[Qemu-block] [PATCH 2/2] iotests: test big qcow2 shrink

[Vladimir Sementsov-Ogievskiy]

Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
 tests/qemu-iotests/249     | 69 ++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/249.out | 30 +++++++++++++++++
 tests/qemu-iotests/group   |  1 +
 3 files changed, 100 insertions(+)
 create mode 100755 tests/qemu-iotests/249
 create mode 100644 tests/qemu-iotests/249.out

diff --git a/tests/qemu-iotests/249 b/tests/qemu-iotests/249
new file mode 100755
index 0000000000..f0140461ad
--- /dev/null
+++ b/tests/qemu-iotests/249
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+#
+# Test big discard in qcow2 shrink
+#
+# Copyright (c) 2019 Virtuozzo International GmbH. All rights reserved.
+#
+# 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/>.
+#
+
+# creator
address@hidden
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+status=1       # failure is the default!
+
+_cleanup()
+{
+    _cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+# Requires backing files and .bdrv_change_backing_file support
+_supported_fmt qcow2
+_supported_proto file
+_supported_os Linux
+
+# This test checks bug in qcow2_process_discards, fixed by previous commit.
+# The problem was that bdrv_pdiscard was called with uint64_t bytes parameter
+# which was cropped to int.
+# To reproduce bug we need to overflow int by one sequential discard, so we
+# need size > 2G, bigger cluster size (as with default 64k we may have maximum
+# of 512M sequential data, corresponding to one L1 entry, and we need to write
+# at offset 0 at last, to prevent bdrv_co_truncate(bs->file) in
+# qcow2_co_truncate to stole the whole effect of failed discard.
+
+size=2300M
+IMGOPTS="cluster_size=1M"
+
+_make_test_img $size
+$QEMU_IO -c 'write 100M 2000M' -c 'write 2100M 200M' \
+    -c 'write 0 100M' "$TEST_IMG" | _filter_qemu_io
+
+$QEMU_IMG info "$TEST_IMG" | _filter_testdir
+
+$QEMU_IMG resize --shrink "$TEST_IMG" 50M
+
+$QEMU_IMG info "$TEST_IMG" | _filter_testdir
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0
diff --git a/tests/qemu-iotests/249.out b/tests/qemu-iotests/249.out
new file mode 100644
index 0000000000..18bf7b2fb2
--- /dev/null
+++ b/tests/qemu-iotests/249.out
@@ -0,0 +1,30 @@
+QA output created by 249
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=2411724800
+wrote 2097152000/2097152000 bytes at offset 104857600
+1.953 GiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 209715200/209715200 bytes at offset 2202009600
+200 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+wrote 104857600/104857600 bytes at offset 0
+100 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+image: TEST_DIR/t.qcow2
+file format: qcow2
+virtual size: 2.2G (2411724800 bytes)
+disk size: 2.3G
+cluster_size: 1048576
+Format specific information:
+    compat: 1.1
+    lazy refcounts: false
+    refcount bits: 16
+    corrupt: false
+Image resized.
+image: TEST_DIR/t.qcow2
+file format: qcow2
+virtual size: 50M (52428800 bytes)
+disk size: 54M
+cluster_size: 1048576
+Format specific information:
+    compat: 1.1
+    lazy refcounts: false
+    refcount bits: 16
+    corrupt: false
+*** done
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index bae7718380..3a40dbfe69 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -248,3 +248,4 @@
 246 rw auto quick
 247 rw auto quick
 248 rw auto quick
+249 rw auto
-- 
2.18.0