mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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544 lines
22 KiB
C++
544 lines
22 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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namespace ams::fssystem {
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namespace {
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using Node = impl::BucketTreeNode<const s64 *>;
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static_assert(sizeof(Node) == sizeof(BucketTree::NodeHeader));
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static_assert(util::is_pod<Node>::value);
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constexpr inline s32 NodeHeaderSize = sizeof(BucketTree::NodeHeader);
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class StorageNode {
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private:
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class Offset {
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public:
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using difference_type = s64;
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private:
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s64 offset;
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s32 stride;
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public:
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constexpr Offset(s64 offset, s32 stride) : offset(offset), stride(stride) { /* ... */ }
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constexpr Offset &operator++() { this->offset += this->stride; return *this; }
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constexpr Offset operator++(int) { Offset ret(*this); this->offset += this->stride; return ret; }
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constexpr Offset &operator--() { this->offset -= this->stride; return *this; }
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constexpr Offset operator--(int) { Offset ret(*this); this->offset -= this->stride; return ret; }
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constexpr difference_type operator-(const Offset &rhs) const { return (this->offset - rhs.offset) / this->stride; }
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constexpr Offset operator+(difference_type ofs) const { return Offset(this->offset + ofs * this->stride, this->stride); }
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constexpr Offset operator-(difference_type ofs) const { return Offset(this->offset - ofs * this->stride, this->stride); }
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constexpr Offset &operator+=(difference_type ofs) { this->offset += ofs * this->stride; return *this; }
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constexpr Offset &operator-=(difference_type ofs) { this->offset -= ofs * this->stride; return *this; }
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constexpr bool operator==(const Offset &rhs) const { return this->offset == rhs.offset; }
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constexpr bool operator!=(const Offset &rhs) const { return this->offset != rhs.offset; }
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constexpr s64 Get() const { return this->offset; }
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};
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private:
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const Offset start;
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const s32 count;
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s32 index;
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public:
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StorageNode(size_t size, s32 count) : start(NodeHeaderSize, static_cast<s32>(size)), count(count), index(-1) { /* ... */ }
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StorageNode(s64 ofs, size_t size, s32 count) : start(NodeHeaderSize + ofs, static_cast<s32>(size)), count(count), index(-1) { /* ... */ }
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s32 GetIndex() const { return this->index; }
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void Find(const char *buffer, s64 virtual_address) {
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s32 end = this->count;
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auto pos = this->start;
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while (end > 0) {
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auto half = end / 2;
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auto mid = pos + half;
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s64 offset = 0;
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std::memcpy(std::addressof(offset), buffer + mid.Get(), sizeof(s64));
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if (offset <= virtual_address) {
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pos = mid + 1;
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end -= half + 1;
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} else {
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end = half;
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}
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}
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this->index = static_cast<s32>(pos - this->start) - 1;
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}
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Result Find(fs::SubStorage &storage, s64 virtual_address) {
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s32 end = this->count;
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auto pos = this->start;
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while (end > 0) {
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auto half = end / 2;
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auto mid = pos + half;
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s64 offset = 0;
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R_TRY(storage.Read(mid.Get(), std::addressof(offset), sizeof(s64)));
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if (offset <= virtual_address) {
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pos = mid + 1;
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end -= half + 1;
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} else {
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end = half;
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}
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}
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this->index = static_cast<s32>(pos - this->start) - 1;
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return ResultSuccess();
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}
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};
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}
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void BucketTree::Header::Format(s32 entry_count) {
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AMS_ASSERT(entry_count >= 0);
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this->magic = Magic;
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this->version = Version;
