btrfs-progs: separate super_copy out of fs_info

Allocate fs_info::super_copy dynamically of full BTRFS_SUPER_INFO_SIZE
and use it directly for saving superblock to disk.

This fixes incorrect superblock checksum after mkfs.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/ctree.h b/ctree.h
index 0aed2fcb..9442e037 100644
--- a/ctree.h
+++ b/ctree.h
@@ -923,7 +923,7 @@ struct btrfs_fs_info {
 	u64 alloc_start;
 
 	struct btrfs_trans_handle *running_transaction;
-	struct btrfs_super_block super_copy;
+	struct btrfs_super_block *super_copy;
 	struct mutex fs_mutex;
 
 	u64 super_bytenr;