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fs: dlm: check for pending users filling buffers

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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 <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring 2021-11-30 14:47:15 -05:00 committed by David Teigland
parent f70813d6a5
commit bcbfea41e1
1 changed files with 4 additions and 1 deletions
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5
fs/dlm/lowcomms.c
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@ -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;