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; 39*cc19f177SVladimir Sementsov-Ogievskiy BlockJob *commit_job; 4029ff7890SWen Congyang BdrvChild *hidden_disk; 4129ff7890SWen Congyang BdrvChild *secondary_disk; 42*cc19f177SVladimir 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 934e4bf5c4SKevin Wolf bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 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); 10129ff7890SWen Congyang qemu_opts_absorb_qdict(opts, options, &local_err); 10229ff7890SWen Congyang if (local_err) { 10329ff7890SWen Congyang goto fail; 10429ff7890SWen Congyang } 10529ff7890SWen Congyang 10629ff7890SWen Congyang mode = qemu_opt_get(opts, REPLICATION_MODE); 10729ff7890SWen Congyang if (!mode) { 10829ff7890SWen Congyang error_setg(&local_err, "Missing the option mode"); 10929ff7890SWen Congyang goto fail; 11029ff7890SWen Congyang } 11129ff7890SWen Congyang 11229ff7890SWen Congyang if (!strcmp(mode, "primary")) { 11329ff7890SWen Congyang s->mode = REPLICATION_MODE_PRIMARY; 114f4f2539bSChanglong Xie top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); 115f4f2539bSChanglong Xie if (top_id) { 116f4f2539bSChanglong Xie error_setg(&local_err, "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) { 12429ff7890SWen Congyang error_setg(&local_err, "Missing the option top-id"); 12529ff7890SWen Congyang goto fail; 12629ff7890SWen Congyang } 12729ff7890SWen Congyang } else { 12829ff7890SWen Congyang error_setg(&local_err, 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 error_propagate(errp, local_err); 14029ff7890SWen Congyang 14129ff7890SWen Congyang return ret; 14229ff7890SWen Congyang } 14329ff7890SWen Congyang 14429ff7890SWen Congyang static void replication_close(BlockDriverState *bs) 14529ff7890SWen Congyang { 14629ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 14729ff7890SWen Congyang 1483c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_RUNNING) { 14929ff7890SWen Congyang replication_stop(s->rs, false, NULL); 15029ff7890SWen Congyang } 1513c76c606SFam Zheng if (s->stage == BLOCK_REPLICATION_FAILOVER) { 152*cc19f177SVladimir Sementsov-Ogievskiy job_cancel_sync(&s->commit_job->job); 15350ab0e09SPaolo Bonzini } 15429ff7890SWen Congyang 15529ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 15629ff7890SWen Congyang g_free(s->top_id); 15729ff7890SWen Congyang } 15829ff7890SWen Congyang 15929ff7890SWen Congyang replication_remove(s->rs); 16029ff7890SWen Congyang } 16129ff7890SWen Congyang 16237a9051cSChanglong Xie static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, 16337a9051cSChanglong Xie const BdrvChildRole *role, 164e0995dc3SKevin Wolf BlockReopenQueue *reopen_queue, 16537a9051cSChanglong Xie uint64_t perm, uint64_t shared, 16637a9051cSChanglong Xie uint64_t *nperm, uint64_t *nshared) 16737a9051cSChanglong Xie { 168611e0653SWang Guang *nperm = BLK_PERM_CONSISTENT_READ; 169611e0653SWang Guang if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { 170611e0653SWang Guang *nperm |= BLK_PERM_WRITE; 171611e0653SWang Guang } 172611e0653SWang Guang *nshared = BLK_PERM_CONSISTENT_READ \ 17337a9051cSChanglong Xie | BLK_PERM_WRITE \ 17437a9051cSChanglong Xie | BLK_PERM_WRITE_UNCHANGED; 17537a9051cSChanglong Xie return; 17637a9051cSChanglong Xie } 17737a9051cSChanglong Xie 17829ff7890SWen Congyang static int64_t replication_getlength(BlockDriverState *bs) 17929ff7890SWen Congyang { 18029ff7890SWen Congyang return bdrv_getlength(bs->file->bs); 18129ff7890SWen Congyang } 18229ff7890SWen Congyang 18329ff7890SWen Congyang static int replication_get_io_status(BDRVReplicationState *s) 18429ff7890SWen Congyang { 1853c76c606SFam Zheng switch (s->stage) { 18629ff7890SWen Congyang case BLOCK_REPLICATION_NONE: 18729ff7890SWen Congyang return -EIO; 18829ff7890SWen Congyang case BLOCK_REPLICATION_RUNNING: 18929ff7890SWen Congyang return 0; 19029ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER: 19129ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 19229ff7890SWen Congyang case BLOCK_REPLICATION_FAILOVER_FAILED: 19329ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; 19429ff7890SWen Congyang case BLOCK_REPLICATION_DONE: 19529ff7890SWen Congyang /* 19629ff7890SWen Congyang * active commit job completes, and active disk and secondary_disk 19729ff7890SWen Congyang * is swapped, so we can operate bs->file directly 19829ff7890SWen Congyang */ 19929ff7890SWen Congyang return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; 20029ff7890SWen Congyang default: 20129ff7890SWen Congyang abort(); 20229ff7890SWen Congyang } 20329ff7890SWen Congyang } 20429ff7890SWen Congyang 20529ff7890SWen Congyang static int replication_return_value(BDRVReplicationState *s, int ret) 20629ff7890SWen Congyang { 20729ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 20829ff7890SWen Congyang return ret; 20929ff7890SWen Congyang } 21029ff7890SWen Congyang 21129ff7890SWen Congyang if (ret < 0) { 21229ff7890SWen Congyang s->error = ret; 21329ff7890SWen Congyang ret = 0; 21429ff7890SWen Congyang } 21529ff7890SWen Congyang 21629ff7890SWen Congyang return ret; 21729ff7890SWen Congyang } 21829ff7890SWen Congyang 21929ff7890SWen Congyang static coroutine_fn int replication_co_readv(BlockDriverState *bs, 22029ff7890SWen Congyang int64_t sector_num, 22129ff7890SWen Congyang int remaining_sectors, 22229ff7890SWen Congyang QEMUIOVector *qiov) 22329ff7890SWen Congyang { 22429ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 22529ff7890SWen Congyang int ret; 22629ff7890SWen Congyang 22729ff7890SWen Congyang if (s->mode == REPLICATION_MODE_PRIMARY) { 22829ff7890SWen Congyang /* We only use it to forward primary write requests */ 22929ff7890SWen Congyang return -EIO; 23029ff7890SWen Congyang } 23129ff7890SWen Congyang 23229ff7890SWen Congyang ret = replication_get_io_status(s); 23329ff7890SWen Congyang if (ret < 0) { 23429ff7890SWen Congyang return ret; 23529ff7890SWen Congyang } 23629ff7890SWen Congyang 23704a11d87SEric Blake ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, 23804a11d87SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 239e4f9752cSVladimir Sementsov-Ogievskiy 24029ff7890SWen Congyang return replication_return_value(s, ret); 24129ff7890SWen Congyang } 24229ff7890SWen Congyang 24329ff7890SWen Congyang static coroutine_fn int replication_co_writev(BlockDriverState *bs, 24429ff7890SWen Congyang int64_t sector_num, 24529ff7890SWen Congyang int remaining_sectors, 246e18a58b4SEric Blake QEMUIOVector *qiov, 247e18a58b4SEric Blake int flags) 24829ff7890SWen Congyang { 24929ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 25029ff7890SWen Congyang QEMUIOVector hd_qiov; 25129ff7890SWen Congyang uint64_t bytes_done = 0; 25229ff7890SWen Congyang BdrvChild *top = bs->file; 25329ff7890SWen Congyang BdrvChild *base = s->secondary_disk; 25429ff7890SWen Congyang BdrvChild *target; 25551b0a488SEric Blake int ret; 25651b0a488SEric Blake int64_t n; 25729ff7890SWen Congyang 258e18a58b4SEric Blake assert(!flags); 25929ff7890SWen Congyang ret = replication_get_io_status(s); 26029ff7890SWen Congyang if (ret < 0) { 26129ff7890SWen Congyang goto out; 26229ff7890SWen Congyang } 26329ff7890SWen Congyang 26429ff7890SWen Congyang