1 files changed, 42 insertions, 0 deletions
diff --git a/qa/workunits/fs/misc/direct_io.py b/qa/workunits/fs/misc/direct_io.py
new file mode 100755
index 000000000..f7d59d95a
--- /dev/null
+++ b/qa/workunits/fs/misc/direct_io.py
@@ -0,0 +1,42 @@
+#!/usr/bin/python3
+
+import mmap
+import os
+import subprocess
+
+def main():
+    path = "testfile"
+    fd = os.open(path, os.O_RDWR | os.O_CREAT | os.O_TRUNC | os.O_DIRECT, 0o644)
+
+    ino = os.fstat(fd).st_ino
+    obj_name = "{ino:x}.00000000".format(ino=ino)
+    pool_name = os.getxattr(path, "ceph.file.layout.pool")
+
+    buf = mmap.mmap(-1, 1)
+    buf.write(b'1')
+    os.write(fd, buf)
+
+    proc = subprocess.Popen(['rados', '-p', pool_name, 'get', obj_name, 'tmpfile'])
+    proc.wait()
+
+    with open('tmpfile', 'rb') as tmpf:
+        out = tmpf.read(1)
+        if out != b'1':
+            raise RuntimeError("data were not written to object store directly")
+
+    with open('tmpfile', 'wb') as tmpf:
+        tmpf.write(b'2')
+
+    proc = subprocess.Popen(['rados', '-p', pool_name, 'put', obj_name, 'tmpfile'])
+    proc.wait()
+
+    os.lseek(fd, 0, os.SEEK_SET)
+    out = os.read(fd, 1)
+    if out != b'2':
+        raise RuntimeError("data were not directly read from object store")
+
+    os.close(fd)
+    print('ok')
+
+
+main()