129ff7890SWen Congyang /* 229ff7890SWen Congyang * Replication Block filter 329ff7890SWen Congyang * 429ff7890SWen Congyang * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. 529ff7890SWen Congyang * Copyright (c) 2016 Intel Corporation 629ff7890SWen Congyang * Copyright (c) 2016 FUJITSU LIMITED 729ff7890SWen Congyang * 829ff7890SWen Congyang * Author: 929ff7890SWen Congyang * Wen Congyang <wency@cn.fujitsu.com> 1029ff7890SWen Congyang * 1129ff7890SWen Congyang * This work is licensed under the terms of the GNU GPL, version 2 or later. 1229ff7890SWen Congyang * See the COPYING file in the top-level directory. 1329ff7890SWen Congyang */ 1429ff7890SWen Congyang 1529ff7890SWen Congyang #include "qemu/osdep.h" 1629ff7890SWen Congyang #include "qemu-common.h" 1729ff7890SWen Congyang #include "block/nbd.h" 1829ff7890SWen Congyang #include "block/blockjob.h" 1929ff7890SWen Congyang #include "block/block_int.h" 2029ff7890SWen Congyang #include "block/block_backup.h" 2129ff7890SWen Congyang #include "sysemu/block-backend.h" 2229ff7890SWen Congyang #include "qapi/error.h" 2329ff7890SWen Congyang #include "replication.h" 2429ff7890SWen Congyang 2529ff7890SWen Congyang typedef struct BDRVReplicationState { 2629ff7890SWen Congyang ReplicationMode mode; 2729ff7890SWen Congyang int replication_state; 2829ff7890SWen Congyang BdrvChild *active_disk; 2929ff7890SWen Congyang BdrvChild *hidden_disk; 3029ff7890SWen Congyang BdrvChild *secondary_disk; 3129ff7890SWen Congyang char *top_id; 3229ff7890SWen Congyang ReplicationState *rs; 3329ff7890SWen Congyang Error *blocker; 3429ff7890SWen Congyang int orig_hidden_flags; 3529ff7890SWen Congyang int orig_secondary_flags; 3629ff7890SWen Congyang int error; 3729ff7890SWen Congyang } BDRVReplicationState; 3829ff7890SWen Congyang 3929ff7890SWen Congyang enum { 4029ff7890SWen Congyang BLOCK_REPLICATION_NONE, /* block replication is not started */ 4129ff7890SWen Congyang BLOCK_REPLICATION_RUNNING, /* block replication is running */ 4229ff7890SWen Congyang BLOCK_REPLICATION_FAILOVER, /* failover is running in background */ 4329ff7890SWen Congyang BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */ 4429ff7890SWen Congyang BLOCK_REPLICATION_DONE, /* block replication is done */ 4529ff7890SWen Congyang }; 4629ff7890SWen Congyang 4729ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 4829ff7890SWen Congyang Error **errp); 4929ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp); 5029ff7890SWen Congyang static void replication_get_error(ReplicationState *rs, Error **errp); 5129ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, 5229ff7890SWen Congyang Error **errp); 5329ff7890SWen Congyang 5429ff7890SWen Congyang #define REPLICATION_MODE "mode" 5529ff7890SWen Congyang #define REPLICATION_TOP_ID "top-id" 5629ff7890SWen Congyang static QemuOptsList replication_runtime_opts = { 5729ff7890SWen Congyang .name = "replication", 5829ff7890SWen Congyang .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), 5929ff7890SWen Congyang .desc = { 6029ff7890SWen Congyang { 6129ff7890SWen Congyang .name = REPLICATION_MODE, 6229ff7890SWen Congyang .type = QEMU_OPT_STRING, 6329ff7890SWen Congyang }, 6429ff7890SWen Congyang { 6529ff7890SWen Congyang .name = REPLICATION_TOP_ID, 6629ff7890SWen Congyang .type = QEMU_OPT_STRING, 6729ff7890SWen Congyang }, 6829ff7890SWen Congyang { /* end of list */ } 6929ff7890SWen Congyang }, 7029ff7890SWen Congyang }; 7129ff7890SWen Congyang 7229ff7890SWen Congyang static ReplicationOps replication_ops = { 7329ff7890SWen Congyang .start = replication_start, 7429ff7890SWen Congyang .checkpoint = replication_do_checkpoint, 7529ff7890SWen Congyang .get_error = replication_get_error, 7629ff7890SWen Congyang .stop = replication_stop, 7729ff7890SWen Congyang }; 7829ff7890SWen Congyang 7929ff7890SWen Congyang static int replication_open(BlockDriverState *bs, QDict *options, 8029ff7890SWen Congyang int flags, Error **errp) 8129ff7890SWen Congyang { 8229ff7890SWen Congyang int ret; 8329ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 8429ff7890SWen Congyang Error *local_err = NULL; 8529ff7890SWen Congyang QemuOpts *opts = NULL; 8629ff7890SWen Congyang const char *mode; 8729ff7890SWen Congyang const char *top_id; 8829ff7890SWen Congyang 894e4bf5c4SKevin Wolf bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 904e4bf5c4SKevin Wolf false, errp); 914e4bf5c4SKevin Wolf if (!bs->file) { 924e4bf5c4SKevin Wolf return -EINVAL; 934e4bf5c4SKevin Wolf } 944e4bf5c4SKevin Wolf 9529ff7890SWen Congyang ret = -EINVAL; 9629ff7890SWen Congyang opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); 9729ff7890SWen Congyang qemu_opts_absorb_qdict(opts, options, &local_err); 9829ff7890SWen Congyang if (local_err) { 9929ff7890SWen Congyang goto fail; 10029ff7890SWen Congyang } 10129ff7890SWen Congyang 10229ff7890SWen Congyang mode = qemu_opt_get(opts, REPLICATION_MODE); 10329ff7890SWen Congyang if (!mode) { 10429ff7890SWen Congyang error_setg(&local_err, "Missing the option mode"); 10529ff7890SWen Congyang goto fail; 10629ff7890SWen Congyang } 10729ff7890SWen Congyang 10829ff7890SWen Congyang if (!strcmp(mode, "primary")) { 10929ff7890SWen Congyang s->mode = REPLICATION_MODE_PRIMARY; 110f4f2539bSChanglong Xie top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 111f4f2539bSChanglong Xie if (top_id) { 112f4f2539bSChanglong Xie error_setg(&local_err, "The primary side does not support option top-id"); 113f4f2539bSChanglong Xie goto fail; 114f4f2539bSChanglong Xie } 11529ff7890SWen Congyang } else if (!strcmp(mode, "secondary")) { 11629ff7890SWen Congyang s->mode = REPLICATION_MODE_SECONDARY; 11729ff7890SWen Congyang top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 11829ff7890SWen Congyang s->top_id = g_strdup(top_id); 11929ff7890SWen Congyang if (!s->top_id) { 12029ff7890SWen Congyang error_setg(&local_err, "Missing the option top-id"); 12129ff7890SWen Congyang goto fail; 12229ff7890SWen Congyang } 12329ff7890SWen Congyang } else { 12429ff7890SWen Congyang error_setg(&local_err, 12529ff7890SWen Congyang "The option mode's value should be primary or secondary"); 12629ff7890SWen Congyang goto fail; 12729ff7890SWen Congyang } 12829ff7890SWen Congyang 12929ff7890SWen Congyang s->rs = replication_new(bs, &replication_ops); 13029ff7890SWen Congyang 13129ff7890SWen Congyang ret = 0; 13229ff7890SWen Congyang 13329ff7890SWen Congyang fail: 13429ff7890SWen Congyang qemu_opts_del(opts); 13529ff7890SWen Congyang error_propagate(errp, local_err); 13629ff7890SWen Congyang 13729ff7890SWen Congyang return ret; 13829ff7890SWen Congyang } 13929ff7890SWen Congyang 14029ff7890SWen Congyang static void replication_close(BlockDriverState *bs) 14129ff7890SWen Congyang { 14229ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 14329ff7890SWen Congyang 14429ff7890SWen Congyang if (s->replication_state == BLOCK_REPLICATION_RUNNING) { 14529ff7890SWen Congyang replication_stop(s->rs, false, NULL); 14629ff7890SWen Congyang } 14750ab0e09SPaolo Bonzini if (s->replication_state == BLOCK_REPLICATION_FAILOVER) { 14850ab0e09SPaolo Bonzini block_job_cancel_sync(s->active_disk->bs->job); 14950ab0e09SPaolo Bonzini } 15029ff7890SWen Congyang 15129ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 15229ff7890SWen Congyang g_free(s->top_id); 15329ff7890SWen Congyang } 15429ff7890SWen Congyang 15529ff7890SWen Congyang replication_remove(s->rs); 15629ff7890SWen Congyang } 15729ff7890SWen Congyang 158*37a9051cSChanglong Xie static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, 159*37a9051cSChanglong Xie const BdrvChildRole *role, 160*37a9051cSChanglong Xie uint64_t perm, uint64_t shared, 161*37a9051cSChanglong Xie uint64_t *nperm, uint64_t *nshared) 162*37a9051cSChanglong Xie { 163*37a9051cSChanglong Xie *nperm = *nshared = BLK_PERM_CONSISTENT_READ \ 164*37a9051cSChanglong Xie | BLK_PERM_WRITE \ 165*37a9051cSChanglong Xie | BLK_PERM_WRITE_UNCHANGED; 166*37a9051cSChanglong Xie 167*37a9051cSChanglong Xie return; 168*37a9051cSChanglong Xie } 169*37a9051cSChanglong Xie 17029ff7890SWen Congyang static int64_t replication_getlength(BlockDriverState *bs) 17129ff7890SWen Congyang { 17229ff7890SWen Congyang return bdrv_getlength(bs->file->bs); 17329ff7890SWen Congyang } 17429ff7890SWen Congyang 17529ff7890SWen Congyang static