From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40065) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a2CKR-0003TN-S5 for qemu-devel@nongnu.org; Fri, 27 Nov 2015 01:16:23 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a2CKQ-0002pz-Gg for qemu-devel@nongnu.org; Fri, 27 Nov 2015 01:16:19 -0500 From: Wen Congyang Date: Fri, 27 Nov 2015 14:14:52 +0800 Message-ID: <1448604896-15378-7-git-send-email-wency@cn.fujitsu.com> In-Reply-To: <1448604896-15378-1-git-send-email-wency@cn.fujitsu.com> References: <1448604896-15378-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [Patch v12 06/10] Add new block driver interfaces to control block replication List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu devel , Fam Zheng , Max Reitz , Paolo Bonzini , Kevin Wolf , Stefan Hajnoczi Cc: qemu block , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , "Michael R. Hines" , Luiz Capitulino , Gonglei , Michael Roth , zhanghailiang Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei Cc: Luiz Capitulino Cc: Michael Roth Reviewed-by: Paolo Bonzini --- block.c | 43 +++++++++++++++++++++++++++++++++++++++++++ include/block/block.h | 5 +++++ include/block/block_int.h | 14 ++++++++++++++ qapi/block-core.json | 13 +++++++++++++ 4 files changed, 75 insertions(+) diff --git a/block.c b/block.c index 0a0468f..213bee8 100644 --- a/block.c +++ b/block.c @@ -4390,3 +4390,46 @@ void bdrv_del_child(BlockDriverState *parent_bs, BlockDriverState *child_bs, parent_bs->drv->bdrv_del_child(parent_bs, child_bs, errp); } + +void bdrv_start_replication(BlockDriverState *bs, ReplicationMode mode, + Error **errp) +{ + BlockDriver *drv = bs->drv; + + if (drv && drv->bdrv_start_replication) { + drv->bdrv_start_replication(bs, mode, errp); + } else if (bs->file) { + bdrv_start_replication(bs->file->bs, mode, errp); + } else { + error_setg(errp, "The BDS %s doesn't support starting block" + " replication", bs->filename); + } +} + +void bdrv_do_checkpoint(BlockDriverState *bs, Error **errp) +{ + BlockDriver *drv = bs->drv; + + if (drv && drv->bdrv_do_checkpoint) { + drv->bdrv_do_checkpoint(bs, errp); + } else if (bs->file) { + bdrv_do_checkpoint(bs->file->bs, errp); + } else { + error_setg(errp, "The BDS %s doesn't support block checkpoint", + bs->filename); + } +} + +void bdrv_stop_replication(BlockDriverState *bs, bool failover, Error **errp) +{ + BlockDriver *drv = bs->drv; + + if (drv && drv->bdrv_stop_replication) { + drv->bdrv_stop_replication(bs, failover, errp); + } else if (bs->file) { + bdrv_stop_replication(bs->file->bs, failover, errp); + } else { + error_setg(errp, "The BDS %s doesn't support stopping block" + " replication", bs->filename); + } +} diff --git a/include/block/block.h b/include/block/block.h index 1d3b9c6..cd39d50 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -648,4 +648,9 @@ void bdrv_add_child(BlockDriverState *parent, BlockDriverState *child, void bdrv_del_child(BlockDriverState *parent, BlockDriverState *child, Error **errp); +void bdrv_start_replication(BlockDriverState *bs, ReplicationMode mode, + Error **errp); +void bdrv_do_checkpoint(BlockDriverState *bs, Error **errp); +void bdrv_stop_replication(BlockDriverState *bs, bool failover, Error **errp); + #endif diff --git a/include/block/block_int.h b/include/block/block_int.h index 1f56046..a6aba8b 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -307,6 +307,20 @@ struct BlockDriver { void (*bdrv_del_child)(BlockDriverState *parent, BlockDriverState *child, Error **errp); + void (*bdrv_start_replication)(BlockDriverState *bs, ReplicationMode mode, + Error **errp); + /* Drop Disk buffer when doing checkpoint. */ + void (*bdrv_do_checkpoint)(BlockDriverState *bs, Error **errp); + /* + * After failover, we should flush Disk buffer into secondary disk + * and stop block replication. + * + * If the guest is shutdown, we should drop Disk buffer and stop + * block representation. + */ + void (*bdrv_stop_replication)(BlockDriverState *bs, bool failover, + Error **errp); + QLIST_ENTRY(BlockDriver) list; }; diff --git a/qapi/block-core.json b/qapi/block-core.json index feb8da2..2c6bd3f 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1925,6 +1925,19 @@ '*read-pattern': 'QuorumReadPattern' } } ## +# @ReplicationMode +# +# An enumeration of replication modes. +# +# @primary: Primary mode, the vm's state will be sent to secondary QEMU. +# +# @secondary: Secondary mode, receive the vm's state from primary QEMU. +# +# Since: 2.5 +## +{ 'enum' : 'ReplicationMode', 'data' : [ 'primary', 'secondary' ] } + +## # @BlockdevOptions # # Options for creating a block device. -- 2.5.0