bf8e925eb5
For now, all callers pass 0 and no callee evaluates this value. Later patches will change both. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20200513110544.176672-7-mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
754 lines
22 KiB
C
754 lines
22 KiB
C
/*
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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/module.h"
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#include "qemu/option.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 "qapi/qmp/qdict.h"
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#include "replication.h"
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typedef 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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} ReplicationStage;
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typedef struct BDRVReplicationState {
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ReplicationMode mode;
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ReplicationStage stage;
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BdrvChild *active_disk;
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BlockJob *commit_job;
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BdrvChild *hidden_disk;
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BdrvChild *secondary_disk;
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BlockJob *backup_job;
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char *top_id;
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ReplicationState *rs;
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Error *blocker;
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bool orig_hidden_read_only;
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bool orig_secondary_read_only;
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int error;
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} BDRVReplicationState;
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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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bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 0,
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false, errp);
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if (!bs->file) {
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return -EINVAL;
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}
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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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top_id = qemu_opt_get(opts, REPLICATION_TOP_ID);
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if (top_id) {
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error_setg(&local_err, "The primary side does not support option top-id");
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goto fail;
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}
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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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Job *commit_job;
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if (s->stage == BLOCK_REPLICATION_RUNNING) {
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replication_stop(s->rs, false, NULL);
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}
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if (s->stage == BLOCK_REPLICATION_FAILOVER) {
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commit_job = &s->commit_job->job;
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assert(commit_job->aio_context == qemu_get_current_aio_context());
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job_cancel_sync(commit_job);
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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 void replication_child_perm(BlockDriverState *bs, BdrvChild *c,
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const BdrvChildClass *child_class,
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BdrvChildRole role,
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BlockReopenQueue *reopen_queue,
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uint64_t perm, uint64_t shared,
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uint64_t *nperm, uint64_t *nshared)
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{
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*nperm = BLK_PERM_CONSISTENT_READ;
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if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) {
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*nperm |= BLK_PERM_WRITE;
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}
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*nshared = BLK_PERM_CONSISTENT_READ
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| BLK_PERM_WRITE
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| BLK_PERM_WRITE_UNCHANGED;
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return;
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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->stage) {
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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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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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ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE,
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remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0);
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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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int flags)
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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;
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int64_t n;
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assert(!flags);
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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_pwritev(top, sector_num * BDRV_SECTOR_SIZE,
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remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0);
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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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int64_t count;
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ret = bdrv_is_allocated_above(top->bs, base->bs, false,
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sector_num * BDRV_SECTOR_SIZE,
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remaining_sectors * BDRV_SECTOR_SIZE,
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&count);
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if (ret < 0) {
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goto out1;
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}
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assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE));
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n = count >> BDRV_SECTOR_BITS;
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qemu_iovec_reset(&hd_qiov);
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qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count);
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target = ret ? top : base;
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ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE,
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n * BDRV_SECTOR_SIZE, &hd_qiov, 0);
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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 += count;
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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 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->backup_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->backup_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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if (!s->active_disk->bs->drv) {
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error_setg(errp, "Active disk %s is ejected",
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s->active_disk->bs->node_name);
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return;
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}
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ret = bdrv_make_empty(s->active_disk, errp);
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if (ret < 0) {
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return;
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}
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if (!s->hidden_disk->bs->drv) {
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error_setg(errp, "Hidden disk %s is ejected",
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s->hidden_disk->bs->node_name);
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return;
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}
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BlockBackend *blk = blk_new(qemu_get_current_aio_context(),
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BLK_PERM_WRITE, BLK_PERM_ALL);
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blk_insert_bs(blk, s->hidden_disk->bs, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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blk_unref(blk);
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return;
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}
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ret = blk_make_empty(blk, errp);
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blk_unref(blk);
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if (ret < 0) {
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return;
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}
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}
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/* This function is supposed to be called twice:
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* first with writable = true, then with writable = false.
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* The first call puts s->hidden_disk and s->secondary_disk in
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* r/w mode, and the second puts them back in their original state.
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*/
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static void reopen_backing_file(BlockDriverState *bs, bool writable,
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Error **errp)
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{
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BDRVReplicationState *s = bs->opaque;
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BlockReopenQueue *reopen_queue = NULL;
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Error *local_err = NULL;
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if (writable) {
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s->orig_hidden_read_only = bdrv_is_read_only(s->hidden_disk->bs);
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s->orig_secondary_read_only = bdrv_is_read_only(s->secondary_disk->bs);
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}
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bdrv_subtree_drained_begin(s->hidden_disk->bs);
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bdrv_subtree_drained_begin(s->secondary_disk->bs);
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if (s->orig_hidden_read_only) {
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QDict *opts = qdict_new();
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qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable);
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reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs,
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opts, true);
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}
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if (s->orig_secondary_read_only) {
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QDict *opts = qdict_new();
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qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable);
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reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs,
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opts, true);
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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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bdrv_subtree_drained_end(s->hidden_disk->bs);
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bdrv_subtree_drained_end(s->secondary_disk->bs);
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}
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static void backup_job_cleanup(BlockDriverState *bs)
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{
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BDRVReplicationState *s = bs->opaque;
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BlockDriverState *top_bs;
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s->backup_job = NULL;
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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(bs, 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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BlockDriverState *bs = opaque;
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BDRVReplicationState *s = bs->opaque;
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if (s->stage != 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(bs);
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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->stage == BLOCK_REPLICATION_DONE ||
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s->stage == BLOCK_REPLICATION_FAILOVER) {
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/*
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* This case happens when a secondary is promoted to primary.