int replication_get_io_status(BDRVReplicationState *s) 17629ff7890SWen Congyang { 17729ff7890SWen Congyang switch (s->replication_state) { 17829ff7890SWen Congyang case BLOCK_REPLICATION_NONE: 17929ff7890SWen Congyang return -EIO; 18029ff7890SWen Congyang case BLOCK_REPLICATION_RUNNING: 18129ff7890SWen Congyang return 0; 18229ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER: 18329ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 18429ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER_FAILED: 18529ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; 18629ff7890SWen Congyang case BLOCK_REPLICATION_DONE: 18729ff7890SWen Congyang /* 18829ff7890SWen Congyang * active commit job completes, and active disk and secondary_disk 18929ff7890SWen Congyang * is swapped, so we can operate bs->file directly 19029ff7890SWen Congyang */ 19129ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 19229ff7890SWen Congyang default: 19329ff7890SWen Congyang abort(); 19429ff7890SWen Congyang } 19529ff7890SWen Congyang } 19629ff7890SWen Congyang 19729ff7890SWen Congyang static int replication_return_value(BDRVReplicationState *s, int ret) 19829ff7890SWen Congyang { 19929ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 20029ff7890SWen Congyang return ret; 20129ff7890SWen Congyang } 20229ff7890SWen Congyang 20329ff7890SWen Congyang if (ret < 0) { 20429ff7890SWen Congyang s->error = ret; 20529ff7890SWen Congyang ret = 0; 20629ff7890SWen Congyang } 20729ff7890SWen Congyang 20829ff7890SWen Congyang return ret; 20929ff7890SWen Congyang } 21029ff7890SWen Congyang 21129ff7890SWen Congyang static coroutine_fn int replication_co_readv(BlockDriverState *bs, 21229ff7890SWen Congyang int64_t sector_num, 21329ff7890SWen Congyang int remaining_sectors, 21429ff7890SWen Congyang QEMUIOVector *qiov) 21529ff7890SWen Congyang { 21629ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 21729ff7890SWen Congyang BdrvChild *child = s->secondary_disk; 21829ff7890SWen Congyang BlockJob *job = NULL; 21929ff7890SWen Congyang CowRequest req; 22029ff7890SWen Congyang int ret; 22129ff7890SWen Congyang 22229ff7890SWen Congyang if (s->mode == REPLICATION_MODE_PRIMARY) { 22329ff7890SWen Congyang /* We only use it to forward primary write requests */ 22429ff7890SWen Congyang return -EIO; 22529ff7890SWen Congyang } 22629ff7890SWen Congyang 22729ff7890SWen Congyang ret = replication_get_io_status(s); 22829ff7890SWen Congyang if (ret < 0) { 22929ff7890SWen Congyang return ret; 23029ff7890SWen Congyang } 23129ff7890SWen Congyang 23229ff7890SWen Congyang if (child && child->bs) { 23329ff7890SWen Congyang job = child->bs->job; 23429ff7890SWen Congyang } 23529ff7890SWen Congyang 23629ff7890SWen Congyang if (job) { 23729ff7890SWen Congyang backup_wait_for_overlapping_requests(child->bs->job, sector_num, 23829ff7890SWen Congyang remaining_sectors); 23929ff7890SWen Congyang backup_cow_request_begin(&req, child->bs->job, sector_num, 24029ff7890SWen Congyang remaining_sectors); 24129ff7890SWen Congyang ret = bdrv_co_readv(bs->file, sector_num, remaining_sectors, 24229ff7890SWen Congyang qiov); 24329ff7890SWen Congyang backup_cow_request_end(&req); 24429ff7890SWen Congyang goto out; 24529ff7890SWen Congyang } 24629ff7890SWen Congyang 24729ff7890SWen Congyang ret = bdrv_co_readv(bs->file, sector_num, remaining_sectors, qiov); 24829ff7890SWen Congyang out: 24929ff7890SWen Congyang return replication_return_value(s, ret); 25029ff7890SWen Congyang } 25129ff7890SWen Congyang 25229ff7890SWen Congyang static coroutine_fn int replication_co_writev(BlockDriverState *bs, 25329ff7890SWen Congyang int64_t sector_num, 25429ff7890SWen Congyang int remaining_sectors, 25529ff7890SWen Congyang QEMUIOVector *qiov) 25629ff7890SWen Congyang { 25729ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 25829ff7890SWen Congyang QEMUIOVector hd_qiov; 25929ff7890SWen Congyang uint64_t bytes_done = 0; 26029ff7890SWen Congyang BdrvChild *top = bs->file; 26129ff7890SWen Congyang BdrvChild *base = s->secondary_disk; 26229ff7890SWen Congyang BdrvChild *target; 26329ff7890SWen Congyang int ret, n; 26429ff7890SWen Congyang 26529ff7890SWen