33 lines
1.2 KiB
C++
33 lines
1.2 KiB
C++
#include "fs/ext2/inode_table.h"
|
|
|
|
#include <mammoth/debug.h>
|
|
|
|
InodeTable::InodeTable(Ext2BlockReader& reader, BlockGroupDescriptor* bgdt)
|
|
: ext2_reader_(reader), bgdt_(bgdt) {
|
|
inode_tables_.Resize(ext2_reader_.NumberOfBlockGroups());
|
|
}
|
|
|
|
glcr::ErrorOr<Inode*> InodeTable::GetInode(uint64_t inode_num) {
|
|
uint64_t inodes_per_group = ext2_reader_.GetSuperblock()->inodes_per_group;
|
|
uint64_t block_group_num = (inode_num - 1) / inodes_per_group;
|
|
ASSIGN_OR_RETURN(Inode * root, GetRootOfInodeTable(block_group_num));
|
|
uint64_t local_index = (inode_num - 1) % inodes_per_group;
|
|
return reinterpret_cast<Inode*>(reinterpret_cast<uint64_t>(root) +
|
|
local_index * ext2_reader_.InodeSize());
|
|
}
|
|
|
|
glcr::ErrorOr<Inode*> InodeTable::GetRootOfInodeTable(
|
|
uint64_t block_group_num) {
|
|
if (block_group_num > ext2_reader_.NumberOfBlockGroups()) {
|
|
return glcr::INVALID_ARGUMENT;
|
|
}
|
|
|
|
if (!inode_tables_[block_group_num]) {
|
|
ASSIGN_OR_RETURN(
|
|
inode_tables_[block_group_num],
|
|
ext2_reader_.ReadBlocks(bgdt_[block_group_num].inode_table,
|
|
ext2_reader_.InodeTableBlockSize()));
|
|
}
|
|
return reinterpret_cast<Inode*>(inode_tables_[block_group_num].vaddr());
|
|
}
|