Re: [PATCH 0/5] allow dma-buf-io ctx reuse across files

[Pavel Begunkov <asml.silence@gmail.com>]

On 11/4/26 00:18, Pavel Begunkov wrote:
> Currently, dma-buf maps can only be used by the file they were
> registered with. This means that we can't open a new file, even if it
> comes from the same subsystem and point to the same block device and
> use it with an old dma-buf registration. That would be too restrictive
> for upcoming filsystem support, so lift it now and allow reusing
> contexts between files pointing to the same NVMe, even if they refer
> to different partitions.
> 
> To do that, we add a tag representing for each file, save it from
> the file passed during registration and use it to reject files
> which tags don't match it. Tags are set by subsystems creating
> files, should be unique and represent the instance of the
> subsystem.

Fwiw, sashiko raised good points, I'll need to address
them in v2.

-- 
Pavel Begunkov