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authorShyam Prasad N <sprasad@microsoft.com>2021-12-02 10:30:00 +0300
committerSteve French <stfrench@microsoft.com>2021-12-03 21:36:04 +0300
commit2adc82006bcb067523bedd38e93711c80fd274c1 (patch)
treec6b526729e658d7141a055a97515bc3362ad3b19
parent5bf91ef03d987eb617dffccbb0bf38b2451bf37f (diff)
downloadlinux-2adc82006bcb067523bedd38e93711c80fd274c1.tar.xz
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>
-rw-r--r--fs/cifs/connect.c4
-rw-r--r--fs/cifs/fscache.c10
2 files changed, 14 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 7cc469e4682a..18448dbd762a 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 f4da693760c1..1db3437f3b7d 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,