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Date:      Mon, 03 Jun 2019 17:22:38 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 238312] [FUSEFS] writeback mode actually writes through
Message-ID:  <bug-238312-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D238312

            Bug ID: 238312
           Summary: [FUSEFS] writeback mode actually writes through
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

fusefs has three sysctl-selectable cache modes: uncached, writethrough, and
writeback.  Writeback mode is supposed to be the highest performance.  It's
supposed to cache dirty data in the kernel and flush it occasionally, like =
UFS
does.  However, it's never actually worked that way.  Instead, it writes
through immediately.  Fixing this would probably be as simple as replacing =
the
bwrite calls in fuse_write_biobackend with bdwrite.  But doing it correctly
will require a little bit more work.

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