Congyang ret = replication_get_io_status(s); 26629ff7890SWen Congyang if (ret < 0) { 26729ff7890SWen Congyang goto out; 26829ff7890SWen Congyang } 26929ff7890SWen Congyang 27029ff7890SWen Congyang if (ret == 0) { 27129ff7890SWen Congyang ret = bdrv_co_writev(top, sector_num, 27229ff7890SWen Congyang remaining_sectors, qiov); 27329ff7890SWen Congyang return replication_return_value(s, ret); 27429ff7890SWen Congyang } 27529ff7890SWen Congyang 27629ff7890SWen Congyang /* 27729ff7890SWen Congyang * Failover failed, only write to active disk if the sectors 27829ff7890SWen Congyang * have already been allocated in active disk/hidden disk. 27929ff7890SWen Congyang */ 28029ff7890SWen Congyang qemu_iovec_init(&hd_qiov, qiov->niov); 28129ff7890SWen Congyang while (remaining_sectors > 0) { 28229ff7890SWen Congyang ret = bdrv_is_allocated_above(top->bs, base->bs, sector_num, 28329ff7890SWen Congyang remaining_sectors, &n); 28429ff7890SWen Congyang if (ret < 0) { 28529ff7890SWen Congyang goto out1; 28629ff7890SWen Congyang } 28729ff7890SWen Congyang 28829ff7890SWen Congyang qemu_iovec_reset(&hd_qiov); 28929ff7890SWen Congyang qemu_iovec_concat(&hd_qiov, qiov, bytes_done, n * BDRV_SECTOR_SIZE); 29029ff7890SWen Congyang 29129ff7890SWen Congyang target = ret ? top : base; 29229ff7890SWen Congyang ret = bdrv_co_writev(target, sector_num, n, &hd_qiov); 29329ff7890SWen Congyang if (ret < 0) { 29429ff7890SWen Congyang goto out1; 29529ff7890SWen Congyang } 29629ff7890SWen Congyang 29729ff7890SWen Congyang remaining_sectors -= n; 29829ff7890SWen Congyang sector_num += n; 29929ff7890SWen Congyang bytes_done += n * BDRV_SECTOR_SIZE; 30029ff7890SWen Congyang } 30129ff7890SWen Congyang 30229ff7890SWen Congyang out1: 30329ff7890SWen Congyang qemu_iovec_destroy(&hd_qiov); 30429ff7890SWen Congyang out: 30529ff7890SWen Congyang return ret; 30629ff7890SWen Congyang } 30729ff7890SWen Congyang 30829ff7890SWen Congyang static bool replication_recurse_is_first_non_filter(BlockDriverState *bs, 30929ff7890SWen Congyang BlockDriverState *candidate) 31029ff7890SWen Congyang { 31129ff7890SWen Congyang return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); 31229ff7890SWen Congyang } 31329ff7890SWen Congyang 31429ff7890SWen Congyang static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) 31529ff7890SWen Congyang { 31629ff7890SWen Congyang Error *local_err = NULL; 31729ff7890SWen Congyang int ret; 31829ff7890SWen Congyang 31929ff7890SWen Congyang if (!s->secondary_disk->bs->job) { 32029ff7890SWen Congyang error_setg(errp, "Backup job was cancelled unexpectedly"); 32129ff7890SWen Congyang return; 32229ff7890SWen Congyang } 32329ff7890SWen Congyang 32429ff7890SWen Congyang backup_do_checkpoint(s->secondary_disk->bs->job, &local_err); 32529ff7890SWen Congyang if (local_err) { 32629ff7890SWen Congyang error_propagate(errp, local_err); 32729ff7890SWen Congyang return; 32829ff7890SWen Congyang } 32929ff7890SWen Congyang 33029ff7890SWen Congyang ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs); 33129ff7890SWen Congyang if (ret < 0) { 33229ff7890SWen Congyang error_setg(errp, "Cannot make active disk empty"); 33329ff7890SWen Congyang return; 33429ff7890SWen Congyang } 33529ff7890SWen Congyang 33629ff7890SWen Congyang ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs); 33729ff7890SWen Congyang if (ret < 0) { 33829ff7890SWen Congyang error_setg(errp, "Cannot make hidden disk empty"); 33929ff7890SWen Congyang return; 34029ff7890SWen Congyang } 34129ff7890SWen Congyang } 34229ff7890SWen Congyang 3438dd9006eSPaolo Bonzini static void reopen_backing_file(BlockDriverState *bs, bool writable, 34429ff7890SWen Congyang Error **errp) 34529ff7890SWen Congyang { 3468dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 34729ff7890SWen Congyang BlockReopenQueue *reopen_queue = NULL; 34829ff7890SWen Congyang int orig_hidden_flags, orig_secondary_flags; 34929ff7890SWen Congyang int new_hidden_flags, new_secondary_flags; 35029ff7890SWen Congyang Error *local_err = NULL; 35129ff7890SWen Congyang 35229ff7890SWen Congyang if (writable) { 35329ff7890SWen Congyang orig_hidden_flags = s->orig_hidden_flags = 