1 | /* |
2 | * Replication Block filter |
3 | * |
4 | * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. |
5 | * Copyright (c) 2016 Intel Corporation |
6 | * Copyright (c) 2016 FUJITSU LIMITED |
7 | * |
8 | * Author: |
9 | * Wen Congyang <wency@cn.fujitsu.com> |
10 | * |
11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
12 | * See the COPYING file in the top-level directory. |
13 | */ |
14 | |
15 | #include "qemu/osdep.h" |
16 | #include "qemu/module.h" |
17 | #include "qemu/option.h" |
18 | #include "block/nbd.h" |
19 | #include "block/blockjob.h" |
20 | #include "block/block_int.h" |
21 | #include "block/block_backup.h" |
22 | #include "sysemu/block-backend.h" |
23 | #include "qapi/error.h" |
24 | #include "qapi/qmp/qdict.h" |
25 | #include "replication.h" |
26 | |
27 | typedef enum { |
28 | BLOCK_REPLICATION_NONE, /* block replication is not started */ |
29 | BLOCK_REPLICATION_RUNNING, /* block replication is running */ |
30 | BLOCK_REPLICATION_FAILOVER, /* failover is running in background */ |
31 | BLOCK_REPLICATION_FAILOVER_FAILED, /* failover failed */ |
32 | BLOCK_REPLICATION_DONE, /* block replication is done */ |
33 | } ReplicationStage; |
34 | |
35 | typedef struct BDRVReplicationState { |
36 | ReplicationMode mode; |
37 | ReplicationStage stage; |
38 | BdrvChild *active_disk; |
39 | BlockJob *commit_job; |
40 | BdrvChild *hidden_disk; |
41 | BdrvChild *secondary_disk; |
42 | BlockJob *backup_job; |
43 | char *top_id; |
44 | ReplicationState *rs; |
45 | Error *blocker; |
46 | bool orig_hidden_read_only; |
47 | bool orig_secondary_read_only; |
48 | int error; |
49 | } BDRVReplicationState; |
50 | |
51 | static void replication_start(ReplicationState *rs, ReplicationMode mode, |
52 | Error **errp); |
53 | static void replication_do_checkpoint(ReplicationState *rs, Error **errp); |
54 | static void replication_get_error(ReplicationState *rs, Error **errp); |
55 | static void replication_stop(ReplicationState *rs, bool failover, |
56 | Error **errp); |
57 | |
58 | #define REPLICATION_MODE "mode" |
59 | #define REPLICATION_TOP_ID "top-id" |
60 | static QemuOptsList replication_runtime_opts = { |
61 | .name = "replication" , |
62 | .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), |
63 | .desc = { |
64 | { |
65 | .name = REPLICATION_MODE, |
66 | .type = QEMU_OPT_STRING, |
67 | }, |
68 | { |
69 | .name = REPLICATION_TOP_ID, |
70 | .type = QEMU_OPT_STRING, |
71 | }, |
72 | { /* end of list */ } |
73 | }, |
74 | }; |
75 | |
76 | static ReplicationOps replication_ops = { |
77 | .start = replication_start, |
78 | .checkpoint = replication_do_checkpoint, |
79 | .get_error = replication_get_error, |
80 | .stop = replication_stop, |
81 | }; |
82 | |
83 | static int replication_open(BlockDriverState *bs, QDict *options, |
84 | int flags, Error **errp) |
85 | { |
86 | int ret; |
87 | BDRVReplicationState *s = bs->opaque; |
88 | Error *local_err = NULL; |
89 | QemuOpts *opts = NULL; |
90 | const char *mode; |
91 | const char *top_id; |
92 | |
93 | bs->file = bdrv_open_child(NULL, options, "file" , bs, &child_file, |
94 | false, errp); |
95 | if (!bs->file) { |
96 | return -EINVAL; |
97 | } |
98 | |
99 | ret = -EINVAL; |
100 | opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); |
101 | qemu_opts_absorb_qdict(opts, options, &local_err); |
102 | if (local_err) { |
103 | goto fail; |
104 | } |
105 | |
106 | mode = qemu_opt_get(opts, REPLICATION_MODE); |
107 | if (!mode) { |
108 | error_setg(&local_err, "Missing the option mode" ); |
109 | goto fail; |
110 | } |
111 | |
112 | if (!strcmp(mode, "primary" )) { |
113 | s->mode = REPLICATION_MODE_PRIMARY; |
114 | top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); |
115 | if (top_id) { |
