Kernel: Split ext2 implementation to multiple files
This commit is contained in:
Bananymous
396
kernel/kernel/FS/Ext2/FileSystem.cpp
Normal file
396
kernel/kernel/FS/Ext2/FileSystem.cpp
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@@ -0,0 +1,396 @@
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#include <BAN/ScopeGuard.h>
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#include <kernel/FS/Ext2/FileSystem.h>
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#define EXT2_DEBUG_PRINT 1
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namespace Kernel
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{
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BAN::ErrorOr<Ext2FS*> Ext2FS::create(Partition& partition)
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{
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Ext2FS* ext2fs = new Ext2FS(partition);
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if (ext2fs == nullptr)
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return BAN::Error::from_errno(ENOMEM);
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BAN::ScopeGuard guard([ext2fs] { delete ext2fs; });
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TRY(ext2fs->initialize_superblock());
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TRY(ext2fs->initialize_root_inode());
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guard.disable();
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return ext2fs;
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}
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BAN::ErrorOr<void> Ext2FS::initialize_superblock()
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{
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// Read superblock from disk
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{
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const uint32_t sector_size = m_partition.device().sector_size();
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ASSERT(1024 % sector_size == 0);
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const uint32_t lba = 1024 / sector_size;
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const uint32_t sector_count = BAN::Math::div_round_up<uint32_t>(sizeof(Ext2::Superblock), sector_size);
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BAN::Vector<uint8_t> superblock_buffer;
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TRY(superblock_buffer.resize(sector_count * sector_size));
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TRY(m_partition.read_sectors(lba, sector_count, superblock_buffer.data()));
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memcpy(&m_superblock, superblock_buffer.data(), sizeof(Ext2::Superblock));
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}
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if (m_superblock.magic != Ext2::Enum::SUPER_MAGIC)
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return BAN::Error::from_error_code(ErrorCode::Ext2_Invalid);
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if (m_superblock.rev_level == Ext2::Enum::GOOD_OLD_REV)
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{
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memset(m_superblock.__extension_start, 0, sizeof(Ext2::Superblock) - offsetof(Ext2::Superblock, Ext2::Superblock::__extension_start));
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m_superblock.first_ino = Ext2::Enum::GOOD_OLD_FIRST_INO;
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m_superblock.inode_size = Ext2::Enum::GOOD_OLD_INODE_SIZE;
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}
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const uint32_t number_of_block_groups = BAN::Math::div_round_up(superblock().inodes_count, superblock().inodes_per_group);
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const uint32_t number_of_block_groups_check = BAN::Math::div_round_up(superblock().blocks_count, superblock().blocks_per_group);
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if (number_of_block_groups != number_of_block_groups_check)
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return BAN::Error::from_error_code(ErrorCode::Ext2_Corrupted);
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if (!(m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_FILETYPE))
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{
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dwarnln("Directory entries without filetype not supported");
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return BAN::Error::from_errno(ENOTSUP);
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}
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if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_COMPRESSION)
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{
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dwarnln("Required FEATURE_INCOMPAT_COMPRESSION");
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return BAN::Error::from_errno(ENOTSUP);
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}
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if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_JOURNAL_DEV)
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{
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dwarnln("Required FEATURE_INCOMPAT_JOURNAL_DEV");
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return BAN::Error::from_errno(ENOTSUP);
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}
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if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_META_BG)
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{
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dwarnln("Required FEATURE_INCOMPAT_META_BG");
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return BAN::Error::from_errno(ENOTSUP);
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}
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if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_RECOVER)
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{
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dwarnln("Required FEATURE_INCOMPAT_RECOVER");
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return BAN::Error::from_errno(ENOTSUP);
