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" 25*b0262955SPaolo Bonzini #include "block/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 QemuOpts *opts = NULL; 8929ff7890SWen Congyang const char *mode; 9029ff7890SWen Congyang const char *top_id; 9129ff7890SWen Congyang 92b3af2af4SMax Reitz bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, 93b3af2af4SMax Reitz BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, 944e4bf5c4SKevin Wolf false, errp); 954e4bf5c4SKevin Wolf if (!bs->file) { 964e4bf5c4SKevin Wolf return -EINVAL; 974e4bf5c4SKevin Wolf } 984e4bf5c4SKevin Wolf 9929ff7890SWen Congyang ret = -EINVAL; 10029ff7890SWen Congyang opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); 101a5f9b9dfSMarkus Armbruster if (!qemu_opts_absorb_qdict(opts, options, errp)) { 10229ff7890SWen Congyang goto fail; 10329ff7890SWen Congyang } 10429ff7890SWen Congyang 10529ff7890SWen Congyang mode = qemu_opt_get(opts, REPLICATION_MODE); 10629ff7890SWen Congyang if (!mode) { 107dcfe4805SMarkus Armbruster error_setg(errp, "Missing the option mode"); 10829ff7890SWen Congyang goto fail; 10929ff7890SWen Congyang } 11029ff7890SWen Congyang 11129ff7890SWen Congyang if (!strcmp(mode, "primary")) { 11229ff7890SWen Congyang s->mode = REPLICATION_MODE_PRIMARY; 113f4f2539bSChanglong Xie top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 114f4f2539bSChanglong Xie if (top_id) { 115dcfe4805SMarkus Armbruster error_setg(errp, 116dcfe4805SMarkus Armbruster "The primary side does not support option top-id"); 117f4f2539bSChanglong Xie goto fail; 118f4f2539bSChanglong Xie } 11929ff7890SWen Congyang } else if (!strcmp(mode, "secondary")) { 12029ff7890SWen Congyang s->mode = REPLICATION_MODE_SECONDARY; 12129ff7890SWen Congyang top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 12229ff7890SWen Congyang s->top_id = g_strdup(top_id); 12329ff7890SWen Congyang if (!s->top_id) { 124dcfe4805SMarkus Armbruster error_setg(errp, "Missing the option top-id"); 12529ff7890SWen Congyang goto fail; 12629ff7890SWen Congyang } 12729ff7890SWen Congyang } else { 128dcfe4805SMarkus Armbruster error_setg(errp, 12929ff7890SWen Congyang "The option mode's value should be primary or secondary"); 13029ff7890SWen Congyang goto fail; 13129ff7890SWen Congyang } 13229ff7890SWen Congyang 13329ff7890SWen Congyang s->rs = replication_new(bs, &replication_ops); 13429ff7890SWen Congyang 13529ff7890SWen Congyang ret = 0; 13629ff7890SWen Congyang 13729ff7890SWen Congyang fail: 13829ff7890SWen Congyang qemu_opts_del(opts); 13929ff7890SWen Congyang return ret; 14029ff7890SWen Congyang } 14129ff7890SWen Congyang 14229ff7890SWen Congyang static void replication_close(BlockDriverState *bs) 14329ff7890SWen Congyang { 14429ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 14508558e33SStefan Reiter Job *commit_job; 14629ff7890SWen Congyang 1473c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_RUNNING) { 14829ff7890SWen Congyang replication_stop(s->rs, false, NULL); 14929ff7890SWen Congyang } 1503c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_FAILOVER) { 15108558e33SStefan Reiter commit_job = &s->commit_job->job; 15208558e33SStefan Reiter assert(commit_job->aio_context == qemu_get_current_aio_context()); 15308558e33SStefan Reiter job_cancel_sync(commit_job); 15450ab0e09SPaolo Bonzini } 15529ff7890SWen Congyang 15629ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 15729ff7890SWen Congyang g_free(s->top_id); 15829ff7890SWen Congyang } 15929ff7890SWen Congyang 16029ff7890SWen Congyang replication_remove(s->rs); 16129ff7890SWen Congyang } 16229ff7890SWen Congyang 16337a9051cSChanglong Xie static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, 164bf8e925eSMax Reitz BdrvChildRole role, 165e0995dc3SKevin Wolf BlockReopenQueue *reopen_queue, 16637a9051cSChanglong Xie uint64_t perm, uint64_t shared, 16737a9051cSChanglong Xie uint64_t *nperm, uint64_t *nshared) 16837a9051cSChanglong Xie { 169611e0653SWang Guang *nperm = BLK_PERM_CONSISTENT_READ; 170611e0653SWang Guang if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { 171611e0653SWang Guang *nperm |= BLK_PERM_WRITE; 172611e0653SWang Guang } 17378ee6bd0SPhilippe Mathieu-Daudé *nshared = BLK_PERM_CONSISTENT_READ 17478ee6bd0SPhilippe Mathieu-Daudé | BLK_PERM_WRITE 17537a9051cSChanglong Xie | BLK_PERM_WRITE_UNCHANGED; 17637a9051cSChanglong Xie return; 17737a9051cSChanglong Xie } 17837a9051cSChanglong Xie 17929ff7890SWen Congyang static int64_t replication_getlength(BlockDriverState *bs) 18029ff7890SWen Congyang { 18129ff7890SWen Congyang return bdrv_getlength(bs->file->bs); 18229ff7890SWen Congyang } 18329ff7890SWen Congyang 18429ff7890SWen Congyang static int replication_get_io_status(BDRVReplicationState *s) 18529ff7890SWen Congyang { 1863c76c606SFam Zheng switch (s->stage) { 18729ff7890SWen Congyang case BLOCK_REPLICATION_NONE: 18829ff7890SWen Congyang return -EIO; 18929ff7890SWen Congyang case BLOCK_REPLICATION_RUNNING: 19029ff7890SWen Congyang return 0; 19129ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER: 19229ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 19329ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER_FAILED: 19429ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; 19529ff7890SWen Congyang case BLOCK_REPLICATION_DONE: 19629ff7890SWen Congyang /* 19729ff7890SWen Congyang * active commit job completes, and active disk and secondary_disk 19829ff7890SWen Congyang * is swapped, so we can operate bs->file directly 19929ff7890SWen Congyang */ 20029ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 20129ff7890SWen Congyang default: 20229ff7890SWen Congyang abort(); 20329ff7890SWen Congyang } 20429ff7890SWen Congyang } 20529ff7890SWen Congyang 20629ff7890SWen Congyang static int replication_return_value(BDRVReplicationState *s, int ret) 20729ff7890SWen Congyang { 20829ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 20929ff7890SWen Congyang return ret; 21029ff7890SWen Congyang } 21129ff7890SWen Congyang 21229ff7890SWen Congyang if (ret < 0) { 21329ff7890SWen Congyang s->error = ret; 21429ff7890SWen Congyang ret = 0; 21529ff7890SWen Congyang } 21629ff7890SWen Congyang 21729ff7890SWen Congyang return ret; 21829ff7890SWen Congyang } 21929ff7890SWen Congyang 22029ff7890SWen Congyang static coroutine_fn int replication_co_readv(BlockDriverState *bs, 22129ff7890SWen Congyang int64_t sector_num, 22229ff7890SWen Congyang int remaining_sectors, 22329ff7890SWen Congyang QEMUIOVector *qiov) 22429ff7890SWen Congyang { 22529ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 22629ff7890SWen Congyang int ret; 22729ff7890SWen Congyang 22829ff7890SWen Congyang if (s->mode == REPLICATION_MODE_PRIMARY) { 22929ff7890SWen Congyang /* We only use it to forward primary write requests */ 23029ff7890SWen Congyang return -EIO; 23129ff7890SWen Congyang } 23229ff7890SWen Congyang 23329ff7890SWen Congyang ret = replication_get_io_status(s); 23429ff7890SWen Congyang if (ret < 0) { 23529ff7890SWen Congyang return ret; 23629ff7890SWen Congyang } 23729ff7890SWen Congyang 23804a11d87SEric Blake ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, 23904a11d87SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 240e4f9752cSVladimir Sementsov-Ogievskiy 24129ff7890SWen Congyang return replication_return_value(s, ret); 24229ff7890SWen Congyang } 24329ff7890SWen Congyang 24429ff7890SWen Congyang static coroutine_fn int replication_co_writev(BlockDriverState *bs, 24529ff7890SWen Congyang int64_t sector_num, 24629ff7890SWen Congyang int remaining_sectors, 247e18a58b4SEric Blake QEMUIOVector *qiov, 248e18a58b4SEric Blake int flags) 24929ff7890SWen Congyang { 25029ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 25129ff7890SWen Congyang QEMUIOVector hd_qiov; 25229ff7890SWen Congyang uint64_t bytes_done = 0; 25329ff7890SWen Congyang BdrvChild *top = bs->file; 25429ff7890SWen Congyang BdrvChild *base = s->secondary_disk; 25529ff7890SWen Congyang BdrvChild *target; 