From patchwork Thu Mar 7 06:07:09 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wayne Xia X-Patchwork-Id: 225733 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 3AA6F2C033E for ; Thu, 7 Mar 2013 17:12:02 +1100 (EST) Received: from localhost ([::1]:43434 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UDU3c-0001Um-68 for incoming@patchwork.ozlabs.org; Thu, 07 Mar 2013 01:12:00 -0500 Received: from eggs.gnu.org ([208.118.235.92]:51022) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UDU1X-0006wn-0y for qemu-devel@nongnu.org; Thu, 07 Mar 2013 01:09:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UDU1V-0003xK-MC for qemu-devel@nongnu.org; Thu, 07 Mar 2013 01:09:50 -0500 Received: from e28smtp07.in.ibm.com ([122.248.162.7]:59416) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UDU1U-0003x5-RB for qemu-devel@nongnu.org; Thu, 07 Mar 2013 01:09:49 -0500 Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Thu, 7 Mar 2013 11:36:24 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id CF509394002D for ; Thu, 7 Mar 2013 11:39:42 +0530 (IST) Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r2769cGX20840620 for ; Thu, 7 Mar 2013 11:39:38 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r2769fcL029447 for ; Thu, 7 Mar 2013 17:09:42 +1100 Received: from RH63Wenchao (wenchaox.cn.ibm.com [9.115.122.208]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r2767TJj021188; Thu, 7 Mar 2013 17:09:37 +1100 From: Wenchao Xia To: qemu-devel@nongnu.org Date: Thu, 7 Mar 2013 14:07:09 +0800 Message-Id: <1362636445-7188-5-git-send-email-xiawenc@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1362636445-7188-1-git-send-email-xiawenc@linux.vnet.ibm.com> References: <1362636445-7188-1-git-send-email-xiawenc@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13030706-8878-0000-0000-0000062A27E9 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 122.248.162.7 Cc: kwolf@redhat.com, aliguori@us.ibm.com, capitulino@redhat.com, stefanha@gmail.com, armbru@redhat.com, pbonzini@redhat.com, Wenchao Xia Subject: [Qemu-devel] [PATCH V8 04/20] block: distinguish id and name in bdrv_find_snapshot() 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, the API was changed a bit to distinguish them. Caller can choose to search by id or name now. Searching will be done with higher priority of id. This function also return negative value from bdrv_snapshot_list() instead of -ENOENT on error. Signed-off-by: Wenchao Xia Reviewed-by: Eric Blake --- block/snapshot.c | 46 ++++++++++++++++++++++++++++++++++++++-------- include/block/snapshot.h | 2 +- savevm.c | 10 +++++----- 3 files changed, 44 insertions(+), 14 deletions(-) diff --git a/block/snapshot.c b/block/snapshot.c index 8de73b4..1449b3d 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -13,8 +13,20 @@ #include "block/snapshot.h" +/* + * Try find an internal snapshot with @id or @name, @id have higher priority + * in searching. + * + * @bs: block device to search on, must not be NULL. + * @sn_info: snapshot information to be filled in, must not be NULL. + * @id: snapshot id to search with, can be NULL. + * @name: snapshot name to search with, can be NULL. + * + * returns 0 and @sn_info is filled with related information if found, + * otherwise it returns negative value. + */ int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, - const char *name) + const char *id, const char *name) { QEMUSnapshotInfo *sn_tab, *sn; int nb_sns, i, ret; @@ -22,16 +34,34 @@ int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, ret = -ENOENT; nb_sns = bdrv_snapshot_list(bs, &sn_tab); if (nb_sns < 0) { - return ret; + return nb_sns; } - for (i = 0; i < nb_sns; i++) { - sn = &sn_tab[i]; - if (!strcmp(sn->id_str, name) || !strcmp(sn->name, name)) { - *sn_info = *sn; - ret = 0; - break; + + /* search by id */ + if (id) { + for (i = 0; i < nb_sns; i++) { + sn = &sn_tab[i]; + if (!strcmp(sn->id_str, id)) { + *sn_info = *sn; + ret = 0; + goto out; + } } } + + /* search by name */ + if (name) { + for (i = 0; i < nb_sns; i++) { + sn = &sn_tab[i]; + if (!strcmp(sn->name, name)) { + *sn_info = *sn; + ret = 0; + goto out; + } + } + } + + out: g_free(sn_tab); return ret; } diff --git a/include/block/snapshot.h b/include/block/snapshot.h index 369e047..71b8017 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -9,5 +9,5 @@ #include "block.h" int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, - const char *name); + const char *id, const char *name); #endif diff --git a/savevm.c b/savevm.c index 95f19ca..6557750 100644 --- a/savevm.c +++ b/savevm.c @@ -2073,7 +2073,7 @@ static int del_existing_snapshots(Monitor *mon, const char *name) bs = NULL; while ((bs = bdrv_next(bs))) { if (bdrv_can_snapshot(bs) && - bdrv_snapshot_find(bs, snapshot, name) >= 0) + bdrv_snapshot_find(bs, snapshot, name, name) >= 0) { ret = bdrv_snapshot_delete(bs, name); if (ret < 0) { @@ -2133,7 +2133,7 @@ void do_savevm(Monitor *mon, const QDict *qdict) sn->vm_clock_nsec = qemu_get_clock_ns(vm_clock); if (name) { - ret = bdrv_snapshot_find(bs, old_sn, name); + ret = bdrv_snapshot_find(bs, old_sn, name, name); if (ret >= 0) { pstrcpy(sn->name, sizeof(sn->name), old_sn->name); pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str); @@ -2224,7 +2224,7 @@ int load_vmstate(const char *name) } /* Don't even try to load empty VM states */ - ret = bdrv_snapshot_find(bs_vm_state, &sn, name); + ret = bdrv_snapshot_find(bs_vm_state, &sn, name, name); if (ret < 0) { return ret; } else if (sn.vm_state_size == 0) { @@ -2248,7 +2248,7 @@ int load_vmstate(const char *name) return -ENOTSUP; } - ret = bdrv_snapshot_find(bs, &sn, name); + ret = bdrv_snapshot_find(bs, &sn, name, name); if (ret < 0) { error_report("Device '%s' does not have the requested snapshot '%s'", bdrv_get_device_name(bs), name); @@ -2354,7 +2354,7 @@ void do_info_snapshots(Monitor *mon, const QDict *qdict) while ((bs1 = bdrv_next(bs1))) { if (bdrv_can_snapshot(bs1) && bs1 != bs) { - ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str); + ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str, NULL); if (ret < 0) { available = 0; break;