Atmosphere/libraries/libstratosphere/include/stratosphere/fssystem/fssystem_bucket_tree.hpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours.hpp>
#include <stratosphere/fs/fs_substorage.hpp>
namespace ams::fssystem {
class BucketTree {
NON_COPYABLE(BucketTree);
NON_MOVEABLE(BucketTree);
public:
static constexpr u32 Magic = util::FourCC<'B','K','T','R'>::Code;
static constexpr u32 Version = 1;
static constexpr size_t NodeSizeMin = 1_KB;
static constexpr size_t NodeSizeMax = 512_KB;
public:
class Visitor;
struct Header {
u32 magic;
u32 version;
s32 entry_count;
s32 reserved;
void Format(s32 entry_count);
Result Verify() const;
};
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static_assert(util::is_pod<Header>::value);
static_assert(sizeof(Header) == 0x10);
struct NodeHeader {
s32 index;
s32 count;
s64 offset;
Result Verify(s32 node_index, size_t node_size, size_t entry_size) const;
};
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static_assert(util::is_pod<NodeHeader>::value);
static_assert(sizeof(NodeHeader) == 0x10);
class ContinuousReadingInfo {
private:
size_t read_size;
s32 skip_count;
bool done;
public:
constexpr ContinuousReadingInfo() : read_size(), skip_count(), done() { /* ... */ }
constexpr void Reset() { this->read_size = 0; this->skip_count = 0; this->done = false; }
constexpr void SetSkipCount(s32 count) { AMS_ASSERT(count >= 0); this->skip_count = count; }
constexpr s32 GetSkipCount() const { return this->skip_count; }
constexpr bool CheckNeedScan() { return (--this->skip_count) <= 0; }
constexpr void Done() { this->read_size = 0; this->done = true; }
constexpr bool IsDone() const { return this->done; }
constexpr void SetReadSize(size_t size) { this->read_size = size; }
constexpr size_t GetReadSize() const { return this->read_size; }
constexpr bool CanDo() const { return this->read_size > 0; }
};
using IAllocator = MemoryResource;
private:
class NodeBuffer {
NON_COPYABLE(NodeBuffer);
private:
IAllocator *allocator;
void *header;
public:
NodeBuffer() : allocator(), header() { /* ... */ }
~NodeBuffer() {
AMS_ASSERT(this->header == nullptr);
}
NodeBuffer(NodeBuffer &&rhs) : allocator(rhs.allocator), header(rhs.allocator) {
rhs.allocator = nullptr;
rhs.header = nullptr;
}
NodeBuffer &operator=(NodeBuffer &&rhs) {
if (this != std::addressof(rhs)) {
AMS_ASSERT(this->header == nullptr);
this->allocator = rhs.allocator;
this->header = rhs.header;
rhs.allocator = nullptr;
rhs.header = nullptr;
}
return *this;
}
bool Allocate(IAllocator *allocator, size_t node_size) {
AMS_ASSERT(this->header == nullptr);
this->allocator = allocator;
this->header = allocator->Allocate(node_size, sizeof(s64));
AMS_ASSERT(util::IsAligned(this->header, sizeof(s64)));
return this->header != nullptr;
}
void Free(size_t node_size) {
if (this->header) {
this->allocator->Deallocate(this->header, node_size);
this->header = nullptr;
}
this->allocator = nullptr;
}
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void FillZero(size_t node_size) const {
if (this->header) {
std::memset(this->header, 0, node_size);
}
}
NodeHeader *Get() const {
return reinterpret_cast<NodeHeader *>(this->header);
}
NodeHeader *operator->() const { return this->Get(); }
template<typename T>
T *Get() const {
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static_assert(util::is_pod<T>::value);
static_assert(sizeof(T) == sizeof(NodeHeader));
return reinterpret_cast<T *>(this->header);
}
IAllocator *GetAllocator() const {
return this->allocator;
}
};
private:
static constexpr s32 GetEntryCount(size_t node_size, size_t entry_size) {
return static_cast<s32>((node_size - sizeof(NodeHeader)) / entry_size);
}
static constexpr s32 GetOffsetCount(size_t node_size) {
return static_cast<s32>((node_size - sizeof(NodeHeader)) / sizeof(s64));
}
static constexpr s32 GetEntrySetCount(size_t node_size, size_t entry_size, s32 entry_count) {
const s32 entry_count_per_node = GetEntryCount(node_size, entry_size);
return util::DivideUp(entry_count, entry_count_per_node);
}
static constexpr s32 GetNodeL2Count(size_t node_size, size_t entry_size, s32 entry_count) {
const s32 offset_count_per_node = GetOffsetCount(node_size);
const s32 entry_set_count = GetEntrySetCount(node_size, entry_size, entry_count);
if (entry_set_count <= offset_count_per_node) {
return 0;
}
const s32 node_l2_count = util::DivideUp(entry_set_count, offset_count_per_node);
AMS_ABORT_UNLESS(node_l2_count <= offset_count_per_node);
return util::DivideUp(entry_set_count - (offset_count_per_node - (node_l2_count - 1)), offset_count_per_node);
}
public:
static constexpr s64 QueryHeaderStorageSize() { return sizeof(Header); }
static constexpr s64 QueryNodeStorageSize(size_t node_size, size_t entry_size, s32 entry_count) {
AMS_ASSERT(entry_size >= sizeof(s64));
AMS_ASSERT(node_size >= entry_size + sizeof(NodeHeader));
AMS_ASSERT(NodeSizeMin <= node_size && node_size <= NodeSizeMax);
