Re: [Qemu-devel] [PATCH v5 4/7] block: Add checks of blocker in block operations

[Paolo Bonzini]

Il 26/11/2013 05:05, Fam Zheng ha scritto:
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -1001,6 +1001,11 @@ SnapshotInfo 
> *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
>          return NULL;
>      }
>  
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
> +                           errp)) {
> +        return NULL;
> +    }

Why not check in bdrv_snapshot_delete...

>      ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
>      if (error_is_set(&local_err)) {
>          error_propagate(errp, local_err);
> @@ -1098,6 +1103,10 @@ static void 
> internal_snapshot_prepare(BlkTransactionState *common,
>          return;
>      }
>  
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
> +        return;
> +    }

... and bdrv_snapshot_create?

>      if (!bdrv_is_inserted(bs)) {
>          error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
>          return;
> @@ -1536,6 +1545,10 @@ void qmp_change_blockdev(const char *device, const 
> char *filename,
>          return;
>      }
>  
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
> +        return;
> +    }
> +
>      if (format) {
>          drv = bdrv_find_whitelisted_format(format, bs->read_only);
>          if (!drv) {
> @@ -1684,6 +1697,10 @@ void qmp_block_resize(const char *device, int64_t 
> size, Error **errp)
>          return;
>      }
>  
> +    if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, errp)) {
> +        return;
> +    }
> +
>      if (size < 0) {
>          error_set(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
>          return;
> -- 

This should be redundant since bdrv_truncate already checks.

Paolo