Btrfs: create UUID tree if required

This tree is not created by mkfs.btrfs. Therefore when a filesystem
is mounted writable and the UUID tree does not exist, this tree is
created if required. The tree is also added to the fs_info structure
and initialized, but this commit does not yet read or write UUID tree
elements.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 429c54ac1a65..c03e61ef7230 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1306,6 +1306,7 @@ struct btrfs_fs_info {
         struct btrfs_root *fs_root;
         struct btrfs_root *csum_root;
         struct btrfs_root *quota_root;
+        struct btrfs_root *uuid_root;
 
         /* the log root tree is a directory of all the other log roots */
         struct btrfs_root *log_root_tree;