btrfs: directly pass in fs_info to btrfs_merge_delayed_refs

Now that none of the functions called by btrfs_merge_delayed_refs() needs
a btrfs_trans_handle, directly pass in a btrfs_fs_info to
btrfs_merge_delayed_refs().
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/delayed-ref.c

@@ -497,11 +497,10 @@ static bool merge_ref(struct btrfs_delayed_ref_root *delayed_refs,
 	return done;
 }
 
-void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
+void btrfs_merge_delayed_refs(struct btrfs_fs_info *fs_info,
 			      struct btrfs_delayed_ref_root *delayed_refs,
 			      struct btrfs_delayed_ref_head *head)
 {
-	struct btrfs_fs_info *fs_info = trans->fs_info;
 	struct btrfs_delayed_ref_node *ref;
 	struct rb_node *node;
 	u64 seq = 0;

fs/btrfs/delayed-ref.h

@@ -357,7 +357,7 @@ int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
 int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
 				u64 bytenr, u64 num_bytes,
 				struct btrfs_delayed_extent_op *extent_op);
-void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
+void btrfs_merge_delayed_refs(struct btrfs_fs_info *fs_info,
 			      struct btrfs_delayed_ref_root *delayed_refs,
 			      struct btrfs_delayed_ref_head *head);
 

fs/btrfs/extent-tree.c

@@ -1966,7 +1966,7 @@ static int btrfs_run_delayed_refs_for_head(struct btrfs_trans_handle *trans,
 		cond_resched();
 
 		spin_lock(&locked_ref->lock);
-		btrfs_merge_delayed_refs(trans, delayed_refs, locked_ref);
+		btrfs_merge_delayed_refs(fs_info, delayed_refs, locked_ref);
 	}
 
 	return 0;
@@ -2013,7 +2013,7 @@ static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
 		 * insert_inline_extent_backref()).
 		 */
 		spin_lock(&locked_ref->lock);
-		btrfs_merge_delayed_refs(trans, delayed_refs, locked_ref);
+		btrfs_merge_delayed_refs(fs_info, delayed_refs, locked_ref);
 
 		ret = btrfs_run_delayed_refs_for_head(trans, locked_ref,
 						      &actual_count);