Re: [PATCH 21/29] block/export: Add BLOCK_EXPORT_DELETED event

[Max Reitz]

On 07.09.20 20:20, Kevin Wolf wrote:
> Clients may want to know when an export has finally disappeard
> (block-export-del returns earlier than that in the general case), so add
> a QAPI event for it.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  qapi/block-export.json     | 12 ++++++++++++
>  block/export/export.c      |  2 ++
>  tests/qemu-iotests/140.out |  1 +
>  tests/qemu-iotests/223.out |  4 ++++
>  4 files changed, 19 insertions(+)
> 
> diff --git a/qapi/block-export.json b/qapi/block-export.json
> index 77a6b595e8..dac3250f08 100644
> --- a/qapi/block-export.json
> +++ b/qapi/block-export.json
> @@ -233,3 +233,15 @@
>  ##
>  { 'command': 'block-export-del',
>    'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' } }
> +
> +##
> +# @BLOCK_EXPORT_DELETED:
> +#
> +# Emitted when a block export is removed and it's id can be reused.
> +#
> +# @id: Block export id.
> +#
> +# Since: 5.2
> +##
> +{ 'event': 'BLOCK_EXPORT_DELETED',
> +  'data': { 'id': 'str' } }
> diff --git a/block/export/export.c b/block/export/export.c
> index 4af3b69186..ae7879e6a9 100644
> --- a/block/export/export.c
> +++ b/block/export/export.c
> @@ -19,6 +19,7 @@
>  #include "block/nbd.h"
>  #include "qapi/error.h"
>  #include "qapi/qapi-commands-block-export.h"
> +#include "qapi/qapi-events-block-export.h"
>  #include "qemu/id.h"
>  
>  static const BlockExportDriver *blk_exp_drivers[] = {
> @@ -113,6 +114,7 @@ static void blk_exp_delete_bh(void *opaque)
>      assert(exp->refcount == 0);
>      QLIST_REMOVE(exp, next);
>      exp->drv->delete(exp);
> +    qapi_event_send_block_export_deleted(exp->id);
>      g_free(exp->id);
>      g_free(exp);
>  
> diff --git a/tests/qemu-iotests/140.out b/tests/qemu-iotests/140.out
> index 86b985da75..f1db409b26 100644
> --- a/tests/qemu-iotests/140.out
> +++ b/tests/qemu-iotests/140.out
> @@ -15,6 +15,7 @@ read 65536/65536 bytes at offset 0
>  qemu-io: can't open device nbd+unix:///drv?socket=SOCK_DIR/nbd: Requested 
> export not available
>  server reported: export 'drv' not present
>  { 'execute': 'quit' }
> +{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
> "BLOCK_EXPORT_DELETED", "data": {"id": "drv"}}
>  {"return": {}}
>  {"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": 
> "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
>  *** done

With -qed, this event appears immediately when the drive is ejected, so
this test now fails (for qed).

I’m not sure whether there’s much of a point in fixing it or just
marking qed as unsupported.

Max

signature.asc
Description: OpenPGP digital signature