Re: [PATCH 2/9] io_uring: support user sqe ext flags

[Jens Axboe <axboe@kernel.dk>]

On 4/7/24 7:03 PM, Ming Lei wrote:
> sqe->flags is u8, and now we have used 7 bits, so take the last one for
> extending purpose.
> 
> If bit7(IOSQE_HAS_EXT_FLAGS_BIT) is 1, it means this sqe carries ext flags
> from the last byte(.ext_flags), or bit23~bit16 of sqe->uring_cmd_flags for
> IORING_OP_URING_CMD.
> 
> io_slot_flags() return value is converted to `ULL` because the affected bits
> are beyond 32bit now.

If we're extending flags, which is something we arguably need to do at
some point, I think we should have them be generic and not spread out.
If uring_cmd needs specific flags and don't have them, then we should
add it just for that.

-- 
Jens Axboe