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Subject[PATCH v3 0/5] Add alignment check for DAX mount
Date
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.

- Patch 1-2 add bdev_supports_dax() which performs all the checks
necessary for dax mount.
- Patch 3-5 change fillesystems to call bdev_supports_dax().

v3:
- Remove boilerplate code from filesytems (Christoph Hellwig)
- Add a helper function to perform all checks (Dave Chinner)

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 (5):
1/5 block: Add vfs_msg() interface
2/5 block: Add bdev_supports_dax() for dax mount checks
3/5 ext4: Add alignment check for DAX mount
4/5 ext2: Add alignment check for DAX mount
5/5 xfs: Add alignment check for DAX mount

---
fs/block_dev.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ext2/super.c | 11 ++--------
fs/ext4/super.c | 11 ++--------
fs/xfs/xfs_super.c | 12 +++++------
include/linux/blkdev.h | 12 +++++++++++
5 files changed, 75 insertions(+), 25 deletions(-)

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