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 C69CB2D6E59 for ; Mon, 11 Aug 2025 19:56:11 +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=1754942173; cv=none; b=Ybpy/XFdKRYl5c4pYkdvYcO4pOcKzNMR8wgaZmM+zLRdEgxSOA3wCCTFxESlImwoXQ1yfWKicutlzYm24hWd/Ob/jQls0/PfHAspDW5Hy45PI3ef6B6QiyodWghtrFcYGxuX3/PN6jOaKQWqpvQyVaG8CrOfpW+KnIWcg4LFHgY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754942173; c=relaxed/simple; bh=eSA45WUl+IpI7sva6RTB57+D4r+w6rWR9J+1/wkKtSQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=OBH9QF8Z88KEFGNUxVUIThtU6TVdHP2pl5DXzed5ngJNz7wclRmIg22Xo1AQcYI3m8xWS1DytRKekcAaguc7jf0Kn5mEoLPEaSFrAlKt2OBO8Npf3jxkFTknnBEUW+ogtXFWwWWYEYebuN8KrW0dyZdFoD76zawloFxs1tUmO7U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E2j2SwQA; 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="E2j2SwQA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43C98C4CEED; Mon, 11 Aug 2025 19:56:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754942171; bh=eSA45WUl+IpI7sva6RTB57+D4r+w6rWR9J+1/wkKtSQ=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=E2j2SwQAuIsJ2DYaekkotXrBoeyMaHwiUVi0mJtshjGhsckbR6F2ClIt8tq9rluN1 D34pwH1iYnrpW8064aJsjxJeg+OaJ0Br+vJu/A2J7M/UgYYhsyJP0ybCAdsKdRRfx/ gK8bA3Ed3zVJPz3lHochHBKfJS/KwTwD9B5zspAudVgXITqAXpzT88GLa+ZfWWo1qC VL4+IPxcEmkxVr3m81cbRu/evnKw/yNVZzzWZmIMharNbAVXeZf1sbGYYXx2ejnkIq oIZ9AxePpSaqsC6cim99NMC9akU7L/YpDHOcKS463HkHcKYz5WcrzQBhUoCdJx0SgH zgMmkxhFj3mKw== Message-ID: Subject: Re: [RFC PATCH 1/2] nfsd: nfserr_jukebox in nlm_fopen should lead to a retry From: Jeff Layton To: Olga Kornievskaia Cc: Olga Kornievskaia , chuck.lever@oracle.com, linux-nfs@vger.kernel.org, neil@brown.name, Dai.Ngo@oracle.com, tom@talpey.com Date: Mon, 11 Aug 2025 15:56:09 -0400 In-Reply-To: References: <20250811181840.99269-1-okorniev@redhat.com> <20250811181840.99269-2-okorniev@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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at 3:10=E2=80=AFPM Jeff Layton = wrote: > >=20 > > On Mon, 2025-08-11 at 14:18 -0400, Olga Kornievskaia wrote: > > > When v3 NLM request finds a conflicting delegation, it triggers > > > a delegation recall and nfsd_open fails with EAGAIN. nfsd_open > > > then translates EAGAIN into nfserr_jukebox. In nlm_fopen, instead > > > of returning nlm_failed for when there is a conflicting delegation, > > > drop this NLM request so that the client retries. Once delegation > > > is recalled and if a local lock is claimed, a retry would lead to > > > nfsd returning a nlm_lck_blocked error or a successful nlm lock. > > >=20 > > > Signed-off-by: Olga Kornievskaia > > > --- > > > fs/nfsd/lockd.c | 1 + > > > 1 file changed, 1 insertion(+) > > >=20 > > > diff --git a/fs/nfsd/lockd.c b/fs/nfsd/lockd.c > > > index edc9f75dc75c..ad3e461f30c0 100644 > > > --- a/fs/nfsd/lockd.c > > > +++ b/fs/nfsd/lockd.c > > > @@ -57,6 +57,7 @@ nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f,= struct file **filp, > > > switch (nfserr) { > > > case nfs_ok: > > > return 0; > > > + case nfserr_jukebox: > > > case nfserr_dropit: > > > return nlm_drop_reply; > > > case nfserr_stale: > >=20 > > This works by triggering a RPC retransmission. That could time out on > > soft mounts if it takes a while to return a delegation. Looking at the > > NLM spec here: > >=20 > > https://pubs.opengroup.org/onlinepubs/9629799/chap14.htm > >=20 > > What about returning NLM4_DENIED instead? The description there is: > >=20 > > NLM4_DENIED > > The call failed. For attempts to set a lock, this status implies > > that if the client retries the call later, it may succeed. > >=20 > > Presumably the client should redrive this effectively indefinitely that > > way? >=20 > I have previously tried "denied" but that lead to client failing with > no lock just like from nlm_failed instead of retrying. I think only > blocked (or block_grace) leads to a retry. >=20 Thanks, I noticed after I sent the above. I think that the ideal thing to do would be to treat this like a blocked lock and try to call the client back when the delegation is returned. That may be difficult to do properly though, since you won't have a proper lock request to block on. For now, this is a reasonable solution, but it might be good to have a comment that explains why the other options were unacceptable. You can add this to both patches: Reviewed-by: Jeff Layton