Struct VolumeMapper

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pub struct VolumeMapper { /* private fields */ }

Expand description

Manages a driver-backed MapperSession for an EROFS volume.

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impl VolumeMapper

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pub fn new( session: MapperSessionSynchronousProxy, mapping_vmo: Vmo, file_offset: u64, ) -> Result<Self, Status>

Creates a new VolumeMapper over an established MapperSession and its mapping_vmo.

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pub fn open_with_session( file_offset: u64, open_fn: impl FnOnce(Vmo, ServerEnd<MapperSessionMarker>) -> Result<(), Status>, ) -> Result<Self, Status>

Allocates a mapping_vmo, invokes open_fn to bind the server end of a MapperSession, and returns the initialized VolumeMapper.

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pub fn get_or_create_vmo( &self, fs: &ErofsFilesystem, node: &FileNode, ) -> Result<Vmo, Status>

Returns a read-only VMO handle for node.

Driver-backed pager VMOs (FlatPlain and FlatInline) are cached in vmos_by_nid for the lifetime of the VolumeMapper so that their driver mappings stay registered even if a VFS node is evicted while a process still has the VMO mapped, and so subsequent opens reuse the existing VMO. Anonymous VMOs created for empty or compressed files (key == None) are returned directly so their memory can be reclaimed once the caller drops the VMO.

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pub fn close_file(&self, key: u64)

Closes a previously mapped file key in both the block driver and BlobPagerAndVerifier.

Auto Trait Implementations§

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impl UnwindSafe for VolumeMapper

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impl<T> Any for T
where T: 'static + ?Sized,

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impl<T, D> Encode<Ambiguous1, D> for T
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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more

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impl<T, D> Encode<Ambiguous2, D> for T
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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more

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