The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From ba58995909b5098ca4003af65b0ccd5a8d13dd25 Mon Sep 17 00:00:00 2001 From: Alexander Aring aahringo@redhat.com Date: Wed, 6 Apr 2022 13:34:16 -0400 Subject: [PATCH] dlm: fix pending remove if msg allocation fails
This patch unsets ls_remove_len and ls_remove_name if a message allocation of a remove messages fails. In this case we never send a remove message out but set the per ls ls_remove_len ls_remove_name variable for a pending remove. Unset those variable should indicate possible waiters in wait_pending_remove() that no pending remove is going on at this moment.
Cc: stable@vger.kernel.org Signed-off-by: Alexander Aring aahringo@redhat.com Signed-off-by: David Teigland teigland@redhat.com
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index 137cf09b51e5..f5330e58d1fc 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -4100,13 +4100,14 @@ static void send_repeat_remove(struct dlm_ls *ls, char *ms_name, int len) rv = _create_message(ls, sizeof(struct dlm_message) + len, dir_nodeid, DLM_MSG_REMOVE, &ms, &mh); if (rv) - return; + goto out;
memcpy(ms->m_extra, name, len); ms->m_hash = cpu_to_le32(hash);
send_message(mh, ms);
+out: spin_lock(&ls->ls_remove_spin); ls->ls_remove_len = 0; memset(ls->ls_remove_name, 0, DLM_RESNAME_MAXLEN);