[PATCH v3] generic/430: add copy in same file test

["Jianhong.Yin" <yin-jianhong@163.com>]

now xfstests has not cover the senario that copy in same file
related bug:
 copy_file_range return "Invalid argument" when copy in the same file
 https://bugzilla.kernel.org/show_bug.cgi?id=202935

step1:
 copy whole file to itself, and compare with original file.
step2:
 copy whole file to end of itself, and compare the two halves with the original file
step3:
 recover from original file.

Signed-off-by: Jianhong Yin <yin-jianhong@163.com>
---

this is a base function test, I don't think we should add a new
test for it like 553 554, so add it in generic/430
what do you think?

 tests/generic/430     | 12 ++++++++++++
 tests/generic/430.out |  4 ++++
 2 files changed, 16 insertions(+)

diff --git a/tests/generic/430 b/tests/generic/430
index 1b11f60d..4ce0ee26 100755
--- a/tests/generic/430
+++ b/tests/generic/430
@@ -6,6 +6,7 @@
 #
 # Tests vfs_copy_file_range():
 #   - Copy a file
+#   - Copy in same file
 #   - Copy beginning of original to new file
 #   - Copy middle of original to a new file
 #   - Copy end of original to new file
@@ -52,6 +53,17 @@ cmp $testdir/file $testdir/copy
 echo "Original md5sums:"
 md5sum $testdir/{file,copy} | _filter_test_dir
 
+fsize=$(stat -c %s $testdir/copy)
+echo "Copy in same file"
+$XFS_IO_PROG    -c "copy_range -l $fsize $testdir/copy" "$testdir/copy"
+cmp $testdir/file $testdir/copy
+$XFS_IO_PROG    -c "copy_range -l $fsize -d $fsize $testdir/copy" "$testdir/copy"
+cmp -n $fsize $testdir/file $testdir/copy
+cmp -i 0:$fsize $testdir/file $testdir/copy
+$XFS_IO_PROG -f -c "copy_range $testdir/file" "$testdir/copy"
+echo "md5sums after copying in same file and recover:"
+md5sum $testdir/{file,copy} | _filter_test_dir
+
 echo "Copy beginning of original file"
 $XFS_IO_PROG -f -c "copy_range -l 1000 $testdir/file" "$testdir/beginning"
 cmp -n 1000 $testdir/file $testdir/beginning
diff --git a/tests/generic/430.out b/tests/generic/430.out
index 4b4ca75d..57584957 100644
--- a/tests/generic/430.out
+++ b/tests/generic/430.out
@@ -3,6 +3,10 @@ Create the original file and then copy
 Original md5sums:
 e11fbace556cba26bf0076e74cab90a3  TEST_DIR/test-430/file
 e11fbace556cba26bf0076e74cab90a3  TEST_DIR/test-430/copy
+Copy in same file
+md5sums after copying in same file and recover:
+e11fbace556cba26bf0076e74cab90a3  TEST_DIR/test-430/file
+e11fbace556cba26bf0076e74cab90a3  TEST_DIR/test-430/copy
 Copy beginning of original file
 md5sums after copying beginning:
 e11fbace556cba26bf0076e74cab90a3  TEST_DIR/test-430/file
-- 
2.21.0