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xen-blkback: use balloon pages for persistent grants

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With current persistent grants implementation we are not freeing the
persistent grants after we disconnect the device. Since grant map
operations change the mfn of the allocated page, and we can no longer
pass it to __free_page without setting the mfn to a sane value, use
balloon grant pages instead, as the gntdev device does.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: stable@vger.kernel.org
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Roger Pau Monne 2013-02-14 11:12:09 +01:00 committed by Konrad Rzeszutek Wilk
parent f84adf4921
commit 087ffecdaa
1 changed files with 4 additions and 2 deletions
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6
drivers/block/xen-blkback/blkback.c
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@ -46,6 +46,7 @@
#include <xen/xen.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <xen/balloon.h>
#include "common.h"
/*
@ -239,6 +240,7 @@ static void free_persistent_gnts(struct rb_root *root, unsigned int num)
ret = gnttab_unmap_refs(unmap, NULL, pages,
segs_to_unmap);
BUG_ON(ret);
free_xenballooned_pages(segs_to_unmap, pages);
segs_to_unmap = 0;
}
@ -527,8 +529,8 @@ static int xen_blkbk_map(struct blkif_request *req,
GFP_KERNEL);
if (!persistent_gnt)
return -ENOMEM;
persistent_gnt->page = alloc_page(GFP_KERNEL);
if (!persistent_gnt->page) {
if (alloc_xenballooned_pages(1, &persistent_gnt->page,
false)) {
kfree(persistent_gnt);
return -ENOMEM;
}