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@xxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx> (supporter:XFS FILESYSTEM)
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
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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