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29ff7890 WC |
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" | |
0b8fa32f | 16 | #include "qemu/module.h" |
922a01a0 | 17 | #include "qemu/option.h" |
29ff7890 WC |
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" | |
3c4e9647 | 24 | #include "qapi/qmp/qdict.h" |
29ff7890 WC |
25 | #include "replication.h" |
26 | ||
3c76c606 FZ |
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 | ||
29ff7890 WC |
35 | typedef struct BDRVReplicationState { |
36 | ReplicationMode mode; | |
3c76c606 | 37 | ReplicationStage stage; |
29ff7890 WC |
38 | BdrvChild *active_disk; |
39 | BdrvChild *hidden_disk; | |
40 | BdrvChild *secondary_disk; | |
41 | char *top_id; | |
42 | ReplicationState *rs; | |
43 | Error *blocker; | |
3c4e9647 AG |
44 | bool orig_hidden_read_only; |
45 | bool orig_secondary_read_only; | |
29ff7890 WC |
46 | int error; |
47 | } BDRVReplicationState; | |
48 | ||
29ff7890 WC |
49 | static void replication_start(ReplicationState *rs, ReplicationMode mode, |
50 | Error **errp); | |
51 | static void replication_do_checkpoint(ReplicationState *rs, Error **errp); | |
52 | static void replication_get_error(ReplicationState *rs, Error **errp); | |
53 | static void replication_stop(ReplicationState *rs, bool failover, | |
54 | Error **errp); | |
55 | ||
56 | #define REPLICATION_MODE "mode" | |
57 | #define REPLICATION_TOP_ID "top-id" | |
58 | static QemuOptsList replication_runtime_opts = { | |
59 | .name = "replication", | |
60 | .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), | |
61 | .desc = { | |
62 | { | |
63 | .name = REPLICATION_MODE, | |
64 | .type = QEMU_OPT_STRING, | |
65 | }, | |
66 | { | |
67 | .name = REPLICATION_TOP_ID, | |
68 | .type = QEMU_OPT_STRING, | |
69 | }, | |
70 | { /* end of list */ } | |
71 | }, | |
72 | }; | |
73 | ||
74 | static ReplicationOps replication_ops = { | |
75 | .start = replication_start, | |
76 | .checkpoint = replication_do_checkpoint, | |
77 | .get_error = replication_get_error, | |
78 | .stop = replication_stop, | |
79 | }; | |
80 | ||
81 | static int replication_open(BlockDriverState *bs, QDict *options, | |
82 | int flags, Error **errp) | |
83 | { | |
84 | int ret; | |
85 | BDRVReplicationState *s = bs->opaque; | |
86 | Error *local_err = NULL; | |
87 | QemuOpts *opts = NULL; | |
88 | const char *mode; | |
89 | const char *top_id; | |
90 | ||
4e4bf5c4 KW |
91 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
92 | false, errp); | |
93 | if (!bs->file) { | |
94 | return -EINVAL; | |
95 | } | |
96 | ||
29ff7890 WC |
97 | ret = -EINVAL; |
98 | opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); | |
99 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
100 | if (local_err) { | |
101 | goto fail; | |
102 | } | |
103 | ||
104 | mode = qemu_opt_get(opts, REPLICATION_MODE); | |
105 | if (!mode) { | |
106 | error_setg(&local_err, "Missing the option mode"); | |
107 | goto fail; | |
108 | } | |
109 | ||
110 | if (!strcmp(mode, "primary")) { | |
111 | s->mode = REPLICATION_MODE_PRIMARY; | |
f4f2539b CX |
112 | top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); |
113 | if (top_id) { | |
114 | error_setg(&local_err, "The primary side does not support option top-id"); | |
115 | goto fail; | |
116 | } | |
29ff7890 WC |
117 | } else if (!strcmp(mode, "secondary")) { |
118 | s->mode = REPLICATION_MODE_SECONDARY; | |
119 | top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); | |
