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ams.mitm: greatly reduce memory requirements to build romfs

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This commit is contained in:
Michael Scire 2020-03-18 00:07:19 -07:00
parent 7dd4e76c1d
commit 37f7afb426
2 changed files with 283 additions and 121 deletions
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399
stratosphere/ams_mitm/source/fs_mitm/fsmitm_romfs.cpp
View file

@ -64,21 +64,167 @@ namespace ams::mitm::fs {
};
static_assert(std::is_pod<FileEntry>::value && sizeof(FileEntry) == 0x20);
constexpr inline DirectoryEntry *GetDirectoryEntry(void *dir_table, u32 offset) {
return reinterpret_cast<DirectoryEntry *>(reinterpret_cast<uintptr_t>(dir_table) + offset);
}
template<typename Entry>
class TableReader {
NON_COPYABLE(TableReader);
NON_MOVEABLE(TableReader);
private:
static constexpr size_t MaxCachedSize = (1_MB / 4);
static constexpr size_t FallbackCacheSize = 1_KB;
private:
ams::fs::IStorage *storage;
size_t offset;
size_t size;
size_t cache_idx;
void *cache;
u8 fallback_cache[FallbackCacheSize];
private:
ALWAYS_INLINE void Read(size_t ofs, void *dst, size_t size) {
R_ABORT_UNLESS(this->storage->Read(this->offset + ofs, dst, size));
}
ALWAYS_INLINE void ReloadCacheImpl(size_t idx) {
const size_t rel_ofs = idx * MaxCachedSize;
AMS_ABORT_UNLESS(rel_ofs < this->size);
const size_t new_cache_size = std::min(this->size - rel_ofs, MaxCachedSize);
this->Read(rel_ofs, this->cache, new_cache_size);
this->cache_idx = idx;
}
constexpr inline FileEntry *GetFileEntry(void *file_table, u32 offset) {
return reinterpret_cast<FileEntry *>(reinterpret_cast<uintptr_t>(file_table) + offset);
}
ALWAYS_INLINE void ReloadCache(size_t idx) {
if (this->cache_idx != idx) {
this->ReloadCacheImpl(idx);
}
}
constexpr inline const DirectoryEntry *GetDirectoryEntry(const void *dir_table, u32 offset) {
return reinterpret_cast<const DirectoryEntry *>(reinterpret_cast<uintptr_t>(dir_table) + offset);
}
ALWAYS_INLINE size_t GetCacheIndex(u32 ofs) {
return ofs / MaxCachedSize;
}
public:
TableReader(ams::fs::IStorage *s, size_t ofs, size_t sz) : storage(s), offset(ofs), size(sz), cache_idx(0) {
this->cache = std::malloc(std::min(sz, MaxCachedSize));
AMS_ABORT_UNLESS(this->cache != nullptr);
this->ReloadCacheImpl(0);
}
~TableReader() {
std::free(this->cache);
}
const Entry *GetEntry(u32 entry_offset) {
this->ReloadCache(this->GetCacheIndex(entry_offset));
const size_t ofs = entry_offset % MaxCachedSize;
const Entry *entry = reinterpret_cast<const Entry *>(reinterpret_cast<uintptr_t>(this->cache) + ofs);
if (AMS_UNLIKELY(this->GetCacheIndex(entry_offset) != this->GetCacheIndex(entry_offset + sizeof(Entry) + entry->name_size + sizeof(u32)))) {
this->Read(entry_offset, this->fallback_cache, std::min(this->size - entry_offset, FallbackCacheSize));
entry = reinterpret_cast<const Entry *>(this->fallback_cache);
}
return entry;
}
};
template<typename Entry>
class TableWriter {
NON_COPYABLE(TableWriter);
NON_MOVEABLE(TableWriter);
private:
static constexpr size_t MaxCachedSize = (1_MB / 4);
static constexpr size_t FallbackCacheSize = 1_KB;
private:
::FsFile *file;
size_t offset;
size_t size;
size_t cache_idx;
void *cache;
u8 fallback_cache[FallbackCacheSize];
size_t fallback_cache_entry_offset;
size_t fallback_cache_entry_size;
bool cache_dirty;
bool fallback_cache_dirty;
private:
ALWAYS_INLINE void Read(size_t ofs, void *dst, size_t sz) {
u64 read_size;
R_ABORT_UNLESS(fsFileRead(this->file, this->offset + ofs, dst, sz, 0, &read_size));
AMS_ABORT_UNLESS(read_size == sz);
}
ALWAYS_INLINE void Write(size_t ofs, const void *src, size_t sz) {
R_ABORT_UNLESS(fsFileWrite(this->file, this->offset + ofs, src, sz, FsWriteOption_None));
}
ALWAYS_INLINE void Flush() {
