btrfs: move root helpers back into ctree.h

These accidentally got brought into accessors.h, but belong with the
btrfs_root definitions which are currently in ctree.h.  Move these to
make it easier to sync accessors.[ch] into btrfs-progs.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/accessors.h

@@ -712,23 +712,6 @@ BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item, otransid, 64);
 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item, stransid, 64);
 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item, rtransid, 64);
 
-static inline bool btrfs_root_readonly(const struct btrfs_root *root)
-{
-	/* Byte-swap the constant at compile time, root_item::flags is LE */
-	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
-}
-
-static inline bool btrfs_root_dead(const struct btrfs_root *root)
-{
-	/* Byte-swap the constant at compile time, root_item::flags is LE */
-	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
-}
-
-static inline u64 btrfs_root_id(const struct btrfs_root *root)
-{
-	return root->root_key.objectid;
-}
-
 /* struct btrfs_root_backup */
 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
 		   tree_root, 64);

fs/btrfs/ctree.h

@@ -335,6 +335,23 @@ struct btrfs_root {
 #endif
 };
 
+static inline bool btrfs_root_readonly(const struct btrfs_root *root)
+{
+	/* Byte-swap the constant at compile time, root_item::flags is LE */
+	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
+}
+
+static inline bool btrfs_root_dead(const struct btrfs_root *root)
+{
+	/* Byte-swap the constant at compile time, root_item::flags is LE */
+	return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
+}
+
+static inline u64 btrfs_root_id(const struct btrfs_root *root)
+{
+	return root->root_key.objectid;
+}
+
 /*
  * Structure that conveys information about an extent that is going to replace
  * all the extents in a file range.