btrfs: remove extent_io_tree::track_uptodate

Since commit 78361f64ff42 ("btrfs: remove unnecessary EXTENT_UPTODATE
state in buffered I/O path") we no longer check ->track_uptodate, remove
it.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -2232,7 +2232,6 @@ static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
 	RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
 	extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
 			    IO_TREE_BTREE_INODE_IO, inode);
-	BTRFS_I(inode)->io_tree.track_uptodate = false;
 	extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
 
 	BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root);

fs/btrfs/extent-io-tree.h

@@ -70,7 +70,6 @@ struct extent_io_tree {
 	struct btrfs_fs_info *fs_info;
 	void *private_data;
 	u64 dirty_bytes;
-	bool track_uptodate;
 
 	/* Who owns this io tree, should be one of IO_TREE_* */
 	u8 owner;

fs/btrfs/inode.c

@@ -8805,7 +8805,6 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
 	extent_io_tree_init(fs_info, &ei->file_extent_tree,
 			    IO_TREE_INODE_FILE_EXTENT, inode);
 	ei->io_failure_tree = RB_ROOT;
-	ei->io_tree.track_uptodate = true;
 	atomic_set(&ei->sync_writers, 0);
 	mutex_init(&ei->log_mutex);
 	btrfs_ordered_inode_tree_init(&ei->ordered_tree);