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 B985816F265; Tue, 2 Sep 2025 10:21:41 +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=1756808501; cv=none; b=JZbds6UwBcGTrzeCrNLAVsWMfpKUzjucqjDq0DQ1FgJBy1W+237724LUHCrmJQTzEbUdrWiw+4dreU2E5xD5jsXEr9L5YZFkE5d5DTKOlKYg51I9DqGCFHfv4rZuxXfSO9FbQlEeZI/5J5miZO+TmnWVJApAcekKPVtha60duJs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756808501; c=relaxed/simple; bh=NMauv3lFs+e6NrkScZ+h7NFXgCh5zFJMhnXfc3ROVvs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=WeAKFvD7BDBTjsyxG+PzjOFoX0DVmz3Y1ljcuRHm9BhkHCLkrnglhV1nzr744CT9oq1hY49ClHiol4oTNCHOjrB39++jtL97lbONrTvMqaN2Zi9YLglpBpWG4jh75L+zWodha5cvFx4AQ4lESYSnEbaqVkoTUfW1LFBjeXBUslY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aMvPnCkY; 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="aMvPnCkY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 38041C4CEF5; Tue, 2 Sep 2025 10:21:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756808501; bh=NMauv3lFs+e6NrkScZ+h7NFXgCh5zFJMhnXfc3ROVvs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=aMvPnCkYitypShtWuIZQD2zhUbOMYaGL2/kVIyFVpymTVA5aWqbRaSwBByrYC7FK3 /TkQPqu7Nmww/aVt1q4Ol3pfNVQ4IZpvtz8RQGu55fJ+bDybWQbafT0XQYSvjG2egS T+2f/VtIqM+5yJh5yK/f8T4M7iEqLkVo+LtyzQpSYH9fE8wAttdiRYTy+wHozOwoUj DyuY6LMxBSqN8BWYA9Ivfd7kWyHdgAlNdvM2GfBtLTt6mJMTYUQ/gXDzQIr0a7G5xB tz+wGnmkpyr6Mc48Gjhw6MHVGgpiL2wSjeYFPmpkwAKDyCmudqO7oRdQTak7PbT3Fy gt6LxpKM0AXrQ== Message-ID: Subject: Re: [PATCH] nfsd: remove long-standing revoked delegations by force From: Jeff Layton To: Li Lingfeng , chuck.lever@oracle.com, neil@brown.name, okorniev@redhat.com, Dai.Ngo@oracle.com, tom@talpey.com, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Cc: yukuai1@huaweicloud.com, houtao1@huawei.com, yi.zhang@huawei.com, yangerkun@huawei.com, lilingfeng@huaweicloud.com, zhangjian496@huawei.com Date: Tue, 02 Sep 2025 06:21:39 -0400 In-Reply-To: <20250902022237.1488709-1-lilingfeng3@huawei.com> References: <20250902022237.1488709-1-lilingfeng3@huawei.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-09-02 at 10:22 +0800, Li Lingfeng wrote: > When file access conflicts occur between clients, the server recalls > delegations. If the client holding delegation fails to return it after > a recall, nfs4_laundromat adds the delegation to cl_revoked list. > This causes subsequent SEQUENCE operations to set the > SEQ4_STATUS_RECALLABLE_STATE_REVOKED flag, forcing the client to > validate all delegations and return the revoked one. >=20 > However, if the client fails to return the delegation due to a timeout > after receiving the recall or a server bug, the delegation remains in the > server's cl_revoked list. The client marks it revoked and won't find it > upon detecting SEQ4_STATUS_RECALLABLE_STATE_REVOKED. This leads to a loop= : > the server persistently sets SEQ4_STATUS_RECALLABLE_STATE_REVOKED, and th= e > client repeatedly tests all delegations, severely impacting performance > when numerous delegations exist. >=20 It is a performance impact, but I don't get the "loop" here. Are you saying that this problem compounds itself? That testing all delegations causes others to be revoked? > Since abnormal delegations are removed from flc_lease via nfs4_laundromat > --> revoke_delegation --> destroy_unhashed_deleg --> > nfs4_unlock_deleg_lease --> kernel_setlease, and do not block new open > requests indefinitely, retaining such a delegation on the server is > unnecessary. >=20 > Reported-by: Zhang Jian > Fixes: 3bd64a5ba171 ("nfsd4: implement SEQ4_STATUS_RECALLABLE_STATE_REVOK= ED") > Closes: https://lore.kernel.org/all/ff8debe9-6877-4cf7-ba29-fc98eae0ffa0@= huawei.com/ > Signed-off-by: Li Lingfeng > --- > fs/nfsd/nfs4state.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) >=20 > diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c > index 88c347957da5..aa65a685dbb9 100644 > --- a/fs/nfsd/nfs4state.c > +++ b/fs/nfsd/nfs4state.c > @@ -4326,6 +4326,8 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4= _compound_state *cstate, > int buflen; > struct net *net =3D SVC_NET(rqstp); > struct nfsd_net *nn =3D net_generic(net, nfsd_net_id); > + struct list_head *pos, *next; > + struct nfs4_delegation *dp; > =20 > if (resp->opcnt !=3D 1) > return nfserr_sequence_pos; > @@ -4470,6 +4472,15 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd= 4_compound_state *cstate, > default: > seq->status_flags =3D 0; > } > + if (!list_empty(&clp->cl_revoked)) { > + list_for_each_safe(pos, next, &clp->cl_revoked) { > + dp =3D list_entry(pos, struct nfs4_delegation, dl_recall_lru); > + if (dp->dl_time < (ktime_get_boottime_seconds() - 2 * nn->nfsd4_lease= )) { > + list_del_init(&dp->dl_recall_lru); > + nfs4_put_stid(&dp->dl_stid); > + } > + } > + } > if (!list_empty(&clp->cl_revoked)) > seq->status_flags |=3D SEQ4_STATUS_RECALLABLE_STATE_REVOKED; > if (atomic_read(&clp->cl_admin_revoked)) This seems like a violation of the spec. AIUI, the server is required to hang onto a record of the delegation until the client does the TEST_STATEID/FREE_STATEID dance to remove it. Just discarding them like this seems wrong. Should we instead just administratively evict the client since it's clearly not behaving right in this case? --=20 Jeff Layton