Enum Filesystem 

pub enum Filesystem {
    Raw,
    Btrfs,
}

Filesystem to format the backing file with.

Raw matches the actual on-disk state: no formatting happens, the guest sees /dev/vda as a raw unformatted block device.

Non-Raw variants activate the template-cache lifecycle (see module docs). Selecting one requires the ktstr cache directory to live on a reflink-capable filesystem (btrfs or xfs) — the per-test fan-out uses FICLONE to clone the cached template image and would fail on tmpfs/ext4. The host must also have the formatter named by Self::mkfs_binary_name on PATH at template-build time so the template-VM initramfs can pack it.

Variants

Raw

No filesystem; raw block device. The guest sees /dev/vda as an unformatted volume of the configured capacity. Default.

Btrfs

btrfs filesystem. Per-test backing is a reflink clone of a host-cached, guest-formatted btrfs image at the configured capacity. On cache miss crate::vmm::disk_template::ensure_template boots a one-shot template VM that runs mkfs.btrfs /dev/vda inside the guest, caches the formatted image under the ktstr cache root, and returns the cached path. On cache hit crate::vmm::disk_template::clone_to_per_test FICLONE-clones the cached template into a per-test tempfile under the same cache filesystem. The cache directory must live on a btrfs/xfs mount, and mkfs.btrfs must be on the host PATH at template-build time. See crate::vmm::disk_template.

Trait Implementations

impl Clone for Filesystem

fn clone(&self) -> Filesystem

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Filesystem

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Filesystem

fn default() -> Filesystem

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Filesystem

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Filesystem

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Filesystem

fn eq(&self, other: &Filesystem) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Filesystem

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Filesystem

impl Eq for Filesystem

impl StructuralPartialEq for Filesystem