1 files changed, 448 insertions, 0 deletions
diff --git a/test/fuse_integration/concurrent_operations_test.go b/test/fuse_integration/concurrent_operations_test.go
new file mode 100644
index 000000000..7a5cdd0d3
--- /dev/null
+++ b/test/fuse_integration/concurrent_operations_test.go
@@ -0,0 +1,448 @@
+package fuse_test
+
+import (
+	"bytes"
+	"crypto/rand"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestConcurrentFileOperations tests concurrent file operations
+func TestConcurrentFileOperations(t *testing.T) {
+	framework := NewFuseTestFramework(t, DefaultTestConfig())
+	defer framework.Cleanup()
+
+	require.NoError(t, framework.Setup(DefaultTestConfig()))
+
+	t.Run("ConcurrentFileWrites", func(t *testing.T) {
+		testConcurrentFileWrites(t, framework)
+	})
+
+	t.Run("ConcurrentFileReads", func(t *testing.T) {
+		testConcurrentFileReads(t, framework)
+	})
+
+	t.Run("ConcurrentReadWrite", func(t *testing.T) {
+		testConcurrentReadWrite(t, framework)
+	})
+
+	t.Run("ConcurrentDirectoryOperations", func(t *testing.T) {
+		testConcurrentDirectoryOperations(t, framework)
+	})
+
+	t.Run("ConcurrentFileCreation", func(t *testing.T) {
+		testConcurrentFileCreation(t, framework)
+	})
+}
+
+// testConcurrentFileWrites tests multiple goroutines writing to different files
+func testConcurrentFileWrites(t *testing.T, framework *FuseTestFramework) {
+	numWorkers := 10
+	filesPerWorker := 5
+	var wg sync.WaitGroup
+	var mutex sync.Mutex
+	errors := make([]error, 0)
+
+	// Function to collect errors safely
+	addError := func(err error) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		errors = append(errors, err)
+	}
+
+	// Start concurrent workers
+	for worker := 0; worker < numWorkers; worker++ {
+		wg.Add(1)
+		go func(workerID int) {
+			defer wg.Done()
+
+			for file := 0; file < filesPerWorker; file++ {
+				filename := fmt.Sprintf("worker_%d_file_%d.txt", workerID, file)
+				content := []byte(fmt.Sprintf("Worker %d, File %d - %s", workerID, file, time.Now().String()))
+
+				mountPath := filepath.Join(framework.GetMountPoint(), filename)
+				if err := os.WriteFile(mountPath, content, 0644); err != nil {
+					addError(fmt.Errorf("worker %d file %d: %v", workerID, file, err))
+					return
+				}
+
+				// Verify file was written correctly
+				readContent, err := os.ReadFile(mountPath)
+				if err != nil {
+					addError(fmt.Errorf("worker %d file %d read: %v", workerID, file, err))
+					return
+				}
+
+				if !bytes.Equal(content, readContent) {
+					addError(fmt.Errorf("worker %d file %d: content mismatch", workerID, file))
+					return
+				}
+			}
+		}(worker)
+	}
+
+	wg.Wait()
+
+	// Check for errors
+	require.Empty(t, errors, "Concurrent writes failed: %v", errors)
+
+	// Verify all files exist and have correct content
+	for worker := 0; worker < numWorkers; worker++ {
+		for file := 0; file < filesPerWorker; file++ {
+			filename := fmt.Sprintf("worker_%d_file_%d.txt", worker, file)
+			framework.AssertFileExists(filename)
+		}
+	}
+}
+
+// testConcurrentFileReads tests multiple goroutines reading from the same file
+func testConcurrentFileReads(t *testing.T, framework *FuseTestFramework) {
+	// Create a test file
+	filename := "concurrent_read_test.txt"
+	testData := make([]byte, 1024*1024) // 1MB
+	_, err := rand.Read(testData)
+	require.NoError(t, err)
+
+	framework.CreateTestFile(filename, testData)
+
+	numReaders := 20
+	var wg sync.WaitGroup
+	var mutex sync.Mutex
+	errors := make([]error, 0)
+
+	addError := func(err error) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		errors = append(errors, err)
+	}
+
+	// Start concurrent readers
+	for reader := 0; reader < numReaders; reader++ {
+		wg.Add(1)
+		go func(readerID int) {
+			defer wg.Done()
+
+			mountPath := filepath.Join(framework.GetMountPoint(), filename)
+
+			// Read multiple times
+			for i := 0; i < 3; i++ {
+				readData, err := os.ReadFile(mountPath)
+				if err != nil {
+					addError(fmt.Errorf("reader %d iteration %d: %v", readerID, i, err))
+					return
+				}
+
+				if !bytes.Equal(testData, readData) {
+					addError(fmt.Errorf("reader %d iteration %d: data mismatch", readerID, i))
+					return
+				}
+			}
+		}(reader)
+	}
+
+	wg.Wait()
+	require.Empty(t, errors, "Concurrent reads failed: %v", errors)
