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" 160b8fa32fSMarkus Armbruster #include "qemu/module.h" 17922a01a0SMarkus Armbruster #include "qemu/option.h" 1829ff7890SWen Congyang #include "block/nbd.h" 1929ff7890SWen Congyang #include "block/blockjob.h" 2029ff7890SWen Congyang #include "block/block_int.h" 2129ff7890SWen Congyang #include "block/block_backup.h" 2229ff7890SWen Congyang #include "sysemu/block-backend.h" 2329ff7890SWen Congyang #include "qapi/error.h" 243c4e9647SAlberto Garcia #include "qapi/qmp/qdict.h" 2529ff7890SWen Congyang #include "replication.h" 2629ff7890SWen Congyang 273c76c606SFam Zheng typedef enum { 283c76c606SFam Zheng BLOCK_REPLICATION_NONE, /* block replication is not started */ 293c76c606SFam Zheng BLOCK_REPLICATION_RUNNING, /* block replication is running */ 303c76c606SFam Zheng BLOCK_REPLICATION_FAILOVER, /* failover is running in background */ 313c76c606SFam Zheng BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */ 323c76c606SFam Zheng BLOCK_REPLICATION_DONE, /* block replication is done */ 333c76c606SFam Zheng } ReplicationStage; 343c76c606SFam Zheng 3529ff7890SWen Congyang typedef struct BDRVReplicationState { 3629ff7890SWen Congyang ReplicationMode mode; 373c76c606SFam Zheng ReplicationStage stage; 3829ff7890SWen Congyang BdrvChild *active_disk; 39cc19f177SVladimir Sementsov-Ogievskiy BlockJob *commit_job; 4029ff7890SWen Congyang BdrvChild *hidden_disk; 4129ff7890SWen Congyang BdrvChild *secondary_disk; 42cc19f177SVladimir Sementsov-Ogievskiy BlockJob *backup_job; 4329ff7890SWen Congyang char *top_id; 4429ff7890SWen Congyang ReplicationState *rs; 4529ff7890SWen Congyang Error *blocker; 463c4e9647SAlberto Garcia bool orig_hidden_read_only; 473c4e9647SAlberto Garcia bool orig_secondary_read_only; 4829ff7890SWen Congyang int error; 4929ff7890SWen Congyang } BDRVReplicationState; 5029ff7890SWen Congyang 5129ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 5229ff7890SWen Congyang Error **errp); 5329ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp); 5429ff7890SWen Congyang static void replication_get_error(ReplicationState *rs, Error **errp); 5529ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, 5629ff7890SWen Congyang Error **errp); 5729ff7890SWen Congyang 5829ff7890SWen Congyang #define REPLICATION_MODE "mode" 5929ff7890SWen Congyang #define REPLICATION_TOP_ID "top-id" 6029ff7890SWen Congyang static QemuOptsList replication_runtime_opts = { 6129ff7890SWen Congyang .name = "replication", 6229ff7890SWen Congyang .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), 6329ff7890SWen Congyang .desc = { 6429ff7890SWen Congyang { 6529ff7890SWen Congyang .name = REPLICATION_MODE, 6629ff7890SWen Congyang .type = QEMU_OPT_STRING, 6729ff7890SWen Congyang }, 6829ff7890SWen Congyang { 6929ff7890SWen Congyang .name = REPLICATION_TOP_ID, 7029ff7890SWen Congyang .type = QEMU_OPT_STRING, 7129ff7890SWen Congyang }, 7229ff7890SWen Congyang { /* end of list */ } 7329ff7890SWen Congyang }, 7429ff7890SWen Congyang }; 7529ff7890SWen Congyang 7629ff7890SWen Congyang static ReplicationOps replication_ops = { 7729ff7890SWen Congyang .start = replication_start, 7829ff7890SWen Congyang .checkpoint = replication_do_checkpoint, 7929ff7890SWen Congyang .get_error = replication_get_error, 8029ff7890SWen Congyang .stop = replication_stop, 8129ff7890SWen Congyang }; 8229ff7890SWen Congyang 8329ff7890SWen Congyang static int replication_open(BlockDriverState *bs, QDict *options, 8429ff7890SWen Congyang int flags, Error **errp) 8529ff7890SWen Congyang { 8629ff7890SWen Congyang int ret; 8729ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 8829ff7890SWen Congyang Error *local_err = NULL; 8929ff7890SWen Congyang QemuOpts *opts = NULL; 9029ff7890SWen Congyang const char *mode; 9129ff7890SWen Congyang const char *top_id; 9229ff7890SWen Congyang 93*b3af2af4SMax Reitz bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, 94*b3af2af4SMax Reitz BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, 954e4bf5c4SKevin Wolf false, errp); 964e4bf5c4SKevin Wolf if (!bs->file) { 974e4bf5c4SKevin Wolf return -EINVAL; 984e4bf5c4SKevin Wolf } 994e4bf5c4SKevin Wolf 10029ff7890SWen Congyang ret = -EINVAL; 10129ff7890SWen Congyang opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); 10229ff7890SWen Congyang qemu_opts_absorb_qdict(opts, options, &local_err); 10329ff7890SWen Congyang if (local_err) { 