xfs: add DAX truncate support
When we truncate a DAX file, we need to call through the DAX page
truncation path rather than through block_truncate_page() so that
mappings and block zeroing are all handled correctly. Otherwise,
truncate does not need to change.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index f4cd720..0994f95 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -851,7 +851,11 @@
* to hope that the caller sees ENOMEM and retries the truncate
* operation.
*/
- error = block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
+ if (IS_DAX(inode))
+ error = dax_truncate_page(inode, newsize, xfs_get_blocks_direct);
+ else
+ error = block_truncate_page(inode->i_mapping, newsize,
+ xfs_get_blocks);
if (error)
return error;
truncate_setsize(inode, newsize);