sunrpc: convert sp_task_pending flag to use atomic bitops

In a later patch, we'll want to be able to handle this flag without
holding the sp_lock. Change this field to an unsigned long flags
field, and declare a new flag in it that can be managed with atomic
bitops.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 8054a30..5f0ab39 100644 (file)
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -50,7 +50,9 @@ struct svc_pool {
        unsigned int            sp_nrthreads;   /* # of threads in pool */
        struct list_head        sp_all_threads; /* all server threads */
        struct svc_pool_stats   sp_stats;       /* statistics on pool operation */
-       int                     sp_task_pending;/* has pending task */
+#define        SP_TASK_PENDING         (0)             /* still work to do even if no
+                                                * xprt is queued. */
+       unsigned long           sp_flags;
 } ____cacheline_aligned_in_smp;
 
 /*

diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 143c4c8..3744604 100644 (file)
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -509,7 +509,7 @@ void svc_wake_up(struct svc_serv *serv)
                         */
                        wake_up_process(rqstp->rq_task);
                } else
-                       pool->sp_task_pending = 1;
+                       set_bit(SP_TASK_PENDING, &pool->sp_flags);
                spin_unlock_bh(&pool->sp_lock);
        }
 }
@@ -644,10 +644,9 @@ static struct svc_xprt *svc_get_next_xprt(struct svc_rqst *rqstp, long timeout)
                 * long for cache updates.
                 */
                rqstp->rq_chandle.thread_wait = 1*HZ;
-               pool->sp_task_pending = 0;
+               clear_bit(SP_TASK_PENDING, &pool->sp_flags);
        } else {
-               if (pool->sp_task_pending) {
-                       pool->sp_task_pending = 0;
+               if (test_and_clear_bit(SP_TASK_PENDING, &pool->sp_flags)) {
                        xprt = ERR_PTR(-EAGAIN);
                        goto out;
                }