25651b0a488SEric Blake int ret; 25751b0a488SEric Blake int64_t n; 25829ff7890SWen Congyang 259e18a58b4SEric Blake assert(!flags); 26029ff7890SWen Congyang ret = replication_get_io_status(s); 26129ff7890SWen Congyang if (ret < 0) { 26229ff7890SWen Congyang goto out; 26329ff7890SWen Congyang } 26429ff7890SWen Congyang 26529ff7890SWen Congyang if (ret == 0) { 26604a11d87SEric Blake ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, 26704a11d87SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 26829ff7890SWen Congyang return replication_return_value(s, ret); 26929ff7890SWen Congyang } 27029ff7890SWen Congyang 27129ff7890SWen Congyang /* 27229ff7890SWen Congyang * Failover failed, only write to active disk if the sectors 27329ff7890SWen Congyang * have already been allocated in active disk/hidden disk. 27429ff7890SWen Congyang */ 27529ff7890SWen Congyang qemu_iovec_init(&hd_qiov, qiov->niov); 27629ff7890SWen Congyang while (remaining_sectors > 0) { 27751b0a488SEric Blake int64_t count; 27851b0a488SEric Blake 279170d3bd3SAndrey Shinkevich ret = bdrv_is_allocated_above(top->bs, base->bs, false, 28051b0a488SEric Blake sector_num * BDRV_SECTOR_SIZE, 28151b0a488SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, 28251b0a488SEric Blake &count); 28329ff7890SWen Congyang if (ret < 0) { 28429ff7890SWen Congyang goto out1; 28529ff7890SWen Congyang } 28629ff7890SWen Congyang 28751b0a488SEric Blake assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); 28851b0a488SEric Blake n = count >> BDRV_SECTOR_BITS; 28929ff7890SWen Congyang qemu_iovec_reset(&hd_qiov); 29051b0a488SEric Blake qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); 29129ff7890SWen Congyang 29229ff7890SWen Congyang target = ret ? top : base; 29304a11d87SEric Blake ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, 29404a11d87SEric Blake n * BDRV_SECTOR_SIZE, &hd_qiov, 0); 29529ff7890SWen Congyang if (ret < 0) { 29629ff7890SWen Congyang goto out1; 29729ff7890SWen Congyang } 29829ff7890SWen Congyang 29929ff7890SWen Congyang remaining_sectors -= n; 30029ff7890SWen Congyang sector_num += n; 30151b0a488SEric Blake bytes_done += count; 30229ff7890SWen Congyang } 30329ff7890SWen Congyang 30429ff7890SWen Congyang out1: 30529ff7890SWen Congyang qemu_iovec_destroy(&hd_qiov); 30629ff7890SWen Congyang out: 30729ff7890SWen Congyang return ret; 30829ff7890SWen Congyang } 30929ff7890SWen Congyang 31029ff7890SWen Congyang static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) 31129ff7890SWen Congyang { 31229ff7890SWen Congyang Error *local_err = NULL; 31329ff7890SWen Congyang int ret; 31429ff7890SWen Congyang 315cc19f177SVladimir Sementsov-Ogievskiy if (!s->backup_job) { 31629ff7890SWen Congyang error_setg(errp, "Backup job was cancelled unexpectedly"); 31729ff7890SWen Congyang return; 31829ff7890SWen Congyang } 31929ff7890SWen Congyang 320cc19f177SVladimir Sementsov-Ogievskiy backup_do_checkpoint(s->backup_job, &local_err); 32129ff7890SWen Congyang if (local_err) { 32229ff7890SWen Congyang error_propagate(errp, local_err); 32329ff7890SWen Congyang return; 32429ff7890SWen Congyang } 32529ff7890SWen Congyang 326d470ad42SMax Reitz if (!s->active_disk->bs->drv) { 327d470ad42SMax Reitz error_setg(errp, "Active disk %s is ejected", 328d470ad42SMax Reitz s->active_disk->bs->node_name); 329d470ad42SMax Reitz return; 330d470ad42SMax Reitz } 331d470ad42SMax Reitz 332f844ec01SMax Reitz ret = bdrv_make_empty(s->active_disk, errp); 33329ff7890SWen Congyang if (ret < 0) { 33429ff7890SWen Congyang return; 33529ff7890SWen Congyang } 33629ff7890SWen Congyang 337d470ad42SMax Reitz if (!s->hidden_disk->bs->drv) { 338d470ad42SMax Reitz error_setg(errp, "Hidden disk %s is ejected", 339d470ad42SMax Reitz s->hidden_disk->bs->node_name); 340d470ad42SMax Reitz return; 341d470ad42SMax Reitz } 342d470ad42SMax Reitz 3436ecbc6c5SKevin Wolf BlockBackend *blk = blk_new(qemu_get_current_aio_context(), 3446ecbc6c5SKevin Wolf BLK_PERM_WRITE, BLK_PERM_ALL); 