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Subject[PATCH 3/3] xfs: 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 xfs_fs_fill_super() when -o dax is
specified.

Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Dave Chinner <david@fromorbit.com> (supporter:XFS FILESYSTEM)
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
---
fs/xfs/xfs_super.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 187e14b..a17aebc 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1563,6 +1563,11 @@ xfs_fs_fill_super(
xfs_alert(mp,
"Filesystem block size invalid for DAX Turning DAX off.");
mp->m_flags &= ~XFS_MOUNT_DAX;
+ } else if (sb->s_bdev->bd_part->start_sect % (PAGE_SIZE / 512)
+ || sb->s_bdev->bd_part->nr_sects % (PAGE_SIZE / 512)) {
+ xfs_alert(mp,
+ "Partition alignment invalid for DAX Turning DAX off.");
+ mp->m_flags &= ~XFS_MOUNT_DAX;
} else if (!sb->s_bdev->bd_disk->fops->direct_access) {
xfs_alert(mp,
"Block device does not support DAX Turning DAX off.");
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