116 | error_setg(&local_err, "The primary side does not support option top-id" ); |
117 | goto fail; |
118 | } |
119 | } else if (!strcmp(mode, "secondary" )) { |
120 | s->mode = REPLICATION_MODE_SECONDARY; |
121 | top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); |
122 | s->top_id = g_strdup(top_id); |
123 | if (!s->top_id) { |
124 | error_setg(&local_err, "Missing the option top-id" ); |
125 | goto fail; |
126 | } |
127 | } else { |
128 | error_setg(&local_err, |
129 | "The option mode's value should be primary or secondary" ); |
130 | goto fail; |
131 | } |
132 | |
133 | s->rs = replication_new(bs, &replication_ops); |
134 | |
135 | ret = 0; |
136 | |
137 | fail: |
138 | qemu_opts_del(opts); |
139 | error_propagate(errp, local_err); |
140 | |
141 | return ret; |
142 | } |
143 | |
144 | static void replication_close(BlockDriverState *bs) |
145 | { |
146 | BDRVReplicationState *s = bs->opaque; |
147 | |
148 | if (s->stage == BLOCK_REPLICATION_RUNNING) { |
149 | replication_stop(s->rs, false, NULL); |
150 | } |
151 | if (s->stage == BLOCK_REPLICATION_FAILOVER) { |
152 | job_cancel_sync(&s->commit_job->job); |
153 | } |
154 | |
155 | if (s->mode == REPLICATION_MODE_SECONDARY) { |
156 | g_free(s->top_id); |
157 | } |
158 | |
159 | replication_remove(s->rs); |
160 | } |
161 | |
162 | static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, |
163 | const BdrvChildRole *role, |
164 | BlockReopenQueue *reopen_queue, |
165 | uint64_t perm, uint64_t shared, |
166 | uint64_t *nperm, uint64_t *nshared) |
167 | { |
168 | *nperm = BLK_PERM_CONSISTENT_READ; |
169 | if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { |
170 | *nperm |= BLK_PERM_WRITE; |
171 | } |
172 | *nshared = BLK_PERM_CONSISTENT_READ \ |
173 | | BLK_PERM_WRITE \ |
174 | | BLK_PERM_WRITE_UNCHANGED; |
175 | return; |
176 | } |
177 | |
178 | static int64_t replication_getlength(BlockDriverState *bs) |
179 | { |
180 | return bdrv_getlength(bs->file->bs); |
181 | } |
182 | |
183 | static int replication_get_io_status(BDRVReplicationState *s) |
184 | { |
185 | switch (s->stage) { |
186 | case BLOCK_REPLICATION_NONE: |
187 | return -EIO; |
188 | case BLOCK_REPLICATION_RUNNING: |
189 | return 0; |
190 | case BLOCK_REPLICATION_FAILOVER: |
191 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; |
192 | case BLOCK_REPLICATION_FAILOVER_FAILED: |
193 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; |
194 | case BLOCK_REPLICATION_DONE: |
195 | /* |
196 | * active commit job completes, and active disk and secondary_disk |
197 | * is swapped, so we can operate bs->file directly |
198 | */ |
199 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; |
200 | default: |
201 | abort(); |
202 | } |
203 | } |
204 | |
205 | static int replication_return_value(BDRVReplicationState *s, int ret) |
206 | { |
207 | if (s->mode == REPLICATION_MODE_SECONDARY) { |
208 | return ret; |
209 | } |
210 | |
211 | if (ret < 0) { |
212 | s->error = ret; |
213 | ret = 0; |
214 | } |
215 | |
216 | return ret; |
217 | } |
218 | |
219 | static coroutine_fn int replication_co_readv(BlockDriverState *bs, |
220 | int64_t sector_num, |
221 | int remaining_sectors, |
222 | QEMUIOVector *qiov) |
223 | { |
224 | BDRVReplicationState *s = bs->opaque; |
225 | int ret; |
226 | |
227 | if (s->mode == REPLICATION_MODE_PRIMARY) { |
228 | /* We only use it to forward primary write requests */ |
229 | return -EIO; |
230 | } |
231 | |
232 | ret = replication_get_io_status(s); |
233 | if (ret < 0) { |
234 | return ret; |
235 | } |
236 | |
237 | ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, |
238 | remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); |
239 | |
240 | return replication_return_value(s, ret); |
241 | } |
242 | |
