1 files changed, 190 insertions, 0 deletions
diff --git a/tests/qemu-iotests/020 b/tests/qemu-iotests/020
new file mode 100755
index 000000000..60c672e17
--- /dev/null
+++ b/tests/qemu-iotests/020
@@ -0,0 +1,190 @@
+#!/usr/bin/env bash
+# group: rw backing auto quick
+#
+# Commit changes to backing file
+#
+# Copyright (C) 2009 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/>.
+#
+
+# creator
+owner=kwolf@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+    _cleanup_test_img
+    _rm_test_img "$TEST_IMG.base"
+    _rm_test_img "$TEST_IMG.orig"
+
+    _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.base"
+    _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT.mid"
+    _rm_test_img "$TEST_DIR/subdir/t.$IMGFMT"
+    rmdir "$TEST_DIR/subdir" &> /dev/null
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.pattern
+
+# Any format supporting backing files
+_supported_fmt qcow qcow2 vmdk qed
+_supported_proto file
+_unsupported_imgopts "subformat=monolithicFlat" \
+                     "subformat=twoGbMaxExtentFlat" \
+                     "subformat=twoGbMaxExtentSparse" \
+                     "subformat=streamOptimized"
+
+TEST_OFFSETS="0 4294967296"
+
+TEST_IMG_SAVE="$TEST_IMG"
+TEST_IMG="$TEST_IMG.base"
+
+_make_test_img 6G
+
+echo "Filling base image"
+echo
+
+for offset in $TEST_OFFSETS; do
+    # Some clusters with alternating backing file/image file reads
+    io writev $(( offset )) 512 1024 64
+
+    # Complete backing clusters
+    io writev $(( offset  + 64 * 1024))  65536 65536 1
+done
+_check_test_img
+
+echo "Creating test image with backing file"
+echo
+
+TEST_IMG="$TEST_IMG_SAVE"
+_make_test_img -b "$TEST_IMG.base" -F $IMGFMT 6G
+
+echo "Filling test image"
+echo
+
+for offset in $TEST_OFFSETS; do
+    # Some clusters with alternating backing file/image file reads
+    io writev $(( offset + 512 )) 512 1024 64
+
+    # Complete test image clusters
+    io writev $(( offset + 64 * 1024 + 65536))  65536 65536 1
+done
+_check_test_img
+
+$QEMU_IMG commit "$TEST_IMG"
+TEST_IMG="$TEST_IMG.base"
+
+echo "Reading from the backing file"
+echo
+
+for offset in $TEST_OFFSETS; do
+    # Some clusters with alternating backing file/image file reads
+    io readv $(( offset )) 512 1024 64
+    io readv $(( offset + 512 )) 512 1024 64
+
+    # Complete test image clusters
+    io readv $(( offset  + 64 * 1024))  65536 65536 1
+    io readv $(( offset + 64 * 1024 + 65536))  65536 65536 1
+
+    # Empty sectors
+    io_zero readv $(( offset + 64 * 1024 + 65536 * 4 )) 65536 65536 1
+done
+_check_test_img
+_cleanup
+TEST_IMG=$TEST_IMG_SAVE
+
+echo
+echo 'Testing failing commit'
+echo
+
+TEST_IMG="$TEST_IMG.base" _make_test_img 1M
+
+# Create an image with a null backing file to which committing will fail (with
+# ENOSPC so we can distinguish the result from some generic EIO which may be
+# generated anywhere in the block layer)
+backing="json:{'driver': '$IMGFMT',
+               'file': {
+                   'driver': 'blkdebug',
+                   'inject-error': [{
+                       'event': 'write_aio',
+                       'errno': 28,
+                       'once': true
+                   }],
+                   'image': {
+                       'driver': 'file',
+                       'filename': '$TEST_IMG.base'
+                   }}}"
+
+# Filter out newlines and collapse spaces
+backing=$(echo "$backing" | tr -d '\n' | tr -s ' ')
+
+_make_test_img -b "$backing" -F $IMGFMT
+
+# Just write anything so committing will not be a no-op
+$QEMU_IO -c 'writev 0 64k' "$TEST_IMG" | _filter_qemu_io
+
+$QEMU_IMG commit "$TEST_IMG"
+_cleanup
+
+
+echo
+echo 'Testing commit in sub-directory with relative filenames'
+echo
+
+pushd "$TEST_DIR" > /dev/null
+
+mkdir subdir
+
+TEST_IMG="subdir/t.$IMGFMT.base" _make_test_img 1M
+TEST_IMG="subdir/t.$IMGFMT.mid" _make_test_img -b "t.$IMGFMT.base" -F $IMGFMT
+TEST_IMG="subdir/t.$IMGFMT" _make_test_img -b "t.$IMGFMT.mid" -F $IMGFMT
+
+# Should work
+$QEMU_IMG commit -b "t.$IMGFMT.mid" "subdir/t.$IMGFMT"
+
+# Might theoretically work, but does not in practice (we have to
+# decide between this and the above; and since we always represent
+# backing file names as relative to the overlay, we go for the above)
+$QEMU_IMG commit -b "subdir/t.$IMGFMT.mid" "subdir/t.$IMGFMT" 2>&1 | \
+    _filter_imgfmt
+
+# This should work as well
+$QEMU_IMG commit -b "$TEST_DIR/subdir/t.$IMGFMT.mid" "subdir/t.$IMGFMT"
+
+popd > /dev/null
+
+# Now let's try with just absolute filenames
+# (This will not work with external data files, though, because when
+# using relative paths for those, qemu will always resolve them
+# relative to its CWD.  Therefore, it cannot find those data files now
+# that we left $TEST_DIR.)
+if _get_data_file '' > /dev/null; then
+    echo 'Image committed.' # Skip test
+else
+    $QEMU_IMG commit -b "$TEST_DIR/subdir/t.$IMGFMT.mid" \
+        "$TEST_DIR/subdir/t.$IMGFMT"
+fi
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0