From patchwork Wed Jan 4 14:08:55 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marcelo Tosatti X-Patchwork-Id: 134255 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 5DDEE1007D7 for ; Thu, 5 Jan 2012 01:12:10 +1100 (EST) Received: from localhost ([::1]:56223 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RiRZX-0000TG-Bt for incoming@patchwork.ozlabs.org; Wed, 04 Jan 2012 09:12:07 -0500 Received: from eggs.gnu.org ([140.186.70.92]:45831) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RiRZK-0000Rm-GX for qemu-devel@nongnu.org; Wed, 04 Jan 2012 09:12:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RiRZC-0001cb-T6 for qemu-devel@nongnu.org; Wed, 04 Jan 2012 09:11:54 -0500 Received: from mx1.redhat.com ([209.132.183.28]:7107) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RiRZC-0001cM-JR for qemu-devel@nongnu.org; Wed, 04 Jan 2012 09:11:46 -0500 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q04EBikb026661 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 4 Jan 2012 09:11:44 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id q04EBhiO003052; Wed, 4 Jan 2012 09:11:43 -0500 Received: from amt.cnet (vpn-9-110.rdu.redhat.com [10.11.9.110]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id q04EBgas019655; Wed, 4 Jan 2012 09:11:42 -0500 Received: from amt.cnet (amt.cnet [127.0.0.1]) by amt.cnet (Postfix) with ESMTP id 12335652352; Wed, 4 Jan 2012 12:10:52 -0200 (BRST) Received: (from marcelo@localhost) by amt.cnet (8.14.5/8.14.5/Submit) id q04EAo8H019580; Wed, 4 Jan 2012 12:10:50 -0200 Message-Id: <20120104140945.240455117@redhat.com> User-Agent: quilt/0.48-1 Date: Wed, 04 Jan 2012 12:08:55 -0200 From: Marcelo Tosatti To: stefanha@linux.vnet.ibm.com, kwolf@redhat.com, qemu-devel@nongnu.org References: <20120104140854.631720304@redhat.com> Content-Disposition: inline; filename=bdrv-stream-shared-base-helpers X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 209.132.183.28 Cc: Marcelo Tosatti Subject: [Qemu-devel] [patch 1/4] block: add bdrv_find_backing_image 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 Add bdrv_find_backing_image: given a BlockDriverState pointer, and an id, traverse the backing image chain to locate the id. Signed-off-by: Marcelo Tosatti Index: stefanha/block.c =================================================================== --- stefanha.orig/block.c +++ stefanha/block.c @@ -2580,6 +2580,24 @@ int bdrv_snapshot_load_tmp(BlockDriverSt return -ENOTSUP; } +BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *id) +{ + if (!bs->drv) { + return NULL; + } + + if (bs->backing_hd) { + if (strncmp(bs->backing_file, id, sizeof(bs->backing_file)) == 0) { + return bs->backing_hd; + } else { + return bdrv_find_backing_image(bs->backing_hd, id); + } + } + + return NULL; +} + + #define NB_SUFFIXES 4 char *get_human_readable_size(char *buf, int buf_size, int64_t size) Index: stefanha/block.h =================================================================== --- stefanha.orig/block.h +++ stefanha/block.h @@ -146,6 +146,7 @@ int coroutine_fn bdrv_co_writev(BlockDri int nb_sectors, QEMUIOVector *qiov); int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum); +BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *id); int bdrv_truncate(BlockDriverState *bs, int64_t offset); int64_t bdrv_getlength(BlockDriverState *bs); int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);