SUNRPC: Set memalloc_nofs_save() on all rpciod/xprtiod jobs

Set memalloc_nofs_save() on all the rpciod/xprtiod jobs so that we
ensure memory allocations for asynchronous rpc calls don't ever end
up recursing back to the NFS layer for memory reclaim.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index adc3c40..2168d4d 100644 (file)
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -19,6 +19,7 @@
 #include <linux/spinlock.h>
 #include <linux/mutex.h>
 #include <linux/freezer.h>
+#include <linux/sched/mm.h>
 
 #include <linux/sunrpc/clnt.h>
 
@@ -902,7 +903,10 @@ void rpc_execute(struct rpc_task *task)
 
 static void rpc_async_schedule(struct work_struct *work)
 {
+       unsigned int pflags = memalloc_nofs_save();
+
        __rpc_execute(container_of(work, struct rpc_task, u.tk_work));
+       memalloc_nofs_restore(pflags);
 }
 
 /**
@@ -1067,7 +1071,10 @@ static void rpc_free_task(struct rpc_task *task)
 
 static void rpc_async_release(struct work_struct *work)
 {
+       unsigned int pflags = memalloc_nofs_save();
+
        rpc_free_task(container_of(work, struct rpc_task, u.tk_work));
+       memalloc_nofs_restore(pflags);
 }
 
 static void rpc_release_resources_task(struct rpc_task *task)

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index f1ec211..b95f445 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -49,6 +49,7 @@
 #include <linux/sunrpc/metrics.h>
 #include <linux/sunrpc/bc_xprt.h>
 #include <linux/rcupdate.h>
+#include <linux/sched/mm.h>
 
 #include <trace/events/sunrpc.h>
 
@@ -643,11 +644,13 @@ static void xprt_autoclose(struct work_struct *work)
 {
        struct rpc_xprt *xprt =
                container_of(work, struct rpc_xprt, task_cleanup);
+       unsigned int pflags = memalloc_nofs_save();
 
        clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
        xprt->ops->close(xprt);
        xprt_release_write(xprt, NULL);
        wake_up_bit(&xprt->state, XPRT_LOCKED);
+       memalloc_nofs_restore(pflags);
 }
 
 /**

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 7754aa3..f5d7dcd 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -50,6 +50,7 @@
 #include <linux/bvec.h>
 #include <linux/highmem.h>
 #include <linux/uio.h>
+#include <linux/sched/mm.h>
 
 #include <trace/events/sunrpc.h>
 
@@ -680,7 +681,10 @@ static void xs_stream_data_receive_workfn(struct work_struct *work)
 {
        struct sock_xprt *transport =
                container_of(work, struct sock_xprt, recv_worker);
+       unsigned int pflags = memalloc_nofs_save();
+
        xs_stream_data_receive(transport);
+       memalloc_nofs_restore(pflags);
 }
 
 static void
@@ -1378,7 +1382,10 @@ static void xs_udp_data_receive_workfn(struct work_struct *work)
 {
        struct sock_xprt *transport =
                container_of(work, struct sock_xprt, recv_worker);
+       unsigned int pflags = memalloc_nofs_save();
+
        xs_udp_data_receive(transport);
+       memalloc_nofs_restore(pflags);
 }
 
 /**
@@ -1869,7 +1876,6 @@ static int xs_local_finish_connecting(struct rpc_xprt *xprt,
                sk->sk_write_space = xs_udp_write_space;
                sock_set_flag(sk, SOCK_FASYNC);
                sk->sk_error_report = xs_error_report;
-               sk->sk_allocation = GFP_NOIO;
 
                xprt_clear_connected(xprt);
 
@@ -2057,7 +2063,6 @@ static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
                sk->sk_data_ready = xs_data_ready;
                sk->sk_write_space = xs_udp_write_space;
                sock_set_flag(sk, SOCK_FASYNC);
-               sk->sk_allocation = GFP_NOIO;
 
                xprt_set_connected(xprt);
 
@@ -2220,7 +2225,6 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
                sk->sk_write_space = xs_tcp_write_space;
                sock_set_flag(sk, SOCK_FASYNC);
                sk->sk_error_report = xs_error_report;
-               sk->sk_allocation = GFP_NOIO;
 
                /* socket options */
                sock_reset_flag(sk, SOCK_LINGER);