iotests: Improve and rename test 309 to nbd-qemu-allocation

Enhance the test to inspect what qemu-nbd is advertising during
handshake, and rename it now that we support useful iotest names.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210701190655.2131223-2-eblake@redhat.com>

tests/qemu-iotests/309 → tests/qemu-iotests/tests/nbd-qemu-allocation

@@ -3,7 +3,7 @@
 #
 # Test qemu-nbd -A
 #
-# Copyright (C) 2018-2020 Red Hat, Inc.
+# Copyright (C) 2018-2021 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
@@ -32,6 +32,7 @@ _cleanup()
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 # get standard environment, filters and checks
+cd ..
 . ./common.rc
 . ./common.filter
 . ./common.nbd
@@ -57,6 +58,8 @@ echo
 $QEMU_IMG map --output=json -f qcow2 "$TEST_IMG"
 IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
 nbd_server_start_unix_socket -r -f qcow2 -A "$TEST_IMG"
+# Inspect what the server is exposing
+$QEMU_NBD --list -k $nbd_unix_socket
 # Normal -f raw NBD block status loses access to allocation information
 $QEMU_IMG map --output=json --image-opts \
     "$IMG" | _filter_qemu_img_map

tests/qemu-iotests/309.out → tests/qemu-iotests/tests/nbd-qemu-allocation.out

@@ -1,4 +1,4 @@
-QA output created by 309
+QA output created by nbd-qemu-allocation
 
 === Initial image setup ===
 
@@ -14,6 +14,16 @@ wrote 2097152/2097152 bytes at offset 1048576
 [{ "start": 0, "length": 1048576, "depth": 1, "zero": false, "data": true, "offset": 327680},
 { "start": 1048576, "length": 2097152, "depth": 0, "zero": false, "data": true, "offset": 327680},
 { "start": 3145728, "length": 1048576, "depth": 1, "zero": true, "data": false}]
+exports available: 1
+ export: ''
+  size:  4194304
+  flags: 0x58f ( readonly flush fua df multi cache )
+  min block: 1
+  opt block: 4096
+  max block: 33554432
+  available meta contexts: 2
+   base:allocation
+   qemu:allocation-depth
 [{ "start": 0, "length": 3145728, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
 { "start": 3145728, "length": 1048576, "depth": 0, "zero": true, "data": false, "offset": OFFSET}]
 [{ "start": 0, "length": 1048576, "depth": 0, "zero": true, "data": true, "offset": OFFSET},