From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:39176) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RnWkl-0000Xw-Fp for qemu-devel@nongnu.org; Wed, 18 Jan 2012 09:45:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RnWkD-00086K-0Q for qemu-devel@nongnu.org; Wed, 18 Jan 2012 09:44:18 -0500 Received: from e06smtp12.uk.ibm.com ([195.75.94.108]:34809) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RnWkC-0007uN-PT for qemu-devel@nongnu.org; Wed, 18 Jan 2012 09:44:08 -0500 Received: from /spool/local by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 18 Jan 2012 14:42:22 -0000 Received: from d06av03.portsmouth.uk.ibm.com (d06av03.portsmouth.uk.ibm.com [9.149.37.213]) by d06nrmr1507.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q0IEgK082109624 for ; Wed, 18 Jan 2012 14:42:20 GMT Received: from d06av03.portsmouth.uk.ibm.com (localhost.localdomain [127.0.0.1]) by d06av03.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q0IEgJfH020037 for ; Wed, 18 Jan 2012 07:42:19 -0700 From: Stefan Hajnoczi Date: Wed, 18 Jan 2012 14:40:51 +0000 Message-Id: <1326897655-2799-13-git-send-email-stefanha@linux.vnet.ibm.com> In-Reply-To: <1326897655-2799-1-git-send-email-stefanha@linux.vnet.ibm.com> References: <1326897655-2799-1-git-send-email-stefanha@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH v6 12/16] block: add bdrv_find_backing_image List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Kevin Wolf , Marcelo Tosatti , Stefan Hajnoczi 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 | 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); -- 1.7.8.3