if (ret == 0) { 26504a11d87SEric Blake ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, 26604a11d87SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); 26729ff7890SWen Congyang return replication_return_value(s, ret); 26829ff7890SWen Congyang } 26929ff7890SWen Congyang 27029ff7890SWen Congyang /* 27129ff7890SWen Congyang * Failover failed, only write to active disk if the sectors 27229ff7890SWen Congyang * have already been allocated in active disk/hidden disk. 27329ff7890SWen Congyang */ 27429ff7890SWen Congyang qemu_iovec_init(&hd_qiov, qiov->niov); 27529ff7890SWen Congyang while (remaining_sectors > 0) { 27651b0a488SEric Blake int64_t count; 27751b0a488SEric Blake 27851b0a488SEric Blake ret = bdrv_is_allocated_above(top->bs, base->bs, 27951b0a488SEric Blake sector_num * BDRV_SECTOR_SIZE, 28051b0a488SEric Blake remaining_sectors * BDRV_SECTOR_SIZE, 28151b0a488SEric Blake &count); 28229ff7890SWen Congyang if (ret < 0) { 28329ff7890SWen Congyang goto out1; 28429ff7890SWen Congyang } 28529ff7890SWen Congyang 28651b0a488SEric Blake assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); 28751b0a488SEric Blake n = count >> BDRV_SECTOR_BITS; 28829ff7890SWen Congyang qemu_iovec_reset(&hd_qiov); 28951b0a488SEric Blake qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); 29029ff7890SWen Congyang 29129ff7890SWen Congyang target = ret ? top : base; 29204a11d87SEric Blake ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, 29304a11d87SEric Blake n * BDRV_SECTOR_SIZE, &hd_qiov, 0); 29429ff7890SWen Congyang if (ret < 0) { 29529ff7890SWen Congyang goto out1; 29629ff7890SWen Congyang } 29729ff7890SWen Congyang 29829ff7890SWen Congyang remaining_sectors -= n; 29929ff7890SWen Congyang sector_num += n; 30051b0a488SEric Blake bytes_done += count; 30129ff7890SWen Congyang } 30229ff7890SWen Congyang 30329ff7890SWen Congyang out1: 30429ff7890SWen Congyang qemu_iovec_destroy(&hd_qiov); 30529ff7890SWen Congyang out: 30629ff7890SWen Congyang return ret; 30729ff7890SWen Congyang } 30829ff7890SWen Congyang 30929ff7890SWen Congyang static bool replication_recurse_is_first_non_filter(BlockDriverState *bs, 31029ff7890SWen Congyang BlockDriverState *candidate) 31129ff7890SWen Congyang { 31229ff7890SWen Congyang return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); 31329ff7890SWen Congyang } 31429ff7890SWen Congyang 31529ff7890SWen Congyang static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) 31629ff7890SWen Congyang { 31729ff7890SWen Congyang Error *local_err = NULL; 31829ff7890SWen Congyang int ret; 31929ff7890SWen Congyang 320*cc19f177SVladimir Sementsov-Ogievskiy if (!s->backup_job) { 32129ff7890SWen Congyang error_setg(errp, "Backup job was cancelled unexpectedly"); 32229ff7890SWen Congyang return; 32329ff7890SWen Congyang } 32429ff7890SWen Congyang 325*cc19f177SVladimir Sementsov-Ogievskiy backup_do_checkpoint(s->backup_job, &local_err); 32629ff7890SWen Congyang if (local_err) { 32729ff7890SWen Congyang error_propagate(errp, local_err); 32829ff7890SWen Congyang return; 32929ff7890SWen Congyang } 33029ff7890SWen Congyang 331d470ad42SMax Reitz if (!s->active_disk->bs->drv) { 332d470ad42SMax Reitz error_setg(errp, "Active disk %s is ejected", 333d470ad42SMax Reitz s->active_disk->bs->node_name); 334d470ad42SMax Reitz return; 335d470ad42SMax Reitz } 336d470ad42SMax Reitz 33729ff7890SWen Congyang ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs); 33829ff7890SWen Congyang if (ret < 0) { 33929ff7890SWen Congyang error_setg(errp, "Cannot make active disk empty"); 34029ff7890SWen Congyang return; 34129ff7890SWen