Re: [PATCH 0/9] Support persistent reservation operations

[Stefan Hajnoczi]

On Wed, May 08, 2024 at 05:36:20PM +0800, Changqi Lu wrote:
> Hi,
> 
> I am going to introduce persistent reservation for QEMU block.
> There are three parts in this series:
> 
> Firstly, at the block layer, the commit abstracts seven APIs related to
> the persistent reservation command. These APIs including reading keys,
> reading reservations, registering, reserving, releasing, clearing and 
> preempting.
> 
> Next, the commit implements the necessary pr-related operation APIs for both 
> the
> SCSI protocol and NVMe protocol at the device layer. This ensures that the 
> necessary
> functionality is available for handling persistent reservations in these 
> protocols.
> 
> Finally, the commit includes adaptations to the iscsi driver at the driver 
> layer
> to verify the correct implementation and functionality of the changes.
> 
> With these changes, GFS works fine in the guest. Also, sg-utils(for SCSI 
> block) and
> nvme-cli(for NVMe block) work fine too.

What is the relationship to the existing PRManager functionality
(docs/interop/pr-helper.rst) where block/file-posix.c interprets SCSI
ioctls and sends persistent reservation requests to an external helper
process?

I wonder if block/file-posix.c can implement the new block driver
callbacks using pr_mgr (while keeping the existing scsi-generic
support).

Stefan

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