replication: Implement new driver for block replication
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com> Signed-off-by: Wang WeiWei <wangww.fnst@cn.fujitsu.com> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Gonglei <arei.gonglei@huawei.com> Message-id: 1469602913-20979-10-git-send-email-xiecl.fnst@cn.fujitsu.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Wen Congyang
Stefan Hajnoczi
parent
190b9a8b55
commit
29ff789060
@ -23,6 +23,7 @@ block-obj-$(CONFIG_LIBSSH2) += ssh.o
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block-obj-y += accounting.o dirty-bitmap.o
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block-obj-y += write-threshold.o
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block-obj-y += backup.o
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block-obj-$(CONFIG_REPLICATION) += replication.o
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block-obj-y += crypto.o
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659
block/replication.c
Normal file
659
block/replication.c
Normal file
@ -0,0 +1,659 @@
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/*
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* Replication Block filter
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 Intel Corporation
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* Copyright (c) 2016 FUJITSU LIMITED
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*
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* Author:
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* Wen Congyang <wency@cn.fujitsu.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "block/nbd.h"
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#include "block/blockjob.h"
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#include "block/block_int.h"
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#include "block/block_backup.h"
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#include "sysemu/block-backend.h"
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#include "qapi/error.h"
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#include "replication.h"
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typedef struct BDRVReplicationState {
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ReplicationMode mode;
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int replication_state;
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BdrvChild *active_disk;
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BdrvChild *hidden_disk;
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BdrvChild *secondary_disk;
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char *top_id;
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ReplicationState *rs;
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Error *blocker;
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int orig_hidden_flags;
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int orig_secondary_flags;
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int error;
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} BDRVReplicationState;
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enum {
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BLOCK_REPLICATION_NONE, /* block replication is not started */
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BLOCK_REPLICATION_RUNNING, /* block replication is running */
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BLOCK_REPLICATION_FAILOVER, /* failover is running in background */
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BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */
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BLOCK_REPLICATION_DONE, /* block replication is done */
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};
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static void replication_start(ReplicationState *rs, ReplicationMode mode,
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Error **errp);
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static void replication_do_checkpoint(ReplicationState *rs, Error **errp);
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static void replication_get_error(ReplicationState *rs, Error **errp);
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static void replication_stop(ReplicationState *rs, bool failover,
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Error **errp);
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#define REPLICATION_MODE "mode"
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#define REPLICATION_TOP_ID "top-id"
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static QemuOptsList replication_runtime_opts = {
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.name = "replication",
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.head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head),
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.desc = {
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{
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.name = REPLICATION_MODE,
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.type = QEMU_OPT_STRING,
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},
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{
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.name = REPLICATION_TOP_ID,
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.type = QEMU_OPT_STRING,
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},
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{ /* end of list */ }
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},
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};
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static ReplicationOps replication_ops = {
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.start = replication_start,
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.checkpoint = replication_do_checkpoint,
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.get_error = replication_get_error,
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.stop = replication_stop,
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};
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static int replication_open(BlockDriverState *bs, QDict *options,
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int flags, Error **errp)
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{
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int ret;
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BDRVReplicationState *s = bs->opaque;
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Error *local_err = NULL;
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QemuOpts *opts = NULL;
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const char *mode;
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const char *top_id;
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ret = -EINVAL;
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opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort);
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qemu_opts_absorb_qdict(opts, options, &local_err);
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if (local_err) {
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goto fail;
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}
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mode = qemu_opt_get(opts, REPLICATION_MODE);
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if (!mode) {
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error_setg(&local_err, "Missing the option mode");
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goto fail;
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}
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if (!strcmp(mode, "primary")) {
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s->mode = REPLICATION_MODE_PRIMARY;
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} else if (!strcmp(mode, "secondary")) {
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s->mode = REPLICATION_MODE_SECONDARY;
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top_id = qemu_opt_get(opts, REPLICATION_TOP_ID);
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s->top_id = g_strdup(top_id);
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if (!s->top_id) {
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error_setg(&local_err, "Missing the option top-id");
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goto fail;
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}
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} else {
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error_setg(&local_err,
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"The option mode's value should be primary or secondary");
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goto fail;
