From patchwork Wed Aug 7 03:00:12 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 265312 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 737502C00EE for ; Wed, 7 Aug 2013 13:03:00 +1000 (EST) Received: from localhost ([::1]:37780 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V6u1Z-0002xq-I7 for incoming@patchwork.ozlabs.org; Tue, 06 Aug 2013 23:02:57 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35053) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V6u0r-0002wF-U2 for qemu-devel@nongnu.org; Tue, 06 Aug 2013 23:02:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1V6u0g-0002En-Os for qemu-devel@nongnu.org; Tue, 06 Aug 2013 23:02:13 -0400 Received: from e28smtp06.in.ibm.com ([122.248.162.6]:38012) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V6u0f-0002EJ-SZ for qemu-devel@nongnu.org; Tue, 06 Aug 2013 23:02:02 -0400 Received: from /spool/local by e28smtp06.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Wed, 7 Aug 2013 08:22:54 +0530 Received: from d28relay02.in.ibm.com (d28relay02.in.ibm.com [9.184.220.59]) by d28dlp01.in.ibm.com (Postfix) with ESMTP id 90852E0054 for ; Wed, 7 Aug 2013 08:32:08 +0530 (IST) Received: from d28av02.in.ibm.com (d28av02.in.ibm.com [9.184.220.64]) by d28relay02.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r773385E38928630 for ; Wed, 7 Aug 2013 08:33:08 +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 r7731rNj003318 for ; Wed, 7 Aug 2013 13:01:53 +1000 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.222]) by d28av02.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r7730RCd028008; Wed, 7 Aug 2013 13:01:51 +1000 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Wed, 7 Aug 2013 11:00:12 +0800 Message-Id: <1375844419-7665-2-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1375844419-7665-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1375844419-7665-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13080702-9574-0000-0000-000009114A61 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 122.248.162.6 Cc: kwolf@redhat.com, phrdina@redhat.com, famz@redhat.com, Wenchao Xia , armbru@redhat.com, lcapitulino@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, dietmar@proxmox.com Subject: [Qemu-devel] [PATCH V7 1/8] snapshot: new function bdrv_snapshot_find_by_id_and_name() 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 To make it clear about id and name in searching, add this API to distinguish them. Caller can choose to search by id or name, *errp will be set only for exception. Some code are modified based on Pavel's patch. Signed-off-by: Wenchao Xia Signed-off-by: Pavel Hrdina Reviewed-by: Eric Blake --- block/snapshot.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++ include/block/snapshot.h | 6 ++++ 2 files changed, 79 insertions(+), 0 deletions(-) diff --git a/block/snapshot.c b/block/snapshot.c index 6c6d9de..481a3ee 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -48,6 +48,79 @@ int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, return ret; } +/** + * Look up an internal snapshot by @id and @name. + * @bs: block device to search + * @id: unique snapshot ID, or NULL + * @name: snapshot name, or NULL + * @sn_info: location to store information on the snapshot found + * @errp: location to store error, will be set only for exception + * + * This function will traverse snapshot list in @bs to search the matching + * one, @id and @name are the matching condition: + * If both @id and @name are specified, find the first one with id @id and + * name @name. + * If only @id is specified, find the first one with id @id. + * If only @name is specified, find the first one with name @name. + * if none is specified, abort(). + * + * Returns: true when a snapshot is found and @sn_info will be filled, false + * when error or not found. If all operation succeed but no matching one is + * found, @errp will NOT be set. + */ +bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs, + const char *id, + const char *name, + QEMUSnapshotInfo *sn_info, + Error **errp) +{ + QEMUSnapshotInfo *sn_tab, *sn; + int nb_sns, i; + bool ret = false; + + assert(id || name); + + nb_sns = bdrv_snapshot_list(bs, &sn_tab); + if (nb_sns < 0) { + error_setg_errno(errp, -nb_sns, "Failed to get a snapshot list"); + return false; + } else if (nb_sns == 0) { + return false; + } + + if (id && name) { + for (i = 0; i < nb_sns; i++) { + sn = &sn_tab[i]; + if (!strcmp(sn->id_str, id) && !strcmp(sn->name, name)) { + *sn_info = *sn; + ret = true; + break; + } + } + } else if (id) { + for (i = 0; i < nb_sns; i++) { + sn = &sn_tab[i]; + if (!strcmp(sn->id_str, id)) { + *sn_info = *sn; + ret = true; + break; + } + } + } else if (name) { + for (i = 0; i < nb_sns; i++) { + sn = &sn_tab[i]; + if (!strcmp(sn->name, name)) { + *sn_info = *sn; + ret = true; + break; + } + } + } + + g_free(sn_tab); + return ret; +} + int bdrv_can_snapshot(BlockDriverState *bs) { BlockDriver *drv = bs->drv; diff --git a/include/block/snapshot.h b/include/block/snapshot.h index eaf61f0..9d06dc1 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -26,6 +26,7 @@ #define SNAPSHOT_H #include "qemu-common.h" +#include "qapi/error.h" typedef struct QEMUSnapshotInfo { char id_str[128]; /* unique snapshot id */ @@ -40,6 +41,11 @@ typedef struct QEMUSnapshotInfo { int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, const char *name); +bool bdrv_snapshot_find_by_id_and_name(BlockDriverState *bs, + const char *id, + const char *name, + QEMUSnapshotInfo *sn_info, + Error **errp); int bdrv_can_snapshot(BlockDriverState *bs); int bdrv_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);