Enum SnapMode 

pub enum SnapMode {
    Zfs,
    Btrfs,
    External,
}

Inner Operations

assume:

• root volume of zfs is zfs
• root volume of btrfs is /btrfs
• business data is stored in <root volume>/data
• target block height to recover is 123456

snapshot

# zfs filesystem
zfs destroy zfs/data@123456 2>/dev/null
zfs snapshot zfs/data@123456

# btrfs filesystem
rm -rf /btrfs/data@123456 2>/dev/null
btrfs subvolume snapshot /btrfs/data /btrfs/data@123456

rollback

# zfs filesystem
zfs rollback -r zfs/data@123456

# btrfs filesystem
rm -rf /btrfs/data || exit 1
btrfs subvolume snapshot /btrfs/data@123456 /btrfs/data

Variants

Zfs

Available on some Linux distributions and FreeBSD

• Ubuntu Linux
• Gentoo Linux
• FreeBSD
• …

Btrfs

Available on most Linux distributions, but its user experience is worse than zfs

External

Rely on an external independent process

Implementations

impl SnapMode

pub fn from_string(m: &str) -> Result<Self>

pub fn guess(volume: &str) -> Result<Self>

Try to determine which mode can be used on the target volume

NOTE: not suitable for the External mode.

Trait Implementations

impl Clone for SnapMode

fn clone(&self) -> SnapMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SnapMode

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

Formats the value using the given formatter.

impl Default for SnapMode

fn default() -> Self

Returns the “default value” for a type.

impl Display for SnapMode

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

Formats the value using the given formatter.

impl FromStr for SnapMode

type Err = String

The associated error which can be returned from parsing.

fn from_str(s: &str) -> StdResult<Self, Self::Err>

Parses a string s to return a value of this type.

impl Copy for SnapMode