From: Guanjun He Date: Mon, 9 Jul 2012 02:50:33 +0000 (-0700) Subject: libceph: prevent the race of incoming work during teardown X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a2a3258417eb6a1799cf893350771428875a8287;p=linux-beck.git libceph: prevent the race of incoming work during teardown Add an atomic variable 'stopping' as flag in struct ceph_messenger, set this flag to 1 in function ceph_destroy_client(), and add the condition code in function ceph_data_ready() to test the flag value, if true(1), just return. Signed-off-by: Guanjun He Reviewed-by: Sage Weil --- diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h index cfb1bbdac624..a310d7fe6e29 100644 --- a/include/linux/ceph/messenger.h +++ b/include/linux/ceph/messenger.h @@ -50,6 +50,7 @@ struct ceph_messenger { struct ceph_entity_inst inst; /* my name+address */ struct ceph_entity_addr my_enc_addr; + atomic_t stopping; bool nocrc; /* diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c index 58b09efb528d..3b45e01fa8d1 100644 --- a/net/ceph/ceph_common.c +++ b/net/ceph/ceph_common.c @@ -495,6 +495,8 @@ void ceph_destroy_client(struct ceph_client *client) { dout("destroy_client %p\n", client); + atomic_set(&client->msgr.stopping, 1); + /* unmount */ ceph_osdc_stop(&client->osdc); diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 16814d1f4774..63e1252d3af5 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -254,6 +254,9 @@ static void con_sock_state_closed(struct ceph_connection *con) static void ceph_sock_data_ready(struct sock *sk, int count_unused) { struct ceph_connection *con = sk->sk_user_data; + if (atomic_read(&con->msgr->stopping)) { + return; + } if (sk->sk_state != TCP_CLOSE_WAIT) { dout("%s on %p state = %lu, queueing work\n", __func__, @@ -2413,6 +2416,8 @@ void ceph_messenger_init(struct ceph_messenger *msgr, encode_my_addr(msgr); msgr->nocrc = nocrc; + atomic_set(&msgr->stopping, 0); + dout("%s %p\n", __func__, msgr); } EXPORT_SYMBOL(ceph_messenger_init);