lkml.org 
[lkml]   [2014]   [Nov]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3.17 028/319] SUNRPC: Dont wake tasks during connection abort
Date
3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin Coddington <bcodding@redhat.com>

commit a743419f420a64d442280845c0377a915b76644f upstream.

When aborting a connection to preserve source ports, don't wake the task in
xs_error_report. This allows tasks with RPC_TASK_SOFTCONN to succeed if the
connection needs to be re-established since it preserves the task's status
instead of setting it to the status of the aborting kernel_connect().

This may also avoid a potential conflict on the socket's lock.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
include/linux/sunrpc/xprt.h | 1 +
net/sunrpc/xprtsock.c | 4 ++++
2 files changed, 5 insertions(+)

--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -357,6 +357,7 @@ int xs_swapper(struct rpc_xprt *xprt,
#define XPRT_CONNECTION_ABORT (7)
#define XPRT_CONNECTION_CLOSE (8)
#define XPRT_CONGESTED (9)
+#define XPRT_CONNECTION_REUSE (10)

static inline void xprt_set_connected(struct rpc_xprt *xprt)
{
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -845,6 +845,8 @@ static void xs_error_report(struct sock
dprintk("RPC: xs_error_report client %p, error=%d...\n",
xprt, -err);
trace_rpc_socket_error(xprt, sk->sk_socket, err);
+ if (test_bit(XPRT_CONNECTION_REUSE, &xprt->state))
+ goto out;
xprt_wake_pending_tasks(xprt, err);
out:
read_unlock_bh(&sk->sk_callback_lock);
@@ -2245,7 +2247,9 @@ static void xs_tcp_setup_socket(struct w
abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
&xprt->state);
/* "close" the socket, preserving the local port */
+ set_bit(XPRT_CONNECTION_REUSE, &xprt->state);
xs_tcp_reuse_connection(transport);
+ clear_bit(XPRT_CONNECTION_REUSE, &xprt->state);

if (abort_and_exit)
goto out_eagain;



\
 
 \ /
  Last update: 2014-11-12 02:41    [W:0.806 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site