Re: [PATCH for-next] io_uring: let to set a range for file slot allocation

[Jens Axboe <axboe@kernel.dk>]

On 6/25/22 4:55 AM, Pavel Begunkov wrote:
> From recently io_uring provides an option to allocate a file index for
> operation registering fixed files. However, it's utterly unusable with
> mixed approaches when for a part of files the userspace knows better
> where to place it, as it may race and users don't have any sane way to
> pick a slot and hoping it will not be taken.
> 
> Let the userspace to register a range of fixed file slots in which the
> auto-allocation happens. The use case is splittting the fixed table in
> two parts, where on of them is used for auto-allocation and another for
> slot-specified operations.

This looks pretty straight forward, and a useful addition to be able to
mix and match app and ring managed direct descriptors. I'll let others
comment on it first.

-- 
Jens Axboe