10429ff7890SWen Congyang goto fail; 10529ff7890SWen Congyang } 10629ff7890SWen Congyang 10729ff7890SWen Congyang mode = qemu_opt_get(opts, REPLICATION_MODE); 10829ff7890SWen Congyang if (!mode) { 10929ff7890SWen Congyang error_setg(&local_err, "Missing the option mode"); 11029ff7890SWen Congyang goto fail; 11129ff7890SWen Congyang } 11229ff7890SWen Congyang 11329ff7890SWen Congyang if (!strcmp(mode, "primary")) { 11429ff7890SWen Congyang s->mode = REPLICATION_MODE_PRIMARY; 115f4f2539bSChanglong Xie top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 116f4f2539bSChanglong Xie if (top_id) { 117f4f2539bSChanglong Xie error_setg(&local_err, "The primary side does not support option top-id"); 118f4f2539bSChanglong Xie goto fail; 119f4f2539bSChanglong Xie } 12029ff7890SWen Congyang } else if (!strcmp(mode, "secondary")) { 12129ff7890SWen Congyang s->mode = REPLICATION_MODE_SECONDARY; 12229ff7890SWen Congyang top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 12329ff7890SWen Congyang s->top_id = g_strdup(top_id); 12429ff7890SWen Congyang if (!s->top_id) { 12529ff7890SWen Congyang error_setg(&local_err, "Missing the option top-id"); 12629ff7890SWen Congyang goto fail; 12729ff7890SWen Congyang } 12829ff7890SWen Congyang } else { 12929ff7890SWen Congyang error_setg(&local_err, 13029ff7890SWen Congyang "The option mode's value should be primary or secondary"); 13129ff7890SWen Congyang goto fail; 13229ff7890SWen Congyang } 13329ff7890SWen Congyang 13429ff7890SWen Congyang s->rs = replication_new(bs, &replication_ops); 13529ff7890SWen Congyang 13629ff7890SWen Congyang ret = 0; 13729ff7890SWen Congyang 13829ff7890SWen Congyang fail: 13929ff7890SWen Congyang qemu_opts_del(opts); 14029ff7890SWen Congyang error_propagate(errp, local_err); 14129ff7890SWen Congyang 14229ff7890SWen Congyang return ret; 14329ff7890SWen Congyang } 14429ff7890SWen Congyang 14529ff7890SWen Congyang static void replication_close(BlockDriverState *bs) 14629ff7890SWen Congyang { 14729ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 14808558e33SStefan Reiter Job *commit_job; 14929ff7890SWen Congyang 1503c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_RUNNING) { 15129ff7890SWen Congyang replication_stop(s->rs, false, NULL); 15229ff7890SWen Congyang } 1533c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_FAILOVER) { 15408558e33SStefan Reiter commit_job = &s->commit_job->job; 15508558e33SStefan Reiter assert(commit_job->aio_context == qemu_get_current_aio_context()); 15608558e33SStefan Reiter job_cancel_sync(commit_job); 15750ab0e09SPaolo Bonzini } 15829ff7890SWen Congyang 15929ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 16029ff7890SWen Congyang g_free(s->top_id); 16129ff7890SWen Congyang } 16229ff7890SWen Congyang 16329ff7890SWen Congyang replication_remove(s->rs); 16429ff7890SWen Congyang } 16529ff7890SWen Congyang 16637a9051cSChanglong Xie static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, 167bd86fb99SMax Reitz const BdrvChildClass *child_class, 168bf8e925eSMax Reitz BdrvChildRole role, 169e0995dc3SKevin Wolf BlockReopenQueue *reopen_queue, 17037a9051cSChanglong Xie uint64_t perm, uint64_t shared, 17137a9051cSChanglong Xie uint64_t *nperm, uint64_t *nshared) 17237a9051cSChanglong Xie { 173611e0653SWang Guang *nperm = BLK_PERM_CONSISTENT_READ; 174611e0653SWang Guang if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { 175611e0653SWang Guang *nperm |= BLK_PERM_WRITE; 176611e0653SWang Guang } 17778ee6bd0SPhilippe Mathieu-Daudé *nshared = BLK_PERM_CONSISTENT_READ 17878ee6bd0SPhilippe Mathieu-Daudé | BLK_PERM_WRITE 17937a9051cSChanglong Xie | BLK_PERM_WRITE_UNCHANGED; 18037a9051cSChanglong Xie return; 18137a9051cSChanglong Xie } 18237a9051cSChanglong Xie 18329ff7890SWen Congyang static int64_t replication_getlength(BlockDriverState *bs) 18429ff7890SWen Congyang { 18529ff7890SWen Congyang return bdrv_getlength(bs->file->bs); 18629ff7890SWen Congyang } 18729ff7890SWen Congyang 18829ff7890SWen Congyang static int replication_get_io_status(BDRVReplicationState *s) 18929ff7890SWen Congyang { 1903c76c606SFam Zheng switch (s->stage) { 19129ff7890SWen Congyang case BLOCK_REPLICATION_NONE: 19229ff7890SWen Congyang return -EIO; 19329ff7890SWen Congyang case BLOCK_REPLICATION_RUNNING: 19429ff7890SWen Congyang return 0; 19529ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER: 19629ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 