On Sun, Feb 23, Stefano Stabellini wrote:
> Given that 4.2 is the first Xen release to have BLKIF_OP_DISCARD, maybe
> we could just #define BLKIF_OP_DISCARD 5 in that case?
> Do we actually need to #ifndef BLKIF_OP_DISCARD?
I will do just the #define and resend with that change.
Olaf
On Thu, 20 Feb 2014, Olaf Hering wrote:
> On Thu, Feb 20, Stefano Stabellini wrote:
>
> > On Thu, 6 Feb 2014, Olaf Hering wrote:
> > > @@ -253,6 +254,8 @@ static int ioreq_parse(struct ioreq *ioreq)
> > > case BLKIF_OP_WRITE:
> > > ioreq->prot = PROT_READ; /* from memory */
> > >
On Thu, Feb 20, Stefano Stabellini wrote:
> On Thu, 6 Feb 2014, Olaf Hering wrote:
> > @@ -253,6 +254,8 @@ static int ioreq_parse(struct ioreq *ioreq)
> > case BLKIF_OP_WRITE:
> > ioreq->prot = PROT_READ; /* from memory */
> > break;
> > +case BLKIF_OP_DISCARD:
> > +
On Thu, 20 Feb 2014, Olaf Hering wrote:
> On Thu, Feb 20, Stefano Stabellini wrote:
>
> > On Thu, 6 Feb 2014, Olaf Hering wrote:
> > > @@ -253,6 +254,8 @@ static int ioreq_parse(struct ioreq *ioreq)
> > > case BLKIF_OP_WRITE:
> > > ioreq->prot = PROT_READ; /* from memory */
> > >
On Thu, Feb 20, Stefano Stabellini wrote:
> On Thu, 6 Feb 2014, Olaf Hering wrote:
> > @@ -253,6 +254,8 @@ static int ioreq_parse(struct ioreq *ioreq)
> > case BLKIF_OP_WRITE:
> > ioreq->prot = PROT_READ; /* from memory */
> > break;
> > +case BLKIF_OP_DISCARD:
> > +
On Thu, 6 Feb 2014, Olaf Hering wrote:
> @@ -253,6 +254,8 @@ static int ioreq_parse(struct ioreq *ioreq)
> case BLKIF_OP_WRITE:
> ioreq->prot = PROT_READ; /* from memory */
> break;
> +case BLKIF_OP_DISCARD:
> +return 0;
> default:
> xen_be_printf(&b
Implement discard support for xen_disk. It makes use of the existing
discard code in qemu.
The discard support is enabled unconditionally. The tool stack may
provide a property "discard-enable" in the backend node to optionally
disable discard support. This is helpful in case the backing file was