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}
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s->rs = replication_new(bs, &replication_ops);
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ret = 0;
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fail:
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qemu_opts_del(opts);
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error_propagate(errp, local_err);
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return ret;
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}
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static void replication_close(BlockDriverState *bs)
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{
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BDRVReplicationState *s = bs->opaque;
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if (s->replication_state == BLOCK_REPLICATION_RUNNING) {
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replication_stop(s->rs, false, NULL);
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}
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if (s->mode == REPLICATION_MODE_SECONDARY) {
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g_free(s->top_id);
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}
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replication_remove(s->rs);
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}
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static int64_t replication_getlength(BlockDriverState *bs)
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{
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return bdrv_getlength(bs->file->bs);
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}
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static int replication_get_io_status(BDRVReplicationState *s)
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{
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switch (s->replication_state) {
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case BLOCK_REPLICATION_NONE:
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return -EIO;
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case BLOCK_REPLICATION_RUNNING:
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return 0;
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case BLOCK_REPLICATION_FAILOVER:
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return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0;
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case BLOCK_REPLICATION_FAILOVER_FAILED:
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return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1;
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case BLOCK_REPLICATION_DONE:
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/*
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* active commit job completes, and active disk and secondary_disk
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* is swapped, so we can operate bs->file directly
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*/
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return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0;
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default:
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abort();
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}
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}
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static int replication_return_value(BDRVReplicationState *s, int ret)
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{
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if (s->mode == REPLICATION_MODE_SECONDARY) {
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return ret;
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}
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if (ret < 0) {
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s->error = ret;
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ret = 0;
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}
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return ret;
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}
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static coroutine_fn int replication_co_readv(BlockDriverState *bs,
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int64_t sector_num,
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int remaining_sectors,
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QEMUIOVector *qiov)
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{
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BDRVReplicationState *s = bs->opaque;
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BdrvChild *child = s->secondary_disk;
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BlockJob *job = NULL;
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CowRequest req;
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int ret;
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if (s->mode == REPLICATION_MODE_PRIMARY) {
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/* We only use it to forward primary write requests */
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return -EIO;
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}
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ret = replication_get_io_status(s);
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if (ret < 0) {
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return ret;
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}
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if (child && child->bs) {
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job = child->bs->job;
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}
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if (job) {
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backup_wait_for_overlapping_requests(child->bs->job, sector_num,
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remaining_sectors);
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backup_cow_request_begin(&req, child->bs->job, sector_num,
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remaining_sectors);
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ret = bdrv_co_readv(bs->file, sector_num, remaining_sectors,
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qiov);
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backup_cow_request_end(&req);
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goto out;
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}
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ret = bdrv_co_readv(bs->file, sector_num, remaining_sectors, qiov);
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out:
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return replication_return_value(s, ret);
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}
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static coroutine_fn int replication_co_writev(BlockDriverState *bs,
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int64_t sector_num,
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int remaining_sectors,
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QEMUIOVector *qiov)
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{
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BDRVReplicationState *s = bs->opaque;
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QEMUIOVector hd_qiov;
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uint64_t bytes_done = 0;
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BdrvChild *top = bs->file;
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BdrvChild *base = s->secondary_disk;
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BdrvChild *target;
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int ret, n;
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ret = replication_get_io_status(s);
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if (ret < 0) {
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goto out;
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}
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if (ret == 0) {
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ret = bdrv_co_writev(top, sector_num,
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remaining_sectors, qiov);
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return replication_return_value(s, ret);
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}
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/*
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* Failover failed, only write to active disk if the sectors
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* have already been allocated in active disk/hidden disk.