243 | static coroutine_fn int replication_co_writev(BlockDriverState *bs, |
244 | int64_t sector_num, |
245 | int remaining_sectors, |
246 | QEMUIOVector *qiov, |
247 | int flags) |
248 | { |
249 | BDRVReplicationState *s = bs->opaque; |
250 | QEMUIOVector hd_qiov; |
251 | uint64_t bytes_done = 0; |
252 | BdrvChild *top = bs->file; |
253 | BdrvChild *base = s->secondary_disk; |
254 | BdrvChild *target; |
255 | int ret; |
256 | int64_t n; |
257 | |
258 | assert(!flags); |
259 | ret = replication_get_io_status(s); |
260 | if (ret < 0) { |
261 | goto out; |
262 | } |
263 | |
264 | if (ret == 0) { |
265 | ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, |
266 | remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); |
267 | return replication_return_value(s, ret); |
268 | } |
269 | |
270 | /* |
271 | * Failover failed, only write to active disk if the sectors |
272 | * have already been allocated in active disk/hidden disk. |
273 | */ |
274 | qemu_iovec_init(&hd_qiov, qiov->niov); |
275 | while (remaining_sectors > 0) { |
276 | int64_t count; |
277 | |
278 | ret = bdrv_is_allocated_above(top->bs, base->bs, false, |
279 | sector_num * BDRV_SECTOR_SIZE, |
280 | remaining_sectors * BDRV_SECTOR_SIZE, |
281 | &count); |
282 | if (ret < 0) { |
283 | goto out1; |
284 | } |
285 | |
286 | assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); |
287 | n = count >> BDRV_SECTOR_BITS; |
288 | qemu_iovec_reset(&hd_qiov); |
289 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); |
290 | |
291 | target = ret ? top : base; |
292 | ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, |
293 | n * BDRV_SECTOR_SIZE, &hd_qiov, 0); |
294 | if (ret < 0) { |
295 | goto out1; |
296 | } |
297 | |
298 | remaining_sectors -= n; |
299 | sector_num += n; |
300 | bytes_done += count; |
301 | } |
302 | |
303 | out1: |
304 | qemu_iovec_destroy(&hd_qiov); |
305 | out: |
306 | return ret; |
307 | } |
308 | |
309 | static bool replication_recurse_is_first_non_filter(BlockDriverState *bs, |
310 | BlockDriverState *candidate) |
311 | { |
312 | return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); |
313 | } |
314 | |
315 | static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) |
316 | { |
317 | Error *local_err = NULL; |
318 | int ret; |
319 | |
320 | if (!s->backup_job) { |
321 | error_setg(errp, "Backup job was cancelled unexpectedly" ); |
322 | return; |
323 | } |
324 | |
325 | backup_do_checkpoint(s->backup_job, &local_err); |
326 | if (local_err) { |
327 | error_propagate(errp, local_err); |
328 | return; |
329 | } |
330 | |
331 | if (!s->active_disk->bs->drv) { |
332 | error_setg(errp, "Active disk %s is ejected" , |
333 | s->active_disk->bs->node_name); |
334 | return; |
335 | } |
336 | |
337 | ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs); |
338 | if (ret < 0) { |
339 | error_setg(errp, "Cannot make active disk empty" ); |
340 | return; |
341 | } |
342 | |
343 | if (!s->hidden_disk->bs->drv) { |
344 | error_setg(errp, "Hidden disk %s is ejected" , |
345 | s->hidden_disk->bs->node_name); |
346 | return; |
347 | } |
348 | |
349 | ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs); |
350 | if (ret < 0) { |
351 | error_setg(errp, "Cannot make hidden disk empty" ); |
352 | return; |
353 | } |
354 | } |
355 | |
356 | /* This function is supposed to be called twice: |
357 | * first with writable = true, then with writable = false. |
358 | * The first call puts s->hidden_disk and s->secondary_disk in |
359 | * r/w mode, and the second puts them back in their original state. |
360 | */ |
361 | static void reopen_backing_file(BlockDriverState *bs, bool writable, |
362 | Error **errp) |
363 | { |
364 | BDRVReplicationState *s = bs->opaque; |
365 | BlockReopenQueue *reopen_queue = NULL; |
