[PATCH v2 0/3] Add alignment check for DAX mount

[Toshi Kani]

When a partition is not aligned by 4KB, mount -o dax succeeds,
but any read/write access to the filesystem fails, except for
metadata update.

Add alignment check to ext4, ext2, and xfs.

v2:
 - Use a helper function via ->direct_access for the check.
   (Christoph Hellwig)
 - Call bdev_direct_access() with sector 0 for the check.
   (Boaz Harrosh)

---
Toshi Kani (3):
 1/3 ext4: Add alignment check for DAX mount
 2/3 ext2: Add alignment check for DAX mount
 3/3 xfs: Add alignment check for DAX mount

---
 fs/ext2/super.c    | 21 +++++++++++++++++++--
 fs/ext4/super.c    | 20 ++++++++++++++++++--
 fs/xfs/xfs_super.c | 23 +++++++++++++++++++----
 3 files changed, 56 insertions(+), 8 deletions(-)