19729ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER_FAILED: 19829ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; 19929ff7890SWen Congyang case BLOCK_REPLICATION_DONE: 20029ff7890SWen Congyang /* 20129ff7890SWen Congyang * active commit job completes, and active disk and secondary_disk 20229ff7890SWen Congyang * is swapped, so we can operate bs->file directly 20329ff7890SWen Congyang */ 20429ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 20529ff7890SWen Congyang default: 20629ff7890SWen Congyang abort(); 20729ff7890SWen Congyang } 20829ff7890SWen Congyang } 20929ff7890SWen Congyang 21029ff7890SWen Congyang static int replication_return_value(BDRVReplicationState *s, int ret) 21129ff7890SWen Congyang { 21229ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 21329ff7890SWen Congyang return ret; 21429ff7890SWen Congyang } 21529ff7890SWen Congyang 21629ff7890SWen Congyang if (ret < 0) { 21729ff7890SWen Congyang s->error = ret; 21829ff7890SWen Congyang ret = 0; 21929ff7890SWen Congyang } 22029ff7890SWen Congyang 22129ff7890SWen Congyang return ret; 22229ff7890SWen Congyang } 22329ff7890SWen Congyang 22429ff7890SWen Congyang static coroutine_fn int replication_co_readv(BlockDriverState *bs, 22529ff7890SWen Congyang int64_t sector_num, 22629ff7890SWen Congyang int remaining_sectors, 22729ff7890SWen Congyang QEMUIOVector *qiov) 22829ff7890SWen Congyang { 22929ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 23029ff7890SWen Congyang int ret; 23129ff7890SWen Congyang 23229ff7890SWen Congyang if (s->mode == REPLICATION_MODE_PRIMARY) { 23329ff7890SWen Congyang /* We only use it to forward primary write requests */ 23429ff7890SWen Congyang return -EIO; 23529ff7890SWen Congyang } 23629ff7890SWen Congyang 23729ff7890SWen Congyang ret = replication_get_io_status(s); 23829ff7890SWen Congyang if (ret < 0) { 23929ff7890SWen Congyang return ret; 24029ff7890SWen Congyang } 24129ff7890SWen Congyang 24204a11d87SEric Blake ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, 24304a11d87SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 244e4f9752cSVladimir Sementsov-Ogievskiy 24529ff7890SWen Congyang return replication_return_value(s, ret); 24629ff7890SWen Congyang } 24729ff7890SWen Congyang 24829ff7890SWen Congyang static coroutine_fn int replication_co_writev(BlockDriverState *bs, 24929ff7890SWen Congyang int64_t sector_num, 25029ff7890SWen Congyang int remaining_sectors, 251e18a58b4SEric Blake QEMUIOVector *qiov, 252e18a58b4SEric Blake int flags) 25329ff7890SWen Congyang { 25429ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 25529ff7890SWen Congyang QEMUIOVector hd_qiov; 25629ff7890SWen Congyang uint64_t bytes_done = 0; 25729ff7890SWen Congyang BdrvChild *top = bs->file; 25829ff7890SWen Congyang BdrvChild *base = s->secondary_disk; 25929ff7890SWen Congyang BdrvChild *target; 26051b0a488SEric Blake int ret; 26151b0a488SEric Blake int64_t n; 26229ff7890SWen Congyang 263e18a58b4SEric Blake assert(!flags); 26429ff7890SWen Congyang ret = replication_get_io_status(s); 26529ff7890SWen Congyang if (ret < 0) { 26629ff7890SWen Congyang goto out; 26729ff7890SWen Congyang } 26829ff7890SWen Congyang 26929ff7890SWen Congyang if (ret == 0) { 27004a11d87SEric Blake ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, 27104a11d87SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 27229ff7890SWen Congyang return replication_return_value(s, ret); 27329ff7890SWen Congyang } 27429ff7890SWen Congyang 27529ff7890SWen Congyang /* 27629ff7890SWen Congyang * Failover failed, only write to active disk if the sectors 27729ff7890SWen Congyang * have already been allocated in active disk/hidden disk. 27829ff7890SWen Congyang */ 27929ff7890SWen Congyang qemu_iovec_init(&hd_qiov, qiov->niov); 28029ff7890SWen Congyang while (remaining_sectors > 0) { 28151b0a488SEric Blake int64_t count; 28251b0a488SEric Blake 283170d3bd3SAndrey Shinkevich ret = bdrv_is_allocated_above(top->bs, base->bs, false, 28451b0a488SEric Blake sector_num * BDRV_SECTOR_SIZE, 28551b0a488SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, 28651b0a488SEric Blake &count); 28729ff7890SWen Congyang if (ret < 0) { 28829ff7890SWen Congyang goto out1; 28929ff7890SWen Congyang } 29029ff7890SWen Congyang 29151b0a488SEric Blake assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); 29251b0a488SEric Blake n = count >> BDRV_SECTOR_BITS; 29329ff7890SWen