btrfs: remove free space cache inode check in btrfs_truncate_inode_items

We no longer have inode cache feature, so this check is extraneous as
the only inode cache is in the tree_root, which is not marked as
SHAREABLE.
Reviewed-by: Filipe Manana <fdmanana@suse.com>
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/inode-item.c

@@ -477,12 +477,10 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 	BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY);
 
 	/*
-	 * For non-free space inodes and non-shareable roots, we want to back
-	 * off from time to time.  This means all inodes in subvolume roots,
-	 * reloc roots, and data reloc roots.
+	 * For shareable roots we want to back off from time to time, this turns
+	 * out to be subvolume roots, reloc roots, and data reloc roots.
 	 */
-	if (!btrfs_is_free_space_inode(inode) &&
-	    test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
+	if (test_bit(BTRFS_ROOT_SHAREABLE, &root->state))
 		be_nice = true;
 
 	path = btrfs_alloc_path();