The common way to expose a storage device is to export it through the gendisk structure, which takes care of handling the visibility lifetime of the device to user-space and carries device driver and block layer specific sysfs entries. For LightNVM, no gendisk is exposed, which hides these entries. This patchset enables LightNVM to expose a subset of the gendisk entries by implementing a new non-gendisk device that only exposes the sysfs entries that are relevant to the device driver and LightNVM. For example /mq and the NVMe sysfs entries. The new non-gendisk exposes itself in place of the original gendisk. Thus, a gendisk device exposed through /sys/class/nvme/nvme0n1, will still be exposed through the same directory, although only with the /mq, lightnvm, and nvme specific entries. The LightNVM storage device can be found through sysfs by searching for devices that has the "lightnvm" dev type. The patches require the just posted patches before they can be applied. They can also be found in the for-4.8/sysfs branch at: https://github.com/OpenChannelSSD/linux.git v3: - Fixed missing divising by nvme block nr. v2: - Updated "expose gennvm target type" to expose its own kobject, which pblk and others can hook into. - Fixed missing disk_name in null_blk patch on lightnvm device Matias Bjørling (4): nvme: refactor namespaces to support non-gendisk devices null_blk: refactor to support non-gendisk devices blk-mq: register device instead of disk lightnvm: let drivers control the lifetime of nvm_dev Simon A. F. Lund (2): lightnvm: expose device geometry through sysfs lightnvm: expose gennvm target type through sysfs block/blk-mq-sysfs.c | 13 ++- block/blk-sysfs.c | 4 +- drivers/block/null_blk.c | 128 +++++++++++++++++----------- drivers/lightnvm/Makefile | 2 +- drivers/lightnvm/core.c | 54 +++++------- drivers/lightnvm/gennvm.c | 112 +++++++++++++++++++++---- drivers/lightnvm/lightnvm.h | 35 ++++++++ drivers/lightnvm/sysfs.c | 195 +++++++++++++++++++++++++++++++++++++++++++ drivers/md/dm.c | 2 +- drivers/nvme/host/core.c | 165 ++++++++++++++++++++---------------- drivers/nvme/host/lightnvm.c | 34 ++++++-- drivers/nvme/host/nvme.h | 26 ++++-- include/linux/blk-mq.h | 4 +- include/linux/lightnvm.h | 28 +++++-- 14 files changed, 603 insertions(+), 199 deletions(-) create mode 100644 drivers/lightnvm/lightnvm.h create mode 100644 drivers/lightnvm/sysfs.c -- 2.1.4 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
