Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/filemanager/driver/local/fallocate_darwin.go

@@ -0,0 +1,27 @@
+package local
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+func Fallocate(file *os.File, offset int64, length int64) error {
+	var fst syscall.Fstore_t
+
+	fst.Flags = syscall.F_ALLOCATECONTIG
+	fst.Posmode = syscall.F_PREALLOCATE
+	fst.Offset = 0
+	fst.Length = offset + length
+	fst.Bytesalloc = 0
+
+	// Check https://lists.apple.com/archives/darwin-dev/2007/Dec/msg00040.html
+	_, _, err := syscall.Syscall(syscall.SYS_FCNTL, file.Fd(), syscall.F_PREALLOCATE, uintptr(unsafe.Pointer(&fst)))
+	if err != syscall.Errno(0x0) {
+		fst.Flags = syscall.F_ALLOCATEALL
+		// Ignore the return value
+		_, _, _ = syscall.Syscall(syscall.SYS_FCNTL, file.Fd(), syscall.F_PREALLOCATE, uintptr(unsafe.Pointer(&fst)))
+	}
+
+	return syscall.Ftruncate(int(file.Fd()), fst.Length)
+}