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*/
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qemu_iovec_init(&hd_qiov, qiov->niov);
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while (remaining_sectors > 0) {
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ret = bdrv_is_allocated_above(top->bs, base->bs, sector_num,
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remaining_sectors, &n);
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if (ret < 0) {
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goto out1;
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}
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_concat(&hd_qiov, qiov, bytes_done, n * BDRV_SECTOR_SIZE);
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target = ret ? top : base;
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ret = bdrv_co_writev(target, sector_num, n, &hd_qiov);
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if (ret < 0) {
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goto out1;
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}
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remaining_sectors -= n;
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sector_num += n;
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bytes_done += n * BDRV_SECTOR_SIZE;
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}
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out1:
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qemu_iovec_destroy(&hd_qiov);
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out:
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return ret;
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}
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static bool replication_recurse_is_first_non_filter(BlockDriverState *bs,
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BlockDriverState *candidate)
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{
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return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate);
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}
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static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp)
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{
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Error *local_err = NULL;
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int ret;
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if (!s->secondary_disk->bs->job) {
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error_setg(errp, "Backup job was cancelled unexpectedly");
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return;
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}
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backup_do_checkpoint(s->secondary_disk->bs->job, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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return;
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}
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ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs);
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if (ret < 0) {
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error_setg(errp, "Cannot make active disk empty");
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return;
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}
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ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs);
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if (ret < 0) {
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error_setg(errp, "Cannot make hidden disk empty");
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return;
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}
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}
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static void reopen_backing_file(BDRVReplicationState *s, bool writable,
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Error **errp)
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{
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BlockReopenQueue *reopen_queue = NULL;
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int orig_hidden_flags, orig_secondary_flags;
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int new_hidden_flags, new_secondary_flags;
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Error *local_err = NULL;
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if (writable) {
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orig_hidden_flags = s->orig_hidden_flags =
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bdrv_get_flags(s->hidden_disk->bs);
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new_hidden_flags = (orig_hidden_flags | BDRV_O_RDWR) &
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~BDRV_O_INACTIVE;
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orig_secondary_flags = s->orig_secondary_flags =
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bdrv_get_flags(s->secondary_disk->bs);
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new_secondary_flags = (orig_secondary_flags | BDRV_O_RDWR) &
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~BDRV_O_INACTIVE;
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} else {
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orig_hidden_flags = (s->orig_hidden_flags | BDRV_O_RDWR) &
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~BDRV_O_INACTIVE;
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new_hidden_flags = s->orig_hidden_flags;
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orig_secondary_flags = (s->orig_secondary_flags | BDRV_O_RDWR) &
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~BDRV_O_INACTIVE;
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new_secondary_flags = s->orig_secondary_flags;
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}
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if (orig_hidden_flags != new_hidden_flags) {
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reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, NULL,
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new_hidden_flags);
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}
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if (!(orig_secondary_flags & BDRV_O_RDWR)) {
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reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs,
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NULL, new_secondary_flags);
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}
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if (reopen_queue) {
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bdrv_reopen_multiple(reopen_queue, &local_err);
