[PATCH pynfs 09/13] server41tests: test COPY within same file

Add testCopyToSameFile (COPY11) which writes 4KB at offset 0, copies
it to offset 8192 within the same file, and verifies the data at the
destination offset matches the source.

Signed-off-by: Jeff Layton <[email protected]>
---
 nfs4.1/server41tests/st_copy.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/nfs4.1/server41tests/st_copy.py b/nfs4.1/server41tests/st_copy.py
index bec92e8d86b2..1a392f9377b8 100644
--- a/nfs4.1/server41tests/st_copy.py
+++ b/nfs4.1/server41tests/st_copy.py
@@ -300,3 +300,26 @@ def testOffloadStatusNoState(t, env):
     ops = [op.putfh(src_fh), op.offload_status(_bad_stateid())]
     res = sess.compound(ops)
     check(res, NFS4ERR_BAD_STATEID, msg="OFFLOAD_STATUS with bad stateid")
+
+def testCopyToSameFile(t, env):
+    """copy within the same file to non-overlapping region
+
+    FLAGS: copy
+    CODE: COPY11
+    """
+    sess = env.c1.new_client_session(env.testname(t))
+    fh, stateid = _create_and_open(sess, env.testname(t))
+    data = b"F" * 4096
+    write_file(sess, fh, data, 0, stateid)
+
+    res = _do_copy(sess, fh, stateid, fh, stateid,
+                   src_offset=0, dst_offset=8192, count=4096, synchronous=1)
+    check(res)
+    cr = res.resarray[-1]
+    if cr.cr_response.wr_count != 4096:
+        fail("Expected to copy 4096 bytes, got %d" % cr.cr_response.wr_count)
+
+    res = read_file(sess, fh, 8192, 4096, stateid)
+    check(res)
+    if res.data != data:
+        fail("Same-file copy: data at offset 8192 does not match source")

-- 
2.55.0