35429ff7890SWen Congyang bdrv_get_flags(s->hidden_disk->bs); 35529ff7890SWen Congyang new_hidden_flags = (orig_hidden_flags | BDRV_O_RDWR) & 35629ff7890SWen Congyang ~BDRV_O_INACTIVE; 35729ff7890SWen Congyang orig_secondary_flags = s->orig_secondary_flags = 35829ff7890SWen Congyang bdrv_get_flags(s->secondary_disk->bs); 35929ff7890SWen Congyang new_secondary_flags = (orig_secondary_flags | BDRV_O_RDWR) & 36029ff7890SWen Congyang ~BDRV_O_INACTIVE; 36129ff7890SWen Congyang } else { 36229ff7890SWen Congyang orig_hidden_flags = (s->orig_hidden_flags | BDRV_O_RDWR) & 36329ff7890SWen Congyang ~BDRV_O_INACTIVE; 36429ff7890SWen Congyang new_hidden_flags = s->orig_hidden_flags; 36529ff7890SWen Congyang orig_secondary_flags = (s->orig_secondary_flags | BDRV_O_RDWR) & 36629ff7890SWen Congyang ~BDRV_O_INACTIVE; 36729ff7890SWen Congyang new_secondary_flags = s->orig_secondary_flags; 36829ff7890SWen Congyang } 36929ff7890SWen Congyang 37029ff7890SWen Congyang if (orig_hidden_flags != new_hidden_flags) { 37129ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, NULL, 37229ff7890SWen Congyang new_hidden_flags); 37329ff7890SWen Congyang } 37429ff7890SWen Congyang 37529ff7890SWen Congyang if (!(orig_secondary_flags & BDRV_O_RDWR)) { 37629ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, 37729ff7890SWen Congyang NULL, new_secondary_flags); 37829ff7890SWen Congyang } 37929ff7890SWen Congyang 38029ff7890SWen Congyang if (reopen_queue) { 381720150f3SPaolo Bonzini bdrv_reopen_multiple(bdrv_get_aio_context(bs), 382720150f3SPaolo Bonzini reopen_queue, &local_err); 38329ff7890SWen Congyang error_propagate(errp, local_err); 38429ff7890SWen Congyang } 38529ff7890SWen Congyang } 38629ff7890SWen Congyang 3878dd9006eSPaolo Bonzini static void backup_job_cleanup(BlockDriverState *bs) 38829ff7890SWen Congyang { 3898dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 39029ff7890SWen Congyang BlockDriverState *top_bs; 39129ff7890SWen Congyang 39229ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 39329ff7890SWen Congyang if (!top_bs) { 39429ff7890SWen Congyang return; 39529ff7890SWen Congyang } 39629ff7890SWen Congyang bdrv_op_unblock_all(top_bs, s->blocker); 39729ff7890SWen Congyang error_free(s->blocker); 3988dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 39929ff7890SWen Congyang } 40029ff7890SWen Congyang 40129ff7890SWen Congyang static void backup_job_completed(void *opaque, int ret) 40229ff7890SWen Congyang { 4038dd9006eSPaolo Bonzini BlockDriverState *bs = opaque; 4048dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 40529ff7890SWen Congyang 40629ff7890SWen Congyang if (s->replication_state != BLOCK_REPLICATION_FAILOVER) { 40729ff7890SWen Congyang /* The backup job is cancelled unexpectedly */ 40829ff7890SWen Congyang s->error = -EIO; 40929ff7890SWen Congyang } 41029ff7890SWen Congyang 4118dd9006eSPaolo Bonzini backup_job_cleanup(bs); 41229ff7890SWen Congyang } 41329ff7890SWen Congyang 41429ff7890SWen Congyang static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) 41529ff7890SWen Congyang { 41629ff7890SWen Congyang BdrvChild *child; 41729ff7890SWen Congyang 41829ff7890SWen Congyang /* The bs itself is the top_bs */ 41929ff7890SWen Congyang if (top_bs == bs) { 42029ff7890SWen Congyang return true; 42129ff7890SWen Congyang } 42229ff7890SWen Congyang 42329ff7890SWen Congyang /* Iterate over top_bs's children */ 42429ff7890SWen Congyang QLIST_FOREACH(child, &top_bs->children, next) { 42529ff7890SWen Congyang if (child->bs == bs || check_top_bs(child->bs, bs)) { 42629ff7890SWen Congyang return true; 42729ff7890SWen Congyang } 42829ff7890SWen Congyang } 42929ff7890SWen Congyang 43029ff7890SWen Congyang return false; 43129ff7890SWen Congyang } 43229ff7890SWen Congyang 43329ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 43429ff7890SWen Congyang Error **errp) 43529ff7890SWen Congyang { 43629ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 43729ff7890SWen Congyang BDRVReplicationState *s; 43829ff7890SWen Congyang BlockDriverState *top_bs; 43929ff7890SWen Congyang int64_t active_length, hidden_length, disk_length; 44029ff7890SWen Congyang AioContext *aio_context; 