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 253c76c606SFam Zheng typedef enum { 263c76c606SFam Zheng BLOCK_REPLICATION_NONE, /* block replication is not started */ 273c76c606SFam Zheng BLOCK_REPLICATION_RUNNING, /* block replication is running */ 283c76c606SFam Zheng BLOCK_REPLICATION_FAILOVER, /* failover is running in background */ 293c76c606SFam Zheng BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */ 303c76c606SFam Zheng BLOCK_REPLICATION_DONE, /* block replication is done */ 313c76c606SFam Zheng } ReplicationStage; 323c76c606SFam Zheng 3329ff7890SWen Congyang typedef struct BDRVReplicationState { 3429ff7890SWen Congyang ReplicationMode mode; 353c76c606SFam Zheng ReplicationStage stage; 3629ff7890SWen Congyang BdrvChild *active_disk; 3729ff7890SWen Congyang BdrvChild *hidden_disk; 3829ff7890SWen Congyang BdrvChild *secondary_disk; 3929ff7890SWen Congyang char *top_id; 4029ff7890SWen Congyang ReplicationState *rs; 4129ff7890SWen Congyang Error *blocker; 4229ff7890SWen Congyang int orig_hidden_flags; 4329ff7890SWen Congyang int orig_secondary_flags; 4429ff7890SWen Congyang int error; 4529ff7890SWen Congyang } BDRVReplicationState; 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 1443c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_RUNNING) { 14529ff7890SWen Congyang replication_stop(s->rs, false, NULL); 14629ff7890SWen Congyang } 1473c76c606SFam Zheng if (s->stage == 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 15837a9051cSChanglong Xie static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, 15937a9051cSChanglong Xie const BdrvChildRole *role, 16037a9051cSChanglong Xie uint64_t perm, uint64_t shared, 16137a9051cSChanglong Xie uint64_t *nperm, uint64_t *nshared) 16237a9051cSChanglong Xie { 16337a9051cSChanglong Xie *nperm = *nshared = BLK_PERM_CONSISTENT_READ \ 16437a9051cSChanglong Xie | BLK_PERM_WRITE \ 16537a9051cSChanglong Xie | BLK_PERM_WRITE_UNCHANGED; 16637a9051cSChanglong Xie 16737a9051cSChanglong Xie return; 16837a9051cSChanglong Xie } 16937a9051cSChanglong 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 { 1773c76c606SFam Zheng switch (s->stage) { 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) { 237*f6ac2078SEric Blake uint64_t remaining_bytes = remaining_sectors * BDRV_SECTOR_SIZE; 238*f6ac2078SEric Blake 239*f6ac2078SEric Blake backup_wait_for_overlapping_requests(child->bs->job, 240*f6ac2078SEric Blake sector_num * BDRV_SECTOR_SIZE, 241*f6ac2078SEric Blake remaining_bytes); 242*f6ac2078SEric Blake backup_cow_request_begin(&req, child->bs->job, 243*f6ac2078SEric Blake sector_num * BDRV_SECTOR_SIZE, 244*f6ac2078SEric Blake remaining_bytes); 24529ff7890SWen Congyang ret = bdrv_co_readv(bs->file, sector_num, remaining_sectors, 24629ff7890SWen Congyang qiov); 24729ff7890SWen Congyang backup_cow_request_end(&req); 24829ff7890SWen Congyang goto out; 24929ff7890SWen Congyang } 25029ff7890SWen Congyang 25129ff7890SWen Congyang ret = bdrv_co_readv(bs->file, sector_num, remaining_sectors, qiov); 25229ff7890SWen Congyang out: 25329ff7890SWen Congyang return replication_return_value(s, ret); 25429ff7890SWen Congyang } 25529ff7890SWen Congyang 25629ff7890SWen Congyang static coroutine_fn int replication_co_writev(BlockDriverState *bs, 25729ff7890SWen Congyang int64_t sector_num, 25829ff7890SWen Congyang int remaining_sectors, 25929ff7890SWen Congyang QEMUIOVector *qiov) 26029ff7890SWen Congyang { 26129ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 26229ff7890SWen