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 ECDB626C3B0; Fri, 27 Mar 2026 15:52:17 +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=1774626738; cv=none; b=lu3l+aYz8JCuo5KowJvkmLlPEGmfBbIqEbjpWnC48uaIUf0iXUn2H2pZfpW+Q+MUVSjyvuwmhXc0Ajgm11apNKRiV2UTt0R+tUvye0SBFN3o4sVeig364PCbuj/PbzT78TvqpoF3IeeWrMShkDLbh7Z3NK1q4Ms+Oj+GEbwwvzw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774626738; c=relaxed/simple; bh=xVldCLkeQ3CWQimDRfs+50lrsy5sQQTHfQkf+WsM6fg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=C1ynrfbpRjJ/7vxAXabdSopTqpeC/tSLRUNtcpqaUH9ppVePfXK9Ofrto28Hr/1hZuLMpjxA9zblUHZr8FXM1887TS2yZhrm53Fb+uGEd3PC+66JfFTh7EFAND+vEk4MFUKE8iRQm/Zmj1r39LJVoCDzOYeGVNryCLyAu3CnqJM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=uhJ7QSVW; 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="uhJ7QSVW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6C29C19423; Fri, 27 Mar 2026 15:52:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774626737; bh=xVldCLkeQ3CWQimDRfs+50lrsy5sQQTHfQkf+WsM6fg=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=uhJ7QSVWCH+f7PISgf8Rp+qZhVhXMh1GXBlenov4mSsZXv6JEMFVXdwtjM/5JhtLL dF8jE1NtBkQcI6pXod2odVjyyYMEXMTIqP9kButmwes652naZPFrnQopBAda0WPUiR 0bQtO+D8tWVIacrU4JL4C/SJ849+h+1jkYs1jBoAbMdLXTHN82+5yCdwcF0b8V0DY+ l3iN9Yemn3kugMMbQtQc/gGZHF0HmBFgqONmjT2v0Cqf3DlC4fdbUZ2bG30qlPHdEM JyaadtNOw0w8HG6ykhA3dK3ApIynoBr7NnHUagFhIx9iAl2+nRQkmRzn2iEngdwO/v adul4womjH6Xg== Message-ID: Subject: Re: [PATCH v5 2/7] NFSD: Add NFSD_CMD_UNLOCK_IP netlink command From: Jeff Layton To: Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, Chuck Lever Date: Fri, 27 Mar 2026 11:52:14 -0400 In-Reply-To: References: <20260326-umount-kills-nfsv4-state-v5-0-d2ce071b3570@oracle.com> <20260326-umount-kills-nfsv4-state-v5-2-d2ce071b3570@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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at 8:06 AM, Jeff Layton wrote: > > On Thu, 2026-03-26 at 13:55 -0400, Chuck Lever wrote: >=20 > > > diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c > > > index 988a79ec4a79..e1e89d52e6de 100644 > > > --- a/fs/nfsd/nfsctl.c > > > +++ b/fs/nfsd/nfsctl.c >=20 > > > @@ -2200,6 +2200,44 @@ int nfsd_nl_pool_mode_get_doit(struct sk_buff = *skb, struct genl_info *info) > > > return err; > > > } > > > =20 > > > +/** > > > + * nfsd_nl_unlock_ip_doit - release NLM locks held by an IP address > > > + * @skb: reply buffer > > > + * @info: netlink metadata and command arguments > > > + * > > > + * Return: 0 on success or a negative errno. > > > + */ > > > +int nfsd_nl_unlock_ip_doit(struct sk_buff *skb, struct genl_info *in= fo) > > > +{ > > > + struct sockaddr *sap; > > > + > > > + if (GENL_REQ_ATTR_CHECK(info, NFSD_A_UNLOCK_IP_ADDRESS)) > > > + return -EINVAL; > > > + sap =3D nla_data(info->attrs[NFSD_A_UNLOCK_IP_ADDRESS]); > > > + switch (sap->sa_family) { > > > + case AF_INET: > > > + if (nla_len(info->attrs[NFSD_A_UNLOCK_IP_ADDRESS]) < > > > + sizeof(struct sockaddr_in)) > > > + return -EINVAL; > > > + break; > > > + case AF_INET6: > > > + if (nla_len(info->attrs[NFSD_A_UNLOCK_IP_ADDRESS]) < > > > + sizeof(struct sockaddr_in6)) > > > + return -EINVAL; > > > + break; > > > + default: > > > + return -EAFNOSUPPORT; > > > + } > > > + /* > > > + * nlmsvc_unlock_all_by_ip() releases matching locks > > > + * across all network namespaces because lockd operates > > > + * a single global instance. > > > + */ > > > + trace_nfsd_ctl_unlock_ip(genl_info_net(info), sap, > > > + svc_addr_len(sap)); > >=20 > > All of the tracepoints get passed svc_addr_len(sap) for the length. Any > > reason not to just determine the length inside the tracepoint, so you > > don't need to calc the length unless it's enabled? >=20 > Unless I'm mistaken, the trace_nfsd_ctl_unlock_ip() call site > expands to a static branch that skips everything, including > argument evaluation, when the tracepoint is disabled. The > svc_addr_len() call, being part of the argument list, is > already behind that branch. >=20 It's a minor thing, but fewer arguments to a tracepoint is nicer, IMO. >=20 > > > + return nlmsvc_unlock_all_by_ip(sap); > > > +} > > > + > > > /** > > > * nfsd_net_init - Prepare the nfsd_net portion of a new net namespa= ce > > > * @net: a freshly-created network namespace >=20 --=20 Jeff Layton