From 58bfa1b0c19f27c36227452cec5b43c5b5edf7aa Mon Sep 17 00:00:00 2001 From: Shyam Prasad N Date: Thu, 2 Dec 2021 07:30:00 +0000 Subject: [PATCH] cifs: add server conn_id to fscache client cookie The fscache client cookie uses the server address (and port) as the cookie key. This is a problem when nosharesock is used. Two different connections will use duplicate cookies. Avoid this by adding server->conn_id to the key, so that it's guaranteed that cookie will not be duplicated. Also, for secondary channels of a session, copy the fscache pointer from the primary channel. The primary channel is guaranteed not to go away as long as secondary channels are in use. Also addresses minor problem found by kernel test robot. Reported-by: kernel test robot Signed-off-by: Shyam Prasad N Reviewed-by: Paulo Alcantara (SUSE) Signed-off-by: Steve French --- fs/cifs/connect.c | 4 ++++ fs/cifs/fscache.c | 10 ++++++++++ 2 files changed, 14 insertions(+) diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 7cc469e4682a4..18448dbd762a8 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1562,6 +1562,10 @@ smbd_connected: /* fscache server cookies are based on primary channel only */ if (!CIFS_SERVER_IS_CHAN(tcp_ses)) cifs_fscache_get_client_cookie(tcp_ses); +#ifdef CONFIG_CIFS_FSCACHE + else + tcp_ses->fscache = tcp_ses->primary_server->fscache; +#endif /* CONFIG_CIFS_FSCACHE */ /* queue echo request delayed work */ queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval); diff --git a/fs/cifs/fscache.c b/fs/cifs/fscache.c index f4da693760c11..1db3437f3b7db 100644 --- a/fs/cifs/fscache.c +++ b/fs/cifs/fscache.c @@ -24,6 +24,7 @@ struct cifs_server_key { struct in_addr ipv4_addr; struct in6_addr ipv6_addr; }; + __u64 conn_id; } __packed; /* @@ -37,6 +38,14 @@ void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) struct cifs_server_key key; uint16_t key_len = sizeof(key.hdr); + /* + * Check if cookie was already initialized so don't reinitialize it. + * In the future, as we integrate with newer fscache features, + * we may want to instead add a check if cookie has changed + */ + if (server->fscache) + return; + memset(&key, 0, sizeof(key)); /* @@ -62,6 +71,7 @@ void cifs_fscache_get_client_cookie(struct TCP_Server_Info *server) server->fscache = NULL; return; } + key.conn_id = server->conn_id; server->fscache = fscache_acquire_cookie(cifs_fscache_netfs.primary_index, -- 2.39.5