#!/usr/bin/env bash
#
# Test reading dirty bitmap over NBD
#
# Copyright (C) 2018-2020 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"

status=1 # failure is the default!

_cleanup()
{
    nbd_server_stop
    _cleanup_test_img
    _cleanup_qemu
    rm -f "$SOCK_DIR/nbd"
}
trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.qemu
. ./common.nbd

_supported_fmt qcow2
_supported_proto file # uses NBD as well
_supported_os Linux
# Persistent dirty bitmaps require compat=1.1
_unsupported_imgopts 'compat=0.10'

do_run_qemu()
{
    echo Testing: "$@"
    $QEMU -nographic -qmp stdio -serial none "$@"
    echo
}

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 bitmaps ==="
echo

# Two bitmaps, to contrast granularity issues
# Also note that b will be disabled, while b2 is left enabled, to
# check for read-only interactions
_make_test_img -o cluster_size=4k 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,
    "granularity": 65536
  }
}
{ "execute": "block-dirty-bitmap-add",
  "arguments": {
    "node": "n",
    "name": "b2",
    "persistent": true,
    "granularity": 512
  }
}
{ "execute": "quit" }
EOF

echo
echo "=== Write part of the file under active bitmap ==="
echo

$QEMU_IO -c 'w -P 0x22 512 512' -c 'w -P 0x33 2M 2M' "$TEST_IMG" \
    | _filter_qemu_io

echo
echo "=== End dirty bitmaps, and start serving image over NBD ==="
echo

_launch_qemu -object iothread,id=io0 2> >(_filter_nbd)

# Intentionally provoke some errors as well, to check error handling
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":"block-dirty-bitmap-disable",
  "arguments":{"node":"n", "name":"b"}}' "return"

for attempt in normal iothread; do

echo
echo "=== Set up NBD with $attempt access ==="
echo
if [ $attempt = iothread ]; then
_send_qemu_cmd $QEMU_HANDLE '{"execute":"x-blockdev-set-iothread",
  "arguments":{"node-name":"n", "iothread":"io0"}}' "return"
fi

_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"n"}}' "error" # Attempt add without server
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-start",
  "arguments":{"addr":{"type":"unix",
    "data":{"path":"'"$SOCK_DIR/nbd"'"}}}}' "return"
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-start",
  "arguments":{"addr":{"type":"unix",
    "data":{"path":"'"$SOCK_DIR/nbd"1'"}}}}' "error" # Attempt second server
$QEMU_NBD_PROG -L -k "$SOCK_DIR/nbd"
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"n", "bitmap":"b"}}' "return"
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"nosuch"}}' "error" # Attempt to export missing node
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"n"}}' "error" # Attempt to export same name twice
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"n", "name":"n2",
  "bitmap":"b2"}}' "error" # enabled vs. read-only
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"n", "name":"n2",
  "bitmap":"b3"}}' "error" # Missing bitmap
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-add",
  "arguments":{"device":"n", "name":"n2", "writable":true,
  "description":"some text", "bitmap":"b2"}}' "return"
$QEMU_NBD_PROG -L -k "$SOCK_DIR/nbd"

echo
echo "=== Contrast normal status to large granularity dirty-bitmap ==="
echo

QEMU_IO_OPTIONS=$QEMU_IO_OPTIONS_NO_FMT
IMG="driver=nbd,export=n,server.type=unix,server.path=$SOCK_DIR/nbd"
$QEMU_IO -r -c 'r -P 0x22 512 512' -c 'r -P 0 512k 512k' -c 'r -P 0x11 1m 1m' \
  -c 'r -P 0x33 2m 2m' --image-opts "$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 "=== Contrast to small granularity dirty-bitmap ==="
echo

IMG="driver=nbd,export=n2,server.type=unix,server.path=$SOCK_DIR/nbd"
$QEMU_IMG map --output=json --image-opts \
  "$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b2" | _filter_qemu_img_map

echo
echo "=== End qemu NBD server ==="
echo

_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-remove",
  "arguments":{"name":"n"}}' "return"
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-remove",
  "arguments":{"name":"n2"}}' "return"
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-remove",
  "arguments":{"name":"n2"}}' "error" # Attempt duplicate clean
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-stop"}' "return"
_send_qemu_cmd $QEMU_HANDLE '{"execute":"nbd-server-stop"}' "error" # Again

done

_send_qemu_cmd $QEMU_HANDLE '{"execute":"quit"}' "return"
wait=yes _cleanup_qemu

echo
echo "=== Use qemu-nbd as server ==="
echo

nbd_server_start_unix_socket -r -f $IMGFMT -B b "$TEST_IMG"
IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
$QEMU_IMG map --output=json --image-opts \
  "$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b" | _filter_qemu_img_map

nbd_server_start_unix_socket -f $IMGFMT -B b2 "$TEST_IMG"
IMG="driver=nbd,server.type=unix,server.path=$nbd_unix_socket"
$QEMU_IMG map --output=json --image-opts --max-length=12345 \
  "$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b2" | _filter_qemu_img_map
$QEMU_IMG map --output=json --image-opts --start-offset=12345 \
  "$IMG,x-dirty-bitmap=qemu:dirty-bitmap:b2" | _filter_qemu_img_map

# success, all done
echo '*** done'
rm -f $seq.full
status=0