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 A794B4A21 for ; Tue, 25 Mar 2025 19:44:16 +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=1742931857; cv=none; b=C2vwzwpKDnCGXSSvlz1pH8H7NkNXCgw+CgJI/WWOw1iDo6i3KmRZT10yQ+NpGraXZMQNJYHUv8LJZqJVv/0pYVM0Zo2aUrFa5L5RU+t5/rArDtDPa7jVmCCkXKHgaRwvMFDnLFvBMkmPrhG+oR7brIJZA992Y8pPbefHnMPQ94U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742931857; c=relaxed/simple; bh=Ya1Km9XPxVeFqIyNPCXd6DePb9WO02pnIHVMmKV5PJQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=e2tDSvw/wNFTDBoY6gRLuWK9LhwHWu5TF9lAbLnVniCWp6BRUsG4xwB3PXii62ukcBRCKU5RQer9SLxP3kVgFyV0O7YNVyb2LbI3owunejhJyoNAdCHQfx8mzhlRktoGmk1mUWfzIo8Qx2AlzGZtlQZDiudpJcLmPDzNhkmKQ+0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A50zDOtk; 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="A50zDOtk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9682FC4CEE4; Tue, 25 Mar 2025 19:44:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1742931856; bh=Ya1Km9XPxVeFqIyNPCXd6DePb9WO02pnIHVMmKV5PJQ=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=A50zDOtkcM/yNgjLHb1r7ObO0cyBarsWPbxsImMsnfRXCKcpothshq2YnX1H3yKBE p2ZBv4ImOJXN1WyIfhHTU5Fb5I4UOMXe3nAIgDBim9kZW9GfJWB2VXy5WAnTFv6lQ+ kk2ABLrN0Z51ByH1WYGrF1RlOU69GMXraa8spfIJMZiRhNGupWzSbxUIxpwOG854hY rtPRUH8w3EZckfcXsPoPVB4AChH9ZMC7yJqXlltUb1iw97lf0BZ83giOA4T1pdchYD E39op1SlOamC6jgUR6OBsqvTFiXQT/r5Im6aRiTID4odhsUbnFG7lFacDlNsLSsGXK HKIdS4Q1ekC4g== Message-ID: <2146465da4d77595aa9876cfc4b636898f08c96e.camel@kernel.org> Subject: Re: [PATCH v2 3/4] NFSv4: clp->cl_cons_state < 0 signifies an invalid nfs_client From: Jeff Layton To: Trond Myklebust , "linux-nfs@vger.kernel.org" Cc: "josef@toxicpanda.com" , bcodding@redhat.com Date: Tue, 25 Mar 2025 15:44:14 -0400 In-Reply-To: References: <56bc4d7e614a6d9d0aa520c71bd0ffb102e3ef08.1742919341.git.trond.myklebust@hammerspace.com> <202d8ae85ba2b1cfb454356a2781ef5b31ff37be.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Tue, 2025-03-25 at 18:48 +0000, Trond Myklebust wrote: > On Tue, 2025-03-25 at 13:59 -0400, Jeff Layton wrote: > > On Tue, 2025-03-25 at 12:17 -0400, trondmy@kernel.org=C2=A0wrote: > > > From: Trond Myklebust > > >=20 > > > If someone calls nfs_mark_client_ready(clp, status) with a negative > > > value for status, then that should signal that the nfs_client is no > > > longer valid. > > >=20 > > > Signed-off-by: Trond Myklebust > > > --- > > > =C2=A0fs/nfs/nfs4state.c | 4 ++-- > > > =C2=A01 file changed, 2 insertions(+), 2 deletions(-) > > >=20 > > > diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c > > > index 542cdf71229f..738eb2789266 100644 > > > --- a/fs/nfs/nfs4state.c > > > +++ b/fs/nfs/nfs4state.c > > > @@ -1198,7 +1198,7 @@ void nfs4_schedule_state_manager(struct > > > nfs_client *clp) > > > =C2=A0 struct rpc_clnt *clnt =3D clp->cl_rpcclient; > > > =C2=A0 bool swapon =3D false; > > > =C2=A0 > > > - if (clnt->cl_shutdown) > > > + if (clnt->cl_shutdown || clp->cl_cons_state < 0) > >=20 > > Would it be simpler to just set cl_shutdown when this occurs instead > > of > > having to check cl_cons_state as well? >=20 > Do we need the check for clnt->cl_shutdown at all here? I'd expect any > caller of this function to already hold a reference to the client, > which means that the RPC client should still be up. Not necessarily? Just because you hold a reference to the rpc_clnt doesn't mean that it's still up, AFAIU. For instance, if you end up using the "shutdown" file in sysfs, any RPC still in flight will hold a reference to the client. Writing to "shutdown" will set cl_shutdown to 1 and then cancel all the RPCs, but there is at least a window of time where we have an elevated refcount but the client is no longer valid. >=20 > I'm a little suspicious of the check in nfs41_sequence_call_done() too. >=20 Me too. I think this is probably an indicator that we need to carefully audit how cl_shutdown is used and clarify what it means. Luckily there are only a handful of places that reference it: The call_start check is fine I thinkhhuhdljkfjltkuddjrig, though maybe we should add cl_shutdown checks in later states? The other places that check it come from this commit: 6ad477a69ad8 NFSv4: Clean up some shutdown loops Should we convert both of those checks to look at clp->cl_cons_state instead? > >=20 > > > =C2=A0 return; > > > =C2=A0 > > > =C2=A0 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); > > > @@ -1403,7 +1403,7 @@ int nfs4_schedule_stateid_recovery(const > > > struct nfs_server *server, struct nfs4_ > > > =C2=A0 dprintk("%s: scheduling stateid recovery for server %s\n", > > > __func__, > > > =C2=A0 clp->cl_hostname); > > > =C2=A0 nfs4_schedule_state_manager(clp); > > > - return 0; > > > + return clp->cl_cons_state < 0 ? clp->cl_cons_state : 0; > > > =C2=A0} > > > =C2=A0EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); > > > =C2=A0 > >=20 >=20 > --=20 > Trond Myklebust > Linux NFS client maintainer, Hammerspace > trond.myklebust@hammerspace.com >=20 >=20 --=20 Jeff Layton