[PATCHv2] nvmet-passthru: clear EUID/NGUID/UUID while using loop target

[Chaitanya Kulkarni]

On 9/21/2024 12:05 AM, Nilay Shroff wrote:
> When nvme passthru is configured using loop target, the clear_ids
> attribute is, by default, set to true. This attribute would ensure that
> EUID/NGUID/UUID is cleared for the loop passthru target.
> 
> The newer NVMe disk supporting the NVMe spec 1.3 or higher, typically,
> implements the support for "Namespace Identification Descriptor list"
> command. This command when issued from host returns EUID/NGUID/UUID
> assigned to the inquired namespace. Not clearing these values, while
> using nvme passthru using loop target, would result in NVMe host driver
> rejecting the namespace. This check was implemented in the commit
> 2079f41ec6ff ("nvme: check that EUI/GUID/UUID are globally unique").
> 
> The fix implemented in this commit ensure that when host issues ns-id
> descriptor list command, the EUID/NGUID/UUID are cleared by passthru
> target. In fact, the function nvmet_passthru_override_id_descs() which
> clears those unique ids already exits, so we just need to ensure that
> ns-id descriptor list command falls through the corretc code path. And
> while we're at it, we also combines the three passthru admin command
> cases together which shares the same code.
> 
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> Signed-off-by: Nilay Shroff <nilay at linux.ibm.com>
> ---

Looks good.

Reviewed-by: Chaitanya Kulkarni <kch at nvidia.com>

-ck