120 | s->top_id = g_strdup(top_id); | |
121 | if (!s->top_id) { | |
122 | error_setg(&local_err, "Missing the option top-id"); | |
123 | goto fail; | |
124 | } | |
125 | } else { | |
126 | error_setg(&local_err, | |
127 | "The option mode's value should be primary or secondary"); | |
128 | goto fail; | |
129 | } | |
130 | ||
131 | s->rs = replication_new(bs, &replication_ops); | |
132 | ||
133 | ret = 0; | |
134 | ||
135 | fail: | |
136 | qemu_opts_del(opts); | |
137 | error_propagate(errp, local_err); | |
138 | ||
139 | return ret; | |
140 | } | |
141 | ||
142 | static void replication_close(BlockDriverState *bs) | |
143 | { | |
144 | BDRVReplicationState *s = bs->opaque; | |
145 | ||
3c76c606 | 146 | if (s->stage == BLOCK_REPLICATION_RUNNING) { |
29ff7890 WC |
147 | replication_stop(s->rs, false, NULL); |
148 | } | |
3c76c606 | 149 | if (s->stage == BLOCK_REPLICATION_FAILOVER) { |
3d70ff53 | 150 | job_cancel_sync(&s->active_disk->bs->job->job); |
50ab0e09 | 151 | } |
29ff7890 WC |
152 | |
153 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
154 | g_free(s->top_id); | |
155 | } | |
156 | ||
157 | replication_remove(s->rs); | |
158 | } | |
159 | ||
37a9051c CX |
160 | static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, |
161 | const BdrvChildRole *role, | |
e0995dc3 | 162 | BlockReopenQueue *reopen_queue, |
37a9051c CX |
163 | uint64_t perm, uint64_t shared, |
164 | uint64_t *nperm, uint64_t *nshared) | |
165 | { | |
611e0653 WG |
166 | *nperm = BLK_PERM_CONSISTENT_READ; |
167 | if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { | |
168 | *nperm |= BLK_PERM_WRITE; | |
169 | } | |
170 | *nshared = BLK_PERM_CONSISTENT_READ \ | |
171 | | BLK_PERM_WRITE \ | |
172 | | BLK_PERM_WRITE_UNCHANGED; | |
37a9051c CX |
173 | return; |
174 | } | |
175 | ||
29ff7890 WC |
176 | static int64_t replication_getlength(BlockDriverState *bs) |
177 | { | |
178 | return bdrv_getlength(bs->file->bs); | |
179 | } | |
180 | ||
181 | static int replication_get_io_status(BDRVReplicationState *s) | |
182 | { | |
3c76c606 | 183 | switch (s->stage) { |
29ff7890 WC |
184 | case BLOCK_REPLICATION_NONE: |
185 | return -EIO; | |
186 | case BLOCK_REPLICATION_RUNNING: | |
187 | return 0; | |
188 | case BLOCK_REPLICATION_FAILOVER: | |
189 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; | |
190 | case BLOCK_REPLICATION_FAILOVER_FAILED: | |
191 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; | |
192 | case BLOCK_REPLICATION_DONE: | |
193 | /* | |
194 | * active commit job completes, and active disk and secondary_disk | |
195 | * is swapped, so we can operate bs->file directly | |
196 | */ | |
197 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; | |
198 | default: | |
199 | abort(); | |
200 | } | |
201 | } | |
202 | ||
203 | static int replication_return_value(BDRVReplicationState *s, int ret) | |
204 | { | |
205 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
206 | return ret; | |
207 | } | |
208 | ||
209 | if (ret < 0) { | |
210 | s->error = ret; | |
211 | ret = 0; | |
212 | } | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | static coroutine_fn int replication_co_readv(BlockDriverState *bs, | |
218 | int64_t sector_num, | |
219 | int remaining_sectors, | |
220 | QEMUIOVector *qiov) | |
221 | { | |
222 | BDRVReplicationState *s = bs->opaque; | |
29ff7890 WC |
223 | int ret; |
224 | ||
225 | if (s->mode == REPLICATION_MODE_PRIMARY) { | |
226 | /* We only use it to forward primary write requests */ | |
227 | return -EIO; | |
