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Kernel: Split the Ext2FileSystem.{cpp,h} files into smaller components

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Liav A 2022-10-24 10:02:37 +03:00 committed by Andrew Kaster
parent 1c91881a1d
commit 3cc0d60141
Notes: sideshowbarker 2024-07-17 04:40:46 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/3cc0d60141
Pull-request: https://github.com/SerenityOS/serenity/pull/15771
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/bgianfo
15 changed files with 845 additions and 802 deletions
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1
Kernel/Arch/x86/init.cpp
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@ -29,7 +29,6 @@
#include <Kernel/Devices/SelfTTYDevice.h>
#include <Kernel/Devices/SerialDevice.h>
#include <Kernel/Devices/ZeroDevice.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/FileSystem/SysFS/Registry.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Firmware/Directory.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>

3
Kernel/CMakeLists.txt
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@ -111,7 +111,8 @@ set(KERNEL_SOURCES
FileSystem/Custody.cpp
FileSystem/DevPtsFS/FileSystem.cpp
FileSystem/DevPtsFS/Inode.cpp
FileSystem/Ext2FileSystem.cpp
FileSystem/Ext2FS/FileSystem.cpp
FileSystem/Ext2FS/Inode.cpp
FileSystem/FATFS/FileSystem.cpp
FileSystem/FATFS/Inode.cpp
FileSystem/FIFO.cpp

36
Kernel/FileSystem/ext2_fs.h → Kernel/FileSystem/Ext2FS/Definitions.h
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@ -16,6 +16,8 @@
#ifndef _LINUX_EXT2_FS_H
#define _LINUX_EXT2_FS_H
static constexpr size_t max_block_size = 4096;
#include "ext2_types.h" /* Changed from linux/types.h */
/*
@ -510,18 +512,18 @@ struct ext2_super_block {
__u16 s_def_resuid; /* Default uid for reserved blocks */
__u16 s_def_resgid; /* Default gid for reserved blocks */
/*
* These fields are for EXT2_DYNAMIC_REV superblocks only.
*
* Note: the difference between the compatible feature set and
* the incompatible feature set is that if there is a bit set
* in the incompatible feature set that the kernel doesn't
* know about, it should refuse to mount the filesystem.
*
* e2fsck's requirements are more strict; if it doesn't know
* about a feature in either the compatible or incompatible
* feature set, it must abort and not try to meddle with
* things it doesn't understand...
*/
* These fields are for EXT2_DYNAMIC_REV superblocks only.
*
* Note: the difference between the compatible feature set and
* the incompatible feature set is that if there is a bit set
* in the incompatible feature set that the kernel doesn't
* know about, it should refuse to mount the filesystem.
*
* e2fsck's requirements are more strict; if it doesn't know
* about a feature in either the compatible or incompatible
* feature set, it must abort and not try to meddle with
* things it doesn't understand...
*/
__u32 s_first_ino; /* First non-reserved inode */
__u16 s_inode_size; /* size of inode structure */
__u16 s_block_group_nr; /* block group # of this superblock */
@ -533,15 +535,15 @@ struct ext2_super_block {
char s_last_mounted[64]; /* directory where last mounted */
__u32 s_algorithm_usage_bitmap; /* For compression */
/*
* Performance hints. Directory preallocation should only
* happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
*/
* Performance hints. Directory preallocation should only
* happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
*/
__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
__u16 s_reserved_gdt_blocks; /* Per group table for online growth */
/*
* Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
*/
* Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
*/
__u8 s_journal_uuid[16]; /* uuid of journal superblock */
__u32 s_journal_inum; /* inode number of journal file */
__u32 s_journal_dev; /* device number of journal file */

23
Kernel/FileSystem/Ext2FS/DirectoryEntry.h Normal file
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@ -0,0 +1,23 @@
/*
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/KString.h>
namespace Kernel {
struct Ext2FSDirectoryEntry {
NonnullOwnPtr<KString> name;
InodeIndex inode_index { 0 };
u8 file_type { 0 };
u16 record_length { 0 };
};
}

