[LU-9165] MDS handling of PFL layout initialization

Sat, 8 Jul 2017 02:02:27 +0000

This work tracked the MDS handling of PFL layout object initialization.

Initialize the OST objects of the 1st component of the PFL when its data are being created or its layout being set.
When the client tries to write beyond OST-object-initialized extent range, it will issue an IT_LAYOUT_MOD intent lock RPC, indicating the end offset of the write range, MDS needs to handle this RPC to allocate all OST objects of components covering this range.
MDS also needs to handle the replay of IT_LAYOUT_MOD RPC, which contains the current layout objects which the client knows, so that MDS won't allocate those OST objects again.

Whamcloud Community JIRA