[PATCH] ceph: don't WARN if we're still opening a session to an MDS

[Luis Henriques]

If MDSs aren't available while mounting a filesystem, the session state will
transition from SESSION_OPENING to SESSION_CLOSING.  And in that scenario
check_session_state() will be called from delayed_work() and trigger this
WARN.

Avoid this by only WARNing after a session has already been established
(i.e., the s_ttl will be different from 0).

Fixes: 62575e270f66 ("ceph: check session state after bumping session->s_seq")
Signed-off-by: Luis Henriques <lhenriques@xxxxxxx>
---
 fs/ceph/mds_client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index e5af591d3bd4..86f09b1110a2 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -4468,7 +4468,7 @@ bool check_session_state(struct ceph_mds_session *s)
 		break;
 	case CEPH_MDS_SESSION_CLOSING:
 		/* Should never reach this when we're unmounting */
-		WARN_ON_ONCE(true);
+		WARN_ON_ONCE(s->s_ttl);
 		fallthrough;
 	case CEPH_MDS_SESSION_NEW:
 	case CEPH_MDS_SESSION_RESTARTING: