Module drive 

/drives/{id} PUT and PATCH bodies.

Per 21-api-compat-matrix.md /drives/{id} PUT:

• drive_id — ^[A-Za-z0-9_]{1,64}$ (DriveId newtype).
• path_on_host — SafePath (1024-byte cap, no NUL).
• cache_type — Unsafe | Writeback.
• io_engine — Sync | Async.
• partuuid — optional; when is_root_device true, threaded into root=PARTUUID=.
• socket (vhost-user) — A: accept-and-warn at config-load.

Diffs from upstream are intentionally absent at this layer; the deviations are enforced at the controller / VMM stage (e.g. vhost-user socket warning).

Structs

DriveConfig

Validated /drives/{id} PUT body.

DrivePatch

Validated /drives/{id} PATCH body.

RawDriveConfig

Raw /drives/{id} PUT body off the wire.

RawDrivePatch

Raw /drives/{id} PATCH body. Every mutable field optional.

Enums

CacheType

Caching policy for the block device. Mirrors upstream verbatim.

IoEngine

Block-device IO engine. Sync = blocking; Async = tokio::task::spawn_blocking.