Congyang QEMUIOVector hd_qiov; 26329ff7890SWen Congyang uint64_t bytes_done = 0; 26429ff7890SWen Congyang BdrvChild *top = bs->file; 26529ff7890SWen Congyang BdrvChild *base = s->secondary_disk; 26629ff7890SWen Congyang BdrvChild *target; 26729ff7890SWen Congyang int ret, n; 26829ff7890SWen Congyang 26929ff7890SWen Congyang ret = replication_get_io_status(s); 27029ff7890SWen Congyang if (ret < 0) { 27129ff7890SWen Congyang goto out; 27229ff7890SWen Congyang } 27329ff7890SWen Congyang 27429ff7890SWen Congyang if (ret == 0) { 27529ff7890SWen Congyang ret = bdrv_co_writev(top, sector_num, 27629ff7890SWen Congyang remaining_sectors, qiov); 27729ff7890SWen Congyang return replication_return_value(s, ret); 27829ff7890SWen Congyang } 27929ff7890SWen Congyang 28029ff7890SWen Congyang /* 28129ff7890SWen Congyang * Failover failed, only write to active disk if the sectors 28229ff7890SWen Congyang * have already been allocated in active disk/hidden disk. 28329ff7890SWen Congyang */ 28429ff7890SWen Congyang qemu_iovec_init(&hd_qiov, qiov->niov); 28529ff7890SWen Congyang while (remaining_sectors > 0) { 28629ff7890SWen Congyang ret = bdrv_is_allocated_above(top->bs, base->bs, sector_num, 28729ff7890SWen Congyang remaining_sectors, &n); 28829ff7890SWen Congyang if (ret < 0) { 28929ff7890SWen Congyang goto out1; 29029ff7890SWen Congyang } 29129ff7890SWen Congyang 29229ff7890SWen Congyang qemu_iovec_reset(&hd_qiov); 29329ff7890SWen Congyang qemu_iovec_concat(&hd_qiov, qiov, bytes_done, n * BDRV_SECTOR_SIZE); 29429ff7890SWen Congyang 29529ff7890SWen Congyang target = ret ? top : base; 29629ff7890SWen Congyang ret = bdrv_co_writev(target, sector_num, n, &hd_qiov); 29729ff7890SWen Congyang if (ret < 0) { 29829ff7890SWen Congyang goto out1; 29929ff7890SWen Congyang } 30029ff7890SWen Congyang 30129ff7890SWen Congyang remaining_sectors -= n; 30229ff7890SWen Congyang sector_num += n; 30329ff7890SWen Congyang bytes_done += n * BDRV_SECTOR_SIZE; 30429ff7890SWen Congyang } 30529ff7890SWen Congyang 30629ff7890SWen Congyang out1: 30729ff7890SWen Congyang qemu_iovec_destroy(&hd_qiov); 30829ff7890SWen Congyang out: 30929ff7890SWen Congyang return ret; 31029ff7890SWen Congyang } 31129ff7890SWen Congyang 31229ff7890SWen Congyang static bool replication_recurse_is_first_non_filter(BlockDriverState *bs, 31329ff7890SWen Congyang BlockDriverState *candidate) 31429ff7890SWen Congyang { 31529ff7890SWen Congyang return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); 31629ff7890SWen Congyang } 31729ff7890SWen Congyang 31829ff7890SWen Congyang static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) 31929ff7890SWen Congyang { 32029ff7890SWen Congyang Error *local_err = NULL; 32129ff7890SWen Congyang int ret; 32229ff7890SWen Congyang 32329ff7890SWen Congyang if (!s->secondary_disk->bs->job) { 32429ff7890SWen Congyang error_setg(errp, "Backup job was cancelled unexpectedly"); 32529ff7890SWen Congyang return; 32629ff7890SWen Congyang } 32729ff7890SWen Congyang 32829ff7890SWen Congyang backup_do_checkpoint(s->secondary_disk->bs->job, &local_err); 32929ff7890SWen Congyang if (local_err) { 33029ff7890SWen Congyang error_propagate(errp, local_err); 33129ff7890SWen Congyang return; 33229ff7890SWen Congyang } 33329ff7890SWen Congyang 33429ff7890SWen Congyang ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs); 33529ff7890SWen Congyang if (ret < 0) { 33629ff7890SWen Congyang error_setg(errp, "Cannot make active disk empty"); 33729ff7890SWen