Re: [PATCH V2] nvme: Add module reference counting for multipath devices

On 25/08/2026 22:11, Wen Xiong wrote:
> On 2026-08-22 19:46, Sagi Grimberg wrote:
>
>> OK, I now read the original report regarding nvme root device. please 
>> disregard.
>
> Hi Keith and Sagi,
>
> For single port nvme device, I found out:
> If NS does not have any filesystems configured and the root filesystem 
> is located on another SCSI disk, the NVMe device's reference count is 0.
> When a filesystem is created on NS, the NVMe device's reference count 
> increases to 1.
>
> With my V2 patch for multipath devices,
> Nvme's reference count always increases if NS doesn't have any 
> filesystem configured.
> If nvme1 has 1 NS without any filesystem, reference count is 2 after 
> system boots up.
>
> Should Nvme's reference count increases if no filesystem configured on 
> a NS?

No I dont think it should