697
Kernel/FileSystem/Ext2FS/FileSystem.cpp Normal file
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@ -0,0 +1,697 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/Ext2FS/FileSystem.h>
#include <Kernel/FileSystem/Ext2FS/Inode.h>
#include <Kernel/Process.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
ErrorOr<NonnullLockRefPtr<FileSystem>> Ext2FS::try_create(OpenFileDescription& file_description)
{
return TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Ext2FS(file_description)));
}
Ext2FS::Ext2FS(OpenFileDescription& file_description)
: BlockBasedFileSystem(file_description)
{
}
Ext2FS::~Ext2FS() = default;
ErrorOr<void> Ext2FS::flush_super_block()
{
MutexLocker locker(m_lock);
VERIFY((sizeof(ext2_super_block) % logical_block_size()) == 0);
auto super_block_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&m_super_block);
return raw_write_blocks(2, (sizeof(ext2_super_block) / logical_block_size()), super_block_buffer);
}
ext2_group_desc const& Ext2FS::group_descriptor(GroupIndex group_index) const
{
// FIXME: Should this fail gracefully somehow?
VERIFY(group_index <= m_block_group_count);
VERIFY(group_index > 0);
return block_group_descriptors()[group_index.value() - 1];
}
bool Ext2FS::is_initialized_while_locked()
{
VERIFY(m_lock.is_locked());
return !m_root_inode.is_null();
}
ErrorOr<void> Ext2FS::initialize_while_locked()
{
VERIFY(m_lock.is_locked());
VERIFY(!is_initialized_while_locked());
VERIFY((sizeof(ext2_super_block) % logical_block_size()) == 0);
auto super_block_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&m_super_block);
TRY(raw_read_blocks(2, (sizeof(ext2_super_block) / logical_block_size()), super_block_buffer));
auto const& super_block = this->super_block();
if constexpr (EXT2_DEBUG) {
dmesgln("Ext2FS: super block magic: {:04x} (super block size: {})", super_block.s_magic, sizeof(ext2_super_block));
}
if (super_block.s_magic != EXT2_SUPER_MAGIC) {
dmesgln("Ext2FS: Bad super block magic");
return EINVAL;
}
if constexpr (EXT2_DEBUG) {
dmesgln("Ext2FS: {} inodes, {} blocks", super_block.s_inodes_count, super_block.s_blocks_count);
dmesgln("Ext2FS: Block size: {}", EXT2_BLOCK_SIZE(&super_block));
dmesgln("Ext2FS: First data block: {}", super_block.s_first_data_block);
dmesgln("Ext2FS: Inodes per block: {}", inodes_per_block());
dmesgln("Ext2FS: Inodes per group: {}", inodes_per_group());
dmesgln("Ext2FS: Free inodes: {}", super_block.s_free_inodes_count);
dmesgln("Ext2FS: Descriptors per block: {}", EXT2_DESC_PER_BLOCK(&super_block));
dmesgln("Ext2FS: Descriptor size: {}", EXT2_DESC_SIZE(&super_block));
}
set_block_size(EXT2_BLOCK_SIZE(&super_block));
set_fragment_size(EXT2_FRAG_SIZE(&super_block));
// Note: This depends on the block size being available.
TRY(BlockBasedFileSystem::initialize_while_locked());
VERIFY(block_size() <= (int)max_block_size);
m_block_group_count = ceil_div(super_block.s_blocks_count, super_block.s_blocks_per_group);
if (m_block_group_count == 0) {
dmesgln("Ext2FS: no block groups :(");
return EINVAL;
}
auto blocks_to_read = ceil_div(m_block_group_count * sizeof(ext2_group_desc), block_size());
BlockIndex first_block_of_bgdt = block_size() == 1024 ? 2 : 1;
m_cached_group_descriptor_table = TRY(KBuffer::try_create_with_size("Ext2FS: Block group descriptors"sv, block_size() * blocks_to_read, Memory::Region::Access::ReadWrite));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_group_descriptor_table->data());
TRY(read_blocks(first_block_of_bgdt, blocks_to_read, buffer));
if constexpr (EXT2_DEBUG) {
for (unsigned i = 1; i <= m_block_group_count; ++i) {
auto const& group = group_descriptor(i);
dbgln("Ext2FS: group[{}] ( block_bitmap: {}, inode_bitmap: {}, inode_table: {} )", i, group.bg_block_bitmap, group.bg_inode_bitmap, group.bg_inode_table);
}
}
m_root_inode = TRY(build_root_inode());
return {};
}
Inode& Ext2FS::root_inode()
{
return *m_root_inode;
}
bool Ext2FS::find_block_containing_inode(InodeIndex inode, BlockIndex& block_index, unsigned& offset) const
{
auto const& super_block = this->super_block();
if (inode != EXT2_ROOT_INO && inode < EXT2_FIRST_INO(&super_block))
return false;
if (inode > super_block.s_inodes_count)
return false;
auto const& bgd = group_descriptor(group_index_from_inode(inode));
u64 full_offset = ((inode.value() - 1) % inodes_per_group()) * inode_size();
block_index = bgd.bg_inode_table + (full_offset >> EXT2_BLOCK_SIZE_BITS(&super_block));
offset = full_offset & (block_size() - 1);
return true;
}
Ext2FS::BlockListShape Ext2FS::compute_block_list_shape(unsigned blocks) const
{
BlockListShape shape;
unsigned const entries_per_block = EXT2_ADDR_PER_BLOCK(&super_block());
unsigned blocks_remaining = blocks;
shape.direct_blocks = min((unsigned)EXT2_NDIR_BLOCKS, blocks_remaining);
blocks_remaining -= shape.direct_blocks;
if (!blocks_remaining)
return shape;
shape.indirect_blocks = min(blocks_remaining, entries_per_block);
shape.meta_blocks += 1;
blocks_remaining -= shape.indirect_blocks;
if (!blocks_remaining)
return shape;
shape.doubly_indirect_blocks = min(blocks_remaining, entries_per_block * entries_per_block);
shape.meta_blocks += 1;
shape.meta_blocks += ceil_div(shape.doubly_indirect_blocks, entries_per_block);
blocks_remaining -= shape.doubly_indirect_blocks;
if (!blocks_remaining)
return shape;
shape.triply_indirect_blocks = min(blocks_remaining, entries_per_block * entries_per_block * entries_per_block);
shape.meta_blocks += 1;
shape.meta_blocks += ceil_div(shape.triply_indirect_blocks, entries_per_block * entries_per_block);
shape.meta_blocks += ceil_div(shape.triply_indirect_blocks, entries_per_block);
blocks_remaining -= shape.triply_indirect_blocks;
VERIFY(blocks_remaining == 0);
return shape;
}
u8 Ext2FS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
{
switch (entry.file_type) {
case EXT2_FT_REG_FILE:
return DT_REG;
case EXT2_FT_DIR:
return DT_DIR;
case EXT2_FT_CHRDEV:
return DT_CHR;
case EXT2_FT_BLKDEV:
return DT_BLK;
case EXT2_FT_FIFO:
return DT_FIFO;
case EXT2_FT_SOCK:
return DT_SOCK;
case EXT2_FT_SYMLINK:
return DT_LNK;
default:
return DT_UNKNOWN;
}
}
Ext2FS::FeaturesReadOnly Ext2FS::get_features_readonly() const
{
if (m_super_block.s_rev_level > 0)
return static_cast<Ext2FS::FeaturesReadOnly>(m_super_block.s_feature_ro_compat);
return Ext2FS::FeaturesReadOnly::None;
}
u64 Ext2FS::inodes_per_block() const
{
return EXT2_INODES_PER_BLOCK(&super_block());
}
u64 Ext2FS::inodes_per_group() const
{
return EXT2_INODES_PER_GROUP(&super_block());
}
u64 Ext2FS::inode_size() const
{
return EXT2_INODE_SIZE(&super_block());
}
u64 Ext2FS::blocks_per_group() const
{
return EXT2_BLOCKS_PER_GROUP(&super_block());
}
ErrorOr<void> Ext2FS::write_ext2_inode(InodeIndex inode, ext2_inode const& e2inode)
{
BlockIndex block_index;
unsigned offset;
if (!find_block_containing_inode(inode, block_index, offset))
return EINVAL;
auto buffer = UserOrKernelBuffer::for_kernel_buffer(const_cast<u8*>((u8 const*)&e2inode));
return write_block(block_index, buffer, inode_size(), offset);
}
auto Ext2FS::allocate_blocks(GroupIndex preferred_group_index, size_t count) -> ErrorOr<Vector<BlockIndex>>
{
dbgln_if(EXT2_DEBUG, "Ext2FS: allocate_blocks(preferred group: {}, count {})", preferred_group_index, count);
if (count == 0)
return Vector<BlockIndex> {};
Vector<BlockIndex> blocks;
TRY(blocks.try_ensure_capacity(count));
MutexLocker locker(m_lock);
auto group_index = preferred_group_index;
if (!group_descriptor(preferred_group_index).bg_free_blocks_count) {
group_index = 1;
}
while (blocks.size() < count) {
bool found_a_group = false;
if (group_descriptor(group_index).bg_free_blocks_count) {
found_a_group = true;
} else {
if (group_index == preferred_group_index)
group_index = 1;
for (; group_index <= m_block_group_count; group_index = GroupIndex { group_index.value() + 1 }) {
if (group_descriptor(group_index).bg_free_blocks_count) {
found_a_group = true;
break;
}
}
}
VERIFY(found_a_group);
auto const& bgd = group_descriptor(group_index);
auto* cached_bitmap = TRY(get_bitmap_block(bgd.bg_block_bitmap));
int blocks_in_group = min(blocks_per_group(), super_block().s_blocks_count);
auto block_bitmap = cached_bitmap->bitmap(blocks_in_group);
BlockIndex first_block_in_group = (group_index.value() - 1) * blocks_per_group() + first_block_index().value();
size_t free_region_size = 0;
auto first_unset_bit_index = block_bitmap.find_longest_range_of_unset_bits(count - blocks.size(), free_region_size);
VERIFY(first_unset_bit_index.has_value());
dbgln_if(EXT2_DEBUG, "Ext2FS: allocating free region of size: {} [{}]", free_region_size, group_index);
for (size_t i = 0; i < free_region_size; ++i) {
BlockIndex block_index = (first_unset_bit_index.value() + i) + first_block_in_group.value();
TRY(set_block_allocation_state(block_index, true));
blocks.unchecked_append(block_index);
dbgln_if(EXT2_DEBUG, " allocated > {}", block_index);
}
}
VERIFY(blocks.size() == count);
return blocks;
}
ErrorOr<InodeIndex> Ext2FS::allocate_inode(GroupIndex preferred_group)
{
dbgln_if(EXT2_DEBUG, "Ext2FS: allocate_inode(preferred_group: {})", preferred_group);
MutexLocker locker(m_lock);
// FIXME: We shouldn't refuse to allocate an inode if there is no group that can house the whole thing.
// In those cases we should just spread it across multiple groups.
auto is_suitable_group = [this](auto group_index) {
auto& bgd = group_descriptor(group_index);
return bgd.bg_free_inodes_count && bgd.bg_free_blocks_count >= 1;
};
GroupIndex group_index;
if (preferred_group.value() && is_suitable_group(preferred_group)) {
group_index = preferred_group;
} else {
for (unsigned i = 1; i <= m_block_group_count; ++i) {
if (is_suitable_group(i)) {
group_index = i;
break;
}
}
}
if (!group_index) {
dmesgln("Ext2FS: allocate_inode: no suitable group found for new inode");
return ENOSPC;
}
dbgln_if(EXT2_DEBUG, "Ext2FS: allocate_inode: found suitable group [{}] for new inode :^)", group_index);
auto const& bgd = group_descriptor(group_index);
unsigned inodes_in_group = min(inodes_per_group(), super_block().s_inodes_count);
InodeIndex first_inode_in_group = (group_index.value() - 1) * inodes_per_group() + 1;
auto* cached_bitmap = TRY(get_bitmap_block(bgd.bg_inode_bitmap));
auto inode_bitmap = cached_bitmap->bitmap(inodes_in_group);
for (size_t i = 0; i < inode_bitmap.size(); ++i) {
if (inode_bitmap.get(i))
continue;
inode_bitmap.set(i, true);
auto inode_index = InodeIndex(first_inode_in_group.value() + i);
cached_bitmap->dirty = true;
m_super_block.s_free_inodes_count--;
m_super_block_dirty = true;
const_cast<ext2_group_desc&>(bgd).bg_free_inodes_count--;
m_block_group_descriptors_dirty = true;
// In case the inode cache had this cached as "non-existent", uncache that info.
m_inode_cache.remove(inode_index.value());
return inode_index;
}
dmesgln("Ext2FS: allocate_inode found no available inode, despite bgd claiming there are inodes :(");
return EIO;
}
Ext2FS::GroupIndex Ext2FS::group_index_from_block_index(BlockIndex block_index) const
{
if (!block_index)
return 0;
return (block_index.value() - 1) / blocks_per_group() + 1;
}
auto Ext2FS::group_index_from_inode(InodeIndex inode) const -> GroupIndex
{
if (!inode)
return 0;
return (inode.value() - 1) / inodes_per_group() + 1;
}
ErrorOr<bool> Ext2FS::get_inode_allocation_state(InodeIndex index) const
{
MutexLocker locker(m_lock);
if (index == 0)
return EINVAL;
auto group_index = group_index_from_inode(index);
auto const& bgd = group_descriptor(group_index);
unsigned index_in_group = index.value() - ((group_index.value() - 1) * inodes_per_group());
