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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4CE4C4321E for ; Wed, 18 May 2022 23:37:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 732C86B0082; Wed, 18 May 2022 19:37:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 553358D0001; Wed, 18 May 2022 19:37:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2E4486B0083; Wed, 18 May 2022 19:37:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 1DCE46B0081 for ; Wed, 18 May 2022 19:37:42 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id EF6AA31DD1 for ; Wed, 18 May 2022 23:37:41 +0000 (UTC) X-FDA: 79480478322.03.FBF0D8B Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by imf30.hostedemail.com (Postfix) with ESMTP id 866298000A for ; Wed, 18 May 2022 23:37:17 +0000 (UTC) Received: from pps.filterd (m0089730.ppops.net [127.0.0.1]) by m0089730.ppops.net (8.17.1.5/8.17.1.5) with ESMTP id 24INKaEP016569 for ; Wed, 18 May 2022 16:37:41 -0700 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=fdXvE+WWGkZbdDWaaWcycrFeF07NZ6/Rt8YdakSfT7c=; b=obXWAbHm9xVuJ4SSxrm0Tz5QiPhr9yomkEgpd2BpiO4WjPjtVfdP+NfmD/+Rahtfr1qE BVQPaeHZ3q0u27VHwxJLnznlMx+U2+rjgmOF3SLios3XkSHoZoRaq4K6lLVRLtfeHEmO yIrXm1iQDSdjidF4EICsYYmEwEsXycHESaI= Received: from mail.thefacebook.com ([163.114.132.120]) by m0089730.ppops.net (PPS) with ESMTPS id 3g5acy02tm-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 18 May 2022 16:37:40 -0700 Received: from twshared35748.07.ash9.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:21d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Wed, 18 May 2022 16:37:39 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id EBEC6F3ED867; Wed, 18 May 2022 16:37:12 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , Subject: [RFC PATCH v3 11/18] io_uring: Add support for async buffered writes Date: Wed, 18 May 2022 16:37:02 -0700 Message-ID: <20220518233709.1937634-12-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220518233709.1937634-1-shr@fb.com> References: <20220518233709.1937634-1-shr@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: EHCqHe1DFKv46Hs_X-28YduY1UWzEH8x X-Proofpoint-GUID: EHCqHe1DFKv46Hs_X-28YduY1UWzEH8x X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-18_06,2022-05-17_02,2022-02-23_01 X-Rspamd-Queue-Id: 866298000A X-Stat-Signature: kx9fcadkfhjgr86n9rfcw5z6178bw3j1 Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=fb.com header.s=facebook header.b=obXWAbHm; dmarc=pass (policy=reject) header.from=fb.com; spf=none (imf30.hostedemail.com: domain of "prvs=6137e46c81=shr@fb.com" has no SPF policy when checking 67.231.153.30) smtp.mailfrom="prvs=6137e46c81=shr@fb.com" X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1652917037-102610 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This enables the async buffered writes for the filesystems that support async buffered writes in io-uring. Buffered writes are enabled for blocks that are already in the page cache or can be acquired with noio. Signed-off-by: Stefan Roesch --- fs/io_uring.c | 29 ++++++++++++++++++++++++----- 1 file changed, 24 insertions(+), 5 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 91de361ea9ab..f3aaac286509 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3746,7 +3746,7 @@ static inline int io_iter_do_read(struct io_kiocb *= req, struct iov_iter *iter) return -EINVAL; } =20 -static bool need_read_all(struct io_kiocb *req) +static bool need_complete_io(struct io_kiocb *req) { return req->flags & REQ_F_ISREG || S_ISBLK(file_inode(req->file)->i_mode); @@ -3875,7 +3875,7 @@ static int io_read(struct io_kiocb *req, unsigned i= nt issue_flags) } else if (ret =3D=3D -EIOCBQUEUED) { goto out_free; } else if (ret =3D=3D req->result || ret <=3D 0 || !force_nonblock || - (req->flags & REQ_F_NOWAIT) || !need_read_all(req)) { + (req->flags & REQ_F_NOWAIT) || !need_complete_io(req)) { /* read all, failed, already did sync or don't want to retry */ goto done; } @@ -3971,9 +3971,10 @@ static int io_write(struct io_kiocb *req, unsigned= int issue_flags) if (unlikely(!io_file_supports_nowait(req))) goto copy_iov; =20 - /* file path doesn't support NOWAIT for non-direct_IO */ - if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) && - (req->flags & REQ_F_ISREG)) + /* File path supports NOWAIT for non-direct_IO only for block devices.= */ + if (!(kiocb->ki_flags & IOCB_DIRECT) && + !(kiocb->ki_filp->f_mode & FMODE_BUF_WASYNC) && + (req->flags & REQ_F_ISREG)) goto copy_iov; =20 kiocb->ki_flags |=3D IOCB_NOWAIT; @@ -4027,6 +4028,24 @@ static int io_write(struct io_kiocb *req, unsigned= int issue_flags) /* IOPOLL retry should happen for io-wq threads */ if (ret2 =3D=3D -EAGAIN && (req->ctx->flags & IORING_SETUP_IOPOLL)) goto copy_iov; + + if (ret2 !=3D req->result && ret2 >=3D 0 && need_complete_io(req)) { + struct io_async_rw *rw; + + /* This is a partial write. The file pos has already been + * updated, setup the async struct to complete the request + * in the worker. Also update bytes_done to account for + * the bytes already written. + */ + iov_iter_save_state(&s->iter, &s->iter_state); + ret =3D io_setup_async_rw(req, iovec, s, true); + + rw =3D req->async_data; + if (rw) + rw->bytes_done +=3D ret2; + + return ret ? ret : -EAGAIN; + } done: kiocb_done(req, ret2, issue_flags); } else { --=20 2.30.2