOLEAN_YES || (d->do_bcache == CONFIG_BOOLEAN_AUTO && (stats_total_cache_hits != 0 || stats_total_cache_misses != 0 || stats_total_cache_miss_collisions != 0))) {
-
-                if(unlikely(!d->st_bcache)) {
-                    d->st_bcache = rrdset_create_localhost(
-                            "disk_bcache"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.bcache"
-                            , "BCache Cache I/O Operations"
-                            , "operations/s"
-                            , "proc"
-                            , "diskstats"
-                            , 2124
-                            , update_every
-                            , RRDSET_TYPE_LINE
-                    );
-
-                    rrdset_flag_set(d->st_bcache, RRDSET_FLAG_DETAIL);
-
-                    d->rd_bcache_hits            = rrddim_add(d->st_bcache, "hits",       NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-                    d->rd_bcache_misses          = rrddim_add(d->st_bcache, "misses",     NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-                    d->rd_bcache_miss_collisions = rrddim_add(d->st_bcache, "collisions", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-                    d->rd_bcache_readaheads      = rrddim_add(d->st_bcache, "readaheads", NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-                }
-                else rrdset_next(d->st_bcache);
-
-                rrddim_set_by_pointer(d->st_bcache, d->rd_bcache_hits, stats_total_cache_hits);
-                rrddim_set_by_pointer(d->st_bcache, d->rd_bcache_misses, stats_total_cache_misses);
-                rrddim_set_by_pointer(d->st_bcache, d->rd_bcache_miss_collisions, stats_total_cache_miss_collisions);
-                rrddim_set_by_pointer(d->st_bcache, d->rd_bcache_readaheads, cache_readaheads);
-                rrdset_done(d->st_bcache);
-            }
-
-            if(d->do_bcache == CONFIG_BOOLEAN_YES || (d->do_bcache == CONFIG_BOOLEAN_AUTO && (stats_total_cache_bypass_hits != 0 || stats_total_cache_bypass_misses != 0))) {
-
-                if(unlikely(!d->st_bcache_bypass)) {
-                    d->st_bcache_bypass = rrdset_create_localhost(
-                            "disk_bcache_bypass"
-                            , d->device
-                            , d->disk
-                            , family
-                            , "disk.bcache_bypass"
-                            , "BCache Cache Bypass I/O Operations"
-                            , "operations/s"
-                            , "proc"
-                            , "diskstats"
-                            , 2125
-                            , update_every
-                            , RRDSET_TYPE_LINE
-                    );
-
-                    rrdset_flag_set(d->st_bcache_bypass, RRDSET_FLAG_DETAIL);
-
-                    d->rd_bcache_bypass_hits   = rrddim_add(d->st_bcache_bypass, "hits",   NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-                    d->rd_bcache_bypass_misses = rrddim_add(d->st_bcache_bypass, "misses", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-                }
-                else rrdset_next(d->st_bcache_bypass);
-
-                rrddim_set_by_pointer(d->st_bcache_bypass, d->rd_bcache_bypass_hits, stats_total_cache_bypass_hits);
-                rrddim_set_by_pointer(d->st_bcache_bypass, d->rd_bcache_bypass_misses, stats_total_cache_bypass_misses);
-                rrdset_done(d->st_bcache_bypass);
-            }
-        }
-    }
-
-
-    // ------------------------------------------------------------------------
-    // update the system total I/O
-
-    if(global_do_io == CONFIG_BOOLEAN_YES || (global_do_io == CONFIG_BOOLEAN_AUTO && (system_read_kb || system_write_kb))) {
-        static RRDSET *st_io = NULL;
-        static RRDDIM *rd_in = NULL, *rd_out = NULL;
-
-        if(unlikely(!st_io)) {
-            st_io = rrdset_create_localhost(
-                    "system"
-                    , "io"
-                    , NULL
-                    , "disk"
-                    , NULL
-                    , "Disk I/O"
-                    , "kilobytes/s"
-                    , "proc"
-                    , "diskstats"
-                    , 150
-                    , update_every
-                    , RRDSET_TYPE_AREA
-            );
-
-            rd_in  = rrddim_add(st_io, "in",  NULL,  1, 1, RRD_ALGORITHM_INCREMENTAL);
-            rd_out = rrddim_add(st_io, "out", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
-        }
-        else rrdset_next(st_io);
-
-        rrddim_set_by_pointer(st_io, rd_in, system_read_kb);
-        rrddim_set_by_pointer(st_io, rd_out, system_write_kb);
-        rrdset_done(st_io);
-    }
-
-
-    // ------------------------------------------------------------------------
-    // cleanup removed disks
-
-    struct disk *d = disk_root, *last = NULL;
-    while(d) {
-        if(unlikely(global_cleanup_removed_disks && !d->updated)) {
-            struct disk *t = d;
-
-            rrdset_obsolete_and_pointer_null(d->st_avgsz);
-            rrdset_obsolete_and_pointer_null(d->st_await);
-            rrdset_obsolete_and_pointer_null(d->st_backlog);
-            rrdset_obsolete_and_pointer_null(d->st_io);
-            rrdset_obsolete_and_pointer_null(d->st_iotime);
-            rrdset_obsolete_and_pointer_null(d->st_mops);
-            rrdset_obsolete_and_pointer_null(d->st_ops);
-            rrdset_obsolete_and_pointer_null(d->st_qops);
-            rrdset_obsolete_and_pointer_null(d->st_svctm);
-            rrdset_obsolete_and_pointer_null(d->st_util);
-            rrdset_obsolete_and_pointer_null(d->st_bcache);
-            rrdset_obsolete_and_pointer_null(d->st_bcache_bypass);
-            rrdset_obsolete_and_pointer_null(d->st_bcache_rates);
-            rrdset_obsolete_and_pointer_null(d->st_bcache_size);
-            rrdset_obsolete_and_pointer_null(d->st_bcache_usage);
-            rrdset_obsolete_and_pointer_null(d->st_bcache_hit_ratio);
-
-            if(d == disk_root) {
-                disk_root = d = d->next;
-                last = NULL;
-            }
-            else if(last) {
-                last->next = d = d->next;
-            }
-
-            freez(t->bcache_filename_dirty_data);
-            freez(t->bcache_filename_writeback_rate);
-            freez(t->bcache_filename_cache_congested);
-            freez(t->bcache_filename_cache_available_percent);
-            freez(t->bcache_filename_stats_five_minute_cache_hit_ratio);
-            freez(t->bcache_filename_stats_hour_cache_hit_ratio);
-            freez(t->bcache_filename_stats_day_cache_hit_ratio);
-            freez(t->bcache_filename_stats_total_cache_hit_ratio);
-            freez(t->bcache_filename_stats_total_cache_hits);
-            freez(t->bcache_filename_stats_total_cache_misses);
-            freez(t->bcache_filename_stats_total_cache_miss_collisions);
-            freez(t->bcache_filename_stats_total_cache_bypass_hits);
-            freez(t->bcache_filename_stats_total_cache_bypass_misses);
-            freez(t->bcache_filename_stats_total_cache_readaheads);
-
-            freez(t->disk);
-            freez(t->device);
-            freez(t->mount_point);
-            freez(t);
-        }
-        else {
-            d->updated = 0;
-            last = d;
-            d = d->next;
-        }
-    }
-
-    return 0;
-}