On Fri, Jun 19, 2015 at 9:33 AM, Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote: > 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. Simply partition the pmem device however you see fit and then blkdev_get_by_path(<dev>, FMODE_EXCL, <holder>) the resulting partition(s). See the BTT infrastructure for how to autodetect and re-assemble this allocation at sub-system init time: https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git/tree/drivers/nvdimm/btt_devs.c?h=libnvdimm-pending#n450 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
