[ndctl,v2,00/10] daxctl: Support for sub-dividing soft-reserved regions

Message

Joao Martins July 13, 2020, 4:08 p.m. UTC

Changes since v1:

* Add a Documentation/daxctl/ entry for each patch that adds commands or new
option.

* Fix functional test suite to only change region 0 and not touch others

* Fix reconfigure-device -s changes (third patch) for better bisection.

v1: https://lore.kernel.org/linux-nvdimm/[e-mail]/

---

This series introduces the daxctl support for sub-dividing soft-reserved 
regions created by EFI/HMAT/efi_fake_mem. It's the userspace counterpart
of this recent patch series [0].

These new 'dynamic' regions can be partitioned into multiple different devices
which its subdivisions can consist of one or more ranges. This
is in contrast to static dax regions -- created with ndctl-create-namespace
 -m devdax -- which can't be subdivided neither discontiguous. 
 See also cover-letter of [0].

The daxctl changes in these patches are depicted as:

 * {create,destroy,disable,enable}-device:
   
   These orchestrate/manage the sub-division devices.
   It mimmics the same as namespaces equivalent commands.

 * Allow reconfigure-device to change the size of an existing *dynamic* dax
 device.

 * Add test coverage (Tried to cover all range allocation code paths).
 v2 of kernel patches now passes this test suite.

 * Documentation regarding the new command additions.

[0] "device-dax: Support sub-dividing soft-reserved ranges",
https://lore.kernel.org/linux-nvdimm/[e-mail]/

Dan Williams (1):
  daxctl: Cleanup whitespace

Joao Martins (9):
  libdaxctl: add daxctl_dev_set_size()
  daxctl: add resize support in reconfigure-device
  daxctl: add command to disable devdax device
  daxctl: add command to enable devdax device
  libdaxctl: add daxctl_region_create_dev()
  daxctl: add command to create device
  libdaxctl: add daxctl_region_destroy_dev()
  daxctl: add command to destroy device
  daxctl/test: Add tests for dynamic dax regions

 Documentation/daxctl/Makefile.am                   |   6 +-
 Documentation/daxctl/daxctl-create-device.txt      | 105 +++++++
 Documentation/daxctl/daxctl-destroy-device.txt     |  63 +++++
 Documentation/daxctl/daxctl-disable-device.txt     |  58 ++++
 Documentation/daxctl/daxctl-enable-device.txt      |  59 ++++
 Documentation/daxctl/daxctl-reconfigure-device.txt |  16 ++
 daxctl/builtin.h                                   |   4 +
 daxctl/daxctl.c                                    |   4 +
 daxctl/device.c                                    | 310 ++++++++++++++++++++-
 daxctl/lib/libdaxctl.c                             |  67 +++++
 daxctl/lib/libdaxctl.sym                           |   7 +
 daxctl/libdaxctl.h                                 |   3 +
 test/Makefile.am                                   |   1 +
 test/daxctl-create.sh                              | 294 +++++++++++++++++++
 util/filter.c                                      |   2 +-
 15 files changed, 993 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/daxctl/daxctl-create-device.txt
 create mode 100644 Documentation/daxctl/daxctl-destroy-device.txt
 create mode 100644 Documentation/daxctl/daxctl-disable-device.txt
 create mode 100644 Documentation/daxctl/daxctl-enable-device.txt
 create mode 100755 test/daxctl-create.sh