Congyang qemu_iovec_reset(&hd_qiov); 29451b0a488SEric Blake qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); 29529ff7890SWen Congyang 29629ff7890SWen Congyang target = ret ? top : base; 29704a11d87SEric Blake ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, 29804a11d87SEric Blake n * BDRV_SECTOR_SIZE, &hd_qiov, 0); 29929ff7890SWen Congyang if (ret < 0) { 30029ff7890SWen Congyang goto out1; 30129ff7890SWen Congyang } 30229ff7890SWen Congyang 30329ff7890SWen Congyang remaining_sectors -= n; 30429ff7890SWen Congyang sector_num += n; 30551b0a488SEric Blake bytes_done += count; 30629ff7890SWen Congyang } 30729ff7890SWen Congyang 30829ff7890SWen Congyang out1: 30929ff7890SWen Congyang qemu_iovec_destroy(&hd_qiov); 31029ff7890SWen Congyang out: 31129ff7890SWen Congyang return ret; 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 319cc19f177SVladimir Sementsov-Ogievskiy if (!s->backup_job) { 32029ff7890SWen Congyang error_setg(errp, "Backup job was cancelled unexpectedly"); 32129ff7890SWen Congyang return; 32229ff7890SWen Congyang } 32329ff7890SWen Congyang 324cc19f177SVladimir Sementsov-Ogievskiy backup_do_checkpoint(s->backup_job, &local_err); 32529ff7890SWen Congyang if (local_err) { 32629ff7890SWen Congyang error_propagate(errp, local_err); 32729ff7890SWen Congyang return; 32829ff7890SWen Congyang } 32929ff7890SWen Congyang 330d470ad42SMax Reitz if (!s->active_disk->bs->drv) { 331d470ad42SMax Reitz error_setg(errp, "Active disk %s is ejected", 332d470ad42SMax Reitz s->active_disk->bs->node_name); 333d470ad42SMax Reitz return; 334d470ad42SMax Reitz } 335d470ad42SMax Reitz 336f844ec01SMax Reitz ret = bdrv_make_empty(s->active_disk, errp); 33729ff7890SWen Congyang if (ret < 0) { 33829ff7890SWen Congyang return; 33929ff7890SWen Congyang } 34029ff7890SWen Congyang 341d470ad42SMax Reitz if (!s->hidden_disk->bs->drv) { 342d470ad42SMax Reitz error_setg(errp, "Hidden disk %s is ejected", 343d470ad42SMax Reitz s->hidden_disk->bs->node_name); 344d470ad42SMax Reitz return; 345d470ad42SMax Reitz } 346d470ad42SMax Reitz 3476ecbc6c5SKevin Wolf BlockBackend *blk = blk_new(qemu_get_current_aio_context(), 3486ecbc6c5SKevin Wolf BLK_PERM_WRITE, BLK_PERM_ALL); 3496ecbc6c5SKevin Wolf blk_insert_bs(blk, s->hidden_disk->bs, &local_err); 3506ecbc6c5SKevin Wolf if (local_err) { 3516ecbc6c5SKevin Wolf error_propagate(errp, local_err); 3526ecbc6c5SKevin Wolf blk_unref(blk); 3536ecbc6c5SKevin Wolf return; 3546ecbc6c5SKevin Wolf } 3556ecbc6c5SKevin Wolf 3566ecbc6c5SKevin Wolf ret = blk_make_empty(blk, errp); 3576ecbc6c5SKevin Wolf blk_unref(blk); 35829ff7890SWen Congyang if (ret < 0) { 35929ff7890SWen Congyang return; 36029ff7890SWen Congyang } 36129ff7890SWen Congyang } 36229ff7890SWen Congyang 3633c4e9647SAlberto Garcia /* This function is supposed to be called twice: 3643c4e9647SAlberto Garcia * first with writable = true, then with writable = false. 3653c4e9647SAlberto Garcia * The first call puts s->hidden_disk and s->secondary_disk in 3663c4e9647SAlberto Garcia * r/w mode, and the second puts them back in their original state. 3673c4e9647SAlberto Garcia */ 3688dd9006eSPaolo Bonzini static void reopen_backing_file(BlockDriverState *bs, bool writable, 36929ff7890SWen Congyang Error **errp) 37029ff7890SWen Congyang { 3718dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 37229ff7890SWen Congyang BlockReopenQueue *reopen_queue = NULL; 37329ff7890SWen Congyang Error *local_err = NULL; 37429ff7890SWen Congyang 37529ff7890SWen Congyang if (writable) { 3763c4e9647SAlberto Garcia s->orig_hidden_read_only = bdrv_is_read_only(s->hidden_disk->bs); 3773c4e9647SAlberto Garcia s->orig_secondary_read_only = bdrv_is_read_only(s->secondary_disk->bs); 37829ff7890SWen Congyang } 37929ff7890SWen Congyang 3801a63a907SKevin Wolf bdrv_subtree_drained_begin(s->hidden_disk->bs); 3811a63a907SKevin Wolf bdrv_subtree_drained_begin(s->secondary_disk->bs); 3821a63a907SKevin Wolf 3833c4e9647SAlberto Garcia if (s->orig_hidden_read_only) { 3843c4e9647SAlberto Garcia QDict *opts = qdict_new(); 3853c4e9647SAlberto Garcia qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 3863c4e9647SAlberto Garcia reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, 387077e8e20SAlberto Garcia opts, true); 38829ff7890SWen Congyang } 38929ff7890SWen Congyang 3903c4e9647SAlberto Garcia if (s->orig_secondary_read_only) { 3913c4e9647SAlberto Garcia QDict *opts = qdict_new(); 