AMS_ASSERT(util::IsPowerOfTwo(node_size));
AMS_ASSERT(entry_count >= 0);
if (entry_count <= 0) {
return 0;
}
return (1 + GetNodeL2Count(node_size, entry_size, entry_count)) * static_cast<s64>(node_size);
}
static constexpr s64 QueryEntryStorageSize(size_t node_size, size_t entry_size, s32 entry_count) {
AMS_ASSERT(entry_size >= sizeof(s64));
AMS_ASSERT(node_size >= entry_size + sizeof(NodeHeader));
AMS_ASSERT(NodeSizeMin <= node_size && node_size <= NodeSizeMax);
AMS_ASSERT(util::IsPowerOfTwo(node_size));
AMS_ASSERT(entry_count >= 0);
if (entry_count <= 0) {
return 0;
}
return GetEntrySetCount(node_size, entry_size, entry_count) * static_cast<s64>(node_size);
}
private:
mutable fs::SubStorage node_storage;
mutable fs::SubStorage entry_storage;
NodeBuffer node_l1;
size_t node_size;
size_t entry_size;
s32 entry_count;
s32 offset_count;
s32 entry_set_count;
s64 start_offset;
s64 end_offset;
public:
BucketTree() : node_storage(), entry_storage(), node_l1(), node_size(), entry_size(), entry_count(), offset_count(), entry_set_count(), start_offset(), end_offset() { /* ... */ }
~BucketTree() { this->Finalize(); }
Result Initialize(IAllocator *allocator, fs::SubStorage node_storage, fs::SubStorage entry_storage, size_t node_size, size_t entry_size, s32 entry_count);
void Initialize(size_t node_size, s64 end_offset);
void Finalize();
bool IsInitialized() const { return this->node_size > 0; }
bool IsEmpty() const { return this->entry_size == 0; }
Result Find(Visitor *visitor, s64 virtual_address) const;
Result InvalidateCache();
s32 GetEntryCount() const { return this->entry_count; }
IAllocator *GetAllocator() const { return this->node_l1.GetAllocator(); }
s64 GetStart() const { return this->start_offset; }
s64 GetEnd() const { return this->end_offset; }
s64 GetSize() const { return this->end_offset - this->start_offset; }
bool Includes(s64 offset) const {
return this->start_offset <= offset && offset < this->end_offset;
}
bool Includes(s64 offset, s64 size) const {
return size > 0 && this->start_offset <= offset && size <= this->end_offset - offset;
}
private:
template<typename EntryType>
struct ContinuousReadingParam {
s64 offset;
size_t size;
NodeHeader entry_set;
s32 entry_index;
EntryType entry;
};
private:
template<typename EntryType>
Result ScanContinuousReading(ContinuousReadingInfo *out_info, const ContinuousReadingParam<EntryType> &param) const;
bool IsExistL2() const { return this->offset_count < this->entry_set_count; }
bool IsExistOffsetL2OnL1() const { return this->IsExistL2() && this->node_l1->count < this->offset_count; }
s64 GetEntrySetIndex(s32 node_index, s32 offset_index) const {
return (this->offset_count - this->node_l1->count) + (this->offset_count * node_index) + offset_index;
}
};
class BucketTree::Visitor {
NON_COPYABLE(Visitor);
NON_MOVEABLE(Visitor);
private:
friend class BucketTree;
union EntrySetHeader {
NodeHeader header;
struct Info {
s32 index;
s32 count;
s64 end;
s64 start;
} info;
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static_assert(util::is_pod<Info>::value);
};
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static_assert(util::is_pod<EntrySetHeader>::value);
private:
const BucketTree *tree;
void *entry;
s32 entry_index;
s32 entry_set_count;
EntrySetHeader entry_set;
public:
constexpr Visitor() : tree(), entry(), entry_index(-1), entry_set_count(), entry_set{} { /* ... */ }
~Visitor() {
if (this->entry != nullptr) {
this->tree->GetAllocator()->Deallocate(this->entry, this->tree->entry_size);
this->tree = nullptr;
this->entry = nullptr;
}
}
bool IsValid() const { return this->entry_index >= 0; }
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bool CanMoveNext() const { return this->IsValid() && (this->entry_index + 1 < this->entry_set.info.count || this->entry_set.info.index + 1 < this->entry_set_count); }
bool CanMovePrevious() const { return this->IsValid() && (this->entry_index > 0 || this->entry_set.info.index > 0); }
Result MoveNext();
Result MovePrevious();
template<typename EntryType>
Result ScanContinuousReading(ContinuousReadingInfo *out_info, s64 offset, size_t size) const;
const void *Get() const { AMS_ASSERT(this->IsValid()); return this->entry; }
template<typename T>
const T *Get() const { AMS_ASSERT(this->IsValid()); return reinterpret_cast<const T *>(this->entry); }
const BucketTree *GetTree() const { return this->tree; }
private:
Result Initialize(const BucketTree *tree);
Result Find(s64 virtual_address);
Result FindEntrySet(s32 *out_index, s64 virtual_address, s32 node_index);
Result FindEntrySetWithBuffer(s32 *out_index, s64 virtual_address, s32 node_index, char *buffer);
Result FindEntrySetWithoutBuffer(s32 *out_index, s64 virtual_address, s32 node_index);
Result FindEntry(s64 virtual_address, s32 entry_set_index);
Result FindEntryWithBuffer(s64 virtual_address, s32 entry_set_index, char *buffer);
Result FindEntryWithoutBuffer(s64 virtual_address, s32 entry_set_index);
};
}