Add root tree pointer transaction ids

This patch adds transaction IDs to root tree pointers.
Transaction IDs in tree pointers are compared with the
generation numbers in block headers when reading root
blocks of trees. This can detect some types of IO errors.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/mkfs.c b/mkfs.c
index 3c09c3a9..dae43e97 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -247,6 +247,7 @@ static int create_data_reloc_tree(struct btrfs_trans_handle *trans,
 	memcpy(&root_item, &root->root_item, sizeof(root_item));
 	btrfs_set_root_bytenr(&root_item, tmp->start);
 	btrfs_set_root_level(&root_item, btrfs_header_level(tmp));
+	btrfs_set_root_generation(&root_item, trans->transid);
 	free_extent_buffer(tmp);
 
 	location.objectid = objectid;