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 890BF1339BD; Wed, 6 Mar 2024 17:12:46 +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=1709745166; cv=none; b=VOIEYxDNasFK9gab8CvkKRYBuEj2qfTzKRlVLJ5Q428sGKnhSCR5dpbmh/xyEQ08OksTq5XdZ5CSXay/+x/Lmw+5agnYowfSNkF4KXCR5llXz4taoPYu4JJqk+kTfghQRRNdl8PDET70JCMTTsIs/bvs+K0cPg53cgTNBxFW/q4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709745166; c=relaxed/simple; bh=88er5smbCHgewnE6VSSwPcpk1Ubf0JcOZDegJtG4Blc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=V399+AhxE7IpVOWcVtP82KsPHa+oXKdiraOS3Jwm8mjMM9wGu6y3ZvxULbaa1mnQqxJ5E+09gHZ4PEMgvYWm7s0CI7T6/SkozUGL0MGGr3C1XLiUjW8IMDfVk+mmAALF1PezRe6tNc8TPhNguKTEdJDpqYMU4DCzA2Ep8Xv7S2Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e/9dkqpK; 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="e/9dkqpK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88973C433F1; Wed, 6 Mar 2024 17:12:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709745166; bh=88er5smbCHgewnE6VSSwPcpk1Ubf0JcOZDegJtG4Blc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=e/9dkqpKW4orr+gD1pvcTBqa78qEmQMD0XKA49oZSZSxvV+JIJjx7umNSj0zOBHEl RVdHNu6Kw21vmwa8SFIF5dVUiTrbKFHfSKzpA9PsZGNnjGoXho0pkefoy3Fb7kFQjH VxC3xbzCoeJE6WLw3/47j9hlpri2QEylFOL1lD+P9YIJT2Zt3lZAj8ZCXfuR95jJ92 NMbOB+vvdzgAeVd/8ZLeoltD8tvncdvnGFGXYa1MRnY5LUTWfsWL89G1bz1UaWIxdB jmJ4NOpfX6BZUOY70m9qz3oxTYnAOcnPot2MRVKEf6qPGm5211mHOFnG5x+Xxy6Req pQzwlyN8GjXUQ== Message-ID: Subject: Re: [PATCH stable 6.6 and 6.7] NFS: Fix data corruption caused by congestion. From: Jeff Layton To: NeilBrown , stable@vger.kernel.org, Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, Dan Aloni Date: Wed, 06 Mar 2024 12:12:44 -0500 In-Reply-To: References: <170907621128.24797.4390391329078744015@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2024-03-06 at 08:42 -0500, Jeff Layton wrote: > On Wed, 2024-02-28 at 10:23 +1100, NeilBrown wrote: > > when AOP_WRITEPAGE_ACTIVATE is returned (as NFS does when it detects > > congestion) it is important that the folio is redirtied. > > nfs_writepage_locked() doesn't do this, so files can become corrupted a= s > > writes can be lost. > >=20 > > Note that this is not needed in v6.8 as AOP_WRITEPAGE_ACTIVATE cannot b= e > > returned. It is needed for kernels v5.18..v6.7. Prior to 6.3 the patc= h > > is different as it needs to mention "page", not "folio". > >=20 >=20 > Neil, I have a question about the above statement. In Linus's tree as of > this morning (v6.8-rc7-ish), it does this in nfs_writepages_locked: >=20 > if (wbc->sync_mode =3D=3D WB_SYNC_NONE && > NFS_SERVER(inode)->write_congested) =20 > return AOP_WRITEPAGE_ACTIVATE; >=20 Sorry, I meant to say: The only caller of nfs_writepages_locked is nfs_wb_folio, and I don't see where it redirties the folio. Why don't we need this in v6.8? >=20 > > Reported-and-tested-by: Jacek Tomaka > > Fixes: 6df25e58532b ("nfs: remove reliance on bdi congestion") > > Signed-off-by: NeilBrown > > --- > > fs/nfs/write.c | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > >=20 > > diff --git a/fs/nfs/write.c b/fs/nfs/write.c > > index b664caea8b4e..9e345d3c305a 100644 > > --- a/fs/nfs/write.c > > +++ b/fs/nfs/write.c > > @@ -668,8 +668,10 @@ static int nfs_writepage_locked(struct folio *foli= o, > > int err; > > =20 > > if (wbc->sync_mode =3D=3D WB_SYNC_NONE && > > - NFS_SERVER(inode)->write_congested) > > + NFS_SERVER(inode)->write_congested) { > > + folio_redirty_for_writepage(wbc, folio); > > return AOP_WRITEPAGE_ACTIVATE; > > + } > > =20 > > nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); > > nfs_pageio_init_write(&pgio, inode, 0, false, >=20 --=20 Jeff Layton