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(-)