unsigned bit_index = (index_in_group - 1) % inodes_per_group();
auto* cached_bitmap = TRY(const_cast<Ext2FS&>(*this).get_bitmap_block(bgd.bg_inode_bitmap));
return cached_bitmap->bitmap(inodes_per_group()).get(bit_index);
}
ErrorOr<void> Ext2FS::update_bitmap_block(BlockIndex bitmap_block, size_t bit_index, bool new_state, u32& super_block_counter, u16& group_descriptor_counter)
{
auto* cached_bitmap = TRY(get_bitmap_block(bitmap_block));
bool current_state = cached_bitmap->bitmap(blocks_per_group()).get(bit_index);
if (current_state == new_state) {
dbgln("Ext2FS: Bit {} in bitmap block {} had unexpected state {}", bit_index, bitmap_block, current_state);
return EIO;
}
cached_bitmap->bitmap(blocks_per_group()).set(bit_index, new_state);
cached_bitmap->dirty = true;
if (new_state) {
--super_block_counter;
--group_descriptor_counter;
} else {
++super_block_counter;
++group_descriptor_counter;
}
m_super_block_dirty = true;
m_block_group_descriptors_dirty = true;
return {};
}
ErrorOr<void> Ext2FS::set_inode_allocation_state(InodeIndex inode_index, bool new_state)
{
MutexLocker locker(m_lock);
auto group_index = group_index_from_inode(inode_index);
unsigned index_in_group = inode_index.value() - ((group_index.value() - 1) * inodes_per_group());
unsigned bit_index = (index_in_group - 1) % inodes_per_group();
dbgln_if(EXT2_DEBUG, "Ext2FS: set_inode_allocation_state: Inode {} -> {}", inode_index, new_state);
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index));
return update_bitmap_block(bgd.bg_inode_bitmap, bit_index, new_state, m_super_block.s_free_inodes_count, bgd.bg_free_inodes_count);
}
Ext2FS::BlockIndex Ext2FS::first_block_index() const
{
return block_size() == 1024 ? 1 : 0;
}
ErrorOr<Ext2FS::CachedBitmap*> Ext2FS::get_bitmap_block(BlockIndex bitmap_block_index)
{
for (auto& cached_bitmap : m_cached_bitmaps) {
if (cached_bitmap->bitmap_block_index == bitmap_block_index)
return cached_bitmap.ptr();
}
auto block = TRY(KBuffer::try_create_with_size("Ext2FS: Cached bitmap block"sv, block_size(), Memory::Region::Access::ReadWrite));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(block->data());
TRY(read_block(bitmap_block_index, &buffer, block_size()));
auto new_bitmap = TRY(adopt_nonnull_own_or_enomem(new (nothrow) CachedBitmap(bitmap_block_index, move(block))));
TRY(m_cached_bitmaps.try_append(move(new_bitmap)));
return m_cached_bitmaps.last().ptr();
}
ErrorOr<void> Ext2FS::set_block_allocation_state(BlockIndex block_index, bool new_state)
{
VERIFY(block_index != 0);
MutexLocker locker(m_lock);
auto group_index = group_index_from_block_index(block_index);
unsigned index_in_group = (block_index.value() - first_block_index().value()) - ((group_index.value() - 1) * blocks_per_group());
unsigned bit_index = index_in_group % blocks_per_group();
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index));
dbgln_if(EXT2_DEBUG, "Ext2FS: Block {} state -> {} (in bitmap block {})", block_index, new_state, bgd.bg_block_bitmap);
return update_bitmap_block(bgd.bg_block_bitmap, bit_index, new_state, m_super_block.s_free_blocks_count, bgd.bg_free_blocks_count);
}
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FS::create_directory(Ext2FSInode& parent_inode, StringView name, mode_t mode, UserID uid, GroupID gid)
{
MutexLocker locker(m_lock);
VERIFY(is_directory(mode));
auto inode = TRY(create_inode(parent_inode, name, mode, 0, uid, gid));
dbgln_if(EXT2_DEBUG, "Ext2FS: create_directory: created new directory named '{} with inode {}", name, inode->index());
Vector<Ext2FSDirectoryEntry> entries;
auto current_directory_name = TRY(KString::try_create("."sv));
TRY(entries.try_empend(move(current_directory_name), inode->index(), static_cast<u8>(EXT2_FT_DIR)));
auto parent_directory_name = TRY(KString::try_create(".."sv));
TRY(entries.try_empend(move(parent_directory_name), parent_inode.index(), static_cast<u8>(EXT2_FT_DIR)));
TRY(static_cast<Ext2FSInode&>(*inode).write_directory(entries));
TRY(parent_inode.increment_link_count());
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index_from_inode(inode->identifier().index())));
++bgd.bg_used_dirs_count;
m_block_group_descriptors_dirty = true;
return inode;
}
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FS::create_inode(Ext2FSInode& parent_inode, StringView name, mode_t mode, dev_t dev, UserID uid, GroupID gid)
{
if (name.length() > EXT2_NAME_LEN)
return ENAMETOOLONG;
if (parent_inode.m_raw_inode.i_links_count == 0)
return ENOENT;
ext2_inode e2inode {};
auto now = kgettimeofday().to_truncated_seconds();
e2inode.i_mode = mode;
e2inode.i_uid = uid.value();
e2inode.i_gid = gid.value();
e2inode.i_size = 0;
e2inode.i_atime = now;
e2inode.i_ctime = now;
e2inode.i_mtime = now;
e2inode.i_dtime = 0;
e2inode.i_flags = 0;
// For directories, add +1 link count for the "." entry in self.
e2inode.i_links_count = is_directory(mode);
if (is_character_device(mode))
e2inode.i_block[0] = dev;
else if (is_block_device(mode))
e2inode.i_block[1] = dev;
auto inode_id = TRY(allocate_inode());
dbgln_if(EXT2_DEBUG, "Ext2FS: writing initial metadata for inode {}", inode_id.value());
TRY(write_ext2_inode(inode_id, e2inode));
auto new_inode = TRY(get_inode({ fsid(), inode_id }));
dbgln_if(EXT2_DEBUG, "Ext2FS: Adding inode '{}' (mode {:o}) to parent directory {}", name, mode, parent_inode.index());
TRY(parent_inode.add_child(*new_inode, name, mode));
return new_inode;
}
void Ext2FS::uncache_inode(InodeIndex index)
{
MutexLocker locker(m_lock);
m_inode_cache.remove(index);
}
unsigned Ext2FS::total_block_count() const
{
MutexLocker locker(m_lock);
return super_block().s_blocks_count;
}
unsigned Ext2FS::free_block_count() const
{
MutexLocker locker(m_lock);
return super_block().s_free_blocks_count;
}
unsigned Ext2FS::total_inode_count() const
{
MutexLocker locker(m_lock);
return super_block().s_inodes_count;
}
unsigned Ext2FS::free_inode_count() const
{
MutexLocker locker(m_lock);
return super_block().s_free_inodes_count;
}
ErrorOr<void> Ext2FS::prepare_to_clear_last_mount()
{
MutexLocker locker(m_lock);
for (auto& it : m_inode_cache) {
if (it.value->ref_count() > 1)
return EBUSY;
}
BlockBasedFileSystem::remove_disk_cache_before_last_unmount();
m_inode_cache.clear();
m_root_inode = nullptr;
return {};
}
ErrorOr<void> Ext2FS::free_inode(Ext2FSInode& inode)
{
MutexLocker locker(m_lock);
VERIFY(inode.m_raw_inode.i_links_count == 0);
dbgln_if(EXT2_DEBUG, "Ext2FS[{}]::free_inode(): Inode {} has no more links, time to delete!", fsid(), inode.index());
// Mark all blocks used by this inode as free.
{
auto blocks = TRY(inode.compute_block_list_with_meta_blocks());
for (auto block_index : blocks) {
VERIFY(block_index <= super_block().s_blocks_count);
if (block_index.value())
TRY(set_block_allocation_state(block_index, false));
}
}
// If the inode being freed is a directory, update block group directory counter.
if (inode.is_directory()) {
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index_from_inode(inode.index())));
--bgd.bg_used_dirs_count;
dbgln_if(EXT2_DEBUG, "Ext2FS[{}]::free_inode(): Decremented bg_used_dirs_count to {} for inode {}", fsid(), bgd.bg_used_dirs_count, inode.index());
m_block_group_descriptors_dirty = true;
}
// NOTE: After this point, the inode metadata is wiped.
memset(&inode.m_raw_inode, 0, sizeof(ext2_inode));
inode.m_raw_inode.i_dtime = kgettimeofday().to_truncated_seconds();
TRY(write_ext2_inode(inode.index(), inode.m_raw_inode));
// Mark the inode as free.
TRY(set_inode_allocation_state(inode.index(), false));
return {};
}
void Ext2FS::flush_block_group_descriptor_table()
{
MutexLocker locker(m_lock);
auto blocks_to_write = ceil_div(m_block_group_count * sizeof(ext2_group_desc), block_size());
auto first_block_of_bgdt = block_size() == 1024 ? 2 : 1;
auto buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)block_group_descriptors());
if (auto result = write_blocks(first_block_of_bgdt, blocks_to_write, buffer); result.is_error())
dbgln("Ext2FS[{}]::flush_block_group_descriptor_table(): Failed to write blocks: {}", fsid(), result.error());
}
void Ext2FS::flush_writes()
{
{
MutexLocker locker(m_lock);
if (m_super_block_dirty) {
auto result = flush_super_block();
if (result.is_error()) {
dbgln("Ext2FS[{}]::flush_writes(): Failed to write superblock: {}", fsid(), result.error());
// FIXME: We should handle this error.
VERIFY_NOT_REACHED();
}
m_super_block_dirty = false;
}
if (m_block_group_descriptors_dirty) {
flush_block_group_descriptor_table();
m_block_group_descriptors_dirty = false;
}
for (auto& cached_bitmap : m_cached_bitmaps) {
if (cached_bitmap->dirty) {
auto buffer = UserOrKernelBuffer::for_kernel_buffer(cached_bitmap->buffer->data());
if (auto result = write_block(cached_bitmap->bitmap_block_index, buffer, block_size()); result.is_error()) {
dbgln("Ext2FS[{}]::flush_writes(): Failed to write blocks: {}", fsid(), result.error());
}
cached_bitmap->dirty = false;
dbgln_if(EXT2_DEBUG, "Ext2FS[{}]::flush_writes(): Flushed bitmap block {}", fsid(), cached_bitmap->bitmap_block_index);
}
}
// Uncache Inodes that are only kept alive by the index-to-inode lookup cache.
// We don't uncache Inodes that are being watched by at least one InodeWatcher.
// FIXME: It would be better to keep a capped number of Inodes around.
// The problem is that they are quite heavy objects, and use a lot of heap memory
// for their (child name lookup) and (block list) caches.
m_inode_cache.remove_all_matching([](InodeIndex, LockRefPtr<Ext2FSInode> const& cached_inode) {
// NOTE: If we're asked to look up an inode by number (via get_inode) and it turns out
// to not exist, we remember the fact that it doesn't exist by caching a nullptr.
// This seems like a reasonable time to uncache ideas about unknown inodes, so do that.
if (cached_inode == nullptr)
return true;
return cached_inode->ref_count() == 1 && !cached_inode->has_watchers();
});
}
BlockBasedFileSystem::flush_writes();
}
ErrorOr<NonnullLockRefPtr<Ext2FSInode>> Ext2FS::build_root_inode() const
{
MutexLocker locker(m_lock);
BlockIndex block_index;
unsigned offset;
if (!find_block_containing_inode(EXT2_ROOT_INO, block_index, offset))
return EINVAL;
auto inode = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Ext2FSInode(const_cast<Ext2FS&>(*this), EXT2_ROOT_INO)));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(reinterpret_cast<u8*>(&inode->m_raw_inode));
TRY(read_block(block_index, &buffer, sizeof(ext2_inode), offset));
return inode;
}
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FS::get_inode(InodeIdentifier inode) const
{
MutexLocker locker(m_lock);
VERIFY(inode.fsid() == fsid());
VERIFY(m_root_inode);
if (inode.index() == EXT2_ROOT_INO)
return *m_root_inode;
{
auto it = m_inode_cache.find(inode.index());
if (it != m_inode_cache.end()) {
if (!it->value)
return ENOENT;
return NonnullLockRefPtr<Inode> { *it->value };
}
}
auto inode_allocation_state = TRY(get_inode_allocation_state(inode.index()));
if (!inode_allocation_state) {
TRY(m_inode_cache.try_set(inode.index(), nullptr));
return ENOENT;
}
BlockIndex block_index;
unsigned offset;
if (!find_block_containing_inode(inode.index(), block_index, offset))
return EINVAL;
auto new_inode = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Ext2FSInode(const_cast<Ext2FS&>(*this), inode.index())));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(reinterpret_cast<u8*>(&new_inode->m_raw_inode));
TRY(read_block(block_index, &buffer, sizeof(ext2_inode), offset));
TRY(m_inode_cache.try_set(inode.index(), new_inode));
return new_inode;
}
}