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}
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#if EXT2_DEBUG_PRINT
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dprintln("EXT2");
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dprintln(" inodes {}", m_superblock.inodes_count);
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dprintln(" blocks {}", m_superblock.blocks_count);
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dprintln(" version {}.{}", m_superblock.rev_level, m_superblock.minor_rev_level);
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dprintln(" first data at {}", m_superblock.first_data_block);
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dprintln(" block size {}", 1024 << m_superblock.log_block_size);
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dprintln(" inode size {}", m_superblock.inode_size);
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dprintln(" inodes/group {}", m_superblock.inodes_per_group);
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#endif
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{
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BAN::Vector<uint8_t> block_buffer;
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TRY(block_buffer.resize(block_size()));
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if (superblock().rev_level == Ext2::Enum::GOOD_OLD_REV)
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{
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// In revision 0 all blockgroups contain superblock backup
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TRY(m_superblock_backups.reserve(number_of_block_groups - 1));
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for (uint32_t i = 1; i < number_of_block_groups; i++)
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MUST(block_buffer.push_back(i));
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}
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else
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{
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// In other revision superblock backups are on blocks 1 and powers of 3, 5 and 7
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TRY(m_superblock_backups.push_back(1));
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for (uint32_t i = 3; i < number_of_block_groups; i *= 3)
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TRY(m_superblock_backups.push_back(i));
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for (uint32_t i = 5; i < number_of_block_groups; i *= 5)
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TRY(m_superblock_backups.push_back(i));
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for (uint32_t i = 7; i < number_of_block_groups; i *= 7)
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TRY(m_superblock_backups.push_back(i));
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// We don't really care if this succeeds or not
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(void)m_superblock_backups.shrink_to_fit();
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}
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for (uint32_t bg : m_superblock_backups)
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{
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read_block(superblock().first_data_block + superblock().blocks_per_group * bg, block_buffer.span());
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Ext2::Superblock& superblock_backup = *(Ext2::Superblock*)block_buffer.data();
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if (superblock_backup.magic != Ext2::Enum::SUPER_MAGIC)
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derrorln("superblock backup at block {} is invalid ({4H})", bg, superblock_backup.magic);
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}
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}
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return {};
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}
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BAN::ErrorOr<void> Ext2FS::initialize_root_inode()
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{
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m_root_inode = TRY(Ext2Inode::create(*this, Ext2::Enum::ROOT_INO));
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#if EXT2_DEBUG_PRINT
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dprintln("root inode:");
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dprintln(" created {}", root_inode()->ctime().tv_sec);
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dprintln(" modified {}", root_inode()->mtime().tv_sec);
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dprintln(" accessed {}", root_inode()->atime().tv_sec);
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#endif
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return {};
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}
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BAN::ErrorOr<uint32_t> Ext2FS::create_inode(const Ext2::Inode& ext2_inode)
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{
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ASSERT(ext2_inode.size == 0);
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if (m_superblock.free_inodes_count == 0)
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return BAN::Error::from_errno(ENOSPC);
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const uint32_t block_size = this->block_size();
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BAN::Vector<uint8_t> bgd_buffer;
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TRY(bgd_buffer.resize(block_size));
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BAN::Vector<uint8_t> inode_bitmap;
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TRY(inode_bitmap.resize(block_size));
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uint32_t current_group = -1;
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BlockLocation bgd_location {};
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Ext2::BlockGroupDescriptor* bgd = nullptr;
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for (uint32_t ino = superblock().inodes_per_group + 1; ino <= superblock().inodes_count; ino++)