Congyang return; 33829ff7890SWen Congyang } 33929ff7890SWen Congyang 34029ff7890SWen Congyang ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs); 34129ff7890SWen Congyang if (ret < 0) { 34229ff7890SWen Congyang error_setg(errp, "Cannot make hidden disk empty"); 34329ff7890SWen Congyang return; 34429ff7890SWen Congyang } 34529ff7890SWen Congyang } 34629ff7890SWen Congyang 3478dd9006eSPaolo Bonzini static void reopen_backing_file(BlockDriverState *bs, bool writable, 34829ff7890SWen Congyang Error **errp) 34929ff7890SWen Congyang { 3508dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 35129ff7890SWen Congyang BlockReopenQueue *reopen_queue = NULL; 35229ff7890SWen Congyang int orig_hidden_flags, orig_secondary_flags; 35329ff7890SWen Congyang int new_hidden_flags, new_secondary_flags; 35429ff7890SWen Congyang Error *local_err = NULL; 35529ff7890SWen Congyang 35629ff7890SWen Congyang if (writable) { 35729ff7890SWen Congyang orig_hidden_flags = s->orig_hidden_flags = 35829ff7890SWen Congyang bdrv_get_flags(s->hidden_disk->bs); 35929ff7890SWen Congyang new_hidden_flags = (orig_hidden_flags | BDRV_O_RDWR) & 36029ff7890SWen Congyang ~BDRV_O_INACTIVE; 36129ff7890SWen Congyang orig_secondary_flags = s->orig_secondary_flags = 36229ff7890SWen Congyang bdrv_get_flags(s->secondary_disk->bs); 36329ff7890SWen Congyang new_secondary_flags = (orig_secondary_flags | BDRV_O_RDWR) & 36429ff7890SWen Congyang ~BDRV_O_INACTIVE; 36529ff7890SWen Congyang } else { 36629ff7890SWen Congyang orig_hidden_flags = (s->orig_hidden_flags | BDRV_O_RDWR) & 36729ff7890SWen Congyang ~BDRV_O_INACTIVE; 36829ff7890SWen Congyang new_hidden_flags = s->orig_hidden_flags; 36929ff7890SWen Congyang orig_secondary_flags = (s->orig_secondary_flags | BDRV_O_RDWR) & 37029ff7890SWen Congyang ~BDRV_O_INACTIVE; 37129ff7890SWen Congyang new_secondary_flags = s->orig_secondary_flags; 37229ff7890SWen Congyang } 37329ff7890SWen Congyang 37429ff7890SWen Congyang if (orig_hidden_flags != new_hidden_flags) { 37529ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, NULL, 37629ff7890SWen Congyang new_hidden_flags); 37729ff7890SWen Congyang } 37829ff7890SWen Congyang 37929ff7890SWen Congyang if (!(orig_secondary_flags & BDRV_O_RDWR)) { 38029ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, 38129ff7890SWen Congyang NULL, new_secondary_flags); 38229ff7890SWen Congyang } 38329ff7890SWen Congyang 38429ff7890SWen Congyang if (reopen_queue) { 385720150f3SPaolo Bonzini bdrv_reopen_multiple(bdrv_get_aio_context(bs), 386720150f3SPaolo Bonzini reopen_queue, &local_err); 38729ff7890SWen Congyang error_propagate(errp, local_err); 38829ff7890SWen Congyang } 38929ff7890SWen Congyang } 39029ff7890SWen Congyang 3918dd9006eSPaolo Bonzini static void backup_job_cleanup(BlockDriverState *bs) 39229ff7890SWen Congyang { 3938dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 39429ff7890SWen Congyang BlockDriverState *top_bs; 39529ff7890SWen Congyang 39629ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 39729ff7890SWen Congyang if (!top_bs) { 39829ff7890SWen Congyang return; 39929ff7890SWen Congyang } 40029ff7890SWen Congyang bdrv_op_unblock_all(top_bs, s->blocker); 40129ff7890SWen Congyang error_free(s->blocker); 4028dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 40329ff7890SWen Congyang } 40429ff7890SWen Congyang 40529ff7890SWen Congyang static void backup_job_completed(void *opaque, int ret) 40629ff7890SWen Congyang { 4078dd9006eSPaolo Bonzini BlockDriverState *bs = opaque; 