228 | } | |
229 | ||
230 | ret = replication_get_io_status(s); | |
231 | if (ret < 0) { | |
232 | return ret; | |
233 | } | |
234 | ||
04a11d87 EB |
235 | ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, |
236 | remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); | |
e4f9752c | 237 | |
29ff7890 WC |
238 | return replication_return_value(s, ret); |
239 | } | |
240 | ||
241 | static coroutine_fn int replication_co_writev(BlockDriverState *bs, | |
242 | int64_t sector_num, | |
243 | int remaining_sectors, | |
e18a58b4 EB |
244 | QEMUIOVector *qiov, |
245 | int flags) | |
29ff7890 WC |
246 | { |
247 | BDRVReplicationState *s = bs->opaque; | |
248 | QEMUIOVector hd_qiov; | |
249 | uint64_t bytes_done = 0; | |
250 | BdrvChild *top = bs->file; | |
251 | BdrvChild *base = s->secondary_disk; | |
252 | BdrvChild *target; | |
51b0a488 EB |
253 | int ret; |
254 | int64_t n; | |
29ff7890 | 255 | |
e18a58b4 | 256 | assert(!flags); |
29ff7890 WC |
257 | ret = replication_get_io_status(s); |
258 | if (ret < 0) { | |
259 | goto out; | |
260 | } | |
261 | ||
262 | if (ret == 0) { | |
04a11d87 EB |
263 | ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, |
264 | remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); | |
29ff7890 WC |
265 | return replication_return_value(s, ret); |
266 | } | |
267 | ||
268 | /* | |
269 | * Failover failed, only write to active disk if the sectors | |
270 | * have already been allocated in active disk/hidden disk. | |
271 | */ | |
272 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
273 | while (remaining_sectors > 0) { | |
51b0a488 EB |
274 | int64_t count; |
275 | ||
276 | ret = bdrv_is_allocated_above(top->bs, base->bs, | |
277 | sector_num * BDRV_SECTOR_SIZE, | |
278 | remaining_sectors * BDRV_SECTOR_SIZE, | |
279 | &count); | |
29ff7890 WC |
280 | if (ret < 0) { |
281 | goto out1; | |
282 | } | |
283 | ||
51b0a488 EB |
284 | assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); |
285 | n = count >> BDRV_SECTOR_BITS; | |
29ff7890 | 286 | qemu_iovec_reset(&hd_qiov); |
51b0a488 | 287 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); |
29ff7890 WC |
288 | |
289 | target = ret ? top : base; | |
04a11d87 EB |
290 | ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, |
291 | n * BDRV_SECTOR_SIZE, &hd_qiov, 0); | |
29ff7890 WC |
292 | if (ret < 0) { |
293 | goto out1; | |
294 | } | |
295 | ||
296 | remaining_sectors -= n; | |
297 | sector_num += n; | |
51b0a488 | 298 | bytes_done += count; |
29ff7890 WC |
299 | } |
300 | ||
301 | out1: | |
302 | qemu_iovec_destroy(&hd_qiov); | |
303 | out: | |
304 | return ret; | |
305 | } | |
306 | ||
307 | static bool replication_recurse_is_first_non_filter(BlockDriverState *bs, | |
308 | BlockDriverState *candidate) | |
309 | { | |
310 | return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate); | |
311 | } | |
312 | ||
313 | static void secondary_do_checkpoint(BDRVReplicationState *s, Error **errp) | |
314 | { | |
315 | Error *local_err = NULL; | |
316 | int ret; | |
317 | ||
318 | if (!s->secondary_disk->bs->job) { | |
319 | error_setg(errp, "Backup job was cancelled unexpectedly"); | |
320 | return; | |
321 | } | |
322 | ||
323 | backup_do_checkpoint(s->secondary_disk->bs->job, &local_err); | |
324 | if (local_err) { | |
325 | error_propagate(errp, local_err); | |
326 | return; | |
327 | } | |
328 | ||
d470ad42 HR |
329 | if (!s->active_disk->bs->drv) { |
330 | error_setg(errp, "Active disk %s is ejected", | |