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{
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const uint32_t ino_group = (ino - 1) / superblock().inodes_per_group;
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const uint32_t ino_index = (ino - 1) % superblock().inodes_per_group;
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if (ino_group != current_group)
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{
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current_group = ino_group;
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bgd_location = locate_block_group_descriptior(current_group);
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read_block(bgd_location.block, bgd_buffer.span());
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bgd = (Ext2::BlockGroupDescriptor*)(bgd_buffer.data() + bgd_location.offset);
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if (bgd->free_inodes_count == 0)
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{
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ino = superblock().first_ino + (current_group + 1) * superblock().inodes_per_group - 1;
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continue;
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}
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read_block(bgd->inode_bitmap, inode_bitmap.span());
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}
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const uint32_t ino_bitmap_byte = ino_index / 8;
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const uint32_t ino_bitmap_bit = ino_index % 8;
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if (inode_bitmap[ino_bitmap_byte] & (1 << ino_bitmap_bit))
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continue;
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inode_bitmap[ino_bitmap_byte] |= 1 << ino_bitmap_bit;
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write_block(bgd->inode_bitmap, inode_bitmap.span());
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bgd->free_inodes_count--;
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write_block(bgd_location.block, bgd_buffer.span());
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const uint32_t inode_table_offset = ino_index * superblock().inode_size;
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const BlockLocation inode_location
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{
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.block = inode_table_offset / block_size + bgd->inode_table,
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.offset = inode_table_offset % block_size
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};
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dprintln("allocated inode {} at offset {2H}",
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ino,
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2048 + (inode_location.block - 2) * block_size + inode_location.offset
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);
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dprintln("bitmap byte at {2H} with bit {2H}",
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2048 + (bgd->inode_bitmap - 2) * block_size + ino_bitmap_byte,
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1 << ino_bitmap_bit
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);
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// NOTE: we don't need inode bitmap anymore, so we can reuse it
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auto& inode_buffer = inode_bitmap;
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read_block(inode_location.block, inode_buffer.span());
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memcpy(inode_buffer.data() + inode_location.offset, &ext2_inode, sizeof(Ext2::Inode));
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if (superblock().inode_size > sizeof(Ext2::Inode))
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memset(inode_buffer.data() + inode_location.offset + sizeof(Ext2::Inode), 0, superblock().inode_size - sizeof(Ext2::Inode));
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write_block(inode_location.block, inode_buffer.span());
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m_superblock.free_inodes_count--;
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sync_superblock();
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return ino;
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}
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derrorln("Corrupted file system. Superblock indicates free inodes but none were found.");
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return BAN::Error::from_error_code(ErrorCode::Ext2_Corrupted);
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}
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void Ext2FS::read_block(uint32_t block, BAN::Span<uint8_t> buffer)
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{
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const uint32_t sector_size = m_partition.device().sector_size();
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const uint32_t block_size = this->block_size();
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const uint32_t sectors_per_block = block_size / sector_size;
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const uint32_t sectors_before = 2048 / sector_size;
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ASSERT(block >= 2);
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ASSERT(buffer.size() >= block_size);
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MUST(m_partition.read_sectors(sectors_before + (block - 2) * sectors_per_block, sectors_per_block, buffer.data()));
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}
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void Ext2FS::write_block(uint32_t block, BAN::Span<const uint8_t> buffer)
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{
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const uint32_t sector_size = m_partition.device().sector_size();
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const uint32_t block_size = this->block_size();