366 | Error *local_err = NULL; |
367 | |
368 | if (writable) { |
369 | s->orig_hidden_read_only = bdrv_is_read_only(s->hidden_disk->bs); |
370 | s->orig_secondary_read_only = bdrv_is_read_only(s->secondary_disk->bs); |
371 | } |
372 | |
373 | bdrv_subtree_drained_begin(s->hidden_disk->bs); |
374 | bdrv_subtree_drained_begin(s->secondary_disk->bs); |
375 | |
376 | if (s->orig_hidden_read_only) { |
377 | QDict *opts = qdict_new(); |
378 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); |
379 | reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, |
380 | opts, true); |
381 | } |
382 | |
383 | if (s->orig_secondary_read_only) { |
384 | QDict *opts = qdict_new(); |
385 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); |
386 | reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, |
387 | opts, true); |
388 | } |
389 | |
390 | if (reopen_queue) { |
391 | bdrv_reopen_multiple(reopen_queue, &local_err); |
392 | error_propagate(errp, local_err); |
393 | } |
394 | |
395 | bdrv_subtree_drained_end(s->hidden_disk->bs); |
396 | bdrv_subtree_drained_end(s->secondary_disk->bs); |
397 | } |
398 | |
399 | static void backup_job_cleanup(BlockDriverState *bs) |
400 | { |
401 | BDRVReplicationState *s = bs->opaque; |
402 | BlockDriverState *top_bs; |
403 | |
404 | top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); |
405 | if (!top_bs) { |
406 | return; |
407 | } |
408 | bdrv_op_unblock_all(top_bs, s->blocker); |
409 | error_free(s->blocker); |
410 | reopen_backing_file(bs, false, NULL); |
411 | } |
412 | |
413 | static void backup_job_completed(void *opaque, int ret) |
414 | { |
415 | BlockDriverState *bs = opaque; |
416 | BDRVReplicationState *s = bs->opaque; |
417 | |
418 | if (s->stage != BLOCK_REPLICATION_FAILOVER) { |
419 | /* The backup job is cancelled unexpectedly */ |
420 | s->error = -EIO; |
421 | } |
422 | |
423 | backup_job_cleanup(bs); |
424 | } |
425 | |
426 | static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) |
427 | { |
428 | BdrvChild *child; |
429 | |
430 | /* The bs itself is the top_bs */ |
431 | if (top_bs == bs) { |
432 | return true; |
433 | } |
434 | |
435 | /* Iterate over top_bs's children */ |
436 | QLIST_FOREACH(child, &top_bs->children, next) { |
437 | if (child->bs == bs || check_top_bs(child->bs, bs)) { |
438 | return true; |
439 | } |
440 | } |
441 | |
442 | return false; |
443 | } |
444 | |
445 | static void replication_start(ReplicationState *rs, ReplicationMode mode, |
446 | Error **errp) |
447 | { |
448 | BlockDriverState *bs = rs->opaque; |
449 | BDRVReplicationState *s; |
450 | BlockDriverState *top_bs; |
451 | int64_t active_length, hidden_length, disk_length; |
452 | AioContext *aio_context; |
453 | Error *local_err = NULL; |
454 | |
455 | aio_context = bdrv_get_aio_context(bs); |
456 | aio_context_acquire(aio_context); |
457 | s = bs->opaque; |
458 | |
459 | if (s->stage != BLOCK_REPLICATION_NONE) { |
460 | error_setg(errp, "Block replication is running or done" ); |
461 | aio_context_release(aio_context); |
462 | return; |
463 | } |
464 | |
465 | if (s->mode != mode) { |
466 | error_setg(errp, "The parameter mode's value is invalid, needs %d," |
467 | " but got %d" , s->mode, mode); |
468 | aio_context_release(aio_context); |
469 | return; |
470 | } |
471 | |
472 | switch (s->mode) { |
473 | case REPLICATION_MODE_PRIMARY: |
474 | break; |
475 | case REPLICATION_MODE_SECONDARY: |
476 | s->active_disk = bs->file; |
477 | if (!s->active_disk || !s->active_disk->bs || |
478 | !s->active_disk->bs->backing) { |
479 | error_setg(errp, "Active disk doesn't have backing file" ); |
480 | aio_context_release(aio_context); |
481 | return; |
482 | } |
483 | |
484 | s->hidden_disk = s->active_disk->bs->backing; |