44129ff7890SWen Congyang Error *local_err = NULL; 442111049a4SJohn Snow BlockJob *job; 44329ff7890SWen Congyang 44429ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 44529ff7890SWen Congyang aio_context_acquire(aio_context); 44629ff7890SWen Congyang s = bs->opaque; 44729ff7890SWen Congyang 44829ff7890SWen Congyang if (s->replication_state != BLOCK_REPLICATION_NONE) { 44929ff7890SWen Congyang error_setg(errp, "Block replication is running or done"); 45029ff7890SWen Congyang aio_context_release(aio_context); 45129ff7890SWen Congyang return; 45229ff7890SWen Congyang } 45329ff7890SWen Congyang 45429ff7890SWen Congyang if (s->mode != mode) { 45529ff7890SWen Congyang error_setg(errp, "The parameter mode's value is invalid, needs %d," 45629ff7890SWen Congyang " but got %d", s->mode, mode); 45729ff7890SWen Congyang aio_context_release(aio_context); 45829ff7890SWen Congyang return; 45929ff7890SWen Congyang } 46029ff7890SWen Congyang 46129ff7890SWen Congyang switch (s->mode) { 46229ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 46329ff7890SWen Congyang break; 46429ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 46529ff7890SWen Congyang s->active_disk = bs->file; 46629ff7890SWen Congyang if (!s->active_disk || !s->active_disk->bs || 46729ff7890SWen Congyang !s->active_disk->bs->backing) { 46829ff7890SWen Congyang error_setg(errp, "Active disk doesn't have backing file"); 46929ff7890SWen Congyang aio_context_release(aio_context); 47029ff7890SWen Congyang return; 47129ff7890SWen Congyang } 47229ff7890SWen Congyang 47329ff7890SWen Congyang s->hidden_disk = s->active_disk->bs->backing; 47429ff7890SWen Congyang if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { 47529ff7890SWen Congyang error_setg(errp, "Hidden disk doesn't have backing file"); 47629ff7890SWen Congyang aio_context_release(aio_context); 47729ff7890SWen Congyang return; 47829ff7890SWen Congyang } 47929ff7890SWen Congyang 48029ff7890SWen Congyang s->secondary_disk = s->hidden_disk->bs->backing; 48129ff7890SWen Congyang if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { 48229ff7890SWen Congyang error_setg(errp, "The secondary disk doesn't have block backend"); 48329ff7890SWen Congyang aio_context_release(aio_context); 48429ff7890SWen Congyang return; 48529ff7890SWen Congyang } 48629ff7890SWen Congyang 48729ff7890SWen Congyang /* verify the length */ 48829ff7890SWen Congyang active_length = bdrv_getlength(s->active_disk->bs); 48929ff7890SWen Congyang hidden_length = bdrv_getlength(s->hidden_disk->bs); 49029ff7890SWen Congyang disk_length = bdrv_getlength(s->secondary_disk->bs); 49129ff7890SWen Congyang if (active_length < 0 || hidden_length < 0 || disk_length < 0 || 49229ff7890SWen Congyang active_length != hidden_length || hidden_length != disk_length) { 49329ff7890SWen Congyang error_setg(errp, "Active disk, hidden disk, secondary disk's length" 49429ff7890SWen Congyang " are not the same"); 49529ff7890SWen Congyang aio_context_release(aio_context); 49629ff7890SWen Congyang return; 49729ff7890SWen Congyang } 49829ff7890SWen Congyang 49929ff7890SWen Congyang if (!s->active_disk->bs->drv->bdrv_make_empty || 50029ff7890SWen Congyang !s->hidden_disk->bs->drv->bdrv_make_empty) { 50129ff7890SWen Congyang error_setg(errp, 50229ff7890SWen Congyang "Active disk or hidden disk doesn't support make_empty"); 50329ff7890SWen Congyang aio_context_release(aio_context); 50429ff7890SWen Congyang return; 50529ff7890SWen Congyang } 50629ff7890SWen Congyang 50729ff7890SWen Congyang /* reopen the backing file in r/w mode */ 5088dd9006eSPaolo Bonzini reopen_backing_file(bs, true, &local_err); 50929ff7890SWen Congyang if (local_err) { 51029ff7890SWen Congyang error_propagate(errp, local_err); 51129ff7890SWen Congyang aio_context_release(aio_context); 51229ff7890SWen Congyang return; 51329ff7890SWen Congyang } 51429ff7890SWen Congyang 51529ff7890SWen Congyang /* start backup job now */ 51629ff7890SWen Congyang error_setg(&s->blocker, 51729ff7890SWen Congyang "Block device is in use by internal backup job"); 51829ff7890SWen Congyang 51929ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 52029ff7890SWen