btrfs: kill magical embedded struct superblock

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 11 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1ac8db5dc0a3..b231ae13b269 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1077,12 +1077,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
         init_completion(&root->kobj_unregister);
         root->defrag_running = 0;
         root->root_key.objectid = objectid;
-        root->anon_super.s_root = NULL;
-        root->anon_super.s_dev = 0;
-        INIT_LIST_HEAD(&root->anon_super.s_list);
-        INIT_LIST_HEAD(&root->anon_super.s_instances);
-        init_rwsem(&root->anon_super.s_umount);
-
+        root->anon_dev = 0;
         return 0;
 }
 
@@ -1311,7 +1306,7 @@ again:
         spin_lock_init(&root->cache_lock);
         init_waitqueue_head(&root->cache_wait);
 
-        ret = set_anon_super(&root->anon_super, NULL);
+        ret = get_anon_bdev(&root->anon_dev);
         if (ret)
                 goto fail;
 
@@ -2393,10 +2388,8 @@ static void free_fs_root(struct btrfs_root *root)
 {
         iput(root->cache_inode);
         WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
-        if (root->anon_super.s_dev) {
-                down_write(&root->anon_super.s_umount);
-                kill_anon_super(&root->anon_super);
-        }
+        if (root->anon_dev)
+                free_anon_bdev(root->anon_dev);
         free_extent_buffer(root->node);
         free_extent_buffer(root->commit_root);
         kfree(root->free_ino_ctl);