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From 59a0b65ebe7148f5b2b46d9436df93f6fc52db1a Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Mon, 2 Jul 2018 15:40:08 +0200
Subject: [PATCH 184/268] qemu-iotests: Test qcow2 not leaking clusters on
 write error

RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <20180702154008.15533-4-kwolf@redhat.com>
Patchwork-id: 81187
O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 3/3] qemu-iotests: Test qcow2 not leaking clusters on write error
Bugzilla: 1528541
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

This adds a test for a temporary write failure, which simulates the
situation after werror=stop/enospc has stopped the VM. We shouldn't
leave leaked clusters behind in such cases.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit ae376c6255d0eee4b3c4d60acc4679aa99c0d2c8)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 tests/qemu-iotests/026             | 17 +++++++++++++++++
 tests/qemu-iotests/026.out         |  8 ++++++++
 tests/qemu-iotests/026.out.nocache |  8 ++++++++
 3 files changed, 33 insertions(+)

diff --git a/tests/qemu-iotests/026 b/tests/qemu-iotests/026
index 7fadfba..582d254 100755
--- a/tests/qemu-iotests/026
+++ b/tests/qemu-iotests/026
@@ -200,6 +200,23 @@ done
 done
 done
 
+echo
+echo === Avoid cluster leaks after temporary failure ===
+echo
+
+cat > "$TEST_DIR/blkdebug.conf" <<EOF
+[inject-error]
+event = "write_aio"
+errno = "5"
+once = "on"
+EOF
+
+# After the failed first write, do a second write so that the updated refcount
+# block is actually written back
+_make_test_img 64M
+$QEMU_IO -c "write 0 1M" -c "write 0 1M" "$BLKDBG_TEST_IMG" | _filter_qemu_io
+_check_test_img
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
diff --git a/tests/qemu-iotests/026.out b/tests/qemu-iotests/026.out
index 8e89416..dd10a82 100644
--- a/tests/qemu-iotests/026.out
+++ b/tests/qemu-iotests/026.out
@@ -675,4 +675,12 @@ write failed: No space left on device
 
 96 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
+
+=== Avoid cluster leaks after temporary failure ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+write failed: Input/output error
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
 *** done
diff --git a/tests/qemu-iotests/026.out.nocache b/tests/qemu-iotests/026.out.nocache
index 650ccd8..1ca6cda 100644
--- a/tests/qemu-iotests/026.out.nocache
+++ b/tests/qemu-iotests/026.out.nocache
@@ -683,4 +683,12 @@ write failed: No space left on device
 
 96 leaked clusters were found on the image.
 This means waste of disk space, but no harm to data.
+
+=== Avoid cluster leaks after temporary failure ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+write failed: Input/output error
+wrote 1048576/1048576 bytes at offset 0
+1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+No errors were found on the image.
 *** done
-- 
1.8.3.1