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const uint32_t sectors_per_block = block_size / sector_size;
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const uint32_t sectors_before = 2048 / sector_size;
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ASSERT(block >= 2);
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ASSERT(buffer.size() >= block_size);
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MUST(m_partition.write_sectors(sectors_before + (block - 2) * sectors_per_block, sectors_per_block, buffer.data()));
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}
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void Ext2FS::sync_superblock()
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{
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const uint32_t sector_size = m_partition.device().sector_size();
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ASSERT(1024 % sector_size == 0);
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const uint32_t superblock_bytes =
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(m_superblock.rev_level == Ext2::Enum::GOOD_OLD_REV)
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? offsetof(Ext2::Superblock, __extension_start)
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: sizeof(Ext2::Superblock);
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const uint32_t lba = 1024 / sector_size;
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const uint32_t sector_count = BAN::Math::div_round_up<uint32_t>(superblock_bytes, sector_size);
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BAN::Vector<uint8_t> superblock_buffer;
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MUST(superblock_buffer.resize(sector_count * sector_size));
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MUST(m_partition.read_sectors(lba, sector_count, superblock_buffer.data()));
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if (memcmp(superblock_buffer.data(), &m_superblock, superblock_bytes))
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{
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memcpy(superblock_buffer.data(), &m_superblock, superblock_bytes);
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MUST(m_partition.write_sectors(lba, sector_count, superblock_buffer.data()));
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}
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}
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BAN::ErrorOr<uint32_t> Ext2FS::reserve_free_block(uint32_t primary_bgd)
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{
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if (m_superblock.r_blocks_count >= m_superblock.free_blocks_count)
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return BAN::Error::from_errno(ENOSPC);
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const uint32_t block_size = this->block_size();
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BAN::Vector<uint8_t> bgd_buffer;
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TRY(bgd_buffer.resize(block_size));
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BAN::Vector<uint8_t> block_bitmap;
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TRY(block_bitmap.resize(block_size));
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auto check_block_group =
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[&](uint32_t block_group) -> uint32_t
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{
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auto bgd_location = locate_block_group_descriptior(block_group);
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read_block(bgd_location.block, bgd_buffer.span());
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auto& bgd = *(Ext2::BlockGroupDescriptor*)(bgd_buffer.data() + bgd_location.offset);
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if (bgd.free_blocks_count == 0)
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return 0;
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read_block(bgd.block_bitmap, block_bitmap.span());
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for (uint32_t block_offset = 0; block_offset < m_superblock.blocks_per_group; block_offset++)
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{
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uint32_t byte = block_offset / 8;
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uint32_t bit = block_offset % 8;
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if (block_bitmap[byte] & (1 << bit))
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continue;
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block_bitmap[byte] |= 1 << bit;
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write_block(bgd.block_bitmap, block_bitmap.span());
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bgd.free_blocks_count--;
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write_block(bgd_location.block, bgd_buffer.span());
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m_superblock.free_blocks_count--;
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sync_superblock();
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return m_superblock.first_data_block + m_superblock.blocks_per_group * block_group + block_offset;
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}
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derrorln("Corrupted file system. Block group descriptor indicates free blocks but none were found");
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return 0;
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};
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if (auto ret = check_block_group(primary_bgd))
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return ret;
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uint32_t number_of_block_groups = BAN::Math::div_round_up(m_superblock.blocks_count, m_superblock.blocks_per_group);
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for (uint32_t block_group = 0; block_group < number_of_block_groups; block_group++)
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if (block_group != primary_bgd)
