[Cluster-devel] [PATCH 1/2] fs: dlm: fix sock release if listen fails

[Cluster-devel] [PATCH 1/2] fs: dlm: fix sock release if listen fails

[Alexander Aring]

This patch fixes a double sock_release() call when the listen() is
called for the dlm lowcomms listen socket. The caller of
dlm_listen_for_all should never care about releasing the socket if
dlm_listen_for_all() fails, it's done now only once if listen() fails.

Cc: stable at vger.kernel.org
Fixes: 2dc6b1158c28 ("fs: dlm: introduce generic listen")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
---
 fs/dlm/lowcomms.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 59f64c596233..2cb9f3b49e05 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1820,7 +1820,7 @@ static int dlm_listen_for_all(void)
 	result = sock->ops->listen(sock, 5);
 	if (result < 0) {
 		dlm_close_sock(&listen_con.sock);
-		goto out;
+		return result;
 	}
 
 	return 0;
@@ -2023,7 +2023,6 @@ int dlm_lowcomms_start(void)
 	dlm_proto_ops = NULL;
 fail_proto_ops:
 	dlm_allow_conn = 0;
-	dlm_close_sock(&listen_con.sock);
 	work_stop();
 fail_local:
 	deinit_local();
-- 
2.31.1

[Cluster-devel] [PATCH 2/2] fs: dlm: retry accept() until -EAGAIN or error returns

[Alexander Aring]

This patch fixes a race if we get two times an socket data ready event
while the listen connection worker is queued. Currently it will be
served only once but we need to do it (in this case twice) until we hit
-EAGAIN which tells us there is no pending accept going on.

This patch wraps an do while loop until we receive a return value which
is different than 0 as it was done before commit d11ccd451b65 ("fs: dlm:
listen socket out of connection hash").

Cc: stable at vger.kernel.org
Fixes: d11ccd451b65 ("fs: dlm: listen socket out of connection hash")
Signed-off-by: Alexander Aring <aahringo@redhat.com>
---
 fs/dlm/lowcomms.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 2cb9f3b49e05..871d4e9f49fb 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1543,7 +1543,11 @@ static void process_recv_sockets(struct work_struct *work)
 
 static void process_listen_recv_socket(struct work_struct *work)
 {
-	accept_from_sock(&listen_con);
+	int ret;
+
+	do {
+		ret = accept_from_sock(&listen_con);
+	} while (!ret);
 }
 
 static void dlm_connect(struct connection *con)
-- 
2.31.1