[v4,03/18] btrfs-progs: lowmem check: assign @parent early in repair_extent_data_item()
diff mbox

Message ID 20180208032737.31561-4-suy.fnst@cn.fujitsu.com
State New
Headers show

Commit Message

Su Yue Feb. 8, 2018, 3:27 a.m. UTC
The variable @eb is assigned to leaf in fs_tree before insertion of
backref. It will causes wrong parent of new inserted backref.

Set @parent at beginning solves the problem.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 check/mode-lowmem.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

Patch
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diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c
index 18ec6db098e7..1fc84f1e8c44 100644
--- a/check/mode-lowmem.c
+++ b/check/mode-lowmem.c
@@ -2475,6 +2475,11 @@  static int repair_extent_data_item(struct btrfs_trans_handle *trans,
 	extent_offset = btrfs_file_extent_offset(eb, fi);
 	offset = file_offset - extent_offset;
 
+	if (nrefs->full_backref[0])
+		parent = btrfs_header_bytenr(eb);
+	else
+		parent = 0;
+
 	/* now repair only adds backref */
 	if ((err & BACKREF_MISSING) == 0)
 		return err;
@@ -2516,11 +2521,6 @@  static int repair_extent_data_item(struct btrfs_trans_handle *trans,
 		btrfs_release_path(&path);
 	}
 
-	if (nrefs->full_backref[0])
-		parent = btrfs_header_bytenr(eb);
-	else
-		parent = 0;
-
 	ret = btrfs_inc_extent_ref(trans, root, disk_bytenr, num_bytes, parent,
 				   root->objectid,
 		   parent ? BTRFS_FIRST_FREE_OBJECTID : fi_key.objectid,