Congyang } 34229ff7890SWen Congyang 343d470ad42SMax Reitz if (!s->hidden_disk->bs->drv) { 344d470ad42SMax Reitz error_setg(errp, "Hidden disk %s is ejected", 345d470ad42SMax Reitz s->hidden_disk->bs->node_name); 346d470ad42SMax Reitz return; 347d470ad42SMax Reitz } 348d470ad42SMax Reitz 34929ff7890SWen Congyang ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs); 35029ff7890SWen Congyang if (ret < 0) { 35129ff7890SWen Congyang error_setg(errp, "Cannot make hidden disk empty"); 35229ff7890SWen Congyang return; 35329ff7890SWen Congyang } 35429ff7890SWen Congyang } 35529ff7890SWen Congyang 3563c4e9647SAlberto Garcia /* This function is supposed to be called twice: 3573c4e9647SAlberto Garcia * first with writable = true, then with writable = false. 3583c4e9647SAlberto Garcia * The first call puts s->hidden_disk and s->secondary_disk in 3593c4e9647SAlberto Garcia * r/w mode, and the second puts them back in their original state. 3603c4e9647SAlberto Garcia */ 3618dd9006eSPaolo Bonzini static void reopen_backing_file(BlockDriverState *bs, bool writable, 36229ff7890SWen Congyang Error **errp) 36329ff7890SWen Congyang { 3648dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 36529ff7890SWen Congyang BlockReopenQueue *reopen_queue = NULL; 36629ff7890SWen Congyang Error *local_err = NULL; 36729ff7890SWen Congyang 36829ff7890SWen Congyang if (writable) { 3693c4e9647SAlberto Garcia s->orig_hidden_read_only = bdrv_is_read_only(s->hidden_disk->bs); 3703c4e9647SAlberto Garcia s->orig_secondary_read_only = bdrv_is_read_only(s->secondary_disk->bs); 37129ff7890SWen Congyang } 37229ff7890SWen Congyang 3731a63a907SKevin Wolf bdrv_subtree_drained_begin(s->hidden_disk->bs); 3741a63a907SKevin Wolf bdrv_subtree_drained_begin(s->secondary_disk->bs); 3751a63a907SKevin Wolf 3763c4e9647SAlberto Garcia if (s->orig_hidden_read_only) { 3773c4e9647SAlberto Garcia QDict *opts = qdict_new(); 3783c4e9647SAlberto Garcia qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 3793c4e9647SAlberto Garcia reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, 380077e8e20SAlberto Garcia opts, true); 38129ff7890SWen Congyang } 38229ff7890SWen Congyang 3833c4e9647SAlberto Garcia if (s->orig_secondary_read_only) { 3843c4e9647SAlberto Garcia QDict *opts = qdict_new(); 3853c4e9647SAlberto Garcia qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); 38629ff7890SWen Congyang reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, 387077e8e20SAlberto Garcia opts, true); 38829ff7890SWen Congyang } 38929ff7890SWen Congyang 39029ff7890SWen Congyang if (reopen_queue) { 3915019aeceSAlberto Garcia bdrv_reopen_multiple(reopen_queue, &local_err); 39229ff7890SWen Congyang error_propagate(errp, local_err); 39329ff7890SWen Congyang } 3941a63a907SKevin Wolf 3951a63a907SKevin Wolf bdrv_subtree_drained_end(s->hidden_disk->bs); 3961a63a907SKevin Wolf bdrv_subtree_drained_end(s->secondary_disk->bs); 39729ff7890SWen Congyang } 39829ff7890SWen Congyang 3998dd9006eSPaolo Bonzini static void backup_job_cleanup(BlockDriverState *bs) 40029ff7890SWen Congyang { 4018dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 40229ff7890SWen Congyang BlockDriverState *top_bs; 40329ff7890SWen Congyang 40429ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 40529ff7890SWen Congyang if (!top_bs) { 40629ff7890SWen Congyang return; 40729ff7890SWen Congyang } 40829ff7890SWen Congyang bdrv_op_unblock_all(top_bs, s->blocker); 40929ff7890SWen Congyang error_free(s->blocker); 4108dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 41129ff7890SWen Congyang } 41229ff7890SWen Congyang 41329ff7890SWen