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xen/blkback: use grant-table.c hypercall wrappers 

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Daniel De Graaf 2011-11-28 11:49:03 -05:00 committed by Jens Axboe
parent c16fa4f2ad
commit 4f14faaab4
1 changed files with 4 additions and 25 deletions
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29
drivers/block/xen-blkback/blkback.c
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@ -321,6 +321,7 @@ struct seg_buf {
static void xen_blkbk_unmap(struct pending_req *req)
{
struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
unsigned int i, invcount = 0;
grant_handle_t handle;
int ret;
@ -332,25 +333,12 @@ static void xen_blkbk_unmap(struct pending_req *req)
gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
GNTMAP_host_map, handle);
pending_handle(req, i) = BLKBACK_INVALID_HANDLE;
pages[invcount] = virt_to_page(vaddr(req, i));
invcount++;
}
ret = HYPERVISOR_grant_table_op(
GNTTABOP_unmap_grant_ref, unmap, invcount);
ret = gnttab_unmap_refs(unmap, pages, invcount, false);
BUG_ON(ret);
/*
* Note, we use invcount, so nr->pages, so we can't index
* using vaddr(req, i).
*/
for (i = 0; i < invcount; i++) {
ret = m2p_remove_override(
virt_to_page(unmap[i].host_addr), false);
if (ret) {
pr_alert(DRV_PFX "Failed to remove M2P override for %lx\n",
(unsigned long)unmap[i].host_addr);
continue;
}
}
}
static int xen_blkbk_map(struct blkif_request *req,
@ -378,7 +366,7 @@ static int xen_blkbk_map(struct blkif_request *req,
pending_req->blkif->domid);
}
ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map, nseg);
ret = gnttab_map_refs(map, NULL, &blkbk->pending_page(pending_req, 0), nseg);
BUG_ON(ret);
/*
@ -398,15 +386,6 @@ static int xen_blkbk_map(struct blkif_request *req,
if (ret)
continue;
ret = m2p_add_override(PFN_DOWN(map[i].dev_bus_addr),
blkbk->pending_page(pending_req, i), NULL);
if (ret) {
pr_alert(DRV_PFX "Failed to install M2P override for %lx (ret: %d)\n",
(unsigned long)map[i].dev_bus_addr, ret);
/* We could switch over to GNTTABOP_copy */
continue;
}
seg[i].buf = map[i].dev_bus_addr |
(req->u.rw.seg[i].first_sect << 9);
}