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this->entry_count = entry_count;
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this->reserved = 0;
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}
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Result BucketTree::Header::Verify() const {
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R_UNLESS(this->magic == Magic, fs::ResultInvalidBucketTreeSignature());
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R_UNLESS(this->entry_count >= 0, fs::ResultInvalidBucketTreeEntryCount());
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R_UNLESS(this->version <= Version, fs::ResultUnsupportedVersion());
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return ResultSuccess();
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}
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Result BucketTree::NodeHeader::Verify(s32 node_index, size_t node_size, size_t entry_size) const {
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R_UNLESS(this->index == node_index, fs::ResultInvalidArgument());
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R_UNLESS(entry_size == 0 || node_size < entry_size + NodeHeaderSize, fs::ResultInvalidSize());
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const size_t max_entry_count = (node_size - NodeHeaderSize) / entry_size;
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R_UNLESS(this->count > 0 && static_cast<size_t>(this->count) <= max_entry_count, fs::ResultInvalidBucketTreeNodeEntryCount());
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R_UNLESS(this->offset > 0, fs::ResultInvalidBucketTreeNodeOffset());
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return ResultSuccess();
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}
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Result BucketTree::Initialize(IAllocator *allocator, fs::SubStorage node_storage, fs::SubStorage entry_storage, size_t node_size, size_t entry_size, s32 entry_count) {
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/* Validate preconditions. */
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AMS_ASSERT(allocator != nullptr);
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AMS_ASSERT(entry_size >= sizeof(s64));
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AMS_ASSERT(node_size >= entry_size + sizeof(NodeHeader));
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AMS_ASSERT(NodeSizeMin <= node_size && node_size <= NodeSizeMax);
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AMS_ASSERT(util::IsPowerOfTwo(node_size));
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AMS_ASSERT(!this->IsInitialized());
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/* Ensure valid entry count. */
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R_UNLESS(entry_count > 0, fs::ResultInvalidArgument());
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/* Allocate node. */
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R_UNLESS(this->node_l1.Allocate(allocator, node_size), fs::ResultBufferAllocationFailed());
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auto node_guard = SCOPE_GUARD { this->node_l1.Free(node_size); };
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/* Read node. */
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R_TRY(node_storage.Read(0, this->node_l1.Get(), node_size));
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/* Verify node. */
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R_TRY(this->node_l1->Verify(0, node_size, sizeof(s64)));
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/* Validate offsets. */
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const auto offset_count = GetOffsetCount(node_size);
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const auto entry_set_count = GetEntrySetCount(node_size, entry_size, entry_count);
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const auto * const node = this->node_l1.Get<Node>();
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s64 start_offset;
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if (offset_count < entry_set_count && node->GetCount() < offset_count) {
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start_offset = *node->GetEnd();
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} else {
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start_offset = *node->GetBegin();
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}
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const auto end_offset = node->GetEndOffset();
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R_UNLESS(0 <= start_offset && start_offset <= node->GetBeginOffset(), fs::ResultInvalidBucketTreeEntryOffset());
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R_UNLESS(start_offset < end_offset, fs::ResultInvalidBucketTreeEntryOffset());
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/* Set member variables. */
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this->node_storage = node_storage;
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this->entry_storage = entry_storage;
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this->node_size = node_size;
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this->entry_size = entry_size;
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this->entry_count = entry_count;
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this->offset_count = offset_count;
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this->entry_set_count = entry_set_count;
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this->start_offset = start_offset;
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this->end_offset = end_offset;
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/* Cancel guard. */
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node_guard.Cancel();
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return ResultSuccess();
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}
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void BucketTree::Initialize(size_t node_size, s64 end_offset) {
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AMS_ASSERT(NodeSizeMin <= node_size && node_size <= NodeSizeMax);
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AMS_ASSERT(util::IsPowerOfTwo(node_size));
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AMS_ASSERT(end_offset > 0);
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AMS_ASSERT(!this->IsInitialized());
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this->node_size = node_size;
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this->end_offset = end_offset;
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}
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void BucketTree::Finalize() {
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if (this->IsInitialized()) {
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this->node_storage = fs::SubStorage();
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this->entry_storage = fs::SubStorage();
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this->node_l1.Free(this->node_size);
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this->node_size = 0;
