[Bug 64816] [nfs] [patch] mmap and/or ftruncate does not work correctly on nfs mounted file systems

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=64816

--- Comment #13 from Rick Macklem <rmacklem@FreeBSD.org> ---
(In reply to Alan Somers from comment #10)
Just fyi, the code that handles mmap'd files,
the buffer cache and friends was not really
re-written in 2009.
--> It was just cloned from the old client.
    --> The intent was to maintain bug compatibility
       (and therefore no POLAs) and I think I
       succeeded.
As such, ancient bugs like this could still exist
in the code.

Although it may not be the same, the last time you
played with fsx, you demonstrated issues when mmap'd
files were ftruncate()'d and I do not remember that
ever getting resolved.
(We did resolve the copy_file_range() case.)

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