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block/snapshot: dirty all dirty bitmaps on snapshot-switch 

Snapshot-switch actually changes active state of disk so it should
reflect on dirty bitmaps. Otherwise next incremental backup using
these bitmaps will be invalid.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20171023092945.54532-1-vsementsov@virtuozzo.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-10-23 12:29:45 +03:00 committed by Max Reitz
parent bcb5270c75
commit 04dec3c3ae
1 changed files with 14 additions and 0 deletions
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14
block/snapshot.c
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@ -181,10 +181,24 @@ int bdrv_snapshot_goto(BlockDriverState *bs,
{
BlockDriver *drv = bs->drv;
int ret, open_ret;
int64_t len;
if (!drv) {
return -ENOMEDIUM;
}
len = bdrv_getlength(bs);
if (len < 0) {
return len;
}
/* We should set all bits in all enabled dirty bitmaps, because dirty
* bitmaps reflect active state of disk and snapshot switch operation
* actually dirties active state.
* TODO: It may make sense not to set all bits but analyze block status of
* current state and destination snapshot and do not set bits corresponding
* to both-zero or both-unallocated areas. */
bdrv_set_dirty(bs, 0, len);
if (drv->bdrv_snapshot_goto) {
return drv->bdrv_snapshot_goto(bs, snapshot_id);
}