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_dax_supported() which performs all the checks necessary for dax mount. - Patch 3-5 change fillesystems to call bdev_dax_supported(). - Patch 6 is a cleanup to keep dax capability checks consistent. v4: - blkdev_dax_capable() is similar to bdev_dax_supported(). Manage them consistently. (Dan Williams, Dave Chinner) 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 (6): 1/6 block: Add vfs_msg() interface 2/6 block: Add bdev_dax_supported() for dax mount checks 3/6 ext4: Add alignment check for DAX mount 4/6 ext2: Add alignment check for DAX mount 5/6 xfs: Add alignment check for DAX mount 6/6 block: Update blkdev_dax_capable() for consistency --- block/ioctl.c | 30 ---------------- fs/block_dev.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++++-- fs/ext2/super.c | 11 ++---- fs/ext4/super.c | 11 ++---- fs/xfs/xfs_super.c | 12 +++---- include/linux/blkdev.h | 13 +++++++ include/linux/fs.h | 8 ----- 7 files changed, 116 insertions(+), 65 deletions(-)