485 | if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { |
486 | error_setg(errp, "Hidden disk doesn't have backing file" ); |
487 | aio_context_release(aio_context); |
488 | return; |
489 | } |
490 | |
491 | s->secondary_disk = s->hidden_disk->bs->backing; |
492 | if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { |
493 | error_setg(errp, "The secondary disk doesn't have block backend" ); |
494 | aio_context_release(aio_context); |
495 | return; |
496 | } |
497 | |
498 | /* verify the length */ |
499 | active_length = bdrv_getlength(s->active_disk->bs); |
500 | hidden_length = bdrv_getlength(s->hidden_disk->bs); |
501 | disk_length = bdrv_getlength(s->secondary_disk->bs); |
502 | if (active_length < 0 || hidden_length < 0 || disk_length < 0 || |
503 | active_length != hidden_length || hidden_length != disk_length) { |
504 | error_setg(errp, "Active disk, hidden disk, secondary disk's length" |
505 | " are not the same" ); |
506 | aio_context_release(aio_context); |
507 | return; |
508 | } |
509 | |
510 | /* Must be true, or the bdrv_getlength() calls would have failed */ |
511 | assert(s->active_disk->bs->drv && s->hidden_disk->bs->drv); |
512 | |
513 | if (!s->active_disk->bs->drv->bdrv_make_empty || |
514 | !s->hidden_disk->bs->drv->bdrv_make_empty) { |
515 | error_setg(errp, |
516 | "Active disk or hidden disk doesn't support make_empty" ); |
517 | aio_context_release(aio_context); |
518 | return; |
519 | } |
520 | |
521 | /* reopen the backing file in r/w mode */ |
522 | reopen_backing_file(bs, true, &local_err); |
523 | if (local_err) { |
524 | error_propagate(errp, local_err); |
525 | aio_context_release(aio_context); |
526 | return; |
527 | } |
528 | |
529 | /* start backup job now */ |
530 | error_setg(&s->blocker, |
531 | "Block device is in use by internal backup job" ); |
532 | |
533 | top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); |
534 | if (!top_bs || !bdrv_is_root_node(top_bs) || |
535 | !check_top_bs(top_bs, bs)) { |
536 | error_setg(errp, "No top_bs or it is invalid" ); |
537 | reopen_backing_file(bs, false, NULL); |
538 | aio_context_release(aio_context); |
539 | return; |
540 | } |
541 | bdrv_op_block_all(top_bs, s->blocker); |
542 | bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); |
543 | |
544 | s->backup_job = backup_job_create( |
545 | NULL, s->secondary_disk->bs, s->hidden_disk->bs, |
546 | 0, MIRROR_SYNC_MODE_NONE, NULL, 0, false, |
547 | BLOCKDEV_ON_ERROR_REPORT, |
548 | BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, |
549 | backup_job_completed, bs, NULL, &local_err); |
550 | if (local_err) { |
551 | error_propagate(errp, local_err); |
552 | backup_job_cleanup(bs); |
553 | aio_context_release(aio_context); |
554 | return; |
555 | } |
556 | job_start(&s->backup_job->job); |
557 | break; |
558 | default: |
559 | aio_context_release(aio_context); |
560 | abort(); |
561 | } |
562 | |
563 | s->stage = BLOCK_REPLICATION_RUNNING; |
564 | |
565 | if (s->mode == REPLICATION_MODE_SECONDARY) { |
566 | secondary_do_checkpoint(s, errp); |
567 | } |
568 | |
569 | s->error = 0; |
570 | aio_context_release(aio_context); |
571 | } |
572 | |
573 | static void replication_do_checkpoint(ReplicationState *rs, Error **errp) |
574 | { |
575 | BlockDriverState *bs = rs->opaque; |
576 | BDRVReplicationState *s; |
577 | AioContext *aio_context; |
578 | |
579 | aio_context = bdrv_get_aio_context(bs); |
580 | aio_context_acquire(aio_context); |
581 | s = bs->opaque; |
582 | |
583 | if (s->mode == REPLICATION_MODE_SECONDARY) { |
584 | secondary_do_checkpoint(s, errp); |
585 | } |
586 | aio_context_release(aio_context); |
587 | } |
588 | |
589 | static void replication_get_error(ReplicationState *rs, Error **errp) |
590 | { |
