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block/dirty-bitmap: add _locked version of bdrv_reclaim_dirty_bitmap 

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20180207155837.92351-4-vsementsov@virtuozzo.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2018-03-13 15:34:00 -04:00 committed by John Snow
parent 604ab74bb5
commit 044ee8e143
2 changed files with 21 additions and 10 deletions
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28
block/dirty-bitmap.c
View File

@ -320,17 +320,13 @@ BdrvDirtyBitmap *bdrv_dirty_bitmap_abdicate(BlockDriverState *bs,
* In cases of failure where we can no longer safely delete the parent,
* we may wish to re-join the parent and child/successor.
* The merged parent will be un-frozen, but not explicitly re-enabled.
* Called with BQL taken.
* Called within bdrv_dirty_bitmap_lock..unlock and with BQL taken.
*/
BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *parent,
Error **errp)
BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
BdrvDirtyBitmap *parent,
Error **errp)
{
BdrvDirtyBitmap *successor;
qemu_mutex_lock(parent->mutex);
successor = parent->successor;
BdrvDirtyBitmap *successor = parent->successor;
if (!successor) {
error_setg(errp, "Cannot reclaim a successor when none is present");
@ -344,9 +340,21 @@ BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
bdrv_release_dirty_bitmap_locked(bs, successor);
parent->successor = NULL;
return parent;
}
/* Called with BQL taken. */
BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap(BlockDriverState *bs,
BdrvDirtyBitmap *parent,
Error **errp)
{
BdrvDirtyBitmap *ret;
qemu_mutex_lock(parent->mutex);
ret = bdrv_reclaim_dirty_bitmap_locked(bs, parent, errp);
qemu_mutex_unlock(parent->mutex);
return parent;
return ret;
}
/**

3
include/block/dirty-bitmap.h
View File

@ -93,5 +93,8 @@ BdrvDirtyBitmap *bdrv_dirty_bitmap_next(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap);
char *bdrv_dirty_bitmap_sha256(const BdrvDirtyBitmap *bitmap, Error **errp);
int64_t bdrv_dirty_bitmap_next_zero(BdrvDirtyBitmap *bitmap, uint64_t start);
BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BlockDriverState *bs,
BdrvDirtyBitmap *bitmap,
Error **errp);
#endif