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if (auto ret = check_block_group(block_group))
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return ret;
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derrorln("Corrupted file system. Superblock indicates free blocks but none were found.");
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return BAN::Error::from_error_code(ErrorCode::Ext2_Corrupted);
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}
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BAN::ErrorOr<Ext2FS::BlockLocation> Ext2FS::locate_inode(uint32_t ino)
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{
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ASSERT(ino < superblock().inodes_count);
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const uint32_t block_size = this->block_size();
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BAN::Vector<uint8_t> bgd_buffer;
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TRY(bgd_buffer.resize(block_size));
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const uint32_t inode_group = (ino - 1) / superblock().inodes_per_group;
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const uint32_t inode_index = (ino - 1) % superblock().inodes_per_group;
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auto bgd_location = locate_block_group_descriptior(inode_group);
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read_block(bgd_location.block, bgd_buffer.span());
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auto& bgd = *(Ext2::BlockGroupDescriptor*)(bgd_buffer.data() + bgd_location.offset);
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const uint32_t inode_byte_offset = inode_index * superblock().inode_size;
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BlockLocation location
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{
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.block = inode_byte_offset / block_size + bgd.inode_table,
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.offset = inode_byte_offset % block_size
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};
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#if VERIFY_INODE_EXISTANCE
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const uint32_t inode_bitmap_block = bgd.inode_bitmap;
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// NOTE: we can reuse the bgd_buffer since it is not needed anymore
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auto& inode_bitmap = bgd_buffer;
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read_block(inode_bitmap_block, inode_bitmap.span());
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const uint32_t byte = inode_index / 8;
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const uint32_t bit = inode_index % 8;
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ASSERT(inode_bitmap[byte] & (1 << bit));
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#endif
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return location;
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}
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Ext2FS::BlockLocation Ext2FS::locate_block_group_descriptior(uint32_t group_index)
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{
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const uint32_t block_size = this->block_size();
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const uint32_t block_group_count = BAN::Math::div_round_up(superblock().inodes_count, superblock().inodes_per_group);
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ASSERT(group_index < block_group_count);
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// Block Group Descriptor table is always after the superblock
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// Superblock begins at byte 1024 and is exactly 1024 bytes wide
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const uint32_t bgd_byte_offset = 2048 + sizeof(Ext2::BlockGroupDescriptor) * group_index;
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return
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{
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.block = bgd_byte_offset / block_size,
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.offset = bgd_byte_offset % block_size
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};
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}
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}
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@@ -1,163 +1,13 @@
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#include <BAN/ScopeGuard.h>
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#include <BAN/StringView.h>
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#include <kernel/FS/Ext2.h>
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#include <BAN/Function.h>
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#include <kernel/FS/Ext2/FileSystem.h>
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#include <kernel/FS/Ext2/Inode.h>
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#include <kernel/Timer/Timer.h>
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#define EXT2_DEBUG_PRINT 0
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#define VERIFY_INODE_EXISTANCE 1
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#define EXT2_DEBUG_PRINT 1
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namespace Kernel
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{
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namespace Ext2::Enum
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{
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constexpr uint16_t SUPER_MAGIC = 0xEF53;
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enum State
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{
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VALID_FS = 1,
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||||
ERROR_FS = 2,
|
||||
};
|
||||
|
||||
enum Errors
|
||||
{
|
||||
ERRORS_CONTINUE = 1,
|
||||
ERRORS_RO = 2,
|
||||
ERRORS_PANIC = 3,
|
||||
};
|
||||
|
||||
enum CreatorOS
|
||||
{
|
||||
OS_LINUX = 0,
|
||||
OS_HURD = 1,
|
||||
OS_MASIX = 2,
|
||||
OS_FREEBSD = 3,
|
||||
