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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 8862D6B0266; Fri, 24 Jan 2020 20:36:00 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7C0E26B026B; Fri, 24 Jan 2020 20:36:00 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4638D6B000E; Fri, 24 Jan 2020 20:36:00 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0130.hostedemail.com [216.40.44.130]) by kanga.kvack.org (Postfix) with ESMTP id 0E3C66B0010 for ; Fri, 24 Jan 2020 20:36:00 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id C01AA824556B for ; Sat, 25 Jan 2020 01:35:59 +0000 (UTC) X-FDA: 76414440438.12.unit59_172f3148adb51 X-HE-Tag: unit59_172f3148adb51 X-Filterd-Recvd-Size: 6566 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf05.hostedemail.com (Postfix) with ESMTP for ; Sat, 25 Jan 2020 01:35:59 +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:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=HHnoA5dlhyhneD6+Obykceh6U0fhtgzOm0Z80uarkuw=; b=F+6jSwd5w3xYt/eqTfmrV4G1O5 n1Hp/wxUv5nlFPpKyBIJ7sAWu5aSuYikwpOTQBYk38RZGa+NPovOEXyenAMkxLMlJETHfJPr7GaQ8 nGwH0CEKtEZ/zB82686JHeybpxdixbocJIKONd5GBoIL5dWemPivB3fFz6onPtGGrSYT3mI2K570J HspG26VYHDwRFNXMP6ZohqOmpwjoQmA3xKnSQFLzFFCIwNHzq5EfgBIspMZNuy/MQL6Noz3vYUSM1 H1sJkK/f3tiDZJCl01yXtZftlJ+oRv/qPuRXc2Vq8a3BF388m516PTRwxfdsf+fiObg3f9HUwX3p9 lF81g+Ew==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1ivAMd-0006Va-CG; Sat, 25 Jan 2020 01:35:55 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH 06/12] btrfs: Convert from readpages to readahead Date: Fri, 24 Jan 2020 17:35:47 -0800 Message-Id: <20200125013553.24899-7-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200125013553.24899-1-willy@infradead.org> References: <20200125013553.24899-1-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 the new readahead operation in btrfs Signed-off-by: Matthew Wilcox (Oracle) Cc: linux-btrfs@vger.kernel.org --- fs/btrfs/extent_io.c | 15 ++++----------- fs/btrfs/extent_io.h | 2 +- fs/btrfs/inode.c | 18 +++++++++--------- 3 files changed, 14 insertions(+), 21 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 2f4802f405a2..b1e2acbec165 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4283,7 +4283,7 @@ int extent_writepages(struct address_space *mapping= , return ret; } =20 -int extent_readpages(struct address_space *mapping, struct list_head *pa= ges, +unsigned extent_readahead(struct address_space *mapping, pgoff_t start, unsigned nr_pages) { struct bio *bio =3D NULL; @@ -4294,20 +4294,13 @@ int extent_readpages(struct address_space *mappin= g, struct list_head *pages, int nr =3D 0; u64 prev_em_start =3D (u64)-1; =20 - while (!list_empty(pages)) { + while (nr_pages) { u64 contig_end =3D 0; =20 - for (nr =3D 0; nr < ARRAY_SIZE(pagepool) && !list_empty(pages);) { - struct page *page =3D lru_to_page(pages); + for (nr =3D 0; nr < ARRAY_SIZE(pagepool) && nr_pages--;) { + struct page *page =3D readahead_page(mapping, start++); =20 prefetchw(&page->flags); - list_del(&page->lru); - if (add_to_page_cache_lru(page, mapping, page->index, - readahead_gfp_mask(mapping))) { - put_page(page); - break; - } - pagepool[nr++] =3D page; contig_end =3D page_offset(page) + PAGE_SIZE - 1; } diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index a8551a1f56e2..d0f154766a02 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -200,7 +200,7 @@ int extent_writepages(struct address_space *mapping, struct writeback_control *wbc); int btree_write_cache_pages(struct address_space *mapping, struct writeback_control *wbc); -int extent_readpages(struct address_space *mapping, struct list_head *pa= ges, +unsigned extent_readahead(struct address_space *mapping, pgoff_t start, unsigned nr_pages); int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinf= o, __u64 start, __u64 len); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c70baafb2a39..4f223b4f7dff 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5395,8 +5395,8 @@ static void evict_inode_truncate_pages(struct inode= *inode) =20 /* * Keep looping until we have no more ranges in the io tree. - * We can have ongoing bios started by readpages (called from readahead= ) - * that have their endio callback (extent_io.c:end_bio_extent_readpage) + * We can have ongoing bios started by readahead that have + * their endio callback (extent_io.c:end_bio_extent_readpage) * still in progress (unlocked the pages in the bio but did not yet * unlocked the ranges in the io tree). Therefore this means some * ranges can still be locked and eviction started because before @@ -7586,11 +7586,11 @@ static int lock_extent_direct(struct inode *inode= , u64 lockstart, u64 lockend, * for it to complete) and then invalidate the pages for * this range (through invalidate_inode_pages2_range()), * but that can lead us to a deadlock with a concurrent - * call to readpages() (a buffered read or a defrag call + * call to readahead (a buffered read or a defrag call * triggered a readahead) on a page lock due to an * ordered dio extent we created before but did not have * yet a corresponding bio submitted (whence it can not - * complete), which makes readpages() wait for that + * complete), which makes readahead wait for that * ordered extent to complete while holding a lock on * that page. */ @@ -8829,11 +8829,11 @@ static int btrfs_writepages(struct address_space = *mapping, return extent_writepages(mapping, wbc); } =20 -static int -btrfs_readpages(struct file *file, struct address_space *mapping, - struct list_head *pages, unsigned nr_pages) +static unsigned +btrfs_readahead(struct file *file, struct address_space *mapping, + pgoff_t start, unsigned nr_pages) { - return extent_readpages(mapping, pages, nr_pages); + return extent_readahead(mapping, start, nr_pages); } =20 static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) @@ -11045,7 +11045,7 @@ static const struct address_space_operations btrf= s_aops =3D { .readpage =3D btrfs_readpage, .writepage =3D btrfs_writepage, .writepages =3D btrfs_writepages, - .readpages =3D btrfs_readpages, + .readahead =3D btrfs_readahead, .direct_IO =3D btrfs_direct_IO, .invalidatepage =3D btrfs_invalidatepage, .releasepage =3D btrfs_releasepage, --=20 2.24.1