On 12/4/25 12:07, Christoph Hellwig wrote: > On Thu, Dec 04, 2025 at 11:46:45AM +0100, Christian König wrote: >> On 11/23/25 23:51, Pavel Begunkov wrote: >>> Add a file callback that maps a dmabuf for the given file and returns >>> an opaque token of type struct dma_token representing the mapping. >> >> I'm really scratching my head what you mean with that? >> >> And why the heck would we need to pass a DMA-buf to a struct file? > > I find the naming pretty confusing a well. But what this does is to > tell the file system/driver that it should expect a future > read_iter/write_iter operation that takes data from / puts data into > the dmabuf passed to this operation.
That explanation makes much more sense. The remaining question is why does the underlying file system / driver needs to know that it will get addresses from a DMA-buf? Regards, Christian.
