From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8AFE3C433EF for ; Mon, 14 Feb 2022 17:44:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357226AbiBNRoj (ORCPT ); Mon, 14 Feb 2022 12:44:39 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:34906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356631AbiBNRoi (ORCPT ); Mon, 14 Feb 2022 12:44:38 -0500 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 793E265487 for ; Mon, 14 Feb 2022 09:44:27 -0800 (PST) Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.1.2/8.16.1.2) with ESMTP id 21E9Zknj004107 for ; Mon, 14 Feb 2022 09:44:27 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=LSdyRHAc+fsIsWQJgyJviG9+Wzpmsxt7o7RJSYAE/qo=; b=a2NSIZRDQjUIc/rxJ19LXaDPQ1pgcWrQ8PPmaQ8O6UV7g2p3zJCPOt7WEQUXKDEpA3/X 7KfKna1RI81sgGaSsWMWHh6EeyXZwkS9V2FZ8jhdz93kE8EYaDOfxTfkIxDqQRZPOrm5 IKbCrCeR+PquW4gFE1y70dIoI7zvRMIjNNY= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3e7mk82u9b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 14 Feb 2022 09:44:27 -0800 Received: from twshared14630.35.frc1.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 14 Feb 2022 09:44:26 -0800 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 9B758ABBD0F9; Mon, 14 Feb 2022 09:44:09 -0800 (PST) From: Stefan Roesch To: , , , CC: Subject: [PATCH v1 03/14] mm: add noio support in filemap_get_pages Date: Mon, 14 Feb 2022 09:43:52 -0800 Message-ID: <20220214174403.4147994-4-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220214174403.4147994-1-shr@fb.com> References: <20220214174403.4147994-1-shr@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-GUID: Q5nS2Hbvs7Eo17PtgRkEo1oZXURBB7L3 X-Proofpoint-ORIG-GUID: Q5nS2Hbvs7Eo17PtgRkEo1oZXURBB7L3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-14_07,2022-02-14_03,2021-12-02_01 X-Proofpoint-Spam-Details: rule=fb_outbound_notspam policy=fb_outbound score=0 mlxscore=0 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 adultscore=0 spamscore=0 malwarescore=0 suspectscore=0 clxscore=1015 mlxlogscore=959 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202140105 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This adds noio support for async buffered writes in filemap_get_pages. The idea is to handle the failure gracefully and return -EAGAIN if we can't get the memory quickly. Signed-off-by: Stefan Roesch --- mm/filemap.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/filemap.c b/mm/filemap.c index d2fb817c0845..0ff4278c3961 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2591,10 +2591,15 @@ static int filemap_get_pages(struct kiocb *iocb, = struct iov_iter *iter, filemap_get_read_batch(mapping, index, last_index, fbatch); } if (!folio_batch_count(fbatch)) { + unsigned int pflags; + if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ)) - return -EAGAIN; + pflags =3D memalloc_noio_save(); err =3D filemap_create_folio(filp, mapping, iocb->ki_pos >> PAGE_SHIFT, fbatch); + if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_WAITQ)) + memalloc_noio_restore(pflags); + if (err =3D=3D AOP_TRUNCATED_PAGE) goto retry; return err; --=20 2.30.2