int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn)
{
int ref;
ref = get_free_entries(1);
if (unlikely(ref < 0))
return -ENOSPC;
gnttab_grant_foreign_transfer_ref(ref, domid, pfn);
return ref;
}
int gnttab_alloc_grant_references(u16 count, grant_ref_t *head)
{
int h = get_free_entries(count);
if (h < 0)
return -ENOSPC;
*head = h;
return 0;
}
int
gnttab_alloc_grant_references(uint16_t count, grant_ref_t *head)
{
int ref, error;
error = get_free_entries(count, &ref);
if (__predict_false(error))
return (error);
*head = ref;
return (0);
}
int gnttab_grant_foreign_access(domid_t domid, unsigned long frame,
int readonly)
{
int ref;
ref = get_free_entries(1);
if (unlikely(ref < 0))
return -ENOSPC;
gnttab_grant_foreign_access_ref(ref, domid, frame, readonly);
return ref;
}
int
gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn,
grant_ref_t *result)
{
int error, ref;
error = get_free_entries(1, &ref);
if (__predict_false(error))
return (error);
gnttab_grant_foreign_transfer_ref(ref, domid, pfn);
*result = ref;
return (0);
}
int gnttab_grant_foreign_access_trans(domid_t domid, int flags,
domid_t trans_domid,
grant_ref_t trans_gref)
{
int ref, rc;
ref = get_free_entries(1);
if (unlikely(ref < 0))
return -ENOSPC;
rc = gnttab_grant_foreign_access_trans_ref(ref, domid, flags,
trans_domid, trans_gref);
if (rc < 0) {
put_free_entry(ref);
return rc;
}
return ref;
}
int gnttab_grant_foreign_access_subpage(domid_t domid, unsigned long frame,
int flags, unsigned page_off,
unsigned length)
{
int ref, rc;
ref = get_free_entries(1);
if (unlikely(ref < 0))
return -ENOSPC;
rc = gnttab_grant_foreign_access_subpage_ref(ref, domid, frame, flags,
page_off, length);
if (rc < 0) {
put_free_entry(ref);
return rc;
}
return ref;
}
int
gnttab_grant_foreign_access(domid_t domid, unsigned long frame, int readonly,
grant_ref_t *result)
{
int error, ref;
error = get_free_entries(1, &ref);
if (__predict_false(error))
return (error);
shared[ref].frame = frame;
shared[ref].domid = domid;
wmb();
shared[ref].flags = GTF_permit_access | (readonly ? GTF_readonly : 0);
if (result)
*result = ref;
return (0);
}
