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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" |
b0262955 | 25 | #include "block/replication.h" |
29ff7890 | 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; |
cc19f177 | 38 | BlockJob *commit_job; |
29ff7890 WC |
39 | BdrvChild *hidden_disk; |
40 | BdrvChild *secondary_disk; | |
cc19f177 | 41 | BlockJob *backup_job; |
29ff7890 WC |
42 | char *top_id; |
43 | ReplicationState *rs; | |
44 | Error *blocker; | |
3c4e9647 AG |
45 | bool orig_hidden_read_only; |
46 | bool orig_secondary_read_only; | |
29ff7890 WC |
47 | int error; |
48 | } BDRVReplicationState; | |
49 | ||
29ff7890 WC |
50 | static void replication_start(ReplicationState *rs, ReplicationMode mode, |
51 | Error **errp); | |
52 | static void replication_do_checkpoint(ReplicationState *rs, Error **errp); | |
53 | static void replication_get_error(ReplicationState *rs, Error **errp); | |
54 | static void replication_stop(ReplicationState *rs, bool failover, | |
55 | Error **errp); | |
56 | ||
57 | #define REPLICATION_MODE "mode" | |
58 | #define REPLICATION_TOP_ID "top-id" | |
59 | static QemuOptsList replication_runtime_opts = { | |
60 | .name = "replication", | |
61 | .head = QTAILQ_HEAD_INITIALIZER(replication_runtime_opts.head), | |
62 | .desc = { | |
63 | { | |
64 | .name = REPLICATION_MODE, | |
65 | .type = QEMU_OPT_STRING, | |
66 | }, | |
67 | { | |
68 | .name = REPLICATION_TOP_ID, | |
69 | .type = QEMU_OPT_STRING, | |
70 | }, | |
71 | { /* end of list */ } | |
72 | }, | |
73 | }; | |
74 | ||
75 | static ReplicationOps replication_ops = { | |
76 | .start = replication_start, | |
77 | .checkpoint = replication_do_checkpoint, | |
78 | .get_error = replication_get_error, | |
79 | .stop = replication_stop, | |
80 | }; | |
81 | ||
82 | static int replication_open(BlockDriverState *bs, QDict *options, | |
83 | int flags, Error **errp) | |
84 | { | |
85 | int ret; | |
86 | BDRVReplicationState *s = bs->opaque; | |
29ff7890 WC |
87 | QemuOpts *opts = NULL; |
88 | const char *mode; | |
89 | const char *top_id; | |
90 | ||
83930780 VSO |
91 | ret = bdrv_open_file_child(NULL, options, "file", bs, errp); |
92 | if (ret < 0) { | |
93 | return ret; | |
4e4bf5c4 KW |
94 | } |
95 | ||
29ff7890 WC |
96 | ret = -EINVAL; |
97 | opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort); | |
a5f9b9df | 98 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
29ff7890 WC |
99 | goto fail; |
100 | } | |
101 | ||
102 | mode = qemu_opt_get(opts, REPLICATION_MODE); | |
103 | if (!mode) { | |
dcfe4805 | 104 | error_setg(errp, "Missing the option mode"); |
29ff7890 WC |
105 | goto fail; |
106 | } | |
107 | ||
108 | if (!strcmp(mode, "primary")) { | |
109 | s->mode = REPLICATION_MODE_PRIMARY; | |
f4f2539b CX |
110 | top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); |
111 | if (top_id) { | |
dcfe4805 MA |
112 | error_setg(errp, |
113 | "The primary side does not support option top-id"); | |
f4f2539b CX |
114 | goto fail; |
115 | } | |
29ff7890 WC |
116 | } else if (!strcmp(mode, "secondary")) { |
117 | s->mode = REPLICATION_MODE_SECONDARY; | |
118 | top_id = qemu_opt_get(opts, REPLICATION_TOP_ID); | |
119 | s->top_id = g_strdup(top_id); | |
120 | if (!s->top_id) { | |
dcfe4805 | 121 | error_setg(errp, "Missing the option top-id"); |