OS_LITES = 4,
|
||||
};
|
||||
|
||||
enum RevLevel
|
||||
{
|
||||
GOOD_OLD_REV = 0,
|
||||
DYNAMIC_REV = 1,
|
||||
};
|
||||
|
||||
enum Rev0Constant
|
||||
{
|
||||
GOOD_OLD_FIRST_INO = 11,
|
||||
GOOD_OLD_INODE_SIZE = 128,
|
||||
};
|
||||
|
||||
enum FeatureCompat
|
||||
{
|
||||
FEATURE_COMPAT_DIR_PREALLOC = 0x0001,
|
||||
FEATURE_COMPAT_IMAGIC_INODES = 0x0002,
|
||||
FEATURE_COMPAT_HAS_JOURNAL = 0x0004,
|
||||
FEATURE_COMPAT_EXT_ATTR = 0x0008,
|
||||
FEATURE_COMPAT_RESIZE_INO = 0x0010,
|
||||
FEATURE_COMPAT_DIR_INDEX = 0x0020,
|
||||
};
|
||||
|
||||
enum FeaturesIncompat
|
||||
{
|
||||
FEATURE_INCOMPAT_COMPRESSION = 0x0001,
|
||||
FEATURE_INCOMPAT_FILETYPE = 0x0002,
|
||||
FEATURE_INCOMPAT_RECOVER = 0x0004,
|
||||
FEATURE_INCOMPAT_JOURNAL_DEV = 0x0008,
|
||||
FEATURE_INCOMPAT_META_BG = 0x0010,
|
||||
};
|
||||
|
||||
enum FeaturesRoCompat
|
||||
{
|
||||
FEATURE_RO_COMPAT_SPARSE_SUPER = 0x0001,
|
||||
FEATURE_RO_COMPAT_LARGE_FILE = 0x0002,
|
||||
FEATURE_RO_COMPAT_BTREE_DIR = 0x0004,
|
||||
};
|
||||
|
||||
enum AlgoBitmap
|
||||
{
|
||||
LZV1_ALG = 0,
|
||||
LZRW3A_ALG = 1,
|
||||
GZIP_ALG = 2,
|
||||
BZIP2_ALG = 3,
|
||||
LZO_ALG = 4,
|
||||
};
|
||||
|
||||
enum ReservedInodes
|
||||
{
|
||||
BAD_INO = 1,
|
||||
ROOT_INO = 2,
|
||||
ACL_IDX_INO = 3,
|
||||
ACL_DATA_INO = 4,
|
||||
BOOT_LOADER_INO = 5,
|
||||
UNDEL_DIR_INO = 6,
|
||||
};
|
||||
|
||||
enum InodeMode
|
||||
{
|
||||
// -- file format --
|
||||
IFSOCK = 0xC000,
|
||||
IFLNK = 0xA000,
|
||||
IFREG = 0x8000,
|
||||
IFBLK = 0x6000,
|
||||
IFDIR = 0x4000,
|
||||
IFCHR = 0x2000,
|
||||
IFIFO = 0x1000,
|
||||
|
||||
// -- process execution user/group override --
|
||||
ISUID = 0x0800,
|
||||
ISGID = 0x0400,
|
||||
ISVTX = 0x0200,
|
||||
|
||||
// -- access rights --
|
||||
IRUSR = 0x0100,
|
||||
IWUSR = 0x0080,
|
||||
IXUSR = 0x0040,
|
||||
IRGRP = 0x0020,
|
||||
IWGRP = 0x0010,
|
||||
IXGRP = 0x0008,
|
||||
IROTH = 0x0004,
|
||||
IWOTH = 0x0002,
|
||||
IXOTH = 0x0001,
|
||||
};
|
||||
|
||||
enum InodeFlags
|
||||
{
|
||||
SECRM_FL = 0x00000001,
|
||||
UNRM_FL = 0x00000002,
|
||||
COMPR_FL = 0x00000004,
|
||||
SYNC_FL = 0x00000008,
|
||||
IMMUTABLE_FL = 0x00000010,
|
||||
APPEND_FL = 0x00000020,
|
||||
NODUMP_FL = 0x00000040,
|
||||
NOATIME_FL = 0x00000080,
|
||||
// -- Reserved for compression usage --
|
||||
DIRTY_FL = 0x00000100,
|
||||
COMPRBLK_FL = 0x00000200,
|
||||
NOCOMPR_FL = 0x00000400,
|
||||
ECOMPR_FL = 0x00000800,
|
||||
// -- End of compression flags --
|
||||
BTREE_FL = 0x00001000,
|
||||
INDEX_FL = 0x00001000,
|
||||
IMAGIC_FL = 0x00002000,
|
||||
JOURNAL_DATA_FL = 0x00004000,
|
||||
RESERVED_FL = 0x80000000,
|
||||
};
|
||||
|
||||
enum FileType
|
||||
{
|
||||
UNKNOWN = 0,
|
||||
REG_FILE = 1,
|
||||
DIR = 2,
|
||||
CHRDEV = 3,
|
||||
BLKDEV = 4,
|
||||
FIFO = 5,
|
||||
SOCK = 6,
|
||||
SYMLINK = 7,
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
blksize_t Ext2Inode::blksize() const
|
||||
{
|
||||
return m_fs.block_size();
|
||||
@@ -556,7 +406,7 @@ namespace Kernel
|
||||
.mtime = (uint32_t)current_time.tv_sec,
|
||||
.dtime = 0,
|
||||
.gid = (uint16_t)gid,
|
||||
.links_count = 1,
|
||||
.links_count = 5,
|
||||
.blocks = 0,
|
||||
.flags = 0,
|
||||
.osd1 = 0,
|
||||
@@ -725,383 +575,4 @@ needs_new_block:
|
||||
return BAN::Error::from_errno(ENOENT);
|
||||
}
|
||||
|
||||
BAN::ErrorOr<Ext2FS*> Ext2FS::create(Partition& partition)
|
||||
{
|
||||
Ext2FS* ext2fs = new Ext2FS(partition);
|
||||
if (ext2fs == nullptr)
|
||||
return BAN::Error::from_errno(ENOMEM);
|
||||
BAN::ScopeGuard guard([ext2fs] { delete ext2fs; });
|
||||
TRY(ext2fs->initialize_superblock());
|
||||
TRY(ext2fs->initialize_root_inode());
|
||||
guard.disable();
|
||||
return ext2fs;
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> Ext2FS::initialize_superblock()
|
||||
{
|
||||
// Read superblock from disk
|
||||
{
|
||||
const uint32_t sector_size = m_partition.device().sector_size();
|
||||
ASSERT(1024 % sector_size == 0);
|
||||
|
||||
const uint32_t lba = 1024 / sector_size;
|
||||
const uint32_t sector_count = BAN::Math::div_round_up<uint32_t>(sizeof(Ext2::Superblock), sector_size);
|
||||
|
||||
BAN::Vector<uint8_t> superblock_buffer;
|
||||
TRY(superblock_buffer.resize(sector_count * sector_size));
|
||||
|
||||
TRY(m_partition.read_sectors(lba, sector_count, superblock_buffer.data()));
|
||||
|
||||
memcpy(&m_superblock, superblock_buffer.data(), sizeof(Ext2::Superblock));
|
||||
}
|
||||
|
||||
if (m_superblock.magic != Ext2::Enum::SUPER_MAGIC)
|
||||
return BAN::Error::from_error_code(ErrorCode::Ext2_Invalid);
|
||||
|
||||
if (m_superblock.rev_level == Ext2::Enum::GOOD_OLD_REV)
|
||||
{
|
||||
memset(m_superblock.__extension_start, 0, sizeof(Ext2::Superblock) - offsetof(Ext2::Superblock, Ext2::Superblock::__extension_start));
|
||||
m_superblock.first_ino = Ext2::Enum::GOOD_OLD_FIRST_INO;
|
||||
m_superblock.inode_size = Ext2::Enum::GOOD_OLD_INODE_SIZE;
|
||||
}
|
||||
|
||||
const uint32_t number_of_block_groups = BAN::Math::div_round_up(superblock().inodes_count, superblock().inodes_per_group);
|
||||
const uint32_t number_of_block_groups_check = BAN::Math::div_round_up(superblock().blocks_count, superblock().blocks_per_group);
|
||||
if (number_of_block_groups != number_of_block_groups_check)
|
||||
return BAN::Error::from_error_code(ErrorCode::Ext2_Corrupted);
|
||||
|
||||
if (!(m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_FILETYPE))
|
||||
{
|
||||
dwarnln("Directory entries without filetype not supported");
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_COMPRESSION)
|
||||
{
|
||||
dwarnln("Required FEATURE_INCOMPAT_COMPRESSION");
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_JOURNAL_DEV)
|
||||
{
|
||||
dwarnln("Required FEATURE_INCOMPAT_JOURNAL_DEV");
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_META_BG)
|
||||
{
|
||||
dwarnln("Required FEATURE_INCOMPAT_META_BG");
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
if (m_superblock.feature_incompat & Ext2::Enum::FEATURE_INCOMPAT_RECOVER)
|
||||
{
|
||||
dwarnln("Required FEATURE_INCOMPAT_RECOVER");
|
||||
return BAN::Error::from_errno(ENOTSUP);
|
||||
}
|
||||
|
||||
#if EXT2_DEBUG_PRINT
|
||||
dprintln("EXT2");
|
||||
dprintln(" inodes {}", m_superblock.inodes_count);
|
||||
