[PATCH 4/6] btrfs-progs: Add freespace tree as compat_ro supported feature

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The RO_FREE_SPACE_TREE(_VALID) flags are required in order to be able
to open an FST filesystem in repair mode. Add them to
BTRFS_FEATURE_COMPAT_RO_SUPP.

Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx>
---
 ctree.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ctree.h b/ctree.h
index ade883fecbd6..ef05e8122982 100644
--- a/ctree.h
+++ b/ctree.h
@@ -497,7 +497,9 @@ struct btrfs_super_block {
  * added here until read-write support for the free space tree is implemented in
  * btrfs-progs.
  */
-#define BTRFS_FEATURE_COMPAT_RO_SUPP		0ULL
+#define BTRFS_FEATURE_COMPAT_RO_SUPP			\
+	(BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE |	\
+	 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
 
 #define BTRFS_FEATURE_INCOMPAT_SUPP			\
 	(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF |		\
-- 
2.7.4

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