From patchwork Sat Jan 7 00:36:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 9502531 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 F18F860459 for ; Sat, 7 Jan 2017 00:36:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E60DA2811E for ; Sat, 7 Jan 2017 00:36:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D95FE28520; Sat, 7 Jan 2017 00:36:22 +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=ham 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 6B1D728508 for ; Sat, 7 Jan 2017 00:36:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966461AbdAGAgV (ORCPT ); Fri, 6 Jan 2017 19:36:21 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:40634 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964977AbdAGAgV (ORCPT ); Fri, 6 Jan 2017 19:36:21 -0500 Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v070aKa9023182 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Sat, 7 Jan 2017 00:36:20 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id v070aKT6000426 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Sat, 7 Jan 2017 00:36:20 GMT Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id v070aKHV015717 for ; Sat, 7 Jan 2017 00:36:20 GMT Received: from localhost (/24.21.211.40) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 06 Jan 2017 16:36:20 -0800 Subject: [PATCH 05/47] xfs: report shared extents in getfsmapx From: "Darrick J. Wong" To: darrick.wong@oracle.com Cc: linux-xfs@vger.kernel.org Date: Fri, 06 Jan 2017 16:36:19 -0800 Message-ID: <148374937921.30431.13515454201640723877.stgit@birch.djwong.org> In-Reply-To: <148374934333.30431.11042523766304087227.stgit@birch.djwong.org> References: <148374934333.30431.11042523766304087227.stgit@birch.djwong.org> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Cross-reference the reverse mapping data with the refcount btree to find out which extents are shared. Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_fsmap.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" 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/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 985415b..d729581 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -37,6 +37,8 @@ #include "xfs_alloc.h" #include "xfs_bit.h" #include "xfs_fsmap.h" +#include "xfs_refcount.h" +#include "xfs_refcount_btree.h" /* Convert an xfs_fsmap to an fsmap. */ void @@ -192,6 +194,42 @@ xfs_getfsmap_rec_before_low_key( return false; } +/* Decide if this mapping is shared. */ +STATIC int +xfs_getfsmap_is_shared( + struct xfs_mount *mp, + struct xfs_getfsmap_info *info, + struct xfs_rmap_irec *rec, + bool *stat) +{ + struct xfs_btree_cur *cur; + xfs_agblock_t fbno; + xfs_extlen_t flen; + int error; + + *stat = false; + if (!xfs_sb_version_hasreflink(&mp->m_sb)) + return 0; + /* rt files will have agno set to NULLAGNUMBER */ + if (info->agno == NULLAGNUMBER) + return 0; + + /* Are there any shared blocks here? */ + flen = 0; + cur = xfs_refcountbt_init_cursor(mp, NULL, info->agf_bp, + info->agno, NULL); + + error = xfs_refcount_find_shared(cur, rec->rm_startblock, + rec->rm_blockcount, &fbno, &flen, false); + + xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); + if (error) + return error; + + *stat = flen > 0; + return 0; +} + /* * Format a reverse mapping for getfsmap, having translated rm_startblock * into the appropriate daddr units. @@ -205,6 +243,7 @@ xfs_getfsmap_helper( { struct xfs_fsmap fmr; xfs_daddr_t key_end; + bool shared; int error; /* @@ -304,6 +343,13 @@ xfs_getfsmap_helper( fmr.fmr_flags |= FMR_OF_ATTR_FORK; if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK) fmr.fmr_flags |= FMR_OF_EXTENT_MAP; + if (fmr.fmr_flags == 0) { + error = xfs_getfsmap_is_shared(mp, info, rec, &shared); + if (error) + return error; + if (shared) + fmr.fmr_flags |= FMR_OF_SHARED; + } error = info->formatter(&fmr, info->format_arg); if (error) return error;