AMS_ABORT_UNLESS(!(this->cache_dirty && this->fallback_cache_dirty));
if (this->cache_dirty) {
const size_t ofs = this->cache_idx * MaxCachedSize;
this->Write(ofs, this->cache, std::min(this->size - ofs, MaxCachedSize));
this->cache_dirty = false;
}
if (this->fallback_cache_dirty) {
this->Write(this->fallback_cache_entry_offset, this->fallback_cache, this->fallback_cache_entry_size);
this->fallback_cache_dirty = false;
}
}
ALWAYS_INLINE size_t GetCacheIndex(u32 ofs) {
return ofs / MaxCachedSize;
}
ALWAYS_INLINE void RefreshCacheImpl() {
const size_t cur_cache = this->cache_idx * MaxCachedSize;
this->Read(cur_cache, this->cache, std::min(this->size - cur_cache, MaxCachedSize));
}
ALWAYS_INLINE void RefreshCache(u32 entry_offset) {
if (size_t idx = this->GetCacheIndex(entry_offset); idx != this->cache_idx || this->fallback_cache_dirty) {
this->Flush();
this->cache_idx = idx;
this->RefreshCacheImpl();
}
}
public:
TableWriter(::FsFile *f, size_t ofs, size_t sz) : file(f), offset(ofs), size(sz), cache_idx(0), fallback_cache_entry_offset(), fallback_cache_entry_size(), cache_dirty(), fallback_cache_dirty() {
const size_t cache_size = std::min(sz, MaxCachedSize);
this->cache = std::malloc(cache_size);
AMS_ABORT_UNLESS(this->cache != nullptr);
std::memset(this->cache, 0, cache_size);
std::memset(this->fallback_cache, 0, sizeof(this->fallback_cache));
for (size_t cur = 0; cur < this->size; cur += MaxCachedSize) {
this->Write(cur, this->cache, std::min(this->size - cur, MaxCachedSize));
}
}
~TableWriter() {
this->Flush();
}
Entry *GetEntry(u32 entry_offset, u32 name_len) {
this->RefreshCache(entry_offset);
const size_t ofs = entry_offset % MaxCachedSize;
Entry *entry = reinterpret_cast<Entry *>(reinterpret_cast<uintptr_t>(this->cache) + ofs);
if (ofs + sizeof(Entry) + util::AlignUp(name_len, sizeof(u32)) > MaxCachedSize) {
this->Flush();
this->fallback_cache_entry_offset = entry_offset;
this->fallback_cache_entry_size = sizeof(Entry) + util::AlignUp(name_len, sizeof(u32));
this->Read(this->fallback_cache_entry_offset, this->fallback_cache, this->fallback_cache_entry_size);
entry = reinterpret_cast<Entry *>(this->fallback_cache);
this->fallback_cache_dirty = true;
} else {
this->cache_dirty = true;
}
return entry;
}
};
using DirectoryTableWriter = TableWriter<DirectoryEntry>;
using FileTableWriter = TableWriter<FileEntry>;
constexpr inline const FileEntry *GetFileEntry(const void *file_table, u32 offset) {
return reinterpret_cast<const FileEntry *>(reinterpret_cast<uintptr_t>(file_table) + offset);
}
constexpr inline u32 CalculatePathHash(u32 parent, const char *_path, u32 start, size_t path_len) {
const unsigned char *path = reinterpret_cast<const unsigned char *>(_path);
@ -214,34 +360,45 @@ namespace ams::mitm::fs {
}
void Builder::VisitDirectory(BuildDirectoryContext *parent, u32 parent_offset, const void *dir_table, size_t dir_table_size, const void *file_table, size_t file_table_size) {
const DirectoryEntry *parent_entry = GetDirectoryEntry(dir_table, parent_offset);
if (parent_entry->file != EmptyEntry) {
const FileEntry *cur_file = GetFileEntry(file_table, parent_entry->file);
while (true) {
this->AddFile(parent, std::make_unique<BuildFileContext>(cur_file->name, cur_file->name_size, cur_file->size, cur_file->offset, this->cur_source_type));
if (cur_file->sibling == EmptyEntry) {
break;
}
cur_file = GetFileEntry(file_table, cur_file->sibling);
}
class DirectoryTableReader : public TableReader<DirectoryEntry> {
public:
DirectoryTableReader(ams::fs::IStorage *s, size_t ofs, size_t sz) : TableReader(s, ofs, sz) { /* ... */ }
};
class FileTableReader : public TableReader<FileEntry> {
public:
FileTableReader(ams::fs::IStorage *s, size_t ofs, size_t sz) : TableReader(s, ofs, sz) { /* ... */ }