3456ecbc6c5SKevin Wolf blk_insert_bs(blk, s->hidden_disk->bs, &local_err); 3466ecbc6c5SKevin Wolf if (local_err) { 3476ecbc6c5SKevin Wolf error_propagate(errp, local_err); 3486ecbc6c5SKevin Wolf blk_unref(blk); 3496ecbc6c5SKevin Wolf return; 3506ecbc6c5SKevin Wolf } 3516ecbc6c5SKevin Wolf 3526ecbc6c5SKevin Wolf ret = blk_make_empty(blk, errp); 3536ecbc6c5SKevin Wolf blk_unref(blk); 35429ff7890SWen Congyang if (ret < 0) { 35529ff7890SWen Congyang return; 35629ff7890SWen Congyang } 35729ff7890SWen Congyang } 35829ff7890SWen Congyang 3593c4e9647SAlberto Garcia /* This function is supposed to be called twice: 3603c4e9647SAlberto Garcia * first with writable = true, then with writable = false. 3613c4e9647SAlberto Garcia * The first call puts s->hidden_disk and s->secondary_disk in 3623c4e9647SAlberto Garcia * r/w mode, and the second puts them back in their original state. 3633c4e9647SAlberto Garcia */ 3648dd9006eSPaolo Bonzini static void reopen_backing_file(BlockDriverState *bs, bool writable, 36529ff7890SWen Congyang Error **errp) 36629ff7890SWen Congyang { 3678dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 36829ff7890SWen Congyang BlockReopenQueue *reopen_queue = NULL; 36929ff7890SWen Congyang 37029ff7890SWen Congyang if (writable) { 3713c4e9647SAlberto Garcia s->orig_hidden_read_only = bdrv_is_read_only(s->hidden_disk->bs); 3723c4e9647SAlberto Garcia s->orig_secondary_read_only = bdrv_is_read_only(s->secondary_disk->bs); 37329ff7890SWen Congyang } 37429ff7890SWen Congyang 3751a63a907SKevin Wolf bdrv_subtree_drained_begin(s->hidden_disk->bs); 3761a63a907SKevin Wolf bdrv_subtree_drained_begin(s->secondary_disk->bs); 3771a63a907SKevin Wolf 3783c4e9647SAlberto Garcia if (s->orig_hidden_read_only) { 3793c4e9647SAlberto Garcia QDict *opts = qdict_new(); 3803c4e9647SAlberto Garcia qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 3813c4e9647SAlberto Garcia reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, 382077e8e20SAlberto Garcia opts, true); 38329ff7890SWen Congyang } 38429ff7890SWen Congyang 3853c4e9647SAlberto Garcia if (s->orig_secondary_read_only) { 3863c4e9647SAlberto Garcia QDict *opts = qdict_new(); 3873c4e9647SAlberto Garcia qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 38829ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, 389077e8e20SAlberto Garcia opts, true); 39029ff7890SWen Congyang } 39129ff7890SWen Congyang 39229ff7890SWen Congyang if (reopen_queue) { 393992861fbSMarkus Armbruster bdrv_reopen_multiple(reopen_queue, errp); 39429ff7890SWen Congyang } 3951a63a907SKevin Wolf 3961a63a907SKevin Wolf bdrv_subtree_drained_end(s->hidden_disk->bs); 3971a63a907SKevin Wolf bdrv_subtree_drained_end(s->secondary_disk->bs); 39829ff7890SWen Congyang } 39929ff7890SWen Congyang 4008dd9006eSPaolo Bonzini static void backup_job_cleanup(BlockDriverState *bs) 40129ff7890SWen Congyang { 4028dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 40329ff7890SWen Congyang BlockDriverState *top_bs; 40429ff7890SWen Congyang 405e140f4b7SLukas Straub s->backup_job = NULL; 406e140f4b7SLukas Straub 40729ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 40829ff7890SWen Congyang if (!top_bs) { 40929ff7890SWen Congyang return; 41029ff7890SWen Congyang } 41129ff7890SWen Congyang bdrv_op_unblock_all(top_bs, s->blocker); 41229ff7890SWen Congyang error_free(s->blocker); 4138dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 41429ff7890SWen Congyang } 41529ff7890SWen Congyang 41629ff7890SWen Congyang static void backup_job_completed(void *opaque, int ret) 41729ff7890SWen Congyang { 4188dd9006eSPaolo Bonzini BlockDriverState *bs = opaque; 4198dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 42029ff7890SWen Congyang 4213c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_FAILOVER) { 42229ff7890SWen Congyang /* The backup job is cancelled unexpectedly */ 42329ff7890SWen Congyang s->error = -EIO; 42429ff7890SWen Congyang } 42529ff7890SWen Congyang 4268dd9006eSPaolo Bonzini backup_job_cleanup(bs); 