From patchwork Fri Jun 17 01:17:34 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 9182015 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0311260760 for ; Fri, 17 Jun 2016 01:18:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E89932839F for ; Fri, 17 Jun 2016 01:18:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DD058283A1; Fri, 17 Jun 2016 01:18:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3AF6F283A0 for ; Fri, 17 Jun 2016 01:18:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754886AbcFQBSP (ORCPT ); Thu, 16 Jun 2016 21:18:15 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:27959 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754875AbcFQBSN (ORCPT ); Thu, 16 Jun 2016 21:18:13 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u5H1HdYY003785 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 17 Jun 2016 01:17:39 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userv0021.oracle.com (8.13.8/8.13.8) with ESMTP id u5H1HbCF006925 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 17 Jun 2016 01:17:37 GMT Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0121.oracle.com (8.13.8/8.13.8) with ESMTP id u5H1HaGC021989; Fri, 17 Jun 2016 01:17:36 GMT Received: from localhost (/10.145.178.207) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 16 Jun 2016 18:17:36 -0700 Subject: [PATCH 1/3] block: invalidate the page cache when issuing BLKZEROOUT. From: "Darrick J. Wong" To: axboe@kernel.dk, darrick.wong@oracle.com Cc: linux-block@vger.kernel.org, tytso@mit.edu, martin.petersen@oracle.com, snitzer@redhat.com, linux-api@vger.kernel.org, bfoster@redhat.com, xfs@oss.sgi.com, hch@infradead.org, dm-devel@redhat.com, linux-fsdevel@vger.kernel.org, Christoph Hellwig Date: Thu, 16 Jun 2016 18:17:34 -0700 Message-ID: <146612625412.12764.6647932282740152837.stgit@birch.djwong.org> In-Reply-To: <146612624734.12764.4316680863289411106.stgit@birch.djwong.org> References: <146612624734.12764.4316680863289411106.stgit@birch.djwong.org> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Invalidate the page cache (as a regular O_DIRECT write would do) to avoid returning stale cache contents at a later time. v5: Refactor the 4.4 refactoring of the ioctl code into separate functions. Split the page invalidation and the new ioctl into separate patches. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- block/ioctl.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/block/ioctl.c b/block/ioctl.c index ed2397f..d001f52 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -225,7 +225,9 @@ static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, unsigned long arg) { uint64_t range[2]; - uint64_t start, len; + struct address_space *mapping; + uint64_t start, end, len; + int ret; if (!(mode & FMODE_WRITE)) return -EBADF; @@ -235,18 +237,33 @@ static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, start = range[0]; len = range[1]; + end = start + len - 1; if (start & 511) return -EINVAL; if (len & 511) return -EINVAL; - start >>= 9; - len >>= 9; - - if (start + len > (i_size_read(bdev->bd_inode) >> 9)) + if (end >= (uint64_t)i_size_read(bdev->bd_inode)) + return -EINVAL; + if (end < start) return -EINVAL; - return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL, false); + /* Invalidate the page cache, including dirty pages */ + mapping = bdev->bd_inode->i_mapping; + truncate_inode_pages_range(mapping, start, end); + + ret = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, + false); + if (ret) + return ret; + + /* + * Invalidate again; if someone wandered in and dirtied a page, + * the caller will be given -EBUSY. + */ + return invalidate_inode_pages2_range(mapping, + start >> PAGE_SHIFT, + end >> PAGE_SHIFT); } static int put_ushort(unsigned long arg, unsigned short val)