[Bug 276002] nfscl: data corruption using both copy_file_range and mmap'd I/O

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276002

--- Comment #36 from Lexi Winter <lexi.freebsd@le-fay.org> ---
fwiw, my own issue with NFS+mmap() was using net-p2p/rtorrent, which is a
fairly widely used application and which (famously) uses mmap() for nearly all
filesystem operations.  when running it on NFS, i found it frequently reported
data corruption issues with the files it wrote to (i.e., it would write to
files using mmap(), but on reading those files later, the data that was written
was not as expected).

that said, i am the only person (other than Geoffrey) who i've seen report
issues related to this.  i couldn't say whether this is because the number of
people who use FreeBSD NFS and mmap() is relatively small, or because the
problem was caused by something else.

i only mention this at all to add some context to the discussion :-)

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