From 936a8383a021fe2451bcea233b84b1828f2e4a9d Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Thu, 12 Jan 2023 17:10:37 -0500 Subject: [PATCH] fs: dlm: send FIN ack back in right cases commit 00908b3388255fc1d3782b744d07f327712f401f upstream. This patch moves to send a ack back for receiving a FIN message only when we are in valid states. In other cases and there might be a sender waiting for a ack we just let it timeout at the senders time and hopefully all other cleanups will remove the FIN message on their sending queue. As an example we should never send out an ACK being in LAST_ACK state or we cannot assume a working socket communication when we are in CLOSED state. Cc: stable@vger.kernel.org Fixes: 489d8e559c65 ("fs: dlm: add reliable connection if reconnect") Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Greg Kroah-Hartman --- fs/dlm/midcomms.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c index e812e98098ec..702c14de7a4b 100644 --- a/fs/dlm/midcomms.c +++ b/fs/dlm/midcomms.c @@ -366,7 +366,7 @@ static int dlm_send_ack(int nodeid, uint32_t seq) struct dlm_msg *msg; char *ppc; - msg = dlm_lowcomms_new_msg(nodeid, mb_len, GFP_NOFS, &ppc, + msg = dlm_lowcomms_new_msg(nodeid, mb_len, GFP_ATOMIC, &ppc, NULL, NULL); if (!msg) return -ENOMEM; @@ -478,15 +478,14 @@ static void dlm_midcomms_receive_buffer(union dlm_packet *p, switch (p->header.h_cmd) { case DLM_FIN: - /* send ack before fin */ - dlm_send_ack(node->nodeid, node->seq_next); - spin_lock(&node->state_lock); pr_debug("receive fin msg from node %d with state %s\n", node->nodeid, dlm_state_str(node->state)); switch (node->state) { case DLM_ESTABLISHED: + dlm_send_ack(node->nodeid, node->seq_next); + node->state = DLM_CLOSE_WAIT; pr_debug("switch node %d to state %s\n", node->nodeid, dlm_state_str(node->state)); @@ -503,12 +502,14 @@ static void dlm_midcomms_receive_buffer(union dlm_packet *p, } break; case DLM_FIN_WAIT1: + dlm_send_ack(node->nodeid, node->seq_next); node->state = DLM_CLOSING; set_bit(DLM_NODE_FLAG_STOP_RX, &node->flags); pr_debug("switch node %d to state %s\n", node->nodeid, dlm_state_str(node->state)); break; case DLM_FIN_WAIT2: + dlm_send_ack(node->nodeid, node->seq_next); midcomms_node_reset(node); pr_debug("switch node %d to state %s\n", node->nodeid, dlm_state_str(node->state));