Re: [PATCH v7 0/3] FDP and per-io hints

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On 11.10.2024 10:56, Christoph Hellwig wrote:
On Thu, Oct 10, 2024 at 02:22:32PM +0200, Javier Gonzalez wrote:
Passthru is great for prototyping and getting insights on end-to-end
applicability. We see though that it is difficult to get a full solution
based on it, unless people implement a use-space layer tailored to their
use-case (e.g., a version SPDK's bdev). After the POC phase, most folks
that can use passthru prefer to move to block - with a validated
use-case it should be easier to get things upstream.

This is exactly where we are now.

That's a lot of marketing babble :)    What exact thing is missing
from the passthrough interface when using say spdx over io_uring?

The block layer provides a lot of functionality that passthru cannot
provide. A simple example would be splits. You know this :)

I am sure Jens and Keith can give you more specifics on their particular
reasons.


If you saw the comments from Christian on the inode space, there are a
few plumbing challenges. Do you have any patches we could look at?

I'm not sure what you refer to here.

This from Christian:
  https://lore.kernel.org/all/20240903-erfassen-bandmitglieder-32dfaeee66b2@brauner/




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