Congyang if (!top_bs || !bdrv_is_root_node(top_bs) || 52129ff7890SWen Congyang !check_top_bs(top_bs, bs)) { 52229ff7890SWen Congyang error_setg(errp, "No top_bs or it is invalid"); 5238dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 52429ff7890SWen Congyang aio_context_release(aio_context); 52529ff7890SWen Congyang return; 52629ff7890SWen Congyang } 52729ff7890SWen Congyang bdrv_op_block_all(top_bs, s->blocker); 52829ff7890SWen Congyang bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); 52929ff7890SWen Congyang 530111049a4SJohn Snow job = backup_job_create(NULL, s->secondary_disk->bs, s->hidden_disk->bs, 531111049a4SJohn Snow 0, MIRROR_SYNC_MODE_NONE, NULL, false, 532111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, 533111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, BLOCK_JOB_INTERNAL, 534111049a4SJohn Snow backup_job_completed, bs, NULL, &local_err); 53529ff7890SWen Congyang if (local_err) { 53629ff7890SWen Congyang error_propagate(errp, local_err); 5378dd9006eSPaolo Bonzini backup_job_cleanup(bs); 53829ff7890SWen Congyang aio_context_release(aio_context); 53929ff7890SWen Congyang return; 54029ff7890SWen Congyang } 541111049a4SJohn Snow block_job_start(job); 54229ff7890SWen Congyang break; 54329ff7890SWen Congyang default: 54429ff7890SWen Congyang aio_context_release(aio_context); 54529ff7890SWen Congyang abort(); 54629ff7890SWen Congyang } 54729ff7890SWen Congyang 54829ff7890SWen Congyang s->replication_state = BLOCK_REPLICATION_RUNNING; 54929ff7890SWen Congyang 55029ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 55129ff7890SWen Congyang secondary_do_checkpoint(s, errp); 55229ff7890SWen Congyang } 55329ff7890SWen Congyang 55429ff7890SWen Congyang s->error = 0; 55529ff7890SWen Congyang aio_context_release(aio_context); 55629ff7890SWen Congyang } 55729ff7890SWen Congyang 55829ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp) 55929ff7890SWen Congyang { 56029ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 56129ff7890SWen Congyang BDRVReplicationState *s; 56229ff7890SWen Congyang AioContext *aio_context; 56329ff7890SWen Congyang 56429ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 56529ff7890SWen Congyang aio_context_acquire(aio_context); 56629ff7890SWen Congyang s = bs->opaque; 56729ff7890SWen Congyang 56829ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 56929ff7890SWen Congyang secondary_do_checkpoint(s, errp); 57029ff7890SWen Congyang } 57129ff7890SWen Congyang aio_context_release(aio_context); 57229ff7890SWen Congyang } 57329ff7890SWen Congyang 57429ff7890SWen Congyang static void replication_get_error(ReplicationState *rs, Error **errp) 57529ff7890SWen Congyang { 57629ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 57729ff7890SWen Congyang BDRVReplicationState *s; 57829ff7890SWen Congyang AioContext *aio_context; 57929ff7890SWen Congyang 58029ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 58129ff7890SWen Congyang aio_context_acquire(aio_context); 58229ff7890SWen Congyang s = bs->opaque; 58329ff7890SWen Congyang 58429ff7890SWen Congyang if (s->replication_state != BLOCK_REPLICATION_RUNNING) { 58529ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 58629ff7890SWen Congyang aio_context_release(aio_context); 58729ff7890SWen Congyang return; 58829ff7890SWen Congyang } 58929ff7890SWen Congyang 59029ff7890SWen Congyang if (s->error) { 59129ff7890SWen Congyang error_setg(errp, "I/O error occurred"); 59229ff7890SWen Congyang aio_context_release(aio_context); 59329ff7890SWen Congyang return; 59429ff7890SWen Congyang } 59529ff7890SWen Congyang aio_context_release(aio_context); 59629ff7890SWen Congyang } 59729ff7890SWen Congyang 59829ff7890SWen Congyang static void replication_done(void *opaque, int ret) 59929ff7890SWen Congyang { 60029ff7890SWen Congyang BlockDriverState *bs = opaque; 60129ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 60229ff7890SWen Congyang 60329ff7890SWen Congyang if (ret == 0) { 60429ff7890SWen Congyang s->replication_state = BLOCK_REPLICATION_DONE; 60529ff7890SWen Congyang 60629ff7890SWen Congyang /* refresh top bs's filename */ 60729ff7890SWen Congyang