From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp1040.oracle.com ([141.146.126.69]:19312 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751015AbdAUIBY (ORCPT ); Sat, 21 Jan 2017 03:01:24 -0500 Subject: [PATCH 10/55] xfs: report shared extents in getfsmapx From: "Darrick J. Wong" To: darrick.wong@oracle.com Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Sat, 21 Jan 2017 00:01:19 -0800 Message-ID: <148498567983.15323.13796316096760884610.stgit@birch.djwong.org> In-Reply-To: <148498561504.15323.8531512066874274553.stgit@birch.djwong.org> References: <148498561504.15323.8531512066874274553.stgit@birch.djwong.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org List-ID: 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(+) 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;