29ff7890 WC |
122 | goto fail; |
123 | } | |
124 | } else { | |
dcfe4805 | 125 | error_setg(errp, |
29ff7890 WC |
126 | "The option mode's value should be primary or secondary"); |
127 | goto fail; | |
128 | } | |
129 | ||
130 | s->rs = replication_new(bs, &replication_ops); | |
131 | ||
132 | ret = 0; | |
133 | ||
134 | fail: | |
135 | qemu_opts_del(opts); | |
29ff7890 WC |
136 | return ret; |
137 | } | |
138 | ||
139 | static void replication_close(BlockDriverState *bs) | |
140 | { | |
141 | BDRVReplicationState *s = bs->opaque; | |
08558e33 | 142 | Job *commit_job; |
3ed4f708 | 143 | GLOBAL_STATE_CODE(); |
29ff7890 | 144 | |
3c76c606 | 145 | if (s->stage == BLOCK_REPLICATION_RUNNING) { |
29ff7890 WC |
146 | replication_stop(s->rs, false, NULL); |
147 | } | |
3c76c606 | 148 | if (s->stage == BLOCK_REPLICATION_FAILOVER) { |
08558e33 SR |
149 | commit_job = &s->commit_job->job; |
150 | assert(commit_job->aio_context == qemu_get_current_aio_context()); | |
4cfb3f05 | 151 | job_cancel_sync(commit_job, false); |
50ab0e09 | 152 | } |
29ff7890 WC |
153 | |
154 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
155 | g_free(s->top_id); | |
156 | } | |
157 | ||
158 | replication_remove(s->rs); | |
159 | } | |
160 | ||
37a9051c | 161 | static void replication_child_perm(BlockDriverState *bs, BdrvChild *c, |
bf8e925e | 162 | BdrvChildRole role, |
e0995dc3 | 163 | BlockReopenQueue *reopen_queue, |
37a9051c CX |
164 | uint64_t perm, uint64_t shared, |
165 | uint64_t *nperm, uint64_t *nshared) | |
166 | { | |
3b78420b LS |
167 | if (role & BDRV_CHILD_PRIMARY) { |
168 | *nperm = BLK_PERM_CONSISTENT_READ; | |
169 | } else { | |
170 | *nperm = 0; | |
171 | } | |
172 | ||
611e0653 WG |
173 | if ((bs->open_flags & (BDRV_O_INACTIVE | BDRV_O_RDWR)) == BDRV_O_RDWR) { |
174 | *nperm |= BLK_PERM_WRITE; | |
175 | } | |
78ee6bd0 PMD |
176 | *nshared = BLK_PERM_CONSISTENT_READ |
177 | | BLK_PERM_WRITE | |
611e0653 | 178 | | BLK_PERM_WRITE_UNCHANGED; |
37a9051c CX |
179 | return; |
180 | } | |
181 | ||
8ab8140a KW |
182 | static int64_t coroutine_fn GRAPH_RDLOCK |
183 | replication_co_getlength(BlockDriverState *bs) | |
29ff7890 | 184 | { |
c86422c5 | 185 | return bdrv_co_getlength(bs->file->bs); |
29ff7890 WC |
186 | } |
187 | ||
188 | static int replication_get_io_status(BDRVReplicationState *s) | |
189 | { | |
3c76c606 | 190 | switch (s->stage) { |
29ff7890 WC |
191 | case BLOCK_REPLICATION_NONE: |
192 | return -EIO; | |
193 | case BLOCK_REPLICATION_RUNNING: | |
194 | return 0; | |
195 | case BLOCK_REPLICATION_FAILOVER: | |
196 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; | |
197 | case BLOCK_REPLICATION_FAILOVER_FAILED: | |
198 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 1; | |
199 | case BLOCK_REPLICATION_DONE: | |
200 | /* | |
201 | * active commit job completes, and active disk and secondary_disk | |
202 | * is swapped, so we can operate bs->file directly | |
203 | */ | |
204 | return s->mode == REPLICATION_MODE_PRIMARY ? -EIO : 0; | |
205 | default: | |
206 | abort(); | |
207 | } | |
208 | } | |
209 | ||
210 | static int replication_return_value(BDRVReplicationState *s, int ret) | |
211 | { | |
212 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
213 | return ret; | |
214 | } | |
215 | ||
216 | if (ret < 0) { | |
217 | s->error = ret; | |
