[PATCH 6/7] simplebench/bench-backup: add --compressed option

[Vladimir Sementsov-Ogievskiy]

Allow bench compressed backup.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 scripts/simplebench/bench-backup.py    | 55 ++++++++++++++++++--------
 scripts/simplebench/bench_block_job.py | 23 +++++++++++
 2 files changed, 62 insertions(+), 16 deletions(-)

diff --git a/scripts/simplebench/bench-backup.py 
b/scripts/simplebench/bench-backup.py
index 33a1ecfefa..72eae85bb1 100755
--- a/scripts/simplebench/bench-backup.py
+++ b/scripts/simplebench/bench-backup.py
@@ -23,7 +23,7 @@ import json
 
 import simplebench
 from results_to_text import results_to_text
-from bench_block_job import bench_block_copy, drv_file, drv_nbd
+from bench_block_job import bench_block_copy, drv_file, drv_nbd, drv_qcow2
 
 
 def bench_func(env, case):
@@ -37,29 +37,41 @@ def bench_func(env, case):
 def bench(args):
     test_cases = []
 
-    sources = {}
-    targets = {}
-    for d in args.dir:
-        label, path = d.split(':')  # paths with colon not supported
-        sources[label] = drv_file(path + '/test-source')
-        targets[label] = drv_file(path + '/test-target')
+    # paths with colon not supported, so we just split by ':'
+    dirs = dict(d.split(':') for d in args.dir)
 
+    nbd_drv = None
     if args.nbd:
         nbd = args.nbd.split(':')
         host = nbd[0]
         port = '10809' if len(nbd) == 1 else nbd[1]
-        drv = drv_nbd(host, port)
-        sources['nbd'] = drv
-        targets['nbd'] = drv
+        nbd_drv = drv_nbd(host, port)
 
     for t in args.test:
         src, dst = t.split(':')
 
-        test_cases.append({
-            'id': t,
-            'source': sources[src],
-            'target': targets[dst]
-        })
+        if src == 'nbd' and dst == 'nbd':
+            raise ValueError("Can't use 'nbd' label for both src and dst")
+
+        if (src == 'nbd' or dst == 'nbd') and not nbd_drv:
+            raise ValueError("'nbd' label used but --nbd is not given")
+
+        if src == 'nbd':
+            source = nbd_drv
+        else:
+            source = drv_file(dirs[src] + '/test-source')
+
+        if dst == 'nbd':
+            test_cases.append({'id': t, 'source': source, 'target': nbd_drv})
+            continue
+
+        fname = dirs[dst] + '/test-target'
+        if args.compressed:
+            fname += '.qcow2'
+        target = drv_file(fname)
+        if args.compressed:
+            target = drv_qcow2(target)
+        test_cases.append({'id': t, 'source': source, 'target': target})
 
     binaries = []  # list of (<label>, <path>, [<options>])
     for i, q in enumerate(args.env):
@@ -106,6 +118,13 @@ def bench(args):
             elif opt.startswith('max-workers='):
                 x_perf['max-workers'] = int(opt.split('=')[1])
 
+        backup_options = {}
+        if x_perf:
+            backup_options['x-perf'] = x_perf
+
+        if args.compressed:
+            backup_options['compress'] = True
+
         if is_mirror:
             assert not x_perf
             test_envs.append({
@@ -117,7 +136,7 @@ def bench(args):
             test_envs.append({
                 'id': f'backup({label})\n' + '\n'.join(opts),
                 'cmd': 'blockdev-backup',
-                'cmd-options': {'x-perf': x_perf} if x_perf else {},
+                'cmd-options': backup_options,
                 'qemu-binary': path
             })
 
@@ -163,5 +182,9 @@ default port 10809). Use it in tests, label is "nbd"
     p.add_argument('--test', nargs='+', help='''\
 Tests, in form source-dir-label:target-dir-label''',
                    action=ExtendAction)
+    p.add_argument('--compressed', help='''\
+Use compressed backup. It automatically means
+automatically creating qcow2 target with
+lazy_refcounts for each test run''', action='store_true')
 
     bench(p.parse_args())
diff --git a/scripts/simplebench/bench_block_job.py 
b/scripts/simplebench/bench_block_job.py
index 7332845c1c..08f86ed9c1 100755
--- a/scripts/simplebench/bench_block_job.py
+++ b/scripts/simplebench/bench_block_job.py
@@ -21,6 +21,7 @@
 
 import sys
 import os
+import subprocess
 import socket
 import json
 
@@ -77,11 +78,29 @@ def bench_block_job(cmd, cmd_args, qemu_args):
     return {'seconds': (end_ms - start_ms) / 1000000.0}
 
 
+def get_image_size(path):
+    out = subprocess.run(['qemu-img', 'info', '--out=json', path],
+                         stdout=subprocess.PIPE, check=True).stdout
+    return json.loads(out)['virtual-size']
+
+
 # Bench backup or mirror
 def bench_block_copy(qemu_binary, cmd, cmd_options, source, target):
     """Helper to run bench_block_job() for mirror or backup"""
     assert cmd in ('blockdev-backup', 'blockdev-mirror')
 
+    if target['driver'] == 'qcow2':
+        try:
+            os.remove(target['file']['filename'])
+        except OSError:
+            pass
+
+        subprocess.run(['qemu-img', 'create', '-f', 'qcow2',
+                        target['file']['filename'],
+                        str(get_image_size(source['filename']))],
+                       stdout=subprocess.DEVNULL,
+                       stderr=subprocess.DEVNULL, check=True)
+
     source['node-name'] = 'source'
     target['node-name'] = 'target'
 
@@ -106,6 +125,10 @@ def drv_nbd(host, port):
             'server': {'type': 'inet', 'host': host, 'port': port}}
 
 
+def drv_qcow2(file):
+    return {'driver': 'qcow2', 'file': file}
+
+
 if __name__ == '__main__':
     import sys
 
-- 
2.29.2