linux-kernel - Re: [PATCH v2] NFSD: Rework encoding and decoding of nfsd4

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Message-ID: <aH8jeNFJFuxCugKZ@infradead.org>
Date: Mon, 21 Jul 2025 22:36:56 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Sergey Bashirov <sergeybashirov@...il.com>
Cc: Chuck Lever <chuck.lever@...cle.com>, Jeff Layton <jlayton@...nel.org>,
	NeilBrown <neil@...wn.name>,
	Olga Kornievskaia <okorniev@...hat.com>,
	Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] NFSD: Rework encoding and decoding of nfsd4_deviceid

On Mon, Jul 21, 2025 at 05:48:55PM +0300, Sergey Bashirov wrote:
> Compilers may optimize the layout of C structures,

By interpreting the standard in the most hostile way: yes.
In practice: no.

Just about every file system on-disk format and every network wire
protocol depends on the compiler not "optimizing" properly padded
C structures.