3923c4e9647SAlberto Garcia qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 39329ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, 394077e8e20SAlberto Garcia opts, true); 39529ff7890SWen Congyang } 39629ff7890SWen Congyang 39729ff7890SWen Congyang if (reopen_queue) { 3985019aeceSAlberto Garcia bdrv_reopen_multiple(reopen_queue, &local_err); 39929ff7890SWen Congyang error_propagate(errp, local_err); 40029ff7890SWen Congyang } 4011a63a907SKevin Wolf 4021a63a907SKevin Wolf bdrv_subtree_drained_end(s->hidden_disk->bs); 4031a63a907SKevin Wolf bdrv_subtree_drained_end(s->secondary_disk->bs); 40429ff7890SWen Congyang } 40529ff7890SWen Congyang 4068dd9006eSPaolo Bonzini static void backup_job_cleanup(BlockDriverState *bs) 40729ff7890SWen Congyang { 4088dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 40929ff7890SWen Congyang BlockDriverState *top_bs; 41029ff7890SWen Congyang 411e140f4b7SLukas Straub s->backup_job = NULL; 412e140f4b7SLukas Straub 41329ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 41429ff7890SWen Congyang if (!top_bs) { 41529ff7890SWen Congyang return; 41629ff7890SWen Congyang } 41729ff7890SWen Congyang bdrv_op_unblock_all(top_bs, s->blocker); 41829ff7890SWen Congyang error_free(s->blocker); 4198dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 42029ff7890SWen Congyang } 42129ff7890SWen Congyang 42229ff7890SWen Congyang static void backup_job_completed(void *opaque, int ret) 42329ff7890SWen Congyang { 4248dd9006eSPaolo Bonzini BlockDriverState *bs = opaque; 4258dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 42629ff7890SWen Congyang 4273c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_FAILOVER) { 42829ff7890SWen Congyang /* The backup job is cancelled unexpectedly */ 42929ff7890SWen Congyang s->error = -EIO; 43029ff7890SWen Congyang } 43129ff7890SWen Congyang 4328dd9006eSPaolo Bonzini backup_job_cleanup(bs); 43329ff7890SWen Congyang } 43429ff7890SWen Congyang 43529ff7890SWen Congyang static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) 43629ff7890SWen Congyang { 43729ff7890SWen Congyang BdrvChild *child; 43829ff7890SWen Congyang 43929ff7890SWen Congyang /* The bs itself is the top_bs */ 44029ff7890SWen Congyang if (top_bs == bs) { 44129ff7890SWen Congyang return true; 44229ff7890SWen Congyang } 44329ff7890SWen Congyang 44429ff7890SWen Congyang /* Iterate over top_bs's children */ 44529ff7890SWen Congyang QLIST_FOREACH(child, &top_bs->children, next) { 44629ff7890SWen Congyang if (child->bs == bs || check_top_bs(child->bs, bs)) { 44729ff7890SWen Congyang return true; 44829ff7890SWen Congyang } 44929ff7890SWen Congyang } 45029ff7890SWen Congyang 45129ff7890SWen Congyang return false; 45229ff7890SWen Congyang } 45329ff7890SWen Congyang 45429ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 45529ff7890SWen Congyang Error **errp) 45629ff7890SWen Congyang { 45729ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 45829ff7890SWen Congyang BDRVReplicationState *s; 45929ff7890SWen Congyang BlockDriverState *top_bs; 46029ff7890SWen Congyang int64_t active_length, hidden_length, disk_length; 46129ff7890SWen Congyang AioContext *aio_context; 46229ff7890SWen Congyang Error *local_err = NULL; 46329ff7890SWen Congyang 46429ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 46529ff7890SWen Congyang aio_context_acquire(aio_context); 46629ff7890SWen Congyang s = bs->opaque; 46729ff7890SWen Congyang 46808ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_DONE || 46908ddb4ebSLukas Straub s->stage == BLOCK_REPLICATION_FAILOVER) { 47008ddb4ebSLukas Straub /* 47108ddb4ebSLukas Straub * This case happens when a secondary is promoted to primary. 47208ddb4ebSLukas Straub * Ignore the request because the secondary side of replication 47308ddb4ebSLukas Straub * doesn't have to do anything anymore. 