34 lines
1.4 KiB
C++
34 lines
1.4 KiB
C++
#include "fs/ext2/inode_table.h"
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InodeTable::InodeTable(const glcr::SharedPtr<Ext2BlockReader>& reader,
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mmth::OwnedMemoryRegion&& bgdt_region)
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: ext2_reader_(reader),
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bgdt_region_(glcr::Move(bgdt_region)),
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bgdt_(reinterpret_cast<BlockGroupDescriptor*>(bgdt_region_.vaddr())) {
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inode_tables_.Resize(ext2_reader_->NumberOfBlockGroups());
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}
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glcr::ErrorOr<Inode*> InodeTable::GetInode(uint32_t inode_num) {
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uint64_t inodes_per_group = ext2_reader_->GetSuperblock()->inodes_per_group;
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uint64_t block_group_num = (inode_num - 1) / inodes_per_group;
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ASSIGN_OR_RETURN(Inode * root, GetRootOfInodeTable(block_group_num));
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uint64_t local_index = (inode_num - 1) % inodes_per_group;
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return reinterpret_cast<Inode*>(reinterpret_cast<uint64_t>(root) +
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local_index * ext2_reader_->InodeSize());
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}
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glcr::ErrorOr<Inode*> InodeTable::GetRootOfInodeTable(
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uint64_t block_group_num) {
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if (block_group_num > ext2_reader_->NumberOfBlockGroups()) {
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return glcr::INVALID_ARGUMENT;
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}
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if (!inode_tables_[block_group_num]) {
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ASSIGN_OR_RETURN(
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inode_tables_[block_group_num],
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ext2_reader_->ReadBlocks(bgdt_[block_group_num].inode_table,
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ext2_reader_->InodeTableBlockSize()));
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}
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return reinterpret_cast<Inode*>(inode_tables_[block_group_num].vaddr());
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}
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