From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org, xfs@oss.sgi.com
Subject: [PATCH 02/25] xfs: report shared extents in getfsmapx
Date: Thu, 25 Aug 2016 16:40:25 -0700 [thread overview]
Message-ID: <147216842570.3108.8594952543604455508.stgit@birch.djwong.org> (raw)
In-Reply-To: <147216841262.3108.10746252464845687338.stgit@birch.djwong.org>
Cross-reference the reverse mapping data with the refcount btree to find
out which extents are shared.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
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 a167acb..2eca7b9 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"
/* getfsmap query state */
struct xfs_getfsmap_info {
@@ -99,6 +101,42 @@ 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->agbp,
+ 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.
@@ -112,6 +150,7 @@ xfs_getfsmap_helper(
{
struct getfsmap fmv;
xfs_daddr_t key_end;
+ bool shared;
int error;
/*
@@ -221,6 +260,13 @@ xfs_getfsmap_helper(
fmv.fmv_oflags |= FMV_OF_ATTR_FORK;
if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK)
fmv.fmv_oflags |= FMV_OF_EXTENT_MAP;
+ if (fmv.fmv_oflags == 0) {
+ error = xfs_getfsmap_is_shared(mp, info, rec, &shared);
+ if (error)
+ return error;
+ if (shared)
+ fmv.fmv_oflags |= FMV_OF_SHARED;
+ }
error = info->formatter(&fmv, info->format_arg);
if (error)
return error;
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next prev parent reply other threads:[~2016-08-25 23:40 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-25 23:40 [PATCH v8 00/25] xfs: online scrub support Darrick J. Wong
2016-08-25 23:40 ` [PATCH 01/25] xfs: introduce the XFS_IOC_GETFSMAP ioctl Darrick J. Wong
2016-08-25 23:40 ` Darrick J. Wong [this message]
2016-08-25 23:40 ` [PATCH 03/25] xfs: have getfsmap fall back to the freesp btrees when rmap is not present Darrick J. Wong
2016-08-25 23:40 ` [PATCH 04/25] xfs: getfsmap should fall back to rtbitmap when rtrmapbt " Darrick J. Wong
2016-08-25 23:40 ` [PATCH 05/25] xfs: add scrub tracepoints Darrick J. Wong
2016-08-25 23:40 ` [PATCH 06/25] xfs: generic functions to scrub metadata and btrees Darrick J. Wong
2016-08-25 23:40 ` [PATCH 07/25] xfs: create an ioctl to scrub AG metadata Darrick J. Wong
2016-08-25 23:41 ` [PATCH 08/25] xfs: scrub the backup superblocks Darrick J. Wong
2016-08-25 23:41 ` [PATCH 09/25] xfs: scrub AGF and AGFL Darrick J. Wong
2016-08-25 23:41 ` [PATCH 10/25] xfs: scrub the AGI Darrick J. Wong
2016-08-25 23:41 ` [PATCH 11/25] xfs: support scrubbing free space btrees Darrick J. Wong
2016-08-25 23:41 ` [PATCH 12/25] xfs: support scrubbing inode btrees Darrick J. Wong
2016-08-25 23:41 ` [PATCH 13/25] xfs: support scrubbing rmap btree Darrick J. Wong
2016-08-25 23:41 ` [PATCH 14/25] xfs: support scrubbing refcount btree Darrick J. Wong
2016-08-25 23:41 ` [PATCH 15/25] xfs: scrub inodes Darrick J. Wong
2016-08-25 23:41 ` [PATCH 16/25] xfs: scrub inode block mappings Darrick J. Wong
2016-08-25 23:42 ` [PATCH 17/25] xfs: scrub realtime bitmap/summary Darrick J. Wong
2016-08-25 23:42 ` [PATCH 18/25] xfs: scrub should cross-reference with the bnobt Darrick J. Wong
2016-08-25 23:42 ` [PATCH 19/25] xfs: cross-reference bnobt records with cntbt Darrick J. Wong
2016-08-25 23:42 ` [PATCH 20/25] xfs: cross-reference extents with AG header Darrick J. Wong
2016-08-25 23:42 ` [PATCH 21/25] xfs: cross-reference inode btrees during scrub Darrick J. Wong
2016-08-25 23:42 ` [PATCH 22/25] xfs: cross-reference reverse-mapping btree Darrick J. Wong
2016-08-25 23:42 ` [PATCH 23/25] xfs: cross-reference refcount btree during scrub Darrick J. Wong
2016-08-25 23:42 ` [PATCH 24/25] xfs: scrub should cross-reference the realtime bitmap Darrick J. Wong
2016-08-25 23:42 ` [PATCH 25/25] xfs: query the per-AG reservation counters Darrick J. Wong
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