HI John, On Sat, May 03, 2014 at 02:24:48AM +0000, John Utz wrote: > So, the stuff in persistent-data sure seems like a good candidate for getting the job done. :-) It's nice that you're considering using the pd library. Probably the simplest user of pd is the dm-era target. > It seems like the first basic action one would want to perform would > be to create a metadata 'blob' and then at some point in the future > one would regularly want to open said metadata blob. The > dm_sm_metadata_create and open functions seem perfect for the job. > But for some reason, I am unable to find a place in the md directory > where this is getting used. Use dm_tm_create_with_sm(), this creates both the transaction manager, which you *must* have, and the metadata space map. See the comment at the end of drivers/md/persistent-data/dm-transaction-manager.h > I would have thought that dm-cache-metadata.c would be using it, but it doesnt seem to be thinking about this in the same way. It uses dm_block_manager_create() and __create_persistent_data_objects(). It does, indirectly. - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
