Re: [PATCH v3 13/33] block/nbd: introduce nbd_client_connection_release()

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

28.04.2021 01:35, Roman Kagan wrote:
> On Fri, Apr 16, 2021 at 11:08:51AM +0300, Vladimir Sementsov-Ogievskiy wrote:
>> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>> ---
>>   block/nbd.c | 43 ++++++++++++++++++++++++++-----------------
>>   1 file changed, 26 insertions(+), 17 deletions(-)
>>
>> diff --git a/block/nbd.c b/block/nbd.c
>> index 21a4039359..8531d019b2 100644
>> --- a/block/nbd.c
>> +++ b/block/nbd.c
>> @@ -118,7 +118,7 @@ typedef struct BDRVNBDState {
>>       NBDClientConnection *conn;
>>   } BDRVNBDState;
>>   
>> -static void nbd_free_connect_thread(NBDClientConnection *conn);
>> +static void nbd_client_connection_release(NBDClientConnection *conn);
>>   static int nbd_establish_connection(BlockDriverState *bs, SocketAddress *saddr,
>>                                       Error **errp);
>>   static coroutine_fn QIOChannelSocket *
>> @@ -130,20 +130,9 @@ static void nbd_yank(void *opaque);
>>   static void nbd_clear_bdrvstate(BlockDriverState *bs)
>>   {
>>       BDRVNBDState *s = (BDRVNBDState *)bs->opaque;
>> -    NBDClientConnection *conn = s->conn;
>> -    bool do_free;
>> -
>> -    qemu_mutex_lock(&conn->mutex);
>> -    if (conn->running) {
>> -        conn->detached = true;
>> -    }
>> -    do_free = !conn->running && !conn->detached;
>> -    qemu_mutex_unlock(&conn->mutex);
>>   
>> -    /* the runaway thread will clean it up itself */
>> -    if (do_free) {
>> -        nbd_free_connect_thread(conn);
>> -    }
>> +    nbd_client_connection_release(s->conn);
>> +    s->conn = NULL;
>>   
>>       yank_unregister_instance(BLOCKDEV_YANK_INSTANCE(bs->node_name));
>>   
>> @@ -365,7 +354,7 @@ nbd_client_connection_new(const SocketAddress *saddr)
>>       return conn;
>>   }
>>   
>> -static void nbd_free_connect_thread(NBDClientConnection *conn)
>> +static void nbd_client_connection_do_free(NBDClientConnection *conn)
>>   {
>>       if (conn->sioc) {
>>           qio_channel_close(QIO_CHANNEL(conn->sioc), NULL);
>> @@ -379,8 +368,8 @@ static void nbd_free_connect_thread(NBDClientConnection *conn)
>>   static void *connect_thread_func(void *opaque)
>>   {
>>       NBDClientConnection *conn = opaque;
>> +    bool do_free;
>>       int ret;
>> -    bool do_free = false;
>>   
> 
> This hunk belongs in patch 8.
> 

Agree

> 
>>       conn->sioc = qio_channel_socket_new();
>>   
>> @@ -405,12 +394,32 @@ static void *connect_thread_func(void *opaque)
>>       qemu_mutex_unlock(&conn->mutex);
>>   
>>       if (do_free) {
>> -        nbd_free_connect_thread(conn);
>> +        nbd_client_connection_do_free(conn);
>>       }
>>   
>>       return NULL;
>>   }
>>   
>> +static void nbd_client_connection_release(NBDClientConnection *conn)
>> +{
>> +    bool do_free;
>> +
>> +    if (!conn) {
>> +        return;
>> +    }
>> +
>> +    qemu_mutex_lock(&conn->mutex);
>> +    if (conn->running) {
>> +        conn->detached = true;
>> +    }
>> +    do_free = !conn->running && !conn->detached;
>> +    qemu_mutex_unlock(&conn->mutex);
>> +
>> +    if (do_free) {
>> +        nbd_client_connection_do_free(conn);
>> +    }
>> +}
>> +
>>   /*
>>    * Get a new connection in context of @conn:
>>    *   if thread is running, wait for completion
>> -- 
>> 2.29.2
>>


-- 
Best regards,
Vladimir