218 | ret = 0; | |
219 | } | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
b9b10c35 KW |
224 | static int coroutine_fn GRAPH_RDLOCK |
225 | replication_co_readv(BlockDriverState *bs, int64_t sector_num, | |
226 | int remaining_sectors, QEMUIOVector *qiov) | |
29ff7890 WC |
227 | { |
228 | BDRVReplicationState *s = bs->opaque; | |
29ff7890 WC |
229 | int ret; |
230 | ||
231 | if (s->mode == REPLICATION_MODE_PRIMARY) { | |
232 | /* We only use it to forward primary write requests */ | |
233 | return -EIO; | |
234 | } | |
235 | ||
236 | ret = replication_get_io_status(s); | |
237 | if (ret < 0) { | |
238 | return ret; | |
239 | } | |
240 | ||
04a11d87 EB |
241 | ret = bdrv_co_preadv(bs->file, sector_num * BDRV_SECTOR_SIZE, |
242 | remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); | |
e4f9752c | 243 | |
29ff7890 WC |
244 | return replication_return_value(s, ret); |
245 | } | |
246 | ||
b9b10c35 KW |
247 | static int coroutine_fn GRAPH_RDLOCK |
248 | replication_co_writev(BlockDriverState *bs, int64_t sector_num, | |
249 | int remaining_sectors, QEMUIOVector *qiov, int flags) | |
29ff7890 WC |
250 | { |
251 | BDRVReplicationState *s = bs->opaque; | |
252 | QEMUIOVector hd_qiov; | |
253 | uint64_t bytes_done = 0; | |
254 | BdrvChild *top = bs->file; | |
255 | BdrvChild *base = s->secondary_disk; | |
256 | BdrvChild *target; | |
51b0a488 EB |
257 | int ret; |
258 | int64_t n; | |
29ff7890 WC |
259 | |
260 | ret = replication_get_io_status(s); | |
261 | if (ret < 0) { | |
262 | goto out; | |
263 | } | |
264 | ||
265 | if (ret == 0) { | |
04a11d87 EB |
266 | ret = bdrv_co_pwritev(top, sector_num * BDRV_SECTOR_SIZE, |
267 | remaining_sectors * BDRV_SECTOR_SIZE, qiov, 0); | |
29ff7890 WC |
268 | return replication_return_value(s, ret); |
269 | } | |
270 | ||
271 | /* | |
272 | * Failover failed, only write to active disk if the sectors | |
273 | * have already been allocated in active disk/hidden disk. | |
274 | */ | |
275 | qemu_iovec_init(&hd_qiov, qiov->niov); | |
276 | while (remaining_sectors > 0) { | |
51b0a488 EB |
277 | int64_t count; |
278 | ||
cc323997 PB |
279 | ret = bdrv_co_is_allocated_above(top->bs, base->bs, false, |
280 | sector_num * BDRV_SECTOR_SIZE, | |
281 | remaining_sectors * BDRV_SECTOR_SIZE, | |
282 | &count); | |
29ff7890 WC |
283 | if (ret < 0) { |
284 | goto out1; | |
285 | } | |
286 | ||
51b0a488 EB |
287 | assert(QEMU_IS_ALIGNED(count, BDRV_SECTOR_SIZE)); |
288 | n = count >> BDRV_SECTOR_BITS; | |
29ff7890 | 289 | qemu_iovec_reset(&hd_qiov); |
51b0a488 | 290 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, count); |
29ff7890 WC |
291 | |
292 | target = ret ? top : base; | |
04a11d87 EB |
293 | ret = bdrv_co_pwritev(target, sector_num * BDRV_SECTOR_SIZE, |
294 | n * BDRV_SECTOR_SIZE, &hd_qiov, 0); | |
29ff7890 WC |
295 | if (ret < 0) { |
296 | goto out1; | |
297 | } | |
298 | ||
299 | remaining_sectors -= n; | |
300 | sector_num += n; | |
51b0a488 | 301 | bytes_done += count; |
29ff7890 WC |
302 | } |
303 | ||
304 | out1: | |
305 | qemu_iovec_destroy(&hd_qiov); | |
306 | out: | |
307 | return ret; | |
308 | } | |
309 | ||
0bb79c97 KW |
310 | static void GRAPH_UNLOCKED |
311 | secondary_do_checkpoint(BlockDriverState *bs, Error **errp) | |
29ff7890 | 312 | { |
1e12ecfd | 313 | BDRVReplicationState *s = bs->opaque; |