dprintln(" blocks {}", m_superblock.blocks_count);
|
||||
dprintln(" version {}.{}", m_superblock.rev_level, m_superblock.minor_rev_level);
|
||||
dprintln(" first data at {}", m_superblock.first_data_block);
|
||||
dprintln(" block size {}", 1024 << m_superblock.log_block_size);
|
||||
dprintln(" inode size {}", m_superblock.inode_size);
|
||||
#endif
|
||||
|
||||
{
|
||||
BAN::Vector<uint8_t> block_buffer;
|
||||
TRY(block_buffer.resize(block_size()));
|
||||
|
||||
if (superblock().rev_level == Ext2::Enum::GOOD_OLD_REV)
|
||||
{
|
||||
// In revision 0 all blockgroups contain superblock backup
|
||||
TRY(m_superblock_backups.reserve(number_of_block_groups - 1));
|
||||
for (uint32_t i = 1; i < number_of_block_groups; i++)
|
||||
MUST(block_buffer.push_back(i));
|
||||
}
|
||||
else
|
||||
{
|
||||
// In other revision superblock backups are on blocks 1 and powers of 3, 5 and 7
|
||||
TRY(m_superblock_backups.push_back(1));
|
||||
for (uint32_t i = 3; i < number_of_block_groups; i *= 3)
|
||||
TRY(m_superblock_backups.push_back(i));
|
||||
for (uint32_t i = 5; i < number_of_block_groups; i *= 5)
|
||||
TRY(m_superblock_backups.push_back(i));
|
||||
for (uint32_t i = 7; i < number_of_block_groups; i *= 7)
|
||||
TRY(m_superblock_backups.push_back(i));
|
||||
|
||||
// We don't really care if this succeeds or not
|
||||
(void)m_superblock_backups.shrink_to_fit();
|
||||
}
|
||||
|
||||
for (uint32_t bg : m_superblock_backups)
|
||||
{
|
||||
read_block(superblock().first_data_block + superblock().blocks_per_group * bg, block_buffer.span());
|
||||
Ext2::Superblock& superblock_backup = *(Ext2::Superblock*)block_buffer.data();
|
||||
if (superblock_backup.magic != Ext2::Enum::SUPER_MAGIC)
|
||||
derrorln("superblock backup at block {} is invalid ({4H})", bg, superblock_backup.magic);
|
||||
}
|
||||
}
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
BAN::ErrorOr<void> Ext2FS::initialize_root_inode()
|
||||
{
|
||||
m_root_inode = TRY(Ext2Inode::create(*this, Ext2::Enum::ROOT_INO));
|
||||
|
||||
//(void)locate_inode(2271);
|
||||
|
||||
#if EXT2_DEBUG_PRINT
|
||||
dprintln("root inode:");
|
||||
dprintln(" created {}", root_inode()->ctime().tv_sec);
|
||||
dprintln(" modified {}", root_inode()->mtime().tv_sec);
|
||||
dprintln(" accessed {}", root_inode()->atime().tv_sec);
|
||||
#endif
|
||||
return {};
|
||||
}
|
||||
|
||||
BAN::ErrorOr<uint32_t> Ext2FS::create_inode(const Ext2::Inode& ext2_inode)
|
||||
{
|
||||
ASSERT(ext2_inode.size == 0);
|
||||
|
||||
if (m_superblock.free_inodes_count == 0)
|
||||
return BAN::Error::from_errno(ENOSPC);
|
||||
|
||||
const uint32_t block_size = this->block_size();
|
||||
|
||||
BAN::Vector<uint8_t> bgd_buffer;
|
||||
TRY(bgd_buffer.resize(block_size));
|
||||
|
||||
BAN::Vector<uint8_t> inode_bitmap;
|
||||
TRY(inode_bitmap.resize(block_size));
|
||||
|
||||
uint32_t current_group = -1;
|
||||
BlockLocation bgd_location {};
|
||||
Ext2::BlockGroupDescriptor* bgd = nullptr;
|
||||
|
||||
for (uint32_t ino = superblock().first_ino; ino <= superblock().inodes_count; ino++)
|
||||
{
|
||||
const uint32_t ino_group = (ino - 1) / superblock().inodes_per_group;
|
||||
const uint32_t ino_index = (ino - 1) % superblock().inodes_per_group;
|
||||
|
||||
if (ino_group != current_group)
|
||||
{
|
||||
current_group = ino_group;
|
||||
|
||||
bgd_location = locate_block_group_descriptior(current_group);
|
||||
read_block(bgd_location.block, bgd_buffer.span());
|
||||
|
||||
bgd = (Ext2::BlockGroupDescriptor*)(bgd_buffer.data() + bgd_location.offset);
|
||||
if (bgd->free_inodes_count == 0)
|
||||
{
|
||||
ino = (current_group + 1) * superblock().inodes_per_group;
|
||||
continue;
|
||||
}
|
||||
|
||||
read_block(bgd->inode_bitmap, inode_bitmap.span());
|
||||
}
|
||||
|
||||
const uint32_t ino_bitmap_byte = ino_index / 8;
|
||||
const uint32_t ino_bitmap_bit = ino_index % 8;
|
||||
if (inode_bitmap[ino_bitmap_byte] & (1 << ino_bitmap_bit))
|
||||
continue;
|
||||
|
||||
inode_bitmap[ino_bitmap_byte] |= 1 << ino_bitmap_bit;
|
||||
write_block(bgd->inode_bitmap, inode_bitmap.span());
|
||||
|
||||
bgd->free_inodes_count--;
|
||||
write_block(bgd_location.block, bgd_buffer.span());
|
||||
|
||||
const uint32_t inode_table_offset = ino_index * superblock().inode_size;
|
||||
const BlockLocation inode_location
|
||||
{
|
||||
.block = inode_table_offset / block_size + bgd->inode_table,
|
||||
.offset = inode_table_offset % block_size
|
||||
};
|
||||
|
||||
// NOTE: we don't need inode bitmap anymore, so we can reuse it
|
||||
auto& inode_buffer = inode_bitmap;
|
||||
|
||||
read_block(inode_location.block, inode_buffer.span());
|
||||
memcpy(inode_buffer.data() + inode_location.offset, &ext2_inode, sizeof(Ext2::Inode));
|
||||
if (superblock().inode_size > sizeof(Ext2::Inode))
|
||||
memset(inode_buffer.data() + inode_location.offset + sizeof(Ext2::Inode), 0, superblock().inode_size - sizeof(Ext2::Inode));
|
||||
write_block(inode_location.block, inode_buffer.span());
|
||||
|
||||
m_superblock.free_inodes_count--;
|
||||
sync_superblock();
|
||||
|
||||
return ino;
|
||||
}
|
||||
|
||||
derrorln("Corrupted file system. Superblock indicates free inodes but none were found.");
|
||||
return BAN::Error::from_error_code(ErrorCode::Ext2_Corrupted);
|
||||
}
|
||||
|
||||
void Ext2FS::read_block(uint32_t block, BAN::Span<uint8_t> buffer)
|
||||
{
|
||||
const uint32_t sector_size = m_partition.device().sector_size();
|
||||
const uint32_t block_size = this->block_size();
|
||||
const uint32_t sectors_per_block = block_size / sector_size;
|
||||
const uint32_t sectors_before = 2048 / sector_size;
|
||||
|
||||
ASSERT(block >= 2);
|
||||
ASSERT(buffer.size() >= block_size);
|
||||
MUST(m_partition.read_sectors(sectors_before + (block - 2) * sectors_per_block, sectors_per_block, buffer.data()));
|
||||
}
|
||||
|
||||
void Ext2FS::write_block(uint32_t block, BAN::Span<const uint8_t> buffer)
|
||||
{
|
||||
const uint32_t sector_size = m_partition.device().sector_size();
|
||||
const uint32_t block_size = this->block_size();
|
||||
const uint32_t sectors_per_block = block_size / sector_size;
|
||||
const uint32_t sectors_before = 2048 / sector_size;
|
||||
|
||||
ASSERT(block >= 2);
|
||||
ASSERT(buffer.size() >= block_size);
|
||||
