4 * Copyright (C) 2013 Proxmox Server Solutions
5 * Copyright (c) 2019 Virtuozzo International GmbH.
8 * Dietmar Maurer (dietmar@proxmox.com)
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
15 #include "qemu/osdep.h"
18 #include "block/block.h"
19 #include "block/block_int.h"
20 #include "block/blockjob_int.h"
21 #include "block/block_backup.h"
22 #include "block/block-copy.h"
23 #include "block/dirty-bitmap.h"
24 #include "qapi/error.h"
25 #include "qemu/cutils.h"
26 #include "sysemu/block-backend.h"
27 #include "qemu/bitmap.h"
28 #include "qemu/error-report.h"
30 #include "block/copy-before-write.h"
32 typedef struct BackupBlockJob {
34 BlockDriverState *cbw;
35 BlockDriverState *source_bs;
36 BlockDriverState *target_bs;
38 BdrvDirtyBitmap *sync_bitmap;
40 MirrorSyncMode sync_mode;
41 BitmapSyncMode bitmap_mode;
42 BlockdevOnError on_source_error;
43 BlockdevOnError on_target_error;
51 BlockCopyCallState *bg_bcs_call;
54 static const BlockJobDriver backup_job_driver;
56 static void backup_cleanup_sync_bitmap(BackupBlockJob *job, int ret)
59 bool sync = (((ret == 0) || (job->bitmap_mode == BITMAP_SYNC_MODE_ALWAYS)) \
60 && (job->bitmap_mode != BITMAP_SYNC_MODE_NEVER));
64 * We succeeded, or we always intended to sync the bitmap.
65 * Delete this bitmap and install the child.
67 bm = bdrv_dirty_bitmap_abdicate(job->sync_bitmap, NULL);
70 * We failed, or we never intended to sync the bitmap anyway.
71 * Merge the successor back into the parent, keeping all data.
73 bm = bdrv_reclaim_dirty_bitmap(job->sync_bitmap, NULL);
78 if (ret < 0 && job->bitmap_mode == BITMAP_SYNC_MODE_ALWAYS) {
79 /* If we failed and synced, merge in the bits we didn't copy: */
80 bdrv_dirty_bitmap_merge_internal(bm, block_copy_dirty_bitmap(job->bcs),
85 static void backup_commit(Job *job)
87 BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
89 backup_cleanup_sync_bitmap(s, 0);
93 static void backup_abort(Job *job)
95 BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
97 backup_cleanup_sync_bitmap(s, -1);
101 static void backup_clean(Job *job)
103 BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
104 block_job_remove_all_bdrv(&s->common);
105 bdrv_cbw_drop(s->cbw);
108 void backup_do_checkpoint(BlockJob *job, Error **errp)
110 BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common);
112 assert(block_job_driver(job) == &backup_job_driver);
114 if (backup_job->sync_mode != MIRROR_SYNC_MODE_NONE) {
115 error_setg(errp, "The backup job only supports block checkpoint in"
120 bdrv_set_dirty_bitmap(block_copy_dirty_bitmap(backup_job->bcs), 0,
124 static BlockErrorAction backup_error_action(BackupBlockJob *job,
125 bool read, int error)
128 return block_job_error_action(&job->common, job->on_source_error,
131 return block_job_error_action(&job->common, job->on_target_error,
136 static void coroutine_fn backup_block_copy_callback(void *opaque)
138 BackupBlockJob *s = opaque;
142 aio_co_wake(s->common.job.co);
144 job_enter(&s->common.job);
148 static int coroutine_fn backup_loop(BackupBlockJob *job)
150 BlockCopyCallState *s = NULL;
153 BlockErrorAction act;
155 while (true) { /* retry loop */
156 job->bg_bcs_call = s = block_copy_async(job->bcs, 0,
157 QEMU_ALIGN_UP(job->len, job->cluster_size),
158 job->perf.max_workers, job->perf.max_chunk,
159 backup_block_copy_callback, job);
