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6407d184d1
Refactor the recent metadata-reading optimisation patches. Remove the recently-added cache fields from struct labeller and struct format_instance. Instead, introduce struct lvmcache_vgsummary to wrap the VG information that lvmcache holds and add the metadata size and checksum to it. Allow this VG summary information to be looked up by metadata size + checksum. Adjust the debug log messages to make it clear when this shortcut has been successful. (This changes the optimisation slightly, and might be extendable further.) Add struct cached_vg_fmtdata to format-specific vg_read calls to preserve state alongside the VG across separate calls and indicate if the details supplied match, avoiding the need to read and process the VG metadata again.