Le Wednesday 08 Aug 2012 à 16:37:13 (+0100), Stefan Hajnoczi a écrit :
> On Tue, Aug 7, 2012 at 2:44 PM, Benoît Canet <benoit.ca...@gmail.com> wrote:
> > +static int quorum_check_ret(QuorumAIOCB *acb)
> > +{
> > + int i, j;
> > +
> > + for (i = 0, j = 0; i <= 2; i++) {
> > + if (acb->aios[0].ret) {
> > + j++;
> > + }
> > + }
> > +
> > + if (j > 1) {
> > + return -EIO;
> > + }
> > +
> > + return 0;
> > +}
>
> Simpler version just scans the return values (also I think
> acb->aios[0].ret should be acb->aios[i].ret):
>
> static int quorum_check_ret(QuorumAIOCB *acb)
> {
> int i;
> for (i = 0; i <= 2; i++) {
> if (acb->aios[i].ret) {
> return -EIO; /* or acb->aios[i].ret */
> }
> }
> return 0;
> }
I am wondering what is the best code to return.
There is some potential case like a filer containing a particular
image (or a image on the network) going down where the user probably
don't want to get an -EIO.
The
if (j > 1) {
return -EIO;
}
part was about detecting an error count greater dans the threshold (2).
>
> > +
> > +static void quorum_aio_bh(void *opaque)
> > +{
> > + QuorumAIOCB *acb = opaque;
> > +
> > + qemu_bh_delete(acb->bh);
> > + acb->common.cb(acb->common.opaque, quorum_check_ret(acb));
> > + if (acb->finished) {
> > + *acb->finished = true;
> > + }
> > + qemu_aio_release(acb);
> > +}
> > +
> > +static QuorumAIOCB *quorum_aio_get(BlockDriverState *bs,
> > + QEMUIOVector *qiov,
> > + int64_t sector_num,
> > + int nb_sectors,
> > + BlockDriverCompletionFunc *cb,
> > + void *opaque)
> > +{
> > + QuorumAIOCB *acb = qemu_aio_get(&quorum_aio_pool, bs, cb, opaque);
> > + int i;
> > +
> > + acb->qiov = qiov;
> > + acb->bh = NULL;
> > + acb->count = 0;
> > + acb->sector_num = sector_num;
> > + acb->nb_sectors = nb_sectors;
> > + acb->vote = NULL;
> > + acb->vote_ret = 0;
>
> acb->finished = NULL;
>
