writeback: Export inode_io_list_del()

Ext4 needs to remove inode from writeback lists after it is out of
visibility of its journalling machinery (which can still dirty the
inode). Export inode_io_list_del() for it.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20200421085445.5731-3-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/fs-writeback.c

@@ -1126,6 +1126,7 @@ void inode_io_list_del(struct inode *inode)
 	inode_io_list_del_locked(inode, wb);
 	spin_unlock(&wb->list_lock);
 }
+EXPORT_SYMBOL(inode_io_list_del);
 
 /*
  * mark an inode as under writeback on the sb