1f051dcb | 314 | BdrvChild *active_disk; |
29ff7890 WC |
315 | Error *local_err = NULL; |
316 | int ret; | |
317 | ||
0bb79c97 KW |
318 | GRAPH_RDLOCK_GUARD_MAINLOOP(); |
319 | ||
cc19f177 | 320 | if (!s->backup_job) { |
29ff7890 WC |
321 | error_setg(errp, "Backup job was cancelled unexpectedly"); |
322 | return; | |
323 | } | |
324 | ||
cc19f177 | 325 | backup_do_checkpoint(s->backup_job, &local_err); |
29ff7890 WC |
326 | if (local_err) { |
327 | error_propagate(errp, local_err); | |
328 | return; | |
329 | } | |
330 | ||
1f051dcb | 331 | active_disk = bs->file; |
1e12ecfd | 332 | if (!active_disk->bs->drv) { |
d470ad42 | 333 | error_setg(errp, "Active disk %s is ejected", |
1e12ecfd | 334 | active_disk->bs->node_name); |
d470ad42 HR |
335 | return; |
336 | } | |
337 | ||
1e12ecfd | 338 | ret = bdrv_make_empty(active_disk, errp); |
29ff7890 | 339 | if (ret < 0) { |
29ff7890 WC |
340 | return; |
341 | } | |
342 | ||
d470ad42 HR |
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 | ||
c2cf0eca | 349 | ret = bdrv_make_empty(s->hidden_disk, errp); |
29ff7890 | 350 | if (ret < 0) { |
29ff7890 WC |
351 | return; |
352 | } | |
353 | } | |
354 | ||
3c4e9647 AG |
355 | /* This function is supposed to be called twice: |
356 | * first with writable = true, then with writable = false. | |
357 | * The first call puts s->hidden_disk and s->secondary_disk in | |
358 | * r/w mode, and the second puts them back in their original state. | |
359 | */ | |
8dd9006e | 360 | static void reopen_backing_file(BlockDriverState *bs, bool writable, |
29ff7890 WC |
361 | Error **errp) |
362 | { | |
8dd9006e | 363 | BDRVReplicationState *s = bs->opaque; |
a990a42b | 364 | BdrvChild *hidden_disk, *secondary_disk; |
29ff7890 | 365 | BlockReopenQueue *reopen_queue = NULL; |
29ff7890 | 366 | |
004915a9 KW |
367 | GLOBAL_STATE_CODE(); |
368 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
369 | ||
a990a42b LS |
370 | /* |
371 | * s->hidden_disk and s->secondary_disk may not be set yet, as they will | |
372 | * only be set after the children are writable. | |
373 | */ | |
374 | hidden_disk = bs->file->bs->backing; | |
375 | secondary_disk = hidden_disk->bs->backing; | |
376 | ||
29ff7890 | 377 | if (writable) { |
a990a42b LS |
378 | s->orig_hidden_read_only = bdrv_is_read_only(hidden_disk->bs); |
379 | s->orig_secondary_read_only = bdrv_is_read_only(secondary_disk->bs); | |
29ff7890 WC |
380 | } |
381 | ||
3c4e9647 | 382 | if (s->orig_hidden_read_only) { |
3c4e9647 AG |
383 | QDict *opts = qdict_new(); |
384 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); | |
a990a42b | 385 | reopen_queue = bdrv_reopen_queue(reopen_queue, hidden_disk->bs, |
077e8e20 | 386 | opts, true); |
29ff7890 WC |
387 | } |
388 | ||
3c4e9647 | 389 | if (s->orig_secondary_read_only) { |
3c4e9647 AG |
390 | QDict *opts = qdict_new(); |
391 | qdict_put_bool(opts, BDRV_OPT_READ_ONLY, !writable); | |
a990a42b | 392 | reopen_queue = bdrv_reopen_queue(reopen_queue, secondary_disk->bs, |
077e8e20 | 393 | opts, true); |
29ff7890 WC |
394 | } |
395 | ||
396 | if (reopen_queue) { | |
992861fb | 397 | bdrv_reopen_multiple(reopen_queue, errp); |
29ff7890 WC |
398 | } |
399 | } | |
400 | ||
8dd9006e | 401 | static void backup_job_cleanup(BlockDriverState *bs) |
29ff7890 | 402 | { |
