SUNRPC/xprt: async tasks mustn't block waiting for memory

When memory is short, new worker threads cannot be created and we depend
on the minimum one rpciod thread to be able to handle everything.  So it
must not block waiting for memory.

xprt_dynamic_alloc_slot can block indefinitely.  This can tie up all
workqueue threads and NFS can deadlock.  So when called from a
workqueue, set __GFP_NORETRY.

The rdma alloc_slot already does not block.  However it sets the error
to -EAGAIN suggesting this will trigger a sleep.  It does not.  As we
can see in call_reserveresult(), only -ENOMEM causes a sleep.  -EAGAIN
causes immediate retry.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 9f0025e..2d1f84a 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1687,12 +1687,15 @@ out:
 static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt)
 {
        struct rpc_rqst *req = ERR_PTR(-EAGAIN);
+       gfp_t gfp_mask = GFP_KERNEL;
 
        if (xprt->num_reqs >= xprt->max_reqs)
                goto out;
        ++xprt->num_reqs;
        spin_unlock(&xprt->reserve_lock);
-       req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL);
+       if (current->flags & PF_WQ_WORKER)
+               gfp_mask |= __GFP_NORETRY | __GFP_NOWARN;
+       req = kzalloc(sizeof(*req), gfp_mask);
        spin_lock(&xprt->reserve_lock);
        if (req != NULL)
                goto out;

diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
index 5714bf8..923e4b5 100644 (file)
--- a/net/sunrpc/xprtrdma/transport.c
+++ b/net/sunrpc/xprtrdma/transport.c
@@ -517,7 +517,7 @@ xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
        return;
 
 out_sleep:
-       task->tk_status = -EAGAIN;
+       task->tk_status = -ENOMEM;
        xprt_add_backlog(xprt, task);
 }