Re: [Qemu-devel] [PATCH v12 09/16] iotests: 085: Avoid image locking conflict

[Max Reitz]

On 23.01.2017 13:30, Fam Zheng wrote:
> In the case where we test the expected error when a blockdev-snapshot
> target already has a backing image, backing chain is opened multiple

*the backing chain

> times. This will be a problem when we use image locking, so use a
> different backing file that is not already open.
> 
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  tests/qemu-iotests/085     | 32 +++++++++++++++++++-------------
>  tests/qemu-iotests/085.out |  3 ++-
>  2 files changed, 21 insertions(+), 14 deletions(-)
> 
> diff --git a/tests/qemu-iotests/085 b/tests/qemu-iotests/085
> index c53e97f..c91d78d 100755
> --- a/tests/qemu-iotests/085
> +++ b/tests/qemu-iotests/085
> @@ -87,24 +87,26 @@ function create_group_snapshot()
>  }
>  
>  # ${1}: unique identifier for the snapshot filename
> -# ${2}: true: open backing images; false: don't open them (default)
> +# ${2}: extra_params to the blockdev-add command
> +# ${3}: filename
> +function do_blockdev_add()
> +{
> +    cmd="{ 'execute': 'blockdev-add', 'arguments':
> +           { 'driver': 'qcow2', 'node-name': 'snap_${1}', ${2}
> +             'file':
> +             { 'driver': 'file', 'filename': '${3}',
> +               'node-name': 'file_${1}' } } }"
> +    _send_qemu_cmd $h "${cmd}" "return"
> +}
> +
> +# ${1}: unique identifier for the snapshot filename
>  function add_snapshot_image()
>  {
> -    if [ "${2}" = "true" ]; then
> -        extra_params=""
> -    else
> -        extra_params="'backing': '', "
> -    fi
>      base_image="${TEST_DIR}/$((${1}-1))-${snapshot_virt0}"
>      snapshot_file="${TEST_DIR}/${1}-${snapshot_virt0}"
>      _make_test_img -b "${base_image}" "$size"
>      mv "${TEST_IMG}" "${snapshot_file}"
> -    cmd="{ 'execute': 'blockdev-add', 'arguments':
> -           { 'driver': 'qcow2', 'node-name': 'snap_${1}', ${extra_params}
> -             'file':
> -             { 'driver': 'file', 'filename': '${snapshot_file}',
> -               'node-name': 'file_${1}' } } }"
> -    _send_qemu_cmd $h "${cmd}" "return"
> +    do_blockdev_add "$1" "'backing': '', " "${snapshot_file}"
>  }
>  
>  # ${1}: unique identifier for the snapshot filename
> @@ -222,7 +224,11 @@ echo === Invalid command - snapshot node has a backing 
> image ===
>  echo
>  
>  SNAPSHOTS=$((${SNAPSHOTS}+1))
> -add_snapshot_image ${SNAPSHOTS} true
> +
> +_make_test_img "$size"
> +mv "${TEST_IMG}" "${TEST_IMG}.base"
> +_make_test_img -b "${TEST_IMG}.base" "$size"
> +do_blockdev_add ${SNAPSHOTS} "" "${TEST_IMG}"

These files ($TEST_IMG and ${TEST_IMG}.base) are not removed in _cleanup.

Looks good apart from that.

Max

>  blockdev_snapshot ${SNAPSHOTS} error
>  
>  echo
> diff --git a/tests/qemu-iotests/085.out b/tests/qemu-iotests/085.out
> index 08e4bb7..7bbf84d 100644
> --- a/tests/qemu-iotests/085.out
> +++ b/tests/qemu-iotests/085.out
> @@ -78,7 +78,8 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
> backing_file=TEST_DIR/
>  
>  === Invalid command - snapshot node has a backing image ===
>  
> -Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
> backing_file=TEST_DIR/12-snapshot-v0.IMGFMT
> +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
> +Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728 
> backing_file=TEST_DIR/t.IMGFMT.base
>  {"return": {}}
>  {"error": {"class": "GenericError", "desc": "The snapshot already has a 
> backing image"}}
>  
>

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