btrfs: relocation: open code mapping_tree_init

There's only one user of mapping_tree_init, we don't need a helper for
the simple initialization.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 87ac852..3e662ca 100644 (file)
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -183,13 +183,6 @@ static void mark_block_processed(struct reloc_control *rc,
        node->processed = 1;
 }
 
-
-static void mapping_tree_init(struct mapping_tree *tree)
-{
-       tree->rb_root = RB_ROOT;
-       spin_lock_init(&tree->lock);
-}
-
 /*
  * walk up backref nodes until reach node presents tree root
  */
@@ -4024,7 +4017,8 @@ static struct reloc_control *alloc_reloc_control(struct btrfs_fs_info *fs_info)
        INIT_LIST_HEAD(&rc->reloc_roots);
        INIT_LIST_HEAD(&rc->dirty_subvol_roots);
        btrfs_backref_init_cache(fs_info, &rc->backref_cache, 1);
-       mapping_tree_init(&rc->reloc_root_tree);
+       rc->reloc_root_tree.rb_root = RB_ROOT;
+       spin_lock_init(&rc->reloc_root_tree.lock);
        extent_io_tree_init(fs_info, &rc->processed_blocks, IO_TREE_RELOC_BLOCKS);
        return rc;
 }