47408ddb4ebSLukas Straub */ 47508ddb4ebSLukas Straub aio_context_release(aio_context); 47608ddb4ebSLukas Straub return; 47708ddb4ebSLukas Straub } 47808ddb4ebSLukas Straub 4793c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_NONE) { 48029ff7890SWen Congyang error_setg(errp, "Block replication is running or done"); 48129ff7890SWen Congyang aio_context_release(aio_context); 48229ff7890SWen Congyang return; 48329ff7890SWen Congyang } 48429ff7890SWen Congyang 48529ff7890SWen Congyang if (s->mode != mode) { 48629ff7890SWen Congyang error_setg(errp, "The parameter mode's value is invalid, needs %d," 48729ff7890SWen Congyang " but got %d", s->mode, mode); 48829ff7890SWen Congyang aio_context_release(aio_context); 48929ff7890SWen Congyang return; 49029ff7890SWen Congyang } 49129ff7890SWen Congyang 49229ff7890SWen Congyang switch (s->mode) { 49329ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 49429ff7890SWen Congyang break; 49529ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 49629ff7890SWen Congyang s->active_disk = bs->file; 49729ff7890SWen Congyang if (!s->active_disk || !s->active_disk->bs || 49829ff7890SWen Congyang !s->active_disk->bs->backing) { 49929ff7890SWen Congyang error_setg(errp, "Active disk doesn't have backing file"); 50029ff7890SWen Congyang aio_context_release(aio_context); 50129ff7890SWen Congyang return; 50229ff7890SWen Congyang } 50329ff7890SWen Congyang 50429ff7890SWen Congyang s->hidden_disk = s->active_disk->bs->backing; 50529ff7890SWen Congyang if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { 50629ff7890SWen Congyang error_setg(errp, "Hidden disk doesn't have backing file"); 50729ff7890SWen Congyang aio_context_release(aio_context); 50829ff7890SWen Congyang return; 50929ff7890SWen Congyang } 51029ff7890SWen Congyang 51129ff7890SWen Congyang s->secondary_disk = s->hidden_disk->bs->backing; 51229ff7890SWen Congyang if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { 51329ff7890SWen Congyang error_setg(errp, "The secondary disk doesn't have block backend"); 51429ff7890SWen Congyang aio_context_release(aio_context); 51529ff7890SWen Congyang return; 51629ff7890SWen Congyang } 51729ff7890SWen Congyang 51829ff7890SWen Congyang /* verify the length */ 51929ff7890SWen Congyang active_length = bdrv_getlength(s->active_disk->bs); 52029ff7890SWen Congyang hidden_length = bdrv_getlength(s->hidden_disk->bs); 52129ff7890SWen Congyang disk_length = bdrv_getlength(s->secondary_disk->bs); 52229ff7890SWen Congyang if (active_length < 0 || hidden_length < 0 || disk_length < 0 || 52329ff7890SWen Congyang active_length != hidden_length || hidden_length != disk_length) { 52429ff7890SWen Congyang error_setg(errp, "Active disk, hidden disk, secondary disk's length" 52529ff7890SWen Congyang " are not the same"); 52629ff7890SWen Congyang aio_context_release(aio_context); 52729ff7890SWen Congyang return; 52829ff7890SWen Congyang } 52929ff7890SWen Congyang 530d470ad42SMax Reitz /* Must be true, or the bdrv_getlength() calls would have failed */ 531d470ad42SMax Reitz assert(s->active_disk->bs->drv && s->hidden_disk->bs->drv); 532d470ad42SMax Reitz 53329ff7890SWen Congyang if (!s->active_disk->bs->drv->bdrv_make_empty || 53429ff7890SWen Congyang !s->hidden_disk->bs->drv->bdrv_make_empty) { 53529ff7890SWen Congyang error_setg(errp, 53629ff7890SWen Congyang "Active disk or hidden disk doesn't support make_empty"); 53729ff7890SWen Congyang aio_context_release(aio_context); 53829ff7890SWen Congyang return; 53929ff7890SWen Congyang } 54029ff7890SWen Congyang 54129ff7890SWen Congyang /* reopen the backing file in r/w mode */ 5428dd9006eSPaolo Bonzini reopen_backing_file(bs, true, &local_err); 54329ff7890SWen Congyang if (local_err) { 54429ff7890SWen Congyang error_propagate(errp, local_err); 54529ff7890SWen Congyang aio_context_release(aio_context); 54629ff7890SWen Congyang return; 54729ff7890SWen Congyang } 54829ff7890SWen Congyang 54929ff7890SWen Congyang /* start backup job now */ 55029ff7890SWen Congyang error_setg(&s->blocker, 55129ff7890SWen Congyang "Block device is in use by internal backup job"); 55229ff7890SWen Congyang 55329ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 55429ff7890SWen Congyang if (!top_bs || !bdrv_is_root_node(top_bs) || 55529ff7890SWen Congyang !check_top_bs(top_bs, bs)) { 55629ff7890SWen Congyang error_setg(errp, "No top_bs or it is invalid"); 5578dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 55829ff7890SWen Congyang aio_context_release(aio_context); 55929ff7890SWen Congyang return; 56029ff7890SWen Congyang } 56129ff7890SWen Congyang bdrv_op_block_all(top_bs, s->blocker); 56229ff7890SWen Congyang bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); 56329ff7890SWen Congyang 564cc19f177SVladimir Sementsov-Ogievskiy s->backup_job = backup_job_create( 565cc19f177SVladimir Sementsov-Ogievskiy NULL, s->secondary_disk->bs, s->hidden_disk->bs, 56600e30f05SVladimir Sementsov-Ogievskiy 0, MIRROR_SYNC_MODE_NONE, NULL, 0, false, NULL, 