80
Kernel/FileSystem/Ext2FileSystem.h → Kernel/FileSystem/Ext2FS/FileSystem.h
View File

@ -9,75 +9,14 @@
#include <AK/Bitmap.h>
#include <AK/HashMap.h>
#include <Kernel/FileSystem/BlockBasedFileSystem.h>
#include <Kernel/FileSystem/Ext2FS/Definitions.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/ext2_fs.h>
#include <Kernel/KBuffer.h>
#include <Kernel/UnixTypes.h>
struct ext2_group_desc;
struct ext2_inode;
struct ext2_super_block;
namespace Kernel {
class Ext2FS;
struct Ext2FSDirectoryEntry;
class Ext2FSInode final : public Inode {
friend class Ext2FS;
public:
virtual ~Ext2FSInode() override;
u64 size() const;
bool is_symlink() const { return Kernel::is_symlink(m_raw_inode.i_mode); }
bool is_directory() const { return Kernel::is_directory(m_raw_inode.i_mode); }
private:
// ^Inode
virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullLockRefPtr<Inode>> lookup(StringView name) override;
virtual ErrorOr<void> flush_metadata() override;
virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& data, OpenFileDescription*) override;
virtual ErrorOr<NonnullLockRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual ErrorOr<void> add_child(Inode& child, StringView name, mode_t) override;
virtual ErrorOr<void> remove_child(StringView name) override;
virtual ErrorOr<void> update_timestamps(Optional<time_t> atime, Optional<time_t> ctime, Optional<time_t> mtime) override;
virtual ErrorOr<void> increment_link_count() override;
virtual ErrorOr<void> decrement_link_count() override;
virtual ErrorOr<void> chmod(mode_t) override;
virtual ErrorOr<void> chown(UserID, GroupID) override;
virtual ErrorOr<void> truncate(u64) override;
virtual ErrorOr<int> get_block_address(int) override;
ErrorOr<void> write_directory(Vector<Ext2FSDirectoryEntry>&);
ErrorOr<void> populate_lookup_cache();
ErrorOr<void> resize(u64);
ErrorOr<void> write_indirect_block(BlockBasedFileSystem::BlockIndex, Span<BlockBasedFileSystem::BlockIndex>);
ErrorOr<void> grow_doubly_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, Span<BlockBasedFileSystem::BlockIndex>, Vector<BlockBasedFileSystem::BlockIndex>&, unsigned&);
ErrorOr<void> shrink_doubly_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, size_t, unsigned&);
ErrorOr<void> grow_triply_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, Span<BlockBasedFileSystem::BlockIndex>, Vector<BlockBasedFileSystem::BlockIndex>&, unsigned&);
ErrorOr<void> shrink_triply_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, size_t, unsigned&);
ErrorOr<void> flush_block_list();
ErrorOr<void> compute_block_list_with_exclusive_locking();
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list() const;
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list_with_meta_blocks() const;
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list_impl(bool include_block_list_blocks) const;
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list_impl_internal(ext2_inode const&, bool include_block_list_blocks) const;
Ext2FS& fs();
Ext2FS const& fs() const;
Ext2FSInode(Ext2FS&, InodeIndex);
Vector<BlockBasedFileSystem::BlockIndex> m_block_list;
HashMap<NonnullOwnPtr<KString>, InodeIndex> m_lookup_cache;
ext2_inode m_raw_inode {};
Mutex m_block_list_lock { "BlockList"sv };
};
class Ext2FSInode;
class Ext2FS final : public BlockBasedFileSystem {
friend class Ext2FSInode;
@ -103,6 +42,9 @@ public:
FeaturesReadOnly get_features_readonly() const;
virtual StringView class_name() const override { return "Ext2FS"sv; }
virtual Inode& root_inode() override;
private:
AK_TYPEDEF_DISTINCT_ORDERED_ID(unsigned, GroupIndex);
@ -129,8 +71,6 @@ private:
virtual bool is_initialized_while_locked() override;
virtual ErrorOr<void> prepare_to_clear_last_mount() override;
virtual StringView class_name() const override { return "Ext2FS"sv; }
virtual Ext2FSInode& root_inode() override;
ErrorOr<NonnullLockRefPtr<Inode>> get_inode(InodeIdentifier) const;
ErrorOr<NonnullLockRefPtr<Inode>> create_inode(Ext2FSInode& parent_inode, StringView name, mode_t, dev_t, UserID, GroupID);
ErrorOr<NonnullLockRefPtr<Inode>> create_directory(Ext2FSInode& parent_inode, StringView name, mode_t, UserID, GroupID);
@ -188,14 +128,4 @@ private:
LockRefPtr<Ext2FSInode> m_root_inode;
};
inline Ext2FS& Ext2FSInode::fs()
{
return static_cast<Ext2FS&>(Inode::fs());
}
inline Ext2FS const& Ext2FSInode::fs() const
{
return static_cast<Ext2FS const&>(Inode::fs());
}
}