4088dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 40929ff7890SWen Congyang 4103c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_FAILOVER) { 41129ff7890SWen Congyang /* The backup job is cancelled unexpectedly */ 41229ff7890SWen Congyang s->error = -EIO; 41329ff7890SWen Congyang } 41429ff7890SWen Congyang 4158dd9006eSPaolo Bonzini backup_job_cleanup(bs); 41629ff7890SWen Congyang } 41729ff7890SWen Congyang 41829ff7890SWen Congyang static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) 41929ff7890SWen Congyang { 42029ff7890SWen Congyang BdrvChild *child; 42129ff7890SWen Congyang 42229ff7890SWen Congyang /* The bs itself is the top_bs */ 42329ff7890SWen Congyang if (top_bs == bs) { 42429ff7890SWen Congyang return true; 42529ff7890SWen Congyang } 42629ff7890SWen Congyang 42729ff7890SWen Congyang /* Iterate over top_bs's children */ 42829ff7890SWen Congyang QLIST_FOREACH(child, &top_bs->children, next) { 42929ff7890SWen Congyang if (child->bs == bs || check_top_bs(child->bs, bs)) { 43029ff7890SWen Congyang return true; 43129ff7890SWen Congyang } 43229ff7890SWen Congyang } 43329ff7890SWen Congyang 43429ff7890SWen Congyang return false; 43529ff7890SWen Congyang } 43629ff7890SWen Congyang 43729ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 43829ff7890SWen Congyang Error **errp) 43929ff7890SWen Congyang { 44029ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 44129ff7890SWen Congyang BDRVReplicationState *s; 44229ff7890SWen Congyang BlockDriverState *top_bs; 44329ff7890SWen Congyang int64_t active_length, hidden_length, disk_length; 44429ff7890SWen Congyang AioContext *aio_context; 44529ff7890SWen Congyang Error *local_err = NULL; 446111049a4SJohn Snow BlockJob *job; 44729ff7890SWen Congyang 44829ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 44929ff7890SWen Congyang aio_context_acquire(aio_context); 45029ff7890SWen Congyang s = bs->opaque; 45129ff7890SWen Congyang 4523c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_NONE) { 45329ff7890SWen Congyang error_setg(errp, "Block replication is running or done"); 45429ff7890SWen Congyang aio_context_release(aio_context); 45529ff7890SWen Congyang return; 45629ff7890SWen Congyang } 45729ff7890SWen Congyang 45829ff7890SWen Congyang if (s->mode != mode) { 45929ff7890SWen Congyang error_setg(errp, "The parameter mode's value is invalid, needs %d," 46029ff7890SWen Congyang " but got %d", s->mode, mode); 46129ff7890SWen Congyang aio_context_release(aio_context); 46229ff7890SWen Congyang return; 46329ff7890SWen Congyang } 46429ff7890SWen Congyang 46529ff7890SWen Congyang switch (s->mode) { 46629ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 46729ff7890SWen Congyang break; 46829ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 46929ff7890SWen Congyang s->active_disk = bs->file; 47029ff7890SWen Congyang if (!s->active_disk || !s->active_disk->bs || 47129ff7890SWen Congyang !s->active_disk->bs->backing) { 47229ff7890SWen Congyang error_setg(errp, "Active disk doesn't have backing file"); 47329ff7890SWen Congyang aio_context_release(aio_context); 47429ff7890SWen Congyang return; 47529ff7890SWen Congyang } 47629ff7890SWen Congyang 47729ff7890SWen Congyang s->hidden_disk = s->active_disk->bs->backing; 47829ff7890SWen Congyang if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { 47929ff7890SWen Congyang error_setg(errp, "Hidden disk doesn't have backing file"); 48029ff7890SWen Congyang aio_context_release(aio_context); 48129ff7890SWen