SUNRPC: Add a server side per-connection limit

Allow the user to limit the number of requests serviced through a single
connection, to help prevent faster clients from starving slower clients.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 7ca44fb5b675..7321ae933867 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -268,6 +268,7 @@ struct svc_rqst {
                                                  * cache pages */
 #define RQ_VICTIM       (5)                     /* about to be shut down */
 #define RQ_BUSY         (6)                     /* request is busy */
+#define RQ_DATA         (7)                     /* request has data */
         unsigned long           rq_flags;       /* flags field */
 
         void *                  rq_argp;        /* decoded arguments */
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 79ba50856707..ad899ffed3be 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -69,6 +69,7 @@ struct svc_xprt {
 
         struct svc_serv         *xpt_server;    /* service for transport */
         atomic_t                xpt_reserved;   /* space on outq that is rsvd */
+        atomic_t                xpt_nr_rqsts;   /* Number of requests */
         struct mutex            xpt_mutex;      /* to serialize sending data */
         spinlock_t              xpt_lock;       /* protects sk_deferred
                                                  * and xpt_auth_cache */