161 while (!block_copy_call_finished(s) &&
162 !job_is_cancelled(&job->common.job))
164 job_yield(&job->common.job);
167 if (!block_copy_call_finished(s)) {
168 assert(job_is_cancelled(&job->common.job));
170 * Note that we can't use job_yield() here, as it doesn't work for
173 block_copy_call_cancel(s);
175 qemu_coroutine_yield();
176 assert(block_copy_call_finished(s));
181 if (job_is_cancelled(&job->common.job) ||
182 block_copy_call_succeeded(s))
188 if (block_copy_call_cancelled(s)) {
190 * Job is not cancelled but only block-copy call. This is possible
191 * after job pause. Now the pause is finished, start new block-copy
194 block_copy_call_free(s);
198 /* The only remaining case is failed block-copy call. */
199 assert(block_copy_call_failed(s));
201 ret = block_copy_call_status(s, &error_is_read);
202 act = backup_error_action(job, error_is_read, -ret);
204 case BLOCK_ERROR_ACTION_REPORT:
206 case BLOCK_ERROR_ACTION_STOP:
208 * Go to pause prior to starting new block-copy call on the next
211 job_pause_point(&job->common.job);
213 case BLOCK_ERROR_ACTION_IGNORE:
214 /* Proceed to new block-copy call to retry. */
220 block_copy_call_free(s);
224 block_copy_call_free(s);
225 job->bg_bcs_call = NULL;
229 static void backup_init_bcs_bitmap(BackupBlockJob *job)
232 BdrvDirtyBitmap *bcs_bitmap = block_copy_dirty_bitmap(job->bcs);
234 if (job->sync_mode == MIRROR_SYNC_MODE_BITMAP) {
235 bdrv_clear_dirty_bitmap(bcs_bitmap, NULL);
236 bdrv_dirty_bitmap_merge_internal(bcs_bitmap, job->sync_bitmap, NULL,
238 } else if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
240 * We can't hog the coroutine to initialize this thoroughly.
241 * Set a flag and resume work when we are able to yield safely.
243 block_copy_set_skip_unallocated(job->bcs, true);
246 estimate = bdrv_get_dirty_count(bcs_bitmap);
247 job_progress_set_remaining(&job->common.job, estimate);
250 static int coroutine_fn backup_run(Job *job, Error **errp)
252 BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
255 backup_init_bcs_bitmap(s);
257 if (s->sync_mode == MIRROR_SYNC_MODE_TOP) {
261 for (offset = 0; offset < s->len; ) {
262 if (job_is_cancelled(job)) {
266 job_pause_point(job);
268 if (job_is_cancelled(job)) {
272 /* rdlock protects the subsequent call to bdrv_is_allocated() */
273 bdrv_graph_co_rdlock();
274 ret = block_copy_reset_unallocated(s->bcs, offset, &count);
275 bdrv_graph_co_rdunlock();
282 block_copy_set_skip_unallocated(s->bcs, false);
285 if (s->sync_mode == MIRROR_SYNC_MODE_NONE) {
287 * All bits are set in bcs bitmap to allow any cluster to be copied.
288 * This does not actually require them to be copied.
290 while (!job_is_cancelled(job)) {
292 * Yield until the job is cancelled. We just let our before_write
293 * notify callback service CoW requests.
298 return backup_loop(s);
304 static void coroutine_fn backup_pause(Job *job)
306 BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
308 if (s->bg_bcs_call && !block_copy_call_finished(s->bg_bcs_call)) {
309 block_copy_call_cancel(s->bg_bcs_call);
311 qemu_coroutine_yield();
315 static void backup_set_speed(BlockJob *job, int64_t speed)
317 BackupBlockJob *s = container_of(job, BackupBlockJob, common);
320 * block_job_set_speed() is called first from block_job_create(), when we
321 * don't yet have s->bcs.