42729ff7890SWen Congyang } 42829ff7890SWen Congyang 42929ff7890SWen Congyang static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) 43029ff7890SWen Congyang { 43129ff7890SWen Congyang BdrvChild *child; 43229ff7890SWen Congyang 43329ff7890SWen Congyang /* The bs itself is the top_bs */ 43429ff7890SWen Congyang if (top_bs == bs) { 43529ff7890SWen Congyang return true; 43629ff7890SWen Congyang } 43729ff7890SWen Congyang 43829ff7890SWen Congyang /* Iterate over top_bs's children */ 43929ff7890SWen Congyang QLIST_FOREACH(child, &top_bs->children, next) { 44029ff7890SWen Congyang if (child->bs == bs || check_top_bs(child->bs, bs)) { 44129ff7890SWen Congyang return true; 44229ff7890SWen Congyang } 44329ff7890SWen Congyang } 44429ff7890SWen Congyang 44529ff7890SWen Congyang return false; 44629ff7890SWen Congyang } 44729ff7890SWen Congyang 44829ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 44929ff7890SWen Congyang Error **errp) 45029ff7890SWen Congyang { 45129ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 45229ff7890SWen Congyang BDRVReplicationState *s; 45329ff7890SWen Congyang BlockDriverState *top_bs; 45429ff7890SWen Congyang int64_t active_length, hidden_length, disk_length; 45529ff7890SWen Congyang AioContext *aio_context; 45629ff7890SWen Congyang Error *local_err = NULL; 4572c59fd83SVladimir Sementsov-Ogievskiy BackupPerf perf = { .use_copy_range = true, .max_workers = 1 }; 45829ff7890SWen Congyang 45929ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 46029ff7890SWen Congyang aio_context_acquire(aio_context); 46129ff7890SWen Congyang s = bs->opaque; 46229ff7890SWen Congyang 46308ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_DONE || 46408ddb4ebSLukas Straub s->stage == BLOCK_REPLICATION_FAILOVER) { 46508ddb4ebSLukas Straub /* 46608ddb4ebSLukas Straub * This case happens when a secondary is promoted to primary. 46708ddb4ebSLukas Straub * Ignore the request because the secondary side of replication 46808ddb4ebSLukas Straub * doesn't have to do anything anymore. 46908ddb4ebSLukas Straub */ 47008ddb4ebSLukas Straub aio_context_release(aio_context); 47108ddb4ebSLukas Straub return; 47208ddb4ebSLukas Straub } 47308ddb4ebSLukas Straub 4743c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_NONE) { 47529ff7890SWen Congyang error_setg(errp, "Block replication is running or done"); 47629ff7890SWen Congyang aio_context_release(aio_context); 47729ff7890SWen Congyang return; 47829ff7890SWen Congyang } 47929ff7890SWen Congyang 48029ff7890SWen Congyang if (s->mode != mode) { 48129ff7890SWen Congyang error_setg(errp, "The parameter mode's value is invalid, needs %d," 48229ff7890SWen Congyang " but got %d", s->mode, mode); 48329ff7890SWen Congyang aio_context_release(aio_context); 48429ff7890SWen Congyang return; 48529ff7890SWen Congyang } 48629ff7890SWen Congyang 48729ff7890SWen Congyang switch (s->mode) { 48829ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 48929ff7890SWen Congyang break; 49029ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 49129ff7890SWen Congyang s->active_disk = bs->file; 49229ff7890SWen Congyang if (!s->active_disk || !s->active_disk->bs || 49329ff7890SWen Congyang !s->active_disk->bs->backing) { 49429ff7890SWen Congyang error_setg(errp, "Active disk doesn't have backing file"); 49529ff7890SWen Congyang aio_context_release(aio_context); 49629ff7890SWen Congyang return; 49729ff7890SWen Congyang } 49829ff7890SWen Congyang 49929ff7890SWen Congyang s->hidden_disk = s->active_disk->bs->backing; 50029ff7890SWen Congyang if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { 50129ff7890SWen Congyang error_setg(errp, "Hidden disk doesn't have backing file"); 50229ff7890SWen Congyang aio_context_release(aio_context); 50329ff7890SWen Congyang return; 50429ff7890SWen Congyang } 50529ff7890SWen Congyang 50629ff7890SWen Congyang s->secondary_disk = s->hidden_disk->bs->backing; 50729ff7890SWen Congyang if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { 50829ff7890SWen Congyang error_setg(errp, "The secondary disk doesn't have block backend"); 50929ff7890SWen Congyang aio_context_release(aio_context); 51029ff7890SWen Congyang return; 51129ff7890SWen Congyang } 51229ff7890SWen Congyang 51329ff7890SWen Congyang /* verify the length */ 51429ff7890SWen Congyang active_length = bdrv_getlength(s->active_disk->bs); 51529ff7890SWen Congyang hidden_length = bdrv_getlength(s->hidden_disk->bs); 51629ff7890SWen Congyang disk_length = bdrv_getlength(s->secondary_disk->bs); 51729ff7890SWen Congyang if (active_length < 0 || hidden_length < 0 || disk_length < 0 || 51829ff7890SWen Congyang active_length != hidden_length || hidden_length != disk_length) { 51929ff7890SWen Congyang error_setg(errp, "Active disk, hidden disk, secondary disk's length" 52029ff7890SWen Congyang " are not the same"); 52129ff7890SWen Congyang aio_context_release(aio_context); 52229ff7890SWen Congyang return; 52329ff7890SWen Congyang } 52429ff7890SWen Congyang 525d470ad42SMax Reitz /* Must be true, or the bdrv_getlength() calls would have failed */ 526d470ad42SMax Reitz assert(s->active_disk->bs->drv && s->hidden_disk->bs->drv); 527d470ad42SMax Reitz 52829ff7890SWen Congyang if (!s->active_disk->bs->drv->bdrv_make_empty || 52929ff7890SWen Congyang !s->hidden_disk->bs->drv->bdrv_make_empty) { 53029ff7890SWen Congyang error_setg(errp, 53129ff7890SWen Congyang "Active disk or hidden disk doesn't support make_empty"); 53229ff7890SWen Congyang aio_context_release(aio_context); 53329ff7890SWen Congyang return; 53429ff7890SWen Congyang } 53529ff7890SWen Congyang 53629ff7890SWen Congyang /* reopen the backing file in r/w mode */ 5378dd9006eSPaolo Bonzini reopen_backing_file(bs, true, &local_err); 53829ff7890SWen Congyang if (local_err) { 53929ff7890SWen Congyang error_propagate(errp, local_err); 54029ff7890SWen Congyang aio_context_release(aio_context); 54129ff7890SWen Congyang return; 54229ff7890SWen Congyang } 54329ff7890SWen Congyang 54429ff7890SWen Congyang /* start backup job now */ 54529ff7890SWen Congyang error_setg(&s->blocker, 54629ff7890SWen Congyang "Block device is in use by internal backup job"); 54729ff7890SWen Congyang 54829ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 54929ff7890SWen Congyang if (!top_bs || !bdrv_is_root_node(top_bs) || 55029ff7890SWen Congyang !check_top_bs(top_bs, bs)) { 55129ff7890SWen Congyang error_setg(errp, "No top_bs or it is invalid"); 5528dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 55329ff7890SWen Congyang aio_context_release(aio_context); 55429ff7890SWen Congyang return; 55529ff7890SWen Congyang } 55629ff7890SWen Congyang bdrv_op_block_all(top_bs, s->blocker); 55729ff7890SWen Congyang bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); 55829ff7890SWen Congyang 559cc19f177SVladimir Sementsov-Ogievskiy s->backup_job = backup_job_create( 560cc19f177SVladimir Sementsov-Ogievskiy NULL, s->secondary_disk->bs, s->hidden_disk->bs, 56100e30f05SVladimir Sementsov-Ogievskiy 0, MIRROR_SYNC_MODE_NONE, NULL, 0, false, NULL, 56286c6a3b6SVladimir Sementsov-Ogievskiy &perf, 563111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, 564bb02b65cSKevin Wolf BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, 565111049a4SJohn Snow backup_job_completed, bs, NULL, &local_err); 56629ff7890SWen Congyang if (local_err) { 56729ff7890SWen Congyang error_propagate(errp, local_err); 5688dd9006eSPaolo Bonzini backup_job_cleanup(bs); 56929ff7890SWen Congyang aio_context_release(aio_context); 57029ff7890SWen Congyang return; 57129ff7890SWen Congyang } 572cc19f177SVladimir Sementsov-Ogievskiy job_start(&s->backup_job->job); 57329ff7890SWen Congyang break; 57429ff7890SWen Congyang default: 57529ff7890SWen Congyang aio_context_release(aio_context); 57629ff7890SWen Congyang abort(); 57729ff7890SWen Congyang } 57829ff7890SWen Congyang 5793c76c606SFam Zheng s->stage = BLOCK_REPLICATION_RUNNING; 58029ff7890SWen Congyang 58129ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 