Congyang static void backup_job_completed(void *opaque, int ret) 41429ff7890SWen Congyang { 4158dd9006eSPaolo Bonzini BlockDriverState *bs = opaque; 4168dd9006eSPaolo Bonzini BDRVReplicationState *s = bs->opaque; 41729ff7890SWen Congyang 4183c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_FAILOVER) { 41929ff7890SWen Congyang /* The backup job is cancelled unexpectedly */ 42029ff7890SWen Congyang s->error = -EIO; 42129ff7890SWen Congyang } 42229ff7890SWen Congyang 4238dd9006eSPaolo Bonzini backup_job_cleanup(bs); 42429ff7890SWen Congyang } 42529ff7890SWen Congyang 42629ff7890SWen Congyang static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) 42729ff7890SWen Congyang { 42829ff7890SWen Congyang BdrvChild *child; 42929ff7890SWen Congyang 43029ff7890SWen Congyang /* The bs itself is the top_bs */ 43129ff7890SWen Congyang if (top_bs == bs) { 43229ff7890SWen Congyang return true; 43329ff7890SWen Congyang } 43429ff7890SWen Congyang 43529ff7890SWen Congyang /* Iterate over top_bs's children */ 43629ff7890SWen Congyang QLIST_FOREACH(child, &top_bs->children, next) { 43729ff7890SWen Congyang if (child->bs == bs || check_top_bs(child->bs, bs)) { 43829ff7890SWen Congyang return true; 43929ff7890SWen Congyang } 44029ff7890SWen Congyang } 44129ff7890SWen Congyang 44229ff7890SWen Congyang return false; 44329ff7890SWen Congyang } 44429ff7890SWen Congyang 44529ff7890SWen Congyang static void replication_start(ReplicationState *rs, ReplicationMode mode, 44629ff7890SWen Congyang Error **errp) 44729ff7890SWen Congyang { 44829ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 44929ff7890SWen Congyang BDRVReplicationState *s; 45029ff7890SWen Congyang BlockDriverState *top_bs; 45129ff7890SWen Congyang int64_t active_length, hidden_length, disk_length; 45229ff7890SWen Congyang AioContext *aio_context; 45329ff7890SWen Congyang Error *local_err = NULL; 45429ff7890SWen Congyang 45529ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 45629ff7890SWen Congyang aio_context_acquire(aio_context); 45729ff7890SWen Congyang s = bs->opaque; 45829ff7890SWen Congyang 4593c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_NONE) { 46029ff7890SWen Congyang error_setg(errp, "Block replication is running or done"); 46129ff7890SWen Congyang aio_context_release(aio_context); 46229ff7890SWen Congyang return; 46329ff7890SWen Congyang } 46429ff7890SWen Congyang 46529ff7890SWen Congyang if (s->mode != mode) { 46629ff7890SWen Congyang error_setg(errp, "The parameter mode's value is invalid, needs %d," 46729ff7890SWen Congyang " but got %d", s->mode, mode); 46829ff7890SWen Congyang aio_context_release(aio_context); 46929ff7890SWen Congyang return; 47029ff7890SWen Congyang } 47129ff7890SWen Congyang 47229ff7890SWen Congyang switch (s->mode) { 47329ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 47429ff7890SWen Congyang break; 47529ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 47629ff7890SWen Congyang s->active_disk = bs->file; 47729ff7890SWen Congyang if (!s->active_disk || !s->active_disk->bs || 47829ff7890SWen Congyang !s->active_disk->bs->backing) { 47929ff7890SWen Congyang error_setg(errp, "Active disk doesn't have backing file"); 48029ff7890SWen Congyang aio_context_release(aio_context); 48129ff7890SWen Congyang return; 48229ff7890SWen Congyang } 48329ff7890SWen Congyang 48429ff7890SWen Congyang s->hidden_disk = s->active_disk->bs->backing; 48529ff7890SWen Congyang if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { 48629ff7890SWen Congyang error_setg(errp, "Hidden disk doesn't have backing file"); 48729ff7890SWen Congyang