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* Ignore the request because the secondary side of replication
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* doesn't have to do anything anymore.
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*/
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aio_context_release(aio_context);
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return;
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}
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if (s->stage != 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 */
|
|
active_length = bdrv_getlength(s->active_disk->bs);
|
|
hidden_length = bdrv_getlength(s->hidden_disk->bs);
|
|
disk_length = bdrv_getlength(s->secondary_disk->bs);
|
|
if (active_length < 0 || hidden_length < 0 || disk_length < 0 ||
|
|
active_length != hidden_length || hidden_length != disk_length) {
|
|
error_setg(errp, "Active disk, hidden disk, secondary disk's length"
|
|
" are not the same");
|
|
aio_context_release(aio_context);
|
|
return;
|
|
}
|
|
|
|
/* Must be true, or the bdrv_getlength() calls would have failed */
|
|
assert(s->active_disk->bs->drv && s->hidden_disk->bs->drv);
|
|
|
|
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(bs, 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(bs, 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);
|
|
|
|
s->backup_job = backup_job_create(
|
|
NULL, s->secondary_disk->bs, s->hidden_disk->bs,
|
|
0, MIRROR_SYNC_MODE_NONE, NULL, 0, false, NULL,
|
|
BLOCKDEV_ON_ERROR_REPORT,
|
|
BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL,
|
|
backup_job_completed, bs, NULL, &local_err);
|
|
if (local_err) {
|
|
error_propagate(errp, local_err);
|
|
backup_job_cleanup(bs);
|
|
aio_context_release(aio_context);
|
|
return;
|
|
}
|
|
job_start(&s->backup_job->job);
|
|
break;
|
|
default:
|
|
aio_context_release(aio_context);
|
|
abort();
|
|
}
|
|
|
|
s->stage = 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->stage == BLOCK_REPLICATION_DONE ||
|
|
s->stage == BLOCK_REPLICATION_FAILOVER) {
|
|
/*
|
|
* This case happens when a secondary was promoted to primary.
|
|
* Ignore the request because the secondary side of replication
|
|
* doesn't have to do anything anymore.
|
|
*/
|
|
aio_context_release(aio_context);
|
|
return;
|
|
}
|
|
|
|
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->stage == BLOCK_REPLICATION_NONE) {
|
|
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->stage = BLOCK_REPLICATION_DONE;
|
|
|
|
s->active_disk = NULL;
|
|
s->secondary_disk = NULL;
|
|
s->hidden_disk = NULL;
|
|
s->error = 0;
|
|
} else {
|
|
s->stage = 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->stage == BLOCK_REPLICATION_DONE ||
|
|
s->stage == BLOCK_REPLICATION_FAILOVER) {
|
|
/*
|
|
* This case happens when a secondary was promoted to primary.
|
|
* Ignore the request because the secondary side of replication
|
|
* doesn't have to do anything anymore.
|
|
*/
|
|
aio_context_release(aio_context);
|
|
return;
|
|
}
|
|
|
|
if (s->stage != 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->stage = 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->backup_job) {
|
|
job_cancel_sync(&s->backup_job->job);
|
|
}
|
|
|
|
if (!failover) {
|
|
secondary_do_checkpoint(s, errp);
|
|
s->stage = BLOCK_REPLICATION_DONE;
|
|
aio_context_release(aio_context);
|
|
return;
|
|
}
|
|
|
|
s->stage = BLOCK_REPLICATION_FAILOVER;
|
|
s->commit_job = commit_active_start(
|
|
NULL, s->active_disk->bs, s->secondary_disk->bs,
|
|
JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT,
|
|
NULL, replication_done, bs, true, errp);
|
|
break;
|
|
default:
|
|
aio_context_release(aio_context);
|
|
abort();
|
|
}
|
|
aio_context_release(aio_context);
|
|
}
|
|
|
|
static const char *const replication_strong_runtime_opts[] = {
|
|
REPLICATION_MODE,
|
|
REPLICATION_TOP_ID,
|
|
|
|
NULL
|
|
};
|
|
|
|
static BlockDriver bdrv_replication = {
|
|
.format_name = "replication",
|
|
.instance_size = sizeof(BDRVReplicationState),
|
|
|
|
.bdrv_open = replication_open,
|
|
.bdrv_close = replication_close,
|
|
.bdrv_child_perm = replication_child_perm,
|
|
|
|
.bdrv_getlength = replication_getlength,
|
|
.bdrv_co_readv = replication_co_readv,
|
|
.bdrv_co_writev = replication_co_writev,
|
|
|
|
.is_filter = true,
|
|
|
|
.has_variable_length = true,
|
|
.strong_runtime_opts = replication_strong_runtime_opts,
|
|
};
|
|
|
|
static void bdrv_replication_init(void)
|
|
{
|
|
bdrv_register(&bdrv_replication);
|
|
}
|
|
|
|
block_init(bdrv_replication_init);
|