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authorEric Blake <eblake@redhat.com>2018-07-02 14:14:58 -0500
committerEric Blake <eblake@redhat.com>2018-07-02 19:50:37 -0500
commita1532a225a183c9fa60b9c1e8ac8a00c7771f64d (patch)
tree1b06dcc85fb145d71d5137de8d8999fb6962ccd4 /tests/qemu-iotests/223
parent216ee3657e14013505abe7853cecb632199fb13e (diff)
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iotests: New test 223 for exporting dirty bitmap over NBD
Although this test is NOT a full test of image fleecing (as it intentionally uses just a single block device directly exported over NBD, rather than trying to set up a blockdev-backup job with multiple BDS involved), it DOES prove that qemu as a server is able to properly expose a dirty bitmap over NBD. When coupled with image fleecing, it is then possible for a third-party client to do an incremental backup by using qemu-img map with the x-dirty-bitmap option to learn which parts of the file are dirty (perhaps confusingly, they are the portions mapped as "data":false - which is part of the reason this is still in the x- experimental namespace), along with another normal client (perhaps 'qemu-nbd -c' to expose the server over /dev/nbd0 and then just use normal I/O on that block device) to read the dirty sections. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20180702191458.28741-3-eblake@redhat.com> Tested-by: John Snow <jsnow@redhat.com> Reviewed-by: John Snow <jsnow@redhat.com>
Diffstat (limited to 'tests/qemu-iotests/223')
-rwxr-xr-xtests/qemu-iotests/223138
1 files changed, 138 insertions, 0 deletions
diff --git a/tests/qemu-iotests/223 b/tests/qemu-iotests/223
new file mode 100755
index 0000000..b63b7a4
--- /dev/null
+++ b/tests/qemu-iotests/223
@@ -0,0 +1,138 @@
+#!/bin/bash
+#
+# Test reading dirty bitmap over NBD
+#
+# 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 $seq"
+
+here="$PWD"
+status=1 # failure is the default!
+
+_cleanup()
+{
+ _cleanup_test_img
+ _cleanup_qemu
+ rm -f "$TEST_DIR/nbd"
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.qemu
+
+_supported_fmt qcow2
+_supported_proto file # uses NBD as well
+_supported_os Linux
+
+function do_run_qemu()
+{
+ echo Testing: "$@"
+ $QEMU -nographic -qmp stdio -serial none "$@"
+ echo
+}
+
+function run_qemu()
+{
+ do_run_qemu "$@" 2>&1 | _filter_testdir | _filter_qmp \
+ | _filter_qemu | _filter_imgfmt \
+ | _filter_actual_image_size
+}
+
+echo
+echo "=== Create partially sparse image, then add dirty bitmap ==="
+echo
+
+_make_test_img 4M
+$QEMU_IO -c 'w -P 0x11 1M 2M' "$TEST_IMG" | _filter_qemu_io
+run_qemu <<EOF
+{ "execute": "qmp_capabilities" }
+{ "execute": "blockdev-add",
+ "arguments": {
+ "driver": "$IMGFMT",
+ "node-name": "n",
+ "file": {
+ "driver": "file",
+ "filename": "$TEST_IMG"
+ }
+ }
+}
+{ "execute": "block-dirty-bitmap-add",
+ "arguments": {
+ "node": "n",
+ "name": "b",
+ "persistent": true
+ }
+}
+{ "execute": "quit" }
+EOF
+
+echo
+echo "=== Write part of the file under active bitmap ==="
+echo
+
+$QEMU_IO -c 'w -P 0x22 2M 2M' "$TEST_IMG" | _filter_qemu_io
+
+echo
+echo "=== End dirty bitmap, and start serving image over NBD ==="
+echo
+
+_launch_qemu 2> >(_filter_nbd)
+
+silent=
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"qmp_capabilities"}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"blockdev-add",
+ "arguments":{"driver":"qcow2", "node-name":"n",
+ "file":{"driver":"file", "filename":"'"$TEST_IMG"'"}}}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"x-block-dirty-bitmap-disable",
+ "arguments":{"node":"n", "name":"b"}}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-start",
+ "arguments":{"addr":{"type":"unix",
+ "data":{"path":"'"$TEST_DIR/nbd"'"}}}}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
+ "arguments":{"device":"n"}}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"x-nbd-server-add-bitmap",
+ "arguments":{"name":"n", "bitmap":"b"}}' "return"
+
+echo
+echo "=== Contrast normal status with dirty-bitmap status ==="
+echo
+
+QEMU_IO_OPTIONS=$QEMU_IO_OPTIONS_NO_FMT
+IMG="driver=nbd,export=n,server.type=unix,server.path=$TEST_DIR/nbd"
+$QEMU_IO -r -c 'r -P 0 0 1m' -c 'r -P 0x11 1m 1m' \
+ -c 'r -P 0x22 2m 2m' --image-opts "$IMG" | _filter_qemu_io
+$QEMU_IMG map --output=json --image-opts \
+ "$IMG" | _filter_qemu_img_map
+$QEMU_IMG map --output=json --image-opts \
+ "$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b" | _filter_qemu_img_map
+
+echo
+echo "=== End NBD server ==="
+echo
+
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-remove",
+ "arguments":{"name":"n"}}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-stop"}' "return"
+_send_qemu_cmd $QEMU_HANDLE '{"execute":"quit"}' "return"
+
+# success, all done
+echo '*** done'
+rm -f $seq.full
+status=0