8dd9006e | 403 | BDRVReplicationState *s = bs->opaque; |
29ff7890 WC |
404 | BlockDriverState *top_bs; |
405 | ||
e140f4b7 LS |
406 | s->backup_job = NULL; |
407 | ||
29ff7890 WC |
408 | top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); |
409 | if (!top_bs) { | |
410 | return; | |
411 | } | |
412 | bdrv_op_unblock_all(top_bs, s->blocker); | |
413 | error_free(s->blocker); | |
8dd9006e | 414 | reopen_backing_file(bs, false, NULL); |
29ff7890 WC |
415 | } |
416 | ||
417 | static void backup_job_completed(void *opaque, int ret) | |
418 | { | |
8dd9006e PB |
419 | BlockDriverState *bs = opaque; |
420 | BDRVReplicationState *s = bs->opaque; | |
29ff7890 | 421 | |
3c76c606 | 422 | if (s->stage != BLOCK_REPLICATION_FAILOVER) { |
29ff7890 WC |
423 | /* The backup job is cancelled unexpectedly */ |
424 | s->error = -EIO; | |
425 | } | |
426 | ||
8dd9006e | 427 | backup_job_cleanup(bs); |
29ff7890 WC |
428 | } |
429 | ||
680e0cc4 KW |
430 | static bool GRAPH_RDLOCK |
431 | check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs) | |
29ff7890 WC |
432 | { |
433 | BdrvChild *child; | |
434 | ||
435 | /* The bs itself is the top_bs */ | |
436 | if (top_bs == bs) { | |
437 | return true; | |
438 | } | |
439 | ||
440 | /* Iterate over top_bs's children */ | |
441 | QLIST_FOREACH(child, &top_bs->children, next) { | |
442 | if (child->bs == bs || check_top_bs(child->bs, bs)) { | |
443 | return true; | |
444 | } | |
445 | } | |
446 | ||
447 | return false; | |
448 | } | |
449 | ||
450 | static void replication_start(ReplicationState *rs, ReplicationMode mode, | |
451 | Error **errp) | |
452 | { | |
453 | BlockDriverState *bs = rs->opaque; | |
454 | BDRVReplicationState *s; | |
455 | BlockDriverState *top_bs; | |
a990a42b | 456 | BdrvChild *active_disk, *hidden_disk, *secondary_disk; |
29ff7890 | 457 | int64_t active_length, hidden_length, disk_length; |
29ff7890 | 458 | Error *local_err = NULL; |
2c59fd83 | 459 | BackupPerf perf = { .use_copy_range = true, .max_workers = 1 }; |
29ff7890 | 460 | |
2b3912f1 KW |
461 | GLOBAL_STATE_CODE(); |
462 | ||
29ff7890 WC |
463 | s = bs->opaque; |
464 | ||
08ddb4eb LS |
465 | if (s->stage == BLOCK_REPLICATION_DONE || |
466 | s->stage == BLOCK_REPLICATION_FAILOVER) { | |
467 | /* | |
468 | * This case happens when a secondary is promoted to primary. | |
469 | * Ignore the request because the secondary side of replication | |
470 | * doesn't have to do anything anymore. | |
471 | */ | |
08ddb4eb LS |
472 | return; |
473 | } | |
474 | ||
3c76c606 | 475 | if (s->stage != BLOCK_REPLICATION_NONE) { |
29ff7890 | 476 | error_setg(errp, "Block replication is running or done"); |
29ff7890 WC |
477 | return; |
478 | } | |
479 | ||
480 | if (s->mode != mode) { | |
481 | error_setg(errp, "The parameter mode's value is invalid, needs %d," | |
482 | " but got %d", s->mode, mode); | |
29ff7890 WC |
483 | return; |
484 | } | |
485 | ||
486 | switch (s->mode) { | |
487 | case REPLICATION_MODE_PRIMARY: | |
488 | break; | |
489 | case REPLICATION_MODE_SECONDARY: | |
004915a9 | 490 | bdrv_graph_rdlock_main_loop(); |
1e12ecfd LS |
491 | active_disk = bs->file; |
492 | if (!active_disk || !active_disk->bs || !active_disk->bs->backing) { | |
29ff7890 | 493 | error_setg(errp, "Active disk doesn't have backing file"); |
