[PATCH v3 0/4] fs, dax: lookup dax_device at mount time

Changes since v2 [1]:
* Split fs_dax_get_by_bdev() to its own patch (Christoph)

* Push dax_device reference management into <fs>_{fill,put}_super()
  rather than the generic vfs. (Christoph)

[1]: https://lists.01.org/pipermail/linux-nvdimm/2017-August/012133.html

---

Christoph notes:

    I just noticed that we now do a fs_dax_get_by_host in every
    iomap_begin call for DAX. This function iterates a list, does a
    string compared and igrab. I really think we need to cache this in
    the superblock (possible even the fs superblock) similar to what we
    do for the block device.

This passes the libnvdimm unit tests.

---

Dan Williams (4):
      dax: introduce a fs_dax_get_by_bdev() helper
      xfs: perform dax_device lookup at mount
      ext2: perform dax_device lookup at mount
      ext4: perform dax_device lookup at mount


 drivers/dax/super.c |   10 ++++++++++
 fs/ext2/ext2.h      |    1 +
 fs/ext2/inode.c     |   11 +++--------
 fs/ext2/super.c     |    5 +++++
 fs/ext4/ext4.h      |    1 +
 fs/ext4/inode.c     |   11 +++--------
 fs/ext4/super.c     |    5 +++++
 fs/xfs/xfs_aops.c   |   13 +++++++++++++
 fs/xfs/xfs_aops.h   |    1 +
 fs/xfs/xfs_buf.c    |    4 +++-
 fs/xfs/xfs_buf.h    |    3 ++-
 fs/xfs/xfs_iomap.c  |   10 +---------
 fs/xfs/xfs_super.c  |   25 +++++++++++++++++++++----
 include/linux/dax.h |    6 ++++++
 14 files changed, 75 insertions(+), 31 deletions(-)