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2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Kevin Wolf , vsementsov@virtuozzo.com, Markus Armbruster , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/6/19 10:27 PM, Eric Blake wrote: > On 6/6/19 1:41 PM, John Snow wrote: >> When we check to see if we can store a bitmap, we don't check how many >> we've queued up. This can cause a problem saving bitmaps on close >> instead of when we request them to be added. With the stricter add >> interface, prohibit these bitmaps specifically. >> >> To match, make the remove interface more strict as well; now rejecting >> any requests to remove bitmaps that were never queued for storage. >> >> We don't need to "find" the bitmap when the interface has been given the >> bitmap explicitly, but this is done to make sure that the bitmap given >> actually does belong to the bs we were passed as a paranoia check to >> enforce consistency. >> >> --- > > Oops - that marker... > >> >> "What about directory size?" Please see the following patch. >> >> Signed-off-by: John Snow > > ...renders the S-o-b invisible. > >> +++ b/block/qcow2-bitmap.c >> @@ -1402,6 +1402,23 @@ static Qcow2Bitmap *find_bitmap_by_name(Qcow2BitmapList *bm_list, >> return NULL; >> } >> >> +static int qcow2_remove_queued_dirty_bitmap( >> + BlockDriverState *bs, const char *name, Error **errp) >> +{ >> + BDRVQcow2State *s = bs->opaque; >> + BdrvDirtyBitmap *bitmap = bdrv_find_dirty_bitmap(bs, name); >> + if (!bitmap) { >> + error_setg(errp, "Node '%s' has no stored or enqueued bitmap '%s'", >> + bdrv_get_node_name(bs), name); >> + return -ENOENT; >> + } >> + assert(s->nb_queued_bitmaps > 0); >> + assert(bdrv_dirty_bitmap_get_persistence(bitmap)); >> + s->nb_queued_bitmaps -= 1; > > I tend to use -- over -= 1. > >> @@ -1667,6 +1686,8 @@ int qcow2_add_persistent_dirty_bitmap(BlockDriverState *bs, >> goto fail; >> } >> >> + s->nb_queued_bitmaps += 1; > > And again, for ++ > > Reviewed-by: Eric Blake > Wow, sorry, lots of Python lately!