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 BC56C396D32; Fri, 27 Mar 2026 12:18:24 +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=1774613904; cv=none; b=uWfPRM6QFg1BLD5EJOW3shDe49lT/KD7PiIliPyh7XFv4p0Ya9PbvgoKhgV+GNtuWtKySUgclN6JcMTg4tj+PhLIjp5iBLKXuv5DLTDqPA1hFdWFnSzGwupJwsYP67dy7ptPzwRyh6IQV0DnPy7c0uQIcmsovvfD0tEsLxbk7X4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774613904; c=relaxed/simple; bh=31tkInjbov8fVr8VpqsQcVgSdVchWojHEJmbWqoIMoo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=sEz4a/J0tyKZHCPlH7/mSZpfJ7oFM9VByXTAfW7fPL/M5awVnAmtRYK8WFd9e2eNSdw5VmHHbbhzEJegZhR1W7hWeZ6QX/sAOdkgBVeFm1N3iOt65+y0hY9Rj+YlCEuBKpto0ZVqqWGRwvOrBMU5pjZHz8xSbMZkfS8XfDAlr2U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OUJq8H/c; 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="OUJq8H/c" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79EA5C19423; Fri, 27 Mar 2026 12:18:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774613904; bh=31tkInjbov8fVr8VpqsQcVgSdVchWojHEJmbWqoIMoo=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=OUJq8H/cnJjzWOeMuqHpSlcwKfT5Lq0EMX6xb2FPILLq1sofTUl3P5N+pi6s65N+N rwhSvCdwNzoK2pHDaQr56grqL1NdGsmK7kFJqu04GnBPTWms3QQAZQvfh2wIgS4iCH cgPkxJNXOv4zvd62JHKjgOdOvisuqCPHchhiEkcUTvty1vPNo5rR3eF/bKdCvq2yOp gYptygBDQuQqMWpCwXCYvH18XB1XKmt9+18UG2wfpTaEx4fl0Q8T44fQt4+M5grffQ CnDTRs4F01lgOr5M74r0mtnzDvl6a+Fg5hDwKvCGexafBdqcBskhClnHrE11J0UEsd ahJh9IBIgE91w== Message-ID: Subject: Re: [PATCH v5 0/7] Automatic NFSv4 state revocation on filesystem unmount 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 08:18:21 -0400 In-Reply-To: <20260326-umount-kills-nfsv4-state-v5-0-d2ce071b3570@oracle.com> References: <20260326-umount-kills-nfsv4-state-v5-0-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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filesystem and clients hold NFSv4 > state (opens, locks, delegations), unmounting the underlying > filesystem fails with EBUSY. The /proc/fs/nfsd/unlock_ip and > /proc/fs/nfsd/unlock_fs procfs interfaces handle this, but have > no netlink equivalents, and unlock_fs operates at whole-superblock > granularity. >=20 > This series adds three new NFSD netlink commands, each with its own > attribute set: >=20 > - NFSD_CMD_UNLOCK_IP releases NLM locks held by a client IP > address. Netlink equivalent of write_unlock_ip. >=20 > - NFSD_CMD_UNLOCK_FILESYSTEM revokes all NFS state on a > superblock. Netlink equivalent of write_unlock_fs. >=20 > - NFSD_CMD_UNLOCK_EXPORT revokes NFSv4 state acquired through > exports of a specific path, regardless of client. >=20 > UNLOCK_FILESYSTEM and UNLOCK_EXPORT serve different intents. > UNLOCK_FILESYSTEM means "unmounting /data, release everything > on this superblock." UNLOCK_EXPORT means "no clients remain for > /data/projectA, release only the state acquired through exports > of that path." Userspace (exportfs -u) sends UNLOCK_EXPORT after > removing the last client for a given path, enabling the underlying > filesystem to be unmounted. >=20 > The path-only design for UNLOCK_EXPORT avoids the auth_domain > naming complexity (use_ipaddr vs hostname-based domains) by not > requiring the caller to identify a specific client. Since this > mechanism is to be used to enable umount, this seemed like a > reasonable compromise. >=20 > --- > Changes since v4: > - 1/9 has been queued in nfsd-testing > - Split single NFSD_CMD_UNLOCK into three separate commands > - UNLOCK_EXPORT takes path only, no client attribute to avoid > auth_domain naming complexity with use_ipaddr >=20 > Changes since v3: > - All VFS changes replaced with new netlink "unlock" operation >=20 > Changes since v2: > - Replace fs_pin with an SRCU umount notifier chain in VFS > - Merge the pending COPY cancellation patch > - Replace xa_cmpxchg() with xa_insert() > - Use cancel_work_sync() instead of flush_workqueue() > - Remove rcu_barrier() > - Correct misleading claims in kdoc comments and commit messages >=20 > Changes since v1: > - Explain why drop_client() is being renamed > - Finish implementing revocation on umount > - Rename pin_insert_group > - Clarified log output and code comments > - Hold nfsd_mutex while closing nfsd_files >=20 > --- > Chuck Lever (7): > NFSD: Extract revoke_one_stid() utility function > NFSD: Add NFSD_CMD_UNLOCK_IP netlink command > NFSD: Add NFSD_CMD_UNLOCK_FILESYSTEM netlink command > NFSD: Replace idr_for_each_entry_ul in find_one_sb_stid() > NFSD: Track svc_export in nfs4_stid > NFSD: Add NFSD_CMD_UNLOCK_EXPORT netlink command > NFSD: Close cached file handles when revoking export state >=20 > Documentation/netlink/specs/nfsd.yaml | 61 +++++++++ > fs/nfsd/filecache.c | 46 +++++++ > fs/nfsd/filecache.h | 1 + > fs/nfsd/netlink.c | 36 ++++++ > fs/nfsd/netlink.h | 3 + > fs/nfsd/nfs4layouts.c | 2 + > fs/nfsd/nfs4state.c | 226 +++++++++++++++++++++++-----= ------ > fs/nfsd/nfsctl.c | 126 ++++++++++++++++++- > fs/nfsd/state.h | 6 + > fs/nfsd/trace.h | 32 ++++- > include/uapi/linux/nfsd_netlink.h | 24 ++++ > 11 files changed, 484 insertions(+), 79 deletions(-) > --- > base-commit: 65058e9e9b20619f920397f529072e853dd43811 > change-id: 20260318-umount-kills-nfsv4-state-138218f2f4e0 >=20 > Best regards, > -- =20 > Chuck Lever This all looks good to me. A couple of minor nits, but nothing that looks wrong. I know you intend to use exportfs to drive the UNLOCK_EXPORT. What are your plans for the userland bits to drive the other two commands? Reviewed-by: Jeff Layton