+}
+
+// testConcurrentReadWrite tests simultaneous read and write operations
+func testConcurrentReadWrite(t *testing.T, framework *FuseTestFramework) {
+	filename := "concurrent_rw_test.txt"
+	initialData := bytes.Repeat([]byte("INITIAL"), 1000)
+	framework.CreateTestFile(filename, initialData)
+
+	var wg sync.WaitGroup
+	var mutex sync.Mutex
+	errors := make([]error, 0)
+
+	addError := func(err error) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		errors = append(errors, err)
+	}
+
+	mountPath := filepath.Join(framework.GetMountPoint(), filename)
+
+	// Start readers
+	numReaders := 5
+	for i := 0; i < numReaders; i++ {
+		wg.Add(1)
+		go func(readerID int) {
+			defer wg.Done()
+
+			for j := 0; j < 10; j++ {
+				_, err := os.ReadFile(mountPath)
+				if err != nil {
+					addError(fmt.Errorf("reader %d: %v", readerID, err))
+					return
+				}
+				time.Sleep(10 * time.Millisecond)
+			}
+		}(i)
+	}
+
+	// Start writers
+	numWriters := 2
+	for i := 0; i < numWriters; i++ {
+		wg.Add(1)
+		go func(writerID int) {
+			defer wg.Done()
+
+			for j := 0; j < 5; j++ {
+				newData := bytes.Repeat([]byte(fmt.Sprintf("WRITER%d", writerID)), 1000)
+				err := os.WriteFile(mountPath, newData, 0644)
+				if err != nil {
+					addError(fmt.Errorf("writer %d: %v", writerID, err))
+					return
+				}
+				time.Sleep(50 * time.Millisecond)
+			}
+		}(i)
+	}
+
+	wg.Wait()
+	require.Empty(t, errors, "Concurrent read/write failed: %v", errors)
+
+	// Verify file still exists and is readable
+	framework.AssertFileExists(filename)
+}
+
+// testConcurrentDirectoryOperations tests concurrent directory operations
+func testConcurrentDirectoryOperations(t *testing.T, framework *FuseTestFramework) {
+	numWorkers := 8
+	var wg sync.WaitGroup
+	var mutex sync.Mutex
+	errors := make([]error, 0)
+
+	addError := func(err error) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		errors = append(errors, err)
+	}
+
+	// Each worker creates a directory tree
+	for worker := 0; worker < numWorkers; worker++ {
+		wg.Add(1)
+		go func(workerID int) {
+			defer wg.Done()
+
+			// Create worker directory
+			workerDir := fmt.Sprintf("worker_%d", workerID)
+			mountPath := filepath.Join(framework.GetMountPoint(), workerDir)
+
+			if err := os.Mkdir(mountPath, 0755); err != nil {
+				addError(fmt.Errorf("worker %d mkdir: %v", workerID, err))
+				return
+			}
+
+			// Create subdirectories and files
+			for i := 0; i < 5; i++ {
+				subDir := filepath.Join(mountPath, fmt.Sprintf("subdir_%d", i))
+				if err := os.Mkdir(subDir, 0755); err != nil {
+					addError(fmt.Errorf("worker %d subdir %d: %v", workerID, i, err))
+					return
+				}
+
+				// Create file in subdirectory
+				testFile := filepath.Join(subDir, "test.txt")
+				content := []byte(fmt.Sprintf("Worker %d, Subdir %d", workerID, i))
+				if err := os.WriteFile(testFile, content, 0644); err != nil {
+					addError(fmt.Errorf("worker %d file %d: %v", workerID, i, err))
+					return
+				}
+			}
+		}(worker)
+	}
+
+	wg.Wait()
+	require.Empty(t, errors, "Concurrent directory operations failed: %v", errors)
+
+	// Verify all structures were created
+	for worker := 0; worker < numWorkers; worker++ {
+		workerDir := fmt.Sprintf("worker_%d", worker)
+		mountPath := filepath.Join(framework.GetMountPoint(), workerDir)
+
+		info, err := os.Stat(mountPath)
+		require.NoError(t, err)
+		assert.True(t, info.IsDir())
+
+		// Check subdirectories
+		for i := 0; i < 5; i++ {
+			subDir := filepath.Join(mountPath, fmt.Sprintf("subdir_%d", i))
+			info, err := os.Stat(subDir)
+			require.NoError(t, err)
+			assert.True(t, info.IsDir())
+
+			testFile := filepath.Join(subDir, "test.txt")
+			expectedContent := []byte(fmt.Sprintf("Worker %d, Subdir %d", worker, i))
+			actualContent, err := os.ReadFile(testFile)
+			require.NoError(t, err)
+			assert.Equal(t, expectedContent, actualContent)
+		}
+	}
+}
+
+// testConcurrentFileCreation tests concurrent creation of files in same directory
+func testConcurrentFileCreation(t *testing.T, framework *FuseTestFramework) {
+	// Create test directory
+	testDir := "concurrent_creation"
+	framework.CreateTestDir(testDir)
+
+	numWorkers := 15
+	filesPerWorker := 10
+	var wg sync.WaitGroup
+	var mutex sync.Mutex
