Hi Dennis, On Tue, Jun 21, 2016 at 03:56:26PM +0800, Dennis Yang wrote: > So my question is, does dm-thin have any mechanism to eliminate the race > when > discarded block is reused right away by another device? I'll try and recreate your scenario. The transaction-manager will not reallocate a block that's been freed within a transaction so that we can always rollback. So as long as there hasn't been a commit, reallocation shouldn't be possible. This is what normally guards allocation, but in your case I think you may be onto something and we may have to hold onto the data cell until the passdown discards are complete. - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
