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backup: use copy_bitmap in incremental backup

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We can use copy_bitmap instead of sync_bitmap. copy_bitmap is
initialized from sync_bitmap and it is more informative: we will not try
to process data, that is already in progress (by write notifier).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Message-id: 20171012135313.227864-6-vsementsov@virtuozzo.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-10-12 16:53:13 +03:00 committed by Jeff Cody
parent 085bd08e6f
commit 53f1c8794f
1 changed files with 17 additions and 38 deletions
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55
block/backup.c
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@ -362,49 +362,28 @@ static bool coroutine_fn yield_and_check(BackupBlockJob *job)
static int coroutine_fn backup_run_incremental(BackupBlockJob *job)
{
int ret;
bool error_is_read;
int ret = 0;
int clusters_per_iter;
uint32_t granularity;
int64_t offset;
int64_t cluster;
int64_t end;
BdrvDirtyBitmapIter *dbi;
HBitmapIter hbi;
granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap);
clusters_per_iter = MAX((granularity / job->cluster_size), 1);
dbi = bdrv_dirty_iter_new(job->sync_bitmap);
/* Find the next dirty sector(s) */
while ((offset = bdrv_dirty_iter_next(dbi)) >= 0) {
cluster = offset / job->cluster_size;
for (end = cluster + clusters_per_iter; cluster < end; cluster++) {
do {
if (yield_and_check(job)) {
goto out;
}
ret = backup_do_cow(job, cluster * job->cluster_size,
job->cluster_size, &error_is_read,
false);
if ((ret < 0) &&
backup_error_action(job, error_is_read, -ret) ==
BLOCK_ERROR_ACTION_REPORT) {
goto out;
}
} while (ret < 0);
}
/* If the bitmap granularity is smaller than the backup granularity,
* we need to advance the iterator pointer to the next cluster. */
if (granularity < job->cluster_size) {
bdrv_set_dirty_iter(dbi, cluster * job->cluster_size);
}
hbitmap_iter_init(&hbi, job->copy_bitmap, 0);
while ((cluster = hbitmap_iter_next(&hbi)) != -1) {
do {
if (yield_and_check(job)) {
return 0;
}
ret = backup_do_cow(job, cluster * job->cluster_size,
job->cluster_size, &error_is_read, false);
if (ret < 0 && backup_error_action(job, error_is_read, -ret) ==
BLOCK_ERROR_ACTION_REPORT)
{
return ret;
}
} while (ret < 0);
}
out:
bdrv_dirty_iter_free(dbi);
return ret;
return 0;
}
/* init copy_bitmap from sync_bitmap */