567111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, 568bb02b65cSKevin Wolf BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, 569111049a4SJohn Snow backup_job_completed, bs, NULL, &local_err); 57029ff7890SWen Congyang if (local_err) { 57129ff7890SWen Congyang error_propagate(errp, local_err); 5728dd9006eSPaolo Bonzini backup_job_cleanup(bs); 57329ff7890SWen Congyang aio_context_release(aio_context); 57429ff7890SWen Congyang return; 57529ff7890SWen Congyang } 576cc19f177SVladimir Sementsov-Ogievskiy job_start(&s->backup_job->job); 57729ff7890SWen Congyang break; 57829ff7890SWen Congyang default: 57929ff7890SWen Congyang aio_context_release(aio_context); 58029ff7890SWen Congyang abort(); 58129ff7890SWen Congyang } 58229ff7890SWen Congyang 5833c76c606SFam Zheng s->stage = BLOCK_REPLICATION_RUNNING; 58429ff7890SWen Congyang 58529ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 58629ff7890SWen Congyang secondary_do_checkpoint(s, errp); 58729ff7890SWen Congyang } 58829ff7890SWen Congyang 58929ff7890SWen Congyang s->error = 0; 59029ff7890SWen Congyang aio_context_release(aio_context); 59129ff7890SWen Congyang } 59229ff7890SWen Congyang 59329ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp) 59429ff7890SWen Congyang { 59529ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 59629ff7890SWen Congyang BDRVReplicationState *s; 59729ff7890SWen Congyang AioContext *aio_context; 59829ff7890SWen Congyang 59929ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 60029ff7890SWen Congyang aio_context_acquire(aio_context); 60129ff7890SWen Congyang s = bs->opaque; 60229ff7890SWen Congyang 60308ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_DONE || 60408ddb4ebSLukas Straub s->stage == BLOCK_REPLICATION_FAILOVER) { 60508ddb4ebSLukas Straub /* 60608ddb4ebSLukas Straub * This case happens when a secondary was promoted to primary. 60708ddb4ebSLukas Straub * Ignore the request because the secondary side of replication 60808ddb4ebSLukas Straub * doesn't have to do anything anymore. 60908ddb4ebSLukas Straub */ 61008ddb4ebSLukas Straub aio_context_release(aio_context); 61108ddb4ebSLukas Straub return; 61208ddb4ebSLukas Straub } 61308ddb4ebSLukas Straub 61429ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 61529ff7890SWen Congyang secondary_do_checkpoint(s, errp); 61629ff7890SWen Congyang } 61729ff7890SWen Congyang aio_context_release(aio_context); 61829ff7890SWen Congyang } 61929ff7890SWen Congyang 62029ff7890SWen Congyang static void replication_get_error(ReplicationState *rs, Error **errp) 62129ff7890SWen Congyang { 62229ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 62329ff7890SWen Congyang BDRVReplicationState *s; 62429ff7890SWen Congyang AioContext *aio_context; 62529ff7890SWen Congyang 62629ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 62729ff7890SWen Congyang aio_context_acquire(aio_context); 62829ff7890SWen Congyang s = bs->opaque; 62929ff7890SWen Congyang 63008ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_NONE) { 63129ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 63229ff7890SWen Congyang aio_context_release(aio_context); 63329ff7890SWen Congyang return; 63429ff7890SWen Congyang } 63529ff7890SWen Congyang 63629ff7890SWen Congyang if (s->error) { 63729ff7890SWen Congyang error_setg(errp, "I/O error occurred"); 63829ff7890SWen Congyang aio_context_release(aio_context); 63929ff7890SWen Congyang return; 64029ff7890SWen Congyang } 64129ff7890SWen Congyang aio_context_release(aio_context); 64229ff7890SWen Congyang } 64329ff7890SWen Congyang 64429ff7890SWen Congyang static void replication_done(void *opaque, int ret) 64529ff7890SWen Congyang { 64629ff7890SWen Congyang BlockDriverState *bs = opaque; 64729ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 64829ff7890SWen Congyang 64929ff7890SWen Congyang if (ret == 0) { 6503c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 65129ff7890SWen Congyang 65229ff7890SWen Congyang s->active_disk = NULL; 65329ff7890SWen Congyang s->secondary_disk = NULL; 65429ff7890SWen Congyang s->hidden_disk = NULL; 65529ff7890SWen Congyang s->error = 0; 65629ff7890SWen Congyang } else { 6573c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; 65829ff7890SWen Congyang s->error = -EIO; 65929ff7890SWen Congyang } 66029ff7890SWen Congyang } 66129ff7890SWen Congyang 66229ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, Error **errp) 66329ff7890SWen Congyang { 66429ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 66529ff7890SWen Congyang BDRVReplicationState *s; 66629ff7890SWen Congyang AioContext *aio_context; 66729ff7890SWen Congyang 66829ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 66929ff7890SWen Congyang aio_context_acquire(aio_context); 67029ff7890SWen Congyang s = bs->opaque; 67129ff7890SWen Congyang 67208ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_DONE || 67308ddb4ebSLukas Straub s->stage == BLOCK_REPLICATION_FAILOVER) { 67408ddb4ebSLukas Straub /* 67508ddb4ebSLukas Straub * This case happens when a secondary was promoted to primary. 