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this->entry_size = 0;
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this->entry_count = 0;
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this->offset_count = 0;
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this->entry_set_count = 0;
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this->start_offset = 0;
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this->end_offset = 0;
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}
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}
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Result BucketTree::Find(Visitor *visitor, s64 virtual_address) const {
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AMS_ASSERT(visitor != nullptr);
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AMS_ASSERT(this->IsInitialized());
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R_UNLESS(virtual_address >= 0, fs::ResultInvalidOffset());
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R_UNLESS(!this->IsEmpty(), fs::ResultOutOfRange());
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R_TRY(visitor->Initialize(this));
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return visitor->Find(virtual_address);
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}
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Result BucketTree::InvalidateCache() {
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/* Invalidate the node storage cache. */
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{
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s64 storage_size;
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R_TRY(this->node_storage.GetSize(std::addressof(storage_size)));
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R_TRY(this->node_storage.OperateRange(fs::OperationId::InvalidateCache, 0, storage_size));
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}
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/* Refresh start/end offsets. */
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{
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/* Read node. */
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R_TRY(node_storage.Read(0, this->node_l1.Get(), this->node_size));
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/* Verify node. */
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R_TRY(this->node_l1->Verify(0, this->node_size, sizeof(s64)));
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/* Validate offsets. */
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const auto * const node = this->node_l1.Get<Node>();
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s64 start_offset;
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if (offset_count < this->entry_set_count && node->GetCount() < this->offset_count) {
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start_offset = *node->GetEnd();
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} else {
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start_offset = *node->GetBegin();
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}
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const auto end_offset = node->GetEndOffset();
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R_UNLESS(0 <= start_offset && start_offset <= node->GetBeginOffset(), fs::ResultInvalidBucketTreeEntryOffset());
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R_UNLESS(start_offset < end_offset, fs::ResultInvalidBucketTreeEntryOffset());
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/* Set refreshed offsets. */
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this->start_offset = start_offset;
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this->end_offset = end_offset;
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}
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/* Invalidate the entry storage cache. */
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{
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s64 storage_size;
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R_TRY(this->entry_storage.GetSize(std::addressof(storage_size)));
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R_TRY(this->entry_storage.OperateRange(fs::OperationId::InvalidateCache, 0, storage_size));
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}
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return ResultSuccess();
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}
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Result BucketTree::Visitor::Initialize(const BucketTree *tree) {
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AMS_ASSERT(tree != nullptr);
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AMS_ASSERT(this->tree == nullptr || this->tree == tree);
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if (this->entry == nullptr) {
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this->entry = tree->GetAllocator()->Allocate(tree->entry_size);
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R_UNLESS(this->entry != nullptr, fs::ResultBufferAllocationFailed());
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this->tree = tree;
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}
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return ResultSuccess();
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}
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Result BucketTree::Visitor::MoveNext() {
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R_UNLESS(this->IsValid(), fs::ResultOutOfRange());
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/* Invalidate our index, and read the header for the next index. */
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auto entry_index = this->entry_index + 1;
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if (entry_index == this->entry_set.info.count) {
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const auto entry_set_index = this->entry_set.info.index + 1;
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R_UNLESS(entry_set_index < this->entry_set_count, fs::ResultOutOfRange());
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this->entry_index = -1;
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const auto end = this->entry_set.info.end;
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const auto entry_set_size = this->tree->node_size;
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const auto entry_set_offset = entry_set_index * static_cast<s64>(entry_set_size);
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R_TRY(this->tree->entry_storage.Read(entry_set_offset, std::addressof(this->entry_set), sizeof(EntrySetHeader)));
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R_TRY(this->entry_set.header.Verify(entry_set_index, entry_set_size, this->tree->entry_size));
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R_UNLESS(this->entry_set.info.start == end && this->entry_set.info.start < this->entry_set.info.end, fs::ResultInvalidBucketTreeEntrySetOffset());
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entry_index = 0;
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} else {