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error_propagate(errp, local_err);
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}
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}
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static void backup_job_cleanup(BDRVReplicationState *s)
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{
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BlockDriverState *top_bs;
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top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL);
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if (!top_bs) {
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return;
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}
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bdrv_op_unblock_all(top_bs, s->blocker);
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error_free(s->blocker);
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reopen_backing_file(s, false, NULL);
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}
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static void backup_job_completed(void *opaque, int ret)
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{
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BDRVReplicationState *s = opaque;
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if (s->replication_state != BLOCK_REPLICATION_FAILOVER) {
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/* The backup job is cancelled unexpectedly */
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s->error = -EIO;
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}
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backup_job_cleanup(s);
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}
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static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs)
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{
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BdrvChild *child;
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/* The bs itself is the top_bs */
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if (top_bs == bs) {
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return true;
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}
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/* Iterate over top_bs's children */
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QLIST_FOREACH(child, &top_bs->children, next) {
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if (child->bs == bs || check_top_bs(child->bs, bs)) {
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return true;
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}
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}
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return false;
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}
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static void replication_start(ReplicationState *rs, ReplicationMode mode,
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Error **errp)
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{
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BlockDriverState *bs = rs->opaque;
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BDRVReplicationState *s;
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BlockDriverState *top_bs;
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int64_t active_length, hidden_length, disk_length;
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AioContext *aio_context;
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Error *local_err = NULL;
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aio_context = bdrv_get_aio_context(bs);
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aio_context_acquire(aio_context);
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s = bs->opaque;
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if (s->replication_state != BLOCK_REPLICATION_NONE) {
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error_setg(errp, "Block replication is running or done");
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aio_context_release(aio_context);
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return;
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}
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if (s->mode != mode) {
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error_setg(errp, "The parameter mode's value is invalid, needs %d,"
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" but got %d", s->mode, mode);
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aio_context_release(aio_context);
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return;
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}
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switch (s->mode) {
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case REPLICATION_MODE_PRIMARY:
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break;
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case REPLICATION_MODE_SECONDARY:
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s->active_disk = bs->file;
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if (!s->active_disk || !s->active_disk->bs ||
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!s->active_disk->bs->backing) {
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error_setg(errp, "Active disk doesn't have backing file");
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aio_context_release(aio_context);
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return;
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}
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s->hidden_disk = s->active_disk->bs->backing;
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if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) {
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error_setg(errp, "Hidden disk doesn't have backing file");
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aio_context_release(aio_context);
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return;
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}
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s->secondary_disk = s->hidden_disk->bs->backing;
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if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) {
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error_setg(errp, "The secondary disk doesn't have block backend");
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aio_context_release(aio_context);
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return;
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}
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/* verify the length */
