Initial commit

hf3fs_fuse/fuse_demo.py

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+from hf3fs_fuse.io import make_iovec, make_ioring, register_fd, deregister_fd
+from multiprocessing.shared_memory import SharedMemory
+import os
+
+# Create memory for IO
+shm = SharedMemory(size=1024, create=True)
+iov = make_iovec(shm, '/hf3fs-cluster', 0, -1) # shm, mountpoint, blocksize, numa
+shm.unlink() # shm can be unlinked after make_iovec
+
+# Create ioring for IO
+ior = make_ioring('/hf3fs-cluster', 100, True, 0) # mountpoint, num_entries, for_read, io_depth
+
+# Open file
+fd = os.open('/hf3fs-cluster/testread', os.O_RDONLY)
+register_fd(fd) # must register after open to use usrbio
+
+# Read file
+ios = [(iov[:512], fd, 512), (iov[512:], fd, 0)] # iov, fd, offset
+for io in ios:
+    ior.prepare(io[0], True, io[1], io[2], userdata=io) # iov, for_read, fd, offset, userdata
+    # Only for_read == True is allowed, because ior has for_read == True
+    # userdata must be a referenced python object, we reference io in the list ios, so it will not be sent to GC
+resv = ior.submit().wait(min_results=2)
+for res in resv:
+    print(res.result)
+    assert res.result == len(memoryview(res.userdata[0])) # Check read length is correct
+
+# Close file
+deregister_fd(fd) # must deregister before close
+os.close(fd)