Congyang return; 48229ff7890SWen Congyang } 48329ff7890SWen Congyang 48429ff7890SWen Congyang s->secondary_disk = s->hidden_disk->bs->backing; 48529ff7890SWen Congyang if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { 48629ff7890SWen Congyang error_setg(errp, "The secondary disk doesn't have block backend"); 48729ff7890SWen Congyang aio_context_release(aio_context); 48829ff7890SWen Congyang return; 48929ff7890SWen Congyang } 49029ff7890SWen Congyang 49129ff7890SWen Congyang /* verify the length */ 49229ff7890SWen Congyang active_length = bdrv_getlength(s->active_disk->bs); 49329ff7890SWen Congyang hidden_length = bdrv_getlength(s->hidden_disk->bs); 49429ff7890SWen Congyang disk_length = bdrv_getlength(s->secondary_disk->bs); 49529ff7890SWen Congyang if (active_length < 0 || hidden_length < 0 || disk_length < 0 || 49629ff7890SWen Congyang active_length != hidden_length || hidden_length != disk_length) { 49729ff7890SWen Congyang error_setg(errp, "Active disk, hidden disk, secondary disk's length" 49829ff7890SWen Congyang " are not the same"); 49929ff7890SWen Congyang aio_context_release(aio_context); 50029ff7890SWen Congyang return; 50129ff7890SWen Congyang } 50229ff7890SWen Congyang 50329ff7890SWen Congyang if (!s->active_disk->bs->drv->bdrv_make_empty || 50429ff7890SWen Congyang !s->hidden_disk->bs->drv->bdrv_make_empty) { 50529ff7890SWen Congyang error_setg(errp, 50629ff7890SWen Congyang "Active disk or hidden disk doesn't support make_empty"); 50729ff7890SWen Congyang aio_context_release(aio_context); 50829ff7890SWen Congyang return; 50929ff7890SWen Congyang } 51029ff7890SWen Congyang 51129ff7890SWen Congyang /* reopen the backing file in r/w mode */ 5128dd9006eSPaolo Bonzini reopen_backing_file(bs, true, &local_err); 51329ff7890SWen Congyang if (local_err) { 51429ff7890SWen Congyang error_propagate(errp, local_err); 51529ff7890SWen Congyang aio_context_release(aio_context); 51629ff7890SWen Congyang return; 51729ff7890SWen Congyang } 51829ff7890SWen Congyang 51929ff7890SWen Congyang /* start backup job now */ 52029ff7890SWen Congyang error_setg(&s->blocker, 52129ff7890SWen Congyang "Block device is in use by internal backup job"); 52229ff7890SWen Congyang 52329ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 52429ff7890SWen Congyang if (!top_bs || !bdrv_is_root_node(top_bs) || 52529ff7890SWen Congyang !check_top_bs(top_bs, bs)) { 52629ff7890SWen Congyang error_setg(errp, "No top_bs or it is invalid"); 5278dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 52829ff7890SWen Congyang aio_context_release(aio_context); 52929ff7890SWen Congyang return; 53029ff7890SWen Congyang } 53129ff7890SWen Congyang bdrv_op_block_all(top_bs, s->blocker); 53229ff7890SWen Congyang bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); 53329ff7890SWen Congyang 534111049a4SJohn Snow job = backup_job_create(NULL, s->secondary_disk->bs, s->hidden_disk->bs, 535111049a4SJohn Snow 0, MIRROR_SYNC_MODE_NONE, NULL, false, 536111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, 537111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, BLOCK_JOB_INTERNAL, 538111049a4SJohn Snow backup_job_completed, bs, NULL, &local_err); 53929ff7890SWen Congyang if (local_err) { 54029ff7890SWen Congyang error_propagate(errp, local_err); 5418dd9006eSPaolo Bonzini backup_job_cleanup(bs); 54229ff7890SWen Congyang aio_context_release(aio_context); 54329ff7890SWen Congyang return; 54429ff7890SWen Congyang } 545111049a4SJohn Snow block_job_start(job); 