004915a9 | 494 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
495 | return; |
496 | } | |
497 | ||
a990a42b LS |
498 | hidden_disk = active_disk->bs->backing; |
499 | if (!hidden_disk->bs || !hidden_disk->bs->backing) { | |
29ff7890 | 500 | error_setg(errp, "Hidden disk doesn't have backing file"); |
004915a9 | 501 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
502 | return; |
503 | } | |
504 | ||
a990a42b LS |
505 | secondary_disk = hidden_disk->bs->backing; |
506 | if (!secondary_disk->bs || !bdrv_has_blk(secondary_disk->bs)) { | |
29ff7890 | 507 | error_setg(errp, "The secondary disk doesn't have block backend"); |
2b3912f1 | 508 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
509 | return; |
510 | } | |
2b3912f1 | 511 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
512 | |
513 | /* verify the length */ | |
1e12ecfd | 514 | active_length = bdrv_getlength(active_disk->bs); |
a990a42b LS |
515 | hidden_length = bdrv_getlength(hidden_disk->bs); |
516 | disk_length = bdrv_getlength(secondary_disk->bs); | |
29ff7890 WC |
517 | if (active_length < 0 || hidden_length < 0 || disk_length < 0 || |
518 | active_length != hidden_length || hidden_length != disk_length) { | |
519 | error_setg(errp, "Active disk, hidden disk, secondary disk's length" | |
520 | " are not the same"); | |
29ff7890 WC |
521 | return; |
522 | } | |
523 | ||
d470ad42 | 524 | /* Must be true, or the bdrv_getlength() calls would have failed */ |
a990a42b | 525 | assert(active_disk->bs->drv && hidden_disk->bs->drv); |
d470ad42 | 526 | |
0bb79c97 | 527 | bdrv_graph_rdlock_main_loop(); |
1e12ecfd | 528 | if (!active_disk->bs->drv->bdrv_make_empty || |
a990a42b | 529 | !hidden_disk->bs->drv->bdrv_make_empty) { |
29ff7890 WC |
530 | error_setg(errp, |
531 | "Active disk or hidden disk doesn't support make_empty"); | |
0bb79c97 | 532 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
533 | return; |
534 | } | |
0bb79c97 | 535 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
536 | |
537 | /* reopen the backing file in r/w mode */ | |
8dd9006e | 538 | reopen_backing_file(bs, true, &local_err); |
29ff7890 WC |
539 | if (local_err) { |
540 | error_propagate(errp, local_err); | |
29ff7890 WC |
541 | return; |
542 | } | |
543 | ||
6bc30f19 | 544 | bdrv_graph_wrlock(); |
afdaeb9e | 545 | |
3b78420b LS |
546 | bdrv_ref(hidden_disk->bs); |
547 | s->hidden_disk = bdrv_attach_child(bs, hidden_disk->bs, "hidden disk", | |
548 | &child_of_bds, BDRV_CHILD_DATA, | |
549 | &local_err); | |
550 | if (local_err) { | |
551 | error_propagate(errp, local_err); | |
6bc30f19 | 552 | bdrv_graph_wrunlock(); |
3b78420b LS |
553 | return; |
554 | } | |
555 | ||
556 | bdrv_ref(secondary_disk->bs); | |
557 | s->secondary_disk = bdrv_attach_child(bs, secondary_disk->bs, | |
558 | "secondary disk", &child_of_bds, | |
559 | BDRV_CHILD_DATA, &local_err); | |
560 | if (local_err) { | |
561 | error_propagate(errp, local_err); | |
6bc30f19 | 562 | bdrv_graph_wrunlock(); |
3b78420b LS |
563 | return; |
564 | } | |
a990a42b | 565 | |
29ff7890 WC |
566 | /* start backup job now */ |
567 | error_setg(&s->blocker, | |
568 | "Block device is in use by internal backup job"); | |
569 | ||
570 | top_bs = bdrv_lookup_bs(s->top_id, s->top_id, NULL); | |
571 | if (!top_bs || !bdrv_is_root_node(top_bs) || | |
572 | !check_top_bs(top_bs, bs)) { | |
