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_INVALID, DKIM_SIGNED,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 5F80BC43461 for ; Mon, 14 Sep 2020 13:05:31 +0000 (UTC) Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 00BD9221E3; Mon, 14 Sep 2020 13:05:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=sourceforge.net header.i=@sourceforge.net header.b="SyOKAIv5"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=sf.net header.i=@sf.net header.b="R+sQhiLE"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="X+Dq8ZdF" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 00BD9221E3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linux-f2fs-devel-bounces@lists.sourceforge.net Received: from [127.0.0.1] (helo=sfs-ml-2.v29.lw.sourceforge.com) by sfs-ml-2.v29.lw.sourceforge.com with esmtp (Exim 4.90_1) (envelope-from ) id 1kHoAk-00012f-K6; Mon, 14 Sep 2020 13:05:30 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-2.v29.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kHoAj-00012U-5n for linux-f2fs-devel@lists.sourceforge.net; Mon, 14 Sep 2020 13:05:29 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; 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=sAfoea0Ieit+OdTx0mtFIFg+HUpFYKbaNiCMKjjxkXw=; b=SyOKAIv5qqJxjcd2F2mjhvD4WG Vu06EP1lx+cdMoOMDtNbGSrf1wbmDeFvPrF0LoHF3zSaty625pWVuPEs9W5ph7+5DGQlFsCm0mgE+ KaZSqYzaCGHOQGxxfhaiC2Y7y2K3C92EajcCw9zr+gincG85t/zkfkJ+LQoSZyFS2pA4=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; 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=sAfoea0Ieit+OdTx0mtFIFg+HUpFYKbaNiCMKjjxkXw=; b=R+sQhiLE2xHhMR56dNstdy+3lQ uQ8hw7mZ2PzsbeUph6PpAJtZHreyz0IRl6mgmBZQTKDlr84amdRlmiWjhNLm1nXKW5P/y1tuTXjdg iLF5xfp704y+IsntkZHLIh/2fdg1bMbrsRO1vI9BlEyBeBoudoWNYgCXhghO3Dh9UMDw=; Received: from mail.kernel.org ([198.145.29.99]) by sfi-mx-1.v28.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.2) id 1kHoAg-009A5b-9c for linux-f2fs-devel@lists.sourceforge.net; Mon, 14 Sep 2020 13:05:29 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2FDFF22268; Mon, 14 Sep 2020 13:05:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600088720; bh=ovSjpe2ce2YVY9yKlvvgRCAOPx0oaHO+4EhjgHFnIVE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X+Dq8ZdF7rrjjirLyPekzncXgO1kVntPt4HIZ2bCYdj6ghRnGrkybckObRS+fvzJR 7+zWWu5xMTXo8mpT5ZphgTOOi41MPGM8Ev//IYWPHFjgk6iYIks3Hs5Eszt50kLLmH u3iBPut+b/f0lId4ca6JJQbyEhQtDE3d5URBc4B4= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Mon, 14 Sep 2020 09:04:58 -0400 Message-Id: <20200914130502.1804708-15-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200914130502.1804708-1-sashal@kernel.org> References: <20200914130502.1804708-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-Headers-End: 1kHoAg-009A5b-9c Subject: [f2fs-dev] [PATCH AUTOSEL 4.19 15/19] f2fs: Return EOF on unaligned end of file DIO read X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Jaegeuk Kim , Gabriel Krisman Bertazi , linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Gabriel Krisman Bertazi [ Upstream commit 20d0a107fb35f37578b919f62bd474d6d358d579 ] Reading past end of file returns EOF for aligned reads but -EINVAL for unaligned reads on f2fs. While documentation is not strict about this corner case, most filesystem returns EOF on this case, like iomap filesystems. This patch consolidates the behavior for f2fs, by making it return EOF(0). it can be verified by a read loop on a file that does a partial read before EOF (A file that doesn't end at an aligned address). The following code fails on an unaligned file on f2fs, but not on btrfs, ext4, and xfs. while (done < total) { ssize_t delta = pread(fd, buf + done, total - done, off + done); if (!delta) break; ... } It is arguable whether filesystems should actually return EOF or -EINVAL, but since iomap filesystems support it, and so does the original DIO code, it seems reasonable to consolidate on that. Signed-off-by: Gabriel Krisman Bertazi Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/data.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index c81a1f3f0a101..c63f5e32630ee 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2490,6 +2490,9 @@ static int check_direct_IO(struct inode *inode, struct iov_iter *iter, unsigned long align = offset | iov_iter_alignment(iter); struct block_device *bdev = inode->i_sb->s_bdev; + if (iov_iter_rw(iter) == READ && offset >= i_size_read(inode)) + return 1; + if (align & blocksize_mask) { if (bdev) blkbits = blksize_bits(bdev_logical_block_size(bdev)); -- 2.25.1 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel