From patchwork Thu Jan 26 16:38:08 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 138045 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (unknown [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 4B2A91007D3 for ; Fri, 27 Jan 2012 07:53:33 +1100 (EST) Received: from localhost ([::1]:33154 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RqSIu-0001Uh-Cp for incoming@patchwork.ozlabs.org; Thu, 26 Jan 2012 11:36:04 -0500 Received: from eggs.gnu.org ([140.186.70.92]:60552) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RqSID-0000Xf-4N for qemu-devel@nongnu.org; Thu, 26 Jan 2012 11:35:25 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RqSI2-0003S5-G4 for qemu-devel@nongnu.org; Thu, 26 Jan 2012 11:35:20 -0500 Received: from mx1.redhat.com ([209.132.183.28]:1208) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RqSI2-0003Ru-93 for qemu-devel@nongnu.org; Thu, 26 Jan 2012 11:35:10 -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 q0QGZ8KB017822 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 26 Jan 2012 11:35:08 -0500 Received: from dhcp-5-188.str.redhat.com (dhcp-5-175.str.redhat.com [10.32.5.175]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id q0QGYoY2031205; Thu, 26 Jan 2012 11:35:07 -0500 From: Kevin Wolf To: anthony@codemonkey.ws Date: Thu, 26 Jan 2012 17:38:08 +0100 Message-Id: <1327595896-19623-15-git-send-email-kwolf@redhat.com> In-Reply-To: <1327595896-19623-1-git-send-email-kwolf@redhat.com> References: <1327595896-19623-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 209.132.183.28 Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [Qemu-devel] [PATCH 14/22] 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 From: Marcelo Tosatti 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 Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block.c | 18 ++++++++++++++++++ block.h | 2 ++ 2 files changed, 20 insertions(+), 0 deletions(-) diff --git a/block.c b/block.c index 2baac95..3621d11 100644 --- a/block.c +++ b/block.c @@ -2595,6 +2595,24 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs, return -ENOTSUP; } +BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, + const char *backing_file) +{ + if (!bs->drv) { + return NULL; + } + + if (bs->backing_hd) { + if (strcmp(bs->backing_file, backing_file) == 0) { + return bs->backing_hd; + } else { + return bdrv_find_backing_image(bs->backing_hd, backing_file); + } + } + + return NULL; +} + #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 a3b0b80..cae289b 100644 --- a/block.h +++ b/block.h @@ -148,6 +148,8 @@ int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, 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 *backing_file); int bdrv_truncate(BlockDriverState *bs, int64_t offset); int64_t bdrv_getlength(BlockDriverState *bs); int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);