46413cedf7
Before this commit, the save-entropy script rotates entropy files like logs. This involves creating a new file that holds the entropy and renaming of all existing entropy files. However, the entropy data do not really need to be kept in a particular order, and replacing the oldest file is sufficient. This commit replaces the rotation with a scan in the [1..entropy_save_num] space that finds the first empty slot, or the slot of the oldest file, and writes entropy into that slot. This also fixes an issue that prevents save-entropy from saving any entropy when there is one non-regular file in any slot as a side effect. Based on an earlier patch from peterj@. PR: 134225 Reported by: peterj Reviewed by: csprng (cem, markm) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D22612
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