573 | error_setg(errp, "No top_bs or it is invalid"); | |
6bc30f19 | 574 | bdrv_graph_wrunlock(); |
8dd9006e | 575 | reopen_backing_file(bs, false, NULL); |
29ff7890 WC |
576 | return; |
577 | } | |
578 | bdrv_op_block_all(top_bs, s->blocker); | |
579 | bdrv_op_unblock(top_bs, BLOCK_OP_TYPE_DATAPLANE, s->blocker); | |
580 | ||
6bc30f19 | 581 | bdrv_graph_wrunlock(); |
2b3912f1 | 582 | |
cc19f177 VSO |
583 | s->backup_job = backup_job_create( |
584 | NULL, s->secondary_disk->bs, s->hidden_disk->bs, | |
00e30f05 | 585 | 0, MIRROR_SYNC_MODE_NONE, NULL, 0, false, NULL, |
86c6a3b6 | 586 | &perf, |
111049a4 | 587 | BLOCKDEV_ON_ERROR_REPORT, |
bb02b65c | 588 | BLOCKDEV_ON_ERROR_REPORT, JOB_INTERNAL, |
111049a4 | 589 | backup_job_completed, bs, NULL, &local_err); |
29ff7890 WC |
590 | if (local_err) { |
591 | error_propagate(errp, local_err); | |
8dd9006e | 592 | backup_job_cleanup(bs); |
29ff7890 WC |
593 | return; |
594 | } | |
cc19f177 | 595 | job_start(&s->backup_job->job); |
29ff7890 WC |
596 | break; |
597 | default: | |
29ff7890 WC |
598 | abort(); |
599 | } | |
600 | ||
3c76c606 | 601 | s->stage = BLOCK_REPLICATION_RUNNING; |
29ff7890 WC |
602 | |
603 | if (s->mode == REPLICATION_MODE_SECONDARY) { | |
1e12ecfd | 604 | secondary_do_checkpoint(bs, errp); |
29ff7890 WC |
605 | } |
606 | ||
607 | s->error = 0; | |
29ff7890 WC |
608 | } |
609 | ||
610 | static void replication_do_checkpoint(ReplicationState *rs, Error **errp) | |
611 | { | |
612 | BlockDriverState *bs = rs->opaque; | |
b49f4755 | 613 | BDRVReplicationState *s = bs->opaque; |
29ff7890 | 614 | |
08ddb4eb LS |
615 | if (s->stage == BLOCK_REPLICATION_DONE || |
616 | s->stage == BLOCK_REPLICATION_FAILOVER) { | |
617 | /* | |
618 | * This case happens when a secondary was promoted to primary. | |
619 | * Ignore the request because the secondary side of replication | |
620 | * doesn't have to do anything anymore. | |
621 | */ | |
08ddb4eb LS |
622 | return; |
623 | } | |
624 | ||
29ff7890 | 625 | if (s->mode == REPLICATION_MODE_SECONDARY) { |
1e12ecfd | 626 | secondary_do_checkpoint(bs, errp); |
29ff7890 | 627 | } |
29ff7890 WC |
628 | } |
629 | ||
630 | static void replication_get_error(ReplicationState *rs, Error **errp) | |
631 | { | |
632 | BlockDriverState *bs = rs->opaque; | |
b49f4755 | 633 | BDRVReplicationState *s = bs->opaque; |
29ff7890 | 634 | |
08ddb4eb | 635 | if (s->stage == BLOCK_REPLICATION_NONE) { |
29ff7890 | 636 | error_setg(errp, "Block replication is not running"); |
29ff7890 WC |
637 | return; |
638 | } | |
639 | ||
640 | if (s->error) { | |
641 | error_setg(errp, "I/O error occurred"); | |
29ff7890 WC |
642 | return; |
643 | } | |
29ff7890 WC |
644 | } |
645 | ||
646 | static void replication_done(void *opaque, int ret) | |
647 | { | |
648 | BlockDriverState *bs = opaque; | |
649 | BDRVReplicationState *s = bs->opaque; | |
650 | ||
651 | if (ret == 0) { | |
3c76c606 | 652 | s->stage = BLOCK_REPLICATION_DONE; |
29ff7890 | 653 | |
6bc30f19 | 654 | bdrv_graph_wrlock(); |
3b78420b | 655 | bdrv_unref_child(bs, s->secondary_disk); |
29ff7890 | 656 | s->secondary_disk = NULL; |
3b78420b | 657 | bdrv_unref_child(bs, s->hidden_disk); |
29ff7890 | 658 | s->hidden_disk = NULL; |
6bc30f19 | 659 | bdrv_graph_wrunlock(); |
32a8aba3 | 660 | |
29ff7890 WC |
661 | s->error = 0; |
