Handle NULL mirror child vdev

When selecting a mirror child it's possible that map allocated by vdev_mirror_map_allc() contains a NULL for the child vdev. In this case the child should be skipped and the read issues to another member of the mirror. Signed-off-by: Brian Behlendorf <[email protected]> Signed-off-by: Ned Bass <[email protected]> Closes openzfs#1744
prashks · Oct 17, 2014 · 33074f2 · 33074f2
1 parent f0e324f
commit 33074f2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/module/zfs/vdev_mirror.c b/module/zfs/vdev_mirror.c
@@ -300,7 +300,7 @@ vdev_mirror_child_select(zio_t *zio)
 		mc = &mm->mm_child[c];
 		if (mc->mc_tried || mc->mc_skipped)
 			continue;
-		if (!vdev_readable(mc->mc_vd)) {
+		if (mc->mc_vd == NULL || !vdev_readable(mc->mc_vd)) {
 			mc->mc_error = SET_ERROR(ENXIO);
 			mc->mc_tried = 1;	/* don't even try */
 			mc->mc_skipped = 1;