[Bug 269328] nfs client: data corruption using fspacectl and mmap

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269328

--- Comment #1 from Rick Macklem <rmacklem@FreeBSD.org> ---
I wonder if 3b6056204dd8 that was just committed
by kib@ might fix this?

For a 13.1 server (which does not support the
Deallocate operation), the client uses
vop_stddeallocate() and it uses
vn_bmap_seekhole_locked().

If it doesn't fix the problem, then I'd guess
nfs_deallocate() needs a fix for the generic
case where it calls vop_stddeallocate().
nfs_deallocate() does call
vnode_pager_purge_range() before doing the RPC,
but that won't happen against a 13.1 server.
It's not clear to me how vnode_pager_purge_range()
compares to doing a vm_object_page_clean()?

I'll try to test against a 14 server that supports
Deallocate.

If you can test with a client with 3b6056204dd8
and let us know if it helps, that would be nice.

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