[PATCH 0/7] dax: unified host inode for device-dax mappings

[Dan Williams]

There are two scenarios where we need mappings of a /dev/dax device to
share a single host inode, invalidating mappings at device shutdown, and
coordinating resize of an actively mapped device.  This series addresses
the unmap-on-shutdown case and includes reworks, like the cdev api
conversion, to prepare for a dynamic resize / allocation capability.

Recall that device-DAX, introduced in v4.7 [1], is a mechanism to
provide deterministic mapping behavior for performance- /
feature-differentiated memory ranges.

[1]: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ab68f2622136

---

Dan Williams (7):
      dax: cleanup needlessly global symbol warnings
      dax: reorder dax_fops function definitions
      dax: rename fops from dax_dev_ to dax_
      dax: embed a struct device in dax_dev
      dax: convert to the cdev api
      dax: define a unified inode/address_space for device-dax mappings
      dax: unmap/truncate on device shutdown


 drivers/dax/Kconfig        |    5 
 drivers/dax/dax.c          |  555 ++++++++++++++++++++++++++------------------
 drivers/dax/pmem.c         |    2 
 fs/char_dev.c              |    1 
 include/uapi/linux/magic.h |    1 
 5 files changed, 337 insertions(+), 227 deletions(-)