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 0E677221267; Wed, 9 Jul 2025 19:32:49 +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=1752089569; cv=none; b=aRkcslMz59u7f3he1RECYIjWFwuzy97h6vvXEkvDPOaRz3LxuRCjf3nGkIM6E3Osr/Fhh8yU/1pM39NJ1eadsBp/LEHuhj4TXDzifzQQP45a6bGENExeyVrKgHX+enCGonYn7vYslCrf3K06mmMCro8VLRom7713JkBOa9gcasU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752089569; c=relaxed/simple; bh=4LDEX8FWAtt6j0hPu9Yy4d8T88aWnDqbn/gHLd3bQg0=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=CPIpDAPggk/c3Ne+auPhTa9zP1hqK9HTXGbh6374XYwTOPu+k1RiuQGtGoGOF726Ua4WkYpLkzUOMFg/StrMbBdPCzEXcnVG0ODq0PiAEjrgpnK5V10xyzqiHJMin4ErbmBiD2ZqTM2+sV62VkmUKWDySIOKyAcmpwpaCGvzacs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=C9Kga8Am; 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="C9Kga8Am" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 449C9C4CEEF; Wed, 9 Jul 2025 19:32:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752089568; bh=4LDEX8FWAtt6j0hPu9Yy4d8T88aWnDqbn/gHLd3bQg0=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=C9Kga8AmWLIA4AB75RcUCXoMnEqSZZE3s5qtbvAu+ulliSZ8y45ysVf+Y79cUrk1r Tp/61lbic9hwkPcQ4nUjpre0i0Zt/0u17fbUMxKRn5X3wg1S0IA3R6DC3q+nOSfzEU 3GnKNHbOd2VgNp+AYWL52zTmBHKhRTsptdZv+bnH1QIlSDjGMKPVRzqDNORtdWjhVm b5SHqHN3ImSQY+cklf+3vTBU9aBFMJt8A3wX1v+0WtE7trvqTR0Q/30DIpW9NdVKA1 NtfdlyJcIs4jBeowJBik3LQY5DCMpdUkvDFuhpf3cewSJ71gXzti1avdfl0IvYtGSY nxXJu2pdlcDyg== Message-ID: Subject: Re: [PATCH v2] NFS: Fixup allocation flags for nfsiod's __GFP_NORETRY From: Jeff Layton To: Benjamin Coddington , Trond Myklebust , Anna Schumaker Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Laurence Oberman Date: Wed, 09 Jul 2025 15:32:47 -0400 In-Reply-To: <9148ead966dbd7768d6dd832b61a8f1d93f43669.1752072235.git.bcodding@redhat.com> References: <9148ead966dbd7768d6dd832b61a8f1d93f43669.1752072235.git.bcodding@redhat.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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is doing writeback from a workqueue context, avoid usin= g > __GFP_NORETRY for allocations if the task has set PF_MEMALLOC_NOIO or > PF_MEMALLOC_NOFS. The combination of these flags makes memory allocation > failures much more likely. >=20 > We've seen those allocation failures show up when the loopback driver is > doing writeback from a workqueue to a file on NFS, where memory allocatio= n > failure results in errors or corruption within the loopback device's > filesystem. >=20 > Suggested-by: Trond Myklebust > Fixes: 0bae835b63c5 ("NFS: Avoid writeback threads getting stuck in mempo= ol_alloc()") > Signed-off-by: Benjamin Coddington > Reviewed-by: Laurence Oberman > Tested-by: Laurence Oberman > --- >=20 > On V2: add missing 'Fixes' and Laurence's R-b T-b >=20 > fs/nfs/internal.h | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) >=20 > diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h > index 69c2c10ee658..7f3213607431 100644 > --- a/fs/nfs/internal.h > +++ b/fs/nfs/internal.h > @@ -671,9 +671,12 @@ nfs_write_match_verf(const struct nfs_writeverf *ver= f, > =20 > static inline gfp_t nfs_io_gfp_mask(void) > { > - if (current->flags & PF_WQ_WORKER) > - return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; > - return GFP_KERNEL; > + gfp_t ret =3D current_gfp_context(GFP_KERNEL); > + > + /* For workers __GFP_NORETRY only with __GFP_IO or __GFP_FS */ > + if ((current->flags & PF_WQ_WORKER) && ret =3D=3D GFP_KERNEL) > + return ret |=3D __GFP_NORETRY | __GFP_NOWARN; > + return ret; > } > =20 > /* This way works too! Reviewed-by: Jeff Layton