709
Kernel/FileSystem/Ext2FileSystem.cpp → Kernel/FileSystem/Ext2FS/Inode.cpp
View File

@ -5,31 +5,17 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/HashMap.h>
#include <AK/MemoryStream.h>
#include <AK/StdLibExtras.h>
#include <AK/StringView.h>
#include <Kernel/API/POSIX/errno.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/FileSystem/ext2_fs.h>
#include <Kernel/Process.h>
#include <Kernel/FileSystem/Ext2FS/Inode.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
static constexpr size_t max_block_size = 4096;
static constexpr size_t max_inline_symlink_length = 60;
struct Ext2FSDirectoryEntry {
NonnullOwnPtr<KString> name;
InodeIndex inode_index { 0 };
u8 file_type { 0 };
u16 record_length { 0 };
};
static u8 to_ext2_file_type(mode_t mode)
{
if (is_regular_file(mode))
@ -49,158 +35,6 @@ static u8 to_ext2_file_type(mode_t mode)
return EXT2_FT_UNKNOWN;
}
ErrorOr<NonnullLockRefPtr<FileSystem>> Ext2FS::try_create(OpenFileDescription& file_description)
{
return TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Ext2FS(file_description)));
}
Ext2FS::Ext2FS(OpenFileDescription& file_description)
: BlockBasedFileSystem(file_description)
{
}
Ext2FS::~Ext2FS() = default;
ErrorOr<void> Ext2FS::flush_super_block()
{
MutexLocker locker(m_lock);
VERIFY((sizeof(ext2_super_block) % logical_block_size()) == 0);
auto super_block_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&m_super_block);
return raw_write_blocks(2, (sizeof(ext2_super_block) / logical_block_size()), super_block_buffer);
}
ext2_group_desc const& Ext2FS::group_descriptor(GroupIndex group_index) const
{
// FIXME: Should this fail gracefully somehow?
VERIFY(group_index <= m_block_group_count);
VERIFY(group_index > 0);
return block_group_descriptors()[group_index.value() - 1];
}
bool Ext2FS::is_initialized_while_locked()
{
VERIFY(m_lock.is_locked());
return !m_root_inode.is_null();
}
ErrorOr<void> Ext2FS::initialize_while_locked()
{
VERIFY(m_lock.is_locked());
VERIFY(!is_initialized_while_locked());
VERIFY((sizeof(ext2_super_block) % logical_block_size()) == 0);
auto super_block_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&m_super_block);
TRY(raw_read_blocks(2, (sizeof(ext2_super_block) / logical_block_size()), super_block_buffer));
auto const& super_block = this->super_block();
if constexpr (EXT2_DEBUG) {
dmesgln("Ext2FS: super block magic: {:04x} (super block size: {})", super_block.s_magic, sizeof(ext2_super_block));
}
if (super_block.s_magic != EXT2_SUPER_MAGIC) {
dmesgln("Ext2FS: Bad super block magic");
return EINVAL;
}
if constexpr (EXT2_DEBUG) {
dmesgln("Ext2FS: {} inodes, {} blocks", super_block.s_inodes_count, super_block.s_blocks_count);
dmesgln("Ext2FS: Block size: {}", EXT2_BLOCK_SIZE(&super_block));
dmesgln("Ext2FS: First data block: {}", super_block.s_first_data_block);
dmesgln("Ext2FS: Inodes per block: {}", inodes_per_block());
dmesgln("Ext2FS: Inodes per group: {}", inodes_per_group());
dmesgln("Ext2FS: Free inodes: {}", super_block.s_free_inodes_count);
dmesgln("Ext2FS: Descriptors per block: {}", EXT2_DESC_PER_BLOCK(&super_block));
dmesgln("Ext2FS: Descriptor size: {}", EXT2_DESC_SIZE(&super_block));
}
set_block_size(EXT2_BLOCK_SIZE(&super_block));
set_fragment_size(EXT2_FRAG_SIZE(&super_block));
// Note: This depends on the block size being available.
TRY(BlockBasedFileSystem::initialize_while_locked());
VERIFY(block_size() <= (int)max_block_size);
m_block_group_count = ceil_div(super_block.s_blocks_count, super_block.s_blocks_per_group);
if (m_block_group_count == 0) {
dmesgln("Ext2FS: no block groups :(");
return EINVAL;
}
auto blocks_to_read = ceil_div(m_block_group_count * sizeof(ext2_group_desc), block_size());
BlockIndex first_block_of_bgdt = block_size() == 1024 ? 2 : 1;
m_cached_group_descriptor_table = TRY(KBuffer::try_create_with_size("Ext2FS: Block group descriptors"sv, block_size() * blocks_to_read, Memory::Region::Access::ReadWrite));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(m_cached_group_descriptor_table->data());
TRY(read_blocks(first_block_of_bgdt, blocks_to_read, buffer));
if constexpr (EXT2_DEBUG) {
for (unsigned i = 1; i <= m_block_group_count; ++i) {
auto const& group = group_descriptor(i);
dbgln("Ext2FS: group[{}] ( block_bitmap: {}, inode_bitmap: {}, inode_table: {} )", i, group.bg_block_bitmap, group.bg_inode_bitmap, group.bg_inode_table);
}
}
m_root_inode = TRY(build_root_inode());
return {};
}
Ext2FSInode& Ext2FS::root_inode()
{
return *m_root_inode;
}
bool Ext2FS::find_block_containing_inode(InodeIndex inode, BlockIndex& block_index, unsigned& offset) const
{
auto const& super_block = this->super_block();
if (inode != EXT2_ROOT_INO && inode < EXT2_FIRST_INO(&super_block))
return false;
if (inode > super_block.s_inodes_count)
return false;
auto const& bgd = group_descriptor(group_index_from_inode(inode));
u64 full_offset = ((inode.value() - 1) % inodes_per_group()) * inode_size();
block_index = bgd.bg_inode_table + (full_offset >> EXT2_BLOCK_SIZE_BITS(&super_block));
offset = full_offset & (block_size() - 1);
return true;
}
Ext2FS::BlockListShape Ext2FS::compute_block_list_shape(unsigned blocks) const
{
BlockListShape shape;
unsigned const entries_per_block = EXT2_ADDR_PER_BLOCK(&super_block());
unsigned blocks_remaining = blocks;
shape.direct_blocks = min((unsigned)EXT2_NDIR_BLOCKS, blocks_remaining);
blocks_remaining -= shape.direct_blocks;
if (!blocks_remaining)
return shape;
shape.indirect_blocks = min(blocks_remaining, entries_per_block);
shape.meta_blocks += 1;
blocks_remaining -= shape.indirect_blocks;
if (!blocks_remaining)
return shape;
shape.doubly_indirect_blocks = min(blocks_remaining, entries_per_block * entries_per_block);
shape.meta_blocks += 1;
shape.meta_blocks += ceil_div(shape.doubly_indirect_blocks, entries_per_block);
blocks_remaining -= shape.doubly_indirect_blocks;
if (!blocks_remaining)
return shape;
shape.triply_indirect_blocks = min(blocks_remaining, entries_per_block * entries_per_block * entries_per_block);
shape.meta_blocks += 1;
shape.meta_blocks += ceil_div(shape.triply_indirect_blocks, entries_per_block * entries_per_block);
shape.meta_blocks += ceil_div(shape.triply_indirect_blocks, entries_per_block);
blocks_remaining -= shape.triply_indirect_blocks;
VERIFY(blocks_remaining == 0);
return shape;
}
ErrorOr<void> Ext2FSInode::write_indirect_block(BlockBasedFileSystem::BlockIndex block, Span<BlockBasedFileSystem::BlockIndex> blocks_indices)
{
auto const entries_per_block = EXT2_ADDR_PER_BLOCK(&fs().super_block());
@ -530,7 +364,7 @@ ErrorOr<Vector<Ext2FS::BlockIndex>> Ext2FSInode::compute_block_list_impl_interna
// If the path is longer than 60 characters, a block is allocated, and the
// block contains the destination path. The file size corresponds to the
// path length of the destination.
if (::is_symlink(e2inode.i_mode) && e2inode.i_blocks == 0)
if (Kernel::is_symlink(e2inode.i_mode) && e2inode.i_blocks == 0)
block_count = 0;
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::block_list_for_inode(): i_size={}, i_blocks={}, block_count={}", identifier(), e2inode.i_size, e2inode.i_blocks, block_count);
@ -613,100 +447,6 @@ ErrorOr<Vector<Ext2FS::BlockIndex>> Ext2FSInode::compute_block_list_impl_interna
return list;
}
ErrorOr<void> Ext2FS::free_inode(Ext2FSInode& inode)
{
MutexLocker locker(m_lock);
VERIFY(inode.m_raw_inode.i_links_count == 0);
dbgln_if(EXT2_DEBUG, "Ext2FS[{}]::free_inode(): Inode {} has no more links, time to delete!", fsid(), inode.index());
// Mark all blocks used by this inode as free.
{
auto blocks = TRY(inode.compute_block_list_with_meta_blocks());
for (auto block_index : blocks) {
VERIFY(block_index <= super_block().s_blocks_count);
if (block_index.value())
TRY(set_block_allocation_state(block_index, false));
}
}
// If the inode being freed is a directory, update block group directory counter.
if (inode.is_directory()) {
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index_from_inode(inode.index())));
--bgd.bg_used_dirs_count;
dbgln_if(EXT2_DEBUG, "Ext2FS[{}]::free_inode(): Decremented bg_used_dirs_count to {} for inode {}", fsid(), bgd.bg_used_dirs_count, inode.index());
m_block_group_descriptors_dirty = true;
}
// NOTE: After this point, the inode metadata is wiped.
memset(&inode.m_raw_inode, 0, sizeof(ext2_inode));
inode.m_raw_inode.i_dtime = kgettimeofday().to_truncated_seconds();
TRY(write_ext2_inode(inode.index(), inode.m_raw_inode));
// Mark the inode as free.
TRY(set_inode_allocation_state(inode.index(), false));
return {};
}
void Ext2FS::flush_block_group_descriptor_table()
{
MutexLocker locker(m_lock);
auto blocks_to_write = ceil_div(m_block_group_count * sizeof(ext2_group_desc), block_size());
auto first_block_of_bgdt = block_size() == 1024 ? 2 : 1;
auto buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)block_group_descriptors());
if (auto result = write_blocks(first_block_of_bgdt, blocks_to_write, buffer); result.is_error())
dbgln("Ext2FS[{}]::flush_block_group_descriptor_table(): Failed to write blocks: {}", fsid(), result.error());
}
void Ext2FS::flush_writes()
