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 <lkp@intel.com>
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 7cc469e..18448db 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1562,6 +1562,10 @@
/* 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 f4da693..1db3437 100644
--- a/fs/cifs/fscache.c
+++ b/fs/cifs/fscache.c
@@ -24,6 +24,7 @@
struct in_addr ipv4_addr;
struct in6_addr ipv6_addr;
};
+ __u64 conn_id;
} __packed;
/*
@@ -37,6 +38,14 @@
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 @@
server->fscache = NULL;
return;
}
+ key.conn_id = server->conn_id;
server->fscache =
fscache_acquire_cookie(cifs_fscache_netfs.primary_index,