591 | BlockDriverState *bs = rs->opaque; |
592 | BDRVReplicationState *s; |
593 | AioContext *aio_context; |
594 | |
595 | aio_context = bdrv_get_aio_context(bs); |
596 | aio_context_acquire(aio_context); |
597 | s = bs->opaque; |
598 | |
599 | if (s->stage != BLOCK_REPLICATION_RUNNING) { |
600 | error_setg(errp, "Block replication is not running" ); |
601 | aio_context_release(aio_context); |
602 | return; |
603 | } |
604 | |
605 | if (s->error) { |
606 | error_setg(errp, "I/O error occurred" ); |
607 | aio_context_release(aio_context); |
608 | return; |
609 | } |
610 | aio_context_release(aio_context); |
611 | } |
612 | |
613 | static void replication_done(void *opaque, int ret) |
614 | { |
615 | BlockDriverState *bs = opaque; |
616 | BDRVReplicationState *s = bs->opaque; |
617 | |
618 | if (ret == 0) { |
619 | s->stage = BLOCK_REPLICATION_DONE; |
620 | |
621 | s->active_disk = NULL; |
622 | s->secondary_disk = NULL; |
623 | s->hidden_disk = NULL; |
624 | s->error = 0; |
625 | } else { |
626 | s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; |
627 | s->error = -EIO; |
628 | } |
629 | } |
630 | |
631 | static void replication_stop(ReplicationState *rs, bool failover, Error **errp) |
632 | { |
633 | BlockDriverState *bs = rs->opaque; |
634 | BDRVReplicationState *s; |
635 | AioContext *aio_context; |
636 | |
637 | aio_context = bdrv_get_aio_context(bs); |
638 | aio_context_acquire(aio_context); |
639 | s = bs->opaque; |
640 | |
641 | if (s->stage != BLOCK_REPLICATION_RUNNING) { |
642 | error_setg(errp, "Block replication is not running" ); |
643 | aio_context_release(aio_context); |
644 | return; |
645 | } |
646 | |
647 | switch (s->mode) { |
648 | case REPLICATION_MODE_PRIMARY: |
649 | s->stage = BLOCK_REPLICATION_DONE; |
650 | s->error = 0; |
651 | break; |
652 | case REPLICATION_MODE_SECONDARY: |
653 | /* |
654 | * This BDS will be closed, and the job should be completed |
655 | * before the BDS is closed, because we will access hidden |
656 | * disk, secondary disk in backup_job_completed(). |
657 | */ |
658 | if (s->backup_job) { |
659 | job_cancel_sync(&s->backup_job->job); |
660 | } |
661 | |
662 | if (!failover) { |
663 | secondary_do_checkpoint(s, errp); |
664 | s->stage = BLOCK_REPLICATION_DONE; |
665 | aio_context_release(aio_context); |
666 | return; |
667 | } |
668 | |
669 | s->stage = BLOCK_REPLICATION_FAILOVER; |
670 | s->commit_job = commit_active_start( |
671 | NULL, s->active_disk->bs, s->secondary_disk->bs, |
672 | JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, |
673 | NULL, replication_done, bs, true, errp); |
674 | break; |
675 | default: |
676 | aio_context_release(aio_context); |
677 | abort(); |
678 | } |
679 | aio_context_release(aio_context); |
680 | } |
681 | |
682 | static const char *const replication_strong_runtime_opts[] = { |
683 | REPLICATION_MODE, |
684 | REPLICATION_TOP_ID, |
685 | |
686 | NULL |
687 | }; |
688 | |
689 | static BlockDriver bdrv_replication = { |
690 | .format_name = "replication" , |
691 | .instance_size = sizeof(BDRVReplicationState), |
692 | |
693 | .bdrv_open = replication_open, |
694 | .bdrv_close = replication_close, |
695 | .bdrv_child_perm = replication_child_perm, |
696 | |
697 | .bdrv_getlength = replication_getlength, |
698 | .bdrv_co_readv = replication_co_readv, |
699 | .bdrv_co_writev = replication_co_writev, |
700 | |
701 | .is_filter = true, |
702 | .bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter, |
703 | |
704 | .has_variable_length = true, |
705 | .strong_runtime_opts = replication_strong_runtime_opts, |
706 | }; |
707 | |
708 | static void bdrv_replication_init(void) |
709 | { |
710 | bdrv_register(&bdrv_replication); |
711 | } |
712 | |
713 | block_init(bdrv_replication_init); |
714 | |