54629ff7890SWen Congyang break; 54729ff7890SWen Congyang default: 54829ff7890SWen Congyang aio_context_release(aio_context); 54929ff7890SWen Congyang abort(); 55029ff7890SWen Congyang } 55129ff7890SWen Congyang 5523c76c606SFam Zheng s->stage = BLOCK_REPLICATION_RUNNING; 55329ff7890SWen Congyang 55429ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 55529ff7890SWen Congyang secondary_do_checkpoint(s, errp); 55629ff7890SWen Congyang } 55729ff7890SWen Congyang 55829ff7890SWen Congyang s->error = 0; 55929ff7890SWen Congyang aio_context_release(aio_context); 56029ff7890SWen Congyang } 56129ff7890SWen Congyang 56229ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp) 56329ff7890SWen Congyang { 56429ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 56529ff7890SWen Congyang BDRVReplicationState *s; 56629ff7890SWen Congyang AioContext *aio_context; 56729ff7890SWen Congyang 56829ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 56929ff7890SWen Congyang aio_context_acquire(aio_context); 57029ff7890SWen Congyang s = bs->opaque; 57129ff7890SWen Congyang 57229ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 57329ff7890SWen Congyang secondary_do_checkpoint(s, errp); 57429ff7890SWen Congyang } 57529ff7890SWen Congyang aio_context_release(aio_context); 57629ff7890SWen Congyang } 57729ff7890SWen Congyang 57829ff7890SWen Congyang static void replication_get_error(ReplicationState *rs, Error **errp) 57929ff7890SWen Congyang { 58029ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 58129ff7890SWen Congyang BDRVReplicationState *s; 58229ff7890SWen Congyang AioContext *aio_context; 58329ff7890SWen Congyang 58429ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 58529ff7890SWen Congyang aio_context_acquire(aio_context); 58629ff7890SWen Congyang s = bs->opaque; 58729ff7890SWen Congyang 5883c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_RUNNING) { 58929ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 59029ff7890SWen Congyang aio_context_release(aio_context); 59129ff7890SWen Congyang return; 59229ff7890SWen Congyang } 59329ff7890SWen Congyang 59429ff7890SWen Congyang if (s->error) { 59529ff7890SWen Congyang error_setg(errp, "I/O error occurred"); 59629ff7890SWen Congyang aio_context_release(aio_context); 59729ff7890SWen Congyang return; 59829ff7890SWen Congyang } 59929ff7890SWen Congyang aio_context_release(aio_context); 60029ff7890SWen Congyang } 60129ff7890SWen Congyang 60229ff7890SWen Congyang static void replication_done(void *opaque, int ret) 60329ff7890SWen Congyang { 60429ff7890SWen Congyang BlockDriverState *bs = opaque; 60529ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 60629ff7890SWen Congyang 60729ff7890SWen Congyang if (ret == 0) { 6083c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 60929ff7890SWen Congyang 61029ff7890SWen Congyang /* refresh top bs's filename */ 61129ff7890SWen Congyang bdrv_refresh_filename(bs); 61229ff7890SWen Congyang s->active_disk = NULL; 61329ff7890SWen Congyang s->secondary_disk = NULL; 61429ff7890SWen Congyang s->hidden_disk = NULL; 61529ff7890SWen Congyang s->error = 0; 61629ff7890SWen Congyang } else { 6173c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; 61829ff7890SWen Congyang s->error = -EIO; 61929ff7890SWen Congyang } 62029ff7890SWen Congyang } 62129ff7890SWen Congyang 62229ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, Error **errp) 62329ff7890SWen Congyang { 62429ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 