aio_context_release(aio_context); 48829ff7890SWen Congyang return; 48929ff7890SWen Congyang } 49029ff7890SWen Congyang 49129ff7890SWen Congyang s->secondary_disk = s->hidden_disk->bs->backing; 49229ff7890SWen Congyang if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { 49329ff7890SWen Congyang error_setg(errp, "The secondary disk doesn't have block backend"); 49429ff7890SWen Congyang aio_context_release(aio_context); 49529ff7890SWen Congyang return; 49629ff7890SWen Congyang } 49729ff7890SWen Congyang 49829ff7890SWen Congyang /* verify the length */ 49929ff7890SWen Congyang active_length = bdrv_getlength(s->active_disk->bs); 50029ff7890SWen Congyang hidden_length = bdrv_getlength(s->hidden_disk->bs); 50129ff7890SWen Congyang disk_length = bdrv_getlength(s->secondary_disk->bs); 50229ff7890SWen Congyang if (active_length < 0 || hidden_length < 0 || disk_length < 0 || 50329ff7890SWen Congyang active_length != hidden_length || hidden_length != disk_length) { 50429ff7890SWen Congyang error_setg(errp, "Active disk, hidden disk, secondary disk's length" 50529ff7890SWen Congyang " are not the same"); 50629ff7890SWen Congyang aio_context_release(aio_context); 50729ff7890SWen Congyang return; 50829ff7890SWen Congyang } 50929ff7890SWen Congyang 510d470ad42SMax Reitz /* Must be true, or the bdrv_getlength() calls would have failed */ 511d470ad42SMax Reitz assert(s->active_disk->bs->drv && s->hidden_disk->bs->drv); 512d470ad42SMax Reitz 51329ff7890SWen Congyang if (!s->active_disk->bs->drv->bdrv_make_empty || 51429ff7890SWen Congyang !s->hidden_disk->bs->drv->bdrv_make_empty) { 51529ff7890SWen Congyang error_setg(errp, 51629ff7890SWen Congyang "Active disk or hidden disk doesn't support make_empty"); 51729ff7890SWen Congyang aio_context_release(aio_context); 51829ff7890SWen Congyang return; 51929ff7890SWen Congyang } 52029ff7890SWen Congyang 52129ff7890SWen Congyang /* reopen the backing file in r/w mode */ 5228dd9006eSPaolo Bonzini reopen_backing_file(bs, true, &local_err); 52329ff7890SWen Congyang if (local_err) { 52429ff7890SWen Congyang error_propagate(errp, local_err); 52529ff7890SWen Congyang aio_context_release(aio_context); 52629ff7890SWen Congyang return; 52729ff7890SWen Congyang } 52829ff7890SWen Congyang 52929ff7890SWen Congyang /* start backup job now */ 53029ff7890SWen Congyang error_setg(&s->blocker, 53129ff7890SWen Congyang "Block device is in use by internal backup job"); 53229ff7890SWen Congyang 53329ff7890SWen Congyang top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); 53429ff7890SWen Congyang if (!top_bs || !bdrv_is_root_node(top_bs) || 53529ff7890SWen Congyang !check_top_bs(top_bs, bs)) { 53629ff7890SWen Congyang error_setg(errp, "No top_bs or it is invalid"); 5378dd9006eSPaolo Bonzini reopen_backing_file(bs, false, NULL); 53829ff7890SWen Congyang aio_context_release(aio_context); 53929ff7890SWen Congyang return; 54029ff7890SWen Congyang } 54129ff7890SWen Congyang bdrv_op_block_all(top_bs, s->blocker); 54229ff7890SWen Congyang bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); 54329ff7890SWen Congyang 544*cc19f177SVladimir Sementsov-Ogievskiy s->backup_job = backup_job_create( 545*cc19f177SVladimir Sementsov-Ogievskiy NULL, s->secondary_disk->bs, s->hidden_disk->bs, 546111049a4SJohn Snow 0, MIRROR_SYNC_MODE_NONE, NULL, false, 547111049a4SJohn Snow BLOCKDEV_ON_ERROR_REPORT, 548bb02b65cSKevin Wolf BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, 549111049a4SJohn Snow backup_job_completed, bs, NULL, &local_err); 55029ff7890SWen Congyang if (local_err) { 55129ff7890SWen Congyang error_propagate(errp, local_err); 