fuse_context
void fuse_set_getcontext_func(struct fuse_context *(*func)(void));
struct fuse_context *fuse_get_context(void);
= sizeof(fuse_context) <= REQUEST_THREAD_CONTEXT_FS_DATA_SIZE;
fuse_context* fuseContext = (fuse_context*)context->GetFSData();
fuse_context* context = (fuse_context*)RequestThread::GetCurrentThread()
struct fuse_context*
? (fuse_context*)requestThread->GetContext()->GetFSData()