linux-kernel - [PATCH AUTOSEL 5.14 86/99] fs: dlm: avoid comms shutdown delay in release

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Date:   Thu,  9 Sep 2021 20:15:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Alexander Aring <aahringo@...hat.com>,
        Chris Mackowski <cmackows@...hat.com>,
        David Teigland <teigland@...hat.com>,
        Sasha Levin <sashal@...nel.org>, cluster-devel@...hat.com
Subject: [PATCH AUTOSEL 5.14 86/99] fs: dlm: avoid comms shutdown delay in release_lockspace

From: Alexander Aring <aahringo@...hat.com>

[ Upstream commit ecd95673142ef80169a6c003b569b8a86d1e6329 ]

When dlm_release_lockspace does active shutdown on connections to
other nodes, the active shutdown will wait for any exisitng passive
shutdowns to be resolved.  But, the sequence of operations during
dlm_release_lockspace can prevent the normal resolution of passive
shutdowns (processed normally by way of lockspace recovery.)
This disruption of passive shutdown handling can cause the active
shutdown to wait for a full timeout period, delaying the completion
of dlm_release_lockspace.

To fix this, make dlm_release_lockspace resolve existing passive
shutdowns (by calling dlm_clear_members earlier), before it does
active shutdowns.  The active shutdowns will not find any passive
shutdowns to wait for, and will not be delayed.

Reported-by: Chris Mackowski <cmackows@...hat.com>
Signed-off-by: Alexander Aring <aahringo@...hat.com>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/dlm/lockspace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index d71aba8c3e64..e51ae83fc5b4 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -793,6 +793,7 @@ static int release_lockspace(struct dlm_ls *ls, int force)

 	if (ls_count == 1) {
 		dlm_scand_stop();
+		dlm_clear_members(ls);
 		dlm_midcomms_shutdown();
 	}

-- 
2.30.2