dm ioctl: allow dm_copy_name_and_uuid to return only one field
Allow NULL buffer in dm_copy_name_and_uuid if you only want to return one of
the fields.
(Required by a following patch that adds these fields to sysfs.)
Signed-off-by: Milan Broz <mbroz@redhat.com>
Reviewed-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 777c948..8da7a01 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1550,8 +1550,10 @@
goto out;
}
- strcpy(name, hc->name);
- strcpy(uuid, hc->uuid ? : "");
+ if (name)
+ strcpy(name, hc->name);
+ if (uuid)
+ strcpy(uuid, hc->uuid ? : "");
out:
up_read(&_hash_lock);