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during drain operations. When an sbuf is configured to use this feature by way of the SBUF_DRAINTOEOR sbuf_new() flag, top-level sections started with sbuf_start_section() create a record boundary marker that is used to avoid flushing partial records. Reviewed by: cem,imp,wblock MFC after: 2 weeks Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D8536