From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37458) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZtZKG-0004Yy-Nr for qemu-devel@nongnu.org; Tue, 03 Nov 2015 06:00:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZtZKB-0002k8-MO for qemu-devel@nongnu.org; Tue, 03 Nov 2015 06:00:28 -0500 From: Wen Congyang Date: Tue, 3 Nov 2015 18:58:46 +0800 Message-ID: <1446548329-17475-10-git-send-email-wency@cn.fujitsu.com> In-Reply-To: <1446548329-17475-1-git-send-email-wency@cn.fujitsu.com> References: <1446548329-17475-1-git-send-email-wency@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [PATCH v11 09/12] 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 , Stefan Hajnoczi Cc: Kevin Wolf , qemu block , Jiang Yunhong , Dong Eddie , "Dr. David Alan Gilbert" , "Michael R. Hines" , Gonglei , zhanghailiang Signed-off-by: Wen Congyang Signed-off-by: zhanghailiang Signed-off-by: Gonglei Reviewed-by: Alberto Garcia --- block/quorum.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/block/quorum.c b/block/quorum.c index 79afb20..7cb5f91 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; @@ -943,6 +945,7 @@ static int quorum_open(BlockDriverState *bs, QDict *options, int flags, } g_free(opened); + s->replication_index = -1; goto exit; close_exit: @@ -1083,6 +1086,77 @@ 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, "The replication mode for quorum should be 'primary'"); + return; + } + + if (s->read_pattern != QUORUM_READ_PATTERN_FIFO) { + error_setg(errp, "Block replication needs read pattern 'fifo'"); + return; + } + + for (i = 0; i < s->num_children; i++) { + bdrv_start_replication(s->children[i]->bs, mode, &local_err); + if (local_err) { + error_free(local_err); + local_err = NULL; + } else { + count++; + index = i; + } + } + + if (count == 0) { + error_setg(errp, "No child supports block replication"); + } else if (count > 1) { + for (i = 0; i < s->num_children; i++) { + bdrv_stop_replication(s->children[i]->bs, 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 running"); + return; + } + + bdrv_do_checkpoint(s->children[s->replication_index]->bs, 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 running"); + return; + } + + bdrv_stop_replication(s->children[s->replication_index]->bs, failover, + errp); + s->replication_index = -1; +} + static BlockDriver bdrv_quorum = { .format_name = "quorum", .protocol_name = "quorum", @@ -1109,6 +1183,10 @@ 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