bdrv_refresh_filename(bs); 60829ff7890SWen Congyang s->active_disk = NULL; 60929ff7890SWen Congyang s->secondary_disk = NULL; 61029ff7890SWen Congyang s->hidden_disk = NULL; 61129ff7890SWen Congyang s->error = 0; 61229ff7890SWen Congyang } else { 61329ff7890SWen Congyang s->replication_state = BLOCK_REPLICATION_FAILOVER_FAILED; 61429ff7890SWen Congyang s->error = -EIO; 61529ff7890SWen Congyang } 61629ff7890SWen Congyang } 61729ff7890SWen Congyang 61829ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, Error **errp) 61929ff7890SWen Congyang { 62029ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 62129ff7890SWen Congyang BDRVReplicationState *s; 62229ff7890SWen Congyang AioContext *aio_context; 62329ff7890SWen Congyang 62429ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 62529ff7890SWen Congyang aio_context_acquire(aio_context); 62629ff7890SWen Congyang s = bs->opaque; 62729ff7890SWen Congyang 62829ff7890SWen Congyang if (s->replication_state != BLOCK_REPLICATION_RUNNING) { 62929ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 63029ff7890SWen Congyang aio_context_release(aio_context); 63129ff7890SWen Congyang return; 63229ff7890SWen Congyang } 63329ff7890SWen Congyang 63429ff7890SWen Congyang switch (s->mode) { 63529ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 63629ff7890SWen Congyang s->replication_state = BLOCK_REPLICATION_DONE; 63729ff7890SWen Congyang s->error = 0; 63829ff7890SWen Congyang break; 63929ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 64029ff7890SWen Congyang /* 64129ff7890SWen Congyang * This BDS will be closed, and the job should be completed 64229ff7890SWen Congyang * before the BDS is closed, because we will access hidden 64329ff7890SWen Congyang * disk, secondary disk in backup_job_completed(). 64429ff7890SWen Congyang */ 64529ff7890SWen Congyang if (s->secondary_disk->bs->job) { 64629ff7890SWen Congyang block_job_cancel_sync(s->secondary_disk->bs->job); 64729ff7890SWen Congyang } 64829ff7890SWen Congyang 64929ff7890SWen Congyang if (!failover) { 65029ff7890SWen Congyang secondary_do_checkpoint(s, errp); 65129ff7890SWen Congyang s->replication_state = BLOCK_REPLICATION_DONE; 65229ff7890SWen Congyang aio_context_release(aio_context); 65329ff7890SWen Congyang return; 65429ff7890SWen Congyang } 65529ff7890SWen Congyang 65629ff7890SWen Congyang s->replication_state = BLOCK_REPLICATION_FAILOVER; 65747970dfbSJohn Snow commit_active_start(NULL, s->active_disk->bs, s->secondary_disk->bs, 65847970dfbSJohn Snow BLOCK_JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, 6590db832f4SKevin Wolf NULL, replication_done, bs, errp, true); 66029ff7890SWen Congyang break; 66129ff7890SWen Congyang default: 66229ff7890SWen Congyang aio_context_release(aio_context); 66329ff7890SWen Congyang abort(); 66429ff7890SWen Congyang } 66529ff7890SWen Congyang aio_context_release(aio_context); 66629ff7890SWen Congyang } 66729ff7890SWen Congyang 66829ff7890SWen Congyang BlockDriver bdrv_replication = { 66929ff7890SWen Congyang .format_name = "replication", 67029ff7890SWen Congyang .protocol_name = "replication", 67129ff7890SWen Congyang .instance_size = sizeof(BDRVReplicationState), 67229ff7890SWen Congyang 67329ff7890SWen Congyang .bdrv_open = replication_open, 67429ff7890SWen Congyang .bdrv_close = replication_close, 675*37a9051cSChanglong Xie .bdrv_child_perm = replication_child_perm, 67629ff7890SWen Congyang 67729ff7890SWen Congyang .bdrv_getlength = replication_getlength, 67829ff7890SWen Congyang .bdrv_co_readv = replication_co_readv, 67929ff7890SWen Congyang .bdrv_co_writev = replication_co_writev, 68029ff7890SWen Congyang 68129ff7890SWen Congyang .is_filter = true, 68229ff7890SWen Congyang .bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter, 68329ff7890SWen Congyang 68429ff7890SWen Congyang .has_variable_length = true, 68529ff7890SWen Congyang }; 68629ff7890SWen Congyang 68729ff7890SWen Congyang static void bdrv_replication_init(void) 68829ff7890SWen Congyang { 68929ff7890SWen Congyang bdrv_register(&bdrv_replication); 69029ff7890SWen Congyang } 69129ff7890SWen Congyang 69229ff7890SWen Congyang block_init(bdrv_replication_init); 693