{
{
MutexLocker locker(m_lock);
if (m_super_block_dirty) {
auto result = flush_super_block();
if (result.is_error()) {
dbgln("Ext2FS[{}]::flush_writes(): Failed to write superblock: {}", fsid(), result.error());
// FIXME: We should handle this error.
VERIFY_NOT_REACHED();
}
m_super_block_dirty = false;
}
if (m_block_group_descriptors_dirty) {
flush_block_group_descriptor_table();
m_block_group_descriptors_dirty = false;
}
for (auto& cached_bitmap : m_cached_bitmaps) {
if (cached_bitmap->dirty) {
auto buffer = UserOrKernelBuffer::for_kernel_buffer(cached_bitmap->buffer->data());
if (auto result = write_block(cached_bitmap->bitmap_block_index, buffer, block_size()); result.is_error()) {
dbgln("Ext2FS[{}]::flush_writes(): Failed to write blocks: {}", fsid(), result.error());
}
cached_bitmap->dirty = false;
dbgln_if(EXT2_DEBUG, "Ext2FS[{}]::flush_writes(): Flushed bitmap block {}", fsid(), cached_bitmap->bitmap_block_index);
}
}
// Uncache Inodes that are only kept alive by the index-to-inode lookup cache.
// We don't uncache Inodes that are being watched by at least one InodeWatcher.
// FIXME: It would be better to keep a capped number of Inodes around.
// The problem is that they are quite heavy objects, and use a lot of heap memory
// for their (child name lookup) and (block list) caches.
m_inode_cache.remove_all_matching([](InodeIndex, LockRefPtr<Ext2FSInode> const& cached_inode) {
// NOTE: If we're asked to look up an inode by number (via get_inode) and it turns out
// to not exist, we remember the fact that it doesn't exist by caching a nullptr.
// This seems like a reasonable time to uncache ideas about unknown inodes, so do that.
if (cached_inode == nullptr)
return true;
return cached_inode->ref_count() == 1 && !cached_inode->has_watchers();
});
}
BlockBasedFileSystem::flush_writes();
}
Ext2FSInode::Ext2FSInode(Ext2FS& fs, InodeIndex index)
: Inode(fs, index)
{
@ -770,60 +510,6 @@ ErrorOr<void> Ext2FSInode::flush_metadata()
return {};
}
ErrorOr<NonnullLockRefPtr<Ext2FSInode>> Ext2FS::build_root_inode() const
{
MutexLocker locker(m_lock);
BlockIndex block_index;
unsigned offset;
if (!find_block_containing_inode(EXT2_ROOT_INO, block_index, offset))
return EINVAL;
auto inode = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Ext2FSInode(const_cast<Ext2FS&>(*this), EXT2_ROOT_INO)));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(reinterpret_cast<u8*>(&inode->m_raw_inode));
TRY(read_block(block_index, &buffer, sizeof(ext2_inode), offset));
return inode;
}
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FS::get_inode(InodeIdentifier inode) const
{
MutexLocker locker(m_lock);
VERIFY(inode.fsid() == fsid());
VERIFY(m_root_inode);
if (inode.index() == EXT2_ROOT_INO)
return *m_root_inode;
{
auto it = m_inode_cache.find(inode.index());
if (it != m_inode_cache.end()) {
if (!it->value)
return ENOENT;
return NonnullLockRefPtr<Inode> { *it->value };
}
}
auto inode_allocation_state = TRY(get_inode_allocation_state(inode.index()));
if (!inode_allocation_state) {
TRY(m_inode_cache.try_set(inode.index(), nullptr));
return ENOENT;
}
BlockIndex block_index;
unsigned offset;
if (!find_block_containing_inode(inode.index(), block_index, offset))
return EINVAL;
auto new_inode = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) Ext2FSInode(const_cast<Ext2FS&>(*this), inode.index())));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(reinterpret_cast<u8*>(&new_inode->m_raw_inode));
TRY(read_block(block_index, &buffer, sizeof(ext2_inode), offset));
TRY(m_inode_cache.try_set(inode.index(), new_inode));
return new_inode;
}
ErrorOr<void> Ext2FSInode::compute_block_list_with_exclusive_locking()
{
// Note: We verify that the inode mutex is being held locked. Because only the read_bytes_locked()
@ -1043,35 +729,6 @@ ErrorOr<size_t> Ext2FSInode::write_bytes_locked(off_t offset, size_t count, User
return nwritten;
}
u8 Ext2FS::internal_file_type_to_directory_entry_type(DirectoryEntryView const& entry) const
{
switch (entry.file_type) {
case EXT2_FT_REG_FILE:
return DT_REG;
case EXT2_FT_DIR:
return DT_DIR;
case EXT2_FT_CHRDEV:
return DT_CHR;
case EXT2_FT_BLKDEV:
return DT_BLK;
case EXT2_FT_FIFO:
return DT_FIFO;
case EXT2_FT_SOCK:
return DT_SOCK;
case EXT2_FT_SYMLINK:
return DT_LNK;
default:
return DT_UNKNOWN;
}
}
Ext2FS::FeaturesReadOnly Ext2FS::get_features_readonly() const
{
if (m_super_block.s_rev_level > 0)
return static_cast<Ext2FS::FeaturesReadOnly>(m_super_block.s_feature_ro_compat);
return Ext2FS::FeaturesReadOnly::None;
}
ErrorOr<void> Ext2FSInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
{
VERIFY(is_directory());
@ -1088,14 +745,15 @@ ErrorOr<void> Ext2FSInode::traverse_as_directory(Function<ErrorOr<void>(FileSyst
for (u64 offset = 0; offset < file_size; offset += block_size) {
TRY(read_bytes(offset, block_size, buf, nullptr));
auto* entry = reinterpret_cast<ext2_dir_entry_2*>(buffer);
auto* entries_end = reinterpret_cast<ext2_dir_entry_2*>(buffer + block_size);
using ext2_extended_dir_entry = ext2_dir_entry_2;
auto* entry = reinterpret_cast<ext2_extended_dir_entry*>(buffer);
auto* entries_end = reinterpret_cast<ext2_extended_dir_entry*>(buffer + block_size);
while (entry < entries_end) {
if (entry->inode != 0) {
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::traverse_as_directory(): inode {}, name_len: {}, rec_len: {}, file_type: {}, name: {}", identifier(), entry->inode, entry->name_len, entry->rec_len, entry->file_type, StringView(entry->name, entry->name_len));
TRY(callback({ { entry->name, entry->name_len }, { fsid(), entry->inode }, entry->file_type }));
}
entry = (ext2_dir_entry_2*)((char*)entry + entry->rec_len);
entry = (ext2_extended_dir_entry*)((char*)entry + entry->rec_len);
}
}
@ -1161,7 +819,7 @@ ErrorOr<void> Ext2FSInode::write_directory(Vector<Ext2FSDirectoryEntry>& entries
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FSInode::create_child(StringView name, mode_t mode, dev_t dev, UserID uid, GroupID gid)
{
if (::is_directory(mode))
if (Kernel::is_directory(mode))
return fs().create_directory(*this, name, mode, uid, gid);
return fs().create_inode(*this, name, mode, dev, uid, gid);
}
@ -1234,314 +892,6 @@ ErrorOr<void> Ext2FSInode::remove_child(StringView name)
return {};
}
u64 Ext2FS::inodes_per_block() const
{
return EXT2_INODES_PER_BLOCK(&super_block());
}
u64 Ext2FS::inodes_per_group() const
{
return EXT2_INODES_PER_GROUP(&super_block());
}
u64 Ext2FS::inode_size() const
{
return EXT2_INODE_SIZE(&super_block());
}
u64 Ext2FS::blocks_per_group() const
{
return EXT2_BLOCKS_PER_GROUP(&super_block());
}
ErrorOr<void> Ext2FS::write_ext2_inode(InodeIndex inode, ext2_inode const& e2inode)
{
BlockIndex block_index;
unsigned offset;
if (!find_block_containing_inode(inode, block_index, offset))
return EINVAL;
auto buffer = UserOrKernelBuffer::for_kernel_buffer(const_cast<u8*>((u8 const*)&e2inode));
return write_block(block_index, buffer, inode_size(), offset);
}
auto Ext2FS::allocate_blocks(GroupIndex preferred_group_index, size_t count) -> ErrorOr<Vector<BlockIndex>>
{
dbgln_if(EXT2_DEBUG, "Ext2FS: allocate_blocks(preferred group: {}, count {})", preferred_group_index, count);
if (count == 0)
return Vector<BlockIndex> {};
Vector<BlockIndex> blocks;
TRY(blocks.try_ensure_capacity(count));
MutexLocker locker(m_lock);
auto group_index = preferred_group_index;
if (!group_descriptor(preferred_group_index).bg_free_blocks_count) {
group_index = 1;
}
while (blocks.size() < count) {
bool found_a_group = false;
if (group_descriptor(group_index).bg_free_blocks_count) {
found_a_group = true;
} else {
if (group_index == preferred_group_index)
group_index = 1;
for (; group_index <= m_block_group_count; group_index = GroupIndex { group_index.value() + 1 }) {
if (group_descriptor(group_index).bg_free_blocks_count) {
found_a_group = true;
break;
}
}
}
VERIFY(found_a_group);
auto const& bgd = group_descriptor(group_index);
auto* cached_bitmap = TRY(get_bitmap_block(bgd.bg_block_bitmap));
int blocks_in_group = min(blocks_per_group(), super_block().s_blocks_count);
auto block_bitmap = cached_bitmap->bitmap(blocks_in_group);
BlockIndex first_block_in_group = (group_index.value() - 1) * blocks_per_group() + first_block_index().value();
size_t free_region_size = 0;
auto first_unset_bit_index = block_bitmap.find_longest_range_of_unset_bits(count - blocks.size(), free_region_size);
VERIFY(first_unset_bit_index.has_value());
dbgln_if(EXT2_DEBUG, "Ext2FS: allocating free region of size: {} [{}]", free_region_size, group_index);
for (size_t i = 0; i < free_region_size; ++i) {
BlockIndex block_index = (first_unset_bit_index.value() + i) + first_block_in_group.value();
TRY(set_block_allocation_state(block_index, true));
blocks.unchecked_append(block_index);
dbgln_if(EXT2_DEBUG, " allocated > {}", block_index);
}
}
VERIFY(blocks.size() == count);
return blocks;
}
ErrorOr<InodeIndex> Ext2FS::allocate_inode(GroupIndex preferred_group)
{
dbgln_if(EXT2_DEBUG, "Ext2FS: allocate_inode(preferred_group: {})", preferred_group);
MutexLocker locker(m_lock);
