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302b6c99a7
The previous patch felt short WRT disabling allocation on PVs holding other legs of the RAID LV persistently; this patch introduces an internal, transient PV flag PV_ALLOCATION_PROHIBITED to address this very problem. General problem description for completeness: An 'lvconvert --repair $RAID_LV" to replace a failed leg of a multi-segment RAID10/4/5/6 logical volume can lead to allocation of (parts of) the replacement image component pair on the physical volume of another image component (e.g. image 0 allocated on the same PV as image 1 silently impeding resilience). Patch fixes this severe resilince issue by prohibiting allocation on PVs already holding other legs of the RAID set. It allows to allocate free space on any operational PV already holding parts of the image component pair.