331 | s->active_disk->bs->node_name); | |
332 | return; | |
333 | } | |
334 | ||
29ff7890 WC |
335 | ret = s->active_disk->bs->drv->bdrv_make_empty(s->active_disk->bs); |
336 | if (ret < 0) { | |
337 | error_setg(errp, "Cannot make active disk empty"); | |
338 | return; | |
339 | } | |
340 | ||
d470ad42 HR |
341 | if (!s->hidden_disk->bs->drv) { |
342 | error_setg(errp, "Hidden disk %s is ejected", | |
343 | s->hidden_disk->bs->node_name); | |
344 | return; | |
345 | } | |
346 | ||
29ff7890 WC |
347 | ret = s->hidden_disk->bs->drv->bdrv_make_empty(s->hidden_disk->bs); |
348 | if (ret < 0) { | |
349 | error_setg(errp, "Cannot make hidden disk empty"); | |
350 | return; | |
351 | } | |
352 | } | |
353 | ||
3c4e9647 AG |
354 | /* This function is supposed to be called twice: |
355 | * first with writable = true, then with writable = false. | |
356 | * The first call puts s->hidden_disk and s->secondary_disk in | |
357 | * r/w mode, and the second puts them back in their original state. | |
358 | */ | |
8dd9006e | 359 | static void reopen_backing_file(BlockDriverState *bs, bool writable, |
29ff7890 WC |
360 | Error **errp) |
361 | { | |
8dd9006e | 362 | BDRVReplicationState *s = bs->opaque; |
29ff7890 | 363 | BlockReopenQueue *reopen_queue = NULL; |
29ff7890 WC |
364 | Error *local_err = NULL; |
365 | ||
366 | if (writable) { | |
3c4e9647 AG |
367 | s->orig_hidden_read_only = bdrv_is_read_only(s->hidden_disk->bs); |
368 | s->orig_secondary_read_only = bdrv_is_read_only(s->secondary_disk->bs); | |
29ff7890 WC |
369 | } |
370 | ||
1a63a907 KW |
371 | bdrv_subtree_drained_begin(s->hidden_disk->bs); |
372 | bdrv_subtree_drained_begin(s->secondary_disk->bs); | |
373 | ||
3c4e9647 | 374 | if (s->orig_hidden_read_only) { |
3c4e9647 AG |
375 | QDict *opts = qdict_new(); |
376 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); | |
377 | reopen_queue = bdrv_reopen_queue(reopen_queue, s->hidden_disk->bs, | |
077e8e20 | 378 | opts, true); |
29ff7890 WC |
379 | } |
380 | ||
3c4e9647 | 381 | if (s->orig_secondary_read_only) { |
3c4e9647 AG |
382 | QDict *opts = qdict_new(); |
383 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); | |
29ff7890 | 384 | reopen_queue = bdrv_reopen_queue(reopen_queue, s->secondary_disk->bs, |
077e8e20 | 385 | opts, true); |
29ff7890 WC |
386 | } |
387 | ||
388 | if (reopen_queue) { | |
5019aece | 389 | bdrv_reopen_multiple(reopen_queue, &local_err); |
29ff7890 WC |
390 | error_propagate(errp, local_err); |
391 | } | |
1a63a907 KW |
392 | |
393 | bdrv_subtree_drained_end(s->hidden_disk->bs); | |
394 | bdrv_subtree_drained_end(s->secondary_disk->bs); | |
29ff7890 WC |
395 | } |
396 | ||
8dd9006e | 397 | static void backup_job_cleanup(BlockDriverState *bs) |
29ff7890 | 398 | { |
8dd9006e | 399 | BDRVReplicationState *s = bs->opaque; |
29ff7890 WC |
400 | BlockDriverState *top_bs; |
401 | ||
402 | top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); | |
403 | if (!top_bs) { | |
404 | return; | |
405 | } | |
406 | bdrv_op_unblock_all(top_bs, s->blocker); | |
407 | error_free(s->blocker); | |
8dd9006e | 408 | reopen_backing_file(bs, false, NULL); |
29ff7890 WC |
409 | } |
410 | ||
411 | static void backup_job_completed(void *opaque, int ret) | |
412 | { | |
8dd9006e PB |
413 | BlockDriverState *bs = opaque; |
414 | BDRVReplicationState *s = bs->opaque; | |
29ff7890 | 415 | |
3c76c606 | 416 | if (s->stage != BLOCK_REPLICATION_FAILOVER) { |
29ff7890 WC |
417 | /* The backup job is cancelled unexpectedly */ |