662 | } else { | |
3c76c606 | 663 | s->stage = BLOCK_REPLICATION_FAILOVER_FAILED; |
29ff7890 WC |
664 | s->error = -EIO; |
665 | } | |
666 | } | |
667 | ||
668 | static void replication_stop(ReplicationState *rs, bool failover, Error **errp) | |
669 | { | |
670 | BlockDriverState *bs = rs->opaque; | |
b49f4755 | 671 | BDRVReplicationState *s = bs->opaque; |
29ff7890 | 672 | |
08ddb4eb LS |
673 | if (s->stage == BLOCK_REPLICATION_DONE || |
674 | s->stage == BLOCK_REPLICATION_FAILOVER) { | |
675 | /* | |
676 | * This case happens when a secondary was promoted to primary. | |
677 | * Ignore the request because the secondary side of replication | |
678 | * doesn't have to do anything anymore. | |
679 | */ | |
08ddb4eb LS |
680 | return; |
681 | } | |
682 | ||
3c76c606 | 683 | if (s->stage != BLOCK_REPLICATION_RUNNING) { |
29ff7890 | 684 | error_setg(errp, "Block replication is not running"); |
29ff7890 WC |
685 | return; |
686 | } | |
687 | ||
688 | switch (s->mode) { | |
689 | case REPLICATION_MODE_PRIMARY: | |
3c76c606 | 690 | s->stage = BLOCK_REPLICATION_DONE; |
29ff7890 WC |
691 | s->error = 0; |
692 | break; | |
693 | case REPLICATION_MODE_SECONDARY: | |
694 | /* | |
695 | * This BDS will be closed, and the job should be completed | |
696 | * before the BDS is closed, because we will access hidden | |
697 | * disk, secondary disk in backup_job_completed(). | |
698 | */ | |
cc19f177 | 699 | if (s->backup_job) { |
4cfb3f05 | 700 | job_cancel_sync(&s->backup_job->job, true); |
29ff7890 WC |
701 | } |
702 | ||
703 | if (!failover) { | |
1e12ecfd | 704 | secondary_do_checkpoint(bs, errp); |
3c76c606 | 705 | s->stage = BLOCK_REPLICATION_DONE; |
29ff7890 WC |
706 | return; |
707 | } | |
708 | ||
1f051dcb | 709 | bdrv_graph_rdlock_main_loop(); |
3c76c606 | 710 | s->stage = BLOCK_REPLICATION_FAILOVER; |
cc19f177 | 711 | s->commit_job = commit_active_start( |
1e12ecfd | 712 | NULL, bs->file->bs, s->secondary_disk->bs, |
bb02b65c | 713 | JOB_INTERNAL, 0, BLOCKDEV_ON_ERROR_REPORT, |
78bbd910 | 714 | NULL, replication_done, bs, true, errp); |
1f051dcb | 715 | bdrv_graph_rdunlock_main_loop(); |
29ff7890 WC |
716 | break; |
717 | default: | |
29ff7890 WC |
718 | abort(); |
719 | } | |
29ff7890 WC |
720 | } |
721 | ||
2654267c HR |
722 | static const char *const replication_strong_runtime_opts[] = { |
723 | REPLICATION_MODE, | |
724 | REPLICATION_TOP_ID, | |
725 | ||
726 | NULL | |
727 | }; | |
728 | ||
782b9d06 | 729 | static BlockDriver bdrv_replication = { |
29ff7890 | 730 | .format_name = "replication", |
29ff7890 WC |
731 | .instance_size = sizeof(BDRVReplicationState), |
732 | ||
733 | .bdrv_open = replication_open, | |
734 | .bdrv_close = replication_close, | |
37a9051c | 735 | .bdrv_child_perm = replication_child_perm, |
29ff7890 | 736 | |
c86422c5 | 737 | .bdrv_co_getlength = replication_co_getlength, |
29ff7890 WC |
738 | .bdrv_co_readv = replication_co_readv, |
739 | .bdrv_co_writev = replication_co_writev, | |
740 | ||
741 | .is_filter = true, | |
29ff7890 | 742 | |
2654267c | 743 | .strong_runtime_opts = replication_strong_runtime_opts, |
29ff7890 WC |
744 | }; |
745 | ||
746 | static void bdrv_replication_init(void) | |
747 | { | |
748 | bdrv_register(&bdrv_replication); | |
749 | } | |
750 | ||
751 | block_init(bdrv_replication_init); |