};
void Builder::VisitDirectory(BuildDirectoryContext *parent, u32 parent_offset, DirectoryTableReader &dir_table, FileTableReader &file_table) {
const DirectoryEntry *parent_entry = dir_table.GetEntry(parent_offset);
u32 cur_file_offset = parent_entry->file;
while (cur_file_offset != EmptyEntry) {
const FileEntry *cur_file = file_table.GetEntry(cur_file_offset);
this->AddFile(parent, std::make_unique<BuildFileContext>(cur_file->name, cur_file->name_size, cur_file->size, cur_file->offset, this->cur_source_type));
cur_file_offset = cur_file->sibling;
}
if (parent_entry->child != EmptyEntry) {
const DirectoryEntry *cur_child = GetDirectoryEntry(dir_table, parent_entry->child);
u32 cur_child_offset = parent_entry->child;
while (true) {
BuildDirectoryContext *real_child = nullptr;
u32 cur_child_offset = parent_entry->child;
while (cur_child_offset != EmptyEntry) {
BuildDirectoryContext *real_child = nullptr;
u32 next_child_offset = 0;
{
const DirectoryEntry *cur_child = dir_table.GetEntry(cur_child_offset);
this->AddDirectory(&real_child, parent, std::make_unique<BuildDirectoryContext>(cur_child->name, cur_child->name_size));
AMS_ABORT_UNLESS(real_child != nullptr);
this->VisitDirectory(real_child, cur_child_offset, dir_table, dir_table_size, file_table, file_table_size);
if (cur_child->sibling == EmptyEntry) {
break;
}
cur_child_offset = cur_child->sibling;
cur_child = GetDirectoryEntry(dir_table, cur_child_offset);
next_child_offset = cur_child->sibling;
__asm__ __volatile__("" ::: "memory");
}
this->VisitDirectory(real_child, cur_child_offset, dir_table, file_table);
cur_child_offset = next_child_offset;
}
}
@ -271,15 +428,11 @@ namespace ams::mitm::fs {
AMS_ABORT_UNLESS(header.header_size == sizeof(Header));
/* Read tables. */
void *tables = std::malloc(header.dir_table_size + header.file_table_size);
ON_SCOPE_EXIT { std::free(tables); };
void *dir_table = tables;
void *file_table = reinterpret_cast<void *>(reinterpret_cast<uintptr_t>(tables) + header.dir_table_size);
R_ABORT_UNLESS(storage->Read(header.dir_table_ofs, dir_table, size_t(header.dir_table_size)));
R_ABORT_UNLESS(storage->Read(header.file_table_ofs, file_table, size_t(header.file_table_size)));
DirectoryTableReader dir_table(storage, header.dir_table_ofs, header.dir_table_size);
FileTableReader file_table(storage, header.file_table_ofs, header.file_table_size);
this->cur_source_type = source_type;
this->VisitDirectory(this->root, 0x0, dir_table, size_t(header.dir_table_size), file_table, size_t(header.file_table_size));
this->VisitDirectory(this->root, 0x0, dir_table, file_table);
}
void Builder::Build(std::vector<SourceInfo> *out_infos) {
@ -372,108 +525,114 @@ namespace ams::mitm::fs {
/* Populate file tables. */
{
void *ft_buf = std::malloc(this->file_table_size);
/* Allocate the hash table. */
void *fht_buf = std::malloc(this->file_hash_table_size);
ON_SCOPE_EXIT { std::free(fht_buf); std::free(ft_buf); };
AMS_ABORT_UNLESS(fht_buf != nullptr);
u32 *file_hash_table = reinterpret_cast<u32 *>(fht_buf);
FileEntry *file_table = reinterpret_cast<FileEntry *>(ft_buf);
std::memset(file_hash_table, 0xFF, this->file_hash_table_size);
ON_SCOPE_EXIT {
R_ABORT_UNLESS(fsFileWrite(&metadata_file, this->dir_hash_table_size + this->dir_table_size, file_hash_table, this->file_hash_table_size, FsWriteOption_None));
std::free(fht_buf);
};
for (const auto &it : this->files) {
BuildFileContext *cur_file = it.get();
FileEntry *cur_entry = GetFileEntry(file_table, cur_file->entry_offset);
/* Write the file table. */
{
FileTableWriter file_table(&metadata_file, this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size, this->file_table_size);
/* Set entry fields. */
cur_entry->parent = cur_file->parent->entry_offset;