// FIXME: We shouldn't refuse to allocate an inode if there is no group that can house the whole thing.
// In those cases we should just spread it across multiple groups.
auto is_suitable_group = [this](auto group_index) {
auto& bgd = group_descriptor(group_index);
return bgd.bg_free_inodes_count && bgd.bg_free_blocks_count >= 1;
};
GroupIndex group_index;
if (preferred_group.value() && is_suitable_group(preferred_group)) {
group_index = preferred_group;
} else {
for (unsigned i = 1; i <= m_block_group_count; ++i) {
if (is_suitable_group(i)) {
group_index = i;
break;
}
}
}
if (!group_index) {
dmesgln("Ext2FS: allocate_inode: no suitable group found for new inode");
return ENOSPC;
}
dbgln_if(EXT2_DEBUG, "Ext2FS: allocate_inode: found suitable group [{}] for new inode :^)", group_index);
auto const& bgd = group_descriptor(group_index);
unsigned inodes_in_group = min(inodes_per_group(), super_block().s_inodes_count);
InodeIndex first_inode_in_group = (group_index.value() - 1) * inodes_per_group() + 1;
auto* cached_bitmap = TRY(get_bitmap_block(bgd.bg_inode_bitmap));
auto inode_bitmap = cached_bitmap->bitmap(inodes_in_group);
for (size_t i = 0; i < inode_bitmap.size(); ++i) {
if (inode_bitmap.get(i))
continue;
inode_bitmap.set(i, true);
auto inode_index = InodeIndex(first_inode_in_group.value() + i);
cached_bitmap->dirty = true;
m_super_block.s_free_inodes_count--;
m_super_block_dirty = true;
const_cast<ext2_group_desc&>(bgd).bg_free_inodes_count--;
m_block_group_descriptors_dirty = true;
// In case the inode cache had this cached as "non-existent", uncache that info.
m_inode_cache.remove(inode_index.value());
return inode_index;
}
dmesgln("Ext2FS: allocate_inode found no available inode, despite bgd claiming there are inodes :(");
return EIO;
}
Ext2FS::GroupIndex Ext2FS::group_index_from_block_index(BlockIndex block_index) const
{
if (!block_index)
return 0;
return (block_index.value() - 1) / blocks_per_group() + 1;
}
auto Ext2FS::group_index_from_inode(InodeIndex inode) const -> GroupIndex
{
if (!inode)
return 0;
return (inode.value() - 1) / inodes_per_group() + 1;
}
ErrorOr<bool> Ext2FS::get_inode_allocation_state(InodeIndex index) const
{
MutexLocker locker(m_lock);
if (index == 0)
return EINVAL;
auto group_index = group_index_from_inode(index);
auto const& bgd = group_descriptor(group_index);
unsigned index_in_group = index.value() - ((group_index.value() - 1) * inodes_per_group());
unsigned bit_index = (index_in_group - 1) % inodes_per_group();
auto* cached_bitmap = TRY(const_cast<Ext2FS&>(*this).get_bitmap_block(bgd.bg_inode_bitmap));
return cached_bitmap->bitmap(inodes_per_group()).get(bit_index);
}
ErrorOr<void> Ext2FS::update_bitmap_block(BlockIndex bitmap_block, size_t bit_index, bool new_state, u32& super_block_counter, u16& group_descriptor_counter)
{
auto* cached_bitmap = TRY(get_bitmap_block(bitmap_block));
bool current_state = cached_bitmap->bitmap(blocks_per_group()).get(bit_index);
if (current_state == new_state) {
dbgln("Ext2FS: Bit {} in bitmap block {} had unexpected state {}", bit_index, bitmap_block, current_state);
return EIO;
}
cached_bitmap->bitmap(blocks_per_group()).set(bit_index, new_state);
cached_bitmap->dirty = true;
if (new_state) {
--super_block_counter;
--group_descriptor_counter;
} else {
++super_block_counter;
++group_descriptor_counter;
}
m_super_block_dirty = true;
m_block_group_descriptors_dirty = true;
return {};
}
ErrorOr<void> Ext2FS::set_inode_allocation_state(InodeIndex inode_index, bool new_state)
{
MutexLocker locker(m_lock);
auto group_index = group_index_from_inode(inode_index);
unsigned index_in_group = inode_index.value() - ((group_index.value() - 1) * inodes_per_group());
unsigned bit_index = (index_in_group - 1) % inodes_per_group();
dbgln_if(EXT2_DEBUG, "Ext2FS: set_inode_allocation_state: Inode {} -> {}", inode_index, new_state);
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index));
return update_bitmap_block(bgd.bg_inode_bitmap, bit_index, new_state, m_super_block.s_free_inodes_count, bgd.bg_free_inodes_count);
}
Ext2FS::BlockIndex Ext2FS::first_block_index() const
{
return block_size() == 1024 ? 1 : 0;
}
ErrorOr<Ext2FS::CachedBitmap*> Ext2FS::get_bitmap_block(BlockIndex bitmap_block_index)
{
for (auto& cached_bitmap : m_cached_bitmaps) {
if (cached_bitmap->bitmap_block_index == bitmap_block_index)
return cached_bitmap.ptr();
}
auto block = TRY(KBuffer::try_create_with_size("Ext2FS: Cached bitmap block"sv, block_size(), Memory::Region::Access::ReadWrite));
auto buffer = UserOrKernelBuffer::for_kernel_buffer(block->data());
TRY(read_block(bitmap_block_index, &buffer, block_size()));
auto new_bitmap = TRY(adopt_nonnull_own_or_enomem(new (nothrow) CachedBitmap(bitmap_block_index, move(block))));
TRY(m_cached_bitmaps.try_append(move(new_bitmap)));
return m_cached_bitmaps.last().ptr();
}
ErrorOr<void> Ext2FS::set_block_allocation_state(BlockIndex block_index, bool new_state)
{
VERIFY(block_index != 0);
MutexLocker locker(m_lock);
auto group_index = group_index_from_block_index(block_index);
unsigned index_in_group = (block_index.value() - first_block_index().value()) - ((group_index.value() - 1) * blocks_per_group());
unsigned bit_index = index_in_group % blocks_per_group();
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index));
dbgln_if(EXT2_DEBUG, "Ext2FS: Block {} state -> {} (in bitmap block {})", block_index, new_state, bgd.bg_block_bitmap);
return update_bitmap_block(bgd.bg_block_bitmap, bit_index, new_state, m_super_block.s_free_blocks_count, bgd.bg_free_blocks_count);
}
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FS::create_directory(Ext2FSInode& parent_inode, StringView name, mode_t mode, UserID uid, GroupID gid)
{
MutexLocker locker(m_lock);
VERIFY(is_directory(mode));
auto inode = TRY(create_inode(parent_inode, name, mode, 0, uid, gid));
dbgln_if(EXT2_DEBUG, "Ext2FS: create_directory: created new directory named '{} with inode {}", name, inode->index());
Vector<Ext2FSDirectoryEntry> entries;
auto current_directory_name = TRY(KString::try_create("."sv));
TRY(entries.try_empend(move(current_directory_name), inode->index(), static_cast<u8>(EXT2_FT_DIR)));
auto parent_directory_name = TRY(KString::try_create(".."sv));
TRY(entries.try_empend(move(parent_directory_name), parent_inode.index(), static_cast<u8>(EXT2_FT_DIR)));
TRY(static_cast<Ext2FSInode&>(*inode).write_directory(entries));
TRY(parent_inode.increment_link_count());
auto& bgd = const_cast<ext2_group_desc&>(group_descriptor(group_index_from_inode(inode->identifier().index())));
++bgd.bg_used_dirs_count;
m_block_group_descriptors_dirty = true;
return inode;
}
ErrorOr<NonnullLockRefPtr<Inode>> Ext2FS::create_inode(Ext2FSInode& parent_inode, StringView name, mode_t mode, dev_t dev, UserID uid, GroupID gid)
{
if (name.length() > EXT2_NAME_LEN)
return ENAMETOOLONG;
if (parent_inode.m_raw_inode.i_links_count == 0)
return ENOENT;
ext2_inode e2inode {};
auto now = kgettimeofday().to_truncated_seconds();
e2inode.i_mode = mode;
e2inode.i_uid = uid.value();
e2inode.i_gid = gid.value();
e2inode.i_size = 0;
e2inode.i_atime = now;
e2inode.i_ctime = now;
e2inode.i_mtime = now;
e2inode.i_dtime = 0;
e2inode.i_flags = 0;
// For directories, add +1 link count for the "." entry in self.
e2inode.i_links_count = is_directory(mode);
if (is_character_device(mode))
e2inode.i_block[0] = dev;
else if (is_block_device(mode))
e2inode.i_block[1] = dev;
auto inode_id = TRY(allocate_inode());
dbgln_if(EXT2_DEBUG, "Ext2FS: writing initial metadata for inode {}", inode_id.value());
TRY(write_ext2_inode(inode_id, e2inode));
auto new_inode = TRY(get_inode({ fsid(), inode_id }));
dbgln_if(EXT2_DEBUG, "Ext2FS: Adding inode '{}' (mode {:o}) to parent directory {}", name, mode, parent_inode.index());
TRY(parent_inode.add_child(*new_inode, name, mode));
return new_inode;
}
ErrorOr<void> Ext2FSInode::populate_lookup_cache()
{
VERIFY(m_inode_lock.is_exclusively_locked_by_current_thread());
@ -1632,12 +982,6 @@ ErrorOr<void> Ext2FSInode::decrement_link_count()
return {};
}
void Ext2FS::uncache_inode(InodeIndex index)
{
MutexLocker locker(m_lock);
m_inode_cache.remove(index);
}
ErrorOr<void> Ext2FSInode::chmod(mode_t mode)
{
MutexLocker locker(m_inode_lock);
@ -1682,41 +1026,4 @@ ErrorOr<int> Ext2FSInode::get_block_address(int index)
return m_block_list[index].value();
}
unsigned Ext2FS::total_block_count() const
{
MutexLocker locker(m_lock);
return super_block().s_blocks_count;
}
unsigned Ext2FS::free_block_count() const
{
MutexLocker locker(m_lock);
return super_block().s_free_blocks_count;
}
unsigned Ext2FS::total_inode_count() const
{
MutexLocker locker(m_lock);
return super_block().s_inodes_count;
}
unsigned Ext2FS::free_inode_count() const
{
MutexLocker locker(m_lock);
return super_block().s_free_inodes_count;
}
ErrorOr<void> Ext2FS::prepare_to_clear_last_mount()
{
MutexLocker locker(m_lock);
for (auto& it : m_inode_cache) {
if (it.value->ref_count() > 1)
return EBUSY;
}
BlockBasedFileSystem::remove_disk_cache_before_last_unmount();
m_inode_cache.clear();
m_root_inode = nullptr;
return {};
}
}

