From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56135) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z5VSV-00050n-CW for qemu-devel@nongnu.org; Thu, 18 Jun 2015 04:46:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z5VST-0004IM-MG for qemu-devel@nongnu.org; Thu, 18 Jun 2015 04:46:03 -0400 From: Wen Congyang Date: Thu, 18 Jun 2015 16:49:18 +0800 Message-ID: <1434617361-17778-14-git-send-email-wency@cn.fujitsu.com> In-Reply-To: <1434617361-17778-1-git-send-email-wency@cn.fujitsu.com> References: <1434617361-17778-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [PATCH COLO-Block v6 13/16] quorum: implement block driver interfaces for block replication List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu devel , Fam Zheng , Max Reitz , Paolo Bonzini Cc: Kevin Wolf , qemu block , Lai Jiangshan , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , Gonglei , Stefan Hajnoczi , Yang Hongyang , zhanghailiang Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei --- block/quorum.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index 77e55b2..01cfac0 100644 --- a/block/quorum.c +++ b/block/quorum.c @@ -82,6 +82,8 @@ typedef struct BDRVQuorumState { */ QuorumReadPattern read_pattern; + + int replication_index; /* store which child supports block replication */ } BDRVQuorumState; typedef struct QuorumAIOCB QuorumAIOCB; @@ -945,6 +947,7 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, } g_free(opened); + s->replication_index = -1; goto exit; close_exit: @@ -1032,6 +1035,77 @@ static void quorum_refresh_filename(BlockDriverState *bs) bs->full_open_options = opts; } +static void quorum_start_replication(BlockDriverState *bs, ReplicationMode mode, + Error **errp) +{ + BDRVQuorumState *s = bs->opaque; + int count = 0, i, index; + Error *local_err = NULL; + + /* + * TODO: support REPLICATION_MODE_SECONDARY if we allow secondary + * QEMU becoming primary QEMU. + */ + if (mode != REPLICATION_MODE_PRIMARY) { + error_setg(errp, "Invalid parameter 'mode'"); + return; + } + + if (s->read_pattern != QUORUM_READ_PATTERN_FIFO) { + error_setg(errp, "Invalid parameter 'read pattern'"); + return; + } + + for (i = 0; i < s->num_children; i++) { + bdrv_start_replication(s->bs[i], mode, &local_err); + if (local_err) { + error_free(local_err); + local_err = NULL; + } else { + count++; + index = i; + } + } + + if (count == 0) { + /* No child supports block replication */ + error_setg(errp, "this feature or command is not currently supported"); + } else if (count > 1) { + for (i = 0; i < s->num_children; i++) { + bdrv_stop_replication(s->bs[i], false, NULL); + } + error_setg(errp, "too many children support block replication"); + } else { + s->replication_index = index; + } +} + +static void quorum_do_checkpoint(BlockDriverState *bs, Error **errp) +{ + BDRVQuorumState *s = bs->opaque; + + if (s->replication_index < 0) { + error_setg(errp, "Block replication is not started"); + return; + } + + bdrv_do_checkpoint(s->bs[s->replication_index], errp); +} + +static void quorum_stop_replication(BlockDriverState *bs, bool failover, + Error **errp) +{ + BDRVQuorumState *s = bs->opaque; + + if (s->replication_index < 0) { + error_setg(errp, "Block replication is not started"); + return; + } + + bdrv_stop_replication(s->bs[s->replication_index], failover, errp); + s->replication_index = -1; +} + static BlockDriver bdrv_quorum = { .format_name = "quorum", .protocol_name = "quorum", @@ -1055,6 +1129,10 @@ static BlockDriver bdrv_quorum = { .is_filter = true, .bdrv_recurse_is_first_non_filter = quorum_recurse_is_first_non_filter, + + .bdrv_start_replication = quorum_start_replication, + .bdrv_do_checkpoint = quorum_do_checkpoint, + .bdrv_stop_replication = quorum_stop_replication, }; static void bdrv_quorum_init(void) -- 2.4.3