Re: [PATCH v4 1/6] fs: add write-stream management ioctls

Beside the issue pointed out in the comment there is another one
that came to my mind:

Right now there is no control what application can use the write streams.
Tis means a user could monopolize them, negatively affecting others,
even more so when hardware write stream support is added later.

I see two ways out of this:

 1) require privileges to use write streams
 2) have a rlimit for the numebr of streams per user

2) is by far nicer, but 1) might be easier to get things going to then
move to 2).