From bcbfea41e1f9d516faed1faf0f2d390c000bf0d9 Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Tue, 30 Nov 2021 14:47:15 -0500 Subject: [PATCH] fs: dlm: check for pending users filling buffers Currently we don't care if the DLM application stack is filling buffers (not committed yet) while we transmit some already committed buffers. By checking on active writequeue users before dequeue a writequeue entry we know there is coming more data and do nothing. We wait until the send worker will be triggered again if the writequeue entry users hit zero. Signed-off-by: Alexander Aring Signed-off-by: David Teigland --- fs/dlm/lowcomms.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index f7fc1ac76ce8..6d500ebc6145 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -201,7 +201,10 @@ static struct writequeue_entry *con_next_wq(struct connection *con) e = list_first_entry(&con->writequeue, struct writequeue_entry, list); - if (e->len == 0) + /* if len is zero nothing is to send, if there are users filling + * buffers we wait until the users are done so we can send more. + */ + if (e->users || e->len == 0) return NULL; return e;