+	errors := make([]error, 0)
+	createdFiles := make(map[string]bool)
+
+	addError := func(err error) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		errors = append(errors, err)
+	}
+
+	addFile := func(filename string) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		createdFiles[filename] = true
+	}
+
+	// Create files concurrently
+	for worker := 0; worker < numWorkers; worker++ {
+		wg.Add(1)
+		go func(workerID int) {
+			defer wg.Done()
+
+			for file := 0; file < filesPerWorker; file++ {
+				filename := fmt.Sprintf("file_%d_%d.txt", workerID, file)
+				relativePath := filepath.Join(testDir, filename)
+				mountPath := filepath.Join(framework.GetMountPoint(), relativePath)
+
+				content := []byte(fmt.Sprintf("Worker %d, File %d, Time: %s",
+					workerID, file, time.Now().Format(time.RFC3339Nano)))
+
+				if err := os.WriteFile(mountPath, content, 0644); err != nil {
+					addError(fmt.Errorf("worker %d file %d: %v", workerID, file, err))
+					return
+				}
+
+				addFile(filename)
+			}
+		}(worker)
+	}
+
+	wg.Wait()
+	require.Empty(t, errors, "Concurrent file creation failed: %v", errors)
+
+	// Verify all files were created
+	expectedCount := numWorkers * filesPerWorker
+	assert.Equal(t, expectedCount, len(createdFiles))
+
+	// Read directory and verify count
+	mountPath := filepath.Join(framework.GetMountPoint(), testDir)
+	entries, err := os.ReadDir(mountPath)
+	require.NoError(t, err)
+	assert.Equal(t, expectedCount, len(entries))
+
+	// Verify each file exists and has content
+	for filename := range createdFiles {
+		relativePath := filepath.Join(testDir, filename)
+		framework.AssertFileExists(relativePath)
+	}
+}
+
+// TestStressOperations tests high-load scenarios
+func TestStressOperations(t *testing.T) {
+	framework := NewFuseTestFramework(t, DefaultTestConfig())
+	defer framework.Cleanup()
+
+	require.NoError(t, framework.Setup(DefaultTestConfig()))
+
+	t.Run("HighFrequencySmallWrites", func(t *testing.T) {
+		testHighFrequencySmallWrites(t, framework)
+	})
+
+	t.Run("ManySmallFiles", func(t *testing.T) {
+		testManySmallFiles(t, framework)
+	})
+}
+
+// testHighFrequencySmallWrites tests many small writes to the same file
+func testHighFrequencySmallWrites(t *testing.T, framework *FuseTestFramework) {
+	filename := "high_freq_writes.txt"
+	mountPath := filepath.Join(framework.GetMountPoint(), filename)
+
+	// Open file for writing
+	file, err := os.OpenFile(mountPath, os.O_CREATE|os.O_WRONLY, 0644)
+	require.NoError(t, err)
+	defer file.Close()
+
+	// Perform many small writes
+	numWrites := 1000
+	writeSize := 100
+
+	for i := 0; i < numWrites; i++ {
+		data := []byte(fmt.Sprintf("Write %04d: %s\n", i, bytes.Repeat([]byte("x"), writeSize-20)))
+		_, err := file.Write(data)
+		require.NoError(t, err)
+	}
+	file.Close()
+
+	// Verify file size
+	info, err := os.Stat(mountPath)
+	require.NoError(t, err)
+	assert.Equal(t, totalSize, info.Size())
+}
+
+// testManySmallFiles tests creating many small files
+func testManySmallFiles(t *testing.T, framework *FuseTestFramework) {
+	testDir := "many_small_files"
+	framework.CreateTestDir(testDir)
+
+	numFiles := 500
+	var wg sync.WaitGroup
+	var mutex sync.Mutex
+	errors := make([]error, 0)
+
+	addError := func(err error) {
+		mutex.Lock()
+		defer mutex.Unlock()
+		errors = append(errors, err)
+	}
+
+	// Create files in batches
+	batchSize := 50
+	for batch := 0; batch < numFiles/batchSize; batch++ {
+		wg.Add(1)
+		go func(batchID int) {
+			defer wg.Done()
+
+			for i := 0; i < batchSize; i++ {
+				fileNum := batchID*batchSize + i
+				filename := filepath.Join(testDir, fmt.Sprintf("small_file_%04d.txt", fileNum))
+				content := []byte(fmt.Sprintf("File %d content", fileNum))
+
+				mountPath := filepath.Join(framework.GetMountPoint(), filename)
+				if err := os.WriteFile(mountPath, content, 0644); err != nil {
+					addError(fmt.Errorf("file %d: %v", fileNum, err))
+					return
+				}
+			}
+		}(batch)
+	}
+
+	wg.Wait()
+	require.Empty(t, errors, "Many small files creation failed: %v", errors)
+
+	// Verify directory listing
+	mountPath := filepath.Join(framework.GetMountPoint(), testDir)
+	entries, err := os.ReadDir(mountPath)
+	require.NoError(t, err)
+	assert.Equal(t, numFiles, len(entries))
+}