95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
#include "fs/ext2/ext2_driver.h"
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#include <glacier/string/string.h>
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#include <mammoth/debug.h>
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glcr::ErrorOr<Ext2Driver> Ext2Driver::Init(ScopedDenaliClient&& denali) {
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ASSIGN_OR_RETURN(Ext2BlockReader reader,
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Ext2BlockReader::Init(glcr::Move(denali)));
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Superblock* superblock = reader.GetSuperblock();
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return Ext2Driver(glcr::Move(reader));
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}
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glcr::ErrorCode Ext2Driver::ProbePartition() {
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Superblock* superblock = ext2_reader_.GetSuperblock();
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if (superblock->magic != 0xEF53) {
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dbgln("Invalid EXT2 magic code: %x");
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return glcr::INVALID_ARGUMENT;
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}
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dbgln("Block size: 0x%x", 1024 << superblock->log_block_size);
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dbgln("Blocks: 0x%x (0x%x per group)", superblock->blocks_count,
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superblock->blocks_per_group);
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dbgln("Inodes: 0x%x (0x%x per group)", superblock->inodes_count,
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superblock->inodes_per_group);
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dbgln("Inode size: 0x%x", superblock->inode_size);
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dbgln("Mounts: 0x%x out of 0x%x", superblock->mnt_count,
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superblock->max_mnt_count);
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dbgln("State: %x", superblock->state);
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dbgln("Created by: %x", superblock->creator_os);
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ASSIGN_OR_RETURN(MappedMemoryRegion bgdt,
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ext2_reader_.ReadBlocks(ext2_reader_.BgdtBlockNum(),
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ext2_reader_.BgdtBlockSize()));
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BlockGroupDescriptor* bgds =
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reinterpret_cast<BlockGroupDescriptor*>(bgdt.vaddr());
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uint64_t num_block_groups = ext2_reader_.NumberOfBlockGroups();
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for (uint64_t i = 0; i < num_block_groups; i++) {
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dbgln("BGD %x", i);
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dbgln("Block Bitmap: %x", bgds[i].block_bitmap);
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dbgln("Inode Bitmap: %x", bgds[i].inode_bitmap);
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dbgln("Inode Table: %x", bgds[i].inode_table);
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dbgln("Free blocks: %x", bgds[i].free_blocks_count);
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dbgln("Free inodes: %x", bgds[i].free_inodes_count);
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}
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// FIXME: Move this to initialization.
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inode_table_ =
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glcr::UniquePtr<InodeTable>(new InodeTable(ext2_reader_, bgds));
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ASSIGN_OR_RETURN(Inode * root, inode_table_->GetInode(2));
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return ProbeDirectory(root);
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}
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glcr::ErrorCode Ext2Driver::ProbeDirectory(Inode* inode) {
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if (!(inode->mode & 0x4000)) {
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dbgln("Probing non-directory");
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return glcr::INVALID_ARGUMENT;
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}
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// This calculation is cursed.
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uint64_t real_block_cnt =
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(inode->blocks - 1) / (ext2_reader_.BlockSize() / 512) + 1;
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if (real_block_cnt > 12) {
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dbgln("Cant handle indirect blocks yet");
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return glcr::FAILED_PRECONDITION;
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}
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for (uint64_t i = 0; i < real_block_cnt; i++) {
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dbgln("Getting block %lx", inode->block[i]);
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ASSIGN_OR_RETURN(MappedMemoryRegion block,
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ext2_reader_.ReadBlock(inode->block[i]));
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uint64_t addr = block.vaddr();
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while (addr < block.vaddr() + ext2_reader_.BlockSize()) {
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DirEntry* entry = reinterpret_cast<DirEntry*>(addr);
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glcr::String name(entry->name, entry->name_len);
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switch (entry->file_type) {
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case kExt2FtFile:
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dbgln("FILE (0x%x): %s", entry->inode, name.cstr());
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break;
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case kExt2FtDirectory:
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dbgln("DIR (0x%x): %s", entry->inode, name.cstr());
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break;
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default:
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dbgln("UNK (0x%x): %s", entry->inode, name.cstr());
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}
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addr += entry->record_length;
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}
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}
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return glcr::OK;
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}
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