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b876dbfc24
There have been two separate checks for metadata validity: first that the metadata text begins with a valid VG name, and second the checksum of the metadata text. These happen in different places, which means there have been two separate error paths for invalid metadata. This also causes large metadata to be read in multiple parts, the first part is read just to check the vgname, and then remaining parts are read later when the full metadata is needed. This patch moves the vg name verification so it's done just before the checksum verification, which results in a single error path for invalid metadata, and causes the entire metadata to be read together rather that in parts from different parts of the code.