418 | s->error = -EIO; | |
419 | } | |
420 | ||
8dd9006e | 421 | backup_job_cleanup(bs); |
29ff7890 WC |
422 | } |
423 | ||
424 | static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) | |
425 | { | |
426 | BdrvChild *child; | |
427 | ||
428 | /* The bs itself is the top_bs */ | |
429 | if (top_bs == bs) { | |
430 | return true; | |
431 | } | |
432 | ||
433 | /* Iterate over top_bs's children */ | |
434 | QLIST_FOREACH(child, &top_bs->children, next) { | |
435 | if (child->bs == bs || check_top_bs(child->bs, bs)) { | |
436 | return true; | |
437 | } | |
438 | } | |
439 | ||
440 | return false; | |
441 | } | |
442 | ||
443 | static void replication_start(ReplicationState *rs, ReplicationMode mode, | |
444 | Error **errp) | |
445 | { | |
446 | BlockDriverState *bs = rs->opaque; | |
447 | BDRVReplicationState *s; | |
448 | BlockDriverState *top_bs; | |
449 | int64_t active_length, hidden_length, disk_length; | |
450 | AioContext *aio_context; | |
451 | Error *local_err = NULL; | |
111049a4 | 452 | BlockJob *job; |
29ff7890 WC |
453 | |
454 | aio_context = bdrv_get_aio_context(bs); | |
455 | aio_context_acquire(aio_context); | |
456 | s = bs->opaque; | |
457 | ||
3c76c606 | 458 | if (s->stage != BLOCK_REPLICATION_NONE) { |
29ff7890 WC |
459 | error_setg(errp, "Block replication is running or done"); |
460 | aio_context_release(aio_context); | |
461 | return; | |
462 | } | |
463 | ||
464 | if (s->mode != mode) { | |
465 | error_setg(errp, "The parameter mode's value is invalid, needs %d," | |
466 | " but got %d", s->mode, mode); | |
467 | aio_context_release(aio_context); | |
468 | return; | |
469 | } | |
470 | ||
471 | switch (s->mode) { | |
472 | case REPLICATION_MODE_PRIMARY: | |
473 | break; | |
474 | case REPLICATION_MODE_SECONDARY: | |
475 | s->active_disk = bs->file; | |
476 | if (!s->active_disk || !s->active_disk->bs || | |
477 | !s->active_disk->bs->backing) { | |
478 | error_setg(errp, "Active disk doesn't have backing file"); | |
479 | aio_context_release(aio_context); | |
480 | return; | |
481 | } | |
482 | ||
483 | s->hidden_disk = s->active_disk->bs->backing; | |
484 | if (!s->hidden_disk->bs || !s->hidden_disk->bs->backing) { | |
485 | error_setg(errp, "Hidden disk doesn't have backing file"); | |
486 | aio_context_release(aio_context); | |
487 | return; | |
488 | } | |
489 | ||
490 | s->secondary_disk = s->hidden_disk->bs->backing; | |
491 | if (!s->secondary_disk->bs || !bdrv_has_blk(s->secondary_disk->bs)) { | |
492 | error_setg(errp, "The secondary disk doesn't have block backend"); | |
493 | aio_context_release(aio_context); | |
494 | return; | |
495 | } | |
496 | ||
497 | /* verify the length */ | |
498 | active_length = bdrv_getlength(s->active_disk->bs); | |
499 | hidden_length = bdrv_getlength(s->hidden_disk->bs); | |
500 | disk_length = bdrv_getlength(s->secondary_disk->bs); | |
501 | if (active_length < 0 || hidden_length < 0 || disk_length < 0 || | |
502 | active_length != hidden_length || hidden_length != disk_length) { | |
503 | error_setg(errp, "Active disk, hidden disk, secondary disk's length" | |
504 | " are not the same"); | |
505 | aio_context_release(aio_context); | |
506 | return; | |
507 | } | |
508 | ||
d470ad42 HR |
509 | /* Must be true, or the bdrv_getlength() calls would have failed */ |
510 | assert(s->active_disk->bs->drv && s->hidden_disk->bs->drv); | |
511 | ||
29ff7890 WC |
512 | if (!s->active_disk->bs->drv->bdrv_make_empty || |
513 | !s->hidden_disk->bs->drv->bdrv_make_empty) { | |
