https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238312
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: b...@freebsd.org
Reporter: asom...@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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