From d3b178adb3a3adf54ecf77758138b654c3ee7f09 Mon Sep 17 00:00:00 2001 From: Goldwyn Rodrigues Date: Wed, 22 Jul 2015 12:09:17 -0500 Subject: [PATCH] md: Skip cluster setup for dm-raid There is a bug that the bitmap superblock isn't initialised properly for dm-raid, so a new field can have garbage in new fields. (dm-raid does initialisation in the kernel - md initialised the superblock in mdadm). This means that for dm-raid we cannot currently trust the new ->nodes field. So: - use __GFP_ZERO to initialise the superblock properly for all new arrays - initialise all fields in bitmap_info in bitmap_new_disk_sb - ignore ->nodes for dm arrays (yes, this is a hack) This bug exposes dm-raid to bug in the (still experimental) md-cluster code, so it is suitable for -stable. It does cause crashes. References: https://bugzilla.kernel.org/show_bug.cgi?id=100491 Cc: stable@vger.kernel.org (v4.1) Signed-off-By: Goldwyn Rodrigues Signed-off-by: NeilBrown --- Reading git-format-patch failed