sunrpc: add a rcu_head to svc_rqst and use kfree_rcu to free it

...also make the manipulation of sp_all_threads list use RCU-friendly
functions.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Tested-by: Chris Worley <chris.worley@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 5f0ab39bf7c3..7f80a99c59e4 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -223,6 +223,7 @@ static inline void svc_putu32(struct kvec *iov, __be32 val)
 struct svc_rqst {
         struct list_head        rq_list;        /* idle list */
         struct list_head        rq_all;         /* all threads list */
+        struct rcu_head         rq_rcu_head;    /* for RCU deferred kfree */
         struct svc_xprt *       rq_xprt;        /* transport ptr */
 
         struct sockaddr_storage rq_addr;        /* peer address */
@@ -262,6 +263,7 @@ struct svc_rqst {
 #define RQ_SPLICE_OK    (4)                     /* turned off in gss privacy
                                                  * to prevent encrypting page
                                                  * cache pages */
+#define RQ_VICTIM       (5)                     /* about to be shut down */
         unsigned long           rq_flags;       /* flags field */
 
         void *                  rq_argp;        /* decoded arguments */