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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 D2540C388F9 for ; Mon, 26 Oct 2020 18:31:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 747F32076A for ; Mon, 26 Oct 2020 18:31:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="UPOocnwb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1789827AbgJZSbn (ORCPT ); Mon, 26 Oct 2020 14:31:43 -0400 Received: from casper.infradead.org ([90.155.50.34]:47256 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1789823AbgJZSbn (ORCPT ); Mon, 26 Oct 2020 14:31:43 -0400 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=2GAXeQp+qAGjuy9bKsT7VgfxgDveHwfLIaFkncYVm0o=; b=UPOocnwbI4TisiKum357PRYSKj XxutU7joMqEKT/ihMp6W48etMOMVqcEPp8snpREsxUA7e9Z5nfUhsRiNC2BKNl+4pLwYjRrOU4Xwv 0fmiymHr+J0JPI4xGlMP+OyTceZsTzmWpRL3aeSxSsCeebqYX8vZbu7NEMy8LMnHJ/U5bX9QZOvSE XrvzzesWuAOGt7mWXs2X9PLk1jRJiYwLLVw83sArkcGv4Ppn5EqFJYcgG1ExexRoKZ0RmqXTy3uLB UkRSWDMEdkF+udy7xYRav7I63Iz3qQ3dAJTijTnSl5vZVPkBuhpUOAoASUl/RSZ+ZmIVXeFChzVx7 IDm+feIQ==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kX7HR-0002jK-9n; Mon, 26 Oct 2020 18:31:41 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org Subject: [PATCH 2/9] mm/page-flags: Allow accessing PageError on tail pages Date: Mon, 26 Oct 2020 18:31:29 +0000 Message-Id: <20201026183136.10404-3-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20201026183136.10404-1-willy@infradead.org> References: <20201026183136.10404-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org We track whether a page has had a read error for the entire THP, just like we track Uptodate and Dirty. This lets, eg, generic_file_buffered_read() continue to work on the appropriate subpage of the THP without modification. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/page-flags.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 4f6ba9379112..eb3a9796de8e 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -328,7 +328,8 @@ static inline int TestClearPage##uname(struct page *page) { return 0; } __PAGEFLAG(Locked, locked, PF_NO_TAIL) PAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) __CLEARPAGEFLAG(Waiters, waiters, PF_ONLY_HEAD) -PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL) +PAGEFLAG(Error, error, PF_HEAD) + TESTCLEARFLAG(Error, error, PF_HEAD) PAGEFLAG(Referenced, referenced, PF_HEAD) TESTCLEARFLAG(Referenced, referenced, PF_HEAD) __SETPAGEFLAG(Referenced, referenced, PF_HEAD) -- 2.28.0