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The dataalign value must always be aligned according
to MDA area.
The currect code checks if calculated value collides with
MDA area but not if the value is so small that it is
located before MDA starts.
Unfortunatelly there can be also MDA in the end of the device.
The patch adds simple check to avoid this miscalculation.
Patch expects that first MDA always starts on <= pagesize boundary
(this is true for all allowed label sector parameters).
This patch is not fully tested and leaves some related bugs unfixed.
Intended behaviour of the code now:
pe_start in the lvm2 format PV label header is set only by pvcreate (or
vgconvert -M2) and then preserved in *all* operations thereafter.
In some specialist cases, after the PV is added to a VG, the pe_start
field in the VG metadata may hold a different value and if so, it
overrides the other one for as long as the PV is in such a VG.
Currently, the field storing the size of the data area in the PV label
header always holds 0. As it only has meaning in the context of a
volume group, it is calculated whenever the PV is added to a VG (and can
be derived from extent_size and pe_count in the VG metadata).
Failure to check for label_write() return code caused the following test
to indicate it passed when it really failed:
pvcreate rejects labelsector > 1000000000000