58229ff7890SWen Congyang secondary_do_checkpoint(s, errp); 58329ff7890SWen Congyang } 58429ff7890SWen Congyang 58529ff7890SWen Congyang s->error = 0; 58629ff7890SWen Congyang aio_context_release(aio_context); 58729ff7890SWen Congyang } 58829ff7890SWen Congyang 58929ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp) 59029ff7890SWen Congyang { 59129ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 59229ff7890SWen Congyang BDRVReplicationState *s; 59329ff7890SWen Congyang AioContext *aio_context; 59429ff7890SWen Congyang 59529ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 59629ff7890SWen Congyang aio_context_acquire(aio_context); 59729ff7890SWen Congyang s = bs->opaque; 59829ff7890SWen Congyang 59908ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_DONE || 60008ddb4ebSLukas Straub s->stage == BLOCK_REPLICATION_FAILOVER) { 60108ddb4ebSLukas Straub /* 60208ddb4ebSLukas Straub * This case happens when a secondary was promoted to primary. 60308ddb4ebSLukas Straub * Ignore the request because the secondary side of replication 60408ddb4ebSLukas Straub * doesn't have to do anything anymore. 60508ddb4ebSLukas Straub */ 60608ddb4ebSLukas Straub aio_context_release(aio_context); 60708ddb4ebSLukas Straub return; 60808ddb4ebSLukas Straub } 60908ddb4ebSLukas Straub 61029ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 61129ff7890SWen Congyang secondary_do_checkpoint(s, errp); 61229ff7890SWen Congyang } 61329ff7890SWen Congyang aio_context_release(aio_context); 61429ff7890SWen Congyang } 61529ff7890SWen Congyang 61629ff7890SWen Congyang static void replication_get_error(ReplicationState *rs, Error **errp) 61729ff7890SWen Congyang { 61829ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 61929ff7890SWen Congyang BDRVReplicationState *s; 62029ff7890SWen Congyang AioContext *aio_context; 62129ff7890SWen Congyang 62229ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 62329ff7890SWen Congyang aio_context_acquire(aio_context); 62429ff7890SWen Congyang s = bs->opaque; 62529ff7890SWen Congyang 62608ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_NONE) { 62729ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 62829ff7890SWen Congyang aio_context_release(aio_context); 62929ff7890SWen Congyang return; 63029ff7890SWen Congyang } 63129ff7890SWen Congyang 63229ff7890SWen Congyang if (s->error) { 63329ff7890SWen Congyang error_setg(errp, "I/O error occurred"); 63429ff7890SWen Congyang aio_context_release(aio_context); 63529ff7890SWen Congyang return; 63629ff7890SWen Congyang } 63729ff7890SWen Congyang aio_context_release(aio_context); 63829ff7890SWen Congyang } 63929ff7890SWen Congyang 64029ff7890SWen Congyang static void replication_done(void *opaque, int ret) 64129ff7890SWen Congyang { 64229ff7890SWen Congyang BlockDriverState *bs = opaque; 64329ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 64429ff7890SWen Congyang 64529ff7890SWen Congyang if (ret == 0) { 6463c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 64729ff7890SWen Congyang 64829ff7890SWen Congyang s->active_disk = NULL; 64929ff7890SWen Congyang s->secondary_disk = NULL; 65029ff7890SWen Congyang s->hidden_disk = NULL; 65129ff7890SWen Congyang s->error = 0; 65229ff7890SWen Congyang } else { 6533c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; 65429ff7890SWen Congyang s->error = -EIO; 65529ff7890SWen Congyang } 65629ff7890SWen Congyang } 65729ff7890SWen Congyang 65829ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, Error **errp) 65929ff7890SWen Congyang { 66029ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 66129ff7890SWen Congyang BDRVReplicationState *s; 66229ff7890SWen Congyang AioContext *aio_context; 66329ff7890SWen Congyang 66429ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 66529ff7890SWen Congyang aio_context_acquire(aio_context); 66629ff7890SWen Congyang s = bs->opaque; 66729ff7890SWen Congyang 66808ddb4ebSLukas Straub if (s->stage == BLOCK_REPLICATION_DONE || 66908ddb4ebSLukas Straub s->stage == BLOCK_REPLICATION_FAILOVER) { 67008ddb4ebSLukas Straub /* 67108ddb4ebSLukas Straub * This case happens when a secondary was promoted to primary. 