Struct BlockPointsToReadGuard 

pub struct BlockPointsToReadGuard<'a, M: MetaData> {
    b: Option<SpinLockGuard<'a, [u8; 4096]>>,
    _m: PhantomData<M>,
}

A read-only guard that provides typed access to a metadata block.

BlockPointsToReadGuard is returned by BlockPointsTo::read and allows immutable access to the contents of a 4096-byte disk block as a value of type M, which implements the MetaData trait.

Internally, it wraps a locked reference to the block’s byte array using a SpinLockGuard and casts it to the metadata type using unsafe pointer casting. The guard ensures that the block cannot be modified while borrowed immutably.

Use Case

Use this when you want to inspect metadata structures (like an inode table, superblock, or bitmap) without modifying them.

Fields

b: Option<SpinLockGuard<'a, [u8; 4096]>>

Spinlock guard for the raw block data.

_m: PhantomData<M>

Marker to associate the block with its metadata type.

Trait Implementations

impl<M: MetaData> Deref for BlockPointsToReadGuard<'_, M>

type Target = M

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<M: MetaData> Drop for BlockPointsToReadGuard<'_, M>

fn drop(&mut self)

Ensures the spinlock is released when the guard goes out of scope.