514 | error_setg(errp, | |
515 | "Active disk or hidden disk doesn't support make_empty"); | |
516 | aio_context_release(aio_context); | |
517 | return; | |
518 | } | |
519 | ||
520 | /* reopen the backing file in r/w mode */ | |
8dd9006e | 521 | reopen_backing_file(bs, true, &local_err); |
29ff7890 WC |
522 | if (local_err) { |
523 | error_propagate(errp, local_err); | |
524 | aio_context_release(aio_context); | |
525 | return; | |
526 | } | |
527 | ||
528 | /* start backup job now */ | |
529 | error_setg(&s->blocker, | |
530 | "Block device is in use by internal backup job"); | |
531 | ||
532 | top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); | |
533 | if (!top_bs || !bdrv_is_root_node(top_bs) || | |
534 | !check_top_bs(top_bs, bs)) { | |
535 | error_setg(errp, "No top_bs or it is invalid"); | |
8dd9006e | 536 | reopen_backing_file(bs, false, NULL); |
29ff7890 WC |
537 | aio_context_release(aio_context); |
538 | return; | |
539 | } | |
540 | bdrv_op_block_all(top_bs, s->blocker); | |
541 | bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); | |
542 | ||
111049a4 JS |
543 | job = backup_job_create(NULL, s->secondary_disk->bs, s->hidden_disk->bs, |
544 | 0, MIRROR_SYNC_MODE_NONE, NULL, false, | |
545 | BLOCKDEV_ON_ERROR_REPORT, | |
bb02b65c | 546 | BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, |
111049a4 | 547 | backup_job_completed, bs, NULL, &local_err); |
29ff7890 WC |
548 | if (local_err) { |
549 | error_propagate(errp, local_err); | |
8dd9006e | 550 | backup_job_cleanup(bs); |
29ff7890 WC |
551 | aio_context_release(aio_context); |
552 | return; | |
553 | } | |
da01ff7f | 554 | job_start(&job->job); |
29ff7890 WC |
555 | break; |
556 | default: | |
557 | aio_context_release(aio_context); | |
558 | abort(); | |
559 | } | |
560 | ||
3c76c606 | 561 | s->stage = BLOCK_REPLICATION_RUNNING; |
29ff7890 WC |
562 | |
563 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
564 | secondary_do_checkpoint(s, errp); | |
565 | } | |
566 | ||
567 | s->error = 0; | |
568 | aio_context_release(aio_context); | |
569 | } | |
570 | ||
571 | static void replication_do_checkpoint(ReplicationState *rs, Error **errp) | |
572 | { | |
573 | BlockDriverState *bs = rs->opaque; | |
574 | BDRVReplicationState *s; | |
575 | AioContext *aio_context; | |
576 | ||
577 | aio_context = bdrv_get_aio_context(bs); | |
578 | aio_context_acquire(aio_context); | |
579 | s = bs->opaque; | |
580 | ||
581 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
582 | secondary_do_checkpoint(s, errp); | |
583 | } | |
584 | aio_context_release(aio_context); | |
585 | } | |
586 | ||
587 | static void replication_get_error(ReplicationState *rs, Error **errp) | |
588 | { | |
589 | BlockDriverState *bs = rs->opaque; | |
590 | BDRVReplicationState *s; | |
591 | AioContext *aio_context; | |
592 | ||
593 | aio_context = bdrv_get_aio_context(bs); | |
594 | aio_context_acquire(aio_context); | |
595 | s = bs->opaque; | |
596 | ||
3c76c606 | 597 | if (s->stage != BLOCK_REPLICATION_RUNNING) { |
29ff7890 WC |
598 | error_setg(errp, "Block replication is not running"); |
599 | aio_context_release(aio_context); | |
600 | return; | |
601 | } | |
602 | ||
603 | if (s->error) { | |
604 | error_setg(errp, "I/O error occurred"); | |
605 | aio_context_release(aio_context); | |
606 | return; | |
607 | } | |
608 | aio_context_release(aio_context); | |
609 | } | |
610 | ||
611 | static void replication_done(void *opaque, int ret) | |
612 | { | |
