On Wed, Apr 19, 2017 at 05:43:42PM +0800, Fam Zheng wrote:
> This function tries to request, if not granted yet, for the given
> permissions.
>
> Signed-off-by: Fam Zheng <f...@redhat.com>
> ---
> block/block-backend.c | 12 ++++++++++++
> include/sysemu/block-backend.h | 1 +
> 2 files changed, 13 insertions(+)
>
> diff --git a/block/block-backend.c b/block/block-backend.c
> index 7405024..6bdd9ce 100644
> --- a/block/block-backend.c
> +++ b/block/block-backend.c
> @@ -629,6 +629,18 @@ void blk_resume_after_migration(Error **errp)
> }
> }
>
> +int blk_request_perm(BlockBackend *blk, uint64_t perm, Error **errp)
> +{
> + uint64_t blk_perm, shared_perm;
> +
> + blk_get_perm(blk, &blk_perm, &shared_perm);
> + if ((blk_perm & perm) == perm) {
> + return 0;
> + }
> + blk_perm |= perm;
> + return blk_set_perm(blk, blk_perm, shared_perm, errp);
> +}I'm slightly confused about why this function is needed. blk_set_perm() doesn't do quite the right thing?
signature.asc
Description: PGP signature
