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From dd504cf4643e80d0b7afe16c82ac247a9e35a4af Mon Sep 17 00:00:00 2001
From: Max Reitz <mreitz@redhat.com>
Date: Mon, 18 Jun 2018 17:24:54 +0200
Subject: [PATCH 06/17] iotests: Repairing error during snapshot deletion

RH-Author: Max Reitz <mreitz@redhat.com>
Message-id: <20180618172454.27434-3-mreitz@redhat.com>
Patchwork-id: 80787
O-Subject: [RHEL-7.6 qemu-kvm PATCH 2/2] iotests: Repairing error during snapshot deletion
Bugzilla: 1527122
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

This adds a test for an I/O error during snapshot deletion, and maybe
more importantly, for how to repair the resulting image.  If the
snapshot has been deleted before the error occurs, the only negative
result will be leaked clusters -- and those should be repairable with
qemu-img check -r leaks.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20180509200059.31125-3-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit b41ad73a3bb972eb43cf52d28669f67ea3fe1762)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

Conflicts:
	tests/qemu-iotests/group
	tests/qemu-iotests/217.out

The error message when a snapshot failed to be deleted is less verbose
(just based on errno instead of a nice Error object).

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 tests/qemu-iotests/217     | 90 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/217.out | 42 ++++++++++++++++++++++
 tests/qemu-iotests/group   |  1 +
 3 files changed, 133 insertions(+)
 create mode 100755 tests/qemu-iotests/217
 create mode 100644 tests/qemu-iotests/217.out

diff --git a/tests/qemu-iotests/217 b/tests/qemu-iotests/217
new file mode 100755
index 0000000..d3ab5d7
--- /dev/null
+++ b/tests/qemu-iotests/217
@@ -0,0 +1,90 @@
+#!/bin/bash
+#
+# I/O errors when working with internal qcow2 snapshots, and repairing
+# the result
+#
+# Copyright (C) 2018 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+seq=$(basename $0)
+echo "QA output created by $seq"
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+    _cleanup_test_img
+    rm -f "$TEST_DIR/blkdebug.conf"
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# This test is specific to qcow2
+_supported_fmt qcow2
+_supported_proto file
+_supported_os Linux
+
+# This test needs clusters with at least a refcount of 2 so that
+# OFLAG_COPIED is not set.  refcount_bits=1 is therefore unsupported.
+_unsupported_imgopts 'refcount_bits=1[^0-9]'
+
+echo
+echo '=== Simulating an I/O error during snapshot deletion ==='
+echo
+
+_make_test_img 64M
+$QEMU_IO -c 'write 0 64k' "$TEST_IMG" | _filter_qemu_io
+
+# Create the snapshot
+$QEMU_IMG snapshot -c foo "$TEST_IMG"
+
+# Verify the snapshot is there
+echo
+_img_info | grep 'Snapshot list'
+echo '(Snapshot filtered)'
+echo
+
+# Try to delete the snapshot (with an error happening when freeing the
+# then leaked clusters)
+cat > "$TEST_DIR/blkdebug.conf" <<EOF
+[inject-error]
+event = "cluster_free"
+errno = "5"
+EOF
+$QEMU_IMG snapshot -d foo "blkdebug:$TEST_DIR/blkdebug.conf:$TEST_IMG"
+
+# Verify the snapshot is gone
+echo
+_img_info | grep 'Snapshot list'
+
+# Should only show leaks
+echo '--- Checking test image ---'
+_check_test_img
+
+echo
+
+# As there are only leaks, this should be able to fully repair the
+# image
+echo '--- Repairing test image ---'
+_check_test_img -r leaks
+
+
+# success, all done
+echo '*** done'
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/217.out b/tests/qemu-iotests/217.out
new file mode 100644
index 0000000..4b1020b
--- /dev/null
+++ b/tests/qemu-iotests/217.out
@@ -0,0 +1,42 @@
+QA output created by 217
+
+=== Simulating an I/O error during snapshot deletion ===
+
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+wrote 65536/65536 bytes at offset 0
+64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+Snapshot list:
+(Snapshot filtered)
+
+qcow2_free_clusters failed: Input/output error
+qemu-img: Could not delete snapshot 'foo': -5 (Input/output error)
+
+--- Checking test image ---
+Leaked cluster 4 refcount=2 reference=1
+Leaked cluster 5 refcount=2 reference=1
+Leaked cluster 6 refcount=1 reference=0
+Leaked cluster 7 refcount=1 reference=0
+
+4 leaked clusters were found on the image.
+This means waste of disk space, but no harm to data.
+
+--- Repairing test image ---
+Leaked cluster 4 refcount=2 reference=1
+Leaked cluster 5 refcount=2 reference=1
+Leaked cluster 6 refcount=1 reference=0
+Leaked cluster 7 refcount=1 reference=0
+Repairing cluster 4 refcount=2 reference=1
+Repairing cluster 5 refcount=2 reference=1
+Repairing cluster 6 refcount=1 reference=0
+Repairing cluster 7 refcount=1 reference=0
+Repairing OFLAG_COPIED L2 cluster: l1_index=0 l1_entry=40000 refcount=1
+Repairing OFLAG_COPIED data cluster: l2_entry=50000 refcount=1
+The following inconsistencies were found and repaired:
+
+    4 leaked clusters
+    2 corruptions
+
+Double checking the fixed image now...
+No errors were found on the image.
+*** done
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index c1fc89d..8c96d65 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -93,3 +93,4 @@
 121 rw auto
 130 rw auto quick
 135 rw auto
+217 rw auto quick
-- 
1.8.3.1