324 block_copy_set_speed(s->bcs, speed);
325 if (s->bg_bcs_call) {
326 block_copy_kick(s->bg_bcs_call);
331 static bool backup_cancel(Job *job, bool force)
333 BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
335 bdrv_cancel_in_flight(s->target_bs);
339 static const BlockJobDriver backup_job_driver = {
341 .instance_size = sizeof(BackupBlockJob),
342 .job_type = JOB_TYPE_BACKUP,
343 .free = block_job_free,
344 .user_resume = block_job_user_resume,
346 .commit = backup_commit,
347 .abort = backup_abort,
348 .clean = backup_clean,
349 .pause = backup_pause,
350 .cancel = backup_cancel,
352 .set_speed = backup_set_speed,
355 BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
356 BlockDriverState *target, int64_t speed,
357 MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap,
358 BitmapSyncMode bitmap_mode,
360 const char *filter_node_name,
362 BlockdevOnError on_source_error,
363 BlockdevOnError on_target_error,
365 BlockCompletionFunc *cb, void *opaque,
366 JobTxn *txn, Error **errp)
368 int64_t len, target_len;
369 BackupBlockJob *job = NULL;
370 int64_t cluster_size;
371 BlockDriverState *cbw = NULL;
372 BlockCopyState *bcs = NULL;
378 /* QMP interface protects us from these cases */
379 assert(sync_mode != MIRROR_SYNC_MODE_INCREMENTAL);
380 assert(sync_bitmap || sync_mode != MIRROR_SYNC_MODE_BITMAP);
383 error_setg(errp, "Source and target cannot be the same");
387 bdrv_graph_rdlock_main_loop();
388 if (!bdrv_is_inserted(bs)) {
389 error_setg(errp, "Device is not inserted: %s",
390 bdrv_get_device_name(bs));
394 if (!bdrv_is_inserted(target)) {
395 error_setg(errp, "Device is not inserted: %s",
396 bdrv_get_device_name(target));
400 if (compress && !bdrv_supports_compressed_writes(target)) {
401 error_setg(errp, "Compression is not supported for this drive %s",
402 bdrv_get_device_name(target));
406 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
410 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_BACKUP_TARGET, errp)) {
413 bdrv_graph_rdunlock_main_loop();
415 if (perf->max_workers < 1 || perf->max_workers > INT_MAX) {
416 error_setg(errp, "max-workers must be between 1 and %d", INT_MAX);
420 if (perf->max_chunk < 0) {
421 error_setg(errp, "max-chunk must be zero (which means no limit) or "
427 /* If we need to write to this bitmap, check that we can: */
428 if (bitmap_mode != BITMAP_SYNC_MODE_NEVER &&
429 bdrv_dirty_bitmap_check(sync_bitmap, BDRV_BITMAP_DEFAULT, errp)) {
433 /* Create a new bitmap, and freeze/disable this one. */
434 if (bdrv_dirty_bitmap_create_successor(sync_bitmap, errp) < 0) {
439 len = bdrv_getlength(bs);
441 GRAPH_RDLOCK_GUARD_MAINLOOP();
442 error_setg_errno(errp, -len, "Unable to get length for '%s'",
443 bdrv_get_device_or_node_name(bs));
447 target_len = bdrv_getlength(target);
448 if (target_len < 0) {
449 GRAPH_RDLOCK_GUARD_MAINLOOP();
450 error_setg_errno(errp, -target_len, "Unable to get length for '%s'",
451 bdrv_get_device_or_node_name(bs));
455 if (target_len != len) {
456 error_setg(errp, "Source and target image have different sizes");
460 cbw = bdrv_cbw_append(bs, target, filter_node_name, &bcs, errp);
465 cluster_size = block_copy_cluster_size(bcs);
467 if (perf->max_chunk && perf->max_chunk < cluster_size) {
468 error_setg(errp, "Required max-chunk (%" PRIi64 ") is less than backup "
469 "cluster size (%" PRIi64 ")", perf->max_chunk, cluster_size);
473 /* job->len is fixed, so we can't allow resize */
474 job = block_job_create(job_id, &backup_job_driver, txn, cbw,
476 speed, creation_flags, cb, opaque, errp);
483 job->target_bs = target;
484 job->on_source_error = on_source_error;
485 job->on_target_error = on_target_error;
486 job->sync_mode = sync_mode;
487 job->sync_bitmap = sync_bitmap;
488 job->bitmap_mode = bitmap_mode;
490 job->cluster_size = cluster_size;
494 block_copy_set_copy_opts(bcs, perf->use_copy_range, compress);
495 block_copy_set_progress_meter(bcs, &job->common.job.progress);
496 block_copy_set_speed(bcs, speed);
498 /* Required permissions are taken by copy-before-write filter target */
499 bdrv_graph_wrlock(target);
500 block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
502 bdrv_graph_wrunlock(target);
508 bdrv_reclaim_dirty_bitmap(sync_bitmap, NULL);
517 bdrv_graph_rdunlock_main_loop();