linux-kernel - [PATCH] ceph: downgrade warning from mdsmap decode to debug

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Date:   Thu, 12 Nov 2020 11:25:32 +0000
From:   Luis Henriques <lhenriques@...e.de>
To:     Jeff Layton <jlayton@...nel.org>, Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Henriques <lhenriques@...e.de>
Subject: [PATCH] ceph: downgrade warning from mdsmap decode to debug

While the MDS cluster is unstable and changing state the client may get
mdsmap updates that will trigger warnings:

  [144692.478400] ceph: mdsmap_decode got incorrect state(up:standby-replay)
  [144697.489552] ceph: mdsmap_decode got incorrect state(up:standby-replay)
  [144697.489580] ceph: mdsmap_decode got incorrect state(up:standby-replay)

This patch downgrades these warnings to debug, as they may flood the logs
if the cluster is unstable for a while.

Signed-off-by: Luis Henriques <lhenriques@...e.de>
---
Hi!

This patch follows from my other patch "ceph: fix race in concurrent
__ceph_remove_cap invocations", where I see a *lot* of warnings before the
NULL pointer.  Maybe this could be a pr_warn_once instead, but not sure
that would be useful.

Note that before commit 4d7ace02ba5c ("ceph: fix mdsmap cluster available
check based on laggy number") this was simply ignored without any pr_warn
or dout.

Cheers,
--
Luis

 fs/ceph/mdsmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index e4aba6c6d3b5..1096d1d3a84c 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -243,8 +243,8 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 		}

 		if (state <= 0) {
-			pr_warn("mdsmap_decode got incorrect state(%s)\n",
-				ceph_mds_state_name(state));
+			dout("mdsmap_decode got incorrect state(%s)\n",
+			     ceph_mds_state_name(state));
 			continue;
 		}