From patchwork Fri Aug 3 16:42:56 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Luiz Capitulino X-Patchwork-Id: 175020 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 836042C0089 for ; Sat, 4 Aug 2012 02:43:31 +1000 (EST) Received: from localhost ([::1]:38762 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SxKyH-0008P7-NX for incoming@patchwork.ozlabs.org; Fri, 03 Aug 2012 12:43:29 -0400 Received: from eggs.gnu.org ([208.118.235.92]:46604) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SxKxa-0006NU-EN for qemu-devel@nongnu.org; Fri, 03 Aug 2012 12:42:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SxKxQ-0002TL-IP for qemu-devel@nongnu.org; Fri, 03 Aug 2012 12:42:46 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42719) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SxKxQ-0002T9-8p for qemu-devel@nongnu.org; Fri, 03 Aug 2012 12:42:36 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q73GgV2Y004795 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 3 Aug 2012 12:42:31 -0400 Received: from localhost (ovpn-113-174.phx2.redhat.com [10.3.113.174]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q73GgUJN008430; Fri, 3 Aug 2012 12:42:30 -0400 From: Luiz Capitulino To: aliguori@us.ibm.com Date: Fri, 3 Aug 2012 13:42:56 -0300 Message-Id: <1344012178-21084-3-git-send-email-lcapitulino@redhat.com> In-Reply-To: <1344012178-21084-1-git-send-email-lcapitulino@redhat.com> References: <1344012178-21084-1-git-send-email-lcapitulino@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-MIME-Autoconverted: from 8bit to quoted-printable by mx1.redhat.com id q73GgV2Y004795 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.132.183.28 Cc: =?UTF-8?q?Beno=C3=AEt=20Canet?= , qemu-devel@nongnu.org, Benoit Canet Subject: [Qemu-devel] [PATCH 2/4] block: create bdrv_get_backing_file_depth() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Benoît Canet Create bdrv_get_backing_file_depth() in order to be able to show in QMP and HMP how many ancestors backing an image a block device have. Signed-off-by: Benoit Canet Reviewed-by: Eric Blake Signed-off-by: Luiz Capitulino --- block.c | 13 +++++++++++++ block.h | 1 + 2 files changed, 14 insertions(+) diff --git a/block.c b/block.c index b38940b..1206bba 100644 --- a/block.c +++ b/block.c @@ -2754,6 +2754,19 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, return NULL; } +int bdrv_get_backing_file_depth(BlockDriverState *bs) +{ + if (!bs->drv) { + return 0; + } + + if (!bs->backing_hd) { + return 0; + } + + return 1 + bdrv_get_backing_file_depth(bs->backing_hd); +} + #define NB_SUFFIXES 4 char *get_human_readable_size(char *buf, int buf_size, int64_t size) diff --git a/block.h b/block.h index c89590d..650d872 100644 --- a/block.h +++ b/block.h @@ -174,6 +174,7 @@ int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top, int nb_sectors, int *pnum); BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *backing_file); +int bdrv_get_backing_file_depth(BlockDriverState *bs); int bdrv_truncate(BlockDriverState *bs, int64_t offset); int64_t bdrv_getlength(BlockDriverState *bs); int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);