62529ff7890SWen Congyang BDRVReplicationState *s; 62629ff7890SWen Congyang AioContext *aio_context; 62729ff7890SWen Congyang 62829ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 62929ff7890SWen Congyang aio_context_acquire(aio_context); 63029ff7890SWen Congyang s = bs->opaque; 63129ff7890SWen Congyang 6323c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_RUNNING) { 63329ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 63429ff7890SWen Congyang aio_context_release(aio_context); 63529ff7890SWen Congyang return; 63629ff7890SWen Congyang } 63729ff7890SWen Congyang 63829ff7890SWen Congyang switch (s->mode) { 63929ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 6403c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 64129ff7890SWen Congyang s->error = 0; 64229ff7890SWen Congyang break; 64329ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 64429ff7890SWen Congyang /* 64529ff7890SWen Congyang * This BDS will be closed, and the job should be completed 64629ff7890SWen Congyang * before the BDS is closed, because we will access hidden 64729ff7890SWen Congyang * disk, secondary disk in backup_job_completed(). 64829ff7890SWen Congyang */ 64929ff7890SWen Congyang if (s->secondary_disk->bs->job) { 65029ff7890SWen Congyang block_job_cancel_sync(s->secondary_disk->bs->job); 65129ff7890SWen Congyang } 65229ff7890SWen Congyang 65329ff7890SWen Congyang if (!failover) { 65429ff7890SWen Congyang secondary_do_checkpoint(s, errp); 6553c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 65629ff7890SWen Congyang aio_context_release(aio_context); 65729ff7890SWen Congyang return; 65829ff7890SWen Congyang } 65929ff7890SWen Congyang 6603c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER; 66147970dfbSJohn Snow commit_active_start(NULL, s->active_disk->bs, s->secondary_disk->bs, 66247970dfbSJohn Snow BLOCK_JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, 66378bbd910SFam Zheng NULL, replication_done, bs, true, errp); 66429ff7890SWen Congyang break; 66529ff7890SWen Congyang default: 66629ff7890SWen Congyang aio_context_release(aio_context); 66729ff7890SWen Congyang abort(); 66829ff7890SWen Congyang } 66929ff7890SWen Congyang aio_context_release(aio_context); 67029ff7890SWen Congyang } 67129ff7890SWen Congyang 67229ff7890SWen Congyang BlockDriver bdrv_replication = { 67329ff7890SWen Congyang .format_name = "replication", 67429ff7890SWen Congyang .protocol_name = "replication", 67529ff7890SWen Congyang .instance_size = sizeof(BDRVReplicationState), 67629ff7890SWen Congyang 67729ff7890SWen Congyang .bdrv_open = replication_open, 67829ff7890SWen Congyang .bdrv_close = replication_close, 67937a9051cSChanglong Xie .bdrv_child_perm = replication_child_perm, 68029ff7890SWen Congyang 68129ff7890SWen Congyang .bdrv_getlength = replication_getlength, 68229ff7890SWen Congyang .bdrv_co_readv = replication_co_readv, 68329ff7890SWen Congyang .bdrv_co_writev = replication_co_writev, 68429ff7890SWen Congyang 68529ff7890SWen Congyang .is_filter = true, 68629ff7890SWen Congyang .bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter, 68729ff7890SWen Congyang 68829ff7890SWen Congyang .has_variable_length = true, 68929ff7890SWen Congyang }; 69029ff7890SWen Congyang 69129ff7890SWen Congyang static void bdrv_replication_init(void) 69229ff7890SWen Congyang { 69329ff7890SWen Congyang bdrv_register(&bdrv_replication); 69429ff7890SWen Congyang } 69529ff7890SWen Congyang 69629ff7890SWen Congyang block_init(bdrv_replication_init); 697