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(-)