613 | BlockDriverState *bs = opaque; | |
614 | BDRVReplicationState *s = bs->opaque; | |
615 | ||
616 | if (ret == 0) { | |
3c76c606 | 617 | s->stage = BLOCK_REPLICATION_DONE; |
29ff7890 | 618 | |
29ff7890 WC |
619 | s->active_disk = NULL; |
620 | s->secondary_disk = NULL; | |
621 | s->hidden_disk = NULL; | |
622 | s->error = 0; | |
623 | } else { | |
3c76c606 | 624 | s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; |
29ff7890 WC |
625 | s->error = -EIO; |
626 | } | |
627 | } | |
628 | ||
629 | static void replication_stop(ReplicationState *rs, bool failover, Error **errp) | |
630 | { | |
631 | BlockDriverState *bs = rs->opaque; | |
632 | BDRVReplicationState *s; | |
633 | AioContext *aio_context; | |
634 | ||
635 | aio_context = bdrv_get_aio_context(bs); | |
636 | aio_context_acquire(aio_context); | |
637 | s = bs->opaque; | |
638 | ||
3c76c606 | 639 | if (s->stage != BLOCK_REPLICATION_RUNNING) { |
29ff7890 WC |
640 | error_setg(errp, "Block replication is not running"); |
641 | aio_context_release(aio_context); | |
642 | return; | |
643 | } | |
644 | ||
645 | switch (s->mode) { | |
646 | case REPLICATION_MODE_PRIMARY: | |
3c76c606 | 647 | s->stage = BLOCK_REPLICATION_DONE; |
29ff7890 WC |
648 | s->error = 0; |
649 | break; | |
650 | case REPLICATION_MODE_SECONDARY: | |
651 | /* | |
652 | * This BDS will be closed, and the job should be completed | |
653 | * before the BDS is closed, because we will access hidden | |
654 | * disk, secondary disk in backup_job_completed(). | |
655 | */ | |
656 | if (s->secondary_disk->bs->job) { | |
3d70ff53 | 657 | job_cancel_sync(&s->secondary_disk->bs->job->job); |
29ff7890 WC |
658 | } |
659 | ||
660 | if (!failover) { | |
661 | secondary_do_checkpoint(s, errp); | |
3c76c606 | 662 | s->stage = BLOCK_REPLICATION_DONE; |
29ff7890 WC |
663 | aio_context_release(aio_context); |
664 | return; | |
665 | } | |
666 | ||
3c76c606 | 667 | s->stage = BLOCK_REPLICATION_FAILOVER; |
47970dfb | 668 | commit_active_start(NULL, s->active_disk->bs, s->secondary_disk->bs, |
bb02b65c | 669 | JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, |
78bbd910 | 670 | NULL, replication_done, bs, true, errp); |
29ff7890 WC |
671 | break; |
672 | default: | |
673 | aio_context_release(aio_context); | |
674 | abort(); | |
675 | } | |
676 | aio_context_release(aio_context); | |
677 | } | |
678 | ||
2654267c HR |
679 | static const char *const replication_strong_runtime_opts[] = { |
680 | REPLICATION_MODE, | |
681 | REPLICATION_TOP_ID, | |
682 | ||
683 | NULL | |
684 | }; | |
685 | ||
782b9d06 | 686 | static BlockDriver bdrv_replication = { |
29ff7890 | 687 | .format_name = "replication", |
29ff7890 WC |
688 | .instance_size = sizeof(BDRVReplicationState), |
689 | ||
690 | .bdrv_open = replication_open, | |
691 | .bdrv_close = replication_close, | |
37a9051c | 692 | .bdrv_child_perm = replication_child_perm, |
29ff7890 WC |
693 | |
694 | .bdrv_getlength = replication_getlength, | |
695 | .bdrv_co_readv = replication_co_readv, | |
696 | .bdrv_co_writev = replication_co_writev, | |
697 | ||
698 | .is_filter = true, | |
699 | .bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter, | |
700 | ||
701 | .has_variable_length = true, | |
2654267c | 702 | .strong_runtime_opts = replication_strong_runtime_opts, |
29ff7890 WC |
703 | }; |
704 | ||
705 | static void bdrv_replication_init(void) | |
706 | { | |
707 | bdrv_register(&bdrv_replication); | |
708 | } | |
709 | ||
710 | block_init(bdrv_replication_init); |