vfs: plumb remap flags through the vfs dedupe functions

Plumb a remap_flags argument through the vfs_dedupe_file_range_one
functions so that dedupe can take advantage of it.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

fs/overlayfs/file.c

@@ -467,7 +467,8 @@ static loff_t ovl_copyfile(struct file *file_in, loff_t pos_in,
 
 	case OVL_DEDUPE:
 		ret = vfs_dedupe_file_range_one(real_in.file, pos_in,
-						real_out.file, pos_out, len);
+						real_out.file, pos_out, len,
+						flags);
 		break;
 	}
 	revert_creds(old_cred);