btrfs-progs: remove unused function wait_on_tree_block_writeback

This used to be a kernel stub but has been removed from kernel long time
ago.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/disk-io.h b/disk-io.h
index e257714b..cd4fe929 100644
--- a/disk-io.h
+++ b/disk-io.h
@@ -186,8 +186,6 @@ int btrfs_free_fs_root(struct btrfs_root *root);
 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid);
 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
-int wait_on_tree_block_writeback(struct btrfs_root *root,
-				 struct extent_buffer *buf);
 u32 btrfs_csum_data(char *data, u32 seed, size_t len);
 void btrfs_csum_final(u32 crc, u8 *result);