udf_readdir: do not advance offset if entry can not be uio-ed

Previosly readdir missed some directory entries because there was
no space for them in current uio but directory stream offset
was advanced nevertheless.
jhb has discoved the issue and provided a test-case.

Reviewed by:	bde
Approved by:	jhb (mentor)

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/fs/udf/udf_vnops.c b/sys/fs/udf/udf_vnops.c
index aa1791e..a3c3fa2 100644
--- a/sys/fs/udf/udf_vnops.c
+++ b/sys/fs/udf/udf_vnops.c
@@ -859,11 +859,11 @@ udf_readdir(struct vop_readdir_args *a)
 		}
 		if (error)
 			break;
+		uio->uio_offset = ds->offset + ds->off;
 	}
 
 	/* tell the calling layer whether we need to be called again */
 	*a->a_eofflag = uiodir.eofflag;
-	uio->uio_offset = ds->offset + ds->off;
 
 	if (error < 0)
 		error = 0;