67608ddb4ebSLukas Straub * Ignore the request because the secondary side of replication 67708ddb4ebSLukas Straub * doesn't have to do anything anymore. 67808ddb4ebSLukas Straub */ 67908ddb4ebSLukas Straub aio_context_release(aio_context); 68008ddb4ebSLukas Straub return; 68108ddb4ebSLukas Straub } 68208ddb4ebSLukas Straub 6833c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_RUNNING) { 68429ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 68529ff7890SWen Congyang aio_context_release(aio_context); 68629ff7890SWen Congyang return; 68729ff7890SWen Congyang } 68829ff7890SWen Congyang 68929ff7890SWen Congyang switch (s->mode) { 69029ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 6913c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 69229ff7890SWen Congyang s->error = 0; 69329ff7890SWen Congyang break; 69429ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 69529ff7890SWen Congyang /* 69629ff7890SWen Congyang * This BDS will be closed, and the job should be completed 69729ff7890SWen Congyang * before the BDS is closed, because we will access hidden 69829ff7890SWen Congyang * disk, secondary disk in backup_job_completed(). 69929ff7890SWen Congyang */ 700cc19f177SVladimir Sementsov-Ogievskiy if (s->backup_job) { 701cc19f177SVladimir Sementsov-Ogievskiy job_cancel_sync(&s->backup_job->job); 70229ff7890SWen Congyang } 70329ff7890SWen Congyang 70429ff7890SWen Congyang if (!failover) { 70529ff7890SWen Congyang secondary_do_checkpoint(s, errp); 7063c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 70729ff7890SWen Congyang aio_context_release(aio_context); 70829ff7890SWen Congyang return; 70929ff7890SWen Congyang } 71029ff7890SWen Congyang 7113c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER; 712cc19f177SVladimir Sementsov-Ogievskiy s->commit_job = commit_active_start( 713cc19f177SVladimir Sementsov-Ogievskiy NULL, s->active_disk->bs, s->secondary_disk->bs, 714bb02b65cSKevin Wolf JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, 71578bbd910SFam Zheng NULL, replication_done, bs, true, errp); 71629ff7890SWen Congyang break; 71729ff7890SWen Congyang default: 71829ff7890SWen Congyang aio_context_release(aio_context); 71929ff7890SWen Congyang abort(); 72029ff7890SWen Congyang } 72129ff7890SWen Congyang aio_context_release(aio_context); 72229ff7890SWen Congyang } 72329ff7890SWen Congyang 7242654267cSMax Reitz static const char *const replication_strong_runtime_opts[] = { 7252654267cSMax Reitz REPLICATION_MODE, 7262654267cSMax Reitz REPLICATION_TOP_ID, 7272654267cSMax Reitz 7282654267cSMax Reitz NULL 7292654267cSMax Reitz }; 7302654267cSMax Reitz 731782b9d06SAlberto Garcia static BlockDriver bdrv_replication = { 73229ff7890SWen Congyang .format_name = "replication", 73329ff7890SWen Congyang .instance_size = sizeof(BDRVReplicationState), 73429ff7890SWen Congyang 73529ff7890SWen Congyang .bdrv_open = replication_open, 73629ff7890SWen Congyang .bdrv_close = replication_close, 73737a9051cSChanglong Xie .bdrv_child_perm = replication_child_perm, 73829ff7890SWen Congyang 73929ff7890SWen Congyang .bdrv_getlength = replication_getlength, 74029ff7890SWen Congyang .bdrv_co_readv = replication_co_readv, 74129ff7890SWen Congyang .bdrv_co_writev = replication_co_writev, 74229ff7890SWen Congyang 74329ff7890SWen Congyang .is_filter = true, 74429ff7890SWen Congyang 74529ff7890SWen Congyang .has_variable_length = true, 7462654267cSMax Reitz .strong_runtime_opts = replication_strong_runtime_opts, 74729ff7890SWen Congyang }; 74829ff7890SWen Congyang 74929ff7890SWen Congyang static void bdrv_replication_init(void) 75029ff7890SWen Congyang { 75129ff7890SWen Congyang bdrv_register(&bdrv_replication); 75229ff7890SWen Congyang } 75329ff7890SWen Congyang 75429ff7890SWen Congyang block_init(bdrv_replication_init); 755