MUST(m_partition.write_sectors(sectors_before + (block - 2) * sectors_per_block, sectors_per_block, buffer.data()));
|
||||
}
|
||||
|
||||
void Ext2FS::sync_superblock()
|
||||
{
|
||||
const uint32_t sector_size = m_partition.device().sector_size();
|
||||
ASSERT(1024 % sector_size == 0);
|
||||
|
||||
const uint32_t superblock_bytes =
|
||||
(m_superblock.rev_level == Ext2::Enum::GOOD_OLD_REV)
|
||||
? offsetof(Ext2::Superblock, __extension_start)
|
||||
: sizeof(Ext2::Superblock);
|
||||
|
||||
const uint32_t lba = 1024 / sector_size;
|
||||
const uint32_t sector_count = BAN::Math::div_round_up<uint32_t>(superblock_bytes, sector_size);
|
||||
|
||||
BAN::Vector<uint8_t> superblock_buffer;
|
||||
MUST(superblock_buffer.resize(sector_count * sector_size));
|
||||
|
||||
MUST(m_partition.read_sectors(lba, sector_count, superblock_buffer.data()));
|
||||
if (memcmp(superblock_buffer.data(), &m_superblock, superblock_bytes))
|
||||
{
|
||||
memcpy(superblock_buffer.data(), &m_superblock, superblock_bytes);
|
||||
MUST(m_partition.write_sectors(lba, sector_count, superblock_buffer.data()));
|
||||
}
|
||||
}
|
||||
|
||||
BAN::ErrorOr<uint32_t> Ext2FS::reserve_free_block(uint32_t primary_bgd)
|
||||
{
|
||||
if (m_superblock.r_blocks_count >= m_superblock.free_blocks_count)
|
||||
return BAN::Error::from_errno(ENOSPC);
|
||||
|
||||
const uint32_t block_size = this->block_size();
|
||||
|
||||
BAN::Vector<uint8_t> bgd_buffer;
|
||||
TRY(bgd_buffer.resize(block_size));
|
||||
|
||||
BAN::Vector<uint8_t> block_bitmap;
|
||||
TRY(block_bitmap.resize(block_size));
|
||||
|
||||
auto check_block_group =
|
||||
[&](uint32_t block_group) -> uint32_t
|
||||
{
|
||||
auto bgd_location = locate_block_group_descriptior(block_group);
|
||||
read_block(bgd_location.block, bgd_buffer.span());
|
||||
|
||||
auto& bgd = *(Ext2::BlockGroupDescriptor*)(bgd_buffer.data() + bgd_location.offset);
|
||||
if (bgd.free_blocks_count == 0)
|
||||
return 0;
|
||||
|
||||
read_block(bgd.block_bitmap, block_bitmap.span());
|
||||
for (uint32_t block_offset = 0; block_offset < m_superblock.blocks_per_group; block_offset++)
|
||||
{
|
||||
uint32_t byte = block_offset / 8;
|
||||
uint32_t bit = block_offset % 8;
|
||||
if (block_bitmap[byte] & (1 << bit))
|
||||
continue;
|
||||
|
||||
block_bitmap[byte] |= 1 << bit;
|
||||
write_block(bgd.block_bitmap, block_bitmap.span());
|
||||
|
||||
bgd.free_blocks_count--;
|
||||
write_block(bgd_location.block, bgd_buffer.span());
|
||||
|
||||
m_superblock.free_blocks_count--;
|
||||
sync_superblock();
|
||||
|
||||
return m_superblock.first_data_block + m_superblock.blocks_per_group * block_group + block_offset;
|
||||
}
|
||||
|
||||
derrorln("Corrupted file system. Block group descriptor indicates free blocks but none were found");
|
||||
return 0;
|
||||
};
|
||||
|
||||
if (auto ret = check_block_group(primary_bgd))
|
||||
return ret;
|
||||
|
||||
uint32_t number_of_block_groups = BAN::Math::div_round_up(m_superblock.blocks_count, m_superblock.blocks_per_group);
|
||||
for (uint32_t block_group = 0; block_group < number_of_block_groups; block_group++)
|
||||
if (block_group != primary_bgd)
|
||||
if (auto ret = check_block_group(block_group))
|
||||
return ret;
|
||||
|
||||
derrorln("Corrupted file system. Superblock indicates free blocks but none were found.");
|
||||
return BAN::Error::from_error_code(ErrorCode::Ext2_Corrupted);
|
||||
}
|
||||
|
||||
BAN::ErrorOr<Ext2FS::BlockLocation> Ext2FS::locate_inode(uint32_t ino)
|
||||
{
|
||||
ASSERT(ino < superblock().inodes_count);
|
||||
|
||||
const uint32_t block_size = this->block_size();
|
||||
|
||||
BAN::Vector<uint8_t> bgd_buffer;
|
||||
TRY(bgd_buffer.resize(block_size));
|
||||
|
||||
const uint32_t inode_group = (ino - 1) / superblock().inodes_per_group;
|
||||
const uint32_t inode_index = (ino - 1) % superblock().inodes_per_group;
|
||||
|
||||
auto bgd_location = locate_block_group_descriptior(inode_group);
|
||||
|
||||
read_block(bgd_location.block, bgd_buffer.span());
|
||||
|
||||
auto& bgd = *(Ext2::BlockGroupDescriptor*)(bgd_buffer.data() + bgd_location.offset);
|
||||
|
||||
const uint32_t inode_byte_offset = inode_index * superblock().inode_size;
|
||||
BlockLocation location
|
||||
{
|
||||
.block = inode_byte_offset / block_size + bgd.inode_table,
|
||||
.offset = inode_byte_offset % block_size
|
||||
};
|
||||
|
||||
#if VERIFY_INODE_EXISTANCE
|
||||
const uint32_t inode_bitmap_block = bgd.inode_bitmap;
|
||||
|
||||
// NOTE: we can reuse the bgd_buffer since it is not needed anymore
|
||||
auto& inode_bitmap = bgd_buffer;
|
||||
|
||||
read_block(inode_bitmap_block, inode_bitmap.span());
|
||||
|
||||
const uint32_t byte = inode_index / 8;
|
||||
const uint32_t bit = inode_index % 8;
|
||||
ASSERT(inode_bitmap[byte] & (1 << bit));
|
||||
#endif
|
||||
|
||||
return location;
|
||||
}
|
||||
|
||||
Ext2FS::BlockLocation Ext2FS::locate_block_group_descriptior(uint32_t group_index)
|
||||
{
|
||||
const uint32_t block_size = this->block_size();
|
||||
|
||||
const uint32_t block_group_count = BAN::Math::div_round_up(superblock().inodes_count, superblock().inodes_per_group);
|
||||
ASSERT(group_index < block_group_count);
|
||||
|
||||
// Block Group Descriptor table is always after the superblock
|
||||
// Superblock begins at byte 1024 and is exactly 1024 bytes wide
|
||||
const uint32_t bgd_byte_offset = 2048 + sizeof(Ext2::BlockGroupDescriptor) * group_index;
|
||||
|
||||
return
|
||||
{
|
||||
.block = bgd_byte_offset / block_size,
|
||||
.offset = bgd_byte_offset % block_size
|
||||
};
|
||||
}
|
||||
|
||||
}
|
||||
@@ -1,7 +1,7 @@
|
||||
#include <BAN/ScopeGuard.h>
|
||||
#include <BAN/StringView.h>
|
||||
#include <kernel/FS/DevFS/FileSystem.h>
|
||||
#include <kernel/FS/Ext2.h>
|
||||
#include <kernel/FS/Ext2/FileSystem.h>
|
||||
#include <kernel/FS/RamFS/FileSystem.h>
|
||||
#include <kernel/FS/RamFS/Inode.h>
|
||||
#include <kernel/FS/VirtualFileSystem.h>
|
||||
|
||||
@@ -2,7 +2,6 @@
|
||||
#include <BAN/ScopeGuard.h>
|
||||
#include <BAN/StringView.h>
|
||||
#include <BAN/UTF8.h>
|
||||
#include <kernel/FS/Ext2.h>
|
||||
#include <kernel/FS/VirtualFileSystem.h>
|
||||
#include <kernel/PCI.h>
|
||||
#include <kernel/Storage/StorageDevice.h>
|
||||
|
||||
Reference in New Issue
Block a user