Re: [Qemu-devel] quorum: validate vote threshold against num_children even if read-pattern is fifo

[Wen Congyang <wency@cn.fujitsu.com>]

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On 07/03/2015 02:45 PM, Wen Congyang wrote:
> We need to use threshold to check if too many write operation fails.
> If threshold is larger than num children, we always get write error
> event even if all write operations success.
> 
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
> ---
>  block/quorum.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/block/quorum.c b/block/quorum.c
> index a7df17c..b0eead0 100644
> --- a/block/quorum.c
> +++ b/block/quorum.c
> @@ -894,6 +894,12 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags,
>      }
>  
>      s->threshold = qemu_opt_get_number(opts, QUORUM_OPT_VOTE_THRESHOLD, 0);
> +    /* and validate it against s->num_children */
> +    ret = quorum_valid_threshold(s->threshold, s->num_children, &local_err);
> +    if (ret < 0) {
> +        goto exit;
> +    }
> +
>      ret = parse_read_pattern(qemu_opt_get(opts, QUORUM_OPT_READ_PATTERN));
>      if (ret < 0) {
>          error_setg(&local_err, "Please set read-pattern as fifo or quorum");
> @@ -902,12 +908,6 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags,
>      s->read_pattern = ret;
>  
>      if (s->read_pattern == QUORUM_READ_PATTERN_QUORUM) {
> -        /* and validate it against s->num_children */
> -        ret = quorum_valid_threshold(s->threshold, s->num_children, &local_err);
> -        if (ret < 0) {
> -            goto exit;
> -        }
> -
>          /* is the driver in blkverify mode */
>          if (qemu_opt_get_bool(opts, QUORUM_OPT_BLKVERIFY, false) &&
>              s->num_children == 2 && s->threshold == 2) {
>