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kernel: implement path-based truncate for replay files

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This commit is contained in:
overlordxrz-source
2026-10-16 01:27:53 +02:00
committed by nmzik
parent cbe5b62947
commit 56d3ce98f0
4 changed files with 124 additions and 0 deletions
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tests/KernelFileSystemTests.cpp
+61
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@@ -332,6 +332,60 @@ void TestSaveOpenVisibility() {
Check(FileSystem::KernelClose(truncated) == OK, "close truncated save file");
}
void TestSaveTruncate() {
namespace Kernel = Libs::LibKernel;
Loader::SymbolDatabase symbols;
Libs::InitLibKernel_1(&symbols);
const auto* symbol = symbols.Find(
{"WlyEA-sLDf0", "libkernel", 1, "libkernel", 1, 1, Loader::SymbolType::Func});
Check(symbol != nullptr, "sceKernelTruncate export resolves");
const auto truncate =
reinterpret_cast<int (KYTY_SYSV_ABI *)(const char*, int64_t)>(symbol->vaddr);
constexpr char Path[] = "/savedata0/truncate-save.dat";
constexpr char Payload[] = "profile data";
const int fd = FileSystem::KernelOpen(Path, 0x602, 0777);
Check(fd >= 3 && FileSystem::KernelWrite(fd, Payload, sizeof(Payload) - 1) ==
sizeof(Payload) - 1,
"populate path truncation fixture");
FileSystem::FileStat stat {};
std::array<char, 8> bytes {};
Check(truncate(Path, 3) == OK &&
FileSystem::KernelFstat(fd, &stat) == OK && stat.st_size == 3 &&
FileSystem::KernelLseek(fd, 0, 1) == sizeof(Payload) - 1 &&
FileSystem::KernelPread(fd, bytes.data(), bytes.size(), 0) == 3 &&
std::memcmp(bytes.data(), Payload, 3) == 0,
"path truncate discards the tail without moving an open descriptor");
bytes.fill('x');
Check(truncate(Path, bytes.size()) == OK &&
FileSystem::KernelFstat(fd, &stat) == OK && stat.st_size == bytes.size() &&
FileSystem::KernelPread(fd, bytes.data(), bytes.size(), 0) == bytes.size() &&
std::memcmp(bytes.data(), Payload, 3) == 0 &&
std::all_of(bytes.begin() + 3, bytes.end(), [](char byte) { return byte == 0; }) &&
FileSystem::KernelLseek(fd, 0, 1) == sizeof(Payload) - 1,
"path truncate extends with zero bytes and preserves the descriptor position");
Check(truncate(Path, -1) == Kernel::KERNEL_ERROR_EINVAL &&
truncate(nullptr, 0) == Kernel::KERNEL_ERROR_EFAULT &&
truncate("truncate-save.dat", 0) == Kernel::KERNEL_ERROR_EINVAL &&
truncate("/savedata0/missing-save.dat", 0) == Kernel::KERNEL_ERROR_ENOENT &&
truncate("/savedata0", 0) == Kernel::KERNEL_ERROR_EISDIR &&
truncate("/savedata0/truncate-save.dat/child", 0) == Kernel::KERNEL_ERROR_ENOTDIR &&
FileSystem::KernelFstat(fd, &stat) == OK && stat.st_size == bytes.size() &&
FileSystem::KernelLseek(fd, 0, 1) == sizeof(Payload) - 1,
"path truncate errors preserve file size and descriptor position");
Check(truncate("/dev/urandom", 0) == OK,
"path truncate is a no-op for a nonregular nondirectory file");
std::string long_path = "/savedata0";
long_path.resize(1024, '/');
Check(truncate(long_path.c_str(), 0) == Kernel::KERNEL_ERROR_ENAMETOOLONG,
"path truncate rejects a pathname beyond the guest length limit");
long_path.pop_back();
Check(truncate(long_path.c_str(), 0) == Kernel::KERNEL_ERROR_EISDIR &&
truncate((std::string("/savedata0/") + std::string(256, 'a')).c_str(), 0) ==
Kernel::KERNEL_ERROR_ENAMETOOLONG,
"path truncate permits the pathname length limit and bounds each component");
Check(FileSystem::KernelClose(fd) == OK, "close path truncation fixture");
}
void TestAioBatches() {
namespace Kernel = Libs::LibKernel;
Loader::SymbolDatabase symbols;
@@ -699,6 +753,12 @@ void CheckArchiveMount(const std::filesystem::path &root) {
FileSystem::KernelFtruncate(fd, 0) ==
Libs::LibKernel::KERNEL_ERROR_EBADF,
"archive read-only descriptors reject write and truncate");
Check(FileSystem::KernelTruncate(GuestMember, 0) ==
Libs::LibKernel::KERNEL_ERROR_EROFS &&
FileSystem::KernelFstat(fd, &descriptor_stat) == OK &&
descriptor_stat.st_size == payload.size() &&
FileSystem::KernelLseek(fd, 0, 1) == payload.size(),
"path truncate rejects a read-only archive and preserves its member");
const auto unicode_guest = std::string("/app0/") + std::string(ArchiveTests::UnicodeFilename);
const int unicode = FileSystem::KernelOpen(unicode_guest.c_str(), 0, 0);
@@ -1908,6 +1968,7 @@ int main(int, char**) {
CheckAprPaths(temporary.Path());
FileSystem::Mount(temporary.Path(), "/savedata0");
TestSaveOpenVisibility();
TestSaveTruncate();
TestAioBatches();
CheckSaveRename(temporary.Path(), "first-save");
CheckSaveRename(temporary.Path(), "replacement-save");