From patchwork Mon Mar 11 11:23:08 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 226528 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 21A022C02A2 for ; Mon, 11 Mar 2013 22:28:07 +1100 (EST) Received: from localhost ([::1]:35400 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UF0th-0001RG-Ar for incoming@patchwork.ozlabs.org; Mon, 11 Mar 2013 07:28:05 -0400 Received: from eggs.gnu.org ([208.118.235.92]:52784) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UF0rI-0006gc-I1 for qemu-devel@nongnu.org; Mon, 11 Mar 2013 07:25:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UF0rF-0001W6-Sd for qemu-devel@nongnu.org; Mon, 11 Mar 2013 07:25:36 -0400 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:43584) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UF0rF-0001VU-8v for qemu-devel@nongnu.org; Mon, 11 Mar 2013 07:25:33 -0400 Received: from /spool/local by e28smtp09.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 11 Mar 2013 16:53:11 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id 251601258023 for ; Mon, 11 Mar 2013 16:56:30 +0530 (IST) Received: from d28av02.in.ibm.com (d28av02.in.ibm.com [9.184.220.64]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r2BBPO1g25559182 for ; Mon, 11 Mar 2013 16:55:24 +0530 Received: from d28av02.in.ibm.com (loopback [127.0.0.1]) by d28av02.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r2BBPQfm024969 for ; Mon, 11 Mar 2013 22:25:27 +1100 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.175] (may be forged)) by d28av02.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r2BBNRVA015564; Mon, 11 Mar 2013 22:25:24 +1100 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Mon, 11 Mar 2013 19:23:08 +0800 Message-Id: <1363000996-13221-7-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1363000996-13221-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1363000996-13221-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13031111-2674-0000-0000-00000822625D X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 122.248.162.9 Cc: kwolf@redhat.com, stefanha@gmail.com, armbru@redhat.com, lcapitulino@redhat.com, pbonzini@redhat.com, Wenchao Xia Subject: [Qemu-devel] [PATCH V9 06/14] block: add check for VM snapshot in bdrv_query_snapshot_info_list() 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 This patch adds a parameter to tell whether return valid snapshots for whole VM only. Signed-off-by: Wenchao Xia Reviewed-by: Eric Blake --- block/qapi.c | 42 ++++++++++++++++++++++++++++++++++++++++-- include/block/qapi.h | 1 + qemu-img.c | 3 ++- 3 files changed, 43 insertions(+), 3 deletions(-) diff --git a/block/qapi.c b/block/qapi.c index 2da28db..1d99f5a 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -12,11 +12,47 @@ */ #include "block/qapi.h" +#include "block/snapshot.h" #include "block/block_int.h" -/* return 0 on success, and @p_list will be set only on success. */ +/* + * check whether the snapshot is valid for whole vm. + * + * @sn: snapshot info to be checked. + * @bs: where @sn was found. + * + * return true if the snapshot is consistent for the VM. + */ +static bool snapshot_valid_for_vm(const QEMUSnapshotInfo *sn, + BlockDriverState *bs) +{ + BlockDriverState *bs1 = NULL; + QEMUSnapshotInfo s, *sn_info = &s; + int ret; + + /* Check logic is connected with load_vmstate(): + Only check the devices that can snapshot, other devices that can't + take snapshot, for example, readonly ones, will be ignored in + load_vmstate(). */ + while ((bs1 = bdrv_next(bs1))) { + if (bdrv_can_snapshot(bs1) && bs1 != bs) { + ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str, NULL); + if (ret < 0) { + return false; + } + } + } + return true; +} + +/* + * return 0 on success, and @p_list will be set only on success. If + * @vm_snapshot is true, limit the results to snapshots valid for the + * whole VM. + */ int bdrv_query_snapshot_info_list(BlockDriverState *bs, SnapshotInfoList **p_list, + bool vm_snapshot, Error **errp) { int i, sn_count; @@ -45,7 +81,9 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs, } for (i = 0; i < sn_count; i++) { - + if (vm_snapshot && !snapshot_valid_for_vm(&sn_tab[i], bs)) { + continue; + } info = g_new0(SnapshotInfo, 1); info->id = g_strdup(sn_tab[i].id_str); info->name = g_strdup(sn_tab[i].name); diff --git a/include/block/qapi.h b/include/block/qapi.h index 4b46165..092ad8c 100644 --- a/include/block/qapi.h +++ b/include/block/qapi.h @@ -19,6 +19,7 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs, SnapshotInfoList **p_list, + bool vm_snapshot, Error **errp); void bdrv_collect_image_info(BlockDriverState *bs, ImageInfo *info, diff --git a/qemu-img.c b/qemu-img.c index cb534c9..83532b1 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -1735,7 +1735,8 @@ static ImageInfoList *collect_image_info_list(const char *filename, info = g_new0(ImageInfo, 1); bdrv_collect_image_info(bs, info, filename); - if (!bdrv_query_snapshot_info_list(bs, &info->snapshots, NULL)) { + if (!bdrv_query_snapshot_info_list(bs, &info->snapshots, + false, NULL)) { info->has_snapshots = true; }