84
Kernel/FileSystem/Ext2FS/Inode.h Normal file
View File

@ -0,0 +1,84 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/HashMap.h>
#include <Kernel/FileSystem/Ext2FS/Definitions.h>
#include <Kernel/FileSystem/Ext2FS/DirectoryEntry.h>
#include <Kernel/FileSystem/Ext2FS/FileSystem.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class Ext2FSInode final : public Inode {
friend class Ext2FS;
public:
virtual ~Ext2FSInode() override;
u64 size() const;
bool is_symlink() const { return Kernel::is_symlink(m_raw_inode.i_mode); }
bool is_directory() const { return Kernel::is_directory(m_raw_inode.i_mode); }
private:
// ^Inode
virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
virtual InodeMetadata metadata() const override;
virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
virtual ErrorOr<NonnullLockRefPtr<Inode>> lookup(StringView name) override;
virtual ErrorOr<void> flush_metadata() override;
virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const& data, OpenFileDescription*) override;
virtual ErrorOr<NonnullLockRefPtr<Inode>> create_child(StringView name, mode_t, dev_t, UserID, GroupID) override;
virtual ErrorOr<void> add_child(Inode& child, StringView name, mode_t) override;
virtual ErrorOr<void> remove_child(StringView name) override;
virtual ErrorOr<void> update_timestamps(Optional<time_t> atime, Optional<time_t> ctime, Optional<time_t> mtime) override;
virtual ErrorOr<void> increment_link_count() override;
virtual ErrorOr<void> decrement_link_count() override;
virtual ErrorOr<void> chmod(mode_t) override;
virtual ErrorOr<void> chown(UserID, GroupID) override;
virtual ErrorOr<void> truncate(u64) override;
virtual ErrorOr<int> get_block_address(int) override;
ErrorOr<void> write_directory(Vector<Ext2FSDirectoryEntry>&);
ErrorOr<void> populate_lookup_cache();
ErrorOr<void> resize(u64);
ErrorOr<void> write_indirect_block(BlockBasedFileSystem::BlockIndex, Span<BlockBasedFileSystem::BlockIndex>);
ErrorOr<void> grow_doubly_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, Span<BlockBasedFileSystem::BlockIndex>, Vector<BlockBasedFileSystem::BlockIndex>&, unsigned&);
ErrorOr<void> shrink_doubly_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, size_t, unsigned&);
ErrorOr<void> grow_triply_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, Span<BlockBasedFileSystem::BlockIndex>, Vector<BlockBasedFileSystem::BlockIndex>&, unsigned&);
ErrorOr<void> shrink_triply_indirect_block(BlockBasedFileSystem::BlockIndex, size_t, size_t, unsigned&);
ErrorOr<void> flush_block_list();
ErrorOr<void> compute_block_list_with_exclusive_locking();
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list() const;
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list_with_meta_blocks() const;
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list_impl(bool include_block_list_blocks) const;
ErrorOr<Vector<BlockBasedFileSystem::BlockIndex>> compute_block_list_impl_internal(ext2_inode const&, bool include_block_list_blocks) const;
Ext2FS& fs();
Ext2FS const& fs() const;
Ext2FSInode(Ext2FS&, InodeIndex);
Vector<BlockBasedFileSystem::BlockIndex> m_block_list;
HashMap<NonnullOwnPtr<KString>, InodeIndex> m_lookup_cache;
ext2_inode m_raw_inode {};
Mutex m_block_list_lock { "BlockList"sv };
};
inline Ext2FS& Ext2FSInode::fs()
{
return static_cast<Ext2FS&>(Inode::fs());
}
inline Ext2FS const& Ext2FSInode::fs() const
{
return static_cast<Ext2FS const&>(Inode::fs());
}
}

0
Kernel/FileSystem/ext2_types.h → Kernel/FileSystem/Ext2FS/ext2_types.h
View File

2
Kernel/Storage/StorageManagement.cpp
View File

@ -20,7 +20,7 @@
#include <Kernel/CommandLine.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/FileSystem/Ext2FS/FileSystem.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Panic.h>
#include <Kernel/Storage/ATA/AHCI/Controller.h>

2
Kernel/Syscalls/mount.cpp
View File

@ -6,7 +6,7 @@
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/DevPtsFS/FileSystem.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/FileSystem/Ext2FS/FileSystem.h>
#include <Kernel/FileSystem/FATFS/FileSystem.h>
#include <Kernel/FileSystem/ISO9660FS/FileSystem.h>
#include <Kernel/FileSystem/Plan9FS/FileSystem.h>

4
Meta/check-debug-flags.sh
View File

@ -26,7 +26,7 @@ done < <(
'*.cpp' \
'*.h' \
'*.in' \
':!:Kernel/FileSystem/ext2_fs.h'
':!:Kernel/FileSystem/Ext2FS/Definitions.h'
else
# We're in the middle of a pre-commit run, so we should only check the files that have
# actually changed. The reason is that "git ls-files | grep" on the entire repo takes
@ -34,7 +34,7 @@ done < <(
# pre-commit hook. It is unnecessary to check the entire repository on every single
# commit, so we save some time here.
for file in "$@"; do
if [[ ("${file}" =~ \.cpp || "${file}" =~ \.h || "${file}" =~ \.in) && ! "${file}" == "Kernel/FileSystem/ext2_fs.h" ]]; then
if [[ ("${file}" =~ \.cpp || "${file}" =~ \.h || "${file}" =~ \.in) ]]; then
echo "$file"
fi
done

2
Meta/check-newlines-at-eof.py
View File

@ -18,7 +18,7 @@ def should_check_file(filename):
return False
if filename.startswith('Userland/Libraries/LibCpp/Tests/preprocessor/'):
return False
if filename == 'Kernel/FileSystem/ext2_fs.h':
if filename == 'Kernel/FileSystem/Ext2FS/Definitions.h':
return False
if filename.endswith('.txt'):
return 'CMake' in filename

2
Meta/check-style.py
View File

@ -44,7 +44,7 @@ def should_check_file(filename):
return False
if filename.startswith('Base/'):
return False
if filename == 'Kernel/FileSystem/ext2_fs.h':
if filename == 'Kernel/FileSystem/Ext2FS/Definitions.h':
return False
return True

2
Meta/lint-clang-format.sh
View File

@ -11,7 +11,7 @@ if [ "$#" -eq "1" ]; then
'*.cpp' \
'*.h' \
':!:Base' \
':!:Kernel/FileSystem/ext2_fs.h' \
':!:Kernel/FileSystem/Ext2FS/Definitions.h' \
':!:Userland/Libraries/LibCodeComprehension/Cpp/Tests/*' \
':!:Userland/Libraries/LibCpp/Tests/parser/*' \
':!:Userland/Libraries/LibCpp/Tests/preprocessor/*'