99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
#include "../../testutils/FuseTest.h"
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#include <condition_variable>
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using ::testing::_;
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using ::testing::StrEq;
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using ::testing::Eq;
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using ::testing::WithParamInterface;
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using ::testing::Values;
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using ::testing::Return;
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using ::testing::Invoke;
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using ::testing::InSequence;
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using ::testing::AtLeast;
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using std::string;
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using std::mutex;
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using std::unique_lock;
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using std::condition_variable;
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using std::chrono::duration;
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using std::chrono::seconds;
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// The fuse behaviour is: For each open(), there will be exactly one call to release().
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// Directly before this call to release(), flush() will be called. After flush() returns,
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// the ::close() syscall (in the process using the filesystem) returns. So the fuse release() call is
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// called asynchronously afterwards. Errors have to be returned in the implementation of flush().
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// Citing FUSE spec:
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// 1) Flush is called on each close() of a file descriptor.
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// 2) Filesystems shouldn't assume that flush will always be called after some writes, or that if will be called at all.
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// I can't get these sentences together. For the test cases here, I go with the first one and assume that
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// flush() will ALWAYS be called on a file close.
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class Barrier {
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public:
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template<class A, class B>
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void WaitAtMost(const duration<A, B> &atMost) {
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unique_lock<mutex> lock(m);
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if (!finished) {
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cv.wait_for(lock, atMost, [this] () {return finished;});
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}
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}
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void Release() {
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unique_lock<mutex> lock(m);
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finished = true;
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cv.notify_all();
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}
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private:
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mutex m;
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condition_variable cv;
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bool finished = false;
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};
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class FuseCloseTest: public FuseTest, public WithParamInterface<int> {
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public:
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const string FILENAME = "/myfile";
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void OpenAndCloseFile(const string &filename) {
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auto fs = TestFS();
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int fd = OpenFile(fs.get(), filename);
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CloseFile(fd);
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}
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int OpenFile(const TempTestFS *fs, const string &filename) {
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auto real_path = fs->mountDir() / filename;
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int fd = ::open(real_path.c_str(), O_RDONLY);
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EXPECT_GE(fd, 0) << "Opening file failed";
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return fd;
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}
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void CloseFile(int fd) {
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int retval = ::close(fd);
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EXPECT_EQ(0, retval);
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}
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};
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INSTANTIATE_TEST_CASE_P(FuseCloseTest, FuseCloseTest, Values(0, 1, 2, 100, 1024*1024*1024));
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//TODO Figure out what's wrong and enable this test
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//Disabled, because it is flaky. libfuse seems to not send the release() event sometimes.
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TEST_P(FuseCloseTest, DISABLED_CloseFile) {
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Barrier barrier;
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ReturnIsFileOnLstat(FILENAME);
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EXPECT_CALL(fsimpl, openFile(StrEq(FILENAME), _)).WillOnce(Return(GetParam()));
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{
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//InSequence fileCloseSequence;
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EXPECT_CALL(fsimpl, flush(Eq(GetParam()))).Times(1);
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EXPECT_CALL(fsimpl, closeFile(Eq(GetParam()))).Times(1).WillOnce(Invoke([&barrier] (int) {
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// Release the waiting lock at the end of this test case, because the fuse release() came in now.
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printf("RELEASING\n");fflush(stdout);
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barrier.Release();
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}));
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}
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OpenAndCloseFile(FILENAME);
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// Wait, until fuse release() was called, so we can check for the function call expectation.
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barrier.WaitAtMost(seconds(10));
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}
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