67208ddb4ebSLukas Straub * Ignore the request because the secondary side of replication 67308ddb4ebSLukas Straub * doesn't have to do anything anymore. 67408ddb4ebSLukas Straub */ 67508ddb4ebSLukas Straub aio_context_release(aio_context); 67608ddb4ebSLukas Straub return; 67708ddb4ebSLukas Straub } 67808ddb4ebSLukas Straub 6793c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_RUNNING) { 68029ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 68129ff7890SWen Congyang aio_context_release(aio_context); 68229ff7890SWen Congyang return; 68329ff7890SWen Congyang } 68429ff7890SWen Congyang 68529ff7890SWen Congyang switch (s->mode) { 68629ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 6873c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 68829ff7890SWen Congyang s->error = 0; 68929ff7890SWen Congyang break; 69029ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 69129ff7890SWen Congyang /* 69229ff7890SWen Congyang * This BDS will be closed, and the job should be completed 69329ff7890SWen Congyang * before the BDS is closed, because we will access hidden 69429ff7890SWen Congyang * disk, secondary disk in backup_job_completed(). 69529ff7890SWen Congyang */ 696cc19f177SVladimir Sementsov-Ogievskiy if (s->backup_job) { 697cc19f177SVladimir Sementsov-Ogievskiy job_cancel_sync(&s->backup_job->job); 69829ff7890SWen Congyang } 69929ff7890SWen Congyang 70029ff7890SWen Congyang if (!failover) { 70129ff7890SWen Congyang secondary_do_checkpoint(s, errp); 7023c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 70329ff7890SWen Congyang aio_context_release(aio_context); 70429ff7890SWen Congyang return; 70529ff7890SWen Congyang } 70629ff7890SWen Congyang 7073c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER; 708cc19f177SVladimir Sementsov-Ogievskiy s->commit_job = commit_active_start( 709cc19f177SVladimir Sementsov-Ogievskiy NULL, s->active_disk->bs, s->secondary_disk->bs, 710bb02b65cSKevin Wolf JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, 71178bbd910SFam Zheng NULL, replication_done, bs, true, errp); 71229ff7890SWen Congyang break; 71329ff7890SWen Congyang default: 71429ff7890SWen Congyang aio_context_release(aio_context); 71529ff7890SWen Congyang abort(); 71629ff7890SWen Congyang } 71729ff7890SWen Congyang aio_context_release(aio_context); 71829ff7890SWen Congyang } 71929ff7890SWen Congyang 7202654267cSMax Reitz static const char *const replication_strong_runtime_opts[] = { 7212654267cSMax Reitz REPLICATION_MODE, 7222654267cSMax Reitz REPLICATION_TOP_ID, 7232654267cSMax Reitz 7242654267cSMax Reitz NULL 7252654267cSMax Reitz }; 7262654267cSMax Reitz 727782b9d06SAlberto Garcia static BlockDriver bdrv_replication = { 72829ff7890SWen Congyang .format_name = "replication", 72929ff7890SWen Congyang .instance_size = sizeof(BDRVReplicationState), 73029ff7890SWen Congyang 73129ff7890SWen Congyang .bdrv_open = replication_open, 73229ff7890SWen Congyang .bdrv_close = replication_close, 73337a9051cSChanglong Xie .bdrv_child_perm = replication_child_perm, 73429ff7890SWen Congyang 73529ff7890SWen Congyang .bdrv_getlength = replication_getlength, 73629ff7890SWen Congyang .bdrv_co_readv = replication_co_readv, 73729ff7890SWen Congyang .bdrv_co_writev = replication_co_writev, 73829ff7890SWen Congyang 73929ff7890SWen Congyang .is_filter = true, 74029ff7890SWen Congyang 74129ff7890SWen Congyang .has_variable_length = true, 7422654267cSMax Reitz .strong_runtime_opts = replication_strong_runtime_opts, 74329ff7890SWen Congyang }; 74429ff7890SWen Congyang 74529ff7890SWen Congyang static void bdrv_replication_init(void) 74629ff7890SWen Congyang { 74729ff7890SWen Congyang bdrv_register(&bdrv_replication); 74829ff7890SWen Congyang } 74929ff7890SWen Congyang 75029ff7890SWen Congyang block_init(bdrv_replication_init); 751