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active_length = bdrv_getlength(s->active_disk->bs);
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hidden_length = bdrv_getlength(s->hidden_disk->bs);
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disk_length = bdrv_getlength(s->secondary_disk->bs);
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if (active_length < 0 || hidden_length < 0 || disk_length < 0 ||
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active_length != hidden_length || hidden_length != disk_length) {
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error_setg(errp, "Active disk, hidden disk, secondary disk's length"
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" are not the same");
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aio_context_release(aio_context);
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return;
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}
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||||
|
||||
if (!s->active_disk->bs->drv->bdrv_make_empty ||
|
||||
!s->hidden_disk->bs->drv->bdrv_make_empty) {
|
||||
error_setg(errp,
|
||||
"Active disk or hidden disk doesn't support make_empty");
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
|
||||
/* reopen the backing file in r/w mode */
|
||||
reopen_backing_file(s, true, &local_err);
|
||||
if (local_err) {
|
||||
error_propagate(errp, local_err);
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
|
||||
/* start backup job now */
|
||||
error_setg(&s->blocker,
|
||||
"Block device is in use by internal backup job");
|
||||
|
||||
top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL);
|
||||
if (!top_bs || !bdrv_is_root_node(top_bs) ||
|
||||
!check_top_bs(top_bs, bs)) {
|
||||
error_setg(errp, "No top_bs or it is invalid");
|
||||
reopen_backing_file(s, false, NULL);
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
bdrv_op_block_all(top_bs, s->blocker);
|
||||
bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker);
|
||||
|
||||
backup_start("replication-backup", s->secondary_disk->bs,
|
||||
s->hidden_disk->bs, 0, MIRROR_SYNC_MODE_NONE, NULL, false,
|
||||
BLOCKDEV_ON_ERROR_REPORT, BLOCKDEV_ON_ERROR_REPORT,
|
||||
backup_job_completed, s, NULL, &local_err);
|
||||
if (local_err) {
|
||||
error_propagate(errp, local_err);
|
||||
backup_job_cleanup(s);
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
aio_context_release(aio_context);
|
||||
abort();
|
||||
}
|
||||
|
||||
s->replication_state = BLOCK_REPLICATION_RUNNING;
|
||||
|
||||
if (s->mode == REPLICATION_MODE_SECONDARY) {
|
||||
secondary_do_checkpoint(s, errp);
|
||||
}
|
||||
|
||||
s->error = 0;
|
||||
aio_context_release(aio_context);
|
||||
}
|
||||
|
||||
static void replication_do_checkpoint(ReplicationState *rs, Error **errp)
|
||||
{
|
||||
BlockDriverState *bs = rs->opaque;
|
||||
BDRVReplicationState *s;
|
||||
AioContext *aio_context;
|
||||
|
||||
aio_context = bdrv_get_aio_context(bs);
|
||||
aio_context_acquire(aio_context);
|
||||
s = bs->opaque;
|
||||
|
||||
if (s->mode == REPLICATION_MODE_SECONDARY) {
|
||||
secondary_do_checkpoint(s, errp);
|
||||
}
|
||||
aio_context_release(aio_context);
|
||||
}
|
||||
|
||||
static void replication_get_error(ReplicationState *rs, Error **errp)
|
||||
{
|
||||
BlockDriverState *bs = rs->opaque;
|
||||
BDRVReplicationState *s;
|
||||
AioContext *aio_context;
|
||||
|
||||
aio_context = bdrv_get_aio_context(bs);
|
||||
aio_context_acquire(aio_context);
|
||||
s = bs->opaque;
|
||||
|
||||
if (s->replication_state != BLOCK_REPLICATION_RUNNING) {
|
||||
error_setg(errp, "Block replication is not running");
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
|
||||
if (s->error) {
|
||||
error_setg(errp, "I/O error occurred");
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
aio_context_release(aio_context);
|
||||
}
|
||||
|
||||
static void replication_done(void *opaque, int ret)
|
||||
{
|
||||
BlockDriverState *bs = opaque;
|
||||
BDRVReplicationState *s = bs->opaque;
|
||||
|
||||
if (ret == 0) {
|
||||
s->replication_state = BLOCK_REPLICATION_DONE;
|
||||
|
||||
/* refresh top bs's filename */
|
||||
bdrv_refresh_filename(bs);
|
||||
s->active_disk = NULL;
|
||||
s->secondary_disk = NULL;
|
||||
s->hidden_disk = NULL;
|
||||
s->error = 0;
|
||||
} else {
|
||||
s->replication_state = BLOCK_REPLICATION_FAILOVER_FAILED;
|
||||
s->error = -EIO;
|
||||
}
|
||||
}
|
||||
|
||||
static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
|
||||
{
|
||||
BlockDriverState *bs = rs->opaque;
|
||||
BDRVReplicationState *s;
|
||||
AioContext *aio_context;
|
||||
|
||||
aio_context = bdrv_get_aio_context(bs);
|
||||
aio_context_acquire(aio_context);
|
||||
s = bs->opaque;
|
||||
|
||||
if (s->replication_state != BLOCK_REPLICATION_RUNNING) {
|
||||
error_setg(errp, "Block replication is not running");
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (s->mode) {
|
||||
case REPLICATION_MODE_PRIMARY:
|
||||
s->replication_state = BLOCK_REPLICATION_DONE;
|
||||
s->error = 0;
|
||||
break;
|
||||
case REPLICATION_MODE_SECONDARY:
|
||||
/*
|
||||
* This BDS will be closed, and the job should be completed
|
||||
* before the BDS is closed, because we will access hidden
|
||||
* disk, secondary disk in backup_job_completed().
|
||||
*/
|
||||
if (s->secondary_disk->bs->job) {
|
||||
block_job_cancel_sync(s->secondary_disk->bs->job);
|
||||
}
|
||||
|
||||
if (!failover) {
|
||||
secondary_do_checkpoint(s, errp);
|
||||
s->replication_state = BLOCK_REPLICATION_DONE;
|
||||
aio_context_release(aio_context);
|
||||
return;
|
||||
}
|
||||
|
||||
s->replication_state = BLOCK_REPLICATION_FAILOVER;
|
||||
commit_active_start("replication-commit", s->active_disk->bs,
|
||||
s->secondary_disk->bs, 0, BLOCKDEV_ON_ERROR_REPORT,
|
||||
replication_done,
|
||||
bs, errp, true);
|
||||
break;
|
||||
default:
|
||||
aio_context_release(aio_context);
|
||||
abort();
|
||||
}
|
||||
aio_context_release(aio_context);
|
||||
}
|
||||
|
||||
BlockDriver bdrv_replication = {
|
||||
.format_name = "replication",
|
||||
.protocol_name = "replication",
|
||||
.instance_size = sizeof(BDRVReplicationState),
|
||||
|
||||
.bdrv_open = replication_open,
|
||||
.bdrv_close = replication_close,
|
||||
|
||||
.bdrv_getlength = replication_getlength,
|
||||
.bdrv_co_readv = replication_co_readv,
|
||||
.bdrv_co_writev = replication_co_writev,
|
||||
|
||||
.is_filter = true,
|
||||
.bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter,
|
||||
|
||||
.has_variable_length = true,
|
||||
};
|
||||
|
||||
static void bdrv_replication_init(void)
|
||||
{
|
||||
bdrv_register(&bdrv_replication);
|
||||
}
|
||||
|
||||
block_init(bdrv_replication_init);
|
||||
Loading…
Reference in New Issue
Block a user