Re: [LSF/MM/BPF TOPIC] File system checksum offload

hch
2025-02-03T08:30:16Z

On Mon, Feb 03, 2025 at 08:26:33AM +0000, Matthew Wilcox wrote:
> so this is a block layer issue if it's not set.

And even if the flag is set direct I/O ignores it. So while passing
through such a flag through virtio might be useful we need to eventually
sort out the fact that direct I/O doesn't respect it.

Locking up any thread touching memory under direct I/O might be quite
heavy handed, so this means bounce buffering on page fault. We had
plenty of discussion of this before, but I don't think anyone actually
looked into implementing it.