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authorLars Ellenberg <lars.ellenberg@linbit.com>2013-03-19 18:16:42 +0100
committerJens Axboe <axboe@kernel.dk>2013-03-22 18:13:59 -0600
commit9114d79569a3fb858a7ecb1f21cb1dec93dc2f21 (patch)
tree871deca58015097957ca605c55d6589f72f39297 /drivers/block/drbd/drbd_main.c
parenta937536b868b8369b98967929045f1df54234323 (diff)
downloadvexpress-lsk-9114d79569a3fb858a7ecb1f21cb1dec93dc2f21.tar.gz
drbd: cleanup bogus assert message
This fixes ASSERT( mdev->state.disk == D_FAILED ) in drivers/block/drbd/drbd_main.c When we detach from local disk, we let the local refcount hit zero twice. First, we transition to D_FAILED, so we won't give out new references to incoming requests; we still may give out *internal* references, though. Once the refcount hits zero [1] while in D_FAILED, we queue a transition to D_DISKLESS to our worker. We need to queue it, because we may be in atomic context when putting the reference. Once the transition to D_DISKLESS actually happened [2] from worker context, we don't give out new internal references either. Between hitting zero the first time [1] and actually transition to D_DISKLESS [2], there may be a few very short lived internal get/put, so we may hit zero more than once while being in D_FAILED, or even see a race where a an internal get_ldev() happened while D_FAILED, but the corresponding put_ldev() happens just after the transition to D_DISKLESS. That's why we have the additional test_and_set_bit(GO_DISKLESS,); and that's why the assert was placed wrong. Since there was exactly one code path left to drbd_go_diskless(), and that checks already for D_FAILED, drop that assert, and fold in the drbd_queue_work(). Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/drbd/drbd_main.c')
-rw-r--r--drivers/block/drbd/drbd_main.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index e98da675f0c..731a28eedc5 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -3252,13 +3252,6 @@ static int w_go_diskless(struct drbd_work *w, int unused)
return 0;
}
-void drbd_go_diskless(struct drbd_conf *mdev)
-{
- D_ASSERT(mdev->state.disk == D_FAILED);
- if (!test_and_set_bit(GO_DISKLESS, &mdev->flags))
- drbd_queue_work(&mdev->tconn->sender_work, &mdev->go_diskless);
-}
-
/**
* drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap
* @mdev: DRBD device.