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 EC32634575F; Wed, 18 Mar 2026 14:24:49 +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=1773843890; cv=none; b=gnVdlkhPwl37oNsUhebY9Y8c5e69hbUFyx04DYyQPQcvIZk1V/A2yA8w8mswMpyP/Ack0QS+RRrCX6NReXmGlRqyslpniDIsSEP/+DUdHIIGu+lUdtesxw+YIfL043xAZoIkOjJE0vGs5u0xSdcgIAgg4EzqUbhZmB7uUAMIiik= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773843890; c=relaxed/simple; bh=wzXCmo0mVvMidYXtOncEZpXnnYPqsWC1E8+yIW4ZPQQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=huXZ3gYNUQ2opXxk49tXAYkUG9HEbzt/x4Oy9k2prsm9eVUnhVOioCMdF/O5npngtN7HI+CIcS+2rHi6jOtO9JmD/MRHsT7zkO2axTbr+I/W0lAv6GS2krCBLeHPuj9UexfsjmBU9WQwoR6AzkUP/ZcjD1h/F+wbRI3rJW7HuOQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M8gkQrVB; 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="M8gkQrVB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DFEA1C19421; Wed, 18 Mar 2026 14:24:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773843889; bh=wzXCmo0mVvMidYXtOncEZpXnnYPqsWC1E8+yIW4ZPQQ=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=M8gkQrVBWCeO6ezgflD8KHpLGS9nGQ0+jNOtZfl6nuZLETp47iFeC1bauarLliQDh /vzWLU1+NiZrzgXe1E3x58QANVlkDC6x/7M2oRvQIqLR2u/jYmaBO+VCwWaM9kTp13 5LrcD4okGvrQMCDGPlqOzUrHw8Hl327TnE5+mLk4TehAiMaJHPqXUHOHktXlqukYYQ j66xBC7sLOX45Ksi7toMAXOi3og2D2CryKVizEZrwQuOK+PSKTOGeFMFGyH1odi7y+ Yy2+yZ7lszpgCqYmObIWBsQupEiZMQeuVONZQkiIDRS4bnfOvxjyWlq8A03u0EDk8V zK4xj5etAMRnA== Message-ID: <5addf0525656d06d57851a996ed6b127a6870585.camel@kernel.org> Subject: Re: [PATCH v4 0/6] 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: Wed, 18 Mar 2026 10:24:46 -0400 In-Reply-To: <20260318-umount-kills-nfsv4-state-v4-0-56aad44ab982@oracle.com> References: <20260318-umount-kills-nfsv4-state-v4-0-56aad44ab982@oracle.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Wed, 2026-03-18 at 10:15 -0400, Chuck Lever wrote: > When an NFS server exports a filesystem and clients hold NFSv4 > state (opens, locks, delegations), unmounting the underlying > filesystem fails with EBUSY. The /proc/fs/nfsd/unlock_fs procfs > interface revokes all NFSv4 state on a given filesystem's > superblock, but it operates at whole-filesystem granularity and > offers no structured way to extend the operation to other scopes. >=20 > This series adds an NFSD_CMD_UNLOCK netlink command that supports > typed, validated attributes and multiple scope values. The > initial "ip" scope provides a netlink equivalent of > write_unlock_ip, releasing NLM locks held by a specific client > address. A "filesystem" scope parallels write_unlock_fs, accepting > a path string and revoking NFSv4 state, NLM locks, async COPY > operations, and cached file handles associated with that path. >=20 > The filesystem scope revokes state at export granularity rather > than superblock granularity: when multiple exports share a > filesystem, only state referencing files under the specified > export root is affected. The subtree check walks all dentry > aliases of each inode so that hard-linked files outside the > export are not incorrectly matched. When the export root is the > filesystem root, the subtree check is elided. >=20 > The exportfs user space command can invoke NFSD_CMD_UNLOCK with > the filesystem scope after an explicit "exportfs -u", enabling > automated state cleanup without custom scripting or manual > procfs writes. >=20 I'll note that the mountd/exportd/exportfs nfs-utils patchset that I sent recently adds basic netlink support to exportfs. The userland bits for this should nestle on top of that nicely. > --- > 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 (6): > NFSD: Extract revoke_one_stid() utility function > NFSD: Add NFSD_CMD_UNLOCK netlink command with ip scope > NFSD: Add filesystem scope to NFSD_CMD_UNLOCK > NFSD: Refactor find_one_sb_stid() into find_next_sb_stid() > NFSD: Add export-scoped state revocation > NFSD: Add nfsd_file_close_export() for file cache cleanup >=20 > Documentation/netlink/specs/nfsd.yaml | 39 ++++++ > fs/nfsd/filecache.c | 77 ++++++++++++ > fs/nfsd/filecache.h | 2 + > fs/nfsd/netlink.c | 14 +++ > fs/nfsd/netlink.h | 1 + > fs/nfsd/nfs4state.c | 219 +++++++++++++++++++++-------= ------ > fs/nfsd/nfsctl.c | 105 +++++++++++++++- > fs/nfsd/state.h | 7 ++ > fs/nfsd/trace.h | 13 +- > include/uapi/linux/nfsd_netlink.h | 19 +++ > 10 files changed, 406 insertions(+), 90 deletions(-) > --- > base-commit: f338e77383789c0cae23ca3d48adcc5e9e137e3c > change-id: 20260318-umount-kills-nfsv4-state-138218f2f4e0 >=20 > Best regards, > -- =20 > Chuck Lever --=20 Jeff Layton