Lennart Poettering
ed50f18c4d
When accessing journal files we generally are fine when values change beneath our feet, while we are looking at them, as long as they change from something valid to zero. This is required since we nowadays forcibly unallocate journal files on vacuuming, to ensure they are actually released. However, we need to make sure that the validity checks we enforce are done on suitable copies of the fields in the file. Thus provide a macro that forces a copy, and disallows the compiler from merging our copy with the actually memory where it is from.
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