[PATCH] NLM: fix a client-side race on blocking locks.

 If the lock blocks, the server may send us a GRANTED message that
 races with the reply to our LOCK request. Make sure that we catch
 the GRANTED by queueing up our request on the nlm_blocked list
 before we send off the first LOCK rpc call.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 0d9d2257821..16d4e5a08e1 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -72,6 +72,8 @@ struct nlm_lockowner {
         uint32_t pid;
 };
 
+struct nlm_wait;
+
 /*
  * Memory chunk for NLM client RPC request.
  */
@@ -81,6 +83,7 @@ struct nlm_rqst {
         struct nlm_host *       a_host;         /* host handle */
         struct nlm_args         a_args;         /* arguments */
         struct nlm_res          a_res;          /* result */
+        struct nlm_wait *       a_block;
         char                    a_owner[NLMCLNT_OHSIZE];
 };
 
@@ -142,7 +145,9 @@ extern unsigned long		nlmsvc_timeout;
  * Lockd client functions
  */
 struct nlm_rqst * nlmclnt_alloc_call(void);
-int               nlmclnt_block(struct nlm_host *, struct file_lock *, u32 *);
+int               nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl);
+void              nlmclnt_finish_block(struct nlm_rqst *req);
+long              nlmclnt_block(struct nlm_rqst *req, long timeout);
 int               nlmclnt_cancel(struct nlm_host *, struct file_lock *);
 u32               nlmclnt_grant(struct nlm_lock *);
 void              nlmclnt_recovery(struct nlm_host *, u32);