Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 139/171] libceph: prevent the race of incoming work during teardown | Date | Wed, 21 Nov 2012 16:41:25 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Guanjun He <gjhe@suse.com>
(cherry picked from commit a2a3258417eb6a1799cf893350771428875a8287)
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 <gjhe@suse.com> Reviewed-by: Sage Weil <sage@inktank.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- include/linux/ceph/messenger.h | 1 + net/ceph/ceph_common.c | 2 ++ net/ceph/messenger.c | 5 +++++ 3 files changed, 8 insertions(+)
--- 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; /* --- a/net/ceph/ceph_common.c +++ b/net/ceph/ceph_common.c @@ -495,6 +495,8 @@ void ceph_destroy_client(struct ceph_cli { dout("destroy_client %p\n", client); + atomic_set(&client->msgr.stopping, 1); + /* unmount */ ceph_osdc_stop(&client->osdc); --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -254,6 +254,9 @@ static void con_sock_state_closed(struct 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_mes encode_my_addr(msgr); msgr->nocrc = nocrc; + atomic_set(&msgr->stopping, 0); + dout("%s %p\n", __func__, msgr); } EXPORT_SYMBOL(ceph_messenger_init);
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