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authorSowmini Varadhan <sowmini.varadhan@oracle.com>2016-06-04 13:59:58 -0700
committerDavid S. Miller <davem@davemloft.net>2016-06-07 15:10:15 -0700
commit335b48d980f631fbc5b233cbb3625ac0c86d67cb (patch)
treec09223b2cdbe5b6a9d876ad07a9ee29cebcb8588 /net/rds/tcp.h
parent80e509db54c81247b32fcb75bb1730fc789b893d (diff)
downloadlinux-335b48d980f631fbc5b233cbb3625ac0c86d67cb.tar.bz2
RDS: TCP: Add/use rds_tcp_reset_callbacks to reset tcp socket safely
When rds_tcp_accept_one() has to replace the existing tcp socket with a newer tcp socket (duelling-syn resolution), it must lock_sock() to suppress the rds_tcp_data_recv() path while callbacks are being changed. Also, existing RDS datagram reassembly state must be reset, so that the next datagram on the new socket does not have corrupted state. Similarly when resetting the newly accepted socket, appropriate locks and synchronization is needed. This commit ensures correct synchronization by invoking kernel_sock_shutdown to reset a newly accepted sock, and by taking appropriate lock_sock()s (for old and new sockets) when resetting existing callbacks. Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/tcp.h')
-rw-r--r--net/rds/tcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rds/tcp.h b/net/rds/tcp.h
index 41c228300525..ec0602b0dc24 100644
--- a/net/rds/tcp.h
+++ b/net/rds/tcp.h
@@ -50,6 +50,7 @@ struct rds_tcp_statistics {
void rds_tcp_tune(struct socket *sock);
void rds_tcp_nonagle(struct socket *sock);
void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn);
+void rds_tcp_reset_callbacks(struct socket *sock, struct rds_connection *conn);
void rds_tcp_restore_callbacks(struct socket *sock,
struct rds_tcp_connection *tc);
u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc);