From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCHv5 12/14] xen-blkback: safely unmap grants in
 case they are still in use
Date: Thu, 12 Mar 2015 18:25:36 +0000
Message-ID: <5501DA20.80002@citrix.com>
References: <1422377057-19221-1-git-send-email-david.vrabel@citrix.com>	<1422377057-19221-13-git-send-email-david.vrabel@citrix.com>	<54FD6331.8040503@oracle.com>	<54FD6831.5020700@citrix.com>
	<54FD7B49.7080401@oracle.com>	<54FD7DC8.60401@citrix.com>
	<5500D90A.6080006@oracle.com> <55010869.6000403@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="windows-1252"
Content-Transfer-Encoding: quoted-printable
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta3.messagelabs.com ([195.245.230.39])
	by lists.xen.org with esmtp (Exim 4.72)
	(envelope-from <david.vrabel@citrix.com>) id 1YW7nt-0008DW-4S
	for xen-devel@lists.xenproject.org; Thu, 12 Mar 2015 18:25:53 +0000
In-Reply-To: <55010869.6000403@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: =?windows-1252?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com>, Bob Liu <bob.liu@oracle.com>, David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Jenny Herbert <jennifer.herbert@citrix.com>
List-Id: xen-devel@lists.xenproject.org

On 12/03/15 03:30, Roger Pau Monn=E9 wrote:
> =

> @@ -343,20 +353,19 @@ void xen_blkbk_unmap_purged_grants(struct work_stru=
ct *work)
>  =

>  		pages[segs_to_unmap] =3D persistent_gnt->page;
>  =

> -		if (++segs_to_unmap =3D=3D BLKIF_MAX_SEGMENTS_PER_REQUEST) {
> -			ret =3D gnttab_unmap_refs(unmap, NULL, pages,
> -				segs_to_unmap);
> -			BUG_ON(ret);
> +		if (++segs_to_unmap =3D=3D BLKIF_MAX_SEGMENTS_PER_REQUEST ||
> +		    list_empty(&blkif->persistent_purge_list)) {
> +
> +			unmap_data.count =3D segs_to_unmap;
> +			gnttab_unmap_refs_async(&unmap_data);
> +			wait_for_completion(&unmap_completion);
> +

We now have a number of places that use the async unmap and wait for
completion.  Could this be moved into common code?

David