cur_entry->sibling = (cur_file->sibling == nullptr) ? EmptyEntry : cur_file->sibling->entry_offset;
cur_entry->offset = cur_file->offset;
cur_entry->size = cur_file->size;
for (const auto &it : this->files) {
BuildFileContext *cur_file = it.get();
FileEntry *cur_entry = file_table.GetEntry(cur_file->entry_offset, cur_file->path_len);
/* Insert into hash table. */
const u32 name_size = cur_file->path_len;
const size_t hash_ind = CalculatePathHash(cur_entry->parent, cur_file->path.get(), 0, name_size) % num_file_hash_table_entries;
cur_entry->hash = file_hash_table[hash_ind];
file_hash_table[hash_ind] = cur_file->entry_offset;
/* Set entry fields. */
cur_entry->parent = cur_file->parent->entry_offset;
cur_entry->sibling = (cur_file->sibling == nullptr) ? EmptyEntry : cur_file->sibling->entry_offset;
cur_entry->offset = cur_file->offset;
cur_entry->size = cur_file->size;
/* Set name. */
cur_entry->name_size = name_size;
if (name_size) {
std::memcpy(cur_entry->name, cur_file->path.get(), name_size);
for (size_t i = name_size; i < util::AlignUp(name_size, 4); i++) {
cur_entry->name[i] = 0;
/* Insert into hash table. */
const u32 name_size = cur_file->path_len;
const size_t hash_ind = CalculatePathHash(cur_entry->parent, cur_file->path.get(), 0, name_size) % num_file_hash_table_entries;
cur_entry->hash = file_hash_table[hash_ind];
file_hash_table[hash_ind] = cur_file->entry_offset;
/* Set name. */
cur_entry->name_size = name_size;
if (name_size) {
std::memcpy(cur_entry->name, cur_file->path.get(), name_size);
for (size_t i = name_size; i < util::AlignUp(name_size, 4); i++) {
cur_entry->name[i] = 0;
}
}
/* Emplace a source. */
switch (cur_file->source_type) {
case DataSourceType::Storage:
case DataSourceType::File:
{
/* Try to compact if possible. */
auto &back = out_infos->back();
if (back.source_type == cur_file->source_type) {
back.size = cur_file->offset + FilePartitionOffset + cur_file->size - back.virtual_offset;
} else {
out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, cur_file->orig_offset + FilePartitionOffset);
}
}
break;
case DataSourceType::LooseSdFile:
{
char *new_path = new char[cur_file->GetPathLength() + 1];
cur_file->GetPath(new_path);
out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, new_path);
}
break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
/* Emplace a source. */
switch (cur_file->source_type) {
case DataSourceType::Storage:
case DataSourceType::File:
{
/* Try to compact if possible. */
auto &back = out_infos->back();
if (back.source_type == cur_file->source_type) {
back.size = cur_file->offset + FilePartitionOffset + cur_file->size - back.virtual_offset;
} else {
out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, cur_file->orig_offset + FilePartitionOffset);
}
}
break;
case DataSourceType::LooseSdFile:
{
char *new_path = new char[cur_file->GetPathLength() + 1];
cur_file->GetPath(new_path);
out_infos->emplace_back(cur_file->offset + FilePartitionOffset, cur_file->size, cur_file->source_type, new_path);
}
break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
/* Write to file. */
R_ABORT_UNLESS(fsFileWrite(&metadata_file, this->dir_hash_table_size + this->dir_table_size, file_hash_table, this->file_hash_table_size, FsWriteOption_None));
R_ABORT_UNLESS(fsFileWrite(&metadata_file, this->dir_hash_table_size + this->dir_table_size + this->file_hash_table_size, file_table, this->file_table_size, FsWriteOption_None));
}
/* Populate directory tables. */
{
void *dt_buf = std::malloc(this->dir_table_size);
/* Allocate the hash table. */
void *dht_buf = std::malloc(this->dir_hash_table_size);
ON_SCOPE_EXIT { std::free(dht_buf); std::free(dt_buf); };
AMS_ABORT_UNLESS(dht_buf != nullptr);
u32 *dir_hash_table = reinterpret_cast<u32 *>(dht_buf);
