From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA16A30C616; Tue, 13 Jan 2026 20:12:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768335161; cv=none; b=MFt/x9l895u8N4Q5kxWq8UGmCTl263ZSYhmLoJ3Lzn9FHb0KlNGKkVhQYddUZu7ueMPCuyhPcdpu3le9dtqUCADQbF3Ag4ZYErTIEnlLO5ayUjAtu568bn5eTlYczmSVyHdBjPRvJ9/nvIC/ATmQ2CBtxRMwvl0yBptdXD5ZX+w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768335161; c=relaxed/simple; bh=X0B6/JX130XnNuXnIOFIbzk18u7Jpymc50J/FJVCnss=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=JbNp3sQTVyJkT5qX85dDS/kwDDG4IeAb3hU81G8DqhIfW2GfVTw0MLBjCn+6M/9XFZcmhkIdx4Fydtlu+Ip8WHAqiqxMxb/zCkbu8u8ubx1XIxTGlrfjHlvEGmQj31RpMOLgWhqThIZ+ROSqNPvWqtGoJiJqpkG5OLmsET6E+Qo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CmnXMak0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CmnXMak0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4C81C116C6; Tue, 13 Jan 2026 20:12:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768335160; bh=X0B6/JX130XnNuXnIOFIbzk18u7Jpymc50J/FJVCnss=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=CmnXMak0XJSW6IMWGIFdZW/qeSmISFs0SXsHekqukRCxMWpLneWE9dd2Zxz4j+Bch njq+2CmLS7ibTWAESyn2LXcwIGDZ1zSSJB+609IZ2EajFueIlfQvjwCWWy28xiJPsa wsLHLaptshTMpDswhqY9EtNIlrX2TJJOmpxidekEG1IN6BgXNpBgI32dyYw+QEtUsX zbgaj0w/2YWr2xuZTgJKls5wtPehfzglCJQeLROy0OAEBn9NYmtuQtJiZBLmosyPtZ 0aLlgavkLGrCDWVhMJLThE4CSYle0mNQUC4XFRf/UqHx8siQ1LOPf7RoiIY/VegbP7 mdDQeHs04EIUQ== Message-ID: <3b5faf0e9bb08c779854e3aaa8b30fb12e86b25e.camel@kernel.org> Subject: Re: [PATCH 1/2] nfsd/sunrpc: add svc_rqst->rq_private pointer and remove rq_lease_breaker From: Jeff Layton To: Chuck Lever , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Trond Myklebust , Anna Schumaker Cc: Benjamin Coddington , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 13 Jan 2026 15:12:38 -0500 In-Reply-To: <6f112559-43e0-41ad-864c-03b1841920d2@app.fastmail.com> References: <20260113-rq_private-v1-0-88ed308364e6@kernel.org> <20260113-rq_private-v1-1-88ed308364e6@kernel.org> <5806015a-ad18-4bc9-a320-2fdab4d86969@app.fastmail.com> <71ddafd443a0e13f79cea09ba2b3ac4f106163ce.camel@kernel.org> <6f112559-43e0-41ad-864c-03b1841920d2@app.fastmail.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.2 (3.58.2-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-01-13 at 14:41 -0500, Chuck Lever wrote: >=20 > On Tue, Jan 13, 2026, at 2:31 PM, Jeff Layton wrote: > > On Tue, 2026-01-13 at 14:21 -0500, Chuck Lever wrote: > > >=20 > > > On Tue, Jan 13, 2026, at 1:37 PM, Jeff Layton wrote: > > > > diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c > > > > index eee8c3f4a251a3fae6e41679de0ec34c76caf198..8ce366c9e49220e8baf= 475c2e5f3424fedc1cec1 100644 > > > > --- a/fs/nfsd/nfssvc.c > > > > +++ b/fs/nfsd/nfssvc.c > > > > @@ -900,6 +900,7 @@ nfsd(void *vrqstp) > > > > struct svc_xprt *perm_sock =3D list_entry(rqstp->rq_server->sv_perm= socks.next, typeof(struct svc_xprt), xpt_list); > > > > struct net *net =3D perm_sock->xpt_net; > > > > struct nfsd_net *nn =3D net_generic(net, nfsd_net_id); > > > > + struct nfsd_thread_local_info ntli =3D { }; > > > > bool have_mutex =3D false; > > > > =20 > > > > /* At this point, the thread shares current->fs > > > > @@ -914,6 +915,8 @@ nfsd(void *vrqstp) > > > > =20 > > > > set_freezable(); > > > > =20 > > > > + rqstp->rq_private =3D &ntli; > > > > + > > > > /* > > > > * The main request loop > > > > */ > > >=20 > > > Thanks for tackling this one. Nits below... > > >=20 > > > This assumes sizeof(structure nfsd_thread_local_info) will always > > > be small enough that it is reasonable to keep on the stack. I > > > can't say that would be a good bet in the long run. > > >=20 > > > And we don't need the perfect reliability of not doing a dynamic > > > allocation here. If kmalloc(sizeof(struct nfsd_thread_local_info)) > > > fails, the thread exits immediately, no harm. > > >=20 > >=20 > > Not sure how much space Ben will need (if any). > >=20 > > We certainly could have nfsd allocate this separately. I didn't see the > > point for something that is only a few bytes though. >=20 > If we are designing for today, another approach would be to set up > a BUILD_WARN_ON or other type of static build failure if this > structure grows larger than, say 256 bytes -- then add dynamic > allocation at that point. >=20 I don't see us growing this to huge proportions. I think that's the sort of thing we just have to watch out for as maintainers. If you really insist on a BUILD_WARN_ON tripwire, I'll add one, but it seems like overkill to me. --=20 Jeff Layton