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 52929277026; Fri, 22 May 2026 19:00:15 +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=1779476441; cv=none; b=I0CJWvDfzByLupkdGE1ba2Dc4GIsrEDh1OAMf/Y2er/iw2m2dMguCISF1bJm83Rx+TBuKoT8tewyyhtmnN0ghpFXNe90Uc93IGpX0jUl21bjlw6Avz4VbDC495A37Marg7syzBPLofvMX7kO2r56A12JEMQXNtHCcxzOYS5N0qs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779476441; c=relaxed/simple; bh=XruBWKXJnO3s5Nly/PiYkYXoAhCfDQpbeB/vzAqnJ9E=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=D1MCMCBgekEV40ivYZCZMqr+lfrGEGfEVoSkDrozXNyBBDXKn/SIpgBxXlgSfRIriEitGLUWkDtlFpXIHLkEbBWLgoRtEiR+8rPlSbzKHrBbVrPLD7IvcfEeZfN88dbSrrOiud3K3eBsDyPhHcYRilxib1/Lp0bgP7ODdHHVvG0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NuMU+mmp; 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="NuMU+mmp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D23381F000E9; Fri, 22 May 2026 19:00:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779476415; bh=DY3RrpeWbDg1e3/KetNYOLhHnR7ArSpOKoKhU9FTYJw=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=NuMU+mmpBqt/PWbGcGZMLqFMpXK12xgniMDFyxR4gpUR4f51K2KNdyhkpKLvHO7Um 2Wsh2mBdq6/PhVflyoemfH9giI8q1xZpVXj5+9acxXo/g6oodLfI/uh7jMOgKldyBb baFgeBiYj5v2IjT7hESGBD3y/NHoLNXCaRN+QpmlXCxokFQmfCeJDKNI7rqe948JJQ I6WWhFZ+BJ01yRcUtZRlgW0Od2e/PfPZprxY5tOXi0jfUgn2cKwtDHhSabOa8jV/+I ThZm2aYdCCmEhVNs4DlJLN+aSSL0pczMENt8oreyIbboWBr3kDI9IWUotwVzawfVdO cWBZdBoJbKHCg== Message-ID: <7de3480f4ae0bb5d2021c428fff728aec50c90a7.camel@kernel.org> Subject: Re: [PATCH] nfsd: reset write verifier on deferred writeback errors From: Jeff Layton To: Chuck Lever , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Chris Mason Date: Fri, 22 May 2026 15:00:12 -0400 In-Reply-To: References: <20260522-missing_verifier_reset_on_wb_err-v1-1-bf9f427f9b26@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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2026, at 12:44 PM, Jeff Layton wrote: > > nfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to > > detect deferred writeback errors, but neither rotates the server's writ= e > > verifier (nn->writeverf) when this check fails. Every other > > durable-storage-failure path in these functions calls > > commit_reset_write_verifier() before returning an error. > >=20 > > The missing rotation means clients holding UNSTABLE write data under th= e > > current verifier will COMMIT, receive the unchanged verifier back, and > > conclude their data is durable =E2=80=94 silently dropping data that fa= iled > > writeback. This violates the UNSTABLE+COMMIT durability contract > > (RFC 1813 =C2=A73.3.7, RFC 8881 =C2=A718.32). > >=20 > > Add commit_reset_write_verifier() calls at both filemap_check_wb_err() > > error sites, matching the pattern used by adjacent error paths in the > > same functions. The helper already filters -EAGAIN and -ESTALE > > internally, so the calls are unconditionally safe. > >=20 > > Reported-by: Chris Mason > > Assisted-by: kres:claude-opus-4-6 > > Signed-off-by: Jeff Layton > > --- > > fs/nfsd/vfs.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > >=20 > > diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c > > index cba473969429..7e6468bdc723 100644 > > --- a/fs/nfsd/vfs.c > > +++ b/fs/nfsd/vfs.c > > @@ -1513,8 +1513,10 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct= =20 > > svc_fh *fhp, > > nfsd_stats_io_write_add(nn, exp, *cnt); > > fsnotify_modify(file); > > host_err =3D filemap_check_wb_err(file->f_mapping, since); > > - if (host_err < 0) > > + if (host_err < 0) { > > + commit_reset_write_verifier(nn, rqstp, host_err); > > goto out_nfserr; > > + } > >=20 > > if (stable && fhp->fh_use_wgather) { > > host_err =3D wait_for_concurrent_writes(file); > > @@ -1694,6 +1696,8 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh= =20 > > *fhp, struct nfsd_file *nf, > > nfsd_copy_write_verifier(verf, nn); > > err2 =3D filemap_check_wb_err(nf->nf_file->f_mapping, > > since); > > + if (err2 < 0) > > + commit_reset_write_verifier(nn, rqstp, err2); > > err =3D nfserrno(err2); > > break; > > case -EINVAL: > >=20 > > --- > > base-commit: 6167e81847ba3adca17d8881ed9415beae993e2d > > change-id: 20260522-missing_verifier_reset_on_wb_err-480eb64a4ebe > >=20 > > Best regards, > > --=20 > > Jeff Layton >=20 > Do you have an additional fix pending that addresses the same bug > in the async COPY path? If not, I can post one. >=20 No, I don't. I didn't spot that one before. Handling it separately is probably good. That case isn't being called from nfsd context, so it'll need different handling. --=20 Jeff Layton