[PATCH v4 20/20] xfsprogs/db: add finobt support to metadump

[Brian Foster]

Include the free inode btree in metadump images. If the source fs
is finobt-enabled, run an additional scan_btree() of the finobt.
Since the private 'agi' scanfunc_ino() parameter is unused, change
the private parameter to a flag that indicates whether the current
scan is for the inobt or finobt. If the latter, we skip copying the
actual inode chunks as this work is already performed by the inobt
scan.

Signed-off-by: Brian Foster <bfoster at redhat.com>
Reviewed-by: Dave Chinner <dchinner at redhat.com>
---
 db/metadump.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/db/metadump.c b/db/metadump.c
index 09bb85a..38cd441 100644
--- a/db/metadump.c
+++ b/db/metadump.c
@@ -1917,6 +1917,7 @@ scanfunc_ino(
 	xfs_inobt_ptr_t		*pp;
 	int			i;
 	int			numrecs;
+	int			finobt = *(int *) arg;
 
 	numrecs = be16_to_cpu(block->bb_numrecs);
 
@@ -1928,6 +1929,14 @@ scanfunc_ino(
 					typtab[btype].name, agno, agbno);
 			numrecs = mp->m_inobt_mxr[0];
 		}
+
+		/*
+		 * Only copy the btree blocks for the finobt. The inobt scan
+		 * copies the inode chunks.
+		 */
+		if (finobt)
+			return 1;
+
 		rp = XFS_INOBT_REC_ADDR(mp, block, 1);
 		for (i = 0; i < numrecs; i++, rp++) {
 			if (!copy_inode_chunk(agno, rp))
@@ -1967,6 +1976,7 @@ copy_inodes(
 {
 	xfs_agblock_t		root;
 	int			levels;
+	int			finobt = 0;
 
 	root = be32_to_cpu(agi->agi_root);
 	levels = be32_to_cpu(agi->agi_level);
@@ -1985,7 +1995,20 @@ copy_inodes(
 		return 1;
 	}
 
-	return scan_btree(agno, root, levels, TYP_INOBT, agi, scanfunc_ino);
+	if (!scan_btree(agno, root, levels, TYP_INOBT, &finobt, scanfunc_ino))
+		return 0;
+
+	if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+		root = be32_to_cpu(agi->agi_free_root);
+		levels = be32_to_cpu(agi->agi_free_level);
+
+		finobt = 1;
+		if (!scan_btree(agno, root, levels, TYP_INOBT, &finobt,
+				scanfunc_ino))
+			return 0;
+	}
+
+	return 1;
 }
 
 static int
-- 
1.8.3.1