4 Dec
2025
4 Dec
'25
1:10 p.m.
On Thu, Dec 04, 2025 at 12:09:46PM +0100, Christian König wrote:
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?
This eventually ends up calling dma_buf_dynamic_attach and provides a way to find the dma_buf_attachment later in the I/O path.