Motr filesystem stats. The stats are collected from all processes of the nodes the filesystem builds on. Space counters include respective counts from all BE segments mdservice operates on, including seg0, as well as spaces from all storage devices ioservice operates on. Total space includes all total spaces no matter what state the storage device is in. Unlike to total, free space includes counts only from storage devices currently known as on-line devices.
The stats are collected only from the processes which are known to be online to the moment of m0_spiel_filesystem_stats_fetch() call. The implication is that the sum of IOS, MDS, and CAS instances present in configuration under the profile is reported in m0_fs_stats::fs_svc_total, while the number of polled and replied services is reported in m0_fs_stats::fs_svc_replied. So the fact of having some processes in the cluster being offline, or failed to respond correctly, can be detected by the difference between 'service total' and 'service replied' counters.
Definition at line 1321 of file spiel.h.
