From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 15EA52E06E6; Fri, 22 May 2026 19:53:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779479591; cv=none; b=TTrt/QemDuBrM3pCRQCZAHevwtDwp1VJZLZDQV0I6AAgdKLJvP+1Q68VHV7N6y94iB9EIAW+LyTJ6I7WsW3SW/vjEV5zD/SCg5MuTgnieIZqPJAfHmFNGLzLEvZbc5pC9kHe5svzieHq7g0UBLIeUpNxuGBBUTePEN60ZrdJO+c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779479591; c=relaxed/simple; bh=8L7A5yvtv5odlWgX8ggavxCCajq4Pa5iPIiuihkYwwo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DLQg7S1EYl3jsVWteP1NUN6VB++VUgBthluFMZXYi65IEl2ufK2sgFMQTqvbiLbt/ceUfQADZoozytT47Z+r5R+PJM4J9tAYoraZnnBafbYh4S9IZL7DCCuNo9EAMx8xkUXqLUsRMIhHMougvpVIAPaNV8JlaNo93xX3n7kX6zs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ocgnYNM0; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ocgnYNM0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 014E71F000E9; Fri, 22 May 2026 19:53:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779479589; bh=rwn8PP3GLiLui5mhj9r+A2LVnmLjyq4C23sfmGD2Oig=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=ocgnYNM0eymLn/m0b2Y/FN24tWBX6z71s49bZkl3Tu6y8sFtPkU35XbzH/ikCllR0 SAqiKhw4LejWxKyXVMtuwDMW9yJEKNnvTjWswBxnC+mgriw66hWZ+zO+YHV+ROsjY/ 25NPmEjNWtlRjOjQ+LBd8KvPJW8eFEFR87dPCNftPBtdAF7nHu+2fQKHBvk+60A2gw qe9xzXPVE5uk4fUBwCbKSE7uRPhzwfE+wQZ6tIGQiYZW1qpw01RAs9/V9aGM+OWkiS +H3uzYhmwcGE1mJTkS1dBOvRUgYmBvlPgnWIAjrIZhSfxfrEQ5TxkBj0xBqjbnQQnW L86vHzsp0wQ3w== Message-ID: Subject: Re: [PATCH] nfsd: reset write verifier when async COPY writeback fails From: Jeff Layton To: Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, Chuck Lever , stable@vger.kernel.org Date: Fri, 22 May 2026 15:53:07 -0400 In-Reply-To: <20260522194441.436065-1-cel@kernel.org> References: <20260522194441.436065-1-cel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV 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via CB_OFFLOAD after the worker kthread completes. When > the post-copy vfs_fsync_range() or filemap_check_wb_err() in > _nfsd_copy_file_range() reports an error, the worker correctly > leaves NFSD4_COPY_F_COMMITTED clear so that CB_OFFLOAD encodes > wr_stable_how as NFS_UNSTABLE, but the server's write verifier is > not rotated. >=20 > A client that receives NFS_UNSTABLE in CB_OFFLOAD follows up with > COMMIT to make the copied data durable. With the verifier > unchanged, COMMIT returns the same value the client just received > via CB_OFFLOAD, and the client concludes the copy is durable -- > silently dropping the data whose writeback in fact failed. This > violates the UNSTABLE+COMMIT durability contract (RFC 7862 section > 15.1, RFC 8881 section 18.32) and matches the bug just fixed in > nfsd_vfs_write() and nfsd_commit(). >=20 > Rotate nn->writeverf at the writeback-failure site. The async COPY > worker has no svc_rqst, so commit_reset_write_verifier() is not > available here; calling nfsd_reset_write_verifier() directly > mirrors the trace-less reset already used by > nfsd_file_check_write_error() for the same purpose. >=20 > Fixes: eac0b17a77fb ("NFSD add vfs_fsync after async copy is done") > Cc: stable@vger.kernel.org > Assisted-by: kres:claude-opus-4-7 > Signed-off-by: Chuck Lever > --- > fs/nfsd/nfs4proc.c | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c > index 8561540ab2db..26f09e2ac4f3 100644 > --- a/fs/nfsd/nfs4proc.c > +++ b/fs/nfsd/nfs4proc.c > @@ -1972,6 +1972,8 @@ static ssize_t _nfsd_copy_file_range(struct nfsd4_c= opy *copy, > status =3D filemap_check_wb_err(dst->f_mapping, since); > if (!status) > set_bit(NFSD4_COPY_F_COMMITTED, ©->cp_flags); > + else > + nfsd_reset_write_verifier(copy->cp_nn); > } > return bytes_copied; > } commit_reset_write_verifier() filters out EAGAIN and ENOSPC. Do we need the same filter here? --=20 Jeff Layton