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60c5d4c42f
PV header extension comes just beyond the existing PV header base: PV header base (existing): - uuid - device size - null-terminated list of Data Areas - null-terminater list of MetaData Areas PV header extension: - extension version - flags - null-terminated list of Embedding Areas This patch also adds "eas" (Embedding Areas) list to lvmcache (lvmcache_info) and it also adds support for common operations on the list (just like for already existing "das" - Data Areas list): - lvmcache_add_ea - lvmcache_update_eas - lvmcache_foreach_ea - lvmcache_del_eas Also, add ea_start and ea_size to struct physical_volume for processing PV Embedding Area location throughout the code (currently only one Embedding Area is supported, though the definition on disk allows for more if needed in the future...). Also, define FMT_EAS format flag to mark that the format actually supports Embedding Areas (currently format-text only).