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 E3CBF49652 for ; Thu, 16 Jan 2025 14:46:13 +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=1737038774; cv=none; b=H+Zpf+XpW5WvCY3bNhCQuPShEfmYpsdr4kp50dtaPXN/fz7Z8ZMXQPqIkhdKyIKZS++P1BTg8qFHDP8revoNMIu+lAXTr5Ai5dRP249iDJXs4fOJrFr/ttsoFcCSU/BYmx5oYtBX+gBSlv8X6qYEJrdHosWVu7NSO9VEY7YogNA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737038774; c=relaxed/simple; bh=j8XAFqbt6cWBL56tyHfxoHX94sEgTv1ZjWCiF5IwIzY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=A0Wo7tC+THPr3Y+9+LYkWB2ZjhLNuUGEkrRBO/q6YiSgE/15Zln0QApondpe82z/XXjume01FGjlbhHuikj24RCmreWdjI5aKTVuc5m41FDkRuqHxKZnoNVY76tdLw99eUdIRmAzQSLD5CmbRwTSRPhG8nDw6xzoxFrKidfsrLI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kUYZXWnQ; 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="kUYZXWnQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33D6FC4CED6; Thu, 16 Jan 2025 14:46:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737038773; bh=j8XAFqbt6cWBL56tyHfxoHX94sEgTv1ZjWCiF5IwIzY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=kUYZXWnQrfNSGp2dPpqAECsqzYT3uLd7vWTEN5lVmdjLpGZfF8uR0dxMfeT5edGdK DAEcp6GGzx/wlCQTN9mObDrs8LMWFdNId7AuPpZEsEsCRBGjBApnlRDKMescL3K7eN ruVKYG0rViI9XjO17AtBgsKcSsqdZSjJwwjpyEMt08dmnvjpg85Qlx3bl2CTihlTV7 m/cfVnnFEIjPcQTw19JqGHyJfFT07uX4jfg/T4T604fmOFLXaba6iRmV8k2w7ggzAw USTBplFRV5Za8IuIv15oLHyi0NOQNv2HEC3c9p/HuLdIsIR4sjFj8osZ+ashS5qbQv C4N234oigz7Gw== Message-ID: <62694be2aea08c40af7b0cea9d8c1b67a7b2cbe7.camel@kernel.org> Subject: Re: [PATCH 3/3] nfsd: fix management of listener transports From: Jeff Layton To: Chuck Lever , Olga Kornievskaia Cc: linux-nfs@vger.kernel.org Date: Thu, 16 Jan 2025 09:46:11 -0500 In-Reply-To: <62d3ced2-8c90-4699-b3c4-c58489ec9f19@oracle.com> References: <20250115232406.44815-1-okorniev@redhat.com> <20250115232406.44815-4-okorniev@redhat.com> <62d3ced2-8c90-4699-b3c4-c58489ec9f19@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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Kornievskaia wrote: > > When a particular listener is being removed we need to make sure > > that we delete the entry from the list of permanent sockets > > (sv_permsocks) as well as remove it from the listener transports > > (sp_xprts). When adding back the leftover transports not being > > removed we need to clear XPT_BUSY flag so that it can be used. > >=20 > > Fixes: 16a471177496 ("NFSD: add listener-{set,get} netlink command") > > Signed-off-by: Olga Kornievskaia > > --- > > fs/nfsd/nfsctl.c | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > >=20 > > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c > > index 95ea4393305b..3deedd511e83 100644 > > --- a/fs/nfsd/nfsctl.c > > +++ b/fs/nfsd/nfsctl.c > > @@ -1988,7 +1988,7 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb= , struct genl_info *info) > > /* Close the remaining sockets on the permsocks list */ > > while (!list_empty(&permsocks)) { > > xprt =3D list_first_entry(&permsocks, struct svc_xprt, xpt_list); > > - list_move(&xprt->xpt_list, &serv->sv_permsocks); > > + list_del_init(&xprt->xpt_list); > > =20 > > /* > > * Newly-created sockets are born with the BUSY bit set. Clear > > @@ -2000,6 +2000,7 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb= , struct genl_info *info) > > =20 > > set_bit(XPT_CLOSE, &xprt->xpt_flags); > > spin_unlock_bh(&serv->sv_lock); > > + svc_xprt_dequeue_entry(xprt); >=20 > The kdoc comment in front of llist_del_entry() says: >=20 > + * The caller must ensure that nothing can race in and change the > + * list while this is running. >=20 > In this caller, I don't see how such a race is prevented. >=20 This caller holds the nfsd_mutex, and prior to this, it does: /* For now, no removing old sockets while server is running */ if (serv->sv_nrthreads && !list_empty(&permsocks)) { list_splice_init(&permsocks, &serv->sv_permsocks); spin_unlock_bh(&serv->sv_lock); err =3D -EBUSY; goto out_unlock_mtx; } No nfsd threads are running and none can be started, so nothing is processing the queue at this time. Some comments explaining that would be a welcome addition here. >=20 > > svc_xprt_close(xprt); > > spin_lock_bh(&serv->sv_lock); > > } > > @@ -2031,6 +2032,7 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb= , struct genl_info *info) > > =20 > > xprt =3D svc_find_listener(serv, xcl_name, net, sa); > > if (xprt) { > > + clear_bit(XPT_BUSY, &xprt->xpt_flags); > > svc_xprt_put(xprt); > > continue; > > } >=20 >=20 --=20 Jeff Layton