[Bug 243925] [FUSEFS] Read operation on a write only file

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243925

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|bugs at FreeBSD.org            |fs at FreeBSD.org
                 CC|                            |asomers at FreeBSD.org
            Version|12.1-RELEASE                |CURRENT

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Can you share a specific ordering of IPCs, including exact open flags used and
FUSE procedures seen on the server side?

For cached IO (bio) without O_DIRECT, we probably attempt to read the last
page/sector of a file we are appending to.  Any local filesystem would do
something similar (read a block from the backing volume when a write-only
append handle is open for an uncached, cacheable file), if the file is not a
perfect multiple of the page size.

I think we mostly try to open separate read handles for this, but it's we
missed a case.  Any specific details you can share would be helpful.  Thanks.

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