Date:   Wed, 5 Jan 2022 10:54:51 -0500
From:   "bfields@fieldses.org" <bfields@fieldses.org>
To:     Ondrej Valousek <ondrej.valousek.xm@renesas.com>
Cc:     Trond Myklebust <trondmy@hammerspace.com>,
        "trondmy@kernel.org" <trondmy@kernel.org>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
        "anna.schumaker@netapp.com" <anna.schumaker@netapp.com>
Subject: Re: [PATCH 0/8] Support btime and other NFSv4 specific attributes
Message-ID: <20220105155451.GA25384@fieldses.org>
References: <20211217204854.439578-1-trondmy@kernel.org>
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On Wed, Jan 05, 2022 at 03:40:19PM +0000, Ondrej Valousek wrote:
> 
> >> - AFAIK support for RFC8276 in NFS (only version 4.2) server is since kernel 5.9, right? NFS client supports these as well?
> >> - The patches below implements the feature in both, nfs client AND server, right?
> 
> > Client only.
> 
> Right, but then it will be only useful if we use non-linux based NFS server right?
> 
> I mean simply:
> 1. $ stat /tmp/foo.txt   --> shows birth date
> 2. # exportfs \*/tmp
> 3. # mount 127.0.0.1:/tmp /mnt
> 4. $ stat /mnt/foo.txt   --> no birth date shown

Right.

Fixing that's likely just a few lines of code added to
fs/nfsd/nfs4xdr.c:nfsd4_encode_fattr().  Patches welcome.

--b.