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

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

            Bug ID: 243925
           Summary: [FUSEFS] Read operation on a write only file
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: chogata at gmail.com

FreeBSD 12.1 introduced a bug that was not present in previous versions.

When using a FUSE-based file system, user tries to append data to a file that
is not cached. File is opened WRITE ONLY, but the first call after open is
read, not write. This is not an allowed behaviour and some file systems will
return EACCESS error.

If the file is cached, then there is no read, only write.

This bug is still present in 13.0 CURRENT (20200130).

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