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

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 06 Feb 2023 01:43:26 UTC

Rick Macklem <rmacklem@FreeBSD.org> changed:

           What    |Removed                     |Added
           Assignee|bugs@FreeBSD.org            |rmacklem@FreeBSD.org

--- Comment #8 from Rick Macklem <rmacklem@FreeBSD.org> ---
Created attachment 239937
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239937&action=edit
do a VOP_FSYNC() after vop_stddeallocate() to push writes of 0s

This simple patch fixes the case that the
test program finds.  I am not 100% sure why
it does fix this, but the code should always
have done this since having the changes
committed to the server before VOP_DEALLOCATE()
returns is required.

Btw, for a newer NFSv4.2 server that supports a
Deallocate operation, your test program works.
(I hacked my server so that Deallocate was
disabled and was able to reproduce the failure
with your test program.)

Maybe asomers@ can test the patch and see if
it fixes all the NFS cases he observes?

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