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Subject[PATCH 2/6] block: xen-blkback: use API provided by xenbus module to map rings
Date
From: David Vrabel <david.vrabel@citrix.com>

The xenbus module provides xenbus_map_ring_page() and
xenbus_map_ring_page(). Use these to map the ring pages granted by
the frontend.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
---
drivers/block/xen-blkback/common.h | 5 +--
drivers/block/xen-blkback/xenbus.c | 55 +++++------------------------------
2 files changed, 9 insertions(+), 51 deletions(-)
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 9e40b28..65ef268 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -139,7 +139,7 @@ struct xen_blkif {
/* Comms information. */
enum blkif_protocol blk_protocol;
union blkif_back_rings blk_rings;
- struct vm_struct *blk_ring_area;
+ struct page *blk_ring_page;
/* The VBD attached to this interface. */
struct xen_vbd vbd;
/* Back pointer to the backend_info. */
@@ -163,9 +163,6 @@ struct xen_blkif {
int st_wr_sect;

wait_queue_head_t waiting_to_free;
-
- grant_handle_t shmem_handle;
- grant_ref_t shmem_ref;
};


diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 3f129b4..7e21ef4 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -120,38 +120,6 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
return blkif;
}

-static int map_frontend_page(struct xen_blkif *blkif, unsigned long shared_page)
-{
- struct gnttab_map_grant_ref op;
-
- gnttab_set_map_op(&op, (unsigned long)blkif->blk_ring_area->addr,
- GNTMAP_host_map, shared_page, blkif->domid);
-
- if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1))
- BUG();
-
- if (op.status) {
- DPRINTK("Grant table operation failure !\n");
- return op.status;
- }
-
- blkif->shmem_ref = shared_page;
- blkif->shmem_handle = op.handle;
-
- return 0;
-}
-
-static void unmap_frontend_page(struct xen_blkif *blkif)
-{
- struct gnttab_unmap_grant_ref op;
-
- gnttab_set_unmap_op(&op, (unsigned long)blkif->blk_ring_area->addr,
- GNTMAP_host_map, blkif->shmem_handle);
-
- if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
- BUG();
-}
-
static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
unsigned int evtchn)
{
@@ -161,35 +129,30 @@ static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
if (blkif->irq)
return 0;

- blkif->blk_ring_area = alloc_vm_area(PAGE_SIZE);
- if (!blkif->blk_ring_area)
- return -ENOMEM;
-
- err = map_frontend_page(blkif, shared_page);
- if (err) {
- free_vm_area(blkif->blk_ring_area);
+ err = xenbus_map_ring_page(blkif->be->dev, shared_page,
+ &blkif->blk_ring_page);
+ if (err < 0)
return err;
- }

switch (blkif->blk_protocol) {
case BLKIF_PROTOCOL_NATIVE:
{
struct blkif_sring *sring;
- sring = (struct blkif_sring *)blkif->blk_ring_area->addr;
+ sring = page_address(blkif->blk_ring_page);
BACK_RING_INIT(&blkif->blk_rings.native, sring, PAGE_SIZE);
break;
}
case BLKIF_PROTOCOL_X86_32:
{
struct blkif_x86_32_sring *sring_x86_32;
- sring_x86_32 = (struct blkif_x86_32_sring *)blkif->blk_ring_area->addr;
+ sring_x86_32 = page_address(blkif->blk_ring_page);
BACK_RING_INIT(&blkif->blk_rings.x86_32, sring_x86_32, PAGE_SIZE);
break;
}
case BLKIF_PROTOCOL_X86_64:
{
struct blkif_x86_64_sring *sring_x86_64;
- sring_x86_64 = (struct blkif_x86_64_sring *)blkif->blk_ring_area->addr;
+ sring_x86_64 = page_address(blkif->blk_ring_page);
BACK_RING_INIT(&blkif->blk_rings.x86_64, sring_x86_64, PAGE_SIZE);
break;
}
@@ -201,8 +164,7 @@ static int xen_blkif_map(struct xen_blkif *blkif, unsigned long shared_page,
xen_blkif_be_int, 0,
"blkif-backend", blkif);
if (err < 0) {
- unmap_frontend_page(blkif);
- free_vm_area(blkif->blk_ring_area);
+ xenbus_unmap_ring_page(blkif->be->dev, blkif->blk_ring_page);
blkif->blk_rings.common.sring = NULL;
return err;
}
@@ -228,8 +190,7 @@ static void xen_blkif_disconnect(struct xen_blkif *blkif)
}

if (blkif->blk_rings.common.sring) {
- unmap_frontend_page(blkif);
- free_vm_area(blkif->blk_ring_area);
+ xenbus_unmap_ring_page(blkif->be->dev, blkif->blk_ring_page);
blkif->blk_rings.common.sring = NULL;
}
}
--
1.7.2.5


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