linux-kernel - Re: [PATCH 2/5] fs,nfs: lift compat nfs4 mount data handling into the nfs code

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Message-ID: <20200917171604.GW3421308@ZenIV.linux.org.uk>
Date:   Thu, 17 Sep 2020 18:16:04 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH 2/5] fs,nfs: lift compat nfs4 mount data handling into
 the nfs code

On Thu, Sep 17, 2020 at 10:22:33AM +0200, Christoph Hellwig wrote:
> There is no reason the generic fs code should bother with NFS specific
> binary mount data - lift the conversion into nfs4_parse_monolithic
> instead.

Considering the size of struct compat_nfs4_mount_data_v1...  Do we really
need to bother with that "copy in place, so we go through the fields
backwards" logics?  Just make that

> +static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data)
> +{
	struct compat_nfs4_mount_data_v1 compat;
	compat = *(struct compat_nfs4_mount_data_v1 *)data;
and copy the damnt thing without worrying about the field order...