45 lines
1.8 KiB
C++
45 lines
1.8 KiB
C++
#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());
|
|
}
|