Hi I looked at the new the persistent memory block device driver (drivers/block/pmem.c and arch/x86/kernel/pmem.c) and it seems that the interface between them is incorrect. If I want to use persistent memory in another driver, for a different purpose, how can I make sure that that drivers/block/pmem.c doesn't attach to this piece of memory and export it? It seems not possible. drivers/block/pmem.c attaches to everything without regard that there may be other users of persistent memory. I think a correct solution would be to add a partition table at the beginning of persistent memory area and this partition table would describe which parts belong to which programs - so that different programs could use persistent memory and not step over each other's data. Is there some effort to standardize the partition table ongoing? BTW. some journaling filesystems assume that 512-byte sector is written atomically. drivers/block/pmem.c breaks this requirement. Persistent memory only gurantees 8-byte atomic writes. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
