From patchwork Fri Jan 6 14:01:37 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 134646 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 13C351007D6 for ; Sat, 7 Jan 2012 01:35:45 +1100 (EST) Received: from localhost ([::1]:34797 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RjAOo-0003Bq-F2 for incoming@patchwork.ozlabs.org; Fri, 06 Jan 2012 09:04:02 -0500 Received: from eggs.gnu.org ([140.186.70.92]:43963) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RjAOG-0001lI-0w for qemu-devel@nongnu.org; Fri, 06 Jan 2012 09:03:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RjAOE-0001fy-Gr for qemu-devel@nongnu.org; Fri, 06 Jan 2012 09:03:27 -0500 Received: from e06smtp16.uk.ibm.com ([195.75.94.112]:57506) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RjAOE-0001fZ-5I for qemu-devel@nongnu.org; Fri, 06 Jan 2012 09:03:26 -0500 Received: from /spool/local by e06smtp16.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 6 Jan 2012 14:03:25 -0000 Received: from d06nrmr1307.portsmouth.uk.ibm.com ([9.149.38.129]) by e06smtp16.uk.ibm.com ([192.168.101.146]) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Fri, 6 Jan 2012 14:02:53 -0000 Received: from d06av08.portsmouth.uk.ibm.com (d06av08.portsmouth.uk.ibm.com [9.149.37.249]) by d06nrmr1307.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q06E2rGj2306132 for ; Fri, 6 Jan 2012 14:02:53 GMT Received: from d06av08.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av08.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q06E2qgQ030941 for ; Fri, 6 Jan 2012 14:02:52 GMT Received: from localhost (stefanha-thinkpad.manchester-maybrook.uk.ibm.com [9.174.219.31]) by d06av08.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id q06E2qsl030938; Fri, 6 Jan 2012 14:02:52 GMT From: Stefan Hajnoczi To: Date: Fri, 6 Jan 2012 14:01:37 +0000 Message-Id: <1325858501-25741-12-git-send-email-stefanha@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1325858501-25741-1-git-send-email-stefanha@linux.vnet.ibm.com> References: <1325858501-25741-1-git-send-email-stefanha@linux.vnet.ibm.com> x-cbid: 12010614-3548-0000-0000-00000097E931 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 195.75.94.112 Cc: Kevin Wolf , Marcelo Tosatti , Stefan Hajnoczi , Luiz Capitulino Subject: [Qemu-devel] [PATCH v4 11/15] 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 --- block.c | 17 +++++++++++++++++ block.h | 1 + 2 files changed, 18 insertions(+), 0 deletions(-) diff --git a/block.c b/block.c index 5bfaa3a..9b688a0 100644 --- a/block.c +++ b/block.c @@ -2614,6 +2614,23 @@ int bdrv_snapshot_load_tmp(BlockDriverState *bs, return -ENOTSUP; } +BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, const char *id) +{ + if (!bs->drv) { + return NULL; + } + + if (bs->backing_hd) { + if (strcmp(bs->backing_file, id) == 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) diff --git a/block.h b/block.h index 51b90c7..a1d9b56 100644 --- a/block.h +++ b/block.h @@ -153,6 +153,7 @@ int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num, int nb_sectors); 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);