From patchwork Wed Jun 10 20:13:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 11598739 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 28800138C for ; Wed, 10 Jun 2020 20:16:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FCE320842 for ; Wed, 10 Jun 2020 20:16:51 +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="KUjUe2Eh" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730893AbgFJUQf (ORCPT ); Wed, 10 Jun 2020 16:16:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730543AbgFJUNt (ORCPT ); Wed, 10 Jun 2020 16:13:49 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C0BDC008744; Wed, 10 Jun 2020 13:13:48 -0700 (PDT) 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=RjoGa99XdcmVsHZZNtbX8kRo95MxAX4SaxcEuGmYN1E=; b=KUjUe2EhH1YNoqavI3yyeilX1v AIg9ZnYh349tXQaVUhDpoG2x1xeIRoPraIhW1SltAfmuALJ/GOA1nB+f5BrXqXIFvS3lzpwzB0Zif 7qimYe6y4IaiDQQPu+e60gSu+BJhi9oGwaO7UsGAFUSPiEUGSK02SyWrw4cBI8OrS5u3jvMrKiJ5X qo4bzCcQ5JLAJ16cEp3cBISjz6gk9X95Tc4XH75Uvs7YLr85Toyw6tEjPGrJN5OEQgvvx9KhyV/D/ DQhnNlURXvhxqU+2k/m5VMD72BPFikRsn4xKcWVD3ixS37XhL8hFUta9Y+gDVwnwtTKB2WN9E/7QQ +IxgPI8Q==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jj76a-0003V7-2z; Wed, 10 Jun 2020 20:13:48 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 22/51] iomap: Support arbitrarily many blocks per page Date: Wed, 10 Jun 2020 13:13:16 -0700 Message-Id: <20200610201345.13273-23-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200610201345.13273-1-willy@infradead.org> References: <20200610201345.13273-1-willy@infradead.org> MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: "Matthew Wilcox (Oracle)" Size the uptodate array dynamically. Now that this array is protected by a spinlock, we can use bitmap functions to set the bits in this array instead of a loop around set_bit(). Signed-off-by: Matthew Wilcox (Oracle) --- fs/iomap/buffered-io.c | 25 ++++++++----------------- 1 file changed, 8 insertions(+), 17 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 4d3d0abc1421..1a398af42ed2 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -22,14 +22,14 @@ #include "../internal.h" /* - * Structure allocated for each page when block size < PAGE_SIZE to track + * Structure allocated for each page when block size < page size to track * sub-page uptodate status and I/O completions. */ struct iomap_page { atomic_t read_count; atomic_t write_count; spinlock_t uptodate_lock; - DECLARE_BITMAP(uptodate, PAGE_SIZE / 512); + unsigned long uptodate[]; }; static inline struct iomap_page *to_iomap_page(struct page *page) @@ -45,15 +45,14 @@ static struct iomap_page * iomap_page_create(struct inode *inode, struct page *page) { struct iomap_page *iop = to_iomap_page(page); + unsigned int nr_blocks = i_blocks_per_page(inode, page); - if (iop || i_blocks_per_page(inode, page) <= 1) + if (iop || nr_blocks <= 1) return iop; - iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL); - atomic_set(&iop->read_count, 0); - atomic_set(&iop->write_count, 0); + iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)), + GFP_NOFS | __GFP_NOFAIL); spin_lock_init(&iop->uptodate_lock); - bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE); /* * migrate_page_move_mapping() assumes that pages with private data have @@ -142,19 +141,11 @@ iomap_iop_set_range_uptodate(struct page *page, unsigned off, unsigned len) struct inode *inode = page->mapping->host; unsigned first = off >> inode->i_blkbits; unsigned last = (off + len - 1) >> inode->i_blkbits; - bool uptodate = true; unsigned long flags; - unsigned int i; spin_lock_irqsave(&iop->uptodate_lock, flags); - for (i = 0; i < i_blocks_per_page(inode, page); i++) { - if (i >= first && i <= last) - set_bit(i, iop->uptodate); - else if (!test_bit(i, iop->uptodate)) - uptodate = false; - } - - if (uptodate) + bitmap_set(iop->uptodate, first, last - first + 1); + if (bitmap_full(iop->uptodate, i_blocks_per_page(inode, page))) SetPageUptodate(page); spin_unlock_irqrestore(&iop->uptodate_lock, flags); }