33 lines
1.2 KiB
C++
33 lines
1.2 KiB
C++
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#include "fs/ext2/ext2_block_reader.h"
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glcr::ErrorOr<Ext2BlockReader> Ext2BlockReader::Init(
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ScopedDenaliClient&& denali) {
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// Read 1024 bytes from 1024 offset.
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// FIXME: Don't assume 512 byte sectors somehow.
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ASSIGN_OR_RETURN(MappedMemoryRegion superblock, denali.ReadSectors(2, 2));
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return Ext2BlockReader(glcr::Move(denali), superblock);
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}
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Superblock* Ext2BlockReader::GetSuperblock() {
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return reinterpret_cast<Superblock*>(super_block_region_.vaddr());
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}
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uint64_t Ext2BlockReader::SectorsPerBlock() {
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return 1 << (GetSuperblock()->log_block_size + 1);
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}
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glcr::ErrorOr<MappedMemoryRegion> Ext2BlockReader::ReadBlock(
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uint64_t block_number) {
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return denali_.ReadSectors(block_number * SectorsPerBlock(),
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SectorsPerBlock());
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}
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glcr::ErrorOr<MappedMemoryRegion> Ext2BlockReader::ReadBlocks(
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uint64_t block_number, uint64_t num_blocks) {
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return denali_.ReadSectors(block_number * SectorsPerBlock(),
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num_blocks * SectorsPerBlock());
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}
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Ext2BlockReader::Ext2BlockReader(ScopedDenaliClient&& denali,
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MappedMemoryRegion super_block)
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: denali_(glcr::Move(denali)), super_block_region_(super_block) {}
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