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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 08C5AC3B189 for ; Wed, 12 Feb 2020 04:19:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C0CCB20848 for ; Wed, 12 Feb 2020 04:19:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Mzmo0k/a" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C0CCB20848 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 37DEB6B03AD; Tue, 11 Feb 2020 23:18:50 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 09DD16B03A0; Tue, 11 Feb 2020 23:18:49 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 79CFD6B03A0; Tue, 11 Feb 2020 23:18:49 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0240.hostedemail.com [216.40.44.240]) by kanga.kvack.org (Postfix) with ESMTP id 94A8F6B03AA for ; Tue, 11 Feb 2020 23:18:48 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 3E431181AEF10 for ; Wed, 12 Feb 2020 04:18:48 +0000 (UTC) X-FDA: 76480169136.01.actor44_129d84296df3a X-HE-Tag: actor44_129d84296df3a X-Filterd-Recvd-Size: 5004 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf16.hostedemail.com (Postfix) with ESMTP for ; Wed, 12 Feb 2020 04:18:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=OHiH3KAgiS8rCXh8VJ0556v4ieZAW8VpEHQUzRQYEA4=; b=Mzmo0k/aq/GOLignpIcekDR9ml +jfxQ5r99fcTR6tkjKnQv+GQzMNXmc1WCJ/KNHxG8Ve3zMTQOW7l6i1FbOfnKUZI3Eiw5yhla3ueI 4FfrnVuwbS4gv0rvuZ18fFl0Euri8VR5EPuXEGBEDeAcPvpg5GTjUj60tLCPgl1Nw54UJqhAHdv8J ZfNRECkJVehwyOcfB2jd5qI1K47e7PzpVG0LUyaRIm/FokguXb3RRqxW7pFJsuk7FQ1D5aVxZP+lr 32PV2qGten9T2IY8nyUPJKyF9akRp/1wZ/4x0PfXzZR6tRcDH/B3GpgY4cadVwioBtChkzABhkqI0 7bOQ4Uuw==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1j1jU7-0006oB-4o; Wed, 12 Feb 2020 04:18:47 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v2 16/25] iomap: Support large pages in read paths Date: Tue, 11 Feb 2020 20:18:36 -0800 Message-Id: <20200212041845.25879-17-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200212041845.25879-1-willy@infradead.org> References: <20200212041845.25879-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: From: "Matthew Wilcox (Oracle)" Use thp_size() instead of PAGE_SIZE, use offset_in_this_page() and abstract away how to access the list of readahead pages. Signed-off-by: Matthew Wilcox (Oracle) --- fs/iomap/buffered-io.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index e522039f627f..68f8903ecd6d 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -179,14 +179,16 @@ iomap_read_finish(struct iomap_page *iop, struct pa= ge *page) static void iomap_read_page_end_io(struct bio_vec *bvec, int error) { - struct page *page =3D bvec->bv_page; + struct page *page =3D compound_head(bvec->bv_page); struct iomap_page *iop =3D to_iomap_page(page); + unsigned offset =3D bvec->bv_offset + + PAGE_SIZE * (bvec->bv_page - page); =20 if (unlikely(error)) { ClearPageUptodate(page); SetPageError(page); } else { - iomap_set_range_uptodate(page, bvec->bv_offset, bvec->bv_len); + iomap_set_range_uptodate(page, offset, bvec->bv_len); } =20 iomap_read_finish(iop, page); @@ -239,6 +241,16 @@ static inline bool iomap_block_needs_zeroing(struct = inode *inode, pos >=3D i_size_read(inode); } =20 +/* + * Estimate the number of vectors we need based on the current page size= ; + * if we're wrong we'll end up doing an overly large allocation or needi= ng + * to do a second allocation, neither of which is a big deal. + */ +static unsigned int iomap_nr_vecs(struct page *page, loff_t length) +{ + return (length + thp_size(page) - 1) >> page_shift(page); +} + static loff_t iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, voi= d *data, struct iomap *iomap, struct iomap *srcmap) @@ -263,7 +275,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos,= loff_t length, void *data, goto done; =20 if (iomap_block_needs_zeroing(inode, iomap, pos)) { - zero_user(page, poff, plen); + zero_user_large(page, poff, plen); iomap_set_range_uptodate(page, poff, plen); goto done; } @@ -294,7 +306,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos,= loff_t length, void *data, =20 if (!ctx->bio || !is_contig || bio_full(ctx->bio, plen)) { gfp_t gfp =3D mapping_gfp_constraint(page->mapping, GFP_KERNEL); - int nr_vecs =3D (length + PAGE_SIZE - 1) >> PAGE_SHIFT; + int nr_vecs =3D iomap_nr_vecs(page, length); =20 if (ctx->bio) submit_bio(ctx->bio); @@ -331,9 +343,9 @@ iomap_readpage(struct page *page, const struct iomap_= ops *ops) =20 trace_iomap_readpage(page->mapping->host, 1); =20 - for (poff =3D 0; poff < PAGE_SIZE; poff +=3D ret) { - ret =3D iomap_apply(inode, page_offset(page) + poff, - PAGE_SIZE - poff, 0, ops, &ctx, + for (poff =3D 0; poff < thp_size(page); poff +=3D ret) { + ret =3D iomap_apply(inode, file_offset_of_page(page) + poff, + thp_size(page) - poff, 0, ops, &ctx, iomap_readpage_actor); if (ret <=3D 0) { WARN_ON_ONCE(ret =3D=3D 0); @@ -376,7 +388,7 @@ iomap_readahead_actor(struct inode *inode, loff_t pos= , loff_t length, if (WARN_ON(ret =3D=3D 0)) break; done +=3D ret; - if (offset_in_page(pos + done) =3D=3D 0) { + if (offset_in_this_page(ctx->cur_page, pos + done) =3D=3D 0) { ctx->rac->nr_pages -=3D ctx->rac->batch_count; if (!ctx->cur_page_in_bio) unlock_page(ctx->cur_page); --=20 2.25.0