From patchwork Mon Aug 24 15:16:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 11733483 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 E8E8A13B1 for ; Mon, 24 Aug 2020 15:24:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D21C7207CD for ; Mon, 24 Aug 2020 15:24:46 +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="GB8FYN2i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727829AbgHXPYk (ORCPT ); Mon, 24 Aug 2020 11:24:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727798AbgHXPRZ (ORCPT ); Mon, 24 Aug 2020 11:17:25 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B96BC061795; Mon, 24 Aug 2020 08:17:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=eozBFwSKGPfBaW+jGggP/6aRg3H7QN0Z3eUiLt+WZqI=; b=GB8FYN2i+QVtGYzxtjTOv8TVE2 K4Td5UBppble8UOssfOfKNFyoA/jgO03nfOSAO5nyNyyvp2+N1iHaVqGVGSyLUGO1x/cSyT2Q+PPC szEmqvJN2lOfDMNC8hLLRbj/b/9gf/xyA/qOa0pJ7WvjtSnQOMKNxhFzPRFtvHJqKmBXcTK0V3oY2 /KVMc6hshLUZsQeW1JYTOQqnMTwv8VBh0i3/Z8GOkI//Z2YyJkJZmdbD2SGV5GrVD6MxYkPz8fd/9 6i2ACc6kA6VjWnJkf2pp1MgiRrm2KCt8V7rIC1uJOzJqruJkzk22pd7VRQEVYaiNQJU9A9Zl27kig hvfYk3qA==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kAEDX-0004Cy-IR; Mon, 24 Aug 2020 15:17:03 +0000 From: "Matthew Wilcox (Oracle)" To: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , "Darrick J . Wong" , linux-block@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/11] iomap: Support THPs in invalidatepage Date: Mon, 24 Aug 2020 16:16:55 +0100 Message-Id: <20200824151700.16097-7-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200824151700.16097-1-willy@infradead.org> References: <20200824151700.16097-1-willy@infradead.org> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org If we're punching a hole in a THP, we need to remove the per-page iomap data as the THP is about to be split and each page will need its own. This means that writepage can now come across a page with no iop allocated, so remove the assertions that there is already one, and just create one (with the Uptodate bits set) if there isn't one. Signed-off-by: Matthew Wilcox (Oracle) --- fs/iomap/buffered-io.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 5cc0343b6a8e..9ea162617398 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -54,6 +54,8 @@ iomap_page_create(struct inode *inode, struct page *page) iop = kzalloc(struct_size(iop, uptodate, BITS_TO_LONGS(nr_blocks)), GFP_NOFS | __GFP_NOFAIL); spin_lock_init(&iop->uptodate_lock); + if (PageUptodate(page)) + bitmap_fill(iop->uptodate, nr_blocks); attach_page_private(page, iop); return iop; } @@ -483,10 +485,17 @@ iomap_invalidatepage(struct page *page, unsigned int offset, unsigned int len) * If we are invalidating the entire page, clear the dirty state from it * and release it to avoid unnecessary buildup of the LRU. */ - if (offset == 0 && len == PAGE_SIZE) { + if (offset == 0 && len == thp_size(page)) { WARN_ON_ONCE(PageWriteback(page)); cancel_dirty_page(page); iomap_page_release(page); + return; + } + + /* Punching a hole in a THP requires releasing the iop */ + if (PageTransHuge(page)) { + VM_BUG_ON_PAGE(!PageUptodate(page), page); + iomap_page_release(page); } } EXPORT_SYMBOL_GPL(iomap_invalidatepage); @@ -1043,14 +1052,13 @@ static void iomap_finish_page_writeback(struct inode *inode, struct page *page, int error, unsigned int len) { - struct iomap_page *iop = to_iomap_page(page); + struct iomap_page *iop = iomap_page_create(inode, page); if (error) { SetPageError(page); mapping_set_error(inode->i_mapping, -EIO); } - WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop); WARN_ON_ONCE(iop && atomic_read(&iop->write_count) <= 0); if (!iop || atomic_sub_and_test(len, &iop->write_count)) @@ -1340,14 +1348,13 @@ iomap_writepage_map(struct iomap_writepage_ctx *wpc, struct writeback_control *wbc, struct inode *inode, struct page *page, u64 end_offset) { - struct iomap_page *iop = to_iomap_page(page); + struct iomap_page *iop = iomap_page_create(inode, page); struct iomap_ioend *ioend, *next; unsigned len = i_blocksize(inode); u64 file_offset; /* file offset of page */ int error = 0, count = 0, i; LIST_HEAD(submit_list); - WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop); WARN_ON_ONCE(iop && atomic_read(&iop->write_count) != 0); /*