5 OST_STATFS ('pb_opc' = 13) is an RPC that queries data about the
6 underlying file system for a given OST. It's form and use are nearly
7 identical to the MDS_STATFS RPC. Refer to <<mds-statfs-rpc>> for
8 details. The only differences in OST_STATFS are that it has a distinct
9 'pb_opc' value, it carries information about an OST (instead of an
10 MDT). The MDT may send regular OST_STATFS RPCs to each OST in order
11 to keep its information about free space and utilization updated.
12 That allows the MDS to make more optimal file allocation decisions.