From aaae506d545bb9d06f4d8362f670f406f12e4b58 Mon Sep 17 00:00:00 2001 From: Philipp Reisner Date: Thu, 6 Oct 2011 18:29:14 +0200 Subject: [PATCH] drbd: Fixed a race condition between detach and start of resync drbd_state_lock() is only there to serialize cluster wide state changes. Testing the local disk state needs to happen while holding the global_state_lock. Otherwise you might see something like this (Oct 6 on kugel) 14:20:24 drbd0: conn( WFSyncUUID -> Connected ) disk( Inconsistent -> Failed ) 14:20:24 drbd0: helper command: /sbin/drbdadm before-resync-target minor-0 exit code 0 (0x0) 14:20:24 drbd0: conn( Connected -> SyncTarget ) disk( Failed -> Inconsistent ) Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_worker.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 62bde5ae17f7..5fc60f622bed 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -1537,14 +1537,14 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side) } drbd_state_lock(mdev); - + write_lock_irq(&global_state_lock); if (!get_ldev_if_state(mdev, D_NEGOTIATING)) { + write_unlock_irq(&global_state_lock); drbd_state_unlock(mdev); return; } - write_lock_irq(&global_state_lock); - ns = mdev->state; + ns.i = mdev->state.i; ns.aftr_isp = !_drbd_may_sync_now(mdev); -- GitLab