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[victoriafalls] Add InodeTable class to cache Inode info

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Drew Galbraith 2023-07-06 09:39:17 -07:00
parent 21c1a001ea
commit 52b4b273b7
7 changed files with 87 additions and 0 deletions
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44
sys/victoriafalls/fs/ext2/inode_table.cpp Normal file
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#include "fs/ext2/inode_table.h"
#include <mammoth/debug.h>
InodeTable::InodeTable(Ext2BlockReader& reader, BlockGroupDescriptor* bgdt)
: ext2_reader_(reader),
bgdt_(bgdt),
num_block_groups_(((reader.GetSuperblock()->blocks_count - 1) /
reader.GetSuperblock()->blocks_per_group) +
1),
inodes_per_group_(reader.GetSuperblock()->inodes_per_group) {
inode_tables_.Resize(num_block_groups_);
dbgln("EXT rev: %x", reader.GetSuperblock()->rev_level);
inode_size_ = reader.GetSuperblock()->rev_level >= 1
? reader.GetSuperblock()->inode_size
: 0x80;
}
glcr::ErrorOr<Inode*> InodeTable::GetInode(uint64_t inode_num) {
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 * inode_size_);
}
glcr::ErrorOr<Inode*> InodeTable::GetRootOfInodeTable(
uint64_t block_group_num) {
if (block_group_num > num_block_groups_) {
return glcr::INVALID_ARGUMENT;
}
if (!inode_tables_[block_group_num]) {
// FIXME: Don't hardcode block and inode size here.
uint64_t inode_table_size =
((inodes_per_group_ * inode_size_ - 1) / 1024) + 1;
dbgln("Reading %lx, %lx", bgdt_[block_group_num].inode_table,
inode_table_size);
ASSIGN_OR_RETURN(inode_tables_[block_group_num],
ext2_reader_.ReadBlocks(bgdt_[block_group_num].inode_table,
inode_table_size));
}
return reinterpret_cast<Inode*>(inode_tables_[block_group_num].vaddr());
}