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this->entry_index = 1;
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}
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/* Read the new entry. */
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const auto entry_size = this->tree->entry_size;
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const auto entry_offset = impl::GetBucketTreeEntryOffset(this->entry_set.info.index, this->tree->node_size, entry_size, entry_index);
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R_TRY(this->tree->entry_storage.Read(entry_offset, std::addressof(this->entry), entry_size));
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/* Note that we changed index. */
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this->entry_index = entry_index;
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return ResultSuccess();
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}
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Result BucketTree::Visitor::MovePrevious() {
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R_UNLESS(this->IsValid(), fs::ResultOutOfRange());
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/* Invalidate our index, and read the heasder for the previous index. */
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auto entry_index = this->entry_index;
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if (entry_index == 0) {
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R_UNLESS(this->entry_set.info.index > 0, fs::ResultOutOfRange());
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this->entry_index = -1;
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const auto start = this->entry_set.info.start;
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const auto entry_set_size = this->tree->node_size;
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const auto entry_set_index = this->entry_set.info.index - 1;
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const auto entry_set_offset = entry_set_index * static_cast<s64>(entry_set_size);
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R_TRY(this->tree->entry_storage.Read(entry_set_offset, std::addressof(this->entry_set), sizeof(EntrySetHeader)));
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R_TRY(this->entry_set.header.Verify(entry_set_index, entry_set_size, this->tree->entry_size));
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R_UNLESS(this->entry_set.info.end == start && this->entry_set.info.start < this->entry_set.info.end, fs::ResultInvalidBucketTreeEntrySetOffset());
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entry_index = this->entry_set.info.count;
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} else {
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this->entry_index = -1;
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}
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--entry_index;
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/* Read the new entry. */
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const auto entry_size = this->tree->entry_size;
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const auto entry_offset = impl::GetBucketTreeEntryOffset(this->entry_set.info.index, this->tree->node_size, entry_size, entry_index);
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R_TRY(this->tree->entry_storage.Read(entry_offset, std::addressof(this->entry), entry_size));
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/* Note that we changed index. */
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this->entry_index = entry_index;
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return ResultSuccess();
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}
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Result BucketTree::Visitor::Find(s64 virtual_address) {
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AMS_ASSERT(this->tree != nullptr);
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/* Get the node. */
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const auto * const node = this->tree->node_l1.Get<Node>();
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R_UNLESS(virtual_address < node->GetEndOffset(), fs::ResultOutOfRange());
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/* Get the entry set index. */
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s32 entry_set_index = -1;
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if (this->tree->IsExistOffsetL2OnL1() && virtual_address < node->GetBeginOffset()) {
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const auto start = node->GetEnd();
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const auto end = node->GetBegin() + tree->offset_count;
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auto pos = std::upper_bound(start, end, virtual_address);
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R_UNLESS(start < pos, fs::ResultOutOfRange());
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--pos;
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entry_set_index = static_cast<s32>(pos - start);
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} else {
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const auto start = node->GetBegin();
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const auto end = node->GetEnd();
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auto pos = std::upper_bound(start, end, virtual_address);
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R_UNLESS(start < pos, fs::ResultOutOfRange());
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--pos;
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if (this->tree->IsExistL2()) {
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const auto node_index = static_cast<s32>(pos - start);
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R_UNLESS(0 <= node_index && node_index < this->tree->offset_count, fs::ResultInvalidBucketTreeNodeOffset());
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R_TRY(this->FindEntrySet(std::addressof(entry_set_index), virtual_address, node_index));
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} else {
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entry_set_index = static_cast<s32>(pos - start);
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}
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}
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/* Validate the entry set index. */
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R_UNLESS(0 <= entry_set_index && entry_set_index < this->tree->entry_set_count, fs::ResultInvalidBucketTreeNodeOffset());
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/* Find the entry. */
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R_TRY(this->FindEntry(virtual_address, entry_set_index));
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/* Set count. */
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this->entry_set_count = this->tree->entry_set_count;
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return ResultSuccess();
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}
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Result BucketTree::Visitor::FindEntrySet(s32 *out_index, s64 virtual_address, s32 node_index) {
