Miklos Szeredi <miklos@xxxxxxxxxx> wrote: > > BTW, I wonder what's the right locking for that sucker; overlayfs is > > probably too heavy - we are talking about copying a file from one fs to > > another, which can obviously take quite a while, so holding ->i_mutex on > > _parent_ all along is asking for very serious contention. > > Copy up is a once-in-a-lifetime event for an object. Optimizing it is > way down in the list of things to do. I'd drop splice in a jiffy if > it's in the way. Yes, but it could block the parent directory for a long time. I suspect it's fine if you can RCU walk through the parent, but if you have to grab a lock on it... David -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
