[PATCH v2 05/18] btrfs: do not allow free space tree rebuild on extent tree v2

[Josef Bacik <josef@toxicpanda.com>]

We currently don't allow these options to be set if we're extent tree v2
via the mount option parsing.  However when we switch to the new mount
API we'll no longer have the super block loaded, so won't be able to
make this distinction at mount option parsing time.  Address this by
checking for extent tree v2 at the point where we make the decision to
rebuild the free space tree.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/disk-io.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b486cbec492b..072c45811c41 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2951,7 +2951,8 @@ int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info)
 	bool rebuild_free_space_tree = false;
 
 	if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
-	    btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
+	    btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
+	    !btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
 		rebuild_free_space_tree = true;
 	} else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
 		   !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
-- 
2.41.0