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const auto node_size = this->tree->node_size;
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PooledBuffer pool(node_size, 1);
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if (node_size <= pool.GetSize()) {
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return this->FindEntrySetWithBuffer(out_index, virtual_address, node_index, pool.GetBuffer());
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} else {
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pool.Deallocate();
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return this->FindEntrySetWithoutBuffer(out_index, virtual_address, node_index);
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}
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}
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Result BucketTree::Visitor::FindEntrySetWithBuffer(s32 *out_index, s64 virtual_address, s32 node_index, char *buffer) {
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/* Calculate node extents. */
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const auto node_size = this->tree->node_size;
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const auto node_offset = (node_index + 1) * static_cast<s64>(node_size);
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fs::SubStorage &storage = tree->node_storage;
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/* Read the node. */
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R_TRY(storage.Read(node_offset, buffer, node_size));
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/* Validate the header. */
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NodeHeader header;
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std::memcpy(std::addressof(header), buffer, NodeHeaderSize);
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R_TRY(header.Verify(node_index, node_size, sizeof(s64)));
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/* Create the node, and find. */
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StorageNode node(sizeof(s64), header.count);
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node.Find(buffer, virtual_address);
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R_UNLESS(node.GetIndex() >= 0, fs::ResultOutOfRange());
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/* Return the index. */
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*out_index = this->tree->GetEntrySetIndex(header.index, node.GetIndex());
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return ResultSuccess();
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}
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Result BucketTree::Visitor::FindEntrySetWithoutBuffer(s32 *out_index, s64 virtual_address, s32 node_index) {
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/* Calculate node extents. */
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const auto node_size = this->tree->node_size;
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const auto node_offset = (node_index + 1) * static_cast<s64>(node_size);
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fs::SubStorage &storage = tree->node_storage;
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/* Read and validate the header. */
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NodeHeader header;
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R_TRY(storage.Read(node_offset, std::addressof(header), NodeHeaderSize));
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R_TRY(header.Verify(node_index, node_size, sizeof(s64)));
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/* Create the node, and find. */
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StorageNode node(node_offset, sizeof(s64), header.count);
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R_TRY(node.Find(storage, virtual_address));
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|
R_UNLESS(node.GetIndex() >= 0, fs::ResultOutOfRange());
|
|
|
|
/* Return the index. */
|
|
*out_index = this->tree->GetEntrySetIndex(header.index, node.GetIndex());
|
|
return ResultSuccess();
|
|
}
|
|
|
|
Result BucketTree::Visitor::FindEntry(s64 virtual_address, s32 entry_set_index) {
|
|
const auto entry_set_size = this->tree->node_size;
|
|
|
|
PooledBuffer pool(entry_set_size, 1);
|
|
if (entry_set_size <= pool.GetSize()) {
|
|
return this->FindEntryWithBuffer(virtual_address, entry_set_index, pool.GetBuffer());
|
|
} else {
|
|
pool.Deallocate();
|
|
return this->FindEntryWithoutBuffer(virtual_address, entry_set_index);
|
|
}
|
|
}
|
|
|
|
Result BucketTree::Visitor::FindEntryWithBuffer(s64 virtual_address, s32 entry_set_index, char *buffer) {
|
|
/* Calculate entry set extents. */
|
|
const auto entry_size = this->tree->entry_size;
|
|
const auto entry_set_size = this->tree->node_size;
|
|
const auto entry_set_offset = entry_set_index * static_cast<s64>(entry_set_size);
|
|
fs::SubStorage &storage = tree->node_storage;
|
|
|
|
/* Read the entry set. */
|
|
R_TRY(storage.Read(entry_set_offset, buffer, entry_set_size));
|
|
|
|
/* Validate the entry_set. */
|
|
EntrySetHeader entry_set;
|
|
std::memcpy(std::addressof(entry_set), buffer, sizeof(EntrySetHeader));
|
|
R_TRY(entry_set.header.Verify(entry_set_index, entry_set_size, entry_size));
|
|
|
|
/* Create the node, and find. */
|
|
StorageNode node(entry_size, entry_set.info.count);
|
|
node.Find(buffer, virtual_address);
|
|
R_UNLESS(node.GetIndex() >= 0, fs::ResultOutOfRange());
|
|
|
|
/* Copy the data into entry. */
|
|
const auto entry_index = node.GetIndex();
|
|
const auto entry_offset = impl::GetBucketTreeEntryOffset(0, entry_size, entry_index);
|
|
std::memcpy(this->entry, buffer + entry_offset, entry_size);
|
|
|
|
/* Set our entry set/index. */
|
|
this->entry_set = entry_set;
|
|
this->entry_index = entry_index;
|
|
|
|
return ResultSuccess();
|
|
}
|
|
|
|
Result BucketTree::Visitor::FindEntryWithoutBuffer(s64 virtual_address, s32 entry_set_index) {
|
|
/* Calculate entry set extents. */
|
|
const auto entry_size = this->tree->entry_size;
|
|
const auto entry_set_size = this->tree->node_size;
|
|
const auto entry_set_offset = entry_set_index * static_cast<s64>(entry_set_size);
|
|
fs::SubStorage &storage = tree->node_storage;
|
|
|
|
/* Read and validate the entry_set. */
|
|
EntrySetHeader entry_set;
|
|
R_TRY(storage.Read(entry_set_offset, std::addressof(entry_set), sizeof(EntrySetHeader)));
|
|
R_TRY(entry_set.header.Verify(entry_set_index, entry_set_size, entry_size));
|
|
|
|
/* Create the node, and find. */
|
|
StorageNode node(entry_set_offset, entry_size, entry_set.info.count);
|
|
R_TRY(node.Find(storage, virtual_address));
|
|
R_UNLESS(node.GetIndex() >= 0, fs::ResultOutOfRange());
|
|
|
|
/* Copy the data into entry. */
|
|
const auto entry_index = node.GetIndex();
|
|
const auto entry_offset = impl::GetBucketTreeEntryOffset(entry_set_offset, entry_size, entry_index);
|
|
R_TRY(storage.Read(entry_offset, this->entry, entry_size));
|
|
|
|
/* Set our entry set/index. */
|
|
this->entry_set = entry_set;
|
|
this->entry_index = entry_index;
|
|
|
|
return ResultSuccess();
|
|
}
|
|
|
|
}
|