DirectoryEntry *dir_table = reinterpret_cast<DirectoryEntry *>(dt_buf);
std::memset(dir_hash_table, 0xFF, this->dir_hash_table_size);
ON_SCOPE_EXIT {
R_ABORT_UNLESS(fsFileWrite(&metadata_file, 0, dir_hash_table, this->dir_hash_table_size, FsWriteOption_None));
std::free(dht_buf);
};
for (const auto &it : this->directories) {
BuildDirectoryContext *cur_dir = it.get();
DirectoryEntry *cur_entry = GetDirectoryEntry(dir_table, cur_dir->entry_offset);
/* Write the file table. */
{
DirectoryTableWriter dir_table(&metadata_file, this->dir_hash_table_size, this->dir_table_size);
/* Set entry fields. */
cur_entry->parent = cur_dir == this->root ? 0 : cur_dir->parent->entry_offset;
cur_entry->sibling = (cur_dir->sibling == nullptr) ? EmptyEntry : cur_dir->sibling->entry_offset;
cur_entry->child = (cur_dir->child == nullptr) ? EmptyEntry : cur_dir->child->entry_offset;
cur_entry->file = (cur_dir->file == nullptr) ? EmptyEntry : cur_dir->file->entry_offset;
for (const auto &it : this->directories) {
BuildDirectoryContext *cur_dir = it.get();
DirectoryEntry *cur_entry = dir_table.GetEntry(cur_dir->entry_offset, cur_dir->path_len);
/* Insert into hash table. */
const u32 name_size = cur_dir->path_len;
const size_t hash_ind = CalculatePathHash(cur_entry->parent, cur_dir->path.get(), 0, name_size) % num_dir_hash_table_entries;
cur_entry->hash = dir_hash_table[hash_ind];
dir_hash_table[hash_ind] = cur_dir->entry_offset;
/* Set entry fields. */
cur_entry->parent = cur_dir == this->root ? 0 : cur_dir->parent->entry_offset;
cur_entry->sibling = (cur_dir->sibling == nullptr) ? EmptyEntry : cur_dir->sibling->entry_offset;
cur_entry->child = (cur_dir->child == nullptr) ? EmptyEntry : cur_dir->child->entry_offset;
cur_entry->file = (cur_dir->file == nullptr) ? EmptyEntry : cur_dir->file->entry_offset;
/* Set name. */
cur_entry->name_size = name_size;
if (name_size) {
std::memcpy(cur_entry->name, cur_dir->path.get(), name_size);
for (size_t i = name_size; i < util::AlignUp(name_size, 4); i++) {
cur_entry->name[i] = 0;
/* Insert into hash table. */
const u32 name_size = cur_dir->path_len;
const size_t hash_ind = CalculatePathHash(cur_entry->parent, cur_dir->path.get(), 0, name_size) % num_dir_hash_table_entries;
cur_entry->hash = dir_hash_table[hash_ind];
dir_hash_table[hash_ind] = cur_dir->entry_offset;
/* Set name. */
cur_entry->name_size = name_size;
if (name_size) {
std::memcpy(cur_entry->name, cur_dir->path.get(), name_size);
for (size_t i = name_size; i < util::AlignUp(name_size, 4); i++) {
cur_entry->name[i] = 0;
}
}
}
}
/* Write to file. */
R_ABORT_UNLESS(fsFileWrite(&metadata_file, 0, dir_hash_table, this->dir_hash_table_size, FsWriteOption_None));
R_ABORT_UNLESS(fsFileWrite(&metadata_file, this->dir_hash_table_size, dir_table, this->dir_table_size, FsWriteOption_None));
}
/* Delete maps. */

5
stratosphere/ams_mitm/source/fs_mitm/fsmitm_romfs.hpp
View file

@ -199,6 +199,9 @@ namespace ams::mitm::fs::romfs {
}
};
class DirectoryTableReader;
class FileTableReader;
struct Builder {
NON_COPYABLE(Builder);
NON_MOVEABLE(Builder);
@ -243,7 +246,7 @@ namespace ams::mitm::fs::romfs {
DataSourceType cur_source_type;
private:
void VisitDirectory(FsFileSystem *fs, BuildDirectoryContext *parent);
void VisitDirectory(BuildDirectoryContext *parent, u32 parent_offset, const void *dir_table, size_t dir_table_size, const void *file_table, size_t file_table_size);
void VisitDirectory(BuildDirectoryContext *parent, u32 parent_offset, DirectoryTableReader &dir_table, FileTableReader &file_table);
void AddDirectory(BuildDirectoryContext **out, BuildDirectoryContext *parent_ctx, std::unique_ptr<BuildDirectoryContext> file_ctx);
void AddFile(BuildDirectoryContext *parent_ctx, std::unique_ptr<BuildFileContext> file_ctx);