5528dd9006eSPaolo Bonzini backup_job_cleanup(bs); 55329ff7890SWen Congyang aio_context_release(aio_context); 55429ff7890SWen Congyang return; 55529ff7890SWen Congyang } 556*cc19f177SVladimir Sementsov-Ogievskiy job_start(&s->backup_job->job); 55729ff7890SWen Congyang break; 55829ff7890SWen Congyang default: 55929ff7890SWen Congyang aio_context_release(aio_context); 56029ff7890SWen Congyang abort(); 56129ff7890SWen Congyang } 56229ff7890SWen Congyang 5633c76c606SFam Zheng s->stage = BLOCK_REPLICATION_RUNNING; 56429ff7890SWen Congyang 56529ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 56629ff7890SWen Congyang secondary_do_checkpoint(s, errp); 56729ff7890SWen Congyang } 56829ff7890SWen Congyang 56929ff7890SWen Congyang s->error = 0; 57029ff7890SWen Congyang aio_context_release(aio_context); 57129ff7890SWen Congyang } 57229ff7890SWen Congyang 57329ff7890SWen Congyang static void replication_do_checkpoint(ReplicationState *rs, Error **errp) 57429ff7890SWen Congyang { 57529ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 57629ff7890SWen Congyang BDRVReplicationState *s; 57729ff7890SWen Congyang AioContext *aio_context; 57829ff7890SWen Congyang 57929ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 58029ff7890SWen Congyang aio_context_acquire(aio_context); 58129ff7890SWen Congyang s = bs->opaque; 58229ff7890SWen Congyang 58329ff7890SWen Congyang if (s->mode == REPLICATION_MODE_SECONDARY) { 58429ff7890SWen Congyang secondary_do_checkpoint(s, errp); 58529ff7890SWen Congyang } 58629ff7890SWen Congyang aio_context_release(aio_context); 58729ff7890SWen Congyang } 58829ff7890SWen Congyang 58929ff7890SWen Congyang static void replication_get_error(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 5993c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_RUNNING) { 60029ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 60129ff7890SWen Congyang aio_context_release(aio_context); 60229ff7890SWen Congyang return; 60329ff7890SWen Congyang } 60429ff7890SWen Congyang 60529ff7890SWen Congyang if (s->error) { 60629ff7890SWen Congyang error_setg(errp, "I/O error occurred"); 60729ff7890SWen Congyang aio_context_release(aio_context); 60829ff7890SWen Congyang return; 60929ff7890SWen Congyang } 61029ff7890SWen Congyang aio_context_release(aio_context); 61129ff7890SWen Congyang } 61229ff7890SWen Congyang 61329ff7890SWen Congyang static void replication_done(void *opaque, int ret) 61429ff7890SWen Congyang { 61529ff7890SWen Congyang BlockDriverState *bs = opaque; 61629ff7890SWen Congyang BDRVReplicationState *s = bs->opaque; 61729ff7890SWen Congyang 61829ff7890SWen Congyang if (ret == 0) { 6193c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 62029ff7890SWen Congyang 62129ff7890SWen Congyang s->active_disk = NULL; 62229ff7890SWen Congyang s->secondary_disk = NULL; 62329ff7890SWen Congyang s->hidden_disk = NULL; 62429ff7890SWen Congyang s->error = 0; 62529ff7890SWen Congyang } else { 6263c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; 62729ff7890SWen Congyang s->error = -EIO; 62829ff7890SWen Congyang } 62929ff7890SWen Congyang } 63029ff7890SWen Congyang 63129ff7890SWen Congyang static void replication_stop(ReplicationState *rs, bool failover, Error **errp) 63229ff7890SWen Congyang { 63329ff7890SWen Congyang BlockDriverState *bs = rs->opaque; 63429ff7890SWen Congyang BDRVReplicationState *s; 63529ff7890SWen Congyang AioContext *aio_context; 63629ff7890SWen Congyang 63729ff7890SWen Congyang aio_context = bdrv_get_aio_context(bs); 63829ff7890SWen Congyang aio_context_acquire(aio_context); 63929ff7890SWen Congyang s = bs->opaque; 64029ff7890SWen Congyang 6413c76c606SFam Zheng if (s->stage != BLOCK_REPLICATION_RUNNING) { 64229ff7890SWen Congyang error_setg(errp, "Block replication is not running"); 64329ff7890SWen Congyang aio_context_release(aio_context); 64429ff7890SWen Congyang return; 64529ff7890SWen Congyang } 64629ff7890SWen Congyang 64729ff7890SWen Congyang switch (s->mode) { 64829ff7890SWen Congyang case REPLICATION_MODE_PRIMARY: 6493c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 65029ff7890SWen Congyang s->error = 0; 65129ff7890SWen Congyang break; 65229ff7890SWen Congyang case REPLICATION_MODE_SECONDARY: 65329ff7890SWen Congyang /* 65429ff7890SWen Congyang * This BDS will be closed, and the job should be completed 65529ff7890SWen Congyang * before the BDS is closed, because we will access hidden 65629ff7890SWen Congyang * disk, secondary disk in backup_job_completed(). 65729ff7890SWen Congyang */ 658*cc19f177SVladimir Sementsov-Ogievskiy if (s->backup_job) { 659*cc19f177SVladimir Sementsov-Ogievskiy job_cancel_sync(&s->backup_job->job); 66029ff7890SWen Congyang } 66129ff7890SWen Congyang 66229ff7890SWen Congyang if (!failover) { 66329ff7890SWen Congyang secondary_do_checkpoint(s, errp); 6643c76c606SFam Zheng s->stage = BLOCK_REPLICATION_DONE; 66529ff7890SWen Congyang aio_context_release(aio_context); 66629ff7890SWen Congyang return; 66729ff7890SWen Congyang } 66829ff7890SWen Congyang 6693c76c606SFam Zheng s->stage = BLOCK_REPLICATION_FAILOVER; 670*cc19f177SVladimir Sementsov-Ogievskiy s->commit_job = commit_active_start( 671*cc19f177SVladimir Sementsov-Ogievskiy NULL, s->active_disk->bs, s->secondary_disk->bs, 672bb02b65cSKevin Wolf JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, 67378bbd910SFam Zheng NULL, replication_done, bs, true, errp); 67429ff7890SWen Congyang break; 67529ff7890SWen Congyang default: 67629ff7890SWen Congyang aio_context_release(aio_context); 67729ff7890SWen Congyang abort(); 67829ff7890SWen Congyang } 67929ff7890SWen Congyang aio_context_release(aio_context); 68029ff7890SWen Congyang } 68129ff7890SWen Congyang 6822654267cSMax Reitz static const char *const replication_strong_runtime_opts[] = { 6832654267cSMax Reitz REPLICATION_MODE, 6842654267cSMax Reitz REPLICATION_TOP_ID, 6852654267cSMax Reitz 6862654267cSMax Reitz NULL 6872654267cSMax Reitz }; 6882654267cSMax Reitz 689782b9d06SAlberto Garcia static BlockDriver bdrv_replication = { 69029ff7890SWen Congyang .format_name = "replication", 69129ff7890SWen Congyang .instance_size = sizeof(BDRVReplicationState), 69229ff7890SWen Congyang 69329ff7890SWen Congyang .bdrv_open = replication_open, 69429ff7890SWen Congyang .bdrv_close = replication_close, 69537a9051cSChanglong Xie .bdrv_child_perm = replication_child_perm, 69629ff7890SWen Congyang 69729ff7890SWen Congyang .bdrv_getlength = replication_getlength, 69829ff7890SWen Congyang .bdrv_co_readv = replication_co_readv, 69929ff7890SWen Congyang .bdrv_co_writev = replication_co_writev, 70029ff7890SWen Congyang 70129ff7890SWen Congyang .is_filter = true, 70229ff7890SWen Congyang .bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter, 70329ff7890SWen Congyang 70429ff7890SWen Congyang .has_variable_length = true, 7052654267cSMax Reitz .strong_runtime_opts = replication_strong_runtime_opts, 70629ff7890SWen Congyang }; 70729ff7890SWen Congyang 70829ff7890SWen Congyang static void bdrv_replication_init(void) 70929ff7890SWen Congyang { 71029ff7890SWen Congyang bdrv_register(&bdrv_replication); 71129ff7890SWen Congyang } 71229ff7890SWen Congyang 71329ff7890SWen Congyang block_init(bdrv_replication_init); 714