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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 06A02C43462 for ; Mon, 17 May 2021 15:29:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4FC161004 for ; Mon, 17 May 2021 15:29:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245540AbhEQP3x (ORCPT ); Mon, 17 May 2021 11:29:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:37322 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243735AbhEQPOk (ORCPT ); Mon, 17 May 2021 11:14:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2F7C161C56; Mon, 17 May 2021 14:32:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621261938; bh=wDJhxQOEDc8aQnJw65IidDYadfoMb8yQtlHWv0gz6kE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dKoSqXB930A3zW1Q70TpKUsKdi2wE4ZcoMpUSDWf6qcLeu5wpbfGL1nwepygs6SPj 63ANlG3YuTQTQlqBlKng7gRLqh6vALtQuCxcI/zudd4DHJu8f0wwH2QJWCH+lNfUly XdGT0LKmJtBT0rA2baNXklbpyBZwm9Aq2EE5CFBs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Stancek , Christoph Hellwig , Dave Chinner , "Darrick J. Wong" , "Matthew Wilcox (Oracle)" Subject: [PATCH 5.4 112/141] iomap: fix sub-page uptodate handling Date: Mon, 17 May 2021 16:02:44 +0200 Message-Id: <20210517140246.570238914@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140242.729269392@linuxfoundation.org> References: <20210517140242.729269392@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christoph Hellwig commit 1cea335d1db1ce6ab71b3d2f94a807112b738a0f upstream. bio completions can race when a page spans more than one file system block. Add a spinlock to synchronize marking the page uptodate. Fixes: 9dc55f1389f9 ("iomap: add support for sub-pagesize buffered I/O without buffer heads") Reported-by: Jan Stancek Signed-off-by: Christoph Hellwig Reviewed-by: Dave Chinner Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Cc: "Matthew Wilcox (Oracle)" Signed-off-by: Greg Kroah-Hartman --- fs/iomap/buffered-io.c | 34 ++++++++++++++++++++++++---------- include/linux/iomap.h | 1 + 2 files changed, 25 insertions(+), 10 deletions(-) --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -30,6 +30,7 @@ iomap_page_create(struct inode *inode, s iop = kmalloc(sizeof(*iop), GFP_NOFS | __GFP_NOFAIL); atomic_set(&iop->read_count, 0); atomic_set(&iop->write_count, 0); + spin_lock_init(&iop->uptodate_lock); bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE); /* @@ -118,25 +119,38 @@ iomap_adjust_read_range(struct inode *in } static void -iomap_set_range_uptodate(struct page *page, unsigned off, unsigned len) +iomap_iop_set_range_uptodate(struct page *page, unsigned off, unsigned len) { struct iomap_page *iop = to_iomap_page(page); struct inode *inode = page->mapping->host; unsigned first = off >> inode->i_blkbits; unsigned last = (off + len - 1) >> inode->i_blkbits; - unsigned int i; bool uptodate = true; + unsigned long flags; + unsigned int i; - if (iop) { - for (i = 0; i < PAGE_SIZE / i_blocksize(inode); i++) { - if (i >= first && i <= last) - set_bit(i, iop->uptodate); - else if (!test_bit(i, iop->uptodate)) - uptodate = false; - } + spin_lock_irqsave(&iop->uptodate_lock, flags); + for (i = 0; i < PAGE_SIZE / i_blocksize(inode); i++) { + if (i >= first && i <= last) + set_bit(i, iop->uptodate); + else if (!test_bit(i, iop->uptodate)) + uptodate = false; } - if (uptodate && !PageError(page)) + if (uptodate) + SetPageUptodate(page); + spin_unlock_irqrestore(&iop->uptodate_lock, flags); +} + +static void +iomap_set_range_uptodate(struct page *page, unsigned off, unsigned len) +{ + if (PageError(page)) + return; + + if (page_has_private(page)) + iomap_iop_set_range_uptodate(page, off, len); + else SetPageUptodate(page); } --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -139,6 +139,7 @@ loff_t iomap_apply(struct inode *inode, struct iomap_page { atomic_t read_count; atomic_t write_count; + spinlock_t uptodate_lock; DECLARE_BITMAP(uptodate, PAGE_SIZE / 512); };