fxfs::object_store::journal::super_block

Struct SuperBlockManager

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pub struct SuperBlockManager { /* private fields */ }

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This encapsulates the A/B alternating super-block logic. All super-block load/save operations should be via the methods on this type.

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impl SuperBlockManager

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pub fn new() -> Self

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pub async fn load( &self, device: Arc<dyn Device>, block_size: u64, ) -> Result<(SuperBlockHeader, ObjectStore), Error>

Loads both A/B super-blocks and root_parent ObjectStores and and returns the newest valid pair. Also ensures the next superblock updated via |save| will be the other instance.

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pub async fn save( &self, super_block_header: SuperBlockHeader, filesystem: Arc<FxFilesystem>, root_parent: LayerSet<ObjectKey, ObjectValue>, ) -> Result<(), Error>

Writes the provided superblock and root_parent ObjectStore to the device. Requires that the filesystem is fully loaded and writable as this may require allocation.

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impl !UnwindSafe for SuperBlockManager

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